Vacuum pumps are devices that take place, improve and vacuum in a variety of closed spaces. Vacuum pumps can be defined as: chemical or physicochemical means of pumping the container to obtain vacuum equipment or equipment. With the development of vacuum application, many kinds of vacuum pumps have been developed. Their pumping speed has risen from zero to hundreds of thousands and millions of liters per second. According to the working principle of vacuum pump, vacuum pump can be basically divided into two types, namely gas transmission pump and gas trapping pump. With the increasing demand for pressure scale in the field of vacuum application technology and scientific research, most of them need to be pumped together by several vacuum pumps, because the operation scale of vacuum application is very wide, so the operation pressure scale of vacuum pumps can not be thorough and can only depend on it. According to different requirements of operation, vacuum pumps are used.
In order to use conveniently and meet the needs of various vacuum technology processes, liquid ring vacuum pumps sometimes combine various vacuum pumps according to their functional requirements to operate in unit type. Operating principle of various vacuum pumps Water ring vacuum pump/liquid ring vacuum pump Operating principle Water ring vacuum pump is a rough vacuum pump, liquid ring vacuum pump can also be used as a compressor, known as water ring compressor, is attributed to low pressure compressor.
liquid ring vacuum pumps are used as Self-suction pumps at the beginning, and then gradually used in many industrial sectors such as petroleum, medicine and food. In many technological processes of industrial production, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture regain and vacuum degassing, liquid ring vacuum pump has been widely used. Because of the rapid development of vacuum, the liquid ring vacuum pump has always been the focus of attention. Because the gas in the liquid ring vacuum pump is isothermal, it can extract flammable and explosive gas, in addition, it can also extract dust, therefore, the use of liquid ring vacuum pump is increasing. Water is used as the working fluid in the pump body. When the impeller rotates clockwise in the figure, the water is thrown near by the impeller. Because of the effect of centrifugal force, the water constitutes a closed ring which is determined by the approximate equal thickness of the pump. The lower part of the water ring is tangent to the impeller hub, and the upper part of the water ring touches the top of the blade.
At the moment, the shape space between the water rings of the impeller wheel is formed, and this space is divided by several small cavities of the impeller blade. It is connected with the suction port on the end face. At the moment, the gas is absorbed. When the suction ends, the small cavity is blocked from the suction port. When the impeller continues to rotate, the small cavity becomes smaller and larger, which makes the gas compressed. When the small cavity is connected with the exhaust port, the gas is discharged from the pump.
In summary, the liquid ring vacuum pump relies on the change of the volume of the pump chamber to complete the suction, contraction and exhaust, so it belongs to the variable volume vacuum pump. The pressure at the inlet of the pump is greater than that in the space A, so the gas is inhaled. When space A is blocked from the suction port, that is to say, it turns to the direction of space B. The gas is compressed at the beginning and finally communicates with the exhaust port. When the compressed gas exceeds the exhaust pressure, the exhaust valve is pushed open by the compressed gas, and the gas is discharged into the atmosphere through the fuel tank. By the pump’s continuous work, arrive at the intention of successive pumping. If the discharge is transferred to another stage, it is pumped out by the low vacuum stage, and the atmosphere is compressed by the low vacuum stage, which constitutes a two-stage pump. At this time, the total load is higher than the two level, so the ultimate vacuum degree is increased.
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