Control method of compressor and its oil pump

Abstract

The invention discloses a compressor and an oil pump control method thereof. The compressor comprises a housing. The housing comprises a compression chamber for accommodating a compression member and an oil reservoir chamber for storing oil feeding to the compression chamber. The housing is provided with an oil outlet communicated with the oil reservoir chamber and an oil inlet communicated with the compression chamber. An oil pump piping is arranged outside the housing and comprises an oil pump, an oil inlet pipe connected between the inlet end of the oil pump and the oil outlet, and an oil outlet pipe connected between the outlet end of the oil pump and the oil inlet. By means of the above structure, when the compressor is under the condition that the difference between high pressure and low pressure is insufficient, refrigeration oil of the compressor can be still in normal circulation and reliable operation through the oil supply effect of the oil pump, and the operating range of a unit is increased in a way for enabling the unit to be more competitive in the using range. Moreover, the compressor has the advantages of being simple in structure and easy to assembly.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to a compressor and a method for circulating oil in the compressor. Background technique [0002] In the market, the application of compressors will have an operating range or requirements. The operating range of the compressor is considered in terms of reliability. There are many factors that affect the reliability of the compressor. Among them, ensuring the circulation of the refrigeration oil inside the compressor ensures that The normal lubrication of the moving parts inside the compressor and the normal operation of the loading and unloading parts are one of the main factors affecting the reliability of the compressor. [0003] At present, in large chillers (such as air-cooled screw, water-cooled screw, etc.), the circulation power of the refrigeration oil inside the high-pressure chamber compressor (screw compressor) is completely provided by the pressure difference between the...

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Problems solved by technology

[0003] At present, in large chillers (such as air-cooled screw, water-cooled screw, etc.), the circulation power of the refrigeration oil inside the high-pressure chamber compressor (screw compressor) is completely provided by the pressure difference between the high pressure and low pressure of the compressor (high pressure-low pressure). When the high and low pressure difference of the compressor is low (such as an air-cooled screw, for a heat pump unit, when heating, when the ambient temperature is very low, the temperature of the water side may be very low when starting, and the heating capacity is also low, and the water temperature and condensing pressure cannot be adjusted. Rapid increase, low pressure difference between high pressure and low pressure; for year-round refrigeration single-cooling units, when the ambient temperature is low, the high pressure may be low, and the high and low pressure difference may be insufficient), the compressor refrigeration oil circulation power is insufficient, which may cause compression The machine does not have enough refrigeration oil to lubricate, causing abnormal phenomena such as compressor burnout and abnormal noise, which seriously affects the reliability of the unit. Especially for units with R134a refrigerant, due to the relatively lower pressure of R134a, insufficient high and low pressure differences are more likely to occur , at this time, the usual practice is to limit the operating range of the compressor so that the compressor does not operate under low-high-pressure differential or risk allowing the compressor to run. No matter what method is adopted, it will not meet the actual needs of users or affect the reliability of the unit. sexual phenomenon

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