Direct expansion type ground source heat pump refrigerant leakage-proof device and method thereof

Abstract

The invention provides a direct expansion type ground source heat pump refrigerant leakage-proof device and a method thereof. The device is characterized in that on the basis of a compressor of a direct expansion type ground source heat pump system, a four-way reversing valve, an overground heat exchanger, a throttle valve, a buried heat exchanger and other main components, a low-pressure liquid storage device, an electric heater, a first flow meter, a second flow meter, a refrigerant pump, a low-pressure gas storage device, a gas-liquid separator, a temperature sensor, a controller and corresponding electromagnetic valves and pipelines are additionally arranged, and normal heat exchange of refrigerants, leakage detection judgment of a leakage-proof device and refrigerant recovery after leakage occur are achieved through switching of the electromagnetic valves. The device not only can accurately detect the leakage of the refrigerant, but also can further recover a large amount of refrigerant in a system into the system at an initial stage of leakage, so influence on the environment is reduced, and safe operation of the compressor of a heat pump system is ensured.

Description

【Technical field】 [0001] The invention relates to a direct expansion type ground source pump refrigerant leakage prevention device and a method thereof. 【Background technique】 [0002] The direct expansion ground source heat pump system directly passes the refrigerant into the copper buried heat exchanger loop buried in the underground soil, and uses the phase change of the refrigerant to achieve direct heat exchange with the underground soil. When heating in winter, the buried heat exchanger absorbs heat from the soil; when air conditioning in summer, the buried heat exchanger emits heat to the soil. Compared with the conventional ground source heat pump, the direct expansion ground source heat pump system has the characteristics of high efficiency, low construction cost and energy saving, which has been paid more and more attention. However, due to the characteristics of its own structure, the direct expansion ground source heat pump system has the following main problems...

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Problems solved by technology

[0006] 4. The buried heat exchanger adopts the same copper pipe pipeline, which has the problem of difficult oil return

The Chinese patent application number CN201520856226.1 discloses an air-conditioning system with a refrigerant leakage safety alarm device, which proposes to detect leaks by setting detectors for real-time monitoring, but for direct expansion ground source heat pumps, buried The ground heat exchanger cannot be equipped with a detector, and this method is also not applicable

The Chinese patent with the application number CN201610932263.5 discloses a method for detecting refrigerant leakage of an air conditioner and its control device. It proposes to install flow meters in each component of the air conditioning system to detect whether the refrigerant is leaking, but for direct expansion ground source The heat pump refrigerant undergoes a phase change in the buried heat exchanger, and the flowmeter cannot be accurately measured. At the same time, a large number of flowmeters are required. This method is also not applicable

[0009] Under the above circumstances, a large amount of refrigerant is injected into the direct expansion ground source heat pump, and there is a hidden danger of corrosion in the buried heat exchanger, and the leakage of refrigerant will affect the stability and safety of the unit

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