Heat pump air conditioning system
By designing multiple indoor heat exchangers and throttling devices in the air-conditioning system, constant temperature or heating and dehumidification is achieved without using additional heating devices, and the refrigeration efficiency is improved, solving the problem of insufficient CO2 refrigeration performance .
Patent Information
- Application Number
- CN202323641005.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2033-12-29
AI Technical Summary
When existing air conditioning systems use CO2 as refrigerant, the refrigeration performance is weak, and additional heating devices are required during constant temperature or heating dehumidification, resulting in low energy efficiency.
A heat pump air conditioning system is designed, including multiple indoor heat exchangers and throttling devices. By using multiple indoor heat exchangers in dehumidification mode to achieve constant temperature or heating dehumidification, the use of additional heating devices is avoided and refrigerated. Improve refrigeration efficiency in mode.
It is achieved without reducing the energy efficiency of the air conditioning system, and the cooling efficiency is improved, thereby avoiding the reduction of the cooling efficiency due to insufficient heat exchange of refrigerant.
Smart Images
Figure CN222210553U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of air conditioners, in particular to a heat pump air conditioning system. Background Art
[0002] As a household appliance with a high frequency of use, air conditioners play an important role in improving our living environment. For example, when the indoor humidity is high, the air conditioning system turns on the dehumidification mode, the surface temperature of the evaporator drops, and the water vapor in the air liquefies and condenses into water droplets. The water droplets are collected in the water tank. After being filtered by the filter, the water in the water tank can be discharged to the outside through the drainage pipe, thereby achieving the purpose of indoor dehumidification. Generally speaking, within a certain temperature range, the lower the surface temperature of the evaporator, the better the dehumidification effect.
[0003] As a new generation of clean refrigerant, CO2 is non-toxic, harmless, and environmentally friendly, making it a very promising refrigerant. However, CO2's cooling performance is not as good as its heating performance, and even has certain shortcomings compared to traditional refrigerants. In addition, in order to ensure indoor comfort, the air conditioning system usually requires constant temperature dehumidification or even heating dehumidification, that is, the indoor air needs to be cooled and dehumidified before heating to maintain the indoor temperature. At this time, an additional heating device may need to be installed inside the air conditioner to heat the indoor air, which may reduce the overall energy efficiency of the air conditioning system.
[0004] Accordingly, the art needs a new technical solution to solve the above problems. Utility Model Content
[0005] In order to solve at least one of the above problems in the prior art, that is, to solve the problems of poor refrigeration capacity and low energy efficiency of the existing air-conditioning system, the present application provides a heat pump air-conditioning system, which includes:
[0006] compressor;
[0007] an outdoor heat exchanger, wherein a first port of the outdoor heat exchanger is in communication with an exhaust port of the compressor;
[0008] an ejector, wherein an inlet of the ejector is in communication with a second port of the outdoor heat exchanger;
[0009] a first indoor heat exchanger, wherein a first port of the first indoor heat exchanger is in communication with an outlet of the ejector;
[0010] a gas-liquid separator, wherein the inlet of the gas-liquid separator is communicated with the second port of the first indoor heat exchanger, and the exhaust port of the gas-liquid separator is communicated with the suction port of the compressor;
[0011] a first throttling device, one end of which is in communication with a liquid discharge port of the gas-liquid separator;
[0012] a second indoor heat exchanger, wherein a first port of the second indoor heat exchanger is connected to the other end of the first throttling device, and a second port of the second indoor heat exchanger is connected to the injection port of the ejector;
[0013] a third indoor heat exchanger, wherein a first port of the third indoor heat exchanger is communicated with an exhaust port of the compressor, and a second port of the third indoor heat exchanger is communicated with a second port of the outdoor heat exchanger;
[0014] The first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are arranged in the same air supply channel, and the third indoor heat exchanger is located downstream of the second indoor heat exchanger.
[0015] In the case of adopting the above technical solution, when the air conditioning system is in dehumidification mode, the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are all in working state, and the indoor air cooled and dehumidified by the first indoor heat exchanger and the second indoor heat exchanger continues to be heated by the third indoor heat exchanger and then flows into the room again, which can achieve constant temperature dehumidification or even heating dehumidification without setting up an additional heating device, thus avoiding reducing the overall energy efficiency of the air conditioning system or the cooling capacity of the air conditioning. In cooling mode, the first indoor heat exchanger and the second indoor heat exchanger are in working state, and after the indoor air is cooled by the first indoor heat exchanger, the second indoor heat exchanger can further cool the indoor air, thus avoiding the reduction of cooling efficiency due to insufficient heat exchange of the refrigerant.
[0016] In a preferred technical solution of the above-mentioned heat pump air-conditioning system, the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are arranged side by side along the air supply direction.
[0017] When the above technical solution is adopted, it is beneficial to install and set up the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger.
[0018] In a preferred technical solution of the above-mentioned heat pump air-conditioning system, the first indoor heat exchanger is located upstream of the second indoor heat exchanger.
[0019] When the above technical solution is adopted, the temperature of the first indoor heat exchanger is higher than the temperature of the second indoor heat exchanger. After the indoor air is initially cooled by the first indoor heat exchanger, it can continue to be further cooled by the first indoor heat exchanger, thereby ensuring the improvement of cooling efficiency.
[0020] In the preferred technical solution of the above-mentioned heat pump air-conditioning system, the heat pump air-conditioning system also includes a four-way valve, and the first interface, the second interface, the third interface and the fourth interface of the four-way valve are respectively connected to the exhaust port of the compressor, the first port of the outdoor heat exchanger, the air intake port of the compressor and the exhaust port of the gas-liquid separator.
[0021] In the preferred technical solution of the above-mentioned heat pump air-conditioning system, the third indoor heat exchanger is arranged in parallel with the outdoor heat exchanger, a branch point is arranged between the exhaust port of the compressor and the first interface of the four-way valve, and the first port of the third indoor heat exchanger is connected to the branch point.
[0022] When the above technical solution is adopted, the third indoor heat exchanger can heat the cooled and dehumidified air in the dehumidification mode, and can also heat the indoor air in the heating mode.
[0023] In the preferred technical solution of the above heat pump air conditioning system, the heat pump air conditioning system further comprises a second throttling device, the second throttling device is located between the first port of the third indoor heat exchanger and the branch point; and / or
[0024] The heat pump air conditioning system further includes a third throttling device, which is located between the second port of the third indoor heat exchanger and the second port of the outdoor heat exchanger.
[0025] When the above technical solution is adopted, by controlling the second throttling device and the third throttling device, it is possible to control whether the third indoor heat exchanger is used or not, and the refrigerant flow passing through the third indoor heat exchanger can also be adjusted.
[0026] In the preferred technical solution of the above heat pump air conditioning system, the heat pump air conditioning system further includes a fourth throttling device, and the fourth throttling device is located between the second port of the outdoor heat exchanger and the inlet of the ejector.
[0027] When the above technical solution is adopted, the refrigerant flowing to the ejector can be initially cooled and depressurized by the fourth throttling device, and the refrigerant flow to the ejector can also be adjusted.
[0028] In the preferred technical solution of the above heat pump air conditioning system, the heat pump air conditioning system further comprises a first valve body, wherein the first valve body is located between the fourth throttling device and the inlet of the ejector; and / or
[0029] The heat pump air conditioning system further includes a second valve body, which is located between the exhaust port of the gas-liquid separator and the fourth interface of the four-way valve.
[0030] When the above technical solution is adopted, the first valve body can prevent the refrigerant flowing through the second indoor heat exchanger in the heating mode from flowing to the ejector and the first indoor heat exchanger.
[0031] In the preferred technical solution of the above-mentioned heat pump air-conditioning system, the heat pump air-conditioning system also includes a branch pipeline and a third valve body, one end of the branch pipeline is connected to the pipeline between the fourth throttling device and the inlet of the ejector, and the other end is connected to the pipeline between the second port of the second indoor heat exchanger and the injection port, and the third valve body is located on the branch pipeline.
[0032] When the above technical solution is adopted, the third valve body can be controlled to prevent the refrigerant from backflowing into the second indoor heat exchanger in any working mode.
[0033] In the preferred technical solution of the above heat pump air conditioning system, the refrigerant used by the heat pump air conditioning system is CO2.
[0034] When the above technical solution is adopted, CO2 as a refrigerant will not cause harm to the environment and its heating performance is outstanding. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] The heat pump air conditioning system of the present application is described below with reference to the accompanying drawings. In the accompanying drawings:
[0036] Figure 1 A schematic diagram of a heat pump air conditioning system of the present application;
[0037] Figure 2 This is a schematic diagram of the operation of the heat pump air conditioning system in the dehumidification mode of the present application;
[0038] Figure 3 This is a schematic diagram of the operation of the heat pump air conditioning system in the cooling mode of the present application;
[0039] Figure 4 This is a schematic diagram of the operation of the heat pump air conditioning system in the heating mode of the present application.
[0040] Reference numerals list
[0041] 10. Compressor; 20. Four-way valve; 21. First interface; 22. Second interface; 23. Third interface; 24. Fourth interface; 30. Outdoor heat exchanger; 40. Ejector; 51. First indoor heat exchanger; 52. Second indoor heat exchanger; 53. Third indoor heat exchanger; 60. Gas-liquid separator; 71. First throttling device; 72. Second throttling device; 73. Third throttling device; 74. Fourth throttling device; 81. First valve body; 82. Second valve body; 90. Branch pipeline; 91. Third valve body. DETAILED DESCRIPTION
[0042] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. For example, although the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are arranged side by side and adjacent to each other along the air supply direction in the present embodiment, this positional relationship is not fixed, and those skilled in the art can adjust it as needed. For example, the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger can be arranged in sequence in the air supply duct.
[0043] It should be noted that in the description of the present application, the terms "upper", "lower", "inner", "outer", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0044] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0045] As described in the background technology, air conditioners, as a household appliance with a high frequency of use, play an important role in improving our living environment. For example, when the indoor humidity is high, the air conditioning system turns on the dehumidification mode, the surface temperature of the evaporator drops, and the water vapor in the air liquefies and condenses into water droplets, which are collected in the water tank. After the water in the water tank is filtered through the filter, it can be discharged to the outside through the drainage pipe, thereby achieving the purpose of indoor dehumidification. Generally speaking, within a certain temperature range, the lower the surface temperature of the evaporator, the better the dehumidification effect.
[0046] As a new generation of clean refrigerant, CO2 is non-toxic, harmless, and environmentally friendly, making it a very promising refrigerant. However, CO2's cooling performance is not as good as its heating performance, and even has certain shortcomings compared to traditional refrigerants. In addition, in order to ensure indoor comfort, the air conditioning system usually requires constant temperature dehumidification or even heating dehumidification, that is, the indoor air needs to be cooled and dehumidified before heating to maintain the indoor temperature. At this time, an additional heating device may need to be installed inside the air conditioner to heat the indoor air, which may reduce the overall energy efficiency of the air conditioning system.
[0047] In order to solve the problems of poor refrigeration capacity and low energy efficiency of existing air-conditioning systems, the present application provides a heat pump air-conditioning system, which includes a compressor, an outdoor heat exchanger, an ejector, a first indoor heat exchanger, a gas-liquid separator, a first throttling device, a second indoor heat exchanger and a third indoor heat exchanger, wherein the first port of the outdoor heat exchanger is connected to the exhaust port of the compressor; the inlet of the ejector is connected to the second port of the outdoor heat exchanger; the first port of the first indoor heat exchanger is connected to the outlet of the ejector; the inlet of the gas-liquid separator is connected to the second port of the first indoor heat exchanger, and the gas-liquid separator is connected to the second port of the first indoor heat exchanger. The exhaust port of the separator is connected to the suction port of the compressor; one end of the first throttling device is connected to the discharge port of the gas-liquid separator; the first port of the second indoor heat exchanger is connected to the other end of the first throttling device, and the second port of the second indoor heat exchanger is connected to the injection port of the ejector; the first port of the third indoor heat exchanger is connected to the exhaust port of the compressor, and the second port of the third indoor heat exchanger is connected to the second port of the outdoor heat exchanger; the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are arranged in the same air supply channel and the third indoor heat exchanger is located downstream of the second indoor heat exchanger.
[0048] In the case of adopting the above technical solution, when the air conditioning system is in dehumidification mode, the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are all in working state, and the indoor air cooled and dehumidified by the first indoor heat exchanger and the second indoor heat exchanger continues to be heated by the third indoor heat exchanger and then flows into the room again, which can achieve constant temperature dehumidification or even heating dehumidification without setting up an additional heating device, thus avoiding reducing the overall energy efficiency of the air conditioning system or the cooling capacity of the air conditioning. In cooling mode, the first indoor heat exchanger and the second indoor heat exchanger are in working state, and after the indoor air is cooled by the first indoor heat exchanger, the second indoor heat exchanger can further cool the indoor air, thus avoiding the reduction of cooling efficiency due to insufficient heat exchange of the refrigerant.
[0049] Refer to the following Figures 1 to 4 The heat pump air conditioning system of the present application is described. Figure 1 A schematic diagram of a heat pump air conditioning system of the present application; Figure 2 This is a schematic diagram of the operation of the heat pump air conditioning system in the dehumidification mode of the present application; Figure 3 This is a schematic diagram of the operation of the heat pump air conditioning system in the cooling mode of the present application; Figure 4 This is a schematic diagram of the operation of the heat pump air conditioning system in the heating mode of the present application.
[0050] like Figure 1As shown, in a preferred embodiment, the heat pump air conditioning system includes a compressor 10, a four-way valve 20, an outdoor heat exchanger 30, an ejector 40, a first indoor heat exchanger 51, a second indoor heat exchanger 52, a third indoor heat exchanger 53 and a gas-liquid separator 60. Among them, the first indoor heat exchanger 51, the second indoor heat exchanger 52 and the third indoor heat exchanger 53 are arranged side by side along the air supply direction, and the first indoor heat exchanger 51 is located upstream of the second indoor heat exchanger 52, and the third indoor heat exchanger 53 is located downstream of the second indoor heat exchanger 52. The first interface 21, the second interface 22, the third interface 23 and the fourth interface 24 of the four-way valve 20 are respectively connected to the exhaust port of the compressor 10, the first port of the outdoor heat exchanger 30, the air intake port of the compressor 10 and the exhaust port of the gas-liquid separator 60.
[0051] The third indoor heat exchanger 53 is arranged in parallel with the outdoor heat exchanger 30. A branch point is arranged between the exhaust port of the compressor 10 and the first interface 21 of the four-way valve 20. The first port ( Figure 1 The right side port of the third indoor heat exchanger 53 in the middle is connected to the branch point, and a second throttling device 72 is provided between the first port of the third indoor heat exchanger 53 and the branch point. Figure 1 A third throttling device 73 is provided between the left port of the third indoor heat exchanger 53 and the second port of the outdoor heat exchanger 30.
[0052] A fourth throttling device 74 and a first valve body 81 are provided between the second port of the outdoor heat exchanger 30 and the inlet of the ejector 40. The inlet of the ejector 40 is communicated with the second port of the outdoor heat exchanger 30 through the fourth throttling device 74 and the first valve body 81. The outlet of the ejector 40 is communicated with the first port of the first indoor heat exchanger 51. The second port of the first indoor heat exchanger 51 is communicated with the air inlet of the gas-liquid separator 60. The discharge port of the gas-liquid separator 60 is communicated with the first port of the second indoor heat exchanger 52 through the first throttling device 71. Figure 1 The exhaust port of the gas-liquid separator 60 is connected to the fourth interface 24 of the four-way valve 20 through the second valve body 82, and the second port ( Figure 1The left side port of the second indoor heat exchanger 52 in the outdoor heat exchanger 30 is connected to the injection port of the ejector 40 and one end of the branch pipeline 90 respectively. The branch pipeline 90 is provided with a third valve body 91, and the other end of the branch pipeline 90 is connected to the pipeline between the fourth throttling device 74 and the first valve body 81. Among them, one end of the third throttling device 73 is connected to the pipeline between the second port of the outdoor heat exchanger 30 and the fourth throttling device 74. One end of the third valve body 91 is connected to the second port of the second indoor heat exchanger 52, and the other end is connected to the fourth throttling device 74. Preferably, the first valve body 81 and the second valve body 82 are solenoid valves, and the third valve body 91 is a one-way valve.
[0053] In this embodiment, by controlling the state of each throttling device or solenoid valve, the switching of different working modes of the air conditioner can be controlled. For example, by controlling the opening and closing of the second throttling device 72 and the third throttling device 73, it is possible to control whether the refrigerant discharged from the compressor 10 flows to the third indoor heat exchanger 53, thereby controlling whether the indoor air is heated by the third indoor heat exchanger 53. Preferably, the first throttling device 71, the second throttling device 72, the third throttling device 73 and the fourth throttling device 74 are configured as electronic expansion valves.
[0054] The operating principle of the heat pump air conditioning system of the present application is described below in combination with different operating modes of the air conditioner.
[0055] like Figure 2As shown, in the dehumidification mode, the first interface 21 and the second interface 22 on the four-way valve 20 are connected, the third interface 23 and the fourth interface 24 are connected, the second throttling device 72 and the third throttling device 73 are both in the open state, the first throttling device 71 is opened to a certain opening, the fourth throttling device 74 is fully open, and the first valve body 81 and the second valve body 82 are both in the open state. The compressor 10 compresses the refrigerant into a high-temperature and high-pressure refrigerant gas, and then the refrigerant gas is divided into two paths. One path enters the outdoor heat exchanger 30 through the four-way valve 20 to be cooled and turned into a refrigerant gas at normal temperature and high pressure, and then enters the ejector 40 as a motive fluid after passing through the fourth throttling device 74. At the same time, the ejector 40 inhales the refrigerant gas generated by the heat exchange of the second indoor heat exchanger 52. The gas-liquid two-phase refrigerant is mixed and then ejected to the first indoor heat exchanger 51 through the ejector 40. The refrigerant absorbs indoor heat and vaporizes in the first indoor heat exchanger 51. Since the refrigerant heat exchange may be insufficient, the mixed refrigerant enters the gas-liquid separator 60. The separated gaseous refrigerant passes through the second valve body 82 and the four-way valve 20 and returns to the compressor 10. The separated liquid refrigerant enters the second indoor heat exchanger 52 after throttling and reducing the pressure of the first throttling device 71 to continue heat exchange. The refrigerant after heat exchange is inhaled by the ejector 40, and the cycle is repeated. Another refrigerant discharged from the compressor 10 enters the third indoor heat exchanger 53 through the second throttling device 72. After heating the cooled and dehumidified indoor air, the refrigerant flows from the third throttling device 73 to the fourth throttling device 74 and enters the refrigeration cycle.
[0056] In this embodiment, under the action of the ejector 40, the refrigerant flowing to the first indoor heat exchanger 51 is a mixed refrigerant, and the refrigerant flowing to the second indoor heat exchanger 52 is a liquid refrigerant, so the temperature in the first indoor heat exchanger 51 is higher than the temperature in the second indoor heat exchanger 52. The indoor air is first cooled by the first indoor heat exchanger 51 and then further cooled and dehumidified by the second indoor heat exchanger 52, which can improve the overall refrigeration efficiency and energy efficiency of the air conditioning system. The air after cooling and dehumidification is finally heated by the third indoor heat exchanger 53. By adjusting the opening of the second throttling device 72 and / or the third throttling device 73, the amount of refrigerant passing through the third indoor heat exchanger 53 can be adjusted, thereby adjusting the temperature in the third indoor heat exchanger 53, and then achieving the effect of constant temperature dehumidification or heating dehumidification.
[0057] like Figure 2 As shown, in the cooling mode, the second throttling device 72 and the third throttling device 73 are in a closed state, and the other settings are the same as in the dehumidification mode. The refrigerant does not pass through the third indoor heat exchanger 53, but directly enters the outdoor heat exchanger 30 through the four-way valve 20 and maintains the same flow direction as the refrigerant in the refrigeration cycle in the above-mentioned dehumidification mode.
[0058] like Figure 3As shown, in the heating mode, the first throttling device 71 and the second throttling device 72 are in a fully open state, the second valve body 82 is in an open state, the third throttling device 73 and the fourth throttling device 74 are opened to a certain opening, the first valve body 81 is in a closed state, the four-way valve 20 is reversed, the first interface 21 and the fourth interface 24 are connected, and the second interface 22 and the third interface 23 are connected. The compressor 10 compresses the refrigerant into a high-temperature and high-pressure refrigerant gas, and then the refrigerant gas is divided into two paths. One path enters the third indoor heat exchanger 53 through the second throttling device 72, and after completing the heating of the indoor air, enters the outdoor heat exchanger 30 for heat exchange through the throttling and pressure reduction of the third throttling device 73, and then returns to the compressor 10 through the four-way valve 20; the other path passes through the four-way valve 20 and the second valve body 82 and then enters the gas-liquid separator 60. At this time, the gas-liquid separator does not play a role in gas-liquid separation, and then the refrigerant enters the second indoor heat exchanger 52 through the first throttling device 71 to heat the indoor air. After the heat exchange is completed, the refrigerant passes through the third valve body 91, the throttling and pressure reduction of the fourth throttling device 74, the outdoor heat exchanger 30 and the four-way valve 20 in turn and then returns to the compressor 10.
[0059] In this embodiment, the refrigerant used in the heat pump air-conditioning system is CO2. As a new generation of clean refrigerant, CO2 is non-toxic and harmless, has good environmental performance, and has outstanding heating performance. However, its setting is not fixed, and technical personnel in this field can replace other refrigerants as needed.
[0060] It should be explained that, although in this embodiment, the first indoor heat exchanger 51, the second indoor heat exchanger 52 and the third indoor heat exchanger 53 are arranged side by side in sequence, their specific arrangement is not fixed. In an alternative embodiment, the second indoor heat exchanger 52 can be arranged upstream of the first indoor heat exchanger 51. However, considering the heat transfer and cooling efficiency, it is a better choice to arrange the first indoor heat exchanger 51 upstream of the second indoor heat exchanger 52. In another alternative embodiment, the first indoor heat exchanger 51, the second indoor heat exchanger 52 and the third indoor heat exchanger 53 may not be arranged side by side. For example, the first indoor heat exchanger 51, the second indoor heat exchanger 52 and the third indoor heat exchanger 53 are arranged in sequence in the air supply channel, and the indoor wind can also be cooled and dehumidified by the first indoor heat exchanger 51 and the second indoor heat exchanger 52 in sequence, and finally heated by the third indoor heat exchanger 53. However, considering the structural layout and installation, it is a better choice to arrange them side by side.
[0061] It is understood by those skilled in the art that, although in this embodiment, the branch point is located between the exhaust port of the compressor 10 and the first interface 21 of the four-way valve 20, its setting is not fixed, as long as the third indoor heat exchanger 53 is arranged in parallel with the outdoor heat exchanger 30. In an alternative embodiment, the branch point is located between the second interface 22 of the four-way valve 20 and the first port of the outdoor heat exchanger 30, and the outdoor heat exchanger 30 can only be used in the dehumidification mode. In addition, the settings of the first throttling device 71, the second throttling device 72, the third throttling device 73 and the fourth throttling device 74 are also not fixed. In an alternative embodiment, a three-way valve can be set on the exhaust pipeline of the compressor 10, which can also control whether the refrigerant discharged from the compressor 10 flows to the third indoor heat exchanger 53. At this time, the second throttling device 72 and the third throttling device 73 may not be set, or the second throttling device 72 and the third throttling device 73 are set as throttling capillaries, and accordingly, the first throttling device 71 and the fourth throttling device 74 may also be set as throttling capillaries. In another alternative embodiment, the fourth throttling device 74 may be omitted, for example, one end of the third throttling device 73 is connected to the second port of the outdoor heat exchanger 30, and the other end is respectively connected to the second port of the third indoor heat exchanger 53 and the first valve body 81. In addition, the specific configuration of the third valve body 91 is not fixed. In an alternative embodiment, the third valve body 91 may be replaced with a solenoid valve or other electrically controlled valves.
[0062] In addition, the setting of the four-way valve 20 is not fixed. In an alternative embodiment, the four-way valve 20 may not be set. In this case, two three-way valves may be set, one three-way valve is used to connect the exhaust port of the compressor 10, the second valve body 82 and the first port of the outdoor heat exchanger 30, and the other three-way valve is used to connect the air intake port of the compressor 10, the second valve body 82 and the first port of the outdoor heat exchanger 30. In addition, the first valve body 81 and the second valve body 82 may also be omitted, or the first valve body 81 and the second valve body 82 may be set as an electronic expansion valve, an electric butterfly valve, an electric ball valve or other electronically controlled valves, as long as they have a switch function. In addition, although in this embodiment, one end of the branch pipeline 90 is connected to the pipeline between the fourth throttling device 74 and the first valve body 81, its setting is not fixed. In an alternative embodiment, the branch pipeline 90 may not be set, and in this case, only the third indoor heat exchanger 53 is used for heating. In another alternative embodiment, one end of the branch pipe 90 is connected to the pipe between the second indoor heat exchanger 52 and the inlet of the ejector 40, and the other end is connected to the pipe between the third indoor heat exchanger 53 and the third throttling device 73. In this case, the third valve body 91 can also be omitted.
[0063] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.
[0064] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.
Claims
1. A heat pump air conditioning system, It is characterized in that include: compressor; an outdoor heat exchanger, wherein a first port of the outdoor heat exchanger is in communication with an exhaust port of the compressor; an ejector, wherein an inlet of the ejector is in communication with a second port of the outdoor heat exchanger; a first indoor heat exchanger, wherein a first port of the first indoor heat exchanger is in communication with an outlet of the ejector; a gas-liquid separator, wherein the inlet of the gas-liquid separator is communicated with the second port of the first indoor heat exchanger, and the exhaust port of the gas-liquid separator is communicated with the suction port of the compressor; a first throttling device, one end of which is in communication with a liquid discharge port of the gas-liquid separator; a second indoor heat exchanger, wherein a first port of the second indoor heat exchanger is connected to the other end of the first throttling device, and a second port of the second indoor heat exchanger is connected to the injection port of the ejector; a third indoor heat exchanger, wherein a first port of the third indoor heat exchanger is communicated with an exhaust port of the compressor, and a second port of the third indoor heat exchanger is communicated with a second port of the outdoor heat exchanger; The first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are arranged in the same air supply channel, and the third indoor heat exchanger is located downstream of the second indoor heat exchanger.
2. The heat pump air conditioning system according to claim 1, It is characterized in that The first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are arranged side by side along the air supply direction.
3. The heat pump air conditioning system according to claim 1, It is characterized in that The first indoor heat exchanger is located upstream of the second indoor heat exchanger.
4. The heat pump air conditioning system according to claim 1, It is characterized in that The heat pump air conditioning system also includes a four-way valve, the first interface, the second interface, the third interface and the fourth interface of the four-way valve are respectively connected to the exhaust port of the compressor, the first port of the outdoor heat exchanger, the air intake port of the compressor and the exhaust port of the gas-liquid separator.
5. The heat pump air conditioning system according to claim 4, It is characterized in that The third indoor heat exchanger is arranged in parallel with the outdoor heat exchanger, a branch point is arranged between the exhaust port of the compressor and the first interface of the four-way valve, and the first port of the third indoor heat exchanger is connected to the branch point.
6. The heat pump air conditioning system according to claim 5, It is characterized in that The heat pump air conditioning system further comprises a second throttling device, wherein the second throttling device is located between the first port of the third indoor heat exchanger and the branch point; and / or The heat pump air conditioning system further includes a third throttling device, which is located between the second port of the third indoor heat exchanger and the second port of the outdoor heat exchanger.
7. The heat pump air conditioning system according to claim 4, It is characterized in that The heat pump air conditioning system further includes a fourth throttling device, which is located between the second port of the outdoor heat exchanger and the inlet of the ejector.
8. The heat pump air conditioning system according to claim 7, It is characterized in that The heat pump air conditioning system further comprises a first valve body, wherein the first valve body is located between the fourth throttling device and the inlet of the ejector; and / or The heat pump air conditioning system further includes a second valve body, which is located between the exhaust port of the gas-liquid separator and the fourth interface of the four-way valve.
9. The heat pump air conditioning system according to claim 7, It is characterized in that The heat pump air conditioning system also includes a branch pipeline and a third valve body, one end of the branch pipeline is connected to the pipeline between the fourth throttling device and the inlet of the ejector, and the other end is connected to the pipeline between the second port of the second indoor heat exchanger and the injection port, and the third valve body is located on the branch pipeline.
10. The heat pump air conditioning system according to any one of claims 1 to 9, It is characterized in that The refrigerant used in the heat pump air conditioning system is CO2.