41results about How to "Improve heating energy efficiency ratio" patented technology

The invention provides an air conditioner defrosting circulation system comprising a compressor. A compressor exhaust pipe is connected with a four-way valve which is connected with an outdoor heat exchanger, an indoor heat exchanger and a gas-liquid separator, the gas-liquid separator is connected with a compressor intake pipe, a heat storage water tank is arranged on the compressor exhaust pipe, and a water spray port of the heat storage water tank is formed in the outdoor heat exchanger and matched with a return pipe of a water storage tank. The four-way valve is not switched, but the heat-preservation heat storage water tank is arranged on the compressor exhaust pipe to collect waste heat during circulation and fully utilize the waste heat, an outdoor unit is defrosted by a hot water spraying mode, normal heating of an indoor unit is guaranteed in the whole defrosting process, heating efficiency is improved effectively, and service life of the system is prolonged.

The invention discloses a control method of a heat pump water heater, the heat pump water heater and a heat pump unit and belongs to the field of heat pump water heater devices and control methods thereof. The control method of the heat pump water heater, the heat pump water heater and the heat pump unit are designed in order to overcome the defect that protection on a compressor is not available in the prior art. The control method of the heat pump water heater includes the steps that the water flow value is controlled according to the water inlet temperature of a water side heat exchanger, the water flow value is increased along with increase of the water temperature, and the higher heating energy efficiency ratio COP can be obtained under the condition that reasonable loads of the compressor are guaranteed. The heat pump water heater for implementing the control method comprises a control device, a water pump and a thermal bulb, wherein the water pump and the thermal bulb are connected with the control device. The thermal bulb is arranged at the position of the water inlet end of the water side heat exchanger. The water pump is a variable-frequency water pump. According to the control method of the heat pump water heater, the heat pump water heater and the heat pump unit, the water flow value is controlled according to the water inlet temperature of the water side heat exchanger, and the higher heating energy efficiency ratio COP can be obtained under the condition that the reasonable loads of the compressor are guaranteed.

The invention discloses a vehicle-mounted heat pump air-conditioner with the gas-replenishing and enthalpy-increasing function. The vehicle-mounted heat pump air-conditioner comprises a compressor (1), a gas-liquid separator (12), a four-way valve (3), an evaporator (11), a gas-replenishing electronic expansion valve (10), an economizer (6), a main circuit electronic expansion valve (5), a condenser (4) and a check valve (8). A port E of the four-way valve is connected with an inlet of the evaporator, and an outlet of the evaporator sequentially passes through a first heat transfer channel ofthe economizer, the main circuit electronic expansion valve and the condenser and is connected with a port C of the four-way valve. The output end of the evaporator further sequentially passes throughthe gas-replenishing electronic expansion valve, a second heat transfer channel of the economizer and the check valve and is connected with a middle compression cavity of the compressor. A port D ofthe four-way valve is connected with an exhaust outlet of the compressor. The two ends of the gas-liquid separator are connected with a suction inlet of the compressor and a port S of the four-way valve correspondingly. The vehicle-mounted heat pump air-conditioner with the gas-replenishing and enthalpy-increasing function is particularly suitable for operating in a low-temperature environment, and the reliability is high.

The invention provides an ultralow-temperature overlapped triple generation heat pump unit.The ultralow-temperature overlapped triple generation heat pump unit is characterized in that a low-temperature heat pump system, a high-temperature heat pump system, a hot water producing device and a control center are included; the hot water producing device comprises a hot water producing heat exchanger, a circulating water pump is arranged at the cold water inlet end of the hot water heat exchanger, and an evaporation condenser is connected with a high-temperature throttling device through a high-temperature heat exchanger switching solenoid valve; the output end of a high-temperature part compressor is connected with the heat medium input end of the hot water producing heat exchanger, the heat medium output end of the hot water producing heat exchanger is connected with a high-temperature part four-way valve, and the high-temperature part four-way valve is controlled to control the output end of the high-temperature part compressor to be selectively communicated with a high-temperature part air cooling heat exchanger or a high-temperature part water side heat exchanger.The needs for air conditioner refrigeration and heating and domestic hot water can be met at the same time, an overlapped system is not started during refrigeration, single-stage compression is adopted for refrigeration, the system is simpler and better in energy saving effect, the overlapped system is adopted in the low-temperature heating process, and the heating energy efficiency is higher.

The invention provides a multi-section heating multi-section tempering and drying airflow closed cycle heat pump drying system. The multi-section heating multi-section tempering and drying airflow closed cycle heat pump drying system comprises a drying part, a heat pump system, a drying medium inflow channel and a drying medium outflow channel, wherein the heat pump system is used for producing a drying medium, and the drying medium inflow channel and the drying medium outflow channel communicate with the drying part. The inflow channel and the outflow channel communicate end to end. The drying part, the inflow channel and the outflow channel form a loop allowing the drying medium to circulate. The drying part comprises at least one drying room. At least two drying sections are arranged in each drying room. The two or more drying sections are arranged at intervals in sequence, and the space between every two adjacent drying sections form a tempering section. The drying medium from the inflow channel flows through the drying sections. To-be-dried objects pass the drying sections to be dried, enter the tempering sections to be tempered, and then reenter the next drying section to be dried. According to the multi-section heating multi-section tempering and drying airflow closed cycle heat pump drying system, the multiple heating and drying sections and the multiple tempering sections are arranged, so that the drying operation temperature is lowered, the heating energy efficiency ratio of a heat pump unit is greatly increased, and in addition, the dust pollution of air-out of a drying device to the environment is completely eliminated.

The invention discloses a refrigeration / heating system with the inside and outside heat exchanger volume ratio variable. The refrigeration / heating system comprises a circulating system formed by a compressor, an outdoor heat exchanger, capillary tubes, an indoor heat exchanger, a four-way valve and a check valve. The refrigeration / heating system is characterized in that the outdoor heat exchanger is composed of a first outdoor heat exchanger and a second outdoor heat exchanger, the first outdoor heat exchanger is connected with the second outdoor heat exchanger through the check valve, and two ends of the check valve are in parallel connection with the throttling capillary tubes. According to the system, the second outdoor heat exchanger serves as part of the indoor heat exchanger under the heating, the super-cooling degree of the system is reduced by performing cooling again through the second outdoor heat exchanger, system pressure is reduced, the system heating capacity is improved, system input power is reduced, and accordingly the heating EER of the system is improved.

The invention discloses an anion high-temperature thermal-energy clothes dryer. The clothes dryer includes an equipment cabinet, a controller, a clothes drying chamber formed in the upper portion of the equipment cabinet and a thermal energy chamber formed in the lower portion of the equipment cabinet; the clothes drying chamber is connected with the thermal energy chamber through an air flue, a water tank is arranged on the lower portion of the clothes drying chamber and internally provided with a PTC heater and an ultrasonic atomizer, and the clothes drying chamber is internally provided with a variable-frequency ultrasonic device and an atomizing sprayer which is connected with the ultrasonic atomizer through an atomizing conduit; the thermal energy chamber is internally provided with athermal energy circulating pump, the thermal energy circulating pump adopts a working principle of latent heat of vaporization for circularly utilizing the thermal energy of water vapor in the clothes drying chamber and circularly acting on the clothes drying chamber. The air outlet volume of the clothes dryer is large and uniform, clothes can be ironed flat, cleaning of the clothes is thorough and environmentally friendly, diversified functions are integrated on the clothes dryer, and the energy efficiency ratio of heating is greatly increased.

The invention discloses a control method of a vehicle-mounted heat pump air-conditioning set. On the basis of a major loop of the vehicle-mounted heat pump air-conditioning set, an air supplementing loop is added; the major loop is internally provided with a main road electronic expansion valve (5), a compressor (1), a gas-liquid separator (12), a condenser (4), and an evaporator (11); the major loop and the air supplementing loop transfer heat through an economizer; the air supplementing loop is provided with an air supplementing electronic expansion valve and a one-way valve; and gas outputfrom the air supplementing loop enters a middle compression valve of the compressor. The control method of the vehicle-mounted heat pump air-conditioning set is especially suitable for operating in low temperature environment, and the reliability is high.

The invention relates to the technical field of air source heat pump high-efficiency heating under multiple working conditions particularly a low-temperature environment, in particular to a device forhigh-efficiency energy heating under a low temperature condition, and a control method thereof. A low-temperature air source module is connected between an energy storage water tank and a high-temperature water source screw rod unit; the high-temperature water source screw rod unit outputs high-temperature water to an end user side; electric auxiliary heating is arranged between the high-temperature water source screw rod unit and the end user side; an end water supplement pump is arranged on the water outlet side from the energy storage water tank to an end pipe network; a low-temperature condenser of the low-temperature air source module and a high-temperature system evaporator of the high-temperature water source screw rod unit are cyclically coupled through a waterway; and the low-temperature water source module prepares low-temperature hot water used as a low-temperature heat source of the high-temperature water source screw rod unit. According to the device for high-efficiency energy heating under the low temperature condition, and the control method thereof provided by the invention, the low-temperature adaptability of the air source heat pump can be improved, and a low-temperature heating performance is improved.

The invention relates to an air source heat pump unit capable of realizing continuous heat supply. The air source heat pump unit comprises a compressor unit, an indoor water heat exchange unit, a quasi-second-stage compression unit, an outdoor air heat exchange unit and a defrosting branch unit. According to the air source heat pump unit disclosed by the invention, the new technical scheme of quasi-second-stage compression, water-side double-stage heat exchange, and multi-branch heat taking and alternating defrosting, of an air source heat pump under the working condition of low environment temperature is adopted, firstly, a compressor is additionally provided with an air supplementing port, and a middle plate heat exchanger is additionally arranged in a system, so as to form heat pump circulation with the quasi-second-stage compression; secondly, double-stage heat exchange is adopted for the indoor water heat exchange unit, and two stages of heat exchangers are arranged, so as to furthest increase the temperature of circulating water, and the temperatures of supply and return water; and finally, an outdoor air heat exchanger of the air source heat pump is configured to be at leasttwo branched heat taking and defrosting systems capable of independently running, and defrosting operation is carried out on a fluorine-air heat exchange mechanism in each branch in an alternating manner one by one, so that alternating accurate defrosting and continuous heat supply are realized.

The invention discloses an outward discharging wet type two-effect drying heat pump unit which comprises an air flow circulation channel provided with an air inlet and an air outlet and further comprises at least two heat pump units. Each heat pump unit comprises a compressor, a condenser, a throttling device and an evaporator which are connected in sequence, wherein the evaporator is located in environment air outside the air flow circulation channel, and the condenser is located in the air flow circulation channel. The air flow circulation channel is provided with a wet discharging opening and a fresh air opening, and the evaporator of at least one heat pump unit is arranged at the wet discharging opening. The wet discharging opening and an air suction opening are provided with hole plate structures with adjustable hole opening degrees. Part of warm and wet air flows out from the wet discharging opening and then flows through the evaporators at the wet discharging opening, the otherpart of warm and wet air is mixed with fresh air supplied from the fresh air opening, the mixed air then flows through all the condensers to be heated into high-temperature dry air, and the high-temperature dry air is sent by into a drying chamber to be subjected to the new round of drying work.

The invention discloses a ground source heat pump system and a ground source heat pump air conditioner, wherein the ground source heat pump system comprises a ground source heat pump machine unit and a ground buried pipe system in liquid communication with the ground source heat pump machine unit, a water inlet pipe and a water outlet pipe are connected between the ground source heat pump machine unit and the ground buried pipe system, and heat exchange media flowing through the ground buried pipe system flow to the ground source heat pump machine unit through the water inlet pipe and further flow back into the ground buried pipe system through the water outlet pipe, wherein a volume type heat accumulation water tank is connected onto the water inlet pipe. The ground source heat pump system provided by the invention has the advantages that the volume type heat accumulation water tank is arranged on the water inlet pipe, the heat exchange media heated by the ground buried pipe system can be subjected to secondary heating in the volume type heat accumulation water tank, the heat generation energy efficiency ratio of the whole ground source heat pump system is improved, the heat supply can be more effectively provided by the ground source heat pump air conditioner adopting the ground source heat pump system, and in addition, the ground source heat pump system and the ground source heat pump air conditioner better conform to green environment-friendly and energy-saving concepts.

The invention discloses a scroll refrigeration compressor with a suction supercharging function. The scroll refrigeration compressor comprises a compressor shell, a compression device and a suction supercharging device, wherein a machine body suction channel is formed in the compressor shell, an air inlet of the machine body suction channel is formed in a front turbine cover of the compressor shell, an air outlet is formed in a rear cover of the compressor shell; the compression device comprises an eccentric driving shaft, a motor stator, a motor rotor, a dynamic scroll plate and a static scroll plate, and the motor rotor is arranged in the motor stator and is connected with the eccentric driving shaft; the dynamic scroll plate is fixed to one end of the eccentric driving shaft and mesheswith the static scroll plate to form a crescent-shaped working chamber; and the suction supercharging device is arranged in the machine body suction channel to increase the pressure and flow rate of refrigerant gas entering into the crescent-shaped working chamber. The scroll refrigeration compressor can increase the pressure and flow rate of the refrigerant gas entering into a compression chamberto ensure the operation demand of an air conditioning system.

The invention relates to an air source heat pump unit in continuous heat supplying. The air source heat pump unit in continuous heat supplying comprises a compressor unit, an indoor water heat exchanging unit, a quasi-second level compression unit, an outdoor air heat exchanging unit and a defrosting branch circuit unit; due to the comprehensive technical scheme with quasi-second level compressioncombined with the temporal and spatial segmentation principle, on one hand, a compressor is additionally provided with a gas supplementing port, and a middle plate type heat exchanger is additionallyarranged in the system so that a quasi-second level compression heat pump cycle can be formed; and on the other hand, an air source heat pump outdoor air heat exchanger is arranged into at least twobranch circuit heat taking and defrosting systems capable of independently running, a fluorine-air heat exchanging mechanism in each branch circuit is subjected to defrosting operation in turns one byone, and therefore in-turn accurate defrosting and continuous heat supplying are achieved.

The invention provides a multistage heating and multistage tempering drying type airflow open-cycle heat pump drying system. The system comprises a drying portion, a heat pump system used for generating a drying medium, and an inflowing channel and an outflowing channel which communicate with the drying portion; the drying medium flows into the drying portion through the inflowing channel, dries a to-be-dried material in the drying portion and then is discharged out of the outflowing channel; the drying portion comprises at least one drying chamber, at least two drying segments are arranged in each drying chamber, two or more drying segments are arranged sequentially in a spaced mode, and spaces between the adjacent drying segments form tempering segments; the drying medium from the inflowing channel flows through the drying segments; and the to-be-dried material is dried through one drying segment, then enters one tempering segment to be subjected to tempering, and then enters the next drying segment to be dried. According to the multistage heating and multistage tempering drying type airflow open-cycle heat pump drying system, through arrangement of the multiple heating drying segments and the multiple tempering segments, the drying production intensity of the drying portion is enhanced, and the heating energy efficiency ratios of heat pump units are greatly increased.

The invention relates to the technical field of heat management, and provides an integrated heat management system and method and an operation machine. The integrated heat management system comprises an air conditioning system, a motor heat exchange loop and a hydraulic cooling system; the motor heat exchange loop is in heat exchange connection with the air conditioning system and is suitable for auxiliary heating of the air conditioning system; the hydraulic cooling system is in heat exchange connection with the air conditioning system and is suitable for defrosting outdoor heat exchange equipment of the air conditioning system. According to the integrated heat management system and method and the operation machine, the motor waste heat can be used for assisting the air conditioning system in heating in the low-temperature environment, the heating efficiency of the air conditioning system in the low-temperature environment is improved, the utilization rate of the motor waste heat is also increased, and in addition, when the air conditioning system works, if outdoor heat exchange equipment is frosted, the air conditioning system can still work. Defrosting can be conducted through hydraulic waste heat in the hydraulic heat dissipation system, the heat exchange efficiency of the air conditioning system is guaranteed, the heating energy efficiency ratio of the air conditioning system in the low-temperature environment is increased, and the utilization rate of motor waste heat is also increased.

The invention discloses a spraying synergy electric car heat pump system. The spraying synergy electric car heat pump system comprises a compressor; a refrigerant outlet of the compressor is connectedwith a first port of a first four-way valve; a second port of the first four-way valve is connected with one end of a first bypass valve, one end of a first capillary tube throttling device and one end of a fourth bypass valve; a third port of the first four-way valve is connected with one end of an expansion valve; a fourth port of the first four-way valve is connected with one end of a third bypass valve, one end of a second capillary tube throttling device and a main ejection opening of a second sprayer; the other end of the fourth bypass valve is connected with a main ejection opening ofa first sprayer; an ejected opening of the first sprayer is connected with the other end of a third capillary tube throttling device and the other end of a second bypass valve; and an outlet of the first sprayer is connected with one end of a second heat exchanger. By arranging the two two-phase flow sprayers, expansion work can be recovered both under the heating working condition and under the refrigerating working condition, the heating efficiency is ensured, and the coefficient of performance (COP) of the heat pump system is improved.

The invention relates to a machine room air conditioner heat recovery system. The system comprises a compressor unit, a first condenser, a throttling device and an evaporator; the compressor unit andthe first condenser are connected through a heat recovery loop and a first bypass loop which are arranged in parallel, the heat recovery loop is provided with a second condenser, the second condenseris fixedly arranged on the air inlet side of a household or commercial air conditioner outdoor unit heat exchanger, the heat recovery loop and the first bypass loop are provided with a control valve used for switching the heat recovery loop or the first bypass loop, and therefore a machine room air conditioner is started or retreated out of the heat recovery mode. Heat released by the second condenser is used for preheating inlet air of the household or commercial outdoor unit heat exchanger during heating, the evaporation temperature of the outdoor unit heat exchanger is improved, and the low-temperature heating capacity and the heating energy efficiency ratio of the household or commercial air conditioner can be improved. The invention further provides a control method of the machine room air conditioner heat recovery system. The automatic control over the machine room air conditioner heat recovery system is achieved.

The invention discloses a double-source commercial air conditioner and a working method thereof. The double-source commercial air conditioner comprises a steam compression system, an economizer systemand a hot gas defrost system. According to the double-source commercial air conditioner and the working method thereof, a compressor is driven directly by a direct-combustion internal combustion engine, power transfer loss can be avoided, and the energy utilization rate is effectively improved; an air source and water source heat pump technology is coupled in the form of arranging a parallel typeair cooled heat exchanger and shell heat exchanger, a medium temperature evaporator is introduced on the basis of air replenishment of an economizer to improve the hot gas bypass defrosting technology, the cascaded utilization of waste heat energy is realized while air replenishment in the middle of the compressor is strengthened, and the heating capacity and COP of the air conditioner are effectively improved; and aiming at the characteristic changes of winter and summer environments, the air conditioner can realize multi-working condition operations of air source type and waste heat type heating and air-cooled type and water-cooled type refrigeration, the working reliability of the air conditioner is improved, and the energy efficiency ratio can be increased by 10%-15% on the basis of existing 3-5.

The invention discloses kitchen ware based on a semiconductor thermoelectric effect. The kitchen ware comprises a semiconductor refrigerator, a stove surface, a radiating device and a power module, wherein the power module is electrically connected with the semiconductor refrigerator for providing direct current power for the semiconductor refrigerator; the stove surface is fixedly arranged on a hot end polar plate of the semiconductor refrigerator; and the radiating device is arranged below a cold end polar plate of the semiconductor refrigerator. Since the kitchen ware is heated by using the semiconductor refrigerating device, the kitchen ware has a higher heating energy efficiency ratio and is more energy-saving. Certain refrigeration is also produced by the kitchen ware using the semiconductor refrigerating device during heating, so that the emission of atmospheric comprehensive heat is reduced, and the environmental temperature is improved; and air conditioning equipment can also be prevented from being additionally arranged in a working space of the kitchen ware for cooling, so that the energy consumption is further reduced.

The invention discloses an environment-friendly refrigerating composition with excellent refrigerating and heating performance. The environment-friendly refrigerating composition comprises the following components: (a) 1 to 30% of fluoroethane; (b) 1 to 60% of 1, 1, 2-trifluoroethylene; (c) 1 to 25%of a third component which is selected from 1, 1-difluoroethane and / or difluoromethane; and (d) 1 to 50% of a fourth componentwhich is selected from at least one of trifluoroiodomethane, fluoromethane or carbon dioxide. The ODP value of the environment-friendly refrigerating composition is 0, the GWP value is smaller than or equal to 200, and the environment-friendly refrigerating composition has excellent refrigerating and heating performance at the same time, can be used as a refrigerant for replacing R410A and is particularly suitable for being used as a heat transfer medium of a new energy automobile air conditioner.

A combined air-cooled heat pump set is characterized by that the water-source heat pump set is combined with the air cooled heat pump set via water circulating mechanism to form a whole. In the summer, both heat pump sets are respectively used for refrigeration. In the winter, the air cooled heat pump set is used to heat water to 21 deg.C and then the water-source heat pump set is used to further heat the water to 45 deg.C for heating indoor air.

The invention relates to an antifreezing-agent multi-path large-temperature-rise heat-extracting air-exhausting vapor-source cascading heat pump. Cascading heat pump condensers are connected seriallyso as to run, large-temperature-rise circulating water is heated in a cascading way, and large-temperature-rise fresh air is heated in a multi-path fresh air coil pipe, so that the relative humidity is reduced, indoor moisture is absorbed, and an air-exhausting vapor heat source is formed; and evaporators are connected serially so as to run, a large-temperature-drop antifreezing agent is cooled ina cascading way, and air-exhausting and temperature-dropping sensible heat, condensation latent heat and frosting latent heat are recovered tertiarily in a multi-path heat returning coil pipe. Small-flow circulation and large-temperature-rise heat exchange are carried out on two sides of the heat pump, so that the investment and the electricity consumption of a heat pump unit, various functionalterminals, a circulating pump, a pipeline and a valve are reduced. Rolling defrosting is realized through the minimum heating capacity.

The invention discloses an improved variable frequency air conditioner. A refrigeration one-way valve device with a throttling function or a plurality of refrigeration one-way valve devices with a throttling function and in parallel arrangement is / are arranged on a position, close to an evaporator, of a conveying pipeline used for connecting a condenser with the evaporator; the conducting direction of the refrigeration one-way valve device(s) points to the condenser. The improved variable frequency air conditioner is characterized in that a variable flow throttling device is arranged on a position, close to the condenser, of a conveying pipeline used for connecting the refrigeration one-way valve device(s) with the condenser. According to the invention, the refrigeration one-way valve device(s) is / are arranged on one end close to the evaporator, so that the energy efficiency ratio of refrigeration of the variable frequency air conditioner can be effectively improved; a heating throttling element is arranged on one end close to the condenser, so that the energy efficiency ratio of heating of the variable frequency air conditioner can be effectively improved. The improved variable frequency air conditioner is capable of effectively improving the year-round energy efficiency ratio of the variable frequency air conditioner, and bringing an unexpected effect.

The invention relates to an air source heat pump and water pump linkage control method and system and electronic equipment. The method comprises the steps: detecting the temperature difference of supply water and return water of all air source heat pumps which are started to operate, and for any air source heat pump, if the temperature difference of the supply water and the return water is within a preset temperature change range, keeping the current running states of the air source heat pump and the matched water pump; otherwise, adjusting the operation frequency of the water pump matched with the air source heat pump according to a preset rule till the temperature difference between the supply water and the return water is within the preset temperature change range, and therefore linkage control over the air source heat pump and the water pump is achieved. According to the technical scheme, due to the fact that the operation frequency of the matched water pump is intelligently adjusted according to the temperature difference of the supply water and the return water of the air source heat pump, system energy consumption can be effectively reduced, system operation cost is reduced, and the heating energy efficiency ratio of the system is increased.

The invention discloses a refrigerant suitable for an air source heat pump water heater, including refrigerant R134a, R417a and R407, which has passed the national environmental protection product quality supervision and inspection, and has an ozone depletion potential value ODP (<0.11, international standard ODP≤0.11) , purity 99.99%, moisture 0.001%, evaporation residue 0.0012%, acidity: not detected, appearance, colorless and transparent, no peculiar smell, low system pressure when the machine is running, low operating power consumption, high heating capacity, reaching above COP5.1 Energy efficiency: It is a high-temperature and low-pressure environmentally friendly refrigerant, especially adding cesium oxide as a catalyst, which can significantly improve the heating energy efficiency ratio of the refrigerant.

The invention discloses a transcritical carbon dioxide electric passenger car air conditioning system and a control method. The system comprises: an outlet of a compressor is connected to a first port of a four-way reversing valve, and a second port of the four-way reversing valve is connected to one end of an outdoor heat exchanger , the other end of the outdoor heat exchanger is connected to the inlet of the expander through the second channel of the regenerator; the outlet of the expander is connected to the first port of the first three-way solenoid valve; the second port of the first three-way solenoid valve is connected to the first port of the first three-way solenoid valve. The second port of the two-three-way solenoid valve, the first port of the second three-way solenoid valve is connected to the third port of the four-way reversing valve through the indoor heat exchanger, and the fourth port of the four-way reversing valve is connected to the gas-liquid separator The inlet and the outlet of the gas-liquid separator are connected to the inlet of the compressor through the first passage of the regenerator. Using natural working medium CO 2 As a refrigerant, it solves the technical problem that the existing halogenated hydrocarbon refrigerants pollute the environment.