Air conditioner

Abstract

The invention provides an air conditioner which comprises a refrigerant loop, a compressor, a condenser, a throttling device and an evaporator. In the refrigeration mode, the condenser is an outdoor heat exchanger, and the outdoor heat exchanger comprises a first heat exchange part and a second heat exchange part. The second heat exchange part is communicated with the first heat exchange part in parallel; the first temperature sensor and the second temperature sensor are respectively used for detecting refrigerant temperatures at refrigerant outlets of the first heat exchange part and the second heat exchange part in a refrigeration mode; the throttling device comprises a first expansion valve and a second expansion valve which are respectively arranged at refrigerant outlets of the first heat exchange part and the second heat exchange part; the controller is configured to adjust the opening degree of the first expansion valve and the opening degree of the second expansion valve according to the temperature difference value between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor so that the temperature difference value can be reduced, and the temperature T1 and the temperature T2 can be homogenized; and therefore, the supercooling degree at the refrigerant outlets of the first heat exchange part and the second heat exchange part is uniform.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner. Background Art

[0002] An air conditioner generally refers to a device that uses artificial means to adjust and control parameters such as the temperature, humidity, and flow rate of the air in a regulated room. An air conditioner usually includes a refrigerant circuit. In the refrigerant circuit, the refrigerant circulates successively through a compressor, a condenser, a throttling device, and an evaporator to achieve refrigeration and heating. Among them, one of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger. When the air conditioner operates in the cooling mode, the refrigerant at the refrigerant outlet of the outdoor heat exchanger serving as the condenser is in a subcooled liquid state.

[0003] In order to improve the heat exchange efficiency of the outdoor heat exchanger and reduce the flow rate and pressure loss, the outdoor heat exchanger is usually configured with multiple refrigerant flow paths for heat exchange. Referring to Figure 1 , the outdoor heat exchanger is configured with multiple refrigerant flow paths in its own height direction (vertical direction). In this outdoor heat exchanger, as the refrigerant flow path at the lower part of the outdoor heat exchanger, due to the influence of gravity, there is a tendency for the subcooling degree to become higher. As a result, the subcooling degrees at the refrigerant outlets of the respective refrigerant flow paths are uneven, affecting the refrigeration efficiency of the outdoor heat exchanger. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this reason,

[0005] According to an embodiment of the present disclosure, there is provided an air conditioner, which includes:

[0006] A refrigerant circuit, in which the refrigerant circulates successively through a compressor, a condenser, a throttling device, and an evaporator;

[0007] In the cooling mode, the condenser is an outdoor heat exchanger, and the outdoor heat exchanger includes:

[0008] A first heat exchange part, having a first refrigerant outlet;

[0009] A second heat exchange part, connected in parallel with the first heat exchange part, and the second heat exchange part has a second refrigerant outlet;

[0010] A first temperature sensor, detecting the refrigerant temperature at the first refrigerant outlet in the cooling mode;

[0011] A second temperature sensor, detecting the refrigerant temperature at the second refrigerant outlet in the cooling mode;

[0012] The throttling device includes:

[0013] The first expansion valve is disposed at the first refrigerant outlet;

[0014] The second expansion valve is disposed at the second refrigerant outlet;

[0015] The controller is configured to: adjust the opening degrees of the first expansion valve and the second expansion valve according to the temperature difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor.

[0016] In this technical solution, the outdoor heat exchanger is divided into two heat exchange parts from top to bottom. During the refrigeration operation, temperature sensors and expansion valves are disposed at the refrigerant outlets of each heat exchange part. According to the difference between the temperature detected by each temperature sensor and the average temperature, the opening degrees of the first expansion valve and the second expansion valve are adjusted, thereby adjusting the refrigerant flow rates and flows of the first heat exchange part and the second heat exchange part, and reducing the difference between the temperature T1 and the temperature T2. This setting makes the temperature T1 and the temperature T2 uniform, and further makes the subcooling degrees at the refrigerant outlets of the first heat exchange part and the second heat exchange part uniform, avoiding the tendency of the subcooling degree at the lower part of the outdoor heat exchanger to increase due to the influence of gravity, improving the overall heat exchange capacity of the outdoor heat exchanger, and improving the refrigeration capacity of the air conditioner.

[0017] In some embodiments of the present application, adjusting the opening degrees of the first expansion valve and the second expansion valve according to the difference between the temperature T1 and the temperature T2 includes:

[0018] If the temperature T1 is greater than the temperature T2, reduce the opening degree of the first expansion valve and increase the opening degree of the second expansion valve;

[0019] If the temperature T1 is less than the temperature T2, increase the opening degree of the first expansion valve and reduce the opening degree of the second expansion valve.

[0020] In this technical solution, when T1 > T2, by reducing the opening degree of the first expansion valve and increasing the opening degree of the second expansion valve, the refrigerant flow of the first heat exchange part is reduced and the refrigerant flow of the second heat exchange part is increased, narrowing the difference between the temperature T1 and the temperature T2; when T1 < T2, by increasing the opening degree of the first expansion valve and reducing the opening degree of the second expansion valve, the refrigerant flow of the first heat exchange part is increased and the refrigerant flow of the second heat exchange part is reduced, narrowing the difference between the temperature T1 and the temperature T2; by narrowing the difference, the temperature at the refrigerant outlet of the outdoor heat exchanger is made uniform, and the subcooling degree at the refrigerant outlet of the outdoor heat exchanger is made uniform, thereby improving the air-conditioning performance.

[0021] According to an embodiment of the present disclosure, there is also provided an air conditioner, which includes:

[0022] A refrigerant circuit, in which refrigerant circulates successively through a compressor, a condenser, a throttling device, and an evaporator;

[0023] In a refrigeration mode, when the condenser is an outdoor heat exchanger, the outdoor heat exchanger includes:

[0024] A first heat exchange part, having a first refrigerant outlet;

[0025] A second heat exchange part, connected in parallel with the first heat exchange part, the second heat exchange part having a second refrigerant outlet;

[0026] A first temperature sensor, detecting the refrigerant temperature at the first refrigerant outlet in the refrigeration mode;

[0027] A second temperature sensor, detecting the refrigerant temperature at the second refrigerant outlet in the refrigeration mode;

[0028] The throttling device includes:

[0029] A first expansion valve, disposed at the first refrigerant outlet;

[0030] A second expansion valve, the outlet end of the first expansion valve is connected to the second refrigerant outlet and then connected to the second expansion valve through a pipeline;

[0031] A controller, configured to:

[0032] Calculate an average temperature according to the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor;

[0033] Adjust the opening degree of the first expansion valve according to the difference between the temperature T1 and the average temperature.

[0034] In this technical solution, the outdoor heat exchanger is divided into a first heat exchange part and a second heat exchange part from top to bottom, and during refrigeration operation, according to the difference between the refrigerant temperature at the first refrigerant outlet and the average temperature of the refrigerant temperatures at the first refrigerant outlet and the second refrigerant outlet, the opening degree of the first expansion valve is adjusted, thereby adjusting the refrigerant flow rate and flow volume of the first heat exchange part, and reducing the difference between the temperature T1 and the temperature T2. This setting makes the temperature T1 and the temperature T2 uniform, and further makes the subcooling degrees at the refrigerant outlets of the first heat exchange part and the second heat exchange part uniform, avoiding the tendency of the subcooling degree at the lower part of the outdoor heat exchanger to increase due to the influence of gravity, improving the overall heat exchange capacity of the outdoor heat exchanger, and improving the refrigeration capacity of the air conditioner.

[0035] According to an embodiment of the present disclosure, there is also provided an air conditioner, which includes:

[0036] A housing, on which an outdoor air inlet and an outdoor air outlet are formed;

[0037] The outdoor heat exchanger is disposed in the outdoor air duct and is used for heat exchange with the air in the machine housing. The outdoor heat exchanger includes:

[0038] In the refrigeration mode, the condenser is the outdoor heat exchanger, and the outdoor heat exchanger includes:

[0039] A plurality of heat exchange parts are arranged in sequence from top to bottom along the height direction of the outdoor heat exchanger. The plurality of heat exchange parts are connected in parallel and communicate with each other. The heat exchanger has a refrigerant outlet;

[0040] A plurality of temperature sensors are arranged in one-to-one correspondence with the plurality of heat exchange parts. The temperature sensors are used to detect the refrigerant temperature at the corresponding refrigerant outlet in the refrigeration mode;

[0041] The throttling device includes a plurality of expansion valves. The plurality of expansion valves are arranged at the refrigerant outlets of the plurality of heat exchange parts in one-to-one correspondence. In the refrigeration mode, the refrigerant in the outdoor heat exchanger can flow out through the plurality of expansion valves;

[0042] The controller is electrically connected to the expansion valve, and the controller is configured as:

[0043] Calculate the average temperature at the refrigerant outlet of the heat exchange part according to the temperature detected by each temperature sensor;

[0044] Adjust the opening degree of each expansion valve corresponding to the temperature sensor according to the difference between the temperature detected by each temperature sensor and the average temperature.

[0045] In this technical solution, during refrigeration operation, the outdoor heat exchanger serves as a condenser. By dividing the outdoor heat exchanger into a plurality of heat exchange parts from top to bottom and arranging temperature sensors and expansion valves at the refrigerant outlets of each heat exchange part, the opening degree of each expansion valve corresponding to the temperature sensor is adjusted according to the difference between the temperature detected by each temperature sensor and the average temperature, thereby adjusting the refrigerant flow rate of each heat exchange part, solving the problem of uneven subcooling degree caused by gravity, improving the heat exchange capacity of the outdoor heat exchanger, and further improving the refrigeration capacity of the air conditioner.

[0046] In some embodiments of the present application, adjusting the opening degree of each expansion valve corresponding to the temperature sensor according to the difference includes:

[0047] If the temperature Ti is greater than the average temperature, reduce the opening degree of the expansion valve corresponding to the temperature Ti;

[0048] If the temperature Ti is less than the average temperature, increase the opening degree of the expansion valve corresponding to the temperature Ti;

[0049] The temperature Ti is the temperature detected by the ith temperature sensor, where i = 1, ……, n, and n ≥ 2.

[0050] In this technical solution, when the temperature Ti is greater than or less than the average temperature respectively, the opening degree of the corresponding expansion valve is adjusted to achieve opening degree compensation, thereby making the temperatures detected by multiple sensors uniform and achieving uniform subcooling degree.

[0051] In some embodiments of the present application, the controller is further configured to: if the temperature Ti is equal to the average temperature, control the opening degree of the expansion valve corresponding to the temperature Ti to remain unchanged; when the temperature Ti is equal to the average temperature, there is no need to perform compensation processing on the opening degree of the expansion valve.

[0052] In some embodiments of the present application, the controller is further configured to: determine the opening degree of the expansion valve before adjustment according to the control of the target discharge pipe temperature.

[0053] In some embodiments of the present application, in the refrigeration mode, a plurality of distributors are connected to the refrigerant outlet end of the outdoor heat exchanger to divide the outdoor heat exchanger into a plurality of heat exchange parts from top to bottom along its height direction. The distributors, the temperature sensors, and the expansion valves are arranged in sequence along the refrigerant flow direction; this setting realizes the uniform subcooling degree of the refrigerant at the position of the temperature sensor at the refrigerant outlet of the distributor, avoids setting too many temperature sensors and expansion valves, and reduces costs.

[0054] In some embodiments of the present application, the number of heat transfer tubes corresponding to the plurality of heat exchange parts is the same, and the height ratios of the plurality of heat exchange parts occupying the outdoor heat exchanger are the same; this setting enables the outdoor heat exchanger to be divided at positions where the heat transfer tube volume and its height dimension are equal, effectively solving the problem of uneven subcooling degree caused by the influence of gravity.

[0055] In some embodiments of the present application, the outdoor heat exchanger has a plurality of refrigerant flow paths, and the plurality of refrigerant flow paths divide the outdoor heat exchanger into a plurality of heat exchange parts from top to bottom in one-to-one correspondence along its height direction; this setting enables the outdoor heat exchanger to be divided according to the refrigerant flow paths, realizes the uniformity of the temperature and subcooling degree at the outlet of each refrigerant flow path in the outdoor heat exchanger, and effectively suppresses the fluctuation of the subcooling degree in all refrigerant flow paths of the outdoor heat exchanger. Description of the Drawings

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0057] Figure 1 is a schematic diagram of the outdoor heat exchanger and its corresponding subcooling degree in the prior art;

[0058] Figure 2 is a structural block diagram of an air conditioner according to an embodiment of the present disclosure;

[0059] Figure 3 is a system block diagram of an air conditioner according to an embodiment of the present disclosure;

[0060] Figure 4 is a schematic structural diagram of a refrigerant circuit according to an embodiment of the present disclosure;

[0061] Figure 5 is a schematic structural diagram of an outdoor heat exchanger according to an embodiment of the present disclosure;

[0062] Figure 6 is Figure 5 a schematic diagram of the subcooling degree corresponding to the outdoor heat exchanger in

[0063] Figure 7 is a hardware configuration block diagram of an air conditioner according to an embodiment of the present disclosure;

[0064] Figure 8 is a control logic for subcooling degree homogenization at the outlet of an outdoor heat exchanger according to an embodiment of the present disclosure;

[0065] Figure 9 is a schematic diagram of the structure of an outdoor heat exchanger and its subcooling degree according to an embodiment of the present disclosure Figure 1 ;

[0066] Figure 10 is a schematic diagram of the structure of an outdoor heat exchanger and its subcooling degree according to an embodiment of the present disclosure Figure 2 ;

[0067] Figure 11 is Figure 10 a schematic diagram of the refrigerant flow path in

[0068] Figure 12 is a control logic of an air conditioner according to an embodiment of the present disclosure;

[0069] Figure 13 is a schematic structural diagram of an outdoor heat exchanger according to another embodiment of the present disclosure;

[0070] Figure 14 is a control logic for subcooling degree homogenization at the outlet of an outdoor heat exchanger according to another embodiment of the present disclosure;

[0071] Figure 15 is a control logic for opening compensation of an expansion valve according to another embodiment of the present disclosure;

[0072] Figure 16 is a schematic diagram of the structure of an outdoor heat exchanger and its subcooling degree according to another embodiment of the present disclosure;

[0073] Figure 17 is the control logic for subcooling degree homogenization at the outlet of the outdoor heat exchanger according to another embodiment of the present disclosure;

[0074] Figure 18 is the control logic for opening compensation of the expansion valve according to another embodiment of the present disclosure;

[0075] Figure 19 is the control logic for the expansion valve of the air conditioner according to another embodiment of the present disclosure;

[0076] Figure 20 is a schematic diagram of the structure of an outdoor heat exchanger according to still another embodiment of the present disclosure;

[0077] Figure 21 is the control logic for the air conditioner according to an embodiment of the present disclosure.

[0078] In each of the above figures: air conditioner 100; outdoor unit 1; indoor unit 2; controller 3; refrigerant circuit 4; compressor 41; outdoor heat exchanger 42; expansion valve 43; first expansion valve 431; second expansion valve 432; indoor heat exchanger 44; four-way valve 45; heat exchange part 5; first heat exchange part 51; second heat exchange part 52; heat transfer pipe 53; temperature sensor 6; first temperature sensor 61; second temperature sensor 62; diverter 7; Detailed Embodiment

[0079] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described and explained below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided in the present application without making creative efforts fall within the scope of protection of the present application.

[0080] Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, the present application can also be applied to other similar scenarios based on these drawings without making creative efforts. In addition, it can also be understood that although the efforts made in this development process may be complex and time-consuming, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacturing or production changes based on the technical content disclosed in the present application are only conventional technical means and should not be understood as the content disclosed in the present application being insufficient.

[0081] References herein to "embodiments" mean that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and is not necessarily referring to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those of ordinary skill in the art will explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments without conflict.

[0082] As used herein, terms such as "connected", "coupled", and "joined" do not necessarily refer to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used herein, "a plurality of" means two or more. "And / or" describes the relationship between associated objects and indicates that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates an "or" relationship between the associated objects before and after. As used herein, the terms "first", "second", "third", etc. are only used to distinguish similar objects and do not represent a specific order for the objects.

[0083] Referring Figures 2 to 17 , an embodiment of the present application provides an air conditioner 100, which includes an indoor unit 2 and an outdoor unit 1. The indoor unit 2 and the outdoor unit 1 can be configured as an integrated unit or a split unit.

[0084] The air conditioner can be configured as a wall-mounted type, a floor-standing type, a ceiling type, a duct type, etc. Among them, the indoor unit 2 is installed indoors and is used for heat exchange with the indoor environment. The outdoor unit 1, usually installed outdoors, is used to transfer the indoor heat outdoors.

[0085] The indoor unit includes a housing, and the housing forms the appearance of the indoor unit.

[0086] An air inlet and an air outlet are formed on the housing. The interior of the housing is in communication with the air inlet so that indoor air can enter the housing through the air inlet; the interior of the housing is in communication with the air outlet, and the air outlet is in communication with the interior of the room so that the conditioned air in the housing can flow out of the air outlet into the room.

[0087] The indoor unit may include an indoor heat exchanger 44. The indoor heat exchanger 44 is disposed inside the housing and is used for heat exchange with the air entering the housing.

[0088] The indoor unit may include an indoor fan. The indoor fan is disposed inside the housing and is used to drive the indoor air outside the housing to enter the housing through the air inlet. The indoor fan drives the air inside the housing to flow from the air inlet towards the air outlet, and the air inside the housing is sent out through the air outlet after heat exchange by the indoor heat exchanger 44.

[0089] The air conditioner 100 includes a refrigerant circuit 4. Refer to Figure 3 , Figure 4 the schematic structural diagram of the refrigerant circuit 4 shown. By circulating the refrigerant in the refrigerant circuit 4, indoor cooling or heating cycles can be executed. A connecting pipe is used to connect the indoor unit 2 and the outdoor unit 1 to form a refrigerant circuit for the refrigerant to circulate.

[0090] The air conditioner 100 circulates the refrigerant in a circuit composed of a compressor 41, a condenser 42, a throttling device 43, and an evaporator 44 through the refrigerant circuit. One of the evaporator and the condenser is the indoor heat exchanger 44, and the other is the outdoor heat exchanger 42. The outdoor heat exchanger 42 is disposed in the outdoor unit, and the outdoor heat exchanger 42 is used for heat exchange with the air inside the outdoor unit, thereby realizing the cooling or heating requirements of the air conditioner.

[0091] The outdoor unit 1 may include a compressor 41. The compressor 41 is used to compress the refrigerant gas in a low-temperature and low-pressure state into a refrigerant gas in a high-temperature and high-pressure state, and discharge the compressed refrigerant gas to the condenser.

[0092] The outdoor unit 1 may include an outdoor fan. The outdoor fan generates an air flow of the outdoor air passing through the outdoor heat exchanger 42 to promote the heat exchange between the refrigerant flowing in the outdoor heat exchanger 42 and the outdoor air. Among them, the outdoor fan is driven by a driving device capable of changing the rotation speed.

[0093] The air conditioner 100 may include a throttling device. The throttling device is disposed in the indoor unit 2 or the outdoor unit 1, and the throttling device is used for throttling under a cooling condition or a heating condition. In this embodiment, the throttling device is disposed in the outdoor unit 1.

[0094] The air conditioner 100 may include a four-way valve. The four-way valve 45 is disposed in the outdoor unit to change the flow direction of the refrigerant in the refrigerant circuit 4.

[0095] The air conditioner 100 has a cooling mode and a heating mode.

[0096] In the cooling mode, the indoor heat exchanger 44 is an evaporator, the outdoor heat exchanger 42 is a condenser, and the refrigerant circulates in sequence through the compressor, the outdoor heat exchanger 42, the throttling device, and the indoor heat exchanger 44.

[0097] In the heating mode, the indoor heat exchanger 44 is a condenser and the outdoor heat exchanger 42 is an evaporator, and the refrigerant circulates in sequence through the compressor, the indoor heat exchanger 44, the throttling device, and the outdoor heat exchanger 42.

[0098] Refer to Figure 3, the air conditioner 100 further includes a controller 3. The controller 3 is electrically connected to the indoor unit 2 and the outdoor unit 1 to control the operation of various components inside them, so that each component of the air conditioner 100 operates to achieve various predetermined functions of the air conditioner 100.

[0099] In the embodiment shown in the present application, the controller 3 refers to a device that can generate operation control signals according to instruction operation codes and timing signals to instruct the air conditioner to execute control instructions. For example, in response to the power-on or power-off instructions issued by the user received, the controller 3 can execute operations related to the object selected by the power-on or power-off instructions.

[0100] When the air conditioner is operating in the cooling mode or the dehumidifying mode, the refrigerant at the refrigerant outlet of the outdoor heat exchanger 42 acting as a condenser is in a subcooled liquid state. In the related art, in order to improve the heat exchange efficiency of the outdoor heat exchanger 42 and reduce the flow rate and pressure loss, the outdoor heat exchanger 42 is usually configured with multiple refrigerant flow paths for heat exchange.

[0101] Reference Figure 1 , the outdoor heat exchanger 42 is configured with multiple refrigerant flow paths in its own height direction (vertical direction). In this outdoor heat exchanger 42, as the refrigerant flow path at the lower part of the outdoor heat exchanger 42, due to the influence of gravity, there is a tendency for the subcooling degree to become higher, resulting in uneven subcooling degrees at the refrigerant outlets of each refrigerant flow path, which affects the refrigeration efficiency of the outdoor heat exchanger 42.

[0102] To solve the above technical problems, in this embodiment, the outdoor heat exchanger 42 is divided into two heat exchange parts 5 up and down, and in the cooling mode, a temperature sensor 6 and an expansion valve 43 are installed at the refrigerant outlets of the two heat exchange parts 5 respectively. Reference Figure 7 , the temperature sensor 6 is communicatively connected to the controller, and sends the detected temperature information to the controller. The controller automatically performs the opening adjustment action of the expansion valve 43 for flow regulation according to the temperature information, effectively reducing the unevenness of the subcooling degree and improving the refrigeration capacity of the outdoor heat exchanger 42.

[0103] In some embodiments of the present application, the outdoor heat exchanger 42 includes a first heat exchanger 51. In the cooling mode, the first heat exchanger 51 has a first refrigerant outlet.

[0104] In some embodiments of the present application, the outdoor heat exchanger 42 includes a second heat exchanger 52. In the cooling mode, the second heat exchanger 52 has a first refrigerant outlet.

[0105] The second heat exchanger 52 is located above the first heat exchanger 51, and the second heat exchanger 52 is connected in parallel with the first heat exchanger 51.

[0106] In some embodiments of the present application, the outdoor heat exchanger 42 includes a first temperature sensor 61. The first temperature sensor 61 is used to detect the refrigerant temperature at the first refrigerant outlet in the refrigeration mode.

[0107] In some embodiments of the present application, the outdoor heat exchanger 42 includes a second temperature sensor 62. The second temperature sensor 62 is used to detect the refrigerant temperature at the second refrigerant outlet in the refrigeration mode.

[0108] The first temperature sensor 61 and the second temperature sensor 62 are communicatively connected to the controller, so that the first temperature sensor 61 and the second temperature sensor 62 transmit temperature data information to the controller 3.

[0109] It should be noted that the degree of subcooling generally refers to the difference between the saturation temperature corresponding to the refrigerant pressure at a certain point at the condenser outlet and the actual refrigerant temperature. Therefore, setting the temperature sensor at the refrigerant outlet position can effectively grasp the degree of subcooling.

[0110] The first temperature sensor 61 and the second temperature sensor 62 detect the refrigerant temperature, and the refrigerant temperature at the refrigerant outlet of the heat exchange part is generally replaced by the wall temperature at the refrigerant outlet. Therefore, the first temperature sensor 61 and the second temperature sensor 62 are respectively installed on the outer walls of the refrigerant outlets of the first heat exchange part 51 and the second heat exchange part 52.

[0111] In some embodiments of the present application, the throttling device is an expansion valve 43.

[0112] In some embodiments of the present application, the throttling device includes a first expansion valve 431. In the refrigeration mode, the first expansion valve 431 is arranged at the first refrigerant outlet of the first heat exchange part 51.

[0113] In some embodiments of the present application, the throttling device includes a second expansion valve 432. In the refrigeration mode, the second expansion valve 432 is arranged at the second refrigerant outlet of the second heat exchange part 52.

[0114] In the refrigeration mode, the first expansion valve 431 is arranged at the first refrigerant outlet, and the second expansion valve 432 is arranged at the second refrigerant outlet, so that the refrigerant in the outdoor heat exchanger 42 flows out through the first expansion valve 431 and the second expansion valve 432.

[0115] Both the first expansion valve 431 and the second expansion valve 432 are electrically connected to the controller 3, so that the controller 3 controls their opening degrees to adjust the refrigerant flow rate.

[0116] The controller is configured to: adjust the opening degrees of the first expansion valve 431 and the second expansion valve 432 according to the temperature difference between the temperature T1 detected by the first temperature sensor 61 and the temperature T2 detected by the second temperature sensor 62, so as to reduce the temperature difference between the temperature T1 and the temperature T2.

[0117] The air conditioner provided by the embodiment of the present disclosure divides the outdoor heat exchanger 42 into two heat exchange parts 5 from top to bottom, and when operating in refrigeration, temperature sensors and expansion valves are arranged at the refrigerant outlets of the two heat exchange parts 5.

[0118] According to the difference between the temperatures T1 and T2 detected by the two temperature sensors, the opening degrees of the first expansion valve 431 and the second expansion valve 432 are adjusted. Furthermore, the refrigerant flow rates and flows in the first heat exchange part 51 and the second heat exchange part 52 are adjusted. By increasing the opening degree compensation of the expansion valve, the temperature compensation is increased, the gap between the temperature T1 and the temperature T2 is reduced, the correction process for equalizing the refrigerant temperature at the refrigerant outlets of the two heat exchange parts is realized, the subcooling degrees at the refrigerant outlets of the two heat exchange parts are also equalized, and the overall heat exchange capacity of the outdoor heat exchanger 42 is improved.

[0119] Reference Figure 6 , which is a subcooling degree schematic diagram under the structure of the outdoor heat exchanger in this embodiment. It can be seen from the figure that the subcooling degree of the lower path of the outdoor heat exchanger is reduced, effectively suppressing the fluctuation of the subcooling degree in the refrigerant flow path.

[0120] Specifically, the control process for equalizing the subcooling degree at the outlet of the outdoor heat exchanger 42 refers to Figure 8 , which includes:

[0121] S01, obtaining the temperature T1 detected by the first temperature sensor 61 and the temperature T2 detected by the second temperature sensor 62;

[0122] S02, according to the temperature difference between the temperature T1 and the temperature T2, adjusting the opening degrees of the first expansion valve 431 and the second expansion valve 432, so as to reduce the temperature difference between the temperature T1 and the temperature T2.

[0123] In some embodiments of the present application, adjusting the opening degrees of the first expansion valve 431 and the second expansion valve 432 according to the difference between the temperature T1 and the temperature T2 includes the following steps:

[0124] If the temperature T1 is greater than the temperature T2, reduce the opening degree of the first expansion valve 431 and increase the opening degree of the second expansion valve 432;

[0125] If the temperature T1 is less than the temperature T2, increase the opening degree of the first expansion valve 431 and reduce the opening degree of the second expansion valve 432.

[0126] Specifically, when T1 > T2, the temperature T1 at the refrigerant outlet of the first heat exchange part 51 is relatively higher than the temperature T2 at the refrigerant outlet of the second heat exchange part 52, and the refrigerant temperatures at the refrigerant outlets of the first heat exchange part 51 and the second heat exchange part 52 are uneven, resulting in uneven subcooling degrees.

[0127] To reduce the unevenness of the subcooling degree, the opening degree of the first expansion valve 431 is reduced. This setting increases the refrigerant flow rate of the first heat exchange part 51, causing the temperature at the refrigerant outlet of the first heat exchange part 51 to decrease, and thus increasing the subcooling degree at the refrigerant outlet of the first heat exchange part 51.

[0128] At the same time, the opening degree of the second expansion valve 432 is increased. This setting reduces the refrigerant flow rate of the second heat exchange part 52, causing the temperature at the refrigerant outlet of the second heat exchange part 52 to increase, and thus reducing the subcooling degree at the refrigerant outlet of the second heat exchange part 52.

[0129] When T1 < T2, by increasing the opening degree of the first expansion valve 431 and reducing the opening degree of the second expansion valve 432, the refrigerant flow rate of the first heat exchange part 51 is increased and the refrigerant flow rate of the second heat exchange part 52 is reduced. As a result, the temperature at the first refrigerant outlet is increased and the temperature at the second refrigerant outlet is reduced, narrowing the temperature difference between temperature T1 and temperature T2.

[0130] By narrowing the temperature difference, the temperature at the refrigerant outlet of the outdoor heat exchanger 42 is made uniform, and the subcooling degree at the refrigerant outlet of the outdoor heat exchanger 42 is homogenized, thereby improving the performance of the air conditioner.

[0131] In this embodiment, according to the temperature difference between temperature T1 and temperature T2, the opening degrees of the first expansion valve 431 and the second expansion valve 432 are corrected and compensated, so as to add temperature compensation to the temperatures at the refrigerant outlets detected by the two temperature sensors, make their temperatures uniform, and further make the subcooling degrees uniform, effectively suppressing the fluctuation of the subcooling degree in the refrigerant flow path of the outdoor heat exchanger 42.

[0132] It should be noted that the subcooling degree at the location of the first temperature sensor 61 is SC1, and the subcooling degree at the location of the second temperature sensor 62 is SC2. The formulas for SC1 and SC2 are as follows:

[0133] SC1 = T 中 - T1;

[0134] SC2 = T 中 - T2;

[0135] Wherein, T 中is the intermediate temperature of the outdoor heat exchanger 42. If the detected temperatures of the first temperature sensor 61 and the second temperature sensor 62 are uneven, the subcooling degrees (SC1, SC2) are also uneven. If the detected temperatures of the first temperature sensor 61 and the second temperature sensor 62 are uniform, the subcooling degrees (SC1, SC2) are also uniform.

[0136] As can be seen from the above formula, as long as the temperature difference between the temperature T1 and the temperature T2 is known, the uniform correction process of the subcooling degree can be realized, and the intermediate temperature of the outdoor heat exchanger 42 does not need to be detected.

[0137] Reference Figures 9 to 11 , in some embodiments of the present application, the first heat exchange part 51 has at least one refrigerant flow path.

[0138] In some embodiments of the present application, the second heat exchange part 52 has at least one refrigerant flow path.

[0139] In some embodiments of the present application, the corresponding refrigerant flow paths in the first heat exchange part 51 and the second heat exchange part 52 are the same.

[0140] When the first heat exchange part 51 and the second heat exchange part 52 each have multiple refrigerant flow paths, the outdoor heat exchanger 42 is divided into the first heat exchange part 51 and the second heat exchange part 52 from top to bottom along its height direction by two distributors 7. One distributor 7 is arranged in sequence with the first temperature sensor 61 and the first expansion valve 431 along the refrigerant flow direction, and the other distributor 7 is arranged in sequence with the second temperature sensor 62 and the second expansion valve 432 along the refrigerant flow direction.

[0141] Continue to refer to Figure 9 , which is a four-way heat exchanger. Among them, the outdoor heat exchanger 42 has four refrigerant flow paths, which are A to D from top to bottom. Before the compensation process is added to the outdoor heat exchanger 42, the relationship between the respective subcooling degrees is: A < B < B < D.

[0142] After the compensation process is added, the relationship between the subcooling degrees is: A ≈ C < B ≈ D. After the subcooling degrees are homogenized, the reduction of the subcooling degrees of C and D is homogenized. After the subcooling degrees are homogenized, the heat exchange capacity of the outdoor heat exchanger 42 is improved, so that the outdoor heat exchanger 42 can work effectively, and the capacity of the air conditioning system is improved.

[0143] Furthermore, refer to Figure 10 , the number of heat transfer tubes 53 corresponding to each heat exchange part 5 is the same, and the height ratio of each heat exchange part 5 to the outdoor heat exchanger 42 is the same. That is to say, refer to Figure 10 , the height dimension h1 of the first heat exchange part is the same as the height dimension h2 of the second heat exchange part.

[0144] In this embodiment, the number of heat transfer tubes 53 of each heat exchange part 5 and their corresponding height ratios are the same, so that the outdoor heat exchanger 42 is divided at a position where the volume and height dimensions of the heat transfer tubes 53 are equalized, making the subcooling degree at the refrigerant outlet of the outdoor heat exchanger 42 more uniform, effectively solving the problem of uneven subcooling degree caused by the influence of gravity.

[0145] In some embodiments of the present application, the controller 3 is further configured to: determine the opening degrees of the first expansion valve and the second expansion valve before adjustment according to the target discharge pipe temperature control.

[0146] Reference Figure 12 , which is a control flow chart for equalizing the subcooling degree at the outlet of the outdoor heat exchanger 42 in the refrigeration mode. Specifically:

[0147] When the air conditioner is running, according to the target discharge pipe temperature control, determine the opening degrees of the first expansion valve 431 and the second expansion valve 432 (step S1), obtain the temperature T1 detected by the first temperature sensor 61 and the temperature T2 detected by the second temperature sensor 62 (step S2), and determine whether the temperature T1 is greater than the temperature T2 (step S3).

[0148] If so (T1>T2), then execute step S4: reduce the opening degree of the first expansion valve 431 and increase the opening degree of the second expansion valve 432; if not, under this condition, determine whether the temperature T1 is less than the temperature T2 (step S5). If so (T1<T2), then execute step S6: increase the opening degree of the first expansion valve 431 and reduce the opening degree of the second expansion valve 432.

[0149] Otherwise, when T1 = T2, there is no compensation operation. At this time, the temperatures detected by the two temperature sensors are uniform, and there is no need to correct the opening degrees of the first expansion valve 431 and the second expansion valve 432, that is, keep the opening degrees unchanged.

[0150] The target discharge pipe temperature control is a prior art. For reference, a brief description of the "target discharge pipe temperature control" is given. The target discharge pipe temperature control includes:

[0151] ① Use a temperature detection device to measure the temperature at the middle position of the heat transfer tubes of the indoor heat exchanger and the temperature at the middle position of the heat transfer tubes of the outdoor heat exchanger respectively, and calculate the optimal control point "target discharge pipe temperature Tdset" according to the two detected temperatures of the temperature detection device. ※ The calculation formula cannot be confirmed as the control specification is unclear.

[0152] ② Measure the temperature of the compressor discharge pipeline and record it as "discharge pipe temperature Td".

[0153] ③ Observe the difference between Tdset and Td of each expansion valve and adjust the opening degree.

[0154] When Tdset > Td... the opening degrees of all the expansion valves decrease.

[0155] When Tdset < Td... the opening degrees of all the expansion valves increase.

[0156] When Tdset = Td, the opening degrees of all the expansion valves are maintained. Usually, there is only one expansion valve mounted on the outdoor unit of the air conditioner, but in this application, there are multiple expansion valves, so "all the expansion valves" is described.

[0157] The above "target discharge pipe temperature control" is the main operation of the expansion valve control in the air conditioner. The opening degree of the expansion valve calculated according to this control is supplemented with a correction control in this application to achieve opening degree compensation.

[0158] In some other embodiments of this application, the throttling device includes a first expansion valve 431. In the refrigeration mode, the first expansion valve 431 is arranged at the first refrigerant outlet of the first heat exchange part 51.

[0159] In some other embodiments of this application, the throttling device includes a second expansion valve 432. Refer to Figure 13 , after the outlet end of the first expansion valve 431 is communicated with the second refrigerant outlet, it is connected to the second expansion valve 432 through a pipeline.

[0160] Refer to Figure 14 , in the above embodiments, the controller 3 is configured to:

[0161] Calculate the average temperature Tave according to the temperature T1 detected by the first temperature sensor 61 and the temperature T2 detected by the second temperature sensor 62;

[0162] Adjust the opening degree of the first expansion valve 431 according to the difference between the temperature T1 and the average temperature.

[0163] In the above embodiments, the opening degree of the first expansion valve 431 is adjusted according to the difference between the detected temperature T1 and the average temperature Tave, and then the refrigerant flow rate and flow volume of the first heat exchange part 51 are adjusted. By increasing the opening degree compensation of the expansion valve and further increasing the temperature compensation, the gap between the temperature T1 and the temperature T2 is narrowed, and the correction process of uniformizing the refrigerant temperature at the refrigerant outlets of the two heat exchange parts is realized, so that the subcooling degrees at the refrigerant outlets of the two heat exchange parts are also uniformized, and the overall heat exchange capacity of the outdoor heat exchanger 42 is improved.

[0164] In some embodiments of this application, refer to Figure 15 , adjust the opening degree of the first expansion valve 431 according to the difference between the temperature T1 and the average temperature, specifically including:

[0165] If the temperature T1 is greater than the average temperature Tave, the opening degree of the first expansion valve 431 can be reduced;

[0166] If the temperature T1 is less than the average temperature Tave, the opening degree of the first expansion valve 431 can be increased.

[0167] Specifically, if the temperature T1 is greater than the average temperature Tave, the opening degree of the first expansion valve 431 can be reduced to perform temperature compensation on the temperature T1 to lower it. If the temperature T1 is less than the average temperature Tave, the opening degree of the first expansion valve 432 can be increased to perform temperature compensation on the temperature T1 to raise it, thereby reducing the temperature difference between the temperature T1 and the temperature T2.

[0168] In this embodiment, when T1 > T2, the opening degree of the first expansion valve 431 can be reduced to lower the temperature T1, thereby reducing the difference between the temperature T1 and the temperature T2 and reducing the non-uniformity of the subcooling degree; when T1 < T2, the opening degree of the first expansion valve 431 can be increased or the temperature T1 can be increased to reduce the difference between the temperature T1 and the temperature T2 and reduce the non-uniformity of the subcooling degree.

[0169] In some embodiments of the present application, according to the difference between the temperature T1 and the average temperature, the opening degree of the first expansion valve 431 is adjusted, including: if the temperature T1 is equal to the average temperature Tave, the opening degree of the first expansion valve 431 is controlled to remain unchanged.

[0170] In some embodiments of the present application, the outdoor heat exchanger 42 includes a plurality of heat exchange parts 5, and the heat exchange part 5 has a refrigerant outlet.

[0171] The plurality of heat exchange parts 5 are arranged in sequence from top to bottom along the height direction of the outdoor heat exchanger 42, and the plurality of heat exchange parts 5 are connected in parallel.

[0172] In some embodiments of the present application, the outdoor heat exchanger 42 includes a plurality of temperature sensors 6. Refer to Figure 16 , the plurality of temperature sensors 6 are arranged in one-to-one correspondence with the plurality of heat exchange parts 5 for detecting the temperature at the refrigerant outlet of the corresponding heat exchange part 5 in the refrigeration mode.

[0173] In some embodiments of the present application, the throttling device includes a plurality of expansion valves. The plurality of expansion valves 43 are arranged at the refrigerant outlets of the plurality of heat exchange parts 5 in one-to-one correspondence, and in the refrigeration mode, the refrigerant in the outdoor heat exchanger 42 can flow out through the plurality of expansion valves 43.

[0174] The number of the heat exchange parts 5 is the same as that of the temperature sensors 6 and the expansion valves. Among them, the number of the heat exchangers is configured to be at least two.

[0175] Refer to Figure 17, the controller is configured to: execute step S7, calculate the average temperature at the refrigerant outlet of the heat exchange part 5 according to the temperatures detected by each temperature sensor 6; after executing step S7, execute step S8, and adjust the opening degrees of the respective expansion valves 43 corresponding to the temperature sensors 6 according to the difference between the temperatures detected by each temperature sensor 6 and the average temperature.

[0176] In this embodiment, the outdoor heat exchanger 42 is divided into multiple heat exchange parts 5 from top to bottom, and temperature sensors 6 and expansion valves 43 are arranged at the refrigerant outlets of the respective heat exchange parts 5. According to the difference between the temperatures detected by each temperature sensor 6 and the average temperature, opening degree compensation is performed on the opening degrees of the respective expansion valves 43 corresponding to the temperature sensors 6, and the refrigerant flow rates of the respective heat exchange parts 5 are adjusted, solving the problem of uneven subcooling degree caused by gravity, improving the heat exchange capacity of the outdoor heat exchanger 42, and further improving the refrigeration capacity of the air conditioner.

[0177] In some other embodiments of the present application, adjusting the opening degrees of the respective expansion valves 43 corresponding to the temperature sensors 6 according to the difference includes:

[0178] If the temperature Ti is greater than the average temperature, reduce the opening degree of the expansion valve corresponding to the temperature Ti;

[0179] If the temperature Ti is less than the average temperature, increase the opening degree of the expansion valve corresponding to the temperature Ti;

[0180] Wherein, the temperature Ti is the temperature detected by the i-th temperature sensor 6, i = 1,..., n, and n ≥ 2.

[0181] Specifically, if the temperature Ti is greater than the average temperature Tave, then reduce the opening degree of the expansion valve 43 corresponding to the temperature Ti. That is to say, when Ti > Tave, reduce the opening degree of the expansion valve 43 corresponding to this temperature Ti, the subcooling degree will increase, and the temperature Ti detected by this temperature sensor 6 will decrease.

[0182] If the temperature Ti is greater than the average temperature Tave, if, then increase the opening degree of its corresponding expansion valve 43. That is to say, if Ti < Tave, increase the opening degree of the expansion valve 43 corresponding to this temperature Ti, the subcooling degree will decrease, and the temperature Ti detected by this temperature sensor 6 will increase.

[0183] In the above embodiment, refer to Figure 18, in step S8, first perform step S81 to determine whether Ti > Tave is satisfied. If so, perform step S82 to reduce the opening degree of the corresponding expansion valve 43 and perform correction compensation on the opening degree of the expansion valve 43. If not, perform step S83 to determine whether Ti < Tave is satisfied. If so, perform step S84 to increase the opening degree of its corresponding expansion valve 43 and perform correction compensation on the opening degree of the expansion valve 43. If not, that is, Ti = Tave, perform step S85 to keep the opening degree of its corresponding expansion valve 43 unchanged.

[0184] In this embodiment, when the temperature Ti is greater than or less than the average temperature, the opening degree of the corresponding expansion valve 43 is corrected to achieve opening degree compensation, thereby making the temperatures detected by multiple sensors uniform, achieving subcooling degree uniformity, improving the heat exchange capacity of the outdoor heat exchanger 42, and improving the air conditioner performance. The outdoor heat exchanger 42 is divided vertically into at least three heat exchange parts 5, and this setting is applicable to outdoor units with relatively high height dimensions.

[0185] When the height dimension of the outdoor heat exchanger 42 becomes larger, the fluctuations in the subcooling degrees of the upper and lower parts of the outdoor heat exchanger 42 become larger. In such a case, the outdoor heat exchanger 42 can be divided into at least three heat exchange parts 5 to more effectively improve the heat exchange capacity.

[0186] Further, the controller is further configured to: if the temperature Ti is equal to the average temperature, keep the opening degree of its corresponding expansion valve 43 unchanged. In this embodiment, when Ti = Tave, there is no need to compensate the opening degree of its expansion valve 43.

[0187] In some other embodiments of the present application, refer to Figure 19 , the controller is further configured to perform step S03 to determine the opening degree of the expansion valve before adjustment according to the target discharge pipe temperature control; after performing step S03, sequentially perform step S7 and step S8.

[0188] In some other embodiments of the present application, in the refrigeration mode, a plurality of distributors 7 are connected to the outlet of the outdoor heat exchanger 42 to divide the outdoor heat exchanger 42 into a plurality of heat exchange parts 5 from top to bottom along its height direction. Among them, the distributor 7, the temperature sensor 6, and the expansion valve 43 are arranged in sequence along the refrigerant flow direction.

[0189] In this embodiment, the outdoor heat exchanger 42 is divided by the distributor 7, and the nature of the distributor 7 determines that each heat exchange part 5 has at least two refrigerant flow paths. In the refrigeration mode, the temperature sensor 6 is arranged at the refrigerant outlet of the distributor 7. By adjusting the opening degree of the expansion valve 43, the subcooling degree of the refrigerant at the position where the temperature sensor 6 is located (the refrigerant outlet of the distributor 7) is made uniform, avoiding the setting of too many temperature sensors 6 and expansion valves 43 and reducing the cost.

[0190] Of course, in some other embodiments, referring to Figure 20 , the outdoor heat exchanger 42 has multiple refrigerant flow paths, and the multiple refrigerant flow paths divide the outdoor heat exchanger 42 into a plurality of heat exchange parts 5 one by one along its height direction from top to bottom; this setting enables the outdoor heat exchanger 42 to be divided according to the refrigerant flow paths, realizing the temperature and subcooling degree uniformity at the refrigerant outlet of each refrigerant flow path in the outdoor heat exchanger 42, and effectively suppressing the fluctuation of the subcooling degree in all refrigerant flow paths of the outdoor heat exchanger 42.

[0191] Referring to Figure 21 , it is a control flow chart for the subcooling degree uniformity at the outlet of the outdoor heat exchanger 42 with multiple heat exchange parts 5 in the refrigeration mode. Specifically:

[0192] When the air conditioner operates, according to the control of the target discharge pipe temperature, the opening degrees of the expansion valves 43 are determined (step S03). After step S03 is executed, step S7 is executed. According to the temperatures detected by each temperature sensor 6, the average temperature at the refrigerant outlet of the heat exchange part 5 is calculated; after step S7 is executed, step S8 is executed, that is, compensation processing is performed. Among them, step S8 specifically includes: if Ti>Tave, the opening degree of the expansion valve is corrected to reduce the opening degree of the corresponding expansion valve 43; if Ti<Tave, the opening degree of the corresponding expansion valve 43 is increased; if Ti=Tave, the opening degree of the corresponding expansion valve 43 is controlled to remain unchanged. After S8 is executed, step S9 is executed to determine the corrected opening degrees of the 1 to n expansion valves 43.

[0193] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0194] For the sake of convenience of explanation, the above description has been made in combination with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. According to the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are for better explaining the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

Claims

1. An air conditioner, characterized in that, Comprising: A refrigerant circuit in which refrigerant circulates successively through a compressor, a condenser, a throttling device, and an evaporator; When the condenser is an outdoor heat exchanger in the refrigeration mode, the outdoor heat exchanger includes: A first heat exchange part having a first refrigerant outlet; A second heat exchange part connected in parallel with the first heat exchange part, the second heat exchange part having a second refrigerant outlet; A first temperature sensor for detecting the refrigerant temperature at the first refrigerant outlet in the refrigeration mode; A second temperature sensor for detecting the refrigerant temperature at the second refrigerant outlet in the refrigeration mode; The throttling device includes: A first expansion valve provided at the first refrigerant outlet; A second expansion valve provided at the second refrigerant outlet; A controller configured to: adjust the opening degrees of the first expansion valve and the second expansion valve according to the temperature difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor.

2. The air conditioner according to claim 1, wherein adjusting the opening degrees of the first expansion valve and the second expansion valve according to the temperature difference includes: If the temperature T1 is greater than the temperature T2, reducing the opening degree of the first expansion valve and increasing the opening degree of the second expansion valve; If the temperature T1 is less than the temperature T2, increasing the opening degree of the first expansion valve and reducing the opening degree of the second expansion valve.

3. An air conditioner, characterized in that, Comprising: A refrigerant circuit in which refrigerant circulates successively through a compressor, a condenser, a throttling device, and an evaporator; When the condenser is an outdoor heat exchanger in the refrigeration mode, the outdoor heat exchanger includes: A first heat exchange part having a first refrigerant outlet; A second heat exchange part connected in parallel with the first heat exchange part, the second heat exchange part having a second refrigerant outlet; A first temperature sensor for detecting the refrigerant temperature at the first refrigerant outlet in the refrigeration mode; A second temperature sensor for detecting the refrigerant temperature at the second refrigerant outlet in the refrigeration mode; The throttling device includes: A first expansion valve provided at the first refrigerant outlet; A second expansion valve, the outlet end of the first expansion valve is connected to the second refrigerant outlet and then connected to the second expansion valve through a pipeline; A controller configured to: Calculate an average temperature according to the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor; Adjust the opening degree of the first expansion valve according to the difference between the temperature T1 and the average temperature.

4. An air conditioner, characterized in that A refrigerant circuit in which refrigerant circulates successively through a compressor, a condenser, a throttling device, and an evaporator; In the refrigeration mode, the condenser is an outdoor heat exchanger, and the outdoor heat exchanger includes: A plurality of heat exchange parts arranged successively from top to bottom along the height direction of the outdoor heat exchanger, the plurality of heat exchange parts are connected in parallel, and the heat exchanger has a refrigerant outlet; A plurality of temperature sensors arranged in one-to-one correspondence with the plurality of heat exchange parts, and the temperature sensors are used to detect the refrigerant temperature at the corresponding refrigerant outlet in the refrigeration mode; The throttling device includes a plurality of expansion valves, and the plurality of expansion valves are respectively arranged at the refrigerant outlets of the plurality of heat exchange parts. In the refrigeration mode, the refrigerant in the outdoor heat exchanger can flow out through the plurality of expansion valves; A controller, configured to: Calculate the average temperature at the refrigerant outlet of the heat exchange part according to the temperatures detected by each of the temperature sensors; Adjust the opening degrees of the respective expansion valves corresponding to the temperature sensors according to the differences between the temperatures detected by each of the temperature sensors and the average temperature.

5. The air conditioner according to claim 4, wherein Adjusting the opening degrees of the respective expansion valves corresponding to the temperature sensors according to the differences includes: If the temperature Ti is greater than the average temperature, reduce the opening degree of the expansion valve corresponding to the temperature Ti; If the temperature Ti is less than the average temperature, increase the opening degree of the expansion valve corresponding to the temperature Ti; The temperature Ti is the temperature detected by the i-th temperature sensor, where i = 1, …… n, and n ≥ 2.

6. The air conditioner according to claim 4, wherein, The controller is further configured to: if the temperature Ti is equal to the average temperature, control the opening degree of the expansion valve corresponding to the temperature Ti to remain unchanged.

7. The air conditioner according to claim 5 or 6, characterized in that, The controller is further configured to: determine the opening degree of the expansion valve before adjustment according to the control of the target discharge pipe temperature.

8. The air conditioner according to claim 4, wherein In the refrigeration mode, a plurality of distributors are connected to the outlet end of the outdoor heat exchange part to divide the outdoor heat exchanger into a plurality of the heat exchange parts from top to bottom along its height direction. The distributor, the temperature sensor, and the expansion valve are arranged in sequence along the refrigerant flow direction.

9. The air conditioner according to claim 8, wherein The number of heat transfer tubes corresponding to the plurality of heat exchange parts is the same, and the height ratios of the plurality of heat exchange parts in the outdoor heat exchanger are the same.

10. The air conditioner according to any one of claims 4 to 7, characterized in that, The outdoor heat exchanger has a plurality of refrigerant flow paths, and the plurality of refrigerant flow paths divide the outdoor heat exchanger into a plurality of the heat exchange parts from top to bottom along its height direction in one-to-one correspondence.

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