Arc extinguishing chamber of circuit breaker

Abstract

An arc extinguishing cover of a circuit breaker comprises a plurality of arc extinguishing grid sheets which are arranged at intervals, side arc extinguishing openings are arranged on the arc extinguishing grid sheets, slots which are symmetrically distributed on two sides are arranged on the upper end surfaces and the lower end surfaces of the arc extinguishing grid sheets, clamping plates which are used for being connected with the plurality of arc extinguishing grid sheets at the same time are inserted into the slots, and assembling bulges are arranged in the middle positions of the slots. A plurality of assembly openings which are matched with the arc extinguishing grid plates in number and are arranged at intervals are formed in the clamping plate, and the assembly openings are in clearance fit with the assembly bulges to determine the final position of each arc extinguishing grid plate on the clamping plate; and the assembly bulges of the arc extinguishing grid sheets at the foremost end, the rearmost end and the middle position are provided with anti-falling blocks which can rotate and are used for preventing the clamping plates from being separated from the arc extinguishing grid sheets. The beneficial effects of the utility model lie in that the clamping plate and the arc chute sheet are in clearance fit, so that the assembling or disassembling efficiency can be improved, and the clamping plate and the arc chute sheet are prevented from being separated after being assembled through the anti-falling block.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to an arc extinguishing cover of a circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry, and interrupt the current under normal circuit conditions and can close, carry, and interrupt the current under abnormal circuit conditions within a specified time. It generally consists of a contact system, an arc extinguishing system, an operating mechanism, a release, a housing, etc. When a short circuit occurs, the magnetic field generated by a large current, generally 10 to 12 times, overcomes the counterforce spring, and the release pulls the operating mechanism to act, and the switch trips instantaneously; when overloaded, the current increases, the heat generation intensifies, and the bimetallic strip deforms to a certain extent to push the mechanism to act. The greater the current, the shorter the action time.

[0003] Publication (Announcement) Number: CN220272409U discloses a mini circuit breaker arc extinguishing cover, including an arc extinguishing cover and arc extinguishing grid sheets. The arc extinguishing cover is composed of several arc extinguishing grid sheets, and the arc extinguishing grid sheets are arranged in a row. A plurality of fixing positions are provided at the front and rear end faces of the arc extinguishing grid sheets. A fixing block is fixedly connected to the fixing positions. A fixing plate is arranged on the fixing positions. A plurality of fixing holes are provided on the fixing plate. A plurality of creepage grooves are fixedly connected to one side surface of the arc extinguishing grid sheet. This arc extinguishing cover realizes the connection with several arc extinguishing grid sheets through the setting of the fixing plate, that is, through the fixing holes and the fixing blocks, and then uses the clamping blocks arranged on the fixing blocks to prevent the fixing plate and the arc extinguishing grid sheets from coming off after connection. However, there are defects, which are mainly reflected in the fixing blocks provided with clamping blocks. The setting of the clamping blocks results in the overall size of the fixing block being larger than the size of the fixing hole, so that the fixing block is not smooth when inserted into the fixing hole, and a force needs to be applied and passed through in a squeezing manner. Considering that there is more than one arc extinguishing grid sheet and more than one fixing plate, a large amount of time is required for assembly or maintenance and disassembly. Content of the Utility Model

[0004] The utility model aims to solve the above-mentioned disadvantages of the prior art and provides an arc extinguishing cover of a circuit breaker to solve the above problems.

[0005] The technical solution adopted by the present utility model to solve its technical problems: The arc extinguishing cover of this circuit breaker includes a plurality of arc extinguishing grid plates arranged at intervals. Side arc extinguishing openings are provided on the arc extinguishing grid plates. Slots symmetrically distributed on both sides are provided on the upper and lower end faces of the arc extinguishing grid plates. A clamping plate for connecting with multiple arc extinguishing grid plates simultaneously is inserted into the slots. An assembly protrusion is provided at the center position of the slots. A plurality of assembly openings matching the number of arc extinguishing grid plates and arranged at intervals are formed on the clamping plate. The assembly openings and the assembly protrusions are in clearance fit to determine the final position of each arc extinguishing grid plate on the clamping plate. Anti-disengagement blocks that can rotate and are used to prevent the clamping plate from separating from the arc extinguishing grid plates are provided on the assembly protrusions of the arc extinguishing grid plates at the frontmost, rearmost, and middle positions.

[0006] For further improvement, the shapes and sizes of the assembly protrusion and the anti-disengagement block are matched, and both are in a rectangular configuration.

[0007] For further improvement, the height of the assembly protrusions of the arc extinguishing grid plates at the frontmost, rearmost, and middle positions is half of the height of the assembly protrusions of the arc extinguishing grid plates at other positions, and the height of the anti-disengagement block is half of the height of the assembly protrusions of the arc extinguishing grid plates at other positions.

[0008] For further improvement, a shaft member extending upward is provided on the assembly protrusion for setting the anti-disengagement block, and the anti-disengagement block rotates with the shaft member as the rotation axis.

[0009] For further improvement, a rotation stopping hole is formed on the side surface of the anti-disengagement block, and a rotation stopping structure that is inserted into the rotation stopping hole after the anti-disengagement block rotates in the locking direction is provided at the position of the clamping plate on one side of the anti-disengagement block.

[0010] For further improvement, the rotation stopping structure includes a positioning seat, a rotation stopping rod, and a spring. The positioning seat is provided on the clamping plate. The rotation stopping rod is movably arranged in the positioning seat and is coaxially arranged with the rotation stopping hole, and a stopping block is provided at the end far from the anti-disengagement block. The spring is sleeved on the rotation stopping rod and one end is fixed on the positioning seat and the other end is fixed on the stopping block.

[0011] For further improvement, the upper end surfaces of the positioning seat and the anti-disengagement block are at the same level.

[0012] The beneficial effects of the present utility model are:

[0013] The clamping plate and the arc extinguishing grid plates of the present utility model are in clearance fit, which can improve the assembly or disassembly efficiency, and the anti-disengagement blocks prevent the clamping plate and the arc extinguishing grid plates from separating after assembly. Moreover, the anti-disengagement blocks are only provided on the assembly protrusions of the arc extinguishing grid plates at the frontmost, rearmost, and middle positions, realizing three-point constraints to ensure the cooperation degree between the clamping plate and the arc extinguishing grid plates. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present utility model;

[0015] Figure 2 This is a schematic cross-sectional view of the arc extinguishing grid plates of the present utility model;

[0016] Figure 3 For the present utility model Figure 2 A partial enlarged schematic view of part A in it;

[0017] Figure 4 This is a partial enlarged schematic view of the clamping plate of the present utility model, used to show the anti-disengagement block and the anti-rotation structure. Specific embodiments

[0018] The present utility model will be further described below in conjunction with the accompanying drawings:

[0019] Referring to the accompanying drawings: The arc extinguishing cover of this circuit breaker includes a plurality of arc extinguishing grid plates 1 arranged at intervals. Side arc extinguishing openings 11 are provided on the arc extinguishing grid plates 1. Slots 12 symmetrically distributed on both sides are provided on the upper and lower end faces of the arc extinguishing grid plates 1. A clamping plate 2 used to connect with a plurality of arc extinguishing grid plates 1 simultaneously is inserted into the slots 12. An assembly protrusion 3 is provided at the center position of the slots 12. A plurality of assembly openings 4 matching the number of the arc extinguishing grid plates 1 and arranged at intervals are formed on the clamping plate 2. The assembly openings 4 are in clearance fit with the assembly protrusion 3 to determine the final position of each arc extinguishing grid plate 1 on the clamping plate 2. Anti-disengagement blocks 5 that can rotate and are used to prevent the clamping plate 2 from separating from the arc extinguishing grid plates 1 are provided on the assembly protrusions 3 of the arc extinguishing grid plates 1 at the frontmost, rearmost, and middle positions. The principle of the present utility model is that first, the clamping plate 2 assembled with the arc extinguishing grid plates 1 can be buried inside by using the slots 12, so that when the arc extinguishing cover is arranged in the housing of the circuit breaker, it will not interfere with the contact between the arc extinguishing grid plates 1 and the inner wall of the housing. Then, the combination of the assembly protrusion 3 and the assembly openings 4 is used to clarify the position of the arc extinguishing grid plates 1 on the clamping plate 2 to ensure that the interval distance between each arc extinguishing grid plate 1 is consistent. And the assembly protrusion 3 and the assembly openings 4 are in clearance fit (that is, the sizes of the assembly protrusion 3 and the assembly openings 4 are adapted, and when inserting, it is not necessary to squeeze through as in the prior art), so that the assembly protrusion 3 can be quickly inserted into the assembly openings 4, reducing the assembly difficulty and improving the assembly or disassembly efficiency. The anti-disengagement blocks 5 are used to prevent the clamping plate 2 and the arc extinguishing grid plates 1 from separating after assembly, and the operation is convenient, that is, it can be realized by rotation. Moreover, the anti-disengagement blocks 5 are only provided on the assembly protrusions 3 of the arc extinguishing grid plates 1 at the frontmost, rearmost, and middle positions, realizing three-point constraint to ensure the matching degree between the clamping plate 2 and the arc extinguishing grid plates 1.

[0020] The shapes and sizes of the assembly protrusion 3 and the anti-disengagement block 5 match, and both are rectangular configurations. Such a setting enables the anti-disengagement block 5 to pass quickly. Since the assembly openings 4 are rectangular configurations, that is, their length and width dimensions are different, the anti-disengagement block 5 can present a cross shape with the assembly openings 4 after rotation, that is, anti-disengagement is realized by the dislocation of the two.

[0021] The height of the assembly protrusion 3 of the arc extinguishing grid piece 1 at the frontmost, rearmost, and central positions is half of the height of the assembly protrusion 3 of the arc extinguishing grid piece 1 at other positions. The height of the anti-disengagement block 5 is half of the height of the assembly protrusion 3 of the arc extinguishing grid piece 1 at other positions. Such a setting makes the overall height of the two with the assembly protrusion 3 having the anti-disengagement block 5 the same as the height of the assembly protrusion 3 at other positions. When the arc extinguishing cover is arranged in the shell, the anti-disengagement block 5 can also contact the inner wall of the shell.

[0022] An axial member 6 extending upward is provided on the assembly protrusion 3 for setting the anti-disengagement block 5. The anti-disengagement block 5 rotates with the axial member 6 as the rotation axis. Such a setting can realize the rotation of the anti-disengagement block 5. There is a counterbore 52 in the anti-disengagement block 5. The counterbore 52 has a small-diameter hole section adapted to the outer diameter of the axial member 6 and a large-diameter hole section for setting the bolt 52-a. The bolt 52-a is used to connect with the axial member 6 (the upper end of the axial member 6 has an internal threaded hole). In this way, while realizing the rotation of the anti-disengagement block 5, it can also prevent it from detaching from the axial member 6. Moreover, the depth of the bolt 52-a in the internal threaded hole can limit the smoothness of the anti-disengagement block 5 during rotation, that is, prevent the rotating block 5 from freely rotating, which requires manual force to achieve.

[0023] A rotation stop hole 51 is formed on the side surface of the anti-disengagement block 5. The clamping plate 2 is provided with a rotation stop structure 7 at a position on one side of the anti-disengagement block 5, which is inserted into the rotation stop hole 51 after the anti-disengagement block 5 rotates along the locking direction. Such a setting is used to prevent the anti-disengagement block 5 from returning to the unlocking position after the locking rotation occurs, that is, the rotation stop structure 7 is on the rotation track of the anti-disengagement block 5 when acting on the rotation stop hole 51, so as to achieve the rotation stop effect.

[0024] The rotation stop structure 7 includes a positioning seat 71, a rotation stop rod 72, and a spring 73. The positioning seat 71 is arranged on the clamping plate 2. The rotation stop rod 72 is movably arranged in the positioning seat 71 and is coaxially arranged with the rotation stop hole 51. And a stop block 72-a is arranged at one end far from the anti-disengagement block 5. The spring 73 is sleeved on the rotation stop rod 72, with one end fixed on the positioning seat 71 and the other end fixed on the stop block 72-a. Such a setting can not only make the rotation stop rod 72 located at a position coaxial with the rotation stop hole 51, but also realize the movement of the rotation stop rod 72. The spring 73 makes the rotation stop rod 72 have self-resetting property after moving in the unlocking direction, that is, makes the rotation stop rod 72 always stay in the rotation stop hole 51 when locking the anti-disengagement block 5, and can also limit the free movement of the rotation stop rod 72. The stop block 72-a is used to limit the spring 73 on the rotation stop rod 72, so as to provide a self-resetting effect for the rotation stop rod 72.

[0025] The upper end surface of the positioning seat 71 and the upper end surface of the anti-disengagement block 5 are at the same level. Such a setting makes the positioning seat 71 not interfere with the contact between the arc extinguishing grid piece 1 and the inner wall of the shell.

[0026] Although the present utility model has been illustrated and described by referring to the preferred embodiments, those of ordinary skill in the art should understand that various changes in form and details may be made within the scope of the claims.

Claims

1. An arc extinguishing hood of a circuit breaker, comprising a plurality of arc extinguishing grids (1) arranged at intervals, wherein the arc extinguishing grids (1) are provided with side arc extinguishing openings (11), characterized in that: The upper and lower end surfaces of the arc-extinguishing grid (1) are provided with slots (12) symmetrically distributed on both sides, the slots (12) are inserted with clamps (2) for connecting with a plurality of the arc-extinguishing grids (1) at the same time, an assembly protrusion (3) is provided at the center of the slots (12), the clamps (2) are formed with a plurality of assembly openings (4) matching the number of the arc-extinguishing grids (1) and arranged at intervals, the assembly openings (4) and the assembly protrusions (3) are clearance-matched to determine the final position of each arc-extinguishing grid (1) on the clamps (2), and anti-slip blocks (5) which are rotatable and used to prevent the clamps (2) from separating from the arc-extinguishing grid (1) are provided on the assembly protrusions (3) of the arc-extinguishing grids (1) at the front end, the rear end, and the middle.

2. The arc extinguishing hood of the circuit breaker according to claim 1, characterized in that: The shape and size of the assembly protrusion (3) and the anti-slip block (5) match each other, and both are rectangular in configuration.

3. The arc extinguishing hood of the circuit breaker according to claim 2, characterized in that: The height of the assembly protrusions (3) of the arc-extinguishing grids (1) located at the front end, the rear end, and the center is half the height of the assembly protrusions (3) of the arc-extinguishing grids (1) at other positions, and the height of the anti-dropping block (5) is half the height of the assembly protrusions (3) of the arc-extinguishing grids (1) at other positions.

4. The arc extinguishing hood of the circuit breaker according to claim 3, characterized in that: The assembly protrusion (3) for arranging the anti-slip block (5) is provided with a shaft (6) extending upward, and the anti-slip block (5) rotates with the shaft (6) as a rotation axis.

5. The arc extinguishing hood of the circuit breaker according to claim 4, characterized in that: A rotation-stopping hole (51) is formed on the side of the anti-slip block (5), and a rotation-stopping structure (7) is provided on the clamping plate (2) at a position located on one side of the anti-slip block (5) and is inserted into the rotation-stopping hole (51) after the anti-slip block (5) rotates in the locking direction.

6. The arc extinguishing hood of the circuit breaker according to claim 5, characterized in that: The anti-rotation structure (7) comprises a positioning seat (71), an anti-rotation rod (72), and a spring (73); the positioning seat (71) is arranged on the clamping plate (2); the anti-rotation rod (72) is movably arranged on the positioning seat (71) and is coaxially arranged with the anti-rotation hole (51); and a stop block (72-a) is arranged at one end away from the anti-slip block (5); the spring (73) is sleeved on the anti-rotation rod (72) and one end is fixed to the positioning seat (71) and the other end is fixed to the stop block (72-a).

7. The arc extinguishing hood of the circuit breaker according to claim 6, characterized in that: The upper end surface of the positioning seat (71) and the upper end surface of the anti-fall-off block (5) are maintained at the same level.

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