Heat exchanger and water heater

Abstract

The utility model provides a kind of heat exchanger and water heater, belong to water heater equipment technical field.This heat exchanger includes heat exchanger, heat exchange tube, first water pipe and second water pipe;Heat exchanger is provided with heat exchange tube, heat exchange tube has first interface and second interface, first interface and second interface extend to the outside of heat exchanger;First water pipe is connected with first interface, and first water pipe is communicated with heat exchange tube;Second water pipe is connected with second interface, and second water pipe is communicated with heat exchange tube;Thick film electrothermal element is provided on heat exchanger;When outdoor temperature reduces to certain degree, start thick film electrothermal element, thick film electrothermal element heats heat exchanger, heat exchanger conducts heat to heat exchange tube, heats and warms water in heat exchange tube, effectively avoid the water in heat exchange tube to freeze by continuous cooling, avoid the heat exchange tube in heat exchanger to expand and crack, ensure the service life of heat exchanger.

Description

Technical Field

[0001] This utility model belongs to the technical field of water heater equipment, specifically relating to a heat exchanger and a water heater. Background Technology

[0002] A gas water heater is a gas appliance that uses gas as a combustion material to heat water by transferring heat to a heat exchanger. It features rapid hot water delivery, good temperature stability, and high energy efficiency, making it increasingly popular in modern households.

[0003] However, existing gas water heaters have some problems under extreme weather conditions: In northern regions, winters are long and cold, indoor spaces are generally well-sealed, and outdoor temperatures are low. When the outdoor temperature drops below 0°C and the gas water heater is not in use, the residual water in the heat exchanger can easily reach its freezing point and freeze, causing the heat exchanger pipes to burst. Furthermore, in summer, even when operating at minimum power, the heat output of the water heater still exceeds the heat input required to reach the desired temperature rise at a certain water flow rate. Combined with the high inlet water temperature in summer, the water heated by the water heater is also very hot, severely impacting the user experience. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model provides a heat exchanger. The technical problem to be solved by this utility model is: how to prevent the residual water in the heat exchanger from freezing easily and to prevent the heat exchange tubes in the heat exchanger from bursting.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A heat exchanger, comprising:

[0007] Heat exchanger;

[0008] The heat exchanger is provided with the heat exchange tube, the heat exchange tube having a first interface and a second interface, the first interface and the second interface extending to the outside of the heat exchanger;

[0009] The first water pipe is connected to the first interface and is also connected to the heat exchange pipe.

[0010] The second water pipe is connected to the second interface and is also connected to the heat exchange pipe.

[0011] The heat exchanger is equipped with a thick-film electric heating element.

[0012] In one of the heat exchangers described above, the thick-film heating element is disposed on the outer side of the heat exchanger, and the thick-film heating element covers the entire outer side of the heat exchanger.

[0013] In one of the heat exchangers described above, the heat exchanger includes a first heat exchange plate, a second heat exchange plate, a third heat exchange plate, and a fourth heat exchange plate connected end to end. The first heat exchange plate, the second heat exchange plate, the third heat exchange plate, and the fourth heat exchange plate enclose a heat exchange cavity for accommodating the heat exchange tube.

[0014] In the aforementioned heat exchanger, the upper and lower sides of the first, second, third, and fourth heat exchange plates are all provided with flanges, and the flanges face away from the first, second, third, and fourth heat exchange plates.

[0015] In the aforementioned heat exchanger, the heat exchange tube includes multiple straight pipe sections and multiple connecting pipe sections. The multiple straight pipe sections extend along the length direction of the heat exchanger and are arranged sequentially at intervals along the width direction of the heat exchanger. Each pair of adjacent straight pipe sections are connected and interconnected through the connecting pipe sections.

[0016] In the aforementioned heat exchanger, multiple straight pipe sections are located inside the heat exchange chamber, and multiple connecting pipe sections are located outside the heat exchanger. The two ends of the multiple straight pipe sections pass through the first heat exchange plate and the third heat exchange plate. Among them, one end of the outermost straight pipe section is the first interface or the second interface. The first water pipe is connected to the first interface, and the second water pipe is connected to the second interface. Adjacent straight pipe sections are connected and interconnected through the connecting pipe sections.

[0017] In the aforementioned heat exchanger, both the first heat exchange plate and the third heat exchange plate are provided with pipe holes corresponding to the straight pipe section. The pipe holes are provided with extensions protruding in a direction away from the first heat exchange plate or the third heat exchange plate. The two ends of the straight pipe section are respectively inserted into the pipe holes on the first heat exchange plate and the third heat exchange plate. The connecting pipe section or the first water pipe or the second water pipe abuts against the interior of the extension.

[0018] In the heat exchanger described above, the heat exchange tube further includes a return pipe section, which is disposed on two adjacent connecting pipe sections and is connected to both adjacent connecting pipe sections.

[0019] In one of the heat exchangers described above, a baffle plate is provided inside the straight pipe section. The baffle plate is arranged along the length of the straight pipe section and is spirally arranged.

[0020] In one of the heat exchangers described above, the heat exchanger further includes an antifreeze sensor, which is installed on the heat exchange tube and is used to detect the temperature of the water inside the heat exchange tube. When the temperature detected by the antifreeze sensor is lower than a preset temperature, the thick film heating element is activated for heating, and when the temperature detected by the antifreeze sensor is higher than the preset temperature, the thick film heating element is deactivated.

[0021] The second objective of this utility model is to provide a water heater, and the technical problem to be solved is: how to prevent the heat exchange tubes inside the water heater from bursting and ensure the service life of the water heater.

[0022] A water heater, comprising:

[0023] shell;

[0024] The heat exchanger described above is installed inside the housing.

[0025] The beneficial effects of this utility model are:

[0026] In this embodiment, when the outdoor temperature drops to a certain level, the thick-film electric heating element is activated to heat the heat exchanger. The heat exchanger then conducts the heat to the heat exchange tubes, thereby heating the water inside the tubes. This achieves low-power heating of the heat exchanger to convert electrical energy into hot water, effectively preventing the water inside the heat exchange tubes from continuously cooling and freezing, avoiding the heat exchange tubes from bursting, and ensuring the service life of the heat exchanger.

[0027] In this embodiment, the water heater has a thick-film electric heating element installed on the heat exchanger of the heat exchanger. When the outdoor temperature drops to a certain level, the thick-film electric heating element is activated to heat the heat exchanger, effectively preventing the water in the heat exchange tube from continuously cooling and freezing, thus preventing the heat exchange tube in the heat exchanger from bursting and ensuring the service life and reliability of the water heater. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a heat exchanger.

[0029] Figure 2 A schematic diagram of the heat exchanger from another perspective;

[0030] Figure 3 This is a schematic diagram of the heat exchanger structure;

[0031] Figure 4 This is a schematic diagram of the heat exchange tube structure;

[0032] Figure 5 This is a schematic diagram of the spoiler structure;

[0033] Figure 6 This is a schematic diagram of a water heater.

[0034] In the diagram, 1. Heat exchanger; 11. First heat exchange plate; 12. Second heat exchange plate; 13. Third heat exchange plate; 14. Fourth heat exchange plate; 15. Heat exchange chamber; 16. Flanged edge; 17. Pipe hole; 171. Extension; 2. Heat exchange tube; 21. First interface; 22. Second interface; 23. Straight pipe section; 231. Baffle plate; 24. Connecting pipe section; 25. Return pipe section; 3. First water pipe; 4. Second water pipe; 5. Thick film heating element; 6. Antifreeze sensor; 7. Housing. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0037] Example 1:

[0038] like Figure 1-3 As shown, this heat exchanger includes a heat exchanger 1, a heat exchange tube 2, a first water pipe 3, and a second water pipe 4. The heat exchanger 1 is provided with the heat exchange tube 2, which has a first interface 21 and a second interface 22, extending to the outside of the heat exchanger 1. The first water pipe 3 is connected to the first interface 21 and is in communication with the heat exchange tube 2. The second water pipe 4 is connected to the second interface 22 and is in communication with the heat exchange tube 2. A thick-film electric heating element 5 is provided on the heat exchanger 1.

[0039] It should be noted that the thick film heating element 5 is an existing element with heating function. It is formed by using an electronic paste with resistive electronic function and by screen printing, film lamination, sintering and other processes. The thick film heating element 5 can withstand higher voltage, greater power and large current, has a smaller element size, has an extremely long service life, and provides a more stable output medium for electrothermal technology.

[0040] In this embodiment, the heat exchanger 1 is provided with a heat exchange tube 2, which has a first interface 21 and a second interface 22, extending to the outside of the heat exchanger 1. A first water pipe 3 is connected to the first interface 21 and is in communication with the heat exchange tube 2. A second water pipe 4 is connected to the second interface 22 and is in communication with the heat exchange tube 2. It can be understood that the first interface 21 of the heat exchange tube 2 can be the inlet, and the second interface 22 can be the outlet. Correspondingly, the first water pipe 3 is the inlet pipe for cold water input, and the second water pipe 4 is the outlet pipe for hot water output. Alternatively, if the second interface 22 of the heat exchange tube 2 is the inlet, then the first interface 21 can also be the outlet, and the second water pipe 3... 4 is the inlet pipe, which inputs cold water, and the first water pipe 3 is the outlet pipe, which outputs hot water. In a preferred embodiment, the first interface 21 is the inlet end, the first water pipe 3 is the inlet pipe, the second interface 22 is the outlet end, and the second water pipe 4 is the outlet pipe. Since the heat exchanger 1 is equipped with a thick film electric heating element 5, when the outdoor temperature drops to a certain level, the thick film electric heating element 5 is activated. The thick film electric heating element 5 heats the heat exchanger 1, and the heat exchanger 1 conducts the heat to the heat exchange tube 2, thereby heating the water in the heat exchange tube 2. In this way, the heat exchanger achieves low-power heating and conversion of electrical energy into hot water, effectively preventing the water in the heat exchange tube 2 from continuously cooling and freezing, preventing the heat exchange tube 2 in the heat exchanger from bursting, and ensuring the service life of the heat exchanger 1.

[0041] In addition, since the water temperature entering the heat exchange tube 2 is relatively high when used in summer, the heat exchanger 1 is heated by the output medium of the thick film heating element to compensate for the temperature difference. There is no need to use gas heating, which avoids the high heat output of the output medium such as gas. This effectively avoids the water temperature after being heated by the heat exchanger 1 being too high, greatly improves the summer user experience, and expands the applicability of the heat exchanger 1.

[0042] In one embodiment, both the first water pipe 3 and the second water pipe 4 are made of copper, with an inner diameter of 10.8 mm and a wall thickness of 0.6 mm.

[0043] like Figure 1 and 2 As shown, the thick film heating element 5 is disposed on the outer side of the heat exchanger 1, and the thick film heating element 5 covers the outer side of the heat exchanger 1.

[0044] In this embodiment, the thick film heating element 5 is disposed on the outer side of the heat exchanger 1 and covers the entire outer side of the heat exchanger 1. When the heat exchanger 1 needs to be heated by the thick film heating element 5, since the thick film heating element 5 covers the entire outer side of the heat exchanger 1, the heat generated by the thick film heating element 5 can be quickly transferred to the heat exchanger 1, thereby greatly improving the heating efficiency.

[0045] like Figure 3As shown, the heat exchanger 1 includes a first heat exchange plate 11, a second heat exchange plate 12, a third heat exchange plate 13 and a fourth heat exchange plate 14 connected end to end. The first heat exchange plate 11, the second heat exchange plate 12, the third heat exchange plate 13 and the fourth heat exchange plate 14 enclose a heat exchange cavity 15 for accommodating the heat exchange tube 2.

[0046] In this embodiment, the heat exchanger 1 includes a first heat exchange plate 11, a second heat exchange plate 12, a third heat exchange plate 13, and a fourth heat exchange plate 14 connected end to end. The first heat exchange plate 11, the second heat exchange plate 12, the third heat exchange plate 13, and the fourth heat exchange plate 14 form a frame with openings at the top and bottom, and the inside is a receiving cavity. The heat exchange tube 2 can be installed in the receiving cavity. When it is necessary to heat the water in the heat exchange tube 2, heat is transferred to the first heat exchange plate 11, the second heat exchange plate 12, the third heat exchange plate 13, and the fourth heat exchange plate 14 through the thick film electric heating element 5 or gas or other media. The first heat exchange plate 11, the second heat exchange plate 12, the third heat exchange plate 13, and the fourth heat exchange plate 14 then transfer the heat to the heat exchange tube 2, thereby realizing the heating of the water in the heat exchange tube 2. As one embodiment, the first heat exchange plate 11, the second heat exchange plate 12, the third heat exchange plate 13 and the fourth heat exchange plate 14 are all made of pure copper with a thickness of 2mm. Pure copper has good thermal conductivity and can effectively improve heating efficiency.

[0047] like Figure 3 As shown, the upper and lower sides of the first heat exchange plate 11, the second heat exchange plate 12, the third heat exchange plate 13 and the fourth heat exchange plate 14 are all provided with flanges 16, and the flanges 16 face away from the first heat exchange plate 11, the second heat exchange plate 12, the third heat exchange plate 13 and the fourth heat exchange plate 14.

[0048] In this embodiment, the upper and lower sides of the first heat exchange plate 11, the second heat exchange plate 12, the third heat exchange plate 13 and the fourth heat exchange plate 14 are all provided with flanges 16. On the one hand, the flanges 16 can enhance the overall strength of the heat exchanger 1. On the other hand, by providing flanges 16, when heated by gas, the hot air flow can be effectively guided, thereby heating the water in the heat exchange tube 2.

[0049] like Figure 4 As shown, the heat exchange tube 2 includes multiple straight pipe sections 23 and multiple connecting pipe sections 24. The multiple straight pipe sections 23 extend along the length direction of the heat exchanger 1 and are arranged sequentially at intervals along the width direction of the heat exchanger 1. Each pair of adjacent straight pipe sections 23 are connected and interconnected through the connecting pipe sections 24.

[0050] In this embodiment, multiple straight pipe sections 23 extend along the length of the heat exchanger 1 and are arranged at intervals along the width of the heat exchanger 1. Each pair of adjacent straight pipe sections 23 is connected and interconnected by a connecting pipe section 24, allowing water to flow within both the straight pipe sections 23 and the connecting pipe section 24. This arrangement maximizes the surface area of ​​the straight pipe sections 23 within the heat exchanger 1. Thus, during heat exchange, the heat exchanger 1 can efficiently and comprehensively transfer heat to the straight pipe sections 23, heating the water within them and significantly improving heating efficiency. As one embodiment, both the straight pipe sections 23 and the connecting pipe section 24 are made of pure copper, with an outer diameter of 10.8 mm and a wall thickness of 0.6 mm.

[0051] like Figure 1 and 2 As shown, multiple straight pipe sections 23 are located inside the heat exchange chamber 15, and multiple connecting pipe sections 24 are located outside the heat exchanger 1. The two ends of the multiple straight pipe sections 23 pass through the first heat exchange plate 11 and the third heat exchange plate 13. Among them, one end of the outermost straight pipe section 23 is the first interface 21 or the second interface 22. The first water pipe 3 is connected to the first interface 21, and the second water pipe 4 is connected to the second interface 22. Adjacent straight pipe sections 23 are connected and interconnected through the connecting pipe sections 24.

[0052] In this embodiment, multiple straight pipe sections 23 are located inside the heat exchange chamber 15, and multiple connecting pipe sections 24 are located outside the heat exchanger 1. The two ends of the multiple straight pipe sections 23 are inserted through the first heat exchange plate 11 and the third heat exchange plate 13. This facilitates the installation of the heat exchange tube 2 on the heat exchanger 1. Among the two outermost straight pipe sections 23, one end of one straight pipe section 23 is the first interface 21, which is connected to the first water pipe 3, and the other end of the straight pipe section 23 is the second interface 22, which is connected to the second water pipe 4. The two adjacent straight pipe sections 23 are connected and interconnected through the connecting pipe section 24. Thus, when the first interface 21 is the water inlet and the second interface 22 is the water outlet, water enters the straight pipe section 23 from the first water pipe 3 and flows into the straight pipe section 23 and the connecting pipe section 24. The heat exchanger 1 heats the water in the straight pipe section 23, and the heated water is output from the second water pipe 4.

[0053] like Figure 3 As shown, both the first heat exchange plate 11 and the third heat exchange plate 13 are provided with pipe holes 17 corresponding to the straight pipe section 23. The pipe holes 17 are provided with extensions 171 protruding in the direction away from the first heat exchange plate 11 or the third heat exchange plate 13. The two ends of the straight pipe section 23 are respectively inserted into the pipe holes 17 on the first heat exchange plate 11 and the third heat exchange plate 13. The connecting pipe section 24 or the first water pipe 3 or the second water pipe 4 abuts against the interior of the extension 171.

[0054] In this embodiment, the two ends of the straight pipe section 23 are respectively inserted into the pipe holes 17 on the first heat exchange plate 11 and the third heat exchange plate 13. The pipe holes 17 have extensions 171 protruding in the direction away from the first heat exchange plate 11 or the third heat exchange plate 13. The size of the pipe holes 17 is adapted to the outer diameter of the straight pipe section 23, and the length of the extensions 171 is 1.2-1.5 times the outer diameter of the straight pipe section 23, ensuring that the straight pipe section 23 is tightly connected to the pipe holes 17. The two outermost straight pipe sections 23 The first water pipe 3 and the second water pipe 4 are connected to each other, and the first water pipe 3 and the second water pipe 4 abut against the inner wall of the extension 171 of the corresponding pipe hole 17. The adjacent straight pipe sections 23 are connected by connecting pipe sections 24, and the connecting pipe sections 24 abut against the inner wall of the extension 171 of the corresponding pipe hole 17. This can increase the contact area between the connecting pipe sections 24, the first water pipe 3 and the second water pipe 4 and the heat exchanger 1, thereby improving the heat transfer efficiency between the heat exchanger 1 and the heat exchange tube 2.

[0055] like Figure 4 As shown, the heat exchange tube 2 also includes a return pipe section 25, which is disposed on two adjacent connecting pipe sections 24, and the return pipe section 25 is connected to both adjacent connecting pipe sections 24.

[0056] In this embodiment, the return pipe section 25 is disposed on two adjacent connecting pipe sections 24, and the return pipe section 25 is connected to both adjacent connecting pipe sections 24. This allows water from one connecting pipe section 24 to flow directly back to the other connecting pipe section 24 via the return pipe section 25. When heating water in the heating pipe, if the water in one straight pipe section 23 heats up too quickly and reaches an excessively high temperature, the cooler water from the other straight pipe section 23 can be flowed through the return pipe to the excessively hot straight pipe section 23, cooling the water and preventing the water in the heat exchange tube 2 from boiling too quickly. As one embodiment, the return pipe section 25 is made of pure copper.

[0057] like Figure 4 and 5 As shown, a baffle plate 231 is provided inside the straight pipe section 23. The baffle plate 231 is arranged along the length of the straight pipe section 23 and is arranged in a spiral shape.

[0058] In this embodiment, a baffle plate 231 is installed inside the straight pipe section 23. The baffle plate 231 is arranged along the length of the straight pipe section 23. The baffle plate 231 can effectively guide the water flow direction, reduce water flow turbulence, improve water flow efficiency, and thus uniformly heat the water in the heat exchange tube 2. The baffle plate 231 is arranged in a spiral shape and is made of high temperature resistant stainless steel with a pitch of 20mm.

[0059] like Figure 2As shown, the heat exchanger also includes an antifreeze sensor 6, which is installed on the heat exchange tube 2. The antifreeze sensor 6 is used to detect the temperature of the water in the heat exchange tube 2. When the temperature detected by the antifreeze sensor 6 is lower than the preset temperature, the thick film heating element 5 is activated to heat the water. When the temperature detected by the antifreeze sensor 6 is higher than the preset temperature, the thick film heating element 5 is turned off.

[0060] In this embodiment, the antifreeze sensor 6 is installed on the heat exchange tube 2 to monitor the temperature of the water inside the heat exchange tube 2 in real time. When the detected temperature is lower than a preset temperature (the temperature at which the water inside the heat exchange tube 2 freezes), such as below -5°C, the thick-film heating element is activated by the control system (e.g., a PLC control system) to heat the heat exchanger 1, thereby heating the water inside the heat exchange tube 2 and preventing it from freezing and bursting. When the detected temperature is higher than the preset temperature, such as above 75°C, the thick-film heating element is deactivated by the control system to prevent the water inside the heat exchange tube 2 from overheating due to continuous heating. As one embodiment, the antifreeze sensor 6 uses a platinum resistance thermometer with an accuracy class of A and a resistance of 100Ω.

[0061] Example 2:

[0062] like Figure 6 As shown, this embodiment provides a water heater, including a housing 7 and a heat exchanger as described in Embodiment 1; the heat exchanger is installed inside the housing 7.

[0063] In this embodiment, a thick-film electric heating element 5 is provided on the heat exchanger 1 of the heat exchanger. When the outdoor temperature drops to a certain level, the thick-film electric heating element 5 is activated. The thick-film electric heating element 5 heats the heat exchanger 1, thereby heating the water in the heat exchange tube 2. This effectively prevents the water in the heat exchange tube 2 from continuously cooling down and freezing, and prevents the heat exchange tube 2 in the heat exchanger from bursting, thus ensuring the service life and reliability of the water heater.

[0064] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A heat exchanger, characterized in that, include: Heat exchanger (1); Heat exchange tube (2), the heat exchanger (1) is provided with the heat exchange tube (2), the heat exchange tube (2) has a first interface (21) and a second interface (22), the first interface (21) and the second interface (22) extend to the outside of the heat exchanger (1); The first water pipe (3) is connected to the first interface (21) and the first water pipe (3) is connected to the heat exchange pipe (2); The second water pipe (4) is connected to the second interface (22) and is connected to the heat exchange pipe (2); The heat exchanger (1) is provided with a thick film electric heating element (5).

2. The heat exchanger according to claim 1, characterized in that, The thick film heating element (5) is disposed on the outer side of the heat exchanger (1), and the thick film heating element (5) covers the outer side of the heat exchanger (1).

3. The heat exchanger according to claim 1 or 2, characterized in that, The heat exchanger (1) includes a first heat exchange plate (11), a second heat exchange plate (12), a third heat exchange plate (13), and a fourth heat exchange plate (14) connected end to end. The first heat exchange plate (11), the second heat exchange plate (12), the third heat exchange plate (13), and the fourth heat exchange plate (14) enclose a heat exchange cavity (15) for accommodating the heat exchange tube (2).

4. The heat exchanger according to claim 3, characterized in that, The upper and lower sides of the first heat exchange plate (11), the second heat exchange plate (12), the third heat exchange plate (13) and the fourth heat exchange plate (14) are all provided with flanges (16), and the flanges (16) face away from the first heat exchange plate (11), the second heat exchange plate (12), the third heat exchange plate (13) and the fourth heat exchange plate (14).

5. The heat exchanger according to claim 3, characterized in that, The heat exchange tube (2) includes multiple straight pipe sections (23) and multiple connecting pipe sections (24). The multiple straight pipe sections (23) extend along the length direction of the heat exchanger (1) and are arranged sequentially at intervals along the width direction of the heat exchanger (1). Each pair of adjacent straight pipe sections (23) are connected and interconnected through the connecting pipe sections (24).

6. The heat exchanger according to claim 5, characterized in that, Multiple straight pipe sections (23) are located inside the heat exchange chamber (15), and multiple connecting pipe sections (24) are located outside the heat exchanger (1). The two ends of the multiple straight pipe sections (23) are inserted through the first heat exchange plate (11) and the third heat exchange plate (13). Among them, one end of the outermost straight pipe section (23) is the first interface (21) or the second interface (22). The first water pipe (3) is connected to the first interface (21), and the second water pipe (4) is connected to the second interface (22). Adjacent straight pipe sections (23) are connected and interconnected through the connecting pipe section (24).

7. The heat exchanger according to claim 5, characterized in that, Both the first heat exchange plate (11) and the third heat exchange plate (13) are provided with pipe holes (17) corresponding to the straight pipe section (23). The pipe holes (17) are provided with extensions (171) protruding away from the first heat exchange plate (11) or the third heat exchange plate (13). The two ends of the straight pipe section (23) are respectively inserted into the pipe holes (17) on the first heat exchange plate (11) and the third heat exchange plate (13). The connecting pipe section (24) or the first water pipe (3) or the second water pipe (4) abuts against the interior of the extension (171).

8. The heat exchanger according to claim 5, characterized in that, The heat exchange tube (2) also includes a return pipe section (25), which is disposed on two adjacent connecting pipe sections (24) and is connected to both adjacent connecting pipe sections (24).

9. The heat exchanger according to claim 5, characterized in that, A baffle plate (231) is provided inside the straight pipe section (23). The baffle plate (231) is arranged along the length of the straight pipe section (23) and is arranged in a spiral shape.

10. The heat exchanger according to claim 1, characterized in that, The heat exchanger also includes an antifreeze sensor (6), which is installed on the heat exchange tube (2). The antifreeze sensor (6) is used to detect the temperature of the water in the heat exchange tube (2). When the temperature detected by the antifreeze sensor (6) is lower than the preset temperature, the thick film heating element (5) is activated for heating. When the temperature detected by the antifreeze sensor (6) is higher than the preset temperature, the thick film heating element (5) is turned off.

11. A water heater, characterized in that, include: Outer shell (7); The heat exchanger according to any one of claims 1-10, wherein the heat exchanger is installed inside the housing (7).

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