Reinforcing structure for directly-buried hot water heat preservation pipeline joint

Abstract

The invention relates to the technical field of heat preservation pipeline joint machining, and particularly discloses a directly-buried hot water heat preservation pipeline joint reinforcing structure which comprises a welding seam formed by welding two heat pipe ports. The outer pipe bodies are inserted into the ports of the two ends of the sleevelet respectively, the heat pipes penetrate through the axes of the outer pipe bodies and are distributed in the middle to form a cavity, and a polyurethane filling part is arranged in the cavity; the end opening of the pipe clamping piece is connected in an inserted mode to form a pipe hoop, and the pipe clamping piece covers the sleeve and the outer pipe body respectively; the viscoelastic body waterproof adhesive tape surrounding part is formed by surrounding one outer pipe body to the other outer pipe body; and the photocuring film coiled material is sleeved on the outer side of the surrounding part of the viscoelastic body waterproof adhesive tape. The viscoelastic body waterproof adhesive tape surrounding part and the light-cured film coiled material are fully utilized, so that the toughness and the elongation at break obtained by the welding seam are larger than those of a heat preservation pipeline working pipe, and the reinforced combined structure can bear pipeline force.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation pipe joint processing, and in particular to a directly buried hot water thermal insulation pipe joint reinforcement structure. Background Art

[0002] Urban heating pipe networks generally use prefabricated direct-buried hot water insulation pipes (hereinafter referred to as insulation pipes), which are composed of high-density polyethylene outer protective pipes (hereinafter referred to as outer protective pipes), rigid polyurethane foam plastic insulation layers (hereinafter referred to as insulation layers), and working steel pipes. The insulation pipes are prefabricated in factories, and the quality is relatively easy to guarantee, while the joint insulation is completed at the construction site. Affected by the joint materials and on-site construction conditions, the joint insulation quality is lower than that of prefabricated insulation pipes, becoming the weak link of the heating pipe network system. Although national specifications such as "High-density polyethylene outer protective pipe rigid polyurethane foam plastic prefabricated direct-buried insulation pipes and pipe fittings" GB / T29047-2012 and "Technical conditions for insulation of joints of urban heating direct-buried pipelines" GB / T38585-2020 have clear provisions on the process and test requirements for joint insulation, a large number of domestic engineering practices have proved that more than 80% of the failures of direct-buried hot water pipe networks are caused by defects in joint insulation quality, which have caused many pipe network safety accidents and caused very bad social impacts. Therefore, improving the quality level of my country's insulated pipe network joints is of great significance to improving the safety and reliability of the heating pipe network, reducing the incidence of pipe network accidents, and saving energy and reducing consumption. According to GB / T38585-2020, the joint insulation methods are: Heat shrinkable tape joint, a joint structure consisting of a high-density polyethylene outer sheath, a heat shrinkable tape and an insulation layer; Electric fusion welding joint, a joint structure consisting of a high-density polyethylene outer sheath, an electric thermal fuse and an insulation layer; Heat shrinkable joint, a joint structure consisting of a heat shrink sleeve, sealant and insulation layer.

[0003] Based on the historical practice results of the above three construction methods, when the above-mentioned joint structure is in an area with a high groundwater level, once the insulation of the joint is damaged, groundwater enters the insulation layer. Under the action of high temperature, the polyurethane hydrolyzes and carbonizes and gradually disappears. The working steel pipe gradually corrodes after contacting with the groundwater, causing the working steel pipe to leak or burst. Summary of the invention

[0004] The purpose of the present invention is to provide a directly buried hot water insulation pipe joint reinforcement structure for solving the above-mentioned problems.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: A directly buried hot water insulation pipe joint reinforcement structure, comprising: The weld formed by welding two heat pipe ports; The outer tube bodies are respectively inserted into the ports at both ends of the sleeve at a predetermined depth, and the heat pipe passes through the axis of the outer tube body and is centrally distributed to form a cavity, and a polyurethane filling part is arranged in the cavity; A pipe clamp for connecting the ports to form a pipe clamp, the pipe clamp covering the sleeve and the outer pipe body respectively; A viscoelastic waterproof tape surrounding portion formed by one outer tube surrounding another outer tube; A light-curing film coil is sleeved on the outer side of the viscoelastic waterproof tape surrounding portion.

[0006] Preferably, the portion of the tube clamp covering the outer tube body is an outer extension portion, and the portion covering the sleeve is an inner extension portion.

[0007] Preferably, it also includes a glass fiber reinforced plastic arranged on the outer tube body covered by the extension portion, and the axial length of the glass fiber reinforced plastic is not less than half of the axial length of the extension portion.

[0008] Preferably, a filling piece is plugged into one end of the inner extension, and the filling piece has a filling port; The inner wall of the inner extension portion is provided with a plurality of drainage streams arranged in a circumferential array, and the plurality of drainage streams are connected to the injection ports provided on the pouring piece in a one-to-one correspondence; The port of the drainage ravine faces the sleeve.

[0009] Preferably, a blocking plate is fixedly provided inside the outlet of the injection port, and the outer wall of the blocking plate maintains a predetermined distance from the inner wall of the injection port to form an overflow annular channel.

[0010] Preferably, a movable portion is slidably provided in the drainage stream, and in a default state, the movable portion is attached to an inner wall of one side of the drainage stream, so that a cavity is formed in the drainage stream, and the injection port is located in the cavity.

[0011] Preferably, the inner walls on opposite sides of the cavity are symmetrically provided with arc-shaped receiving brackets and arched flow guides; The arc-shaped receiving tray is used to receive the glue injected from the injection port; The arched guide member is used to guide the glue liquid overflowing from the arc-shaped receiving tray; The moving part is provided with an arc-shaped groove arranged toward the arched flow guide member.

[0012] Preferably, a through hole is provided on the moving part, and a circular retaining cavity is provided on the through hole.

[0013] Preferably, when the moving part enters the cavity, a piston cavity is formed in the drainage stream; A cover plate covering the piston cavity is arranged on the port of the drainage stream, and a plurality of rectangular frame holes arranged at equal intervals are opened on the cover plate.

[0014] Preferably, the tube clamp is located at the junction of the outer tube body and the sleeve and has an annular groove, in which a first viscoelastic paste is arranged; The light-curing film coil is located at the tube clamp and is combined with the outer tube body and has an annular groove, in which a second viscoelastic paste is arranged.

[0015] In the above technical scheme, a direct-buried hot water insulation pipe joint reinforcement structure provided by the present invention has the following beneficial effects: by utilizing a sleeve and an outer tube body to form an outer ring tube, two heat pipes welded together are sleeved, and then polyurethane is injected to form a polyurethane filling part, and the heat pipe is located in the sleeve and the outer tube body and centered, thereby achieving insulation of the heat pipe.

[0016] Secondly, pipe clamps are respectively clamped on the sleeve and the outer tube body to form two symmetrically arranged pipe clamps, thereby strengthening the bonding strength between the sleeve and the outer tube body, and then the viscoelastic waterproof tape is wrapped around it to form a viscoelastic waterproof tape wrapping part with a predetermined axial length and thickness. After completion, the photocurable film roll is put on for curing to form an outer protective layer with high mechanical properties, which provides excellent resistance to mechanical damage, protects the viscoelastic waterproof tape, and also plays a role in protecting the entire joint insulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the overall cross-sectional structure provided by an embodiment of the present invention; Figure 2 A schematic cross-sectional structure diagram of a pipe clamp provided in an embodiment of the present invention; Figure 3 A schematic diagram of the internal structure of a drainage stream cross section provided by an embodiment of the present invention; Figure 4 A schematic cross-sectional structure diagram of a potting piece provided in an embodiment of the present invention.

[0019] Description of reference numerals: 1. Heat pipe; 11. Welding seam; 2. Sleeve; 3. Outer tube body; 4. Polyurethane filling part; 5. Pipe clamp; 51. Outer extension; 52. Inner extension; 53. Drainage stream; 54. Filling piece; 541. Filling port; 542. Injection port; 55. Blocking piece; 56. Moving part; 561. Arc groove; 562. Through hole; 563. Circular retaining cavity; 57. Arc receiving support; 58. Arched guide piece; 59. Cover plate; 591. Rectangular frame hole; 6. Viscoelastic waterproof tape surrounding part; 7. Photocurable film roll; 8. Glass fiber reinforced plastic. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-4 As shown, a directly buried hot water insulation pipe joint reinforcement structure comprises: A weld 11 formed by welding two ends of the heat pipe 1; The outer tube body 3 is respectively inserted into the ports at both ends of the sleeve 2 at a predetermined depth, and the heat pipe 1 passes through the axis of the outer tube body 3 and is centrally distributed to form a cavity, in which a polyurethane filling part 4 is arranged; The ports are plugged to form a pipe clamp 5 for forming a pipe hoop, and the pipe clamp 5 covers the sleeve 2 and the outer tube body 3 respectively; A viscoelastic waterproof tape surrounding portion 6 formed by one outer tube 3 surrounding another outer tube 3; A light-curing film coil 7 is sleeved on the outer side of the viscoelastic waterproof tape surrounding portion 6 .

[0022] Specifically, the joint surfaces of the two pipe clamps 5 constituting a pipe clamp in the embodiment are plug-in matched, that is, the joint surface of one pipe clamp 5 is a groove, and the joint surface of the other pipe clamp 5 is provided with a protrusion that can be tenoned into the groove. The portion of the pipe clamp 5 covering the outer tube body 3 is the outer extension 51, and the portion covering the sleeve 2 is the inner extension 52. A predetermined distance is maintained between the two pipe clamps, and the weld 11 corresponds to the center of the distance between the two pipe clamps 5.

[0023] Furthermore, the thickness of the viscoelastic waterproof tape surrounding portion 6 formed by the viscoelastic waterproof tape in the embodiment is 1.8 mm, and the thickness of the light-curing film coil 7 formed by the light-curing film is 2 mm. After the light-curing film coil 7 is covered, it needs to react quickly under ultraviolet light or natural light, and becomes hard and smooth in 20-30 minutes, making on-site construction possible.

[0024] In the above technology, the outer ring tube is formed by utilizing the sleeve 2 and the outer tube body 3 to sleeve the two heat pipes 1 welded together, and then polyurethane is injected to form a polyurethane filling part 4, and the heat pipe 1 is located inside the sleeve 2 and the outer tube body 3 and centered, thereby achieving heat insulation of the heat pipe 1.

[0025] Secondly, pipe clamps 5 are respectively clamped on the sleeve 2 and the outer tube body 3 to form two symmetrically arranged pipe clamps, thereby strengthening the bonding strength between the sleeve 2 and the outer tube body 3, and then the viscoelastic waterproof tape is wrapped around to form a viscoelastic waterproof tape wrapping portion 6 of a predetermined axial length and thickness. After completion, the photocurable film coil 7 is put on for curing to form an outer protective layer with higher mechanical properties, which provides excellent resistance to mechanical damage, protects the viscoelastic waterproof tape, and also plays a role in protecting the entire joint insulation.

[0026] As a further embodiment provided by the present invention, based on the above embodiment, it also includes a glass fiber reinforced plastic 8 arranged on the outer tube body 3 covered by the extension portion 51, and the axial length of the glass fiber reinforced plastic 8 is not less than half of the axial length of the extension portion 51.

[0027] Specifically, the FRP 8 in the embodiment is only arranged on one of the heat pipes 1, that is, it is arranged downstream of the flow direction of the extended transmission medium. By arranging the FRP 8 downstream of the heat pipe, the heat transfer characteristics of the heat pipe 1 can be effectively utilized to enhance the thermal management effect of the downstream area. When the heat pipe 1 is working, it will conduct heat from the heat source to the cooling area, and the material arranged downstream can better absorb and dissipate the heat. The FRP 8 has good thermal conductivity and mechanical strength. When placed downstream of the heat pipe 1, it can give full play to its material properties and enhance the overall heat conduction efficiency and structural stability. It can also help reduce the temperature gradient inside the system and avoid material fatigue or damage caused by excessive temperature differences, thereby improving the reliability and service life of the pipeline. As another embodiment further provided by the present invention, a filling piece 54 is inserted into one end of the inner extension 52, and the filling piece 54 has a filling port 541; The inner wall of the inner extension portion 52 is provided with a plurality of drainage streams 53 arranged in a circumferential array, and the plurality of drainage streams 53 are connected to the injection ports 542 provided on the injection member 54 in a one-to-one correspondence; The end of the drainage ravine 53 faces the sleeve 2 .

[0028] Specifically, the liquid filled into the filling port 541 in the above embodiment is any one of silicone glue, acrylic glue or epoxy resin glue.

[0029] Furthermore, during construction, a pouring piece 54 is inserted into a port at one end of the inner extension 52 relative to the outer extension 51 . The pouring piece 54 is an arc-shaped structure and a hollow structure. The liquid injected from the filling port 541 will enter the hollow structure and then be injected into each corresponding drainage stream 53 from the injection port 542 .

[0030] Secondly, the pipe clamp 5 and the injection molding part 54 in the embodiment can be metal parts connected by welding, or injection molding parts formed into one piece by hot melting.

[0031] Furthermore, the drainage ravine 53 in the embodiment is spiral and has one thread, and the pitch length is equal to the axial length of the inner extension 52. Thus, the flow rate of the injected liquid can be accelerated, and after the liquid in the spiral drainage ravine 53 solidifies, the sleeve 2 and the outer tube body 3 are integrated. Moreover, because there are multiple drainage ravines 53, a stronger damping force can be provided to prevent the pipe clamp from loosening during the subsequent pipeline transportation, thereby increasing the fit of the above structure.

[0032] As another embodiment further provided by the present invention, a blocking plate 55 is fixedly disposed inside the outlet of the injection port 542, and the outer wall of the blocking plate 55 maintains a predetermined distance from the inner wall of the injection port 542 to form an overflow annular channel.

[0033] Specifically, the blocking piece 55 is cleverly designed to include a horizontal portion and an outer inclined portion, and the whole is a circular structure. This design not only enhances its structural stability, but also cleverly utilizes physical principles to achieve specific functions. The blocking piece 55 is firmly fixed in the injection port 542 through the extension portion on its inclined portion, ensuring its stable position during the injection process.

[0034] When the liquid begins to be injected into the filling piece 54, as the liquid level gradually rises, the liquid will first encounter the barrier sheet 55. At this time, the horizontal portion of the barrier sheet 55 plays a major blocking role. Since the horizontal portion is perpendicular (or nearly perpendicular) to the liquid surface, it forms an effective barrier to prevent the liquid from flowing further without hindrance. When the liquid rushes to the barrier sheet 55, its kinetic energy will be consumed in large quantities on the contact surface with the barrier sheet 55. At the same time, due to the material and shape design of the barrier sheet 55, it can provide a relatively large resistance surface for the liquid, making it difficult for the liquid to break through.

[0035] In addition, the design of the inclined surface also plays a key role. It not only increases the contact area between the blocking sheet 55 and the inner wall of the injection port 542, improving the stability of the fixation, but also guides the flow direction of the liquid to a certain extent. When the liquid tries to bypass the horizontal part, the inclined surface will force it to change the flow path, further increasing the difficulty of the liquid breaking through the obstruction.

[0036] When the filling member 54 is not filled with liquid, the liquid cannot break through the barrier 55 and continue to flow because the pressure and kinetic energy of the liquid are not enough to overcome the blocking effect of the barrier 55. Only when the filling member 54 is completely filled, as the filling continues, the internal pressure gradually increases to a level sufficient to overcome the resistance of the barrier 55, and the multiple injection ports 542 will discharge liquid at the same time, thus achieving simultaneous filling of the multiple drainage gullies 53. This not only improves the efficiency and accuracy of the filling, but also ensures the stability and controllability of the filling process.

[0037] As another embodiment further provided by the present invention, a movable portion 56 is slidably provided in the drainage stream 53. In a default state, the movable portion 56 is attached to the inner wall of one side of the drainage stream 53, so that a cavity is formed in the drainage stream 53, and the injection port 542 is located in the cavity.

[0038] Specific, combined Figure 3 As shown, the inner wall shown on the left side of the drainage stream 53 in the embodiment is a, and the inner wall shown on the right side is b, and the cavities are distributed near b. In the embodiment, when liquid is injected into the drainage stream 53 from the injection port 542, as the liquid contacts the moving part 56, after reaching a predetermined volume, the liquid tension will actively pull the moving part 56 so that the moving part 56 switches from the state of being in contact with a to the state of being in contact with b, thereby squeezing the liquid out of the drainage stream 53.

[0039] As the moving part 56 is squeezed and fits to part b under tension, the liquid will quickly migrate due to the squeezing, thereby covering the entire moving part 56. During the process, it will also be actively sucked due to the rapid migration, thereby accelerating the injection of liquid from the filling piece 54 into the drainage stream 53, and finally switching from passive suction to active suction.

[0040] As another embodiment further provided by the present invention, arc-shaped receiving brackets 57 and arched flow guides 58 are symmetrically arranged on the inner walls of opposite sides of the cavity; The arc-shaped receiving tray 57 is used to receive the glue injected from the injection port 542; The arched guide member 58 is used to guide the glue liquid overflowing from the arc-shaped receiving tray 57; The moving portion 56 is provided with an arc-shaped groove 561 arranged toward the arched flow guide 58 .

[0041] Specifically, the liquid injected from the injection port 542 in the embodiment will first enter the arc-shaped receiving support 57, and the outer arc top of the arched flow guide 58 faces the end of the arc-shaped receiving support 57, so when the liquid accumulated in the arc-shaped receiving support 57 reaches a predetermined amount, it will overflow and contact the arched flow guide 58, and a water film will be generated at the moment of contact, caused by the tension of the liquid. Because the drainage ravine 53 is spiral, that is, the arc-shaped receiving support 57 and the arched flow guide 58 are also consistent with the outer contour of the drainage ravine 53, so after the water film is formed, it will fill the gap along the arc-shaped receiving support 57 and the arched flow guide 58. To produce a suction effect, thereby accelerating the speed at which the liquid in the injection piece 54 is injected into the drainage stream 53, until the water film can no longer bear the pressure of the liquid and it overflows, then flows along the arched guide piece 58 and enters the arcuate groove 561. When the liquid enters the arcuate groove 561, it quickly fills the arcuate groove 561, and the speed of liquid replenishment cannot be faster than the filling speed, so the moving part 56 will be moved toward b under tension, and the end of the arched guide piece 58 will be embedded in the arcuate groove 561.

[0042] As another embodiment further provided by the present invention, a completely through hole 562 is formed on the moving portion 56 , and a circular retaining cavity 563 is formed on the through hole 562 .

[0043] Furthermore, when the moving part 56 enters the cavity, a piston cavity is formed in the drainage stream 53; A cover plate 59 for covering the piston cavity is provided on the port of the drainage stream 53 , and a plurality of rectangular frame holes 591 arranged at equal intervals are provided on the cover plate 59 .

[0044] Specifically, in the embodiment, when the moving portion 56 is moved toward direction b under tension, the liquid will be squeezed into the through hole 562 as the volume of the cavity decreases.

[0045] Secondly, the piston chamber in the embodiment is on the side of the drainage stream 53 where a is located. In the default state, the movable part 56 is attached to a, and when the movable part 56 moves toward b under tension, the piston chamber space begins to increase. At the moment of movement, the external gas cannot be quickly replenished, so a suction force is formed, thereby quickly sucking liquid through the through hole 562 to replenish the piston chamber during the volume change process.

[0046] The ports of the drainage gully 53 in the embodiment are fitted on the outer wall of the outer tube body 3 and the sleeve 2 , so at the moment of movement, the external gas cannot be quickly replenished and can only be compensated through the through hole 562 .

[0047] Furthermore, the cover plate 59 in the embodiment prevents the movable portion 56 from escaping from the drainage ravine 53 , and the liquid in the piston chamber will also fill the rectangular frame hole 591 under gravity or when it is full, thereby contacting the outer tube body 3 and the outer wall of the sleeve 2 .

[0048] As another embodiment further provided by the present invention, the tube clamp 5 is located at the junction of the outer tube body 3 and the sleeve 2 and has an annular groove, and a first viscoelastic paste 8 is arranged in the annular groove; The light-curing film coil 7 is located where the tube clamp 5 is combined with the outer tube body 3 and has an annular groove, in which the second viscoelastic paste 9 is arranged.

[0049] Specifically, the second viscoelastic paste 9 and the first viscoelastic paste 8 in the embodiment can eliminate gaps and provide bonding effects. It should be noted that the viscoelastic paste can prevent the penetration of water and water vapor, and prevent the erosion of corrosive substances such as acids and alkalis.

[0050] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A directly buried hot water insulation pipe joint reinforcement structure, characterized in that: include: A weld (11) formed by welding the ends of two heat pipes (1); The outer tube bodies (3) are respectively inserted into the ports at both ends of the sleeve (2) at a predetermined depth, and the heat pipe (1) passes through the axis of the outer tube body (3) and is centrally distributed to form a cavity, wherein a polyurethane filling portion (4) is provided in the cavity; A pipe clamp (5) for forming a pipe clamp by plugging the ports, the pipe clamp (5) respectively covering the sleeve (2) and the outer pipe body (3); A viscoelastic waterproof tape surrounding portion (6) formed by one outer tube (3) surrounding another outer tube (3); A light-curing film coil (7) sleeved on the outside of the viscoelastic waterproof tape surrounding portion (6); The portion of the tube clamp (5) covering the outer tube body (3) is the outer extension portion (51), and the portion covering the sleeve (2) is the inner extension portion (52); The inner wall of the inner extension portion (52) is provided with a plurality of drainage streams (53) arranged in a circumferential array, and a movable portion (56) is slidably arranged in the drainage stream (53). In a default state, the movable portion (56) is attached to the inner wall of one side of the drainage stream (53), so that a cavity is formed in the drainage stream (53), and the injection port (542) is located in the cavity.

2. A direct buried hot water insulation pipe joint reinforcement structure according to claim 1, characterized in that: It also includes a glass fiber reinforced plastic (8) arranged on the outer tube body (3) covered by the outer extension (51), wherein the axial length of the glass fiber reinforced plastic (8) is not less than half of the axial length of the outer extension (51).

3. A direct buried hot water insulation pipe joint reinforcement structure according to claim 1, characterized in that: A filling piece (54) is inserted into one end of the inner extension (52), and the filling piece (54) has a filling port (541); The plurality of drainage streams (53) are connected in a one-to-one correspondence with the injection ports (542) provided on the injection member (54); The port of the drainage ravine (53) faces the sleeve (2).

4. A direct buried hot water insulation pipe joint reinforcement structure according to claim 3, characterized in that: A blocking sheet (55) is fixedly arranged inside the outlet of the injection port (542), and the outer wall of the blocking sheet (55) maintains a predetermined distance from the inner wall of the injection port (542) to form an overflow annular channel.

5. A direct buried hot water insulation pipe joint reinforcement structure according to claim 1, characterized in that: The inner walls on opposite sides of the cavity are symmetrically provided with arc-shaped receiving brackets (57) and arched flow guides (58); The arc-shaped receiving tray (57) is used to receive the glue injected from the injection port (542); The arched guide member (58) is used to guide the glue liquid overflowing from the arc-shaped receiving tray (57); The movable portion (56) is provided with an arc-shaped groove (561) arranged towards the arched flow guide member (58).

6. A directly buried hot water insulation pipe joint reinforcement structure according to claim 1, characterized in that: The movable portion (56) is provided with a completely continuous through hole (562), and the through hole (562) is provided with a circular retaining cavity (563).

7. A direct buried hot water insulation pipe joint reinforcement structure according to claim 1, characterized in that: When the moving part (56) enters the cavity, a piston cavity is formed in the drainage stream (53); A cover plate (59) covering the piston chamber is provided on the port of the drainage stream (53), and a plurality of rectangular frame holes (591) arranged at equal intervals are provided on the cover plate (59).

8. A direct buried hot water insulation pipe joint reinforcement structure according to claim 1, characterized in that: The tube clamp (5) is located at the junction of the outer tube body (3) and the sleeve (2) and has an annular groove, in which a first viscoelastic paste (8) is arranged; The light-curing film coil (7) is located at the junction of the tube clamp (5) and the outer tube body (3) and has an annular groove, in which a second viscoelastic paste (9) is arranged.

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