Compressor oil return device, air conditioning system and oil return control method

Abstract

The invention relates to a compressor oil return device, an air conditioning system and an oil return control method. The compressor oil return device comprises a double-suction double-exhaust compressor, and an oil separator and an oil return component which are connected to the double-suction double-exhaust compressor, wherein the oil return component comprises an oil return valve and a connecting pipe; the oil return valve comprises a valve body, a valve needle, a fixed block and a sliding block; the fixed block is fixedly connected into the valve body; the fixed block divides the valve body into an upper cavity and a lower cavity; the sliding block is arranged in the lower cavity and located below the fixed block; a middle cavity is arranged between the sliding block and the fixed block; a flow channel communicated with the upper cavity and the lower cavity is arranged in the middle cavity; and the valve needle matched with the flow channel is arranged under the flow channel. The length of the valve needle extending into the flow channel is changed through vertical sliding of the sliding block in order to achieve adjustment of the oil return amount. The oil return valve is simple in structure, low in manufacturing cost and convenient to use, the problems of high oil discharge rate and difficult lubricating oil return in a direct exhaust compression cylinder of the double-suction double-exhaust compressor can be effectively solved, the abrasion of the compressor is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of air-conditioning systems, in particular to an oil return device for a compressor, an air-conditioning system and an oil return control method. Background technique [0002] Existing air-conditioning systems usually use a single-suction single-row compressor, which forms a refrigeration cycle with indoor and outdoor single-row or multi-row heat exchangers to heat or cool indoor air to meet the comfort requirements of the indoor environment. Commonly used air conditioning systems can only achieve one evaporation temperature and condensation temperature because the compressor has only one pair of suction and exhaust ports connected to the indoor and outdoor heat exchangers. [0003] The invention with the Chinese patent application number CN105444453A proposes a dual-temperature refrigeration and heating system, which uses a dual-temperature air-conditioning system with dual-cylinder parallel compressors to ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems or at least partly solve the above-mentioned technical problems, the present application provides a method to solve the problems of high oil discharge rate in the compression cylinder and difficulty in lubricating oil return caused by the direct exhaust of the double-suction double-row compressor in-line cylinder. Compressor oil return device, air conditioning system and oil return control method

Images