Switch

Abstract

A switch comprises an arc extinguish chamber, a moving contact and a static contact, the moving contact and the static contact are connected into a main loop of the switch, the arc extinguish chamber is used for extinguishing electric arcs generated by the moving contact and the static contact, the switch is further provided with an arc striking mechanism, the arc striking mechanism comprises a moving arc striking plate, an arc striking elastic piece and an arc striking electromagnetic mechanism, and the arc striking electromagnetic mechanism comprises an electromagnetic coil. The movable end tab is movably arranged, the arc striking elastic piece is used for driving the end tab to move close to the static contact, the two ends of the electromagnetic coil are electrically connected with the movable end tab and the main loop respectively, and when the movable end tab makes contact with an arc, current passing through the electromagnetic coil is generated between the movable end tab and the main loop. The electromagnetic coil induces a magnetic field used for attracting the movable end tab to move, the movable end tab is driven to overcome the resistance of the arc striking elastic piece to move in the direction away from the static contact, the movable end tab can directly break a part of electric arc, and especially arc extinguishing of a non-polarity direct current switch and effective breaking under critical load current can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and particularly to a switch. Background Art

[0002] With the development of the photovoltaic industry, DC circuit breakers are increasingly widely used. However, the arc extinguishing of DC circuit breakers is different from that of AC circuit breakers. AC circuit breakers can utilize current zero-crossing to extinguish the arc. At this moment, the input power of the arc is zero, creating favorable conditions for extinguishing the AC current. While DC circuit breakers do not have a zero-crossing moment, so it is necessary to find a way to increase the arc voltage to achieve the effect of current limiting. Usually, the arc voltage is increased by cutting the arc in the arc extinguishing chamber, and the arc movement speed can be increased by means of magnetic blowing during the movement of the arc.

[0003] However, DC circuit breakers also face the problem of critical load current. The arc burning time is significantly prolonged within the operating conditions, and it is easy to burn the moving and static contacts. Generally, the prior art uses two or more permanent magnets to solve this problem, but this has problems such as high cost. Summary of the Invention

[0004] The purpose of the present invention is to overcome at least one defect of the prior art and provide a switch.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A switch includes an arc extinguishing chamber, a moving contact, and a static contact. The moving contact and the static contact are connected to the main circuit of the switch. The arc extinguishing chamber is used to extinguish the arc generated between the moving contact and the static contact. An arc leading mechanism is further provided. The arc leading mechanism includes a moving arc leading plate, an arc leading elastic member, and an arc leading electromagnetic mechanism. The arc leading electromagnetic structure includes an electromagnetic coil. The moving arc leading plate is movably arranged. The arc leading elastic member is used to drive the arc leading plate to move close to the static contact. The two ends of the electromagnetic coil are respectively electrically connected to the moving arc leading plate and the main circuit. When the moving arc leading plate contacts the arc, a current passing through the electromagnetic coil is generated between the moving arc leading plate and the main circuit, causing the electromagnetic coil to induce a magnetic field for attracting the moving arc leading plate to move, and driving the moving arc leading plate to move away from the static contact against the resistance of the arc leading elastic member.

[0007] Preferably, the moving arc leading plate is rotatably arranged or slidably arranged.

[0008] Preferably, the arc leading mechanism further includes a static arc leading plate. One end of the static arc leading plate close to the moving arc leading plate is rotatably connected to the moving arc leading plate. The other end of the static arc leading plate away from the moving arc leading plate extends to the side of the arc extinguishing chamber away from the static contact. The moving arc leading plate can rotate around the end connected to the static arc leading plate.

[0009] Preferably, one of the static arcing plate and the moving arcing plate is provided with a rotating shaft structure, and the other is provided with a sleeve structure. The sleeve structure is sleeved on the rotating shaft structure to rotatably connect the moving arcing plate and the static arcing plate.

[0010] Preferably, the moving arcing plate includes an arcing portion in a straight plate shape. One end of the arcing portion is rotatably connected to the static arcing plate, and the other end of the arcing portion is provided with an extension portion protruding towards the moving contact. The arcing electromagnetic structure is arranged on the side of the arcing portion away from the static contact. The extension portion is arranged between the moving contact and the electromagnetic coil. The moving arcing plate contacts the arc through the extension portion, and a current passing through the electromagnetic coil is generated between the extension portion and the main circuit.

[0011] Preferably, the moving arcing plate and the electromagnetic coil are connected by a flexible connection. The thickness of the extension portion is greater than that of the arcing portion. The sides of the extension portion and the arcing portion close to the static contact are flush. A protruding connection block is arranged on the side of the extension portion away from the static contact, and the connection block is used for welding the flexible connection.

[0012] Preferably, the axis of the electromagnetic coil is perpendicular to the arcing portion of the moving arcing plate.

[0013] Preferably, the arcing mechanism further includes a static arcing plate. The moving arcing plate is connected to the static arcing plate through a wire or a bendable conductive material. The housing is provided with a guiding structure. When the arcing electromagnetic mechanism attracts the moving arcing plate, the moving arcing plate slides linearly along the guiding structure.

[0014] Preferably, it further includes a bimetallic strip. The bimetallic strip is connected to the terminal, and the electromagnetic coil is connected to the bimetallic strip.

[0015] Preferably, it further includes a fixing piece connected to the bimetallic strip. The fixing piece includes a first fixing portion and a second fixing portion connected at an oblique angle. The electromagnetic coil is connected to the first fixing portion, and the side of the second fixing portion is connected to the side of the bimetallic strip.

[0016] Preferably, it further includes a movable arc isolation structure. When the static contact and the moving contact are separated, the arc isolation structure moves towards the moving arcing plate and moves between the static contact and the moving contact. When the static contact and the moving contact are in contact, the arc isolation structure moves away from the moving arcing plate and moves out of the space between the static contact and the moving contact.

[0017] Preferably, the arc isolation structure is rotatably arranged.

[0018] Preferably, the moving contact is connected to the arc isolation structure and can drive the arc isolation structure to rotate between the static contact and the moving contact, or move out of the space between the static contact and the moving contact.

[0019] Preferably, the arc separating structure includes a rotating plate and an arc separating plate. The rotating plate is rotatably arranged, and the arc separating plate is arranged at an eccentric position of the rotating plate. A driving groove is provided on the rotating plate, and a driving rod for inserting into the driving groove is provided on the moving contact. When the moving contact rotates, the rotating plate is pushed by the driving rod, so that the rotating plate drives the arc separating plate to rotate around the rotating shaft, and the arc separating plate rotates between the static contact and the moving contact, or moves out from between the static contact and the moving contact.

[0020] Preferably, the movement trajectories of the driving groove and the driving rod are the same arc. The driving groove includes two driving surfaces oppositely arranged on both sides of the movement direction of the driving rod, and the distance between the two driving surfaces is greater than the diameter of the driving rod. When the driving rod pushes the two driving surfaces, the arc separating structure can be driven to rotate in two opposite directions respectively. After the driving rod separates from one of the driving surfaces, it turns through a certain angle in the driving groove and then contacts the other driving surface.

[0021] The switch of the present application is provided with a movable arc leading plate. The electromagnetic coil of the arc leading electromagnetic mechanism uses the arc to generate a magnetic field, and then attracts the movable arc leading plate to move through the magnetic field. When the movable arc leading plate moves, it can not only drive the arc to move, make the arc leave the static contact more quickly and move towards the arc extinguishing chamber, improving the arc extinguishing efficiency of the arc extinguishing chamber, but also directly break part of the arc. After the arc is broken, it extinguishes in the air, which can further improve the arc extinguishing efficiency of the AC or DC switch, especially can realize the arc extinguishing of the non-polar DC switch and the effective breaking under the critical load current.

[0022] In addition, the static arc leading plate can not only play the role of rotatably installing the movable arc leading plate, but also provide a track for the arc to move towards the arc extinguishing chamber, without the need to additionally set up parts for installing the movable arc leading plate alone, having the characteristic of fewer parts.

[0023] In addition, by providing an extension part protruding towards the moving contact on the arc leading part, the extension part is close to the moving contact, which can make it easier for the arc to jump to the arc leading plate, and then make the electromagnetic coil induce the magnetic field for attracting the arc leading plate to move earlier. In addition, a connecting block can be arranged on the side surface of the extension part, and the connecting block can facilitate the welding of the flexible connection and reduce the assembly difficulty. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of an embodiment of the DC circuit breaker of the present invention;

[0025] Figure 2 is a schematic structural diagram of the arc leading mechanism of the present invention;

[0026] Figure 3 is a schematic diagram of the cooperation between the arc separating mechanism and the moving contact of the present invention;

[0027] Figure 4is the position where the moving contact and the static contact of the present invention are separated;

[0028] Figure 5 is the position where the moving contact and the static contact of the present invention are in contact;

[0029] In the figure, there are housing 11; moving contact 12; static contact 13; arc extinguishing chamber 14; operating mechanism 15; handle 16; first terminal 171; second terminal 172; short - circuit release 18; overload release 19; moving arcing plate 2; arcing elastic member 3; electromagnetic coil 4; static arcing plate 5; rotating shaft structure 61; sleeve structure 62; rotating shaft portion 611; second bending portion 621; arcing portion 21; extending portion 22; connecting block 23; flexible connection 24; coil portion 40; first connection portion 41; second connection portion 42; iron core 43; fixing piece 44; first fixing portion 441; second fixing portion 442; first spring arm 31; second spring arm 32; spring shaft 33; arc - separating structure 7; rotating plate 71; arc - separating plate 72; rotating shaft 73; driving groove 74; driving rod 75. Detailed implementation manners

[0030] The following embodiments given in conjunction with the drawings further illustrate the detailed implementation manners of the switch of the present invention. The switch of the present invention is not limited to the descriptions of the following embodiments.

[0031] As Figure 1 shown, the switch of this embodiment is a DC circuit breaker, including a housing 11 and a moving contact 12, a static contact 13, an arc extinguishing chamber 14, an operating mechanism 15 and a handle 16 respectively arranged in the housing 11. The moving contact 12 and the static contact 13 are connected to the main circuit of the switch and form a part of the main circuit. The moving contact 12 and the static contact 13 are respectively connected to the circuit through the first terminal 171 and the second terminal 172 at both ends of the housing 11. One of the first terminal 171 and the second terminal 172 serves as the incoming line end and the other serves as the outgoing line end. The handle 16 drives the moving contact 12 to act through the operating mechanism 15, so that the moving contact 12 contacts and separates from the static contact 13, thereby conducting and disconnecting the main circuit of the switch, and realizing the on - off control of the connected circuit. The arc extinguishing chamber 14 is used to extinguish the arc generated between the moving contact 12 and the static contact 13. The arc extinguishing chamber 14 is provided with a plurality of grid pieces, and the arc is cut into a plurality of small segments by the plurality of grid pieces and then extinguished.

[0032] The operating mechanism 15 can adopt an existing four-link or five-link structure. In this embodiment, the operating mechanism 15 includes a contact support and a energy storage spring connected to the contact support. The contact support is connected to the moving contact 12. A rotatable trip latch and a lock latch are respectively provided on the contact support. The trip latch and the lock latch are engaged in a latched manner. A connecting rod is provided between the trip latch and the handle 16. The two ends of the connecting rod are respectively rotatably connected to the handle 16 and the trip latch, so that the handle 16 is connected to the trip latch through the connecting rod. When the trip latch and the lock latch are engaged in a latched manner, the lock latch locks the trip latch and the contact support. When the handle 16 pushes the trip latch through the connecting rod, the trip latch can drive the contact support to rotate. When the handle 16 rotates in two opposite directions respectively, the contact support can drive the moving contact 12 to contact and separate from the static contact 13. When the moving contact 12 contacts the static contact 13, the contact support compresses the energy storage spring and is locked by the handle 16.

[0033] A short-circuit release 18 and an overload release 19 for triggering the tripping of the trip latch and the lock latch are provided in the housing 11. The short-circuit release 18 and the overload release 19 are both connected to the main circuit of the switch. When a short-circuit current and an overload current appear in the connected line, they can trigger the tripping of the trip latch and the lock latch, so that the lock latch unlocks the trip latch and the contact support. When the handle 16 pushes the trip latch through the connecting rod, the trip latch rotates relative to the contact support. When the handle 16 rotates, it cannot drive the contact support to rotate through the trip latch, and the handle 16 loses the locking of the contact support, so that the energy storage spring is released. When the energy storage spring is released, it drives the contact support to rotate, so that the moving contact 12 is separated from the static contact 13, realizing the functions of short-circuit protection and overload protection. The short-circuit release 18 includes a coil and a moving iron core driven by the coil. The coil is connected between the static contact 13 and the first terminal 171. When the short-circuit current flowing through the coil meets the operating condition, the coil drives the moving iron core to move, and the moving iron core directly or indirectly triggers the unlocking of the lock latch and the trip latch.

[0034] The overload release 19 includes a bimetallic strip. The bimetallic strip is connected between the moving contact 12 and the second terminal 172. When the overload current flowing through the bimetallic strip meets the operating condition, the bimetallic strip bends due to temperature rise, and then directly or indirectly triggers the unlocking of the lock latch and the trip latch.

[0035] It can be understood that the above-mentioned arc extinguishing chamber 14, operating mechanism 15, short-circuit release 18, overload release 19, moving contact 12, static contact 13, first terminal 171 and second terminal 172 can all be realized by existing technologies.

[0036] Such as Figure 1As shown in the figure, the DC circuit breaker of this embodiment is provided with an arc ignition mechanism. The arc ignition mechanism is located on one side below the moving contact 12 and the static contact 13, and is located on the right side of the arc extinguishing chamber in the figure, that is, on the inlet side of the arc extinguishing chamber. The arc ignition mechanism is used to direct the arc between the moving contact 12 and the static contact 13 to the arc extinguishing chamber 14. The faster the arc enters the arc extinguishing chamber 14, the faster the arc can be extinguished.

[0037] As Figure 1-2 shown in the figure, the arc ignition mechanism includes a moving arc ignition plate 2, an arc ignition elastic member 3 and an arc ignition electromagnetic mechanism. The moving arc ignition plate 2 is movably arranged. The arc ignition elastic member 3 is used to drive the arc ignition plate 2 to move closer to the static contact 13. The arc ignition electromagnetic mechanism includes an electromagnetic coil 4. The two ends of the electromagnetic coil 4 are respectively electrically connected to the moving arc ignition plate 2 and the main circuit. The moving arc ignition plate 2 is a metal conductor that can provide a moving track for the arc. When the moving arc ignition plate 2 contacts the arc, the moving contact 12 and the moving arc ignition plate 2 are at the same potential. The original current passes through the second terminal 172, the bimetallic strip, the moving contact 12, the arc, the static contact 13, the short-circuit release 18 and the first terminal 171 in sequence, and is changed to pass through the second terminal 172, the moving arc ignition plate 2, the arc, the static contact 13, the short-circuit release 18, the first terminal 171 in sequence, so that a current passing through the electromagnetic coil 4 is generated between the moving arc ignition plate 2 and the main circuit, and the arc ignition electromagnetic mechanism induces a magnetic field for attracting the moving arc ignition plate 2 to move. The magnetic field attracts the moving arc ignition plate 2 to move away from the static contact 13 against the resistance of the arc ignition elastic member 3. At the same time, the moving arc ignition plate 2 will compress the arc ignition elastic member 3, and the arc ignition elastic member 3 drives the arc ignition plate 2 to reset after the magnetic field of the arc ignition electromagnetic mechanism disappears.

[0038] The DC circuit breaker of this embodiment is provided with a movable moving arc ignition plate. When the electromagnetic coil 4 of the arc ignition electromagnetic mechanism passes through a current, a magnetic field is generated, and then the magnetic field attracts the moving arc ignition plate 2 to move. When the moving arc ignition plate 2 moves, it can not only drive the arc to move, make the arc leave the static contact 13 more quickly and move towards the arc extinguishing chamber 14, improve the arc extinguishing efficiency of the arc extinguishing chamber 14, but also the moving arc ignition plate 2 can directly break part of the arc. After the arc is broken, it extinguishes in the air, which can further improve the arc extinguishing efficiency, and then realize the arc extinguishing of the non-polar DC circuit breaker and the effective breaking under the critical load current. In addition, the electromagnetic coil 4 of the arc ignition electromagnetic mechanism uses the magnetic field generated by the arc to attract the arc to move towards the arc extinguishing chamber, playing a certain role in arc ignition. It should be noted that the technical solutions of the arc ignition plate 2 and the arc ignition electromagnetic mechanism in this embodiment are not limited to DC circuit breakers, but can also be other DC switches such as DC contactors. In addition, although alternating current has a zero-crossing moment, which creates favorable conditions for arc extinguishing, there is generally no problem of critical load current, and small current can be directly extinguished. However, stretching the arc is also common for both AC and DC, which is beneficial to improving the arc extinguishing efficiency. The moving arc ignition plate of this embodiment can also be used in AC circuit breakers and other AC switching electrical appliances.

[0039] As shown Figure 2 in the figure, the arc ignition mechanism further includes a static arc ignition plate 5. One end of the static arc ignition plate 5 close to the moving arc ignition plate 2 is rotatably connected to the moving arc ignition plate 2. The end of the static arc ignition plate 5 far from the moving arc ignition plate 2 extends to the side of the arc extinguishing chamber 14 away from the static contact 13, that is, extends to the lower side of the arc extinguishing chamber 14. When the arc ignition electromagnetic structure attracts the moving arc ignition plate 2 to move, the moving arc ignition plate 2 can rotate around the end connected to the static arc ignition plate 5.

[0040] By rotatably mounting the moving arc ignition plate 2 on the static arc ignition plate 5, the reliability of the moving arc ignition plate 2 can be improved. The moving arc ignition plate 2 can also be slidably arranged. At the same time, the moving arc ignition plate 2 is connected to the static arc ignition plate 5 through a wire or a bendable conductive material, and a guiding structure such as a chute or a convex platform for guiding the moving arc ignition plate 2 needs to be provided. When the arc ignition electromagnetic mechanism attracts the moving arc ignition plate 2, the moving arc ignition plate 2 slides linearly or arcuately along the guiding structure, which all fall within the protection scope of the present invention.

[0041] The static contact 13 includes a contact section provided with a static contact point, and an arc ignition angle section and a connection section respectively connected to both ends of the contact section. The arc ignition angle section is bent into an arc shape and extends towards the arc extinguishing chamber for introducing the arc into the arc extinguishing chamber. The arc ignition angle section is arranged opposite to the moving arc ignition plate 2, and an arc ignition channel is formed between the two. The connection section is electrically connected to the coil of the short-circuit release 18. Further, the connection section is also connected with a straight section, and the straight section extends to the upper side of the arc extinguishing chamber of the arc extinguishing chamber 14, so that the arc extinguishing chamber is located between the straight section and the static arc ignition plate 5.

[0042] In this embodiment, the static arc ignition plate 5 is provided with a rotating shaft structure 61, and the moving arc ignition plate 2 is provided with a sleeve structure 62. The sleeve structure 62 is sleeved on the rotating shaft structure 61 to rotatably connect the moving arc ignition plate 2 and the static arc ignition plate 5. The positions of the rotating shaft structure 61 and the sleeve structure 62 can also be interchanged. The sleeve structure 62 is provided on the static arc ignition plate 5, and the rotating shaft structure 61 is provided on the moving arc ignition plate 2, so that the rotating shaft structure 61 is inserted into the sleeve structure 62, that is, one of the static arc ignition plate 5 and the moving arc ignition plate 2 is provided with the rotating shaft structure 61, and the other of the static arc ignition plate 5 and the moving arc ignition plate 2 is provided with the sleeve structure 62. The sleeve structure 62 is sleeved on the rotating shaft structure 61 to rotatably connect the moving arc ignition plate 2 and the static arc ignition plate 5, which all fall within the protection scope of the present invention.

[0043] The rotating shaft structure 61 includes a first bending portion bent towards the side. On both sides of the first bending portion in the width direction, there are respectively provided protruding rotating shaft portions 611. The sleeve structure 62 includes two second bending portions 621 arranged opposite to each other in the width direction. The two second bending portions 621 are respectively bent towards the side to form sleeve portions. There is a space for inserting the first bending portion between the two sleeve portions. The two sleeve portions are respectively sleeved on the two rotating shaft portions 611 on both sides of the first bending portion to achieve rotational connection.

[0044] It is understandable that the moving pilot arc plate 2 and the static pilot arc plate 5 can also be rotationally connected in other ways. For example, through holes are provided on both the moving pilot arc plate 2 and the static pilot arc plate 5, and a shaft passing through the moving pilot arc plate 2 and the static pilot arc plate 5 is provided. Of course, an independent fixed shaft or a fixed shaft integrally formed with the housing 11 can also be provided to rotatably mount the moving pilot arc plate 2 on the fixed shaft, which all fall within the protection scope of the present invention.

[0045] Preferably, a corresponding limiting structure can be provided inside the housing 11 for limiting the static pilot arc plate 5 and the rotation range of the moving pilot arc plate 2.

[0046] The static pilot arc plate 5 of this embodiment has multiple functions at the same time. The static pilot arc plate 5 can not only play the role of rotatably mounting the moving pilot arc plate 2, but also play the role of attracting the arc to move towards the arc extinguishing chamber, without the need to additionally provide a separate part for mounting the moving pilot arc plate 2, and has the characteristic of a small number of parts.

[0047] As Figure 2 shown, the moving pilot arc plate 2 includes an arc-leading portion 21 in a straight plate shape. One end of the arc-leading portion 21 is provided with a sleeve structure 62 rotationally connected to the static pilot arc plate 5. The end of the arc-leading portion 21 away from the static pilot arc plate 5 is provided with an extension portion 22 protruding towards the moving contact 12. The arc-leading electromagnetic structure is arranged on the side of the arc-leading portion 21 away from the static contact 13 to attract the arc-leading portion 21. The extension portion 22 is located below the moving contact 12 in the open position. The extension portion 22 is arranged between the moving contact 12 and the arc-leading electromagnetic structure. The moving pilot arc plate 2 contacts the arc through the extension portion 22. When the switch is opened, the arc on the moving contact 12 jumps to the extension portion 22, and a current passing through the electromagnetic coil 4 is generated between the extension portion 22 and the main circuit. Preferably, the extension portion 22 and the arc-leading portion 21 are arranged at an oblique angle, and the thickness of the extension portion 22 is greater than that of the arc-leading portion 21. The sides of the extension portion 22 and the arc-leading portion 21 close to the static contact 13 are flush. The side of the extension portion 22 away from the static contact 13 is provided with a protruding connection block 23. The moving pilot arc plate 2 is connected to the electromagnetic coil 4 through a flexible connection 24. The connection block 23 is used for welding the flexible connection 24.

[0048] In this embodiment, by providing an extension portion 22 protruding towards the moving contact 12 on the arc ignition portion 21, not only can the effect of attracting the arc by the moving arc ignition plate 2 be improved, but also the extension portion 22 can contact the arc earlier than the arc ignition portion 21, thereby enabling the electromagnetic coil 4 of the arc ignition electromagnetic mechanism to induce a magnetic field for attracting the movement of the moving arc ignition plate 2 earlier. In addition, a connection block 23 can be provided on the side surface of the extension portion 22, and the connection block 23 can facilitate the welding of the flexible connection 24 and reduce the assembly difficulty. Of course, the extension portion 22 can also not be provided, and the arc ignition portion 21 can directly contact the arc, and then the electromagnetic coil 4 induces a magnetic field. In addition, the flexible connection 24 can also not be provided. The electromagnetic coil 4 itself also has a certain elasticity, and the electromagnetic coil 4 can be directly connected to the moving arc ignition plate 2, but the reliability after connection through the flexible connection 24 is higher and it is not easy to fall off.

[0049] Reference Figure 1 As shown, the static arc ignition plate 5 is horizontally arranged, the moving arc ignition plate 2 is inclined, and the extension portion 22 is arranged close to vertically, forming an integral arc ignition plate from the breaking position near the moving contact 12 to the arc extinguishing chamber. In the prior art, there is an arc ignition plate with a shape similar to the combination of the moving arc ignition plate 2 and the static arc ignition plate 5 in this embodiment, which is used to introduce the arc on the moving contact 12 into the arc extinguishing chamber, but the whole of this arc ignition plate is immovable. By providing the movable moving arc ignition plate 2 and the arc ignition electromagnetic mechanism in this embodiment, the arc can leave the moving and static contacts more quickly and move towards the arc extinguishing chamber 14, and the moving arc ignition plate 2 can also directly break part of the arc, which is not available in the prior art.

[0050] Such as Figure 1-2As shown, the arc striking electromagnetic mechanism is arranged on the side of the moving arc striking plate 2 away from the static contact 13, and the moving arc striking plate 2 is located between the static contact 13 and the arc striking electromagnetic mechanism. In this embodiment, the arc striking electromagnetic mechanism includes an electromagnetic coil 4 and an iron core 43 located inside the electromagnetic coil 4. The axis of the electromagnetic coil 4 is perpendicular to the arc striking portion 21 of the moving arc striking plate 2. Specifically, the electromagnetic coil 4 includes a coil portion 40 and a first connecting portion 41 and a second connecting portion 42 oppositely arranged at both axial ends of the coil portion 40. The housing 11 is provided with an installation groove for fixing the coil portion 40. An iron core 43 is arranged inside the coil portion 40. The iron core 43 and the electromagnetic coil 4 form an electromagnet as the arc striking electromagnetic mechanism, which can more easily attract the moving arc striking plate 2 to move. The electromagnetic coil 4 is used to magnetize the iron core 43, so that the iron core 43 attracts the arc striking plate to overcome the resistance of the arc striking elastic member 3 and move in the direction away from the static contact 13, and can more easily attract the moving arc striking plate 2 to move. The first connecting portion 41 is electrically connected to the extending portion 22 of the moving arc striking plate 2 through a flexible connection 24. The second connecting portion 42 is electrically connected to the bimetal of the overload release 19 through a fixing piece 44. The bimetal is electrically connected to the second terminal 172. The fixing piece 44 includes a first fixing portion 441 and a second fixing portion 442 connected at an oblique angle. The second connecting portion 42 is connected to the first fixing portion 441, and the side surface of the second fixing portion 442 is connected to the side surface of the bimetal. Of course, the fixing piece 44 can also adopt other shapes, or the fixing piece 44 can be omitted, so that the second connecting portion 42 is directly connected to the bimetal. In addition, the second connecting portion 42 may not be connected to the bimetal, and the second connecting portion 42 may also be connected to the second terminal 172 or other parts constituting the main circuit through a wire or other conductors, which all belong to the protection scope of the present invention.

[0051] As Figure 1As shown, the arc ignition elastic member 3 is disposed on the side of the arc ignition portion 21 away from the static contact 13. The arc ignition elastic member 3 is a torsion spring, which includes a spiral portion of a cylindrical structure, and a first spring arm 31 and a second spring arm 32 oppositely disposed at both ends of the spiral portion. The housing 11 is provided with a spring shaft 33, and the spiral portion of the arc ignition elastic member 3 is rotatably sleeved on the spring shaft 33. The second spring arm 32 contacts the housing 11, and the first spring arm 31 is used to push the side of the arc ignition portion 21 away from the static contact 13. A limiting structure (not shown in the figure) for blocking and limiting the moving arc ignition plate 2 is provided in the housing 11. The arc ignition elastic member 3 pushes the moving arc ignition plate 2 against the limiting structure for limiting, preventing the distance between the moving arc ignition plate 2 and the static contact 13 from being too close. When the moving arc ignition plate 2 in this embodiment is blocked by the limiting structure, the distance from the moving arc ignition plate 2 to the static contact 13 is 9.3 mm. The arc ignition elastic member 3 can attract the moving arc ignition plate 2 to move to a position about 12 mm away from the static contact 13. Of course, the arc ignition elastic member 3 can also be disposed at other positions. The arc ignition elastic member 3 can also be a cylindrical spring, a spring sheet, a plastic elastic arm integrally formed with the housing, etc., which all belong to the protection scope of the present invention; the distance from the moving arc ignition plate 2 to the static contact 13 here is only an example. Obviously, the initial distance from the moving arc ignition plate 2 to the static contact 13 and the distance after the moving arc ignition plate 2 is magnetically attracted and moved by the arc ignition electromagnetic mechanism can be adjusted according to needs.

[0052] As Figure 3 shown, a movable arc isolating structure 7 is provided in the housing 11 of this embodiment.

[0053] As Figure 4 shown, when the static contact 13 and the moving contact 12 are separated, the arc isolating structure 7 can move towards the direction close to the moving arc ignition plate 2 and move between the static contact 13 and the moving contact 12. The arc isolating structure 7 can isolate and switch the arc between the static contact 13 and the moving contact 12, and on the basis of cutting off the arc, can also lead the cut-off arc and the uncut arc to the moving arc ignition plate 2, so that the moving arc ignition plate 2 contacts the arc earlier, and thus a magnetic field for attracting the moving arc ignition plate 2 to move is generated earlier.

[0054] As Figure 5 shown, when the static contact 13 and the moving contact 12 are in contact, the arc isolating structure 7 can move away from the moving arc ignition plate 2 and move out between the static contact 13 and the moving contact 12 to avoid the moving contact 12, so that the moving contact 12 contacts the static contact 13. At this time, the contact position of the moving contact 12 and the static contact 13 is between the arc isolating structure 7 and the moving arc ignition plate 2, and the arc isolating structure 7 is located on the side of the moving contact 12 and the static contact 13 away from the moving arc ignition plate 2.

[0055] As Figure 3As shown in the figure, the arc separation structure 7 includes a rotating plate 71 and an arc separation plate 72. The rotating plate 71 is rotatably installed on the housing 11. The rotating plate 71 is provided with a rotating shaft 73, and the housing 11 is provided with a fixing hole for inserting the rotating shaft 73. The arc separation plate 72 is arranged at an eccentric position of the rotating plate 71. A driving groove 74 is provided on the rotating plate 71, and a driving rod 75 for inserting into the driving groove 74 is provided on the moving contact 12. When the moving contact 12 rotates, the rotating plate 71 is pushed by the driving rod 75, so that the rotating plate 71 drives the arc separation plate 72 to rotate around the rotating shaft 73, so that the arc separation plate 72 rotates between the static contact 13 and the moving contact 12, or moves away from between the static contact 13 and the moving contact 12.

[0056] In this embodiment, the moving contact 12 is connected to the arc separation structure 7 and can drive the arc separation structure 7 to rotate between the static contact 13 and the moving contact 12, or move out from between the static contact 13 and the moving contact 12. It should be noted that the arc separation structure 7 is not limited to being driven by the moving contact 12, and can also be directly or indirectly driven by the contact support, the handle or other linkages of the operating mechanism.

[0057] Furthermore, the movement trajectories of the driving groove 74 and the driving rod 75 are the same arc. The driving groove 74 includes two driving surfaces oppositely arranged on both sides of the movement direction of the driving rod 75, and the distance between the two driving surfaces is greater than the diameter of the driving rod 75. When the driving rod 75 pushes the two driving surfaces, the arc separation structure 7 can be driven to rotate in two opposite directions respectively. After the driving rod 75 separates from one of the driving surfaces and turns a certain angle in the driving groove 74, it contacts the other driving surface. Because the moving contact 12 rotates at a relatively large angle, the rotation angle of the arc separation structure 7 can be made smaller than that of the moving contact 12.

[0058] Finally, the arc extinguishing process of the circuit breaker in this preferred embodiment under the critical load current is described in conjunction with the drawings:

[0059] As Figure 1 shown, in the normal opening state, the distance between the moving arc guiding plate 2 and the static contact 13 is 9.3 mm as a reference value; in the case of breaking the critical load current, when the moving and static contacts are separated, an arc is generated. The arc separation structure 7 pulls the arc from the moving contact 12 to the moving arc guiding plate 2. At this time, there is current passing through the electromagnetic coil 4 and a magnetic field is induced. The embedded iron core 43 is magnetized. The moving arc guiding plate 2 rotates clockwise around the end connected to the static arc guiding plate 5 under the action of the magnetic force. As Figure 4 shown, after rotating a certain angle, it is limited by the limiting structure. At this time, the distance between the moving arc guiding plate 2 and the static contact 13 is ≥ 12 mm as a reference value, and the arc is broken; after the arc is extinguished, the moving arc guiding plate 2 returns to the initial position under the action of the arc guiding elastic member 3, thereby realizing the arc extinguishing of the DC circuit breaker and achieving effective breaking under the critical load current.

[0060] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is usually placed during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating relative importance.

[0061] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A switch, comprising an arc extinguishing chamber (14), a moving contact (12) and a static contact (13). The moving contact (12) and the static contact (13) are connected to the main circuit of the switch, and the arc extinguishing chamber (14) is used to extinguish the arc generated between the moving contact (12) and the static contact (13). It is characterized in that: An arc guiding mechanism is further provided. The arc guiding mechanism includes a moving arc guiding plate (2), an arc guiding elastic member (3) and an arc guiding electromagnetic mechanism. The arc guiding electromagnetic structure includes an electromagnetic coil (4). The moving arc guiding plate (2) is movably arranged. The arc guiding elastic member (3) is used to drive the arc guiding plate (2) to move closer to the static contact (13). Two ends of the electromagnetic coil (4) are respectively electrically connected to the moving arc guiding plate (2) and the main circuit. When the moving arc guiding plate (2) contacts the arc, a current passing through the electromagnetic coil (4) is generated between the moving arc guiding plate (2) and the main circuit, so that the electromagnetic coil (4) induces a magnetic field for attracting the moving arc guiding plate (2) to move, and drives the moving arc guiding plate (2) to move in a direction away from the static contact (13) against the resistance of the arc guiding elastic member (3).

2. The switch according to claim 1, wherein: The moving arc guiding plate (2) is rotatably arranged or slidably arranged.

3. The switch according to claim 1, wherein: The arc guiding mechanism further includes a static arc guiding plate (5). One end of the static arc guiding plate (5) close to the moving arc guiding plate (2) is rotatably connected to the moving arc guiding plate (2). The end of the static arc guiding plate (5) far from the moving arc guiding plate (2) extends to the side of the arc extinguishing chamber (14) far from the static contact (13). The moving arc guiding plate (2) can rotate around the end connected to the static arc guiding plate (5).

4. The switch according to claim 3, characterized in that: One of the static arc guiding plate (5) and the moving arc guiding plate (2) is provided with a rotating shaft structure (61), and the other of the static arc guiding plate (5) and the moving arc guiding plate (2) is provided with a sleeve structure (62). The sleeve structure (62) is sleeved on the rotating shaft structure (61) to rotatably connect the moving arc guiding plate (2) and the static arc guiding plate (5).

5. The switch according to claim 1, characterized in that: The moving arc guiding plate (2) includes an arc guiding portion (21) in a straight plate shape. One end of the arc guiding portion (21) is rotatably connected to the static arc guiding plate (5). The other end of the arc guiding portion (21) is provided with an extension portion (22) protruding towards the moving contact (12). The arc guiding electromagnetic structure is arranged on the side of the arc guiding portion (21) far from the static contact (13). The extension portion (22) is arranged between the moving contact (12) and the electromagnetic coil (4). The moving arc guiding plate (2) contacts the arc through the extension portion (22), and a current passing through the electromagnetic coil (4) is generated between the extension portion (22) and the main circuit.

6. The switch according to claim 5, characterized in that: The moving arc guiding plate (2) and the electromagnetic coil (4) are connected by a flexible connection (24). The thickness of the extension portion (22) is greater than the thickness of the arc guiding portion (21). The sides of the extension portion (22) and the arc guiding portion (21) close to the static contact (13) are flush. A protruding connection block (23) is provided on the side of the extension portion (22) far from the static contact (13). The connection block (23) is used for welding the flexible connection (24).

7. The switch according to claim 1, characterized in that: The axis of the electromagnetic coil (4) is perpendicular to the arc guiding portion (21) of the moving arc guiding plate (2).

8. The switch according to claim 1, wherein: The arc ignition mechanism further includes a static arc ignition plate (5). The dynamic arc ignition plate (2) is connected to the static arc ignition plate (5) through a wire or a bendable conductive material. The housing is provided with a guiding structure. When the arc ignition electromagnetic mechanism attracts the dynamic arc ignition plate (2), the dynamic arc ignition plate (2) slides linearly along the guiding structure.

9. The switch according to claim 1, characterized in that: It further includes a bimetallic strip. The bimetallic strip is connected to a terminal block, and the electromagnetic coil (4) is connected to the bimetallic strip.

10. The switch according to claim 9, characterized in that: It further includes a fixing piece (44) connected to the bimetallic strip. The fixing piece (44) includes a first fixing portion (441) and a second fixing portion (442) connected at an oblique angle. The electromagnetic coil (4) is connected to the first fixing portion (441), and the side surface of the second fixing portion (442) is connected to the side surface of the bimetallic strip.

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