Buckle type moving contact electric arc reverse spraying prevention protective cover

Abstract

The utility model relates to a protective cover, in particular to a buckle type moving contact electric arc reverse spraying prevention protective cover, which comprises a rotating shaft knife pouch and a moving contact which are in running fit, the moving contact is provided with a cover body which at least partially wraps the moving contact, and the cover body is fixedly connected with the moving contact in a clamping manner. According to the utility model, the protective cover is arranged on the outer side of the moving contact of the circuit breaker, the protective cover is fixed on the moving contact in a clamping manner, the installation is convenient, the added protective cover prevents reverse spraying of electric arcs and has a very good cooling effect on the electric arcs, and an electric arc suppression effect is generated; the utility model also has the characteristics of simple structure, convenience in processing and easiness in assembly, and has strong practicability.

Description

Technical Field

[0001] The utility model relates to a protective cover, in particular to a snap-on type moving contact arc back-spray protection cover. Background Art

[0002] Most of the moving contacts of circuit breakers on the market do not have protective covers, or some have protective covers but are fixed with rivets, making it difficult to install and remove the protective covers. For example, the patent with publication number CN101114556B, entitled "Circuit breaker rotating double breakpoint contact system and its spring protection structure", does not have a protective cover. How to design a protective cover that is easy to install and remove is a technical problem that we need to solve now. Utility Model Content

[0003] In view of the deficiencies in the existing technology, the utility model provides a snap-on type moving contact arc back-spray protection cover.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a snap-on moving contact arc back-spray protection cover, including a rotatably matched rotating shaft knife sleeve and a moving contact, characterized in that a cover body is provided on the moving contact, which at least partially wraps the moving contact, and the cover body and the moving contact are fixedly connected by a snap-on method.

[0005] The cross section of the cover body is a U-shaped structure, and the cover body is fixedly connected to the outer side of the moving contact by wrapping three sides of a continuous A side, a B side and a C side.

[0006] The moving contact is provided with a plurality of protrusions, and the cover body is provided with limiting holes matching the protrusions at positions relative to the protrusions, and the cover body and the moving contact are connected by the protrusions being inserted into the limiting holes.

[0007] The number of the limiting holes is two, and they are respectively arranged on the A surface and the C surface.

[0008] The axial directions of the two limiting holes do not overlap.

[0009] The rotating shaft knife sleeve is provided with a limiting groove for cooperating with the moving contact to rotate, and the cover body is provided with an arc blocking plate for shielding the limiting groove and arranged along the length direction of the limiting groove.

[0010] Wing plates are arranged along the width direction of the limiting groove on both sides of the arc baffle plate.

[0011] The arc baffle has an arc-shaped structure that cooperates with the moving contact to rotate.

[0012] The arc baffle plate and the cover body are an integrated structure.

[0013] The arc baffle plate and the cover body are made of plastic.

[0014] The beneficial effects of the utility model are as follows: the utility model provides a protective cover on the outer side of the moving contact of the circuit breaker, and the protective cover is fixed on the moving contact by a clip-on method, which is convenient for installation. The added protective cover prevents arc back-spray and has a very good cooling effect on the arc, thereby suppressing the arc. The utility model also has the characteristics of simple structure, convenient processing and easy assembly, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a structural exploded diagram of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the cover body of the utility model. DETAILED DESCRIPTION

[0018] like Figure 1-Figure 3 As shown, a snap-on protective cover for a moving contact 200 comprises a rotating shaft knife sleeve 100 and a moving contact 200 that are rotatably matched. A cover body 300 is provided on the moving contact 200, which at least partially wraps the moving contact 200. The cover body 300 and the moving contact 200 are fixedly connected by snapping. The arc is caused by an excessively strong electric field, which causes the gas to undergo electrical collapse and continuously form plasma, so that the current passes through an insulating medium (such as air) in a normal state, generating an instantaneous spark phenomenon. The cover body 300 is arranged near the moving contact 200, and the generated arc touches the cover body 300, which will generate a gas-cooled arc, and has a very good effect on suppressing the arc.

[0019] The cross section of the cover body 300 is a U-shaped structure. The cover body 300 is fixedly connected to the outer side of the moving contact 200 by wrapping three sides of a continuous A surface 310, a B surface 320 and a C surface 330. Since the cross section of the circuit breaker moving contact 200 is generally designed to be approximately square, designing the cover body 300 into a U-shaped structure facilitates installation.

[0020] The moving contact 200 is provided with a plurality of protrusions 210, and a limiting hole 340 matching the protrusion 210 is provided on the cover body 300 and at a position relative to the protrusion 210. The cover body 300 and the moving contact 200 are connected by the protrusions 210 being snapped into the limiting holes 340. The cover body 300 and the moving contact 200 are connected by the protrusions 210 and the limiting holes 340, which is convenient for loading and unloading.

[0021] There are two limiting holes 340 , which are respectively disposed on the A surface 310 and the C surface 330 . Through continuous experiments, the design of the two limiting holes 340 can take into account both structural stability and cost savings.

[0022] The axial directions of the two limiting holes 340 do not overlap, and the two limiting holes 340 are staggered, which effectively prevents the relative movement between the movable cover and the movable contact 200 and improves the connection stability.

[0023] The shaft knife sleeve 100 is provided with a limiting groove 110 for cooperating with the moving contact 200 to rotate, and the cover body 300 is provided with an arc baffle plate 350 for shielding the limiting groove 110 and arranged along the length direction of the limiting groove 110. The arc baffle plate 350 is equivalent to an anti-backspray plate, which is used to prevent the moving contact 200 from separating from the static contact (not shown in the figure). The arc generated between the moving contact 200 and the static contact is directed toward the surface of the operating mechanism, causing the mechanism to fail, increasing the back pressure of the arc between the contacts, so that the arc can be smoothly discharged from the outlet position of the product outlet end, thereby solving the problem of the arc spraying toward the surface of the mechanism to the greatest extent, and having strong practicality.

[0024] The arc baffle plate 350 is provided with wing plates 351 arranged along the width direction of the limiting groove 110 on both sides. The addition of the wing plates 351 can further enhance the protection range and has strong practicality.

[0025] The arc baffle plate 350 has an arc-shaped structure that cooperates with the rotation of the moving contact 200. The two side end surfaces of the limiting groove 110 are generally also arc-shaped. Therefore, designing the arc baffle plate 350 into an arc-shaped structure can better fit and cover the limiting groove 110 during the rotation of the moving contact 200.

[0026] The arc baffle plate 350 and the cover body 300 are an integrated structure, and the structure is more reliable and stable.

[0027] The arc baffle plate 350 and the cover body 300 are made of plastic material, and nylon synthetic material is recommended for better protection effect.

[0028] The above shows and describes the basic principle, main features and advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, simple changes and substitutions by ordinary technicians in this field are within the protection scope of the utility model.

Claims

1. A snap-on moving contact arc back-spray protection cover, comprising a rotating shaft knife sleeve (100) and a moving contact (200) that are rotatably matched, characterized in that: The moving contact (200) is provided with a cover body (300) which at least partially wraps the moving contact (200), and the cover body (300) and the moving contact (200) are fixedly connected by means of a snap connection.

2. A snap-on moving contact arc back-spray protection cover as claimed in claim 1, characterized in that: The cross section of the cover body (300) is a U-shaped structure, and the cover body (300) is fixedly connected to the outer side of the moving contact (200) by wrapping three sides of a continuous A side (310), a B side (320) and a C side (330).

3. A snap-on moving contact arc back-spray protection cover as claimed in claim 2, characterized in that: The moving contact (200) is provided with a plurality of protrusions (210), and a limiting hole (340) matching the protrusion (210) is provided on the cover body (300) at a position relative to the protrusion (210), and the cover body (300) and the moving contact (200) are connected by snapping the protrusion (210) into the limiting hole (340).

4. A snap-on moving contact arc back-spray protection cover as claimed in claim 3, characterized in that: The number of the limiting holes (340) is two, and they are respectively arranged on the A surface (310) and the C surface (330).

5. The snap-on moving contact arc back-spray protection cover as claimed in claim 4, characterized in that: The axial directions of the two limiting holes (340) do not overlap.

6. A snap-on moving contact arc back-spray protection cover as claimed in any one of claims 1 to 5, characterized in that: The rotating shaft blade sleeve (100) is provided with a limiting groove (110) for cooperating with the moving contact (200) to rotate, and the cover body (300) is provided with an arc blocking plate (350) for shielding the limiting groove (110) and arranged along the length direction of the limiting groove (110).

7. A snap-on moving contact arc back-spray protection cover as claimed in claim 6, characterized in that: Wing plates (351) are provided on both sides of the arc baffle plate (350) and are arranged along the width direction of the limiting groove (110).

8. The snap-on moving contact arc back-spray protection cover according to claim 7, characterized in that: The arc blocking plate (350) has an arc-shaped structure that cooperates with the moving contact (200) to rotate.

9. The snap-on moving contact arc back-spray protection cover according to claim 6, characterized in that: The arc baffle plate (350) and the cover body (300) are an integrated structure.

10. A snap-on moving contact arc back-spray protection cover as claimed in claim 9, characterized in that: The arc baffle plate (350) and the cover body (300) are made of plastic.

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