Opening and closing mechanism for vacuum arc-extinguishing chamber

Abstract

The utility model relates to an opening and closing mechanism for a vacuum arc-extinguishing chamber, which comprises an opening and closing driving shaft, an opening and closing handle and a permanent magnetic mechanism, and is characterized in that the opening and closing driving shaft comprises a main shaft body, and an upper limiting check ring, an upper energy storage spring, a limiting table, a lower energy storage spring and a lower limiting check ring which are sequentially sleeved on the main shaft body from top to bottom; a limiting table is arranged on the main shaft body, a limiting long hole is formed in the position, where the limiting table is arranged, of the main shaft body, an opening and closing pin shaft is arranged on the opening and closing handle, the limiting table is driven by the opening and closing pin shaft to ascend and descend, the opening and closing pin shaft penetrates through the limiting long hole, and the upper end of the main shaft body is connected with a permanent magnet mechanism. And the lower end of the main shaft body is connected with a moving contact in the vacuum arc-extinguishing chamber. According to the utility model, automatic opening and closing control of the vacuum arc-extinguishing chamber can be realized by using the permanent magnetic mechanism, and manual opening and closing control of the vacuum arc-extinguishing chamber can also be realized by using the opening and closing handle to drive the opening and closing driving shaft to lift, so that the use flexibility of a product is improved.

Description

Technical Field

[0001] The utility model relates to the field of electric power equipment, in particular to an opening and closing mechanism for a vacuum interrupter. Background Art

[0002] A vacuum arc chamber is a commonly used electrical device, and it usually needs to be equipped with an operating mechanism. For example, the patent with the authorization announcement number CN2805158Y discloses a grounding switch that uses a vacuum arc chamber to open and close an induced current, wherein the lower end of the vacuum arc chamber is connected to the operating mechanism, and the operating mechanism includes a shift fork, a transmission crank arm, a stepless adjustment flange, a cam, a closing spring device and other structures. Another example is the patent with the authorization announcement number CN216250531U discloses an outdoor column switch with an anti-twist electromagnetic repulsion mechanism, which is used to drive the vacuum arc chamber's opening and closing mechanism, including an action indication device, a drive disk, a magnetic flux coil and a buffer mechanism and other structures. The mechanism uses the coil to generate magnetic flux to generate an electromagnetic force to drive the drive disk to move, thereby completing the closing or disconnecting action of the vacuum arc chamber.

[0003] However, with the development of technology, the structures of many power equipment have changed greatly. For example, some new outdoor pole-mounted protection switches have also added vacuum arc chambers, isolating switches and other structures to ensure that the electrical circuits are completely disconnected. In addition, the opening and closing mechanisms of the device used to control the opening and closing of the vacuum arc chambers have manual operation requirements in addition to automatic operation requirements. Therefore, the opening and closing mechanisms need to be redesigned. Utility Model Content

[0004] The purpose of the utility model is to provide a switch-opening and closing mechanism for a vacuum arc extinguishing chamber, which can not only realize automatic switch-opening and closing control of the vacuum arc extinguishing chamber by utilizing a permanent magnet mechanism, but also realize manual switch-opening and closing control of the vacuum arc extinguishing chamber by utilizing a switch-opening and closing handle to drive the switch-opening and closing drive shaft to rise and fall, thereby improving the flexibility of product use.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A switch-on / off mechanism for a vacuum arc extinguishing chamber comprises a switch-on / off drive shaft and a switch-on / off handle, wherein the switch-on / off drive shaft comprises a main shaft body and an upper limit retaining ring, an upper energy storage spring, a limit platform, a lower energy storage spring and a lower limit retaining ring which are sequentially sleeved on the main shaft body from top to bottom, and a limit long hole is provided at the position where the limit platform is provided on the main shaft body, a switch-on / off pin shaft is provided on the switch-on / off handle, the limit platform is driven to rise and fall by the switch-on / off pin shaft, and the switch-on / off pin shaft passes through the limit long hole, the upper end of the main shaft body is connected to a permanent magnet mechanism, and the lower end of the main shaft body is connected to a moving contact in the vacuum arc extinguishing chamber.

[0007] A handle connecting rod is provided on one side of the opening and closing handle, and a shift fork is provided on the handle connecting rod, and the opening and closing pin shaft is provided on the shift fork.

[0008] The permanent magnet mechanism includes a lifting shaft, and an armature is provided on the lifting shaft. An opening yoke, an opening coil, a permanent magnet, a closing coil and a closing yoke are arranged on the outer side of the armature in sequence from top to bottom. The lower end of the lifting shaft is fixedly connected to the upper end of the main shaft body.

[0009] Two spring retaining rings are sleeved on the middle part of the main shaft body, and the two spring retaining rings are respectively arranged on the upper and lower sides of the limiting platform.

[0010] The upper limit stop ring is fixedly mounted on the main shaft body through an upper pin shaft, and the lower limit stop ring is fixedly mounted on the main shaft body through a lower pin shaft.

[0011] The upper end of the main shaft body is provided with a threaded section which is threadedly fixedly connected with the lower end of the lifting shaft.

[0012] An overtravel adjustment rod and an overtravel spring are provided at the lower end of the main shaft body, wherein the overtravel spring is arranged between the lower limit retaining ring and the upper end of the overtravel adjustment rod, and the lower end of the overtravel adjustment rod is connected to the moving contact in the vacuum interrupter.

[0013] A mounting long hole is provided at the lower end of the main shaft body, the overtravel adjustment rod is installed on the main shaft body through an adjustment rod pin shaft, and the adjustment rod pin shaft passes through the mounting long hole.

[0014] The advantages and positive effects of the utility model are:

[0015] 1. The utility model can not only realize automatic opening and closing control of the vacuum interrupter by using the permanent magnet mechanism, but also realize manual opening and closing control of the vacuum interrupter by using the opening and closing handle to drive the opening and closing drive shaft to rise and fall, thereby improving the flexibility of product use.

[0016] 2. The utility model can ensure that the opening and closing handles can automatically return to their original positions after being released through the energy storage design of the upper and lower energy storage springs. In addition, the utility model ensures that the main shaft body is always raised and lowered within the set range when manually operated through the overtravel adjustment rod and overtravel spring design at the lower end of the main shaft body, thereby not affecting the automatic operation control of the permanent magnet mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall schematic diagram of the utility model.

[0018] Figure 2 for Figure 1 Enlarged schematic diagram of the center opening and closing drive shaft,

[0019] Figure 3 for Figure 2 Schematic diagram of the exploded view of the center opening and closing drive shaft.

[0020] Figure 4 for Figure 2 Schematic diagram of the internal structure of the permanent magnet mechanism.

[0021] Figure 5 The figure is a schematic diagram of the structure of an outdoor column switch using the utility model.

[0022] Among them, 1 is the opening and closing driving shaft, 101 is the upper limit retaining ring, 1011 is the upper pin shaft, 102 is the upper energy storage spring, 103 is the spring retaining ring, 104 is the lower energy storage spring, 105 is the lower limit retaining ring, 1051 is the lower pin shaft, 106 is the overtravel spring, 107 is the overtravel adjusting rod, 1071 is the adjusting rod pin shaft, 108 is the main shaft body, 1081 is the limit long hole, 109 is the limit platform, 2 is the opening and closing handle, 201 is the handle connecting rod, 202 is the shift fork, 203 is the opening and closing pin shaft, 204 is the indicator needle, 3 is the vacuum interrupter, 4 is the permanent magnet mechanism, 401 is the lifting shaft, 402 is the armature, 403 is the permanent magnet, 404 is the closing coil, 405 is the opening coil, 406 is the opening yoke, 407 is the closing yoke, and 5 is the vacuum interrupter cavity. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] like Figures 1 to 5 As shown, the utility model comprises a switch-on / off drive shaft 1, a switch-on / off handle 2 and a permanent magnet mechanism 4, wherein Figures 2-3 As shown, the opening and closing drive shaft 1 includes a main shaft body 108 and an upper limit retaining ring 101, an upper energy storage spring 102, a limit platform 109, a lower energy storage spring 104 and a lower limit retaining ring 105 which are sequentially sleeved on the main shaft body 108 from top to bottom, wherein a limit long hole 1081 is provided at the position where the limit platform 109 is provided on the main shaft body 108, a handle connecting rod 201 is provided on one side of the opening and closing handle 2, and a shift fork 202 is provided on the handle connecting rod 201, and an opening and closing pin shaft 203 is provided on the shift fork 202, the limit platform 109 is driven to rise and fall by the opening and closing pin shaft 203, and the opening and closing pin shaft 203 passes through the limit long hole 1081, as shown in FIG. Figure 4 As shown, the permanent magnet mechanism 4 includes a lifting shaft 401, and an armature 402 is fixedly arranged on the lifting shaft 401. The outer side of the armature 402 is provided with a gate opening yoke 406, a gate opening coil 405, a permanent magnet 403, a closing coil 404 and a closing yoke 407 from top to bottom. The lower end of the lifting shaft 401 is fixedly connected to the upper end of the main shaft body 108, and as shown Figure 1As shown, the lower end of the main shaft body 108 is connected to the vacuum arc chamber 3, and a moving contact and a static contact are provided in the vacuum arc chamber 3. When the moving contact descends and contacts the static contact, electrical connection is achieved. When the moving contact rises and separates from the static contact, electrical disconnection is achieved. This is a well-known technology in the art. For example, refer to the vacuum arc chamber structure in the CN219553512U patent. The lower end of the main shaft body 108 is connected to the moving contact in the vacuum arc chamber 3.

[0025] like Figures 2-3 As shown, in this embodiment, two spring retaining rings 103 are sleeved on the middle part of the main shaft body 108, and the two spring retaining rings 103 are respectively arranged on the upper and lower sides of the limit platform 109, the upper end of the upper energy storage spring 102 is against the upper limit retaining ring 101, and the lower end is against the spring retaining ring 103 on the corresponding side, the upper end of the lower energy storage spring 104 is against the spring retaining ring 103 on the corresponding side, and the lower end is against the lower limit retaining ring 105.

[0026] like Figures 2-3 As shown, in this embodiment, the upper limit retaining ring 101 is fixedly mounted on the main shaft body 108 via an upper pin shaft 1011 , and the lower limit retaining ring 105 is fixedly mounted on the main shaft body 108 via a lower pin shaft 1051 .

[0027] like Figures 2-3 As shown, in this embodiment, a threaded section is provided at the upper end of the main shaft body 108 and is threadedly fixedly connected to the lower end of the lifting shaft 401 .

[0028] like Figures 2-3 As shown, in this embodiment, an overtravel adjustment rod 107 and an overtravel spring 106 are provided at the lower end of the main shaft body 108, wherein the overtravel spring 106 is arranged between the lower limit retaining ring 105 and the upper end of the overtravel adjustment rod 107, and the lower end of the overtravel adjustment rod 107 is provided with a threaded section which is threadedly fixedly connected to the upper end rod of the moving contact in the vacuum arc extinguishing chamber 3.

[0029] like Figures 2-3 As shown, in this embodiment, a long installation hole is provided at the lower end of the main shaft body 108, and the overtravel adjustment rod 107 is installed on the main shaft body 108 through an adjustment rod pin shaft 1071, and the adjustment rod pin shaft 1071 passes through the long installation hole.

[0030] The working principle of the utility model is:

[0031] When the utility model only relies on the permanent magnet mechanism 4 for automatic operation, when the vacuum interrupter 3 is closed, the closing coil 404 is energized, and the direction of the electromagnetic field generated by the current is opposite to that of the closing yoke 407. At this time, the armature 402 is driven to drive the lifting shaft 401 to move downward. The closing coil 404 is energized for a short set time, as long as the lifting shaft 401 can be ensured to be in place, and then the power is cut off. After the power is cut off, the armature 402 is kept in place by the magnetic force of the permanent magnet 403, and the lifting shaft 401 moves downward, and the moving contact on the upper side of the vacuum interrupter 3 is driven downward by the main shaft body 108 to contact the vacuum interrupter 3. The static contact on the lower side of the arc chamber 3 is in contact to achieve electrical connection. When the vacuum arc chamber 3 is opened, the opening coil 405 is energized to generate magnetic force, and the direction of the electromagnetic field generated by the current is opposite to that of the opening yoke 406. At this time, the armature 402 is driven to drive the lifting shaft 401 to move upward. Similarly, the opening coil 405 is only energized for a short time, and then the power is cut off. After the lifting shaft 401 rises to its position, the armature 402 is held in position by the magnetic force of the permanent magnet 403, and the lifting shaft 401 moves upward to drive the moving contact on the upper side of the vacuum arc chamber 3 to separate from the static contact on the lower side through the main shaft body 108 to disconnect the electrical connection. The permanent magnet mechanism 4 is a well-known technology in the art, for example, the bistable permanent magnet mechanism in the CN117650026 B patent can be used.

[0032] and Figures 2-3As shown, the utility model can also realize manual operation by adding structures such as the opening and closing handle 2 and the opening and closing drive shaft 1. When the lifting shaft 401 in the permanent magnet mechanism 4 is in the opening position and its coil cannot be automatically operated or other situations that require manual operation due to power failure or other reasons, the operator uses the insulating rod to pull down the opening and closing handle 2, and the opening and closing handle 2 drives the opening and closing pin shaft 203 to move downward through the handle connecting rod 201 and the shift fork 202. The downward movement of the opening and closing pin shaft 203 drives the limit platform 109 to move downward to compress the lower energy storage spring 104 to store energy. When the opening and closing pin shaft 203 abuts against the lower end of the limit long hole 1081, the lower energy storage spring 104 After the energy storage is completed, the opening and closing handle 2 continues to be pulled down. At this time, the main shaft body 108 is driven to move downward to close the vacuum arc chamber 3, wherein the lower end of the main shaft body 108 drives the moving contact in the vacuum arc chamber 3 to move downward and contact with the static contact, and the upper end of the main shaft body 108 drives the lifting shaft 401 and the armature 402 in the permanent magnet mechanism 4 to move downward to the closing position. In this way, when the operator releases the opening and closing handle 2, the lifting shaft 401 together with the main shaft body 108 on the lower side can still maintain the closing position under the magnetic force of the permanent magnet 403. At the same time, the limit platform 109 drives the opening and closing pin shaft 203 to rise and return to its original position under the drive of the lower energy storage spring 104, thereby driving the opening and closing handle 2 to return to its original position. The manual opening process is the opposite of the above. When the lifting shaft 401 in the permanent magnet mechanism 4 is in the closing position and the coil cannot be automatically operated due to power failure or other reasons, the operator uses the insulating rod to push up the opening and closing handle 2, thereby moving the opening and closing pin shaft 203 upward to drive the limit platform 109 to compress the upper energy storage spring 102. When the opening and closing pin shaft 203 is against the uppermost end of the limit long hole 1081, continuing to push up the opening and closing handle 2 will drive the main shaft body 108 to move upward. At this time, the main shaft body 108 drives the moving contact in the vacuum arc chamber 3 at the lower end to move up and separate from the static contact to achieve opening. At the same time, the main shaft body 108 drives the upper lifting shaft 401 to drive the armature 402 to rise to the opening position. In this way, after releasing the opening and closing handle 2, the lifting shaft 401 together with the main shaft body 108 on the lower side can be kept in the opening position by the magnetic force of the permanent magnet 403, and the opening and closing handle 2 is driven to return to its original position by the upper energy storage spring 102.

[0033] In addition, Figures 2-3As shown, a floating overtravel adjustment rod 107 and an overtravel spring 106 are provided at the lower end of the main shaft body 108. The overtravel adjustment rod 107 and the overtravel spring 106 are used to ensure the lifting range of the main shaft body 108, so that it can not only ensure that the moving contact at the lower end is in contact or separation with the static contact, but also ensure that the lifting shaft 401 at the upper end together with the armature 402 can move to the opening or closing position in the permanent magnet mechanism 4, thereby not affecting the subsequent automatic control of the permanent magnet mechanism 3. The adjustment rod pin 1071 at the upper end of the overtravel adjustment rod 107 can float within a certain range along the mounting long hole at the lower end of the main shaft body 108, and at the same time, the lower limit retaining ring 105 cooperates with the compression overtravel spring 106 to ensure that the main shaft body 108 can be reset to the set position.

[0034] like Figure 5 As shown, an application example of the utility model is a new type of outdoor pole-mounted switch, wherein the vacuum arc chamber 3 is arranged in the vacuum arc chamber cavity 5 on the switch, and the opening and closing drive shaft 1, the permanent magnet mechanism 4, etc. are concentrated in the opening and closing mechanism cavity at the upper end of the switch, the opening and closing handle 2 is arranged on the outer side of the upper end of the switch, and the other end of the handle connecting rod 201 passes through the upper end of the switch and is connected to an indicator needle 204 to cooperate with the state of the opening and closing marking indicating device on the switch.

Claims

1. A switch-on and switch-off mechanism for a vacuum interrupter, characterized in that: The invention comprises a switch-on / off drive shaft (1) and a switch-on / off handle (2), wherein the switch-on / off drive shaft (1) comprises a main shaft body (108) and an upper limit retaining ring (101), an upper energy storage spring (102), a limit platform (109), a lower energy storage spring (104) and a lower limit retaining ring (105) which are sequentially sleeved on the main shaft body (108) from top to bottom, and a position of the limit platform (109) is provided on the main shaft body (108). A limiting long hole (1081) is provided, a closing and opening pin shaft (203) is provided on the closing and opening handle (2), the limiting platform (109) is driven to rise and fall by the closing and opening pin shaft (203), and the closing and opening pin shaft (203) passes through the limiting long hole (1081), the upper end of the main shaft body (108) is connected to the permanent magnet mechanism (4), and the lower end of the main shaft body (108) is connected to the moving contact in the vacuum interrupter (3); A handle connecting rod (201) is provided on one side of the opening and closing handle (2), and a shift fork (202) is provided on the handle connecting rod (201), and the opening and closing pin shaft (203) is provided on the shift fork (202); The permanent magnet mechanism (4) comprises a lifting shaft (401), and an armature (402) is provided on the lifting shaft (401), and an opening yoke (406), an opening coil (405), a permanent magnet (403), a closing coil (404) and a closing yoke (407) are provided on the outer side of the armature (402) in order from top to bottom, and the lower end of the lifting shaft (401) is fixedly connected to the upper end of the main shaft body (108); Two spring retaining rings (103) are sleeved on the middle part of the main shaft body (108), and the two spring retaining rings (103) are respectively arranged on the upper and lower sides of the limiting platform (109); The upper limit stop ring (101) is fixedly mounted on the main shaft body (108) via an upper pin shaft (1011), and the lower limit stop ring (105) is fixedly mounted on the main shaft body (108) via a lower pin shaft (1051); The upper end of the main shaft body (108) is provided with a threaded section which is threadedly fixedly connected to the lower end of the lifting shaft (401); An overtravel adjustment rod (107) and an overtravel spring (106) are provided at the lower end of the main shaft body (108), wherein the overtravel spring (106) is provided between the lower limit retaining ring (105) and the upper end of the overtravel adjustment rod (107), and the lower end of the overtravel adjustment rod (107) is connected to the moving contact in the vacuum interrupter (3); The lower end of the main shaft body (108) is provided with a mounting long hole, the overtravel adjustment rod (107) is installed on the main shaft body (108) through an adjustment rod pin shaft (1071), and the adjustment rod pin shaft (1071) passes through the mounting long hole.

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