Arc extinguish chamber structure of circuit breaker

Abstract

The utility model relates to an arc extinguish chamber structure of a circuit breaker, which comprises an arc extinguish grid plate assembly, a supporting piece and supporting pieces, the arc extinguish grid plate assembly is inserted in the supporting piece, and the supporting pieces are arranged on two sides of the arc extinguish grid plate assembly; the arc extinguishing grid sheet assemblies are arranged in a fan shape; in the arc extinguishing grid sheet assembly, the tail part of the arc extinguishing grid sheet on at least one side of the fan-shaped arrangement is provided with a bend. Compared with the prior art, the arc extinguishing grid sheets at one side of the arc extinguishing grid sheet group are bent on the basis of fan-shaped arrangement, so that the technical problems that adjacent grid sheets interfere with each other and the length of the tail parts of the grid sheets is limited due to fan-shaped arrangement are solved; a relatively long grid plate tail part is arranged, and meanwhile, more arc extinguishing grid plates can be accommodated in the arc extinguishing chamber with a limited space, so that the arc striking capability can be improved; and the arc extinguishing grid sheets which are arranged in a bending manner have different bending angles, so that the air gap space is increased, and the arc extinguishing capability is enhanced.

Description

Technical Field

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

[0002] For the breaking capacity of the circuit breaker, the arc extinguishing chamber plays a vital role.

[0003] The existing arc extinguishing chamber adopts arc extinguishing grids stacked in several layers. The arc extinguishing grid includes two supporting legs and a flame extinguishing portion connecting the two supporting legs. The two supporting legs and the flame extinguishing portion form an arc extinguishing groove. When the circuit breaker is disconnected, the arc pulled apart by the moving and static contacts is gradually elongated through the arc extinguishing groove, thereby extinguishing the arc. Although this type of arc extinguishing chamber has a certain arc extinguishing ability, its arc extinguishing performance is still not ideal. Especially when the size of the arc extinguishing chamber is small, the arc extinguishing grid will be limited in design, thereby affecting the arc striking ability and arc extinguishing effect.

[0004] CN219105960U discloses an arc extinguishing chamber structure of a circuit breaker, comprising a first arc extinguishing grid group, a second arc extinguishing grid group, a third arc extinguishing grid group and a clamping plate, wherein the clamping plate is installed on both sides of the arc extinguishing grid group, the second arc extinguishing grid group is arranged between the first arc extinguishing grid group and the third arc extinguishing grid group, and the first arc extinguishing grid group, the second arc extinguishing grid group and the third arc extinguishing grid group are arranged in a horizontal U-shaped structure in the arc extinguishing chamber. The utility model increases the number of arc extinguishing grids as much as possible in a limited space by changing the layout of the grids in the arc extinguishing chamber, thereby improving the space utilization rate and optimizing the breaking performance of the circuit breaker. The scheme adopts arc extinguishing grids with fan-shaped distribution, but the tails of the arc extinguishing grids on both sides of the arc extinguishing grid group are designed to be shorter in order to avoid mutual interference, and the arc striking ability is relatively low. At the same time, due to the small air gap between the arc extinguishing grids, it is not conducive to exhaust, the temperature rise is large, and the arc extinguishing ability is relatively weak. Utility Model Content

[0005] The purpose of the utility model is to provide an arc extinguishing chamber structure of a circuit breaker in order to overcome the defects of the above-mentioned prior art. On the basis of the fan-shaped arrangement, the utility model bends the arc extinguishing grid on one side of the arc extinguishing grid group, which can avoid the technical problems of interference between adjacent grids and limited tail length of the grid caused by the fan-shaped arrangement. The bending setting can increase the gap between adjacent grids. While setting a longer tail of the grid, more arc extinguishing grids can be accommodated in the arc extinguishing chamber with limited space, thereby increasing the arc striking ability; the bent arc extinguishing grid has different bending angles, which increases the air gap space and enhances the arc extinguishing ability. Different bending angles strengthen the air outlet space, the exhaust duct is larger, and the ability to reduce temperature rise is improved. Rapidly reducing the temperature can enhance the arc extinguishing ability. At the same time, the bending setting on one side of the arc extinguishing grid group can enhance the magnetic blowing force.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] The utility model provides an arc extinguishing chamber structure of a circuit breaker, comprising: an arc extinguishing grid assembly, a support, and a support sheet, wherein the arc extinguishing grid assembly is inserted into the support, and the support sheet is arranged on both sides of the arc extinguishing grid assembly;

[0008] The arc-extinguishing grid components are arranged in a fan shape;

[0009] In the arc-extinguishing grid assembly, the tails of the arc-extinguishing grids at at least one side of the fan-shaped arrangement are provided with a bend.

[0010] Furthermore, the arc-extinguishing grid assembly includes a first grid group, a second grid group, a third grid group, a fourth grid group, a fifth grid group, a sixth grid group, and a seventh grid group which are stacked in sequence;

[0011] The tails of the grids in the fourth grid group, the fifth grid group, the sixth grid group, and the seventh grid group are bent in turn in a direction away from the third grid group, thereby increasing the air gap space of the arc extinguishing channel. The bending angles are different, and different bending angles increase the air outlet space, increase exhaust and reduce temperature rise.

[0012] Furthermore, the bending angle of the tail of each grid plate in the fourth grid plate group, the fifth grid plate group, the sixth grid plate group, and the seventh grid plate group ranges from 3° to 40°.

[0013] Furthermore, a fixing groove is provided on the supporting member, and the tail of the arc-extinguishing grid assembly is inserted into the fixing groove of the supporting member.

[0014] Furthermore, a second fixing hole is provided on the supporting sheet, a second boss is provided on the supporting member, and the second boss is inserted into the second fixing hole.

[0015] Furthermore, a fourth fixing hole is provided on the supporting plate, a first boss is provided on the arc-extinguishing grid assembly, and the first boss is inserted into the fourth fixing hole.

[0016] Furthermore, the fourth fixing hole is a square fixing hole.

[0017] Furthermore, the arc extinguishing chamber structure also includes screws, which are inserted into the third fixing holes on the support sheet and the first fixing holes on the support member at the same time, so as to strengthen and fix the support sheet and the support member.

[0018] Furthermore, the tail of the arc-extinguishing grid assembly is two square plates.

[0019] The working principle of the utility model is:

[0020] The space of the arc extinguishing chamber is limited. When the middle part of the bottom grid is bent, it not only increases the magnetic field, but also greatly increases the number of arc extinguishing grids. When the moving contact leaves the static contact, a large arc is generated. The longer tail of the arc extinguishing grid assembly will attract the arc direction. From the perspective of a single arc extinguishing grid, a magnetic field will be formed on the grid. The larger the magnetic field, the easier it is to disperse the energy of the arc. From the side, the longer tail of the arc extinguishing grid will firmly wrap the curved arc direction, increase the magnetic blowing force of the arc, and facilitate the arc to enter the arc extinguishing chamber, thereby increasing the arc striking ability. At the same time, different bending angles strengthen the air outlet space, the exhaust duct is larger, and the temperature rise is further reduced.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] (1) It can increase the magnetic field and enhance the arc striking ability. The arc extinguishing grids are arranged in a fan-shaped shape, corresponding to the direction of contact opening, which is conducive to the arc entering the arc extinguishing chamber. On the basis of the fan-shaped arrangement, the utility model bends the arc extinguishing grids on one side of the arc extinguishing grid group, which can avoid the technical problems of interference between adjacent grids and limited tail length of the grids caused by the fan-shaped arrangement. The bending setting can increase the gap between adjacent grids. While setting a longer grid tail, more arc extinguishing grids can be accommodated in the arc extinguishing chamber with limited space. More arc extinguishing grids and longer tails will firmly wrap the curved arc direction, increase the magnetic blowing force of the arc, and facilitate the arc to enter the arc extinguishing chamber, thereby further increasing the arc striking ability.

[0023] (2) The arc-extinguishing grids with different bending angles increase the air gap and enhance the arc-extinguishing ability. Different bending angles increase the air outlet space, the exhaust duct is larger, and the ability to reduce temperature rise is improved. Rapid temperature reduction can enhance the arc-extinguishing ability. At the same time, the bending setting on one side of the arc-extinguishing grid group can enhance the magnetic blowing force. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the arc extinguishing chamber structure of the circuit breaker.

[0025] Figure 2 An exploded schematic diagram of the arc extinguishing chamber structure of the circuit breaker.

[0026] Figure 3 A schematic diagram of the structure of the support.

[0027] Figure 4 The structure diagram of the arc extinguishing grid group Figure 1 (First person perspective).

[0028] Figure 5 The structure diagram of the arc extinguishing grid group Figure 2 (Second perspective).

[0029] Figure 6 Schematic diagram of the structure of the seventh grid group.

[0030] Figure 7 Schematic diagram of the generated arc.

[0031] Figure 8 A schematic diagram of the contact structure.

[0032] Figure markings: 1-arc extinguishing grid group; 2-support; 3-support plate; 4-screw; 5-arc; 6-moving contact; 11-first grid group; 12-second grid group; 13-third grid group; 14-fourth grid group; 15-fifth grid group; 16-sixth grid group; 17-seventh grid group; 171-bending portion; 172-grid tail; 173-first boss; 211-second boss; 212-first fixing hole; 213-fixing groove; 311-second fixing hole; 312-third fixing hole; 313-fourth fixing hole. DETAILED DESCRIPTION

[0033] The following is a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms and other features not clearly described in this technical solution are all considered to be common technical features disclosed in the prior art.

[0034] Example 1

[0035] The utility model provides an arc extinguishing chamber structure of a circuit breaker, such as Figure 1 As shown, it comprises: an arc-extinguishing grid assembly 1, a support member 2, and a support sheet 3, wherein the arc-extinguishing grid assembly 1 is inserted into the support member 2, and the support sheet 3 is arranged on both sides of the arc-extinguishing grid assembly 1;

[0036] like Figure 4 , Figure 5 As shown, the arc extinguishing grid assembly 1 includes a first grid group 11, a second grid group 12, a third grid group 13, a fourth grid group 14, a fifth grid group 15, a sixth grid group 16, and a seventh grid group 17 which are stacked in sequence;

[0037] The tails of the grids in the fourth grid group, the fifth grid group, the sixth grid group, and the seventh grid group are bent in a direction away from the third grid group in sequence, thereby increasing the air gap space of the arc extinguishing channel. The bending angles are different, and different bending angles increase the air outlet space, increase exhaust and reduce temperature rise. Figure 6As shown, it is a schematic diagram of the structure of the seventh grid plate group 17, on which the seventh grid plate group 17 is provided with a seventh grid plate group bending portion 171 and a seventh grid plate group tail portion 172, and first bosses 173 are provided on both sides of the seventh grid plate group 17. The bending portion 171 is provided at the connection between the main portion of the seventh grid plate 17 and the seventh grid plate group tail portion 172. Space can be saved, thereby increasing the number of arc-extinguishing plates. The middle portion of the bottom grid plate is bent at different bending angles to increase the number of arc-extinguishing grid plates. The middle portion of the bottom grid plate is bent at different bending angles, and the limited space at the bottom can accommodate more grid plates, so that more arc-extinguishing plates can be accommodated in the arc-extinguishing chamber with limited space.

[0038] like Figure 2 , Figure 3 As shown, in a specific embodiment, a fixing groove 213 is provided on the support member 2 , and the tail portion 172 of the arc-extinguishing grid assembly 1 is inserted into the fixing groove 213 of the support member 2 .

[0039] In a specific embodiment, a second fixing hole 311 is provided on the supporting sheet 3 , a second boss 211 is provided on the supporting member 2 , and the second boss 211 is inserted into the second fixing hole 311 .

[0040] In a specific implementation, a fourth fixing hole 313 is provided on the supporting plate 3 , and a first boss 173 is provided on the arc-extinguishing grid assembly 1 . The first boss 173 is inserted into the fourth fixing hole 313 .

[0041] In a specific implementation, the fourth fixing hole 313 is a square fixing hole.

[0042] In a specific implementation, the arc extinguishing chamber structure further includes screws 4 , which are inserted into the third fixing holes 312 on the support sheet 3 and the first fixing holes 212 on the support member 2 to strengthen and fix the support sheet 3 and the support member 2 .

[0043] In a specific embodiment, the tail of the arc extinguishing grid assembly 1 is two square plates.

[0044] In a specific embodiment, the tails of the second grid group 12, the third grid group 13, the fourth grid group 14, the fifth grid group 15, the sixth grid group 16, and the seventh grid group 17 are all longer than the tail of the first grid group 11. A larger number of arc-extinguishing plates and a longer tail can firmly wrap the curved arc 5, increase the magnetic field, and enhance the arc-starting ability.

[0045] In a specific embodiment, the bending angle of the tail of each grid plate in the fourth grid plate group 14, the fifth grid plate group 15, the sixth grid plate group 16, and the seventh grid plate group 17 is in the range of 3° to 40°. The bending angle is the degree of the angle between the extended surface of the body and the tail of each grid plate in the fourth grid plate group 14, the fifth grid plate group 15, the sixth grid plate group 16, and the seventh grid plate group 17. Different bending angles increase the air gap space. Different bending angles strengthen the air outlet space, the exhaust duct is larger, and the temperature rise is further reduced.

[0046] The working principle is:

[0047] like Figure 7 , Figure 8 As shown, the space of the arc extinguishing chamber is limited. When the middle part of the bottom grid is bent, it not only increases the magnetic field, but also greatly increases the number of arc extinguishing grids. When the moving contact 6 leaves the static contact, a large arc 5 is generated. The longer tail of the arc extinguishing grid assembly 1 will attract the direction of the arc 5. From the perspective of a single arc extinguishing grid, a magnetic field will be formed on the grid. The larger the magnetic field, the easier it is to disperse the energy of the arc 5. From the side, the longer tail of the arc extinguishing grid will firmly wrap the curved arc 5, thereby further increasing the arc striking ability. At the same time, different bending angles strengthen the air outlet space, the exhaust duct is larger, and the temperature rise is further reduced.

[0048] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0049] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. An arc extinguishing chamber structure of a circuit breaker, comprising: An arc-quenching grid assembly (1), a support member (2), and a support sheet (3), wherein the arc-quenching grid assembly (1) is inserted into the support member (2), and the support sheet (3) is arranged on both sides of the arc-quenching grid assembly (1), characterized in that the arc-quenching grid assembly (1) is arranged in a fan shape; In the arc-extinguishing grid assembly (1), the arc-extinguishing grids arranged in the fan shape at least on one side have tails that are bent; The arc extinguishing grid assembly (1) comprises a first grid group (11), a second grid group (12), a third grid group (13), a fourth grid group (14), a fifth grid group (15), a sixth grid group (16), and a seventh grid group (17) which are stacked in sequence; The tails of the grid plates in the fourth grid plate group (14), the fifth grid plate group (15), the sixth grid plate group (16) and the seventh grid plate group (17) are bent in sequence in a direction away from the third grid plate group (13), thereby increasing the air gap space of the arc extinguishing channel.

2. The arc extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The bending angle of the tail of each grid plate in the fourth grid plate group (14), the fifth grid plate group (15), the sixth grid plate group (16) and the seventh grid plate group (17) gradually increases.

3. The arc extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The bending angle of the tail of each grid piece in the fourth grid piece group (14), the fifth grid piece group (15), the sixth grid piece group (16) and the seventh grid piece group (17) is in the range of 3° to 40°.

4. The arc extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The support member (2) is provided with a plurality of fixing grooves (213), and the tail of each grid in the arc-extinguishing grid assembly (1) is inserted into each fixing groove (213) of the support member (2).

5. The arc extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The supporting sheet (3) is provided with a second fixing hole (311), the supporting member (2) is provided with a second boss (211), and the second boss (211) is inserted into the second fixing hole (311).

6. The arc extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: A fourth fixing hole (313) is provided on the supporting plate (3), and each grid plate in the arc-extinguishing grid plate assembly (1) is provided with a first boss (173), wherein the first boss (173) is inserted into the fourth fixing hole (313).

7. The arc extinguishing chamber structure of a circuit breaker according to claim 6, characterized in that: The fourth fixing hole (313) is a square fixing hole.

8. The arc extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The arc extinguishing chamber structure also includes a screw (4), the screw (4) being inserted through both a third fixing hole (312) on the supporting plate (3) and a first fixing hole (212) on the supporting member (2).

9. The arc extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The tail of each grid in the arc-extinguishing grid assembly (1) comprises two square pieces.

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