High-voltage coaxial cable connecting device

Abstract

The utility model discloses a high-voltage coaxial cable connecting device, a coaxial cable assembly comprises an inner conductor and an outer conductor, the connecting device comprises an upper insulating part, a middle insulating part, a lower insulating part and a crimping sealing part, and the upper insulating part, the middle insulating part and the lower insulating part are sequentially combined through bolts to form a conductive cavity. An insulating cavity for isolating the inner conductor from the outer conductor is arranged in the conductive cavity, the conductive end of the magnet coil penetrates through the conductive cavity and is respectively conducted with the inner conductor and the outer conductor, and the crimping sealing element locks the coaxial cable assembly through the locking part and forms a sealing structure with the conductive cavity; according to the utility model, the coaxial cable assembly, the upper insulating part, the middle insulating part, the lower insulating part and the crimping sealing part form a detachable sealing structure, so that the device can flexibly adjust the number of cables, and meanwhile, the insulating cavity formed in the conductive cavity also seals all conductors in the insulating device, so that the creepage distance is greatly increased, and the service life of the cable is prolonged. The conductor is prevented from being exposed, and the safety performance of the whole device is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical system connection devices, specifically to a high-voltage coaxial cable connection device. Background Technology

[0002] In today's era of rapid technological advancement, magnetic confinement plasma devices occupy an important position in numerous scientific research fields and industrial applications. During the operation of these devices, the formation of the magnetic field directly affects the device's performance and functionality, and the formation of the magnetic field is closely related to the current flowing through the magnet coil.

[0003] The power supply system for magnet coils typically uses pulsed power supplies, characterized by high voltage and high current. To ensure a stable connection and efficient power transmission between the power supply system and the magnet coil, a coaxial cable is used for connection. This connection method imposes extremely stringent performance requirements on the connection point between the magnet coil and the coaxial cable, specifically including high insulation performance to prevent current leakage from causing safety accidents and equipment failures; high current carrying capacity to meet the high current demands of the magnet coil during operation; and low stray inductance to avoid affecting the stability and efficiency of current transmission.

[0004] Currently, there are two main existing connection methods in the field of magnet coil and coaxial cable connection technology. The first method involves connecting the inner and outer conductors of the magnet coil and coaxial cable, followed by integral insulation casting. While this method ensures connection stability and insulation to a certain extent, it has a serious drawback: a lack of detachability. In subsequent experimental research, it is often necessary to flexibly change the number of cables according to actual needs. However, because this integral insulation casting connection method is not detachable, changing the number of cables becomes extremely difficult, severely restricting the in-depth development of experimental research and equipment upgrades.

[0005] The second existing connection device involves fabricating a detachable insulating box and arranging two symmetrical sets of coaxial cables. In this structure, the inner conductors of the two sets of coaxial cables are connected to the two ends of the magnet coil, while the outer conductors are interconnected to form a circuit, as disclosed in Chinese patent CN201910449022.9. However, this connection device also reveals some problems in practical applications. On the one hand, this structure requires two power supplies to be connected in series with the magnet coil, which makes it unsuitable for common scenarios where a single power supply powers the magnet coil, greatly limiting its application range. On the other hand, the outer conductor connection points of this connection device are exposed. In plasma magnetic confinement devices, the voltage of the magnet coil is usually at a high voltage level of tens or even hundreds of kV. Any exposed cable is like a "time bomb," posing a great safety hazard. A slight mistake could lead to an electric shock accident, seriously threatening the lives of operators and the normal operation of the equipment. Utility Model Content

[0006] The purpose of this utility model is to provide a high-voltage coaxial cable connection device. This device forms a detachable sealing structure through a coaxial cable assembly, an upper insulating component, a middle insulating component, a lower insulating component, and a crimping seal, which allows for flexible adjustment of the number of cables. At the same time, the insulating cavity formed inside the conductive cavity also encloses all conductors inside the insulating device, greatly increasing the creepage distance, avoiding conductor exposure, and improving the safety performance of the entire device.

[0007] This utility model is achieved through the following technical solution:

[0008] A high-voltage coaxial cable connection device is provided. The coaxial cable assembly includes an inner conductor and an outer conductor. The connection device includes an upper insulating component, an intermediate insulating component, and a lower insulating component. The upper insulating component, the intermediate insulating component, and the lower insulating component are sequentially assembled by bolts to form a conductive cavity. An insulating cavity is provided inside the conductive cavity to isolate the inner conductor and the outer conductor. The conductive end of the magnet coil passes through the conductive cavity and is in communication with the inner conductor and the outer conductor respectively.

[0009] It also includes a crimp seal, which locks the coaxial cable assembly with a locking part and forms a sealed structure with the conductive cavity.

[0010] In this design, the upper, middle, and lower insulating components are assembled with bolts to form a conductive cavity, providing a structural carrier for the conductive connection between the magnet coil and the coaxial cable assembly. Simultaneously, the insulating cavity within the conductive cavity achieves electrical isolation between the inner and outer conductors, meeting insulation requirements under high-voltage conditions. Furthermore, the conductive ends of the magnet coil pass through the conductive cavity and are connected to the inner and outer conductors of the coaxial cable assembly, establishing a current transmission path between a single power supply and the magnet coil, overcoming the limitation of existing technologies requiring two power supplies in series. Additionally, the crimp seal and its locking mechanism not only lock and fix the coaxial cable assembly but also form a sealed structure with the conductive cavity, completely enclosing the conductor connection within the insulating device, preventing exposure of the outer conductor connection, and effectively improving the safety and reliability of the device.

[0011] Furthermore, one end of the intermediate insulating member is provided with a first matching groove to accommodate one conductive end of the magnet coil, and the other end of the intermediate insulating member is provided with a second matching groove to accommodate the other conductive end of the magnet coil.

[0012] The first matching slot is provided with multiple sets of insulating pillars, and a through hole is opened in the middle of the insulating pillar. The inner conductor passes through the through hole and is connected to another conductive end of the magnet coil. The outer conductor extends along the outer side wall of the insulating pillar and is connected to one of the conductive ends of the magnet coil.

[0013] In this design, the first and second matching slots at both ends of the intermediate insulating component provide positioning and installation space for the two conductive ends of the magnet coil, ensuring the stable embedding of the magnet coil into the connecting device. The multiple sets of insulating pillars and their through holes within the first matching slot provide a path for the inner conductor to connect to the other conductive end of the magnet coil through the insulating pillars. Furthermore, the outer walls of the insulating pillars provide a support structure for the outer conductor to extend and connect to the corresponding conductive end of the magnet coil, achieving radial separation between the inner and outer conductors in space. Combined with the insulating material properties of the insulating pillars, this effectively increases the creepage distance between them, meeting the insulation requirements under high-voltage environments. Simultaneously, the multiple sets of insulating pillars allow the two conductive ends of the magnet coil to be directly connected to the inner and outer conductors of the coaxial cable assembly, forming an independent connection path between a single power supply and the magnet coil, avoiding the limitations of existing technologies that rely on the symmetrical arrangement of two sets of coaxial cables.

[0014] Furthermore, the coaxial cable assembly also includes an inner conductor insulation layer, an outer conductor insulation layer, and a tubular conductor;

[0015] The inner conductor, the inner conductor insulation layer, the outer conductor, and the outer conductor insulation layer are arranged sequentially from the inside to the outside. One end of the tubular conductor is connected to the outer conductor, and the other end of the tubular conductor extends along the outer side wall of the insulating column and is connected to one of the conductive ends of the magnet coil.

[0016] In this design, the tubular conductor serves as an extension of the outer conductor, with one end connected to the outer conductor and the other end extending along the outer wall of the insulating pillar of the intermediate insulating component and connecting to the conductive end of the magnet coil. This structure utilizes the supporting effect of the insulating pillar to achieve radial extension of the outer conductor in space, creating physical isolation between the outer and inner conductors through the insulating pillar and increasing the creepage distance. Simultaneously, the conductivity of the tubular conductor ensures stable conduction between the outer conductor and the conductive end of the magnet coil. Furthermore, the way the tubular conductor extends along the outer wall of the insulating pillar, combined with the matching slot structure of the intermediate insulating component, allows the coaxial cable assembly to be precisely positioned and connected to the corresponding conductive end of the magnet coil, forming an independent current transmission path between a single power supply and the magnet coil.

[0017] Furthermore, the coaxial cable assembly also includes an inner conductor lead-out post, which is connected to the end of the inner conductor and passes through the through hole to be bolted to the other conductive end of the magnet coil.

[0018] In this design, the inner conductor lead-out post is connected to the end of the inner conductor as an extension of the inner conductor. After passing through the through hole of the insulating post of the intermediate insulating component, it is connected to the other conductive end of the magnet coil by bolts. On the one hand, the detachability of the bolt connection facilitates the installation, maintenance, and subsequent adjustment of the number of cables. On the other hand, the extension of the lead-out post structure allows the inner conductor to pass precisely through the through hole of the insulating post, ensuring that the inner conductor and the outer conductor maintain a reliable creepage distance in space through the insulating post.

[0019] Furthermore, the upper insulating member has a covering hole that matches the lead-out post of the inner conductor.

[0020] In this design, the covering hole is adapted to the inner conductor lead-out post, which can tightly wrap the exposed part of the lead-out post, preventing the inner conductor from directly contacting the outside world under high voltage, effectively preventing leakage risk and improving the overall insulation performance of the device. At the same time, the covering hole provides a stable installation and positioning structure for the lead-out post, ensuring that after the inner conductor lead-out post passes through the through hole of the intermediate insulation component, its connection with the upper insulation component maintains coaxiality and mechanical stability, avoiding loosening of the connection due to vibration or external force, thereby ensuring reliable conduction between the inner conductor and the conductive end of the magnet coil.

[0021] Furthermore, the lower insulating member has a through hole that matches the insulating post, and the free end of the insulating post extends into the through hole.

[0022] In this design, the through holes provide precise positioning for the insulating posts. During assembly, workers can easily insert the insulating posts according to the position of the through holes, ensuring that each component is installed accurately and without error. This improves installation efficiency and ensures installation accuracy, thereby ensuring that the conductive end of the magnet coil can be correctly connected to the inner and outer conductors of the coaxial cable assembly.

[0023] Furthermore, a locking hole is provided on the outside of the through hole, and the press-fit seal is provided with a press fitting that matches the thread of the locking hole.

[0024] In this design, the threaded engagement between the locking hole and the crimping fitting provides the crimping seal with installation positioning and tightening force, enabling the crimping seal to apply axial pressure to the outer conductor lead-out of the coaxial cable assembly (such as the flange of the tubular conductor), ensuring tight conductivity between the outer conductor and the conductive end of the magnet coil. Simultaneously, during the tightening process, the flange at the tail of the tubular conductor fits against the conductive end of the magnet coil, completely enclosing the connection part of the coaxial cable assembly inside the conductive cavity.

[0025] Furthermore, the locking part includes a limiting post connected to the outside of the coaxial cable assembly, and the end of the crimp connector presses against the limiting post.

[0026] In this design, the limiting post, as part of the coaxial cable assembly, is pressed by its end during the tightening of the crimp connector. This provides axial positioning for the coaxial cable assembly, ensuring that the outer conductor (such as a tubular conductor) is tightly fitted with the conductive end of the magnet coil, forming a low-resistance conductive connection and ensuring the stability of high-current transmission.

[0027] Furthermore, the locking part includes a locking ring and a limiting head, both of which are made of elastic material. The locking ring is sleeved in the wire passage hole of the crimp connector. Multiple limiting heads are provided and evenly distributed on the outer side wall of the locking ring. One end of the limiting head extends toward the outer side wall of the crimp connector, and the other end extends toward the inner wall of the wire passage hole. When the crimp connector is screwed into the locking hole, the end of the limiting head presses against the outer side wall of the coaxial cable assembly.

[0028] In this design, a locking ring is fitted into the wire passage hole of the crimp connector. Multiple limiting heads are evenly distributed and connected to the outer wall of the locking ring and extend into the inner wall of the wire passage hole. When the crimp connector is screwed into the locking hole of the lower insulation component, the elastic material locking ring deforms under axial pressure, causing the ends of the limiting heads to evenly press against the outer wall of the coaxial cable assembly. This achieves adaptive fixing of cables with different outer diameters through elastic clamping force, avoiding loosening caused by cable size deviation. Furthermore, the tight fit between the limiting heads and the outer wall of the cable, combined with the threaded seal between the crimp connector and the locking hole, completely seals the cable connection within the conductive cavity, effectively preventing the intrusion of external impurities and leakage of the internal electric field.

[0029] Furthermore, the locking part includes a locking ring and a limiting head, wherein the locking ring is a component made of elastic material and has an open loop at one end;

[0030] The locking ring is sleeved in the wire passage hole of the crimping connector, and the limiting heads are arranged in pairs and connected to the outer side wall of the locking ring. The free end of the limiting head extends toward the outer side wall of the crimping connector. When the crimping connector is screwed into the locking hole, the locking ring clamps the outer side wall of the coaxial cable assembly.

[0031] In this design, the locking ring of the flexible open-loop type is fitted into the wire passage hole of the crimp connector, and a pair of limiting heads are connected to its outer wall and extend outward from the crimp connector. When the crimp connector is screwed into the locking hole of the lower insulation component, the locking ring of the open-loop type is radially contracted under axial pressure, which drives the limiting heads to clamp the outer wall of the coaxial cable assembly synchronously. This achieves adaptive fastening of cables with different outer diameters through elastic clamping force, avoiding loosening due to dimensional deviations. Furthermore, the tight fit between the locking ring and the outer wall of the cable, combined with the sealing structure formed by the threaded connection of the crimp connector, completely seals the cable connection part inside the conductive cavity.

[0032] In summary, compared with the prior art, this utility model has the following main advantages and beneficial effects:

[0033] 1. This utility model has a detachable sealing structure formed by an upper insulating component, an intermediate insulating component, a lower insulating component and a press-fit sealing component. It does not rely on the symmetrical arrangement of two sets of coaxial cables. It can achieve independent conductive connection between a single power supply and a magnet coil by simply overlapping the inner conductor lead-out post and the outer conductor tubular conductor of a single set of coaxial cables in the axial and radial directions. This solves the limitation of the prior art that requires two sets of power supplies to be connected in series and expands the application scenarios of the device.

[0034] 2. This utility model completely isolates and encloses the inner and outer conductors within the insulation device. Combined with the sealing effect formed by the elastic locking part through the crimping seal, it completely eliminates the safety hazards of exposed outer conductor connection positions, significantly increases the creepage distance, and meets the high insulation requirements under high voltage environments. At the same time, the detachable bolt connection and elastic locking structure enable the device to ensure high sealing and connection stability while facilitating flexible adjustment or maintenance of the number of cables in the later stages, overcoming the defects of existing integral insulation casting structures that cannot be disassembled. Attached Figure Description

[0035] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0036] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0037] Figure 2 This is a schematic diagram of the upper insulating component;

[0038] Figure 3 This is a schematic diagram of the intermediate insulating component;

[0039] Figure 4 This is a cross-sectional view of the intermediate insulating component.

[0040] Figure 5 This is a schematic diagram of the structure of the lower insulating component;

[0041] Figure 6 This is a cross-sectional structural diagram of the lower insulating component;

[0042] Figure 7 This is a schematic diagram of the press-fit seal structure provided in Example 1;

[0043] Figure 8 This is a schematic diagram of the coaxial cable assembly structure provided in Example 1;

[0044] Figure 9 This is a schematic diagram of the structure of Example 1 in use.

[0045] Figure 10 This is a schematic diagram of the press-fit seal structure provided in Example 2;

[0046] Figure 11 This is a schematic diagram of the locking ring structure provided in Example 2;

[0047] Figure 12 This is a schematic diagram of the structure of Example 2 in its usage state;

[0048] Figure 13 This is a schematic diagram of the press-fit seal structure provided in Example 3;

[0049] Figure 14 This is a schematic diagram of the locking ring structure provided in Example 3.

[0050] The attached diagram shows the markings and corresponding component names:

[0051] 1-Magnetic coil, 1-1-First conductive terminal, 1-2-Second conductive terminal;

[0052] 2-Upper insulating part, 2-1-Protrusion, 2-2-Covering hole, 2-3-Extension;

[0053] 3-Intermediate insulating component, 3-1-Magnet coil slot, 3-2-First matching slot, 3-3-Insulating post, 3-4-Steel wire sleeve, 3-5-Second matching slot;

[0054] 4-Lower insulating part, 4-1-Locking hole, 4-2-Through hole, 4-3-Boss;

[0055] 5-Crimp seal, 5-1-Crimp connector, 5-2-Tightening head, 5-3-Locking ring, 5-4-Limiting head;

[0056] 6-Coaxial cable assembly, 6-1-Inner conductor, 6-2-Inner conductor insulation layer, 6-3-Outer conductor, 6-4-Outer conductor insulation layer, 6-5-Tube conductor, 6-6-Inner conductor lead-out post, 6-7-Limiting post. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0058] Example 1

[0059] This embodiment 1 provides a high-voltage coaxial cable connection device, such as... Figure 1 As shown, the connecting device includes an upper insulating component 2, an intermediate insulating component 3, a lower insulating component 4, a crimping seal component 5, and a coaxial cable assembly 6;

[0060] Among them, such as Figure 8 As shown, the coaxial cable assembly 6 includes an inner conductor 6-1, an inner conductor insulation layer 6-2, an outer conductor 6-3, and an outer conductor insulation layer 6-4, which are sequentially wrapped from the inside to the outside. A tubular conductor 6-5 with a flange is welded to the tail of the outer conductor 6-3, and the end of the inner conductor 6-1 is connected to the inner conductor lead-out post 6-6.

[0061] Please also see Figures 2-6As shown, the upper insulating member 2, the middle insulating member 3 and the lower insulating member 4 are sequentially assembled by bolts to form a conductive cavity. An insulating cavity is provided inside the conductive cavity to isolate the inner conductor 6-1 and the outer conductor 6-3. The first conductive end 1-1 and the second conductive end 1-2 of the magnet coil 1 pass through the conductive cavity and are in communication with the inner conductor 6-1 and the outer conductor 6-3 respectively. The crimping seal 5 locks the coaxial cable assembly 5 through the locking part and forms a sealed structure with the conductive cavity.

[0062] Specifically, such as Figures 3-4 As shown, one end of the intermediate insulating member 3 is provided with a first matching groove 3-2 to accommodate the second conductive end 1-2, and the other end of the intermediate insulating member 3 is provided with a second matching groove 3-5 to accommodate the first conductive end 1-1. The same side wall of the first matching groove 3-2 and the second matching groove 3-5 are open for the conductive end of the magnet coil 1 to pass through. Multiple sets of insulating pillars 3-3 are connected to the bottom wall of the first matching groove 3-2. The insulating pillar 3-3 is made of insulating material. A through hole is provided in the middle of the insulating pillar 3-3. The inner conductor lead-out pillar 6-6 passes through the through hole and is connected to the first conductive end 1-1 of the magnet coil 1 by bolts. The tubular conductor 6-5 extends along the outer side wall of the insulating pillar 3-3 and is connected to the second conductive end 1-2 of the magnet coil 1.

[0063] Please also see Figure 2 , Figures 4-5 and Figure 9 As shown, the upper insulating member 2 is connected to a protrusion 2-1 that matches the second matching groove 3-5, and the protrusion 2-1 is provided with a covering hole 2-2 of the diameter of the matching inner conductor lead-out post 6-6. Both the first matching groove 3-2 and the second matching groove 3-5 are provided with magnet coil slots 3-1 at the opening sidewalls. The upper insulating member 2 is matched and connected to an extension 2-3 at the magnet coil slot 3-1 of the first matching groove 3-2. The extension 2-3 abuts against the first conductive end 1-1. Similarly, the lower insulating member 4 is matched and connected to a boss 4-3 at the magnet coil slot 3-1 of the second matching groove 3-5. The boss 4-3 abuts against the second conductive end 1-2.

[0064] Please refer to the following: Figures 5-7As shown, the lower insulating component 4 has a through hole 4-2 for matching the insulating post 3-3. The free end of the insulating post 3-3 extends into the through hole 4-2, which provides precise positioning for the insulating post 3-3. During assembly, the operator can easily insert the insulating post 3-3 according to the position of the through hole 4-2. A locking hole 4-1 is also provided on the outside of the through hole 4-2. The crimp seal 5 includes a crimp connector 5-1 that is threadedly matched with the locking hole 4-1. The threaded engagement between the locking hole 4-1 and the crimp connector 5-1 provides installation positioning and fastening force for the crimp seal 5. During the tightening process of the crimp connector 5-1 by tightening the head 5-2, the tail flange of the tubular conductor 6-5 is in contact with the second conductive end 1-2, completely sealing the connection part of the coaxial cable assembly 6 inside the conductive cavity, greatly increasing the creepage distance and improving the safety performance of the entire device.

[0065] In this embodiment, to ensure that the tubular conductor 6-5 and the second conductive end 1-2 are tightly fitted, the locking part includes a limiting post 6-7 connected to the outside of the coaxial cable assembly 6. During the tightening process of the crimp connector 5-1, the end of the crimp connector 5-1 presses against the limiting post 6-7 to provide axial positioning for the coaxial cable assembly 6.

[0066] In this embodiment, since the upper insulating component 2, the middle insulating component 3 and the lower insulating component 4 are all insulating materials, such as epoxy resin or polytetrafluoroethylene and other plastics, in order to ensure the number of disassembly cycles, steel wire sleeves 3-4 are connected to the threaded holes of the upper insulating component 2, the middle insulating component 3 and the lower insulating component 4.

[0067] Example 2

[0068] This embodiment 2 provides a high-voltage coaxial cable connection device based on embodiment 1, such as... Figures 1-6 and Figures 10-12 As shown, the difference lies in the structure of the crimping seal 5 and the locking part. In this embodiment, the locking part includes a locking ring 5-3 and a limiting head 5-4. The locking ring 5-3 and the limiting head 5-4 are made of elastic material, such as thermoplastic elastomer or silicone rubber. The locking ring 5-3 is sleeved in the wire hole of the crimping connector 5-1. At least four limiting heads 5-4 are provided and evenly distributed and connected to the outer wall of the locking ring 5-3. One end of the limiting head 5-4 extends to the outer wall of the crimping connector 5-1, and the other end of the limiting head 5-4 extends to the inner wall of the wire hole. When the crimping connector 5-1 is screwed into the locking hole 4-1, the elastic material locking ring 5-3 deforms under axial pressure, causing the end of the limiting head 5-4 to evenly press against the outer wall of the coaxial cable assembly 6. This achieves adaptive fixing of cables with different outer diameters through elastic clamping force, and also achieves tight contact between the limiting head 5-4 and the outer wall of the cable.

[0069] Example 3

[0070] This embodiment 3 provides a high-voltage coaxial cable connection device based on embodiment 1, such as... Figures 1-6 and Figures 13-14 As shown, the difference lies in the structure of the crimping seal 5 and the locking part. In this embodiment, the locking part includes a locking ring 5-3 and a limiting head 5-4. The locking ring 5-3 is made of elastic material and has an open loop at one end. The locking ring 5-3 is fitted into the wire hole of the crimping connector 5-1. The limiting heads 5-4 are arranged in pairs and connected to the outer wall of the locking ring 5-3. The free end of the limiting head 5-4 extends towards the outer wall of the crimping connector 5-1. When the crimping connector 5-1 is screwed into the locking hole 4-1, the open-loop locking ring 5-3 is radially contracted by axial pressure, which drives the limiting head 5-4 to simultaneously clamp the outer wall of the coaxial cable assembly 6. This achieves adaptive fastening of cables with different outer diameters through elastic clamping force, avoiding loosening caused by dimensional deviations, and also achieves tight fit between the locking ring 5-3 and the outer wall of the cable.

[0071] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A high voltage coaxial cable connection device, a coaxial cable assembly (6) comprising an inner conductor (6-1) and an outer conductor (6-3), characterized in that, The connecting device comprises an upper insulating piece (2), a middle insulating piece (3) and a lower insulating piece (4), the upper insulating piece (2), the middle insulating piece (3) and the lower insulating piece (4) are combined by bolts to form a conductive cavity in sequence, an insulating cavity for isolating the inner conductor (6-1) and the outer conductor (6-3) is arranged in the conductive cavity, and the conductive ends of the magnet coil (1) pass through the conductive cavity and are in conduction with the inner conductor (6-1) and the outer conductor (6-3) respectively; Further comprising a crimping sealing piece (5), the crimping sealing piece (5) locks the coaxial cable assembly (6) by a locking part and forms a sealed structure with the conductive cavity.

2. A high voltage coaxial cable connection device according to claim 1, characterized in that One end of the middle insulating piece (3) is provided with a first matching groove (3-2) for accommodating one conductive end of the magnet coil (1), and the other end of the middle insulating piece (3) is provided with a second matching groove (3-5) for accommodating the other conductive end of the magnet coil (1). Wherein, a plurality of groups of insulating columns (3-3) are arranged in the first matching groove (3-2), a through hole is formed in the middle part of the insulating column (3-3), the inner conductor (6-1) passes through the through hole and is connected with the other conductive end of the magnet coil (1), and the outer conductor (6-3) extends along the outer side wall of the insulating column (3-3) and is connected with one conductive end of the magnet coil (1).

3. A high voltage coaxial cable connection device according to claim 2, characterised in that, The coaxial cable assembly (6) further comprises an inner conductor insulating layer (6-2), an outer conductor insulating layer (6-4) and a tubular conductor (6-5); Wherein, the inner conductor (6-1), the inner conductor insulating layer (6-2), the outer conductor (6-3) and the outer conductor insulating layer (6-4) are arranged in sequence from inside to outside, one end of the tubular conductor (6-5) is connected with the outer conductor (6-3), and the other end of the tubular conductor (6-5) extends along the outer side wall of the insulating column (3-3) and is connected with one conductive end of the magnet coil (1).

4. A high voltage coaxial cable connection device according to claim 3, characterised in that, The coaxial cable assembly (6) further comprises an inner conductor lead-out column (6-6), the inner conductor lead-out column (6-6) is connected to the end of the inner conductor (6-1) and is bolted with the other conductive end of the magnet coil (1) through the through hole.

5. A high voltage coaxial cable connection device according to claim 4, characterised in that, The upper insulating piece (2) is provided with a cladding hole (2-2) matching the inner conductor lead-out column (6-6).

6. A high voltage coaxial cable connection device according to claim 4, wherein, The lower insulating piece (4) is provided with a through hole (4-2) matching the insulating column (3-3), and the free end of the insulating column (3-3) extends into the through hole (4-2).

7. A high voltage coaxial cable connection device according to claim 6, characterised in that A locking hole (4-1) is further formed on the outside of the through hole (4-2), and the crimping sealing piece (5) is provided with a crimping head (5-1) threadedly matched with the locking hole (4-1).

8. A high voltage coaxial cable connection device according to claim 7, characterised in that, The locking part comprises a limiting column (6-7) connected to the outside of the coaxial cable assembly (6), and the end of the crimping head (5-1) presses the limiting column (6-7).

9. A high voltage coaxial cable connection device according to claim 7, wherein, The locking part comprises a locking ring (5-3) and a limiting head (5-4), the locking ring (5-3) and the limiting head (5-4) are made of elastic material, wherein the locking ring (5-3) is sleeved in the wire hole of the compression joint (5-1), the limiting head (5-4) is arranged on the outer side wall of the locking ring (5-3) in multiple and is uniformly distributed, one end of the limiting head (5-4) extends to the outer side wall of the compression joint (5-1), the other end of the limiting head (5-4) extends to the inner wall of the wire hole, when the compression joint (5-1) is screwed into the locking hole (4-1), the end of the limiting head (5-4) is pressed against the outer side wall of the coaxial cable assembly (6).

10. A high voltage coaxial cable connection device according to claim 7, wherein, The locking part comprises a locking ring (5-3) and a limiting head (5-4), the locking ring (5-3) is made of elastic material and is open at one end; The locking ring (5-3) is sleeved in the wire hole of the compression joint (5-1), the limiting head (5-4) is arranged in pairs on the outer side wall of the locking ring (5-3), the free end of the limiting head (5-4) extends to the outer side wall of the compression joint (5-1), when the compression joint (5-1) is screwed into the locking hole (4-1), the locking ring (5-3) clamps the outer side wall of the coaxial cable assembly (6).

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