Air conditioner

Abstract

An air conditioner (1000), comprising a housing (50), a four-way valve (20) and a heat exchanger assembly (30). The heat exchanger assembly (30) comprises a heat exchanger body (33), flow dividing assemblies (34, 37) and an air collecting tube (35). The heat exchanger body (33) comprises a plurality of first flat tubes (331) and a plurality of second flat tubes (332). Two first flat tubes (331) from the plurality of first flat tubes (331) are arranged close to two ends of the air collecting tube (35) in a first direction, and a second direction is perpendicular to the first direction. Between the two first flat tubes (331) close to the two ends of the air collecting tube (35), every two second flat tubes (332) and every two first flat tubes (331) are alternately arranged at intervals in the first direction, so that the ends of every two first flat tubes (331) close to the air collecting tube (35) are adjacently arranged, and the ends of every two second flat tubes (332) close to the flow dividing assemblies (34, 37) are adjacently arranged.

Description

[0001] This application claims priority to Chinese patent application No. 202211587316.6, filed on December 09, 2022, Chinese patent application No. 202310113886.X, filed on February 14, 2023, and Chinese patent application No. 202320213836.4, filed on February 14, 2023, the contents of which are hereby incorporated by reference in their entireties.TECHNICAL FIELD

[0002] The present application relates to the field of air conditioning technology, and in particular, to an air conditioner.BACKGROUND

[0003] An air conditioner is one of the commonly used electrical appliances in household life. The air conditioner, also known as an air conditioning device, is a device that can regulate parameters such as the temperature, humidity, and flow rate of air in a building (or structure). Typically, the air conditioner achieves heat exchange by using a heat exchanger, so that heat is transferred from a lower-temperature fluid to a higher-temperature fluid, thereby enabling the air conditioner to provide cooling and heating. The heat exchanger, also known as a thermal exchanger, is one of the core components of the air conditioner.SUMMARY

[0004] An air conditioner is provided. The air conditioner includes a housing, a four-way valve, and a heat exchanger assembly. The heat exchanger assembly is provided in the housing. The heat exchanger assembly includes a heat exchanger body, a flow splitting assembly, and a gas collecting tube. The heat exchanger body is configured to exchange heat with refrigerant. The flow splitting assembly is configured to split the refrigerant to improve uniformity of the refrigerant flowing into the heat exchanger body. The gas collecting tube extends along a first direction and in communication with the four-way valve. The flow splitting assembly and the gas collecting tube are located on a same side of the heat exchanger body, and along a flow direction of the refrigerant the flow splitting assembly and the gas collecting tube are respectively connected to opposite sides of the heat exchanger body. The heat exchanger body includes a plurality of first flat tubes and a plurality of second flat tubes. The plurality of first flat tubes are in communication with the gas collecting tube and arranged along the first direction, and the plurality of first flat tubes separately extend along a second direction. Two of the plurality of first flat tubes are provided adjacent to two ends of the gas collecting tube along the first direction, and the second direction is perpendicular to the first direction. The plurality of second flat tubes are in communication with the flow splitting assembly and arranged along the first direction, and the plurality of second flat tubes separately extend along the second direction. Between the two first flat tubes adjacent to the two ends of the gas collecting tube, every two second flat tubes and every two first flat tubes are arranged alternately and spaced apart along the first direction, so that ends of every two first flat tubes adjacent to the gas collecting tube are adjacent to each other, and ends of every two second flat tubes adjacent to the flow splitting assembly are adjacent to each other. The end of the first flat tube adjacent to the gas collecting tube is in communication with the gas collecting tube, and another end of the first flat tube away from the gas collecting tube is connected to and in communication with another end of the second flat tube adjacent to the first flat tube away from the flow splitting assembly. The end of the second flat tube adjacent to the flow splitting assembly is connected to and in communication with the flow splitting assembly.BRIEF DESCRIPTION OF THE DRAWINGS

[0005] In order to illustrate the technical solutions of the present application more clearly, the drawings used in some embodiments will be described briefly. Apparently, the following described drawings are merely for some embodiments of the present application, and other drawings can be derived based on these drawings by those of ordinary skill in the art without any creative effort. In addition, the drawings in the following description can be regarded as schematic diagrams and are not intended to limit the actual dimensions of the products, the actual processes of the methods, the actual timing of signals, etc., involved in the embodiments of the present disclosure. FIG. 1 is a structural diagram of an air conditioner according to some embodiments. FIG. 2 is a top view of an air conditioner according to some embodiments. FIG. 3 is a structural diagram of a heat exchanger assembly according to some embodiments. FIG. 4 is a structural diagram of a second flow splitting assembly shown in FIG. 3. FIG. 5 is another structural diagram of the heat exchanger assembly in FIG. 3. FIG. 6 is a partial enlarged view of a circled portion E in FIG. 3. FIG. 7 is a schematic diagram illustrating an arrangement of first flat tubes and second flat tubes in a heat exchanger body according to some embodiments. FIG. 8 is a partial enlarged view of a circled portion F in FIG. 5. FIG. 9 is a partial enlarged view of a circled portion G in FIG. 5. FIG. 10 is a structural diagram illustrating a first flow splitting assembly in FIG. 8 connected to a branch tube and a plurality of second flat tubes. FIG. 11 is an exploded view of the first flow splitting assembly in FIG. 10. FIG. 12 is a side view of the second connecting plate in FIG. 11. FIG. 13 shows a flow velocity vector diagram of refrigerant in a third flow guiding channel in FIG. 12. FIG. 14 shows a flow velocity vector diagram of refrigerant in a first flow guiding channel and a second flow guiding channel in FIG. 12. FIG. 15 is another exploded view of the first flow splitting assembly in FIG. 10. FIG. 16 is a side view of a fourth connecting plate in FIG. 15. FIG. 17 is a schematic diagram of a flow channel structure of the first flow splitting assembly in FIG. 10. FIG. 18 is yet another exploded view of the first flow splitting assembly in FIG. 10. FIG. 19 is still another exploded view of the first flow splitting assembly in FIG. 10. FIG. 20 is a schematic diagram of a flow channel structure of the first flow splitting assembly in FIG. 19. DETAILED DESCRIPTION

[0006] The embodiments of the present application will be described more clearly and comprehensively below in conjunction with the accompanying drawings. Apparently, the embodiments described herein are only part of, not all of the embodiments of the present application. Base on the embodiments provided in the present application, other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0007] Unless specified otherwise in the context, the term "include" and variations thereof such as the third-person singular form "comprises" and the present participle form "comprising" are interpreted as open ended and inclusive, meaning "include, but is not limited to" through the specification and claims. In the description of the specification, the terms such as "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example", "some examples", or the like indicate that specific features, structures, materials, or characteristics related to the embodiment or example are included in at least one embodiment or example in the present application. The expression means that these terms do not necessarily refer to the same embodiment or example, and the specified features, structures, materials, or characteristics can be incorporated in one or multiple embodiments or examples in any appropriate manners.

[0008] In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be construed as indicating or implying a relative importance, or implicitly specifying the number of the indicated technical features. Thus, the quantity of the feature defined with "first" or "second" may explicitly or implicitly include one or more. In the description of the embodiments of the present application, "a plurality of' means two or more, unless otherwise defined explicitly and specifically.

[0009] When describing some embodiments, the expression "connected" and its derivatives may be used. The term "connected" should be interpreted broadly, for example, it may refer to a fixed connection, a detachable connection, or an integral connection. It may be a direct connection or an indirect connection through an intermediary medium. The embodiments disclosed herein are not necessarily limited to the content in context.

[0010] "At least one of A, B, or C" includes the following combinations of A, B, and C: A alone, B alone, C alone, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B, and C.

[0011] The terms "suitable for" and "configured to" in context are open and inclusive expressions. The do not exclude devices suitable for or configured to perform additional tasks or steps.

[0012] As used herein, "about", "approximately", or "substantially" includes the stated value and the average value within an acceptable deviation range of the specific value, where the acceptable deviation range is determined by those of ordinary skill in the art, taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system).

[0013] As used herein, "parallel", "perpendicular" or "equal" includes the stated condition and conditions similar to the stated condition, where the range of the similar conditions falls within an acceptable deviation range. The acceptable deviation range is determined by those of ordinary skill in the art, taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system).

[0014] Generally, when the heat exchanger in the air conditioner functions as an evaporator, the refrigerant flowing into the evaporator has a certain dryness after throttling, with part of the refrigerant in the gaseous state and another part in the liquid state. Consequently, when the refrigerant flows at a low velocity, the gaseous refrigerant and liquid refrigerant can be separated. When this separation occurs prior to the refrigerant enters the evaporator, most of the liquid refrigerant flows into the coils located in the lower region of the evaporator, while most of the gaseous refrigerant flows into the coils located in the upper region of the evaporator. This results in uneven distribution of refrigerant within the evaporator, thereby reducing the heat exchange efficiency of the evaporator. Here, the term "dryness" refers to a mass fraction of the gaseous refrigerant in the total refrigerant.

[0015] In order to address the above issues, some embodiments of the present application provide an air conditioner 1000.

[0016] FIG. 1 is a structural diagram of an air conditioner according to some embodiments. As shown in FIG. 1, the air conditioner 1000 includes an indoor unit 100 and an outdoor unit 200. The indoor unit 100 and outdoor unit 200 are connected through pipelines to transfer a refrigerant. The indoor unit 100 includes an indoor heat exchanger 32. The outdoor unit 200 includes a compressor 10, a four-way valve 20, an outdoor heat exchanger 31, and a throttling device 40. The compressor 10, the outdoor heat exchanger 31, the throttling device 40, and the indoor heat exchanger 32 are connected in sequence to form a refrigerant circuit. The refrigerant circulates in the refrigerant circuit and exchanges heat with surrounding air through the outdoor heat exchanger 31 and the indoor heat exchanger 32 respectively, so as to achieve the cooling or heating mode of the air conditioner 1000. Here, the indoor heat exchanger 32 and outdoor heat exchanger 31 can be collectively referred to as a heat exchanger assembly 30.

[0017] The indoor heat exchanger 32 is configured to exchange heat between the indoor air and the refrigerant flowing through the indoor heat exchanger 32. For example, in the cooling mode of the air conditioner 1000, the indoor heat exchanger 32 functions as an evaporator, allowing the refrigerant which has dissipated heat through the outdoor heat exchanger 31 to absorb heat from the indoor air through the indoor heat exchanger 32 and evaporate. In the heating mode of the air conditioner 1000, the indoor heat exchanger 32 functions as a condenser, allowing the refrigerant which has absorbed heat through the outdoor heat exchanger 31 to dissipate heat to the indoor air through the indoor heat exchanger 32 and condense.

[0018] The compressor 10 is configured to compress the refrigerant, so that a low-pressure refrigerant can be compressed to form a high-pressure refrigerant.

[0019] The outdoor heat exchanger 31 is configured to exchange heat between the outdoor air and the refrigerant flowing through the outdoor heat exchanger 31. For example, in the cooling mode of the air conditioner 1000, the outdoor heat exchanger 31 functions as the condenser, allowing the refrigerant compressed by the compressor 10 to dissipate heat to the outdoor air through the outdoor heat exchanger 31 and condense. In the heating mode of the air conditioner 1000, the outdoor heat exchanger 31 functions as the evaporator, allowing the depressurized refrigerant to absorb heat from the outdoor air through the outdoor heat exchanger 31 and evaporate.

[0020] The throttling device 40 is connected between the outdoor heat exchanger 31 and the indoor heat exchanger 32. The pressure of the refrigerant flowing through the outdoor heat exchanger 31 and the indoor heat exchanger 32 can be adjusted by the opening degree of the throttling device 40, thereby controlling the flow rate of the refrigerant flowing between the outdoor heat exchanger 31 and the indoor heat exchanger 32. The flow rate and pressure of the refrigerant flowing between the outdoor heat exchanger 31 and the indoor heat exchanger 32 can affect the heat exchange performance of the outdoor heat exchanger 31 and the indoor heat exchanger 32. The opening degree of the throttling device 40 can be adjusted, so as to control the flow rate and pressure of the refrigerant flowing through the throttling device 40. For instance, the throttling device 40 enables the liquid refrigerant condensed in the condenser to expand into the low-pressure liquid refrigerant.

[0021] The throttling device 40 can be a pressure reducing tube, such as a capillary tube, or can be an electronic expansion valve. It should be noted that some embodiments of the present application are described by taking the throttling device 40 being disposed in the outdoor unit 200 as an example. Optionally, in some embodiments, the throttling device 40 can be disposed either in the indoor unit 100 or in the refrigerant pipeline between the outdoor unit 200 and the indoor unit 100, as long as the throttling device 40 can be located between the indoor heat exchanger 32 and the outdoor heat exchanger 31 along the flow direction of the refrigerant.

[0022] The four-way valve 20 is connected in the refrigerant circuit and is configured to switch the flow direction of the refrigerant in the refrigerant circuit, enabling the air conditioner 1000 to operate in either cooling or heating mode.

[0023] For example, the four-way valve 20 includes a first port A, a second port B, a third port C, and a fourth port D. An end of the compressor 10 is connected to the first port A of the four-way valve 20, while the other end of the compressor 10 is connected to the second port B of the four-way valve. The third port C of the four-way valve is connected to an end of the outdoor heat exchanger 31. The other end of the outdoor heat exchanger 31 is connected an end of the indoor heat exchanger 32 through the throttling device 40. The other end of the indoor heat exchanger 32 is connected to the fourth port D of the four-way valve.

[0024] The cooling and heating modes of air conditioner 1000 will be described in detail below with reference to FIG. 1 as an example.

[0025] When the air conditioner 1000 operates in the cooling mode, the second port B and the third port C of the four-way valve 20 are in communication with each other, and the fourth port D and the first port A are in communication with each other. In this case, the refrigerant can circulate sequentially through the compressor 10, the second port B and the third port C of the four-way valve 20, the outdoor heat exchanger 31, the throttling device 40, the indoor heat exchanger 32, the fourth port D and the first port A of the four-way valve 20, and back to the compressor 10. In this process, the outdoor heat exchanger 31 serves as the condenser and the indoor heat exchanger 32 serves as the evaporator. The refrigerant can release heat at the outdoor heat exchanger 31 to exchange heat with the outdoor air, and the refrigerant can also absorb heat at the indoor heat exchanger 32 to exchange heat with the indoor air, thereby cooling the indoor air and realizing the cooling effect of the air conditioner 1000.

[0026] When the air conditioner 1000 operates in the heating mode, the second port B and the fourth port D of the four-way valve 20 are in communication with each other, and the third port C and the first port A are in communication with each other. In this case, the refrigerant can circulate sequentially through the compressor 10, the second port B and the fourth port D of the four-way valve 20, the indoor heat exchanger 32, the throttling device 40, the outdoor heat exchanger 31, the third port C and the first port A of the four-way valve 20, and back to the compressor 10. In this process, the indoor heat exchanger 32 serves as the condenser and the outdoor heat exchanger 31 serves as the evaporator. The refrigerant can absorb heat at the outdoor heat exchanger 31 to exchange heat with the outdoor air, and the refrigerant can also release heat at the indoor heat exchanger 32 to exchange heat with the indoor air, thereby heating the indoor air and realizing the heating effect of the air conditioner 1000.

[0027] Thus, the refrigerant can circulate between the indoor unit 100 and the outdoor unit 200 while undergoing a reversible phase change, and during the phase change of the refrigerant, the refrigerant can release or absorb heat. In this way, the refrigerant in the outdoor unit 200 can exchange heat through the outdoor heat exchanger 31 to either release heat to heat the outdoor air or absorb heat to cool the outdoor air, while the refrigerant in the indoor unit 100 can exchange heat through the indoor heat exchanger 32 to either absorb heat to cool the indoor air or release heat to heat the indoor air.

[0028] FIG. 2 is a top view of an air conditioner according to some embodiments. In some embodiments, as shown in FIG. 2, the air conditioner 1000 further includes a housing 50 and a fan assembly 60. The heat exchanger assembly 30 and the fan assembly 60 can be mounted in the housing 50, and the heat exchanger assembly 30 can be disposed adjacent to an air outlet or an air inlet of the housing 50. The fan assembly 60 can be configured to drive air through the heat exchanger assembly 30. As such, as the fan assembly 60 rotates, the air flow driven by the fan assembly 60 can pass through the heat exchanger assembly 30 to exchange heat with the refrigerant flowing in the heat exchanger assembly 30 through the heat exchanger assembly 30.

[0029] It should be noted that, when the air conditioner 1000 is a split-type air conditioner, the housing 50 can be a housing of either the indoor unit 100 or the outdoor unit 200. The fan assembly 60 can be an indoor fan corresponding to the indoor unit 100 or an outdoor fan corresponding to the outdoor unit 200. The corresponding heat exchanger assembly 30 can be the indoor heat exchanger 32 or the outdoor heat exchanger 31.

[0030] Taking the housing 50 as an outer shell of the outdoor unit 200 as an example, the heat exchanger assembly 30 in FIG. 2 can be the outdoor heat exchanger 31, and the fan assembly 60 in FIG. 2 can be the outdoor fan corresponding to the outdoor unit 200. The outdoor fan can be a centrifugal fan or a cross-flow fan to drive the outdoor air around the outdoor unit 200 to continuously flow through the outdoor heat exchanger 31, so that the refrigerant circulating in the outdoor heat exchanger 31 can heat or cool the outdoor air flowing through the outdoor heat exchanger 31. In this case, other components of the outdoor unit 200, such as the compressor 10 and the four-way valve 20, can be mounted in the housing 50.

[0031] Taking the housing 50 as an outer shell of the indoor unit 100 as an example, the heat exchanger assembly 30 in FIG. 2 can be the indoor heat exchanger 32, and the fan assembly 60 in FIG. 2 can be the indoor fan corresponding to the indoor unit 100. The indoor fan can be an axial-flow fan or a centrifugal fan to drive the indoor air around the indoor unit 100 to continuously flow through the indoor heat exchanger 32, so that the refrigerant circulating in the indoor heat exchanger 32 can heat or cool the indoor air flowing through the indoor heat exchanger 32.

[0032] The heat exchanger assembly 30 in some embodiments of the present application will be described in detail below.

[0033] FIG. 3 shows a structural diagram of a heat exchanger assembly according to some embodiments. FIG. 4 shows a structural diagram of the second flow splitting assembly shown in FIG. 3. In some embodiments, taking the heat exchanger assembly 30 as the outdoor heat exchanger 31 as an example, as shown in FIG. 3, the heat exchanger assembly 30 includes a heat exchanger body 33, a second flow splitting assembly 34, and a gas collecting tube 35.

[0034] The heat exchanger body 33 is a main structure of the heat exchanger assembly 30, and is configured to perform heat exchange of the refrigerant. A plurality of refrigerant channels are provided in the heat exchanger body 33, and the refrigerant flows in the plurality of refrigerant channels to perform heat exchange. In the flow direction of the refrigerant, the second flow splitting assembly 34 and the gas collecting tube 35 can be located on opposite sides of the heat exchanger body 33. The second flow splitting assembly 34 and the gas collecting tube 35 are connected to and in communication with the heat exchanger body 33. For example, when the heat exchanger assembly 30 is the outdoor heat exchanger 31, the second flow splitting assembly 34 is provided on the refrigerant circuit between the throttling device 40 and the heat exchanger body 33, while the gas collecting tube 35 is provided on the refrigerant circuit between the heat exchanger body 33 and the four-way valve 20.

[0035] The gas collecting tube 35 extends in the first direction and is provided between the heat exchanger body 33 and the four-way valve 20 to communicate with the four-way valve 20. Here, the first direction is substantially parallel to the up-down direction in FIG. 3.

[0036] As shown in FIG. 4, the second flow splitting assembly 34 includes a main liquid tube 341, a flow splitting portion 342, and a plurality of branch tubes 343. An end of the main liquid tube 341 is connected to an end (e.g., a lower end) of the flow splitting portion 342 away from the branch tube 343, and the other end of the main liquid tube 341 is connected to the throttling device 40 or the indoor heat exchanger 32. An end (e.g., an upper end) of the flow splitting portion 342 adjacent to the branch tube 343 is provided with a plurality of connecting ports, and the plurality of connecting ports correspond to the plurality of branch tubes 343. For example, one connecting port is connected to one branch tube 343. The ends of the plurality of branch tubes 343 away from the flow splitting portion 342 correspond to and are in communication with the plurality of refrigerant channels in the heat exchanger body 33, respectively.

[0037] In this way, after the gas-liquid two-phase refrigerant or the liquid-phase refrigerant flows into the flow splitting portion 342 through the throttling device 40 and the main liquid tube 341, the refrigerant can be uniformly split by the flow splitting portion 342. The split refrigerant can flow into the plurality of branch tubes 343 through the plurality of connecting ports of the flow splitting portion 342, and then flow into the plurality of refrigerant channels of the heat exchanger body 33 through the plurality of branch tubes 343, thereby improving the uniformity of the refrigerant in the plurality of refrigerant channels of the heat exchanger body 33.

[0038] In some embodiments, the flow splitting portion 342 can be a flow splitting structure similar to a shower head.

[0039] FIG. 5 shows another structural diagram of the heat exchanger assembly in FIG. 3. FIG. 5 shows a three-dimensional structure of the heat exchanger assembly 30. In some embodiments, as shown in FIG. 5, the heat exchanger assembly 30 further includes a gas tube assembly 36, and the gas tube assembly 36 includes a gas main tube 361 and a plurality of gas sub-tubes 362. The gas main tube 361 can extend along the first direction and be provided adjacent to the gas collecting tube 35. The plurality of gas sub-tubes 362 can be spaced apart along the first direction. An end of the gas sub-tube 362 can be connected to and in communication with the gas main tube 361, and the other end of the gas sub-tube 362 can be connected to and in communication with the gas collecting tube 35, thereby allowing the gas main tube 361 and the gas collecting tube 35 to be in communication with each other through the plurality of gas sub-tubes 362. In this way, the gas main tube 361 can replace the gas collecting tube 35 to be connected to the four-way valve 20, enabling the four-way valve 20 to be in communication with the gas collecting tube 35.

[0040] For example, when the heat exchanger assembly 30 is the outdoor heat exchanger 31, the main gas tube 361 is connected to and in communication with the third port C of the four-way valve 20. When the heat exchanger assembly 30 serves as the indoor heat exchanger 32, the main gas tube 361 is connected to and in communication with the fourth port D of the four-way valve 20. Optionally, some embodiments of the present application are not limited thereto. In the case that the heat exchanger assembly 30 is not provided with the gas tube assembly 36, the gas collecting tube 35 can be directly connected to and in communication with the four-way valve 20, as long as the gas collecting tube 35 can be in communication with the four-way valve 20.

[0041] In some embodiments, the heat exchanger assembly 30 can be a finned heat exchanger or a microchannel heat exchanger, used for the flow of the refrigerant in the outdoor heat exchanger 31 or the indoor heat exchanger 32, which is not limited in the present application. It should be noted that the microchannel heat exchanger can be a heat exchanger composed of a plurality of flat tubes, and the flat tube is provide with a plurality of microchannels for the flow of the refrigerant, such as the refrigerant channels in the heat exchanger body 33. The finned heat exchanger can be a heat exchanger formed by connecting a plurality of fins to a plurality of metal tubes such as copper tubes, and the metal tubes are also be provided with channels for the flow of the refrigerant, such as the refrigerant channels in the heat exchanger body33.

[0042] FIG. 6 is a partial enlarged view of a circled portion E in FIG. 3. In some embodiments, taking the heat exchanger assembly 30 as the outdoor heat exchanger 31 as an example. As shown in FIG. 6, the heat exchanger body 33 includes a plurality of first flat tubes 331 and a plurality of second flat tubes 332, and the number of the first flat tubes 331 is the same as the number of the second flat tubes 332. The plurality of first flat tubes 331 are in communication with the gas collecting tube 35, respectively, and the plurality of second flat tubes 332 are in communication with the second flow splitting assembly 34, respectively. Moreover, the plurality of first flat tubes 331 and the plurality of second flat tubes 332 are arranged along the first direction, respectively. In this case, one of the plurality of first flat tubes 331 can be arranged adjacent to one end (e.g., the top end) of the gas collecting tube 35 along the first direction, and another of the plurality of first flat tubes 331 can be arranged adjacent to the other end (e.g., the bottom end) of the gas collecting tube 35 along the first direction. Thus, two of the plurality of first flat tubes 331 can be respectively arranged adjacent to the two ends of the gas collecting tube 35 along the first direction, and the two first flat tubes 331 are located at the outermost sides of the plurality of first flat tubes 331 in the arrangement direction thereof, respectively.

[0043] The plurality of first flat tubes 331 can extend along a second direction (e.g., the left-right direction in FIG. 3), respectively, so that the plurality of first flat tubes 331 are parallel to each other. The plurality of second flat tubes 332 can also extend along the second direction, respectively, so that the plurality of second flat tubes 332 are parallel to each other. Since the extension directions of the plurality of first flat tubes 331 and the plurality of second flat tubes 332 are substantially the same, the plurality of first flat tubes 331 and the plurality of second flat tubes 332 can be approximately parallel. Here, the second direction is perpendicular to the first direction.

[0044] It should be noted that some embodiments of the present application are described by taking the second direction being perpendicular to the first direction as an example. Optionally, in some embodiments, the angle between the first direction and the second direction can also be an acute angle or an obtuse angle, as long as the first direction can intersect with the second direction. Additionally, the second direction can be a straight-line direction. For example, the first flat tube 331 and the second flat tube 332 can extend along the straight-line direction. The present application is not limited thereto. The second direction can also be a curved line direction. For example, the first flat tube 331 and the second flat tube 332 can extend along the curved line direction. Alternatively, part of the second direction can be a straight-line direction, and another part of the second direction can be a curved line direction. For example, the first flat tube 331 and the second flat tube 332 can first extend along the straight-line direction (e.g., from right to left), and then bend toward one side (e.g., backward) and extend along another straight-line direction (e.g., from front to back), which is not limited in the present application.

[0045] As shown in FIGs. 3 and 6, among the plurality of first flat tubes 331, between the uppermost first flat tubes 331 and the lowermost first flat tube 331 i.e., among the plurality of first flat tubes 331, between the two first flat tubes 331 closest to the two ends of the gas collecting tube 35, every two second flat tubes 332 and every two first flat tubes 331 are provided alternately and spaced apart along the first direction, so that each second flat tube 332 can be provided adjacent to one first flat tube 331. In this case, the plurality of first flat tubes 331 and the plurality of second flat tubes 332 can be provided on the same side (e.g., the left side) of the gas collecting tube 35, so that an end (e.g., the right end) of the first flat tube 331 adjacent to the gas collecting tube 35 can be connected to and in communication with the gas collecting tube 35.

[0046] In some embodiments, as shown in FIG. 6, the heat exchanger assembly 30 further includes a first flow splitting assembly 37. The first flow splitting assembly 37 can be of a laminated structure. The first flow splitting assembly 37 can be provided between the heat exchanger body 33 and the second flow splitting assembly 34. A plurality of branch tubes 343 can be in communication with the ends (e.g., the right ends) of the plurality of second flat tubes 332 adjacent to the second flow splitting assembly 34 through one or more first flow splitting assemblies 37. The other ends (e.g., the left ends) of the plurality of second flat tubes 332 away from the second flow splitting assembly 34 can be connected to and in communication with the ends (e.g., the left end) of the adjacent first flat tubes 331 away from the gas collecting tube 35.

[0047] FIG. 7 is a schematic diagram illustrating an arrangement of the first flat tubes and the second flat tubes in the heat exchanger body according to some embodiments. For example, as shown in FIG. 7, the left ends of one first flat tube 331 and one second flat tube 332 arranged adjacent to each other can be connected and communicated. From top to bottom, the left end of the first one of the first flat tubes 331 can be connected to and in communication with the left end of the first one of the second flat tubes 332. The left end of the second one of the first flat tubes 331 can be connected to and in communication with the left end of the second one of the second flat tubes 332. By analogy, the left end of the last one of the first flat tubes 331 can be connected to and in communication with the left end of the last one of the second flat tubes 332.

[0048] In this way, when the heat exchanger assembly 30 is the evaporator in the outdoor unit 200, the gas-liquid two-phase refrigerant can be mixed and split through the second flow splitting assembly 34 and the first flow splitting assembly 37, allowing the two-phase refrigerant to flow evenly into the plurality of second flat tubes 332, thereby improving the overall heat exchange efficiency of the heat exchanger assembly 30.

[0049] It should be noted that some embodiments of the present disclosure are described by taking the case where one end (e.g., the right end) of the second flat tube 332 is in communication with the branch tube 343 through the first flow splitting assembly 37 as an example. Optionally, in some embodiments, only the second flow splitting assembly 34 and the first flow splitting assembly 37 can be provided between the heat exchanger assembly 30 and the throttling device 40, as long as the gas-liquid two-phase refrigerant can evenly flow into the plurality of second flat tubes 332 of the heat exchanger body 33, which is not limited in the present application. For example, the right end of the second flat tube 332 can only be connected to and in communication with either the first flow splitting assembly 37 or the second flow splitting assembly 34.

[0050] Taking the case where the right end of the second flat tube 332 is connected to the first flow splitting assembly 37 as an example, along the flow direction of the refrigerant, the first flow splitting assembly 37 and the gas collecting tube 35 can be connected to opposite sides of the heat exchanger body 33. For example, when the heat exchanger assembly 30 servers as the outdoor heat exchanger 31, the first flow splitting assembly 37 is provided on the refrigerant circuit between the throttling device 40 and the heat exchanger body 33, while the gas collecting tube 35 is provided on the refrigerant circuit between the heat exchanger body 33 and the four-way valve 20.

[0051] When a small number of the second flat tubes 332 are provided, the heat exchanger assembly 30 can include one first flow splitting assembly 37. The first flow splitting assembly 37 has a plurality of flow splitting ports correspondingly connected to the plurality of second flat tubes 332. In this way, the gas-liquid two-phase refrigerant split by the first flow splitting assembly 37 can flow into the corresponding second flat tube 332 through the flow splitting ports, then flow into the gas collecting tube 35 through the corresponding first flat tube 331, and finally flow into the four-way valve 20. When a large number of the second flat tubes 332 are provided, the heat exchanger assembly 30 can include a plurality of first flow splitting assemblies 37. Each first flow splitting assembly 37 has a plurality of flow splitting ports, and one of the first flow splitting assemblies 37 can correspond to two or more second flat tubes 332. For example, the plurality of flow splitting ports of one first flow splitting assembly 37 can be respectively connected to two or more second flat tubes 332 to evenly split the refrigerant. Therefore, the number of first flow splitting assemblies 37 is not limited in the present disclosure.

[0052] It should be noted that one second flat tube 332 can also be directly connected to one branch tube 343. Alternatively, one branch tube 343 can be connected to a plurality of second flat tubes 332 through the first flow splitting assembly 37, so that the refrigerant to be flowed into the second flat tubes 332 is split through the first flow splitting assembly 37.

[0053] Typically, when the heat exchanger is the microchannel heat exchanger which serves as the condenser of the outdoor unit, the refrigerant at the outlet side of the condenser has a relatively high subcooling degree, while the refrigerant at the inlet side of the condenser has a relatively high superheating degree. When the liquid inlet ends (e.g., liquid ends) and gas outlet ends (e.g., gas ends) of the flat tubes in the microchannel heat exchanger are alternately arranged along the vertical direction, a large temperature difference exists between the liquid inlet ends and gas outlet ends of the flat tubes. The heat from the refrigerant at the liquid inlet ends of the flat tubes can be transferred to the refrigerant at the gas outlet ends of the flat tubes, which reduces the superheating degree of the refrigerant at the liquid inlet ends, thereby lowering the heat exchange efficiency of the condenser. Moreover, when heat from the refrigerant at the liquid inlet ends of the flat tubes is transferred to the refrigerant at the gas outlet ends of the flat tubes, the subcooling degree of the refrigerant at the gas outlet ends is also reduced, which reduces the cooling effect of the indoor unit serving as the evaporator, thereby further adversely affecting the heat exchange efficiency of the condenser.

[0054] For example, when one of the first flat tubes 331 and one of the second flat tubes 332 are alternatively spaced apart along the first direction, a large temperature difference exists between an end (e.g., the right end) of the first flat tube 331 away from the second flat tube 332 and an end (e.g., the right end) of the second flat tube 332 away from the first flat tube 331 along the flow direction of the refrigerant, which leads to heat transfer between adjacent first flat tube 331 and second flat tube 332, thereby reducing the heat exchange efficiency of the heat exchanger.

[0055] However, in some embodiments of the present application, taking one set of flat tubes as shown in FIG. 7 as an example, where one set of flat tubes consisting of one first flat tube 331 and one second flat tube 332 that are connected and in communication with each other, a large temperature difference exists between the refrigerant at the liquid end (e.g., the right end of the second flat tube 332) and the refrigerant at the gas end (e.g., the right end of the first flat tube 331) in the same set of flat tubes. In this case, the two first flat tubes 331 in two adjacent sets of flat tubes are adjacent to each other, and the two second flat tubes 332 in two adjacent sets of flat tubes are also adjacent to each other. Therefore, the temperature difference between the two liquid ends and the temperature difference between two gas ends in two adjacent sets of flat tubes are small. Thus, the temperature difference between two adjacent second flat tubes 332 and the temperature difference between two adjacent first flat tubes 331 are small. No heat is transferred between the second flat tube 332 in one set of flat tubes and the first flat tube 331 in another adjacent set of flat tubes, or heat is transferred between the second flat tube 332 in one set of flat tubes and the first flat tube 331 in another adjacent set of flat tubeis relatively small, thereby effectively reducing heat loss caused by temperature differences between two adjacent sets of flat tubes and improving the heat exchange efficiency of the heat exchanger body 33.

[0056] The preceding description mainly takes the case where the heat exchanger body 33 adopts a single-row of flat tubes (e.g., the plurality of first flat tubes 331 and the plurality of second flat tubes 332 are located in the same plane), such as the heat exchanger assembly 30 being a single-row microchannel heat exchanger, as an example. Optionally, in some embodiments, the heat exchanger body 33 can also adopt a multi-row of flat tubes (e.g., rows of flat tubes each are located in multiple roughly parallel planes), such as the heat exchanger assembly 30 being a multi-row microchannel heat exchanger, so as to improve the heat exchange efficiency of the heat exchanger body 33. For example, the heat exchanger assembly 30 can be a dual-row microchannel heat exchanger, where the heat exchanger body 33 in the heat exchanger assembly 30 adopts dual-row flat tubes.

[0057] FIG. 8 is a partial enlarged view of a circled portion F in FIG. 5. In some embodiments, as shown in FIG. 8, the heat exchanger body 33 further includes a plurality of third flat tubes 333, a plurality of fourth flat tubes 334, and a plurality of connecting tubes 335. The numbers of the third flat tubes 333, the fourth flat tubes 334, and the connecting tubes 335 are the same as the number of the first flat tubes 331. The plurality of third flat tubes 333 are provided corresponding to the plurality of first flat tubes 331. Thus, one of the plurality of third flat tubes 333 is provided adjacent to the top end of the gas collecting tube 35 along the first direction, and another one f the plurality of third flat tubes 333 is provided adjacent to the bottom end of the gas collecting tube 35 along the first direction. As a result, the two third flat tubes 333 are at the same height as the two first flat tubes 331 of the plurality of first flat tube 331 closest to the two ends of the gas collecting tube 35 along the first direction. Correspondingly, between the two third flat tubes 333, i.e., the two third flat tubes 333 of the plurality of first flat tube 331 closest to the two ends of the gas collecting tube 35, every two fourth flat tubes 334 and every two third flat tubes 333 are arranged alternately and spaced apart along the first direction. In this way, each third flat tube 333 can be provided adjacent to one fourth flat tube 334. The plurality of third flat tubes 333 can extend along the second direction, respectively, and the plurality of fourth flat tubes 334 can also extend along the second direction, respectively, so that the plurality of fourth flat tubes 334 can be arranged approximately parallel to the plurality of third flat tubes 333. Moreover, the plurality of third flat tubes 333 and the plurality of fourth flat tubes 334 are provided on the same side (e.g., the left side) of the gas collecting tube 35 adjacent to the first flat tubes 331, so that the ends (e.g., the right ends) of the plurality of fourth flat tubes 334 adjacent to the gas collecting tube 35 can be connected to and in communication with the gas collecting tube 35.

[0058] FIG. 9 is a partial enlarged view of a circled portion G in FIG. 5. FIG. 9 shows a flow direction of the refrigerant in the third flat tube 333 and the fourth flat tube 334. However, the present application is not limited thereto. As shown in FIG. 9, an end (e.g., the left end) of the fourth flat tube 334 away from the gas collecting tube 35 is connected to and in communication with an end (e.g., the left end) of an adjacent third flat tube 333 away from the gas collecting tube 35. As shown in FIG. 8, an end (e.g., the right end) of the first flat tube 331 adjacent to the gas collecting tube 35 is connected to and in communication with the right end of the corresponding third flat tube 333 (e.g., the third flat tube 333 at the same height as the first flat tube 331) through the connecting tube 335. In this way, the refrigerant can flow sequentially among the second flat tube 332, the first flat tube 331, the third flat tube 333, and the fourth flat tube 334 in either a forward or reverse direction. Compared to the single-row microchannel heat exchanger with only the first flat tubes 331 and the second flat tubes 332, the dual-row microchannel heat exchanger with the third flat tubes 333 and the fourth flat tubes 334 can increase the heat exchange time and heat exchange contact area between the refrigerant and air through the heat exchanger body 33, thereby effectively improving the heat exchange efficiency of the heat exchanger body 33.

[0059] It should be noted that the third flat tubes 333 and the fourth flat tubes 334 are arranged with reference to the first flat tubes 331 and second flat tubes 332. Therefore, in the first direction, taking one set of flat tubes consisting of one third flat tube 333 and one fourth flat tube 334 that are connected to and in communication with each other, as an example, in two adjacent sets of flat tubes, two third flat tubes 333 or two fourth flat tubes 334 are adjacent to each other, which can reduce heat loss caused by temperature differences between two adjacent sets of flat tubes, thereby improving the heat exchange efficiency of the heat exchanger body 33.

[0060] In some embodiments, in the first direction, the plurality of first flat tubes 331 can be located at the same height as the plurality of third flat tubes 333, respectively, and the plurality of second flat tubes 332 can be located at the same height as the plurality of fourth flat tubes 334, respectively. For example, in a third direction (e.g., the front-rear direction in FIG. 8), the first flat tubes 331 are arranged approximately aligned with the corresponding third flat tubes 333, and the second flat tubes 332 are arranged approximately aligned with the corresponding fourth flat tubes 334. In this way, driven by the fan assembly 60, air can flow through the gaps between two adjacent flat tubes along the direction away from the fan assembly 60 (e.g., from front to rear), allowing the air to flow smoothly along the third direction. The third flat tubes 333 can be located on a side (e.g., the front side) of the first flat tubes 331 adjacent to the fan assembly 60, or can be located on the side (e.g., the rear side) of the first flat tubes 331 away from the fan assembly 60, which is not limited in the present disclosure.

[0061] In some embodiments, in a set of flat tubes consisting of one first flat tube 331 and one second flat tube 332 connected thereto, the left end of the first flat tube 331 can be in communication with the left end of the second flat tube 332 through an elbow. Alternatively, an integrated structure formed by bending one flat tube structure can serve as both the first flat tube 331 and the second flat tube 332. Correspondingly, in one set of flat tubes consisting of one third flat tube 333 and one fourth flat tube 334 connected thereto, the left end of the third flat tube 333 can be in communication with the left end of the fourth flat tube 334 through an elbow. Alternatively, an integrated structure formed by bending one flat tube structure can serve as both the third flat tube 333 and the fourth flat tube 334. Here, the integrated structure is conducive to reducing the number of welding points on the flat tube, thereby lowering the risk of refrigerant leakage.

[0062] In some embodiments, as shown in FIGs. 8 and 9, the heat exchanger body 33 further includes a plurality of fins 336. The plurality of fins 336 can extend along the first direction, respectively, and the fin 336 is provided with a plurality of slots 337 spaced apart along the first direction. A side (e.g., a front or rear side) of the slot 337 adjacent to or away from the fan assembly 60 is open, and the plurality of slots 337 on the fin 336 can be open toward the same side. Any one of the first flat tube 331, the second flat tube 332, the third flat tube 333, or the fourth flat tube 334 can be inserted into the slots 337. During installation of the first flat tubes 331, and the second flat tubes 332 with the fins 336, the first flat tubes 331 and the second flat tubes 332 can be inserted into the corresponding slots 337 along the direction adjacent to the fan assembly 60 (e.g., from rear to front), and the first flat tubes 331 and the second flat tubes 332 can be in contact with and connected to the fins 336, thereby facilitating the installation of the first flat tubes 331 and second flat tubes 332 with the fins 336. The installation process of the third flat tubes 333 and fourth flat tubes 334 with the fins 336 is similar to that of the first flat tubes 331 and second flat tubes 332 and will not be repeated here.

[0063] In FIG. 8, the plurality of fins 336 are arranged along the third direction to form a dual-row microchannel heat exchanger. Optionally, in some embodiments, the plurality of fins 336 can also be spaced apart along the second direction to form a single-row microchannel heat exchanger, thereby increasing the heat exchange area of the heat exchanger body 33 and improving its heat exchange efficiency.

[0064] Moreover, the opening direction of the slots 337 can be away from the fan assembly 60, i.e., the sides of the slots 337 away from the fan assembly 60 are open). In this way, the fins 336 can be located on the windward sides (e.g., front sides) of the first flat tubes 331 and the second flat tubes 332, so that the first flat tubes 331 and the second flat tubes 332 can exchange heat in advance with the air blown by the fan assembly 60 through the fins 336. Thus, when the heat exchanger assembly 30 is the evaporator, some moisture in the air can condense on these fins 336 in advance, and the condensed water can flow downward along the smooth surfaces of the fins 336 in the first direction and drain away, so as to reduce the condensed water accumulated on the first flat tubes 331 and the second flat tubes 332, thereby reducing or avoiding frost formation thereon, which is conducive to improving the heat exchange efficiency of the microchannel heat exchanger.

[0065] Correspondingly, when the heat exchanger assembly 30 is a dual-row microchannel heat exchanger, the third flat tubes 333 and the fourth flat tubes 334 can also be inserted into the corresponding slots 337 along the direction toward the fan assembly60, and the third flat tubes 333 and fourth flat tubes 334 can be in contact with and connected to the fins 336 to form a single-row structure. The single-row structure formed by the third flat tubes 333 and the fourth flat tubes 334 can be provided on the side (e.g., front or rear side) of the single-row structure formed by the first flat tubes 331 and second flat tubes 332 toward or away from the fan assembly 60, and the first flat tube 331 and third flat tube 333 that are adjacent in the third direction are in communication with each other through the connecting tube 335, thereby forming a dual-row microchannel heat exchanger. It should be noted that when the plurality of fins 336 are installed with the third flat tubes 333 and fourth flat tubes 334, these fins 336 can be spaced apart along the second direction.

[0066] In some embodiments, in the second direction, the right ends of the second flat tubes 332 can be misaligned with the right ends of the first flat tubes. For example, as shown in FIGs. 6 and 7, in the second direction, the right ends of the second flat tube 332 are closer to the gas collecting tube 35 than the right ends of the first flat tubes 331. In this way, after the right ends of the second flat tubes 332 are connected to the first flow splitting assembly 37, a gap remains between the first flow splitting assembly 37 and the right end of the first flat tube 331, so as to facilitate the installation of the first flat tube 331.

[0067] Additionally, when the heat exchanger body 33 further includes the third flat tubes 333 and the fourth flat tubes 334, the right ends of the third flat tubes 333 can be aligned with the right ends of the first flat tubes 331 in the third direction, and the right ends of the fourth flat tubes 334 can be aligned with the right ends of the second flat tubes 332 in the third direction. As such, after the right ends of the second flat tubes 332 are connected to the first flow splitting assembly 37 and the right ends of the fourth flat tubes 334 are connected to the gas collecting tube 35, a gap remains between the right ends of the third flat tubes 333 and the gas collecting tube 35, and a gap remains between the right ends of the first flat tubes 331 and the first flow splitting assembly37, so as to facilitate the installation of the connecting tubes335.

[0068] The structure of the first flow splitting assembly 37 in some embodiments of the present application will be described in detail below.

[0069] FIG. 10 is a structural diagram illustrating the first flow splitting assembly in FIG. 8 connected to the branch tube and the plurality of second flat tubes. FIG. 11 is an exploded view of the first flow splitting assembly in FIG. 10.

[0070] In some embodiments, as shown in FIGs. 10 and 11, the first flow splitting assembly 37 is of a laminated structure. For example, as shown in FIGs. 10 and 11, the first flow splitting assembly 37 includes a first connecting plate 371, a second connecting plate372, and a third connecting plate 373. The first connecting plate 371, the second connecting plate 372, and the third connecting plate 373 are sequentially arranged and stacked on each other along the direction toward the heat exchanger body 33 (i.e., from right to left).

[0071] The first connecting plate 371 is provided with a first through hole 3711. The first through hole 3711 can be located adjacent to the middle of the first connecting plate 371. The second connecting plate 372 includes a second connecting plate body 3720, two first flow guiding channels 3721, and four second flow guiding channels 3722.

[0072] Taking the first flow guiding channels 3721 mainly extending along the first direction as an example, the second connecting plate 372 further includes a first region 3720A and a second region 3720B that are arranged along the first direction. For example, the first region 3720A can be the upper region of the second connecting plate body 3720, and the second region 3720B can be the lower region of the second connecting plate body 3720. Alternatively, the first region 3720A can be the lower region of the second connecting plate body 3720, and the second region 3720B can be the upper region of the second connecting plate body 3720.

[0073] The following is described by taking the first region 3720A as the upper region of the second connecting plate body 3720 and the second region 3720B as the lower region of the second connecting plate body 3720, as an example.

[0074] One first flow guiding channel 3721 is located in the first region 3720A, and the other first flow guiding channel 3721 is located in the second region 3720B. Ends of the two first flow guiding channels 3721 that are adjacent to each other can be in communication with the first through hole 3711. Moreover, the end (e.g., the right end) of the first through hole 3711 away from the second connecting plate 372 can be connected to and in communication with the branch tube 343, therefore the refrigerant from the branch tube 343 can be split and flow into the two first flow guiding channels 3721 through the first through hole 3711. Optionally, the first through hole 3711 can also be directly connected to and in communication with the throttling device 40.

[0075] In this case, as shown in FIG. 11, the end (e.g., the upper end) of the first flow guiding channel 3721 located in the first region 3720A that is away from the first through hole 3711 can be in communication with two second flow guiding channels 3722. One of the two second flow guiding channels 3722 can extend from the upper end of the first flow guiding channel 3721 along a direction away from the first through hole 3711 (e.g., upward), while the other one of the second flow guiding channels 3722 can extend from the upper end of the first flow guiding channel 3721 along a direction toward the first through hole 3711 (e.g., downward). Thus, the refrigerant in the first flow guiding channel 3721 located in the first region 3720A can be split and flow into the two second flow guiding channels 3722 through the upper end of the first flow guiding channel 3721.

[0076] Correspondingly, the end (e.g., the lower end) of the first flow guiding channel 3721 located in the second region 3720B that is away from the first through hole 3711 can be in communication with another two second flow guiding channels 3722. One of the two second flow guiding channels 3722 can extend from the lower end of the first flow guiding channel 3721 along a direction away from the first through hole 3711 (e.g., downward), while the other one of the two second flow guiding channels 3722 can extend from the lower end of the first flow guiding channel 3721 along a direction toward the first through hole 3711 (e.g., upward). Thus, the refrigerant in the first flow guiding channel 3721 located in the second region 3720B can be split and flow into the two second flow guiding channels 3722 through the lower end of the first flow guiding channel 3721.

[0077] In this way, through the arrangement of the two first flow guiding channels 3721 and four second flow guiding channels 3722, the refrigerant can be split and flow along the first direction into most areas of the second connecting plate body 3720.

[0078] As shown in FIG. 11, the third connecting plate 373 can be provided with a plurality of first connecting holes 3731. The plurality of first connecting holes 3731 are spaced apart along the first direction and correspond to the four second flow guiding channels 3722. For example, one second flow guiding channel 3722 corresponds to two first connecting holes 3731. The end of this second flow guiding channel 3722, away from the first flow guiding channel 3721 with which this second flow guiding channel 3722 is in communication, is in communication with the ends (e.g., the right ends) of the two first connecting holes 3731 toward the second connecting plate 372. As shown in FIG. 10, taking the first connecting hole 3731 as a strip-shaped hole corresponding to the second flat tube 332 as an example, the right end of the second flat tube 332 can be inserted into the first connecting hole 3731 to allow the first connecting hole 3731 to be in communication with the second flat tube 332. The plurality of first connecting holes 3731 correspond to the plurality of second flat tubes 332, and the plurality of first connecting holes 3731 are respectively connected to and in communication with the plurality of second flat tubes332. As such, the plurality of second flat tubes 332 are spaced apart in groups of two, and the two second flat tubes 332 in each group are adjacent to each other. Therefore, the plurality of first connecting holes 3731 are spaced apart in groups of two in the first direction and the two first connecting holes 3731 in each group are adjacent to each other and are in communication with the same second flow guiding channel 3722. In this way, as shown in FIG. 6, the two adjacent second flat tubes 332 in each group can be in communication with the two adjacent first connecting holes 3731 in each group, so that the two second flat tubes 332 can be in communication with the same second flow guiding channel 3722.

[0079] When the heat exchanger assembly 30 is used as the evaporator, the refrigerant from the first through hole 3711 can be split and enter the two first flow guiding channels 3721. The refrigerant flowing in one first flow guiding channel 3721 can be split and enter the corresponding two second flow guiding channels 3722. Then, the refrigerant flowing in one of the two second flow guiding channels 3722 can be split and flow into the corresponding two first connecting holes 3731, and then flow into the corresponding two second flat tubes 332 through the two first connecting holes 3731. Thus, the plurality of first connecting holes 3731 can allow the split refrigerant o flow into the plurality of second flat tubes 332. In this way, through the multi-stage splitting of the first flow splitting assembly 37, the uniformity of the gas-liquid two-phase refrigerant flowing into the plurality of second flat tubes 332 can be improved, so that the refrigerant flowing through the refrigerant channels in the upper and lower regions of the heat exchanger body 33 has a relatively small mass difference, which is conducive to improving the heat exchange efficiency of the heat exchanger assembly 30 when used as the evaporator, thereby improving the energy efficiency ratio of the air conditioner 1000.

[0080] It should be noted that the number of first connecting holes 3731 can also be the same as the number of second flow guiding channels 3722. For example, the end of one second flow guiding channel 3722, away from the first flow guiding channel 3721 which this second flow guiding channel 3722 is in communication with, can be in communication with one first connecting hole 3731. Optionally, in some embodiments, one second flow guiding channel 3722 can also be in communication with three, four, or more first connecting holes 3731. Additionally, when the arrangement of the first flat tubes 331 and second flat tubes 332 in the first direction is not considered, the heat exchanger assembly 30 can also adopt a finned heat exchanger composed of a round copper tube and a plurality of fins connected to the round copper tube. In this case, the first connecting hole 3731 can be of a circular hole structure, and the round copper tube can be inserted into the first connecting hole 3731.

[0081] In some embodiments, the surface (e.g., the left side surface) of the second connecting plate 372 away from the first connecting plate 371 is attached to the surface (e.g., the right side surface) of the third connecting plate 373 adjacent to the first connecting plate 371. Moreover, the first flow guiding channel 3721 and the second flow guiding channel 3722 extend through the second connecting plate body 3720. In this case, the first flow splitting assembly 37 further includes a blocking structure. The blocking structure is provided in an overlapping region of the first connecting hole 3731 and the first flow guiding channel 3721 in the second direction, so as to prevent the first flow guiding channel 3721 from being directly in communication with a part of the first connecting hole 3731 in the second direction.

[0082] FIG. 12 is a side view of the second connecting plate in FIG. 11.

[0083] In some embodiments, as shown in FIG. 12, the second connecting plate 372 further includes at least one of the first flow splitting portion 3723 or the second flow splitting portion 3724. The first flow splitting portion 3723 is provided between two first flow guiding channels 3721 and is located on the side of the first through hole 3711 adjacent to the second connecting plate 372. For example, the first flow splitting portion 3723 is provided between the ends (i.e., the liquid inlet ends) of the two first flow guiding channels 3721 adjacent to the first through hole 3711, so as to separate the two first flow guiding channels 3721. The first flow splitting portion 3723 can be configured to split the refrigerant from the first through hole 3711, so that the split refrigerant flows into the two first flow guiding channels 3721, respectively. The number of the second flow splitting portions 3724 corresponds to the number of the first flow guiding channels 3721. For example, the second connecting plate 372 includes two second flow splitting portions 3724. In this case, the second flow splitting portion 3724 is provided between two second flow guiding channels 3722 in communication with the same first flow guiding channel 3721. That is, the second flow splitting portion 3724 is provided at the end (e.g., the liquid outlet end) of the corresponding first flow guiding channel 3721 away from the first through hole 3711. The second flow splitting portion 3724 can be configured to split the refrigerant from the first flow guiding channel 3721, so that the split refrigerant flows into the two second flow guiding channels 3722 in communication with the first flow guiding channel 3721, respectively.

[0084] In some embodiments, the first flow splitting portion 3723 is of a sheet-shaped structure, and the first flow splitting portion 3723 overlaps with a central axis H1 (as shown in FIG. 11) of the first through hole 3711 in the second direction. Thus, when the surface (e.g., the right side surface) of the first connecting plate 371 away from the branch tube 343 is attached to the surface (e.g., the left side surface) of the second connecting plate 372 adjacent to the branch tube 343, the first flow splitting portion 3723 with the sheet-shaped structure can not only separate the two first flow guiding channels 3721, but also overlap with the central axis H1 of the first through hole 3711 in the second direction, thereby facilitating improving uniformity in refrigerant splitting.

[0085] Moreover, the first flow splitting portion 3723 with the sheet-shaped structure can be substantially parallel to the first direction, so that the refrigerant split by the first flow splitting portion 3723 can flow into the two first flow guiding channels 3721 along the third direction, respectively, thereby avoiding the influence of gravity on the uniform splitting of the gas-liquid two-phase refrigerant at the liquid inlet and liquid outlet ends of the first flow guiding channel 3721.

[0086] In some embodiments, the first flow splitting portion 3723 and the second connecting plate body 3720 can be of an integrated structure. Alternatively, the first flow splitting portion 3723 can be connected to the second connecting plate body 3720 through processes such as welding or bonding.

[0087] In some embodiments, as shown in FIG. 12, the two first flow guiding channels 3721 are centrally symmetric with respect to the center of the first flow splitting portion 3723. For example, the first flow guiding channel 3721 includes a first flow guiding portion 3721A and a second flow guiding portion 3721B that are in communication with each other, and the first flow guiding portion 3721A is closer to the first through hole 3711 than the second flow guiding portion 3721B. The first flow guiding portion 3721A includes a first sub-portion 37211 and a second sub-portion 37212 that are in communication with each other. The first sub-portion 37211 is a portion of the first flow guiding portion 3721A adjacent to the first through hole 3711 and is in communication with the first through hole 3711. The first sub-portion 37211 can be of a linear structure and extend along the third direction to improve the uniformity of the refrigerant flowing from the first through hole 3711 to the two first flow guiding portions 3721A. The second sub-portion 37212 is a portion of the first flow guiding portion 3721A adjacent to the second flow guiding channel 3722 and is in communication with the second flow guiding channel 3722. The second sub-portion 37212 can be of a linear structure and extend along the first direction.

[0088] The second flow guiding portion 3721B is of a linear structure and extends along the first direction, and the second flow guiding portion 3721B is configured to smoothly transport the refrigerant guided through the first flow guiding portion 3721A to reduce fluctuation of a flow rate of the refrigerant. In this case, the first flow guiding channel 3721 further includes a plurality of bent portions 3721C. The bent portions 3721C each are of a curved tube structure with an approximately arc right-angle and are configured to adjust the flow direction of the refrigerant. As shown in FIG. 12, one bent portion 3721C is provided between the first sub-portion 37211 and the second sub-portion 37212 to enable the first sub-portion 37211 to be in communication with the second sub-portion 37212. Another bent portion 3721C is located between the second sub-portion 37212 and the second flow guiding portion 3721B to enable the first flow guiding portion 3721A to be in communication with the second flow guiding portion 3721B.

[0089] In some embodiments, as shown in FIG. 12, the second connecting plate 372 further includes two third flow guiding channels 3725, and the two third flow guiding channels 3725 correspond to the two first flow guiding channels 3721, respectively. The third flow guiding channel 3725 is provided between the first flow guiding portion 3721A and the second flow guiding portion 3721B and is adjacent to the bent portion 3721C in communication with the second flow guiding portion 3721B, so that the bent portion 3721C can be in communication with the second flow guiding portion 3721B and the third flow guiding channel 3725, so that the refrigerant entering the second flow guiding portion 3721B can be evenly distributed in the second flow guiding portion 3721B. Thus, the second flow guiding portion 3721B can be located between the bent portion 3721C and the third flow guiding channel 3725 in the third direction. The second flow guiding portion 3721B can be provided approximately perpendicular to the corresponding third flow guiding channel 3725, and the third flow guiding channel 3725 can be located at the same height as the bent portion 3721C with which the third flow guiding channel 3725 is in communication, so that the second flow guiding portion 3721B, the third flow guiding channel 3725, and the bent portion 3721C can form a structure approximately an inverted T-shape or a T-shape.

[0090] FIG. 13 shows a flow velocity vector diagram of the refrigerant in the third flow guiding channel in FIG. 12. As shown in FIG. 13, in the first flow guiding channel 3721 located in the first region 3720A, the third flow guiding channel 3725 can cause the flowing refrigerant to form a vortex within the third flow guiding channel 3725. The refrigerant passing through the first flow guiding portion 3721A flows a short distance in the third direction after passing through the bent portion 3721C and then flows into the second flow guiding portion 3721B. Therefore, before flowing into the second flow guiding portion 3721B, the refrigerant generates a deviating force in the third direction, which is prone to cause uneven distribution of the refrigerant after flowing into the second flow guiding portion 3721B. The vortex can be formed by the third flow guiding channel 3725, and the flow of the refrigerant in the vortex flow guidingcan counteract part of the deviating force of the refrigerant in the third direction, thereby improving the uniformity of the refrigerant flowing into the second flow guiding portion 3721B in the third direction. Moreover, the second flow guiding portion 3721B with a relatively long linear structure can further improve the uniformity of the distribution of the refrigerant flowing in the second flow guiding portion3721B.

[0091] Therefore, the end (e.g., the liquid outlet end) of the second flow guiding portion 3721B away from the first flow guiding portion 3721A can be in communication with the corresponding two second flow guiding channels 3722 in the third direction. For example, as shown in FIG. 12, one end (e.g., the front end) of the liquid outlet end of the second flow guiding portion 3721B in the third direction can be in communication with one second flow guiding channel 3722, and the other end (e.g., the rear end) of the liquid outlet end in the third direction can be in communication with another second flow guiding channel 3722. Additionally, the second flow splitting portion 3724 can be of a sheet-shaped structure. The second flow splitting portion 3724 with the sheet-shaped structure can be perpendicular to the third direction and overlap with the central axis H2 of the corresponding second flow guiding portion 3721B. Thus, the refrigerant flowing in the second flow guiding portion 3721B can be evenly split along the third direction when passing through the second flow splitting portion 3724, so as to flow into the corresponding two second flow guiding channels 3722, respectively.

[0092] FIG. 14 shows a flow velocity vector diagram of the refrigerant in the first flow guiding channel and the second flow guiding channel in FIG. 12. As shown in FIG. 14, with the above structure, the refrigerant flowing through the first flow splitting portion 3723 and the second flow splitting portion 3724 can be evenly split to reduce the influence of gravity on the splitting function of these two splitting structures. It should be noted that the first flow splitting portion 3723 and the second flow splitting portion 3724 can also be of a triangular prism structure. In this case, one corner of the first flow splitting portion 3723 protrudes toward the direction (e.g., to the right) adjacent to the first through hole 3711 and is parallel to the first direction. One corner of the second flow splitting portion 3724 protrudes toward the direction (e.g., downward or upward) adjacent to the first flow guiding channel 3721 and is parallel to the second direction.

[0093] FIG. 15 is another exploded view of the first flow splitting assembly in FIG. 10. FIG. 16 is a side view of the fourth connecting plate in FIG. 15. Compared with FIG. 11, the first flow splitting assembly 37 in FIG. 15 includes more connecting plates. In some embodiments, as shown in FIG. 15, the first flow splitting assembly 37 further includes a fourth connecting plate 374.

[0094] The fourth connecting plate 374 is provided between the second connecting plate 372 and the third connecting plate 373. As shown in FIG. 16, the fourth connecting plate 374 includes a fourth connecting plate body 3740 and a plurality of second connecting holes 3741. The plurality of second connecting holes 3741 are provided on the fourth connecting plate body 3740 and correspond to the plurality of first connecting holes 3731. For example, the number and arrangement of the plurality of second connecting holes 3741 are the same as those of the plurality of first connecting holes 3731. The first connecting hole 3731 can be in communication with the second flow guiding channel 3722 corresponding to first connecting hole through the corresponding second connecting hole 3741. It should be noted that the number of the second connecting holes 3741 and the number of the first connecting holes 3731 can each be an integer multiple of four or eight.

[0095] By providing the second connecting holes 3741, a large accommodation cavity 38 (as shown in FIG. 17) can be formed between the first connecting hole 3731 and the second connecting hole 3741. When the right end of the second flat tube 332 is inserted into the first connecting hole 3731, the second flat tube 332 is hermetically connected to the first connecting hole 3731, which facilitates the installation of the second flat tube 332. Moreover, after the second flat tube 332 is inserted into the first connecting hole 3731, a portion of the second flat tube 332 can be inserted into the corresponding second connecting hole 3741, so that the refrigerant can flow evenly into the plurality of second flat tubes 332 through the plurality of second connecting holes 3741, thereby facilitating uniform distribution of the refrigerant. Additionally, the second flat tube 332 can reduce the volume of the accommodation cavity 38 to prevent uneven distribution of the refrigerant due to gas-liquid separation of the gas-liquid two-phase refrigerant in the accommodation cavity 38.

[0096] The plurality of second connecting holes 3741 correspond to the plurality of first connecting holes 3731, and two first connecting holes 3731 correspond to one second flow guiding channel 3722. As a result, one second flow guiding channel 3722 can be in communication with two second connecting holes 3741. In this case, the fourth connecting plate 374 further includes a plurality of first flow splitting channels 3742, and the plurality of first flow splitting channels 3742 correspond to the plurality of second connecting holes 3741. For example, one first flow splitting channel 3742 is in communication with one second connecting hole 3741. Two first flow splitting channels 3742 are provided between the two second connecting holes 3741 in communication with the same second flow guiding channel 3722 along the first direction. One end of each of the two first flow splitting channels 3742 is in communication with the corresponding second connecting hole 3741, and the other ends of the two first flow splitting channels 3742 away from the corresponding second connecting hole 3741 can be adjacent to each other and is in communication with the corresponding second flow guiding channel 3722. Thus, the second flow guiding channel 3722 can be in communication with the corresponding two second connecting holes 3741, so that the refrigerant in the second flow guiding channel 3722 can be further split and flows into the two first flow splitting channels 3742.

[0097] It should be noted that when only two first flow splitting channels 3742 are provided between the two second connecting holes 3741 in communication with the same second flow guiding channel 3722, the end of each of the two first flow splitting channels 3742 away from the corresponding second connecting holes 3741 can be in communication with the same second flow guiding channel on the fourth connecting plate body 3740.

[0098] In some embodiments, the structural shape of the second connecting hole 3741 can be the same as that of the first connecting hole 3731. For example, both the second connecting hole 3741 and the first connecting hole 3731 can be strip-shaped holes to facilitate installation of the second flat tube 332. Alternatively, both the second connecting hole 3741 and the first connecting hole 3731 can be circular holes to facilitate installation of round copper tubes.

[0099] In some embodiments, as shown in FIG. 16, the fourth connecting plate 374 further includes a plurality of second flow splitting channels 3743, and the plurality of second flow splitting channels 3743 can correspond to the plurality of second flow guiding channels 3722. The second flow splitting channel 3743 is provided between two first flow splitting channels 3742 in communication with the same second flow guiding channel 3722 and is in communication with these two first flow splitting channels 3742. For example, in the two first flow splitting channels 3742 in communication with the same second flow guiding channel 3722, one end of the second flow splitting channel 3743 is in communication with the other ends of the two first flow splitting channels 3742 that are adjacent to each other, and the other end of the second flow splitting channel 3743 can extend along the third direction and can be in communicate with the corresponding second flow guiding channel 3722, so that the refrigerant can be split sequentially through the second flow guiding channel 3722 and the second flow splitting channel 3743 and then flow into the two first flow splitting channels 3742.

[0100] In some embodiments, as shown in FIG. 16, the fourth connecting plate 374 further includes a plurality of third flow splitting portions 3744. The third flow splitting portion 3744 can be of a sheet-shaped structure or a triangular prism structure, and the plurality of third flow splitting portions 3744 are provided corresponding to the plurality of second flow splitting channels 3743. For example, one third flow splitting portion 3744 is provided at an end of one second flow splitting channel 3743 adjacent to the corresponding two first flow splitting channels 3742 and is located between the two first flow splitting channels 3742 corresponding to the second flow splitting channel 3743. The third flow splitting portion 3744 is configured to partially separate the corresponding two first flow splitting channels 3742 to split the refrigerant flowing from the second flow splitting channel 3743 into the corresponding two first flow splitting channels 3742. Thus, by providing the third flow splitting portion 3744, the uniformity of the refrigerant split from the same second flow splitting channel 3743 into the two first flow splitting channels 3742 can be improved.

[0101] Taking the third flow splitting portion 3744 being in a sheet-shaped structure as an example, the third flow splitting portion 3744 can be perpendicular to the first direction, so that the refrigerant flowing along the third direction in the second flow splitting channel 3743 can be evenly split upward and downward and flow into the two first flow splitting channels 3742 after passing through the third flow splitting portion 3744, so as to reduce the influence of gravity on the splitting effect. It should be noted that the installation position and angle of the third flow splitting portion 3744 can also be adjusted according to the arrangement of the first flow splitting portion 3723 and the second flow splitting portion 3724.

[0102] In some embodiments, as shown in FIG. 15, the first flow splitting assembly 37 further includes a fifth connecting plate 375. The fifth connecting plate 375 can be provided between the second connecting plate 372 and the fourth connecting plate 374, and is configured to separate the channel structures (e.g., the first flow guiding channels 3721) on the second connecting plate 372 from the hole structures (e.g., the second connecting holes 3741) or channel structures (e.g., the first flow splitting channels 3742 and the second flow splitting channel 3743) on the fourth connecting plate 374, so as to prevent the sides (e.g., the right sides) of the second connecting hole 3741, the first flow splitting channel 3742, and the second flow splitting channel 3743 adjacent to the second connecting plate 372 from being in communication with the first flow guiding channel 3721, which may adversely affect the splitting effect of the refrigerant. For example, as shown in FIG. 15, the fifth connecting plate 375 is provided with a plurality of second through holes 3751, and the plurality of second through holes 3751 can correspond to the plurality of second flow guiding channels 3722. For instance, one second through hole 3751 can be in communication with one second flow guiding channel 3722. Thus, the end of the second flow splitting channel 3743 away from the corresponding first flow splitting channel 3742 can be in communication with the corresponding second flow guiding channel 3722 through one second through hole 3751.

[0103] By providing the fifth connecting plate 375, the first flow guiding channel 3721 can be separated from the second connecting hole 3741, from the first flow splitting channel 3742, and from the second flow splitting channel 3743. Additionally, the fifth connecting plate 375 can also be configured to separate the second flow guiding channel 3722 from the second connecting hole 3741, as well as from the first flow splitting channel 3742. Furthermore, when the second flow splitting channel 3743 is in communication with one end (or part of the region) of one corresponding second flow guiding channel 3722 only through the second through hole 3751, the second flow splitting channel 3743 can also be separated from other positions of this second flow guiding channel 3722 or from other second flow guiding channels 3722 by the fifth connecting plate 375.

[0104] It should be noted that when a three-stage splitting of the refrigerant can be achieved in the first flow splitting assembly 37, the hole structures and channel structures on the first connecting plate 371, the second connecting plate 372, the third connecting plate 373, the fourth connecting plate 374, and the fifth connecting plate 375 can be through hole structures arranged along the second direction. Thus, the first connecting plate 371, the second connecting plate 372, the third connecting plate 373, the fourth connecting plate 374, and the fifth connecting plate 375 can be quickly processed by stamping, which simplifies the structure and facilitates production.

[0105] Optionally, in some embodiments, the first flow splitting assembly 37 can exclude the fifth connecting plate 375. In this case, the surface (e.g., the right side surface) of the fourth connecting plate 374 away from the third connecting plate 373 is attached to the left side surface of the second connecting plate 372. The second connecting hole 3741 and the first flow splitting channel 3742 can be of a blind hole structure, and the side (e.g., the right side) of the blind hole structure adjacent to the second connecting plate 372 is closed. Additionally, the end of the second flow splitting channel 3743 away from the first flow splitting channel 3742 is of a through hole structure to be in communication with the corresponding second flow guiding channel 3722.

[0106] FIG. 17 shows a schematic diagram of a flow channel structure of the first flow splitting assembly in FIG. 10. After flowing through the flow channel structure of the first flow splitting assembly 37 shown in FIG. 17 and undergoing three-stage splitting, the refrigerant can evenly flow into the plurality of second flat tubes 332 in the heat exchanger body 33.

[0107] When the first flow splitting assembly 37 is connected to eight second flat tubes 332 through eight first connecting holes, the splitting effect of the first flow splitting assembly 37 is simulated and calculated at three flow velocities of the refrigerant: a first flow velocity, e.g., 1.651 m / s, a second flow velocity, e.g., 0.826 m / s, and a third flow velocity, e.g., 0.413 m / s. The simulation results show that: the non-uniformity of the flow rate of the refrigerant after being split by the first flow splitting assembly 37 is 2%, 2.8%, and 3.5%, respectively, and the flow rate curves at the outlets of the eight second flat tubes 332 are roughly symmetrical. Thus, the uniformity of the flow rate of the refrigerant meets the usage requirements. It should be noted that different flow velocities of the refrigerant cause different loads on the first flow splitting assembly 37. The higher the flow velocity of the refrigerant, the greater the load caused by the refrigerant flowing in the first flow splitting assembly 37.

[0108] The foregoing is described by taking the case where the second connecting plate 372 in the first flow splitting assembly 37 includes the first flow guiding channel 3721 and the second flow guiding channel 3722 as an example. Optionally, in some embodiments, the first flow splitting assembly37 can also be of other structures.

[0109] FIG. 18 is another exploded view of the first flow splitting assembly in FIG. 10. Compared to those in FIGs. 11 and 15, the connecting plates included in the first flow splitting assembly 37 in FIG. 18 have different structures. In some embodiments, as shown in FIG. 18, the first flow splitting assembly 37 includes the first connecting plate 371, the second connecting plate 372, the third connecting plate 373, and the fourth connecting plate 374. The first connecting plate 371, the second connecting plate 372, the fourth connecting plate 374, and the third connecting plate 373 are arranged sequentially along the direction (from right to left) toward the heat exchanger body 33 and stacked on each other. The structures of the first connecting plate 371 and the third connecting plate 373 can be referred to in the preceding description and will not be reiterated here.

[0110] The second connecting plate 372 includes the second connecting plate body 3720, the first region 3720A, the second region 3720B, two first flow guiding channels 3721, and the first flow splitting portion 3723. The structures and functions of the second connecting plate body 3720, the first region 3720A, the second region 3720B, and the first flow splitting portion 3723 can be referred to in the preceding description and will not be reiterated here.

[0111] The first flow guiding channel 3721 can be of a through hole structure, and the two first flow guiding channels 3721 located in the first region 3720A and the second region 3720B, respectively. The two first flow guiding channels 3721 extend in directions away from the first through hole 3711, respectively. For example, the first flow guiding channel 3721 located in the first region 3720A extends upward, while the first flow guiding channel 3721 located in the second region 3720B extends downward. Additionally, the two first flow guiding channels 3721 are symmetrically distributed. For example, the two first flow guiding channels 3721 can form an axisymmetric or centrally symmetric structure on the second connecting plate 372.

[0112] The third connecting plate 373 is provided with a plurality of first connecting holes 3731, and the fourth connecting plate 374 includes the fourth connecting plate body 3740 and a plurality of second connecting holes 3741. The arrangement and corresponding relationship of the first connecting holes 3731 and the second connecting holes 3741 can be referred to in the preceding description and will not be reiterated here. Among the plurality of second connecting holes 3741, half of the second connecting holes 3741 can be in communication with one first flow guiding channel 3721, while the other half of the second connecting holes 3741 can be in communication with the other first flow guiding channel 3721.

[0113] It should be noted that, except for the fact that the first flow guiding channel 3721 does not need to be in communication with the first connecting hole 3731 and the second connecting hole 3741 through the second flow guiding channel 3722, the structure and function of the first flow guiding channel 3721 are similar to those in the preceding description.

[0114] In some embodiments, as shown in FIG. 18, a portion of the first flow guiding channel 3721 adjacent to the first flow splitting portion 3723 can be of a curved channel structure 3726 to reduce the flow velocity of the refrigerant in the first flow guiding channel 3721, allowing the refrigerant to flow slowly, which is conducive to improving the uniformity of refrigerant splitting.

[0115] In some embodiments, as shown in FIG. 18, the fourth connecting plate 374 further includes a plurality of first preset holes 3745, and the first preset holes 3745 are configured to adjust the pressures of the refrigerant in two adjacent second connecting holes 3741. At least one first preset hole 3745 can be provided between two second connecting holes 3741 corresponding to two adjacent second flat tubes 332, and the two second connecting holes 3741 are in communication through the at least one first preset hole 3745, so that the pressures of the refrigerant in the two second connecting holes 3741 are approximately the same, which is conducive to uniform splitting of the refrigerant in the adjacent second connecting holes 3741.

[0116] When only the fourth connecting plate 374 is provided between the second connecting plate 372 and the third connecting plate 373, the first preset hole 3745 can be in direct communication with the corresponding two adjacent second connecting holes 3741. Thus, when more refrigerant in one of the two second connecting holes 3741 leads to high pressure in the corresponding accommodation cavity 38 (as shown in FIG. 20), part of refrigerant can flow into the other second connecting hole 3741 through the first preset hole 3745, so that the pressures in the two adjacent second connecting holes 3741 are approximately the same, thereby being conducive to uniform distribution of the refrigerant.

[0117] It should be noted that when the first preset hole 3745 can cooperate with other structures similar to the first preset hole 3745 to achieve uniform distribution of the refrigerant in the corresponding two adjacent second connecting holes 3741, the first preset hole 3745 and the second connecting hole 3741 can be spaced apart on the fourth connecting plate body 3740. When the first preset hole 3745 can achieve uniform distribution of the refrigerant in the corresponding two adjacent second connecting holes 3741 without cooperating with other structures similar to the first preset hole 3745, the two ends of the first preset hole 3745 can be in direct communication with the two adjacent second connecting holes 3741 on the fourth connecting plate body 3740.

[0118] FIG. 19 is still another exploded view of the first flow splitting assembly in FIG. 10. The first connecting plate 371 and the third connecting plate 373 are not shown in FIG. 19. FIG. 20 is a schematic diagram of a flow channel structure of the first flow splitting assembly in FIG. 19.

[0119] In some embodiments, as shown in FIG. 19, the first flow splitting assembly 37 further includes a sixth connecting plate 376 and a seventh connecting plate 377. The sixth connecting plate 376 and the seventh connecting plate 377 are provided between the second connecting plate 372 and the fourth connecting plate 374, and the sixth connecting plate 376 is closer to the second connecting plate 372 than the seventh connecting plate 377.

[0120] The sixth connecting plate 376 is provided with a plurality of third through holes 3761, and the plurality of third through holes 3761 correspond to the two first flow guiding channels 3721. For example, one first flow guiding channel 3721 is in communication with one third through hole 3761, and the third through hole 3761 can be adjacent to the end of the first flow guiding channel 3721 away from the first through hole 3711.

[0121] The seventh connecting plate 377 includes a seventh connecting plate body 3770, two fourth flow guiding channels 3771, two fifth flow guiding channels 3772, a fourth flow splitting portion 3773, and a fifth flow splitting portion 3774. The two fourth flow guiding channels 3771 and two fifth flow guiding channels 3772 are provided on the seventh connecting plate body 3770 and are of through hole structures. The two fourth flow guiding channels 3771 are in communication with the first flow guiding channel 3721 located in the first region 3720A through one third through hole 3761. The two fourth flow guiding channels 3771 are symmetrically (e.g., axially symmetrically or centrally symmetrically) distributed and are separated by the fourth flow splitting portion 3773. For example, the fourth flow splitting portion 3773 is provided between the ends of the two fourth flow guiding channels 3771 adjacent to the corresponding third through hole 3761 and is located on the side (e.g., the left side) of the third through hole 3761 away from the second connecting plate 372. The fourth flow splitting portion 3773 is configured to split the refrigerant flowing from the corresponding third through hole 3761 into the two fourth flow guiding channels 3771. The two fifth flow guiding channels 3772 are in communication with the first flow guiding channel 3721 located in the second region 3720B through another third through hole 3761. The two fifth flow guiding channels 3772 are symmetrically (e.g., axially symmetrically or centrally symmetrically) distributed and are separated by the fifth flow splitting portion 3774. For example, the fifth flow splitting portion 3774 is provided between the ends of the two fifth flow guiding channels 3772 adjacent to the corresponding third through hole 3761 and is located on the side (e.g., the left side) of the third through hole 3761 away from the second connecting plate 372. The fifth flow splitting portion 3774 is configured to split the refrigerant flowing from the corresponding third through hole 3761 into the two fifth flow guiding channels 3772.

[0122] Taking the case where two second connecting holes 3741 connected to two adjacent second flat tubes 332 serve as a group of second connecting holes 3741 as an example, one fourth flow guiding channel 3771 can be in communication with one or more groups of second connecting holes 3741, and one fifth flow guiding channel 3772 can also be in communication with one or more groups of second connecting holes 3741. Thus, the two fourth flow guiding channels 3771 and two fifth flow guiding channels 3772 can be spaced apart along the first direction and are in communication with multiple (e.g., 8) second connecting holes 3741 to connect multiple (e.g., 8) second flat tubes 332, so as to facilitate efficient splitting of the refrigerant. It should be noted that the two fourth flow guiding channels 3771 as well as two fifth flow guiding channels 3772 can be axially or centrally symmetric or arranged according to the first flow guiding channel 3721, which is not limited in this application.

[0123] The following will be described by an example in which eight first connecting holes 3731 and eight second connecting holes 3741 are provided. As shown in FIG. 19, the seventh connecting plate 377 further includes a plurality of third connecting holes 3775. The plurality of third connecting holes 3775 correspond to and in communication with the plurality of second connecting holes 3741, respectively. The plurality of third connecting holes 3775 can be strip-shaped holes to match the shape of the second connecting holes 3741. In this case, one fourth flow guiding channel 3771 can be in communication with two third connecting holes 3775, and the two third connecting holes 3775 are adjacent to each other and are located at the same end of the fourth flow guiding channel 3771, such as the end of the fourth flow guiding channel 3771 away from the fourth flow splitting portion 3773. Moreover, one fifth flow guiding channel 3772 can also be in communication with two adjacent third connecting holes 3775, and the two third connecting holes 3775 are adjacent to each other and are located at the same end of the fifth flow guiding channel 3772, such as the end of the fifth flow guiding channel 3772 away from the fifth flow splitting portion 3774.

[0124] In this case, as shown in FIG. 20, the first connecting hole 3731, the second connecting hole 3741, and the third connecting hole 3775 cooperatively define an accommodation cavity 38, and each is a part of the accommodation cavity 38. Thus, by providing the plurality of third connecting holes 3775, the volume of the accommodation cavity 38 between the first connecting hole 3731 and the second connecting hole 3741 can be increased, thereby facilitating uniform splitting of the refrigerant. It should be noted that since the third connecting holes 3775 are not provided in FIG. 17, the first connecting hole 3731 and the second connecting hole 3741 cooperatively define the accommodation cavity 38 in FIG. 17.

[0125] In some embodiments, as shown in FIG. 19, when the fourth connecting plate 374 includes a plurality of first preset holes 3745, the seventh connecting plate 377 further includes a plurality of second preset holes 3776, and one first preset hole 3745 corresponds to two second preset holes 3776. For example, one first preset hole 3745 is in communication with two second preset holes 3776, and the two second preset holes 3776 are adjacent to and located on the side (e.g., the right side) of the first preset hole 3745 adjacent to the second connecting plate 372.

[0126] Taking the case where two adjacent third connecting holes 3775 in communication with one fourth flow guiding channel 3771 or one fifth flow guiding channel 3772 serve as a group of third connecting holes 3775, and two adjacent second preset holes 3776 serve as a group of second preset holes 3776 as an example, a group of second preset holes 3776 is provided between the corresponding group of third connecting holes 3775. One second preset hole 3776 in the same group can be in communication with one third connecting hole 3775, and the other second preset hole 3776 can be in communication with the other third connecting hole 3775. Moreover, the two second preset holes 3776 in the same group are spaced apart. For example, the ends of the two second preset holes 3776 in the same group away from the corresponding third connecting holes 3775 are spaced apart. Additionally, the two second preset holes 3776 in the same group can be located on the same side of the corresponding fourth flow guiding channel 3771 or the corresponding fifth flow guiding channel 3772, and the ends of the two second preset holes 3776 away from the corresponding third connecting holes 3775 can be in communication with the same first preset hole 3745.

[0127] Thus, by providing the first preset holes 3745 and the second preset holes 3776, the refrigerant can circulate between the two corresponding third connecting holes 3775 through a group of second preset holes 3776, the corresponding first preset hole 3745, and the corresponding fourth flow guiding channel 3771 or the corresponding fifth flow guiding channel 3772, so that the pressures of the refrigerant at the inlets of two adjacent second flat tubes 332 are approximately the same, which facilitates uniform distribution of the refrigerant.

[0128] In some embodiments, as shown in FIG. 19, the sixth connecting plate 376 is further provided with a plurality of third preset holes 3762. One third preset hole 3762 corresponds to two second preset holes 3776. For example, the ends of the two second preset holes 3776 in one group away from the corresponding third connecting holes 3775 can be in communication with the same third preset hole 3762. Thus, the communication between the second preset holes 3776 and the third preset holes 3762 can further adjust the pressures of the refrigerant in the two adjacent third connecting holes 3775, so that the pressures of the refrigerant at the inlets of two adjacent second flat tubes 332 are approximately the same, which facilitates improving the uniformity of refrigerant distribution.

[0129] The following exemplarily explains the process of the refrigerant flowing in the first flow splitting assembly 37 by an example where the first connecting plate 371, the second connecting plate 372, the sixth connecting plate 376, the seventh connecting plate 377, the fourth connecting plate 374, and the third connecting plate 373 are sequentially attached from right to left, the first flow guiding channel 3721, the fourth flow guiding channel 3771, and the fifth flow guiding channel 3772 mainly extend along the first direction, and the first connecting hole 3731, the second connecting hole 3741, and the third connecting hole 3775 extend along the third direction.

[0130] As shown in FIG. 20, the refrigerant can flow into the first flow splitting assembly 37 from right to left through the first through hole 3711. The left end of the first through hole 3711 is communication with two adjacent first flow guiding channels 3721. After being split by the first flow splitting portion 3723 between the two first flow guiding channels 3721, the refrigerant from the first through hole 3711 can evenly flow into the two first flow guiding channels 3721 respectively.

[0131] In the first flow guiding channel 3721 adjacent to the upper side of the first through hole 3711, the refrigerant first passes through the curved channel structure 3726 to buffer and decrease in speed, then flows upward along the first flow guiding channel 3721, and then flows into two adjacent fourth flow guiding channels 3771 through another third through hole 3761 at the upper end of this first flow guiding channel 3721, respectively.

[0132] Under the action of the fourth flow splitting portion 3773 between the two fourth flow guiding channels 3771, the refrigerant can evenly flow into the two fourth flow guiding channels 3771, respectively. In the fourth flow guiding channel 3771 adjacent to the lower side of the corresponding third through hole 3761, the refrigerant first passes through a bent flow path to buffer and decrease in speed, then flows downward along the fourth flow guiding channel 3771. Since this fourth flow guiding channel 3771 is in communication with two adjacent and spaced third connecting holes 3775, the refrigerant in this fourth flow guiding channel 3771 can sequentially flow into the two third connecting holes 3775 and fill the accommodation cavity 38 where these two third connecting holes 3775 are located along the third direction.

[0133] As shown in FIG. 20, between two adjacent third connecting holes 3775, two second preset holes 3776, one first preset hole 3745, and one third preset hole 3762 form a pressure dividing flow channel structure 39. The pressure dividing flow channel structure 39 is in communication with the two corresponding third connecting holes 3775, allowing the refrigerant to circulate between these two third connecting holes 3775, so that the pressures of the refrigerant in the two corresponding accommodation cavities 38 are approximately the same, which facilitates uniform splitting of the refrigerant. The pressure dividing flow channel structure 39 can be arranged between any two adjacent third connecting holes 3775, and a plurality of pressure dividing flow channel structures 39 can be provided between two adjacent third connecting holes 3775. For example, one pressure dividing flow channel structure 39 is provided on the front side of two adjacent third connecting holes 3775, and another pressure dividing channel structure 39 is provided on the rear side of two adjacent third connecting holes 3775. Since two adjacent accommodation cavities 38 can be in communication with two adjacent second flat tubes 332 through two first connecting holes 3731, respectively, the pressures of the refrigerant at the inlets of these two second flat tubes 332 are approximately the same, and the refrigerant can flow evenly into the two adjacent second flat tubes 332.

[0134] It should be noted that when the flow rate of the refrigerant in one accommodation cavity 38 or second flat tube 332 is relatively large, the resistance of the refrigerant flowing through the second flat tube 332 increases because the resistance loss along the way is proportional to the flow rate of the refrigerant, making it difficult for the refrigerant to flow into this second flat tube 332. By providing the pressure dividing flow channel structure 39, the refrigerant in the accommodation cavity 38 can flow into an adjacent accommodation cavity 38 with a small refrigerant flow rate, thereby achieving uniform splitting of the refrigerant between the two adjacent second flat tubes 332. Similarly, when the flow rate of the refrigerant in the second flat tube 332 is relatively small, the resistance of the refrigerant flowing through the second flat tube 332 is relatively small, the accommodation cavity 38 in communication with the second flat tube 332 can draw refrigerant from another adjacent accommodation cavity 38, thereby effectively resolving the issue through the pressure dividing flow channel structure 39.

[0135] It should be noted that the sizes of the flow channels in the first flow splitting assembly 37 can be approximate to the size of the pressure reducing tube (e.g., the capillary tube), so that the refrigerant flowing in the first flow splitting assembly 37 has no space for gas-liquid separation. Additionally, for the heat exchanger assembly 30 with top or side air outlet, the air field at multiple flat tubes in communication with the same first flow splitting assembly 37 varies little, which is further conducive to uniform distribution of the refrigerant.

[0136] When one pressure dividing flow channel structure 39 is provided between the front ends as well as the rear ends of two adjacent third connecting holes 3775, and the first flow splitting assembly 37 is connected to eight second flat tubes 332 through eight third connecting holes 3775, the splitting effect of the first flow splitting assembly 37 is simulated and calculated at three flow velocities of the refrigerant: a first flow velocity, e.g., 1.651 m / s, a second flow velocity, e.g., 0.826 m / s, and a third flow velocity, e.g., 0.413 m / s. Additionally, when the pressure dividing flow channel structure 39 is not provided between two adjacent third connecting holes 3775, the same simulation calculation is performed on the splitting effect of the first flow splitting assembly 37. In the first flow splitting assembly 37 provided with the pressure dividing flow channel structure 39, the non-uniformity of the flow rate of the refrigerant after splitting is 2.75%, 2.15%, and 3.7%, respectively. In the first flow splitting assembly 37 without the pressure dividing flow channel structure 39, the non-uniformity of the flow rate of the refrigerant after splitting is 5.5%, 12.2%, and 16.1%, respectively. Thus, by providing the pressure dividing flow channel structure 39, the uniformity of refrigerant split by the first flow splitting assembly 37 can be improved, and the faster the flow velocity of the refrigerant, the better the effect of the first flow splitting assembly 37 on improving the uniformity of refrigerant splitting.

[0137] In the descriptions of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0138] It should be understood by those skilled in the art that the scope of the present application is not limited to the specific embodiments described above, and certain elements of the embodiments can be modified or replaced without departing from the spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An air conditioner, comprising: a housing; a four-way valve; and a heat exchanger assembly provided in the housing, the heat exchanger assembly comprising: a heat exchanger body configured to exchange heat with refrigerant; a flow splitting assembly configured to split the refrigerant to improve uniformity of the refrigerant flowing into the heat exchanger body; and a gas collecting tube extending along a first direction and in communication with the four-way valve, wherein the flow splitting assembly and the gas collecting tube are located on a same side of the heat exchanger body, and along a flow direction of the refrigerant, the flow splitting assembly and the gas collecting tube are respectively connected to opposite sides of the heat exchanger body; wherein the heat exchanger body comprises: a plurality of first flat tubes in communication with the gas collecting tube and arranged along the first direction, wherein the plurality of first flat tubes separately extend along a second direction, two of the plurality of first flat tubes are provided adjacent to two ends of the gas collecting tube along the first direction, and the second direction is perpendicular to the first direction; and a plurality of second flat tubes in communication with the flow splitting assembly and arranged along the first direction, the plurality of second flat tubes separately extending along the second direction; wherein between the two first flat tubes adjacent to the two ends of the gas collecting tube, every two second flat tubes and every two first flat tubes are arranged alternately and spaced apart along the first direction, so that ends of every two first flat tubes adjacent to the gas collecting tube are adjacent to each other, and ends of every two second flat tubes adjacent to the flow splitting assembly are adjacent to each other; the end of the first flat tube adjacent to the gas collecting tube is in communication with the gas collecting tube, another end of the first flat tube away from the gas collecting tube is connected to and in communication with another end of the second flat tube adjacent to the first flat tube away from the flow splitting assembly, and the end of the second flat tube adjacent to the flow splitting assembly is connected to and in communication with the flow splitting assembly.

2. The air conditioner according to claim 1, wherein the flow splitting assembly comprises a first flow splitting assembly, the first flow splitting assembly is of a laminated structure, and the first flow splitting assembly comprises: a first connecting plate provided with a first through hole; a second connecting plate comprising: a second connecting plate body; and two first flow guiding channels provided on the second connecting plate body, wherein ends of the two first flow guiding channels that are adjacent to each other are in communication with the first through hole; and a plurality of second flow guiding channels, wherein ends of the two first flow guiding channels away from the first through hole are in communication with two or more of the second flow guiding channels; and a third connecting plate provided with a plurality of first connecting holes spaced apart along the first direction, wherein the plurality of first connecting holes are connected to and in communication with the plurality of second flat tubes respectively, an end of the second flow guiding channel away from the first flow guiding channel that the second flow guiding channel is in communication with is in communication with one or more first connecting holes, and the first connecting plate, the second connecting plate, and the third connecting plate are arranged sequentially along a direction toward the heat exchanger body and stacked on each other.

3. The air conditioner according to claim 2, wherein the second connecting plate satisfies at least one of following conditions: the second connecting plate further comprises a first flow splitting portion provided between the ends of the two first flow guiding channels adjacent to the first through hole, and the first flow splitting portion is configured to split the refrigerant from the first through hole, so that the split refrigerant flows into the two first flow guiding channels, respectively; or the second connecting plate further comprises a second flow splitting portion corresponding to the first flow guiding channel, the second flow splitting portion is provided between two second flow guiding channels in communication with the corresponding first flow guiding channel, and the second flow splitting portion is configured to split the refrigerant from the corresponding first flow guiding channel, so that the split refrigerant flows into the two second flow guiding channels in communication with the corresponding first flow guiding channel.

4. The air conditioner according to claim 2 or 3, wherein the first flow splitting assembly further comprises a fourth connecting plate provided between the second connecting plate and the third connecting plate, and the fourth connecting plate comprises: a fourth connecting plate body; and a plurality of second connecting holes provided on the fourth connecting plate body and corresponding to the plurality of first connecting holes, wherein the first connecting holes are communicated with the corresponding second flow guiding channels through the corresponding second connecting holes.

5. The air conditioner according to claim 4, wherein the fourth connecting plate further comprises a plurality of first flow splitting channels corresponding to the plurality of second connecting holes, two first flow splitting channels are provided between two second connecting holes in communication with a same second flow guiding channel along the first direction, one end of each of the two first flow splitting channels is in communication with the corresponding second connecting hole, respectively, and other ends of the two first flow splitting channels away from the corresponding second connecting hole are adjacent to each other and are in communication with the corresponding second flow guiding channel.

6. The air conditioner according to claim 5, wherein the fourth connecting plate further comprises a plurality of second flow splitting channels corresponding to the plurality of second flow guiding channels; among the two first flow splitting channels in communication with the same second flow guiding channel, the second flow splitting channel is provided between and in communication with the two first flow splitting channels, an end of the second flow splitting channel in communication with other ends of the two first flow splitting channels that are adjacent to each other, another end of the second flow splitting channel extend along a third direction and are in communication with the second flow guiding channel, and the third direction is perpendicular to the first direction and the second direction.

7. The air conditioner according to claim 6, wherein the fourth connecting plate further comprises a plurality of third flow splitting portions provided corresponding to the plurality of second flow splitting channels, the third flow splitting portion is provided at an end of the corresponding second flow splitting channel adjacent to the corresponding two first flow splitting channels and is located between the corresponding two first flow splitting channels, and the third flow splitting portion is configured to partially separate the corresponding two first flow splitting channels to split the refrigerant flowing from the second flow splitting channel to the corresponding two first flow splitting channels.

8. The air conditioner according to claim 6 or 7, wherein the first flow splitting assembly further comprises a fifth connecting plate, the fifth connecting plate is provided between the second connecting plate and the fourth connecting plate, and the fifth connecting plate is configured to separate the first flow guiding channel from the second connecting holes, from the first flow splitting channels, and from the second flow splitting channels, and separate the second flow guiding channel from the second connecting holes, and from the first flow splitting channels; the fifth connecting plate is provided with a plurality of second through holes provided corresponding to the plurality of second flow guiding channels, and an end of the second flow splitting channel away from the corresponding first flow splitting channels is in communication with the corresponding second flow guiding channel through the second through hole.

9. The air conditioner according to any one of claims 2 to 8, wherein the two first flow guiding channels are of a symmetrical structure, the first flow guiding channel comprises: a first flow guiding portion; a second flow guiding portion in communication with the first flow guiding portion, wherein the first flow guiding portion is closer to the first through hole than the second flow guiding portion, the second flow guiding portion is of a linear structure, and the second flow guiding portion is configured to smoothly transport the refrigerant guided through the first flow guiding portion to reduce fluctuation of a flow rate of the refrigerant; and a plurality of bent portions each being of a curved tube structure with an arc right-angle, wherein the plurality of bent portions are configured to adjust a flow direction of the refrigerant, at least one of the bent portions is located between the first flow guiding portion and the second flow guiding portion to enable the first flow guiding portion to be in communication with the second flow guiding portion.

10. The air conditioner according to claim 9, where the second connecting plate further comprises two third flow guiding channels corresponding to the two first flow guiding channels, the third flow guiding channel is provided between the first flow guiding portion and the second flow guiding portion, the third flow guiding channel is in communication with the bent portion in communication with the second flow guiding portion, in the third direction, the second flow guiding portion is located between the third flow guiding channel and the bent portion, and the third flow guiding channel is configured to enable the refrigerant flowing in third flow guiding channel to form a vortex to improve uniformity of the refrigerant flowing into the second flow guiding portion, and the third direction is perpendicular to the first direction and the second direction.

11. The air conditioner according to claim 1, wherein the flow splitting assembly comprises a first flow splitting assembly, the first flow splitting assembly is of a laminated structure, and the first flow splitting assembly comprises: a first connecting plate provided with a first through hole; a second connecting plate comprising: a second connecting plate body; and two first flow guiding channels provided on the second connecting plate body, wherein ends of the two first flow guiding channels that are adjacent to each other are in communication with the first through hole; and a third connecting plate provided with a plurality of first connecting holes spaced apart along the first direction, wherein the plurality of first connecting holes are connected to and in communication with the plurality of second flat tubes respectively, and a fourth connecting plate comprising: a fourth connecting plate body; and a plurality of second connecting holes provided on the fourth connecting plate body and provided corresponding to the plurality of first connecting holes, wherein half of the plurality of second connecting holes are in communication with the first flow guiding channels, and another half of the plurality of second connecting holes are in communication with another first flow guiding channel, the first connecting holes are in communication with the corresponding first flow guiding channels through the corresponding second connecting holes, and the first connecting plate, the second connecting plate, the fourth connecting plate, and the third connecting plate are arranged sequentially along a direction toward the heat exchanger body and stacked on each other.

12. The air conditioner according to claim 11, wherein the fourth connecting plate further comprises a plurality of first preset holes, at least one of the plurality of first preset holes is provided between two second connecting holes corresponding to two adjacent second flat tubes, the two second connecting holes are in communication with each other through the at least one first preset hole, and the first preset hole is configured to adjust pressures of the refrigerant in the two adjacent second connecting holes.

13. The air conditioner according to claim 12, wherein the first flow splitting assembly further comprises: a sixth connecting plate provided with a plurality of third through holes, wherein the plurality of third through holes correspond to the two first flow guiding channels, the third through hole is adjacent to an end of the corresponding first flow guiding channel away from the first through hole; and a seventh connecting plate, wherein the sixth connecting plate and the seventh connecting plate are provided between the second connecting plate and the fourth connecting plate, and the sixth connecting plate is closer to the second connecting plate than the seventh connecting plate, the seventh connecting plate comprises: a seventh connecting plate body; two fourth flow guiding channels provided on the seventh connecting plate body, wherein the two fourth flow guiding channels are symmetrically distributed, and the two fourth flow guiding channels are in communication with the corresponding first flow guiding channel through the corresponding third through hole; a fourth flow splitting portion provided between the ends of the two fourth flow guiding channels adjacent to the corresponding third through hole and located on a side of the corresponding third through hole away from the second connecting plate, wherein the fourth flow splitting portion is configured to split the refrigerant flowing from the corresponding third through hole into the two fourth flow guiding channels; two fifth flow guiding channels provided on the seventh connecting plate body, wherein the two fifth flow guiding channels are symmetrically distributed, and the two fifth flow guiding channels are in communication with the corresponding first flow guiding channel through the corresponding third through hole; and a fifth flow splitting portion provided between the ends of the two fifth flow guiding channels adjacent to the corresponding third through hole and is located on a side of the corresponding third through hole away from the second connecting plate, the fifth flow splitting portion is configured to split the refrigerant flowing from the corresponding third through hole into the two fifth flow guiding channels; wherein the two second connecting holes connected to two adjacent second flat tubes serve as a group of second connecting holes, the fourth flow guiding channel is in communication with one group of or the plurality of second connecting holes, and the fifth flow guiding channel is in communication with one group of or the plurality of second connecting holes.

14. The air conditioner according to claim 13, wherein the seventh connecting plate further comprises a plurality of third connecting holes, the plurality of third connecting holes correspond to and are in communication with the plurality of second connecting holes, respectively; the fourth flow guiding channel is in communication with two third connecting holes, the two third connecting holes are adjacent to each other and are located at an end of the fourth flow guiding channel away from the fourth flow splitting portion, the fifth flow guiding channel is in communication with two third connecting holes, the two third connecting holes are adjacent to each other and are located at an end of the fifth flow guiding channel away from the fifth flow splitting portion, and the two adjacent third connecting holes correspond to a same group of second connecting holes.

15. The air conditioner according to claim 14, wherein the seventh connecting plate further comprises a plurality of second preset holes, one first preset hole corresponds to two second preset holes; the two adjacent third connecting holes in communication with the fourth flow guiding channel or the fifth flow guiding channel serve as a group of third connecting holes, and two adjacent second preset holes serve as a group of second preset holes, the group of second preset holes are provided between the corresponding group of third connecting holes, one second preset hole in the group of second preset holes is in communication with one third connecting hole, and another second preset hole in the group of second preset holes is in communication with another third connecting hole, the two second preset holes in the group of second preset holes are spaced apart and are located on a same side of the corresponding fourth flow guiding channel or fifth flow guiding channel, and ends of the two second preset holes in the group of second preset holes away from the corresponding third connecting holes are in communication with a same first preset hole.

16. The air conditioner according to claim 15, wherein the sixth connecting plate is further provided with a plurality of third preset holes, one third preset hole corresponds to two second preset holes, and ends of the two second preset holes in the group of second preset holes away from the corresponding third connecting holes are in communication with a same third preset hole.

17. The air conditioner according to any one of claims 11 to 16, wherein the second connecting plate further comprises a first flow splitting portion, the first flow splitting portion is provided between ends of the two first flow guiding channels adjacent to the first through hole, and the first flow splitting portion is configured to split the refrigerant from the first through hole, so that the split refrigerant flows into the two first flow guiding channels, respectively.

18. The air conditioner according to any one of claims 2 to 17, wherein the heat exchanger body further comprises: a plurality of third flat tubes arranged along the first direction, wherein the plurality of third flat tubes separately extend along the second direction, a number of the third flat tubes is the same as a number of the first flat tubes, the plurality of third flat tubes respectively corresponds to the plurality of the first flat tubes, two of the plurality of third flat tubes are provided adjacent to two ends of the gas collecting tube along the first direction and are located at a same height as the two first flat tubes adjacent to the two ends of the gas collecting tube; a plurality of fourth flat tubes arranged along the first direction, wherein the plurality of fourth flat tubes separately extend along the second direction, the number of the third flat tubes is a same as the number of the fourth flat tubes, between the two third flat tubes adjacent to the two ends of the gas collecting tube, every two fourth flat tubes and every two third flat tubes are alternately arranged and spaced apart along the first direction, so that each third flat tube is adjacent to the fourth flat tube; an end of the fourth flat tube adjacent to the gas collecting tube is connected to and in communication with the gas collecting tube, and another end of the fourth flat tube away from the gas collecting tube is connected to and in communication with one end of the third flat tube adjacent to the fourth flat tube away from the gas collecting tube; and a plurality of connecting tubes having a same number as that of the first flat tubes, wherein the end of the first flat tube adjacent to the gas collecting tube is connected to and in communication with another end of the corresponding third flat tube adjacent to the gas collecting tube through the connecting tube.

19. The air conditioner according to claim 18, further comprising a fan assembly provided in the housing and configured to drive air to flow through the heat exchanger assembly; wherein the heat exchanger body further comprises a plurality of fins, the plurality of fins separately extend along the first direction, each fin is provided with a plurality of slots spaced apart along the first direction, a side of the slot away from the fan assembly is open, and the plurality of slots are open toward a same side; at least one of the first flat tubes, the second flat tubes, the third flat tubes, or the fourth flat tubes is inserted into the corresponding slots and is in contact with and connected to the fin, the plurality of fins are spaced apart along at least one of the second direction or the third direction and are located on a windward side of at least one of the first flat tubes, the second flat tubes, the third flat tubes, or the fourth flat tubes, and the third direction is perpendicular to the first direction and the second direction.

20. The air conditioner according to any one of claims 2 to 19, further comprising a throttling device configured to adjust pressure of the refrigerant flowing through the heat exchanger assembly, wherein the flow splitting assembly further comprises a second flow splitting assembly, the second flow splitting assembly comprises: a main liquid tube, an end of the main liquid tube being connected to the throttling device; a flow splitting portion, another end of the main liquid tube being connected to an end of the flow splitting portion; and a plurality of branch tubes respectively connected to the first flow splitting assembly and another end of the flow splitting portion.

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