Multistage refrigeration compressor and middle air supplementation structure thereof

Abstract

The invention provides a middle air supplementation structure of a multistage refrigeration compressor. The middle air supplementation structure comprises an air supplementation mechanism, wherein the air supplementation mechanism comprises a first air inlet channel, a second air inlet channel and a mixing chamber; the first air inlet channel and the second air inlet channel are respectively communicated with the first end of the mixing chamber; the first air inlet channel is connected with an economizer of the multistage refrigeration compressor; the second air inlet channel is connected with an outlet of an impeller of the multistage refrigeration compressor; the second end of the mixing chamber is connected with an inlet of an next grade impeller of the impeller; and an air flow injection included angle between the first air inlet channel and the mixing chamber is 30-90 degrees. According to the middle air supplementation structure of the multistage refrigeration compressor, an air supplementation flow channel is designed to sufficiently and uniformly mix low-temperature refrigerant steam obtained by flashing in the economizer with high-temperature refrigerant steam from certain grade of the impeller, so that the temperature of inlet air entering the next grade impeller of the certain grade of the impeller is reduced, and the efficiency of the compressor is improved.

Description

technical field [0001] The invention relates to the field of refrigerating compressors, more specifically, to a multi-stage refrigerating compressor and an intermediate air supply structure thereof. Background technique [0002] Refrigeration compressors in the prior art (especially centrifugal refrigeration compressors) usually use more than two stages of impellers in order to achieve a higher pressure ratio. Further, in order to improve cycle efficiency, a cycle mode with an economizer is usually adopted. In the cycle, the compression process of the refrigerant is divided into two stages (take the two-stage impeller as an example): first, the low-pressure refrigerant vapor from the evaporator is compressed to an intermediate pressure by the first-stage impeller; then, the vapor is compressed from the economic The low-temperature refrigerant vapor is cooled by the flash of the device, and then enters the next stage impeller for further compression until the condensation pr...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a multi-stage refrigeration compressor and its intermediate gas supply structure, so as to solve the problem of uneven flow of refrigerant vapor inside the secondary impeller of the multi-stage refrigeration compressor and low efficiency of the compressor in the prior art

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