Double-tube-plate heat exchanger

Abstract

The invention relates to a double-tube-plate heat exchanger which comprises a bottom frame and a shell fixedly arranged on the bottom frame, two tube plates are arranged in the shell, a plurality of heat exchange tubes are arranged between the two tube plates, and a tube pass fluid inlet, a tube pass fluid outlet, a shell pass fluid inlet and a shell pass fluid outlet are formed in the shell. A multifunctional sliding piece is arranged between the two tube plates in the shell, a sliding piece driving device is arranged outside the shell, a first sealing device is arranged between the shell and the tube plates, and a second sealing device is arranged between the tube plates and the heat exchange tubes. By arranging the multifunctional sliding sheets and the sliding sheet driving device, the outer walls of the heat exchange tubes can be cleaned on the premise that the tube plates are not detached, it is guaranteed that the interior of the heat exchanger is clean and free of impurities, when the heat exchange tubes are damaged, it can be accurately determined that one or more heat exchange tubes are damaged at a time, the damaged heat exchange tubes can be directly detached and replaced conveniently, and the heat exchange efficiency is improved. And the maintenance difficulty is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to a double-tube sheet heat exchanger. Background Art

[0002] The double tube sheet heat exchanger is mainly composed of core components such as the shell, tube sheet, sealing gasket, heat exchange tube bundle, etc. The shell is usually made of high-quality metal materials, with excellent strength and corrosion resistance, and can withstand various harsh working environments. The tube sheet is located inside the shell, dividing it into two adjacent fluid channels. There are many parallel pipes on each tube sheet for the circulation of hot and cold carriers.

[0003] The working principle of the double tube sheet heat exchanger is based on the basic principles of heat conduction and convection heat transfer. When two fluids of different temperatures flow through the two sides of the heat exchanger, heat is transferred from the high-temperature fluid to the low-temperature fluid through the heat exchange tube wall, thereby achieving heat transfer and balance. In the double tube sheet heat exchanger, due to the use of a double tube sheet design, the fluid can form multiple loops when flowing through the heat exchange tube, increasing the contact area between the fluid and the heat exchange tube wall, thereby improving the heat transfer efficiency. At the same time, the double tube sheet design can also effectively prevent the occurrence of leakage problems and improve the safety and reliability of the heat exchanger.

[0004] In addition, double tube sheet heat exchangers also have the need for fault diagnosis and maintenance. During use, they may fail due to improper operation, equipment aging, environmental corrosion, etc., causing impurities to deposit on the inner and outer walls of the heat exchange tubes, which are difficult to clean and affect their normal operation. Therefore, regular inspection and maintenance are the key to ensuring their long-term stable operation.

[0005] Therefore, in the use of double tube sheet heat exchangers, the most common technical problems are the following three points; 1. It is difficult to clean the impurities deposited on the outer wall of the heat exchange tube without disassembling the tube sheet after use.

[0006] 2. Technical problems such as inconvenience in repairing and difficulty in replacing heat exchange tubes after they are damaged.

[0007] 3. Liquid leakage due to poor sealing during use. Summary of the invention

[0008] The present invention provides a double tube sheet heat exchanger to solve the following three technical problems that are relatively concentrated and difficult to solve in existing heat exchangers: 1. It is difficult to clean the impurities deposited on the outer wall of the heat exchange tube without disassembling the tube sheet after use.

[0009] 2. After the heat exchange tube is damaged, it is difficult to accurately determine whether one or several heat exchange tubes are damaged.

[0010] 3. Liquid leakage due to poor sealing during use.

[0011] The present invention discloses a double tube sheet heat exchanger, comprising a base frame and a shell fixed on the base frame, wherein two tube sheets are arranged in the shell, a plurality of heat exchange tubes are arranged between the two tube sheets, a tube side fluid inlet, a tube side fluid outlet, a shell side fluid inlet and a shell side fluid outlet are respectively arranged on the shell, a multifunctional sliding vane is arranged between the two tube sheets in the shell, a sliding vane driving device is arranged outside the shell, a first sealing device is arranged between the shell and the tube sheet, and a second sealing device is arranged between the tube sheet and the heat exchange tube.

[0012] Through the above technical solution, after the heat exchanger has been used for a period of time, if there are many impurities in the shell, the outer wall of the heat exchange tube can be cleaned without disassembling the tube sheet through the multifunctional slide and the slide drive device, thereby ensuring that the inside of the heat exchanger is clean and free of impurities. The hollow setting of the multifunctional slide cooperates with the fan to accurately determine the damaged heat exchange tube when a certain heat exchange tube is damaged, which is convenient for directly disassembling and replacing the damaged heat exchange tube, greatly reducing the difficulty of maintenance. The first sealing device and the second sealing device can prevent leakage.

[0013] Furthermore, the multifunctional sliding plate includes a hollow sheet body, a plurality of wheel frames are arranged on the periphery of the hollow sheet body, a roller is rotatably connected to the wheel frame, the roller abuts against the inner wall of the shell, and the hollow sheet body is provided with clearance holes corresponding to the positions of the heat exchange tubes, the inner diameter of the clearance holes is slightly larger than the outer diameter of the heat exchange tubes, a plurality of air outlet pipes are arranged in the clearance holes, and the plurality of air outlet pipes are connected to the interior of the hollow sheet body, a sliding plate is arranged on the lower side of the hollow sheet body, an air inlet hole is arranged on the sliding plate, a sealing cover is detachably arranged in the air inlet hole, a fan is detachably arranged on the sliding plate, an inner magnetic groove is arranged on one side of the hollow sheet body, and an inner magnetic block is arranged in the inner magnetic groove.

[0014] Through the above technical solution, when in use, the slide drive device drives the multifunctional slide to move along the axis direction of the shell, and the gas enters the air inlet from the fan (it should be noted that when the heat exchanger is in normal use, the air outlet is connected to the cover. When maintenance or cleaning is required, the multifunctional slide can be moved to the shell-side fluid inlet, and the filter device at the shell-side fluid inlet can be manually removed, so as to install the fan through the shell-side fluid inlet). After filling the hollow sheet body, it is blown from several air outlets to the heat exchange tube. It needs to be used in conjunction with the cleaning sheet. If the heat exchange tube is damaged and there are cracks or holes, the gas will be blown into the heat exchange tube and flow out from both sides of the heat exchange tube. At this time, one side of the heat exchange tube is blocked and whether there is gas flowing out from the other end can be detected. The damaged heat exchange tube can be accurately judged, thereby realizing the judgment and replacement of the damaged heat exchange tube without disassembling the tube sheet, greatly reducing the difficulty of replacing the heat exchange tube.

[0015] Furthermore, the hollow sheet body is provided with stepped holes on both sides of the plurality of the clearance holes, and a cleaning sheet is detachably connected in the stepped hole, and the inner side of the cleaning sheet is in contact with the outer wall of the heat exchange tube.

[0016] Through the above technical solution, when the heat exchange tube needs to be cleaned or repaired, the multifunctional slide is driven by the slide drive device to move along the axis direction of the shell, and the cleaning sheet can scrape and clean the outer walls of all heat exchange tubes along the heat exchange tube, thereby preventing impurities from being deposited on the heat exchange tube, which may cause damage to the heat exchange tube over time.

[0017] Furthermore, the cleaning sheet comprises a fixing sheet and a conical sheet, the fixing sheet and the conical sheet are connected via an elastic sheet, and an inner ring fixing hole and an outer ring fixing hole are provided on the fixing sheet.

[0018] Through the above technical solution, when the heat exchange tube needs to be cleaned or repaired, the multifunctional slide is driven by the slide drive device to move along the axis direction of the shell, and the conical sheet cooperates with the elastic sheet to first clean the impurities on the outer wall of the heat exchange tube. The conical shape is more conducive to cleaning impurities, and the elastic sheet can ensure that it will not be stuck by large impurities. It is a cleaning step before the cleaning sheet is cleaned. Double cleaning can make the cleaning effect better. The inner ring fixing hole and the outer ring fixing hole can adjust the elasticity of the inner ring part of the fixing sheet.

[0019] Furthermore, a guide bar is provided on the inner side of the shell corresponding to the position of the roller, and the guide bar can limit the linear movement of the roller along the axis direction of the shell, and a reinforcing plate is provided between the hollow sheet body and the wheel frame.

[0020] Through the above technical solution, when the heat exchange tube needs to be cleaned or repaired, the multifunctional slide is driven by the slide drive device to move along the axis direction of the shell, and the guide bar can ensure that the multifunctional slide does not rotate, and the relative position relationship with the shell is guaranteed to be consistent, so that no other pressure will be generated on the heat exchange tube to cause damage to the heat exchange tube. The reinforcement plate can ensure the stability of the structure and further prevent the movement of the multifunctional sheet from causing damage to the heat exchange tube.

[0021] Furthermore, a drain port is provided at the bottom of the sliding plate, and a cover sheet is detachably connected to the drain port.

[0022] Through the above technical solution, when the heat exchanger is in use, the multifunctional slide is also inside the shell and in contact with the liquid in the heat exchanger. The multifunctional slide is hollow inside and is provided with an air outlet, so it is inevitable that liquid will enter. When cleaning or maintenance is required, the multifunctional slide can be moved to the shell-side fluid inlet, and the filter device at the shell-side fluid inlet can be manually removed, so that the worker's arm can be inserted through the shell-side fluid inlet to open the cover to release the residual liquid in the multifunctional slide.

[0023] Furthermore, the slide drive device includes two T-shaped rails arranged on the outside of the shell, a sliding block is slidably connected to the T-shaped rails, an external magnetic groove is provided on the sliding block close to the shell, an external magnetic block is arranged in the external magnetic groove, a servo motor is arranged on the sliding block, the servo motor is connected to a gear, a rack is arranged on the shell, the gear is meshed with the rack, a lifting cylinder is detachably arranged on the side of the sliding block away from the shell, a mounting seat is arranged on the piston rod of the lifting cylinder, a rubber pad can be installed on the mounting seat, and a universal wheel can be installed at the bottom of the rubber pad.

[0024] Through the above technical solution, the multifunctional sliding plate located inside can be driven to move without disassembling the shell and the tube sheet, and the moving position and status of the multifunctional sliding plate can also be observed outside the shell. When the heat exchanger needs to be repaired or moved, the lifting cylinder and the sliding block can be moved to a suitable position by installing a rubber pad or a roller on the mounting seat, so that the heat exchanger can be lifted and repaired, or moved.

[0025] Furthermore, the shell includes an inlet shell, a middle shell and an outlet shell, the tube sheet is fixedly connected to the middle shell, the inlet shell and the outlet shell are both fixedly connected to the middle shell, the first sealing device includes a first N-shaped sealing ring arranged between the inlet shell, the tube sheet and the middle shell, and also includes a second N-shaped sealing ring arranged between the outlet shell, the tube sheet and the middle shell, the first N-shaped sealing ring and the second N-shaped sealing ring are both provided with a plurality of annular grooves, and a sealing ring with a circular cross-section is provided in the annular groove.

[0026] Through the above technical solution, the first and second N-shaped sealing rings can be used to provide a first layer of anti-leakage, and the ring groove and the sealing ring can provide a second layer of sealing. The double protection can ensure that no leakage occurs.

[0027] Furthermore, a protrusion is provided at one end of the heat exchange tube, and a thread is provided at the other end, and the second sealing device comprises a rubber ring provided between the tube sheet and the heat exchange tube, and the cross section of the rubber ring is trapezoidal.

[0028] Through the above technical solution, the connection method between the tube sheet and the heat exchange tube is simple, and the unique compression deformation characteristics of the trapezoidal sealing ring can be used to ensure a tight connection between the tube sheet and the heat exchange tube to prevent leakage.

[0029] Furthermore, filtering devices are provided in the tube-side fluid inlet, the tube-side fluid outlet, the shell-side fluid inlet and the shell-side fluid outlet, and a plurality of lifting ears are provided on the shell.

[0030] The above technical solution can prevent the entry of external fluid into the heat exchanger and the introduction of impurities that may damage the heat exchanger structure, and the provision of the lifting lugs can ensure that the heat exchanger is easy to carry and move.

[0031] The present invention provides the following technical effects: 1. The outer wall of the heat exchange tube can be cleaned without disassembling the tube sheet to ensure that the inside of the heat exchanger is clean and free of impurities. The rest of the cleaning, such as the inner wall of the heat exchange tube, is not difficult and can be carried out in the conventional way.

[0032] 2. The heat exchange tubes can be inspected without disassembling the tube sheet. The hollow structure of the multifunctional slide is matched with the fan. When the heat exchange tube is damaged, it can accurately determine at one time whether one or several heat exchange tubes are damaged, which is convenient for directly disassembling and replacing the damaged heat exchange tubes, greatly reducing the difficulty of maintenance.

[0033] 3. The first sealing device and the second sealing device can enhance the sealing effect and prevent liquid leakage.

[0034] The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] One or more embodiments are exemplarily described by corresponding drawings, and these exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are regarded as similar elements, and wherein: Figure 1 It is a schematic diagram of the overall structure of an embodiment of a double tube sheet heat exchanger of the present invention; Figure 2 It is a cross-sectional schematic diagram of an embodiment of a double tube sheet heat exchanger of the present invention; Figure 3 yes Figure 2 A magnified view of center A; Figure 4 It is a schematic diagram of the interior of a shell in a double tube sheet heat exchanger of the present invention; Figure 5 It is a schematic diagram of the exploded structure of a multifunctional sliding vane and a sliding vane driving device in a double tube sheet heat exchanger of the present invention; Figure 6 It is a schematic diagram of the internal structure of a multifunctional sliding vane in a double tube sheet heat exchanger of the present invention; Figure 7 It is a schematic diagram of the overall structure of a sliding vane driving device in a double tube sheet heat exchanger of the present invention; Figure 8 The present invention is a schematic structural diagram of a cleaning sheet in a double tube sheet heat exchanger.

[0036] Reference numerals: 1. Base frame; 2. Shell; 3. Tube sheet; 4. Heat exchange tube; 5. Tube side fluid inlet; 6. Tube side fluid outlet; 7. Shell side fluid inlet; 8. Shell side fluid outlet; 9. Multifunctional slide; 10. Slide drive device; 11. First sealing device; 12. Second sealing device; 13. Hollow sheet; 14. Wheel frame; 15. Roller; 16. Clearance hole; 17. Air outlet pipe; 18. Sliding plate; 19. Air inlet; 20. Cover; 21. Fan; 22. Inner magnetic groove; 23. Inner magnetic block; 24. Cleaning sheet; 25. Solid Stator; 26. Conical plate; 27. Elastic plate; 28. Guide strip; 29. ​​Reinforcement plate; 30. Drain port; 31. Cover plate; 32. T-shaped track; 33. Sliding block; 34. External magnetic groove; 35. External magnetic block; 36. Servo motor; 37. Gear; 38. Rack; 39. Inlet shell; 40. Middle shell; 41. Outlet shell; 42. First N-shaped sealing ring; 43. Second N-shaped sealing ring; 44. Sealing ring; 45. Rubber ring; 46. Filter device; 47. Lifting ear; 48 Lifting cylinder; 49. Mounting seat. DETAILED DESCRIPTION

[0037] In order to be able to understand the features and technical contents of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present invention. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0038] The terms "first", "second", etc. in the description and claims of the embodiments of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present invention described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0039] In the embodiments of the present invention, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the embodiments of the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0040] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0041] Unless otherwise specified, the term "plurality" means two or more and "plurality" means two or more.

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention may be combined with each other.

[0043] like Figure 1-8 As shown, the present invention discloses a double tube sheet heat exchanger, comprising a base frame 1, a shell 2, two tube sheets 3, and a plurality of heat exchange tubes 4. The shell 2 is provided with a tube side fluid inlet 5, a tube side fluid outlet 6, a shell side fluid inlet 7, and a shell side fluid outlet 8. A multifunctional sliding vane 9 is provided between the two tube sheets 3 in the shell 2. The shell 2 includes an inlet shell 39 , a middle shell 40 and an outlet shell 41 , the tube sheet 3 is fixedly connected to the middle shell 40 , and the inlet shell 39 and the outlet shell 41 are both fixedly connected to the middle shell 40 .

[0044] This type of shell 2 is designed as a more commonly used installation and connection method for existing double-tube sheet 3 heat exchangers. Taking into account the practicality of the present invention, the design is based on this type of heat exchanger. In the future, no matter it is mass production, research and development or later modification, it has extremely high usability value, that is, it only needs to pretend the multifunctional slide 9 inside the existing double-tube sheet 3 heat exchange gas and add the slide drive device 10 outside to be practical, without the need for re-purchase, with high economic value, practicality and strong popularity.

[0045] The multifunctional sliding plate 9 includes a hollow sheet body 13, a plurality of wheel frames 14 are arranged around the hollow sheet body 13, a roller 15 is rotatably connected to the wheel frame 14, and the roller 15 abuts against the inner wall of the shell 2. The hollow sheet body 13 is provided with a clearance hole 16 corresponding to the position of the heat exchange tube 4, and the inner diameter of the clearance hole 16 is slightly larger than the outer diameter of the heat exchange tube 4. A plurality of air outlet pipes 17 are arranged in the clearance hole 16, and the plurality of air outlet pipes 17 are connected with the inside of the hollow sheet body 13. A sliding plate 18 is arranged on the lower side of the hollow sheet body 13, an air inlet hole 19 is arranged on the sliding plate 18, and a cover 20 is detachably arranged in the air inlet hole 19, and a fan 21 is detachably arranged on the sliding plate 18. An inner magnetic groove 22 is arranged on one side of the hollow sheet body 13, and an inner magnetic block 23 is arranged in the inner magnetic groove 22; The hollow sheet body 13 is provided with stepped holes on both sides of the positions of the plurality of clearance holes 16, and a cleaning sheet 24 is detachably connected in the stepped holes, and the inner side of the cleaning sheet 24 contacts the outer wall of the heat exchange tube 4; A slide drive device 10 is arranged outside the shell 2, and the slide drive device 10 includes two T-shaped rails 32 arranged outside the shell 2, and a sliding block 33 is slidably connected to the T-shaped rails 32. The sliding block 33 is provided with an external magnetic groove 34 on the side close to the shell 2, and an external magnetic block 35 is arranged in the external magnetic groove 34. A servo motor 36 is arranged on the sliding block 33, and the servo motor 36 is connected to a gear 37. A rack 38 is arranged on the shell 2, and the gear 37 is meshed with the rack 38. A lifting cylinder 48 is detachably arranged on the side of the sliding block 33 away from the shell, and a mounting seat 49 is arranged on the piston rod of the lifting cylinder. A rubber pad can be installed on the mounting seat, and a roller can be installed at the bottom of the rubber pad; Through the above device, when the device is used for maintenance, the lifting cylinder 48 cooperates with the sliding block 33 to realize that when the heat exchanger needs to be repaired, the sliding block 33 is moved to a suitable position, the rubber pad is installed on the mounting seat 49, and the lifting cylinder 48 is controlled to extend, so that the heat exchanger can be lifted and repaired. When the heat exchanger needs to be moved, the lifting cylinder 48 cooperates with the sliding block 33 to realize that when the heat exchanger needs to be moved, the sliding block 33 is moved to a suitable position, the roller is installed on the mounting seat 49, and the lifting cylinder 48 is controlled to extend, so that the heat exchanger can be lifted and moved.

[0046] During inspection, first clear the shell-side fluid inlet 7 and install the fan 21 at the air inlet position. (It should be noted that when the heat exchanger is in normal use, the air outlet is connected to the cover 20. When maintenance or cleaning is required, the multifunctional slide 9 can be moved to the shell-side fluid inlet 7, and the filter device 46 at the shell-side fluid inlet 7 can be manually removed, so that the fan 21 can be installed through the shell-side fluid inlet 7). At this time, the servo motor 36 is started, and the sliding block 33 is driven to move in the axial direction of the shell 2 through the meshing movement of the gear 37 and the rack 38 (it should be noted here that the servo motor 36 should be adjusted to a slow speed as much as possible, and the movement speed of the sliding block 33 should be controlled to be about 5cm-8cm per second, so as to achieve the best cleaning effect). The sliding vane driving device 10 drives the multifunctional sliding vane 9 to move in the axial direction of the shell 2, and the gas enters the air inlet 19 from the fan 21, fills the hollow sheet body 13, and then blows toward the heat exchange tube 4 from a number of air outlets. It needs to be used in conjunction with the cleaning sheet 24 (the two cleaning sheets 24 are located on the outside of the heat exchange tube 4. While realizing the cleaning function, they can provide a relatively sealed environment. If the heat exchange tube 4 is not damaged, the gas discharged from the air outlet will push open the cleaning sheet 24 when the pressure reaches a certain level, forming a short air flow to blow off the impurities on the heat exchange tube).

[0047] If the heat exchange tube 4 is damaged and has cracks or holes, gas will be blown in from the air outlet pipe 17 and enter the annular space composed of the heat exchange tube 4, the clearance hole 16 and the cleaning sheets 24 on both sides, forming a relatively sealed annular air-filled space with a certain air pressure. If there are gaps or holes in the heat exchange tube 4, the gas in the annular space will be blown into the heat exchange tube 4 from the gaps or holes and flow out from both sides of the heat exchange tube 4. At this time, one side of the heat exchange tube 4 is blocked and whether there is gas flowing out from the other end is detected, so that the damaged heat exchange tube 4 can be accurately judged, thereby realizing the judgment and replacement of the damaged heat exchange tube 4 without disassembling the tube sheet 3, greatly reducing the difficulty of replacing the heat exchange tube 4.

[0048] A guide bar 28 is disposed inside the housing 2 at a position corresponding to the roller 15 . The guide bar 28 can limit the roller 15 from moving linearly along the axis of the housing 2 . A reinforcing plate 29 is disposed between the hollow sheet 13 and the wheel frame 14 .

[0049] The optional effective way to observe the gas outflow from the heat exchange tube 4 is as follows: 1. Before inspection, remove the inlet shell 39 and the outlet shell 41, block one side of the heat exchange tube 4, and then soak the paper towel on the other side and paste it on the tube mouth of the heat exchange tube 4, start the motor and the fan 21, and make the multifunctional slide 9 move slowly (it can be moved back and forth several times for better inspection effect). After moving, check the paper towel at the tube mouth.

[0050] 2. Before inspection, remove the inlet shell 39 and the outlet shell 41, block one side of the heat exchange tube 4, and then place a paper strip on the other side, start the motor and the fan 21, and make the multifunctional slide 9 move slowly (it can move back and forth multiple times for better inspection effect). The disadvantage of this method is that it is necessary to observe the paper strip all the time, which is time-consuming.

[0051] 3. Before inspection, remove the inlet shell 39 and the outlet shell 41, block one side of the heat exchange tube 4, place a powder box behind the fan 21, and the powder box contains soluble colored powder. Start the motor and the fan 21, so that the multifunctional slide 9 moves slowly (it can move back and forth several times for better inspection effect). It is only necessary to observe which heat exchange tube 4 has powder floating out. It is more practical. After use, rinse with clean water.

[0052] The cleaning sheet 24 includes a fixing sheet 25 and a conical sheet 26 . The fixing sheet 25 and the conical sheet 26 are connected via an elastic sheet 27 . The fixing sheet 25 is provided with an inner ring fixing hole and an outer ring fixing hole.

[0053] With such arrangement, when the heat exchange tube 4 needs to be cleaned or repaired, the multifunctional slide 9 is driven by the slide drive device 10 to move along the axis direction of the shell 2, and the conical sheet 26 cooperates with the elastic sheet 27 to first clean the impurities on the outer wall of the heat exchange tube 4. The conical shape is more conducive to cleaning impurities, and the elastic sheet can ensure that it will not be stuck by large impurities. It is a cleaning step before the cleaning sheet 24 is cleaned. Double cleaning can make the cleaning effect better. The inner ring fixing hole and the outer ring fixing hole can adjust the elasticity of the inner ring part of the fixing sheet.

[0054] A drain port 30 is provided at the bottom of the sliding plate 18, and a cover sheet 31 is detachably connected to the drain port 30; The reason for such arrangement is that when the heat exchanger is in use, the multifunctional slide 9 is also inside the shell 2 and in contact with the liquid in the heat exchanger. The multifunctional slide 9 is hollow inside and is provided with an air outlet, so it is inevitable that liquid enters. When cleaning or maintenance is required, the multifunctional slide 9 can be moved to the shell-side fluid inlet 7, and the filter device 46 at the shell-side fluid inlet 7 can be manually removed, so that the cover 31 at the shell-side fluid inlet 7 can be opened to release the residual liquid in the multifunctional slide 9.

[0055] Filtering devices 46 are provided in the tube-side fluid inlet 5 , the tube-side fluid outlet 6 , the shell-side fluid inlet 7 and the shell-side fluid outlet 8 , and a plurality of lifting ears 47 are provided on the shell 2 .

[0056] Such an arrangement can prevent the entry of external fluid into the heat exchanger and the introduction of impurities that may damage the heat exchanger structure. The arrangement of the lifting lug 47 can ensure that the heat exchanger is easy to carry and move.

[0057] A first sealing device 11 is provided between the shell 2 and the tube sheet 3, and a second sealing device 12 is provided between the tube sheet 3 and the heat exchange tube 4. The first sealing device 11 includes a first N-shaped sealing ring 42 provided between the inlet shell 39, the tube sheet 3 and the middle shell 40, and also includes a second N-shaped sealing ring 43 provided between the outlet shell 41, the tube sheet 3 and the middle shell 40. The first N-shaped sealing ring 42 and the second N-shaped sealing ring 43 are both provided with a plurality of annular grooves, and a sealing ring 44 with a circular cross section is provided in the annular groove. The second sealing device 12 includes a rubber ring 45 provided between the tube sheet 3 and the heat exchange tube 4, and the cross section of the rubber ring 45 is a trapezoidal setting.

[0058] With such a configuration, the first and second N-shaped sealing rings 43 can provide the first layer of anti-leakage, and the annular groove and the sealing ring 44 can provide the second layer of sealing, and the double protection can ensure that no leakage occurs. The connection method between the tube sheet 3 and the heat exchange tube 4 is simple, and the unique compression deformation characteristics of the trapezoidal sealing ring can ensure that the tube sheet 3 and the heat exchange tube 4 are tightly connected to prevent leakage.

[0059] Application scenario of an exemplary embodiment: The double-tube sheet heat exchanger involved in the present invention has a conventional shell design, which is a more commonly used installation and connection method for existing double-tube sheet heat exchangers. Considering the practicality of the present invention, the design is based on this form of heat exchanger. In the future, whether it is mass production, research and development or later modification, it has extremely high usability value.

[0060] In normal use, the heat exchange operation is realized by connecting the conventional tube-side fluid inlet 5, tube-side fluid outlet 6, shell-side fluid inlet 7 and shell-side fluid outlet 8 to the external pipeline. At this time, the shell-side fluid inlet 7 and the shell-side fluid outlet 8 are connected to the inside of the shell 2 and are in contact with the multifunctional sliding vane 9 designed by the present invention. However, since the multifunctional sliding vane 9 is made of hollow material and can be located on one side of the heat exchanger, close to the tube sheet 3, when the heat exchanger does not need to be cleaned or overhauled, it does not affect the overall heat exchange operation of the heat exchanger. In order to prevent part of the shell-side fluid from entering the inside of the multifunctional sliding vane 9 during use and causing an impact, the multifunctional sliding vane 9 is provided with a cleaning sheet 24 at each opening, which can serve as a barrier to prevent liquid from flowing in. If liquid still flows in accidentally, the drain port 30 provided at the bottom of the multifunctional sliding vane 9 can also discharge the residual liquid immediately when maintenance or cleaning is required.

[0061] When the equipment is not damaged and needs to be cleaned regularly, the entire shell 2 does not need to be moved or disassembled. At this time, the servo motor 36 is started, and the sliding block 33 is driven to move in the axial direction of the shell 2 through the meshing movement of the gear 37 and the rack 38 (it should be noted here that the servo motor 36 should be adjusted to a slow speed as much as possible, and the movement speed of the sliding block 33 should be controlled to be about 5cm-8cm per second, and the cleaning effect is best). The slide drive device 10 drives the multifunctional slide 9 to move in the axial direction of the shell 2. At this time, the cleaning sheet 24 and the conical sheet 26 arranged on the multifunctional slide 9 move with the multifunctional slide 9. The conical sheet 26 cooperates with the elastic sheet 27 to first clean the impurities on the outer wall of the heat exchange tube 4. The conical shape is more conducive to cleaning impurities. The spring sheet can ensure that it will not be stuck by large impurities. It is a cleaning step before the cleaning sheet 24 is cleaned. Double cleaning can make the cleaning effect better.

[0062] When the equipment has been confirmed to be damaged and there are leakage, mixed liquid and other phenomena, it is necessary to first clear the shell-side fluid inlet 7 and install the fan 21 at the air inlet 19. (It should be noted that when the heat exchanger is in normal use, the air outlet is connected to the cover 20. When it needs to be repaired or cleaned, the multifunctional slide 9 can be moved to the shell-side fluid inlet 7, and the filter device 46 at the shell-side fluid inlet 7 can be manually removed, so as to install the fan 21 through the shell-side fluid inlet 7. At this time, the servo motor 36 is started, and the sliding block 33 is driven to move in the axial direction of the shell 2 through the meshing movement of the gear 37 and the rack 38 (it should be noted here that the servo motor 36 should be adjusted to a slow speed as much as possible, and the movement speed of the sliding block 33 should be controlled to be about 5cm-8cm per second, so as to achieve the best cleaning effect). The slide drive device 10 drives the multifunctional slide 9 to move in the axial direction of the shell 2, and the gas enters the air inlet 19 from the fan 21, fills the hollow sheet body 13, and then blows to the heat exchange tube 4 from several air outlets. It needs to be used with the cleaning sheet 24.

[0063] It should be noted that when the heat exchange tube 4 is checked for damage, there are two working conditions: 1. The heat exchange tube is not damaged: the fan 21 blows air into the multifunctional sliding plate 9 from the air inlet 19 and blows it out from the air outlet pipe 17 in the clearance hole 16. At this time, the clearance hole 16, the heat exchange tube 4 and the fixing plates 25 on both sides form an annular space. Since the inner diameter of the fixing plate 25 is substantially the same as the outer diameter of the heat exchange tube 4, the air blown out from the air outlet pipe 17 can form a certain air pressure in the annular space. Since the heat exchange tube 4 is not damaged and the fixing plate 25 is made of a flexible material, when the air pressure generated in the annular space can overcome the elastic force of the fixing plate 25 itself, the fixing plate 25 is deformed and the annular space is destroyed, so that the gas overflows from between the fixing plate 25 and the heat exchange tube 4. At this time, the overflowing gas can blow off the smaller impurities on the heat exchange tube 4, and the intermittent overflow of the gas can also make the fixing plate 25 made of a flexible material touch the heat exchange tube 4 to generate vibration, which can also shake off some impurities attached to the heat exchange tube 4.

[0064] 2. The heat exchange tube 4 is damaged: the fan 21 blows the air into the multifunctional slide 9 from the air inlet 19, and blows it out from the air outlet 17 in the clearance hole 16. At this time, the clearance hole 16, the heat exchange tube 4 and the fixing plates 25 on both sides form an annular space. Since the inner diameter of the fixing plate 25 is roughly the same as the outer diameter of the heat exchange tube 4, the air blown out from the air outlet 17 can form a certain air pressure in the above annular space. Since the heat exchange tube 4 is damaged and there are gaps or holes, the gas in the annular space can be blown into the damaged heat exchange tube 4 under the action of air pressure, so that there is gas flow in the damaged heat exchange tube 4. In this way, it is only necessary to detect that one or several of all the heat exchange tubes 4 have gas flow inside, and it can be determined that this one or several heat exchange tubes 4 are damaged heat exchange tubes. (Since this heat exchange tube 4 is damaged and needs to be replaced, it is not necessary to use the gas blown out of the annular space to clean its outer surface.) When selecting the multifunctional sliding plate 9 inside the existing heat exchanger, the fixing plate 25 can be fixed by the inner ring fixing hole or the outer ring fixing hole according to the damage frequency of the heat exchange tube 4 of the existing heat exchanger. Since the inner ring fixing hole and the outer ring fixing hole can adjust the elasticity of the inner ring part of the fixing plate 25, such a setting can adjust the elasticity of the inner ring of the fixing plate 25 before use by selecting the appropriate fixing hole position, so as to control the maximum value of the gas pressure in the above annular space and optimize the maintenance effect.

[0065] If the heat exchange tube 4 is damaged and has cracks or holes, gas will be blown in from the air outlet pipe 17 and enter the annular space composed of the heat exchange tube 4, the clearance hole 16 and the cleaning sheets 24 on both sides, forming a relatively sealed annular air-filled space with a certain air pressure. If there are gaps or holes in the heat exchange tube 4, the gas in the annular space will be blown into the heat exchange tube 4 from the gaps or holes and flow out from both sides of the heat exchange tube 4. At this time, one side of the heat exchange tube 4 is blocked and whether there is gas flowing out from the other end is detected, so that the damaged heat exchange tube 4 can be accurately judged, thereby realizing the judgment and replacement of the damaged heat exchange tube 4 without disassembling the tube sheet 3, greatly reducing the difficulty of replacing the heat exchange tube 4.

[0066] The above description and the accompanying drawings fully illustrate the embodiments of the present invention so that those skilled in the art can practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The embodiments of the present invention are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A double tube sheet heat exchanger, characterized in that: include: A base frame (1) and a shell (2) fixed on the base frame (1), wherein two tube sheets (3) are arranged in the shell (2), a plurality of heat exchange tubes (4) are arranged between the two tube sheets (3), a tube-side fluid inlet (5), a tube-side fluid outlet (6), a shell-side fluid inlet (7) and a shell-side fluid outlet (8) are respectively arranged on the shell (2), a multifunctional sliding vane (9) is arranged between the two tube sheets (3) in the shell (2), a sliding vane driving device (10) is arranged outside the shell (2), a first sealing device (11) is arranged between the shell (2) and the tube sheet (3), and a second sealing device (12) is arranged between the tube sheet (3) and the heat exchange tube (4); The multifunctional sliding plate (9) comprises a hollow sheet body (13), a plurality of wheel frames (14) are arranged on the circumference of the hollow sheet body (13), a roller (15) is rotatably connected to the wheel frame (14), the roller (15) abuts against the inner wall of the shell (2), and the hollow sheet body (13) is provided with a clearance hole (16) corresponding to the position of the heat exchange tube (4), the inner diameter of the clearance hole (16) is slightly larger than the outer diameter of the heat exchange tube (4), and a plurality of air outlet pipes (16) are arranged in the clearance hole (16). 17), a plurality of the air outlet pipes (17) are connected to the interior of the hollow sheet (13), a sliding plate (18) is provided on the lower side of the hollow sheet (13), an air inlet hole (19) is provided on the sliding plate (18), a cover (20) is detachably provided in the air inlet hole (19), a fan (21) is detachably provided on the sliding plate (18), an inner magnetic groove (22) is provided on one side of the hollow sheet (13), and an inner magnetic block (23) is provided in the inner magnetic groove (22); The hollow sheet body (13) is provided with stepped holes on both sides of the plurality of the clearance holes (16), a cleaning sheet (24) is detachably connected in the stepped hole, and the inner side of the cleaning sheet (24) is in contact with the outer wall of the heat exchange tube (4); The cleaning sheet (24) comprises a fixing sheet (25) and a conical sheet (26); the fixing sheet (25) and the conical sheet (26) are connected via an elastic sheet (27); and the fixing sheet (25) is provided with an inner ring fixing hole and an outer ring fixing hole.

2. A double tube sheet heat exchanger according to claim 1, characterized in that: A guide bar (28) is provided on the inner side of the housing (2) at a position corresponding to the roller (15), and the guide bar (28) can limit the roller (15) from linearly moving along the axis direction of the housing (2). A reinforcing plate (29) is provided between the hollow sheet body (13) and the wheel frame (14).

3. A double tube sheet heat exchanger according to claim 1, characterized in that: A liquid discharge port (30) is provided at the bottom of the sliding plate (18), and a cover plate (31) is detachably connected to the liquid discharge port (30).

4. A double tube sheet heat exchanger according to claim 1, characterized in that: The slide drive device (10) comprises two T-shaped rails (32) arranged on the outside of the shell (2), a sliding block (33) is slidably connected to the T-shaped rails (32), an external magnetic groove (34) is provided on the side of the sliding block (33) close to the shell (2), an external magnetic block (35) is arranged in the external magnetic groove (34), a servo motor (36) is arranged on the sliding block (33), the servo motor (36) is connected to a gear (37), a rack (38) is arranged on the shell (2), the gear (37) meshes with the rack (38), a lifting cylinder (48) is detachably arranged on the side of the sliding block (33) away from the shell (2), a mounting seat (49) is arranged on the piston rod of the lifting cylinder (48), a rubber pad can be installed on the mounting seat (49), and a universal wheel can be installed at the bottom of the rubber pad.

5. The double tube sheet heat exchanger according to claim 1, characterized in that: The shell (2) comprises an inlet shell (39), a middle shell (40) and an outlet shell (41); the tube sheet (3) is fixedly connected to the middle shell (40); the inlet shell (39) and the outlet shell (41) are both fixedly connected to the middle shell (40); the first sealing device (11) comprises a first N-shaped sealing ring (42) arranged between the inlet shell (39), the tube sheet (3) and the middle shell (40); and a second N-shaped sealing ring (43) arranged between the outlet shell (41), the tube sheet (3) and the middle shell (40); a plurality of annular grooves are arranged on the first N-shaped sealing ring (42) and the second N-shaped sealing ring (43); and a sealing ring (44) having a circular cross section is arranged in the annular groove.

6. A double tube sheet heat exchanger according to claim 1, characterized in that: The second sealing device (12) comprises a rubber ring (45) arranged between the tube sheet (3) and the heat exchange tube (4), and the cross section of the rubber ring (45) is trapezoidal.

7. The double tube sheet heat exchanger according to claim 1, characterized in that: The tube-side fluid inlet (5), the tube-side fluid outlet (6), the shell-side fluid inlet (7) and the shell-side fluid outlet (8) are all provided with filtering devices (46), and the shell (2) is provided with a plurality of lifting ears (47).

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