Heating problem of screw vacuum pump

With the development of industry now, we should be very familiar with the screw vacuum pump, because its characteristics are widely used, in order to understand it better, let's understand the heating problem of screw vacuum pump together. 

Now the screw vacuum pump has excellent corrosion resistance. When using the screw vacuum pump, we will encounter the situation that the inner wall temperature of the reducer is very high two hours after starting. This situation is very unusual for machinery and equipment. Therefore, we should solve it immediately. If the temperature does not drop, please note that the oil window on the screw vacuum pump cannot be used with the plexiglass plate. Lift the low temperature cooler to the vacuum pumping position of screw vacuum pump, and apply cooling water of minus 10 degrees to reduce the temperature.

Screw vacuum pump manufacturers remind to reduce the temperature of working fluid in front of screw vacuum pump, measures should be taken to reduce the temperature, less than 20 degrees, in order to achieve better results.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Measurement of pumping rate of Roots vacuum pump

The constant pressure method is used to measure the pumping rate of Roots vacuum pump. The inlet of the pump is directly connected with the experimental cover, and the outlet of the pump is connected with the front oil seal mechanical pump. A vacuum gauge is set at the inlet and outlet to measure the pressure. The flowmeter is connected with the experimental cover through the regulating needle valve. After starting the vacuum pump and reaching the stable working condition, the measurement can be carried out. The pumping rate should be measured from the appropriate value close to the limit vacuum until the allowable inlet pressure of the pump is nearly stopped. At least four points in each order of magnitude should be measured, and their dispersion should be in accordance with the ratio of 1,2,5,7, such as 1xl0-2, 2x10-2, In the measurement process, after adjusting the needle valve to a certain pressure, the pressure data can be recorded after at least 3min after the pressure reading on the vacuum gauge is stable. If the pressure is changed, the uniform value of pressure in the measurement process should be selected. 

The structural dimensions of the test cover are specified in the Ministry of standards (jb1875-73), and its structure is shown in Figure 7-2. The inner diameter D of the test cover should be equal to the inlet diameter of the pump.

In the equipment for measuring the pumping rate, the vacuum gauge used should be seat type compact vacuum gauge and oil U-type vacuum gauge, and calibrated by the compact vacuum gauge with an accuracy of more than 10%. The air intake plane of the vacuum gauge should be parallel to the air flow direction. It is necessary to have the second-order accuracy in the measurement scale for the flowmeter used in the flow measurement.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Classification of water cooled roots vacuum pumps

(1) Roots vacuum pump with pressure stabilizing box: the rotor profile of this kind of roots pump has arc type, involute type and combined type. It has been described in detail before, but it will not be described here. The difference between this pump and dry roots pump is that it can be directly discharged into the atmosphere without the front stage pump and cooled with water instead of air cooling. A pressure stabilizing box is installed at the mouth of the pump shell, It has the effect of noise elimination and voltage stabilization, and is very convenient to use. 

(2) Roots vacuum pump with separators and silencers for direct discharge to the atmosphere: the structure, working principle and rotor profile of this roots vacuum pump are completely the same as those mentioned above. It is also a so-called wet roots vacuum pump with water cooling and direct discharge to the atmosphere with a front stage pump; The difference is that there is no pressure stabilizing box on the inlet of the pipeline, but a gas-water separator is installed on the pipeline of the inlet port, while a separation and muffler are installed on the pipeline of the entrance of * * to achieve the effect of gas water separation and noise elimination. Now, this kind of equipment is widely used in foreign countries.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Leak detection of vacuum system installation and debugging design

Vacuum system has strict requirements for sealing, so leak detection is needed in every stage of vacuum system design. The installation and debugging stage is the main body of leak detection for vacuum equipment or system. This talk about vacuum system debugging, leak detection work need to pay attention to what matters. 

In the process of vacuum system installation and commissioning, the key point of leak detection is to check and ensure the sealing of the connecting parts. The premise is that the air tightness of vacuum equipment weld has passed the leak detection in the processing stage, so as to avoid leakage detection in many aspects at the same time, resulting in increased workload and difficulty. For large and complex vacuum equipment, it is better to adopt segmented leak detection. After each stage is completed, the corresponding joint parts and welds shall be inspected once, and the next step shall be carried out after the requirements are met.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Relationship between vacuum degree and pressure in vacuum pump selection

In the selection and use of vacuum pump, we usually use the limit pressure or vacuum degree, as well as pumping speed, flow and other parameters to determine the performance of vacuum pump. And then there's a problem here, where many customers struggle with the relationship between vacuum and pressure. 

Vacuum refers to the rarefaction of a gas. We usually use "high vacuum" and "low vacuum" to express it. In other words, the rarer the gas is, the higher the vacuum degree is; otherwise, it means the vacuum is low, which is always expressed by pressure. The pressure in vacuum system is synonymous with pressure, which refers to the vertical force of gas on the surface of solid or liquid per unit area. Therefore, we can generally understand that the more gas, the greater the natural force on the surface of the object, the greater the pressure; on the contrary, the less gas, the smaller the force, the smaller the pressure.

The higher the vacuum degree is, the thinner the gas is. That is to say, the less the pressure on the object will be. The lower the vacuum degree is, the more gas there is, the greater the pressure will be.

Therefore, when we select the vacuum pump, we can see that the lower the limit pressure, the higher the vacuum degree of the vacuum pump, and the more thorough the corresponding pumping performance, which can achieve lower pressure in practical application.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Principle of water cooled roots blower

The principle of water-cooled roots blower? As the name implies, the heat dissipation of Roots blower is realized by water cooling. Many customers do not know about the water-cooled roots blower. Today, the editor will bring you the relevant knowledge of water-cooled roots blower. 

As we all know, the working principle of Roots blower is completed by the cooperation between the fan body and the motor. When the pressure and air volume of Roots blower are different, some fans with extremely high pressure will generate heat during operation. Generally, when the pressure is higher than 80kPa, it is necessary to install a water-cooled circulating cooling system, The purpose of this is to protect the bearing and gear from damage caused by high temperature, ensure the normal operation of the fan and prolong the service life.

After installing water cooling system inside roots blower, it can cool down the whole structure of the fan very well. The temperature difference between the water-cooled roots blower and the water-cooled roots blower is about 10 degrees Celsius. Although the water-cooled roots blower has the characteristics of rapid cooling, it has the risk of freezing damage in the cold winter in northern China. Therefore, customers should carefully re-examine whether they need water cooling when purchasing fans Consider.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Characteristics of reciprocating vacuum pump

Reciprocating vacuum pump it is relying on the piston in the cylinder for reciprocating movement to inhale and discharge gas. Reciprocating vacuum pump has horizontal and vertical two types. But horizontal piston vacuum pump is commonly used. Piston vacuum pump can be divided into single cylinder and double cylinder. The structure of the exhaust valve has slide valve type and free valve type. 

Reciprocating vacuum pump features: not afraid of steam, firm, easy to operate. It is mainly used to extract air or other gases from closed containers or reactors. Unless special measures are taken, general reciprocating vacuum pumps are not suitable for removing corrosive gases or gases with particulate ash.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

vacuum in electron beam melting furnace

Electron beam melting furnace: the electron beam melting furnace mainly uses the huge heat energy emitted by the electron beam as the heat source for smelting or alloy. It has the same function as vacuum induction furnace and vacuum arc furnace. Due to the high cost of smelting, it is only used for melting refractory metals, active metals or alloys. Most metals are smelted in other vacuum furnaces. In some special cases, such as high temperature and strict prevention of pollution, electron beam furnace is sometimes used to melt, refine and cast ingots, and the effect is very good.

The main difference between electron beam melting furnace and vacuum electric arc furnace is that the heat source comes from the arc between electrode and consumable electrode when melting metal or alloy in vacuum arc furnace. The heat of melting various materials in the electron beam melting furnace comes from the electron beam with high energy density emitted by the electron gun. Electron beam melting can avoid the pollution of electrode and keep the molten pool, so that it can be thoroughly purified, and the shape of melting material is not limited.

Generally, electron beam melting furnace consists of electron gun chamber and melting chamber. The electron gun chamber can be discharged by mechanical pump and diffusion pump to obtain the vacuum degree of 10-4 ~ 10-6 Torr. The smelting chamber can be composed of mechanical pump, booster pump and diffusion pump, or multi-stage Roots pump can be used for exhaust to obtain vacuum degree of 10-2 ~ 10-6 Torr.

Water Ring Vacuum Pump manufacturers

Water Ring Vacuum Pump

SSR Roots Type Blowers

Introduction of air-cooled self circulating water ring vacuum pump unit

In the process of using water ring vacuum pump, because water is used as working fluid, and working fluid water is continuously injected into the pump, many users do not pay attention to environmental protection when directly working fluid (water) is discharged through the drain outlet of vacuum pump, which makes the waste of water resources and environmental pollution, and even increases the use cost of enterprises. Some users will make water tank for water ring vacuum pump alone or use soda separator at the upper position. The water ring vacuum pump will enter the water pump into the water tank or soda separator, and then it will be sucked into the pump cavity through the self-priming capacity of the pump itself, and then it will be discharged into the water tank to make the reciprocating cycle, but the working process of the water ring vacuum pump will generate heat, such as the invalid power heat of the vacuum pump and the heat of the vacuum pump As a result, the heat of the vacuum pump will be higher and higher in the water temperature of the water tank, and the higher the water temperature of the working fluid, the efficiency of the vacuum pump, many users will add water to the side of the water tank, so it will also lead to waste of water resources and environmental pollution.

In view of the above problems, the R & D team of Feiyao company independently developed the air-cooled self circulating water ring vacuum pump unit in combination with the characteristics of the water ring vacuum pump, cooled the circulating working liquid water through air cooling to ensure the water temperature requirements of the water ring vacuum pump, thus ensuring the service life of the water ring vacuum pump and zero discharge of the used working liquid (water).

Difference Between Air Cooled Roots Vacuum Pump And Common Vacuum Pump

EVP Vacuum Pump Helps The Development Of Metallurgical Industry

Water Ring Pump

Development of screw vacuum pump

Screw vacuum pump is a kind of non-contact dry-type pump, which is an ideal kind of pump in the early 1990s. The core component is a pair of screw rotors with meshing clearance. There is no contact between metal and metal in the pump cavity, and the components in the air extraction cavity have no friction. The structure is simple and compact, and there are few vulnerable parts. It has the advantages of high vacuum, long service life, low energy consumption, no oil pollution, and small use site Point.

One lead of the screw vacuum pump is equivalent to the first stage pump, and the screw vacuum pump with multiple leads is equivalent to the multi-stage pump in series. Compared with the dry vacuum pump with multi-stage series connection such as claw vacuum pump and multi-stage Roots vacuum pump, the screw vacuum pump directly pushes the gas from the suction side to the exhaust side because there is no internal channel between the pumps at all levels, so the condensable gas, dust and The gas of particles is not easy to block and easy to clean. The single screw vacuum pump can realize the working range from 105Pa to 0.1pA. It has strong exhaust capacity, operates in dry mode, and is environmentally friendly. It is widely used in electronic, photovoltaic, pharmaceutical and chemical industries. The semiconductor industry is one of the most widely used screw vacuum pump industries.

In polysilicon preparation, semiconductor etching and other processes, corrosive gas and abrasive particles are often used or generated. In addition to the process that some products of semiconductors need particles, it is generally not expected that particles are mixed into the pump oil, but that the dry screw vacuum pump can meet the requirements except that particles are discharged from the pump. In the field of petroleum, chemical industry and biopharmaceutical industry, because there is no oil or water in the pump cavity, the dry screw vacuum pump is generally used as the pre-stage pump of the oil-free cleaning vacuum system to prevent oil pollution. Compared with the traditional processing technology, the vacuum degree is higher, the clean vacuum can be obtained, and the recovery of the intermediate volume agent can be realized, which has incomparable advantages in oil gas, solvent recovery and other aspects Potential. In the fields of electronics, vacuum coating, aviation, nuclear industry and so on, screw vacuum pump can pump out common air, inflammable and explosive gases, corrosive gases, especially to meet the requirements of high clean vacuum environment. In textile, metallurgy and other industries, the dry screw vacuum pump is more efficient and energy-saving than other types of vacuum pump in the process of vacuum defoaming and vacuum blowing decarburization (VOD) related to spandex, aramid, fiber and metallurgy.

Dry Scroll Vacuum Pump

Dry Screw Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Introduction to the connection mode of water ring vacuum pump

1. When wrapping with polyester insulating tape, it is necessary to press half of the first circle, wrap 8-12 layers. After wrapping with water ring vacuum pump, wrap two layers with plastic tape for strength.

2. Strip the copper core of the cable on the water ring vacuum pump about 30-35mm long, and wipe the copper wire with abrasive cloth to make it bright. Similarly, strip the copper wire of the external three-core cable 30-35mm, and wipe it with abrasive cloth.

3. Insert the three core cable and the stripped copper wire part of the external cable in pairs, then bind and tie with a thin copper wire as shown in the figure, cut off the remaining part, and press flat with scissors to prevent tying.

4. The three wire ends shall be firmly welded with solder respectively, and the surface of the solder joint shall be smooth without burr and false welding. If the welding is not firm or smooth, the water ring vacuum pump shall be re welded until the requirements are met.

5. Wrap three wires together with plastic tape and bind two layers. The first layer shall be more than 50mm over the end of each conductor insulation layer and the second layer shall be more than 50mm over the end of the first layer.

6. After binding, take a basin of cold water to soak the wrapped thread in water safely. After 12 hours, use a 500V megohmmeter to measure the insulation not less than 50 megohm. Otherwise, bind it again until it meets the requirements.

7. The grounding wire of the water ring vacuum pump shall also be wrapped according to the wiring process requirements of the submersible cable.

Dry Type Oilless Vacuum Pumps

Liquid Ring Vacuum compressor

industrial vacuum pumps,vacuum furnaces

How to ensure the tightness of vacuum pump

Tightness is a very important property of vacuum pump, so how should we ensure the tightness of the pump?

The vacuum tightness of vacuum pump is affected by many factors, among which the important one is the shaft seal pressure. If the pressure of the shaft seal is too large, the clearance of the pump will be reduced, resulting in the heating of the shaft seal; if the pressure of the shaft seal is too small, it will increase the clearance of the pump, resulting in the excessive leakage of the shaft seal, thus affecting the working efficiency of the pump.

In order to ensure the shaft seal pressure of the pump operation, the steam supply pressure of the shaft seal formed by the self sealing of the low stable combustion load and high load shaft seal system of the pump shall be 45kpa. While meeting the pressure of the low pressure seal shaft seal, the water inflow in the oil shall be reduced, and the water level of the shaft seal heater shall be monitored. If the water level is abnormal, it shall be adjusted in time to remove the situation that there is no water level added to the shaft or the water level is too low, resulting in the drop of vacuum tightness Appear.

The above method is to ensure the vacuum tightness of the vacuum pump. At present, the pump is widely used and has a good development prospect. I hope the above method can help you.

Air Compressor Co2

Oil Free Compressor For Air

Roots Vacuum Pump Pulp Dehydration For Drying

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

Cause of failure of rotary vane vacuum pump

Cause of failure of rotary vane vacuum pump

1. Smoke and fuel injection of rotary vane vacuum pump: it means that the exhaust port of rotary vane vacuum pump is smoking and fuel injection is about during operation.

Smoke: if the pump is just started to operate with smoke signs, it is normal, and if the smoke is in the permanent disaster, it is abnormal. Handling way: smoke to clarify that the pump intake, including pipes, valves, containers have patching environment. After leak detection, punishment will be given. Smoking will be over.

Fuel injection: it is clarified that there are a large number of leakage points outside the intake port, and even the intake port is exposed to the atmosphere. The way to deal with it: seal the air inlet of the pump to make the pump run. If there is no oil injection, clarify the leakage point; the exhaust valve plate is damaged, check whether the exhaust valve plate is damaged, and change the damaged exhaust valve plate. Failure of rotary vane vacuum pump

2. Noise of rotary vane vacuum pump: This refers to the noise of the pump.

Knocking: the pump makes an irregular sound when running, like the sound of metal knocking. This is the sound of the spinner hitting the pump. This kind of environmental tension is caused by the failure of the spring between the matched discs, which is probably caused by the failure of compression or ejection. Solution: turn on the pump and check whether the spiral spring is damaged. Changed spring.

Exhaust valve noise: tension is the damage of the exhaust valve of the rotary vane vacuum pump. The way to deal with it: change the exhaust valve.

Rotary Vacuum Pump In Chemical Distillation

Water ring vacuum pump

Rotary Vane Vacuum Pump

Space gas-liquid separation of stainless steel vacuum pump

Space gas-liquid separation of stainless steel vacuum pump

Principle of gas-liquid separation technology of capillary action of stainless steel vacuum pump: liquid water will spread on the surface of hydrophilic material. If hydrophilic material is used to make porous structure (there is a gap between the holes), this porous structure will become a special channel for liquid water just like many capillaries. Similarly, the porous structure made of hydrophobic materials will become a special channel for gas. In this way, the hydrophilic / hydrophobic properties of the material are used to realize gas-liquid separation.

The quality of stainless steel vacuum pump depends on its mechanical structure and oil quality. When using stainless steel vacuum pump, it must be well protected. If the volatile organic solvent is distilled, the organic solvent will be absorbed by the oil. As a result, the vapor pressure will be increased, thus reducing the evacuation efficiency. If it is an acid gas, it will corrode the oil pump. If it is water vapor, it will make the oil into emulsion and damage the stainless steel vacuum pump.

Vacuum Pump For Autoclave Machine

Best Vacumm Pump To Vacuum

How To Solve The Bearing Heating Of Water Ring Vacuum Pump

Selection scheme of vacuum pump unit

Selection scheme of vacuum pump unit

Vacuum pump unit is usually composed of the following parts: various vacuum pumps; vacuum measuring unit; vacuum valve; vacuum pipe and some other components, such as blower, vacuum connector, air tank, bellows, dust collector and vacuum relay.

According to the working pressure of the unit, there are crude vacuum pump unit (> 1330pa), low vacuum pump unit (1330 ~ 0.13pa), high vacuum pump unit (0.13 ~ 1.3 × 10-6 PA), ultra-high vacuum pump unit (1.3 × 10-6) ~ 1.3 × 10-11 PA and very high vacuum pump unit (< 1.2 × 10-11 PA).

Roots vacuum pump (supercharger pump) for high vacuum can not be directly discharged into the atmosphere. For example, the direct exhaust atmosphere will cause the pressure difference between the inlet and the exhaust port of the roots vacuum pump to be too large, thus overloading the roots vacuum pump. Increasing the power of the roots vacuum pump motor will cause the roots vacuum pump to overheat, so the small gap between the roots vacuum pump rotors will be stuck rapidly due to thermal expansion. In order to ensure that the roots vacuum pump can achieve a higher degree of vacuum, it is necessary to ensure the gap between the rotors of Roots vacuum pump. Therefore, the roots vacuum pump must be equipped with a front-end pump. When the pressure in the system is pumped to a certain range through the front-end pump, the roots vacuum pump is started, which can prevent the roots vacuum pump from overloading. The front stage pump can be a vacuum pump which can be directly discharged into the atmosphere, such as water (liquid) ring vacuum pump, rotary vane vacuum pump, slide valve vacuum pump or reciprocating vacuum pump.

Under normal conditions, roots vacuum pump unit has more advantages than other vacuum pumps in using water ring pump as the front stage pump, mainly because it can remove a large number of condensable steam, especially when the mechanical vacuum pump in the gas town eliminates condensation. There is insufficient steam capacity, or the solvent used will degrade the pump oil and affect the performance, or it is more obvious when the vacuum system does not allow oil pollution.

The main characteristics of low vacuum pump unit are high working pressure and large displacement, but the pumping speed is lower than that of high vacuum pump unit. It is widely used in vacuum pumping and vacuum cleaning, vacuum impregnation, vacuum cleaning, vacuum degassing, vacuum drying and other equipment. The main pump of low vacuum pump unit is commonly used reciprocating vacuum pump, oil seal vacuum pump, water jet pump, water steam jet pump, water ring pump, oil steam jet pump, molecular sieve adsorption pump and roots pump. When using the low vacuum pump unit, the components such as dust collector and dry filter must also be configured according to the process requirements of cleanness and humidity of the pumped gas.

Vacuum System For Epoxy Resin Casting

air-cooled roots-liquid ring vacuum system

Open Cycle Water Ring Vacuum System

Vacuum pump for steaming frame

The main purpose of steaming machine is to combine the continuous yarn with weaving conditions and to set it after twisting, that is, to stabilize the twist at a certain pressure and temperature, and to obtain a balanced and unbroken yarn. The use process of the yarn steaming machine is vacuum-preheating-humidifying-holding-constant temperature-vacuum cooling-ending. The vacuum pump used for vacuum extraction is generally water-ring vacuum pump. The working pressure of the yarn steaming machine is -0.085-0.1MPA. The water-ring vacuum pump can extract a certain amount of condensable gas.

The steaming machine with vacuum pump can steaming yarn or fabric evenly, accurately and gently from low temperature to high temperature. The steaming process is controlled by a micro-computer, and the temperature is controlled accurately to (+0.5). This ensures that the steaming process can be accurately reproduced according to the budgeted process, avoids the generation of condensation water to the maximum extent, and makes the yarn uniform. Soft steaming treatment. Therefore, in this process can be used, the specific use of water-ring vacuum pump, according to the size of the steamer, as well as their own time requirements to choose the appropriate vacuum pump.

JZP2H type Roots and piston Vacuum system

JZPX series roots-rotary pump system

Piston Vacuum Pump Advantage

Piston vacuum pump is a very durable machine. The eccentric wheel drives the sliding valve to rotate along the cylinder wall. A large amount of oil pushed ahead of the eccentric wheel forms a large area of sealing surface, which has little effect on mechanical abrasion. In addition to sliding valves, the mechanism can automatically compensate for wear. At the same time, there is inherent imbalance in the trench, and the vibration degree can be properly controlled according to the balance method adopted. The piston vacuum pump is not sealed by oil immersion, and its oil flow is controlled by an automatic control valve in an accessible oil circuit.

The vacuum retention of the pump is not good because the static contact between the slide valve and the cylinder wall is weak. The working noise of the sliding valve vacuum pump without air ballast is slightly higher than that of the rotary vane vacuum pump with the same size (especially the pump immersed in oil). But the working noise of piston vacuum pump is lower when using air-ballast. The recovery time of two-stage pump in rapid circulation is short because of the large amount of oil splash caused by the pumping mechanism inside the pump. However, if necessary improvements are not made, the long-term operation of double-stage sliding valve vacuum pump under high pressure is not ideal.

The most prominent advantage of piston vacuum pump is that it is insensitive to mechanical damage and can be easily repaired by unskilled people. The main disadvantage is the inherent high vibration, especially when the non-equilibrium form is adopted.

Rotary-Piston-Vacuum-Mechanical-Pump

piston-vacuum-pump-for-vacuum-heat-treatment

Piston-Vacuum-Pump-For-food-packing

How to Improve the Performance of Stainless Steel Vacuum Pump

We introduce how to improve the performance of stainless steel vacuum pump, so that you can use it. Let's have a look together.

In the stainless steel vacuum pump chamber, it is divided into low-pressure chamber area and high-pressure chamber area. If the position of the filling port is in low-pressure area, the external fluid supply can be realized by self-priming of the pump itself, which requires less filling pressure. If the high-pressure cavity is filled with fluid, then the pressure of the cavity must be greater than the pressure of the pump cavity in order to carry out the fluid replenishment. Otherwise, the working fluid can not be replenished in time, which will cause gas to flow back from the compression chamber to the suction chamber, affecting the performance of the stainless steel vacuum pump.

After many tests, it is found that the performance of stainless steel vacuum pump can be reduced by using the self-priming method of the pump, because the pump can supply liquid at the suction chamber or at the end of the impeller, and the working fluid has been working for a period of time (starting from the completion of the compressed gas in the working fluid), that is, the energy is available. A certain loss, coupled with the impact loss of the liquid ring caused by fluid replenishment at this time, also reduces the effective work of the working fluid on the gas, consuming a part of the energy. If the replenishment fluid is placed in the air chamber position, the replenishment fluid can obtain sufficient energy and participate in the next round of suction and exhaust process with little energy loss. Therefore, it is beneficial to improve the performance of stainless steel vacuum pump by replenishing fluid in the high-pressure chamber position.

Vacuum-pump-in-feeder

Vacuum-pump-for-printing-press

Vacuum-system-for-freeze-drying-process

rotary vane vacuum pump parameters

1. Limit Vacuum Degree of Rotary Vane Vacuum Pump

The minimum stable pressure at the inlet end of the rotary vane vacuum pump is the limit vacuum of the pump.

Rotary vane vacuum pump is the same as general mechanical pump. The limit vacuum on the pump refers to the vacuum measured by absolute vacuum gauges such as rotary Maxwell gauge for permanent gas. It is usually 10-4 tonnage, and the best one can reach 10-6 tonnage. However, due to the influence of various vapors and oil and gas, the limit vacuum is only l0-2-10-3 Torr for all gases (equivalent to the pressure value measured by thermocouple). In order to improve its vacuum limit, water absorbent (such as phosphorus pentoxide, etc.), oil absorbent (such as 13X molecular sieve, activated alumina, etc.) or liquid nitrogen cold trap can be added between the pump and the pumped parts or the later stage high vacuum pump. Proper use of vacuum tanks can also be beneficial.

There are many factors affecting the ultimate vacuum, such as the structure of the pump, the performance of the oil, the amount of oil and the working temperature. After using for a period of time, the limit vacuum of the pump will be reduced a little. Of course, it can be recovered and improved by repairing and adjusting.

2. Pumping rate and characteristics of rotary vane vacuum pump

Pumping rate: At a certain pressure and temperature, the volume of gas pumped from the container in a unit time is called pumping rate.

The name brand gives the nominal pumping speed of the pump, that is, the theoretical pumping speed of the pump.

3. Design and Accounting Method of Geometric Parameters of Rotary Vacuum Pump

The design method of geometric parameters of rotary vane vacuum pump is often used in maintenance. Because some pump geometry size changes greatly in maintenance, parameters such as pumping rate should be estimated and corrected according to the actual data. At the same time, the size of some parts can be amended accordingly.

Roots-Vacuum-Pump-for-Power-Transformer

Roots-Vacuum-Pump-for-Vacuum-Forming

Roots-Vacuum-Pump-for-Vacuum-Pumping

Liquid-Ring-Vacuum-Pump-for-Vacuum-Conveyor