Oil return control method for refrigerating system

Abstract

The invention discloses an oil return control method for a refrigerating system. The oil return control method comprises the steps of: 1) setting a first preset liquid level, a second preset liquid level, a first preset temperature and a second preset temperature, wherein the second preset liquid level is higher than the first preset liquid level, and the second preset temperature is higher than the first preset temperature; 2) detecting liquid level in an oil return device and comparing the detected liquid level with the first preset liquid level, when the detected is lower than the first preset liquid level, opening a gas return port and a liquid inlet port; detecting the liquid temperature inside the oil return device and comparing the detected liquid temperature with the first preset temperature, when the detected liquid temperature is lower than the first preset temperature, starting heating and opening the gas return port; 3) when the detected temperature is not lower than the second preset temperature and the detected liquid level is not lower than the second preset liquid level, entering the next step; 4) closing the liquid inlet port, opening an oil return port for returning oil, and when the detected liquid level is lower than the first preset liquid level, entering the step 2). According to the oil return control method for the refrigerating system, the phenomenon of oil shortage on the system is avoided, the components wear is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of refrigeration equipment, in particular to a method for controlling oil return in a refrigeration system. Background technique [0002] In the refrigeration system, it is necessary to separate the refrigerant and the refrigerating oil. Although the unit is equipped with a high-efficiency separation device for the refrigerant and the oil, it cannot guarantee the complete separation of the refrigerant and the refrigerating oil. If it is brought into refrigeration pipes and heat exchange equipment, dirt such as oil film will adhere to the heat exchange pipes, which will reduce the heat exchange effect of the equipment; moreover, a large loss of refrigeration oil will cause the internal parts of the system to fail to lubricate normally, such as affecting the normal operation of the compressor. run. [0003] Therefore, an oil return device is installed in the system, so that the mixture of refrigerant and refr...

AI Technical Summary

Problems solved by technology

[0004] However, the oil return operation of the oil return device is done manually, and it is very easy to cause too much refrigerated oil in the oil return device or too much refrigerated oil in the refrigeration pipeline due to untimely oil return, resulting in a phenomenon of oil shortage in the system, resulting in compressor failure. Other components are seriously worn due to lack of oil, and even the compressor is damaged, which affects the service life; and too much refrigeration oil in the refrigeration pipeline will reduce the heat exchange effect of the equipment

Images