Multi-stage heat exchange structure for heater

Abstract

The invention relates to the related technical field of heater accessories, in particular to a multi-stage heat exchange structure for a heater, which comprises a first-stage heat exchange tank, a second-stage heat exchange tank, a third-stage heat exchange tank, a first-stage heat exchange piece, a second-stage heat exchange piece and a third-stage heat exchange piece, a fourth-stage flange pipe is fixedly welded to the position, close to the lower side, of the right side end of the second-stage heat exchange tank, a fifth-stage flange pipe is fixedly welded to the position, close to the upper side, of the right side end of the third-stage heat exchange tank, and a sixth-stage flange pipe is fixedly welded to the position, close to the lower side, of the left side end of the third-stage heat exchange tank. The second-stage heat exchange part is arranged in an inner cavity of the second-stage heat exchange tank, a first-stage flange pipe is fixedly welded to the position, close to the upper side, of the right side end of the first-stage heat exchange tank, and a second-stage flange pipe is fixedly welded to the position, close to the lower side, of the left side end of the first-stage heat exchange tank; and through multi-stage heat exchange of the first-stage heat exchange piece, the second-stage heat exchange piece and the third-stage heat exchange piece, the heating effect on the cold fluid is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heater accessories, in particular to a multi-stage heat exchange structure for a heater. BACKGROUND

[0002] A heater refers to a device that uses various energies to achieve heating effects, among which the heat exchange structure is a component of one type of heater, mainly divided into three categories: plate heat exchanger, tube heat exchanger and heat pipe heat exchanger, each structure has its specific composition and application scenario; The existing patent file with the publication number CN110006171A discloses a gas heater, which includes a PTC heating core with a heating power of 3000W and a heat conduction structure for assembling the PTC heating core, the PTC heating core can be connected to a power supply through a wire, the PTC heating core and the heat conduction structure are axially arranged in a three-dimensional fin heat exchange pipe, the inner wall of the three-dimensional fin heat exchange pipe and the outer wall of the heat conduction structure are in interference fit, the three-dimensional fin heat exchange pipe is axially arranged in an outer cylinder, a refrigerant medium enters the outer cylinder through an air inlet, a flange is arranged at one end of the air inlet for connecting a fan flange or other air introduction equipment, and heat exchange is realized with the three-dimensional fin heat exchange pipe and the heat conduction structure, and the heat medium obtained by heat exchange flows out through an air outlet. However, the heat exchange structure in the above-mentioned scheme is fixedly arranged, and the whole structure cannot form a stirring effect on the fluid, thereby limiting the overall heat exchange effect, therefore, the present application provides a multi-stage heat exchange structure for a heater to solve the above-mentioned problems. SUMMARY

[0003] The present application aims to provide a multi-stage heat exchange structure for a heater to solve the problems raised in the background art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a multi-stage heat exchange structure for a heater, comprising: A first heat exchange tank is fixedly welded with a first flange pipe at the right side end of the upper side, and a second flange pipe is fixedly welded with the left side end of the lower side of the first heat exchange tank; A second heat exchange tank is fixedly welded with a third flange pipe at the left side end of the upper side, and a fourth flange pipe is fixedly welded with the right side end of the lower side of the second heat exchange tank; A third heat exchange tank is fixedly welded with a fifth flange pipe at the right side end of the upper side, and a sixth flange pipe is fixedly welded with the left side end of the lower side of the third heat exchange tank; A first heat exchange element is arranged in the inner cavity of the first heat exchange tank; A second heat exchange element is arranged in the inner cavity of the second heat exchange tank; A third heat exchange element is arranged in the inner cavity of the third heat exchange tank; The primary, secondary, and tertiary heat exchange tanks are all horizontal cylindrical structures, and are fixed to the heat exchange tank support by connecting frames. The primary, secondary, and tertiary heat exchange tanks are arranged sequentially from bottom to top. The primary and secondary heat exchange components are connected by secondary fluid pipes, and the secondary and tertiary heat exchange components are connected by tertiary fluid pipes.

[0005] Preferably, the primary flange is connected to the heat fluid supply equipment via a primary pipeline, the secondary flange is connected to the tertiary flange, the quaternary flange is connected to the quinary flange, and the sixth flange is connected to the heat fluid recovery equipment via a secondary pipeline. The left end of the primary heat exchanger is connected to the cold fluid supply equipment via a primary fluid pipe, and the right end of the tertiary heat exchanger is connected to the cold fluid recovery equipment via a quaternary fluid pipe. Flanges are fixedly welded to the side walls of the primary, secondary, tertiary, and quaternary fluid pipes. Flanges are integrally formed at both ends of the primary, secondary, and tertiary heat exchange tanks, and the flanges are respectively positioned and connected to the corresponding flanges using bolts and nuts.

[0006] Preferably, the primary heat exchanger includes a primary connector, a secondary connector, a guide tube, and a heat exchange tube. The primary connector and the secondary connector are integrally formed with the ends of the primary fluid tube and the secondary fluid tube, respectively. Each primary connector and the secondary connector has a liquid collection cavity, which is connected to the corresponding fluid tube. A fluid hole is formed through the inner end of the liquid collection cavity. The end of each fluid hole has a guide tube docking hole. The guide tube docks with the guide tube docking holes on the primary connector and the secondary connector, respectively. The heat exchange tube is spring-shaped and is movably sleeved on the guide tube. Six guide tubes and six heat exchange tubes are evenly arranged around the circumference.

[0007] Preferably, a primary sealing element and a secondary sealing element are integrally formed in the cavity of the guide tube, which divide the cavity of the guide tube into a primary cavity, a secondary cavity, and a tertiary cavity. A primary pipe connection port and a secondary pipe connection port are formed on the side wall of the guide tube, which are respectively connected to the primary cavity and the tertiary cavity. The left end of the heat exchange tube is connected to the primary pipe connection port through a primary connecting pipe, and the right end of the heat exchange tube is connected to the secondary pipe connection port through a secondary connecting pipe.

[0008] Preferably, the structures of the secondary and tertiary heat exchangers are the same as those of the primary heat exchanger, and the installation methods of the secondary and tertiary heat exchangers are the same as those of the primary heat exchanger.

[0009] Preferably, a guide plate is integrally formed on the side wall of the guide tube, and six guide plates are arranged around the side wall of the guide tube in a circular pattern, and the heat exchange tube is movably sleeved on the guide plate.

[0010] Preferably, a stress plate is integrally formed on the side wall of the heat exchange tube in the outer direction. The stress plate is arranged in a spiral shape, and there is a gap between the stress plates on adjacent heat exchange tubes. The stress plate does not contact the inner wall of the heat exchange tank.

[0011] Preferably, the load-bearing plate is made of spring steel, the heat exchange tube is a copper tube, and the wall thickness of the heat exchange tube is less than one millimeter.

[0012] Preferably, during actual installation, both ends of the guide tube are fitted with primary rubber sealing rings, and the outer surface of the flange is provided with sealing grooves, in which secondary rubber sealing rings are fitted. During actual installation, both the primary and secondary rubber sealing rings are in a compressed state, and both the primary and secondary rubber sealing rings are silicone rubber sealing rings.

[0013] Preferably, both ends of the guide tube are equipped with limiting plates, and the limiting plates are provided with alignment holes. When the guide tube is actually installed, the end of the guide tube is inserted into the alignment hole, and the outer diameter of the limiting plate matches the inner diameter of the heat exchange tank. The limiting plate is located on the outer side of the corresponding flange tube.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a multi-stage heat exchange structure for the heater, which consists of a primary heat exchange tank, a secondary heat exchange tank, a tertiary heat exchange tank, a primary heat exchange component, a secondary heat exchange component, and a tertiary heat exchange component, the heating effect on the cold fluid is effectively improved through multi-stage heat exchange via the primary heat exchange component, the secondary heat exchange component, and the tertiary heat exchange component. 2. By setting the primary, secondary, and tertiary heat exchange components to consist of a primary connector, a secondary connector, a guide tube, and a heat exchange tube, and by setting the heat exchange tube in a spring shape and allowing the heat exchange tube to be movably sleeved on the guide tube, the heat exchange area of ​​the heat exchange tube is effectively increased, thereby effectively improving the overall effective heat exchange efficiency of the heat exchange tube. 3. By installing a stress plate on the outer sidewall of the heat exchange tube in a spiral arrangement and using spring steel as the stress plate, and using copper tubes with a wall thickness of less than one millimeter, the hot fluid passing through the primary, secondary, and tertiary heat exchange tanks can exert an impact force on the stress plate, causing the entire heat exchange tube to vibrate. This vibrates the cold fluid inside the heat exchange tube and also moves the hot fluid, thereby further improving the heat exchange efficiency between the cold and hot fluids. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a half-sectional view of the present invention; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point B; Figure 5 This is a schematic diagram showing the position distribution of the guide tube of the present invention; Figure 6 This is a schematic diagram of the guide tube structure of the present invention; Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point C; Figure 8 for Figure 6 Enlarged schematic diagram of the structure at point D; Figure 9 This is a schematic diagram of the limiting plate structure of the present invention.

[0016] In the diagram: 1. Primary heat exchanger tank; 2. Secondary heat exchanger tank; 3. Tertiary heat exchanger tank; 4. Primary heat exchanger component; 5. Secondary heat exchanger component; 6. Tertiary heat exchanger component; 7. Primary fluid pipe; 8. Secondary fluid pipe; 9. Tertiary fluid pipe; 10. Quaternary fluid pipe; 11. Primary flange pipe; 12. Secondary flange pipe; 13. Quaternary flange pipe; 14. Quaternary flange pipe; 15. VI flange pipe; 16. Primary connector; 17. Secondary connector; 18. Guide pipe; 19. Heat exchanger tube; 20. Liquid collecting chamber 21, fluid hole 22, guide tube docking hole 23, primary sealing component 24, secondary sealing component 25, primary pipe cavity 26, secondary pipe cavity 27, tertiary pipe cavity 28, primary pipe connection port 30, secondary pipe connection port 31, primary connecting pipe 32, secondary connecting pipe 33, guide plate 34, stress plate 35, primary rubber sealing ring 36, secondary rubber sealing ring 37, limiting plate 38, alignment hole 39, flange 40, flange 41. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-9 The present invention provides the following three preferred embodiments: Example 1: A multi-stage heat exchange structure for a heater includes a primary heat exchange tank 1, a secondary heat exchange tank 2, a tertiary heat exchange tank 3, a primary heat exchange component 4, a secondary heat exchange component 5, and a tertiary heat exchange component 6. A tertiary flange pipe 13 is fixedly welded to the upper left side of the secondary heat exchange tank 2, a quaternary flange pipe 14 is fixedly welded to the lower right side of the secondary heat exchange tank 2, a quinary flange pipe 15 is fixedly welded to the upper right side of the tertiary heat exchange tank 3, and a septum flange pipe 16 is fixedly welded to the lower left side of the tertiary heat exchange tank 3. The primary heat exchange component 4 is disposed within the inner cavity of the primary heat exchange tank 1, the secondary heat exchange component 5 is disposed within the inner cavity of the secondary heat exchange tank 2, a primary flange pipe 11 is fixedly welded to the upper right side of the primary heat exchange tank 1, a secondary flange pipe 12 is fixedly welded to the lower left side of the primary heat exchange tank 1, and the tertiary heat exchange component 6 is disposed within the tertiary heat exchange tank 2. Inside the heat exchange tank 3, the primary heat exchange tank 1, the secondary heat exchange tank 2, and the tertiary heat exchange tank 3 are all horizontal cylindrical structures. These tanks are fixed to the heat exchange tank support via connecting frames and are arranged sequentially from bottom to top. The primary heat exchange element 4 and the secondary heat exchange element 5 are connected via a secondary fluid pipe 8, and the secondary heat exchange element 5 and the tertiary heat exchange element 6 are connected via a tertiary fluid pipe 9. By setting up a multi-stage heat exchange structure for the heater, composed of the primary heat exchange tank 1, the secondary heat exchange tank 2, the tertiary heat exchange tank 3, the primary heat exchange element 4, the secondary heat exchange element 5, and the tertiary heat exchange element 6, the heating effect on the cold fluid is effectively improved through multi-stage heat exchange via the primary heat exchange element 4, the secondary heat exchange element 5, and the tertiary heat exchange element 6.

[0019] The primary flange 11 is connected to the hot fluid supply equipment via a primary pipeline; the secondary flange 12 is connected to the tertiary flange 13; the quaternary flange 14 is connected to the quinary flange 15; and the sixth flange 16 is connected to the hot fluid recovery equipment via a secondary pipeline. The left end of the primary heat exchanger 4 is connected to the cold fluid supply equipment via a primary fluid pipe 7; and the right end of the tertiary heat exchanger 6 is connected to the cold fluid recovery equipment via a quaternary fluid pipe 10. Flanges 40 are fixedly welded to the side walls of the primary fluid pipe 7, secondary fluid pipe 8, tertiary fluid pipe 9, and quaternary fluid pipe 10. Flanges 41 are integrally formed at both ends of the primary heat exchange tank 1, secondary heat exchange tank 2, and tertiary heat exchange tank 3, and the flanges 40 are respectively positioned and connected to the corresponding flanges 41 by bolts and nuts.

[0020] Example 2: Please refer to Figures 2-6 Based on Embodiment 2, the primary heat exchanger 4 includes a primary connector 17, a secondary connector 18, a guide tube 19, and a heat exchange tube 20. The primary connector 17 and the secondary connector 18 are integrally formed with the ends of the primary fluid tube 7 and the secondary fluid tube 8, respectively. Each of the primary connector 17 and the secondary connector 18 has a liquid collection chamber 21, which is connected to the corresponding fluid tube. The inner end of the liquid collection chamber 21 has a fluid hole 22, and the end of the fluid hole 22 has a guide tube docking hole 23. The guide tube 19 docks with the guide tube docking hole 23 on the primary connector 17 and the secondary connector 18, respectively. The heat exchange tube 20 is spring-shaped and is movably sleeved on the guide tube 19. There are six guide tubes 19 and six heat exchange tubes 20 arranged in equal circumferences.

[0021] The guide tube 19 has an integrally formed primary sealing element 24 and secondary sealing element 25 in its cavity. The primary sealing element 24 and secondary sealing element 25 divide the cavity of the guide tube 19 into a primary cavity 26, a secondary cavity 27 and a tertiary cavity 28. The guide tube 19 has a primary pipe connection port 30 and a secondary pipe connection port 31 formed on its side wall. The primary pipe connection port 30 and the secondary pipe connection port 31 are respectively connected to the primary cavity 26 and the tertiary cavity 28. The left end of the heat exchange tube 20 is connected to the primary pipe connection port 30 through the primary connection pipe 32, and the right end of the heat exchange tube 20 is connected to the secondary pipe connection port 31 through the secondary connection pipe 33.

[0022] The structures of the secondary heat exchanger 5 and the tertiary heat exchanger 6 are the same as those of the primary heat exchanger 4, and the installation methods of the secondary heat exchanger 5 and the tertiary heat exchanger 6 are the same as those of the primary heat exchanger 4. By setting the primary heat exchanger 4, the secondary heat exchanger 5, and the tertiary heat exchanger 6 to consist of a primary connector 17, a secondary connector 18, a guide tube 19, and a heat exchange tube 20, and setting the heat exchange tube 20 in a spring shape and allowing the heat exchange tube 20 to be movably sleeved on the guide tube 19, the heat exchange area of ​​the heat exchange tube 20 is effectively increased, thereby effectively improving the overall effective heat exchange efficiency of the heat exchange tube 20.

[0023] Example 3: Please refer to Figures 4-9 Based on Embodiment 2, a guide plate 34 is integrally formed on the side wall of the guide tube 19. Six guide plates 34 are arranged around the side wall of the guide tube 19 in a circular pattern. The heat exchange tube 20 is movably sleeved on the guide plate 34. The guide plate 34 can prevent the inner wall of the heat exchange tube 20 from contacting the side wall of the guide tube 19 and allow a certain gap to be formed between the heat exchange tube 20 and the guide tube 19, thereby further ensuring the heat exchange area of ​​the heat exchange tube 20.

[0024] A stress-bearing plate 35 is integrally formed on the outer sidewall of the heat exchange tube 20. The stress-bearing plate 35 is arranged in a spiral shape, and there is a gap between the stress-bearing plates 35 on adjacent heat exchange tubes 20. The stress-bearing plate 35 is not in contact with the inner wall of the heat exchange tank. The stress-bearing plate 35 is made of spring steel. The heat exchange tube 20 is a copper tube with a wall thickness of less than one millimeter. By setting the stress-bearing plate 35 on the outer sidewall of the heat exchange tube 20 and arranging the stress-bearing plate 35 in a spiral shape, the stress-bearing plate 35 is integrated on the outer sidewall of the heat exchange tube 20. The force plate 35 is made of spring steel, and the heat exchange tube 20 is made of copper tube with a wall thickness of less than one millimeter. When the hot fluid passes through the first-stage heat exchange tank 1, the second-stage heat exchange tank 2, and the third-stage heat exchange tank 3, it can generate an impact force on the force plate 35, thereby causing the heat exchange tube 20 to vibrate as a whole. This vibrates the cold fluid inside the heat exchange tube 20, and the heat exchange tube 20 can also vibrate the hot fluid, thereby further improving the heat exchange efficiency between the cold and hot fluids.

[0025] During actual installation, both ends of the guide tube 19 are fitted with primary rubber sealing rings 36, and the outer side of the flange 41 is provided with sealing grooves, in which secondary rubber sealing rings 37 are fitted. During actual installation, both the primary rubber sealing rings 36 and the secondary rubber sealing rings 37 are in a compressed state. Both the primary rubber sealing rings 36 and the secondary rubber sealing rings 37 are silicone rubber sealing rings, which can improve the sealing performance between structures.

[0026] Both ends of the guide tube 19 are equipped with limiting plates 38, and the limiting plates 38 are provided with alignment holes 39. During actual installation, the end of the guide tube 19 is inserted into the alignment hole 39, and the outer diameter of the limiting plate 38 matches the inner diameter of the heat exchange tank. The limiting plate 38 is located on the outer side of the corresponding flange tube. The limiting plate 38 can provide positioning support for the end of the guide tube 19, thereby facilitating the installation personnel to connect the guide tube 19 with the primary connector 17 and the secondary connector 18.

[0027] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A multi-stage heat exchange structure for a heater, characterized in that: include: A primary heat exchange tank (1) is provided with a primary flange pipe (11) fixedly welded to the upper side of the right end of the primary heat exchange tank (1) and a secondary flange pipe (12) fixedly welded to the lower side of the left end of the primary heat exchange tank (1). A secondary heat exchange tank (2) is provided with a tertiary flange pipe (13) fixedly welded to the upper side of the left side end of the secondary heat exchange tank (2) and a quaternary flange pipe (14) fixedly welded to the lower side of the right side end of the secondary heat exchange tank (2). The three-stage heat exchange tank (3) has a five-stage flange pipe (15) fixedly welded to the upper side of the right end of the three-stage heat exchange tank (3) and a six-stage flange pipe (16) fixedly welded to the lower side of the left end of the three-stage heat exchange tank (3). A primary heat exchanger (4) is disposed in the inner cavity of a primary heat exchange tank (1); Secondary heat exchanger (5), wherein the secondary heat exchanger (5) is disposed in the inner cavity of the secondary heat exchange tank (2); The three-stage heat exchanger (6) is disposed in the inner cavity of the three-stage heat exchange tank (3); The primary heat exchange tank (1), secondary heat exchange tank (2), and tertiary heat exchange tank (3) are all horizontal cylindrical structures. The primary heat exchange tank (1), secondary heat exchange tank (2), and tertiary heat exchange tank (3) are all fixed on the heat exchange tank support by connecting frames. The primary heat exchange tank (1), secondary heat exchange tank (2), and tertiary heat exchange tank (3) are arranged sequentially from bottom to top. The primary heat exchange component (4) and secondary heat exchange component (5) are connected by a secondary fluid pipe (8), and the secondary heat exchange component (5) and tertiary heat exchange component (6) are connected by a tertiary fluid pipe (9).

2. The multi-stage heat exchange structure for a heater according to claim 1, characterized in that: The first-stage flange pipe (11) is connected to the hot fluid supply equipment through the first-stage pipeline. The second-stage flange pipe (12) is connected to the third-stage flange pipe (13). The fourth-stage flange pipe (14) is connected to the fifth-stage flange pipe (15). The sixth-stage flange pipe (16) is connected to the hot fluid recovery equipment through the second-stage pipeline. The left end of the first-stage heat exchanger (4) is connected to the cold fluid supply equipment through the first-stage fluid pipe (7). The right end of the third-stage heat exchanger (6) is connected to the cold fluid recovery equipment through the fourth-stage fluid pipe (10). Flanges (40) are fixedly welded to the side walls of the first-stage fluid pipe (7), the second-stage fluid pipe (8), the third-stage fluid pipe (9), and the fourth-stage fluid pipe (10). Flanges (41) are integrally formed at both ends of the first-stage heat exchange tank (1), the second-stage heat exchange tank (2), and the third-stage heat exchange tank (3). The flanges (40) are respectively positioned and connected to the corresponding flanges (41) by bolts and nuts.

3. The multi-stage heat exchange structure for a heater according to claim 2, characterized in that: The primary heat exchanger (4) includes a primary connector (17), a secondary connector (18), a guide tube (19), and a heat exchange tube (20). The primary connector (17) and the secondary connector (18) are integrally formed with the ends of the primary fluid tube (7) and the secondary fluid tube (8), respectively. Each of the primary connector (17) and the secondary connector (18) has a liquid collecting cavity (21), which is connected to the corresponding fluid tube. The system is connected, and a fluid hole (22) is opened through the inner end of the liquid collection chamber (21). The end of the fluid hole (22) is provided with a guide tube docking hole (23). The guide tube (19) is docked with the guide tube docking hole (23) on the first-stage connector (17) and the second-stage connector (18). The heat exchange tube (20) is spring-shaped and is movably sleeved on the guide tube (19). There are six guide tubes (19) and six heat exchange tubes (20) with equal circumference.

4. The multi-stage heat exchange structure for a heater according to claim 3, characterized in that: The guide tube (19) has an integrally formed primary sealing element (24) and secondary sealing element (25) in its cavity. The primary sealing element (24) and secondary sealing element (25) divide the cavity of the guide tube (19) into a primary cavity (26), a secondary cavity (27) and a tertiary cavity (28). The guide tube (19) has a primary pipe connection port (30) and a secondary pipe connection port (31) formed on its side wall. The primary pipe connection port (30) and the secondary pipe connection port (31) are respectively connected to the primary cavity (26) and the tertiary cavity (28). The left end of the heat exchange tube (20) is connected to the primary pipe connection port (30) through a primary connecting pipe (32), and the right end of the heat exchange tube (20) is connected to the secondary pipe connection port (31) through a secondary connecting pipe (33).

5. A multi-stage heat exchange structure for a heater according to claim 4, characterized in that: The structures of the secondary heat exchanger (5) and the tertiary heat exchanger (6) are the same as those of the primary heat exchanger (4), and the installation methods of the secondary heat exchanger (5) and the tertiary heat exchanger (6) are the same as those of the primary heat exchanger (4).

6. A multi-stage heat exchange structure for a heater according to claim 5, characterized in that: The guide tube (19) has an integrally formed guide plate (34) on its side wall. Six guide plates (34) are arranged around the side wall of the guide tube (19) in a circle. The heat exchange tube (20) is movably sleeved on the guide plate (34).

7. A multi-stage heat exchange structure for a heater according to claim 6, characterized in that: A stress plate (35) is integrally formed on the outer side wall of the heat exchange tube (20). The stress plate (35) is spirally arranged, and there is a gap between the stress plates (35) on adjacent heat exchange tubes (20). The stress plate (35) does not contact the inner wall of the heat exchange tank.

8. A multi-stage heat exchange structure for a heater according to claim 7, characterized in that: The load-bearing plate (35) is made of spring steel, the heat exchange tube (20) is a copper tube, and the wall thickness of the heat exchange tube (20) is less than one millimeter.

9. A multi-stage heat exchange structure for a heater according to claim 8, characterized in that: During actual installation, both ends of the guide tube (19) are padded with primary rubber sealing rings (36), and the outer side of the flange (41) is provided with sealing grooves, in which secondary rubber sealing rings (37) are padded. During actual installation, the primary rubber sealing rings (36) and the secondary rubber sealing rings (37) are in a compressed state. Both the primary rubber sealing rings (36) and the secondary rubber sealing rings (37) are silicone rubber sealing rings.

10. A multi-stage heat exchange structure for a heater according to claim 9, characterized in that: Both ends of the guide tube (19) are equipped with limiting plates (38). The limiting plates (38) are provided with alignment holes (39). When the guide tube (19) is actually installed, the end of the guide tube (19) is inserted into the alignment hole (39), and the outer diameter of the limiting plate (38) matches the inner diameter of the heat exchange tank. The limiting plate (38) is located on the outer side of the corresponding flange tube.

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