Transmission structure of vacuum interrupter

Abstract

The utility model relates to the transmission field of vacuum arc-extinguishing chamber, disclose a transmission structure of vacuum arc-extinguishing chamber, including static end support, vacuum arc-extinguishing chamber, flexible conductor, disc spring group, pull rod cylinder subassembly, driven rod, movable end support, fluted wheel, mutually combine use play a role, can apply in parallel transfer open break load switch vacuum arc-extinguishing chamber transmission, also can be used for the transmission when vacuum arc-extinguishing chamber as conventional circuit breaker switch, this transmission structure can design the opening and closing keeping section, cope with the excessive rotation of transmission mechanism, avoid the harm of vacuum arc-extinguishing chamber from the opening and closing overshoot, especially the problem that the too big opening and closing overshoot will pull the corrugated pipe inside vacuum arc-extinguishing chamber, in addition can satisfy the demand of overtravel simple adjustment, and through the groove of special shape on the primary transmission arm design, directly drive the opening and closing of vacuum arc-extinguishing chamber, save the secondary transmission arm, use less parts, less fault point, do not have the reset spring located at the end, and the safety factor is higher.

Description

Technical Field

[0001] This utility model relates to the field of vacuum interrupter transmission, specifically a transmission structure for a vacuum interrupter. Background Technology

[0002] Vacuum interrupters, also known as vacuum switch tubes, are core components of medium and high voltage power switches. Their main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit is cut off by utilizing the excellent insulation of the vacuum inside the tube, thus preventing accidents and incidents.

[0003] For example, Chinese patent CN112509859A discloses an environmentally friendly load switch that uses a parallel transfer switching scheme with vacuum interrupters. This requires a two-stage transmission to achieve coordination between the interrupter and the main switch. When the main switch is open, the isolating switch drives the primary transmission arm, which rotates against the secondary transmission arm, causing the secondary transmission arm to open. When the main switch is closed, the isolating switch reverses the primary transmission arm's rotation. At this point, the primary transmission arm disengages from the secondary transmission arm and does not reverse its rotation, thus releasing the linkage between the main switch and the interrupter. This type of solution requires a set of springs to reset the primary transmission arm after reverse rotation. The spring wires have pointed ends, which, when used in high-voltage main switches, can affect the partial discharge level due to uneven voltage treatment. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a transmission structure for a vacuum interrupter to solve the aforementioned problems.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0006] A transmission structure for a vacuum interrupter includes a stationary end support, a vacuum interrupter, a flexible conductor, a disc spring assembly, a tie rod cylinder assembly, a driven rod, a moving end support, and a grooved wheel.

[0007] The pull rod cylinder assembly has a contact spring inserted inside its internal circular hole, and a core rod is also fitted inside the internal circular hole of the pull rod cylinder assembly, with the core rod and the contact spring pressing against each other.

[0008] The driven rod is sequentially inserted into the waist holes on both sides of the pull rod cylinder and the round hole on the core rod body.

[0009] The end of the pull rod assembly corresponding to the vacuum interrupter is a stud structure, and the stud structure is inserted into the disc spring assembly and the flexible conductor in sequence before being screwed into the vacuum interrupter.

[0010] The vacuum interrupter is threadedly connected to the stationary end support. The vacuum interrupter is divided into a stationary end and a moving end. The stationary end is connected to the stationary end support, and the moving end is connected to the core rod.

[0011] The grooved wheel is mounted on both sides of the driven rod, which can be used for the transmission of vacuum interrupters in parallel transfer load switching, and can also be used for the transmission of vacuum interrupters when they are used as conventional circuit breaker switches. This transmission structure can be designed with a closing and opening holding section to deal with excessive rotation of the transmission mechanism and avoid damage to the vacuum interrupter from opening and closing overshoot. In particular, a large opening overshoot can damage the bellows inside the vacuum interrupter. In addition, it can meet the requirements of easy overtravel adjustment. Furthermore, by designing a specially shaped groove on the first-stage transmission arm, the opening and closing of the vacuum interrupter can be directly driven, eliminating the need for a second-stage transmission arm. This results in fewer parts, fewer failure points, and no return spring at the end, thus increasing the safety factor.

[0012] Preferably, the grooved wheel is provided with a groove, a shaft hole, and a support shaft, the groove is used to engage the driven rod, and the shaft hole is fixed by the support shaft.

[0013] Preferably, the moving end bracket is provided with a core hole for limiting the movement of the core rod.

[0014] Compared to existing technologies, this utility model discloses a transmission structure for a vacuum interrupter, including a stationary end support, a vacuum interrupter, a flexible conductor, a disc spring assembly, a pull rod cylinder assembly, a driven rod, a moving end support, and a grooved wheel. These components work together to function and can be used for the transmission of vacuum interrupters in parallel transfer load switching, as well as for the transmission of vacuum interrupters when used as conventional circuit breaker switches. This transmission structure can be designed with a closing and opening holding section to handle excessive rotation of the transmission mechanism and prevent damage to the vacuum interrupter from opening and closing overshoot. In particular, excessive opening overshoot can damage the bellows inside the vacuum interrupter. In addition, it can meet the requirements for easy overtravel adjustment. Furthermore, by designing a specially shaped groove on the primary transmission arm, the closing and opening of the vacuum interrupter can be directly driven, eliminating the need for a secondary transmission arm. This results in fewer parts, fewer potential failure points, and a higher safety factor as there is no return spring at the end. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the transmission structure of the vacuum interrupter of this utility model;

[0016] Figure 2 This is a cross-sectional schematic diagram of the transmission structure of the vacuum interrupter of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the pull rod cylinder assembly and the driven rod of this utility model;

[0018] Figure 4 This is a schematic diagram of the closed position of the vacuum interrupter chamber of this utility model;

[0019] Figure 5 This is a schematic diagram of the rigid opening or closing position of the vacuum interrupter chamber of this utility model;

[0020] Figure 6 This is a schematic diagram of the open position of the vacuum interrupter chamber of this utility model;

[0021] Figure 7 This is a schematic diagram of the closed position of the vacuum interrupter chamber of this utility model;

[0022] Figure 8 This is a schematic diagram of the grooved wheel structure used in the load switch transfer and disconnection structure of this utility model;

[0023] Figure 9 This is a schematic diagram of the grooved wheel structure used in the circuit breaker switch transmission structure of this utility model. 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 of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] A transmission structure for a vacuum interrupter includes a stationary end support 1, a vacuum interrupter 2, a flexible conductor 3, a disc spring assembly 4, a pull rod cylinder assembly 5, a driven rod 6, a moving end support 7, and a grooved wheel 8.

[0026] The pull rod cylinder assembly 5 has a contact spring 52 inserted inside its internal circular hole, and a core rod 51 is also fitted inside the internal circular hole of the pull rod cylinder assembly 5, with the core rod 51 and the contact spring 52 pressing against each other.

[0027] The driven rod 6 is inserted sequentially into the waist holes on both sides of the pull rod cylinder assembly 5 and the round hole on the rod body of the core rod 51.

[0028] The pull rod assembly 5 has a stud structure at one end corresponding to the vacuum interrupter 2. The stud structure passes through the disc spring assembly 4 and the flexible conductor 3 in sequence and is then screwed into the vacuum interrupter 2. The flexible conductor 3 is generally a wire or a flexible connector.

[0029] The vacuum interrupter 2 is threadedly connected to the stationary end support 1. The vacuum interrupter 2 is divided into a stationary end and a moving end. The stationary end is connected to the stationary end support 1 by bolts, and the moving end is connected to the core rod 51.

[0030] The grooved wheel 8 is mounted on both sides of the driven rod 6.

[0031] The grooved wheel 8 is provided with a groove 81, a shaft hole 82, and a support shaft 83. The groove 81 is engaged with the driven rod 6, the shaft hole 82 is fixed by the support shaft 83, and the grooved wheel 8 pivots along the axis of the support shaft 83.

[0032] The moving end bracket 7 is provided with a core hole 71 to limit the movement of the core rod 51 and ensure that the movement direction of the vacuum interrupter 2 is along its axis. The moving end bracket 7 is also provided with waist holes on both sides corresponding to the positions through which the driven rod 6 passes.

[0033] This transmission structure allows for the initial release of the stationary end of the vacuum interrupter 2, followed by rotation of the vacuum interrupter 2 to adjust the position of the pull rod cylinder assembly 5. The position of the driven rod 6 during closing is fixed by the groove 81. During adjustment, the waist hole of the pull rod cylinder assembly 5 displaces relative to the driven rod 6, thus adjusting the overtravel distance. The change in height D of the disc spring assembly 4 during adjustment should be within the design range. Within this range, the disc spring assembly 4 can provide reliable contact force between the flexible conductor 3 and the moving end of the vacuum interrupter 2.

[0034] The overtravel of this transmission structure affects the instantaneous opening time of vacuum interrupter 2. A larger overtravel results in a later instantaneous opening time, while a smaller overtravel results in an earlier instantaneous opening time. Based on this principle, the synchronous opening time of the three-phase interrupter can be adjusted.

[0035] The end of the core rod 51 can be designed with a connection structure, such as a thread, to connect a displacement sensor to test the time displacement parameters of the vacuum interrupter 2.

[0036] Operating conditions:

[0037] The driven rod 6 and the grooved wheel 8 are designed with an approximate cam structure. When the vacuum interrupter 2 is opened, the driven rod 6 is driven by the grooved wheel 8 to move from one end of the waist hole of the pull rod cylinder assembly 5 to the other end, releasing the pressure of the contact spring 52 on the moving end of the vacuum interrupter 2. The contacts inside the vacuum interrupter 2 are about to separate, which is defined as the just-opening position. The overtravel segment of the total stroke of the vacuum interrupter 2 is from closing to just opening. Then the grooved wheel 8 continues to rotate, driving the driven rod 6 to abut against the pull rod cylinder assembly 5, displacing it to the rated opening distance of the vacuum interrupter 2, and the opening position is reached. The opening distance segment of the total stroke is from just opening to opening. The curve change rate of the groove 81 during the closing and opening stroke segments is used to meet the speed requirements of the vacuum interrupter 2. For example, the speed should be fast and the curvature change should be relatively steep for the first 20% of the stroke, while the speed should be slower and the curvature change should be gentle for the last 20% of the stroke.

[0038] When this transmission structure is used in the load switch transfer and disconnection structure, a lever arm, or crank arm, is designed on the groove wheel 8. It is turned by the closing and opening of the isolating knife. At the same time, a section of equal radius stroke is extended along the closing groove 81 section of the groove wheel 8 to ensure that the groove wheel 8 can rotate in the opposite direction when the isolating knife is closed, so as to make room for the isolating knife to close. The position of the vacuum interrupter 2 is not affected when rotating in the opposite direction.

[0039] To prevent the vacuum interrupter 2 from being pulled too far and damaged when the main cutter arm continues to rotate toward the opening position, a section of opening holding stroke is designed in groove 81.

[0040] When this transmission structure is used in a circuit breaker switch transmission structure, the grooved wheel 8 is driven by the circuit breaker operating mechanism. The closing holding area of ​​equal radius can be shortened, only used to cope with the short-distance overshoot stroke when the transmission mechanism closes. The opening holding stroke is retained to cope with the short-distance overshoot stroke when the transmission mechanism opens, preventing damage to the vacuum interrupter 2.

[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0042] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A transmission structure for a vacuum interrupter, characterized in that: Includes stationary end support (1), vacuum interrupter (2), flexible conductor (3), disc spring assembly (4), tie rod cylinder assembly (5), driven rod (6), moving end support (7), and grooved wheel (8). The pull rod assembly (5) has a contact spring (52) inserted inside its internal circular hole. A core rod (51) is also fitted inside the internal circular hole of the pull rod assembly (5), and the core rod (51) and the contact spring (52) press against each other. The driven rod (6) is inserted sequentially into the waist hole on both sides of the pull rod cylinder assembly (5) and the round hole on the rod body of the core rod (51). The pull rod assembly (5) has a stud structure at one end corresponding to the vacuum interrupter (2), and the stud structure is inserted into the disc spring assembly (4) and the flexible conductor (3) in sequence before being screwed into the vacuum interrupter (2). The vacuum interrupter (2) is threadedly connected to the stationary end support (1). The vacuum interrupter (2) is divided into a stationary end and a moving end. The stationary end is connected to the stationary end support (1), and the moving end is connected to the core rod (51). The grooved wheel (8) is mounted on both sides of the driven rod (6).

2. The transmission structure of the vacuum interrupter according to claim 1, characterized in that: The grooved wheel (8) is provided with a groove (81), a shaft hole (82), and a support shaft (83). The groove (81) is engaged with the driven rod (6), and the shaft hole (82) is fixed by the support shaft (83).

3. The transmission structure of the vacuum interrupter according to claim 1, characterized in that: The moving end bracket (7) is provided with a core hole (71) for limiting the movement of the core rod (51).

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