Heating and refrigeration vortex type air source heat pump system

Abstract

The invention belongs to the field of steam compression type air source heat pumps and provides a heating and refrigeration vortex type air source heat pump system comprising a four-way reversing valve B, a high-pressure switch B, a water side shell and tube heat exchanger B, an exhaust temperature sensor B, an electromagnetic valve C, a fan B, a fin temperature sensor B, an air side fin heat exchanger B, a check valve F, an enhanced vapor injection compressor B, a low-pressure switch B, an air-liquid separator B, a pipeline filter, a check valve G, an electromagnetic valve D, a dry filter B,an electronic expansion valve, an economizer B, a liquid storage tank B, an electromagnetic valve E and other parts. With application of the heating and refrigeration vortex type air source heat pumpsystem, 1, the idea that refrigeration, heating and air supply of the heating and refrigeration vortex type air source heat pump system share the one electronic expansion valve is achieved, complexityand manufacturing cost are lowered, and full-working-condition refrigerating capacity and COP are promoted by 5% or above; and 2, during reverse cycle defrosting of the heating and refrigeration vortex type air source heat pump system, a refrigerant does not pass through the electronic expansion valve for throttling cooling and directly enters the water side shell and tube heat exchanger for heatexchange, room comfort is improved, and defrosting time is shortened by 5 seconds or above.

Description

technical field [0001] The invention relates to a heat pump system, in particular to a heating and cooling scroll air source heat pump system. Background technique [0002] attached figure 1 It is a schematic diagram of a heating and cooling scroll air source heat pump system commonly used in the current domestic heat pump and air-conditioning industry. In the figure, 1, four-way reversing valve A, 2, high-pressure switch A, 3, water-side shell-and-tube type Heat exchanger A, 4, exhaust temperature sensor A, 5, one-way valve A, 6, jet booster compressor A, 7, low pressure switch A, 8, fan A, 9, fin temperature sensor A, 10, air Side fin heat exchanger A, 11, gas-liquid separator A, 12, oil sight glass, 13, dry filter A, 14, liquid storage tank A, 15, solenoid valve A, 16, thermal expansion valve A, 17 , Economizer A, 18, Check valve B, 19, Check valve C, 20, Thermal expansion valve B, 21, Thermal expansion valve C, 22, Solenoid valve B, 23, Check valve D, 24, Check valve ...

AI Technical Summary

Problems solved by technology

But the system still has obvious disadvantages: for example, the system needs both heating and cooling. The ambient temperature range of the applicable occasion is from -15°C to +43°C, and the corresponding refrigerant will be at -25°C--+ Evaporation work within a temperature range of 5°C, due to the functional and performance limitations of the thermal expansion valve used, this full temperature range operating condition is not competent for a single thermal expansion valve, and the system can only succumb to thermal power when matching design The expansion valve adopts an independent expansion valve system for cooling mode and heating mode, which will inevitably increase the complexity and manufacturing cost of the system, increase the operating resistance of the system, increase energy consumption, and reduce COP; the system uses a thermal expansion valve to exhaust When the temperature difference between the temperature and the condensing temperature is used as the target parameter to control the air supply amount, the air supply amount is insufficient when the exhaust temperature is low, and the system COP cannot reach the optimum; when the system adopts reverse cycle defrosting, the refrigerant is throttled through the thermal expansion valve After cooling down, although the unit refrigerant can absorb more energy from the refrigerating circulating water, the operating efficiency of the refrigerant is low, the defrosting time of the system is long, and the comfort is poor, etc.

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