CN220253120U - Arc extinguishing structure - Google Patents

Abstract

The utility model provides an arc extinguishing structure, including two stationary contacts, moving contact and two explosion chambers, the moving contact is including installing the contact on the contact support, the stationary contact is equipped with first contact portion, the both ends of contact are equipped with second contact portion, the contact support can linear movement drive two second contact portions of contact and the first contact portion contact or the separation of two stationary contacts, two explosion chambers set up in the both sides of the contact area of two second contact portions and the first contact portion of two stationary contacts, including two sets of permanent magnets, two sets of permanent magnets correspond two stationary contacts and two explosion chambers setting respectively, every permanent magnet of set includes parallel interval setting first permanent magnet and second permanent magnet, the region between first permanent magnet and the second permanent magnet is equipped with the explosion chamber that corresponds at least, the first contact portion of stationary contact, the second contact portion of moving contact, utilize the magnetic field to drive the electric arc to the direction of explosion chamber, accelerate the electric arc and get into the explosion chamber.

Description

Arc extinguishing structure

Technical Field

The invention relates to the field of piezoelectric devices, in particular to a switching device.

Background

Along with the continuous promotion of new energy automobile's power, current rating of current direct current switch for new energy automobile is higher and higher, has put forward higher requirement to the arc extinguishing structure of switch. The arc extinguishing efficiency of the arc extinguishing structure of the existing direct current switch is low, the speed of an arc entering an arc extinguishing chamber is low, and particularly under the condition of conventional small current, the arc is not easy to extinguish rapidly, so that the time of burning a moving contact and a static contact by the arc is long, and the service life is influenced.

Disclosure of Invention

The utility model aims to overcome at least one defect in the prior art and provide an arc extinguishing structure of a switching device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an arc extinguishing structure, including two stationary contacts, moving contact and two explosion chambers, the moving contact is including installing the contact on the contact support, the stationary contact is equipped with first contact portion, the both ends of contact are equipped with second contact portion, the contact support can rectilinear movement drive two second contact portions of contact and the first contact portion contact or the separation of two stationary contacts, two explosion chambers set up in the both sides of the contact area of two second contact portions and the first contact portion of two stationary contacts, including two sets of permanent magnets, two sets of permanent magnets correspond two stationary contacts and two explosion chamber settings respectively, every permanent magnet of set includes parallel interval setting first permanent magnet and second permanent magnet, the region between first permanent magnet and the second permanent magnet is equipped with the explosion chamber that corresponds at least, the first contact portion of stationary contact, the second contact portion of moving contact.

Preferably, the first permanent magnet and the second permanent magnet of each set of permanent magnets are of opposite polarity.

Preferably, the polarities of the first permanent magnets of the two groups of permanent magnets are opposite, and the polarities of the second permanent magnets of the two groups of permanent magnets are opposite.

Preferably, the arc extinguishing structure further comprises two groups of magnetic conduction plates, and a group of magnetic conduction plates are arranged on the outer side of each group of permanent magnets.

Preferably, the magnetic conduction plate comprises a first magnetic conduction plate, a second magnetic conduction plate and a connecting plate, wherein the first magnetic conduction plate and the second magnetic conduction plate are arranged in parallel, and the connecting plate is connected with the first magnetic conduction plate and the second magnetic conduction plate.

Preferably, the first magnetic conduction plate and the second magnetic conduction plate are respectively and correspondingly arranged on the outer sides of the first permanent magnet and the second permanent magnet, the connecting plate is arranged corresponding to the lower side of the arc extinguishing chamber, the exhaust end of the arc extinguishing chamber is avoided, and the connecting plate is connected with the side edges of the first magnetic conduction plate and the second magnetic conduction plate, which are close to the corresponding fixed contact.

Preferably, the fixed contact is provided with a first arc striking part, and the first arc striking part is connected with the first contact part and extends to one side of the corresponding arc extinguishing chamber in the direction of the corresponding arc extinguishing chamber.

Preferably, a third arc striking part is arranged on the contact, and the third arc striking part is connected with the second contact part and extends towards the direction of the corresponding arc extinguishing chamber.

Preferably, the static contact is further provided with a second arc striking part, and the second arc striking part is connected with the first contact part and extends in a direction opposite to the extending direction of the first arc striking part.

Preferably, the contact comprises a second connecting part, two second contact parts and two second inclined parts, wherein the two second contact parts are respectively connected with two ends of the second connecting part through the two second inclined parts, the inclined planes of the second inclined parts are opposite to the second striking part, and the inclined planes of the second inclined parts and the second striking part are inclined in the directions away from each other.

Preferably, the static contact comprises a first contact part, a first connecting part and a first wiring part, wherein the first contact part, the first connecting part and the first wiring part are sequentially connected into a C-shaped structure, the first contact part and the first wiring part are arranged in a spaced opposite way, two ends of the first connecting part are respectively connected with one ends of the first contact part and the first wiring part, and a first avoiding hole is formed in the first connecting part; the openings of the C-shaped structures of the two static contacts are arranged in opposite directions, the openings face the corresponding arc-extinguishing chambers, and the second contact parts at the two ends of the contacts respectively penetrate through the first avoidance holes of the two static contacts to be matched with the first contact parts.

Preferably, both the fixed contacts are located on the same side of the moving contact.

Preferably, the static contacts comprise a first contact part, a first connecting part and a first wiring part, the first contact part, the first connecting part and the first wiring part are sequentially connected into a C-shaped structure, the openings of the C-shaped structures of the two static contacts are arranged in opposite directions, and the openings face towards the corresponding arc-extinguishing chambers; the first contact portion, the first connection portion and the first wiring portion are all located on the same side of the contact.

The invention creates a magnetic blowing structure of an arc extinguishing structure, which is provided with two groups of permanent magnets, is suitable for the structure of two fixed contacts and two arc extinguishing chambers, the two groups of permanent magnets are respectively arranged corresponding to the two fixed contacts and the two arc extinguishing chambers, and the magnetic field is utilized to drive the electric arc to the direction of the arc extinguishing chambers so as to accelerate the electric arc to enter the arc extinguishing chambers.

In addition, the polarities of the first permanent magnet A and the second permanent magnet B of each group of permanent magnets are opposite, and the polarities of the first permanent magnets A and the second permanent magnets B of the two groups of permanent magnets are opposite, so that when small current is switched on and off, one side of the switching arc is driven towards a corresponding arc extinguishing chamber, and the other side of the switching arc is driven towards the corresponding arc extinguishing chamber in a reverse way, and the application without polarity can be realized; when the high current is cut off, the arc is excited by the magnetic field of the conductive loop, so that the cut-off arcs at two sides respectively move to the two arc extinguishing chambers, and the arc extinguishing speed can be improved.

In addition, two groups of magnetic conduction plates are arranged, and a group of magnetic conduction plates are arranged on the outer side of each group of permanent magnets, so that electromagnetic magnetic field excitation is improved.

In addition, the run-out structure of the arc extinguishing structure guides the arc to the arc extinguishing chamber, and the arc can be pulled longer, so that the utilization rate of the arc extinguishing chamber is higher, and the run-out structure can be used for a switch with higher rated current.

In addition, the C-shaped structure of the fixed contact, the structure that the contact passes through the first avoidance hole and the arrangement of the second inclined part of the contact are beneficial to improving the arc striking effect of the arc running structure and the driving force of the excitation magnetic field of the conductive loop of the fixed contact of the magnetic blowing structure.

Drawings

Fig. 1 is a schematic structural view of a switching device assembled by a contact unit and an electromagnetic unit of the present embodiment;

fig. 2 is a schematic exploded view of the contact unit and the electromagnetic unit of the present embodiment;

fig. 3 is a schematic view of the internal structure of the electromagnetic unit of the present embodiment;

fig. 4 is a schematic view of the internal structure of the contact unit of the present embodiment;

fig. 5 is a schematic view of the internal structure of the contact unit of the present embodiment;

FIG. 6 is a schematic diagram of an arc running structure of the present embodiment;

fig. 7 is a sectional view of the moving contact and the fixed contact of the present embodiment;

fig. 8 is a schematic structural view of the stationary contact of the present embodiment;

FIG. 9 is a schematic diagram of the current loop path at the time of opening;

FIG. 10 is a schematic diagram of the current loop path at the initial stage of opening the switch;

FIG. 11 is a schematic diagram of the current loop path at the subsequent stage of opening;

fig. 12 is a schematic view of an assembled structure of the contact unit of the present embodiment;

fig. 13 is a cross-sectional view of the contact unit of the present embodiment;

fig. 14 is a schematic view of the magnetic blow-through structure of the contact unit of the present embodiment;

FIG. 15 is a schematic diagram of the effect of a magnetic blow-off structure on an arc when the on-current is small;

FIG. 16 is a schematic diagram of the magnetic blow-off structure acting on an arc when the on-current is large;

FIG. 17 is a schematic diagram of the action of the excitation field of the moving and stationary contact conductive loop on the arc;

Fig. 18 is a schematic view of an assembled structure of a contact unit of another embodiment.

The elements in the figures are numbered as follows:

the contact unit 1, the contact unit housing 10, the first linking hole 101, the exhaust port 102, the power supply wiring portion 103, the partition protrusion 104, the second protrusion 105, the fixed contact 11, the first fixed contact 11A, the second fixed contact 11B, the first contact portion 111, the first connection portion 112, the first wiring portion 113, the first striking portion 114, the second striking portion 115, the first escape hole 116, the first arc surface 1114, the second arc surface 1115, the first inclined section 1141, the first straight section 1142, the moving contact 12, the contact 120, the second contact portion 121, the third striking portion 122, the second connection portion 123, the contact support 124, the contact mounting groove 1241, the spring mounting groove 1242, the baffle 1243, the slide groove 1244, the connection portion 1245, the second inclined portion 125 the contact spring 126, the first arc guide 13, the first arc guide 131, the third connection 132, the second arc guide 133, the second straight section 1301, the second inclined section 1302, the third straight section 1303, the arc extinguishing chamber 14, the magnetic conductive plate 17, the first magnetic conductive plate 171, the second magnetic conductive plate 173, the connection plate 172, the permanent magnet 18, the first permanent magnet 18A, the second permanent magnet 18B, the first permanent magnet plate 181, the second permanent magnet plate 182, and the third permanent magnet plate 183, the electromagnetic unit 2, the electromagnetic unit housing 20, the electromagnetic coil 21, the stationary core 23, the moving core 22, the return spring 24, the link lever 25, the second link hole 201, the first base H1, the second base H2, the first partition H3, the second partition H4, and the first outer groove H341.

Detailed Description

The following examples are given in connection with the accompanying drawings to further illustrate specific embodiments of the switching device according to the invention. The switching device of the present invention is not limited to the description of the following embodiments.

Referring to fig. 3-4, the switching device includes a contact mechanism and an electromagnetic mechanism; the electromagnetic mechanism comprises an electromagnetic coil 21, a static iron core 23, a movable iron core 22 and a return spring 24, wherein the electromagnetic coil 21 is used for generating electromagnetic force to drive the movable iron core 22 to move towards the static iron core 23, and the return spring 24 acts on the movable iron core 22; when the electromagnetic coil 21 is in conductive operation, electromagnetic force is generated to drive the movable iron core 22 to move and attract towards the static iron core 23, the movable iron core 22 enables the return spring 24 to store energy, and when the electromagnetic coil 21 stops operating, the return spring 24 pushes the movable iron core 22 to move away from the static iron core 23 in the process of restoring deformation. The contact mechanism comprises a fixed contact 11 and a movable contact 12, a movable iron core 22 of the electromagnetic mechanism can drive the movable contact 12 to move, so that the movable contact 12 is contacted with and separated from the fixed contact 11, and the contact mechanism is used for realizing switching on and switching off of a switching device, which is the prior art in the field.

As shown in fig. 1 to 4, an embodiment of the switching device of the present invention is a dc switch, and an improvement of the switching device of the present embodiment is that, in a modular design, the switching device includes an electromagnetic unit 2 and at least one contact unit 1 arranged side by side, the electromagnetic unit 2 includes an electromagnetic unit housing 20, and an electromagnetic coil 21, a stationary core 23, a moving core 22 and a return spring 24 arranged in the electromagnetic unit housing 20; the contact unit 1 comprises a contact unit shell 10, a fixed contact 11, a movable contact 12 and an arc extinguishing chamber 14 which are arranged in the contact unit shell 10, wherein the arc extinguishing chamber 14 is used for extinguishing an arc generated by breaking the fixed contact 11 and the movable contact 12. A first linkage hole 101 is provided in a side wall of the contact unit case 10, a second linkage hole 201 is provided on a side wall of the electromagnetic unit case 20, which is in close contact with the contact unit case 10, and a linkage rod 25 passes through the first linkage hole 101 and the second linkage hole 201 to connect the moving core 22 with the moving contact 12.

The switch device of this embodiment adopts the modularized design, divide into independent contact unit 1 and electromagnetic unit 2, link the movable iron core 22 of electromagnetic unit 2 with the movable contact 12 of contact unit 1 through gangbar 25, adopt solenoid drive easily control, assemble the contact unit 1 of different pole numbers and specification according to the user's demand, constitute the switch device of multiple specification with electromagnetic unit 2, the suitability is high and be convenient for assemble, maintain and change. Furthermore, the contact unit 1 and the electromagnetic unit 2 are preferably arranged side by side in the width direction, and the height dimension of the switch device can be greatly reduced relative to the stacking arrangement in the height direction, which is particularly beneficial for being used in products with limited space such as automobiles.

The switch device of the present embodiment includes one electromagnetic unit 2 and two contact units 1, the two contact units 1 are respectively disposed on the left and right sides of the width direction of the electromagnetic unit 2, so as to balance the driving force of the electromagnetic unit 2, and the linkage rod 25 connects the moving core 22 and the contact supports of the two contact units 1. The two contact units 1 may be disposed on the same side of the electromagnetic unit 2, and the movable contacts 12 of the adjacent contact units 1 may be connected by the link lever 25. In addition, the switching device may be provided with only one contact unit 1, or three or more contact units, as desired. In addition, the linkage rod 25 may be directly or indirectly connected to the moving core 22 and the moving contact 12; the link lever 25 may be a separate member or may be provided as a part of the moving core 22 or the moving contact 12.

As shown in fig. 3, the electromagnetic unit 2 of the present embodiment includes an electromagnetic unit housing 20, an electromagnetic coil 21, a stationary core 23, a moving core 22 and a return spring 24 that are disposed in the electromagnetic unit housing 20, the stationary core 23 is fixedly disposed in the electromagnetic unit housing 20, the moving core 22, the electromagnetic coil 21 and the stationary core 23 are disposed in this order, and may be mounted on the stationary core 23, the moving core 22 is disposed opposite to the stationary core 23, and is capable of moving linearly in the electromagnetic unit housing 20 in a direction approaching to and separating from the stationary core 23, the return spring 24 is disposed between the moving core 22 and the stationary core 23, a link lever 25 is disposed on the moving core 22, and a second link hole 201 is disposed on a side wall of the electromagnetic unit housing 20 for extending and driving a link lever 25 connected with the moving core 22 to drive the moving contact 12. It should be noted that, the stationary core 23 and the movable core 22 may be configured as U-shaped, E-shaped, or other structures as required, the return spring 24 may be a compression spring, a torsion spring, a leaf spring, or the like, and the electromagnetic coil 21 may be one or two or more, which falls within the protection scope of the present invention. The electromagnetic unit 2 adopts a modularized design, is convenient to assemble, can be configured according to different specifications according to different application scenes, and only needs to ensure that the interface matched with the linkage rod 25 is unified.

As shown in fig. 4, the contact unit 1 of the present embodiment includes a fixed contact 11, a moving contact 12 and an arc extinguishing chamber 14 that are disposed in a contact unit housing 10, and the contact mechanism of the present embodiment is a bridge type double-break contact, including a moving contact 12 and two fixed contacts 11, the two fixed contacts 11 are a first fixed contact 11A and a second fixed contact 11B, respectively, the moving contact 12 includes a contact 120, both ends of the contact 120 are provided with second contact portions 121, and the two second contact portions 121 are used for being mated with the two fixed contacts 11. The moving contact 12 includes a contact 120, a contact support 124, and a contact spring 126, where the contact support 124 can move linearly in the contact unit housing 10, the contact 120 is mounted on the contact support 124, and the contact spring 126 is disposed between the contact 120 and the contact support 124, and is used to fix the contact 120 on the contact support 124 and implement over-travel, so as to ensure reliable contact between the second contact portion 121 and the fixed contact 11. The two fixed contacts 11 are symmetrically arranged at two sides of the contact support 124, the two arc extinguishing chambers 14 are arranged at two sides of the moving contact 12, namely symmetrically arranged at two sides of the contact 120 and the contact support 124, and the two arc extinguishing chambers 14 are respectively arranged at two sides far away from the contact area of the moving contact 12 and the two fixed contacts 11 and symmetrically distributed. The contact support 124 is provided with a connecting hole 1245 for connecting with the linkage rod 25, the first linkage hole 101 corresponds to the contact support 124, and the first linkage hole 101 is used for passing through the linkage rod 25 connected with the contact support 124 to drive the contact support 124 to move linearly. The contact unit can be used for forming switching device with the concatenation of electromagnetic unit 2, be equipped with two static contacts 11, moving contact 12 and two explosion chambers 14 in the contact unit, be equipped with first linkage hole 101 on the lateral wall of contact unit casing 10 for the gangbar 25 passes and is connected with the contact support 124 of moving contact 12, and the contact unit suitability of this embodiment is high and be convenient for assemble and change, can change different specification configurations according to different application scenario, only need guarantee with gangbar 25 complex first linkage hole 101 and connecting hole 1245's interface unify can.

As shown in fig. 2, the first and second link holes 101 and 201 are elongated, and the link lever 25 is linearly movable in the first and second link holes 101 and 201, and the longitudinal directions of the first and second link holes 101 and 201 are parallel to the movement direction of the contact support 124.

When the electromagnetic coil 21 is in conductive work, electromagnetic force is generated to drive the movable iron core 22 to move and attract towards the static iron core 23, the movable iron core 22 drives the contact support 124 to move linearly through the linkage rod 25, the contact support 124 drives the contact 120 to move so that the second contact parts 121 at two ends are respectively in contact with the first static contact 11A and the second static contact 11B to realize switching on (can also realize switching off for separation), when the electromagnetic coil 21 stops working, the return spring 24 pushes the movable iron core 22 to move and repel away from the static iron core 23, the movable iron core 22 drives the contact support 124 to move linearly through the linkage rod 25, and the contact support 124 drives the contact 120 to move so that the second contact parts 121 at two ends are respectively in contact with the first static contact 11A and the second static contact 11B to realize switching off (can also realize switching on for contact).

Preferably, as shown in fig. 4-5, in the preferred embodiment of one contact unit 1, the contact support 124 is disposed in the middle of the contact unit 1, two arc extinguishing chambers 14 are symmetrically disposed on two sides of the contact support 124, two fixed contacts 11 are respectively disposed between the corresponding arc extinguishing chambers 14 and the contact support 124, and the fixed contacts 11 are disposed between the corresponding arc extinguishing chambers 14 and the contact support 124, so that the overall structure is more compact, and the arrangement of guiding the arc to the arc extinguishing chambers 14 and the power connection portion 103 of the contact unit 1 is facilitated. Of course, as other embodiments, the stationary contact 11 may be disposed on the upper side or the lower side of the arc extinguishing chamber 14.

Preferably, as shown in fig. 5-6, the arc extinguishing structure in the contact unit 1 of the present embodiment includes an arc running structure for guiding an arc generated during opening into two arc extinguishing chambers 14, the arc running structure is located between the contact area of the fixed contact 11 and the moving contact 12 and the arc extinguishing chambers 14, and the structure of the fixed contact 11 and the moving contact 12 will be described in further detail below.

As shown in fig. 5 to 6, the stationary contact 11 includes a first contact portion 111, a first connection portion 112, and a first wire connection portion 113, the first contact portion 111 is configured to mate with a second contact portion 121 of the contact 120, the first wire connection portion 113 is configured to connect to a power source, and the first connection portion 112 is connected between the first contact portion 111 and the first wire connection portion 113. Preferably, the fixed contact 11 is provided with a first avoidance hole 116 for the contact 120 to pass through, and the second contact portion 121 of the contact 120 passes through the first avoidance hole 116 to be matched with the first contact portion 111.

In this embodiment, the first contact portion 111, the first connection portion 112, and the first connection portion 113 are sequentially connected into a C-shaped structure, the first contact portion 111 and the first connection portion 113 are disposed opposite to each other at intervals, and are substantially parallel to each other, two ends of the first connection portion 112 are respectively connected with one ends of the first contact portion 111 and the first connection portion 113, a stationary contact is disposed on the first contact portion 111, a first connection hole is disposed on the first connection portion 113, and a first avoiding hole 116 is disposed on the first connection portion 112. The second contact portions 121 at two ends of the contact 120 respectively pass through the first avoidance holes 116 of the two fixed contacts 11 to be matched with the first contact portions 111 of the corresponding fixed contacts 11. The openings of the C-shaped structures of the two fixed contacts 11 are arranged in opposite directions, the openings face the corresponding arc extinguishing chambers 14, the two first connecting portions 112 are arranged in parallel at intervals, the two first wiring portions 113 extend in opposite directions, and the two first contact portions 111 extend in opposite directions; the second contact portion 121 of the contact 120 passes through the first avoidance hole 116 and is disposed between the first wiring portion 113 and the first contact portion 111, and the contact support 124 drives the contact 120 to move linearly, so that the first avoidance hole 116 avoids the movement of the contact 120. Preferably, the fixed contact 11 is integrally formed and bent by a conductive plate, and the first connection portion 113 extends out of the contact unit 1 to serve as a power connection portion 103 of the contact unit 1 for connecting a voltage and a load. In addition, the power connection part 103 may be further connected with a connection terminal, which is used for electrically connecting the contact unit with an external circuit, and the connection terminal may be in various types.

Preferably, the stationary contact 11 further includes a first striking portion 114 and a second striking portion 115, where the first striking portion 114 and the second striking portion 115 are connected to the first contact portion 111 and extend in opposite directions, respectively, the first striking portion 114 extends away from the first connecting portion 112, i.e. in a direction corresponding to the arc extinguishing chamber 14, and extends to the lower side of the corresponding arc extinguishing chamber 14, and the second striking portion 115 extends in a direction opposite to the extending direction of the first striking portion 114, i.e. in a direction in which the first connecting portion 112 is located, and passes through the first avoiding hole 116.

Preferably, the contact 120 is provided with a third striking portion 122, and the two third striking portions 122 are respectively connected to the two second contact portions 121 and extend in the direction corresponding to the arc extinguishing chamber 14. The contact 120 includes a second connection portion 123 and two second contact portions 121 connected to two ends of the second connection portion 123, a movable contact is disposed on the second contact portion 121, the contact 120 is mounted on a contact support 124 through the second connection portion 123, and two third striking portions 122 are connected to the two second contact portions 121 respectively and extend in directions away from each other.

Preferably, the second connecting portion 123 and the second contact portion 121 have a drop, the two second contact portions 121 are respectively connected to two ends of the second connecting portion 123 through two second inclined portions 125, and the inclined surfaces formed by the inclined second inclined portions 125 may enable the arc to be drawn longer. In particular, the inclined surface of the second inclined portion 125 is opposite to the second striking portion 115, so that the arc can be introduced between the inclined surface and the second striking portion 115 from the contact area of the moving contact and the fixed contact, and the arc can be drawn longer, thereby improving the utilization efficiency of the arc extinguishing chamber 14 and further improving the arc extinguishing effect. The second connection portion 123 and the second contact portion 121 have a drop height, and the second contact portion 121 is located at a smaller distance from the second connection portion 123 to the first contact portion 111 in the moving direction of the contact 120, and the inclined surface of the second inclined portion 125 and the second striking portion 115 each extend obliquely in a direction away from each other. The second inclined portion 125 and the second striking portion 115 may be used to cooperate with a contact mechanism provided with a permanent magnet, and cooperate with a magnetic field of the permanent magnet to guide an arc, so as to enhance arc extinguishing performance. Of course, as other embodiments, the second inclined portion 125 and/or the second striking portion 115 may not be provided.

Preferably, a first arc guiding member 13 is disposed on a side of the contact 120 away from the back side of the first contact portion 111 of the fixed contact 11, and the first arc guiding member 13 includes two arc guiding portions and a third connecting portion 132 connected between the two arc guiding portions, where the two arc guiding portions respectively extend toward the direction of the arc extinguishing chamber 14, and the arc guiding portions extend to the upper side of the arc extinguishing chamber 14, so that the arc extinguishing chamber 14 is disposed between the first arc striking portion 114 and the arc guiding portion, so that the arc is drawn longer, and the utilization rate of the arc extinguishing chamber 14 is higher. The two arc guiding parts are a first arc guiding part 131 and a second arc guiding part 133, which are respectively used for being matched with the first arc striking parts 114 of the two static contacts 11, and the third connecting part 132 is used for electrically connecting the first arc guiding part 131 and the second arc guiding part 133. The contact 120 and the third striking portion 122 are located between the first arc guiding member 13 and the first striking portion 114, and the third striking portion 122 extends in a direction approaching the corresponding arc extinguishing chamber 14 and the first arc guiding member 13.

As shown in fig. 9 to 10, when the switching device of the present embodiment is opened, the arc current at the initial stage of separation of the moving contact 12 and the fixed contact 11 is transferred from the fixed contact 11 and the moving contact 12 of fig. 9 to the first striking part 114 and the third striking part 122 shown in fig. 10 and enters the arc extinguishing chamber; as shown in fig. 10, the current loop path at the initial stage of opening is: the first connection portion 113 of the first fixed contact 11A, the first connection portion 112 of the first fixed contact 11A, the first striking portion 114 of the first fixed contact 11A, the third striking portion 122, the contact 120, the other third striking portion 122, the first striking portion 114 of the second fixed contact 11B, the first connection portion 112 of the second fixed contact 11B, and the first connection portion 113 of the second fixed contact 11B.

As shown in fig. 11, after the arc is transferred from the first striking portion 114 to the first arc guide 13, the current loop path will be transferred as: the arc extinguishing chamber utilization ratio is higher because of the first wiring part 113 of the first fixed contact 11A, the first connecting part 112 of the first fixed contact 11A, the first arc striking part 114 of the first fixed contact 11A, the first arc guiding part 131, the third connecting part 132 of the first arc guiding piece 13, the second arc guiding part 133, the first arc striking part 114 of the second fixed contact 11B, the first connecting part 112 of the second fixed contact 11B, and the first wiring part 113 of the second fixed contact 11B. Preferably, the third connecting portion 132 of the first arc guiding member 13 is located between the first contact portion 111 and the first wire connecting portion 113 of the fixed contact 11, which is beneficial to improving the arc striking and magnetic blowing efficiency. That is, in the height direction shown in fig. 11, the third connection portion 132 is located between the first contact portion 111 and the first wiring portion 113, and between the second contact portion 121 and the first wiring portion 113. The third connecting portion 132 is overlapped above or below the first connecting portion 112 and the contact support 124 of the stationary contact 11 in the width direction of the switching device.

The arc running structure of the contact unit 1 of the embodiment comprises a first arc striking part 114, a second arc striking part 115, a third arc striking part 122, a second inclined part 125 and a first arc guiding piece 13, so that an arc can be quickly guided to an arc extinguishing chamber, and the arc can be pulled longer by the first arc striking part 114 and the arc guiding part of the first arc guiding piece 13, so that the utilization rate of the arc extinguishing chamber 14 is higher, and the arc extinguishing chamber can be used for switching of higher rated current; the third striking portion 122 can guide the arc to jump more quickly onto the first arc guide 13. As another modified embodiment, the second inclined portion 125 or the second arc striking portion 115 may not be provided, and the third arc striking portion 122 or the first arc guide 13 may not be provided. Obviously, the arc running structure of the invention can be used for not only the switching device of the embodiment, but also other switching appliances.

Preferably, as shown in fig. 6 to 7, in a preferred specific structure of the arc running structure, one end of the first contact portion 111, which is far away from the first avoidance hole 116, is provided with a first arc surface 1114, and one end of the first contact portion, which is near to the first avoidance hole 116, is provided with a second arc surface 1115; the first striking part 114 is bent and inclined along the first arc surface 1114 in a direction away from the second contact part 121, and the second striking part 115 is inclined along the second arc surface 1115 in a direction opposite to the first striking part 114 and away from the second inclined part 125 through the first connecting part 112. The first striking portion 114 includes a first inclined section 1141 and a first straight section 1142, one end of the first striking portion 114 is connected to the first contact portion 111 and extends along the first arc surface 1114 in a bending manner in a direction away from the second contact portion 121, the other end of the first striking portion 114 is connected to the first straight section 1142, the first straight section 1142 corresponds to the arc extinguishing chamber 14, and the first straight section 1142 extends to the lower side of the arc extinguishing chamber 14. The end of the second contact portion 121 is provided with a third arc surface, and the third striking portion 122 is bent and obliquely extended along the third arc surface in a direction away from the first contact portion 111. The end of the second contact portion 121 is provided with a third arc surface, and the third striking portion 122 is bent and obliquely extended along the third arc surface in a direction away from the first contact portion 111. Preferably, the thickness of the first arc striking part 114 and the second arc striking part 115 is smaller than the thickness of the Yu Jing contact 11, and the first arc striking part 114 and the second arc striking part 115 are welded on the fixed contact 11; the thickness of the third striking part 122 is smaller than that of the contact 120, and the third striking part 122 is welded on the second contact part 121 to be close to the movable contact; the first striking part 114, the second striking part 115 and the third striking part 122 are thinner in thickness, have arc extension, and have better striking effect.

Preferably, each arc guiding portion of the first arc guiding member 13 includes a second straight segment 1301, a second inclined segment 1302 and a third straight segment 1303, which are sequentially connected, the third straight segment 1303 is correspondingly parallel to the second contact portion 121, the second inclined segment 1302 is correspondingly parallel to the third arc striking portion 122, the second straight segment 1301 is correspondingly parallel to the arc extinguishing chamber 14, and the second straight segment 1301 extends to the upper side of the arc extinguishing chamber 14, so that the second inclined segment 1302 and the third straight segment 1303 are closer to the contact 120, and the arc is facilitated to jump to the first arc guiding member 13 rapidly. The arc guiding parts (131, 132) of the first arc guiding member 13 and the third arc striking part 122 of the present embodiment have overlapping parts parallel to each other, that is, the second inclined section 1302 of the arc guiding part and the third arc striking part 122, and in the moving range of the moving contact, overlapping parts parallel to each other always exist, so that the shortest distance between the arc guiding part of the first arc guiding member 13 and the third arc striking part 122 is unchanged, and in the opening and closing process of the moving contact and the static contact, the arc can be led to the upper part of the arc extinguishing chamber through the third arc striking part 122 and the arc guiding part of the first arc guiding member 13 relatively quickly, thereby improving the arc striking efficiency.

Preferably, as shown in fig. 6-7, in a preferred specific structure of the moving contact 12, the contact support 124 is provided with a contact mounting groove 1241 for mounting the contact 120, a spring mounting groove 1242 for mounting the contact spring 126, the contact mounting groove 1241 communicates with the spring mounting groove 1242, the contact 120 penetrates through the contact mounting groove 1241, the second connecting portion 123 is disposed in the contact mounting groove 1241, the contact 120 is perpendicular to the moving direction of the contact support 124, the contact spring 126 is mounted in the spring mounting groove 1242, the contact spring 126 acts between the middle portion of the contact 120 and the contact support 124, one end of the contact spring 126 acts on the second connecting portion 123 of the contact 120, and one end acts on the top side wall of the spring mounting groove 1242.

Preferably, as shown in fig. 7, the contact support 124 is provided with an arc isolation structure for isolating two breakpoint arcs at two sides of the contact support 124, so as to effectively avoid mutual interference of the two breakpoint arcs and facilitate movement of the arcs to the arc extinguishing chamber. The arc isolating structure includes a baffle 1243 spaced between the first contact portions 111 of the two stationary contacts 11. In this embodiment, the top end of the baffle 1243 extends into the contact mounting groove 1241 to support the contact 120, the baffle 1243 and the contact spring 126 respectively act on two sides of the second connecting portion 123, and the baffle 1243 is always located between the first contact portions 111 of the two fixed contacts 11 during the linear movement of the contact support 124, whether the contact is switched on or off. Preferably, a sliding groove 1244 is further provided at the bottom of the contact support 124, in this embodiment, the sliding groove 1244 is located at the bottom of the baffle 1243, and the sliding groove 1244 cooperates with the second protrusion 105 in the contact unit housing 10, so as to perform a function of guiding the sliding of the contact support 124, and further effectively isolate the breakpoint arcs on both sides. In this embodiment, the lower half of the contact support 124 is used as a baffle 1243, and the contact support 124 extends between the two fixed contacts 11, and in other embodiments, the baffle 1243 includes a protruding portion protruding from a side surface of the contact support 124, and a plane of the protruding portion is perpendicular to the contact 120.

Preferably, as shown in fig. 12 to 14, the arc extinguishing structure in the contact unit housing 10 of the contact unit 1 of the present embodiment includes a magnetic blow structure, and the arc is driven in the direction of the arc extinguishing chamber 14 by using a magnetic field, so as to accelerate the arc entering the arc extinguishing chamber 14.

The magnetic blowing structure of the contact unit 1 in this embodiment includes two groups of permanent magnets 18 and two groups of magnetic conductive plates 17, the two groups of permanent magnets 18 are respectively corresponding to the two fixed contacts 11 and the two arc extinguishing chambers 14, and a group of magnetic conductive plates 17 is arranged on the outer side of each group of permanent magnets 18. Each group of permanent magnets 18 comprises a first permanent magnet 18A and a second permanent magnet 18B which are arranged in parallel at intervals, and at least the arc extinguishing chamber 14, a first contact part 111 of the fixed contact 11, a second contact part 121 of the moving contact 12 and an arc running structure between the arc extinguishing chamber 14 and the fixed contact 11 and the moving contact 12 are arranged in the area between the first permanent magnet 18A and the second permanent magnet 18B.

Preferably, the magnetic conductive plate 17 includes a first magnetic conductive plate 171, a second magnetic conductive plate 173, and a connection plate 172, where the first magnetic conductive plate 171 and the second magnetic conductive plate 173 are disposed in parallel, and the connection plate 172 is connected to the first magnetic conductive plate 171 and the second magnetic conductive plate 173, so that the magnetic conductive plate 17 is U-shaped. The first magnetic conductive plate 171 and the second magnetic conductive plate 173 are respectively and correspondingly disposed on the outer sides of the first permanent magnet 18A and the second permanent magnet 18B, the connection plate 172 is disposed corresponding to the lower side of the arc extinguishing chamber 14, avoiding the exhaust end of the arc extinguishing chamber 14, and the connection plate 172 is connected with the lower sides of the first magnetic conductive plate 171 and the second magnetic conductive plate 173 near the static contact 11 and is located on the outer side of the first arc striking portion 114.

Preferably, as shown in fig. 14, the polarities of the first permanent magnet 18A and the second permanent magnet 18B of each permanent magnet 18 are opposite, and the polarities of the first permanent magnets 18A of the two permanent magnets 18 are opposite, that is, the polarities of the two first permanent magnets 18A of the two permanent magnets 18 on the same side of the moving contact 12 in the width direction of the contact unit 1 are opposite, and the polarities of the two second permanent magnets 18B of the two permanent magnets 18 on the same side of the moving contact 12 are opposite, and the permanent magnets 18 may be permanent magnets. If the first permanent magnet 18A corresponding to the left arc-extinguishing chamber 14 is N and the second permanent magnet 18B is S, the first permanent magnet 18A corresponding to the right arc-extinguishing chamber 14 is S and the second permanent magnet 18B is N.

As shown in fig. 15, when the switching device of the present embodiment is turned off, the open arc on the left side of the moving contact 12 moves in the direction of the arc extinguishing chamber 14 on the left side (along the first striking portion 114 and the third striking portion 122) by the left side group permanent magnet 18, and the open arc on the right side of the moving contact 12 moves in the opposite direction of the arc extinguishing chamber 14 on the right side (along the second striking portion 115 and the second inclined portion 125) by the right side group permanent magnet 18, when the open current is small (under normal operation current). When the current is reversed, the open arc on the right side of the moving contact 12 is moved in the direction of the right arc extinguishing chamber 14 (along the first striking part 114 and the third striking part 122) by the right side group permanent magnet 18, and the open arc on the left side of the moving contact 12 is moved in the opposite direction of the left arc extinguishing chamber 14 (along the second striking part 115 and the second tilting part 125) by the left side group permanent magnet 18, so that the nonpolar application can be realized. If the current is small, the on-off arc on both sides is moved to the respective arc extinguishing chambers 14 by the corresponding permanent magnets 18, but when the current is reversed, the on-off arc on both sides is moved to the opposite direction to the respective arc extinguishing chambers 14 by the corresponding permanent magnets 18, and at this time the arc cannot be effectively extinguished.

As shown in fig. 16-17, when the breaking current is large (overload or short circuit), the exciting magnetic field of the moving contact conductive loop is larger than the effect of the magnetic field of the permanent magnet 18 on the arc, and the exciting magnetic field of the moving contact conductive loop drives the switch arc to move towards the corresponding arc extinguishing chamber 14 area, the on-off arc at the left side of the moving contact 12 moves towards the arc extinguishing chamber 14 at the left side, and the on-off arc at the right side of the moving contact 12 moves towards the arc extinguishing chamber 14 at the right side.

The magnetic blowing structure of the switching device of the embodiment can realize that when small current (indicating normal working current) is turned on and off, one side of the on-off arc drives towards the corresponding arc extinguishing chamber, and the other side of the on-off arc drives reversely towards the corresponding arc extinguishing chamber, so that the non-polarity application is realized; when the high current is cut off, the arc is excited by the magnetic field of the conductive loop, so that the cut-off arcs at two sides respectively move to the two arc extinguishing chambers, and the arc extinguishing speed can be improved. Obviously, the magnetic blow-out structure of the invention can be used not only for the switching device of the embodiment, but also for other switching appliances. In addition, in the embodiment, the C-shaped structure of the fixed contact 11 and the structure that the contact 120 passes through the first avoidance hole 116, and the arrangement of the second inclined portion 125 of the contact 120 are beneficial to improving the arc striking effect of the arc running structure and the driving force of the excitation magnetic field of the conductive loop of the fixed contact and the moving contact of the magnetic blowing structure. It should be noted that, as other degraded examples, the magnetic blowout structure may be provided with only the permanent magnet 18, and the magnetically permeable plate 17 may not be provided.

In addition, the C-shaped structure of the fixed contact 11 and the structure that the contact 120 passes through the first avoidance hole 116 are beneficial to improving the opening distance of the first contact part 111 and the second contact part 121 after opening the brake. Of course, as other embodiments, the fixed contact 11 may not be provided with the first avoidance hole 116, for example, the fixed contact 11 may be integrally disposed on the upper side or the lower side of the contact 12, or the C-shaped structure of the fixed contact 11 may be opened in a direction perpendicular to the paper surface in fig. 5 instead of being opened toward the arc extinguishing chamber 14, or the fixed contact 11 may not be configured in a C-shape, which falls within the protection scope of the present invention.

As shown in fig. 12, preferably, the first permanent magnet 18A and the second permanent magnet 18B have the same structure, and each includes a first permanent magnet plate 181, a second permanent magnet plate 182 and a third permanent magnet plate 183 that are sequentially connected, the third permanent magnet plate 183 corresponds to the arc extinguishing chamber 14, the first permanent magnet plate 181 corresponds to the moving area of the second contact portion 121, the width of the third permanent magnet plate 183 is larger than that of the first permanent magnet plate 181, the second permanent magnet plate 182 is connected between the first permanent magnet plate 181 and the third permanent magnet plate 183, and the side edges of the second permanent magnet plate 182 are obliquely arranged and preferably correspond to at least a part of the first arc striking portion 114 and the third arc striking portion 122. The first magnetic conductive plate 171 and the second magnetic conductive plate 173 of the magnetic conductive plate 17 have the same shape as the first permanent magnet 18A and the second permanent magnet 18B.

The magnetic blow-out structure of this embodiment can also be used in another embodiment of a contact mechanism, such as the one shown in fig. 18, comprising one moving contact 12, two stationary contacts 11 and two arc extinguishing chambers 14, the overall structure being similar to the embodiment of fig. 12, also comprising two sets of permanent magnets 18 and two sets of magnetic conductive plates 17. Preferably, the first permanent magnet 18A and the second permanent magnet 18B of each set of permanent magnets 18 are opposite in polarity, the first permanent magnet 18A of the two sets of permanent magnets 18 are opposite in polarity, and the second permanent magnet 18B of the two sets of permanent magnets 18 are opposite in polarity. The embodiment of fig. 18 is different from the above embodiment mainly in the structure and layout of the moving and fixed contacts, and in the embodiment of fig. 18, the two fixed contacts 11 of the contact mechanism are located on the same side of the moving contact 12. Specifically, the stationary contacts 11 include a first contact portion 111, a first connection portion 112, and a first connection portion 113, where the first contact portion 111, the first connection portion 112, and the first connection portion 113 are sequentially connected to form a C-shaped structure, openings of the C-shaped structures of the two stationary contacts 11 are opposite, and the openings face the respective corresponding arc extinguishing chambers 14. The two fixed contacts 11 are not provided with first avoidance holes, the first contact part 111, the first connection part 112 and the first wiring part 113 are all positioned on the same side of the contact 120, and the contact support 124 moves linearly to reciprocate linearly along the contact 120 towards the direction approaching to the fixed contact 11 and away from the fixed contact 11.

Preferably, the switching device further comprises a current detection mechanism, the current detection mechanism is used for collecting a main loop current signal of the contact unit 1, the current detection mechanism is connected with a control device, the auxiliary switch is connected in series in a power supply loop of the electromagnetic coil 21, and the control device is connected with the auxiliary switch and can drive the auxiliary switch to be opened and closed; in case of a fault, such as overload or short circuit, the control device controls the auxiliary switch (such as a relay, etc.) to cut off the supply circuit of the electromagnetic coil 21 of the electromagnetic unit 2, thereby achieving the opening of the main circuit current. An embodiment is that the current detection mechanism includes a current sensor, in this embodiment, the current sensor is a hall sensor, the hall sensor is disposed on an outer side wall of the contact unit housing 10, an installation groove for installing the hall sensor is disposed on the outer side wall of the contact unit housing 10, and the hall sensor is closely attached to the static contact 11 or the moving contact 12 or the conductive loop of the main loop of the contact unit 1. By arranging the current sensor outside the contact unit housing 10, the installation is facilitated and can be set as desired. Of course, as other embodiments, the current sensor may be disposed in the contact unit housing 10, or may be other current sensors, such as a manganese-copper shunt, etc. The control device comprises a microcontroller MCU, and the control device and an auxiliary switch for cutting off a power supply loop of the electromagnetic coil 21 can be arranged in the electromagnetic unit 2, can also be positioned outside the electromagnetic unit 2, such as in the contact unit 1, or can be arranged on an upper device (such as an upper computer) of the switching device, and belong to the protection scope of the invention.

Preferably, the switching device further comprises a short-circuit protection mechanism, the short-circuit protection mechanism comprises an electromagnetic release and an auxiliary contact, the auxiliary contact is connected in series in a power supply loop of the electromagnetic coil 21 of the electromagnetic unit 2, the auxiliary contact is a normally closed contact, when a short-circuit fault occurs, the electromagnetic release acts to drive the auxiliary contact to be disconnected, the power supply loop of the electromagnetic coil 21 of the electromagnetic unit 2 is cut off, the electromagnetic unit 2 is rapidly powered off in a mechanical mode, and then the electromagnetic unit 2 drives the contact unit 1 to be rapidly disconnected, so that rapid short-circuit protection is realized. An embodiment of an electromagnetic release includes a yoke that senses a short circuit current, an armature that moves to switch an auxiliary contact from normally closed to normally open to cut power to the electromagnetic coil 21, and a spring connected between the yoke and the armature. The short-circuit protection mechanism can be arranged outside the electromagnetic unit 2 and the contact unit 1 as a separate module, and can also be arranged in the contact unit 1 or in the electromagnetic unit 2.

As shown in fig. 2 and 3, the contact unit housing 10 has a rectangular parallelepiped structure, and includes a first upper sidewall and a first lower sidewall that are disposed opposite to each other at intervals, a first left sidewall and a first right sidewall that are disposed opposite to each other, and a first front sidewall and a first rear sidewall that are disposed opposite to each other. The first front side wall and/or the first rear side wall is provided with the first linkage hole 101 for the linkage rod 25 to pass through and connect to the contact support 124 of the moving contact 12. The first left side wall and the first right side wall of the contact unit housing 10 are further provided with an exhaust port 102, and the exhaust port 102 corresponds to an exhaust end of the arc extinguishing chamber 14 and is used for exhausting arc gas; the air inlet end of the arc extinguishing chamber 14 faces the fixed contact 11. The height of the contact unit 1 is between the first upper side wall and the first lower side wall, the length of the contact unit 1 is between the first left side wall and the first right side wall, the width of the contact unit 1 is between the first front side wall and the first rear side wall, and the distance between the first front side wall and the first rear side wall is smaller than the distance between the first left side wall and the first right side wall and smaller than the distance between the first upper side wall and the first lower side wall.

Preferably, the first upper side wall of the contact unit 1 is provided with two power connection parts 103 for connecting conductors so as to connect an external power source and a load, and facilitate connection of the switch device after assembly. Of course, as other embodiments, the power supply wiring portion 103 may be provided on other side walls. The two power supply wiring parts 103 are electrically connected with the two fixed contacts 11; preferably, the fixed contact 11 is integrally formed with the power connection part 103 of the contact unit 1, and the first connection part 113 of the fixed contact 11 extends out of the contact unit housing 10 to serve as the power connection part 103 of the contact unit 1; of course, the stationary contact 11 may be provided separately from the power supply connection portion 103 of the contact unit 1. The moving direction of the contact support 124 is perpendicular to the first upper side wall and the first lower side wall, a separation protrusion 104 is arranged on the first upper side wall corresponding to the moving direction of the contact support 124, the separation protrusion 104 is located between the two power connection parts 103, the separation protrusion 104 not only increases the creepage distance between the two power connection parts 103, but also can form a movable space of the contact support 124 in the separation protrusion 104, thereby reducing the height of the contact unit 1, and ensuring that the moving contact and the static contact have larger opening distances. The separation protrusion 104 is disposed corresponding to the moving track of the contact support 124, and the contact support 124 can move to the movable space inside the separation protrusion 104.

As shown in fig. 2 and 4, the electromagnetic unit housing 20 has a rectangular parallelepiped structure, and includes a second upper sidewall and a second lower sidewall disposed opposite to each other at intervals, a second left sidewall and a second right sidewall disposed opposite to each other, and a second front sidewall and a second rear sidewall disposed opposite to each other. The second front sidewall and/or the second rear sidewall is provided with the second linkage hole 201 for the linkage rod 25 to pass through and connect to the moving core 22. Two control wiring parts (not shown) for supplying power to the electromagnetic coil 21 and driving the plunger 22 to operate are provided on the electromagnetic unit housing 20. The height of the electromagnetic unit 2 is between the second upper side wall and the second lower side wall, the length of the electromagnetic unit 2 is between the second left side wall and the second right side wall, the width of the electromagnetic unit 2 is between the second front side wall and the second rear side wall, and the distance between the second front side wall and the second rear side wall is smaller than the distance between the second left side wall and the second right side wall and smaller than the distance between the second upper side wall and the second lower side wall.

Preferably, as shown in fig. 12, the contact unit housing 10 includes a first base H1, a second base H2, a first partition H3, and a second partition H4, where the first base H1 and the second base H2 are oppositely installed to form an outer housing of the contact unit 1, that is, the contact unit housing 10, and the first base H1 and/or the second base H2 are provided with a second protrusion 105, which is matched with a chute 1244 at the bottom of the contact support 124. The first partition board H3 and the second partition board H4 are oppositely installed to form an inner housing of the contact unit 1, the fixed contact 11, the moving contact 12 and the arc extinguishing chamber 14 are installed between the first partition board H3 and the second partition board H4, a first installation space for arranging a contact mechanism is formed between the first partition board H3 and the second partition board H4, and the first installation space and the second installation space can be connected into an integral contact module through screws, rivets, buckles or the like, and then are integrally installed between the first base H1 and the second base H2. A permanent magnet 18 and a magnetic conduction plate 17 are arranged between the inner shell and the outer shell, the permanent magnet 18 is arranged outside the first partition plate H3 and the second partition plate H4, and the magnetic conduction plate 17 is arranged outside the permanent magnet 18. First outer grooves H341 are formed on the outer sides of the first and second spacers H3 and H4, and the first and second permanent magnets 18A and 18B are respectively disposed in the first outer grooves H341 of the first and second spacers H3 and H4. Preferably, the first outer groove H341 is simultaneously used for mounting the magnetically permeable plate 17. The first and second magnetic conductive plates 171 and 173 of the magnetic conductive plate 17 are also disposed in the first outer grooves H341 of the first and second separators H3 and H4, and the connection plate 172 is disposed corresponding to the lower side of the arc extinguishing chamber 14.

It should be noted that, in the description of the present invention, the terms "upper," "lower," "left," "right," "inner," "outer," and the like refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in use, merely for convenience of description, and do not refer to the fact that the apparatus or element referred to must have a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating relative importance.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments disclosed herein. It should be understood that those skilled in the art to which the present invention pertains may make several simple deductions or substitutions without departing from the inventive concept, and should be considered as falling within the scope of the present invention.

Claims (13)

1. The utility model provides an arc extinguishing structure, including two stationary contact (11), moving contact (12) and two explosion chambers (14), moving contact (12) are including installing contact (120) on contact support (124), stationary contact (11) are equipped with first contact portion (111), the both ends of contact (120) are equipped with second contact portion (121), contact support (124) can rectilinear movement drive two second contact portions (121) of contact (120) and the first contact portion (111) contact or the separation of two stationary contact (11), two explosion chambers (14) set up in the both sides of the contact area of two second contact portions (121) and the first contact portion (111) of two stationary contact (11), its characterized in that: the device comprises two groups of permanent magnets (18), wherein the two groups of permanent magnets (18) are respectively arranged corresponding to two fixed contacts (11) and two arc extinguishing chambers (14), each group of permanent magnets (18) comprises a first permanent magnet (18A) and a second permanent magnet (18B) which are arranged at intervals in parallel, and at least a corresponding arc extinguishing chamber (14), a first contact part (111) of the fixed contact (11) and a second contact part (121) of the moving contact (12) are arranged in an area between the first permanent magnet (18A) and the second permanent magnet (18B).

2. The arc extinguishing structure according to claim 1, characterized in that: the first permanent magnet (18A) and the second permanent magnet (18B) of each set of permanent magnets (18) are of opposite polarity.

3. The arc extinguishing structure according to claim 2, characterized in that: the polarities of the first permanent magnets (18A) of the two groups of permanent magnets (18) are opposite, and the polarities of the second permanent magnets (18B) of the two groups of permanent magnets (18) are opposite.

4. The arc extinguishing structure according to claim 1, characterized in that: the permanent magnet assembly further comprises two groups of magnetic conduction plates (17), and a group of the magnetic conduction plates (17) are arranged on the outer side of each group of permanent magnets (18).

5. The arc extinguishing structure according to claim 4, wherein: the magnetic conduction plate (17) comprises a first magnetic conduction plate (171), a second magnetic conduction plate (173) and a connecting plate (172), wherein the first magnetic conduction plate (171) and the second magnetic conduction plate (173) are arranged in parallel, and the connecting plate (172) is connected to the first magnetic conduction plate (171) and the second magnetic conduction plate (173).

6. The arc extinguishing structure according to claim 5, wherein: the first magnetic conduction plate (171) and the second magnetic conduction plate (173) are correspondingly arranged outside the first permanent magnet (18A) and the second permanent magnet (18B) respectively, the connecting plate (172) is arranged corresponding to the lower side of the arc extinguishing chamber (14) to avoid the exhaust end of the arc extinguishing chamber (14), and the connecting plate (172) is connected with the side edges of the first magnetic conduction plate (171) and the second magnetic conduction plate (173) close to the corresponding fixed contact (11).

7. The arc extinguishing structure according to claim 1, characterized in that: the fixed contact (11) is provided with a first striking part (114), and the first striking part (114) is connected with the first contact part (111) and extends to one side of the corresponding arc extinguishing chamber (14) towards the direction of the corresponding arc extinguishing chamber (14).

8. The arc extinguishing structure according to claim 7, wherein: the contact (120) is provided with a third striking part (122), and the third striking part (122) is connected with the second contact part (121) and extends towards the direction corresponding to the arc extinguishing chamber (14).

9. The arc extinguishing structure according to claim 7, wherein: the static contact (11) is also provided with a second arc striking part (115), and the second arc striking part (115) is connected with the first contact part (111) and extends in the direction opposite to the extending direction of the first arc striking part (114).

10. The arc extinguishing structure according to claim 9, characterized in that: the contact (120) comprises a second connecting portion (123), two second contact portions (121) and two second inclined portions (125), wherein the two second contact portions (121) are connected with two ends of the second connecting portion (123) through the two second inclined portions (125) respectively, the inclined planes of the second inclined portions (125) are opposite to the second striking portions (115), and the inclined planes of the second inclined portions (125) and the second striking portions (115) are inclined in directions away from each other.

11. The arc extinguishing structure according to claim 1, characterized in that: the static contact (11) comprises a first contact part (111), a first connecting part (112) and a first wiring part (113), wherein the first contact part (111), the first connecting part (112) and the first wiring part (113) are sequentially connected into a C-shaped structure, the first contact part (111) and the first wiring part (113) are oppositely arranged at intervals, two ends of the first connecting part (112) are respectively connected with one ends of the first contact part (111) and one end of the first wiring part (113), and a first avoiding hole (116) is formed in the first connecting part (112); the C-shaped structure openings of the two fixed contacts (11) are arranged in opposite directions, the openings face the corresponding arc extinguishing chambers (14), and the second contact parts (121) at the two ends of the contact (120) respectively penetrate through the first avoidance holes (116) of the two fixed contacts (11) to be matched with the first contact parts (111).

12. The arc extinguishing structure according to claim 1, characterized in that: both fixed contacts (11) are positioned on the same side of the moving contact (12).

13. The arc extinguishing structure according to claim 1, characterized in that: the static contacts (11) comprise first contact parts (111), first connection parts (112) and first wiring parts (113), the first contact parts (111), the first connection parts (112) and the first wiring parts (113) are sequentially connected into a C-shaped structure, openings of the C-shaped structures of the two static contacts (11) are arranged in a back-to-back mode, and the openings face to the corresponding arc extinguishing chambers (14); the first contact portion (111), the first connection portion (112) and the first wiring portion (113) are all located on the same side of the contact (120).