Heat exchanger and gas water heater

Abstract

The utility model discloses a heat exchanger and gas water heater, heat exchanger includes at least one layer heat exchange layer along the flue gas flowing direction arrangement, in at least one layer heat exchange layer, the downstream of the downstream end heat exchange layer of located is equipped with the guide vane with the smoke outlet, the guide vane is spaced apart with the end heat exchange layer in the flue gas flowing direction, and the flue gas flows to the end heat exchange layer, after passing through the interval space between the end heat exchange layer and the guide vane, discharges through the smoke outlet. Adopt this scheme, set up the guide vane in the downstream of the end heat exchange layer, can slow down the flue gas to flow out heat exchanger, make the flue gas can fully with the heat exchange of the end heat exchange layer, thereby can reduce the requirement to the heat exchange capacity of the end heat exchange layer itself, make the material of the end heat exchange layer can reduce accordingly, and then reduce the cost. In addition, the smoke outlet can make the flue gas discharge smoothly. Thus, the material of the end heat exchange layer can be reduced through the setting of the guide vane, while maintaining the heat storage performance.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange, and in particular to a heat exchanger and a gas water heater. Background Technology

[0002] The primary heat exchanger material in existing gas water heaters is copper. The mainstream copper heat exchanger has a double-layer tube structure, with a smaller number having a single-layer tube structure. Due to the high price of copper, the heat exchanger is also expensive. To reduce costs, the heat exchanger can be made with a single-layer tube, but this reduces the heat storage capacity, making the temperature drop problem during water outages particularly prominent. In other words, reducing the amount of copper material lowers costs but also leads to poorer performance; maintaining the heat exchanger's performance requires a high-cost copper material. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of existing heat exchangers in that they cannot balance cost and performance, and to provide a heat exchanger and a gas water heater.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A heat exchanger includes at least one heat exchange layer arranged along the flue gas flow direction, wherein a guide plate with a flue gas outlet is provided downstream of the most downstream end heat exchange layer.

[0006] The guide plate and the end heat exchange layer are spaced apart in the direction of flue gas flow. The flue gas flows toward the end heat exchange layer, passes through the space between the end heat exchange layer and the guide plate, and is discharged through the flue gas outlet.

[0007] In this design, a baffle plate is installed downstream of the terminal heat exchange layer. This baffle plate slows the flow of flue gas out of the heat exchanger, allowing the flue gas to fully exchange heat with the terminal heat exchange layer. This reduces the heat exchange capacity requirements of the terminal heat exchange layer itself, thus reducing the amount of material used and lowering costs. Furthermore, the baffle plate has a flue gas outlet, allowing the flue gas to exit smoothly. Therefore, this design, through the installation of the baffle plate, reduces the amount of material used in the terminal heat exchange layer while maintaining heat storage performance.

[0008] Preferably, the terminal heat exchange layer is a tube heat exchange layer comprising multiple tubes, and the guide plate has multiple tube receiving spaces. The internal shape of each tube receiving space matches the external shape of the tubes in the terminal heat exchange layer. The tube receiving spaces cover the tubes and correspond one-to-one with the tubes in the terminal heat exchange layer. In this solution, the tube receiving spaces of the guide plate match the tubes in the terminal heat exchange layer and cover the tubes, thereby making the size of the space between the tube receiving spaces and the tubes as uniform as possible, and thus ensuring a balanced improvement in heat exchange efficiency for each tube by the guide plate.

[0009] Preferably, the flue gas outlet is located at the top of the tube housing space and directly opposite the central axis of the tube. In this design, the above structure ensures a balanced movement path of the flue gas on both sides of the tube's central axis, optimizing the overall heat exchange effect of the tube.

[0010] Preferably, the pipe body receiving space has a plurality of smoke outlets, which are evenly arranged along the axial direction of the pipe body.

[0011] Preferably, the distance between the tube body and the space accommodating the tube body is in the range of 1mm to 6mm. In this design, the above-mentioned distance range is beneficial for achieving a balance between the heat exchange efficiency and the flue gas resistance of the heat exchanger.

[0012] Preferably, the area of ​​a single smoke outlet is 7 mm. 2 ~180mm 2 Alternatively, the smoke outlet is a circular hole, with the diameter of a single circular hole ranging from 3mm to 15mm.

[0013] Preferably, a drain outlet is provided between the accommodating spaces of two adjacent pipe bodies. In this design, when condensate accumulates on the surface of the guide plate, it can flow out through the drain outlet, thereby preventing large-area accumulation of condensate from easily flowing back from the exhaust port and affecting the exhaust and combustion effects.

[0014] Preferably, the drain outlet includes at least one of circular and elongated shapes.

[0015] Preferably, the area of ​​a single drain outlet is 7 mm. 2 ~180mm 2 Alternatively, the drain outlet is a circular hole, with the diameter of a single circular hole ranging from 3mm to 15mm.

[0016] Preferably, the pipe body receiving space protrudes in the direction of flue gas flow, and a downwardly recessed drainage groove is formed between two adjacent pipe body receiving spaces, with the drainage outlet located at the bottom of the drainage groove. In this design, the pipe body receiving space protruding in the direction of flue gas flow forms a convex shape on the upper surface of the guide plate, which facilitates the downward flow of condensate along the convex shape into the drainage groove, and its discharge through the drainage outlet located at the bottom of the groove.

[0017] Preferably, the guide plate further has two overlapping portions disposed at both ends of the tube body receiving space, and the two overlapping portions are respectively connected to the two side plates of the heat exchanger. In this embodiment, the guide plate overlaps the side plates of the heat exchanger through its overlapping portions, and both ends of the guide plate can be restricted by the two side plates of the heat exchanger, thereby making the installation reliable and also facilitating the formation of a gap space between the guide plate and the end heat exchange layer.

[0018] Preferably, the overlapping portion includes a vertical wall and a horizontal wall, the vertical wall being connected to the end of the tube receiving space and extending upward; the horizontal wall being connected to the extended end of the vertical wall and overlapping to the upper surface of the side plate.

[0019] Preferably, the guide plate further has two sleeve portions disposed at both ends of the tube body receiving space, each sleeve portion having a connecting hole, the connecting hole being fitted onto the tube body of the end heat exchange layer. In this solution, by fitting the guide plate onto the tube body of the end heat exchange layer through the connecting hole of the sleeve portion, it is possible to ensure that the guide plate and the tube body of the end heat exchange layer are arranged concentrically to the greatest extent possible, making the spacing between the guide plate and the end heat exchange layer as consistent as possible, which is beneficial to ensuring heat exchange efficiency and can also ensure stable and consistent product performance during mass production.

[0020] Preferably, the sleeve portion includes a first vertical section, a horizontal section, and a second vertical section. The first vertical section is connected to the end of the tube body accommodating space and extends upward. The horizontal section is connected to the extended end of the first vertical section and extends horizontally. The second vertical section is connected to the extended end of the horizontal section and extends downward. The sleeve hole is disposed in the second vertical section.

[0021] Preferably, the guide plate has downwardly extending extension plates at both ends in the width direction. In this design, the extension plates help to concentrate the flue gas and improve the heat exchange effect between the flue gas and the terminal heat exchange layer.

[0022] Preferably, there is one guide plate, which extends from one end of the end heat exchange layer to the other end along the length of the end heat exchange layer; or, there are multiple guide plates, which are arranged sequentially along the length of the end heat exchange layer.

[0023] Preferably, the tube body includes at least one of a light tube, a corrugated tube, a coiled tube, and a corrugated coiled tube.

[0024] A gas water heater, the gas water heater comprising a heat exchanger as described above.

[0025] The significant advantages of this invention are as follows: A guide vane is installed downstream of the terminal heat exchange layer. This guide vane slows the flow of flue gas out of the heat exchanger, allowing the flue gas to fully exchange heat with the terminal heat exchange layer. This reduces the heat exchange capacity requirements of the terminal heat exchange layer itself, thus reducing the amount of material needed and lowering costs. Furthermore, the guide vane has a flue gas outlet, which allows the flue gas to exit smoothly. Therefore, this solution reduces the amount of material needed for the terminal heat exchange layer while maintaining heat storage performance. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a heat exchanger provided in Embodiment 1 of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of a heat exchanger provided in Embodiment 1 of the present invention, wherein the guide plate is separated from other parts;

[0028] Figure 3 This is a schematic diagram of the structure of a heat exchanger provided in Embodiment 1 of the present invention, wherein the guide plate is separated from other parts;

[0029] Figure 4 This is a cross-sectional schematic diagram of a heat exchanger provided in Embodiment 1 of the present utility model;

[0030] Figure 5 This is a schematic diagram of the planar structure of a guide vane provided in Embodiment 1 of this utility model;

[0031] Figure 6 A three-dimensional structural diagram of a guide plate provided in Embodiment 1 of this utility model;

[0032] Figure 7 This is a cross-sectional schematic diagram of a guide plate provided in Embodiment 1 of this utility model;

[0033] Figure 8 This is a schematic diagram of the structure of a heat exchanger provided in Embodiments 2 and 4 of this utility model;

[0034] Figure 9 This is a schematic diagram of the structure of a heat exchanger provided in Embodiments 2 and 4 of this utility model, wherein the guide plate is separated from other parts;

[0035] Figure 10This is a schematic diagram of the structure of a heat exchanger provided in Embodiments 2 and 4 of this utility model, wherein the guide plate is separated from other parts;

[0036] Figure 11 This is a schematic diagram of the planar structure of a guide plate provided in Embodiments 2 and 4 of this utility model;

[0037] Figure 12 A three-dimensional structural diagram of a guide plate provided in Embodiments 2 and 4 of this utility model;

[0038] Figure 13 This is a cross-sectional schematic diagram of a guide plate provided in Embodiments 2 and 4 of this utility model;

[0039] Figure 14 This is a schematic diagram of the structure of a heat exchanger provided in Embodiment 3 of this utility model.

[0040] Explanation of reference numerals in the attached figures:

[0041] Heat exchanger 1, terminal heat exchange layer 101, finned heat exchange layer 110, tube heat exchange layer 120, bare tube 121, corrugated tube 122, side plate 200, guide plate 300, flue gas outlet 310, tube body receiving space 320, drain groove 330, drain outlet 331, overlapping part 340, vertical wall 341, horizontal wall 342, sleeve part 350, first vertical section 351, horizontal section 352, second vertical section 353, sleeve hole 354, extension plate 360, spacing X, flue gas flow direction F, condensate W. Detailed Implementation

[0042] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0043] Example 1

[0044] This embodiment provides a heat exchanger 1, such as Figures 1-7 As shown, the heat exchanger 1 includes at least one heat exchange layer arranged along the flue gas flow direction F. In the at least one heat exchange layer, a guide plate 300 with a flue gas outlet 310 is provided downstream of the downstream end heat exchange layer 101. The guide plate 300 and the end heat exchange layer 101 are spaced apart in the flue gas flow direction F. The flue gas flows to the end heat exchange layer 101, passes through the space between the end heat exchange layer 101 and the guide plate 300, and is discharged through the flue gas outlet 310.

[0045] A baffle plate 300 is installed downstream of the terminal heat exchange layer 101. The baffle plate 300 slows down the flow of flue gas out of the heat exchanger 1, allowing the flue gas to fully exchange heat with the terminal heat exchange layer 101. This reduces the heat exchange capacity requirements of the terminal heat exchange layer 101 itself, thus reducing the amount of material used in the terminal heat exchange layer 101 and lowering costs. Furthermore, the baffle plate 300 has a flue gas outlet 310, which allows the flue gas to be discharged smoothly. Therefore, this solution reduces the amount of material used in the terminal heat exchange layer 101 while maintaining heat storage performance through the baffle plate 300.

[0046] In a gas water heater, the heat exchanger 1 is typically arranged horizontally, while the flue gas flows from bottom to top in a generally vertical direction. The heat exchanger 1 usually comprises two or more heat exchange layers, such as... Figure 1-4 The heat exchanger 1 shown includes two heat exchange layers, which are arranged sequentially along the vertical direction. The heat exchange layer located at the downstream end of the flue gas flow direction F is... Figure 1-4 The heat exchange layer located at the top is the end heat exchange layer 101.

[0047] The heat exchange layer of heat exchanger 1 can be configured in different types. In specific implementations, the heat exchange layer includes at least one of a finned heat exchange layer 110 and a tube heat exchange layer 120, wherein the finned heat exchange layer 110 is formed by multiple finned heat exchange tubes. Figure 1 , Figure 2 and Figure 3 As shown, the heat exchange layer located upstream and below the flue gas flow direction F is the finned heat exchange layer 110, and the topmost heat exchange layer is the tube heat exchange layer 120. Compared to the finned heat exchange layer 110, the tube heat exchange layer 120 does not require fins. Therefore, for the original two heat exchange layers, both of which are finned heat exchange layers 110, in this embodiment, configuring the downstream heat exchange layer as the tube heat exchange layer 120 can halve the number of fins, thereby reducing fin costs. Furthermore, only fins need to be welded to the finned heat exchange layer 110, which can also effectively reduce welding costs, thereby reducing the overall cost of the heat exchanger 1. At the same time, the guide plate 300 can condense the flue gas, allowing the flue gas to flow closely along the tube of the end heat exchange layer 101, improving the heat exchange efficiency of the tube heat exchange layer 120. Thus, the heat exchanger 1 can maintain good heat exchange efficiency while reducing costs.

[0048] like Figures 1-4As shown, the terminal heat exchange layer 101 is a tube heat exchange layer 120 comprising multiple tubes. The guide plate 300 has multiple tube receiving spaces 320, the internal shape of which matches the outer shape of the tubes in the terminal heat exchange layer 101. The tube receiving spaces 320 cover the tubes and correspond one-to-one with the tubes in the terminal heat exchange layer 101. The tube receiving spaces 320 of the guide plate 300 match the tubes in the terminal heat exchange layer 101 and cover the tubes, thereby making the size of the space between the tube receiving spaces 320 and the tubes as uniform as possible, and thus ensuring that the heat exchange efficiency of each tube by the guide plate 300 is balanced.

[0049] The tube body includes at least one of a plain tube 121, a corrugated tube 122, a coiled tube, and a corrugated coiled tube. For example... Figure 2 As shown, the tube body is a light tube 121, and its shape is circular; correspondingly, as Figure 7 As shown, the internal shape of the tube-containing space 320 is arc-shaped. When the tube-containing space 320 covers the tube, the distance X between the tube-containing space 320 and the tube is uniform at all points. Figure 3 As shown, the tube body is a corrugated tube 122, and the internal shape of the tube body accommodating space 320 is also corrugated (not shown in the figure).

[0050] In practical implementation, the pipe-containing space 320 is installed over the upper half of the pipe body, such as... Figure 4 As shown, the tube body is a light tube 121, the internal shape of the tube body containing space 320 is semi-circular, and the guide plate 300 is covered on the upper half of the tube body.

[0051] The distance X between the tube body and the tube body accommodating space 320 ranges from 1mm to 6mm. This distance X range is beneficial for achieving a balance between the heat exchange efficiency and flue gas resistance of the heat exchanger 1.

[0052] like Figure 5 , Figure 6 and Figure 7 As shown, the smoke outlet 310 is located at the top of the pipe body receiving space 320 and is directly opposite the central axis of the pipe body. Figure 4 As shown, this design ensures a balanced movement path of the flue gas on both sides of the central axis of the tube, optimizing the overall heat exchange effect of the tube. The shape of the flue gas outlet 310 can be configured according to requirements, such as a circular hole, an elongated hole, a rectangular hole, etc.

[0053] The number of smoke outlets 310 can also be configured according to requirements, such as the required smoke exhaust resistance. Figure 5 , Figure 6 and Figure 7As shown, the pipe body receiving space 320 has multiple smoke outlets 310, which are evenly arranged along the axial direction of the pipe body. In other embodiments, the smoke outlets 310 may also be a single elongated hole.

[0054] In practical implementation, the area of ​​a single smoke outlet 310 is 7 mm. 2 ~180mm 2 Alternatively, the smoke outlet 310 is a circular hole, with the diameter of a single circular hole ranging from 3mm to 15mm.

[0055] A drain outlet 331 is provided between the accommodating spaces 320 of two adjacent pipe bodies. When condensate W accumulates on the upper surface of the guide plate 300, it can flow out through the drain outlet 331, thereby preventing large-area accumulation of condensate W from easily flowing back from the exhaust port, affecting the exhaust and combustion efficiency. Specifically, the drain outlet 331 includes at least one of circular and elongated shapes. Figure 5 As shown, a schematic diagram of the elongated shape of the drain outlet 331 is presented.

[0056] In practical implementation, the area of ​​a single drain outlet 331 is 7 mm. 2 ~180mm 2 Alternatively, the drain outlet 331 is a circular hole, with the diameter of a single circular hole ranging from 3mm to 15mm.

[0057] like Figure 6 and Figure 7 As shown, the pipe-body receiving space 320 protrudes in the flue gas flow direction F, and a downwardly recessed drainage groove 330 is formed between two adjacent pipe-body receiving spaces 320. A drainage outlet 331 is located at the bottom of the drainage groove 330. The pipe-body receiving space 320 protruding in the flue gas flow direction F forms a convex shape on the upper surface of the guide plate 300, thereby facilitating the downward flow of condensate W along the convexity into the drainage groove 330, and its discharge through the drainage outlet 331 located at the bottom of the groove. Figure 6 As shown, a single drainage tank 330 may be provided with multiple drainage outlets 331 at intervals.

[0058] like Figures 1-3 , Figures 5-7 As shown, the guide plate 300 also has two overlapping portions 340 disposed at both ends of the tube body receiving space 320, and the two overlapping portions 340 are respectively connected to the two side plates 200 of the heat exchanger 1. The guide plate 300 overlaps the side plates 200 of the heat exchanger 1 through its overlapping portions 340, and the two ends of the guide plate 300 can be restricted by the two side plates 200 of the heat exchanger 1, thereby making the installation reliable and also facilitating the formation of a gap space between the guide plate 300 and the end heat exchange layer 101. In specific implementation, after the entire heat exchanger 1 assembly is installed, the guide plate 300 can be pressed securely.

[0059] like Figure 6 and Figure 7 As shown, the overlapping portion 340 includes a vertical wall 341 and a horizontal wall 342. The vertical wall 341 is connected to the end of the tube receiving space 320 and extends upward; the horizontal wall 342 is connected to the extended end of the vertical wall 341 and overlaps to the upper surface of the side plate 200. The overlapping portion 340 forms an inverted L-shaped structure, thereby enabling installation using the existing side plate 200 of the heat exchanger 1.

[0060] like Figures 1-7 As shown, there is one guide plate 300, which extends from one end of the end heat exchange layer 101 to the other end along the length direction of the end heat exchange layer 101.

[0061] Example 2

[0062] This embodiment provides a heat exchanger 1, such as Figures 8-13 As shown, the basic structure of heat exchanger 1 is consistent with that of heat exchanger 1 in embodiment 1. The difference is that in this embodiment, the guide plate 300 has two sleeve portions 350 disposed at both ends of the tube body receiving space 320. The sleeve portions 350 have sleeve holes 354, which are sleeved onto the tube body of the end heat exchange layer 101. By sleeved onto the tube body of the end heat exchange layer 101 through the sleeve holes 354 of the sleeve portions 350, the concentric arrangement of the guide plate 300 and the tube body of the end heat exchange layer 101 can be ensured to the greatest extent, so that the distance X between the guide plate 300 and the end heat exchange layer 101 is as consistent as possible. This is beneficial to ensuring heat exchange efficiency and can also ensure stable and consistent product performance during mass production. In specific implementation, the sleeve holes 354 can be as follows: Figure 9 , Figure 10 , Figure 12 and Figure 13 The through hole shown can also be a flanged hole.

[0063] like Figure 12 and Figure 13 As shown, the sleeve portion 350 includes a first vertical section 351, a horizontal section 352, and a second vertical section 353. The first vertical section 351 is connected to the end of the tube body receiving space 320 and extends upward. The horizontal section 352 is connected to the extended end of the first vertical section 351 and extends horizontally. The second vertical section 353 is connected to the extended end of the horizontal section 352 and extends downward. The sleeve hole 354 is provided in the second vertical section 353.

[0064] In addition, such as Figure 11 As shown, in this embodiment, the drain outlet 331 can be configured as circular.

[0065] Example 3

[0066] This embodiment provides a heat exchanger 1, the structure of which is basically the same as that of the heat exchanger 1 in embodiment 1 or 2. The difference lies in that there are multiple guide vanes 300 in this embodiment. Taking the basic structure of the heat exchanger 1 in this embodiment as being the same as that in embodiment 2 as an example, such as... Figure 14 As shown, multiple guide plates 300 are arranged sequentially along the length of the end heat exchange layer 101. Specifically, there are two guide plates 300, which are respectively fitted onto the tube body of the end heat exchange layer 101 through the fitting holes 354 of their respective fitting portions.

[0067] Example 4

[0068] This embodiment provides a heat exchanger 1, the structure of which is basically the same as that of the heat exchanger 1 in embodiments 1-3. The difference is that the guide plate 300 has downwardly extending extension plates 360 at both ends in the width direction. The extension plates 360 are beneficial for gathering flue gas and improving the heat exchange effect between the flue gas and the end heat exchange layer 101.

[0069] Specifically, such as Figure 9 , Figure 10 , Figure 12 and Figure 13 As shown, the guide vane 300 has extension plates 360 extending vertically at both ends in the width direction. Figure 8 As shown, the extension plate 360 ​​can extend to a position between the end heat exchange layer 101 and the heat exchange layer adjacent to the end heat exchange layer 101 below it.

[0070] Example 5

[0071] This embodiment provides a gas water heater, which includes a heat exchanger 1 as described in any of embodiments 1-4.

[0072] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A heat exchanger, characterized in that, The heat exchanger includes at least one heat exchange layer arranged along the flue gas flow direction, wherein a guide plate with a flue gas outlet is provided downstream of the most downstream end heat exchange layer. The guide plate and the end heat exchange layer are spaced apart in the direction of flue gas flow. The flue gas flows toward the end heat exchange layer, passes through the space between the end heat exchange layer and the guide plate, and is discharged through the flue gas outlet.

2. The heat exchanger as claimed in claim 1, characterized in that, The terminal heat exchange layer is a tube heat exchange layer comprising multiple tubes. The guide plate has multiple tube accommodating spaces, and the internal shape of the tube accommodating space matches the external shape of the tube of the terminal heat exchange layer. The tube accommodating space covers the tube and corresponds one-to-one with the tube of the terminal heat exchange layer.

3. The heat exchanger as described in claim 2, characterized in that, The smoke outlet is located at the top of the pipe body's accommodating space and is directly opposite the central axis of the pipe body.

4. The heat exchanger as described in claim 3, characterized in that, The pipe body has a plurality of smoke outlets, which are evenly arranged along the axial direction of the pipe body.

5. The heat exchanger as described in claim 2, characterized in that, The distance between the tube body and the space containing the tube body ranges from 1mm to 6mm.

6. The heat exchanger as claimed in claim 1, characterized in that, The area of ​​a single smoke outlet is 7 mm. 2 ~180mm 2 ; Alternatively, the smoke outlet is a circular hole, with the diameter of a single circular hole ranging from 3mm to 15mm.

7. The heat exchanger as claimed in claim 2, characterized in that, A drain outlet is provided between the two adjacent pipe body accommodating spaces.

8. The heat exchanger as claimed in claim 7, characterized in that, The drain outlet includes at least one of circular and elongated shapes.

9. The heat exchanger as claimed in claim 7, characterized in that, The area of ​​a single drain outlet is 7 mm. 2 ~180mm 2 ; Alternatively, the drain outlet is a circular hole, with the diameter of a single circular hole ranging from 3mm to 15mm.

10. The heat exchanger as claimed in claim 7, characterized in that, The pipe body convexes in the direction of flue gas flow, and a downwardly recessed drainage groove is formed between two adjacent pipe body accommodating spaces. The drainage outlet is located at the bottom of the drainage groove.

11. The heat exchanger as claimed in claim 2, characterized in that, The guide plate also has two overlapping portions disposed at both ends of the tube body receiving space, and the two overlapping portions are respectively connected to the two side plates of the heat exchanger.

12. The heat exchanger as claimed in claim 11, characterized in that, The overlapping portion includes a vertical wall and a horizontal wall. The vertical wall is connected to the end of the tube body receiving space and extends upward. The horizontal wall is connected to the extended end of the vertical wall and overlaps to the upper surface of the side plate.

13. The heat exchanger as claimed in claim 2, characterized in that, The guide plate also has two sleeve portions disposed at both ends of the tube body receiving space, each sleeve portion having a sleeve hole, the sleeve hole being sleeved onto the tube body of the end heat exchange layer.

14. The heat exchanger as claimed in claim 13, characterized in that, The sleeve portion includes a first vertical section, a horizontal section, and a second vertical section. The first vertical section is connected to the end of the tube body accommodating space and extends upward. The horizontal section is connected to the extended end of the first vertical section and extends horizontally. The second vertical section is connected to the extended end of the horizontal section and extends downward. The sleeve hole is provided in the second vertical section.

15. The heat exchanger as claimed in claim 1, characterized in that, The guide plate has downwardly extending extension plates at both ends in the width direction.

16. The heat exchanger as claimed in claim 1, characterized in that, The guide plate is one, and the guide plate extends from one end of the end heat exchange layer to the other end along the length direction of the end heat exchange layer. Alternatively, there may be multiple guide plates, which are arranged sequentially along the length of the end heat exchange layer.

17. The heat exchanger according to any one of claims 1-16, characterized in that, The tube body of the end heat exchange layer includes at least one of a bare tube, a corrugated tube, a coiled tube, and a corrugated coiled tube.

18. A gas-fired water heater, characterized in that, The gas water heater includes a heat exchanger as described in any one of claims 1-17.

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