Vacuum switch tube for high voltage

Abstract

The invention discloses a vacuum switch tube for high voltage, and relates to the technical field of vacuum switch tubes. The ultrahigh vacuum switch comprises an airtight insulating shell, an electromagnetic repeller, a vacuum switch mechanism and an ultrahigh vacuum cavity, a fixed end cover plate and a fixed conducting rod are fixed on the airtight insulating shell, and a vacuum switch mechanism is assembled on the airtight insulating shell; an ultrahigh vacuum cavity is formed in the airtight insulating shell; the vacuum switch mechanism comprises a conductive connecting rod, a hinged connecting plate and a fixed hinged support; a fixed hinged support is hinged to the middle of the hinged connecting plate; one end part of the hinge connecting plate is fixedly connected with a conductive connecting rod, the other end part of the hinge connecting plate is fixedly provided with a swing column, and an electromagnetic repeller is assembled on the swing column; the electromagnetic repulsive device generates repulsive force through an electrified coil to control the swing operation of the swing column. Through the effects of the electromagnetic repeller and the vacuum switch mechanism, the vacuum degree and the insulating property are improved to a great extent by using the repulsive force to carry out air cut-off, and the vacuum switch has excellent insulating property and the effects of rapidly extinguishing arc and suppressing current.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum switch tubes, and in particular relates to a vacuum switch tube for high voltage. Background Art

[0002] Vacuum switch tubes are the core components of medium and high voltage power switches. Their main function is to quickly extinguish arcs and suppress current after the medium and high voltage circuits are cut off through the excellent insulation of the vacuum inside the tube, thus avoiding accidents and unexpected events. Vacuum switch tubes are mainly composed of vacuum sealed shells, contact systems, metal bellows and shielding covers. The vacuum sealed shell is usually made of ceramic or glass, maintaining a high vacuum degree inside. -4 -10 -6 Pa; It is mainly used in power transmission and distribution control systems, and is also used in power distribution systems in metallurgy, mining, petroleum, chemical industry, railways, broadcasting, communications, industrial high-frequency heating, etc.

[0003] The structural design of the vacuum switch tube is to take advantage of the characteristics of high vacuum as an excellent insulating medium, so that when the high voltage circuit is cut off from the power supply, the arc can be extinguished quickly and the current can be suppressed. The higher the vacuum level in the vacuum switch tube, the better the insulation effect. At the same time, due to the high vacuum maintained in the tube for 10 -4 Pa or higher, while the external pressure is atmospheric, subjecting the seals in the vacuum switch tube to continuous mechanical stress, which can easily cause material creep or fatigue cracking. The pressure differential can also drive gas penetration or micro-leakage, accelerating the aging of organic sealing materials such as rubber or intergranular corrosion of metal seals. This can lead to a decrease in vacuum, which directly weakens the insulation strength. Residual gas under high voltage can be ionized, triggering field emission or micro-discharge, resulting in a decrease in the insulation breakdown voltage, ultimately causing the vacuum switch tube to fail.

[0004] Therefore, the insulation performance of a high-voltage vacuum switch tube primarily depends on the vacuum level within the tube. The seals used in high-voltage vacuum switch tubes, in turn, limit the upper limit of the vacuum level within the tube. This significantly limits the insulation performance of the high-voltage vacuum switch tube due to the sealing performance of the seals. To address the aforementioned issue of the insulation performance of high-voltage vacuum switch tubes being limited by the sealing performance of the seals, the present invention designs a high-voltage vacuum switch tube. Summary of the Invention

[0005] The object of the present invention is to provide a vacuum switch tube for high voltage, which uses the repulsive force to control the swing operation of the swing column in the air through the action of an electromagnetic repeller and a vacuum switch mechanism, omitting the structural design of direct operation of the seal, greatly improving the vacuum degree and insulation performance inside the vacuum switch tube, and having excellent insulation performance and the effect of quickly extinguishing the arc and suppressing the current; thereby solving the above-mentioned problems.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention relates to a high-voltage vacuum switch tube, comprising an airtight insulating housing, an electromagnetic repeller, a vacuum switch mechanism, and an ultra-high vacuum chamber. Fixed end covers and fixed conductive rods are fixed to both ends of the airtight insulating housing, and a vacuum switch mechanism is mounted between the two fixed conductive rods within the airtight insulating housing. The interior of the airtight insulating housing is configured as an ultra-high vacuum chamber. The vacuum switch mechanism comprises a conductive connecting rod, a hinged connecting plate, and a fixed hinge seat. The hinged connecting plate is an L-shaped bent plate structure, and a fixed hinge seat is hingedly connected to the middle of the hinged connecting plate. The conductive connecting rod is fixedly connected to one end of the hinged connecting plate, and a swing column is fixed to the other end of the hinged connecting plate. The electromagnetic repeller controls the swing column's swinging operation by generating a repulsive force using an energized coil or a permanent magnet, thereby controlling the conductive connecting rod on one end of the hinged connecting plate to swing, thereby achieving an on-off state between the conductive connecting rod and the two fixed conductive rods. The ultra-high vacuum chamber within the airtight insulating housing is in an ultra-vacuum state, and the ultra-high vacuum maintained within the ultra-high vacuum chamber is 10 - 6 Pa or above; since the present invention abandons the structural design of the seal, its insulation performance will no longer be limited by the sealing performance of the seal.

[0008] As a preferred technical solution of the present invention, the electromagnetic repeller includes an opposed coil group, a fixed seat and a sliding seat; the opposed coil group includes two coaxial parallel coils, which are arranged symmetrically; the two coaxial parallel coils in the opposed coil group are fixedly installed inside the fixed seat and the sliding seat respectively; the wires of the opposed coil group are connected to two groups of electrode columns; two groups of electrode columns are provided on the airtight insulating shell, and the electrode columns all pass through the airtight insulating shell; when the power supply outside the airtight insulating shell connects currents in opposite directions to the two coaxial parallel coils through the two groups of electrode columns, the electromagnetic repeller indirectly controls the conductive connecting rod to detach from the position between the two fixed conductive rods through the hinged connecting plate, thereby realizing the operation of cutting off the high-voltage circuit.

[0009] As a preferred technical solution of the present invention, the fixed seat is fixedly installed on the inner wall of the airtight insulating shell; the fixed seat is provided with guide slides at both ends of the sliding seat; guide columns are fixed on the two end surfaces of the sliding seat; the guide columns and the guide slides are vertically slid together; the sliding seat limits the direction of movement so that it can perform vertical lifting and sliding, thereby ensuring the stability of the sliding direction and the repulsive force.

[0010] As a preferred technical solution of the present invention, a sliding bracket is provided on the top of the sliding seat; an elliptical limiting slot is provided at both ends of the sliding bracket of the sliding seat; the inner bottom surface of the sliding bracket is in contact with the other end of the hinged connecting plate; the inner wall of the elliptical limiting slot is in sliding cooperation with the two ends of the rocking column.

[0011] As a preferred technical solution of the present invention, the sliding seat is evenly fixed with a plurality of reinforcing ribs on one side of the sliding bracket; the function of the reinforcing ribs is to strengthen the overall structural strength of the sliding seat.

[0012] As a preferred technical solution of the present invention, a fixed contact is fixed to one relative inner end of the two fixed conductive rods; a moving contact is fixed to both ends of the conductive connecting rod; the fixed contact and the moving contact are in contact or disengagement state; the function of the fixed contact and the moving contact is to ensure the stability of the path.

[0013] As a preferred technical solution of the present invention, it also includes an electromagnetic lock; the electromagnetic lock includes a conductive coil and a metal armature; the metal armature is fixedly installed on the peripheral side of the conductive connecting rod; the inner wall of the airtight insulating shell is fixedly installed with a conductive coil at a position in contact with the conductive connecting rod; the conductive coil generates a strong magnetic field when energized, magnetizing the iron core and adsorbing the metal armature; the function of the electromagnetic lock is to ensure the position stability of the conductive connecting rod after the high-voltage circuit is cut off from the power supply, and avoid the problem of incomplete circuit breaking caused by rebound, and also ensure the effect of rapid arc extinguishing and current suppression after the power supply is cut off.

[0014] As a preferred technical solution of the present invention, a torsion spring is installed between the hinged connecting plate and the fixed hinge seat; the torsion spring is used to reset the hinged connecting plate; after the electromagnetic lock is powered off, the torsion spring resets the hinged connecting plate until the conductive connecting rod is squeezed into contact between the two fixed conductive rods; if the elastic force of the torsion spring is insufficient, the power supply outside the airtight insulating shell can also connect the two coaxial parallel coils with current in the same direction through two groups of electrode columns, and the electromagnetic repeller indirectly provides a force for the conductive connecting rod to be squeezed into the position between the two fixed conductive rods through the hinged connecting plate, thereby realizing the operation of the high-voltage circuit path.

[0015] As a preferred technical solution of the present invention, a limiting column is fixed on the fixed hinge seat, and the limiting column is used to limit the rotation angle range between the hinged connecting plate and the fixed hinge seat; the function of the limiting column is to prevent the conductive connecting rod from continuing to rotate and detach after being squeezed into between the two fixed conductive rods; so that after the two ends of the conductive connecting rod are squeezed into between the two fixed conductive rods, the fixed contact and the moving contact are in perfect contact.

[0016] The present invention has the following beneficial effects:

[0017] 1. The present invention utilizes the repulsive force to remotely control the swinging operation of the swing column through the action of the electromagnetic repeller and the vacuum switch mechanism, omitting the structural design of direct operation of the seal, greatly improving the vacuum degree and insulation performance inside the vacuum switch tube, and having excellent insulation performance and the effect of quickly extinguishing arcs and suppressing current.

[0018] 2. The present invention uses the effect of the electromagnetic repeller, and its repulsive force decays faster as the distance increases. Therefore, when the conductive connecting rod and the two fixed conductive rods are in a connected state, the distance between the two coaxial parallel coils in the electromagnetic repeller is small, and the repulsive force generated is large, which is conducive to the function of rapid cutting off; when the conductive connecting rod and the two fixed conductive rods are in a disconnected state, the distance between the two coaxial parallel coils in the electromagnetic repeller increases, and the repulsive force generated is reduced; it can also reduce the collision impact of the conductive connecting rod on the inner wall of the airtight insulating shell and the electromagnetic lock after swinging.

[0019] 3. The present invention ensures the position stability of the conductive connecting rod after the high-voltage circuit is cut off from the power supply through the electromagnetic lock, thereby avoiding the problem of incomplete circuit breaking caused by rebound, and also ensures the effect of rapid arc extinguishing and current suppression after the power supply is cut off.

[0020] 4. The present invention facilitates the resetting of the conductive connecting rod through the action of the limit column and the torsion spring, and ensures the spatial range of the conductive connecting rod's activity, thereby improving the stability of the vacuum switch tube operation.

[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a cross-sectional view of the internal structure of a vacuum switch tube for high voltage according to the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of a vacuum switch tube for high voltage in a flow state according to the present invention;

[0025] Figure 3 for Figure 2 A perspective view of the structure from a side view;

[0026] Figure 4This is a schematic diagram of the internal structure of a vacuum switch tube for high voltage in a cut-off state according to the present invention;

[0027] Figure 5 for Figure 4 A perspective view of the structure from a side view;

[0028] Figure 6 A perspective view of the internal structure of the airtight insulating housing and the electromagnetic repeller of the present invention;

[0029] Figure 7 A partial structural perspective view of the fixed hinge seat and the electromagnetic repeller of the present invention;

[0030] Figure 8 It is a structural schematic diagram of the sliding seat of the present invention;

[0031] Figure 9 It is a structural schematic diagram of the conductive connecting rod and the hinged connecting plate of the present invention;

[0032] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0033] 1-airtight insulating shell, 2-electromagnetic repeller, 3-vacuum switch mechanism, 4-ultra-high vacuum chamber, 5-electromagnetic lock, 101-fixed end cover, 102-fixed conductive rod, 103-fixed contact, 201-opposed coil group, 202-fixed seat, 203-sliding seat, 204-electrode column, 205-guide slide, 206-guide column, 207-sliding bracket, 208-elliptical limit slide, 209-reinforcement rib, 301-conductive connecting rod, 302-hinge connecting plate, 303-fixed hinge seat, 304-swing column, 305-moving contact, 306-limiting column, 501-conductive coil, 502-metal armature. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1-9As shown, the present invention is a vacuum switch tube for high voltage, comprising an airtight insulating shell 1, an electromagnetic repeller 2, a vacuum switch mechanism 3 and an ultra-high vacuum chamber 4; fixed end covers 101 and fixed conductive rods 102 are fixed at both ends of the airtight insulating shell 1, and a vacuum switch mechanism 3 is assembled between the two fixed conductive rods 102 inside the airtight insulating shell 1; the interior of the airtight insulating shell 1 is provided with an ultra-high vacuum chamber 4; the vacuum switch mechanism 3 comprises a conductive connecting rod 301, a hinged connecting plate 302 and a fixed hinge seat 303; the hinged connecting plate 302 is an L-shaped bent plate structure, and a fixed hinge is hinged in the middle of the hinged connecting plate 302. Seat 303; one end of the hinged connecting plate 302 is fixedly connected to a conductive connecting rod 301, and the other end of the hinged connecting plate 302 is fixed to a swing column 304, and the swing column 304 is equipped with an electromagnetic repeller 2; the electromagnetic repeller 2 uses a powered coil or a permanent magnet to generate a repulsive force to control the swing operation of the swing column 304, and then controls the conductive connecting rod 301 on one end of the hinged connecting plate 302 to swing, thereby realizing the on-off state between the conductive connecting rod 301 and the two fixed conductive rods 102; the ultra-high vacuum chamber 4 inside the airtight insulating shell 1 is in an ultra-vacuum state, and the ultra-high vacuum degree 10 maintained in the ultra-high vacuum chamber 4 -6 Pa or more; Since the present invention abandons the structural design of the seal, its insulation performance will no longer be limited by the sealing performance of the seal; the vacuum degree inside the ultra-high vacuum chamber 4 of the present invention mainly depends on the vacuum degree that can be achieved at the current industrial level 10 -7 -10 -9 Pa; therefore, the insulation performance of a high-voltage vacuum switch tube of the present invention has the advantage of significantly improving compared to existing high-voltage vacuum switch tubes; the airtight insulating housing 1 and the fixed end cover 101 adopt an integrated structure.

[0037] Among them Figure 6-8 As shown, the electromagnetic repeller 2 includes an opposed coil group 201, a fixed seat 202 and a sliding seat 203; the opposed coil group 201 includes two coaxial parallel coils, which are arranged symmetrically; the two coaxial parallel coils in the opposed coil group 201 are fixedly installed inside the fixed seat 202 and the sliding seat 203 respectively; the opposed coil group 201 is connected to two groups of electrode columns 204 by wires; two groups of electrode columns 204 are provided on the airtight insulating shell 1, and the electrode columns 204 all pass through the airtight insulating shell 1; when the power supply outside the airtight insulating shell 1 connects currents in opposite directions to the two coaxial parallel coils through the two groups of electrode columns 204, the electromagnetic repeller 2 indirectly controls the conductive connecting rod 301 to separate from the position between the two fixed conductive rods 102 through the hinged connecting plate 302, thereby realizing the operation of cutting off the high-voltage circuit.

[0038] Among them Figure 7-8As shown, the fixed seat 202 is fixedly installed on the inner wall of the airtight insulating shell 1; the fixed seat 202 is provided with guide slides 205 at both ends of the sliding seat 203; guide columns 206 are fixed to the two end surfaces of the sliding seat 203; the guide columns 206 and the guide slides 205 are vertically slidably matched; the sliding seat 203 limits the direction of movement, so that it can perform vertical lifting and sliding, thereby ensuring the stability of the sliding direction and the repulsive force.

[0039] Among them Figure 8 As shown, a sliding bracket 207 is provided on the top of the sliding seat 203; the sliding seat 203 is provided with elliptical limiting grooves 208 at both ends of the sliding bracket 207; the inner bottom surface of the sliding bracket 207 is in contact with the other end of the hinged connecting plate 302; the inner wall of the elliptical limiting groove 208 is in sliding cooperation with the two ends of the rocking column 304; the sliding seat 203 is evenly fixed with a number of reinforcing ribs 209 on one side of the sliding bracket 207; the electromagnetic repeller 2 will also be designed with matching magnetic shielding, magnetic circuit guide structures, etc., to guide the magnetic field path and reduce magnetic leakage, etc.

[0040] Among them Figure 1-2 As shown, a fixed contact 103 is fixed to one relative inner end of the two fixed conductive rods 102; a moving contact 305 is fixed to both ends of the conductive connecting rod 301; the fixed contact 103 and the moving contact 305 are in contact or disengagement state; the function of the fixed contact 103 and the moving contact 305 is to ensure the stability of the passage.

[0041] Example 2

[0042] A more preferred technical solution based on Example 1 is as follows: Figure 2-5 As shown, it also includes an electromagnetic lock 5; the electromagnetic lock 5 includes a conductive coil 501 and a metal armature 502; the metal armature 502 is fixedly mounted on the side surface of the conductive connecting rod 301; the inner wall of the airtight insulating shell 1 is fixedly mounted with a conductive coil 501 at a position in contact with the conductive connecting rod 301; when the conductive coil 501 is energized, the coil generates a strong magnetic field, magnetizing the iron core and adsorbing the metal armature 502; the function of the electromagnetic lock 5 is to ensure the position stability of the conductive connecting rod 301 after the high-voltage circuit is cut off from the power supply, and to avoid the problem of incomplete circuit breaking due to rebound, and also to ensure the effect of rapid arc extinguishing and current suppression after the power supply is cut off; the airtight insulating shell 1, the fixed end cover 101, the fixed conductive rod 102 and the electrode column 204 adopt an integrated structure.

[0043] Among them Figure 3 and Figure 5As shown, a torsion spring is installed between the hinged connecting plate 302 and the fixed hinge seat 303; the torsion spring is used to reset the hinged connecting plate 302; after the electromagnetic lock 5 is powered off, the torsion spring resets the hinged connecting plate 302 until the conductive connecting rod 301 is squeezed and in contact between the two fixed conductive rods 102; if the elastic force of the torsion spring is insufficient, the power supply outside the airtight insulating shell 1 can also connect the two coaxial parallel coils with current in the same direction through the two groups of electrode columns 204, and the electromagnetic repeller 2 indirectly provides a force for the conductive connecting rod 301 to squeeze into the position between the two fixed conductive rods 102 through the hinged connecting plate 302, thereby realizing the operation of the high-voltage circuit path.

[0044] Among them Figure 3 and Figure 5 As shown, a limiting column 306 is fixed on the fixed hinge seat 303, and the limiting column 306 is used to limit the rotation angle range between the hinge plate 302 and the fixed hinge seat 303; the function of the limiting column 306 is to prevent the conductive connecting rod 301 from continuing to rotate and detach after being squeezed into between the two fixed conductive rods 102; so that after the two ends of the conductive connecting rod 301 are squeezed into between the two fixed conductive rods 102, the fixed contact 103 and the moving contact 305 are in perfect contact.

[0045] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0046] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A vacuum switch tube for high voltage, comprising a gas-tight insulating housing (1) and an electromagnetic repeller (2); characterized in that: It also includes a vacuum switch mechanism (3) and an ultra-high vacuum chamber (4); Fixed end covers (101) and fixed conductive rods (102) are fixed to both ends of the airtight insulating housing (1), and a vacuum switch mechanism (3) is installed between the two fixed conductive rods (102) inside the airtight insulating housing (1); the interior of the airtight insulating housing (1) is provided as an ultra-high vacuum chamber (4); The vacuum switch mechanism (3) comprises a conductive connecting rod (301), a hinged connecting plate (302) and a fixed hinge seat (303); the hinged connecting plate (302) is an L-shaped bent plate structure, and the fixed hinge seat (303) is hingedly connected to the middle of the hinged connecting plate (302); one end of the hinged connecting plate (302) is fixedly connected to the conductive connecting rod (301), and the other end of the hinged connecting plate (302) is fixed to a swing column (304), and the swing column (304) is equipped with an electromagnetic repeller (2); The electromagnetic repeller (2) uses an energized coil or a permanent magnet to generate a repulsive force to control the swing operation of the swing column (304).

2. A vacuum switch tube for high voltage according to claim 1, characterized in that: The electromagnetic repeller (2) comprises an opposed coil group (201), a fixed seat (202) and a sliding seat (203); the opposed coil group (201) comprises two coaxial parallel coils, which are symmetrically arranged; the two coaxial parallel coils in the opposed coil group (201) are fixedly mounted inside the fixed seat (202) and the sliding seat (203), respectively; the opposed coil group (201) is connected to two groups of electrode columns (204) by wires; the airtight insulating shell (1) is provided with two groups of electrode columns (204), and the electrode columns (204) all penetrate the airtight insulating shell (1).

3. A vacuum switch tube for high voltage according to claim 2, characterized in that: The fixed seat (202) is fixedly mounted on the inner wall of the airtight insulating housing (1); the fixed seat (202) is provided with guide slideways (205) at both ends of the sliding seat (203); guide columns (206) are fixed to both end surfaces of the sliding seat (203); the guide columns (206) and the guide slideways (205) are vertically slidably matched.

4. A vacuum switch tube for high voltage according to claim 3, characterized in that: The top of the sliding seat (203) is provided with a sliding bracket (207); the sliding seat (203) is provided with elliptical limiting sliding grooves (208) at both ends of the sliding bracket (207); the inner bottom surface of the sliding bracket (207) is in contact with the other end of the hinged connecting plate (302); the inner wall of the elliptical limiting sliding groove (208) is in sliding cooperation with the two ends of the swing column (304).

5. A vacuum switch tube for high voltage according to claim 4, characterized in that: The sliding seat (203) is evenly fixed with a plurality of reinforcing ribs (209) on one side of the sliding bracket (207).

6. A vacuum switch tube for high voltage according to claim 1, characterized in that: Fixed contacts (103) are fixed to opposite inner ends of the two fixed conductive rods (102); movable contacts (305) are fixed to both ends of the conductive connecting rod (301); and the fixed contacts (103) and the movable contacts (305) are in a contact-matching or disengagement state.

7. The vacuum switch tube for high voltage according to claim 1, characterized in that: The invention also includes an electromagnetic lock (5); the electromagnetic lock (5) includes a conductive coil (501) and a metal armature (502); the metal armature (502) is fixedly mounted on the peripheral side of the conductive connecting rod (301); the inner wall of the airtight insulating housing (1) is fixedly mounted with a conductive coil (501) at a position in contact with the conductive connecting rod (301); when the conductive coil (501) is energized, the coil generates a strong magnetic field, magnetizing the iron core and adsorbing the metal armature (502).

8. The vacuum switch tube for high voltage according to claim 1, characterized in that: A torsion spring is installed between the hinge connecting plate (302) and the fixed hinge seat (303); the torsion spring is used to reset the hinge connecting plate (302).

9. The vacuum switch tube for high voltage according to claim 1, characterized in that: A limiting column (306) is fixed on the fixed hinge seat (303), and the limiting column (306) is used to limit the rotation angle range between the hinge connecting plate (302) and the fixed hinge seat (303).

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