Heat exchanger and heat pump water heater

Abstract

The utility model relates to the technical field of heat exchange, in particular to a heat exchanger and a heat pump water heater. The heat exchanger comprises a plurality of flat pipes and reinforcing ribs, the flat pipes are arranged in parallel at intervals in the width direction of the flat pipes, and each flat pipe comprises a first side face and a second side face which are oppositely arranged in the thickness direction of the flat pipe. The reinforcing ribs extend in the width direction of the flat pipes, are arranged on the sides, in the thickness direction of the flat pipes, of the flat pipes, are made of elastic materials and are provided with bonding faces, and the bonding faces are attached to the first side face or the second side face of any flat pipe and fixedly bonded to the first side face or the second side face of the flat pipe. According to the heat exchanger and the heat pump water heater provided by the invention, the problem that the reinforcing strength is insufficient when the reinforcing ribs and the flat pipes are welded and fixed in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a heat exchanger and a heat pump water heater. Background Art

[0002] At present, the heat exchangers used in heat pump water heaters are mostly parallel flow heat exchangers, wherein when the heat exchanger is assembled on the heat pump water heater, the flat tubes on the heat exchanger are bent to fit with the inner tank of the heat pump water heater. In addition, in order to improve the stability of the flat tubes when they are bent, reinforcing ribs are usually provided on the heat exchanger, and the reinforcing ribs are provided on the same side of the multiple flat tubes and are welded and fixed to the multiple flat tubes.

[0003] However, due to the processing and assembly tolerances of multiple flat tubes, there is a relative deviation in the flatness of the same side of the multiple flat tubes. When the reinforcing ribs are welded to multiple flat tubes at the same time, there may be gaps between the reinforcing ribs and some of the flat tubes, thereby forming a cold weld. When the cold welded flat tube is bent, the bending stability or bending strength of the flat tube cannot be enhanced by the reinforcing ribs. In addition, the welding connection between the reinforcing ribs and the flat tubes may further cause welding deformation of the flat tubes due to weld shrinkage, thermal expansion and contraction, and phase change during the welding process, thereby reducing the bending strength of the flat tubes. Utility Model Content

[0004] Based on this, it is necessary to provide a heat exchanger and a heat pump water heater to solve the problem of insufficient reinforcement strength of the existing reinforcement ribs and flat tubes welded and fixed.

[0005] The present application provides a heat exchanger, which includes a flat tube and a reinforcing rib. There are multiple flat tubes, and the multiple flat tubes are arranged in parallel and spaced apart along their own width direction. The flat tube includes a first side surface and a second side surface that are arranged opposite to each other along their own thickness direction. The reinforcing rib extends along the width direction of the flat tube, and the reinforcing rib is arranged on one side of the flat tube along its own thickness direction. In addition, the reinforcing rib is made of elastic material, and the reinforcing rib has a bonding surface, and the bonding surface is attached to and bonded to the first side surface or the second side surface of any one of the flat tubes.

[0006] In one embodiment, the reinforcing rib is a plastic part, a foam part or a rubber part.

[0007] In one embodiment, the flat tube further includes a third side surface and a fourth side surface arranged relatively to each other along its width direction, and part of the bonding surface is bonded and fixed to the third side surface of at least part of the flat tube; and / or part of the bonding surface is bonded and fixed to the fourth side surface of at least part of the flat tube.

[0008] In one embodiment, the width WP of the reinforcing rib satisfies 30mm≤WP≤60mm.

[0009] In one embodiment, the number of the reinforcing rib is one, and the reinforcing rib is arranged in the middle of the flat tube along its own length direction; wherein, a plurality of the flat tubes are arranged in parallel and spaced apart along their own width direction to form a tube group, and along the width direction of the flat tube, the width W of the tube group, the width WB of the flat tube, and the length W1 of the reinforcing rib satisfy, W-WB≤W1≤W.

[0010] In one embodiment, the number of the reinforcing ribs is two, and the two reinforcing ribs abut against each other in the length direction of the flat tube; wherein, along the length direction of the flat tube, the length L of the flat tube, the distance L1 from one of the reinforcing ribs to the adjacent end of the flat tube, and the distance L2 from the other of the reinforcing ribs to the adjacent end of the flat tube satisfy,

[0011] In one embodiment, a plurality of the flat tubes are arranged in parallel and spaced apart along their width direction to form a tube group. Along the width direction of the flat tubes, the width W of the tube group and the length W1 of any of the reinforcing ribs satisfy: Wherein, any of the flat tubes in the tube group is adhered to and bonded to at least one of the reinforcing ribs.

[0012] In one embodiment, the number of the reinforcing ribs is n (n≥2), and the n reinforcing ribs are arranged at intervals along the length direction of the flat tube; along the length direction of the flat tube, the length L of the flat tube, the spacing L3 between the end of the flat tube and an adjacent reinforcing rib, and the spacing L4 between adjacent reinforcing ribs satisfy:

[0013] In one embodiment, a plurality of the flat tubes are arranged in parallel and spaced apart along their width direction to form a tube group. Along the width direction of the flat tubes, the width W of the tube group and the length W1 of the reinforcing ribs satisfy: Wherein, any of the flat tubes in the tube group is adhered to and bonded to at least one of the reinforcing ribs.

[0014] The present application also provides a heat pump water heater, which includes a water tank and the heat exchanger described in any one of the above embodiments, wherein a plurality of the flat tubes are bent and fitted to the outer wall of the water tank, and the flat tubes are bonded to the outer wall of the water tank through the reinforcing ribs.

[0015] Compared with the prior art, the heat exchanger and heat pump water heater provided by the present application adopts reinforcing ribs made of elastic materials. When the reinforcing ribs are connected to the flat tubes, the reinforcing ribs can rely on their own elastic deformation to achieve adhesion with the flat tubes, avoiding the generation of gaps between the reinforcing ribs and the flat tubes, thereby reducing the adverse effects of the flatness deviation of the flat tubes on the connection of the reinforcing ribs. At the same time, the reinforcing ribs are fixedly connected to the flat tubes by bonding the bonding surface and bonding, which can further improve the reliability of the connection between the reinforcing ribs and the flat tubes. Moreover, compared with the traditional aluminum reinforcing rib welding structure, the reinforcing ribs of the present application can not only avoid welding deformation, but also avoid the occurrence of cold welding, thereby improving the product yield and effectively reducing the manpower and material costs. In this way, when the flat tubes are assembled on the water tank liner of the heat pump water heater, they can better fit with the water tank liner, which is conducive to improving the heat exchange effect and service life of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A front view of the heat exchanger of Example 1 provided in the present application;

[0018] Figure 2 A front view of a heat exchanger according to Embodiment 2 of the present application;

[0019] Figure 3 A front view of the heat exchanger of the third embodiment provided in the present application;

[0020] Figure 4 This is a front view of the heat exchanger of embodiment 4 provided in the present application.

[0021] The symbols in the figure mean the following:

[0022] 100. heat exchanger; 10. tube group; 11. flat tube; 20. reinforcing rib; 30. collecting pipe. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0024] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0028] At present, the heat exchangers used in heat pump water heaters are mostly parallel flow heat exchangers, wherein when the heat exchanger is assembled on the heat pump water heater, the flat tubes on the heat exchanger are bent to fit with the inner tank of the heat pump water heater. In addition, in order to improve the stability of the flat tubes when they are bent, a reinforcing rib is usually provided on the heat exchanger, which is provided on the same side of the multiple flat tubes and is welded and fixed to the multiple flat tubes.

[0029] However, due to the processing and assembly tolerances of multiple flat tubes, there is a relative deviation in the flatness of the same side of the multiple flat tubes. When the reinforcing ribs are welded to multiple flat tubes at the same time, there may be gaps between the reinforcing ribs and some of the flat tubes, thereby forming a cold weld. When the cold welded flat tube is bent, the bending stability or bending strength of the flat tube cannot be enhanced by the reinforcing ribs. In addition, the welding connection between the reinforcing ribs and the flat tubes may further cause welding deformation of the flat tubes due to weld shrinkage, thermal expansion and contraction, and phase change during the welding process, thereby reducing the bending strength of the flat tubes.

[0030] See also Figure 1-Figure 4 In order to solve the problem of insufficient reinforcement strength of the existing reinforcement ribs and flat tubes welded and fixed, the present application provides a heat exchanger 100. The heat exchanger 100 includes a plurality of flat tubes 11 and reinforcement ribs 20. The flat tubes 11 are arranged in parallel and spaced along their own width direction. The flat tubes 11 include a first side surface and a second side surface arranged oppositely along their own thickness direction. The reinforcement rib 20 extends along the width direction of the flat tube 11. The reinforcement rib 20 is arranged on one side of the flat tube 11 along its own thickness direction. Moreover, the reinforcement rib 20 is made of elastic material and has a bonding surface. The bonding surface is attached to and bonded to the first side surface or the second side surface of any flat tube 11.

[0031] The present application adopts a reinforcing rib 20 made of elastic material. When the reinforcing rib 20 is connected to the flat tube 11, the reinforcing rib 20 can rely on its own elastic deformation to achieve adhesion with the flat tube 11, avoiding the generation of a gap between the reinforcing rib 20 and the flat tube 11, thereby reducing the adverse effect of the flatness deviation of the flat tube 11 on the connection of the reinforcing rib 20. At the same time, the reinforcing rib 20 is fixedly connected to the flat tube 11 by the bonding surface and bonding, which can further improve the reliability of the connection between the reinforcing rib 20 and the flat tube 11. Moreover, compared with the structure of welding the traditional aluminum reinforcing rib 20, the reinforcing rib 20 of the present application can not only avoid welding deformation, but also avoid the occurrence of false welding, thereby improving the product yield and effectively reducing the manpower and material costs. In this way, when the flat tube 11 is assembled on the water tank liner of the heat pump water heater, it can better fit with the water tank liner, which is conducive to improving the heat exchange effect and service life of the heat exchanger 100.

[0032] Specifically, in one embodiment, the reinforcing rib 20 is a plastic part, a foam part or a rubber part, so that the reinforcing rib 20 has good elasticity and can improve the performance of the reinforcing rib 20. Preferably, the reinforcing rib 20 can be made of EVA (Ethylene Vinyl Acetate Copolymer) material.

[0033] Furthermore, in one embodiment, the reinforcing rib 20 is arranged in a long strip shape, which has a simple structure and is easy to process.

[0034] In order to ensure the strength of the reinforcing rib 20 and further improve the connection reliability between the reinforcing rib 20 and the flat tube 11, in one embodiment, the width WP of the reinforcing rib 20 satisfies 30mm≤WP≤60mm. If the width of the reinforcing rib 20 is too small, the connection reliability between the reinforcing rib 20 and the flat tube 11 is weak. If the width of the reinforcing rib 20 is too large, the connection between the reinforcing rib 20 and the flat tube 11 is not easy to bend and fit the water tank, which affects the heat exchange efficiency.

[0035] Optionally, the width WP of the reinforcing rib 20 may be 30 mm, 40 mm, 50 mm or 60 mm, etc., which are not listed here one by one.

[0036] In one embodiment, a plurality of flat tubes 11 are arranged in parallel and spaced apart along their width direction to form a tube group 10. The heat exchanger 100 further includes a manifold 30, which is connected to both ends of the tube group 10 in the length direction and communicates with each flat tube 11. The manifold 30 is used to distribute and collect the refrigerant, thereby realizing the circulation of the refrigerant.

[0037] In one embodiment, the flat tube 11 further includes a third side surface and a fourth side surface arranged opposite to each other along its width direction, and a part of the bonding surface is bonded and fixed to the third side surface of at least a part of the flat tube 11, and a part of the bonding surface is bonded and fixed to the fourth side surface of at least a part of the flat tube 11. In this way, the bonding area between the reinforcing rib 20 and the flat tube 11 can be increased, thereby improving the connection strength, which is conducive to further improving the flatness of the flat tube 11.

[0038] Specifically, the two ends of the reinforcing rib 20 in the length direction are preferably bent, and one end extends to the third side of the corresponding flat tube 11 and is bonded and fixed thereto, and the other end extends to the fourth side of another corresponding flat tube 11 and is bonded and fixed thereto, so that the overall connection is more stable and reliable.

[0039] In other embodiments, the reinforcing rib 20 may be bent at only one end so that the bonding surface extends to the third side surface or the fourth side surface of the corresponding flat tube 11 and is bonded and fixed thereto.

[0040] But not limited to this, the reinforcing rib 20 can also partially extend between adjacent flat tubes 11, and be bonded to the third side surface of one of the adjacent flat tubes 11 that is relatively arranged, and the fourth side surface of another flat tube 11, as long as it can be ensured that it can be firmly bonded.

[0041] For ease of explanation, the present application only takes the bonding of the reinforcing rib 20 to the first side surface or the second side surface of the flat tube 11 as an example for explanation.

[0042] Embodiment 1

[0043] In this embodiment, if Figure 1As shown, there is one reinforcing rib 20, and the reinforcing rib 20 is disposed in the middle of the flat tube 11 along its length direction. In this way, the uniformity of the force applied to the flat tube 11 can be improved.

[0044] Furthermore, in one embodiment, along the width direction of the flat tube 11 , the width W of the tube group 10 , the width WB of the flat tube 11 , and the length W1 of the reinforcing rib 20 satisfy W−WB≤W1≤W.

[0045] That is, the reinforcing ribs 20 can extend to the two flat tubes 11 at both ends of the tube group 10 in the width direction, so that all the flat tubes 11 are fixedly connected to the reinforcing ribs 20, thereby satisfying the supporting effect of the reinforcing ribs 20 on the flat tubes 11 and improving the stability of the flat tubes 11 when bending. Preferably, the length of the reinforcing ribs 20 can be set equal to the width of the tube group 10, so that the connection is more stable.

[0046] It should be noted that the reinforcing rib 20 as a whole can be fine-tuned in the width direction of the tube group 10 , but it must be ensured that at least a portion of each flat tube 11 on the tube group 10 can be bonded and fixed to the reinforcing rib 20 .

[0047] Embodiment 2

[0048] In this embodiment, if Figure 2 As shown, there are two reinforcing ribs 20, and the two reinforcing ribs 20 abut against each other in the length direction of the flat tube 11. In the length direction of the flat tube 11, the length L of the flat tube 11, the distance L1 from one reinforcing rib 20 to the adjacent end of the flat tube 11, and the distance L2 from the other reinforcing rib 20 to the adjacent end of the flat tube 11 satisfy,

[0049] In this way, the firmness of the connection between the reinforcing rib 20 and the flat tube 11 can be further improved, while the flexibility of the arrangement of the reinforcing rib 20 is improved and the difficulty of assembling the reinforcing rib 20 is reduced.

[0050] Furthermore, in one embodiment, along the width direction of the flat tube 11, the width W of the tube group 10 and the length W1 of any reinforcing rib 20 satisfy: Among them, any flat tube 11 in the tube group 10 is attached and bonded to at least one reinforcing rib 20. That is, by reasonably setting the length of the reinforcing rib 20, the strength and cost of the reinforcing rib 20 can be taken into account.

[0051] Specifically, when the length of the reinforcing rib 20 is set to be longer, the reinforcing effect of the reinforcing rib 20 on the flat tube 11 can be greatly increased, and the reliability of the reinforcing rib 20 can be improved. By appropriately reducing the length of the reinforcing rib 20, while ensuring that the whole formed by the two reinforcing ribs 20 can achieve the bonding and fixing of all the flat tubes 11 in the tube group 10, the material of the reinforcing rib 20 can be saved while ensuring the connection strength of the reinforcing rib 20, thereby reducing the cost. In addition, the reduction in the length of the reinforcing rib 20 also reduces the difficulty of bonding the reinforcing rib 20, which can effectively improve the overall processing efficiency.

[0052] Preferably, the projection of one of the reinforcing ribs 20 along the length direction of the flat tube 11 at least partially overlaps with another reinforcing rib 20 , so as to further enhance the connection strength of the reinforcing rib 20 and facilitate fixing the flat tube 11 .

[0053] Of course, in other embodiments, the two reinforcing ribs 20 may also be cross-arranged as long as the same effect can be achieved.

[0054] Embodiment 3

[0055] In this embodiment, if Figure 3 As shown, the number of reinforcing ribs 20 is n (n≥2), and the n reinforcing ribs 20 are evenly spaced and arranged along the length direction of the flat tube 11. In this way, the uniformity of the force on the flat tube 11 can be improved. Optionally, the number of reinforcing ribs 20 can be set to two, three, four or more.

[0056] Furthermore, in this embodiment, the width W of the tube group 10 and the length W1 of the reinforcing rib 20 satisfy: Among them, any flat tube 11 in the tube group 10 is attached and bonded to at least one reinforcing rib 20. That is, the length of the reinforcing rib 20 can be reasonably set according to the requirements of strength and cost.

[0057] Specifically, when the length of the reinforcing rib 20 is set to be longer, the reinforcing effect of the reinforcing rib 20 on the flat tube 11 can be greatly increased. By appropriately reducing the length of the reinforcing rib 20, while ensuring that the whole formed by multiple reinforcing ribs 20 can achieve bonding and fixing of all flat tubes 11 in the tube group 10, the material of the reinforcing rib 20 can be saved while ensuring the connection strength of the reinforcing rib 20, thereby reducing costs. In addition, the reduction in the length of the reinforcing rib 20 also reduces the difficulty of bonding the reinforcing rib 20, which can effectively improve the overall processing efficiency.

[0058] Preferably, among two adjacent reinforcing ribs 20 , the projection of one reinforcing rib 20 along the length direction of the flat tube 11 at least partially overlaps with the other reinforcing rib 20 , so as to further enhance the connection strength of the reinforcing rib 20 and facilitate fixing the flat tube 11 .

[0059] Embodiment 4

[0060] In this embodiment, if Figure 4 As shown, the number of the reinforcing ribs 20 is n (n≥2), and the n reinforcing ribs 20 are arranged at intervals along the length direction of the flat tube 11. In this way, the arrangement position of the reinforcing ribs 20 on the flat tube 11 is more flexible, which reduces the difficulty of arranging the reinforcing ribs 20.

[0061] Specifically, along the length direction of the flat tube 11, the length L of the flat tube 11, the distance L3 between the end of the flat tube 11 and an adjacent reinforcing rib 20, and the distance L4 between adjacent reinforcing ribs 20 satisfy: By properly setting the distance between adjacent reinforcing ribs 20 and the distance from the end of the flat tube 11 to the adjacent reinforcing rib 20 , the reinforcing effect of the reinforcing rib 20 on the flat tube 11 in the length direction of the flat tube 11 can be ensured.

[0062] Optionally, the number of the reinforcing ribs 20 may be two, three, four or more.

[0063] Furthermore, along the width direction of the flat tube 11, the width W of the tube group 10 and the length W1 of the reinforcing rib 20 satisfy: Among them, any flat tube 11 in the tube group 10 is attached and bonded to at least one reinforcing rib 20. That is, the length of the reinforcing rib 20 can be reasonably set according to the requirements of strength and cost.

[0064] Specifically, when the length of the reinforcing rib 20 is set to be longer, the reinforcing effect of the reinforcing rib 20 on the flat tube 11 can be greatly increased. By appropriately reducing the length of the reinforcing rib 20, while ensuring that the whole formed by multiple reinforcing ribs 20 can achieve bonding and fixing of all flat tubes 11 in the tube group 10, the material of the reinforcing rib 20 can be saved while ensuring the connection strength of the reinforcing rib 20, thereby reducing costs. In addition, the reduction in the length of the reinforcing rib 20 also reduces the difficulty of bonding the reinforcing rib 20, which can effectively improve the overall processing efficiency.

[0065] Preferably, among two adjacent reinforcing ribs 20 , the projection of one reinforcing rib 20 along the length direction of the flat tube 11 at least partially overlaps with the other reinforcing rib 20 , so as to further enhance the connection strength of the reinforcing rib 20 and facilitate fixing the flat tube 11 .

[0066] The present application also provides a heat pump water heater, which includes a water tank (not shown) and the heat exchanger 100 described in any one of the above embodiments, wherein a plurality of flat tubes 11 are bent and fit to the outer wall of the water tank, and the flat tubes 11 are bonded to the outer wall of the water tank through reinforcing ribs 20, which is beneficial to increase the fit between the flat tubes 11 and the water tank and improve the heat exchange efficiency of the heat pump water heater.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A heat exchanger, characterized in that: The flat tube (11) comprises a plurality of flat tubes (11) and reinforcing ribs (20), wherein the plurality of flat tubes (11) are arranged in parallel and spaced apart along their own width direction, and the flat tube (11) comprises a first side surface and a second side surface which are arranged opposite to each other along their own thickness direction; The reinforcing rib (20) extends along the width direction of the flat tube (11), the reinforcing rib (20) is arranged on one side of the flat tube (11) along its own thickness direction, and the reinforcing rib (20) is made of elastic material, and the reinforcing rib (20) has a bonding surface, and the bonding surface is attached to and bonded to the first side surface or the second side surface of any one of the flat tubes (11).

2. The heat exchanger according to claim 1, characterized in that: The reinforcing rib (20) is a plastic part, a foam part or a rubber part.

3. The heat exchanger according to claim 1, characterized in that: The flat tube (11) further comprises a third side surface and a fourth side surface which are arranged opposite to each other along the width direction thereof, and part of the bonding surface is bonded and fixedly bonded to at least part of the third side surfaces of the flat tube (11); And / or, part of the bonding surface is adhered to and bonded to the fourth side surface of at least a part of the number of the flat tubes (11).

4. The heat exchanger according to claim 1, characterized in that: The width WP of the reinforcing rib (20) satisfies 30mm≤WP≤60mm.

5. The heat exchanger according to any one of claims 1 to 4, characterized in that: The number of the reinforcing rib (20) is one, and the reinforcing rib (20) is arranged at the middle part of the flat tube (11) along its own length direction; Wherein, a plurality of the flat tubes (11) are arranged in parallel and spaced apart along their own width direction to form a tube group (10), and along the width direction of the flat tubes (11), the width W of the tube group (10), the width WB of the flat tubes (11), and the length W1 of the reinforcing ribs (20) satisfy the condition that W-WB≤W1≤W.

6. The heat exchanger according to any one of claims 1 to 4, characterized in that: The number of the reinforcing ribs (20) is two, and the two reinforcing ribs (20) abut against each other in the length direction of the flat tube (11); Wherein, along the length direction of the flat tube (11), the length L of the flat tube (11), the distance L1 from one of the reinforcing ribs (20) to the adjacent end of the flat tube (11), and the distance L2 from the other of the reinforcing ribs (20) to the adjacent end of the flat tube (11) satisfy:

7. The heat exchanger according to claim 6, characterized in that A plurality of the flat tubes (11) are arranged in parallel and spaced apart along their width direction to form a tube group (10); along the width direction of the flat tubes (11), the width W of the tube group (10) and the length W1 of any of the reinforcing ribs (20) satisfy: Wherein, any of the flat tubes (11) in the tube group (10) is adhered to and bonded to at least one of the reinforcing ribs (20).

8. The heat exchanger according to any one of claims 1 to 4, characterized in that: The number of the reinforcing ribs (20) is n (n≥2), and the n reinforcing ribs (20) are arranged at intervals along the length direction of the flat tube (11); Along the length direction of the flat tube (11), the length L of the flat tube (11), the distance L3 between the end of the flat tube (11) and an adjacent reinforcing rib (20), and the distance L4 between adjacent reinforcing ribs (20) satisfy:

9. The heat exchanger according to claim 8, characterized in that A plurality of the flat tubes (11) are arranged in parallel and spaced apart along their width direction to form a tube group (10); along the width direction of the flat tubes (11), the width W of the tube group (10) and the length W1 of the reinforcing ribs (20) satisfy: Wherein, any of the flat tubes (11) in the tube group (10) is adhered to and bonded to at least one of the reinforcing ribs (20).

10. A heat pump water heater, characterized in that: It comprises a water tank and a heat exchanger as claimed in any one of claims 1 to 9, wherein a plurality of the flat tubes (11) are bent and fitted to the outer wall of the water tank, and the flat tubes (11) are bonded to the outer wall of the water tank through the reinforcing ribs (20).

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