CN221040885U

CN221040885U - Isolating switch with arc extinguishing device

Info

Publication number: CN221040885U
Application number: CN202322311451.4U
Authority: CN
Inventors: 杨徽; 欧波; 杨靖雯; 黄其平; 罗永顺; 曾浪; 吴建新; 王超
Original assignee: Chongqing Deepu Electric Co ltd
Current assignee: Chongqing Deepu Electric Co ltd
Priority date: 2023-08-28
Filing date: 2023-08-28
Publication date: 2024-05-28
Anticipated expiration: 2033-08-28

Abstract

The utility model discloses an isolating switch with an arc extinguishing device, which specifically comprises: the device comprises a base, a cover body, a static knife assembly, a movable knife assembly and an arc extinguishing device; the base is a box body with one surface open, the cover body is rotatably connected with the base through a rotating shaft, and the opening of the box body is covered or exposed through rotating the cover body; the static knife assembly is arranged in the box body of the base and comprises a first static main contact, a static arc contact and a second static main contact which are gradually far away from the rotating shaft; the movable knife assembly is arranged on one surface of the cover body facing the opening of the box body and comprises a first movable main contact, a movable arc contact and a second movable main contact which are gradually far away from the rotating shaft; the arc extinguishing device is arranged in the box body of the base, and the static arc contact is arranged in the arc extinguishing device. In the scheme provided by the embodiment of the utility model, the movable and static arc contacts are contacted before the second movable and static main contacts are contacted and separated before the first movable and static main contacts are separated, and the contact and separation of the movable and static arc contacts are completed in the arc extinguishing device, so that the main contacts are protected from being ablated by an electric arc.

Description

Isolating switch with arc extinguishing device

Technical Field

The utility model relates to the technical field of isolating switches, in particular to an isolating switch with an arc extinguishing device.

Background

The traditional isolating switch has no arc extinguishing capability and can only switch on or off the circuit under the condition of no load current; in the existing outdoor isolating switch, if the circuit is separated and combined under the condition of rated load, contacts of a main loop are often ablated, and the circuit is not suitable for the scene of needing emergency maintenance of a lower-level circuit and electrical equipment.

Disclosure of utility model

In view of the above problems, the present utility model provides a disconnecting switch with an arc extinguishing device, which overcomes the above problems or at least partially solves the above problems, and the technical solution is as follows:

An isolating switch with an arc extinguishing device comprises a base, a cover body, a static knife assembly, a movable knife assembly and an arc extinguishing device;

the base is a box body with one surface open, the cover body is rotatably connected with the base through a rotating shaft, and the cover body is rotated to cover or expose the opening of the box body;

The static knife assembly is arranged in the box body of the base and comprises a first static main contact, a static arc contact and a second static main contact which are gradually far away from the rotating shaft, and the static arc contact is connected with the second static main contact; the movable knife assembly is arranged on one surface of the cover body, which faces the opening of the box body, and comprises a first movable main contact, a movable arc contact and a second movable main contact which are gradually far away from the rotating shaft, wherein the first movable main contact is connected with the second movable main contact through a conductive piece, and the movable arc contact is connected with one of the first movable main contact and the second movable main contact;

The arc extinguishing device is arranged in the box body of the base, and the static arc contact is arranged in the arc extinguishing device;

When the cover body rotates around the rotating shaft towards the direction close to the base, the first moving main contact, the moving arc contact and the second moving main contact are sequentially contacted with the first static main contact, the static arc contact and the second static main contact;

When the cover body rotates around the rotating shaft in a direction away from the base, the second moving main contact, the moving arc contact and the first moving main contact are separated from the second static main contact, the static arc contact and the first static main contact in sequence.

The device, optionally, the arc extinguishing device comprises a shell, a through hole is formed in the surface of the shell, a second cavity is formed in the shell, and the static arc contact is arranged in the second cavity;

The movable arc contact forms a circular arc structure, a first end of the circular arc structure is fixed on the cover body and is connected with one of the first movable main contact and the second movable main contact, and the center of the circular arc structure coincides with the axis of the rotating shaft; the second end of the circular arc structure opposite to the first end can pass through the through hole, and the movable arc contact enters the second cavity through the through hole and then contacts with the static arc contact;

And a sealing piece made of elastic materials is arranged in the through hole, and the surface opening of the sealing piece is used for the moving arc contact to pass through.

In the above device, optionally, the moving arc contact includes a first contact surface of an arc surface structure, and the static arc contact includes a second contact surface; when the cover body rotates around the rotating shaft to enable the movable arc contact to be in contact with the static arc contact, the second contact surface can slide on the cambered surface of the first contact surface.

The device, optionally, the surface of the shell of the arc extinguishing device is also provided with an exhaust opening;

The arc extinguishing device further includes:

The gas generating piece is arranged at one side of the moving path of the movable arc contact in the second cavity;

The air passage is formed in the second cavity, the air inlet of the air passage faces the air generating piece, and the air outlet of the air passage faces the air exhaust opening;

The grid plate assembly is arranged in the air passage;

the arc baffle is arranged between the exhaust opening and the air outlet of the air flue, and a heat radiation hole is formed in the arc baffle.

The device is characterized in that the gas generating member comprises a first surface which faces the moving arc contact after the moving arc contact enters the second cavity, the minimum distance between the moving arc contact and the first surface is a first distance in the moving process of the moving arc contact, and an electric arc generated by the moving arc contact and the static arc contact in the first distance can excite the gas generating member to discharge gas, and the first distance is not smaller than the failure distance of the gas generating member.

According to the device, optionally, the grid plate assembly comprises a plurality of arc-extinguishing grid plates which are arranged in parallel, a notch is arranged on one side of each arc-extinguishing grid plate, the notches of the plurality of arc-extinguishing grid plates form an arc-extinguishing channel, and the arc-extinguishing channel is arranged on the moving path of the movable arc contact in the second cavity; and among the arc extinguishing grid sheets which are arranged in parallel, the arc extinguishing grid sheet closest to the static arc contact is connected with the static arc contact, and the thickness of the arc extinguishing grid sheet is thicker than that of all the rest arc extinguishing grid sheets.

In the above device, optionally, the grid assembly includes a plurality of arc extinguishing grid plates disposed in parallel, and the plurality of arc extinguishing grid plates are disposed beside a motion path of the moving arc contact in the second cavity and cover an entire motion path of the moving arc contact in the second cavity; when the movable arc contact moves in the second cavity, the distance between each arc extinguishing grid piece and the movable arc contact is not lower than a set distance.

The device, optionally, the arc extinguishing device comprises at least two arc baffles arranged in parallel, wherein heat dissipation holes on the at least two arc baffles are arranged in a staggered manner, and the shortest distance between the arc baffle closest to the grid plate assembly and the grid plate assembly is not less than 5mm.

The device, optionally, the isolating switch further comprises a fuse, the fuse is installed through the cover body and connected with the first moving main contact and the second moving main contact, and the moving arc contact is connected with the second moving main contact.

According to the device, optionally, the isolating switch further comprises a first wiring terminal and a second wiring terminal, wherein the first wiring terminal is connected with the first static main contact after being connected with the base, and the second wiring terminal is connected with the second static main contact after being connected with the base;

Waterproof connectors are arranged between the first wiring terminal, the second wiring terminal and the base.

Compared with the prior art, the utility model has the following advantages: in the scheme provided by the embodiment of the utility model, the movable arc contact and the static arc contact are contacted before the second movable main contact and the second static main contact are contacted, and are separated before the first movable main contact and the first static main contact are separated, and the contact and the separation of the movable arc contact and the static arc contact are completed in the arc extinguishing device, so that when the isolating switch provided by the embodiment of the utility model is used for switching on and off a rated load circuit, an electric arc is generated and extinguished in the arc extinguishing device, the main contact is protected from being ablated by the electric arc, and the electric life times of the isolating switch are improved; the embodiment further defines the full insulation structure of the isolating switch, and ensures the operation safety of the isolating switch.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

Fig. 1 is a schematic structural diagram of an isolating switch with an arc extinguishing device according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a disconnecting switch with an arc extinguishing device according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a disconnecting switch with an arc extinguishing device according to an embodiment of the present utility model;

Fig. 4 is a schematic structural diagram of a disconnecting switch with an arc extinguishing device according to an embodiment of the present utility model;

Wherein, 1-base; 2-an arc extinguishing device; 3-moving arc contacts; ; 31-a first contact surface; 4-a cover; 5-a first stationary main contact; 6-a second stationary main contact; 7-a first moving main contact; 8-a second movable main contact; 9-static arc contacts; 91-a second contact surface; 10-a waterproof baffle; 11-through holes; 12-grid assembly; 13-arc baffle; 14-a first connection terminal; 15-a second connection terminal; 16-waterproof joint; 17-a fuse; 18-gas generating piece; 19-exhaust opening.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Referring to fig. 1 for illustrating a schematic perspective structure of an isolating switch with an arc extinguishing device according to an embodiment of the present utility model, the structure illustrated in fig. 1 is a feasible implementation scheme of the isolating switch with an arc extinguishing device according to an embodiment of the present utility model, and the isolating switch with an arc extinguishing device specifically includes: the device comprises a base 1, a cover body 4, a static knife assembly, a movable knife assembly and an arc extinguishing device 2; the base 1 is a box body with one surface open, the cover body 4 is rotatably connected with the base 1 through a rotating shaft, and the cover body 4 is rotated to cover or expose the opening of the box body of the base 1. In the structure provided by the embodiment of the utility model, the cover body 4 is connected with the base 1 through the rotating shaft, the base 1 is usually fixed, and the cover body 4 is rotated, so that the cover body 4 is connected with or separated from the base 1; the cover body 4 and the base 1 form a first cavity when connected; the cover body 4 is connected with the base 1 to realize closing of the isolating switch, and the cover body 4 is separated from the base 1 to realize opening of the isolating switch. When the cover body 4 is rotated in the first direction, the cover body 4 gradually approaches the base 1 until being connected with the base 1, the cover body 4 covers the opening of the box body of the base 1, and a closed cavity is formed inside when the cover body 4 is connected with the base 1, namely, a first cavity is formed inside the cover body, and the first cavity is a mounting cavity for accommodating all devices inside the isolating switch. When the cover 4 is rotated in the opposite direction to the first direction, the cover 4 gradually moves away from the base 1, and the cover 4 exposes the opening of the case of the base 1, thereby exposing the devices inside the first chamber.

The static knife assembly is installed through the base 1, specifically, the static knife assembly is installed in the box body of the base 1, and the static knife assembly comprises a first static main contact 5, a static arc contact 9 and a second static main contact 6 which are gradually far away from the rotating shaft. The movable knife assembly is mounted through the cover body 4, specifically, the movable knife assembly is mounted on one surface of the cover body 4 facing the opening of the base 1 box body, and comprises a first movable main contact 7, a movable arc contact 3 and a second movable main contact 8 which are gradually far away from the rotating shaft; in the isolating switch, a first fixed main contact 5 and a second fixed main contact 6 are disconnected, a first moving main contact 7 and a second moving main contact 8 are communicated through a conductive piece, in the structure provided by the embodiment of the utility model, a static arc contact 9 is connected with the second fixed main contact 6, and a moving arc contact 3 can be connected with one of the first moving main contact 7 and the second moving main contact 8. When the cover body 4 is connected with the base 1, the static knife assembly and the movable knife assembly are limited in a first cavity formed by the base 1 and the cover body 4, so that the static knife assembly and the movable knife assembly are sealed after the isolating switch is closed, and are isolated from the outside. The arc extinguishing device 2 is arranged in the box body of the base through the base 1, namely, the arc extinguishing device is positioned in the first cavity, and the static arc contact 9 is arranged in the arc extinguishing device 2.

In the structure provided by the embodiment of the utility model, a first fixed main contact 5, a fixed arc contact 9 and a second fixed main contact 6 are sequentially arranged on a base 1 along the direction gradually far away from the rotating shaft, and a first movable main contact 7, a movable arc contact 3 and a second movable main contact 8 are sequentially arranged on a cover body 4 along the direction gradually far away from the rotating shaft, so that when the cover body 4 rotates around the rotating shaft towards the direction close to the base 1, the first movable main contact 7, the movable arc contact 3 and the second movable main contact 8 are sequentially contacted with the first fixed main contact 5, the fixed arc contact 9 and the second fixed main contact 6 in an arc extinguishing device 2; when the cover body 4 rotates around the rotating shaft in a direction away from the base 1, the second moving main contact 8, the moving arc contact 3 and the first moving main contact 7 are sequentially separated from the second fixed main contact 6, the static arc contact 9 in the arc extinguishing device 2 and the first fixed main contact 5.

The action logic and the working process of the isolating switch provided by the embodiment of the utility model are as follows: when the isolating switch is switched on, along with the rotation of the cover body 4 in the direction approaching to the base 1, the first moving main contact 7 is contacted with the first static main contact 5 firstly, then the moving arc contact 3 enters the arc extinguishing device 2 to be contacted with the static arc contact 9, a current path is formed, and finally the second moving main contact 8 is contacted with the second static main contact 6 until the cover body 4 is completely closed with the base 1. When the isolating switch is opened, the second movable main contact 8 is separated from the second static main contact 6 firstly along with the rotation of the cover body 4 in the direction away from the base 1, then the movable arc contact 3 is separated from the static arc contact 9 and the circuit is cut off to generate an electric arc, the electric arc moves in the arc extinguishing device 2, and the electric arc is extinguished in the arc extinguishing device 2 by carrying out arc extinguishing and discharging heat generated by the electric arc through the arc extinguishing device 2; finally, the first moving main contact 7 is separated from the first fixed main contact 5. When the switching-on/off operation is performed, the arc is generated and extinguished in the arc extinguishing device 2, and the main contact is protected from being ablated by the arc. Further, the moving arc contact 3 comprises a first contact surface 31, the static arc contact 9 comprises a second contact surface 91, and the first contact surface 31 can be selected as an arc surface structure; when the cover body 4 rotates relative to the base 1 through the rotating shaft, the second contact surface 91 can slide on the cambered surface of the first contact surface 31, and the first contact surface 31 and the second contact surface 91 are optionally partially or completely covered with an ablation-resistant and wear-resistant metal material, so that the ablation resistance of the arc contact is further improved.

In the structure provided by the embodiment of the utility model, optionally, one ends of the first fixed main contact 5 and the second fixed main contact 6 are fixed on the base 1, and the other ends of the first fixed main contact 5 and the second fixed main contact 6 are arranged in the first cavity to respectively provide connection ends contacted with the first moving main contact 7 and the second moving main contact 8. One end of the static arc contact 9 is fixed on the base 1 or in the arc extinguishing device 2 installed through the base 1 and is connected with the second static main contact 6; the other end of the static arc contact 9 is arranged in a second cavity defined by the arc extinguishing device 2, and provides a connecting end contacted with the moving arc contact 3. One end of the first moving main contact 7 and one end of the second moving main contact 8 are fixed on the cover body 4 and are connected with each other through a conductive piece, and one end of the moving arc contact 3 is also fixed on the cover body 4 and is connected with one of the first moving main contact 7 and the second moving main contact 8.

Optionally, the conductive member is a fuse 17, the fuse 17 is mounted through the cover, and likewise, the fuse 17 is defined in the first cavity when the cover 4 is connected to the base 1; the two ends of the fuse 17 are respectively connected with the first moving main contact 7 and the second moving main contact 8, the optional fuse 17 is connected in series between the first moving main contact 7 and the second moving main contact 8, the movable arc contact 3 can be arranged to be connected with the second moving main contact 8, and the movable arc contact 3 is not connected with the first moving main contact 7.

Referring to fig. 2, which is another schematic structural view of an isolating switch according to an embodiment of the present utility model, fig. 2 is a schematic plan view of the isolating switch looking into an opening of the base 1 toward the cover 4. The isolating switch provided by the embodiment of the utility model, optionally, further comprises a first connecting terminal 14 and a second connecting terminal 15, wherein the first connecting terminal 14 is connected with the first stationary main contact 5 after being connected with the base 1, and the second connecting terminal 15 is connected with the second stationary main contact 6 after being connected with the base 1. Normally, the first wiring terminal 14 and the second wiring terminal 15 are connected with the wires respectively, and then are connected with the first fixed main contact 5 and the second fixed main contact 6 after being connected into the base 1; the first connection terminal 14 and the second connection terminal 15 may be fixed to the base 1 by bolts.

The isolating switch provided by the embodiment of the utility model can be selected as a fully-insulated isolating switch, the base 1 and the cover body 4 define a closed first cavity to encapsulate the static knife assembly, the movable knife assembly and the arc extinguishing device, and the base 1 and the cover body 4 are made of insulating materials, such as plastics. Further, in order to prevent water from entering, a waterproof baffle 10 is optionally arranged at the joint of the base 1 and the cover 4 to prevent water from splashing. The first wiring terminal 14 is to be connected into the base 1, and a waterproof joint 16 is optionally arranged between the first wiring terminal 14 and the base 1 to prevent water from entering from the joint of the base 1 and the first wiring terminal 14; likewise, a waterproof joint 16 may be provided between the second connection terminal 15 and the base 1.

In the structure provided by the embodiment of the utility model, the static arc contact 9 is arranged in the arc extinguishing device 2, and the moving arc contact 3 enters the arc extinguishing device 2 along with the rotation of the cover body 4 to be contacted with the static arc contact 9. Optionally, the arc extinguishing device 2 includes a housing, a second cavity is formed inside the housing, the static arc contact 9 is disposed in the second cavity, an arc is generated in the second cavity when the moving arc contact 3 and the static arc contact 9 are separated or closed, the arc is extinguished in the second cavity through the internal arrangement of the arc extinguishing device 2, and the arc is not discharged out of the housing of the arc extinguishing device 2. The surface of the shell is provided with a through hole 11, and the through hole 11 is used for the moving arc contact 3 to enter and exit the second cavity defined by the shell of the arc extinguishing device 2.

In the structure provided by the embodiment of the utility model, the moving arc contact 3 enters and exits the arc extinguishing device 2 through the through hole 11, and optionally, the moving arc contact 3 is arranged to always pass through the through hole 11 at the same position in the moving process along with the cover body 4, so that the sealing treatment of the arc extinguishing device 2 is facilitated, and the residual arc is not leaked from the through hole 11 of the arc extinguishing device after the moving arc contact 3 is withdrawn or inserted from the arc extinguishing device 2 during switching on and off. Specifically, in the embodiment, the movable arc contact 3 is configured to form a circular arc structure, a first end of the circular arc structure is fixed on the cover body 4 and is connected with the first movable main contact 7 and the second movable main contact 8, and a circle center of the circular arc structure coincides with a shaft center of the rotating shaft, so that when the cover body 4 rotates around the rotating shaft, the movable arc contact 3 of the circular arc structure always moves on a circle with the shaft center of the rotating shaft as the circle center and a distance from the shaft center of the rotating shaft to a second end of the circular arc structure as a radius; the distance from the axis of the rotating shaft to the second end of the circular arc structure is equal to the distance from the axis of the rotating shaft to the through hole 11, the movable arc contact 3 of the circular arc structure always passes through the through hole 11 in the process of entering and exiting the arc extinguishing device 2, and the shape and the size of the through hole 11 can be set to be suitable for the section of the circular arc structure of the movable arc contact 3.

Further, in order to further improve the sealing effect of the arc extinguishing device 2, the size of the through hole 11 is slightly larger than the cross section of the circular arc structure of the moving arc contact 3, and a sealing piece made of elastic material is arranged in the through hole 11, and the surface opening of the sealing piece is used for the moving arc contact 3 to pass through. The sealing element can be provided with a cross-shaped or rice-shaped opening, the cross-shaped or rice-shaped opening has small gap, and each side face of the movable arc contact 3 can be sealed, the sealing element can be made of high-temperature resistant, soft and elastic materials, and the sealing element can be ensured to better seal an electric arc after being subjected to certain electric life times.

Optionally, if the circle center of the circular arc structure of the moving arc contact 3 is not coincident with the axis of the rotating shaft, when the second contact surface 91 of the static arc contact 9 is fixedly arranged, the relative distance between the second contact surface 91 and the first contact surface 31 in the process of contacting the moving arc contact 3 with the static arc contact is changed, at this time, the circle center of the cambered surface of the first contact surface 31 is not deviated too far from the axis of the rotating shaft, and the static arc contact 9 is mounted on the base 1 or the arc extinguishing device 2 through an elastic piece, and the position of the second contact surface 91 can be adaptively adjusted within a certain range due to the arrangement of the elastic piece, so that the second contact surface 91 can be always kept in contact with the first contact surface 31 in the process of contacting the moving arc contact 3 with the static arc contact 9. And the elastic member provides a force so that the second contact surface 91 can be brought into close contact with the first contact surface 31 to ensure a small contact resistance. Furthermore, when the circle center of the circular arc structure of the movable arc contact 3 is coincident with the axis of the rotating shaft, the static arc contact can also be mounted on the base 1 or the arc extinguishing device 2 through an elastic piece. By the action of the elastic piece, when the static arc contact 9 is not in contact with the moving arc contact 3, the static arc contact 9 can extend out of a small distance from the contact position of the moving arc contact 3. One of the benefits of this is that the elastic member can be compressed when the static arcing contact 9 contacts the moving arcing contact 3, providing a force to compress the static arcing contact 9 and the moving arcing contact 3, ensuring that the first contact surface 31 and the second contact surface 91 are in close contact; in addition, after the static arc contact 9 and the moving arc contact 3 are ablated for a plurality of times, the contact surface of the static arc contact 9 and the moving arc contact 3 can be consumed to a certain extent, in order to avoid the situation that the static arc contact 9 and the moving arc contact 3 cannot be contacted after the contact surface of the static arc contact 9 and the moving arc contact 3 is consumed, the static arc contact 9 can be optionally installed through an elastic piece, and the static arc contact 9 is arranged to extend out of the contact position of the static arc contact 9 and the moving arc contact 3 for a small distance when the static arc contact 9 is not contacted with the moving arc contact 3, so that the margin that the contact surface material of the static arc contact 9 and the moving arc contact 3 is consumed is provided.

In the structure provided by the embodiment of the utility model, after the movable arc contact 3 enters the second cavity through the through hole 11, the movable arc contact contacts with the static arc contact 9 arranged in the second cavity; alternatively, the moving arc contact 3 and the static arc contact 9 can stop moving after contacting, or the moving arc contact 3 and the static arc contact 9 continue moving after contacting, and the moving arc contact 3 keeps sliding contact with the static arc contact 9 in the moving process. In the embodiment, the moving arc contact 3 is arranged to form a circular arc structure, the first contact surface 31 on the moving arc contact 3 is determined to be used for contacting with the static arc contact 9, the first contact surface 31 is in a cambered surface structure, and the second contact surface 91 on the static arc contact 9 is determined to be used for contacting with the first contact surface 31 of the moving arc contact 3. Because the static arc contact 9 is fixed in the arc extinguishing device 2 and is fixed, the first contact surface 31 is of an arc surface structure, the contact between the static arc contact 9 and the moving arc contact 3 can be realized by sliding the second contact surface 91 on the arc surface of the first contact surface 31, the sliding contact arc contact structure has a longer contact stroke, the cover body 4 can be allowed to rotate continuously after the cover body 4 is rotated to enable the static arc contact 9 to be in contact with the moving arc contact 3, and the second moving main contact 8 and the second static main contact 6 are contacted after the static arc contact 9 is in contact with the moving arc contact 3.

Optionally, the second contact surface 91 of the static arc contact 9 is of a curved surface structure, when the second contact surface 91 slides on the curved surface of the first contact surface 31, the first contact surface 31 of the curved surface structure is tangent to the second contact surface 91 of the curved surface structure, the contact part can be seen as point contact, and in the embodiment, the first contact surface 31 and the second contact surface 91 are in sliding point contact, so that the contact resistance is ensured to be smaller. Optionally, the second contact surface 91 of the curved surface structure is a spherical surface or an arc surface structure.

In the structure provided by the embodiment of the utility model, optionally, in the process that the cover body 4 rotates around the rotating shaft to enable the moving arc contact and the static arc contact to never contact, one end of the cambered surface structure of the first contact surface 31 of the moving arc contact 3, which is firstly contacted with the second contact surface 91, is covered with an ablation-resistant and wear-resistant metal material, and the second contact surface 91 of the static arc contact is also covered with an ablation-resistant and wear-resistant metal material, so that the service lives of the moving arc contact 3 and the static arc contact 9 are prolonged. Further, the part, which is not contacted with the static arc contact, of the movable arc contact 3 is optionally covered with an insulating material, for example, plastic insulation is performed for fixation, so that after the isolating switch is closed in place, no metal part of the arc extinguishing device 2 is exposed, and the part, which extends out of the shell of the arc extinguishing device 2, of the movable arc contact 3 has a creepage distance of a sufficient length, so that insulation safety is ensured.

In the isolating switch provided by the embodiment of the utility model, the static arc contact 9 is arranged in the arc extinguishing device 2, the arc generated by the arc contact structure is extinguished through the arc extinguishing device 2, and referring to fig. 3, a specific internal structure schematic diagram of the arc extinguishing device 2 in the isolating switch provided by the embodiment of the utility model is shown, the static arc contact 9 is fixedly arranged in the arc extinguishing device 2, the shell surface of the arc extinguishing device 2 is not only provided with a through hole 11 for the moving arc contact 3 to enter and exit, but also provided with an exhaust opening 19 for discharging hot gas generated by a power supply arc. Further, the arc extinguishing device further includes: the gas generating piece 18 is arranged at one side of the moving arc contact in the second cavity; an air passage formed in the second cavity, wherein an air inlet of the air passage faces the air generating piece 18, and an air outlet of the air passage faces the air exhaust opening 19; a grid assembly 12 disposed within the airway; and an arc baffle 13 is arranged between the exhaust opening 19 and the air outlet of the air flue, and a heat radiation hole is arranged on the arc baffle 13.

According to the arc extinguishing device 2 provided by the embodiment of the utility model, the exhaust opening 19 is formed in one surface of the shell of the arc extinguishing device 2, and hot air in the second cavity can be discharged from the exhaust opening 19 during arc extinguishing; considering that the hot air generated by arc extinction has small specific gravity, the hot air floats upwards under the action of cold air with large specific gravity, optionally, when the arc extinguishing device 2 is installed on the isolating switch, the exhaust opening 19 is ensured to be arranged at the top of the shell, for example, the top surface or the side surface of the shell is close to the top, so that the heat generated in the second cavity is conveniently discharged from the exhaust opening at the top, and the heat discharge is facilitated.

According to the arc extinguishing device provided by the embodiment of the utility model, the arc temperature generated by the movable arc contact 3 and the static arc contact 9 in the second cavity is high, and can reach 3000-30000 ℃ generally, so that a large amount of heat can be accumulated in the second cavity, and the cavity needs to be discharged in a short time. In the arc extinguishing device 2 provided by the embodiment of the utility model, the gas generating piece 18 is optionally arranged, and gas is generated by the gas generating material on the gas generating piece 18 under the corrosion of the arc, so that the arc can be cooled, and the heat in the cavity can be timely discharged from the exhaust opening. Optionally, the gas generating member 18 includes a first surface facing the moving arc contact member 3 after the moving arc contact 3 enters the second cavity, that is, the first surface is made of a gas generating material, when the arc is generated, the gas generating member can quickly absorb heat, and a large amount of gas is discharged to help the arc enter the grid assembly 12 to extinguish the arc, and meanwhile, the released gas generates air pressure to discharge the heat generated by the arc out of the arc extinguishing device.

Further, the gas generating element is arranged at one side of the moving arc contact 3 in the inner moving path of the second cavity, the moving arc contact 3 moves on the inner moving path and contacts with the static arc contact 9 to generate an open arc, and therefore the gas generating element is arranged beside the inner moving path of the moving arc contact 3 so as to receive the arc. The gas generating part is optionally arranged at part or all of the length of the internal movement path of the moving arc contact 3, and when the arc extinguishing device 2 is installed on the isolating switch, the gas generating part is optionally arranged at one side of the internal movement path of the moving arc contact 3, which is close to the bottom of the second cavity, so that the gas generating part 18, the moving arc contact 3, the static arc contact 8, the air passage and the arc baffle 13 are sequentially arranged in the second cavity from bottom to top, and heat is conveniently discharged. Alternatively, the first surface of the gas generating member 18 may be disposed around the movement path of the movable arcing contact 3 in the second cavity, for example, a first surface of a half circumferential surface is disposed beside the movement path of the movable arcing contact 3 in the second cavity, and a gap is left on the first surface, so that the generated gas can be discharged. The gas-generating member 18 has a thickness capable of withstanding arc erosion.

Optionally, the minimum distance between the moving arc contact 3 and the first surface of the gas generating member 18 in the moving process of the moving arc contact 3 is a first distance, because the surface of the moving arc contact 3 may be an arc surface, the first surface may not be a planar structure, in the moving process of the moving arc contact 3, the distance between any point on the moving arc contact 3 and any point on the first surface may be different, the minimum distance between any point on the moving arc contact 3 and any point on the first surface is set to be the first distance, by setting the first distance, the gas generating member 18 can realize the ablation gas emission, and the gas generating effect cannot be generated due to too close arrangement, and the failure distance of the gas generating member 18 can be set according to the self-characteristics of the gas generating member. Further, the first distance is set to be the shortest distance not smaller than the failure distance of the gas generating member, and the longest distance not larger than the distance that the electric arc generated by the moving arc contact 3 and the static arc contact 9 can excite the gas generating member 18 to discharge gas. Alternatively, if the first distance is between 4mm and 10mm, there is a risk that the gas generating member 18 will fail below 4mm, and there is a risk that an arc above 10mm will not trigger the gas generating member 18 to discharge a significant amount of gas to assist in arc discharge.

According to the arc extinguishing device provided by the embodiment of the utility model, arc extinguishing is performed by adopting the arc extinguishing grid plates, the grid plate assembly 12 is arranged in the air passage, optionally, the grid plate assembly 12 comprises a plurality of arc extinguishing grid plates which are arranged in parallel, the arc extinguishing grid plates participate in conduction and the arc extinguishing grid plates do not participate in conduction, the arc extinguishing device is shown by referring to fig. 3, one internal structure realization diagram of the arc extinguishing device 2 is shown when the arc extinguishing grid plates participate in conduction, the grid plate assembly 12 comprises a plurality of arc extinguishing grid plates which are arranged in parallel, one side of each arc extinguishing grid plate is provided with a notch, the notches of the arc extinguishing grid plates form an arc extinguishing channel, and the arc extinguishing channel is arranged on a moving path of the moving arc contact 3 in the second cavity. Optionally, each arc-extinguishing gate sheet has the same structure and can be arranged in parallel in one direction, each arc-extinguishing gate sheet is provided with a notch at the same end, the shapes and the sizes of the notches can be the same, and the shapes of the notches can be square or other shapes, so that the notches of each arc-extinguishing gate sheet jointly form an arc-extinguishing channel. The arc extinguishing channel is arranged on the moving path of the moving arc contact 3 in the second cavity, so that the moving arc contact 3 can move in the arc extinguishing channel after entering the second cavity, and an arc generated by the breaking of the moving arc contact 3 and the static arc contact 9 can enter the arc extinguishing channel.

In this embodiment, the arc extinguishing bars are to participate in conduction, one arc extinguishing bar closest to the static arc contact 9 of the arc extinguishing bars arranged in parallel needs to be directly connected to the static arc contact 9 or directly connected to the first static main contact 5 or the second static main contact 6, and the thickness of the arc extinguishing bar closest to the static arc contact 9 of the arc extinguishing bars arranged in parallel is thicker than that of the other arc extinguishing bars; when the moving arc contact 3 moves in the arc extinguishing channel, the moving arc contact 3 is not directly connected with each arc extinguishing grid piece, and each arc extinguishing grid piece keeps a certain gap with the moving arc contact 3. In the device provided by the embodiment of the utility model, one arc extinguishing grid sheet closest to the static arc contact 9 participates in conduction, so that the guiding of an electric arc is facilitated when the moving arc contact 3 and the static arc contact 9 are separated, and the extinction of the electric arc is facilitated. The movable arc contact 3 and the static arc contact 9 are connected and separated firstly, the contact surface is covered with ablation-resistant metal, and the like, so that the main contact of the switch mechanism can be well protected even if the arc ablation contact is an ablation arc contact and cannot be ablated.

The scheme that the arc extinguishing device 2 provided by the embodiment of the utility model does not participate in conduction is also provided, referring to fig. 4, another schematic structural diagram of the arc extinguishing device 2 in the isolating switch provided by the embodiment of the utility model is shown, the arc extinguishing device in the embodiment does not participate in conduction, referring to fig. 4, the grid assembly 12 comprises a plurality of parallel arc extinguishing grid pieces, the plurality of arc extinguishing grid pieces are arranged beside a motion path of the moving arc contact 3 in the second cavity, optionally, the plurality of arc extinguishing grid pieces are arranged along a direction parallel to the motion direction of the moving arc contact 3, and the parallel arc extinguishing grid pieces cover the whole motion path of the moving arc contact 3 in the second cavity; when the movable arc contact 3 moves in the second cavity, the distance between each arc extinguishing grid piece and the movable arc contact 3 is not lower than a set distance.

Referring to fig. 4, the arc extinguishing bars do not participate in conduction, and a plurality of parallel arc extinguishing bars cover the whole movement path from the separation of the moving arc contact 3 and the static arc contact 9 to the separation of the moving arc contact 3 from the second cavity, so that the arc extinguishing bars can work at each stage and position of arc generation. In addition, in the moving process of the moving arc contact 3, each arc extinguishing gate sheet keeps a certain gap distance with the moving arc contact 3, so that the arc extinguishing gate sheet does not participate in the conducting process when the arc extinguishing device of the embodiment is applied to a switching mechanism. Optionally, when the arc extinguishing device 2 is mounted on the isolating switch, the static arc contact 9 is arranged at the bottom of the second cavity or near the bottom, the moving path of the moving arc contact 3 is also limited at the bottom of the second cavity or near the bottom, the grid plate assembly can be arranged at the middle of the second cavity, the arc extinguishing grid plates in the grid plate assembly are arranged in parallel, and the gaps between the adjacent arc extinguishing grid plates can be communicated with the exhaust openings at the bottom of the second cavity and the top of the cavity, so that the hot air flow at the bottom of the second cavity can be discharged from the exhaust openings.

In the device provided by the embodiment of the utility model, the arc extinguishing grid sheet participates in the scheme of electric conduction, and has a heat conduction effect besides the electric conduction effect, so that the arc extinguishing grid sheet can absorb the heat energy of an arc and help to dissipate heat; in the scheme that the arc-extinguishing grid sheets do not participate in electric conduction, the arc-extinguishing grid sheets are mainly used for achieving heat conduction, and the arc-extinguishing grid sheets are arranged in the air passage, so that a better arc-extinguishing effect is achieved, arc heat can be consumed as soon as possible, and hot air flow can be discharged as soon as possible.

According to the arc extinguishing device provided by the embodiment of the utility model, the arc baffle 13 is arranged between the air passage air outlet and the exhaust opening, hot air in the second cavity is exhausted from the air passage air outlet after passing through the air passage, a small amount of electric arcs can be possibly exist in the hot air exhausted from the air passage air outlet, and the arc baffle 13 has the function of allowing the hot air to be exhausted but preventing the electric arcs from being exhausted. Optionally, at least two parallel arc baffles 13 are disposed at the exhaust opening 19, and heat dissipation holes on the at least two arc baffles 13 are staggered. Furthermore, each arc baffle 13 can be provided with a plurality of small holes as heat dissipation holes, the small holes can be symmetrically distributed or scattered on the arc baffles 13, the small holes on different arc baffles 13 can be arranged in a staggered manner or are opposite to each other, and the electric arcs can be further prevented from flowing out when the small holes on different arc baffles 13 are arranged in a staggered manner.

Optionally, the shortest distance between the arc baffle 13 closest to the grid assembly and the grid assembly 12 is not less than 5mm. The distance between the arc baffle 13 closest to the grid assembly and the grid assembly 12 is set such that the gas passing through the grid assembly 12 has a buffer channel before reaching the nearest arc baffle 13, and is further set to be not less than 5mm.

According to the isolating switch provided by the embodiment of the utility model, by setting the action logic of the arc contact structure and the main contact structure, when the switch is closed, the first moving main contact 7 is contacted with the first static main contact 5 first, the moving arc contact 3 is contacted with the static arc contact 9 again, and the second moving main contact 8 is contacted with the second static main contact 6 last; during opening, the second moving main contact 8 is separated from the second static main contact 6, the moving arc contact 3 is separated from the static arc contact 9, and the first moving main contact 7 is separated from the first static main contact 5, so that an electric arc is generated on the moving arc contact 3 and the static arc contact 9 and extinguished by the arc extinguishing device 2 during opening and closing, no external electric arc is generated in the main contact structure during opening and closing, and no external ablation is generated on the contact. In the embodiment, in order to ensure that the arc can be extinguished in a shorter time, the arc extinguishing system 2 adopts a gas generating material and an arc extinguishing grid sheet to carry out arc extinguishing and heat dissipation, and further the contact surface on the arc contact structure is covered with an ablation-resistant and wear-resistant contact material, so that the service life of the isolating switch is prolonged; the isolating switch is subjected to various insulating treatments, so that the isolating switch can be fully insulated during normal operation, the safety of operators can be effectively protected, the safety can be ensured even if the operators touch the shell during the operation process, and electric shock accidents are avoided.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.

Claims

1. The isolating switch with the arc extinguishing device is characterized by comprising a base, a cover body, a static knife assembly, a movable knife assembly and the arc extinguishing device;

2. The isolating switch with an arc extinguishing device according to claim 1, wherein the arc extinguishing device comprises a shell, a through hole is arranged on the surface of the shell, a second cavity is formed inside the shell, and the static arc contact is arranged in the second cavity;

3. The isolating switch with the arc extinguishing device according to claim 2, wherein the moving arc contact comprises a first contact surface of an arc surface structure, and the static arc contact comprises a second contact surface; when the cover body rotates around the rotating shaft to enable the movable arc contact to be in contact with the static arc contact, the second contact surface can slide on the cambered surface of the first contact surface.

4. The disconnector with arc extinguishing device according to claim 2, characterized in that the housing surface of the arc extinguishing device is further provided with an exhaust opening;

The arc extinguishing device further includes:

The grid plate assembly is arranged in the air passage;

5. The isolating switch with an arc extinguishing device according to claim 4, wherein the gas generating member comprises a first surface which faces the moving arc contact after the moving arc contact enters the second cavity, a minimum distance between the moving arc contact and the first surface in a moving process of the moving arc contact is a first distance, an arc generated by the moving arc contact and the static arc contact in the first distance can excite the gas generating member to discharge gas, and the first distance is not smaller than a failure distance of the gas generating member.

6. The isolating switch with an arc extinguishing device according to claim 4, wherein the grid plate component comprises a plurality of arc extinguishing grid plates which are arranged in parallel, a notch is arranged on one side of each arc extinguishing grid plate, the notches of the arc extinguishing grid plates form an arc extinguishing channel, and the arc extinguishing channel is arranged on the moving path of the moving arc contact in the second cavity; and among the arc extinguishing grid sheets which are arranged in parallel, the arc extinguishing grid sheet closest to the static arc contact is connected with the static arc contact, and the thickness of the arc extinguishing grid sheet is thicker than that of all the rest arc extinguishing grid sheets.

7. The isolating switch with the arc extinguishing device according to claim 4, wherein the grid plate assembly comprises a plurality of arc extinguishing grid plates which are arranged in parallel, and the plurality of arc extinguishing grid plates are arranged beside a movement path of the moving arc contact in the second cavity and cover the whole movement path of the moving arc contact in the second cavity; when the movable arc contact moves in the second cavity, the distance between each arc extinguishing grid piece and the movable arc contact is not lower than a set distance.

8. The isolating switch with an arc extinguishing device according to claim 4, wherein the arc extinguishing device comprises at least two arc baffles arranged in parallel, heat dissipation holes on the at least two arc baffles are arranged in a staggered mode, and the shortest distance between the arc baffle closest to the grid assembly and the grid assembly is not less than 5mm.

9. The isolating switch with an arc extinguishing device according to any one of claims 1 to 8, wherein the conductive member is a fuse, the fuse is mounted through the cover and connected to the first moving main contact and the second moving main contact, and the moving arcing contact is connected to the second moving main contact.

10. The isolating switch with the arc extinguishing device according to claim 1, further comprising a first wiring terminal and a second wiring terminal, wherein the first wiring terminal is connected with the first stationary main contact after being connected with the base, and the second wiring terminal is connected with the second stationary main contact after being connected with the base;