Full-range fuse

Abstract

The invention provides a full-range fuse. The full-range fuse comprises a base, a supporting device, a current-limiting fuse assembly, a jet fuse drop assembly, a first static contact and a second static contact, the first static contact and the second static contact are respectively arranged at two end parts of the base; the current-limiting fuse assembly and the jet fuse drop assembly are both arranged on the supporting device and are in conductive connection, the current-limiting fuse assembly and the jet fuse drop assembly have a preset overlapping part, and a first moving contact of the current-limiting fuse assembly is in conductive connection with a first static contact. A second moving contact and a second static contact of the injection type fuse drop assembly are in conductive connection. The first moving contact and the first static contact are disconnected after the current-limiting fuse assembly is fused, and the second moving contact is turned over relative to the second static contact after the jet fuse drop-out assembly is fused, so that the first moving contact and the first static contact are disconnected. According to the invention, rapid breaking of full-range current is realized, and the short-circuit breaking capacity is improved.

Description

Technical Field

[0001] This invention relates to the field of electrical switch technology, and more specifically, to a full-range fuse. Background Technology

[0002] A fuse is a device that breaks the current to disconnect a circuit by melting one or more specially designed and proportional components when the current exceeds a given value for a sufficient time.

[0003] Existing fuse products can be categorized by structure into drop-out fuses and enclosed fuses; by breaking principle into ejector fuses and current-limiting fuses; and by breaking current range into backup fuses, general-purpose fuses, and full-range fuses, with the breaking current range increasing from small to large. Drop-out fuses are primarily used for overload and short-circuit protection of transformers used in outdoor overhead power lines. Based on the principle of ejector principle in distribution transformers, existing drop-out fuses (also known as ejector fuses) extinguish the electric arc by ejecting gas generated from the arc energy; for details on drop-out ejector fuses, see [link to relevant documentation]. Figure 1 The main problems include untimely interruption during transformer faults, large protection dispersion, over-tripping of line protection, and low reliability of large-capacity interruption. However, current-limiting fuses (fuses that limit the current to a level far below the expected peak current during operation within a specified current range, see [link to relevant documentation]) offer a solution. Figure 2 These are mostly used for the protection of transformers in cable lines and substations. They are characterized by fast breaking speed for large currents, low dispersion, and large breaking capacity. However, their breaking speed for small currents is lower than that of jet fuses, and they cannot achieve full-range current protection. Summary of the Invention

[0004] In view of this, the present invention proposes a full-range fuse, which aims to solve the problems of untimely interruption, large protection dispersion, over-level tripping of line protection, and low reliability of large-capacity interruption of existing jet-type fuses, as well as the low interruption speed of current-limiting fuses at small currents, which cannot achieve full-range protection.

[0005] This invention proposes a full-range fuse, comprising: a base, a support device, a current-limiting fuse assembly, a jet-type fuse drop-out assembly, a first stationary contact, and a second stationary contact; wherein the first stationary contact and the second stationary contact are respectively disposed at two ends of the base; the current-limiting fuse assembly and the jet-type fuse drop-out assembly are both disposed on the support device and are electrically connected, and there is a predetermined overlap between the current-limiting fuse assembly and the jet-type fuse drop-out assembly; the first moving contact of the current-limiting fuse assembly is electrically connected to the first stationary contact, and the second moving contact of the jet-type fuse drop-out assembly is electrically connected to the second stationary contact; the current-limiting fuse assembly is used to disconnect the first moving contact from the first stationary contact after melting, and the jet-type fuse drop-out assembly is used to flip the second moving contact relative to the second stationary contact after melting, thereby disconnecting the first moving contact from the first stationary contact.

[0006] Furthermore, in the aforementioned full-range fuse, the support device includes: a bearing mechanism, a conductive frame, a connecting mechanism, and a positioning mechanism; wherein, the current-limiting fuse assembly is disposed on the bearing mechanism, and the upper electrode of the current-limiting fuse assembly is electrically connected to the first moving contact through the connecting mechanism; the ejector fuse drop-out assembly is connected to one side of the bearing mechanism through the positioning mechanism, so that the ejector fuse drop-out assembly and the current-limiting fuse assembly are partially stacked; the conductive frame is disposed between the lower electrode of the current-limiting fuse assembly and the ejector fuse drop-out assembly.

[0007] Furthermore, in the aforementioned full-range fuse, the carrying mechanism includes: a carrying cylinder with a top opening and an arc-shaped carrying body; wherein, the current-limiting fuse assembly is inserted into the carrying cylinder; the bottom of the carrying body is connected to the top of the carrying cylinder and in contact with the current-limiting fuse assembly, and the top of the carrying body is detachably connected to the connecting mechanism.

[0008] Furthermore, in the aforementioned full-range fuse, the connection mechanism includes: a bracket, a cover, and a return member; wherein, the bracket is provided with an arc-shaped body, which surrounds the outside of the upper electrode and is detachably connected to the top of the carrier; the cover is rotatably connected to the bracket and makes conductive contact, and the cover is placed on the top of the upper electrode; the first moving contact is rotatably connected to the bracket and makes conductive contact, and the first moving contact is also hooked to the cover; the return member is disposed between the cover and the bracket; the striker of the current-limiting fuse assembly is used to push the cover to rotate when a large current passes through, so as to separate it from the first moving contact.

[0009] Furthermore, in the aforementioned full-range fuse, the connection mechanism further includes: a locking hook and a locking shaft; wherein, a circular limiting body is provided at the bottom of the cover, the limiting body covers the outside of the upper electrode, and a locking hook is provided at the end of the cover facing the first moving contact; the first moving contact is provided with a locking shaft that hooks with the locking hook.

[0010] Furthermore, in the aforementioned full-range fuse, the connection mechanism further includes: two conductive shafts; wherein, one end of the locking hook connected to the cover is rotatably connected to the bracket via one of the conductive shafts; and the first moving contact is rotatably connected to the bracket via the other conductive shaft.

[0011] Furthermore, in the aforementioned full-range fuse, an arc-shaped positioning plate is provided on one side of the bearing cylinder; the ejector fuse drop-out assembly is placed inside the positioning plate; the conductive frame is disposed inside the bearing cylinder, and the conductive frame makes conductive contact with the lower electrode of the current-limiting fuse assembly and the upper contact of the ejector fuse drop-out assembly.

[0012] Furthermore, in the aforementioned full-range fuse, the positioning mechanism includes: a protective cover and a positioning frame; wherein, the positioning frame is disposed between the upper contact and the arc suppression tube of the drop-out assembly of the jet-type fuse; the protective cover and the positioning plate are detachably connected, and the positioning frame is sandwiched between the protective cover and the positioning plate; the upper contact is provided with a conductive cap, and the protective cover covers the top of the conductive cap.

[0013] Furthermore, in the aforementioned full-range fuse, the upper contact is located at the top of the positioning frame; the arc-extinguishing tube is inserted into a groove at the bottom of the positioning frame; the positioning frame has two limiting holes that communicate with the groove, and two rivets are correspondingly located in the two limiting holes, and the distance between the two rivets is less than the outer diameter of the arc-extinguishing tube, so as to clamp the arc-extinguishing tube.

[0014] Furthermore, the aforementioned full-range fuse also includes: an insulating sleeve; wherein the insulating sleeve is fitted over the outside of the current-limiting fuse assembly and placed inside the carrier cylinder; the main body of the conductive frame is placed between the insulating sleeve and the side wall of the carrier cylinder, the first end of the conductive frame is in conductive contact with the lower electrode, and the second end of the conductive frame is in conductive contact with the upper contact.

[0015] In this invention, a first stationary contact and a second stationary contact are respectively provided at the two ends of the base. The current-limiting fuse assembly and the ejector fuse drop-out assembly are electrically connected together through a support device. After the current-limiting fuse assembly melts, the first moving contact disconnects from the first stationary contact. After the ejector fuse drop-out assembly melts, the second moving contact flips relative to the second stationary contact, thereby disconnecting the first moving contact from the first stationary contact. In this way, whether a large current or a small current passes through, it can be disconnected in time, realizing rapid interruption of current across the entire range. It can also improve the short-circuit breaking capacity and enhance the protection reliability of the full-range fuse. This solves the problems of untimely interruption, large protection dispersion, cascading tripping of line protection, and low reliability of large-capacity interruption in the prior art, as well as the low interruption speed of the current-limiting fuse for small currents, which cannot achieve full-range protection. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a drop-out ejector fuse in the prior art;

[0018] Figure 2 This is a schematic diagram of the structure of a current-limiting fuse in the prior art;

[0019] Figure 3 This is a schematic diagram of the structure of a full-range fuse provided in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of a full-range fuse during tripping, provided in an embodiment of the present invention.

[0021] Figure 5 This is an exploded structural diagram of a full-range fuse provided in an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of the cover structure in the full-range fuse provided in this embodiment of the invention;

[0023] Figure 7 A schematic diagram of the structure of the first moving contact in a full-range fuse provided in an embodiment of the present invention;

[0024] Figure 8 A schematic diagram of the load-bearing mechanism in a full-range fuse provided in an embodiment of the present invention;

[0025] Figure 9 A side cross-sectional view of the load-bearing mechanism in a full-range fuse provided in an embodiment of the present invention;

[0026] Figure 10 A schematic diagram of the structure of the protective cover in the full-range fuse provided in the embodiment of the present invention;

[0027] Figure 11 This is a schematic diagram of the positioning frame in the full-range fuse provided in an embodiment of the present invention. Detailed Implementation

[0028] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] See Figures 3 to 11 The figure shows a preferred structure of the full-range fuse in this embodiment. As shown, the full-range fuse includes: a base 1, a support device 2, a current-limiting fuse assembly 3, a jet-type fuse drop-out assembly 4, a first stationary contact 5, and a second stationary contact 6. The first stationary contact 5 and the second stationary contact 6 are respectively disposed at two ends of the base 1. The structure and shape of the first stationary contact 5 and the second stationary contact 6 can be found in [reference needed]. Figure 3 and Figure 4 The structure of the first stationary contact 5 and the second stationary contact 6 is described in detail in this embodiment. For specific implementation details, please refer to the existing technology for the structure of the first stationary contact 5 and the second stationary contact 6; this embodiment will not repeat the details here.

[0030] Both the current-limiting fuse assembly 3 and the ejector-type fuse drop-out assembly 4 are mounted on the support device 2, and are electrically connected, with a predetermined overlap between them. Specifically, although the current-limiting fuse assembly 3 and the ejector-type fuse drop-out assembly 4 are mounted on the support device 2, they are arranged adjacent to each other, and have a partial overlap area. More specifically, the lower part of the current-limiting fuse assembly 3 may overlap with the upper part of the ejector-type fuse drop-out assembly 4, or the upper part of the current-limiting fuse assembly 3 may overlap with the lower part of the ejector-type fuse drop-out assembly 4; this embodiment does not impose any limitations on this.

[0031] In this embodiment, see Figure 3 The current-limiting fuse assembly 3 is placed on top, and the jet-type fuse drop-off assembly 4 is placed below. The lower part of the current-limiting fuse assembly 3 overlaps with the upper part of the jet-type fuse drop-off assembly 4. Alternatively, the current-limiting fuse assembly 3 can be placed below, and the jet-type fuse drop-off assembly 4 can be placed above, with the upper part of the current-limiting fuse assembly 3 overlapping with the lower part of the jet-type fuse drop-off assembly 4. This embodiment does not impose any restrictions on this.

[0032] The first moving contact 31 of the current-limiting fuse assembly 3 is electrically connected to the first stationary contact 5, and the second moving contact 41 of the ejector-type fuse drop-out assembly 4 is electrically connected to the second stationary contact 6. Specifically, the current-limiting fuse assembly 3 has a moving contact, and the ejector-type fuse drop-out assembly 4 also has a moving contact. To facilitate the distinction between the moving contact of the current-limiting fuse assembly 3 and the moving contact of the ejector-type fuse drop-out assembly 4, the moving contact of the current-limiting fuse assembly 3 is referred to as the first moving contact 31, and the moving contact of the ejector-type fuse drop-out assembly 4 is referred to as the second moving contact 41.

[0033] When a large current passes through, that is, when the current far exceeds the rated current and short-circuit current of the current-limiting fuse assembly 3, the fuse wire of the current-limiting fuse assembly 3 blows, and the first moving contact 31 disconnects from the first stationary contact 5.

[0034] When a small current passes through, that is, when the current exceeds the rated current of the ejector fuse drop-out assembly 4, after the fuse of the ejector fuse drop-out assembly 4 melts, the second moving contact 41 flips relative to the second stationary contact 6, causing the first moving contact 31 to disconnect from the first stationary contact 5.

[0035] In specific implementation, the structure of the current-limiting fuse assembly 3 and the structure of the jet-type fuse drop-out assembly 4 can both refer to the structures in the prior art, and will not be described again in this embodiment.

[0036] When the full-range fuse is in the closed state, the current forms a conductive circuit through the first stationary contact 5, the current-limiting fuse assembly 3, the ejector fuse drop-out assembly 4, and the second stationary contact 6. At this time, the first moving contact 31 of the current-limiting fuse assembly 3 is placed inside the first stationary contact 5. The second stationary contact 6 is provided with a snap-fit ​​groove 61, and the second moving contact 41 of the ejector fuse drop-out assembly 4 is rotatably disposed in the snap-fit ​​groove 61. One end of the fuse wire 44 in the ejector fuse drop-out assembly 4 is connected to the upper contact 42, and the fuse wire 44 passes through the arc-extinguishing tube 43 and is then tightly connected to the second moving contact 41. It should be noted that the fuse wire 44, the upper contact 42, and the arc-extinguishing tube 42 are all part of the structure of the ejector fuse drop-out assembly 4, and the specific connection relationship can be found in the prior art, which will not be described again in this embodiment.

[0037] In the closed state, when a large current such as a short circuit passes through, the fuse wire of the current-limiting fuse assembly 3 blows, the first moving contact 31 disconnects from the first stationary contact 5, and the current-limiting fuse assembly 3, the ejector fuse drop-out assembly 4, and the support device 2 flip and fall under the action of gravity, forming a clear break. In the closed state, when a small current such as an overload passes through, the fuse wire 44 of the ejector fuse drop-out assembly 4 blows, the second moving contact 41 loses the tightening force of the fuse wire 44 and flips relative to the second stationary contact 6, and the current-limiting fuse assembly 3, the ejector fuse drop-out assembly 4, and the support device 2 flip and fall under the action of gravity and the pressure of the first stationary contact 5, forming a clear break.

[0038] As can be seen, in this embodiment, the two ends of the base 1 are respectively provided with a first stationary contact 5 and a second stationary contact 6. The current-limiting fuse assembly 3 and the ejector fuse drop-out assembly 4 are electrically connected together through the support device 2. After the current-limiting fuse assembly 3 melts, the first moving contact 31 is disconnected from the first stationary contact 5. After the ejector fuse drop-out assembly 4 melts, the second moving contact 41 is flipped relative to the second stationary contact 6, thereby causing the first moving contact 31 to disconnect from the first stationary contact 5. In this way, whether a large current or a small current passes through, it can be disconnected in time, realizing the rapid interruption of the full range of currents, and improving the short-circuit breaking capacity. This improves the protection reliability of the full range fuse and solves the problems of untimely interruption of ejector fuses, large protection dispersion, over-tripping of line protection, low reliability of large capacity interruption, and low interruption speed of small current of current-limiting fuses in the prior art, which cannot achieve full range protection.

[0039] See Figures 3 to 11 In the above embodiments, the support device 2 includes: a bearing mechanism 21, a conductive frame 22, a connecting mechanism 23, and a positioning mechanism 24. The current-limiting fuse assembly 3 is disposed on the bearing mechanism 21, and the upper electrode 33 of the current-limiting fuse assembly 3 is electrically connected to the first moving contact 31 via the connecting mechanism 23. Specifically, the upper electrode 33 is a component of the current-limiting fuse assembly 3, and is disposed at the top of the current-limiting fuse assembly 3, while a lower electrode 34 is disposed at the bottom of the current-limiting fuse assembly 3.

[0040] The ejector-type fuse drop-out assembly 4 is connected to one side of the support mechanism 21 via a positioning mechanism 24, so that the ejector-type fuse drop-out assembly 4 and the current-limiting fuse assembly 3 are partially stacked. Specifically, the positioning mechanism 24 is located on one side of the support mechanism, and the ejector-type fuse drop-out assembly 4 is fixed to the support mechanism 21 via the positioning mechanism 24. Since the current-limiting fuse assembly 3 is installed inside the support mechanism 21, there is a partial overlap area between the ejector-type fuse drop-out assembly 4 and the current-limiting fuse assembly 3.

[0041] The conductive frame 22 is disposed between the lower electrode 34 of the current-limiting fuse assembly 3 and the ejector fuse drop-out assembly 4, and the conductive frame 22 electrically connects the lower electrode 34 and the ejector fuse drop-out assembly 4 together.

[0042] The supporting mechanism 21 includes a supporting cylinder 211 and an arc-shaped supporting body 212. The supporting cylinder 211 is open at the top and closed at the bottom, and its interior is hollow. A current-limiting fuse assembly 3 is inserted into the supporting cylinder 211 from the top. Specifically, if the height of the supporting cylinder 211 is less than the height of the current-limiting fuse assembly 3, then only the lower half of the current-limiting fuse assembly 3 is inserted into the supporting cylinder 211.

[0043] The bottom of the carrier 212 is connected to the top of the carrier cylinder 211, and the carrier 212 is in contact with the current-limiting fuse assembly 3. The top of the carrier 212 is detachably connected to the connecting mechanism 23. Specifically, the arc shape of the carrier 212 matches the arc shape of the cylinder wall of the carrier cylinder 211. The current-limiting fuse assembly 3 is cylindrical, and the outer wall of the upper half of the current-limiting fuse assembly 3 fits against the arc shape of the carrier 212. The overall height of the carrier 212 and the carrier cylinder 211 matches the height of the current-limiting fuse assembly 3. Both the carrier 212 and the carrier cylinder 211 are made of insulating material.

[0044] Preferably, the carrier 212 and the carrier cylinder 211 are integrally formed.

[0045] Preferably, an insulating rod operating pull ring 12 is provided on the top of the side of the carrier 212 away from the current-limiting fuse assembly 3, and the opening and closing operations are realized by operating the insulating rod operating pull ring 12.

[0046] The connecting mechanism 23 includes a bracket 231, a cover 232, and a return member 233. The bracket 231 is provided with an arc-shaped body 2311, which is disposed outside the upper electrode 33 of the current-limiting fuse assembly 3. The arc-shaped body 2311 is detachably connected to the top of the carrier 212 and is in conductive contact with the upper electrode 33 of the current-limiting fuse assembly 3.

[0047] Specifically, the bracket 231 may include: a body 2312, an arc-shaped body 2311, and two sets of mounting plates 2313. The body 2312 is arc-shaped and is fitted around the side wall of the current-limiting fuse assembly 3, with its inner wall in contact with the outer wall of the current-limiting fuse assembly 3. The arc-shaped body 2311 is located on top of the body 2312 and is in contact with the outer wall of the upper electrode 33 of the current-limiting fuse assembly 3, and the two are in conductive contact. The two ends of the arc-shaped body 2311 are detachably connected to the top of the carrier 212, thus facilitating the upward pulling out of the current-limiting fuse assembly 3 for replacement. Two sets of mounting plates 2313 are disposed along the height direction of the body 2312 on the outer wall of the body 2312 on the side away from the current-limiting fuse assembly 3. Each set of mounting plates 2313 includes two mounting plates 2313 arranged side by side. Each mounting plate 2313 has a through hole, and the positions of the through holes on the two mounting plates 2313 are corresponding.

[0048] In specific implementation, the top of the support body 212 has two threaded holes 9 at corresponding positions. The two ends of the arc-shaped body 2311 correspond one-to-one with the two threaded holes 9 on the top of the support body 212. Each end of the arc-shaped body 2311 has a through hole, the position of which corresponds to the position of the threaded hole 9. Two bolts 10 are inserted one-to-one through the through holes at the two ends of the arc-shaped body 2311 and then screwed one-to-one with the two threaded holes 9 on the top of the support body 212, thereby realizing the detachable connection between the top of the support body 212 and the arc-shaped body 2311 by bolts 10.

[0049] The cover 232 is rotatably connected to the bracket 231, and the cover 232 and the bracket 231 are in conductive contact. The cover 232 covers the top of the upper electrode 33 of the current-limiting fuse assembly 3. Specifically, the top of the cover 232 covers the top of the upper electrode 33 of the current-limiting fuse assembly 3, and the bottom of the cover 232 is provided with an annular limiting body 236, which covers the outside of the upper electrode 33. The end of the cover 232 facing the first moving contact 31 ( Figure 6 The left end shown is rotatably connected to the bracket 231. The limiting body 236 has a rain and snow shielding effect and can protect the striker 32 of the current-limiting fuse assembly 3 from being ejected smoothly.

[0050] The first moving contact 31 is rotatably connected to the bracket 231, and the first moving contact 31 is in conductive contact with the bracket 231. The first moving contact 31 is also hooked to the cover 232.

[0051] Preferably, the connecting mechanism 23 further includes a locking hook 234 and a locking shaft 235. The end of the cover 232 facing the first moving contact 31 ( Figure 6The left end shown is provided with a locking hook 234, and the first moving contact 31 is provided with a locking shaft 235, which is hooked to the locking hook 234.

[0052] More preferably, the connecting mechanism 23 further includes two conductive shafts 237. One end of the locking hook 234 connected to the cover 232 is rotatably connected to the bracket 231 via one of the conductive shafts 237. Specifically, an extension is provided on one side of the top of the cover 232, the bottom of which is connected to the locking hook 234. The locking hook 234 has a through hole, through which the conductive shaft 237 rotatably passes. The two ends of the conductive shaft 237 correspond one-to-one with the through holes on the two upper mounting plates 2313 in the bracket 231. Each end of the conductive shaft 237 rotatably passes through the corresponding through hole on the mounting plate 2313 and connects to a positioning member. The positioning member limits the position of the end of the conductive shaft 237, preventing it from detaching from the mounting plate 2313. The cover 232 can rotate around the conductive shaft 237, and the cover 232 and the bracket 231 are in conductive contact via the conductive shaft 237.

[0053] The first moving contact 31 is rotatably connected to the bracket 231 via another conductive shaft 237. Specifically, the top of the first moving contact 31 is electrically connected to the first stationary contact 5. The side of the first moving contact 31 facing the bracket 231 is provided with a locking shaft 235 and two fixing feet 311. Each fixing foot 311 has a through hole. The two fixing feet 311 correspond one-to-one with the two mounting plates 2313 located below in the bracket 231. The through hole on each fixing foot 311 corresponds to the through hole on the corresponding mounting plate 2313. After the conductive shaft 237 rotatably passes through the through holes on the two fixing feet 311 and the through holes on the two mounting plates 2313, the two ends of the conductive shaft 237 are respectively connected to two positioning members. The positioning members limit the ends of the conductive shaft 237 to prevent the conductive shaft 237 from detaching from the mounting plate 2313. The first moving contact 31 can rotate around the conductive shaft 237, and the first moving contact 31 and the bracket 231 are in conductive contact through the conductive shaft 237.

[0054] The return component 233 is disposed between the cover 232 and the bracket 231. Specifically, the return component 233 is a torsion spring. The locking hook 234 has a protrusion 11 at the position where the through hole is provided. The protrusion 11 has a through hole, which is connected to the through hole on the locking hook 234 to facilitate the insertion of the conductive shaft 237. The torsion spring is sleeved on the outside of the protrusion 11. One end of the torsion spring is connected to the cover 232, and the other end of the torsion spring is connected to the bracket 231.

[0055] The striker 32 of the current-limiting fuse assembly 3 is used to push the cover 232 to rotate when a large current passes through, so as to separate it from the first moving contact 31. Specifically, the striker 32 is a component of the current-limiting fuse assembly 3. In the closed state, the striker 32 is placed inside the current-limiting fuse assembly 3 and below the upper electrode 33. The locking hook 234 of the cover 232 is hooked with the locking shaft 235 of the first moving contact 31. When a large current passes through, the striker 32 is ejected. The ejected striker 32 pushes the cover 232 to rotate around its conductive shaft 237, so that the locking hook 234 separates from the locking shaft 235. Under the pressure of the first stationary contact 5, the first moving contact 31 flips downward, and the first moving contact 31 separates from the first stationary contact 5, forming a break.

[0056] Preferably, the first moving contact 31 and the bracket 231 can be electrically connected by a flexible wire.

[0057] It should be noted that the structures of the upper electrode 33, the lower electrode 34, and the striking pin 32 all belong to the structure of the current-limiting fuse assembly 3. For specific connection relationships, please refer to the prior art. This embodiment will not be described in detail here.

[0058] See Figures 3 to 11 An arc-shaped positioning plate 213 is provided on one side of the bearing cylinder 211. Specifically, the positioning plate 213 is provided on the side of the bearing cylinder 211 facing the jet-type fuse drop-off assembly 4, and the jet-type fuse drop-off assembly 4 is placed inside the positioning plate 213.

[0059] The conductive frame 22 is disposed inside the bearing cylinder 211, and the conductive frame 22 is in conductive contact with the lower electrode 34 of the current-limiting fuse assembly 3 and the upper contact 42 of the jet-type fuse drop assembly 4.

[0060] Preferably, the full-range fuse further includes an insulating sleeve 8. The insulating sleeve 8 is cylindrical and is fitted over the outside of the current-limiting fuse assembly 3, and is placed inside the carrier cylinder 211. The insulating sleeve 8 serves to provide insulation and sealing.

[0061] The main body of the conductive frame 22 is arc-shaped and is positioned between the outer wall of the insulating sleeve 8 and the inner wall of the bearing cylinder 211. The first end of the conductive frame 22 is perpendicularly connected to the main body and is positioned at the bottom of the lower electrode 34 of the current-limiting fuse assembly 3, making conductive contact with the lower electrode 34. The second end of the conductive frame 22 is perpendicularly connected to the main body and extends towards the drop-off assembly 4 of the ejector fuse, making conductive contact with the upper contact 42 of the drop-off assembly 4.

[0062] See Figure 5 , Figure 10 and Figure 11 The positioning mechanism 24 includes a protective cover 241 and a positioning frame 242. The positioning frame 242 is disposed between the upper contact 42 and the arc-extinguishing tube 43 of the ejector fuse drop-out assembly 4. Specifically, the upper contact 42, the arc-extinguishing tube 43, the fuse 44, and the second moving contact 41 are all components of the ejector fuse drop-out assembly 4. The upper contact 42 is connected to the positioning frame 242, and the positioning frame 242 is connected to the arc-extinguishing tube 43.

[0063] Preferred, see Figure 11 The upper contact 42 of the jet-type fuse drop-out assembly 4 is located on the top of the positioning frame 242. The bottom of the positioning frame 242 is provided with a recessed groove 2421 that extends towards the top. The top of the arc-extinguishing tube 43 is inserted into the groove 2421 at the bottom of the positioning frame 242.

[0064] The positioning frame 242 has two limiting holes 2422, which penetrate the positioning frame 242 and are connected to the groove 2421. Two rivets 243 correspond one-to-one with the two limiting holes 2422, each rivet 243 being positioned within its corresponding limiting hole 2422, thus connecting the rivet 243 to the positioning frame 242. Specifically, the rivet 243 is connected to both the positioning frame 242 and the upper contact 42. After the arc-extinguishing tube 43 is inserted into the groove 2421 of the positioning frame 242, the distance between the two rivets 243 is less than the outer diameter of the arc-extinguishing tube 43. Therefore, the two rivets 243 clamp the arc-extinguishing tube 43, connecting the rivets 243 to the positioning frame 242, the upper contact 42, and the arc-extinguishing tube 43. In other words, the positioning frame 242 connects the upper contact 42 to the arc-extinguishing tube 43.

[0065] The protective cover 241 is detachably connected to the positioning plate 213, and the positioning bracket 242 is clamped between the protective cover 241 and the positioning plate 213. For details, see [link to documentation]. Figure 10 The protective cover 241 includes a cover plate 2411 and a connecting body 2412. An arc-shaped groove is formed at the first end of the cover plate 2411, which contacts the outer wall of the current-limiting fuse assembly 3. The upper contact 42 and the positioning bracket 242 of the ejector fuse drop-out assembly 4 are both located below the cover plate 2411. The connecting body 2412 is vertically disposed at the second end of the cover plate 2411, and a receiving groove 13 is formed on the inner wall of the connecting body 2412 facing the positioning bracket 242.

[0066] The positioning plate 213 has a mounting groove 14 on the side facing the jet-type fuse drop-out assembly 4. The positioning frame 242 is clamped in the receiving groove 13 of the connecting body 2412 and the mounting groove 14 of the positioning plate 213, thereby realizing the positioning of the positioning frame 242 and preventing the positioning frame 242 from rotating.

[0067] The connector 2412 has positioning holes 24121 at both ends facing the positioning frame 242, and the positioning plate 213 has threaded holes 9 at both ends. The two positioning holes 24121 on the connector 2412 correspond one-to-one with the two threaded holes 9 on the positioning plate 213. Each positioning hole 24121 on the connector 2412 is connected to the corresponding threaded hole 9 by a bolt 10. Specifically, there are two bolts 10, which correspond one-to-one with the two positioning holes 24121. Each bolt 10 passes through the corresponding positioning hole 24121 and is screwed into the corresponding threaded hole 9, so that the protective cover 241 is connected to the positioning plate 213. Since the positioning frame 242 is clamped in the receiving groove 13 and the placement groove 14, the jet-type fuse drop assembly 4 is connected to the positioning plate 213 on the bearing cylinder 211 through the positioning frame 242 and the protective cover 241, thus realizing the connection between the jet-type fuse drop assembly 4 and the support device 2. Furthermore, the jet-type fuse drop-out assembly 4 is securely connected to the support cylinder 211 and will not rotate.

[0068] The upper contact 42 of the ejector-type fuse drop-out assembly 4 is provided with a conductive cap 7. A protective cover 241 is placed on top of the conductive cap 7, so that both the upper contact 42 and the conductive cap 7 are located below the cover plate 2411 of the protective cover 241. The protective cover 241 can not only fix the ejector-type fuse drop-out assembly 4, but also protect the upper contact 42 and the conductive cap 7 from rain and snow corrosion. By removing the protective cover 241, the positioning plate 213 can be separated from the ejector-type fuse drop-out assembly 4, making it easy to replace the fuse 44.

[0069] In practice, if the positioning frame 242 is rectangular, then the receiving groove 13 on the connecting body 2412, the placement groove 14 on the positioning plate 213, and the groove on the bearing cylinder 211 are all rectangular.

[0070] Combination Figures 3 to 11 This section introduces the usage process of full-range fuses:

[0071] When the full-range fuse is in the closed state, the cover 232 is pressed against the top of the upper electrode 33 of the current-limiting fuse assembly by the torsion spring. The locking hook 234 is hooked with the locking shaft 235 of the first moving contact 31, so that the first moving contact 31 does not rotate and rests on the first stationary contact 5. The second moving contact 41 of the ejector fuse drop-out assembly 4 does not rotate under the tightening force of the fuse wire 44, and the second moving contact 41 is placed in the locking groove 61 of the second stationary contact 6, so that the full-range fuse can maintain a stable closed state.

[0072] The current passes through the first stationary contact 5, the first moving contact 31, two conductive shafts 237, the locking shaft 235, the locking hook 234, the bracket 231, the current-limiting fuse assembly 3, the conductive frame 22, the upper contact 42 of the ejector fuse drop-out assembly 4, the fuse wire 44, the second moving contact 41, and the second stationary contact 6 to form a conductive circuit.

[0073] When the circuit is closed, if a large current such as a short circuit passes through, the breaking pin 32 of the current-limiting fuse assembly 3 pops out, the cover 232 flips over, the locking hook 234 separates from the locking shaft 235, and the first moving contact 31 loses the hooking force of the locking hook 234 and can rotate relative to the bracket 231. Furthermore, under the pressure of the first stationary contact 5, the first moving contact 31 flips over and loses the clamping force. Therefore, the current-limiting fuse assembly 3, the ejector fuse drop-out assembly 4, and the support device 2 as a whole flip and fall under the action of gravity, forming a clear break. (See also...) Figure 4 .

[0074] When the circuit is closed, if a small current such as an overload passes through, the fuse 44 of the ejector fuse drop-off assembly 4 melts, the second moving contact 41 loses the tightening force of the fuse 44 and flips in the locking groove 61 of the second stationary contact 6, and the current-limiting fuse assembly 3, the ejector fuse drop-off assembly 4 and the support device 2 as a whole flip and fall under the action of gravity and the pressure of the first stationary contact 5, forming a clear break.

[0075] Maintenance personnel can use an insulated rod to operate the pull ring 12 to perform opening and closing operations.

[0076] In practice, the fuse 44 of the current-limiting fuse assembly 3 and the ejector fuse drop-out assembly 4 can be replaced respectively.

[0077] In summary, in this embodiment, since the current-limiting fuse assembly 3 has the characteristics of fast breaking speed, low dispersion, and large breaking capacity for large currents, the full-range fuse combines the ejector fuse drop-out assembly 4 and the current-limiting fuse assembly 3 in series. When a large current such as a short circuit occurs, the current-limiting fuse assembly 3 breaks the circuit, and when a small current such as an overload occurs, the ejector fuse drop-out assembly 4 breaks the circuit. In this way, whether a large current or a small current is passing through, the circuit can be broken in time, realizing rapid breaking of current across the entire range. This also improves the short-circuit breaking capacity, enhances the protection reliability of the full-range fuse, and reduces the probability of a deflagration accident caused by a transformer fault.

[0078] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0079] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0080] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A full-range fuse, characterized in that, include: The components include: a base (1), a support device (2), a current-limiting fuse assembly (3), a jet-type fuse drop-out assembly (4), a first stationary contact (5), and a second stationary contact (6); among which, The first stationary contact (5) and the second stationary contact (6) are respectively disposed at the two ends of the base (1); The current-limiting fuse assembly (3) and the jet-type fuse drop-out assembly (4) are both disposed on the support device (2) and are electrically connected. The current-limiting fuse assembly (3) and the jet-type fuse drop-out assembly (4) have a preset overlap. The first moving contact (31) of the current-limiting fuse assembly (3) is electrically connected to the first stationary contact (5), and the second moving contact (41) of the jet-type fuse drop-out assembly (4) is electrically connected to the second stationary contact (6). The current-limiting fuse assembly (3) is used to disconnect the first moving contact (31) from the first stationary contact (5) after the fuse is broken. The jet-type fuse drop assembly (4) is used to flip the second moving contact (41) relative to the second stationary contact (6) after the fuse is broken, thereby disconnecting the first moving contact (31) from the first stationary contact (5).

2. The full-range fuse according to claim 1, characterized in that, The support device (2) includes: a bearing mechanism (21), a conductive frame (22), a connecting mechanism (23), and a positioning mechanism (24); wherein, The current-limiting fuse assembly (3) is disposed on the bearing mechanism (21), and the upper electrode (33) of the current-limiting fuse assembly (3) is electrically connected to the first moving contact (31) through the connecting mechanism (23); The ejector fuse drop-out assembly (4) is connected to one side of the bearing mechanism (21) through the positioning mechanism (24) so ​​that the ejector fuse drop-out assembly (4) is partially stacked with the current-limiting fuse assembly (3); The conductive frame (22) is disposed between the lower electrode (34) of the current-limiting fuse assembly (3) and the jet-type fuse drop-out assembly (4).

3. The full-range fuse according to claim 2, characterized in that, The supporting mechanism (21) includes: a top-opening supporting cylinder (211) and an arc-shaped supporting body (212); wherein, The current-limiting fuse assembly (3) is inserted into the bearing cylinder (211); The bottom of the carrier (212) is connected to the top of the carrier cylinder (211) and in contact with the current-limiting fuse assembly (3), and the top of the carrier (212) is detachably connected to the connecting mechanism (23).

4. The full-range fuse according to claim 3, characterized in that, The connecting mechanism (23) includes: a bracket (231), a cover (232), and a return component (233); wherein, The bracket (231) is provided with an arc-shaped body (2311), which is wrapped around the outside of the upper electrode (33) and detachably connected to the top of the carrier (212); The cover (232) is rotatably connected to the bracket (231) and makes conductive contact with it, and the cover (232) is placed on top of the upper electrode (33); The first movable contact (31) is rotatably connected to the bracket (231) and makes conductive contact, and the first movable contact (31) is also hooked to the cover (232); The return component (233) is disposed between the cover (232) and the bracket (231); The striker (32) of the current-limiting fuse assembly (3) is used to push the cover (232) to rotate when a large current passes through, so as to separate it from the first moving contact (31).

5. The full-range fuse according to claim 4, characterized in that, The connecting mechanism (23) further includes: a locking hook (234) and a locking shaft (235); wherein, The bottom of the cover (232) is provided with a circular limiting body (236), which covers the outside of the upper electrode (33). The end of the cover (232) facing the first moving contact (31) is provided with a locking hook (234). The first moving contact (31) is provided with a locking shaft (235) that is hooked to the locking hook (234).

6. The full-range fuse according to claim 5, characterized in that, The connecting mechanism (23) further includes: two conductive shafts (237); wherein, One end of the locking hook (234) connected to the cover (232) is rotatably connected to the bracket (231) via one of the conductive shafts (237); The first moving contact (31) is rotatably connected to the bracket (231) via another conductive shaft (237).

7. The full-range fuse according to claim 3, characterized in that, An arc-shaped positioning plate (213) is provided on one side of the bearing cylinder (211); The jet-type fuse drop-out assembly (4) is placed inside the positioning plate (213); The conductive frame (22) is disposed inside the bearing cylinder (211), and the conductive frame (22) is in conductive contact with the lower electrode (34) of the current-limiting fuse assembly (3) and the upper contact (42) of the jet-type fuse drop assembly (4).

8. The full-range fuse according to claim 7, characterized in that, The positioning mechanism (24) includes: a protective cover (241) and a positioning frame (242); wherein, The positioning frame (242) is disposed between the upper contact (42) and the arc suppression tube (43) of the jet-type fuse drop-out assembly (4); The protective cover (241) is detachably connected to the positioning plate (213), and the positioning frame (242) is sandwiched between the protective cover (241) and the positioning plate (213); The upper contact (42) is provided with a conductive cap (7), and the protective cover (241) covers the top of the conductive cap (7).

9. The full-range fuse according to claim 8, characterized in that, The upper contact (42) is disposed on the top of the positioning frame (242); The arc-extinguishing tube (43) is inserted into the groove (2421) at the bottom of the positioning frame (242); The positioning frame (242) has two limiting holes (2422) that communicate with the groove (2421). Two rivets (243) are respectively set in the two limiting holes (2422), and the distance between the two rivets (243) is smaller than the outer diameter of the arc-extinguishing tube (43) to clamp the arc-extinguishing tube (43).

10. The full-range fuse according to claim 7, characterized in that, Also includes: Insulating rubber sleeve (8); among which, The insulating sleeve (8) is fitted over the outside of the current-limiting fuse assembly (3) and placed inside the bearing cylinder (211); The main body of the conductive frame (22) is placed between the insulating sleeve (8) and the side wall of the bearing cylinder (211). The first end of the conductive frame (22) is in conductive contact with the lower electrode (34), and the second end of the conductive frame (22) is in conductive contact with the upper contact (42).

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