Arc extinguish chamber structure, circuit breaker and residual-current circuit breaker

Abstract

The utility model relates to an arc extinguish chamber structure, a circuit breaker and a residual-current circuit breaker, the arc extinguish chamber structure comprises an arc extinguish chamber shell, an arc extinguish cover connected with the arc extinguish chamber shell and a plurality of arc extinguish grid sheets arranged in the arc extinguish cover at equal intervals, the arc extinguish cover is arranged in a U shape and forms an arc extinguish cavity, and the plurality of arc extinguish grid sheets are arranged in the arc extinguish cavity; a plurality of first arc-extinguishing openings are formed in one side of the arc-extinguishing cover, a plurality of second arc-extinguishing openings are formed in the other side of the arc-extinguishing cover, the first arc-extinguishing openings and the second arc-extinguishing openings are arranged in a staggered manner, and an arc-extinguishing cavity space between two adjacent arc-extinguishing grid plates is communicated with the first arc-extinguishing openings or the second arc-extinguishing openings; an arc guide opening which is gradually shrunk from a groove opening to a groove bottom is formed in one side, facing the opening of the arc extinguishing cavity, of the arc extinguishing grid sheet; and the arc guide opening is formed by sequentially connecting a bevel edge, an arc groove, a horizontal edge and a chamfer edge. According to the invention, the arc can enter the arc extinguishing chamber easily, the arc can be lengthened and cut to the maximum extent in a limited space, and the purpose of rapid arc extinguishing is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to an arc extinguishing chamber structure, a circuit breaker, and a leakage circuit breaker. Background Art

[0002] A circuit breaker is a mechanical switch that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry for a certain time and disconnect current under specified abnormal circuit conditions. It is suitable for overload and short-circuit protection of lines, and can also be used for infrequent operation conversion of lines under normal circumstances. It is mainly used in various places such as industry, commerce, high-rise buildings and residential buildings.

[0003] When the circuit breaker disconnects the circuit, an arc will be drawn between the moving contact and the stationary contact. Not only will the arc itself damage the moving contact and the stationary contact, but it will also produce harmful substances such as dust, metal particles and high-temperature air, which will not only damage the moving contact and the stationary contact, but also damage other mechanisms inside the circuit breaker. Therefore, the circuit breaker is usually equipped with an arc extinguishing chamber to extinguish the arc drawn between the moving contact and the stationary contact.

[0004] At present, the structure of the arc extinguishing chamber mainly includes a pair of arc-isolating walls and a group of arc-extinguishing grids, wherein the arc-extinguishing grids are mostly composed of a group of parallel iron sheets; the arc-extinguishing grids can cut and quickly extinguish the arc, but their shape has a great influence on the performance of the arc extinguishing chamber. Utility Model Content

[0005] The present application provides an arc extinguishing chamber structure, a circuit breaker, and a leakage circuit breaker, which are conducive to the arc entering the arc extinguishing chamber, and can stretch and cut the arc to the maximum extent in a limited space, thereby achieving the purpose of rapid arc extinguishing.

[0006] The arc extinguishing chamber structure provided in this application adopts the following technical solution:

[0007] An arc extinguishing chamber structure comprises an arc extinguishing chamber shell, an arc extinguishing hood connected to the arc extinguishing chamber shell, and a plurality of arc extinguishing grids arranged in the arc extinguishing hood at equal intervals, the arc extinguishing hood is arranged in a U-shape and forms an arc extinguishing cavity, and a plurality of arc extinguishing grids are arranged in the arc extinguishing cavity; a plurality of first arc extinguishing openings are opened on one side of the arc extinguishing hood, and a plurality of second arc extinguishing openings are opened on the other side, the first arc extinguishing openings and the second arc extinguishing openings are arranged in a staggered manner, and the arc extinguishing cavity space between two adjacent arc extinguishing grids is arranged in communication with the first arc extinguishing opening or the second arc extinguishing opening; an arc guide opening which gradually shrinks from a slot opening to a slot bottom is opened on the opening side of the arc extinguishing grid facing the arc extinguishing cavity, and the arc guide opening is formed by connecting a bevel edge, a circular arc slot, a horizontal edge, and a chamfered edge in sequence.

[0008] Preferably, the chamfered edge protrudes from the hypotenuse.

[0009] Preferably, a mounting hole is opened on the side wall of the arc extinguishing cover, and a protrusion is arranged on the side edge of the arc extinguishing grid, and the protrusion is clamped in the mounting hole.

[0010] Preferably, a plurality of the protrusions are symmetrically arranged on both sides of the arc-extinguishing grid, and the mounting holes are arranged one-to-one corresponding to the protrusions.

[0011] Preferably, a plurality of slots are equidistantly provided on the arc extinguishing chamber housing, and first clamping feet are provided on the outer edge of the arc extinguishing grid on one side facing the bevel, and the first clamping feet are respectively clamped and installed on the slots.

[0012] Preferably, a mounting groove is formed between the first clamping foot and a side wall of the arc extinguishing cover, a clamping strip is provided on the arc extinguishing chamber shell, the clamping strip is limitedly installed in the mounting groove, and the clamping groove is located on one side of the clamping strip.

[0013] Preferably, a second clamping foot is provided on the outer edge of the arc-extinguishing grid piece on one side facing the chamfered edge, and the second clamping foot is clamped and installed on the other side wall of the arc-extinguishing cover.

[0014] Preferably, an air flow channel is formed between a side wall of the arc extinguishing cover and the arc extinguishing chamber shell.

[0015] The present application provides a circuit breaker and a leakage circuit breaker adopting the following technical solution:

[0016] A circuit breaker and a leakage circuit breaker include a body, a handle installed on the body and a moving contact operating mechanism installed in the body. The above-mentioned arc extinguishing chamber structure is characterized in that the handle is movably connected to a connecting rod, and the other end of the connecting rod is connected to the moving contact operating mechanism. The handle rotates and drives the moving contact operating mechanism to realize the connection or disconnection of the circuit breaker / leakage circuit breaker.

[0017] In summary, the present application includes at least one of the following beneficial technical effects:

[0018] An arc guide opening is provided on the opening side of the arc extinguishing grid facing the arc extinguishing chamber, which gradually shrinks from the notch to the bottom of the slot. The arc guide opening is connected in sequence by a bevel, a circular arc slot, a horizontal edge, and a chamfered edge. The arc guide opening of this shape and structure is conducive to the arc entering the arc extinguishing chamber. At the same time, it has a better effect of lengthening and cutting the arc entering the arc extinguishing grid, and divides the arc into several short arcs during movement. Multiple arc guide openings are used to increase the contact between the short arc after cutting and lengthening and the external air; the first arc extinguishing opening and the second arc extinguishing opening are combined to form a double-sided air jet, which can lengthen the arc to the maximum extent within a limited space, and can have a better arc extinguishing effect on AC and DC circuits, so as to improve the breaking capacity of the circuit breaker. At the same time, it also plays a role in reducing the volume of the arc extinguishing chamber structure, thereby reducing the overall volume of the circuit breaker / leakage circuit breaker;

[0019] By opening mounting holes on both side walls of the arc extinguishing hood, and arranging protrusions on both side edges of the arc extinguishing grid, the protrusions are clamped in the mounting holes to achieve fixed installation between the arc extinguishing grid and the arc extinguishing hood;

[0020] A plurality of slots are equidistantly provided on the arc extinguishing chamber shell, a first clamping foot is provided on the outer side of the arc extinguishing grid facing the beveled edge, the first clamping feet of the plurality of arc extinguishing grids are respectively clamped and installed on the slots, a second clamping foot is provided on the outer side of the arc extinguishing grid facing the chamfered edge, the second clamping foot is clamped and installed on the other side wall of the arc extinguishing hood, so as to achieve installation stability between the arc extinguishing grid and the arc extinguishing hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the arc extinguishing chamber structure;

[0022] Figure 2 It is a schematic diagram of the partial structure of the arc extinguishing chamber;

[0023] Figure 3 It is a schematic diagram of the structure of the arc extinguishing hood and the arc extinguishing grid;

[0024] Figure 4 It is a side view of the arc extinguishing chamber housing, arc extinguishing cover and arc extinguishing grid;

[0025] Figure 5 It is a schematic diagram of the structure of the arc extinguishing grid;

[0026] Figure 6 It is a schematic diagram of the structure of the circuit breaker / leakage circuit breaker with one side of the shell removed.

[0027] Explanation of the reference numerals in the accompanying drawings: 1. Arc extinguishing chamber shell; 11. Card slot; 12. Mounting slot; 13. Card strip; 2. Arc extinguishing cover; 21. Arc extinguishing cavity; 22. First arc extinguishing opening; 23. Second arc extinguishing opening; 24. Mounting hole; 3. Arc extinguishing grid; 31. Bump; 32. First card foot; 33. Second card foot; 34. Arc guide opening; 341. Bevel edge; 342. Arc groove; 343. Horizontal edge; 344. Chamfered edge; 4. Air flow channel; 5. Main body; 6. Handle; 7. Moving contact operating mechanism; 8. Arc extinguishing chamber structure; 9. Connecting rod. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with the accompanying drawings. Example

[0029] An embodiment of the present application discloses an arc extinguishing chamber structure.

[0030] Reference Figures 1 to 3The arc extinguishing chamber structure includes an arc extinguishing chamber shell 1, an arc extinguishing hood 2 connected to the arc extinguishing chamber shell 1, and a plurality of arc extinguishing grids 3 arranged at equal intervals in the arc extinguishing hood 2; the arc extinguishing hood 2 is arranged in a U shape and forms an arc extinguishing cavity 21, and a plurality of arc extinguishing grids 3 are arranged in the arc extinguishing cavity 21.

[0031] Reference Figures 1 to 4 , wherein a plurality of first arc extinguishing openings 22 are opened on one side of the arc extinguishing cover 2, and a plurality of second arc extinguishing openings 23 are opened on the other side thereof, and the first arc extinguishing openings 22 and the second arc extinguishing openings 23 are staggered, and the arc extinguishing cavity 21 space between two adjacent arc extinguishing grids 3 is communicated with the first arc extinguishing openings 22 or the second arc extinguishing openings 23.

[0032] Mounting holes 24 are provided on both side walls of the arc extinguishing hood 2, and protrusions 31 are provided on both side edges of the arc extinguishing grid 3; a plurality of protrusions 31 are symmetrically arranged on both sides of the arc extinguishing grid 3, and the mounting holes 24 are arranged one by one corresponding to the protrusions 31, and the arc extinguishing grid 3 and the arc extinguishing hood 2 are fixedly installed by clamping the protrusions 31 in the mounting holes 24.

[0033] Reference Figures 1 to 5 Furthermore, a plurality of slots 11 are equidistantly provided on the arc extinguishing chamber housing 1, and a first clamping foot 32 is provided on the outer edge of the arc extinguishing grid 3 on the side facing the oblique edge 341, and the first clamping feet 32 ​​of the plurality of arc extinguishing grids 3 are respectively clamped and installed on the slots 11; an installation slot 12 is formed between the first clamping foot 32 and a side wall of the arc extinguishing cover 2, and a clamping strip 13 is provided on the arc extinguishing chamber housing 1, and the clamping strip 13 is limitedly installed in the installation slot 12, and the slot 11 is located on one side of the clamping strip 13 and connects the plurality of slots 11 in sequence.

[0034] At the same time, a second clamping foot 33 is provided on the outer edge of the arc extinguishing grid 3 facing the chamfered edge 344, and the second clamping foot 33 is clamped and installed on the other side wall of the arc extinguishing cover 2 to achieve installation stability between the arc extinguishing grid 3 and the arc extinguishing cover 2.

[0035] An arc guide opening 34 which gradually contracts from the slot opening to the slot bottom is provided on the opening side of the arc extinguishing grid 3 facing the arc extinguishing chamber 21, and a plurality of arc guide openings 34 are coaxially arranged; the arc guide opening 34 is formed by connecting a bevel 341, an arc slot 342, a horizontal edge 343, and a chamfered edge 344 in sequence, and the chamfered edge 344 is arranged to protrude from the bevel 341; the arc guide opening 34 of this shape and structure is provided, which is conducive to the arc entering the arc extinguishing chamber, and at the same time has a better effect of lengthening and cutting the arc entering the arc extinguishing grid 3, and divides the arc into a plurality of short arcs during movement, and utilizes a plurality of arc guide openings 34 to increase the contact between the short arc after cutting and lengthening and the external air.

[0036] An airflow channel 4 is arranged between one side wall of the arc extinguishing cover 2 and the arc extinguishing chamber housing 1, and the first arc extinguishing opening 22 and the second arc extinguishing opening 23 form double-sided air injection, which can maximize the arc extension in a limited space, and can have a good arc extinguishing effect on AC and DC circuits to improve the breaking capacity of the circuit breaker. At the same time, it also plays a role in reducing the volume of the arc extinguishing chamber structure, thereby reducing the overall volume of the circuit breaker / leakage circuit breaker. Example

[0037] The embodiments of the present application disclose a circuit breaker and a leakage circuit breaker.

[0038] Reference Figure 6 The circuit breaker and the leakage circuit breaker include a body 5, a handle 6 installed on the body 5, a moving contact operating mechanism 7 installed in the body 5, and the arc extinguishing chamber structure 8 in Example 1; the handle 6 is movably connected to a connecting rod 9, the other end of the connecting rod 9 is connected to the moving contact operating mechanism 7, the handle 6 rotates and drives the moving contact operating mechanism 7 to realize the connection or disconnection of the circuit breaker / leakage circuit breaker.

[0039] The implementation principle is: through the arc extinguishing chamber structure 8 in Example 1, the arc extinguishing grid 3 cooperates with the arc extinguishing cover 2 and the arc extinguishing chamber shell 1 to maximize the length of the arc in a limited space, which can have a better arc extinguishing effect on AC and DC circuits. At the same time, the cavity volume of the arc extinguishing chamber is increased under the premise of achieving a better arc extinguishing effect, and the pressure of the arc entering the arc extinguishing chamber is reduced. When the circuit breaker / leakage circuit breaker equipped with the arc extinguishing chamber structure 8 interrupts the short-circuit current, the short-circuit breaking capacity is improved and the contacts are effectively protected.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An arc extinguishing chamber structure, comprising an arc extinguishing chamber housing (1), an arc extinguishing hood (2) connected to the arc extinguishing chamber housing (1), and a plurality of arc extinguishing grids (3) arranged in the arc extinguishing hood (2) at equal intervals, characterized in that: The arc extinguishing hood (2) is arranged in a U-shape and forms an arc extinguishing cavity (21), and a plurality of arc extinguishing grids (3) are arranged in the arc extinguishing cavity (21); a plurality of first arc extinguishing openings (22) are opened on one side of the arc extinguishing hood (2), and a plurality of second arc extinguishing openings (23) are opened on the other side; the first arc extinguishing openings (22) and the second arc extinguishing openings (23) are arranged in a staggered manner, and the arc extinguishing cavity (21) space between two adjacent arc extinguishing grids (3) is arranged in communication with the first arc extinguishing opening (22) or the second arc extinguishing opening (23); an arc guide opening (34) which gradually contracts from a slot opening to a slot bottom is opened on an opening side of the arc extinguishing grid (3) facing the arc extinguishing cavity (21), and the arc guide opening (34) is formed by sequentially connecting a bevel edge (341), a circular arc slot (342), a horizontal edge (343), and a chamfered edge (344).

2. The arc extinguishing chamber structure according to claim 1, characterized in that: The chamfered edge (344) is arranged to protrude from the oblique edge (341).

3. The arc extinguishing chamber structure according to claim 1, characterized in that: A mounting hole (24) is provided on the side wall of the arc extinguishing cover (2), and a protrusion (31) is provided on the side edge of each arc extinguishing grid (3), wherein the protrusion (31) is clamped in the mounting hole (24).

4. The arc extinguishing chamber structure according to claim 3, characterized in that: The plurality of protrusions (31) are symmetrically arranged on both sides of the arc-extinguishing grid (3), and the mounting holes (24) are arranged one by one corresponding to the protrusions (31).

5. The arc extinguishing chamber structure according to claim 1, characterized in that: A plurality of slots (11) are equidistantly provided on the arc extinguishing chamber housing (1), and first clamping feet (32) are provided on the outer side of the arc extinguishing grid (3) facing the oblique edge (341), wherein the first clamping feet (32) are respectively clamped and mounted on the slots (11).

6. The arc extinguishing chamber structure according to claim 5, characterized in that: A mounting groove (12) is formed between the first clamping foot (32) and a side wall of the arc extinguishing cover (2); a clamping strip (13) is provided on the arc extinguishing chamber housing (1); the clamping strip (13) is positionally mounted in the mounting groove (12); and the clamping groove (11) is located on one side of the clamping strip (13).

7. The arc extinguishing chamber structure according to claim 1 or 5, characterized in that: A second clamping foot (33) is provided on the outer edge of the arc extinguishing grid (3) on one side facing the chamfered edge (344), and the second clamping foot (33) is clamped and installed on the other side wall of the arc extinguishing cover (2).

8. The arc extinguishing chamber structure according to claim 1, characterized in that: An air flow channel (4) is formed between a side wall of the arc extinguishing hood (2) and the arc extinguishing chamber housing (1).

9. A circuit breaker or a leakage circuit breaker, comprising a body (5), a handle (6) mounted on the body (5), and a moving contact operating mechanism (7) mounted in the body (5), characterized in that: It also includes the arc extinguishing chamber structure (8) described in any one of items 1 to 8, wherein the handle (6) is movably connected to a connecting rod (9), the other end of the connecting rod (9) is connected to a moving contact operating mechanism (7), and the handle (6) rotates and drives the moving contact operating mechanism (7) to operate so as to realize the connection or disconnection of the circuit breaker / leakage circuit breaker.

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