Heat exchanger and air conditioner

Abstract

The application discloses a heat exchanger and an air conditioner. The heat exchanger comprises a tube-fin assembly and a flow collecting structure arranged at both ends of the tube-fin assembly. The tube-fin assembly comprises a plurality of tube-fin units arranged at intervals along a first direction. An air duct is formed between two adjacent tube-fin units. The heat exchanger further comprises a fixed pitch module. The fixed pitch module is arranged at least on one side of the tube-fin assembly. The fixed pitch module is provided with a plurality of convex bodies. The convex bodies are inserted into the air duct to limit the distance between the adjacent tube-fin units. The air conditioner comprises the heat exchanger. The technical scheme provided by the application aims to solve the technical problem of the decline of heat exchange capacity caused by the uneven pitch of the heat exchanger.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrical equipment, in particular to a heat exchanger and air conditioner. BACKGROUND

[0002] At present, the heat exchanger mainly used in air conditioning refrigeration equipment is copper tube finned tube heat exchanger and micro-channel heat exchanger, and there is also a tube fin integrated heat exchanger, which has a tube fin monomer, the fin and the refrigerant channel of which are integrally formed by direct extrusion in production. During the production of the heat exchanger, the distance between the tube fin monomers may change, which will lead to a decrease in heat exchange capacity. Moreover, under the action of the fan, the tube fin monomers may also sway, resulting in leakage at the connection between the tube fin monomers and the header pipe and reducing the reliability of the heat exchanger. SUMMARY

[0003] The main purpose of the present application is to provide a heat exchanger and air conditioner, which aims to solve the technical problem of the decrease in heat exchange capacity caused by the uneven fin pitch of the heat exchanger produced at present.

[0004] To achieve the above-mentioned purpose, the heat exchanger provided by the present application comprises a tube fin assembly and a header structure arranged at both ends of the tube fin assembly, the tube fin assembly comprises a plurality of tube fin monomers arranged at intervals along a first direction, a wind channel is formed between two adjacent tube fin monomers, and the heat exchanger further comprises a fin pitch setting module, the fin pitch setting module is arranged at least on one side of the tube fin assembly, the fin pitch setting module is provided with a plurality of convex bodies, the convex bodies are inserted into the wind channel to define the distance between the adjacent tube fin monomers.

[0005] Further, the fin pitch setting module is provided with one; or the fin pitch setting module is provided with a plurality of fin pitch setting modules, the plurality of fin pitch setting modules are arranged respectively on opposite sides of the tube fin assembly, and the fin pitch setting modules on the two sides are arranged in alignment or staggered.

[0006] Further, the fin pitch setting module comprises a base body, the base body extends from one end to the other end of the tube fin assembly in the first direction, and the convex bodies are arranged on the base body.

[0007] Further, the base body extends along the first direction or is arranged inclined to the tube fin monomers, and a plurality of convex bodies are arranged at intervals along the length direction of the base body.

[0008] Further, the base body comprises a middle plate and two connecting plates arranged at both ends of the middle plate, the middle plate and the two connecting plates form a U shape, the convex bodies are arranged on the middle plate, and the two connecting plates are arranged respectively at both ends in the first direction of the tube fin assembly.

[0009] Further, the connecting plate extends to the other side of the tube-fin assembly away from the intermediate plate, and the connecting plate comprises a hook arranged at the end away from the intermediate plate, and the hook is connected to the side of the tube-fin assembly away from the intermediate plate.

[0010] Further, the number of the fixed-pitch modules is multiple, and the multiple fixed-pitch modules comprise a first module and a second module, the first module and the second module are arranged at opposite sides of the tube-fin assembly respectively, and the connecting plate of the first module and the connecting plate of the second module are connected correspondingly.

[0011] Further, one of the connecting plates in the first module is provided with a boss, and the other connecting plate is provided with a through hole; one of the connecting plates in the second module is provided with a boss, and the other connecting plate is provided with a through hole; the boss of the first module is inserted into the through hole of the second module correspondingly; and the boss of the second module is inserted into the through hole of the first module correspondingly.

[0012] Further, the length of the convex body in the first direction is equal to the width of the air duct.

[0013] Further, the tube-fin monomer comprises a fin part and a flow channel part, the fin part and the flow channel part are integrally formed and are arranged alternately along a second direction; two ends of the tube-fin monomer along the second direction are provided with two fin parts with a width of M, and the convex body extends along the second direction and the extension length is L, and L is less than M.

[0014] Further, the free end of the convex body is provided with a rounded corner at a corner.

[0015] Further, the tube-fin assembly is provided with a positioning module, and the positioning module is used to limit the fixed-pitch module.

[0016] Further, the tube-fin assembly further comprises two side plates, the two side plates are respectively arranged at two ends of the tube-fin assembly along a first direction and are arranged in parallel and spaced apart from the tube-fin monomer, and two ends of the side plate are inserted into the two current collecting structures respectively.

[0017] The application further provides an air conditioner comprising the heat exchanger.

[0018] In the technical scheme of the application, in the case that the heat exchange capacity is reduced due to uneven pitch, the heat exchanger of the embodiment of the application limits the gap between the tube-fin monomers through the fixed-pitch module, plays a supporting role, ensures that the distances between the tube-fin monomers are equal, the windward surface of the heat exchanger is uniformly subjected to wind, and the heat exchange capacity is not reduced. Moreover, under the support of the fixed-pitch module, even under the influence of the fan, the tube-fin monomers will not shake and will not produce abnormal sound, and it is ensured that the connection between the tube-fin monomers and the current collecting structure will not leak due to shaking. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0020] Figure 1 The schematic diagram of the heat exchanger in an embodiment of the present application is shown in FIG. 1.

[0021] Figure 2 The schematic diagram of the tube-fin monomer in FIG. 1 is shown in FIG. 2. Figure 1

[0022] Figure 3 The fitting schematic diagram of the tube-fin monomer in FIG. 1 is shown in FIG. 3. Figure 1

[0023] Figure 4 The first schematic diagram of the fixed-pitch module in FIG. 1 is shown in FIG. 4. Figure 1

[0024] Figure 5 The schematic diagram of the current collecting structure in FIG. 1 is shown in FIG. 5. Figure 1

[0025] Figure 6 The assembly schematic diagram of the current collecting structure and the side plate in FIG. 1 is shown in FIG. 6. Figure 1

[0026] Figure 7 The local enlarged schematic diagram of A in FIG. 1 is shown in FIG. 7. Figure 1

[0027] Figure 8 The second schematic diagram of the fixed-pitch module in FIG. 1 is shown in FIG. 8. Figure 1

[0028] Figure 9 The schematic diagram of the heat exchanger in another embodiment of the present application is shown in FIG. 9.

[0029] Figure 10 The schematic diagram of the fixed-pitch module in FIG. 9 is shown in FIG. 10. Figure 9

[0030] Figure 11 The local enlarged schematic diagram of B in FIG. 9 is shown in FIG. 11. Figure 9

[0031] The schematic diagram of the heat exchanger in another embodiment of the present application is shown in FIG. 12. Figure 12

[0032] The schematic diagram of the fixed-pitch module in FIG. 12 is shown in FIG. 13. Figure 13 Figure 12 The schematic diagram of the fixed-pitch module in FIG. 12 is shown in FIG. 13.​​​​​​​​​

[0033] Figure 14 Fig. 1 is a schematic view of a heat exchanger according to the present application; Figure 12 Fig. 2 is a schematic view of a heat exchanger according to the present application;

[0034] Figure 15 Fig. 3 is a schematic view of a heat exchanger according to the present application;

[0035] Brief Description of the Drawings

[0036] 100-tube fin assembly, 101-tube fin unit, 102-fin part, 103-flow channel part, 104-fluid passage, 105-side plate, 200-flow collecting structure, 201-base plate, 202-inlet and outlet, 203-first slot, 204-second slot, 300-pitch fixing module, 301-protruding body, 302-base body, 303-intermediate plate, 304-connecting plate, 305-groove, 306-protruding boss, 307-through hole, 308-slip hook, 309-first plate segment, 310-second plate segment, 311-round corner, 312-first module, 313-second module, 400-air duct, 500-positioning module, 501-positioning plate.

[0037] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without any creative work fall within the protection scope of the present application.

[0039] Reference will be made to Figures 1 to 7The heat exchanger of the embodiment of the present application comprises a tube-fin assembly 100 and a flow collecting structure 200, and two flow collecting structures 200 are arranged at two ends of the tube-fin assembly 100. Specifically, the tube-fin assembly 100 further comprises a plurality of tube-fin units 101, and the plurality of tube-fin units 101 are arranged at equal intervals along a first direction, so that the gap between two tube-fin units 101 forms an air duct 400, so that the air passes through the tube-fin assembly 100 to complete heat exchange. In particular, the heat exchanger further has a fixed pitch module 300, which is installed on one side of the tube-fin assembly 100, and the fixed pitch module 300 has a plurality of convex bodies 301, which are inserted into and support the air duct 400. Thus, the heat exchanger defines the gap between the tube-fin units 101 by the fixed pitch module 300, which plays a supporting role, ensures that the spacing between the tube-fin units 101 is equal, the windward surface of the heat exchanger is uniformly subjected to wind, and the heat exchange capacity is not reduced. Moreover, under the support of the fixed pitch module 300, even under the influence of the fan, the tube-fin units 101 will not shake and produce abnormal noise, and the connection between the tube-fin units 101 and the flow collecting structure 200 will not leak due to shaking.

[0040] For example Figure 2 and Figure 3As shown, the above-mentioned tube-fin monomer 101 adopts heat exchange materials such as aluminum alloy, copper alloy, etc., and is formed into an integrated structure by extrusion or casting process. The fin part 102 is in a flat plate shape, and the flow passage part 103 is in a circular tube shape extending in a straight line. The fluid passage 104 extends along the length direction of the flow passage part 103 and penetrates through the flow passage part 103. The flow passage part 103 is provided in multiple, and the fin part 102 is provided in multiple. The fin part 102 and the flow passage part 103 are alternately arranged in the second direction (the second direction is perpendicular to the first direction). Two adjacent fin parts 102 are separated by a flow passage part 103, and the plate-shaped tube-fin monomer 101 is formed. The multiple flow passage parts 103 are arranged at equal intervals in the second direction, and the distance is H. The ends of the tube-fin monomer 101 in the second direction are preferably fin parts 102. However, it is not limited thereto. For example, the number of flow passage parts 103 can also be one, and the flow passage part 103 can also be a flat tube, a square tube, etc. The thickness of the fin part 102 of the tube-fin monomer 101 is recommended to be 0.4 mm or less under the premise that the process can be achieved. Too thick thickness will cause larger wind resistance and higher cost. The use of thinner fin part 102 can reduce the wind resistance. At the same time, the fin pitch can be reduced when the heat exchange amount is ensured, so that the heat exchanger is more compact. The diameter of the fluid passage 104 of the tube-fin monomer 101 is 0.4 mm or less. At this time, the refrigerant filling amount in the system is reduced, and the pipe diameter is small, so the wind resistance is also reduced. For example, the thickness of the fin part 102 is 0.3 mm, the diameter of the fluid passage 104 is 0.35 mm, the number of flow passage parts 103 is 4, and the distance between adjacent tube-fin monomers is 1.5 mm. At this time, the unit wind area heat exchange amount of the heat exchanger is increased by 9%, and the wind resistance is increased by 1%. For another example, the thickness of the fin part 102 is 0.2 mm, the diameter of the fluid passage 104 is 0.35 mm, the number of flow passage parts 103 is 4, and the distance between adjacent tube-fin monomers is 1.4 mm. At this time, the unit wind area heat exchange amount of the heat exchanger is increased by 12%, and the wind resistance is reduced by 8%. It can be seen that the tube-fin monomer 101 improves the heat exchange capacity of the heat exchanger. In addition, the sizes of all tube-fin monomers 101 are the same, the positions of the flow passage parts 103 are consistent, the distance between adjacent tube-fin monomers 101 is the fin pitch, each fin pitch is equal, and the distance between two tube-fin monomers 101 is less than or equal to 1.6 mm.

[0041] As shown in Figure 1 , Figure 6 and Figure 7 , the above-mentioned tube-fin assembly 100 also includes two side plates 105. The two side plates 105 are consistent with the length and width of the tube-fin monomer 101, adopt a plate-shaped profile, and have the same material as the tube-fin monomer 101. The two side plates 105 are parallel to the tube-fin monomer 101, and all tube-fin monomers 101 are clamped between the two side plates 105. At the same time, the distance between the side plate 105 and the adjacent tube-fin monomer 101 is equal to the distance between the tube-fin monomers 101.

[0042] AsFigure 5 and Figure 6 As shown, the current collection structure 200 includes a base plate 201. The base plate 201 has multiple second slots 204 and two first slots 203 on one side, and an inlet / outlet 202 at one end. A current collection pipe (not shown) is also provided within the base plate 201, which connects the second slots 204 and the inlet / outlet 202. Each finned unit 101 is inserted into the second slots 204 of the two current collection structures 200 and further fixed by welding, forming multiple finned units 101 arranged parallel and spaced apart. The fluid channel 104 connects the two current collection structures 200; one current collection structure 200 acts as a current collection unit, and the other acts as a current distribution unit. Simultaneously, both ends of the side plate 105 are inserted into the first slots 203 and are also connected to the current collection structure. When the heat exchanger is running, the refrigerant enters a manifold 200 and then flows into the fluid channel 104 of each tube-finned unit 101 to evaporate or condense and exchange heat with the outside air. It then gathers in another manifold 200 and flows out.

[0043] In some exemplary embodiments, such as Figure 4 , Figure 7 and Figure 8 As shown, there are two fixed-pitch modules 300, located on opposite sides of the tube fin assembly 100. Specifically, each fixed-pitch module 300 includes a long strip-shaped base 302, which is plate-shaped and integral with the protrusions 301. The base 302 is made of the same material as the tube fin unit 101. The base 302 further includes an adjacent intermediate plate 303 and two connecting plates 304. The intermediate plate is a straight-extending long strip, and the two connecting plates 304 are located at opposite ends of the intermediate plate 303, thus forming a U-shape. The protrusions 301 are also plate-shaped, located on the intermediate plate 303, and are evenly spaced along the length of the intermediate plate 303, so that all protrusions 301 are located within the groove formed by the intermediate plate 303 and the connecting plates 304. A groove 305 is formed between adjacent protrusions 301. The width of the groove 305 is equal to the thickness of the fin portion 102, and the width S of the protrusion 301 is equal to the width of the air duct 400, i.e., S = H.

[0044] When the fixed-pitch module 300 is assembled with the tube-fin assembly 100, the fixed-pitch module 300 is arranged along the first direction, and the length of the fixed-pitch module 300 is greater than the extension size of the tube-fin assembly 100 in the first direction, so that the two connecting plates 304 on the fixed-pitch module 300 respectively correspond to the two side plates 105 away from the tube-fin monomer 101. At the same time, the convex body 301 corresponds to the air duct 400 one by one, and the convex body 301 is inserted into the corresponding air duct 400 along the second direction. The two ends of the convex body 301 in the first direction respectively abut against the fin parts 102 at the two ends of the tube-fin monomer 101, ensuring close contact, supporting, and improving overall compactness.

[0045] In some example embodiments, as shown in Figure 3 and Figure 8 , the extension length of the convex body 301 is L, and the width of the fin part 102 at the two ends of the tube-fin monomer 101 in the second direction is M, where L is less than M, so that the convex body 301 cannot extend to the flow channel part 103 at the edge of the tube-fin monomer 101 in the second direction, and does not contact the flow channel part 103, avoiding interference between the convex body 301 and the flow channel part 103, and preventing the convex body 301 from damaging the flow channel part 103.

[0046] In some example embodiments, as shown in Figure 3 and Figure 8 , one end of the convex body 301 is connected to the intermediate plate 303, and the other end is inserted into the air duct 400. The end of the convex body 301 inserted into the air duct 400 is provided with a rounded corner 311 at the corner, which facilitates insertion of the convex body 301 and can also prevent the convex body from scratching the tube-fin monomer 101. The corner of the convex body 301 is not limited to only the rounded corner 311, for example, it can also be a bevel or chamfer.

[0047] In some example embodiments, as shown in Figure 1 and Figure 7 , in order to facilitate welding and prevent the fixed-pitch module 300 from being misaligned or falling off, the heat exchanger further comprises a positioning module 500, which can limit the fixed-pitch module 300 and facilitate installation of the fixed-pitch module 300. Specifically, the positioning module 500 comprises two positioning plates 501, and the two side plates 105 are provided with the positioning module 500. The two positioning plates 501 are an integral part of one side plate 105 and are located away from the tube-fin monomer 101. The two positioning plates 501 are spaced apart, and the distance therebetween is slightly greater than the thickness of the connecting plate 304. During installation, the connecting plates 304 at the two ends of the fixed-pitch module 300 can be clamped between the two positioning modules 500, i.e., one connecting plate 304 is clamped between the two positioning plates 501, and the other connecting plate 304 is clamped between the other two positioning plates 501.

[0048] In some example embodiments, the above-mentioned tube-fin assembly 100, the current collecting structure 200, and the fixed-pitch module 300 are further integrated by furnace welding. Before welding, two fixed-pitch modules 300 are installed on the tube-fin assembly 100, and both of the two fixed-pitch modules 300 are positioned by the same positioning module 500 on the side plate. After welding, the convex body 301 is integrated with the two tube-fin units 101 on both sides, the connecting plate 304 is integrated with the positioning module 500, and the tube-fin assembly 100 is integrated with the connecting part of the current collecting structure 200.

[0049] In some example embodiments, the fixed-pitch module 300 is provided with one, which is only located on one side of the tube-fin assembly 100, i.e. the windward side or the leeward side, and can also limit the pitch.

[0050] In some example embodiments, the fixed-pitch module 300 is arranged obliquely relative to the tube-fin unit 101, and is not arranged along the first direction, but the two ends of the fixed-pitch module 300 are still located at the two ends of the tube-fin assembly 100 in the length direction, and can also limit the pitch.

[0051] In some example embodiments, the positioning module 500 is arranged on the tube-fin assembly 100, or the positioning module 500 is arranged on the side of the side plate 105 facing the tube-fin unit 101, which can also limit the fixed-pitch module 300.

[0052] In some example embodiments, as shown in FIG. 6, the fixed-pitch module 300 is arranged on the side plate 105 of the tube-fin assembly 100, and the positioning module 500 is arranged on the side of the side plate 105 facing the tube-fin unit 101, which can also limit the fixed-pitch module 300. Figures 9 to 11As shown, the number of the fixed-pitch modules 300 is an even number (i.e., 2n, where n is greater than or equal to 1). These fixed-pitch modules 300 are located on both sides of the tube-fin assembly 100, thus dividing them into a first module 312 and a second module 313. The first module 312 is located on one side of the tube-fin assembly 100, and the second module 313 is located on the other side. The first module 312 and the second module 313 have identical structures. The connecting plate 304 at one end of the base 302 of the first module 312 has a protruding boss 306, which is cylindrical. The connecting plate 304 at the other end of the base 302 has a circular through hole 307. The connecting plate 304 at one end of the base 302 of the second module 313 also has a protruding boss 306, which is cylindrical. The connecting plate 304 at the other end of the base 302 also has a circular through hole 307. During installation, the boss 306 of the first module 312 is inserted into the corresponding through hole 307 of the second module 313, and the boss 306 of the second module 313 is inserted into the corresponding through hole 307 of the first module 312, so that the first module 312 and the second module 313 form a ring, enclosing the tube fin assembly 100 within it. The aforementioned side plate 105 is also provided with a positioning plate 501, which supports the aforementioned connecting plate 304. This structure can also eliminate the need for positioning modules 500, as the two mutually constrain each other, clamping the tube fin assembly 100 and limiting the position of each positioning module 500. In addition, the first module 312 and the second module 313 are not limited to being inserted; they can also be connected by snap-fit ​​or screw connection, etc.

[0053] In some exemplary embodiments, such as Figures 12 to 14 As shown, the connecting plate 304 has a sliding hook 308 at the end away from the intermediate plate 303. During installation, the end of the connecting plate 304 with the sliding hook 308 extends to the other side of the tube fin assembly 100 and fastens to the edge of the side plate 105, forming a connection between the connecting plate 304 and the side plate 105. This relatively fixes the tube fin assembly 100 and the fixed-pitch module 300 to prevent the fixed-pitch module 300 from being misaligned or falling off during welding. In addition, multiple fixed-pitch modules 300 are provided on both sides of the tube fin assembly 100, and the fixed-pitch modules 300 on both sides are staggered.

[0054] In some exemplary embodiments, such as Figure 15As shown, the base 302 of the fixed-pitch module 300 includes a first plate segment 309 and a second plate segment 310, both of which are provided with the convex body 301. The first plate segment 309 extends from the middle of the tube-fin assembly 100 to one end in the first direction, and the second plate segment extends from the middle of the tube-fin assembly 100 to the other end in the first direction. The first plate segment 309 and the second plate segment 310 jointly cover the tube-fin monomers 101 and support all the air ducts. The fixed-pitch module 300 can also maintain the pitch of the tube-fin monomers 101 and ensure the heat exchange capacity.

[0055] In some example embodiments, an air conditioner includes the heat exchanger described above.

[0056] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0057] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0058] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0060] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0061] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A heat exchanger comprising a tube-fin assembly and header structures provided at both ends of the tube-fin assembly, the tube-fin assembly comprising a plurality of tube-fin units arranged at intervals in a first direction, a wind channel being formed between two adjacent tube-fin units, characterized in that, The heat exchanger further comprises a fixed pitch module, which is arranged at least on one side of the tube-fin assembly, and is provided with a plurality of protrusions inserted into the air duct, the two ends of the protrusions in the first direction abutting against two tube-fin units respectively to limit the distance between the adjacent tube-fin units. The fixed pitch module comprises a base body, which extends from one end to the other end of the tube-fin assembly in the first direction, and the protrusions are arranged on the base body. The base body comprises an intermediate plate and two connecting plates arranged at the two ends of the intermediate plate, the intermediate plate and the two connecting plates form a U shape, and the protrusions are arranged on the intermediate plate, and the two connecting plates are arranged at the two ends of the tube-fin assembly in the first direction respectively.

2. The heat exchanger of claim 1, wherein The fixed pitch module is provided with one or a plurality of fixed pitch modules, and the plurality of fixed pitch modules are arranged on opposite sides of the tube-fin assembly, and the fixed pitch modules on the two sides are arranged in alignment or staggered.

3. The heat exchanger of claim 2, wherein The base body extends in the first direction or is arranged obliquely relative to the tube-fin unit, and the plurality of protrusions are arranged at intervals along the length direction of the base body.

4. The heat exchanger of claim 3, wherein The connecting plate extends to the other side of the tube-fin assembly from the end away from the intermediate plate, and the connecting plate comprises a sliding hook arranged at the end away from the intermediate plate, and the sliding hook is connected to the side of the tube-fin assembly away from the intermediate plate.

5. The heat exchanger of claim 3, wherein The plurality of fixed pitch modules comprise a first module and a second module, the first module and the second module are arranged on opposite sides of the tube-fin assembly respectively, and the connecting plates of the first module and the second module are connected correspondingly.

6. The heat exchanger of claim 5, wherein One of the connecting plates in the first module is provided with a boss, and the other connecting plate is provided with a through hole; one of the connecting plates in the second module is provided with a boss, and the other connecting plate is provided with a through hole; the boss of the first module is inserted into the through hole of the second module correspondingly; and the boss of the second module is inserted into the through hole of the first module correspondingly.

7. A heat exchanger according to any one of claims 1-6, c h a r a c t e r i s e d in that The length of the protrusion in the first direction is equal to the width of the air duct.

8. The heat exchanger according to any one of claims 1 to 6, wherein The tube-fin unit comprises a fin part and a flow channel part, the fin part and the flow channel part are integrally formed and arranged alternately in the second direction; the two ends of the tube-fin unit in the second direction are provided with two fin parts with a width of M, and the protrusion extends in the second direction and the extension length is L, which is less than M.

9. The heat exchanger according to any one of claims 1 to 6, wherein The free end of the protrusion is provided with a rounded corner at the corner.

10. The heat exchanger according to any one of claims 1 to 6, wherein The tube-fin assembly is provided with a positioning module for limiting the fixed pitch module.

11. The heat exchanger according to any one of claims 1 to 6, wherein The tube-fin assembly further comprises two side plates, which are arranged in parallel and at intervals with the tube-fin unit at the two ends of the tube-fin assembly in the first direction, and the two ends of the side plate are inserted into the two current collecting structures respectively.

12. An air conditioner characterized by comprising: The heat exchanger comprises any one of claims 1-11.

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