Anti-short circuit structure and relay

Abstract

The application provides an anti-short-circuit structure and a relay, and relates to the technical field of electrical equipment. The anti-short-circuit structure comprises a moving contact, a first magnetic conducting member and a second magnetic conducting member. At least two first magnetic conducting members are arranged on the top side of the moving contact in a spaced manner; the second magnetic conducting member is arranged on the bottom side of the moving contact, and at least part of the second magnetic conducting member is extended from the bottom side to the top side by the two side edges and the middle part of the moving contact to correspond to the at least two first magnetic conducting members, to form a magnetic conducting loop together with the at least two first magnetic conducting members in the state that the moving contact is electrified, to form an attractive force between the magnetic pole surfaces of the first magnetic conducting member and the second magnetic conducting member to resist the electric repulsive force, to form reliable electrical connection, to avoid the repulsive force between the moving contact and the static contact in the abnormal circuit failure state such as current abnormality, to ensure the stable contact between the moving contact and the static contact, and thus to effectively improve the operation stability of the contact assembly and the resistance to short-circuit current.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, and more specifically, to a short-circuit resistant structure and a relay. Background Technology

[0002] Current electrical devices, such as relays, can withstand extremely large currents under abnormal circuit conditions such as short circuits. The electromagnetic repulsion generated by this short-circuit current may cause the contacts to separate, which in turn can lead to arcing. Such arcing may cause the sealed cavity to burn and endanger other electrical components or battery systems.

[0003] To address this issue, current market solutions typically employ magnetization designs. This involves incorporating magnetic conductors to generate a magnetic field that acts on the contacts, increasing the contact force between the moving and stationary contacts. However, due to limited installation space, existing magnetization designs are often inadequate and fail to effectively enhance the magnetic field strength, leaving the moving and stationary contacts at risk of separation due to repulsive forces. Summary of the Invention

[0004] This invention provides a short-circuit resistant structure and relay, which can effectively generate an attractive force on the moving contact and resist electrical repulsion to form a reliable electrical connection, thereby effectively improving the operational stability of the contact assembly and its ability to withstand short-circuit current.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a short-circuit resistant structure, comprising:

[0007] Moving contact;

[0008] First magnetic conductive element, at least two first magnetic conductive elements are spaced apart on the top side of the moving contact;

[0009] The second magnetic conductive element is disposed on the bottom side of the moving contact, and at least a portion of the second magnetic conductive element extends from both sides and the middle of the moving contact toward the first magnetic conductive element, so as to correspond to at least two of the first magnetic conductive elements respectively, so as to form a magnetic conductive circuit together with at least two of the first magnetic conductive elements when the moving contact is energized.

[0010] In an optional embodiment, the second magnetic conductive member includes a first magnetic conductive part, a second magnetic conductive part, and a third magnetic conductive part. The first magnetic conductive part and the second magnetic conductive part are both connected to the third magnetic conductive part, and the third magnetic conductive part is disposed on the bottom side of the moving contact.

[0011] The first magnetic conductive part is disposed on both sides of the moving contact and corresponds to at least a portion of the two first magnetic conductive elements located at both ends, and the second magnetic conductive part passes through the moving contact and corresponds to at least a portion of the two adjacent first magnetic conductive elements.

[0012] In an optional embodiment, when the moving contact is energized, the first magnetic conductive part, the third magnetic conductive part, and the two first magnetic conductive elements together form a magnetic conductive circuit.

[0013] In an optional embodiment, a plurality of the first magnetic conductive elements are equally spaced on the top side of the moving contact in a direction perpendicular to the direction of current flow through the moving contact.

[0014] In an optional embodiment, the number of the second magnetic conductive parts is one less than the number of the first magnetic conductive elements, and the second magnetic conductive parts correspond to at least a portion of two adjacent first magnetic conductive elements.

[0015] In an optional embodiment, the moving contact is provided with a mounting hole, and the shape of the mounting hole is adapted to the shape of the second magnetic part, which is disposed in the mounting hole.

[0016] In an optional embodiment, when the moving contact is energized, the current also passes through the second magnetic conductive part.

[0017] In an optional embodiment, there are two first magnetic conductive parts and one second magnetic conductive part. The second magnetic conductive part is located between the two first magnetic conductive parts. The two first magnetic conductive parts correspond to the opposite ends of the two first magnetic conductive parts, and the second magnetic conductive part corresponds to the opposite ends of the two first magnetic conductive parts.

[0018] In an optional embodiment, the first magnetic conductor and the second magnetic conductor form a magnetic circuit, and the first magnetic conductor and the second magnetic conductor include at least four attraction surfaces on the magnetic circuit.

[0019] In a second aspect, the present invention provides a relay including a short-circuit protection structure as described in any of the foregoing embodiments.

[0020] The beneficial effects of the anti-short-circuit structure and relay provided in the embodiments of the present invention include: by setting at least two first magnetic conductive elements on the top side of the moving contact and setting a second magnetic conductive element on the bottom side of the moving contact, and by extending at least a portion of the second magnetic conductive element along the bottom side to the top side of the moving contact, that is, extending from both sides and the middle of the moving contact toward the first magnetic conductive element, so as to correspond to at least two first magnetic conductive elements respectively, a magnetic conductive circuit is formed between the first magnetic conductive element and the second magnetic conductive element, and the attraction force formed between the magnetic pole surfaces of the first magnetic conductive element and the second magnetic conductive element resists the electrical repulsion force, so as to form a reliable electrical connection, avoiding the separation of the moving contact and the stationary contact due to repulsion force under abnormal circuit fault conditions such as abnormal current, ensuring stable contact between the moving contact and the stationary contact, thus effectively improving the operating stability of the contact assembly and the withstand capability of short-circuit current. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is one of the schematic diagrams of the anti-short-circuit structure provided in the embodiments of the present invention;

[0023] Figure 2 Exploded view of the anti-short-circuit structure provided in the embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the cross-sectional magnetic field of the anti-short-circuit structure provided in an embodiment of the present invention;

[0025] Figure 4 This is a second schematic diagram of the anti-short-circuit structure provided in an embodiment of the present invention;

[0026] Figure 5 This is the third schematic diagram of the anti-short-circuit structure provided in the embodiment of the present invention;

[0027] Figure 6 A cross-sectional magnetic field diagram of another embodiment of the anti-short-circuit structure provided in this invention.

[0028] Icons: 10 - Short-circuit protection structure; 100 - Moving contact; 110 - Mounting hole; 200 - First magnetic conductive element; 210 - Chamfer; 300 - Second magnetic conductive element; 310 - First magnetic conductive part; 320 - Second magnetic conductive part; 330 - Third magnetic conductive part. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0033] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0034] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0035] Current electrical devices, such as relays, can withstand extremely high currents under abnormal circuit conditions such as short circuits. The electromagnetic repulsion generated by this short-circuit current may cause the contacts to separate, which in turn can lead to arcing. Such arcing may cause the sealed cavity to burn and endanger other electrical components or battery systems.

[0036] To address this issue, current market solutions typically employ magnetization designs. This involves incorporating magnetic conductors to generate a magnetic field that acts on the contacts, increasing the contact force between the moving and stationary contacts. However, due to limited installation space, existing magnetization designs are often inadequate and fail to effectively enhance the magnetic field strength, leaving the moving and stationary contacts at risk of separation due to repulsive forces.

[0037] Based on the problems existing in the current technology, please refer to Figures 1 to 3 This invention provides a short-circuit resistant structure 10, applicable to electrical equipment such as circuit breakers. The short-circuit resistant structure 10 provided by this invention is rationally designed, effectively generating an attractive force on the moving contact 100 and resisting electrical repulsion to form a reliable electrical connection, thereby effectively improving the operational stability of the contact assembly and its ability to withstand short-circuit currents.

[0038] In detail, the short-circuit protection structure 10 includes a moving contact 100, a first magnetic conductive element 200, and a second magnetic conductive element 300.

[0039] At least two first magnetic conductive elements 200 are spaced apart on the top side of the moving contact 100; a second magnetic conductive element 300 is disposed on the bottom side of the moving contact 100, and at least a portion of the second magnetic conductive element 300 extends from the bottom side to the top side from both sides and the middle of the moving contact 100, so as to correspond to at least two first magnetic conductive elements 200 respectively, so as to form a magnetic conductive circuit together with at least two first magnetic conductive elements 200 when the moving contact 100 is energized.

[0040] In this embodiment, the moving contact 100 is used to contact the stationary contact so that the circuit in which it is located is connected to form an electrical loop. Therefore, by providing at least two first magnetic conductive elements 200 on the top side of the moving contact 100 and providing a second magnetic conductive element 300 on the bottom side of the moving contact 100, and by extending at least a portion of the second magnetic conductive element 300 along the bottom side to the top side of the moving contact 100, that is, the second magnetic conductive element 300 extends from both sides and the middle of the moving contact 100 toward the first magnetic conductive elements 200, so as to respectively contact at least two first magnetic conductive elements 200. The components 200 correspond to each other, thereby forming a magnetic circuit between the first magnetic component 200 and the second magnetic component 300. The attraction between the magnetic pole surfaces of the first magnetic component 200 and the second magnetic component 300 resists the electrical repulsion, thus forming a reliable electrical connection. This avoids the separation of the moving contact 100 and the stationary contact due to repulsion under abnormal circuit fault conditions such as abnormal current, ensuring stable contact between the moving contact 100 and the stationary contact. Therefore, it effectively improves the operational stability of the contact assembly and its ability to withstand short-circuit current.

[0041] In detail, the second magnetic conductive member 300 includes a first magnetic conductive part 310, a second magnetic conductive part 320 and a third magnetic conductive part 330. The first magnetic conductive part 310 and the second magnetic conductive part 320 are both connected to the third magnetic conductive part 330, and the third magnetic conductive part 330 is disposed on the bottom side of the moving contact 100.

[0042] The first magnetic conductive part 310 is disposed on both sides of the moving contact 100 and corresponds to at least a portion of the two first magnetic conductive elements 200 located at both ends, and the second magnetic conductive part 320 passes through the moving contact 100 and corresponds to at least a portion of the two adjacent first magnetic conductive elements 200.

[0043] Specifically, the first magnetic conductive element 200, the first magnetic conductive part 310 and the third magnetic conductive part 330 are arranged around the moving contact 100, and the second magnetic conductive part 320 passes through the moving contact 100.

[0044] Therefore, when the moving contact 100 is energized, the first magnetic conductive part 310, the third magnetic conductive part 330, and the two first magnetic conductive elements 200 together form a magnetic conductive circuit.

[0045] In this embodiment, when the moving contact 100 and the stationary contact are closed, the first magnetic conductor 200 is located on the top side of the moving contact 100 and corresponds to the second magnetic conductor 300, so as to form a magnetic circuit between the first magnetic conductor 310 and the third magnetic conductor 330 of the first magnetic conductor 200 and the second magnetic conductor 300.

[0046] In this case, the first magnetic conductor 200 and the second magnetic conductor 300 include at least four attraction surfaces in the magnetic circuit.

[0047] It is understandable that when the moving contact 100 and the stationary contact are closed, the moving contact 100 and the first magnetic conductor 200 can be in direct contact or have a certain gap.

[0048] It should be noted that when the moving contact 100 is energized, the current also passes through the second magnetic part 320.

[0049] Furthermore, a plurality of first magnetic conductive elements 200 are equally spaced on the top side of the moving contact 100 in a direction perpendicular to the direction of current flow through the moving contact 100, so that the plane in which the magnetic conductive loop is formed between the first magnetic conductive elements 200 and the second magnetic conductive elements 300 is perpendicular to the direction of current flow.

[0050] Furthermore, the moving contact 100 is provided with a mounting hole 110, and the shape of the mounting hole 110 is adapted to the shape of the second magnetic conductive part 320, which is disposed in the mounting hole 110.

[0051] In this embodiment, the mounting hole 110 penetrates the bottom wall and top wall of the moving contact 100, and the second magnetic part 320 protrudes from the third magnetic part 330. Therefore, when the third magnetic part 330 is provided on the bottom side of the moving contact 100, the second magnetic part 320 can extend from the bottom side to the top side of the moving contact 100 along the mounting hole 110.

[0052] It should be noted that the top ends of the first magnetic conductive part 310 and the second magnetic conductive part 320 are usually flush with the top wall of the moving contact 100; of course, the top ends of the first magnetic conductive part 310 and the second magnetic conductive part 320 may be higher or lower than the top wall of the moving contact 100, which is not specifically limited here.

[0053] Furthermore, when there are multiple second magnetic conductive parts 320, there are also multiple mounting holes 110, with multiple second magnetic conductive parts 320 being disposed in multiple mounting holes 110 in a one-to-one correspondence.

[0054] In this embodiment, by distributing multiple second magnetic conductive parts 320 in multiple mounting holes 110, the second magnetic conductive part 300 is more stably mounted on the moving contact 100.

[0055] Furthermore, the number of second magnetic conductive parts 320 is one less than the number of first magnetic conductive elements 200, and the second magnetic conductive parts 320 correspond at least partially to two adjacent first magnetic conductive elements 200.

[0056] like Figures 1 to 4 As shown, there are two first magnetic conductive elements 200, which are spaced apart on the top side of the moving contact 100; correspondingly, there is one second magnetic conductive part 320, which corresponds to the bottom wall of the adjacent end of the two first magnetic conductive parts 310.

[0057] In other words, the second magnetic conductive part 320 is located between the two first magnetic conductive parts 310, the two first magnetic conductive parts 310 correspond to the opposite ends of the two first magnetic conductive elements 200 respectively, and the second magnetic conductive part 320 corresponds to the opposite ends of the two first magnetic conductive elements 200.

[0058] like Figure 5 and Figure 6 As shown, the number of first magnetic conductive elements 200 can also be three, with the three first magnetic conductive elements 200 spaced apart on the top side of the moving contact 100; correspondingly, the number of second magnetic conductive parts 320 is two.

[0059] Of course, in other embodiments of the present invention, the number of the first magnetic conductive element 200 can be other numbers, as long as it is guaranteed, and can be adjusted according to actual needs, and no specific limitation is made here.

[0060] It should be noted that when the number of first magnetic conductive parts 200 is greater than or equal to three, the number of corresponding second magnetic conductive parts 320 is greater than or equal to two. The first magnetic conductive parts 200 still form a magnetic conductive circuit with the first magnetic conductive parts 310 located on both sides of the moving contact 100 and the third magnetic conductive parts 330 located on the bottom side of the moving contact 100.

[0061] Furthermore, the distance between the top ends of two adjacent first magnetic conductors 200 is greater than the distance between their bottom ends.

[0062] In this embodiment, the distance between the top edges of the adjacent walls of two adjacent first magnetic conductive elements 200 is made greater than the distance between their bottom edges to appropriately increase the distance between the two first magnetic conductive elements 200, thereby reducing magnetic leakage.

[0063] In detail, such as Figure 4 As shown, the top ends of two adjacent first magnetic conductive elements 200 are provided with chamfers 210.

[0064] Specifically, the end face of the first magnetic conductor 200 is divided into an upper half and a lower half. The lower half of the end faces of two adjacent first magnetic conductors 200 are spaced at the same distance, while the upper half has a chamfered structure 210 so that the distance between the upper half of two adjacent first magnetic conductors 200 gradually decreases in the vertically downward direction.

[0065] In summary, the embodiments of the present invention provide a short-circuit resistant structure 10. By disposing at least two first magnetic conductive elements 200 on the top side of the moving contact 100 and a second magnetic conductive element 300 on the bottom side of the moving contact 100, and by extending at least a portion of the second magnetic conductive element 300 along the bottom side to the top side of the moving contact 100 to correspond to at least two first magnetic conductive elements 200 respectively, a magnetic circuit is formed between the first magnetic conductive elements 200 and the second magnetic conductive elements 300. The attraction between the magnetic pole surfaces of the first magnetic conductive elements 200 and the second magnetic conductive elements 300 resists the electrical repulsion, thereby forming a reliable electrical connection. This avoids the separation of the moving contact 100 and the stationary contact due to repulsion under abnormal circuit fault conditions such as abnormal current, ensuring stable contact between the moving contact 100 and the stationary contact. Therefore, it effectively improves the operational stability of the contact assembly and its ability to withstand short-circuit current.

[0066] Furthermore, this embodiment of the invention also provides a relay, including the short-circuit protection structure 10 described in the above embodiments.

[0067] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A short-circuit resistant structure, characterized in that, include: Moving contact (100); First magnetic conductive element (200), at least two first magnetic conductive elements (200) are spaced apart on the top side of the moving contact (100); The second magnetic conductive element (300) is disposed on the bottom side of the moving contact (100), and at least a portion of the second magnetic conductive element (300) extends from both sides and the middle of the moving contact (100) toward the first magnetic conductive element (200) to correspond to at least two of the first magnetic conductive elements (200) respectively, so as to form a magnetic conductive circuit together with at least two of the first magnetic conductive elements (200) when the moving contact (100) is energized.

2. The short-circuit protection structure according to claim 1, characterized in that, The second magnetic conductive element (300) includes a first magnetic conductive part (310), a second magnetic conductive part (320), and a third magnetic conductive part (330). The first magnetic conductive part (310) and the second magnetic conductive part (320) are both connected to the third magnetic conductive part (330), and the third magnetic conductive part (330) is disposed on the bottom side of the moving contact (100). The first magnetic conductive part (310) is disposed on both sides of the moving contact (100) and corresponds to at least a portion of the two first magnetic conductive elements (200) located at both ends respectively. The second magnetic conductive part (320) passes through the moving contact (100) and corresponds to at least a portion of the two adjacent first magnetic conductive elements (200).

3. The short-circuit protection structure according to claim 2, characterized in that, When the moving contact (100) is energized, the first magnetic conductive part (310), the third magnetic conductive part (330), and the two first magnetic conductive elements (200) together form a magnetic conductive circuit.

4. The short-circuit protection structure according to claim 1, characterized in that, A plurality of the first magnetic conductive elements (200) are equally spaced on the top side of the moving contact (100) in a direction perpendicular to the direction of current flow through the moving contact (100).

5. The short-circuit protection structure according to claim 2, characterized in that, The number of the second magnetic conductive parts (320) is one less than the number of the first magnetic conductive elements (200), and the second magnetic conductive parts (320) correspond to at least a portion of two adjacent first magnetic conductive elements (200).

6. The short-circuit protection structure according to claim 2, characterized in that, The moving contact (100) is provided with a mounting hole (110), and the shape of the mounting hole (110) is adapted to the shape of the second magnetic conductive part (320), which is disposed in the mounting hole (110).

7. The short-circuit protection structure according to claim 2, characterized in that, When the moving contact (100) is energized, the current also passes through the second magnetic conductive part (320).

8. The short-circuit protection structure according to claim 2, characterized in that, There are two first magnetic conductive parts (310) and one second magnetic conductive part (320). The second magnetic conductive part (320) is located between the two first magnetic conductive parts (310). The two first magnetic conductive parts (310) correspond to the opposite ends of the two first magnetic conductive elements (200), and the second magnetic conductive part (320) corresponds to the opposite ends of the two first magnetic conductive elements (200).

9. The short-circuit protection structure according to claim 1, characterized in that, The first magnetic conductive element (200) and the second magnetic conductive element (300) form a magnetic conductive circuit, and the first magnetic conductive element (200) and the second magnetic conductive element (300) include at least four attraction surfaces on the magnetic conductive circuit.

10. A relay, characterized in that, Including the short-circuit protection structure as described in any one of claims 1-9.

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