Air conditioning system

Abstract

The present disclosure provides an air conditioning system, belonging to the technical field of electrical equipment. The air conditioning system includes a first heating device, a first control valve, a second control valve, and a controller; the controller is configured to control the communication between port A and port B, control the communication between port C and port D, and control the communication between port E and port F when the air conditioning system is in the heating mode and the outdoor temperature is within a preset temperature range, so that the refrigerant first absorbs a part of the heat in the outdoor heat exchanger and then flows into the first heating device to absorb heat. By adopting the present disclosure, the first heating device shares a part of the heat exchange burden for the outdoor heat exchanger, reduces the heat exchange degree of the outdoor heat exchanger, delays the frosting duration of the outdoor heat exchanger, thereby reducing the frequency of reverse defrosting and increasing the heating efficiency of the air conditioning system in the heating mode.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electrical equipment, and particularly relates to an air conditioning system. Background Art

[0002] An air conditioning system generally includes a compressor, an indoor heat exchanger, a throttle valve, and an outdoor heat exchanger. The compressor, the indoor heat exchanger, the throttle valve, and the outdoor heat exchanger are connected in series to form a heat exchange loop. When the air conditioning system is in the heating mode, the refrigerant in the heat exchange loop absorbs heat from the external environment in the outdoor heat exchanger, and then circulates to the indoor heat exchanger to release heat to the indoor air, thereby achieving the heating function. However, when the air conditioning system is in a low-temperature working condition (i.e., the outdoor heat exchanger is located in a low-temperature environment), after operating for a period of time, the outdoor heat exchanger is very likely to frost, reducing the heat absorption efficiency of the refrigerant in the outdoor heat exchanger.

[0003] To solve the above frosting problem, when the air conditioning system is heating, it will occasionally perform reverse defrosting. During reverse defrosting, the refrigerant absorbs heat from the indoor environment in the indoor heat exchanger, and then circulates to the outdoor heat exchanger to release heat, thereby achieving defrosting.

[0004] However, in a low-temperature environment, the frosting speed of the outdoor heat exchanger is relatively fast. The air conditioning system needs to enter the reverse defrosting mode after working in the heating mode for a short period of time, reducing the heating effect of the air conditioning system in the heating mode. Summary of the Invention

[0005] Embodiments of the present disclosure provide an air conditioning system that can improve the heating effect of the air conditioning system in the heating mode. The technical solution is as follows:

[0006] Embodiments of the present disclosure provide an air conditioning system, characterized in that the air conditioning system includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a throttle valve, a first heating device, a first control valve, a second control valve, a temperature sensor, and a controller;

[0007] The first end of the throttle valve is connected to the first end of the indoor heat exchanger, and the second end of the throttle valve is connected to the first end of the outdoor heat exchanger;

[0008] The first end of the first heating device is connected to the second end of the outdoor heat exchanger;

[0009] The first control valve has ports A, B, C, and D. Port A is connected to the second end of the indoor heat exchanger, port B is connected to the outlet end of the compressor, and port D is connected to the inlet end of the compressor;

[0010] The second control valve has an E port, an F port, and a G port. The E port communicates with the C port, the F port communicates with the second end of the first heating device, and the G port communicates with the second end of the outdoor heat exchanger;

[0011] The temperature sensor is used to detect the outdoor temperature;

[0012] When the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range, the controller is used to control the A port to communicate with the B port, control the C port to communicate with the D port, and control the E port to communicate with the F port.

[0013] In a possible implementation manner, the controller is further used to control the opening degree of the throttle valve so that the superheat degree at the inlet end of the compressor is within the preset superheat degree range.

[0014] In a possible implementation manner, when the air conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range, the controller is further used to control the A port to communicate with the B port, control the C port to communicate with the D port, and control the E port to communicate with the G port.

[0015] In a possible implementation manner, when the air conditioning system is in the cooling mode, the controller is used to control the A port to communicate with the D port, control the B port to communicate with the C port, and control the E port to communicate with the G port.

[0016] In a possible implementation manner, the first heating device is an electric heating device.

[0017] In a possible implementation manner, the first heating device is a high-temperature regenerator. The first heating device has a first flow channel and a second flow channel. The first end of the first flow channel communicates with the B port, the second end of the first flow channel communicates with the outlet end of the compressor, the first end of the second flow channel is the first end of the first heating device, and the second end of the second flow channel is the second end of the first heating device.

[0018] In a possible implementation manner, the air conditioning system further includes a second heating device. The first end of the second heating device communicates with the second end of the outdoor heat exchanger and the G port, and the second end of the second heating device communicates with the first end of the first heating device.

[0019] In a possible implementation manner, the second heating device is an electric heating device.

[0020] In a possible implementation, the second heating device is a low-temperature recuperator. The second heating device has a third flow channel and a fourth flow channel. The first end of the third flow channel communicates with the first end of the indoor heat exchanger, the second end of the third flow channel communicates with the first end of the throttle valve, the first end of the fourth flow channel is the first end of the second heating device, and the second end of the fourth flow channel is the second end of the second heating device.

[0021] In a possible implementation, the air-conditioning system further includes a third heating device. The first end of the third heating device communicates with the second end of the outdoor heat exchanger, and the second end of the third heating device communicates with the first end of the first heating device and the G port.

[0022] In a possible implementation, the third heating device is an electric heating device.

[0023] In a possible implementation, the air-conditioning system further includes a heat exchange device. The heat exchange device has a fifth flow channel and a sixth flow channel. The first end of the fifth flow channel communicates with the first end of the indoor heat exchanger, the second end of the fifth flow channel communicates with the first end of the throttle valve, the first end of the sixth flow channel communicates with the second end of the outdoor heat exchanger, and the second end of the sixth flow channel communicates with the first end of the first heating device and the G port.

[0024] The technical solutions provided by the embodiments of the present disclosure at least include the following beneficial effects:

[0025] The embodiments of the present disclosure provide an air-conditioning system. When the air-conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range, it indicates that the outdoor heat exchanger is in a low-temperature and easy-to-frost environment at this time. At this time, the controller can control the A port and the B port of the first control valve to communicate, and the C port and the D port to communicate, and control the E port and the F port of the second control valve to communicate, so that the low-temperature and low-pressure refrigerant can first absorb a part of the heat in the outdoor heat exchanger and then flow into the first heating device to absorb a part of the heat. In this way, the first heating device can share a part of the heat exchange burden of the outdoor heat exchanger, reduce the heat exchange degree of the outdoor heat exchanger, thereby delaying the frosting duration of the outdoor heat exchanger, and further reducing the frequency of reverse defrosting, increasing the heating efficiency of the air-conditioning system in the heating mode.

[0026] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. Description of the Drawings

[0027] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 is a schematic structural diagram of an air conditioning system shown in an embodiment of the present disclosure;

[0029] Figure 2 is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range shown in an embodiment of the present disclosure;

[0030] Figure 3 is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range shown in an embodiment of the present disclosure;

[0031] Figure 4 is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the cooling mode shown in an embodiment of the present disclosure;

[0032] Figure 5 is a schematic structural diagram of an air conditioning system shown in an embodiment of the present disclosure;

[0033] Figure 6 is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range shown in an embodiment of the present disclosure;

[0034] Figure 7 is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range shown in an embodiment of the present disclosure;

[0035] Figure 8 is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the cooling mode shown in an embodiment of the present disclosure;

[0036] Figure 9 is a schematic structural diagram of an air conditioning system shown in an embodiment of the present disclosure;

[0037] Figure 10 is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range shown in an embodiment of the present disclosure;

[0038] Figure 11It is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range shown in the embodiments of the present disclosure;

[0039] Figure 12 It is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the cooling mode shown in the embodiments of the present disclosure;

[0040] Figure 13 It is a schematic diagram of the structure of an air conditioning system shown in the embodiments of the present disclosure;

[0041] Figure 14 It is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range shown in the embodiments of the present disclosure;

[0042] Figure 15 It is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range shown in the embodiments of the present disclosure;

[0043] Figure 16 It is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the cooling mode shown in the embodiments of the present disclosure;

[0044] Figure 17 It is a schematic diagram of the structure of an air conditioning system shown in the embodiments of the present disclosure;

[0045] Figure 18 It is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range shown in the embodiments of the present disclosure;

[0046] Figure 19 It is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range shown in the embodiments of the present disclosure;

[0047] Figure 20 It is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the cooling mode shown in the embodiments of the present disclosure;

[0048] Figure 21 It is a schematic diagram of the structure of an air conditioning system shown in the embodiments of the present disclosure;

[0049] Figure 22 It is a schematic diagram of the working state of an air conditioning system when the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range shown in the embodiments of the present disclosure;

[0050] Figure 23It is a schematic diagram of the working state of an air-conditioning system when the air-conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range shown in an embodiment of the present disclosure;

[0051] Figure 24 It is a schematic diagram of the working state of an air-conditioning system when the air-conditioning system is in the cooling mode shown in an embodiment of the present disclosure;

[0052] Figure 25 It is a schematic diagram of the experimental effect of an air-conditioning system shown in an embodiment of the present disclosure.

[0053] Legend Explanation

[0054] 1. Compressor; 2. Indoor heat exchanger; 3. Outdoor heat exchanger; 4. Throttle valve; 5. First heating device; 6. First control valve; 7. Second control valve; 8. Second heating device; 9. Third heating device; 10. Heat exchange device;

[0055] 11. Outlet end of the compressor; 12. Inlet end of the compressor;

[0056] 21. First end of the indoor heat exchanger; 22. Second end of the indoor heat exchanger;

[0057] 31. First end of the outdoor heat exchanger; 32. Second end of the outdoor heat exchanger;

[0058] 41. First end of the throttle valve; 42. Second end of the throttle valve;

[0059] 51. First end of the first heating device; 52. Second end of the first heating device; 53. First flow channel; 54. Second flow channel;

[0060] 531. First end of the first flow channel; 532. Second end of the first flow channel;

[0061] A. A port; B. B port; C. C port; D. D port;

[0062] E. E port; F. F port; G. G port;

[0063] 81. First end of the second heating device; 82. Second end of the second heating device; 83. Third flow channel; 84. Fourth flow channel;

[0064] 831. First end of the third flow channel; 832. Second end of the third flow channel;

[0065] 91. First end of the third heating device; 92. Second end of the third heating device;

[0066] 101. Fifth flow channel; 102. Sixth flow channel;

[0067] 1011, the first end of the fifth flow channel; 1012, the second end of the fifth flow channel; 1021, the first end of the sixth flow channel; 1022, the second end of the sixth flow channel. Detailed implementation manners

[0068] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0069] The embodiments of the present disclosure provide an air conditioning system, as Figure 1 shown. The air conditioning system includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, a throttle valve 4, a first heating device 5, a first control valve 6, a second control valve 7, a temperature sensor, and a controller.

[0070] Among them, the compressor 1 has a connected inlet end and outlet end. The indoor heat exchanger 2 has a first end 21 and a second end 22 of the indoor heat exchanger 2 that are connected. The outdoor heat exchanger 3 has a first end 31 and a second end 32 of the outdoor heat exchanger 3 that are connected. The throttle valve 4 has a first end 41 and a second end 42 of the throttle valve 4 that are connected. The first heating device 5 has a first end 51 and a second end 52 of the first heating device 5 that are connected. The first control valve 6 has a port A, a port B, a port C, and a port D. The port A, the port B, the port C, and the port D can achieve communication between any two of them. The second control valve 7 has a port E, a port F, and a port G. The port E, the port F, and the port G can achieve communication between any two ports.

[0071] The first end 41 of the throttle valve 4 is connected to the first end 21 of the indoor heat exchanger 2, and the second end 42 of the throttle valve 4 is connected to the first end 31 of the outdoor heat exchanger 3. The first end 51 of the first heating device 5 is connected to the second end 32 of the outdoor heat exchanger 3. The port A of the first control valve 6 is connected to the second end 22 of the indoor heat exchanger 2, the port B of the first control valve 6 is connected to the outlet end 11 of the compressor 1, and the port D of the first control 6 is connected to the inlet end 12 of the compressor 1. The port E of the second control valve 7 is connected to the port C of the first control valve 6, the port F of the second control valve 7 is connected to the second end 52 of the first heating device 5, and the port G of the second control valve 7 is connected to the second end 32 of the outdoor heat exchanger 3.

[0072] The temperature sensor is located outdoors and can be fixed at any position capable of detecting the outdoor temperature. For example, it can be fixed at the same position as the outdoor heat exchanger 3, or fixed on the outdoor heat exchanger 3, etc. The embodiments of the present disclosure do not specifically limit the fixing position of the temperature sensor.

[0073] The controller can be electrically connected to the compressor 1, the indoor heat exchanger 2, the outdoor heat exchanger 3, the throttle valve 4, the first heating device 5, the first control valve 6, the second control valve 7, and the temperature sensor respectively.

[0074] The temperature sensor can periodically detect the outdoor temperature and then send the detected outdoor temperature to the controller.

[0075] The controller prestores a preset temperature range, which is the outdoor temperature at which the outdoor heat exchanger 3 is prone to frosting and can be set according to the actual situation. For example, the preset temperature range can be -7 degrees Celsius to 5 degrees Celsius, etc. The embodiments of the present disclosure do not make specific limitations on this.

[0076] In implementation, when the air-conditioning system enters the heating mode, the controller first determines whether the outdoor temperature received from the temperature sensor is within the preset temperature range.

[0077] If the outdoor temperature is within the preset temperature range, it means that the outdoor heat exchanger 3 is operating in a low-temperature environment prone to frosting at this time. At this time, as Figure 2 shown, the controller can control the first control valve 6 to connect the A port to the B port ( Figure 2 has been shown by a connecting line in Figure 2 ), connect the C port to the D port ( Figure 2 has been shown by a connecting line in

[0078] ), and control the second control valve 7 to connect the E port to the F port ( Figure 2 the two triangular figures filled with black in

[0079] Figure 2 are the two connected ports).

[0078] As Figure 2 shown, at this time, the working state of the air-conditioning system is: the outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the indoor heat exchanger 2 through the B port, the A port, and the second end 22 of the indoor heat exchanger 2 to release heat, thereby heating the room. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant enters the throttle valve 4 through the first end 21 of the indoor heat exchanger 2 and the first end 41 of the throttle valve 4 to reduce the pressure. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the outdoor heat exchanger 3 through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 to absorb heat. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant enters the first heating device 5 through the second end 32 of the outdoor heat exchanger 3 and the first end 51 of the first heating device 5 for further heating. The heated refrigerant enters the compressor 1 through the second end 52 of the first heating device 5, the F port, the E port, the C port, the D port, and the inlet end 12 of the compressor 1 for compression, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0079] In the above process, the controller controls the first control valve 6 and the second control valve 7, thereby realizing the heating mode of the air conditioning system, and connecting the first heating device 5 between the second end 32 of the outdoor heat exchanger 3 and the inlet end 12 of the compressor 1, so that the first heating device 5 can share part of the heat exchange burden of the outdoor heat exchanger 3, reduce the heat exchange degree of the outdoor heat exchanger 3, thereby delaying the frosting duration of the outdoor heat exchanger 3, and further reducing the frequency of reverse defrosting, increasing the heating efficiency of the air conditioning system in the heating mode, and improving the comprehensive energy efficiency COP (Coefficient Of Performance).

[0080] In a possible implementation manner, the controller is further configured to control the connection between port A and port B, control the connection between port C and port D, and control the connection between port E and port G when the air conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range.

[0081] In implementation, when the air conditioning system enters the heating mode, the controller first determines whether the outdoor temperature sent by the received temperature sensor is within the preset temperature range.

[0082] If the outdoor temperature is outside the preset temperature range, it means that although the outdoor heat exchanger 3 is in an environment with a relatively low temperature at this time, the outdoor heat exchanger 3 is not easily frosted in this environment. Therefore, at this time, as Figure 3 shown, the controller can control the first control valve 6 to connect port A and port B ( Figure 3 shown by the connecting line in Figure 3 ), connect port C and port D ( Figure 3 shown by the connecting line in

[0083] ), and control the second control valve 7 to connect port E and port G ( Figure 3 the two triangular figures filled with black in Figure 3 are the two connected ports).As shown, at this time, the operating state of the air-conditioning system is as follows: The outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the indoor heat exchanger 2 through port B, port A, and the second end 22 of the indoor heat exchanger 2 to release heat, thereby heating the room. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant enters the throttle valve 4 through the first end 21 of the indoor heat exchanger 2 and the first end 41 of the throttle valve 4 to reduce the pressure. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the outdoor heat exchanger 3 through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 to absorb heat. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant enters the compressor 1 through the second end 32 of the outdoor heat exchanger 3, port G, port E, port C, port D, and the inlet end 12 of the compressor 1 for compression, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0084] In the above process, the controller controls the first control valve 6 and the second control valve 7 to realize the heating mode of the air-conditioning system. And, since the outdoor heat exchanger 3 is not prone to frosting at this time, and the refrigerant can absorb enough heat in the outdoor heat exchanger 3, there is no need for the first heating device 5 to share the heat exchange burden of the outdoor heat exchanger 3. At this time, by controlling the second control valve 7 to connect port E and port G, the first heating device 5 is bypassed, so that the refrigerant does not need to enter the first heating device 5 for further heating, improving the energy efficiency of the air-conditioning system.

[0085] In a possible implementation manner, the controller is further configured to control the opening degree of the throttle valve 4 so that the superheat degree at the inlet end 12 of the compressor 1 is within a preset superheat degree range.

[0086] Wherein, the superheat degree at the inlet end 12 of the compressor 1 can be the first temperature value at the inlet end 12 of the compressor 1 and the second temperature value at the refrigerant inlet of the outdoor heat exchanger 3.

[0087] In implementation, temperature sensors can be respectively arranged at the inlet end 12 of the compressor 1 and the refrigerant inlet of the outdoor heat exchanger 3. The temperature sensors at the corresponding positions send the detected temperatures to the controller, and the controller determines the superheat degree at the inlet end 12 of the compressor 1 based on the temperature difference between the obtained first temperature value and the second temperature value.

[0088] If the superheat degree is within the preset superheat degree range, it indicates that the working efficiency of each part is normal at this time. If the superheat degree is outside the preset superheat degree range, the working efficiency of each part is abnormal at this time, and it may occur that the indoor heat exchanger 2 cannot provide sufficient heat. Therefore, at this time, the controller can gradually adjust the opening degree of the throttle valve 4 until the superheat degree detected at the inlet end 12 of the compressor 1 is within the preset superheat degree range, so as to improve the energy efficiency of the air conditioning system.

[0089] Among them, the preset superheat degree range can be set according to requirements. For example, in the embodiments of the present disclosure, the preset superheat degree range can be 2 degrees Celsius to 3 degrees Celsius, and so on. The embodiments of the present disclosure do not make specific limitations in this regard.

[0090] In a possible implementation manner, the controller is further configured to control the communication between port A and port D, control the communication between port B and port C, and control the communication between port E and port G when the air conditioning system is in the cooling mode.

[0091] During implementation, as Figure 4 shown, at this time, the working state of the air conditioning system is as follows: the outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the outdoor heat exchanger 3 through port B, port C, port E, port G, and the second end 32 of the outdoor heat exchanger 3 to release heat. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant enters the throttle valve 4 through the first end 31 of the outdoor heat exchanger 3 and the second end 42 of the throttle valve 4 to reduce pressure. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the indoor heat exchanger 2 through the first end 41 of the throttle valve 4 and the first end 21 of the indoor heat exchanger 2 to absorb heat, thereby cooling the indoor space. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant enters the compressor through the second end 22 of the indoor heat exchanger 2, port A, port D, and the inlet end 12 of the compressor 1 to be compressed, so as to obtain high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0092] In the above process, the controller realizes the cooling mode of the air conditioning system by controlling the first control valve 6 and the second control valve 7. And since the air conditioning system is in the cooling mode at this time, there is no need for the first heating device 5 to further heat the high-temperature and high-pressure refrigerant flowing out from the outlet end 11 of the compressor 1. Therefore, by controlling the second control valve 7 to connect port E and port G, the first heating device 5 is bypassed, so that the refrigerant does not need to enter the first heating device 5 anymore.

[0093] In a possible implementation, the first heating device 5 in the embodiments of the present disclosure may be an electric heating device. In this way, the heating efficiency of the first heating device 5 can be improved, and further the heating efficiency of the air conditioning system can be improved.

[0094] When the first heating device 5 is an electric heating device, the working state of the air conditioning system is the same as that described above, and will not be elaborated here.

[0095] In another possible implementation, the first heating device 5 in the embodiments of the present disclosure may be a high-temperature recuperator. As Figure 5 shown, the first heating device 5 has a first flow channel 53 and a second flow channel 54 that exchange heat with each other.

[0096] The first end 531 of the first flow channel 53 is communicated with the B port, the second end 532 of the first flow channel 53 is communicated with the outlet end 11 of the compressor 1, the first end of the second flow channel 54 is the first end 51 of the first heating device 5, that is, the first end of the second flow channel 54 is communicated with the second end 32 of the outdoor heat exchanger 3, and the second end of the second flow channel 54 is the second end 52 of the first heating device 5, that is, the second end of the second flow channel 54 is communicated with the F port.

[0097] When the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range, as Figure 6 shown, the working state of the air conditioning system is as follows: the outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the first flow channel 53 through the second end 532 of the first flow channel 53 to release heat. The refrigerant after heat release passes through the first end 531 of the first flow channel 53, the B port, the A port, and the second end 22 of the indoor heat exchanger 2 and enters the indoor heat exchanger 2 to release heat, thereby heating the room. The refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant passes through the first end 21 of the indoor heat exchanger 2 and the first end 41 of the throttle valve 4 and enters the throttle valve 4 to be depressurized. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant passes through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 and enters the outdoor heat exchanger 3 to absorb heat. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant passes through the second end 32 of the outdoor heat exchanger 3 and the first end of the second flow channel 54 and enters the second flow channel 54 to further absorb the heat released by the first flow channel 53. The refrigerant after heat absorption passes through the second end of the second flow channel 54, the F port, the E port, the C port, the D port, and the inlet end 12 of the compressor 1 and enters the compressor 1 to be compressed, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0098] In the above process, the controller controls the first control valve 6 and the second control valve 7, thereby realizing the heating mode of the air-conditioning system. Moreover, the first heating device 5 shares a part of the heat exchange burden of the outdoor heat exchanger 3, reduces the heat exchange degree of the outdoor heat exchanger 3, thereby delaying the frosting duration of the outdoor heat exchanger 3, and further reducing the frequency of reverse defrosting, and increasing the heating efficiency of the air-conditioning system in the heating mode.

[0099] Moreover, although the high-temperature and high-pressure refrigerant flowing out of the outlet end 11 of the compressor 1 releases heat first in the first flow channel 53, the controller can control the superheat degree at the inlet end 12 of the compressor 1 to be within the preset superheat degree range by adjusting the opening degree of the throttle valve 4, and can increase the flow rate of the high-temperature and high-pressure refrigerant flowing out of the outlet end 11 of the compressor 1. Even if this part of the refrigerant with a large flow rate releases a part of the heat first in the first flow channel 53, the heat released when entering the indoor heat exchanger 2 is sufficient to realize heating of the room. That is, the first heating device 5 will not affect the normal operation of the indoor heating mode, and the indoor heating mode can operate with normal working efficiency.

[0100] When the air-conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range, as Figure 7 shown, the working state of the air-conditioning system is: the outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant passes through the first flow channel 53, port B, port A, and the second end 22 of the indoor heat exchanger 2 to enter the indoor heat exchanger 2 for heat release, thereby heating the room. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant passes through the first end 21 of the indoor heat exchanger 2 and the first end 41 of the throttle valve 4 to enter the throttle valve 4 for pressure reduction. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant passes through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 to enter the outdoor heat exchanger 3 for heat absorption. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant passes through the second end 32 of the outdoor heat exchanger 3, port G, port E, port C, port D, and the inlet end 12 of the compressor 1 to enter the compressor 1 for compression, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thereby realizing circulation.

[0101] In the above process, since the outdoor heat exchanger 3 is not easily frosted and the refrigerant can absorb enough heat in the outdoor heat exchanger 3, there is no need for the first heating device 5 to share the heat exchange burden of the outdoor heat exchanger 3. At this time, by controlling the second control valve 7 to connect port E and port G, the second flow channel 54 of the first heating device 5 is bypassed, so that the refrigerant does not need to enter the second flow channel 54 for further heat absorption, improving the energy efficiency of the air-conditioning system.

[0102] It can be understood that since the refrigerant no longer flows into the second flow channel 54 for heat exchange, the high-temperature and high-pressure refrigerant flowing through the first flow channel 53 will no longer release heat in the first flow channel 53, but directly flow into the indoor heat exchanger 2 for heat release.

[0103] When the air-conditioning system is in the cooling mode, as Figure 8 shown, the working state of the air-conditioning system is as follows: The outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant passes through the first flow channel 53, port B, port C, port E, port G, and the second end 32 of the outdoor heat exchanger 3 and enters the outdoor heat exchanger 3 for heat release. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant passes through the first end 31 of the outdoor heat exchanger 3 and the second end 42 of the throttle valve 4 and enters the throttle valve 4 for pressure reduction. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant passes through the first end 41 of the throttle valve 4 and the first end 21 of the indoor heat exchanger 2 and enters the indoor heat exchanger 2 for heat absorption, thereby cooling the room. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant passes through the second end 22 of the indoor heat exchanger 2, port A, port D, and the inlet end 12 of the compressor 1 and enters the compressor for compression, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0104] In the above process, since the air-conditioning system is in the cooling mode and there is no need for the first heating device 5 to further heat the high-temperature and high-pressure refrigerant flowing out from the outlet end 11 of the compressor 1, the second control valve 7 is controlled to connect the E port and the G port, thereby bypassing the second flow channel 54 of the first heating device 5, so that the refrigerant no longer needs to enter the second flow channel 54.

[0105] It can be understood that since the refrigerant no longer flows into the second flow channel 54 for heat exchange, the high-temperature and high-pressure refrigerant flowing through the first flow channel 53 will no longer release heat in the first flow channel 53.

[0106] The embodiment of the present disclosure provides an air-conditioning system. When the air-conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range, it indicates that the outdoor heat exchanger 3 is in a low-temperature and easy-to-frost environment at this time. At this time, the controller can control the A port and the B port of the first control valve 6 to be connected, and the C port and the D port to be connected, and control the E port and the F port of the second control valve 7 to be connected, so that the low-temperature and low-pressure refrigerant can first absorb a part of the heat in the outdoor heat exchanger 3 and then flow into the first heating device 5 to absorb a part of the heat. In this way, the first heating device 5 can share a part of the heat exchange burden of the outdoor heat exchanger 3, reduce the heat exchange degree of the outdoor heat exchanger 3, thereby delaying the frosting time of the outdoor heat exchanger 3, and further reducing the frequency of reverse defrosting, and increasing the heating efficiency of the air-conditioning system in the heating mode.

[0107] In an embodiment of the present disclosure, the air conditioning system may further include a second heating device 8, such as Figure 9 shown, the first end 81 of the second heating device 8 is communicated with the second end 32 and the G port of the outdoor heat exchanger 3, and the second end 82 of the second heating device 8 is communicated with the first end 51 of the first heating device 5.

[0108] When the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range, such as Figure 10 described, the working state of the air conditioning system is: the outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant enters the indoor heat exchanger 2 through the B port, the A port, and the second end 22 of the indoor heat exchanger 2 to release heat, thereby heating the indoor environment. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant, and the low-temperature and high-pressure refrigerant enters the throttle valve 4 through the first end 21 of the indoor heat exchanger 2 and the first end 41 of the throttle valve 4 to be depressurized. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant, and the low-temperature and low-pressure refrigerant enters the outdoor heat exchanger 3 through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 to absorb heat. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant, and the high-temperature and low-pressure refrigerant enters the second heating device 8 through the second end 32 of the outdoor heat exchanger 3 and the first end 81 of the second heating device 8 for secondary heat absorption. After the secondary heat absorption, the refrigerant enters the first heating device 5 through the second end 82 of the second heating device 8 and the first end 51 of the first heating device 5 for tertiary heat absorption. After the tertiary heat absorption, the refrigerant enters the compressor 1 through the second end 52 of the first heating device 5, the F port, the E port, the C port, the D port, and the inlet end 12 of the compressor 1 for compression, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0109] In the above process, the controller controls the first control valve 6 and the second control valve 7, thereby realizing the heating mode of the air conditioning system, and connecting both the second heating device 8 and the first heating device 5 between the second end 32 of the outdoor heat exchanger 3 and the inlet end 12 of the compressor 1, so that the second heating device 8 and the first heating device 5 can share a part of the heat exchange burden of the outdoor heat exchanger 3, further reducing the heat exchange degree of the outdoor heat exchanger 3, thereby delaying the frosting duration of the outdoor heat exchanger 3, and further reducing the frequency of reverse defrosting, increasing the heating efficiency of the air conditioning system in the heating mode.

[0110] When the air conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range, such as Figure 11As described above, the operating state of the air-conditioning system is as follows: The outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the indoor heat exchanger 2 through port B, port A, and the second end 22 of the indoor heat exchanger 2 to release heat, thereby heating the indoor space. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant enters the throttle valve 4 through the first end 21 of the indoor heat exchanger 2 and the first end 41 of the throttle valve 4 to reduce the pressure. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the outdoor heat exchanger 3 through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 to absorb heat. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant enters the compressor 1 through the second end 32 of the outdoor heat exchanger 3, port G, port E, port C, port D, and the inlet end 12 of the compressor 1 for compression, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0111] In the above process, the controller realizes the heating mode of the air-conditioning system by controlling the first control valve 6 and the second control valve 7. And, since the outdoor heat exchanger 3 is not prone to frosting at this time, and the refrigerant can absorb sufficient heat in the outdoor heat exchanger 3, there is no need for the first heating device 5 and the second heating device 8 to share the heat exchange burden of the outdoor heat exchanger 3. At this time, by controlling the second control valve 7 to connect port E and port G, the first heating device 5 and the second heating device 8 are both bypassed, so that the refrigerant does not need to enter the first heating device 5 and the second heating device 8 for further heating, improving the energy efficiency of the air-conditioning system.

[0112] When the air-conditioning system is in the cooling mode, as Figure 12 shown, the operating state of the air-conditioning system is as follows: The outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the outdoor heat exchanger 3 through port B, port C, port E, port G, and the second end 32 of the outdoor heat exchanger 3 to release heat. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant enters the throttle valve 4 through the first end 31 of the outdoor heat exchanger 3 and the second end 42 of the throttle valve 4 to reduce the pressure. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the indoor heat exchanger 2 through the first end 41 of the throttle valve 4 and the first end 21 of the indoor heat exchanger 2 to absorb heat, thereby cooling the indoor space. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant enters the compressor through the second end 22 of the indoor heat exchanger 2, port A, port D, and the inlet end 12 of the compressor 1 for compression, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0113] In the above process, the controller controls the first control valve 6 and the second control valve 7, thereby realizing the refrigeration mode of the air-conditioning system. Moreover, since the air-conditioning system is in the refrigeration mode at this time, there is no need for the first heating device 5 and the second heating device 8 to further heat the high-temperature and high-pressure refrigerant flowing out of the outlet end 11 of the compressor 1. Therefore, by controlling the second control valve 7 to connect the E port and the G port, the first heating device 5 and the second heating device 8 are both bypassed, so that the refrigerant does not need to enter the first heating device 5 and the second heating device 8 anymore.

[0114] In a possible implementation manner, the second heating device 8 in the embodiments of the present disclosure may be an electric heating device. In this way, the heating efficiency of the second heating device 8 can be improved, and further the heating efficiency of the air-conditioning system can be improved.

[0115] When the second heating device 8 is an electric heating device, the working state of the air-conditioning system is the same as that introduced above, and will not be elaborated here.

[0116] In the air-conditioning system provided by the embodiments of the present disclosure, the first heating device 5 and the second heating device 8 may both be electric heating devices, or the first heating device 5 may be a high-temperature recuperator and the second heating device 8 may be an electric heating device, etc. It can be set according to actual needs, and the embodiments of the present disclosure do not make specific limitations thereto.

[0117] In another possible implementation manner, the second heating device 8 in the embodiments of the present disclosure may be a low-temperature recuperator. In the air-conditioning system provided by the embodiments of the present disclosure, the first heating device 5 and the second heating device 8 may both be recuperators, that is, the first heating device 5 is a high-temperature recuperator and the second heating device 8 is a low-temperature recuperator, or the first heating device 5 is an electric heating device and the second heating device 8 is a low-temperature recuperator, etc. It can be set according to actual needs, and the embodiments of the present disclosure do not make specific limitations thereto.

[0118] As Figure 13 shown, Figure 13 In the air-conditioning system shown, the first heating device 5 is a high-temperature recuperator and the second heating device 8 is a low-temperature recuperator. Taking this as an example, the air-conditioning system when the second heating device 8 is a low-temperature recuperator will be introduced.

[0119] The second heating device 8 has a third flow channel 83 and a fourth flow channel 84 that exchange heat with each other.

[0120] The first end 831 of the third flow channel 83 communicates with the first end 21 of the indoor heat exchanger 2, and the second end 832 of the third flow channel 83 communicates with the first end 41 of the throttle valve 4. The first end of the fourth flow channel 84 is the first end 81 of the second heating device 8, that is, the first end of the fourth flow channel 84 communicates with the second end 32 of the outdoor heat exchanger 3. The second end of the fourth flow channel 84 is the second end 82 of the second heating device 8, that is, the second end of the fourth flow channel 84 communicates with the first end 51 (the first end of the second flow channel 54) of the first heating device 5.

[0121] When the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range, as Figure 14 shown, the working state of the air conditioning system is as follows: The outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the first flow channel 53 through the second end 532 of the first flow channel 53 and releases heat in the first flow channel 53. After releasing heat, the refrigerant passes through the first end 531 of the first flow channel 53, port B, port A, and the second end 22 of the indoor heat exchanger 2 and enters the indoor heat exchanger 2 to release heat, thereby heating the indoor space. The refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant passes through the first end 21 of the indoor heat exchanger 2 and the first end 831 of the third flow channel 83 and enters the third flow channel 83 to release heat again. After releasing heat, the refrigerant passes through the second end 832 of the third flow channel 83 and the first end 41 of the throttle valve 4 and enters the throttle valve 4 to reduce pressure and becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant passes through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 and enters the outdoor heat exchanger 3 to absorb heat for the first time. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant passes through the second end 32 of the outdoor heat exchanger 3 and the first end of the fourth flow channel 84 and enters the fourth flow channel 84 to absorb heat for the second time, that is, to absorb the heat released by the third flow channel 83. After absorbing heat for the second time, the refrigerant passes through the second end of the fourth flow channel 84 and the first end of the second flow channel 54 and enters the second flow channel 54 to absorb heat for the third time, that is, to absorb the heat released by the first flow channel 53. After absorbing heat, the refrigerant passes through the second end of the second flow channel 54, port F, port E, port C, port D, and the inlet end 12 of the compressor 1 and enters the compressor 1 to be compressed, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0122] In the above process, after the refrigerant absorbs heat in the outdoor heat exchanger 3, it also undergoes low-temperature heat exchange in the second heating device 8 and high-temperature heat exchange in the first heating device 5. In this way, both the first heating device 5 and the second heating device 8 share a large part of the heat exchange burden for the outdoor heat exchanger 3, greatly reducing the heat exchange degree of the outdoor heat exchanger 3, thereby delaying the frosting duration of the outdoor heat exchanger 3, reducing the frequency of reverse defrosting, and increasing the heating efficiency of the air conditioning system in the heating mode.

[0123] Moreover, although the refrigerant releases heat in the first flow channel 53 and the third flow channel 83, the controller can control the superheat degree at the inlet end 12 of the compressor 1 to be within a preset superheat degree range by adjusting the opening degree of the throttle valve 4, and can increase the flow rate of the high-temperature and high-pressure refrigerant flowing out from the outlet end 11 of the compressor 1. In this way, it is ensured that the refrigerant can release heat in the first flow channel 53, the indoor heat exchanger 2, and the third flow channel 83, and the first heating device 5, the indoor heat exchanger 2, and the second heating device 8 can all work with normal working efficiency.

[0124] When the air-conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range, such as Figure 15 shown, the working state of the air-conditioning system is as follows: The outlet end 11 of the compressor 1 outputs a high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the indoor heat exchanger 2 through the first flow channel 53, the B port, the A port, and the second end 22 of the indoor heat exchanger 2 to release heat, thereby heating the room. The high-temperature and high-pressure refrigerant becomes a low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant enters the throttle valve 4 through the first end 21 of the indoor heat exchanger 2, the third flow channel 83, and the first end 41 of the throttle valve 4 to reduce the pressure. The low-temperature and high-pressure refrigerant becomes a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the outdoor heat exchanger 3 through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 to absorb heat. The low-temperature and low-pressure refrigerant becomes a high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant enters the compressor 1 through the second end 32 of the outdoor heat exchanger 3, the G port, the E port, the C port, the D port, and the inlet end 12 of the compressor 1 to be compressed, thereby obtaining a high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0125] In the above process, since the outdoor heat exchanger 3 is not prone to frosting and the refrigerant can absorb enough heat in the outdoor heat exchanger 3, there is no need for the first heating device 5 and the second heating device 8 to share the heat exchange burden of the outdoor heat exchanger 3. At this time, by controlling the second control valve 7 to connect the E port and the G port, the second flow channel 54 of the first heating device 5 and the fourth flow channel 84 of the second heating device 8 are bypassed, so that the refrigerant does not need to enter the second flow channel 54 and the fourth flow channel 84 for further heat absorption, improving the energy efficiency of the air-conditioning system.

[0126] It can be understood that since the refrigerant no longer flows into the second flow channel 54 and the fourth flow channel 84 for heat exchange, the refrigerant flowing through the first flow channel 53 and the third flow channel 83 will no longer release heat, but directly flow into the indoor heat exchanger 2 to release heat.

[0127] When the air-conditioning system is in the cooling mode, such as Figure 16As shown, the operating state of the air conditioning system is as follows: The outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant passes through the first flow channel 53, port B, port C, port E, port G, and the second end 32 of the outdoor heat exchanger 3 and enters the outdoor heat exchanger 3 to release heat. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant passes through the first end 31 of the outdoor heat exchanger 3 and the second end 42 of the throttle valve 4 and enters the throttle valve 4 to reduce pressure. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant passes through the first end 41 of the throttle valve 4, the third flow channel 83, and the first end 21 of the indoor heat exchanger 2 and enters the indoor heat exchanger 2 to absorb heat, thereby cooling the indoor space. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant passes through the second end 22 of the indoor heat exchanger 2, port A, port D, and the inlet end 12 of the compressor 1 and enters the compressor to be compressed, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0128] In the above process, the controller controls the first control valve 6 and the second control valve 7, thereby realizing the cooling mode of the air conditioning system. And since the air conditioning system is in the cooling mode at this time, there is no need for the first heating device 5 and the second heating device 8 to further heat the high-temperature and high-pressure refrigerant flowing out from the outlet end 11 of the compressor 1. Therefore, by controlling the second control valve 7 to connect port E and port G, the second flow channel 54 and the fourth flow channel 84 are both bypassed, so that the refrigerant does not need to enter the first heating device 5 and the second heating device 8 anymore.

[0129] It can be understood that since the refrigerant no longer flows into the second flow channel 54 and the fourth flow channel 84 for heat exchange, the refrigerant flowing through the first flow channel 53 and the third flow channel 83 will not release heat either.

[0130] The embodiment of the present disclosure provides an air conditioning system. When the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range, it means that the outdoor heat exchanger 3 is in an environment where it is prone to frosting at low temperature. At this time, the controller can control the connection between port A and port B of the first control valve 6, the connection between port C and port D, and control the connection between port E and port F of the second control valve 7, so that the low-temperature and low-pressure refrigerant can first absorb a part of the heat in the outdoor heat exchanger 3, then flow into the second heating device 8 to absorb another part of the heat, and then flow into the first heating device 5 to absorb a part of the heat. In this way, both the second heating device 8 and the first heating device 5 can share a part of the heat exchange burden of the outdoor heat exchanger 3, further reducing the heat exchange degree of the outdoor heat exchanger 3, thereby delaying the frosting duration of the outdoor heat exchanger 3, and further reducing the frequency of reverse defrosting, increasing the heating efficiency of the air conditioning system in the heating mode.

[0131] In an embodiment of the present disclosure, the air conditioning system may further include a third heating device 9, such as Figure 17 shown, the first end 91 of the third heating device 9 communicates with the second end 32 of the outdoor heat exchanger 3, and the second end 92 of the third heating device 9 communicates with the first end 51 of the first heating device 5 and the G port.

[0132] When the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range, such as Figure 18 described, the working state of the air conditioning system is: the outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the indoor heat exchanger 2 through the B port, A port, and the second end 22 of the indoor heat exchanger 2 to release heat, thereby heating the indoor space. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant enters the throttle valve 4 through the first end 21 of the indoor heat exchanger 2 and the first end 41 of the throttle valve 4 to reduce the pressure. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the outdoor heat exchanger 3 through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 to absorb heat. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant enters the third heating device 9 through the second end 32 of the outdoor heat exchanger 3 and the first end 91 of the third heating device 9 for secondary heat absorption. The refrigerant after secondary heat absorption enters the first heating device 5 through the second end 92 of the third heating device 9 and the first end 51 of the first heating device 5 for tertiary heat absorption. The refrigerant after tertiary heat absorption enters the compressor 1 through the second end 52 of the first heating device 5, F port, E port, C port, D port, and the inlet end 12 of the compressor 1 for compression, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0133] In the above process, the controller controls the first control valve 6 and the second control valve 7, thereby realizing the heating mode of the air conditioning system, and connecting both the third heating device 9 and the first heating device 5 between the second end 32 of the outdoor heat exchanger 3 and the inlet end 12 of the compressor 1, so that the third heating device 9 and the first heating device 5 can share a part of the heat exchange burden of the outdoor heat exchanger 3, further reducing the heat exchange degree of the outdoor heat exchanger 3, thereby delaying the frosting duration of the outdoor heat exchanger 3, and further reducing the frequency of reverse defrosting, increasing the heating efficiency of the air conditioning system in the heating mode.

[0134] When the air conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range, such as Figure 19As described above, the operating state of the air-conditioning system is as follows: The outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the indoor heat exchanger 2 through port B, port A, and the second end 22 of the indoor heat exchanger 2 to release heat, thereby heating the indoor space. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant enters the throttle valve 4 through the first end 21 of the indoor heat exchanger 2 and the first end 41 of the throttle valve 4 to reduce pressure. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the outdoor heat exchanger 3 through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 to absorb heat. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant enters the third heating device 9 through the second end 32 of the outdoor heat exchanger 3 and the first end 91 of the third heating device 9 for a second heat absorption. The refrigerant after the second heat absorption enters the compressor 1 through the second end 92 of the third heating device 9, port G, port E, port C, port D, and the inlet end 12 of the compressor 1 for compression, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0135] In the above process, the controller realizes the heating mode of the air-conditioning system by controlling the first control valve 6 and the second control valve 7. Moreover, since the frosting time of the outdoor heat exchanger 3 is relatively slow, the second control valve 7 can be controlled to connect port E and port G, thereby bypassing the first heating device 5 and only leaving the third heating device 9, so that the refrigerant no longer enters the first heating device 5 for a third heating, improving the energy efficiency of the air-conditioning system.

[0136] When the air-conditioning system is in the cooling mode, as Figure 20 shown, the operating state of the air-conditioning system is as follows: The outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the third heating device 9 through port B, port C, port E, port G, and the second end 92 of the third heating device 9 for heating. The heated refrigerant enters the outdoor heat exchanger 3 through the first end 91 of the third heating device 9 and the second end 32 of the outdoor heat exchanger 3 to release heat. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant enters the throttle valve 4 through the first end 31 of the outdoor heat exchanger 3 and the second end 42 of the throttle valve 4 to reduce pressure. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the indoor heat exchanger 2 through the first end 41 of the throttle valve 4 and the first end 21 of the indoor heat exchanger 2 to absorb heat, thereby cooling the indoor space. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant enters the compressor through the second end 22 of the indoor heat exchanger 2, port A, port D, and the inlet end 12 of the compressor 1 for compression, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0137] In the above process, the controller controls the first control valve 6 and the second control valve 7, thereby realizing the refrigeration mode of the air-conditioning system. Moreover, the high-temperature and high-pressure refrigerant output by the compressor 1 is further heated by the third heating device 9 and then enters the outdoor heat exchanger 3 to release heat, improving the heat exchange efficiency of the refrigerant in the outdoor heat exchanger 3 and thus enhancing the refrigeration efficiency of the air-conditioning system.

[0138] In a possible implementation manner, the third heating device 9 may be an electric heating device. Of course, it may also be other reasonable heating devices, and the embodiments of the present disclosure do not make specific limitations thereto.

[0139] The air-conditioning system provided with the third heating device 9 is more suitable for an environment where the outdoor heat exchanger 3 will frost in the outdoor environment but the frosting is relatively slow. In such an environment, the heating degree of the third heating device 9 can be set to be less than that of the first heating device 5. In this way, when the air-conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range (the outdoor heat exchanger 3 is in an environment where frosting is relatively fast), the first heating device 5 and the third heating device 9 can be used together to share the heat exchange burden for the outdoor heat exchanger 3. When the air-conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range (the outdoor heat exchanger 3 is in an environment where frosting is relatively slow), the heat exchange burden for the outdoor heat exchanger 3 can be borne only by the third heating device 9.

[0140] In the embodiments of the present disclosure, the air-conditioning system may further include a heat exchange device 10, as Figure 21 shown, the heat exchange device 10 has a fifth flow channel 101 and a sixth flow channel 102 that exchange heat with each other.

[0141] The first end 1011 of the fifth flow channel 101 is communicated with the first end 21 of the indoor heat exchanger 2, the second end 1012 of the fifth flow channel 101 is communicated with the first end 41 of the throttle valve 4, and the second end 1022 of the sixth flow channel 102 is communicated with the first end 51 of the first heating device 5 and the G port.

[0142] When the air-conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range, as Figure 22As described above, the operating state of the air-conditioning system is as follows: The outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant enters the first flow channel 53 through the second end 532 of the first flow channel 53 and releases heat in the first flow channel 53. After releasing heat, the refrigerant passes through the first end 531 of the first flow channel 53, port B, port A, and the second end 22 of the indoor heat exchanger 2 and enters the indoor heat exchanger 2 to release heat, thereby heating the interior of the room. The refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant passes through the first end 21 of the indoor heat exchanger 2 and the first end 1011 of the fifth flow channel 101 and enters the fifth flow channel 101 to release heat again. After releasing heat, the refrigerant passes through the second end 1012 of the fifth flow channel 101 and the first end 41 of the throttle valve 4 and enters the throttle valve 4 to reduce pressure, becoming low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant passes through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 and enters the outdoor heat exchanger 3 to perform the first heat absorption. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant passes through the second end 32 of the outdoor heat exchanger 3 and the first end 1021 of the sixth flow channel 102 and enters the sixth flow channel 102 to perform the second heat absorption, that is, to absorb the heat released by the fifth flow channel 101. After the second heat absorption, the refrigerant passes through the second end 1022 of the sixth flow channel 102 and the first end of the second flow channel 54 and enters the second flow channel 54 to perform the third heat absorption, that is, to absorb the heat released by the first flow channel 53. After heat absorption, the refrigerant passes through the second end of the second flow channel 54, port F, port E, port C, port D, and the inlet end 12 of the compressor 1 and enters the compressor 1 to be compressed, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0143] In the above process, after the refrigerant absorbs heat in the outdoor heat exchanger 3, it also performs low-temperature heat exchange in the heat exchange device 10 and high-temperature heat exchange in the first heating device 5. In this way, both the first heating device 5 and the heat exchange device 10 share a large part of the heat exchange burden for the outdoor heat exchanger 3, greatly reducing the heat exchange degree of the outdoor heat exchanger 3, thereby delaying the frosting duration of the outdoor heat exchanger 3, and further reducing the frequency of reverse defrosting, increasing the heating efficiency of the air-conditioning system in the heating mode.

[0144] Moreover, although the refrigerant releases heat in the first flow channel 53 and the fifth flow channel 101, the controller can control the superheat degree at the inlet end 12 of the compressor 1 to be within the preset superheat degree range by adjusting the opening degree of the throttle valve 4, and can increase the flow rate of the high-temperature and high-pressure refrigerant flowing out from the outlet end 11 of the compressor 1. In this way, it is ensured that the refrigerant can release heat in the first flow channel 53, the indoor heat exchanger 2, and the fifth flow channel 101, and the first heating device 5, the indoor heat exchanger 2, and the heat exchange device 10 can all work with normal working efficiency.

[0145] When the air conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range, as Figure 23 shown, the operating state of the air conditioning system is as follows: The outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant passes through the first flow channel 53, port B, port A, and the second end 22 of the indoor heat exchanger 2 and enters the indoor heat exchanger 2 to release heat, thereby heating the room. The high-temperature and high-pressure refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant passes through the first end 21 of the indoor heat exchanger 2 and the first end 1011 of the fifth flow channel 101 and enters the fifth flow channel 101 to release heat. The refrigerant after heat release passes through the second end 1012 of the fifth flow channel 101 and the first end 41 of the throttle valve 4 and enters the throttle valve 4 for pressure reduction. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant passes through the second end 42 of the throttle valve 4 and the first end 31 of the outdoor heat exchanger 3 and enters the outdoor heat exchanger 3 to absorb heat. The low-temperature and low-pressure refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant passes through the second end 32 of the outdoor heat exchanger 3 and the first end 1021 of the sixth flow channel 102 and enters the sixth flow channel 102 to absorb the heat released by the fifth flow channel 101. The refrigerant after heat absorption passes through the second end 1022 of the sixth flow channel 102, port G, port E, port C, port D, and the inlet end 12 of the compressor 1 and enters the compressor 1 for compression, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0146] In the above process, the controller realizes the heating mode of the air conditioning system by controlling the first control valve 6 and the second control valve 7. And because the frosting time of the outdoor heat exchanger 3 is relatively slow, therefore, the second control valve 7 can be controlled to connect port E and port G, thereby bypassing the second flow channel 54 and only leaving the heat exchange device 10, so that the refrigerant no longer enters the first heating device 5 for the third heating, improving the energy efficiency of the air conditioning system.

[0147] It can be understood that since the refrigerant no longer flows into the second flow channel 54 for heat exchange, the refrigerant flowing through the first flow channel 53 will no longer exchange heat.

[0148] When the air conditioning system is in the cooling mode, as Figure 24As shown, the operating state of the air conditioning system is as follows: The outlet end 11 of the compressor 1 outputs high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant passes through the first flow channel 53, port B, port C, port E, port G, and the second end 1022 of the sixth flow channel 102 and enters the sixth flow channel 102 to release heat. After releasing heat, the refrigerant passes through the first end 1021 of the sixth flow channel 102 and the second end 32 of the outdoor heat exchanger 3 and enters the outdoor heat exchanger 3 to release heat. The refrigerant becomes low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant passes through the first end 31 of the outdoor heat exchanger 3 and the second end 42 of the throttle valve 4 and enters the throttle valve 4 to reduce pressure. The low-temperature and high-pressure refrigerant becomes low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant passes through the first end 41 of the throttle valve 4 and the second end 1012 of the fifth flow channel 101 and enters the fifth flow channel 101 to absorb heat. After absorbing heat, the refrigerant passes through the first end 1011 of the fifth flow channel 101 and the first end 21 of the indoor heat exchanger 2 and enters the indoor heat exchanger 2 to absorb heat, thereby cooling the room. The refrigerant becomes high-temperature and low-pressure refrigerant. The high-temperature and low-pressure refrigerant passes through the second end 22 of the indoor heat exchanger 2, port A, port D, and the inlet end 12 of the compressor 1 and enters the compressor to be compressed, thereby obtaining high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant flows out from the outlet end 11 of the compressor 1, thus realizing the cycle.

[0149] In the above process, the controller realizes the cooling mode of the air conditioning system by controlling the first control valve 6 and the second control valve 7.

[0150] Although the air conditioning system provided with the heat exchange device 10 reduces the cooling efficiency to a certain extent when in the cooling mode, generally speaking, it has a higher heating efficiency when in the heating mode, delays the frosting duration, reduces the frequency of reverse defrosting, and increases the heating efficiency of the air conditioning system when in the heating mode.

[0151] As Figure 25 shown, experimental results prove that when in the heating mode at 21 degrees Celsius, Figure 21 the air conditioning system of the present disclosure shown in the figure can extend the continuous heating duration from 50 minutes in the related art to 85 minutes, significantly extending the heating duration, and the comprehensive energy efficiency COP is increased by about 5%.

[0152] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. An air conditioning system, characterized in that, The air conditioning system includes a compressor (1), an indoor heat exchanger (2), an outdoor heat exchanger (3), a throttle valve (4), a first heating device (5), a second heating device (8), a first control valve (6), a second control valve (7), a temperature sensor, and a controller; The second end (42) of the throttle valve (4) communicates with the first end (31) of the outdoor heat exchanger (3); The second heating device (8) is a low-temperature regenerator. The second heating device (8) has a third flow channel (83) and a fourth flow channel (84). The first end (831) of the third flow channel (83) communicates with the first end (21) of the indoor heat exchanger (2). The second end (832) of the third flow channel (83) communicates with the first end (41) of the throttle valve (4). The first end of the fourth flow channel (84) communicates with the second end (32) of the outdoor heat exchanger (3). The second end of the fourth flow channel (84) communicates with the first end (51) of the first heating device (5); The first control valve (6) has a port A, a port B, a port C, and a port D. The port A communicates with the second end (22) of the indoor heat exchanger (2). The port B communicates with the outlet end (11) of the compressor (1). The port D communicates with the inlet end (12) of the compressor (1); The second control valve (7) has a port E, a port F, and a port G. The port E communicates with the port C. The port F communicates with the second end (52) of the first heating device (5). The port G communicates with the second end (32) of the outdoor heat exchanger (3); The temperature sensor is used to detect the outdoor temperature; When the air conditioning system is in the heating mode and the outdoor temperature is within the preset temperature range, the controller is used to control the communication between the port A and the port B, control the communication between the port C and the port D, and control the communication between the port E and the port F.

2. The air conditioning system according to claim 1, wherein The controller is further used to control the opening degree of the throttle valve (4) so that the superheat degree at the inlet end (12) of the compressor (1) is within the preset superheat degree range.

3. The air conditioning system according to claim 1, wherein When the air conditioning system is in the heating mode and the outdoor temperature is outside the preset temperature range, the controller is further used to control the communication between the port A and the port B, control the communication between the port C and the port D, and control the communication between the port E and the port G.

4. The air conditioning system according to claim 1, characterized in that, When the air conditioning system is in the cooling mode, the controller is further used to control the communication between the port A and the port D, control the communication between the port B and the port C, and control the communication between the port E and the port G.

5. The air conditioning system according to claim 1, characterized in that, The first heating device (5) is an electric heating device; or, The first heating device (5) is a high-temperature recuperator. The first heating device (5) has a first flow channel (53) and a second flow channel (54). The first end (531) of the first flow channel (53) is communicated with the B port. The second end (532) of the first flow channel (53) is communicated with the outlet end (11) of the compressor (1). The first end of the second flow channel (54) is the first end (51) of the first heating device (5), and the second end of the second flow channel (54) is the second end (52) of the first heating device (5).

Images