Air conditioning unit

Abstract

The invention provides an air conditioning unit comprising a compressor, a second heat exchanger, a first heat exchanger, a first connecting pipe, a first expansion valve, an economizer and a second expansion valve. The second heat exchanger and the first heat exchanger are connected with the compressor respectively and further connected with the first connecting pipe. The first expansion valve, the economizer and the second expansion valve are sequentially connected on the first connecting pipe. The compressor is a second-level compressor or a multi-level compressor and connected with the economizer. The first expansion valve is arranged between the first heat exchanger and the economizer. The second expansion valve is arranged between the second heat exchanger and the economizer. The air conditioning unit further comprises a second connecting pipe and a third expansion valve. The second connecting pipe is connected with the second heat exchanger and the first heat exchanger. The third expansion valve is adjustable and sequentially connected on the second connecting pipe. According to the arrangement, by adjusting the third expansion valve, the air conditioning unit is adjusted, coolants directly reaches to the second heat exchanger (the first heat exchanger) through the third expansion valve, adjusting speed is improved, and operation performance of the air conditioning unit is improved. The invention further provides another air conditioning unit.

Description

technical field [0001] The invention relates to the technical field of air conditioning, and more specifically, to an air conditioning unit. Background technique [0002] With the advancement of technology, the performance of air conditioners has gradually improved. At present, in order to improve cycle efficiency, two-stage or multi-stage compression with intercooling is used, and intercooling is usually implemented by an economizer (or flasher). Take the two-stage compression refrigeration cycle as an example, such as figure 1 As shown, an economizer (or flasher) is installed on the first pipeline connecting the condenser and the evaporator, and the gas outlet of the economizer (or flasher) is connected to the secondary inlet of the compressor and connected in series to the first The first expansion valve on the pipeline between the economizer (or flasher) and the condenser, the second expansion valve connected in series on the first pipeline and between the economizer (...

AI Technical Summary

Problems solved by technology

However, during the adjustment process, the refrigerant needs to pass through the economizer (or flasher) to reach the evaporator (condenser), resulting in a slower adjustment speed and lower operating performance of the air conditioning unit

[0004] In addition, when the load of the air conditioning unit changes, the two expansion valves need to be adjusted, making the control system of the air conditioning unit more responsible and prone to problems

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