A tensioning mechanism for an underwater electrical device and an underwater electrical device

Abstract

The application relates to a tensioning mechanism of an underwater electrical equipment and the underwater electrical equipment, and belongs to the technical field of underwater electrical equipment, which comprises a half joint, the half joint comprising two half-arc-shaped shells that are opposite and form an internal cavity; a tensioning assembly, the tensioning assembly comprising a double-end screw rod located between the two half-arc-shaped shells and having opposite threads at two ends, the double-end screw rod being threadedly connected with a nut sleeve at each end, and each nut sleeve being hingedly provided with a supporting rod between the half-arc-shaped shell. Therefore, the two nut sleeves can be driven to move close to or away from each other by rotating the double-end screw rod; when the nut sleeves move close to each other, the two half-arc-shaped shells are driven to move away from each other by the supporting rods, so that the half joint is opened to realize tensioning of the pressure-bearing cylinder. The tensioning assembly occupies a small space, is installed in a hinged mode, has a simple structure, high space utilization rate and low assembly difficulty. The self-locking property of the double-end screw rod can realize stable rigid tensioning of the pressure-bearing cylinder.

Description

Technical Field

[0001] This application relates to the field of underwater electrical equipment technology, and in particular to a tensioning mechanism for underwater electrical equipment and underwater electrical equipment. Background Technology

[0002] As underwater communication equipment develops towards larger capacity and higher speed, the power consumption of the equipment continues to increase. However, due to the limitations of construction and deployment processes, the size of the equipment cannot be increased accordingly. Therefore, it is urgent to improve the heat dissipation capacity without changing the size, so as to ensure the reliability of the equipment in long-term operation for 25 years.

[0003] Among related technologies, patent CN207457574U provides a structure for achieving tension between the internal structural components and the inner wall of the cylinder. This structure includes an internal support component and a connecting component composed of two semi-circular arc-shaped shells (half-joints). The connecting component is equipped with a hinge component, an elastic component, and an adjusting component. The distance between the two half-joints is changed by adjusting the rotation angle of an adjusting cam on the adjusting component, thereby achieving tension between the internal structural components and the inner wall of the pressure chamber.

[0004] However, this mechanism is complex in structure, has many parts, and the elastic component, being a compression spring, results in low elastic force, requiring multiple springs. Furthermore, the co-location of the elastic and adjusting components on the same side leads to uneven tension stroke, wastes considerable space, and is difficult to assemble. Therefore, it is necessary to research and improve the above structure to provide a tensioning mechanism for underwater electrical equipment, aiming to achieve a more practical purpose. Summary of the Invention

[0005] In view of the shortcomings or deficiencies mentioned in the background art, the present application provides a tensioning mechanism for underwater electrical equipment and underwater electrical equipment to solve the problems of complex structure, low space utilization and high assembly difficulty of tensioning mechanisms in related technologies.

[0006] In a first aspect, embodiments of this application provide a tensioning mechanism for underwater electrical equipment, comprising: The half-joint comprises two opposing semi-circular arc-shaped shells that form an internal cavity; The tensioning assembly includes a double-ended screw located between the two semi-circular arc-shaped housings with opposite threads at both ends. Nut sleeves are threaded to both ends of the double-ended screw, and a support rod is hinged between each nut sleeve and the semi-circular arc-shaped housing.

[0007] In some embodiments, the number of tensioning components is two, and the two tensioning components are respectively located on both sides of the semi-circular arc-shaped shell and are arranged symmetrically.

[0008] In some embodiments, the support rod is arranged symmetrically with respect to the center of the nut sleeve and simultaneously symmetrically with respect to the center of the semi-circular housing.

[0009] In some embodiments, the double-ended screw is aligned with the length direction of the semi-circular arc-shaped housing, and both ends of the double-ended screw protrude from the semi-circular arc-shaped housing. The hinged ends of the support rod and the semi-circular arc-shaped housing are located on the two end faces of the semi-circular arc-shaped housing along its length direction.

[0010] In some embodiments, the nut sleeve and the semi-circular housing are both provided with hinge seats, and the hinge seats and the support rod are hinged by a pin; the pin passes through the hinge seats and the support rod and is provided with a fastener at its end to prevent detachment.

[0011] In some embodiments, the two semi-circular arc-shaped shells are provided with grooves for mounting optoelectronic devices on opposite sides, and the grooves are provided through the length of the semi-circular arc-shaped shells.

[0012] In some embodiments, both ends of the double-ended screw are provided with internal hexagonal slots for matching internal hexagonal wrenches.

[0013] In one aspect, in some embodiments, the nut is threadedly connected to a locking pin extending to the inside, the locking pin being used to tighten the threads of the double-ended screw.

[0014] Secondly, embodiments of this application provide an underwater electrical device, including: Pressure-bearing cylinder; The tensioning mechanism of the underwater electrical equipment described in any of the above claims is disposed within the pressure-bearing cylinder.

[0015] Secondly, in some embodiments, an insulating cylinder is provided between the pressure-bearing cylinder and the tensioning mechanism to act as a buffer / heat-conducting layer, and the tensioning mechanism tightens the insulating cylinder to make the insulating cylinder in close contact with the pressure-bearing cylinder.

[0016] The beneficial effects of the technical solution provided in this application include: This application provides a tensioning mechanism for underwater electrical equipment and underwater electrical equipment. The half-joint includes two semi-circular arc-shaped shells that meet and form an internal cavity. The tensioning assembly includes a double-ended screw located between the two semi-circular arc-shaped shells with opposite threads at both ends. Nut sleeves are threaded to both ends of the double-ended screws, and a support rod is hinged between each nut sleeve and the semi-circular arc-shaped shell.

[0017] Therefore, by rotating the double-ended screw, the two end nut sleeves can be moved closer or further apart. When the nut sleeves move closer, the support rod drives the two semi-circular shells on both sides to move away from each other, thereby opening the half-joint to achieve tensioning of the pressure-bearing cylinder. This tensioning assembly occupies little space, is installed using a hinged method, has a simple structure, high space utilization, and is easy to assemble. At the same time, the self-locking property of the double-ended screw can achieve stable rigid tensioning of the pressure-bearing cylinder, ensuring good contact between the insulating cylinder and the pressure-bearing cylinder, effectively ensuring heat dissipation, and preventing damage to the optoelectronic devices inside the half-joint due to water pressure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the tensioning mechanism according to an embodiment of this application; Figure 2 This is a schematic diagram of the tensioning component according to an embodiment of this application; Figure 3 This is a side view of the tensioning mechanism according to an embodiment of this application; Figure 4 This is a schematic diagram of the underwater electrical equipment according to an embodiment of this application.

[0020] The attached diagram lists the components represented by each number as follows: 1. Half joint; 11. Semi-circular arc shell; 12. Groove; 2. Tensioning assembly; 21. Double-ended screw; 22. Nut sleeve; 23. Support rod; 24. Hinge seat; 25. Pin; 3. Pressure-bearing cylinder; 4. Insulating cylinder. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In view of the shortcomings or deficiencies mentioned in the background art, the present application provides a tensioning mechanism for underwater electrical equipment and underwater electrical equipment to solve the problems of complex structure, low space utilization and high assembly difficulty of tensioning mechanisms in related technologies.

[0023] See Figures 1 to 4 As shown, the first aspect of this application provides a tensioning mechanism for underwater electrical equipment, comprising: Half section 1, half section 1 includes two opposing semi-circular arc-shaped shells 11 that form an internal cavity; The tensioning assembly 2 includes a double-ended screw 21 located between two semi-circular arc-shaped housings 11 with opposite threads at both ends. Nut sleeves 22 are threaded to both ends of the double-ended screw 21, and a support rod 23 is hinged between each nut sleeve 22 and the semi-circular arc-shaped housing 11.

[0024] The tensioning mechanism in this embodiment achieves precise tensioning by rotating the double-headed screw 21. The threads at both ends of the double-headed screw 21 are opposite in direction. When rotating, it can synchronously drive the nut sleeves 22 at both ends to move closer to each other. Then, through the hinged support rod 23, it evenly pushes the two semi-circular arc shells 11 on both sides to expand outward, so that the half joint 1 fits tightly against the external pressure-bearing cylinder 3.

[0025] This design fully utilizes the self-locking characteristics of the double-ended screw 21, which can reliably resist dynamic stress and equipment vibration under high pressure underwater after tightening, avoiding loosening due to water pressure fluctuations and ensuring long-term operational stability.

[0026] The tensioning assembly 2 adopts a hinged installation layout, which is highly streamlined in structure. It only requires core components such as double-headed screw 21, nut sleeve 22, and support rod 23, which greatly reduces the number of parts and significantly reduces the space occupancy rate, avoiding the multi-part arrangement and redundant space waste required by traditional spring mechanism.

[0027] Meanwhile, the assembly process eliminates the need for complex adjustment tools or high-torque operations, simplifying the process flow and reducing production costs and maintenance difficulty. By achieving uniform and tight contact between the insulating cylinder 4 and the pressure-bearing cylinder 3, heat conduction efficiency is effectively improved, ensuring the continuous and stable heat dissipation performance of underwater electrical equipment and preventing device failure due to localized overheating.

[0028] In addition, the mechanism is highly flexible in application: the tensioning component 2 can be configured on one or both sides; when a single-sided setting is used, the other side is replaced by a symmetrical hinge mechanism, which consists of two interlocking links, with both ends connected to the semi-circular housing 11. During the tensioning process, the links swing synchronously and unfold into a straight line, forming a stable rigid support structure, ensuring that the split joint 1 is firmly held in the tensioned state without the need for an additional locking device.

[0029] This design not only optimizes the spatial layout but also further enhances structural reliability, protecting internal optoelectronic devices from crushing damage under high-pressure underwater conditions, significantly extending the equipment's service life, and providing a key guarantee for the long-term high-reliability operation of underwater communication equipment.

[0030] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a tensioning mechanism for underwater electrical equipment. The tensioning mechanism of the underwater electrical equipment has two tensioning components 2, which are located on both sides of the semi-circular arc shell 11 and are arranged symmetrically.

[0031] In this embodiment, the tensioning assembly 2 is configured symmetrically on both sides, with the two tensioning assemblies 2 located on opposite sides of the semi-circular shell 11 and arranged symmetrically. This design ensures that the tensioning force is evenly applied to both sides of the split joint 1, effectively avoiding offset or deformation caused by unilateral force, ensuring comprehensive and uniform contact between the pressure-bearing cylinder 3 and the internal unit, significantly improving the stability and reliability of the tensioning process, and providing a solid guarantee for the long-term safe operation of underwater electrical equipment in underwater high-pressure environments.

[0032] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a tensioning mechanism for underwater electrical equipment. The support rod 23 of the tensioning mechanism is symmetrically arranged around the center of the nut sleeve 22 and simultaneously symmetrically arranged around the center of the semi-circular housing 11.

[0033] In this embodiment, the support rod 23 is symmetrically arranged around the center of the nut sleeve 22 and simultaneously symmetrically arranged around the center of the semi-circular arc-shaped shell 11, ensuring that the tensioning force is evenly transmitted on both sides of the split joint 1. This symmetrical design effectively avoids offset or local stress concentration caused by unilateral force, allowing the semi-circular arc-shaped shell 11 to expand smoothly during tensioning and maintain full contact with the pressure-bearing cylinder 3. This significantly improves the stability and reliability of tensioning, ensuring uniform contact and good heat dissipation of internal units under underwater high pressure, and extending the service life of underwater electrical equipment.

[0034] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a tensioning mechanism for underwater electrical equipment. The double-ended screw 21 of the tensioning mechanism is aligned with the length direction of the semi-circular arc-shaped housing 11, and both ends of the double-ended screw 21 protrude from the semi-circular arc-shaped housing 11. The hinged ends of the support rod 23 and the semi-circular arc-shaped housing 11 are located on both ends of the semi-circular arc-shaped housing 11 along its length direction.

[0035] In this embodiment, the double-ended screw 21 is strictly parallel and aligned with the semi-circular housing 11 along its length direction to ensure that the tensioning force is uniformly transmitted along the axial direction and to avoid stress concentration; the two ends of the double-ended screw 21 protrude moderately from the housing to provide sufficient space for adjustment operations, significantly improving assembly convenience and maintenance efficiency.

[0036] The hinged ends of the support rod 23 are precisely set on both ends of the shell along its length, forming symmetrical and stable hinged fulcrums. This effectively disperses the dynamic stress during the tensioning process, prevents local deformation of the shell, and ensures that the half-joint 1 maintains a tight fit for a long time under high pressure underwater, achieving reliable heat dissipation and structural stability.

[0037] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a tensioning mechanism for underwater electrical equipment. The tensioning mechanism of the underwater electrical equipment has a hinge seat 24 on both the nut sleeve 22 and the semi-circular housing 11. The hinge seat 24 and the support rod 23 are hinged by a pin 25. The pin 25 passes through the hinge seat 24 and the support rod 23 and has a fastener at its end to prevent detachment.

[0038] In this embodiment, hinge seats 24 are fixed on both the nut sleeve 22 and the semi-circular housing 11. The hinge seats 24 and the support rod 23 are reliably hinged together by a pin 25. The pin 25 passes through the hinge seats 24 and the support rod 23, and is equipped with fasteners at the ends to prevent detachment, effectively avoiding the risk of loosening under underwater high pressure and vibration environments, and ensuring the long-term stability and reliability of the hinge structure.

[0039] This design significantly improves the durability and adaptability of the tensioning mechanism, ensuring the continuous and efficient operation of underwater electrical equipment under extreme conditions and avoiding problems such as poor heat dissipation or equipment damage due to connection failure. For example, the nut sleeve 22 can be a wing nut; the pin 25 is a T-shaped shaft, and a nut or radial connecting screw is installed at the end to form a stop to prevent the pin 25 from disengaging from the hinge seat 24 and the support rod 23.

[0040] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown in the figure, this application embodiment provides a tensioning mechanism for underwater electrical equipment. The tensioning mechanism for underwater electrical equipment has grooves 12 for installing photoelectric devices on opposite sides of the two semi-circular arc shells 11. The grooves 12 are arranged through the semi-circular arc shells 11 along their length.

[0041] In this embodiment, each of the two semi-circular arc-shaped shells 11 has a through groove 12 extending along its length on one side, specifically for the precise installation and fixation of optoelectronic devices. This through groove 12 design ensures that the optoelectronic devices are evenly distributed along the entire length of the shell, effectively avoiding stress concentration during installation. At the same time, the semi-circular arc-shaped shells 11 form a comprehensive and tight contact interface with the outer cylinder, significantly improving heat conduction efficiency.

[0042] Under high pressure underwater, this structure can stably maintain the heat dissipation performance of optoelectronic devices and prevent poor contact or device damage caused by water pressure fluctuations or equipment vibration, thereby ensuring the long-term high reliability operation of underwater electrical equipment.

[0043] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a tensioning mechanism for underwater electrical equipment. Both ends of the double-ended screw 21 of the tensioning mechanism are provided with internal hexagonal slots for matching internal hexagonal wrenches.

[0044] In this embodiment, both ends of the double-ended screw 21 are provided with internal hexagonal slots, specifically designed to match standard internal hexagonal wrenches. This design significantly simplifies the tension adjustment operation, making the installation and maintenance process more convenient and efficient.

[0045] Operators can easily complete the tightening and loosening actions using a general-purpose Allen wrench, without the need for additional tools or high torque operation. This significantly reduces assembly difficulty and on-site maintenance costs, ensuring that underwater electrical equipment maintains a stable and reliable tightening state during long-term operation, effectively improving overall reliability and practicality.

[0046] Firstly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides a tensioning mechanism for underwater electrical equipment. The tensioning mechanism of the underwater electrical equipment has a nut sleeve 22 threadedly connected with a locking pin extending to the inner side. The locking pin is used to tighten the thread of the double-ended screw 21.

[0047] In this embodiment, a locking pin extending inwards is threaded onto the nut sleeve 22. This locking pin precisely locks the nut sleeve 22 by tightening the threads of the double-ended screw 21. Under underwater high pressure and equipment vibration environments, this design effectively prevents the nut sleeve 22 from loosening unexpectedly, ensuring that the tensioning mechanism maintains a stable and reliable tension state during long-term operation.

[0048] By eliminating the risk of micro-motion caused by vibration or pressure fluctuations, the contact tightness between the split section 1 and the pressure-bearing cylinder 3 is significantly improved, avoiding problems such as poor heat dissipation or structural failure, thereby ensuring the continuous high-reliability operation of underwater electrical equipment under extreme conditions.

[0049] See Figures 1 to 4 As shown, a second aspect of this application provides an underwater electrical device, including: Pressure-bearing cylinder 3; The tensioning mechanism of the underwater electrical equipment in any of the above embodiments is disposed inside the pressure-bearing cylinder 3.

[0050] The underwater electrical equipment provided in this application embodiment includes a pressure-bearing cylinder 3 and a tensioning mechanism disposed therein. The tensioning mechanism drives the nut sleeve 22 and the support rod 23 through a double-ended screw 21 to achieve uniform opening of the split joint 1, ensuring that the internal unit and the pressure-bearing cylinder 3 form a comprehensive and tight contact interface.

[0051] This design significantly optimizes heat transfer efficiency and effectively avoids poor contact or device damage caused by water pressure fluctuations in underwater high-pressure environments. This ensures high reliability and heat dissipation stability of the equipment during long-term operation, laying a solid foundation for the long-term and efficient operation of underwater communication equipment.

[0052] Secondly, in some alternative embodiments: see Figures 1 to 4 As shown, this application embodiment provides an underwater electrical device. An insulating cylinder 4, which serves as a buffer / heat-conducting layer, is provided between the pressure-bearing cylinder 3 and the tensioning mechanism. The tensioning mechanism tightens the insulating cylinder 4 to make the insulating cylinder 4 come into close contact with the pressure-bearing cylinder 3.

[0053] In this embodiment, an insulating cylinder 4 is provided between the pressure-bearing cylinder 3 and the tensioning mechanism, serving as an intermediate layer that combines buffering and heat conduction functions. The tensioning mechanism, through uniform tensioning, ensures that the insulating cylinder 4 fits tightly against the surface of the pressure-bearing cylinder 3, effectively absorbing micro-deformation stress under underwater high-pressure conditions, while significantly improving heat transfer efficiency.

[0054] This design avoids poor contact or mechanical damage to internal units caused by water pressure fluctuations, ensuring a stable heat dissipation path and maintaining high equipment reliability during long-term operation. It provides key guarantees for efficient heat dissipation and structural safety of underwater electrical equipment.

[0055] For example, the insulating cylinder 4 can be made of materials such as silicone rubber, epoxy resin-based thermally conductive and insulating composite materials, or ceramic-filled polymers. These materials have excellent insulation, thermal conductivity, and elasticity, which can effectively buffer the micro-deformation of the pressure-bearing cylinder 3 under high-pressure underwater conditions, while promoting the thermal conduction efficiency between the internal units and the pressure-bearing cylinder 3.

[0056] During long-term underwater operation, it can avoid poor contact or heat dissipation failure caused by water pressure fluctuations, ensuring high reliability and structural stability of the equipment, and is suitable for the harsh working conditions of high-power underwater communication equipment.

[0057] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0058] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A tensioning mechanism for underwater electrical equipment, characterized in that, include: The half section (1) comprises two opposing semi-circular shells (11) that form an internal cavity. The tensioning assembly (2) includes a double-ended screw (21) located between the two semi-circular arc shells (11) with opposite threads at both ends. The two ends of the double-ended screw (21) are respectively threaded with nut sleeves (22), and each nut sleeve (22) is hinged to the semi-circular arc shell (11) with a support rod (23).

2. The tensioning mechanism for underwater electrical equipment as described in claim 1, characterized in that: The number of tensioning components (2) is two, and the two tensioning components (2) are located on both sides of the semi-circular arc shell (11) and are arranged symmetrically.

3. The tensioning mechanism for underwater electrical equipment as described in claim 1, characterized in that: The support rod (23) is arranged symmetrically with respect to the center of the nut sleeve (22) and simultaneously symmetrically with respect to the center of the semi-circular shell (11).

4. The tensioning mechanism for underwater electrical equipment as described in claim 1, characterized in that: The double-ended screw (21) is aligned with the length direction of the semi-circular arc shell (11), and both ends of the double-ended screw (21) protrude from the semi-circular arc shell (11). The hinge end of the support rod (23) and the semi-circular arc shell (11) is located on both ends of the semi-circular arc shell (11) along its length direction.

5. The tensioning mechanism for underwater electrical equipment as described in claim 1, characterized in that: Both the nut sleeve (22) and the semi-circular housing (11) are provided with hinge seats (24), and the hinge seats (24) and the support rod (23) are hinged by a pin (25); the pin (25) passes through the hinge seat (24) and the support rod (23) and is provided with a fastener at its end to prevent it from falling off.

6. The tensioning mechanism for underwater electrical equipment as described in claim 1, characterized in that: Each of the two semi-circular arc shells (11) has a groove (12) for mounting optoelectronic devices on one side of its opposite side. The groove (12) extends through the semi-circular arc shell (11) along its length.

7. The tensioning mechanism for underwater electrical equipment as described in claim 1, characterized in that: Both ends of the double-ended screw (21) are provided with internal hexagonal slots for matching internal hexagonal wrenches.

8. The tensioning mechanism for underwater electrical equipment as described in claim 1, characterized in that: The nut sleeve (22) is threaded with a locking pin extending to the inside, the locking pin being used to tighten the threads of the double-ended screw (21).

9. An underwater electrical device, characterized in that, include: Pressure-bearing cylinder (3); The tensioning mechanism of the underwater electrical equipment according to any one of claims 1 to 8, wherein the tensioning mechanism is disposed inside the pressure-bearing cylinder (3).

10. The underwater electrical equipment as described in claim 9, characterized in that: An insulating cylinder (4) is provided between the pressure-bearing cylinder (3) and the tensioning mechanism to act as a buffer / heat-conducting layer. The tensioning mechanism tightens the insulating cylinder (4) to make the insulating cylinder (4) come into close contact with the pressure-bearing cylinder (3).

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