Instantaneous protection mechanism and circuit breaker

Abstract

The embodiment of the utility model provides an instantaneous protection mechanism and a circuit breaker, and relates to the technical field of electrical switches. An instantaneous protection mechanism comprises a release assembly and an arc striking angle. The release assembly is used for actuating when the current is abnormal so as to drive a moving contact and a static contact of the circuit breaker to be separated; the arc striking angle is connected to the release assembly and comprises a base material and a plating layer arranged on the base material, and the resistivity of the base material is larger than that of the plating layer. According to the structure of the instantaneous protection mechanism, the protection function of the instantaneous protection mechanism on the circuit where the circuit breaker is located is guaranteed, meanwhile, the structure of the circuit breaker is simplified, and the arc striking and arc extinguishing effects of the circuit breaker are improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electrical switches, and in particular to an instantaneous protection mechanism and a circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under normal circuit conditions and can close, carry and interrupt current under abnormal circuit conditions within a specified time.

[0003] An instantaneous protection mechanism is generally provided in the circuit breaker, and the instantaneous protection mechanism is used to drive the moving contact of the circuit breaker to perform the above-mentioned circuit breaking action.

[0004] Conventional instantaneous protection mechanisms are generally also provided with an arc striking angle. The instantaneous protection mechanism is installed on one side of the arc extinguishing chamber. The arc striking angle plays a role in directing the arc into the arc extinguishing chamber, but the arc striking and arc extinguishing effects are often not ideal. Utility Model Content

[0005] In view of the above problems, an embodiment of the present application provides an instantaneous protection mechanism and a circuit breaker, which structure improves the arc striking and arc extinguishing effects of the circuit breaker while ensuring the protection function of the instantaneous protection mechanism on the circuit where the circuit breaker is located.

[0006] According to one aspect of an embodiment of the present application, an instantaneous protection mechanism is provided, including a release assembly and an arc striking angle; the release assembly is used to actuate when the current is abnormal to drive the moving contact and the static contact of the circuit breaker to separate; the arc striking angle is connected to the release assembly, and the arc striking angle includes a substrate and a coating provided on the substrate, and the resistivity of the substrate is greater than the resistivity of the coating.

[0007] By adopting the above scheme, the release assembly can drive the moving contact and the static contact of the circuit breaker to separate when braking, so as to realize the circuit breaker tripping to protect the circuit. The arc striking angle is connected to the release assembly. By assembling the release assembly, the arc striking angle can be assembled, which simplifies the structure of the circuit breaker. The resistivity of the substrate is greater than the resistivity of the coating. Since the resistivity of the substrate is large, when the arc passes through the arc striking angle, the resistance of the circuit where the arc is located can be increased, which plays a current limiting role and is conducive to achieving rapid arc extinguishing. The resistivity of the coating is small, which is conducive to achieving rapid arc striking at the beginning of the arc generation. In short, the above structure simplifies the structure of the circuit breaker and improves the arc striking and arc extinguishing effects of the circuit breaker while ensuring the protection function of the instantaneous protection mechanism to the circuit where the circuit breaker is located.

[0008] In some embodiments, the substrate is iron and the plating layer is copper or nickel.

[0009] By adopting the above scheme, iron is a conductive metal with low cost and high resistance that is easy to obtain, and copper and nickel are conductive metals with low resistance that are easy to obtain. The cost of the arc starting angle adopting this structure is low.

[0010] In some embodiments, the release assembly includes a yoke, an armature, a terminal block and an elastic member; the terminal block is at least partially in contact with the yoke; the armature is rotatably arranged relative to the yoke, and the yoke is at least partially located within the rotation area of ​​the armature; the elastic member cooperates with the armature to drive the armature away from the yoke; when the current of the terminal block increases abnormally, the yoke attracts the armature to rotate, so that the release assembly is actuated.

[0011] By adopting the above scheme, since the terminal board is at least partially in contact with the yoke, when the current of the terminal board is abnormal, the yoke is magnetized, and the magnetic field around it increases instantaneously, thereby attracting the armature to rotate in the direction close to the yoke. The rotation of the armature can drive the moving contact and the static contact to separate. After the moving contact and the static contact are separated, the current of the terminal board decreases, and the suction force of the yoke on the armature decreases. The armature rotates in the direction away from the yoke under the action of the elastic member. The release assembly in the present application adopts a snap-on structure. Compared with the solenoid structure in the related art, the release assembly of the present application has fewer parts and lower material costs; the number of welding points between parts is reduced, the production process of the release assembly is simpler, the resistance of the circuit breaker is reduced, and the power loss of the circuit breaker is reduced.

[0012] In some embodiments, one end of the terminal block is bent to form a stationary contact, and the arc starting horn is connected to the stationary contact.

[0013] By adopting the above solution, the terminal board and the static contact are integrated, so that the number of parts is reduced and the manufacturing process of the instantaneous protection mechanism is simpler. The arc striking angle is connected to the static contact, which is convenient for directly guiding the arc on the static contact to the arc extinguishing chamber, thereby improving the arc striking effect of the arc striking angle.

[0014] In some embodiments, the yoke includes a bottom wall and two side walls arranged on both sides of the bottom wall, the end of the side wall away from the bottom wall is used to attract the armature, and the bottom wall is used to be close to the arc extinguishing chamber of the circuit breaker; the terminal block includes a first section and a second section parallel to the bottom wall, the first section is closer to the static contact than the second section, the first section is in contact with the bottom wall, and there is a gap between the second section and the bottom wall so that the current on the bottom wall opposite to the second section is directed toward the static contact.

[0015] By adopting the above scheme, when the arc enters the arc extinguishing chamber, it generally enters from the side where the moving contact and the static contact are located. After the arc enters the arc extinguishing chamber, the bottom wall of the yoke is charged and generates a magnetic field. The flow direction of the current on the bottom wall of the yoke is: from the bottom wall opposite to the second section to the static contact, after flowing to the position where the bottom wall contacts the first section, it flows along the second section in the direction away from the static contact. At this time, the magnetic blowing direction generated by the magnetic field on the bottom wall in the arc extinguishing chamber area is the direction away from the static contact. Generally, the air outlet of the arc extinguishing chamber is set in this direction, so the magnetic blowing force in this direction can accelerate the arc to enter the arc extinguishing chamber, and accelerate the airflow to flow out of the air outlet of the arc extinguishing chamber after the arc is extinguished.

[0016] In some embodiments, the gap is greater than or equal to 1 mm.

[0017] By adopting the above scheme, a short circuit between the bottom wall and the second section of the terminal block can be prevented, and the current on the bottom wall can be prevented from flowing away from the static contact, thereby ensuring that the direction of the magnetic blowing force is toward the outlet of the arc extinguishing chamber.

[0018] In some embodiments, the elastic member includes a plurality of torsion springs, each torsion spring includes a torsion spring coil, a first leg facing a first direction, and a second leg facing a second direction; the release assembly also includes a torsion spring shaft and a limit member, the torsion spring coil is sleeved on the torsion spring shaft, the first leg abuts against the armature, and the second leg abuts against the limit member; the first direction and the second direction have an angle.

[0019] By adopting the above solution, the first leg of the torsion spring is against the armature, and the second leg is against the limiter, so that the elastic force of the torsion spring can act on the armature and the limiter. When the limiter is fixed and the armature is rotatably connected, the torsion spring can make the armature have a tendency to rotate in a direction away from the yoke, so that the release assembly remains in a non-actuated state. The provision of multiple torsion springs allows the armature to be supported by multiple torsion springs, avoiding the problem of the armature tilting due to a single torsion spring supporting the armature, thereby making the armature more reliably attracted by the yoke, so that the circuit breaker can be tripped in time under abnormal conditions, achieving the effect of timely protecting the circuit.

[0020] In some embodiments, the second legs of two adjacent torsion springs are close to each other and connected, or the second legs of two adjacent torsion springs are far away from each other and connected.

[0021] By adopting the above solution, a plurality of torsion springs can be bent by the same metal wire to form an integral multi-layer structure, thereby facilitating assembly.

[0022] In some embodiments, the limiting member includes a plurality of limiting gears, and when the second leg abuts against different limiting gears, the abutment tightness between the first leg and the armature is different.

[0023] By abutting the second leg against different limit gears, the abutment tightness between the first leg and the armature is changed, thereby changing the force when the yoke attracts the armature, so as to achieve the purpose of adapting to different abnormal currents of the circuit breaker, so that the instantaneous protection mechanism can be used for circuit breakers with different protection requirements.

[0024] According to another aspect of an embodiment of the present application, a circuit breaker is provided, comprising a housing, an arc extinguishing chamber and an instantaneous protection mechanism of any of the above embodiments, wherein an arc striking angle of the instantaneous protection mechanism is located on an air inlet side of the arc extinguishing chamber.

[0025] The embodiment of the present application connects an arc striking angle to the release assembly, and the resistance of the base material of the arc striking angle is greater than the resistance of the coating, thereby simplifying the structure of the circuit breaker while ensuring the protection function of the instantaneous protection mechanism for the circuit where the circuit breaker is located, thereby improving the arc striking and arc extinguishing effects of the circuit breaker.

[0026] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 Schematic diagram of the overall structure of the instantaneous protection mechanism in one embodiment of the present application.

[0029] Figure 2 It is a schematic cross-sectional structural diagram of the instantaneous protection mechanism in one embodiment of the present application.

[0030] Figure 3 Schematic diagram of the structure of an elastic member according to an embodiment of the present application.

[0031] Figure 4 It is a cross-sectional view of a circuit breaker according to an embodiment of the present application.

[0032] Explanation of the reference numerals: 1000, instantaneous protection mechanism; 100, release assembly; 110, yoke; 111, bottom wall; 112, side wall; 120, armature; 130, terminal block; 131, first section; 132, second section; 140, elastic member; 141, torsion spring; 1411, first leg; 1412, second leg; 1413, torsion spring coil; 150, static contact; 160, torsion spring shaft; 170, limit member; 171, limit gear; 200, arcing angle; 2000, housing; 3000, arc extinguishing chamber. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0035] The terms "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover but not exclude other contents. The word "a" or "an" does not exclude the presence of a plurality.

[0036] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the instantaneous protection mechanism or circuit breaker of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0040] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0041] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a fixing member, such as a fixed connection through a screw, bolt or other fixing member; the physical connection may also be a detachable connection, such as a mutual snap connection or snap connection; the physical connection may also be an integral connection, such as welding, bonding or integral molding to form a connection for connection. The "connection" or "connection" of a circuit structure may refer to an electrical connection or a signal connection in addition to a physical connection. For example, it may be a direct connection, that is, a physical connection, or it may be an indirect connection through at least one intermediate element, as long as the circuit is connected, or it may be the internal connection of two elements; the signal connection may refer to a signal connection through a media medium, such as a radio wave, in addition to a signal connection through a circuit. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The circuit breaker is generally provided with an instantaneous protection mechanism, which is used to drive the moving contact of the circuit breaker to perform the above-mentioned circuit breaking action. Conventional instantaneous protection mechanisms are generally also provided with an arc striking angle, which is installed on one side of the arc extinguishing chamber. The arc striking angle plays the role of leading the arc into the arc extinguishing chamber, but the arc striking and arc extinguishing effects are often not ideal.

[0043] The inventor improved the arc striking angle by changing the material of the arc striking angle to a material with a higher resistivity, attempting to achieve the purpose of rapid arc extinguishing by increasing the resistance of the arc striking angle. However, this will affect the efficiency of the arc striking angle in directing the arc into the arc extinguishing chamber, resulting in incomplete arc entry into the arc extinguishing chamber.

[0044] If the material of the arc striking angle is changed to a material with a lower resistivity, an attempt is made to improve the arc striking efficiency of the arc striking angle by reducing the resistance of the arc striking angle and reduce the arc movement in the circuit breaker. However, this will make it difficult to extinguish the arc entering the arc extinguishing chamber, causing certain damage to the components outside the exhaust port of the arc extinguishing chamber.

[0045] In view of the above problems, an embodiment of the present application provides an instantaneous protection mechanism and a circuit breaker, which structure improves the arc striking and arc extinguishing effects of the circuit breaker while ensuring the protection function of the instantaneous protection mechanism on the circuit where the circuit breaker is located.

[0046] like Figure 1 As shown, an instantaneous protection mechanism 1000 provided in the present application includes a release assembly 100 and an arc-starting angle 200; the release assembly 100 is used to actuate when the current is abnormal to drive the moving contact of the circuit breaker to separate from the static contact 150; the arc-starting angle 200 is connected to the release assembly 100, and the arc-starting angle 200 includes a substrate and a coating provided on the substrate, and the resistivity of the substrate is greater than the resistivity of the coating.

[0047] Exemplarily, in some embodiments, the substrate is iron, and the plating layer is copper or nickel.

[0048] Iron is a conductive metal with a relatively high resistivity and low cost and is easily available, and copper and nickel are conductive metals with relatively low resistivity and are easily available. The cost of the arc starting angle 200 with this structure is relatively low.

[0049] The resistivity of the substrate is greater than that of the coating. Due to the large resistivity of the substrate, when the arc passes through the arc striking angle 200, the resistance of the arc circuit can be increased, which plays a current limiting role and is conducive to rapid arc extinguishing. The resistivity of the coating is small, which is conducive to rapid arc striking at the beginning of the arc.

[0050] The arc striking angle 200 is connected to the release assembly 100. When assembling the circuit breaker, the release assembly 100 is assembled in the housing 2000 of the circuit breaker, so that the arc striking angle 200 can be assembled, which simplifies the structure of the circuit breaker.

[0051] When the trip assembly 100 is braked, it can drive the moving contact of the circuit breaker to separate from the static contact 150, thereby achieving the circuit breaker tripping to protect the circuit. The trip assembly 100 can adopt a solenoid structure or a snap-on structure, which is not limited in this embodiment of the present application.

[0052] It can be seen that the instantaneous protection mechanism 1000 of the above structure simplifies the structure of the circuit breaker and improves the arc striking and arc extinguishing effects of the circuit breaker while ensuring the protection function of the circuit where the circuit breaker is located.

[0053] like Figure 1 and Figure 2As shown, in some embodiments, the release assembly 100 includes a yoke 110, an armature 120, a terminal block 130 and an elastic member 140; the terminal block 130 is at least partially in contact with the yoke 110; the armature 120 is rotatably arranged relative to the yoke 110, and the yoke 110 is at least partially located in the rotation area of ​​the armature 120; the elastic member 140 cooperates with the armature 120 to drive the armature 120 away from the yoke 110; when the current of the terminal block 130 increases abnormally, the yoke 110 attracts the armature 120 to rotate, so that the release assembly 100 is actuated.

[0054] The terminal block 130 is used to be electrically connected to the terminal block of the circuit breaker in the circuit breaker, so that when the circuit breaker is connected to the circuit, the current of the main circuit of the circuit breaker flows through the circuit breaker along the terminal block 130. The terminal block 130 can be a plate-shaped structure made of copper. Copper has a small resistance, which can reduce the energy consumption of the circuit breaker and alleviate the heating inside the circuit breaker.

[0055] Since the terminal block 130 is at least partially in contact with the yoke 110, the yoke is easily magnetized by the terminal block 130 to generate a magnetic field. When the current of the terminal block 130 is abnormal, the magnetic field around the yoke 110 increases instantaneously, thereby attracting the armature 120 to overcome the elastic force of the elastic member 140 and rotate in a direction close to the yoke 110. The rotation of the armature 120 can drive the moving contact and the stationary contact 150 to separate. After the moving contact and the stationary contact 150 are separated, the current of the terminal block 130 decreases, and the suction force of the yoke 110 on the armature 120 decreases. The armature 120 rotates in a direction away from the yoke 110 under the action of the elastic member 140.

[0056] The release assembly 100 in the present application adopts a snap-on structure. Compared with the solenoid structure in the related art, the release assembly 100 in the present application has fewer parts and lower material costs; the number of welds between the parts is reduced, the production process of the release assembly 100 is simpler, the resistance of the circuit breaker is reduced, and the power loss of the circuit breaker is reduced.

[0057] like Figure 1 and Figure 2 As shown, in some embodiments, one end of the terminal block 130 is bent to form a stationary contact 150 , and the arc striking horn 200 is connected to the stationary contact 150 .

[0058] The terminal block 130 and the stationary contact 150 are integrated, so that the number of parts is reduced and the manufacturing process of the instantaneous protection mechanism 1000 is simpler.

[0059] The arc striking angle 200 can be connected to the moving contact by welding.

[0060] When the circuit breaker is closed, the static contact 150 contacts the moving contact, and when the circuit breaker is opened, the static contact 150 separates from the moving contact. When separated, the two ends of the arc are respectively located on the static contact 150 and the moving contact. Connecting the arc striking angle 200 to the static contact 150 facilitates guiding the arc on the static contact 150 directly to the arc extinguishing chamber 3000, thereby improving the arc striking effect of the arc striking angle 200.

[0061] Please continue to refer to Figure 1 and Figure 2 In some embodiments, the yoke 110 includes a bottom wall 111 and two side walls 112 arranged on both sides of the bottom wall 111, the end of the side wall 112 away from the bottom wall 111 is used to attract the armature 120, and the bottom wall 111 is used to approach the arc extinguishing chamber 3000 of the circuit breaker; the terminal block 130 includes a first section 131 and a second section 132 parallel to the bottom wall 111, the first section 131 is closer to the static contact 150 than the second section 132, the first section 131 is in contact with the bottom wall 111, and there is a gap a between the second section 132 and the bottom wall 111, so that the current on the bottom wall 111 opposite to the second section 132 is directed toward the static contact 150.

[0062] The first section 131 is in contact with the bottom wall 111 , which is beneficial to magnetizing the yoke 110 and achieving attraction between the yoke 110 and the armature 120 .

[0063] When the circuit breaker is tripped, the current is disconnected between the moving contact and the stationary contact 150, and the current on the side where the stationary contact 150 is located eventually flows along the terminal block 130 toward the end away from the stationary contact 150. If the bottom wall 111 is in contact with the terminal block 130 as a whole, the current flows on the bottom wall 111 in a direction away from the stationary contact 150.

[0064] In the present application, by providing a gap a between the second section 132 and the bottom wall 111, the current on the bottom wall 111 opposite to the second section 132 first flows toward the bottom wall 111 connected to the first section 131 (i.e., flows toward the static contact 150), and then flows along the first section 131 of the terminal block 130 to the second section 132 (i.e., flows toward a direction away from the static contact 150). At this time, the magnetic blowing direction generated by the magnetic field on the bottom wall 111 in the arc extinguishing chamber 3000 region is a direction away from the static contact 150, and the air outlet of the arc extinguishing chamber 3000 is generally arranged in this direction, so the magnetic blowing force in this direction can accelerate the arc to enter the arc extinguishing chamber 3000, and accelerate the airflow to flow out of the air outlet of the arc extinguishing chamber 3000 after the arc is extinguished.

[0065] In some embodiments, the gap a between the second segment 132 and the bottom wall 111 is greater than or equal to 1 mm.

[0066] By adopting the above scheme, a short circuit between the bottom wall 111 and the second section 132 of the terminal block 130 can be prevented, and the current on the bottom wall 111 can be prevented from flowing away from the static contact 150, thereby ensuring that the direction of the magnetic blowing force is toward the outlet of the arc extinguishing chamber 3000.

[0067] The elastic member 140 may be a cylindrical spring or a torsion spring 141 .

[0068] When the elastic member 140 is a cylindrical spring, the elastic member 140 can be connected to the side of the armature 120 away from the yoke 110 in a stretched state, and the elastic member 140 can also be in a compressed state against the side of the armature 120 close to the yoke 110, which is not limited in the embodiment of the present application.

[0069] When the elastic member 140 is a torsion spring 141 , the torsion spring 141 can be rotatably connected to the armature 120 on the same axis. When one leg of the torsion spring 141 is fixed, the other leg can contact the armature 120 to drive the armature 120 to move away from the yoke 110 .

[0070] like Figure 2 and Figure 3 As shown, in some embodiments, the elastic member 140 includes a plurality of torsion springs 141, each torsion spring 141 includes a torsion spring 141 roll, a first leg 1411 facing the first direction, and a second leg 1412 facing the second direction; the release assembly 100 also includes a torsion spring 141 shaft and a limit member 170, the torsion spring 141 roll is sleeved on the torsion spring 141 shaft, the first leg 1411 abuts against the armature 120, and the second leg 1412 abuts against the limit member 170; the first direction and the second direction have an angle.

[0071] By adopting the above solution, the first leg 1411 of the torsion spring 141 abuts against the armature 120, and the second leg 1412 abuts against the stopper 170, so that the elastic force of the torsion spring 141 can act on the armature 120 and the stopper 170. When the stopper 170 is fixed and the armature 120 is rotatably connected, the torsion spring 141 can make the armature 120 have a tendency to rotate in a direction away from the yoke 110, so that the release assembly 100 remains in a non-actuated state. The provision of multiple torsion springs 141 allows the armature 120 to be supported by multiple torsion springs 141, reducing the problem of the armature 120 tilting due to a single torsion spring 141 supporting the armature 120, thereby making the armature 120 more reliably attracted by the yoke 110, so that the circuit breaker can be tripped in time under abnormal conditions, achieving the effect of timely protecting the circuit.

[0072] Optionally, the number of torsion springs 141 can be an even number. In this way, the number of first legs 1411 is also an even number. When multiple first legs 1411 are against the armature 120, the force on both sides of the armature 120 is more even, and the probability of the armature 120 tilting is reduced to a greater extent.

[0073] For example, the elastic member 140 may include two torsion springs 141 , the torsion spring coils 141 of the two torsion springs 141 are coaxially arranged, the first legs of the two torsion springs 141 are oriented in substantially the same direction, and the second legs of the two torsion springs 141 are oriented in substantially the same direction.

[0074] In some embodiments, the second legs 1412 of two adjacent torsion springs 141 are close to each other and connected, or the second legs 1412 of two adjacent torsion springs 141 are far away from each other and connected.

[0075] When the elastic member 140 includes two torsion springs 141 , the second legs 1412 of the two torsion springs 141 are close to and connected to each other, or the second legs 1412 of the two torsion springs 141 are far away from and connected to each other.

[0076] The two second legs 1412 may be connected directly or indirectly. A direct connection may be that the two second legs 1412 are in contact with each other and are welded together. An indirect connection may be that the two second legs 1412 are connected via another medium.

[0077] Optionally, the plurality of torsion springs 141 may be bent by the same metal wire, so that the second legs 1412 of the plurality of torsion springs 141 are connected, and the plurality of torsion springs 141 may also form an integral multi-layer structure, thereby facilitating assembly.

[0078] like Figure 2 As shown, in some embodiments, the limiting member 170 includes a plurality of limiting stops 171 , and when the second leg 1412 abuts against different limiting stops 171 , the abutment tightness between the first leg 1411 and the armature 120 is different.

[0079] Exemplarily, the limiting member 170 includes a vertical rod and a plurality of cross rods connected to the vertical rod, and the plurality of cross rods are configured as a plurality of limiting blocks 171. The second leg 1412 can abut against any of the cross rods.

[0080] It is understandable that the limit member 170 can be integrally provided with the housing 2000 of the circuit breaker, or can be a separate component, which is assembled into the housing 2000 of the circuit breaker and used in conjunction with the torsion spring 141 when in use, and the present application does not impose any limitation on this.

[0081] By abutting the second leg 1412 against different limit gears 171, the abutment tightness between the first leg 1411 and the armature 120 is changed, thereby changing the force when the yoke 110 attracts the armature 120, so as to achieve the purpose of adapting to different abnormal currents of the circuit breaker, so that the instantaneous protection mechanism 1000 can be used for circuit breakers with different protection requirements.

[0082] According to another aspect of the embodiment of the present application, a circuit breaker is provided, such as Figure 4 As shown, the circuit breaker includes a housing 2000 , an arc extinguishing chamber 3000 and an instantaneous protection mechanism 1000 of any of the above embodiments, and an arc striking angle 200 of the instantaneous protection mechanism 1000 is located at an air inlet side of the arc extinguishing chamber 3000 .

[0083] The structure of the instantaneous protection mechanism 1000 in this embodiment of the present application may refer to the structure of the instantaneous protection mechanism 1000 in any of the above embodiments, which will not be described again here.

[0084] Since the circuit breaker in the embodiment of the present application adopts the instantaneous protection mechanism 1000 in the above-mentioned subject embodiment, the circuit breaker in the embodiment of the present application has the beneficial effects of simple structure, easy entry of the arc into the arc extinguishing chamber 3000, and extinguishing at a faster speed in the arc extinguishing chamber 3000.

[0085] To summarize, the embodiment of the present application connects the arc striking angle 200 to the release assembly 100, and the resistance of the substrate of the arc striking angle 200 is greater than the resistance of the coating, thereby being able to simplify the structure of the circuit breaker while ensuring the protection function of the instantaneous protection mechanism 1000 on the circuit where the circuit breaker is located, thereby improving the arc striking and arc extinguishing effects of the circuit breaker.

[0086] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0087] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An instantaneous protection mechanism, characterized in that: include: A release assembly, used to actuate when the current is abnormal, so as to drive the moving contact and the stationary contact of the circuit breaker to separate; An arc striking angle is connected to the tripper assembly, and the arc striking angle includes a substrate and a coating provided on the substrate, wherein the resistivity of the substrate is greater than the resistivity of the coating.

2. The instantaneous protection mechanism according to claim 1, characterized in that: The substrate is iron, and the plating layer is copper or nickel.

3. The instantaneous protection mechanism according to claim 1, characterized in that: The release assembly comprises a yoke, an armature, a terminal block and an elastic member; the terminal block is at least partially in contact with the yoke; the armature is rotatably arranged relative to the yoke, and the yoke is at least partially located in the rotation area of ​​the armature; the elastic member cooperates with the armature to drive the armature away from the yoke; When the current of the terminal block increases abnormally, the magnetic yoke attracts the armature to rotate, so that the release assembly is actuated.

4. The instantaneous protection mechanism according to claim 3, characterized in that: One end of the terminal block is bent to form a stationary contact, and the arc starting angle is connected to the stationary contact.

5. The instantaneous protection mechanism according to claim 4, characterized in that: The yoke comprises a bottom wall and two side walls arranged on both sides of the bottom wall, one end of the side wall away from the bottom wall is used to attract the armature, and the bottom wall is used to be close to the arc extinguishing chamber of the circuit breaker; The terminal block includes a first section and a second section parallel to the bottom wall, the first section is closer to the static contact than the second section, the first section is in contact with the bottom wall, and there is a gap between the second section and the bottom wall so that the current flows toward the static contact in the direction of the bottom wall opposite to the second section.

6. The instantaneous protection mechanism according to claim 5, characterized in that: The gap is greater than or equal to 1 mm.

7. The instantaneous protection mechanism according to claim 3, characterized in that: The elastic member comprises a plurality of torsion springs, each of the torsion springs comprises a torsion spring coil, a first leg facing a first direction, and a second leg facing a second direction; The release assembly further comprises a torsion spring shaft and a limiter, the torsion spring is coiled on the torsion spring shaft, the first leg abuts against the armature, and the second leg abuts against the limiter; The first direction and the second direction have an angle.

8. The instantaneous protection mechanism according to claim 7, characterized in that: The second legs of two adjacent torsion springs are close to each other and connected, or the second legs of two adjacent torsion springs are far away from each other and connected.

9. The instantaneous protection mechanism according to claim 7 or 8, characterized in that: The limiting member includes a plurality of limiting gears, and when the second leg abuts against different limiting gears, the abutment tightness between the first leg and the armature is different.

10. A circuit breaker, characterized in that: It comprises a shell, an arc extinguishing chamber and the instantaneous protection mechanism according to any one of claims 1 to 9, wherein the arc striking angle of the instantaneous protection mechanism is located at the air inlet side of the arc extinguishing chamber.

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