Fin, heat exchanger and air conditioning system

Abstract

The application relates to a fin, a heat exchanger and an air conditioning system, comprising at least two fin parts which are sequentially connected in head-tail mode along a preset air flow direction. Among each two adjacent fin parts, at least one pipe hole is arranged on the fin part at the upstream, each pipe hole is arranged in a penetrating mode along the thickness direction of the fin, the pipe hole is used for sleeving a heat exchange pipe, the fin part at the downstream has a backflow surface which blocks the air flow path, and the backflow surface is arranged opposite to the heat exchange pipe sleeved on the fin part at the upstream. The backflow surface is arranged on the fin part at the downstream, the air on the leeward side of the heat exchange pipe is disturbed by the backflow surface, the contact probability of the leeward side of the heat exchange pipe and the air is increased, the heat exchange efficiency of the leeward side of the heat exchange pipe and the air is improved, and the heat exchange efficiency of the leeward side of the heat exchange pipe is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to a fin, a heat exchanger and an air conditioning system. BACKGROUND

[0002] A heat exchanger is a device for heat exchange through temperature difference. The heat exchanger (such as an evaporator and a condenser) used in an air conditioning system is usually designed as a heat exchanger, and the refrigerant flowing in the pipe is heated or cooled with phase change heat transfer, so that the heat exchange coefficient is high. The heat exchanger is provided with a fin structure on the refrigerant pipe, the fin structure can strengthen the heat exchange area, increase the fluid turbulence, introduce the secondary flow of air, and increase the heat transfer. However, since the airflow always flows from one side to the other side, the heat exchange efficiency of the leeward side of the heat exchanger refrigerant pipe is still low. SUMMARY

[0003] The present application aims at the problem of low heat exchange efficiency of the leeward side of the existing heat exchanger, and provides a fin, a heat exchanger and an air conditioning system, which have the technical effect of good heat exchange effect.

[0004] A fin, comprising:

[0005] At least two fins are connected in sequence along a preset flow direction;

[0006] Among each two adjacent fins, the fin located upstream is provided with at least one pipe hole, and each pipe hole is provided through along the thickness direction of the fin, and the pipe hole is used for sleeving a heat exchange pipe,

[0007] The fin located downstream has the backflow surface blocking the air flow path, and the backflow surface is arranged opposite to the heat exchange pipe sleeved by the fin located upstream.

[0008] In one embodiment, the tail end of the fin located downstream of each two adjacent fins is overlapped with the head end of the fin located upstream.

[0009] The tail end of each fin in each two adjacent fins is located on the same side of the fin in the thickness direction.

[0010] The side surface of each fin located downstream towards the fin located upstream is configured as the backflow surface.

[0011] In one embodiment, each backflow surface has at least two backflow sections arranged along a preset array direction, each fin located upstream has at least two pipe holes, the at least two pipe holes are arranged at intervals in the array direction, and the array direction, the flow direction and the thickness direction are spatially intersected two by two.

[0012] The at least two return flow sections are arranged in one-to-one correspondence with the heat exchange tubes sleeved with the at least two tube holes on the fins upstream of the return flow sections, and each return flow section is arranged in a recessed manner away from the tube hole corresponding to the return flow section in the flow direction.

[0013] In one embodiment, in an orthographic projection parallel to a plane in the flow direction and the array direction, each return flow section is in the shape of a circular arc.

[0014] In one embodiment, in an orthographic projection parallel to a plane in the flow direction and the array direction, the center of each tube hole is located on a perpendicular bisector of the return flow section corresponding to the tube hole.

[0015] In one embodiment, in an orthographic projection parallel to a plane in the flow direction and the array direction, the center of the tube hole adjacent to each tube hole in the array direction is located on a circumference on which the return flow section corresponding to the tube hole is located.

[0016] In one embodiment, in the array direction, the distance between the centers of any two adjacent tube holes is a pitch P;

[0017] In an orthographic projection parallel to a plane in the flow direction and the array direction, the distance between the two ends of each return flow section is a chord length C;

[0018] The chord length C and the pitch P satisfy: C = P (unit: mm).

[0019] In one embodiment, an orthographic projection of the fin in a first plane perpendicular to the thickness direction is a first projection, and an orthographic projection of the first projection in a second plane perpendicular to the flow direction is a second projection.

[0020] In the second projection, the center of each tube hole in each fin is arranged staggered in the array direction from the center of each tube hole in other fins.

[0021] In one embodiment, in the second projection, the center of two adjacent tube holes in each fin in the array direction contains the center of one tube hole in other fins.

[0022] In one embodiment, in the second projection, the center of each tube hole is arranged adjacent to the center of a tube hole in an adjacent fin.

[0023] In one embodiment, each fin has a pitch P (unit: mm) between the centers of any two adjacent tube holes in the array direction.

[0024] Each of the fins has a column of the tube holes arranged along the array direction, and the number of the arranged columns of the tube holes in the fin is denoted as M (M≥2, and is a positive integer);

[0025] In the second projection, the distance L between the centers of any two tube holes satisfies L=P / M.

[0026] In one of the embodiments, the hole distance P and the hole diameter Ф of each of the tube holes satisfy P≥2Ф (unit: mm).

[0027] In one of the embodiments, the arranged number of columns M, the hole distance P, and the hole diameter Ф satisfy M≤P / Ф.

[0028] In one of the embodiments, in the flow direction, the distance between adjacent return flow surfaces is a distance W, and the distance W and the hole diameter Ф of each of the tube holes satisfy W≥1.5Ф.

[0029] In one of the embodiments, in the flow direction, the distance between the centers of adjacent tube holes is a distance S, and the distance S and the hole diameter Ф of each of the tube holes satisfy S≥1.5Ф.

[0030] In one of the embodiments, the thicknesses of all the fins are equal in the flow direction.

[0031] A heat exchanger, comprising:

[0032] A heat exchange tube; and

[0033] The fin as claimed in any one of the above, the fins are spaced apart along the thickness direction, and all the tube holes having the same projection in the thickness direction of all the fins are sleeved on the same heat exchange tube.

[0034] In one of the embodiments, the size of each of the return flow surfaces in the thickness direction is denoted as K (unit: mm), and the maximum spacing of adjacent two fins is denoted as F (unit: mm); the F and the K satisfy F≥2K.

[0035] In one of the embodiments, the maximum sizes of each of the fins in the thickness direction are equal and are denoted as T (unit: mm), each of the fins has a column of the tube holes arranged along a preset array direction, and the number of the arranged columns of the tube holes in the fin is denoted as M (M≥2, and is a positive integer), wherein (M+1)K=F-T.

[0036] An air conditioning system, comprising the heat exchanger as described above.

[0037] In the aforementioned fins, heat exchangers, and air conditioning system, when air flows roughly in the direction of airflow, it first flows through the heat exchange tubes on the upstream fins and undergoes heat exchange, then continues to flow towards the downstream fins. During this flow, some air comes into contact with the return flow surface of the downstream fins and is blocked by the return flow surface. The blocked air changes its flow direction and disturbs the air on the leeward side of the heat exchange tubes, generating a turbulence effect. Under this turbulence effect, the probability of contact between the leeward side of the heat exchange tubes and the disturbed air increases, thereby improving the heat exchange efficiency on the leeward side of the heat exchange tubes. Compared with existing technologies, turbulence on the leeward side of the heat exchange tubes by using the return flow surface can increase the probability of contact between the leeward side of the heat exchange tubes and the air, thereby improving the heat exchange efficiency on the leeward side of the heat exchange tubes. Attached Figure Description

[0038] Figure 1 This is a front view of the fins in some embodiments of this application;

[0039] Figure 2 for Figure 1 Side view of the fin shown;

[0040] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0041] Figure 4 for Figure 1 The dimensions of the fins are shown in the diagram.

[0042] Figure 5 for Figure 1 A schematic diagram showing the projection relationship of the fins;

[0043] Figure 6 This is a schematic diagram of the structure of a heat exchanger provided in some embodiments of this application;

[0044] Figure 7 for Figure 6 The diagram shows the structural schematic of the finned portion of the heat exchanger.

[0045] Figure 8 for Figure 7 Enlarged view of point B in the middle.

[0046] Explanation of reference numerals in the attached figures:

[0047] 100. Heat exchanger; 10. Fin; 11. Fin section; 11a. Head end; 11b. Tail end; 11c. Tube hole; M. Reflux surface; m. Reflux section; 111. First fin; 112. Second fin; 113. Third fin; 114. Fourth fin; 20. Heat exchange tube; F1. Drainage direction; F2. Thickness direction; F3. Array direction; o1. Center of tube hole; o2. Center of reflux section. Detailed Implementation

[0048] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the detailed description of the specific embodiments of the present application is made below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways without the specific details described herein, and it is understood that similar improvements and modifications can be made without departing from the spirit and scope of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "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 a limitation of the present application.

[0050] In addition, the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "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, for example, two, three, etc., unless otherwise specifically limited.

[0051] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically 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.

[0052] In this application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can be 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 be that the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0053] It should be noted that when an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not the only implementation.

[0054] The fin provided by the embodiments of the present application is mainly applied to a tube-fin heat exchanger. The tube-fin heat exchanger generally comprises fins and heat exchange tubes. The heat exchange tubes have flow channels for circulating heat exchange agents, and the fins have tube holes. The fins are sleeved on the heat exchange tubes via the tube holes. Since the fins are connected to the heat exchange tubes, the heat exchange area can be increased by the fins, and the heat exchange efficiency can be improved. The heat exchange agents circulating in the heat exchange tubes can be cold agents and hot agents. The cold agents are, for example, liquid refrigerants, cold water, etc., and the hot agents are, for example, gaseous refrigerants, hot water, etc. Generally, air flows from one side of the heat exchanger to the other side, and exchanges heat with the fins and the heat exchange tubes in the process of flowing through the heat exchanger, so as to realize heat exchange. Generally, the fins in the heat exchanger comprise a plurality of fins. The plurality of fins are arranged in sequence and at intervals along the extension direction of the heat exchange tubes. Air flow channels are formed between adjacent fins for air flow. The air flows from one side of the heat exchanger to the other side via the air flow channels.

[0055] The flow direction of the fin mentioned in the embodiments of the present application corresponds to the flow direction of the air. "Upstream" and "downstream" refer to the upstream and downstream relationship in the flow direction.

[0056] Figure 1 A front view of the fin 10 in some embodiments of the present application, Figure 2 A side view of the fin 10 shown in Figure 1 An enlarged view of position A in Figure 3 A front view of the fin 10 shown in Figure 2 An enlarged view of position A in Figure 1 A front view of the fin 10 shown in Figure 2Some embodiments of the present application provide a fin 10, which includes at least two fin portions 11 connected in sequence along a preset air flow direction F1. Among each two adjacent fin portions 11, the fin portion 11 located upstream is configured with at least one tube hole 11c, each of which is arranged through along the thickness direction F2 of the fin 10, and the tube hole 11c is used for sleeving a heat exchange tube 20, and the fin portion 11 located downstream has a backflow surface M which is arranged opposite to the heat exchange tube 20 sleeved on the fin portion 11 located upstream.

[0057] The air flow direction F1 refers to the direction in which the fin 10 guides the air flow, specifically, the air flows from one side to the other side of the fin 10 along the air flow direction F1. Figure 1 In the embodiments shown in the drawings, the air flow direction F1 is from left to right. Figure 1 In the embodiments shown in the drawings, the air flow direction F1 is from left to right.

[0058] Understandably, each fin portion 11 can be either the fin portion 11 located upstream or the fin portion 11 located downstream. The backflow surface M of the fin portion 11 located on the air flow path means that when the air flows from one side to the other side of the fin 10 along the air flow direction F1, the air is blocked by the backflow surface M.

[0059] For the convenience of description, among any two adjacent fin portions 11, the fin portion 11 located upstream is referred to as the upstream fin portion 11, and the fin portion 11 located downstream is referred to as the downstream fin portion 11. The side of the heat exchange tube 20 opposite to the backflow surface M of the downstream fin portion 11 is the leeward side of the heat exchange tube 20, and vice versa. Understandably, the backflow surface M is arranged opposite to the leeward side of the heat exchange tube 20.

[0060] When the air flows along the air flow direction F1, the air first flows through the heat exchange tube 20 on the upstream fin portion 11 and exchanges heat, and then continues to flow to the downstream fin portion 11. In the process of flowing, part of the air contacts the backflow surface M of the downstream fin portion 11 and is blocked by the backflow surface M. The blocked air changes the flow direction and disturbs the air on the leeward side of the heat exchange tube 20, generating a turbulence effect. Under the turbulence effect, the contact probability of the leeward side of the heat exchange tube 20 and the disturbed air increases, thereby improving the heat exchange efficiency of the leeward side of the heat exchange tube 20.

[0061] The fin 10 described above, by configuring the backflow surface M on the fin portion 11 located downstream, can disturb the air on the leeward side of the heat exchange tube 20 through the backflow surface M, increase the contact probability of the leeward side of the heat exchange tube 20 and the air, and thereby improve the heat exchange efficiency of the leeward side of the heat exchange tube 20.

[0062] In some embodiments, please refer to Figure 2 and Figure 3 In each pair of adjacent wing sections 11, the tail end 11b of the downstream wing section 11 overlaps the head end 11a of the upstream wing section 11, and the fins 10 of the tail ends 11b of each pair of adjacent wing sections 11 are on the same side in the thickness direction F2. The surface of the downstream wing section 11 facing the upstream wing section 11 is constructed as a backflow surface M.

[0063] Understandably, the tail end 11b and the head end 11a of the wing 11 are arranged along the drainage direction F1. For example... Figure 2 In the accompanying drawings, the left end of each wing 11 is its head end 11a, and the right end of each wing 11 is its tail end 11b. The tube hole 11c of each fin 10 is located between the tail end 11b and the head end 11a of each fin 10. The thickness direction F2 of the fin 10 is consistent with the thickness direction F2 of each wing 11. Figure 2 In the attached figures, the thickness direction F2 is the vertical direction. The tail end 11b of each wing 11 located downstream overlaps the upper (or lower) side of the head end 11a of each wing 11 located upstream.

[0064] like Figure 3 As shown, the leading end 11a of the downstream wing 11 overlaps the trailing end 11b of the upstream wing 11, and a return flow surface M is formed on the side surface of the leading end 11a of the downstream wing 11 facing the upstream wing 11. The shape of the return flow surface M varies depending on the shape of this side surface. The return flow surface M can be a plane or a curved surface.

[0065] The specific fixing method for the overlap between the first end 11a of the downstream wing 11 and the tail end 11b of the upstream wing 11 can be bonding, fastening, welding, fusion, etc., and is not limited to any specific method.

[0066] At this point, the flow return surface M is formed by designing the first end 11a of the downstream wing 11 to overlap the tail end 11b of the upstream wing 11. The thickness of each wing 11 can be selected from the same material, the wing 10 is easy to form, and the structure is simple.

[0067] In other embodiments, the fins 11 and the return surfaces M can also be formed by machining stepped surfaces on a sheet metal.

[0068] In some embodiments, please refer to Figure 1Each reflux surface M has at least two reflux sections m arranged along a preset array direction F3. Each fin 11 located upstream has at least two tube holes 11c, which are spaced apart along the array direction F3. The array direction F3, the flow direction F1, and the thickness direction F2 intersect each other spatially. The heat exchange tubes 20 connected to the at least two reflux sections m and the at least two tube holes 11c on the fin 11 located upstream of the fin are arranged in a one-to-one correspondence, and each reflux section m is recessed along the flow direction F1 away from its corresponding tube hole 11c.

[0069] The wing 11 located upstream of the return flow section m refers to the wing 11 located upstream of the wing 11 in the return flow section m. Two wings 11 that have an upstream-downstream relationship in the flow direction F1 refer to two adjacent wings 11.

[0070] like Figure 1 As shown, the array direction F3 can be Figure 1 The vertical direction of the view. The spatial intersection of the array direction F3, the drainage direction F1, and the thickness direction F2 means that each of the three intersects with every other direction and they are not coplanar. For example, the array direction F3, the drainage direction F1, and the thickness direction F2 are perpendicular to each other.

[0071] The spacing between at least two apertures 11c in the array direction F3 includes two cases: First, the center o1 of each aperture 11c is located on the same straight line parallel to the array direction F3, and the center o1 of two adjacent apertures 11c is spaced apart in the array direction F3. Second, the center o1 of each aperture 11c is not simultaneously located on a straight line parallel to the array direction F3, but the center o1 of two adjacent apertures 11c is spaced apart in the array direction F3.

[0072] Preferably, the tube holes 11c on each fin 11 are arranged along the array direction F3 (i.e., the center o1 of each tube hole 11c is located on the same straight line parallel to the array direction F3), so that the interval between each tube hole 11c and each reflux section m is consistent, and the heat exchange efficiency of the heat exchange tube 20 sleeved on each tube hole 11c is more uniform.

[0073] The indentation of each return flow section m away from the corresponding pipe hole 11c refers to the indentation of each return flow section m along the flow direction F1. Specifically, the indentation of the return flow section m can be a spherical surface, a groove surface, an arc surface, etc., and there is no specific limitation.

[0074] At this time, each recirculation section m is designed as a concave structure. The concave recirculation section m will form a concave space. After the air enters the concave space, the airflow towards the leeward side of the heat exchange tube 20 is larger, which has a better effect on the air turbulence on the leeward side of the heat exchange tube 20, and the heat exchange efficiency on the leeward side of the heat exchange tube 20 is higher.

[0075] Figure 4 for Figure 1The dimensioned drawing of the fin 10 shown.

[0076] In some embodiments, referring to Figure 1 and Figure 4 In the orthographic projection parallel to the flow direction F1 and the array direction F3, each return flow section m is in the shape of a circular arc.

[0077] When the return flow surface M is in the shape of a circular arc, the air flow changes direction after flowing to the return flow surface M with less energy loss, and the air flow changed direction by the return flow surface M has a tendency to return to the center of the return flow surface M, that is, the air flow can form a larger air volume to flow to the leeward side of the heat exchange tube 20, and the turbulence effect on the leeward side of the heat exchange tube 20 is better, and the heat exchange efficiency of the leeward side of the heat exchange tube 20 is higher.

[0078] In some embodiments, referring to Figure 4 In the orthographic projection parallel to the flow direction F1 and the array direction F3, the center o1 of each tube hole 11c is located on the perpendicular bisector of the corresponding return flow section m.

[0079] The perpendicular bisector refers to the center line of symmetry of the return flow section m. The center o2 of the return flow section m is located on the perpendicular bisector. The center o1 of the tube hole 11c is the geometric center. When the tube hole 11c is a circular hole, the center o1 of the tube hole 11c is the center of the circular hole. When the tube hole 11c is a square hole, the center o1 of the tube hole 11c is the intersection of the two diagonal lines of the square hole.

[0080] Since the air flow changed direction by the return flow surface M has a tendency to return to the center of the return flow surface M, the tube hole 11c is located on the perpendicular bisector of the corresponding return flow section m, that is, the return flow air can flow to the wake vortex area formed by the air on the leeward side of the heat exchange tube 20 sleeved in the tube hole 11c, so that the turbulence effect of the return flow air on the air on the leeward side of the heat exchange tube 20 is the best, and the heat exchange efficiency of the leeward side of the heat exchange tube 20 is the highest.

[0081] In some embodiments, referring to Figure 4 In the orthographic projection parallel to the flow direction F1 and the array direction F3, the center o1 of each tube hole 11c adjacent to each tube hole 11c in the array direction F3 is located on the circumference of the return flow section m corresponding to each tube hole 11c.

[0082] When a tube hole 11c is adjacent to two tube holes 11c, the centers o1 of the two tube holes 11c adjacent to the tube hole 11c are located on the circumference of the return flow section m corresponding to the tube hole 11c.

[0083] Among the air blocked by the reflux section m, part of the air will reflux along the circumference of the reflux section m, and when the center o1 of the tube hole 11c adjacent to the tube hole 11c is located on the circumference of the reflux section m, it is just located on the reflux path of the part of the air refluxing along the circumference of the reflux section m.

[0084] That is, the air blocked by the reflux section m corresponding to the tube hole 11c can not only generate a disturbance effect on the leeward side of the heat exchange tube 20 sleeved on the tube hole 11c, but also generate a certain disturbance effect on the leeward side of the heat exchange tube 20 sleeved on the adjacent tube hole 11c. In this way, the disturbance range of the same reflux surface M is expanded, and the heat exchange efficiency of the heat exchange tube 20 is higher.

[0085] In some embodiments, referring to Figure 4 In the array direction F3, the distance between the centers of any two adjacent tube holes 11c is the hole pitch P, and in the orthographic projection in the plane parallel to the flow direction F1 and the array direction F3, the distance between the two ends of each reflux section m is the chord length C; the chord length C and the hole pitch P satisfy: C=P (unit: mm).

[0086] The orthographic projection of the fin 10 in the plane parallel to the flow direction F1 and the array direction F3 is shown in the view as shown in Figure 1 and Figure 4 .

[0087] As shown in Figure 4 , the chord length C is the distance between the two ends of the circular arc-shaped reflux section m. The distance between the centers o1 of the two adjacent tube holes 11c in the array direction F3 is the hole pitch P. That is, the distance between the centers of each tube hole 11c is the hole pitch P.

[0088] When the chord length C is equal to the hole pitch P, the same reflux section m will not correspond to two tube holes 11c, so that each reflux hole can correspond to the heat exchange tube 20 used to mainly enhance the heat exchange efficiency of one tube hole 11c, which is more convenient for the design of improving the heat exchange efficiency.

[0089] Figure 5 The projection relationship diagram of the fin 10 is shown in Figure 1 .

[0090] In some embodiments, referring to Figure 5 , the orthographic projection of the fin 10 in the first plane perpendicular to the thickness direction F2 is the first projection; the orthographic projection of the first projection in the second plane perpendicular to the flow direction F1 is the second projection; in the second projection, the center o1 of each tube hole 11c in each fin portion 11 is arranged staggered in the array direction F3 from the center o1 of each tube hole 11c in the other fin portion 11.

[0091] It should be noted that, in Figure 5In the second projection, the centers of the tube holes 11c and the tube holes in the other fins 11 are staggered in the array direction F3, that is, the centers o1 of the tube holes 11c of the different fins 11 do not coincide with each other in the second projection.

[0092] In the second projection, the tube holes 11c and the tube holes in the other fins 11 are staggered in the array direction F3, that is, the centers o1 of the tube holes 11c of the different fins 11 do not coincide with each other in the second projection. For example, Figure 5 In the embodiment shown, in the first projection, the a1 tube hole, the a2 tube hole, the a3 tube hole, the a4 tube hole, and the a5 tube hole are located in the same fin 11 and are arranged at intervals in the array direction F3, the b1 tube hole, the b2 tube hole, the b3 tube hole, the b4 tube hole, and the b5 tube hole are located in the same fin 11 and are arranged at intervals in the array direction F3, and the c1 tube hole, the c2 tube hole, the c3 tube hole, the c4 tube hole, and the c5 tube hole are located in the same fin 11 and are arranged at intervals in the array direction F3. In the second projection, the a1 tube hole to the a5 tube hole, the b1 tube hole to the b5 tube hole, and the c1 tube hole to the c5 tube hole are located on a straight line parallel to the array direction F3, and the circles do not coincide with each other.

[0093] Generally, the heat exchange tubes 20 fitted in the tube holes 11c have the same size, and when the centers o1 of the tube holes 11c are staggered in the array direction F3, the downstream heat exchange tube 20 is not completely blocked by the upstream heat exchange tube 20, so that the heat exchange efficiency of the windward side of each heat exchange tube 20 can be improved.

[0094] In some embodiments, in the second projection, the centers o1 of two adjacent tube holes 11c of each fin 11 in the array direction F3 contain the center o1 of a tube hole 11c in the other fins 11.

[0095] In the embodiment shown, Figure 5 In the embodiment shown, the size of all the tube holes 11c is the same. For example, Figure 5 As shown, in the second projection, the center of the b2 tube hole and the center of the c2 tube hole exist between the center of the a1 tube hole and the center of the a2 tube hole, the center of the a1 tube hole and the center of the c2 tube hole exist between the center of the b1 tube hole and the center of the b2 tube hole, and the center of the a1 tube hole and the center of the a2 tube hole exist between the center of the c1 tube hole and the center of the c2 tube hole. That is, in the second projection, the centers o1 of any two adjacent tube holes 11c in the array direction F3 of the same fin 11 contain the center o1 of a tube hole 11c in the other fins 11.

[0096] In combination with Figure 5 It can be seen that at this time, the tube holes 11c of each fin 11 are staggered in the array direction F3, and the tube holes 11c of all the fins 11 are arranged compactly, more tube holes 11c are arranged in a unit area, and the heat exchange efficiency of the heat exchanger 100 is better.

[0097] In some embodiments, in the second projection, the center o1 of each orifice 11c is arranged adjacent to the center o1 of the orifice 11c of the adjacent wing 11.

[0098] The wing 11 adjacent to the tube hole 11c refers to the wing 11 that is adjacent to the wing 11 where the tube hole 11c is located.

[0099] Continue with Figure 5 The illustrated embodiments will be described in detail. Figure 5 The middle fin 10 consists of four fins 11, namely, a first fin 111, a second fin 112, a third fin 113, and a fourth fin 114 connected sequentially along the flow direction F1. The first fin 111 has holes 11c, including holes a1 to a5. The second fin 112 has holes 11c, including holes b1 to b5, and five return flow sections m corresponding to the holes a1 to a5. The third fin 113 has holes 11c, including holes c1 to c5, and five return flow sections m corresponding to the holes b1 to b5. The fourth fin 114 does not have holes 11c, but has five return flow sections m corresponding to the holes c1 to c5.

[0100] from Figure 5 As can be seen, the a5 tube hole is adjacent to the b5 tube hole, the b5 tube hole is adjacent to the c5 tube hole, the c5 tube hole is adjacent to the a4 tube hole, the a4 tube hole is adjacent to the b4 tube hole, and so on. That is, the tube holes 11c of the first wing 11 are arranged adjacent to the tube holes 11c of the second wing 11, and the tube holes 11c of the second wing 11 are arranged adjacent to the tube holes 11c of the third wing 11. When there are N wing parts 11, the tube holes 11c of the (N-2)th wing 11 are arranged adjacent to the tube holes 11c of the (N-3)th wing 11 and the tube holes 11c of the (N-1)th wing 11.

[0101] At this time, all the holes 11c on the fin 10 are arranged in a certain direction ( Figure 5 In the middle, the straight line containing the centers of a5, b5, and c5 is parallel to the arrangement direction, forming multiple rows. Figure 4 The fins are arranged in 5 rows, with ai, bi, and ci in one row (i being 1, 2, 3, 4, and 5) in parallel. The fins 10 have a more attractive appearance and make it easier to install the heat exchange tubes 20 on the fins 10.

[0102] In some embodiments, reference is made together with Figure 5 and Figure 4The distance between the centers o1 of any two tube holes 11c adjacent to each other in the array direction F3 of each wing part 11 is a pitch P; each wing part 11 has a column of tube holes 11c arranged along the array direction F3, and the number of arranged columns of tube holes 11c in the fin 10 is denoted as M (M≥2, and M is a positive integer); in the second projection, the distance L between the centers o1 of any two tube holes 11c satisfies L=P / M.

[0103] As shown in Figure 5 , the pitch P is the distance between the centers o1 of two tube holes 11c adjacent to each other in the array direction F3 of each wing part 11. Understandably, the pitch P between any two tube holes 11c adjacent to each other in the array direction F3 is equal.

[0104] The number of arranged columns M refers to the number of columns of tube holes 11c arranged on the fin 10 when there is only one column of tube holes 11c arranged on each wing part 11. In the embodiment shown in Figure 5 , the a1 tube hole to the a5 tube hole form a column of tube holes 11c, the b1 tube hole to the b5 tube hole form a column of tube holes 11c, and the c1 tube hole to the c5 tube hole form a column of tube holes 11c, a total of 3 columns of tube holes 11c. That is, in the embodiment shown in Figure 5 , the number of arranged columns M is equal to 3.

[0105] In the second projection, the distance between the centers o1 of any two tube holes 11c is a distance L, and the distance L is equal to the ratio of the pitch P to the number of arranged columns M. When the pitch P is 9 mm, the distance L is 3 mm. That is, in the second projection, the centers o1 of the tube holes 11c of other wing parts 11 between the centers o1 of two tube holes 11c adjacent to each other in the array direction F3 of a certain wing part 11 are located at the M equidivided points of the distance between the centers o1 of the two tube holes 11c adjacent to each other in the array direction F3 of the certain wing part 11. Taking the embodiment shown in Figure 4 as an example, the center of the c2 tube hole is located at one-third of the distance between the center of the a1 tube hole and the center of the a2 tube hole, and the center of the b2 tube hole is located at two-thirds of the distance between the center of the a1 tube hole and the center of the a2 tube hole.

[0106] In this way, when the tube holes 11c are equidistantly arranged in the array direction F3, the heat exchange efficiency of each heat exchange tube 20 is relatively consistent.

[0107] In some embodiments, the pitch P and the hole diameter Ф of each tube hole 11c satisfy P≥2Ф (unit: mm).

[0108] When the hole spacing P ≥ 2Ф, there must be at least one hole diameter Ф between two adjacent holes 11c. The number of rows of holes 11c on the fin 10 is at least two (i.e., M ≥ 2). When M equals 2 and P ≥ 2Ф, there must be at least one hole diameter Ф between two adjacent holes 11c. In the second projection, this hole diameter Ф interval can accommodate the holes 11c on another fin 11. That is, there will be no overlapping part between two adjacent holes 11c in the second projection, which can improve the heat exchange efficiency of each heat exchange tube 20 sleeved on each hole 11c and avoid being blocked by other heat exchange tubes 20.

[0109] In some embodiments, the number of columns M, the hole spacing P, and the hole diameter Ф satisfy: M≤P / Ф, and are positive integers.

[0110] In the second projection, the tube holes 11c of other wing 11 located between two adjacent tube holes 11c of the same wing 11 are located on the M equal division of the distance between the "two adjacent tube holes 11c of the same wing 11". The distance between the centers o1 of two adjacent tube holes 11c is L = P / M. When M ≤ P / Ф, that is, P ≥ Ф*M, that is, L ≥ Ф, the distance between adjacent tube holes 11c is greater than or equal to the diameter of the tube hole 11c.

[0111] At this time, in the second projection, the distance between two adjacent tube holes 11c is greater than or equal to 0, and there is no intersecting part. That is, any tube hole 11c will not be blocked by other tube holes 11c, and the heat exchange efficiency of each heat exchange tube 20 is high.

[0112] In a preferred embodiment, L = Ф. That is, in the second projection, the distance L between the centers o1 of each two adjacent holes 11c is equal to the aperture Ф of each hole 11c. Thus, in the second projection, each two adjacent holes 11c are tangent to each other, that is, each two adjacent holes 11c do not overlap and are not spaced apart.

[0113] Thus, with the same number of heat exchange tubes 20, the total windward area of ​​all heat exchange tubes 20 is the largest, and the heat exchange efficiency on the windward side of all heat exchange tubes 20 is the best.

[0114] In some embodiments, in the flow direction F1, the distance between adjacent return surfaces M is the distance W, and the distance W and the orifice diameter Ф of each pipe 11c satisfy: W≥1.5Ф.

[0115] like Figure 4 As shown, the distance W between two adjacent return surfaces M in the flow direction F1 refers to the shortest distance between two adjacent return surfaces M in the flow direction F1 in the first projection.

[0116] It is proved that when the distance W between two return flow surfaces M is greater than or equal to 1.5Ф, the air flowing between two adjacent fins 11 encounters less resistance, which helps to reduce the air resistance of the heat exchanger 100.

[0117] In some embodiments, the distance S between the centers of two adjacent tube holes 11c in the flow direction F1 is greater than or equal to 1.5Ф.

[0118] As shown in Figure 6 , the distance S between two adjacent tube holes 11c in the flow direction F1 refers to the shortest distance between two adjacent tube holes 11c in the first projection in the flow direction F1. The two adjacent tube holes 11c in the flow direction F1 are located on two adjacent fins 11.

[0119] It is proved that when the distance S between two return flow surfaces M is greater than or equal to 1.5Ф, the air flowing between two adjacent fins 11 encounters less resistance, which helps to reduce the air resistance of the heat exchanger 100.

[0120] In some embodiments, the thickness of all fins 11 is equal in the flow direction F1.

[0121] The thickness refers to the size in the thickness direction F2. That is, the thickness of the fin 10 is equal in the flow direction F1, and the thickness of each fin 11 is equal in the flow direction F1. At this time, each fin 11 can adopt a plate with the same thickness specification, and the fin 10 can be assembled by plates with the same thickness, so that the manufacturing cost of the fin 10 is low.

[0122] On the other hand, please refer to Figure 6 , Figure 6 for the structural schematic diagram of the heat exchanger 100 provided in some embodiments of the present application. The heat exchanger 100 provided in the embodiments of the present application includes a heat exchange tube 20 and the fin 10 provided in any of the above embodiments, and at least two fins 10 are arranged in the thickness direction F2. All tube holes 11c in all fins 10 having the same projection in the thickness direction F2 are sleeved on the same heat exchange tube 20. The heat exchanger 100 includes all the above beneficial effects, which will not be described here.

[0123] As can be understood, as shown in Figure 7 , all heat exchange tubes 20 are sleeved on each fin 10. The tube holes 11c sleeved on the same heat exchange tube 20 in each fin 10 are coaxially arranged. At this time, adjusting multiple fins 10 corresponding to each heat exchange tube 20 can increase the heat exchange area of the heat exchange tube 20 and improve the heat exchange effect of the heat exchanger 100.

[0124] Figure 6 for the structural schematic diagram of the fin 10 part of the heat exchanger 100 shown in Figure 8 .Figure 7 For Figure 6 Enlarged view at B.

[0125] In some embodiments, referring to Figure 7 and Figure 6 , the size of each reflux surface M in the thickness direction F2 is denoted as K (unit: mm), and the maximum spacing between two adjacent fins 10 is denoted as F (unit: mm). F and K satisfy F≥2K.

[0126] The spacing F between two adjacent fins 10 is the maximum spacing between two adjacent fins 10 in the thickness direction F2. At the overlapping position of the fin portions 11 of two adjacent fins 10, the stepped increment size (i.e., K) of the reflux surface M occupies the space of the spacing F. At this time, the maximum spacing F is not less than 2K, that is, at least one stepped increment size (i.e., K) of the reflux surface M is reserved between the upper and lower fins 10. In this way, the air flow resistance increment can not be greatly increased due to the influence of the design of the reflux surface M, and the power loss caused by the improvement of the heat exchange performance is reduced.

[0127] Optionally, K is 0.1-1 mm, and specifically, K is 0.25 mm, 0.5 mm, or 0.75 mm.

[0128] In further embodiments, referring to Figure 7 and Figure 7 , the maximum size of each fin portion 11 in the thickness direction F2 is equal and is denoted as T (unit: mm), each fin portion 11 has a column of tube holes 11c arranged at intervals along the preset array direction F3, the number of arranged columns of tube holes 11c in the fin 10 is denoted as M (M≥2, and is a positive integer), and (M+1)K=F-T is satisfied.

[0129] When the thicknesses of the fin portions 11 are equal, T is the thickness of each fin portion 11. In the drawings shown in Figure 8 and ​ , K is equal to T, M is 3, and F=T+4K=5K.

[0130] It has been proved that when (M+1)K=F-T is satisfied, the gap between the fins 10 can make the air flow resistance increment not be greatly increased due to the influence of the reflux design, the power loss caused by the improvement of the heat exchange performance is reduced, and large noise caused by large wind resistance is also reduced.

[0131] On the other hand, the present application also provides an air conditioning system, which comprises the heat exchanger 100 described above. Understandably, the air conditioning system also comprises a compressor, a throttling valve, and other components, and the principle and specific structure of the air conditioning system can refer to the prior art. The feature of the air conditioning system provided by the present application is that the heat exchanger 100 provided by the present application is used as a component for heat exchange, such as a condenser or an evaporator, in the air conditioning system.

[0132] Each technical feature of the above-described embodiments can be combined with any other technical feature, and for the sake of brevity, not all possible combinations are described, but it is understood that the scope of the present disclosure encompasses all such possible combinations.

[0133] The above-described embodiments are merely illustrative of several embodiments of the present application, and the description is relatively specific and detailed, but should not be understood as limiting the scope of the patent application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. A fin characterized in that, The fin (10) comprises: at least two fins (11) connected in sequence along a preset flow direction (F1); wherein, in each of two adjacent fins (11), the fin (11) located upstream is configured with at least one pipe hole (11c), each pipe hole (11c) is provided through along the thickness direction (F2) of the fin (10), and the pipe hole (11c) is used for sleeving a heat exchange pipe (20), the fin (11) located downstream has a backflow surface (M) blocking the air flow path, and the backflow surface (M) is arranged opposite to the heat exchange pipe (20) sleeved with the fin (11) located upstream of itself; the tail end (11b) of the fin (11) located downstream in each of two adjacent fins (11) is overlapped on the head end (11a) of the fin (11) located upstream; the tail end (11b) of each fin (11) in each of two adjacent fins (11) is located on the same side of the fin (10) in the thickness direction (F2); the side surface of the fin (11) located downstream towards the fin (11) located upstream of itself is configured as the backflow surface (M).

2. The fin of claim 1, wherein Each backflow surface (M) has at least two backflow sections (m) arranged along a preset array direction (F3), each fin (11) located upstream has at least two pipe holes (11c), and the at least two pipe holes (11c) are arranged at intervals in the array direction (F3), and the array direction (F3), the flow direction (F1) and the thickness direction (F2) are spatially intersected two by two; the at least two backflow sections (m) are arranged opposite to the heat exchange pipe (20) sleeved with the at least two pipe holes (11c) on the fin (11) located upstream of itself one by one, and each backflow section (m) is recessed away from the corresponding pipe hole (11c) in the flow direction (F1).

3. The fin of claim 2, wherein In the orthographic projection of the plane parallel to the flow direction (F1) and the array direction (F3), each backflow section (m) is in the shape of a circular arc.

4. The fin of claim 3, wherein In the orthographic projection of the plane parallel to the flow direction (F1) and the array direction (F3), the center (o1) of each pipe hole (11c) is located on the perpendicular bisector of the corresponding backflow section (m).

5. The fin of claim 4, wherein In the orthographic projection of the plane parallel to the flow direction (F1) and the array direction (F3), the center (o1) of the pipe hole (11c) adjacent to each pipe hole (11c) in the array direction (F3) is located on the circumference of the backflow section (m) corresponding to each pipe hole (11c).

6. The fin of claim 4, wherein In the array direction (F3), the distance between the centers (o1) of any two adjacent pipe holes (11c) is a pitch P; In the orthographic projection of the plane parallel to the flow direction (F1) and the array direction (F3), the distance between the two ends of each backflow section (m) is a chord length C; The chord length C and the pitch P satisfy: C=P (unit: mm).

7. The fin of any one of claims 2-6, wherein, The orthographic projection of the fin (10) in a first plane perpendicular to the thickness direction (F2) is the first projection; the orthographic projection of the first projection in a second plane perpendicular to the drainage direction (F1) is the second projection. In the second projection, the center (o1) of each of the holes (11c) in each of the wings (11) is staggered from the center (o1) of each of the holes (11c) in the other wings (11) in the array direction (F3).

8. The fin of claim 7, wherein In the second projection, each of the wing portions (11) contains the center (o1) of one of the other wing portions (11) between the centers (o1) of two adjacent holes (11c) in the array direction (F3).

9. The fin of claim 8, wherein, In the second projection, the center (o1) of each tube hole is arranged adjacent to the center (o1) of the tube hole (11c) of the adjacent wing (11).

10. The fin of claim 8, wherein The distance between the centers (o1) of any two adjacent holes (11c) of each wing (11) in the array direction (F3) is the hole spacing P (unit mm). Each of the fins (11) has a row of tube holes (11c) arranged along the array direction (F3), and the number of rows of tube holes (11c) in the fins (10) is denoted as M (M≥2 and is a positive integer). In the second projection, the distance L between the centers (o1) of any two of the tube holes (11c) satisfies L=P / M.

11. The fin of claim 10, wherein, The hole spacing P and the hole diameter Ф of each of the tube holes (11c) satisfy: P≥2Ф (unit mm).

12. The fin of claim 11, wherein, The number of columns M, the hole spacing P, and the hole diameter Ф satisfy: M≤P / Ф.

13. The fin of claim 11, wherein, In the flow direction (F1), the distance between adjacent return surfaces (M) is distance W, and the distance W satisfies the following condition with respect to the diameter Ф of each of the pipe holes (11c): W≥1.5Ф.

14. The fin of claim 11, wherein, In the drainage direction (F1), the distance between the centers (o1) of adjacent holes (11c) is a distance S, and the distance S and the diameter Ф of each hole (11c) satisfy: S≥1.5Ф.

15. The fin of claim 1, wherein The thickness of all the fins (11) is equal everywhere in the flow direction (F1).

16. A heat exchanger, characterized by The heat exchanger (100) includes: Heat exchange tube (20); and The fins (10) as described in any one of claims 1-15 are arranged in at least two spaced apart along the thickness direction (F2), and all the tube holes (11c) of all the fins (10) having the same projection along the thickness direction (F2) are fitted onto the same heat exchange tube (20).

17. The heat exchanger of claim 16, wherein The dimension of each of the return surfaces (M) in the thickness direction (F2) is denoted as K (unit mm), and the maximum distance between two adjacent fins (10) is denoted as F (unit mm); F and K satisfy: F≥2K.

18. The heat exchanger of claim 17, wherein, The maximum dimension of each fin (11) in the thickness direction (F2) is equal and is denoted as T (unit: mm), each fin (11) has a column of the tube holes (11c) arranged at intervals along a preset array direction (F3), the number of arranged columns of the tube holes (11c) in the fin (10) is denoted as M (M≥2, and is a positive integer), wherein (M+1)K=F-T.

19. An air conditioning system, characterised in that The air conditioning system comprises the heat exchanger (100) according to any one of claims 16-18.

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