Arc extinguishing device of circuit breaker

Abstract

An arc extinguishing device of a circuit breaker belongs to the technical field of low-voltage apparatuses. The circuit breaker comprises a shell and an arc extinguishing device installed in the shell, the arc extinguishing device comprises an arc extinguishing chamber, arc isolating covers and a magnetism increasing sheet, the arc extinguishing chamber comprises a pair of side plates arranged face to face and arc extinguishing grid sheets arranged between the pair of side plates in a spaced state, the number of the arc isolating covers is a pair, the arc isolating covers are arranged on the pair of side plates respectively, and the magnetism increasing sheet is arranged between the arc extinguishing grid sheets. An accommodating cavity with an opening facing one side of the arc extinguishing grid sheet is formed at the bottom of the arc isolating cover, the magnetic increasing sheet is mounted in the accommodating cavity, the arc extinguishing device further comprises a baffle plate, the baffle plate is positioned at the bottom of the magnetic increasing sheet, and the baffle plate and the arc isolating cover are assembled in a matched manner to wrap the magnetic increasing sheet so as to prevent the magnetic increasing sheet from falling off from the arc isolating cover. The utility model has the advantages that the arc extinguish chamber is not easy to damage in the breaking process, and the reliability of the breaking process and after-test performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low voltage electrical apparatus technical field, and specifically relates to an arc extinguishing device of circuit breaker. BACKGROUND

[0002] The circuit breaker is used for breaking fault current, and the arc extinguishing device is a main component of the circuit breaker. In order to make the arc extinguish quickly after the arc is generated between the contacts, the arc is usually extinguished by increasing the arc voltage. The conventional scheme is to cut the arc by using the metal arc extinguishing grid, so as to realize arc extinguishing. Meanwhile, some circuit breakers on the market have the functions of gas blowing arc extinguishing or magnetic blowing arc extinguishing. A conventional method of magnetic blowing arc extinguishing is to extend the legs of the arc extinguishing grid to the two sides of the moving guide rod to form the magnetic blowing effect, and the legs of the arc extinguishing grid are covered with the gas generating material. This structure avoids the breakdown of the legs of the arc extinguishing grid and the moving guide rod, and the gas blowing is generated by the contact between the gas generating material and the arc, so that the arc can quickly enter the cutting area of the arc extinguishing grid. However, with the demand for high breaking capacity under high voltage in new energy application occasions, the energy of the breaking arc is higher and higher, and the energy borne by the arc extinguishing grid is also higher and higher. In the original arc extinguishing chamber structure, the heat absorbed by the arc extinguishing grid is continuously conducted to the gas generating material due to the cooperation between the gas generating material and the legs of the arc extinguishing grid. The gas generating material is usually a thermoplastic material such as nylon. After multiple breaking, the gas generating material is often deformed due to high-temperature heating, and then the arc extinguishing chamber is damaged, which affects the post-test performance of the circuit breaker.

[0003] In view of the above prior art, the applicant has made beneficial design, and the existing arc extinguishing device has been improved. The technical scheme to be introduced below is generated in this background. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing an arc extinguishing device of circuit breaker, which is not easy to be damaged in the breaking process, and improves the reliability of the breaking process and post-test performance.

[0005] The utility model aims at providing an arc extinguishing device of circuit breaker, which is not easy to be damaged in the breaking process, and improves the reliability of the breaking process and post-test performance.

[0006] In one specific embodiment of the utility model, the upper side of both ends of side plate is provided with arc baffle mounting hole respectively, the two sides of arc baffle in the length direction of accommodating cavity are formed with the mounting boss corresponding with arc baffle mounting hole, and a pair of arc baffles are symmetrically arranged in the inner side of a pair of side plates through the cooperation of mounting boss and arc baffle mounting hole.

[0007] In another specific embodiment of the utility model, the baffle comprises a cuboid baffle body, the baffle body is bent and extended at both ends in the length direction to form mounting end, the arc baffle is provided with mounting portion on both sides of the length direction of the opening of accommodating cavity, and the baffle is mounted on the arc baffle through the cooperation of mounting end and mounting portion.

[0008] In still another specific embodiment of the utility model, the mounting portion is a slot or boss, and the mounting end is a boss or slot corresponding with the mounting portion.

[0009] In still another specific embodiment of the utility model, the circuit breaker further comprises a movable contact system and a bracket device, the movable contact system is located above the housing, and the bracket device is arranged between the movable contact system and the arc extinguishing device to separate the movable contact system from the arc extinguishing device.

[0010] In still another specific embodiment of the utility model, the bracket device comprises a bracket body and an arc extinguishing plate, and the arc extinguishing plate is connected to the bracket body through clamping.

[0011] In still another specific embodiment of the utility model, the arc baffle and the baffle are gas generating material pieces.

[0012] In still another specific embodiment of the utility model, the gas generating material is nylon.

[0013] The utility model discloses the arc baffle and the baffle are gas generating material pieces. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the explosion schematic drawing of utility model;

[0015] Figure 2 It is the assembly schematic drawing of utility model;

[0016] Figure 3 It is the assembly explosion schematic drawing of the contact system, bracket device and arc extinguishing device of utility model;

[0017] Figure 4 The structure schematic view of the arc separation cover;

[0018] Figure 5 The structure schematic view of the baffle plate;

[0019] Figure 6 The structure schematic view of the arc extinguishing plate;

[0020] Figure 7 The general assembly sectional view of the utility model.

[0021] In the figure: 1. shell, 10. arc extinguishing device, 11. upper base, 12. lower base; 2. arc extinguishing chamber, 21. side plate, 211. arc separation cover mounting hole, 22. arc extinguishing grid; 3. arc separation cover, 31. accommodating cavity, 32. mounting portion, 33. mounting boss; 4. magnetic enhancement sheet; 5. baffle plate, 51. baffle plate body, 52. mounting end, 53. vertical rib; 6. movable contact system, 61. movable contact, 62. rotating shaft; 7. support device, 71. support body, 72. arc extinguishing plate, 721. buckle; 8. stationary contact. DETAILED DESCRIPTION

[0022] The specific embodiments of the utility model are described in detail below in combination with the drawings, but the description of the embodiments is not the limitation of the technical scheme, and any change in form but not in substance according to the concept of the utility model should be regarded as the protection scope of the utility model.

[0023] In the following description, the concepts of directionality (or directionality) such as up, down, left, right, front and back are all for the position state of the figure being described, and the purpose is to facilitate the public to understand, so it cannot be understood as the special limitation of the technical scheme provided by the utility model.

[0024] Please refer to Figures 1 to 4 And Figure 7, show an arc extinguishing device of a circuit breaker, the circuit breaker includes a housing 1, a moving contact system 6, a support device 7, a static contact 8 and an arc extinguishing device 10, the housing 1 includes an upper base 11 and a lower base 12 which is in upper and lower interface with the upper base 11. The moving contact system 6 is arranged in the upper base 11, the arc extinguishing device 10 is arranged in the lower base 12, the support device 7 is arranged between the moving contact system 6 and the arc extinguishing device 10, which separates the moving contact system 6 and the arc extinguishing device 10. The moving contact system 6 includes a moving contact 61 and a rotating shaft 62, the rotating shaft 62 is arranged in the upper base 11 in the state of being supported on the support device 7 and is connected with a circuit breaker operating mechanism arranged outside the upper base 11, the upper end of the moving contact 61 is pivoted on the rotating shaft 62, the lower end of the moving contact 61 extends below the support device 7 through the support device 7 and is in contact or separated from the static contact 8 with the rotating of the circuit breaker operating mechanism. The moving contact system 6 is rotated with the operating mechanism and is in contact or separated from the static contact 8 through the support device 7. The arc extinguishing device 10 includes an arc extinguishing chamber 2, an arc separation cover 3 and a magnetic enhancement sheet 4, the arc extinguishing chamber 2 includes a pair of side plates 21 arranged face to face and an arc extinguishing grid 22 arranged in a spaced state between the pair of side plates 21. The arc separation cover 3 is a pair, which is separately arranged on the pair of side plates 21. The arc separation cover 3 is provided with a containing cavity 31 which is opened to the side of the arc extinguishing grid 22 at the bottom, the magnetic enhancement sheet 4 is installed in the containing cavity 31, and the shape of the containing cavity 31 is designed according to the shape of the magnetic enhancement sheet 4.

[0025] As the improved technical points of the utility model: the arc extinguishing device 10 further includes a baffle 5, the baffle 5 is located at the bottom of the magnetic enhancement sheet 4, and is assembled with the arc separation cover 3 to coat the magnetic enhancement sheet 4 and prevent the magnetic enhancement sheet 4 from falling off the arc separation cover 3. In the embodiment, the arc separation cover 3 and the baffle 5 are made of a gas generating material, and the gas generating material includes but is not limited to nylon and the like.

[0026] Please refer to Figure 1 , Figure 2 and Figure 4 , specifically, the side plate 21 is provided with an arc separation cover mounting hole 211 on the upper side of both ends, respectively, the arc separation cover 3 is formed with an installation boss 33 corresponding to the arc separation cover mounting hole 211 on the side plate 21 on both sides of the length direction of the containing cavity 31, and a pair of arc separation covers 3 are symmetrically arranged on the inner side of the pair of side plates 21 through the cooperation of the installation boss 33 and the arc separation cover mounting hole 211. Preferably, the arc separation cover mounting hole 211 is a circular hole, and the installation boss 33 is a circular boss, of course, the arc separation cover mounting hole 211 can also be a rectangular hole or a rhombic square hole, and the installation boss 33 is a corresponding rectangular boss or a rhombic boss.

[0027] Further, seeFigure 1 , Figure 4 and Figure 5 The baffle 5 includes a cuboid baffle body 51, which is bent and extended at both ends along its length to form mounting ends 52. The arc-blocking cover 3 has mounting portions 32 on both sides of the opening of the receiving cavity 31 along its length. The baffle 5 is mounted to the arc-blocking cover 3 through the cooperation of the mounting ends 52 and the mounting portions 32. Specifically, the mounting portion 32 is a slot or a boss, and the mounting end 52 is a boss or slot corresponding to the mounting portion 32. The baffle body 51 has at least one vertical rib 53 in the middle of the side facing the arc-blocking cover 3. The vertical rib 53 is installed in a staggered manner with the mounting cavity 31. The vertical rib 53 has a wedge-shaped structure, and the beveled design allows the baffle 5 to be easily deformed and inserted into the arc-blocking cover 3. The vertical rib 53 deforms and recovers after the baffle 5 is installed in place, which can prevent the baffle 5 from detaching from the arc-extinguishing cover 3 towards the arc-extinguishing grid plate 22. At the same time, the baffle body 51 is attached to the side of the side plate 21 near the arc-extinguishing grid plate 22, preventing the baffle 5 from detaching from the side plate 21 away from the arc-extinguishing grid plate 22.

[0028] See Figure 3 and Figure 6 The support device 7 includes a support body 71 and an arc-extinguishing plate 72, and the arc-extinguishing plate 72 is connected to the support body 71 by a snap fastener 721.

[0029] In this embodiment, after the baffle 5 is installed in place, it seals the receiving cavity 31 of the arc-isolating cover 3, preventing the magnetizing sheet 4 from detaching from the arc-isolating cover 3. The arc-isolating cover 3 and the baffle 5 cover the magnetizing sheet 4, isolating it from the arc-extinguishing chamber 2, thereby effectively preventing damage to the arc-extinguishing chamber 2 and improving the reliability of the circuit breaker's breaking process and post-test performance.

Claims

1. An arc extinguishing device of a circuit breaker, the circuit breaker comprising a housing (1) and an arc extinguishing device (10) installed in the housing (1), the arc extinguishing device (10) comprising an arc extinguishing chamber (2), arc shields (3) and a magnetic enhancer (4), the arc extinguishing chamber (2) comprising a pair of side plates (21) disposed face to face with each other and a plurality of arc extinguishing vanes (22) disposed in a spaced apart state between the pair of side plates (21), the arc shields (3) being provided in a pair and disposed separately on the pair of side plates (21), the arc shields (3) being formed at a bottom portion thereof with receiving cavities (31) opened toward one side of the arc extinguishing vanes (22), the magnetic enhancer (4) being installed in the receiving cavities (31), characterized in that, The arc extinguishing device (10) further comprises a baffle (5) located at the bottom of the magnetic sheet (4) and matched with the arc shield (3) to cover the magnetic sheet (4) and prevent the magnetic sheet (4) from falling off the arc shield (3).

2. An arc chute for a circuit breaker according to claim 1, characterized in that: The side plates (21) are respectively provided with arc shield mounting holes (211) at the upper sides of the two ends, the arc shields (3) are respectively provided with mounting bosses (33) corresponding to the arc shield mounting holes (211) at the two sides in the length direction of the accommodating cavities (31), and a pair of arc shields (3) are symmetrically arranged on the inner sides of the pair of side plates (21) through the mounting bosses (33) and the arc shield mounting holes (211).

3. An arc chute for a circuit breaker according to claim 1, wherein: The baffle (5) comprises a baffle body (51) in the shape of a cuboid, the baffle body (51) is bent and extended at the two ends in the length direction to form mounting ends (52), the arc shields (3) are respectively provided with mounting portions (32) at the two sides in the length direction of the openings of the accommodating cavities (31), and the baffle (5) is mounted on the arc shields (3) through the mounting ends (52) and the mounting portions (32).

4. An arc chute for a circuit breaker according to claim 3, wherein: The mounting portions (32) are slots or bosses, and the mounting ends (52) are bosses or slots corresponding to the mounting portions (32).

5. An arc chute for a circuit breaker according to claim 1, wherein: The circuit breaker further comprises a moving contact system (6) located above the housing (1) and a support device (7) arranged between the moving contact system (6) and the arc extinguishing device (10) to separate the moving contact system (6) from the arc extinguishing device (10).

6. An arc chute for a circuit breaker according to claim 5 wherein: The support device (7) comprises a support body (71) and an arc extinguishing plate (72) connected to the support body (71) through clamping.

7. An arc chute for a circuit breaker according to claim 1, wherein: The arc shields (3) and the baffle (5) are made of a gas generating material.

8. An arc chute for a circuit breaker according to claim 7, wherein: The gas generating material is nylon.

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