Heat exchanger and water heater

Abstract

The heat exchanger comprises a heat exchange assembly and an end plate, and the heat exchange assembly comprises a plurality of heat exchange pipes which are sequentially arranged at intervals in the first direction; the two ends of the heat exchange assembly are each provided with an end plate, each end plate is provided with a plurality of communicating parts and a plurality of through holes, the outer periphery of each through hole of each end plate is provided with an annular protruding part extending towards the other end plate, each communicating part is provided with a communicating opening communicating with the corresponding through hole, and every two heat exchange pipes communicate with each other through the communicating opening of one communicating part. A communicating part communicating the two heat exchange tubes is defined as a first communicating part, the maximum opening width of a communicating opening of the first communicating part in the first direction is W1, the maximum width of two annular protruding parts on the outer sides of the two heat exchange tubes communicating with the first communicating part in the first direction is W2, and W1 is smaller than or equal to W2. According to the heat exchanger, the pipe distance between the two heat exchange pipes can be reduced, so that the number of the arranged heat exchange pipes is increased, and the heat exchange efficiency of the heat exchanger is improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange, and in particular to a heat exchanger and a water heater. Background Art

[0002] In the related art, the heat exchanger is the main component of the gas water heater. The existing heat exchanger structure design is unreasonable. When the heat exchanger has a certain size, the number of heat exchange tubes arranged in the existing heat exchanger is small, resulting in low heat exchange efficiency of the heat exchanger, which affects the performance of the water heater. Summary of the invention

[0003] The main purpose of the present invention is to provide a heat exchanger and a water heater including the heat exchanger, aiming to reduce the tube spacing between two heat exchange tubes to increase the number of heat exchange tubes arranged, thereby improving the heat exchange efficiency of the heat exchanger.

[0004] To achieve the above object, the present invention provides a heat exchanger, comprising:

[0005] A heat exchange assembly, comprising a plurality of heat exchange tubes sequentially arranged at intervals along a first direction; and

[0006] An end plate, one end plate is provided at each end of the heat exchange assembly, each end plate has a plurality of connecting parts and a plurality of through holes, an annular convex part extending toward the other end plate is provided at the outer periphery of each through hole of the end plate, an end of each heat exchange tube is inserted into one of the annular convex parts and sealedly connected to the annular convex part, the connecting part has a connecting port connected to the through hole, every two heat exchange tubes are connected through a connecting port of one of the connecting parts, and a plurality of heat exchange tubes are connected through a plurality of the connecting parts to form a heat exchange channel;

[0007] The connecting portion connecting the two heat exchange tubes is defined as a first connecting portion, the maximum opening width of the connecting port of the first connecting portion along the first direction is W1, the maximum width of the two annular protrusions on the outer sides of the two heat exchange tubes connected to the first connecting portion along the first direction is W2, W1≤W2.

[0008] In one embodiment, the end plate includes a first plate body and a second plate body, the first plate body is provided with the through hole, the second plate body is provided with the connecting portion, and the second plate body is arranged on the side of the first plate body facing away from the heat exchange tube and is sealed and connected to the first plate body.

[0009] In one embodiment, the second plate body has a first plate surface facing the first plate body and a second plate surface facing away from the first plate body, and the first plate surface is recessed toward the second plate surface to form the connecting portion.

[0010] In one embodiment, the second plate surface bulges in a direction away from the first plate surface, so that the connecting portion forms a bulge on the second plate surface.

[0011] In one embodiment, the convex bump and the second plate body are an integral structure, and the connecting portion and the convex bump are formed by stamping.

[0012] In one embodiment, a first flange extending away from the other end plate and arranged in a ring shape is provided at the periphery of the first plate body, the first flange and the first plate body are combined to form a receiving groove, the second plate body is arranged in the receiving groove, and the periphery of the second plate body is sealed and connected to the first plate body and / or the first flange.

[0013] In one embodiment, at least one of the heat exchange tubes is provided with a spoiler for disturbing the water flow, and the spoiler includes a spoiler body and two supporting parts, the top ends of the two supporting parts are connected to the spoiler body, and the bottom ends of the two supporting parts are spaced apart and respectively supported on the inner wall of the heat exchange tube.

[0014] In one embodiment, the spoiler body is provided with a plurality of spoiler holes, the plurality of spoiler holes are arranged at intervals along the length direction of the heat exchange tube, and the spoiler has a water-facing end; an edge of each spoiler hole away from the water-facing end is provided with a spoiler blade inclined outward, and two adjacent spoilers are located on both sides of the spoiler body; and / or,

[0015] A flow-disturbing ridge extending toward the water-facing end is provided on the hole wall of at least one of the flow-disturbing holes.

[0016] In one embodiment, the heat exchange tube is an elliptical tube;

[0017] And / or, the annular protrusion is arranged in an elliptical ring shape, and the end of the heat exchange tube passes through the annular protrusion and extends into the through hole;

[0018] And / or, the through hole is arranged in an elliptical shape.

[0019] In one embodiment, the end plate is a stainless steel piece;

[0020] And / or, the heat exchange tube is an elliptical tube made of stainless steel, and the ratio of the major axis of the heat exchange tube to the minor axis of the heat exchange tube is not less than 2 and not greater than 3.

[0021] The present invention also provides a water heater, which comprises the heat exchanger as described above.

[0022] The heat exchanger of the present invention includes a heat exchange component and an end plate. The heat exchange component includes a plurality of heat exchange tubes arranged in sequence along a first direction. An end plate is provided at each end of the heat exchange component. Each end plate has a plurality of connecting parts and a plurality of through holes. The outer periphery of each through hole of the end plate is provided with an annular protrusion extending toward the other end plate. The end of each heat exchange tube is inserted into an annular protrusion and sealed with the annular protrusion. Every two heat exchange tubes are connected through a connecting port of a connecting part. The connecting part connecting the two heat exchange tubes is defined as a first connecting part. The maximum opening width of the connecting port of the first connecting part along the first direction is W1. The maximum width of the two annular protrusions on the outer sides of the two heat exchange tubes connected to the first connecting part along the first direction is W2, and W1≤W2. In such a configuration, the annular protrusion is connected to the end of the heat exchange tube, and the annular protrusion does not occupy the internal space of the connecting port of the first connecting portion, so that the opening width of the connecting port of the first connecting portion along the first direction can be reduced, that is, the width dimension of the first connecting portion along the first direction can be reduced, so that the tube spacing between the two heat exchange tubes connected to the first connecting portion can be reduced. The tube spacing between the two heat exchange tubes is reduced, and when the size of the heat exchange component is constant, it is beneficial for the heat exchange component to arrange more heat exchange tubes in the first direction. The number of heat exchange tubes increases, which can improve the heat exchange efficiency of the heat exchanger. It can be seen that the technical solution of the present application is conducive to reducing the tube spacing between the two heat exchange tubes, thereby improving the heat exchange efficiency of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of an embodiment of a heat exchanger of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure after the structure is decomposed;

[0026] Figure 3 for Figure 1 A cross-sectional view of the structure in FIG.

[0027] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0028] Figure 5 for Figure 1 Schematic diagram of the structure after the partial structure is decomposed;

[0029] Figure 6 for Figure 1 A cross-sectional view of the structure in FIG.

[0030] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0031] Figure 8 for Figure 1 A cross-sectional view of the structure in FIG.

[0032] Fig. 9 for Figure 8 A partial enlarged view of point C in the middle;

[0033] Fig.10 for Figure 2 A schematic diagram of the structure of the heat exchanger in FIG.

[0034] Fig.11 for Fig.10 A partial enlarged view of point D in the middle;

[0035] Fig.12 for Figure 2 A schematic diagram of the structure of the spoiler;

[0036] Fig.13 for Fig.12 A partial enlarged view of point E in the middle;

[0037] Fig.14 for Figure 1 A cross-sectional view of the structure in FIG.

[0038] Description of Figure Numbers:

[0039] Label name Label name 10 Heat Exchanger 320 Through Hole 11 Water Inlet 330 Annular convex part 12 Water outlet 340 The first plate 13 Inlet pipe section 341 First Flanging 14 Outlet pipe section 350 The second plate 100 Heat exchange tube 360 convex hull 200 Heat exchanger 370 Storage tank 210 Mounting holes 400 Spoiler 220 Baffle strip 410 Spoiler body 230 Diversion hole 411 Spoiler 240 Diversion edge 412 Spoiler 250 Second Flanging 413 Spoiler thorns 300 End Plate 420 Support 310 Connectivity 421 First support leg 311 Connecting port 422 Second support leg 312 First connecting part

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] A water heater generally includes a heat exchanger, a burner and a fan. The heat exchanger includes a heat exchange tube and a heat exchange plate sleeved on the outer periphery of the heat exchange tube. The water inlet end of the heat exchange tube is connected to a cold water inlet pipe, and the water outlet end of the heat exchange tube is connected to a hot water outlet pipe. The burner is arranged below the heat exchanger. For a strong drum type gas water heater, the fan is arranged below the burner; for a strong extraction type gas water heater, the fan is arranged above the heat exchanger. When the water heater is working, the fan starts, and the mixture of gas and air enters the burner for combustion. The cold water in the external water supply system can enter the heat exchange tube of the heat exchanger through the cold water inlet pipe. The high-temperature flue gas generated by the burner flows upward to exchange heat with the heat exchanger to heat the water in the heat exchange tube. The heated hot water can be output to the user end through the hot water outlet pipe to provide hot water for the user.

[0045] When the size of the heat exchanger is constant, a larger tube spacing between adjacent heat exchange tubes will result in a reduction in the number of installed heat exchange tubes, thereby affecting the heat exchange efficiency of the heat exchanger and the performance of the water heater.

[0046] Based on this, the present invention proposes a heat exchanger and a water heater including the heat exchanger. The tube spacing between two heat exchange tubes of the heat exchanger is small, so that the number of arranged heat exchange tubes can be increased, thereby improving the heat exchange efficiency of the heat exchanger.

[0047] See also Figure 1 , Figure 2 , Figure 8 and Fig. 9In one embodiment of the heat exchanger 10 of the present invention, the heat exchanger 10 includes a heat exchange component and an end plate 300, the heat exchange component includes a plurality of heat exchange tubes 100 arranged in sequence along a first direction; an end plate 300 is provided at each end of the heat exchange component, each of the end plates 300 has a plurality of connecting portions 310 and a plurality of through holes 320, and an annular convex portion 330 extending toward the other end plate 300 is provided at the outer periphery of each of the through holes 320 of the end plate 300, and an end of each of the heat exchange tubes 100 is inserted into one of the annular convex portions 330 and is sealed and connected to the annular convex portion 330, and the connecting portion 310 has The communication port 311 communicated with the through hole 320, every two heat exchange tubes 100 are communicated through the communication port 311 of the communication part 310, and a plurality of heat exchange tubes 100 are connected through a plurality of the communication parts 310 to form a heat exchange channel; the communication part 310 connecting two heat exchange tubes 100 is defined as a first communication part 312, the maximum opening width of the communication port 311 of the first communication part 312 along the first direction is W1, and the maximum width of the two annular protrusions 330 on the outer sides of the two heat exchange tubes 100 connected with the first communication part 312 along the first direction is W2, W1≤W2 (such as Fig. 9 shown).

[0048] It can be understood that the two end plates 300 are arranged opposite to each other and spaced apart along the second direction, the heat exchange assembly is arranged between the two end plates 300, and the second direction intersects with the first direction. In this embodiment, the first direction can be specifically the width direction of the heat exchange assembly (for example, the front-to-back direction), and the second direction can be specifically the length direction of the heat exchange assembly (for example, the left-to-right direction). The two end plates 300 cooperate to support the heat exchange assembly, and the connecting parts 310 on the two end plates 300 also play the role of a water box to connect multiple independent heat exchange tubes 100 in series to form a tortuous heat exchange channel. With this arrangement, there is no need to set a bend structure on the outside of the two end plates 300 to connect two adjacent heat exchange tubes 100, which can simplify the assembly process and improve production efficiency.

[0049] Furthermore, a plurality of through holes 320 are provided on the end plate 300, and an annular protrusion 330 is provided on the outer periphery of the through hole 320. The annular protrusion 330 is provided on the side of the end plate 300 facing the other end plate 300, that is, the annular protrusion 330 is provided on the side of the end plate 300 facing the heat exchange component. This not only facilitates the insertion of the end of the heat exchange tube 100 into the annular protrusion 330, but also facilitates the sealed connection between the heat exchange tube 100 and the annular protrusion 330. The sealed connection method includes but is not limited to: welding sealing, or filling sealing with a seal. In this embodiment, the heat exchange tube 100 is welded and sealed with the annular protrusion 330 sleeved on the outside of its end, which not only simplifies the assembly process but also ensures the stability of the seal.

[0050] See also Figures 6 to 9 In this embodiment, the annular protrusion 330 is arranged on the side of the end plate 300 facing the heat exchange component, and the side of the end plate 300 facing away from the heat exchange component does not need to be provided with a connecting portion adapted to the connecting portion 310, that is, the side of the end plate 300 facing away from the heat exchange component does not need to be provided with an annular protrusion 330 adapted to the connecting portion 310, and every two heat exchange tubes 100 are connected through a connecting port 311 of a connecting portion 310, and W1 is less than or equal to W2, which means that the annular protrusion 330 in this embodiment does not occupy the internal space of the connecting port 311 of the first connecting portion 312, which is beneficial to reducing the width dimension of the connecting port 311 of the first connecting portion 312 along the first direction, so that the width dimension of the first connecting portion 312 along the first direction can be reduced, that is, the width dimension of the first connecting portion 312 can be reduced. The reduction in the width of the first connecting portion 312 is beneficial to reducing the tube spacing between the two heat exchange tubes 100 connected to the first connecting portion 312, so that the heat exchange component can increase the number of heat exchange tubes 100 within a certain width range, thereby improving the heat exchange efficiency of the heat exchange component, that is, improving the heat exchange efficiency of the heat exchanger 10.

[0051] The heat exchanger 10 of the present invention includes a heat exchange component and an end plate 300. The heat exchange component includes a plurality of heat exchange tubes 100 arranged in sequence along a first direction. An end plate 300 is provided at each end of the heat exchange component. Each end plate 300 has a plurality of connecting parts 310 and a plurality of through holes 320. The outer periphery of each through hole 320 of the end plate 300 is provided with an annular protrusion 330 extending toward the other end plate 300. The end of each heat exchange tube 100 is inserted into an annular protrusion 330 and is sealed and connected to the annular protrusion 330. Every two heat exchange tubes 100 are connected through a connecting port 311 of a connecting part 310. The connecting part 310 connecting the two heat exchange tubes 100 is defined as a first connecting part 312. The maximum opening width of the connecting port 311 of the first connecting part 312 along the first direction is W1. The maximum width of the two annular protrusions 330 on the outer sides of the two heat exchange tubes 100 connected to the first connecting part 312 along the first direction is W2, and W1≤W2. In this configuration, the annular protrusion 330 is connected to the end of the heat exchange tube 100, and the annular protrusion 330 does not occupy the internal space of the communication port 311 of the first communication portion 312, so that the opening width of the communication port 311 of the first communication portion 312 along the first direction can be reduced, that is, the width dimension of the first communication portion 312 along the first direction can be reduced, so that the tube spacing between the two heat exchange tubes 100 connected to the first communication portion 312 can be reduced. The tube spacing between the two heat exchange tubes 100 is reduced, and when the size of the heat exchange component is constant, it is beneficial for the heat exchange component to arrange more heat exchange tubes 100 in the first direction. The number of heat exchange tubes 100 increases, which can improve the heat exchange efficiency of the heat exchanger 10. It can be seen that the technical solution of the present application is conducive to reducing the tube spacing between the two heat exchange tubes 100, thereby improving the heat exchange efficiency of the heat exchanger 10.

[0052] See also Figure 1 , Figure 2 and Figure 5 In one embodiment, the end plate 300 includes a first plate body 340 and a second plate body 350, the first plate body 340 is provided with the through hole 320, the second plate body 350 is provided with the connecting portion 310, and the second plate body 350 is arranged on the side of the first plate body 340 facing away from the heat exchange tube 100 and is sealed and connected to the first plate body 340.

[0053] It is understandable that the connecting portion 310 on the second plate 350 can be formed by stamping into a groove shape, and the side of the second plate 350 facing away from the connecting port 311 can be a plane, or of course, it can be convex, which is not limited here, and will be described in detail later. The connecting port 311 of the connecting portion 310 is connected to the through hole 320 on the first plate 340, and the heat exchange tube 100 is connected to the through hole 320 on the first plate 340, so that the heat exchange tube 100 is connected to the connecting portion 310. The second plate body 350 is arranged on the side of the first plate body 340 facing away from the heat exchange tube 100, so as to facilitate the sealed connection between the second plate body 350 and the first plate body 340. The second plate body 350 and the heat exchange tube 100 do not interfere with each other. The sealing connection method includes but is not limited to: the second plate body 350 is welded and sealed with the first plate body 340 as a whole, or is filled and sealed as a whole through a seal. This is conducive to simplifying the assembly process. There is no need to configure a bend structure for every two heat exchange tubes 100. The sealing connection is performed through the entire second plate body 350, which is conducive to improving assembly efficiency.

[0054] In one embodiment, the second plate body 350 has a first plate surface facing the first plate body 340 and a second plate surface facing away from the first plate body 340, and the first plate surface is recessed in the direction of the second plate surface to form the connecting portion 310. In this configuration, the connecting portion 310 is formed by the second plate body 350 being recessed in the direction of the second plate surface into a groove shape, and the groove shape can be formed by stamping, that is, the second body can be formed into the connecting portion 310 by stamping, so that the connecting portion 310 is easy to form, which is conducive to simplifying the manufacturing process of the end plate 300.

[0055] See also Figure 6 and Figure 7In one embodiment, the second plate surface bulges in a direction away from the first plate surface, so that the communication portion 310 forms a convex bulge 360 ​​on the second plate surface. It can be understood that when the thickness of the second plate body 350 is relatively thick, it is difficult to form the groove-shaped communication portion 310 by stamping. In this solution, the thickness of the second plate body 350 is relatively thin, so that when the second plate body 350 is stamped, a convex bulge 360 ​​is formed on the second plate surface facing away from the first plate body 340. The convex bulge 360 ​​structure not only makes the communication portion 310 easy to stamp, but also helps to reduce the material consumption of the second plate body 350, thereby reducing the manufacturing cost.

[0056] In one embodiment, the convex hump 360 and the second plate body 350 are an integral structure, and the connecting portion 310 and the convex hump 360 are stamped. It can be understood that, compared with the convex hump 360 and the second plate body 350 being fixed by welding, the convex hump 360 and the connecting portion 310 in this solution are both stamped by the second plate body 350, which is not only conducive to enhancing the strength of the second plate body 350, but also simplifies the manufacturing process of the connecting portion 310, avoids the problem of loose sealing when the convex hump 360 and the second plate body 350 are sealed (for example, welded sealing), and improves the reliability of the second body.

[0057] See also Figure 1 , Figure 2 and Figure 5 In one embodiment, the periphery of the first plate body 340 is provided with a first flange 341 extending back to the other end plate 300 and arranged in a ring shape, the first flange 341 and the first plate body 340 are surrounded to form a receiving groove 370, the second plate body 350 is arranged in the receiving groove 370, and the periphery of the second plate body 350 is sealed and connected to the first plate body 340 and / or the first flange 341.

[0058] It is understandable that a receiving groove 370 is formed on one side of the first plate 340 facing the second plate 350, and the second plate 350 is disposed in the receiving groove 370, so as to facilitate the rapid positioning and installation of the second plate 350. The periphery of the second plate 350 can be welded and sealed with the first plate 340, and the periphery of the second plate 350 can also be welded and sealed with the first flange 341. Of course, the periphery of the second plate 350 can also be welded and sealed with the connection between the first plate 340 and the first flange 341, and the specific details are not limited here. By sealingly connecting the periphery of the second plate 350 with the first plate 340 and / or the first flange 341, a plurality of connecting portions 310 are formed on the second plate 350, and the connecting portions 310 do not need to be welded with the heat exchange tube 100. Compared with the need to weld a bend structure for every two heat exchange tubes 100, this solution can simplify the assembly process of the heat exchanger 10 and improve production efficiency.

[0059] In one embodiment, one of the multiple communication parts 310 is provided with a water inlet 11, and another of the communication parts 310 is provided with a water outlet 12. The heat exchanger 10 further includes a water inlet pipe section 13 and a water outlet pipe section 14. The water inlet pipe section 13 is connected to the water inlet 11, and the water outlet pipe section 14 is connected to the water outlet 12. The water inlet 11 and the water outlet 12 are located on the same side of the heat exchanger 10. Such a configuration is conducive to making full use of the space on the same side of the heat exchanger 10, improving the compactness of the water path arrangement of the water heater, reducing the space occupied by the water path arrangement device of the water heater, and thus helping to reduce the volume of the water heater.

[0060] When the water heater is working, cold water enters the heat exchange tube 100, and the high-temperature flue gas flows upward. The lowermost end of the heat exchange tube 100 contacts the high-temperature flue gas first. The lowermost end of the heat exchange tube 100 is the fire-facing end. The fire-facing end of the heat exchange tube 100 is prone to local high-temperature vaporization and generates noise, thereby affecting the silent performance index of the water heater.

[0061] In order to reduce the vaporization noise of the heat exchange tube 100, please refer to Figure 2 , Figure 4 , Fig.12 and Fig.13 In one embodiment, at least one of the heat exchange tubes 100 is provided with a spoiler 400 for disturbing the water flow, and the spoiler 400 includes a spoiler body 410 and two supporting parts 420, the top ends of the two supporting parts 420 are connected to the spoiler body 410, and the bottom ends of the two supporting parts 420 are spaced apart and respectively supported on the inner wall of the heat exchange tube 100.

[0062] It is understandable that a spoiler 400 may be provided in each heat exchange tube 100. Of course, the spoiler 400 may also be provided in only one or part of the heat exchange tubes 100 as required, and the specifics are not limited here. In this embodiment, a spoiler 400 may be provided in each heat exchange tube 100, and the spoiler 400 can extend the flow path of the water flow in the heat exchange tube 100, enhance the spoiler effect, increase the contact time between the high-temperature flue gas and the water, and make the heat exchange between the high-temperature flue gas and the water more sufficient.

[0063] Furthermore, the spoiler 400 includes a spoiler body 410 and two supporting parts 420. The spoiler body 410 is connected to the top ends of the two supporting parts 420, so that the spoiler 400 is roughly arranged in a "human" shape. The bottom ends of the two supporting parts 420 are arranged at intervals and are respectively supported on the inner wall surface of the fire-facing end of the heat exchange tube 100. The two supporting parts 420 increase the contact area with the inner wall surface of the fire-facing end of the heat exchange tube 100, destroy the flow boundary layer of the inner wall surface of the fire-facing end of the heat exchange tube 100, thereby increasing the contact time between the high-temperature flue gas and water, which is beneficial to increasing the temperature of the water flow in the heat exchange tube 100, that is, strengthening the inner side heat transfer of the fire-facing end of the heat exchange tube 100, thereby reducing the noise generated by the local overheating vaporization of the fire-facing end of the heat exchange tube 100. It can be seen that the present solution increases the turbulence effect on water by providing the spoiler 400, destroys the flow boundary layer on the inner wall surface of the fire-facing end of the heat exchange tube 100, and makes the heat exchange between the water flow and the high-temperature flue gas more complete, thereby being able to reduce the vaporization noise of the heat exchange tube 100.

[0064] Further, one of the two supporting parts 420 includes a plurality of first supporting legs 421, and the other supporting part 420 includes a plurality of second supporting legs 422, and the plurality of first supporting legs 421 and the plurality of second supporting legs 422 are alternately arranged in sequence along the length direction of the spoiler 400, and the plurality of first supporting legs 421 are tilted toward one side of the spoiler body 410, and the plurality of second supporting legs 422 are tilted toward the other side of the spoiler body 410. Such a configuration enables the plurality of first supporting legs 421 and the plurality of second supporting legs 422 to be stably supported on the inner wall of the heat exchange tube 100, and can also enhance the spoiler effect.

[0065] In one embodiment, on the axial projection surface of the heat exchange tube 100, the first support leg 421 and the second support leg 422 form an angle, and the angle is an acute angle. Such an arrangement makes the distance between the bottom end of the first support leg 421 and the bottom end of the second support leg 422 closer, and the distances to the bottom end of the fire-facing end of the heat exchange tube 100 are closer, which is conducive to destroying the flow boundary layer of the inner wall surface of the fire-facing end of the heat exchange tube 100, thereby strengthening the heat transfer inside the fire-facing end of the heat exchange tube 100, and achieving the effect of reducing the noise generated by the local overheating vaporization of the fire-facing end of the heat exchange tube 100.

[0066] Of course, in other embodiments, on the axial projection surface of the heat exchange tube 100, the first supporting leg 421 and the second supporting leg 422 form an angle, and the angle is a right angle or an obtuse angle, which is not specifically limited here.

[0067] See also Fig.12 and Fig.13In one embodiment, the spoiler body 410 is provided with a plurality of spoiler holes 411, and the plurality of spoiler holes 411 are arranged at intervals along the length direction of the heat exchange tube 100, and the spoiler 400 has a water-facing end; an edge of each of the spoiler holes 411 away from the water-facing end is provided with a spoiler 412 inclined outwardly, and two adjacent spoilers 412 are located on both sides of the spoiler body 410;

[0068] And / or, a spoiler ridge 413 extending toward the water-facing end is provided on a hole wall of at least one of the spoiler holes 411 .

[0069] It is understandable that each spoiler hole 411 is provided with a spoiler 412 inclined outwardly, and each spoiler 412 is provided at the edge of the spoiler hole 411 away from the water-facing end, which can enhance the spoiler effect and prevent water from scaling in the heat exchange tube 100. Two adjacent spoilers 412 are located on both sides of the spoiler body 410, which can further enhance the spoiler effect.

[0070] In addition, a spoiler rib 413 is provided in the spoiler hole 411, and the spoiler rib 413 extends toward the water-facing end of the spoiler 400. When the water flows through the spoiler hole 411, the spoiler rib 413 blocks the water flow to extend the flow path of the water flow in the heat exchange tube 100, further enhancing the spoiler effect, thereby further reducing the vaporization noise of the heat exchange tube 100.

[0071] In one embodiment, a spoiler ridge 413 is provided on the top wall and / or the bottom wall of the spoiler hole 411. In this way, when water passes through the spoiler hole 411, the spoiler ridge 413 provided on the top wall of the spoiler hole 411 and / or the spoiler ridge 413 provided on the bottom wall of the spoiler hole 411 increase the spoiler effect of the spoiler 400, so that the heat exchange between the water flow and the high-temperature flue gas is more sufficient, and the vaporization noise of the heat exchange tube 100 is further reduced.

[0072] In one embodiment, the heat exchange tube 100 is an elliptical tube;

[0073] And / or, the annular protrusion 330 is arranged in an elliptical ring shape, and the end of the heat exchange tube 100 passes through the annular protrusion 330 and extends into the through hole 320;

[0074] And / or, the through hole 320 is arranged in an elliptical shape.

[0075] It can be understood that the heat exchange tube 100 is an elliptical tube. Compared with the conventional circular heat exchange tube 100, the elliptical heat exchange tube 100 is more conducive to the high-temperature flue gas flowing to the back side of the heat exchange tube 100 for heat exchange, and the heat exchange area per unit volume of the elliptical tube is larger than that of the circular tube, thereby effectively improving the heat exchange efficiency of the heat exchanger 10.

[0076] The annular protrusion 330 is in the shape of an elliptical ring, so as to be compatible with the elliptical heat exchange tube 100. When the end of the elliptical heat exchange tube 100 is inserted into the annular protrusion 330, the outer wall of the heat exchange tube 100 can be closely fitted with the inner wall surface of the annular protrusion 330, thereby facilitating the sealed connection between the heat exchange tube 100 and the annular protrusion 330. In addition, the end of the heat exchange tube 100 passes through the annular protrusion 330 and extends into the through hole 320, which increases the contact area between the heat exchange tube 100 and the end plate 300, and is conducive to improving the connection stability between the heat exchange tube 100 and the end plate 300.

[0077] In addition, the through hole 320 is elliptical in shape to facilitate matching with the elliptical heat exchange tube 100, that is, the end of the elliptical heat exchange tube 100 extends into the through hole 320 and fits tightly with the end plate 300, so that multiple through holes 320 are compactly arranged on the end plate 300, which is beneficial to reduce the tube spacing between the two heat exchange tubes 100.

[0078] It can be understood that the water stop temperature rise / start-stop overshoot means that when the water heater is working normally, the finned tube (that is, the heat exchange tube 100 with the heat exchange fin 200) is in a high temperature state. When the water heater stops working, the heat on the finned tube will be quickly transferred to the stopped water, causing the water temperature to rise. When the water heater is restarted, a section of high-temperature water will flow out, which may seriously scald the user.

[0079] Based on this, in order to improve the heat exchange performance of the heat exchanger 10 and reduce the risk of scalding the user due to excessive temperature rise of the water in the heat exchanger 10 when the water supply is cut off, in one embodiment, the heat exchanger 10 also includes a plurality of heat exchange plates 200 arranged side by side, and the plurality of heat exchange tubes 100 are arranged in sequence and spaced apart along the length direction of each of the heat exchange plates 200 so as to be arranged in a single row on the heat exchange plates 200; on the axial projection surface of the heat exchange tube 100, the minimum distance between any point on the heat exchange plate 200 and the outer tube wall of the heat exchange tube 100 is not greater than 3 mm.

[0080] It can be understood that the heat exchanger 10 in this solution includes a plurality of heat exchange tubes 100, and the plurality of heat exchange tubes 100 are arranged in a single row on the heat exchange fins 200, that is, the plurality of heat exchange tubes 100 in this solution are single-layer tubes, and the single-layer fin tubes (that is, the single-layer heat exchange tubes 100 with the heat exchange fins 200) are directly in contact with the high-temperature flue gas. Compared with the double-layer fin tubes (that is, the upper and lower layers of heat exchange tubes 100), the single-layer fin tubes have fewer low-temperature areas, and the single-layer fin tubes do not have the problem of temperature difference between the upper and lower layers. When the burner of the water heater is working at a small load, the single-layer fin tubes with fewer low-temperature areas are not easy to produce condensed water, thereby reducing the risk of condensed water corroding the water heater. Compared with the double-layer fin tubes, the water-stop temperature rise of the single-layer fin tubes is reduced by half.

[0081] The axial projection surface of the heat exchange tube 100 can be understood as: the radial section along the heat exchange tube 100. The minimum distance between any point on the heat exchange plate 200 and the outer tube wall of the heat exchange tube 100 is not greater than 3 mm, which can be understood as: the spacing between any point on the heat exchange plate 200 and the heat exchange tube 100 is not greater than 3 mm, that is, along the radial direction of the heat exchange tube 100, the minimum distance between any point on the heat exchange plate 200 and the heat exchange tube 100 is not greater than 3 mm. In other words, on the radial section of the heat exchange tube 100, the minimum distance between any point on the heat exchange plate 200 and the outer tube wall of the heat exchange tube 100 is less than or equal to 3 mm, so that the distance between any point on the heat exchange plate 200 and the heat exchange tube 100 is closer. Among them, the minimum distance between a point on the heat exchange plate 200 and the outer tube wall of the heat exchange tube 100 can be 3 mm, or 2.5 mm, or 2 mm, or 1 mm, or 0 mm, etc., which is not specifically limited here.

[0082] The distance between any point on the heat exchange plate 200 and the heat exchange tube 100 is relatively close, and the temperature on the heat exchange plate 200 can be quickly transferred to the heat exchange tube 100, thereby improving the heat exchange performance of the heat exchange plate 200; and, the material utilization rate of the heat exchange plate 200 is also improved, and the temperature difference between the inner side of the heat exchange plate 200 closer to the heat exchange tube 100 and the outer side farther from the heat exchange tube 100 is reduced, and the high temperature area and low temperature area on the heat exchange plate 200 are reduced, so that the temperature distribution on the heat exchange plate 200 is more uniform. The reduction of the high temperature area on the heat exchange plate 200 is conducive to reducing the heat storage capacity of the heat exchange plate 200, thereby reducing the temperature rise of the water in the heat exchanger 10 when the water supply is cut off, which is conducive to reducing the risk of the user being scalded by the high temperature water when the user restarts the water heater. In other words, this solution makes the temperature distribution on the heat exchange plate 200 more uniform, reduces the high temperature area on the heat exchange plate 200, and reduces the temperature rise of the heat exchanger 10 when the water supply is cut off.

[0083] In addition, when the water heater is working at a small load, the low-temperature area on the heat exchanger 200 is reduced, which is conducive to increasing the temperature of the heat exchanger 200 after heat exchange with the high-temperature flue gas, so as to ensure that the temperature of the entire heat exchanger 200 is high, and the situation of local low temperature on the heat exchanger 200 causing condensed water is reduced, thereby reducing the risk of condensed water corroding the water heater. In other words, this solution makes the temperature distribution on the heat exchanger 200 more uniform, reduces the low-temperature area on the heat exchanger 200, and reduces the risk of condensed water generated by the heat exchanger 10 and corroding the water heater. It can be seen that the technical solution in this solution improves the heat exchange performance of the heat exchanger 10, reduces the risk of the water in the heat exchanger 10 having a high temperature rise when the water is stopped and scalding the user, and also reduces the risk of condensed water generated by the heat exchanger 10 and corroding the water heater.

[0084] See also Figure 3 , Figure 4 and Fig.14 In one embodiment, the heat exchanger 10 further includes a plurality of the heat exchange fins 200 arranged side by side, and the plurality of heat exchange tubes 100 are sequentially arranged at intervals along the length direction of each heat exchange fin 200, so as to be arranged in a single row on the heat exchange fin 200; along the first direction, the center distance between any two adjacent heat exchange tubes 100 is D1, and the maximum width of the heat exchange tube 100 is D2, and D1 and D2 satisfy the following relationship:

[0085]

[0086] It is understandable that the multiple heat exchange tubes 100 are arranged in a single row on the heat exchange fins 200, that is, the multiple heat exchange tubes 100 in this solution are single-layer tubes, and the single-layer fin tubes (that is, the single-layer heat exchange tubes 100 with heat exchange fins 200) are directly in contact with the high-temperature flue gas. Compared with the double-layer fin tubes (that is, the upper and lower layers of heat exchange tubes 100), the single-layer fin tubes have fewer low-temperature areas, and the single-layer fin tubes do not have the problem of temperature difference between the upper and lower layers. When the burner of the water heater is working at a small load, the single-layer fin tubes with fewer low-temperature areas are not easy to produce condensed water, thereby reducing the risk of condensed water corroding the water heater. In addition, the single-layer fin tubes are combined with the aforementioned heat exchange fins 200 with higher heat exchange performance, further improving the heat exchange performance of the heat exchanger 10.

[0087] In addition, half of the difference between D1 and D2 is less than or equal to 3 mm, so that the distance between the heat exchange fin 200 and the heat exchange tube 100 is closer, which is beneficial to improving the heat exchange capacity of the heat exchange fin 200, and is also beneficial to reducing the volume of the heat exchange fin 200, improving the material utilization rate of the heat exchange fin 200, so that the temperature on the heat exchange fin 200 can be evenly distributed. Among them, half of the difference between D1 and D2 can be 3 mm, or 2.5 mm, or 2 mm, or 1 mm, etc., which is not specifically limited here.

[0088] In one embodiment, the plurality of heat exchange tubes 100 are at the same height on the heat exchange plate 200. This arrangement allows the plurality of heat exchange tubes 100 to maintain a consistent distance from the burner, which helps ensure that the temperatures of the plurality of heat exchange tubes 100 when in contact with the high-temperature flue gas are substantially the same, and avoids the situation where a large temperature difference on the plurality of heat exchange tubes 100 arranged in a single row easily generates condensed water, thereby helping to increase the service life of the heat exchanger 10.

[0089] See also Figure 2 , Figure 3 and Fig.10In one embodiment, the heat exchanger 10 further includes a plurality of heat exchange fins 200 arranged side by side, and a plurality of mounting holes 210 are provided on the heat exchange fins 200. The plurality of mounting holes 210 are arranged in a single row and are arranged in sequence along the length direction of the heat exchange fins 200. The plurality of heat exchange tubes 100 are correspondingly passed through the plurality of mounting holes 210 of each of the heat exchange fins 200. It can be understood that the multiple mounting holes 210 on the heat exchange plate 200 are arranged in a single row and arranged in sequence at intervals, so that the multiple heat exchange tubes 100 are also arranged in a single row after correspondingly passing through the multiple mounting holes 210 on the heat exchange plate 200. The temperature difference of the multiple heat exchange tubes 100 arranged in a single row after contacting with the high-temperature flue gas is smaller. Compared with the double-row heat exchange tubes 100, the high-temperature flue gas first passes through the lower heat exchange tubes 100 and then passes through the upper heat exchange tubes 100. There is a temperature difference between the upper heat exchange tubes 100 and the lower heat exchange tubes 100, which makes it easy for the double-row heat exchange tubes 100 to generate condensed water. The multiple mounting holes 210 of the present solution are arranged in a single row, so that the multiple heat exchange tubes 100 are arranged in a single row, ensuring that the temperature on the multiple heat exchange tubes 100 remains consistent, reducing the risk of multiple heat exchange tubes 100 generating condensed water and corroding the water heater, and improving the reliability of the heat exchanger 10.

[0090] In one embodiment, the plurality of mounting holes 210 are all elliptical holes; and / or, the plurality of mounting holes 210 on the heat exchange plate 200 are all the same in size and height.

[0091] It can be understood that the multiple mounting holes 210 are all elliptical holes, so that the corresponding heat exchange tubes 100 passing through the multiple mounting holes 210 are also elliptical tubes. The elliptical heat exchange tubes 100 are more conducive to the high-temperature flue gas flowing to the back side of the heat exchange tubes 100 for heat exchange, and the heat exchange area per unit volume of the elliptical tubes is larger, which is beneficial to improving the heat exchange efficiency of the heat exchanger 10.

[0092] In addition, the size and height of the multiple mounting holes 210 on the heat exchange plate 200 are the same, which ensures the consistency of the multiple mounting holes 210 and is also beneficial to maintaining the size and height of the multiple heat exchange tubes 100 consistent. This is beneficial to ensuring that the temperatures of the multiple heat exchange tubes 100 when in contact with the high-temperature flue gas are basically the same, avoiding the situation where there is a large temperature difference on the multiple heat exchange tubes 100 arranged in a single row, which easily generates condensed water, thereby helping to increase the service life of the heat exchanger 10.

[0093] See also Fig.10 and Fig.11In one embodiment, a second flange 250 extending outward is provided on the outer periphery of the mounting hole 210. The second flange 250 can have a variety of shapes, such as but not limited to a ring shape. By providing the second flange 250, the sleeve area of ​​the heat exchange tube 100 and the heat exchange fin 200 is increased, and it is also beneficial to improve the stability of the connection between the heat exchange tube 100 and the heat exchange fin 200. In addition, by providing the second flange 250, it is also ensured that there can be a certain distance between two adjacent heat exchange fins 200, which is beneficial for high-temperature flue gas to pass between two adjacent heat exchange fins 200, thereby improving the heat exchange efficiency of the heat exchanger 10.

[0094] See also Fig.11 In one embodiment, a baffle bar 220 is provided at the upper edge of the heat exchange plate 200 , and the middle portion of the baffle bar 220 is recessed downward to be arranged in an arc shape. The baffle bar 220 is located between any two adjacent mounting holes 210 .

[0095] It can be understood that the baffle strip 220 is located between any two adjacent mounting holes 210, and the middle part of the baffle strip 220 is concave downward, so that a guide channel is formed between the baffle strip 220 and the heat exchange tube 100 in the adjacent mounting hole 210, and the guide channel can gather the high-temperature flue gas to flow in the upper half of the heat exchange tube 100, that is, to gather the high-temperature flue gas to flow on the back of the heat exchange tube 100; and it can also block the high-temperature flue gas from flowing directly upward, delay the separation of the high-temperature flue gas and the heat exchange tube 100, increase the heat exchange intensity and reduce heat loss, so as to improve the heat exchange efficiency. Among them, in this embodiment, the curvature of the guide strip is consistent with the curvature of the heat exchange tube 100 in the adjacent mounting hole 210, which is conducive to guiding the high-temperature flue gas to the back of the heat exchange tube 100 for heat exchange.

[0096] In one embodiment, a guide hole 230 is provided between any two adjacent mounting holes 210 , and a guide edge 240 is provided in a ring shape on the outer periphery of the guide hole 230 . The guide edge 240 is located directly below the baffle bar 220 .

[0097] It can be understood that the heat is more concentrated below the baffle bar 220. By providing the guide hole 230 directly below the baffle bar 220, local overheating of the position directly below the baffle bar 220 is avoided, which is beneficial to improving the uniformity of temperature distribution on the heat exchange plate 200; and, the outer periphery of the guide hole 230 is provided with a guide edge 240 arranged in a ring shape, and the guide edge 240 guides the gathered high-temperature flue gas to the periphery of the heat exchange tube 100. The provision of the guide edge 240 is beneficial to increasing the heat exchange area and the heat exchange efficiency.

[0098] In one embodiment, the heat exchanger 10 has a water inlet 11 and a water outlet 12, and the water inlet 11 and the water outlet 12 are located on the same side of the heat exchanger 10; and / or,

[0099] The number of the heat exchange tubes 100 is 6, and the 6 heat exchange tubes 100 are arranged in sequence and at intervals along the length direction of the heat exchange plate 200 .

[0100] It can be understood that the heat exchanger 10 further includes a water inlet pipe section 13 and a water outlet pipe section 14, the water inlet pipe section 13 is connected to the water inlet 11, and the water outlet pipe section 14 is connected to the water outlet 12. The water inlet 11 and the water outlet 12 are located on the same side of the heat exchanger 10, which is conducive to fully utilizing the space on the same side of the heat exchanger 10, and is conducive to improving the compactness of the water circuit layout of the water heater, reducing the space occupied by the water circuit layout device of the water heater, and thus helping to reduce the volume of the water heater.

[0101] In addition, the six heat exchange tubes 100 are arranged in sequence along the length direction of the heat exchange plate 200 at intervals so that the six heat exchange tubes 100 are arranged in a single row. The six heat exchange tubes 100 arranged in a single row can ensure that the temperature when in contact with the high-temperature flue gas remains basically consistent, reducing the risk of the heat exchange tubes 100 generating condensed water and corroding the water heater, thereby improving the reliability of the heat exchanger 10.

[0102] In one embodiment, the heat exchanger 200 is a stainless steel part; and / or the end plate 300 is a stainless steel part. It is understandable that stainless steel parts have good thermal conductivity, high temperature resistance and corrosion resistance. The heat exchanger 200 and / or the end plate 300 in the present application are made of stainless steel material, so that the heat exchanger 200 and / or the end plate 300 are not easily corroded by condensed water, that is, the heat exchanger 10 has good corrosion resistance, which is conducive to extending the service life.

[0103] In one embodiment, the heat exchange tube 100 is an elliptical tube made of stainless steel, and the ratio of the major axis of the heat exchange tube 100 to the minor axis of the heat exchange tube 100 is not less than 2 and not greater than 3. It can be understood that the heat exchange tube 100 is an elliptical tube, that is, the cross section of the heat exchange tube 100 along its radial direction is an ellipse, that is, the outer peripheral contour of the heat exchange tube 100 is an ellipse, and the ellipse has a major axis and a minor axis, and the ratio of the major axis and the minor axis is greater than or equal to 2 and less than or equal to 3. One end of the heat exchange tube 100 along its long axis direction is the fire-facing end. If the ratio of the long axis of the heat exchange tube 100 to the short axis of the heat exchange tube 100 is too large, the fire-facing end of the heat exchange tube 100 is prone to accumulate heat and cause the local temperature to be too high, so that the water in the heat exchange tube 100 is easily vaporized due to high temperature, thereby affecting the service life of the heat exchange tube 100; if the ratio of the long axis of the heat exchange tube 100 to the short axis of the heat exchange tube 100 is too small, that is, the heat exchange tube 100 is close to a circle, relative to the circular heat exchange tube 100, the elliptical heat exchange tube 100 is more conducive to the high-temperature flue gas flowing to the back side of the heat exchange tube 140 for heat exchange, and the heat exchange area per unit volume of the elliptical heat exchange tube 100 is larger than that of the circular tube, thereby effectively improving the heat exchange efficiency of the heat exchanger 100.

[0104] It can be seen that, by limiting the heat exchange tube 100 to be an elliptical tube made of stainless steel, and limiting the ratio range of the long axis of the heat exchange tube 100 to the short axis of the heat exchange tube 100, the solution not only makes the heat exchange tube 100 have good thermal conductivity, high temperature resistance and corrosion resistance, but also makes the contact area between the heat exchange tube 100 and the high-temperature flue gas larger, expands the heat exchange area, and thus can improve the heat exchange efficiency and material utilization. Among them, the ratio of the long axis of the heat exchange tube 100 to the short axis of the heat exchange tube 100 can be 2.0, or 2.2, or 2.5, or 2.8, or 3.0, which is not specifically limited here.

[0105] In addition, the heat exchanger plates 200 and the heat exchanger tubes 100 in the heat exchanger 10 are both made of stainless steel, and the minimum distance between any point on the heat exchanger plate 200 and the outer tube wall of the heat exchanger tube 100 is no more than 3 mm, that is, the distance between the heat exchanger plate 200 and the heat exchanger tube 100 is relatively close, and the temperature on the heat exchanger plate 200 can be quickly transferred to the heat exchanger tube 100, thereby further improving the heat exchange efficiency of the heat exchanger 10.

[0106] The present invention also provides a water heater, which includes the aforementioned heat exchanger 10. The specific structure of the heat exchanger 10 refers to the above embodiment. Since the water heater adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The water heater includes but is not limited to a strong drum water heater with a fan placed below, or a strong extraction water heater with a fan placed above.

[0107] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A heat exchanger, characterized in that: include: A heat exchange assembly, comprising a plurality of heat exchange tubes arranged in sequence and spaced apart along a first direction; as well as An end plate, one end plate is provided at each end of the heat exchange assembly, each end plate has a plurality of connecting parts and a plurality of through holes, an annular convex part extending toward the other end plate is provided at the outer periphery of each through hole of the end plate, an end of each heat exchange tube is inserted into one of the annular convex parts and sealedly connected to the annular convex part, the connecting part has a connecting port connected to the through hole, every two heat exchange tubes are connected through a connecting port of one of the connecting parts, and a plurality of heat exchange tubes are connected through a plurality of the connecting parts to form a heat exchange channel; The connecting portion connecting the two heat exchange tubes is defined as a first connecting portion, the maximum opening width of the connecting port of the first connecting portion along the first direction is W1, the maximum width of the two annular protrusions on the outer sides of the two heat exchange tubes connected to the first connecting portion along the first direction is W2, W1≤W2.

2. The heat exchanger according to claim 1, characterized in that The end plate includes a first plate body and a second plate body, the first plate body is provided with the through hole, the second plate body is provided with the connecting portion, and the second plate body is provided on a side of the first plate body facing away from the heat exchange tube and is sealed and connected to the first plate body.

3. The heat exchanger according to claim 2, characterized in that The second plate body has a first plate surface facing the first plate body and a second plate surface facing away from the first plate body, and the first plate surface is recessed toward the second plate surface to form the connecting portion.

4. The heat exchanger according to claim 3, characterized in that The second plate surface bulges in a direction away from the first plate surface, so that the connecting portion forms a convex hump on the second plate surface.

5. The heat exchanger according to claim 4, characterized in that The convex bump and the second plate body are an integral structure, and the connecting portion and the convex bump are formed by stamping.

6. The heat exchanger according to claim 2, characterized in that: The periphery of the first plate body is provided with a first flange extending back to the other end plate and arranged in a ring shape, the first flange and the first plate body are combined to form a receiving groove, the second plate body is arranged in the receiving groove, and the periphery of the second plate body is sealed and connected to the first plate body and / or the first flange.

7. The heat exchanger according to claim 1, characterized in that: At least one of the heat exchange tubes is provided with a spoiler for disturbing the water flow, and the spoiler includes a spoiler body and two supporting parts, the top ends of the two supporting parts are connected to the spoiler body, and the bottom ends of the two supporting parts are arranged at intervals and are respectively supported on the inner wall of the heat exchange tube.

8. The heat exchanger according to claim 7, characterized in that The spoiler body is provided with a plurality of spoiler holes, which are arranged at intervals along the length direction of the heat exchange tube, and the spoiler has a water-facing end; an edge of each spoiler hole away from the water-facing end is provided with a spoiler blade inclined outward, and two adjacent spoilers are located on both sides of the spoiler body; And / or, a hole wall of at least one of the spoiler holes is provided with a spoiler ridge extending toward the water-facing end.

9. The heat exchanger according to claim 1, characterized in that: The heat exchange tube is an elliptical tube; And / or, the annular protrusion is arranged in an elliptical ring shape, and the end of the heat exchange tube passes through the annular protrusion and extends into the through hole; And / or, the through hole is arranged in an elliptical shape.

10. The heat exchanger according to any one of claims 1 to 9, characterized in that: The end plate is made of stainless steel; And / or, the heat exchange tube is an elliptical tube made of stainless steel, and the ratio of the major axis of the heat exchange tube to the minor axis of the heat exchange tube is not less than 2 and not greater than 3.

11. A water heater, characterized in that: Comprising the heat exchanger according to any one of claims 1 to 10.

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