Scanning defrost type air-source gas heat pump

Abstract

The invention provides a scanning defrost type air-source gas heat pump, which comprises a gas engine, a Freon compressor, a four-way valve, an indoor heat exchanger, a throttling valve and an outdoor heat exchanger, and is characterized by also comprising a smoke three-way valve and a smoke scanning defrost device, wherein the smoke scanning defrost device is a small-area device which can circularly move along a windward side of the outdoor heat exchanger and jet smoke to a frosted heat transfer surface of the outdoor heat exchanger; the input end of the smoke three-way valve is connected with a smoke exhaust opening of the gas engine; and one output end of the smoke three-way valve is connected with the gas inlet end of the smoke scanning defrost device through a smoke pipe. High-temperature smoke exhausted from the gas engine performs scanning quick defrosting on the outdoor heat exchanger partially and circularly, so that the air-source gas heat pump can defrost and work normally without stopping at a low temperature or an ultralow temperature in the absence of defrosting energy loss. Therefore, the scanning defrost type air-source gas heat pump is an upgraded product of the conventional air-source gas heat pump.

Description

technical field [0001] The invention relates to an air-source gas heat pump driven by a natural gas engine, especially an air-source gas heat pump capable of defrosting without shutting down under ultra-low temperature conditions of -12 degrees outdoors, belonging to the field of air-conditioning technology and energy saving. Background technique [0002] The existing air source gas heat pump is mainly composed of a gas engine, a freon compressor, a four-way valve, an indoor heat exchanger, a throttle valve and an outdoor heat exchanger. The gas engine uses natural gas as energy to drive the freon compressor to work ( It is also possible to drive the generator to work first, and then use the electricity generated by the generator to drive the Freon compressor to work), the exhaust port of the gas engine is discharged to the outside through the exhaust pipe, when the four-way valve is in the indoor heating position, the Freon compressor The output end of the outdoor heat exch...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problem that the existing air-source gas heat pump needs to be shut down frequently for defrosting when it works in winter, and to design a simple and reasonable structure that can defrost without shutting down and work normally under low temperature conditions. The scanning defrosting air source gas heat pump directly uses the high-temperature flue gas discharged from the gas engine to partially defrost the frosted heat transfer surface of the outdoor heat exchanger in turn.

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