Movable conducting rod for vacuum arc-extinguishing chamber

Abstract

The utility model relates to a movable conducting rod for a vacuum arc-extinguishing chamber, which relates to the technical field of vacuum arc-extinguishing chambers and comprises an airtight insulation system, a conducting system, a shielding cylinder and a limiting assembly. The airtight insulation system comprises a porcelain shell, a movable end cover plate, a static end cover plate and a guide sleeve, the movable end cover plate and the static end cover plate cover the two ends of the porcelain shell respectively, and the guide sleeve is arranged on the movable end cover plate; the conductive system comprises a movable conductive rod and a static conductive rod, and the movable conductive rod and the static conductive rod are vertically mounted on the movable end cover plate and the static end cover plate respectively; the limiting assembly comprises a limiting ring and a threaded sleeve, the limiting ring is connected with the threaded sleeve, the guide sleeve is connected to the movable conducting rod in a sleeving mode, a limiting groove is formed in the guide sleeve, the threaded sleeve is rotationally arranged in the limiting groove through threads, a first guide face is arranged in the limiting groove, and a second guide face matched with the first guide face is arranged on the limiting ring. According to the utility model, through the limiting assembly, the limiting effect of the limiting mechanism on the movable conducting rod is improved, and the service life of the limiting mechanism is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum interrupters, in particular to a moving conductive rod for a vacuum interrupter. Background Technique

[0002] A vacuum interrupter, also known as a vacuum switch tube, is a core component of medium and high voltage power switches. Its main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit cuts off the power supply through the excellent insulation of the vacuum inside the tube, avoiding accidents and unexpected situations. It is mainly applied to the power transmission and distribution control system, and also applied to the distribution systems such as metallurgy, mining, petroleum, chemical industry, railway, broadcasting, communication, and industrial high-frequency heating. It has the characteristics of energy saving, material saving, fire prevention, explosion prevention, small volume, long life, low maintenance cost, reliable operation, and no pollution. Vacuum interrupters are divided into interrupters for circuit breakers and interrupters for load switches according to their uses. Circuit breaker interrupters are mainly used in substations and grid facilities in the power sector, and load switch interrupters are mainly used for end-users of the grid; when a vacuum load switch and a vacuum contactor are closed, the operating mechanism makes the two contacts close through the movement of the moving conductive rod, completing the connection of the circuit.

[0003] At present, the Chinese utility model patent application with the publication date of May 27, 2022 and the publication number of CN216624092U proposed a limiting structure for a moving conductive rod of a vacuum interrupter, including an interrupter and a limiting mechanism. The interrupter includes a porcelain shell, a static cover plate, a moving cover plate, a moving conductive rod, a static conductive rod, a guide sleeve, a bellows, a bellows shielding cover, a shielding cylinder, and a contact. The static cover plate and the moving cover plate are fixedly installed at both ends of the porcelain shell. The guide sleeve is installed at the end of the moving cover plate. The moving conductive rod passes through the guide sleeve into the interior of the moving cover plate. The bellows is located inside the moving cover plate and sleeved on the moving conductive rod; the interior of the guide sleeve is a cavity structure, and the limiting mechanism is arranged inside the guide sleeve; the end of the bellows is sleeved and clamped on the limiting mechanism inside the guide sleeve; the utility model can limit the moving conductive rod and the bellows through the limiting mechanism, avoid damaging the bellows when the moving conductive rod bears a large pushing and pulling force, and improve the service life of the interrupter.

[0004] However, in actual use, the above-mentioned limiting mechanism limits the moving conductive rod through a spring and a limiting plate. The spring is elastic, and its limiting effect is not good; moreover, when the moving conductive rod moves, it is easy to drive the limiting plate to move and drive the spring to shake, which is not conducive to the long-term use of the limiting mechanism. Content of the Utility Model

[0005] The utility model provides a moving conductive rod for a vacuum interrupter, which can improve the technical problems existing in the related art that the existing limiting mechanism has a poor limiting effect on the moving conductive rod and is not durable.

[0006] An embodiment of the present application provides a moving conductive rod for a vacuum interrupter, including:

[0007] An airtight insulation system, a conductive system, a shielding cylinder and a limiting component; the airtight insulation system includes a porcelain shell, a moving end cover plate, a static end cover plate and a guide sleeve. The moving end cover plate and the static end cover plate are respectively covered at both ends of the porcelain shell, and the guide sleeve is arranged on the moving end cover plate; the conductive system includes a moving conductive rod and a static conductive rod. The moving conductive rod and the static conductive rod are respectively vertically installed on the moving end cover plate and the static end cover plate and both extend into the porcelain shell; the limiting component includes a limiting ring and a threaded sleeve. The limiting ring is connected to the threaded sleeve. The guide sleeve is sleeved on the moving conductive rod. A limiting groove is formed on the guide sleeve. The threaded sleeve is rotationally arranged in the limiting groove through threads. A first guiding surface is inclined on one side of the limiting groove close to the moving conductive rod. A second guiding surface matching the first guiding surface is arranged on the limiting ring, and the first guiding surface abuts against the second guiding surface.

[0008] In the above technical solution of the embodiment of the present application, there are at least the following technical effects: when fixing the moving conductive rod, rotate the threaded sleeve, the limiting ring rotates, and the second guiding surface moves towards the direction close to the first guiding surface. The elastically arranged guide sleeve moves towards the direction close to the moving conductive rod under the abutting force of the second guiding surface and forms a limit on it; therefore, the setting of the limiting groove, the limiting ring and the threaded sleeve enables the staff to form a limit on the moving conductive rod by rotating the threaded sleeve, making it difficult to shake during the working process. And when the moving conductive rod is worn after long-term use, the threaded sleeve can be rotated continuously, so that the guide sleeve moves towards the direction close to the moving conductive rod under the abutting force of the second guiding surface and forms a limit on it, increasing the durability of the limiting component.

[0009] A moving conductive rod for a vacuum interrupter provided by an embodiment of the present application can form a limit on the moving conductive rod by rotating the threaded sleeve, and the limiting effect is good. When the moving conductive rod is worn after long-term use, the threaded sleeve can be rotated continuously, so that the guide sleeve moves towards the direction close to the moving conductive rod under the abutting force of the second guiding surface and forms a limit on it, increasing the service life of the limiting component.

[0010] In some embodiments, a plurality of sliding grooves extending along the moving direction of the moving conductive rod are formed on the moving conductive rod, and a plurality of sliding strips matching the sliding grooves are arranged on the guide sleeve.

[0011] In some embodiments, the two side walls of the sliding groove formed on the moving conductive rod are respectively a first groove wall and a second groove wall. The first groove wall and the second groove wall extend radially outward along the moving conductive rod and are gradually inclined towards the opposite direction between the two to form an inclined surface.

[0012] In some embodiments, a gap is provided between the side of the limit ring away from the threaded sleeve and the inner wall of the limit groove, and a knob is connected to the side of the threaded sleeve away from the guide sleeve through a connecting sleeve.

[0013] In some embodiments, the airtight insulation system includes a bellows and a bellows shielding cover. The bellows shielding cover is fixedly sleeved on the moving conductive rod, and the bellows is disposed around the side of the moving conductive rod and fixed to the moving end cover plate and the bellows shielding cover at both ends respectively.

[0014] In some embodiments, the conductive system further includes a moving contact and a static contact. The moving contact and the static contact are respectively disposed at the ends of the moving conductive rod and the static conductive rod, and the moving contact and the static contact can be in contact with each other under the movement of the moving conductive rod to achieve electrical connection.

[0015] In some embodiments, the shielding cylinder is fixed in the porcelain shell and covers the moving contact and the static contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 FIG. 1 is a three-dimensional structural diagram of a moving conductive rod for a vacuum interrupter provided by an embodiment of the present application;

[0018] Figure 2 FIG. 2 is Figure 1 a sectional view taken along line A-A in FIG. 1;

[0019] Figure 3 FIG. 3 is Figure 2 an enlarged view of part B in FIG. 2;

[0020] Figure 4 FIG. 4 is a three-dimensional structural diagram of a guide sleeve, a moving conductive rod and a moving contact provided by an embodiment of the present application;

[0021] Figure 5 FIG. 5 is Figure 4 an enlarged view of part C in FIG. 4.

[0022] Among them, the reference numerals in the figures:

[0023] 10. Hermetic insulation system; 11. Ceramic shell; 12. Moving end cover plate; 13. Static end cover plate; 14. Guide sleeve; 141. Limit groove; 142. First guiding surface; 143. Slide bar; 15. Bellows; 16. Bellows shielding cover; 20. Conductive system; 21. Moving conductive rod; 211. Slide groove; 212. First groove wall; 213. Second groove wall; 22. Static conductive rod; 23. Moving contact; 24. Static contact; 30. Limiting component; 31. Limiting ring; 311. Second guiding surface; 32. Threaded sleeve; 33. Connecting sleeve; 34. Connecting sleeve; 40. Shielding cylinder. Detailed implementation manner

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following further details this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and do not limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0027] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of this application.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0029] In this application, "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0030] It should be noted that, in the present application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to indicate examples, illustrations or descriptions. Any embodiment or design described in the present application as "in some embodiments", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in some embodiments", "exemplarily", "for example", etc. is intended to present related concepts in a concrete way, meaning that specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the above words in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] The vacuum interrupter, also known as the vacuum switch tube, is the core component of the medium and high voltage power switch. Its main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit is cut off from the power supply through the excellent insulation of the vacuum in the tube, so as to avoid accidents and unexpected events. It is mainly used in the power transmission and distribution control system, and also used in metallurgy, mining, petroleum, chemical industry, railway, broadcasting, communication, industrial high-frequency heating and other power distribution systems. It has the characteristics of energy saving, material saving, fire prevention, explosion prevention, small size, long life, low maintenance cost, reliable operation and no pollution. The vacuum interrupter is divided into the interrupter for circuit breakers and the interrupter for load switches in terms of use. The interrupter for circuit breakers is mainly used in substations and power grid facilities in the power sector, and the interrupter for load switches is mainly used for end users of the power grid; when the vacuum load switch and the vacuum contactor are closed, the operating mechanism closes the two contacts through the movement of the moving conductive rod, completing the circuit connection.

[0032] The existing limiting mechanism limits the movable conductive rod by a spring and a limiting plate. The spring is elastic and has a poor limiting effect. Moreover, when the movable conductive rod moves, it is easy to drive the limiting plate to move and drive the spring to shake, which is not conducive to the long-term use of the limiting mechanism.

[0033] Based on this, the technical problems in the related art that the existing limiting mechanism has a poor limiting effect on the moving conductive rod and is not durable can be improved, and the embodiments of the present application provide the following solutions.

[0034] An embodiment of the present application provides a moving conductive rod for a vacuum interrupter, including:

[0035] An airtight insulation system 10, a conductive system 20, a shielding cylinder 40 and a limiting component 30; the airtight insulation system 10 includes a porcelain shell 11, a moving end cover plate 12, a static end cover plate 13 and a guide sleeve 14. The moving end cover plate 12 and the static end cover plate 13 are respectively covered at both ends of the porcelain shell 11, and the guide sleeve 14 is arranged on the moving end cover plate 12; the conductive system 20 includes a moving conductive rod 21 and a static conductive rod 22. The moving conductive rod 21 and the static conductive rod 22 are respectively vertically installed on the moving end cover plate 12 and the static end cover plate 13 and both extend into the porcelain shell 11; the limiting component 30 includes a limiting ring 31 and a threaded sleeve 32. The limiting ring 31 is connected to the threaded sleeve 32. The guide sleeve 14 is sleeved on the moving conductive rod 21. A limiting groove 141 is formed on the guide sleeve 14. The threaded sleeve 32 is rotationally arranged in the limiting groove 141 through threads. A first guiding surface 142 is inclinedly arranged on one side of the limiting groove 141 close to the moving conductive rod 21. A second guiding surface 311 cooperating with the first guiding surface 142 is arranged on the limiting ring 31. The first guiding surface 142 abuts against the second guiding surface 311.

[0036] As can be seen from the above, for the moving conductive rod 21 for a vacuum interrupter provided by the embodiment of the present application, when fixing the moving conductive rod 21, rotate the threaded sleeve 32, the limiting ring 31 rotates, and the second guiding surface 311 moves towards the direction close to the first guiding surface 142. The elastically arranged guide sleeve 14 moves towards the direction close to the moving conductive rod 21 under the abutting force of the second guiding surface 311 and forms a limit on it; therefore, the arrangement of the limiting groove 141, the limiting ring 31 and the threaded sleeve 32 enables the staff to form a limit on the moving conductive rod 21 by rotating the threaded sleeve 32, making it difficult to shake during the working process. And when the moving conductive rod 21 is worn after long-term use and causes wear to the guide sleeve 14, the threaded sleeve 32 can be rotated continuously, so that the guide sleeve 14 moves towards the direction close to the moving conductive rod 21 under the abutting force of the second guiding surface 311 and forms a limit on it, increasing the durability of the limiting component 30.

[0037] Optionally, in some embodiments, please refer to Figures 1 to 2 , the airtight insulation system 10 includes a bellows 15 and a bellows shielding cover 16. The bellows shielding cover 16 is fixedly sleeved on the moving conductive rod 21. The bellows 15 is arranged around the side of the moving conductive rod 21 and both ends are respectively fixed on the moving end cover plate 12 and the bellows shielding cover 16.

[0038] With such a setting, the bellows 15 mainly functions to ensure the movement of the moving electrode within a certain range and maintain a high vacuum for a long time, and to ensure that the vacuum interrupter has a high mechanical life. The bellows 15 of the vacuum interrupter is a thin-walled component made of stainless steel with a thickness of 0.1 to 0.2 mm. The bellows shield 16 mainly protects the bellows 15 from corrosion by metal vapor and resulting air leakage, and is used to protect the bellows 15.

[0039] Optionally, in some embodiments, refer to Figures 1 to 2 , the conductive system 20 further includes a moving contact 23 and a static contact 24. The moving contact 23 and the static contact 24 are respectively disposed at the ends of the moving conductive rod 21 and the static conductive rod 22. The moving contact 23 and the static contact 24 can be brought into contact with each other under the movement of the moving conductive rod 21 to achieve electrical connection.

[0040] With such a setting, when the circuit is turned on, the movement of the moving conductive rod 21 causes the moving contact 23 and the static contact 24 to close, completing the connection of the circuit. When the vacuum switch interrupts the current, the two contacts of the interrupter separate and an arc is generated therebetween until the arc extinguishes when the current naturally passes through zero, thus completing the opening of the circuit. Therefore, the setting of the moving contact 23 and the static contact 24 facilitates the vacuum interrupter to achieve the connection and disconnection of the circuit.

[0041] Optionally, in some embodiments, refer to Figures 1 to 2 , the shielding cylinder 40 is fixed within the porcelain shell 11 and covers the moving contact 23 and the static contact 24.

[0042] With such a setting, when the vacuum interrupter interrupts a short-circuit current, an arc is generated between the moving contact 23 and the static contact 24. Most of the heat energy generated by the arc is absorbed by the shielding cylinder 40, which is beneficial to improving the dielectric recovery strength between the contacts. The larger the amount of arc products absorbed by the shielding cylinder 40, the greater the energy it absorbs, which plays a good role in increasing the breaking capacity of the vacuum interrupter.

[0043] Optionally, in some embodiments, refer to Figures 2 to 3 , a gap is provided between one side of the limit ring 31 away from the threaded sleeve 32 and the inner wall of the limit groove 141. One side of the threaded sleeve 32 away from the guide sleeve 14 is connected with a knob 34 through a connecting sleeve 33.

[0044] With such a setting, when limiting the moving conductive rod 21, the gap provided between one side of the limit ring 31 away from the threaded sleeve 32 and the inner wall of the limit groove 141 enables the limit ring 31 to move towards the direction close to the first guiding surface 142. By rotating the knob 34, the threaded sleeve 32 rotates, and the elastically arranged guide sleeve 14 moves towards the direction close to the moving conductive rod 21 under the resistance of the second guiding surface 311 and forms a limit on it. Therefore, the setting of the knob 34 facilitates the staff to control the limiting degree of the limiting component 30.

[0045] Optionally, in some embodiments, refer to Figure 4 , a plurality of sliding grooves 211 extending along the moving direction of the moving conductive rod 21 are formed on the moving conductive rod 21, and a plurality of sliding strips 143 matching the sliding grooves 211 are arranged on the guide sleeve 14.

[0046] With such a setting, the sliding grooves 211 are formed on the moving conductive part of the moving conductive rod 21 and are matched with the sliding strips 143 on the guide sleeve 14, so that it is difficult for the moving conductive rod 21 to twist left and right when moving up and down in the guide sleeve 14, thereby reducing the probability of the moving conductive rod 21 rotating during assembly and operation, so that it is difficult for the moving conductive rod 21 to sprain the bellows 15 of the vacuum interrupter, resulting in air leakage and scrapping of the vacuum interrupter.

[0047] Optionally, in some embodiments, refer to Figures 4 to 5 , the two side walls of the moving conductive rod 21 where the sliding grooves 211 are formed are respectively a first groove wall 212 and a second groove wall 213, and the first groove wall 212 and the second groove wall 213 extend radially outward along the moving conductive rod 21 and are gradually inclined toward the opposite sides of the two to form an inclined surface.

[0048] With such a setting, when the guide sleeve 14 is worn after the moving conductive rod 21 is used for a long time, rotate the threaded sleeve 32. The elastically arranged guide sleeve 14 moves toward the direction close to the moving conductive rod 21 under the resistance of the second guide surface 311 and forms a limit on it. The sliding strip 143 moves toward the direction close to the moving conductive rod 21 under the resistance of the second guide surface 311 of the elastically arranged guide sleeve 14. The sliding strip 143 moves toward the direction close to the sliding groove 211 and closely fits with the first groove wall 212 and the second groove wall 213 to form a limit, making it difficult for the moving conductive rod 21 to twist. Therefore, the setting of the first groove wall 212 and the second groove wall 213 enables the moving conductive rod 21 to still rotate the threaded sleeve 32 when the guide sleeve 14 is worn after long-term use. The sliding strip 143 moves toward the direction close to the sliding groove 211 and closely fits with the first groove wall 212 and the second groove wall 213 to form a better limit effect, increasing the service life of the guide sleeve 14.

[0049] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A movable conductive rod for a vacuum interrupter, characterized in that: It comprises an airtight insulation system (10), a conductive system (20), a limit assembly (30) and a shielding cylinder (40); The airtight insulation system (10) comprises a porcelain shell (11), a movable end cover plate (12), a static end cover plate (13) and a guide sleeve (14); the movable end cover plate (12) and the static end cover plate (13) are respectively covered at two ends of the porcelain shell (11); and the guide sleeve (14) is arranged on the movable end cover plate (12); The conductive system (20) comprises a dynamic conductive rod (21) and a static conductive rod (22), wherein the dynamic conductive rod (21) and the static conductive rod (22) are respectively vertically mounted on the dynamic end cover plate (12) and the static end cover plate (13), and both extend into the ceramic shell (11); The limiting assembly (30) comprises a limiting ring (31) and a threaded sleeve (32), wherein the limiting ring (31) is connected to the threaded sleeve (32), the guide sleeve (14) is sleeved on the movable conductive rod (21), a limiting groove (141) is provided on the guide sleeve (14), the threaded sleeve (32) is arranged in the limiting groove (141) by threaded rotation, a first guide surface (142) is obliquely arranged on one side of the limiting groove (141) close to the movable conductive rod (21), and a second guide surface (311) matching the first guide surface (142) is arranged on the limiting ring (31), and the first guide surface (142) and the second guide surface (311) are abutted against each other.

2. The movable conductive rod for a vacuum interrupter according to claim 1, characterized in that: The movable conductive rod (21) is provided with a plurality of slide grooves (211) extending along the moving direction of the movable conductive rod (21), and the guide sleeve (14) is provided with a plurality of slide bars (143) matching the slide grooves (211).

3. The movable conductive rod for a vacuum interrupter according to claim 2, characterized in that: The two side walls formed on the sliding groove (211) of the movable conductive rod (21) are respectively a first groove wall (212) and a second groove wall (213); the first groove wall (212) and the second groove wall (213) extend radially outwardly of the movable conductive rod (21) and gradually tilt toward opposite directions therebetween to form an inclined surface.

4. A movable conductive rod for a vacuum interrupter according to any one of claims 1 to 3, characterized in that: A gap is provided between the side of the limiting ring (31) close to the first guide surface (142) and the inner wall of the limiting groove (141), and the side of the threaded sleeve (32) away from the guide sleeve (14) is connected to a knob (34) via a connecting sleeve (33).

5. The movable conductive rod for a vacuum interrupter according to claim 4, characterized in that: The airtight insulation system (10) comprises a bellows (15) and a bellows shielding cover (16); the bellows shielding cover (16) is fixedly sleeved on a moving conductive rod (21); the bellows (15) is arranged around the side of the moving conductive rod (21) and has two ends respectively fixed on a moving end cover plate (12) and the bellows shielding cover (16).

6. The movable conductive rod for a vacuum interrupter according to claim 1, characterized in that: The conductive system (20) further comprises a moving contact (23) and a stationary contact (24), wherein the moving contact (23) and the stationary contact (24) are respectively arranged at the ends of the moving conductive rod (21) and the stationary conductive rod (22), and the moving contact (23) and the stationary contact (24) can contact each other to achieve electrical connection when the moving conductive rod (21) moves.

7. The movable conductive rod for a vacuum interrupter according to claim 6, characterized in that: The shielding cylinder (40) is fixed in the porcelain shell (11) and covers the moving contact (23) and the stationary contact (24).

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