A gas heat pump air conditioning system capable of reducing lubricating oil temperature and its control method

Abstract

The invention relates to a fuel gas heat pump air-conditioning system and control method capable of reducing temperature of lubricating oil. The system comprises a refrigerant circulation loop and anoil cooler, wherein the refrigerant circulation loop is formed by the sequential connection of a compressor, an oil separator, a four-way valve, an indoor unit heat exchanger, an outdoor unit heat exchanger and a gas-liquid separator. The oil cooler comprises a closed cylinder body, wherein the upper end surface and the lower end surface of the cylinder body are provided with an oil inlet and an oil outlet which communicate with the interior of the cylinder body. The oil inlet communicates with the bottom of the oil separator, and the oil outlet communicates with an air suction pipe of the compressor. The cylinder body is internally provided with a coil pipe, wherein the inlet end and the outlet end of the coil pipe extend out of the cylinder body, the outlet end is connected to an air inlet pipe of the gas-liquid separator, and the inlet end is connected to a pipeline between the indoor unit heat exchanger and the outdoor unit heat exchanger. According to the fuel gas heat pump air-conditioning system and control method, by adjusting the opening degree of an auxiliary electronic expansion valve, the temperature of the lubricating oil can be effectively reduced, thus ensuring the normal operation of the system.

Description

technical field [0001] The invention relates to an air-conditioning system, in particular to a heat pump air-conditioning system and its control method, in particular to a control method of a gas-fired heat pump air-conditioning system capable of reducing the temperature of lubricating oil. Background technique [0002] Lubricating oil is essential for the normal operation of most air conditioner compressors. The lack of oil in the compressor will cause mechanical wear and damage to the compressor. The lubricating oil is usually miscible with the refrigerant. When the temperature of the refrigerant rises after being compressed by the compressor, the temperature of the lubricating oil also rises accordingly. Gas heat pump air conditioner is an air conditioning system that uses a gas engine to drive a compressor to complete the cooling and heating cycle. Since the air-conditioning system recovers engine heat, the exhaust temperature of the gas heat pump air-conditioning syste...

AI Technical Summary

Problems solved by technology

Excessively high lubricating oil temperature will lead to problems such as viscosity reduction and index attenuation. Moreover, during the process of high-temperature lubricating oil being separated by the oil separator and returning to the compressor, the lubricating oil exchanges heat with the outside world, and the temperature gradually decreases, which will cause heat loss.

[0003] At present, the lubricating oil is cooled mainly through natural cooling, which is not effective and difficult to meet the operation requirements of gas heat pumps, and urgently needs improvement.

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