Rapid arc extinguishing device and circuit breaker comprising same

Abstract

The utility model relates to a quick arc extinguishing device and a circuit breaker comprising the quick arc extinguishing device, the quick arc extinguishing device is connected with a transmission mechanism of the circuit breaker, the quick arc extinguishing device comprises a moving contact, a static contact, an arc extinguishing insulating plate and an arc extinguishing wall plate, the moving contact comprises a moving contact, the static contact comprises a static contact and a static contact protruding part, and the static contact protruding part is connected with the arc extinguishing insulating plate. The moving contact comprises a moving contact rotating shaft which is connected with a transmission mechanism of the circuit breaker, and the moving contact and the static contact are in contact closing or separated opening; the torsion spring is connected with the moving contact and the arc extinguishing insulating plate, the arc extinguishing insulating plate is further provided with a limiting plate, the closing state limiting plate abuts against the protruding part of the static contact, the torsion spring extrudes, the extension plate is far away from the moving contact, the opening state limiting plate is far away from the protruding part of the static contact, the torsion spring restores, and the extension plate covers the moving contact. The arc extinguishing device can rapidly extinguish an arc when the arc is generated, effectively improves the speed of the arc of the circuit breaker from generation to extinguishing, reduces the energy generated by the arc, and effectively improves the arc extinguishing capability of the circuit breaker.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the circuit breaker equipment technical field, especially relates to a kind of quick arc extinguishing device and including quick arc extinguishing device's circuit breaker. BACKGROUND

[0002] Circuit breaker is widely used in high-low voltage distribution system and control system and electrical equipment, is one of the most common protective circuit devices, mainly used for the control circuit is connected and disconnected, and provides overload and short-circuit protection, can automatically disconnect circuit when detecting overload or short circuit, prevent electrical equipment damage or cause fire.

[0003] Circuit breaker is mainly composed of insulating shell, contact system, operating mechanism, release and arc extinguishing system.When circuit short-circuit fault, through the current of circuit breaker increases, the magnetic field generated by current overcomes the repulsive force spring, release pulls operating mechanism action, dynamic, static contact breaker, circuit is disconnected, realizes circuit protection;When circuit overload, through the current of circuit breaker increases, heat release, bimetallic strip deforms to a certain extent and drives operating mechanism action, dynamic, static contact breaker, circuit is disconnected, realizes circuit protection.

[0004] The arc extinguishing ability of circuit breaker is a key indicator, the higher its arc extinguishing ability, the better the breaking effect and the better the contact protection, so the longer the device running time. Therefore, designing effective arc extinguishing technology to quickly extinguish arc is a key link in power equipment design.

[0005] At present, the arc extinguishing system of circuit breaker mostly uses the rapid movement of moving contact to lengthen arc, quickly forms voltage drop, and uses arc extinguishing grid in arc extinguishing chamber to cut off arc, so that the temperature of arc is quickly reduced to extinguish arc. The arc generated in the process of circuit breaker breaker is completely extinguished by arc extinguishing grid in arc extinguishing chamber, and the effect of arc extinguishing is determined by the capacity of arc extinguishing chamber, and the speed of opening and closing of moving contact and the structure of arc extinguishing grid directly affect the arc extinguishing effect. The improvement of circuit breaker arc extinguishing system is mainly reflected in improving the speed of arc entering arc extinguishing chamber and the speed of arc generation to division, but still does not fundamentally reduce the arc energy.

[0006] Chinese patent CN207199555U discloses a circuit breaker, comprising a contact device and an arc extinguishing device, the contact device comprising a static contact and a moving contact acting between open and closed positions, the static contact being provided with a static contact point, the moving contact being provided with a moving contact point separating and contacting with the static contact point, the arc extinguishing device being located above the static contact point and being composed of a plurality of spaced grid sheets, the moving contact having an arc guiding angle for transferring the arc generated when the moving contact point separates from the static contact point to the top grid sheet, the electrical gap between the grid sheet above the height position of the moving contact point and the moving contact increasing from top to bottom in the height direction of the arc extinguishing device based on the position of the moving contact when the moving contact opens to the limit relative to the static contact. It improves the electric field intensity distribution inside the arc extinguishing device and makes the electric field intensity distribution area uniform or concentrated to the upper end of the arc extinguishing device, thereby weakening the arc and achieving the purpose of arc extinguishing, but it needs a certain reaction time for complete arc extinguishing and cannot quickly extinguish the arc when the arc is generated. Content of the utility model

[0007] The utility model solves the technical problem to provide a kind of quick arc extinguishing device and including quick arc extinguishing device's circuit breaker, when arc can be quickly extinguished arc, effectively promote the speed of circuit breaker arc from generation to extinguishing, reduce arc generation energy, effectively promote the arc extinguishing capacity of circuit breaker.

[0008] The utility model provides a kind of quick arc extinguishing device, with the transmission mechanism of circuit breaker is connected, including moving contact, static contact, arc extinguishing insulating plate, arc extinguishing wallboard, the moving contact includes moving contact point, the static contact includes static contact point and static contact protruding portion, the moving contact is fixedly installed with moving contact pivot, the moving contact pivot is connected with the transmission mechanism of circuit breaker, the moving contact point and static contact point contact and separate closing or opening;The moving contact is also installed with arc extinguishing wallboard shaft and arc extinguishing insulating plate shaft, the arc extinguishing wallboard is the concave plate of bottom hollow appearance, it is installed in arc extinguishing wallboard shaft, the moving contact point is placed in arc extinguishing wallboard, and bottom surface is flush with arc extinguishing wallboard bottom surface;The arc extinguishing insulating plate is the arc concave plate of with moving contact end portion matching and bottom edge near moving contact point side is equipped with extension plate, it is installed in arc extinguishing insulating plate shaft;Torsion spring is installed on the arc extinguishing insulating plate shaft, one end of the torsion spring is fixed on the moving contact, the other end is fixed on the arc extinguishing insulating plate;The arc extinguishing insulating plate is also equipped with limit stop, limit stop and static contact protruding portion are abutted in closing state, torsion spring is extruded, extension plate is far from moving contact point, limit stop is far from static contact protruding portion in opening state, torsion spring restores, and extension plate covers moving contact point.The transmission mechanism of circuit breaker drives moving contact to rotate.

[0009] Preferably, the moving contact and the static contact are both made of copper plated with nickel.

[0010] Preferably, the moving contact point and the static contact point are both attached with a silver plating layer, so as to have stronger conduction performance.

[0011] Preferably, the static contact convex part is attached with an insulating coating.

[0012] Preferably, the arc extinguishing wall plate and the arc extinguishing insulating plate are made of superhigh-temperature-resistant ceramic material.

[0013] Preferably, the dynamic contact rotating shaft, the arc extinguishing insulating plate shaft, the arc extinguishing wall plate shaft and the torsion spring are made of stainless steel.

[0014] Preferably, the dynamic contact is provided with a torsion spring mounting groove, one end of the torsion spring is fixed to the torsion spring mounting groove, and the other end is fixed to the arc extinguishing insulating plate.

[0015] Preferably, the static contact is provided with a static contact fixing hole.

[0016] A circuit breaker comprises a circuit breaker shell and a transmission mechanism, and further comprises the quick arc extinguishing device.

[0017] The utility model has the following technical effects:

[0018] 1. When the dynamic contact point and the static contact point are ready to contact, an arc will be generated between the dynamic contact point and the static contact point. When the dynamic contact point approaches the static contact point, the dynamic contact point is isolated by the arc extinguishing insulating plate. Only when the dynamic contact point is about to contact the static contact point, the limiting plate abuts against the static contact convex part, so that the arc extinguishing insulating plate is separated from the dynamic contact point, greatly reducing the generation of arc when the dynamic contact point and the static contact point close. When the dynamic contact point and the static contact point contact, the circuit is conducted, the limiting plate abuts against the static contact convex part, the torsion spring is extruded, and the extension plate is away from the dynamic contact point. At this time, the torsion spring extrusion accumulates energy. When the dynamic contact point and the static contact point are separated, the circuit is disconnected. At this time, an arc is generated. When the limiting plate is separated from the static contact convex part, the torsion spring quickly restores, drives the arc extinguishing insulating plate to rotate quickly, makes the extension plate quickly insert between the dynamic contact point and the static contact point, and makes the dynamic contact point and the static contact point high-speed cut off. The arc can be quickly extinguished when the arc is generated. The speed of arc from generation to extinguishment of the circuit breaker is effectively improved. The arc generation energy is reduced. The arc extinguishing capacity of the circuit breaker is effectively improved.

[0019] 2. By placing the dynamic contact point in the arc extinguishing wall plate, the possibility of generating arc from other surfaces is eliminated, the arc around the dynamic contact point is reduced, and the arc extinguishing is more convenient and fast.

[0020] 3. The arc extinguishing wall plate and the arc extinguishing insulating plate wrap around the dynamic contact convex part to form an arc extinguishing chamber, so as to eliminate the possibility of arc reignition after arc cutting, protect the dynamic contact point and the static contact point around from being eroded by electricity, and improve the service life of the circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 This is a schematic diagram of the closing of the rapid arc extinguishing device of this utility model;

[0022] Figure 2 This is a top view of the closing mechanism of the rapid arc extinguishing device of this utility model;

[0023] Figure 3 This is a schematic diagram of the circuit breaker tripping mechanism of the rapid arc extinguishing device of this utility model;

[0024] Figure 4 This is a schematic diagram of the assembly of the moving contact and the torsion spring of this utility model;

[0025] Figure 5 This is a schematic diagram of the arc-extinguishing wall panel of this utility model;

[0026] Figure 6 This is a schematic diagram of the circuit breaker housing of this utility model;

[0027] Figure 7 This is a schematic diagram of the circuit breaker of this utility model.

[0028] In the diagram: 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 mounting slot; 2. Stationary contact; 21. Stationary contact point; 22. Stationary contact protrusion; 23. Stationary contact fixing hole; 3. Arc-extinguishing insulation plate; 31. Extension plate; 32. Limiting plate; 4. Arc-extinguishing wall plate; 5. Torsion spring; 6. Circuit breaker housing; 7. Transmission mechanism. Detailed Implementation

[0029] To make the objectives, technical solutions and advantages of this utility model clearer, the following detailed description of this utility model is provided in conjunction with the accompanying drawings.

[0030] Example 1

[0031] like Figures 1 to 5 As shown, a rapid arc-extinguishing device, connected to the transmission mechanism 7 of a circuit breaker, includes a moving contact 1, a stationary contact 2, an arc-extinguishing insulating plate 3, and an arc-extinguishing wall plate 4. The moving contact 1 includes a moving contact 11, and the stationary contact 2 includes a stationary contact 21 and a stationary contact protrusion 22. A moving contact shaft 12 is fixedly mounted on the moving contact 1, and the moving contact shaft 12 is connected to the transmission mechanism 7 of the circuit breaker. The moving contact 11 contacts the stationary contact 21 to close or separate to open the circuit. An arc-extinguishing wall plate shaft 13 and an arc-extinguishing insulating plate shaft 14 are also mounted on the moving contact 1. Figure 5As shown, the arc-extinguishing wall plate 4 is a concave plate with a hollow bottom, which is installed on the arc-extinguishing wall plate shaft 13. The moving contact 11 is placed inside the arc-extinguishing wall plate 4, and its bottom surface is flush with the bottom surface of the arc-extinguishing wall plate 4. The arc-extinguishing insulating plate 3 is an arc-shaped concave plate that matches the end of the moving contact 1 and has an extension plate 31 on the side of its bottom edge near the moving contact 11. It is installed on the arc-extinguishing insulating plate shaft 14. A torsion spring 5 is installed on the arc-extinguishing insulating plate shaft 14. One end of the torsion spring 5 is fixed to the moving contact 1, and the other end is fixed to the arc-extinguishing insulating plate 3. The arc-extinguishing insulating plate 3 is also provided with a limiting plate 32. In the closed state, the limiting plate 32 abuts against the protrusion 22 of the stationary contact, the torsion spring 5 is squeezed, and the extension plate 31 moves away from the moving contact 11. In the open state, the limiting plate 32 moves away from the protrusion 22 of the stationary contact, the torsion spring 5 returns to its original state, and the extension plate 31 covers the moving contact 11.

[0032] The moving contact shaft 12 is connected to the transmission mechanism 7 of the circuit breaker, which drives the moving contact 1 to rotate.

[0033] like Figure 1 As shown, when the moving contact 11 is about to make contact with the stationary contact 21, an electric arc will be generated between them. As the moving contact 11 approaches the stationary contact 21, the arc-extinguishing insulating plate 3 isolates the moving contact 11. Only when the moving contact 11 is about to contact the stationary contact 21 does the limiting plate 32 abut against the protrusion of the stationary contact 21, separating the arc-extinguishing insulating plate 3 from the moving contact 11, greatly reducing the generation of an electric arc when the moving contact 11 and stationary contact 21 close. When the moving contact 11 makes contact with the stationary contact 21, the circuit is connected, the limiting plate 32 abuts against the protrusion 22 of the stationary contact, the torsion spring 5 compresses, and the extension plate 31 moves away from the moving contact 11. At this time, the torsion spring 5 accumulates energy during compression. Figure 3 As shown, when the moving contact 11 separates from the stationary contact 21, the circuit is opened, generating an electric arc. Upon separation, the limiting plate 32 disengages from the stationary contact protrusion 22, and the torsion spring 5 quickly returns to its original position, causing the arc-extinguishing insulating plate 3 to rotate rapidly. This allows the extension plate 31 to quickly insert between the moving contact 11 and the stationary contact 21, achieving high-speed isolation between them. This allows the arc to be extinguished quickly as it is generated, effectively increasing the speed at which the arc is generated and extinguished, reducing the energy generated by the arc, and effectively improving the arc-extinguishing capability of the circuit breaker. By placing the moving contact 11 within the arc-extinguishing wall plate 4, the possibility of arc generation from other surfaces is eliminated, reducing the likelihood of arc generation around the perimeter, thus making arc extinguishing faster and more convenient. The arc-extinguishing wall plate 4 and the arc-extinguishing insulating plate 3 enclose the moving contact 11 to form an arc-extinguishing chamber, eliminating the possibility of arc reignition after arc cutting, protecting the area around the moving and stationary contacts from electrolytic corrosion, and improving the service life of the circuit breaker.

[0034] Both the moving contact 1 and the stationary contact 2 are made of nickel-plated copper.

[0035] The moving contact 11 and the static contact 21 are attached with silver plating layers. This makes them have stronger conduction performance.

[0036] The static contact protruding part 22 is attached with an insulating coating. This ensures that the static contact protruding part 22 is insulated.

[0037] The arc extinguishing wall plate 4 and the arc extinguishing insulating plate 3 are made of superhigh-temperature-resistant ceramic material. This ensures that the arc extinguishing wall plate 4 and the arc extinguishing insulating plate 3 are insulated.

[0038] The moving contact rotating shaft 12, the arc extinguishing insulating plate shaft 14, the arc extinguishing wall plate shaft 13 and the torsion spring 5 are made of stainless steel.

[0039] As shown in Figure 3 , Figure 4 , the moving contact 1 is provided with a torsion spring 5 mounting groove 15. One end of the torsion spring 5 is fixed to the torsion spring 5 mounting groove 15, and the other end is fixed to the arc extinguishing insulating plate 3. This makes the torsion spring 5 more firmly installed in the moving contact 1.

[0040] As shown in Figure 2 , the static contact 2 is provided with a static contact fixing hole 23. This facilitates the fixation of the static contact 2.

[0041] An arc extinguishing method of a quick arc extinguishing device is as follows:

[0042] When the moving contact 11 and the static contact 21 are ready 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 3. Only when the moving contact 11 is about to contact the static contact 21, the limiting plate 32 abuts against the static contact protruding part 22, so that the arc extinguishing insulating plate 3 is separated from the moving contact 11, greatly reducing the generation of arc when the moving contact 11 and the static contact 21 close. When the moving contact 11 and the static contact 21 contact, the circuit is conducted, the limiting plate 32 abuts against the static contact protruding part 22, and the torsion spring 5 is pressed. At this time, the torsion spring 5 accumulates energy, and the extension plate 31 is away from the moving contact 11. When the moving contact 11 and the static contact 21 are separated, the circuit is disconnected, and an arc is generated at this time. When the moving contact 11 and the static contact 21 are separated, the limiting plate 32 is separated from the static contact protruding part 22. At this time, the torsion spring 5 is not limited by the limiting plate 32, and quickly restores, driving the arc extinguishing insulating plate 3 to quickly rotate, so that the extension plate 31 quickly inserts between the moving contact 11 and the static contact 21, and the moving contact 11 and the static contact 21 are quickly disconnected. In this way, with the energy of the torsion spring 5, the arc is quickly extinguished.

[0043] Example 2

[0044] As shown in Figure 6 , Figure 7As shown, a circuit breaker, the embodiment includes the fast arc extinguishing device in embodiment 1, further comprising a circuit breaker housing 6 and a transmission mechanism 7, the fast arc extinguishing device is installed in the circuit breaker housing 6, the transmission mechanism 7 is connected with the movable contact rotating shaft 12. Transmission mechanism 7 drives movable contact 1 to rotate. Through the fast arc extinguishing device, when the arc is generated, the arc can be quickly extinguished, effectively improving the speed of the circuit breaker arc from generation to extinction, reducing the arc generation energy, effectively improving the arc extinguishing ability of the circuit breaker.

[0045] The above-described embodiments are only used to describe the preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements of the technical scheme of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A rapid arc-extinguishing device, connected to the transmission mechanism of a circuit breaker, characterized in that, The circuit breaker includes a moving contact, a stationary contact, an arc-extinguishing insulating plate, and an arc-extinguishing wall plate. The moving contact includes a moving contact point, and the stationary contact includes a stationary contact point and a stationary contact protrusion. A moving contact shaft is fixedly mounted on the moving contact, and the moving contact shaft is connected to the transmission mechanism of the circuit breaker. The moving contact point contacts the stationary contact point to close or separate to open the circuit breaker. An arc-extinguishing wall plate shaft and an arc-extinguishing insulating plate shaft are also mounted on the moving contact. The arc-extinguishing wall plate is a concave plate with a hollowed-out bottom, mounted on the arc-extinguishing wall plate shaft. The moving contact point is placed inside the arc-extinguishing wall plate, and its bottom surface is flush with the arc-extinguishing wall plate. The bottom surface is flush; the arc-extinguishing insulating plate is an arc-shaped concave plate that matches the end of the moving contact and has an extension plate on the side of the bottom edge near the moving contact, and it 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 to the moving contact, and the other end is fixed to the arc-extinguishing insulating plate; the arc-extinguishing insulating plate is also provided with a limiting plate. In the closed state, the limiting plate abuts against the protrusion of the stationary contact, the torsion spring squeezes, and the extension plate moves away from the moving contact. In the open state, the limiting plate moves away from the protrusion of the stationary contact, the torsion spring returns to its original state, and the extension plate covers the moving contact.

2. The rapid arc-extinguishing device according to claim 1, characterized in that: Both the moving and stationary contacts are coated with a silver layer.

3. The rapid arc-extinguishing device according to claim 1, characterized in that: The raised portion of the stationary contact is coated with an insulating coating.

4. The rapid arc-extinguishing device according to claim 1, characterized in that: The moving contact is provided with a torsion spring mounting groove. One end of the torsion spring is fixed to the torsion spring mounting groove, and the other end is fixed to the arc-extinguishing insulation plate.

5. The rapid arc-extinguishing device according to claim 1, characterized in that: The stationary contact is provided with a stationary contact fixing hole.

6. A circuit breaker, comprising a circuit breaker housing and a transmission mechanism, characterized in that: It includes the rapid arc-extinguishing device according to any one of claims 1 to 5.

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