An air conditioning system and a defrosting control method of an air conditioning system

Abstract

The application discloses an air conditioning system and a defrosting control method of the air conditioning system, relates to the technical field of air conditioning, and can improve the comfort of users to a certain extent. The air conditioning system comprises a compressor, a first reversing component, a second reversing component, an indoor heat exchanger, an outdoor heat exchanger component, a bypass branch and a defrosting branch. The first reversing component is provided with first to fourth valve ports. The first valve port is connected with an exhaust port. The fourth valve port is connected with a suction port. The second reversing component is provided with first to third ports. The first port is connected with the exhaust port. The second port is connected with the suction port. The outdoor heat exchanger component comprises a first part and a second part. The first end of the first part is connected with the third valve port. The first end of the second part is connected with the third port. The first end of the defrosting branch is connected with the exhaust port. The second end of the defrosting branch is connected with the second end of the first part. The bypass branch is provided with a third throttling valve in series. The air conditioning system is used for air conditioning.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning technology, and in particular to an air conditioning system and a defrosting control method of the air conditioning system. BACKGROUND

[0002] When the air conditioning system is in heating operation, the outdoor heat exchanger assembly will frost when the temperature and humidity of the external environment reach certain conditions. In the related art, the air conditioning system uses reverse defrosting to defrost the outdoor heat exchanger assembly, and the refrigerant in heating is made to flow reversely, the refrigerant discharged by the compressor is supplied to the outdoor heat exchanger assembly, and the heat of the compressor is used to defrost the outdoor heat exchanger assembly. When reverse defrosting, the air conditioning system stops heating indoors, and the indoor heat exchanger also needs to absorb part of the heat from indoors, which reduces the temperature indoors and seriously affects the thermal comfort indoors, and reduces the user experience. SUMMARY

[0003] Embodiments of the present application provide an air conditioning system and a defrosting control method of the air conditioning system, which can improve the comfort of users to a certain extent.

[0004] To achieve the above-mentioned purpose, embodiments of the present application adopt the following technical solutions:

[0005] The first aspect of the present application provides an air conditioning system, comprising: a compressor, a first reversing assembly, a second reversing assembly, an indoor heat exchanger, an outdoor heat exchanger assembly, a bypass branch and a defrosting branch. The compressor has a suction port and a discharge port; the first reversing assembly has first to fourth valve ports, the first valve port is connected with the discharge port, the fourth valve port is connected with the suction port, the first valve port is reversely connected with one of the second valve port and the third valve port, and the fourth valve port is reversely connected with the other one of the second valve port and the third valve port; the second reversing assembly has first to third ports, the first port is connected with the discharge port, the second port is connected with the suction port, and the third port is reversely connected with one of the first port and the second port; the first end of the indoor heat exchanger is connected with the second valve port; the outdoor heat exchanger assembly comprises a first part and a second part, the first end of the first part is connected with the third valve port, the first end of the second part is connected with the third port, the second end of the first part and the second end of the indoor heat exchanger are connected with a first throttle valve, and the second end of the second part and the second end of the indoor heat exchanger are connected with a second throttle valve; the first end of the defrosting branch is connected with the discharge port, the second end of the defrosting branch is connected to the pipeline between the first throttle valve and the second end of the first part, and a first on-off valve is connected in series on the defrosting branch; the first end of the bypass branch is connected to the pipeline between the first throttle valve and the second end of the first part, the second end of the bypass branch is connected to the pipeline between the second throttle valve and the second end of the second part, and a third throttle valve is connected in series on the bypass branch.

[0006] The air conditioning system provided by the embodiments of the present application comprises a first part and a second part arranged in parallel, when the first part is defrosted, the air conditioning system uses part of the refrigerant in the discharge port of the bypass compressor to defrost the first part, at this time, the second part can continue to ensure the heating cycle of the air conditioning system as an evaporator, or the second part is closed so that the second part does not participate in the heating cycle of the air conditioning system, and the refrigerant flowing out of the indoor heat exchanger passes through the first part, thereby continuing to ensure the heating cycle of the air conditioning system. When the second part is defrosted, the air conditioning system can use the second reversing assembly to reverse part of the refrigerant in the discharge port of the bypass compressor to the second part, and make the refrigerant in the second part cool into high-temperature medium-pressure gaseous refrigerant, and make the refrigerant flowing out of the second part flow to the first part, so that the latent heat of the refrigerant can be used to defrost the second part, at this time, the first part can continue to ensure the heating cycle of the air conditioning system as an evaporator. Thus, the first part and the second part can be defrosted in turn while the indoor heat exchanger still ensures the heating state of the indoor, which can avoid affecting the temperature of the indoor during the defrosting process of the air conditioning system, so that the indoor can maintain a high-temperature state, and the comfort of the user can be improved. Moreover, the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port of the compressor is used to defrost the first part, and the defrosting effect is remarkable. The latent heat of the refrigerant is used to defrost the second part, and the defrosting effect is remarkable. Thus, by using the defrosting mode combining low-pressure sensible heat and high-pressure waste heat, the advantages of waste heat defrosting and sensible heat defrosting can be utilized, and the problems of serious waste of waste heat defrosting capacity, poor reliability of sensible heat defrosting and narrow applicable working conditions can be avoided, thereby the defrosting speed and reliability of the air conditioning system can be improved to a certain extent. In addition, the first part and the second part are connected by the bypass branch, and the third throttling valve is arranged on the bypass branch, so that the pressure loss at the second throttling valve can be eliminated, and the defrosting effect of the air conditioning system can be improved.

[0007] In some embodiments, the first part is located directly above the second part.

[0008] In some embodiments, the first part is located directly below the second part.

[0009] In some embodiments, the first reversing assembly is a four-way reversing valve; and / or, the second reversing assembly is a three-way reversing valve or a four-way reversing valve, wherein, when the second reversing assembly is a four-way reversing valve, the second reversing assembly further comprises a fourth port, the fourth port is blocked, and the fourth port is in communication with the other one of the first port and the second port.

[0010] In some embodiments, the first throttling valve, the second throttling valve and the third throttling valve are all electronic expansion valves.

[0011] In some embodiments, the first part and the second part are two independent heat exchangers, or the first part and the second part are two parts of one heat exchanger.

[0012] In some embodiments, the air conditioning system further comprises a gas-liquid separator having a liquid inlet connected to the fourth valve port and a gas outlet connected to the suction port; and a heating device for heating the gas-liquid separator.

[0013] In some embodiments, the air conditioning system further comprises a first supercooling device connected between the first throttling valve and the second end of the indoor heat exchanger, and a second supercooling device connected between the second throttling valve and the second end of the indoor heat exchanger.

[0014] The second aspect embodiment of the present application provides a defrosting control method of an air conditioning system. The defrosting control method is applied to the air conditioning system described above. The defrosting control method comprises the following steps: when the air conditioning system is running in a heating mode, determining whether the air conditioning system meets defrosting conditions; if yes, controlling the air conditioning system to run a first defrosting mode, in which one of the first part and the second part is defrosted; determining whether the air conditioning system meets a first defrosting mode end condition; if yes, controlling the air conditioning system to exit the first defrosting mode and run a second defrosting mode, in which the other of the first part and the second part is defrosted; determining whether the air conditioning system meets a second defrosting mode end condition; if yes, controlling the air conditioning system to exit the second defrosting mode; wherein in the heating mode, the first valve port and the second valve port are connected, the third valve port and the fourth valve port are connected, the second end port and the third end port are connected, the first throttling valve throttles, the second throttling valve throttles, the third throttling valve is fully closed, and the first on-off valve is closed; when the first part is defrosted, the second end port and the third end port are connected, the first throttling valve is fully closed, the second throttling valve throttles, the third throttling valve is fully closed, and the first on-off valve is opened; or when the first part is defrosted, the second end port and the third end port are connected, the first throttling valve throttles, the second throttling valve is fully closed, the third throttling valve is fully closed, and the first on-off valve is opened; when the second part is defrosted, the first end port and the third end port are connected, the first throttling valve throttles, the second throttling valve is fully closed, the third throttling valve throttles, and the first on-off valve is closed.

[0015] The defrosting control method of the air conditioning system provided by the embodiments of the present application can realize the defrosting of the first part and the second part in turn, while still ensuring the heating state of the indoor heat exchanger to the indoor, and can avoid the influence on the indoor temperature during the defrosting of the air conditioning system, so that the indoor can maintain a high temperature state, which is beneficial to improve the comfort of the user. Moreover, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor is used to defrost the first part, and the defrosting effect is remarkable. The latent heat of the refrigerant is used to defrost the second part, and the defrosting effect is remarkable. Therefore, by using the defrosting mode combining the low-pressure sensible heat and the high-pressure waste heat, the advantages of the waste heat defrosting and the sensible heat defrosting can be utilized, while the problems of the serious waste of the waste heat defrosting capacity, the poor reliability of the sensible heat defrosting, and the narrow applicable working condition can be avoided, and thus the defrosting speed and the reliability of the air conditioning system can be improved to a certain extent.

[0016] The air conditioning system provided by the embodiments of the present application can produce the same beneficial effects as the above-mentioned defrosting control method of the air conditioning system, and details are not repeated here.

[0017] In some embodiments, in the first defrosting mode, the first part is defrosted, and in the second defrosting mode, the second part is defrosted; wherein the first defrosting mode end condition is that the temperature Tg1 of the first end of the first part is greater than or equal to Tgo1 and lasts for a first preset time; and / or the second defrosting mode end condition is that the temperature Tg2 of the second end of the second part is greater than or equal to Tgo2 and lasts for a second preset time.

[0018] In some embodiments, in the first defrosting mode, the second part is defrosted, and in the second defrosting mode, the first part is defrosted; wherein the first defrosting mode end condition is that the temperature Tg2 of the second end of the second part is greater than or equal to Tgo2 and lasts for a second preset time; and / or the second defrosting mode end condition is that the temperature Tg1 of the first end of the first part is greater than or equal to Tgo1 and lasts for a first preset time.

[0019] In some embodiments, the air conditioning system further comprises: a gas-liquid separator having a liquid inlet and a gas outlet, the liquid inlet being connected to the fourth valve port, and the gas outlet being connected to the suction port; and a heating device for heating the gas-liquid separator; the method further comprises the following steps: after the air conditioning system exits the second defrosting mode, controlling the air conditioning system to run a heating start-up mode; determining whether the air conditioning system satisfies a heating start-up mode end condition; if yes, controlling the air conditioning system to exit the heating start-up mode and run a heating mode; wherein, in the heating start-up mode, the second port and the third port are controlled to be in conduction; the first throttling valve is throttled, the second throttling valve is throttled, the third throttling valve is fully closed, the first on-off valve is closed, and the heating device is turned on; in the heating mode, the heating device is turned off.

[0020] In some embodiments, the heating start-up mode exit condition is that the temperature Tg3 of the indoor heat exchanger is greater than or equal to Tgo3 and lasts for a third preset time.

[0021] In some embodiments, the first portion is located directly above the second portion, the first portion is defrosted in the first defrosting mode, and the second portion is defrosted in the second defrosting mode; or, the second portion is located directly above the first portion, the second portion is defrosted in the first defrosting mode, and the first portion is defrosted in the second defrosting mode.

[0022] The third aspect embodiment of the present application provides a defrosting control method of an air conditioning system, which is based on an air conditioning system in which a first portion is located directly above a second portion. The defrosting control method comprises the following steps: when running a heating mode, determining whether the air conditioning system satisfies a defrosting condition; if yes, controlling the air conditioning system to run a first defrosting mode, in which one of the first portion and the second portion is defrosted; determining whether the air conditioning system satisfies a first defrosting mode end condition; if yes, controlling the air conditioning system to exit the first defrosting mode and run a second defrosting mode, in which the other of the first portion and the second portion is defrosted; determining whether the air conditioning system satisfies a second defrosting mode end condition; if yes, controlling the air conditioning system to exit the second defrosting mode; wherein, in the heating mode, the first valve port and the second valve port are controlled to be in conduction, the third valve port and the fourth valve port are controlled to be in conduction, the second port and the third port are controlled to be in conduction, the first throttling valve is throttled, the second throttling valve is throttled, and the first on-off valve is closed; the second port and the third port are controlled to be in conduction; the first throttling valve is throttled, the second throttling valve is fully closed, the third throttling valve is fully closed, and the first on-off valve is opened; when defrosting the second portion, the first port and the third port are controlled to be in conduction, the first throttling valve is throttled, the second throttling valve is fully opened, and the first on-off valve is closed.

[0023] The defrosting control method of the air conditioning system provided by the embodiments of the present application is as follows: when the first part is defrosted, the air conditioning system uses part of the refrigerant in the exhaust port of the bypass compressor to defrost the first part; at this time, the second part is closed so that the second part does not participate in the heating cycle of the air conditioning system, and the refrigerant flowing out of the indoor heat exchanger passes through the first part, thereby continuously ensuring the heating cycle of the air conditioning system. When the second part is defrosted, the second reversing assembly is used to reverse part of the refrigerant in the exhaust port of the bypass compressor to the second part, and the refrigerant is cooled to high-temperature medium-pressure gaseous refrigerant in the second part, and the refrigerant flowing out of the second part can flow to the first part, so that the latent heat of the refrigerant is used to defrost the second part; at this time, the first part can continue to ensure the heating cycle of the air conditioning system as an evaporator. Thus, the first part and the second part can be defrosted in turn while the indoor heat exchanger still ensures the heating state of the indoor, which can avoid affecting the temperature of the indoor during the defrosting process of the air conditioning system, so that the indoor can maintain a high-temperature state, and the comfort of the user is improved. In addition, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor is used to defrost the first part, and the defrosting effect is remarkable. The latent heat of the refrigerant is used to defrost the second part, and the defrosting effect is remarkable. Thus, by using the defrosting mode combining low-pressure sensible heat and high-pressure waste heat, the advantages of waste heat defrosting and sensible heat defrosting can be utilized, and the problems of serious waste of waste heat defrosting capacity, poor reliability of sensible heat defrosting, and narrow applicable working conditions can be avoided, thereby improving the defrosting speed and reliability of the air conditioning system to a certain extent. In addition, since the first part is located directly above the second part, when the first part is defrosted, the second part is not used as an evaporator by fully closing the second throttling valve, so that the defrosting water of the first part does not fall on the second part, and the problem of icing of the second part is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A composition schematic diagram of an air conditioning system provided by the first embodiment of the present application is provided.

[0025] Figure 2 A refrigeration mode schematic diagram of the air conditioning system provided by the first embodiment of the present application is provided.

[0026] Figure 3 A heating mode schematic diagram of the air conditioning system provided by the first embodiment of the present application is provided.

[0027] Figure 4 A defrosting schematic diagram of the air conditioning system provided by the first embodiment of the present application is provided.

[0028] Figure 5The schematic diagram of the air conditioning system provided by the first embodiment of the present application for defrosting the second part;

[0029] Figure 6 The schematic diagram of the air conditioning system provided by the second embodiment of the present application;

[0030] Figure 7 The schematic diagram of the air conditioning system provided by the third embodiment of the present application;

[0031] Figure 8 The schematic diagram of the air conditioning system provided by the fourth embodiment of the present application;

[0032] Figure 9 The flow chart of the first defrosting control method of the air conditioning system provided by the embodiments of the present application;

[0033] Figure 10 The flow chart of the second defrosting control method of the air conditioning system provided by the embodiments of the present application;

[0034] Figure 11 The flow chart of the third defrosting control method of the air conditioning system provided by the embodiments of the present application;

[0035] Figure 12 The flow chart of the fourth defrosting control method of the air conditioning system provided by the embodiments of the present application;

[0036] Figure 13 The flow chart of the fifth defrosting control method of the air conditioning system provided by the embodiments of the present application.

[0037] Reference signs:

[0038] 100, air conditioning system; 1, compressor; 11, suction port; 12, discharge port; 2, first switching assembly; 21, first valve port; 22, second valve port; 23, third valve port; 24, fourth valve port; 3, indoor heat exchanger; 31, first stop valve; 32, second stop valve; 33, indoor fan; 4, outdoor heat exchanger assembly; 41, first part; 411, first part temperature sensor; 42, second part; 421, second part temperature sensor; 43, first throttling valve; 44, second throttling valve; 45, outdoor fan; 46, first supercooling device; 47, second supercooling device; 5, second switching assembly; 51, first port; 52, second port; 53, third port; 6, defrosting branch; 61, first on-off valve; 7, gas-liquid separator; 71, liquid inlet; 72, gas outlet; 73, heating device; 8, bypass branch; 81, third throttling valve. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0040] In the description of the present application, it is to be understood by the terms "center", "upper", "lower", "front", "back", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] The terms "first", "second", are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the meaning of "a plurality of" is two or more.

[0042] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] The air conditioning system of the embodiment of the present application is described below.

[0044] Please refer to Figure 1 , Figure 1 The composition schematic diagram of an air conditioning system provided by the first embodiment of the present application. The embodiment of the present application provides an air conditioning system 100, which comprises a compressor 1, a first reversing assembly 2, a second reversing assembly 5, an indoor heat exchanger 3, an outdoor heat exchanger assembly 4 and a defrosting branch 6.

[0045] Please continue to refer to Figure 1 , the compressor 1 has a suction port 11 and a discharge port 12. Specifically, the suction port 11 of the compressor 1 is used for suction, and the refrigerant enters the compression chamber of the compressor 1 through the suction port 11 for compression to form high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant gas is discharged from the discharge port 12 of the compressor 1 to enter the air conditioning system 100 for circulation of the refrigerant. Exemplarily, the compressor 1 can be a scroll compressor, a rotor compressor, a screw compressor or other types of compressors.

[0046] Please continue to refer to Figure 1The first reversing assembly 2 has a first valve port 21, a second valve port 22, a third valve port 23 and a fourth valve port 24. The first valve port 21 is connected with the exhaust port 12. The fourth valve port 24 is connected with the suction port 11. The first valve port 21 can be reversely communicated with one of the second valve port 22 and the third valve port 23, and the fourth valve port 24 can be reversely communicated with the other one of the second valve port 22 and the third valve port 23. That is, when the first valve port 21 is reversely communicated with the second valve port 22, the third valve port 23 is reversely communicated with the fourth valve port 24; when the first valve port 21 is reversely communicated with the third valve port 23, the second valve port 22 is reversely communicated with the fourth valve port 24.

[0047] For example, the first reversing assembly 2 can be a four-way reversing valve. When the four-way reversing valve is powered on, the first valve port 21 is reversely communicated with the second valve port 22, and the third valve port 23 is reversely communicated with the fourth valve port 24; when the four-way reversing valve is powered off, the first valve port 21 is reversely communicated with the third valve port 23, and the second valve port 22 is reversely communicated with the fourth valve port 24. Of course, it can be understood that in other examples, when the four-way reversing valve is powered off, the first valve port 21 is reversely communicated with the second valve port 22, and the third valve port 23 is reversely communicated with the fourth valve port 24; when the four-way reversing valve is powered on, the first valve port 21 is reversely communicated with the third valve port 23, and the second valve port 22 is reversely communicated with the fourth valve port 24.

[0048] Please continue to refer to Figure 1 The second reversing assembly 5 has a first port 51, a second port 52 and a third port 53. The first port 51 is connected with the exhaust port 12. The second port 52 is connected with the suction port 11. The third port 53 is reversely communicated with one of the first port 51 and the second port 52. That is, the third port 53 can be reversely communicated with the first port 51, and the third port 53 can also be reversely communicated with the second port 52.

[0049] For example, the second reversing assembly 5 can be a three-way reversing valve or a four-way reversing valve. When the second reversing assembly 5 is a four-way reversing valve, the second reversing assembly 5 further includes a fourth port, the fourth port is blocked, and the fourth port is reversely communicated with the other one of the first port 51 and the second port 52. When the three-way reversing valve or the four-way reversing valve is powered on, the first port 51 is reversely communicated with the third port 53; when the three-way reversing valve or the four-way reversing valve is powered off, the second port 52 is reversely communicated with the third port 53. Of course, it can be understood that in other examples, when the three-way reversing valve or the four-way reversing valve is powered on, the second port 52 is reversely communicated with the third port 53; when the three-way reversing valve or the four-way reversing valve is powered off, the first port 51 is reversely communicated with the third port 53.

[0050] Please continue to refer to Figure 1 The first end of the indoor heat exchanger 3 is connected with the second valve port 22.

[0051] Please continue to refer to Figure 1The outdoor heat exchanger assembly 4 comprises a first part 41 and a second part 42. The first end of the first part 41 is connected with the third valve port 23. Thus, the first end of the first part 41 can be in communication with the third valve port 23, and the communication between the first part 41 and the third valve port 23 can be controlled by the first switching assembly 2, which is beneficial to improve the reliability of the air conditioning system 100.

[0052] Please continue to refer to Figure 1 The first end of the second part 42 is connected with the third port 53. Thus, the first end of the second part 42 can be in communication with the third port 53, and the communication between the second part 42 and the third port 53 can be controlled by the second switching assembly 5, which is beneficial to improve the reliability of the air conditioning system 100.

[0053] Please continue to refer to Figure 1 The second end of the first part 41 and the second end of the indoor heat exchanger 3 are connected with the first throttling valve 43. The first throttling valve 43 can throttle and depress the refrigerant flowing therethrough. The first throttling valve 43 can also control the communication between the second end of the first part 41 and the second end of the indoor heat exchanger 3. That is, the opening of the first throttling valve 43 is adjustable. The first throttling valve 43 can have a fully open state (the opening is 100%), a fully closed state (the opening is 0) and a throttling state (the opening is between 0 and 100%). In the fully closed state of the first throttling valve 43, the second end of the first part 41 and the second end of the indoor heat exchanger 3 are not in communication. In the fully open state and the throttling state of the first throttling valve 43, the second end of the first part 41 and the second end of the indoor heat exchanger 3 are in communication, and in the throttling state, the first throttling valve 43 can throttle and depress the refrigerant flowing therethrough.

[0054] The second end of the second part 42 and the second end of the indoor heat exchanger 3 are connected with the second throttling valve 44. The second throttling valve 44 can throttle and depress the refrigerant flowing therethrough. The second throttling valve 44 can also control the communication between the second end of the second part 42 and the second end of the indoor heat exchanger 3. That is, the opening of the second throttling valve 44 is adjustable. The second throttling valve 44 can have a fully open state (the opening is 100%), a fully closed state (the opening is 0) and a throttling state (the opening is between 0 and 100%). In the fully closed state of the second throttling valve 44, the second end of the second part 42 and the second end of the indoor heat exchanger 3 are not in communication. In the fully open state and the throttling state of the first part 41, the second end of the second part 42 and the second end of the indoor heat exchanger 3 are in communication, and in the throttling state, the second throttling valve 44 can throttle and depress the refrigerant flowing therethrough.

[0055] Thus, the connection between the second end of the first portion 41 and the second end of the indoor heat exchanger 3 can be controlled by controlling the opening and closing of the first throttling valve 43, and the refrigerant flowing through the first throttling valve 43 can be throttled and depressurized by controlling the opening degree of the first throttling valve 43. The connection between the second end of the second portion 42 and the second end of the indoor heat exchanger 3 can be controlled by controlling the opening and closing of the second throttling valve 44, and the refrigerant flowing through the first throttling valve 43 can be throttled and depressurized by controlling the opening degree of the first throttling valve 43. Thus, the stability and reliability of the air conditioning system 100 can be improved.

[0056] Please continue to refer to Figure 1 The first end of the defrost branch 6 is connected to the exhaust port 12. The second end of the defrost branch 6 is connected to the pipeline between the first throttling valve 43 and the second end of the first portion 41. The first on-off valve 61 is connected in series on the defrost branch 6. The first on-off valve 61 can control the connection of the defrost branch 6. It can be understood that the second end of the defrost branch 6 is located between the first throttling valve 43 and the second end of the first portion 41, and the refrigerant in the defrost branch 6 can enter the first portion 41 directly without passing through the first throttling valve 43, so that the state of the refrigerant in the defrost branch 6 can be avoided by the first throttling valve 43, thereby ensuring that the refrigerant in the defrost branch 6 is in a high-temperature and high-pressure state. On the other hand, when the first portion 41 has frost, the first on-off valve 61 can be controlled to be opened, so that the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 12 can enter the first portion 41 along the defrost branch 6, thereby using the sensible heat of the compressor 1 exhaust to defrost the first portion 41. At the same time, when the first portion 41 does not need to be defrosted, the first on-off valve 61 can be controlled to be closed, so that the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 12 can be prevented from flowing to the defrost branch 6, thereby affecting the normal operation of the air conditioning system 100, and improving the reliability of the operation of the air conditioning system 100.

[0057] Please continue to refer to Figure 1The first end of the bypass branch 8 is connected to the second end of the first section 41. The second end of the bypass branch 8 is connected to the pipeline between the second throttle valve 44 and the second end of the second section 42. The third throttle valve 81 is connected in series to the bypass branch 8. The third throttle valve 81 can throttle the refrigerant flowing therethrough. The third throttle valve 81 can also control the connection between the second end of the second section 42 and the second end of the first section 41. That is, the third throttle valve 81 can be adjusted. The third throttle valve 81 can have a fully open state (100% opening), a fully closed state (0 opening) and a throttling state (0-100% opening). In the fully closed state of the third throttle valve 81, the second end of the second section 42 is not connected to the second end of the first section 41. In the fully open state and the throttling state of the first section 41, the second end of the second section 42 is connected to the second end of the first section 41, and in the throttling state, the third throttle valve 81 can throttle the refrigerant flowing therethrough.

[0058] The air conditioning system 100 according to the embodiments of the present application has a cooling mode, a heating mode and a defrosting mode. The control process and the flow direction of the refrigerant in the cooling mode, the heating mode and the defrosting mode of the embodiments of the present application are described in detail below.

[0059] Please refer to Figure 2 , Figure 2 The schematic diagram of the cooling mode of the air conditioning system according to the first embodiment of the present application is shown. When the air conditioning system 100 is in the cooling mode, the first valve port 21 and the third valve port 23 of the first reversing assembly 2 are connected, the second valve port 22 and the fourth valve port 24 are connected, the first port 51 and the third port 53 of the second reversing assembly 5 are connected, the first throttle valve 43 is throttled, the second throttle valve 44 is throttled, and the third throttle valve 81 is fully closed.

[0060] Refrigerant Flow: The high-temperature, high-pressure gaseous refrigerant discharged from the exhaust port 12 of the compressor 1 flows to the first reversing assembly 2 and the second reversing assembly 5, respectively. The refrigerant flowing to the first reversing assembly 2 flows into the first reversing assembly 2 through the first valve port 21 and exits the first reversing assembly 2 through the third valve port 23. The refrigerant exiting the third valve port 23 flows to the first portion 41, where it undergoes sufficient heat exchange and becomes a high-pressure, medium-temperature liquid refrigerant. The refrigerant exiting the first portion 41 then passes through the first throttle valve 43, where it undergoes throttling and pressure reduction, becoming a low-temperature, low-pressure two-phase refrigerant. The refrigerant flowing to the second reversing assembly 5 flows into the second reversing assembly 5 through the first port 51 and exits the second reversing assembly 5 through the third port 53. The refrigerant exiting the third port 53 flows to the second portion 42, where it undergoes sufficient heat exchange and becomes a high-pressure, medium-temperature liquid refrigerant. The refrigerant flowing out of the second portion 42 then passes through the second throttle valve 44 for throttling and pressure reduction, becoming a low-temperature, low-pressure two-phase refrigerant. The refrigerant throttled and pressure reduced by the first throttle valve 43 and the refrigerant throttled and pressure reduced by the second throttle valve 44 flow into the indoor heat exchanger 3, where they undergo heat exchange and become a low-temperature, low-pressure gaseous refrigerant. Finally, the refrigerant passes through the second valve port 22 and the fourth valve port 24, respectively, and flows back to the intake port 11 of the compressor 1, completing the refrigeration cycle of the air conditioning system 100.

[0061] See also Figure 3 , Figure 3 This is a schematic diagram of the heating mode of the air conditioning system provided by the first embodiment of the present application. When the air conditioning system 100 is in heating mode, the first valve port 21 of the first reversing assembly 2 is connected to the second valve port 22, the third valve port 23 is connected to the fourth valve port 24, the second port 52 of the second reversing assembly 5 is connected to the third port 53, the first throttle valve 43 is throttled, the second throttle valve 44 is throttled, the first on-off valve 61 is closed, and the third throttle valve 81 is fully closed.

[0062] The high-temperature and high-pressure gaseous refrigerant discharged from the discharge port 12 of the compressor 1 flows into the first reversing assembly 2 through the first valve port 21 and flows out of the first reversing assembly 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, and becomes high-pressure and medium-temperature liquid refrigerant after heat exchange in the indoor heat exchanger 3, and then flows out of the indoor heat exchanger 3 and flows to the first throttling valve 43 and the second throttling valve 44, respectively. The refrigerant throttled and depressurized by the first throttling valve 43 flows into the first part 41 and evaporates into low-temperature and low-pressure two-phase refrigerant in the first part 41. The refrigerant throttled and depressurized by the second throttling valve 44 flows into the second part 42 and evaporates into low-temperature and low-pressure two-phase refrigerant in the second part 42. Finally, the refrigerant flowing out of the second part 42 flows back to the suction port 11 of the compressor 1 through the third port 53 and the second port 52 in sequence, and the refrigerant flowing out of the first part 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24 in sequence, thereby completing the heating cycle of the air conditioning system 100.

[0063] Please refer to Figure 4 , Figure 4 The schematic diagram of defrosting the first part of the air conditioning system provided in the first embodiment of the present application is shown in FIG. 4. In some embodiments, when defrosting the first part 41, the first valve port 21 and the second valve port 22 of the first reversing assembly 2 are controlled to be conductive, the third valve port 23 and the fourth valve port 24 are controlled to be conductive, the third port 53 and the second port 52 of the second reversing assembly 5 are controlled to be conductive, the first throttling valve 43 is controlled to be fully closed, the second throttling valve 44 is controlled to be throttled, the first on-off valve 61 is controlled to be open, and the third throttling valve 81 is controlled to be fully closed.

[0064] The high-temperature and high-pressure gaseous refrigerant discharged from the discharge port 12 of the compressor 1 flows to the first reversing assembly 2 and the defrosting branch 6, respectively. The high-temperature and high-pressure gaseous refrigerant flowing to the defrosting branch 6 flows into the first part 41, and the sensible heat of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 is used to remove the frost of the first part 41. The refrigerant flowing to the first reversing assembly 2 flows into the first reversing assembly 2 through the first valve port 21 and flows out of the first reversing assembly 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, and becomes high-temperature and high-pressure two-phase refrigerant after heat exchange in the indoor heat exchanger 3, and then flows out of the indoor heat exchanger 3 and flows to the second throttling valve 44. The refrigerant throttled and depressurized by the second throttling valve 44 flows into the second part 42 and evaporates into low-temperature and low-pressure gaseous refrigerant in the second part 42, and then flows out of the second part 42. Finally, the refrigerant flowing out of the second part 42 flows back to the suction port 11 of the compressor 1 through the third port 53 and the second port 52 in sequence, and the refrigerant flowing out of the first part 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24 in sequence, thereby completing the defrosting refrigerant cycle of the first part 41.

[0065] In some embodiments, when defrosting the second portion 42, the first valve port 21 and the second valve port 22 of the first reversing assembly 2 are controlled to be in communication, the third valve port 23 and the fourth valve port 24 are controlled to be in communication, the first port 51 and the third port 53 of the second reversing assembly 5 are controlled to be in communication, the first throttling valve 43 is controlled to throttle, the second throttling valve 44 is controlled to be fully closed, the first on-off valve 61 is controlled to be closed, and the third throttling valve 81 is controlled to throttle.

[0066] The refrigerant flows as follows: the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port 12 of the compressor 1 flows to the first reversing assembly 2 and the defrost branch 6, respectively. The high-temperature and high-pressure gaseous refrigerant flowing to the defrost branch 6 flows into the first portion 41. The refrigerant flowing to the first reversing assembly 2 flows into the first reversing assembly 2 through the first valve port 21 and flows out of the first reversing assembly 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, becomes high-temperature and high-pressure two-phase refrigerant after heat exchange in the indoor heat exchanger 3, and then flows out of the indoor heat exchanger 3 to flow to the first throttling valve 43. The refrigerant throttled and depressurized by the first throttling valve 43 flows into the first portion 41. The high-temperature and high-pressure gaseous refrigerant flowing out of the defrost branch 6 and the low-temperature and low-pressure two-phase refrigerant throttled by the first throttling valve 43 flow into the first portion 41 to remove the frost on the first portion 41. The refrigerant flowing out of the first portion 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24, thereby completing the defrosting refrigerant circulation for the first portion 41.

[0067] Please refer to Figure 5 , Figure 5 The schematic diagram of the air conditioning system provided in the first embodiment of the present application for defrosting the second portion is shown in FIG. 4. When defrosting the second portion 42, the first valve port 21 and the second valve port 22 of the first reversing assembly 2 are controlled to be in communication, the third valve port 23 and the fourth valve port 24 are controlled to be in communication, the first port 51 and the third port 53 of the second reversing assembly 5 are controlled to be in communication, the first throttling valve 43 is controlled to throttle, the second throttling valve 44 is controlled to be fully closed, the first on-off valve 61 is controlled to be closed, and the third throttling valve 81 is controlled to throttle.

[0068] Refrigerant flow: The high-temperature and high-pressure gaseous refrigerant discharged from the discharge port 12 of the compressor 1 flows to the first reversing assembly 2 and the second reversing assembly 5, respectively. The refrigerant flowing to the first reversing assembly 2 flows into the first reversing assembly 2 through the first valve port 21 and flows out of the first reversing assembly 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, and the high-temperature and high-pressure gaseous refrigerant is heat-exchanged into high-temperature and high-pressure two-phase refrigerant in the indoor heat exchanger 3. After flowing out of the indoor heat exchanger 3, the refrigerant flows to the first throttling valve 43, is throttled and depressurized by the first throttling valve 43, and then flows to the first portion 41. The refrigerant flowing to the second reversing assembly 5 flows into the second reversing assembly 5 through the first port 51 and flows out of the second reversing assembly 5 from the third port 53. The refrigerant flowing out of the third port 53 flows to the second portion 42, so that the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 is cooled into high-pressure and medium-temperature liquid refrigerant in the second portion 42, and the latent heat of the refrigerant is used to defrost the second portion 42. The refrigerant flowing out of the second portion 42 flows to the bypass branch 8, then flows through the third throttling valve 81, is throttled and depressurized by the third throttling valve 81, and then flows to the first portion 41. Finally, the refrigerant flowing out of the first portion 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24, and thus the defrosting refrigerant circulation of the second portion 42 is completed.

[0069] Thus, when the first portion 41 is defrosted, the air conditioning system 100 defrosts the first portion 41 by bypassing part of the refrigerant from the discharge port 12 of the compressor 1 to the first portion 41, at this time, the second portion 42 can continue to ensure the heating cycle of the air conditioning system 100 as an evaporator, or the second portion 42 is closed, so that the refrigerant flowing out of the indoor heat exchanger 3 passes through the first portion 41, and then continues to ensure the heating cycle of the air conditioning system 100. When the second portion 42 is defrosted, the air conditioning system 100 can use the second reversing assembly 5 to reverse part of the refrigerant from the discharge port 12 of the compressor 1 to the second portion 42, and make the refrigerant cool to high-temperature medium-pressure gaseous refrigerant in the second portion 42, and make the refrigerant flowing out of the second portion 42 flow to the first portion 41, so that the latent heat of the refrigerant can be used to defrost the second portion 42, at this time, the first portion 41 can continue to ensure the heating cycle of the air conditioning system 100 as an evaporator. Thus, the first portion 41 and the second portion 42 can be defrosted in turn while ensuring the heating state of the indoor heat exchanger 3, which can avoid affecting the temperature in the room during defrosting of the air conditioning system 100, so that the room can maintain a high temperature, which is beneficial to improve the comfort of the user. Moreover, the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port 12 of the compressor 1 is used to defrost the first portion 41, and the defrosting effect is remarkable. The latent heat of the refrigerant is used to defrost the second portion 42, and the defrosting effect is remarkable. Thus, by using the defrosting mode combining low-pressure sensible heat and high-pressure waste heat, the advantages of waste heat defrosting and sensible heat defrosting can be utilized, while the problems of serious waste of waste heat defrosting capacity, poor reliability of sensible heat defrosting, and narrow applicable working conditions can be avoided, thereby improving the defrosting speed and reliability of the air conditioning system 100 to a certain extent. In addition, the bypass branch 8 is provided to connect the first portion 41 and the second portion 42, and the third throttling valve 81 is arranged on the bypass branch 8, which can eliminate the pressure loss at the second throttling valve 44 and improve the defrosting effect of the air conditioning system 100.

[0070] Please continue to refer to Figure 5 , the first portion 41 can be located directly above the second portion 42. Thus, the defrosting branch 6 can be reasonably arranged, which is beneficial to reduce the cost.

[0071] Please refer to Figure 6 , Figure 6 The first portion 41 can also be located directly below the second portion 42 for the air conditioning system provided by the second embodiment of the present application. Thus, the defrosting branch 6 can be reasonably arranged, which is beneficial to reduce the cost.

[0072] Please refer to Figure 5The first throttling valve 43, the second throttling valve 44 and the third throttling valve 81 can be electronic expansion valves. In this way, the operation speed and accuracy of the air conditioning system 100 can be improved. In other embodiments, the first throttling valve 43, the third throttling valve 81 and the second throttling valve 44 can also be thermal expansion valves.

[0073] In some embodiments, the first portion 41 and the second portion 42 can be divided into two independent heat exchangers. In this way, when one of the first portion 41 and the second portion 42 is damaged, the air conditioning system 100 can continue to operate, thereby improving the stability and reliability of the air conditioning system 100.

[0074] In other embodiments, the first portion 41 and the second portion 42 can also be divided into two portions of the same heat exchanger. In this way, the assembly of the air conditioning system 100 is facilitated, thereby improving the assembly efficiency of the air conditioning system 100.

[0075] In some embodiments, the first on-off valve 61 can be an electromagnetic valve. In this way, the response speed and reliability of the air conditioning system 100 can be improved. In other embodiments, the first on-off valve 61 can also be an electronic expansion valve.

[0076] Please continue to refer to Figure 5 The first end of the indoor heat exchanger 3 is connected to a first stop valve 31, and the second end of the indoor heat exchanger 3 is connected to a second stop valve 32. In this way, by providing the first stop valve 31 and the second stop valve 32, the air conditioning system 100 can be conveniently maintained and repaired. Specifically, when the indoor heat exchanger 3 needs to be repaired or replaced, the first stop valve 31 and the second stop valve 32 can be closed, so that the indoor heat exchanger 3 can be more conveniently repaired without the need to discharge the refrigerant of the entire air conditioning system 100.

[0077] For example, the air conditioning system 100 can be a multi-split system. The air conditioning system 100 includes a plurality of indoor units. Each indoor unit is provided with an indoor heat exchanger 3. The plurality of indoor units are connected in parallel. The first end of the indoor heat exchanger 3 of each indoor unit can be connected to the first stop valve 31. The second end of the indoor heat exchanger 3 of each indoor unit can be connected to the second stop valve 32. Of course, it can be understood that in other examples, the air conditioning system 100 can include only one indoor unit.

[0078] Please continue to refer to Figure 5In some embodiments, the air conditioning system 100 further includes a gas-liquid separator 7. The gas-liquid separator 7 is disposed between the compressor 1 and the first reversing assembly 2. The gas-liquid separator 7 has a liquid inlet 71 and a gas outlet 72. The liquid inlet 71 is connected to the fourth valve port 24. The gas outlet 72 is connected to the air intake 11. By providing the gas-liquid separator 7, the refrigerant entering the compressor 1 can be separated into gas and liquid, thereby avoiding liquid hammer problems in the compressor 1 and thus facilitating the protection of the compressor 1.

[0079] Please continue reading Figure 7 , Figure 7 A schematic diagram of the composition of an air conditioning system provided for the third embodiment of the present application. In some embodiments, the air conditioning system 100 further includes a heating device 73, which is used to heat the gas-liquid separator 7. This configuration can evaporate the liquid refrigerant accumulated in the gas-liquid separator 7 and increase the pressure and temperature of the gaseous refrigerant at the gas outlet 72 of the gas-liquid separator 7, thereby increasing the exhaust pressure and exhaust temperature of the compressor 1, thereby accelerating the defrosting speed of the air conditioning system 100. Exemplarily, the heating device 73 can be disposed at the bottom of the gas-liquid separator 7.

[0080] Please continue reading Figure 8 , Figure 8 A schematic diagram of the composition of an air-conditioning system provided for the fourth embodiment of the present application. The air-conditioning system 100 also includes a first subcooling device 46 and a second subcooling device 47. The first subcooling device 46 is connected between the first throttle valve 43 and the second end of the indoor heat exchanger 3, and the second subcooling device 47 is connected between the second throttle valve 44 and the second end of the indoor heat exchanger 3. In this way, the first part 41 can be isolated from the second part 42, thereby avoiding the problem of poor defrosting effect between the end of the first part 41 close to the second part 42 and the end of the second part 42 close to the first part 41 when the air-conditioning system 100 is defrosting, thereby improving the defrosting effect of the air-conditioning system 100. At the same time, it can also reduce the flash gas generated by the air-conditioning system 100 during the throttling process, which is beneficial to improving the cooling capacity of the air-conditioning system 100, and can also improve the stability of the operation of the compressor 1, thereby improving the stability and reliability of the air-conditioning system 100.

[0081] Please continue reading Figure 8 In some embodiments, an outdoor fan 45 may be provided on one side of the outdoor heat exchanger assembly 4. This arrangement can improve the heat exchange efficiency of the outdoor heat exchanger assembly 4.

[0082] Please continue reading Figure 8 In some embodiments, an indoor fan 33 may be provided on one side of the indoor heat exchanger 3. This arrangement can improve the heat exchange efficiency of the indoor heat exchanger 3.

[0083] Based on the structure of the air conditioning system 100, the defrosting method of the air conditioning system 100 of the embodiment of the application has four kinds. The first defrosting control method of the air conditioning system 100 of the embodiment of the application is described below.

[0084] Please refer to Figure 9 , Figure 9 The flow chart of the first defrosting control method of the air conditioning system provided by the embodiment of the application. The defrosting control method of the air conditioning system 100 includes the following steps:

[0085] S1: When the air conditioning system 100 operates in the heating mode, it is judged whether the air conditioning system 100 meets the defrosting condition. Wherein, when the air conditioning system 100 is in the heating mode, the first valve port 21 and the second valve port 22 of the first reversing component 2 are conductive, the third valve port 23 and the fourth valve port 24 are conductive, the second port 52 and the third port 53 of the second reversing component 5 are conductive, the first throttle valve 43 throttles, the second throttle valve 44 throttles, the first on-off valve 61 is closed, and the third throttle valve 81 is fully closed.

[0086] S2: If the air conditioning system 100 meets the defrosting condition, the first throttle valve 43 is fully closed, and the first on-off valve 61 is opened, so that the air conditioning system 100 operates in the first defrosting mode to defrost the first part 41.

[0087] Thus, in the first defrosting mode, the first valve port 21 and the second valve port 22 of the first reversing component 2 are conductive, the third valve port 23 and the fourth valve port 24 are conductive, the third port 53 and the second port 52 of the second reversing component 5 are conductive, the first throttle valve 43 is fully closed, the second throttle valve 44 throttles, the third throttle valve 81 is fully closed, and the first on-off valve 61 is opened. At this time, the flow direction of the refrigerant in the first defrosting mode can be: the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 12 of the compressor 1 flows to the first reversing component 2 and the defrosting branch 6 respectively, the high-temperature and high-pressure gaseous refrigerant flowing to the defrosting branch 6 flows into the first part 41, and the sensible heat of the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 1 is used to remove the frost of the first part 41. The refrigerant flowing to the first reversing component 2 flows into the first reversing component 2 through the first valve port 21 and flows out of the first reversing component 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, and becomes high-temperature and high-pressure two-phase refrigerant after heat exchange in the indoor heat exchanger 3, and then flows out of the indoor heat exchanger 3 to flow to the second throttle valve 44, and the refrigerant throttled and depressurized by the second throttle valve 44 flows into the second part 42 and evaporates into low-temperature and low-pressure gaseous refrigerant in the second part 42, and then flows out of the second part 42. Finally, the refrigerant flowing out of the second part 42 flows back to the suction port 11 of the compressor 1 through the third port 53 and the second port 52 in turn, and the refrigerant flowing out of the first part 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24 in turn.

[0088] S3: determining whether the air conditioning system 100 meets the first defrost mode end condition;

[0089] S4: if the air conditioning system 100 meets the first defrost mode end condition, controlling the first port 51 and the third port 53 of the second reversing assembly 5 to be conductive, controlling the first throttling valve 43 to throttle, controlling the second throttling valve 44 to be fully closed, controlling the first on-off valve 61 to be closed, and controlling the third throttling valve 81 to throttle, so as to control the air conditioning system 100 to exit the first defrost mode and run the second defrost mode, in which the second part 42 is defrosted.

[0090] Thus, in the second defrost mode, the first valve port 21 and the second valve port 22 of the first reversing assembly 2 are kept conductive, the third valve port 23 and the fourth valve port 24 are kept conductive, the first port 51 and the third port 53 of the second reversing assembly 5 are controlled to be conductive, the first throttling valve 43 is controlled to throttle, the second throttling valve 44 is controlled to be fully closed, the third throttling valve 81 is controlled to throttle, and the first on-off valve 61 is controlled to be closed. At this time, the flow direction of the refrigerant in the second defrost mode can be that the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port 12 of the compressor 1 flows to the first reversing assembly 2 and the second reversing assembly 5 respectively. The refrigerant flowing to the first reversing assembly 2 flows into the first reversing assembly 2 through the first valve port 21 and flows out of the first reversing assembly 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, and the high-temperature and high-pressure gaseous refrigerant is heat-exchanged into high-temperature and high-pressure two-phase refrigerant in the indoor heat exchanger 3. After flowing out of the indoor heat exchanger 3, the refrigerant flows to the first throttling valve 43, throttles and depressurizes through the first throttling valve 43, and then flows to the first part 41. The refrigerant flowing to the second reversing assembly 5 flows into the second reversing assembly 5 through the first port 51 and flows out of the second reversing assembly 5 from the third port 53. The refrigerant flowing out of the third port 53 flows to the second part 42, so that the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 is cooled into high-pressure and medium-temperature liquid refrigerant in the second part 42, and the second part 42 is defrosted by using the latent heat of the refrigerant. The refrigerant flowing out of the second part 42 flows to the bypass branch 8, and then flows through the third throttling valve 81, throttles and depressurizes through the third throttling valve 81, and then flows to the first part 41. Finally, the refrigerant flowing out of the first part 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24.

[0091] S5: determining whether the air conditioning system 100 meets the second defrost mode end condition;

[0092] S6: if the second defrost mode end condition is met, controlling the second port 52 and the third port 53 of the second reversing assembly 5 to be conductive, and controlling the second throttling valve 44 to throttle, so as to exit the second defrost mode and run the heating mode.

[0093] Therefore, when switching from the heating mode to the first defrosting mode and the second defrosting mode for defrosting the first portion 41 and the second portion 42, the first reversing component 2 is always not reversed, the power consumption of the air conditioning system 100 can be reduced, the air conditioning system 100 can realize uninterrupted heating, the indoor can always be kept in a high temperature state, and the user's comfort can be improved. At the same time, the first defrosting mode uses the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 12 of the compressor 1 to defrost the first portion 41, and the defrosting effect is remarkable. The second defrosting mode uses the second reversing component 5 to reverse a part of the refrigerant bypassing the exhaust port 12 of the compressor 1 to the second portion 42, and makes the refrigerant cool to high-temperature and medium-pressure gaseous refrigerant in the second portion 42, and makes the refrigerant flowing out of the second portion 42 flow to the first portion 41, so that the latent heat of the refrigerant can be used to defrost the second portion 42. Through the defrosting mode combining low-pressure sensible heat and high-pressure waste heat, not only can the advantages of waste heat defrosting and sensible heat defrosting be utilized, but also the problems of serious waste of waste heat defrosting capacity, poor reliability of sensible heat defrosting, and narrow applicable working conditions can be avoided, which is beneficial to improve the reliability and stability of the air conditioning system 100.

[0094] In some embodiments, the first portion 41 is located directly above the second portion 42, the first portion 41 is defrosted in the first defrosting mode, and the second portion 42 is defrosted in the second defrosting mode. Therefore, when the first portion 41 is located directly above the second portion 42, during the defrosting process of the outdoor heat exchanger assembly 4, the first portion 41 is defrosted first, and then the second portion 42 is defrosted after the defrosting of the first portion 41 is completed, which is beneficial to ensure the defrosting effect of the outdoor heat exchanger assembly 4 and prevent the problem that when the first portion 41 is defrosted first and then the second portion 42 is defrosted, the defrosting water of the first portion 41 falls on the second portion 42 as an evaporator, which causes the second portion 42 to freeze and the defrosting effect of the second portion 42 to be poor.

[0095] In some embodiments, in order to improve the evaporation capacity of the first portion 41, the outdoor fan 45 is arranged on the side of the first portion 41 away from the second portion 42, and in step S4, if the air conditioning system 100 meets the first defrosting mode ending condition, the outdoor fan 45 is turned on, so that air can be supplied to the first portion 41 during the defrosting of the second portion 42. In this way, after the defrosting of the first portion 41 is completed, the outdoor fan 45 is turned on to improve the evaporation capacity of the first portion 41, and then the suction pressure of the compressor 1 can be improved, so that the indoor side can quickly blow air after the defrosting of the air conditioning system 100 is completed, which is beneficial to improve the user's experience.

[0096] In some embodiments, the outdoor environment temperature Ta, the temperature Te1 of the second end of the first part 41, and the temperature Tg2 of the second end of the second part 42 are obtained before it is determined that the air conditioning system 100 meets the defrosting condition. If Ta≤a, Te1 / Tg2≤b, and the continuous operation time of the air conditioning system 100 in the heating mode reaches the first set time length, it is determined that the air conditioning system meets the defrosting condition. In this way, the air conditioning system 100 can accurately determine whether to defrost, which is conducive to improving the sensitivity and reliability of the defrosting of the air conditioning system 100.

[0097] For example, an outdoor temperature sensor can be arranged on the outside of the air conditioning system 100 to obtain the outdoor environment temperature Ta, a first part temperature sensor can be arranged at the second end of the first part 41 to obtain the temperature Te1 of the second end of the first part 41, and a second part temperature sensor 421 can be arranged at the second end of the second part 42 to obtain the temperature Tg2 of the second end of the second part 42.

[0098] In some embodiments, -7℃≤a≤7℃. For example, the threshold value a of the outdoor environment temperature Ta can be -6℃, -5℃, -4℃, -3℃, -2℃, -1℃, 0℃, 1℃, 2℃, 3℃, 4℃, 5℃, or 6℃, etc.

[0099] In some embodiments, -5℃≤b≤0℃. For example, the ratio Te1 / Tg2 can be -5℃, -4℃, -3℃, -2℃, -1℃, or 0℃, etc.

[0100] In some embodiments, the first set time length≥10min. For example, the first set time length can be 10min, 11min, 12min, 13min, or 14min, etc.

[0101] In some embodiments, the first defrosting mode end condition is that the temperature Tg1 of the first end of the first part 41≥Tgo1 and lasts for a first preset time. In this way, the first defrosting mode can be exited in time when the first defrosting mode end condition is met, which is conducive to improving the intelligent degree and reliability of the air conditioning system 100.

[0102] For example, in the above-mentioned embodiments, the first part temperature sensor 411 can be arranged at the first end of the first part 41 to obtain the temperature Tg1 of the first end of the first part 41. Figure 8

[0103] In some embodiments, the second defrosting mode end condition is that the temperature Tg2 of the second end of the second part 42≥Tgo2 and lasts for a second preset time. In this way, the second defrosting mode can be exited in time when the second defrosting mode end condition is met, which is conducive to improving the intelligent degree and reliability of the air conditioning system 100.​

[0104] In some embodiments, 10℃≤Tgo1≤25℃. For example, Tgo1 can be 10℃, 11℃, 12℃, 13℃, 14℃, 15℃, 16℃, 17℃, 18℃, 19℃, 20℃, 21℃, 22℃, 23℃, 24℃, or 25℃, etc.

[0105] In some embodiments, 5 seconds≤first preset time≤30 seconds. For example, the first preset time can be 5 seconds, 10 seconds, 15 seconds, 20 seconds, 25 seconds, or 30 seconds, etc.

[0106] In some embodiments, 10℃≤Tgo2≤25℃. For example, Tgo2 can be 10℃, 11℃, 12℃, 13℃, 14℃, 15℃, 16℃, 17℃, 18℃, 19℃, 20℃, 21℃, 22℃, 23℃, 24℃, or 25℃, etc.

[0107] In some embodiments, 5 seconds≤second preset time≤30 seconds. For example, the second preset time can be 5 seconds, 10 seconds, 15 seconds, 20 seconds, 25 seconds, or 30 seconds, etc.

[0108] The second defrosting control method of the air conditioning system 100 according to the embodiments of the present application is described below. The second defrosting control method is a defrosting control method of the air conditioning system 100 based on the first part 41 being located directly above the second part 42.

[0109] Please refer to Figure 10 , Figure 10 The flow chart of the second defrosting control method of the air conditioning system according to the embodiments of the present application is provided. The defrosting control method of the air conditioning system 100 includes the following steps:

[0110] S1: When the air conditioning system 100 operates in the heating mode, it is determined whether the air conditioning system 100 meets the defrosting condition. When the air conditioning system 100 is in the heating mode, the first valve port 21 and the second valve port 22 of the first reversing component 2 are conductive, the third valve port 23 and the fourth valve port 24 are conductive, the second port 52 and the third port 53 of the second reversing component 5 are conductive, the first throttle valve 43 is throttled, the second throttle valve 44 is throttled, the first on-off valve 61 is closed, and the third throttle valve 81 is fully closed.

[0111] S2: If the air conditioning system 100 meets the defrosting condition, the second throttle valve 44 is fully closed, and the first on-off valve 61 is opened, so that the air conditioning system 100 operates in the first defrosting mode and defrosts the first part 41.

[0112] Thus, in the first defrosting mode, the first valve port 21 and the second valve port 22 of the first reversing assembly 2 are kept open, the third valve port 23 and the fourth valve port 24 are kept open, the second port 52 and the third port 53 of the second reversing assembly 5 are kept open, the first throttle valve 43 is throttled, the second throttle valve 44 is fully closed, the third throttle valve 81 is fully closed, and the first on-off valve 61 is opened. At this time, the flow direction of the refrigerant in the first defrosting mode can be: the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port 12 of the compressor 1 flows to the first reversing assembly 2 and the defrosting branch 6 respectively, the high-temperature and high-pressure gaseous refrigerant flowing to the defrosting branch 6 flows into the first part 41. The refrigerant flowing to the first reversing assembly 2 flows into the first reversing assembly 2 through the first valve port 21 and flows out of the first reversing assembly 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, becomes high-temperature and high-pressure two-phase refrigerant after heat exchange in the indoor heat exchanger 3, and then flows out of the indoor heat exchanger 3 to the first throttle valve 43, and the refrigerant throttled and depressurized by the first throttle valve 43 flows into the first part 41. The high-temperature and high-pressure gaseous refrigerant flowing out of the defrosting branch 6 and the low-temperature and low-pressure two-phase refrigerant throttled by the first throttle valve 43 flow into the first part 41 to remove the frost on the first part 41. The refrigerant flowing out of the first part 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24.

[0113] S3: determining whether the air conditioning system 100 meets the first defrosting mode end condition;

[0114] S4: if the air conditioning system 100 meets the first defrosting mode end condition, controlling the first port 51 and the third port 53 to be open, the first throttle valve 43 to be throttled, the second throttle valve 44 to be fully closed, the first on-off valve 61 to be closed, and the third throttle valve 81 to be throttled, so as to control the air conditioning system 100 to exit the first defrosting mode and run in the second defrosting mode, in which the second part 42 is defrosted.

[0115] Thus, in the second defrosting mode, the first valve port 21 and the second valve port 22 of the first switching assembly 2 are kept open, the third valve port 23 and the fourth valve port 24 are kept open, the first port 51 and the third port 53 of the second switching assembly 5 are kept open, the first throttle valve 43 is throttled, the second throttle valve 44 is closed, the third throttle valve 81 is throttled, and the first on-off valve 61 is closed. At this time, the flow direction of the refrigerant in the second defrosting mode can be: the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port 12 of the compressor 1 flows to the first switching assembly 2 and the second switching assembly 5 respectively. The refrigerant flowing to the first switching assembly 2 flows into the first switching assembly 2 through the first valve port 21 and flows out of the first switching assembly 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, and the high-temperature and high-pressure gaseous refrigerant is heat-exchanged into high-temperature and high-pressure two-phase refrigerant in the indoor heat exchanger 3. After flowing out of the indoor heat exchanger 3, it flows to the first throttle valve 43, is throttled and depressurized by the first throttle valve 43, and then flows to the first part 41. The refrigerant flowing to the second switching assembly 5 flows into the second switching assembly 5 through the first port 51 and flows out of the second switching assembly 5 from the third port 53. The refrigerant flowing out of the third port 53 flows to the second part 42, so that the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 is cooled into high-pressure and medium-temperature liquid refrigerant in the second part 42, and the second part 42 is defrosted by using the latent heat of the refrigerant. The refrigerant flowing out of the second part 42 flows to the bypass branch 8, and then flows through the third throttle valve 81, is throttled and depressurized by the third throttle valve 81, and then flows to the first part 41. Finally, the refrigerant flowing out of the first part 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24.

[0116] S5: determining whether the air conditioning system 100 meets the second defrosting mode end condition;

[0117] S6: if the second defrosting mode end condition is met, the second port 52 and the third port 53 of the second switching assembly 5 are kept open, and the second throttle valve 44 is throttled, so as to exit the second defrosting mode and run the heating mode.

[0118] Therefore, when switching from the heating mode to the first defrosting mode and the second defrosting mode for defrosting the first portion 41 and the second portion 42, the first reversing component 2 is always not reversed, the power consumption of the air conditioning system 100 can be reduced, the air conditioning system 100 can realize uninterrupted heating, the indoor can always be kept in a high temperature state, and the user's comfort can be improved. In the second defrosting mode, the second reversing component 5 reverses part of the refrigerant in the exhaust port 12 of the bypass compressor 1 to the second portion 42, and the refrigerant is cooled to high-temperature medium-pressure gaseous refrigerant in the second portion 42, and the refrigerant flowing out of the second portion 42 can flow to the first portion 41, so that the latent heat of the refrigerant can be used to defrost the second portion 42. Through the defrosting mode combining low-pressure sensible heat and high-pressure waste heat, not only can the advantages of waste heat defrosting and sensible heat defrosting be utilized, but also the problems of serious waste of waste heat defrosting capacity, poor reliability of sensible heat defrosting, and narrow applicable working conditions can be avoided, which is beneficial to improve the reliability and stability of the air conditioning system 100. Moreover, since the first portion 41 is located directly above the second portion 42, when defrosting the first portion 41, the second portion 42 is not used as an evaporator by fully closing the second throttling valve 44, so that the problem of ice formation on the second portion 42 caused by the defrosting water of the first portion 41 falling on the second portion 42 when the second portion 42 is used as an evaporator during the defrosting process of the first portion 41 can be avoided.

[0119] In some embodiments, in the first defrosting mode, the first portion 41 is defrosted, and in the second defrosting mode, the second portion 42 is defrosted. Therefore, since the first portion 41 is located directly above the second portion 42, during the defrosting process of the outdoor heat exchanger assembly 4, by defrosting the first portion 41 first and then defrosting the second portion 42 after the defrosting of the first portion 41 is completed, the defrosting effect of the outdoor heat exchanger assembly 4 can be ensured, and the problem that the second portion 42 will freeze when the defrosting water of the first portion 41 falls on the second portion 42 used as an evaporator after defrosting the second portion 42 first and then defrosting the first portion 41 can be prevented.

[0120] In some embodiments, in order to improve the evaporation capacity of the first portion 41, the outdoor fan 45 is arranged on the side of the first portion 41 away from the second portion 42, and in step S4, if the air conditioning system 100 meets the first defrosting mode ending condition, the outdoor fan 45 is turned on, so that air can be supplied to the first portion 41 during the defrosting process of the second portion 42. In this way, after the defrosting of the first portion 41 is completed, the outdoor fan 45 is turned on to improve the evaporation capacity of the first portion 41, and then the suction pressure of the compressor 1 can be improved, so that the indoor side can quickly blow air after the defrosting of the air conditioning system 100 is completed, and the user's use experience can be improved.

[0121] In some embodiments, the outdoor environment temperature Ta, the temperature Te1 of the second end of the first portion 41 and the temperature Tg2 of the second end of the second portion 42 are obtained before determining whether the air conditioning system 100 meets the defrosting condition. If Ta≤a, Te1 / Tg2≤b, and the continuous running time of the air conditioning system 100 in the heating mode reaches the first set time length, it is determined that the air conditioning system meets the defrosting condition. Thus, the air conditioning system 100 can accurately determine whether to defrost, which is conducive to improving the sensitivity and reliability of the defrosting of the air conditioning system 100.

[0122] For example, an outdoor temperature sensor can be arranged on the outside of the air conditioning system 100 to obtain the outdoor environment temperature Ta, a first portion temperature sensor can be arranged at the second end of the first portion 41 to obtain the temperature Te1 of the second end of the first portion 41, and a second portion temperature sensor 421 can be arranged at the second end of the second portion 42 to obtain the temperature Tg2 of the second end of the second portion 42.

[0123] In some embodiments, -7℃<a<7℃. For example, the threshold value a of the outdoor environment temperature Ta can be -6℃, -5℃, -4℃, -3℃, -2℃, -1℃, 0℃, 1℃, 2℃, 3℃, 4℃, 5℃ or 6℃, etc.

[0124] In some embodiments, -5℃≤b≤0℃. For example, the ratio of Te1 / Tg2 can be -5℃, -4℃, -3℃, -2℃, -1℃ or 0℃, etc.

[0125] In some embodiments, the first set time length≥10min. For example, the first set time length can be 10min, 11min, 12min, 13min or 14min, etc.

[0126] In some embodiments, the first defrosting mode end condition is that the temperature Tg1 of the first end of the first portion 41≥Tgo1 and lasts for a first preset time. Thus, the first defrosting mode can be exited in time when the first defrosting mode end condition is met, which is conducive to improving the intelligent degree and reliability of the air conditioning system 100.

[0127] For example, in the first defrosting mode, the temperature Tg1 of the first end of the first portion 41 is controlled to be lower than Tgo1, and the temperature Te1 of the second end of the first portion 41 is controlled to be higher than Tgo2. Figure 8 In the above embodiments, a first portion temperature sensor 411 can be arranged at the first end of the first portion 41 to obtain the temperature Tg1 of the first end of the first portion 41. An outdoor temperature sensor can be arranged on the outside of the air conditioning system 100 to obtain the outdoor environment temperature Ta, a first portion Te temperature sensor can be arranged at the second end of the first portion 41 to obtain the temperature Te1 of the second end of the first portion 41, and a second portion temperature sensor 421 can be arranged at the second end of the second portion 42 to obtain the temperature Tg2 of the second end of the second portion 42.

[0128] In some embodiments, the second defrosting mode end condition is that the temperature Tg2 of the second end of the second portion 42 ≥ Tgo2 and lasts for a second preset time. In this way, the second defrosting mode can be exited in time when the second defrosting mode end condition is met, thereby facilitating to improve the intelligent degree and reliability of the air conditioning system 100.

[0129] In some embodiments, 10℃ ≤ Tgo1 ≤ 25℃. For example, Tgo1 can be 10℃, 11℃, 12℃, 13℃, 14℃, 15℃, 16℃, 17℃, 18℃, 19℃, 20℃, 21℃, 22℃, 23℃, 24℃ or 25℃, etc.

[0130] In some embodiments, 5 seconds ≤ the first preset time ≤ 30 seconds. For example, the first preset time can be 5 seconds, 10 seconds, 15 seconds, 20 seconds, 25 seconds or 30 seconds, etc.

[0131] In some embodiments, 10℃ ≤ Tgo2 ≤ 25℃. For example, Tgo2 can be 10℃, 11℃, 12℃, 13℃, 14℃, 15℃, 16℃, 17℃, 18℃, 19℃, 20℃, 21℃, 22℃, 23℃, 24℃ or 25℃, etc.

[0132] In some embodiments, 5 seconds ≤ the second preset time ≤ 30 seconds. For example, the first preset time can be 5 seconds, 10 seconds, 15 seconds, 20 seconds, 25 seconds or 30 seconds, etc.

[0133] The third defrosting control method of the air conditioning system 100 of the embodiments of the present application is described below.

[0134] Please refer to Figure 11 , Figure 11 The flow chart of the third defrosting control method of the air conditioning system provided by the embodiments of the present application is shown in FIG. 6. The defrosting control method of the air conditioning system 100 includes the following steps:

[0135] S1: When the air conditioning system 100 is running in the heating mode, it is judged whether the air conditioning system 100 meets the defrosting condition. Wherein, when the air conditioning system 100 is in the heating mode, the first valve port 21 and the second valve port 22 of the first reversing component 2 are conductive, the third valve port 23 and the fourth valve port 24 are conductive, the second end port 52 and the third end port 53 of the second reversing component 5 are conductive, the first throttling valve 43 is throttled, the second throttling valve 44 is throttled, the first on-off valve 61 is closed, and the third throttling valve 81 is fully closed.

[0136] S2: If the air conditioning system 100 meets the defrosting condition, the first port 51 and the third port 53 of the second reversing component 5 are controlled to be conductive, the second throttle valve 44 is fully closed, and the third throttle valve 81 is throttled, so that the air conditioning system 100 operates in the first defrosting mode to defrost the second part 42.

[0137] Thus, in the first defrosting mode, the first valve port 21 and the second valve port 22 of the first reversing component 2 are kept conductive, the third valve port 23 and the fourth valve port 24 are kept conductive, the first port 51 and the third port 53 of the second reversing component 5 are controlled to be conductive, the first throttle valve 43 is controlled to be throttled, the second throttle valve 44 is fully closed, the third throttle valve 81 is throttled, and the first on-off valve 61 is closed. At this time, the flow direction of the refrigerant in the first defrosting mode can be: the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 12 of the compressor 1 flows to the first reversing component 2 and the second reversing component 5, respectively. The refrigerant flowing to the first reversing component 2 flows into the first reversing component 2 through the first valve port 21 and flows out of the first reversing component 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, and the high-temperature and high-pressure gaseous refrigerant is heat-exchanged into high-temperature and high-pressure two-phase refrigerant in the indoor heat exchanger 3. After flowing out of the indoor heat exchanger 3, it flows to the first throttle valve 43, is throttled and reduced in pressure by the first throttle valve 43, and then flows to the first part 41. The refrigerant flowing to the second reversing component 5 flows into the second reversing component 5 through the first port 51 and flows out of the second reversing component 5 from the third port 53. The refrigerant flowing out of the third port 53 flows to the second part 42, so that the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 is cooled to high-pressure and medium-temperature liquid refrigerant in the second part 42, and the latent heat of the refrigerant is used to defrost the second part 42. The refrigerant flowing out of the second part 42 flows to the bypass branch 8, then flows through the third throttle valve 81, is throttled and reduced in pressure by the third throttle valve 81, and then flows to the first part 41. Finally, the refrigerant flowing out of the first part 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24.

[0138] S3: Determine whether the air conditioning system 100 meets the first defrosting mode end condition;

[0139] S4: If the air conditioning system 100 meets the first defrosting mode end condition, the third port 53 and the second port 52 of the second reversing component 5 are controlled to be conductive, the first throttle valve 43 is fully closed, the second throttle valve 44 is throttled, the third throttle valve 81 is fully closed, and the first on-off valve 61 is opened to control the air conditioning system 100 to exit the first defrosting mode and operate in the second defrosting mode to defrost the first part 41.

[0140] Thus, in the second defrosting mode, the first valve port 21 and the second valve port 22 of the first reversing assembly 2 are kept open, the third valve port 23 and the fourth valve port 24 are kept open, the third port 53 and the second port 52 of the second reversing assembly 5 are kept open, the first throttling valve 43 is kept closed, the second throttling valve 44 is throttled, the third throttling valve 81 is kept closed, and the first on-off valve 61 is opened. At this time, the flow direction of the refrigerant in the second defrosting mode can be as follows: the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port 12 of the compressor 1 flows to the first reversing assembly 2 and the defrosting branch 6, respectively, the high-temperature and high-pressure gaseous refrigerant flowing to the defrosting branch 6 flows into the first part 41, and the sensible heat of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 is used to remove the frost on the first part 41. The refrigerant flowing to the first reversing assembly 2 flows into the first reversing assembly 2 through the first valve port 21 and flows out of the first reversing assembly 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, exchanges heat in the indoor heat exchanger 3, and becomes high-temperature and high-pressure two-phase refrigerant, then flows out of the indoor heat exchanger 3 and flows to the second throttling valve 44, the refrigerant throttled and depressurized by the second throttling valve 44 flows into the second part 42 and evaporates into low-temperature and low-pressure gaseous refrigerant in the second part 42, and then flows out of the second part 42. Finally, the refrigerant flowing out of the second part 42 flows back to the suction port 11 of the compressor 1 through the third port 53 and the second port 52 in sequence, and the refrigerant flowing out of the first part 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24 in sequence.

[0141] S5: determining whether the second defrosting mode end condition is met;

[0142] S6: if the second defrosting mode end condition is met, throttling the first throttling valve 43 and closing the first on-off valve 61 to exit the second defrosting mode and run the heating mode.

[0143] The technical effects and end conditions of this method are similar to those of the first defrosting control method described above, which will not be repeated here.

[0144] The fourth defrosting control method of the air conditioning system 100 according to the present application will be described below.

[0145] Please refer to Figure 12 , Figure 12 The flow chart of the fourth defrosting control method of the air conditioning system according to the present application is provided. The fourth defrosting control method is based on the air conditioning system 100 in which the first part 41 is located directly above the second part 42. The defrosting control method of the air conditioning system 100 includes the following steps:

[0146] S1: When the air conditioning system 100 is running in the heating mode, it is determined whether the air conditioning system 100 meets the defrosting condition. When the air conditioning system 100 is in the heating mode, the first valve port 21 and the second valve port 22 of the first reversing component 2 are in conduction, the third valve port 23 and the fourth valve port 24 are in conduction, the second port 52 and the third port 53 of the second reversing component 5 are in conduction, the first throttling valve 43 throttles, the second throttling valve 44 throttles, the first on-off valve 61 is closed, and the third throttling valve 81 is fully closed.

[0147] S2: If the air conditioning system 100 meets the defrosting condition, the first port 51 and the third port 53 of the second reversing component 5 are controlled to be in conduction, the second throttling valve 44 is fully closed, and the third throttling valve 81 throttles, so that the air conditioning system 100 runs in the first defrosting mode to defrost the second part 42.

[0148] Thus, in the first defrosting mode, the first valve port 21 and the second valve port 22 of the first reversing component 2 are kept in conduction, the third valve port 23 and the fourth valve port 24 are kept in conduction, the first port 51 and the third port 53 of the second reversing component 5 are controlled to be in conduction, the first throttling valve 43 is controlled to throttle, the second throttling valve 44 is controlled to be fully closed, the third throttling valve 81 is controlled to throttle, and the first on-off valve 61 is closed. At this time, the flow direction of the refrigerant in the first defrosting mode can be: the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 12 of the compressor 1 flows to the first reversing component 2 and the second reversing component 5 respectively. The refrigerant flowing to the first reversing component 2 flows into the first reversing component 2 through the first valve port 21 and flows out of the first reversing component 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, and the high-temperature and high-pressure gaseous refrigerant is heat-exchanged into high-temperature and high-pressure two-phase refrigerant in the indoor heat exchanger 3. After flowing out of the indoor heat exchanger 3, it flows to the first throttling valve 43, throttles and depressurizes after passing through the first throttling valve 43, and then flows to the first part 41. The refrigerant flowing to the second reversing component 5 flows into the second reversing component 5 through the first port 51 and flows out of the second reversing component 5 from the third port 53. The refrigerant flowing out of the third port 53 flows to the second part 42, so that the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 is cooled to high-pressure and medium-temperature liquid refrigerant in the second part 42, and the latent heat of the refrigerant is used to defrost the second part 42. The refrigerant flowing out of the second part 42 flows to the bypass branch 8, then flows through the third throttling valve 81, throttles and depressurizes after passing through the third throttling valve 81, and then flows to the first part 41. Finally, the refrigerant flowing out of the first part 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24.

[0149] S3: It is determined whether the air conditioning system 100 meets the first defrosting mode end condition;

[0150] S4: If the air conditioning system 100 meets the first defrost mode end condition, the second port 52 of the second reversing component 5 is controlled to be conductive with the third port 53, the third throttle valve 81 is controlled to be fully closed, and the first on-off valve 61 is controlled to be opened, so as to control the air conditioning system 100 to exit the first defrost mode and run the second defrost mode, in which the first part 41 is defrosted.

[0151] Thus, in the second defrost mode, the first valve port 21 and the second valve port 22 of the first reversing component 2 are kept conductive, the third valve port 23 and the fourth valve port 24 are kept conductive, the second port 52 of the second reversing component 5 is kept conductive with the third port 53, the first throttle valve 43 is throttled, the second throttle valve 44 is fully closed, the third throttle valve 81 is fully closed, and the first on-off valve 61 is opened. At this time, the flow direction of the refrigerant in the second defrost mode can be: the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 12 of the compressor 1 flows to the first reversing component 2 and the defrost branch 6 respectively, and the high-temperature and high-pressure gaseous refrigerant flowing to the defrost branch 6 flows into the first part 41. The refrigerant flowing to the first reversing component 2 flows into the first reversing component 2 through the first valve port 21 and flows out of the first reversing component 2 from the second valve port 22. The refrigerant flowing out of the second valve port 22 flows to the indoor heat exchanger 3, becomes high-temperature and high-pressure two-phase refrigerant after heat exchange in the indoor heat exchanger 3, and then flows out of the indoor heat exchanger 3 to flow to the first throttle valve 43. The high-temperature and high-pressure gaseous refrigerant flowing out of the defrost branch 6 and the low-temperature and low-pressure two-phase refrigerant throttled by the first throttle valve 43 flow into the first part 41 to remove the frost on the first part 41. The refrigerant flowing out of the first part 41 flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24.

[0152] S5: It is judged whether the air conditioning system 100 meets the second defrost mode end condition.

[0153] S6: If the second defrost mode end condition is met, the second throttle valve 44 is controlled to be throttled, and the first on-off valve 61 is controlled to be closed, so as to exit the second defrost mode and run the heating mode.

[0154] The technical effects and end conditions of this method are similar to those of the second defrost control method described above, which will not be described here.

[0155] Please refer to Figure 13 , Figure 13 The flow chart of the fifth defrost control method of the air conditioning system provided in the embodiment of the present application. The step S6 of the defrost control method of the air conditioning system 100 described above specifically includes the following steps:

[0156] S61: After the air conditioning system 100 exits the second defrosting mode, the air conditioning system 100 is controlled to run the heating start-up mode. In the heating start-up mode, the second port 52 and the third port 53 are controlled to be in communication; the first throttling valve 43 is throttled, the second throttling valve 44 is throttled, the third throttling valve 81 is fully closed, the first on-off valve 61 is closed, and the heating device 73 is turned on.

[0157] Thus, in the heating start-up mode, the second port 52 and the third port 53 are kept in communication; the first throttling valve 43 is throttled, the second throttling valve 44 is throttled, the first on-off valve 61 is closed, and the heating device 73 is turned on.

[0158] S62: It is judged whether the air conditioning system 100 meets the heating start-up mode end condition.

[0159] S63: If the air conditioning system 100 meets the heating start-up mode end condition, the heating device 73 is controlled to be turned off, so as to control the air conditioning system 100 to exit the heating start-up mode and run the heating mode.

[0160] Thus, by heating the gas-liquid separator 7 through the heating device 73, the liquid refrigerant accumulated in the gas-liquid separator 7 can be evaporated, so as to increase the pressure and temperature of the gaseous refrigerant at the gas outlet 72 of the gas-liquid separator 7, and further increase the discharge pressure and temperature of the compressor 1, so as to improve the start-up high-low pressure differential establishment speed after the air conditioning system 100 exits the second defrosting mode, thereby avoiding affecting the heating cycle capacity of the air conditioning system 100, and being beneficial to improving the heating capacity of the air conditioning system 100.

[0161] In some embodiments, the exit condition of the heating start-up mode is that the temperature Tg3 of the indoor heat exchanger is greater than or equal to Tgo3 and lasts for a third preset time. Thus, the heating start-up mode can be exited in time when the exit condition of the heating start-up mode is met, thereby being beneficial to improving the intelligent degree and reliability of the air conditioning system.

[0162] In some embodiments, the air conditioning system 100 further comprises an indoor fan 33, which can be located on one side of the indoor heat exchanger 3. In the first defrosting mode and the second defrosting mode, the indoor fan 33 can be turned off. Such a design is beneficial to improving the defrosting effect of the air conditioning system 100.

[0163] In some embodiments, 10℃≤Tgo3≤40℃. For example, Tgo3 can be 10℃, 11℃, 12℃, 13℃, 14℃, 15℃, 16℃, 20℃, 25℃, 30℃, 35℃, or 40℃, etc.

[0164] In some embodiments, 5 seconds ≤ the third preset time ≤ 30 seconds. For example, the third preset time can be 5 seconds, 10 seconds, 15 seconds, 20 seconds, 25 seconds, or 30 seconds, etc.

[0165] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0166] The above description is merely specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioning system, characterized by, Compressor having a suction port and a discharge port; A first reversing assembly having first to fourth valve ports, the first valve port being connected to the discharge port, the fourth valve port being connected to the suction port, the first valve port being reversibly connected to one of the second valve port and the third valve port, the fourth valve port being reversibly connected to the other of the second valve port and the third valve port; A second reversing assembly having first to third ports, the first port being connected to the discharge port, the second port being connected to the suction port, the third port being reversibly connected to one of the first port and the second port; An indoor heat exchanger, a first end of the indoor heat exchanger being connected to the second valve port; An outdoor heat exchanger assembly including a first part and a second part, a first end of the first part being connected to the third valve port, a first end of the second part being connected to the third port, a second end of the first part being connected to a second end of the indoor heat exchanger through a first throttling valve, a second end of the second part being connected to the second end of the indoor heat exchanger through a second throttling valve; A defrost branch, a first end of the defrost branch being connected to the discharge port, a second end of the defrost branch being connected to a pipeline between the first throttling valve and the second end of the first part, a first on-off valve being connected in series to the defrost branch; A bypass branch, a first end of the bypass branch being connected to a pipeline between the first throttling valve and the second end of the first part, a second end of the bypass branch being connected to a pipeline between the second throttling valve and the second end of the second part, a third throttling valve being connected in series to the bypass branch. The first part is located directly above the second part, or the first part is located directly below the second part.

2. The air conditioning system of claim 1, wherein, Further comprising 3. The air conditioning system of claim 1, wherein, A gas-liquid separator having a liquid inlet and a gas outlet, the liquid inlet being connected to the fourth valve port, the gas outlet being connected to the suction port; and A heating device for heating the gas-liquid separator; and / or The air conditioning system further comprises a first supercooling device and a second supercooling device, the first supercooling device being connected between the first throttling valve and the second end of the indoor heat exchanger, the second supercooling device being connected between the second throttling valve and the second end of the indoor heat exchanger. The defrosting control method is applied to the air conditioning system according to any one of claims 1-3, and the defrosting control method comprises the following steps:

4. A defrosting control method of an air conditioning system, characterized by, When operating in a heating mode, determining whether the air conditioning system meets a defrosting condition; If yes, controlling the air conditioning system to operate in a first defrosting mode, in which one of the first part and the second part is defrosted; Determining whether the air conditioning system meets a first defrosting mode end condition; If yes, controlling the air conditioning system to exit the first defrosting mode and operate in a second defrosting mode, in which the other of the first part and the second part is defrosted; Determining whether the air conditioning system meets a second defrosting mode end condition; If yes, controlling the air conditioning system to exit the second defrosting mode; ​ In the heating mode, the first valve port and the second valve port are controlled to be communicated, the third valve port and the fourth valve port are controlled to be communicated, the second port and the third port are controlled to be communicated, the first throttle valve is throttled, the second throttle valve is throttled, the third throttle valve is fully closed, and the first on-off valve is closed. In defrosting the first part, the second port and the third port are controlled to be communicated, the first throttle valve is fully closed, the second throttle valve is throttled, the third throttle valve is fully closed, and the first on-off valve is opened. In defrosting the second part, the first port and the third port are controlled to be communicated, the first throttle valve is throttled, the second throttle valve is fully closed, the third throttle valve is throttled, and the first on-off valve is closed.

5. The defrosting control method of an air conditioning system according to claim 4, wherein In the first defrosting mode, the first part is defrosted, and in the second defrosting mode, the second part is defrosted. In the first defrosting mode, the first part is defrosted, and in the second defrosting mode, the second part is defrosted.

6. The defrosting control method of an air conditioning system according to claim 4, wherein In the first defrosting mode, the first part is defrosted, and in the second defrosting mode, the second part is defrosted. In the first defrosting mode, the first part is defrosted, and in the second defrosting mode, the second part is defrosted.

7. The defrosting control method of an air conditioning system according to claim 4, wherein The air conditioning system further comprises a gas-liquid separator and a heating device, the gas-liquid separator has a liquid inlet and a gas outlet, the liquid inlet is connected with the fourth valve port, and the gas outlet is connected with the suction port; the heating device is used for heating the gas-liquid separator; and the method further comprises the following steps: After the air conditioning system exits the second defrosting mode, the air conditioning system is controlled to run a heating start mode; It is judged whether the air conditioning system satisfies a heating start mode end condition; If yes, the air conditioning system is controlled to exit the heating start mode and run a heating mode; In the heating start mode, the second port and the third port are controlled to be communicated; the first throttle valve is throttled, the second throttle valve is throttled, the third throttle valve is fully closed, the first on-off valve is closed, and the heating device is opened. In the heating mode, the heating device is closed.

8. The defrosting control method of an air conditioning system according to claim 7, wherein, The heating start mode exit condition is that the temperature Tg3 of the indoor heat exchanger is greater than or equal to Tgo3 and lasts for a third preset time, wherein Tgo3 is a preset threshold of the temperature Tg3 of the indoor heat exchanger. 9.The defrosting control method of an air conditioning system according to claim 4, wherein, The first part is located directly above the second part, the first part is defrosted in the first defrosting mode, and the second part is defrosted in the second defrosting mode. Alternatively, The second part is located directly above the first part, the second part is defrosted in the first defrosting mode, and the first part is defrosted in the second defrosting mode.

10. A defrosting control method of an air conditioning system, characterized by, The defrosting control method is applied to the air conditioning system according to claim 2, and the defrosting control method comprises the following steps: When the heating mode is running, it is judged whether the air conditioning system meets the defrosting condition; If yes, the air conditioning system is controlled to run the first defrosting mode, in which one of the first part and the second part is defrosted; It is judged whether the air conditioning system meets the first defrosting mode end condition; If yes, the air conditioning system is controlled to exit the first defrosting mode and run the second defrosting mode, in which the other of the first part and the second part is defrosted; It is judged whether the air conditioning system meets the second defrosting mode end condition; If yes, the air conditioning system is controlled to exit the second defrosting mode; In the heating mode, the first valve port and the second valve port are controlled to be conductive, the third valve port and the fourth valve port are controlled to be conductive, the second port and the third port are controlled to be conductive, the first throttling valve is controlled to throttle, the second throttling valve is controlled to throttle, and the first on-off valve is controlled to be closed. When the first part is defrosted, the second port and the third port are controlled to be conductive, the first throttling valve is controlled to throttle, the second throttling valve is controlled to be fully closed, the third throttling valve is controlled to be fully closed, and the first on-off valve is controlled to be opened. When the second part is defrosted, the first port and the third port are controlled to be conductive, the first throttling valve is controlled to throttle, the second throttling valve is controlled to be fully opened, and the first on-off valve is controlled to be closed.

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