Development and classification of imported vacuum pump oil

After many years of polishing, China's vacuum technology has made rapid development. At present, it has become an independent basic science with the continuous development of many industrial companies, such as aerospace science, vacuum coating, vacuum smelting, high energy physics, controlled thermonuclear reaction, surface research, etc. The progress of science and vacuum technology is interdependent. As a special lubricating oil for various mechanical vacuum pumps, the imported vacuum pump oil plays the functions of lubrication, sealing and cooling in the vacuum pump. 

Because the mechanical vacuum pump has different models, so the vacuum pump oil must also have suitable viscosity, excellent oil-water separation, good thermal stability and oxidation stability, as low as possible saturated vapor pressure, because the quality of vacuum pump oil indirectly affects the limit pressure, pumping rate, back pressure and oil return rate of vacuum pump equipment. In recent years, with the continuous development of vacuum technology, mechanical vacuum pump develops to high speed, low noise and miniaturization. The linear velocity of the friction pair surface in the pump cavity increases, and the oil temperature rises. Because the mechanical vacuum pump oil tends to be low viscosity, it is required to maintain a low vapor pressure under the working temperature of the pump.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Vacuum acquisition system

The instrument used to obtain vacuum is called vacuum pump. According to the working principle of the pump, vacuum pump can be divided into two categories. 

The working principle of this kind of pump is to use various inspiratory action to adsorb the gas and store it temporarily or permanently in the pump. Such as sublimation pump, sputtering ion pump, getter pump with sulfuric acid and phosphorus pentoxide to absorb water vapor, low temperature pump with cold trap to capture water vapor at low temperature.

The vacuum system is a closed system which is composed of vacuum pump, vacuum valve, vacuum gauge and other elements such as cold trap according to certain requirements. Two typical vacuum systems are used in freeze-drying. One is to absorb the water vapor sublimated (or evaporated) from the drying oven with P2O5 temperature absorbent, and then the oil diffusion pump is used to remove the water vapor leaked into the system or produced during drying The other is to use cold trap to capture water vapor, use oil seal rotary pump as the front stage pump, roots pump (mechanical booster pump) as the main pump to remove the non condensable gas leaked in or produced in the drying process. These two kinds of vacuum systems can ensure that the drying chamber is in the vacuum state required by freeze-drying.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Heat treatment industry of vacuum pump system

The so-called vacuum heat treatment is a heat treatment method that the workpiece is heated to the required temperature in 10-1 ~ 10-2Pa vacuum medium, and then cooled at different cooling rates in different medium. Vacuum heat treatment is called efficient, energy-saving and pollution-free clean heat treatment by the contemporary heat treatment industry.

The vacuum heat-treated parts have a series of advantages, such as no oxidation, no decarburization, degassing, degreasing, good surface quality, small deformation, high comprehensive mechanical properties, good reliability (good repeatability, stable life), etc.

Therefore, vacuum heat treatment has been widely valued and applied at home and abroad. The popularity of vacuum heat treatment is regarded as an important indicator to measure the level of heat treatment technology in a country. Vacuum heat treatment technology is a hot spot in the development of heat treatment technology in recent 40 years, and it is also an important field of advanced manufacturing technology.

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Two requirements for selecting water ring vacuum pump

What should be paid attention to when selecting the imported water ring vacuum pump. The type of imported water ring vacuum pump is mainly determined by the air volume, vacuum degree or exhaust pressure required for operation. When the pump works, the following two aspects should be paid attention to:

1. As far as possible, it is required to operate in the high efficiency area, that is, in the area of critical vacuum degree or critical exhaust pressure.

2. Operation near the maximum vacuum or exhaust pressure shall be avoided. In this area, not only the efficiency is very low, but also the work is very unstable, easy to produce vibration and noise. For the imported vacuum pump with high vacuum degree, cavitation often occurs when it operates in this area. The obvious sign of this phenomenon is that there is noise and vibration in the pump. Cavitation will cause damage to pump body, impeller and other parts, so that the pump can not work.

According to the above principles, when the vacuum degree or gas pressure required by the pump is not high, it can be selected in the single-stage pump preferentially. If the vacuum degree or exhaust pressure is high, the single-stage pump is often unable to meet the requirements, or the pump is required to have a large amount of air under a high vacuum degree, that is, the performance curve is required to be relatively flat under a high vacuum degree, so the two-stage pump can be selected. If the vacuum degree is required to be more than - 710mmhg, water ring atmospheric pump or water ring roots vacuum unit can be selected as the vacuum pumping device.

If it is only used for imported vacuum pump, it is better to choose single acting pump. Because the structure of single acting pump is simple, easy to manufacture and maintain, and it has good cavitation resistance under high vacuum. If it is only used for compressor with larger air volume, it is suitable to select double acting pump. Because of the large air volume, small volume and light weight of the double acting pump, the radial force can be automatically balanced, the shaft is not easy to produce fatigue fracture, and the service life of the pump is long.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

Dry Type Oilless Vacuum Pumps

Imported vortex pump

Vortex pump is also called vortex pump, regeneration pump, etc. It is called vortex pump because it sucks and discharges liquid by the action of vortex motion caused by the rotation of impeller. According to different types, vortex pump can be divided into single-stage vortex pump, centrifugal vortex pump, stainless steel vortex pump and other vortex pumps.

At present, the flow rate of general vortex pump is 0.2 ~ 27m3 / h. The working principle of general vortex pump when the prime mover drives the impeller in the pump to rotate through the shaft, the liquid enters the flow passage from the suction population, and is impacted by the centrifugal force of the rotating impeller, falling into the surrounding annular flow passage, so that the liquid rotates in the flow passage. Because every liquid particle is affected by centrifugal force, the liquid inside the impeller is more affected by centrifugal force, while the liquid inside the runner is less affected by centrifugal force. Because of the different magnitude of centrifugal force, the liquid makes longitudinal vortex motion. The liquid circulates through the passage between the blades many times in the passage by the longitudinal vortex. Every time the liquid passes through the passage between blades, the lift will be increased once, and finally the liquid will be squeezed out and discharged from El.

After the liquid is discharged, a local vacuum will be formed in the passage between the blades, and the liquid will continuously enter the impeller from the suction port, and repeat the above movement process. In this way, the vortex pump sucks the liquid at the same time and discharges the liquid at the same time, so as to work continuously. It can be seen from the working principle of general vortex pump that it is like the function of multi-stage centrifugal pump. Each blade passage is equivalent to one stage, and the energy increases once the liquid passes through the passage. Therefore, the head of general vortex pump is 2-5 times larger than that of centrifugal pump under the same impeller diameter, so it is a high head and small flow pump. Compared with the centrifugal pump with the same performance, the volute pump is smaller and lighter; compared with the volute pump with the same head, the volute pump has much smaller size and simpler structure. So the general vortex pump has the advantages of simple structure, compact, small volume, light weight and low cost

Water Ring Vacuum Pump

Dry Type Oilless Vacuum Pumps

Rotary Vane Vacuum Pump

How to choose roots vacuum unit

How to choose roots vacuum unit?

How to choose a good roots vacuum machine? What should we pay attention to? But to choose a Roots vacuum machine, you need to choose the right pressure, otherwise it will not work for the enterprise. Here is a small compilation to share the knowledge about roots vacuum machine for you.

It is very important to choose the speed ratio between roots pump and the front pump of roots pump vacuum unit. Because the compression ratio of Robo pump is very limited. This compression ratio determines the capacity of the previous pump, because the compression ratio is the inverse ratio of the pumping speed of the two pumps. Generally, the compression ratio is within 2-10. In addition, we should consider the requirements of pre pumping time. Vacuum equipment is used as auxiliary equipment in all kinds of mechanical equipment. If the normal working time is much longer than the pre pumping time, a smaller front stage pump can be selected (the compression ratio can be larger). If the vacuum is larger and it is required to pre pump quickly, a larger front stage pump will be used. Sometimes, in order to give full play to the efficiency of the equipment, a larger pre pumping pump is installed in front of the unit, which is stopped after normal operation, and maintained by a smaller pre pump, so as to save power. How to choose roots vacuum unit?

The requirements for the ultimate pressure of Roots vacuum pump unit are also necessary to be considered when selecting the front stage pump. The high requirements for the ultimate vacuum degree (up to 1 × 10-3 PA ~ 1 × 10-2 PA pressure) generally select the two-stage rotary vane oil seal mechanical pump or two-stage sliding Yan mechanical pump as the front stage pump. The mechanical pump with single-stage oil seal can be used as the front pump when the limit vacuum is between (1 × 10-2Pa ~ 1 × 10-1pa), and the reciprocating vacuum pump or liquid ring vacuum pump can be used as the front pump when the limit vacuum is between 133 ~ 1333pa.

Roots Vacuum Unit Specification And Precautions

Best Water Ring Vacuum Pump Operation And Maintenance

Water Ring Vacuum Pump System Type

How to select horizontal centrifugal pump

How to select horizontal centrifugal pump:

Centrifugal pump is designed according to the principle of centrifugal force. The high-speed rotating impeller blades drive the water to rotate and throw out the water, so as to achieve the purpose of transportation. There are many kinds of centrifugal pumps, which can be divided into civil and industrial pumps from the use; from the transmission medium, they can be divided into clean water pump, impurity pump, corrosion-resistant pump, etc.

How to choose centrifugal pump and vacuum pump?

I. high efficiency, low noise and energy-saving horizontal centrifugal pump shall be selected, and it is strictly prohibited to choose out products.

II. The voltage of the motor of the horizontal centrifugal pump shall be the same, and the power supply system shall be the same as that of the State Grid.

III. the pump shall be selected according to the design flow and the required head, and the pump output shall be reduced due to the abrasion of the pump. The pump can be selected by multiplying the calculated head h by the coefficient of 1.05-1.10; the characteristic curve shall be the pump whose head gradually decreases with the increase of the flow, so that the pump can work stably and reliably in parallel; and the operation point of the pump shall be kept in the high-efficiency section for operation OK, it's energy-saving and not easy to damage the parts.

IV. when there is no regulating facility in the water supply pipe network, it is advisable to use speed regulating pump group or rated speed pump group to run water supply. The maximum water output of the pump unit shall not be less than the design flow of water supply in the community, and shall be checked according to the fire fighting condition.

V. the number of lifting pumps for water tank and water tower shall be minimized, one for use and one for standby; when a single pump can meet the requirements, multiple parallel pumps shall not be used; if multiple parallel operation or matching mode of large and small pumps must be used, the model and number shall not be too many, the model number shall not be more than two generally, and the lift range of horizontal centrifugal pump shall be similar; each pump shall be parallel operation The pump should still operate in the high efficiency area.

Vi. the design water supply flow of the variable frequency speed regulating pump shall meet the requirements of the maximum design second flow in the domestic water supply system. The power supply shall be reliable; the working point of the water pump shall be selected in the efficient working area of the water pump characteristic curve, and shall not be selected on the extension line of the Q-H curve; the most unfavorable working point shall be designed at the right end of the efficient section of the water pump characteristic curve, that is, the point where the water output of the water pump is the largest and the lift is low, but it can meet the requirements, that is, the low point of the efficient section of the water pump characteristic curve and the pipeline characteristic curve The intersection of. The working range of water pump speed regulation shall be within the high efficiency section of water pump as far as possible; the speed regulation range shall be between 25% and 100% of water supply of water pump; the equipment shall have the function of automatic water level control.

VII. The pump unit of the domestic pressurized water supply system shall be equipped with a standby pump. The water supply capacity of the standby pump shall be greater than that of the largest operating water pump. The water pump shall be switched automatically and operated alternately.

VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

Heat treatment equipment

Roots Vacuum Pump Characteristics

The blower with forward exhaust can be used in series with the rotary vane pump to obtain higher pumping speed and lower limit pressure under medium vacuum than when the rotary vane pump is used alone. Roots pump, or Roots blower, consists of a pair of cocoon-shaped rotors mounted on two parallel rotating axles. The clearance between the rotor itself and between the rotor and the pump housing is typically about 0.2 mm. The two rotors rotate in reverse synchronization from 3000 rpm to 3500 rpm. Because the clearance between the rotor and the pump housing does not need oil seal, such speed is feasible.

The compression ratio of Roots pump, or the ratio of intake pressure to outlet pressure, is related to the pressure. Usually its maximum value is close to 100Pa. At higher pressure, the compression ratio of the pump is small, which is due to the increase of the flow conductivity in the sub-clearance with the increase of pressure. In theory, the compression ratio should remain unchanged at a lower pressure, but actually it decreases. The compression ratio at low pressure is lost due to the outgassing and the roughness of the rotor surface. Whenever the rotor faces the high pressure side, the surface of the rotor will absorb the gas, and when the rotor faces the high pressure side, a part of the adsorbed gas will be released. The maximum compression ratio is 44. The compression ratio of the large J pump is higher than that of the small pump, because the clearance of the large pump occupies less space than the volume of the pump. The compression ratio of light gases like nitrogen is 15-20% less than that of air. Compression ratio is a static quantity, which is obtained under the condition of zero flow rate. When measuring, the intake port of the pump is sealed and connected with a pressure gauge, the exhaust port is connected with a rough pump, and the whole system is pumped. Put the gas into the front pipe connecting the Roots pump and the rotary vane pump, measure the pressure P (front pressure) on the side of the outlet of the Roots pump, and measure the pressure P1 at the inlet. The compression ratio is derived from P/P1.

When the Roots pump is used to exhaust at high pressure, considerable heat will be generated, which will cause the expansion of the rotor and possibly damage the pump. In order to avoid overheating, the maximum pressure difference between the intake and exhaust ports of Roots pump is stipulated. The maximum pressure difference is generally 1000Pa, but if it exceeds this value in a short time, the pump will not be damaged. To avoid fever, Roots pump is connected by pressing compression pump or transmission pump.

In the common way of compressed exhaust, Roots pump and rotary vane pump are used in series. The rated pumping speed of rotary vane pump is 5 to 10 times lower than that of Roots pump. When pumping from atmospheric pressure, the bypass pipeline bypassing the Roots pump should be opened or the Roots pump should be idled. At this time, all the pumping action is carried out by mechanical pumps until the pressure of the front stage is lower than the recommended differential pressure of the manufacturer, then start the Roots pump and close the bypass valve. Some Roots pumps have this bypass characteristic on the pump body.

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Vacuum-Pump-in-Vacuum-Adsorption-Woodworking-Engraving-Machine

Vortex-Dry-Vacuum-Pump-Application

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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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

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Rotary Vane Vacuum Pumps

Rotary vane vacuum pump is a kind of oil seal rotary pump, also known as Gade pump, mainly composed of stator, rotor and slider. The rotor is eccentrically mounted in the stator and is tangent to the vertex of the stator inner wall. The rotor is equipped with two sliding vanes, which are tightly attached to the stator wall by the action of spring and centrifugal force during rotation. The stator is divided into suction chamber, storage chamber and exhaust chamber by the rotor and slider. As the rotor rotates and drives the slider, the suction chamber expands and sucks. The gas in the exhaust chamber is compressed gradually until the pressure exceeds the atmospheric pressure, the exhaust valve is opened and the gas is discharged into the atmosphere.dry-screw-vacuum-pump-application


In order to prevent the exhaust gas reflux pump, the exhaust valve is specially covered with oil and sealed. Vacuum pump oil not only lubricates the stator, rotor and slider, but also seals them. In addition, the pump oil fills all harmful spaces in the pump chamber, eliminating their influence on the limit vacuum.roots-vacuum-pump-in-crude-oil-distillation

The ordinary rotary vane vacuum pump is mostly used to extract pure dry gas. If the gas containing a large amount of condensate gas is extracted, the rotary vane gas town (valve) vacuum pump should be selected. An air ballast valve is installed in the "air storage chamber". It opens and inhales a certain amount of air. Its partial pressure is several times higher than that of water vapor in the air extraction chamber. When it reaches the exhaust chamber, the partial pressure of water vapor is still lower than that of saturated vapor. Therefore, it will not condense into liquid droplets, but keeps the gas and air together to discharge out of the pump.vacuum-system-in-spatial-simulation-chamber