A structure and method for adjusting the volume of pressure chamber in two-stage compressor

Abstract

The invention provides a structure for adjusting volumes of pressure cavities in a double-stage compressor. The structure comprises a primary compression unit and a secondary compression unit, a low-pressure cavity is arranged in the primary compression unit, a high-pressure cavity is arranged in the secondary compression unit, and a medium-pressure cavity is arranged between the primary compression unit and the secondary compression unit and connected with an intermediate adjusting cavity through a control valve. When the double-stage compressor is in a refrigeration state, the control valve is opened, and the intermediate adjusting cavity is communicated with the medium-pressure cavity; and when the double-stage compressor is in a heating state, the control valve is closed, and the intermediate adjusting cavity is disconnected with the medium-pressure cavity. The intermediate adjusting cavity is connected with the medium-pressure cavity, and connection and disconnection of the intermediate adjusting cavity with the medium-pressure cavity are automatically controlled through the control valve, so that the double-stage compressor has both good refrigeration performance and heating performance.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a structure and method for adjusting the volume of a pressure chamber in a two-stage compressor. Background technique [0002] At present, the structure of the two-stage compressor is as follows figure 1 As shown, it includes two compression units: a first-stage compression unit 10 and a second-stage compression unit 20. A low-pressure chamber 11 is provided in the first-stage compression unit 10, and a high-pressure chamber 21 is provided in the second-stage compression unit. A medium-pressure chamber 30 is disposed between the two-stage compression units 20 . Wherein, the volume of the medium-pressure chamber 30 is one of the important factors affecting the cooling and heating performance of the compressor. If the medium-pressure chamber 30 with large volume is used, when the compressor is cooling, the pressure and temperature of the refrigerating gas entering the medium-...

AI Technical Summary

Problems solved by technology

In this technical solution, the one-way valve mechanism between the medium-pressure chamber and the high-pressure chamber is automatically opened according to the pressure in the medium-pressure chamber and the high-pressure chamber, so that the second-stage compression unit is in an idling state, and the operation of the second-stage blades is improved. stability; therefore, the volume of the medium-pressure chamber will not change according to the needs of the compressor in the cooling or heating state; at the same time, the high-pressure chamber, as the working unit of the two-stage compression unit, cannot only be used in changing The chamber with the volume of the pressure chamber; therefore, even if this structure is further improved, it is impossible to make the compressor have good cooling and heating performance

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