Bidirectional direct current arc extinguishing structure and direct current switch

Abstract

The utility model discloses a bidirectional direct-current arc extinguishing structure and a direct-current switch, which belong to the low-voltage direct-current arc extinguishing technology and comprise a moving contact, a static contact, a moving arc angle, a static arc angle, an arc isolating wall, a magnetizer, a permanent magnet and a grid arc extinguishing chamber, the moving arc angle is connected with the moving contact, one end of the static contact is overlapped and connected with one end of the static arc angle, and the other end of the static arc angle is overlapped and connected with the grid arc extinguishing chamber. An arc extinguishing space is formed between one face of the moving arc angle and one face of the static arc angle, the grid arc extinguishing chamber is arranged at one end of the arc extinguishing space, one end of the side wall of the magnetizer is connected with one side of the arc isolating wall in an overlapped mode, and the other end of the side wall of the magnetizer is connected with the other side of the arc isolating wall in an overlapped mode. And the permanent magnet is arranged between the other surface of the movable arc angle and the bottom of the magnetizer. According to the utility model, the driving control of the bidirectional direct-current arc to the arc extinguish chamber is realized, small-current arcs and large-current arcs are respectively extinguished in different areas, the problem of breaking of the small-current arcs such as critical current and rated current under higher voltage is solved, and the service life and the reliability of the direct-current switch are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to a bidirectional direct current arc extinguishing structure and a direct current switch. Background Art

[0002] Low-voltage switchgear is an important control and protection device in low-voltage power distribution systems, which can connect and disconnect normal and faulty circuits. AC switchgear uses the opportunity of current crossing zero to disconnect the loop current, while DC current has no natural zero crossing point. Most DC switches disconnect the current by increasing the arc voltage to force the current to cross zero.

[0003] The interruption of a unidirectional DC arc usually utilizes a permanent magnet to drive the arc to move to the arc extinguishing area, and the arc is extinguished by means of metal grids, insulating grids, narrow gaps, etc., while a bidirectional DC arc usually cannot be directly driven by a permanent magnet.

[0004] For large currents, the bidirectional DC arc can use the magnetic field and airflow field generated by itself to drive the arc to the arc extinguishing area, but for small currents such as critical current and rated current, the magnetic field and airflow field generated by the bidirectional DC arc itself are weak, and the driving effect on the arc is weak. Therefore, for the interruption of high-voltage bidirectional DC current, traditional technology is difficult to achieve a good arc extinguishing effect, and it is difficult to take into account both large and small bidirectional DC currents. Utility Model Content

[0005] The utility model aims to overcome the problem of poor arc driving and arc extinguishing effects of bidirectional direct current with a relatively high voltage, and to provide a bidirectional direct current arc extinguishing structure and a direct current switch.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A bidirectional DC arc extinguishing structure comprises a moving contact, a stationary contact, a moving arc angle, a stationary arc angle, an arc isolation wall, a magnetizer, a permanent magnet and a grid arc extinguishing chamber, wherein the moving contact is connected to the moving arc angle, a soft wire is connected between the moving arc angle and the moving contact, one end of the stationary contact overlaps and connects with one end of the stationary arc angle, one side of the moving arc angle is arranged opposite to one side of the stationary arc angle, an arc extinguishing space is formed between one side of the moving arc angle and one side of the stationary arc angle, the grid arc extinguishing chamber is arranged at one end of the arc extinguishing space, one end of the side wall of the magnetizer overlaps and connects with one side of the arc isolation wall, the other end of the side wall of the magnetizer overlaps and connects with the other side of the arc isolation wall, the permanent magnet is installed between the other side of the moving arc angle and the bottom of the magnetizer, one side of the arc isolation wall is arranged between one side of the grid arc extinguishing chamber and one side of the moving arc angle, and the other side of the arc isolation wall is arranged between one end of the moving contact and one end of the stationary contact or exceeds the other end of the moving contact and the other end of the stationary contact.

[0008] Further, the moving arc angle comprises an arc-inducing portion, a moving arc driving portion, a first arc burning portion and a second arc burning portion, one end of the arc-inducing portion is connected to the moving contact, one side of the arc-inducing portion is in contact with one side of the permanent magnet, the other end of the arc-inducing portion is connected to one end of the moving arc driving portion, one side of the moving arc driving portion and the other end of the moving arc driving portion are connected to one end of the first arc burning portion, and one end of the first arc burning portion is connected to the second arc burning portion;

[0009] The static arc angle comprises an arc striking portion, a static arc driving portion and an arc burning portion, one end of the arc striking portion is connected to one end of the static arc driving portion, the same side of the arc striking portion and the static arc driving portion is fixedly connected to one side of the static contact, and the other end of the static arc driving portion is connected to one end of the arc burning portion;

[0010] The grid arc extinguishing chamber is installed between the second arc burning portion and the arc burning portion, and the other end of the arc isolation wall is arranged between one side of the grid arc extinguishing chamber and one side of the first arc burning portion.

[0011] Furthermore, the arc extinguishing space is provided with an arc striking zone, an arc driving zone, a first arc extinguishing zone and a second arc extinguishing zone, the arc striking zone is distributed between the arc striking part and the arc attracting part, the arc driving zone is distributed between the static arc driving part and the dynamic arc driving part, the first arc extinguishing zone is distributed between the static arc driving part and the first arc burning part, and the second arc extinguishing zone is distributed between the arc burning part and the second arc burning part.

[0012] Furthermore, the grid arc extinguishing chamber is provided with a plurality of metal grids spaced apart from each other, the metal grids comprising a long metal grid and a short metal grid, one end of the long metal grid is flush with one end of the short metal grid, the other end of the long metal grid is connected to the arc driving zone, and the other end of the short metal grid is connected to the first arc extinguishing zone.

[0013] Furthermore, the arc isolation wall is provided with an arc driving part and an arc extinguishing part, the arc driving part is distributed on both sides of the arc striking zone and the arc driving zone, the arc extinguishing part is distributed on both sides of the first arc extinguishing zone, the arc isolation wall includes a first arc isolation wall and a second arc isolation wall, the first arc isolation wall and the second arc isolation wall are symmetrically arranged on both sides of the arc striking zone, the arc driving zone and the first arc extinguishing zone.

[0014] Furthermore, the magnetic conductor includes a first curved side wall, a second curved side wall and a connecting bottom, the first curved side wall and the second curved side wall are symmetrically arranged, the connecting bottom is U-shaped, one end of the first curved side wall is connected to one end of the U-shaped opening of the connecting bottom, and one end of the second curved side wall is connected to the other end of the U-shaped opening of the connecting bottom.

[0015] Further, the first arc-shaped side wall is arranged on the inner side of the arc driving part of the first arc isolation wall, the second arc-shaped side wall is arranged on the inner side of the arc driving part of the second arc isolation wall, the moving arc angle is installed inside the magnetic conductor, the U-shaped opening of the connecting bottom faces the static arc angle, the connecting bottom and the moving arc driving part are arranged opposite to each other, the permanent magnet is installed between the connecting bottom and the moving arc driving part, the first polarity surface of the permanent magnet is in contact with the connecting bottom, and the second polarity surface of the permanent magnet is in contact with the moving arc driving part.

[0016] Furthermore, the arc isolation wall is made of a high temperature resistant gas-generating insulating material, and the high temperature resistant gas-generating insulating material includes polytetrafluoroethylene, polyoxymethylene or nylon.

[0017] Furthermore, the magnetic conductor and the dynamic arc angle are made of a magnetic ferromagnetic material, the magnetic ferromagnetic material includes iron, cobalt or nickel, and the static arc angle is made of a conductive metal material, the conductive metal material includes copper or iron.

[0018] A DC switch has any one of the bidirectional DC arc extinguishing structures described above.

[0019] Compared with the prior art, the utility model has at least the following beneficial effects:

[0020] The utility model provides a bidirectional DC arc extinguishing structure, which utilizes the cooperation of a magnetic conductor, a moving arc angle and a permanent magnet to realize the driving control of the bidirectional DC arc to the arc extinguishing chamber, and then combines the distribution difference of the arc driving magnetic field on the arc movement path and the morphological characteristics of the arc column to extinguish the smaller current arc and the larger current arc in different arc extinguishing areas of the arc extinguishing space respectively. It is effective for bidirectional DC arcs, solves the problem of breaking smaller current arcs such as critical current and rated current under higher voltage, and helps to improve the service life and reliability of DC switches.

[0021] The first arc extinguishing zone provided by the utility model utilizes the compression and cooling effect of the magnetic field and the side wall of the gas-generating insulating material on the arc to extinguish the arc, and the second arc extinguishing zone uses a multi-grid arc extinguishing method to extinguish the arc. The arc with a smaller current and the arc with a larger current are extinguished in the first arc extinguishing zone and the second arc extinguishing zone respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of a bidirectional DC arc extinguishing structure of the utility model.

[0024] Figure 2 It is a schematic diagram of a magnetic conductor of a bidirectional DC arc extinguishing structure of the utility model.

[0025] Figure 3 The utility model is a schematic diagram of the assembly of a magnetic conductor, a permanent magnet, an arc isolation wall and a moving arc angle of a bidirectional DC arc extinguishing structure.

[0026] Figure 4 The utility model is a schematic diagram of arc extinguishing space distribution of a bidirectional DC arc extinguishing structure.

[0027] Among them, 1 is the moving contact, 2 is the static contact, 3 is the moving arc angle, 31 is the arc-initiating part, 32 is the moving arc driving part, 33 is the first arc burning part, 34 is the second arc burning part, 4 is the static arc angle, 41 is the arc-initiating part, 42 is the static arc driving part, 43 is the arc burning part, 5 is the arc isolation wall, 51 is the first arc isolation wall, 52 is the second arc isolation wall, 53 is the arc driving part, 54 is the arc extinguishing part, 6 is the magnetic conductor, 61 is the first arc-shaped side wall, 62 is the second arc-shaped side wall, 63 is the connecting bottom, 7 is the permanent magnet, 8 is the grid arc extinguishing chamber, 101 is the arc-initiating area, 102 is the arc driving area, 103 is the first arc extinguishing area, and 104 is the second arc extinguishing area. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. It should be noted that, unless otherwise defined, all technical and scientific terms used in this article have the same meaning as those generally understood by technicians in the technical field of the utility model. It should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances. The terms used in this article in the specification of the utility model are only for the purpose of describing specific embodiments, and are not intended to limit the utility model.

[0029] It should also be noted that in the description of the present invention, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They 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. Therefore, they cannot be understood as limitations on the present invention.

[0030] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments.

[0031] Embodiment 1

[0032] See also Figure 1 A bidirectional DC arc extinguishing structure comprises a moving contact 1, a stationary contact 2, a moving arc angle 3, a stationary arc angle 4, an arc separation wall 5, a magnetic conductor 6, a permanent magnet 7, and a grid arc extinguishing chamber 8;

[0033] Wherein, the static arc angle 4 is fixedly connected to the static contact 2, and the static arc angle 4 has an arc striking portion 41, a static arc driving portion 42 and an arc burning portion 43, and the arc striking portion 41, the static arc driving portion 42 and the arc burning portion 43 are arranged in sequence along the static contact 2 toward the grid arc extinguishing chamber 8, and the moving arc angle 3 is connected to the moving contact 1 through a soft wire, and the moving arc angle 3 has an arc attracting portion 31, a moving arc driving portion 32, a first arc burning portion 33 and a second arc burning portion 34, and the arc attracting portion 31, the moving arc driving portion 32, the first arc burning portion 33 and the second arc burning portion 34 are arranged in sequence along the moving contact 1 toward the grid arc extinguishing chamber 8, and the static arc angle 4 is arranged opposite to the moving arc angle 3;

[0034] See also Figure 1 and Figure 4 , the arc striking portion 41 of the static arc angle 4 and the arc attracting portion 31 of the moving arc angle 3 constitute an arc striking zone 101, the static arc driving portion 42 of the static arc angle 4 and the moving arc driving portion 32 of the moving arc angle 3 and the first arc burning portion respectively constitute an arc driving zone 102 and a first arc extinguishing zone 103, and the arc burning portion 43 of the static arc angle 4 and the second arc burning portion 34 of the moving arc angle 3 constitute a second arc extinguishing zone 104;

[0035] See also Figure 1 , Figure 3 and Figure 4 The arc isolation wall 5 includes a first arc isolation wall 51 and a second arc isolation wall 52 which are symmetrical in structure and are arranged on both sides of the arc striking zone 101, the arc driving zone 102 and the first arc extinguishing zone 103. The first arc isolation wall 51 and the second arc isolation wall 52 both have an arc driving portion 53 and an arc extinguishing portion 54. The arc driving portions 53 of the first arc isolation wall 51 and the second arc isolation wall 52 cover both sides of the arc striking zone 101 and the arc driving zone 102, and the arc extinguishing portions 54 of the first arc isolation wall 51 and the second arc isolation wall 52 cover both sides of the first arc extinguishing zone 103.

[0036] See also Figure 1 , Figure 2 and Figure 3 The magnetic conductor 6 has a symmetrical first arc-shaped side wall 61, a second arc-shaped side wall 62, and a connecting bottom 63. The first arc-shaped side wall 61 is arranged on the back of the arc driving portion 53 of the first arc-isolating wall 51, and the second arc-shaped side wall 62 is arranged on the back of the arc driving portion 53 of the second arc-isolating wall 52. The magnetic conductor 6 is sleeved on the moving arc angle 3, with the opening facing the static arc angle 4, and the connecting bottom 63 is close to the moving arc driving portion 32 of the moving arc angle 3;

[0037] The permanent magnet 7 is arranged between the connection bottom 63 of the magnetizer 6 and the moving arc driving portion 32 of the moving arc angle 3, the first polarity surface of the permanent magnet 7 contacts the connection bottom 63 of the magnetizer 6, and the second polarity surface of the permanent magnet 7 contacts the moving arc driving portion 32 of the moving arc angle 3;

[0038] The grid arc extinguishing chamber 8 is located between the arc burning portion 43 of the static arc angle 4 and the second arc burning portion 34 of the dynamic arc angle 3, and has a plurality of metal grids 81 separated from each other.

[0039] Preferably, see Figure 1 , Figure 2 and Figure 4 One end of the first arc-shaped side wall 61 and the second arc-shaped side wall 62 of the magnetic conductor 6 extends to the area between the moving contact 1 and the stationary contact 2, or exceeds the area between the moving contact 1 and the stationary contact 2, and the other end extends to the interface between the arc driving zone 102 and the first arc extinguishing zone 103, or slightly exceeds the interface and does not exceed the first arc extinguishing zone 103.

[0040] Preferably, the arc isolation wall 5 is made of high temperature resistant gas-generating insulating material, which generates gas under arc ablation, such as polytetrafluoroethylene (PTFE), polyoxymethylene (POM) or nylon (PA66) and the like.

[0041] Preferably, the grids of the grid arc extinguishing chamber 8 are of unequal length structure, the grids corresponding to the first arc extinguishing zone 103 are shorter, and one end of them is connected to the first arc extinguishing zone 103, the grids corresponding to the arc driving zone 102 are longer, and one end of them is connected to the arc driving zone 102, and the other ends of all the grids are flush.

[0042] Preferably, the magnetizer 6 and the moving arc angle 3 are made of magnetic ferromagnetic materials, such as iron, cobalt, and nickel, and the static arc angle 4 is made of conductive metal materials, such as copper and iron.

[0043] The utility model also provides a DC switch having any one of the bidirectional DC arc extinguishing structures described above.

[0044] The principle of a bidirectional DC arc extinguishing structure provided by the utility model is:

[0045] First, the first polarity surface of the permanent magnet 7 contacts the bottom 63 connected to the magnetizer 6. After the magnetizer 6 is magnetized, the first arc-shaped side wall 61 and the second arc-shaped side wall 62 of the magnetizer 6 show the same polarity as the first polarity surface of the permanent magnet 7, and the end magnetic fields of the first arc-shaped side wall 61 and the second arc-shaped side wall 62 are relatively strong. On the other hand, the second polarity surface of the permanent magnet 7 contacts the moving arc driving arc portion 32 of the moving arc angle 3, so that the moving arc angle 3 is magnetized, and the part of the moving arc angle 3 facing the static arc angle 4 will show the same polarity as the second polarity surface of the permanent magnet 7. In summary, in the space formed by the static arc angle 4, the dynamic arc angle 3, the first arc-shaped side wall 61 and the second arc-shaped side wall 62 of the magnetizer 6, the magnetic field has a magnetic field component pointing from the first arc-shaped side wall 61 to the dynamic arc angle 3, a magnetic field component pointing from the second arc-shaped side wall 62 to the dynamic arc angle 3, and a magnetic field component pointing from the first arc-shaped side wall 61 to the second arc-shaped side wall 62 exists near the first arc-shaped side wall 61, and a magnetic field component pointing from the second arc-shaped side wall 62 to the first arc-shaped side wall 61 exists near the second arc-shaped side wall 62. When the circuit breaker interrupts the current, the dynamic contact 1 separates from the static contact 2 to generate an arc, and the arc current will be deflected to one side wall of the magnetizer 6 under the action of the magnetic field above, and move toward the grid arc extinguishing chamber 8 under the action of the magnetic field near the side wall; if the arc current is opposite, the arc will be deflected to the other side wall of the magnetizer 6, and also move toward the grid arc extinguishing chamber 8 under the action of the magnetic field near the side wall;

[0046] 2. When the electric arc moves out of the end of the arc-shaped side wall of the magnetizer 6 and enters the first arc extinguishing zone 103, the magnetic field generated by the magnetizer 6 in this area is weakened, especially the magnetic field component perpendicular to the side wall near the side wall of the magnetizer 6 disappears, and the arc near the side wall of the magnetizer 6 will produce a movement stagnation phenomenon in the first arc extinguishing zone 103, but the magnetic field component parallel to the side wall of the magnetizer 6 will still act on the arc, driving the arc close to the arc isolation wall 5. The arc burns the material of the arc isolation wall 5, which will generate local pressure enhancement and produce a cooling effect on the arc, thereby increasing the resistance of the arc, increasing the arc voltage, and extinguishing the arc with a smaller current in the first arc extinguishing zone 103;

[0047] 3. When the current is large, the magnetic field generated by the current on the static arc angle 4 has a stronger effect on driving the static arc root to move toward the arc extinguishing chamber, and the magnetic field generated by the current on the moving arc angle 3 has a stronger effect on driving the moving arc root to move toward the arc extinguishing chamber. At the same time, the magnetic field generated by the current in the arc column area and the airflow field generated by the local pressure increase have a stronger driving effect on the arc column of the arc toward the arc extinguishing chamber. The combined effect causes the high-current arc to pass through the first arc burning zone 103 and enter the second arc burning zone 104. Relying on the cutting and cooling effect of the grid arc extinguishing chamber 8 on the arc, the arc voltage increases, forcing the arc current to pass through zero, and then extinguish the arc.

[0048] Embodiment 2

[0049] See also Figure 1 A bidirectional DC arc extinguishing structure comprises a moving contact 1, a stationary contact 2, a moving arc angle 3, a stationary arc angle 4, an arc separation wall 5, a magnetic conductor 6, a permanent magnet 7 and a grid arc extinguishing chamber 8, wherein the moving contact 1 is connected to the moving arc angle 3, a soft wire is connected between the moving arc angle 3 and the moving contact 1, one end of the stationary contact 2 overlaps and connects with one end of the stationary arc angle 4, one side of the moving arc angle 3 is arranged opposite to one side of the stationary arc angle 4, an arc extinguishing space is formed between one side of the moving arc angle 3 and one side of the stationary arc angle 4, and the grid arc extinguishing chamber 8 is in the arc extinguishing space One end of the moving contact 1 and the static contact 2 is arranged between the grid arc extinguishing chamber 8 and one end of the grid arc extinguishing chamber 8, one end of the side wall of the magnetizer 6 overlaps and connects with one side of the arc isolation wall 5, the other end of the side wall of the magnetizer 6 overlaps and connects with the other side of the arc isolation wall 5, the permanent magnet 7 is installed between the other side of the moving arc angle 3 and the bottom of the magnetizer 6, one side of the arc isolation wall 5 is arranged between one side of the grid arc extinguishing chamber 8 and one side of the moving arc angle 3, and the other side of the arc isolation wall 5 is arranged between one end of the moving contact 1 and one end of the static contact 2 or exceeds the other end of the moving contact 1 and the other end of the static contact 2.

[0050] The moving arc angle 3 comprises an arcing portion 31, a moving arc driving portion 32, a first arc burning portion 33 and a second arc burning portion 34, one end of the arcing portion 31 is connected to the moving contact 1, one side of the arcing portion 31 is in contact with one side of the permanent magnet 7, the other end of the arcing portion 31 is connected to one end of the moving arc driving portion 32, one side of the moving arc driving portion 32 and the other end of the moving arc driving portion 32 are connected to one end of the first arc burning portion 33, and one end of the first arc burning portion 33 is connected to the second arc burning portion 34;

[0051] The static arc angle 4 includes an arc striking portion 41, a static arc driving portion 42 and an arc burning portion 43, one end of the arc striking portion 41 is connected to one end of the static arc driving portion 42, the same side of the arc striking portion 41 and the static arc driving portion 42 is fixedly connected to one side of the static contact 2, and the other end of the static arc driving portion 42 is connected to one end of the arc burning portion 43;

[0052] The grid arc extinguishing chamber 8 is installed between the second arc burning portion 34 and the arc burning portion 43 , and the other end of the arc separation wall 5 is arranged between one side of the grid arc extinguishing chamber 8 and one side of the first arc burning portion 33 .

[0053] See also Figure 1 and Figure 4 The arc extinguishing space is provided with an arc striking zone 101, an arc driving zone 102, a first arc extinguishing zone 103 and a second arc extinguishing zone 104. The arc striking zone 101 is distributed between the arc striking portion 41 and the arc striking portion 31, the arc driving zone 102 is distributed between the static arc driving portion 42 and the moving arc driving portion 32, the first arc extinguishing zone 103 is distributed between the static arc driving portion 42 and the first arc burning portion 33, and the second arc extinguishing zone 104 is distributed between the arc burning portion 43 and the second arc burning portion 34.

[0054] The grid arc extinguishing chamber 8 is provided with a plurality of metal grids 81 spaced apart from each other, the metal grids 81 include a long metal grid and a short metal grid, one end of the long metal grid is flush with one end of the short metal grid, the other end of the long metal grid is connected to the arc driving zone 102, and the other end of the short metal grid is connected to the first arc extinguishing zone 103.

[0055] See also Figure 1 and Figure 3 The arc isolation wall 5 is provided with an arc driving part 53 and an arc extinguishing part 54. The arc driving part 53 is distributed on both sides of the arc striking zone 101 and the arc driving zone 102. The arc extinguishing part 54 is distributed on both sides of the first arc extinguishing zone 103. The arc isolation wall 5 includes a first arc isolation wall 51 and a second arc isolation wall 52. The first arc isolation wall 51 and the second arc isolation wall 52 are symmetrically arranged on both sides of the arc striking zone 101, the arc driving zone 102 and the first arc extinguishing zone 103.

[0056] See also Figure 1 and Figure 2 The magnetic conductor 6 includes a first arcuate side wall 61, a second arcuate side wall 62 and a connecting bottom 63. The first arcuate side wall 61 and the second arcuate side wall 62 are symmetrically arranged. The connecting bottom 63 is U-shaped. One end of the first arcuate side wall 61 is connected to one end of the U-shaped opening of the connecting bottom 63, and one end of the second arcuate side wall 62 is connected to the other end of the U-shaped opening of the connecting bottom 63.

[0057] See also Figure 1 , Figure 2 and Figure 3 The first arc-shaped side wall 61 is arranged on the inner side of the arc driving part 53 of the first arc isolation wall 51, and the second arc-shaped side wall 62 is arranged on the inner side of the arc driving part 53 of the second arc isolation wall 52. The moving arc angle 3 is installed inside the magnetic conductor 6, and the U-shaped opening of the connecting bottom 63 faces the static arc angle 4. The connecting bottom 63 is arranged opposite to the moving arc driving part 32. The permanent magnet 7 is installed between the connecting bottom 63 and the moving arc driving part 32. The first polarity surface of the permanent magnet 7 contacts the connecting bottom 63, and the second polarity surface of the permanent magnet 7 contacts the moving arc driving part 32.

[0058] Preferably, the arc isolation wall 5 is made of a high temperature resistant gas-generating insulating material, and the high temperature resistant gas-generating insulating material includes polytetrafluoroethylene, polyoxymethylene or nylon.

[0059] Preferably, the magnetizer 6 and the moving arc angle 3 are made of a magnetic ferromagnetic material, which includes iron, cobalt or nickel, and the static arc angle 4 is made of a conductive metal material, which includes copper or iron.

[0060] A DC switch has any one of the above bidirectional DC arc extinguishing structures.

[0061] The above content is only for explaining the technical idea of ​​the utility model and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. A bidirectional DC arc extinguishing structure, characterized in that: The invention comprises a moving contact (1), a stationary contact (2), a moving arc angle (3), a stationary arc angle (4), an arc separation wall (5), a magnetic conductor (6), a permanent magnet (7) and a grid arc extinguishing chamber (8); the moving contact (1) is connected to the moving arc angle (3); a soft wire is connected between the moving arc angle (3) and the moving contact (1); one end of the stationary contact (2) overlaps and connects with one end of the stationary arc angle (4); one side of the moving arc angle (3) and one side of the stationary arc angle (4) are arranged opposite to each other; an arc extinguishing space is formed between one side of the moving arc angle (3) and one side of the stationary arc angle (4); and the grid arc extinguishing chamber (8) is located in the arc extinguishing space. The permanent magnet (7) is installed between the other side of the moving arc angle (3) and the bottom of the magnet (6); one side of the arc isolation wall (5) is arranged between one side of the grid arc extinguishing chamber (8) and one side of the moving arc angle (3); and the other side of the arc isolation wall (5) is arranged between one end of the moving contact (1) and one end of the stationary contact (2) or exceeds the other end of the moving contact (1) and the other end of the stationary contact (2).

2. A bidirectional DC arc extinguishing structure according to claim 1, characterized in that: The moving arc angle (3) comprises an arcing portion (31), a moving arc driving portion (32), a first arc burning portion (33) and a second arc burning portion (34); one end of the arcing portion (31) is connected to the moving contact (1); one side of the arcing portion (31) is in contact with one side of the permanent magnet (7); the other end of the arcing portion (31) is connected to one end of the moving arc driving portion (32); one side of the moving arc driving portion (32) and the other end of the moving arc driving portion (32) are connected to one end of the first arc burning portion (33); and one end of the first arc burning portion (33) is connected to the second arc burning portion (34); The static arc angle (4) comprises an arc striking portion (41), a static arc driving portion (42) and an arc burning portion (43), one end of the arc striking portion (41) is connected to one end of the static arc driving portion (42), the same side of the arc striking portion (41) and the static arc driving portion (42) is fixedly connected to one side of the static contact (2), and the other end of the static arc driving portion (42) is connected to one end of the arc burning portion (43); The grid arc extinguishing chamber (8) is installed between the second arc burning portion (34) and the arc burning portion (43), and the other end of the arc isolation wall (5) is arranged between one side of the grid arc extinguishing chamber (8) and one side of the first arc burning portion (33).

3. A bidirectional DC arc extinguishing structure according to claim 2, characterized in that: The arc extinguishing space is provided with an arc striking zone (101), an arc driving zone (102), a first arc extinguishing zone (103) and a second arc extinguishing zone (104); the arc striking zone (101) is distributed between the arc striking portion (41) and the arc striking portion (31); the arc driving zone (102) is distributed between the static arc driving portion (42) and the dynamic arc driving portion (32); the first arc extinguishing zone (103) is distributed between the static arc driving portion (42) and the first arc burning portion (33); and the second arc extinguishing zone (104) is distributed between the arc burning portion (43) and the second arc burning portion (34).

4. A bidirectional DC arc extinguishing structure according to claim 3, characterized in that: The grid arc extinguishing chamber (8) is provided with a plurality of metal grids (81) spaced apart from each other, the metal grids (81) comprising a long metal grid and a short metal grid, one end of the long metal grid is flush with one end of the short metal grid, the other end of the long metal grid is connected to the arc driving zone (102), and the other end of the short metal grid is connected to the first arc extinguishing zone (103).

5. A bidirectional DC arc extinguishing structure according to claim 3, characterized in that: The arc isolation wall (5) is provided with an arc driving part (53) and an arc extinguishing part (54), the arc driving part (53) is distributed on both sides of the arc striking zone (101) and the arc driving zone (102), and the arc extinguishing part (54) is distributed on both sides of the first arc extinguishing zone (103), the arc isolation wall (5) comprises a first arc isolation wall (51) and a second arc isolation wall (52), and the first arc isolation wall (51) and the second arc isolation wall (52) are symmetrically arranged on both sides of the arc striking zone (101), the arc driving zone (102), and the first arc extinguishing zone (103).

6. A bidirectional DC arc extinguishing structure according to claim 5, characterized in that: The magnetic conductor (6) comprises a first arc-shaped side wall (61), a second arc-shaped side wall (62) and a connecting bottom (63); the first arc-shaped side wall (61) and the second arc-shaped side wall (62) are symmetrically arranged; the connecting bottom (63) is U-shaped; one end of the first arc-shaped side wall (61) is connected to one end of the U-shaped opening of the connecting bottom (63); and one end of the second arc-shaped side wall (62) is connected to the other end of the U-shaped opening of the connecting bottom (63).

7. A bidirectional DC arc extinguishing structure according to claim 6, characterized in that: The first arc-shaped side wall (61) is arranged on the inner side of the arc driving portion (53) of the first arc isolation wall (51), and the second arc-shaped side wall (62) is arranged on the inner side of the arc driving portion (53) of the second arc isolation wall (52). The moving arc angle (3) is installed inside the magnetic conductor (6), and the U-shaped opening of the connecting bottom (63) faces the static arc angle (4). The connecting bottom (63) is arranged opposite to the moving arc driving portion (32). The permanent magnet (7) is installed between the connecting bottom (63) and the moving arc driving portion (32). The first polarity surface of the permanent magnet (7) contacts the connecting bottom (63), and the second polarity surface of the permanent magnet (7) contacts the moving arc driving portion (32).

8. The bidirectional DC arc extinguishing structure according to claim 1, characterized in that: The arc isolation wall (5) is made of a high temperature resistant gas generating insulating material, and the high temperature resistant gas generating insulating material includes polytetrafluoroethylene, polyoxymethylene or nylon.

9. A bidirectional DC arc extinguishing structure according to claim 1, characterized in that: The magnetic conductor (6) and the moving arc angle (3) are made of a magnetic ferromagnetic material, wherein the magnetic ferromagnetic material comprises iron, cobalt or nickel, and the static arc angle (4) is made of a conductive metal material, wherein the conductive metal material comprises copper or iron.

10. A DC switch, characterized in that: A bidirectional DC arc extinguishing structure as claimed in any one of claims 1 to 9.

Images