A safety isolation device for online maintenance of high-voltage electrical equipment

Abstract

This utility model discloses a safety isolation device for online maintenance of high-voltage electrical equipment, relating to the field of high-voltage disconnecting switch technology. The utility model includes a base, with a first insulator and a second insulator fixedly installed at both ends of the upper surface of the base. A movable blade is hinged to the top conductive plate of the first insulator, and a stationary contact is fixedly installed on the top conductive plate of the second insulator. A guide groove is fixedly installed on the upper surface of the base, and a slider is slidably installed within the guide groove. A threaded rod is rotatably installed within the guide groove, and an insulating rod is hinged to the top of the slider. In this utility model, the threaded rod drives the slider to slide within the guide groove, and the slider drives the bottom end of the insulating rod to move, causing the contact groove at one end of the movable blade to contact or disengage from the stationary contact, thereby achieving closing or opening. Because the threaded rod itself has a certain limiting function, it can keep the movable blade stable after closing or opening, thus ensuring that the disconnecting switch can reliably open and close.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage disconnect switch technology, specifically a safety isolation device for online maintenance of high-voltage electrical equipment. Background Technology

[0002] High-voltage disconnect switches are important switching devices in the electrical systems of power plants and substations. They must be used in conjunction with high-voltage circuit breakers. Disconnect switches are suitable for indoor installations of three-phase AC 50Hz with a rated voltage of 12KV. They are used to connect, disconnect, or switch lines when high-voltage equipment is under voltage and load. Their main functions are to ensure the safety of high-voltage electrical equipment during maintenance and to isolate voltage. They cannot be used to disconnect or connect load current or interrupt short-circuit current. They can only be used for certain switching operations that do not generate a strong electric arc, meaning they do not have an arc-extinguishing function. They are classified according to the installation location as indoor or outdoor, and according to the number of insulating supports as single-post, double-post, and triple-post. Optional equipment is available for each voltage level.

[0003] Some existing high-voltage disconnect switches typically rely solely on a simple lever structure to achieve closing and opening. This can easily lead to unstable contact between the moving blade and the stationary contact, and the moving blade can easily detach from the stationary contact unexpectedly. This cannot guarantee the reliable closing and opening of the disconnect switch, thus resulting in unreliable performance. To address these issues, the inventor proposes an online maintenance safety isolation device for high-voltage electrical equipment. Utility Model Content

[0004] To address the problem that some existing high-voltage disconnect switches typically rely solely on a simple lever structure for closing and opening, which can easily lead to unstable contact between the moving blade and the stationary contact, thus failing to guarantee the reliable closing and opening of the disconnect switch, the purpose of this utility model is to provide a safety isolation device for online maintenance of high-voltage electrical equipment.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a safety isolation device for online maintenance of high-voltage electrical equipment, comprising a base, a first insulator and a second insulator fixedly installed at both ends of the upper surface of the base, a conductive plate fixedly installed at the top of the first insulator and the second insulator, a movable blade hingedly installed on the top conductive plate of the first insulator, a stationary contact fixedly installed on the top conductive plate of the second insulator, a contact groove opened at one end of the movable blade, and the stationary contact can be locked in the contact groove of the movable blade, a guide groove fixedly installed on the upper surface of the base, a slider slidably installed in the guide groove, a threaded rod rotatably installed in the guide groove, and the threaded rod is threadedly inserted into the slider, an insulating rod hingedly installed at the top of the slider, and the top of the insulating rod is hingedly connected to one end of the lower surface of the movable blade.

[0006] Preferably, a drive shaft is rotatably mounted on one end of the guide groove, a worm is fixedly mounted on the drive shaft, a worm wheel is fixedly mounted on one end of the threaded rod and meshes with the worm, a handle is movably sleeved on one end of the drive shaft, a gear is fixedly mounted on one end of the drive shaft, a toothed groove matching the gear is opened in one end of the handle, and the handle can be sleeved on the gear through the toothed groove.

[0007] Preferably, a connecting plate is fixedly installed on one side of the top conductive plate of both the first insulator and the second insulator.

[0008] Preferably, a sliding groove is provided on both sides of the contact groove, and a conductive contact is slidably engaged in both sliding grooves. A spring is fixedly installed in both sliding grooves, and one end of the spring is fixedly connected to one end of the corresponding conductive contact. A groove is provided on both sides of the stationary contact, and the conductive contact can be engaged in the corresponding groove.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] 1. In this utility model, a threaded rod can be used to drive a slider to slide in a guide groove. The slider drives the bottom end of the insulating rod to move, so that the contact groove at one end of the moving blade contacts or separates from the stationary contact, thereby realizing the closing or opening of the switch. Since the threaded rod itself has a certain limiting function, it can keep the moving blade stable after closing or opening, thereby ensuring that the disconnecting switch can reliably open and close.

[0011] 2. In this utility model, when the high-voltage disconnect switch is used for a long time, the contact groove and stationary contact at one end of the moving blade will wear, which can easily lead to poor contact. When the switch is closed, the stationary contact is inserted into the contact groove at one end of the moving blade. The spring's rebound force makes the spherical end of the conductive contact lock in the corresponding groove on the stationary contact, thereby improving the stability of the connection between the moving blade and the stationary contact. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0015] Figure 3 This is a schematic diagram of the cross-sectional structure of the moving blade of this utility model;

[0016] Figure 4 This utility model Figure 3 Enlarged schematic diagram of the structure at point B;

[0017] Figure 5 This is a schematic diagram of the second insulator structure of this utility model;

[0018] Figure 6 This is a schematic diagram of the separation structure of the drive shaft and crank handle of this utility model.

[0019] In the diagram: 1. Base; 2. First insulator; 3. Second insulator; 4. Moving blade; 5. Connecting plate; 6. Insulating rod; 7. Guide groove; 8. Threaded rod; 9. Drive shaft; 10. Handle; 11. Slider; 12. Worm gear; 13. Worm; 14. Contact groove; 15. Slide groove; 16. Conductive contact; 17. Spring; 18. Stationary contact; 19. Groove; 20. Toothed rod; 21. Toothed groove. Detailed Implementation

[0020] 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.

[0021] Example: Figure 1-6 As shown, this utility model provides a safety isolation device for online maintenance of high-voltage electrical equipment, including a base 1. A first insulator 2 and a second insulator 3 are fixedly installed at both ends of the upper surface of the base 1. Conductive plates are fixedly installed at the top ends of both the first insulator 2 and the second insulator 3. A movable blade 4 is hinged to the top conductive plate of the first insulator 2, and a stationary contact 18 is fixedly installed on the top conductive plate of the second insulator 3. A contact groove 14 is formed at one end of the movable blade 4, and the stationary contact 18 can be engaged within the contact groove 14 of the movable blade 4. A guide groove 7 is fixedly installed on the upper surface of the base 1, and a slider 11 is slidably installed within the guide groove 7. A threaded rod 8 is rotatably installed in the guide groove 7, and the threaded rod 8 is threadedly inserted into the slider 11. An insulating rod 6 is hinged to the top of the slider 11, and the top of the insulating rod 6 is hinged to one end of the lower surface of the moving blade 4. The threaded rod 8 can drive the slider 11 to slide in the guide groove 7. The slider 11 drives the bottom end of the insulating rod 6 to move, and the insulating rod 6 drives the moving blade 4 to move, so that the contact groove 14 at one end of the moving blade 4 contacts or disengages from the stationary contact 18, thereby realizing the closing or opening of the switch. Since the threaded rod 8 itself has a certain limiting function, it can keep the moving blade 4 stable after closing or opening, thus ensuring that the disconnecting switch can reliably open and close.

[0022] A drive shaft 9 is rotatably mounted on one end of the guide groove 7. A worm gear 13 is fixedly mounted on the drive shaft 9. A worm wheel 12 is fixedly mounted on one end of the threaded rod 8, and the worm wheel 12 meshes with the worm gear 13. A crank handle 10 is movably sleeved on one end of the drive shaft 9. A gear rack 20 is fixedly mounted on one end of the drive shaft 9. A tooth groove 21 matching the gear rack 20 is opened in one end of the crank handle 10, and the crank handle 10 can be sleeved on the gear rack 20 through the tooth groove 21.

[0023] By adopting the above technical solution, when it is necessary to close or open the circuit, the crank 10 can be engaged with the toothed rod 20 at one end of the drive shaft 9 through the toothed groove 21. The crank 10 drives the drive shaft 9 to rotate, the drive shaft 9 drives the worm 13 to rotate, the worm 13 drives the worm wheel 12 to rotate, and the worm wheel 12 drives the threaded rod 8 to rotate.

[0024] A connecting plate 5 is fixedly installed on one side of the top conductive plate of both the first insulator 2 and the second insulator 3.

[0025] By adopting the above technical solution, the connecting plate 5 on one side of the top conductive plate of the first insulator 2 and the second insulator 3 is used to connect the connecting wires on the high-voltage electrical equipment.

[0026] The contact groove 14 has a sliding groove 15 on both sides, and a conductive contact 16 is slidably locked in both sliding grooves 15. A spring 17 is fixedly installed in both sliding grooves 15, and one end of the spring 17 is fixedly connected to one end of the corresponding conductive contact 16. The stationary contact 18 has a groove 19 on both sides, and the conductive contact 16 can be locked in the corresponding groove 19.

[0027] By adopting the above technical solution, when the high-voltage disconnecting switch is used for a long time, the contact groove 14 and the stationary contact 18 at one end of the moving blade 4 will wear, which can easily lead to poor contact. When the switch is closed, the stationary contact 18 is inserted into the contact groove 14 at one end of the moving blade 4. The spring force of the spring 17 is used to make the spherical end of the conductive contact 16 stuck in the corresponding groove 19 on the stationary contact 18 (the groove 19 is hemispherical, and the conductive contact 16 can be disengaged from the groove 19 with just a little force), thereby improving the stability of the connection between the moving blade 4 and the stationary contact 18.

[0028] Working principle: In use, the crank handle 10 can be fitted onto the toothed rod 20 at one end of the drive shaft 9 through the toothed groove 21. The crank handle 10 drives the drive shaft 9 to rotate, the drive shaft 9 drives the worm gear 13 to rotate, the worm gear 13 drives the worm wheel 12 to rotate, the worm wheel 12 drives the threaded rod 8 to rotate, the threaded rod 8 drives the slider 11 to slide in the guide groove 7, the slider 11 drives the bottom end of the insulating rod 6 to move, and the insulating rod 6 drives the moving blade 4 to move, so that the contact groove 14 at one end of the moving blade 4 contacts or disengages from the stationary contact 18, thereby realizing the closing or opening of the switch. Since the threaded rod 8 itself has a certain limiting function, it can keep the moving blade 4 stable after closing or opening, thereby ensuring that the disconnecting switch can reliably open and close.

[0029] When the high-voltage disconnector is used for a long time, the contact groove 14 and the stationary contact 18 at one end of the moving blade 4 will wear, which can easily lead to poor contact. When the switch is closed, the stationary contact 18 is inserted into the contact groove 14 at one end of the moving blade 4. The spring 17 is used to make the spherical end of the conductive contact 16 lock into the corresponding groove 19 on the stationary contact 18 (the groove 19 is hemispherical, and the conductive contact 16 can be disengaged from the groove 19 with just a little force), thereby improving the stability of the connection between the moving blade 4 and the stationary contact 18.

[0030] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A safety isolation device for online maintenance of high-voltage electrical equipment, comprising a base (1), characterized in that: The upper surface of the base (1) is fixedly installed with a first insulator (2) and a second insulator (3) at both ends. The top of the first insulator (2) and the second insulator (3) are both fixedly installed with conductive plates. A moving blade (4) is hingedly installed on the top conductive plate of the first insulator (2). A stationary contact (18) is fixedly installed on the top conductive plate of the second insulator (3). A contact groove (14) is opened at one end of the moving blade (4), and the stationary contact (18) can be locked in the contact groove (14) of the moving blade (4). A guide groove (7) is fixedly installed on the upper surface of the base (1). A slider (11) is slidably installed in the guide groove (7). A threaded rod (8) is rotatably installed in the guide groove (7), and the threaded rod (8) is threadedly inserted into the slider (11). An insulating rod (6) is hingedly installed at the top of the slider (11), and the top of the insulating rod (6) is hingedly connected to one end of the lower surface of the moving blade (4).

2. The online maintenance safety isolation device for high-voltage electrical equipment as described in claim 1, characterized in that, A drive shaft (9) is rotatably mounted on one end of the guide groove (7), and a worm gear (13) is fixedly mounted on the drive shaft (9).

3. The online maintenance safety isolation device for high-voltage electrical equipment as described in claim 1, characterized in that, One end of the threaded rod (8) is fixedly equipped with a worm gear (12), and the worm gear (12) meshes with the worm (13).

4. The online maintenance safety isolation device for high-voltage electrical equipment as described in claim 2, characterized in that, A crank handle (10) is movably sleeved on one end of the drive shaft (9), and a gear rack (20) is fixedly installed on one end of the drive shaft (9). A tooth groove (21) matching the gear rack (20) is opened in one end of the crank handle (10), and the crank handle (10) can be engaged and sleeved on the gear rack (20) through the tooth groove (21).

5. The online maintenance safety isolation device for high-voltage electrical equipment as described in claim 1, characterized in that, A connecting plate (5) is fixedly installed on one side of the top conductive plate of the first insulator (2) and the second insulator (3).

6. The online maintenance safety isolation device for high-voltage electrical equipment as described in claim 1, characterized in that, The contact groove (14) has sliding grooves (15) on both sides, and conductive contacts (16) are slidably engaged in the two sliding grooves (15).

7. The online maintenance safety isolation device for high-voltage electrical equipment as described in claim 6, characterized in that, Springs (17) are fixedly installed in both of the slides (15), and one end of the spring (17) is fixedly connected to one end of the corresponding conductive contact (16).

8. The online maintenance safety isolation device for high-voltage electrical equipment as described in claim 1, characterized in that, The stationary contact (18) has grooves (19) on both sides, and the conductive contact (16) can be locked in the corresponding groove (19).

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