Heat pump air conditioning system

Abstract

The utility model relates to a heat pump air conditioning system, which belongs to the technical field of air conditioners and comprises a compressor, a direct expansion type radiator, an outdoor heat exchanger, a flash tank, a three-way valve, a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve. The flash tank is connected to the direct expansion type radiator and the outdoor heat exchanger. The first electromagnetic valve is used for conducting refrigerants to flow from the flash tank to the three-way valve, the second electromagnetic valve is used for conducting refrigerants to flow from the outdoor heat exchanger to the air suction port, and the third electromagnetic valve is used for conducting refrigerants to flow from the exhaust port to the outdoor heat exchanger; the three-way valve is connected to the flash tank, the air suction port and the air supply port, and when the air conditioner operates at the low outdoor environment temperature, two-phase flow gaseous refrigerants with middle pressure are separated through the flash tank and flow back into the compressor, the gas displacement of the compressor is improved, the heating capacity of the system is improved, and the defrosting process under the continuous heating working condition can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to a heat pump air conditioning system. Background Art

[0002] The heat pump air conditioning system is a new type of air conditioning that uses the principle of air conditioning cooling in summer to achieve the purpose of heating. The heat pump air conditioning system includes a compressor, a condenser and an evaporator. When the heat pump air conditioning system is heating in winter, the compressor compresses the low-temperature and low-pressure refrigerant to form a high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant exchanges heat with the cooling medium in the condenser and heats the cooling medium, and then transports the cooling medium to the room to heat the room. The refrigerant after heat exchange in the condenser is transported to the evaporator, absorbs heat from the air in the evaporator, and then circulates to the compressor. When the evaporation temperature of the refrigerant in the evaporator is below zero and the humidity of the air reaches certain conditions, the surface of the evaporator will gradually frost.

[0003] Existing heat pump air conditioning systems, if equipped with direct expansion radiator terminals, often form a multi-terminal system with convection air conditioners. During the heating process, defrosting can be performed with the aid of the air conditioning terminals, which can prevent the radiator terminal temperature from being too low.

[0004] The biggest feature of the terminal direct expansion radiator heat pump heating system is that it only provides heat to the room, not cooling. When the system is heating, it is inevitable to consider the system's heating capacity and defrosting in low temperature environments. For heat pump systems with only a single radiator at the air conditioner terminal, the heat pump air conditioner will have low heating capacity and the radiator temperature will be too low during defrosting in low temperature environments. Utility Model Content

[0005] The utility model solves one of the technical problems in the related art at least to a certain extent.

[0006] To this end, the present application aims to provide a heat pump air-conditioning system, in which a flash device and a three-way valve are provided between the compressor and the direct expansion radiator. When operating at a low outdoor ambient temperature, the flash device is used to separate the two-phase flow gaseous refrigerant at intermediate pressure and return it to the compressor, thereby increasing its exhaust volume and thereby improving the heating capacity of the system. The defrost process under continuous heating conditions can also be realized.

[0007] In order to achieve the above object, the utility model provides a heat pump air conditioning system, which includes:

[0008] A compressor, the compressor having an air intake port, an air supply port and an air discharge port;

[0009] A direct expansion radiator, which is arranged indoors and connected to the exhaust port;

[0010] Outdoor heat exchanger;

[0011] A flasher, the flasher being connected to the direct expansion radiator and the outdoor heat exchanger respectively;

[0012] A three-way valve, the three-way valve is respectively connected to the flasher, the air intake port and the air supply port;

[0013] a first solenoid valve, the first solenoid valve being used to conduct the refrigerant from the flasher to the three-way valve;

[0014] a second solenoid valve, the second solenoid valve being used to conduct the refrigerant from the outdoor heat exchanger to the air intake port;

[0015] a third solenoid valve, the third solenoid valve being used to conduct the refrigerant to flow from the exhaust port to the outdoor heat exchanger;

[0016] a controller, the controller being electrically connected to the three-way valve, the first solenoid valve, the second solenoid valve and the third solenoid valve respectively;

[0017] The first solenoid valve and the second solenoid valve are in an open state, the third solenoid valve is in a closed state, the three-way valve is connected to the flash radiator and the air supply port, the refrigerant output by the compressor enters the flash radiator through the direct expansion radiator, the liquid refrigerant in the flash radiator flows back to the compressor through the outdoor heat exchanger, and the gaseous refrigerant in the flash radiator flows back to the compressor through the three-way valve to increase the exhaust volume of the compressor, so as to increase the heat dissipation of the direct expansion radiator;

[0018] The first solenoid valve and the third solenoid valve are in an open state, the second solenoid valve is in a closed state, the three-way valve is connected to the flasher and the air intake, a part of the refrigerant output by the compressor enters the flasher through the outdoor heat exchanger, another part of the refrigerant output by the compressor enters the flasher through the direct expansion radiator, and the refrigerant in the flasher flows back to the compressor through the three-way valve, so that the direct expansion radiator continues to dissipate heat during the defrosting process of the outdoor heat exchanger.

[0019] In the technical solution, the three-way valve is respectively connected to the flash evaporator, the air intake port and the air supply port. The flash evaporator is also connected to the direct expansion radiator and the outdoor heat exchanger. When operating at a low outdoor ambient temperature, the flash evaporator is used to separate the two-phase flow gaseous refrigerant at the intermediate pressure and return it to the compressor to increase its exhaust volume, thereby improving the heating capacity of the system and realizing the defrosting process under continuous heating conditions.

[0020] In addition, the present application also provides a heat pump air conditioning system, which includes:

[0021] A compressor, the compressor having an air intake port, an air supply port and an air discharge port;

[0022] Outdoor heat exchanger;

[0023] a direct expansion radiator, the direct expansion radiator being connected to the exhaust port;

[0024] A flasher, the flasher being connected to the direct expansion radiator and the outdoor heat exchanger respectively;

[0025] A three-way valve, the three-way valve is respectively connected to the flasher, the air intake port and the air supply port;

[0026] a first solenoid valve, the first solenoid valve being arranged on a pipeline between the flasher and the three-way valve, the first solenoid valve being used for conducting the refrigerant to flow from the flasher to the three-way valve;

[0027] a second solenoid valve, the second solenoid valve being arranged on a pipeline between the outdoor heat exchanger and the air intake port, the second solenoid valve being used for conducting the refrigerant to flow from the outdoor heat exchanger to the air intake port;

[0028] a third solenoid valve, the third solenoid valve being disposed on a pipeline between the outdoor heat exchanger and the exhaust port, the third solenoid valve being used to conduct the refrigerant from the exhaust port to the outdoor heat exchanger;

[0029] A controller, the controller being electrically connected to the three-way valve, the first solenoid valve, the second solenoid valve and the third solenoid valve, respectively, and the controller being used to control the switching of the three-way valve and the opening and closing of the first solenoid valve, the first solenoid valve and the third solenoid valve;

[0030] The controller receives the low-temperature heating signal to control the first solenoid valve and the second solenoid valve to open, controls the third solenoid valve to close, and controls the two ends of the three-way valve to connect the flash radiator and the air supply port respectively, so that the refrigerant output by the compressor enters the flash radiator through the direct expansion radiator, the liquid refrigerant in the flash radiator flows back to the compressor through the outdoor heat exchanger, and the gas refrigerant in the flash radiator flows back to the compressor through the three-way valve, so as to increase the exhaust volume of the compressor, so as to increase the heat dissipation of the direct expansion radiator;

[0031] The controller receives a defrost signal to control the first solenoid valve and the third solenoid valve to open, controls the second solenoid valve to close, and controls the two ends of the three-way valve to connect to the flasher and the air intake port respectively, so that a part of the refrigerant output by the compressor enters the flasher through the outdoor heat exchanger, and another part of the refrigerant output by the compressor enters the flasher through the direct expansion radiator, and the refrigerant in the flasher flows back to the compressor through the three-way valve, so that the direct expansion radiator continues to dissipate heat during the defrosting process of the outdoor heat exchanger.

[0032] In the technical solution, the three-way valve is respectively connected to the flash evaporator, the air intake port and the air supply port; the flash evaporator is respectively connected to the direct expansion radiator and the outdoor heat exchanger. When operating at a low outdoor ambient temperature, the flash evaporator is used to separate the two-phase flow gaseous refrigerant at the intermediate pressure and return it to the compressor to increase its exhaust volume, thereby improving the heating capacity of the system and realizing the defrosting process under continuous heating conditions.

[0033] In some embodiments of the present application, a heating element is provided in the flash device, and the heating element is used to heat the refrigerant in the flash device.

[0034] Some embodiments of the present application further include a make-up air temperature sensor, which is disposed on a pipeline between the flasher and the three-way valve, and is used to detect the temperature of the refrigerant flowing out of the flasher.

[0035] In some embodiments of the present application, the air supply temperature sensor is electrically connected to the controller, the controller is electrically connected to the heating element, and the controller controls the heating time of the heating element according to the refrigerant temperature detected by the air supply temperature sensor.

[0036] Some embodiments of the present application further include a gas supply pressure sensor, which is arranged on the pipeline between the flasher and the three-way valve, and is used to collect the pressure of the refrigerant flowing out of the flasher.

[0037] In some embodiments of the present application, the three-way valve has a first valve port, a second valve port and a third valve port, the first valve port is connected to the first solenoid valve, the second valve port is connected to the air supply port, and the third valve port is connected to the air intake port.

[0038] Some embodiments of the present application further include a first throttle member and a second throttle member, wherein the first throttle member is disposed between the flash unit and the direct expansion radiator, and the second throttle member is disposed between the flash unit and the outdoor heat exchanger.

[0039] In some embodiments of the present application, there are multiple direct expansion radiators, and the multiple direct expansion radiators are arranged in parallel between the exhaust port and the flasher.

[0040] Some embodiments of the present application further include an outdoor casing and an outdoor fan, wherein the outdoor fan and the outdoor heat exchanger are disposed in the outdoor casing, and the outdoor fan is used to drive outdoor air to flow through the outdoor heat exchanger.

[0041] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic diagram of the composition of a heat pump air conditioning system according to an embodiment of the present application;

[0043] Figure 2 is a schematic diagram of the refrigerant flow direction in the heating mode of the heat pump air conditioning system according to an embodiment of the present application;

[0044] Figure 3 is a schematic diagram of the refrigerant flow direction at the three-way valve in the heating mode of the heat pump air conditioning system according to an embodiment of the present application;

[0045] Figure 4 is a schematic diagram of the refrigerant flow direction in the heating mode of the heat pump air conditioning system according to an embodiment of the present application;

[0046] Figure 5 is a schematic diagram of the refrigerant flow direction at the flasher in the heating mode of the heat pump air conditioning system according to the embodiment of the present application;

[0047] Figure 6 is a schematic diagram of the refrigerant flow direction in the defrost mode of the heat pump air conditioning system according to an embodiment of the present application;

[0048] Figure 7 is a schematic diagram of the refrigerant flow at the three-way valve in the defrost mode of the heat pump air conditioning system according to an embodiment of the present application;

[0049] Figure 8 is a schematic diagram of the refrigerant flow direction in the defrost mode of the heat pump air conditioning system according to an embodiment of the present application;

[0050] Fig. 9 is a schematic diagram of the refrigerant flow at the flasher in the defrost mode of the heat pump air conditioning system according to an embodiment of the present application;

[0051] Fig.10 is a schematic diagram of the refrigerant flow direction in the heating mode of the heat pump air conditioning system according to an embodiment of the present application;

[0052] Fig.11It is a schematic diagram of the refrigerant flow in the defrost mode of the heat pump air-conditioning system according to an embodiment of the present application.

[0053] In the above figures: 100, compressor; 101, air intake; 102, air supply; 103, exhaust; 200, direct expansion radiator; 300, outdoor heat exchanger; 400, flasher; 500, three-way valve; 600, first solenoid valve; 700, second solenoid valve; 800, third solenoid valve; 900, first throttling device; 110, second throttling device. DETAILED DESCRIPTION

[0054] In the description of the present invention, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present utility model, unless otherwise clearly stipulated and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] In the present utility model, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0058] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0059] In the present application, the heat pump air conditioning system includes a compressor, a direct expansion radiator, an outdoor heat exchanger, a flasher, and a three-way valve. The direct expansion radiator heat pump air conditioning system only supplies heat to the indoor space, but does not supply cooling to the indoor space. The heating cycle of the air conditioner is performed by using a compressor, a direct expansion radiator, an expansion valve, and an outdoor heat exchanger. The heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0060] The compressor compresses the refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the direct expansion radiator. The direct expansion radiator condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0061] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0062] As attached Figures 1 to 9 As shown, in an exemplary embodiment of the heat pump air conditioning system of the utility model, the heat pump air conditioning system includes a compressor 100, and the compressor 100 has an air intake port 101, an air supply port 102, and an air discharge port 103. The low-temperature and low-pressure refrigerant enters the compressor 100 through the air intake port 101, and then is compressed in the compressor 100 to form a high-temperature and high-pressure refrigerant.

[0063] The heat pump air conditioning system includes a direct expansion radiator 200 . The direct expansion radiator 200 is disposed indoors and connected to the exhaust port 103 .

[0064] The heat pump air conditioning system includes an outdoor heat exchanger 300 , and the outdoor heat exchanger 300 is used to perform heat exchange between the refrigerant flowing in the heat transfer pipe of the outdoor heat exchanger 300 and the outdoor air.

[0065] The heat pump air conditioning system includes a flash unit 400 , which is connected to the direct expansion radiator 200 and the outdoor heat exchanger 300 , respectively.

[0066] The heat pump air conditioning system comprises a three-way valve 500 , which is connected to the flasher 400 , the air intake port 101 and the air supply port 102 respectively.

[0067] The heat pump air conditioning system includes a first solenoid valve 600 , which is disposed on a pipeline between the flasher 400 and the three-way valve 500 . The first solenoid valve 600 is used to conduct the refrigerant from the flasher 400 to the three-way valve 500 .

[0068] The heat pump air conditioning system includes a second solenoid valve 700 , which is disposed on a pipeline between the outdoor heat exchanger 300 and the air intake port 101 . The second solenoid valve 700 is used to conduct refrigerant from the outdoor heat exchanger 300 to the air intake port 101 .

[0069] The heat pump air conditioning system includes a third solenoid valve 800 , which is disposed on a pipeline between the outdoor heat exchanger 300 and the exhaust port 103 , and is used to conduct refrigerant from the exhaust port 103 to the outdoor heat exchanger 300 .

[0070] The heat pump air conditioning system includes a controller, which is electrically connected to the three-way valve 500, the first solenoid valve 600, the first solenoid valve 600 and the third solenoid valve 800, and is used to control the switching of the three-way valve 500 and the opening and closing of the first solenoid valve 600, the first solenoid valve 600 and the third solenoid valve 800.

[0071] The first solenoid valve 600 and the second solenoid valve 700 are in an open state, the third solenoid valve 800 is in a closed state, the three-way valve 500 is connected to the flash radiator 400 and the air supply port 102, the refrigerant output by the compressor 100 enters the flash radiator 400 through the direct expansion radiator 200, the liquid refrigerant in the flash radiator 400 flows back to the compressor 100 through the outdoor heat exchanger 300, and the gaseous refrigerant in the flash radiator 400 flows back to the compressor 100 through the three-way valve 500 to increase the exhaust volume of the compressor 100, so as to increase the heat dissipation of the direct expansion radiator 200.

[0072] The first solenoid valve 600 and the third solenoid valve 800 are in an open state, the second solenoid valve 700 is in a closed state, the three-way valve 500 is connected to the flasher 400 and the air intake 101, a part of the refrigerant output by the compressor 100 enters the flasher 400 through the outdoor heat exchanger 300, and another part of the refrigerant output by the compressor 100 enters the flasher 400 through the direct expansion radiator 200, and the refrigerant in the flasher 400 flows back to the compressor 100 through the three-way valve 500, so that the direct expansion radiator 200 continues to dissipate heat during the defrosting process of the outdoor heat exchanger 300.

[0073] Through the above technical solution, the three-way valve 500 is respectively connected to the flasher 400, the air inlet 101 and the air supply port 102, and the flasher 400 is also connected to the direct expansion radiator 200 and the outdoor heat exchanger 300. When the outdoor environment temperature is low, the flasher 400 is used to separate the two-phase flow gaseous refrigerant of the intermediate pressure to return to the compressor 100, thereby increasing its exhaust volume and further improving the heating capacity of the system, thereby realizing the function of rapidly heating the indoor air. The defrosting process under the continuous heating condition can also be realized.

[0074] In the defrost mode, the third solenoid valve 800 connects the exhaust port 103 and the outdoor heat exchanger 300 , and the outdoor heat exchanger 300 releases heat to the outside for defrosting. The first solenoid valve 600 connects the flasher 400 and the three-way valve 500 , and the three-way valve 500 connects the air intake port 101 .

[0075] Part of the refrigerant gas flowing out of the exhaust port 103 enters the outdoor heat exchanger 300, and the other part enters the direct expansion radiator 200. The refrigerant flowing out of the outdoor heat exchanger 300 and the refrigerant flowing out of the direct expansion radiator 200 enter the flash unit 400 and merge, and then flow back to the air intake port 101 through the three-way valve 500 for the next refrigerant cycle.

[0076] The compressor 100, the direct expansion radiator 200, the flasher 400, the first solenoid valve 600, and the three-way valve 500 form a heating circuit. The working state of the direct expansion radiator 200 is not changed, and the indoor space is still heated, thereby achieving the function of defrosting without affecting the indoor temperature, thereby improving user comfort.

[0077] In the heating mode, when the outdoor temperature is within the preset temperature range and the air conditioning system can reach the preset temperature by working at a low load, the first solenoid valve 600 is closed, that is, the flasher 400 is not needed to supplement air and increase enthalpy for the compressor 100. When the outdoor temperature is lower than the preset value, the air conditioning system needs to work at a higher load. At this time, the first solenoid valve 600 is opened, and the flasher 400 is used to supplement air and increase enthalpy for the compressor 100, thereby improving the energy efficiency of the compressor 100 and improving the low-temperature heating capacity of the air conditioning system.

[0078] In some embodiments, a heating element is provided in the flasher 400, and the heating element is used to heat the refrigerant in the flasher 400. The heating element releases heat to the low-temperature and low-pressure two-phase refrigerant, and the two-phase refrigerant that absorbs heat becomes low-temperature and low-pressure superheated steam.

[0079] During low-temperature heating, the flash unit 400 is used to supplement air to the compressor 100 to increase enthalpy, thereby improving the air intake of the compressor 100 and enhancing the efficiency of the compressor 100, further improving the system capacity during low-temperature heating and increasing the low-temperature heating amount.

[0080] When the air conditioner is working, the high-pressure refrigerant vapor in the flash evaporator 400 is separated into gas and liquid. The flash evaporator 400 can deliver the separated gas-phase refrigerant to the compressor 100 to replenish air and increase enthalpy for the compressor 100. It can not only lower its temperature after mixing with the high-temperature gas compressed in the previous stage, but also reduce the amount of work required for the next stage impeller to compress the gas, thereby improving the working performance of the air conditioning system.

[0081] The heating element can heat the flasher 400, and can heat the refrigerant in the flasher 400, providing additional heat for the vaporization of the refrigerant, thereby accelerating the vaporization of the refrigerant, improving the gas-liquid two-phase conversion efficiency of the refrigerant, and preventing a large amount of liquid refrigerant from entering the compressor 100, thereby reducing the risk of liquid in the compressor 100, ensuring the structural reliability of the compressor 100, extending the service life of the compressor 100, and improving the working performance of the air conditioner.

[0082] By providing a heater in the flasher 400 , the gas-liquid two-phase conversion efficiency of the refrigerant can be improved, and the risk of liquid being carried in the compressor 100 during air replenishment can be reduced, thereby ensuring the structural reliability of the compressor 100 and extending the service life of the compressor 100.

[0083] In some embodiments, the flasher 400 includes a liquid inlet, a liquid outlet and a jet outlet. The liquid inlet and outlet of the flasher 400 are provided with corresponding inlet and outlet pipelines, and the inlet and outlet pipelines are provided with corresponding liquid spray holes and oil return holes. The liquid spray holes are located at the end of the inlet and outlet pipeline in the flasher 400 away from the liquid inlet and outlet. The jet outlet of the flasher 400 is provided with a corresponding jet pipeline, and the end of the jet pipeline close to the liquid inlet and outlet is provided with a seal.

[0084] A first throttling member 900 is provided at the liquid inlet of the flash igniter 400, and a second throttling member 110 is provided at the liquid outlet of the flash igniter 400. By adjusting the opening of the first throttling member 900 and the second throttling member 110, the refrigerant pressure inside the flash igniter 400, the flow rate and evaporation pressure of the refrigerant passing through the flash igniter 400 are adjusted, thereby controlling the refrigerant flow rate of the injection port of the flash igniter 400.

[0085] In some embodiments, the heat pump air conditioning system includes a supplementary air temperature sensor, which is disposed on a pipeline between the flasher 400 and the three-way valve 500 and is used to detect the temperature of the refrigerant flowing out of the flasher 400 .

[0086] In some embodiments, the supplementary air temperature sensor is electrically connected to the controller, the controller is electrically connected to the heating element, and the controller controls the heating time of the heating element according to the refrigerant temperature detected by the supplementary air temperature sensor.

[0087] The heating element improves the gas-liquid two-phase conversion efficiency of the refrigerant by heating the flasher 400. Therefore, the heating temperature of the heating element and the temperature of the refrigerant directly affect the vaporization efficiency of the refrigerant, thereby affecting whether the risk of liquid in the compressor 100 can be effectively avoided.

[0088] The temperature sensor is electrically connected to the controller, and the controller is electrically connected to the heating element. In this way, the temperature sensor can detect the temperature of the refrigerant flowing out of the flasher 400, and then send the detection data to the controller. The controller can determine whether the temperature of the refrigerant is appropriate at this time, and control the operation of the heating element accordingly based on the judgment result. This can not only ensure the gas-liquid two-phase conversion efficiency of the refrigerant in the flasher 400, prevent the liquid refrigerant from entering the compressor 100, but also avoid the heating element from generating unnecessary power consumption, avoid energy waste, and improve the energy efficiency of the air-conditioning system.

[0089] In some embodiments, the heat pump air conditioning system includes a supplementary air pressure sensor, which is disposed on a pipeline between the flasher 400 and the three-way valve 500 and is used to collect the pressure of the refrigerant flowing out of the flasher 400 .

[0090] In some embodiments, the three-way valve 500 has a first valve port, a second valve port and a third valve port, the first valve port is connected to the first solenoid valve 600 , the second valve port is connected to the air supply port 102 , and the third valve port is connected to the air intake port 101 .

[0091] In some embodiments, the three-way valve 500 is an electric three-way valve 500, which is electrically connected to a controller to control the connection and disconnection between the first valve port, the second valve port, and the third valve port of the three-way valve 500, thereby controlling the flow direction of the refrigerant in the three-way valve 500, thereby achieving heating or defrosting of the air-conditioning system.

[0092] The purpose of the three-way valve 500 is to achieve flow path switching between various connecting pipelines. By switching the valve position of the three-way valve 500, different refrigerant flow paths are achieved, thereby achieving different operating modes of the heat pump air-conditioning system.

[0093] As attached Figures 5 to 9As shown, in some embodiments, the heat pump air conditioning system includes a first throttle 900 and a second throttle 110 , wherein the first throttle 900 is disposed between the flash unit 400 and the direct expansion radiator 200 , and the second throttle 110 is disposed between the flash unit 400 and the outdoor heat exchanger 300 .

[0094] In some embodiments, the first throttle 900 is a thermal expansion valve, and the second throttle 110 is a thermal expansion valve.

[0095] In some embodiments, the first throttling element 900 is an electronic expansion valve, and the second throttling element 110 is an electronic expansion valve. The electronic expansion valve can expand the liquid refrigerant in a high-temperature and high-pressure state into a liquid refrigerant in a low-pressure state.

[0096] In some embodiments, first filters are provided in the pipes on both sides of the first throttling member 900 for filtering the refrigerant entering and exiting the first throttling member 900 , thereby preventing impurities in the refrigerant from blocking the first throttling member 900 .

[0097] In some embodiments, second filters are provided in the pipes on both sides of the second throttling member 110 for filtering the refrigerant entering and exiting the second throttling member 110 , thereby preventing impurities in the refrigerant from blocking the second throttling member 110 .

[0098] The controller is electrically connected to the compressor 100 and the outdoor heat exchanger 300 to control operations of the compressor 100 and the outdoor heat exchanger 300 .

[0099] When the outdoor temperature is within the preset temperature range, the system heating amount meets the user's requirements, the first solenoid valve 600 and the third solenoid valve 800 are closed, and the second solenoid valve 700 is opened. The high-temperature and high-pressure refrigerant output by the compressor 100 enters the direct expansion radiator 200. The refrigerant after releasing heat becomes a high-pressure liquid refrigerant and enters the first electronic expansion valve and the second electronic expansion valve for throttling. The throttled refrigerant becomes a low-temperature and low-pressure two-phase flow state and then enters the outdoor heat exchanger 300 to absorb the heat from the outdoor environment. Finally, the refrigerant flows out of the outdoor heat exchanger 300 in a gaseous form, flows back to the compressor 100, is compressed again and discharged, and re-enters the direct expansion radiator 200 to release heat, thereby completing the heating cycle.

[0100] During the above heating cycle, in order to increase the heating capacity of the system, the first solenoid valve 600 can be opened, the electric three-way valve 500 is connected to the air supply port 102, and the gaseous refrigerant in the flasher 400 will flow back to the air supply port 102 to increase the heating capacity of the system. The liquid refrigerant in the flasher 400 is throttled again by the second electronic expansion valve, flows into the outdoor heat exchanger 300 to absorb heat, and then flows back to the air intake port 101.

[0101] When the outdoor temperature is lower than the preset temperature, the system heating capacity will be significantly reduced. At this time, the first solenoid valve 600 and the second solenoid valve 700 are opened, and the third solenoid valve 800 is closed. The high-temperature and high-pressure refrigerant output by the compressor 100 enters the direct expansion radiator 200. The refrigerant after releasing heat becomes a high-pressure liquid refrigerant and enters the first electronic expansion valve for throttling. The throttled refrigerant enters the flash ignitor 400, and the gas-liquid two-phase refrigerant is separated in the flash ignitor 400. The gaseous refrigerant flows out from the top of the flash ignitor 400 and flows back to the air inlet 102 through the three-way valve 500 to increase the system heating capacity.

[0102] The liquid refrigerant flows out from the bottom of the flash unit 400 and is throttled again by the second electronic expansion valve to become a low-temperature and low-pressure two-phase flow refrigerant. The low-pressure two-phase flow refrigerant flows into the outdoor heat exchanger 300 to absorb outdoor heat and become a gas-phase refrigerant, and then flows back to the air intake 101 for recompression, thereby completing the heating cycle in a low-temperature environment.

[0103] When the first solenoid valve 600 is opened to increase the system heating capacity by supplementary air, in order to ensure that the refrigerant flowing into the supplementary air port 102 from the flasher 400 is completely gas-phase refrigerant, the first electronic expansion valve and the second electronic expansion valve are usually used to adjust the supplementary air superheat, and the supplementary air pressure sensor obtains the pressure of the refrigerant flowing out of the flasher 400, and the saturation temperature is obtained by the corresponding pressure.

[0104] When the superheat of the supplementary air is a negative value, the opening of the second electronic expansion valve is increased and the opening of the first electronic expansion valve is reduced. When the superheat of the supplementary air is too large, the opening of the first electronic expansion valve is increased and the opening of the second electronic expansion valve is reduced.

[0105] When heating is performed under low temperature conditions, starting the flasher 400 to replenish air to the compressor 100 can greatly reduce refrigerant migration and promote refrigerant circulation at the moment of low temperature heating startup.

[0106] During the low-temperature defrosting process, the direct expansion radiator 200 continues to heat and blow hot air without affecting user use. At the same time, during the defrosting process, the air replenishment can be turned on to increase the refrigerant flow of the direct expansion radiator 200 to ensure the heating effect, while reducing the refrigerant circulation volume of the outdoor heat exchanger 300 to reduce the risk of liquid return.

[0107] As attached Figure 10 to Figure 11 As shown, in some embodiments, there are multiple direct expansion radiators 200, and multiple direct expansion radiators 200 are arranged in parallel between the exhaust port 103 and the flasher 400. Multiple direct expansion radiators 200 are arranged in parallel to improve heat exchange efficiency.

[0108] The high-temperature and high-pressure refrigerant output by the compressor enters into a plurality of direct expansion radiators 200 at the same time. After releasing the heat, the refrigerant becomes a high-pressure liquid refrigerant and enters into the first electronic expansion valve for throttling. The throttled refrigerant enters into the flash evaporator 400. In the flash evaporator 400, the gaseous and liquid two-phase refrigerant is separated. The gaseous refrigerant flows out from the top of the flash evaporator 400 and flows back to the air supply port 102 through the three-way valve 500.

[0109] In some embodiments, the heat pump air conditioning system includes an outdoor casing and an outdoor fan. The outdoor fan and the outdoor heat exchanger 300 are arranged in the outdoor casing. The outdoor fan is used to drive outdoor air to flow through the outdoor heat exchanger 300.

[0110] The compressor 100 and the flasher 400 are both arranged in the outdoor casing, and the outdoor casing protects the compressor 100, the flasher 400, the outdoor fan and the outdoor heat exchanger 300, preventing the compressor 100, the flasher 400, the outdoor fan and the outdoor heat exchanger 300 from being damaged by external impact, thereby ensuring the normal operation of the air-conditioning system.

[0111] In some embodiments, the outdoor heat exchanger 300 includes heat exchange fins to expand the contact area between the outdoor air and the refrigerant transmitted in the outdoor heat exchanger 300, thereby improving the heat exchange efficiency between the outdoor air and the refrigerant.

[0112] The working principle of the air replenishment and enthalpy increase of the flash igniter 400 is as follows: the high-temperature and high-pressure refrigerant gas output by the compressor 100 enters the direct expansion radiator 200 to release heat, and enters the flash igniter 400 through the first throttling device 900. The flash igniter 400 separates the gas refrigerant flashed out after throttling according to the physical principle that the density of gas is less than the density of liquid, and is sucked into the air replenishment port 102. The liquid refrigerant after flashing is throttled by the second throttling device 110 and becomes a low-temperature and low-pressure state and enters the outdoor heat exchanger 300. After absorbing the ambient heat, it becomes a low-temperature and low-pressure gas and enters the air intake port 101. The compressor 100 compresses this part of the refrigerant to an intermediate pressure, and is mixed with the intermediate-pressure refrigerant gas at the air replenishment port 102 and is further compressed until it becomes a high-temperature and high-pressure refrigerant gas, and the cycle continues.

[0113] In addition, the present application also provides a heat pump air conditioning system, which includes a compressor 100 , and the compressor 100 has an air intake port 101 , an air supply port 102 and an air exhaust port 103 .

[0114] The heat pump air conditioning system includes an outdoor heat exchanger 300 .

[0115] The heat pump air conditioning system includes a direct expansion radiator 200, which is connected to the exhaust port 103. The direct expansion radiator 200 has the characteristics of clean and environmentally friendly heat source, low cost and high comfort. The direct expansion radiator 200 absorbs heat by evaporation and expansion of refrigerant.

[0116] The heat pump air conditioning system includes a flash unit 400 , which is connected to the direct expansion radiator 200 and the outdoor heat exchanger 300 , respectively.

[0117] The heat pump air conditioning system comprises a three-way valve 500 , which is connected to the flasher 400 , the air intake port 101 and the air supply port 102 respectively.

[0118] The heat pump air conditioning system includes a first solenoid valve 600 , which is disposed on a pipeline between the flasher 400 and the three-way valve 500 . The first solenoid valve 600 is used to conduct the refrigerant from the flasher 400 to the three-way valve 500 .

[0119] The heat pump air conditioning system includes a second solenoid valve 700 , which is disposed on a pipeline between the outdoor heat exchanger 300 and the air intake port 101 . The second solenoid valve 700 is used to conduct refrigerant from the outdoor heat exchanger 300 to the air intake port 101 .

[0120] The heat pump air conditioning system includes a third solenoid valve 800 , which is disposed on a pipeline between the outdoor heat exchanger 300 and the exhaust port 103 , and is used to conduct refrigerant from the exhaust port 103 to the outdoor heat exchanger 300 .

[0121] The heat pump air conditioning system includes a controller, which is electrically connected to the three-way valve 500, the first solenoid valve 600, the first solenoid valve 600 and the third solenoid valve 800, and is used to control the switching of the three-way valve 500 and the opening and closing of the first solenoid valve 600, the first solenoid valve 600 and the third solenoid valve 800.

[0122] The controller receives the low-temperature heating signal to control the first solenoid valve 600 and the second solenoid valve 700 to be opened, controls the third solenoid valve 800 to be closed, and controls the two ends of the three-way valve 500 to be connected to the flash radiator 400 and the air supply port 102 respectively. The refrigerant output by the compressor 100 enters the flash radiator 400 through the direct expansion radiator 200, and the liquid refrigerant in the flash radiator 400 flows back to the compressor 100 through the outdoor heat exchanger 300, and the gas refrigerant in the flash radiator 400 flows back to the compressor 100 through the three-way valve 500, so as to increase the exhaust volume of the compressor 100, so as to increase the heat dissipation of the direct expansion radiator 200.

[0123] The controller receives the defrost signal to control the first solenoid valve 600 and the third solenoid valve 800 to open, controls the second solenoid valve 700 to be closed, and controls the two ends of the three-way valve 500 to connect to the flasher 400 and the air intake port 101 respectively. A part of the refrigerant output by the compressor 100 enters the flasher 400 through the outdoor heat exchanger 300, and another part of the refrigerant output by the compressor 100 enters the flasher 400 through the direct expansion radiator 200. The refrigerant in the flasher 400 flows back to the compressor 100 through the three-way valve 500, so that the direct expansion radiator 200 continues to dissipate heat during the defrosting process of the outdoor heat exchanger 300.

[0124] Through the above technical scheme, an intermediate air supply structure is introduced into the air-conditioning system. When the air conditioner is in the low-temperature heating mode, the first solenoid valve 600 and the second solenoid valve 700 are started so that the refrigerant flows out of the compressor 100, passes through the direct expansion radiator 200, and then flows into the flash radiator 400 from the inlet. One path of liquid refrigerant flows out from the first outlet of the flash radiator 400 and flows into the outdoor heat exchanger 300 for heat exchange, and the other path of gaseous refrigerant flows out from the second outlet of the flash radiator 400 and flows into the compressor 100 through the first solenoid valve 600 and the three-way valve 500, thereby performing a boosting operation on the compressor 100, improving the low-temperature heating capacity of the compressor 100, and providing a better user experience.

[0125] In some embodiments, the heat pump air conditioning system includes an exhaust temperature sensor, which is disposed on a pipeline connected to the exhaust port 103 . The exhaust temperature sensor is used to collect the exhaust temperature of the compressor 100 .

[0126] In some embodiments, the heat pump air conditioning system includes a first refrigerant circuit, which sequentially connects a compressor 100 , a direct expansion radiator 200 , a flash unit 400 , an outdoor heat exchanger 300 , and a second solenoid valve 700 .

[0127] The heat pump air conditioning system includes a second refrigerant circuit, which is connected in sequence to a compressor 100 , a direct expansion radiator 200 , a flash unit 400 , a first solenoid valve 600 , and a three-way valve 500 .

[0128] The heat pump air conditioning system includes a third refrigerant circuit, which sequentially connects the compressor 100, the third solenoid valve 800, the outdoor heat exchanger 300, the flasher 400, and the three-way valve 500.

[0129] The heat pump air conditioning system includes a fourth refrigerant circuit, which sequentially connects the compressor 100, the direct expansion radiator 200, the flash unit 400, the first solenoid valve 600, and the three-way valve 500.

[0130] The first solenoid valve 600 and the second solenoid valve 700 are in an open state, the third solenoid valve 800 is in a closed state, the three-way valve 500 connects the first solenoid valve 600 and the air supply port 102 respectively, and the refrigerant flows along the first refrigerant circuit and the second refrigerant circuit respectively. The second refrigerant circuit is used to increase the exhaust volume of the compressor 100 to increase the heating capacity of the direct expansion radiator 200.

[0131] The first solenoid valve 600 and the third solenoid valve 800 are in the open state, the second solenoid valve 700 is in the closed state, the three-way valve 500 connects the first solenoid valve 600 and the air supply port 102 respectively, and the refrigerant flows along the third refrigerant circuit and the fourth refrigerant circuit respectively, so that the direct expansion radiator 200 continues to dissipate heat in the defrost mode.

[0132] In some embodiments, the heat pump air conditioning system includes an air supply branch, one end of the air supply branch is connected to the air supply port 102 , and the other end is connected to the three-way valve 500 .

[0133] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A heat pump air conditioning system, characterized in that: It includes: A compressor, the compressor having an air intake port, an air supply port and an air discharge port; A direct expansion radiator, the direct expansion radiator is arranged indoors, and the direct expansion radiator is connected to the exhaust port; Outdoor heat exchanger; A flasher, the flasher being connected to the direct expansion radiator and the outdoor heat exchanger respectively; A three-way valve, the three-way valve is respectively connected to the flasher, the air intake port and the air supply port; a first solenoid valve, the first solenoid valve being used to conduct the refrigerant from the flasher to the three-way valve; a second solenoid valve, the second solenoid valve being used to conduct the refrigerant from the outdoor heat exchanger to the air intake port; a third solenoid valve, the third solenoid valve being used to conduct the refrigerant to flow from the exhaust port to the outdoor heat exchanger; a controller, the controller being electrically connected to the three-way valve, the first solenoid valve, the second solenoid valve and the third solenoid valve respectively; The first solenoid valve and the second solenoid valve are in an open state, the third solenoid valve is in a closed state, the three-way valve is connected to the flash unit and the air supply port, the high-temperature and high-pressure gaseous refrigerant output by the compressor enters the flash unit through the direct expansion radiator, the liquid refrigerant in the flash unit flows back to the compressor through the outdoor heat exchanger, and the gaseous refrigerant in the flash unit flows back to the compressor through the three-way valve; The first solenoid valve and the third solenoid valve are in an open state, the second solenoid valve is in a closed state, the three-way valve is connected to the flash unit and the air intake port, a part of the high-temperature and high-pressure gaseous refrigerant output by the compressor enters the flash unit through the outdoor heat exchanger, another part of the high-temperature and high-pressure gaseous refrigerant output by the compressor enters the flash unit through the direct expansion radiator, and the refrigerant in the flash unit flows back to the compressor through the three-way valve.

2. A heat pump air conditioning system, characterized in that: It includes: A compressor, the compressor having an air intake port, an air supply port and an air discharge port; Outdoor heat exchanger; A direct expansion radiator, the direct expansion radiator is arranged indoors, and the direct expansion radiator is connected to the exhaust port; A flasher, the flasher being connected to the direct expansion radiator and the outdoor heat exchanger respectively; A three-way valve, the three-way valve is respectively connected to the flasher, the air intake port and the air supply port; a first solenoid valve, the first solenoid valve being arranged on a pipeline between the flasher and the three-way valve, the first solenoid valve being used for conducting the refrigerant to flow from the flasher to the three-way valve; a second solenoid valve, the second solenoid valve being arranged on a pipeline between the outdoor heat exchanger and the air intake port, the second solenoid valve being used for conducting the refrigerant to flow from the outdoor heat exchanger to the air intake port; a third solenoid valve, the third solenoid valve being disposed on a pipeline between the outdoor heat exchanger and the exhaust port, the third solenoid valve being used to conduct the refrigerant from the exhaust port to the outdoor heat exchanger; A controller, the controller being electrically connected to the three-way valve, the first solenoid valve, the second solenoid valve and the third solenoid valve, respectively, and the controller being used to control the switching of the three-way valve and the opening and closing of the first solenoid valve, the first solenoid valve and the third solenoid valve; The controller receives the low-temperature heating signal to control the first solenoid valve and the second solenoid valve to open, controls the third solenoid valve to close, and controls the two ends of the three-way valve to connect the flash radiator and the air supply port respectively, so that the refrigerant output by the compressor enters the flash radiator through the direct expansion radiator, the liquid refrigerant in the flash radiator flows back to the compressor through the outdoor heat exchanger, and the gas refrigerant in the flash radiator flows back to the compressor through the three-way valve, so as to increase the exhaust volume of the compressor, so as to increase the heat dissipation of the direct expansion radiator; The controller receives a defrost signal to control the first solenoid valve and the third solenoid valve to open, controls the second solenoid valve to close, and controls the two ends of the three-way valve to connect to the flasher and the air intake port respectively, so that a part of the refrigerant output by the compressor enters the flasher through the outdoor heat exchanger, and another part of the refrigerant output by the compressor enters the flasher through the direct expansion radiator, and the refrigerant in the flasher flows back to the compressor through the three-way valve, so that the direct expansion radiator continues to dissipate heat during the defrosting process of the outdoor heat exchanger.

3. The heat pump air conditioning system according to claim 1 or 2, characterized in that: A heating element is arranged in the flash device, and the heating element is used to heat the refrigerant in the flash device.

4. The heat pump air conditioning system according to claim 3, characterized in that: It also includes an air supply temperature sensor, which is arranged on the pipeline between the flasher and the three-way valve, and is used to detect the temperature of the refrigerant flowing out of the flasher.

5. The heat pump air conditioning system according to claim 4, characterized in that: The supplementary air temperature sensor is electrically connected to the controller, and the controller is electrically connected to the heating element. The controller controls the heating time of the heating element according to the refrigerant temperature detected by the supplementary air temperature sensor.

6. The heat pump air conditioning system according to claim 1 or 2, characterized in that: It also includes a gas supplement pressure sensor, which is arranged on the pipeline between the flasher and the three-way valve, and is used to collect the pressure of the refrigerant flowing out of the flasher.

7. The heat pump air conditioning system according to claim 1 or 2, characterized in that: The three-way valve has a first valve port, a second valve port and a third valve port, the first valve port is connected to the first solenoid valve, the second valve port is connected to the air supply port, and the third valve port is connected to the air intake port.

8. The heat pump air conditioning system according to claim 1 or 2, characterized in that: The device also includes a first throttle and a second throttle. The first throttle is disposed between the flash unit and the direct expansion radiator, and the second throttle is disposed between the flash unit and the outdoor heat exchanger.

9. The heat pump air conditioning system according to claim 1 or 2, characterized in that: There are multiple direct expansion radiators, and the multiple direct expansion radiators are arranged in parallel between the exhaust port and the flasher.

10. The heat pump air conditioning system according to claim 1 or 2, characterized in that: It also includes an outdoor casing and an outdoor fan. The outdoor fan and the outdoor heat exchanger are arranged in the outdoor casing. The outdoor fan is used to drive outdoor air to flow through the outdoor heat exchanger.

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