A strong heat type outdoor unit, heat pump system and control method thereof

Abstract

The invention discloses a strong heat type outdoor unit, a heat pump system and a control method thereof, relates to the field of air conditioning, and can solve the problem that the exhaust temperature of the compressor is too high in the heating mode of the heat pump system in the low temperature environment in the prior art, resulting in Insufficient heating capacity. The specific solution is that the outdoor unit includes a compression module, an outdoor heat exchanger, and a liquid injection circuit. The liquid injection circuit can be opened when the ambient temperature of the outdoor unit is less than or equal to the first threshold and the outdoor unit is in heating mode. The refrigerant flowing into the liquid injection circuit of the indoor unit is throttled and depressurized, and the throttled and depressurized refrigerant flows into the compression module through the liquid injection end of the compression module, so that the refrigerant flowing into the compression module from the liquid injection circuit is flashed. Generating and absorbing heat into a gaseous refrigerant. The invention is used for refrigeration and heating.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a strong heat outdoor unit, a heat pump system and a control method thereof. Background technique [0002] A heat pump system can transfer heat energy from a low-level heat source to a high-level heat source. Usually, it first obtains low-grade heat energy from natural air, water or soil, performs work through electricity, and then provides high-grade heat energy that can be used by people. [0003] The heat pump system is capable of cooling and heating, and its heating capacity decreases as the ambient temperature of the outdoor unit decreases. When the ambient temperature of the outdoor unit is too low, on the one hand, the compression ratio of the heat pump system is relatively large, that is, the ratio of the discharge pressure to the suction pressure of the heat pump system is too large, which will reduce the volumetric efficiency of the compressor of the heat pump system. A...

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Problems solved by technology

[0005] Embodiments of the present invention provide a strong heating outdoor unit, a heat pump system and a control method thereof, which can solve the problem of excessively high discharge temperature of the compressor in the heating mode of the heat pump system in a low-temperature environment in the prior art, resulting in heating The problem of insufficient ability

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