A heat recovery device structure and air-cooled heat pump unit

Abstract

The invention discloses a heat recoverer structure and an air-cooled heat pump unit and relates to the technical field of heat pumps. The heat recoverer structure and the air-cooled heat pump unit are designed for solving the problem that the liquid feeding pressure of an electronic expansion valve is insufficient due to the fact that the water inlet temperature of a heat exchanger of an existing heat recoverer is low. The heat recoverer structure comprises a compressor, a water heat exchanger, a condenser, an electronic expansion valve, an evaporator and a first gas-liquid separator which are connected in sequence, and the water heat exchanger is used for conducting heat exchanging with water. The heat recoverer structure further comprises a second gas-liquid separator. An inlet of the second gas-liquid separator is connected with a refrigerant outlet of the water heat exchanger. An air outlet of the second gas-liquid separator is connected with the condenser. A liquid outlet of the second gas-liquid separator is connected with the front end of the electronic expansion valve. According to the heat recoverer structure provided by the invention, gas-liquid separating is conducted on refrigerant flowing out of the water heat exchanger by additionally arranging the gas-liquid separators, the separated liquid refrigerant is directly introduced to the front end of the electronic expansion valve, and even if the water inlet temperature in the water heat exchanger is low, the effect that liquid feeding of the front end of the electronic expansion valve is sufficient can also be ensured, so that the operational reliability is greatly improved.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to a heat recovery device structure and an air-cooled heat pump unit having the heat recovery device structure. Background technique [0002] In the existing air-cooled heat pump unit, a water heat exchanger is generally installed between the condenser and the compressor, and the sensible heat of the refrigerant flowing out of the compressor is recovered by the water heat exchanger to produce hot water, so as to effectively utilize the heat. ,Energy saving. [0003] However, the above structure has the following problems: because in actual use, the inlet water temperature of the water heat exchanger is not a constant value, when the inlet water temperature is low, the refrigerant not only absorbs sensible heat, but also absorbs part of the latent heat, resulting in part of the refrigerant in the After condensing in the water heat exchanger, it accumulates at the bottom of the he...

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Problems solved by technology

[0003] However, the above-mentioned structure has the following problems: in actual use, the inlet water temperature of the water heat exchanger is not a fixed value, when the inlet water temperature is low, the refrigerant not only absorbs sensible heat, but also absorbs part of latent heat, resulting in part of the refrigerant After condensation in the water heat exchanger, it accumulates at the bottom of the heat recovery device and cannot be taken away, resulting in insufficient liquid supply at the front end of the electronic expansion valve, and low-pressure protection occurs during operation or startup, seriously affecting the normal operation of the air-cooled heat pump unit

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