Air conditioner

Abstract

The embodiment of the application provides an outdoor unit and an air conditioner, the outdoor unit comprises a compressor, a four-way valve, an outdoor heat exchanger and a flash evaporator, the outdoor heat exchanger comprises a heat exchange main pipe, a flow divider and a plurality of heat exchange branch pipes, the flash evaporator has a liquid inlet, a liquid outlet and a gas outlet, the flow divider has a flow converging port and a plurality of flow dividing ports, the throttling device, the heat exchange main pipe, the liquid inlet, the liquid outlet and the flow converging port are sequentially connected, the plurality of flow dividing ports and the plurality of heat exchange branch pipes are connected in one-to-one correspondence, and the gas outlet and a suction port of the compressor are communicated.

Description

Technical Field

[0001] This application relates to the field of air conditioner technology, specifically to an air conditioner. Background Technology

[0002] In related technologies, when an air conditioner starts heating in a low-temperature environment, it cannot quickly raise the indoor temperature, resulting in a low heating rate. Furthermore, the compressor has difficulty operating in a low-temperature environment, which can easily cause damage to the compressor structure and reduce its reliability. Utility Model Content

[0003] This application provides an air conditioner that can quickly raise the indoor temperature in low-temperature environments, achieving a rapid heating effect, and can improve the operational reliability of the compressor in low-temperature environments.

[0004] The air conditioner provided in this application embodiment includes a refrigeration cycle circuit, comprising a compressor, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger. The four-way valve is connected to the exhaust port of the compressor, the suction port of the compressor, the indoor heat exchanger, and the outdoor heat exchanger, respectively. The indoor heat exchanger, the throttling device, and the outdoor heat exchanger are connected in series. A bypass flow path is provided, with one end connected to the connecting pipe between the throttling device and the outdoor heat exchanger, and the other end connected to the suction port of the compressor. A first shut-off valve is provided on the bypass flow path.

[0005] In some embodiments, the throttling device includes a first throttling component and a second throttling component. The first throttling component includes a first throttling valve and a first check valve connected in parallel. The second throttling component includes a second throttling valve and a second check valve connected in parallel. The indoor heat exchanger, the first throttling component, the second throttling component, and the outdoor heat exchanger are connected in series. When the air conditioner is cooling, the first check valve is closed and the second check valve is open. When the air conditioner is heating, the first check valve is open and the second check valve is closed.

[0006] In some embodiments, the second throttling assembly further includes a third one-way valve, which is connected in series with the second throttling valve and in parallel with the second one-way valve; when the air conditioner is cooling, the third one-way valve is closed; when the air conditioner is heating, the third one-way valve is open.

[0007] In some embodiments, the air conditioner further includes a flash evaporator having a liquid inlet, a liquid outlet, and an air outlet; the outdoor heat exchanger includes a heat exchange main pipe, a distributor, and multiple heat exchange branch pipes, the distributor having a manifold and multiple branch outlets, the throttling device, the heat exchange main pipe, the liquid inlet, the liquid outlet, and the manifold are connected in sequence, the multiple branch outlets and the multiple heat exchange branch pipes are connected one-to-one, and the air outlet is connected to the suction port of the compressor.

[0008] In some embodiments, the first shut-off valve has a first valve port, a second valve port, and a third valve port. The first valve port is connected to a connecting pipe between the throttling device and the heat exchange manifold, the second valve port is connected to the outlet, and the third valve port is connected to the suction port of the compressor.

[0009] In some embodiments, the air conditioner includes an outdoor unit and an indoor unit. The outdoor unit is provided with the compressor, the four-way valve, the outdoor heat exchanger, the bypass flow path, the first refrigerant connection terminal, and the second refrigerant connection terminal, which are connected in sequence.

[0010] In some embodiments, the first refrigerant connection end is a two-way shut-off valve, and the second refrigerant connection end is a three-way shut-off valve.

[0011] In some embodiments, the air conditioner further includes a first refrigerant pipe and a second refrigerant pipe, wherein the first refrigerant connection end is connected to the indoor heat exchanger through the first refrigerant pipe, and the second refrigerant connection end is connected to the indoor heat exchanger through the second refrigerant pipe.

[0012] In some embodiments, the air conditioner is provided with an external pipe temperature sensor and an external ambient temperature sensor. The external pipe temperature sensor is disposed on the outdoor heat exchanger and is used to measure the temperature of the outdoor heat exchanger. The external ambient temperature sensor is used to measure the outdoor ambient temperature.

[0013] In some embodiments, the air conditioner is provided with an inner pipe temperature sensor and an inner ambient temperature sensor. The inner pipe temperature sensor is disposed on the indoor heat exchanger and is used to measure the temperature of the indoor heat exchanger. The inner ambient temperature sensor is disposed at the indoor return air vent of the air conditioner and is used to measure the indoor return air temperature.

[0014] This embodiment of the application, by setting a bypass flow path, can control the first shut-off valve and the bypass flow path to switch to the conducting state when there is a need for rapid heating in a low-temperature environment. This allows all or at least most of the refrigerant discharged from the compressor to flow through the indoor heat exchanger and the throttling device and then return to the compressor through the bypass flow path. This enables the refrigerant to absorb heat from the indoor return air and raise its temperature, thereby rapidly increasing the compressor's discharge temperature and lubricating oil temperature. On the one hand, by increasing the discharge temperature, the refrigerant temperature of the indoor heat exchanger is quickly raised to the target temperature that can release heat to the indoor return air, achieving a rapid heating effect. On the other hand, by increasing the lubricating oil temperature, the fluidity and lubrication protection effect of the lubricating oil are improved, and the operational reliability of the compressor is improved. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a connection structure diagram of an air conditioner provided in some embodiments of this application;

[0017] Figure 2 This is a diagram showing the refrigerant flow direction of an air conditioner during conventional heating, provided in some embodiments of this application;

[0018] Figure 3 This is a diagram showing the refrigerant flow direction of an air conditioner during rapid heating, provided in some embodiments of this application;

[0019] Figure 4 This is a diagram showing the refrigerant flow direction of an air conditioner during cooling, provided in some embodiments of this application;

[0020] Figure 5 This is a connection structure diagram of the outdoor heat exchanger of an air conditioner provided in some embodiments of this application.

[0021] Explanation of key component symbols:

[0022] 1-Air conditioner, 10-Compressor, 20-Four-way valve, 30-Indoor heat exchanger, 40-Throttling device, 41-First throttling assembly, 411-First throttling valve, 412-First check valve, 42-Second throttling assembly, 421-Second throttling valve, 422-Second check valve, 423-Third check valve, 50-Outdoor heat exchanger, 51-Heat exchange main pipe, 52-Distributor, 53-Heat exchange branch pipe, 60-Bypass flow path, 61-First shut-off valve, 70-Flash evaporator, 81-Outdoor ambient temperature sensor, 82-Outdoor pipe temperature sensor, 91-Indoor ambient temperature sensor, 92-Indoor pipe temperature sensor, 101-Outdoor unit, 1011-First refrigerant connection terminal, 1012-Second refrigerant connection terminal, 102-Indoor unit, 103-First refrigerant pipe, 104-Second refrigerant pipe. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0026] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0027] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0028] like Figures 1 to 4 As shown, this application embodiment provides an air conditioner 1, which includes a refrigeration cycle loop and a bypass flow path 60. It can rapidly raise the indoor ambient temperature in low-temperature environments, achieving a rapid heating effect, and can improve the operational reliability of the compressor 10 in low-temperature environments. The type of air conditioner 1 can be determined according to actual needs, and can be, for example, a split-type air conditioner 1 (wall-mounted / cabinet-type) or an integrated type such as a window-type air conditioner 1. This application embodiment does not limit this type.

[0029] The refrigeration cycle circuit includes a compressor 10, a four-way valve 20, an indoor heat exchanger 30, a throttling device 40, and an outdoor heat exchanger 50. The four-way valve 20 is connected to the discharge port of the compressor 10, the suction port of the compressor 10, the indoor heat exchanger 30, and the outdoor heat exchanger 50, respectively. The indoor heat exchanger 30, the throttling device 40, and the outdoor heat exchanger 50 are connected in series.

[0030] One end of the bypass flow path 60 is connected to the connecting pipe between the throttling device 40 and the outdoor heat exchanger 50, and the other end is connected to the suction port of the compressor 10. Here, the bypass flow path 60 is provided with a first shut-off valve 61, which is used to control the bypass flow path 60 to switch between the open state and the shut-off state.

[0031] When the air conditioner 1 does not need to achieve rapid heating but only needs to perform regular heating, the first shut-off valve 61 can be switched to the shut-off state so that the bypass flow path 60 is kept closed. All the refrigerant discharged from the exhaust port of the compressor 10 can flow through the four-way valve 20, the indoor heat exchanger 30, the throttling device 40 and the outdoor heat exchanger 50 in sequence and return to the suction port of the compressor 10 to achieve refrigerant circulation.

[0032] When the air conditioner 1 needs to achieve rapid heating in a low-temperature environment, the temperature of the gaseous refrigerant discharged by the compressor 10 is low during the initial start-up phase. It is usually lower than the indoor ambient temperature but higher than the outdoor ambient temperature, which causes the indoor heat exchanger 30 to be unable to heat up quickly and the heating effect to be poor. At this time, the first shut-off valve 61 can be switched to the conducting state to keep the bypass flow path 60 conducting. All or at least most of the refrigerant discharged from the exhaust port of the compressor 10 can flow sequentially through the four-way valve 20, the indoor heat exchanger 30, the throttling device 40 and the bypass flow path 60 before returning to the suction port of the compressor 10 to achieve refrigerant circulation. When the refrigerant flows through the indoor heat exchanger 30, it can absorb heat from the indoor return air to achieve refrigerant temperature rise. After absorbing heat and raising its temperature, the refrigerant returns to the compressor 10 through the bypass flow path 60 to quickly increase the exhaust temperature and lubricating oil temperature of the compressor 10. This quickly raises the refrigerant temperature of the indoor heat exchanger 30 to a target temperature at least higher than the indoor ambient temperature. After the heating effect of the indoor heat exchanger 30 is good, the indoor fan is started to blow warm air into the room to achieve a rapid heating effect. At the same time, the increase in lubricating oil temperature improves the fluidity and lubrication protection effect of the lubricating oil, thereby improving the operational reliability of the compressor 10. During the operation phase where the refrigerant absorbs heat from the indoor return air, the indoor return air vent of air conditioner 1 can remain open, while the indoor air supply vent or indoor fan can remain closed to prevent cold air from being blown into the room.

[0033] Compared with related technologies, the air conditioner 1 provided in this application embodiment can control the first shut-off valve 61 and the bypass flow path 60 to switch to the conducting state when there is a need for rapid heating in a low-temperature environment. This allows all or at least most of the refrigerant discharged from the compressor 10 to flow through the indoor heat exchanger 30 and the throttling device 40 and then return to the compressor 10 through the bypass flow path 60. This allows the refrigerant to absorb heat from the indoor return air and increase its temperature, thereby rapidly increasing the discharge temperature and lubricating oil temperature of the compressor 10. On the one hand, by increasing the discharge temperature, the refrigerant temperature of the indoor heat exchanger 30 is quickly raised to the target temperature that can release heat to the indoor return air, achieving a rapid heating effect. On the other hand, by increasing the lubricating oil temperature, the fluidity and lubrication protection effect of the lubricating oil are improved, and the operational reliability of the compressor 10 is improved.

[0034] In some embodiments, the throttling device 40 may include a first throttling assembly 41 and a second throttling assembly 42. The first throttling assembly 41 may include a first throttling valve 411 and a first one-way valve 412 arranged in parallel, and the second throttling assembly 42 includes a second throttling valve 421 and a second one-way valve 422 arranged in parallel. The indoor heat exchanger 30, the first throttling assembly 41, the second throttling assembly 42, and the outdoor heat exchanger 50 are connected in series. When the air conditioner 1 is cooling, the first one-way valve 412 is closed and the second one-way valve 422 is open, so that the refrigerant discharged by the compressor 10 flows sequentially through the four-way valve 20, the outdoor heat exchanger 50, the second one-way valve 422, the first throttling valve 411, and the indoor heat exchanger 30 before returning to the four-way valve 20 and then entering the compressor 10. When the air conditioner 1 is in normal heating mode, the first one-way valve 412 is open while the second one-way valve 422 is closed, and the first shut-off valve 61 remains closed, so that the refrigerant discharged from the compressor 10 flows sequentially through the four-way valve 20, the indoor heat exchanger 30, the first one-way valve 412, the second throttle valve 421 and the outdoor heat exchanger 50 before returning to the four-way valve 20 and then entering the compressor 10; when the air conditioner 1 is in rapid heating mode, the first one-way valve 412 is open while the second one-way valve 422 is closed, and the first shut-off valve 61 remains open, so that the refrigerant discharged from the compressor 10 flows sequentially through the four-way valve 20, the indoor heat exchanger 30, the first one-way valve 412, the second throttle valve 421 and the bypass flow path 60 before returning to the compressor 10.

[0035] In some examples, the second throttling assembly 42 may also include a third check valve 423. The third check valve 423 and the second throttling valve 421 are connected in series, and the third check valve 423 and the second check valve 422 are connected in parallel. When the air conditioner 1 is cooling, the third check valve 423 is closed to prevent the refrigerant discharged from the outdoor heat exchanger 50 from flowing incorrectly to the bypass path 60 and the second throttling valve 421; while when the air conditioner 1 is heating, the third check valve 423 is open, allowing the refrigerant throttled by the second throttling valve 421 to flow to the outdoor heat exchanger 50.

[0036] like Figures 1 to 5As shown, in some embodiments, the air conditioner 1 may further include a flash evaporator 70, which has a liquid inlet, a liquid outlet, and an air outlet. The outdoor heat exchanger 50 may include a heat exchange main pipe 51, a distributor 52, and multiple heat exchange branch pipes 53. The distributor 52 has a manifold and multiple branch ports. The throttling device 40, the heat exchange main pipe 51, the liquid inlet, the liquid outlet, and the manifold are connected in sequence. The multiple branch ports and the multiple heat exchange branch pipes 53 are connected one-to-one. The air outlet is connected to the suction port of the compressor 10. For example, the second throttling assembly 42 has the heat exchange main pipe 51, the liquid inlet, the liquid outlet, and the manifold connected in sequence. When the air conditioner 1 is heating, the refrigerant after being throttled by the throttling device 40 flows sequentially through the heat exchange main pipe 51 and the flash evaporator 70. The flash evaporator 70 separates the refrigerant into gas and liquid. The separated liquid refrigerant can flow into the distributor 52 through the liquid outlet, and then into each heat exchange branch pipe 53 after being split by the distributor 52. This reduces the dryness of the refrigerant in each heat exchange branch pipe 53 and increases the heat transfer coefficient and heat absorption of the heat exchange branch pipe 53. The separated gaseous refrigerant can return to the compressor 10 through the gas outlet.

[0037] The type of the first shut-off valve 61 can be determined according to actual needs, and this application embodiment does not limit it. In some examples, the first shut-off valve 61 may have a first valve port, a second valve port, and a third valve port. The first valve port is connected to the connecting pipe between the throttling device 40 and the heat exchange main pipe 51, the second valve port is connected to the outlet, and the third valve port is connected to the suction port of the compressor 10; for example, the first valve port may be connected to the connecting pipe between the second throttling assembly 42 and the heat exchange main pipe 51. In this way, the opening and closing of the bypass flow path 60 and the gas-liquid separation function of the flash evaporator 70 can be controlled by the first shut-off valve 61 respectively, realizing the switching between different operating states. Specifically, when the air conditioner 1 is in normal heating mode, the first shut-off valve 61 can control the first valve port to be closed and the second and third valve ports to be open, so that the gaseous refrigerant separated by the flash evaporator 70 can return to the suction port of the compressor 10 through the second and third valve ports; when the air conditioner 1 is in rapid heating mode, the first shut-off valve 61 can control the first and third valve ports to be open, so that all or at least most of the refrigerant discharged from the compressor 10 flows through the indoor heat exchanger 30 and the throttling device 40 and then returns to the compressor 10 through the bypass flow path 60, achieving a rapid heating effect; when the air conditioner 1 is in cooling mode, the first shut-off valve 61 can control the first, second, and third valve ports to remain closed.

[0038] In some embodiments, the air conditioner 1 may have a split-type structure, including an outdoor unit 101 and an indoor unit 102. The outdoor unit 101 is provided with a compressor 10, a four-way valve 20, an outdoor heat exchanger 50, a bypass flow path 60, a first refrigerant connection terminal 1011 and a second refrigerant connection terminal 1012, and the first refrigerant connection terminal 1011, the indoor heat exchanger 30 and the second refrigerant connection terminal 1012 are connected in sequence.

[0039] In some examples, the first refrigerant connection 1011 can be a two-way shut-off valve, and the second refrigerant connection 1012 can be a three-way shut-off valve to achieve refrigerant shut-off and flow exchange between the outdoor unit 101 and the indoor unit 102.

[0040] In some examples, the air conditioner 1 may also include a first refrigerant pipe 103 and a second refrigerant pipe 104. The first refrigerant connection terminal 1011 is connected to the indoor heat exchanger 30 through the first refrigerant pipe 103, and the second refrigerant connection terminal 1012 is connected to the indoor heat exchanger 30 through the second refrigerant pipe 104.

[0041] In some examples, the first throttling component 41 can be installed in the indoor unit 102, and the second throttling component 42 can be installed in the outdoor unit 101. In this way, when heating in a low-temperature environment, the refrigerant can be throttled by the second throttling component 42 after entering the outdoor unit 101, thereby improving the heat exchange effect of the outdoor heat exchanger 50.

[0042] In some embodiments, the air conditioner 1 may be provided with an external ambient temperature sensor 81 and an external pipe temperature sensor 82. The external ambient temperature sensor 81 is used to measure the outdoor ambient temperature, and the external pipe temperature sensor 82 is disposed on the outdoor heat exchanger 50 and is used to measure the temperature of the outdoor heat exchanger 50.

[0043] In some embodiments, the air conditioner 1 may be provided with an inner ambient temperature sensor 91 and an inner pipe temperature sensor 92. The inner ambient temperature sensor 91 is located at the indoor return air vent of the air conditioner 1 and is used to measure the indoor return air temperature. The inner pipe temperature sensor 92 is located on the indoor heat exchanger 30 and is used to measure the temperature of the indoor heat exchanger 30.

[0044] The outdoor unit and air conditioner provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An air conditioner, characterized in that, include: The refrigeration cycle includes a compressor, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger. The four-way valve is connected to the discharge port of the compressor, the suction port of the compressor, the indoor heat exchanger, and the outdoor heat exchanger, respectively. The indoor heat exchanger, the throttling device, and the outdoor heat exchanger are connected in series. The bypass flow path is connected at one end to the connecting pipe between the throttling device and the outdoor heat exchanger, and at the other end to the suction port of the compressor. A first shut-off valve is provided on the bypass flow path.

2. The air conditioner according to claim 1, characterized in that, The throttling device includes a first throttling component and a second throttling component. The first throttling component includes a first throttling valve and a first one-way valve connected in parallel. The second throttling component includes a second throttling valve and a second one-way valve connected in parallel. The indoor heat exchanger, the first throttling component, the second throttling component, and the outdoor heat exchanger are connected in series. When the air conditioner is cooling, the first one-way valve is closed and the second one-way valve is open. When the air conditioner is heating, the first one-way valve is open and the second one-way valve is closed.

3. The air conditioner according to claim 2, characterized in that, The second throttling assembly also includes a third one-way valve, which is connected in series with the second throttling valve and in parallel with the second one-way valve; when the air conditioner is cooling, the third one-way valve is closed; when the air conditioner is heating, the third one-way valve is open.

4. The air conditioner according to claim 1, characterized in that, The air conditioner also includes a flash evaporator, which has a liquid inlet, a liquid outlet, and an air outlet; the outdoor heat exchanger includes a heat exchange main pipe, a distributor, and multiple heat exchange branch pipes, the distributor has a manifold and multiple branch ports, the throttling device, the heat exchange main pipe, the liquid inlet, the liquid outlet, and the manifold are connected in sequence, the multiple branch ports and the multiple heat exchange branch pipes are connected one-to-one, and the air outlet is connected to the suction port of the compressor.

5. The air conditioner according to claim 4, characterized in that, The first shut-off valve has a first valve port, a second valve port, and a third valve port. The first valve port is connected to the connecting pipe between the throttling device and the heat exchange main pipe. The second valve port is connected to the outlet port, and the third valve port is connected to the suction port of the compressor.

6. The air conditioner according to claim 1, characterized in that, The air conditioner includes an outdoor unit and an indoor unit. The outdoor unit is equipped with the compressor, the four-way valve, the outdoor heat exchanger, the bypass flow path, the first refrigerant connection terminal, and the second refrigerant connection terminal. The first refrigerant connection terminal, the indoor heat exchanger, and the second refrigerant connection terminal are connected in sequence.

7. The air conditioner according to claim 6, characterized in that, The first refrigerant connection end is a two-way shut-off valve, and the second refrigerant connection end is a three-way shut-off valve.

8. The air conditioner according to claim 6, characterized in that, The air conditioner also includes a first refrigerant pipe and a second refrigerant pipe. The first refrigerant connection end is connected to the indoor heat exchanger through the first refrigerant pipe, and the second refrigerant connection end is connected to the indoor heat exchanger through the second refrigerant pipe.

9. The air conditioner according to claim 1, characterized in that, The air conditioner is equipped with an external pipe temperature sensor and an external ambient temperature sensor. The external pipe temperature sensor is installed on the outdoor heat exchanger and is used to measure the temperature of the outdoor heat exchanger. The external ambient temperature sensor is used to measure the outdoor ambient temperature.

10. The air conditioner according to claim 1, characterized in that, The air conditioner is equipped with an inner pipe temperature sensor and an inner ambient temperature sensor. The inner pipe temperature sensor is installed on the indoor heat exchanger and is used to measure the temperature of the indoor heat exchanger. The inner ambient temperature sensor is installed at the indoor return air vent of the air conditioner and is used to measure the indoor return air temperature.

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