Vertical Screw Vacuum Pump

 How to choose the main pump in vacuum system? 

In the design and calculation of the vacuum system, people call the vacuum pump which directly vacuumizes the vacuum container as the main pump, and the vacuum pump which maintains the pressure of the other pump below the critical pre stage pressure is called the front stage pump. In order to make the vacuum pump in the container to be pumped quickly from atmospheric pressure to the working pressure of the main pump, it is called pre pumping vacuum pump. For a vacuum system, the front stage pump of the system is often used as the pre pumping vacuum pump. The main pump here refers to the selection. In a narrow sense, it refers to the proper matching of the main pump with a reasonable front stage pump. In a broad sense, it includes the selection of the front stage pump and the pre pumping pump.

In order to determine the type of main pump, the first thing to consider is the feasibility and reliability. According to the limit vacuum degree and working vacuum degree (the limit vacuum degree of the main pump is slightly higher than the limit vacuum degree of the vacuum chamber), according to the type of gas to be pumped, the proportion of each gas, and the inclusion of dust in the gas, the true pump empty meeting the process requirements should be selected. When more than two different types of pumps are suitable for the above conditions, it is necessary to select an economically reasonable vacuum pump according to the economic indicators such as initial investment and daily maintenance costs. Then, we compare the environment and other conditions to select the best one. Therefore, it is necessary to start from the whole set of vacuum system and comprehensively consider it. It is not only necessary to make a comparison between vacuum pumps to determine.

Determine the size of the main pump, is based on the vacuum chamber in the work of the required working pressure and the maximum volume of exhaust. The working pressure in the vacuum chamber must be selected within the best pumping speed pressure range of the main pump. In addition, the size of the vacuum chamber and the pumping time should be considered, because if the volume of the vacuum chamber is larger, the pumping speed of the main pump will also increase under a certain pumping time.

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Micro air pump

The essence of vacuum adsorption of micro vacuum pump: after the micro vacuum pump is powered on, the pressure difference between the negative pressure generated at the suction port and the external atmospheric pressure is used to firmly absorb the object through the contact elements such as suction cup, so as to play the role of hanging, fixing and moving objects.

The next process of vacuum adsorption is the release of the object after being absorbed. When it is necessary to release the absorbed object, the pump must be shut down first, and do not continue to vacuum. After the pump is shut down, the object may not fall off immediately, because the pump has a certain pressure holding capacity, and the vacuum will continue to maintain for a certain period of time (the length of time depends on the air leakage of the system).

However, the actual situation is that the current dual-purpose micro air pump, micro vacuum pump and so on, including domestic micro air pump, micro vacuum pump and most of foreign micro air pump and micro vacuum pump, because of the internal process principle and other reasons, only allow gas to flow from the air inlet to the exhaust port in one direction, and vice versa. It is not simple to reverse the motor can change the direction of the air flow, to meet the requirements of the release object.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

What causes will affect the vacuum pump

The low steam pressure and pressure fluctuation have great influence on the ability of vacuum pump, so the steam pressure should not be lower than the required operating pressure, but the structural design of vacuum pump has been finalized, too much improvement of steam pressure will not increase the air extraction and vacuum degree. In addition, in order to ensure that the steam pressure supplied by the boiler is stable, it is better to use a boiler to supply the working steam to the steam jet pump, so that the steam pressure will not fluctuate and the function of the vacuum pump is stable.

Due to the lack of cooling water supply, the condenser will heat up, the sound of air flow will increase, the vacuum degree will drop rapidly, and even the steam will return to the extraction pipe. The condensate has no significant effect in the multistage vacuum pump. The condensate can fully condense the steam. The partial pressure of the water vapor in the discharge pressure of the vacuum pump is necessary to be higher than the corresponding full steam pressure. Therefore, the temperature of the condensate should also be lower than the full temperature under the pressure to ensure the normal operation of the pump body.

When the vacuum pump is in the limit condition, there is little or no water discharged from the first stage. Therefore, the first stage pump has a lot of water discharge, which can be considered as leakage of the system. The common causes of air leakage are: the gasket is not installed, installed incorrectly or damaged, the bolt is not tightened, the flange surface is damaged, the weld has sand holes, and the joint (pressure gauge, vacuum gauge, etc.) is not installed properly.

Nozzle is an important part that affects the function of vacuum pump. There are some problems: wrong installation, crooked installation, blocking, damage, corrosion and leakage of nozzle. No matter what preventive measures are adopted, nozzle blocking is inevitable. On the one hand, the residual iron and welding slag in the steam pipe will block the nozzle; on the other hand, when the vacuum pump system is out of service, the steam pipe is easy to rust, and the rust spots will fall to block the nozzle during use.

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Causes of oil trapped in screw vacuum pump

Causes of oil trapped in screw vacuum pump

Screw vacuum pump in the use of the process, sometimes there will be oil trapped problem, how to solve it?

In order to supply oil continuously, screw vacuum pump requires that the overlap coefficient e of gear engagement is greater than 1, that is, when one pair of gears is not disengaged from engagement, the other pair of gears have entered into engagement. In this way, when the screw vacuum pump has two pairs of gears meshing at the same time, a closed volume is formed between the two pairs of gears' tooth direction meshing lines

When the sealing volume is reduced, the trapped oil is squeezed and the pressure rises sharply, which makes the bearing suddenly subject to a large impact load, and the screw vacuum pump vibrates violently. At this time, the high-pressure oil is squeezed out from all possible leaks, resulting in the power loss of the screw vacuum pump and the oil heating, etc

When the sealing volume increases, because there is no oil supplement, a local vacuum of the screw vacuum pump is formed, which separates the air dissolved in the oil and forms bubbles. After bubbles are generated in the oil, a series of problems such as noise and cavitation of the screw vacuum pump will be caused

The above situation is the phenomenon of oil trapped in screw vacuum pump, which will seriously affect the working stability and service life of screw vacuum pump

In order to solve the problem of oil entrapment, two oil entrapment unloading grooves can be milled on the pump cover of screw vacuum pump. The position of the unloading tank should be such that the trapped oil chamber can be connected with the pressure oil chamber through the unloading tank when it is changed from large to small, and can be connected with the oil suction chamber through another unloading tank when the trapped oil chamber is changed from small to large. The distance between the two unloading tanks shall ensure that the oil pressure cavity and the oil suction cavity cannot communicate at any time.

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Water Ring Pump

Brief introduction of mechanical vacuum pump

A pump that uses mechanical movement (rotation or sliding) to obtain vacuum is called a mechanical vacuum pump. According to its working principle and structural characteristics, mechanical vacuum pump can be divided into the following categories: variable capacity vacuum pump: it uses the periodic change of pump cavity volume to complete the work of the pump. Suction and discharge. A vacuum pump for pumping water. The gas is compressed before leaving the pump room. This type of pump is divided into two types: reciprocating pump and rotary pump.

Reciprocating vacuum pump: reciprocating the piston in the pump room to suction, compress and discharge gas. This product is also called piston vacuum pump. The vacuum degree of this kind of product is usually about 1330pa, and the normal working pressure is 1330pa? 105Pa. It is mainly used for the process of removing air or containing a small amount of condensable gas, and the vacuum degree is not high.

Such as vacuum molding, vacuum concentration, vacuum impregnation, material vacuum transportation and other processes, rotary vacuum pump: This product uses the rotary motion of the rotor components in the pump room to pump, compress and discharge gas. It has the following classification: oil seal vacuum pump: it is a rotary variable displacement vacuum pump, which uses vacuum pump oil to seal the gap between moving parts in the pump and reduce harmful space in the pump.

Such pumps usually have gas ballast. It mainly includes rotary vane vacuum pump, fixed plate vacuum pump, slide valve vacuum pump, cycloid vacuum pump, etc. the vacuum degree of such products is usually about 0.05 to 0.5pa, and the normal working pressure is 0.5 to 103pa or higher. It is mainly used in the process of removing air or containing a small amount of condensable gas and requiring high vacuum.

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Characteristics of Roots vacuum pump

The positive exhaust blower can be used in series with the vane pump to obtain a higher pumping speed and lower ultimate pressure under medium vacuum than when the vane pump is used alone. Roots pumps, or roots blowers, consist of a pair of cocoon shaped rotors mounted on two parallel shafts. The clearance between the rotor itself and between the rotor and the pump housing is typically about 0.2mm. The two rotors rotate synchronously in reverse from 3000rpm to 3500rpm. Since the clearance between the rotor and the pump casing is not sealed by oil, such a speed is feasible.

The compression ratio of roots pump, or the pressure ratio of the inlet and outlet of the pump, is related to the pressure, and its maximum value is usually close to 100Pa. At a higher pressure, the compression ratio of the pump is smaller, which is due to the increase of the conductance in the clearance with the increase of the pressure. At low pressure, theoretically, the compression ratio should be kept constant, but actually it is decreased. The roughness of the outlet gas and the rotor surface makes the compression ratio loss at low pressure. When the rotor faces the high-pressure side, the gas will be adsorbed on the rotor surface, and when the rotor faces the low-pressure side, part of the adsorbed gas will be released. The maximum compression ratio is 44. The compression ratio of large J pump is higher than that of small pump, because the clearance of large pump is smaller than that of pump volume. The compression ratio of a light gas like nitrogen is 15-20% smaller than that of air. Compression ratio is a static quantity, which is obtained under the condition of zero flow. During the measurement, the air inlet of the pump is sealed and connected with a pressure gauge, and the air outlet is connected with the one-in-one coarse pumping pump, and the whole system is aspirated. Put the gas into the front pipe connecting the roots pump and the vane pump, measure the pressure P (front pressure) at the exhaust port of the roots pump, and measure the pressure P1 at the air inlet. The compression ratio is derived from P / P1.

When using roots pump to exhaust under high pressure, considerable heat will be generated, which will cause the rotor to expand and may damage the pump. In order to avoid overheating, the maximum pressure difference between the air inlet and the exhaust port of roots pump is specified. The maximum pressure difference is generally 1000Pa, but exceeding this value in a short time will not cause damage to the pump. In order to avoid heating, roots pump is connected by means of compression pump or transfer pump.

In the more common way of compressed exhaust, roots pump and vane pump are used in series. The rated pumping speed of vane pump is 5 to 10 times lower than that of roots pump. When pumping from atmospheric pressure, the bypass pipe bypassing the roots pump shall be opened or the roots pump shall be idle. At this time, the mechanical pump is responsible for all air extraction until the pressure of the previous stage is lower than the pressure difference recommended by the manufacturer, then start the roots pump and close the bypass valve. Some roots pumps have this bypass feature on the pump body.

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Water Ring Pump

Exhaust principle of water ring vacuum pump

Water ring vacuum 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.

Water ring pump was first 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 pump is widely used. Due to the rapid development of vacuum application technology, water ring pump has been paid more and more attention in the aspect of obtaining crude vacuum. Because the gas compression in the water ring pump is isothermal, it can pump out flammable and explosive gas, in addition, it can also pump out the gas containing dust and water. Therefore, the application of water ring pump is increasing day by day.

The pump body is filled with appropriate amount of water as working fluid. When the impeller rotates clockwise according to the direction indicated in the figure, the water is thrown around by the impeller. Due to the centrifugal force, the water forms a closed ring of approximately equal thickness, which is determined by the shape of the pump cavity. The inner surface of the upper part of the water ring is just tangent to the impeller hub, and the inner surface of the lower part of the water ring is just in contact with the top of the blade (in fact, the blade has a certain insertion depth in the water ring). At this time, a crescent space is formed between the impeller hub and the water ring, and this space is divided into several small cavities with equal number of blades by the impeller. If the upper 0 ° of the impeller is taken as the starting point, the volume of the small cavity will increase from small to large when the impeller is 180 ° before rotation, and it is connected with the suction port on the end face. At this time, the gas will be inhaled, and when the suction is finished, the small cavity will be isolated from the suction port; when the impeller continues to rotate, the small cavity will change from large to small, so that the gas will be compressed; when the small cavity is connected with the exhaust port, the gas will be discharged out of the pump.

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high speed direct vane vacuum pump Introduction

high speed direct vane vacuum pump Introduction

High speed direct vane vacuum pump, referred to as direct pump. It is a new branch product of rotary vane vacuum pump. The main type is 2XZ high-speed direct vane vacuum pump.

The old rotary vane pump appeared earlier. It is a product with simple structure and wide application. However, the rotating speed of the old rotary vane pump is low, mostly around 400R / min. The belt drive is adopted to reduce the speed, so the volume is large and the weight is heavy. In order to make the pump body small and light, it can be seen from the calculation theory of the pump geometry pumping speed that when the pumping speed is fixed, the main means is to increase the pump speed. The key to improve the speed of vacuum pump is to make the parts directly bearing high speed load adapt to this working condition, that is, the material of pump body and rotor and the structure of rotor should adapt to the working condition after the speed is increased.

The direct vane pump adopts the motor to drive the pump rotor directly, and the speed is increased to more than 1400R / min. In this way, the structure of the pump is compact; the volume is significantly reduced; the weight is reduced; the pumping performance of the pump is improved; the vibration and noise are greatly reduced.

2XZ type direct coupled vacuum pump is a two-stage high-speed direct coupled rotary vane vacuum pump. This pump is the basic equipment used to extract gas from the sealed vessel to obtain vacuum. It can be used alone, and can also be used as the front pump and pre pump of various high vacuum systems.

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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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Screw Vacuum Pump Application

In the process of rapid development through rational application, the characteristics of screw vacuum pump reflect the advantages of new products. In order to enhance the effective driving force of all aspects of its strength, it is necessary to develop the development needs of its overall strength, and combine with the effective promotion of all aspects of product application performance, so as to comprehensively enhance the application ability of products. In order to expand the effective development of its practical performance and enhance the development needs of its equipment practical performance, in order to promote the improvement of application capacity, from the overall level of development to drive the demand strength of performance.

With the improvement of the actual performance of screw vacuum pump and the continuous advancement of its application advantages in all aspects, the comprehensive and effective product development strength can reflect the beneficial application of the overall performance, so as to continuously improve the play of the substantive advantages of the product performance on the basis of reliable product application, combining with the continuous advancement of its strength in all aspects. It reflects the expressive power of application value, thus enhancing the development of its overall superiority strength, and expanding the effective play of practical performance by improving product application.

In order to reflect the superiority level of screw vacuum pump, according to the superiority ability that users do not need, we should enhance the effective performance of all aspects of its development, fully reflect the expressive power of product application value, promote the full play of its overall superiority strength with reliable product application performance, and enhance the full expression of the overall performance of its products.

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rotary vane vacuum pump of Understanding

Rotary vane vacuum pump is a kind of varactor mechanical vacuum pump, which utilizes the rotating motion of the rotor and the vane sliding in the rotor slot to obtain vacuum. When the working fluid is used to lubricate and fill the dead gap of the pump chamber, separating the exhaust valve from the atmosphere, it is commonly known as the oil-sealed rotary vane vacuum pump. Rotary vane vacuum pump is called direct vane vacuum pump, which directly connects the pump to the motor or to the coupling. In each pump, there are single-stage and double-stage. Rotary vane vacuum pump, how much do you know?

In single-stage pumps, the limit pressure and use of pumps are different due to the different structure and parameters. Rotary vane vacuum pump has been widely used and continuously improved. In the aspect of pump structure, in order to prevent oil return during shutdown, some have check valves that can automatically cut off the oil circuit, some have cut-off valves of intake passage, and some have oil pumps and control structures that can automatically cut off the air circuit when the pump opening ballast suddenly shuts down to keep the pump mouth in a vacuum state.

In terms of accessories, there are population filters, dust filters, steam condensation traps and chemical traps for mist eliminators, odor filters, blocking broken glass and other sundries. There are temperature control valves to control pump temperature to improve steam extraction rate and protect pump temperature control water volume. Speaking of rotary vane vacuum pump, in fact, it is very familiar to many people, probably because of its variety and wide distribution. Rotary vane vacuum pump, vacuum pump usually has dry screw vacuum pump.

Water ring vacuum pump, reciprocating vacuum pump, rotary vane vacuum pump and other types. With the development of science and technology, the use of vacuum pump is more and more extensive. Rotary vane vacuum pump uses eccentric rotor to drive vanes, and the volume of different chambers in the pump changes, so that the internal pressure changes. Rotary vane vacuum pump. At present, it is the most widely used vacuum pump, among which the role of vacuum pump oil, another working part product of rotary vane vacuum pump, is also very important. If the quality of rotary vane vacuum pump oil is poor or mixed with impurities, it will scratch and corrode the internal part of the pump with the flow, while the vacuum pump.

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Superior Performance of Oilless Screw Vacuum Pump

Oil-free screw vacuum pump is also a kind of dry pump, its excellent performance has been the consensus of the majority of users, this kind of environmentally friendly product has become the main trend of today's society. In order to achieve the popularization of screw pump faster, domestic manufacturers have accelerated the development and manufacture of screw pump, its superiority has reflected the development trend of this product. It will certainly become a popular product in the domestic industry, and its application will not be lower than the current vacuum pump products.

And the advantages of oil-free screw vacuum pump can be said to be beyond the reach of other products, first of all, the protection of water resources, the pump does not exist the concept of using water, this basic condition to a large extent saves the use of water energy, which is a relatively broad definition of area, and the other performance is to play a considerable role in the environmental protection of enterprises, the meaning of green products. Knowledge has penetrated into every enterprise, which is a necessity of historical development and a concept of product diversification.

The formation of oil-free screw vacuum pump promotes the development of vacuum pump products, at the same time, it strengthens the awareness of environmental protection, leads the whole vacuum field to another development trend, increases the redefinition of products in the market, and also opens up the promotion of development among enterprises, which is conducive to close links between products and enterprises.

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Several Vacuum Pumps in Chemical Industry

1. Several kinds of vacuum pumps commonly used in chemical industry-the common vacuum pumps in chemical industry can be simply divided into variable-volume vacuum pumps and jet vacuum pumps. Variable-volume vacuum pumps are devices that use the periodic change of pump chamber volume to complete suction and exhaust. Reciprocating vacuum pumps, rotary vane vacuum pumps, slide valve vacuum pumps, water ring vacuum pumps and Roots vacuum pumps belong to variable-volume vacuum pumps. Type vacuum pump. Jet vacuum pump is a momentum transfer pump that uses the high-speed jet generated by the pressure drop of Venturi effect to transport gas to the outlet. Water jet vacuum pump, steam jet vacuum pump, steam-water series jet vacuum pump and steam-water combined jet vacuum pump belong to the same kind of jet vacuum pump. 2. Working Principle and Advantages and Disadvantages of Variable Volume Vacuum Pump

(1) Reciprocating vacuum pump, rotary vane vacuum pump, slide valve vacuum pump and Roots vacuum pump inhale, compress and discharge gas by reciprocating motion or rotation of piston. Their advantage is that the vacuum degree of the new pump is relatively high, but the piston is a running part, so the wear of the piston is inevitable. With the increase of maintenance times, the working vacuum degree will continue to decline until it can not meet the production requirements. This kind of pump has the disadvantage of high working noise, high fuel consumption and high failure rate. Generally, it needs to open a spare one, which invisibly increases the cost of equipment investment and operation. In addition, if this kind of pump is used to pump condensable gases such as suction steam, lubricating oil will be emulsified, so it can only be used to suck non-condensable (air) gases, nor can it suck medium with granular shape, which limits its scope of application.

(2) Water ring vacuum pump rotates by an eccentric rotor with multi-blades installed in the pump shell, throwing water into the pump shell to form a water ring concentric with the pump shell, and the water ring and the rotor blades form a volume periodic change, thus inhaling, compressing and discharging gas. It has the advantages of large suction capacity at low vacuum and direct suction of condensable gases such as water vapor. Its shortcomings are low vacuum, inability to suck granular media, high-speed rotation of the rotor is not easy to do anti-corrosion treatment, so it can not suck corrosive media. 3. Working Principle and Advantages and Disadvantages of Jet Vacuum Pump

Jet vacuum pump is a momentum transfer pump that uses the high-speed jet generated by the pressure drop of Venturi effect to transport gas to the outlet. It is divided into water jet vacuum pump, steam jet vacuum pump, steam-water series jet vacuum pump, steam-water combination jet vacuum pump. Jet vacuum pump is widely used in chemical operation because of its wide vacuum range, direct suction of condensable gases such as water vapor and granular media, simple structure, easy operation, small maintenance of non-operating components, energy saving and consumption reduction.

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How to choose the front pump of Roots vacuum pump?

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

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

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

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

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

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

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

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Matters needing attention in selecting liquid ring vacuum pump

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

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

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

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

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

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

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

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

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Water Ring Vacuum Pump Parts

When we first used the water ring vacuum pump, we didn't know much about its parts. Here's a brief introduction to the analysis of the parts of the water ring vacuum pump.

1. Water-ring vacuum pump: the main component that converts electric energy into mechanical energy.

2. Pump seat: It is the main body of the pump and plays a supporting and fixing role.

3. Impeller: The core part of water-ring vacuum pump. It has high speed and high output. The blades on the impeller play a major role. The impeller must pass static balance test before assembly. The inner and outer surfaces of impellers should be smooth to reduce the friction loss of water flow.H-150-Holding-vacuum-pump-for-PVD-coating-machine

Classification of impellers

Open impeller: It is suitable for conveying materials containing a large amount of suspended matter, with low efficiency and low liquid pressure.

Semi-closed impeller: It is suitable for conveying materials which are easy to precipitate or contain suspended particles such as solid particles and fibers, and its efficiency is also low.roots-vacuum-pump-for-metallizing-machine

Closed impeller: It is suitable for transporting clean liquid without impurities with high efficiency.

4. Axis of water-ring vacuum pump: The motor is connected, and it is the main part of transferring mechanical energy.

5. Mechanical seal: a device for preventing fluid leakage by keeping the sticker merged and sliding relatively.vacuum-furnace-desgin

There are many parts of water-ring vacuum pump. We should pay attention to them when we reuse them, so that we can use water-ring vacuum pump for a longer time.

Vacuum Pump in Vacuum Metallurgy

Each operation of vacuum metallurgy needs to meet a certain degree of vacuum, and different operations have different requirements for vacuum.roots-vacuum-pump-manufacturing

Now we have produced a variety of pumps, according to different pumping principles, different characteristics, to achieve different starting and stopping pressure, it is also applicable to a certain range of pressure operation.

Because the pressure of various pumps is different, when the working pressure is low, two or more pumps must be combined to meet the needs.

Gases produced in vacuum metallurgical operations may contain different substances, such as dust, fine metal particles, water vapor, volatile organic compounds, harmful gases, etc. Appropriate measures need to be taken in the pump or pipeline system to ensure smooth pumping, good pumping performance, long service life and no impact on the environment.rotary-vane-vacuum-pump-in-chemical-industry-system

Vacuum Pump Manufacturer

Many customers report that the high energy consumption of the vacuum pump is very serious, which increases the cost. Then the vacuum pump manufacturer introduces the energy saving tips of the vacuum pump:

1. The vacuum pump is installed diagonally to reduce the elbow. Steer the vacuum pump or the volute so that the outlet is facing the pool.

2, shorten the pipeline: remove 1 meter steel pipe, 10 hours can save 0.21 kg of diesel.piston-vacuum-pumps

3, expand the outlet pipe diameter: 4 meters long 10 cm water hose to 15 cm tube, 10 hours can save 0.5 kg of diesel.

4. The filter can be removed when the vacuum pump inlet water can be kept clean.

5. Change the ring and adjust the axial clearance to prevent the impeller ring and axial clearance from being improper. When using, adjust according to the factory instructions of the vacuum pump.

6. Eliminate pipeline blockages in time: Foreign matter left in the inlet pipe, impeller or flow guide shell flow path will reduce the water output.

7, to prevent the vacuum pump intake, into the air, the amount of water will be significantly reduced, should be checked and maintained for each sealing part.

8, the use of coupling direct drive instead of flat belt, can improve transmission efficiency.

9. Eliminate the “anti-aircraft gun” type water outlet, which increases energy consumption.vacuum-pump-manufacturer

vacuum pumps classification

The classification of vacuum pumps is not clear to many laymen. The technical staff of vacuum pumping plant sorted out the complete vacuum degree as follows, hoping to be helpful to everyone. Vacuum pumps can be divided into two categories according to their working principles:rotary-vacuum-pump-in-coal-chemical

I. Gas Conveyor Pump

1. Varistor Pump

Reciprocating vacuum pumps - mainly diaphragm vacuum pumps, piston reciprocating vacuum pumps

(2) Rotary pump

A. Oil seal pump - rotary vane vacuum pump, fixed vane vacuum pump, slide valve vacuum pump

B. Oil-free Pumps-Reciprocating vacuum pumps, multistage Roots vacuum pumps, claw vacuum pumps, scroll vacuum pumps, screw vacuum pumps

C. liquid ring vacuum pump - water ring vacuum pump and oil ring vacuum pump

D. Roots Vacuum Pump - General Roots Vacuum Pump and Gas Circulating Cooling Roots Vacuum Pump

2. Momentum transfer pump

A. Molecular Pumps - Vortex Molecular Pumps, Traction Molecular Pumps, Composite Molecular Pumps

B. Jet Pump - Water Jet Vacuum Pump, Gas Jet Pump, Steam Jet Pump

C. Diffusion Pump - Oil Diffusion Pump, Oil Diffusion Booster Pump

2. Gas trapping pump

Molecular sieve adsorption pump, getter pump, titanium sublimation pump, sputtering ion pump, cryogenic pump, condensation pump vacuum-pump-classification

Dry Screw Vacuum Pump Advantages

Dry screw vacuum pump mainly uses a pair of screw. Its characteristic is that the two screw are corrected by fine dynamic balance, supported by bearing and installed in the pump shell. There is a certain gap between screw and screw, so that when dry screw vacuum pump works, there is no friction between them, smooth operation, low noise and no need for working chamber. Lubricating oil, dry screw pump can remove gas containing a large amount of steam and a small amount of dust, the limit vacuum is higher. But the screw pump used in our country mainly depends on imports, and the price is very expensive.

Dry screw vacuum pump, which uses a pair of screw, in the pump shell as a synchronous high-speed reverse rotation of the suction and exhaust effect of the suction equipment. Its advantages make up for the shortcomings of oil-sealed vacuum pump, which we all call the upgraded version of oil-sealed vacuum pump. But the cost of dry screw vacuum pump is also its shortcomings. Next, it mainly introduces its advantages and disadvantages:rotary-vane-vacuum-pump-in-petrochemical-industry

Dry Screw Vacuum Pump Advantages：

1. The working chamber and the surface of the screw rotor are coated with anticorrosive coating, which can adapt to harsh working conditions.

2. Gas is not compressed in the pump, so it is suitable to extract condensable gas.

3. No fuel consumption, no drip and leakage

4. The structure is simple and easy to maintain. screw-vacuum-pump-in-metallurgical-industry

5. The pumped gas is directly discharged from the pump body, which does not pollute water, has no environmental protection pressure and makes gas recovery more convenient.rotary-vacuum-pump-application