Oil return control method for multi-compressor system
A multi-compressor, oil return control technology, applied in compressors, refrigerators, refrigeration components, etc., can solve problems such as reducing system performance and reliability, affecting the safe use of compressors, and difficult oil return control, and achieving reliable operation. Effect
Inactive Publication Date: 2015-12-02
GREE ELECTRIC APPLIANCES INC
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[0004] The present invention aims to provide a multi-compressor system oil return control method to solve the problem in the prior art that the multi-compressor system oil return control is difficult, which affects the safe use of compressors and reduces system performance and reliability.
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[0024] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0025] Summary of the invention of the present invention comprises the following aspects:
[0026] 1. Use the difference in thermophysical properties between refrigeration oil and refrigerant as the basis for judging the oil level of the compressor to control the oil return loop centered on the oil storage in the multi-compressor system.
[0027] 2. The connecting pipe is led out from the oil equalizing hole of the rotor compressor, and connected to the oil inlet of the oil storage after passing through the solenoid valve and capillary. A temperature sensing package is arranged behind the capillary of the connecting pipe to detect the temperature of the pipe . The difference in thermal physic...
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The invention provides an oil return control method for a multi-compressor system. An oil reservoir is arranged in the multi-compressor system; a connecting pipe is led out of an oil balancing hole of each compressor, and is connected to the oil inlet of the oil reservoir; an oil outlet pipe connected with the oil outlet of the oil reservoir is connected to the low-pressure side of each compressor. The method comprises the following steps: S1, measuring the exhaust temperature of the exhaust port of each compressor and the fluid temperature in the connecting pipe, and judging the oil level of each compressor according to a difference calculated by subtracting the fluid temperature from the exhaust temperature; S2, if the judgment result of the oil level of each compressor, in the step S1, indicates an oil-rich state, making residual oil in each compressor flow towards the oil reservoir under the action of pressure difference for storing, and if the judgment result indicates an oil-poor state, making oil in the oil reservoir flow towards each compressor via an oil return loop. According to the method, the oil level of each compressor is judged according to the difference calculated by subtracting the fluid temperature from the exhaust temperature, and the oil reservoir is used for storing residual oil when each compressor is in an oil-rich state and filling oil into each compressor when each compressor is in an oil-poor state, so that reliable running of each compressor is ensured.
Description
technical field [0001] The invention relates to a multi-compressor system of an air conditioner, in particular to an oil return control method for a multi-compressor system. Background technique [0002] The multi-connected air-conditioning unit has difficulty in oil return due to the characteristics of long pipelines, large drops, and many elbows. The oil return problem has become a key issue for its reliable operation. The operating state of the system is complicated, and the problem of oil return is more prominent. [0003] At present, the common methods to deal with the oil return problem include reasonable pipeline design of the system, setting up an efficient oil separator, a suitable gas-liquid separator, and oil return circulation, etc. For multi-compressor systems, conventional oil return measures cannot effectively ensure balanced oil return. It will endanger the safe use of the compressor and reduce the performance and reliability of the system. Contents of th...
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IPC IPC(8): F25B31/00F25B49/02
Inventor 邹云霞沈军王永立胡强王少山陈振松王瑞强
Owner GREE ELECTRIC APPLIANCES INC