An arc extinguishing chamber for a circuit breaker and a circuit breaker

Abstract

The utility model relates to a low voltage electric appliance technical field especially is concerned about a kind of arc-extinguishing chamber and circuit breaker for circuit breaker.The utility model provides arc-extinguishing chamber for circuit breaker including shell and metal lattices;Shell includes mutually buckling abutment left arc wall and right arc wall, and the top of left arc wall and the top of right arc wall form gas outlet;Left arc wall is provided with multiple left cylinder, and right arc wall is provided with multiple right cylinder, and left cylinder and right cylinder one-to-one corresponding abutment form cylinder, and cylinder is located at gas outlet, and it is divided into gas outlet;Shell is provided with multiple connecting holes, and connecting hole one-to-one corresponding through cylinder, and connecting hole is equipped with metal fastener.Connecting hole inside left arc wall and right arc wall are connected by metal fastener, not only ensure the stability of left arc wall and right arc wall connection, also increase the mechanical strength at cylinder, avoid arc-extinguishing chamber top structure to be broken, simultaneously reduce or cancel the use of top metal cover plate.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to an arc-extinguishing chamber for a circuit breaker and a circuit breaker. Background Technology

[0002] Currently, circuit breakers have a base plate and multiple arc-extinguishing chambers corresponding to the base plate. When interrupting short-circuit current under high voltage, the top structure of the arc-extinguishing chamber is easily broken under the impact of high energy and high pressure. Therefore, in the existing technology, a metal plate is generally added to the top of the arc-extinguishing chamber to increase the strength of the top structure. However, the metal plate will undergo thermal expansion deformation or softening under the high temperature of the arc, resulting in instability of the outlet structure and a decrease in structural strength. Secondly, under high temperature and high pressure, the metal cover plate may cause the arc to reignite. Utility Model Content

[0003] The purpose of this utility model is to provide an arc-extinguishing chamber and circuit breaker for circuit breakers, in order to solve the technical problems in the prior art where a metal plate is added to the top of the arc-extinguishing chamber, which causes thermal expansion deformation or softening under the high temperature of the electric arc, resulting in instability of the outlet structure and a decrease in structural strength. Furthermore, under high temperature and high pressure, the metal cover plate may cause the electric arc to reignite.

[0004] In a first aspect, the present invention provides an arc-extinguishing chamber for a circuit breaker, comprising: a housing and a metal grid disposed within the housing;

[0005] The housing includes a left diaphragm wall and a right diaphragm wall that interlock and abut against each other, and an air outlet is formed between the top of the left diaphragm wall and the top of the right diaphragm wall.

[0006] The left diaphragm wall is provided with multiple left columns, and the right diaphragm wall is provided with multiple right columns. The left columns and the right columns are connected in a one-to-one correspondence to form columns. The columns are located at the air outlet and divide the air outlet.

[0007] The housing is provided with multiple connection holes, and each connection hole corresponds to and passes through the column. Metal fasteners are installed in the connection holes.

[0008] In an optional embodiment, a middle partition is further included, which is disposed at the end of the metal grid sheet and located at the middle position of the end of the metal grid sheet.

[0009] In an optional embodiment, the top of the intermediate partition is provided with a dovetail boss, and the end of the metal grid is provided with a dovetail groove that matches the dovetail boss.

[0010] The dovetail boss is inserted into the dovetail groove.

[0011] In an optional embodiment, the first side end of the intermediate partition is provided with a first protrusion and a second protrusion, the first protrusion and the second protrusion being used to cooperate with the moving arc-starting plate of the circuit breaker to lock the moving arc-starting plate of the circuit breaker between the first protrusion and the second protrusion.

[0012] In an optional embodiment, the second side end of the intermediate partition is provided with a third protrusion and a fourth protrusion, which are used to cooperate with the stationary arc-drawing plate of the circuit breaker to lock the stationary arc-drawing plate of the circuit breaker between the third protrusion and the fourth protrusion.

[0013] In an optional embodiment, the intermediate partition is made of PPA.

[0014] In an optional embodiment, along the left-right direction of the housing, the surfaces of the left column and the right column that abut against each other are mutually mating concave and convex surfaces.

[0015] In an optional embodiment, along the vertical direction of the housing, the surfaces of the left and right diaphragm walls that abut against each other are stepped surfaces that cooperate with each other.

[0016] In an optional embodiment, a groove is provided at the bottom of the front sidewall of the housing, and the circuit breaker includes a base and a bottom plate, with the base located on the front side of the bottom plate;

[0017] The groove is used to mate with the front sidewall of the base so that the top of the front sidewall of the base is inserted into the groove, and the rear sidewall of the housing is located inside the bottom plate.

[0018] Secondly, this utility model provides a circuit breaker, including the arc-extinguishing chamber for a circuit breaker as described in any of the foregoing embodiments.

[0019] Compared with the prior art, the technical advantages of the arc-extinguishing chamber for circuit breakers and the circuit breaker provided by this utility model are as follows:

[0020] The arc-extinguishing chamber for a circuit breaker provided by this utility model includes: a shell and a metal grid plate disposed within the shell; the shell includes a left and a right arc-extinguishing wall that interlock and abut against each other, and an air outlet is formed between the top of the left and right arc-extinguishing walls; a plurality of left columns are disposed on the left arc-extinguishing wall, and a plurality of right columns are disposed on the right arc-extinguishing wall, with the left and right columns abutting against each other to form columns, the columns being located at the air outlet and dividing the air outlet; a plurality of connecting holes are disposed on the shell, and the connecting holes correspondingly penetrate the columns, with metal fasteners installed in the connecting holes.

[0021] Multiple left and right columns are connected one-to-one to form multiple columns. Multiple connecting holes are provided on the shell, and each connecting hole passes through the column. The left and right diaphragm walls are connected by metal fasteners in the connecting holes. This not only ensures the stability of the connection between the left and right diaphragm walls, but also increases the mechanical strength of the columns, preventing the top structure of the arc-extinguishing chamber from being broken. At the same time, it reduces or eliminates the use of the top metal cover plate, effectively preventing the outlet structure from becoming unstable and the structural strength from decreasing. Furthermore, it avoids the problem of arc reignition under high temperature and high pressure.

[0022] The circuit breaker provided by this utility model includes the arc-extinguishing chamber for the circuit breaker described above. Therefore, the technical advantages and effects achieved by it include the technical advantages and effects achieved by the arc-extinguishing chamber for the circuit breaker described above, which will not be elaborated here.

[0023] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 A front-to-back sectional view of the arc-extinguishing chamber provided in an embodiment of this utility model;

[0026] Figure 2 A left-right sectional view of the arc-extinguishing chamber provided in an embodiment of this utility model;

[0027] Figure 3 A sectional view of the arc-extinguishing chamber, base, and bottom plate provided in an embodiment of this utility model;

[0028] Figure 4 A schematic diagram of one side of the intermediate partition provided in an embodiment of this utility model;

[0029] Figure 5 This is a schematic diagram of the other side of the intermediate partition provided in an embodiment of the present utility model;

[0030] Figure 6 This is a schematic diagram of the metal grid structure provided in an embodiment of the present utility model;

[0031] Figure 7 Left view of the arc-extinguishing chamber, base, and bottom plate provided in this embodiment of the utility model;

[0032] Figure 8Rear view of the arc-extinguishing chamber, base, and bottom plate provided in an embodiment of this utility model;

[0033] Figure 9 Axonometric drawings of the arc-extinguishing chamber, base, and bottom plate provided for embodiments of this utility model;

[0034] Figure 10 A schematic diagram showing the moving arc-inducing plate and the stationary arc-inducing plate installed on the intermediate partition plate, as provided in an embodiment of this utility model;

[0035] Figure 11 A schematic diagram showing a convex surface provided on the left column in an embodiment of this utility model;

[0036] Figure 12 This is a schematic diagram of a concave surface provided on the right column in an embodiment of the present invention.

[0037] Icons: 1-Arc extinguishing chamber; 2-Shell; 3-Metal grid; 4-Left diaphragm wall; 5-Right diaphragm wall; 6-Air outlet; 7-Base plate; 8-Left column; 9-Right column; 10-Column; 11-Connecting hole; 12-Metal fastener; 13-Intermediate partition; 14-Dovetail boss; 15-Dovetail groove; 16-First protrusion; 17-Second protrusion; 18-Moving arc-inducing plate; 19-Third protrusion; 20-Fourth protrusion; 21-Static arc-inducing plate; 22-Stepped surface; 23-Groove; 24-Base; 25-Concave surface; 26-Convex surface. Detailed Implementation

[0038] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0042] The present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0043] The specific structure is as follows: Figures 1 to 12 As shown.

[0044] This embodiment provides an arc-extinguishing chamber 1 for a circuit breaker, comprising: a housing 2 and a metal grid 3 disposed within the housing 2; the housing 2 includes a left arc-extinguishing wall 4 and a right arc-extinguishing wall 5 that are interlocked and abutted against each other, and an air outlet 6 is formed between the top of the left arc-extinguishing wall 4 and the top of the right arc-extinguishing wall 5; a plurality of left columns 8 are disposed on the left arc-extinguishing wall 4, and a plurality of right columns 9 are disposed on the right arc-extinguishing wall 5, and the left columns 8 and right columns 9 are abutted against each other to form a column 10, the column 10 being located at the air outlet 6 and dividing the air outlet 6; a plurality of connecting holes 11 are disposed on the housing 2, and the connecting holes 11 are connected to the column 10, and metal fasteners 12 are installed in the connecting holes 11.

[0045] In this embodiment, multiple left columns 8 and multiple right columns 9 are connected one-to-one to form multiple columns 10. Multiple connecting holes 11 are provided on the housing 2, and the connecting holes 11 are connected through the columns 10 one-to-one. The left arc diaphragm wall 4 and the right arc diaphragm wall 5 are connected in the connecting holes 11 with metal fasteners 12. This not only ensures the stability of the connection between the left arc diaphragm wall 4 and the right arc diaphragm wall 5, but also increases the mechanical strength of the columns 10, preventing the top structure of the arc extinguishing chamber 1 from being broken. At the same time, it reduces or eliminates the use of the top metal cover plate, effectively preventing the structure of the air outlet 6 from becoming unstable and the structural strength from decreasing. Furthermore, it avoids the problem of arc reignition under high temperature and high pressure.

[0046] In this embodiment, the metal fastener 12 can be a screw or rivet, or other components that meet the requirements.

[0047] In the optional technical solution of this embodiment, a middle partition 13 is also included. The middle partition 13 is disposed at the end of the metal grid plate 3 and is located in the middle of the end of the metal grid plate 3. This divides the arc-extinguishing chamber 1 into two cavities, improving the arc-extinguishing effect.

[0048] In the optional technical solution of this embodiment, a dovetail boss 14 is provided on the top of the intermediate partition 13, and a dovetail groove 15 matching the dovetail boss 14 is provided at the end of the metal grid plate 3; the dovetail boss 14 is inserted into the dovetail groove 15. The intermediate partition 13 is connected to the dovetail groove 15 at the end of the metal grid plate 3 through the dovetail boss 14 at the top, ensuring the stability of the connection, so that the intermediate partition 13 can be stably fixed in the arc extinguishing chamber 1, reducing the shaking of the intermediate partition 13 under high pressure, and preventing the electric arc from failing to enter the end of the metal grid plate 3 normally.

[0049] In the optional technical solution of this embodiment, the first side end of the intermediate partition 13 is provided with a first protrusion 16 and a second protrusion 17. The first protrusion 16 and the second protrusion 17 are used to cooperate with the moving arc-leading plate 18 of the circuit breaker to lock the moving arc-leading plate 18 of the circuit breaker between the first protrusion 16 and the second protrusion 17, effectively ensuring the overall stability.

[0050] In the optional technical solution of this embodiment, the second side end of the intermediate partition 13 is provided with a third protrusion 19 and a fourth protrusion 20. The third protrusion 19 and the fourth protrusion 20 are used to cooperate with the stationary arc-leading plate 21 of the circuit breaker to lock the stationary arc-leading plate 21 of the circuit breaker between the third protrusion 19 and the fourth protrusion 20, effectively ensuring the overall stability.

[0051] In the optional technical solution of this embodiment, the material of the intermediate partition 13 is PPA. The material of the intermediate partition 13 is PPA (polyphthalamide), which is resistant to high temperature and ensures the service life of the intermediate partition 13.

[0052] However, this embodiment is not limited to this one; the middle partition 13 can also be made of other materials that meet the requirements.

[0053] In the optional technical solution of this embodiment, along the left-right direction of the housing 2, the surfaces of the left column 8 and the right column 9 that abut against each other are mutually cooperating concave-convex surfaces. The design of the mutually abutting surfaces of the left column 8 and the right column 9 as mutually cooperating concave-convex surfaces, i.e., having an interlaced structure, prevents the metal fastener 12 from contacting the electric arc. The concave-convex surfaces are divided into concave surfaces 25 and convex surfaces 26. Alternatively, the left column 8 may have a concave surface 25 and the right column 9 may have a convex surface 26, or the left column 8 may have a convex surface 26 and the right column 9 may have a concave surface 25.

[0054] In the optional technical solution of this embodiment, along the vertical direction of the shell 2, the surfaces of the left partition wall 4 and the right partition wall 5 that abut against each other are stepped surfaces 22 that cooperate with each other.

[0055] In this embodiment, a connecting hole 11 is also provided at the joint between the left diaphragm wall 4 and the right diaphragm wall 5, and a metal fastener 12 is installed in the connecting hole 11 to ensure the stability of the left diaphragm wall 4 and the right diaphragm wall 5. The joint surfaces of the left diaphragm wall 4 and the right diaphragm wall 5 are designed as mutually mating stepped surfaces 22, i.e., with an interlaced structure, to prevent high-pressure gas leakage and achieve better sealing.

[0056] In the optional technical solution of this embodiment, a groove 23 is provided at the bottom of the front sidewall of the housing 2. The circuit breaker includes a base 24 and a base plate 7. The base 24 is located on the front side of the base plate 7. The groove 23 is used to cooperate with the front sidewall of the base 24 so that the top of the front sidewall of the base 24 is inserted into the groove 23, and the rear sidewall of the housing 2 is located on the inner side of the base plate 7.

[0057] In this embodiment, after the arc-extinguishing chamber 1 is installed on the base 24 and the bottom plate 7, the shell 2 extends beyond the front end of the base 24, and the top of the front side wall of the base 24 is inserted into the groove 23. The rear side wall of the shell 2 is sunk into the bottom plate 7 to ensure the airtightness of the connection between the arc-extinguishing chamber 1 and the base 24 and the bottom plate 7. This avoids the risk of high-pressure gas being ejected from the side due to excessive gaps, which could lead to carbon powder accumulation and cause breakdown.

[0058] The circuit breaker provided in this embodiment includes the arc-extinguishing chamber 1 used for the circuit breaker as described above. Therefore, the technical advantages and effects achieved by the circuit breaker include the technical advantages and effects achieved by the arc-extinguishing chamber 1 used for the circuit breaker as described above, which will not be repeated here.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An arc-extinguishing chamber for a circuit breaker, characterized in that, include: The housing (2) and the metal grid (3) disposed within the housing (2); The housing (2) includes a left diaphragm wall (4) and a right diaphragm wall (5) that are interlocked and abut against each other, and an air outlet (6) is formed between the top of the left diaphragm wall (4) and the top of the right diaphragm wall (5). The left partition wall (4) is provided with a plurality of left columns (8), and the right partition wall (5) is provided with a plurality of right columns (9). The left columns (8) and the right columns (9) are connected in a one-to-one correspondence to form a column (10). The column (10) is located at the air outlet (6) and divides the air outlet (6). The housing (2) is provided with a plurality of connection holes (11), and the connection holes (11) are connected to the column (10) one by one. Metal fasteners (12) are installed in the connection holes (11).

2. The arc-extinguishing chamber for a circuit breaker according to claim 1, characterized in that, It also includes a middle partition (13), which is disposed at the end of the metal grid (3) and located at the middle position of the end of the metal grid (3).

3. The arc-extinguishing chamber for a circuit breaker according to claim 2, characterized in that, The top of the intermediate partition (13) is provided with a dovetail boss (14), and the end of the metal grid plate (3) is provided with a dovetail groove (15) that matches the dovetail boss (14). The dovetail boss (14) is inserted into the dovetail groove (15).

4. The arc-extinguishing chamber for a circuit breaker according to claim 3, characterized in that, The first side end of the intermediate partition plate (13) is provided with a first protrusion (16) and a second protrusion (17). The first protrusion (16) and the second protrusion (17) are used to cooperate with the moving arc-starting plate (18) of the circuit breaker to lock the moving arc-starting plate (18) of the circuit breaker between the first protrusion (16) and the second protrusion (17).

5. The arc-extinguishing chamber for a circuit breaker according to claim 3, characterized in that, The second side end of the intermediate partition plate (13) is provided with a third protrusion (19) and a fourth protrusion (20). The third protrusion (19) and the fourth protrusion (20) are used to cooperate with the stationary arc-leading plate (21) of the circuit breaker to lock the stationary arc-leading plate (21) of the circuit breaker between the third protrusion (19) and the fourth protrusion (20).

6. The arc-extinguishing chamber for a circuit breaker according to claim 2, characterized in that, The intermediate partition (13) is made of PPA.

7. The arc-extinguishing chamber for a circuit breaker according to any one of claims 1-6, characterized in that, Along the left-right direction of the housing (2), the surfaces of the left column (8) and the right column (9) that abut against each other are mutually cooperating concave and convex surfaces.

8. The arc-extinguishing chamber for a circuit breaker according to any one of claims 1-6, characterized in that, Along the vertical direction of the shell (2), the surfaces of the left partition wall (4) and the right partition wall (5) that abut against each other are stepped surfaces (22) that cooperate with each other.

9. The arc-extinguishing chamber for a circuit breaker according to any one of claims 1-6, characterized in that, The bottom of the front sidewall of the housing (2) is provided with a groove (23), and the circuit breaker includes a base (24) and a bottom plate (7), with the base (24) located on the front side of the bottom plate (7); The groove (23) is used to engage with the front sidewall of the base (24) so ​​that the top of the front sidewall of the base (24) is inserted into the groove (23) and the rear sidewall of the housing (2) is located inside the bottom plate (7).

10. A circuit breaker, characterized in that, Includes the arc-extinguishing chamber for a circuit breaker as described in any one of claims 1-9.

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