Heat exchanger and gas water heater

Abstract

The utility model relates to the technical field of gas water heaters, and discloses a heat exchanger and a gas water heater, the heat exchanger comprises a heat exchange tube and a heat exchange sheet, the heat exchange tube is provided with a water inlet and a water outlet, the heat exchange tube is bent to form at least two bent spaces, the heat exchange sheet and the at least two bent spaces are arranged in a one-to-one correspondence mode, the heat exchange sheet comprises a plurality of heat exchange fins, and the heat exchange fins are arranged in the bent spaces. The multiple heat exchange fins are arranged at intervals in the length direction of the bending space. Due to the fact that the heat exchange pieces are independently installed in the corresponding bending spaces, when local even large-area carbon deposition and oxidation corrosion occur to the heat exchange pieces in part of the bending spaces, the corresponding heat exchange pieces can be taken out of the bending spaces to be replaced, and the heat exchange pieces in other bending spaces can be continuously used. Therefore, local replacement and maintenance of the heat exchanger are achieved, the whole heat exchanger does not need to be scrapped, material resources and replacement cost are saved, the service life of the heat exchanger is prolonged, meanwhile, the heat exchange pieces do not need to be perforated and penetrated, the manufacturing procedures of the heat exchange pieces are greatly reduced, and after-sales maintenance is convenient.

Description

Technical Field

[0001] This utility model relates to the field of gas water heater technology, specifically to heat exchangers and gas water heaters. Background Technology

[0002] The heat exchanger used in gas water heaters consists of multiple fins that are perforated and welded onto heat exchange tubes. When some fins develop localized or even large-scale carbon buildup and oxidation corrosion, the heat exchanger's heat exchange efficiency will be significantly reduced, resulting in insufficient hot water temperature from the gas water heater and affecting normal use by the user. In this case, the conventional approach is to replace the entire heat exchanger, which results in a huge waste of material resources. Utility Model Content

[0003] In view of this, the present invention provides a heat exchanger and a gas water heater to solve the problem that when some fins of the existing heat exchanger have local or even large-area carbon deposits and oxidation corrosion, the entire heat exchanger must be replaced, resulting in a great waste of material resources.

[0004] The first aspect of this utility model provides a heat exchanger, including a heat exchange tube and heat exchange plates. The heat exchange tube has an inlet and an outlet. The heat exchange tube is bent to form at least two bending spaces. The heat exchange plates are arranged in a one-to-one correspondence with the at least two bending spaces. The heat exchange plates include a plurality of heat exchange fins, which are spaced apart along the length direction of the bending spaces.

[0005] Beneficial effects: The heat exchanger of this application has at least two bending spaces formed by bending the heat exchange tubes. The heat exchange fins are arranged one-to-one in the bending spaces, and the multiple heat exchange fins of the heat exchange fins are spaced apart along the length of the bending space. During heat exchange, cold water flows into the heat exchange tube from the inlet and exchanges heat with the multiple heat exchange fins. The hot water generated by the heat exchange flows out of the heat exchange tube from the outlet. Since the heat exchange fins are independently installed in their respective bending spaces, when some heat exchange fins in some bending spaces experience local or even large-area carbon buildup and oxidation corrosion, the corresponding heat exchange fins can be removed from the bending space and replaced. The heat exchange fins in other bending spaces can continue to be used, thereby realizing partial replacement and maintenance of the heat exchanger without scrapping the entire heat exchanger. This saves material resources, replacement costs, and extends the service life of the heat exchanger. At the same time, the heat exchange fins do not need to be drilled and piped, which greatly reduces the manufacturing process of the heat exchange fins and makes after-sales maintenance convenient.

[0006] In some embodiments, the heat exchange tube includes a first bend and a second bend. At least two first bends are provided, and the at least two first bends are arranged parallel to each other along the length direction of the bend space. The second bend is provided between two adjacent first bends, and the second bend and the first bend form an angle. The bend space is formed between the second bend and the two adjacent first bends.

[0007] Beneficial effects: When the heat exchange tube is bent, a first bend and a second bend are formed. The number of first bends limits the number of bend spaces formed. The second bend connects two adjacent first bends, ensuring the overall structural stability and limiting the width of the bend space.

[0008] In some embodiments, the spacing between any two adjacent first bends is equal.

[0009] Beneficial effects: By making the distance between any two adjacent first bends equal, the resulting bend space is consistent, which improves the heat exchange uniformity of water in the heat exchange tube and avoids uneven heat exchange effect caused by inconsistent bend space.

[0010] In some embodiments, the heat exchange tube is a flat tube, and the thickness h1 of the heat exchange tube is: 10mm≤h1≤20mm.

[0011] Beneficial effects: By setting the thickness h1 of the heat exchange tube to 10mm~20mm, the water and heat exchange plates in the heat exchange tube can have a good heat exchange effect and reach the heat exchange temperature, while also taking into account the water flow rate. This avoids the water in the heat exchange tube not being able to exchange heat to the appropriate temperature due to the thickness h1 of the heat exchange tube being set too large, while the water flow rate will be too small due to the thickness h1 of the heat exchange tube being set too small, which will affect the water output.

[0012] In some embodiments, the height h2 and the thickness h1 of the heat exchange tube satisfy the following relationship:

[0013] Beneficial effects: By setting the height h2 and thickness h1 of the heat exchange tube to a satisfactory value, It balances the heat exchange effect of the heat exchange tube and the water flow rate, avoiding the situation where the water flow in the heat exchange tube is too large due to the excessive heat exchange tube height h2, which prevents the water from reaching the appropriate temperature, while the water flow rate is too small due to the excessive heat exchange tube height h2, which affects the water output.

[0014] In some embodiments, the width L1 and the height h2 of the heat exchange tube satisfy the following relationship:

[0015] Beneficial effects: By setting the width L1 and height h2 of the heat exchange tube to a suitable value, This design establishes a dimensional relationship between the width and height of the heat exchange tubes, preventing a significant difference in size that could negatively impact heat exchange efficiency.

[0016] In some embodiments, the length L2 and the width L1 of the heat exchange tube satisfy the following relationship:

[0017] Beneficial effects: By setting the length L2 and width L1 of the heat exchange tube to meet certain conditions, This design establishes a dimensional relationship between the length and width of the heat exchange tubes, preventing a significant difference in size that could negatively impact heat exchange efficiency.

[0018] In some embodiments, a plurality of heat exchange fins are integrally folded from the heat exchange plates, and adjacent heat exchange fins are connected by a folding portion.

[0019] Beneficial effects: By folding the heat exchange fins into a single piece to form multiple heat exchange fins, the heat exchange fins can be manufactured and formed as a whole, resulting in better overall structure and convenient manufacturing and installation. During installation, the heat exchange fins can be installed as a whole into the bending space, eliminating the need to manufacture and install multiple heat exchange fins one by one, thus improving manufacturing and installation efficiency and making after-sales maintenance more convenient.

[0020] In some embodiments, the spacing between any two adjacent heat exchange fins is equal.

[0021] Beneficial effects: By setting the spacing between any two adjacent heat exchange fins to be equal, multiple heat exchange fins in the bending space are evenly distributed, allowing them to exchange heat evenly with the heat exchange tubes, thus enhancing the heat exchange uniformity of the heat exchanger.

[0022] In some embodiments, the height L3 and width L4 of the heat exchange fins are equal, and the distance L5 between two adjacent heat exchange fins satisfies: L3 = L4 = 10 × L5.

[0023] Beneficial effects: By setting the relationship between the height and width of the heat exchange fins and the spacing between them, the heat exchange fins can achieve the best heat exchange efficiency for the same volume and weight.

[0024] In some embodiments, the heat exchanger further includes a limiting portion connected to the heat exchange tube, the limiting portion being located in the bending space, and the limiting portion being disposed at the bottom of the heat exchange fins.

[0025] Beneficial effects: The limiting part is located at the bottom of the heat exchange fins, which can limit and fix the position of the heat exchange fins, and enhance the connection stability between the heat exchange fins and the heat exchange tubes.

[0026] In some embodiments, the outermost heat exchange fin has a folded edge on the side away from the fold, the folded edge is connected to the heat exchange tube, and the folded edge and the outermost heat exchange fin form an angle.

[0027] Beneficial effects: The folded edge can be connected to the heat exchange tube to enhance the connection strength of the outermost heat exchange fins and reduce the possibility of the outermost heat exchange fins and heat exchange tubes falling off.

[0028] In some embodiments, the side of the folded edge away from the outermost heat exchange fin abuts against the inner heat exchange fin.

[0029] Beneficial effects: By bringing the side of the heat exchange fin furthest from the outermost edge into contact with the heat exchange fin located on the inner side, the outermost heat exchange fin can be prevented from deforming inward due to force during installation. This enhances the overall deformation resistance of the heat exchange tube, reduces deformation during installation, and facilitates the installation of the heat exchange tube.

[0030] A second aspect of this utility model provides a gas water heater, including the heat exchanger of this utility model.

[0031] Beneficial effects: Since the gas water heater of this utility model includes the heat exchanger of this utility model, the gas water heater of this utility model has the same technical effects as the heat exchanger of this utility model. For details, please refer to the description above, which will not be repeated here. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a three-dimensional structural diagram of a heat exchanger according to an embodiment of the present invention;

[0034] Figure 2 This is a top view of a heat exchanger according to an embodiment of the present invention;

[0035] Figure 3 This is a front view of a heat exchanger according to an embodiment of the present invention;

[0036] Figure 4 for Figure 3 Sectional view along the middle AA direction;

[0037] Figure 5 This is an exploded view of the heat exchanger according to one embodiment of the present invention;

[0038] Figure 6 This is a three-dimensional structural diagram of a heat exchanger plate according to an embodiment of the present invention;

[0039] Figure 7 This is a top view of a heat exchange plate according to an embodiment of the present invention;

[0040] Figure 8 This is a front view of a heat exchange plate according to an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures

[0042] 1. Heat exchange tube; 11. First bend; 111. Inlet; 112. Outlet; 113. Flanged edge; 12. Second bend; 13. Bending space; 14. Plug;

[0043] 2. Heat exchange fins; 21. Heat exchange fins; 22. Folded section; 23. Folded edge;

[0044] 3. Limiting part;

[0045] 4. Water inlet pipe; 41. First connecting section;

[0046] 5. Water outlet pipe; 51. Second connecting section. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0048] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "first", "second", "third", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0051] Related technology: In existing heat exchangers, the heat exchange plate 2 has an opening in the middle. Multiple heat exchange plates 2 are sleeved on the outer periphery of the heat exchange tube 1 through the opening and welded to the heat exchange tube 1. When the heat exchange plate 2 located in the middle has local or even large-area carbon deposits and oxidation corrosion, if it is necessary to replace this part of the heat exchange plate 2, other intact heat exchange plates 2 must be removed first. The whole replacement process is complicated and very inconvenient. Therefore, the usual practice is to replace the entire heat exchanger, which results in a great waste of material resources. Based on this, this application proposes a heat exchanger that can facilitate the replacement of heat exchange plate 2 without scrapping the entire heat exchanger.

[0052] The following is combined Figures 1 to 8 The embodiments of this utility model are described in detail below.

[0053] like Figures 1 to 4 As shown, according to an embodiment of the present invention, a heat exchanger is disclosed, including a heat exchange tube 1 and a heat exchange plate 2. The heat exchange tube 1 has an inlet 111 and an outlet 112. The heat exchange tube 1 is bent to form at least two bending spaces 13. The heat exchange plate 2 and the at least two bending spaces 13 are arranged in a one-to-one correspondence. The heat exchange plate 2 includes a plurality of heat exchange fins 21, which are spaced apart along the length direction of the bending spaces 13.

[0054] The heat exchanger of this application has at least two bending spaces 13 formed by bending the heat exchange tube 1. The heat exchange plates 2 are arranged one-to-one in the bending spaces 13. The heat exchange fins 21 of the heat exchange plates 2 are spaced apart along the length of the bending spaces 13. During heat exchange, cold water flows into the heat exchange tube 1 from the inlet 111 and exchanges heat with the heat exchange fins 21. The hot water generated by the heat exchange flows out of the heat exchange tube 1 from the outlet 112. Since the heat exchange plates 2 are independently installed in the corresponding bending spaces 13, when some of the heat exchange plates 2 in the bending spaces 13 have local or even large-area carbon deposits and oxidation corrosion, the corresponding heat exchange plates 2 can be removed from the bending spaces 13 and replaced. The heat exchange plates 2 in other bending spaces 13 can continue to be used, thereby realizing partial replacement and maintenance of the heat exchanger without scrapping the entire heat exchanger, saving material resources, replacement costs and extending the service life of the heat exchanger. At the same time, the heat exchange plates 2 do not need to be drilled and piped, which greatly reduces the manufacturing process of the heat exchange plates 2 and makes after-sales maintenance convenient.

[0055] Meanwhile, compared with the existing straight and spaced heat exchange tubes 1, the present application can reduce the space occupied by the heat exchange tubes 1 in the length direction of the heat exchanger by bending them. By bending, the heat exchange area of ​​the heat exchange tubes 1 is increased, so as to achieve the best heat exchange effect in a limited space.

[0056] This application does not limit the number of heat exchange tubes 1. The number of heat exchange tubes 1 can be set to one or more as needed to achieve heat exchange for different water flow rates and meet different water demand.

[0057] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the heat exchange tube 1 includes a first bend 11 and a second bend 12. At least two first bends 11 are provided, and the at least two first bends 11 are arranged parallel to each other along the width direction of the bend space 13. The second bend 12 is provided between two adjacent first bends 11, and the second bend 12 and the first bend 11 form an angle. The bend space 13 is formed between the second bend 12 and the two adjacent first bends 11.

[0058] When the heat exchange tube 1 is bent, a first bend 11 and a second bend 12 are formed. The number of first bends 11 limits the number of bend spaces 13 formed. The second bend 12 connects two adjacent first bends 11 to ensure the overall structural stability and limits the width of the bend space 13.

[0059] It is understood that each time the heat exchange tube 1 is bent twice, two first bends 11 and one second bend 12 are formed, and a bending space 13 is formed between the two first bends 11 and the one second bend 12. In this embodiment, the heat exchange tube 1 is bent multiple times to form five first bends 11 and four second bends 12. The five first bends 11 and four second bends 12 cooperate to form four bending spaces 13, and a heat exchange plate 2 is correspondingly arranged in each bending space 13. Of course, in other embodiments, the heat exchange tube 1 can be bent to form other numbers of first bends 11 and second bends 12 as needed, and cooperate to form a corresponding number of bending spaces 13, and is not limited to this embodiment.

[0060] Specifically, the heat exchange tube 1 is preferably made of copper or stainless steel with a wall thickness of 0.5mm to 0.8mm to give it better heat transfer performance.

[0061] In some embodiments, the spacing between any two adjacent first bends 11 is equal.

[0062] By making the spacing between any two adjacent first bends 11 equal, the resulting bend spaces 13 are consistent, which improves the uniformity of heat exchange in the heat exchange tube 1 and avoids uneven heat exchange due to inconsistent bend spaces 13.

[0063] To elaborate, the distance between any two adjacent first bends 11 is equal, and the height of the heat exchange tube 1 is constant. In other words, the width, length, and height of each bend space 13 are the same, ensuring that the heat exchange effect is consistent throughout the heat exchange tube 1 and avoiding uneven heat exchange due to different sizes of the bend spaces 13.

[0064] like Figure 4 As shown, in some embodiments, the heat exchange tube 1 is a flat tube, and the thickness h1 of the heat exchange tube 1 is: 10mm≤h1≤20mm.

[0065] By setting the thickness h1 of the heat exchange tube 1 to 10mm~20mm, the water in the heat exchange tube 1 and the heat exchange plate 2 can have a good heat exchange effect and reach the heat exchange temperature. At the same time, the water flow rate can also be taken into account. This avoids the water in the heat exchange tube 1 not being able to exchange heat to the appropriate temperature due to the thickness h1 of the heat exchange tube 1 being too large, while the water flow rate will be too small due to the thickness h1 of the heat exchange tube 1 being too small, which will affect the water output.

[0066] like Figure 4 As shown, it should be noted that the thickness h1 of heat exchange tube 1 refers to the sum of the wall thickness of heat exchange tube 1 and the thickness of the heat exchange cavity inside heat exchange tube 1.

[0067] For example, the thickness h1 of the heat exchange tube 1 can be 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc., and this embodiment does not limit it.

[0068] like Figure 3 and Figure 4 As shown, in some embodiments, the height h2 and thickness h1 of the heat exchange tube 1 satisfy the following relationship:

[0069] By setting the height h2 and thickness h1 of heat exchange tube 1 to satisfy a certain condition, The design balances the heat exchange effect of heat exchange tube 1 with the water flow rate, avoiding the situation where the water flow in heat exchange tube 1 is too large and cannot be heated to the appropriate temperature due to excessive height h2, while the water flow rate is too small and the water output is affected due to insufficient height h2.

[0070] It should be noted that the height h2 of the heat exchange tube 1 and the height of the bending space 13 are related. Therefore, the setting of the height h2 of the heat exchange tube 1 will also affect the height of the bending space 13. The larger the height h2 of the heat exchange tube 1, the larger the height of the bending space 13, and the larger the height of the heat exchange plate 2 can be placed in the bending space 13, which can enhance the heat exchange effect. Conversely, the smaller the height h2 of the heat exchange tube 1, the smaller the height of the resulting bending space 13.

[0071] For example, the height h2 of heat exchange tube 1 can be This embodiment does not limit the scope of the embodiments.

[0072] like Figure 3 and Figure 4 As shown, in some embodiments, the width L1 and height h2 of heat exchange tube 1 satisfy the following relationship:

[0073] By setting the width L1 and height h2 of heat exchange tube 1 to meet the requirements, This design establishes a dimensional relationship between the width and height of heat exchange tube 1, preventing a significant difference in size between the two from affecting heat exchange efficiency.

[0074] The width L1 of the heat exchange tube 1 and the length of the bending space 13 are related. Therefore, the setting of the width L1 of the heat exchange tube 1 will also affect the length of the bending space 13. The larger the width L1 of the heat exchange tube 1, the longer the bending space 13, and the larger the length of the heat exchange plate 2 can be placed in the bending space 13, which can enhance the heat exchange effect. Conversely, the smaller the width L1 of the heat exchange tube 1, the shorter the length of the bending space 13 formed.

[0075] It should be noted here that, as Figure 1 As shown, the length direction of the bent space 13 is consistent with the y-direction.

[0076] like Figure 4 As shown, in some embodiments, the length L2 and width L1 of the heat exchange tube 1 satisfy the following relationship:

[0077] By setting the length L2 and width L1 of heat exchange tube 1 to meet the requirements, This design ensures a dimensional relationship between the length and width of the heat exchange tube 1, preventing a significant difference in size between the two from affecting heat exchange efficiency.

[0078] The length L2 of the heat exchange tube 1, the width of the bending space 13, and the number of bending spaces 13 are related. Therefore, the length L2 of the heat exchange tube 1 will also affect the width and number of bending spaces 13. The larger the length L2 of the heat exchange tube 1, the wider the bending space 13 can be or the more bending spaces 13 can be set. This allows for the placement of a wider heat exchange plate 2 or a greater number of heat exchange plates 2 in the bending space 13, which can enhance the heat exchange effect. Conversely, the smaller the length L2 of the heat exchange tube 1, the smaller the width of the bending space 13 or the fewer bending spaces 13 can be set. This allows for the placement of a narrower heat exchange plate 2 or a smaller number of heat exchange plates 2 in the bending space 13.

[0079] It should be noted here that, as Figure 1 As shown, the width direction of the bent space 13 is consistent with the x-direction.

[0080] This application employs a special design for the thickness h1, height h2, width L1, and length L2 of the heat exchange tube 1. The design of each dimension is related, so that the relevant dimensions of the heat exchange tube 1 are set within a relative range of values, enabling the heat exchange tube 1 to achieve the optimal heat exchange efficiency for the same volume and weight.

[0081] Both ends of the heat exchange tube 1 are sealed by plugs 14 to prevent internal water leakage. In this embodiment, flanges 113 are formed extending outward from the periphery of the inlet 111 and the outlet 112 to facilitate the connection of the inlet 111 and the outlet 112 with external pipelines.

[0082] like Figure 5 and Figure 6 As shown, in some embodiments, multiple heat exchange fins 21 are integrally folded from heat exchange plates 2, and adjacent heat exchange fins 21 are connected by folding portions 22.

[0083] By folding the heat exchange plate 2 into a single piece to form multiple heat exchange fins 21, the multiple heat exchange fins 21 are manufactured as a single piece, resulting in good overall structure and convenient manufacturing and installation. During installation, the heat exchange plate 2 can be installed as a whole into the bending space 13, without the need to manufacture and install multiple heat exchange fins 21 individually, thus improving manufacturing and installation efficiency and making after-sales maintenance more convenient.

[0084] In some embodiments, the spacing between any two adjacent heat exchange fins 21 is equal.

[0085] By setting the spacing between any two adjacent heat exchange fins 21 to be equal, the multiple heat exchange fins 21 in the bending space 13 are evenly distributed, so that they exchange heat evenly with the heat exchange tube 1, thereby enhancing the heat exchange uniformity of the heat exchanger.

[0086] like Figure 7 and Figure 8 As shown, in some embodiments, the height L3 and width L4 of the heat exchange fins 21 are equal, and the distance L5 between two adjacent heat exchange fins 21 satisfies: L3 = L4 = 10 × L5.

[0087] By setting the relationship between the height and width of the heat exchange fins 21 and the spacing between the heat exchange fins 21, the heat exchange fins 2 can achieve the best heat exchange efficiency for the same volume and weight.

[0088] It should be noted that the overall dimensions (length, width, and height) of the heat exchange plate 2 are smaller than the overall dimensions (length, width, and height) of the bending space 13. That is, the heat exchange plate 2 is set inside the bending space 13 without extending beyond the bending space 13, so as to ensure the heat exchange effect of the heat exchange plate 2 and the heat exchange tube 1, while avoiding the heat exchange plate 2 extending out of the bending space 13 and occupying the internal space of the heat exchanger and interfering with the adjacent heat exchange tube 1.

[0089] Specifically, the heat exchange plate 2 is preferably made of copper or steel plate with a thickness of 0.15mm to 0.25mm through folding processing, which takes into account both heat exchange effect and device weight.

[0090] In this embodiment, four heat exchange plates 2 are provided, and the four heat exchange plates 2 and the four bending spaces 13 are provided in a one-to-one correspondence. However, this is not the only embodiment. In other embodiments, the number of heat exchange plates 2 is adjusted according to the number of bending spaces 13. For example, when there are six bending spaces 13, there are six heat exchange plates 2 accordingly.

[0091] like Figure 5 As shown, in some embodiments, the heat exchanger further includes a limiting part 3, which is connected to the heat exchange tube 1. The limiting part 3 is located in the bending space 13 and is disposed at the bottom of the heat exchange fins 21.

[0092] The limiting part 3 is located at the bottom of the heat exchange fin 21, which can limit and fix the position of the heat exchange fin 21, thereby enhancing the connection stability between the heat exchange fin 21 and the heat exchange tube 1.

[0093] Specifically, the limiting part 3 extends into a strip shape along the length of the bending space 13. The strip-shaped limiting part 3 can support the bottom of multiple heat exchange fins 21, improving the limiting stability. Preferably, the length of the limiting part 3 is equal to the length of the heat exchange fin 2, so that the limiting part 3 can stably support the bottom of all heat exchange fins 21.

[0094] In this embodiment, each bending space 13 is provided with two opposing limiting parts 3. The two opposing limiting parts 3 support and limit the two sides of the heat exchange fins 21 respectively, thereby enhancing the installation stability of the two sides of the heat exchange fins 21.

[0095] In this embodiment, the limiting part 3 can be welded to the outer wall of the heat exchange tube 1. The folded portions 22 formed by folding the heat exchange fins 2 are all welded to the outer wall of the heat exchange tube 1, thereby realizing the welding connection between the multiple heat exchange fins 21 and the heat exchange tube 1. When it is necessary to replace the heat exchange fins 2, it is only necessary to desolder the folded portions 22, which facilitates after-sales maintenance and replacement.

[0096] Of course, in other embodiments, the heat exchange plate 2 can also be fixed to the bending space 13 of the heat exchange tube 1 by means of snap-fit ​​or other means. For example, a snap-fit ​​protrusion is provided in the bending space 13, and the heat exchange plate 2 is snap-fitted and fixed by the snap-fit ​​protrusion. When the heat exchange plate 2 needs to be replaced, the heat exchange plate 2 can be pulled out.

[0097] like Figure 6 As shown, in some embodiments, the outermost heat exchange fin 21 has a folded edge 23 on the side away from the folded portion 22. The folded edge 23 is connected to the heat exchange tube 1, and the folded edge 23 and the outermost heat exchange fin 21 form an angle.

[0098] The folded edge 23 can be connected to the heat exchange tube 1 to enhance the connection strength of the outermost heat exchange fin 21 and reduce the possibility of the outermost heat exchange fin 21 and heat exchange tube 1 falling off.

[0099] In some embodiments, the side of the folded edge 23 away from the outermost heat exchange fin 21 abuts against the inner heat exchange fin 21.

[0100] By placing the side of the folded edge 23 away from the outermost heat exchange fin 21 against the inner heat exchange fin 21, the outermost heat exchange fin 21 can be prevented from deforming inward due to force during installation. This enhances the overall deformation resistance of the heat exchange tube 1, reduces deformation during installation, and facilitates the installation of the heat exchange tube 1.

[0101] Specifically, the folded edge 23 is reserved when the heat exchange fin 2 starts to fold and when the folding ends. That is, after determining the gap between adjacent heat exchange fins 21, the width of the folded edge 23 is reserved before bending to form the heat exchange fin 21. After the last heat exchange fin 21 is folded, another folded edge 23 is reserved at the end.

[0102] like Figure 4 and Figure 5 As shown, in addition to the above-described configuration, the heat exchanger in this embodiment also includes an inlet pipe 4 and an outlet pipe 5. The inlet pipe 4 is provided with a first connecting section 41, and the outlet pipe 5 is provided with a second connecting section 51. The inlet pipe 4 is connected to the inlet 111 and the outlet pipe 5 is connected to the outlet 112 via the first connecting section 41 and the flange 113 of the inlet 111, and the outlet pipe 5 is connected to the outlet 112 via the flange 113 of the outlet 112. To enhance sealing, sealing rings can be provided between the first connecting section 41 and the flange 113 of the inlet 111, and between the second connecting section 51 and the flange 113 of the outlet 112.

[0103] A second aspect of this utility model provides a gas water heater, including the heat exchanger of this utility model.

[0104] Since the gas water heater of this utility model includes the heat exchanger of this utility model, the gas water heater of this utility model has the same technical effect as the heat exchanger of this utility model. For details, please refer to the description above. This embodiment will not be repeated here.

[0105] The heat exchanger and gas water heater of this utility model are made by bending the heat exchange tube 1. The fins of multiple heat exchange plates 2 are folded together as a whole. The manufacturing process is simple. When one of the heat exchange plates 2 is carbon deposited and oxidized and corroded, only the damaged heat exchange plate 2 needs to be replaced. There is no need to scrap the entire heat exchanger, which facilitates after-sales maintenance and replacement and saves material resources.

[0106] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A heat exchanger, characterized in that, include: The heat exchange tube (1) has an inlet (111) and an outlet (112), and the heat exchange tube (1) is formed by bending to have at least two bending spaces (13); The heat exchange plate (2) is provided in a one-to-one correspondence with at least two of the bending spaces (13). The heat exchange plate (2) includes a plurality of heat exchange fins (21), which are spaced apart along the length direction of the bending space (13).

2. The heat exchanger according to claim 1, characterized in that, The heat exchange tube (1) includes: The first bending portion (11) is provided in at least two, and the at least two first bending portions (11) are provided parallel to each other along the length direction of the bending space (13); The second bend (12) is disposed between two adjacent first bends (11), and the second bend (12) and the first bend (11) form an angle, and the second bend (12) and the two adjacent first bends (11) form the bending space (13).

3. The heat exchanger according to claim 2, characterized in that, The distance between any two adjacent first bends (11) is equal.

4. The heat exchanger according to any one of claims 1 to 3, characterized in that, The heat exchange tube (1) is a flat tube, and the thickness h1 of the heat exchange tube (1) is: 10mm≤h1≤20mm.

5. The heat exchanger according to claim 4, characterized in that, The height h2 and the thickness h1 of the heat exchange tube (1) satisfy the following:

6. The heat exchanger according to claim 5, characterized in that, The width L1 and the height h2 of the heat exchange tube (1) satisfy the following:

7. The heat exchanger according to claim 6, characterized in that, The length L2 and the width L1 of the heat exchange tube (1) satisfy the following:

8. The heat exchanger according to any one of claims 1 to 3, characterized in that, Multiple heat exchange fins (21) are integrally folded from the heat exchange plate (2), and adjacent heat exchange fins (21) are connected by a folding part (22).

9. The heat exchanger according to claim 8, characterized in that, The spacing between any two adjacent heat exchange fins (21) is equal.

10. The heat exchanger according to claim 9, characterized in that, The height L3 and width L4 of the heat exchange fins (21) are equal, and the distance L5 between two adjacent heat exchange fins (21) satisfies: L3 = L4 = 10 × L5.

11. The heat exchanger according to any one of claims 1 to 3, characterized in that, The heat exchanger also includes a limiting part (3), which is connected to the heat exchange tube (1). The limiting part (3) is located in the bending space (13) and is disposed at the bottom of the heat exchange fins (21).

12. The heat exchanger according to claim 8, characterized in that, The outermost heat exchange fin (21) has a folded edge (23) on the side away from the fold (22), the folded edge (23) is connected to the heat exchange tube (1), and the folded edge (23) and the outermost heat exchange fin (21) form an angle.

13. The heat exchanger according to claim 12, characterized in that, The side of the folded edge (23) away from the outermost heat exchange fin (21) abuts against the inner heat exchange fin (21).

14. A gas water heater, characterized in that, The heat exchanger includes any one of claims 1 to 13.

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