Two-stage compressor with built-in economizer

Abstract

The invention discloses a two-stage compressor with a built-in economizer. The two-stage compressor comprises a shell. A transverse and straight drive crankshaft is arranged in the shell. A pump assembly I is mounted at one end of the drive crankshaft, a pump assembly II is mounted at the other end of the drive crankshaft, and a high pressure and low pressure isolating plate is mounted on the outer side of the pump assembly II. The two ends of the shell are sealed through an end cover I and an end cover II to form a closed cavity. The high pressure and low pressure isolating plate partitions the cavity into a cavity body I and a cavity body II. The cavity body I and the cavity body II communicate with an air suction pipe and an air exhaust pipe correspondingly. The position, located in thecavity body I, on the drive crankshaft at the inner side of the pump assembly II is sleeved with the economizer. According to the two-stage compressor provided by the invention, the economizer is located in the compressor, the system space is not occupied, and the problem that an economizer in the prior art occupies a space independently is solved; and the economizer is located in the compressor,the inside and outside pressure difference of the economizer is small, pipes with smaller thicknesses can be selected, and the heat exchanging efficiency is improved on the basis that the cost is lowered.

Description

Technical field: [0001] The invention relates to the field of compressors, and mainly relates to a built-in economizer type two-stage compressor. Background technique: [0002] The application of heat pump water heaters has become more and more widespread in recent years. However, when the pressure ratio is high, the conventional heat pump system has technical problems such as low compressor efficiency and high exhaust temperature, which has become a technical bottleneck for the development of the industry. Two-stage compression systems or cascade refrigeration systems are used The system is an effective way to solve technical problems under high pressure ratio (ie, high temperature difference). However, due to the complexity of the system and cost factors, there is no real two-stage compression (or cascade) heat pump product. After analysis and research, people found that spraying a certain intermediate pressure refrigerant into the airtight cylinder in the compression proc...

AI Technical Summary

Problems solved by technology

[0003] The conventional economizer is a separate component in the refrigeration system, which needs to be placed in a separate space and insulated to prevent it from exchanging heat with the surrounding environment. It is equipped with a special refrigerant circuit, which has a relatively complex structure, takes up a large space, and costs high

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