Oil-return control method and device for compressor

Abstract

The invention provides an oil-return control method for a compressor. The oil-return control method comprises the steps that the real-time level of oil in a gas-liquid separator is obtained, and according to the real-time level of the oil, an oil-return pipeline is controlled. When the compressor works, the oil in the compressor can be transformed into a gas state, the gas-state oil enters a recycle circuit, and it is required that the gas-liquid separator separates out the oil which has entered the circulating pipeline to make the oil return to the compressor, so that burnout of the compressor is prevented. In the method, the oil-return pipeline is controlled according to the real-time level of the oil in the gas-liquid separator to conduct oil return, and the efficiency of the compressoris improved as far as possible. The invention further provides an oil-return device for the compressor. The oil-return device comprises the gas-liquid separator, an electromagnetic valve and the oil-return pipeline, and an oil level detection module is arranged in the compressor. Generally, the compressor is replenished with oil by using an extra oil tank, and the situation that the internal oilis utilized to be transformed into the gas state and then enters the recycle circuit when the compressor runs, and consequently, burnout of the compressor is caused is prevented. In the method, the oil-return pipeline is arranged in the gas-liquid separator, an oil replenishing device is omitted, so that the problem that the oil replenishing device is extra added is solved, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of air conditioning equipment, in particular to a compressor oil return control method and device. Background technique [0002] The gas-liquid separator is installed on the return air line of the compressor to separate the gas from the liquid and prevent the liquid refrigerant from flowing into the compressor and causing the compressor to slam. The separated liquid refrigerant and compressor lubricating oil settle at the bottom of the gas-liquid separator. In order to ensure the normal operation of the compressor, it is necessary to return the lubricating oil to the compressor. [0003] The internal structure of the gas-liquid separator: an oil return hole is installed at the bottom of the gas outlet pipe, and a filter screen cover is welded on the surface of the oil return hole to filter impurities. In the actual welding process, the solder joints of the filter screen cover are often tilted, resulting in The oil re...

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