CN110970276A

CN110970276A - Drop-out fuse

Info

Publication number: CN110970276A
Application number: CN202010056307.9A
Authority: CN
Inventors: 郭晨; 章婧; 陈群; 郭文川; 王漳泉; 洪伟聪; 陈立
Original assignee: Tampa Fujian Electric Co ltd
Current assignee: Tampa Fujian Electric Co ltd
Priority date: 2020-01-18
Filing date: 2020-01-18
Publication date: 2020-04-07
Anticipated expiration: 2040-01-18
Also published as: CN110970276B; CN114203499B; CN114203499A

Abstract

The invention relates to a drop-out fuse, which comprises an insulator, a fuse tube, an upper electrode, a lower electrode, a mounting column, a side pushing device and a clamping device, wherein the upper electrode and the lower electrode are arranged at two ends of the insulator; the side pushing device is arranged on the mounting column, and the acting direction of the side pushing device points to the fuse tube; the clamping device is fixedly arranged on the mounting post and slides along the fuse tube, the clamping device has a closed state and an open state through being matched with the first step and the second step, the clamping device is buckled with the fixed protrusion when in the closed state and is separated from the fixed protrusion when in the open state, and the clamping device has a windproof function and is convenient for the fuse tube to fall rapidly to cut off a circuit rapidly.

Description

Drop-out fuse

Technical Field

The invention relates to the technical field of fuses, in particular to a drop-out fuse.

Background

The drop-out fuse is composed of an insulator and a fuse tube, an upper electrode connecting plate and a lower electrode connecting plate are respectively fixed above and below the insulator, a static contact and a rain shield are sequentially fixed on the upper electrode connecting plate, a main pressure spring is arranged between the static contact and the rain shield, a bracket, a trunnion matched with the bracket and a tripping device with a small spring are fixed on the lower electrode connecting plate, a fuse wire is arranged in the fuse tube, one end of the fuse wire is pressed through a pressure release cap arranged at the upper end of the fuse tube, the other end, opposite to the fuse wire, of the fuse wire is fixed on the lower electrode connecting plate through the tripping device, and the fuse wire is in a tensioned state.

In the existing product, when the drop-out fuse is in a working state, the static contact presses the pressure release cap under the action of the main pressure spring, one end of the fuse is pressed by the pressure release cap arranged at the upper end of the fuse tube body, and the other end of the fuse is fixed on the lower electrode connecting plate through the trip device and is in a tensioning state, so that the fuse tube body is in a normal closing state. When the power system has a fault, the fuse wire is quickly fused by fault current, after the fuse wire is fused, the trip device is quickly reset under the action of the small spring, the fuse wire tube body and the trunnion lose tension and turn down, and the fuse wire tube body is quickly dropped under the action of the dead weight of the fuse wire body under the pressure of the main compression spring on the static contact.

However, in some areas with high wind power, such as wind power plants, because the fuse tube body may be blown off by wind power under the condition of no fault due to the action of wind power, the existing drop-out fuse has to additionally add a constraint to the fuse tube body in order to have the function of wind prevention, which not only increases the switching-on difficulty of the operating rod, but also may prevent the fuse tube body from dropping when a fault really occurs, so that it is necessary to design a fuse which is convenient to switch on, has the function of wind prevention, and is also convenient for the fuse tube to drop quickly to cut off the circuit quickly.

Disclosure of Invention

In order to overcome the technical defects in the prior art, the invention provides the drop-out fuse which has a windproof function and is convenient for a fuse tube to drop quickly so as to cut off a circuit quickly.

The technical solution adopted by the invention is as follows: a drop-out fuse comprises an insulator, a fuse tube, an upper electrode, a lower electrode, a mounting column, a side pushing device and a clamping device, wherein the upper electrode and the lower electrode are arranged at two ends of the insulator, the upper electrode comprises an upper electrode connecting plate, a static contact, a main pressure spring and a rain shield, the upper electrode connecting plate is arranged at one end of the insulator, the static contact is electrically connected with the upper electrode connecting plate, the upper end of the fuse tube is electrically connected with the static contact, the lower end of the fuse tube is hung on the lower electrode and is electrically connected with the lower electrode, the rain shield is fixedly arranged on the upper electrode connecting plate and is positioned above the static contact, the main pressure spring is arranged between the static contact and the rain shield, the mounting column is fixedly arranged on the upper electrode connecting plate, and the fuse tube is provided with a first step, a second step and a fixing bulge; the side pushing device is arranged on the mounting column, and the acting direction of the side pushing device points to the fuse tube; the clamping device is fixedly arranged on the mounting column and slides along the fuse tube, the clamping device has two states of closing and opening through matching with the first step and the second step, and the clamping device is buckled with the fixing bulge when in the closing state and is separated from the fixing bulge when in the opening state.

As a further improvement of the invention, the clamping device comprises a clamping base fixedly mounted on the mounting column, and a pair of clamping jaws hinged to the clamping base through a hinge shaft and clamping two sides of the fuse tube, wherein the clamping jaws are elastic, the ends of the clamping jaws close to each other are extrusion ends, the ends of the clamping jaws far away from each other are fastening ends, the clamping jaws are connected with the mounting column through a tension spring, the action direction of the tension spring enables the extrusion ends of the two clamping jaws to respectively extrude the fuse tube, the fastening ends of the extrusion ends and the first step buckle the fixing bulges when extruding, and the fastening ends of the extrusion ends and the second step separate from the fixing bulges when extruding.

As a further improvement of the invention, the side-pushing device comprises a side-pushing elastic component and a side-pushing locking component, the side-pushing elastic component and the side-pushing locking component are both mounted on the mounting column, the side-pushing locking component and the side-pushing elastic component are detachably mounted, the acting direction of the side-pushing elastic component points to the fuse tube, the second step is provided with a trigger groove, and the side-pushing locking component is abutted against the trigger groove.

As a further improvement of the invention, the side-push elastic component comprises a push plate and a side-push pressure spring, one end of the push plate is hinged on the mounting column, the other end of the push plate is detachably connected with the side-push locking component and is propped against the fuse tube, and two ends of the side-push pressure spring are respectively connected with the push plate and the mounting column.

As a further improvement of the invention, the side-push locking assembly comprises a switch plate, a torsion spring and a stop block, wherein the stop block is fixedly arranged on the mounting column, the switch plate is arranged on the mounting column through the torsion spring, the action direction of the torsion spring enables the switch plate to abut against the stop block, the switch plate abuts against the trigger groove, the tail end of the switch plate is provided with a groove, and the side-push elastic assembly is detachably matched with the groove.

As a further improvement of the invention, the fuse tube comprises a fuse tube body, a pressure release cap, a fuse wire and a trunnion, the trunnion is provided with a wiring board, the pressure release cap is mounted at the upper end of the fuse tube body and is electrically connected with the static contact, the fuse wire is arranged in the fuse tube body, one end of the fuse wire is pressed by the pressure release cap arranged at the upper end of the fuse tube body, the other end of the fuse wire is fixed on the wiring board by a tripping device with a small spring, the trunnion is mounted at the lower end of the fuse tube body, the trunnion is hung on the lower electrode, and the wiring board is electrically connected with the lower electrode by the trunnion.

As a further improvement of the invention, the fuse tube body is a high-strength epoxy glass fiber tube.

As a further improvement of the invention, the inner cavity of the fuse tube body is a step-shaped expansion type cavity, the inner cavity of the fuse tube body is expanded step by step from the pressure release cap to the lower end of the fuse tube body, and the fuse tube body is single-ended and exhausts gas.

As a further improvement of the invention, an electroscopic grounding pull ring is fixed on the lower electrode and is positioned outside a fuse tube dropping path.

The invention has the beneficial effects that:

1: the rain shield is arranged above the static contact, the main pressure spring is arranged between the static contact and the rain shield, and the rain shield plays a role in protecting the static contact and the main pressure spring.

2: the clamping device is fixedly arranged on the mounting column and slides along the fuse tube, the clamping device has a closed state and an open state through being matched with the first step and the second step, and the clamping device is buckled with the fixing bulge when in the closed state and is separated from the fixing bulge when in the open state. Specifically speaking, before falling, the extrusion end is matched with the first step, and the buckling end is buckled with the fixing protrusion, so that the fuse tube body is ensured not to fall off when no fault exists, and the windproof function is realized. When the fuse tube body falls, the extrusion end slides along the fuse tube body and slides from the first step to be matched with the second step, the clamping jaw is embraced to rotate under the action of the tension spring, and the buckling end is separated from the fixed protrusion to be contacted when the extrusion end is matched with the second step, so that the limitation on the fuse tube body is removed, and the fuse tube body can fall rapidly to cut off a circuit rapidly.

3: the side pushing device comprises a mounting column, a side pushing elastic assembly and a side pushing locking assembly, wherein the side pushing elastic assembly and the side pushing locking assembly are both mounted on the mounting column, the side pushing locking assembly and the side pushing elastic assembly are detachably mounted, the acting direction of the side pushing elastic assembly points to the fuse tube, the second step is provided with a trigger groove, the side pushing locking assembly abuts against the trigger groove, the side pushing locking assembly and the side pushing elastic assembly are detached by the trigger groove when the fuse tube body falls, at the moment, the clamping device is in an open state due to the fact that the clamping device is matched with the second step, the fuse tube body is laterally pushed out under the action of the side pushing elastic assembly, the electrical connection between the static contact and the fuse tube can be quickly disconnected at the moment when the fuse is fused, the circuit is quickly disconnected, and the service life is prolonged.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Fig. 2 is an enlarged schematic view of a point a in fig. 1.

FIG. 3 is a schematic front view of the pressure relief cap end of the fuse tube.

FIG. 4 is a side view of the fuse tube pressure relief cap end.

Fig. 5 is a schematic view of the clamping device cooperating with the first step.

Fig. 6 is a schematic view of the clamping device and the second step.

Fig. 7 is a schematic diagram of the groove position.

Description of reference numerals: 11. a rain shield; 13. a main pressure spring; 15. a static contact piece; 17. an upper electrode connecting plate; 2. an insulator; 3. a fuse tube body; 31. a pressure release cap; 32. a trigger slot; 33. a first step; 34. a second step; 35. a fixed protrusion; 4. a lower electrode; 41. an electricity testing grounding pull ring; 42. a trip device; 43. a wiring board; 44. a trunnion; 5. a side pushing device; 51. pushing the plate; 52. laterally pushing the pressure spring; 53. a stopper; 54. a torsion spring; 55. a switch plate; 551. a groove; 56. mounting a column; 6. a clamping device; 61. a clamp base; 62. hinging a shaft; 63. clamping jaws are embraced; 631. extruding the end; 632. buckling ends; 64. a tension spring.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

as shown in fig. 1 to 7, the embodiment provides a drop-out fuse, which includes an insulator 2, a lower electrode 4, a mounting post 56, a side pushing device 5 and a clamping device 6, wherein an electricity testing grounding pull ring 41 is fixed on the lower electrode 4, and the electricity testing grounding pull ring 41 is located outside a fuse tube dropping path, so that when a fuse is blown down, the fuse tube does not touch the electricity testing grounding pull ring 41, the service life of the electricity testing grounding pull ring 41 is greatly prolonged, and the upper electrode and the lower electrode 4 are disposed at two ends of the insulator 2 and insulated by the insulator 2.

In this embodiment, the upper electrode includes an upper electrode connecting plate 17, a static contact 15, a main compression spring 13 and a rain shield 11, the upper electrode connecting plate 17 is installed at one end of the insulator 2, the installation column 56 is fixedly installed on the upper electrode connecting plate 17, the static contact 15 is electrically connected with the upper electrode connecting plate 17, the upper end of the fuse tube is electrically connected with the static contact 15, the lower end of the fuse tube is hung on the lower electrode 4 and is electrically connected with the lower electrode 4, the rain shield 11 is arranged above the static contact 15, the main compression spring 13 is arranged between the static contact 15 and the rain shield 11, and the rain shield 11 protects the static contact 15 and the main compression spring 13 above.

In this embodiment, the fuse tube includes a fuse tube body 3, a pressure release cap 31, a fuse wire and a trunnion 44, a wiring board 43 is disposed on the trunnion 44, the fuse tube body 3 is a high-strength epoxy glass fiber tube, an inner tube cavity of the fuse tube body 3 is a step-shaped expanding tube cavity, the inner tube cavity of the fuse tube body 3 expands from the pressure release cap 31 to the lower end of the fuse tube body 3 step by step, so as to provide an enough explosion space for a strong arc-extinguishing airflow which explodes instantaneously, thereby preventing the interior of the fuse tube body 3 from exploding suddenly under the impact of the strong airflow, and meanwhile, the fuse tube body 3 exhausts air for a downward single end, thereby preventing upward injection, causing unnecessary mechanical damage or short circuit, and greatly improving the performance of the fuse. The pressure release cap 31 is arranged at the upper end of the fuse tube body 3 and is electrically connected with the static contact piece 15, the fuse is arranged in the fuse tube body 3, one end of the fuse is pressed by the pressure release cap 31 arranged at the upper end of the fuse tube body 3, the other end of the fuse is fixed on a wiring board 43 through a tripping device 42 with a small spring and is in a tensioning state, so that the fuse tube body 3 is in a normal closing state, a trunnion 44 is positioned at the lower end of the fuse tube body 3, the trunnion 44 is hung on the lower electrode 4, and the wiring board 43 is electrically connected with the lower electrode 4 through the trunnion.

In this embodiment, the fuse tube 3 is provided with a first step 33, a second step 34 and a fixing protrusion 35, the clasping device 6 includes a clasping base 61 fixedly mounted on the mounting post 56, and a pair of clasping jaws 63 hinged to the clasping base 61 through hinge shafts 62 and clamping two sides of the fuse tube 3, the clasping jaws 63 slide along the fuse tube 3, the clasping jaws 63 have two states of closing and opening by cooperating with the first step 33 and the second step 34, and the clasping jaws 63 are engaged with the fixing protrusion 35 when in the closing state and disengaged from the fixing protrusion 35 when in the opening state.

Specifically, the one end that embraces clamping jaw 63 and is close to each other is extrusion end 631 respectively and the one end that keeps away from each other is buckle end 632, it is connected through extension spring 64 between clamping jaw 63 and the erection column 56 to embrace, extension spring 64 acts on the direction and makes two extrusion ends 631 of embracing clamping jaw 63 extrude fuse body 3 respectively, buckle end 632 buckles fixed protrusion 35 when extrusion end 631 extrudes with first step 33, buckle end 632 breaks away from fixed protrusion 35 when extrusion end 631 extrudes with second step 34, extrusion end 631 cooperates with first step 33 before falling, buckle end 632 buckle fixed protrusion 35 this moment, guarantee fuse body 3 can not fall when no trouble, have windproof function. When the fuse body falls, the pressing end 631 slides along the fuse body 3 and slides from the first step 33 to be matched with the second step 34, the clamping jaw 63 rotates under the action of the tension spring 64, the buckling end 632 is separated from the fixed protrusion 35 when the pressing end 631 is matched with the second step 34, the limitation on the fuse body 3 is removed, the fuse body 3 falls rapidly, and the circuit is cut rapidly.

In this embodiment, the side pushing device 5 includes a side pushing elastic component and a side pushing locking component, the side pushing elastic component and the side pushing locking component are both installed on the installation column 56, the side pushing locking component and the side pushing elastic component are detachably installed, the acting direction of the side pushing elastic component points to the fuse tube 3, the second step 34 is provided with a trigger groove 32, it is noted that the width of the trigger groove 32 is smaller than the width of the second step 34, and the extrusion end 631 cannot fall into the trigger groove 32 when sliding along the second step 34.

Wherein, the side push elastic component comprises a push plate 51 and a side push compression spring 52, one end of the push plate 51 is hinged on the mounting column 56, two ends of the side push compression spring 52 are respectively connected with the push plate 51 and the mounting column 56, the side push locking component comprises a switch plate 55, a torsion spring 54 and a stop 53, the stop 53 is fixedly arranged on the mounting column 56, the switch plate 55 is arranged on the mounting column 56 through the torsion spring 54, the action direction of the torsion spring 54 enables the switch plate 55 to be abutted against the stop 53, the switch plate 55 is abutted against the trigger groove 32, and the tail end of the switch plate is provided with a groove 551, when the fuse tube does not fall, the push plate 51 is inserted into the groove 551 and limited by the groove 551, when the fuse tube 3 falls, the trigger groove 32 drives the switch plate 55 to rotate, so that the push plate 51 is separated from the groove 551, the side push compression spring 52 acts to push the push plate 51 towards the fuse tube 3, the fuse tube 3 is pushed out along with the side, the circuit is cut off, the service life is prolonged, when the fuse tube body 3 is closed again after the overhaul is finished, the push plate 51 is extruded by the fuse tube body 3 and the push plate 51 rotates, the stop block 53 is pressed by the switch plate 55 under the action of the torsion spring 54, the inclined surface is arranged on the switch plate 55, the push plate 51 slides along the inclined surface and is inserted into the groove 551, the fuse tube body 3 cannot be extruded by the push plate 51 under the limitation of the groove 551 when the closing is finished, and the fuse tube body 3 is prevented from falling without faults under the pushing.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims

1. Drop out fuse, its characterized in that: the fuse comprises an insulator, a fuse tube, an upper electrode, a lower electrode, a mounting post, a side pushing device and a clamping device, wherein the upper electrode and the lower electrode are arranged at two ends of the insulator, the upper electrode comprises an upper electrode connecting plate, a static contact, a main pressure spring and a rain shield, the upper electrode connecting plate is arranged at one end of the insulator, the static contact is electrically connected with the upper electrode connecting plate, the upper end of the fuse tube is electrically connected with the static contact, the lower end of the fuse tube is hung on the lower electrode and is electrically connected with the lower electrode, the rain shield is fixedly arranged on the upper electrode connecting plate and is positioned above the static contact, the main pressure spring is arranged between the static contact and the rain shield, the mounting post is fixedly arranged on the upper electrode connecting plate, and the fuse tube is provided with a first step, a second step and a fixing bulge; the side pushing device is arranged on the mounting column, and the acting direction of the side pushing device points to the fuse tube; the clamping device is fixedly arranged on the mounting column and slides along the fuse tube, the clamping device has two states of closing and opening through matching with the first step and the second step, and the clamping device is buckled with the fixing bulge when in the closing state and is separated from the fixing bulge when in the opening state.

2. A drop out fuse as claimed in claim 1, wherein: embrace and press from both sides the device including adorning firmly the embrace press from both sides the base on the erection column, articulate through the articulated shaft and press from both sides on embracing the base and carry a pair of clamping jaw of embracing of fuse tube both sides, it all has elasticity to embrace the clamping jaw, the one end that embraces the clamping jaw and be close to each other is extrusion end respectively and the one end of keeping away from each other is the lock end, it is connected through the extension spring between clamping jaw and the erection column to embrace, extension spring effect direction makes two extrusion ends of embracing the clamping jaw extrude the fuse tube respectively, the lock end withholds fixed arch when extrusion end extrudees with first step, the lock end breaks away from fixed arch when extrusion end extrudees.

3. A drop out fuse as claimed in claim 1, wherein: the side pushes away the device and pushes away the hasp subassembly including the side, the side pushes away the elastic component and the side pushes away the hasp subassembly and all installs on the erection column, the side pushes away the hasp subassembly and pushes away elastic component detachably installation with the side, the side pushes away the directional fuse tube of elastic component direction of action, the second step is equipped with the trigger slot, the side pushes away the hasp subassembly and supports on the trigger slot.

4. A drop out fuse as claimed in claim 3, wherein: the side pushes away elastic component and includes the push pedal, the side pushes away the pressure spring, push pedal one end articulates on the erection column, push pedal other end detachably connects the side and pushes away the locking components and push up on the fuse tube, push pedal and erection column are connected respectively to the side push pressure spring both ends.

5. A drop out fuse as claimed in claim 3, wherein: the side pushes away the hasp subassembly and includes switch plate, torsional spring and dog, the dog is adorned on the erection column admittedly, the switch plate passes through the torsional spring and installs on the erection column, torsional spring effect direction makes the switch plate top lean on the dog, the switch plate supports on triggering the groove and the end is equipped with the recess, side pushes away elastic component detachably and recess cooperation.

6. A drop out fuse as claimed in claim 1, wherein: the fuse tube comprises a fuse tube body, a pressure release cap, a fuse wire and a trunnion, wherein a wiring board is arranged on the trunnion, the pressure release cap is arranged at the upper end of the fuse tube body and is electrically connected with a static contact, the fuse wire is arranged in the fuse tube body, one end of the fuse wire is compressed through the pressure release cap arranged at the upper end of the fuse tube body, the other end of the fuse wire is fixed on the wiring board through a tripping device with a small spring, the trunnion is arranged at the lower end of the fuse tube body, the trunnion is hung on a lower electrode, and the wiring board is electrically connected with the lower electrode through the trunnion.

7. The drop out fuse of claim 6, wherein: the fuse wire tube body is a high-strength epoxy glass fiber tube.

8. The drop out fuse of claim 7, wherein: the inner cavity of the fuse tube body is a stepped expansion type cavity, the inner cavity of the fuse tube body expands from the pressure release cap to the lower end of the fuse tube body step by step, and the fuse tube body is single-ended and exhausts.

9. A drop out fuse as claimed in claim 1, wherein: an electricity testing grounding pull ring is fixed on the lower electrode and is located outside a fuse tube dropping path.