Negative pressure roots blower

Now many customers can't tell what is negative pressure roots blower, what is roots vacuum pump, what is vacuum pump and what is roots blower. They also made some mistakes during the acquisition. Now, to sum up the following points, in Roots blower profession, roots vacuum pump is what most people call negative pressure roots blower. Its principle is the same as roots blower. It belongs to volume reversal blower Machine. 

A reverse compressor which uses two blade rotors to make relative motion in the cylinder to compress and transport gas. The roots blower is simple in structure and easy to make. It is suitable for gas transportation and pressurization in low pressure occasions. Conceptually, roots blower is a kind of usage in vacuum pump. Positive pressure blowing is used with large air volume, which can not be completed by vacuum pump, such as water tank aeration, oxygen supply, powder transportation, etc.

There are several kinds of vacuum pumps, such as water ring vacuum pump, rotary vane vacuum pump, steam jet pump, molecular pump, reciprocating vacuum pump, fixed vane vacuum pump, slide valve vacuum pump, residual cycloid vacuum pump, roots vacuum pump, etc. the principle is to use the skewed rotor in the pump cavity to form the gas discharged from the pump after the volume change of rotation, mainly in the suction process.

When the volume of suction cavity increases, the vacuum degree decreases. When the gas in the container is sucked into the pump cavity, the volume becomes smaller and the pressure increases during the exhaust process. After all, the inhaled gas is discharged out of the pump through the oil seal. In terms of parameters, most of the vacuum degree of the vacuum pump is higher than that of the roots vacuum pump, and the suction volume is also larger than that of other roots vacuum pumps, so the negative pressure can be smaller than that of the roots vacuum pump.


Oil Free Vacuum Pump Selection

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Development of Roots vacuum pump performance

When roots vacuum pump works, rotor and rotor, rotor and pump body are not in contact with each other, so there is no direct wear. However, due to the small clearance (generally 0.10 ~ 0.25 mm), the transmission gear is worn after long-term operation. When the backlash is greater than the minimum clearance between rotors, it will collide and cause failure. At this time, the gear should be replaced. Through the performance of the practical application value ability of Roots vacuum pump, enhance the continuous promotion of the actual development ability of the product, further reflect the development advantage of the product strength with the reliable advantage level, expand the overall improvement of the practical performance, promote the improvement of the actual performance of all aspects of the product, improve the driving force of the practical performance of the product, and make it full use of the value strength of the overall development We should speed up the exertion of the advantage level of its product application, make use of its reliable practical performance, and enhance the embodiment of its product application level. 

At the same time, we should also speed up the improvement of the product advantage level of Roots vacuum pump, expand the exertion of the product application strength and the overall performance level, expand the continuous improvement of the overall application strength of the product, fully reflect the exertion of the product value strength, and further enhance the actual application advantage level with reliable product performance.

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dry vacuum pump structure and characteristics

Vacuum pump is a device or device that uses mechanical, physical, chemical or physicochemical methods to exhaust the pump to get vacuum. Dry vacuum pump users in the application of vacuum pump knowledge need to master the following structure and characteristics, hope to help you. 

The configuration of the vacuum pump body determines the overall structure of the pump. The entrance and exit are arranged in a horizontal and vertical structure for easy assembly and cable connection. However, the center of gravity of the pump is high, the stability of high-speed operation is poor, so this type is used for small pumps.

The horizontal pump is at the suction port and the exhaust port is below. The piping of the vacuum system is easy to install and connect, sometimes it can be discharged from the horizontal direction of the exhaust. That is to say, the exhaust directions are perpendicular to each other. At this time, in addition to the bypass valve at the other end of the exhaust pipe, the exhaust port can also be opened from left to right. The pump structure has low center of gravity and high speed stability. Generally speaking, large and medium pumps use this structure.

The two rotor shafts of the pump are installed perpendicular to the horizontal plane. The structure is easy to control the assembly clearance, the rotor is easy to install, and the pump area is small. However, the center of gravity of the pump is the height and the disassembly of the gear, and the lubrication mechanism is also very complex.

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Rotary Vane Vacuum Pump

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Repair and maintenance of Roots vacuum pump

Roots vacuum pump is an important part of vacuum pump. How to repair and maintain roots vacuum pump?

It is necessary to check the vacuum pump every day, including the oil level, temperature and motor load of the vacuum pump. Ensure that all indexes are under control. If there is any problem, please solve it in a targeted way.

Check the accessories of Roots vacuum pump every month, including tension of V-belt and coupling elastomer.

Every three months, it is necessary to check whether the lubricating oil in the gear box of Roots vacuum pump remains unchanged and replace the deteriorated oil in time.

In the first half of this year, we mainly inspected the quality of lubricant in the seal ring and bearing housing of Roots vacuum pump. If it fails, it must be replaced.

Every year, the overall inspection of vacuum pump, including bearing inspection, is an important factor in maintaining vacuum pump. This is very important. The piston ring bushing is in good condition. The new ring liner should be replaced with severe wear.

Vacuum Pump In Starch Sugar Production

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

How to eliminate noise of vacuum pump

1. If the vacuum pump is in the working state, the vacuum degree indicated by the vacuum meter is about -0.093, it will produce sharp noise (cavitation sound). This is a normal phenomenon, because the vacuum pump itself has a matching cavitation protection pipe to reduce this noise, so as long as the valve is opened, the noise can be reduced. 

2. If the flow rate of working fluid is too large, cavitation noise will also be generated. If the flow rate of working fluid is not the above problem, it is very likely that the intermittent noise caused by friction and impact caused by impurities in the pump body may be caused by the high-speed operation of the impeller. Please repair and maintain it as soon as possible.

3. If the design, manufacture or material are not proper, the vane sliding is not smooth, or the blade head cannot always run close to the cylinder wall due to the existence of exhaust dead gap and incompressible oil, it will cause the impact sound of the vane on the cylinder wall. Therefore, the circular arc structure should be adopted to separate the inlet and exhaust ports. The dead gap is eliminated by the exhaust guide groove.

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Pressure of stainless steel vacuum pump

For the knowledge of stainless steel vacuum pump, I believe you have a certain understanding, in order to have a better use of it, we should understand its calculation method, the following is a brief introduction for you. 

Vacuum degree = atmospheric pressure absolute pressure (atmospheric pressure is generally 101325pa, the ultimate absolute pressure of water ring vacuum pump is 3300pa, and the limit absolute pressure of vane vacuum pump is about 10Pa)

1. Limit relative pressure: the relative pressure is how much lower the measured internal pressure is than the "atmospheric pressure". It shows that the actual value of system pressure is lower than that of atmospheric pressure. As the air inside the container is pumped, the pressure inside is always lower than that outside the container. Therefore, when expressed in terms of relative pressure or gauge pressure, the value must be preceded by a negative sign, indicating that the internal pressure of the container is lower than the external pressure;

2. Limit absolute pressure: the absolute pressure is how much higher the measured internal pressure is than the "theoretical vacuum (theoretical vacuum pressure value is 0Pa)". It compares the absolute vacuum pressure of the theoretical state. Due to the limitation of technology, we can't pump the internal pressure to the absolute vacuum value of 0Pa in any case. Therefore, the vacuum value pumped by stainless steel vacuum pump is higher than the theoretical vacuum value. So when expressed in absolute vacuum, there is no negative sign in front of the value.


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Roots Blowers

Roots Vacuum Pump

Price of series three leaf roots blower

For the series Roots blower, the manufacturer should adjust the belt of the fan to the appropriate tight state before the roots blower leaves the factory, so as to ensure the smooth operation of the fan. The loose belt will not only cause heat, but also fall off and damage. Too tight belt will also lead to belt heating, and will affect the fan linkage, loss in the process of power transmission, and the belt may even break in the process of operation. Therefore, whether it is too loose or too tight is not good. Therefore, fan manufacturers should strictly test all aspects of fan indicators when leaving the factory. 

The belt heating of Roots blower is even more serious in summer. Some customers pour water on the belt in order to cool down the fan belt. In fact, this method is wrong. Although it will lower the temperature of the belt, it will seriously affect the fit of the belt and pulley, reduce friction, and lead to insufficient power transmission and slipping. If the water flows into the fan, it will cause the internal impeller of the fan to rust, and even damage the Roots fan if it goes on for a long time.

API Liquid Ring Vacuum Pump

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Roots vacuum pump with relief valve Installation

1. Roots pump should be installed in dry, ventilated and clean place 

2. Roots pump should be installed horizontally, and the gap between pump and wall or other objects should be kept at least 300 mm. The oil window part of the pump shall be provided with space for easy observation of oil level.

3. When connecting the power supply, pay attention to the rotation direction of the motor. From the tail of roots pump motor, the rotation direction of motor shaft should be clockwise.

Operation steps: turn on the three-phase power supply of the motor, click the start button of the motor to check whether the steering direction is correct. If the steering direction is opposite, replace any two of the three power supply terminals.

4. The pipeline connecting roots pump and pumped vessel shall be clean, dry and free of leakage. The diameter of pipeline shall not be less than the inlet diameter of roots pump as far as possible, and the length shall be short to reduce the loss of pumping speed, and there shall be no leakage at the joint of pipeline.

5. If the extracted gas contains dust or granular substances, a suitable air inlet filter should be installed at the inlet of the pump to avoid damage to roots pump and front stage pump by dust or granular substances. (after the filter is installed, the pumping speed and limit pressure of roots pump will be affected, and the influence degree varies with the structure of the filter).

Water Ring Vacuum Pump And Water Ring Compressor Difference Between

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Noise reduction method 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 high pumping speed, simple structure, reliable function and high vacuum degree, so it has become a product with large demand. However, the primary problem of the pump is that the noise and oscillation are relatively large, which will have a bad impact on the environment of the operating unit, and will damage the service life of the vacuum system. 

Therefore, it is of great significance to improve the noise and function of the slide valve vacuum pump and extend the working life and power. According to the literature [discussion on the noise mechanism of the slide valve vacuum pump], it is known that the main reason for the high noise of the slide valve pump is the impact of oil and gas. In order to reduce the impact noise of the slide valve vacuum pump, the method widely used in China is to reduce the impact by lowering the rotating speed of the slide valve pump. For example, if the rotation speed of h150 slide valve pump is changed from 540r / min to 480r / min, the noise can be reduced by more than 3dba.

However, under the condition of constant pumping speed of slide valve pump, decreasing the speed of pump means increasing the volume of pump, which is obviously not a scheme. Therefore, it is necessary to explore other useful methods to reduce noise. The reference [acoustic manual] indicates that sound is transmitted in the pipeline, and when the cross-sectional area of the pipeline changes, the acoustic impedance Z also changes. At the variable cross-section, due to the change of impedance, part of the incident sound wave will be reflected back to the original pipe, and then the incident sound wave will be attenuated to achieve the effect 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 cavity to the exhaust pipe of the oil tank. Assuming that the sound attenuation function of the variable cross-section pipeline is reasonably used, the impact noise of the underground sliding valve vacuum pump can also be used.

API 681 Vacuum Pump

Rotary Vane Vacuum Pump

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Characteristics of vacuum valve

The bottom features of vacuum valve are high air tightness (firm sealing); the resistance to air flow is as small as possible (i.e. the flow of the valve is fully conducted or large); the wear resistance of the sealing parts is good, which can be reused and has a long life; the valve body information and the amount of gas released from the sealing parts are small; the operation is flexible, simple, and the equipment is easy to clean. In addition, the function is reliable and the repair is convenient. On the ultra-high vacuum valve also required to be able to withstand high temperature baking (450 ℃); for the saving valve, it is required to regulate the gas flow evenly. 

Materials of commonly used vacuum valve bodies are metal and glass. Manual vacuum valve driving handwheel is made of high-strength plastics. Glass vacuum piston, also known as "cork", is generally used in glass vacuum system, small vacuum equipment, vacuum gauge regulation or calibration system. The advantages are simple production, convenient operation, easy cleaning and investigation, good chemical stability and insulation, and less outgassing. The vacuum equipment required by industrial production, such as vacuum coating equipment, vacuum exercise equipment, vacuum heat treatment equipment, space environment simulation equipment, rocket engine simulation equipment, satellite surface charged simulation equipment, particle accelerator and controlled nuclear fusion equipment, heavy duty vacuum equipment are required for industrial production Metal valves are used in particle accelerators.

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Vacuum pump treatment of pollution in vacuum system

 Low vacuum devices such as vacuum transportation, vacuum impregnation, vacuum filtration, vacuum monotony, vacuum degassing (liquid steel disposal) are required to have low vacuum pump units with high working pressure and large displacement. The main pumps of such low vacuum pumping units are reciprocating vacuum pump, oil sealed vacuum pump, steam radiation pump, water ring pump, roots pump, etc. 

According to the cleaning degree, humidity or other special requirements, the low vacuum pumping unit should be equipped with necessary dust remover, monotone tank and other components. During the tightening process, water vapor will condense into water droplets and mix with the pump to form a suspension, which will not only make the vacuum drop, but also rust the pump cavity and rotor, destroy the sealing surface and make the limit vacuum of the pump drop. Therefore, it is very important to prevent water vapor from polluting the mechanical pump.

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Causes of seal damage of multistage vacuum pump

There are two kinds of reasons for the seal damage of multistage vacuum pump: artificial damage and natural damage. The seal of multistage vacuum pump will be damaged by scratch, bruise and squeeze when it is opened and closed. Mechanical damage between two sealing surfaces. Under the action of high temperature and high pressure, atoms permeate each other and cause adhesion. When the two sealing surfaces move with each other, the adhesion is easily pulled and torn. The higher the surface roughness of the sealing surface of the multi-stage vacuum pump, the more easily this phenomenon occurs. 

When the medium is active, the sealing surface of multi-stage vacuum pump is worn, washed and cavitated. The floating fine particles in the medium collide with and offend the sealing surface, causing local damage. The high-speed moving medium directly washes the sealing surface, causing local damage. When the medium is mixed and vaporized locally, the gas generating bubble blasting impacts the sealing surface, causing local damage. Medium erosion and chemical erosion alternate action, will strongly erode the sealing surface.

The potential difference and electrochemical corrosion will occur due to the contact between sealing surfaces, the contact between sealing surfaces and sealing body and valve body, as well as the concentration difference of medium and oxygen concentration, which will lead to the corrosion of sealing surface on the anode side. However, in the case of no current generated by the medium near the sealing surface, the medium directly reacts with the sealing surface, forming chemical erosion and eroding the sealing surface.

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Roots Blowers

Roots Vacuum Pump 

Roots vacuum pump unit operating sequence

 We know that roots vacuum pump needs front stage pump when it is used. Vacuum unit generally includes roots pump water ring pump vacuum unit, roots pump water ring pump large air pump unit, roots pump water ring pump parallel mechanical vacuum pump unit. For the vacuum unit, the operation sequence is more important. 

1. When there is no bypass valve in the unit, the water ring pump should be started first. The gas in the pumping system enters the water ring pump through roots vacuum pump (the gas drives the rotor of roots pump to rotate itself, just like a flowmeter), and then it is discharged into the atmosphere. When the suction pressure of the water ring pump (or the suction pressure of large and medium air pumps, if there are large and medium air pumps connected in series) reaches the original standard value of roots pump (i.e. allowable working pressure of exhaust pipe), roots pump will start and generator set will be announced to operate and start working.

Two When the unit is equipped with a bypass valve, the water ring pump is started first, and then the root vacuum pump is started. At this time, the pressure difference between the root pump and the exhaust gas is large, and the bypass valve is opened automatically. The gas part of the pump enters the water ring pump through the bypass valve, and the other part of the pump enters the water ring pump under the action of the root pump. The air extraction rate is obviously enhanced, so the pre vacuum value of the root pump is quickly reached, and the air pressure difference between the inlet and the exhaust is small, The valve closes automatically (or manually), and the unit works normally. This method can greatly shorten the pre drawing time, but the equipment is more complex.

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Heater and heating power of oil diffusion pump

Compared with the diffusion radiation pump, the pumping capacity and maximum outlet pressure of the oil diffusion pump are much lower, so the heating power of the pump is also lower. The boiler diameter of oil diffusion pump is usually equal to (less than) the diameter of pump port. The heat load of oil diffusion pump boiler with pumping speed greater than 500L / s shall not exceed 2-2.5w/cm2 

In the oil diffusion pump, the power consumed by oil evaporation is usually 60% - 70% of the total power, and other parts are used to compensate for various heat losses. In the diffusion pump, the heat loss mainly includes the following aspects: the heat conduction from the heater surface through the boiler wall to the outside (20% - 25%); the heat transfer from the hot boiler to the cold pump body along the pump wall (10% - 15%); the radiation from the guide pipe surface to the pump wall and the heat transfer from the gas and steam mixture from the guide pipe to the pump wall (5% - 10%). If the pump results are good, the heat loss can be reduced to 10% - 15% of the total power.

For example, the heat loss can be obviously reduced if the heat insulation of pump heater and boiler is stopped. Assuming that there is no air layer between the bottom of the boiler and the heater, the heating power can be well applied.

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Roots Blowers

Roots Vacuum Pump

Energy saving vacuum system

According to the calculation, after recognizing the pumping speed of vacuum pump, it is necessary to carefully consider the type of pump. For example, for the oil sealed mechanical pump with pumping speed of 150L / s, the slide valve pump needs 17kw of driving power, while the cycloid pump only uses 13kw. If the latter is selected for long-time operation, it will save much electric energy, and has small volume, light weight, small oscillation and convenient repair. The transmission power of the direct coupled pump is better than that of the V-belt drive.

Also such as oil laxity pump, oil booster pump thermal power is very low, long starting time, will also consume a lot of energy and time, so can choose low transpiration latent heat oil as working fluid. In the heating system of the pump, the heating power is reduced from 30kW to 20kW, and the pumping effect is the same. Then roots vacuum pump starts quickly, especially suitable for the system with frequent starting. If the oil booster pump or fault expansion pump is selected, the system will not stop the pump during the non operation period, wasting energy in vain. It is also a good way to save energy.

In the vacuum system of roots pump, the pressure difference between the outlet and the inlet of roots pump should not be too large, otherwise it will bring too much power consumption. Because the power consumption of this pump is proportional to the pressure difference. Generally, a small roots pump is connected in series to save power consumption.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Vacuum gauge commonly used in semiconductor operation

The common vacuum gauges in semiconductor industry include resistance vacuum gauge (Pirani vacuum gauge), thermocouple vacuum gauge, capacitance vacuum gauge, electric ion vacuum gauge, cold cathode ionization vacuum gauge and full range vacuum gauge. The cold cathode ionization vacuum gauge can be divided into penning gauge, magnetron gauge and anti magnetron gauge. 

Full range vacuum gauge is a combination of low vacuum gauge and high vacuum gauge; resistance vacuum gauge has wide measuring range and is commonly used; thermoelectric vacuum gauge has narrow vacuum measuring range and simple structure, which is not easy to be damaged; the measurement value of capacitance vacuum gauge is not affected by gas variety; ionization vacuum gauge belongs to high vacuum gauge and will generate heat; cold cathode ionization vacuum gauge belongs to high vacuum gauge, which is not hot and easy to repair; Full range vacuum gauge active range switching, easy to use. 

Most of today's vacuum gauge probes and signal processing circuits work together, which enables anti-interference ability and promotes its miniaturization. Most probes use metal material instead of glass material, which is more robust and delicate. The vacuum gauge display controller also requires miniaturization. Some of them have a volume of 105mmx110mmx250mm and a mass of 1.3KG, with three connectors. Each connector can be connected with a resistance vacuum gauge or a cold cathode ionization vacuum gauge. This intelligent vacuum meter controller is easy to carry and use.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Measurement of pumping rate of Roots vacuum pump

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

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

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

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Principle of Roots vacuum pump with direct exhaust

Roots pump uses the internal cooling method, the heat is directly taken away from the heat source by the circulating cooling air, that is, the extracted gas is cooled by the cooling air when it is compressed or discharged, so this kind of pump can be used to regulate the place where the pump can not operate. 

The pump cavity can be cooled by itself, because there is a special part of the impeller and working chamber. When this special part works, a part of the working chamber is closed, blocking the inlet and outlet. Through the special vent, the cooling gas flows out from the pressure side or enters the operation cavity again, and then fills with the cooling gas with pressure from the outlet side, and the gas circulates in this way.

The air circulation cooling roots pump is controlled by a special impeller head without additional control elements. Therefore, this kind of internal circulation cooling roots pump is the same as ordinary roots pump, with simple and clean structure. It connects the cooler and the exhaust port together, and the cooler is installed outside the pump shell, which is convenient for repair, maintenance and replacement.

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Reducing noise of slide valve vacuum pump

The noise of slide valve vacuum pump is mainly produced by impact. Whether it is the impact of pump oil or mechanical impact, the noise generated is related to the pump speed. With the development trend of pump speed to high speed, this problem is more prominent. 

Compared with steel tank, the noise of cast iron tank can be reduced by (2 ~ 3) dB (a). The main reason is that the structure of cast iron is a little looser than that of steel plate, so it has a certain sound absorption effect. Moreover, the cast iron oil tank is thicker than the steel tank, and the sound insulation effect is better. If a layer of film is sprayed on the inner wall of the oil tank, the effect will be better. The structural shape of the inner surface of the oil tank should be designed to be asymmetric to avoid resonance sound.

The exhaust valve cover is connected with the oil-gas separator, which has the function of sound insulation and noise elimination. If the exhaust valve cover is removed, the pump noise will be much higher. If the oil-gas separator is properly designed, it will also have a certain noise reduction effect. For example, the "secondary cyclone oil-gas separator" designed by us has two collisions through the oil-gas separator in the transmission process, resulting in a certain loss of sound energy, which is conducive to noise elimination.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Principle of pumping liquid by water ring pump

When pumping liquid, the process of suction is the same as that of gas. Because the speed of the sickle increases on the left side of the pump. 

According to Bernoulli's equation, when the speed increases, the pressure will decrease. When the liquid continues to move forward and flows to connect with the pressure outlet, the pressure will suddenly increase. The result of pressure increase makes the liquid passing through the pressure outlet be restrained and slow down. The sudden increase of pressure and deceleration will bring huge hydraulic loss. Therefore, the power of water ring pump in pumping liquid is very low (compared with pumping air) The power should not exceed 15 ~ 20%, because of the huge hydraulic loss and the "water conveyor effect" (when the liquid flows to the pressure outlet area, the liquid flows from the place with large radius to the place with small radius, and the liquid transfers its own energy to the impeller, just like the water conveyor), the lift is much smaller in practice. The head of water ring pump is smaller than that of centrifugal pump of the same scale.

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