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Two-stage compressor heat pump and oil return control system and method thereof

A two-stage compressor, oil return control technology, applied in compressors, heat pumps, refrigeration and liquefaction, etc., can solve the problem of uneven oil return of compressors, achieve uniform oil return, improve life, and prevent cylinder block wear.

Active Publication Date: 2017-05-31
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of uneven oil return between compressors in the two-stage heat pump system in the prior art, thereby providing an oil return method and an oil return control system for a two-stage compression heat pump

Method used

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  • Two-stage compressor heat pump and oil return control system and method thereof

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Embodiment 1

[0071] Such as figure 1 As shown, the present invention provides a two-stage compressor heat pump, which includes indoor and outdoor heat exchangers 5, 10, a low-pressure compressor 1 and a high-pressure compressor 2, and the exhaust port of the low-pressure compressor 1 passes through a medium-pressure pipe The road 17 communicates with the suction port of the high-pressure compressor 2, and an oil separator 3 is also connected to the exhaust end of the high-pressure compressor 2, and the oil separated by the oil separator 3 passes through the oil return pipe The road 18 is branched into two roads, one road is connected to the suction end of the low-pressure compressor 1 through the low-pressure oil return pipeline 19, and the other road is connected to the medium-pressure pipeline through the high-pressure oil return pipeline 20 and then connected to the high-pressure compressor 2 Suction end. (What needs to be explained here is: the low pressure, medium pressure and high p...

Embodiment 2

[0079] In this embodiment, on the basis of Embodiment 1, a first one-way valve 13.1 that only allows fluid to flow toward the suction port of the low-pressure compressor 1 is provided on the low-pressure oil return line 19;

[0080] And / or, a second one-way valve 13 .

[0081] By setting the above-mentioned first one-way valve on the low-pressure oil return line, the fluid (including oil and refrigerant) can only flow from the oil separator to the low-pressure compressor, effectively preventing the refrigerant or oil from flowing back from the low-pressure compressor , setting the above-mentioned second one-way valve on the high-pressure oil return pipeline can make the fluid (including oil and refrigerant) only flow from the oil separator to the low-pressure compressor, effectively preventing the refrigerant or oil from returning from the high-pressure compressor , Effectively guarantee the normal operation performance of high and low pressure compressors.

Embodiment 3

[0083] In this embodiment, on the basis of Embodiment 1 and / or 2, preferably, an oil equalizing pipeline 21 for equalizing oil between the low pressure compressor 1 and the high pressure compressor 2 is further provided in communication ,

[0084] And the oil equalizing pipeline 21 is also provided with an oil equalizing valve 14; and / or, the oil equalizing pipeline 21 is also provided with a third one-way valve that only allows fluid to flow from the low pressure compressor 1 to the high pressure compressor 2 Valve 13.3.

[0085] Through the structural form of an oil equalizing pipeline and an oil equalizing valve between the high and low pressure compressors, the oil can be distributed between the two compressors, especially the oil from the low pressure compressor can be lifted. The amount of oil entering the high-pressure compressor (because the amount of oil in the low-pressure compressor is usually greater than that in the high-pressure compressor), so that the oil cont...

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Abstract

The invention provides a two-stage compressor heat pump and an oil return control system and method thereof. The two-stage compressor heat pump comprises an indoor heat exchanger, an outdoor heat exchanger, a low-pressure compressor (1) and a high-pressure compressor (2), wherein the exhaust opening of the low-pressure compressor (1) communicates with the intake opening of the high-pressure compressor (2) through a medium-pressure pipeline (17); the exhaust end of the high-pressure compressor (2) is also connected with an oil separator (3); oil separated by the oil separator (3) is divided into two paths through an oil return pipeline (18); one path is connected to the intake end of the low-pressure compressor (1) through a ow-pressure oil return pipeline (19), and the other path is connected to the intake end of the high-pressure compressor (2) through a high-pressure oil return pipeline (20). According to the two-stage compressor heat pump, oil returning can be separately performed on the low-pressure compressor and the high-pressure compressor as required to ensure uniform oil return of both the low-pressure compressor and the high-pressure compressor; and the phenomenon of abnormal stall caused by wear of a cylinder is effectively prevented, the service lives of the compressors are prolonged, and the performance of the heat pump is improved.

Description

technical field [0001] The invention belongs to the technical field of air-conditioning heat pumps, and in particular relates to a two-stage compressor heat pump and its oil return control system and control method. Background technique [0002] At present, the two-stage compression air supply and enthalpy increase technology is one of the mainstream technologies for low-temperature heating, which has a large heating capacity and high energy efficiency at low temperatures; on the other hand, compared with the single-stage system, the two-stage compression can reduce the high and low pressure ratio and exhaust temperature, which helps to improve unit performance and extend compressor life. In the air conditioning system, the compressor is an important device for system performance and reliability, and lubricating oil directly affects one of the key factors of the compressor. When the two-stage compression system in series is running, due to the large difference between the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B30/02F25B49/02F25B41/04F25B41/06F25B43/02F25B31/00F25B41/20F25B41/30
CPCF25B30/02F25B31/002F25B43/02F25B49/022F25B41/20F25B41/37F25B41/31
Inventor 梁尤轩沈军赵桓谭锋卢耀汕
Owner GREE ELECTRIC APPLIANCES INC
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