Multi-position disconnector for switchgear

Abstract

This utility model relates to the field of disconnecting switch technology, and in particular to a multi-position disconnecting switch for switchgear. It includes a sealed housing, with a top cover insulator fixed to the top of the housing. A storage cavity is formed by an inward indentation in the middle of the housing, and a main double-pole basin insulator and a secondary double-pole basin insulator are fixed to both ends of the housing, respectively. Two single-pole mechanisms are arranged inside the storage cavity. This utility model utilizes the cooperation of structures such as a high-voltage stationary contact, an isolating stationary contact, a grounding stationary contact, a moving contact, a magnetohydrodynamic rotating sealing rod, and an insulating pull rod. The magnetohydrodynamic rotating sealing rod and the insulating pull rod work together to precisely drive the moving contact to perform reciprocating linear motion, forming a stable and reliable conductive connection with the high-voltage stationary contact, the isolating stationary contact, and the grounding stationary contact. This efficiently achieves flexible switching between the three working states of connection, isolation, and grounding, enhancing the stability of the conductive connection and ensuring the reliability and accuracy of the disconnecting switch's working position switching.

Description

Technical Field

[0001] This utility model relates to the field of disconnecting switch technology, and in particular to a multi-position disconnecting switch for switching equipment. Background Technology

[0002] Currently, vacuum dielectrics are widely used in railway circuit breakers due to their unique advantages. Vacuum dielectrics possess extremely high insulation strength, enabling rapid arc extinguishing at the instant the current crosses zero, significantly improving safety during circuit breaking. Simultaneously, the extremely low oxidation level of contacts in a vacuum environment allows the circuit breaker's mechanical life to reach tens of thousands of cycles, meeting the stringent requirements of frequent load and fault current interruptions in railway systems. Furthermore, the vacuum arc extinguishing process emits no greenhouse gases, aligning with current green and environmentally friendly principles. Vacuum arc extinguishing technology has become the mainstream choice for railway electrical equipment.

[0003] Although most high-voltage AC metal-enclosed switchgear for railways uses vacuum arc extinguishing, and air insulation is more common in China, different insulation methods place different requirements on the disconnecting switches matched with vacuum circuit breakers. The disconnecting switch needs to frequently switch between three working positions: connected, isolated, and grounded. In actual operation, the moving contact needs to frequently contact different stationary contacts to complete the position switching. However, the internal space of the disconnecting switch is compact, and it is subjected to high voltage, causing the moving contact to be in a high-intensity electric field environment for a long time. Under this condition, the moving contact is very easy to be damaged by the electric field, which not only reduces the working reliability of the disconnecting switch and shortens the service life of the equipment, but also causes poor contact and incomplete switching, seriously threatening the safe and stable operation of the railway power system. Therefore, we propose a multi-position disconnecting switch for switchgear. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a multi-position disconnect switch for switchgear.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A multi-position disconnecting switch for switchgear includes a sealed housing. A top cover insulator is fixed to the top of the sealed housing. A storage cavity is formed by an inward indentation in the middle of the sealed housing. A main double-pole basin-type insulator and a secondary double-pole basin-type insulator are fixed to both ends of the sealed housing, respectively. Two single-pole mechanisms are arranged inside the storage cavity. Each single-pole mechanism includes an insulating support rod fixed inside the sealed housing. An isolating stationary contact is fixed to the top of the insulating support rod. A moving contact is movably connected inside the isolating stationary contact. A magnetohydrodynamic rotating sealing rod is arranged in the middle of the main double-pole basin-type insulator. The double-pole basin insulator has a high-voltage stationary contact in the middle that matches the moving contact. The magnetohydrodynamic rotating sealing rod has a grounding stationary contact that matches the moving contact on the side away from the main double-pole basin insulator. The high-voltage stationary contact and the grounding stationary contact are both provided with grooves that match the moving contact on the opposite side. When the moving contact is located inside the isolating stationary contact, the switch is in the isolated state. When the moving contact moves between the isolating stationary contact and the grounding stationary contact, the switch is in the grounded state. When the moving contact moves between the high-voltage stationary contact and the isolating stationary contact, the switch is in the closed state.

[0007] As a preferred embodiment of this utility model, an insulating pull rod is fixed to one end of the magnetic fluid rotating sealing rod away from the main bipolar basin insulator. The insulating pull rod passes through the grounding stationary contact and is inserted into the interior of the isolating stationary contact. The outer wall of the insulating pull rod is provided with a threaded portion. A threaded hole adapted to the threaded portion is provided on the side of the moving contact near the grounding stationary contact. A driving device is movably connected to one end of the magnetic fluid rotating sealing rod away from the grounding stationary contact after passing through the main bipolar basin insulator. The end of the magnetic fluid rotating sealing rod passing through the main bipolar basin insulator is fixed to the air chamber wall or flange. A gear is also fixed to one end of the magnetic fluid rotating sealing rod passing through the main bipolar basin insulator. The gear is connected to its external driving device. The driving device drives the gear to rotate, which in turn drives the magnetic fluid rotating sealing rod to rotate. The magnetic fluid rotating sealing rod drives the insulating pull rod to rotate, which in turn drives the threaded portion to rotate. The threaded portion engages with the threaded hole, causing the moving contact to move laterally back and forth along the outer wall of the insulating pull rod.

[0008] As a preferred embodiment of this utility model, both the high-voltage stationary contact and the grounding stationary contact are provided with R-shaped main protrusions on their opposing sides, and both ends of the isolating stationary contact are provided with R-shaped secondary protrusions. The R-shape of the main protrusions and secondary protrusions can balance the electric field, avoid the breakdown of the equipment due to excessive local field strength, and ensure reliable insulation performance with a small external size.

[0009] As a preferred embodiment of this utility model, a main spring contact finger is provided on the opposite side of the high-voltage stationary contact and the grounding stationary contact, and the main spring contact finger is located in the groove. Several auxiliary spring contact fingers are also provided inside the isolating stationary contact, and the several auxiliary spring contact fingers are evenly arranged inside the auxiliary protrusion. The inner diameter of both the main spring contact finger and the auxiliary spring contact finger is larger than the outer diameter of the moving contact.

[0010] As a preferred embodiment of this utility model, a supporting insulator is fixed to the end of the high-voltage stationary contact away from the isolating stationary contact. A connecting bar is fixed to the outer wall of the supporting insulator. An extension sleeve is fixed to the connecting bar away from the supporting insulator. A grounding bar is also fixed to the outside of the magnetohydrodynamic rotating sealing rod. The end of the extension sleeve away from the connecting bar passes through the secondary bipolar basin insulator and extends to the outside of the secondary bipolar basin insulator. The extension sleeve is fixed to the secondary bipolar basin insulator.

[0011] Compared with the prior art, the beneficial effects that this utility model can achieve are:

[0012] This utility model utilizes the combination of a high-voltage stationary contact, an isolating stationary contact, a grounding stationary contact, a moving contact, a magnetic fluid rotating sealing rod, and an insulating pull rod. The magnetic fluid rotating sealing rod and the insulating pull rod work together to precisely drive the moving contact to perform reciprocating linear motion. This enables a stable and reliable conductive connection with the high-voltage stationary contact, the isolating stationary contact, and the grounding stationary contact, thereby efficiently achieving flexible switching between the three working states of connection, isolation, and grounding. This enhances the stability of the conductive connection, reduces problems such as poor contact and incomplete switching, and ensures the reliability and accuracy of the working position switching of the disconnecting switch.

[0013] This invention, through the R-shaped arrangement of the main and secondary protrusions, can balance the electric field, avoid breakdown of the equipment due to excessive local field strength, and ensure reliable insulation performance with a small external size. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the magnetohydrodynamic rotating sealing rod of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the present invention in the grounding state;

[0017] Figure 4 This is a schematic diagram of the structure of the present invention in its isolated state;

[0018] Figure 5 This is a schematic diagram of the structure of the present invention in the closed state.

[0019] The components are: 1. High-voltage stationary contact; 2. Isolating stationary contact; 3. Grounding stationary contact; 4. Magnetohydrodynamic rotating sealing rod; 5. Grounding busbar; 6. Main bipolar basin insulator; 7. Moving contact; 8. Connecting busbar; 9. Supporting insulator; 10. Extension sleeve; 11. Main spring contact finger; 12. Insulating tie rod; 13. Sealed shell; 14. Secondary bipolar basin insulator; 15. Top cover insulator; 16. Insulating support rod; 17. Secondary spring contact finger. Detailed Implementation

[0020] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this utility model. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0021] Example: This utility model provides, for example... Figure 1 The multi-position disconnect switch for switchgear shown includes a sealed housing 13, a top cover insulator 15 fixed to the top of the sealed housing 13, a storage cavity formed by the inward indentation in the middle of the sealed housing 13, and a main double-pole basin insulator 6 and a secondary double-pole basin insulator 14 fixed to the two ends of the sealed housing 13, respectively.

[0022] As can be seen from the above, when in use, after the sealed shell 13 is installed in the designated position, the main double-pole basin insulator 6 and the auxiliary double-pole basin insulator 14 are connected to the high-voltage equipment respectively.

[0023] refer to Figures 1-5 As shown, the storage cavity is equipped with two single-pole mechanisms. Each single-pole mechanism includes an insulating support rod 16 fixed inside the sealed shell 13. An isolating stationary contact 2 is fixed to the top of the insulating support rod 16. A moving contact 7 is movably connected inside the isolating stationary contact 2. A magnetohydrodynamic rotating sealing rod 4 is provided in the middle of the main double-pole basin insulator 6. A high-voltage stationary contact 1 that cooperates with the moving contact 7 is provided in the middle of the auxiliary double-pole basin insulator 14. A grounding stationary contact 3 that cooperates with the moving contact 7 is provided on the side of the magnetohydrodynamic rotating sealing rod 4 away from the main double-pole basin insulator 6. A groove adapted to the moving contact 7 is opened on the opposite side of the high-voltage stationary contact 1 and the grounding stationary contact 3. When the moving contact 7 is located inside the isolating stationary contact 2, the switch is in the isolated state. When the moving contact 7 moves between the isolating stationary contact 2 and the grounding stationary contact 3, the switch is in the grounded state. When the moving contact 7 moves between the high-voltage stationary contact 1 and the isolating stationary contact 2, the switch is in the closed state.

[0024] refer to Figures 1-5 As shown, an insulating pull rod 12 is fixed to one end of the magnetic fluid rotating sealing rod 4 away from the main bipolar basin insulator 6. The insulating pull rod 12 passes through the grounding stationary contact 3 and is inserted into the interior of the isolating stationary contact 2. The outer wall of the insulating pull rod 12 is provided with a threaded part. The moving contact 7 is provided with a threaded hole that matches the threaded part on the side near the grounding stationary contact 3. The end of the magnetic fluid rotating sealing rod 4 away from the grounding stationary contact 3 passes through the main bipolar basin insulator 6 and is movably connected to a driving device. The end of the magnetic fluid rotating sealing rod 4 that passes through the main bipolar basin insulator 6 is fixed to the air chamber wall or flange. A gear is also fixed to the end of the magnetic fluid rotating sealing rod 4 that passes through the main bipolar basin insulator 6. The gear is connected to its external driving device. The driving device drives the gear to rotate, which drives the magnetic fluid rotating sealing rod 4 to rotate. The magnetic fluid rotating sealing rod 4 drives the insulating pull rod 12 to rotate. The insulating pull rod 12 drives the threaded part to rotate. Through the engagement of the threaded part and the threaded hole, the moving contact 7 moves laterally back and forth along the outer wall of the insulating pull rod 12.

[0025] refer to Figures 1-5 As shown, a supporting insulator 9 is fixed to the end of the high-voltage stationary contact 1 away from the isolating stationary contact 2. A connecting bar 8 is fixed to the outer wall of the supporting insulator 9. An extension sleeve 10 is fixed to the connecting bar 8 away from the supporting insulator 9. A grounding bar 5 is also fixed to the outside of the magnetohydrodynamic rotating sealing rod 4. The end of the extension sleeve 10 away from the connecting bar 8 passes through the secondary bipolar basin insulator 14 and extends to the outside of the secondary bipolar basin insulator 14. The extension sleeve 10 is fixed to the secondary bipolar basin insulator 14.

[0026] When it is necessary to control the moving contact 7, one end of the magnetic fluid rotating sealing rod 4 is connected to the drive device. The drive device drives the magnetic fluid rotating sealing rod 4 to rotate through the gear. The magnetic fluid rotating sealing rod 4 drives the insulating pull rod 12 to rotate. The insulating pull rod 12 drives the threaded part to rotate. Through the engagement of the threaded part and the threaded hole, the moving contact 7 moves laterally back and forth along the outer wall of the insulating pull rod 12. When the moving contact 7 moves completely into the interior of the isolating stationary contact 2, the switch is in the isolation state. When the moving contact 7 moves between the isolating stationary contact 2 and the grounding stationary contact 3, the switch is in the grounding state. When the moving contact 7 moves between the high voltage stationary contact 1 and the isolating stationary contact 2, the switch is in the closed state. The sealed enclosure 13 isolates the magnetic fluid rotating sealing rod 4 and the expansion sleeve 10 from the outside environment.

[0027] refer to Figures 1-5 As shown, both the high-voltage stationary contact 1 and the grounding stationary contact 3 have R-shaped main protrusions on their opposite sides, and both ends of the isolating stationary contact 2 have R-shaped secondary protrusions. The R-shape of the main and secondary protrusions can balance the electric field, avoid the breakdown of the equipment due to excessive local field strength, and ensure reliable insulation performance with a small external size.

[0028] refer to Figures 1-5 As shown, a main spring contact finger 11 is provided on the opposite side of the high-voltage stationary contact 1 and the grounding stationary contact 3, and the main spring contact finger 11 is located in the groove. Several auxiliary spring contact fingers 17 are also provided inside the isolating stationary contact 2, and the several auxiliary spring contact fingers 17 are evenly arranged inside the auxiliary protrusion. The inner diameter of the main spring contact finger 11 and the auxiliary spring contact fingers 17 are both larger than the outer diameter of the moving contact 7.

[0029] The R-shaped design, achieved through the main and secondary bumps, balances the electric field, preventing equipment breakdown due to excessive local field concentration and ensuring reliable insulation performance within a relatively small footprint.

[0030] Working principle:

[0031] refer to Figures 1-5 As shown, when it is necessary to control the moving contact 7, after connecting one end of the magnetic fluid rotating sealing rod 4 to the driving device, the driving device drives the magnetic fluid rotating sealing rod 4 to rotate through the gear. The magnetic fluid rotating sealing rod 4 drives the insulating pull rod 12 to rotate, and the insulating pull rod 12 drives the threaded part to rotate. Through the engagement of the threaded part with the threaded hole, the moving contact 7 moves laterally back and forth along the outer wall of the insulating pull rod 12. When the moving contact 7 moves completely into the interior of the isolating stationary contact 2, the switch is in the isolated state. When the moving contact 7 moves between the isolating stationary contact 2 and the grounding stationary contact 3, the moving contact 7 and the grounding stationary contact 3... When the main spring contact finger 11 and the auxiliary spring contact finger 17 are in contact, the switch is in the grounded state. When the moving contact 7 moves between the high-voltage stationary contact 1 and the isolating stationary contact 2, the moving contact 7 contacts the main spring contact finger 11 and the auxiliary spring contact finger 17 in the high-voltage stationary contact 1, and the switch is in the closed state. The magnetic fluid rotating sealing rod 4 and the extended sleeve 10 are isolated from the external environment through the sealed enclosure 13. The reciprocating moving contact 7 forms a reliable conductive connection with the high-voltage stationary contact 1, the isolating stationary contact 2 and the grounding stationary contact 3, thereby completing the conversion between the three working positions of connection, isolation and grounding.

[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A multi-position disconnecting switch for switchgear, comprising a sealed housing (13), wherein a top cover insulator (15) is fixed to the top of the sealed housing (13), the middle of the sealed housing (13) is recessed inward to form a storage cavity, and a main double-pole basin insulator (6) and a secondary double-pole basin insulator (14) are respectively fixed to both ends of the sealed housing (13), characterized in that, The storage cavity is provided with two single-pole mechanisms. The single-pole mechanism includes an insulating support rod (16) fixed inside the sealed shell (13). An isolating stationary contact (2) is fixed on the top of the insulating support rod (16). A moving contact (7) is movably connected inside the isolating stationary contact (2). A magnetic fluid rotating sealing rod (4) is provided in the middle of the main double-pole basin insulator (6). A high-voltage stationary contact (1) that cooperates with the moving contact (7) is provided in the middle of the auxiliary double-pole basin insulator (14). A grounding stationary contact (3) that cooperates with the moving contact (7) is provided on the side of the magnetic fluid rotating sealing rod (4) away from the main double-pole basin insulator (6). A groove adapted to the moving contact (7) is opened on the side of the high-voltage stationary contact (1) and the grounding stationary contact (3) facing each other.

2. A multi-position disconnect switch for switchgear according to claim 1, characterized in that, An insulating rod (12) is fixed at one end of the magnetic fluid rotating sealing rod (4) away from the main bipolar basin insulator (6). The insulating rod (12) passes through the grounding stationary contact (3) and is inserted into the interior of the isolation stationary contact (2). The outer wall of the insulating rod (12) is provided with a threaded part. The moving contact (7) is provided with a threaded hole that matches the threaded part on the side near the grounding stationary contact (3).

3. A multi-position disconnect switch for switchgear according to claim 1, characterized in that, The high-voltage stationary contact (1) and the grounding stationary contact (3) are each provided with an R-shaped main protrusion on the opposite side, and the isolation stationary contact (2) is provided with R-shaped secondary protrusions at both ends.

4. A multi-position disconnect switch for switchgear according to claim 1, characterized in that, The high-voltage stationary contact (1) and the grounding stationary contact (3) are provided with a main spring contact finger (11) on the opposite side, and the isolation stationary contact (2) is also provided with a number of auxiliary spring contact fingers (17).

5. A multi-position disconnect switch for switchgear according to claim 1, characterized in that, The high-voltage stationary contact (1) is fixed with a support insulator (9) at one end away from the isolation stationary contact (2). A connecting bar (8) is fixed on the outer wall of the support insulator (9). An extension sleeve (10) is fixed on the connecting bar (8) away from the support insulator (9). A grounding bar (5) is also fixed on the outside of the magnetohydrodynamic rotating sealing rod (4).

Images