A partitioned differential descaling enhanced heat exchange equipment for heating

Abstract

This invention proposes a zoned differentiated descaling enhanced heat exchange device for heating, comprising a support structure, a heat exchange device, and a descaling device. The support structure is located in the area where the primary heat medium network and the secondary heating network are laid out. One end of the heat exchange device is embedded in the outer wall of the support structure, and the other end of the heat exchange device extends into the support structure. The heat exchange device can heat the secondary low-temperature water entering the support structure, and at the same time, it can turbulently enhance heat exchange of the heat medium inside itself and scrape off the scale layer formed on its inner wall. The input end of the descaling device is located at the input end of the heat exchange device, and the two movable output ends of the descaling device are both sleeved on the outer wall of the other end of the heat exchange device. The descaling device can cooperate with the heat exchange device, and while the heat exchange device is operating, the two movable output ends of the descaling device can respectively scrape off the deposited scale layer generated in the upper and lower areas of the outer wall of the heat exchange device in zones and with different intensities.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, specifically to an enhanced heat exchange equipment for heating with zoned differentiated descaling, which can be applied to centralized heating heat exchange stations, industrial waste heat recovery, domestic hot water supply and other scenarios, and is adapted to the online enhanced heat exchange and automatic descaling needs of shell and tube heat exchange units. Background Technology

[0002] In centralized heating and industrial waste heat recovery systems, shell-and-tube heat exchangers are the core equipment for heat transfer. Their heat exchange efficiency and operational stability directly determine the heating quality, system energy consumption, and maintenance costs. Currently, most commonly used heating heat exchange equipment in the industry adopts a fixed shell-and-tube heat exchange structure, which has many difficult-to-solve technical defects in long-term operation: Firstly, the primary heat medium inside the pipe is prone to laminar flow, resulting in uneven local heat exchange. Furthermore, calcium and magnesium scale, corrosion products, and sludge are easily deposited on the inner wall of the pipe. The thermal resistance of the scale layer is much higher than that of the metal pipe wall, which will significantly reduce the heat transfer coefficient, leading to increased heating energy consumption and substandard terminal heating temperature. Secondly, on the secondary water side of the outer wall of the heat exchange tube, due to gravity and the difference in fluid velocity, the scale deposit in the lower half of the tube is larger, harder, and has stronger adhesion, while the scale in the upper half is thinner and has lower adhesion. Existing equipment does not have a targeted zone cleaning structure. Conventional descaling requires shutdown and disassembly followed by chemical cleaning or high-pressure water rinsing, which cannot achieve continuous operation. Mechanical scraping with a single force is prone to incomplete cleaning or damage to the anti-corrosion layer of the heat exchange tube wall. Third, existing equipment requires multiple independent drive sources for heat exchange enhancement and scale removal, resulting in complex equipment structures, numerous transmission nodes, and a high failure rate, making it difficult to meet the long-term, continuous, and stable operation requirements of heating systems. Summary of the Invention

[0003] The purpose of this invention is to provide a zoned differentiated descaling enhanced heat exchange device for heating, in order to solve the problems mentioned in the background art, such as rapid decline in heat exchange efficiency of traditional heating heat exchangers, the need to shut down for scale removal, the single cleaning force that easily damages the pipe wall, and the complex structure and high failure rate of the equipment.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a zoned differentiated descaling enhanced heat exchange device for heating, comprising a support structure, a heat exchange device, and a descaling device; the support structure is disposed in the area where the external primary heat medium network and the secondary heating network are laid out; one end of the heat exchange device is embedded in the outer wall of the support structure, and the other end of the heat exchange device extends into the support structure; the heat exchange device can heat the secondary low-temperature water entering the support structure, and at the same time, the heat exchange device can turbulently enhance heat exchange of the heat medium inside itself and scrape off the scale layer formed on its inner wall; the input end of the descaling device is disposed at the input end of the heat exchange device, and the two movable output ends of the descaling device are both sleeved on the outer wall of the other end of the heat exchange device; the descaling device can cooperate with the heat exchange device, and while the heat exchange device is operating, the two movable output ends of the descaling device can respectively scrape off the deposited scale layer generated in the upper and lower areas of the outer wall of the heat exchange device in zones and with different intensities.

[0005] By coaxially linking the drive assembly, heat exchange tubes, and turbulence-removing descaling assembly, a single power source can simultaneously achieve heat exchange through heat medium circulation, forced turbulence-based temperature equalization of the heat medium inside the tubes, and real-time scraping of scale from the inner wall, thereby enhancing the heating and heat exchange effect.

[0006] Preferably, the heat exchange device includes a drive assembly, a heat exchange tube, and a turbulence-removing and descaling assembly. The drive assembly is disposed on the outer wall of the support structure, and its output end is rotatable. One end of the heat exchange tube is sleeved on the rotating end of the drive assembly, and one end of the heat exchange tube is embedded in the outer wall of the support structure, while the other end of the heat exchange tube extends into the support structure. The heat exchange tube is connected to an external primary heat medium circulation system. The turbulence-removing and descaling assembly is disposed on the rotating end of the drive assembly. The drive assembly can drive the turbulence-removing and descaling assembly to enhance heat exchange by turbulence in the heat medium inside the heat exchange tube, and scrape off the scale layer formed on the inner wall of the heat exchange tube. By linking two sets of driven bevel gear transmission assemblies with the drive assembly, and through a torque amplification assembly to achieve power splitting and differential adjustment of output torque, the two sets of scraping assemblies are driven to complete the adaptive scraping operation of the scale layer in the upper and lower areas of the outer wall of the heat exchange tube.

[0007] Preferably, the descaling device includes a driven bevel gear transmission assembly, a torque amplification assembly, and a scraping assembly. Two sets of driven bevel gear transmission assemblies are symmetrically arranged on the outer wall of the support structure. The input ends of both sets of driven bevel gear transmission assemblies are linked to the output end of the drive assembly, thereby enabling the drive assembly to drive the output ends of both sets of driven bevel gear transmission assemblies to rotate. The torque amplification assembly is disposed on the outer wall of the support structure, and its input end is fixedly connected to the output end of one set of driven bevel gear transmission assemblies. Two sets of scraping assemblies are symmetrically arranged on the output end of the torque amplification assembly and the output end of the other set of driven bevel gear transmission assemblies. The movable output ends of the two sets of scraping assemblies are respectively sleeved on the upper and lower regions of the outer wall of the other end of the heat exchange tube. One set of scraping assemblies connected to the output end of the torque amplification assembly can perform enhanced scraping of thick, strongly adhered scale deposits in the lower region of the outer wall of the heat exchange tube, while the other set of scraping assemblies performs conventional scraping of thin, weakly adhered scale deposits in the upper region of the outer wall of the heat exchange tube.

[0008] Preferably, the support structure includes a quadruped, a support L-plate, a heat exchange chamber shell, sealing rings, and a scale interception filter. The quadruped supports the connecting components at the top. The support L-plate is disposed on one side of the outer wall of the quadruped. The heat exchange chamber shell is disposed at the top of the quadruped, and two sets of driven bevel gear transmission assemblies are symmetrically disposed on the outer wall of the heat exchange chamber shell. A through placement groove is provided on one side of the outer wall of the heat exchange chamber shell, and one end of the heat exchange tube is fitted into the placement groove. Two symmetrical circular grooves are provided on the other side of the outer wall of the heat exchange chamber shell, and the placement groove and the two circular grooves are connected to the inner cavity of the heat exchange chamber shell. There are two sealing rings, which are symmetrically fitted into the two circular grooves. The scale interception filter is fitted at the bottom of the inner wall of the heat exchange chamber shell, and there is a certain distance between the scale interception filter and the bottom surface of the inner wall of the heat exchange chamber shell, which is used to store the secondary water after heat exchange and intercept the scraped scale. By integrating and arranging the four-legged frame, heat exchange chamber shell, sealing ring and scale interception filter, a stable bearing foundation is provided for each functional component of the equipment, while ensuring the airtightness of the heat exchange chamber and realizing solid-liquid separation of the heating water and scale.

[0009] Preferably, the drive assembly includes a flat brake motor, a drive bevel gear, a support rotating rod, and a sealing rotating shaft. The flat brake motor is disposed within the wall of the support L-plate. One end of the drive bevel gear is disposed at the output end of the flat brake motor. One end of the support rotating rod is disposed at the other end of the drive bevel gear. The inner ring of the sealing rotating shaft is sleeved on the outer wall of the support rotating rod, and the outer ring of the sealing rotating shaft is sleeved on one end of the heat exchange tube. The flat brake motor can drive the support rotating rod to rotate. By transmitting power from the flat brake motor through the drive bevel gear, the support rotating rod, and the sealing rotating shaft, a single and stable power source is provided for the equipment, while ensuring the dynamic sealing performance of the heat exchange tube end and eliminating the risk of media leakage.

[0010] Preferably, the turbulence descaling assembly includes a sun gear, fixed blocks, a triangular rotating seat, planetary gears, a first gear, and a second gear. The sun gear is sleeved on the outer wall of the supporting rotating rod. There are two fixed blocks, one end of which is symmetrically arranged on the outer wall of the sun gear, and the other ends of the two fixed blocks are fixedly connected to the inner wall of the heat exchange tube. The triangular rotating seat is arranged at the other end of the supporting rotating rod. There are three planetary gears, one end of which is arranged near the three ends of the triangular rotating seat through three first bearings. All three planetary gears mesh with the sun gear. The rotation of the supporting rotating rod drives the triangular rotating seat to rotate, and drives the three planetary gears to rotate along the circumferential teeth of the sun gear. There are three first gears, one end of which is arranged at one end of the three planetary gears. The three planetary gears can drive the three first gears to rotate. There are three second gears, one end of which is arranged at the three ends of the triangular rotating seat through three second bearings. The three second gears mesh with the three first gears, and the three first gears can drive the three second gears to rotate. By meshing the sun gear with multiple planetary gears and transmitting the motion through a two-stage transmission via a triangular rotating seat, the first gear, and the second gear, the fixed-axis rotational motion is converted into a combined revolution and rotational motion at the actuator, providing a suitable action output for pipe turbulence and descaling operations.

[0011] Preferably, the turbulence-induced descaling assembly further includes extension blocks and cross scrapers; there are three extension blocks, one end of which is respectively disposed at the other end of the second gear; there are three cross scrapers, each disposed at the other end of the extension blocks. Through the cooperation of the sun gear with the three planetary gears, the three cross scrapers can be driven to contact the inner wall of the heat exchange tube, thereby enhancing heat exchange by turbulence of the heat medium inside the heat exchange tube and removing the scale layer formed on the inner wall of the heat exchange tube. By linking the cross scrapers with the extension blocks and the second gear, the cross scrapers are kept in stable contact with the inner wall of the heat exchange tube, simultaneously achieving forced turbulence and stirring of the heat medium inside the tube and circumferential, thorough scraping of the scale layer on the inner wall.

[0012] Preferably, the torque amplification assembly includes a support plate, a driving gear, a first transmission rod, a second transmission rod, and a driven gear. One end of the support plate is disposed on the outer wall of the heat exchange chamber shell. One end of the driving gear is disposed on the other end of the support plate via a third bearing, and the other end of the driving gear is connected and fixed to the output end of a set of driven bevel gear transmission assemblies. The first transmission rod is sleeved on the outer wall of the driving gear. The second transmission rod is sleeved on the other end near the support plate via a fourth bearing. The driven gear is disposed on one end of the second transmission rod. By stably mounting the driving gear and the driven gear on the outer wall of the heat exchange chamber shell via the support plate, a stable mounting support is provided for the torque amplification transmission structure, ensuring the coaxiality and operational stability of the gear meshing transmission.

[0013] Preferably, the driving gear and the driven gear contact and mesh, and the driving gear and the driven gear increase the rotational output torque of the second transmission rod through the mechanical principle of a small gear driving a large gear. By meshing the small module driving gear and the large module driven gear, the mechanical principle of gear reduction and torque increase is utilized to significantly improve the rotational torque at the output end, providing sufficient driving force for the powerful scraping of thick scale on the outer wall of the heat exchange tube.

[0014] Preferably, the scraping assembly includes a first connecting rod, a second connecting rod, a circular connecting rod, and an arc-shaped scraper; one end of the first connecting rod is disposed at the other end of the second transmission rod; one end of the second connecting rod is disposed at the other end of the first connecting rod via a fifth bearing; one end of the circular connecting rod is disposed at the other end of the second connecting rod via a sixth bearing, and the other end of the circular connecting rod is movably embedded in a sealing ring; the arc-shaped scraper is disposed at the other end of the circular connecting rod, and the arc-shaped scraper contacts the lower region of the outer wall of the heat exchange tube; the second transmission rod drives the first connecting rod to rotate, thereby driving the second connecting rod to drive the circular connecting rod to move along the inner wall of the sealing ring, thereby increasing the output torque of the circular connecting rod through the torque amplification assembly, thereby enhancing the scraping force of the thick and strongly adhered scale layer in the lower region of the outer wall of the heat exchange tube; similarly, the scraping assembly driven by another set of driven bevel gear transmission assemblies performs conventional scraping of the thin and weakly adhered scale layer in the upper region of the outer wall of the heat exchange tube. By forming a crank-connecting rod transmission mechanism consisting of a first connecting rod, a second connecting rod, a circular connecting rod, and an arc-shaped scraper, continuous rotary motion is converted into linear reciprocating scraping motion. Combined with differentiated torque output, this achieves efficient and zoned scraping of scale layers on the upper and lower areas of the outer wall of the heat exchange tube.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This equipment uses a single flat brake motor as the only power input. Through bevel gear transmission, planetary gear system, gear reduction and torque amplification, and crank-connecting rod mechanism, it achieves precise power distribution and synchronous output. It simultaneously drives three core operations: heat exchange, internal pipe turbulence descaling, and external pipe scale removal. It does not require multiple independent drive sources, reduces transmission nodes and potential failure points, and greatly improves overall operational stability, fully meeting the requirements for long-term continuous operation of the heating system.

[0016] 2. The heat exchange tubes employ a composite transmission structure of a sun gear and three planetary gears, driving three sets of cross scrapers to achieve a combined revolution and rotation motion. This significantly enhances the heat exchange uniformity of the heat medium inside the tubes, stabilizes the heat exchange state of the tube walls, achieves uniform heat transfer throughout the entire area, and greatly improves the heat transfer coefficient and heat exchange uniformity. At the same time, the cross scrapers are in close contact with the inner wall of the heat exchange tubes throughout the entire process, scraping away the scale layer on the inner wall in real time. This fundamentally avoids the problem of a sharp increase in thermal resistance and rapid decline in heat exchange efficiency caused by the thickening of the scale layer. This allows the equipment to maintain high-efficiency and stable heat exchange performance throughout the entire operating cycle, without the need for shutdown for descaling, effectively reducing the energy consumption of the heating system and improving the quality of terminal heating.

[0017] 3. Addressing the distribution characteristics of thin, weakly adhered scale layers in the upper region of heat exchange tubes during heating processes, and thick, densely packed, and strongly adhered scale layers in the lower region, this equipment utilizes a torque-enhancing component to achieve differentiated scraping power output from two paths: the upper region employs conventional torque scraping, which is energy-efficient, highly effective, and ensures thorough cleaning; the lower region undergoes powerful scraping after torque amplification via a small belt and large gear, completely removing thick scale layers and preventing localized scale buildup that could clog flow channels; the scraper is designed to closely adhere to the tube wall, ensuring cleaning effectiveness while preventing excessive scraping that could damage the tube wall's anti-corrosion layer, thus extending the service life of the heat exchange tubes and solving the industry problems of uneven cleaning and limited cleaning power in traditional equipment.

[0018] 4. Internal tube descaling and external tube scraping are completed simultaneously and online with heat exchange, without the need for machine shutdown, opening of the cover, or manual intervention. This completely solves the problems of heat interruption, reduced capacity, and high operation and maintenance costs caused by the periodic shutdown for descaling required by traditional shell and tube heat exchangers, significantly improving the continuity of heating system operation and production efficiency. The equipment adopts a double dynamic sealing design of sealed rotating shaft and cavity sealing ring, ensuring reliable sealing at the ends of heat exchange tubes and the shaft-penetrating parts of the scraping components, strictly preventing leakage of heating medium, meeting the safety requirements of closed operation of heating system, and improving operational safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the supporting structure of the present invention; Figure 3 This is a schematic diagram of the cross-section of the heat exchange cavity shell in the support structure of the present invention; Figure 4 This is a schematic diagram of the position and structure of the heat exchange device of the present invention; Figure 5 This is a schematic diagram of the internal structure of the heat exchange tube in the heat exchange device of the present invention. Figure 6 for Figure 5 Enlarged view of point A inside; Figure 7 This is a partial structural diagram of the turbulence descaling component in the heat exchange device of the present invention. Figure 8 This is a schematic diagram showing the location and structure of the descaling device within the cross-section of the heat exchange chamber shell of the present invention; Figure 9 for Figure 8 Enlarged view of point B inside; Figure 10 for Figure 8 Enlarged view of point C inside.

[0020] In the diagram: 1. Support structure, 11. Four-legged frame, 12. Support L-plate, 13. Heat exchange chamber shell, 14. Placement groove, 15. Circular groove, 16. Sealing ring, 17. Scale interception filter screen. 2. Heat exchange device; 21. Drive assembly; 211. Flat brake motor; 212. Drive bevel gear; 213. Support rotating rod; 214. Sealing rotating shaft; 22. Heat exchange tube; 23. Turbulence descaling assembly; 231. Sun gear; 232. Fixed block; 233. Triangular rotating seat; 234. Planetary gear; 235. First gear; 236. Second gear; 237. Extension block; 238. Cross scraper; 3. Descaling device, 31. Driven bevel gear transmission assembly, 32. Torque amplification assembly, 321. Bearing plate, 322. Drive gear, 323. First transmission rod, 324. Second transmission rod, 325. Driven gear, 33. Scraping assembly, 331. First connecting rod, 332. Second connecting rod, 333. Round connecting rod, 334. Arc-shaped scraper. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-10This invention provides a technical solution for a zoned differentiated descaling enhanced heat exchange device for heating: it includes a support structure 1, a heat exchange device 2, and a descaling device 3; the support structure 1 is located in the area where the primary heat medium network and the secondary heating network are laid out; one end of the heat exchange device 2 is embedded in the outer wall of the support structure 1, and the other end of the heat exchange device 2 extends into the support structure 1. The heat exchange device 2 can heat the secondary low-temperature water entering the support structure 1, and at the same time, the heat exchange device 2 can turbulently enhance heat exchange of the heat medium inside itself and scrape off the scale layer formed on its inner wall; the input end of the descaling device 3 is located at the input end of the heat exchange device 2, and the two movable output ends of the descaling device 3 are both sleeved on the outer wall of the other end of the heat exchange device 2. The descaling device 3 can cooperate with the heat exchange device 2, and while the heat exchange device 2 is operating, the two movable output ends of the descaling device 3 can respectively scrape off the deposited scale layer generated in the upper and lower areas of the outer wall of the heat exchange device 2 in zones and with different intensities.

[0023] Through the coordinated operation of the support structure 1, heat exchange device 2, and descaling device 3, continuous heating of secondary low-temperature water is achieved simultaneously within a single device. The core functions of heat exchange device 2, including enhanced heat exchange inside the tube and online removal of scale on the inner wall, as well as differentiated scraping of scale on the outer wall of heat exchange device 2, enable the entire process of online cleaning of the heat exchange surface without stopping the machine. This solves the industry pain points of traditional heating heat exchange equipment, such as rapid decline in heat exchange efficiency, incomplete scale removal, and inability to operate continuously, and significantly improves the stability, continuity, and heat exchange efficiency of heating heat exchange operations.

[0024] As a preferred option, further, such as Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the heat exchange device 2 includes a drive assembly 21, a heat exchange tube 22, and a turbulence-removing and descaling assembly 23. The drive assembly 21 is disposed on the outer wall of the support structure 1, and the output end of the drive assembly 21 is rotatable. One end of the heat exchange tube 22 is sleeved on the rotating end of the drive assembly 21, and one end of the heat exchange tube 22 is embedded in the outer wall of the support structure 1, while the other end of the heat exchange tube 22 extends into the support structure 1. The heat exchange tube 22 is connected to the external primary heat medium circulation system. The turbulence-removing and descaling assembly 23 is disposed on the rotating end of the drive assembly 21. The drive assembly 21 can drive the turbulence-removing and descaling assembly 23 to turbulently enhance the heat exchange of the heat medium inside the heat exchange tube 22, and scrape off the scale layer formed on the inner wall of the heat exchange tube 22 through the turbulence-removing and descaling assembly 23.

[0025] Through the coordinated operation of the drive component 21, heat exchange tube 22, and turbulence-removal component 23 of the heat exchange device 2, under the action of a single drive source, the three core functions of circulating heat exchange of the heat medium inside the heat exchange tube 22, forced turbulence-enhanced heat exchange of the heat medium, and real-time online scraping of scale layer on the inner wall of the heat exchange tube 22 are simultaneously realized. There is no need to configure an additional independent turbulence-removal drive mechanism. At the same time, it effectively solves the industry pain points of low heat exchange efficiency caused by laminar flow of heat medium inside traditional heat exchange tube 22 and rapid decay of heat exchange performance caused by scale on the inner wall. It ensures the stable heat exchange efficiency of the heat exchange device 2 throughout the entire operation cycle and improves the heat supply quality and operation continuity of the heat exchange.

[0026] As a preferred option, further, such as Figure 8 , Figure 9 and Figure 10 As shown, the descaling device 3 includes a driven bevel gear transmission assembly 31, a torque amplifying assembly 32, and a scraping assembly 33. There are two sets of driven bevel gear transmission assemblies 31, symmetrically arranged on the outer wall of the support structure 1. The input ends of both sets of driven bevel gear transmission assemblies 31 are linked to the output ends of the drive assembly 21, thus enabling the drive assembly 21 to drive the output ends of both sets of driven bevel gear transmission assemblies 31 to rotate. The torque amplifying assembly 32 is located on the outer wall of the support structure 1, and its input end is connected to the output end of one set of driven bevel gear transmission assemblies 31. The scraping components 33 are fixed in place; there are two sets of scraping components 33, which are symmetrically arranged at the output end of the torque amplification component 32 and the output end of the other set of driven bevel gear transmission component 31, respectively. The moving output ends of the two sets of scraping components 33 are respectively sleeved on the upper and lower areas of the outer wall of the other end of the heat exchange tube 22. One set of scraping components 33 connected to the output end of the torque amplification component 32 can perform force-enhanced scraping of the thick and strongly adhered scale deposits in the lower area of ​​the outer wall of the heat exchange tube 22, while the other set of scraping components 33 performs conventional scraping of the thin and weakly adhered scale deposits in the upper area of ​​the outer wall of the heat exchange tube 22.

[0027] Through the coordinated operation of the driven bevel gear transmission assembly 31, torque amplification assembly 32, and scraping assembly 33 of the descaling device 3, and relying on the linkage with the drive assembly 21, dual-path synchronous operation driven by a single power source is achieved. Online cleaning can be completed synchronously throughout the heat exchange process without the need for an additional independent drive mechanism. The torque amplification assembly 32 enables differentiated and precise adjustment of the two scraping power sources, allowing the two sets of scraping assemblies 33 to perform adaptive scraping for the different scaling characteristics of the upper and lower areas of the outer wall of the heat exchange tube 22. This solves the industry pain points of incomplete cleaning of the thick scale layer on the lower area of ​​the outer wall of the heat exchange tube 22 in traditional heating and heat exchange equipment, and high redundant energy consumption of conventional scraping in the upper area. It also avoids the defect of damage to the anti-corrosion layer of the heat exchange tube 22 wall caused by scraping with a single force. At the same time, it achieves uninterrupted synchronous operation of cleaning and heat exchange operations without the need for manual cleaning during shutdown, which greatly improves the continuity, stability, and heat exchange efficiency of heating and heat exchange operations.

[0028] As a preferred option, further, such as Figure 2 and Figure 3 As shown, the support structure 1 includes a quadruped 11, a support L-plate 12, a heat exchange chamber shell 13, a sealing ring 16, and a scale interception filter 17; the quadruped 11 is used to support the connecting parts at the top; the support L-plate 12 is disposed on one side of the outer wall of the quadruped 11; the heat exchange chamber shell 13 is disposed at the top of the quadruped 11, and two sets of driven bevel gear transmission assemblies 31 are symmetrically disposed on the outer wall of the heat exchange chamber shell 13; a through placement groove 14 is opened on one side of the outer wall of the heat exchange chamber shell 13, and the heat exchange tube 22... One end of the heat exchange chamber shell 13 is fitted into the placement groove 14. Two symmetrical circular grooves 15 are opened on the other side of the outer wall of the heat exchange chamber shell 13. The placement groove 14 and the two circular grooves 15 are connected to the inner cavity of the heat exchange chamber shell 13. There are two sealing rings 16, which are symmetrically fitted into the two circular grooves 15 respectively. The scale interception filter 17 is fitted into the bottom end of the inner wall of the heat exchange chamber shell 13. The scale interception filter 17 has a certain distance from the bottom surface of the inner wall of the heat exchange chamber shell 13. It is used to store the secondary water after heat exchange and intercept the scale scraped off.

[0029] The integrated and coordinated operation of the four-legged bracket 11, support L-plate 12, heat exchange chamber shell 13, placement groove 14, circular groove 15, sealing ring 16, and scale interception filter 17 of the supporting structure 1 provides a unified and stable installation bearing foundation and precise operation positioning benchmark for all functional components of the entire set of equipment. The sealed inner cavity formed by the heat exchange chamber shell 13 ensures the sealing and safety of the heating and heat exchange operation. The standardized openings of the placement groove 14 and circular groove 15 enable precise matching and assembly of each functional component. The dynamic sealing design of the sealing ring 16 completely avoids the risk of leakage of the heating medium. At the same time, the layout of the scale interception filter 17 achieves efficient solid-liquid separation of the heating water and scale, which not only ensures the quality of the water output, but also provides a stable storage cavity for the heated secondary water. This greatly improves the stability, safety, and ease of assembly of the entire set of equipment, and fully meets the usage requirements of large-scale continuous operation of the heating system.

[0030] As a preferred option, further, such as Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, the drive assembly 21 includes a flat brake motor 211, a drive bevel gear 212, a support rotating rod 213, and a sealed rotating shaft 214. The flat brake motor 211 is disposed within the wall of the support L plate 12. One end of the drive bevel gear 212 is disposed at the output end of the flat brake motor 211. One end of the support rotating rod 213 is disposed at the other end of the drive bevel gear 212. The inner ring of the sealed rotating shaft 214 is sleeved on the outer wall of the support rotating rod 213, and the outer ring of the sealed rotating shaft 214 is sleeved on one end of the heat exchange tube 22. The flat brake motor 211 can drive the support rotating rod 213 to rotate.

[0031] Through the coaxial cooperation of the flat brake motor 211, the active bevel gear 212, the supporting rotating rod 213 and the sealed rotating shaft 214 of the drive component 21, a stable and precise single power source rotation output is provided for the entire equipment. At the same time, relying on the design of the sealed rotating shaft 214, the dual core requirements of rotational transmission and dynamic sealing at the end of the heat exchange tube 22 are solved simultaneously. This ensures both the coaxiality and operational stability of power transmission, and eliminates the safety risks of heat medium leakage in the heat exchange tube 22 and secondary water leakage from the working chamber.

[0032] As a preferred option, further, such as Figure 5 , Figure 6 and Figure 7 As shown, the turbulence descaling assembly 23 includes a sun gear 231, fixed blocks 232, a triangular rotating seat 233, planetary gears 234, a first gear 235, and a second gear 236. The sun gear 231 is sleeved on the outer wall of the supporting rotating rod 213. There are two fixed blocks 232, one end of which is symmetrically arranged on the outer wall of the sun gear 231, and the other ends of the two fixed blocks 232 are fixedly connected to the inner wall of the heat exchange tube 22. The triangular rotating seat 233 is arranged at the other end of the supporting rotating rod 213. There are three planetary gears 234, one end of which is respectively arranged at the three ends near the triangular rotating seat 233 through three first bearings. All three gears 234 mesh with the sun gear 231. The rotation of the supporting rotating rod 213 drives the triangular rotating seat 233 to rotate, and drives the three planetary gears 234 to rotate along the circumferential teeth of the sun gear 231. There are three first gears 235, which are respectively set at one end of the three planetary gears 234. The three planetary gears 234 can drive the three first gears 235 to rotate. There are three second gears 236, which are respectively set at one end of the three ends of the triangular rotating seat 233 through three second bearings. The three second gears 236 mesh with the three first gears 235, and the three first gears 235 can drive the three second gears 236 to rotate.

[0033] Through the coordinated meshing and transmission of the sun gear 231, fixed block 232, triangular rotating seat 233, planetary gear 234, first gear 235, and second gear 236 of the turbulence descaling component 23, the fixed block 232 ensures stable positioning of the sun gear 231 and the heat exchange tube 22. Driven coaxially by the supporting rotating rod 213, a composite rotational action output combining revolution and rotation is achieved using a planetary gear system. Simultaneously, the meshing transmission of the first gear 235 and second gear 236 completes secondary speed and torque adjustment. The overall transmission structure exhibits high coaxiality and strong transmission stability. It can output multi-point synchronous composite rotational actions within the heat exchange tube 22 without the need for an additional independent power source, ensuring the synchronicity and reliability of the transmission process. This provides a stable and precise action output basis for the turbulence of the heat medium and the descaling of the inner wall within the heat exchange tube 22, fully meeting the requirements for long-term continuous operation of heating and heat exchange equipment.

[0034] As a preferred option, further, such as Figure 6 and Figure 7 As shown, the turbulence descaling assembly 23 also includes extension blocks 237 and cross scrapers 238; there are three extension blocks 237, one end of which is respectively set at the other end of the second gear 236; there are three cross scrapers 238, which are respectively set at the other end of the extension blocks 237. Through the cooperation of the sun gear 231 with the three planetary gears 234, the three cross scrapers 238 can be driven to contact the inner wall of the heat exchange tube 22, thereby turbulence-enhanced heat exchange of the heat medium inside the heat exchange tube 22 and scraping off the scale layer formed on the inner wall of the heat exchange tube 22.

[0035] Through the adaptation and cooperation of the extension block 237 of the turbulence descaling component 23 and the cross scraper 238, and relying on the compound rotational transmission of the second gear 236, the cross scraper 238 achieves a full-circumferential, dead-angle-free compound rotation operation in the inner cavity of the heat exchange tube 22 under the meshing drive of the sun gear 231 and the planetary gear 234. This simultaneously completes the dual core functions of forced turbulence of the heat medium and real-time scraping of the scale layer on the inner wall. The turbulence of the cross scraper 238 breaks the laminar flow of the heat medium in the heat exchange tube 22. The system eliminates the temperature gradient inside the tube and enhances heat exchange efficiency. Furthermore, the cross scraper 238 continuously scrapes against the inner wall of the heat exchange tube 22, removing the scale layer on the inner wall in real time. This avoids the problem of increased thermal resistance and decreased heat exchange efficiency caused by thickened scale. At the same time, the adaptation design of the extension block 237 ensures the installation positioning accuracy and scraping fit of the cross scraper 238, greatly improving the heat exchange stability and operation continuity of the heat exchange tube 22. Online descaling of the inner wall of the tube can be completed without stopping the machine.

[0036] As a preferred option, further, such as Figure 8 and Figure 9As shown, the torque amplification component 32 includes a support plate 321, a drive gear 322, a first transmission rod 323, a second transmission rod 324, and a driven gear 325. One end of the support plate 321 is disposed on the outer wall of the heat exchange chamber shell 13. One end of the drive gear 322 is disposed on the other end of the support plate 321 through a third bearing, and the other end of the drive gear 322 is connected and fixed to the output end of a set of driven bevel gear transmission components 31. The first transmission rod 323 is sleeved on the outer wall of the drive gear 322. The second transmission rod 324 is sleeved on the other end near the support plate 321 through a fourth bearing. The driven gear 325 is disposed on one end of the second transmission rod 324. The drive gear 322 and the driven gear 325 contact and mesh, and the drive gear 322 and the driven gear 325 increase the rotational output torque of the second transmission rod 324 through the mechanical principle of a small gear driving a large gear.

[0037] Through the coordinated meshing and transmission of the bearing plate 321, driving gear 322, first transmission rod 323, second transmission rod 324, and driven gear 325 of the torque amplification component 32, the entire transmission mechanism is stably installed and precisely parallel positioned on the outer wall of the heat exchange chamber shell 13 by relying on the bearing plate 321. Through the reduction and torque amplification transmission structure of the small gear of the driving gear 322 and the driven gear 325 driving the large gear, the torque amplification output of the input power of the driven bevel gear transmission component 31 is accurately realized without adding an additional power source, which greatly improves the torque adjustment flexibility and transmission reliability of the power output.

[0038] As a preferred option, further, such as Figure 8 , Figure 9 and Figure 10 As shown, the scraping assembly 33 includes a first connecting rod 331, a second connecting rod 332, a circular connecting rod 333, and an arc-shaped scraper 334. One end of the first connecting rod 331 is disposed at the other end of the second transmission rod 324. One end of the second connecting rod 332 is disposed at the other end of the first connecting rod 331 via a fifth bearing. One end of the circular connecting rod 333 is disposed at the other end of the second connecting rod 332 via a sixth bearing, and the other end of the circular connecting rod 333 is movably embedded in a sealing ring 16. The arc-shaped scraper 334 is disposed at the other end of the circular connecting rod 333. Contacting the lower region of the outer wall of the heat exchange tube 22, the second transmission rod 324 drives the first connecting rod 331 to rotate, which in turn drives the second connecting rod 332 to move the round connecting rod 333 along the inner wall of the sealing ring 16. This increases the output torque of the round connecting rod 333 through the torque amplification component 32, thereby increasing the force to scrape off the thick and strongly adhered scale deposits in the lower region of the outer wall of the heat exchange tube 22. Similarly, the scraping component 33 driven by another set of driven bevel gear transmission components 31 performs conventional scraping of the thin and weakly adhered scale deposits on the upper region of the outer wall of the heat exchange tube 22.

[0039] Through the crank-connecting rod transmission of the first connecting rod 331, the second connecting rod 332, the round connecting rod 333 of the scraping component 33 and the arc-shaped scraper 334, the rotational power is converted into a stable linear reciprocating scraping action. With the help of the sealing ring 16, the limiting and sealing are achieved. Under the differentiated torque drive of the torque increasing component 32 and the driven bevel gear transmission component 31, the arc-shaped scraper 334 can achieve zoned and adaptive scraping of the scale layer in the upper and lower areas of the outer wall of the heat exchange tube 22. This ensures that the thick scale layer in the lower area is thoroughly cleaned, while avoiding excessive scraping force in the upper area that could damage the anti-corrosion layer of the heat exchange tube 22. This enables continuous online cleaning and improves heat exchange stability and production continuity.

[0040] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, and the specific work is as follows: After the secondary low-temperature water transported through the external pipeline enters the sealed heat exchange working chamber of the heat exchange chamber shell 13, it forms a sufficient contact heat exchange environment with the heat exchange tubes 22 arranged in the chamber. The heat exchange tubes 22 form a closed-loop circulation path with the external primary heat medium circulation system. The high-temperature primary heat medium flows continuously in the tubes. The heat medium generates forced convection heat exchange with the secondary low-temperature water in the chamber through the tube wall, quickly transferring heat to the secondary water, so that the secondary low-temperature water can quickly rise to the set heating temperature and complete the heating heat exchange process.

[0041] The heated secondary water is collected at the bottom of the heat exchange chamber shell 13 under the action of gravity. After being filtered by the scale interception filter screen 17, it is sent out from the outlet and enters the secondary heating network to complete the core heating heat exchange process.

[0042] The rotational power output by the flat brake motor 211 is transmitted to the supporting rotating rod 213, causing the supporting rotating rod 213 to rotate around a fixed axis. The sun gear 231 fixedly mounted on the supporting rotating rod 213 rotates synchronously with the shaft, and the triangular rotating seat 233 at the end of the supporting rotating rod 213 revolves synchronously with the shaft, thereby driving the three sets of planetary gears 234 mounted on the triangular rotating seat 233 to perform meshing rolling motion along the circumferential tooth surface of the sun gear 231. While the planetary gears 234 complete their revolution with the triangular rotating seat 233, they generate high-speed rotational motion through meshing with the fixed sun gear 231. This rotational motion is transmitted a second time through the coaxially mounted first gear 235 and the meshing second gear 236, further driving the cross scraper 238 connected to the end of the second gear 236 via the extension block 237 to perform a compound rotational motion of revolution and rotation.

[0043] During the combined motion of the cross-shaped scraper 238, two core functions are achieved simultaneously: Forced homogenization and turbulence of heat medium: The rotating structure of the cross scraper 238 continuously forces turbulence on the heat medium in the heat exchange tube 22, breaking the laminar flow state of the heat medium in the tube, eliminating the radial and axial temperature gradients of the heat medium in the tube, making the overall temperature of the heat medium in the tube uniform, avoiding the decrease in heat exchange efficiency caused by the local heat medium temperature dropping too quickly, greatly enhancing the heat transfer coefficient between the heat medium and the tube wall of the heat exchange tube 22, and ensuring stable heating heat exchange efficiency.

[0044] Real-time scraping of scale on the inner wall: The outer edge of the cross scraper 238 always keeps in close contact with the inner wall of the heat exchange tube 22. Through compound rotational motion, it performs continuous scraping of the inner wall of the heat exchange tube 22 in all directions without dead angles. The scale layer formed on the inner wall due to the precipitation of minerals in the heat medium during the heat exchange process is scraped off in real time. This avoids the problem of increased thermal resistance of the tube wall caused by the continuous thickening of the scale layer, and ensures that the heat exchange performance of the heat exchange tube 22 remains stable throughout the entire operation cycle.

[0045] Differentiated scaling process for the outer wall of heat exchange tubes: The rotational power output by the flat brake motor 211 is synchronously split into two independent rotational power outputs through the meshing transmission of the active bevel gear 212 and two sets of driven bevel gear transmission components 31. One power is directly transmitted to the first set of scraping components 33, and the other power is first amplified by the torque amplification component 32 before being transmitted to the second set of scraping components 33.

[0046] Both sets of scraping components 33 employ a crank-connecting rod transmission mechanism, converting the input continuous rotary motion into linear reciprocating motion. This, in turn, drives the arc-shaped scraper 334 at the end to perform a stable reciprocating scraping motion along the outer wall of the heat exchange tube 22, achieving continuous removal of scale from the outer wall of the heat exchange tube 22. Considering the scaling characteristics of different areas on the outer wall of the heat exchange tube 22, the equipment adopts a zoned differentiated scraping design. The specific working process is as follows: Regular scraping operation in the upper area: The transmission link without torque amplification directly drives the corresponding scraping component 33 to reciprocate, and uses regular scraping force to reciprocate to scrape the scale layer on the outer wall of the heat exchange tube 22. Because the secondary water flow rate is uniform in this area, the scale layer is not easy to deposit, the scale amount is small, the scale layer thickness is thin, and the adhesion strength is low. Regular scraping force can completely remove the scale layer, while reducing the energy consumption of equipment operation.

[0047] Lower area enhanced scraping operation: When the other power is processed by the torque amplification component 32, the meshing transmission of the driving gear 322 and driven gear 325 arranged on the bearing plate 321 is based on the mechanical transmission torque amplification principle of the small gear driving the large gear. While reducing the output speed, the rotational output torque of the second transmission rod 324 is significantly increased, thereby enabling the corresponding scraping component 33 to obtain a greater linear reciprocating driving force. The enhanced scraping force is used to reciprocate to scrape the scale layer in the lower area of ​​the outer wall of the heat exchange tube 22. This area is the main area for gravity deposition of impurities in secondary water. The scale formation is large, the scale layer is thick, and the adhesion strength is high. The increased scraping force can effectively remove thick and high-strength scale layers, completely avoiding the heat exchange efficiency reduction caused by scale adhesion.

[0048] During the scraping operation, the circular connecting rod 333 of the scraping component 33 achieves limiting guidance and dynamic sealing through the sealing ring 16 in the circular groove 15 of the heat exchange chamber shell 13, ensuring the stability of the reciprocating motion and the airtightness of the chamber. The scraping operation and the heating and heat exchange operation are carried out synchronously. When the scraped scale falls with the secondary water, it is separated into solid and liquid by the scale interception filter 17 at the bottom of the heat exchange chamber shell 13. The scale is intercepted on the surface of the filter screen, preventing it from mixing into the heated secondary water and ensuring the quality of the effluent. A drain port is provided at the bottom of the chamber, which can periodically discharge the intercepted scale online without stopping the machine for cleaning.

[0049] 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 zoned differentiated descaling enhanced heat exchange device for heating, characterized in that, include: Support structure (1) is set in the area where the external primary heat medium network and secondary heating network are laid out; The heat exchange device (2) is embedded in the outer wall of the support structure (1) at one end and extends into the support structure (1) at the other end. The heat exchange device (2) can heat the secondary low-temperature water entering the support structure (1) and at the same time, the heat exchange device (2) can turbulently enhance the heat exchange of the heat medium inside itself and scrape off the scale layer formed on its inner wall. The descaling device (3) has its input end located at the input end of the heat exchange device (2). The two movable output ends of the descaling device (3) are both sleeved on the outer wall of the other end of the heat exchange device (2). The descaling device (3) can cooperate with the heat exchange device (2). While the heat exchange device (2) is operating, the two movable output ends of the descaling device (3) can respectively divide the deposited scale layer generated in the upper and lower areas of the outer wall of the heat exchange device (2) and scrape it with different intensities. The heat exchange device (2) includes: A drive assembly (21) is disposed on the outer wall of the support structure (1), and the output end of the drive assembly (21) is rotatable; The heat exchange tube (22) is fitted at one end to the rotating end of the drive assembly (21), and one end of the heat exchange tube (22) is embedded in the outer wall of the support structure (1), and the other end of the heat exchange tube (22) extends into the support structure (1). The heat exchange tube (22) is connected to the external primary heat medium circulation system. The turbulence descaling component (23) is disposed at the rotating end of the drive component (21). The drive component (21) can drive the turbulence descaling component (23) to turbulently enhance the heat exchange of the heat medium inside the heat exchange tube (22) and scrape off the scale layer formed on the inner wall of the heat exchange tube (22) through the turbulence descaling component (23).

2. The enhanced heat exchange equipment for heating with zoned differentiated descaling as described in claim 1, characterized in that, The descaling device (3) includes: There are two sets of driven bevel gear transmission assemblies (31), which are symmetrically arranged on the outer wall of the support structure (1). The input ends of the two sets of driven bevel gear transmission assemblies (31) are linked to the output end of the drive assembly (21), so that the drive assembly (21) can drive the output ends of the two sets of driven bevel gear transmission assemblies (31) to rotate. A torque amplification component (32) is disposed on the outer wall of the support structure (1), and the input end of the torque amplification component (32) is connected and fixed to the output end of a set of driven bevel gear transmission components (31); There are two sets of scraping components (33), which are symmetrically arranged at the output end of the torque increasing component (32) and the output end of another set of driven bevel gear transmission components (31). The moving output ends of the two sets of scraping components (33) are respectively sleeved on the upper and lower areas of the outer wall of the other end of the heat exchange tube (22). One set of scraping components (33) connected to the output end of the torque increasing component (32) can perform force-enhanced scraping of the thick and strongly adhered scale deposits in the lower area of ​​the outer wall of the heat exchange tube (22), while the other set of scraping components (33) performs conventional scraping of the thin and weakly adhered scale deposits in the upper area of ​​the outer wall of the heat exchange tube (22).

3. The enhanced heat exchange equipment for heating with zoned differentiated descaling as described in claim 2, characterized in that, The supporting structure (1) includes: A quadrupole (11) is used to support the connecting parts at the top. A support plate (12) is provided on one side of the outer wall of the quadrupole (11); The heat exchange chamber shell (13) is located at the top of the four-legged bracket (11), and the two sets of driven bevel gear transmission assemblies (31) are symmetrically arranged on the outer wall of the heat exchange chamber shell (13); A through placement groove (14) is provided on one side of the outer wall of the heat exchange chamber shell (13), and one end of the heat exchange tube (22) is fitted into the placement groove (14). Two symmetrical circular grooves (15) are provided on the other side of the outer wall of the heat exchange chamber shell (13). The placement groove (14) and the two circular grooves (15) are all connected to the inner cavity of the heat exchange chamber shell (13). Two sealing rings (16) are symmetrically fitted into the two circular grooves (15); The scale interception filter (17) is sleeved on the bottom of the inner wall of the heat exchange chamber shell (13). The scale interception filter (17) has a certain distance from the bottom of the inner wall of the heat exchange chamber shell (13) and is used to store the secondary water after heat exchange and intercept the scale scraped off.

4. The enhanced heat exchange equipment for heating with zoned differentiated descaling as described in claim 3, characterized in that, The driving component (21) includes: A flat brake motor (211) is disposed within the wall of the support L plate (12); One end of the active bevel gear (212) is located at the output end of the flat brake motor (211); A support rotating rod (213) is provided at one end of the other end of the driving bevel gear (212); The inner ring of the sealed rotating shaft (214) is sleeved on the outer wall of the supporting rotating rod (213), and the outer ring of the sealed rotating shaft (214) is sleeved on one end of the heat exchange tube (22). The flat brake motor (211) can drive the supporting rotating rod (213) to rotate.

5. The enhanced heat exchange equipment for heating with zoned differentiated descaling as described in claim 4, characterized in that, The turbulence descaling component (23) includes: The sun gear (231) is sleeved on the outer wall of the supporting rotating rod (213); There are two fixing blocks (232), one end of which is symmetrically arranged on the outer wall of the sun gear (231), and the other end of the two fixing blocks (232) is fixedly connected to the inner wall of the heat exchange tube (22); A triangular rotating seat (233) is disposed at the other end of the supporting rotating rod (213); There are three planetary gears (234), one end of which is respectively set at the three ends near the triangular rotating seat (233) through three first bearings. All three planetary gears (234) are meshed with the sun gear (231). The rotation of the support rotating rod (213) drives the triangular rotating seat (233) to rotate, and drives the three planetary gears (234) to rotate along the circumferential teeth of the sun gear (231). There are three first gears (235), which are respectively set at one end of the three planetary gears (234). The three planetary gears (234) can drive the three first gears (235) to rotate. There are three second gears (236), one end of which is respectively set at the three ends of the triangular rotating seat (233) through three second bearings. The three second gears (236) mesh with the three first gears (235) respectively, and the three first gears (235) can drive the three second gears (236) to rotate.

6. The enhanced heat exchange equipment for heating with zoned differentiated descaling as described in claim 5, characterized in that, The turbulence descaling component (23) also includes: There are three extension blocks (237), one end of which is respectively set at the other end of the second gear (236); Three cross scrapers (238) are respectively set at the other end of the extension block (237). Through the cooperation of the sun gear (231) with the three planetary gears (234), the three cross scrapers (238) can be driven to contact the inner wall of the heat exchange tube (22) to turbulently enhance heat exchange of the heat medium inside the heat exchange tube (22) and scrape off the scale layer formed on the inner wall of the heat exchange tube (22).

7. The enhanced heat exchange equipment for heating with zoned differentiated descaling as described in claim 6, characterized in that, The torque amplification component (32) includes: The support plate (321) is disposed at one end on the outer wall of the heat exchange chamber shell (13); One end of the driving gear (322) is mounted on the other end of the bearing plate (321) via a third bearing, and the other end of the driving gear (322) is connected and fixed to the output end of a set of driven bevel gear transmission components (31); The first transmission rod (323) is sleeved on the outer wall of the drive gear (322); The second transmission rod (324) is sleeved on the other end near the bearing plate (321) via a fourth bearing; The driven gear (325) is located at one end of the second transmission rod (324).

8. The enhanced heat exchange equipment for heating with zoned differentiated descaling as described in claim 7, characterized in that, The driving gear (322) contacts and meshes with the driven gear (325). The driving gear (322) and the driven gear (325) increase the rotational output torque of the second transmission rod (324) through the mechanical principle of the small gear driving the large gear.

9. A zone-differentiated descaling enhanced heat exchange device for heating according to claim 8, characterized in that, The scraping assembly (33) includes: The first connecting rod (331) is located at one end of the other end of the second transmission rod (324); The second link (332) is mounted at one end to the other end of the first link (331) via a fifth bearing; A circular connecting rod (333) is mounted at one end to the other end of the second connecting rod (332) via a sixth bearing, and the other end of the circular connecting rod (333) is movably embedded in a sealing ring (16); An arc-shaped scraper (334) is disposed at the other end of the circular connecting rod (333). The arc-shaped scraper (334) contacts the lower area of ​​the outer wall of the heat exchange tube (22). The second transmission rod (324) drives the first connecting rod (331) to rotate, thereby driving the second connecting rod (332) to drive the circular connecting rod (333) to move along the inner wall of the sealing ring (16) to limit movement. This increases the output torque of the circular connecting rod (333) through the torque increasing component (32), thereby increasing the force to scrape off the thick and strongly adhered scale deposits in the lower area of ​​the outer wall of the heat exchange tube (22). Similarly, the scraping component (33) driven by another set of driven bevel gear transmission components (31) performs conventional scraping of the thin and weakly adhered scale deposits on the outer wall of the heat exchange tube (22).

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