Air conditioning system and control method thereof

Abstract

The invention discloses an air conditioning system and a control method thereof, relates to the technical field of air conditioning, and can perform defrosting operation on a heat exchanger of an outdoor unit on the premise of not stopping heating the indoor environment. The air conditioning system comprises a compressor, an outdoor heat exchanger, an expansion valve, an indoor heat exchange device and a valve assembly. The indoor heat exchange device, the outdoor heat exchanger, the expansion valve and the compressor form a refrigerant circulation loop which comprises a first indoor heat exchanger and a second indoor heat exchanger. The valve assembly is used for controlling the flowing direction of a refrigerant, so that the refrigerant sequentially flows through the first indoor heat exchanger, the outdoor heat exchanger, the expansion valve and the second indoor heat exchanger from the compressor and then flows back to the compressor in the defrosting mode. The air conditioning system is used for adjusting the indoor temperature.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an air conditioning system and a control method thereof. Background Art

[0002] Air conditioning is a temperature regulating device that has both cooling and heating functions. It can regulate the indoor temperature and create a comfortable indoor environment.

[0003] An air conditioner generally includes an indoor unit and an outdoor unit. When the indoor unit of the air conditioner heats the indoor environment, frost easily forms on the heat exchanger surface of the outdoor unit, thereby affecting the heating performance of the indoor unit.

[0004] Currently, in order to solve the problem of frost on the surface of the heat exchanger in the outdoor unit, the existing solution requires stopping the indoor heating, which leads to a lower temperature of the indoor environment and affects the user experience. Summary of the invention

[0005] The present application provides an air conditioning system and a control method thereof, which can perform a defrosting operation on a heat exchanger of an outdoor unit without stopping heating the indoor environment.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] On the one hand, an embodiment of the present application provides an air conditioning system, including a compressor, an outdoor heat exchanger, an expansion valve, an indoor heat exchange device, and a valve assembly. The indoor heat exchange device, the outdoor heat exchanger, the expansion valve, and the compressor form a refrigerant circulation loop, including a first indoor heat exchanger and a second indoor heat exchanger. The valve assembly is used to control the flow direction of the refrigerant, so that the refrigerant flows from the compressor in the defrost mode, sequentially through the first indoor heat exchanger, the outdoor heat exchanger, the expansion valve, and the second indoor heat exchanger, and then flows back to the compressor.

[0008] The air conditioning system provided in the embodiment of the present application can control the flow direction of the refrigerant through a valve assembly when it is necessary to defrost the outdoor heat exchanger. In the defrost mode, the high-temperature and high-pressure refrigerant gas flowing out of the compressor first flows through the first indoor heat exchanger, and the first indoor heat exchanger can release heat to achieve the heating function of the indoor environment. Then, the medium-temperature and high-pressure refrigerant after heat exchange flows through the outdoor heat exchanger, and the outdoor heat exchanger also releases heat, which can remove frost on the surface of the outdoor heat exchanger and achieve defrosting of the outdoor heat exchanger.

[0009] Finally, the refrigerant flowing out of the outdoor heat exchanger flows through the expansion valve and the second indoor heat exchanger in turn, absorbs heat, becomes a low-temperature and low-pressure refrigerant gas, and then flows back to the compressor, completing the refrigerant cycle. Therefore, during the defrosting process, the air conditioning system can first use the first indoor heat exchanger to heat the indoor environment, ensuring that the indoor heat exchange device does not stop heating during the defrosting process.

[0010] In some embodiments, the valve assembly includes an outdoor valve, one end of the outdoor valve is connected to the compressor, and the other end is connected to the first end of the outdoor heat exchanger. Among them, one end of the first indoor heat exchanger is connected to the compressor, and the other end is connected to the first end of the outdoor heat exchanger. The first indoor heat exchanger is connected in parallel with the outdoor valve so that when the outdoor valve is closed, the refrigerant flows through the first indoor heat exchanger and then passes through the outdoor heat exchanger. The second end of the outdoor heat exchanger is connected to one end of the expansion valve, one end of the second indoor heat exchanger is connected to the other end of the expansion valve, and the other end of the second indoor heat exchanger is connected to the compressor.

[0011] In some embodiments, the valve assembly further comprises an indoor valve assembly. The indoor valve assembly comprises a first indoor valve. The first indoor valve is connected in parallel with the outdoor valve and in series with the first indoor heat exchanger. One end of the first indoor valve is connected to one end of the compressor or the outdoor heat exchanger, and the other end is connected to the first indoor heat exchanger.

[0012] In some embodiments, one end of the first indoor valve is connected to the compressor. The indoor valve assembly also includes a second indoor valve, a third indoor valve, and a fourth indoor valve. One end of the second indoor valve is connected between the expansion valve and one end of the second indoor heat exchanger, and the other end is connected to the other end of the first indoor heat exchanger. One end of the third indoor valve is connected between the outdoor valve and the first end of the outdoor heat exchanger, and the other end is connected between the second indoor valve and the other end of the first indoor heat exchanger. One end of the fourth indoor valve is connected between the first indoor valve and one end of the first indoor heat exchanger, and the other end is connected to the compressor.

[0013] In some embodiments, the air conditioning system further includes a temperature sensor and a controller. The temperature sensor is disposed on the outdoor heat exchanger and is used to detect the temperature of the outdoor heat exchanger. The controller is electrically connected to the temperature sensor and the valve assembly and is used to control the opening and closing of the valve assembly according to the temperature detected by the temperature sensor to adjust the flow direction of the refrigerant.

[0014] In some embodiments, the first indoor heat exchanger includes a first heat exchange element and a first heat exchange fan. The first heat exchange element is used to exchange heat with the airflow. The first heat exchange fan is located on one side of the first heat exchange element, and is used to accelerate the air flow at the first heat exchange element. The second indoor heat exchanger includes a second heat exchange element and a second heat exchange fan. The second heat exchange element is used to exchange heat with the airflow. The second heat exchange fan is located on one side of the second heat exchange element, and is used to accelerate the air flow at the second heat exchange element. Wherein, the controller is also electrically connected to the first heat exchange fan and the second heat exchange fan. The controller is also used to independently control the first heat exchange fan and the second heat exchange fan according to the temperature detected by the temperature sensor.

[0015] In some embodiments, the second indoor heat exchanger further comprises a heating device, which is located at one side of the second heat exchange element and is used to heat the airflow at the second heat exchange element.

[0016] In some embodiments, there are multiple indoor heat exchange devices, and the multiple indoor heat exchange devices respectively form a refrigerant circulation loop with the outdoor heat exchanger, the expansion valve, and the compressor.

[0017] On the other hand, an embodiment of the present application provides a control method for any of the above-mentioned air-conditioning systems, comprising: detecting the temperature T of the outdoor heat exchanger. If the temperature T of the outdoor heat exchanger is less than T0, controlling the valve assembly so that the refrigerant flows from the compressor to the first indoor heat exchanger, the outdoor heat exchanger, the expansion valve, and the second indoor heat exchanger in sequence in the defrost mode and then flows back to the compressor.

[0018] In some embodiments, the first indoor heat exchanger includes a first heat exchange element and a first heat exchange fan. The first heat exchange element is used to exchange heat with the airflow. The first heat exchange fan is located on one side of the first heat exchange element and is used to accelerate the air flow at the first heat exchange element. The second indoor heat exchanger includes a second heat exchange element and a second heat exchange fan. The second heat exchange element is used to exchange heat with the airflow. The second heat exchange fan is located on one side of the second heat exchange element and is used to accelerate the air flow at the second heat exchange element. The control method also includes: adjusting the rotation speed of the first heat exchange fan according to the temperature difference T2 of the outdoor heat exchanger within a preset time interval. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural block diagram of an air conditioning system provided in an embodiment of the present application;

[0020] Figure 2 A structural block diagram of the refrigerant flow direction of the air-conditioning system in the defrost mode provided by the embodiment of the present application;

[0021] Figure 3 A schematic diagram of the structure of another air conditioning system provided in an embodiment of the present application;

[0022] Figure 4A schematic diagram of the structure of another air conditioning system provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of another air conditioning system provided in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of the structure of another air conditioning system provided in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of the structure of another air conditioning system provided in an embodiment of the present application;

[0026] Figure 8 A schematic diagram of the structure of an indoor heat exchange device provided in an embodiment of the present application;

[0027] Fig. 9 Another schematic diagram of the structure of the indoor heat exchange device provided in the embodiment of the present application;

[0028] Fig.10 A schematic diagram of the structure of another air conditioning system provided in an embodiment of the present application;

[0029] Fig.11 A schematic diagram of the structure of another air conditioning system provided in an embodiment of the present application;

[0030] Fig.12 for Fig.11 The schematic diagram of refrigerant flow direction of the air conditioning system shown is in defrost mode;

[0031] Fig.13 for Fig.11 The schematic diagram of refrigerant flow direction of the air-conditioning system shown is in heating mode;

[0032] Fig.14 for Fig.11 The schematic diagram of refrigerant flow direction when the air-conditioning system is in cooling or dehumidification mode is shown;

[0033] Fig.15 One of the flow charts of the control method of the air-conditioning system provided in the embodiment of the present application;

[0034] Fig.16 This is a second structural diagram of the control method for the air-conditioning system provided in an embodiment of the present application.

[0035] Reference numerals:

[0036] 100-air conditioning system; 10-compressor; 20-outdoor heat exchanger; 30-expansion valve; 40-indoor heat exchange device; 41-first indoor heat exchanger; 411-first heat exchange element; 412-first heat exchange fan; 42-second indoor heat exchanger; 421-second heat exchange element; 422-second heat exchange fan; 43-volute; 44-air outlet baffle; 45-refrigerant pipe; 46-diverter; 47-gas collecting pipe; 50-valve assembly; 51-outdoor valve; 52-first indoor valve; 53-second indoor valve; 54-third indoor valve; 55-fourth indoor valve; 60-four-way valve; 70-temperature sensor; 80-oil separator; 90-gas-liquid separator. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] In the description of the present application, it should be understood that the terms, "up", "down", "left", "right", "front", "back", "inside", "outside", "center", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0040] In the description of this application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" means one or more, and "multiple" means two or more.

[0041] In the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0042] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0043] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0044] As an air conditioning device, air conditioners are widely used in daily family life. Air conditioners generally include indoor units and outdoor units. When heating the indoor environment, the heat exchanger of the indoor unit releases heat to heat the air, so that the temperature of the indoor environment increases. At the same time, the heat exchanger of the outdoor unit absorbs heat.

[0045] As shown above, when heating the indoor environment, the heat exchanger of the outdoor unit needs to absorb heat, and frost is easily generated on the surface of the heat exchanger of the outdoor unit. As the frost on the surface of the heat exchanger of the outdoor unit gradually accumulates, the heating performance of the indoor unit will gradually decrease, affecting the normal operation of the air conditioner.

[0046] In the related art, in order to defrost the heat exchanger of the outdoor unit, the method of changing the refrigerant flow direction in the air conditioner is generally adopted to make the heat exchanger in the outdoor unit heat to achieve the defrosting operation. However, during the defrosting process, the heat exchanger of the indoor unit is cooling, which causes the temperature of the indoor environment to drop, affecting the user experience.

[0047] In view of the above problems, the related technologies use methods such as optimizing defrosting control or performing zoned heat exchange on the outdoor heat exchanger to perform defrosting. However, the above methods cannot solve the problem that the indoor unit needs to be stopped for heating during defrosting.

[0048] Based on this, the embodiment of the present application provides an air conditioning system, such as Figure 1 As shown, Figure 1This is a structural block diagram of an air conditioning system 100 provided in an embodiment of the present application, and the air conditioning system 100 may include a compressor 10, an outdoor heat exchanger 20, an expansion valve 30, and an indoor heat exchange device 40. Among them, the indoor heat exchange device 40, the outdoor heat exchanger 20, the expansion valve 30, and the compressor 10 may form a refrigerant circulation loop.

[0049] The compressor 10 can compress the refrigerant gas in a high temperature and high pressure state and discharge the compressed refrigerant gas. The discharged refrigerant gas can flow into the outdoor heat exchanger 20 (or the indoor heat exchange device 40) to condense the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0050] The expansion valve 30 can expand the condensed high-temperature and high-pressure liquid refrigerant into a low-pressure liquid refrigerant. Then the indoor heat exchange device 40 (or the outdoor heat exchanger 20) evaporates the refrigerant expanded by the expansion valve 30 and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor 10.

[0051] It is understandable that the flow direction of the refrigerant may be different depending on the working state of the air conditioning system 100. For example, when the air conditioning system 100 is in the heating state, the refrigerant flows out of the compressor 10 and first flows through the indoor heat exchange device 40, and then flows back to the compressor 10 after passing through the expansion valve 30 and the outdoor heat exchanger 20 in sequence.

[0052] On the contrary, when the air conditioning system 100 is in a cooling state, the refrigerant flows out of the compressor 10 and first flows through the outdoor heat exchanger 20 , and then flows back into the compressor 10 after passing through the expansion valve 30 and the indoor heat exchange device 40 in sequence.

[0053] In order to adjust the flow direction of the refrigerant from the compressor 10, the air conditioning system 100 provided in the embodiment of the present application may further include a four-way valve ( Figure 1 The four ports of the four-way valve are respectively connected to the air inlet, the air outlet, the indoor heat exchange device 40 and the outdoor heat exchanger 20 of the compressor 10. Therefore, by controlling the on-off state of the four-way valve, the flow direction of the refrigerant from the compressor 10 can be controlled to achieve cooling and heating of the air conditioning system 100.

[0054] In order to enable the indoor heat exchange device 40 to maintain the state of heating the indoor room when the air conditioning system 100 defrosts the outdoor heat exchanger 20, as shown in FIG. Figure 2 As shown, Figure 2 This is a structural block diagram of the refrigerant flow direction of the air-conditioning system 100 in the defrost mode provided in an embodiment of the present application. The indoor heat exchange device 40 may include a first indoor heat exchanger 41 and a second indoor heat exchanger 42.

[0055] Meanwhile, the air conditioning system 100 may further include a valve assembly ( Figure 2 (not shown in the figure), the valve assembly can be used to control the flow direction of the refrigerant so that the refrigerant flows from the compressor 10 through the first indoor heat exchanger 41, the outdoor heat exchanger 20, the expansion valve 30 and the second indoor heat exchanger 42 in sequence and then flows back to the compressor 10 in the defrost mode.

[0056] Based on this, Figure 2 As shown, the air conditioning system 100 provided in the embodiment of the present application can control the flow direction of the refrigerant through a valve assembly when it is necessary to defrost the outdoor heat exchanger 20. In the defrost mode, the high-temperature and high-pressure refrigerant gas flowing out of the compressor 10 first flows through the first indoor heat exchanger 41, and the first indoor heat exchanger 41 can release heat to achieve the heating function of the indoor environment. Then, the medium-temperature and high-pressure refrigerant after heat exchange flows through the outdoor heat exchanger 20, and the outdoor heat exchanger 20 also releases heat, which can remove frost on the surface of the outdoor heat exchanger 20 and achieve defrosting of the outdoor heat exchanger 20.

[0057] Finally, the refrigerant flowing out of the outdoor heat exchanger 20 flows through the expansion valve 30 and the second indoor heat exchanger 42 in sequence, absorbs heat, becomes a low-temperature and low-pressure refrigerant gas, and then flows back into the compressor 10, completing the refrigerant cycle. Therefore, during the defrosting process, the air-conditioning system 100 can first use the first indoor heat exchanger 41 to heat the indoor environment, ensuring that the indoor heat exchange device 40 does not stop heating during the defrosting process.

[0058] In some embodiments, Figure 3 As shown, Figure 3 A schematic diagram of the structure of another air conditioning system 100 provided in an embodiment of the present application, wherein the valve assembly 50 may include an outdoor valve 51, one end of the outdoor valve 51 being connected to the compressor 10, and the other end being connected to the first end of the outdoor heat exchanger 20. Among them, one end of the first indoor heat exchanger 41 is connected to the compressor 10, and the other end is connected to the first end of the outdoor heat exchanger 20. The first indoor heat exchanger 41 is connected in parallel with the outdoor valve 51, so that when the outdoor valve 51 is closed, the refrigerant flows through the first indoor heat exchanger 41 and then passes through the outdoor heat exchanger 20.

[0059] like Figure 3 As shown, the first indoor heat exchanger 41 and the first outdoor valve 51 can be connected to the same valve port of the four-way valve 60 to achieve connection with the compressor 10. Therefore, when the outdoor valve 51 is closed, the refrigerant can flow through the first indoor heat exchanger 41 and then through the outdoor heat exchanger 20, achieving the effect of defrosting without stopping the machine.

[0060] At the same time, if Figure 3As shown, the second end of the outdoor heat exchanger 20 is connected to one end of the expansion valve 30, one end of the second indoor heat exchanger 42 is connected to the other end of the expansion valve 30, and the other end of the second indoor heat exchanger 42 is connected to the compressor 10. In this way, after the refrigerant passes through the outdoor heat exchanger 20, it can flow back into the compressor 10 after passing through the expansion valve 30 and the second indoor heat exchanger 42 in sequence.

[0061] It is understandable that if Figure 3 As shown, the second indoor heat exchanger 42 and the first indoor heat exchanger 41 can be connected to the compressor 10 through different valve ports of the four-way valve 60, so that the air-conditioning system 100 can form a refrigerant circuit.

[0062] based on Figure 3 In the scheme shown, when the air conditioning system 100 is in a normal cooling state, the outdoor valve 51 can be in an open state, and the on-off of the four-way valve 60 is controlled at the same time. After the refrigerant flows out of the compressor 10, it can first pass through the outdoor heat exchanger 20 to release heat, and then pass through the expansion valve 30 and the second indoor heat exchanger 42 before flowing back to the compressor 10. In the above process, the second indoor heat exchanger 42 can cool the room.

[0063] When the air conditioning system 100 is in a normal heating state, the outdoor valve 51 can also be in an open state, and the on-off of the four-way valve 60 is controlled at the same time. After the refrigerant flows out of the compressor 10, it can first pass through the second indoor heat exchanger 42 to release heat to achieve indoor heating. The refrigerant then flows back to the compressor 10 after passing through the expansion valve 30 and the outdoor heat exchanger 20.

[0064] In some embodiments, Figure 4 As shown, Figure 4 A schematic diagram of the structure of another air conditioning system 100 provided in an embodiment of the present application, wherein the valve assembly 50 further includes an indoor valve assembly. The indoor valve assembly includes a first indoor valve 52. The first indoor valve 52 is connected in parallel with the outdoor valve 51 and in series with the first indoor heat exchanger 41. One end of the first indoor valve 52 is connected to one end of the compressor 10 or the outdoor heat exchanger 20, and the other end is connected to the first indoor heat exchanger 41.

[0065] based on Figure 4 In the scheme shown, when the air conditioning system 100 is in a normal cooling or heating state, the outdoor valve 51 can be in an open state and the first indoor valve 52 can be in a closed state. At the same time, the on-off of the four-way valve 60 is controlled to control the flow direction of the refrigerant, so that the air conditioning system 100 only flows through the second indoor heat exchanger 42 in the cooling or heating state, avoiding the air conditioning system 100 in the cooling or heating state. When the refrigerant flows through the first indoor heat exchanger 41, it will produce an opposite effect with the second indoor heat exchanger 42, affecting the indoor temperature change.

[0066] Therefore, by setting the first indoor valve 52, the air-conditioning system 100 can put the first indoor heat exchanger 41 into a shutdown state in normal cooling or heating mode, thereby avoiding adverse effects on the indoor temperature, ensuring the indoor cooling or heating efficiency of the indoor heat exchange device 40, and improving the user experience.

[0067] It is understandable that the first indoor valve 52 can be connected to different positions of the first indoor heat exchanger 41. For example, Figure 4 As shown, the first indoor valve 52 can be connected to an end of the first indoor heat exchanger 41 away from the outdoor heat exchanger 20. In this case, one end of the first indoor valve 52 is connected to the compressor 10. Alternatively, the first indoor valve 52 can also be connected to an end of the first indoor heat exchanger 41 close to the outdoor heat exchanger 20. In this case, one end of the first indoor valve 52 can be connected to the first end of the outdoor heat exchanger 20.

[0068] like Figure 5 As shown, Figure 5 A structural schematic diagram of another air-conditioning system 100 provided in an embodiment of the present application, when one end of the first indoor valve 52 is connected to the compressor 10, in some embodiments, the indoor valve assembly may also include a second indoor valve 53, a third indoor valve 54 and a fourth indoor valve 55.

[0069] One end of the second indoor valve 53 is connected between the expansion valve 30 and one end of the second indoor heat exchanger 42. The other end of the second indoor valve 53 is connected to the other end of the first indoor heat exchanger 41. One end of the third indoor valve 54 is connected between the outdoor valve 51 and the first end of the outdoor heat exchanger 20, and the other end is connected between the second indoor valve 53 and the other end of the first indoor heat exchanger 41. One end of the fourth indoor valve 55 is connected between the first indoor valve 52 and one end of the first indoor heat exchanger 41. The other end of the fourth indoor valve 55 is connected to the compressor 10.

[0070] When the air conditioning system 100 is in a normal cooling state, the outdoor valve 51 can be in an open state, and the refrigerant in the compressor 10 can enter the outdoor heat exchanger 20 for heat exchange through the outdoor valve 51 by controlling the on-off of the four-way valve 60. At the same time, the first indoor valve 52 and the third indoor valve 54 are controlled to be closed, so as to prevent the refrigerant flowing out of the compressor 10 from directly entering the first indoor heat exchanger 41 for heat exchange, thereby affecting the normal cooling of the indoor environment.

[0071] Then, the refrigerant flowing out of the outdoor heat exchanger 20 can enter the second indoor heat exchanger 42 after passing through the expansion valve 30, and the second indoor heat exchanger 42 can normally cool the room. At the same time, the second indoor valve 53 and the fourth indoor valve 55 are controlled to be opened, and the refrigerant flowing out of the expansion valve 30 can also pass through the first indoor heat exchanger 41 for heat exchange, so that the first indoor heat exchanger 41 can also cool the indoor environment, so that the cooling efficiency of the air-conditioning system 100 is better.

[0072] Similarly, when the air conditioning system 100 is in a normal heating state, the outdoor valve 51 can be in an open state, and the refrigerant in the compressor 10 can enter the second indoor heat exchanger 42 for heat exchange by controlling the on-off of the four-way valve 60. At the same time, the first indoor valve 52 and the third indoor valve 54 are controlled to be closed, and the second indoor valve 53 and the fourth indoor valve 55 are controlled to be opened, and the refrigerant in the compressor 10 can also enter the first indoor heat exchanger 41 for heat exchange. At this time, the first indoor heat exchanger 41 and the second indoor heat exchanger 42 can also heat the indoor environment at the same time, and the heating efficiency is high.

[0073] Next, the refrigerant flowing out of the first indoor heat exchanger 41 and the second indoor heat exchanger 42 enters the outdoor heat exchanger 20 after passing through the expansion valve 30, and flows back to the compressor 10 after heat exchange with the external environment to complete the refrigerant circulation.

[0074] In some embodiments, Figure 6 As shown, Figure 6 The structural diagram of another air conditioning system 100 provided in an embodiment of the present application, the air conditioning system 100 further includes a temperature sensor 70 and a controller. The temperature sensor 70 is disposed on the outdoor heat exchanger 20 and is used to detect the temperature of the outdoor heat exchanger 20. The temperature change of the outdoor heat exchanger 20 can be detected by the temperature sensor 70.

[0075] The controller (not shown) is electrically connected to the temperature sensor 70 and the valve assembly 50, and is used to control the opening and closing of the valve assembly 50 according to the temperature detected by the temperature sensor 70 to adjust the flow direction of the refrigerant. When the temperature of the outdoor heat exchanger 20 is too low and it is easy to frost, the controller can control the valve assembly 50 according to the temperature detected by the temperature sensor 70, so that the air conditioning system 100 enters the defrost mode, and defrosts the outdoor heat exchanger 20 without stopping heating the indoor environment.

[0076] Accordingly, when the temperature of the outdoor heat exchanger 20 is at a normal temperature that is not prone to frost formation, the controller can control the valve assembly 50 according to the temperature detected by the temperature sensor 70 to adjust the air-conditioning system 100 to a normal heating mode.

[0077] Therefore, through the controller and the temperature sensor 70 , the air conditioning system 100 can intelligently switch the mode of the air conditioning system 100 in real time according to the temperature of the outdoor heat exchanger 20 to achieve defrosting of the outdoor heat exchanger 20 .

[0078] In some embodiments, Figure 7 As shown, Figure 7 A schematic diagram of the structure of another air conditioning system 100 provided in an embodiment of the present application, wherein the first indoor heat exchanger 41 includes a first heat exchange element 411 and a first heat exchange fan 412. The first heat exchange element 411 is used to exchange heat with the airflow. The first heat exchange fan 412 is located on one side of the first heat exchange element 411 and is used to accelerate the air flow at the first heat exchange element 411.

[0079] Thus, when the air conditioning system 100 is in the process of defrosting the outdoor heat exchanger 20, when the power of the first heat exchange fan 412 is relatively large, the refrigerant flowing out of the compressor 10 can more fully exchange heat with the outside air when passing through the first heat exchange element 411, thereby ensuring the indoor heating effect in the defrosting mode. Accordingly, when the refrigerant reaches the outdoor heat exchanger 20 after passing through the first indoor heat exchanger 41, the defrosting effect on the outdoor heat exchanger 20 is also reduced accordingly.

[0080] It is understandable that in actual applications, the power of the first heat exchange fan 412 can be adjusted according to actual conditions, and the heat exchange efficiency of the first indoor heat exchanger 41 and the outdoor heat exchanger 20 can be reasonably adjusted. For example, when the defrosting effect of the outdoor heat exchanger 20 is to be improved, the power of the first heat exchange fan 412 can be reduced. When the heating effect of the indoor environment is to be ensured during the defrosting process, the power of the first heat exchange fan 412 can be increased.

[0081] Similarly, the second indoor heat exchanger 42 includes a second heat exchange element 421 and a second heat exchange fan 422. The second heat exchange element 421 is used to exchange heat with the airflow. The second heat exchange fan 422 is located on one side of the second heat exchange element 421 and is used to accelerate the air flow at the second heat exchange element 421.

[0082] As can be seen from the above, when the air conditioning system 100 is defrosting the outdoor heat exchanger 20, since the second indoor heat exchanger 42 is in a cooling state, it will affect the indoor temperature and reduce the heating efficiency of the air conditioning system 100 on the indoor environment. Therefore, when the air conditioning system 100 is in the defrosting process, the second heat exchange fan 422 can be controlled to be turned off, so that the second indoor heat exchanger 42 is not easy to affect the indoor environment, ensuring the indoor heating effect of the air conditioning system 100.

[0083] like Figure 8 As shown, Figure 8A schematic diagram of the structure of an indoor heat exchange device 40 provided in an embodiment of the present application, wherein a first heat exchange fan 412 ( Figure 7 ) and the second heat exchange fan 422 ( Figure 7 ) may include a volute 43 and a fan disposed inside the volute 43 ( Figure 8 Meanwhile, the indoor heat exchange device 40 may further include a plurality of air outlet baffles 44. The air outlet baffles 44 are disposed between the first heat exchange element 411 and the second heat exchange element 421 so that the airflows at the first heat exchange element 411 and the second heat exchange element 421 do not interfere with each other.

[0084] like Fig. 9 As shown, Fig. 9 Another structural schematic diagram of the indoor heat exchange device 40 provided in the embodiment of the present application, the first heat exchange element 411 ( Figure 7 ) and the second heat exchange member 421( Figure 7 ) may include a refrigerant tube 45 and fins (not shown) disposed on the refrigerant tube 45. Both ends of the refrigerant tube 45 of the first heat exchanger 411 and the second heat exchanger 421 may be connected to each other through a splitter 46 and a gas collecting pipe 47, respectively.

[0085] In some embodiments, Fig.10 As shown, Fig.10 The second indoor heat exchanger 42 may further include a heating device 423. The heating device 423 is located on one side of the second heat exchange element 421 and is used to heat the airflow at the second heat exchange element 421.

[0086] Based on this, when the air conditioning system 100 is in the process of defrosting the outdoor heat exchanger 20, the heating device 423 can be turned on. At this time, the airflow near the second indoor heat exchanger 42 is heated by the heating device 423, so that the second indoor heat exchanger 42 is not likely to have a significant impact on the indoor ambient temperature in the defrosting mode. It can be understood that the heating device 423 only needs to heat the airflow, and no further explanation is given here.

[0087] In some embodiments, Fig.11 As shown, Fig.11 This is a structural diagram of another air conditioning system 100 provided in an embodiment of the present application, wherein there are multiple indoor heat exchange devices 40. The multiple indoor heat exchange devices 40 respectively form a refrigerant circulation loop with the outdoor heat exchanger 20, the expansion valve 30 and the compressor 10.

[0088] As mentioned above, in the air-conditioning system 100 provided in the embodiment of the present application, during the process of defrosting the outdoor heat exchanger 20, each indoor heat exchange device 40 can continue to heat the indoor environment without stopping, thereby ensuring the user experience.

[0089] It is understandable that if Fig.11 As shown, the number of indoor valves can also be multiple. Each component in the indoor valve is installed at a corresponding position of multiple indoor heat exchange devices 40, so that each indoor heat exchange device 40 can defrost the outdoor heat exchanger 20 without stopping.

[0090] Below, Fig.11 Taking the air conditioning system 100 shown in FIG. 1 as an example, the refrigerant flow direction of the air conditioning system 100 in different modes is exemplarily described. Fig.12 As shown, Fig.12 for Fig.11 The schematic diagram of the refrigerant flow direction of the air conditioning system 100 in the defrost mode shows that the refrigerant in the compressor 10 flows to the first indoor heat exchanger 41 of each indoor heat exchange device 40 after passing through the four-way valve 60, and the indoor environment is heated by the first indoor heat exchanger 41. Then, the refrigerant flowing out of the multiple first indoor heat exchangers 41 merges and flows into the outdoor heat exchanger 20, and the outdoor heat exchanger 20 is defrosted. Finally, the refrigerant flowing out of the outdoor heat exchanger 20 flows through the expansion valve 30 and enters the second indoor heat exchanger 42 of each indoor heat exchange device 40, and finally merges and passes through the four-way valve 60 to return to the compressor 10.

[0091] like Fig.13 As shown, Fig.13 for Fig.11 The schematic diagram of the refrigerant flow direction of the air conditioning system 100 in the heating mode shows that the refrigerant in the compressor 10 flows through the four-way valve 60 and then flows into the first indoor heat exchanger 41 and the second indoor heat exchanger 42 of each indoor heat exchange device 40, respectively, and the first indoor heat exchanger 41 and the second indoor heat exchanger 42 are used for heating. Then, the refrigerant flowing out of the first indoor heat exchanger 41 and the second indoor heat exchanger 42 merges and flows through the expansion valve 30 and then flows to the outdoor heat exchanger 20. Finally, the refrigerant flowing out of the outdoor heat exchanger 20 returns to the compressor 10 through the four-way valve 60.

[0092] like Fig.14 As shown, Fig.14 for Fig.11 The schematic diagram of the refrigerant flow direction of the air conditioning system 100 in the cooling or dehumidification mode shows that the refrigerant in the compressor 10 passes through the four-way valve 60 and then flows through the outdoor heat exchanger 20 for heat exchange. Then, the refrigerant flowing out of the outdoor heat exchanger 20 passes through the expansion valve 30 and then flows into the first heat exchanger and the second heat exchanger of the plurality of indoor heat exchange devices 40, respectively, and the first heat exchanger and the second heat exchanger are used to cool the indoor space. Finally, the refrigerant flowing out of the first indoor heat exchanger 41 and the second indoor heat exchanger 42 converge and then pass through the four-way valve 60 to return to the compressor 10.

[0093] It is understandable that if Fig.11 As shown, the air conditioning system 100 provided in the embodiment of the present application may also include an oil separator 80 and a gas-liquid separator 90. The lubricating oil mixed in the high-temperature and high-pressure gaseous refrigerant can be separated in the process of flowing through the oil separator 80. The gas-liquid separator 90 can separate non-gaseous impurities (such as liquid refrigerant, liquid lubricating oil or other impurities) to prevent the above impurities from entering the compressor and affecting the stable operation of the compressor 10. In addition, Fig.11 As shown, the number of expansion valves 30 can be multiple, one of the multiple expansion valves 30 can be used as an outdoor expansion valve, and one end of the remaining expansion valves is respectively connected to one end of the outdoor expansion valve, and the other end is respectively connected between the second indoor valve 53 and one end of the second indoor heat exchanger 42.

[0094] On the other hand, the present application embodiment provides a control method for an air conditioning system, such as Fig.15 As shown, Fig.15 This is one of the flow charts of the control method of the air-conditioning system provided in the embodiment of the present application. The control method includes steps S100 to S200.

[0095] S100: Detect the temperature T of the outdoor heat exchanger.

[0096] S200: If the temperature of the outdoor heat exchanger T<T0, control the valve assembly so that the refrigerant flows from the compressor through the first indoor heat exchanger, the outdoor heat exchanger, the expansion valve and the second indoor heat exchanger in sequence in the defrost mode and then flows back to the compressor.

[0097] Therefore, by detecting the temperature of the outdoor heat exchanger, when the temperature of the outdoor heat exchanger T<T0, the air conditioning system can be controlled to enter the defrost mode, and the outdoor heat exchanger can be defrosted without stopping the machine, which not only ensures that the air conditioner can continue to heat the indoor environment, but also ensures that a large amount of frost will not accumulate on the surface of the outdoor heat exchanger. Among them, the preset temperature T0 can be selected according to actual needs.

[0098] In some embodiments, Fig.16 As shown, Fig.16 This is a second structural diagram of the control method for the air-conditioning system provided in an embodiment of the present application. The control method further includes step S300.

[0099] S300: adjusting the rotation speed of the first heat exchange fan according to the temperature difference T2 of the outdoor heat exchanger within a preset time interval.

[0100] Therefore, by detecting the temperature difference T2 of the outdoor heat exchanger within the preset time interval during the defrosting process, the defrosting efficiency of the outdoor heat exchanger can be adjusted by adjusting the speed of the first heat exchange fan to ensure that the outdoor heat exchanger can perform the defrosting operation at an appropriate speed. Similarly, the specific value of the temperature difference T2 can also be selected according to actual conditions.

[0101] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An air conditioning system, characterized in that: include: compressor; Outdoor heat exchanger; Expansion valve; an indoor heat exchange device, comprising a first indoor heat exchanger and a second indoor heat exchanger, forming a refrigerant circulation flow path with the outdoor heat exchanger, the expansion valve and the compressor; and A valve assembly is used to control the flow direction of the refrigerant so that the refrigerant flows from the compressor through the first indoor heat exchanger, the outdoor heat exchanger, the expansion valve and the second indoor heat exchanger in sequence in the defrost mode and then flows back to the compressor.

2. The air conditioning system according to claim 1, characterized in that: The valve assembly comprises: an outdoor valve, one end of the outdoor valve being connected to the compressor, and the other end of the outdoor valve being connected to the first end of the outdoor heat exchanger; Wherein, one end of the first indoor heat exchanger is connected to the compressor, and the other end is connected to the first end of the outdoor heat exchanger; the first indoor heat exchanger is connected in parallel with the outdoor valve, so that when the outdoor valve is closed, the refrigerant flows through the first indoor heat exchanger and then passes through the outdoor heat exchanger; The second end of the outdoor heat exchanger is connected to one end of the expansion valve; one end of the second indoor heat exchanger is connected to the other end of the expansion valve, and the other end of the second indoor heat exchanger is connected to the compressor.

3. The air conditioning system according to claim 2, characterized in that: The valve assembly further comprises: An indoor valve assembly, wherein the indoor valve assembly includes a first indoor valve, wherein the first indoor valve is connected in parallel with the outdoor valve and in series with the first indoor heat exchanger; one end of the first indoor valve is connected to one end of the compressor or the outdoor heat exchanger, and the other end of the first indoor valve is connected to the first indoor heat exchanger.

4. The air conditioning system according to claim 3, characterized in that: One end of the first indoor valve is connected to the compressor; The indoor valve assembly also includes: a second indoor valve, one end of which is connected between the expansion valve and one end of the second indoor heat exchanger; and the other end of which is connected to the other end of the first indoor heat exchanger; a third indoor valve, one end of the third indoor valve being connected between the outdoor valve and the first end of the outdoor heat exchanger, and the other end of the third indoor valve being connected between the second indoor valve and the other end of the first indoor heat exchanger; and A fourth indoor valve, one end of which is connected between the first indoor valve and one end of the first indoor heat exchanger; and the other end of which is connected to the compressor.

5. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises: a temperature sensor, the temperature sensor being disposed on the outdoor heat exchanger and being used to detect the temperature of the outdoor heat exchanger; and A controller is electrically connected to the temperature sensor and the valve assembly; the controller is used to control the opening and closing of the valve assembly according to the temperature detected by the temperature sensor to adjust the flow direction of the refrigerant.

6. The air conditioning system according to claim 5, characterized in that: The first indoor heat exchanger comprises: a first heat exchange element, the first heat exchange element being used to exchange heat with the airflow; and a first heat exchange fan, the first heat exchange fan being located at one side of the first heat exchange element and being used to accelerate the airflow at the first heat exchange element; The second indoor heat exchanger comprises: a second heat exchange element, the second heat exchange element being used to exchange heat with the airflow; and a second heat exchange fan, the second heat exchange fan being located at one side of the second heat exchange element and being used for accelerating the airflow at the second heat exchange element; Wherein, the controller is also electrically connected to the first heat exchange fan and the second heat exchange fan; the controller is also used to independently control the first heat exchange fan and the second heat exchange fan according to the temperature detected by the temperature sensor.

7. The air conditioning system according to claim 6, characterized in that: The second indoor heat exchanger also includes: A heating device is located at one side of the second heat exchange element; the heating device is used to heat the airflow at the second heat exchange element.

8. The air conditioning system according to claim 1, characterized in that: There are multiple indoor heat exchange devices; the multiple indoor heat exchange devices respectively form a refrigerant circulation loop with the outdoor heat exchanger, the expansion valve and the compressor.

9. A control method for an air conditioning system according to any one of claims 1 to 8, characterized in that: include: Detecting the temperature T of the outdoor heat exchanger; If the temperature T of the outdoor heat exchanger is less than T0, the valve assembly is controlled so that the refrigerant flows from the compressor through the first indoor heat exchanger, the outdoor heat exchanger, the expansion valve and the second indoor heat exchanger in sequence in the defrost mode and then flows back to the compressor.

10. The control method of the air conditioning system according to claim 9, characterized in that: The first indoor heat exchanger comprises: A first heat exchange element, wherein the first heat exchange element is used to exchange heat with; and a first heat exchange fan, the first heat exchange fan being located at one side of the first heat exchange element and being used to accelerate the airflow at the first heat exchange element; The second indoor heat exchanger comprises: A second heat exchange element, the second heat exchange element is used to exchange heat with; and a second heat exchange fan, the second heat exchange fan being located at one side of the second heat exchange element and being used for accelerating the airflow at the second heat exchange element; The control method further comprises: The rotation speed of the first heat exchange fan is adjusted according to the temperature difference T2 of the outdoor heat exchanger within a preset time interval.

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