A fluorine-coated steel heat exchanger containing a turbulence intensifier structure

Abstract

The application relates to the technical field of heat exchangers and discloses a fluorine-coated steel heat exchanger containing a turbulent flow strengthening insert structure, which comprises a tube shell with a base fixedly sleeved on an outer wall, head covers are installed at the left and right ends of the tube shell, tube plates are symmetrically installed on the inner wall of the tube shell, heat exchange pipes are symmetrically installed on the left and right two tube plates, the heat exchange pipes are installed in a plurality of groups, the plurality of heat exchange pipes are symmetrically distributed in two groups in an up-down mode, and baffle plates are symmetrically and slidably sleeved on the outer walls of the heat exchange pipes in each group. The fluorine-coated steel heat exchanger containing the turbulent flow strengthening insert structure can effectively solve the problems that, in the prior art, the smooth inner wall of a fluorine-coated steel heat exchanger cannot break the stable laminar boundary layer in the tube under the working condition of a strong corrosive medium, the heat conduction thermal resistance of the fluorine-coated layer is enlarged, the heat exchange efficiency is greatly reduced, the corrosion-resistant layer is easily scratched and abraded in the installation and operation of conventional heat exchange pipe inserts, the corrosion-resistant layer is caused to fail, and the problems of base material corrosion perforation and medium leakage risk are caused.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more specifically to a fluoropolymer-coated steel heat exchanger with a reinforced turbulent flow internal insert structure. Background Technology

[0002] Fluorine-coated steel heat exchangers are core equipment in heat exchange systems for highly corrosive media. The inner walls of their heat exchange tubes are coated with a fluoropolymer anti-corrosion layer, combining the structural strength of the metal substrate with the excellent corrosion resistance of fluoropolymers. Their heat exchange efficiency, operational reliability, and corrosion resistance life directly determine the energy efficiency, production continuity, and operational safety of the entire process system. Fluorine-coated steel heat exchangers generally employ a smooth inner wall heat exchange tube structure. Conventional designs focus only on optimizing the anti-corrosion performance of the fluoropolymer coating. During operation, a stable laminar boundary layer exists within the tubes. This stable laminar boundary layer is a thin layer of fluid tightly adhering to the heat exchange tube wall, with extremely low velocity and no radial mixing, and is the main source of thermal resistance in the heat exchange process.

[0003] To address this issue, this application designs a fluoropolymer-coated steel heat exchanger with an enhanced turbulence internal insert structure. Existing fluoropolymer-coated steel heat exchangers, under highly corrosive media heat exchange conditions, if the smooth inner wall of the heat exchange tubes cannot break the stable laminar boundary layer of the fluid inside the tubes, will further amplify the thermal conductivity and thermal resistance disadvantage of the fluoropolymer coating, leading to a significant decrease in the overall heat exchange efficiency. This necessitates a substantial increase in the heat exchange area or the use of enhanced internal inserts to meet process requirements. Conventional enhanced internal inserts for heat exchange tubes (internal fins, baffles, etc.) are not designed to address the protection requirements of the fluoropolymer coating. During installation and operation, they can scratch and wear down the anti-corrosion layer on the inner wall, causing the anti-corrosion layer to fail, leading to substrate corrosion perforation and the risk of media leakage. Furthermore, existing internal inserts cannot simultaneously address turbulence enhancement and flow resistance control under wide flow velocity conditions, making it difficult to effectively break the laminar boundary layer and resulting in insufficient heat exchange enhancement. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a fluoropolymer-coated steel heat exchanger with a reinforced turbulent flow internal insert structure. This effectively solves the problems in existing technologies where, under highly corrosive media conditions, the smooth inner wall of the fluoropolymer-coated steel heat exchanger cannot break the stable laminar flow boundary layer inside the tube, amplifying the thermal resistance disadvantage of the fluoropolymer coating and leading to a significant decrease in heat exchange efficiency. Furthermore, conventional heat exchange tube internal inserts are prone to scratching and abrasion of the anti-corrosion layer during installation and operation, causing failure and leading to substrate corrosion perforation and media leakage risks.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a fluoropolymer-coated steel heat exchanger with a reinforced turbulent flow internal insert structure, comprising: The outer wall of the tube shell is fixedly fitted with a base. Both ends of the tube shell are equipped with end caps. Tube sheets are symmetrically installed on the inner wall of the tube shell. Heat exchange tubes are installed through the two tube sheets. There are several heat exchange tubes installed. The heat exchange tubes are symmetrically distributed in two groups. Each group of heat exchange tubes is symmetrically fitted with baffles on the outer wall. A turbulence enhancement section is provided inside the heat exchange tube. An installation adjustment section is provided on both the tube shell and the turbulence enhancement section. The enhanced turbulence section includes support tubes symmetrically arranged on the inner wall of the heat exchange tube. The support tubes are hollow tube structures with rounded corners at both ends. Several sets of evenly distributed circumferential balls are embedded on the outer wall of the support tubes. Several evenly distributed circumferential flow holes are opened on the outer wall of the support tubes located on the outside of the heat exchange tubes. Turbulence groups are set on both the left and right support tubes. The installation and adjustment unit includes positioning plates located inside both left and right end caps. The end of the positioning plate away from the tube sheet has a receiving groove, and a sealing plate is installed on the inner wall of the receiving groove. The support tube and the sealing plate are jointly provided with an installation positioning assembly.

[0006] Furthermore, the two upper baffles and the two lower baffles are evenly distributed in an alternating manner, and the outer wall of the baffles is fixedly connected to the inner wall of the tube shell. Each set of balls consists of several balls that are linearly and evenly distributed, and the balls roll and contact the inner wall of the heat exchange tube.

[0007] Furthermore, the installation adjustment section also includes through holes on the positioning plate and the sealing plate corresponding to several support tubes. The positioning plate has alignment holes on the end near the tube sheet corresponding to several support tubes. The alignment holes are designed in an oblong shape and are connected to the corresponding through holes. A connecting frame is installed in the middle of the end of the sealing plate away from the tube sheet. The connecting frame consists of an oblong plate and a round rod. An electric push rod for driving the connecting frame to move back and forth is installed through the end of the end cap away from the tube shell.

[0008] Furthermore, several rectangularly evenly distributed support rods are installed through both the left and right tube sheets. Guide grooves are provided at both ends of the support rods. Limiting slide rods are installed on the end of the positioning plate near the tube sheet for several support rods. The outer wall of the limiting slide rod is slidably connected to the inner wall of the corresponding guide groove.

[0009] Furthermore, the spoiler assembly includes elastic spoiler strips installed at the opposite ends of the left and right support tubes. Several elastic limiting ropes evenly distributed in a circle are also installed at the opposite ends of the left and right support tubes, and the elastic limiting ropes slide through the elastic spoiler strips.

[0010] Furthermore, the mounting and positioning assembly includes a mounting shaft that is rotatably mounted at one end of the support tube near the positioning plate. The outer wall of the mounting shaft is movably fitted against the inner wall of the corresponding perforation, and mounting grooves are symmetrically opened on the outer wall of the mounting shaft corresponding to the positioning insertion holes. Magnetic ear seats are slidably mounted on the inner wall of the mounting grooves by means of compression springs.

[0011] Furthermore, the installation positioning assembly also includes positioning magnets embedded in the sealing plate, and there are several positioning magnets embedded in the plate. The several positioning magnets are evenly distributed from top to bottom and correspond one-to-one with each row of heat exchange tubes. The positioning magnets have circular notches on several perforations.

[0012] Furthermore, the lower side of the outer wall of the positioning plate is provided with several drainage holes that are evenly distributed in a circle, and the drainage holes are connected to the corresponding receiving grooves.

[0013] The technical solution provided by this invention has the following advantages compared with the prior art: This invention provides a fluoropolymer-coated steel heat exchanger with an enhanced turbulence internal insert structure. During the assembly and pre-adjustment stage, firstly, the two magnetic lugs on the mounting shaft are simultaneously pressed to retract into the mounting groove. The support tube and mounting shaft are then slowly inserted from one end of the heat exchange tube. After the elastic turbulence-inducing strip and elastic limiting rope are fully inserted, the other side of the support tube is simultaneously pushed in to a sufficient length. Next, the limiting slide rod on the positioning plate is aligned with the guide groove of the support rod. Each mounting shaft is rotated sequentially to align the magnetic lug with the alignment hole, pushing the positioning plate onto the outer wall of all mounting shafts. Each mounting shaft is then rotated to stagger the magnetic lug with the alignment hole. Finally, according to the actual operating flow rate requirements, the positioning plate and sealing plate are moved axially by two electric push rods on the left and right sides, simultaneously adjusting the axial spacing of the left and right support tubes within all heat exchange tubes. This stage achieves damage-free pre-assembly of the enhanced turbulence section, centralized rapid positioning, and pre-adjustment for different operating conditions, completely solving the technical problems of easy damage to the fluoropolymer coating, low assembly efficiency, and inability to pre-adjust during conventional internal insert installation.

[0014] During the heat exchange operation phase, the elastic limiting rope is in a relaxed state at low flow rates, completely unrestricting the deployment of the elastic baffles and maintaining their pre-adjusted maximum spiral deployment. At medium to high flow rates, the elastic limiting rope gradually straightens, working together with the elastic baffles to resist fluid impact. When the flow rate reaches the design maximum, the elastic limiting rope is fully straightened, limiting further deformation of the elastic baffles. This stage, through the coordinated operation of the elastic baffles and the elastic limiting rope, achieves a dynamic balance between turbulence enhancement and flow resistance under wide flow rate conditions. Simultaneously, it effectively absorbs fluid vibrations, protecting the integrity of the fluorine coating and solving the technical problems of conventional internal inserts being unable to handle wide flow rate conditions and easily wearing down the anti-corrosion coating during operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the three-dimensional separation of the tube sheet, heat exchange tubes, and baffles in an embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram of the tube sheet, heat exchange tubes, and mounting and adjusting parts in an embodiment of the present invention; Figure 4 This is a schematic diagram of the three-dimensional separation of the heat exchange tube and the enhanced turbulence section in an embodiment of the present invention; Figure 5 This is a schematic diagram of a partial three-dimensional cross-section of the support tube and mounting shaft in an embodiment of the present invention; Figure 6 This is a schematic diagram of a partial three-dimensional cross-section of the end cap and the mounting adjustment part in an embodiment of the present invention; Figure 7 This is a schematic diagram of the three-dimensional separation of the positioning plate, sealing plate, and connecting frame in an embodiment of the present invention; Figure 8 This is a three-dimensional structural diagram of the tube sheet, support rod, and positioning plate in an embodiment of the present invention; Figure 9 This is a three-dimensional structural diagram of the positioning plate, sealing plate, and mounting positioning assembly in an embodiment of the present invention; Figure 10 For the present invention Figure 9 A magnified structural schematic diagram of a partial cross-section at point X in the middle; Figure 11 This is a schematic diagram of the three-dimensional positioning and installation state transformation structure of the mounting shaft and positioning plate in an embodiment of the present invention.

[0017] The labels in the diagram represent: 1. Tube shell; 2. Base; 3. Head cap; 4. Tube sheet; 41. Support rod; 42. Guide groove; 5. Heat exchange tube; 6. Baffle plate; 7. Turbulence enhancement section; 71. Support tube; 72. Ball bearing; 73. Flow passage; 74. Turbulence assembly; 741. Elastic turbulence strip; 742. Elastic limiting rope; 8. Installation adjustment section; 81. Positioning plate; 811. Limiting slide rod; 812. Drain hole; 82. Sealing plate; 83. Perforation; 84. Alignment insertion hole; 85. Connecting frame; 86. Electric push rod; 87. Installation positioning assembly; 871. Installation shaft; 872. Magnetic lug; 873. Positioning magnet. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to embodiments. Example

[0020] Please see Figures 1-11 This invention provides a technical solution: a fluorinated steel heat exchanger with a reinforced turbulent flow internal insert structure, comprising: A tube shell 1 with a base 2 is fixedly fitted on the outer wall. End caps 3 are installed at both ends of the tube shell 1. Tube plates 4 are symmetrically installed on the inner wall of the tube shell 1. Heat exchange tubes 5 are installed through the two tube plates 4. Several heat exchange tubes 5 are installed. The heat exchange tubes 5 are symmetrically distributed in two groups. Baffles 6 are symmetrically slidably fitted on the outer wall of each group of heat exchange tubes 5. A turbulence enhancement section 7 is provided inside the heat exchange tubes 5. An installation adjustment section 8 is provided on both the tube shell 1 and the turbulence enhancement section 7. The enhanced turbulence section 7 includes support tubes 71 symmetrically arranged on the inner wall of the heat exchange tube 5. The support tubes 71 are hollow tube structures with rounded corners at both ends. Several sets of evenly distributed circumferential balls 72 are embedded on the outer wall of the support tubes 71. Several evenly distributed circumferential flow holes 73 are opened on the outer wall of the support tubes 71 located outside the heat exchange tube 5. The flow holes 73 are rectangular. Turbulence groups 74 are jointly provided on the left and right support tubes 71. The installation adjustment part 8 includes positioning plates 81 located inside the left and right end caps 3. The end of the positioning plate 81 away from the tube plate 4 has a receiving groove. The receiving groove is circular. A sealing plate 82 is installed on the inner wall of the receiving groove. The support tube 71 and the sealing plate 82 are jointly provided with an installation positioning group 87.

[0021] The two upper baffles 6 and the two lower baffles 6 are evenly distributed in an alternating manner, and the outer wall of the baffles 6 is fixedly connected to the inner wall of the tube shell 1. Each set of balls 72 consists of several balls 72 that are evenly distributed in a linear manner, and the balls 72 roll and contact the inner wall of the heat exchange tube 5.

[0022] The installation adjustment part 8 also includes through holes 83 on the positioning plate 81 and the sealing plate 82, which are common to several support tubes 71. The through holes 83 are circular. The positioning plate 81 is provided with alignment holes 84 on several support tubes 71 at the end near the tube plate 4. The alignment holes 84 are waist-shaped and are connected to the corresponding through holes 83. A connecting frame 85 is installed in the middle of the end of the sealing plate 82 away from the tube plate 4. The connecting frame 85 is composed of a waist-shaped plate and a round rod. An electric push rod 86 for driving the connecting frame 85 to move back and forth is installed through the end of the end cap 3 away from the tube shell 1.

[0023] Several rectangular, evenly distributed support rods 41 are installed through both the left and right tube sheets 4. Guide grooves 42 are provided at both ends of the support rods 41. The guide grooves 42 are circular. Limiting slide rods 811 are installed on the end of the positioning plate 81 near the tube sheet 4, corresponding to several support rods 41. The outer wall of the limiting slide rods 811 is slidably connected to the inner wall of the corresponding guide grooves 42.

[0024] The spoiler assembly 74 includes an elastic spoiler strip 741 installed at the opposite ends of the left and right support tubes 71. Several elastic limiting ropes 742 evenly distributed in a circle are also installed at the opposite ends of the left and right support tubes 71. The elastic limiting ropes 742 slide through the elastic spoiler strip 741.

[0025] The mounting and positioning assembly 87 includes a mounting shaft 871 that is rotatably mounted at one end of the support tube 71 near the positioning plate 81. The outer wall of the mounting shaft 871 is movably fitted to the inner wall of the corresponding through hole 83. The outer wall of the mounting shaft 871 is symmetrically provided with mounting grooves above and below the corresponding positioning insertion hole 84. The mounting grooves are rectangular in design, and magnetic ear seats 872 are slidably mounted on the inner wall of the mounting grooves by means of compression springs.

[0026] The mounting positioning assembly 87 also includes a positioning magnet 873 embedded in the sealing plate 82. The positioning magnet 873 has an oblong structure and several positioning magnets 873 are embedded in it. The several positioning magnets 873 are evenly distributed from top to bottom and correspond one-to-one with each row of heat exchange tubes 5. The positioning magnet 873 has a circular notch on each of the several perforations 83.

[0027] The lower side of the outer wall of the positioning plate 81 has several drainage holes 812 that are evenly distributed in a circle, and the drainage holes 812 are connected to the corresponding receiving grooves.

[0028] In practice: First, the enhanced turbulence section 7 in this application generates a strong turbulence effect inside the fluorinated steel heat exchange tube 5, effectively breaking the stable laminar boundary layer of the fluid inside the tube, offsetting the thermal resistance disadvantage of the fluorinated coating, and significantly improving the tube-side heat exchange efficiency. At the same time, the rolling contact and adaptive deformation design completely avoids the scratching and wear of the fluorinated coating of the heat exchange tube 5 by the internal plug during installation and operation, protecting the integrity of the anti-corrosion layer. The installation and adjustment section 8 is used to realize the rapid positioning and installation and removal of the enhanced turbulence section 7 inside the heat exchange tube 5. It can perform installation and removal maintenance operations on the heat exchange tube 5 one by one, and can also adjust the distance between the two support tubes 71 on the left and right. Then, by controlling the spiral tilt angle of the elastic turbulence bar 741, it can achieve both turbulence enhancement and flow resistance control under wide flow velocity conditions, ensuring the heat exchange enhancement effect. At the same time, with the dual positioning method of magnetic adsorption and mechanical limit, the enhanced turbulence section 7 can be axially locked during operation, avoiding its movement and vibration under fluid impact, which would lead to the wear of the fluorinated coating or the decrease in the heat exchange enhancement effect.

[0029] It is worth emphasizing that the mounting shaft 871 is mounted on the support tube 71 by damping rotation. After the mounting shaft 871 has been angled, it will not deviate in angle without external interference. The elastic baffle 741 needs to have excellent corrosion resistance, good elasticity and fatigue resistance, low hardness and moderate temperature resistance. The elastic limiting rope 742 needs to have high strength, wear resistance, corrosion resistance and good flexibility. The outer hardness of the elastic baffle 741 and the elastic limiting rope 742 is lower than the hardness of the fluorine coating of the heat exchange tube 5, to ensure that the elastic baffle 741 and the elastic limiting rope 742 will not scratch the fluorine coating inside the heat exchange tube 5. In addition, in the mounting adjustment part 8 in the base 2, all parts that will come into contact with the tube fluid must be made of corrosion-resistant and high-temperature resistant materials or have special coating treatment.

[0030] It should be noted that the several ball bearings 72 embedded on the outer wall of the support tube 71, the elastic turbulence strips 741 in the turbulence group 74, and the elastic limiting ropes 742 together form an adaptive enhanced turbulence inner insert. The rolling contact design of the ball bearings 72 replaces the sliding contact of the traditional inner insert. Combined with the rounded corners at both ends of the support tube 71, it can avoid sliding friction between the inner insert and the inner wall of the heat exchange tube 5, and can also avoid damage to the tube opening and the fluorine coating of the heat exchange tube 5 during the installation of the support tube 71.

[0031] It should also be noted that the electric push rod 86, connecting frame 85, sealing plate 82, positioning plate 81 and installation positioning group 87 can jointly form a centralized spacing adjustment mechanism. By driving the corresponding positioning plates 81 to move closer or further apart along the axial direction through the two electric push rods 86 on the left and right, the axial spacing of the two support tubes 71 on the left and right in several heat exchange tubes 5 can be adjusted at the same time, thereby changing the pre-tightening degree and spiral tilt angle of the elastic turbulence strip 741, and thus pre-adjusting for different design flow rate conditions. Among them, the magnetic ear seat 872 and the positioning magnet 873 in the installation positioning group 87 can form a dual positioning of magnetic adsorption and mechanical limit, which not only ensures the axial stability of the enhanced turbulence section 7 during operation, but also facilitates subsequent quick disassembly and maintenance.

[0032] In the initial state, several heat exchange tubes 5 are welded together on the left and right tube sheets 4. The heat exchange tubes 5 are symmetrically distributed in two groups, and the upper and lower baffles 6 are evenly distributed in an alternating manner and welded to the inner wall of the tube shell 1. The two upper baffles 6 and the two lower baffles 6 are evenly distributed in an alternating manner. Several support rods 41 are installed together on the left and right tube sheets 4.

[0033] During the pre-installation stage of the enhanced turbulence section 7, the operator first simultaneously presses down on the two magnetic lugs 872 on one of the mounting shafts 871, causing them to fully retract into their corresponding mounting slots to avoid obstructing the insertion of the support tube 71 and mounting shaft 871 into the heat exchange tube 5. Then, the support tube 71 and mounting shaft 871 are slowly inserted together from one end of the heat exchange tube 5. During this process, several ball bearings 72 on the outer wall of the support tube 71 will roll and contact the inner wall of the heat exchange tube 5. The support tube 71 and mounting shaft 871 will drive the elastic baffle 741 and elastic limiting rope 742 to enter the heat exchange tube 5 at a uniform speed. Once the elastic baffle 741 and elastic limiting rope 742 are fully inserted into the heat exchange tube 5, the operator then continues to insert the other support tube 771. The support tube 71 is pushed into the heat exchange tube 5 to a sufficient length, eliminating the need for the remaining installation shaft 871 to also enter the heat exchange tube 5. The elastic turbulence strip 741 and the elastic limiting rope 742 adopt a coordinated design of main turbulence and auxiliary limiting. The elastic turbulence strip 741, as the core turbulence element, generates continuous vortices and secondary flow through its own spiral structure. The elastic limiting rope 742, as a flexible constraint element, does not restrict the free bending and deformation of the elastic turbulence strip 741 within the normal flow velocity range, but can also precisely control its maximum deformation, ensuring that the two maintain a uniform relative position along the entire length direction. This avoids excessive twisting or deformation of the elastic turbulence strip 741 in some areas, which could lead to excessive contact with the inner wall of the heat exchange tube 5 and damage to it.

[0034] After the previous mounting shaft 871 is fully extended from inside the heat exchange tube 5, under the action of the compression spring, the two corresponding magnetic lugs 872 will extend out of their respective mounting slots and return to their original positions. Then, the positions of the left and right support tubes 71 relative to the heat exchange tube 5 need to be adjusted. It is also necessary to ensure that the several flow holes 73 on the support tube 71 are all located on the outside of the heat exchange tube 5, so that the liquid medium transported in the heat exchange tube 5 can flow through and be discharged during the subsequent operation of the heat exchanger. The length of the support tube 71 located on the outside of the heat exchange tube 5 should be approximately the same. This completes the pre-installation of the enhanced turbulence section 7 inside a single heat exchange tube 5. Repeat the above steps until the pre-installation of the enhanced turbulence section 7 inside all heat exchange tubes 5 is completed. The entire pre-installation process does not require any special tools, is simple and efficient, and can be easily completed by a single person to pre-install several heat exchange tubes 5. The entire process will not cause any damage to the fluorine coating on the inner wall of the heat exchange tube 5.

[0035] In the final positioning stage of the heat exchanger assembly and internal components, after the pre-installation of the enhanced turbulence section 7 inside all heat exchange tubes 5 is completed, positioning plates 81 need to be installed sequentially on the left and right sides of the tube shell 1. Specifically, the operator first installs one of the positioning plates 81, aligning the several limiting slide rods 811 on this positioning plate 81 with the guide grooves 42 on the corresponding support rods 41. On the outside of the tube shell 1, the positioning plate 81 is simultaneously aligned with the mounting shafts 871 that are rotatably installed on several support tubes 71. Then, the operator rotates each mounting shaft 871 to a suitable angle so that the angle of the magnetic lug 872 is completely aligned with the corresponding waist-shaped alignment hole 84. Then, the positioning plate 81 is slowly pushed towards the side closer to the tube sheet 4 until it is fixed. Positioning plate 81 is simultaneously movably sleeved on the outer wall of several mounting shafts 871. During this process, the mounting shafts 871 will pass through the corresponding through holes 83 on the positioning plate 81 and the sealing plate 82. The two magnetic lugs 872 on the mounting shafts 871 will enter the receiving grooves on the positioning plate 81, and the end of the magnetic lug 872 away from the tube sheet 4 will movably fit against the corresponding sealing plate 82. By using the cooperation of the limiting slide rod 811 and the guide groove 42, the coaxiality of the axial movement of the positioning plate 81 can be guaranteed, and the misalignment of the mounting shafts 871 and the through holes 83 can be prevented. In addition, by adjusting the magnetic lugs 872 one by one to align with the alignment holes 84, the installation alignment accuracy of the positioning plate 81 and the mounting shafts 871 can be guaranteed, while retaining the flexibility to install, remove and maintain each heat exchange tube 5 individually.

[0036] After several mounting shafts 871 have passed through the corresponding through holes 83 on the positioning plate 81 and the sealing plate 82, the operator continues to rotate each mounting shaft 871 90 degrees in sequence, so that the two magnetic lugs 872 on the mounting shaft 871 rotate 90 degrees synchronously until they are 90 degrees intersecting with the corresponding alignment holes 84. At this time, the positioning plate 81 and the sealing plate 82 together form a reliable mechanical limit, and the magnetic lugs 872 will not be able to exit from the alignment holes 84. At the same time, several positioning magnets 873 on the sealing plate 82 will generate magnetic attraction force on the corresponding magnetic lugs 872. At this time, several magnetic lugs 872 will be magnetically connected to the corresponding positioning magnets 873, thereby completing the positioning and locking effect of several mounting shafts 871 on this side. The dual positioning method of mechanical limit and magnetic adsorption can not only ensure the axial stability of the internal plug-in during operation, but also prevent it from moving or vibrating under fluid impact. There is no need to use bolts or other fasteners, and the installation and disassembly operations are simple and quick, greatly improving the loading and unloading efficiency.

[0037] After the installation of the positioning plate 81 on one side is completed, the above steps can be repeated to complete the installation of the positioning plate 81 on the other side, ensuring that the positioning plates 81 and sealing plates 82 on both sides are locked and positioned with the corresponding mounting shafts 871 on each side. Then, the operator can fix the left and right end caps 3 to the left and right ends of the pipe shell 1 respectively using flange bolts, and fix the output end of the electric push rod 86 to the connecting frame 85 in the middle of the corresponding sealing plate 82. Then, according to the design flow rate requirements of the actual working conditions, the corresponding connecting frame 85 is controlled in advance by the left and right electric push rods 86, which drives the corresponding positioning plate 81 and sealing plate 82 to move axially synchronously. Adjusting the axial spacing between each pair of left and right support tubes 71 adjusts the spiral tilt angle and pre-tightening degree of the elastic baffles 741 inside several heat exchange tubes 5. During this process, several limiting slide rods 811 on the positioning plate 81 will adaptively slide along the inner wall of the corresponding guide groove 42. It should be noted that when the spacing between the left and right positioning plates 81 is controlled by the electric push rods 86 on both sides, the outer wall of the positioning plate 81 and the inner wall of the end cap 3 always maintain a sufficient distance, leaving enough space for the medium to flow smoothly, reducing the resistance when pushing the positioning plate 81 to move. The medium that enters the receiving tank through the perforation 83 can also be discharged into the end cap 3 through the drain hole 812, without causing liquid accumulation and corrosion problems.

[0038] It is worth emphasizing that for heat exchangers that operate under low flow rate conditions for extended periods, the distance between the two support tubes 71 can be reduced by controlling the two electric push rods 86 on the left and right sides, thereby increasing the spiral tilt angle of the elastic baffle 741 and enhancing the turbulence enhancement effect. For heat exchangers that operate under medium to high flow rate conditions for extended periods, the distance between the two support tubes 71 can be increased by controlling the two electric push rods 86 on the left and right sides, thereby decreasing the spiral tilt angle of the elastic baffle 741 and reducing flow resistance. This achieves pre-adjustment for different operating conditions. Combined with the real-time adaptive deformation function of the elastic baffle 741, a dual adjustment mechanism of pre-adjustment and self-adaptation is formed, which completely solves the problem that existing internal inserts cannot simultaneously address turbulence enhancement and flow resistance control under wide flow rate conditions, enabling the heat exchanger to maintain optimal heat exchange efficiency and flow resistance ratio across different flow rate ranges.

[0039] Specifically, in the low-flow-rate heat exchange operation stage, which is the normal operating state of the heat exchanger under low-flow-rate conditions, the tube-side fluid is first introduced from the tube-side inlet of the left end cap 3, enters the heat exchange tube 5 through the flow hole 73 on the support tube 71, and then is discharged from the tube-side outlet of the right end cap 3. The flow hole 73 on the support tube 71 can ensure smooth flow of the tube-side fluid and avoid blockage of the fluid inlet by the internal insert. At the same time, the shell-side fluid is introduced from the shell-side inlet of the shell 1, and flows in an S-shape along the inner wall of the shell 1 under the guidance of the baffle 6, exchanging heat with the tube-side fluid, and then is discharged from the shell-side outlet of the shell 1. The staggered baffle 6 makes the shell-side fluid form strong turbulence, improving the shell-side heat transfer coefficient.

[0040] When the tube-side fluid flows through the elastic baffle 741, under low flow rate conditions, the impact force of the tube-side fluid on the elastic baffle 741 is small, and the elastic limiting rope 742 will be in a relaxed state, completely not restricting the deployment of the elastic baffle 741. The elastic baffle 741 maintains the pre-adjusted maximum spiral deployment state, and its spiral structure can fully contact the fluid, causing the fluid to generate strong vortices and secondary flows, effectively breaking the stable laminar boundary layer on the inner wall of the heat exchange tube 5. This avoids the problem that the smooth inner wall of the heat exchange tube 5 cannot break the laminar boundary layer at low flow rates, and the thermal resistance disadvantage of the fluorine coating is amplified.

[0041] In the adaptive adjustment heat exchange operation stage under medium-high flow rate conditions, this stage is the adaptive operation state of the heat exchanger under medium-high flow rate conditions. As the flow rate of the fluid in the tube increases until it reaches the preset threshold, the distance between the two support tubes 71 can be increased by the two electric push rods 86 on the left and right, reducing the spiral tilt angle of the elastic baffle 741 and reducing the flow resistance. At this time, the elastic limiting rope 742 will be gradually straightened, and the elastic limiting rope 742 and the elastic baffle 741 can jointly resist the fluid impact force. When the flow rate reaches the design maximum value, the elastic baffle 741 will be squeezed towards the axis of the heat exchange tube 5, and the elastic limiting rope 742 will be completely straightened, limiting the further deformation of the elastic baffle 741.

[0042] Furthermore, the combination of the elastic baffle strip 741 and the elastic limiting rope 742 can effectively absorb the vibration energy generated by fluid pulsation, reduce the overall vibration amplitude of the internal component, and further reduce the contact pressure between the ball 72 and the inner wall of the heat exchange tube 5, thereby better protecting the fluorine coating on the heat exchange tube 5. The deformed elastic baffle strip 741 can still generate sufficient turbulence in the fluid, continuously breaking the laminar boundary layer and ensuring heat exchange efficiency. At the same time, in this state, the dual positioning method of magnetic adsorption and mechanical limiting of the installation positioning group 87 can ensure the axial stability of the enhanced turbulence section 7 under the impact of high-velocity fluid, preventing it from moving or vibrating, which could lead to wear of the fluorine coating or a decrease in the heat exchange enhancement effect.

[0043] During the shutdown maintenance and internal component replacement phase, first, shut down the heat exchanger and drain the internal medium. Remove the left and right end caps 3, disconnect the connection between the output end of the electric push rod 86 and the connecting frame 85, and then the operator rotates each mounting shaft 871 on both sides by 90 degrees to realign the magnetic lug 872 with the corresponding alignment hole 84. At this time, the magnetic lug 872 can be withdrawn from the alignment hole 84, completing the centralized unlocking of several internal components. Then, pull out the left and right positioning plates 81 in sequence away from the tube sheet 4 to remove several internal components from the corresponding heat exchange tube 5 as a whole. If only a single internal component needs to be inspected, maintained, or replaced, simply rotate several mounting shafts 871 on one side by 90 degrees to realign the magnetic lug 872 with the corresponding alignment hole 84. The corresponding alignment holes 84 are realigned. At this time, the magnetic lug 872 can be removed from the alignment holes 84. Then, the positioning plate 81 on this side is pulled out away from the tube sheet 4. Then, the inner plug that needs to be inspected, maintained and replaced is rotated 90 degrees synchronously with the mounting shaft 871 on the other side, so that the magnetic lug 872 is realigned with the corresponding alignment hole 84. At this time, the magnetic lug 872 can also be removed from the alignment hole 84, and the inner plug can be pulled out smoothly. This achieves the individual unlocking of the corresponding inner plug in a single heat exchange tube 5. In addition, if only the elastic turbulence strip 741 or the elastic limiting rope 742 is damaged, it is not necessary to replace the entire enhanced turbulence section 7. Only the damaged part needs to be replaced. Moreover, the through-type matching design of the two makes the replacement operation more convenient.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fluoropolymer-coated steel heat exchanger with a reinforced turbulent flow internal insert structure, characterized in that, include: A tube shell (1) with a base (2) is fixedly fitted on the outer wall. End caps (3) are installed on both the left and right ends of the tube shell (1). Tube plates (4) are symmetrically installed on the inner wall of the tube shell (1). Heat exchange tubes (5) are installed through the two tube plates (4). Several heat exchange tubes (5) are installed. The heat exchange tubes (5) are symmetrically distributed in two groups. Baffles (6) are symmetrically slidably fitted on the outer wall of each group of heat exchange tubes (5). A turbulence enhancement section (7) is provided inside the heat exchange tubes (5). An installation adjustment section (8) is provided on both the tube shell (1) and the turbulence enhancement section (7). The enhanced turbulence section (7) includes support tubes (71) symmetrically arranged on the inner wall of the heat exchange tube (5). The support tubes (71) are hollow tube structures with rounded corners at both ends. Several sets of evenly distributed circumferential balls (72) are embedded on the outer wall of the support tubes (71). Several evenly distributed circumferential flow holes (73) are opened on the outer wall of the support tubes (71) located outside the heat exchange tube (5). Turbulence groups (74) are provided on both the left and right support tubes (71). The installation adjustment part (8) includes a positioning plate (81) located inside the left and right end caps (3). The end of the positioning plate (81) away from the tube plate (4) is provided with a receiving groove. A sealing plate (82) is installed on the inner wall of the receiving groove. An installation positioning group (87) is provided on the support tube (71) and the sealing plate (82).

2. A fluorine-coated steel heat exchanger with a reinforced turbulent flow internal insert structure according to claim 1, characterized in that: The two upper baffles (6) and the two lower baffles (6) are evenly distributed in an alternating manner, and the outer wall of the baffles (6) is fixedly connected to the inner wall of the tube shell (1). Each set of balls (72) consists of several balls (72) that are evenly distributed in a linear manner. The balls (72) roll and contact the inner wall of the heat exchange tube (5).

3. A fluorine-coated steel heat exchanger with a reinforced turbulent internal insert structure according to claim 1, characterized in that: The installation adjustment part (8) also includes through holes (83) on the positioning plate (81) and the sealing plate (82) that are common to several support tubes (71). The positioning plate (81) near the tube plate (4) is provided with alignment holes (84) for several support tubes (71). The alignment holes (84) are waist-shaped and connected to the corresponding through holes (83). A connecting frame (85) is installed in the middle of the end of the sealing plate (82) away from the tube plate (4). The connecting frame (85) is composed of a waist-shaped plate and a round rod. An electric push rod (86) for driving the connecting frame (85) to move back and forth is installed through the end of the end cap (3) away from the tube shell (1).

4. A fluoropolymer-coated steel heat exchanger with a reinforced turbulent flow internal insert structure according to claim 3, characterized in that: Several rectangular and evenly distributed support rods (41) are installed through the two tube sheets (4) on the left and right sides. Guide grooves (42) are provided at both ends of the support rods (41). Limiting slide rods (811) are installed on the end of the positioning plate (81) near the tube sheet (4) for each of the support rods (41). The outer wall of the limiting slide rod (811) is slidably connected to the inner wall of the corresponding guide groove (42).

5. A fluorine-coated steel heat exchanger with a reinforced turbulent flow internal insert structure according to claim 1, characterized in that: The turbulence group (74) includes an elastic turbulence strip (741) installed at the opposite ends of the left and right support tubes (71). Several elastic limiting ropes (742) evenly distributed in a circle are also installed at the opposite ends of the left and right support tubes (71). The elastic limiting ropes (742) slide through the elastic turbulence strip (741).

6. A fluoropolymer-coated steel heat exchanger with a reinforced turbulent flow internal insert structure according to claim 3, characterized in that: The installation positioning assembly (87) includes an installation shaft (871) that is rotatably installed at one end of the support tube (71) near the positioning plate (81). The outer wall of the installation shaft (871) is movably attached to the inner wall of the corresponding through hole (83), and the outer wall of the installation shaft (871) is symmetrically provided with installation grooves on the upper and lower sides corresponding to the positioning insertion hole (84). Magnetic ear seat (872) is slidably installed on the inner wall of the installation groove by means of a compression spring.

7. A fluoropolymer-coated steel heat exchanger with a reinforced turbulent flow internal insert structure according to claim 6, characterized in that: The installation positioning group (87) also includes a positioning magnet (873) embedded on the sealing plate (82), and a number of positioning magnets (873) are embedded. The number of positioning magnets (873) are evenly distributed from top to bottom and correspond one-to-one with each row of heat exchange tubes (5). A circular notch is opened on each of the corresponding perforations (83) on the positioning magnet (873).

8. A fluoropolymer-coated steel heat exchanger with a reinforced turbulent internal insert structure according to claim 4, characterized in that: The lower side of the outer wall of the positioning plate (81) is provided with a number of drainage holes (812) that are evenly distributed in a circle, and the drainage holes (812) are connected to the corresponding receiving grooves.

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