Inner cylinder connecting structure for secondary magnetic insulation transmission line

Abstract

The utility model relates to a large-scale pulse power device, and provides an inner cylinder connecting structure for a secondary magnetic insulation transmission line, which aims to solve the problems that the existing transmission line structure is low in coaxiality and collimation, cannot ensure the efficient transmission of high-voltage electric pulses and the like, and comprises a connecting cover ring, a blind plate and a plurality of axial fixing bolts, the connecting cover ring comprises an upper half-moon-shaped cover plate and a lower half-moon-shaped cover plate, a plurality of screw holes are formed in the circumferential surfaces of the outer sides of the upper half-moon-shaped cover plate and the lower half-moon-shaped cover plate, and the upper half-moon-shaped cover plate and the lower half-moon-shaped cover plate are in butt joint with each other and fixedly connect the connecting ends of the two adjacent transmission line inner cylinders through radial screws in the plurality of screw holes; blind plates are arranged on the screw holes of the upper half-moon cover plate and the lower half-moon cover plate. A plurality of axial fixing bolts are evenly distributed on the connecting end face of the front end of each stage of transmission line inner cylinder in the circumferential direction of the connecting end face, the multiple axial fixing bolts are used for fixedly connecting the connecting ends of two adjacent transmission line inner cylinders in the axial direction, and the coaxiality between the multiple stages of transmission line inner cylinders is ensured.

Description

Technical Field

[0001] This utility model relates to a large pulse power device, specifically to an inner cylinder connection structure for a secondary magnetically insulated transmission line. Background Technology

[0002] With the increasing application demands in industrial production, scientific research experiments, and medical diagnostics, there is a need to build large-scale pulse power devices with higher voltage (several mV to tens of mV) and larger current (several mA to tens of mA) to meet the future development needs of the industry.

[0003] Currently, most large-scale pulse power devices are designed based on the principle of induced voltage superposition. They use an induction cavity to couple pulse energy to a secondary magnetically insulated wire and transmit it to the load. These pulse power devices generally adopt a modular design to facilitate expansion and improve the device's power level.

[0004] Coaxial transmission lines are a common pulse conduction structure in large-scale pulse power devices. Secondary magnetically insulated wires are a type of long coaxial transmission line. When the voltage or current level of the device is high, the inner cylinder of the secondary magnetically insulated transmission line can reach tens of meters (up to 20 meters) in length and is a cantilever structure. Due to the long length of the inner cylinder, the material will deform, causing deflection displacement in the device. Existing connection structures on coaxial transmission lines cannot guarantee collimation and coaxiality of the inner and outer cylinders over long spans. This results in high manufacturing costs, complex installation structures, and difficult adjustment processes, while also failing to guarantee efficient transmission of high-voltage pulses. Therefore, a stable transmission line connection structure is needed to ensure efficient transmission of high-voltage pulses. Utility Model Content

[0005] The purpose of this invention is to solve the problems of existing transmission line structures, such as the inability to guarantee the coaxiality and collimation of the inner and outer cylinders of the transmission line, high processing costs, complex installation structures, and the inability to guarantee the efficient transmission of high voltage pulses. Therefore, this invention proposes an inner cylinder connection structure for secondary magnetically insulated transmission lines.

[0006] To achieve the above objectives, the technical solution proposed by this utility model is as follows:

[0007] A secondary magnetically insulated transmission line inner cylinder connection structure is disclosed. The secondary magnetically insulated transmission line includes multiple pulse superimposed segment inner cylinders and multiple isolation extension segment inner cylinders coaxially sleeved from front to back. The multiple coaxially sleeved pulse superimposed segment inner cylinders and isolation extension segment inner cylinders constitute a multi-stage transmission line inner cylinder. The key feature is that: the outer wall of the connecting end of the preceding pulse superimposed segment inner cylinder or isolation extension segment inner cylinder is provided with a circumferential annular groove, and its end is provided with an annular boss; the inner wall of the connecting end of the following pulse superimposed segment inner cylinder or isolation extension segment inner cylinder is provided with an annular insertion interface; the annular insertion interface is inserted into the connecting end of the preceding pulse superimposed segment inner cylinder or isolation extension segment inner cylinder.

[0008] It also includes a connecting cover ring, a blind flange, and multiple axial fixing bolts;

[0009] The connecting cover ring includes an upper half-moon cover plate and a lower half-moon cover plate. Multiple screw holes are provided on the outer circumferential surface of both the upper half-moon cover plate and the lower half-moon cover plate. The upper half-moon cover plate and the lower half-moon cover plate are connected to each other and fixedly connected to the connecting end of the inner cylinder of the previous pulse superposition section or the inner cylinder of the isolation extension section by radial screws in the multiple screw holes.

[0010] Blind plates are provided on each screw hole of the upper and lower half-moon cover plates to ensure that the outer surface of the inner cylinder of the transmission line is flat.

[0011] The annular boss provided on the connecting end of the inner cylinder of the previous pulse superposition section or the inner cylinder of the isolation extension section is fixedly connected to the connecting end of the inner cylinder of the next pulse superposition section or the inner cylinder of the isolation extension section along the axial direction by multiple axial fixing bolts to ensure the coaxiality between the inner cylinders of the multi-stage transmission line.

[0012] Furthermore, a short-circuit connection device is provided on the outer wall of the first-stage transmission line inner cylinder in the multi-stage transmission line inner cylinder, which is used to form an electrical connection between the first-stage transmission line inner cylinder and the inner wall of the induction cavity on the transmission line.

[0013] Furthermore, the short-circuit connection device includes a loading ring and a stop spring installed on the outer circumference of the front end of the inner cylinder of the first-stage pulse superposition section. An annular mounting plate is provided on the outer circumference of the loading ring, and a groove for installing the stop spring is opened on the outer circumference of the annular mounting plate. The stop spring is installed in the groove and abuts against the inner wall of the sensing cavity on the transmission line.

[0014] Furthermore, the annular mounting plate has multiple strip-shaped holes along the circumferential direction on its annular surface to ensure the vacuum extraction efficiency of the inner cylinder of the transmission line.

[0015] Furthermore, a mating opening is provided at the connecting end of the inner cylinder of the next-stage pulse superposition section or the inner cylinder of the isolation extension section to ensure the coaxiality between the inner cylinder of the previous-stage pulse superposition section or the inner cylinder of the isolation extension section and the inner cylinder of the next-stage pulse superposition section or the inner cylinder of the isolation extension section.

[0016] Furthermore, the loading ring comprises two semi-ring loading rings;

[0017] The two semi-ring loading rings interlock to fix the short-circuit connection device on the outer wall of the inner cylinder of the first-stage transmission line.

[0018] Furthermore, multiple screw through holes are provided on the ring surface of the loading ring located on both sides of the annular mounting plate. Screws pass through the screw through holes to fix the loading ring to the outer wall of the inner cylinder of the transmission line.

[0019] Furthermore, the material of the stop spring is beryllium copper.

[0020] Furthermore, both the upper and lower half-moon cover plates have a T-shaped cross-section.

[0021] Furthermore, the length of the inner cylinder of each level of transmission line is 2.5m-3m.

[0022] The beneficial effects of this utility model are:

[0023] 1. This utility model provides an inner cylinder connection structure for a secondary magnetically insulated transmission line. By setting an inner cylinder connection structure at the connection end of two adjacent transmission line inner cylinders, the coaxiality between the two adjacent transmission line inner cylinders is ensured by the connecting cover ring, ensuring a smooth transition between the two transmission line inner cylinders and effectively improving the alignment of the transmission line inner cylinder along the axis. At the same time, the short-circuit connection device ensures good electrical contact between the transmission line inner cylinder and the inner wall of the induction cavity.

[0024] 2. This utility model, by installing a blind plate on the screw hole of the connecting cover ring, makes the outer surface of the inner cylinder of the transmission line flat and smooth, effectively avoiding the sparking phenomenon between the inner and outer cylinders of the transmission line due to sharp corners.

[0025] 3. The connecting cover ring of this utility model is divided into an upper half-moon cover plate and a lower half-moon cover plate, and the loading ring consists of two half-ring loading rings. This structure is easy to disassemble and assemble, effectively saving installation time, and making it convenient for staff to maintain and inspect the structure.

[0026] 4. The short-circuit connection device in this utility model can realize the short-circuit connection between the inner cylinder of the first-stage transmission line and the inner wall of the sensing cavity, effectively reducing the circuit inductance; the electrical connection by the stop spring can not only ensure the stability of the electrical connection between the inner cylinder of the first-stage transmission line and the inner wall of the sensing cavity, but also reduce the friction between the inner cylinder of the first-stage transmission line and the inner wall of the sensing cavity by reasonably selecting the spring margin, which facilitates the disassembly of the inner cylinder of the transmission line and subsequent reconnection.

[0027] 5. This utility model has multiple strip-shaped holes along the circumferential direction on the annular mounting plate on the loading ring, which ensures the gap of the inner cylinder of the transmission line and the vacuum extraction efficiency at the insulation stack of the induction cavity. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the secondary magnetically insulated transmission line in an embodiment of the inner cylinder connection structure for a secondary magnetically insulated transmission line according to the present invention.

[0029] Figure 2 This is a schematic diagram of the inner cylinder connection structure in an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the upper half-moon cover plate in an embodiment of this utility model;

[0031] Figure 4 This is a schematic diagram of the blind plate in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the installation structure of the blind plate and screw holes in an embodiment of this utility model;

[0033] Figure 6 This is a schematic diagram of the connection of the axial fixing bolts in an embodiment of this utility model;

[0034] Figure 7 This is a schematic diagram of the short-circuit connection device in an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the stop spring in an embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram of the loading ring structure in an embodiment of the present invention;

[0037] Figure label:

[0038] 1-Pulse superposition section inner cylinder, 2-Isolation extension section inner cylinder, 3-Transmission line inner cylinder, 4-Inner cylinder connecting device, 5-Connecting cover ring, 501-Upper half-moon cover plate, 502-Lower half-moon cover plate, 6-Blind plate, 7-Screw hole, 8-Short circuit connection device, 9-Inner wall of sensing cavity, 10-Loading ring, 11-Stop spring, 12-Annular mounting plate, 13-Strip hole, 14-Screw through hole, 15-Axial fixing bolt. Detailed Implementation

[0039] like Figure 1 As shown, an inner cylinder connection structure for a secondary magnetically insulated transmission line is disclosed. The secondary magnetically insulated transmission line includes multiple pulse superimposed inner cylinders 1 and multiple isolation extension inner cylinders 2, coaxially sleeved from front to back. The pulse superimposed inner cylinders 1 correspond axially to the induction cavity on the transmission line and are used for high-voltage pulse superimposition. The isolation extension inner cylinders 2 are used to effectively isolate the diode load from the pulse superimposed inner cylinders 1. The multiple coaxially sleeved pulse superimposed inner cylinders 1 and isolation extension inner cylinders 2 constitute a multi-stage transmission line inner cylinder 3. The length of each stage of the transmission line inner cylinder 3 is 2.5m-3m. The diameter of the inner cylinder 3 decreases gradually from front to back as the impedance changes. The outer wall of the connecting end of the inner cylinder 1 of the previous pulse superposition section or the inner cylinder 2 of the isolation extension section is provided with a circumferential annular groove and an annular boss at its end. The inner wall of the connecting end of the inner cylinder 1 of the next pulse superposition section or the inner cylinder 2 of the isolation extension section is provided with an annular insertion interface. The annular insertion interface is inserted into the connecting end of the inner cylinder 1 of the previous pulse superposition section or the inner cylinder 2 of the isolation extension section. The connecting ends of the inner cylinders 3 of adjacent transmission lines are provided with inner cylinder connecting devices 4, which include a connecting cover ring 5, a blind plate 6 and multiple axial fixing bolts 15.

[0040] like Figure 2 and Figure 3 As shown, the connecting cover ring 5 includes an upper half-moon cover plate 501 and a lower half-moon cover plate 502. Multiple screw holes 7 are provided on the outer circumferential surfaces of both the upper half-moon cover plate 501 and the lower half-moon cover plate 502. The upper half-moon cover plate 501 and the lower half-moon cover plate 502 are connected to each other by radial screws in the multiple screw holes 7, and are fixedly connected to the connecting end of the inner cylinder 1 of the preceding pulse superposition section or the inner cylinder 2 of the isolation extension section. An annular boss provided on the connecting end of the inner cylinder 1 of the preceding pulse superposition section or the inner cylinder 2 of the isolation extension section is fixedly connected to the connecting end of the inner cylinder 1 of the following pulse superposition section or the inner cylinder 2 of the isolation extension section axially by multiple axial fixing bolts 15, effectively ensuring the coaxiality between the inner cylinders 3 of adjacent transmission lines.

[0041] A fitting opening is provided at the connection end of the inner cylinder 1 of the next-stage pulse superposition section or the inner cylinder 2 of the isolation extension section to ensure the coaxiality and stability between the inner cylinder 1 of the previous-stage pulse superposition section or the inner cylinder 2 of the isolation extension section and the inner cylinder 1 of the next-stage pulse superposition section or the inner cylinder 2 of the isolation extension section.

[0042] like Figure 4 and Figure 5 As shown, blind plates 6 are provided at each screw hole 7 of the upper half-moon cover plate 501 and the lower half-moon cover plate 502 to ensure that the outer surface of the inner cylinder 3 of the transmission line is flat, to ensure that the two-stage inner cylinders 3 of the transmission line can make a smooth transition, and to prevent arcing between the inner and outer cylinders of the transmission line due to sharp corners.

[0043] Both the upper half-moon cover plate 501 and the lower half-moon cover plate 502 have T-shaped cross-sections, which can not only effectively reduce the weight of the connecting cover ring 5, but also ensure the strength of the inner cylinder connecting structure 4, making it less prone to deformation.

[0044] like Figure 7 As shown, a short-circuit connection device 8 is provided on the outer wall of the first-stage transmission line inner cylinder 3 in the multi-stage transmission line inner cylinder 3, for forming an electrical connection between the first-stage transmission line inner cylinder 3 and the inner wall 9 of the induction cavity on the transmission line; the short-circuit connection device 8 includes a loading ring 10 installed on the outer circumference of the front end of the first-stage pulse superposition section inner cylinder 1 and a... Figure 8 The stop spring 11 shown;

[0045] like Figure 9 As shown, the loading ring 10 includes two easily detachable semi-ring loading rings. The two semi-ring loading rings interlock to fix the short-circuit connection device 8 to the outer wall of the inner cylinder 3 of the first-stage transmission line. Annular mounting plates 12 are provided on the outer circumference of each of the two semi-ring loading rings. Grooves for installing stop springs 11 are formed on the outer circumference of the annular mounting plates 12. The stop springs 11 are installed in the grooves and abut against the inner wall 9 of the sensing cavity on the transmission line. The depth of the grooves can be designed according to the height of the stop springs 11, ensuring good electrical contact between the stop springs 11 and the inner wall 9 of the sensing cavity on the transmission line after installation. Furthermore, it ensures that the springs are not squeezed out when the secondary magnetically insulated transmission line is pushed or pulled, thus ensuring the stability of the stop spring installation. The stop springs 11 are made of beryllium copper, ensuring a good electrical connection between the inner cylinder 3 of the first-stage transmission line and the inner wall 9 of the sensing cavity on the transmission line.

[0046] The annular mounting plate 12 has multiple strip-shaped holes 13 along the circumferential direction on its annular surface to ensure the vacuum extraction efficiency between the inner cylinder 3 of the first-stage transmission line and the inner wall 9 of the induction cavity on the transmission line. The loading rings 10 located on both sides of the annular mounting plate 12 have multiple screw through holes 14 on their annular surfaces. Screws pass through the screw through holes 14 to fix the loading rings 10 to the outer wall of the inner cylinder 3 of the transmission line, so as to ensure that the loading rings 10 and the secondary magnetically insulated transmission line have good coaxiality and electrical connection.

Claims

1. An inner cylinder connection structure for a secondary magnetically insulated transmission line, the secondary magnetically insulated transmission line comprising multiple pulse superimposed segment inner cylinders (1) and multiple isolation extension segment inner cylinders (2) coaxially sleeved from front to back, the multiple coaxially sleeved pulse superimposed segment inner cylinders (1) and isolation extension segment inner cylinders (2) constituting a multi-stage transmission line inner cylinder (3); characterized in that: The outer wall of the connecting end of the inner cylinder (1) of the previous pulse superposition section or the inner cylinder (2) of the isolation extension section is provided with a circumferential annular groove, and its end is provided with an annular boss; the inner wall of the connecting end of the inner cylinder (1) of the next pulse superposition section or the inner cylinder (2) of the isolation extension section is provided with an annular insertion interface; the annular insertion interface is inserted into the connecting end of the inner cylinder (1) of the previous pulse superposition section or the inner cylinder (2) of the isolation extension section; It also includes a connecting cover ring (5), a blind plate (6), and multiple axial fixing bolts (15); The connecting cover ring (5) includes an upper half-moon cover plate (501) and a lower half-moon cover plate (502). Multiple screw holes (7) are provided on the outer circumferential surfaces of the upper half-moon cover plate (501) and the lower half-moon cover plate (502). The upper half-moon cover plate (501) and the lower half-moon cover plate (502) are connected to each other by radial screws in the multiple screw holes (7). The upper half-moon cover plate (501) and the lower half-moon cover plate (502) are fixedly connected to the connecting end of the inner cylinder (1) of the previous pulse superposition section or the inner cylinder (2) of the isolation extension section. Each screw hole (7) of the upper half-moon cover plate (501) and the lower half-moon cover plate (502) is provided with a blind plate (6) to ensure that the outer surface of the inner cylinder (3) of the transmission line is flat. The annular boss provided on the connecting end of the inner cylinder (1) of the previous pulse superposition section or the inner cylinder (2) of the isolation extension section is fixedly connected to the connecting end of the inner cylinder (1) of the next pulse superposition section or the inner cylinder (2) of the isolation extension section through multiple axial fixing bolts (15) to ensure the coaxiality between the inner cylinders (3) of the multi-stage transmission line.

2. The inner cylinder connection structure for a secondary magnetically insulated transmission line according to claim 1, characterized in that: A short-circuit connection device (8) is provided on the outer wall of the first-stage transmission line inner cylinder (3) in the multi-stage transmission line inner cylinder (3) to form an electrical connection between the first-stage transmission line inner cylinder (3) and the inner wall (9) of the induction cavity on the transmission line.

3. The inner cylinder connection structure for a secondary magnetically insulated transmission line according to claim 2, characterized in that: The short-circuit connection device (8) includes a loading ring (10) and a stop spring (11) installed on the outer circumference of the front end of the inner cylinder (1) of the first stage pulse superposition section. An annular mounting plate (12) is provided on the outer circumference of the loading ring (10). A groove for installing the stop spring (11) is opened on the outer circumference of the annular mounting plate (12). The stop spring (11) is installed in the groove and abuts against the inner wall (9) of the sensing cavity on the transmission line.

4. The inner cylinder connection structure for a secondary magnetically insulated transmission line according to claim 3, characterized in that: The annular mounting plate (12) has multiple strip holes (13) on its annular surface along the circumferential direction to ensure the vacuum extraction efficiency of the inner cylinder (3) of the transmission line.

5. The inner cylinder connection structure for a secondary magnetically insulated transmission line according to claim 1, characterized in that: A fitting port is provided at the connection end of the inner cylinder (1) of the next stage pulse superposition section or the inner cylinder (2) of the isolation extension section to ensure the coaxiality between the inner cylinder (1) of the previous stage pulse superposition section or the inner cylinder (2) of the isolation extension section and the inner cylinder (1) of the next stage pulse superposition section or the inner cylinder (2) of the isolation extension section.

6. The inner cylinder connection structure for a secondary magnetically insulated transmission line according to claim 4, characterized in that: The loading ring (10) comprises two half-ring loading rings; The two semi-ring loading rings interlock to fix the short-circuit connection device (8) on the outer wall of the inner cylinder (3) of the first-stage transmission line.

7. The inner cylinder connection structure for a secondary magnetically insulated transmission line according to claim 6, characterized in that: Multiple screw through holes (14) are provided on the ring surface of the loading ring (10) located on both sides of the annular mounting plate (12). The screws pass through the screw through holes (14) to fix the loading ring (10) to the outer wall of the inner cylinder (3) of the transmission line.

8. The inner cylinder connection structure for a secondary magnetically insulated transmission line according to claim 7, characterized in that: The stop spring (11) is made of beryllium copper.

9. The inner cylinder connection structure for a secondary magnetically insulated transmission line according to claim 1, characterized in that: The cross-sections of the upper half-moon cover plate (501) and the lower half-moon cover plate (502) are both T-shaped structures.

10. The inner cylinder connection structure for a secondary magnetically insulated transmission line according to claim 9, characterized in that: The length of the inner cylinder (3) of each transmission line is 2.5m-3m.

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