Heat exchanger and air conditioning unit

Abstract

The utility model relates to a heat exchanger and an air conditioning unit, the heat exchanger comprises a heat exchange tube, a plurality of fins are arranged on the outer side of the heat exchange tube, and the fins are arrayed in the direction with the first direction as the row direction and the second direction as the column direction; the fins jointly define a plurality of first refrigerant flow channels extending in the first direction and a plurality of second refrigerant flow channels extending in the second direction, the first refrigerant flow channels communicate with the second refrigerant flow channels, and at least one slit channel is formed in the root of each fin. And the slit channel is communicated with the adjacent second refrigerant flow channel. According to the heat exchanger, the heat exchange area is increased through the first refrigerant flow channel and the second refrigerant flow channel, the number of gasification cores of the heat exchanger is increased through the arrangement of the slit channels, the turbulence degree of fluid flowing is greatly improved while the heat exchange area is increased, large-area bubble bottom liquid micro-layer evaporation can be formed, and the heat exchange efficiency is improved. And boiling heat transfer is further enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchangers, and in particular to a heat exchanger and an air conditioning unit. Background Art

[0002] As a traditional large-capacity evaporator, the horizontal tube full liquid evaporator is widely used in air conditioning refrigeration, heat pump heating, chemical industry and other fields due to its low cost and strong stability. When the evaporator is in operation, the liquid to be evaporated fills the shell side space outside the heat exchange tube (the liquid level is usually slightly higher than the highest point of the heat exchange tube row), and the heat released by the fluid in the tube is transferred to the liquid outside the tube through the tube wall and the fins, causing the liquid to change phase, and the gas generated by boiling heat exchange is discharged from the top of the heat exchanger.

[0003] Efficient heat transfer of heat exchange tubes is a necessary condition for the efficient operation of flooded evaporators. The enhanced heat exchange tubes generally used in the industry currently have spiral 2D fins inside the tubes and evaporation fins with porous structures outside the tubes. Since the outside of the tubes involves boiling phase change heat transfer, a bubble core (gasification core) needs to be generated on the heating surface during heat exchange. It grows by absorbing the heat of the surrounding liquid, stirring the surrounding liquid while detaching from the heating wall. This process repeats itself to maintain the efficient heat transfer properties of boiling. The heating wall needs to have a certain degree of superheat compared to the saturation temperature of the fluid in order for the fluid to cross the energy barrier to produce a gasification core. When the working fluid is a fluid with large surface energy such as water, the energy barrier will be more difficult to cross, which increases the superheat requirement for initial boiling. When the gas core cannot be effectively generated, the surface of the heat exchange tube can only carry out single-sided convection heat transfer, and its heat transfer efficiency is much lower than boiling heat transfer.

[0004] Therefore, a new type of heat exchange tube structure is urgently needed to improve its evaporation heat exchange capacity. Utility Model Content

[0005] The present application provides a heat exchanger to solve the problem of low heat exchange efficiency of a full liquid evaporator.

[0006] In a first aspect, the present application provides a heat exchanger, comprising a heat exchange tube, wherein a plurality of fins are provided on the outer side of the heat exchange tube, wherein the plurality of fins are arranged in an array with a first direction as a row and a second direction as a column, wherein the plurality of fins together define a plurality of first refrigerant flow channels extending along the first direction and a plurality of second refrigerant flow channels extending along the second direction, wherein the first refrigerant flow channels are connected to the second refrigerant flow channels, and at least one slit channel is provided at the root of the fin, wherein the slit channel is connected to an adjacent second refrigerant flow channel.

[0007] According to the heat exchanger of the present application, a plurality of first refrigerant flow channels and a plurality of second refrigerant flow channels are defined by utilizing a plurality of arrays of fins, and each second refrigerant flow channel is connected to all the first refrigerant flow channels or each first refrigerant flow channel is connected to all, that is, a plurality of first refrigerant flow channels and a plurality of second refrigerant flow channels are connected in a grid-like manner, thus doubling the heat exchange area and enhancing the turbulence velocity of the fluid flow, and according to the classical nucleation theory, the slit channel at the root of the fin has a stable vapor collection capability for refrigerants with different wettability and can form a stable vaporization core, and the provision of the slit channel increases the number of vaporization cores of the heat exchanger, and the increase in the number of vaporization cores while increasing the heat exchange area greatly enhances the turbulence of the fluid flow, can form a large area of ​​bubble bottom liquid microlayer evaporation, and further enhances boiling heat transfer.

[0008] According to the heat exchanger of the present application, the slit channel extends along the second direction, and at least one air-catching groove is provided at the tip of the fin.

[0009] According to the heat exchanger of the present application, the slit channel extends along the second direction, which can simplify the difficulty of positioning and processing the slit channel. At least one air capture groove is provided at the tip of the fin, and the air capture groove can be used to contain gas blocks called gasification cores, which will naturally grow into bubbles and detach under the heating of the surrounding hot fluid, thereby enhancing the frequency of bubble generation under low heat flux density, strengthening fluid disturbance, and further enhancing boiling heat transfer.

[0010] Optionally, the fin has a first wall surface and a second wall surface opposite to each other along the second direction, the air-catching groove penetrates the second wall surface and defines an air-catching port on the second wall surface, and the air-catching groove has a tip disposed opposite to the air-catching port.

[0011] According to the heat exchanger of the present application, when the refrigerant flows through the slit channel, a vaporization core will be generated. The vaporization core flows through the air catcher port during the rising process and enters the air catcher groove through the air catcher port to form a vaporization core. The bubble core formed in the slit channel grows into a bubble and rolls when it separates from the fin, forming a disturbance. There is no need to wait for the slit channel to form a new vaporization core. The vaporization core formed in the air catcher groove grows into a bubble and rolls when it separates from the fin. This enhances the frequency of bubble generation in the heat exchanger at low heat flux density and strengthens the fluid disturbance. The air catcher groove has a tip arranged opposite to the air catcher port, which can facilitate the vaporization core to flow through the air catcher port during the rising process of producing bubbles, so that part of the gas can be retained in the air catcher groove as a new vaporization core. That is to say, the air catcher groove has a tip arranged opposite to the air catcher port, which can facilitate the retention of gas to form a new vaporization core, thereby further enhancing the density of the vaporization core, thereby improving the boiling heat exchange efficiency.

[0012] Optionally, the air-catching groove is formed into a pyramidal structure, and a cross-sectional shape of the air-catching groove perpendicular to the first direction is V-shaped and opens toward the second wall surface.

[0013] According to the heat exchanger of the present application, the gas capture groove is formed into a pyramidal structure, and the cross-sectional shape of the gas capture groove perpendicular to the first direction is V-shaped and opens toward the second wall surface. This is beneficial for trapping the gas to form a gasification core, and it is also convenient for the gasification core to escape from the gas capture port and generate bubbles.

[0014] Optionally, the first wall surface and the second wall surface gradually approach each other in the direction from the root of the fin toward the tip of the fin, the inner angle formed by the first wall surface and the plane where the root of the fin is located is a first inner angle, the outer angle formed by the second wall surface and the plane where the root of the fin is located is a second outer angle, and the second outer angle is greater than the first inner angle.

[0015] According to the heat exchanger of the present application, such a configuration enables the bubbles formed by the vaporization core generated through the slit channel to have a greater force on the second wall during the rising process, which is beneficial to improving the gas capture effect of the gas capture groove and enhancing the ability of the vaporization core to generate.

[0016] Optionally, the first inner angle is an acute angle, and the second outer angle is a right angle.

[0017] According to the heat exchanger of the present application, the larger the first outer angle is, the smaller the resistance of the first outer wall to the bubbles is when the bubbles grow, and the easier it is for the bubbles to detach from the fins, thereby increasing the frequency of bubble detachment and improving boiling heat transfer efficiency.

[0018] According to the heat exchanger of the present application, the fin is a regular trapezoid; and / or the air-catching groove defines a avoidance opening on the tip end surface of the fin, and the avoidance opening is connected to the air-catching opening.

[0019] According to the heat exchanger of the present application, while increasing the heat exchange area, the length of the slit channel can be guaranteed, which is more conducive to the generation of the gasification core. At the same time, while meeting the above functional requirements, the structure can also be simplified, which is convenient for layout and is conducive to setting a larger number of fins in a limited space, thereby improving the heat exchange efficiency of the heat exchanger.

[0020] According to the heat exchanger of the present application, the cross-section of the slit channel perpendicular to the second direction is in an arc shape.

[0021] According to the heat exchanger of the present application, the cross-sectional shape of the slit channel perpendicular to the second direction is arc-shaped, which is conducive to processing and manufacturing, improves the yield rate of the heat exchanger, and further achieves the purpose of reducing production costs.

[0022] According to the heat exchanger of the present application, a plurality of sequentially arranged inner tube teeth are provided in the heat exchange tube.

[0023] According to the heat exchanger of the present application, a plurality of inner tube teeth arranged in sequence along the second direction are provided in the heat exchange tube, so that the inner tube teeth can be utilized to fully exchange heat with the working medium in the heat exchange tube, thereby transferring heat to the surface of the heat exchange tube and the fin, thereby improving the heat exchange efficiency.

[0024] In a second aspect, the present application provides an air-conditioning unit, comprising the above-mentioned heat exchanger.

[0025] According to the air-conditioning unit of the present application, a plurality of first refrigerant flow channels and a plurality of second refrigerant flow channels are defined by using a plurality of arrays of fins, and each second refrigerant flow channel is connected to all the first refrigerant flow channels or each first refrigerant flow channel is connected to all, that is, a plurality of first refrigerant flow channels and a plurality of second refrigerant flow channels are connected in a grid-like manner, thus doubling the heat exchange area and enhancing the turbulence velocity of the fluid flow, and according to the classical nucleation theory, the slit channel at the root of the fin has a stable vapor collection capacity for refrigerants with different wettability and can form a stable vaporization core, and the provision of the slit channel increases the number of vaporization cores of the heat exchanger, and the increase in the number of vaporization cores while increasing the heat exchange area greatly enhances the turbulence of the fluid flow, and can form a large area of ​​bubble bottom liquid microlayer evaporation, further enhancing the boiling heat transfer of the heat exchanger, thereby improving the heat exchange capacity of the air-conditioning unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0029] Figure 1 A three-dimensional diagram of a heat exchanger provided in an embodiment of the present application;

[0030] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0031] Figure 3 A sectional perspective view of a heat exchanger provided in an embodiment of the present application;

[0032] Figure 4 A sectional side view of a heat exchanger provided in an embodiment of the present application;

[0033] Figure 5 A front view of a fin of a heat exchanger provided in an embodiment of the present application;

[0034] Figure 6 A top view of the fins of a heat exchanger provided in an embodiment of the present application.

[0035] Description of reference numerals:

[0036] Heat exchange tube 10, fin 20, slit channel 21, air capture groove 22, avoidance port 221, first wall surface 23, second wall surface 24, first inner angle ɑ, second outer angle β, inner tube teeth 30,

[0037] Bubble 2. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0040] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0041] like Figure 1 and Figure 2 As shown, the heat exchanger according to the embodiment of the present application includes a heat exchange tube 10, and a plurality of fins 20 are provided on the outer side of the heat exchange tube 10. The plurality of fins 20 are arranged in an array with the first direction as the row direction and the second direction as the column direction. The plurality of fins 20 jointly define a plurality of first refrigerant flow channels extending along the first direction and a plurality of second refrigerant flow channels extending along the second direction. The first refrigerant flow channels are connected to the second refrigerant flow channels. At least one slit channel 21 is provided at the root of the fin 20, and the slit channel 21 is connected to the adjacent second refrigerant flow channel.

[0042] Specifically, a plurality of arrays of fins 20 define a plurality of first refrigerant flow channels and a plurality of second refrigerant flow channels, each second refrigerant flow channel is connected to all the first refrigerant flow channels or each first refrigerant flow channel is connected to all, that is, a plurality of first refrigerant flow channels and a plurality of second refrigerant flow channels are connected in a grid-like manner, thereby doubling the heat exchange area and enhancing the turbulence velocity of the fluid flow. The slit channel 21 at the root of the fin 20 has a stable vapor collection capability for refrigerants with different wettability according to the classical nucleation theory, and can form a stable vaporization core. The provision of the slit channel 21 increases the number of vaporization cores of the heat exchanger. The slit channel 21 is connected to the second refrigerant flow channel. Since the space of the second refrigerant flow channel is much larger than the space of the slit channel 21, the vaporization core can generate bubbles 2 in the space of the second refrigerant flow channel, and the difficulty of detaching the bubbles 2 is reduced.

[0043] It is understandable that the number of the slit channels 21 can be one or more, and the multiple slit channels 21 are arranged at intervals along the first direction. In a specific embodiment, the number of the slit channels 21 is 2, 3, 4, etc. Here, the number of the slit channels 21 refers to the number of the slit channels 21 on a single fin 20.

[0044] In addition, the cross-sectional shape of the slit channel 21 perpendicular to the second direction is arc-shaped, rectangular, triangular, polygonal, etc., which is not limited in the present application.

[0045] According to the heat exchanger of the embodiment of the present application, the heat exchange area is increased while the number of vaporization cores is increased, which greatly enhances the turbulence of the fluid flow, can form a large area of ​​bubble bottom liquid microlayer evaporation, and further enhances boiling heat transfer.

[0046] like Figure 3 and Figure 4 As shown, according to the heat exchanger of the embodiment of the present application, the slit channel 21 extends along the second direction, and at least one air-catching groove 22 is provided at the tip of the fin 20 .

[0047] Specifically, the slit channel 21 extends along the second direction, which can simplify the difficulty of positioning and processing the slit channel 21. The tip of the fin 20 is provided with at least one air-catching groove 22, which can utilize the air-catching groove 22 to contain gas blocks called gasification cores, which will naturally grow into bubbles 2 and detach under the heating of the surrounding hot fluid, thereby enhancing the frequency of bubble 2 generation under low heat flux density.

[0048] The number of the slit channels 21 is one or more. When the number of the slit channels 21 is more than one, the multiple slit channels 21 are arranged along the first direction.

[0049] In addition, the fin 20 has a first wall 23 and a second wall 24 relative to each other along the second direction. The air capture groove 22 may be provided on the first wall 23 or on the second wall 24; or both the first wall 23 and the second wall 24 may be provided with the air capture groove 22.

[0050] When the first wall surface 23 is provided with air-catching grooves 22 , the number of the air-catching grooves 22 is one or more. When the second wall surface 24 is provided with air-catching grooves 22 , the number of the air-catching grooves 22 is one or more.

[0051] The heat exchanger according to the embodiment of the present application can enhance the frequency of bubble 2 generation under low heat flux density, strengthen fluid disturbance, and thus further enhance boiling heat transfer.

[0052] like Figure 3 and Figure 4As shown, in some embodiments, the fin 20 has a first wall 23 and a second wall 24 opposite to each other along the second direction, the air capture groove 22 penetrates the second wall 24 and defines an air capture port on the second wall 24, and the air capture groove 22 has a tip arranged opposite to the air capture port.

[0053] Specifically, when the refrigerant flows through the slit channel 21, a vaporization core is generated. The vaporization core flows through the air catcher port during the rising process, and enters the air catcher groove 22 through the air catcher port to form a vaporization core. The bubble 2 core formed in the slit channel 21 grows into the bubble 2 and rolls when it separates from the fin 20, forming a disturbance. There is no need to wait for the slit channel 21 to form a new vaporization core. The vaporization core formed in the air catcher groove 22 grows into the bubble 2 and rolls when it separates from the fin 20. This enhances the frequency of bubble 2 generation in the heat exchanger under low heat flux density and strengthens the fluid disturbance. The air catcher groove 22 has a tip arranged opposite to the air catcher port, which can facilitate the vaporization core to flow through the air catcher port during the rising process of the production bubble 2 so that part of the gas can be retained in the air catcher groove 22 as a new vaporization core.

[0054] In the direction from the tip to the air-catching port, the side wall of the air-catching groove 22 can be a straight side wall or a curved side wall, which is not limited in the present application.

[0055] According to the heat exchanger of the embodiment of the present application, the gas capture groove 22 has a tip arranged opposite to the gas capture port, which can facilitate the capture of gas to form a new gasification core, thereby further enhancing the gasification core density, thereby improving the boiling heat exchange efficiency.

[0056] like Figure 3 and Figure 5 As shown, in some embodiments, the air-catching groove 22 is formed into a pyramidal structure, and the cross-section of the air-catching groove 22 perpendicular to the first direction is in a V-shape opening toward the second wall surface 24 .

[0057] According to the heat exchanger of the embodiment of the present application, the air capture groove 22 is formed into a pyramidal structure, and the cross-sectional shape of the air capture groove 22 perpendicular to the first direction is a V-shape opening toward the second wall 24. This is beneficial for trapping the gas to form a vaporization core, while also facilitating the vaporization core to escape from the air capture port and generate bubbles 2, thereby accelerating the generation rate of the bubbles 2, thereby improving the boiling heat transfer efficiency of the heat exchanger.

[0058] like Figure 3 , Figure 4 as well as Figure 6 As shown, in some embodiments, the first wall 23 and the second wall 24 gradually approach each other in the direction from the root of the fin 20 toward the tip of the fin 20, the inner angle formed by the first wall 23 and the plane where the root of the fin 20 is located is the first inner angle ɑ, the outer angle formed by the second wall 24 and the plane where the root of the fin 20 is located is the second outer angle β, and the second outer angle β is greater than the first inner angle ɑ.

[0059] After the core of the bubble 2 escapes from the slit channel 21, it contacts the first wall 23 of one of the two adjacent fins 20 in the same row and the second wall 24 of the other fin 20, and the second outer angle β is greater than the first inner angle ɑ, so that the inclination rate of the second wall 24 is less than the inclination rate of the first wall 23. The larger the inclination rate, the smaller the resistance between the bubble 2 and the second wall 24. In this way, the resistance between the bubble 2 and the second wall 24 is greater than the resistance between the bubble 2 and the first wall 23, which is beneficial to improving the gas capture effect of the gas capture groove 22; and the first wall 23 and the second wall 24 gradually approach each other in the direction from the root of the fin 20 toward the tip of the fin 20, so that in the process of the bubble 2 gradually rising, the distance between the first wall 23 of one fin 20 and the second wall 24 of the other adjacent fin 20 in the same row gradually increases, so that the resistance coefficient of the rising bubble 2 can be reduced, the escape speed of the bubble 2 can be accelerated, and the boiling heat exchange efficiency of the heat exchanger can be improved.

[0060] According to the heat exchanger of the embodiment of the present application, the arrangement is such that the bubbles 2 formed by the vaporization core generated through the slit channel 21 reduce the rising resistance between the first wall 23 and the second wall 24 during the rising process, and at the same time, the force between the bubbles and the second wall 24 is greater, which is beneficial to improving the gas capture effect of the gas capture groove 22 and enhancing the ability of the vaporization core to generate.

[0061] like Figure 4 As shown, in some embodiments, the first inner angle α is an acute angle, and the second outer angle β is a right angle.

[0062] In detail, when the bubble 2 moves and rises in the fluid, the fluid will exert an obstructive effect, causing the bubble 2 to deform, and the deformation of the bubble 2 will affect the resistance it encounters, thereby affecting the rising speed of the bubble 2. When the bubble 2 is deformed less, its rising rate is greater. Therefore, setting the second outer angle β to a right angle can minimize the influence of the second wall 24 on the deformation of the bubble 2 as much as possible.

[0063] like Figure 5 and Figure 6 As shown, in the heat exchanger according to the embodiment of the present application, the fin 20 is a regular trapezoidal body.

[0064] According to the heat exchanger of the embodiment of the present application, while increasing the heat exchange area, the length of the slit channel 21 can be guaranteed, which is more conducive to the generation of the gasification core. At the same time, while meeting the above functional requirements, the structure can also be simplified, which is convenient for layout, and is conducive to setting a larger number of fins 20 in a limited space, thereby improving the heat exchange efficiency of the heat exchanger.

[0065] like Figure 6As shown, according to the heat exchanger of the embodiment of the present application, the air-catching groove 22 defines a avoidance opening 221 at the tip end surface of the fin 20, and the avoidance opening 221 is connected to the air-catching opening. In this way, when the gasification core escapes from the air-catching groove 22, the avoidance opening 221 can avoid the gasification core, thereby reducing the difficulty of the gasification core escaping.

[0066] According to the heat exchanger of the embodiment of the present application, the cross-section of the slit channel 21 perpendicular to the second direction is arc-shaped.

[0067] According to the heat exchanger of the embodiment of the present application, the cross-section of the slit channel 21 perpendicular to the second direction is arc-shaped, which is conducive to processing and manufacturing, improves the yield rate of the heat exchanger, and further reduces the production cost.

[0068] like Figure 3 and Figure 4 As shown, according to the heat exchanger of the embodiment of the present application, a plurality of sequentially arranged inner tube teeth 30 are provided in the heat exchange tube 10 .

[0069] According to the heat exchanger of the embodiment of the present application, a plurality of inner tube teeth 30 arranged in sequence are provided in the heat exchange tube 10, so that the inner tube teeth 30 can be utilized to fully exchange heat with the working medium in the heat exchange tube 10, thereby transferring heat to the surface of the heat exchange tube 10 and the fin 20, thereby improving the heat exchange efficiency.

[0070] An air conditioning unit according to an embodiment of the present application includes the above-mentioned heat exchanger.

[0071] According to the air-conditioning unit of the present application, a plurality of arrays of fins 20 are used to define a plurality of first refrigerant flow channels and a plurality of second refrigerant flow channels, and each second refrigerant flow channel is connected to all the first refrigerant flow channels or each first refrigerant flow channel is connected to all, that is, a plurality of first refrigerant flow channels and a plurality of second refrigerant flow channels are connected in a grid-like manner, so that the heat exchange area is multiplied and the turbulence velocity of the fluid flow is enhanced. The slit channel 21 at the root of the fin 20 has a stable vapor collection capacity for refrigerants with different wettability according to the classical nucleation theory and can form a stable vaporization core, and the provision of the slit channel 21 increases the number of vaporization cores of the heat exchanger. The increase in the number of vaporization cores while increasing the heat exchange area greatly enhances the turbulence of the fluid flow and can form a large area of ​​bubble bottom liquid microlayer evaporation, further enhancing the boiling heat transfer of the heat exchanger, thereby improving the heat exchange capacity of the air-conditioning unit.

[0072] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0073] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0074] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A heat exchanger, characterized in that: It includes a heat exchange tube, and a plurality of fins are provided on the outer side of the heat exchange tube. The plurality of fins are arranged in an array with a first direction as a row and a second direction as a column. The plurality of fins together define a plurality of first refrigerant flow channels extending along the first direction and a plurality of second refrigerant flow channels extending along the second direction. The first refrigerant flow channels are connected to the second refrigerant flow channels. At least one slit channel is provided at the root of the fin, and the slit channel is connected to the adjacent second refrigerant flow channel.

2. The heat exchanger according to claim 1, characterized in that: The slit channel extends along the second direction, and the tip of the fin is provided with at least one air-catching groove.

3. The heat exchanger according to claim 2, characterized in that: The fin has a first wall surface and a second wall surface opposite to each other along the second direction, the air-catching groove penetrates through the second wall surface and defines an air-catching port on the second wall surface, and the air-catching groove has a tip disposed opposite to the air-catching port.

4. The heat exchanger according to claim 3, characterized in that The air-catching groove is formed in a pyramidal structure, and a cross-section of the air-catching groove perpendicular to the first direction is in a V-shape opening toward the second wall surface.

5. The heat exchanger according to claim 3 or 4, characterized in that: The first wall surface and the second wall surface gradually approach each other in the direction from the root of the fin toward the tip of the fin, the inner angle formed by the first wall surface and the plane where the root of the fin is located is a first inner angle, the outer angle formed by the second wall surface and the plane where the root of the fin is located is a second outer angle, and the second outer angle is greater than the first inner angle.

6. The heat exchanger according to claim 5, characterized in that The first inner angle is an acute angle, and the second outer angle is a right angle.

7. The heat exchanger according to claim 3 or 4, characterized in that: The fin is a regular trapezoid; and / or the air-catching groove defines a avoidance opening on the tip end surface of the fin, and the avoidance opening is connected to the air-catching opening.

8. The heat exchanger according to any one of claims 1 to 4, characterized in that: A cross-section of the slit channel perpendicular to the second direction is in an arc shape.

9. The heat exchanger according to any one of claims 1 to 4, characterized in that: A plurality of sequentially arranged inner tube teeth are arranged in the heat exchange tube.

10. An air conditioning unit, characterized in that: Comprising the heat exchanger according to any one of claims 1 to 9.

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