CN115763186A - Drop-out fuse tube - Google Patents

Abstract

The invention belongs to the technical field of electric power operation and discloses a drop-out fuse tube, wherein the drop-out fuse tube comprises an upper sleeve, a fuse tube, a lower sleeve, a bottom bracket and an elastic driving assembly, the upper sleeve is abutted against a pressing sheet, and the fuse tube comprises a fuse tube body, a fuse wire and a waterproof sleeve. Wherein the fuse tube body can be dismantled and connect in the upper casing, and the fuse wears to locate the fuse tube body, and one end can be dismantled and connect in the upper casing, and waterproof jacket sets up between fuse and fuse tube body, and the fuse tube body outside is located to the lower casing cover, and the other end of fuse is connected in the bottom bracket, and elastic drive subassembly presss from both sides and locates between fuse tube body and the bottom bracket, is configured to drive bottom bracket and keeps away from the fuse tube body. The fuse wire is connected with the bottom bracket, so that the bottom bracket can apply acting force to the fuse wire, and the fuse wire can fall off quickly after being fused.

Description

Drop-out fuse tube

Technical Field

The invention relates to the technical field of electric power operation, in particular to a drop-out fuse tube.

Background

The drop-out fuse is a common short-circuit protection switch, when the drop-out fuse is installed on a 10kV distribution line branch line, the power failure range can be reduced, and the drop-out fuse has an obvious disconnection point and has the function of an isolating switch, so that a safe operation environment is created for lines and equipment at an overhaul section.

The drop-out fuse generally comprises a fusion tube, an upper cover groove, a lower support, an upper contact, a lower contact, a guide hook, an operating ring, a porcelain piece, a mounting bracket and the like. The fuse is usually disposed in the fuse tube, and the longer the fuse is used, the more the fuse will be scattered or broken. Particularly, when the drop-out fuse is used in a humid environment for a long time, plants such as moss are easily generated in the fuse tube to pollute the fuse tube, so that the service life of the fuse is shortened, and the fuse is frequently maintained.

Secondly, it is difficult to directly observe the quality of the fuse through the fuse tube or to judge the use state of the fuse during initial purchase or inspection. In the process of fusing the fuse, the fusing condition of the fuse cannot be found quickly to maintain the fuse, and if the fusing process of the fuse is long, the situation that the fuse is not completely fused and falls off exists, the phase-missing operation of the transformer can be caused, and the larger power utilization problem is caused.

Disclosure of Invention

The invention aims to provide a drop-out fuse tube, which is waterproof and moistureproof, is convenient for observing the state of a fuse wire and enables the fuse wire to drop out quickly after being fused.

In order to achieve the purpose, the invention adopts the following technical scheme:

drop out fuse-link, wherein, include:

the upper sleeve is abutted against the pressing sheet;

the fuse tube comprises a fuse tube body, a fuse wire and a waterproof sleeve, the fuse tube body is detachably connected with the upper sleeve, the fuse wire penetrates through the fuse tube body, one end of the fuse wire is detachably connected with the upper sleeve, and the waterproof sleeve is arranged between the fuse wire and the fuse tube body;

the lower sleeve is sleeved outside the fuse tube body;

a bottom bracket to which the other end of the fuse is connected;

and the elastic driving assembly is clamped between the fuse tube body and the bottom bracket and is configured to drive the bottom bracket to be far away from the fuse tube body.

Optionally, the waterproof sleeve includes a thermoplastic pipe, the thermoplastic pipe is sleeved outside the fuse, and one end of the thermoplastic pipe is detachably connected to the upper sleeve, and the other end of the thermoplastic pipe abuts against the bottom bracket.

Optionally, the waterproof casing further includes a drying tube, the drying tube is sleeved outside the thermoplastic tube, and one end of the drying tube is detachably connected to the upper casing, and the other end of the drying tube is slidably connected to the fuse tube body.

Optionally, the upper sleeve includes an upper sleeve body and an upper contact, the upper sleeve body is sleeved outside the fuse tube body, one end of the upper contact abuts against the pressing plate, and the other end of the upper contact is clamped into the fuse tube body and detachably connected to the fuse.

Optionally, the upper bushing further includes a position-limiting sleeve, and the position-limiting sleeve is sleeved outside the upper contact and is clamped into the fuse tube body.

Optionally, the fuse tube body is provided with an accommodating groove, the elastic driving assembly is slidably disposed in the accommodating groove, and the fuse is slidably connected to the elastic driving assembly.

Optionally, the elastic driving component includes a movable member, the movable member is slidably disposed in the accommodating groove along a length direction of the fuse, and the fuse is slidably connected to the movable member.

Optionally, the elastic driving assembly further includes a limiting post and an elastic element, one end of the limiting post is fixedly connected to the moving member, the other end of the limiting post is slidably connected to the fuse tube body, the elastic element is sleeved outside the limiting post, and two ends of the elastic element are respectively fixedly connected to the wall of the accommodating groove and the moving member.

Optionally, the elastic driving assembly further includes a supporting member, a sliding groove is disposed on the bottom bracket, one end of the supporting member is fixedly connected to the moving member, and the other end of the supporting member is slidably disposed in the sliding groove.

Optionally wherein the waterproof sleeve is made of a transparent material.

The invention has the beneficial effects that:

the waterproof sleeve is convenient for waterproof and moistureproof to the fuse wire in the fuse wire tube, so that the fuse wire tube and the fuse wire are prevented from being polluted by a damp environment, and the service life of the fuse wire is prolonged. The fuse wire is detachably connected with the upper sleeve, so that the upper sleeve can be conveniently detached, and the service condition and the quality state of the fuse wire can be observed. The fuse wire wears to locate the fuse tube body to be connected in the bottom bracket, and press from both sides between fuse tube body and bottom bracket and establish the elastic drive subassembly, the bottom bracket of being convenient for exerts the effort to the fuse wire, can make the fuse wire drop fast after fusing, and the operating personnel of being convenient for directly perceived discovery fuse's the situation that drops avoids transformer default phase operation problem.

Drawings

Fig. 1 is an overall structural view of a drop type fuse tube according to the present invention;

FIG. 2 is an enlarged view of A in FIG. 1;

FIG. 3 is an enlarged view of B in FIG. 1;

fig. 4 is a schematic structural view of the drop type fuse tube in a use state according to the present invention.

In the figure:

100-tabletting; 10-installing a sleeve; 20-a fuse tube; 30-casing; 40-a bottom bracket; 50-a resilient drive assembly; 11-upper sleeve body; 12-an upper contact; 13-a stop collar; 21-a fuse tube body; 22-a fuse; 23-a thermoplastic tube; 24-a drying tube; 401-a chute; 51-a movable member; 52-a limit post; 53-a resilient member; 54-a support.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts throughout, or parts having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The drop-out fuse is a common short-circuit protection switch, and comprises a fusion tube, an upper contact, a lower contact, a support, an operating ring, an installation support and the like. In some fuses which are arranged in a humid environment for a long time, moss and other plants are easy to generate in the fuse tube to pollute the fuse tube, and the service life of the fuse in the fuse tube is shortened. Secondly, it is difficult to directly observe the state of use and quality of the fuse in the fuse tube. After the fuse is fused, the power utilization problem that the transformer runs in a phase-lacking mode due to incomplete falling exists.

Example one

The technical solution of the present embodiment is further described by the following detailed description with reference to the accompanying drawings.

As shown in fig. 1 to 4, the present embodiment provides a drop type fuse tube including an upper bushing 10, a fuse tube 20, a lower bushing 30, a bottom bracket 40, and an elastic driving assembly 50. Wherein go up sleeve pipe 10 butt in preforming 100, fuse tube 20 includes fuse tube body 21, fuse 22 and waterproof sleeve pipe, and fuse tube body 21 can be dismantled and connect in last sleeve pipe 10, and fuse 22 wears to locate fuse tube body 21, and one end can be dismantled and connect in last sleeve pipe 10, and waterproof sleeve pipe sets up between fuse 22 and fuse tube body 21. The lower sleeve 30 is sleeved outside the fuse tube body 21, and the other end of the fuse 22 is connected to the bottom bracket 40. The resilient drive assembly 50 is interposed between the fuse tube body 21 and the bottom bracket 40, and is configured to drive the bottom bracket 40 away from the fuse tube body 21.

In this embodiment, the waterproof sleeve is provided to facilitate the waterproof and moisture-proof of the fuse 22 in the fuse tube 20, so as to avoid the pollution of the moist environment to the fuse 22 and prolong the service life of the fuse 22. The removable connection between the fuse 22 and the upper sleeve 10 facilitates removal of the upper sleeve 10 and observation of the fuse 22 usage and quality. Fuse 22 wears to locate fuse tube body 21 to be connected in bottom bracket 40 to press from both sides between fuse tube body 21 and bottom bracket 40 and establish elastic drive assembly 50, be convenient for bottom bracket 40 and exert the effort to fuse 22, can make fuse 22 drop fast after fusing, the operating personnel can directly perceivedly discover fuse 22's the situation that drops, avoids transformer default phase operation problem.

The overall structure of the drop type fuse tube of the present embodiment will be explained.

As shown in fig. 1, the drop-out fuse tube mainly includes an upper bushing 10, a fuse tube 20, a lower bushing 30, a bottom bracket 40, and an elastic driving assembly 50.

In this embodiment, one end of the upper bushing 10 abuts against the pressing plate 100, and the other end is detachably connected to the fuse tube 20. The other end of the fuse tube 20 is sleeved with a lower sleeve 30. The bottom bracket 40 is connected to the fuse tube 20, and the elastic driving assembly 50 is interposed between the bottom bracket 40 and the fuse tube 20. The upper and lower bushings 10, 30 close both ends of the fuse tube 20, and the fuse tube 20 is further connected to the bottom bracket 40 by the elastic driving assembly 50.

As shown in fig. 2, the upper bushing 10 includes an upper bushing body 11, an upper contact 12, and a position-limiting sleeve 13.

Optionally, the upper casing body 11 is provided as an annular cylindrical structure, and the upper casing body 11 is provided with a through hole therethrough. In the present embodiment, the upper bushing body 11 is sleeved outside the fuse tube 20, and the diameter of the through hole is equal to the outer diameter of the fuse tube 20. Specifically, the upper bushing body 11 is fixedly connected to the outer side of the fuse tube 20, so as to protect the fuse tube 20 and improve the connection strength between the fuse tube 20 and other components.

The upper contact 12 is configured such that one end is snap-fitted into the fuse tube 20 and the other end abuts against the pressing plate 100. Therefore, a circuit path is formed between the pressing sheet 100 and the fuse tube 20, the upper contact 12 is detached in a clamping connection mode, the internal condition of the fuse tube 20 can be observed conveniently, the fuse tube of the drop-out fuse tube is subjected to selective inspection, the purchase cost is reduced, and in the long-term use process, the internal part of the fuse tube 20 can be monitored in real time by detaching the upper contact 12, and maintenance and replacement are performed in time.

Further, as shown in fig. 2, one end of the upper contact 12 is provided with a step groove, when the upper contact 12 is clamped into the fuse tube 20, the step groove is arranged to be close to the fuse tube 20, the end face of the step groove is higher than the end face of the fuse tube 20, and the bottom face of the step groove is lower than the end face of the fuse tube 20.

In this embodiment, the position limiting sleeve 13 is arranged to be sleeved outside the upper contact 12 and to be clamped into the fuse tube 20.

Specifically, the position limiting sleeve 13 is provided with an annular structure, the inner diameter of the position limiting sleeve 13 is not smaller than the outer diameter of the upper contact 12 at the position where the stepped groove is provided, and the outer diameter of the position limiting sleeve 13 is slightly larger than the inner diameter of the fuse tube 20, so that the position limiting sleeve 13 is in interference connection with the fuse tube 20, and the upper contact 12 is limited.

Optionally, when the position-limiting sleeve 13 is sleeved outside the upper contact 12, one end face of the position-limiting sleeve 13 abuts against the bottom surface of the stepped groove, the other end face of the position-limiting sleeve 13 is parallel to the end face of the stepped groove, and the outside of the position-limiting sleeve 13 is tightly attached to the fuse tube 20. The position-limiting sleeve 13 is clamped between the upper contact 12 and the fuse tube 20, and the position of the upper contact 12 clamped in the fuse tube 20 is limited and fixed.

Furthermore, a threaded connection is arranged between the limiting sleeve 13 and the upper contact 12, so that the upper contact 12 is convenient to remove, and the position of the upper contact 12 is limited and fixed when the upper contact is not removed.

As shown in fig. 2, the fuse tube 20 includes a fuse tube body 21, a fusing filament 22, a thermoplastic tube 23, and a dry tube 24.

In this embodiment, the fuse tube body 21 is provided as a cylindrical structure, and one end of the fuse tube body 21 is provided as a sleeved end and the other end is provided as a closed end. Wherein the upper bushing 10 is detachably connected to the sleeving end of the fuse tube body 21. Specifically, the upper sleeve body 11 of the upper sleeve 10 is sleeved outside the sleeving end of the fuse tube body 21, so that the upper sleeve body 11 and the sleeving end of the fuse tube body 21 are fixedly connected.

Optionally, the sleeving end of the fuse tube body 21 is provided with a sleeving hole in a through manner, and the sealing end plugs the sleeving hole. As shown in fig. 2, the upper contact 12 and the position-limiting sleeve 13 are clamped into the fuse tube body 21, the stepped groove of the upper contact 12 abuts against the side wall of the sleeving hole of the fuse tube body 21, and the position-limiting sleeve 13 is clamped between the upper contact 12 and the side wall of the sleeving hole, so that the position-limiting fixation of the upper contact 12 and the fuse tube body 21 is realized.

Further, the fuse 22 is inserted into the fuse tube body 21, and one end of the fuse 22 is detachably connected to the upper bushing 10, and in this embodiment, the fuse 22 is detachably connected to the upper contact 12. Specifically, one end of the fuse 22 is provided with a buckle, one end of the upper contact 12 connected with the fuse 22 is provided with a groove, and the buckle of the fuse 22 is arranged to extend into the groove and abut against the bottom of the groove.

Optionally, the other end of the fuse 22 is attached to the bottom bracket 40. Specifically, the closed end of the fuse tube body 21 is provided with a through hole. The through holes are provided penetrating in the longitudinal direction of the fuse tube body 21. The through hole is communicated with the sleeve hole, and the diameter of the through hole is smaller than that of the sleeve hole and larger than that of the fuse wire 22.

The fuse 22 is inserted through the receiving hole and the passing hole in order and connected to the bottom bracket 40. Realize the sliding connection between fuse 22 and the fuse tube body 21 for the motion of fuse 22 is not influenced by fuse tube body 21, can remove in cup joint hole and clearing hole after fuse 22 melts, drops in the fuse tube body 21 from the fuse tube body fast, reduces the power consumption problem of transformer default phase operation.

Specifically, a waterproof bushing is provided between the fuse 22 and the fuse tube body 21. The waterproof sleeve is sleeved outside the fuse 22, one end of the waterproof sleeve is detachably connected to the upper sleeve 10, and the other end of the waterproof sleeve is slidably connected to the fuse tube body 21. The waterproof sleeve can move in the fuse tube body 21 synchronously with the fuse 22, so that the fuse 22 can be conveniently fused and fall off.

Further, the waterproof jacket includes a thermoplastic pipe 23 and a dry pipe 24. In the present embodiment, the thermoplastic tube 23 is sleeved outside the fusing filament 22, and as shown in fig. 2 and 3, the inner diameter of the thermoplastic tube 23 is slightly larger than the outer diameter of the fusing filament 22, so as to cover the fusing filament 22.

Alternatively, the material of the thermoplastic tube 23 is provided as a heat shrinkable material. Can produce more heat in the fuse 22 working process, the thermal plasticity pipe 23 is heated the shrink, strengthens the parcel effect to fuse 22 to this avoids fuse 22 to appear pine strand or disconnected strand phenomenon, when fuse 22 fuses and drops, also can guarantee that fuse 22 is whole complete, makes fuse 22 can wholly drop from fuse pipe body 21.

Further, the thermoplastic tube 23 has one end detachably connected to the upper sleeve 10 and the other end abutting against the bottom bracket 40. Specifically, as shown in fig. 2, the thermoplastic tube 23 is disposed within the recess of the upper contact 12 against the snap of the fuse 22.

Alternatively, as shown in fig. 3, the diameter of the passing hole of the fuse tube body 21 is larger than the outer diameter of the thermoplastic tube 23, and the thermoplastic tube 23 is inserted through the socket hole and the passing hole in order to abut on the bottom bracket 40.

As shown in fig. 2 and 3, the drying pipe 24 is sleeved outside the thermoplastic pipe 23, and one end of the drying pipe 24 is detachably connected to the upper sleeve 10, and the other end is slidably connected to the fuse tube body 21. Specifically, the inner diameter of the drying tube 24 is larger than the outer diameter of the thermoplastic tube 23, and the outer diameter of the drying tube 24 is smaller than the inner diameter of the sleeving hole of the fuse tube body 21, so that the sliding connection between the drying tube 24 and the fuse tube body 21 is realized.

Optionally, the drying tube 24 is removably attached to the upper contact 12 of the upper sleeve 10. In the present embodiment, the outer diameter of the drying duct 24 is the same as the inner diameter of the groove. The end of the drying tube 24 connected with the upper contact 12 is provided with an external thread, the inner wall of the groove of the upper contact 12 is provided with an internal thread, and the drying tube 24 and the thread on the groove are mutually screwed. Namely, the drying pipe 24 and the upper contact 12 are detachably connected through a screw connection mode.

Further, after the drying tube 24 is screwed with the upper contact 12, the drying tube presses against the bottom surface of the fuse 22, which is snapped into the groove of the upper contact 12, so that the fuse 22 is tightly contacted with the upper contact 12, and the fuse 22 is detachably connected with the upper contact 12, in other embodiments, the fuse 22 may be detachably connected with the upper sleeve 10 in other manners.

Alternatively, the drying tube 24 is provided in a structure in which the drying agent is compression-molded, and the inner wall surface of the drying tube 24, that is, the contact surface of the drying tube 24 with the thermoplastic tube 23, is plated with an insulating and waterproof layer. Through the waterproof layer and the desiccant material, the effects of effective water and moisture prevention, insulation and support can be achieved, so that when the drop-out fuse tube is in a rainy season with more rainwater or is in a humid environment for a long time, plants such as moss growing in the fuse tube 20 can be avoided, the service lives of the fuse tube 20 and the internal fuse 22 are prolonged, and the failure rate of the device is reduced.

Specifically, in the present embodiment, the thermoplastic pipe 23 and the drying pipe 24 in the waterproof jacket are made of a transparent material, and the fuse tube body 21 is also made of a transparent material, so that it is convenient for a constructor to directly observe the operation state of the fuse 22.

As shown in fig. 3, the lower casing 30 is provided in an annular cylindrical configuration. In the present embodiment, the lower bushing 30 is sleeved outside the fuse tube 20. Specifically, the lower sleeve 30 is fixedly connected to the outer side of the closed end of the fuse tube body 21, so that the fuse tube 20 is protected, and the connection strength between the fuse tube 20 and other parts is improved.

As shown in fig. 4, bottom bracket 40 includes added springs, elongated spring clamps, and fastening screws. The additional spring is permanently welded with the lower sleeve 30, after the fuse wire 22 is arranged in the fuse tube body 21 in a penetrating mode, the tail end of the fuse wire 22 is fixedly connected below the lengthened spring pressing plate through a fastening screw.

Specifically, when the fuse is fixed, the lengthened spring pressing plate is additionally provided with a spring to compress, and the lengthened spring pressing plate is actually in an energy storage state and provides a rear-quilt elastic force for normal falling of the switch. Furthermore, the fuse wire 22 sequentially passes through the fuse tube body 21, the additionally-installed spring and the gap of the lengthened spring pressing plate, and is fixedly arranged on the lengthened spring pressing plate through fastening screws in a reinforcing mode.

In this embodiment, the extended spring pressing plate is further provided with a sliding slot 401, and the elastic driving component 50 is slidably disposed in the sliding slot 401, so as to achieve the connection between the elastic driving component 50 and the bottom bracket 40.

Further, the resilient drive assembly 50 is interposed between the fuse tube body 21 and the bottom bracket 40, and is configured to drive the bottom bracket 40 away from the fuse tube body 21. Optionally, the fuse 22 and thermoplastic tube 23 are slidably connected to the resilient drive assembly 50 and the drying tube 24 abuts the resilient drive assembly 50. The elastic driving assembly 50 is provided in a structure having a certain elasticity.

Specifically, the lengthened spring pressing plate provides support for the elastic driving assembly 50 through the sliding groove 401, and compresses the elastic driving assembly 50, so that energy storage for the fuse wire 22 is realized, after the fuse wire 22 is fused, the fuse wire 22 can be quickly disconnected under the elastic action of the elastic driving assembly 50, the upper sleeve 10 loses support, and can be disconnected with the pressing plate 100 and slide down along the inner wall of the fuse tube body 21. Therefore, the problem that the fuse wire 22 does not fall off after being fused can be reduced, and the fused condition of the fuse wire 22 can be conveniently and visually judged by an operator to be maintained and replaced in time.

Furthermore, the fuse wire 22 is attached to the outer part of the lengthened spring pressing plate through a fastening screw, stretched and then pressed and fixed, so that secondary energy storage of the fuse wire 22 is realized, and the fuse wire 22 is further enhanced to be rapidly separated from the fuse tube body 21 after being fused.

Example two

The present embodiment provides a drop type fuse tube, wherein the same or corresponding parts as or to the first embodiment are given the same reference numerals as the first embodiment. For the sake of simplicity, only the differences between the second embodiment and the first embodiment will be described. The difference lies in that:

in this embodiment, the closed end of the fuse tube body 21 is provided with an accommodating groove therein, and the through hole of the fuse tube body 21 is communicated with the accommodating groove. As shown in fig. 3, the elastic driving component 50 is slidably disposed in the accommodating slot.

Specifically, the elastic driving assembly 50 includes a movable member 51, a limiting post 52, an elastic member 53 and a supporting member 54. The movable element 51 is slidably disposed in the accommodating groove along the length direction of the fuse 22, and the fuse 22 is slidably connected to the movable element 51.

Alternatively, the movable element 51 is provided in a plate-like structure, and the movable element 51 is provided with a through hole, and the through hole are located on the same axis. The fuse 22 can be inserted into the through hole, and moved in the receiving groove, and dropped from the through hole after being fused. Specifically, the fuse 22 and the thermoplastic tube 23 are slidably connected to the through hole of the movable element 51, and the drying tube 24 abuts on the movable element 51.

Furthermore, one side of the movable element 51 is fixedly connected with a limiting column 52 and an elastic element 53, and the other side is fixedly connected with a supporting element 54. In the present embodiment, the two position-limiting columns 52 are symmetrically disposed on the movable element 51 and disposed on two sides of the fuse 22. Further, the other ends of the two limiting columns 52 are slidably connected to the fuse tube body 21, so that the movable member 51 can stably slide in the accommodating groove and is not easy to deflect.

Further, the elastic member 53 is sleeved outside the position-limiting column 52, and two ends of the elastic member are respectively and fixedly connected to the wall of the accommodating groove and the movable member 51. The elastic member 53 applies a pushing force or a pulling force to the movable member 51, thereby facilitating the restoration of the movable member 51 and the energy storage in a compressed state.

In the present embodiment, the elastic member 53 is provided as a spring, but other structures with elastic effect may be provided in other embodiments.

Optionally, the support 54 is disposed on the side of the movable member 51 near the bottom bracket 40. One end of the supporting member 54 is fixed to the movable member 51, and the other end is slidably disposed in the sliding slot 401. When the supporting member 54 slides in the sliding groove 401 toward the fuse tube body 21, the movable member 51 is forced to compress the elastic member 53, and the position-limiting column 52 slides in the accommodating groove and presses against the drying tube 24.

Specifically, after the thermoplastic tube 23 is sleeved outside the fuse wire 22, the fastening end of the fuse wire 22 abuts against the bottom of the groove of the upper contact 12, the drying tube 24 is sleeved outside the thermoplastic tube 23 and screwed in the groove of the upper contact 12, the other end of the drying tube 24 abuts against the movable element 51, the other end of the thermoplastic tube 23 abuts against the lengthened spring pressing plate, the fuse wire 22 is tightly attached to the outside of the lengthened spring pressing plate, and the tail end of the fuse wire 22 is fastened by fastening screws. And meanwhile, the supporting piece 54 is abutted against the sliding groove 401 of the lengthened spring pressing plate, so that the integral installation of the device is completed.

After the installation is completed, the lengthened spring pressing plate is pressed tightly, so that the supporting piece 54 slides upwards in the sliding groove 401, the movable piece 51 is pushed to compress the elastic piece 53 upwards in the accommodating groove, and the limiting column 52 slides inside the fuse tube body 21.

Under the action of the elastic member 53, the fuse wire 22 is provided with energy storage for one time, and after the fuse wire 22 is fused, the energy storage can be quickly released, so that the movable member 51 is popped downwards for a certain distance, and the quick disconnection between the upper contact 12 and the pressing sheet 100 is facilitated. At the same time the support 54 pushes the extension spring platen downward, so that the fuse is completely released.

Optionally, after the fuse wire 22 is stretched by the fastening screw against the outer part of the lengthened spring pressing plate, the tail end of the fuse wire 22 can be pressed and fixed to provide secondary energy storage for the fuse wire 22, and the fuse wire 22 can be rapidly accommodated in the fuse tube body 21 to fall off after being blown.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. Drop out fuse-link, its characterized in that includes:

an upper sleeve (10), wherein the upper sleeve (10) is abutted to the pressing sheet (100);

the fuse tube (20) comprises a fuse tube body (21), a fuse wire (22) and a waterproof sleeve, the fuse tube body (21) is detachably connected to the upper sleeve (10), the fuse wire (22) penetrates through the fuse tube body (21), one end of the fuse wire (22) is detachably connected to the upper sleeve (10), and the waterproof sleeve is arranged between the fuse wire (22) and the fuse tube body (21);

the lower sleeve (30), the said lower sleeve (30) is fitted over the outside of the said fuse tube body (21);

a bottom bracket (40), the other end of the fuse wire (22) being connected to the bottom bracket (40);

an elastic drive assembly (50) interposed between the fuse tube body (21) and the bottom bracket (40) configured to drive the bottom bracket (40) away from the fuse tube body (21).

2. The drop type fuse tube according to claim 1, wherein the waterproof sleeve comprises a thermoplastic tube (23), the thermoplastic tube (23) is sleeved outside the fuse wire (22), one end of the thermoplastic tube is detachably connected to the upper sleeve (10), and the other end of the thermoplastic tube abuts against the bottom bracket (40).

3. The drop-out fuse tube according to claim 2, wherein the waterproof sleeve further comprises a drying tube (24), the drying tube (24) is sleeved outside the thermoplastic tube (23), and one end of the drying tube is detachably connected to the upper sleeve (10) while the other end is slidably connected to the fuse tube body (21).

4. The drop type fuse tube according to claim 1, wherein the upper bushing (10) includes an upper bushing body (11) and an upper contact (12), the upper bushing body (11) is sleeved outside the fuse tube body (21), one end of the upper contact (12) abuts against the pressing plate (100), and the other end is clamped into the fuse tube body (21) and is detachably connected to the fuse wire (22).

5. The drop-out fuse tube according to claim 4, wherein the upper bushing (10) further comprises a stop collar (13), the stop collar (13) being sleeved outside the upper contact (12) and being clamped into the fuse tube body (21).

6. The drop-out fuse tube according to claim 1, characterized in that the fuse tube body (21) is provided with a receiving groove in which the elastic drive assembly (50) is slidably disposed, the fuse wire (22) being slidably connected to the elastic drive assembly (50).

7. The drop type fuse tube according to claim 6, wherein the elastic driving component (50) comprises a movable member (51), the movable member (51) is slidably limited in the containing groove along the length direction of the fuse wire (22), and the fuse wire (22) is slidably connected to the movable member (51).

8. The drop-out fuse tube according to claim 7, wherein the elastic driving assembly (50) further comprises a limiting column (52) and an elastic member (53), one end of the limiting column (52) is fixedly connected to the movable member (51), the other end of the limiting column is slidably connected to the fuse tube body (21), the elastic member (53) is sleeved outside the limiting column (52), and two ends of the elastic member are respectively fixedly connected to the wall of the accommodating groove and the movable member (51).

9. The drop type fusible link as claimed in claim 8, wherein the elastic driving assembly (50) further comprises a supporting member (54), the bottom bracket (40) is provided with a sliding slot (401), one end of the supporting member (54) is fixedly connected to the movable member (51), and the other end is slidably disposed in the sliding slot (401).

10. A drop fuse tube according to any one of claims 1-9, characterized in that the watertight casing is made of a transparent material.

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