Vacuum pump in biogas slag suction car

1. When the vacuum pump exhausts air from the tank and reaches a certain negative pressure for slag suction, the rear valve is usually closed first, and then the vacuum pump is stopped. At this time, there is still a certain degree of vacuum in the tank, and the mechanical oil will be sucked into the tank (visible through the steel wire hose for connection).

2. When the vacuum pump inflates and pressurizes the tank, due to the vehicle running on the field, there must be a shift demand. However, the pump will stop when the clutch is pressed. If the vacuum pump stops running, a large amount of mechanical oil will be sprayed outside.

As the rotary vane vacuum pump needs a certain amount of mechanical oil lubrication and sealing, and the existence of the above two phenomena will lead to the loss of more than 1L of stored mechanical oil, which needs continuous replenishment by operators. In this way, it not only causes great waste of manpower and material resources, but also reduces the work efficiency, even damages the parts of vacuum pump, and also causes certain pollution, which seriously restricts this kind of vehicle To promote the use of.

In order to overcome the above problems, some enterprises use the method of refitting "air compressor" instead of "vacuum pump", but the production cost is greatly increased, and the air compressor body is too large, and the layout is difficult.

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SSR Roots Type Blowers

Dry Type Oilless Vacuum Pumps

Improvement of anticorrosion technology of water ring vacuum pump

1) According to the different requirements of corrosion resistance and cavitation erosion degree of each flow passage component, different process measures are adopted on the substrate made of cast iron, cast steel or carbon steel, which greatly improves the acid resistance, alkali resistance and cavitation resistance, and prolongs the service life. The lining layer of flow passage parts can work reliably within the specified maintenance period under the condition of vacuum degree 3kpa and water and steam scouring. The maintenance cycle is 0.5 ~ 2 years according to the different working conditions such as corrosive medium, temperature and pump speed. Compared with stainless steel, the anticorrosion cost can be reduced by 1 ~ 5 times under the same working conditions and service life.

2) Because the matrix of the vacuum pump parts will not be damaged, when the corrosion-resistant lining fails, it can be repaired repeatedly simply, economically and effectively.

3) It can be used in all water ring vacuum pumps with flat distributor structure, with low cost, long service life and relatively simple manufacturing process. It is suitable for pumping corrosive gases without solid substances in chemical, metallurgical, environmental protection, papermaking, pharmaceutical and other industries.

Water Ring Pump

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Water Ring Vacuum Pump

vacuum pump in gas drainage

Gas accident is the most important thing in coal mining industry in recent years. Dozens of innocent people can be killed in a mine accident. Therefore, the safety of equipment in coal mining industry can not be ignored. There are several basic forms of gas drainage by water ring vacuum pump / compressor

According to the relationship between coal mining and drainage: pre pumping before mining, that is, the drainage of coalbed methane from the undeveloped coal seam. Because the mining area is wide and the pipeline is long, it usually has dozens of kilometers. The working environment is bad, so the water ring vacuum pump / compressor is required to have large air volume, high vacuum degree and reliable operation. Now the water ring vacuum pump / compressor is designed and manufactured with international advanced technology, and the gas volume can reach 500 ~ 70000m3 / h, which can fully meet the needs of coal mining industry. This pumping method has gradually become the mainstream. This method not only becomes the guarantee of safe production, but also becomes a new clean energy, which has strategic significance for China, a big coal country. Pumping while excavating and mining while pumping, that is, CBM drainage in the process of coal seam mining. After mining drainage, namely abandoned mine, mining roadway CBM drainage.

The drainage method is divided into: drilling drainage, drilling coal seam, and using loosening technology to increase the release area and conduction of coalbed methane, so as to make the rapid release of coalbed methane. Reduce the release in the process of excavation. This method has good effect and high utilization rate of coalbed methane. Generally, water ring vacuum pump / compressor is used for pumping. Roadway method drainage, the goaf roadway, mining roadway gas drainage, to ensure the safe concentration. It includes surface vertical well pumping, mixed pumping, etc.


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Vacuum valve used in electronic industry

The valve in the vacuum device is used to separate the parts of the system. According to their working characteristics, they can be divided into pre vacuum valve and high vacuum valve. The diameter of the inlet and outlet of the former is generally about 15-20 mm, which is mostly sealed with vacuum rubber gasket, which is used for the pre vacuum part. The diameter of the latter is 65, 100, 150, 180 mm or more. Metal gasket is used for sealing (especially for valves in ultra-high vacuum part). Only when the limit vacuum is less than 10-6 Torr, rubber seal is used more. They are widely used in the use of materials, brass, steel, stainless steel and other metals, because of the porous casting, so vacuum valves are not casting.

For the valve stem and cover or with the valve body of the main form of sealing, rubber, metal corrugated pipe, film (refers to the valve made of bronze or nickel skin, thickness of 0.1-0.15 mm corrugated film seal, generally its reciprocating stroke of 2-4 mm) is less used.

In the valve hole sealing (refers to the sealing of the closing valve), generally using vacuum rubber. The conical valve disc (made of soft material silver, nickel or brass) and the cylindrical seat (made of quenched steel) is tightly sealed in linear form. Due to its poor durability (such as the valve disc is slightly skewed to the seat, the sealing surface processing is defective, and the valve seat is pressed too tightly, the valve is no longer tight and needs to be repaired). It is only used in ultra-high vacuum. Oil seal and liquid metal seal are not widely used except for some systems with high vacuum requirement and small pipe size.

Dry Type Oilless Vacuum Pumps

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SSR Roots Type Blowers

Shanghai water ring vacuum pump characteristics

Water ring vacuum pump can transport both gas and liquid. It is only in the pumping liquid, the aging rate is low. When conveying gas, it can also be used as a low-pressure compressor, and its discharge pressure is about 0.1-0.2 MPa. The range of displacement is 0.25-30 m3 / min. The vacuum degree can reach 70-80%, while the vacuum degree can reach 99.5% when the manufacturing is excellent.

When the extracted gas should not contact with water, the pump can be filled with oil or other liquid medium (at this time, it is often called liquid ring pump). If oil is used as working medium, the vacuum degree of the first stage and the second stage can reach 99.98% and 99.999% respectively.

The biggest advantage of water ring vacuum pump is that it can pump gas containing liquid. In the use of the vacuum system, there are many conditions in which the inhalation contains liquid in the form of clouds. Even if it contains Yanqi state, it will liquefy in the compression process, and it is not suitable to use general reciprocating pump for such suction. Because the liquid is enclosed between the piston and the cylinder head, the valve and other channels become too narrow due to the existence of liquid. The gas resistance increases, that is, the success rate is lost. And the water ring vacuum pump is originally liquid as the piston, so in the suction containing liquid is completely OK.

Water Ring Pump

Water Ring Vacuum Pump manufacturers

Water Ring Vacuum Pump

rotary vacuum pump overview

The equipment used to generate low-pressure space is called "vacuum pump", which can be generally divided into two types: the former is used to pump 1 atmospheric pressure of gas to a lower pressure, and the latter is used to pump the gas with lower pressure to lower pressure.

There are many types of front stage pumps. In terms of vacuum technology, the performance of the front stage pump is generally required to be:

1. It can pump the gas pressure in a specified container from atmospheric pressure (760 Torr) to about 10-3 Torr;

2. When the pressure is about 1 Torr, the pumping rate is comparable to its maximum pumping rate, that is, it will not fall too much.

Only the rotary vacuum pump can satisfy the two conditions at the same time. In a broad sense, rotating vacuum pump is to use mechanical rotor to expand space to obtain low pressure stock. Generally, it can be divided into rotary vane type, fixed piece type, slide valve type, centrifugal type and straw shoe type (roots pump). However, in general laboratories or industrial units requiring high vacuum, the first two are most commonly used.

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Low vacuum extraction unit

The main features of the low vacuum unit are high working pressure and large exhaust volume, but the pumping speed is lower than that of the high vacuum unit. It is mostly used in rough pumping of vacuum chamber and vacuum conveying, vacuum impregnation, vacuum filtration, vacuum drying, vacuum degassing (molten steel treatment) and other devices with large exhaust volume and high working pressure.

The main pumps of low-vacuum pumping units are commonly used reciprocating vacuum pumps, oil-sealed mechanical pumps, dry mechanical pumps, water jet pumps, water vapor jet pumps, water ring pumps, molecular sieve adsorption pumps, wet roots pumps and other straight-out atmospheric vacuum pumps. To use the low-vacuum extraction unit, the necessary dust collector, water-gas separator, oil-water separator, dry bath trap and other components must be equipped according to the cleaned degree of the exhausted gas, humidity or other special requirements.

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