Indoor high-voltage grounding switch

Abstract

The invention discloses an indoor high-voltage grounding switch, which comprises a vacuum box body, a lock rod, a power connection seat and an electromagnetic driving assembly, and is characterized in that one side of the vacuum box body is connected with a sealing cover box, and the sealing cover box is internally provided with a guide rod and a detonation protection mechanism; the electromagnetic driving assembly slides along the guide rod and drives the lock rod to move, and the lock rod is connected with the access electrode through the first insulating terminal; the power connection seat comprises a shaft frame, a movable guide frame, a threaded sleeve ring and a rotating seat, the threaded sleeve ring is in threaded connection with the lock rod, and a second insulating terminal and a grounding electrode are arranged on the rotating seat to realize circuit grounding. The detonating protection mechanism comprises a fixed cylinder, a plunger rod, a short-circuit control electrode and a detonating explosive, and triggers an explosion to push the lock rod to be grounded forcibly in an abnormal state. The device has a dual-trigger control mode, can be driven by an electromagnetic assembly in a conventional state, realizes emergency grounding through explosion gas in an abnormal state, and is quick in response; meanwhile, the contact stability is enhanced through a thread locking structure, and the system safety and reliability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of earthing switches, and particularly to an indoor high-voltage earthing switch. Background Art

[0002] In the existing power system, as a key safety protection device in the power transmission and distribution network, the high-voltage earthing switch is mainly used to provide an effective earthing path during equipment maintenance or fault conditions, preventing residual charges or over-voltages from damaging equipment and personnel. The traditional structure of a high-voltage earthing switch usually includes: a manual or electric mechanical driving mechanism, a single control mode (such as motor drive or pneumatic drive), a unidirectional action mechanism (only supporting normal closing or opening), and a simple contact structure such as a sliding or spring snap-type electrode connection.

[0003] In the traditional structure, electromagnetic drive is often used to control the movement of the locking rod or contact components, but relying solely on a single power supply for control, once the control system fails or encounters strong external interference, earthing failure may occur. In addition, some products use a mechanical spring energy storage method for action switching. Its response speed is limited by the elastic structure, and the performance of the spring is prone to attenuation after long-term use, and it cannot ensure reliable operation in extreme conditions. Furthermore, the traditional contact parts mostly adopt a flat docking or pressing structure, lacking self-locking ability, and are easily affected by external factors such as vibration and electromagnetic disturbance, resulting in electrode loosening. In severe cases, it may cause incomplete earthing or excessive contact resistance.

[0004] In view of this, in order to research and improve the existing problems, an indoor high-voltage earthing switch is provided to solve the current problems, aiming to achieve the purpose of solving problems and improving practical value through this technology. Summary of the Invention

[0005] The present invention provides an indoor high-voltage earthing switch applicable to a high-voltage power transmission and distribution system, which has a dual triggering mechanism of electromagnetic drive and explosive pneumatic drive, and has the advantages of rapid response, reliable earthing, and flexible control. Especially in abnormal or fault conditions, it can still ensure the earthing safety of equipment and personnel.

[0006] The present invention provides an indoor high-voltage earthing switch, including: a vacuum box body, a locking rod, a power connection seat, and an electromagnetic drive assembly; One side of the vacuum box body is fixedly connected with a sealed cover box. Inside the sealed cover box, there is a guide rod for guiding the sliding of the electromagnetic drive assembly. Inside the sealed cover box, an initiation protection mechanism is fixedly installed. The initiation protection mechanism is used to push the electromagnetic drive assembly to move linearly along the surface of the guide rod during the operation of the contact control circuit; One end of the locking rod is provided with a first insulating terminal fixed on the surface of the electromagnetic drive assembly, and an access electrode electrically connected to the locking rod is provided on the surface of the first insulating terminal; The electromagnetic drive assembly includes a disk base, an excitation disk, and a plurality of magnetic blocks fixed to the inner side of the disk base. The excitation disk is arranged on both sides of the magnetic blocks, and excitation coils facing the surfaces of the magnetic blocks are provided on the surface of the excitation disk; The power connection base includes a shaft frame, a moving guide frame, a screw sleeve ring, and a rotating base. A slide rod is provided on one side of the moving guide frame and penetrates through the surface of the vacuum box body for guiding the sliding of the moving guide frame. A spring connecting to the inner wall of the vacuum box body is provided on one side of the moving guide frame. The screw sleeve ring is slidably installed on one side of the rotating base, and a second insulating terminal is provided on the other side of the rotating base and connected to a grounding electrode. Moving and fixed gear disks that abut against each other are provided on the opposite surfaces of the screw sleeve ring and the moving guide frame. The internal screw hole of the screw sleeve ring is adapted to the thread on the surface of the locking rod. This structure realizes the linear sliding action of the high-voltage grounding switch through the cooperation of electromagnetic drive and screw propulsion, ensuring both the smoothness of movement and the structural tightness, and effectively improving the reliability of contact conduction.

[0007] In a preferred example of the present invention, it can be further configured that: the detonation protection mechanism includes a fixed cylinder, a plunger rod, and a short-circuit control electrode fixed to the surface of the fixed cylinder. The end of the short-circuit control electrode is connected to a detonating charge located inside the fixed cylinder. One end of the plunger rod is slidably sleeved inside the fixed cylinder. The fixed cylinder is fixed inside the sealed cover box, and one end of the plunger rod is arranged opposite to the electromagnetic drive assembly. Through this structure, when the electronic control fails or a short circuit occurs, the plunger rod can be quickly driven to act through explosive driving, ensuring that emergency grounding does not rely on power and enhancing the anti-failure ability of the system.

[0008] In a preferred example of the present invention, it can be further configured that: the end of the short-circuit control electrode is used to connect to a control circuit, and the detonating charge is ignited under the trigger of a short-circuit signal. The detonating charge is a sodium azide granule structure. After being ignited, a large amount of gas is generated, pushing the plunger rod, the electromagnetic drive assembly, and the locking rod to move linearly synchronously. Utilizing the instantaneous release of high-energy gas to achieve mechanical action, the response speed is fast, and the grounding operation can be completed within an extremely short time, avoiding secondary electrical damage caused by delay.

[0009] In a preferred example of the present invention, it can be further configured that: wing plates slidably sleeved on the surface of the guide rod are provided on the surface of the excitation disk. The input end of the excitation disk is connected to a controller for passing alternating current through the excitation coils according to instructions. The sliding sleeve connection method is used in cooperation with the guide rod to ensure good linear guiding performance while having rotational movement, making the engagement process more stable and reliable.

[0010] In a preferred example of the present invention, it can be further configured that: the spring is a tension spring structure, and its two ends are respectively connected to the inner wall of the vacuum box body and the moving guide frame and are in a stretched state. The moving and fixed gear disks are ratchet structures for inhibiting the free rotation of the screw sleeve ring. The spring structure provides a stable restoring force, and the ratchet design prevents the screw sleeve ring from loosening due to vibration or disturbance during contact, improving the overall connection stability.

[0011] In a preferred embodiment, the present invention can be further configured such that: a sliding pin is provided on one side of the transposition for guiding the nut ring to linearly slide along its surface. The design of the sliding pin enables the nut ring to be stably propelled along a specified trajectory, ensuring the smoothness of the threaded engagement with the locking rod and enhancing the mechanical coordination of the grounding operation.

[0012] In a preferred embodiment, the present invention can be further configured such that: the access electrode and the grounding electrode end portions respectively penetrate through the sealing cover box and the vacuum box body for connecting the control circuit and the grounding system. This design enables the efficient introduction or extraction of high-voltage current from the external circuit, simplifies the overall wiring structure, and is conducive to the unified maintenance of external interfaces.

[0013] In a preferred embodiment, the present invention can be further configured such that: the vacuum box body and the sealing cover box are made of transparent acrylic members, and the inside thereof is in a state of low air pressure or vacuum. The combined effect of vacuum and transparency can effectively inhibit the generation of electric arcs, enhance the insulation strength, and at the same time facilitate non-invasive visual inspection and status monitoring.

[0014] The beneficial effects achieved by the present invention are as follows: 1. In the present invention, two control modes of electromagnetic drive trigger and initiation protection mechanism trigger are provided. Among them, the electromagnetic trigger is used for automatic operation in the normal control system state and is suitable for daily on-off switch occasions; the initiation trigger mechanism is used for emergency grounding response in abnormal states (such as short circuit, high temperature, etc.). Through the dual trigger mechanism, even in extreme cases where the control system fails or cannot normally send electrical signals, it is still possible to rely on the explosive gas drive to achieve emergency grounding, significantly enhancing the safety redundancy and operation reliability of the equipment, and being applicable to power system environments with high safety level requirements.

[0015] 2. In the present invention, the provided initiation protection mechanism triggers the initiator through the short-circuit control electrode, releases high-pressure gas to push the plunger rod to act instantaneously, and can drive the locking rod to complete linear contact in a short time to achieve rapid grounding. Compared with the traditional methods that rely on mechanical spring energy storage release or complex electric control execution structures, the response speed is greatly improved, effectively reducing the safety risks such as breakdown and flashover caused by grounding delay in the high-voltage system, ensuring that the current can be quickly discharged to the ground at the moment of fault occurrence, and enhancing the overall fault resistance ability of the system.

[0016] 3. In the present invention, the threaded engagement structure between the nut ring and the locking rod enables the locking rod to be accurately axially positioned along the guide (guide rod) during the rotation and propulsion process, and automatically forms a structural fastening after contacting the grounding electrode. This structure not only enhances the contact pressure between the end of the locking rod and the surface of the grounding electrode, ensuring the effective conduction of the grounding current; at the same time, it also avoids the occurrence of contact loosening or instability under external vibration, electromagnetic interference or short-term reaction forces, greatly improving the structural stability and electrical connection reliability in the engaged state. Brief Description of the Drawings

[0017] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 Schematic diagram of the lock rod and the power connection base structure of an embodiment of the present invention; Figure 3 Schematic diagram of the detonation protection mechanism structure of an embodiment of the present invention; Figure 4 Schematic diagram of the electromagnetic drive assembly and the power connection base structure of an embodiment of the present invention; Figure 5 Schematic diagram of the exploded structure of the power connection base of an embodiment of the present invention; Figure 6 Schematic diagram of the sleeve ring and the rotating base structure of an embodiment of the present invention; Figure 7 Schematic diagram of the exploded structure of the electromagnetic drive assembly of an embodiment of the present invention.

[0018] Reference Signs: 100, vacuum box body; 110, sealing cover box; 120, detonation protection mechanism; 111, guide rod; 121, fixed cylinder; 122, plunger rod; 123, short - circuit control electrode; 124, primary explosive; 200, lock rod; 210, first insulating terminal; 220, access electrode; 300, power connection base; 310, shaft bracket; 320, moving guide frame; 330, sleeve ring; 340, rotating base; 321, spring; 322, fixed tooth disk; 331, moving tooth disk; 341, second insulating terminal; 342, grounding electrode; 400, electromagnetic drive assembly; 410, disk base; 420, excitation disk; 430, magnetic block. Detailed Embodiments

[0019] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0020] It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention.

[0021] The following combines the attached Figures 1-7 Describe an indoor high - voltage earthing switch provided by some embodiments of the present invention. Embodiment 1:

[0022] This embodiment provides an indoor high - voltage earthing switch, including: Vacuum box body 100: It is an outer shell component used to provide overall mechanical support and electrical insulation protection. It is made of transparent acrylic material and forms a vacuum environment by evacuating or filling with inert gas to enhance the overall insulation performance of the equipment.

[0023] Sealing cover box 110: It is fixedly connected to one end of the vacuum box body 100 and also has a closed structure made of transparent acrylic material to form a highly airtight cavity. Guide rods 111 are installed on its inner wall to guide the sliding part to move axially. Guide rod 111: It runs through the inside of the sealing cover box 110 and is the track for the electromagnetic drive component 400 to slide, used to ensure its smooth guiding.

[0024] Detonation protection mechanism 120: It includes a fixed cylinder 121, a plunger rod 122, a short - circuit control electrode 123 and a detonating charge 124. The detonating charge 124 is preferably in the form of sodium azide pellets and is fixed at the end of the inner cavity of the fixed cylinder 121. The plunger rod 122 can slide axially inside the fixed cylinder 121, with one end facing the electromagnetic drive component 400, used to push the latter and the locking rod 200 to move forward as a whole in the detonation state. The short - circuit control electrode 123 is arranged between the fixed cylinder 121 and the control circuit, and detonates the detonating charge 124 when triggered by abnormal signals such as a short - circuit.

[0025] Electromagnetic drive component 400: It includes a disk base 410, an excitation disk 420 and multiple magnetic blocks 430. The excitation disk 420 is set at the central position of the disk base 410, and the magnetic blocks 430 are arranged around it to form a stable magnetic field action area. The surface of the excitation disk 420 is provided with an excitation coil, and its input end is connected to an external controller through a wing plate and a conductive slide rail to realize on - off control of command response. The excitation disk 420 is slidably sleeved on the guide rod 111 and drives the whole electromagnetic component to move axially along the guide rod 111 under electromagnetic drive.

[0026] Locking rod 200: One end is connected to the electromagnetic drive component 400 through a first insulating terminal 210 to maintain electrical insulation; an access electrode 220 is set on the surface of the first insulating terminal 210, used to contact with the grounding electrode 342 subsequently to form a circuit closure; the outer wall of the locking rod 200 is provided with threads and is threadedly engaged with the screw sleeve ring 330 in the power connection base 300.

[0027] Power connection base 300: It includes a shaft bracket 310, a movable guide bracket 320, a screw sleeve ring 330, and a swivel base 340. One end of the movable guide bracket 320 is connected to a tension spring 321, and the other end passes through the vacuum box body 100 to form a guiding sliding structure, maintaining the reset performance; the screw sleeve ring 330 is provided with an internal screw hole, which matches the external thread of the locking rod 200; between the screw sleeve ring 330 and the swivel base 340, a mating movable gear disk 331 and fixed gear disk 332 (Note: mislabeled as 322 in the claims, which has been uniformly corrected to 332) are provided to form a ratchet structure for restricting the free rotation of the screw sleeve ring; a second insulating terminal 341 is installed on the outer side of the swivel base 340, which is electrically connected to the grounding electrode 342; a sliding pin is provided on one side of the swivel base 340 for guiding the linear sliding of the screw sleeve ring 330.

[0028] Access to the grounding interface: The end parts of the access electrode 220 and the grounding electrode 342 respectively penetrate through the sealing cover box 110 and the outer wall of the vacuum box body 100 for connection to an external control circuit and a grounding circuit. Embodiment Two:

[0029] Based on Embodiment One, this embodiment further optimizes the protection response structure to adapt to the grounding requirements of different types of electrical equipment.

[0030] In this high-voltage grounding switch, the vacuum box body 100 and the sealing cover box 110 still adopt transparent acrylic materials and are encapsulated by epoxy glue to form a highly airtight structure. The guide rod 111 in the sealing cover box 110 can adopt a double-rail structure to improve the smooth operation of the locking rod 200 and the electromagnetic drive assembly 400.

[0031] In terms of the structure of the electromagnetic drive assembly 400, a flexible conductive brush connector is arranged on the outer ring of the excitation disk 420 to ensure that it remains electrically connected to the external controller during rotation, improving the drive efficiency.

[0032] In terms of the structure of the power connection seat 300, a limit gasket is added between the movable guide bracket 320 and the spring 321 to ensure avoiding tensile fatigue during long-term high-frequency switching operations; an axial anti-slip structure is added between the screw sleeve ring 330 and the swivel base 340 to prevent misoperation due to vibration in special environments.

[0033] This embodiment further enhances the stability and response efficiency of the system, and is particularly suitable for scenarios with higher requirements for the switching action accuracy and response time, such as precision power distribution rooms, power conversion stations, etc.

[0034] Through the description of the above two embodiments, it can be seen that the indoor high-voltage grounding switch proposed by the present invention has the advantages of novel structure, rapid response, and having both electric and explosive double-trigger mechanisms, etc., which can effectively improve the grounding safety under abnormal conditions of the high-voltage system and has good prospects for popularization and application.

[0035] The working principle and usage process of the present invention: Normal operating state: Under the control of the engagement circuit, the electromagnetic drive assembly 400 receives an instruction signal, the excitation disk 420 is energized, and a magnetic field is generated. The excitation disk 420 drives the disk base 410 and the locking rod 200 to rotate, and then through the threaded interaction between the locking rod 200 and the swivel base 340, guides the locking rod 200 and the electromagnetic drive assembly 400 to slide synchronously along the surface of the guide rod 111. During the sliding process, the locking rod 200 gradually approaches the power connection base 300, and its end contacts the grounding electrode 342 inside the swivel base 340, forming an electrode connection. When the end of the locking rod 200 contacts the grounding electrode 342, the access electrode 220 is electrically connected to the grounding electrode 342, and the current is successfully introduced into the grounding circuit, completing the high-voltage grounding.

[0036] Disconnected circuit state: When the control system issues a disconnection instruction, the electromagnetic drive assembly 400 drives the locking rod 200 in the reverse direction, separating it from the swivel base 340 and the sleeve ring 330. During this process, the magnetic block 430 and the disk base 410 rotate in the reverse direction synchronously with the locking rod 200, and the locking rod 200 and the electromagnetic drive assembly 400 slide in the reverse direction synchronously along the surface of the guide rod 111, disengaging from the contact with the grounding electrode 342, resulting in the end of the locking rod 200 being disconnected from the grounding electrode 342. At this time, the current connection between the access electrode 220 and the grounding electrode 342 is disconnected, completing the disconnection operation of the high-voltage grounding switch.

[0037] Abnormal states such as short circuit and high temperature: In the event of abnormal states such as short circuit or high temperature, the control system issues a signal to trigger the short-circuit control electrode 123 to ignite the primer 124. The primer 124 is a sodium azide granule structure. When triggered by the signal, the primer rapidly generates a large amount of gas, pushing the plunger rod 122 to move. The plunger rod 122 pushes the locking rod 200 to move linearly, causing it to interact with the sleeve ring 330, resulting in the free rotation of the sleeve ring 330. Through the threaded action, the locking rod 200 gradually enters the inside of the sleeve ring 330 and the swivel base 340, and the linear movement of the locking rod 200 contacts the end of the grounding electrode 342, completing the grounding connection of the current and ensuring the grounding safety of the equipment.

[0038] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0039] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An indoor high voltage grounding switch, characterized in that: include: A vacuum box body (100), a locking rod (200), an electric socket (300) and an electromagnetic drive assembly (400), A sealing cover box (110) is fixedly connected to one side of the vacuum box body (100); a guide rod (111) for guiding the electromagnetic drive assembly (400) to slide is provided on the inner side of the sealing cover box (110); a detonation protection mechanism (120) is fixedly installed on the inner side of the sealing cover box (110); the detonation protection mechanism (120) is used to push the electromagnetic drive assembly (400) to move linearly along the surface of the guide rod (111) during operation of the contact control circuit; One end of the locking rod (200) is provided with a first insulating terminal (210) fixed to the surface of the electromagnetic drive assembly (400), and the surface of the first insulating terminal (210) is provided with an access electrode (220) electrically connected to the locking rod (200). The electromagnetic drive assembly (400) comprises a disk seat (410), an excitation disk (420), and a plurality of magnetic blocks (430) fixed to the inner side of the disk seat (410); the excitation disk (420) is arranged on both sides of the magnetic block (430), and an excitation coil facing the surface of the magnetic block (430) is provided on the surface of the excitation disk (420); The power receiving seat (300) comprises a shaft frame (310), a movable guide frame (320), a screw collar (330) and a rotating seat (340); a sliding rod is provided on one side of the movable guide frame (320) and penetrates the surface of the vacuum box body (100) and is arranged to guide the sliding of the movable guide frame (320); a spring (321) connected to the inner wall of the vacuum box body (100) is provided on one side of the movable guide frame (320); the screw collar (330) is slidably mounted on one side of the rotating seat (340); a second insulating terminal (341) and a grounding electrode (342) are provided on the other side of the rotating seat (340); a movable toothed disc (331) and a fixed toothed disc (332) abutting against each other are provided on the opposite surfaces of the screw collar (330) and the movable guide frame (320); and a screw hole inside the screw collar (330) is adapted to a thread on the surface of a locking rod (200).

2. An indoor high-voltage grounding switch according to claim 1, characterized in that: The detonation protection mechanism (120) comprises a fixed cylinder (121), a plunger rod (122), and a short-circuit control electrode (123) fixed to the surface of the fixed cylinder (121); the end of the short-circuit control electrode (123) is connected to an explosive (124) located inside the fixed cylinder (121); one end of the plunger rod (122) is slidably sleeved on the inside of the fixed cylinder (121); the fixed cylinder (121) is fixed to the inside of a sealing cover box (110); and one end of the plunger rod (122) is arranged opposite to the electromagnetic drive assembly (400).

3. An indoor high-voltage grounding switch according to claim 2, characterized in that: The end of the short-circuit control electrode (123) is used to connect to a control circuit, and ignites the detonator (124) when triggered by a short-circuit command signal. The detonator (124) is a sodium azide particle structure, and generates a large amount of gas when triggered by the short-circuit command signal to push the plunger rod (122), the electromagnetic drive assembly (400) and the lock rod (200) to move linearly.

4. An indoor high-voltage grounding switch according to claim 1, characterized in that: The surface of the excitation disk (420) is provided with a wing plate which is slidably sleeved on the surface of the guide rod (111), and the input end of the excitation disk (420) is electrically connected to a controller for passing an alternating current through the excitation coil according to instructions.

5. An indoor high-voltage grounding switch according to claim 1, characterized in that: The spring (321) is a tension spring structure, with two ends respectively connected to the inner wall of the vacuum box body (100) and the moving guide frame (320) and in a tensioned state, and the moving toothed disc (331) and the fixed toothed disc (332) are ratchet structures for inhibiting the free rotation of the screw sleeve ring (330).

6. An indoor high-voltage grounding switch according to claim 1, characterized in that: A sliding pin is provided on one side of the rotating seat (340) for guiding the screw collar (330) to slide linearly against the surface of the rotating seat (340).

7. An indoor high-voltage grounding switch according to claim 1, characterized in that: The ends of the access electrode (220) and the grounding electrode (342) respectively pass through the sealing cover box (110) and the vacuum box body (100) and are used to connect the circuit and the grounding circuit.

8. An indoor high-voltage grounding switch according to claim 1, characterized in that: The vacuum box body (100) and the sealing cover box (110) are transparent acrylic material components, and the inside of the vacuum box body (100) and the sealing cover box (110) is a vacuum environment.

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