A heat exchanger with a protective structure

Abstract

This invention belongs to the field of energy-saving heat exchange technology, specifically a heat exchanger with a protective structure, including a heat exchange box. Heat exchange tubes are fixedly connected to the combustion chamber inside the heat exchange box. A purified water pump pumps circulating cleaning fluid to backwash the inner wall of the heat exchange tubes to remove scale, thus protecting the inner wall of the heat exchange tubes from scale buildup and ensuring efficient heat transfer and reduced energy consumption. By using the heat exchange tubes inside the heat exchanger as a circulation channel for the cleaning agent in a counter-current flush, the reverse flow of the cleaning agent impacts the weak points of scale buildup on the tube wall. Scale, which usually deposits in the direction of flow, is more easily peeled off in the reverse flow, effectively removing stubborn scale. Utilizing the heat exchange tubes as the circulation channel for scale removal, the cleaning agent is directly pumped into the existing piping system, eliminating the need for disassembling the heat exchanger end caps and tube bundles as in traditional models, achieving a non-disassembly cleaning function. This heat exchanger is suitable for home and commercial use, and is particularly applicable to continuous production in the chemical and power industries.

Description

Technical Field

[0001] This invention belongs to the field of energy-saving heat exchange technology, specifically a heat exchanger with a protective structure. Background Technology

[0002] A heat exchanger with a protective structure is an enhanced heat exchange device designed for harsh working conditions. Its core feature is the addition of a multi-layered protection system around the traditional heat exchange unit and in key areas. It typically uses a composite protective barrier consisting of a corrosion-resistant alloy shell, an anti-erosion liner, and a shock-resistant buffer layer. The internal heat exchange tubes are equipped with a wear-resistant coating, which significantly extends the equipment's lifespan and maintains the stability of heat exchange efficiency.

[0003] A Chinese patent with publication number CN223165986U discloses a plate heat exchanger with a protective structure, including a heat exchanger and a pressure plate. The pressure plate includes a fixed pressure plate on one side and a movable pressure plate on the other side. By setting a protective plug-in plate, this application can reduce the corrosion and impact damage caused by the external environment to the plate and improve the protection effect of the plate.

[0004] In the application of energy-saving heat exchangers, the design of the protective structure is of great significance to ensure the efficient operation of the equipment and extend its service life. The protective structure of the aforementioned heat exchanger plays a key role in resisting corrosion and impact damage. This protection can improve its durability and reliability. However, in the actual use of traditional energy-saving heat exchangers, impurities and dissolved substances in the fluid are prone to scale formation on the inner wall of the heat exchange tubes after long-term use, which leads to a decrease in heat transfer efficiency and an increase in energy consumption, making it difficult to effectively protect the inner wall of the heat exchange tubes.

[0005] Therefore, the present invention provides a heat exchanger with a protective structure. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A heat exchanger with a protective structure, as described in the present invention, includes a heat exchange box; a heat exchange tube is fixedly connected to the internal combustion chamber of the heat exchange box; a first connecting block is fixedly connected to the bottom end of the heat exchange tube; a water inlet pipe is fixedly connected to one side of the first connecting block through a first valve; a second connecting block is fixedly connected to the top end of the heat exchange tube; a water outlet pipe is fixedly connected to the second connecting block through a second valve; a purified water pump is fixedly connected to the outer wall of the heat exchange box, and the input end of the purified water pump is connected to the first connecting block, and the output end of the purified water pump is connected to the second connecting block.

[0008] Preferably, both the inner walls of the first connecting block and the second connecting block are slidably connected to a sealing block; the sealing block has a flow hole; the outer wall of the sealing block is fixedly connected to a connecting plate; and the outer wall of the connecting plate is fixedly connected to a first sealing plate.

[0009] Preferably, the outer walls of both the first and second connecting blocks are fixedly connected to a limiting frame, and the limiting frame has three limiting holes; the inner wall of the connecting plate is slidably connected to a protruding rod through a first elastic element, and the protruding rod corresponds to the limiting hole.

[0010] Preferably, a feed box is fixedly connected to the second connecting block, and the feed box is connected to the second connecting block; the feed box is composed of a horn tube and an inclined tube, and the inclined tube is fixedly connected between the second connecting block and the horn tube.

[0011] Preferably, the inner wall of the feed box is rotatably connected to a rotating shaft via a torsion spring; a second sealing plate is fixedly connected to the outer wall of the rotating shaft.

[0012] Preferably, a storage box is fixedly connected to the bottom end of the first connecting block, and an inclined groove is provided at the bottom end of the first connecting block, which is connected to the storage box; a sealing plate is slidably connected to the inner wall of the storage box.

[0013] Preferably, a sliding rod is fixed to the outer wall of the sealing plate; a second elastic element is sleeved on the sliding rod.

[0014] Preferably, a flow control plate is slidably connected to the inner wall of the storage box; the flow control plate has a square groove, and the square groove is located at the inclined groove.

[0015] Preferably, the flow control plate can divide the interior of the storage box into a storage slot and a temporary storage slot, with the storage slot and the temporary storage slot located on the bottom and end faces of the flow control plate, respectively.

[0016] Preferably, the heat exchange tube is composed of multiple inclined tubes and bent tubes, and the ends of two inclined tubes that are close to each other are connected by a bent tube.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The heat exchanger with a protective structure described in this invention uses a purified water pump to pump circulating cleaning fluid for backwashing and descaling of the inner wall of the heat exchange tubes, thus protecting the inner wall of the heat exchange tubes from scaling and ensuring efficient heat transfer and reduced energy consumption. By using the heat exchange tubes inside the heat exchanger as the circulation channel for the cleaning agent in a counter-current flushing process, the reverse flow of the cleaning agent impacts the weak points of scale buildup on the tube wall. While scale typically deposits in the direction of flow, the reverse flow makes it easier to peel off, effectively removing stubborn scale. Utilizing the heat exchange tubes as the descaling circulation channel allows for direct pumping of the cleaning agent using existing piping systems, eliminating the need for traditional methods. The process of disassembling the heat exchanger end caps and tube bundles eliminates the need for disassembly and cleaning. This heat exchanger is suitable for both residential and commercial use, and is particularly applicable to the continuous production industries of chemicals and power plants, shortening maintenance cycles. It uses a pump-driven circulation flushing method to remove dirt from the inner wall of the heat exchange tubes. Compared to brushing and high-pressure water jetting, chemical cleaning combined with reverse circulation causes less physical wear on the tube walls, making it especially suitable for thin-walled tubes and copper tubes, which are prone to damage. The circulating flow can cover all pipes, avoiding missed areas during cleaning. A sensor can be added to the purified water pump for precise control, reducing ineffective cleaning time and achieving high efficiency and energy saving.

[0019] 2. The heat exchanger with a protective structure described in this invention cleans stubborn dirt from the inner wall of the heat exchange tubes by pouring small steel shot from the feed box into the heat exchange tubes and allowing it to roll down from top to bottom through friction. This reduces the adhesion of stubborn dirt and improves the cleaning and protection effect on the inner wall of the heat exchange tubes. The sliding sealing block limits the protruding rod to the second limiting hole on the limiting frame, allowing for the cleaning of steel shot alone. By using the sliding sealing block to limit the protruding rod to the third limiting hole on the limiting frame, steel shot can be added while circulating cleaning fluid is pumped into the heat exchange tubes. The circulating cleaning fluid can perform circulating rinsing, and when the steel shot reaches the inclined groove, it can roll into the storage box due to gravity for temporary storage, achieving a dual cleaning effect on the inner wall of the heat exchange tubes. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a schematic diagram of the heat exchange tube structure in this invention;

[0023] Figure 3 This is a schematic diagram of the purification box in this invention;

[0024] Figure 4 This is a partial structural cross-sectional view of the feed box in this invention;

[0025] Figure 5 This is a schematic diagram of the sealing block in this invention;

[0026] Figure 6 This is a partial structural cross-sectional view of the storage box in this invention;

[0027] Figure 7 This is a schematic diagram of the flow control plate in this invention.

[0028] In the diagram: 1. Heat exchanger box; 11. Heat exchange tube; 13. Connecting block No. 1; 14. Inlet pipe; 15. Connecting block No. 2; 16. Outlet pipe; 17. Purified water pump; 2. Blocking block; 21. Flow hole; 22. Connecting plate; 23. Blocking plate No. 1; 3. Limiting frame; 31. Protruding rod; 4. Feed box; 5. Rotating shaft; 51. Blocking plate No. 2; 6. Storage box; 61. Sealing plate; 7. Sliding rod; 8. Flow control plate. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0030] like Figures 1 to 4 , Figure 6As shown in the embodiment of the present invention, a heat exchanger with a protective structure includes a heat exchange box 1; a heat exchange tube 11 is fixedly connected to the internal combustion chamber of the heat exchange box 1; a first connecting block 13 is fixedly connected to the bottom end of the heat exchange tube 11; a water inlet pipe 14 is fixedly connected to one side of the first connecting block 13 through a first valve; a second connecting block 15 is fixedly connected to the top end of the heat exchange tube 11; a water outlet pipe 16 is fixedly connected to the second connecting block 15 through a second valve; a purified water pump 17 is fixedly connected to the outer wall of the heat exchange box 1, and the input end of the purified water pump 17 is connected to the first connecting block 13, purifying water... The output end of pump 17 is connected to the second connecting block 15. In the application of an energy-saving heat exchanger with a protective structure, the heat exchange tube 11 is fixed to the outer wall of the combustion chamber inside the heat exchange box 1. The cold water pipe is connected to the inlet pipe 14, and the water supply pipe is connected to the outlet pipe 16. When the energy-saving heat exchanger is working normally, the purified water pump 17 is in a stopped state, and the two ends of the purified water pump 17 are not connected. The combustion chamber of the heat exchange box 1 generates heat, and the first valve of the inlet pipe 14 and the second valve of the outlet pipe 16 are opened. At this time, the inlet pipe 14 can pass through the first connecting block 13, the heat exchange tube 11, and the second connecting block 16. 5 is connected to the outlet pipe 16. Cold water enters from the inlet pipe 14 and reaches the heat exchange tube 11 for heat exchange, and then hot water is discharged from the outlet pipe 16. When cleaning the dirt on the inner wall of the heat exchange tube 11 of the energy-saving heat exchanger, first close valve 1, pour the circulating cleaning agent into the heat exchange tube 11 from the outlet pipe 16, and then close valve 2. The circulating cleaning agent will flush the dirt on the inner wall of the heat exchange tube 11 from top to bottom. Because the pipeline of the heat exchange tube 11 is long and curved, the top-down flushing method can reduce the energy consumption generated by bottom-up pumping, thus achieving an energy-saving effect. The circulating cleaning agent flushing reduces The low adhesion of dirt causes it to fall off. As the circulating cleaning agent falls into the first connecting block 13, the purification water pump 17 draws out the circulating cleaning agent inside the first connecting block 13 for filtration, and then pumps it from the top of the purification water pump 17 to the second connecting block 15 for circulation. The inner wall of the heat exchange tube 11 has a wear-resistant coating, and repeated pumping and rinsing does not affect the subsequent heat exchange. After self-cleaning, the first valve is opened, and impurities and circulating cleaning agent are discharged from the inlet pipe 14. This plays a role in circulating descaling and protecting the inner wall of the heat exchange tube 11, ensuring the heat transfer efficiency of the heat exchange tube 11 and reducing energy consumption.

[0031] By using the heat exchange tube 11 inside the heat exchanger as a cleaning agent circulation channel for counter-current flushing, the reverse flow of the cleaning agent can impact the weak surface of the scale buildup on the tube wall. The scale layer usually deposits in the direction of flow, and the reverse flow makes it easier to peel off, effectively removing stubborn scale.

[0032] Using heat exchange tube 11 as the descaling circulation channel, the cleaning agent is directly pumped in using the existing pipeline system, saving the time of disassembling the heat exchanger end cap and tube bundle of traditional models, thus achieving the function of cleaning without disassembly. This heat exchanger is suitable for home and commercial use, especially for the chemical and power industries with continuous production, and shortens the maintenance cycle.

[0033] The method of using pump-driven circulation flushing to remove dirt from the inner wall of heat exchange tube 11 is more effective than brushing or high-pressure water jetting. Chemical cleaning combined with reverse circulation causes less physical wear on the tube wall, making it especially suitable for thin-walled tubes and copper tubes, which are prone to damage. The circulating flow can cover all pipes, avoiding missed areas during cleaning. A sensor can be added to the purification pump 17 for precise control, reducing ineffective cleaning time and achieving high efficiency and energy saving.

[0034] like Figures 1 to 6 As shown, both the inner walls of the first connecting block 13 and the second connecting block 15 are slidably connected to sealing blocks 2; each sealing block 2 has a flow hole 21; a connecting plate 22 is fixedly connected to the outer wall of the sealing block 2; a first sealing plate 23 is fixedly connected to the outer wall of the connecting plate 22; when the energy-saving heat exchanger is working, the two sealing blocks 2 inside the first connecting block 13 and the second connecting block 15 slide, and the two sealing blocks 2 are fixed after approaching the inlet pipe 14 and the outlet pipe 16, so that the two sealing blocks 2 respectively block the first connecting block 13 and the second connecting block 15. The channel between the No. 15 connecting block and the purified water pump 17 is blocked, and the cold water is discharged after heat exchange through the heat exchange tube 11. When cleaning the dirt on the inner wall of the heat exchange tube 11 of the energy-saving heat exchanger, hold the two connecting plates 22 and pull the two blocking blocks 2 in the opposite direction. The two No. 1 blocking plates 23 block the No. 1 connecting block 13 and the No. 2 connecting block 15 respectively. At this time, the No. 1 valve and the No. 2 valve are closed, and the circulating cleaning liquid can achieve the connection and circulation of the pipeline through the two flow holes 21, which plays the role of controlling the connection at both ends of the purified water pump 17.

[0035] The outer walls of both the first connecting block 13 and the second connecting block 15 are fixedly connected to a limiting frame 3, and the limiting frame 3 has three limiting holes. The inner wall of the connecting plate 22 is slidably connected to a protruding rod 31 through a first elastic element, and the protruding rod 31 corresponds to the limiting hole. When the sealing block 2 slides, the protruding rod 31 is first squeezed out of one limiting hole, the first elastic element contracts and is subjected to force, and then the connecting plate 22 is held and the sealing block 2 is pulled to slide until the first elastic element springs back to its original position and squeezes the protruding rod 31 into another limiting hole for limitation. There are three limiting holes, and each limiting hole can limit the sliding distance of the sealing block 2, which plays the role of limiting the sealing block 2 after it slides.

[0036] like Figures 1 to 4As shown, a feed box 4 is fixedly connected to the second connecting block 15, and the feed box 4 is connected to the second connecting block 15. The feed box 4 is composed of a horn and an inclined cylinder, with the inclined cylinder fixed between the second connecting block 15 and the horn. When adding circulating cleaning fluid to the heat exchanger, first close valves 1 and 2, open the connection between the two ends of the purification water pump 17, and change the flow of circulating cleaning fluid from the original outlet pipe 16 to the horn of the feed box 4. The circulating cleaning fluid flows into the second connecting block 15 and the heat exchange tube 11 along the inclined cylinder. Then, the top of the feed box 4 is sealed, and the purification water pump 17 pumps to perform circulating flushing, which serves to add circulating cleaning fluid.

[0037] The inner wall of the feed box 4 is rotatably connected to the rotating shaft 5 via a torsion spring; the outer wall of the rotating shaft 5 is fixedly connected to a second sealing plate 51; when the circulating cleaning fluid is added into the horn of the feed box 4, the second sealing plate 51 is pressed down during the pouring process of the circulating cleaning fluid and rotates with the rotating shaft 5, the torsion spring contracts and is subjected to force until the circulating cleaning fluid is added. Then the torsion spring drives the rotating shaft 5 and the second sealing plate 51 to reset. Since the bottom of the horn of the feed box 4 protrudes and blocks the second sealing plate 51, the circulating cleaning fluid can only be added from the feed box 4 and cannot flow back out, which reduces the backflow of the circulating cleaning fluid from the feed box 4 when pumping.

[0038] like Figures 1 to 3 , Figure 6 As shown, a storage box 6 is fixedly connected to the bottom end of the first connecting block 13, and an inclined groove is opened at the bottom end of the first connecting block 13, which is connected to the storage box 6; a sealing plate 61 is slidably connected to the inner wall of the storage box 6; when descaling the inner wall of the heat exchange tube 11, stubborn dirt is easily attached to the inner wall of the heat exchange tube 11 and is difficult to clean. Small steel shot is poured into the second connecting block 15 from the feed box 4. The feed point of the small steel shot and the feed point of the circulating cleaning liquid are the same. The steel shot rolls down the inner wall of the heat exchange tube 11 from top to bottom, which can clean the stubborn dirt on the inner wall of the heat exchange tube 11. The steel shot falls from the heat exchange tube 11 into the first connecting block 13, and then falls into the storage box 6 along the inclined groove for temporary storage. After cleaning, the sealing plate 61 is opened and the steel shot is taken out, which reduces the adhesion of stubborn dirt and improves the cleaning and protection effect on the inner wall of the heat exchange tube 11.

[0039] After the sliding sealing block 2 is used, the protruding rod 31 is limited to the second limiting hole on the limiting frame 3. At this time, the sealing block 2 in the second connecting block 15 can connect the second connecting block 15 to the feed box 4, but the second connecting block 15 is not connected to the purified water pump 17. The sealing block 2 in the first connecting block 13 can connect the first connecting block 13 to the storage box 6, but the first connecting block 13 is not connected to the purified water pump 17. It can be used alone for the cleaning method of steel shot.

[0040] After using the sliding sealing block 2, the protruding rod 31 is limited to the third limiting hole on the limiting frame 3. At this time, both ends of the purified water pump 17 are connected to the first connecting block 13 and the second connecting block 15. The first valve and the second valve are closed, so that the circulating cleaning liquid can be pumped into the heat exchange tube 11 while steel shot is added. The circulating cleaning liquid can be circulated and rinsed, and when the steel shot reaches the inclined groove, it can roll into the storage box 6 due to gravity for temporary storage, which plays a role in double cleaning of the inner wall of the heat exchange tube 11.

[0041] like Figures 1 to 3 , Figure 6 , Figure 7 As shown, a sliding rod 7 is fixed to the outer wall of the sealing plate 61; a second elastic element is sleeved on the sliding rod 7; when the steel shot inside the storage box 6 is removed, the sealing plate 61 is pulled and slid out of the storage box 6 in the opposite direction, and the sliding rod 7 is pulled simultaneously. The second elastic element is squeezed against the outer wall of the storage box 6 and contracts under force. After the steel shot is removed, the sealing plate 61 is released, and then the second elastic element drives the sliding rod 7 and the sealing plate 61 to reset, which plays the role of removing steel shot from the storage box 6.

[0042] A flow control plate 8 is slidably connected to the inner wall of the storage box 6. The flow control plate 8 has a square groove, which is located at the inclined groove. When too much steel shot is stored in the storage box 6, the sealing plate 61 is pulled out of the storage box 6. The flow control plate 8 slides synchronously with the sealing plate 61. The flow control plate 8 can block the inclined groove of the first connecting block 13, so that the circulation of the cleaning fluid is not affected when the steel shot is taken out. After the sealing plate 61 is reset, the square groove of the flow control plate 8 corresponds to the inclined groove, and the steel shot continues to fall into the storage box 6 from the inclined groove, which plays the role of controlling and blocking the inclined groove of the first connecting block 13.

[0043] The flow control plate 8 can divide the interior of the storage box 6 into a storage tank and a temporary storage tank, which are located on the bottom and end faces of the flow control plate 8, respectively. When steel shot is taken from the storage box 6, the flow control plate 8 slides to seal the interior of the storage box 6, dividing it into two parts. The upper part of the flow control plate 8 is the temporary storage tank, where the remaining steel shot in the heat exchange tube 11 rolls down to the temporary storage tank for temporary storage. The steel shot in the storage tank is taken out from the sealing plate 61, which can reduce the discharge of circulating cleaning fluid while ensuring the collection of steel shot.

[0044] like Figure 1 and Figure 2As shown, the heat exchange tube 11 is composed of multiple inclined tubes and bends, and the ends of two inclined tubes that are close to each other are connected by a bend. When the inner wall of the heat exchange tube 11 is cleaned with circulating cleaning fluid and steel shot, the circulating cleaning fluid can flow along the channel formed by the multiple inclined tubes and bends, effectively reducing the energy consumption of pumping from bottom to top. When cleaning stops, the circulating cleaning fluid in the heat exchange tube 11 automatically flows out from top to bottom, achieving an energy-saving effect. As for the steel shot rolling down in the heat exchange tube 11, due to the inclined tube setting of the heat exchange tube 11, the steel shot can be quickly fed down along the inclined tube, reducing the accumulation of steel shot in the heat exchange tube 11.

[0045] Working process: In the application of an energy-saving heat exchanger with a protective structure, the heat exchange tube 11 is fixed to the outer wall of the combustion chamber inside the heat exchange box 1. The cold water pipe is connected to the inlet pipe 14, and the water supply pipe is connected to the outlet pipe 16. When the energy-saving heat exchanger is working normally, the purified water pump 17 is in a stopped state, and the two ends of the purified water pump 17 are not connected. Heat is generated in the combustion chamber of the heat exchange box 1. The first valve of the inlet pipe 14 and the second valve of the outlet pipe 16 are opened. At this time, the inlet pipe 14 can be connected to the outlet pipe 16 through the first connecting block 13, the heat exchange tube 11, and the second connecting block 15. Cold water enters from the inlet pipe 14 and reaches the heat exchange tube 11 for heat exchange. Then, hot water flows out from the outlet pipe. The cleaning agent is discharged from pipe 16. When cleaning the inner wall of the heat exchange tube 11 of the energy-saving heat exchanger, first close valve 1, pour the circulating cleaning agent into the heat exchange tube 11 from outlet pipe 16, then close valve 2. The circulating cleaning agent will flush the inner wall of the heat exchange tube 11 from top to bottom. Because the pipe of the heat exchange tube 11 is long and curved, flushing from top to bottom can reduce the energy consumption generated by pumping from bottom to top, thus achieving an energy-saving effect. The circulating cleaning agent reduces the adhesion of the dirt and makes it fall off. After the circulating cleaning agent falls into the first connecting block 13, the purified water pump 17 draws the circulating cleaning agent inside the first connecting block 13 for filtration, and then the purified water pump 17 pushes the cleaning agent out. The cleaning agent is pumped to the second connecting block 15 for circulation. The inner wall of the heat exchange tube 11 has a wear-resistant coating, so repeated pumping and rinsing does not affect subsequent heat exchange. After self-cleaning, opening valve 1 allows impurities and circulating cleaning agent to be discharged from the inlet pipe 14, thus protecting the inner wall of the heat exchange tube 11 by circulating descaling and ensuring the heat transfer efficiency and energy consumption reduction of the heat exchange tube 11. By using the heat exchange tube 11 inside the heat exchanger as a circulation channel for counter-current rinsing, the reverse flow of the cleaning agent can impact the weak points of scale buildup on the tube wall. Scale usually deposits in the direction of flow, but reverse flow makes it easier to peel off, effectively removing stubborn scale. Utilizing the heat exchange tube 11 as a descaling circulation channel directly utilizes... By pumping cleaning agent into the existing pipeline system, the time spent disassembling the heat exchanger end caps and tube bundles in traditional models is eliminated, achieving a non-disassembly cleaning effect. This heat exchanger is suitable for home and commercial use, and is especially applicable to the continuous production chemical and power industries, shortening the maintenance cycle. The pumped circulation flushing method treats the dirt on the inner wall of the heat exchange tube 11. Compared with brushing and high-pressure water jetting, chemical cleaning combined with reverse circulation causes less physical wear on the tube wall, making it particularly suitable for thin-walled tubes and copper tubes and other easily damaged materials. The circulating flow can cover all pipes, avoiding local cleaning omissions. A sensor can be added to the purification water pump 17 for precise control, reducing ineffective cleaning time and achieving high efficiency and energy saving.When the energy-saving heat exchanger is working, the two sealing blocks 2 inside the sliding connection block 13 and the connection block 15 are fixed near the inlet pipe 14 and the outlet pipe 16, respectively, so that the two sealing blocks 2 block the channels between the connection block 13 and the connection block 15 and the purified water pump 17. Cold water is discharged after heat exchange through the heat exchange tube 11. When cleaning the dirt on the inner wall of the heat exchange tube 11 of the energy-saving heat exchanger, the two connecting plates 22 are held and the two sealing blocks 2 are pulled in opposite directions. The two sealing plates 23 block the connection block 13 and the connection block 15 respectively. When valves 1 and 2 are closed, the circulating cleaning fluid can circulate and flush the pipeline through the two flow holes 21, thus controlling the connection between the two ends of the purified water pump 17. When the sealing block 2 slides, the protrusion 31 is first squeezed out of one limiting hole, the first elastic element contracts and is subjected to force, and then the connecting plate 22 is held to pull the sealing block 2 to slide until the first elastic element springs back to its original position and squeezes the protrusion 31 into another limiting hole for limitation. There are three limiting holes, each of which can limit the sliding distance of the sealing block 2, thus limiting the sliding of the sealing block 2.

[0046] When adding circulating cleaning fluid into the heat exchanger, first close valves one and two, open the connection between the two ends of the purified water pump 17, and change the flow of the circulating cleaning fluid from the original outlet pipe 16 to the flared end of the feed box 4. The circulating cleaning fluid flows along the inclined tube into the interior of the second connecting block 15 and the heat exchange tube 11. Then, seal the top of the feed box 4, and pump the purified water pump 17 to circulate and flush, which serves to add circulating cleaning fluid. When the circulating cleaning fluid is added into the flared end of the feed box 4, the second sealing plate 51 is pressed down during the process of the circulating cleaning fluid being poured in, and rotates with the rotating shaft 5. The torsion spring contracts and is subjected to force until the circulating cleaning fluid is added. Then, the torsion spring drives the rotating shaft 5 and the second sealing plate 51 to reset. Since the bottom of the flared end of the feed box 4 protrudes and seals the second sealing plate 51, the circulating cleaning fluid can only be added from the feed box 4 and cannot flow back out, which reduces the backflow of the circulating cleaning fluid from the feed box 4 when pumping.

[0047] When descaling the inner wall of heat exchange tube 11, stubborn dirt easily adheres to the inner wall and is difficult to clean. Small steel shot is poured into the second connecting block 15 from the feed box 4. The feed point for the small steel shot and the circulating cleaning fluid is the same. The steel shot rubs and rolls down the inner wall of heat exchange tube 11 from top to bottom, effectively cleaning the stubborn dirt. The steel shot falls from the heat exchange tube 11 into the first connecting block 13, and then flows down the inclined groove into the storage box 6 for temporary storage. After the shot is removed, the sealing plate 61 can be opened to remove the steel shot, reducing the adhesion of stubborn dirt and improving the cleaning and protection effect on the inner wall of the heat exchange tube 11. The sliding sealing block 2 then limits the protruding rod 31 to the second limiting hole on the limiting frame 3. At this time, the sealing block 2 in the second connecting block 15 allows the second connecting block 15 to connect with the feed box 4, but the second connecting block 15 is not connected to the purified water pump 17. The sealing block 2 in the first connecting block 13 allows the first connecting block 13 to connect with the storage... Box 6 is connected, while connecting block 13 is not connected to the water purification pump 17 and can be used independently for steel shot cleaning. After using sliding sealing block 2, the protruding rod 31 is limited to the third limiting hole on the limiting frame 3. At this time, both ends of the water purification pump 17 are connected to connecting block 13 and connecting block 15. Valve 1 and valve 2 are closed, allowing the circulating cleaning liquid to be pumped into the heat exchange tube 11 while steel shot is added. The circulating cleaning liquid can be used for circulating rinsing, and when the steel shot reaches the inclined groove, it can roll into the storage box 6 due to gravity for temporary storage, which plays a role in double cleaning of the inner wall of the heat exchange tube 11. When the steel shot is taken out of the storage box 6, the sealing plate 61 is pulled and slid out of the storage box 6 in the opposite direction. The sliding rod 7 is pulled at the same time, and the second elastic element is squeezed against the outer wall of the storage box 6 and contracts under force. After the steel shot is taken out, the sealing plate 61 is released, and then the second elastic element drives the sliding rod 7 and the sealing plate 61 to reset, which plays a role in taking out the steel shot from the storage box 6.

[0048] When the storage box 6 contains too much steel shot, the sealing plate 61 is pulled out of the storage box 6. The flow control plate 8 slides synchronously with the sealing plate 61. The flow control plate 8 can block the inclined groove of the first connecting block 13, so that the circulation of the cleaning fluid is not affected when the steel shot is taken out. After the sealing plate 61 is reset, the square groove of the flow control plate 8 corresponds to the inclined groove, and the steel shot continues to fall into the storage box 6 from the inclined groove, which plays the role of controlling and blocking the inclined groove of the first connecting block 13. When the steel shot in the storage box 6 is taken out, the flow control plate 8 slides to block the inside of the storage box 6, dividing it into two parts. The upper part of the flow control plate 8 is the temporary storage tank. The remaining steel shot in the heat exchange tube 11 rolls into the temporary storage tank for temporary storage, while the steel shot in the storage tank is taken out from the sealing plate 61, which can reduce the discharge of the circulating cleaning fluid while ensuring the collection of steel shot.

[0049] When the inner wall of the heat exchange tube 11 is cleaned with circulating cleaning fluid and steel shot, the circulating cleaning fluid can flow along the channel formed by multiple inclined tubes and bends, effectively reducing the energy consumption of bottom-up pumping. When cleaning stops, the circulating cleaning fluid in the heat exchange tube 11 automatically flows out from top to bottom, achieving an energy-saving effect. As for the steel shot rolling down inside the heat exchange tube 11, the inclined tube setting of the heat exchange tube 11 allows the steel shot to be quickly fed down along the inclined tube, reducing the accumulation of steel shot inside the heat exchange tube 11.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat exchanger with a protective structure, characterized in that: The device includes a heat exchange box; a heat exchange tube is fixedly connected to the internal combustion chamber of the heat exchange box; a first connecting block is fixedly connected to the bottom end of the heat exchange tube; a water inlet pipe is fixedly connected to one side of the first connecting block through a first valve; a second connecting block is fixedly connected to the top end of the heat exchange tube; a water outlet pipe is fixedly connected to the second connecting block through a second valve; a purified water pump is fixedly connected to the outer wall of the heat exchange box, and the input end of the purified water pump is connected to the first connecting block, and the output end of the purified water pump is connected to the second connecting block. Both the inner walls of the first connecting block and the second connecting block are slidably connected to a sealing block; the sealing block has a flow hole; the outer wall of the sealing block is fixedly connected to a connecting plate; the outer wall of the connecting plate is fixedly connected to a first sealing plate; The outer walls of both the first and second connecting blocks are fixedly connected to a limiting frame, and the limiting frame has three limiting holes; the inner wall of the connecting plate is slidably connected to a protruding rod through a first elastic element, and the protruding rod corresponds to the limiting hole. A storage box is fixedly connected to the bottom end of the first connecting block, and an inclined groove is opened at the bottom end of the first connecting block, which is connected to the storage box; a sealing plate is slidably connected to the inner wall of the storage box. A sliding rod is fixed to the outer wall of the sealing plate; a second elastic element is sleeved on the sliding rod; A flow control plate is slidably connected to the inner wall of the storage box; a square groove is provided on the flow control plate, and the square groove is located at the inclined groove.

2. A heat exchanger with a protective structure according to claim 1, characterized in that: A feed box is fixedly connected to the second connecting block, and the feed box is connected to the second connecting block; the feed box is composed of a horn tube and an inclined tube, and the inclined tube is fixedly connected between the second connecting block and the horn tube.

3. A heat exchanger with a protective structure according to claim 2, characterized in that: The inner wall of the feed box is rotatably connected to a rotating shaft via a torsion spring; a second sealing plate is fixed to the outer wall of the rotating shaft.

4. A heat exchanger with a protective structure according to claim 1, characterized in that: The flow control plate can divide the interior of the storage box into a storage slot and a temporary storage slot, which are located on the bottom and end faces of the flow control plate, respectively.

5. A heat exchanger with a protective structure according to claim 1, characterized in that: The heat exchange tube is composed of multiple inclined tubes and bent tubes, and the ends of two inclined tubes that are close to each other are connected by a bent tube.

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