Compression system with second vapor injection function, air conditioning system and judgment and control method of compression system

Abstract

The invention provides a compression system with a second vapor injection function. The compression system comprises a compressor (1), a second vapor injection pipeline (2) and a gulp valve (3) arranged on the second vapor injection pipeline (2), wherein according to the flow direction of a refrigerant, a first pressure detection device (4) and a first temperature detection device (5) are arranged at the inlet end of the gulp valve (3) on the second vapor injection pipeline (2); a second temperature detection device (6) is arranged at the outlet end; and the system further comprises a second pressure detection device (7) and a third temperature detection device (8) arranged on an exhaust pipeline (11) of the compressor (1). According to the invention, whether the second vapor injection of the compressor carries liquid or not and the situations that the vapor injection carries a small amount of liquid and the vapor injection carries a large amount of liquid can be accurately judged, so that the situations that the lubricating oil in the compressor is diluted, the compressor is abrased, and even liquid impact occurs due to the fact that the second vapor injection carries liquid are avoided. The invention further relates to an air conditioning system with the compression system and a judgment and control method.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a compression system with intermediate air supply, an air conditioning system and a judgment control method thereof. Background technique [0002] The lower the ambient temperature, the greater the demand for the heating capacity of the air conditioner. However, the current single-stage compression heat pump can only start and run normally at minus 20 degrees, and the heating capacity is seriously attenuated. The heating effect cannot be guaranteed, and the reliability of the unit is also severely affected. test. [0003] Compared with single-stage compression heat pumps, the two-stage compression system with air injection enthalpy increases the heating capacity at low temperatures and has higher energy efficiency. And the two-stage compression system can reduce the pressure ratio of the single-stage compressor, lower the exhaust temperature, and at the same...

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Problems solved by technology

[0008] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the compression system in the prior art cannot accurately judge whether the intermediate air supply is filled with liquid, thereby providing a compression system with intermediate air supply, an air conditioning system and its Judgment control method

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