Static contact and circuit breaker

Abstract

The utility model discloses a static contact and a circuit breaker, and relates to the technical field of low-voltage electric appliances, the static contact is matched with a moving contact, and the static contact comprises a connecting main body, a winding part and a connecting part. The connecting main body is provided with an abdicating hole and is electrically connected to a main loop; the bypassing part is connected with the connecting main body, the bypassing part is arranged on one side, deviating from the moving contact, of the connecting main body, and the bypassing part is partially bent and extends into the abdicating hole; the connecting part is connected with the winding part, the connecting part is located on the side, away from the winding part, of the connecting body, a static contact is arranged on the connecting part, and the moving contact can abut against and be electrically connected to the static contact. When the static contact is electrically connected with the moving contact, the current direction in the connecting main body is the same as the current direction in the moving contact, and the moving contact is in close contact with the static contact in a short-circuit current environment. The device is used for keeping the moving contact and the static contact not to be opened and repelled at all under short-circuit current, so that damage to contacts of devices such as a circuit breaker is avoided, and the service life of the devices such as the circuit breaker is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a static contact and a circuit breaker. Background Art

[0002] In the relevant technical field, in the field of new energy, as the system voltage requirements continue to increase, in order to reduce maintenance costs and time, a combination of fuses and molded case circuit breakers is usually used. In this configuration, the fuse is mainly responsible for short-circuit protection, while the molded case circuit breaker only retains the overload protection function. However, this circuit breaker needs to have a high short-circuit tolerance. When a short-circuit current occurs in the system circuit, the moving contact and the static contact of the molded case circuit breaker should not be repelled. The short-circuit current protection is fully undertaken by the fuse, and the circuit is cut off. At this time, the circuit breaker has an isolation function that is convenient for later maintenance.

[0003] To ensure that the short-circuit withstand current of the circuit breaker is high enough during the fuse blowing process, the moving contact and the stationary contact should ideally remain completely connected. In this way, no arc will be generated between the moving contact and the stationary contact, thereby avoiding damage to the circuit breaker contacts and extending the service life of the circuit breaker.

[0004] However, the short-circuit withstand performance of existing circuit breakers is insufficient, and it is impossible to ensure that the moving contact and the static contact remain completely connected when the circuit is short-circuited. Utility Model Content

[0005] The present application provides a stationary contact and a circuit breaker, which are used to keep a moving contact and a stationary contact completely non-repelled under a short-circuit current, thereby avoiding damage to the contacts of components such as the circuit breaker, thereby extending the service life of components such as the circuit breaker.

[0006] In a first aspect, the present application provides a stationary contact, which is arranged in cooperation with a moving contact, and the stationary contact comprises: a connecting body, a bypass portion and a connecting portion.

[0007] The connecting body is provided with a clearance hole, and the connecting body is used to be electrically connected to the main circuit; the bypass part is connected to the connecting body, and the bypass part is arranged on the side of the connecting body away from the moving contact, and the bypass part is partially bent and extends into the clearance hole; the connecting part is connected to the bypass part, and the connecting part is located on the side of the connecting body away from the bypass part, and a static contact is arranged on the connecting part, and the moving contact can abut and be electrically connected to the static contact.

[0008] When the stationary contact is electrically connected to the moving contact, the direction of the current in the connection body is the same as the direction of the current in the moving contact. In a short-circuit current environment, the moving contact and the stationary contact are in close contact.

[0009] Based on the above examples of the present application, the coordination of the static contact and the moving contact can realize the disconnection and conduction of the main circuit. The connection body is the basic part of the static contact, which can be electrically connected to the external conductor with the connection terminal, so that the corresponding device such as the circuit breaker can be electrically connected to the main circuit. The connection body is provided with a terminal mounting portion.

[0010] With the setting of the bypass part, part of the connecting body will extend to a position spaced apart from the moving contact. Since the direction of the current on the connecting body is the same as that on the moving contact, this part of the connecting body will generate a first Lorentz force. The first Lorentz force can cause the moving contact and the static contact to attract each other. The current direction of some segments in the bypass part is opposite to that of the moving contact, and a second Lorentz force of mutual repulsion is generated between some segments in the bypass part and the moving contact.

[0011] Since the length of some segments in the detour is less than the length of the connecting body, and the distance between some segments in the detour and the moving contact is farther than the distance between the connecting body and the moving contact, the first Lorentz force is greater than the second Lorentz force, and the total Lorentz force between the static contact and the moving contact is the sum of the first Lorentz force and the second Lorentz force. The total Lorentz force on the static contact is manifested as a state in which the static contact and the moving contact attract each other. Moreover, the greater the current, the greater the attraction. In this way, the short-circuit withstand current of devices such as circuit breakers is high enough, and the moving contact and the static contact can remain completely non-repelled under the short-circuit current, thereby avoiding damage to the circuit breaker contacts and extending the service life of the circuit breaker.

[0012] In some examples, an insulating structure is provided in the clearance hole, and the insulating structure is used to increase the creepage distance between the connecting body and the bypass part; the insulating structure is provided between the hole wall of the clearance hole and the bypass part; or, the insulating structure is fixedly connected to the inner wall of the clearance hole; or, the insulating structure is fixedly connected to the outer peripheral surface of the bypass part.

[0013] Based on the above example of the present application, the purpose of providing an insulating structure inside the clearance hole is to increase the creepage distance between the connection body and the detour part, so as to ensure the safe and stable operation of the corresponding device. The insulating structure between the hole wall of the clearance hole and the detour part can play a role in isolating the electric field and preventing arc jumping.

[0014] In some examples, the clearance hole is a long hole structure arranged along the length direction of the connecting body, and the bypass portion partially extends into the long hole structure; the insulating structure is arranged as an insulating plate, and two insulating plates are arranged in the area between the inner wall of the long hole structure in the length direction and the bypass portion.

[0015] Based on the above examples of the present application, the shape of the clearance hole can be set as needed and is not limited to the above-mentioned long hole structure. The purpose of setting the clearance hole as a long hole structure is to enable the clearance hole to better cooperate with the bypass part and give full play to the role of the bypass part.

[0016] In some examples, the detour portion includes a first connecting segment, a second connecting segment, and a third connecting segment that are connected in sequence.

[0017] The first connecting section is arranged at an angle with the connecting body, a first end of the first connecting section is connected to the connecting body, and a second end of the first connecting section extends toward a side of the connecting body away from the moving contact.

[0018] The second connecting section is arranged at an angle with the first connecting section, the first end of the second connecting section is connected to the second end of the first connecting section, the second end of the second connecting section extends in a direction away from the first connecting section, and the second connecting section at least partially extends to the side of the clearance hole away from the moving contact relative to the connecting body.

[0019] The third connecting section is arranged at an angle with the second connecting section, the first end of the third connecting section is connected to the second end of the second connecting section, the second end of the third connecting section extends toward the direction of the clearance hole, the third connecting section is penetrated through the clearance hole, and there is a gap between the third connecting section and the inner wall of the clearance hole.

[0020] The connecting portion is arranged at the second end of the third connecting section.

[0021] Based on the above example of the present application, the detour portion is mainly composed of three parts, namely a first connecting section, a second connecting section and a third connecting section. The three parts are interconnected to form a complete structure.

[0022] The first connection section is set at an angle to the connection body, which means that its connection with the connection body is not a direct linear connection, but a certain angle. The two ends of the first connection section are respectively connected to the connection body and the second connection section. The first end of the first connection section is closely connected to the connection body, and the second end of the first connection section extends toward the side of the connection body away from the moving contact, which can reflect that the bypass direction of the bypass part is away from the moving contact. The first connection section plays a role of connecting transition between the connection body and the second connection section.

[0023] The second connecting section is arranged at an angle with the first connecting section. The first end of the second connecting section is connected to the second end of the first connecting section to form a continuous structure. The second end of the second connecting section extends in a direction away from the first connecting section, which is a bending and detour process. The second connecting section can cooperate with the moving contact to generate a second Lorentz force, that is, when the second connecting section is energized, the current direction is opposite to the energization direction of the moving contact, and the second connecting section and the moving contact repel each other.

[0024] The third connecting section is arranged at an angle to the second connecting section. The first end of the third connecting section is connected to the second end of the second connecting section, so that the first connecting section, the second connecting section and the third connecting section form a complete detour. The second end of the third connecting section extends toward the direction of the clearance hole, and the third connecting section is inserted into the clearance hole, and there is a gap between the third connecting section and the inner wall of the clearance hole. The setting of the clearance hole is to facilitate the clearance of the third connecting section.

[0025] The connecting portion is arranged at the second end of the third connecting section. Such an arrangement is conducive to forming a bypass loop, which facilitates the generation of a stronger first Lorentz force. The total Lorentz force on the static contact is then manifested as a state in which the static contact and the moving contact attract each other. The greater the current, the greater the attraction. The short-circuit withstand current of the circuit breaker and other devices is high enough, and the moving contact and the static contact can remain completely non-repelled under the short-circuit current.

[0026] In some examples, the first connecting segment, the second connecting segment, and the third connecting segment are an integrally arranged conductive bending structure.

[0027] Alternatively, at least one of the first connecting segment, the second connecting segment and the third connecting segment is an independent structure, and the interconnected positions are welded or soft-connected.

[0028] Alternatively, at least one of the first connecting section, the second connecting section and the third connecting section is configured as a flexible conductive structure, and the connecting portion is directly or indirectly mounted to an inner wall of a housing where the stationary contact is located.

[0029] Based on the above examples of the present application, three different connection segment designs are described above, which are: an integrally arranged conductive bending structure, an independent structure connection segment, and a flexible conductive structure connection segment. The arrangement of these connection segments can meet different application requirements.

[0030] In some examples, the connecting portion is arranged at an angle with the third connecting segment, the static contact is arranged on a side of the connecting portion facing away from the second connecting segment, and an arc starting angle is arranged on an end of the connecting portion facing away from the third connecting segment.

[0031] Based on the above examples of the present application, the connecting portion and the third connecting section are arranged at a certain angle, which is to achieve better connection performance and stability, and can enable the connecting portion to better cooperate with the connection of the moving contact.

[0032] A static contact is provided on the side of the connecting portion away from the second connecting section. The static contact can contact and electrically connect with the moving contact of the moving contact. An arc striking angle is provided on the end of the connecting portion away from the third connecting section. The arc striking angle can effectively guide the formation and disappearance of the arc, avoid the arc from damaging the connecting part, and thus extend the service life of the connecting component.

[0033] In some examples, a welding groove is formed on the connecting portion, and the arc starting angle is welded on the welding groove.

[0034] Based on the above example of the present application, after the welding groove is set on the connecting part, the arc starting angle can be welded on the welding groove. The arc starting angle is an important component in the welding process. It can guide the flow of current and generate a stable arc, thereby achieving high-quality welding. Welding the arc starting angle on the welding groove can ensure the stability and reliability of the welding process.

[0035] In some examples, the inner wall of the clearance hole facing away from the wiring terminal is a first inner wall, and the third connecting section is located in the clearance hole close to the first inner wall.

[0036] The connecting portion extends relative to the third connecting section toward a direction approaching the connecting terminal.

[0037] Based on the above-mentioned example of the present application, when the third connecting section is close to the position of the first inner wall, the detour distance of the detour portion is relatively short, and sufficient total Lorentz force can be generated. At this time, the connecting portion will need to extend in the direction close to the terminal, and the second connecting section, the third connecting section and the connecting portion cooperate to form a "Z"-shaped structure. At this time, the second connecting section can cooperate with the connecting body to form a total Lorentz force that attracts the moving contact and the static contact to each other, thereby better offsetting the repulsive force of the Holm force, so that the magnitude of the electric repulsive force cannot reach the level of tripping, and ensure that the moving contact and the static contact can maintain a completely non-repulsive performance under short-circuit current.

[0038] In some examples, the inner wall of the clearance hole close to the wiring terminal is the second inner wall, and the third connecting section is located in the clearance hole close to the second inner wall.

[0039] The connecting portion extends relative to the third connecting section in a direction away from the connecting terminal.

[0040] Based on the above-mentioned example of the present application, when the third connecting section is close to the position of the second inner wall, the detour distance of the detour portion is relatively long, and a stronger total Lorentz force can be generated. At this time, the connecting portion will need to extend in the direction away from the terminal, and the second connecting section, the third connecting section and the connecting portion can cooperate to form a "U"-shaped structure. At this time, the second connecting section can cooperate with the connecting body to form a total Lorentz force that attracts the moving contact and the static contact to each other, thereby better offsetting the repulsive force of the Holm force, so that the magnitude of the electric repulsive force cannot reach the level of tripping, and ensure that the moving contact and the static contact can maintain a completely non-repulsive performance under short-circuit current.

[0041] In a second aspect, the present application provides a circuit breaker, comprising the above-mentioned static contact and a housing, wherein the static contact is disposed in the housing.

[0042] Based on the above examples of the present application, a circuit breaker having the above-mentioned static contact can keep the moving contact and the static contact completely non-repelled under a short-circuit current, thereby avoiding damage to the circuit breaker contacts and extending the service life of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the examples or prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 This is a schematic diagram of the structure of a static contact in an example of the present application;

[0045] Figure 2 A schematic side view of a static contact in an example of the present application;

[0046] Figure 3 It is a cross-sectional schematic diagram of a static contact in an example of the present application;

[0047] Figure 4 This is a schematic diagram of the structure of another static contact in an example of the present application;

[0048] Figure 5 A schematic side view of another static contact in an example of the present application;

[0049] Figure 6 A cross-sectional schematic diagram of another static contact in an example of the present application;

[0050] Figure 7 This is a schematic diagram of the structure of a static contact and an insulating structure in cooperation in an example of the present application;

[0051] Figure 8This is a schematic diagram of a structural explosion when a static contact cooperates with an insulating structure in an example of the present application;

[0052] Fig. 9 This is a side view of a static contact and an insulating structure in cooperation in an example of the present application;

[0053] Fig.10 This is a side exploded schematic diagram of a static contact and an insulating structure in cooperation in an example of the present application;

[0054] Fig.11 This is a structural schematic diagram of a moving contact, a stationary contact and an insulating structure when they are matched and installed in a housing in an example of the present application;

[0055] Fig.12 This is a cross-sectional schematic diagram of a moving contact, a stationary contact, and an insulating structure when they are matched and installed in a housing in an example of the present application.

[0056] Reference numerals:

[0057] 100, static contact; 110, connecting body; 111, give way hole; 1111, first inner wall; 1112, second inner wall; 112, terminal mounting portion; 120, bypass portion; 121, first connecting section; 122, second connecting section; 123, third connecting section; 130, connecting portion; 131, static contact; 132, welding groove; 133, arcing angle; 140, insulating structure; 200, moving contact; 210, elastic member; 300, housing. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific examples described here are only used to explain the present application and are not used to limit the present application.

[0059] To solve the above technical problems, please refer to Figure 1-Figure 12 As shown, the first aspect of the present application proposes a static contact 100 for keeping the moving contact 200 and the static contact 100 completely non-repelled under a short-circuit current, thereby avoiding damage to the contacts of components such as circuit breakers, thereby extending the service life of components such as circuit breakers.

[0060] Reference Figures 1 to 12 In some examples of the present application, the static contact 100 is arranged in cooperation with the moving contact 200 , and the static contact 100 includes a connecting body 110 , a bypass portion 120 and a connecting portion 130 .

[0061] The connecting body 110 is provided with a clearance hole 111, and the connecting body 110 is used to be electrically connected to the main circuit; the bypass part 120 is connected to the connecting body 110, and the bypass part 120 is arranged on the side of the connecting body 110 away from the moving contact 200, and the bypass part 120 is partially bent and extends into the clearance hole 111; the connecting part 130 is connected to the bypass part 120, and the connecting part 130 is located on the side of the connecting body 110 away from the bypass part 120, and a static contact 131 is arranged on the connecting part 130, and the moving contact 200 can abut and be electrically connected to the static contact 131.

[0062] When the stationary contact 100 is electrically connected to the moving contact 200 , the direction of the current in the connection body 110 is the same as the direction of the current in the moving contact 200 . In a short-circuit current environment, the moving contact 200 and the stationary contact 100 are in close contact.

[0063] Based on the above example of the present application, the coordination of the static contact 100 and the moving contact 200 can realize the disconnection and conduction of the main circuit. The connection body 110 is the basic part of the static contact 100, which can be coordinated with the wiring terminal to be electrically connected to the external conductor, thereby enabling the corresponding device such as the circuit breaker to be electrically connected to the main circuit. The connection body 110 is provided with a wiring terminal mounting portion 112.

[0064] When the stationary contact 100 and the moving contact 200 are conducting, an electromotive repulsive force will be generated between the stationary contact 100 and the moving contact 200. The electromotive repulsive force can be specifically the sum of the Holm force and the Lorentz force. Among them, the electrical connection position between the stationary contact 100 and the moving contact 200 will generate a mutually repulsive Holm force, and the current flowing through the stationary contact 100 and the moving contact 200, the interval-set and current-direction-in-the-same part will generate a first Lorentz force of mutual attraction, and the interval-set and current-direction-in-the-opposite part will generate a second Lorentz force of mutual repulsion.

[0065] In the normal conduction state, the elastic member 210 on the moving contact 200 will have an elastic preload force greater than the electric repulsion force, and the stationary contact 100 and the moving contact 200 will maintain an abutment state. When the short-circuit current passes through the moving contact 200 and the stationary contact 100, the conventional structure of the stationary contact 100 will generate a sufficiently large electric repulsion force to repel the connection between the stationary contact 100 and the moving contact 200, overcome the elastic preload force on the elastic member 210, and then make the device's release reach the working state and trip the entire device.

[0066] In the present application, with the arrangement of the detour 120, part of the connecting body 110 will extend to a position spaced apart from the moving contact 200. Since the direction of the current on the connecting body 110 is the same as the direction of the current on the moving contact 200, this part of the connecting body 110 will generate a first Lorentz force, which can cause the moving contact 200 and the stationary contact 100 to attract each other. The direction of the current in some segments of the detour 120 is opposite to the direction of the current in the moving contact 200, and mutual attraction is generated between some segments of the detour 120 and the moving contact 200. The second repulsive Lorentz force, since the length of some segments in the detour 120 is less than the length of the connecting body 110, and the distance between some segments in the detour 120 and the moving contact 200 is farther than the distance between the connecting body 110 and the moving contact 200, the first Lorentz force is greater than the second Lorentz force, and the total Lorentz force between the static contact 100 and the moving contact 200 is the sum of the first Lorentz force and the second Lorentz force, and the total Lorentz force on the static contact 100 is manifested as a state in which the static contact 100 and the moving contact 200 attract each other. Moreover, the greater the current, the greater the attraction. In addition, the short-circuit withstand current of devices such as circuit breakers is high enough, and the moving contact 200 and the static contact 100 can remain completely non-repulsive under the short-circuit current, thereby avoiding damage to the circuit breaker contacts, thereby extending the service life of the circuit breaker.

[0067] The connecting part 130 is the main part of the electrical connection between the static contact 100 and the moving contact 200, and the static contact on the connecting part 130 can be abutted and connected with the moving contact on the moving contact 200. The clearance hole 111 can provide a rotation space for the detour part 120 to detour, and facilitate the connection between the connecting part 130 and the detour part 120.

[0068] The above implementation method mainly has the following advantages:

[0069] 1. The short-time withstand current of the device is improved. By redesigning the structure of the static contact 100, the direction of the current is successfully changed by using the bypass portion 120. Taking the circuit breaker as an example, this makes the short-time withstand current significantly improved in the same molded case circuit breaker. This improvement can ensure the stability of the circuit breaker operation under high current when the circuit breaker is used in application scenarios that need to handle high current.

[0070] 2. Optimization of contact spring pressure. The traditional solution is to increase the final pressure of the contact by increasing the contact spring, but this only improves the short-time withstand current to a limited extent. The present application increases the short-time withstand current by setting the bypass portion 120 without increasing the pressure of the contact spring, thereby avoiding the reduction of mechanical and electrical life that may be caused by increasing the spring pressure. Under the same short-time withstand current conditions, the mechanical and electrical life of the implementation of the present application is higher.

[0071] 3. Improve the overall life of the product. Since there is no increase in the pressure of the contact spring, the mechanical and electrical life of the product will not be reduced due to the increase in the contact spring pressure. This not only improves the performance of short-term current withstand, but also ensures a longer service life of the product.

[0072] 4. It has a wider application prospect. For many application scenarios that need to handle large currents and require high durability of equipment (such as power systems, industrial automation, etc.), the implementation methods of this application can provide sufficient solutions. It not only improves the performance of the corresponding equipment, but also prolongs the service life of the equipment, and has a very broad market application prospect.

[0073] Reference Figures 7 to 12 In some examples of the present application, an insulating structure 140 is arranged in the clearance hole 111, and the insulating structure 140 is used to increase the creepage distance between the connecting body 110 and the bypass part 120; the insulating structure 140 is arranged between the hole wall of the clearance hole 111 and the bypass part 120; or, the insulating structure 140 is fixedly connected to the inner wall of the clearance hole 111; or, the insulating structure 140 is fixedly connected to the outer peripheral surface of the bypass part 120.

[0074] Based on the above example of the present application, the insulating structure 140 is provided inside the clearance hole 111 to increase the creepage distance between the connecting body 110 and the bypass portion 120, so as to ensure the safe and stable operation of the corresponding device. The insulating structure 140 between the hole wall of the clearance hole 111 and the bypass portion 120 can play a role in isolating the electric field and preventing arc jumping.

[0075] There are many ways to set the position of the insulating structure 140. The insulating structure 140 can be set between the hole wall of the clearance hole 111 and the bypass part 120. This method can effectively increase the creepage distance between the connecting body 110 and the bypass part 120, thereby reducing the possibility of arc jumping. The insulating structure 140 can also be fixedly connected to the inner wall of the clearance hole 111. This method can ensure that the insulating structure 140 is firm and stable and not easily affected by the external environment. The insulating structure 140 can also be fixedly connected to the outer peripheral surface of the bypass part 120. This method can ensure that the insulating structure 140 is closely fitted with the bypass part 120, thereby improving the insulation effect.

[0076] In practical applications, according to different scenarios and requirements, a suitable setting method of the insulating structure 140 can be selected. However, no matter which method is adopted, the function of the insulating structure 140 is the same, that is, to increase the creepage distance between the connecting body 110 and the bypass portion 120 to improve the insulation performance and safety performance of the corresponding position.

[0077] In some examples of the present application, the clearance hole 111 is a long hole structure arranged along the length direction of the connecting body 110, and the bypass portion 120 partially extends into the long hole structure; the insulating structure 140 is arranged as an insulating plate, and two insulating plates are arranged in the area between the inner wall of the long hole structure in the length direction and the bypass portion 120.

[0078] Based on the above example of the present application, the shape of the clearance hole 111 can be set as needed and is not limited to the above-mentioned long hole structure. The purpose of setting the clearance hole 111 as a long hole structure is to enable the clearance hole 111 to better cooperate with the bypass part 120 and give full play to the role of the bypass part 120.

[0079] The making way hole 111 is mainly used to make way for the bypass portion 120. After part of the bypass portion 120 is extended into the long hole structure, more layout space can be saved, which is conducive to the miniaturization of devices such as circuit breakers.

[0080] The insulating plate has strong insulating properties and can effectively increase the creepage distance between the bypass portion 120 and the connection body 110 to ensure safe operation of the device. When two insulating plates are provided, both sides of the bypass portion 120 can be isolated by the two insulating plates.

[0081] The insulating structure 140 may also be configured as a barrel-shaped structure as required. The insulating structure 140 may be sleeved in the clearance hole 111 and located on the outer peripheral side of the bypass portion 120 to achieve a better insulation effect.

[0082] In some examples of the present application, the detour portion 120 includes a first connecting segment 121 , a second connecting segment 122 , and a third connecting segment 123 that are sequentially connected.

[0083] The first connection section 121 is arranged at an angle to the connection body 110 , a first end of the first connection section 121 is connected to the connection body 110 , and a second end of the first connection section 121 extends toward a side of the connection body 110 away from the moving contact 200 .

[0084] The second connecting section 122 is arranged at an angle to the first connecting section 121, the first end of the second connecting section 122 is connected to the second end of the first connecting section 121, the second end of the second connecting section 122 extends in a direction away from the first connecting section 121, and the second connecting section 122 at least partially extends to the side of the clearance hole 111 away from the moving contact 200 relative to the connecting body 110.

[0085] The third connecting section 123 is arranged at an angle with the second connecting section 122. The first end of the third connecting section 123 is connected to the second end of the second connecting section 122. The second end of the third connecting section 123 extends toward the direction of the clearance hole 111. The third connecting section 123 passes through the clearance hole 111, and there is a gap between the third connecting section 123 and the inner wall of the clearance hole 111.

[0086] The connecting portion 130 is disposed at the second end of the third connecting section 123 .

[0087] Based on the above example of the present application, the detour portion 120 is mainly composed of three parts, namely a first connecting section 121, a second connecting section 122 and a third connecting section 123. The three parts are connected to each other to form a complete structure.

[0088] The first connection section 121 is set at an angle to the connection body 110, which means that its connection with the connection body 110 is not a direct linear connection, but a certain angle. The two ends of the first connection section 121 are respectively connected to the connection body 110 and the second connection section 122. The first end of the first connection section 121 is closely connected to the connection body 110, and the second end of the first connection section 121 extends toward the side of the connection body 110 away from the moving contact 200, which can reflect that the detour direction of the detour portion 120 is away from the moving contact 200. The first connection section 121 plays a role of connecting and transitioning between the connection body 110 and the second connection section 122.

[0089] The second connecting section 122 is arranged at an angle to the first connecting section 121. The first end of the second connecting section 122 is connected to the second end of the first connecting section 121 to form a continuous structure. The second end of the second connecting section 122 extends in a direction away from the first connecting section 121, which is a bending and detour process. The second connecting section 122 can cooperate with the moving contact 200 to generate a second Lorentz force, that is, when the second connecting section 122 is powered on, the current direction is opposite to the power-on direction of the moving contact 200, and the second connecting section 122 and the moving contact 200 repel each other.

[0090] The third connecting section 123 is arranged at an angle to the second connecting section 122. The first end of the third connecting section 123 is connected to the second end of the second connecting section 122, so that the first connecting section 121, the second connecting section 122 and the third connecting section 123 form a complete detour portion 120. The second end of the third connecting section 123 extends toward the direction of the clearance hole 111, and the third connecting section 123 is inserted into the clearance hole 111, and there is a gap between the third connecting section 123 and the inner wall of the clearance hole 111. The setting of the clearance hole 111 is to facilitate the clearance of the third connecting section 123.

[0091] The connecting portion 130 is arranged at the second end of the third connecting section 123. Such an arrangement is conducive to forming a bypass loop, which is convenient for generating a stronger first Lorentz force. Then the total Lorentz force on the static contact 100 is manifested as a state in which the static contact 100 and the moving contact 200 attract each other. The greater the current, the greater the attraction effect. The short-circuit withstand current of the circuit breaker and other devices is high enough, and the moving contact 200 and the static contact 100 can remain completely non-repelled under the short-circuit current.

[0092] In some examples of the present application, the first connecting segment 121 , the second connecting segment 122 , and the third connecting segment 123 are an integrally arranged conductive bending structure.

[0093] Alternatively, at least one of the first connecting section 121, the second connecting section 122 and the third connecting section 123 is an independent structure, and the interconnected positions are welded or soft-connected.

[0094] Alternatively, at least one of the first connecting section 121 , the second connecting section 122 and the third connecting section 123 is configured as a flexible conductive structure, and the connecting portion 130 is directly or indirectly mounted to the inner wall of the housing 300 where the static contact 100 is located.

[0095] Based on the above examples of the present application, three different connection segment designs are described above, which are: an integrally arranged conductive bending structure, an independent structure connection segment, and a flexible conductive structure connection segment. The arrangement of these connection segments can meet different application requirements.

[0096] The integrated conductive bending structure is characterized by the first connecting segment 121, the second connecting segment 122 and the third connecting segment 123 being integrated. This structural design enables the connecting segment to effectively reduce resistance and energy loss when transmitting current. In addition, this integrated setting also enables the connecting segment to have better stability when subjected to mechanical stress.

[0097] In the case where at least one of the first connecting section 121, the second connecting section 122 and the third connecting section 123 is an independent structure, they can be connected to each other by welding or flexible connection. This design scheme not only ensures the independence of the connecting sections, but also realizes the effective connection between them. In practical applications, this connection method can greatly improve the flexibility and scalability of the system, while reducing maintenance costs.

[0098] At least one of the first connecting section 121, the second connecting section 122 and the third connecting section 123 can be configured as a flexible conductive structure. This structural design enables the connecting section to be directly or indirectly connected to the inner wall of the housing 300 where the static contact 100 is located to achieve stable connection. The provision of the flexible conductive structure can effectively reduce the risk of breakage caused by thermal expansion and contraction or other mechanical stresses, thereby improving the life and reliability of the connecting section.

[0099] In some examples of the present application, the connection portion 130 is arranged at an angle with the third connection segment 123 , a static contact 131 is arranged on the side of the connection portion 130 facing away from the second connection segment 122 , and an arc starting angle 133 is arranged on the end of the connection portion 130 facing away from the third connection segment 123 .

[0100] Based on the above example of the present application, the connection portion 130 and the third connection section 123 are arranged at a certain angle to achieve better connection performance and stability, so that the connection portion 130 can better cooperate with the connection of the moving contact 200 .

[0101] A static contact 131 is provided on one side of the connecting portion 130 away from the second connecting section 122. The static contact 131 can be in contact with and electrically connected to the moving contact of the moving contact 200. An arc striking angle 133 is provided on the end of the connecting portion 130 away from the third connecting section 123. The arc striking angle 133 can effectively guide the formation and disappearance of the arc, prevent the arc from damaging the connecting portion 130, and thus extend the service life of the connecting portion 130.

[0102] In some examples of the present application, a welding groove 132 is formed on the connecting portion 130 , and the arc starting angle 133 is welded on the welding groove 132 .

[0103] Based on the above example of the present application, after the welding groove 132 is provided on the connecting portion 130, the arc starting angle 133 can be welded on the welding groove 132. The arc starting angle 133 is an important component in the welding process, which can guide the flow of current and generate a stable arc, thereby achieving high-quality welding. Welding the arc starting angle 133 on the welding groove 132 can ensure the stability and reliability of the welding process.

[0104] The size and shape of the welding groove 132 need to be designed according to actual needs and welding requirements. During the processing, it is necessary to ensure that the surface of the welding groove 132 is smooth, free of burrs and welding slag, so as to avoid adverse effects on the welding quality.

[0105] During the welding process of the arc starting angle 133 and the welding groove 132, parameters such as welding current, voltage and welding speed need to be strictly controlled to ensure welding quality. At the same time, welding operators need to have certain skills and experience to perform welding operations in complex environments.

[0106] After the arc starting angle 133 and the welding groove 132 are welded, the weld joint is inspected. The inspection content includes welding quality, weld shape and strength, etc. Ensure that the quality of the weld joint meets the specified requirements to ensure the stability and safety of the entire welded structure.

[0107] Reference Figures 1 to 3In some examples of the present application, the inner wall of the clearance hole 111 away from the terminal is the first inner wall 1111, and the third connecting section 123 is located in the clearance hole 111 near the first inner wall 1111. The connecting portion 130 extends in a direction close to the terminal relative to the third connecting section 123.

[0108] Based on the above example of the present application, when the third connecting section 123 is close to the first inner wall 1111, the detour distance of the detour portion 120 is relatively short, and sufficient total Lorentz force can be generated. At this time, the connecting portion 130 will need to extend in the direction close to the terminal, and the second connecting section 122, the third connecting section 123 and the connecting portion 130 cooperate to form a "Z"-shaped structure. At this time, the second connecting section 122 can cooperate with the connecting body 110 to form a total Lorentz force that attracts the moving contact 200 and the static contact 100 to each other, and then better offset the repulsive force of the Holm force, so that the magnitude of the electric repulsive force cannot reach the level of tripping, and ensure that the moving contact 200 and the static contact 100 can maintain a completely non-repulsive performance under short-circuit current.

[0109] Reference Figures 4 to 6 In some examples of the present application, the inner wall of the clearance hole 111 close to the terminal block is the second inner wall 1112 , and the third connecting section 123 is located in the clearance hole 111 close to the second inner wall 1112 .

[0110] The connecting portion 130 extends in a direction away from the connecting terminal relative to the third connecting section 123 .

[0111] Based on the above example of the present application, when the third connecting section 123 is close to the position of the second inner wall 1112, the detour distance of the detour portion 120 is relatively long, and a stronger total Lorentz force can be generated. At this time, the connecting portion 130 will need to extend in the direction away from the terminal, and the second connecting section 122, the third connecting section 123 and the connecting portion 130 can cooperate to form a "U"-shaped structure. At this time, the second connecting section 122 can cooperate with the connecting body 110 to form a total Lorentz force that attracts the moving contact 200 and the static contact 100 to each other, and can better offset the repulsive force of the Holm force, so that the magnitude of the electric repulsive force cannot reach the level of tripping, and ensure that the moving contact 200 and the static contact 100 can maintain a completely non-repulsive performance under short-circuit current.

[0112] In a second aspect, the present application provides a circuit breaker, comprising the above-mentioned static contact 100 and a housing 300 , wherein the static contact 100 is disposed in the housing 300 .

[0113] Based on the above example of the present application, the circuit breaker having the above static contact 100 can keep the moving contact 200 and the static contact 100 completely non-repelled under the short-circuit current, thereby avoiding damage to the circuit breaker contacts and extending the service life of the circuit breaker.

[0114] The coordination of the static contact 100 and the moving contact 200 can realize the disconnection and conduction of the main circuit. The connection body 110 is the basic part of the static contact 100, which can be electrically connected to the external conductor in coordination with the wiring terminal, so as to make the corresponding device such as the circuit breaker electrically connected to the main circuit. The connection body 110 is provided with a wiring terminal mounting portion 112.

[0115] With the setting of the bypass portion 120, part of the connecting body 110 will extend to a position spaced apart from the moving contact 200. Since the direction of the current on the connecting body 110 is the same as the direction of the current on the moving contact 200, this part of the connecting body 110 will generate a first Lorentz force, which can cause the moving contact 200 and the static contact 100 to attract each other. The current direction of some segments in the bypass portion 120 is opposite to the current direction of the moving contact 200, and a second Lorentz force of mutual repulsion is generated between some segments in the bypass portion 120 and the moving contact 200.

[0116] Since the length of some segments in the detour 120 is less than the length of the connecting body 110, and the distance between some segments in the detour 120 and the moving contact 200 is farther than the distance between the connecting body 110 and the moving contact 200, the first Lorentz force is greater than the second Lorentz force, and the total Lorentz force between the static contact 100 and the moving contact 200 is the sum of the first Lorentz force and the second Lorentz force. The total Lorentz force on the static contact 100 is manifested as a state in which the static contact 100 and the moving contact 200 attract each other. Moreover, the greater the current, the greater the attraction. In this way, the short-circuit withstand current of devices such as circuit breakers is high enough, and the moving contact 200 and the static contact 100 can remain completely non-repelled under the short-circuit current, thereby avoiding damage to the circuit breaker contacts and extending the service life of the circuit breaker.

[0117] The same or similar numbers in the drawings of this application correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0118] The above are only preferred examples of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A stationary contact, characterized in that: The static contact is arranged in cooperation with the moving contact and comprises: A connecting body is provided with a clearance hole, and the connecting body is used for being electrically connected to the main circuit; A bypass portion connected to the connection body, the bypass portion is arranged on a side of the connection body away from the moving contact, and the bypass portion is partially bent and extends into the clearance hole; A connecting portion connected to the bypass portion, the connecting portion being located on a side of the connecting body away from the bypass portion, the connecting portion being provided with a static contact, the moving contact being able to abut against and be electrically connected to the static contact; When the stationary contact is electrically connected to the moving contact, the direction of the current in the connection body is the same as the direction of the current in the moving contact. In a short-circuit current environment, the moving contact and the stationary contact are in close contact.

2. The stationary contact according to claim 1, characterized in that: An insulating structure is arranged in the clearance hole, and the insulating structure is used to increase the creepage distance between the connecting body and the detour part; The insulating structure is arranged between the hole wall of the clearance hole and the detour portion; Alternatively, the insulating structure is fixedly connected to the inner wall of the clearance hole; Alternatively, the insulating structure is fixedly connected to the outer circumferential surface of the bypass portion.

3. The stationary contact according to claim 2, characterized in that: The clearance hole is a long hole structure arranged along the length direction of the connecting body, and the detour portion partially extends into the long hole structure; The insulating structure is configured as an insulating plate, two insulating plates are provided, and the insulating plates are arranged in a region between an inner wall in a length direction of the long hole structure and the detour portion.

4. The stationary contact according to claim 3, characterized in that: The detour portion comprises a first connecting section, a second connecting section and a third connecting section which are connected in sequence; The first connecting section is arranged at an angle with the connecting body, a first end of the first connecting section is connected to the connecting body, and a second end of the first connecting section extends toward a side of the connecting body away from the moving contact; The second connecting section is arranged at an angle with the first connecting section, the first end of the second connecting section is connected to the second end of the first connecting section, the second end of the second connecting section extends in a direction away from the first connecting section, and the second connecting section at least partially extends to a side of the clearance hole relative to the connecting body away from the moving contact; The third connecting section is arranged at an angle with the second connecting section, the first end of the third connecting section is connected to the second end of the second connecting section, the second end of the third connecting section extends toward the direction of the clearance hole, the third connecting section is penetrated through the clearance hole, and there is a gap between the third connecting section and the inner wall of the clearance hole; The connecting portion is arranged at the second end of the third connecting section.

5. The stationary contact according to claim 4, characterized in that: The first connecting section, the second connecting section and the third connecting section are an integrally arranged conductive bending structure; or, At least one of the first connecting section, the second connecting section and the third connecting section is an independent structure, and the interconnected positions are welded or soft-connected; or, At least one of the first connecting section, the second connecting section and the third connecting section is configured as a flexible conductive structure, and the connecting portion is directly or indirectly mounted to an inner wall of a housing where the stationary contact is located.

6. The stationary contact according to claim 4 or 5, characterized in that: The connecting portion is arranged at an angle with the third connecting section, the static contact is arranged on a side of the connecting portion away from the second connecting section, and an arc starting angle is arranged on an end of the connecting portion away from the third connecting section.

7. The stationary contact according to claim 4 or 5, characterized in that: The inner wall of the clearance hole facing away from the wiring terminal is a first inner wall, and the third connecting section is located in the clearance hole close to the first inner wall; The connecting portion extends relative to the third connecting section toward a direction approaching the connecting terminal.

8. The stationary contact according to claim 4 or 5, characterized in that: The inner wall of the clearance hole close to the wiring terminal is the second inner wall, and the third connecting section is located in the clearance hole close to the second inner wall; The connecting portion extends relative to the third connecting section in a direction away from the connecting terminal.

9. The stationary contact according to claim 6, characterized in that: A welding groove is provided on the connecting portion, and the arc starting angle is welded on the welding groove.

10. A circuit breaker, characterized in that: include: The stationary contact according to any one of claims 1 to 9; and, The housing is provided with the static contact.

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