Fin assembly, micro-channel heat exchanger and heating and ventilation equipment

Abstract

The utility model provides a fin assembly, microchannel heat exchanger and heating and ventilation equipment, fin assembly comprises a plurality of fin units that are connected along a first direction in order, each fin unit comprises a windward part, a connecting part and a leeward part that are connected along a second direction in order, the second direction intersects with the first direction, a mounting space for mounting a heat exchange tube is formed between the two connecting parts of every two adjacent fin units, in the second direction, the length of the windward part is e1, the length of the leeward part is e2, and e1 is larger than e2. According to the fin assembly, the heat exchange pipe is installed through the connecting part, the windward part and the leeward part are arranged on the two sides of the connecting part, condensate water generated during heat exchange can be discharged through the windward part and the leeward part on the two sides, and the length of the windward part generated by condensate water with the high heat exchange capacity is larger than that of the leeward part generated by condensate water with the low heat exchange capacity. And the drainage performance of the condensed water gathering part is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a fin assembly, a microchannel heat exchanger and a heating and ventilation device. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Currently, the fins of microchannel heat exchangers in the industry are arranged in a serpentine manner between tubes and inserted on one side. The condensed water generated during the heat exchange process cannot be discharged, or can only flow down along the extended edge of one side of the fin, resulting in insufficient drainage rate and easy frost in low temperature conditions. Utility Model Content

[0004] The purpose of the utility model is to at least solve the technical problem that the fin drainage performance of the existing microchannel heat exchanger is poor. This purpose is achieved through the following technical solutions:

[0005] The first aspect of the utility model provides a fin assembly, wherein the fin assembly comprises a plurality of fin units connected in sequence along a first direction, wherein the fin unit comprises a windward portion, a connecting portion and a leeward portion connected in sequence along a second direction, wherein the second direction intersects with the first direction, and an installation space for installing a heat exchange tube is formed between two connecting portions of two adjacent fin units, and along the second direction, the length of the windward portion is e 1， The length of the leeward portion is e2, e1>e2.

[0006] The fin assembly proposed in the utility model installs the heat exchange tube through the connecting part, and the windward part and the leeward part are arranged on both sides of the connecting part. The condensed water generated during the heat exchange can be discharged through the windward part and the leeward part on both sides, and the length of the windward part with stronger heat exchange capacity and more condensed water is greater than that of the leeward part with weaker heat exchange capacity, thereby further improving the drainage performance of the part where the condensed water accumulates.

[0007] In addition, the fin assembly according to the utility model may also have the following additional technical features:

[0008] In some embodiments of the utility model, the connecting part includes a first connecting plate and a second connecting plate, the windward part includes a windward plate, and the leeward part includes a leeward plate, the first connecting plate, the windward plate, the second connecting plate and the leeward plate are arranged in the same plane, and the first connecting plate is abutted or spaced from the second connecting plate.

[0009] In some embodiments of the utility model, the two windward parts of two adjacent fin units are connected, the two leeward parts of two adjacent fin units are connected, a first slot is formed between the two first connecting plates of two adjacent fin units, and a second slot is formed between the two second connecting plates of two adjacent fin units, the first slot is connected to the second slot, and is used to install the same heat exchange tube.

[0010] In some embodiments of the present invention, 6 mm ≤ e1 ≤ 12 mm;

[0011] And / or, 0.2≤e2 / e1≤0.8.

[0012] In some embodiments of the present invention, along the second direction, the sum of the length of the first connecting plate and the length of the windward plate is L1, the sum of the length of the second connecting plate and the length of the leeward plate is L2, 0.3≤e1 / L1≤0.4, and / or, 0.3≤e2 / L2≤0.4.

[0013] In some embodiments of the present invention, at least one air guide port is provided on the connecting portion, and the air guide port is used to guide the airflow on one side of the fin unit along its own thickness direction to the other side.

[0014] In some embodiments of the utility model, the number of the air guide outlets is two, and one air guide outlet is respectively provided on the first connecting plate and the second connecting plate, and the air guiding direction of the air guide outlet located on the first connecting plate intersects with the air guiding direction of the air guide outlet located on the second connecting plate.

[0015] In some embodiments of the utility model, along the second direction, the total length of the fin unit is L, L=L1+L2, and the minimum distance from the air guide port to the end of the windward portion away from the connecting portion is e3, 0.3≤e3 / L≤0.5.

[0016] In some embodiments of the present invention, the air guide port has a plurality of air guide vanes spaced apart along the second direction, and the number of the air guide vanes is n, where 5≤n≤15.

[0017] In some embodiments of the present invention, the angle between the air guide plate and the second direction is α, 20°≤α≤35°.

[0018] In some embodiments of the present invention, the plurality of air guides are arranged in parallel, and the distance between two adjacent air guides along the second direction is p. f , the length of the air guide plate along the air guide direction of the air guide port is w, sinα≤p f / w≤3sinα.

[0019] In some embodiments of the present invention, along the first direction, the length of the installation space is t w , the distance between two adjacent installation spaces is p t The length of the air guide plate along the direction perpendicular to the first direction and the second direction is l, 0.5≤l / (p t -t w )<1.

[0020] In some embodiments of the utility model, at least one first reinforcing rib is provided on the windward portion;

[0021] And / or, at least one second reinforcing rib is provided on the leeward portion.

[0022] The second aspect of the utility model provides a microchannel heat exchanger, comprising:

[0023] Multiple heat exchange tubes;

[0024] a first header, one end of all the plurality of heat exchange tubes being in communication with the first header;

[0025] a second header, the other ends of all the plurality of heat exchange tubes being in communication with the second header;

[0026] In the fin assembly provided in the first aspect of the utility model, the plurality of heat exchange tubes correspond to the plurality of fin units one by one, and the heat exchange tubes are installed at the connecting portion.

[0027] The microchannel heat exchanger proposed in the second aspect of the utility model has the same beneficial effects as the fin assembly proposed in the first aspect of the utility model.

[0028] The third aspect of the utility model provides a HVAC device, including the microchannel heat exchanger provided in the second aspect of the utility model.

[0029] The HVAC equipment proposed in the third aspect of the utility model has the same beneficial effects as the microchannel heat exchanger proposed in the first aspect of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0031] Figure 1 The structure diagram of the fin assembly according to the embodiment of the utility model is schematically shown;

[0032] Figure 2 Schematically shows a structural diagram of a fin unit according to an embodiment of the utility model from a first viewing angle;

[0033] Figure 3 Schematically shows a structural schematic diagram of a fin unit according to an embodiment of the utility model from a second viewing angle;

[0034] Figure 4 Schematically shows Figure 3 A schematic diagram of the cross-sectional structure in the middle A direction;

[0035] Figure 5 The schematic diagram of the structure of the fin unit (with reinforcing ribs) according to the embodiment of the utility model is schematically shown;

[0036] Figure 6 The temperature distribution cloud diagram of the fin unit in operation according to the embodiment of the utility model is schematically shown;

[0037] Figure 7 The schematic diagram of the structure of the microchannel heat exchanger according to the embodiment of the utility model is schematically shown;

[0038] The symbols in the accompanying drawings are as follows:

[0039] 100, fin assembly; 101, fin unit; 102, heat exchange tube; 103, first header; 104, second header;

[0040] 10. Windward part; 11. Connecting part; 111. First connecting plate; 112. Second connecting plate; 12. Leeward part; 13. Installation space; 131. First slot; 132. Second slot;

[0041] 20. Air guide port; 21. Air guide vane;

[0042] 30. First reinforcing rib; 31. Second reinforcing rib. DETAILED DESCRIPTION

[0043] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0044] 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.

[0045] 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.

[0046] For ease of description, spatial relative terms may be used herein to describe the relationship 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", 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 is turned over, then the elements 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..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0047] like Figures 1 to 7 As shown, Figure 2A direction represents the second direction, and B direction represents the first direction. The first aspect of the utility model provides a fin assembly 100, which includes a plurality of fin units 101 connected in sequence along the first direction. The fin unit 101 includes a windward portion 10, a connecting portion 11 and a leeward portion 13 connected in sequence along the second direction. The second direction intersects with the first direction. An installation space 14 for installing a heat exchange tube 102 is formed between two connecting portions 11 of two adjacent fin units 101. Along the second direction, the length of the windward portion 10 is e 1， The length of the leeward portion 13 is e2, e1>e2.

[0048] It can be understood that the plurality of fin units 101 are arranged along the first direction so that an installation space 14 for installing the heat exchange tube 102 is formed between two adjacent fin units 101. The fin unit 101 can be a long plate structure and divided into a windward portion 10, a connecting portion 11 and a leeward portion 13 according to the function. The two adjacent fin units 101 can be integrally formed and connected, or welded. The second direction is the wind direction blowing toward the fin assembly 100 when the fin assembly 100 is working. The second direction can be perpendicular to the first direction, so that the extension direction of the fin unit 101 is perpendicular to the heat exchange tube 102. The windward portion 10 is the part on the windward side of the fin unit 101. The wind force of this part is relatively large, the heat exchange effect is relatively strong, and more condensed water is generated. It is necessary to set the length of the fin unit 101 extending from the heat exchange tube 102 to be relatively large, so that the condensed water can flow downward from the wider structure, reducing the phenomenon of insufficient drainage capacity due to the narrow flow path of the condensed water, so as to improve the drainage capacity. On the leeward side of the fin unit 101, the wind force is smaller, the heat exchange capacity is weaker, and less condensate is produced. Therefore, the length of the heat exchange tube 102 extending from the fin unit 101 needs to be designed to be smaller. Therefore, the length of the windward portion 10 along the second direction is designed to be greater than the length of the leeward portion 13, so that the windward portion 10 has a stronger drainage performance.

[0049] The fin assembly 100 proposed in the utility model is installed with a heat exchange tube 102 through a connecting portion 11, and a windward portion 10 and a leeward portion 13 are arranged on both sides of the connecting portion 11. Condensed water generated during heat exchange can be discharged through the windward portion 10 and the leeward portion 13 on both sides, and the length of the windward portion 10 with stronger heat exchange capacity and more condensed water generated is greater than that of the leeward portion 13 with weaker heat exchange capacity, thereby further improving the drainage performance of the part where condensed water accumulates.

[0050] In some embodiments of the utility model, the connecting portion 11 includes a first connecting plate 111 and a second connecting plate 112, the windward portion 10 includes a windward plate, the leeward portion 13 includes a leeward plate, the first connecting plate 111 is coplanar with the windward plate, the second connecting plate 112 is coplanar with the leeward plate, the first connecting plate 111 and the second connecting plate 112 are coplanar, and the first connecting plate 111 and the second connecting plate 112 are abutted or spaced apart.

[0051] It is understandable that the first connecting plate 111, the second connecting plate 112, the windward plate and the leeward plate can be rectangular plate structures, the first connecting plate 111 can be integrally formed with the windward plate, and the second connecting plate 112 can be integrally formed with the leeward plate, so that they have higher structural strength. Chamfers or rounded corners can be set at the end of the first connecting plate 111 away from the windward plate and the end of the second connecting plate 112 away from the leeward plate to facilitate plugging with the heat exchange tube 102 during assembly and reduce resistance.

[0052] In some embodiments of the utility model, the two windward parts 10 of two adjacent fin units 101 are connected, the two leeward parts 13 of two adjacent fin units 101 are connected, a first slot 141 is formed between the two first connecting plates 111 of the two adjacent fin units 101, and a second slot 142 is formed between the two second connecting plates 112 of the two adjacent fin units 101. The first slot 141 is connected to the second slot 142 and is used to install the same heat exchange tube 102.

[0053] It can be understood that the two windward parts 10 of two adjacent fin units 101 can be integrally formed or welded together, and the two leeward parts 13 of two adjacent fin units 101 can be integrally formed or welded together, so that the fin unit 101 is divided into two left and right parts, and the left and right parts of each fin unit 101 correspond to each other. The length of the first connecting plate 111 in the first direction can be smaller than the windward plate, so that a first slot 141 is formed between the two adjacent first connecting plates 111, and the length of the second connecting plate 112 in the first direction can be smaller than the leeward plate, so that a second slot 142 is formed between the two adjacent second connecting plates 112. From the overall point of view, the first slots 141 are arranged at intervals along the first direction, and the second slots 142 are arranged at intervals along the second direction, so that the left and right parts of the fin assembly 100 can be plugged and matched with the heat exchange tube 102 from both sides of the heat exchange tube 102, thereby realizing the fixed connection between the fin assembly 100 and the heat exchange tube 102.

[0054] In some embodiments of the present invention, 6 mm ≤ e1 ≤ 12 mm;

[0055] And / or, 0.2≤e2 / e1≤0.8.

[0056] It can be understood that the windward part 10 and the leeward part 13 of the fin unit 101 are extended sections beyond the heat exchange tube 102. The longer the extended section, the lower the heat transfer coefficient of the fin. Therefore, an asymmetric form is adopted. A short extension e2 is used at the position where the heat transfer capacity is weak on the leeward side of the fin unit 101. Conversely, a long extension e1 is used on the windward side of the fin unit 101, which is beneficial to improving the heat exchange efficiency.

[0057] In some embodiments of the present invention, along the second direction, the sum of the lengths of the windward portion 10 and the first connecting plate 111 is L1, the sum of the lengths of the leeward portion 13 and the second connecting plate 112 is L2, 0.3≤e1 / L1≤0.4, and / or, 0.3≤e2 / L2≤0.4.

[0058] It can be understood that in order to ensure the strength and installation reliability of the fin unit 101, the length of the windward part 10 and the leeward part 13 should not be too long, and in order to ensure the heat exchange efficiency and drainage rate, the length of the windward part 10 and the leeward part 13 should not be too short, and can be set to 0.3≤e1 / L1≤0.4, and / or, 0.3≤e2 / L2≤0.4, so as to comprehensively improve the structural strength and heat exchange and drainage efficiency.

[0059] In some embodiments of the present invention, at least one air guide port 20 is provided on the connecting portion 11 , and the air guide port 20 is used to guide the airflow on one side of the fin unit 101 along its thickness direction to the other side.

[0060] It is understandable that one or more air guide ports 20 may be provided on the connection portion 11 so that the airflow on one side of the fin unit 101 can flow to the other side through the air guide ports 20, thereby strengthening the airflow around the fin unit 101 and improving the heat exchange efficiency.

[0061] In some embodiments of the present invention, the number of air guide outlets 20 is two, and an air guide outlet 20 is respectively provided on the first connecting plate 111 and the second connecting plate 112, and the air guiding direction of the air guide outlet 20 located on the first connecting plate 111 intersects with the air guiding direction of the air guide outlet 20 located on the second connecting plate 112.

[0062] It can be understood that an air guide port 20 may be provided on the first connecting plate 111 and the second connecting plate 112 respectively, and the air guiding directions of the two air guide ports 20 are opposite, so that the airflow can flow from the air guide port 20 on the first connecting plate 111 to the other side, and then flow back to the original side from the air guide port 20 on the second connecting plate 112, so that the airflow can pass through the fin assembly 100 multiple times, thereby strengthening the airflow flow on both sides of the fin unit 101, thereby improving the heat exchange efficiency.

[0063] In some embodiments of the present invention, along the second direction, the total length of the fin unit 101 is L, where L=L1+L2. ， The minimum distance between the air guide port 20 and the end of the windward portion 10 away from the connecting portion 11 is e3, and 0.3≤e3 / L≤0.5.

[0064] It can be understood that, based on the analysis of the window position of the air vent 20 , setting the air vent 20 at the position of 0.3≤e3 / L≤0.5 makes the heat transfer coefficient and fin efficiency of the fin unit 101 higher, and has little effect on the pressure drop of the fin unit 101.

[0065] In some embodiments of the present invention, the air guide port 20 has a plurality of air guide blades 21 spaced apart along the second direction, and the number of the air guide blades 21 is n, where 5≤n≤15.

[0066] It is understandable that, based on the analysis of the number n of windows of the air guide 20, the more the number n of windows, the better the heat exchange performance, but the greater the pressure drop. Therefore, the comprehensive required number of windows is 5≤n≤15, taking into account all aspects of performance.

[0067] In some embodiments of the present invention, the angle between the air guide piece 21 and the second direction is α, 20°≤α≤35°.

[0068] It can be understood that, based on the analysis of the window opening angle α of the air guide port 20, the larger the window opening angle α, the better the heat exchange performance. However, when the window opening angle reaches the critical value α0, continuing to increase the angle will only have a small effect on the heat exchange performance, while the pressure drop increases rapidly, which is not conducive to the heat exchange efficiency. Therefore, choosing a window opening angle of 20°≤α≤35 is a better choice.

[0069] In some embodiments of the present invention, a plurality of air guide blades 21 are arranged in parallel, and the distance between two adjacent air guide blades 21 along the second direction is p. f , the length of the air guide piece 21 along the air guide direction of the air guide port 20 is w, sinα≤p f / w≤3sinα.

[0070] It is understandable that, according to the analysis of the window width w of the air guide 20, the larger the window width w, the better the heat exchange performance, but according to the fin spacing p f Considering that too large window width w leads to increased pressure drop, which is not conducive to heat exchange efficiency, the fin spacing p is f and window angle w, choose sinα≤p f / w≤3sinα.

[0071] In some embodiments of the present invention, the length of the installation space 14 along the first direction is t w , the distance between two adjacent installation spaces 14 is p t The length of the air guide plate 21 perpendicular to the first direction and the second direction is l, 0.5≤l / (p t -t w )<1.

[0072] It can be understood that according to the analysis of the window length l, l refers to l1 or l2. The longer the window length l, the better the heat exchange performance, but the greater the pressure drop, which is not conducive to the heat exchange efficiency. Therefore, it is necessary to combine the temperature distribution on the fin surface and reasonably change the window length to achieve the best window length that just destroys the temperature boundary.

[0073] In some embodiments of the present invention, at least one first reinforcing rib 30 is provided on the windward portion 10;

[0074] And / or, at least one second reinforcing rib 31 is disposed on the leeward portion 13 .

[0075] It is understandable that by providing a plurality of first reinforcing ribs 30 on the surface of the windward plate, the structural strength is improved, the deformation of the windward plate under wind force is prevented, and the durability is improved. Specifically, the first reinforcing ribs 30 can extend along the second direction, so that the windward plate has a stronger ability to withstand wind force perpendicular to itself. In addition, providing a plurality of second reinforcing ribs 31 on the surface of the leeward plate improves the structural strength, prevents the leeward plate from being deformed under wind force, and improves the durability. Specifically, the second reinforcing ribs 31 can extend along the second direction, so that the leeward plate has a stronger ability to withstand wind force perpendicular to itself.

[0076] The second aspect of the utility model provides a microchannel heat exchanger, comprising:

[0077] A plurality of heat exchange tubes 102;

[0078] A first header 103, one end of all the heat exchange tubes 102 is connected to the first header 103;

[0079] A second header 104, the other ends of all the heat exchange tubes 102 are in communication with the second header 104;

[0080] In the fin assembly 100 provided in the first aspect of the present invention, the plurality of heat exchange tubes 102 correspond to the plurality of fin units 101 one by one, and the heat exchange tubes 102 are installed at the connecting portion 11 .

[0081] The microchannel heat exchanger proposed in the second aspect of the utility model has the same beneficial effects as the fin assembly 100 proposed in the first aspect of the utility model. The refrigerant flows into the heat exchange tube 102 from the first header 103 for heat exchange, and then flows out of the microchannel heat exchanger from the second header 104. The fin assembly 100 increases the contact area between the heat exchange tube 102 and the outside, thereby improving the heat exchange efficiency. Specifically, the heat exchange tube 102 and the fin assembly 100 can be blown to cool the heat exchange tube 102 and the refrigerant inside to achieve heat exchange.

[0082] Figure 6: is a temperature distribution cloud diagram of the fin unit 101 when it is working. In the figure, the windward part 10 is darker in color and has a lower temperature. It can be seen that the temperature drops significantly after extending the windward part 10, and further it can be known that the drainage efficiency is improved.

[0083] The third aspect of the utility model provides a HVAC device, including the microchannel heat exchanger provided in the second aspect of the utility model.

[0084] The HVAC equipment proposed in the third aspect of the utility model has the same beneficial effects as the microchannel heat exchanger proposed in the first aspect of the utility model. The microchannel heat exchanger can be a heat exchanger in an indoor unit of an air conditioner, and the refrigerant is exchanged with heat by blowing air to the microchannel heat exchanger to generate cold air to achieve refrigeration.

[0085] The above are only preferred specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A fin assembly, characterized in that: The fin assembly includes a plurality of fin units connected in sequence along a first direction, and the fin unit includes a windward portion, a connecting portion, and a leeward portion connected in sequence along a second direction, the second direction intersects with the first direction, and an installation space for installing a heat exchange tube is formed between the two connecting portions of two adjacent fin units, and along the second direction, the length of the windward portion is e 1， The length of the leeward portion is e2, e1>e2.

2. The fin assembly according to claim 1, characterized in that: The connecting portion includes a first connecting plate and a second connecting plate, the windward portion includes a windward plate, and the leeward portion includes a leeward plate. The first connecting plate, the windward plate, the second connecting plate and the leeward plate are arranged on the same plane, and the first connecting plate is abutted against or spaced from the second connecting plate.

3. The fin assembly according to claim 2, characterized in that: The two windward parts of two adjacent fin units are connected, and the two leeward parts of two adjacent fin units are connected. The installation space includes a first slot and a second slot. The first slot is formed between the two first connecting plates of the two adjacent fin units, and the second slot is formed between the two second connecting plates of the two adjacent fin units. The first slot is connected to the second slot and is used to install the same heat exchange tube.

4. The fin assembly according to claim 1, characterized in that: 6mm≤e1≤12mm; And / or, 0.2≤e2 / e1≤0.

8.

5. The fin assembly according to claim 2, characterized in that: Along the second direction, the sum of the length of the first connecting plate and the length of the windward plate is L1, the sum of the length of the second connecting plate and the length of the leeward plate is L2, 0.3≤e1 / L1≤0.4, and / or, 0.3≤e2 / L2≤0.

4.

6. The fin assembly according to claim 5, characterized in that: The connecting portion is provided with at least one air guide port, and the air guide port is used to guide the airflow from one side of the fin unit along its thickness direction to the other side.

7. The fin assembly according to claim 6, characterized in that: There are two air guide ports, one of which is provided on the first connecting plate and the second connecting plate respectively, and the air guiding direction of the air guide ports on the first connecting plate intersects with the air guiding direction of the air guide ports on the second connecting plate.

8. The fin assembly according to claim 6, characterized in that: Along the second direction, the total length of the fin unit is L, L=L1+L2, and the minimum distance from the air guide port to the end of the windward portion away from the connecting portion is e3, 0.3≤e3 / L≤0.

5.

9. The fin assembly according to claim 7, characterized in that: The air guide port has a plurality of air guide vanes spaced apart along the second direction, and the number of the air guide vanes is n, where 5≤n≤15.

10. The fin assembly according to claim 9, characterized in that: The included angle between the air guide plate and the second direction is α, 20°≤α≤35°.

11. The fin assembly according to claim 10, characterized in that: The plurality of air guides are arranged in parallel, and the distance between two adjacent air guides along the second direction is p. f , the length of the air guide plate along the air guide direction of the air guide port is w, sinα≤p f / w≤3sinα.

12. The fin assembly according to claim 9, characterized in that: Along the first direction, the length of the installation space is t w , the distance between two adjacent installation spaces is p t , the length of the air guide along the third direction is l, the third direction is perpendicular to the first direction and the second direction, 0.5≤l / (p t -t w )<1.

13. The fin assembly according to any one of claims 1 to 12, characterized in that: At least one first reinforcing rib is provided on the windward portion; And / or, at least one second reinforcing rib is provided on the leeward portion.

14. A microchannel heat exchanger, characterized in that: include: Multiple heat exchange tubes; a first header, one end of all the plurality of heat exchange tubes being in communication with the first header; a second header, the other ends of all the plurality of heat exchange tubes being in communication with the second header; According to the fin assembly according to any one of claims 1 to 13, the plurality of heat exchange tubes correspond to the plurality of fin units one by one, and the heat exchange tubes are installed at the connecting portion.

15. A HVAC equipment, characterized in that: Comprising the microchannel heat exchanger according to claim 14.

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