A lightning protection drop-out fuse

Abstract

The present invention discloses a lightning protection drop-out type fuse, comprising an insulating support, a connector sleeved under the insulating support, a lower contact plate rotatably connected to one end of the insulating support, the lower contact plate being provided with a lower contact member and a tooth-shaped bracket serving as a guide, an upper contact plate being provided at the other end of the insulating support, the upper contact plate being provided with a wiring terminal, the wiring terminal being connected to a cylindrical dissolving tube via a hanging member, the end of the cylindrical dissolving tube being provided with a lower moving contact, the cylindrical dissolving tube being connected to a reinforcing spring via a sleeve ring, the other end of the reinforcing spring being connected to the insulating support via a ceramic connecting ring. The present invention pulls the cylindrical dissolving tube to stretch the reinforcing spring provided thereon to generate tension, and achieves rapid docking through the elastic force of the spring, which is much faster than the speed of manual docking by an electrician, thereby reducing the time it takes for an arc to be generated, and without the need for manual operation, effectively avoiding harm to personnel when the circuit is connected.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power facilities, and in particular to a lightning protection drop-out type fuse. Background Art

[0002] Dropout fuses are the most commonly used short-circuit protection switches for 10kV distribution line branches and distribution transformers. They are economical, easy to operate, and highly adaptable to outdoor environments. They are widely used on the primary side of 10kV distribution lines and distribution transformers for protection and equipment switching operations. Installed under 10kV distribution line branches, they can reduce the scope of power outages. With a clear disconnect point, they function as disconnectors, creating a safe working environment for maintenance personnel and equipment, enhancing their sense of security. Installed under distribution transformers, they can serve as primary protection for the distribution transformer.

[0003] Fuses are widely used in power distribution lines, but when connecting to power, fuses need to be connected under power. The existing method mainly involves manually and quickly connecting the lower contact of the fuse with the contact piece. Quick connection must be ensured. High-voltage line connection will cause high-voltage breakdown. Improper operation will not only cause the fuse contacts to burn, but also cause injuries to power personnel. In addition, when the fuse is broken, the existing fuse only relies on the elastic force of the metal sheet at the lower moving contact to achieve rapid disconnection. The elastic force of the metal sheet is affected by the external environment. In extremely cold conditions, it is very easy to cause the fuse to be unable to disconnect quickly, causing damage to power equipment. For this reason, a lightning protection drop-out fuse is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a lightning protection drop-out type fuse.

[0005] In order to achieve the following objectives, the present invention adopts the following technical solutions:

[0006] A lightning protection drop-out fuse comprises an insulating support, wherein a connecting piece for connection is sleeved under the insulating support, a lower contact plate is rotatably connected to one end of the insulating support, the lower contact plate is provided with a lower contact piece and a tooth-shaped bracket that serves as a guide, an upper contact plate is provided at the other end of the insulating support, the upper contact plate is provided with a wiring terminal, the wiring terminal is connected to a cylindrical dissolving tube through a suspension piece, a copper wire is provided in the cylindrical dissolving tube, the copper wire is connected to the wiring terminal through a connecting screw, a lower moving contact is provided at the end of the cylindrical dissolving tube, the cylindrical dissolving tube is connected to a reinforcing spring through a sleeve ring, and the other end of the reinforcing spring is connected to the insulating support through a ceramic connecting ring.

[0007] Preferably, the connecting member comprises a U-shaped ceramic member sleeved on the insulating support, and a connecting piece for installation is provided at the end of the ceramic member.

[0008] Preferably, the lower contact member includes a lower static contact fixedly connected to the lower contact plate, and an elastic metal contact piece is provided at the bottom of the lower static contact piece, and the elastic metal contact piece is connected to the lower contact plate through a plurality of metal inclined pieces;

[0009] A "U"-shaped contact block is provided at the bottom of the elastic metal connector, the inner side wall of the "U"-shaped contact block is slidably connected to a limiting column, the limiting column is connected to a metal buffer side piece, and the metal buffer side piece is connected to the inner wall of the "U"-shaped contact block through a resistance spring sleeved under the outer side wall of the limiting column.

[0010] Preferably, the tooth-shaped bracket is composed of an inclined rod, a balance rod and an arc rod that are arranged opposite to each other, and one end of the inclined rod is connected to the bottom of the lower touch plate.

[0011] Preferably, an upper moving contact is provided at the end of the cylindrical dissolving tube, and the hanging member includes a hanging rod connected to the upper moving contact through a rotating shaft, a trigger metal strip is provided under the hanging rod, and a locking hole for the copper wire to pass through is provided on the trigger metal strip, and a fastening screw is threadedly connected to the side wall of the locking hole.

[0012] Preferably, an L-shaped limit block for limiting the movement of the sleeve ring is provided under the outer side wall of the cylindrical dissolving tube, and an operating pull ring is provided on the L-shaped limit block.

[0013] Preferably, a threaded hole is provided under the ceramic connecting ring, a threaded connection post is threadedly connected to the threaded hole, an end of the threaded connection post is connected to a hanging ring through a universal ball, and the hanging ring is connected to one end of the reinforcing spring.

[0014] Preferably, one end of the copper wire is connected to the lower moving contact, and the lower moving contact is connected to the cylindrical dissolving tube through a thread.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. During installation, by pulling the cylindrical dissolving tube, the reinforcing spring provided thereon is stretched to generate tension, and the elastic force of the spring is used to achieve quick docking. The elastic force is much faster than the speed of manual docking by electric workers, thereby reducing the time of arc generation and eliminating the need for manual operation, which can effectively avoid damage to personnel when the circuit is connected.

[0017] 2. Strengthening the remaining elastic force of the spring will ensure the effective connection between the lower moving contact on the cylindrical dissolving tube and the lower contact plate, and when the copper wire melts, the cylindrical dissolving tube and the terminal can be quickly and effectively disconnected by the elastic force, thereby ensuring that it falls quickly when it melts and effectively avoids secondary contact, which is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a structural diagram of a lightning protection drop-out fuse proposed by the present invention;

[0019] Figure 2 This is a structural schematic diagram of an insulating column component in a lightning protection drop-out fuse proposed by the present invention;

[0020] Figure 3 This is a structural schematic diagram of a cylindrical dissolving tube in a lightning protection drop-out fuse proposed by the present invention.

[0021] In the figure: 1 insulating pillar, 2 lower contact plate, 3 upper contact plate, 4 wiring terminal, 5 cylindrical dissolving tube, 6 connecting screw, 7 lower moving contact, 8 sleeve ring, 9 strengthening spring, 10 ceramic connecting ring, 11 ceramic part, 12 lower static contact, 13 elastic metal contact piece, 14 "U"-shaped contact block, 15 limit column, 16 metal buffer side piece, 17 tilt rod, 18 arc rod, 19 upper moving contact, 20 hanging rod, 21 trigger metal strip, 22 fastening screw, 23 L-shaped limit block, 24 operating pull ring, 25 threaded column, 26 hanging ring, 27 copper wire. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "lower," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean 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, and it can be internal communication between two components. Those skilled in the art will understand the specific meanings of the following terms in the present invention in specific circumstances.

[0025] Reference Figure 1-3A lightning protection drop-out fuse includes an insulating support 1, a connector for connection is provided under the insulating support 1, and the connector includes a U-shaped ceramic part 11 provided on the insulating support 1, and a connecting piece for installation is provided at the end of the ceramic part 11.

[0026] One end of the insulating support 1 is rotatably connected to the lower contact plate 2, and the lower contact plate 2 is provided with a lower contact piece and a tooth-shaped bracket that serves as a guide. Furthermore, the lower contact piece includes a lower static contact 12 fixedly connected to the lower contact plate 2, and an elastic metal contact 13 is provided at the bottom of the lower static contact 12. The elastic metal contact 13 is connected to the lower contact plate 2 through a plurality of metal inclined parts; a "U"-shaped contact block 14 is provided at the bottom of the elastic metal contact 13, and the inner side wall of the "U"-shaped contact block 14 is slidably connected to the limiting column 15. The limit column 15 is connected to a metal buffer side piece 16, and the metal buffer side piece 16 is connected to the inner wall of the "U"-shaped contact block 14 through a resistance spring sleeved under the outer wall of the limit column 15; further, the tooth-shaped bracket is composed of an oppositely arranged tilting rod 17, a balance rod and an arc rod 18. One end of the tilting rod 17 is connected to the bottom of the lower touch plate 2. The tooth-shaped bracket can guide the cylindrical dissolving tube 5 to ensure that the lower moving contact 7 on the cylindrical dissolving tube 5 can accurately dock with the "U"-shaped contact block 14.

[0027] An upper touch plate 3 is provided at the other end of the insulating pillar 1, and the upper touch plate 3 is provided with a wiring terminal 4. The wiring terminal 4 is connected to a cylindrical dissolving tube 5 through a hanging member. Furthermore, an upper moving contact 19 is provided at the end of the cylindrical dissolving tube 5. The hanging member includes a hanging rod 20 connected to the upper moving contact 19 through a rotating shaft. A trigger metal strip 21 is provided under the hanging rod 20. The trigger metal strip 21 is elastic and can quickly detach the hook 20 when the copper wire breaks. A locking hole for the copper wire 27 to pass through is opened on the trigger metal strip 21, and a fastening screw 22 is threadedly connected to the side wall of the locking hole.

[0028] A copper wire 27 is provided in the cylindrical dissolving tube 5, and the copper wire 27 is connected to the terminal 4 through a connecting screw 6. Furthermore, one end of the copper wire 27 is connected to the lower moving contact 7, and the lower moving contact 7 is connected to the cylindrical dissolving tube 5 through a threaded connection. The specific connection method of the copper wire 27 is a common technology for fuses and will not be described in detail here.

[0029] A lower moving contact 7 is provided at the end of the cylindrical dissolving tube 5, and the cylindrical dissolving tube 5 is connected to a reinforcing spring 9 through a sleeve ring 8. The reinforcing spring 9 is made of insulating polymer material. The other end of the reinforcing spring 9 is connected to the insulating pillar 1 through a ceramic connecting ring 10. An L-shaped limit block 23 for limiting the movement of the sleeve ring 8 is provided under the outer wall of the cylindrical dissolving tube 5. An operating pull ring 24 is provided on the L-shaped limit block 23. A threaded hole is provided under the ceramic connecting ring 10. The threaded hole is threadedly connected to a threaded column 25. The end of the threaded column 25 is connected to a hanging ring 26 through a universal ball. The universal ball realizes connection, which can ensure that when the connection is achieved by rotating the threaded column 25, the state of the reinforcing spring 9 is not affected. The hanging ring 26 is connected to one end of the reinforcing spring 9.

[0030] During assembly, the copper wire 27 is first connected to the upper moving contact 19 threadedly connected to the cylindrical dissolving tube 5. The other end of the copper wire 27 extends outward through the cylindrical dissolving tube 5 and passes through the locking hole provided on the trigger metal strip 21. The copper wire 27 is tightened and straightened by tightening the screw 22. Under the action of the tension of the copper wire 27, the trigger metal strip 21 is restricted to the end of the cylindrical dissolving tube 5. At this time, the end of the copper wire 27 is connected to the terminal 4 through the connecting screw 6, and then the hanging rod 20 at the bottom is suspended from the terminal 4.

[0031] When the connection to the top is completed, it is necessary to electrically connect the lower moving contact 7 at the bottom with the lower static contact 12. At this time, live operation is required. To ensure the safety of the electrician, the sleeve ring 8 at one end of the reinforcing spring 9 can be sleeved on the cylindrical dissolving tube 5, and the threaded connection column 25 connected to the other end of the reinforcing spring 9 is docked with the threaded hole on the ceramic connection ring 10 to achieve tightening, so that the reinforcing spring 9 is always in a stretched state. When it is necessary to electrically connect, the cylindrical dissolving tube 5 is pulled outward by pulling the operating pull ring, so that the reinforcing spring 9 connected to the cylindrical dissolving tube 5 is deformed more. When the limit is reached, the hand is released. Under the action of the elastic force of the reinforcing spring 9, the cylindrical dissolving tube 5 will rebound quickly, and the lower moving contact 7 set at the end of the cylindrical dissolving tube 5 will enter the "U"-shaped contact block 14 under the action of the tooth-shaped bracket, so that the current is connected. Its rebound force is much faster than the speed of manual docking by the electrician, thereby reducing the time of arc generation and eliminating the need for manual operation, which can effectively avoid harm to personnel when the circuit is connected.

[0032] When the copper wire 27 located therein is melted during use, the trigger metal strip 21 tightened by the copper wire 27 will quickly separate from the end of the cylindrical dissolving tube 5 due to the disconnection of the copper wire 27, thereby causing the hanging rod 20 to quickly separate from the terminal 4. When separating, under the strong elastic force of the reinforcing spring 9, the cylindrical dissolving tube 5 will rotate with the upper moving contact 19 as the center, so that the upper contact position of the cylindrical dissolving tube 5 is away from the terminal 4, which can ensure that it falls quickly when the fuse is blown and effectively avoids secondary contact, making it safer and more reliable.

[0033] The following description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A lightning protection drop-out fuse, comprising an insulating support (1), characterized in that: The insulating support (1) is provided with a connecting piece for connection at the bottom sleeve, one end of the insulating support (1) is rotatably connected to a lower touch plate (2), the lower touch plate (2) is provided with a lower contact piece and a tooth-shaped bracket for guiding, the other end of the insulating support (1) is provided with an upper touch plate (3), the upper touch plate (3) is provided with a wiring terminal (4), the wiring terminal (4) is connected to a columnar melting tube (5) through a hanging piece, a copper wire (27) is provided in the columnar melting tube (5), the copper wire (27) and the wiring terminal (4) are connected by a connecting screw (6), a lower moving contact (7) is provided at the end of the columnar melting tube (5), the columnar melting tube (5) is connected to a reinforcing spring (9) through a sleeve ring (8), and the other end of the reinforcing spring (9) is connected to the insulating support (1) through a ceramic connecting ring (10); The lower contact member comprises a lower static contact (12) fixedly connected to the lower contact plate (2), a top of the lower static contact (12) is provided with an elastic metal contact piece (13), and the elastic metal contact piece (13) is connected to the lower contact plate (2) via a plurality of metal inclined pieces; A "U"-shaped contact block (14) is provided on the top of the elastic metal connecting piece (13); the inner side wall of the "U"-shaped contact block (14) is slidably connected to a limiting column (15); the limiting column (15) is connected to a metal buffer side piece (16); the metal buffer side piece (16) is connected to the inner wall of the "U"-shaped contact block (14) via a resisting spring sleeved on the outer side wall of the limiting column (15); The tooth-shaped bracket is composed of an inclined rod (17), a balance rod and an arc rod (18) arranged opposite to each other, and one end of the inclined rod (17) is connected to the top of the lower touch plate (2); An upper moving contact (19) is provided at the end of the cylindrical melting tube (5), and the hanging member includes a hanging rod (20) connected to the upper moving contact (19) via a rotating shaft, and a trigger metal strip (21) is provided on the hanging rod (20), and a locking hole for a copper wire (27) to pass through is opened on the trigger metal strip (21), and a fastening screw (22) is threadedly connected to the side wall of the locking hole.

2. A lightning protection drop-out fuse according to claim 1, characterized in that: The connecting piece comprises a U-shaped ceramic piece (11) sleeved on the insulating support (1), and a connecting piece for installation is provided at the end of the ceramic piece (11).

3. The lightning protection drop-out fuse according to claim 1, characterized in that: An L-shaped limit block (23) for limiting the movement of the sleeve ring (8) is provided on the outer side wall of the cylindrical melting tube (5), and an operating pull ring (24) is provided on the L-shaped limit block (23).

4. The lightning protection drop-out fuse according to claim 1, characterized in that: The ceramic connecting ring (10) is provided with a threaded hole, the threaded hole is threadedly connected to a threaded connecting post (25), the end of the threaded connecting post (25) is connected to a hanging ring (26) through a universal ball, and the hanging ring (26) is connected to one end of the reinforcing spring (9).

5. The lightning protection drop-out fuse according to claim 1, characterized in that: One end of the copper wire (27) is connected to the lower moving contact (7), and the lower moving contact (7) is connected to the cylindrical melting tube (5) through a thread.

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