Double-rotor double-stage compressor and refrigerating/heating system thereof

Abstract

The invention discloses a double-rotor double-stage compressor and a refrigerating / heating system thereof. The compressor comprises a double-stage compression mechanism, a driving motor, a shell, a liquid reservoir, an air suction pipe and a connecting pipe, wherein the driving motor is used for driving the double-stage compression mechanism; the double-stage compression mechanism and the driving motor are arranged in the shell; the double-stage compression mechanism comprises a low-pressure-stage rotor compression mechanism and a high-pressure-stage rotor compression mechanism; the connecting pipe comprises a three-way pipe, and a low-pressure-stage air exhaust pipe, a high-pressure-stage air suction pipe and an injection pipe which are connected with the three-way pipe; an inlet of the liquid reservoir is connected with the air suction pipe, and an outlet of the liquid reservoir is connected with a low-pressure-stage air cylinder of the low-pressure-stage rotor compression mechanism; one end of the low-pressure-stage air exhaust pipe is connected with an air exhaust opening of the low-pressure-stage rotor compression mechanism, and the other end of the low-pressure-stage air exhaust pipe is connected with the three-way pipe; one end of the high-pressure-stage air suction pipe is connected with the three-way pipe, and the other end of the high-pressure-stage air suction pipe is connected with a high-pressure-stage air cylinder of the high-pressure-stage rotor compression mechanism. According to the double-rotor double-stage compressor and the refrigerating / heating system thereof, the aims of realizing double-stage compression, central air supplementation and increase of the enthalpy, reducing the air exhaust temperature and improving the capacity of the compressor are achieved, and a lower bearing structure of the compressor is simplified.

Description

【Technical field】 [0001] The invention relates to the field of refrigeration compressors, in particular to a double-rotor two-stage compressor and a refrigeration / heating system thereof. 【Background technique】 [0002] Under high temperature conditions, the unit work of compressors using R22, R410A and other refrigerants increases, the exhaust temperature is high, and the input power is large. Under ultra-low temperature conditions, the suction mass flow rate of the compressor decreases, the pressure ratio increases, and the discharge temperature is high, all of which are unfavorable to the long-term reliable operation of the compressor. [0003] In order to solve the above problems, Chinese patent application No. 200910178270.0 proposes a dual-rotor two-stage enthalpy-increasing compressor scheme. In this scheme, the gas guided by the flash evaporator is directly injected into the low-pressure stage muffler (that is, the lower bearing flange) to achieve two-stage compressi...

AI Technical Summary

Problems solved by technology

However, the low-pressure stage suction, intermediate air supply and primary exhaust silencer of this scheme are all completed through the lower bearing flange of the double-rotor double-stage compression structure; this makes the lower bearing structure complex and poor in manufacturability; and the low-pressure stage The suction path turns multiple times, and the suction resistance increases; at the same time, the mixed gas of the intermediate supplementary air and the low-pressure stage exhaust is heated by the oil temperature higher than its temperature, resulting in a decrease in the compression efficiency of the high-pressure stage

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