Sealing structure for arc extinguish chamber of circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a sealing structure of an arc extinguish chamber of a circuit breaker. A sealing structure of an arc extinguish chamber of a circuit breaker comprises two fixing plates, and a grid sheet group is fixed between the two fixing plates. The static contact cover is located between the two fixing plates, and the two sides of the static contact cover extend towards the fixing plates and abut against the fixing plates; the insulating baffle plate is assembled at the front end of the static contact cover, the front end of the static contact cover extends to form a limiting part, and the bottom of the insulating baffle plate is clamped on the limiting part and clings to the limiting part. The circuit breaker arc extinguish chamber solves the technical problem that in the prior art, gaps between arc extinguish grid pieces of a circuit breaker arc extinguish chamber are large, gas generated by arc extinguish materials is prone to leakage, and the arc extinguish effect is poor.

Description

Technical Field

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

[0002] At present, the circuit breakers on the market are all equipped with arc extinguishing chambers for arc extinguishing. The arc enters the arc extinguishing chamber from the point where the moving contact and the static contact contact each other. The arc extinguishing chamber is composed of several arc extinguishing grids and an arc extinguishing cover that wraps all the arc extinguishing grids. Driven by the magnetic field and fluid effect in the arc extinguishing chamber, the arc is separated into multiple short arcs by multiple arc isolation grids to achieve the arc extinguishing effect.

[0003] In actual work, the setting of the arc extinguishing grid of the arc extinguishing system has an important influence on the arc extinguishing effect. For example, the document with application number CN202320438828.X discloses an arc extinguishing chamber of a circuit breaker, and specifically discloses: an arc extinguishing chamber of a circuit breaker, including an arc extinguishing grid group and side plates located on both sides of the arc extinguishing grid group, the front side of the arc extinguishing grid group forms an arc extinguishing space, an insulating protective member is arranged in the arc extinguishing space, the bottom of the insulating protective member forms a covering cavity for covering the static contact, and the two sides of the covering cavity have extension plates extending upward, the extension plates protrude from the arc extinguishing grid group and are used to cover the contact end of the moving contact. The insulating protective member is made of gas-generating arc extinguishing material, such as nylon 6, nylon 66, etc.

[0004] The arc extinguishing chamber of the circuit breaker in the above document can achieve a certain arc extinguishing effect, but there are gaps between the arc extinguishing grids in the arc extinguishing grid group. When the gap is too large, the gas generated by the gas-generating arc extinguishing material is easy to leak, thus affecting the arc extinguishing effect. Utility Model Content

[0005] In order to solve the technical problems in the prior art that the gaps between the arc extinguishing grids of the arc extinguishing chamber of the circuit breaker are large, the gas generated by the arc extinguishing material is easy to leak, and the arc extinguishing effect is poor, the utility model provides a sealing structure for the arc extinguishing chamber of the circuit breaker to solve the above technical problems.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] The utility model provides a circuit breaker arc extinguishing chamber sealing structure, comprising:

[0008] A fixed plate, with a grid group fixed between two fixed plates;

[0009] A stationary contact cover, the stationary contact cover is located between two fixed plates, and two sides of the stationary contact cover extend toward the fixed plates and are close to the fixed plates;

[0010] The insulating baffle is assembled at the front end of the static contact cover, the front end of the static contact cover extends to form a limiting portion, and the bottom of the insulating baffle is clamped on the limiting portion and closely attached to the limiting portion.

[0011] According to an embodiment of the utility model, protrusions are formed at both ends of the bottom of the insulating baffle, and the insulating baffle is clamped on the limiting portion through the protrusions.

[0012] According to an embodiment of the present utility model, the upper end surface of the limiting portion is L-shaped, and the lower surface and the side surface of the insulating baffle are both in close contact with the upper end surface of the limiting portion.

[0013] According to an embodiment of the utility model, it further comprises a shell, wherein side grooves are formed on both sides of the shell corresponding to the insulating baffle, and both sides of the insulating baffle extend into the side grooves.

[0014] According to an embodiment of the utility model, it also includes a static contact, which is bent, with one end of the static contact extending into the static contact cover, and the other end of the static contact extending out of the static contact cover.

[0015] According to an embodiment of the utility model, a limiting groove is formed on the outer surface of the limiting portion, and the static contact is limited by the limiting groove.

[0016] According to an embodiment of the utility model, it also includes a moving contact, which is hingedly assembled, and the swing end of the moving contact has an upper outer protrusion extending toward the grid plate group.

[0017] According to an embodiment of the utility model, the moving contact is bent, and comprises a first section and a second section that are bent and connected, the first section is hingedly assembled, and the second section is bent relative to the first section in a direction away from the stationary contact.

[0018] According to an embodiment of the utility model, the grid group includes a plurality of vertical arc-extinguishing grids arranged vertically and a plurality of horizontal arc-extinguishing grids arranged horizontally, and the vertical arc-extinguishing grids and the horizontal arc-extinguishing grids are transitioned by bending the arc-extinguishing grids.

[0019] According to an embodiment of the present invention, one side of the bent arc-extinguishing grid is parallel to the adjacent vertical arc-extinguishing grid, and the other side is parallel to the adjacent horizontal arc-extinguishing grid.

[0020] Based on the above technical solution, the technical effects that can be achieved by the utility model are:

[0021] The arc extinguishing chamber sealing structure of the circuit breaker of the utility model is provided with two sides of the static contact cover extending toward the fixed plate and close to the fixed plate, so that a seal is formed between the two sides of the static contact cover and the fixed plate; the insulating baffle is assembled at the front end of the static contact cover, and the bottom of the insulating baffle is provided to be clamped on the limiting part on the static contact cover and close to the limiting part, so that the gap between the insulating baffle and the limiting part is small and the sealing is good. In this way, when the circuit breaker is working, the gas generated in the arc extinguishing chamber is not easy to leak, thereby ensuring the arc extinguishing effect;

[0022] In the arc extinguishing chamber sealing structure of the circuit breaker of the utility model, protrusions are formed at both ends of the bottom of the insulating baffle, which can be clamped on the limiting part, and the lower surface and the side surface of the insulating baffle are tightly attached to the limiting part, so that the position between the insulating baffle and the limiting part is limited, and the tightly attached area is increased, so that the connection between the insulating baffle and the limiting part has good sealing performance and no leakage exists;

[0023] The arc extinguishing chamber sealing structure of the circuit breaker of the utility model has side grooves formed on the shell, and the two sides of the insulating baffle extend into the side grooves, which can limit the position of the insulating baffle and prevent the insulating baffle from tilting; at the same time, the shell can extend into the gap between the side of the insulating baffle and the fixed plate to cover the gap and ensure the sealing performance;

[0024] In the arc extinguishing chamber sealing structure of the circuit breaker of the utility model, the vertical arc extinguishing grid and the horizontal arc extinguishing grid in the grid group are transitioned by bending the arc extinguishing grid, and the bent arc extinguishing grid can block the larger gap between the vertical arc extinguishing grid and the horizontal arc extinguishing grid, thereby reducing gas leakage;

[0025] The utility model discloses a sealing structure for an arc extinguishing chamber of a circuit breaker, wherein an upper outer convex portion is formed at the deflecting end of the moving contact, so that when the moving contact is deflected, the upper outer convex portion can be closer to the grid plate group, thereby facilitating the arc guidance to the grid plate group for arc extinguishing; the moving contact is bent, and the second section of the moving contact is bent away from the moving contact relative to the first section, so that the opening between the moving contact and the static contact is large, and when disconnected, the moving contact can be further away from the static contact, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the arc extinguishing chamber sealing structure of the circuit breaker of the utility model;

[0027] Figure 2 A schematic diagram of the structure of the arc extinguishing chamber sealing structure of the circuit breaker after the upper housing is omitted;

[0028] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0029] Figure 4 A schematic diagram of the structure of the arc extinguishing chamber sealing structure of the circuit breaker after the lower housing is omitted;

[0030] Figure 5 for Figure 4 Enlarged view of middle part B;

[0031] Figure 6 It is a structural schematic diagram of the arc extinguishing chamber of the circuit breaker;

[0032] Figure 7 The schematic diagram of the structure of the arc extinguishing chamber of the circuit breaker after omitting the fixing plate on one side;

[0033] Figure 8-10 It is a schematic diagram of the structure of the static contact cover;

[0034] Fig.11 is a schematic diagram of the structure of the insulating baffle;

[0035] Fig.12 It is a structural schematic diagram of the upper shell;

[0036] Fig.13 for Fig.12 The enlarged view of the C part in FIG.

[0037] Fig.14 is a schematic diagram of the structure of the lower shell;

[0038] Fig.15 for Fig.14 The enlarged view of the D part in FIG.

[0039] Fig.16 It is a structural schematic diagram of the static contact;

[0040] Fig.17 It is a structural schematic diagram of the moving contact;

[0041] In the figure: 1-fixed plate; 2-grid group; 21-vertical arc-extinguishing grid; 22-lateral arc-extinguishing grid; 23-bent arc-extinguishing grid; 3-stationary contact cover; 31-limiting part; 311-upper end surface; 312-limiting groove; 32-opening; 4-insulating baffle; 41-protrusion; 5-housing; 51-upper shell; 511-upper side groove; 512-upper protrusion; 52-lower shell; 521 lower side groove; 522-lower protrusion; 6-stationary contact; 61-transition section; 62-stationary contact; 7-moving contact; 71-first section; 72-second section; 721-upper outer protrusion; 73-moving contact. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0045] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0046] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0047] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0048] like Figure 1-17 As shown, this embodiment provides a sealing structure of an arc extinguishing chamber of a circuit breaker, including a fixed plate 1, a grid group 2, a static contact cover 3, an insulating baffle 4 and a shell 5. The fixed plates 1 cooperate with each other, and the grid group 2 is arranged between the two fixed plates 1. The static contact cover 3 is also located between the two fixed plates 1. The static contact cover 3 extends from one side of the grid group 2 to the other side. The height of the front end of the static contact cover 3 is lower than the height of the rear end. The insulating baffle 4 is assembled at the front end of the static contact cover 3, and cooperates with the shell 5, so that the grid group 2 is in a relatively sealed space.

[0049] The fixing plate 1 is plate-shaped, and two matching fixing plates 1 are arranged in parallel and spaced apart. A plurality of holes are provided on the fixing plate 1 to facilitate the insertion of arc-extinguishing grids in the grid group 2 .

[0050] The grid group 2 is inserted on the fixing plates 1 on both sides, and the grid group 2 includes a plurality of arc-extinguishing grids, which are arranged from the lower end to the upper end, corresponding to the arc track distribution between the contacts of the circuit breaker. The grid group 2 includes a plurality of vertical arc-extinguishing grids 21 arranged vertically and a plurality of horizontal arc-extinguishing grids 22 arranged horizontally, and the plurality of horizontal arc-extinguishing grids 22 arranged horizontally are located above the plurality of vertical arc-extinguishing grids 21 arranged vertically.

[0051] As a preferred technical solution of this embodiment, since the angles of the adjacent vertical arc-extinguishing grids 21 and the horizontal arc-extinguishing grids 22 differ greatly and the gaps between the adjacent vertical arc-extinguishing grids 21 and the horizontal arc-extinguishing grids 22 are large, in this embodiment, the grid group 2 further includes a bent arc-extinguishing grid 23, and the adjacent vertical arc-extinguishing grids 21 and the horizontal arc-extinguishing grids 22 are transitioned through the bent arc-extinguishing grids 23. Specifically, the bent arc-extinguishing grid 23 includes two angled surfaces, one surface is parallel to the adjacent vertical arc-extinguishing grids 21, and the other surface is parallel to the adjacent horizontal arc-extinguishing grids 22.

[0052] The static contact cover 3 is U-shaped and extends from the front side to the rear side of the grid group 2. The height of the front end of the static contact cover 3 is lower than that of the rear end. The insulating baffle 4 is assembled at the front end of the static contact cover 3.

[0053] The front end of the static contact cover 3 extends to form a limiting portion 31, and the insulating baffle 4 is assembled on the limiting portion 31 of the static contact cover 3; the rear end of the static contact cover 3 is formed with an opening 32, the opening 32 extends vertically, and the moving contact 7 extends from the opening 32 to cooperate with the static contact 6.

[0054] As a preferred technical solution of this embodiment, both sides of the static contact cover 3 extend toward the fixed plate 1, and the two side surfaces of the static contact cover 3 are closely attached to the fixed plate 1 to ensure sealing.

[0055] As a preferred technical solution of this embodiment, the upper end surface 311 of the limiting portion 31 is L-shaped, and the insulating baffle 4 is clamped on the limiting portion 31 and is in close contact with the upper end surface 311 of the limiting portion 31. Specifically, the lower surface of the insulating baffle 4 is in close contact with the upper plane of the upper end surface 311, and the front side surface of the insulating baffle 4 is in close contact with the vertical surface of the upper end surface 311, so that the close contact area between the insulating baffle 4 and the limiting portion 31 is increased, and the sealing of the connection between the insulating baffle 4 and the limiting portion 31 is ensured.

[0056] As a preferred technical solution of this embodiment, the static contact 6 is assembled closely to the static contact cover 3, the static contact 6 is bent, the front end of the static contact 6 is located in front of the limiting portion 31 and extends horizontally, and the front end of the static contact 6 is connected to the power supply; the middle part of the static contact 6 extends along the outer surface of the static contact cover 3, and the rear end of the static contact 6 is bent and extends into the static contact cover 3, and the end is provided with a static contact point 62 for working with the moving contact 7. The part of the static contact 6 that fits the limiting portion 31 of the static contact cover 3 is a transition section 61, and correspondingly, a limiting groove 312 is formed on the front end outer surface of the limiting portion 31, and the transition section 61 of the static contact 6 can be embedded in the limiting groove 312 to limit the relative position of the static contact 6 and the static contact cover 3.

[0057] The insulating baffle 4 is plate-shaped, and protrusions 41 are formed at two ends of the bottom of the insulating baffle 4 . The insulating baffle 4 is clamped on the limiting portion 31 of the static contact cover 3 through the two protrusions 41 .

[0058] There is a gap between the two sides of the insulating baffle 4 and the fixed plate 1, and the shell 5 limits the insulating baffle 4 and eliminates the gap between the insulating baffle 4 and the fixed plate 1. Specifically, the shell 5 cooperates with the two sides of the fixed plate 1 to form side grooves, and one side of the side groove extends into the gap between the insulating baffle 4 and the fixed plate 1 to eliminate the gap.

[0059] As a preferred technical solution of this embodiment, the shell 5 is a split structure, and the shell 5 includes an upper shell 51 and a lower shell 52. An upper groove 511 is formed on the inner wall of the upper shell 51 corresponding to the side of the insulating baffle 4, and an upper protrusion 512 is formed on one side of the upper groove 511. When the side of the insulating baffle 4 extends into the upper groove 511, the upper protrusion 512 is placed in the gap between the side of the insulating baffle 4 and the fixed plate 1; a lower groove 521 is formed on the inner wall of the lower shell 52 corresponding to the side of the insulating baffle 4, and a lower protrusion 522 is formed on one side of the lower groove 521. When the side of the insulating baffle 4 extends into the lower groove 521, the lower protrusion 522 is placed in the gap between the side of the insulating baffle 4 and the fixed plate 1.

[0060] The moving contact 7 is hingedly assembled, and the moving contact 7 cooperates with the stationary contact 6. In this embodiment, the moving contact 7 is a bent structure, which includes a first section 71 and a second section 72 connected to each other, and an end of the first section 71 away from the second section 72 is hingedly assembled, and a moving contact point 73 is provided below an end of the second section 72 away from the first section 71.

[0061] As a preferred technical solution of this embodiment, the second section 72 is bent relative to the first section 71 in a direction away from the stationary contact 6 to increase the opening between the stationary contact 6 and the moving contact 7 .

[0062] As a preferred technical solution of this embodiment, an upper outer protrusion 721 is formed at one end of the second section 72 away from the first section 71 . When disconnected, the upper outer protrusion 721 is closer to the grid assembly 2 to facilitate arc initiation to the grid assembly 2 .

[0063] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A circuit breaker arc extinguishing chamber sealing structure, characterized in that: include: A fixed plate (1), wherein a grid plate group (2) is fixed between two fixed plates (1); A stationary contact cover (3), the stationary contact cover (3) being located between the two fixed plates (1), with two sides of the stationary contact cover (3) extending towards the fixed plates (1) and being close to the fixed plates (1); An insulating baffle (4) is mounted on the front end of the stationary contact cover (3), the front end of the stationary contact cover (3) extending to form a limiting portion (31), and the bottom of the insulating baffle (4) is clamped on the limiting portion (31) and closely attached to the limiting portion (31).

2. A circuit breaker arc extinguishing chamber sealing structure according to claim 1, characterized in that: Protrusions are formed at both ends of the bottom of the insulating baffle (4), and the insulating baffle (4) is clamped on the limiting portion (31) via the protrusions.

3. A circuit breaker arc extinguishing chamber sealing structure according to claim 1, characterized in that: The upper end surface of the limiting portion (31) is L-shaped, and the lower surface and side surfaces of the insulating baffle (4) are both in close contact with the upper end surface of the limiting portion (31).

4. A circuit breaker arc extinguishing chamber sealing structure according to any one of claims 1 to 3, characterized in that: It also comprises a shell (5), the shell (5) being provided with side grooves on two sides corresponding to the insulating baffle (4), and the two sides of the insulating baffle (4) extending into the side grooves.

5. A circuit breaker arc extinguishing chamber sealing structure according to claim 4, characterized in that: It also comprises a stationary contact (6), the stationary contact (6) being in a bent shape, one end of the stationary contact (6) extending into the stationary contact cover (3), and the other end of the stationary contact (6) extending out of the stationary contact cover (3).

6. A circuit breaker arc extinguishing chamber sealing structure according to claim 5, characterized in that: A limiting groove (312) is formed on the outer surface of the limiting portion (31), and the stationary contact (6) is limited by the limiting groove (312).

7. A circuit breaker arc extinguishing chamber sealing structure according to claim 5, characterized in that: It also comprises a moving contact (7), the moving contact (7) being hingedly assembled, and an upper outer protrusion (721) extending from the swing end of the moving contact (7) towards the grid plate group (2).

8. A circuit breaker arc extinguishing chamber sealing structure according to claim 7, characterized in that: The movable contact (7) is in a bent shape, comprising a first section (71) and a second section (72) which are bent and connected to each other, the first section (71) being hingedly assembled, and the second section (72) being bent relative to the first section (71) in a direction away from the stationary contact (6).

9. The arc extinguishing chamber sealing structure of a circuit breaker according to claim 1, characterized in that: The grid plate group (2) comprises a plurality of vertical arc-extinguishing grid plates (21) arranged vertically and a plurality of horizontal arc-extinguishing grid plates (22) arranged horizontally, wherein the vertical arc-extinguishing grid plates (21) and the horizontal arc-extinguishing grid plates (22) are transitioned via bent arc-extinguishing grid plates (23).

10. A circuit breaker arc extinguishing chamber sealing structure according to claim 9, characterized in that: One side of the bent arc-extinguishing grid (23) is parallel to the adjacent vertical arc-extinguishing grid (21), and the other side is parallel to the adjacent horizontal arc-extinguishing grid (22).

Images