A knife switch

Abstract

The utility model discloses a knife switch, including mounting seat, the mounting seat front end surface fixedly connected with multiple sets of connecting seat, be connected with the movable contact assembly on the connecting seat, the movable contact assembly includes movable contact, elastic clamping plate, insulating plate and fastener, movable contact one end rotation is connected in the connecting seat surface, movable contact outer wall both sides fixedly connected with the guide rod, movable contact outer wall both sides are located in the guide rod rear and are equipped with the fastening hole, movable contact outer wall both sides are connected with elastic clamping plate through the guide rod contact, and the elastic clamping plate inner wall and movable contact outer wall contact, the fastener passes through the fastening hole and realizes the compression of elastic clamping plate, be provided with the insulating plate between the fastener and elastic clamping plate, the utility model discloses the elastic compression structure of elastic clamping plate, greatly reduced the probability of appearing loose in contact part after long -term use, significantly improved the contact reliability of knife switch, prolonged the service life of equipment.

Description

Technical Field

[0001] This utility model relates to the field of knife switch technology, specifically a knife switch. Background Technology

[0002] A knife switch, also known as a disconnector switch or isolating switch, is used in circuits to isolate power supplies and ensure the safety of circuits and equipment. Knife switches are widely used in branch boxes and grid-connected boxes because they have a clearly visible disconnect point and are easy to operate.

[0003] Existing knife switches operate by rotating a handle to insert or remove a blade into the knife clip contact, thus closing or opening the circuit. However, during the closing operation, excessive or insufficient force can cause the blade to insert too shallowly or too deeply into the knife clip contact, resulting in unstable contact between the blade and the contact. Furthermore, after repeated insertion and removal, the two contact pieces on the knife clip responsible for contacting the blade tend to widen outwards, increasing the gap between them and affecting contact stability. Summary of the Invention

[0004] The purpose of this invention is to provide a knife switch to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a knife switch, including a mounting base, with multiple sets of connecting seats fixedly connected to the front surface of the mounting base, a moving contact assembly rotatably connected to the connecting seats, and a stationary contact assembly that mates with the moving contact assembly fixedly mounted on the rear surface of the mounting base. The moving contact assembly includes a moving contact, an elastic clamping plate, an insulating plate, and fasteners. One end of the moving contact is rotatably connected to the surface of the connecting seats. Guide rods are fixedly connected to both sides of the outer wall of the moving contact. Fastening holes are provided on both sides of the outer wall of the moving contact behind the guide rods. The elastic clamping plate is contacted and connected to both sides of the outer wall of the moving contact through the guide rods, and the inner wall of the elastic clamping plate is in contact with the outer wall of the moving contact. The fasteners pass through the fastening holes to press the elastic clamping plate. An insulating plate is provided between the fasteners and the elastic clamping plate.

[0006] Preferably, the stationary contact assembly includes a stationary contact and a terminal block. The stationary contact is mounted on the surface of the mounting base, and a terminal block extending rearward is connected to the stationary contact. A moving contact is movably contacted on the surface of the stationary contact.

[0007] Preferably, the stationary contact includes a fixing plate and a contact head. The fixing plate is mounted on the surface of the mounting base. The contact head is fixedly connected to the center of the fixing plate surface, and the surface of the contact head is in movable contact with the surface of the moving contact. Positioning rods are fixedly connected to both sides of the contact head on the surface of the fixing plate. Positioning holes are opened on the surface of the terminal block at the positions opposite to the positioning rods, and the inner wall of the positioning hole is movably connected to the outer wall of the positioning rod. An arc-extinguishing chamber is snapped into the fixing plate.

[0008] Preferably, the fixing plate adopts a U-shaped structure design.

[0009] Preferably, the mounting base surface has an opening between the connecting base and the stationary contact assembly, and an operating component is movable within the opening. The operating component includes a pull plate and a connecting rod. The top of the pull plate is fixedly connected to a connecting rod for connecting multiple moving contact assemblies, and the connecting rod is connected to the moving contact at the bottom. The pull plate moves within the opening.

[0010] Preferably, limiting rods for limiting the movement of the moving contact are fixedly connected to both sides of the outer wall of the contact head.

[0011] Beneficial effects

[0012] Compared with existing technologies, the beneficial effects of this utility model are as follows:

[0013] In terms of contact stability, the elastic clamp in the moving contact assembly plays a crucial role in this invention. The elastic clamp is pressed firmly onto both sides of the outer wall of the moving contact by fasteners, with its inner wall in close contact with the outer wall of the moving contact. When the moving contact contacts the contact head of the stationary contact assembly, the elastic clamp applies a continuous elastic force to the moving contact, ensuring a stable contact state between the moving contact and the contact head. This avoids poor contact caused by improper force applied during closing, resulting in the moving contact being inserted too shallowly or too deeply. Furthermore, compared to the tendency of knife-clamp contacts to open in traditional knife switches, this invention, through the elastic clamping structure of the elastic clamp, significantly reduces the probability of loosening at the contact points after long-term use, significantly improving the contact reliability of the knife switch and extending the service life of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the mating structure of the moving contact assembly of this utility model;

[0016] Figure 3 This is a schematic diagram of the static contact assembly structure of this utility model.

[0017] The correspondence between the labels and component names in the attached figures is as follows:

[0018] 1. Mounting base; 2. Connecting base; 3. Moving contact assembly; 4. Stationary contact assembly; 5. Operating assembly;

[0019] 11. Through port; 31. Moving contact; 32. Flexible clamp; 33. Insulating plate; 34. Fastener;

[0020] 35. Guide rod; 36. Fastening hole; 41. Stationary contact; 42. Terminal block; 43. Arc extinguishing chamber;

[0021] 51. Connecting rod; 52. Pulling plate; 411. Fixing plate; 412. Contact head; 413. Positioning rod;

[0022] 414. Limiting rod; 421. Positioning hole. Detailed Implementation

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

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "vertical," and "horizontal," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] like Figure 1-3 This is a schematic diagram of a preferred embodiment of the knife switch of the present invention. In this embodiment, the knife switch includes a mounting base 1. Multiple sets of connecting seats 2 are fixedly connected to the front surface of the mounting base 1. A moving contact assembly 3 is rotatably connected to the connecting seats 2. A stationary contact assembly 4, which mates with the moving contact assembly 3, is fixedly mounted on the rear surface of the mounting base 1. An opening 11 is provided on the surface of the mounting base 1 between the connecting seats 2 and the stationary contact assembly 4. An operating component 5 is movable within the opening 11. Through the operating component 5, the contact and separation of the moving contact assembly 3 and the stationary contact assembly 4 can be achieved, thereby completing the circuit switching operation.

[0026] In this embodiment, as Figure 2As shown, the moving contact assembly 3 is a key moving component for realizing the circuit switching, including the moving contact 31, the elastic clamp 32, the insulating plate 33, and the fastener 34. One end of the moving contact 31 is rotatably connected to the surface of the connecting base 2, and can rotate around the connecting base 2 to achieve contact and separation with the stationary contact assembly 4.

[0027] Guide rods 35 are fixedly connected to both sides of the outer wall of the moving contact 31, and the guide rods 35 serve to position and guide. Fastening holes 36 are provided on both sides of the outer wall of the moving contact 31 behind the guide rods 35, providing a position for the installation of fasteners 34.

[0028] The moving contact 31 has elastic clamping plates 32 connected to both sides of its outer wall via guide rods 35. The inner wall of the elastic clamping plates 32 is in contact with the outer wall of the moving contact 31. During installation, the elastic clamping plates 32 are initially positioned on both sides of the outer wall of the moving contact 31 via the guide rods 35 to ensure accurate positioning. Then, fasteners 34 pass through fastening holes 36 to press the elastic clamping plates 32, allowing them to apply a continuous elastic force to the moving contact 31. An insulating plate 33 is placed between the fasteners 34 and the elastic clamping plates 32. The insulating plate 33 serves as insulation to prevent electrical conductivity between the fasteners 34 and the elastic clamping plates 32, ensuring the safety of the knife switch.

[0029] In this embodiment, as Figure 3 As shown, the stationary contact assembly 4, used in conjunction with the moving contact assembly 3, enables circuit connection. It includes a stationary contact 41 and a terminal block 42. The stationary contact 41 is mounted on the surface of the mounting base 1, and a rearwardly extending terminal block 42 is connected to the stationary contact 41 for connection to an external circuit. When the knife switch is closed, the surface of the stationary contact 41 makes contact with the surface of the moving contact 31, thus enabling circuit connection.

[0030] The stationary contact 41 specifically includes a fixing plate 411 and a contact head 412. The fixing plate 411 is mounted on the surface of the mounting base 1, providing mounting support for the entire stationary contact 41. The fixing plate 411 adopts a U-shaped structure design, which is conducive to the installation of the arc-extinguishing chamber 43. The arc-extinguishing chamber 43 is snapped into the fixing plate 411. The arc-extinguishing chamber 43 can quickly extinguish the arc when the circuit is broken, protecting the contacts of the knife switch from arc damage.

[0031] A contact head 412 is fixedly connected to the center of the surface of the fixed plate 411. The surface of the contact head 412 is in movable contact with the surface of the moving contact 31, and is the key contact part for realizing current conduction. Limiting rods 414 are fixedly connected to both sides of the outer wall of the contact head 412 to limit the movement of the moving contact 31. The limiting rods 414 can restrict the contact position of the moving contact 31, ensuring accurate contact between the moving contact 31 and the contact head 412, and further improving the stability of the contact.

[0032] Positioning rods 413 are fixedly connected to the surface of the fixing plate 411 on both sides of the contact head 412. Positioning holes 421 are opened on the surface of the terminal block 42 at the opposite position of the positioning rods 413. During installation, the inner wall of the positioning hole 421 is movably connected to the outer wall of the positioning rod 413. Through the cooperation of the positioning rod 413 and the positioning hole 421, the terminal block 42 and the fixing plate 411 are accurately connected, ensuring the installation position accuracy of the terminal block 42.

[0033] In this embodiment, the operating component 5 is a part used to operate the moving contact assembly 3, including a pull plate 52 and a connecting rod 51. The top of the pull plate 52 is fixedly connected to the connecting rod 51 for connecting multiple moving contact assemblies 3, and the connecting rod 51 is connected to the bottom of the moving contact 31. The pull plate 52 moves within the opening 11. When a closing or opening operation is required, by pulling or pushing the pull plate 52, the pull plate 52 drives the connecting rod 51 to move, thereby driving the moving contact 31 to rotate around the connecting seat 2, realizing the contact and separation of the moving contact 31 and the stationary contact assembly 4.

[0034] Working principle

[0035] When the circuit needs to be closed, the pull plate 52 is pulled. The pull plate 52, through the connecting rod 51, drives the moving contact 31 to rotate around the connecting seat 2 towards the stationary contact assembly 4, so that the moving contact 31 contacts the contact head 412 of the stationary contact 41. During the contact process, the limiting rod 414 limits the moving contact 31 to ensure accurate contact position. At this time, the elastic clamp 32 in the moving contact assembly 3 applies an elastic force to the moving contact 31 under the action of the fastener 34, so that the moving contact 31 and the contact head 412 are in close contact, realizing the conduction of current.

[0036] When the circuit needs to be disconnected, the pull plate 52 is pushed, and under the action of the connecting rod 51, the moving contact 31 rotates around the connecting seat 2 in a direction away from the stationary contact assembly 4. The moving contact 31 separates from the contact head 412, and the circuit is disconnected. During the disconnection process, the arc-extinguishing chamber 43 quickly extinguishes the generated arc, protecting the contacts of the knife switch.

[0037] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A knife switch, comprising a mounting base (1), wherein a plurality of connecting seats (2) are fixedly connected to the front end surface of the mounting base (1), a moving contact assembly (3) is rotatably connected to the connecting seat (2), and a stationary contact assembly (4) that engages with the moving contact assembly (3) is fixedly mounted on the rear end surface of the mounting base (1), characterized in that: The moving contact assembly (3) includes a moving contact (31), an elastic clamp (32), an insulating plate (33), and a fastener (34). One end of the moving contact (31) is rotatably connected to the surface of the connecting seat (2). Guide rods (35) are fixedly connected to both sides of the outer wall of the moving contact (31). Fastening holes (36) are opened on both sides of the outer wall of the moving contact (31) behind the guide rods (35). The elastic clamp (32) is contacted and connected to both sides of the outer wall of the moving contact (31) through the guide rods (35). The inner wall of the elastic clamp (32) is in contact with the outer wall of the moving contact (31). The fastener (34) passes through the fastening hole (36) to press the elastic clamp (32). An insulating plate (33) is provided between the fastener (34) and the elastic clamp (32).

2. The knife switch according to claim 1, characterized in that: The stationary contact assembly (4) includes a stationary contact (41) and a terminal block (42). The stationary contact (41) is mounted on the surface of the mounting base (1). The terminal block (42) extends backward and is connected to the stationary contact (41). The stationary contact (41) has a moving contact (31) in movable contact with it.

3. A knife switch according to claim 2, characterized in that: The stationary contact (41) includes a fixing plate (411) and a contact head (412). The fixing plate (411) is mounted on the surface of the mounting base (1). The contact head (412) is fixedly connected to the middle of the surface of the fixing plate (411), and the surface of the contact head (412) is in movable contact with the surface of the moving contact (31). Positioning rods (413) are fixedly connected to both sides of the contact head (412) on the surface of the fixing plate (411). Positioning holes (421) are opened on the surface of the terminal block (42) at the position opposite to the positioning rods (413), and the inner wall of the positioning hole (421) is movably connected to the outer wall of the positioning rod (413). An arc-extinguishing chamber (43) is snapped into the fixing plate (411).

4. A knife switch according to claim 3, characterized in that: The fixing plate (411) adopts a concave structure design.

5. A knife switch according to claim 2, characterized in that: The mounting base (1) has an opening (11) between the connecting base (2) and the stationary contact assembly (4), and an operating component (5) is movable in the opening (11). The operating component (5) includes a pull plate (52) and a connecting rod (51). The top of the pull plate (52) is fixedly connected to a connecting rod (51) for connecting multiple moving contact assemblies (3), and the connecting rod (51) is connected to the moving contact (31) at the bottom. The pull plate (52) is movable in the opening (11).

6. A knife switch according to claim 3, characterized in that: The outer walls of the contact head (412) are fixedly connected with limiting rods (414) for limiting the movement of the moving contact (31).

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