An indoor knife switch locking device

Abstract

This utility model relates to an indoor knife switch interlocking device, including a knife switch base, a control handle on the knife switch base, and a locking structure on the knife switch base for locking the position of the control handle in the open state. The locking structure includes a positioning frame fixedly installed on the knife switch base. This indoor knife switch interlocking device utilizes the abutment plate of the locking member, under the action of an elastic component, to abut against the moving contact piece to one side. This, combined with a trapezoidal locking block, restricts the moving contact piece's vertical movement within the positioning groove. When the casing is open for maintenance, even if the operator accidentally touches the control handle, the moving contact piece will be rigidly blocked by the trapezoidal locking block, preventing it from moving in the closing direction. This physically prevents accidents caused by exposed electric arcs when closing the switch with the casing open. During normal opening, no manual operation of the interlocking structure is required; simply pressing down the control handle automatically pushes open the locking member through the contact between the moving contact piece and the inclined surface, achieving self-locking upon opening, thus balancing safety and ease of operation.

Description

Technical Field

[0001] This utility model relates to the field of knife switch technology, specifically to an indoor knife switch locking device. Background Technology

[0002] A knife switch, also known as a knife circuit breaker, consists of a knife switch and a fuse enclosed in a steel plate or cast iron shell. The knife switch has a quick-cutting blade and is manually operated. During the inspection, maintenance, or troubleshooting of electrical equipment, the knife switch is used to disconnect the indoor circuit from the power supply, creating a clear disconnection point to ensure the safety of maintenance personnel and avoid the risk of electric shock. It can also be used to control some low-current circuits, such as lighting circuits and signal circuits, but it cannot be used to cut off high currents or short-circuit currents.

[0003] A knife switch consists of a ceramic handle, a rubber cover, a ceramic base, a stationary contact, a moving contact, a fuse terminal, a power supply terminal, and a load terminal. It works by moving the ceramic handle to move the moving contact, controlling the moving contact to contact the stationary contact to form a circuit, or controlling the moving contact to move away from the stationary contact to form a circuit.

[0004] In actual maintenance, when the switch housing is open, the core components such as the switch contacts and electrical terminals are directly exposed to the operating environment. If the ceramic handle is moved due to improper operation, the moving contact and the stationary contact may come into contact. At the moment of closing, an electric arc will be generated between the contacts. Since there is no housing to restrict it, the electric arc will be directly exposed. The high-temperature electric arc can burn the operator and even ignite the surrounding combustibles, thus causing a safety accident. Therefore, an indoor switch interlocking device is proposed to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an indoor knife switch interlocking device that automatically locks the moving contact on the control handle. This solves the problem that when the knife switch housing is open, the core components such as the contacts and electrical terminals are directly exposed to the operating environment. If improper operation causes the ceramic handle to move, resulting in contact between the moving and stationary contacts, an electric arc will be generated between the contacts at the moment of closing. Since there is no housing to restrict this, the electric arc will be directly exposed, and the high-temperature arc can burn the operator or even ignite surrounding flammable materials, thus causing a safety accident.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an indoor knife switch locking device, comprising a knife switch base, a control handle provided on the knife switch base, and a locking structure provided on the knife switch base for locking the position of the control handle in the open state;

[0007] The locking structure includes a positioning frame fixedly installed on the knife switch base. The positioning frame has two locking members inside for fixing the moving contact piece of the control handle. Each of the two locking members is provided with an elastic component for squeezing it to move to the opposite side. The two locking members are also provided with a linkage component to facilitate simultaneous control of their movement.

[0008] The positioning frame has several positioning slots that are adapted to the moving contact piece of the control handle, and the positioning frame has several limiting slots.

[0009] The locking component includes a trapezoidal locking block, which has an inclined surface that can contact the movable contact piece of the pressing control handle. An abutment plate for abutting the movable contact piece is fixedly connected to the trapezoidal locking block. A limiting post that is slidably connected to the limiting groove is fixedly connected to the trapezoidal locking block. A guide rod that penetrates the positioning frame is fixedly installed on the abutment plate, and the elastic component is located on the guide rod.

[0010] Furthermore, the elastic component includes a washer that is slidably mounted on the guide rod, and the washer is in contact with the inner wall of the positioning frame. A spring is fixedly connected to one side of the washer, and the spring is sleeved on the outer surface of the guide rod.

[0011] Furthermore, the linkage component includes two connecting blocks, with the connecting blocks on the same side intersecting with the abutment plate on the same side, and a linkage rod is hinged to the two connecting blocks.

[0012] Furthermore, the locking element and the elastic component are symmetrically distributed from left to right, and the positioning frame has two symmetrically distributed through holes, with the inner wall of the through holes slidably connected to the guide rod.

[0013] Furthermore, the control handle is connected to the knife switch base, and the knife switch base is provided with a cover. One end of the control handle passes through the cover and extends to its outside.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0015] 1. This indoor knife switch interlocking device uses the abutment plate of the locking component to press against the moving contact piece to one side under the action of the elastic component. In conjunction with the trapezoidal locking block, it restricts the moving contact piece from moving up and down in the positioning groove. When the outer casing is opened for maintenance, even if the operator accidentally touches the control handle, the moving contact piece will be rigidly blocked by the trapezoidal locking block and cannot move in the closing direction. This physically eliminates the accident of exposed electric arc when closing the switch in the open state, and solves the safety hazards existing in the prior art.

[0016] 2. This indoor knife switch interlocking device utilizes the inclined surface design of the trapezoidal locking block, combined with the horizontal component force when the moving contact plate is pressed down. During normal opening, there is no need to manually operate the interlocking structure. Simply pressing down the control handle will automatically push open the locking element by the contact between the moving contact plate and the inclined surface, achieving self-locking when opening the switch, thus balancing safety and ease of operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is an enlarged view of the locking structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the structural positioning frame, locking component, and linkage component of this utility model;

[0020] Figure 4 This is an exploded view of the locking component and linkage component of this utility model.

[0021] Figure 5 This is a schematic diagram of the cover structure of this utility model.

[0022] In the diagram: 1. Knife switch base; 2. Control handle; 3. Locking structure; 31. Positioning frame; 311. Positioning groove; 312. Limiting groove; 32. Locking component; 321. Trapezoidal locking block; 322. Inclined surface; 323. Abutment plate; 324. Limiting post; 325. Guide rod; 33. Elastic component; 331. Washer ring; 332. Spring; 34. Linkage component; 341. Connecting block; 342. Linking rod; 4. Cover. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1: Please refer to Figure 1-5 An indoor knife switch locking device in this embodiment includes a knife switch base 1, a control handle 2 on the knife switch base 1, and a locking structure 3 on the knife switch base 1 for locking the position of the control handle 2 in the open state. The control handle 2 is connected to the knife switch base 1, and a cover 4 is provided on the knife switch base 1. One end of the control handle 2 passes through the cover 4 and extends to its outside.

[0025] Example 2: Please refer to Figure 1-5Based on the first embodiment, the locking structure 3 includes a positioning frame 31 fixedly installed on the knife switch base 1. The positioning frame 31 has two locking members 32 for fixing the moving contact piece of the control handle 2. Both locking members 32 are provided with elastic members 33 for squeezing them to move to the opposite side. Both locking members 32 are provided with linkage members 34 to facilitate simultaneous control of their movement.

[0026] The positioning frame 31 has several positioning slots 311 that are adapted to the moving contact piece of the control handle 2, and the positioning frame 31 has several limiting slots 312.

[0027] The locking component 32 includes a trapezoidal locking block 321. The trapezoidal locking block 321 is provided with an inclined surface 322 that can contact the movable contact piece of the pressing control handle 2. An abutment plate 323 for abutting the movable contact piece is fixedly connected to the trapezoidal locking block 321. A limiting post 324 that is slidably connected to the limiting groove 312 is fixedly connected to the trapezoidal locking block 321. A guide rod 325 that penetrates the positioning frame 31 is fixedly installed on the abutment plate 323, and the elastic component 33 is located on the guide rod 325.

[0028] The elastic component 33 includes a washer 331 that is slidably mounted on the guide rod 325 and contacts the inner wall of the positioning frame 31. A spring 332 is fixedly connected to one side of the washer 331 and is sleeved on the outer surface of the guide rod 325. The elastic force of the spring 332 ensures that the abutment plate 323 always tightly abuts the moving contact piece and can maintain the locking strength even after long-term use.

[0029] In addition, the two locking parts 32 and the elastic part 33 are symmetrically distributed on the left and right. The positioning frame 31 has two symmetrically distributed through holes, and the inner wall of the through holes is slidably connected to the guide rod 325, so that the moving contact piece is locked on both sides at the same time, ensuring that the moving contact piece is subjected to uniform force and reducing mechanical wear.

[0030] Using the above technical solution, the control handle 2 is flipped so that the moving contact of the control handle 2 disengages from the stationary contact and inserts into the limiting groove 312 inside the positioning frame 31. At this time, the moving contact presses the inclined surface 322 on the trapezoidal locking block 321, thereby causing the two trapezoidal locking blocks 321 to move to opposite sides. The moving trapezoidal locking blocks 321 compress the spring 332 in the elastic component 33 until the moving contact flips to the side of the abutment plate 323. At this time, the spring 332 returns from the compressed state to the initial state, thereby pressing the two abutment plates 323 to move to opposite sides until the abutment plates 323 contact the moving contact. At this time, one end of the trapezoidal locking block 321 moves to the top of the moving contact, thereby achieving automatic locking of the moving contact using the trapezoidal locking block 321 and the abutment plate 323, and realizing the open and locked state.

[0031] Example 3: Please refer to Figure 1-5Based on Embodiment 2, the linkage component 34 includes two connecting blocks 341, and the connecting blocks 341 on the same side are connected to the abutment plate 323 on the same side. The two connecting blocks 341 are hinged with a linkage rod 342.

[0032] By using the above technical solution, the connecting rod 342 in the linkage component 34 is pressed upward, so that the connecting rod 342 drives the two abutment plates 323 through the two connecting blocks 341 respectively, controlling the two abutment plates 323 and the two trapezoidal locking blocks 321 to move to opposite sides, thereby releasing the positioning of the moving contact piece of the control handle 2, and the closing state can be achieved by flipping the control handle 2.

[0033] The working principle of the above embodiments is as follows:

[0034] When the cover 4 needs to be opened for maintenance, the control handle 2 is flipped so that the moving contact of the control handle 2 is disengaged from the stationary contact and inserted into the limiting groove 312 inside the positioning frame 31. At this time, the moving contact presses the inclined surface 322 on the trapezoidal locking block 321, thereby causing the two trapezoidal locking blocks 321 to move to opposite sides. The moving trapezoidal locking blocks 321 compress the spring 332 in the elastic component 33 until the moving contact flips to the side of the abutment plate 323.

[0035] At this time, the spring 332 returns to its initial state from the compressed state, thereby squeezing the two abutment plates 323 to move to the opposite side until the abutment plates 323 contact the moving contact piece. At this time, one end of the trapezoidal locking block 321 moves to the top of the moving contact piece, thereby achieving automatic locking of the moving contact piece by using the trapezoidal locking block 321 and the abutment plates 323, and realizing the open lockout state.

[0036] Then the cover 4 can be disassembled and inspected. After the inspection is completed, the cover 4 is reinstalled and the linkage rod 342 in the linkage component 34 is pressed upward. This causes the linkage rod 342 to drive the two abutment plates 323 through the two connecting blocks 341, thereby controlling the two abutment plates 323 and the two trapezoidal locking blocks 321 to move to opposite sides. This releases the positioning of the moving contact piece of the control handle 2, and the circuit breaker can be closed by flipping the control handle 2.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An indoor knife switch locking device, comprising a knife switch base (1), characterized in that: The knife switch base (1) is provided with a control handle (2), and the knife switch base (1) is provided with a locking structure (3) for locking the position of the control handle (2) in the disconnected state. The locking structure (3) includes a positioning frame (31) fixedly installed on the knife switch base (1). The positioning frame (31) has two locking parts (32) for fixing the moving contact piece of the control handle (2). Both locking parts (32) are provided with elastic components (33) for squeezing them to move to the opposite side. Both locking parts (32) are provided with linkage components (34) to facilitate simultaneous control of their movement. The positioning frame (31) has several positioning slots (311) adapted to the moving contact piece of the control handle (2), and the positioning frame (31) has several limiting slots (312). The locking component (32) includes a trapezoidal locking block (321), on which a sloping surface (322) is provided that can contact the movable contact piece of the pressing control handle (2). An abutment plate (323) for abutting the movable contact piece is fixedly connected to the trapezoidal locking block (321). A limiting post (324) that is slidably connected to the limiting groove (312) is fixedly connected to the trapezoidal locking block (321). A guide rod (325) that penetrates the positioning frame (31) is fixedly installed on the abutment plate (323), and an elastic component (33) is located on the guide rod (325).

2. An indoor pole-mounted switch locking device according to claim 1, characterized in that: The elastic component (33) includes a washer (331) slidably mounted on the guide rod (325), and the washer (331) contacts the inner wall of the positioning frame (31). A spring (332) is fixedly connected to one side of the washer (331), and the spring (332) is sleeved on the outer surface of the guide rod (325).

3. An indoor knife switch locking device according to claim 1, characterized in that: The linkage component (34) includes two connecting blocks (341), and the connecting block (341) on the same side intersects with the abutment plate (323) on the same side. The two connecting blocks (341) are hinged with a linkage rod (342).

4. The indoor pole shuttering device according to claim 1, wherein: The two locking members (32) and the elastic member (33) are symmetrically distributed on the left and right. The positioning frame (31) has two symmetrically distributed through holes, and the inner wall of the through holes is slidably connected to the guide rod (325).

5. The indoor knife switch locking device according to claim 1, characterized in that: The control handle (2) is connected to the knife switch base (1), and a cover (4) is provided on the knife switch base (1). One end of the control handle (2) passes through the cover (4) and extends to its outside.

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