Pneumatic isolation change-over switch with self-locking function

Abstract

The utility model provides a pneumatic isolation change-over switch with a self-locking function, and the change-over switch comprises a supporting seat which is installed in a synthesis test voltage loop through an insulating assembly; the switch body comprises a shaft sleeve, a rotating arm and a cutter bar; the shaft sleeve is rotationally arranged on the supporting seat; one end of the rotating arm and one end of the cutter bar are oppositely arranged on the shaft sleeve; the pneumatic assembly is rotationally arranged on the supporting base, the telescopic end of the pneumatic assembly is rotationally and movably connected with the other end of the rotating arm through a first connecting block, and the pneumatic assembly is used for driving the shaft sleeve to drive the cutter bar to rotate so that the free end of the cutter bar can drive a moving contact in the contact system to make contact with or be separated from a static contact in the contact system; the control device is electrically connected with the pneumatic assembly and used for controlling starting or stopping of the pneumatic assembly. The operation efficiency and safety of the pneumatic isolation change-over switch are improved.

Description

Technical Field

[0001] This application relates to the field of power equipment technology, and in particular to a pneumatic disconnect switch with a self-locking function. Background Technology

[0002] In high-voltage power testing, the synthesized test circuit needs to frequently switch voltage levels or operating modes. Using traditional manual or electric switches suffers from slow response, large size, and low reliability. This is especially true for tests at 220kV and above, requiring a disconnecting transfer switch that combines fast response, high insulation, and self-locking stability. However, traditional disconnecting transfer switches have the following problems:

[0003] 1) Inconvenient to operate: Manually operating the isolating changeover switch requires a lot of manpower and is slow to operate;

[0004] 2) Insufficient insulation performance: In high humidity or polluted environments, the insulation performance of the isolating transfer switch may decrease, leading to safety hazards;

[0005] 3) Short mechanical life: Frequent operation may cause wear and tear on the mechanical parts of the isolating changeover switch, affecting its service life.

[0006] Based on this, this application proposes a pneumatic isolation changeover switch with a self-locking function. Utility Model Content

[0007] This application provides a pneumatic isolation changeover switch with a self-locking function to solve the technical problems described in the background art above.

[0008] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0009] This application provides a pneumatic disconnect switch with a self-locking function, comprising:

[0010] The support base is installed in the synthetic test voltage circuit via an insulating assembly;

[0011] A switch body, comprising a bushing, a rotating arm, and a tool bar; the bushing is rotatably mounted on the support base, and one end of the rotating arm and one end of the tool bar are both mounted opposite to the bushing.

[0012] A pneumatic assembly is rotatably mounted on the support base, and its telescopic end is movably connected to the other end of the rotating arm via a first connecting block. It is used to drive the bushing to rotate the tool bar so that the free end of the tool bar drives the moving contact in the contact system to contact or separate from the stationary contact in the contact system.

[0013] A control device, electrically connected to the pneumatic assembly, is used to control the start or stop of the pneumatic assembly.

[0014] Optionally, the insulation assembly includes a composite insulator, an upper mounting plate, and a lower mounting plate;

[0015] The upper mounting plate and the lower mounting plate are respectively disposed at the top and bottom of the composite insulator, the lower surface of the support base is disposed on the upper surface of the upper mounting plate, and the lower mounting plate is installed in the composite test voltage circuit.

[0016] Optionally, the support base is provided with a first connecting shaft, and the bushing is sleeved on the first connecting shaft and rotatably connected to the first connecting shaft.

[0017] Optionally, the switch body may further include a pneumatic clamping device;

[0018] The clamping head of the pneumatic clamping device is inverted U-shaped and is electrically connected to the control device, used to control the clamping or releasing of the tool bar by the control device.

[0019] Optionally, the support base is further provided with a second connecting shaft;

[0020] The pneumatic assembly includes a cylinder and a second connecting block;

[0021] One end of the second connecting block is movably connected to the second connecting shaft, and the other end is connected to the cylinder body of the cylinder, which is electrically connected to the control device.

[0022] Optionally, the intake pressure of the cylinder is 0.6~0.8MPa.

[0023] Optionally, the support base, the bushing, the rotating arm, the tool holder, and the first connecting block are all made of Q235 material.

[0024] The pneumatic disconnect switch with self-locking function provided in this application uses a pneumatic component to drive a rotating arm, which in turn rotates a bushing. This rotation causes a knife bar mounted on the bushing to rotate. During rotation, the free end of the knife bar causes the moving contact in the contact system to contact or separate from the stationary contact, thus closing or opening the pneumatic disconnect switch. The pneumatic component is started or stopped via a control device electrically connected to it. This gives the pneumatic disconnect switch a self-locking function and enables remote operation with greater precision. It avoids frequent opening and closing of the disconnect switch, preventing mechanical wear and extending its service life. Furthermore, it allows the pneumatic disconnect switch to meet the needs of smart grids, saving manpower and improving operational efficiency and safety. In addition, the switch body and pneumatic components are all mounted on a support base, which is installed in the synthetic test voltage circuit via an insulating component. This improves the insulation performance of the pneumatic disconnect switch, enhancing its safety and enabling its application in high-humidity or polluted environments. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of a pneumatic isolation switch with self-locking function provided in an embodiment of this application;

[0027] Figure 2 A cross-sectional view of a pneumatic disconnector switch with self-locking function provided in an embodiment of this application in the closed state;

[0028] Figure 3 A top view of a pneumatic disconnect switch with self-locking function provided in an embodiment of this application in the closed state;

[0029] Figure 4 A side view of a pneumatic disconnect switch with self-locking function provided in an embodiment of this application in the open state;

[0030] Figure 5 This is a schematic diagram showing that both the cylinder and the pneumatic clamping device provided in an embodiment of this application are electrically connected to the control device.

[0031] In the diagram: 100, support base; 101, first connecting shaft; 102, second connecting shaft; 200, insulation component; 201, composite insulator; 202, upper mounting plate; 203, lower mounting plate; 300, switch body; 301, bushing; 302, rotating arm; 303, knife bar; 304, pneumatic clamping device; 400, pneumatic component; 401, cylinder; 402, second connecting block; 500, first connecting block; 600, control device. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0033] refer to Figures 1 to 5 This application provides a pneumatic disconnect switch with a self-locking function, comprising:

[0034] The support base 100 is installed in the synthetic test voltage circuit via the insulating component 200. The insulating component 200 not only enhances the insulation performance of the entire pneumatic disconnect switch but also saves the floor space occupied by the entire pneumatic disconnect switch.

[0035] The switch body 300 includes a bushing 301, a rotating arm 302, and a tool holder 303. The bushing 301 is rotatably mounted on the support base 100. One end of the rotating arm 302 and one end of the tool holder 303 are both mounted opposite each other on the bushing 301 (wherein, one end of the rotating arm 302 and one end of the tool holder 303 are both fixedly connected to the bushing 301). Specifically, when the rotating arm 302 rotates clockwise, it drives the bushing 301 to rotate clockwise synchronously, and the tool holder 303 follows the bushing 301 in rotating clockwise (see...). Figures 3 to 4 (See the state diagram). Conversely, when the rotating arm 302 rotates counterclockwise, the rotating arm 302 drives the bushing 301 to rotate counterclockwise synchronously, while the tool holder 303 follows the bushing 301 to rotate counterclockwise (see the state diagram). Figures 4 to 3 (State diagram).

[0036] A pneumatic assembly 400 is rotatably mounted on a support base 100, and its telescopic end is movably connected to the other end of a rotating arm 302 via a first connecting block 500. This assembly drives the bushing 301 to rotate the tool holder 303, causing the free end of the tool holder 303 to contact or separate the moving contact in the contact system from the stationary contact in the contact system. The contact system is the actuator of an electrical appliance, used to connect and disconnect circuits. It typically consists of moving and stationary contacts and can be classified into bridge contacts and finger contacts based on their structural form. The contact system also includes contact springs (which provide pressure between the contacts to ensure good contact performance), arc-extinguishing devices (which extinguish the arc generated when the contacts break. For example, in a high-voltage circuit breaker, the arc-extinguishing chamber extinguishes the arc by magnetic blowout and electrodynamic drive to elongate and cool the arc to deionize it), and other components that also need to consider electrical and thermal stability, as detailed in the prior art. Since the contact system is not an innovation of this application, its structure will not be specifically described here.

[0037] A control device 600 is electrically connected to the pneumatic assembly 400 and is used to control the start or stop of the pneumatic assembly 400. The control device 600 includes a PLC controller, which is electrically connected to the pneumatic assembly 400.

[0038] The pneumatic disconnect switch with self-locking function provided in this application uses a pneumatic component 400 to drive a rotating arm 302 to pull a bushing 301 to rotate, thereby rotating a knife bar 303 mounted on the bushing 301. During the rotation, the free end of the knife bar 303 drives the moving contact in the contact system to contact or separate from the stationary contact in the contact system, thus achieving the closing or opening of the pneumatic disconnect switch. The starting or stopping of the pneumatic component 400 in the above process is achieved by a control device 600 electrically connected to it. This gives the pneumatic disconnect switch a self-locking function and enables remote operation of the pneumatic disconnect switch with more precise operation. It avoids the wear and tear on the mechanical structure caused by frequent opening and closing of the disconnect switch, extends the service life of the disconnect switch, and makes the pneumatic disconnect switch adaptable to the needs of smart grids, thereby saving manpower and improving the operating efficiency and safety of the pneumatic disconnect switch. In addition, the switch body 300 and pneumatic component 400 in this application are both mounted on the support base 100, and the support base 100 is installed in the synthetic test voltage circuit through the insulation component 200, thereby improving the insulation performance of the pneumatic disconnect switch, improving its safety and enabling it to be used in high humidity or polluted environments.

[0039] In some embodiments, reference Figure 1The insulation component 200 in this application includes a composite insulator 201, an upper mounting plate 202, and a lower mounting plate 203. Specifically, the upper mounting plate 202 and the lower mounting plate 203 are respectively disposed at the top and bottom of the composite insulator 201, the lower surface of the support base 100 is disposed on the upper surface of the upper mounting plate 202, and the lower mounting plate 203 is installed in the synthetic test voltage circuit. The composite insulator 201 is a special type of insulation control that plays an important role in overhead transmission lines. The composite insulator 201 can be classified as: line composite insulators and substation / electrical equipment composite insulators, and can also be classified as: rod-type suspension composite insulators, pin-type composite insulators, crossarm composite insulators, post composite insulators, wind-resistant composite insulators, etc. The type of composite insulator 201 used in this application can be set according to actual needs; therefore, this application does not specifically limit it.

[0040] In the above embodiments, the composite insulator 201 improves the insulation performance of the pneumatic disconnect switch, thereby enhancing its safety and enabling its application in high humidity or polluted environments.

[0041] In some embodiments, reference Figures 1 to 4 In this application, a first connecting shaft 101 is provided on the support base 100, and a bushing 301 is sleeved on the first connecting shaft 101 and rotatably connected to the first connecting shaft 101. The first connecting shaft 101 is fixedly connected to the support base 100.

[0042] In the above embodiment, the bushing 301 rotates around the first connecting shaft 101 throughout the entire rotation process (clockwise or counterclockwise), and the bushing 301 can be rotatably connected to the first connecting shaft 101 through a bearing.

[0043] In some embodiments, reference Figure 5 The switch body 300 in this application also includes a pneumatic clamping device 304. Specifically, the clamping head of the pneumatic clamping device 304 is inverted U-shaped and is electrically connected to the control device 600, used to control the clamping or releasing of the tool bar by the control device 600. The housing of the pneumatic clamping device 304 can be fixed on the support frame in the synthetic test voltage circuit. The specific position and connection method depend on its specific structure and application scenario, and this application does not specifically limit it.

[0044] In the above embodiments, the pneumatic clamping device 304 can be a pneumatic finger cylinder of the MHZL2 series, a finger cylinder of the MHC2 series, etc., which can be selected according to the actual situation, and this application does not specifically limit it. In addition, the working principle of the pneumatic clamping device 304 can refer to the working principle of the existing pneumatic finger cylinders of the MHZL2 series, MHC2 finger cylinders, etc., and this application will not elaborate on it here. This application improves the stability of the pneumatic isolating changeover switch during the closing process by setting the pneumatic clamping device 304 so that the knife bar 303 is clamped by it during the closing process. Specifically, after the free end of the knife bar 303 drives the moving contact in the moving contact system to contact the stationary contact in the contact system, that is, after the pneumatic isolating changeover switch in this application is closed, the control device 600 controls the clamping head of the pneumatic clamping device 304 to open and clamp the knife bar 303, thereby achieving the purpose of clamping and fixing the knife bar 303 by the clamping head of the pneumatic clamping device 304.

[0045] In some embodiments, reference Figures 1 to 4 The support base 100 in this application is also provided with a second connecting shaft 102; wherein the second connecting shaft 102 is fixedly connected to the support base 100.

[0046] In addition, the pneumatic assembly 400 includes a cylinder 401 and a second connecting block 402; specifically, one end of the second connecting block 402 is movably connected to the second connecting shaft 102, and the other end is connected to the cylinder body of the cylinder 401, which is electrically connected to the control device 600. The specifications and model of the cylinder 401 can be selected according to actual conditions, and this application does not impose specific limitations on it.

[0047] In the above embodiment, during the extension and retraction of the telescopic end of the cylinder 401, the telescopic end of the cylinder 401 drives the first connecting block 500 fixedly connected to it to extend. Since the first connecting block 500 is movably connected to the rotating arm 302, the rotating arm 302 rotates clockwise as the telescopic end of the cylinder 401 extends, gradually revealing... Figure 4In this state, the free end of the knife bar 303 will rotate clockwise with the bushing 301, causing the moving contact in the contact system to separate from the stationary contact in the contact system, thereby realizing the opening of the pneumatic disconnecting changeover switch. It should be noted that the support base 100 has a notch below the first connecting shaft 101 so that the clockwise rotation of the knife bar 303 will not be blocked. Conversely, during the retraction of the extension end of the cylinder 401, the cylinder 401 pulls the rotating arm 302 back towards the second connecting block 402, and the rotating arm 302 rotates counterclockwise, and the bushing 301 rotates counterclockwise with the rotating arm 302, thereby driving the knife bar 303 to rotate counterclockwise until the free end of the knife bar 303 causes the moving contact in the contact system to contact the stationary contact in the contact system, thereby realizing the closing of the pneumatic disconnecting changeover switch.

[0048] In some embodiments, the intake pressure of cylinder 401 in this application is 0.6~0.8MPa.

[0049] In the above embodiments, a low intake pressure of cylinder 401 may result in a small output force, leading to poor stability during operation. Conversely, an excessively high intake pressure may increase compressed air consumption and potentially accelerate wear on internal components. Therefore, the intake pressure of cylinder 401 needs to be within a suitable range. An intake pressure of 0.6~0.8 MPa not only ensures stable operation of cylinder 401 but also improves its operating efficiency, reducing energy consumption and wear.

[0050] In some embodiments, the support base 100, bushing 301, rotating arm 302, tool holder 303 and first connecting block 500 in this application are all made of Q235 material.

[0051] In the above embodiments, Q235 is a common carbon structural steel with good plasticity, toughness, and weldability, while also possessing moderate strength, which can meet the needs of most engineering structures. Therefore, this application uses structural components such as the support base 100, bushing 301, rotating arm 302, tool holder 303, and first connecting block 500 made of Q235 material, resulting in lower processing costs and better mechanical properties for the entire pneumatic disconnect switch.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A pneumatic disconnect switch with a self-locking function, characterized in that, include: A support base (100) is mounted in the synthetic test voltage circuit via an insulating assembly (200); The switch body (300) includes a bushing (301), a rotating arm (302), and a tool bar (303); the bushing (301) is rotatably mounted on the support base (100), and one end of the rotating arm (302) and one end of the tool bar (303) are both mounted opposite each other on the bushing (301); A pneumatic assembly (400) is rotatably mounted on the support base (100), and its telescopic end is movably connected to the other end of the rotating arm (302) through a first connecting block (500). It is used to drive the bushing (301) to rotate the tool bar (303) so that the free end of the tool bar (303) drives the moving contact in the contact system to contact or separate from the stationary contact in the contact system. A control device (600) is electrically connected to the pneumatic assembly (400) and is used to control the start or stop of the pneumatic assembly (400).

2. The pneumatic isolation changeover switch with self-locking function according to claim 1, characterized in that, The insulation assembly (200) includes a composite insulator (201), an upper mounting plate (202), and a lower mounting plate (203). The upper mounting plate (202) and the lower mounting plate (203) are respectively disposed at the top and bottom of the composite insulator (201), the lower surface of the support base (100) is disposed on the upper surface of the upper mounting plate (202), and the lower mounting plate (203) is installed in the composite test voltage circuit.

3. The pneumatic isolation changeover switch with self-locking function according to claim 1, characterized in that, The support base (100) is provided with a first connecting shaft (101), and the bushing (301) is sleeved on the first connecting shaft (101) and rotatably connected to the first connecting shaft (101).

4. The pneumatic isolation changeover switch with self-locking function according to claim 1, characterized in that, The switch body (300) also includes a pneumatic clamping device (304); The clamping head of the pneumatic clamping device (304) is inverted U-shaped and is electrically connected to the control device (600) for controlling the clamping or releasing of the tool bar (303) by the control device (600).

5. The pneumatic isolation changeover switch with self-locking function according to claim 1, characterized in that, The support base (100) is also provided with a second connecting shaft (102); The pneumatic assembly (400) includes a cylinder (401) and a second connecting block (402); One end of the second connecting block (402) is movably connected to the second connecting shaft (102), and the other end is connected to the cylinder body of the cylinder (401), which is electrically connected to the control device (600).

6. The pneumatic isolation changeover switch with self-locking function according to claim 5, characterized in that, The intake pressure of the cylinder (401) is 0.6~0.8MPa.

7. The pneumatic isolation changeover switch with self-locking function according to any one of claims 1 to 5, characterized in that, The support base (100), the bushing (301), the rotating arm (302), the tool holder (303), and the first connecting block (500) are all made of Q235 material.

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