Heat exchangers and gas water heaters

Abstract

This utility model discloses a heat exchanger and a gas water heater, relating to the field of gas water heater technology. The heat exchanger includes multiple heat exchange plates, multiple heat exchange tubes, and multiple connecting pipes. The heat exchange plates are stacked, each including a plate body with multiple flue gas flow holes and multiple heat exchange tube holes. The heat exchange tubes pass through corresponding heat exchange tube holes, and the connecting pipes connect to the ends of the heat exchange tubes, forming a series pipeline. The flue gas flow holes are spaced apart circumferentially around the heat exchange tube holes, and the flue gas flow holes between adjacent heat exchange plates are interconnected, forming multiple flue gas flow channels around the heat exchange tube holes. These channels are spaced apart from the heat exchange tubes, allowing most of the high-temperature flue gas to pass through the axial direction of the flow holes, parallel to and spaced apart from the flow direction of the cold water in the heat exchange tubes. This reduces the likelihood of direct contact between the flue gas and the heat exchange tubes, thus lowering the probability of condensation and extending the service life of the heat exchanger.

Description

Technical Field

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

[0002] When a gas water heater is working, the burner burns gas in the combustion chamber to heat the water flowing through the heat exchanger, thus providing hot water to the user.

[0003] The heat exchanger includes heat exchange plates, each with multiple heat exchange tube holes and airflow guide holes. The heat exchange tubes are installed within these holes, and the ends of adjacent tubes are connected via connecting pipes, forming a series connection. The walls of the airflow guide holes protrude to one side, forming a raised wall. The heat exchange tube holes are arranged in two parallel rows, staggered longitudinally. Two rows of airflow guide holes are also provided, located above and below the upper row of heat exchange tube holes, respectively. High-temperature flue gas generated during combustion in the combustion chamber enters the heat exchanger and, as it flows upwards, effectively exchanges heat with the water in the lower row of heat exchange tubes. Furthermore, guided by the raised walls of the airflow guide holes, it also effectively exchanges heat with the water in the upper row of heat exchange tubes, thus improving heat exchange efficiency. In the above scheme, the high-temperature flue gas flows along the axis perpendicular to the heat exchange tube hole. Most of the high-temperature flue gas directly contacts the heat exchange tubes that pass through the heat exchange tube hole for heat exchange. Since the temperature of the high-temperature flue gas is high at this time, the temperature difference between it and the cold water in the heat exchange tube is large, and condensation is easily generated on the heat exchange tube. The condensation is acidic and will corrode the heat exchange fins and heat exchange tubes, causing the heat exchanger to leak and affecting the service life of the heat exchanger. Utility Model Content

[0004] The first technical problem solved by this utility model is to provide a heat exchanger that can effectively solve the problem of condensation on the heat exchange tubes in existing heat exchangers; thus achieving the goal of reducing the generation of condensation in the heat exchanger and extending the service life of the heat exchanger.

[0005] The second technical problem solved by this utility model is to provide a gas water heater that can solve the problem of easy water leakage in the heat exchanger in the prior art; thus achieving the purpose of reducing water leakage in the heat exchanger and extending the service life of the heat exchanger.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A heat exchanger includes multiple heat exchange plates, multiple heat exchange tubes, and multiple connecting pipes. The heat exchange plates are stacked. Each heat exchange plate includes a plate body with multiple flue gas flow holes and multiple heat exchange tube holes. The heat exchange tubes are arranged one-to-one with the heat exchange tube holes, and each heat exchange tube passes through a corresponding heat exchange tube hole. The connecting pipes are connected to the ends of the heat exchange tubes, forming a series pipeline. The flue gas flow holes are spaced apart circumferentially from the heat exchange tube holes, and the flue gas flow holes between adjacent heat exchange plates are interconnected, forming multiple flue gas flow channels circumferentially from the heat exchange tube holes.

[0008] The heat exchanger described in this utility model has the following advantages compared with the prior art:

[0009] The heat exchanger provided by this utility model allows high-temperature flue gas generated in the combustion chamber to enter the heat exchanger and pass through multiple flue gas flow channels formed by the flue gas flow holes between adjacent heat exchange plates. These multiple flue gas flow channels are spaced apart from the heat exchange tubes that pass through the heat exchange tube holes. This means that most of the high-temperature flue gas passes through the flue gas flow holes axially, parallel to the direction of cold water flow in the heat exchange tubes, and spaced apart. This makes it less likely for the flue gas to come into direct contact with the heat exchange tubes, thereby reducing the probability of condensation and thus reducing the probability of corrosion of the heat exchange plates and heat exchange tubes by condensation, extending the service life of the heat exchanger.

[0010] In one embodiment, the flue gas flow holes on the plurality of heat exchange plates are coaxially arranged in a one-to-one correspondence, and the flue gas flow holes located on the same axis are connected to form the flue gas flow channel.

[0011] In one embodiment, the wall of the flue gas flow hole protrudes from one or both sides of the heat exchange plate body along the thickness direction to form a flue gas heat exchange sleeve.

[0012] In one embodiment, the wall of the heat exchange tube hole protrudes from one or both sides of the heat exchange plate body along the thickness direction to form a support sleeve, and the support sleeve is in contact with the heat exchange tube.

[0013] In one embodiment, the heat exchange plate body is provided with a flange in the circumferential direction.

[0014] In one embodiment, the height of the flange is d1, the height of the flue gas heat exchange sleeve is d2, and the height of the support sleeve is d3, then d1 > d2 and d1 > d3.

[0015] In one embodiment, the spacing between adjacent heat exchange fins is greater than or equal to the height of the flue gas heat exchange sleeve.

[0016] In one embodiment, the minimum distance between the heat exchange tube hole and the flue gas flow hole is 1.5 to 5 times the distance between adjacent heat exchange plates.

[0017] In one embodiment, the total circumference of the flue gas flow holes on the heat exchange plate body is 2 to 20 times the total circumference of the heat exchange tube holes.

[0018] In one embodiment, the diameter of the flue gas flow hole is 20% to 80% of the diameter of the heat exchange tube hole.

[0019] The second technical problem mentioned above is solved by the following technical solution:

[0020] A gas water heater, which includes a heat exchanger as described in any of the above embodiments.

[0021] The gas water heater described in this utility model has the following advantages compared with the prior art:

[0022] The gas water heater provided by this utility model, by using the above-mentioned heat exchanger, can reduce the probability of condensate corrosion of the heat exchange tubes and heat exchange plates, thereby reducing the probability of gas water heater leakage and extending the service life of the heat exchanger. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a heat exchanger with heat exchange plates without flue gas heat exchange sleeves provided in a specific embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the heat exchange plate without a flue gas heat exchange sleeve provided in a specific embodiment of this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of a heat exchanger with a flue gas heat exchange sleeve provided in a specific embodiment of this utility model;

[0027] Figure 4 This is a cross-sectional view of a heat exchanger with a flue gas heat exchange sleeve installed on the heat exchange fins, according to a specific embodiment of this utility model.

[0028] Figure 5This is a schematic diagram of the structure of the heat exchange plate with flue gas heat exchange sleeve provided in a specific embodiment of this utility model;

[0029] Figure 6 This is a side sectional view of the heat exchange fins of the flue gas heat exchange sleeve provided in a specific embodiment of this utility model.

[0030] Figure 7 This is a side sectional view of a heat exchanger with heat exchange plates and flue gas heat exchange sleeves provided in a specific embodiment of this utility model.

[0031] In the picture:

[0032] 100. Water flow direction; 200. Airflow direction; 300. Flue gas flow channel;

[0033] 1. Heat exchanger fins; 11. Heat exchanger fin body; 12. Flanged edge;

[0034] 2. Flue gas flow holes; 21. Flue gas heat exchange sleeve;

[0035] 3. Heat exchanger tube holes; 31. Support sleeve; 32. Bending plate;

[0036] 4. Series piping; 41. Heat exchange tubes; 42. Connecting pipes;

[0037] 5. Breathing components. Detailed Implementation

[0038] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] This embodiment provides a gas water heater, including a burner and a heat exchanger. The heat exchanger is located above the burner. The high-temperature flue gas generated by the burner combustion in the combustion chamber flows to the heat exchanger to heat the cold water in the heat exchanger so as to provide hot water to the user.

[0041] like Figures 1-5As shown, this embodiment also provides a heat exchanger, including multiple heat exchange tubes 41, multiple connecting pipes 42, and multiple heat exchange plates 1. The multiple heat exchange plates 1 are stacked and arranged. Each heat exchange plate 1 includes a heat exchange plate body 11, on which multiple flue gas flow holes 2 and multiple heat exchange tube holes 3 are formed. The multiple heat exchange tubes 41 are arranged one-to-one with the multiple heat exchange tube holes 3, and the heat exchange tubes 41 pass through the corresponding heat exchange tube holes 3. The connecting pipes 42 are connected to the ends of the heat exchange tubes 41, so that the multiple heat exchange tubes 41 form a series pipeline 4. The heat exchange tubes 41 are straight pipes, and the connecting pipes 42 are bent pipes used to connect the ends of two adjacent heat exchange tubes 41.

[0042] Specifically, the heat exchange tube holes 3 are arranged in two rows, which are staggered longitudinally. The diameter of the heat exchange tube holes 3 is the same. One row has two heat exchange tube holes 3, and the other row has three heat exchange tube holes 3. The series pipeline 4 includes five heat exchange tubes 41 and four connecting pipes 42. After multiple heat exchange plates 1 are stacked, the heat exchange tubes 41 pass through the corresponding heat exchange tube holes 3 of the multiple heat exchange plates 1 in sequence. The connecting pipes 42 are used to connect two adjacent heat exchange tubes 41 in different rows to connect the five heat exchange tubes 41. In the row with three heat exchange tube holes 3, among the two heat exchange tubes 41 that pass through the heat exchange tube holes 3 at both ends of the row, one heat exchange tube 41 has a cold water inlet and the other heat exchange tube 41 has a hot water outlet.

[0043] In related technologies, after entering the heat exchanger, the high-temperature flue gas flows upward through the heat exchange plate 1 and through the flue gas flow hole 2 between adjacent heat exchange plates 1 to exchange heat with the cold water in the series pipe 4. However, during the upward flow of the high-temperature flue gas, the high-temperature flue gas flows in a direction perpendicular to the heat exchange tube 41 and will come into direct contact with the heat exchange tube 41. Due to the large temperature difference between the high-temperature flue gas and the cold water in the heat exchange tube 41, condensate is easily generated. The condensate is acidic and will corrode the heat exchange tube 41 and the heat exchange plate 1, causing the heat exchanger to leak and affecting its service life.

[0044] To solve the above technical problems, such as Figure 1 , Figure 2 and Figure 7As shown, in this embodiment, the heat exchanger has flue gas flow holes 2 spaced apart around the heat exchange tube holes 3. The flue gas flow holes 2 between two adjacent heat exchange plates 1 are connected, forming multiple flue gas flow channels 300 around the heat exchange tube holes 3 for flue gas flow. After the high-temperature flue gas generated in the combustion chamber enters the heat exchanger, it passes through the stacked heat exchange plates 1 via the multiple flue gas flow channels 300. Each of the multiple flue gas flow channels 300 has a certain distance from the heat exchange tube 41, meaning that most of the high-temperature flue gas passes through the axial direction of the flue gas flow holes 2, parallel to the flow direction of the cold water in the heat exchange tube 41 and spaced apart, making it difficult for it to directly contact the heat exchange tube 41. The high-temperature flue gas exchanges heat with the water flow in the heat exchange tube 41 through the heat exchange plate body 11. During the flow of high-temperature flue gas along the flue gas flow channel 300, heat exchange occurs between the heat exchange plate body 11 and the cold water inside the heat exchange tube 41. This process transfers the heat from the high-temperature flue gas to the cold water inside the heat exchange tube 41, thus heating the water. In this heat exchange method, most of the high-temperature flue gas does not directly contact the heat exchange tube 41, thereby reducing the probability of condensation and further reducing the probability of corrosion of the heat exchange plate 1 and the heat exchange tube 41 by condensation, thus extending the service life of the heat exchanger.

[0045] Specifically, the heat exchange tube hole 3 is adapted to the outer peripheral wall of the heat exchange tube 41, and the flue gas flow hole 2 can be a circular hole, an elliptical hole, or a polygonal hole. Preferably, the flue gas flow hole 2 is set as a circular hole, so that the resistance of the flue gas when passing through the flue gas flow hole 2 is minimized, thereby improving the heat exchange efficiency.

[0046] In one embodiment, the flue gas flow holes 2 on a plurality of heat exchange plates 1 are coaxially arranged in a one-to-one correspondence. The flue gas flow holes 2 located on the same axis are connected to form a flue gas flow channel 300. The axis of the flue gas flow channel 300 is parallel to the axis of the heat exchange tube 41. The airflow direction 200 in the flue gas flow channel 300 is the same as or opposite to the water flow direction 100 in the heat exchange tube 41. With this arrangement, when the flue gas flows between adjacent heat exchange plates 1, the flow path is straight, which reduces the probability of the flue gas contacting the heat exchange tube 41 when it flows around between adjacent heat exchange plates 1.

[0047] In one embodiment, such as Figures 3-5 As shown, the wall of the flue gas flow hole 2 protrudes from one or both sides of the heat exchange plate body 11 along the thickness direction to form a flue gas heat exchange sleeve 21. During flue gas flow, it directly contacts the wall of the flue gas flow hole 2 for heat exchange. The wall of the flue gas flow hole 2 is integrally formed with the heat exchange plate body 11, thereby achieving heat exchange between the flue gas flow channel 300 and the heat exchange plate body 11. The arrangement of the flue gas heat exchange sleeve 21 ensures that the flue gas contacts the inner wall of the flue gas heat exchange sleeve 21 during flow, relatively... Figure 1 and Figure 2The medium- and high-temperature flue gas only contacts the wall of the flue gas flow hole 2, which increases the heat exchange area between the high-temperature flue gas and the heat exchange plate body 11 and improves the heat exchange efficiency. At the same time, it enhances the guidance of the flow direction of the high-temperature flue gas between the heat exchange plates 1, reducing the probability that the high-temperature flue gas will undergo excessive flow around the heat exchange plates 1 and come into contact with the heat exchange tube 41 to generate condensate.

[0048] In one embodiment, the wall of the heat exchange tube hole 3 protrudes from one or both sides of the heat exchange plate body 11 along the thickness direction to form a support sleeve 31, which contacts the heat exchange tube 41. Heat from the heat exchange plate body 11 is transferred to the wall of the heat exchange tube hole 3, and the wall of the heat exchange tube hole 3 contacts the heat exchange tube 41 for heat exchange. The heat exchange tube 41 then exchanges heat with the cold water inside it, thus achieving heat exchange between the heat exchange plate body 11 and the cold water inside the heat exchange tube 41. Similarly, the provision of the support sleeve 31 allows the heat exchange tube 41 to contact the inner wall of the support sleeve 31, increasing the heat exchange area between the heat exchange plate body 11 and the cold water inside the heat exchange tube 41, thereby improving heat exchange efficiency.

[0049] Meanwhile, the support sleeve 31 also supports the heat exchange tube 41. Bending pieces 32 are circumferentially spaced at the end of the support sleeve 31. After the heat exchange tube 41 passes through the support sleeve 31, the bending pieces 32 are bent towards the heat exchange tube 41 so that they abut against the outer wall of the heat exchange tube 41 to fix the heat exchange tube 41.

[0050] Specifically, the flue gas heat exchange sleeve 21 is formed by stamping the flue gas flow hole 2 on the heat exchange plate body 11, and the support sleeve 31 is formed by stamping the heat exchange tube hole 3 on the heat exchange plate body 11. This arrangement not only simplifies the processing steps, but also speeds up the heat transfer.

[0051] In this embodiment, the support sleeve 31 protrudes from one side of the heat exchanger body 11 along the thickness direction, and the flue gas heat exchange sleeve 21 protrudes from one side of the heat exchanger body 11 along the thickness direction, with the support sleeve 31 and the flue gas heat exchange sleeve 21 located on the same side of the heat exchanger body 11. In other embodiments, the support sleeve 31 and the flue gas heat exchange sleeve 21 may also be located on different sides of the heat exchanger body 11; or the flue gas heat exchange sleeve 21 may also be located on both sides of the heat exchanger body 11.

[0052] In other embodiments, the flue gas flow holes 2 staggered between adjacent heat exchange plates 1 can be connected to form a flue gas flow channel 300, and the flue gas heat exchange sleeve 21 can be set as a curved flue gas heat exchange sleeve 21 connected to the staggered flue gas flow holes 2, so as to prevent the high-temperature flue gas between adjacent heat exchange plates 1 from flowing around and directly contacting the heat exchange tube 41.

[0053] In one embodiment, the diameter of the flue gas flow hole 2 is 20% to 80% of the diameter of the heat exchange tube hole 3. The diameter of the heat exchange tube hole 3 is equal to the outer diameter of the heat exchange tube 41. The diameter of the flue gas flow hole 2 should not be too large. If the diameter of the flue gas flow hole 2 is too large, the flue gas will not easily contact the hole wall of the flue gas flow hole 2 and the inner wall of the flue gas heat exchange sleeve 21 when passing through the flue gas flow hole 2, which will reduce the heat exchange efficiency between the high-temperature flue gas and the heat exchange plate body 11. The diameter of the flue gas flow hole 2 should also not be too small. If the diameter of the flue gas flow hole 2 is too small, the flow resistance of the flue gas will increase.

[0054] In one embodiment, the diameter of the flue gas flow hole 2 is 4 mm to 10 mm.

[0055] In one embodiment, the heat exchanger body 11 is provided with a flange 12 around its circumference. By providing a flange 12 around the circumference of the heat exchanger body 11, after the heat exchanger 1s are stacked, the flange 12 around the circumference of the heat exchanger body 11 can prevent the flue gas from overflowing between adjacent heat exchanger 1s, prevent heat loss from affecting the heat exchange efficiency, and at the same time increase the strength of the heat exchanger 1s.

[0056] In one embodiment, such as Figure 6 As shown, the height of the flange 12 is d1, the height of the flue gas heat exchange sleeve 21 is d2, and the height of the support sleeve 31 is d3. Therefore, d1 > d2 and d1 > d3. The heights of the flue gas heat exchange sleeve 21 and the support sleeve 31 are both less than the height of the flange 12, which ensures the sealing between adjacent heat exchange plates 1, prevents high-temperature flue gas from overflowing and causing heat loss, increases the heat exchange area between the high-temperature flue gas and the heat exchange plate body 11, and increases the strength of the heat exchange plate 1 while the water flows through the heat exchange tube 41 and the heat exchange plate body 11.

[0057] In one embodiment, the spacing between adjacent heat exchange plates 1 is greater than or equal to the height of the flue gas heat exchange sleeve 21. This arrangement maximizes the heat exchange efficiency between the high-temperature flue gas and the heat exchange plate body 11. When the spacing between adjacent heat exchange plates 1 is greater than the height of the flue gas heat exchange sleeve 21, the flue gas flow channel 300 is not a closed channel. However, the high-temperature flue gas flowing between the heat exchange plates 1 will be guided by the flue gas heat exchange sleeve 21 into the flue gas flow hole 2 on the next heat exchange plate body 11. Although there is a gap between the flue gas heat exchange sleeve 21 and the next heat exchange plate body 11, the flue gas flow is relatively small, making it difficult for the flue gas to directly contact the heat exchange tube 41. Furthermore, the flanges 12 around the heat exchange plate body 11 are greater than the height of the flue gas heat exchange sleeve 21, which will prevent the high-temperature flue gas from overflowing. When the interval between adjacent heat exchange plates 1 is equal to the height of the flue gas heat exchange sleeve 21, the flue gas heat exchange sleeve 21 on the previous heat exchange plate body 11 abuts against the next heat exchange plate body 11, forming a closed flue gas flow channel 300. The high-temperature flue gas flows in the closed flue gas flow channel 300 and will not come into direct contact with the heat exchange tube 41, thus more effectively avoiding the generation of condensate.

[0058] For example, the diameter of the flue gas flow hole 2 is preferably 7 mm, the height of the flue gas heat exchange sleeve 21 is 3.1 mm, and the spacing between adjacent heat exchange plates 1 is greater than or equal to 3.1 mm.

[0059] In one embodiment, the minimum distance between the heat exchange tube hole 3 and the flue gas flow hole 2 is 1.5 to 5 times the distance between adjacent heat exchange plates 1. When the flue gas heat exchange sleeve 21 is not provided or the height of the flue gas heat exchange sleeve 21 is less than the distance between adjacent heat exchange plates 1, the high-temperature flue gas will flow around the outer periphery of the flue gas flow hole 2 when it enters the space between adjacent heat exchange plates 1 through the flue gas flow hole 2. The sufficiently small distance between the heat exchange plates 1 can prevent the high-temperature flue gas from flowing around too much, and avoid the high-temperature flue gas passing through the flue gas flow hole 2 closest to the heat exchange tube 41 from directly contacting the heat exchange tube 41 and generating condensate.

[0060] In one embodiment, the total circumference of the flue gas flow holes 2 on the heat exchange plate body 11 is 2 to 20 times the total circumference of the heat exchange tube holes 3. Since the high-temperature flue gas exchanges heat with the hole walls of the flue gas flow holes 2 and the inner wall of the flue gas heat exchange sleeve 21, when the heat exchange plate body 11 is relatively thin, the area of ​​the hole walls of the flue gas flow holes 2 is negligible. The effective heat exchange area between the high-temperature flue gas and the heat exchange plate body 11 = the circumference of the flue gas flow holes 2 × the height of the flue gas heat exchange sleeve 21. Similarly, the water in the heat exchange tube 41 exchanges heat with the hole walls of the heat exchange tube holes 3 and the inner wall of the supporting sleeve 31 through the heat exchange tube 41. When the heat exchange plate body 11 is relatively thin, the area of ​​the hole walls of the heat exchange tube holes 3 is negligible. The effective heat exchange area between the water in the heat exchange tube 41 and the heat exchange plate body 11 through the heat exchange tube 41 = the circumference of the heat exchange tube holes 3 × the height of the supporting sleeve 31. Since the heat exchange efficiency of water is more than 10 times that of flue gas, setting the total circumference of the flue gas flow hole 2 to 20 times the total circumference of the heat exchange tube hole 3 can balance effective heat exchange, improve cost-effectiveness and material utilization.

[0061] In one embodiment, such as Figure 7 As shown, the heat exchanger also includes a flow-deflecting element 5, which is disposed within the flue gas flow channel 300. By turbulenting the flue gas within the flue gas flow channel 300 through the flow-deflecting element 5, the heat exchange intensity and efficiency can be improved.

[0062] Specifically, the turbulence-disrupting element 5 is configured as a spiral blade. The spiral blade is placed in the flue gas flow channel 300 to guide the flow path of the flue gas, which enables the high-temperature flue gas to fully contact the hole wall of the flue gas flow hole 2 and the inner wall of the flue gas heat exchange sleeve 21, thereby improving the heat exchange efficiency.

[0063] The heat exchanger provided in this embodiment uses the aforementioned heat exchange plate 1. During the flow of flue gas along the flue gas flow channel 300, heat exchange occurs between the flue gas and the heat exchange plate body 11. The heat exchange plate body 11 also exchanges heat with the cold water in the heat exchange tube 41, thereby transferring the heat of the high-temperature flue gas to the cold water in the heat exchange tube 41 and heating the cold water. This heat exchange method reduces the probability of high-temperature flue gas directly contacting the heat exchange tube 41, thereby reducing the probability of condensate corrosion of the heat exchange plate 1 and the heat exchange tube 41 and extending the service life of the heat exchanger.

[0064] Gas water heaters using the above-mentioned heat exchanger can reduce the probability of condensation in the heat exchanger, thereby reducing the probability of water leakage and extending the service life of the heat exchanger.

[0065] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A heat exchanger, comprising heat exchange plates (1), a plurality of heat exchange tubes (41), and a plurality of connecting pipes (42), wherein the plurality of heat exchange plates (1) are stacked, each heat exchange plate (1) comprising a heat exchange plate body (11), the heat exchange plate body (11) having a plurality of flue gas flow holes (2) and a plurality of heat exchange tube holes (3), the plurality of heat exchange tubes (41) being arranged one-to-one with the plurality of heat exchange tube holes (3), the heat exchange tubes (41) passing through the corresponding heat exchange tube holes (3), and the connecting pipes (42) being connected to the ends of the heat exchange tubes (41), so that the plurality of heat exchange tubes (41) form a series pipeline (4), characterized in that, The flue gas flow holes (2) are spaced apart in the circumference of the heat exchange tube holes (3), and the flue gas flow holes (2) between two adjacent heat exchange plates (1) are connected to form a plurality of flue gas flow channels (300) for flue gas flow in the circumference of the heat exchange tube holes (3).

2. The heat exchanger of claim 1, wherein The flue gas flow holes (2) on the multiple heat exchange plates (1) are coaxially arranged in a one-to-one correspondence, and the flue gas flow holes (2) located on the same axis are connected to form the flue gas flow channel (300).

3. The heat exchanger of claim 1, wherein The wall of the flue gas flow hole (2) protrudes from one or both sides of the heat exchange plate body (11) along the thickness direction to form a flue gas heat exchange sleeve (21).

4. The heat exchanger of claim 3, wherein The wall of the heat exchange tube hole (3) protrudes from one or both sides of the heat exchange plate body (11) along the thickness direction to form a support sleeve (31), and the support sleeve (31) contacts the heat exchange tube (41).

5. The heat exchanger according to claim 4, characterized in that, The heat exchange plate body (11) is provided with a flange (12) in the circumferential direction.

6. The heat exchanger of claim 5, wherein The height of the flange (12) is d1, the height of the flue gas heat exchange sleeve (21) is d2, and the height of the support sleeve (31) is d3. Then d1 > d2 and d1 > d3.

7. The heat exchanger of claim 3, wherein The distance between adjacent heat exchange plates (1) is greater than or equal to the height of the flue gas heat exchange sleeve (21).

8. The heat exchanger according to any one of claims 1 to 7, characterized in that The minimum distance between the heat exchange tube hole (3) and the flue gas flow hole (2) is 1.5 to 5 times the distance between adjacent heat exchange plates (1).

9. The heat exchanger according to any one of claims 1-7, characterized in that, The total circumference of the flue gas flow hole (2) on the heat exchange plate body (11) is 2 to 20 times the total circumference of the heat exchange tube hole (3).

10. The heat exchanger according to any one of claims 1-7, characterized in that The diameter of the flue gas flow hole (2) is 20% to 80% of the diameter of the heat exchange tube hole (3).

11. The heat exchanger according to any one of claims 1-7, characterized in that The heat exchanger also includes a baffle (5), which is disposed in the flue gas flow channel (300).

12. A gas water heater characterised by, Including the heat exchanger as described in any one of claims 1-11.

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