Non-polar direct-current arc magnetic drive structure utilizing strip-shaped magnet

Abstract

The utility model provides a non-polarity direct-current arc magnetic drive structure using bar magnets. The non-polarity direct-current arc magnetic drive structure comprises a first contact, a second contact, a first bar magnet, a second bar magnet, a first magnetizer, a second magnetizer, a first insulating flash barrier and a second insulating flash barrier. A first insulating flash barrier, a first bar-shaped magnet, a first magnetizer, a second insulating flash barrier, a second bar-shaped magnet and a second magnetizer are arranged on the two sides of the first contact and the two sides of the second contact respectively, and the first insulating flash barrier, the first bar-shaped magnet and the first concentrating flux plate are sequentially arranged in the direction away from the movable contact and the static contact. And the second insulating flash barrier, the second bar-shaped magnet and the second magnetic conductive plate are sequentially arranged along the direction far away from the movable contact and the static contact. The purpose that electric arcs in any current direction can move towards the opening direction of the movable contact and the static contact is achieved, and the device can be used for development of high-performance low-voltage switching devices.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a non-polar direct current arc magnetic drive structure utilizing a bar magnet. Background Art

[0002] The DC circuit breaker is the most important protection device in the DC power distribution system. It is required to be able to carry and break the normal loop current, and also to carry and break the overload and short-circuit current within a specified time. With the development of new energy technology, in order to improve power generation efficiency, reduce construction costs, and save volume, the working voltage of the photovoltaic system is getting higher and higher, and higher requirements are also put forward for the working voltage and breaking capacity of the DC circuit breaker. The difficulty of breaking the short-circuit current and critical current is greatly increased. The existing means usually increase the arc voltage by stretching the arc, ablating the gas-producing material to cool the arc or compressing the arc to drive the arc movement, increasing the magnetic field to accelerate the arc movement, and other technologies. Under the constraints of cost and volume, the method of stretching the arc has great limitations, and the driving, compression, and cooling effects of the arc on the arc by relying on the arc energy and the electromagnetic field are also limited. In contrast, the use of an external permanent magnet can greatly improve the driving effect of the magnetic field on the arc. However, in general, permanent magnets have polarity. To achieve non-polarity control of bidirectional DC current, reasonable settings and regulation of the magnetic field are required, which is difficult and has been a technical hotspot for long-term research by technicians in this field. 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 DC arc magnetic drive structure using bar magnets, which uses bar magnets to magnetize the magnetized body to form a unipolar magnetic field coverage area in the arc and its moving area, so as to realize the Lorentz force that drives the bidirectional DC arc away from the moving and static contact areas, which helps the arc to enter the arc extinguishing chamber and extinguish, thereby improving the breaking capacity and electrical life of the switch electrical appliance.

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

[0005] The utility model provides a non-polar DC arc magnetic drive structure using a bar magnet, comprising a first contact (1), a second contact (2), a first bar magnet (3), a second bar magnet (4), a first magnetized body (5), a second magnetized body (6), a first insulating arc isolation plate (7), and a second insulating arc isolation plate (8);

[0006] The first contact (1) and the second contact (2) are arranged opposite to each other and sandwiched between the first bar magnet (3), the first magnetized body (5), the first insulating arc-isolating plate (7) and the second bar magnet (4), the second magnetized body (6), and the second insulating arc-isolating plate (8); the first bar magnet (3), the first magnetized body (5), and the first insulating arc-isolating plate (7) are located on one side of the first contact (1) and the second contact (2); the second bar magnet (4), the second magnetized body (6), and the second insulating arc-isolating plate (8) are located on the other side of the first contact (1) and the second contact (2); the first insulating arc-isolating plate (7) is located between the first contact (1), the second contact (2) and the first bar magnet (3), the first magnetized body (5); and the second insulating arc-isolating plate (8) is located between the first contact (1), the second contact (2) and the second bar magnet (4), the second magnetized body (6);

[0007] The first magnetized body (5) and the second magnetized body (6) have the same structure and are arranged in parallel; the first contact (1) and the second contact (2) are located at one end of the first magnetized body (5) and the second magnetized body (6), and the first bar magnet (3) and the second bar magnet (4) are located at the other end of the first magnetized body (5) and the second magnetized body (6).

[0008] Furthermore, the first bar magnet (3) and the second bar magnet (4) comprise two polar ends, and the axes of the two polar ends are perpendicular to or at an angle of 0° to 90° to the line connecting the center points of the first contact (1) and the second contact (2).

[0009] Furthermore, when the first contact (1) and the second contact (2) are placed in the same direction, the direction polarities of both are N poles or S poles at the same time.

[0010] Furthermore, the first bar magnet (3) and the first magnetized body (5) are placed flat, that is, they are placed in sequence in a direction away from the first contact point (1) and the second contact point (2).

[0011] Furthermore, the second bar magnet (4) and the second magnetized body (6) are placed flat, that is, they are placed in sequence in a direction away from the first contact point (1) and the second contact point (2).

[0012] Furthermore, the first bar magnet (3) and the first magnetized body (5) are placed overlappingly, that is, they are placed in sequence along a direction perpendicular to the first insulating arc isolation plate (7), and the stacking order of the first bar magnet (3) and the first magnetized body (5) along the direction perpendicular to the first insulating arc isolation plate (7) is the same as the stacking order of the second bar magnet (4) and the second magnetized body (6) along the direction perpendicular to the second insulating arc isolation plate (8).

[0013] Furthermore, the second bar magnet (4) and the second magnetized body (6) are placed overlapping each other, that is, they are placed in sequence along a direction perpendicular to the second insulating arc isolation plate (8).

[0014] Furthermore, the materials of the first magnetized body (5) and the second magnetized body (6) are ferromagnetic materials, including ferroferrous iron oxide, nickel, cobalt and alloys thereof.

[0015] Compared with the prior art, the utility model has the following beneficial effects: by adopting the structural scheme provided in the present application, bar magnets are used to magnetize the magnetized bodies made of ferromagnetic materials on both sides of the moving and static contacts respectively, thereby forming a magnetic field coverage area with unipolarity in the arc and its movement area, avoiding the influence of polarity reversal on the direction of arc movement, and realizing the Lorentz force driving the bidirectional DC arc away from the moving and static contact areas, which helps the arc to enter the arc extinguishing chamber to extinguish the arc, thereby improving the breaking capacity and electrical life of the switch electrical appliance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 It is a schematic diagram of the front view of the non-polar magnetic field arc-starting structure for pulling the arc movement according to an embodiment of the utility model;

[0018] Figure 2 It is a schematic top view of the non-polar magnetic field arc-starting structure for pulling the arc to move according to an embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the layout structure of the permanent magnet and the magnetic conductive plate of the embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the arc force of an embodiment of the utility model (the N pole of the permanent magnet faces the arc area, and the current flows into the paper);

[0021] Figure 5 This is a schematic diagram of arc force in an embodiment of the utility model (the N pole of the permanent magnet faces the arc area, and the current flows out of the paper);

[0022] Figure 6 This is a schematic diagram of arc force in an embodiment of the utility model (the N pole of the permanent magnet faces the arc area, and the current flows into the paper);

[0023] Figure 7This is a schematic diagram of arc force in an embodiment of the utility model (the N pole of the permanent magnet faces the arc area, and the current flows out of the paper);

[0024] Figure 8 This is a schematic diagram of the layout structure of the permanent magnet and the magnetic conductive plate of an embodiment of the utility model (the N pole of the permanent magnet faces the arc area);

[0025] Fig. 9 This is a schematic diagram of the layout structure of the permanent magnet and the magnetic conductive plate of the embodiment of the utility model (the N pole of the permanent magnet faces the arc area)

[0026] Reference numerals:

[0027] 1 is the first contact; 2 is the second contact; 3 is the first bar magnet; 4 is the second bar magnet; 5 is the first magnetized body; 6 is the second magnetized body; 7 is the first insulating arc-isolating plate; and 8 is the second insulating arc-isolating plate. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The embodiments described are only part of the embodiments of the present invention, rather than 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 creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 and Figure 2 The utility model provides a non-polar DC arc magnetic drive structure using a bar magnet, the structure specifically comprising a first contact 1, a second contact 2, a first bar magnet 3, a second bar magnet 4, a first magnetized body 5, a second magnetized body 6, a first insulating arc isolation plate 7, and a second insulating arc isolation plate 8;

[0030] The first contact 1 and the second contact 2 are arranged opposite to each other, and are sandwiched between the first bar magnet 3, the first magnetized body 5, the first insulating arc-isolating plate 7 and the second bar magnet 4, the second magnetized body 6, and the second insulating arc-isolating plate 8. The first bar magnet 3, the first magnetized body 5, and the first insulating arc-isolating plate 7 are located on one side of the first contact 1 and the second contact 2, and the second bar magnet 4, the second magnetized body 6, and the second insulating arc-isolating plate 8 are located on the other side of the first contact 1 and the second contact 2; the first insulating arc-isolating plate 7 is located between the first contact 1, the second contact 2 and the first bar magnet 3 and the first magnetized body 5, and the second insulating arc-isolating plate 8 is located between the first contact 1, the second contact 2 and the second bar magnet 4 and the second magnetized body 6;

[0031] The first magnetized body 5 and the second magnetized body 6 have the same structure and are arranged in parallel; the first contact 1 and the second contact 2 are located at one end of the first magnetized body 5 and the second magnetized body 6, the first bar magnet 3 is located at the other end of the first magnetized body 5 and the second bar magnet 4 is located at the other end of the second magnetized body 6;

[0032] The first bar magnet 3 and the second bar magnet 4 each include two polarity ends, and the angle between the axes of the two polarity ends and the connecting line of the center points of the first contact 1 and the second contact 2 is 0° or 90°; the first bar magnet 3 and the second bar magnet 4 are arranged with the symmetry plane of the first magnetized body 5 and the second magnetized body 6 as the symmetry plane, and have the same polarity direction.

[0033] Furthermore, the polarities of the first contact 1 and the second contact 2 are both consistent in direction from the S pole to the N pole or from the S pole to the N pole.

[0034] Furthermore, the first bar magnet 3 and the first magnetized body 5 are laid flat and are placed in sequence in a direction away from the first contact 1 and the second contact 2 .

[0035] Furthermore, the first bar magnet 3 and the first magnetized body 5 are placed overlapping each other and are placed in sequence in a direction perpendicular to and in contact with the first insulating arc isolation plate 7 .

[0036] Furthermore, the second bar magnet 4 and the second magnetized body 6 are laid flat and are placed in sequence in a direction away from the first contact 1 and the second contact 2 .

[0037] Furthermore, the second bar magnet 4 and the second magnetized body 6 are placed overlapping each other, that is, they are placed in sequence along a direction perpendicular to the second insulating arc isolation plate 8 .

[0038] Furthermore, the materials of the first magnetized body 5 and the second magnetized body 6 are ferromagnetic, including ferroferrous iron tetroxide, nickel, cobalt and alloys thereof.

[0039] In a specific embodiment, the first contact 1 is a moving contact, the second contact 2 is a static contact, the first bar magnet 3 is a first permanent magnet, the second bar magnet 4 is a second permanent magnet, the first magnetized body 5 is a first magnetic conductive plate, the second magnetized body 6 is a second magnetic conductive plate, 7 the first insulating arc-isolating plate is a first magnetic conductive plate cover plate, 8 the second insulating arc-isolating plate is a second magnetic conductive plate cover plate;

[0040] The first magnetic conductive plate cover, the first permanent magnet, the first magnetic conductive plate, and the second magnetic conductive plate cover, the second permanent magnet, and the second magnetic conductive plate are respectively placed on both sides of the moving contact and the stationary contact. The first magnetic conductive plate cover, the first permanent magnet, and the first magnetic conductive plate are placed in sequence in a direction away from the moving contact and the stationary contact. The second magnetic conductive plate cover, the second permanent magnet, and the second magnetic conductive plate are placed in sequence in a direction away from the moving contact and the stationary contact.

[0041] The first permanent magnet and the second permanent magnet each include an N-polarity surface and an S-polarity surface, the same-polarity end surfaces of the first permanent magnet and the second permanent magnet are arranged opposite to each other, and the same-polarity surfaces of the first permanent magnet and the second permanent magnet are parallel or the angle between them is less than 90°;

[0042] The other polar surface of the first permanent magnet is in contact with the first magnetic conductive plate or is at a distance of less than 5 mm, and the other polar surface of the second permanent magnet is in contact with the second magnetic conductive plate or is at a distance of less than 5 mm;

[0043] The first permanent magnet and the second permanent magnet are respectively located at one end of the first magnetic conductive plate and the second magnetic conductive plate away from the moving contact and the stationary contact.

[0044] Furthermore, the first magnetic conductive plate and the second magnetic conductive plate are made of the same material and have the same size, and the material is selected to have a higher magnetic permeability.

[0045] Furthermore, the first magnetic conductive plate cover plate and the second magnetic conductive plate cover plate are made of high temperature resistant and insulating materials, and are gas generating or non-gas generating materials.

[0046] Furthermore, a metal grid arc extinguishing chamber is provided between the first magnetic conductive plate cover plate and the second magnetic conductive plate cover plate, and the metal grid arc extinguishing chamber is located in an opening direction of the moving contact and the static contact in an open state.

[0047] It should be noted that the non-polar DC arc magnetic drive structure using bar magnets provided by the utility model can, in any case, control the static contact and the moving contact to achieve current conduction during the contact process by adjusting the magnetization condition of the first bar magnet to the first magnetized body and the magnetization condition of the second bar magnet to the second magnetized body, so that the arc released by the current conductor is forced to be guided to the arc extinguishing chamber, thereby improving the breaking capacity and electrical life of the switching electrical appliance.

[0048] like Figure 3 As shown, Figure 3 This is a schematic diagram of the layout structure of the permanent magnet and the magnetic conductive plate of the embodiment of the utility model Figures 4 to 9 By changing the positions of the first bar magnet and the second bar magnet, under different magnetization conditions of the first magnetized body and the second magnetized body, by arranging a permanent magnet in front of the opening direction of the moving and static contacts, and then using a magnetic conductive plate to generate a three-dimensional magnetic field distribution in the moving and static contacts and the arc movement area to drive the arc to move in the direction of the moving and static contact openings, the purpose of enabling the arc of any current direction to move in the direction of the moving and static contact openings is achieved, and it can be used for the development of higher performance low-voltage switch electrical appliances.

[0049] 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 DC arc magnetic drive structure using a bar magnet, characterized in that: It comprises a first contact (1), a second contact (2), a first bar magnet (3), a second bar magnet (4), a first magnetized body (5), a second magnetized body (6), a first insulating arc-isolating plate (7), and a second insulating arc-isolating plate (8); The first contact (1) and the second contact (2) are arranged opposite to each other and sandwiched between the first bar magnet (3), the first magnetized body (5), the first insulating arc-isolating plate (7) and the second bar magnet (4), the second magnetized body (6), and the second insulating arc-isolating plate (8); the first bar magnet (3), the first magnetized body (5), and the first insulating arc-isolating plate (7) are located on one side of the first contact (1) and the second contact (2); the second bar magnet (4), the second magnetized body (6), and the second insulating arc-isolating plate (8) are located on the other side of the first contact (1) and the second contact (2); the first insulating arc-isolating plate (7) is located between the first contact (1), the second contact (2) and the first bar magnet (3), the first magnetized body (5); and the second insulating arc-isolating plate (8) is located between the first contact (1), the second contact (2) and the second bar magnet (4), the second magnetized body (6); The first magnetized body (5) and the second magnetized body (6) have the same structure and are arranged in parallel; the first contact (1) and the second contact (2) are located at one end of the first magnetized body (5) and the second magnetized body (6), and the first bar magnet (3) and the second bar magnet (4) are located at the other end of the first magnetized body (5) and the second magnetized body (6).

2. The non-polar DC arc magnetic drive structure using bar magnets according to claim 1, characterized in that: The first bar magnet (3) and the second bar magnet (4) comprise two polar ends, and the axes of the two polar ends are perpendicular to or at an angle of 0° to 90° to the line connecting the center points of the first contact (1) and the second contact (2).

3. The non-polar DC arc magnetic drive structure using bar magnets as claimed in claim 2, characterized in that: The first bar magnet (3) and the second bar magnet (4) are arranged with the symmetry plane of the first magnetized body (5) and the second magnetized body (6) as the symmetry plane, and have the same polarity direction.

4. The non-polar DC arc magnetic drive structure using bar magnets as claimed in claim 3, characterized in that: When the first contact (1) and the second contact (2) are placed in the same direction, the direction polarities of both are N poles or S poles at the same time.

5. The non-polar DC arc magnetic drive structure using bar magnets according to claim 1, characterized in that: The first bar magnet (3) and the first magnetized body (5) are laid flat.

6. The non-polar DC arc magnetic drive structure using bar magnets according to claim 1, characterized in that: The first bar magnet (3) and the first magnetized body (5) are placed in sequence along a direction away from the first contact point (1) and the second contact point (2).

7. The non-polar DC arc magnetic drive structure using bar magnets as claimed in claim 1, characterized in that: The second bar magnet (4) and the second magnetized body (6) are laid flat and are placed in sequence in a direction away from the first contact point (1) and the second contact point (2).

8. The non-polar DC arc magnetic drive structure using bar magnets as claimed in claim 1, characterized in that: The first bar magnet (3) and the first magnetized body (5) are placed overlappingly, that is, they are placed in sequence along a direction perpendicular to the first insulating arc isolation plate (7), and the stacking order of the first bar magnet (3) and the first magnetized body (5) along the direction perpendicular to the first insulating arc isolation plate (7) is the same as the stacking order of the second bar magnet (4) and the second magnetized body (6) along the direction perpendicular to the second insulating arc isolation plate (8).

9. The non-polar DC arc magnetic drive structure using bar magnets according to claim 1, characterized in that: The second bar magnet (4) and the second magnetized body (6) are placed overlapping each other, that is, they are placed in sequence along a direction perpendicular to the second insulating arc isolation plate (8).

10. The non-polar DC arc magnetic drive structure using bar magnets according to claim 1, characterized in that: The materials of the first magnetized body (5) and the second magnetized body (6) are ferromagnetic materials, including ferroferrous iron tetroxide, nickel, cobalt and alloys thereof.

Images