Methanol combustion heating device for automobile water tank

Abstract

The invention discloses a methanol combustion heating device for an automobile water tank, and relates to the technical field of heating devices.The methanol combustion heating device comprises a fixed bottom plate and a case, the case is mounted at the top end of the fixed bottom plate through bolts, a fixed top plate is mounted at the top end of the case through bolts, and a smoke outlet and a combustion mechanism are mounted in the middle of the top end of the fixed top plate through bolts; the combustion mechanism is installed in the middle of an inner cavity of the machine box through bolts and comprises a combustion chamber and a material storage pipe, the combustion chamber is installed in the middle of the inner cavity of the machine box through bolts and is of a semi-spherical structure, and the material storage pipe is installed in the middle of the bottom end of an inner cavity of the combustion chamber through bolts. The heat exchange tube is evenly heated through the combustion mechanism, the combustion mechanism can generate concentrated flames, heat energy is evenly transferred to the heat exchange tube, it is ensured that the surface of the whole heat exchange tube can be fully heated, and the more even heat exchange effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of heating device technology, specifically to a methanol combustion heating device for automobile water tanks. Background Technology

[0002] In cold climates, the coolant in a car may be affected by low temperatures, causing it to fail to reach the appropriate operating temperature quickly upon startup. Coolant that reaches the appropriate operating temperature more quickly upon startup improves engine thermal efficiency and combustion, reduces engine wear and exhaust emissions, which is crucial for the reliability and performance of a car in cold environments.

[0003] Existing heating devices typically do not focus the flame, resulting in a dispersed temperature within the combustion chamber. Without focused flame, heat is scattered over a wider area, leading to weaker heating and requiring more time to reach the desired temperature. The dispersed flame can also cause uneven heating, resulting in some areas of the heated object overheating while others remain underheated. Furthermore, existing heating devices often lack fins in their heat exchange tubes, resulting in a smaller surface area and lower heat transfer efficiency. This further increases the heating time and causes heat to concentrate in certain areas of the heat exchange tube, while other areas fail to receive sufficient heat. This leads to significant temperature differences between different parts of the heated object. Summary of the Invention

[0004] The purpose of this invention is to provide a methanol combustion heating device for automobile water tanks to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a methanol combustion heating device for an automobile water tank, comprising a fixed base plate, and further comprising;

[0006] The chassis is bolted to the top of a fixed base plate, and a fixed top plate is bolted to the top of the chassis. A smoke outlet is bolted to the center of the top of the fixed top plate.

[0007] The combustion mechanism is bolted to the middle of the inner cavity of the machine housing. The combustion mechanism includes a combustion chamber and a material storage pipe. The combustion chamber is bolted to the middle of the inner cavity of the machine housing and has a hemispherical structure. The material storage pipe is bolted to the middle of the bottom end of the inner cavity of the combustion chamber.

[0008] An exhaust mechanism is installed at the bottom center of the inner cavity of the storage tube by bolts. The exhaust mechanism includes a servo motor, which is installed at the bottom center of the inner cavity of the storage tube by bolts.

[0009] A retaining ring, which is bolted to the top of the combustion chamber;

[0010] A uniform heating mechanism, wherein several uniform heating mechanisms are bolted to the inside of a fixing ring, the uniform heating mechanism includes heat exchange tubes and arc-shaped heat exchange plates, several heat exchange tubes are bolted to the inside of the fixing ring, and several arc-shaped heat exchange plates are bolted to the outside of the heat exchange tubes around the perimeter.

[0011] A fixing mechanism, wherein several fixing mechanisms are bolted to the middle of one end of the arc-shaped heat-receiving plate away from the heat exchange tube, the fixing mechanism including a second fixing plate, the second fixing plate being bolted to the middle of one end of the arc-shaped heat-receiving plate away from the heat exchange tube.

[0012] Preferably, the exhaust mechanism further includes a rotating rod, a fan blade, and a vent plate. The rotating rod is bolted to the top of the output shaft of the servo motor. The fan blade is bolted to the top of the rotating rod and is located in the middle of the inner cavity of the storage tube. The vent plate is bolted to the top of the storage tube and has several first vent holes around its top. Several second vent holes are located in the middle of the bottom of the combustion chamber and are located directly below the storage tube. An air intake pipe is bolted to the middle of the bottom of the combustion chamber.

[0013] Preferably, the storage tube has a storage space inside, and a feed inlet is provided on the right side of the bottom end of the storage tube. A feed tube is installed inside the feed inlet by bolts. A first fixing hole is provided on the right side of the bottom end of the combustion chamber. The bottom end of the feed tube passes through the first fixing hole. A solenoid valve is installed on the middle of the outer side of the feed tube by bolts.

[0014] Preferably, the combustion mechanism further includes a combustion plate, flame nozzles, an ignition device, a feed pipe, a heat collection plate, and a feed hole. Several combustion plates are bolted to the periphery of the combustion chamber, and several heat collection plates are bolted to the middle of both sides of the combustion plate. An installation groove is provided in the middle of the inner cavity of the combustion plate. The feed pipe is bolted to the inside of the installation groove. Several flame nozzles are bolted to the top of the feed pipe. The ignition device is bolted to the middle of the top of the combustion plate. Several discharge ports are provided around the outer periphery of the storage pipe. Several feed holes are provided at the end of the combustion plate near the discharge port of the storage pipe, and the feed holes are fitted with the discharge ports. The feed pipe is connected to the feed holes.

[0015] Preferably, a mounting ring is bolted to the middle of the outer side of the combustion chamber, and a fourth fixing plate is bolted to the outer periphery of the mounting ring. The end of the fourth fixing plate away from the combustion chamber is bolted to the middle of the inner cavity of the engine casing.

[0016] Preferably, the uniform heating mechanism further includes outer fins, connecting pipes, and inner fins. Several outer fins are bolted to both sides of the arc-shaped heating plate, several connecting pipes are bolted to the front and rear ends of the heat exchange tubes, the front and rear ends of the inner cavity of the fixing ring are provided with second fixing holes, and several heat exchange tubes pass through the second fixing holes. Several inner fins are bolted to the periphery of the inner cavity of the heat exchange tubes.

[0017] Preferably, a water inlet pipe is bolted to the front end of the heat exchange tube on the left, and a water outlet pipe is bolted to the front end of the heat exchange tube on the right. The water inlet pipe and the water outlet pipe pass through the second fixing hole. The water inlet pipe, the water outlet pipe, the air inlet pipe, and the feed pipe pass through the casing. A mounting plate is bolted to the middle of the front end of the casing. A water pump is bolted to the middle of the top of the mounting plate. The water pump's water delivery end is bolted to the water inlet pipe. A temperature sensor is bolted to the front end of the water outlet pipe.

[0018] Preferably, the fixing mechanism further includes a third fixing plate and a U-shaped fixing plate. The third fixing plate is installed on both sides of the second fixing plate by bolts, and the bottom end of the third fixing plate is connected to the middle of the arc-shaped heat-receiving plate away from the heat exchange tube by bolts. The inner cavity of the U-shaped fixing plate is installed on the second fixing plate away from the heat exchange tube by bolts, and the bottom end of the U-shaped fixing plate is connected to the third fixing plate away from the heat exchange tube by bolts.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This invention uses a combustion mechanism to uniformly heat the heat exchange tube. The combustion mechanism can generate a concentrated flame, which can evenly transfer heat energy to the heat exchange tube. This ensures that the entire surface of the heat exchange tube is fully heated, achieving a more uniform heat exchange effect. Furthermore, through uniform heating, fuel or energy can be utilized more effectively. The exhaust mechanism exhausts the combustion chamber. During the combustion process, exhaust gases are generated, including combustion products, soot, and harmful gases. Expelling these exhaust gases from the combustion chamber through the exhaust mechanism can maintain clean indoor air and reduce environmental pollution.

[0021] 2. The present invention uses a uniform heating mechanism to set fins on the outside and inside of the heat exchange tube. By setting fins on the outside and inside of the heat exchange tube, the effective heat exchange surface area can be increased. The presence of fins can expand the heat exchange surface, provide more opportunities for contact with the medium and heat transfer, thereby increasing the heat exchange efficiency. The outer fins are fixed by a fixing mechanism, which can ensure close contact between the fluid and the fins, effectively increasing the heat exchange surface area. Attached Figure Description

[0022] Figure 1 A schematic diagram of the overall structure is provided for the embodiments of the present invention;

[0023] Figure 2 This is a structural diagram of the overall internal structure provided for an embodiment of the present invention;

[0024] Figure 3 This is a structural diagram of the combustion mechanism and the uniform heating mechanism provided in an embodiment of the present invention;

[0025] Figure 4 This is a structural diagram of the uniform heating mechanism provided in an embodiment of the present invention;

[0026] Figure 5 A cross-sectional structural diagram of the uniform heating mechanism provided in an embodiment of the present invention;

[0027] Figure 6 This is a structural diagram of the air inlet pipe and feed pipe provided in an embodiment of the present invention;

[0028] Figure 7 A structural diagram of the combustion mechanism provided in an embodiment of the present invention;

[0029] Figure 8 An exploded structural diagram of the exhaust mechanism provided in an embodiment of the present invention;

[0030] Figure 9 Provided for embodiments of the present invention Figure 8 Enlarged structural diagram at point A in the middle;

[0031] Figure 10 This is a rear view structural diagram of the combustion plate provided in an embodiment of the present invention;

[0032] Figure 11 This is a rear-view structural diagram of the combustion chamber provided in an embodiment of the present invention;

[0033] Figure 12 Provided for embodiments of the present invention Figure 11 Structural diagram at point B;

[0034] Figure 13 This is a structural diagram of the feed hole provided in an embodiment of the present invention.

[0035] In the diagram: 1. Fixed base plate; 2. Combustion mechanism; 201. Combustion chamber; 202. Combustion plate; 203. Flame nozzle; 204. Ignition device; 205. Feed pipe; 206. Heat collection plate; 207. Storage pipe; 208. Feed hole; 3. Uniform heating mechanism; 301. Heat exchange tube; 302. Outer fin; 303. Connecting pipe; 304. Arc-shaped heat receiving plate; 305. Inner fin; 4. Fixing mechanism; 401. Second fixing plate; 402. Third fixing plate. 403. Fixed plate; 5. U-shaped fixed plate; 5. Exhaust mechanism; 501. Servo motor; 502. Rotating rod; 503. Fan blade; 504. Ventilation plate; 6. Fixed top plate; 7. Smoke outlet; 8. Water inlet pipe; 9. Water outlet pipe; 10. Temperature sensor; 11. Mounting plate; 12. Water pump; 13. Air inlet pipe; 14. Feed pipe; 15. Fixing ring; 16. Solenoid valve; 17. Second vent; 18. Chassis; 19. Mounting ring; 20. Fourth fixed plate. Detailed Implementation

[0036] 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.

[0037] Please see Figure 1-13 The present invention provides a technical solution: a methanol combustion heating device for automobile water tank, including a fixed base plate 1, and further comprising;

[0038] The chassis 18 is bolted to the top of the fixed base plate 1. The top of the chassis 18 is bolted to a fixed top plate 6. The top center of the fixed top plate 6 is bolted to a smoke outlet 7.

[0039] Combustion mechanism 2 is bolted to the middle of the inner cavity of the casing 18. Combustion mechanism 2 includes combustion chamber 201 and material storage pipe 207. Combustion chamber 201 is bolted to the middle of the inner cavity of the casing 18 and has a hemispherical structure. Material storage pipe 207 is bolted to the middle of the bottom end of the inner cavity of combustion chamber 201.

[0040] The exhaust mechanism 5 is installed in the middle of the bottom end of the inner cavity of the storage tube 207 by bolts. The exhaust mechanism 5 includes a servo motor 501, which is installed in the middle of the bottom end of the inner cavity of the storage tube 207 by bolts.

[0041] The fixing ring 15 is installed at the top of the combustion chamber 201 by bolts;

[0042] A uniform heating mechanism 3, several uniform heating mechanisms 3 are installed inside the fixing ring 15 by bolts. The uniform heating mechanism 3 includes heat exchange tubes 301 and arc-shaped heat exchange plates 304. Several heat exchange tubes 301 are installed inside the fixing ring 15 by bolts, and several arc-shaped heat exchange plates 304 are installed around the outside of the heat exchange tubes 301 by bolts.

[0043] Fixing mechanism 4, several fixing mechanisms 4 are installed by bolts at the middle of one end of the arc-shaped heating plate 304 away from the heat exchange tube 301. The fixing mechanism 4 includes a second fixing plate 401, which is installed by bolts at the middle of one end of the arc-shaped heating plate 304 away from the heat exchange tube 301.

[0044] The exhaust mechanism 5 also includes a rotating rod 502, a fan blade 503, and a vent plate 504. The rotating rod 502 is bolted to the top of the output shaft of the servo motor 501. The fan blade 503 is bolted to the top of the rotating rod 502 and is located in the middle of the inner cavity of the storage tube 207. The vent plate 504 is bolted to the top of the storage tube 207 and has several first vent holes around the top of the vent plate 504. Several second vent holes 17 are opened in the middle of the bottom of the combustion chamber 201 and are located directly below the storage tube 207. An air intake pipe 13 is bolted to the middle of the bottom of the combustion chamber 201.

[0045] The storage pipe 207 has a storage space inside, and a feed port is opened on the right side of the bottom end of the storage pipe 207. The feed pipe 14 is installed inside the feed port by bolts. The combustion chamber 201 has a first fixing hole on the right side of the bottom end. The bottom end of the feed pipe 14 passes through the first fixing hole. A solenoid valve 16 is installed on the middle of the outer side of the feed pipe 14 by bolts.

[0046] The combustion mechanism 2 also includes a combustion plate 202, flame nozzles 203, an ignition device 204, a feed pipe 205, a heat collection plate 206, and a feed port 208. Several combustion plates 202 are bolted to the periphery of the combustion chamber 201. Several heat collection plates 206 are bolted to the middle of both sides of the combustion plate 202. An installation groove is formed in the middle of the inner cavity of the combustion plate 202. The feed pipe 205 is bolted to the inside of the installation groove. Several flame nozzles 203 are bolted to the top of the feed pipe 205. The ignition device 204 is bolted to the middle of the top of the combustion plate 202. Several discharge ports are formed around the outer periphery of the storage pipe 207.

[0047] The feed hole 208 is located at the end of the combustion plate 202 near the outlet of the storage pipe 207, and the feed hole 208 is fitted with the outlet. The conveying pipe 205 is connected to the feed hole 208.

[0048] A mounting ring 19 is bolted to the middle of the outer side of the combustion chamber 201. A fourth fixing plate 20 is bolted to the outer periphery of the mounting ring 19. The end of the fourth fixing plate 20 away from the combustion chamber 201 is bolted to the middle of the inner cavity of the casing 18.

[0049] The uniform heating mechanism 3 also includes outer fins 302, connecting pipes 303 and inner fins 305. Several outer fins 302 are bolted to both sides of the arc-shaped heating plate 304. Several connecting pipes 303 are bolted to the front and rear ends of the heat exchange tube 301. The front and rear ends of the inner cavity of the fixing ring 15 are provided with second fixing holes, and several heat exchange tubes 301 pass through the second fixing holes. Several inner fins 305 are bolted to the periphery of the inner cavity of the heat exchange tube 301.

[0050] A water inlet pipe 8 is bolted to the front end of the left heat exchange tube 301, and a water outlet pipe 9 is bolted to the front end of the right heat exchange tube 301. The water inlet pipe 8 and the water outlet pipe 9 pass through the second fixing hole. The water inlet pipe 8, the water outlet pipe 9, the air inlet pipe 13 and the feed pipe 14 pass through the casing 18. A mounting plate 11 is bolted to the middle of the front end of the casing 18. A water pump 12 is bolted to the middle of the top of the mounting plate 11. The water delivery end of the water pump 12 is bolted to the water inlet pipe 8. A temperature sensor 10 is bolted to the front end of the water outlet pipe 9.

[0051] The fixing mechanism 4 also includes a third fixing plate 402 and a U-shaped fixing plate 403. The third fixing plate 402 is bolted to both sides of the second fixing plate 401, and the bottom end of the third fixing plate 402 is bolted to the middle of the arc-shaped heating plate 304 away from the heat exchange tube 301. The inner cavity of the U-shaped fixing plate 403 is bolted to the end of the second fixing plate 401 away from the heat exchange tube 301, and the bottom end of the U-shaped fixing plate 403 is bolted to the end of the third fixing plate 402 away from the heat exchange tube 301.

[0052] Working principle: When using this invention, the feed pipe 14 is connected to an external methanol fuel pool, and methanol fuel is transported by an oil pump. The methanol fuel transport is controlled by a solenoid valve 16. The feed pipe 14 is connected to the feed hole 208 to transport methanol fuel into the feed pipe 205, and then into the flame nozzle 203. The ignition device 204 is started manually by an external controller to ignite the methanol fuel in the flame nozzle 203. The heat collection plate 206 concentrates the temperature in the combustion chamber 201.

[0053] The servo motor 501 is manually started via an external controller. The output shaft of the servo motor 501 drives the rotating rod 502 and the fan blade 503 to rotate, and exhausts the combustion chamber 201 through the intake pipe 13. The water pump 12 is also manually started via the external controller. The water pump 12 delivers the liquid in the car's water tank to the water inlet pipe 8, and then to the heat exchange tube 301. The liquid in the heat exchange tube 301 is heated by the combustion of methanol fuel in the combustion chamber 201. The temperature of the liquid in the heat exchange tube 301 is monitored by the temperature sensor 10. When the temperature reaches 65 degrees, the oil pump is automatically stopped, thus stopping the heating. When the temperature is below 40 degrees, the oil pump is started, thus continuing the heating. The liquid in the car's water tank is circulated by the water pump 12.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A methanol combustion heating device for an automotive water tank, comprising a fixed base plate (1), characterized in that, Also includes: The chassis (18) is movably mounted on the top of the fixed base plate (1), and a fixed top plate (6) is movably mounted on the top of the chassis (18). A smoke outlet (7) is movably mounted in the middle of the top of the fixed top plate (6). Combustion mechanism (2) is movably installed in the middle of the inner cavity of the casing (18). The combustion mechanism (2) includes a combustion chamber (201) and a material storage pipe (207). The combustion chamber (201) is movably installed in the middle of the inner cavity of the casing (18) and the combustion chamber (201) has a hemispherical structure. The material storage pipe (207) is movably installed in the middle of the bottom end of the inner cavity of the combustion chamber (201). The exhaust mechanism (5) is movably installed in the middle of the bottom end of the inner cavity of the storage tube (207). The exhaust mechanism (5) includes a servo motor (501), which is movably installed in the middle of the bottom end of the inner cavity of the storage tube (207). A fixing ring (15) is movably mounted on the top of the combustion chamber (201); Uniform heating mechanism (3), several uniform heating mechanisms (3) are movably installed inside the fixed ring (15). The uniform heating mechanism (3) includes heat exchange tubes (301) and arc-shaped heat receiving plates (304). Several heat exchange tubes (301) are movably installed inside the fixed ring (15), and several arc-shaped heat receiving plates (304) are movably installed around the outside of the heat exchange tubes (301). Fixing mechanism (4), a plurality of fixing mechanisms (4) are movably installed at the middle of one end of the arc-shaped heating plate (304) away from the heat exchange tube (301), the fixing mechanism (4) includes a second fixing plate (401), the second fixing plate (401) is movably installed at the middle of one end of the arc-shaped heating plate (304) away from the heat exchange tube (301).

2. The methanol combustion heating device for an automobile water tank according to claim 1, characterized in that: The exhaust mechanism (5) further includes a rotating rod (502), a fan blade (503), and a vent plate (504). The rotating rod (502) is bolted to the top of the output shaft of the servo motor (501). The fan blade (503) is bolted to the top of the rotating rod (502) and is located in the middle of the inner cavity of the storage tube (207). The vent plate (504) is bolted to the top of the storage tube (207) and has several first vent holes around the top of the vent plate (504). Several second vent holes (17) are opened in the middle of the bottom of the combustion chamber (201) and are located directly below the storage tube (207). An air intake pipe (13) is bolted to the middle of the bottom of the combustion chamber (201).

3. The methanol combustion heating device for an automobile water tank according to claim 2, characterized in that: The storage tube (207) has a storage space inside, and a feed inlet is provided on the right side of the bottom end of the storage tube (207). A feed tube (14) is installed inside the feed inlet by bolts. A first fixing hole is provided on the right side of the bottom end of the combustion chamber (201). The bottom end of the feed tube (14) passes through the first fixing hole. A solenoid valve (16) is installed on the middle of the outer side of the feed tube (14) by bolts.

4. A methanol combustion heating device for an automotive water tank according to claim 1, characterized in that: The combustion mechanism (2) further includes a combustion plate (202), a flame nozzle (203), an ignition device (204), a feed pipe (205), a heat collection plate (206), and a feed hole (208). Several combustion plates (202) are bolted to the periphery of the combustion chamber (201), and several heat collection plates (206) are bolted to the middle of both sides of the combustion plate (202). An installation groove is provided in the middle of the inner cavity of the combustion plate (202). The feed pipe (205) is bolted to the... Inside the loading slot, several flame nozzles (203) are bolted to the top of the feed pipe (205), and the ignition device (204) is bolted to the middle of the top of the combustion plate (202). Several discharge ports are opened around the outside of the storage pipe (207), and several feed holes (208) are opened at the end of the combustion plate (202) near the discharge port of the storage pipe (207), and the feed holes (208) are fitted with the discharge ports. The feed pipe (205) is connected to the feed holes (208).

5. A methanol combustion heating device for an automotive water tank according to claim 1, characterized in that: An mounting ring (19) is bolted to the middle of the outer side of the combustion chamber (201). A fourth fixing plate (20) is bolted to the outer periphery of the mounting ring (19). The end of the fourth fixing plate (20) away from the combustion chamber (201) is bolted to the middle of the inner cavity of the casing (18).

6. A methanol combustion heating device for an automotive water tank according to claim 1, characterized in that: The uniform heating mechanism (3) further includes outer fins (302), connecting pipes (303) and inner fins (305). Several outer fins (302) are bolted to both sides of the arc-shaped heating plate (304). Several connecting pipes (303) are bolted to the front and rear ends of the heat exchange tube (301). The front and rear ends of the inner cavity of the fixing ring (15) are provided with second fixing holes, and several heat exchange tubes (301) pass through the second fixing holes. Several inner fins (305) are bolted to the periphery of the inner cavity of the heat exchange tube (301).

7. A methanol combustion heating device for an automotive water tank according to claim 3 or 6, characterized in that: The heat exchange tube (301) on the left side is bolted to a water inlet pipe (8), and the heat exchange tube (301) on the right side is bolted to a water outlet pipe (9). The water inlet pipe (8) and the water outlet pipe (9) pass through the second fixing hole. The water inlet pipe (8), the water outlet pipe (9), the air inlet pipe (13), and the feed pipe (14) pass through the casing (18). The casing (18) is bolted to a mounting plate (11) at the front middle. The mounting plate (11) is bolted to a water pump (12) at the top middle. The water pump (12) is bolted to the water inlet pipe (8). The water outlet pipe (9) is bolted to a temperature sensor (10) at the front end.

8. A methanol combustion heating device for an automotive water tank according to claim 1, characterized in that: The fixing mechanism (4) further includes a third fixing plate (402) and a U-shaped fixing plate (403). The third fixing plate (402) is bolted to both sides of the second fixing plate (401), and the bottom end of the third fixing plate (402) is bolted to the middle of the arc-shaped heating plate (304) away from the heat exchange tube (301). The inner cavity of the U-shaped fixing plate (403) is bolted to the end of the second fixing plate (401) away from the heat exchange tube (301), and the bottom end of the U-shaped fixing plate (403) is bolted to the end of the third fixing plate (402) away from the heat exchange tube (301).

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