How to operate roots vacuum pump better

How to operate roots vacuum pump better?

Roots vacuum pump unit has been applied in metallurgy, petrochemical industry, paper industry, food industry, electronic industry, etc. the application range of Roots vacuum pump is extremely wide. Many users are specially equipped with one or several standby pumps, and some of them are temporarily placed due to the long-term non operation of the project. In this case, there is a very important issue to be noted, which is also to ensure roots A standard of vacuum pump life is that the long-term idle equipment should empty the cooling water in the pump cavity in time to protect the pump itself.

The actual production of Roots vacuum pump is carried out through various processes. While strengthening the quality of blank, it is also necessary to strictly carry out the process of deep processing. For the emergence of waste products, it is necessary to timely make a management system conducive to production. Without affecting its order production, it is necessary to effectively deal with the waste parts, and control the working hour quota, and do a good job in these bases On the basis of basic work, we should timely respond to the needs of the market and strengthen the optimization of product processing technology. How to operate roots vacuum pump better?

The application strength of Roots vacuum pump has become an important condition for promoting the development of enterprise productivity. It has different application capabilities for its application in different industries, but the same thing is that it can not be used as a single pump, but can only be used as a unit product assembled with other equipment, which plays a mutual driving strength foundation. Through its own application performance, it can be effective For the use of other equipment to achieve a higher performance strength, improve the driving effect of product use.

Under the premise of speeding up the development of practical effect of Roots vacuum pump, we should make the strength of product application and performance continuously reflected, further enhance the improvement of product advantage, let the application of product drive the development of enterprise productivity, promote the continuous improvement of application performance in all aspects, fully accelerate the driving of product application ability, and make it continuously reflected on the basis of reasonable application The outstanding performance of the product application effect reflects the applicable performance of the equipment.

In order to improve the quality of Roots vacuum pump, it is necessary to improve the development of its overall application strength in combination with the application of the product, and constantly realize the overall drive of the product application ability, so that it can enhance the continuous improvement of its quality advantage under the function of reasonable application, and make it reflect the internal application advantage in the development process.

VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

Heat treatment equipment

How to drain oil by liquid ring vacuum pump

How to drain oil by liquid ring vacuum pump

Do you know how to drain oil from liquid ring vacuum pump? Let's learn more today!

1. If you want to drain all the oil in the liquid ring vacuum pump box, you can screw off the drain plug at the lower part of the box to drain the oil.

2. When the liquid ring vacuum pump discharges oil outside, the liquid level shall not be more than 30mm from the top plate of the oil tank to ensure the lubrication and cooling of each bearing in the pump. When the volume of the jack working chamber is too large, additional oil tank shall be set to ensure that the minimum height of the liquid level after the oil discharge is not less than 100mm to avoid suction.

3. After the speed regulating hydraulic Siemens liquid ring vacuum pump runs for 500h for the first time, change the oil and clean the oil tank and oil filter. Test the oil quality by visual inspection and laboratory test, and change the oil in time when the oil quality deteriorates. The oil tank and oil filter must be cleaned at the same time when changing oil. If there are metal chips or water in the oil, find out the cause and remove the fault.

4. In a short period of time when the liquid level drops, the bearing is lubricated by the oil attached and the oil splashed by the plunger spring. The oil filter of the oil tank and the oil filter under the pump are made of 230 mesh / inch copper wire mesh. The oil filter mesh should be cleaned frequently to prevent blocking. The oil temperature of the oil tank should not exceed 60 ℃ when in use. If necessary, appropriate measures should be taken for cooling.

Vacuum Pump In Vacuum Forming And Laminating Process

Vacuum System In Space Simulation Cavity

Dry Type Oilless Vacuum Pumps

How does bearing of vacuum pump get hot

How does bearing of vacuum pump get hot?

Vacuum pump is a device which can improve, produce and maintain vacuum in a closed space by various methods. It has been widely used in metallurgy, chemical industry, food, electronic coating and other industries, and has attracted the attention and favor of market users. However, users often find that the bearing is overheated and the temperature is too high in the process of using, so what's the cause? Here's a brief explanation for you.

During the operation of the vacuum pump, the bearing heating is mainly based on its high-speed operation. The specific reasons include valve plate cracking, shaft end seal failure, excessive bearing preload, sensational influence, smooth appearance and bearing damage. The following is a detailed analysis:

1. Valve plate cracking: the valve plate cracking causes the pressure imbalance on both sides of the impeller, axial force will occur on the rotor, which will aggravate the bearing load, and long-term operation will increase the bearing temperature.

2. Shaft end seal failure: when the shaft end seal packing is damaged or the seal water channel is blocked, the suction and exhaust performance of the pump will be affected. If only one side of the seal fails, the pressure on both sides of the impeller will be unbalanced, and axial force will occur on the rotor, which will aggravate the bearing load and increase the bearing temperature.

3. Bearing preload is too large: this situation will promote the reduction of bearing clearance or no clearance, forming bearing temperature rise.

4. Sensationalism: too much sensationalism of pump body or bearing will cause too high bearing temperature.

5. Smooth appearance: if the increase of smooth grease is too large or too small, or the type of smooth grease is inconsistent, the use time is too long, or the smooth grease is polluted, bearing heating will be formed. At this moment, you should check the type of smooth grease, ask the manufacturer for the appropriate amount, and adjust the smooth grease to recover the bearing temperature.

6. Bearing damage: after the bearing tumbler and bearing cage are damaged, the appearance of bearing overheating will appear. If the bearing is damaged, it is necessary to replace the new bearing in time.

The above is the cause analysis of bearing heating of vacuum pump and relevant countermeasures. As the saying goes, "be prepared for no harm". Only when you have relevant knowledge and meet the corresponding situation, can you deal with it in a timely and effective manner. I hope the above information will be helpful to your understanding and learning.

Wet Chlorine Liquid Ring Compressor

Vaccum Pump For The Metal Printing Industry

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Oil lubricated screw vacuum pump

GL series is a series of new intelligent and efficient vacuum pumps, which are driven with variable speed. The "plug and play" and recognized anti vacuum pumps designed on the basis of these principles, vacuum is the most common in industrial applications where the Engineer provides performance at maximum working pressure. provides a global uniform system.

Characteristic:

Reduce the area occupied;

Ultra low back pressure, low power consumption; in about 50% reduction of energy consumption, leading technology, variable speed drive and innovative design combine to provide a significantly increased performance of engine efficiency and reduced life cycle cost compared to dry vane vacuum pump lubricating oil; quiet running noise level data corresponds to about half of the technology; due to the sustainable productivity Comprehensive efficiency of sustainable development. In accordance with commitments on energy management and environmental issues / 14001 ISO 50001;

Reduce the impact on the environment, as very high oil maintains the maximum pressure from atmospheric pressure at all working pressures;

VACUUM FURNACE

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Heat treatment equipment

What is the difference between single stage and double stage vane pumps

The rotary vane vacuum pump is a kind of variable volume mechanical vacuum pump which uses the rotary motion of rotor and the rotary vane which can slide in the rotor groove to obtain vacuum. When the working fluid is used to lubricate and fill the dead space of the pump cavity to separate the exhaust valve and the atmosphere, it is commonly known as the oil seal vane vacuum pump. When there is no working fluid, it is a dry rotary vane vacuum pump.

In the oil seal rotary vane vacuum pump, it is commonly known in China that the belt driven is rotary vane vacuum pump, while the pump directly connected with the motor or connected with the coupling is called direct rotary vane vacuum pump. In each pump, there are single-stage and two-stage. In the single-stage pump, the limit pressure and use of the pump are different because of the different structure and parameters.

Their common features are simple structure, convenient use, starting from atmospheric pressure, direct discharge to the atmosphere, small eccentric mass, easy maintenance, and improved pump structure to improve reliability.

In terms of pump structure, in order to prevent oil return when the pump stops, some pumps are equipped with check valves that can automatically cut off the oil circuit, some with shut-off valves for the air inlet channel, and some with oil pumps and control structures to automatically cut off the air circuit when the pump opens the gas town for operation and suddenly cuts off the power to keep the pump port in the state of vacuum vane vacuum pump. In terms of accessories, there are demister, odor filter, population filter, dust filter, steam condensation trap, chemical trap for blocking debris such as broken glass, etc., and there are control pump temperature to improve water vapor extraction rate and protect temperature control water volume of the pump.

The two-stage rotary vane vacuum pump can be widely used in refrigerator, air conditioner, bulb, fluorescent lamp, bottle container production, electronics, metallurgy, medicine, chemical industry, oil filter, printing machinery, packaging machine and other industries. It can be used as the pre-stage pump of diffusion pump, roots pump, molecular pump, etc., and it can be used for supporting and experimental research and application of electronic instruments, medical instruments, etc. Because the direct coupled pump has no dust pollution caused by belt friction, it is more widely used because of its small volume, light weight, material saving and increasingly perfect function.

Vacuum Pump Coating Process

Water ring vacuum pump

Rotary Vane Vacuum Pump

What kind of vacuum pump is good for plastic industry

What kind of vacuum pump is good for plastic industry

The vacuum pump is mainly used in the molding process of the blister. It uses the suction generated by the vacuum pump to heat and soften the blister material, and then clings to the blister abrasive to form the product. According to the thickness of materials, there are two categories: thick material and thin material.

When selecting vacuum pump for blister, it is necessary to select vacuum pump according to specific process, mainly referring to the following two main parameters:

Vacuum degree: the so-called vacuum degree is a way to express the degree of air thinness, usually expressed in units such as Pascal, mbar, mmHg, etc.

After the molding of the Blister products, the product bubbles are mostly due to the vacuum degree can not meet the requirements, resulting in the product defects. Compared with products with deep grooves, the requirements of vacuum degree are relatively high.

Flow: refers to the volume of fluid pumped by vacuum pump through closed pipe or effective section in unit time, which is usually expressed as m3 / h, L / s, L / min

Vacuum flow is an important sign to measure suction. When selecting vacuum pump, we should pay attention to the specification and thickness of the product to calculate the amount of air to be removed in an hour or a minute, so as to determine the amount of flow needed.

Liquid Ring Air Compressor

Vacuum System Of Vacuum Brazing

Water Ring Vacuum Pump In Vacuum Concentration

How to determine the time needed for vacuum pumping in refrigeration system

How to determine the time needed for vacuum pumping in refrigeration system

In order to correctly use the vacuum pump in hand (such as the pumping rate of 1l / s) and make the pumping effect reach the vacuum degree required by the refrigeration system, it is necessary to correctly determine the pumping time of the pump.

The method is as follows: connect the pipeline, vacuum for 20min, and close the vacuum pressure gauge valve and stop valve. Disconnect the joint between the vacuum pressure gauge valve and the transparent nylon pipe, inject 2ml18 refrigerant oil from the pipe orifice, connect the transparent nylon pipe and the vacuum pressure gauge valve, and bend the transparent nylon pipe down as shown in the figure, so that the 18 refrigerant oil flows to the lowest place automatically, forming an oil column.

At this time, the vacuum pump is still running, slowly open the stop valve (note that it should prevent the refrigerant oil from entering the vacuum pump), and then slowly open the vacuum pressure gauge valve. At this time, the refrigerant oil flows rapidly to the direction of the pump. Because there is only 2ml of oil, it adheres to the pipe wall in the flow process, and then returns to form an oil column This process goes on and on. At the beginning, a number of small oil columns are formed. With the increase of the vacuum degree in the refrigeration system, the air flow decreases, and the oil column changes from small to large, from fast to slow. When the large oil column is to be formed, it will not move within 5min, and the vacuum pumping time used will be recorded, that is, the time required for the vacuum pumping of the vacuum pump in the future.
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Characteristics of the newly developed rotary vane vacuum pump

Characteristics of the newly developed rotary vane vacuum pump

The 2XZ type rotary vane vacuum pump newly developed by our company is a kind of vacuum pump equipment with mandatory oil prohibition, which solves the phenomenon of oil return and oil injection well before, and is recognized by the majority of users. This rotary vane vacuum pump has the following features:

1. Fully sealed structure

Direct coupled pump is the only rotary vane pump in the world that seals the motor in the oil tank. This structure will completely eliminate the possibility of shaft end leakage. At present, almost all rotary vane vacuum pumps in China have oil leakage problems.

2. Air ballast valve with air cushion adjustment

Air cushion is an effective means to eliminate pump noise, and the function of adjustable air cushion is considered in the structural design of the air ballast valve of the pump. An independent system on the air ballast valve can adjust the air volume of the air cushion. In the actual debugging, we obviously feel the importance of this structure to noise reduction.

3. The protection function of the pump is complete

The pump itself is equipped with the air release stop valve used when stopping the pump. The valve is a differential pressure valve controlled by a solenoid valve, and the electric energy required by the solenoid valve is provided by the generator of the motor. Thus, whether the motor moves or not determines whether the generator generates electricity, and thus whether the solenoid valve acts. In addition, the pump also has overload protection switch. Once the pump is stuck or overloaded, the motor current will rise abnormally, and the protection switch will automatically cut off the power supply. From the perspective of use, this function is very useful.

4. The scope of application of the pump is wide

Suitable for 50Hz, 60Hz and three-phase 220V, 380V power supply system. One of the reasons for the strong drainage steam capacity of the pump is that it can still maintain a high vacuum degree in the gas ballast, the other is that the oil temperature is high, and the oil temperature is above 80 ℃ in normal operation. With such a high oil temperature and an effective gas ballast, the drainage steam capacity of the pump is greatly improved. In particular, as long as synthetic oil is selected, the pump can become a halogen resistant vacuum pump.
Roots Rotary Vacuum Unit In Medical Vacuum Freezing

Water ring vacuum pump

Rotary Vane Vacuum Pump

How to adjust the capacity of vacuum unit in freeze drying process

How to adjust the capacity of vacuum unit in freeze drying process

In the freeze-drying process, the commonly used vacuum equipment is the vacuum unit. The vacuum degree required by this process will be particularly high, and the extracted gas contains water vapor or condensable gas, so it is suitable for roots water ring vacuum unit.

In the specific use process, the total pressure in the drying box directly affects the heat exchange to the product and the water vapor quality conversion to the condenser, so it must be accurately controlled and measured.

By reducing the pumping capacity of the vacuum pump or shutting down the vacuum pump, the sublimated non condensable gas will gradually gather in the cold well, reducing the condensation speed of the cold well, so as to increase the pressure of the cold well and the drying oven. The method can increase the total pressure in the tank, improve the heat transfer conditions and the allowable temperature of the sublimation interface, and temporarily shut down the pump can also reduce the operating cost. The main disadvantage is that the measurement error of the conduction vacuum gauge is large, which may lead to uneven ice formation in the cold trap and even block the inlet.

Double Stage Vacuum Pump Selection

Rotary Vacuum Pump In The Plating Of Crystalline Metal

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Operation procedure of screw vacuum pump

Operation procedure of screw vacuum pump

Next, the manufacturer of screw vacuum pump will introduce the operation steps of screw vacuum pump

Screw vacuum pump is widely used in domestic pharmaceutical, chemical, semiconductor and other enterprises, and the key reason for equipment problems is the failure or lack of operation steps of vacuum pump. Here are the operation steps of the equipment:

I. startup operation steps: contact with the central control personnel on site for confirmation, and then start the vacuum pump through the on-site operation column startup button. Close the outlet pipe drain valve. Check or adjust the flow of nitrogen seal gas, and confirm that the flow is 2.5-3l/min. Open the purge valve and confirm that the flow of the flowmeter is increased. After five to ten minutes of purging, close the purge valve. Open the process inlet valve and cut in the system. During operation, pay attention to observe the temperature of the machine body, and control the temperature by adjusting the water volume through the temperature regulating valve. When the temperature regulating valve is at 0 scale, the water volume is large, and when it is at 5 scale, the water volume is small. The temperature shall be controlled at 50-75 ℃ and no more than 80 ℃.

II. Shutdown operation steps: close the process inlet valve and cut out the system. Open the purge valve, and after 20 to 40 minutes of purging, close the purge valve. Stop the machine through the stop button of the field operation column. Close the nitrogen valve of screw vacuum pump. Close the cooling water valve. If it is not used for a long time in winter, drain the cooling water in the body and pipeline to prevent freezing. Open the drain valve of the outlet pipe, open the drain valve of the inlet filter, and check whether there is condensate.

Screw vacuum pump is an updated product of oil sealed vacuum pump, and mastering the correct operation steps is the key step and the beginning of using the equipment. If the operation steps are right, the problems in the use process will be reduced, and the service life of the equipment will be prolonged.

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Causes of 2BV vacuum pump wear

Causes of 2BV vacuum pump wear

The wear of 2BV vacuum pump can not be avoided after long-term use, but if it can be clear what causes the wear, it can be avoided as far as possible in use to reduce the wear.

The wear of the journal surface of 2BV vacuum pump is uneven. The radial wear of the main journal and the connecting rod journal is mainly elliptical, and the wear parts correspond to each other, that is, the wear part of each main journal is close to the side of the connecting rod journal, and the wear part of the connecting rod journal is also close to the side of the main journal. The crankshaft journal has conical wear along the axial direction. The elliptical wear of the journal is caused by the uneven distribution of the force acting on the journal in the circumferential direction

When the engine is working, the comprehensive force 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, resulting in large wear on the inner side of the connecting rod journal, forming an ellipse. The reason for the tapered wear of the connecting rod journal is that the oil passage leading to the connecting rod journal is inclined. When the pump rotates, under the action of centrifugal force, the mechanical impurities in the 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 tapered.

In addition, the bending of the connecting rod, the non perpendicularity of the central line of the cylinder and the central line of the 2BV vacuum pump and other reasons will make the axial force on the journal uneven, and cause the wear deflection. The wear of the main journal is elliptical, mainly due to the influence of the centrifugal force of the connecting rod, the connecting rod journal and the crank arm, so that the relative wear between the side near the connecting rod journal and the bearing is greater. In addition, the journal surface may be scratched and burned. Scuffing is mainly caused by unclean engine oil, in which large hard mechanical impurities are scratched on the journal surface. The burn of the journal surface is caused by the burning of the bearing. The burning of the bearing is mainly caused by insufficient lubrication, too thin oil, blocked oil circuit and other reasons.

2BV vacuum pump should pay attention to these causes of wear when using. Although it can not completely avoid the wear problem, it can effectively reduce the wear and increase the service life of the equipment.

2BV Double Stage Liquid Ring Vacuum Pump

Liquid Ring Vacuum Pump

Liquid Ring Vacuum compressor

Influence of particulate matter on water ring vacuum unit and its solution

During the operation of water ring vacuum unit, some users reported that the gap was increased and the leakage was also large. This is because the pumped material contains a large number of solid particles. With the friction between the solid particles and the pump body, it will greatly affect the service life and cause various problems.

If the pumped gas contains solid particles, some of the particles will be discharged out of the pump with the gas, and some of the particles will continue to rub in the gap of the pump, resulting in the increase of the gap, resulting in the increase of the leakage, and the decrease of the vacuum degree and air volume. Therefore, the water ring vacuum unit is not suitable for pumping the gas containing a large number of solid particles, especially the solid particles with larger particle size and higher hardness.

Solutions when it is necessary to pump gas containing particles:

If it is unavoidable, the gas can be purified before entering the water ring vacuum unit (such as setting filter screen or adding vacuum buffer tank). If purification is difficult, the particles in the unit shall be washed clean after pumping.

Before using the water ring vacuum unit, confirm the use environment and the materials to be pumped, so that the corresponding treatment measures can be taken in advance to avoid the damage to the equipment caused by solid particles and other materials.

2XZ Double Stage Vacuum Pump

Piston Vacuum Pump In Drainage System

Vacuum System In Magnesium Alloy Radiator

Selection of main pump and auxiliary pump of vacuum pump unit

Selection of main pump and auxiliary pump of vacuum pump unit

Vacuum pump unit is composed of roots pump as the main pump and rotary vane pump as the front pump in series. But it doesn't mean that the two pumps can be combined and used casually. Only by meeting certain requirements can the two pumps form a unit. The composition conditions are as follows:

The function of the front stage pump is to reduce the vacuum discharge pressure of roots pump, so as to control the pressure difference and compression ratio between the inlet and exhaust within a certain range. Because the compression ratio of roots pump is limited, it is important to choose pumping speed. The compression ratio of roots pump changes with the change of discharge pressure. At high discharge pressure, the compression ratio is 3:1, and the compression ratio can reach 40:1 or higher between 1 and 10 mbar.

The pumping speed of the front stage pump shall be selected according to the long-term working pressure range of the vacuum pump unit. In addition, we should consider the demand for the length of pre pumping time. If the working time is longer than the pre pumping time, a smaller pre pump can be selected;

If the vacuum chamber is large, and it is required to reach the pre vacuumizing degree soon, a large pre-stage pump shall be used. It should be noted that the actual operation time difference of roots pump shall not exceed its allowable value, and it is generally recommended to control it below 75%, otherwise, the vacuum pump unit will overheat, overload or bite.

The selection of vacuum pump unit needs to be considered from the service conditions of the main pump and auxiliary pump, so that it can not only be used to extract air and other non condensable and non corrosive gases, but also can be used in various vacuum systems requiring large pumping speed and high vacuum.

VACUUM FURNACE

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Roots vacuum pump unit in petroleum distillation

Roots vacuum pump unit in petroleum distillation

According to the performance and characteristics of Roots vacuum unit, the economic benefits of replacing steam jet vacuum pump in vacuum distillation unit are summarized. It has many functions, but it is not well known. Then the next small edition for its application in petroleum distillation, to make a simple introduction for you, let's take a look at it.

The traditional vacuum pump of steam jet is used as the main means of evacuation in almost all the vacuum distillation units of domestic refineries. Although the water steam jet vacuum pump is simple in structure, small in maintenance and reliable in operation, it consumes a lot of water steam and cooling water, but the vacuum obtained is relatively low, which makes the crude oil not get deep displacement and the oil displacement rate is relatively low. In addition, there are a lot of condensate mixed with the condensate of oil vapor, which wastes oil and causes serious environmental pollution In other countries, the so-called "dry distillation" is used in the refinery pressure reducing devices. In addition to the transformation of the original decompression tower.

Roots vacuum pump unit is mainly to select and modify the design of the evacuation equipment. Roots vacuum pump with return air-conditioner is used as the main pump in the United States to overcome the heating of Roots vacuum pump under high pressure. The two-stage water ring vacuum pump is selected as the front stage vacuum pump to form the air extraction unit. In addition, a cold source is needed to maintain the long-term operation of the unit. Therefore, the design structure is more complex and the cost is more expensive.

Roots vacuum pump unit has a wide range of applications. It can't only be used in common fields. In fact, it can also be seen in many industries with partial doors. It plays different roles in different industries and fields. Therefore, it is necessary to be more careful in product selection.
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Vacuum System In The Manufacture Of Aeromechanical And Electrical Components

Liquid Ring Vacuum Pump

Pipeline design of water ring vacuum pump

Pipeline design of water ring vacuum pump

Before using the water ring vacuum pump unit, it is necessary to design the pipeline route, because the pipeline is the main device to send and pump flammable and explosive gas. Once the pipeline route is unreasonable, it will easily lead to various troubles. Therefore, it is necessary to design a reasonable pipeline route, which is conducive to the work efficiency and stability of the unit in the later stage. So how to design a reasonable pipeline? Xiaobian will provide you with several methods.

1. The shorter the interval between the fragmentary outlet of the water ring vacuum pump unit and the inlet of the pump, the better.

2. The less the pipeline turns, the better.

3. The outlet pipe shall be higher than the inlet line of the pump, and the outlet pipe shall be prevented from factors that cause greater resistance, such as climbing up the outlet pipe, right angle turning, etc.

4. The diameter of the matching inlet and outlet pipe should be different from that of the commodity. For example, if the vacuum is small, the receiving diameter of the matching inlet and outlet pipe can be small, but not less than 70% of the commodity inlet and outlet diameter, and the outlet diameter should be greater than or equal to the inlet pipe diameter.

5. The corner of the pipeline shall be smooth.

6. The water inlet pipeline of vacuum pump unit shall be equipped with valves to regulate the amount of water inlet, which has an impact on the vacuum degree. When regulating the amount of water inlet, the valve shall be controlled by checking the pointer of the vacuum gauge.

Therefore, in order to ensure the normal operation of the water ring vacuum pump unit, it is necessary to achieve the correct installation, operation specifications, maintenance, etc., and all these premises are to ensure that the design of the equipment is reasonable first, otherwise the unreasonable equipment, no matter how it is operated, will not be correct, so whether it is the equipment or anything, it is necessary to lay the foundation premise first, and then carry out the next operation.
LRC-20 Liquid Ring Compressor

2BE Two Stage Vacuum Pump

Oil Free Vacuum Pump Application

How to reduce the noise of slide valve vacuum pump

How to reduce the noise of slide valve vacuum pump

Slide valve vacuum pump is also a kind of vacuum pump widely used in many vacuum equipment. It has the advantages of large pumping speed, simple structure, reliable performance and high vacuum degree, so it becomes a product with large market demand. However, the main problem of the pump is that the noise and vibration are relatively large, which has a bad impact on the user's environment, and will damage the service life of the vacuum system.

Therefore, it is of great significance to improve the noise and performance of the slide valve vacuum pump, prolong the working life and efficiency. It can be seen that one of the main reasons for the large noise of slide pump is the impact of oil and gas. In order to reduce the impact noise of the slide valve vacuum pump, the commonly used method in China is to reduce the impact by reducing the rotating speed of the slide valve pump. For example, changing the rotating speed of the h150 slide valve pump from the original 540 R / min to 480 R / min can reduce the noise by more than 3 DBA. However, when the pumping speed of the slide pump is constant, reducing the speed of the low pump means increasing the volume of the pump. Obviously, this measure is not the best one. So it is necessary to find other effective methods to reduce noise. The reference [acoustic manual] indicates that when the cross-sectional area of the pipe changes, the acoustic impedance Z also changes. Due to the change of impedance, part of the incident sound wave will be reflected back to the original pipe at the variable cross-section, so that the incident sound wave will be attenuated and play a role of noise elimination. In the exhaust system of the slide valve vacuum pump, the air flow section changes many times from the exhaust hole of the pump chamber to the exhaust pipe of the oil tank. If this kind of noise elimination performance of the variable cross-section pipe is reasonably utilized, the impact noise of the slide valve vacuum pump can also be effectively reduced.

Because of the special structure of the exhaust system of the slide valve vacuum pump, it can be simplified as two series resistance silencers. In the design, the upper part of the gas baffle and the oil tank are taken as two expansion chambers. According to the low frequency dominant frequency in the noise of the slide valve vacuum pump, the length of the two expansion chambers is designed respectively, which can effectively reduce its noise. At the junction of the two expansion chambers, the noise of the vacuum pump can be further reduced if the quarter wavelength is used to insert the tube. The preliminary test of h150 slide valve vacuum pump shows that the noise is reduced by 9dba by adopting these two measures.
VACUUM FURNACE

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Water ring vacuum pump in mine

Water ring vacuum pump in mine

Water ring vacuum pump system is usually composed of vacuum pump, coupling, air-water separator and pipeline. With the help of the rotating impeller, the water ring vacuum pump makes water or other working liquid form a rotating liquid ring, through which the gas pumped is compressed and discharged to obtain vacuum.

The air in the suction pipe is pumped out by the water ring vacuum pump, so as to form a vacuum in the closed suction pipe and the pump body and generate a negative pressure. Depending on the atmospheric pressure, the water is pumped from the suction pipe to the pump body. The direction of water injection is from bottom to top. With this way of water injection, the vacuum degree of the water suction pipe and the pump body is stable, and the water pressure is put into the water suction pipe and the pump body by the atmospheric pressure, which overcomes the self weight of the water in the water suction pipe and can meet the vacuum degree requirements of the main drainage pump during drainage.
Vacuum Pump In Vacuum Packaging Machine

Liquid Ring Vacuum compressor

Water ring vacuum pump

Classification of common mechanical pumps in laboratory

Classification of common mechanical pumps in laboratory

The commonly used mechanical pump in the laboratory is the rotary vane vacuum pump, also known as the rotary vane pump. It is composed of a stator and an eccentric rotor, mainly composed of stator, rotary vane and rotor.

The rotor is installed eccentrically in the rotor slot of the stator cylinder, which is tightly embedded with two pieces of rotary blades. Under the spring force, it is close to the cylinder wall of the stator, separating the air inlet and the air outlet of the stator into two parts. When the rotor rotates, the space of the air inlet is gradually expanded and the gas is inhaled, and the air space of the exhaust port is gradually reduced at the same time. The inhaled gas is compressed and discharged from the exhaust port, so as to achieve the purpose of vacuumizing. Vacuum pump oil is used as sealing fluid and lubricant for the whole machine and the vacuum pump oil which is not saturated with small vapor pressure.

2xz-2 rotary vane vacuum pump is commonly used in the laboratory, "2XZ" refers to two-stage direct coupled pump, "X" refers to rotary vane vacuum pump, "data behind 2XZ" refers to pumping rate (L / s). The two-stage pump is composed of two working rooms in series. Obviously, the limit vacuum of the two-stage direct coupled pump is better than that of the single-stage pump, which can reach a vacuum degree of about 10-1pa.

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Application of water ring vacuum pump in paper mill

Application of water ring vacuum pump in paper mill

We all know that water ring vacuum pump is widely used. Next, I will introduce the application of water ring vacuum pump in paper mill for you. I hope you like it.

At the end of last century and the beginning of this century, China's national debt investment in the paper industry accounted for a large proportion, and paper mills all over the country rushed to upgrade to a higher level and scale, which greatly promoted the development and production of large-scale water ring vacuum pump. A paper mill in Northeast China transformed a large-scale water ring vacuum pump with a pumping capacity of 400iil3 / min (the largest water ring vacuum pump produced in China at present There are 6 air pumps with a total power distribution of 400KW. It can be said that 50% of the large-scale water ring vacuum pumps with a pumping capacity of more than 100m3 / min in recent years are used in the paper industry, and the development trend is increasing.
VACUUM FURNACE

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Installation dimension and description of 2BV water ring vacuum pump

Installation dimension and description of 2BV water ring vacuum pump

Today we are going to introduce to you a very well-known and common 2BV water ring vacuum pump. I don't know how much you know about this. Today, we have prepared the following installation instructions and installation dimensions of 2BV water ring vacuum pump. I hope people from all walks of life can take the time to come and have a look.

2BV water ring vacuum pump and compressor system is composed of vacuum pump (compressor), motor and gas-water separator pipeline.

The working process of the vacuum pump, compressor and gas-water separator is as follows: the gas enters 2BV vacuum pump or compressor through the pipeline, then enters the gas-water separator through the exhaust pipe, and is discharged through the exhaust pipe of the gas-water separator. When used as a compressor, the gas-water mixture discharged by the compressor is separated in the gas-water separator, and the gas is delivered to the system requiring compressed gas through the valve. The working water in the 2BV water ring vacuum pump or compressor is discharged to the vacuum pump for reuse by the air-water separator without cooling, and the rest of the working water is supplemented by the water supply pipe. The size of the water supply is adjusted by the valve on the water supply pipe.

The difference between gas suction and pressure delivery system is only that the internal structure of gas water separator is different. When pumping gas, the pressure at the suction port is lower than the atmospheric pressure, while the pressure at the exhaust port is equal to the atmospheric pressure, and the gas water separator has overflow pipe; when pressing gas, the suction port is under atmospheric pressure (or vacuum state), and the pressure at the exhaust port is higher than one atmospheric pressure. To ensure the gas pressure, the water level of the gas water separator is controlled by the overflow switch.
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Anticorrosion method of water ring vacuum pump

Anticorrosion method of water ring vacuum pump

Water ring vacuum pump is used and pumped, so it can pump out inflammable and explosive gas, in addition, it can also pump out the gas containing dust and water, so it is inevitable that it will be corroded after long use, so how should we carry out anti-corrosion operation when we use it? Let's see the introduction of technical points of anti-corrosion first.

1. For the material application of water ring vacuum pump, apply a thin layer of material first to ensure the bonding and full coverage, and then evenly apply the material to the repair surface to achieve the required repair thickness.

2. It is very important to mix the materials when applying the water ring vacuum pump. Mix them strictly according to the proportion and mix them evenly until there is no color difference.

3. Conduct surface treatment for water ring vacuum pump, thoroughly remove the surface oxide layer, and clean the surface with acetone.

The above is the introduction of the key points of the anti-corrosion technology of the water ring vacuum pump. Because it is isothermal in compressed gas, it is widely used, so we should do a good job of maintenance for it. The anti-corrosion is just one of the above, we operate according to the correct methods.
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Cooler for vacuum pump

Cooler for vacuum pump

In fact, for the work of the vacuum pump, we need to know that when the cooling water volume and temperature of the cooler are insufficient, the cooling water temperature will increase, leading to the reduction of the cooling efficiency. If the excessive temperature is not spread in time, the working fluid temperature will increase, affecting the output. According to our work experience, it is an effective preventive measure to measure the cooling water temperature of the equipment regularly and timely, which can effectively judge the internal state of the water ring vacuum pump and provide reference for the maintenance personnel.

Pay attention to keep the cooler clean at the same time. The vacuum pump adopts plate cooler, and the cooling water is supplied by industrial water, which is affected by different industrial water quality and has different influence on the equipment. When the industrial water quality is poor, it will lead to the fouling of plate cooler, reduce the circulation area of cooling water, thus affecting the overall flow and flow rate of water, resulting in the temperature rise of working fluid. Therefore, the cleaning of the cooler and cooler is directly related to the temperature of the working fluid of the vacuum pump.
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Internal structure of liquid ring vacuum pump

Internal structure of liquid ring vacuum pump

Now the most commonly used way of vacuum pump on the market is water ring vacuum pump. Compared with other working pumps, this kind of pump has the advantage that some vacuum parts can be formed in its working process, which greatly reduces the energy consumption of machinery. Because the vacuum degree of the pump body is directly proportional to the output degree, when the water ring vacuum pump works, its output efficiency is the highest, achieving the best economy of the unit operation, and ensuring the highest working efficiency.

During the operation of the liquid ring vacuum pump, its main parts work together through the coupling. The main working parts inside the pump body are the moving shaft and the impeller. When the equipment is rotated at high speed and centrifugal force is generated in it, the working fluid stored in it will be continuously thrown to the inner wall to form a section inside the pump body, which is approximately equal to the shape of the pump cavity. Due to the uniform centrifugal force, the thickness of each part of the water ring is approximately the same.
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System operation of water ring vacuum pump

System operation of water ring vacuum pump

Don't you know the operation process of the water ring vacuum pump system? Let's explain the working process to you. First, work is done by the condenser. The object of work is the air stored in the equipment to ensure that the internal air pressure of the equipment is lower than the normal atmospheric pressure. The air moving outward enters the vacuum pump when passing through the inlet valve. After filtering structure in the vacuum pump, it is centrifuged Filter. The air and working fluid are separated. The air enters the exhaust pipe through the pipe and is discharged along the exhaust pipe. The working fluid flows back to the inside of the equipment through the special pipe. This is to prevent the working fluid carried by the gas from moving to the outside of the equipment with the gas, resulting in waste of working fluid and excessive resource input.

When the working fluid enters the equipment through the pipeline, ensure that the liquid level in the equipment reaches a stable state. If the water level measured automatically in the equipment does not reach the corresponding standard, the automatic water replenishing valve can be used to replenish water inward to ensure the water level is stable. Since automatic water replenishment is required, the water replenishing valve shall be kept open during the operation of the equipment. This will not affect the water ring positive air pump water cooling and other situations.
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What are the types of water ring vacuum pumps

What are the types of water ring vacuum pumps?

The water ring vacuum pump in use has single-stage, multi-stage and single-stage cascade ejector series connection water ring vacuum pump. The two-stage water ring vacuum pump has a higher limit vacuum than the single-stage water ring vacuum pump, and the suction curve drops flat, so it is suitable for the work situation where a larger suction capacity is still needed under a higher vacuum. The two-stage water ring vacuum pump can also be used as a secondary booster pump for high vacuum pumps such as water vapor jet.

The two-stage water ring vacuum pump is a two-stage impeller connected in series on the same shaft, and the main shaft is directly connected with the driving device. There are two modes of operation when the two-stage water ring vacuum pump is used for vacuumizing the condenser in the power station: under the starting condition of low vacuum, the absolute pressure of the condenser and other vacuum systems is 14665.2pa, which can be operated in one stage; under the normal operating condition of high vacuum, the absolute pressure of the condenser is 5999.4pa, which can be operated in two stages.

The serial vacuum pump used in the power station is to connect a ejector to the inlet of the water ring vacuum pump to improve the suction vacuum. The air is used as working medium, which is ejected from the nozzle at high speed. The ejected gas is drawn out, and then enters the water ring vacuum pump, where it continues to be compressed. Finally, the gas and water are discharged out of the tank.

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Design of vacuum system for coating equipment

Design of vacuum system for coating equipment

At present, the vacuum systems used in various vacuum coating equipment are not only of different structures, but also of different pumping characteristics with different working objects

(1) the main pump of the general vacuum system is the oil diffusion pump. The water-cooled baffle (well) is set above the pump. The front pump of the main pump is a mechanical pump. The working pressure of this system is in the range of 10-2 ~ 10-4Pa

(2) in the ultra-high vacuum system, the vacuum degree of the coating chamber can be increased to more than 10-6pa by adding liquid nitrogen cold trap or titanium pump to the above vacuum system, so the ultra-high vacuum system can be obtained. Because the system still uses oil diffusion pump, there is still oil system.

The cwd-500 is equipped with three pole type: cold cathode sputtering ion pump (jlp-400 type) as the main pump, titanium sublimation pump (st-0.1 type) as the auxiliary pump, and sp-40 molecular sieve adsorption pump as the coarse pumping pump. The system is also equipped with CT-200 built-in plug-in valve, a complete set of front stage vacuum pipeline, baking device, etc. in order to make it easy to exhaust or quickly extract air during baking, the unit can also use a set of mechanical pump and adsorption device as auxiliary front stage pump. The ultimate vacuum of the unit can reach 6.7 × 10-8 PA, and it can be pumped to 1 × 10-5 PA from atmospheric pressure within 1h

A very clean vacuum can be obtained by using the molecular pump system of the coating machine, which is conducive to the improvement of the film quality. The pumping speed of molecular pump is very high, which can shorten the process period. For example, 1200L · S-1 molecular pump is used in the ordinary high vacuum coating machine with a diameter of 500mm. It takes only 18min to pump 3 × 10-4Pa from the atmosphere. It can be seen that the effect is remarkable

(3) the vacuum coating equipment of the cryopump system using the cryopump system has a series of advantages: no selective gas, no hydrocarbon pollution, large pumping rate, low limit pressure, simple operation and convenient operation and maintenance
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Vacuum unit in the requirement of thin oil metal metallurgy

Vacuum unit in the requirement of thin oil metal metallurgy

The process of vacuum system obtaining vacuum is called vacuumizing, also called vacuumizing or exhausting. The volume of gas pumped out per unit time under the specified air pressure is called pumping rate, i.e. pumping speed. It can also be called pump speed, and the unit is L / s. The minimum air pressure that a pump or a vacuum system can reach after exhausting for a long enough time is called ultimate vacuum degree

High vacuum condition is required for thin oil metallurgy. Therefore, a complete set of high vacuum unit equipped with mechanical pump and diffusion pump is often used. The vacuum can be pumped to 10-6pa in series with mechanical pump and booster pump. In order to further improve the vacuum degree, the adsorbent can be put in the working system or a cold well can be installed to absorb or condense the gas that has not been pumped out by the pump. Sometimes, the first level mechanical booster pump and unit are added. In series or parallel connection, to improve the pumping capacity in a certain vacuum range.

In the high vacuum unit, the mechanical pump can reduce the air pressure from one atmospheric pressure, which is called the front stage pump; the diffusion pump can only pump from the lower air pressure to the lower air pressure, which is called the secondary pump. The air pressure at which the secondary pump starts to work is called the pre vacuum or pre vacuum. The best pumping speed of each kind of vacuum pump is corresponding to a certain inlet pressure. Therefore, it is necessary to allocate a reasonable vacuum unit in order to obtain the best vacuum efficiency. An unreasonable configuration will not only cause waste, but also cause the vacuum degree of the air system to fail to meet the expected requirements.

The reasonable configuration of vacuum unit should solve the following main problems:

1) select the type of main pump, determine the pipeline and select the vacuum components according to the requirements of the gas volume, working pressure, the limit of the vacuum degree and the pumping time generated by the vacuum equipment;

2) after selecting and matching the main pump, calculate the pumping time and pressure of the vacuum equipment;

3) understand the relationship between the parameters of vacuum pump and the passing capacity of conduit

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What is the discharge pressure of vacuum pump

What is the discharge pressure of vacuum pump?

When the vacuum pump is working, it will continuously exhaust the air from the pump body to form the vacuum degree required by the work at the suction port, that is to say, the exhaust pressure is another main factor affecting the operation efficiency of the water ring vacuum pump.

The exhaust pressure will have a huge impact on the suction capacity and the power consumption of the shaft operation of the vacuum pump. When the vacuum pump system is running, if its exhaust pressure is greater, the suction capacity of the vacuum pump will be smaller, and the power consumption of the corresponding shaft operation will be greater. On the contrary, when the exhaust pressure of the system is smaller, the suction capacity of the vacuum pump will be larger, and the power consumption of the corresponding shaft operation will be smaller.

Therefore, in the actual operation and maintenance process, the exhaust pressure data of the vacuum pump system should be observed in real time. In case of abnormal exhaust pressure data, corresponding measures should be taken immediately to update and reconstruct the whole vacuum system, so that the exhaust pressure of the vacuum system can be maintained in the range of national standards or recommended by the manufacturer for a long time, and the vacuum pump can always be in the optimal working condition Effectively improve the overall operation mechanical efficiency of water ring vacuum pump.

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Features of stainless steel vacuum pump

Features of stainless steel vacuum pump

The application range of stainless steel vacuum pump is very wide, which is inseparable from its own use advantages. As a mechanical equipment, the vacuum pump generally needs to master certain use knowledge in the process of use. In order to better understand the mechanical knowledge, let's introduce its characteristics.

1. Stainless steel vacuum pump has single stage and single action, axial air inlet and exhaust, simple structure and convenient maintenance.

2. Equipped with automatic drain valve to control the starting liquid level of the pump to avoid overload starting.

3. The packing gland is divided into half structure, which can be removed as a whole, making it more convenient to replace the packing.

4. The axial and radial loads of the stainless steel vacuum pump are respectively borne by two different groups of bearings. The improved bearing structure ensures the long-term continuous and reliable operation of the pump.

5. Ordinary materials can meet the general use requirements.

6. When the over-current parts are made of stainless steel of different brands, they can meet different anti-corrosion requirements.

The features of the stainless steel vacuum pump are introduced here. In fact, when using the equipment, you should operate reasonably according to the actual situation, give full play to the use performance of the equipment as much as possible, make use of the advantages of the equipment to ensure the efficiency of the work, and also pay more attention to the daily maintenance work.

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How to cool down roots vacuum pump unit

How to cool down roots vacuum pump unit

If the roots vacuum pump unit is operated for a long time in use, it will easily cause temperature rise, and if the temperature is too high, it will cause the stable performance of the machine to get worse. Therefore, we need to check the operation of the machine in time, and reduce the excessive temperature. Let's teach you how to cool it.

1. If roots vacuum pump unit is installed indoors. Air conditioning can be installed if possible. Don't be sorry about air conditioning and electricity. Because when the temperature of the motor increases by 10 degrees, the life of the motor decreases a lot. Therefore, indoor air conditioning can not only prolong the service life of the equipment, but also reduce the outlet temperature.

2. There are requirements for noise in some places. Roots vacuum pump unit is equipped with acoustic cover. In summer, the door of the acoustic cover must be opened. The sound insulation cover forms a closed space, which increases the ambient temperature, resulting in the high temperature of the intake air and the high temperature of the outlet. Many of the roots fans with acoustic hoods have an inlet temperature of more than 45 degrees in summer.

3. Install a water tank (especially suitable for air blowing and aeration of aquaculture, sewage treatment, etc.) at the place about 5-10 meters away from the pipeline outlet of Roots vacuum pump unit, which can reduce the outlet temperature.

4. Reduce pipeline bends, etc., and reduce pipeline pressure loss and other pressure losses as much as possible.

The above is how to reduce the temperature of Roots vacuum pump unit. You must also have a certain understanding. In fact, we should pay more attention to the operation of the machine in the process of use. Once there is a problem, we should repair it in time, and don't wait for the problem to be serious to deal with it, so as to greatly reduce the failure rate of the machine.

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Working principle of water ring vacuum pump

Working principle of water ring vacuum pump

The working principle is an understanding of the operation mode of the equipment for the use environment and operation mode. If there is no good understanding of its working principle when using the water ring vacuum pump, it is likely to affect its normal use efficiency in use.

Water ring vacuum pump (water ring pump) is a kind of crude vacuum pump. The limit vacuum it can obtain is 2000 ~ 4000Pa, and the series atmospheric ejector can reach 270 ~ 670pa. Water ring pump can also be used as compressor, which is called water ring compressor. It belongs to low-pressure compressor, and its pressure range is 1 ~ 2 × 105Pa gauge pressure.

At first, water ring vacuum pump was used as self absorption pump, and then gradually used in many industrial sectors such as petroleum, chemical industry, machinery, mining, light industry, medicine and food. In many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture return and vacuum degassing, water ring vacuum pump has been widely used. With the rapid development of vacuum application technology, water ring vacuum pump has been paid more and more attention in the aspect of obtaining crude vacuum. As the gas compression in the water ring vacuum pump is isothermal, it can pump out inflammable and explosive gas, as well as the gas containing dust and water. Therefore, the water ring vacuum pump (referred to as water ring pump) is a kind of crude vacuum pump. The limit vacuum it can obtain is 2000 ~ 4000Pa, and the series atmospheric ejector can reach 270 ~ 670pa. The application of water ring vacuum pump is increasing day by day.

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Anti corrosion performance of water ring pump

Anti corrosion performance of water ring pump

Water ring pump is widely used with complete specifications and strong adaptability. Ordinary material pumps can meet most of the use requirements, but due to the different nature of materials, some working conditions have higher requirements on the anti-corrosion performance of pumps, so the pumps need to be made of anti-corrosion materials, let's understand this aspect:

1. According to the vacuum degree and corrosiveness of the pumped gas, the material configuration of water ring pump can be divided into three categories:

(1) class B material, cast iron carbon steel common material;

(2) class E material, 304 stainless steel medium grade material;

(3) class H material, 316 stainless steel high-grade material.

2. According to different anti-corrosion requirements, the flow passage parts of water ring pump can be made of stainless steel of corresponding brand, or the user can select materials as required. When the pump body is lined with rubber, the corrosion resistance of the pump body can be improved. When the flow passage parts are sprayed with special materials, the smooth spraying surface can avoid the retention of impurities and improve the hydraulic efficiency of the water ring pump.

The main parts of the water ring pump can meet the strict anti-corrosion requirements after anti-corrosion treatment or manufacturing with anti-corrosion materials.

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How to solve the problem of screw vacuum pump unable to start

How to solve the problem of screw vacuum pump unable to start

When the screw vacuum pump fails to start, do not tamper with it to avoid greater failure of the equipment. Seek professional personnel for maintenance in time. However, the specific reason for the screw vacuum pump's sudden failure to start is not clear, so find the root cause to solve so as to avoid this situation again.

Screw vacuum pump is a kind of suction and exhaust equipment, which uses a pair of screws to make synchronous and high-speed reverse rotation in the pump shell. It can pump out gas occasions with a large amount of water vapor and a small amount of dust.

1. If the screw vacuum pump is stuck during the first pump test and cannot be started and operated, it is generally considered whether there are metal foreign matters (such as screws, welding slag, etc.) falling into the pump during the pipeline connection and installation, which cause the pump to be stuck and cannot be started and operated.

2. During normal use, the pump can't be started again after shutdown, generally because the condensed materials in the extracted gas stay in the pump body and solidify under normal temperature, resulting in the adhesion between the two rotors and between the rotor and the pump body, or because too much dust in the extracted gas stays in the pump body to squeeze the rotor and can't rotate.

3. If the vacuum pump can not be started and operated, generally do not disassemble the pump body first. If there is any foreign matter, try to manually reverse and take out the foreign matter. After using the pump, try to use solvent dissolution treatment. If it is impossible to solve, consider disassembling the pump body for cleaning.

In order to solve the problem that the screw vacuum pump cannot be started, it is also necessary to prevent the screw vacuum pump from being unable to start and operate. First of all, it is necessary to ensure that no foreign matters fall into the pump body during the installation. When there is dust and condensed material gas pumped out, purging measures are required.

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Suction requirements of stainless steel vacuum pump

Suction requirements of stainless steel vacuum pump

Stainless steel vacuum pump can be used to pump air to reduce the pressure, but what is its pumping?

Combine the pump correctly. Due to the selective pumping, sometimes a stainless steel vacuum pump can not meet the pumping requirements. Several pumps need to be combined to supplement each other to meet the pumping requirements. For example, the titanium sublimation pump has a very high pumping speed for hydrogen, but it can't pump helium, while the three pole sputtering ion pump (or the two pole asymmetrical cathode sputtering ion pump) has a certain pumping speed for argon, and the combination of the two will make the vacuum device get a better vacuum degree.

In addition, some stainless steel vacuum pumps can't work under atmospheric pressure and need pre vacuum; some stainless steel vacuum pumps need pre pump because the outlet pressure is lower than atmospheric pressure.

To sum up, several stainless steel vacuum pumps are needed to be combined to improve the pumping efficiency.
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