Arc extinguishing system of molded case circuit breaker

Abstract

The utility model relates to an arc extinguishing system of a molded case circuit breaker. The arc extinguishing system comprises an arc extinguishing chamber, an arc extinguishing grid sheet group, a short arc extinguishing grid group, an arc isolating piece, an arc isolating cover, an arc striking plate and a magnetism increasing plate, wherein the arc extinguishing grid sheet group is arranged in the arc extinguishing chamber, and one side of the arc extinguishing grid sheet group is provided with a moving contact abdicating space; the static contact is U-shaped, the front end is used for connecting the connecting plate, and the rear end is used for contacting with the moving contact; a short arc chute group is arranged below the arc chute sheet group; the end tab is connected to the rear end of the static contact and extends to the lower side of the short arc chute group; the arc-isolating cover covers the rear end of the static contact, and the arc-isolating piece covers the static contact and extends from the front end to be connected with the arc-isolating cover so as to wrap the static contact in an insulating manner. Compared with the prior art, through the ingenious structural design, all-around insulation protection on the static contact is achieved in a narrow space left between the static contact and the arc extinguish chamber, the breaking capacity of the circuit breaker is improved, the electrical service life of the circuit breaker is prolonged, a local magnetism increasing structure is additionally arranged, the breaking capacity is improved, the electrical service life of the circuit breaker is prolonged, and meanwhile cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers and relates to an arc extinguishing system of a molded case circuit breaker. Background Art

[0002] In the arc extinguishing system of the circuit breaker, the number of grids in the arc extinguishing chamber and the insulation of the entire arc occurrence area have always occupied an important position. Under the trend of miniaturization of the overall size of the circuit breaker, the size of each component of the arc extinguishing system is limited. How to design a structural solution that can take into account many factors that are conducive to arc extinguishing in a small space has always been a focus and difficulty in the industry. Utility Model Content

[0003] The purpose of the utility model is to provide an arc extinguishing system for a molded case circuit breaker, which can accommodate more arc extinguishing grids and enhance the magnetic blowing and arc extinguishing system insulation capacity in key areas. The high-performance arc extinguishing system has the advantages of simple and compact structure, easy assembly and low manufacturing cost.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] An arc extinguishing system for a molded case circuit breaker, comprising an arc extinguishing chamber, an arc extinguishing grid group, a short arc extinguishing grid group, an arc isolating member, an arc isolating cover, an arc striking plate, and a magnetizing plate;

[0006] The arc extinguishing grid group is arranged in the arc extinguishing chamber, and a moving contact clearance space is provided on one side;

[0007] The static contact is U-shaped, with the front end used to connect to the connecting plate and the rear end used to contact with the moving contact;

[0008] A short arc extinguishing grid group is provided between the front and rear ends of the static contact and below the arc extinguishing grid group, and the arc striking plate is connected to the rear end of the static contact and extends to the lower side of the short arc extinguishing grid group;

[0009] The arc isolation cover is arranged at the rear end of the static contact and is provided with a slot to expose the connection area between the moving and static contacts. The arc isolation member covers the static contact and extends from the front end to connect with the arc isolation cover to insulate and cover the static contact.

[0010] The magnetizing plates are arranged on both sides of the contact area between the moving and static contacts.

[0011] Furthermore, the arc-extinguishing grid group includes a plurality of arc-extinguishing grids arranged at intervals.

[0012] Furthermore, a U-shaped slot is provided on one side of the plurality of arc-extinguishing grids to form a clearance space for the moving contacts.

[0013] Furthermore, a first arc isolation grid and a second arc isolation grid are respectively provided on both sides of the movable contact yielding space, and the first arc isolation grid and the second arc isolation grid covers are arranged on the rear end and the side wall of the arc extinguishing grid plate group.

[0014] Furthermore, a plurality of arc isolation plates are provided on the first arc isolation grid and the second arc isolation grid, and the arc isolation plates are embedded between adjacent arc extinguishing grid plates.

[0015] Furthermore, the magnetizing plate is arranged below the arc extinguishing grid group.

[0016] Furthermore, a magnetizing plate installation groove is provided on the first arc isolation grid and the second arc isolation grid at a side away from the movable contact clearance space, and the magnetizing plate is arranged in the magnetizing plate installation groove.

[0017] Furthermore, the arc extinguishing chamber comprises a parallelly arranged mounting plate, a plurality of grid mounting holes are arranged on the mounting plate, mounting blocks are arranged on both sides of the arc extinguishing grid, and the arc extinguishing grid is installed in the arc extinguishing chamber through the plug-fitting grid mounting holes and mounting blocks.

[0018] Furthermore, the mounting plate is provided with a plurality of arc isolation mounting holes, the first arc isolation grid and the second arc isolation grid are respectively provided with a plurality of arc isolation mounting blocks, and the first arc isolation grid and the second arc isolation grid are installed in the arc extinguishing chamber through the arc isolation mounting holes and arc isolation mounting blocks that are plugged in.

[0019] Furthermore, the short arc-extinguishing grid group includes a plurality of short arc-extinguishing grids.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1) The utility model adds some short arc extinguishing grids at the lower part of the arc extinguishing chamber and provides a magnetizing plate near the most critical contact area between the moving and static contacts, thereby improving the performance of the arc extinguishing system from the perspective of economy.

[0022] 2) The utility model, through ingenious structural design, achieves all-round insulation protection for the static contact in the narrow space remaining between the static contact and the arc extinguishing chamber, thereby improving the breaking capacity and electrical life of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of an arc extinguishing system of a molded case circuit breaker in the utility model;

[0024] Figure 2 It is a schematic diagram of the assembly structure of the static contact, arc isolation member, arc isolation cover and arc striking plate;

[0025] Figure 3 This is the exploded view of the arc extinguishing chamber and magnetizing plate;

[0026] Figure 4 It is a longitudinal cross-sectional view of an arc extinguishing system of a molded case circuit breaker in the utility model;

[0027] Figure 5It is a transverse cross-sectional view of an arc extinguishing system of a molded case circuit breaker in the utility model;

[0028] Description of the markings in the figure:

[0029] 1-static contact, 11-arc striking plate; 2-arc isolating member; 3-arc isolating cover; 4-arc extinguishing chamber, 41-short arc extinguishing grid; 51-first arc isolating grid, 52-second arc isolating grid; 6-moving contact; 7-magnetizing plate. DETAILED DESCRIPTION

[0030] The following embodiments are implemented based on the above technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following embodiments.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] Example:

[0034] like Figure 1 The arc extinguishing system of a molded case circuit breaker has the main function of quickly introducing the arc into the arc extinguishing chamber and cutting it into more short arcs to achieve the purpose of extinguishing the arc, improve the insulation effect around the static contact, prevent the static contact from being burned by the arc after arcing, and improve the breaking capacity and electrical life of the circuit breaker.

[0035] It includes an arc extinguishing chamber 4, an arc extinguishing grid group, a short arc extinguishing grid group, an arc isolation member 2, an arc isolation cover 3, and an arc striking plate 11; the arc extinguishing grid group is arranged in the arc extinguishing chamber 4, and a moving contact clearance space is provided on one side; the static contact 1 is U-shaped, and the front end is used to connect the connecting plate, and the rear end is used to contact with the moving contact 6; a short arc extinguishing grid group is provided between the front and rear ends of the static contact 1 and below the arc extinguishing grid group, and the arc striking plate 11 is connected to the rear end of the static contact 1 and extends to the lower side of the short arc extinguishing grid group; the arc isolation cover 3 is provided at the rear end of the static contact 1 and is provided with a groove to expose the moving and static contact connection area, the arc isolation member 2 covers the static contact 1, and extends from the front end to connect with the arc isolation cover 3 to insulate and cover the static contact 1.

[0036] In this embodiment, the arc extinguishing grid group includes a plurality of arc extinguishing grids arranged at intervals.

[0037] In this embodiment, a U-shaped slot is provided on one side of the plurality of arc-extinguishing grids to form a clearance space for the moving contacts.

[0038] In this embodiment, a first arc isolation grid 51 and a second arc isolation grid 52 are respectively disposed on both sides of the movable contact clearance space, and the first arc isolation grid 51 and the second arc isolation grid 52 are covered on the rear end and side wall of the arc extinguishing grid group.

[0039] In this embodiment, a plurality of arc isolation plates are provided on the first arc isolation grid 51 and the second arc isolation grid 52 , and the arc isolation plates are embedded between adjacent arc extinguishing grid plates.

[0040] In this embodiment, magnetizing plates 7 are provided below the arc extinguishing grid group and on both sides of the rear end of the stationary contact.

[0041] In this embodiment, a magnetizing plate installation groove 512 is provided on the first arc isolation grid 51 and the second arc isolation grid 52 at a side away from the movable contact clearance space, and the magnetizing plate 7 is arranged in the magnetizing plate installation groove 512 .

[0042] In this embodiment, the arc extinguishing chamber 4 includes parallel mounting plates, on which a plurality of grid mounting holes are provided, and mounting blocks are provided on both sides of the arc extinguishing grids. The arc extinguishing grids are installed in the arc extinguishing chamber 4 through the grid mounting holes and mounting blocks that are plugged in and matched.

[0043] In this embodiment, a plurality of arc isolation mounting holes are provided on the mounting plate, and a plurality of arc isolation mounting blocks are respectively provided on the first arc isolation grid 51 and the second arc isolation grid 52. The first arc isolation grid 51 and the second arc isolation grid 52 are installed in the arc extinguishing chamber 4 through arc isolation mounting holes and arc isolation mounting blocks that are plugged in.

[0044] In this embodiment, the short arc-extinguishing grid group includes a plurality of short arc-extinguishing grids 41 .

[0045] like Figure 1 , Figure 2 As shown, the static contact 1 is a U-shaped structure design that can increase the electric repulsion force, and is provided with an arc-starting plate 11 to lead the arc downward, the arc-isolating piece 2 is placed on the upper left end of the static contact 1, and the arc-isolating cover 3 is placed on the upper right end of the static contact 1 and presses the arc-isolating piece 2. The two together can cover the upper surface and side of the static contact 1, thereby improving the insulation effect around the static contact 1, preventing the static contact 1 from being burned by the arc after arcing, and improving the breaking capacity and electrical life of the circuit breaker. Figure 1 , Figure 3As shown, the arc extinguishing chamber 4 is placed above the static contact 1, and at the lower end of the arc extinguishing chamber 4 are some short arc extinguishing grids 41, and the first arc extinguishing grid 51 and the second arc extinguishing grid 52 are mirror-mounted on the inner side of the arc extinguishing chamber 4, and a small magnetizing plate 7 is inserted into the lower end of each of the first arc extinguishing grid 51 and the second arc extinguishing grid 52. The design of the short arc extinguishing grid 41 and the magnetizing plate 7 solves the problem that a conventional arc extinguishing grid cannot be set in the area close to the static contact due to the existence of the arc shield, and at the same time, it has a better magnetizing effect in the local area where the moving and static contacts are in contact, so that the arc leaves the static contact faster and enters the arc extinguishing chamber through the arc striking plate 11. The overall structure of this solution is simple and compact, and it is convenient for production and manufacturing. It can take into account cost control while improving arc extinguishing performance.

[0046] Working principle:

[0047] like Figure 4 As shown, after the moving contact 6 is pushed apart, an arc will be generated between the moving and static contacts. Since small magnetizing plates 7 are placed on both sides of the local contact area between the moving and static contacts, the magnetic attraction force on the arc is increased, and it will quickly move toward the arc extinguishing chamber 4, and be introduced into the lower end of the arc extinguishing chamber under the action of the arc starting plate 11; with the continuous movement of the moving contact, the arc is elongated, and most of the arc enters the arc extinguishing chamber under the action of air blowing and magnetic blowing and is cut into short arcs, and part of the arc is free everywhere, and the arc isolation member 2 and the arc isolation cover 3 cover the upper surface and side of the static contact 1, thereby preventing the static contact 1 from being burned by the arc, thereby improving the breaking capacity and electrical life of the circuit breaker.

[0048] The utility model, through ingenious structural design, achieves all-round insulation protection for the static contact in the narrow space remaining between the static contact and the arc extinguishing chamber, thereby improving the breaking capacity and electrical life of the circuit breaker, and adding a local magnetization structure, thereby saving costs while improving the breaking capacity and electrical life.

[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 system for a molded case circuit breaker, characterized in that: It comprises an arc extinguishing chamber (4), an arc extinguishing grid group, a short arc extinguishing grid group, an arc isolating member (2), an arc isolating cover (3), an arc striking plate (11), and a magnetizing plate (7); The arc extinguishing grid group is arranged in the arc extinguishing chamber (4), and a movable contact clearance space is provided on one side; The stationary contact (1) is U-shaped, with a front end for connecting to a connecting plate and a rear end for contacting with a moving contact (6); A short arc extinguishing grid group is provided between the front and rear ends of the stationary contact (1) and below the arc extinguishing grid group, and the arc striking plate (11) is connected to the rear end of the stationary contact (1) and extends to the lower side of the short arc extinguishing grid group; The arc isolation cover (3) is arranged at the rear end of the stationary contact (1) and is provided with a slot to expose the connection area between the moving and stationary contacts; the arc isolation member (2) covers the stationary contact (1) and extends from the front end to connect with the arc isolation cover (3) to insulate and cover the stationary contact (1); The magnetizing plates (7) are arranged on both sides of the contact area between the moving and static contacts.

2. The arc extinguishing system of the molded case circuit breaker according to claim 1, characterized in that: The arc-extinguishing grid group includes a plurality of arc-extinguishing grids arranged at intervals.

3. The arc extinguishing system of the molded case circuit breaker according to claim 2, characterized in that: A U-shaped slot is provided on one side of the plurality of arc extinguishing grids to form a space for the moving contact to make way.

4. The arc extinguishing system of the molded case circuit breaker according to claim 3, characterized in that: A first arc isolation grid (51) and a second arc isolation grid (52) are respectively arranged on both sides of the movable contact clearance space, and the first arc isolation grid (51) and the second arc isolation grid (52) are covered on the rear end and side wall of the arc extinguishing grid plate group.

5. The arc extinguishing system of the molded case circuit breaker according to claim 4, characterized in that: A plurality of arc isolation plates are provided on the first arc isolation grid (51) and the second arc isolation grid (52), and the arc isolation plates are embedded between adjacent arc extinguishing grid plates.

6. The arc extinguishing system of the molded case circuit breaker according to claim 4, characterized in that: The magnetizing plate (7) is arranged below the arc extinguishing grid group.

7. The arc extinguishing system of the molded case circuit breaker according to claim 6, characterized in that: A magnetizing plate installation groove (512) is provided on the first arc isolation grid (51) and the second arc isolation grid (52) on one side away from the movable contact clearance space, and the magnetizing plate (7) is arranged in the magnetizing plate installation groove (512).

8. The arc extinguishing system of the molded case circuit breaker according to claim 4, characterized in that: The arc extinguishing chamber (4) comprises a mounting plate arranged in parallel, a plurality of grid plate mounting holes are provided on the mounting plate, mounting blocks are provided on both sides of the arc extinguishing grid, and the arc extinguishing grid is installed in the arc extinguishing chamber (4) through the grid plate mounting holes and the mounting blocks that are plugged into each other.

9. The arc extinguishing system of the molded case circuit breaker according to claim 8, characterized in that: The mounting plate is provided with a plurality of arc-isolating mounting holes, the first arc-isolating grid (51) and the second arc-isolating grid (52) are respectively provided with a plurality of arc-isolating mounting blocks, and the first arc-isolating grid (51) and the second arc-isolating grid (52) are installed in the arc-extinguishing chamber (4) through the arc-isolating mounting holes and arc-isolating mounting blocks that are plugged in and matched.

10. The arc extinguishing system of a molded case circuit breaker according to claim 1, characterized in that: The short arc-extinguishing grid group comprises a plurality of short arc-extinguishing grids (41).

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