Rapid arc cutting and extinguishing device

Abstract

The invention relates to a rapid arc cutting and extinguishing device which is installed in a circuit breaker and comprises a moving contact and a static contact, the static contact is fixedly connected with a circuit breaker base, a circuit breaker transmission mechanism drives the moving contact to move, the rapid arc cutting and extinguishing device further comprises an arc extinguishing assembly, the arc extinguishing assembly comprises an arc extinguishing insulating plate, a moving contact is arranged at one end, away from the circuit breaker, of the moving contact, and the moving contact is connected with the arc extinguishing insulating plate. The static contact is provided with a static contact point, the movable contact point and the static contact point are separated for opening or contacted for closing, and the arc extinguishing assembly is installed on the movable contact, the static contact or the circuit breaker base; in an opening state, the movable contact is separated from the static contact, and the arc extinguishing insulating plate is quickly inserted between the movable contact and the static contact; and in a switching-on state, the arc extinguishing insulating plate is quickly far away from the movable contact and the static contact, and the movable contact is in contact with the static contact. The arc extinguishing device can rapidly extinguish the arc when the arc is generated, the speed of the arc from generation to extinguishing is effectively increased, energy generated by the arc is reduced, and the arc extinguishing capacity is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a rapid arc cutting and arc extinguishing device. Background Art

[0002] In electrical systems, circuit breakers are an extremely important component. Whether it is a high-voltage power distribution system or a low-voltage control system, or even a circuit directly connected to electrical equipment, circuit breakers play a vital role. As one of the most commonly used protective circuit devices, circuit breakers play the role of connecting and disconnecting in the circuit, and also provide protection against overload and short circuit.

[0003] It can connect and disconnect the circuit under normal working conditions, facilitating the installation and maintenance of equipment. When an abnormal situation occurs in the circuit, the circuit breaker can react quickly and disconnect the circuit to prevent potential danger. This feature makes it an important safeguard in the field of electrical safety. When the current in the circuit exceeds its rated value, the circuit breaker can detect this abnormal situation. Whether it is due to equipment overload or circuit short circuit, the circuit breaker will respond quickly. Overload means that the current in the circuit is continuously higher than its normal operating range, which may be caused by excessive equipment load or improper circuit design. In this case, the circuit breaker will disconnect the circuit in time to avoid equipment damage or fire risk caused by excessive current.

[0004] The arc extinguishing device of the circuit breaker is responsible for disconnecting the current in the circuit to protect the circuit and equipment from damage. The core concept of the arc extinguishing device of the circuit breaker is to quickly extinguish the arc when the circuit breaker is operated, thereby disconnecting the current. The arc is a conductive channel composed of high-temperature ionized gas. If it is not controlled, it will cause equipment overheating, damage, and even fire. Therefore, the design and implementation of the arc extinguishing device is crucial to the safe and stable operation of the power system.

[0005] Chinese patent CN2017108880713 discloses a circuit breaker, including a contact device and an arc extinguishing device, wherein the contact device includes a static contact and a moving contact that moves between an open and a closed position, the static contact is provided with a static contact, the moving contact is provided with a moving contact that is separated from and in contact with the static contact, the arc extinguishing device is located above the static contact and is composed of a plurality of grid sheets stacked at intervals, the moving contact has an arc-strike angle for transferring the arc generated when the moving contact is separated from the static contact to the grid sheet at the top, and the electrical gap between the grid sheet located above the height position of the moving contact and the moving contact of the arc extinguishing device increases from top to bottom in the height direction of the arc extinguishing device, based on the position of the moving contact relative to the static contact when it is opened to the limit. It improves the electric field intensity distribution inside the arc extinguishing device and makes the electric field intensity distribution area uniform or concentrated toward the upper end of the arc extinguishing device, thereby weakening the arc and achieving the purpose of arc extinguishing, but it requires a certain reaction time to completely extinguish the arc, and it is impossible to quickly extinguish the arc when the arc is generated. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a fast arc cutting and arc extinguishing device, which can quickly extinguish the arc when it is generated, effectively increase the speed from arc generation to arc extinguishing, reduce the energy generated by the arc, and effectively improve the ability to extinguish the arc.

[0007] The present invention provides a fast arc cutting and arc extinguishing device, which is installed in a circuit breaker, and comprises a moving contact and a static contact. One end of the moving contact is connected to the circuit breaker through a moving contact rotating shaft, and the static contact is fixedly connected to the circuit breaker base. The circuit breaker transmission mechanism drives the moving contact to move. The device also comprises an arc extinguishing assembly, and the arc extinguishing assembly comprises an arc extinguishing insulating plate. The moving contact is provided with a moving contact at one end away from the circuit breaker, and the static contact is provided with a static contact. The moving contact and the static contact are separated for opening or contact for closing. The arc extinguishing assembly is installed on the moving contact or the static contact or the circuit breaker base; in the opening state, the moving contact is separated from the static contact, and the arc extinguishing insulating plate is inserted between the moving contact and the static contact; in the closing state, the arc extinguishing insulating plate is away from the moving contact and the static contact, and the moving contact is in contact with the static contact.

[0008] Preferably, the arc extinguishing assembly also includes an arc extinguishing wall plate, which is a concave plate with a hollow bottom. The moving contact is also equipped with an arc extinguishing wall plate shaft and an arc extinguishing insulating plate shaft, the arc extinguishing wall plate is installed on the arc extinguishing wall plate shaft, the moving contact is placed in the arc extinguishing wall plate, and the bottom surface is flush with the bottom surface of the arc extinguishing wall plate; the arc extinguishing insulating plate is an arc concave plate that matches the end of the moving contact and has an extension plate on the bottom side close to the moving contact, which is installed on the arc extinguishing insulating plate shaft; a torsion spring is installed on the arc extinguishing insulating plate shaft, one end of the torsion spring is fixed on the moving contact, and the other end is fixed on the arc extinguishing insulating plate; the arc extinguishing insulating plate is also provided with a limit plate, when in the closed state, the limit plate is abutted against the protruding portion of the static contact, the torsion spring is squeezed, and the extension plate is away from the moving contact, when in the open state, the limit plate is away from the protruding portion of the static contact, the torsion spring is restored, and the extension plate covers the moving contact.

[0009] Preferably, the arc extinguishing assembly includes an arc extinguishing wall plate, an arc extinguishing shaft and a magnet slot, the arc extinguishing wall plate is in the shape of a enclosure plate, the magnet slot is connected to the arc extinguishing insulating plate to form an arc extinguishing insulating member, two arc extinguishing insulating members and two arc extinguishing rotating shafts are each provided, the arc extinguishing insulating member is rotatably installed on the left and right sides of the top of the arc extinguishing wall plate through the arc extinguishing rotating shaft, the magnet slot is located on the outer side of the arc extinguishing wall plate, the arc extinguishing insulating plate is located on the inner side of the arc extinguishing wall plate, and the arc extinguishing insulating plates on the left and right sides are abutted against each other in a horizontal state; the static contact is located inside the arc extinguishing wall plate; in the open state, the two arc extinguishing insulating plates located on the inner side of the arc extinguishing wall plate are abutted against each other, the moving contact is located above the arc extinguishing wall plate, and there is a distance between the moving contact and the arc extinguishing insulating plate; in the closed state, the two arc extinguishing insulating plates located on the inner side of the arc extinguishing wall plate are separated, and the moving contact is located inside the arc extinguishing wall plate and contacts with the static contact.

[0010] Preferably, the arc extinguishing assembly further comprises a fixed groove, a transmission member, and a tension spring, wherein both side walls in the fixed groove are fixedly provided with corresponding transmission member fixed shafts and arc extinguishing insulating plate slide grooves; the transmission member is provided with a tension spring fixed protrusion, an arc extinguishing insulating plate limit block, a moving contact matching hole, and a transmission member slide groove, wherein the arc extinguishing insulating plate limit block is located at the bottom of the transmission member, and the transmission member fixed shaft is installed in the transmission member slide groove; the arc extinguishing insulating plate is installed in the arc extinguishing insulating plate slide groove; one end of the tension spring is fixed on the transmission member, and the other end is fixed On the arc extinguishing insulating plate; a mating shaft is also provided at the end of the moving contact away from the circuit breaker, the moving contact is located below the mating shaft, and the mating shaft is installed in the mating hole of the moving contact; in the open state, the moving contact is separated from the static contact, the arc extinguishing insulating plate covers the static contact, the moving contact is located above the arc extinguishing insulating plate, and there is a distance between the moving contact and the arc extinguishing insulating plate; in the closed state, the arc extinguishing insulating plate is away from the static contact, the arc extinguishing insulating plate limit block is against the end of the arc extinguishing insulating plate away from the static contact, and the moving contact is in contact with the static contact.

[0011] Preferably, the static contact is provided with a bending portion, and the thickness of the bending portion is 3-5 mm.

[0012] Preferably, the fixing groove is in the shape of a U-shaped groove.

[0013] Preferably, the moving contact is made of copper-nickel-plated material, a high-temperature resistant insulating coating is provided around the moving contact, and the moving contact is provided with an insulating protective cover.

[0014] Preferably, the static contact is made of nickel-plated copper material, a high-temperature resistant insulating coating is provided around the static contact, and the static contact is provided with an insulating protective cover.

[0015] Preferably, the arc extinguishing component is made of high temperature resistant insulating material.

[0016] Preferably, a screw hole is provided on the static contact, and the static contact is fixedly connected to the circuit breaker base by a screw passing through the screw hole.

[0017] The present invention has the following technical effects: The arc extinguishing component can quickly extinguish the arc when it is generated, effectively improving the speed from arc generation to extinguishing, reducing the energy generated by the arc, and effectively improving the ability to extinguish the arc. In the open state, when the moving contact and the static contact are separated, the arc extinguishing insulating plate is quickly inserted between the moving contact and the static contact to quickly extinguish the arc when the arc is generated; in the closed state, the arc extinguishing insulating plate quickly moves away from the moving contact and the static contact, reducing the time when the moving contact and the static contact are facing each other, and reducing the time and energy of the arc generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the closing structure of the rapid arc cutting and arc extinguishing device according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the breaking structure of the rapid arc cutting and arc extinguishing device according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the assembly structure of the moving contact and the torsion spring in Example 1 of the present invention; Figure 4 This is a schematic diagram of the arc extinguishing wall plate structure of Example 1 of the present invention; Figure 5 This is a schematic diagram of the structure of the circuit breaker assembled with Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the breaking structure of the rapid arc cutting and arc extinguishing device according to Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the closing structure of the rapid arc cutting and arc extinguishing device according to Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of the side view of the split circuit breaker of the rapid arc cutting and arc extinguishing device according to embodiment 2 of the present invention; Fig. 9This is a schematic diagram of the closing side structure of the rapid arc cutting and arc extinguishing device according to embodiment 2 of the present invention; Fig.10 For the present invention Fig. 9 Schematic diagram of the cross section at AA; Fig.11 For the present invention Fig.10 A partial enlarged view of point B in the middle; Fig.12 This is a schematic diagram of the assembly structure of the arc-extinguishing wall plate and the arc-extinguishing insulating member when the moving contact and the static contact are closed in Embodiment 2 of the present invention; Fig.13 This is a schematic structural diagram of the closing (fixed slot part omitted) of the rapid arc cutting and arc extinguishing device of Embodiment 3 of the present invention; Fig.14 This is a schematic diagram of the structure of the quick arc cutting and arc extinguishing device of Example 3 of the present invention (the fixed slot part is omitted); Fig.15 This is a schematic diagram of the structure of the fixed groove of the rapid arc cutting and arc extinguishing device according to Embodiment 3 of the present invention; Fig.16 This is a schematic diagram of the transmission structure of the rapid arc cutting and arc extinguishing device according to Embodiment 3 of the present invention; Fig.17 This is a schematic diagram of the structure of the arc extinguishing insulating plate of the rapid arc cutting and arc extinguishing device of Example 3 of the present invention; Fig.18 This is a schematic diagram of the structure of a rapid arc cutting and arc extinguishing device according to Embodiment 3 of the present invention installed in a circuit breaker.

[0019] In the figure: 1. moving contact; 11. moving contact point; 12. moving contact shaft; 13. arc extinguishing wall plate shaft; 14. arc extinguishing insulation plate shaft; 15. torsion spring installation groove; 16. fillet; 17. matching shaft; 2. stationary contact; 21. stationary contact point; 22. stationary contact protrusion; 23. stationary contact fixing hole; 3. arc extinguishing assembly; 31. arc extinguishing insulation plate; 32. extension plate; 33. limit plate; 34. arc extinguishing insulation member; 35. Magnet slot; 36, arc extinguishing wall plate; 4, arc extinguishing shaft; 5, transmission member; 51, tension spring fixing protrusion; 52, arc extinguishing insulating plate limit block; 53, moving contact matching hole; 54, transmission member slide groove; 56, tension spring fixing block; 6, fixing groove; 61, transmission member fixing shaft; 62, arc extinguishing insulating plate slide groove; 7, transmission mechanism; 8, tension spring; 9, torsion spring; 10, circuit breaker; 101, circuit breaker base. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings.

[0021] Example 1 like Figures 1 to 5As shown, the present invention provides a fast arc cutting and arc extinguishing device, which is installed in a circuit breaker 10, and includes a moving contact 1 and a stationary contact 2. One end of the moving contact 1 is connected to the circuit breaker 10 through a moving contact shaft 12, and the stationary contact 2 is fixedly connected to a circuit breaker base 101. The transmission mechanism 7 of the circuit breaker 10 drives the moving contact 1 to move. It also includes an arc extinguishing component 3, and the arc extinguishing component 3 includes an arc extinguishing insulating plate 31. The moving contact 1 is provided with a moving contact at one end away from the circuit breaker 10. Point 11, the static contact 2 is provided with a static contact 21, the moving contact 11 and the static contact 21 are separated to open the circuit or contact to close the circuit, and the arc extinguishing assembly 3 is installed on the moving contact 1; in the open state, the moving contact 11 and the static contact 21 are separated, and the arc extinguishing insulating plate 31 is quickly inserted between the moving contact 11 and the static contact 21; in the closed state, the arc extinguishing insulating plate 31 is quickly away from the moving contact 11 and the static contact 21, and the moving contact 11 is in contact with the static contact 21.

[0022] like Figure 4 As shown, the arc extinguishing assembly 3 also includes an arc extinguishing wall plate 36, which is a concave plate with a hollow bottom. The moving contact 1 is also equipped with an arc extinguishing wall plate shaft 13 and an arc extinguishing insulating plate shaft 14. The arc extinguishing wall plate 36 is installed on the arc extinguishing wall plate shaft 13. The moving contact 11 is placed in the arc extinguishing wall plate 36, and the bottom surface is flush with the bottom surface of the arc extinguishing wall plate 36; the arc extinguishing insulating plate 31 is an arc concave plate that matches the end of the moving contact 1 and has an extension plate 32 on the bottom side close to the moving contact 11. It is installed on the arc extinguishing wall plate shaft 13. On the arc insulating plate shaft 14; a torsion spring 9 is installed on the arc extinguishing insulating plate shaft 14, one end of the torsion spring 9 is fixed on the moving contact 1, and the other end is fixed on the arc extinguishing insulating plate 31; the arc extinguishing insulating plate 31 is also provided with a limit plate 33, when in the closed state, the limit plate 33 is against the static contact protrusion 22, the torsion spring 9 is squeezed, and the extension plate 32 is away from the moving contact 11, when in the open state, the limit plate 33 is away from the static contact protrusion 22, the torsion spring 9 is restored, and the extension plate 32 covers the moving contact 11.

[0023] When the moving contact 11 and the static contact 21 are about to contact, an arc will be generated between the moving contact 11 and the static contact 21. When the moving contact 11 approaches the static contact 21, the moving contact 11 is isolated by the arc-extinguishing insulating plate 31. Only when the moving contact 11 is about to contact the static contact 21, the limit plate 33 abuts against the static contact protrusion 22, so that the arc-extinguishing insulating plate 31 is separated from the moving contact 11, which greatly reduces the generation of arcs when the moving contact 11 and the static contact 21 are closed. When the moving contact 11 contacts the static contact 21, the circuit is turned on, the limit plate 33 abuts against the static contact protrusion 22, the torsion spring 9 is squeezed, and the extension plate 32 is away from the moving contact 11. At this time, the torsion spring 9 squeezes and accumulates energy. When the moving contact 11 and the stationary contact 21 are separated, the switch is opened and the circuit is disconnected. At this time, an arc is generated. When separated, the limit plate 33 breaks away from the stationary contact protrusion 22, and the torsion spring 9 quickly recovers, driving the arc extinguishing insulating plate 31 to rotate quickly, so that the extension plate 32 is quickly inserted between the moving contact 11 and the stationary contact 21, so that the moving contact 11 and the stationary contact 21 are disconnected at a high speed, and the arc can be extinguished quickly when the arc is generated, effectively improving the speed from the generation to the extinguishing of the arc of the circuit breaker 10, reducing the energy generated by the arc, and effectively improving the arc extinguishing ability of the circuit breaker 10.

[0024] By placing the moving contact 11 in the arc extinguishing wall plate 36, the possibility of arc generation from other surfaces is eliminated, and the arc generation around is reduced, so that arc extinguishing is faster and more convenient.

[0025] The arc extinguishing chamber is formed by wrapping the raised part of the moving contact 11 around the arc extinguishing wall plate 36 and the arc extinguishing insulating plate 31, thereby eliminating the possibility of arc re-ignition after arc cutting, protecting the moving contact 11 and the static contact 21 from electrical corrosion, and improving the service life of the circuit breaker 10.

[0026] like Figure 3 As shown, the moving contact 1 is provided with a torsion spring installation groove 15, one end of the torsion spring 9 is fixed on the torsion spring installation groove 15, and the other end is fixed on the arc-extinguishing insulating plate 31. The torsion spring 9 is more firmly installed in the moving contact 1.

[0027] The moving contact 1 is made of copper-nickel-plated material, a high-temperature resistant insulating coating is provided around the moving contact 11, and the moving contact 1 is provided with an insulating protective sleeve.

[0028] The static contact 21 is made of nickel-plated copper, a high-temperature resistant insulating coating is provided around the static contact 21, and the static contact 2 is provided with an insulating protective sleeve.

[0029] The arc extinguishing component 3 is made of high temperature resistant insulating material.

[0030] The stationary contact 2 is provided with a screw hole, and the stationary contact 2 is fixedly connected to the circuit breaker base 101 by means of a screw passing through the screw hole.

[0031] Example 2 like Figures 6 to 10 As shown, a fast arc cutting and arc extinguishing device is installed in a circuit breaker, which includes a moving contact 1 and a static contact 2. One end of the moving contact 1 is connected to the circuit breaker through a moving contact shaft 12, and the static contact 2 is fixedly connected to the circuit breaker base. The circuit breaker transmission mechanism 7 drives the moving contact 1 to move. It also includes an arc extinguishing assembly 3, and the arc extinguishing assembly 3 includes an arc extinguishing insulating plate 31. The moving contact 1 is provided with a moving contact 11 at one end away from the circuit breaker, and the static contact 2 is provided with a static contact 21. The moving contact 11 and the static contact 21 are separated to open the circuit or contact to close the circuit. The arc extinguishing assembly 3 is installed on the circuit breaker base; in the open state, the moving contact 11 is separated from the static contact 21, and the arc extinguishing insulating plate 31 is quickly inserted between the moving contact 11 and the static contact 21; in the closed state, the arc extinguishing insulating plate 31 is quickly away from the moving contact 11 and the static contact 21, and the moving contact 11 is in contact with the static contact 21.

[0032] like Fig.12As shown, the arc extinguishing assembly 3 includes an arc extinguishing wall plate 36, an arc extinguishing shaft 4 and a magnet slot 35. The arc extinguishing wall plate 36 is in the shape of a fence and is installed on the circuit breaker base. The magnet slot 35 is connected with the arc extinguishing insulating plate 31 to form an arc extinguishing insulating member 34. The arc extinguishing insulating member 34 and the arc extinguishing shaft 4 are each provided with two. The arc extinguishing insulating member 34 is rotatably installed on the left and right sides of the top of the arc extinguishing wall plate 36 through the arc extinguishing shaft 4. The magnet slot 35 is located on the outer side of the arc extinguishing wall plate 36. The arc extinguishing insulating plate 31 is located at the outer side of the arc extinguishing wall plate 36. On the inner side of the arc extinguishing wall plate 36, the arc extinguishing insulating plates 31 on the left and right sides are abutted against each other in a horizontal state; the static contact 21 is located inside the arc extinguishing wall plate 36; in the open state, the two arc extinguishing insulating plates 31 located on the inner side of the arc extinguishing wall plate 36 are abutted against each other, and the moving contact 11 is located above the arc extinguishing wall plate 36 and there is a distance between it and the arc extinguishing insulating plates 31; in the closed state, the two arc extinguishing insulating plates 31 located on the inner side of the arc extinguishing wall plate 36 are separated, and the moving contact 11 is located inside the arc extinguishing wall plate 36 and contacts with the static contact 21. In the unclosed state, the two arc-extinguishing insulating plates 31 located on the inner side of the arc-extinguishing wall plate 36 abut against each other to physically separate the moving contact 11 from the static contact 21. In order to close the circuit with the static contact 21 of the static contact 2, the moving contact 1 rotates the arc-extinguishing insulating plate 31 around the rotating shaft under the external force applied by the circuit breaker, so that the arc-extinguishing insulating plate 31 is separated by a certain angle until the moving contact 11 is completely in contact with the static contact 21. Under the action of the external force, the moving contact 1 maintains the contact state with the static contact 21, shortening the arc-burning time of closing the circuit, improving the breaking capacity of the circuit breaker, and improving the life of the circuit breaker. When opening the circuit, the moving contact 11 rotates rapidly in the direction away from the static contact 21, and the force acting on the arc-extinguishing insulating plate 31 disappears rapidly, so that the arc-extinguishing insulating plate 31 is no longer hindered by the moving contact 1. The arc-extinguishing insulating member 34 moves rapidly under the gravity of the magnet in the magnet slot 35 when it is not affected by the force of the moving contact 1. The arc-extinguishing insulating member 34 rotates rapidly along the arc-extinguishing shaft 4 until the two arc-extinguishing insulating plates 31 are in a horizontal state and are against each other without external force, and the arc-extinguishing insulating member 34 is closed. Since the arc-extinguishing insulating member 34 can rotate around the arc-extinguishing shaft 4, the arc-extinguishing insulating plates 31 in the two arc-extinguishing insulating members 34 are closed by their own gravity, completing the arc-cutting action. In this way, the arc-extinguishing insulating plates 31 in the arc-extinguishing insulating member 34 installed on the left and right sides of the arc-extinguishing wall plate 36 can be quickly inserted between the moving contact 11 and the static contact 21 to cut off the arc as soon as the moving contact 11 and the static contact 21 are disconnected, and the arc is quickly cut off to achieve arc cutting. At the same time, the arc-extinguishing insulating member 34, the arc-extinguishing wall plate 36 and the static contact 2 form a closed high-temperature resistant insulating arc-extinguishing chamber, which accelerates the extinguishing of the generated tiny arc and reduces the arc energy from the source.

[0033] like Fig.11As shown, the movable contact 1 is provided with a rounded corner portion 16 at one end close to the movable contact point 11. When the switch is in the closed state, the rounded corner portion 16 abuts against the arc-extinguishing insulating plate 31, so that the movable contact 1 can be more wear-resistant and has a longer service life.

[0034] A permanent magnet is arranged in the magnet slot 35, with the N pole of the permanent magnet facing upward and the S pole facing downward. The magnetic field of the permanent magnet in the magnet slot 35 can change the motion trajectory of the tiny arc in the high temperature resistant insulating arc extinguishing chamber when the switch is opened, and accelerate the arc extinguishing. The arc cutting and magnetic arc extinguishing are combined to achieve a stronger arc extinguishing effect and a stronger breaking capacity of the circuit breaker.

[0035] like Figure 8 , Fig. 9 As shown, the static contact 2 is provided with a bending portion, and the thickness of the bending portion is 3-5 mm.

[0036] The moving contact 1 is made of copper-nickel-plated material, a high-temperature resistant insulating coating is provided around the moving contact 11, and the moving contact 1 is provided with an insulating protective sleeve.

[0037] The static contact 21 is made of nickel-plated copper, a high-temperature resistant insulating coating is provided around the static contact 21, and the static contact 2 is provided with an insulating protective sleeve.

[0038] The arc extinguishing component 3 is made of high temperature resistant insulating material.

[0039] The static contact 2 is provided with a screw hole, and the static contact 2 is fixedly connected to the circuit breaker base by means of a screw passing through the screw hole.

[0040] Example 3 like Figures 13 to 14 As shown, a fast arc cutting and arc extinguishing device is installed in a circuit breaker 10, which includes a moving contact 1 and a stationary contact 2. One end of the moving contact 1 is connected to the circuit breaker 10 through a moving contact shaft 12, and the stationary contact 2 is fixedly connected to a circuit breaker base 101. The transmission mechanism 7 of the circuit breaker 10 drives the moving contact 1 to move. It also includes an arc extinguishing component 3, and the arc extinguishing component 3 includes an arc extinguishing insulating plate 31. The moving contact 1 is provided with a moving contact 11 at one end away from the circuit breaker 10. The static contact 2 is provided with a static contact 21, and the moving contact 11 is separated from the static contact 21 for opening or contacting for closing, and the arc extinguishing assembly 3 is installed on the moving contact 1; in the opening state, the moving contact 11 is separated from the static contact 21, and the arc extinguishing insulating plate 31 is quickly inserted between the moving contact 11 and the static contact 21; in the closing state, the arc extinguishing insulating plate 31 is quickly away from the moving contact 11 and the static contact 21, and the moving contact 11 is in contact with the static contact 21.

[0041] The arc extinguishing assembly 3 also includes a fixing slot 6, a transmission member 5, and a tension spring 8. Fig.15As shown, the inner side walls of the fixing groove 6 are fixed with corresponding transmission member fixing shafts 61 and arc-extinguishing insulation plate sliding grooves 62; Fig.16 As shown, the transmission member 5 is provided with a tension spring fixing protrusion 51, an arc-extinguishing insulating plate limit block 52, a moving contact matching hole 53, and a transmission member slide groove 54. The arc-extinguishing insulating plate limit block 52 is located at the bottom of the transmission member 5, and the transmission member fixing shaft 61 is installed in the transmission member slide groove 54; the arc-extinguishing insulating plate 31 is installed in the arc-extinguishing insulating plate slide groove 62; one end of the tension spring 8 is fixed on the transmission member 5, and the other end is fixed on the arc-extinguishing insulating plate 31; the moving contact 1 is also provided with a matching shaft 17 at the end away from the circuit breaker 10, and the moving contact Point 11 is located below the matching shaft 17, and the matching shaft 17 is installed in the matching hole 53 of the moving contact; in the open state, the moving contact 11 is separated from the static contact 21, the arc-extinguishing insulating plate 31 covers the static contact 21, and the moving contact 11 is located above the arc-extinguishing insulating plate 31, and there is a gap between the arc-extinguishing insulating plate 31; in the closed state, the arc-extinguishing insulating plate 31 is away from the static contact 21, the arc-extinguishing insulating plate limit block 52 abuts against the end of the arc-extinguishing insulating plate 31 away from the static contact 21, and the moving contact 11 contacts the static contact 21. The transmission member fixed shaft 61 cooperates with the transmission member slide groove 54 to limit the relative position of the transmission member 5 and the fixed groove 6; the arc-extinguishing insulating plate slide groove 62 cooperates with the arc-extinguishing insulating plate 31 to make the arc-extinguishing insulating plate 31 move along the arc-extinguishing insulating plate slide groove 62. By using the tension spring 8 to cooperate with the transmission member 5 and the arc-extinguishing insulating plate 31, the moving contact 1 drives the transmission member slide groove 54 of the transmission member 5 to move along the transmission member fixed axis 61. The tension spring 8 will expand and contract as the position of the transmission member 5 changes, thereby driving the arc-extinguishing insulating plate 31 to move, thereby achieving rapid arc cutting and arc extinguishing.

[0042] When the moving contact 1 and the stationary contact 2 are closed, the transmission mechanism 7 of the circuit breaker 10 rotates with the moving contact 1, so that the moving contact 11 approaches the stationary contact 21, and the tension spring 8 is gradually compressed from the extended state. When the moving contact 11 is about to contact the stationary contact 21, the tension spring 8 quickly recovers from the compressed state and extends, and moves with the arc extinguishing insulating plate 31, so that the arc extinguishing insulating plate 31 is separated from the stationary contact 21, and the moving contact 11 is completely in contact with the stationary contact 21. At this time, the arc extinguishing device completes the closing action.

[0043] When the moving contact 1 and the stationary contact 2 are opened, the moving contact 11 and the stationary contact 21 are separated, forming a voltage drop and generating an arc. At this time, the tension spring 8 is compressed, and the arc extinguishing insulating plate 31 is quickly inserted between the moving contact 11 and the stationary contact 21 under the restriction of the arc extinguishing insulating plate slide groove 62 and the thrust of the tension spring 8, and the arc is quickly cut off, thereby reducing the generation of arcs from the source, quickly extinguishing the arc, and reducing the damage of the arc to the circuit breaker 10.

[0044] like Fig.17As shown, the arc-extinguishing insulating plate chute 62 is in a slope shape with one end close to the static contact 21 lower than the end away from the static contact 21. Since the arc-extinguishing insulating plate chute 62 is in a slope shape with one end close to the static contact 21 lower than the end away from the static contact 21, when the moving contact 1 and the static contact 2 are disconnected, the arc-extinguishing insulating plate 31 increases the effect of its own gravity in the process of approaching the static contact 21, and can be inserted between the moving contact 11 and the static contact 21 more quickly, and the arc can be cut off more quickly.

[0045] The transmission member 5 is provided with a tension spring fixing protrusion 51 at one end away from the moving contact 1, and the arc extinguishing insulating plate 31 is provided with a tension spring fixing block 56 at one end away from the static contact 21. One end of the tension spring 8 is fixed to the tension spring fixing protrusion 51, and the other end is fixed to the tension spring fixing block 56.

[0046] The static contact 2 is provided with a bending portion, and the thickness of the bending portion is 3-5 mm.

[0047] The fixing groove 6 is in a U-shaped groove shape.

[0048] The moving contact 1 is made of copper-nickel-plated material, a high-temperature resistant insulating coating is provided around the moving contact 11, and the moving contact 1 is provided with an insulating protective sleeve.

[0049] The static contact 21 is made of nickel-plated copper, a high-temperature resistant insulating coating is provided around the static contact 21, and the static contact 2 is provided with an insulating protective sleeve.

[0050] The arc extinguishing component 3 is made of high temperature resistant insulating material.

[0051] like Fig.18 As shown, a screw hole is provided on the static contact 2, and the static contact 2 is fixedly connected to the circuit breaker base 101 by means of a screw passing through the screw hole.

[0052] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A fast arc cutting and arc extinguishing device, installed in a circuit breaker, comprising a moving contact and a stationary contact, wherein one end of the moving contact is connected to the circuit breaker through a moving contact shaft, and the stationary contact is fixedly connected to a circuit breaker base, and a circuit breaker transmission mechanism drives the moving contact to move, characterized in that: It also includes an arc extinguishing component, which includes an arc extinguishing insulating plate. The moving contact is provided with a moving contact at one end away from the circuit breaker, and the static contact is provided with a static contact. The moving contact and the static contact are separated to open the circuit or contact to close the circuit. The arc extinguishing component is installed on the moving contact or the static contact or the circuit breaker base; in the open state, the moving contact is separated from the static contact, and the arc extinguishing insulating plate is inserted between the moving contact and the static contact; in the closed state, the arc extinguishing insulating plate is away from the moving contact and the static contact, and the moving contact is in contact with the static contact.

2. A rapid arc cutting and arc extinguishing device according to claim 1, characterized in that: The arc extinguishing assembly also includes an arc extinguishing wall plate, which is a concave plate with a hollow bottom. The moving contact is also equipped with an arc extinguishing wall plate shaft and an arc extinguishing insulating plate shaft. The arc extinguishing wall plate is installed on the arc extinguishing wall plate shaft, and the moving contact is placed in the arc extinguishing wall plate, and the bottom surface is flush with the bottom surface of the arc extinguishing wall plate; the arc extinguishing insulating plate is an arc concave plate that matches the end of the moving contact and has an extension plate on the bottom side close to the moving contact, which is installed on the arc extinguishing insulating plate shaft; a torsion spring is installed on the arc extinguishing insulating plate shaft, one end of the torsion spring is fixed on the moving contact, and the other end is fixed on the arc extinguishing insulating plate; the arc extinguishing insulating plate is also provided with a limit plate, when in the closed state, the limit plate is against the protruding part of the static contact, the torsion spring is squeezed, and the extension plate is away from the moving contact, when in the open state, the limit plate is away from the protruding part of the static contact, the torsion spring is restored, and the extension plate covers the moving contact.

3. A rapid arc cutting and arc extinguishing device according to claim 1, characterized in that: The arc extinguishing assembly includes an arc extinguishing wall plate, an arc extinguishing shaft and a magnet slot. The arc extinguishing wall plate is in the shape of a surrounding plate. The magnet slot is connected with the arc extinguishing insulating plate to form an arc extinguishing insulating member. Two arc extinguishing insulating members and two arc extinguishing rotating shafts are provided. The arc extinguishing insulating members are rotatably installed on the left and right sides of the top of the arc extinguishing wall plate through the arc extinguishing rotating shaft. The magnet slot is located on the outer side of the arc extinguishing wall plate, and the arc extinguishing insulating plate is located on the inner side of the arc extinguishing wall plate, and the arc extinguishing insulating plates on the left and right sides are abutted against each other in a horizontal state; the static contact is located in the arc extinguishing wall plate; in the open state, the two arc extinguishing insulating plates located on the inner side of the arc extinguishing wall plate are abutted against each other, and the moving contact is located above the arc extinguishing wall plate and has a distance from the arc extinguishing insulating plate; in the closed state, the two arc extinguishing insulating plates located on the inner side of the arc extinguishing wall plate are separated, and the moving contact is located in the arc extinguishing wall plate and contacts with the static contact.

4. A rapid arc cutting and arc extinguishing device according to claim 1, characterized in that: The arc extinguishing assembly also includes a fixed groove, a transmission member, and a tension spring. The inner side walls of the fixed groove are fixed with corresponding transmission member fixed shafts and arc extinguishing insulating plate slide grooves; the transmission member is provided with a tension spring fixed protrusion, an arc extinguishing insulating plate limit block, a moving contact matching hole, and a transmission member slide groove. The arc extinguishing insulating plate limit block is located at the bottom of the transmission member, and the transmission member fixed shaft is installed in the transmission member slide groove; the arc extinguishing insulating plate is installed in the arc extinguishing insulating plate slide groove; one end of the tension spring is fixed on the transmission member, and the other end is fixed on the extinguishing member. The moving contact is on the arc-extinguishing insulating plate; a mating shaft is also provided at one end of the moving contact away from the circuit breaker, the moving contact is located below the mating shaft, and the mating shaft is installed in the mating hole of the moving contact; in the open state, the moving contact is separated from the static contact, the arc-extinguishing insulating plate covers the static contact, the moving contact is located above the arc-extinguishing insulating plate, and there is a distance between the moving contact and the arc-extinguishing insulating plate; in the closed state, the arc-extinguishing insulating plate is away from the static contact, the arc-extinguishing insulating plate limit block is against the end of the arc-extinguishing insulating plate away from the static contact, and the moving contact is in contact with the static contact.

5. A rapid arc cutting and arc extinguishing device according to claim 3 or 4, characterized in that: The static contact is provided with a bending portion, and the thickness of the bending portion is 3-5 mm.

6. A rapid arc cutting and arc extinguishing device according to claim 4, characterized in that: The fixing groove is in a U-shaped groove shape.

7. A rapid arc cutting and arc extinguishing device according to claim 1, characterized in that: The moving contact is made of copper-nickel-plated material, a high-temperature resistant insulating coating is provided around the moving contact, and the moving contact is provided with an insulating protective cover.

8. The rapid arc cutting and arc extinguishing device according to claim 1, characterized in that: The static contact is made of copper-nickel-plated material, a high-temperature resistant insulating coating is arranged around the static contact, and the static contact is provided with an insulating protective sleeve.

9. The rapid arc cutting and arc extinguishing device according to claim 1, characterized in that: The arc extinguishing component is made of high temperature resistant insulating material.

10. The rapid arc cutting and arc extinguishing device according to claim 1, characterized in that: The static contact is provided with a screw hole, and the static contact is fixedly connected to the circuit breaker base by a screw passing through the screw hole.

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