Heat source tower heat pump unit and simple switching method for refrigerating and heating dual functions of heat source tower heat pump unit

Abstract

The invention discloses a heat source tower heat pump unit and a simple switching method of the refrigerating function and the heating function of the heat source tower heat pump unit, and belongs to the technical field of heat pumps. The heat pump unit comprises a first compressor, a first heat exchanger, a throttling element and a second heat exchanger which are sequentially communicated and used for refrigerant circulation. And the first compressor realizes reversing of a refrigerant through position and direction change. According to the heat pump unit, the defects of a water pipeline switching system adopted by a conventional heat pump unit are overcome, and meanwhile, the defects of pipeline switching in a conventional refrigerant system are also overcome; an anti-freezing solution is prevented from entering an indoor system, the indoor system is protected, the installation difficulty of a machine room is effectively reduced, and the installation space is reduced; the refrigerant pipeline is simple, short in length and small in channel resistance, the heat pump unit can operate with high energy efficiency, the pipeline does not need to adopt a four-way valve, and energy efficiency reduction caused by pressure drop of four-way valve switching is avoided.

Description

technical field [0001] The invention belongs to the technical field of heat pumps, and in particular relates to a heat source tower heat pump unit and a simple switching method for cooling and heating dual functions thereof. Background technique [0002] Existing heat source tower heat pump units generally use waterway switching to switch between cooling and heating functions. The original waterway switching needs to use valves to switch, and the water pipeline of the evaporator in the heat pump unit is connected to the indoor unit, and the water pipe of the condenser The road is connected to the heat source tower, and the condenser is connected to the indoor unit when the cooling and heating functions are switched, and the evaporator is connected to the heat source tower. Since the installation and operation of the large valve in the water pipeline is difficult, and the closed valve cannot be guaranteed to be absolutely closed, it will easily lead to water leakage between t...

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Problems solved by technology

Since the installation and operation of the large valve in the water pipeline is difficult, and the closed valve cannot be guaranteed to be absolutely closed, it will easily lead to water leakage between the water pipelines (that is, the water pipeline between the condenser and the evaporator is partially connected), because the water in the heat source tower in winter The antifreeze solution is used in the system, which causes the antifreeze solution to enter the indoor system, causing corrosion of the indoor system and heat loss; Some small systems generally use four-way valves for compressor refrigerant reversing. The use of four-way valves is suitable for systems with small volumes and requires high system cleanliness. It is generally suitable for small air conditioners and not suitable for large heat pump units. ; There are also systems that set pipelines and valves at the inlet and outlet of the compressor, and use pipeline switching to complete the refrigerant reversing. In the pipeline switching method, in order to ensure the energy efficiency of the system, it is necessary to minimize the distance between the compressor and the heat exchanger. The length of the pipeline in the refrigerant system, the channel resistance, the curvature of the bend, and the use of special valves, etc., the existing structure that uses pipeline switching to complete the refrigerant reversing

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