A guide block and fixing structure for a vacuum interrupter

Abstract

This utility model discloses a guide block and fixing structure for a vacuum interrupter, including: a cavity structure, wherein a fixing structure is slidably connected to the outer wall of the cavity structure; this utility model relates to the field of vacuum interrupter technology. The cavity structure and the fixing structure, through the coaxial constraint of the guide block and the guide groove, ensure that the arc is always generated in the axial region of the two contacts, which is within the coverage of the shield. The synergistic effect of the guide block and the guide groove ensures that the moving contact and the fixed contact are always separated or in contact along the axial line, avoiding problems such as "one-sided contact" and "misaligned contact". The pressure plate and the fixing plate are pressed onto the top of the connecting seat and the bottom of the fixing seat respectively by the fixing screw rod, so that the entire cavity structure forms a rigid connection with the external equipment. When opening and closing the circuit, even if the moving conductive rod is subjected to upward pulling force or downward pushing force, the whole device will not undergo lateral displacement or shaking.

Description

Technical Field

[0001] This utility model relates to the field of vacuum interrupter technology, specifically to a vacuum interrupter guide block and fixing structure. Background Technology

[0002] In power systems, vacuum interrupters are core components of high-voltage switchgear, and their performance directly affects the safe and stable operation of the power system. Vacuum interrupters mainly rely on the opening and closing action of contacts in a vacuum to realize the switching of circuits. Therefore, the accuracy of contact movement, conductivity reliability, contact reliability, and overall structural stability are crucial. However, existing vacuum interrupters often face some problems in actual operation.

[0003] During the opening and closing of the contacts, due to the lack of effective guiding constraints, the moving conductive rod is prone to radial displacement or torsion, resulting in one-sided contact or misaligned contact between the moving contact and the fixed contact. This not only increases the contact resistance and causes overheating of the contact area, but also causes the arc to deviate from the effective coverage of the shield, affecting the arc extinguishing efficiency. At the same time, it exacerbates the uneven wear of the contacts and shortens their service life. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a vacuum interrupter guide block and fixing structure, which solves the problem that the moving conductive rod is prone to radial displacement or torsion during the contact opening and closing process due to the lack of effective guiding constraints.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A guide block and fixing structure for a vacuum interrupter include: a cavity structure, with a fixing structure slidably connected to the outer wall of the cavity structure; the cavity structure includes a fixing seat, with a fixed conductive rod slidably connected to the inner wall of the fixing seat, a fixed contact fixedly connected to the outer wall of the top of the fixed conductive rod, a connecting seat above the fixing seat, a movable conductive rod slidably connected to the inner wall of the connecting seat, a movable contact fixedly connected to the outer wall of the bottom of the movable conductive rod, guide blocks fixedly connected to the outer walls of both the movable contact and the fixed contact, a positioning plate fixedly connected to the outer wall of the movable conductive rod, and a compression spring fixedly connected to the outer wall of the top of the positioning plate.

[0009] Preferably, the fixed conductive rod is slidably inserted into the inner wall of the fixed seat and then welded and fixed. The guide blocks are arranged in a ring around the central point of the moving contact and the fixed contact. The outer wall of the compression spring on the side away from the positioning plate is fixedly connected to the outer wall of the bottom of the connecting seat. The outer wall of the bottom of the moving contact is in contact with the outer wall of the top of the fixed contact. Opening and closing are achieved through the contact between the moving contact and the fixed contact.

[0010] Preferably, an insulating shell is bonded to the outer wall of the top of the fixing base, a shielding cover is provided inside the insulating shell, a guide sleeve is slidably connected to the inner wall of the shielding cover, and a guide groove is formed on the inner wall of the guide sleeve.

[0011] Preferably, the guide grooves are arranged in a ring around the central point of the guide sleeve. The outer wall of the top of the insulating shell is bonded to the outer wall of the bottom of the connecting seat. The inner wall of the bottom of the shielding cover is slidably connected to the outer wall of the fixed conductive rod. The outer wall of the bottom of the shielding cover is in contact with and bonded to the outer wall of the top of the fixed seat. The outer wall of the bottom of the guide sleeve is bonded to the inner wall of the bottom of the shielding cover. The inner wall of the guide groove is slidably connected to the outer wall of the guide block. The sliding cooperation between the guide block and the guide groove provides a forced coaxial guiding effect, preventing the moving conductive rod from radially shifting due to external force or vibration, and ensuring that the moving contact and the fixed contact always open and close along the central axis.

[0012] Preferably, the fixing structure includes a fixing screw rod, the outer wall of which is slidably connected to a pressure plate and a fixing plate, and the outer wall of which is threadedly connected to a nut.

[0013] Preferably, the fixing screws are symmetrically arranged on both sides of the pressure plate and the fixing plate. The inner wall of the pressure plate is slidably connected to the outer wall of the movable conductive rod. The outer wall of the bottom of the pressure plate is in contact with the outer wall of the top of the connecting seat. The inner wall of the fixing plate is slidably connected to the outer wall of the bottom of the fixed conductive rod. The outer wall of the top of the fixing plate is in contact with the outer wall of the bottom of the fixing seat. The pressure plate is pressed against the top of the connecting seat by fixing screws and nuts. The fixing plate is also pressed against the bottom of the fixing seat by fixing screws and nuts, thereby achieving rigid fixation of the entire device in the external equipment.

[0014] (III) Beneficial Effects

[0015] This utility model provides a guide block and fixing structure for a vacuum interrupter. It has the following beneficial effects:

[0016] (i) The cavity structure, through the coaxial constraint of the guide block and the guide groove, ensures that the electric arc is always generated in the axial region of the two contacts. This region is within the coverage of the shield. The synergistic effect of the guide block and the guide groove ensures that the moving contact and the fixed contact are always separated or in contact along the axial line, avoiding problems such as "one-sided contact" and "misaligned contact". The full fit of the contacts not only reduces the contact resistance, but also reduces the conductive loss caused by insufficient contact area, ensuring that the current conduction path is smooth and improving the overall conductivity efficiency.

[0017] (ii) The fixed structure presses the pressure plate and the fixing plate onto the top of the connecting seat and the bottom of the fixing seat respectively by fixing screw rods, so that the entire cavity structure forms a rigid connection with the external equipment. When the circuit is opened and closed, even if the moving conductive rod is subjected to upward pulling force or downward pushing force, the whole device will not be laterally displaced or shaken, ensuring that the arc extinguishing chamber is accurately positioned in the equipment and avoiding circuit connection misalignment caused by structural offset. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the insulating shell of this utility model;

[0021] Figure 4 This is a schematic diagram of the fixing structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the internal structure of the shielding cover of this utility model.

[0023] In the diagram: 1. Cavity structure; 11. Fixing seat; 12. Fixing conductive rod; 13. Fixing contact; 14. Connecting seat; 15. Moving conductive rod; 16. Moving contact; 17. Guide block; 18. Positioning plate; 19. Compression spring; 191. Insulating shell; 192. Shielding cover; 193. Guide sleeve; 194. Guide groove; 2. Fixing structure; 21. Fixing screw rod; 22. Pressure plate; 23. Fixing plate; 24. Nut. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5 This utility model provides a technical solution: a guide block and fixing structure for a vacuum interrupter, comprising: a cavity structure 1, with a fixing structure 2 slidably connected to the outer wall of the cavity structure 1; the cavity structure 1 includes a fixing seat 11, with a fixed conductive rod 12 slidably connected to the inner wall of the fixing seat 11, a fixed contact 13 fixedly connected to the outer wall of the top of the fixed conductive rod 12, a connecting seat 14 above the fixing seat 11, a movable conductive rod 15 slidably connected to the inner wall of the connecting seat 14, a movable contact 16 fixedly connected to the outer wall of the bottom of the movable conductive rod 15, a guide block 17 fixedly connected to the outer walls of both the movable contact 16 and the fixed contact 13, a positioning plate 18 fixedly connected to the outer wall of the movable conductive rod 15, and a compression spring 19 fixedly connected to the outer wall of the top of the positioning plate 18.

[0026] After the fixed conductive rod 12 is slidably inserted into the inner wall of the fixed base 11, it is welded and fixed. The guide block 17 is arranged in a ring along the central point of the moving contact 16 and the fixed contact 13. The outer wall of the compression spring 19 on the side away from the positioning plate 18 is fixedly connected to the outer wall of the bottom of the connecting base 14. The outer wall of the bottom of the moving contact 16 is in contact with the outer wall of the top of the fixed contact 13. The opening and closing are achieved through the contact between the moving contact 16 and the fixed contact 13.

[0027] An insulating shell 191 is bonded to the outer wall of the top of the fixed base 11. A shielding cover 192 is provided inside the insulating shell 191. A guide sleeve 193 is slidably connected to the inner wall of the shielding cover 192. A guide groove 194 is provided on the inner wall of the guide sleeve 193.

[0028] The guide groove 194 is arranged in a ring around the central point of the guide sleeve 193. The outer wall of the top of the insulating shell 191 is bonded to the outer wall of the bottom of the connecting seat 14. The inner wall of the bottom of the shield 192 is slidably connected to the outer wall of the fixed conductive rod 12. The outer wall of the bottom of the shield 192 is in contact with and bonded to the outer wall of the top of the fixed seat 11. The outer wall of the bottom of the guide sleeve 193 is bonded to the inner wall of the bottom of the shield 192. The inner wall of the guide groove 194 is slidably connected to the outer wall of the guide block 17. The sliding cooperation between the guide block 17 and the guide groove 194 plays a forced coaxial guiding role, preventing the moving conductive rod 15 from radially deviating due to external force or vibration, and ensuring that the moving contact 16 and the fixed contact 13 always open and close along the axis.

[0029] The fixing structure 2 includes a fixing screw rod 21, a pressure plate 22 and a fixing plate 23 are slidably connected to the outer wall of the fixing screw rod 21, and a nut 24 is threadedly connected to the outer wall of the fixing screw rod 21.

[0030] The fixing screw rods 21 are symmetrically arranged on both sides of the pressure plate 22 and the fixing plate 23. The inner wall of the pressure plate 22 is slidably connected to the outer wall of the movable conductive rod 15. The outer wall of the bottom of the pressure plate 22 is in contact with the outer wall of the top of the connecting seat 14. The inner wall of the fixing plate 23 is slidably connected to the outer wall of the bottom of the fixed conductive rod 12. The outer wall of the top of the fixing plate 23 is in contact with the outer wall of the bottom of the fixing seat 11. The pressure plate 22 is pressed against the top of the connecting seat 14 by the fixing screw rods 21 and the nuts 24. Similarly, the fixing plate 23 is pressed against the bottom of the fixing seat 11 by the fixing screw rods 21 and the nuts 24, so as to achieve rigid fixation of the entire device in the external equipment.

[0031] During use, the cavity structure 1 is assembled and fixed by the fixing structure 2, so that the entire device is rigidly connected to the external equipment, thus preventing the device from shaking when opening and closing the circuit.

[0032] After the fixed conductive rod 12 is slidably inserted into the inner wall of the fixed base 11 and fixed by welding, it forms a rigid support for the static end conductive path and provides a fixed access end for the circuit. The inner wall of the connecting base 14 is slidably adapted to the movable conductive rod 15 to form a movable channel for the moving end conductive path, realizing the opening and closing of the circuit. The insulating shell 191 is connected to the top of the fixed base 11 and the bottom of the connecting base 14 by bonding to form a closed insulating cavity. The shielding cover 192 is bonded to the top of the fixed base 11 and its inner wall is adapted to the fixed conductive rod 12. The guide sleeve 193 is bonded to the bottom inner wall of the shielding cover 192. The three together construct an internal environment of "insulation + shielding + guidance" to avoid arc leakage and reduce electric field distortion.

[0033] The movable contact 16 and the fixed contact 13 are in contact with each other in the initial state, forming a contact pair that is initially conducting. Both of them have guide blocks 17 arranged in a ring on their outer walls, and the outer wall of the guide block 17 is slidably connected to the guide groove 194 on the inner wall of the guide sleeve 193. The ring array design of the guide block 17 and the guide groove 194 ensures that the contact pair is in a coaxial position when initially contacting each other, avoiding misalignment.

[0034] A compression spring 19 is fixed to the top of the positioning plate 18 on the outer wall of the movable conductive rod 15. The other end of the compression spring 19 is bonded to the bottom of the connecting seat 14. At this time, the compression spring 19 is in a slightly stretched state, providing a downward preload for the movable conductive rod 15, ensuring the initial contact pressure between the movable contact 16 and the fixed contact 13.

[0035] In the fixed structure 2, the pressure plate 22 is pressed onto the top of the connecting seat 14 by the fixing screw rod 21 and the nut 24, and the fixing plate 23 is also pressed onto the bottom of the fixing seat 11 by the fixing screw rod 21 and the nut 24, so as to achieve rigid fixation of the entire device in the external equipment and prevent overall displacement.

[0036] The movable conductive rod 15 is externally connected to a hydraulic mechanism. When the upward pulling force overcomes the preload of the compression spring 19, the movable conductive rod 15 slides upward along the inner wall of the connecting seat 14. At this time, the movable contact 16 moves upward synchronously with the movable conductive rod 15 and gradually separates from the fixed contact 13. During the separation process, the guide block 17 on the outer wall of the movable contact 16 always slides along the guide groove 194 of the guide sleeve 193. The guide block 17 on the outer wall of the fixed contact 13 remains in the guide groove 194 because the fixed contact 13 is stationary. The sliding cooperation between the guide block 17 and the guide groove 194 plays a forced coaxial guiding role, which avoids the movable conductive rod 15 from radially deviating due to external force or vibration, and ensures that the movable contact 16 and the fixed contact 13 are always separated along the axis, preventing the contact edge from being damaged by collision. At the same time, it ensures that the electric arc is always generated in the axial region of the two contacts during the separation process, which is convenient for the shield 192 to absorb the electric arc energy and cool the electric arc.

[0037] When the movable conductive rod 15 slides upward, the positioning plate 18 moves upward synchronously, and the compression spring 19 is further compressed. When the movable conductive rod 15 slides to the preset opening position, the tension disappears, and the elastic potential energy of the compression spring 19 can temporarily maintain the opening position of the movable conductive rod 15 to avoid accidental contact overlap due to vibration. When the movable contact 16 and the fixed contact 13 separate to a certain distance, the electric arc between the contacts is quickly extinguished in the vacuum environment, and the circuit is cut off.

[0038] When the external operating mechanism applies a downward pushing force to the movable conductive rod 15, the movable conductive rod 15 slides down along the inner wall of the connecting seat 14. After the contacts make contact, the current flows from the fixed conductive rod 12 to the fixed contact 13, then to the movable contact 16, and finally to the movable conductive rod 15 to form a conductive loop, and the circuit is restored to power supply.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum interrupter guide block and fixing structure, characterized by, include: The cavity structure (1) has a fixed structure (2) slidably connected to its outer wall. The cavity structure (1) includes a fixed seat (11), a fixed conductive rod (12) is slidably connected to the inner wall of the fixed seat (11), a fixed contact (13) is fixedly connected to the outer wall of the top of the fixed conductive rod (12), a connecting seat (14) is provided above the fixed seat (11), a movable conductive rod (15) is slidably connected to the inner wall of the connecting seat (14), a movable contact (16) is fixedly connected to the outer wall of the bottom of the movable conductive rod (15), a guide block (17) is fixedly connected to the outer walls of both the movable contact (16) and the fixed contact (13), a positioning plate (18) is fixedly connected to the outer wall of the movable conductive rod (15), and a compression spring (19) is fixedly connected to the outer wall of the top of the positioning plate (18).

2. The guiding block and fixing structure of vacuum interrupter according to claim 1, characterized in that: After the fixed conductive rod (12) is slidably inserted into the inner wall of the fixed seat (11), it is welded and fixed. The guide block (17) is arranged in a ring along the central point of the moving contact (16) and the fixed contact (13). The outer wall of the compression spring (19) on the side away from the positioning plate (18) is fixedly connected to the outer wall of the bottom of the connecting seat (14). The outer wall of the bottom of the moving contact (16) is in contact with the outer wall of the top of the fixed contact (13).

3. The guiding block and fixing structure of vacuum interrupter according to claim 1, characterized in that: An insulating shell (191) is bonded to the outer wall of the top of the fixed base (11). A shield (192) is provided inside the insulating shell (191). A guide sleeve (193) is slidably connected to the inner wall of the shield (192). A guide groove (194) is provided on the inner wall of the guide sleeve (193).

4. The guiding block and fixing structure of vacuum interrupter according to claim 3, characterized in that: The guide groove (194) is arranged in a ring around the central point of the guide sleeve (193). The outer wall of the top of the insulating shell (191) is bonded to the outer wall of the bottom of the connecting seat (14). The inner wall of the bottom of the shield (192) is slidably connected to the outer wall of the fixed conductive rod (12). The outer wall of the bottom of the shield (192) is in contact with and bonded to the outer wall of the top of the fixed seat (11). The outer wall of the bottom of the guide sleeve (193) is bonded to the inner wall of the bottom of the shield (192). The inner wall of the guide groove (194) is slidably connected to the outer wall of the guide block (17).

5. The guiding block and fixing structure of vacuum interrupter according to claim 1, characterized in that: The fixing structure (2) includes a fixing screw rod (21), the outer wall of which is slidably connected with a pressure plate (22) and a fixing plate (23), and the outer wall of the fixing screw rod (21) is threaded with a nut (24).

6. The guiding block and fixing structure of vacuum interrupter according to claim 5, characterized in that: The fixing screw rod (21) is symmetrically arranged on both sides of the pressure plate (22) and the fixing plate (23). The inner wall of the pressure plate (22) is slidably connected to the outer wall of the movable conductive rod (15). The outer wall of the bottom of the pressure plate (22) is in contact with the outer wall of the top of the connecting seat (14). The inner wall of the fixing plate (23) is slidably connected to the outer wall of the bottom of the fixing conductive rod (12). The outer wall of the top of the fixing plate (23) is in contact with the outer wall of the bottom of the fixing seat (11).

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