Mechanical bypass switch with false closing prevention

Abstract

The application relates to a mistaken closing prevention mechanical bypass switch, which comprises an insulating frame, a static side guide rail, a vacuum arc extinguishing chamber, a dynamic side guide rail, an insulating pull rod and a double magnetic circuit permanent magnetic operating mechanism. The double magnetic circuit permanent magnetic operating mechanism comprises an operating shell, an operating rod and a permanent magnetic assembly. The permanent magnetic assembly comprises a dynamic iron core, a coil, a permanent magnet, a magnetic conductive ring, a reset opening spring and a contact spring. The dynamic iron core is sleeved on the outer wall of the operating rod near the cover plate. The permanent magnet and the magnetic conductive ring are arranged between the outer wall of the dynamic iron core and the inner wall of the magnetic cylinder. A limiting support section is arranged on the inner wall of the magnetic cylinder. One side of the coil is sleeved on the outer wall of the limiting support section, and the other side extends to the outer wall of the dynamic iron core. When the product is in an opening position, the downward suction force generated by the double magnetic circuit permanent magnetic operating mechanism is balanced with the upward opening spring force and the arc extinguishing chamber self-closing force, so that the product is kept in the opening position. Even if the permanent magnetic holding force disappears, the opening spring can keep the product in the opening position, and the mistaken closing prevention function is realized.

Description

Technical Field

[0001] This invention relates to a bypass switch, specifically a mechanical bypass switch designed to prevent accidental closing. Background Technology

[0002] Bypass switches, as a type of switch, are widely used in products such as flexible DC converter valves and SVG. When a flexible DC converter valve or SVG submodule fails, the bypass submodule is activated to ensure the normal operation of the flexible DC converter valve or SVG system and improve system reliability.

[0003] Existing bypass switch solutions, such as Figure 1 As shown, an insulating shell 1 is used for fixing, a vacuum interrupter 2 is used for interruption, an insulating pull rod 3 is used for potential isolation, and a dual magnetic circuit permanent magnet mechanism 4 is used for driving. The dual magnetic circuit permanent magnet mechanism 4 used for driving adopts a miniaturized permanent magnet operating system as described in patent CN112509879A, which includes an operating shell, which includes a shell body, a left sealing plate, and a right sealing plate; an operating rod installed in the operating shell; and a permanent magnet operating component built into the operating shell, which includes a permanent magnet, a magnetic ring, a moving iron core, and an electromagnetic coil installed in the inner cavity of the shell body.

[0004] When using the permanent magnet operating system described in the aforementioned patent for opening and closing operations, when the product is in the open position, the downward attraction generated by the dual magnetic circuit formed by the permanent magnet operating component balances the upward closing spring, keeping the product in the open position. However, after long-term operation, the performance of the permanent magnet will inevitably degrade or wear out, leading to increased magnetic resistance. This disrupts the mechanical balance, causing an imbalance between the downward attraction generated by the dual magnetic circuit and the upward closing spring force, ultimately resulting in accidental closing and affecting the smooth operation of the bypass switch. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a mechanical bypass switch that can effectively prevent accidental closing.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a mechanical bypass switch to prevent accidental closing, the innovation of which lies in: including

[0007] An insulating frame, comprising a frame body and a frame cover plate, having an inner cavity within the frame body for mounting a container.

[0008] The stationary side guide, vacuum interrupter, moving side guide, insulating tie rod, and dual magnetic circuit permanent magnet operating mechanism are arranged sequentially in the inner cavity of the insulating frame.

[0009] The dual-magnetic-circuit permanent magnet operating mechanism includes an operating housing, an operating lever, and a permanent magnet assembly;

[0010] The operating housing includes a magnetic cylinder and a cover plate. The magnetic cylinder is located on the side close to the insulating pull rod and has an inner cavity for mounting a container, so that the cross-section of the magnetic cylinder is U-shaped. The cover plate is connected to the side of the magnetic cylinder away from the insulating pull rod and seals the inner cavity of the magnetic cylinder.

[0011] The operating rod is horizontally placed in the inner cavity of the magnetic cylinder, and the two sides of the operating rod extend from the magnetic cylinder and the cover plate respectively. A first through hole is opened on the magnetic cylinder to allow the operating rod to extend, and a second through hole is opened on the cover plate to allow the operating rod to extend. After the operating rod extends from the magnetic cylinder, it is connected to the insulating pull rod.

[0012] The permanent magnet assembly includes a moving iron core, a coil, a permanent magnet, a magnetic ring, a reset opening spring, and a contact spring. The moving iron core is fitted onto the outer wall of the operating rod near the cover plate and drives the operating rod to reciprocate. A permanent magnet and a magnetic ring are also provided between the outer wall of the moving iron core and the inner wall of the magnetic cylinder. A limiting support section that cooperates with the moving iron core is also provided on the inner wall of the magnetic cylinder, with a gap between the limiting support section and the moving iron core. One side of the coil is fitted onto the outer wall of the limiting support section, and the other side of the coil extends to the outer wall of the moving iron core. One end of the coil is in contact with the inner wall of the magnetic cylinder, and the other end of the coil is in contact with the permanent magnet and the magnetic ring. The reset opening spring and the contact spring are both fitted onto the outside of the operating rod. A first cavity for installing the reset opening spring is also opened in the limiting support section, and a second cavity for installing the reset opening spring and the contact spring is also opened in the moving iron core.

[0013] Furthermore, a magnetic guide plate is provided between the moving iron core and the cover plate. The magnetic guide plate is fitted on the outer wall of the moving iron core, and a gap is left between the magnetic guide plate and the inner wall of the magnetic cylinder.

[0014] Furthermore, the section of the operating lever located on the set of reset opening spring is defined as the first section, and the section of the operating lever located on the set of contact spring is defined as the second section. The diameter of the first section is larger than the diameter of the second section. One side of the contact spring abuts against the end of the first section, and the other side abuts against the inner wall of the moving iron core. One side of the reset opening spring abuts against the inner wall of the limit support section, and the other side abuts against the end of the contact spring.

[0015] Furthermore, a T-shaped guide sleeve is provided between the operating rod and the magnetic cylinder. The T-shaped guide sleeve is directly fitted onto the outer circumferential wall of the operating rod, and the end of the T-shaped guide sleeve abuts against the inner wall of the limiting support section.

[0016] Furthermore, the frame cover plate is fixed to the frame body by bolts, and a positioning notch is opened on both sides of the bottom surface of the frame cover plate.

[0017] Furthermore, the section of the operating lever extending from the magnetic cylinder is defined as the third segment. A first limiting protrusion in the shape of a ring is provided on the outer wall of the third segment near the insulating pull rod, and a second limiting protrusion in the shape of an arc is also provided on the outer wall of the third segment near the magnetic cylinder.

[0018] The advantages of this invention are as follows: In this invention, by arranging and designing the various components in the dual-magnetic circuit permanent magnet operating mechanism, when the product is in the open position, the downward attraction force generated by the dual-magnetic circuit permanent magnet operating mechanism is superimposed with the upward opening spring force and the self-closing force of the arc-extinguishing chamber, so that the product is kept in the open position. Even if the permanent magnet holding force disappears, the opening spring can still keep the product in the open position, thus realizing the function of preventing accidental closing.

[0019] The magnetic guide plate added between the moving iron core and the cover plate works in conjunction with the moving iron core to form an auxiliary magnetic circuit.

[0020] The reset opening spring and contact spring are installed using a combination of first and second sections with different dimensions. This ensures that the installation positions of the reset opening spring and contact spring are fixed, avoiding uncertainty in their initial installation positions, which could affect subsequent smooth use.

[0021] By designing positioning notches on the frame cover plate to facilitate the connection between the frame cover plate and the frame body, it is possible to quickly position and fix the frame cover plate and the frame body, thereby reducing assembly time.

[0022] The design of the first and second limit protrusions on the operating rod is to limit the relative position of the operating rod and the insulating pull rod when the operating rod is in conjunction with the magnetic cylinder, and also to limit the stroke of the operating rod into the magnetic cylinder, so as to prevent the operating rod from exceeding the stroke limit and affecting the smooth operation of subsequent opening and closing. Attached Figure Description

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 This is a schematic diagram of an existing bypass switch.

[0025] Figure 2 This is a schematic diagram of the anti-accidental closing mechanical bypass switch of the present invention.

[0026] Figure 3 This is a cross-sectional view of the anti-misoperation mechanical bypass switch of the present invention.

[0027] Figure 4 for Figure 3 Enlarged schematic diagram of part A. Detailed Implementation

[0028] The following embodiments are intended to enable those skilled in the art to more fully understand the present invention, but do not limit the invention to the scope of the embodiments described.

[0029] like Figures 2-4 The illustrated mechanical bypass switch for preventing accidental closing includes

[0030] An insulating frame includes a frame body 11 and a frame cover plate 16. The frame body 11 is a hollow cuboid structure with an open top and an inner cavity for mounting components. The frame cover plate 16 is a rectangular plate and is fixed to the frame body 11 by bolts. A threaded blind hole for the bolts is opened on the upper surface of the frame body 11, and a through hole for the bolts to pass through is opened on the frame cover plate 16. A positioning notch is also opened on both sides of the bottom surface of the frame cover plate 16. By designing positioning notches on the frame cover plate, the connection between the frame cover plate 16 and the frame body 11 can be realized, thereby enabling quick positioning and fixing between the frame cover plate 16 and the frame body 11 and reducing assembly time.

[0031] The stationary side guide 12, vacuum interrupter 13, moving side guide 14, insulating pull rod 15, and dual magnetic circuit permanent magnet operating mechanism are arranged sequentially in the inner cavity of the frame body 11. The stationary side guide 12 and moving side guide 14 are respectively connected to the two sides of the vacuum interrupter 13, and the upper ends of the stationary side guide 12 and moving side guide 14 extend out of the inner cavity of the frame body 11. At the same time, through holes are opened on the frame cover plate 16 to allow the stationary side guide 12 and moving side guide 14 to pass through. One side of the insulating pull rod 15 is connected to the vacuum interrupter 13 through a connecting rod.

[0032] The dual-magnetic-circuit permanent magnet operating mechanism includes an operating housing, an operating lever 21, and a permanent magnet assembly.

[0033] The operating housing includes a magnetic cylinder 22 and a cover plate 23. The magnetic cylinder 22 is located on the side close to the insulating pull rod 15. The magnetic cylinder 22 has an inner cavity for mounting a container, so that the cross-section of the magnetic cylinder 22 is U-shaped. The cover plate 23 is connected to the side of the magnetic cylinder 22 away from the insulating pull rod and seals the inner cavity of the magnetic cylinder 22. The cover plate 23 is fixed to the magnetic cylinder 22 by screws. After the cover plate 23 and the magnetic cylinder 22 are connected, they together form a hollow cylindrical operating housing.

[0034] The operating rod 21 is horizontally placed in the inner cavity of the magnetic cylinder 22, and the two sides of the operating rod 21 extend from the magnetic cylinder 22 and the cover plate 23 respectively. The magnetic cylinder 22 also has a first through hole to accommodate the extension of the operating rod 21, and the cover plate 23 has a second through hole to accommodate the extension of the operating rod 21. After the operating rod 21 extends from the magnetic cylinder, it is connected to the insulating pull rod 15.

[0035] The permanent magnet assembly includes a moving iron core 24, a coil 25, a permanent magnet 26, a magnetic ring 27, a reset opening spring 28, and a contact spring 29. The moving iron core 24 is fitted onto the outer wall of the operating rod 21 and is located on the outer wall of the operating rod 21 near the cover plate 23. The moving iron core 24 is fixedly connected to the operating rod 21 and drives the operating rod 21 to reciprocate. The moving iron core 24 is cylindrical and has a through hole in the middle of the moving iron core 24 for the operating rod 21 to pass through and be installed. On the side of the moving iron core 24 near the cover plate 23, there is also an extension section extending towards the cover plate 23, so that the overall cross-section of the moving iron core 24 is T-shaped. The cover plate 23 also has a through hole for the extension section to pass through and move.

[0036] A magnetic guide plate 31 is also provided between the moving iron core 24 and the cover plate 23. The magnetic guide plate 31 is fitted onto the outer wall of the moving iron core 24. The magnetic guide plate 31 is a circular plate with a through hole in the middle to allow the extension of the moving iron core 24 to pass through. A gap is left between the outer circumference of the magnetic guide plate 31 and the inner wall of the magnetic cylinder 22. The magnetic guide plate 31 added between the moving iron core 24 and the cover plate 23 cooperates with the moving iron core 24 to form an auxiliary magnetic circuit.

[0037] A permanent magnet 26 and a magnetic ring 27 are provided between the outer circumference of the moving iron core 24 and the inner wall of the magnetic cylinder 22. Both the permanent magnet 26 and the magnetic ring 27 are ring-shaped and are fitted onto the outer circumference of the moving iron core 24 from the outside to the inside. The inner wall of the magnetic ring 27 is in contact with the outer wall of the moving iron core 24, and the outer wall of the permanent magnet 26 is in contact with the inner wall of the magnetic cylinder 22. A limiting support section 30 that cooperates with the moving iron core 24 is also provided on the inner wall of the magnetic cylinder 22. The limiting support section 30 is cylindrical and there is a gap between the limiting support section 30 and the moving iron core 24. The limiting support section 30 plays a role in limiting the travel of one side of the moving iron core 24 to prevent the moving iron core 24 from moving beyond the limit.

[0038] A T-shaped guide sleeve is also provided between the operating lever 21 and the magnetic cylinder 22. The T-shaped guide sleeve is directly fitted onto the outer circumferential wall of the operating lever 21, and the end of the T-shaped guide sleeve abuts against the inner wall of the limiting support section 30.

[0039] One side of the coil 25 is fitted onto the outer wall of the limiting support section 30, and the other side of the coil 25 extends to the outer wall of the moving iron core 247. One end of the coil 25 is in contact with the inner wall of the magnetic cylinder 22, and the other end of the coil 25 is in contact with the permanent magnet 26 and the magnetic ring 27.

[0040] The reset opening spring 28 and the contact spring 29 are both mounted on the outside of the operating rod. A first cavity for installing the reset opening spring 28 is also opened in the limit support section 30, and a second cavity for installing the reset opening spring 28 and the contact spring 29 is also opened in the moving iron core 24.

[0041] The section of the operating lever 21 located within the set of reset opening spring 28 is defined as the first segment 211, and the section of the operating lever 21 located within the set of contact spring 29 is defined as the second segment 212. The diameter of the first segment 211 is larger than the diameter of the second segment 212. One side of the contact spring 29 abuts against the end of the first segment 211, and the other side abuts against the inner wall of the moving iron core 24. One side of the reset opening spring 28 abuts against the inner wall of the limit support section 30, and the other side abuts against the end of the contact spring 28. The reset opening spring 28 and the contact spring 29 are installed using the first segment 211 and the second segment 212, which have different dimensions. This ensures that the installation positions of the reset opening spring 28 and the contact spring 29 are fixed, avoiding uncertainty in their initial installation positions, which could affect subsequent smooth operation.

[0042] The section of the operating lever 21 extending from the magnetic cylinder is defined as the third segment 213. A first limiting protrusion 32 in the shape of an annulus is provided on the outer wall of the third segment 213 near the insulating pull rod 15. A through hole is opened on the side end of the insulating pull rod 15 to accommodate the side end of the operating lever 21. The size of the through hole on this side of the insulating pull rod 15 is smaller than the size of the first limiting protrusion 32. A second limiting protrusion 33 in the shape of an arc is also provided on the outer wall of the third segment 213 near the magnetic cylinder 22. A gasket is also fitted on the outer wall of the operating lever 21. The gasket is located between the second limiting protrusion 33 and the outer wall of the magnetic cylinder 22. The design of the first limiting protrusion 32 and the second limiting protrusion 33 on the operating rod 21 is to limit the relative position of the operating rod 21 and the insulating pull rod 15 when the operating rod 21 cooperates with the insulating pull rod 15 and the magnetic cylinder 22, and at the same time limit the stroke of the operating rod 21 into the magnetic cylinder 22, so as to prevent the stroke of the operating rod 21 from exceeding the limit and affecting the smooth operation of subsequent opening and closing.

[0043] The anti-misoperation mechanical bypass switch of this invention, through the arrangement design of the various components in the dual magnetic circuit permanent magnet operating mechanism, places the moving iron core 24 on the side closer to the cover plate 23, while the coil 25 is closer to the insulating pull rod 15 than the moving iron core 24. With this design, when the product is in the open position, the downward attraction generated by the dual magnetic circuit permanent magnet operating mechanism, combined with the upward opening spring force and the self-closing force of the arc-extinguishing chamber 1, balances the product in the open position. Even if the holding force of the permanent magnet lift 26 disappears, the product can still be held in the open position through the cooperation of the opening spring, namely the reset opening spring 28 and the contact spring 29, thus realizing the anti-misoperation function.

[0044] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical bypass switch to prevent accidental closing, characterized in that: include An insulating frame, comprising a frame body and a frame cover plate, having an inner cavity within the frame body for mounting a container. The stationary side guide, vacuum interrupter, moving side guide, insulating tie rod, and dual magnetic circuit permanent magnet operating mechanism are arranged sequentially in the inner cavity of the insulating frame. The dual-magnetic-circuit permanent magnet operating mechanism includes an operating housing, an operating lever, and a permanent magnet assembly; The operating housing includes a magnetic cylinder and a cover plate. The magnetic cylinder is located on the side close to the insulating pull rod and has an inner cavity for mounting a container, so that the cross-section of the magnetic cylinder is U-shaped. The cover plate is connected to the side of the magnetic cylinder away from the insulating pull rod and seals the inner cavity of the magnetic cylinder. The operating rod is horizontally placed in the inner cavity of the magnetic cylinder, and the two sides of the operating rod extend from the magnetic cylinder and the cover plate respectively. A first through hole is opened on the magnetic cylinder to allow the operating rod to extend, and a second through hole is opened on the cover plate to allow the operating rod to extend. After the operating rod extends from the magnetic cylinder, it is connected to the insulating pull rod. The permanent magnet assembly includes a moving iron core, a coil, a permanent magnet, a magnetic ring, a reset opening spring, and a contact spring. The moving iron core is fitted onto the outer wall of the operating rod near the cover plate and drives the operating rod to reciprocate. A permanent magnet and a magnetic ring are also provided between the outer wall of the moving iron core and the inner wall of the magnetic cylinder. A limiting support section that cooperates with the moving iron core is also provided on the inner wall of the magnetic cylinder, with a gap between the limiting support section and the moving iron core. One side of the coil is fitted onto the outer wall of the limiting support section, and the other side of the coil extends to the outer wall of the moving iron core. One end of the coil is in contact with the inner wall of the magnetic cylinder, and the other end of the coil is in contact with the permanent magnet and the magnetic ring. The reset opening spring and the contact spring are both fitted onto the outside of the operating rod. A first cavity for installing the reset opening spring is also opened in the limiting support section, and a second cavity for installing the reset opening spring and the contact spring is also opened in the moving iron core. A magnetic guide plate is also provided between the moving iron core and the cover plate. The magnetic guide plate is fitted on the outer wall of the moving iron core, and a gap is left between the magnetic guide plate and the inner wall of the magnetic cylinder. The first segment is defined as the section of the operating lever located on the set reset opening spring, and the second segment is defined as the section of the operating lever located on the set contact spring. The diameter of the first segment is larger than the diameter of the second segment. One side of the contact spring abuts against the end of the first segment, and the other side abuts against the inner wall of the moving iron core. One side of the reset opening spring abuts against the inner wall of the limit support section, and the other side abuts against the end of the contact spring. A T-shaped guide sleeve is also provided between the operating lever and the magnetic cylinder. The T-shaped guide sleeve is directly fitted onto the outer circumferential wall of the operating lever, and the end of the T-shaped guide sleeve abuts against the inner wall of the limiting support section. The frame cover plate is fixed to the frame body by bolts, and a positioning notch is opened on both sides of the bottom surface of the frame cover plate. The section of the operating lever extending from the magnetic cylinder is defined as the third segment. A first limiting protrusion in the shape of a ring is provided on the outer wall of the third segment near the insulating pull rod. A second limiting protrusion in the shape of an arc is also provided on the outer wall of the third segment near the magnetic cylinder.

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