Water Ring Vacuum Pump of Vacuum Adjustment

There are many kinds of manufacturers using water ring vacuum pump, many people have learned its intelligence and advanced. In actual operation, we sometimes need to adjust the vacuum degree to use. If the vacuum degree is not well controlled, it may affect many production links and bring many problems to the specific operation. So how can we operate correctly?

1. When many users use water-ring vacuum pump, the water-ring vacuum pump itself has no function to regulate the vacuum degree. Usually users will use the way of adding valves to regulate the vacuum degree of water-ring vacuum pump. We can install a precise relief valve at the pumping end of water-ring vacuum pump. When the vacuum degree of water-ring vacuum pump is high, open the valve. The space came down.

2. With the intellectualization of information, many users choose to use the intelligent water-ring vacuum pump. On the water-ring vacuum pump equipment, there are buttons on the user's top, which can set the negative pressure, and the LCD panel displays the negative pressure. How to control different water-ring vacuum pumps and choose more suitable water-ring vacuum pumps can be consulted by relevant technical personnel.

Water ring vacuum pump can be seen in all walks of life, and has its application in chemical industry, food industry and so on. It is a common gas pump, which plays an important role in the specific production. In the aspect of vacuum regulation, it needs professionals to operate and use, we must first learn for a period of time, master its relevant operational knowledge before starting to use.

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CCQ-Series-Pneumatic-Ultra-high-Vacuum-Gate-Valve

Huge-Ultra-high-Vacuum-Gate-Valves

Small Vacuum Pump of Selection

Small vacuum pump is also known as micro vacuum pump, because of its small size, so it is called small vacuum pump in the industry. It can not only achieve gas suction, but also achieve the effect of pressurization. With the increasing demand for small vacuum pumps in the whole market, the selection of small vacuum pumps has become a must for businessmen. In general, what are the precautions for the selection of small vacuum pumps?

Notices for Selection of Small Vacuum Pumps

1. Medium temperature of small vacuum pump.

According to the temperature of the medium gas passing through the pump, choose the ordinary type or the high temperature type.

2. Electromagnetic interference of small vacuum pump.

If there is a precise circuit to control the micro-pump, depending on the anti-interference ability of the circuit, it may be necessary to order a micro-pump with low electromagnetic interference.

3. Reliability of small vacuum pumps.

According to the severity of the consequences of the failure of small vacuum pumps, it is entirely in accordance with their own requirements. The average trouble-free continuous running time of high-quality products is more than 1000 hours, some as high as thousands of hours. Special attention is paid to the fact that this parameter is measured under full load and uninterrupted operation, which is the worst working condition. If the actual operation is not full load or continuous operation, the value will be higher, depending on the working condition of the pump.

4. Start-up with load.

If a small vacuum pump has a vacuum in its suction port or a pressure in its exhaust port before starting, another technical parameter of the pump should be considered: Pis value of the maximum start-up load at the intake port and Pos value of the maximum start-up load at the exhaust port. Typical application example is the use of micro air pump to maintain the vacuum or positive pressure in the container. When the vacuum or positive pressure in the container is lower than the set value, the pump needs to be energized to start and stop when it is higher than the set value.

If the user of small vacuum pump can make a correct judgment when choosing the product, I believe it will certainly provide great help for the future work and production. In recent years, China's economy and science and technology have made significant progress, I believe this will certainly provide a solid foundation for the development of small vacuum pumps. For the use of products, whether the original purpose can be achieved requires not only the good value of products, but also the wisdom of users.

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CCD-Series-Electric-Ultra-High-Vacuum-Screw-Gate-Valve

CCQ-pneumatic-series-ultra-high-vacuum-flapper-valve

Rotary vane vacuum pump of Laboratory

Rotary vane vacuum pump is based on the original 2XZ series, which is adapted from foreign advanced technology and experience. When the inlet pressure is less than 1.33*1000Pa, the rotary vane vacuum pump can still operate continuously. It is used to extract the gas from the sealed container and make the container vacuum. It can also be used as the front pump of various high vacuum and ultra-high vacuum equipment.

Rotary vane vacuum pump is widely used in laboratories and laboratories of vacuum metallurgy, vacuum coating, solar polycrystalline silicon, monocrystalline silicon, distillation, food packaging, aviation science and technology, semiconductor, electronics, refrigeration, medical, chemical and other industries, colleges and institutes.

Rotary vane vacuum pump advantages:

1. Small size, light weight and low noise.

2. An air ballast valve is provided to remove a small amount of water vapor.

3. High vacuum limit.

4. Built-in forced oil pump, full lubrication, reliable performance.

5. It is equipped with automatic anti-return oil check valve and double safety device, which makes it easy to start.

6. When the intake pressure is less than 1.33*1000Pa, it can still operate continuously.

7. No oil leakage, no oil distribution, no pollution to the working environment.

8. It can be equipped with small caliber conversion interface and KF interface.

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Water ring vacuum pump operates correctly

After purchasing the water ring vacuum pump, we usually look at the operation process before using it, so as to avoid problems caused by improper operation during use. Let's take a look at the operation of the device.

First, prepare

1. The hand-cranked coupling pump should be able to rotate flexibly without jamming.

2. Jog the liquid ring vacuum pump to check whether the steering of the motor is consistent with the steering of the pump. Also check if the pump is running normally or not.

Second, start

1. Close the intake valve of the water ring vacuum pump, open the inflation valve, and open the liquid ring vacuum pump exhaust valve.

2. Close the power supply and turn on the liquid ring vacuum pump.

3. After the liquid ring vacuum pump runs smoothly, open the liquid ring vacuum pump water supply valve to supply water, and the ceramic pump should also open the machine to seal the water.

4. Slowly open the intake valve to allow the pump to start pumping.

5. Adjust the water supply of the pump to balance the vacuum with the process value.

Third, stop the pump

1. Close the intake valve of the water ring vacuum pump.

2. Close the water supply valve of the vacuum pump.

3. Turn off the power and turn off the pump exhaust valve.

4. Close the liquid ring vacuum pump inflation valve.

Before operating the water ring vacuum pump, it is necessary to understand the correct operation process in order to avoid accidents caused by improper operation during use. This is also an expression of responsibility for work and for itself.

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liquid ring vacuum pump of Cleaning

The liquid ring vacuum pump will produce some stains after using for a period of time. At this time, it needs to be cleaned to ensure its cleanliness. What can we do to achieve the best cleaning effect in the cleaning process? Let's know the cleaning method first.

1. The liquid ring vacuum pump cleans the foreign matter gathered in the pump chamber every month, such as opening the valve in the discharge pipeline in a short time or opening the blockage of the discharge wire in a short time.

2. If there is excessive scale accumulation in the work of the liquid ring vacuum pump, then the liquid ring vacuum pump should be rinsed once every certain time (usually 5-10 days). The rinsing time should be first rinsed with a suitable solvent (10% oxalic acid, alcohol, etc.), and then rinsed with water.

3. All filters and filters installed on the pipeline must also be cleaned or replaced periodically (once a month).

4. The next cleaning cycle must be determined according to the scaling in the exhaust chamber of the liquid ring vacuum pump or the blockage of the filter in the pipeline during the first inspection.

5. When cleaning with compressed gas, you must wear personal protective equipment (such as goggles, masks, etc.) and discharge the exhaust gas through designated pipelines. When using chemical cleaning materials, attention must be paid to the warning and guidance in the relevant safety materials. Chemicals must be compatible with the materials used. Attention should be paid to the possibility that chemicals may corrode the parts in the pump.

Cleaning the liquid ring vacuum pump is not only to maintain its cleanliness. It is also because in the cleaning process can check whether there are any problems with the equipment, can be timely maintenance. This allows the equipment to work at its best.

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Electrically heated freeze dryer

Vacuum freeze dryer is widely used in medical, pharmaceutical, biological research, chemical and food fields. Items treated by freeze-drying are easy to be preserved for a long time, and can be restored to the pre-freeze-drying state and maintain the original biochemical characteristics after adding water. LGJ-12S freeze-dryer is a small vertical freeze-drying equipment. It has shelf heating and programmable functions. It is suitable for laboratory use or a small amount of production, and can meet the requirements of conventional freeze-drying in most laboratories.

Characteristics of technical parameters of freeze dryer:

1. Integral structure design, small size, no external flange, easy to use, no leakage.

2. All materials in contact with the product are inert materials to meet the requirements of GLP.

3. Cold trap and operating table are made of stainless steel, which is corrosion-resistant and easy to clean.

4. All stainless steel inflatable (drainage) valves designed and manufactured by our company are safe, anticorrosive and leak-free.

5. The cold trap has large opening, no inner coil, with sample pre-freezing function, and no cryogenic refrigerator is needed.

6. Specialized gas diversion technology, uniform cold trap ice capture, ice capture ability.

7. International well-known brand compressor, high efficiency and energy saving, long service life, low noise.

8. Well-known brand vacuum pump, high pumping speed, to achieve higher vacuum limit.

9. Vacuum pump protection function, can set the starting cold trap temperature of vacuum pump, protect the service life of vacuum pump.

10.7 inch real color industry embedded touch screen + SH-HPSC-II modular controller, high control accuracy, stable and reliable performance.

11. The specially designed FD-EMB control system can preserve hundreds of sets of technological formulas, each of which contains 50 temperature control sections, so as to improve the technological optimization rate.

12. Intelligent data recording system, real-time record and display cold trap temperature curve, sample temperature curve, vacuum curve, derived data can be browsed and printed by computer and a variety of operations.

13. Temperature control system of safety voltage (36V) for plate heating can control the heating rate.

14. Flexible manual + automatic control mode, manual groping process, automatic batch production.

15. Real-time alarm display and historical alarm inquiry function to facilitate fault diagnosis and equipment maintenance.

16. User level and password can be set, and operation management can be decentralized.

17. Powerful sensor calibration function to ensure long-term use of measurement accuracy.

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Vertical vacuum freeze dryer

Vacuum freeze dryer is widely used in medical, pharmaceutical, biological research, chemical and food fields. Items treated by freeze-drying are easy to be preserved for a long time, and can be restored to the pre-freeze-drying state and maintain the original biochemical characteristics after adding water. LGJ-12 freeze dryer is suitable for laboratory use or a small amount of production, and can meet the requirements of conventional freeze-drying in most laboratories.

Technical parameters characteristics of LGJ-12 freeze dryer:

1. Integral structure design, small size, no external flange, easy to use, no leakage.

2. All materials in contact with the product are inert materials to meet the requirements of GLP.

3. Cold trap and operating table are made of stainless steel, which is corrosion-resistant and easy to clean.

4. All stainless steel inflatable (drainage) valves designed and manufactured by our company are safe, anticorrosive and leak-free.

5. The cold trap has large opening, no inner coil, with sample pre-freezing function, and no cryogenic refrigerator is needed.

6. Specialized gas diversion technology, uniform cold trap ice capture, ice capture ability.

7. International well-known brand compressor, high efficiency and energy saving, long service life, low noise.

8. Well-known brand vacuum pump, high pumping speed, to achieve higher vacuum limit.

9. Vacuum pump protection function, can set the starting cold trap temperature of vacuum pump, protect the service life of vacuum pump.

10. Specialized design of FD-LAB lyophilizer control system + SH-HPSC-I modular controller, with high reliability and stability.

11. Intelligent data recording system, real-time record and display cold trap temperature curve, sample temperature curve, vacuum curve, derived data can be browsed and printed by computer and a variety of operations.

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Experimental vacuum freeze dryer

The experimental vacuum freeze dryer is widely used in the fields of medicine, pharmacy, biological research, chemical industry and food. Items treated by freeze-drying are easy to be preserved for a long time, and can be restored to the pre-freeze-drying state and maintain the original biochemical characteristics after adding water. LGJ-10 freeze dryer, suitable for laboratory use, can meet the requirements of most laboratories routine freeze-drying.

Technical parameters characteristics of experimental vacuum freeze dryer:

1. Integral structure design, small size, no external flange, easy to use, no leakage.

2. All materials in contact with the product are inert materials to meet the requirements of GLP.

3. Cold trap and operating table are made of stainless steel, which is corrosion-resistant and easy to clean.

4. All stainless steel inflatable (drainage) valves designed and manufactured by our company are safe, anticorrosive and leak-free.

5. The cold trap has large opening, no inner coil, with sample pre-freezing function, and no cryogenic refrigerator is needed.

6. Specialized gas diversion technology, uniform cold trap ice capture, ice capture ability.

7. International well-known brand compressor, high efficiency and energy saving, long service life, low noise.

8. Well-known brand vacuum pump, high pumping speed, to achieve higher vacuum limit.

9. Vacuum pump protection function, can set the starting cold trap temperature of vacuum pump, protect the service life of vacuum pump.

10. Specialized design of FD-LAB lyophilizer control system + SH-HPSC-I modular controller, with high reliability and stability.

11. Intelligent data recording system, real-time record and display cold trap temperature curve, sample temperature curve, vacuum curve, derived data can be browsed and printed by computer and a variety of operations.

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vacuum-freeze-drying-machine-for-food-laboratory

Skillful Ventilation Process of Liquid Ring Vacuum Pump

The process of reuse of liquid ring vacuum pump can not only speed up the transportation of liquid ring vacuum pump, but also extend its service life. Here we will reveal its ingenious ventilation process for you.

The liquid ring vacuum pump discharges air outwards to reduce the indoor air pressure, and the indoor air becomes thinner. The characteristics of the vacuum pump form a negative pressure zone. The air flows into the room due to the compensation of the air pressure difference. In the practical application of the industrial plant, it is centrally installed on one side of the plant, and the air inlet is on the other side of the plant. The air is convective blowing from the air inlet to the vacuum pump. In this process, it is close to the liquid. The doors and windows near the annular vacuum pump remain closed, forcing air to flow into the workshop by compensating the doors and windows on the side of the intake port. The air flows into the workshop in line and orderly from the intake port, flows through the workshop, and is discharged from the workshop. The ventilation is thorough and efficient, and the ventilation rate can be as high as 99%. Through the specific engineering design and the design of ventilation speed and wind speed according to the needs, any high-heat, harmful gases and dust smoke can be quickly discharged from the workshop. Any poor ventilation problem can be thoroughly solved once and for all, and can be reached within a few seconds from the opening of the station.

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Measures to Prevent Overload of Vacuum Pump

The power required to compress the gas in vacuum pump is proportional to the pressure difference. Once the pressure difference is too high, the pump may overload and cause motor winding burning. How to prevent the overload of vacuum pumps and preventive measures, the following is a brief introduction for you:

1. Adopt mechanical automatic pressure regulating bypass valve:

The bypass valve is installed in the bypass pipeline between its outlet and its inlet. The pressure difference between the inlet and outlet of this valve control pump does not exceed the rated value. When the pressure difference reaches the rated value, the valve opens automatically by the pressure difference function, which makes the outlet and the inlet of SK vacuum pump communicate, and makes the pressure difference between the inlet and outlet decrease rapidly. At this time, the vacuum pump works under almost no pressure difference load. When the pressure difference is lower than the rated value, the valve closes automatically and the gas is pumped out by the front pump through the vacuum pump. With bypass relief valve, it can start at the same time with the front pump, which makes the operation of the unit simple and convenient.

2. Use hydraulic coupling:

Hydraulic coupling can also prevent the overload of the pump, so that the pump can work under high pressure difference. The hydraulic coupling is installed between the pump and the motor. Under normal working conditions, the hydraulic coupling transmits rated torque from the motor end to the pump. The maximum pressure difference of vacuum pump is determined by the maximum torque transmitted by hydraulic coupling, and the maximum torque transmitted by hydraulic coupling is regulated by the amount of liquid in it. When the pump works under high pressure difference or starts at the same time with the front pump, the speed difference, i.e. sliding, occurs inside the liquid coupling, which only transmits a certain moment to slow down the pump. With the pumping process, the gas load decreases and gradually accelerates to the rated speed.

3. Vacuum electrical components are used to control the inlet pressure of the pump.

Vacuum diaphragm box relay or electric contact vacuum pressure gauge and other pressure sensitive elements are installed at the inlet pipeline of vacuum pump. After starting the vacuum system, when the pressure at the inlet of the vacuum pump is lower than the given value, the pressure sensitive element sends out a signal and opens the vacuum pump through the electrical control system. If the pressure at the inlet of the vacuum pump is higher than the specified value, the SK vacuum pump will be automatically closed, thus ensuring the reliable operation of the vacuum pump.

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vacuum pump of wear factor

SK vacuum pump wear is indispensable, then what is the cause of its wear, let's briefly analyze the causes of SK vacuum pump wear:

The wear of the journal surface of SK vacuum pump is not uniform. The radial wear of the main journal and the connecting rod journal is mainly elliptical, and their maximum wear parts correspond to each other, that is, the maximum wear parts of the main journal are close to the one side of the connecting rod journal, and the maximum wear parts of the connecting rod journal are also close to the one side of the main journal. The crankshaft journal also has taper wear along the axis. The elliptical wear of the journal is caused by the uneven distribution of forces acting on the journal along the circumference direction.

When the engine works, the comprehensive force acting on the connecting rod journal always acts on the inner side of the connecting rod journal, and the direction is outward along the crankshaft radius, which causes the greatest wear on the inner side of the connecting rod journal and forms an ellipse. The reason for conical wear of the connecting rod journal is that the oil passage leading to the connecting rod journal is inclined. When SK vacuum pump rotates, under the action of centrifugal force, the mechanical impurities in lubricating oil accumulate on one side of the connecting rod journal, which accelerates the wear of the side journal and makes the wear of the connecting rod journal conical.

In addition, the bending of the connecting rod and the non-perpendicularity of the cylinder center line to the SK vacuum pump center line will cause the uneven axial force on the journal and cause the wear deflection. The wear of the main journal is elliptical, mainly due to the centrifugal force of the connecting rod, the connecting rod journal and the crank arm, which makes the relative wear between the side near the connecting rod journal and the bearing larger. In addition, there may be abrasions and burns on the surface of the journal. The abrasion is mainly caused by the unclean oil, in which the larger hard mechanical impurities are scratched on the surface of the journal. The burns on the surface of journal are caused by burning bushes, which are mainly caused by insufficient lubrication, too thin oil and obstruction of oil circuit.

The wear factor of SK vacuum pump is what we should know. Only in this way can it be more convenient to use, which is also more conducive to our use.

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SK Vacuum Pumps Classification

It is believed that many customers are not very clear about the classification of SK vacuum pump, especially for those who choose SK vacuum pump, how to choose a suitable SK vacuum pump is very difficult. On-line search SK vacuum pump classification, there will be various types of pumps, but ultimately which is suitable for their own, customers are often unable to start. Today, I will give you a brief introduction to the SK vacuum pump category.

Generally speaking, SK vacuum pumps are divided into three categories: SK vacuum pumps with water, SK vacuum pumps with oil and SK vacuum pumps without oil.

1. SK vacuum pump for refueling is a rotary vane vacuum pump. The clearance between the rotary vane and the pump chamber is sealed by oil. The vacuum degree is much higher than that of water ring vacuum pump, but water vapor and corrosive gas can not be pumped.

2. Oil-free SK vacuum pumps are often used in clean environment, which will not pollute the products produced.

3. Water-added SK vacuum pump refers to water-ring vacuum pump, which uses water as working fluid and realizes suction, compression and exhaust by changing the volume of pump chamber, so as to achieve the purpose of vacuum extraction. This pump can extract gases containing water vapor and corrosiveness. Its types are cantilever water-ring vacuum pump, 2SK water-ring vacuum pump, SK water-ring vacuum pump, SZ water-ring vacuum pump, etc.

According to the introduction above, three different types of SK vacuum pumps have different working environments, so customers should have a good knowledge reserve and buy more suitable SK vacuum pumps when they choose and purchase.

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2BV Vacuum Pump in Chemical Industry

In many industries, because of the help of some machinery and equipment, our production can proceed more smoothly. In chemical industry, the use of machinery and equipment is even more important, because harmful substances often appear in this industry, which is also to maximize our safety. Among them, seemingly common equipment like 2BV vacuum pump can play an important role here. Use.

1. Gas Recovery in Petroleum Industry

In the petroleum and natural gas industry, where the gas is discharged into the atmosphere, gas recovery can be achieved by removing the vacuum and compressing the gas from the storage tank. By using the liquid ring pump, the gas can be recovered and liquefied, and then the ethane gas can be used. In this process, a vacuum pump is needed.

2. Gas recovery

Gas recovery can be described as gas recovery in refining sewage system or production. Once the gas is separated, it can be recovered and compressed from low pressure compressor to large pipeline compressor. The 2BV vacuum pump can compress the recovered gas to a great extent, compress it to power generation equipment for treatment, and can be used for combined power generation.

3. Vacuum distillation of crude oil

Gasoline and other hydrocarbon fuels can be produced by atmospheric distillation or vacuum distillation. This usage includes vacuum pump equipment for crude distillation column, combined effect of heat and vacuum, and separation of crude oil into different components according to different boiling points.

4. Exhaust Compression

The non-condensable light hydrocarbon gas discharged from crude oil distillation tower and other refining equipment is collected in ordinary vessels and burned out through pipeline or discharged to compressor. According to the required exhaust pressure, 2BV vacuum pump compresses the exhaust gas with certain combustion value and combusts it to recover energy. This process is usually very short, and this energy recovery is very important for environmental protection.

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Water ring vacuum pumps are sometimes used in coal industry

With the increasing emphasis on coal mine safety, higher requirements and standards will be put forward for water ring vacuum pumps used in coal mines. Efficient, fast and thorough is the main development direction of mine water ring vacuum pump. Next, we will learn about the application of water ring vacuum pump in coal industry, hoping to help you.

1. Coal refining

In the process of vacuum filtration of refined coal, it is generally required to withstand the impact of air flow and water. A water ring vacuum pump with a pre-separator is required to separate liquid under a steady pressure.

2. Dust removal

Coal mine dust is the main source of surface pollution due to its large amount and complex composition. With large water ring vacuum pump as the main pump, equipped with separation, dust removal, protection and other devices to achieve the recovery and utilization of dust in mining areas, also plays a role in purifying air.

3. Production of Antistatic Equipment

In the process of producing anti-static and flame-retardant conveyor belts and underground clothing, vacuum slurry immersion process is adopted to make anti-static and flame-retardant enter the conveyor belt, replacing the original spraying process, which is more safe and reliable.

4. Vacuum Pump Drying Cable

The insulation performance of mine cables can be easily reduced in damp mines for a long time. Using water ring vacuum pump as pumping equipment, the cables are heated by low voltage and high current, which can effectively prevent oxidation and prolong the aging process of cables under the condition of low oxygen concentration.

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Material Water Ring Vacuum Pump for Spacecraft

Space environment affects the performance and life of spacecraft. Many faults of spacecraft are directly and indirectly related to the space environment. Therefore, it is very important for the development of space technology to study the interaction between space environment and aerostat and take corresponding measures to reduce the impact of various factors. For the influence of space charged particles, various protective measures are mainly adopted. For the influence of space vacuum environment, the structure and functional materials used in spacecraft are mainly screened in terms of outgassing.

In spacecraft, metal materials are seldom eliminated because of outgassing index, while organic materials and composite materials with larger outgassing are widely used in spacecraft, so it is necessary to screen them.

The main indicators for screening materials in terms of gas emission are as follows:

1. Ectopic Testing Indicators for Material Outgassing Screening

Total mass loss (TML). It is expressed by the percentage of the mass difference of the sample before and after the test to the initial mass of the sample. Total mass loss includes not only the mass loss of material itself, but also the mass loss caused by material deflation, which reflects the degree of material performance change.

(2) Condensable volatiles (CVCM) collected. The quality difference of the collection plate before and after the test is expressed as a percentage of the initial mass of the sample. Some of the mass lost in the vacuum environment may re-condense on the cooler surface, possibly polluting the sensitive surface of the spacecraft. The collected condensable volatile index mainly reflects the amount of condensation on the condensation surface, and also reflects the degree of contamination on the sensitive surface caused by the material escape. (3) Water vapor recovery (WVR). The difference between the mass of the sample just exposed in a thermal vacuum and that of the sample after being re-exposed at 50% humidity for 24 hours is expressed as a percentage of the initial mass of the sample. This index mainly reflects the material's ability to absorb water vapor. Because water vapor is very harmful to optical devices, especially infrared optical devices, it is very meaningful for the choice of optical materials to be non-condensable.

2. In-situ test index of material outgassing screening

In order to predict the mass loss of long-life spacecraft during the whole life period, it is necessary to understand the mass loss and the variation of condensable volatiles with time, and to analyze their variation rules. Therefore, it is impossible to predict directly by TML, CVCM and WVR. In-situ measurement of mass loss and condensable volatiles in vacuum must be realized. The in-situ test indexes of material outgassing screening are as follows:

(1) The change of mass loss percentage (MLR) with time. That is to say, the cumulative loss of quality in the test time accounts for the percentage of the initial quality, in units of.

(2) Evolution rate of condensable volatile with time (VCMER). That is to say, the mass of the condensed volatiles accumulated and escaped during the test time is the percentage of the initial mass, in units of 1%.

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Vacuum pump in vacuum drying

Vacuum pumps are widely used in vacuum drying process. The so-called vacuum drying is a kind of drying method, in which the material is placed under negative pressure and the boiling point under negative pressure is appropriately reached by heating or the material is dried through the melting point after solidification by cooling. The boiling point of water in the material under negative pressure decreases with the increase of vacuum. At the same time, vacuum pump clearance dehumidification is used to reduce water vapor content, which makes the solution such as water in the material get enough kinetic energy to separate from the material surface. Vacuum drying, because of the isolation of air under negative pressure, makes some materials which are easy to oxidize and other chemical changes in the drying process better maintain their original characteristics. It can also better protect materials by injecting inert gas and vacuum. Common vacuum drying equipment are: vacuum drying box, continuous vacuum drying equipment, etc.

The process of vacuum drying is to place the drying material in a sealed drying chamber and heat the drying material continuously while vacuuming with a vacuum system, so that the moisture in the material can diffuse to the surface through pressure difference or concentration difference. The water molecule can obtain enough kinetic energy on the surface of the material and escape to the low-pressure space of the vacuum chamber after overcoming the mutual attraction between the molecules. The process of empty pumping.

In the vacuum drying process, the pressure in the drying chamber is always lower than the atmospheric pressure, the number of gas molecules is small, the density is low, the oxygen content is low, so it can dry materials which are easy to oxidize and deteriorate, inflammable and explosive dangerous goods, etc. It can play a certain role in disinfection and sterilization of drugs, food and biological products. It can reduce the chance of material contamination or inhibit the growth of some bacteria.

Because the temperature of water is proportional to the vapor pressure in the process of vaporization, the moisture in the material can vaporize at low temperature during vacuum drying, which can realize low temperature drying. This is beneficial to the drying of thermosensitive materials in some medicines, food and agricultural by-products.

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Water Ring Vacuum Pumps Classification

Water ring vacuum pumps are classified according to suction and exhaust States

1) liquid ring pump. The inlet of the pump is in vacuum and the outlet is in atmospheric pressure. It is mainly used for vacuum water diversion (deacidification, degassing), vacuum moisture regain, etc. The limit vacuum of single stage pump is less than 50 hPa, and that of two stage pump is less than 39 hPa.

2) liquid ring compressor. The inlet of the pump is in the atmospheric pressure state, and the outlet is in the pressure state of the liquid ring pump. Mainly used in the chemical industry hydrogen, chlorine, vinyl chloride and other media pressure. The discharge pressure of single-stage pump can reach 0.3 MPa and that of two-stage pump can reach 0.6 MPa. Compressors with two or more stages are complex in structure, and the improvement of compression capacity is not proportional to the series number, so they are generally not used.

At present, the market also needs a kind of liquid ring pump between vacuum pump and compressor, that is, the inlet is in vacuum state, the outlet is in pressure state, and the working pressure is generally less than 500 hPa. We temporarily call it liquid ring vacuum-compression pump. It is often used for gas drainage in underground coal mine and reverse furnace gas.

Water ring vacuum pumps are classified according to the direction of suction and exhaust

1) Axial suction and exhaust gases enter and discharge impellers along the axis through the suction and exhaust windows on the side distribution plate.

The suction and exhaust windows are arranged on the distribution plate plane on the side of the impeller. The exhaust windows can be adjusted to minimize the over-compression in the low vacuum region and the under-compression in the high vacuum region. The power curve is non-overloaded and the high efficiency region is widened. In the trial production process, the window size and angle can be easily changed to achieve the best efficiency. In addition, the structure of this method is simple and easy to be made into two-stage pumps, but due to the limitation of window area, it is not suitable to be made into a double-acting type.

2) Radial suction and exhaust

Gas enters and discharges the impeller radially from the suction and exhaust windows on the surface of the distributor installed in the impeller wheel. This method can be used in both single and double-acting modes, especially in double-acting mode, because of the large window area, the efficiency is much higher than that of the axial mode. However, the structure of the pump is complex and difficult to manufacture. The size of the window can not be adjusted, and it is not easy to make a two-stage pump.

How-to-Select-Water-Ring-Vacuum-Pump

Vacuum-Pump-in-Plastic-Absorbing-Machine

Single-stage-rotary-vane-pump-and-double-stage-rotary-vane-pump

Vacuum isolation valve

Installation and Maintenance of Vacuum Isolation Valve

Do you know how to install and maintain vacuum isolation valves? Now let's get to know it together.

Installation and use steps:

1. Before installation, check the valve chamber and sealing surface, and no dirt or sand is allowed to adhere.

2. Bolts in each connecting part should be tightened evenly.

3. Checking the filler position requires compaction, which not only ensures the sealing of the filler, but also ensures the flexible opening of the gate.

4. Before installing the valve, the user must check the valve type, connection size and media flow direction to ensure consistency with the valve requirements.

5. When installing the valve, the user must reserve the necessary space for the valve drive.

6. The wiring of the driving device shall be carried out according to the circuit diagram.

7. Gate valves must be maintained regularly. No collision or extrusion is allowed, so as not to affect the sealing.

Notes:

1. Handwheels, handles and transmission mechanisms are not allowed to be lifted and collisions are strictly prohibited.

2. Double gate valves should be installed vertically (i.e. the stem is in the vertical position and the handwheel is at the top).

3. Gate valves with bypass valves should be opened before opening (in order to balance the pressure difference between inlet and outlet and reduce the opening force). Gate valves with belt drive mechanism shall be installed in accordance with the specifications of the product.

4. Lubricate the valve at least once a month if it is frequently switched on and off.

KF-Full-Nipple

KF-Reducing-Conical

KF-Elbow

KF-Tee

imported vacuum pump filter element

The filter element of the imported vacuum pump is the filter equipment in the vacuum pump and an important working part of the filter. The filtering effect is mainly determined by the performance of the filter element. So how to maintain and maintain the filter element of imported vacuum pump?

First, there are three main types of filtration in the operation of imported vacuum pumps:

1. Intake filter element: It can effectively prevent solid particles and fine ash from being sucked into vacuum pump. Reduce mechanical wear and improve operational reliability. While prolonging the service life of the pump, it can also effectively protect the system components.

2. Exhaust filter element: Considering exhaust resistance, dust capacity and oil-gas separation performance, the three requirements achieve the optimal balance. Different internal and external locations need different materials to achieve different separation purposes.

3. Oil filter element: Lubricant filter for imported vacuum pump, mainstream filter for prolonging the service life of oil, installed in the oil circuit.

2. Use and maintenance of filter element of imported vacuum pump:

1. Release the knob bolt to separate the filter housing from the head. Be careful not to lose rubber and fibre gaskets.

2. Carefully remove the spring and felt gasket, and then remove the paper core.

3. Clean the dust and foreign matter in the fold of the filter core with a brush, then gently pat it flat with your hand to make the remaining dust fall, wipe off the dust on the inner wall of the shell and the dust on the fibre mat.

4. Loading the cleaned or new filter core back in reverse order when disassembling.

KF-Bored-Weld-Flang

KF-Sockent-Weld-Flange

KF-Half-Nipple

Vacuum pump cylinder

Inspection Method of Vacuum Pump Cylinder

1. Measure the roundness and cylindricity of the cylinder of the water ring vacuum pump, and determine the boring cylinder or replacement according to its wear degree.

2. Cylindricity and cylindricity of cylinder should comply with relevant regulations.

3. There should be no cracks, sand holes, scars, grooves and other defects on the inner surface of the cylinder. The surface roughness is 1.6.

4. Cracks or leakage are not allowed in cylinder water jacket.

5. The cylinder diameter of the hammer water ring vacuum pump should not increase more than 2% of the original size, and the cylinder wall should not be thinner than 1/12 of the original thickness.

Correct maintenance of the cylinder of the water ring vacuum pump will be more conducive to the use of the pump, but also to extend its life. At the same time, when inspecting the cylinder of vacuum pump, we should pay attention to all aspects, such as surface, diameter, etc., which need to be inspected.

Water ring vacuum pump is a kind of coarse vacuum pump. The maximum vacuum it can obtain is 2000-4000Pa. The vacuum degree of the unit composed of water ring vacuum pump and vacuum pump can reach 1-600Pa. Water ring pump can also be used as a compressor, known as water ring compressor, is a low-pressure compressor, its pressure range is 1-2*105Pa gauge pressure. Any machine will have some minor faults after a long time of use, so it is necessary to master some solutions.

KF-Blank-Flange

KF-Clamp

KF-Centering-Ring-with-O-ring

rotary vane vacuum pump development course

Rotary vane vacuum pump station is a kind of varactor mechanical vacuum pump, which utilizes the rotating motion of the rotor and the vane sliding in the rotor slot to obtain vacuum. When the working fluid is used to lubricate and fill the dead gap of the pump chamber, separating the exhaust valve from the atmosphere, it is commonly known as the oil-sealed rotary vane vacuum pump. When there is no working fluid, it is a dry rotary vane vacuum pump.

In oil-sealed rotary vane vacuum pump, the belt-driven rotary vane vacuum pump is customarily called in China, while the direct-coupled rotary vane vacuum pump is directly connected with the motor or with the coupling. In each pump, there are single-stage and double-stage. In single-stage pumps, the limit pressure and usage of pumps are different due to the different structure and parameters.

Their common characteristics are simple structure, easy use, starting from atmospheric pressure, direct discharge of the atmosphere, small eccentric mass, simple maintenance, the limit pressure of two-stage pump is 6 *10-2~l *10-2 Pa, one single-stage pump can reach about 4 Pa, the other single-stage pump is about 50-200 Pa.

Dual-stage rotary vane vacuum pump station can be widely used in refrigerators, air conditioners, light bulbs, fluorescent lamps, bottle gall production and electronics, metallurgy, medicine, chemical industry, oil filter, printing machinery, packaging machine and other industries. It can be used as the front-stage pump of diffusion pump, Roots pump, molecular pump, etc., to supply electronic instruments, medical instruments and other supporting and experimental research applications. Because direct pump has no dust pollution caused by belt friction, its volume is small, weight is light, material is saved, function is improved day by day, and it is more widely used.

Rotary-vacuum-pump-of-vacuum-filtration

Vacuum-pump-vacuum-degasser

Water-Ring-Vacuum-Pump-in-Pneumatic-Conveying-System

Vacuum-Pump-Degassing-Equipment-in-Steel-Vacuum

Roots Liquid Ring Vacuum Unit Working Principle

It is more advantageous for Roots liquid-ring vacuum unit to choose liquid-ring vacuum pump as the front pump than other vacuum pumps. It overcomes the limitation pressure difference of single liquid-ring vacuum pump (the unit's limitation pressure is much higher than that of water-ring pump), and has the disadvantage of low pumping rate under a certain pressure. At the same time, it retains the advantages of Roots pump that can work quickly and has a larger pumping rate. Especially, it can suit to extract a large amount of condensable steam, especially when the capacity of gas-ballast oil-seal mechanical vacuum pump to remove condensable steam is not enough, or the solvent used can deteriorate the performance of the pump oil, or when the vacuum system does not allow oil pollution. When equipped with explosion-proof motors and electrical appliances and in compliance with the corresponding safety rules, flammable and explosive gases can also be removed. Therefore, Roots pump-liquid ring vacuum pump unit is widely used in vacuum distillation, vacuum evaporation, dehydration and crystallization in chemical industry; freeze-drying in food industry; vacuum drying in pharmaceutical industry; polyester chips in light textile industry; high-altitude simulation test and other vacuum pumping systems.

Roots vacuum pump (mechanical booster pump) used in higher vacuum can not directly discharge the atmosphere. For example, the pressure difference between the suction and exhaust ports of Roots vacuum pump will be too large, which will overload the Roots vacuum pump. If the motor power of Roots vacuum pump is simply increased, the tiny gap between the rotors of Roots vacuum pump will be overheated and soon become stuck due to thermal expansion. The clearance between the rotors of Roots vacuum pump must be guaranteed in order to ensure that Roots vacuum pump can reach a higher vacuum. Therefore, the Roots vacuum pump must be equipped with a front-stage pump when it is used. When the pressure in the system is pumped to a certain range by the front-stage pump, the Roots vacuum pump can be started again, so that the overload of the Roots vacuum pump can be avoided. Front-stage pumps can choose water (liquid) ring vacuum pump, rotary vane vacuum pump, slide valve vacuum pump, reciprocating vacuum pump and other vacuum pumps that can directly discharge the atmosphere.

In general, it is more advantageous for Roots vacuum unit to choose liquid ring vacuum pump as the front pump than other vacuum pumps, mainly because it can extract a large amount of condensable vapor, especially when the mechanical vacuum pump of gas-ballast oil seal has insufficient capacity to remove condensable vapor, or the solvent used can deteriorate the performance of the pump oil, or when the vacuum system does not allow oil pollution. For obvious.

Vacuum-System-Fine-Chemical

2BV-Vacuum-Pump-Price

SK-Liquid-Ring-Vacuum-Pump-Hydraulic-System

Roots-Vacuum-Pump-in-Medicine

SK LIQUID RING VACUUM PUMP SEPARATION PROCESS

SK liquid ring vacuum pump is a complete system with two water ring vacuum pumps as vacuum acquisition equipment and vacuum tank as vacuum storage equipment. Compared with the separation process of SK liquid ring vacuum pump, we still don't know. Today we will introduce this problem to you.

1. Mixing and accelerating stages. Slag-containing wastewater and flocculant are mixed in the feeding chamber and accelerated to ensure that the slag-containing wastewater enters the separation zone in the best state.

2. Clarification stage. Under the action of centrifugal force, flocculant particles quickly separate and settle in the straight section of the drum. The separated supernatant is discharged through the weir at the end of the drum.

3. Compression stage. The sludge is further compressed by centrifugal force and pore water is released when the settling solid is pushed to the discharging end by the screw propeller.

4. Two-way extrusion stage. In the conical section of the drum, wastewater sludge is subjected to biaxial extrusion. The screw conveyor is properly designed to produce extrusion force along the axial direction. With the compression of centrifuge, the capillary water of sludge is further extruded.

5. Solid residence time, when the amount of sludge and mud entering SK liquid ring vacuum pump changes, in order to maintain the best dewatering effect, the total solid content in the centrifuge drum is continuously controlled. SK liquid ring vacuum pump has good effect, and the water content of sludge is about 70%.

vacuum-pump-for-cnc-machine

liquid-ring-vacuum-pump-in-ceramic-vacuum-filter

Liquid-Ring-Vacuum-Pump-Application-Advantage

Liquid-Ring-Vacuum-Pump-and-Liquid-Ring-Compressor-Working-Principle

How to choose high quality dry screw vacuum pump?

Dry screw vacuum pump is a high-tech product, which is mainly used in high-purity vacuum process. It has high vacuum degree, can adapt to harsh conditions, has the ability to extract condensation and particulate gas, is especially suitable for clean environment, and is easy to do anti-corrosion treatment. It is especially suitable for electronic, chemical, biomedical, metal processing, food processing and other fields. Dry screw pump is a new type of vacuum pump. It is a renewal product of traditional vacuum pump. Because of its unique design principle, it can be oil-free and water-free. It can be used as corrosion-resistant coating. Excellent sealing design, besides the slightly more expensive price, will far exceed the performance of traditional vacuum pump in any aspect. It will have great market prospects in the future.

We can choose and judge the high quality dry screw vacuum pump through the following points:

1. Ultimate Vacuum: Of course, the lower the Ultimate Vacuum, the better. At present, domestic products are generally about 5 Pa, while imports are about 1 Pa.

2. Vibration and noise: Vibration must be small and noise must be 80 decibels small.

3. If it is used in corrosive environment, it is better to ask the manufacturer for a sample of the same coating and take it to the factory to test in the medium solution. Each manufacturer uses a different coating or coating ratio, and its performance will of course be quite different.

4. Sealability: This is also very important, but only from the manufacturer's recommendation to understand, the most direct or after access to the system through media testing is whether there is leakage.

The first two points determine the level of processing and design technology of vacuum pumps, which will affect the service life of pumps. The last two points will affect the service life of pumps, but also need experimental proof.

In order to purchase high-quality vacuum pumps, we should fully understand and prepare before purchase, so as to purchase suitable and satisfactory products. Because of the high cost of screw pump in general, it is suggested that we should choose more imported products when purchasing.

Oil-free-Vacuum-Pump-Application

What-is-a-dry-vacuum-pump

Liquid-Ring-Vacuum-Pump-in-Special-Ceramic-Manufacturing-Industry

How to choose the front pump of Roots vacuum pump?

Everyone knows that Roots vacuum pump can not be used alone, it must be equipped with a front-stage pump to form a pump unit. The use of the front-stage vacuum pump is to reduce the discharge pressure of Roots vacuum pump. Because the compression ratio of Roots vacuum pump is limited, it is very important to choose the speed of the front-stage vacuum pump. The maximum compression ratio of Roots vacuum pump varies with the discharge pressure. Under high discharge pressure, the maximum compression ratio is 3:1, and the maximum compression ratio is between 1 and 10 mbar (1 mbar = 0.75 Torr), which can reach 50:1, or even higher. Therefore, the selection of pumping speed of the front stage pump should be considered according to the long-term working pressure range of Roots vacuum pump.

For example, there is a system with Roots vacuum pump unit for pumping, which requires 600 litres/sec pumping speed at 1 mbar inlet pressure, and long-term operation. How much pumping speed should be selected for the front stage pump?

In addition, we should consider the requirement of pre-pumping time, if the normal working time is much longer than pre-pumping time, we can choose smaller pre-pumps; if the vacuum chamber is large and requires pre-pumping quickly, we need to use larger pre-pumps. Sometimes in order to better play the efficiency of equipment, the unit has larger pre-pumps, which are stopped after normal work, and maintained by smaller pre-pumps. This is done to save power.

The limit pressure requirement of Roots vacuum pump unit must also be considered when choosing the front stage pump. The high limit vacuum (up to 1 X10-3 PA to 1 X10-2 Pa pressure) usually uses two-stage rotary vane pump or two-stage sliding valve mechanical pump as the front stage pump. The limit vacuum degree requires that single stage oil rotary vane pump be selected as the front stage pump between (1X10-2 Pa~1X10-1 Pa), and reciprocating vacuum pump or water ring vacuum pump be selected as the front stage pump between 133 and 1333 Pa.

When the reciprocating or water-ring rough vacuum pump is selected as the front pump of Roots vacuum pump, the speed of the front pump is generally 1/2-1/4 of that of Roots vacuum pump, which can not be too large. Otherwise, the compression ratio will be too large, which will cause the exhaust temperature of Roots vacuum pump to be high and can not work properly.

When choosing the front-stage pump, it is also necessary to consider whether there is corrosive medium in the pumped gas and whether there is condensable gas, which is large or small. If there are corrosive gases, oil-seal mechanical pumps can not be selected. Oil-seal mechanical pumps are not suitable for extracting gases containing a large amount of condensable steam. Otherwise, the sealing fluid will be quickly emulsified. When extracting gases containing trace condensable steam, oil-seal mechanical pumps with gas-holder devices must also be used as front-stage pumps.

In order to obtain high pumping rate at low inlet pressure (1-100 pa), a Roots vacuum pump can be used as the first stage pump of another Roots vacuum pump to form a three-stage or four-stage unit. At this time, the pumping speed ratio between Roots vacuum pumps is generally between 2-5. German imported water-ring vacuum pump can also be used as the front pump of Roots vacuum pump. The imported water-ring vacuum pump can be used as the front pump with high efficiency. The combination of water-ring vacuum pump and Roots vacuum pump can achieve the best efficiency.

How-to-Choose-Vacuum-Pump

Claw-Dry-Vacuum-Pump-Application

How-to-Solve-Overload-of-Roots-Vacuum-Pump

How-to-Solve-the-Bearing-Heating-of-Vacuum-Pump

Matters needing attention in selecting liquid ring vacuum pump

The liquid ring vacuum pump is a multi-blade rotor eccentrically mounted in the pump housing. When it rotates, the liquid (usually water) is thrown into the pump shell and a liquid ring concentric with the pump shell is formed. The liquid ring and the rotor blade form a rotary variable volume vacuum pump with periodic variation. Water ring vacuum pump is the most common type of liquid ring vacuum pump. This kind of water ring vacuum pump is mainly used in the process of rough vacuum and large pumping capacity. It has been widely used in chemical, petroleum and light industries. The advantages of this pump are: simple structure, easy manufacture, reliable operation, convenient use and durability. It can extract very large gases, including corrosive gases, dusty gases and gas-water mixtures.

What should be paid attention to in liquid ring vacuum pump?

1. Understand the composition of the extracted gas. The gas contains no condensable vapor, particulate dust and corrosiveness. When choosing a vacuum pump, it is necessary to know the gas composition and select the appropriate pump for the pumped gas. If the gas contains vapor, particles, and corrosive gases, it should be considered to install auxiliary equipment such as condenser, dust collector in the intake pipeline of the pump.

2. Choose the working point of the liquid ring vacuum pump correctly. Each pump has a certain working pressure range, such as: the working pressure range of LEM series water ring vacuum pump is 760 mmHg ~ 25 mmHg (absolute pressure). Within this wide pressure range, the pumping speed of the pump varies with the pressure (detailed changes refer to the performance curve of the pump), and its stable working pressure range is 760 ~ 60 mmHg. Therefore, the working point of the pump should be selected within this range, rather than allowing it to work for a long time under 25-30 mmHg.

3. How does the oil vapor discharged from the liquid ring vacuum pump affect the environment? If the environment is not allowed to be polluted, oil-free vacuum pumps can be selected, or oil vapor can be discharged outdoors. Whether the vibration generated during working has an impact on the process and environment. If the process is not allowed, vibration-free pumps should be selected or anti-vibration measures should be taken. Vacuum pump price, operation and maintenance costs.

4. Combine the liquid ring vacuum pump correctly. Because of selective pumping, sometimes a pump can not meet the requirements of pumping, and several pumps need to be combined to complement each other in order to meet the requirements of pumping. For example, the titanium sublimation pump has a high pumping speed for hydrogen, but can not pump helium, while the tripolar sputtering ion pump (or the bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon, the combination of the two will make the vacuum device get a better vacuum degree. In addition, some vacuum pumps can not work at atmospheric pressure, need pre-vacuum; some vacuum pumps outlet pressure is lower than atmospheric pressure, need the front pump, so they need to be combined to use.

5. Its working pressure should meet the requirement of the vacuum equipment's limit vacuum and working pressure. For example, a vacuum drying process requires a working vacuum of 10 mmHg, and the limit vacuum of the selected vacuum pump should be at least 2 mmHg, preferably up to 1 mmHg. Usually the limit vacuum of the pump is half to one order of magnitude higher than the working vacuum of the vacuum equipment.

6. Requirements of vacuum equipment for oil pollution. If the equipment is strictly oil-free, all kinds of oil-free pumps should be selected, such as water ring pump, molecular sieve adsorption pump, sputtering ion pump, cryopump, etc. If the requirements are not strict, you can choose to have oil pumps, plus some anti-oil pollution measures, such as adding cold traps, baffles, oil traps, etc., can also meet the requirements of clean vacuum.

Liquid-ring-vacuum-pump-external-drainage-recycling-device

Vacuum-Pump-in-Chemical-Production

What-is-the-exhaust-pressure-of-vacuum-pump

Vacuum System in Chongqing Iron and Steel Industry

In order to further improve product structure and steel quality in Chongqing Iron and Steel Industry, vacuum equipment technology is introduced. It is found that the vacuum system is greatly restricted by vapor from the current situation of domestic and foreign use. At the same time, in order to comply with the concept of environmental protection and efficient recovery and utilization of Chongqing Iron and Steel Industry, the vacuum system is chosen. When the limit pressure of the vacuum system reaches 67 Pa, the maximum pumping capacity can reach 800 kg/h, and the pressure in the vacuum tank can reach 67 Pa within 415 minutes of pumping time.

Vacuum system is used in the industry of Chongqing Iron and Steel Co., Ltd. Its metallurgical effect can reach or surpass the same technological target of multi-stage steam jet pump vacuum system. Its degassing rate is 63.5%, the ultimate decarbonization rate is 10@10-6, and T[O][30@10-6 in steel. Vacuum system is one of the necessary mechanical equipment of the elite equipment. Its extraction ability, extraction rate and other technological parameters directly affect the normal operation of RH and its metallurgical role. In the industry of Chongqing Iron and Steel Company, when the design of vacuum pump is 67Pa, the maximum pumping capacity is 800kg/h, which is basically the same as that of domestic steam pump with the same tonnage RH.


The vacuum system has the functions of degassing, decarbonization, temperature compensation, uniform temperature composition of molten steel and removal of inclusions in steel. It has been widely used in steelmaking because of its good refining effect and short treatment period.

XD-series-rotary-vane-vacuum-pump

2X-Series-Rotary-Vacuum-Pump

ZJP-Series-Roots-Vacuum-Pump

Reasons for Heating of Water Ring Vacuum Pump

1. The amount of circulating water is too little. There are two uses of circulating water. One is to cool the vacuum pump. The other is that water forms a water ring in the pump chamber when the impeller rotates. The air compresses the air in the water ring when the impeller rotates. 2. The temperature of the gas sucked by the vacuum pump is higher and the vacuum degree of circulating water is lower than 30 degrees. After running continuously for one day, the vacuum pump produces scale in the pump just like the kettle that boils water at home. When the impeller runs difficultly, the increase of friction causes the heat of the vacuum pump.

Exclusion methods:

1. The motor passport is dismantled. Whether the fan wings of the motor are flexible or not, there is no scale. When it is hard to operate, the exhaust pipe of the pump is dismantled and the scale inside is checked with the hand lamp. Scale will make the impeller difficult to operate, burn down the motor, and the spring of the mechanical seal will be easily locked on the shaft because of the scale. After the end surface is worn out, it can not be supplied automatically, resulting in leakage of the mechanical seal. Water burns down the motor.

2. Vacuum pump is a pumping pump, which permits a small amount of liquid. If the material sucked contains a large amount of water, buffer tank should be installed in front of the vacuum pump. If the vacuum pump sucks a large amount of water, it will break the impeller.

3. Vacuum pump sucks high gas temperature, using tap water as circulating water or using condenser to cool the gas. Attention: Vacuum pump must install overload protector to prevent overload burning motor. Connecting pipeline can not be thinned by 70%. Excessive thin pipeline and poor drainage can also cause overcurrent of motor.

ZJ-Series-Roots-Vacuum-Pumps

Diffusion-Pump-Vacuum-Unit

Water-Ring-Vacuum-Negative-Pressure-Station

2SK-Series-Two-stage-Water-Ring-Vacuum-Pump

Vacuum Pumps Types

If a container is placed in natural environment, if the gas pressure inside the container is not changed, the gas pressure inside and outside the container reaches equilibrium state, which is equal to atmospheric pressure numerically. In order to achieve a vacuum inside the container, the gas inside the container must be discharged, so that the pressure of the gas inside the container is less than the pressure of the external atmosphere. Using mechanical, physical, chemical or physical chemical methods, the equipment that obtains the vacuum from the gas discharged from the container is called the vacuum pump. Vacuum pumps can be classified into compression type (varistor type) and adsorption type according to their working principles. The working principle of the compressed vacuum pump is to compress the gas at the inlet end of the pump to the outlet end and discharge it out of the pump.

Common compression vacuum pumps are: rotating mechanical pumps using expansion-compression-discharge process, turbomolecular pumps using turbine blades to remove the body, etc. The working principle of the adsorption vacuum pump is to adsorb the gas in the pump body, which has achieved the goal of reducing the gas pressure. Common adsorptive vacuum pumps are: ion pumps using ionization suction, adsorption pumps using physical or chemical adsorption, suction pumps and cryogenic condensation pumps. The biggest difference between the adsorption vacuum pump and the compression vacuum pump is that the adsorption vacuum pump does not discharge the gas out of the pump, but stores it in the pump. The vacuum degree of the former is higher than that of the latter, but the pumping speed is smaller and the suitable container is smaller. Vacuum resistance furnace uses compressed vacuum pumps, such as mechanical pumps, Roots vacuum pumps and diffusion pumps.

Various types of vacuum pumps have their own working scope. Some pumps can work directly from the atmospheric state, such as mechanical pumps and adsorption pumps. Some pumps can not work directly from the atmospheric state, such as diffusion vacuum pumps, molecular pumps, ion pumps and so on. Only when the inlet vacuum reaches a certain value can they start to work.

oil-rotary/WX-series-oil-free-rotary-vane-vacuum-pump

2XZ-Series-Two-stage-High-Speed-Rotary-Vacuum-Pump

X-Series-Single-Stage-Rotary-Vacuum-Pump