Carbon dioxide transcrisis refrigeration circulation rolling rotor energy recovery device

Abstract

The carbon dioxide transcritical refrigeration cycle rolling rotor energy recovery device is mainly composed of a rolling rotor expander, a generator-motor, a casing and a base, etc. The rolling rotor expander and the generator-motor are connected through a coupling. Among them, the rolling rotor expander, coupling and generator-motor are all encapsulated in the casing composed of upper, middle and lower casings. The valve stem below the cam disc is controlled by a cam disc line that rotates synchronously with the eccentric shaft. When the hole above the control stem is opposite the square hole in the seat, the CO 2 The fluid enters the expansion chamber, and the sliding plate rotates to expand and do work. When the present invention is started and running, the generator-motor is used as an electric motor to drive the main shaft of the expander to rotate, overcoming the dead point of the rotor expander; when the rotor expander is in operation, it is used as a generator to convert the output work of the rotor expander For the external output of electric energy. The invention can effectively recover the energy loss in the throttling process and improve the performance coefficient of the whole system.

Description

Technical field [0001] The invention belongs to an energy recovery device in refrigeration, air-conditioning and heating equipment. Background technique [0002] At present, the refrigerants commonly used in the refrigeration and air-conditioning industry are CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons) substances. Because of their destructive effects on the ozone layer and the greenhouse effect, scientists around the world are intensively studying their alternative work. Among them, carbon dioxide has been re-introduced into the refrigeration heat pump industry with its excellent environmental protection characteristics, good heat transfer and flow properties. So in CO 2 Refrigerant is the preferred method to solve CFC replacement. However, to realize CO in industrial technology 2 There are still some difficulties in transcritical refrigeration cycles. The main reason is CO 2 Its throttling loss is larger than that of conventional working...

AI Technical Summary

Problems solved by technology

Using an expander instead of a throttle valve to recover the expansion work can increase the CO 2 system COP, but due to CO 2 The inlet of the expander is a supercritical fluid, and the currently studied CO 2 There are both mechanical and leakage losses in the expander, how to combine CO 2 Characterization of transcritical cycles through rational structural design to enhance CO 2 The efficiency of the expander has become a key issue that needs to be solved urgently to improve the COP

CO 2 The expander can output mechanical work, but it is rarely used. If it is coaxially connected with other energy-consuming equipment such as water pumps, fans, compressors, etc., it is difficult to realize due to problems such as complex structure and difficult speed control and matching.

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