A magnet assembly for an arc extinguishing chamber

Abstract

The utility model belongs to the low -voltage electrical apparatus arc extinguishing technical field, especially point to a magnet assembly for arc extinguishing chamber, be located in circuit breaker, it is including: magnet shell, including opposite setting and having the first casing and second casing of internal cavity, the bottom of first casing and second casing is equipped with the insertion port that communicates with internal cavity, magnet, can be installed in internal cavity through insertion port, locking cover plate, it is movably set up at insertion port, it is used for after magnet installs in internal cavity can operate to lock magnet in the internal cavity of magnet shell. The utility model through above -mentioned design scheme will magnet completely package in the inside of insulating shell, has isolated electric arc pollution to the maximum extent, has improved the anti -pollution and anti -electricity -leakage performance.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical arc extinguishing technology, and specifically refers to a magnet assembly used in an arc extinguishing chamber. Background Technology

[0002] A circuit breaker is a protective device used to interrupt current in the event of a circuit fault. Its internal arc-extinguishing chamber is responsible for quickly extinguishing the electric arc generated during the interruption to prevent equipment damage and safety accidents. The performance of the arc-extinguishing chamber directly determines the breaking reliability and service life of the circuit breaker.

[0003] Currently, common arc-extinguishing chamber structures expose the magnet within the arc-extinguishing cavity to achieve the function of magnetic field arc blowing. However, metal vapor and conductive ions generated under the action of the arc easily adhere to the exposed surface of the magnet, forming a conductive contamination layer. This reduces the insulation performance of the magnet and leads to harmful surface leakage current, thereby weakening the strength of the arc-extinguishing magnetic field and affecting the long-term operational stability and safety of the circuit breaker. Therefore, there is an urgent need for an arc-extinguishing chamber magnet assembly structure that can effectively seal and isolate the magnet to prevent surface contamination. Utility Model Content

[0004] This invention solves the problems mentioned in the background art by employing a magnet shell formed by a first shell and a second shell arranged opposite to each other, a magnet insertion port located at the bottom of the shell, and a locking cover plate movably disposed at the insertion port, so as to completely encapsulate and lock the magnet inside the shell after it is inserted from the bottom.

[0005] The purpose of this utility model is achieved as follows: a magnet assembly for an arc-extinguishing chamber, disposed within a circuit breaker, includes: The magnet housing includes a first housing and a second housing disposed opposite to each other and having an internal cavity, wherein the bottom of the first housing and the second housing are provided with an insertion port communicating with the internal cavity; The magnet can be installed in the internal cavity through the insertion port; A locking cover plate is movably disposed at the insertion port, which is operable to lock the magnet in the internal cavity of the magnet housing after the magnet is installed in the internal cavity.

[0006] The present invention is further configured such that the inner edge of the insertion port has two opposing elastic sealing sheets, and the two elastic sealing sheets are in close contact with the outer surface of the magnet after the magnet is installed.

[0007] The present invention is further configured such that the locking cover is connected to the magnet housing via a hinge shaft.

[0008] The present invention is further configured to include a grid plate fixing plate, wherein the grid plate fixing plate is respectively disposed on the opposing inner sides of the first housing and the second housing.

[0009] The present invention is further configured to include a plurality of arc-extinguishing grid plates, which are arranged between the grid plate fixing plates on both sides.

[0010] The present invention is further configured such that the extending direction of the arc-extinguishing grid plate is inclined relative to the side wall of the magnet shell.

[0011] The present invention is further configured to include a top plate, which is detachably connected to the top of the first housing and the second housing and covers the top area of ​​the grid fixing plate. The top plate is provided with a plurality of pressure relief holes.

[0012] The present invention is further configured as follows: an arc-extinguishing chamber, comprising a magnet assembly for an arc-extinguishing chamber as described in any of the preceding claims.

[0013] By adopting the above technical solution, the beneficial effects that this utility model can achieve are: 1. By combining the split outer shell with the bottom locking cover, the magnet is completely encapsulated inside the insulating shell, and the bottom surface contact is controlled only by the elastic sealing sheet, which isolates arc pollution to the greatest extent and improves the anti-pollution and anti-leakage performance.

[0014] 2. The combination of bottom insertion installation and detachable top plate allows for magnet loading and unloading and arc-extinguishing chamber top maintenance without disassembling the entire structure, enabling rapid maintenance and replacement and improving assembly convenience and maintainability.

[0015] 3. By combining the inclined arc-extinguishing grid with the integrated grid fixing plate, the path and cutting angle of the electric arc entering the grid are optimized. At the same time, the pressure relief hole at the top ensures the rapid passage of arc gas, thereby improving the efficiency and stability of arc extinguishing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circuit breaker structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the arc-extinguishing chamber of this utility model; Figure 3 This is a utility model Figure 2 Top view; Figure 4 This is a utility model Figure 3 Schematic diagram of the first cross-sectional structure at point AA; Figure 5 This is a utility model Figure 3 Schematic diagram of the second cross-section structure at point AA.

[0017] The attached figures are labeled as follows: 1. Magnet shell; 10. First shell; 11. Second shell; 2. Insertion port; 3. Magnet; 4. Internal cavity; 5. Locking cover plate; 6. Elastic sealing sheet; 7. Hinge shaft; 8. Grid plate fixing plate; 9. Arc extinguishing grid plate; 12. Top plate; 13. Pressure relief hole. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-5 : Example 1:

[0019] This embodiment provides a magnet assembly for an arc-extinguishing chamber, disposed within a circuit breaker, comprising: The magnet housing 1 includes a first housing 10 and a second housing 11 arranged opposite to each other and having an internal cavity 4. The bottom of the first housing 10 and the second housing 11 is provided with an insertion port 2 communicating with the internal cavity 4. The magnet 3 can be installed in the internal cavity 4 through the insertion port 2; A locking cover 5 is movably disposed at the insertion port 2, which is operable to lock the magnet 3 in the internal cavity 4 of the magnet housing 1 after the magnet 3 is installed in the internal cavity 4.

[0020] The magnet housing 1 provides a containment space for the magnet 3, isolating it from the external environment. Structurally, this housing consists of two independent components, a first housing 10 and a second housing 11, which are assembled in a relatively opposite manner to enclose a closed or semi-closed internal cavity 4. These two housings are typically symmetrical in shape and are mostly plate-shaped or box-shaped components made of plastic through injection molding. They can be connected and fixed to each other at the edges using snaps, screws, or other means to form a single unit.

[0021] Both the first housing 10 and the second housing 11 are semi-enclosed housing structures with pre-formed cavities inside. The insertion port 2 communicates with the cavity and serves as a channel for the magnet 3 to be inserted from outside the assembly into its internal cavity 4. It is located at the bottom of the magnet housing 1.

[0022] Magnet 3 is used to generate a magnetic field to guide an electric arc. It is a block of permanent magnet material whose shape is adapted to the cavity of the magnet shell 1. During installation, magnet 3 enters from the insertion port 2 at the bottom of the first shell 10 and the second shell, respectively, and is finally accommodated in the cavity of the first shell 10 and the second shell 11.

[0023] The locking cover 5 is used to close the bottom insertion port 2 after the magnet 3 is installed in place, and to prevent the magnet 3 from detaching from the opening in the opposite direction. It is a separate plate-like part that is movably connected to the housing near the insertion port 2. After installation, the cover is operated to cover and lock the insertion port 2.

[0024] The locking cover 5 is connected to the magnet housing 1 via a hinge shaft 7. The purpose of this design is to allow the cover to rotate and open around a fixed axis by using the hinge shaft 7 as the specific connection between the locking cover 5 and the magnet housing 1. Both ends of the hinge shaft 7 are fixed in corresponding shaft holes at the bottom of the first housing 10 and the second housing 11, allowing the locking cover 5 to rotate between the open and closed positions around this axis. When closed, the latches on the cover engage with the slots on the housing to lock it in place. The opening and closing action of the cover is simplified to a single rotational movement, eliminating the need to completely disassemble it from the housing. This avoids the need for separate storage of small parts and ensures that the cover reliably resets and covers the insertion port 2 when closed. Simultaneously, the hinge structure provides stable rotational support for the cover, enabling it to withstand a certain reverse force when locking the magnet 3.

[0025] The inner edge of the insertion port 2 has two opposing elastic sealing sheets 6, which are in close contact with the outer surface of the magnet 3 after the magnet 3 is installed. The purpose of this design is to connect the two opposing, sheet-like elastic sealing sheets 6 on the inner edge of the insertion port 2 using adhesives or other methods, forming a pair of elastically deformable sealing lips. The two sealing sheets are parallel to and opposite the outer surface of the magnet 3. During the installation of the magnet 3, their inner edges are compressed by the magnet 3 and open to both sides, thus forming a tight line or surface contact with the surface of the magnet 3. This design utilizes the deformation capability of the elastic material to continuously compensate for the assembly gap between the magnet 3 and the outer shell; simultaneously, the two opposing sealing sheets apply a restraining force to the magnet 3 from both sides, achieving both bidirectional blocking of foreign objects and providing a certain degree of stability to the magnet 3 in the radial direction.

[0026] The grid plate fixing plates 8 are respectively disposed on the opposing inner sides of the first housing 10 and the second housing 11. Multiple arc-extinguishing grid plates 9 are arranged between the grid plate fixing plates 8 on both sides, and the extending direction of the arc-extinguishing grid plates 9 is inclined relative to the side wall of the magnet housing 1. The purpose of this design is to allow multiple plate-shaped arc-extinguishing grid plates 9 to be directly inserted and fitted into the corresponding slots of the fixing plates on both sides by integrally forming or adding plate-shaped grid plate fixing plates 8 with parallel slots on the inner side walls of the first housing 10 and the second housing 11. This allows the arc-extinguishing grid plate 9 to be erected at a preset tilt angle and mechanically locked between the two housings. This design achieves rapid and accurate installation and fixing of the arc-extinguishing grid plates 9, ensuring the consistency of the tilt angle and positional stability of all grid plates; at the same time, the tilted grid plates change the direction and path of the arc entering the grid plate area.

[0027] The top plate 12 is detachably connected to the top of the first housing 10 and the second housing 11, and covers the top area of ​​the grid fixing plate 8. The top plate 12 has multiple pressure relief holes 13. The purpose of this design is to detachably connect the plate-shaped top plate 12, which adapts to the top contour of the housing, to the top of the first housing 10 and the second housing 11 using a threaded connection or snap-fit ​​structure, so that it covers the grid fixing plate 8. Multiple through holes are regularly formed on the top plate 12 as pressure relief holes 13. During the arc extinguishing process, the high-temperature and high-pressure gas generated by the arc can be directionally discharged through the pressure relief holes 13, helping to balance the internal pressure of the arc extinguishing chamber and prevent excessive gas pressure accumulation. Simultaneously, the detachable connection allows the top plate 12 to be removed separately, providing a direct channel for observing the internal condition or performing maintenance.

[0028] Through the above technical solution, the magnet 3 is first installed upwards into the internal cavity 4 through the insertion port 2 at the bottom of the magnet outer shell 1, which is composed of the first shell 10 and the second shell 11, and locked in place by the hinged locking cover plate 5; a pair of opposing elastic sealing plates 6 on the inner side of the insertion port 2 then come into close contact with the surface of the magnet 3 to form a seal. At the same time, the grid fixing plate 8 fixed to the inner side of the two shells supports multiple arc-extinguishing grid plates 9 arranged at a certain angle, forming an arc-extinguishing grid plate 9 group. The top plate 12, which is detachably connected to the top of the shell, covers the grid fixing plate 8, and the pressure relief hole 13 on it keeps the internal and external air pressure connected. Finally, the magnet 3 assembly integrating all the above features is used as the core module in the entire arc-extinguishing chamber. The advantages of this design are: the magnet 3 is completely encapsulated to isolate it from the environment, reducing the risk of pollution and leakage; the inclined arc-extinguishing grid 9 optimizes the arc's extension and cutting path; the detachable top plate 12 and bottom locking structure facilitate assembly and maintenance; and the pressure relief hole 13 helps release internal pressure, enabling the entire arc-extinguishing chamber to maintain structural stability while possessing reliable arc-extinguishing function and long-term workability.

[0029] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A magnet assembly for an arc-extinguishing chamber, disposed within a circuit breaker, characterized in that, include: The magnet housing (1) includes a first housing (10) and a second housing (11) arranged opposite to each other and having an internal cavity (4), and the bottom of the first housing (10) and the second housing (11) is provided with an insertion port (2) communicating with the internal cavity (4). The magnet (3) can be installed in the internal cavity (4) through the insertion port (2); A locking cover (5) is movably disposed at the insertion port (2) and is operable to lock the magnet (3) in the internal cavity (4) of the magnet housing (1) after the magnet (3) is installed in the internal cavity (4).

2. A magnet assembly for an arc-extinguishing chamber according to claim 1, characterized in that, The inner edge of the insertion port (2) has two opposing elastic sealing pieces (6), which are in close contact with the outer surface of the magnet (3) after the magnet (3) is installed.

3. A magnet assembly for an arc-extinguishing chamber according to claim 1, characterized in that, The locking cover (5) is connected to the magnet housing (1) via a hinge shaft (7).

4. A magnet assembly for an arc-extinguishing chamber according to claim 1, characterized in that, It also includes a grid plate fixing plate (8), which is respectively disposed on the opposing inner sides of the first housing (10) and the second housing (11).

5. A magnet assembly for an arc-extinguishing chamber according to claim 4, characterized in that, It also includes multiple arc-extinguishing grid plates (9), which are arranged between the grid plate fixing plates (8) on both sides.

6. A magnet assembly for an arc-extinguishing chamber according to claim 5, characterized in that, The arc-extinguishing grid plate (9) is inclined relative to the side wall of the magnet housing (1).

7. A magnet assembly for an arc-extinguishing chamber according to any one of claims 4-6, characterized in that, It also includes a top plate (12), which is detachably connected to the top of the first housing (10) and the second housing (11) and covers the top area of ​​the grid plate fixing plate (8). The top plate (12) has multiple pressure relief holes (13).

8. An arc-extinguishing chamber, characterized in that, Includes a magnet assembly for an arc-extinguishing chamber as described in any one of claims 1-7.

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