WO2023015842A1

WO2023015842A1 - Nested excitation protection apparatus for breaking conductor and melt

Info

Publication number: WO2023015842A1
Application number: PCT/CN2022/071404
Authority: WO
Inventors: 戈西斌; 段少波; 王欣
Original assignee: 西安中熔电气股份有限公司
Priority date: 2021-08-09
Filing date: 2022-01-11
Publication date: 2023-02-16

Abstract

Provided is a nested excitation protection apparatus for breaking a conductor (207) and a melt (211, 311), comprising a housing, an excitation source (201), an impact apparatus (203), the conductor (207), and the melt (211, 311) connected in parallel with the conductor (207). A nested protection apparatus is provided at a pre-break of the melt (211) below a pre-break (208) of the conductor (207). The nested protection apparatus at the pre-break of the melt (211) is provided with an accommodating cavity (316) into which a broken part of the conductor (207) falls. The shape of the accommodating cavity (316) matches the shape of the broken part of the conductor (207). Under the driving of the impact apparatus (203), the broken part of the conductor (207) may push the nested protection apparatus to break the melt (211). With regards to the excitation protection apparatus, by means of providing the nested protection apparatus, an arc may be prevented from re-igniting at the break of the conductor (207) while the arc extinguishing capabilities are improved.

Description

An Exciting Protection Device for Interrupting Conductor and Melt in Nested Type

Cross References to Related Applications

This application is required to be submitted to the State Intellectual Property Office of China on August 9, 2021. The application number is 202110909388.7, and the name is "A Nested Excitation Protection Device for Interrupting Conductors and Melts" and it was submitted on August 9, 2021. The priority of the Chinese patent application with the application number 202121845764.2 titled "A Nested Excitation Protection Device for Interrupting Conductors and Melts" of the State Intellectual Property Office of China, the entire contents of which are incorporated in this application by reference.

technical field

The present application relates to an excitation protection device for interrupting conductors and melts in nested form.

Background technique

In addition to traditional thermal fuses, electric vehicle battery pack protection devices in the related art already have a protective structure for quickly cutting off circuits, that is, excitation fuses, and their application scope is gradually expanding. The traditional fuse is a protective device that uses the heat accumulation effect of the current to make the current sensing point (narrow neck) set by the melt melt and disconnect and extinguish the arc within a certain period of time. The excitation fuse is a fast protection device that cuts off the conductor by mechanical force in a short time and forms a physical fracture in the circuit.

The advantages of traditional fuses are maturity and stability, high breaking limit, and strong arc extinguishing ability. The disadvantages are: poor current impact resistance; large heat generation; it takes a long time to disconnect the circuit under low multiple fault currents, and cannot achieve fast protection. ; After the fuse is blown, it cannot achieve complete physical isolation, which is mainly reflected in the small value of the insulation resistance after breaking, and the value ranges from 0.1MΩ to 50MΩ; the volume and weight are relatively large. The advantage of the excitation fuse is that it can realize fast protection by quickly cutting the opening, good current impact resistance, small heat generation, complete physical isolation can be realized after disconnection, and the value range of insulation resistance after disconnection is above 550MΩ; , the upper limit of breaking is not high, and the arc extinguishing ability is weak (depending on air cooling or extrusion arc extinguishing).

Combining the advantages and disadvantages of the fuse and the excitation fuse, there has been a scheme to improve the arc extinguishing ability and breaking ability by connecting the fuse on the conductor of the excitation fuse in parallel, and on this basis, a better scheme has emerged, that is, sequentially An energizing fuse that interrupts a conductor and a melt connected in parallel with the conductor. Under the small multiple fault current, the scheme mainly uses the interruption of the conductor to disconnect the circuit, and the melt is not fused but only cut off; under the medium multiple fault current, the conductor is interrupted first, the current is transferred to the melt, and the melt starts to fuse. Cut off the melt during the fusing process and accelerate arc extinguishing and breaking; under a large multiple of fault current, the conductor is first interrupted, the current is transferred to the melt, and the melt is completely fused quickly, and finally the fuse is interrupted without current , to achieve complete physical isolation.

The problems with this excitation fuse of the related art are at least:

1. The conductor is exposed to the air before and after breaking. After the conductor is interrupted under the condition of large fault current, if the melt fuses too quickly, the arc re-ignition is likely to occur at the conductor fracture.

2. After breaking, the conductor fracture lacks protection, and it is easy to be polluted by leaked gunpowder gas or substances burned by the arc, resulting in a decrease in insulation performance.

3. The conductor fracture lacks sealing, and the insulation is established entirely by the air medium. The insulation establishment is greatly affected by the outside world. In high-temperature, high-humidity, and high-altitude areas, it may not be able to effectively cooperate with the arc-extinguishing melt, resulting in breaking failure.

Contents of the invention

The present application provides an excitation protection device for nested interrupted conductor and melt that at least solves the above-mentioned technical problems in the related art, and effectively seals and protects the pre-fracture of the conductor. After the conductor is broken, the current flows through the parallel melt. At this time, the nested protective structure on the conductor quickly and effectively seals and protects the conductor fracture, and quickly establishes insulation. Due to the rapid establishment of insulation at the conductor fracture, a smaller arc extinguishing melt can be used and faster fusing is allowed without excessive overvoltage causing arc re-ignition at the conductor fracture. At the same time, the interrupted part of the melt can also be protected to further enhance the breaking ability of the melt.

The present application provides an excitation protection device for nested interrupted conductors and melt, which may include a shell, an excitation source, an impact device, a conductor, and The melt with parallel conductors is characterized in that a nesting protection device can be provided at the melt pre-fracture below the conductor pre-fracture, and a supply conductor can be provided on the nesting protection device at the melt pre-fracture. The accommodating cavity where the disconnected part falls into; the accommodating cavity matches the shape of the conductor disconnected part; driven by the impact device, the conductor disconnected part can push the nesting protection device to disconnect melt. In this way, a nested excitation protection device for interrupting conductors and melts provided by the present application can at least solve the above-mentioned technical problems existing in the related art.

Optionally, the nesting protection device at the pre-fracture of the melt may include two nesting protection blocks oppositely arranged, and the nesting protection blocks are respectively arranged at intervals at the pre-fracture of the melt; The accommodating cavity may be formed between the blocks.

Optionally, an auxiliary arc extinguishing groove may be provided at the bottom of the housing below each nested protection block; the lower end of the nested protection block may be located at the opening of the auxiliary arc extinguishing groove.

Optionally, a rib may be provided at the bottom of the housing, and an auxiliary arc extinguishing structure may be set up on the rib; the auxiliary arc extinguishing structure and the auxiliary arc extinguishing structure located on both sides The side wall of the chamber where the structure is located forms the auxiliary arc extinguishing groove.

Optionally, the nesting protection device at the pre-fracture of the melt may include two nesting protection blocks that are relatively nested on the upper and lower sides of the pre-fracture of the melt; The accommodating cavity may be provided on the nesting protection block.

Optionally, at least one arc extinguishing chamber may be provided on the nesting protection device at the pre-fracture of the melt, the arc extinguishing chamber may be filled with an arc extinguishing medium, and the melt may pass through through the arc extinguishing chamber.

Optionally, at least one arc extinguishing chamber is arranged at intervals on the nesting protection device on the melt; The opening is away from the vertical groove of the conductor, and a melt-embedded cut-off block may be arranged in the vertical groove, and a gap may remain between the top of the melt-embedded cut-off block and the top of the vertical groove Movement gap, the lower end of which protrudes out of the nesting protection device at the pre-fracture of the melt; The melts on the sides can be respectively provided with breaking weak points.

Optionally, a nested protection device covering the conductor pre-fracture may be provided at the conductor pre-fracture.

Optionally, the nesting protection device at the conductor pre-fracture may include nesting protection blocks relatively nested on the upper and lower sides of the conductor pre-fracture.

Optionally, the housing may include an upper housing, a lower housing and a bottom cover, the conductor may be located between the upper housing and the lower housing, and the bottom cover may close the lower housing; The lower shells on both sides of the nesting protection device at the pre-fracture of the melt can be respectively provided with melt arc-extinguishing chambers for the melt to pass through, and the melt arc-extinguishing chambers can be filled with Arc extinguishing medium.

Optionally, an upper housing cavity that passes through the upper end and the lower end of the upper housing may be opened in the upper housing, and in the upper housing cavity on the side of the conductor in turn The impact device and the excitation source are provided, the excitation source may be an electronic ignition device, and the impact device may be located between the excitation source and the conductor.

Optionally, several limit projections may be arranged at intervals on the outer peripheral surface of the impact device, and an opening configured for initial positioning of the impact device may be opened on the wall of the upper housing cavity. The position is limited by the limit groove.

Optionally, the shape of the limiting protrusion may be a pointed structure inclined upwards.

Optionally, a lower housing cavity may be opened on the lower housing below the pre-fracture of the conductor, and the lower housing cavity may penetrate the upper end surface and the lower end surface of the lower housing. , the cavity of the lower housing may be a stepped cavity structure, and the width above the step may be greater than the width below the step.

Optionally, the side wall of the melt arc extinguishing chamber through which the melt passes may be provided with a slope structure; the melt in the arc extinguishing material on the side close to the slope structure may be provided with a disconnection At the weak point, when the nesting protection device on the melt is pushed to move downward, the melt is broken at the weak point.

Optionally, a through-hole slot for the melt to pass through may be opened on the housing wall between the melt arc extinguishing chamber and the conductor, and the two ends of the melt may respectively pass through the After the through-hole slot, it is connected in parallel with the conductor.

Optionally, a buffer device for buffering after the melt is broken may be provided on the bottom cover.

Optionally, the material of the nested protection device and the auxiliary arc extinguishing structure may be a material that can generate arc extinguishing gas when heated.

The nested protection device for interrupting the conductor and melt of the present application quickly uses the nested protection device at the conductor to protect the conductor fracture and establish insulation after the conductor is interrupted, so as to prevent the arc from re-igniting at the conductor fracture; It can only flow through the parallel melt, and the impact device drives the disconnected part of the conductor to continue to disconnect the melt, forming at least one mechanical fracture on the melt, and then nesting the protective device at the melt to assist the arc extinguishing medium to further extinguish the arc , Improved breaking capacity and arc extinguishing capacity.

With the nested structure on the conductor and the melt of this application, the parallel melt can use a smaller-sized melt. After the conductor is disconnected, the melt is quickly fused in the arc-extinguishing medium and is mechanically disconnected. Multiple fractures are formed on the body, and the multiple fractures cooperate with the nested protection device at the melt and the arc extinguishing medium to extinguish the arc. Overvoltage will not cause arc re-ignition at the conductor fracture. When using a smaller-sized melt, the cross-sectional area of the melt is smaller, and the step current is also lower. Arc capability, to achieve fast protection, excellent insulation performance after breaking.

Description of drawings

Fig. 1 is a schematic structural diagram of some embodiments of the present application in a normal working state.

Fig. 2 is a schematic diagram of the structure of the nested protection device on the conductor starting to establish insulation after the conductor is broken according to some embodiments of the present application.

Fig. 3 is a schematic diagram of the structure of the disconnected part of the conductor and the nesting protection device covering it entering the melt in some embodiments of the present application.

Fig. 4 is a schematic diagram of the structure in which both the conductor and the melt are disconnected in some embodiments of the present application.

Fig. 5 is a schematic structural diagram of other embodiments of the present application in a normal working state.

Fig. 6 is a schematic structural view of another embodiment of the present application showing that the nested protective device on the conductor starts to establish insulation after the conductor is broken.

Fig. 7 is a schematic structural view of the disconnected part of the conductor and the nesting protection device covering it entering the melt in another embodiment of the present application.

Fig. 8 is a schematic structural diagram of disconnected conductors and melts in other embodiments of the present application.

Fig. 9 is a schematic structural diagram of the location of the primary fracture where the melt is broken for the first time according to other embodiments of the present application.

Fig. 10 is a schematic structural diagram of the location of the secondary fracture where the melt is broken for the second time according to other embodiments of the present application.

Detailed ways

The present application provides a nested excitation protection device for interrupting conductors and melts. The excitation protection device for nested interruption conductors and melts mainly includes an excitation source, an impact device, a casing, a conductor, and a Melt, set the nesting protection device on the conductor or the melt at the same time, or only set the nesting protection device on the melt; when there is no parallel melt, when the conductor is not provided with an insulating sheath, the shell under the conductor can be A nesting protection device is set in the body, and the disconnected part of the conductor enters the nesting protection device driven by the impact device. The impact device and the nesting protection device are interference fit to complete the insulation and sealing of the conductor fracture, thereby completing the breaking of the fault current. When a melt is connected in parallel and a nesting protection device is provided on the melt, and no insulating sheath is provided on the conductor, the nesting protection device on the melt is located in front of the disconnected part of the conductor, and the disconnected part of the conductor and the impact device Together, they enter the nested protection device on the melt and form an insulating seal around the conductor fracture. At this time, the fault current can only flow through the parallel melt, and the parallel melt begins to complete the fusing and arc extinguishing work. After that, the impact device continues to drive the nested protection device on the melt to break the melt, further enhancing the insulation ability after breaking. When the conductor and the melt are respectively provided with a nesting protection device, the impact device drives the disconnected part of the conductor with the nesting protection device to displace together into the nesting protection device on the melt, forming a reliable double-layer sealing structure and Build insulation. At this time, the fault current can only flow through the parallel fuse, and the parallel fuse starts to complete the work of fusing and arc extinguishing. After that, the impact device continues to drive the nested protection device on the melt to break the melt, realizing the sequential disconnection of the conductor and the melt, and further enhancing the insulation ability after breaking.

The housing may be of an upper and lower housing structure, a left and right housing structure, and the like. The sealed contact between the conductor and the housing prevents the arc from flying out from the contact surface to cause damage to external devices when disconnected, and prevents external dust, water, etc. from entering the housing. The shell material is insulating material.

The excitation source is fixed in the casing, and the excitation source is a gas generating device, which can generate high-pressure gas after receiving a specified electrical signal, and drive the impact device to displace and cut off the conductor. In order to ensure the smooth displacement of the impact device, conductor disconnection part, etc. in the housing, a cavity for displacement of the impact device, conductor disconnection part, nesting protection device, etc. is provided in the housing.

There are pre-fractures on the conductor or the melt. The nesting protection device can be set at the pre-fracture of the conductor or melt. The pre-fracture is the part where the conductor or melt is broken by the impact device. There are break weak points on both sides of the pre-fracture. The form of the fractured weak point can be a "V" groove, a "U" groove, a reduced cross section or a pre-rolled hole and other structures that reduce strength.

The melt is bent into a spatial geometry for easy placement in the housing cavity. The melt and the impact device are respectively located on both sides of the conductor, and the conductor and the melt are located in front of the displacement of the impact device in turn. The two ends of the melt are electrically connected to the conductor to form a parallel relationship, and the electrical connection can be made by bolt crimping, conductive shrapnel connection, welding, etc. There is also a narrow neck on the melt, that is, the pre-fusing place of the melt. The melt can be broken mechanically under the impact of the impact device, and can also be fused under the state of thermal melting.

The cavity where the narrow neck of the melt is located is filled with an arc extinguishing medium for assisting arc extinguishing. An auxiliary arc extinguishing structure is provided at the bottom of the housing. The housing bottom is sealed by the housing bottom cover.

The impact device is located between the excitation source and the conductor. The impact device is in sealed contact with the inner chamber of the shell, which realizes the complete separation of the upper and lower chambers of the impact device, which can avoid the impact of high-pressure gas on the insulation capacity of the fracture and prevent the fault current from being introduced into the drive circuit. At the same time, the high-pressure gas is independently sealed between the impact device and the Between the excitation sources, it can prevent the impact device from rebounding after it moves into place. In order to maintain a smooth linear displacement of the impact device, a limit chute is set on the chamber where the impact device is located, and the opposite sides of the impact device are set in the limit chute to prevent the impact device from rotating in the shell and ensure that the impact end of the impact device is broken. Opening of pre-fractures in conductors or melts. The initial position of the impact device is limited by the limit structure. The impact device is made of insulating material.

Several preferred embodiments are given below and described in detail with reference to the diagrams.

First, some embodiments according to the present application will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1 , in some embodiments, the housing may include an upper housing 204 and a lower housing 212 that are hermetically mated, and the lower housing 212 is sealed by a bottom cover 214 . The shell material is insulating material. The upper casing and the lower casing are molded by injection molding, and may also be molded by other molding methods. A cavity is opened in the upper shell and the lower shell and passes through the upper and lower ends of the upper and lower shells. The conductor 207 is passed between the upper casing and the lower casing, and its two ends are located outside the casing and can be connected to an external circuit. The conductor 207 in the casing passes through the cavity opened in the upper casing and the lower casing .

In the cavity of the upper casing on the side of the conductor 207, an impact device 203 and an excitation source 201 are sequentially arranged. In this embodiment, the excitation source is an electronic ignition device. The impact device is located between the excitation source and the conductor. The upper end in the cavity of the upper housing is provided with a stepped hole structure, the excitation source is installed at the stepped hole, and the position is limited by the stepped hole. A protective cover 202 is pressed on the outer periphery of the upper casing, and the protective cover is pressed on the step on the excitation source, and the excitation source is positioned by the protective cover 202 and the limiting steps in the cavity of the upper casing. The excitation source can be connected with an external control system, trigger an action after receiving an external excitation electrical signal, and release high-pressure gas as the driving force for driving the impact device.

The impact device 203 is a piston structure in this embodiment, and its material is an insulating material, which is formed by injection molding, and can also be formed by other molding methods. The end surface of the impact device 203 close to the conductor 207 is set as an impact end, and the conductor is cut off by the impact end to form a fracture on the conductor. The upper end surface of the impact device is set as an arc-shaped concave structure 203a. The purpose of the arc-shaped concave structure is to make the high-pressure gas released by the excitation source concentrate and directly act on the upper end surface of the impact device to obtain the maximum driving force, and at the same time reduce the weight of the impact device. Save material. A plurality of limit projections 203a are arranged at intervals on the outer peripheral surface of the impact device, and corresponding limit grooves are provided on the cavity wall of the upper housing, and the limit projections 203a are provided in the limit grooves on the cavity wall. The initial position of the impact device is defined. The shape of the limiting protrusion 203a is a pointed structure inclined upwards, and its purpose is that when impacted, the limiting protrusion 203a can get out of the limiting groove faster and release its restraint on the impact device. When the excitation protection device is in the normal working state, that is, the initial position, it is necessary to ensure that the impact device will not cause impact on the conductor and affect the normal operation of the conductor. Therefore, the initial position of the impact device needs to be limited. However, the limit protrusion 203a needs to meet the requirements that when the impact device is impacted by the driving force released by the excitation source, the limit protrusion 203a will be disconnected to release the restraint on the impact device, so as to ensure the displacement of the impact device. The impact device 203 needs to be in sealing contact with the cavity where it is located. Therefore, an annular structure is provided on the outer peripheral surface of the impact device, and a sealing ring 203b is arranged in the annular structure. It can be ensured that when the impact device is displaced, under the action of the sealing ring, the impact device is always in sealing contact with the cavity where it is located. In order to ensure that the impact device is always in sealing contact with the cavity where it is located during the displacement process, the sealing ring 203b is preferably arranged on the upper outer peripheral surface of the impact device. In this embodiment, the impact device 203 is in the form of a T-shaped structure, and its upper end part is in complete sealing contact with the cavity where it is located. The columnar part of the T-shaped structure can partially maintain non-contact with the cavity where it is located. The purpose is to reduce the movement of the impact device. frictional resistance in the process. In order to ensure the linear displacement of the impact device in the cavity, limit slide grooves (not shown) are provided on the cavity walls on opposite sides, and sliders are arranged at the corresponding positions of the impact device, and the sliders on the impact device are locked Set in the limit chute to ensure the linear displacement of the impact device and prevent it from rotating in the cavity. At the same time, in order to prevent wrong installation, the depth or width of the limit chute and slider on one side can be made different from that on the other side. In order to ensure the linear displacement of the impact device, vertical ribs can also be provided on the wall of the cavity, and a limiting chute can be provided at one position of the impact device to achieve linear displacement limitation. The impact end face of the impact device is a planar structure.

The conductor 207 is a strip-shaped structure made of copper, silver or other conductive metal materials with good electrical conductivity. It can be a one-shaped flat structure, or a few-shaped flat structure. On the conductor 207 located in the cavity of the upper and lower housings, there are two disconnected weak points 207a, the conductor part between the two disconnected weak points forms a pre-fracture 208, and the impact end of the impact device 203 is facing the pre-fracture of the conductor. . When the pre-fracture 208 of the conductor is impacted by the impact device, the conductor part at the conductor pre-fracture is completely detached from the conductor 207 under the impact of the impact device to form a disconnected part of the conductor, and a fracture is formed between the two disconnected weak points of the conductor. In this embodiment, each disconnection weak point 207 is formed by corresponding V-shaped grooves formed on the upper and lower sides of the conductor 207 . A nesting protection device is set on the conductor pre-fracture 208 . The nesting protection device at the conductor includes an upper conductor nesting protection block 205 and a conductor lower nesting protection block 206 which are oppositely arranged on the upper and lower sides of the conductor pre-fracture 208 . The upper conductor nesting protection block 205 and the conductor lower nesting protection block 206 are nested relative to each other, and the conductor pre-fracture is covered therein. The two ends of the conductor upper nesting protection block 205 and the conductor lower nesting protection block 206 are respectively located at the Disconnect the weakest point at the thinnest point. The nesting protection block 205 above the conductor and the nesting protection block 206 below the conductor are made of insulating material, and are arranged in close contact with the conductor. Such a structural design can ensure that there is no excess air between the nesting protection device and the conductor pre-fracture; after the pre-fracture is broken, the nesting protection device can cover the disconnected part of the conductor to the greatest extent possible.

The lower housing 212 is integrally formed by injection molding or other molding methods. A cavity 212a is opened on the lower casing below the pre-fracture of the conductor 207, and the cavity 212a passes through the upper and lower end surfaces of the lower casing. Cavities 215 are respectively opened on opposite sides of the cavity 212a. The upper end of the cavity 215 in contact with the upper casing and the conductor is a sealed structure, and the lower end is open. The cavity 212a is a stepped cavity structure, and the width of the cavity above the step is greater than the width of the cavity below the step. The width of the cavity close to the conductor is consistent with the width of the nesting protection device on the conductor, ensuring that the disconnected part of the conductor with the nesting protection device can enter the cavity below it, and the two ends of the disconnected part of the conductor are in line with the cavity. The cavity wall is close together, which can elongate the extrusion arc. Accommodating grooves (not shown) with open lower ends are arranged symmetrically on opposite sides of the cavity below the step for accommodating the nesting protection device at the pre-fracture of the melt. A through-hole groove for the melt 211 to pass through is opened at the sealed upper end of the cavity 215 .

The melt 211 is made of conductive material and has a fusible sheet structure. The melt is provided with two sets of breaking weak points at intervals, and each set of breaking weak points includes two breaking weak points arranged at intervals, and each set of breaking weak points constitutes a pre-fracture of the melt. Nesting protection devices are respectively sleeved at the pre-fracture of each melt. The nesting protection device at the melt includes a left nesting protection block 209 and a right nesting protection block 210, which are respectively interference-fitted and assembled in the two accommodating grooves below the step of the cavity 212a in the lower shell. After assembly, The left nesting protection block 209 and the right nesting protection block 210 are symmetrically arranged on opposite sides of the cavity 212a, and are respectively located below the disconnected weak point of the conductor. The lower ends of the left nesting protection block 209 and the right nesting protection block 210 extend toward the center of the cavity 212a in a stepped shape, making them L-shaped. The upper parts of the two symmetrically arranged left nesting protection blocks 209 and right nesting protection blocks 210 are flush with the inner wall of the cavity 212a where they are located. structure.

The melt is located at the lower end face of the lower shell, the melt passes through the cavity 212a, passes through the left nesting protection block 209 and the right nesting protection block 210, and the cavity 215 is positioned at the open end of the lower shell lower end face, and then melts The two ends of the body are respectively bent into the cavity 215, and then penetrated through the through-hole slot in the cavity 215 and connected in parallel with the conductors located between the upper shell and the lower shell. The connection methods include conductive connections such as bolt connection and welding connection. Way. After the melt and the conductor are connected in parallel, the shape of the melt takes on a spatial geometry.

A bottom cover 214 is provided at the lower end surface of the lower case, and the contact between the bottom cover 214 and the outer surface of the lower case is assembled by a stepped ferrule for sealing the lower case. And through the bottom cover 214, the volumes of the cavity 212a and the cavity 215 located below the pre-fracture of the conductor 207 are increased; the cavity 212a and the cavity 215 are not connected. After the bottom cover closes the lower casing, the melt is passed through the cavity 212 a and the cavity 215 . Protruding ribs are provided on the inner end surface of the bottom cover at the bottom of the cavity 212a, and limiting grooves that go deep into the inner end surface of the bottom cover are provided on both sides of the ribs. An auxiliary arc extinguishing structure 213 is pressed on the protruding edge, and the bottom of the auxiliary arc extinguishing structure 213 is fitted in the limiting groove on the inner end surface of the bottom cover to form an auxiliary arc extinguishing groove. The bottom of the auxiliary arc extinguishing structure has buffering effect. The auxiliary arc extinguishing structure 213 is in the shape of a zigzag, and the auxiliary arc extinguishing grooves on both sides are located at the bottom of the cavity 212a on both sides of the protruding edge of the bottom cover. The lower ends of the left nested protection block 209 and the right nested protection block 210 are respectively located in the auxiliary arc extinguishing grooves on both sides of the auxiliary arc extinguishing structure. Part of the sides of the arc structure are in contact, and the remaining sides are in contact with the inner wall of the cavity 212a. The cavity 215 is filled with an arc extinguishing medium, and the fusing weak point of the melt is located in the cavity 215 , generally the fusing weak point is a narrow neck, or other structures that increase the resistance.

The working process of this embodiment: Referring to Fig. 2 to Fig. 4, the excitation source 201 acts after receiving the excitation electric signal from the outside, releases the high-pressure gas, drives the impact device 203 to make a linear displacement, and the impact end of the impact device 203 impacts the package on the conductor 207 Cover the pre-fracture at the nesting protection device, so that the conductor is disconnected from the pre-fracture to form a conductor disconnection part, as shown in Figure 2, after the conductor disconnection moves downward for a distance of 2 to 3mm, the nesting protection device on the conductor The first layer of sealing structure begins to form, and the insulation is established between the conductor breaks. The impact device continues to drive the disconnected part of the conductor coated with the nesting protection device to enter between the left nesting protection block 209 and the right nesting protection block 210 in the cavity 212a of the lower housing, so that the conductor disconnection part is completely covered The conductor nesting protection device and the melting point nesting protection device are completely insulated from the surrounding under the joint action; then, the impact device continues to drive the disconnected part of the conductor and the nesting protection device covering it, and the melting point nesting protection device Common downward displacement, so that the left nesting protection block 209 and the right nesting protection block 210 respectively enter the cavities on both sides of the auxiliary arc extinguishing structure, break the melt pre-fracture, and form two fractures on the melt; the impact device Drive the left nested protection block 209 and the right nested protection block 210 to continue to displace in the cavities on both sides of the auxiliary arc extinguishing structure with the melt disconnected part to further extinguish the arc until the nested protection device covering the disconnected part of the conductor reaches The displacement stops at the upper end surface of the auxiliary arc extinguishing structure above the raised rib.

Arc extinguishing principle: When the conductor pre-fracture is interrupted, the disconnected part of the conductor with the nesting protection device falls into the middle of the nesting protection device at the melt under the drive of the impact device, due to the nesting of the disconnected part of the covered conductor With the joint action of the protective device and the nested protective device at the melt, the disconnected part of the conductor is quickly disconnected from the main circuit and insulation is established, and it is difficult for the arc to form a re-ignition here. At this time, the fault current can only flow through the parallel fuse, and the fuse with a smaller size can be used for faster fusing, and the overvoltage generated during fusing will not cause breakdown and arcing between the conductor fractures of the main circuit Re-ignition situation. Then the impact device continues to push the displacement of the nesting protection device at the melt and disconnect the melt, and the residual arc at the two fractures formed on the melt is completed under the co-extrusion of the nesting protection device at the melt and the auxiliary arc extinguishing structure Arc extinguishing.

Next, other embodiments according to the present application will be described in detail with reference to the accompanying drawings. The main differences between the embodiments described here and those previously described are the changes in the structure of the nesting protection device at the melt, and the change in the slope of the contact surface between the lower shell and the upper shell. In the previously described embodiments, the nesting protection devices at the melt are arranged symmetrically from left to right, but in the present embodiments described here, the nesting protection devices at the melt are arranged up and down, see FIG. 5 for details. The nesting protection device at the melt, including the upper nesting protection block 309 and the lower nesting protection block 310 located on the upper and lower sides of the melt, which are nested oppositely; The melt portion is located in the cavity 312a. The upper nesting protection block 309 is located at the step in the cavity 312a, and has a groove 309a on it, and the shape of the inner wall of the groove is consistent with the shape of the inner wall of the cavity 312a. A vertical groove 309b is formed at the center of the bottom of the upper nesting protection block 309, and two small grooves are respectively formed on opposite sides of the vertical groove. The lower nesting protection block 310 is a cover-like structure, on which two grooves corresponding to the small grooves on both sides of the vertical groove are arranged, and a penetrating lower nesting protection block is opened at the position corresponding to the vertical groove 309b. The through-hole grooves on the upper and lower ends of the block 310. The upper nesting protection block 309 and the lower nesting protection block 310 are nested relative to each other, the vertical grooves 309b and the through-hole grooves of the upper nesting protection block and the lower nesting protection block are deeper in depth, and the lower end penetrates the lower nesting protection block The vertical groove 309b on the lower end surface; after the grooves on both sides of the vertical groove 309b are docked, two sealed accommodating cavities 316 are respectively formed on the nesting protection device at the melt, and the melt passes through the accommodating cavities 316 .

The place where the melt 311 passes through the lower end surface of the cavity wall of the cavity 312a is set as an inclined surface, and correspondingly, the place where the bottom cover 314 contacts the inclined surface of the lower end surface of the cavity wall of the cavity 312a is also correspondingly set as an inclined surface.

The melt 311 is located at the lower end surface of the lower shell, and the melt 311 passes through the cavity 312a, the cavity 315, the cavity 312a and the inclined surface of the cavity wall adjacent to the cavity 315, and passes through the nested protective block 309 on the melt Contact end face with the nesting protection block 310 under the melt, the vertical groove 309b formed by the nesting protection block 309 on the melt and the nesting protection block 310 under the melt, and the accommodating cavity 316 on both sides of the vertical groove , and then the two ends of the melt are respectively bent into the cavity 315, and then penetrated through the through-hole groove in the cavity 315 and connected in parallel with the conductor located between the upper shell and the lower shell. The connection methods include bolt connection and welding connection and other conductive connections. After the melt and the conductor are connected in parallel, the shape of the melt takes on a spatial geometry.

The bottom cover 314 is provided with grooves on the bottom cover 314 corresponding to the

cavities

312a and 315 on the lower housing; and a buckle step is provided on the side end surface of the bottom cover 314 . When the bottom cover 314 is provided with the lower end surface of the lower case, the buckle step at the end face on the upper side of the bottom cover 314 conflicts with the buckle step provided on the lower case, sealing the lower case; The groove seals and lengthens cavity 312a and cavity 315 on the lower housing. The bottom cover 314 presses and fixes the melt 311 between the cavity 312a of the lower casing and the adjacent cavity wall slope of the cavity 315, so as to facilitate the melt to be broken. The melt is in a bent state on one side of the inclined surface of the inner cavity wall of the cavity 315, so that the nesting protection device at the melt can pull off the melt in the cavity 312a. A buffer device 313 is provided at the bottom of the cavity 312a on the bottom cover 314, and in this embodiment, the buffer device is a buffer pad. The accommodating cavity 316 between the upper nesting protection block 309 and the lower nesting protection block 310 and the cavity 315 are respectively filled with arc extinguishing medium. The melting weak point is located in the accommodating cavity 316 and/or the cavity 315 .

A nested melt cut-off block 317 is interference-fitted in the vertical groove, and there is a movement gap between the upper end surface of the nested melt cut-off block 317 and the top of the vertical groove; the melt is located at the nested melt cut-off block 317 at the upper end. In the vertical groove, the melts on both sides of the nested melt cutting block 317 are respectively provided with breaking weak points.

The working process of this embodiment 2: Referring to Fig. 6 to Fig. 8, when the conductor pre-fracture is broken under the action of the impact device, the broken part of the conductor covered with the nesting protection device falls into the upper nest under the push of the impact device. In the groove of the cover protection block 309, under the joint action of the nesting protection device covering the disconnected part of the conductor and the upper nesting protection block, the disconnected part of the conductor is disconnected from the main circuit and moves down 2 to 3mm quickly. Create insulation where it is difficult for the arc to re-ignite. The impact device continues to push the upper nested protection block to move downward and pull the melt, and the melt is broken at 401 shown in Figure 9, forming a primary cut of the melt, which is located in the cavity 315 and is quenched by the arc extinguishing medium Enclosed, the arc extinguishing medium helps extinguish the arc. Afterwards, the impact device drives the disconnected part of the conductor and the nesting protection device covering it, the upper nesting protection block, the lower nesting protection block and the nesting melt cutting block 317 to continue to move downward, and the nesting melt cutting block 317 After colliding with the buffer pad 313, it stops moving, breaks the melt located in the vertical groove, and forms a secondary cut of the melt at 402 shown in FIG. 10 , which helps to improve the insulation performance after breaking.

When the fault current is large, after the conductor is disconnected, an interrupted fracture and a fusing fracture can be formed on the melt. Melt-fusing fractures are formed in chambers filled with arc-extinguishing media, further improving arc-extinguishing capabilities.

The arc extinguishing principles of the embodiments described here are the same as those of the previously described embodiments, and thus will not be repeated here.

Next, further embodiments according to the present application will be described in detail with reference to the accompanying drawings. On the basis of the previously described embodiments, the nested protection device on the conductor can be removed. Since the impact device uses an insulating material, the impact end surface of the impact device will cover the pre-fracture of the conductor when it impacts the conductor, and drive it into the melt In the nested protection device at the pre-fracture, insulation can also be realized to prevent arc re-ignition.

In the above-mentioned embodiments, the sealing design is adopted between the upper shell, the lower shell and the bottom cover, which can not only prevent the fracture from being polluted by foreign objects, but also prevent the high-temperature arc from blowing out of the shell and damaging the surrounding devices.

The nested protective device and auxiliary arc extinguishing structure can be made of materials that generate arc extinguishing gas when heated, such as rubber, nylon materials or other materials that generate gas when heated. During the breaking process, the nested protection device and the auxiliary arc extinguishing structure will generate gas when heated, which will increase the fracture pressure and compress the arc, making it easier to extinguish the arc.

Industrial Applicability

The present application provides a nested excitation protection device for interrupting a conductor and a melt, including a shell, an excitation source, an impact device, a conductor, a melt connected in parallel with the conductor, and a melt below the conductor pre-fracture A nesting protection device is provided at the pre-fracture, and the nesting protection device at the pre-fracture of the melt is provided with an accommodating cavity for the disconnected part of the conductor to fall into; the shape of the accommodating cavity and the disconnected part of the conductor is matched; driven by the impact device, the conductor breaking part can push the nesting protection device to break the melt. The excitation protection device of the present application can prevent the re-ignition of the arc at the conductor fracture and improve the arc extinguishing ability by setting the nested protection device.

In addition, it can be understood that the nested interrupted conductor and melt excitation protection device of the present application is reproducible and can be used in various industrial applications. For example, the excitation protection device for nested interrupting conductors and melts of the present application can be used in the field of excitation protection.

Claims

An excitation protection device for nested interrupting conductors and melts, comprising a housing, an excitation source, an impact device, a conductor, and a melt connected in parallel with the conductor, characterized in that the melt below the conductor pre-fracture A nesting protection device is provided at the pre-fracture, and the nesting protection device at the pre-fracture of the melt is provided with an accommodating cavity for the disconnected part of the conductor to fall into; the shape of the accommodating cavity and the disconnected part of the conductor is matched; driven by the impact device, the conductor breaking part can push the nesting protection device to break the melt.
According to claim 1, the excitation and protection device for interrupting the conductor and the melt is characterized in that, the nesting protection device at the pre-fracture of the melt comprises two nesting protection blocks arranged oppositely, the The nested protection blocks are respectively arranged at intervals at the pre-fracture of the melt; the accommodating cavity is formed between the two nested protection blocks.
According to claim 2, the excitation and protection device for interrupting conductors and melts in a nested type is characterized in that an auxiliary arc extinguishing groove is provided at the bottom of the housing below each of the nested protection blocks; The lower end of the sleeve protection block is located at the opening of the auxiliary arc extinguishing groove.
According to claim 2, the excitation protection device for nested interrupting conductors and melts is characterized in that a rib is provided on the bottom of the housing, and an auxiliary arc extinguishing structure is built on the rib; The auxiliary arc extinguishing structure on both sides of the rib and the side wall of the chamber where the auxiliary arc extinguishing structure is located form the auxiliary arc extinguishing groove.
According to any one of claims 1 to 4, the nested protection device for interrupting the conductor and the melt is characterized in that, the nesting protection device at the pre-fracture of the melt includes a relatively nested arrangement at Two nested protective blocks on the upper and lower sides of the melt pre-fracture; the nested protective block on the side close to the conductor is provided with the accommodating cavity.
According to claim 5, the excitation protection device for nested interrupting conductors and melts is characterized in that at least one arc extinguishing chamber is arranged on the nesting protection device at the pre-fracture of the melt, and in the The arc extinguishing chamber is filled with an arc extinguishing medium, and the melt passes through the arc extinguishing chamber.
According to claim 6, the excitation protection device for interrupting the conductor and the melt is characterized in that at least one arc extinguishing chamber is arranged at intervals on the nest protection device on the melt ; Between the arc extinguishing chambers, or on one side, or on both sides, a vertical groove with an opening away from the conductor is provided, and a melt-embedded cut-off block is arranged in the vertical groove, and the There is a movement gap between the top of the melt nesting cut-off block and the top of the vertical groove, and its lower end protrudes out of the nesting protection device at the pre-fracture of the melt; the melt is located in the melt nest At the top end face of the cut-off block, breaking weak points are respectively set on the melts on both sides of the top end face of the melt-embedded cut-off block.
According to any one of claims 1 to 7, the excitation protection device for nested interrupted conductors and melts is characterized in that, a nesting device covering the pre-fracture of the conductor is provided at the pre-fracture of the conductor. protective device.
According to claim 8, the excitation protection device for nested interrupting conductors and melts is characterized in that the nesting protection device at the conductor pre-fracture includes relatively nested devices arranged on the upper and lower sides of the conductor pre-fracture. Nested protection blocks.
According to any one of claims 1 to 7, 9, the excitation protection device for nested interrupted conductors and melts is characterized in that the housing includes an upper housing, a lower housing and a bottom cover, so The conductor is located between the upper shell and the lower shell, and the bottom cover closes the lower shell; There is a melt quenching chamber through which the melt passes, said melt quenching chamber being filled with an quenching medium.
According to claim 10, the excitation protection device for nested interrupting conductors and melts is characterized in that, an upper shell that penetrates the upper end and the lower end of the upper shell is opened in the upper shell body cavity, the impact device and the excitation source are sequentially arranged in the upper housing cavity on the side of the conductor, the excitation source is an electronic ignition device, and the impact device is located in the excitation between the source and the conductor.
According to claim 11, the excitation protection device for the nested interrupted conductor and melt is characterized in that, a plurality of limit protrusions are arranged at intervals on the outer peripheral surface of the impact device, and, on the upper shell A limiting groove configured to limit the initial position of the impact device is opened on the wall of the cavity of the body.
The excitation protection device for nested interrupting conductors and melts according to claim 12, characterized in that, the shape of the limiting protrusion is a pointed structure inclined upwards.
According to any one of claims 10 to 13, the excitation protection device for nested interrupted conductor and melt is characterized in that, a The cavity of the lower casing, the cavity of the lower casing penetrates the upper end surface and the lower end surface of the lower casing, the cavity of the lower casing is a stepped cavity structure, and the width above the step is larger than the The width below the steps.
According to any one of claims 10 to 14, the excitation protection device for the nested interrupted conductor and the melt is characterized in that the side wall of the melt arc extinguishing chamber where the melt passes is set as Inclined surface structure; the melt in the arc extinguishing material on the side close to the inclined surface structure is provided with a disconnection weak point, when the nested protection device on the melt is pushed to move downward, the The melt is broken at the weak point.
According to any one of claims 10 to 15, the excitation protection device for nested interrupting conductors and melts is characterized in that the casing between the melt arc extinguishing chamber and the conductor A through-hole slot is opened on the wall for the melt to pass through, and two ends of the melt respectively pass through the through-hole slot and are connected in parallel with the conductor.
According to any one of claims 10 to 16, the excitation protection device for nested interrupted conductors and melts is characterized in that a buffer for buffering after the melt is broken is provided on the bottom cover. device.
According to any one of claims 1 to 7, 9, 11 to 17, the nested protection device for interrupting the conductor and the melt is characterized in that, the material of the nested protection device is capable of producing arc extinguishing when heated gas material.
According to claim 4, the excitation and protection device for interrupting conductors and melts in a nested mode is characterized in that, the material of the auxiliary arc extinguishing structure is a material that can generate arc extinguishing gas when heated.