Mounting structure of circuit breaker arc extinguish chamber cover plate

Abstract

The utility model discloses an installation structure of a cover plate of an arc extinguish chamber of a circuit breaker, which comprises a shell, the shell is provided with a concave cavity used for installing arc extinguish grid sheets, the shell is fixedly provided with a cover plate which is matched with an opening of the concave cavity for closing, the cover plate is provided with a plurality of arc discharge holes, and the arrangement direction of the arc extinguish grid sheets corresponds to the direction of two ends of the cover plate. The two sides of the cover plate are provided with side edges, and the side edges and the shell are connected and fixed through fasteners. The arc-extinguishing grid plate is compact in structure, has higher fixing strength, is beneficial to increasing the installation number of the arc-extinguishing grid plates, and improves the bearing capacity of the circuit breaker.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of installation structure of circuit breaker arc-extinguishing chamber cover plate. BACKGROUND

[0002] The arc-extinguishing chamber of traditional frame type circuit breaker usually includes cover plate, cover body, multiple arc-extinguishing grid fins are arranged in the cavity of cover body, multiple arc-extinguishing grid fins are arranged along the length direction of cover plate, and arc discharge hole is arranged on cover plate. Figure 1 As shown in the figure, cover plate 1 is usually inserted and spliced by two side plates 10 laterally, cover plate 1 has support part 11 at both ends, and round and U-shaped bolt holes (12, 13) are arranged at positions corresponding to the junctions of both side plates 10 at both ends of support part 11. After inserting arc-extinguishing chamber components such as cover body and arc-extinguishing grid fins of arc-extinguishing chamber into the concave cavity of circuit breaker, cover plate 1 is fixed on the shell of circuit breaker by bolts respectively threaded in round and U-shaped two bolt holes.

[0003] The installation structure of the above-mentioned traditional arc-extinguishing chamber cover plate has certain limitation on the installation space of arc-extinguishing grid fins, and cannot accommodate more number of arc-extinguishing grid fins. This leads to that circuit breaker product

[0004] cannot adapt to arc-extinguishing under higher voltage working condition. In addition, there is also the problem of low fixing strength and unfirm fixing. INVENTION CONTENTS

[0005] In order to overcome the defects of the above-mentioned prior art, the utility model provides a kind of installation structure of circuit breaker arc-extinguishing chamber cover plate, which is compact in structure and has higher fixing strength, helps to increase the installation number of arc-extinguishing grid fins, and improves the carrying capacity and arc-extinguishing capacity of circuit breaker.

[0006] The installation structure of circuit breaker arc-extinguishing chamber cover plate of the utility model includes a shell, a concave cavity for installing arc-extinguishing grid fins is arranged on the shell, a cover plate for closing the opening of the concave cavity is fixedly installed on the shell, multiple arc discharge holes are arranged on the cover plate, the arrangement direction of arc-extinguishing grid fins corresponds to the direction of both ends of cover plate, the side edge is arranged on both sides of cover plate, the side edge and the shell are connected and fixed by fastener, the cover plate is fixed by cooperating with the shell through the side edge on both sides of cover plate, the space in the concave cavity along the arrangement direction of arc-extinguishing grid fins is reduced, so that more number of arc-extinguishing grid fins can be accommodated in the concave cavity. In addition, the fixing mode of this cover plate can also have wider contact surface range compared with fixing at both ends, so that the cover plate and the shell have better fixing effect.

[0007] Further, the fastener is connected at both ends of side edge, so that the stress between side edge and shell is uniform, and the fixing and installation effect between cover plate and shell is improved.

[0008] Furthermore, the fastener is a bolt, and a nut that engages with the bolt is fixedly provided on the housing. The cover plate is fixed by the engagement of the nut and the bolt, which is more reliable than the traditional bolt fixing method.

[0009] Furthermore, a slot is provided on the side of the housing, and a connecting hole is provided between the end face of the housing and the side edge of the cover plate corresponding to the slot. The connecting hole is used for the bolt shank to pass through, and the nut is inserted into the slot. The nut and the slot form a limiting fit that prevents the nut from rotating. During assembly, the nut is first inserted into the slot, and then the bolt is passed through the side edge and connected to the nut through the connecting hole. The structure is simple and the installation is convenient.

[0010] Furthermore, the connecting hole has an opening on the side of the housing, which facilitates the processing and forming of the connecting hole and also makes it easy to adjust the position of the bolt.

[0011] Furthermore, the side edge is provided with a U-shaped groove for bolt connection, which facilitates the connection between the bolt and the side edge.

[0012] Furthermore, a diagonal brace is provided between the upper part of the side edge and the main body of the cover plate. The diagonal brace can improve the reliability of the connection between the side edge and the main body of the cover plate and prevent the side edge from deforming, bending or breaking. The bolt is provided in the gap between two adjacent diagonal braces to strengthen the stress position of the side edge.

[0013] Furthermore, the cavity and the cover plate are provided with at least two sets of corresponding grooves. A groove is formed between the side edge of the adjacent cover plate and the inclined support block. The openings of the U-shaped grooves on the side edge of the adjacent cover plate are set in corresponding and close positions. A pressure plate is embedded in the groove. The two corresponding U-shaped grooves on the side edge of the adjacent cover plate are connected with a bolt. The bolt is also connected with the pressure plate. This design helps to reduce the number of bolts, simplify the assembly structure of the product, and improve the reliability of the connection between the cover plate and the housing.

[0014] The beneficial effects of this utility model are: the installation structure of the arc-extinguishing chamber cover plate of the circuit breaker of this utility model is not only compact, but also has good connection strength. The cover plate is not easy to loosen or fall off, and it helps to increase the space of the cavity, so that it can accommodate more arc-extinguishing grid plates, thereby improving the load-bearing and arc-extinguishing capacity of the circuit breaker. Attached Figure Description

[0015] Figure 1 A schematic diagram of the installation structure of the arc-extinguishing chamber cover plate of a conventional circuit breaker;

[0016] Figure 2 This is a structural diagram of an embodiment of the present utility model;

[0017] Figure 3A cross-sectional view of an embodiment of this utility model. Figure 1 ;

[0018] Figure 4 A cross-sectional view of an embodiment of this utility model. Figure 2 ;

[0019] Figure 5 This is a structural diagram of the cover plate according to an embodiment of the present utility model. Detailed Implementation

[0020] The installation structure of the circuit breaker arc-extinguishing chamber cover plate in this embodiment of the utility model is as follows: Figures 2-5 As shown, the circuit breaker includes a housing 2 with a cavity 20 for installing arc-extinguishing grid plates. A cover plate 3 is fixedly installed on the housing 2 to close in conjunction with the opening of the cavity 20. The cover plate 3 has multiple arc-extinguishing holes 30. The arrangement direction of the arc-extinguishing grid plates corresponds to the two ends of the cover plate 3. The cover plate 3 has side edges 31 on both sides, and the arrangement direction of the two side edges 31 is perpendicular to the two ends. The side edges 31 and the housing 2 are connected and fixed by fasteners, namely bolts 4. By fixing the cover plate 3 with the housing 2 of the circuit breaker through the cooperation of the two side edges 31, the space occupied in the cavity 20 along the arrangement direction of the arc-extinguishing grid plates is reduced, so that the cavity 20 can accommodate more arc-extinguishing grid plates. In addition, this fixing method of the cover plate 3 also has a wider contact area when fixing compared with fixing at both ends, so the fixing effect between the cover plate 3 and the housing 2 is also better.

[0021] The fasteners are connected to both ends of the side edge 31, which are the two ends corresponding to the two ends of the cover plate 3, so that the force between the side edge 31 and the housing 2 is even, thereby improving the fixed installation effect between the cover plate 3 and the housing 2.

[0022] The housing 2 is fixedly provided with a nut 5 that is connected to the bolt 4. The cover plate 3 is fixed by the cooperation of the nut 5 and the bolt 4. Compared with the traditional method of fixing the bolt and the housing directly, the fixing is more reliable.

[0023] The side of the housing 2 is provided with a slot 21. A connecting hole 22 is provided between the end face of the housing 2 and the side edge 31 of the cover plate 3 and the slot 21. The connecting hole 22 is used for the shank of the bolt 4 to pass through. The nut 5 is inserted into the slot 21. The nut 5 and the slot 21 form a limiting fit that prevents the nut 5 from rotating. Specifically, the slot 21 has two parallel side walls. The nut 5 is rectangular or hexagonal. The two side walls of the slot 21 restrict the rotation of the nut 5. In addition, the width of the connecting hole 22 is smaller than the width of the slot 21, so that the nut 5 will not enter the connecting hole 22 axially. During assembly, the nut 5 is first inserted into the slot 21, and then the bolt 4 is passed through the side edge 31 and then connected to the nut 5 through the connecting hole 22 to achieve locking and fixing between the cover plate 3 and the housing 2. The structure is simple and easy to install.

[0024] The connecting hole 22 has an opening on the side of the housing 2, which facilitates the processing and forming of the connecting hole 22, and also allows the bolt 4 to move laterally, making it easy to adjust the position of the bolt 4 and reducing the requirements for the tolerance fit accuracy between components.

[0025] The side edge 31 is provided with a U-shaped groove 311 for bolt 4 to be connected, which facilitates the connection between the bolt 4 and the side edge 31, allows the bolt 4 to be moved laterally in the U-shaped groove 311, makes it easy to adjust the position of the bolt 4, and reduces the requirements for the tolerance fit accuracy between components.

[0026] A diagonal brace 32 is provided between the upper part of the side edge 31 and the main body of the cover plate 3. The diagonal brace 32 can improve the reliability of the connection between the side edge 31 and the main body of the cover plate 3 and prevent the side edge 31 from deforming, bending or breaking. The bolt 4 is provided in the gap between two adjacent diagonal braces 32 to strengthen the stress position of the side edge 31.

[0027] In this embodiment, each of the two ends of the side edge 31 of each cover plate 3 is provided with a set of bolts 4 and U-shaped grooves 311. In other embodiments, more sets can be provided. These bolts 4 and U-shaped grooves 311 can be distributed along the length of the side edge 31.

[0028] In this embodiment, two sets of recesses 20 and cover plates 3 are provided. In other embodiments, there may be one or more sets. When there are at least two sets, a groove 6 is formed between the side edge 31 and the inclined support block 32 of the adjacent cover plates 3. The openings of the U-shaped grooves 311 of the side edge 31 of the adjacent cover plates are set in corresponding and close positions. A pressure plate 7 is embedded in the groove 6. The two corresponding U-shaped grooves 311 of the side edge 31 of the adjacent cover plates are connected with a bolt 4. The bolt 4 is also connected with the pressure plate 7. The pressure plate is pressed on the side edge 31 by the bolt 4. This design allows one bolt 4 to be used for the fixed installation of two adjacent cover plates 3 at the same time, which helps to reduce the number of bolts, simplify the assembly structure of the product, and improve the reliability of the connection between the cover plate 3 and the housing 2.

[0029] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. An installation structure for a circuit breaker arc-extinguishing chamber cover plate, comprising a housing, a cavity for installing arc-extinguishing grid plates on the housing, a cover plate fixedly installed on the housing to close in conjunction with the opening of the cavity, the cover plate having a plurality of arc-venting holes, the arc-extinguishing grid plates being arranged in a direction corresponding to the two ends of the cover plate, characterized in that: The cover plate has side edges on both sides, and the side edges and the housing are connected and fixed by fasteners.

2. The installation structure of the circuit breaker arc-extinguishing chamber cover plate according to claim 1, characterized in that: The fasteners are connected to both ends of the side edge.

3. The installation structure of the circuit breaker arc-extinguishing chamber cover plate according to claim 2, characterized in that: The fastener is a bolt, and a nut that mates with the bolt is fixedly installed on the housing.

4. The installation structure of the circuit breaker arc-extinguishing chamber cover plate according to claim 3, characterized in that: The side of the housing is provided with a slot, and a connecting hole is provided between the end face of the housing and the side edge of the cover plate corresponding to the slot. The connecting hole is used for the bolt shank to pass through, and the nut is inserted into the slot. The nut and the slot form a limiting fit that prevents the nut from rotating.

5. The installation structure of the circuit breaker arc-extinguishing chamber cover plate according to claim 4, characterized in that: The connection hole has an opening on the side of the housing.

6. The installation structure of the circuit breaker arc-extinguishing chamber cover plate according to claim 3, characterized in that: The side edge is provided with a U-shaped groove for bolt connection.

7. The installation structure of the circuit breaker arc-extinguishing chamber cover plate according to claim 6, characterized in that: A diagonal brace is provided between the upper part of the side edge and the main body of the cover plate, and the bolt is provided in the gap between two adjacent diagonal braces.

8. The installation structure of the circuit breaker arc-extinguishing chamber cover plate according to claim 7, characterized in that: The cavity and cover plate are provided with at least two sets of corresponding arrangements. A groove is formed between the side edge of the adjacent cover plate and the inclined support block. The opening of the U-shaped groove on the side edge of the adjacent cover plate is set at the corresponding and close position. A pressure plate is embedded in the groove. The two corresponding U-shaped grooves on the side edge of the adjacent cover plate are connected with a bolt. The bolt is also connected with the pressure plate.

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