Working principle of oil sealed vacuum pump

The mechanical vacuum pump, which uses vacuum pump oil to keep the seal of moving parts and realizes pumping by changing the volume of pump chamber, is called oil sealed mechanical vacuum pump. 

The working principle of oil sealed mechanical vacuum pump is to make the volume of pump chamber chamber increase and decrease mechanically and pump air. When the volume of the working chamber in the pump chamber becomes the minimum, it is connected with the inlet pipe of the pump, so the gas enters into the suction chamber of the pump until the volume of the suction chamber is maximum and is separated from the air inlet again. When the volume is reduced, the gas is compressed until the pressure of the gas is greater than one atmospheric pressure, and the exhaust valve is opened to discharge the gas. This completes the whole pumping process of oil sealed mechanical vacuum pump.

At present, a large number of mechanical vacuum pumps are widely used, even if the design is the best, the matching accuracy between parts moving in opposite direction is very high. When the pump reaches the limit vacuum, it is difficult to prevent the gas from the low vacuum end to the inlet end. In addition, due to the harmful space in the design, manufacture and assembly of the pump, it also reduces the limit vacuum degree of the pump.

Oil sealed mechanical vacuum pump is to seal the opposite moving parts and exhaust valve parts with oil to fill the harmful space, so that the chances of high-pressure gas reverse "breakthrough" are much less, and the sealing performance is much better, so that the pump can achieve a higher vacuum degree.

Oil sealed rotary mechanical vacuum pump can be divided into fixed plate vacuum pump, rotary vane vacuum pump, slide valve vacuum pump and cycloidal vacuum pump. At present, the mechanical vacuum pump with oil seal is the most widely used pump in domestic vacuum acquisition technology. It can be used as the exhaust pump of low vacuum equipment alone, or as the front stage vacuum pump for high vacuum exhaust. At present, rotary vane vacuum pump is the most popular mainstream product.

Therefore, it has been playing an increasingly important role in many sectors of the national economy, such as electric vacuum, electronics, light chemical industry, iron and steel, nonferrous smelting and other industrial sectors. As these pumps are equipped with gas ballast device, it can also pump out the wet gas. However, it is not suitable for pumping out gases with high oxygen content, explosive, corrosive to ferrous metal, chemical action on pump sealing oil, and gas containing particle dust.


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Difference between self priming pump and booster pump

The main difference between self-priming pump and booster pump is that the self-priming pump has self-priming ability, while the booster pump does not have self-priming capacity. The self-priming pump installed on the pool can suck the low-level liquid into the self-priming pump body, and then transport to other places. If the liquid level is higher than the self-priming pump, the self-priming pump can not be used, and the booster pump can meet the requirements. If the liquid level is higher than the pump, select the self-priming pump Suction pump will lead to the phenomenon of motor over current at the moment of starting the self-priming pump, or the phenomenon of mechanical seal leakage occurs, so do not choose the self-priming pump if the liquid is higher than the pump or the inlet of the self-priming pump has pressure. 

The booster pump is mainly installed on the pipeline, which is used for the place where the pressure of the pipe network is low and the water can not be delivered to the user by its own pressure, or some equipment needs higher pressure, so a booster pump is specially added to boost the pressure. The booster pump does not have the self-priming function, and the liquid must flow into the pump body, so that the booster pump can work Booster pump or all centrifugal pump series are booster pump products. If you want to use a booster pump when the liquid is lower than the pump, you can choose to install a bottom valve at the bottom of the suction port to fill the booster pump and the inlet pipe with water, and the water can be pumped up. However, this effect is not ideal. After the pump is stopped for a long time, the liquid in the inlet pipe will return to the pool and the next start-up needs to be filled with water. The operation is more complicated, so the liquid is lower than the pump, so we still need to build It is suggested that the effect of self-priming pump is better.

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Corrosion resistant high suction self priming pump

In many working conditions, because the suction inside the container itself is negative pressure, a large suction self-priming pump is needed to suck out the liquid in the container. Then the self-priming pump must first consider the vacuum negative pressure higher than the container. For example, the negative pressure value in a container is -0.08mpa. Under this condition, the vacuum degree of the self-priming pump must be higher than-0.09mpa, so it must be considered Select high negative pressure self-priming pump products. 

For example, our self-priming pump with fast water absorption has a negative pressure of -0.09mpa at the inlet. If the container and the pump are installed on the same plane, we can choose the high suction self-priming pump product. However, we should consider the choice of high suction self-priming pump products when the flow rate should be doubled.

For example, if the required flow rate is 2m3 / h, then we should select 4m3 / h self-priming pump when selecting high suction self-priming pump products. It should be noted that if the pump outlet pipeline system is not the same negative pressure, we need to install linkage valve and check valve at the outlet, and then close the outlet valve before starting the high suction self-priming pump, and then open the outlet valve after the high suction self-priming pump runs Just the door. The series of corrosion-resistant high suction self-priming pump materials are mainly divided into various stainless steel materials, PP polypropylene materials, PVDF fluoroplastic materials, Hastelloy steel materials for different working conditions.

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How to adjust the vacuum degree of water ring vacuum pump

Generally, high negative pressure is required in the mine, so the water ring vacuum pump is widely used. However, for the sake of the safety of the vacuum pump, we need to constantly adjust the vacuum degree. Here we will introduce the adjustment of the vacuum degree of the equipment 

1. A valve is added to the air inlet to adjust the opening and closing value of the valve to stabilize the balance pressure of the system.

2. A vent valve is added at the side of the intake pipe to make up air regulation.

3. Control the water supply temperature of water ring pump to adjust the limit pressure.

4. Control the water supply of the water ring pump to adjust the balance pressure of the system.

5. It should be understood that the principle of vacuum pump is to use water jet to take away the air in the container, so as to form a certain degree of vacuum.

6. If the sealing of the container is not good, it is necessary to continuously extract the vacuum. Opening a small water jet valve can reduce the vacuum degree, or add a bypass to adjust the vacuum degree.

7. If the container is well sealed, it can reach the vacuum degree we need, and then it can be removed.

8. If the vacuum pump is always on and the container is well sealed, appropriate vacuum degree is required.

9. In the design, a return pipeline is usually added between the intake pipeline and the exhaust pipeline, and the flow is regulated by adding a regulating valve on the return pipeline to realize the controllable vacuum degree.

Water ring vacuum pump is a vacuum pump used for pumping underground methane. Its vacuum degree regulation is of course important. This equipment is suitable for the mine with small pumping volume and high negative pressure. Through the above adjustment, not only can it be adjusted, but also its service life will be longer.

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Hydraulic requirements of liquid ring vacuum pump

We know that the liquid ring vacuum pump was used as a suction pump in the initial stage. Now most of the media in the field of application are liquid, so we have to deal with water frequently, which makes us have to consider the relevant hydraulic factors, so the following small series will introduce the hydraulic requirements of the pump equipment. 

1. The flow passage of liquid ring vacuum pump is wide, so the passage of large particles should be considered, and the flow capacity should be strong.

2. The flow characteristics of the slurry should be considered at the outlet of impeller and volute for re abrasion.

3. The impeller is usually cylindrical blade. The impeller is designed with front and back blades to reduce leakage and balance axial force.

4. It is designed as concave arc exit. The settling velocity should be considered in the flow velocity of slurry in the channel to prevent solid precipitation and block the flow channel.

The above is the introduction of the four hydraulic requirements of liquid ring vacuum pump. This kind of pump equipment can play a different effect in special environment. If we master its hydraulic characteristics before use, it will be more convenient for the staff to use. Therefore, we must master the above contents.

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Vacuum coating technology of water ring vacuum pump

The vacuum coating of water ring vacuum pump is a kind of technology to produce film material by physical way. This technology can protect the vacuum pump equipment and reduce its damage. However, many people may not understand this, so the following small series to give you a detailed introduction of the product's vacuum coating technology. 

Vacuum coating technology is separated from the heating source to the surface of the pump, so it is also an important branch of water ring vacuum pump application technology. It has been widely used in optics, electronics, energy development, physical and chemical instruments, construction machinery, packaging, civil products, surface science and scientific research and other fields. The main methods of vacuum deposition are evaporation, sputtering, ion plating, beam stacking and molecular beam epitaxy. In addition, there are chemical vapor deposition methods.

If the purpose of vacuum coating is to change the physical and chemical properties of the surface of water ring vacuum pump, this technology is an important part of the surface treatment technology of water ring vacuum pump. This paper introduces its main application. In terms of optics, a piece of optical glass or quartz coated with one or several layers of thin films of different substances can become highly reflective or non reflective (i.e., antireflective film) or any expected proportion of reflection or transmission data, and can also be used as a filter for absorbing certain wavelengths and transmitting for another wavelength.

The high reflective film of water ring vacuum pump is in great demand, starting from large aperture astronomical telescopes and various lasers, to large window coated jasmine of new buildings. Antireflective coatings are widely used in photography, laser start, and large window coated glass of new buildings. Antireflective coatings are widely used in cameras and television cameras. Vacuum coating plays an important role in electronics. Various ranges of inherited circuits. The conductive film, insulating film and maintenance film should be used for memory, arithmetic unit and notification logic element. As a mask for the preparation of the circuit, chromium film is used.

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Pollution prevention of vacuum pump unit

Different vacuum systems require different degrees of vacuum. Therefore, under different operating conditions, it is often necessary to use a set of vacuum units to complete the operation, that is, the vacuum pumps working in different pressure ranges are connected in series. Such as vacuum transportation, vacuum impregnation, vacuum filtration, vacuum monotony, vacuum degassing (liquid steel treatment) and other processes need to use low vacuum pump unit with high working pressure and large displacement. Reciprocating vacuum pump, oil sealed vacuum pump, steam radiation pump, water ring pump and roots pump are commonly used in this kind of low vacuum pumping unit. 

In addition, the application of vacuum pump unit also needs to be equipped with dust remover, monotone tank and other components according to the actual working environment gas cleanliness, humidity or other special environmental conditions.

Due to the complex working environment of vacuum pump unit, after long-term operation, the vacuum degree can not be pumped up, or the vacuum degree can not reach the original limit vacuum level and other faults. This is related to the oil vapor pollution of the vacuum chamber wall and the pollution of various pollutants in the vacuum process.

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