Arc cutting and extinguishing device of circuit breaker

Abstract

The utility model relates to an arc cutting and extinguishing device of a circuit breaker, which is installed in the circuit breaker and comprises a moving contact, a static contact and an arc cutting device, the arc cutting device comprises a fixing groove, a transmission piece, an extension spring and an arc cutting plate, and two side walls in the fixing groove are fixedly provided with a transmission piece fixing shaft and an arc cutting plate chute which correspond to each other; the transmission piece is provided with an extension spring fixing protruding part, an arc cutting plate limiting block, a moving contact matching hole and a transmission piece sliding groove. The transmission piece fixing shaft is installed in the transmission piece sliding groove. The arc cutting plate is installed in the arc cutting plate sliding groove. One end of the extension spring is fixed on the transmission part, and the other end of the extension spring is fixed on the arc cutting plate; one end, far away from the circuit breaker, of the moving contact is provided with a moving contact, the static contact is provided with a static contact, and the moving contact and the static contact are separated for opening or contacted for closing. According to the utility model, when the contact system is switched on and off, the moving contact moves to drive the arc cutting plate to rapidly cut and extinguish the arc generated between the moving contact and the static contact, thereby realizing high-efficiency arc extinguishing.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the circuit breaker equipment technical field, especially related to a cutting arc arc extinguishing device of circuit breaker. BACKGROUND

[0002] In the power system, the circuit breaker plays a crucial role in the power network with its unique performance and function. It is not only a switching device, but also a powerful tool that can close, carry and break the current under various conditions.

[0003] The core indicator of the circuit breaker is its ability to reliably complete the breaking task when facing short-circuit currents of 10 times the rated current or more. This is actually a test of its arc extinguishing ability. The level of arc extinguishing ability is directly related to the performance of the circuit breaker. When the arc extinguishing ability is strong, not only can it effectively cut off the current and protect the contacts from damage, but also can prolong the overall operation time of the device and ensure the stable operation of the power system.

[0004] In order to better solve the arc extinguishing problem, modern technology brings a fast arc cutting mode arc extinguishing device. This device has a unique response mechanism, which can quickly and accurately respond at the moment the arc is generated, and quickly cuts off and extinguishes the arc through specific technical means. The design concept of this device is advanced, not only pursuing fast arc extinguishing, but also focusing on the safety of equipment and personnel.

[0005] However, the existing fast arc cutting mode arc extinguishing device still has some shortcomings. First, although its response speed is extremely fast, in some cases, the arc extinguishing time is still slightly long. This may cause the arc to cause some harm to equipment and personnel. Second, the cost of the device is relatively high, which increases the operating cost of the power system to some extent.

[0006] The current arc extinguishing technology can suppress the arc to some extent, but still has many problems. For example, the arc cutting is not complete, which may reignite, and the arc runner has a short service life and slow arc movement speed. The improvement measures mainly focus on speeding up the arc entering the arc chamber and splitting, but they have not really reduced the energy of the arc. Most of the current circuit breakers use arc runners to divide the arc into several segments and rely on the cathode and anode voltage drop to extinguish the arc, but this way the runner is easy to damage and the arc speed is slow. In order to improve the arc extinguishing efficiency, an arc leading device needs to be added or more complex arc extinguishing technology needs to be used, resulting in a more complex device structure, larger size, and more trouble in use, which cannot ensure the efficient and safe operation of the power system. INVENTION CONTENTS

[0007] The technical problem to be solved by this utility model is to provide an arc-cutting and arc-extinguishing device for a circuit breaker. When the contact system opens and closes, the movement of the moving contact drives the arc-cutting plate to quickly cut and extinguish the electric arc generated between the moving contact and the stationary contact, thereby minimizing the damage of the electric arc to the circuit breaker and effectively improving the circuit breaker's breaking capacity and arc-extinguishing capacity.

[0008] This utility model provides an arc-cutting and extinguishing device for a circuit breaker, installed in the circuit breaker. It includes a moving contact and a stationary contact. One end of the moving contact is provided with a rotating shaft connected to the circuit breaker. The stationary contact is fixedly connected to the base of the circuit breaker. The circuit breaker's transmission mechanism drives the moving contact to move. It also includes an arc-cutting device, which includes a fixed groove, a transmission component, a tension spring, and an arc-cutting plate. Corresponding transmission component fixing shafts and arc-cutting plate sliding grooves are fixedly provided on both sides of the fixed groove. The transmission component includes a tension spring fixing protrusion, an arc-cutting plate limiting block, a moving contact mating hole, and a transmission component sliding groove. The arc-cutting plate limiting block is located at the bottom of the transmission component. The transmission component fixing shaft is installed on the transmission component... The arc-cutting plate is installed within the arc-cutting plate groove. One end of the tension spring is fixed to the transmission component, and the other end is fixed to the arc-cutting plate. The moving contact has a mating shaft and a moving contact at the end away from the circuit breaker, with the moving contact located below the mating shaft, which is installed within the moving contact's mating hole. The stationary contact has a stationary contact, and the moving contact separates from the stationary contact for opening or makes contact for closing. In the open state, the arc-cutting plate covers the stationary contact, and the moving contact is located above the arc-cutting plate with a gap between it and the plate. In the closed state, the arc-cutting plate moves away from the stationary contact, and the arc-cutting plate limiting block abuts against the end of the arc-cutting plate away from the stationary contact, while the moving contact contacts the stationary contact. The transmission component's fixed shaft mates with the transmission component's groove to limit the relative position of the transmission component and the fixed groove. The arc-cutting plate groove mates with the arc-cutting plate, allowing the arc-cutting plate to move along the groove.

[0009] Preferably, the arc-cutting plate groove is sloping, with the end near the stationary contact lower than the end away from the stationary contact. Because the arc-cutting plate groove is sloping, the arc-cutting plate experiences increased gravity as it approaches the stationary contact during the opening and closing of the circuit, allowing it to insert more quickly between the moving and stationary contacts and cut the arc more rapidly.

[0010] Preferably, the transmission component has a tension spring fixing protrusion at the end away from the moving contact, and the arc-cutting plate has a tension spring fixing block at the end away from the stationary contact. One end of the tension spring is fixed on the tension spring fixing protrusion, and the other end is fixed on the tension spring fixing block.

[0011] Preferably, the fixing groove is U-shaped.

[0012] Preferably, the movable contact is made of copper-plated nickel material, the movable contact is provided with a high-temperature-resistant insulating coating around the movable contact, and the movable contact is provided with an insulating protective sleeve.

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

[0014] Preferably, the arc cutting plate is made of super-high-temperature ceramic material.

[0015] Preferably, the transmission member is made of thermosetting material.

[0016] Preferably, the matching shaft and the rotating shaft are made of stainless steel material.

[0017] Preferably, the tension spring is made of spring steel or stainless steel material.

[0018] The utility model has the following technical effects:

[0019] 1. By adopting the cooperation of the tension spring, the transmission member and the arc cutting plate, the transmission member sliding groove of the transmission member driven by the movable contact moves along the transmission member fixing shaft, the tension spring is stretched and contracted along with the position change of the transmission member, thereby driving the arc cutting plate to move, and quick arc cutting and arc extinguishing are realized.

[0020] 2. When the movable contact and the static contact are closed, the circuit breaker transmission mechanism rotates with the movable contact, the movable contact approaches the static contact, and the tension spring is gradually compressed from the elongated state. When the movable contact contacts the static contact, the tension spring is quickly restored and elongated from the compressed state, the arc cutting plate moves, the arc cutting plate is separated from the static contact, the movable contact and the static contact are completely contacted, and the closing action of the arc extinguishing device is completed.

[0021] When the movable contact and the static contact are opened, the movable contact and the static contact are separated, a voltage drop is formed, an arc is generated, the tension spring is compressed, the arc cutting plate is quickly inserted between the movable contact and the static contact under the action of the thrust of the tension spring and the limitation of the arc cutting plate sliding groove, the arc is quickly cut off, the generation of the arc is reduced from the source, the arc is quickly extinguished, and the harm of the arc to the circuit breaker is reduced.

[0022] 3. The arc cutting plate sliding groove is in the shape of a slope with the end close to the static contact lower than the end away from the static contact, when the movable contact and the static contact are opened, the arc cutting plate increases the action of its own gravity in the process of approaching the static contact, can be more quickly inserted between the movable contact and the static contact, and can cut off the arc more quickly. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a closing (omitting the fixed groove part) structure schematic view of the utility model arc extinguishing device.

[0024] Figure 2The utility model arc extinguishing device fixed groove structure schematic diagram;

[0025] Figure 3 The utility model arc extinguishing device fixed groove structure schematic diagram;

[0026] Figure 4 The utility model arc extinguishing device fixed groove structure schematic diagram;

[0027] Figure 5 The utility model arc extinguishing device fixed groove structure schematic diagram;

[0028] Figure 6 The utility model arc extinguishing device fixed groove structure schematic diagram;

[0029] Figure 7 The utility model arc extinguishing device fixed groove structure schematic diagram;

[0030] Figure 8 The utility model arc extinguishing device fixed groove structure schematic diagram;

[0031] Figure 9 The utility model arc extinguishing device fixed groove structure schematic diagram.

[0032] In the drawing: 1, circuit breaker;2, fixed groove;21, transmission part fixed shaft;22, arc cutting plate sliding groove;3, movable contact;31, movable contact point;4, static contact;41, static contact point;5, transmission part;51, stretch spring fixed protruding portion;52, arc cutting plate limiting block;53, movable contact cooperation hole;54, transmission part sliding groove;6, stretch spring;7, arc cutting plate;71, stretch spring fixed block;8, rotating shaft;9, cooperation shaft;10, base. Specific implementation

[0033] In order to make the utility model purposes, technical scheme and advantages more clearly, the following specific elaboration of the utility model is combined with the drawings.

[0034] As Figures 1 to 9As shown, an arc-cutting and extinguishing device for a circuit breaker is installed in the circuit breaker 1. It includes a moving contact 3 and a stationary contact 4. One end of the moving contact 3 is provided with a rotating shaft 8 connected to the circuit breaker 1. The stationary contact 4 is fixedly connected to the base 10 of the circuit breaker 1. The transmission mechanism of the circuit breaker 1 drives the moving contact 3 to move. It also includes an arc-cutting device, which includes a fixed groove 2, a transmission component 5, a tension spring 6, and an arc-cutting plate 7. Corresponding transmission component fixing shafts 21 and arc-cutting plate sliding grooves 22 are fixedly provided on both sides of the fixed groove 2. The transmission component 5 is provided with a tension spring fixing protrusion 51, an arc-cutting plate limiting block 52, a moving contact mating hole 53, and a transmission component sliding groove 54. The arc-cutting plate limiting block 52 is located at the bottom of the transmission component 5, and the transmission component fixing shaft 21 is installed in the transmission component sliding groove 54. The arc-cutting plate 7 is installed in the arc-cutting plate groove 22; one end of the tension spring 6 is fixed to the transmission component 5, and the other end is fixed to the arc-cutting plate 7; the moving contact 3 is provided with a mating shaft 9 and a moving contact 31 at the end away from the circuit breaker 1, the moving contact 31 is located below the mating shaft 9, and the mating shaft 9 is installed in the moving contact mating hole 53; the stationary contact 4 is provided with a stationary contact 41, and the moving contact 31 is separated from the stationary contact 41 for opening or made into contact for closing; in the opening state, the arc-cutting plate 7 covers the stationary contact 41, the moving contact 31 is located above the arc-cutting plate 7, and there is a gap between the moving contact 31 and the arc-cutting plate 7; in the closing state, the arc-cutting plate 7 is away from the stationary contact 41, the arc-cutting plate limiting block 52 abuts against the end of the arc-cutting plate 7 away from the stationary contact 41, and the moving contact 31 is in contact with the stationary contact 41. The fixed shaft 21 of the transmission component cooperates with the sliding groove 54 of the transmission component to limit the relative position of the transmission component 5 and the fixed groove 2; the sliding groove 22 of the arc cutting plate cooperates with the arc cutting plate 7 to make the arc cutting plate 7 move along the sliding groove 22 of the arc cutting plate.

[0035] like Figure 7 As shown, the arc-cutting plate groove 22 is sloping, with the end near the stationary contact 41 lower than the end away from the stationary contact 41. Because the arc-cutting plate groove 22 is sloping, with the end near the stationary contact 41 lower than the end away from the stationary contact 41, when the moving contact 3 and the stationary contact 4 are disconnected, the arc-cutting plate 7 experiences increased gravity as it approaches the stationary contact 41, allowing it to insert more quickly between the moving contact 31 and the stationary contact 41, and thus cut the arc more quickly.

[0036] By using a tension spring 6 in conjunction with the transmission component 5 and the arc-cutting plate 7, the moving contact 3 drives the transmission component slide 54 of the transmission component 5 to move along the fixed shaft 21 of the transmission component. The tension spring 6 will extend and retract as the position of the transmission component 5 changes, thereby driving the arc-cutting plate 7 to move, thus achieving rapid arc cutting and extinguishing.

[0037] When the moving contact 3 and the static contact 4 are closed, the transmission mechanism of the circuit breaker 1 rotates with the moving contact 3, so that the moving contact 31 approaches the static contact 41, and the tension spring 6 is gradually compressed from the elongated state.

[0038] When the moving contact 3 and the static contact 4 are opened, the moving contact 31 and the static contact 41 are separated, a voltage drop is formed, an arc is generated, the tension spring 6 is compressed, the arc plate 7 is quickly inserted between the moving contact 31 and the static contact 41 under the restriction of the arc plate sliding groove 22 and the thrust of the tension spring 6, the arc is quickly cut off, the generation of the arc is reduced from the source, the arc is quickly extinguished, and the harm of the arc to the circuit breaker 1 is reduced.

[0039] As shown in Figure 6 , the transmission member 5 is provided with a tension spring fixing protrusion 51 at the end away from the moving contact 3, the arc plate 7 is provided with a tension spring fixing block 71 at the end away from the static contact 41, and one end of the tension spring 6 is fixed on the tension spring fixing protrusion 51 and the other end is fixed on the tension spring fixing block 71.

[0040] As shown in Figure 4 , Figure 5 , the fixed groove 2 is in the shape of a U-shaped groove.

[0041] The moving contact 3 is made of copper plated nickel material, the moving contact 31 is provided with a high-temperature-resistant insulating coating, and the moving contact 3 is provided with an insulating protective sleeve.

[0042] The static contact 41 is made of copper plated nickel material, the static contact 41 is provided with a high-temperature-resistant insulating coating, and the static contact 4 is provided with an insulating protective sleeve.

[0043] The arc plate 7 is made of super-high-temperature ceramic material.

[0044] The transmission member 5 is made of thermosetting material.

[0045] The cooperating shaft 9 and the rotating shaft 8 are made of stainless steel material.

[0046] The tension spring 6 is made of spring steel or stainless steel material.

[0047] 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, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A cutting arc extinguishing device of a circuit breaker, which is installed in a circuit breaker and comprises a moving contact and a stationary contact, one end of the moving contact is provided with a rotating shaft connected with the circuit breaker, the stationary contact is fixedly connected with a base of the circuit breaker, and a transmission mechanism of the circuit breaker drives the moving contact to move, characterized in that, It also includes arc cutting device, the arc cutting device includes fixed slot, transmission part, tension spring and arc cutting plate, both sides of the fixed slot are fixed with corresponding transmission part fixed shaft and arc cutting plate sliding groove; The transmission part is provided with a tension spring fixed protruding portion, an arc cutting plate limiting block, a movable contact matching hole, a transmission part sliding groove, the arc cutting plate limiting block is located at the bottom of the transmission part, and the transmission part fixed shaft is installed in the transmission part sliding groove; The arc cutting plate is installed in the arc cutting plate sliding groove; One end of the tension spring is fixed on the transmission part, and the other end is fixed on the arc cutting plate; The movable contact is provided with a matching shaft and a movable contact point away from the circuit breaker, the movable contact point is located below the matching shaft, and the matching shaft is installed in the movable contact matching hole; The static contact is provided with a static contact point, and the movable contact point and the static contact point are separated to open or contact to close; In the open state, the arc cutting plate covers the static contact point, the movable contact point is located above the arc cutting plate, and there is a spacing between the movable contact point and the arc cutting plate; In the closed state, the arc cutting plate is away from the static contact point, the arc cutting plate limiting block is in contact with the end of the arc cutting plate away from the static contact point, and the movable contact point is in contact with the static contact point.

2. An arc chopping and extinguishing device for a circuit breaker according to claim 1, characterized in that: The arc cutting plate sliding groove is in the shape of a slope, which is lower at the end close to the static contact point than at the end away from the static contact point.

3. The arc chopping and extinguishing device of claim 1, wherein: The transmission part is provided with a tension spring fixed protruding portion away from the movable contact, and the arc cutting plate is provided with a tension spring fixed block away from the static contact point, one end of the tension spring is fixed on the tension spring fixed protruding portion, and the other end is fixed on the tension spring fixed block.

4. The arc chopping and extinguishing device of claim 1 wherein: The fixed slot is in the shape of a U-shaped groove.

5. The arc chopping and extinguishing device of claim 1 wherein: The movable contact is provided with an insulating protective sleeve.

6. The arc chopping and extinguishing device of claim 1, wherein: The static contact is provided with an insulating protective sleeve.

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