Arc extinguish chamber of frame circuit breaker

Abstract

The utility model discloses an arc extinguish chamber of a frame circuit breaker, which comprises an arc extinguish chamber and a cover plate fixed at the top end of the arc extinguish chamber, the cover plate is provided with an arc hole for residual arc to pass through, a zero flashover cover is arranged above the arc hole, an inlet of the zero flashover cover is provided with a metal net, and the metal net is provided with a metal wire. A plurality of V-shaped first arc-isolating sheets and second arc-isolating sheets are arranged above the metal net, and the second arc-isolating sheets are arranged between the two first arc-isolating sheets. Small parts are prevented from impacting the first arc-isolating sheets through the metal net, and the multiple first arc-isolating sheets and the multiple second arc-isolating sheets block most high-temperature scorching particles; the first arc-isolating sheet and the second arc-isolating sheet enable high-pressure gas to pass through the air holes at an inclined angle, the advancing distance of the high-pressure gas is prolonged, the advancing distance of the gas is further increased through the staggered air holes, the flow speed of the high-pressure gas is reduced, then residual flashover is rapidly extinguished, and the product has the advantage of preventing the flashover from flying out.

Description

Technical Field

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

[0002] Arc extinguishing chambers are usually used to extinguish the arc generated when the contacts of a circuit breaker are disconnected. The arc extinguishing chamber can guide the arc to the arc extinguishing grid, extinguishing the arc through the arc extinguishing grid, and preventing the arc from staying on the contacts and damaging the circuit breaker.

[0003] When the breaking current is large and the arc energy is high, the arc extinguishing chamber cannot completely and quickly extinguish all arcs. The residual arc will burst out from the air duct of the arc extinguishing chamber. At the same time, the residual arc will gush out with a large amount of hot metal particles, splash onto the circuit breaker baffle, spread to the surroundings, and cause damage to nearby electronic components. Therefore, the applicant has made a useful design and found a solution to the above-mentioned problem. The technical solution to be introduced below was produced in this context. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned traditional frame circuit breaker design and provide a product to prevent arcing.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions.

[0006] An arc extinguishing chamber of a frame circuit breaker includes an arc extinguishing chamber and a cover plate fixed to the top of the arc extinguishing chamber, the cover plate being provided with an arc hole for allowing a residual arc to pass through, a zero arcing cover being provided above the arc hole, a metal mesh being provided at the entrance of the zero arcing cover, a plurality of first arc isolation plates and a second arc isolation plate being provided above the metal mesh, the second arc isolation plate being provided between the two first arc isolation plates, the first arc isolation plates and the second arc isolation plates being provided with a plurality of air holes, and being arranged in an alternating manner.

[0007] Preferably, the zero arcing cover includes a first arc cover and a second arc cover. The outer walls of the first arc cover and the second arc cover are provided with fixing holes, and the fixing holes are provided with bolts to connect and fix the first arc cover and the second arc cover.

[0008] Preferably, the side walls of the first arc cover and the second arc cover are provided with fixing grooves for inserting the first arc isolation piece and the second arc isolation piece.

[0009] Preferably, the bottom of the first arc cover and the second arc cover is provided with a mounting portion, which abuts against the cover plate, and the bottom of the mounting portion is provided with a sealing strip, and the mounting portion is provided with a plurality of screws, which are threadedly connected to the cover plate to press the sealing strip tightly against the cover plate.

[0010] Preferably, a plurality of ventilation holes are provided on the top of the first arc cover and the second arc cover.

[0011] Preferably, an inclined guide portion is provided at the entrance of the arc hole.

[0012] Preferably, a plurality of arc extinguishing grids are provided in the arc extinguishing chamber, and an arc striking plate is also provided in the arc extinguishing chamber.

[0013] Beneficial effects:

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The utility model uses a metal mesh to block small broken parts from impacting the first arc isolation plate, causing damage to the arc isolation plate, and uses multiple first arc isolation plates and second arc isolation plates to block most of the high-temperature hot particles; the first arc isolation plates and the second arc isolation plates with a V-shaped structure force the high-pressure gas generated by the arc to pass through the air holes at an inclined angle, thereby extending the travel distance of the high-pressure gas, and further increasing the travel distance of the gas through the mutually staggered air holes, and reducing the flow rate of the high-pressure gas, thereby quickly extinguishing the residual arc, so that the product has the advantage of preventing arc flying out. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic side cross-sectional structural diagram of an arc extinguishing chamber of a frame circuit breaker of the present invention;

[0017] Figure 2 For this utility model Figure 1 A partial enlarged view of the arc extinguishing chamber of a frame circuit breaker;

[0018] Figure 3 This is an exploded view of an arc extinguishing chamber of a frame circuit breaker of the present invention;

[0019] Figure 4 For this utility model Figure 3 A partial enlarged view of the arc extinguishing chamber of a frame circuit breaker B;

[0020] The corresponding relationship between the labels and component names in the figures is as follows:

[0021] Figure numerals: 1, arc extinguishing chamber; 2, cover plate; 3, zero arcing cover; 4, metal mesh; 5, first arc-isolating plate; 6, second arc-isolating plate; 7, air hole; 8, bolt; 9, screw; 11, arc-extinguishing grid; 12, arc-starting plate; 21, arc hole; 22, guide part; 31, first arc cover; 32, second arc cover; 33, fixing hole; 34, fixing groove; 35, mounting part; 36, sealing strip; 37, air vent. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] In the embodiments of the present invention, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0025] Reference example Figures 1 to 4 A frame circuit breaker arc extinguishing chamber, comprising an arc extinguishing chamber 1, and a cover plate 2 fixed on the top of the arc extinguishing chamber 1, the cover plate 2 is provided with an arc hole 21 for the residual arc to pass through, a zero arcing cover 3 is provided above the arc hole 21, a metal mesh 4 is provided at the entrance of the zero arcing cover 3, a plurality of V-shaped first arc isolation plates 5 and a second arc isolation plate are provided above the metal mesh 4, and the second arc isolation plate 6 is provided between the two first arc isolation plates 5, the first arc isolation plates 5 and the second arc isolation plates 6 are provided with a plurality of air holes 7, and are staggered with each other, and the V-shaped first arc isolation plates 5 and the second arc isolation plates 6 enable them to Withstand greater gas impact, prevent deformation caused by high-pressure gas generated by the arc, block small broken parts from impacting the first arc isolation plate 5 through the metal mesh 4, causing damage to the arc isolation plate, and block most of the high-temperature burning particles through multiple first arc isolation plates 5 and second arc isolation plates 6; the V-shaped first arc isolation plates 5 and second arc isolation plates 6 force the high-pressure gas generated by the arc to pass through the air holes 7 at an inclined angle, extending the travel distance of the high-pressure gas. The interlaced air holes 7 further increase the travel distance of the gas and reduce the flow rate of the high-pressure gas, thereby quickly extinguishing the residual arc.

[0026] It is worth mentioning that the zero arcing cover 3 includes a first arc cover 31 and a second arc cover 32. The outer walls of the first arc cover 31 and the second arc cover 32 are provided with fixing holes 33. The fixing holes 33 are provided with bolts 8 to connect and fix the first arc cover 31 and the second arc cover 32. The split design of the zero arcing cover 3 facilitates the rapid assembly of the first arc isolation plate 5 and the second arc isolation plate 6.

[0027] It is worth mentioning that the side walls of the first arc cover 31 and the second arc cover 32 are provided with fixing grooves 34 for inserting the first arc isolation sheet 5 and the second arc isolation sheet 6. The first arc cover 31 and the second arc isolation sheet 32 ​​are tightly connected by bolts 8 and nuts to fix the first arc isolation sheet 5 and the second arc isolation sheet 6. At the same time, the fixing grooves 34 provide strong support for the first arc isolation sheet 5 and the second arc isolation sheet 6.

[0028] It is worth mentioning that the bottom of the first arc cover 31 and the second arc cover 32 is provided with a mounting portion 35, which abuts the cover plate 2. The bottom of the mounting portion 35 is provided with a sealing strip 36. The mounting portion 35 is provided with a plurality of screws 9 and is threadedly connected to the cover plate 2, pressing the sealing strip 36 tightly against the cover plate 2. The sealing strip 36 increases the sealing between the zero arcing cover 3 and the cover plate 2, preventing gas leakage from the connection gap;

[0029] It is worth mentioning that a plurality of air holes 37 are provided on the top of the first arc cover 31 and the second arc cover 32, and the gas with reduced flow rate is discharged through the air holes 37;

[0030] It is worth mentioning that an inclined guide portion 22 is provided at the entrance of the arc hole 21, and the guide portion 22 guides the high-temperature burning particles and high-pressure gas into the zero arcing cover 3 in an orderly manner;

[0031] It is worth mentioning that a plurality of arc extinguishing grids 11 are provided in the arc extinguishing chamber 1 , and an arc striking plate 12 is also provided in the arc extinguishing chamber 1 . The arc generated at the moment of disconnection between the static contact and the moving contact is guided to the arc extinguishing grid 11 through the guide portion 22 , and the arc is extinguished by the plurality of arc extinguishing grids 11 .

[0032] The above design solution can enable the product to achieve the advantage of preventing arc flashover.

[0033] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as falling within the scope of protection determined by the claims submitted for the present invention.

Claims

1. An arc extinguishing chamber of a frame circuit breaker, comprising an arc extinguishing chamber (1) and a cover plate (2) fixed on the top of the arc extinguishing chamber (1), characterized in that: The cover plate (2) is provided with an arc hole (21) for the residual arc to pass through, a zero arcing cover (3) is provided above the arc hole (21), a metal mesh (4) is provided at the entrance of the zero arcing cover (3), a plurality of V-shaped first arc isolation plates (5) and second arc isolation plates are provided above the metal mesh (4), the second arc isolation plate (6) is provided between the two first arc isolation plates (5), and the first arc isolation plates (5) and the second arc isolation plates (6) are provided with a plurality of air holes (7) which are staggered with each other.

2. The arc extinguishing chamber of the frame circuit breaker according to claim 1, characterized in that: The zero arcing cover (3) comprises a first arc cover (31) and a second arc cover (32). The outer walls of the first arc cover (31) and the second arc cover (32) are provided with fixing holes (33). The fixing holes (33) are provided with bolts (8) to connect and fix the first arc cover (31) and the second arc cover (32).

3. The arc extinguishing chamber of the frame circuit breaker according to claim 2, characterized in that: The side walls of the first arc cover (31) and the second arc cover (32) are provided with fixing grooves (34) for inserting the first arc isolation piece (5) and the second arc isolation piece (6).

4. The arc extinguishing chamber of the frame circuit breaker according to claim 3, characterized in that: The bottom of the first arc cover (31) and the second arc cover (32) is provided with a mounting portion (35) and abuts against the cover plate (2); the bottom of the mounting portion (35) is provided with a sealing strip (36); the mounting portion (35) is provided with a plurality of screws (9) and is threadedly connected to the cover plate (2), pressing the sealing strip (36) tightly against the cover plate (2).

5. The arc extinguishing chamber of the frame circuit breaker according to claim 4, characterized in that: A plurality of air holes (37) are provided on the tops of the first arc cover (31) and the second arc cover (32).

6. The arc extinguishing chamber of the frame circuit breaker according to claim 1, characterized in that: An inclined guide portion (22) is provided at the entrance of the arc hole (21).

7. The arc extinguishing chamber of the frame circuit breaker according to claim 1, characterized in that: A plurality of arc extinguishing grids (11) are provided in the arc extinguishing chamber (1), and an arc striking plate (12) is also provided in the arc extinguishing chamber (1).

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