Arc extinguishing system of circuit breaker

Abstract

An arc extinguishing system of a circuit breaker comprises an arc extinguishing chamber; the static contact assembly is arranged at the lower end of the arc extinguish chamber, the static contact assembly comprises a static contact, the static contact is composed of a front end U-shaped part 210 and a tail connecting part, the upper end face of the front end U-shaped part is provided with a static contact point, the tail connecting part is provided with an arc striking angle, and the arc striking angle is arranged towards the static contact point. Through the technical scheme of increasing magnetic field arc striking, arc extinguishing grid sheet equidistant arc striking, air blowing arc blowing and the like, the arc can quickly move to the arc extinguishing device, and the arc extinguishing effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to an arc extinguishing system for a circuit breaker. Background Technology

[0002] When the circuit breaker opens, i.e., when the moving and stationary contacts separate, an electric arc is generated. Under the action of electrodynamic force, the arc enters the arc-extinguishing grid, which cuts the arc into a series of short arcs connected in series, making the arc thinner and rapidly increasing the arc voltage, thereby achieving the purpose of arc extinguishing. At the same time, an arc-extinguishing hood made of gas-generating material is installed in the arc-extinguishing chamber. When the circuit breaker opens, the arc-extinguishing hood is eroded by the electric arc, generating high-pressure gas inside the arc-extinguishing chamber, forming a gas blow, which drives the arc rapidly into the arc-extinguishing grid.

[0003] Existing contact arc extinguishing systems mainly consist of a stationary contact, an arc extinguishing chamber, and a moving contact structure. The arc extinguishing principle is as follows: the moving contact and the stationary contact quickly separate, elongating the arc; the arc enters the arc extinguishing device under the action of electrodynamic force; the arc extinguishing grid inside the arc extinguishing device divides the arc and forms short arcs in series; the arc extinguishing grid cools and extinguishes the arc.

[0004] The electric arc enters the arc-extinguishing device only under the action of electrodynamic force, which has the problem of slow arc movement speed, thus limiting the arc extinguishing effect. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an arc extinguishing system for circuit breakers.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An arc-extinguishing system for a circuit breaker, comprising:

[0008] Arc-extinguishing chamber;

[0009] A stationary contact assembly is provided at the lower end of the arc-extinguishing chamber. The stationary contact assembly includes a stationary contact, which consists of a front U-shaped part 210 and a rear connecting part. The upper surface of the front U-shaped part is provided with a stationary contact point, and the rear connecting part is provided with an arc-inducing angle, which is oriented towards the stationary contact point.

[0010] The upper end of the arc-starting angle is flush with the welding surface of the stationary contact.

[0011] The distance between the front end of the arc-drawing angle and the stationary contact is 1-2mm.

[0012] The arc-leading angle side is riveted to the tail connection part by an L-shaped connector.

[0013] A magnetizing block is provided in the middle of the front U-shaped section.

[0014] The lower end face of the front U-shaped part is provided with a positioning groove for fixing the magnetizing block.

[0015] The arc-extinguishing chamber includes a pair of oppositely arranged side plates, a plurality of arc-extinguishing grids spaced between the two side plates in the vertical direction, and an arc-extinguishing cover at the front end of the arc-extinguishing chamber. The arc-extinguishing cover includes two oppositely arranged arc-extinguishing side plates, a stationary contact protection cover at the bottom of the arc-extinguishing side plates, and an arc-extinguishing top plate at the top of the two arc-extinguishing side plates, and the arc-extinguishing top plate closes the upper opening of the arc-extinguishing chamber.

[0016] The bottom of the arc-extinguishing side plate is provided with a slot for placing a magnetizing sheet.

[0017] The arc-extinguishing grid is divided into two groups: one group consists of multiple overlapping long arc-extinguishing grids, and the other group consists of multiple overlapping short arc-extinguishing grids. The short arc-extinguishing grids are positioned between the arc-initiating angle and the long arc-extinguishing grids.

[0018] An arc-inducing plate is provided between the arc-extinguishing grid plate and the arc-extinguishing top plate.

[0019] The beneficial effects of this invention are as follows: By rapidly igniting the arc at an upward equipotential angle, space is created at the upper end of the arc ignition angle, allowing for an increase in the number and arrangement of arc-extinguishing chamber grid plates. Increasing the number of arc-extinguishing chamber grid plates improves the arc-extinguishing effect. By incorporating techniques such as magnetic field arc ignition, equidistant arc ignition of the arc-extinguishing grid plates, and air blowing arc extinguishing, the rapid movement of the arc to the arc-extinguishing device is enhanced, thus improving the arc-extinguishing effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0022] Figure 3 This is a schematic diagram of the installation of the arc-leading angle and the stationary contact of this utility model.

[0023] Figure 4 This is a schematic diagram of the arc-extinguishing chamber of this utility model.

[0024] Figure 5 This is a schematic diagram showing the cooperation between the magnetizing block and the magnetizing sheet of this utility model.

[0025] Figure 6 This is a cross-sectional schematic diagram of the arc-extinguishing chamber of this utility model.

[0026] Figure 7 This is a schematic diagram of the arc-extinguishing cover of this utility model.

[0027] Figure 8 This is a cross-sectional view of the arc-extinguishing chamber of this utility model from another direction. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] like Figure 1 As shown, this utility model discloses an arc extinguishing system for a circuit breaker, which includes an arc extinguishing chamber 100 and a stationary contact assembly disposed below the arc extinguishing chamber, while the stationary contact assembly blocks the lower opening of the arc extinguishing chamber.

[0031] like Figure 2 As shown, the stationary contact assembly 200 includes a stationary contact, which consists of a front U-shaped portion 210 and a rear connecting portion 220. The front U-shaped portion is divided into an upper end face and a lower end face, which are arranged in parallel. The lower end face is connected to the rear connecting portion. The upper end face of the front U-shaped portion 210 is provided with a stationary contact 230, which is a silver contact and is welded and fixed to the front U-shaped portion 210. The rear connecting portion 220 is provided with an arc-starting angle 400, which is oriented towards the stationary contact 230.

[0032] Meanwhile, the upper end of the arc-starting angle 400 is flush with the welding surface of the stationary contact 230, and the arc generated on the stationary contact is started by using equipotentiality, which increases the arc-starting effect in the initial stage of the arc and the effect of cutting and breaking the arc.

[0033] The distance between the front end of the arc-initiating angle 400 and the stationary contact 230 is 1-2mm, which is as close as possible to the stationary contact, thereby enabling faster arc initiation.

[0034] For ease of processing, the arc-starting angle 40° side is riveted to the tail connecting part 220 via an L-shaped connector 410. Specifically, a riveting groove is provided on the tail connecting part 220, and the L-shaped connector 410 is riveted into this groove, improving processing efficiency. Figure 3 As shown.

[0035] like Figure 1As shown, the rear end of the arc-extinguishing chamber is provided with a partition plate, the partition plate is provided with several air outlets, and insulating paper is provided on its rear side. The insulating paper 500 partially enters the arc-extinguishing chamber, covers the rear end connection part 220, and extends to the upper end of the arc-starting angle, thus playing an insulating role inside.

[0036] A magnetizing block 300 is provided in the middle of the front U-shaped portion 210, and a positioning groove 240 for fixing the magnetizing block 300 is provided on the lower end surface of the front U-shaped portion 210. The design of the positioning groove facilitates the installation of the magnetizing block. The presence of the magnetizing block can cooperate with the magnetizing sheet inside the arc-extinguishing shroud to form a U-shaped magnetic field, such as... Figure 5 As shown, the electric arc is rapidly introduced into the arc-extinguishing chamber by a magnetic field.

[0037] like Figure 4 As shown, the arc-extinguishing chamber 100 includes a pair of opposing side plates 110, a plurality of arc-extinguishing grids spaced vertically between the two side plates 110, and an arc-extinguishing cover 150 disposed at the front end of the arc-extinguishing chamber. The arc-extinguishing cover 150 includes two opposing arc-extinguishing side plates 151, a stationary contact protection cover 152 disposed at the bottom of the arc-extinguishing side plates 151, and an arc-extinguishing top plate 153 disposed at the top of the two arc-extinguishing side plates 151. The arc-extinguishing top plate 153 closes the upper opening of the arc-extinguishing chamber 100. Figure 7 As shown.

[0038] The stationary contact protection cover seals the lower end of the arc-extinguishing cover, protecting the stationary contact from arc transfer and burning when the stationary contact breaks, thus reducing the actual opening distance of the contact.

[0039] The design of the arc-extinguishing top plate is beneficial for storing gas pressure in the arc-extinguishing chamber.

[0040] like Figure 6 and Figure 8 As shown, the side plate 754 of the arc-extinguishing cover wraps around the long arc-extinguishing grid plate 120. The arc-extinguishing cover is fixed by the arc-extinguishing grid plate 120 to prevent the two sides of the arc-extinguishing cover from shrinking towards the middle (see the direction of shrinkage). Figure 6 (Middle arrow), stuck moving contact.

[0041] The bottom of the arc-extinguishing side plate 151 is provided with a slot for placing the magnetizing sheet 600. The magnetizing sheet can be made of iron chips. Iron chips are set inside the two sides of the lower end of the arc-extinguishing cover. Together with the magnetizing block of the stationary contact, they form a U-shaped magnetic field structure. By increasing the magnetic field to induce arc, the speed at which the arc enters the arc-extinguishing chamber is rapidly increased, thereby improving the product's breaking capacity.

[0042] The arc-extinguishing grids are divided into two groups: one group consists of multiple overlapping long arc-extinguishing grids 120, and the other group consists of multiple overlapping short arc-extinguishing grids 130. The short arc-extinguishing grids 130 are positioned between the arc-starting angle 40° and the long arc-extinguishing grids 120. The short arc-extinguishing chamber grids are positioned within the space provided by the arc-starting angle; specifically, three 2.0mm thick arc-starting plates are designed on the arc-extinguishing chamber above the arc-starting angle to enhance the arc-starting effect and cut off the arc in the initial stage. The long arc-extinguishing grids are arranged in a fan shape along the height direction, ensuring that the distance between each arc-extinguishing grid and the moving contact blade during disconnection and rotation is equidistant, thus ensuring the arc-starting effect. An arc-starting plate 140 is arranged at the top of the arc-extinguishing chamber to ensure that the arc is completely introduced into the arc-extinguishing chamber after the moving contact blade disconnects.

[0043] In addition to its arc-initiating effect, the short arc-extinguishing grid also serves to divide the electric arc into multiple segments (see...). Figure 2 (Schematic diagram of arc ignition direction in the middle of the electric arc) Increasing the arc voltage is beneficial for quickly extinguishing the arc and improving breaking capacity.

[0044] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. An arc-extinguishing system for a circuit breaker, characterized in that: It includes: Arc extinguishing chamber (100); A stationary contact assembly (200) is provided at the lower end of the arc-extinguishing chamber (100). The stationary contact assembly (200) includes a stationary contact, which consists of a front U-shaped part (210) and a rear connecting part (220). A stationary contact point (230) is provided on the upper surface of the front U-shaped part (210), and an arc-inducing angle (400) is provided at the rear connecting part (220), and the arc-inducing angle (400) is set toward the stationary contact point (230).

2. The arc extinguishing system for a circuit breaker according to claim 1, characterized in that: The upper end of the arc-starting angle (400) is flush with the welding surface of the stationary contact (230).

3. The arc extinguishing system for a circuit breaker according to claim 1 or 2, characterized in that: The distance between the front end of the arc-drawing angle (400) and the stationary contact (230) is 1-2 mm.

4. The arc extinguishing system for a circuit breaker according to claim 3, characterized in that: The arc-leading angle (400) is riveted to the tail connector (220) by an L-shaped connector (410).

5. The arc extinguishing system for a circuit breaker according to claim 1, characterized in that: A magnetizing block (300) is provided in the middle of the front U-shaped part (210).

6. The arc extinguishing system for a circuit breaker according to claim 5, characterized in that: The lower end face of the front U-shaped part (210) is provided with a positioning groove (240) for fixing the magnetizing block (300).

7. The arc extinguishing system for a circuit breaker according to claim 1, characterized in that: The arc-extinguishing chamber (100) includes a pair of side plates (110) arranged opposite to each other, a plurality of arc-extinguishing grids arranged at intervals between the two side plates (110) in the vertical direction, and an arc-extinguishing cover (150) arranged at the front end of the arc-extinguishing chamber. The arc-extinguishing cover (150) includes two arc-extinguishing side plates (151) arranged opposite to each other, a stationary contact protection cover (152) arranged at the bottom of the arc-extinguishing side plates (151), and an arc-extinguishing top plate (153) arranged at the top of the two arc-extinguishing side plates (151). The arc-extinguishing top plate (153) closes the upper opening of the arc-extinguishing chamber (100).

8. The arc extinguishing system for a circuit breaker according to claim 7, characterized in that: The bottom of the arc-extinguishing side plate (151) is provided with a slot for placing a magnetizing sheet (600).

9. The arc extinguishing system for a circuit breaker according to claim 7, characterized in that: The arc-extinguishing grid is divided into two groups: one group consists of multiple overlapping long arc-extinguishing grids (120), and the other group consists of multiple overlapping short arc-extinguishing grids (130). The short arc-extinguishing grids (130) are arranged between the arc-starting angle (400) and the long arc-extinguishing grids (120).

10. The arc extinguishing system for a circuit breaker according to claim 7, characterized in that: An arc-inducing plate (140) is provided between the arc-extinguishing grid plate and the arc-extinguishing top plate (153).

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