In the design of liquid ring vacuum pump, it is very important to determine the circumferential speed of impeller, because the circumferential speed has a great influence on the performance of vacuum pump, which can be said to be global. Other parameters of vacuum pump, such as critical compression ratio, limiting vacuum degree and efficiency, are closely related to circulation speed. Generally speaking, if the circulation speed is too small, the vacuum pump will not reach the predetermined critical compression ratio, and the limit vacuum will also be reduced, resulting in the narrow working range of the vacuum pump and the increase of the shaft power in the high vacuum area;
On the other hand, if the circulation speed is too high, although the critical compression ratio and the limit vacuum degree of the vacuum pump can be increased, the efficiency of the vacuum pump will be reduced and the shaft power will be increased. In addition, due to the influence of vaporization pressure of liquid ring medium, the critical compression ratio will not increase proportionally with the increase of circulation speed. Therefore, the cycle speed should not be too high. How to choose the circulating speed of vacuum pump reasonably, not only has excellent performance, but also has low energy consumption, which is a problem worthy of discussion in the design of liquid ring vacuum pump.
When the impeller rotates and drives the liquid to rotate to form a liquid ring, the liquid ring, as the boundary of the closed cavity, continuously obtains kinetic energy from the impeller in the suction area. At the large eccentric point of the impeller, the circumferential velocity of the impeller reaches a large value. In the compression area, the gas is compressed in the form of "active cooling", and a part of the kinetic energy obtained by the impeller is transferred to the gas when the force increases, so that the gas pressure increases The working process of liquid ring vacuum pump is actually the process of energy conversion in impeller, liquid ring and gas, which conforms to the energy level street law.
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