Surge arrester and fuse combination system

Abstract

This invention discloses a surge arrester and fuse combination system, relating to the technical field of power transmission and distribution protection equipment. It includes a fuse body and an insulator body. A fixing sleeve is provided on the outside of the insulator body, and a receiving cavity is provided inside the insulator body. A first connecting component is provided at the top of the receiving cavity, connecting to the fixing sleeve. The surge arrester body is also disposed within the receiving cavity. A second connecting component is provided at the top of the surge arrester body, and the second connecting component is adapted to the first connecting component. A first hooking component is provided at the bottom of the surge arrester body, and a second hooking component is provided at the bottom of the insulator body, adapted to the first hooking component. This invention employs the above-mentioned surge arrester and fuse combination system, where the fuse body and the surge arrester body share the same insulator body. Two sets of protection equipment can be connected in a single installation, significantly reducing on-site construction steps.

Description

Technical Field

[0001] This invention relates to the field of power transmission and distribution protection equipment technology, and in particular to a surge arrester and fuse combination system. Background Technology

[0002] In existing power distribution lines, surge arresters and fuses are mostly installed separately, requiring separate fixing and wiring, resulting in cumbersome installation procedures and high maintenance costs. Conventional surge arresters are prone to falling directly after failure, posing safety hazards such as damaging power lines and injuring people. Furthermore, traditional overheat disconnection structures often use magnetic or fusible supports, which suffer from insufficient support stability, susceptibility to malfunction in high-temperature environments, and non-reusability. Therefore, this invention provides an integrated, reliable, fall-proof, precisely overheat-disconnected, and easy-to-install combined protection system. Summary of the Invention

[0003] The purpose of this invention is to provide a combination system of surge arrester and fuse to solve the problems existing in the background art.

[0004] To achieve the above objectives, the present invention provides a surge arrester and fuse combination system, including a fuse body and an insulator body. A fixing sleeve is provided on the outside of the insulator body, and a receiving cavity is provided inside the insulator body. A first connecting component is provided at the top of the receiving cavity, and the first connecting component is connected to the fixing sleeve. The surge arrester body is also provided inside the receiving cavity. The top of the surge arrester body is provided with a second connecting component, which is adapted to the first connecting component; The bottom of the surge arrester body is provided with a first hooking component, and the bottom of the insulator body is provided with a second hooking component, the second hooking component and the first hooking component being compatible.

[0005] Preferably, the first connecting component includes a fixing base, the fixing base and the fixing sleeve are connected by a fastener, the lower end of the fixing base is provided with a connecting ring, the inner sidewall of the connecting ring is provided with a plurality of arc-shaped slots, and the surface of the arc-shaped slots is provided with a contact layer.

[0006] Preferably, the second connection component includes a connecting sleeve disposed at the top of the surge arrester body, and the connecting sleeve has a plurality of protruding holes; The connecting sleeve has an inner core inside, and a plurality of elastic locking units are provided between the inner core and the connecting sleeve. One end of the elastic locking unit is connected to the inner core, and the other end of the elastic locking unit extends out of the protrusion hole.

[0007] Preferably, the elastic locking unit includes a connecting rod connected to the inner core, a sliding sleeve is provided on the outside of the connecting rod, an elastic element is provided inside the sliding sleeve, one end of the elastic element is connected to the inner wall of the sliding sleeve, and the other end of the elastic element is connected to the connecting rod; The sliding sleeve is connected to the ball seat, and the ball seat is provided with a locking ball, which is disposed in the protrusion hole.

[0008] Preferably, the locking ball is made of a fusible alloy, and the locking ball is compatible with the contact layer.

[0009] Preferably, the first hooking component includes a hooking part disposed at the bottom end of the surge arrester body, a connecting edge is sleeved on the outside of the hooking part, a connecting groove is opened at the bottom of the connecting edge, and through grooves are symmetrically arranged on both sides of the connecting edge.

[0010] Preferably, the second hooking assembly includes an extension portion disposed at the bottom end of the insulator body, two connecting arms symmetrically disposed on both sides of the extension portion, a hook plate hinged to the bottom end of the connecting arm, and the end of the hook plate being configured as an arc-shaped structure.

[0011] Preferably, a conductive contact surface is provided at the connection between the insulator body and the extension, and a conductive contact ring is provided on the surge arrester body, the conductive contact ring being in contact with the conductive contact surface.

[0012] Preferably, the top end of the fuse body is connected to the top end of the insulator body via a first connector, and the bottom end of the fuse body is connected to the bottom end of the insulator body via a second connector.

[0013] Preferably, an external connector is fixedly connected to the fixing sleeve.

[0014] Therefore, the present invention employs the above-mentioned combination system of surge arrester and fuse, which has the following beneficial effects: (1) The fuse body and the surge arrester body of this system share the same insulator body, and the two sets of protection equipment can be connected in one installation, which greatly reduces the on-site construction steps.

[0015] (2) The system uses a locking ball made of low melting point alloy material of 120℃~140℃, which is not affected by the high temperature of the environment. It only operates when the arrester body itself is overheated due to fault, and does not disconnect accidentally.

[0016] (3) The hook plate of this system can be avoided when it is facing upward and blocked when it is facing downward, so that the lightning arrester body can only enter and not exit, thus fundamentally eliminating the risk of falling from a height.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an embodiment of a surge arrester and fuse combination system according to the present invention; Figure 2 This is a schematic diagram of the internal partial structure of the insulator body of a surge arrester and fuse combination system according to the present invention; Figure 3 This is a schematic diagram of the structure of the first connection component of a surge arrester and fuse combination system according to the present invention; Figure 4 This is a top sectional view of the second connection component of a surge arrester and fuse combination system according to the present invention; Figure 5 This is a schematic diagram of the structure of an elastic locking unit in a surge arrester and fuse combination system according to the present invention; Figure 6 This is a cross-sectional view of the elastic locking unit of a surge arrester and fuse combination system according to the present invention; Figure 7 This is a schematic diagram of the connection edge of a surge arrester and fuse combination system according to the present invention; Reference numerals: 1. Fuse body; 2. Insulator body; 21. Receiving cavity; 3. Fixing sleeve; 31. External connector; 41. Fixing base; 42. Fixing member; 43. Connecting ring; 44. Arc-shaped groove; 45. Contact layer; 5. Second connecting assembly; 51. Connecting sleeve; 52. Protruding hole; 53. Inner core; 54. Elastic locking unit; 541. Connecting rod; 542. Sliding sleeve; 543. Elastic element; 544. Ball seat; 545. Engaging ball; 61. Conductive contact surface; 62. Conductive contact ring; 7. First hooking assembly; 71. Hooking part; 72. Connecting edge; 73. Through groove; 8. Second hooking assembly; 81. Extension part; 82. Connecting arm; 83. Hook plate; 91. First connector; 92. Second connector; 10. Surge arrester body. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] Example Please see Figures 1-7 This invention provides a surge arrester and fuse combination system, including a fuse body 1 and an insulator body 2. The insulator body 2 is an insulating cylindrical structure, integrally molded from high-temperature vulcanized silicone rubber or epoxy glass fiber reinforced composite material, possessing excellent insulation performance, mechanical strength, UV resistance, and anti-pollution flashover performance. A fixing sleeve 3 is provided on the outside of the insulator body 2. The fixing sleeve 3 is a high-strength metal conductive sleeve that is tightly fitted and fixed to the outer wall of the insulator body 2. An external connector 31 is fixedly connected to the fixing sleeve 3. The external connector 31 is used for fixing to the tower crossarm and also serves as the grounding lead of the surge arrester body 10. An accommodating cavity 21 is provided inside the insulator body 2. The accommodating cavity 21 is a cylindrical cavity closed at the top and open at the bottom, used to install the surge arrester body 10.

[0022] The top of the fuse body 1 is connected and electrically connected to the top of the insulator body 2 via a first connector 91, and the bottom of the fuse body 1 is connected and electrically connected to the bottom of the insulator body 2 via a second connector 92. Specifically, at the top connection, the top of the insulator body 2 has an integrally formed upper terminal, which is a metal conductive terminal with bolt holes on its surface. The upper end of the fuse body 1 also has an integrally formed upper conductive connector, which also has bolt holes. The first connector 91 is a locking assembly consisting of a high-strength bolt, a flat washer, a spring washer, and a nut. During installation, the upper terminal and the upper conductive connector are aligned and fitted together, the bolt is inserted, the flat washer and the spring washer are installed, and the nut is tightened to rigidly fix them and ensure tight electrical conduction. Specifically, at the bottom connection, the extension 81 at the bottom of the insulator body 2 has an integrally formed lower terminal, which is a metal conductive terminal. The lower end of the fuse body 1 has an integrally formed lower conductive connector. The second connector 92 is also a locking assembly consisting of a bolt, a flat washer, a spring washer, and a nut. During installation, align and fit the lower terminal block with the lower conductive connector, insert the bolts and tighten them to achieve rigid fixation and electrical continuity. After connection, the fuse body 1 and the insulator body 2 are arranged in an inclined symmetrical manner, resulting in a stable center of gravity, uniform force distribution, and no stress concentration, making it suitable for long-term outdoor operation.

[0023] The top of the receiving cavity 21 is provided with a first connecting component, which is connected to the fixing sleeve 3 and achieves electrical conduction. The receiving cavity 21 is also provided with a surge arrester body 10, and the top of the surge arrester body 10 is provided with a second connecting component 5. The second connecting component 5 is adapted to the first connecting component to achieve the triple functions of mechanical locking, electrical connection, and overheat disconnection.

[0024] The bottom of the surge arrester body 10 is provided with a first hooking component 7, and the bottom of the insulator body 2 is provided with a second hooking component 8. The second hooking component 8 and the first hooking component 7 are adapted to each other. The first hooking component 7 and the second hooking component 8 cooperate with each other to form a one-way anti-fall structure that only allows upward pushing and does not allow downward disengagement.

[0025] The first connecting component includes a fixing base 41, which is a metal conductive component. The fixing base 41 is connected to the fixing sleeve 3 by a fastener 42, which is a bolt, pin, or riveting structure, ensuring a firm mechanical connection and reliable electrical contact between the fixing base 41 and the fixing sleeve 3. A connecting ring 43 is provided at the lower end of the fixing base 41. The connecting ring 43 is a downward-opening cylindrical structure with several arc-shaped slots 44 on its inner wall. The number of arc-shaped slots 44 is consistent with the number of elastic locking units 54 in the second connecting component 5, ensuring a one-to-one locking action. A contact layer 45 is provided on the surface of the arc-shaped slots 44. The contact layer 45 is a silver-plated conductive layer or a copper conductive layer, used to improve conductivity, reduce contact resistance, and enhance locking stability.

[0026] The second connecting component 5 includes a connecting sleeve 51 disposed at the top of the surge arrester body 10. The connecting sleeve 51 is a cylindrical sleeve structure, integrally formed with the top of the surge arrester body 10, and coaxially arranged. The connecting sleeve 51 has several protrusion holes 52. Inside the connecting sleeve 51 is an inner core 53, which is an integral structure with the connecting sleeve 51, together forming the supporting skeleton of the top of the surge arrester body 10. Several sets of elastic locking units 54 are disposed between the inner core 53 and the connecting sleeve 51. One end of the elastic locking unit 54 is connected to the inner core 53, and the other end of the elastic locking unit 54 extends to the protrusion holes 52. The elastic locking unit 54 includes a connecting rod 541 connected to the inner core 53. A sliding sleeve 542 is disposed outside the connecting rod 541. The sliding sleeve 542 is a sleeve structure with one end open and one end closed, and the connecting rod 541 extends into the sliding sleeve 542. The sliding sleeve 542 has an elastic element 543 inside. One end of the elastic element 543 is connected to the inner wall of the sliding sleeve 542, and the other end is connected to the connecting rod 541. In its natural state, the elastic element 543 is in an extended state, pushing the sliding sleeve 542 outward. In this embodiment, the elastic element 543 is a spring. The sliding sleeve 542 is connected to a ball seat 544, and the ball seat 544 is provided with a locking ball 545. The locking ball 545 is located in the extension hole 52 and protrudes outward in the normal state. The locking ball 545 is made of a low-melting-point bismuth-tin alloy with a melting temperature set at 120℃~140℃. This melting point is much higher than the highest temperature in extreme outdoor environments (70℃~80℃). Therefore, it will not melt under normal operation, sun exposure, or high ambient temperature, and will not malfunction. The locking ball 545 will only melt when the arrester body 10 ages and fails, the leakage current increases sharply, or the arrester body overheats and exceeds 120℃. This will cause the elastic locking unit 54 to lose support and achieve automatic unlocking and disengagement of the top connection.

[0027] The first hooking assembly 7 includes a hooking part 71 located at the bottom of the surge arrester body 10. The hooking part 71 is an extension of the bottom of the surge arrester body 10 and is cylindrical. A connecting edge 72 is sleeved on the outside of the hooking part 71. A connecting groove is opened at the bottom of the connecting edge 72. The connecting groove is an annular opening groove for engaging with the hook plate 83. Through grooves 73 are symmetrically arranged on both sides of the connecting edge 72. The through grooves 73 are used to realize the detachable function of the surge arrester body 10. During normal installation, the through grooves 73 and the hook plate 83 are misaligned. The hook plate 83 is blocked by the solid part of the connecting edge 72 and cannot be detached downwards, thus preventing it from falling. When the surge arrester body 10 is damaged and needs to be disassembled, the surge arrester body 10 is clamped with a tool and rotated 180° so that the through groove 73 and the hook plate 83 are aligned. The hook plate 83 can then smoothly enter the through groove 73 and no longer obstruct the connecting edge 72. The surge arrester body 10 can then be smoothly removed downwards.

[0028] The second hook assembly 8 includes an extension 81 located at the bottom end of the insulator body 2. Two connecting arms 82 are symmetrically arranged on both sides of the extension 81. The bottom ends of the connecting arms 82 are hinged to the hook plate 83 via pins. The pins, hook plate 83, and connecting arms 82 are all rigidly hinged, without loosening or shifting. A limiting stop is provided between the connecting arm 82 and the hook plate 83. The limiting stop is a rigid block formed in one piece, restricting the hook plate 83 to rotate only upwards in one direction. When the hook plate 83 rotates downwards to... Figure 2 When the position shown is reached, the limiting stop rigidly locks the hook plate 83, preventing it from rotating downwards. This forces the hook plate 83 to rotate only around the pin within a certain angle, forming a one-way anti-fall locking structure that allows only upward pushing and not downward disengagement. The end of the hook plate 83 is designed with an arc shape, which forms a guide surface when the surge arrester body 10 is pushed upwards, allowing the hook plate 83 to rotate smoothly upwards to avoid obstacles.

[0029] A conductive contact surface 61 is provided at the connection between the insulator body 2 and the extension 81. The conductive contact surface 61 is silver-plated or tin-plated conductive layer to ensure low-resistance conduction. A conductive contact ring 62 is provided on the surge arrester body 10. The conductive contact ring 62 is a metal conductive ring. When the surge arrester body 10 is pushed into place, the conductive contact ring 62 and the conductive contact surface 61 are tightly fitted and make large-area contact, realizing a reliable electrical connection between the bottom end of the surge arrester body 10 and the system grounding terminal.

[0030] The working principle of this system is as follows: The surge arrester body 10 is locked at its top by a locking ball 545 to an arc-shaped slot 44, and its bottom is reliably grounded by a conductive contact ring 62. The surge arrester is in standby protection mode, limiting lightning overvoltage and switching overvoltage on the line. The fuse body 1 is connected in series in the line to protect against short circuits and overload faults. The overall structure is integrated, without looseness, poor contact, or abnormal heating.

[0031] The one-way fall protection principle of the surge arrester body 10 in this system is as follows: When the surge arrester body 10 tends to fall downwards due to the failure of the top connection, the surge arrester body 10 moves downwards, and the solid part of the bottom connecting edge 72 (the part that is not the through groove 73) presses down on the hook plate 83. The hook plate 83 is subjected to downward pressure, but the downward rotation of the hook plate 83 is rigidly blocked by the limiting stop, and it cannot deflect downwards at all. The hook plate 83 forms a rigid support and strong obstruction for the connecting edge 72. The surge arrester body 10 is restricted in the receiving cavity 21 and cannot fall downwards or fall to the ground.

[0032] The overheating disconnection principle of the surge arrester body 10 in this system is as follows: When the surge arrester body 10 ages, gets damp, or the valve plate is damaged during long-term operation, the leakage current increases significantly, and the surge arrester body 10 heats up abnormally, with the temperature rising to 120℃~140℃. The top locking ball 545 is made of a low melting point alloy, which melts after reaching its melting point. The elastic locking unit 54 loses its radial support, the locking ball 545 shrinks, and no longer engages with the arc-shaped locking groove 44. The second connecting component 5 automatically unlocks and disengages from the first connecting component. The surge arrester body 10 falls downward under its own weight. At the moment of falling, it is unidirectionally locked by the bottom hook plate 83 and suspended in the receiving cavity 21, so that it does not fall out or hit the ground.

[0033] The installation method is as follows: S1. Fix the insulator body 2, which has been connected to the fuse body 1, to the tower crossarm through the external connector 31, tighten the bolts, and ensure overall stability.

[0034] S2. Clamp the bottom of the surge arrester body 10 with a tool so that the top of the surge arrester body 10 faces upward and is aligned with the opening of the receiving cavity 21 at the bottom of the insulator body 2.

[0035] S3. Slowly push the surge arrester body 10 upwards along the axial direction.

[0036] S4. The outer wall of the hook-connection part 71 at the bottom of the surge arrester body 10 first contacts the arc-shaped structure at the end of the hook plate 83. Under the action of upward thrust, the hook plate 83 is lifted upward and rotates upward around the pin axis to avoid it. The hook plate 83 rotates upward, providing space for the surge arrester body 10 to continue to move upward.

[0037] S5. Continue pushing the surge arrester body 10 until the second connecting component 5 at the top enters the position of the first connecting component at the top of the receiving cavity 21. Under the pushing force of the elastic element 543, the elastic locking unit 54 pushes the locking ball 545 outward, so that the locking ball 545 is embedded in the arc-shaped groove 44 inside the connecting ring 43. The locking ball 545 is pressed and adhered to the contact layer 45 to achieve mechanical locking and electrical conduction.

[0038] S6. The conductive contact ring 62 in the lower part of the surge arrester body 10 is completely in contact with the conductive contact surface 61 in the insulator body 2, forming a reliable grounding path.

[0039] S7. After releasing the surge arrester body 10, the hook plate 83 rotates downward to a horizontal position under its own weight and is locked by the limit stop, preventing it from rotating downward further. The installation is complete.

[0040] When the surge arrester body 10 needs to be replaced due to aging or damage, it can be disassembled according to the following steps: S10. Use a special tool to clamp the lower part of the surge arrester body 10 to ensure stable force application.

[0041] S20. Slowly rotate the arrester body 10 180° around its own axis.

[0042] S30. After rotation into place, the through groove 73 on the connecting edge 72 is completely aligned with the hook plate 83. The hook plate 83 is no longer blocked by the solid part of the connecting edge 72 and can smoothly enter the through groove 73.

[0043] S40. Pull down the surge arrester body 10, and the hook plate 83 will move into the through slot 73, so that the surge arrester body 10 can be smoothly removed from the receiving cavity 21 of the insulator body 2.

[0044] S50. After disassembly, replace the new surge arrester body 10 and push it in using the original installation method for reuse.

[0045] Therefore, the present invention adopts the above-mentioned surge arrester and fuse combination system, in which the fuse body and the surge arrester body share the same insulator body, and two sets of protection equipment can be connected in one installation, which greatly reduces the on-site construction steps.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A lightning arrester and fuse combination system, characterized by: It includes a fuse body and an insulator body. The insulator body is provided with a fixing sleeve on the outside and a receiving cavity inside. The top of the receiving cavity is provided with a first connecting component, which is connected to the fixing sleeve. The receiving cavity is also provided with a surge arrester body. The top of the surge arrester body is provided with a second connecting component, which is adapted to the first connecting component; The bottom of the surge arrester body is provided with a first hooking component, and the bottom of the insulator body is provided with a second hooking component, the second hooking component and the first hooking component being compatible.

2. The surge arrester and fuse combination system of claim 1, wherein: The first connecting component includes a fixing base, which is connected to the fixing sleeve by a fastener. The lower end of the fixing base is provided with a connecting ring, and the inner sidewall of the connecting ring is provided with a plurality of arc-shaped slots, the surface of which is provided with a contact layer.

3. The surge arrester and fuse combination system according to claim 2, characterized in that: The second connection component includes a connecting sleeve disposed at the top of the surge arrester body, and the connecting sleeve has a plurality of protruding holes; The connecting sleeve has an inner core inside, and a plurality of elastic locking units are provided between the inner core and the connecting sleeve. One end of the elastic locking unit is connected to the inner core, and the other end of the elastic locking unit extends out of the protrusion hole.

4. The surge arrester and fuse combination system according to claim 3, characterized in that: The elastic locking unit includes a connecting rod connected to the inner core, a sliding sleeve is provided on the outside of the connecting rod, an elastic element is provided inside the sliding sleeve, one end of the elastic element is connected to the inner wall of the sliding sleeve, and the other end of the elastic element is connected to the connecting rod. The sliding sleeve is connected to the ball seat, and the ball seat is provided with a locking ball, which is disposed in the protrusion hole.

5. The surge arrester and fuse combination system according to claim 4, characterized in that: The locking ball is made of a fusible alloy and is compatible with the contact layer.

6. The surge arrester and fuse combination system according to claim 5, characterized in that: The first hooking assembly includes a hooking part disposed at the bottom end of the surge arrester body. A connecting edge is sleeved on the outside of the hooking part. A connecting groove is opened at the bottom of the connecting edge. Through grooves are symmetrically arranged on both sides of the connecting edge.

7. The surge arrester and fuse combination system according to claim 6, characterized in that: The second hook assembly includes an extension portion disposed at the bottom end of the insulator body. Two connecting arms are symmetrically arranged on both sides of the extension portion. A hook plate is hinged to the bottom end of each connecting arm, and the end of the hook plate is configured as an arc-shaped structure.

8. A surge arrester and fuse combination system according to claim 7, characterized in that: A conductive contact surface is provided at the connection between the insulator body and the extension, and a conductive contact ring is provided on the surge arrester body, which is in contact with the conductive contact surface.

9. A surge arrester and fuse combination system according to claim 8, characterized in that: The top end of the fuse body is connected to the top end of the insulator body via a first connector, and the bottom end of the fuse body is connected to the bottom end of the insulator body via a second connector.

10. A surge arrester and fuse combination system according to claim 9, characterized in that: An external connector is fixedly connected to the fixed sleeve.

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