Low voltage single phase knife switch

Abstract

The utility model low pressure single -phase knife fuse switch, including insulator post, one end of insulator post is provided with first conducting rack, the other end of insulator post is provided with second conducting rack, be provided with the clamping piece on second conducting rack, the first conducting rack is rotatably connected with static turn knife, the end of static turn knife is installed with insulating turn blade through bolt, the end of insulating turn blade is installed with dynamic turn knife through bolt, the end of dynamic turn knife is in contact with clamping piece, the side surface of the other end of insulator post is fixedly connected with support seat. In the utility model, when dynamic turn knife is closed after being clamped between clamping piece and second wiring seat, the spring elasticity is used to push the insulating block to move to the top of dynamic turn knife, the side of dynamic turn knife is fixed in position by the insulating block, avoids dynamic turn knife from loosening when closing, guarantees the operation stability of the device, and the practicality is good.

Description

Technical Field

[0001] This utility model relates to the field of knife fuse switch technology, and more specifically, to a low-voltage single-phase knife fuse switch. Background Technology

[0002] Knife-type disconnect switches, also known as fuse-type isolating switches, are among the simplest and most widely used low-voltage electrical appliances in manual control systems. They are particularly useful for controlling the opening and closing of a single-phase switch. Simply pulling the handle up causes the moving contact of the knife-type switch to contact the stationary contact, closing the circuit. Pulling the handle down disconnects the moving and stationary contacts, breaking the circuit. During operation, if the load power is too high, the excessive current flowing through the fuse will cause it to heat up and melt, protecting the circuit. After troubleshooting, the fuse can be replaced for continued use. This type of combined switch simplifies the structure of power distribution equipment and is widely used in low-voltage power distribution systems. However, existing solutions rely solely on clamps for fixing the moving contact blade, which can lead to the blade itself loosening, resulting in poor stability and making routine replacement of the fuse inconvenient. Therefore, we have proposed a low-voltage single-phase knife-type disconnect switch. Utility Model Content

[0003] In view of the problems existing in the prior art, the purpose of this utility model is to provide a low-voltage single-phase knife fuse switch.

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] A low-voltage single-phase knife-type fuse switch includes an insulator post. A first conductive frame is provided at one end of the insulator post, and a second conductive frame is provided at the other end. A clamping plate is provided on the second conductive frame. A stationary knife is rotatably connected to the first conductive frame. An insulating blade is bolted to the end of the stationary knife, and a movable knife is bolted to the end of the insulating blade. The end of the movable knife contacts the clamping plate. A support base is fixedly connected to the side of the other end of the insulator post. A limit seat is fixedly sleeved on the support base. A telescopic groove is provided at the end of the limit seat. A spring is fixedly connected to the inner wall of the telescopic groove. An insulating block is fixedly connected to the end of the spring. The end of the insulating block is movably sleeved above the end of the movable knife. A pull rod is fixedly connected to the other end of the insulating block. The end of the pull rod is movably sleeved outside the limit seat and fixedly connected to a pull plate. A fuse mechanism is provided between the stationary knife and the movable knife.

[0006] As a preferred embodiment of this utility model, the fusing mechanism includes arc-shaped bases fixedly connected to the sides of the stationary and moving cutters respectively. Arc-shaped covers are hinged to the sides of the two arc-shaped bases. A fusing tube is sleeved between the two arc-shaped bases and the two arc-shaped covers. Connecting blocks are provided at the ends of the arc-shaped covers and the arc-shaped bases. A wing screw is threaded onto each pair of connecting blocks.

[0007] In a preferred embodiment of this utility model, a first terminal block is installed on the first conductive frame by bolts, and the side of the first terminal block is in contact with the side of the stationary turn knife.

[0008] In a preferred embodiment of this utility model, a second terminal block is installed on the second conductive frame by bolts, and the side of the second terminal block is in contact with the side of the moving blade.

[0009] As a preferred embodiment of this utility model, an mounting bracket is bolted onto the insulator post, and a pull ring is bolted onto the side of the insulating blade.

[0010] In a preferred embodiment of this utility model, the inner wall of the expansion groove is in contact with the side of the insulating block.

[0011] Compared with existing technologies, the advantages of this utility model are:

[0012] (1) In this utility model, when the moving knife is inserted between the clamp and the second terminal block and the circuit is closed, the spring force is used to push the insulating block to move above the moving knife. The insulating block is used to limit and fix the side of the moving knife, so as to prevent the moving knife from coming loose on its own when the circuit is closed, thus ensuring the operational stability of the device and making it practical.

[0013] (2) In this utility model, when the fuse tube melts, the switch is turned off and the wing screw is removed from the two connecting blocks, thereby opening the two arc-shaped covers to take out the fuse tube. A new fuse tube is installed on the inside of the two arc-shaped bases and the two arc-shaped covers. The wing screw is used to fix the two connecting blocks, and the arc-shaped covers and arc-shaped bases are used to clamp and fix the fuse tube, so as to realize the convenient replacement of the fuse tube. 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 static turn cutter of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the insulator post of this utility model;

[0017] Figure 4This is a cross-sectional schematic diagram of the limiting seat of this utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the fuse mechanism of this utility model.

[0019] Explanation of the labels in the diagram:

[0020] 1. Insulator post; 2. First conductive frame; 3. Second conductive frame; 4. Clamping plate; 5. Stationary turn knife; 6. Insulating turn knife blade; 7. Moving turn knife; 8. Fusible mechanism; 9. Support base; 10. Limiting seat; 11. Expansion groove; 12. Spring; 13. Insulating block; 14. Pull rod; 15. Pull plate; 16. Arc-shaped base; 17. Arc-shaped cover; 18. Fusible tube; 19. Connecting block; 20. Wing screw; 21. First terminal block; 22. Second terminal block; 23. Pull ring; 24. Mounting bracket. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," 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 this utility model 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" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example 1:

[0025] like Figures 1 to 5As shown, a low-voltage single-phase knife-fuse switch includes an insulator post 1. A first conductive frame 2 is provided at one end of the insulator post 1, and a second conductive frame 3 is provided at the other end. A clamping plate 4 is provided on the second conductive frame 3. A stationary blade 5 is rotatably connected to the first conductive frame 2. A hook is provided at the end of the stationary blade 5. A pin for hook connection is provided on the first conductive frame 2. An insulating blade 6 is bolted to the end of the stationary blade 5, and a movable blade 7 is bolted to the end of the insulating blade 6. The end of the movable blade 7 contacts the clamping plate 4. A support base 9 is fixedly connected to the side of the other end of the insulator post 1. A limit seat 10 is fixedly sleeved on the support base 9. A telescopic groove 11 is provided at the end of the limit seat 10. A spring 12 is fixedly connected to the inner wall of the telescopic groove 11. An insulating block 13 is fixedly connected to the end of the spring 12. The end of the insulating block 13 is movably sleeved above the end of the movable blade 7. A pull rod 14 is fixedly connected to the other end of block 13. The end of pull rod 14 is movably sleeved to the outside of limit seat 10 and fixedly connected to pull plate 15. The inner wall of telescopic groove 11 is in contact with the side of insulating block 13. A fuse mechanism 8 is provided between stationary turn knife 5 and moving turn knife 7. A first terminal block 21 is installed on the first conductive frame 2 by bolts. The side of the first terminal block 21 is in contact with the side of stationary turn knife 5 to ensure that the first terminal block 21 and stationary turn knife 5 can conduct electricity. A second terminal block 22 is installed on the second conductive frame 3 by bolts. The side of the second terminal block 22 is in contact with the side of moving turn knife 7 to ensure that the moving turn knife 7 and the second terminal block 22 can conduct electricity. A conductive path is formed between the first terminal block 21, the first conductive frame 2, the stationary turn knife 5, the arc-shaped base 16, the arc-shaped cover 17, the fuse tube 18, the moving turn knife 7, the second conductive frame 3, the second terminal block 22 and the clamp 4.

[0026] Example 2:

[0027] Based on Example 1, such as Figure 1 and Figure 5 As shown, the fusing mechanism 8 includes arc-shaped bases 16 fixedly connected to the sides of the stationary cutter 5 and the moving cutter 7, respectively. Arc-shaped covers 17 are hinged to the sides of the two arc-shaped bases 16. A fusing tube 18 is sleeved between the two arc-shaped bases 16 and the two arc-shaped covers 17. Connecting blocks 19 are provided at the ends of the arc-shaped covers 17 and the arc-shaped bases 16. A wing screw 20 is threaded on each pair of connecting blocks 19. The connecting blocks 19 are provided with screw holes for installing the wing screw 20. The inner diameter of the arc-shaped covers 17 and the arc-shaped bases 16 is equal to the outer diameter of both ends of the fusing tube 18, ensuring the stability and firmness of the installation of the fusing tube 18.

[0028] Example 3:

[0029] Based on Embodiment 1 and Embodiment 2, such as Figure 1As shown, an mounting bracket 24 is bolted onto the insulator post 1. The mounting bracket 24 and the U-shaped screw bracket work together to install and fix the knife switch. This is the prior art. A pull ring 23 is bolted to the side of the insulating blade 6. The pull ring 23 is used to open and close the switch consisting of the stationary blade 5, the insulating blade 6, the moving blade 7 and the fuse mechanism 8.

[0030] It should be noted that this utility model is a low-voltage single-phase knife fuse switch. When the switch is closed, pulling the pull plate 15 moves the insulating block 13 and the pull rod 14, causing the insulating block 13 to retract into the inner cavity of the telescopic groove 11. At the same time, the spring 12 is compressed, causing the stationary knife 5, the insulating knife 6 and the moving knife 7 to rotate, so that the knife fuse switch is closed. At this time, the moving knife 7 is engaged between the clamp 4 and the second terminal block 22. The clamp 4 is used to squeeze and fix the moving knife 7. In addition, when the pull plate 15 is released, the elastic force of the spring 12 drives the insulating block 13 to move above the moving knife 7, thereby fixing the moving knife 7 and preventing the moving knife 7 from loosening.

[0031] In addition, when the fuse tube 18 blows, first disconnect the switch, then remove the wing screw 20 from the two connecting blocks 19, thereby opening the two arc-shaped covers 17 to take out the damaged fuse tube 18, and install a new fuse tube 18 on the inside of the two arc-shaped bases 16 and the two arc-shaped covers 17. Use the wing screw 20 to fix the two connecting blocks 19, and use the arc-shaped covers 17 and the arc-shaped bases 16 to clamp and fix the fuse tube 18, so as to achieve convenient replacement of the fuse tube 18.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. Low voltage single-phase knife-blade switch comprising an insulator post (1), characterized in that: One end of the insulator post (1) is provided with a first conductive frame (2), and the other end of the insulator post (1) is provided with a second conductive frame (3). A clamp (4) is provided on the second conductive frame (3). A stationary turn blade (5) is rotatably connected to the first conductive frame (2). An insulating turn blade (6) is bolted to the end of the stationary turn blade (5). A movable turn blade (7) is bolted to the end of the insulating turn blade (6). The end of the movable turn blade (7) is in contact with the clamp (4). A support base (9) is fixedly connected to the side of the other end of the insulator post (1). A fixed sleeve is provided with a limiting seat (10). The end of the limiting seat (10) is provided with a telescopic groove (11). A spring (12) is fixedly connected to the inner wall of the telescopic groove (11). An insulating block (13) is fixedly connected to the end of the spring (12). The end of the insulating block (13) is movably sleeved above the end of the moving turn knife (7). The other end of the insulating block (13) is fixedly connected with a pull rod (14). The end of the pull rod (14) is movably sleeved to the outside of the limiting seat (10) and fixedly connected with a pull plate (15). A fusion mechanism (8) is provided between the stationary turn knife (5) and the moving turn knife (7).

2. The low voltage single phase knife switch of claim 1, wherein: The fusion mechanism (8) includes arc-shaped bases (16) fixedly connected to the sides of the stationary cutter (5) and the moving cutter (7), respectively. Arc-shaped covers (17) are hinged to the sides of the two arc-shaped bases (16), and a fusion tube (18) is sleeved between the two arc-shaped bases (16) and the two arc-shaped covers (17). Connecting blocks (19) are provided at the ends of the arc-shaped covers (17) and the arc-shaped bases (16), and wing screws (20) are threaded on each pair of connecting blocks (19).

3. The low voltage single phase knife switch of claim 1, wherein: A first terminal block (21) is bolted onto the first conductive frame (2), and the side of the first terminal block (21) is in contact with the side of the stationary turn knife (5).

4. The low voltage single phase knife switch of claim 1, wherein: A second terminal block (22) is bolted onto the second conductive frame (3), and the side of the second terminal block (22) is in contact with the side of the moving cutter (7).

5. The low-voltage single-phase knife fuse switch according to claim 1, characterized in that: An mounting bracket (24) is bolted onto the insulator post (1), and a pull ring (23) is bolted onto the side of the insulating blade (6).

6. The low voltage single phase knife switch of claim 1, wherein: The inner wall of the expansion groove (11) is in contact with the side of the insulating block (13).

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