centrifugal compressor

Abstract

The invention discloses a centrifugal compressor, which comprises a body; a shaft core is arranged on the body, and a thrust flying disc is arranged on the shaft core; Thrust bearing, an air film gap is formed between the thrust bearing and the thrust flying disc; a motor assembly, capable of driving the shaft core to rotate; an impeller, connected with the shaft core; a casing, connected with the body And cover the outside of the impeller, the casing has a first air inlet and a first air outlet; and a heat dissipation air passage, flowing through the air film gap, the heat dissipation air passage is in the The inner side of the opening forms a second air inlet, and the heat dissipation air passage forms a second air outlet on the body to communicate with the outside. It can cool the thrust bearing, so that the temperature of the thrust bearing is reduced and the service life is increased, thereby improving the stability and service life of the compressor. At the same time, the cooling process does not increase the energy consumption of the motor and improves the efficiency of the compressor.

Description

technical field [0001] The invention is used in the field of compressors, and in particular relates to a centrifugal compressor. Background technique [0002] Hydrogen fuel cell is a new type of energy conversion device, which can directly convert the chemical energy stored in fuel into electrical energy in the form of electrochemical reaction. It has the advantages of higher energy density, long battery life, and long mileage; it does not need to be charged for a long time. [0003] In order to obtain high power density and performance, hydrogen fuel cells must work under relatively high gas pressure. Therefore, an air compressor with high efficiency and high compression ratio is required to provide high-pressure air for the fuel cell. At present, the compressors used in hydrogen fuel cells mainly include Roots type, scroll type, screw type and centrifugal type. [0004] In comparison, Roots, scroll and screw compressors generally have the disadvantages of large volume, l...

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Problems solved by technology

[0005] When the thrust disc of the centrifugal compressor rotates at high speed, it will continue to generate heat due to wind friction loss, which will cause the temperature of the shaft core and thrust bearing to rise continuously. , the material properties of the shaft core are reduced, the limit speed of the shaft system is reduced, and the high temperature of the thrust bearing will cause the coating to be easily worn, the number of starts and stops will be reduced, and the service life of the bearing will be shortened, which restricts the stability and life of the compressor.

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