Compressor with two-grade scroll structure

Abstract

The invention discloses a compressor with a two-grade scroll structure. The compressor comprises a shell; a transverse straight driving crankshaft is arranged in the shell; a bearing support I is mounted at one end of the bearing crankshaft; a fixed scroll I and a movable scroll I are mounted on the outer side of the bearing support I; a rotation preventing mechanism I is mounted between the movable scroll I and the bearing support I; a bearing support II is mounted at the other end of the driving crankshaft; a fixed scroll II and a movable scroll II are mounted on the outer side of the bearing support II; a rotation preventing mechanism II is mounted between the movable scroll II and the bearing support II; a high/low-pressure isolation plate is mounted on the outer side of the fixed scroll II; two ends of the shell are sealed through end covers to form a closed cavity; and two cavities separated by the high/low-pressure isolation plate respectively communicate with an intake pipe andan exhaust pipe. The operation range of the compressor is widened; the efficiency of the compressor is improved; and in particular, under low-temperature working conditions, two sets of scroll and support structures are adopted to share the load of the compressor, so that the life of the compressor is greatly prolonged, and the operation reliability of the compressor is greatly improved.

Description

Technical field: [0001] The invention relates to the field of scroll compressors, and mainly relates to a compressor with a double-stage scroll structure. Background technique: [0002] With the increasingly wide application of scroll compressors, their application range is wider and wider, and the energy efficiency requirements are also higher and higher. It is particularly prominent in the use of household air energy heat pumps and water heaters, while meeting the conditions of heating, air conditioning, and water heaters at the same time. There are many problems in the application of the current scroll compressor structure in this field. Mainly manifested in the following aspects: [0003] 1. High operating load. The outlet water temperature of the heat pump water heater system is above 55 degrees, so the compressor basically operates in an area with a high condensation temperature. Condensing temperature is the main factor affecting the life of the compressor. Under t...

AI Technical Summary

Problems solved by technology

[0005] 3. The operating conditions cannot be met

The compressor cannot operate normally due to the high exhaust temperature. The current common solution is to use liquid injection. The refrigerant in the lost part of the main circuit is directly injected into the middle compression chamber of the scroll to reduce the exhaust temperature of the compressor. The compressor can complete the operation normally, but this method is not beneficial to the energy efficiency of the compressor and reduces the effective refrigerant flow rate. When the evaporation temperature is below -20°C, the energy efficiency value of the compressor becomes very low, or even cannot operate

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