Heat exchanger and heating device

Abstract

The utility model belongs to heat exchange technical field discloses a kind of heat exchanger and heating equipment.The heat exchanger includes at least two stacked heat exchange components, the heat exchange component includes heat exchange pipe and fin structure, the heat exchange pipe of adjacent two heat exchange components is communicated;The fin structure is formed by die casting process and is connected with the heat exchange pipe, and the melting point of the fin structure is lower than the melting point of the heat exchange pipe, and the fin structure of each heat exchange component is separately formed.Fin structure is formed by die casting process, and by pre-buried heat exchange pipe in mould, heat exchange pipe is connected with fin structure while forming fin structure, without additional welding fixed fin structure, so that the thermal resistance between fin structure and heat exchange pipe is substantially zero, which is conducive to improving heat exchange efficiency;Fin structure in each heat exchange component is separately formed by die casting process, which can reduce the height of fin formed by single die casting, and is conducive to improving die casting quality.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, and in particular to a heat exchanger and heating equipment. Background Technology

[0002] Currently, heat exchangers used in gas water heaters and gas boilers are typically tube-finned structures. The fins are formed using a stamping process and then assembled and welded to the tube assembly. Due to heat exchange requirements, heat exchangers generally have multiple layers of heat exchange tubes, and each layer of heat exchange tubes requires welded fins for fixation.

[0003] Processing heat exchangers requires stamping the fins first, then welding the fins and tubes together. This involves multiple steps and is a complex process. The mechanical strength of the welded or spliced ​​parts is relatively weak, making them prone to loosening or breaking under high temperature, high pressure, or mechanical vibration. More importantly, this connection method generates significant thermal resistance between the fins and tubes, leading to reduced heat transfer efficiency.

[0004] Existing technologies utilize die casting to form fins, which can solve the problem of high thermal resistance caused by welding. However, the fins of multi-layer heat exchange tubes are large in size and relatively thin in thickness, resulting in poor die casting quality and making them difficult to apply in practice. Utility Model Content

[0005] The purpose of this utility model is to provide a heat exchanger and heating equipment that can solve the problems of complex processing procedures, high thermal resistance at welding positions, and poor fin die-casting quality.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A heat exchanger includes at least two stacked heat exchange components, the heat exchange components comprising:

[0008] Heat exchange tubes, wherein the heat exchange tubes of two adjacent heat exchange assemblies are connected;

[0009] The fin structure is formed by die casting and connected to the heat exchange tube. The melting point of the fin structure is lower than that of the heat exchange tube. The fin structure of each heat exchange component is formed separately.

[0010] As an alternative to the aforementioned heat exchanger, the fin structures of two adjacent heat exchange components are spaced apart or connected.

[0011] As an alternative to the above-mentioned heat exchanger, the fin structures of two adjacent heat exchange components are welded and fixed, or the fin structures of two adjacent heat exchange components are slidably assembled and connected.

[0012] As an alternative to the aforementioned heat exchanger, one of the top and bottom ends of the fin structure is provided with an insertion part, and the other is provided with an insertion groove. The insertion groove is a through groove, and the insertion part can be slidably assembled with the insertion groove.

[0013] As an alternative to the aforementioned heat exchanger, one end of the insertion portion is provided with a baffle, which can abut against the end face of the insertion slot of the adjacent heat exchange component.

[0014] As an alternative to the above-mentioned heat exchanger, the heat exchanger further includes two end plates arranged opposite each other, and each heat exchange component is connected to the end plates;

[0015] And / or, the fin structure is made of aluminum alloy, and the heat exchange tube is made of copper or stainless steel.

[0016] As an alternative to the above-mentioned heat exchanger, the fin structure includes a heat-conducting layer and fins, the heat-conducting layer covers at least a portion of the outer wall of the heat exchange tube, and the fins are connected to the heat-conducting layer;

[0017] Alternatively, the fin structure includes multiple fins, the outer wall of the heat exchange tube is provided with a fixing groove, and one end of the fin is located in the fixing groove.

[0018] As an alternative to the above-mentioned heat exchanger, the thickness of the heat-conducting layer is greater than or equal to the wall thickness of the heat exchange tube;

[0019] And / or, the thickness of the heat-conducting layer is 1-2 times the wall thickness of the heat exchange tube;

[0020] And / or, the thickness of the thermally conductive layer is 1-3 mm;

[0021] And / or, the wall thickness of the heat exchange tube is 1-1.5 mm;

[0022] And / or, the outer wall of the heat exchange tube is provided with protrusions or pits.

[0023] As an alternative to the above-mentioned heat exchanger, the fin structure includes fins, and the fins are flat plate structures;

[0024] Alternatively, the fins may include:

[0025] Finned plates;

[0026] A protrusion is provided on at least one side of the fin plate.

[0027] A heating device comprising the heat exchanger described above.

[0028] The beneficial effects of this utility model are:

[0029] In the heat exchanger provided by this utility model, the fin structure is formed by die casting, and the heat exchange tube is pre-embedded in the mold. The heat exchange tube is connected to the fin structure at the same time as the fin structure is formed. The process is simple and does not require additional welding to fix the fin structure. This makes the thermal resistance between the fin structure and the heat exchange tube almost zero, which is conducive to improving heat exchange efficiency. The heat exchange tube and the fin structure can be made of different materials, which allows for more flexible material selection and helps to control costs and reduce weight.

[0030] The heat exchanger includes at least two heat exchange components stacked together to meet heat exchange requirements; the fin structure in each heat exchange component is individually formed by die casting, which can reduce the height of the fins formed in a single die casting and improve the quality of die casting.

[0031] The heating device provided by this utility model uses the above-mentioned heat exchanger, which has good heat exchange effect, low cost and light weight. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the heat exchanger provided in Embodiment 1 of this utility model;

[0033] Figure 2 This is a schematic diagram of the heat exchange tube provided in Embodiment 1 of this utility model;

[0034] Figure 3 This is a first structural schematic diagram of a portion of the heat exchanger provided in Embodiment 1 of this utility model;

[0035] Figure 4 This is a second structural schematic diagram of a portion of the heat exchanger provided in Embodiment 1 of this utility model;

[0036] Figure 5 This is a partial structural schematic diagram of the fin structure provided in Embodiment 1 of this utility model;

[0037] Figure 6 This is a schematic diagram of the structure of the first type of fin provided in Embodiment 2 of this utility model;

[0038] Figure 7 This is a schematic diagram of the structure of the second type of fin provided in Embodiment 2 of this utility model;

[0039] Figure 8 This is a schematic diagram of the structure of the third type of fin provided in Embodiment 2 of this utility model;

[0040] Figure 9 This is a schematic diagram of the structure of the fourth type of fin provided in Embodiment 2 of this utility model;

[0041] Figure 10 This is a schematic diagram of the fin structure provided in Embodiment 3 of this utility model;

[0042] Figure 11 This is a schematic diagram of the structure of the first type of heat exchange tube and fins provided in Embodiment 4 of this utility model;

[0043] Figure 12 This is a schematic diagram of the structure of the second type of heat exchange tube and fins provided in Embodiment 4 of this utility model;

[0044] Figure 13 This is a schematic diagram of the third type of heat exchange tube and fins provided in Embodiment 4 of this utility model;

[0045] Figure 14 This is a cross-sectional view of the first type of heat exchanger structure provided in Embodiment 5 of this utility model;

[0046] Figure 15 This is a cross-sectional view of the second heat exchanger structure provided in Embodiment 5 of this utility model.

[0047] In the picture:

[0048] 10. End plate; 20. Heat exchange tube; 21. Tube assembly; 211. Straight tube; 22. Bend; 30. Fin structure; 31. Fin; 311. Fin plate; 312. Protrusion; 313. Insertion part; 314. Insertion groove; 315. Baffle; 316. Rib; 32. Heat-conducting layer; 32a. First heat-conducting tube; 32b. Second heat-conducting tube. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0050] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0053] Example 1

[0054] This embodiment provides a heating device, which includes a burner and a heat exchanger. The burner generates heat when it burns, and the heat exchanger absorbs the heat generated by the burner to heat the water passing through the heat exchanger, thereby providing hot water to the user.

[0055] In this embodiment, the heating device can be a gas water heater. In other embodiments, the heating device can also be a gas boiler, or other devices including a heat exchanger; this is not a limitation.

[0056] like Figure 1 As shown, the heat exchanger includes two end plates 10 arranged opposite each other and at least two stacked heat exchange components connected to the end plates 10. By providing at least two heat exchange components, the heat exchange efficiency of the heat exchanger can be improved to meet usage requirements.

[0057] In some embodiments, the heat exchange assembly includes a heat exchange tube 20 and a finned structure 30. The heat exchange tube 20 is connected to the end plate 10, and a heat exchange channel is formed inside the heat exchange tube 20. The finned structure 30 is connected to the heat exchange tube 20 to increase the heat exchange area. Taking the heat exchanger used in a gas water heater as an example, the heat exchange channel is connected to the inlet and outlet pipes of the gas water heater. After water enters the heat exchange channel, it absorbs the heat generated by the burner through the heat exchange tube 20 and the finned structure 30, thereby heating the water in the heat exchange channel to provide hot water to the user.

[0058] In some embodiments, the fin structure 30 includes fins 31, which are generally plate-shaped structures with a large area, which is beneficial for increasing the heat exchange area and improving the heat exchange effect.

[0059] In the existing technology, the fin structure is formed by stamping and then fixed to the heat exchange tube by welding. This process is not only complicated, but the mechanical strength of the welded position is also low. It is easy to loosen or break under high temperature, high pressure or mechanical vibration. In addition, the welded position will generate a large thermal resistance, resulting in a reduction in heat transfer efficiency.

[0060] To address the aforementioned issues, in this embodiment, the fin structure 30 is formed using a die-casting process and connected to the heat exchange tube 20, with each fin structure 30 in each heat exchange assembly being formed individually. This arrangement eliminates the need for welding, thereby improving connection strength, avoiding significant thermal resistance at welding points, and ultimately enhancing heat transfer efficiency. The individual forming of each fin structure 30 reduces the height of the fins 31 formed each time, improving the flowability of the molding solution within the mold cavity and ensuring molding quality.

[0061] In addition, the heat exchange tubes 20 and fin structures 30 in each heat exchange component are connected separately by die casting, which helps to improve the modularity of the heat exchange components and makes it convenient to select the number of heat exchange components in the heat exchanger according to actual needs. It does not require the preparation of corresponding molds for heat exchangers with different layers, which helps to reduce production costs and facilitates mass production.

[0062] It is understandable that the heat exchange tube 20 is pre-embedded in the mold and fixed before the fin structure 30 is die-cast. During the die-casting process, the casting material cools in the mold cavity and then connects with the heat exchange tube 20 as a whole, without the need for additional welding. Moreover, the connection between the fin structure 30 and the heat exchange tube 20 is tight, with low thermal resistance, and heat can be smoothly transferred between the fin structure 30 and the heat exchange tube 20, which is beneficial to improving heat exchange efficiency.

[0063] In the existing technology, fins are generally made of copper. Copper is relatively expensive and has a high density, which not only makes it difficult to control costs, but also increases the weight of the heat exchanger.

[0064] To solve the above problems, the heat exchange tube 20 is pre-embedded and the fin structure 30 is formed by die casting. The heat exchange tube 20 and the fin structure 30 can be made of different materials, which is conducive to reasonable cost control.

[0065] To improve the heat exchange effect between the fin structure 30 and the flue gas, the fin structure 30 is made of a thermally conductive material, which makes the formed fin structure 30 have good thermal conductivity and is conducive to improving heat exchange efficiency.

[0066] To prevent damage or deformation of the heat exchange tube 20 during the die casting process, the melting point of the fin structure 30 is lower than that of the heat exchange tube 20. This ensures that the temperature of the liquid material being cast is lower than the melting point of the heat exchange tube 20 during the die casting process, preventing the heat exchange tube 20 from deforming or melting in a high-temperature environment and thus guaranteeing processing quality.

[0067] For example, the finned structure 30 is made of aluminum alloy, and the heat exchange tube 20 is made of copper. The melting point of aluminum alloy is approximately 660°C, and the melting point of copper is approximately 1083°C. When the aluminum alloy solution is poured into the mold, the heat exchange tube 20 can withstand the temperature of the aluminum alloy solution without melting because the melting point of aluminum alloy is much lower than that of copper, thus preventing damage to the heat exchange tube 20. Aluminum alloy has good thermal conductivity, low cost, and light weight. Using aluminum alloy to make the finned structure 30 and copper to make the heat exchange tube 20 can reduce the amount of copper used while ensuring good heat exchange performance between the water in the heat exchange channel and the heat exchange tube 20, and between the finned structure 30 and the flue gas. This reduces costs and the weight of the heat exchanger, which is beneficial to improving product competitiveness.

[0068] In some other embodiments, the fin structure 30 is made of aluminum alloy and the heat exchange tube 20 is made of stainless steel, which can reduce costs and weight while ensuring heat transfer efficiency.

[0069] In some other embodiments, the heat exchange tube 20 and the fin structure 30 may also be made of other materials.

[0070] To improve the heating rate of water, in some embodiments, the heat exchange tube 20 is bent so as to extend the length of the heat exchange tube 20 without increasing the overall size of the heat exchanger, thereby extending the flow path of water in the heat exchange channel and ensuring that the water is fully heated in the heat exchange channel.

[0071] In some embodiments, such as Figure 2 As shown, the heat exchange tube 20 includes a tube assembly 21 and a bend 22. The tube assembly 21 includes multiple straight tubes 211, the ends of which are connected sequentially through the bend 22, so that the multiple straight tubes 211 are connected in series through the bend 22. Through the cooperation of the straight tubes 211 and the bend 22, the heat exchange channel is a series of U-shaped channels connected in sequence. This can increase the contact area between the fin structure 30 on the heat exchange tube 20 and the flue gas by extending the water flow path, thereby achieving the purpose of sufficient heat exchange.

[0072] For example, the straight tube 211 extends along the second direction Y, and the multiple straight tubes 211 in the tube group 21 are arranged side by side and spaced apart along the first direction X, so that the multiple straight tubes 211 are arranged in a layer, which helps to reduce the height of the heat exchange tube 20, thereby helping to reduce the height of the fin structure 30 and helping to ensure the quality of die casting.

[0073] When forming the heat exchange assembly, the straight tubes 211 and the bent tubes 22 in the heat exchange tube 20 can be welded and fixed first, and then the heat exchange tube 20 can be pre-embedded in the mold to form the fin structure 30; or multiple straight tubes 211 in the heat exchange tube 20 can be pre-embedded in the mold and fixed first to ensure the spacing between two adjacent straight tubes 211; then the die casting process is carried out to form the fin structure 30; finally, the bent tubes 22 and the straight tubes 211 are welded and fixed to form the heat exchange assembly.

[0074] When assembling the heat exchanger, the heat exchange tubes 20 in two adjacent heat exchange components can be connected by a connecting pipe. The connecting pipe can be bent to ensure that the two heat exchange components can be stacked.

[0075] In some embodiments, the fin structures 30 in two adjacent heat exchange components are spaced apart to improve the tolerance for errors in the size and installation position of the fin structures 30, and also to increase the gap between the heat exchange components to facilitate flue gas flow.

[0076] In some other embodiments, such as Figure 3 and Figure 4 As shown, the fin structures 30 in two adjacent heat exchange components are connected to improve the stability of the overall structure, which is beneficial to the heat transfer between adjacent heat exchange components. It is also beneficial to increase the number of layers of heat exchange components without increasing the overall size of the heat exchanger, so as to improve the heat exchange effect.

[0077] In some embodiments, the fins 31 in two adjacent heat exchange components are welded together, which helps to improve the connection strength and overall stability.

[0078] In some other embodiments, adjacent heat exchange components are slidably assembled to reduce positioning and assembly difficulty.

[0079] For example, such as Figure 3 As shown, at least one of the top and bottom ends of the fin structure 30 has an insertion portion 313, and the other has an insertion groove 314. The insertion groove 314 extends along the extension direction of the fin 31 and is a through groove with at least one open end. When it is necessary to assemble two adjacent heat exchange components, the insertion portion 313 in one heat exchange component is aligned with the opening of the insertion groove 314 in the other heat exchange component. Then, the heat exchange component is pushed along the extension direction of the fin 31, so that the insertion portion 313 slides into the insertion groove 314, completing the assembly of the two heat exchange components. This structure simplifies the assembly between adjacent heat exchange components and facilitates operation. Furthermore, the cooperation between the insertion portion 313 and the insertion groove 314 improves the stability of the stacked arrangement of two adjacent heat exchange components, resulting in a compact structure.

[0080] In some embodiments, such as Figure 4As shown, a baffle 315 is provided at one end of the plug-in part 313. After the plug-in part 313 slides into place along the plug-in groove 314, the baffle 315 abuts against the end of the plug-in groove 314 of another heat exchange component, thereby realizing the positioning of the heat exchange component and improving the fitting accuracy of the two adjacent heat exchange components.

[0081] In some embodiments, the thickness of the fin 31 with the insertion portion 313 and the insertion groove 314 is greater than other thicknesses, so as to ensure the thickness of the insertion portion 313 and the width of the insertion groove 314, thereby improving the strength of the insertion mating joint.

[0082] In some embodiments, in the fin structure 30, the fins 31 located at both ends along the first direction X are respectively formed with insertion portions 313 and insertion slots 314 to improve the stability of two adjacent heat exchange components. In other embodiments, the number and position of the fins 31 provided with insertion portions 313 and insertion slots 314 can be set according to actual needs.

[0083] For example, there are two heat exchange components. The tube group 21 in the lower heat exchange component includes two straight pipes 211, one end of which is connected by a bend 22. The other end of one straight pipe 211 serves as the water inlet / outlet, and the other end of the other straight pipe 211 is connected to the upper tube group 21 via the bend 22. The tube group 21 in the upper heat exchange component includes three straight pipes 211, which are connected sequentially by two bends 22. One of the three straight pipes 211 is connected to the lower tube group 21, and the other serves as the water inlet / outlet.

[0084] In some other embodiments, the number of straight pipes 211 in the pipe group 21 may be the same; the number of pipe groups 21 may be set according to actual needs.

[0085] In some embodiments, such as Figure 5 As shown, the fin 31 includes a fin plate 311 and a protrusion disposed on at least one side surface of the fin plate 311. The protrusion can increase the surface area of ​​the fin 31, which is beneficial to improving the heat exchange effect.

[0086] In some embodiments, such as Figure 5 As shown, the protrusion is a stiffener 316, which is set at an angle to the fin plate 311.

[0087] For example, the included angle between the stiffener 316 and the fin plate 311 can be a right angle or an acute angle, and the specific included angle can be set according to actual needs.

[0088] It is understandable that when the fin structure 30 is die-cast, the mold has a cavity for forming each fin plate 311. Since the fin plate 311 is a flat plate structure, the cavity size is small, the fluidity of the die-casting solution is poor, and the molding quality is affected.

[0089] To address the aforementioned issues, in some embodiments, at least a portion of the protrusion is connected to adjacent fins 31. That is, at least a portion of the ribs 316 are connected to adjacent fins 31; this connection could be between the ribs 316 and adjacent fin plates 311, or between the ribs 316 within adjacent fins 31. This arrangement allows the cavity of the forming rib 316 to connect with the cavities of two adjacent forming fins 31, which improves the fluidity of the casting solution and thus enhances the molding quality.

[0090] In some embodiments, the fin plate 311 extends along a first direction X, and multiple fin plates 311 are arranged at intervals along a second direction Y; multiple stiffeners 316 are provided on opposite sides of each fin plate 311, and each stiffener 316 extends from one end to the other end along the height direction of the fin plate 311 to increase the surface area of ​​the stiffener 316; multiple stiffeners 316 are arranged at intervals along the first direction X.

[0091] In some embodiments, the stiffeners 316 on opposite sides of the same fin plate 311 are arranged facing each other, and the stiffeners 316 on two adjacent fins 31 are also arranged facing each other, with the opposing stiffeners 316 connected between adjacent fins 31. This arrangement makes the multiple fins 31 form a grid structure, and the multiple sequentially connected stiffeners 316 form a plate-like structure that intersects with the fin plates 311, which helps to increase the heat exchange area. Furthermore, two adjacent fin plates 311 and the stiffeners 316 between them enclose multiple air passage chambers, through which flue gas can pass, which helps to improve the flowability of the flue gas.

[0092] For example, the fin 31 can be a rectangular plate or a rhomboid plate, or other irregular shapes. The specific shape of the fin 31 is not limited here.

[0093] In some embodiments, the two ends of the straight tube 211 are connected to the end plate 10, and the two ends of the straight tube 211 pass through the corresponding end plate 10 to extend out of the outside of the end plate 10. The bent tube 22 is located outside the end plate 10 to connect multiple straight tubes 211 in sequence. Correspondingly, the fin 31 is disposed on the straight tube 211 and is located between two end plates 10.

[0094] In some embodiments, the bend 22 is welded to the straight pipe 211 to ensure sealing performance.

[0095] In some embodiments, to improve the connection strength between the fins 31 and the heat exchange tube 20, a fixing groove is provided on the outer wall of the heat exchange tube 20, and one end of the fins 31 is located in the fixing groove. Specifically, when the heat exchange tube 20 is pre-embedded in the mold, the fixing groove on the heat exchange tube 20 is connected to the cavity of the formed fins 31, so that one end of the formed fins 31 is located in the fixing groove. This increases the contact area between the fins 31 and the heat exchange tube 20, thereby increasing the connection strength between the heat exchange tube 20 and the fins 31 and reducing the probability of connection failure due to mechanical vibration or high temperature.

[0096] Example 2

[0097] This embodiment provides a heating device, which has a structure that is roughly the same as the heating device in Embodiment 1, except that the fin structure 30 has a different structure from that in Embodiment 1.

[0098] like Figure 6 As shown, the protrusion is a protrusion 312 provided on at least one side surface of the fin plate 311. The protrusion 312 can increase the surface area of ​​the fin 31 to increase the heat exchange area, which is beneficial to improving the heat exchange effect.

[0099] In some embodiments, protrusions 312 are provided on both opposite sides of the finned plate 311 to further increase the heat exchange area. Optionally, each side surface of the finned plate 311 is provided with a plurality of protrusions 312, which are distributed in an array.

[0100] In some embodiments, the protrusions 312 on the opposite two sides of the finned plate 311 can be as follows: Figure 6 The setup shown is the one facing the center, or it can be set as follows: Figure 7 The settings are staggered as shown.

[0101] In some embodiments, the protrusions 312 on two adjacent fins 31 can be as follows: Figure 8 The setup shown is the one facing the center, or it can be set as follows: Figure 9 The settings are staggered as shown.

[0102] In some embodiments, the protrusion 312 can be as follows: Figure 6 The shape shown is hemispherical, but it can also be like... Figure 7 and Figure 8 The figure shown is a prism, for example, with a rectangular or trapezoidal cross-section. The shape of the protrusion 312 is not specifically limited.

[0103] In some embodiments, such as Figures 6-8 As shown, adjacent fins 31 are spaced apart, meaning that the protrusions 312 on one fin 31 are spaced apart from the protrusions 312 on the other fin 31. This arrangement helps to increase the gap between adjacent fins 31, facilitating the passage of flue gas.

[0104] In some other embodiments, such as Figure 9As shown, at least a portion of the protrusions 312 are connected to adjacent fins 31. Exemplarily, at least a portion of the protrusions 312 are connected to adjacent fin plates 311, or two opposing protrusions 312 are connected. This arrangement, on the one hand, allows two adjacent fins 31 to be integrally formed by die casting, with the corresponding cavities of the two adjacent fins 31 connected, which helps improve the fluidity of the die casting liquid, thereby improving the molding quality; on the other hand, without changing the size of the protrusions 312, the structure of the fin structure 30 is made more compact, which helps increase the number of fins 31, thereby increasing the heat exchange area.

[0105] It should be noted that when protrusions 312 are provided on both sides of the fin 31, and the protrusions 312 on both sides of the same fin 31 are facing each other, and the protrusions 312 on two adjacent fins 31 are facing each other, multiple fins 31 form a grid structure. For details, please refer to the fin structure 30 in Embodiment 1.

[0106] Example 3

[0107] This embodiment provides a heating device, which has a structure that is roughly the same as the heating device in Embodiment 1, except that the fin structure 30 has a different structure from that in Embodiment 1.

[0108] like Figure 10 As shown, in some embodiments, the fin structure 30 includes a plurality of fins 31 arranged parallel to and spaced apart along the extension direction of the straight tube 211. The straight tube 211 passes through the plurality of fins 31 in sequence to increase the contact area between the fins 31 and the straight tube 211, which not only helps to improve the heat exchange effect, but also helps to improve the connection strength between the fins 31 and the straight tube 211. This type of fin structure is simple, easy to process, and has a large space between adjacent fins 31, which facilitates the flow of flue gas.

[0109] Example 4

[0110] This embodiment provides a heating device, which is a further improvement on the basis of Embodiment 1, Embodiment 2 or Embodiment 3, and is conducive to the smooth passage of flue gas through the heat exchanger.

[0111] To ensure the flowability of the flue gas, in some embodiments, such as Figure 11 As shown, the straight pipes 211 in two adjacent pipe groups 21 are staggered so that the flue gas can come into contact with the straight pipes 211 in each layer of pipe group 21 during the flow process, thereby improving the heat exchange effect.

[0112] To ensure the flowability of flue gas, the straight pipes 211 within the same pipe group 21 are arranged along the first direction X, and the distance H between two adjacent straight pipes 211 within the same pipe group 21 is greater than the maximum dimension of the straight pipe 211 along the first direction. This arrangement ensures that the vertical projection of the upper layer of straight pipes 211 is tangent to or spaced apart from the vertical projection of the lower layer of straight pipes 211, which helps to ensure the flowability of flue gas.

[0113] For example, such as Figure 11 As shown, straight pipe 211 is a circular pipe, and the distance H between two adjacent straight pipes 211 is greater than or equal to the diameter D1 of the straight pipe 211; as Figure 12 As shown, the straight tube 211 is an elliptical tube, and its minor axis extends along the first direction X. Therefore, the distance H between two adjacent straight tubes 211 is greater than or equal to the diameter D2 along the minor axis of the straight tube 211. Figure 13 As shown, the straight tube 211 is an elliptical tube, and the major axis of the straight tube 211 extends along the first direction X. Then the distance H between two adjacent straight tubes 211 is greater than or equal to the diameter D3 of the straight tube 211 along the major axis direction.

[0114] In some other embodiments, the shape of the straight tube 211 can be set as needed, such as a square tube, which is not limited here.

[0115] Example 5

[0116] This embodiment provides a heating device that is further improved based on Embodiment 1, Embodiment 2 or Embodiment 3 to increase heat exchange uniformity and improve the corrosion resistance of the heat exchanger.

[0117] In this embodiment, as Figure 14 and Figure 15 As shown, the fin structure 30 includes fins 31 and a heat-conducting layer 32. The heat-conducting layer 32 covers at least a portion of the outer wall of the heat exchange tube 20, and the fins 31 are connected to the heat-conducting layer 32. By providing the heat-conducting layer 32, on the one hand, the contact area between the fin structure 30 and the heat exchange tube 20 can be increased, which not only helps to improve the connection strength, but also protects the heat exchange tube 20 and improves the uniformity of heat transfer. This helps to reduce the corrosion of the heat exchange tube 20 by flue gas, improve the uniformity of water heating in the heat exchange channel, and enhance product competitiveness. On the other hand, by providing the heat-conducting layer 32, the wall thickness of the heat exchange tube 20 can be reduced, thereby reducing costs.

[0118] In some embodiments, such as Figure 14 As shown, the heat-conducting layer 32 is a heat-conducting pipe, which is sleeved on at least part of the straight pipe 211 and / or at least part of the bent pipe 22 to improve the connection strength between the fin structure 30 and the heat exchange pipe 20 and increase the heat exchange area.

[0119] In some embodiments, such as Figure 14As shown, the heat pipe is sleeved outside the straight pipe 211 to improve the strength of the straight pipe 211 and satisfy the support effect of the straight pipe 211 on the fins 31.

[0120] In some other embodiments, such as Figure 15 As shown, the heat-conducting layer 32 includes a first heat-conducting pipe 32a and a second heat-conducting pipe 32b connected to each other. The first heat-conducting pipe 32a is sleeved outside the straight pipe 211, and the second heat-conducting pipe 32b is sleeved outside the bend pipe 22. That is, the heat-conducting layer 32 completely covers the heat exchange pipe 20, which can not only improve the strength of the straight pipe 211, but also improve the strength of the bend pipe 22, reduce the problem of freezing and cracking of the bend pipe 22, and also prevent the bend pipe 22 from corroding.

[0121] Furthermore, due to the arrangement of the first heat pipe 32a and the second heat pipe 32b, the wall thickness of the straight pipe 211 and the bent pipe 22 can be reduced accordingly to reduce the amount of copper or stainless steel used, thereby reducing costs.

[0122] In some other embodiments, only a portion of the straight pipe 211 or a portion of the bent pipe 22 may be fitted with a heat-conducting pipe.

[0123] In some embodiments, the thickness of the heat-conducting layer 32 is greater than or equal to the wall thickness of the heat exchange tube 20, so as to reduce the amount of material used in the heat exchange tube 20, reduce costs, and at the same time ensure the strength of the heat exchange tube 20.

[0124] In some embodiments, the thickness of the heat-conducting layer 32 can be 1-2 times the wall thickness of the heat exchange tube 20. For example, the thickness of the heat-conducting layer 32 can be 1, 1.2, 1.4, 1.6, 1.8 or 2 times the wall thickness of the heat exchange tube 20.

[0125] To improve the connection between the bend 22 and the straight pipe 211, the bend 22 and the straight pipe 211 are nested and then welded together, resulting in the outer walls of the bend 22 and the straight pipe 211 being uneven.

[0126] To improve sealing, in some embodiments, the wall thickness of the first heat pipe 32a and the wall thickness of the second heat pipe 32b may be different, so that the outer walls of the first heat pipe 32a and the second heat pipe 32b are flush.

[0127] For example, the end of the bent tube 22 is nested inside the straight tube 211. Correspondingly, the wall thickness of the first heat pipe 32a is less than the wall thickness of the second heat pipe 32b, so that the outer walls of the first heat pipe 32a and the second heat pipe 32b are flush.

[0128] In some embodiments, the thickness of the thermally conductive layer 32 is 1-3 mm. Exemplarily, the thickness of the thermally conductive layer 32 is 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, or 3 mm.

[0129] In some embodiments, the wall thickness of the heat exchange tube 20 is 1-1.5 mm. Exemplarily, the wall thickness of the heat exchange tube 20 is 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm.

[0130] In some embodiments, to improve the connection strength between the heat-conducting layer 32 and the heat exchange tube 20, protrusions or pits are provided on the outer wall of the heat exchange tube 20 to increase the contact area between the heat-conducting layer 32 and the heat exchange tube 20. Optionally, multiple protrusions or pits can be provided.

[0131] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A heat exchanger, characterized in that, It includes at least two heat exchange components stacked together, the heat exchange components including: Heat exchange tubes (20) are connected to each other in two adjacent heat exchange assemblies; The fin structure (30) is formed by die casting and connected to the heat exchange tube (20). The melting point of the fin structure (30) is lower than that of the heat exchange tube (20). The fin structure (30) of each heat exchange component is formed separately.

2. The heat exchanger according to claim 1, characterized in that, The fin structures (30) of two adjacent heat exchange components are spaced apart or connected.

3. The heat exchanger according to claim 2, characterized in that, The fin structures (30) of two adjacent heat exchange components are welded and fixed, or the fin structures (30) of two adjacent heat exchange components are slidably assembled and connected.

4. The heat exchanger according to claim 3, characterized in that, The top and bottom ends of the fin structure (30) are each equipped with a plug-in portion (313) and a plug-in groove (314). The plug-in groove (314) is a through groove, and the plug-in portion (313) can be slidably assembled with the plug-in groove (314).

5. The heat exchanger according to claim 4, characterized in that, One end of the plug-in portion (313) is provided with a baffle (315), which can abut against the end face of the plug-in slot (314) of the adjacent heat exchange component.

6. The heat exchanger according to any one of claims 1-5, characterized in that, The heat exchanger also includes two end plates (10) arranged opposite each other, and each heat exchange component is connected to the end plate (10); And / or, the fin structure (30) is made of aluminum alloy, and the heat exchange tube (20) is made of copper or stainless steel.

7. The heat exchanger according to any one of claims 1-5, characterized in that, The fin structure (30) includes a heat-conducting layer (32) and fins (31), the heat-conducting layer (32) covering at least a portion of the outer wall of the heat exchange tube (20), and the fins (31) being connected to the heat-conducting layer (32); Alternatively, the fin structure (30) includes multiple fins (31), the outer wall of the heat exchange tube (20) is provided with a fixing groove, and one end of the fin (31) is located in the fixing groove.

8. The heat exchanger according to claim 7, characterized in that, The thickness of the heat-conducting layer (32) is greater than or equal to the wall thickness of the heat exchange tube (20); And / or, the thickness of the heat-conducting layer (32) is 1-2 times the wall thickness of the heat exchange tube (20); And / or, the thickness of the thermally conductive layer (32) is 1-3 mm; And / or, the wall thickness of the heat exchange tube (20) is 1-1.5 mm; And / or, the outer wall of the heat exchange tube (20) is provided with protrusions or pits.

9. The heat exchanger according to any one of claims 1-5, characterized in that, The fin structure (30) includes fins (31), and the fins (31) are flat plate structures; Alternatively, the fin (31) may include: Finned plate (311); The fin plate (311) has a protrusion on at least one side.

10. A heating device, characterized in that, Includes the heat exchanger as described in any one of claims 1-9.

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