Nonpolar magnetic drive arc structure through magnetized ferromagnet

Abstract

The utility model provides a non-polarity magnetic drive arc structure through a magnetized ferromagnet. The non-polarity magnetic drive arc structure comprises a contact assembly (1), a magnet (2), a first ferromagnet (3), a second ferromagnet (4) and an arc extinguish chamber (5). The first ferromagnet (3) and the second ferromagnet (4) are of an L-shaped structure and are arranged to be of a U-shaped structure, the long sides of the ferromagnets are located on the two sides of the contact assembly (1) to form an electric arc generation cavity (6), the short sides of the L-shaped structures of the first ferromagnet (3) and the second ferromagnet (4) are located on the same plane, the magnet (2) is arranged in the gap, and the polar end of the magnet (2) faces the electric arc generation cavity (6). According to the utility model, only magnetic field distribution for driving the electric arc to move in a single direction in an electric arc generating area, a moving area and an arc extinguishing area is realized, the defect of a large-size permanent magnet is avoided, and the development of a high-performance, low-cost and compact low-voltage switching device is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a non-polar magnetically driven arc structure through magnetizing a ferromagnetic body. Background Art

[0002] With the development of arc theory and arc extinguishing technology, more and more arc control and arc extinguishing structures are applied to low-voltage switchgear. Generally speaking, they can be divided into two categories: one is to rely on the electromagnetic field and heat of the arc itself, and to guide the arc direction by optimizing the conductive structure and airflow channel; the other is to use external components to enhance the electromagnetic field effect and air-blowing arc effect, such as adding magnetic conductors, gas-generating materials, arc-blowing coils or permanent magnets. Among them, permanent magnets, as a measure that can artificially set the magnetic field size without relying on the arc current, have great application potential. However, because permanent magnets themselves have polarity, if only part of their magnetic field distribution is used to drive the arc, a very large permanent magnet volume is required, which will not only cause a significant increase in product cost and volume, but also cause magnetic field interference to other equipment. If a small-volume permanent magnet is used, how to avoid the influence of reverse magnetic field distribution becomes a technical obstacle. Utility Model Content

[0003] In view of the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide a non-polar magnetically driven arc structure by magnetizing a ferromagnetic body, using a bar magnet to magnetize a magnetized body of a specific structure, thereby achieving a magnetic field distribution that only drives the arc to move in one direction in the arc generation area, the movement area and the arc extinguishing area, while avoiding the disadvantages of large-volume permanent magnets, and contributing to the development of high-performance, low-cost, compact low-voltage switching electrical appliances.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a non-polar magnetic arc driving structure through magnetizing a ferromagnetic body, comprising a contact assembly (1), a magnet (2), a first ferromagnetic body (3), a second ferromagnetic body (4), and an arc extinguishing chamber (5);

[0006] The contact assembly (1) is a pair of metal switch contacts, wherein the pair of switch contacts comprises a fixed contact and a movable contact that can move relative to the fixed contact, and when the energized switch contacts are opened, an arc is generated between the fixed contact and the movable contact;

[0007] The first ferromagnet (3) and the second ferromagnet (4) have the same structure and are symmetrically arranged along a middle plane where the movable contact moves relative to the fixed contact in the contact assembly (1). The first ferromagnet (3) and the second ferromagnet (4) are located on both sides of the contact assembly (1) to form an arc generating chamber (6);

[0008] The first ferromagnet (3) and the second ferromagnet (4) are L-shaped structures, the first ferromagnet (3) and the second ferromagnet (4) are arranged in a U-shaped structure, the area sandwiched by the long side (302) of the L-shaped structure of the first ferromagnet (3) and the long side (402) of the L-shaped structure of the second ferromagnet (4) is the area where the arc generating chamber (6) is located, the short side (303) of the L-shaped structure of the first ferromagnet (3) and the short side (403) of the L-shaped structure of the second ferromagnet (4) are located in the same plane, and there is a gap, and a magnet (2) is arranged in the gap;

[0009] The arc extinguishing chamber (5) is composed of a plurality of mutually spaced and parallel metal grids, and is arranged in the area sandwiched between the long sides of the U-shaped structures of the first ferromagnet (3) and the second ferromagnet (4), and is located at one end of the arc generating chamber (6) away from the magnet (2).

[0010] Furthermore, the magnet (2) is a bar magnet, with its polarity end facing the arc generating chamber (6).

[0011] Furthermore, the polarity of the magnet (2) is arranged in parallel along the middle plane where the movable contact in the contact assembly (1) moves relative to the fixed contact, with the N pole facing the opening direction of the U-shaped structure of the first ferromagnet (3) and the second ferromagnet (4), or the S pole facing the opening direction of the U-shaped structure of the first ferromagnet (3) and the second ferromagnet (4).

[0012] Furthermore, the short sides of the L-shaped structures of the first ferromagnet (3) and the second ferromagnet (4) are close to or in contact with the polarity end of the magnet (2) facing the arc generating chamber (6), and away from the other polarity end.

[0013] Furthermore, right-angle extensions (301) and (401) are provided on the short sides of the L-shaped structures of the first ferromagnetic body (3) and the second ferromagnetic body (4).

[0014] Furthermore, the right-angle extensions (301) and (401) are used to increase the magnetization effect of the first ferromagnetic body (3) and the second ferromagnetic body (4).

[0015] Furthermore, insulating layers are provided between the arc generating chamber (6), the arc extinguishing chamber (5), the first ferromagnetic body (3), and the second ferromagnetic body (4).

[0016] Furthermore, the first ferromagnetic body (3) and the second ferromagnetic body (4) may also be replaced by a U-shaped ferromagnetic body.

[0017] Compared with the prior art, the utility model has the following beneficial effects: by adopting the structural scheme provided in the present application, a bar magnet is used to magnetize a magnetized body of a specific structure, thereby achieving a magnetic field distribution that only drives the arc to move in one direction in the arc generation area, the movement area and the arc extinguishing area, while avoiding the disadvantages of large-volume permanent magnets, and facilitating the development of high-performance, low-cost, compact low-voltage switching electrical appliances. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the solutions in the prior art, the drawings required for use are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Schematic diagram of the non-polar magnetic drive arc structure by magnetizing the ferromagnetic body in Example 1 of the utility model (the N pole of the permanent magnet faces the arc area);

[0020] Figure 2 Schematic diagram of the non-polar magnetic drive arc structure by magnetizing the ferromagnetic body in Example 1 of the utility model (the S pole of the permanent magnet faces the arc area);

[0021] Figure 3 Schematic diagram of magnetic force line distribution and arc force of Example 1 of the utility model (the N pole of the permanent magnet faces the arc area and the current flows into the paper);

[0022] Figure 4 Schematic diagram of magnetic force line distribution and arc force of Example 1 of the utility model (the N pole of the permanent magnet faces the arc area and the current flows out of the paper);

[0023] Figure 5 Schematic diagram of magnetic force line distribution and arc force of Example 1 of the utility model (the S pole of the permanent magnet faces the arc area and the current flows into the paper);

[0024] Figure 6 Schematic diagram of magnetic force line distribution and arc force of Example 1 of the utility model (the S pole of the permanent magnet faces the arc area and the current flows out of the paper);

[0025] Figure 7 Schematic diagram of the non-polar magnetic drive arc structure by magnetizing the ferromagnetic body in Example 2 of the present utility model (the N pole of the permanent magnet faces the arc area);

[0026] Figure 8 Schematic diagram of the non-polar magnetic drive arc structure by magnetizing the ferromagnetic body in Example 3 of the utility model (the N pole of the permanent magnet faces the arc area);

[0027] Fig. 9Schematic diagram of the non-polar magnetic drive arc structure by magnetizing the ferromagnetic body in Example 4 of the utility model (the N pole of the permanent magnet faces the arc area);

[0028] Fig.10 Schematic diagram of the non-polar magnetic drive arc structure by magnetizing the ferromagnetic body in Example 5 of the utility model (the N pole of the permanent magnet faces the arc area);

[0029] Fig.11 Schematic diagram of the non-polar magnetically driven arc structure by magnetizing a ferromagnetic body in Example 6 of the utility model (the N pole of the permanent magnet faces the arc region). DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The embodiments are only part of the embodiments of the present invention, not all of the embodiments. It should be noted that the embodiments listed in the present invention and the features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-2 , Embodiment 1 of the present invention provides a non-polar magnetic arc driving structure through magnetizing a ferromagnetic body, comprising a contact assembly (1), a magnet (2), a first ferromagnetic body (3), a second ferromagnetic body (4), and an arc extinguishing chamber (5);

[0032] The contact assembly (1) is a pair of metal switch contacts, wherein the pair of switch contacts comprises a fixed contact and a movable contact that can move relative to the fixed contact, and when the energized switch contacts are opened, an arc is generated between the fixed contact and the movable contact;

[0033] The first ferromagnet (3) and the second ferromagnet (4) have the same structure and are symmetrically arranged along a middle plane where the movable contact moves relative to the fixed contact in the contact assembly (1). The first ferromagnet (3) and the second ferromagnet (4) are located on both sides of the contact assembly (1) to form an arc generating chamber (6);

[0034] The first ferromagnet (3) and the second ferromagnet (4) are L-shaped structures, the first ferromagnet (3) and the second ferromagnet (4) are arranged in a U-shaped structure, the area sandwiched by the long side (302) of the L-shaped structure of the first ferromagnet (3) and the long side (402) of the L-shaped structure of the second ferromagnet (4) is the area where the arc generating chamber (6) is located, the short side (303) of the L-shaped structure of the first ferromagnet (3) and the short side (403) of the L-shaped structure of the second ferromagnet (4) are located in the same plane, and there is a gap, and a magnet (2) is arranged in the gap;

[0035] The arc extinguishing chamber (5) is composed of a plurality of mutually spaced and parallel metal grids, and is arranged in the area sandwiched between the long sides of the U-shaped structures of the first ferromagnet (3) and the second ferromagnet (4), and is located at one end of the arc generating chamber (6) away from the magnet (2).

[0036] Furthermore, the magnet (2) is a bar magnet, and its polarity end faces the arc generating chamber (6), that is, the polarity of the magnet (2) is arranged parallel to the middle plane where the moving contact moves relative to the fixed contact in the contact assembly (1), and the N pole faces the opening direction of the U-shaped structure of the first ferromagnet (3) and the second ferromagnet (4), or the S pole faces the opening direction of the U-shaped structure of the first ferromagnet (3) and the second ferromagnet (4).

[0037] Furthermore, the short sides of the L-shaped structure of the first ferromagnet (3) and the second ferromagnet (4) are close to or in contact with the polarity end of the magnet (2) facing the arc generating chamber (6), and away from the other polarity end; the short sides of the L-shaped structure of the first ferromagnet (3) and the second ferromagnet (4) are provided with right-angle extension parts (301) and (401), and the right-angle extension parts (301) and (401) are used to increase the magnetization effect of the first ferromagnet (3) and the second ferromagnet (4).

[0038] Furthermore, insulating layers are provided between the arc generating chamber (6), the arc extinguishing chamber (5), the first ferromagnetic body (3), and the second ferromagnetic body (4).

[0039] See also Figures 3-4 , the figure shows the distribution of magnetic lines of force and arc force diagram in the arc generation area, movement area and arc extinguishing area when the permanent magnet N pole is arranged toward the arc area in Example 1 of the utility model, Figure 3 The arc current flows into the paper direction. Figure 4 The direction of outflow from the paper. Figure 3 For example, the arc current flows into the paper. In the arc generating chamber (6), if the arc is biased toward the long side (402) of the second ferromagnet (4), according to the left-hand rule, the arc will be subjected to the Lorentz force in the direction of the long side (302) of the first ferromagnet (3). If the arc is biased toward the long side (302) of the first ferromagnet (3), the arc will be further biased toward the long side (302) and will also be subjected to a component force pointing to the direction of the arc extinguishing chamber (5). Figure 4 In the situation shown, when the arc current flows out of the paper, the arc will be subject to a Lorentz force biased toward the long side (402) of the second ferromagnet (4). When the arc moves close to the long side (402) of the second ferromagnet (4), the arc will be subject to a component force pointing in the direction of the arc extinguishing chamber (5).

[0040] See also Figures 5-6, the figure shows the distribution of magnetic lines of force and arc force diagram in the arc generation area, movement area and arc extinguishing area when the permanent magnet S pole is arranged toward the arc area in the first embodiment of the utility model, which is similar to the above Figures 3-4 Similar to the analysis of , no matter the arc current flows into or out of the paper, the arc will be biased towards the long side direction of the first ferromagnetic body (3) or the second ferromagnetic body (4), and then be subjected to a component force pointing towards the arc extinguishing chamber (5).

[0041] Furthermore, the first ferromagnetic body (3) and the second ferromagnetic body (4) may also be replaced by a U-shaped ferromagnetic body.

[0042] Specifically, Figure 7 to Figure 11 Also provided are embodiments 2 to 6 of different ferromagnetic and magnet matching structures, all of which can achieve the above functions.

[0043] The utility model proposes a non-polar magnetic arc drive structure by magnetizing a ferromagnetic body, which uses a bar magnet to magnetize a magnetized body of a specific structure, thereby achieving a magnetic field distribution that only drives the arc to move in one direction in the arc generation area, the movement area and the arc extinguishing area, while avoiding the disadvantages of large-volume permanent magnets, and contributing to the development of high-performance, low-cost, compact low-voltage switching electrical appliances.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to impose any limitation on the technical solution of the present invention. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution may be subjected to several simple modifications and substitutions, and these modifications and substitutions are also within the scope of protection covered by the claims.

Claims

1. A non-polar magnetically driven arc structure by magnetizing a ferromagnetic body, characterized in that: It comprises a contact assembly (1), a magnet (2), a first ferromagnetic body (3), a second ferromagnetic body (4), and an arc extinguishing chamber (5); The contact assembly (1) is a pair of metal switch contacts, and the pair of metal switch contacts comprises a fixed contact and a movable contact that can move relative to the fixed contact, and when the energized switch contacts are opened, an arc is generated between the fixed contact and the movable contact; The first ferromagnetic body (3) and the second ferromagnetic body (4) have the same structure and are symmetrically arranged along a middle plane where the movable contact in the contact assembly (1) moves relative to the fixed contact. The first ferromagnetic body (3) and the second ferromagnetic body (4) are located on both sides of the contact assembly (1) to form an arc generating chamber (6); The first ferromagnet (3) and the second ferromagnet (4) are L-shaped structures, the first ferromagnet (3) and the second ferromagnet (4) are arranged in a U-shaped structure, the area sandwiched by the long side (302) of the L-shaped structure of the first ferromagnet (3) and the long side (402) of the L-shaped structure of the second ferromagnet (4) is the area where the arc generating chamber (6) is located, the short side (303) of the L-shaped structure of the first ferromagnet (3) and the short side (403) of the L-shaped structure of the second ferromagnet (4) are located in the same plane, and there is a gap, and a magnet (2) is arranged in the gap; The arc extinguishing chamber (5) is composed of a plurality of mutually spaced and parallel metal grids, which are arranged in the area sandwiched between the long sides of the U-shaped structures of the first ferromagnet (3) and the second ferromagnet (4), and are located at one end of the arc generating chamber (6) away from the magnet (2).

2. The non-polar magnetically driven arc structure by magnetizing ferromagnetic body as claimed in claim 1, characterized in that: The magnet (2) is a bar magnet, with its polarity end facing the arc generating chamber (6).

3. The non-polar magnetically driven arc structure by magnetizing ferromagnetic body as claimed in claim 2, characterized in that: The polarity of the magnet (2) is arranged in parallel along the middle plane where the movable contact in the contact assembly (1) moves relative to the fixed contact, with the N pole facing the opening direction of the U-shaped structure of the first ferromagnet (3) and the second ferromagnet (4), or the S pole facing the opening direction of the U-shaped structure of the first ferromagnet (3) and the second ferromagnet (4).

4. The non-polar magnetically driven arc structure by magnetizing ferromagnetic body as claimed in claim 1, characterized in that: The short sides of the L-shaped structures of the first ferromagnet (3) and the second ferromagnet (4) are close to or in contact with the polarity end of the magnet (2) facing the arc generating chamber (6), and away from the other polarity end.

5. The non-polar magnetically driven arc structure by magnetizing ferromagnetic body as claimed in claim 1, characterized in that: The short sides of the L-shaped structures of the first ferromagnetic body (3) and the second ferromagnetic body (4) are provided with right-angle extension parts (301) and (401).

6. The non-polar magnetically driven arc structure by magnetizing ferromagnetic body as claimed in claim 5, characterized in that: The right-angle extensions (301) and (401) are used to increase the magnetization effect of the first ferromagnetic body (3) and the second ferromagnetic body (4).

7. The non-polar magnetically driven arc structure by magnetizing ferromagnetic body as claimed in claim 1, characterized in that: Insulating layers are provided between the arc generating chamber (6), the arc extinguishing chamber (5), the first ferromagnetic body (3), and the second ferromagnetic body (4).

8. The non-polar magnetically driven arc structure by magnetizing ferromagnetic body as claimed in claim 1, characterized in that: The first ferromagnetic body (3) and the second ferromagnetic body (4) may also be replaced by a U-shaped ferromagnetic body.

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