Arc extinguish chamber structure and circuit breaker or isolating switch

Abstract

The utility model discloses an arc extinguish chamber structure and circuit breaker or disconnecting switch, including: base, a plurality of arc extinguish grid sheet group, first side plate and second side plate, said first side plate and second side plate are arranged symmetrically, and there is spacing between first side plate and second side plate, said second side plate is provided with a plurality of arc extinguish grid sheet group, said arc extinguish grid sheet group is provided with a plurality of arc extinguish grid sheet group, and said second side plate is provided with a plurality of arc extinguish grid sheet group. The plurality of arc extinguishing grid sheet groups are positioned between the first side plate and the second side plate, the upper ends of the first side plate and the second side plate are respectively fixed on two sides of the base, and the arc extinguishing device further comprises an air blowing assembly and an arc isolating device. Compared with the prior art, the arc extinguish chamber is simple in structure, and electric arcs can enter the arc extinguish chamber more easily; and the arc can be isolated in the arc extinguishing chamber through the arc isolating device, so that zero flashover is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing chamber structure. Background Art

[0002] In industrial low-voltage power systems, circuit breakers and disconnectors are the most important electrical equipment in distribution systems and new energy systems. With the continuous increase in system voltage, the performance requirements for circuit breakers and disconnectors are becoming higher and higher. Miniaturization, high voltage, zero arcing and high reliability are the main development directions of circuit breakers and disconnectors at this stage.

[0003] With the development of electric power, the operating voltage of the power system has been continuously improved, with the AC voltage as high as AC1500V and the DC voltage also increased to DC2500V. At the same time, since the DC system does not have a natural zero-crossing phenomenon relative to the AC system current, it cannot extinguish the arc at the moment when the AC current crosses zero like the AC current. It can only rely on quickly lengthening and cooling the arc to make the arc voltage exceed the power supply voltage, and then extinguish the arc. Therefore, arc extinguishing is more difficult. At the same time, there is a zero arcing requirement for circuit breakers or disconnectors, and it is difficult for existing arc extinguishing chambers to meet this requirement.

[0004] Therefore, the utility model needs to provide an arc extinguishing chamber structure with a simple structure and better convenience for the arc to enter the arc extinguishing chamber; the tail of the grid is lengthened and arranged in a staggered manner to increase the cooling capacity of the grid and avoid breakdown of the tail; the legs of the grid are lengthened to have a certain magnetic blowing effect on the arc. Utility Model Content

[0005] The purpose of the utility model is to provide an arc extinguishing chamber structure, so as to solve the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] An arc extinguishing chamber structure, comprising: a base, a plurality of arc extinguishing grid groups, a first side plate and a second side plate, wherein the first side plate and the second side plate are symmetrically arranged, and a spacing is provided between the first side plate and the second side plate, the plurality of arc extinguishing grid groups are located between the first side plate and the second side plate, and the upper ends of the first side plate and the second side plate are respectively fixed to two sides of the base;

[0008] A plurality of arc extinguishing grid groups, each of which is composed of a plurality of arc extinguishing grids.

[0009] It also includes an air blowing assembly, which is located at the lower end of the plurality of arc extinguishing grid groups, and is used to increase the pressure and push the arc to quickly enter the arc extinguishing chamber;

[0010] The air blowing assembly comprises a first air blowing member and a second air blowing member, an air passage is provided between the first air blowing member and the second air blowing member, and a plurality of installation grooves arranged in sequence and in parallel are provided on the side of the first air blowing member and the second air blowing member close to the arc extinguishing grid, and the installation grooves are used to install the arc extinguishing grid;

[0011] It also includes an arc isolation device, which is used to isolate the arc inside the arc extinguishing chamber to achieve zero arcing. The arc isolation device is located on the upper part of the base and is fixed by a fixing member.

[0012] The arc-isolating device comprises an upper cover, a densely woven net, a net plate and a plurality of air guide plates, wherein the densely woven net, the net plate and the plurality of air guide plates are all installed in the cavity of the upper cover.

[0013] Furthermore, the arc extinguishing grid includes: a first part, a second part, a first extension leg and a second extension leg, the first part is located at the upper part of the second part, the length of the first part is smaller than the first extension leg and the second extension leg is located at the lower part of the second part, a channel is provided between the first extension leg and the second extension leg, and a U-shaped groove is also provided on the second part near the channel, the center line of the U-shaped groove along the S direction is not in a straight line with the center line of the channel, and the width of the U-shaped groove is smaller than the width of the channel.

[0014] Furthermore, the arc extinguishing grid thickness is set to two or more types.

[0015] Furthermore, the upper ends of the first side plate and the second side plate are fixed to two sides of the base via a concave-convex structure.

[0016] Furthermore, a plurality of protruding structures are provided on both sides along the length direction of the base, and a plurality of concave holes are provided on the first side plate and the second side plate corresponding to the protruding structures.

[0017] Furthermore, the upper cover is also provided with a plurality of ventilation holes.

[0018] Furthermore, a plurality of limiting grooves are provided on the inner surfaces of both ends along the length of the upper cover, and the limiting grooves are used to limit the densely woven mesh and the mesh plate.

[0019] Furthermore, the mesh plate is a double-layer mesh plate.

[0020] Furthermore, the air guide plates are stacked in sequence along the length direction of the upper cover, and both inner walls on the sides of the upper cover in the length direction are provided with slots for installing the air guide plates.

[0021] The utility model also provides a circuit breaker or disconnector, comprising the above-mentioned arc extinguishing chamber structure.

[0022] The beneficial effects of the utility model are:

[0023] The utility model is provided with an arc isolation device, through which the arc is isolated inside the arc extinguishing chamber to achieve zero arcing. The arc isolation device is located on the upper part of the base and is fixed by a fixing member, which is a bolt, and is simple and convenient to disassemble and assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an exploded view of the arc extinguishing chamber structure of the utility model;

[0025] Figure 2 It is a structural diagram of the arc extinguishing grid of the utility model;

[0026] Figure 3 It is a structural diagram of the arc extinguishing chamber structure of the utility model;

[0027] Figure 4 It is a structural diagram of the arc extinguishing chamber structure of the utility model;

[0028] Figure 5 It is an exploded view of the arc-isolating device of the utility model;

[0029] Figure 6 It is a schematic diagram of an arc extinguishing system composed of an arc extinguishing chamber structure of the utility model.

[0030] Reference numerals:

[0031] Base 1, multiple groups of arc-extinguishing grids 2, a first arc-extinguishing grid group 201, a second arc-extinguishing grid group 202, a first side plate 3, a second side plate 4, an arc-extinguishing grid 5, a first part 501, a second part 502, a first extension leg 503, a second extension leg 504, a channel 505, a U-shaped groove 506, a riveted protrusion 507, an air blowing assembly 6, a first air blowing member 601, a second air blowing member 602, an air duct 603, a mounting groove 604, an arc-striking sheet 7, an arc-striking portion 701, a concave hole 8, an arc-isolating device 9, an upper cover 901, an air hole 9011, a densely woven mesh 902, a mesh plate 903, and an air guide plate 904. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.

[0033] Among them, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0036] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0037] like Figures 1 to 6 As shown, an arc extinguishing chamber structure includes: a base 1, a plurality of arc extinguishing grid groups 2, a first side plate 3 and a second side plate 4, wherein the first side plate 3 and the second side plate 4 are symmetrically arranged, and a spacing is provided between the first side plate 3 and the second side plate 4, the plurality of arc extinguishing grid groups 2 are located between the first side plate 3 and the second side plate 4, and the upper ends of the first side plate 3 and the second side plate 4 are respectively fixed on both sides of the base 1;

[0038] Multiple groups of arc-extinguishing grids 2. In this embodiment, the multiple groups of arc-extinguishing grids are divided into a first arc-extinguishing grid group 201 and a second arc-extinguishing grid group 202. Each group of the arc-extinguishing grids is composed of a plurality of arc-extinguishing grids 5. The thickness of the arc-extinguishing grids in the first arc-extinguishing grid group 201 is greater than the thickness of the arc-extinguishing grids in the second arc-extinguishing grid group 202, thereby ensuring that the number of grids can be increased while the overall volume of the arc-extinguishing chamber remains unchanged, thereby increasing the arcing voltage. In the actual practical process, according to actual needs, the thickness of the arc-extinguishing grid 5 can also be set to more than two thicknesses; specifically limited according to actual needs;

[0039] It also includes an air blowing assembly 6, which is located at the lower end of the plurality of arc extinguishing grid groups, and is used to increase the pressure to push the arc into the arc extinguishing chamber quickly, and the lower ends of the first side plate and the second side plate are fixed to both sides of the air blowing assembly by bolts;

[0040] The air blowing assembly 6 includes a first air blowing member 601 and a second air blowing member 602. In this embodiment, the first air blowing member 601 and the second air blowing member 602 have the same structure and are equal in size. An air passage 603 is provided between the first air blowing member 601 and the second air blowing member 602. The first air blowing member 601 and the second air blowing member 602 are provided with a plurality of mounting grooves 604 arranged in parallel in sequence near the side where the arc extinguishing grid is installed. The mounting grooves 604 are used to install the first extension leg 503 and the second extension leg 504 of the arc extinguishing grid. In order to cooperate with the installation of arc extinguishing grids of different thicknesses, the mounting grooves The width of the slot 604 is also provided with two sizes to meet the requirements of arc extinguishing grids of different thicknesses. In this embodiment, the arc extinguishing grids close to the stationary contact are thicker. The energy contained in the arc at the beginning of arc extinguishing is very large. With the help of the thick arc extinguishing grids, the energy can be absorbed as quickly as possible and converted into heat energy. The thicker arc extinguishing grids mainly function to absorb the energy generated during disconnection; the grids away from the stationary contact are thinner, and the number of grids can be increased without changing the size of the arc extinguishing chamber. As the arc is elongated, the energy contained in it gradually weakens. The main function of this part of the arc extinguishing grids is to increase the arc burning voltage;

[0041] The invention also includes an arc-striking plate 7, wherein the arc-striking plate 7 is located near a thicker arc-extinguishing grid, and an arc-striking portion 701 is provided on the arc-striking plate 7, wherein the arc-striking portion 701 is installed on the lower end of the arc-striking plate 7, and the arc-striking portion 701 extends to the lower end of the arc-extinguishing grid, and the arc-striking portion 701 forms an angle with the lower end of the arc-striking plate 7; and also includes an arc-isolating device, wherein the arc-isolating device is used to isolate the arc inside the arc-extinguishing chamber to achieve zero arcing, and the arc-isolating device is located on the upper part of the base and fixed by a fixing member.

[0042] The arc-isolating device 9 comprises: an upper cover 901, a densely woven mesh 902, a mesh plate 903 and a plurality of air guide plates 904. The densely woven mesh 902, the mesh plate 903 and the plurality of air guide plates 904 are all installed in the cavity of the upper cover 901. In the present embodiment, the mesh plate 903 is a double-layer mesh plate. During installation, the densely woven mesh 902 and the two-layer mesh plates 903 are spaced apart from each other. When the electric arc passes through the arc extinguishing chamber and is extinguished, gas and free metal chips are generated. The gas and free metal chips pass through the air guide plate 904 and the two-layer mesh plates 903 in turn. At this time, most of the free metal chips will adhere to the upper side. The densely woven mesh 902 completely isolates the remaining free metal chips inside the arc extinguishing chamber. The gas is discharged from the arc extinguishing chamber through the densely woven mesh 902, thereby achieving zero arcing. In order to discharge the gas generated in the arc extinguishing chamber, the upper cover 901 is also provided with a plurality of air holes 9011.

[0043] In addition, it should be noted that Figure 2 As shown, the arc extinguishing grid 5 includes: a first part 501, a second part 502, a first extension leg 503 and a second extension leg 504. The first part 501 is located at the upper part of the second part 502, and the length of the first part 501 is smaller than that of the first extension leg 503. The second extension leg 504 is located at the lower part of the second part 502. In this embodiment, the first part 501, the second part 502, the first extension leg 503 and the second extension leg 504 are connected and fixed in an integrated manner, so as to ensure that the first part 501, the second part 502, the first extension leg 503 and the second extension leg 504 can be closely connected to each other, and ensure the stability of the arc extinguishing grid structure. A channel 505 is provided between the first extension leg 503 and the second extension leg 504, and a U-shaped groove 506 is further provided on the second part 502 near the channel 505. The center line of the U-shaped groove 506 along the S direction is not in a straight line with the center line of the channel, and the width of the U-shaped groove 506 is smaller than the width of the channel 505.

[0044] During installation, the front and back sides of adjacent arc-extinguishing grids are arranged opposite to each other and arranged in sequence, and a spacing is provided between adjacent arc-extinguishing grids, so that the U-shaped grooves 506 are arranged in a staggered manner. When the arc passes through the U-shaped grooves 506, the arc path is lengthened. When the moving and static contacts generate an arc, the arc can be introduced into the channel 505 earlier, the arc is divided in advance, the voltage of each short arc is reduced, the arc is lengthened, and the arc extinguishing effect of the arc extinguishing chamber is improved.

[0045] In addition, it is worth noting that the first part is divided into two parts along the center line of the S direction, and the length of one side of the first part is greater than the length of the other side of the first part. After several arc-extinguishing grids are installed, adjacent arc-extinguishing grids are not flush along the two sides of the first part of the arc-extinguishing grid.

[0046] In addition, it should be noted that in order to install the arc extinguishing grid 5 between the first side plate 3 and the second side plate 4, a plurality of riveted protrusions 507 are further provided on both sides of the arc extinguishing grid 5, wherein it should be noted that the riveted protrusions on both sides of the arc extinguishing chamber width are not arranged on the same plane, and in order to cooperate with the installation of the riveted protrusions, the first side plate 3 and the second side plate 4 are further provided with riveting holes for cooperating with the riveted protrusions, and the arc extinguishing grid 5 is installed on the first side plate 3 and the second side plate 4 by riveting, with a small number of parts, a simple structure and low cost; in this embodiment, the overall structure of the arc extinguishing chamber is formed by riveting the arc extinguishing grids, and this assembly method is simple to operate and has good stability. Since this assembly method does not occupy the internal space of the arc extinguishing chamber, the first part can be lengthened, thereby increasing the area of ​​the arc extinguishing grid 5 and further improving the cooling capacity of the grid.

[0047] In this embodiment, if Figure 3 As shown, the air passage 603 is in a trumpet shape. When an arc is generated, the first air blowing member 601 and the second air blowing member 602 are heated to generate gas, which increases the air pressure at the arc position. At the same time, the air passage is in a trumpet shape, which makes it easier for the gas to move toward the arc extinguishing chamber. The first air blowing member 601 and the second air blowing member 602 are provided with a mounting groove 604. During installation, the arc extinguishing grid will be installed in the mounting groove 604, thereby preventing the gas from moving in the opposite direction of the arc extinguishing chamber, making it easier for the arc to enter the arc extinguishing chamber.

[0048] It can be known from the above method that since the U-shaped groove 506 is provided on the arc extinguishing grid, the arc is more convenient to enter the arc extinguishing chamber along the U-shaped groove through the setting of the U-shaped groove; in actual installation, the arc extinguishing grids are staggered and the first extension leg 503 and the second extension leg 504 are extended, which is beneficial to increase the cooling capacity of the arc extinguishing grid and avoid tail breakdown. Since the length of the first extension leg 503 and the second extension leg 504 is lengthened, a certain magnetic blowing effect can be played on the arc. In addition, an air blowing assembly is provided at the lower part of the arc extinguishing grid assembly, and the air blowing assembly includes a first air blowing member 601 and a second air blowing member 602. An air duct 603 is provided between the first air blowing member 601 and the second air blowing member 602. The air duct 603 provided is beneficial to increase the air duct pressure and promote the arc to quickly enter the arc extinguishing chamber.

[0049] In addition, it should be noted that the upper ends of the first side panel 3 and the second side panel 4 are fixed to the two sides of the base 1 through a concave-convex structure. Specifically, three convex structures 101 are provided on both sides along the length direction of the base 1. The cross-section of the convex structure 101 is triangular. The first side panel 3 and the second side panel 4 are also provided with three concave holes 8 corresponding to the convex structure 101. The shape of the concave holes 8 is rectangular. When installing, the concave holes are inserted into the convex structure, so that the first side panel 3 and the second side panel 4 are firmly fixed to the two sides of the base 1.

[0050] In order to achieve zero arcing, the present embodiment further includes an arc isolation device 9, which is used to isolate the arc inside the arc extinguishing chamber to achieve zero arcing. The arc isolation device is located on the upper part of the base and is fixed by a fixing member, which is a bolt, and is simple and convenient to disassemble and assemble.

[0051] In addition, it should be noted that Figure 5 As shown, a plurality of limiting grooves are provided on the inner surfaces of both ends along the length of the upper cover 901, and the limiting grooves are used to limit the densely woven mesh 902 and the mesh plate 903, and the densely woven mesh 902 and the two layers of the mesh plate 903 are firmly installed in the cavity of the upper cover 901 to avoid the densely woven mesh 902 and the mesh plate 903 from moving due to force, thereby ensuring that the densely woven mesh 902 and the mesh plate 903 are firmly fixed.

[0052] In addition, in the present embodiment, the air guide plates 904 are stacked in sequence along the length direction of the upper cover 901, and slots are provided on the inner walls on both sides of the length direction of the upper cover, and the slots are used to install the air guide plates. The air guide plates can be firmly fixed in the upper cover through the provided slots. In addition, it should be noted that during installation, the air guide plates are installed at a certain inclination angle, which is conducive to the arc entering the arc isolation device.

[0053] The utility model also provides a circuit breaker or disconnector, comprising the above-mentioned arc extinguishing chamber structure.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. An arc extinguishing chamber structure, characterized in that: include: A base, a plurality of arc-extinguishing grid groups, a first side plate and a second side plate, wherein the first side plate and the second side plate are symmetrically arranged, and a spacing is provided between the first side plate and the second side plate, and the plurality of arc-extinguishing grid groups are located between the first side plate and the second side plate, and the upper ends of the first side plate and the second side plate are respectively fixed to two sides of the base; A plurality of arc extinguishing grid groups, each of which is composed of a plurality of arc extinguishing grids. It also includes an air blowing assembly, which is located at the lower end of the plurality of arc extinguishing grid groups, and is used to increase the pressure and push the arc to quickly enter the arc extinguishing chamber; The air blowing assembly comprises a first air blowing member and a second air blowing member, an air passage is provided between the first air blowing member and the second air blowing member, and a plurality of installation grooves arranged in sequence and in parallel are provided on the side of the first air blowing member and the second air blowing member close to the arc extinguishing grid, and the installation grooves are used to install the arc extinguishing grid; It also includes an arc isolation device, which is used to isolate the arc inside the arc extinguishing chamber to achieve zero arcing, and the arc isolation device is located on the upper part of the base and fixed by a fixing member; The arc isolation device comprises: an upper cover, a densely woven net, a net plate and a plurality of air guide plates, wherein the densely woven net, the net plate and the plurality of air guide plates are all installed in the cavity of the upper cover.

2. The arc extinguishing chamber structure according to claim 1, characterized in that: The arc extinguishing grid comprises: a first part, a second part, a first extension leg and a second extension leg, the first part is located at the upper part of the second part, the length of the first part is smaller than the first extension leg, and the second extension leg is located at the lower part of the second part, a channel is provided between the first extension leg and the second extension leg, and a U-shaped groove is further provided on the second part near the channel, the center line of the U-shaped groove and the center line of the channel along the S direction are not in a straight line, and the width of the U-shaped groove is smaller than the width of the channel.

3. The arc extinguishing chamber structure according to claim 1, characterized in that: The arc extinguishing grid pieces are provided with two or more thicknesses.

4. The arc extinguishing chamber structure according to claim 1, characterized in that: The upper ends of the first side plate and the second side plate are fixed to the two sides of the base through a concave-convex structure.

5. The arc extinguishing chamber structure according to claim 1, characterized in that: A plurality of protruding structures are provided on both sides along the length direction of the base, and a plurality of concave holes are provided at locations of the first side plate and the second side plate corresponding to the protruding structures.

6. The arc extinguishing chamber structure according to claim 1, characterized in that: The upper cover is also provided with a plurality of ventilation holes.

7. The arc extinguishing chamber structure according to claim 6, characterized in that: A plurality of limiting grooves are also provided on the inner surfaces of both ends along the length of the upper cover, and the limiting grooves are used to limit the densely woven mesh and the mesh plate.

8. The arc extinguishing chamber structure according to claim 1, characterized in that: The mesh plate is a double-layer mesh plate.

9. The arc extinguishing chamber structure according to claim 1, characterized in that: The air guide plates are stacked in sequence along the length direction of the upper cover, and both inner walls on the length direction of the upper cover are provided with card slots for installing the air guide plates.

10. A circuit breaker or disconnector, characterized in that: The arc extinguishing chamber comprises the arc extinguishing chamber as described in any one of claims 1 to 9.

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