An AC outdoor high-voltage drop-out fuse

Abstract

An AC outdoor high-voltage drop-out fuse of the present invention comprises: an arc-extinguishing tube, an upper contact assembly, a lower contact assembly and an insulator; the upper contact assembly comprises an upper static contact, a static contact guard plate, a reset spring, an upper moving contact and an upper moving contact seat, the upper static contact is connected to the static contact guard plate by a spring, and the rear end of the static contact guard plate, the rear end of the upper static contact and the upper end of the insulator are connected by bolts; the top of the upper moving contact is spherical, the bottom surface of the upper static contact is provided with a spherical groove, the bottom of the upper moving contact is connected to the upper moving contact seat by a thread, and the bottom of the upper moving contact seat is provided with a groove; the top of the arc-extinguishing tube is covered with a segmented disengagement contact, the top of the segmented disengagement contact is provided with a boss, which is plugged into the groove at the bottom of the upper moving contact seat through the boss; one end of the fuse is installed into the arc-extinguishing tube from the upper moving contact seat and is pressed by the upper moving contact, and the other end passes through the bottom of the arc-extinguishing tube and is connected to the lower contact assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of fuses and relates to an AC outdoor high-voltage drop-out fuse. Background Art

[0002] Drop-out fuses are commonly used in outdoor overhead power distribution systems to protect lines or power transformers from overload and short-circuit. After normal operation, the fuse carrier drops, creating a visible fracture that ensures safety during maintenance and inspection. Existing drop-out fuses can erode due to the high current impact and poor contact when equipment fails and overcurrent occurs. This can cause the upper moving contact and upper static contact to stick together, leading to further equipment failure and losses. Therefore, there is an urgent need for a drop-out fuse that can ensure the fuse carrier drops normally when equipment fails and overcurrent occurs, thereby protecting the equipment in the circuit. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide an outdoor high-voltage drop-out fuse, which can ensure that the fuse carrier drops normally when an equipment failure occurs and an overcurrent occurs, thereby protecting the equipment in the line.

[0004] The present invention provides an AC outdoor high-voltage drop-out fuse, comprising: an arc-extinguishing tube, an upper contact assembly arranged at the upper end of the arc-extinguishing tube, a lower contact assembly arranged at the lower end of the arc-extinguishing tube, and an insulator connecting the upper contact assembly and the lower contact assembly;

[0005] The upper contact assembly includes: an upper static contact, a static contact guard plate, a return spring, an upper moving contact, an upper moving contact seat and a segmented disengagement contact; the front end of the upper static contact is connected to the front end of the static contact guard plate by a return spring, and the rear end of the static contact guard plate, the rear end of the upper static contact and the upper end of the insulator are connected by bolts; the top of the upper moving contact is spherical, the bottom surface of the upper static contact is provided with a spherical groove, the upper moving contact is positioned and matched with the spherical groove, the bottom of the upper moving contact is connected to the upper moving contact seat by a thread, and the bottom of the upper moving contact seat is provided with a groove; the segmented disengagement contact sleeve is arranged on the top of the arc-extinguishing tube, the top of the segmented disengagement contact is provided with a boss, which is plugged into the groove at the bottom of the upper moving contact seat through the boss; one end of the fuse is installed into the arc-extinguishing tube from the upper moving contact seat and presses the fuse cap through the upper moving contact, and the other end passes through the bottom of the arc-extinguishing tube and is connected to the lower contact assembly.

[0006] In the AC outdoor high-voltage drop-out fuse of the present invention, the lower contact assembly includes: a lower bracket, a lower movable contact, a lower support and a fuse spring;

[0007] The lower support is provided with a connecting part and a supporting part, and the connecting part is connected to the lower end of the insulator by bolts, and the supporting part is composed of two supporting claws bent upwards; the lower bracket is sleeved on the bottom of the arc-extinguishing tube; the lower movable contact is provided with a hinge part, a fuse fixing part, a connecting shaft and a main frame, and the lower movable contact is hinged to the lower bracket through the hinge part, and the hinge part is arranged at the top of the main frame, and the two ends of the connecting shaft are passed through the two opposite side walls of the main frame, and a torsion spring is provided on the connecting shaft, and one end of the fuse spring is provided with two connecting ears, and the fuse spring is sleeved on the connecting shaft through the two connecting ears, and the two connecting ears are respectively connected to the two ends of the torsion spring; the two ends of the connecting shaft extend from the side walls of the main frame and overlap on the corresponding supporting claws; the fuse fixing part is located at the rear of the main frame, and the fuse presses the fuse spring after passing through the bottom of the arc-extinguishing tube and then fixes it to the fuse fixing part by screws.

[0008] In the AC outdoor high-voltage drop-out fuse of the present invention, the upper contact assembly also includes a static contact bracket, the rear end of the static contact bracket is connected to the rear end of the static contact guard plate, the rear end of the upper static contact and the upper end of the insulator by bolts, and the static contact bracket is arranged below the upper static contact.

[0009] In the AC outdoor high-voltage drop-out fuse of the present invention, the rear ends of the static contact guard plate and the upper static contact are bent upward to form an upper terminal, and the connecting portion of the lower support is connected to the lower terminal by bolts.

[0010] In the AC outdoor high-voltage drop-out fuse of the present invention, the insulator is a large creepage distance high-strength porcelain insulator or a composite silicone rubber insulator.

[0011] In the AC outdoor high-voltage drop-out fuse of the present invention, the arc-extinguishing tube is made of epoxy glass fiber and steel paper, and the outside of the arc-extinguishing tube is coated with anti-ultraviolet insulation paint.

[0012] In the AC outdoor high-voltage drop-out fuse of the present invention, the upper static contact, the upper moving contact, the lower movable contact and the lower wiring terminal are all processed by silver plating.

[0013] The outdoor high-voltage drop-out fuse of the present invention has at least the following beneficial effects:

[0014] The AC outdoor high-voltage drop-out fuse of this invention features a segmented, two-section moving contact structure in its upper contact assembly. The upper moving contact holder and the segmented disconnecting contacts utilize a copper casting slot-type insert structure. During operation, the self-locking properties of the fuse wire and torsion spring connect the segments. In the event of an equipment failure and overcurrent, if the upper moving contact and upper static contact become attached, the upper moving contact holder and segmented disconnecting contacts can cause a secondary drop, ensuring the fuse's proper drop and protecting equipment in the circuit.

[0015] 2. The AC outdoor high-voltage drop-out fuse of the present invention adopts the arc extinguishing principle of combining self-generated gas longitudinal arc blowing with strong arc pulling of torsion spring; the arc extinguishing tube adopts a single-end exhaust structure, which effectively prevents the breaking arc from damaging the lines or equipment above the fuse while ensuring reliable interruption of current from overload to short-circuit fault.

[0016] 3. The top of the upper moving contact adopts a spherical structure, which can be positioned and matched with the spherical groove on the bottom of the static contact, with good contact performance. The upper static contact exerts positive pressure on the upper moving contact, effectively ensuring good conductive contact and reliable falling of the arc extinguishing tube after breaking. During the current breaking process, the upper moving contact has a certain sliding delay, which ensures that the arc is extinguished in the arc extinguishing tube, preventing the upper moving contact from arcing and burning.

[0017] 4. The high-voltage drop-out fuse of the present invention can use high-strength porcelain insulators with large creepage distance. The strong bending strength and impact resistance ensure the drop-out breaking performance and operational reliability. It can also use composite silicone rubber insulators, which have the characteristics of being hydrophobic, self-cleaning, UV-resistant, and not affected by climate corrosion.

[0018] 5. The arc extinguishing tube is made of epoxy glass fiber and steel paper composite, which fully guarantees the rated explosion-proof ability and small current breaking capacity of the arc extinguishing tube; the arc extinguishing tube is coated with anti-ultraviolet insulating paint, which effectively increases the service life of the tube assembly.

[0019] 6. All metal parts are standard parts, precision castings or stampings, which improves the standardization of products and ensures the uniformity and interchangeability of products and parts.

[0020] 7. The upper static contact, upper moving contact, lower movable contact and lower terminal are all silver-plated to improve the reliability of electrical contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of an AC outdoor high-voltage drop-out fuse of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the lower support of the present invention;

[0023] Figures 3a-3d 3a is a perspective view, 3b is a front view, 3c is a left view, and 3d is a right view;

[0024] Figure 4 is a schematic diagram of a fuse spring of the present invention;

[0025] Among them: 1-upper moving contact, 2-upper static contact, 3-static contact guard plate, 4-static contact bracket, 5-upper terminal, 6-reset spring, 7-upper moving contact seat, 71-operating ring, 8-segmented disengagement contact, 9-fuse spring, 10-arc extinguishing tube, 11-lower bracket, 12-lower movable contact, 121-hinge part, 122-fuse fixing part, 123-connecting shaft, 124-main frame, 125-torsion spring, 13-lower support, 131-connecting part, 132-support part, 14-lower terminal, 15-insulator. DETAILED DESCRIPTION

[0026] like Figure 1 As shown, an AC outdoor high-voltage drop-out fuse of the present invention includes: an arc-extinguishing tube 10, an upper contact assembly provided at the upper end of the arc-extinguishing tube 10, a lower contact assembly provided at the lower end of the arc-extinguishing tube, and an insulator 15 connecting the upper contact assembly and the lower contact assembly.

[0027] The upper contact assembly includes: an upper static contact 2, a static contact guard plate 3, a return spring 6, an upper moving contact 1, an upper moving contact seat 7 and a segmented disengagement contact 8. The front end of the upper static contact 2 is connected to the front end of the static contact guard plate 3 by the return spring 6, and the rear end of the static contact guard plate 3, the rear end of the upper static contact 2 and the upper end of the insulator 15 are connected by bolts. The top of the upper moving contact 1 is spherical, and the bottom surface of the upper static contact 2 is provided with a spherical groove, and the upper moving contact is positioned and matched with the spherical groove. The bottom of the upper moving contact 1 is connected to the upper moving contact seat 7 by threads, and the bottom of the upper moving contact seat 7 is provided with a groove. The segmented disengagement contact 8 is sleeved on the top of the arc extinguishing tube 10, and the top of the segmented disengagement contact 8 is provided with a boss, which is plugged into the groove at the bottom of the upper moving contact seat 7 through the boss. One end of the fuse is installed into the arc extinguishing tube 10 from the upper moving contact seat 7 and pressed against the fuse cap through the upper moving contact 1, and the other end passes through the bottom of the arc extinguishing tube 10 and is connected to the lower contact assembly.

[0028] The lower contact assembly includes: a lower bracket 11 , a lower movable contact 12 , a lower support 13 and a fuse spring 9 .

[0029] like Figure 2 As shown, the lower support 13 is provided with a connecting portion 131 and a supporting portion 132. The connecting portion 131 is connected to the lower end of the insulator 15 by bolts, and the supporting portion 132 is composed of two upwardly bent supporting claws. The lower support 11 is sleeved on the bottom of the arc-extinguishing tube 10.

[0030] like Figures 3a-3d and Figure 4As shown, the lower movable contact 12 is provided with a hinged portion 121, a fuse fixing portion 122, a connecting shaft 123, and a main frame 124. The lower movable contact 12 is hingedly connected to the lower bracket 11 via the hinged portion 121, which is located at the top of the main frame 124. The ends of the connecting shaft 123 are inserted into two opposing side walls of the main frame 124. A torsion spring 125 is provided on the connecting shaft 123. One end of the fuse spring 9 is provided with two connecting ears 91. The fuse spring 9 is mounted on the connecting shaft 123 via the two connecting ears 91, and the two connecting ears 91 are respectively connected to the ends of the torsion spring 125. The ends of the connecting shaft 123 extend from the side walls of the main frame 124 and overlap the corresponding support claws of the support portion 132. The fuse fixing portion 122 is located at the rear of the main frame 124. After the fuse passes through the bottom of the arc-extinguishing tube 10, it presses against the fuse spring 9 and is then fixed to the fuse fixing portion 122 via screws.

[0031] In specific implementation, the upper contact assembly also includes a static contact bracket 4, the rear end of the static contact bracket 4 is connected to the rear end of the static contact guard plate 3, the rear end of the upper static contact 2 and the upper end of the insulator 15 by bolts, and the static contact bracket 4 is arranged below the upper static contact 2.

[0032] In a specific implementation, the rear ends of the static contact shield 3 and the upper static contact 2 are bent upward to form the upper wiring terminal 5, and the connecting portion 131 of the lower support 13 is connected to the lower wiring terminal 14 by bolts.

[0033] In practice, the insulator 15 can be a high-strength porcelain insulator with a large creepage distance. Its strong bending strength and impact resistance ensure drop-out breaking performance and operational reliability. Alternatively, a composite silicone rubber insulator can be used, which is hydrophobic, self-cleaning, UV-resistant, and weather-resistant.

[0034] In practice, the arc-extinguishing tube is constructed from a composite of epoxy glass fibers and steel paper, fully guaranteeing both the rated explosion-proof capability and low-current interrupting capability of the arc-extinguishing tube 10. The arc-extinguishing tube 10 is coated with UV-resistant insulating varnish, effectively extending the service life of the tube assembly.

[0035] In a specific implementation, the upper static contact 2, the upper movable contact 1, the lower movable contact 12 and the lower terminal 14 are all silver-plated, thereby improving the reliability of the electrical contact.

[0036] Specific operation process and principle:

[0037] When installing a fuse in a fuse box, one end of the fuse is installed into the arc extinguishing tube 10 from the upper movable contact seat 7 and the fuse cap is pressed against the upper movable contact 1. The fuse is then straightened and passed through the bottom of the arc extinguishing tube 10 to press against the fuse spring 9, which is then fixed to the fuse fixing part by screws. This places the fuse spring 9 in the energy storage position, and the lower movable contact 12 is locked by the fuse spring 9, thereby being at the maximum distance from the upper movable contact.

[0038] When the drop-out fuse is closed, the upper moving contact 1 squeezes the upper static contact 2, forcing the return spring 6 at the upper end of the upper static contact 2 to deform and exert a certain pressure on the upper moving contact 1. Under the action of pressure, the upper moving contact 1 and the upper static contact 2 will fully contact, so that the fuse remains in the closed working state.

[0039] When there is a fault current such as overload or short circuit, the fuse blows, and the fuse spring 9 at the lower movable contact 12 pulls out the fuse under the action of the torsion spring potential energy. The action of the fuse spring 9 will cause the lower movable contact 12 to lose the holding force at the longest distance with the upper movable contact 1. Under the action of its own gravity and the pressure of the upper static contact 2, the upper movable contact 1 and the arc extinguishing tube 10 will quickly fall and disconnect, forming a clear disconnection point.

[0040] When a device fails and generates overcurrent, if the upper moving contact 1 and the upper static contact 2 stick together, the upper moving contact seat 7 and the segmented disengagement contact 8 that are plugged into each other can achieve a secondary drop, ensuring the normal drop of the fuse and thus protecting the equipment in the line.

[0041] When performing the opening operation, it is only necessary to use the insulating pull rod to cover the operating ring 71 on the fuse, and pull it downward with force along the direction of the downward rotation of the lower movable contact 12 until the arc extinguishing tube is in a naturally falling and hanging state.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the concept of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An AC outdoor high-voltage drop-out fuse, characterized in that: include: An arc-extinguishing tube, an upper contact assembly provided at the upper end of the arc-extinguishing tube, a lower contact assembly provided at the lower end of the arc-extinguishing tube, and an insulator connecting the upper contact assembly and the lower contact assembly; The upper contact assembly comprises: an upper static contact, a static contact guard plate, a return spring, an upper moving contact, an upper moving contact seat and a segmented disengagement contact; the front end of the upper static contact is connected to the front end of the static contact guard plate by a return spring, and the rear end of the static contact guard plate, the rear end of the upper static contact and the upper end of the insulator are connected by bolts; the top of the upper moving contact is spherical, the bottom surface of the upper static contact is provided with a spherical groove, the upper moving contact is positioned and matched with the spherical groove, the bottom of the upper moving contact is connected to the upper moving contact seat by a thread, and the bottom of the upper moving contact seat is provided with a groove; the segmented disengagement contact sleeve is arranged on the top of the arc-extinguishing tube, the top of the segmented disengagement contact is provided with a boss, which is plugged into the groove at the bottom of the upper moving contact seat through the boss; one end of the fuse is installed into the arc-extinguishing tube from the upper moving contact seat and presses the fuse cap through the upper moving contact, and the other end passes through the bottom of the arc-extinguishing tube and is connected to the lower contact assembly; The arc-extinguishing tube is made of epoxy glass fiber and steel paper, and the arc-extinguishing tube is coated with anti-ultraviolet insulation paint; The upper static contact, the upper moving contact, the lower movable contact and the lower wiring terminal are all processed by silver plating technology.

2. The AC outdoor high-voltage drop-out fuse according to claim 1, characterized in that: The lower contact assembly includes: a lower bracket, a lower movable contact, a lower support and a fuse spring; The lower support is provided with a connecting part and a supporting part, and the connecting part is connected to the lower end of the insulator by bolts, and the supporting part is composed of two supporting claws bent upwards; the lower bracket is sleeved on the bottom of the arc-extinguishing tube; the lower movable contact is provided with a hinge part, a fuse fixing part, a connecting shaft and a main frame, and the lower movable contact is hinged to the lower bracket through the hinge part, and the hinge part is arranged at the top of the main frame, and the two ends of the connecting shaft are passed through the two opposite side walls of the main frame, and a torsion spring is provided on the connecting shaft, and one end of the fuse spring is provided with two connecting ears, and the fuse spring is sleeved on the connecting shaft through the two connecting ears, and the two connecting ears are respectively connected to the two ends of the torsion spring; the two ends of the connecting shaft extend from the side walls of the main frame and overlap on the corresponding supporting claws; the fuse fixing part is located at the rear of the main frame, and the fuse presses the fuse spring after passing through the bottom of the arc-extinguishing tube and then fixes it to the fuse fixing part by screws.

3. The AC outdoor high-voltage drop-out fuse according to claim 1, characterized in that: The upper contact assembly also includes a static contact bracket, the rear end of which is connected to the rear end of the static contact guard plate, the rear end of the upper static contact and the upper end of the insulator by bolts, and the static contact bracket is arranged below the upper static contact.

4. The AC outdoor high-voltage drop-out fuse according to claim 2, characterized in that: The rear ends of the static contact guard plate and the upper static contact are bent upward to form an upper wiring terminal, and the connecting portion of the lower support is connected to the lower wiring terminal through a bolt.

5. The AC outdoor high-voltage drop-out fuse according to claim 1, characterized in that: The insulator is a high-strength porcelain insulator with a large creepage distance or a composite silicone rubber insulator.

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