Outdoor unit control system, heat pump unit and control method thereof

Abstract

The invention proposes an outdoor unit control system, a heat pump unit and a control method thereof. The outdoor unit control system comprises a refrigerant loop formed by serially connecting a compressor, a heat exchange element, a throttling device, a condenser and a separator; the throttling device includes a main throttling element, and at least one branch throttling element connected with the main throttling element in parallel; the branch throttling element is serially connected with an electromagnetic valve; the refrigerant loop is connected with a liquid spraying pipeline in parallel; an inlet end of the liquid spraying pipeline is arranged between the heat exchange element and the throttling device, and an outlet end is arranged between the condenser and the separator; and the liquid spraying pipeline is provided with a liquid spraying valve. The outdoor unit control system further comprises a controller; and the opening and the closing of the electromagnetic valve and the liquid spraying valve are controlled to adjust the flow and the temperature of a refrigerant entering the compressor to adjust the output capacity of an outdoor unit, so that the time of the water supply temperature reaching the highest set temperature is prolonged, the temperature reaching start and stop frequency of the outdoor unit is reduced, and the water supply temperature is stable.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to an external machine control system, a heat pump unit and a control method thereof. Background technique [0002] As people's awareness of quality of life continues to improve, more and more people will choose to use floor heating for heating in winter. For a fixed-speed air-cooled hot and cold water heat pump unit, when working under a small load (such as an outdoor ambient temperature of about 10°C), the outlet water temperature will soon reach the preset value, and the compressor will continue to start and stop, resulting in a decrease in the supply water temperature. The fluctuation is large, and the indoor temperature cannot reach a more comfortable temperature for a long time. [0003] In response to the above situation, there are currently two solutions: (1) use frequency conversion products instead of fixed speed products, and use frequency conversion control techno...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide an external unit control system, aiming to solve the problem of frequent start and stop of heat pump units under small load conditions, resulting in large fluctuations in water supply temperature

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