Strengthened-heating heat pump system combining bypass gas supplementation and heat accumulation of compressor shell

Abstract

The invention discloses a strengthened-heating heat pump system combining bypass gas supplementation and heat accumulation of a compressor shell. According to the strengthened-heating heat pump systemcombining bypass gas supplementation and heat accumulation of the compressor shell, a heat accumulation bag, an gas-liquid separator, a flow-variable throttle valve, a thermal expansion valve, a manual switch valve, a water tank and relevant pipelines are mounted in an original heat pump system, so that a strengthened heating function of the heat pump system is achieved. According to the strengthened-heating heat pump system, waste heat accumulated in the compressor shell is used for heating low-temperature and low-pressure gas flowing out of an outdoor heat exchanger, and a gaseous refrigerant in the gas-liquid separator in a loop and a refrigerant passing through a heat accumulation system are mixed and then flow into a compressor. In the cycle, waste heat in the compressor shell is used, so that power consumption of the circulation system is reduced, and the energy-saving level is improved; and meanwhile, the refrigerant flow in the refrigeration cycle can be effectively increasedthrough bypass gas supplementation, so that the heating capacity of the heat pump system is improved, and the heat pump system is worthy of actual application and popularization.

Description

technical field [0001] The invention relates to a heat pump system for enhanced heating, and the related fields include refrigeration fields such as refrigerators, freezers, air conditioners, heat pumps, and water heaters. Background technique [0002] Coal-fired heating is generally used in northern areas in winter, but due to the great pollution to the environment, the country vigorously promotes and advocates the policy of "coal-to-electricity", and air-source heat pump air conditioners have become the focus of attention as energy-saving and environmentally friendly products . Air source heat pump air conditioners use electric energy as the driving force, are easy to install, have low initial investment, are energy-saving and environmentally friendly, and are the main type of indoor air conditioners in my country. [0003] However, the use of traditional air source heat pumps to achieve heating demand is greatly affected by the external climate environment, especially in...

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Problems solved by technology

[0003] However, the use of traditional air source heat pumps to achieve heating demand is greatly affected by the external climate environment, especially in low temperature and severe cold environments, the heating performance becomes poor and the heating capacity decays, which affects the thermal comfort of the air conditioner

The main reasons are: (1) When the external ambient temperature is low, the evaporation temperature of the outdoor heat exchanger will decrease, and the heat absorbed by the unit refrigerant from the evaporation side will gradually decrease, and the surface temperature of the heat exchange fins will be lower than 0°C, which will form The frost layer seriously affects the heat transfer of the heat exchanger

(2) Decrease in evaporating temperature will lead to increase of compressor suction specific volume and decrease of cycle suction capacity. If the compressor speed is constant, the refrigerant flow rate of the whole system will decrease; at the same time, the volumetric efficiency of the compressor The reduction will also lead to the deterioration of the heating performance

However, this system requires a compressor with an air supply port, which is expensive, and the refrigerant is directly mixed in the compressor cylinder, which may easily cause unstable operation of the compressor.

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