Relay

Abstract

The relay includes a fixed contact (12), a movable contact lead-out piece (21), a movable contact piece (22), and a movable contact (23). A movable contact (23) is provided on one end of the movable contact piece (22) on the side facing the fixed contact (12). The other end of the movable contact piece (22) is connected to the movable contact lead-out piece (21). When a short-circuit current flows, an electromagnetic repulsive force is generated between the movable contact piece (22) and the movable contact lead-out piece (21) to make the movable contact (23) contact the fixed contact (12). Between the connection position of the movable contact piece (22) and the movable contact lead-out piece (21) and the movable contact (23), the distance between at least a part of the movable contact lead-out piece (21) and the movable contact piece (22) is larger than the distance between the parts located on both sides of at least a part of the movable contact lead-out piece (21) and the movable contact piece (22), improving the use safety of the relay.

Description

Technical Field

[0001] [Cross - Reference to Related Applications] This disclosure claims the priority of Chinese Patent Application No. 202210929404.3, entitled "Relay", filed on August 3, 2022, and the entire content of the Chinese patent application is incorporated herein by reference.

[0002] [Technical Field] This disclosure relates to a relay.

Background Art

[0003] A relay is an automatic switch that plays a role in automatically turning on and off a circuit. In the prior art, in order to resist the repulsive force between contacts during a short - circuit current, when the movable contact piece and the movable contact lead - out piece are in a V - shaped structure, the current flowing through the movable contact piece and the current flowing through the movable contact lead - out piece are inevitably in opposite directions, and an electromagnetic repulsive force is generated between the movable contact piece and the movable contact lead - out piece. When the short - circuit current is large enough, the region of the movable contact piece corresponding to the large electromagnetic repulsive force deforms upward. Since the position of the fixed contact is relatively fixed, the head of the movable contact piece deforms downward. At this time, the movable contact and the fixed contact are displaced and the contact resistance changes, causing short - circuit instability. Also, when the head of the movable contact piece moves downward, the angle of the movable contact piece is more greatly compressed, the force transmitted to the push card increases, and in severe cases, the armature is pulled and the entire movement mechanism moves, the movable contact and the fixed contact bounce, causing an explosion, and the safety during use is low.

Summary of the Invention

Means for Solving the Problems

[0004] The relay provided by this disclosure reduces the deformation of the movable contact piece and improves the safety during use.

[0005] According to a first aspect of the present invention, a relay is provided, which includes a fixed contact and a movable contact assembly. The movable contact assembly includes a movable contact lead-out piece, a movable contact piece, and a movable contact. One end of the movable contact piece is provided with the movable contact on the side facing the fixed contact. The other end of the movable contact piece is connected to the movable contact lead-out piece. The movable contact piece is located between the fixed contact and the movable contact lead-out piece. When a short-circuit current flows, an electromagnetic repulsive force is generated between the movable contact piece and the movable contact lead-out piece, and the distance between at least a part of the movable contact lead-out piece and the movable contact piece is greater than the distance between the parts located on both sides of at least a part of the movable contact lead-out piece and the movable contact piece between the connection position of the movable contact lead-out piece and the movable contact and the movable contact.

[0006] According to an embodiment of the present disclosure, the movable contact piece and the movable contact lead-out piece form a V-shaped structure.

[0007] According to an embodiment of the present disclosure, the movable contact lead-out piece includes an intermediate section, a first connection section, and a second connection section. The intermediate section is provided between the connection position of the movable contact piece and the movable contact lead-out piece and the movable contact. The intermediate section is at least a part of the movable contact lead-out piece. The first connection section is connected to the other end of the movable contact piece. The second connection section and the first connection section are respectively arranged on both sides of the intermediate section. The position of the movable contact corresponds to the second connection section. The distance between the intermediate section and the closer side of the movable contact piece is d. The distance between the first connection section and the closer side of the movable contact piece is d1. The distance between the second connection section and the closer side of the movable contact piece is d2. Here, d>d1 and d>d2.

[0008] According to an embodiment of the present disclosure, the projection of the intermediate section on the movable contact piece does not overlap with the projection of the movable contact on the movable contact piece.

[0009] According to an embodiment of the present disclosure, the movable contact lead-out piece forms the intermediate section by being recessed in a direction away from the movable contact piece.

[0010] According to an embodiment of the present disclosure, the intermediate section is a groove having a structure with one end open, and the open end of the groove is arranged toward the movable contact piece.

[0011] According to an embodiment of the present disclosure, the portions of the movable contact lead-out piece where the groove is not provided are the first connection section and the second connection section.

[0012] According to an embodiment of the present disclosure, the groove wall of the groove has an arc-shaped structure or a linear structure, and / or the groove bottom of the groove has an arc-shaped structure or a linear structure.

[0013] According to an embodiment of the present disclosure, at least a part of one end of the movable contact lead-out piece close to the movable contact forms the second connection section by protruding in a direction approaching the movable contact piece.

[0014] According to an embodiment of the present disclosure, the second connection section includes a protrusion that protrudes in a direction approaching the movable contact piece and at the movable contact lead-out piece, and an intermediate section is formed between the side wall of the protrusion closer to the first connection section and the first connection section.

[0015] According to an embodiment of the present disclosure, the projection of the protrusion on the movable contact piece and the projection of the movable contact on the movable contact piece at least partially overlap.

[0016] According to an embodiment of the present disclosure, the projection of the protrusion on the movable contact piece and the projection of the movable contact on the movable contact piece completely overlap.

[0017] According to an embodiment of the present disclosure, among the projections of the protrusion on the movable contact piece, the portion exceeding the projection of the movable contact on the movable contact piece is located on one side of the movable contact close to the connection position between the movable contact piece and the movable contact lead-out piece.

[0018] One embodiment of the present disclosure has the following advantages or beneficial effects.

[0019] In the relay provided by the embodiment of the present disclosure, a movable contact is provided on one end of the movable contact piece on the side facing the fixed contact. That is, the movable contact is fixed to one end of the movable contact piece and corresponds to the fixed contact. The other end of the movable contact piece is connected to the movable contact lead-out piece, so that the movable contact piece and the movable contact lead-out piece are connected as an integral structure. When current flows, since the movable contact lead-out piece and the movable contact piece form a V shape, the current flowing through the movable contact lead-out piece and the current flowing through the movable contact piece are necessarily in opposite directions. At this time, an electromagnetic repulsive force is generated between the movable contact lead-out piece and the movable contact piece. By acting on the movable contact piece, the pressure between the movable contact and the fixed contact increases, realizing the short-circuit resistance function.

[0020] When a short circuit occurs, the current flowing through the movable contact lead-out piece reaches the caulking position between the movable contact piece and the movable contact lead-out piece, and then is transmitted to the movable contact through the movable contact piece. Since there may be current only between the caulking position of the movable contact piece and the movable contact, the region between the connection position of the movable contact piece and the movable contact lead-out piece and the movable contact can be made to coincide with the region where current may occur, thereby restricting the functional region of the movable contact piece. When a short-circuit current occurs, since the distance between at least a part of the movable contact lead-out piece and the movable contact piece is relatively large, the electromagnetic repulsive force between at least a part of the movable contact lead-out piece and the movable contact piece becomes relatively small, and since the amount of deformation of the movable contact lead-out piece in this region is relatively small, the purpose of reducing the upward deformation of the movable contact piece in this region is achieved. Since the distance between the portions located on both sides of at least a part of the movable contact lead-out piece and the movable contact piece is relatively small, the electromagnetic repulsive force between the portions located on both sides of at least a part of the movable contact lead-out piece and the movable contact piece becomes relatively large, and the amount of deformation of the movable contact lead-out piece in this region increases. At this time, the contact pressure between the movable contact and the fixed contact is relatively large, the risk of displacement between the movable contact and the fixed contact decreases, the possibility of explosion due to short-circuit instability decreases, and the safety of using the relay is improved.

Brief Description of the Drawings

[0021] The above and other features and advantages of the present invention will become more apparent by describing its exemplary embodiments in detail with reference to the drawings.

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Explanation of Reference Numerals

[0022] 1′, fixed contact assembly; 2′, movable contact assembly; 11′, fixed contact piece; 12′, fixed contact point; 21′, movable contact lead-out piece; 22′, movable contact piece; 23′, movable contact point; 1, fixed contact assembly; 2, movable contact assembly; 11, fixed contact piece; 12, fixed contact point; 21, movable contact lead-out piece; 22, movable contact piece; 23, movable contact point; 211, intermediate section; 2111, groove; 212, first connection section; 213, second connection section; 2131, protrusion; 100, base; 101, push card; 102, armature assembly; 103, coil; 104, yoke; 105, press block; 106, pin joint shaft; 107, socket hole, 108, press rod; 109, microswitch; 110, conductive plug terminal.

Mode for Carrying Out the Invention

[0023] Next, with reference to the drawings, exemplary embodiments will be described in more detail. However, the exemplary embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein. In this specification, relative terms such as "upper" and "lower" are used to describe the relative relationship between one component shown in the drawings and other components. These terms are used in this specification only for convenience, for example, in accordance with the exemplary directions shown in the drawings. It will be understood that if the device shown in the drawings is turned upside down, the component described as "upper" will become the "lower" component. Other relative terms such as "top" and "bottom" have the same meaning. When a structure is "above" another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

[0024] The terms "one", "a", "said", and "the" are used to indicate the presence of one or more elements / components, etc. The terms "comprising" and "having" are used to indicate an open-ended inclusion and mean that in addition to the listed elements / components, etc., there may be additional elements / components, etc. The terms "first", "second", etc. are used only as markers and are not used as quantitative limitations on the object.

[0025] This embodiment provides a relay. As shown in FIG. 1, the relay includes a contact portion. Here, the contact portion includes a movable contact assembly 2 and a fixed contact assembly 1. The fixed contact assembly 1 includes a rigid fixed contact piece 11 and a fixed contact point 12. The fixed contact point 12 is fixed to one end of the fixed contact piece 11, and the other end of the fixed contact piece 11 extends outside the base as a lead leg of the fixed contactor. The movable contact assembly 2 includes a rigid movable contact lead piece 21, a flexible movable contact piece 22, and a movable contact point 23. On one end of the movable contact piece 22, a movable contact point 23 is provided on the side facing the fixed contact point 12. The other end of the movable contact piece 22 is connected to the movable contact lead piece 21. The movable contact piece 22 is located between the fixed contact point 12 and the movable contact lead piece 21 and is used to generate an electromagnetic repulsive force between the movable contact piece 22 and the movable contact lead piece 21 when a short-circuit current flows. Among them, the movable contact piece 22 and the movable contact lead piece 21 form a V-shaped structure.

[0026] In the relay provided in this embodiment, on one end of the movable contact piece 22, a movable contact point 23 is provided on the side facing the fixed contact point 12. That is, the movable contact point 23 is fixed to one end of the movable contact piece 22 and corresponds to the fixed contact point 12. The other end of the movable contact piece 22 is connected to the movable contact lead piece 21, so that the movable contact piece 22 and the movable contact lead piece 21 are connected as an integral structure. When a current flows, since the movable contact lead piece 21 and the movable contact piece 22 form a V shape, the current flowing through the movable contact lead piece 21 and the current flowing through the movable contact piece 22 are necessarily in opposite directions. At this time, an electromagnetic repulsive force is generated between the movable contact lead piece 21 and the movable contact piece 22. By this electromagnetic repulsive force acting on the movable contact piece 22, the pressure between the movable contact point 23 and the fixed contact point 12 increases, realizing the short-circuit withstand function.

[0027] It should be noted that the other end of the movable contact piece 22 and the movable contact lead piece 21 can be fixed by a rivet or the like. For the convenience of description, the connection position between the other end of the movable contact piece 22 and the movable contact lead piece 21 is taken as the caulking position.

[0028] As shown in FIG. 2, the conventional fixed contact assembly 1' includes a fixed contact piece 11' and a fixed contact point 12'. The movable contact assembly 2' includes a movable contact lead-out piece 21', a movable contact piece 22', and a movable contact point 23'. The distance between the movable contact piece 22' and the movable contact lead-out piece 21' gradually increases in the direction of the movable contact point 23' from the caulking position. When the short-circuit current between the movable contact point 23' and the fixed contact point 12' is relatively small, for example, less than 6 KA, when a short-circuit current flows through the V-shaped movable contact piece 22' and the movable contact lead-out piece 21', the movable contact piece 22' deforms upward, and due to this deformation, the movable contact point 23' may be rubbed, and the adhesive force between the movable contact point 23' and the fixed contact point 12' decreases.

[0029] When the short-circuit current between the movable contact point 23' and the fixed contact point 12' is relatively large, for example, greater than 10 KA, the electromagnetic repulsive force between the movable contact point 23' and the fixed contact point 12' increases with the increase of the current. Since the distance between the side of the movable contact lead-out piece 21' near the caulking position and the movable contact piece 22' is relatively small, the electromagnetic repulsive force between the side of the movable contact lead-out piece 21' near the caulking position and the movable contact piece 22' is relatively large. Therefore, the movable contact lead-out piece 21' deforms upward relatively greatly in this region. Since the distance between the side of the movable contact lead-out piece 21' away from the caulking position and the movable contact piece 22' is relatively large, the electromagnetic repulsive force between the side of the movable contact lead-out piece 21' away from the caulking position and the movable contact piece 22' is relatively small. Since the positions of the movable contact point 23' and the fixed contact point 12' are fixed to each other, the movable contact lead-out piece 21' deforms downward in this region, and it is easy to cause a displacement between the movable contact point 23' and the fixed contact point 12', resulting in a change in contact resistance and causing short-circuit instability. In severe cases, an explosion may occur. Since one end of the movable contact piece 22' near the movable contact point 23' moves downward, the force transmitted to the push card increases. In severe cases, the armature is pulled, the entire movement mechanism moves, the movable contact and the fixed contact bounce, and an explosion occurs, affecting the performance of the relay. At this time, the middle part of the movable contact piece 22' deforms upward, and both ends of the movable contact piece 22' deform downward.

[0030] To solve this problem, in this embodiment, the structure of the movable contact lead piece 21 is optimized and improved. As shown in FIGS. 3 to 5, between the connection position of the movable contact piece 22 and the movable contact lead piece 21 and the movable contact 23, the distance between at least a part of the movable contact lead piece 21 and the movable contact piece 22 is greater than the distance between the parts located on both sides of at least a part of the movable contact lead piece 21 and the movable contact piece 22.

[0031] When a short circuit occurs, the current flowing through the movable contact lead piece 21 reaches the caulking position between the movable contact piece 22 and the movable contact lead piece 21 and is then transmitted to the movable contact 23 through the movable contact piece 22. For the movable contact piece 22, since current only flows between the caulking position of the movable contact piece 22 and the movable contact 23, the region between the connection position of the movable contact piece 22 and the movable contact lead piece 21 and the movable contact 23 can be made to coincide with the region where current may be generated, thereby restricting the functional region of the movable contact piece 22. When a short-circuit current occurs, because the distance between at least a part of the movable contact lead piece 21 and the movable contact piece 22 is relatively large, the electromagnetic repulsive force between at least a part of the movable contact lead piece 21 and the movable contact piece 22 becomes relatively small, and the amount of deformation of the movable contact lead piece 21 in this region is relatively small, achieving the purpose of reducing the upward deformation of the movable contact lead piece 21 in this region. Since the distance between the parts located on both sides of at least a part of the movable contact lead piece 21 and the movable contact piece 22 is relatively small, the electromagnetic repulsive force between the parts located on both sides of at least a part of the movable contact lead piece 21 and the movable contact piece 22 becomes relatively large, and the amount of deformation of the movable contact lead piece 21 in this region becomes relatively large. At this time, the contact pressure between the movable contact 23 and the fixed contact 12 is relatively large, the risk of displacement between the movable contact 23 and the fixed contact 12 is reduced, the possibility of explosion due to short-circuit instability is reduced, and the use safety of the relay is improved.

[0032] In one embodiment, as shown in FIGS. 6 to 9, the movable contact lead piece 21 includes an intermediate section 211, a first connection section 212, and a second connection section 213. The intermediate section 211 is provided between the connection position of the movable contact piece 22 and the movable contact lead piece 21 and the movable contact point 23. The first connection section 212 is connected to the other end of the movable contact piece 22. The second connection section 213 and the first connection section 212 are respectively arranged on both sides of the intermediate section 211, and the position of the movable contact point 23 corresponds to the second connection section 213. The distance between the intermediate section 211 and the side of the movable contact piece 22 close to each other is d, the distance between the first connection section 212 and the side of the movable contact piece 22 close to each other is d1, and the distance between the second connection section 213 and the side of the movable contact piece 22 close to each other is d2. Here, d>d1 and d>d2.

[0033] For the movable contact piece 22, since current can only exist between the caulking position of the movable contact piece 22 and the movable contact point 23, the intermediate section 211 is provided as at least a part of the movable contact lead piece 21 described above. The area covered by the intermediate section 211 can be made to coincide with the area where current may be generated, thereby restricting the functional area of the movable contact piece 22. The second connection section 213 and the first connection section 212 are respectively arranged on both sides of the intermediate section 211. The intermediate section 211 functions as an intermediate connection between the first connection section 212 and the second connection section 213, and the second connection section 213 and the first connection section 212 are substantially the portions located on both sides of the intermediate section 211. The first connection section 212 is connected to the other end of the movable contact piece 22 to realize the connection between the first connection section 212 and the movable contact piece 22. Here, the first connection section 212 and the movable contact piece 22 can be fixed using a rivet. Since there is only one fixed point position between the first connection section 212 and the movable contact piece 22, a V-shaped structure is formed between the movable contact piece 22 and the movable contact lead piece 21.

[0034] Regarding the distance between the movable contact lead piece 21 and the movable contact piece 22, the distance d between the intermediate section 211 and the closer side of the movable contact piece 22 is set to be larger than the distance d1 between the first connection section 212 and the closer side of the movable contact piece 22, and the distance d between the intermediate section 211 and the closer side of the movable contact piece 22 is set to be larger than the distance d2 between the second connection section 213 and the closer side of the movable contact piece 22. Since the distance between the intermediate section 211 and the movable contact piece 22 is relatively large, the electromagnetic repulsive force between the intermediate section 211 and the movable contact piece 22 is relatively small, and the deformation amount of the intermediate section 211 of the movable contact lead piece 21 is relatively small, which plays a role in reducing the upward deformation of the movable contact lead piece 21 between the movable contact 23 and the caulking position. Since the distance between the first connection section 212 and the movable contact piece 22 and the distance between the second connection section 213 and the movable contact piece 22 are relatively small, the electromagnetic repulsive force between the second connection section 213 and the movable contact piece 22 becomes relatively large, the deformation amount of the second connection section 213 is relatively large, and since the second connection section 213 and the movable contact 23 are arranged correspondingly, the contact pressure between the movable contact 23 and the fixed contact 12 becomes relatively large. At this time, it is equivalent to the movable contact 23 applying an upward contact pressure to the fixed contact 12, ensuring the contact stability between the movable contact 23 and the fixed contact 12 and improving the use safety of the relay. At the same time, since the electromagnetic repulsive force between the first connection section 212 and the movable contact piece 22 is relatively large, the deformation of the first connection section 212 becomes relatively large, but since the first connection section 212 and the movable contact piece 22 are fixed by a rivet, it can withstand a certain electromagnetic repulsive force.

[0035] Due to the combined action of the first connection section 212, the intermediate section 211, and the second connection section 213, when a large short-circuit current occurs, the movable contact piece 22 of the prior art has a structure in which the middle part deforms upward and both ends deform downward. However, according to this embodiment, the gap between the movable contact piece 22 and the intermediate section 211 becomes larger, the repulsive force becomes smaller, and the upward deformation amount becomes smaller. Therefore, the amplitude downward at both ends also becomes smaller, effectively changing the deformation direction of the movable contact piece 22 and reducing the mutual separation of the movable contact 23 and the fixed contact 12 in the case of a large short circuit can be understood.

[0036] It can be understood that the first connection section 212, the intermediate section 211, and the second connection section 213 are of an integral structure, shortening the manufacturing and assembly time of multiple parts and saving manufacturing costs.

[0037] In one embodiment, as shown in FIGS. 6 to 9, the projection of the intermediate section 211 on the movable contact piece 22 does not overlap the projection of the movable contact 23 on the movable contact piece 22.

[0038] When the projection of the intermediate section 211 on the movable contact piece 22 overlaps the projection of the movable contact 23 on the movable contact piece 22, in other words, the movable contact 23 and the intermediate section 211 are arranged opposite to each other, and since the distance between the intermediate section 211 and the movable contact piece 22 is relatively large, the electromagnetic repulsive force between the two is relatively small, and the contact pressure of the movable contact 23 against the fixed contact 12 is relatively small. As a result, there is a risk that the movable contact 23 and the fixed contact 12 will separate from each other. For this reason, the intermediate section 211 and the movable contact 23 are arranged offset from each other so that the projection of the intermediate section 211 on the movable contact piece 22 does not overlap the projection of the movable contact 23 on the movable contact piece 22. Thereby, the relatively small electromagnetic repulsive force between the intermediate section 211 and the movable contact piece 22 does not act on the portion corresponding to the movable contact 23 of the movable contact piece 22, avoiding the situation where the contact pressure of the movable contact 23 against the fixed contact 12 becomes relatively small when the short-circuit current is large, and ensuring the stability of the mutual contact between the movable contact 23 and the fixed contact 12.

[0039] In one embodiment, the movable contact lead piece 21 is recessed in a direction away from the movable contact piece 22 to form an intermediate section 211.

[0040] The distance between the existing movable contact lead piece 21 and the movable contact piece 22 corresponds to the distance between the opposing side walls of the V-shaped structure. In order to ensure a relatively large distance between the intermediate section 211 and the movable contact piece 22, the movable contact lead piece 21 is recessed in a direction away from the movable contact piece 22 to achieve the purpose of increasing the distance between the movable contact lead piece 21 and the movable contact piece 22. When forming the intermediate section 211 by means of the depression, the structure is simple, the process is simple and convenient, and the manufacturing cost is relatively low.

[0041] In one embodiment, the intermediate section 211 is a groove 2111 with one end open, and the open end of the groove 2111 is arranged facing the movable contact piece 22.

[0042] The depression corresponds to a sunken structure. Compared with the case where there is no groove 2111, at least the distance between the groove bottom of the groove 2111 and the corresponding portion of the movable contact piece 22 is increased, which plays a role in changing the local structure of the movable contact lead piece 21. The electromagnetic repulsive force between the groove bottom of the groove 2111 and the movable contact piece 22 becomes relatively small, and the deformation amount of the movable contact piece 22 in the region corresponding to the intermediate section 211 is reduced.

[0043] In one embodiment, the portions of the movable contact lead piece 21 where the groove 2111 is not provided are the first connection section 212 and the second connection section 213.

[0044] It can be understood that the portions of the movable contact lead piece 21 where the groove 2111 is not provided are the portions on both sides of the groove 2111, and these two portions can be directly used as the first connection section 212 and the second connection section 213. That is, when the intermediate section 211 is processed, the first connection section 212 and the second connection section 213 are simultaneously and naturally formed by production and manufacturing, so the process is simple and the manufacturing cost is relatively low.

[0045] In one embodiment, the groove wall of the groove 2111 has an arc-shaped structure or a linear structure, and / or the groove bottom of the groove 2111 has an arc-shaped structure or a linear structure.

[0046] As shown in FIGS. 6 to 9, if the groove wall of the groove 2111 has a linear structure and / or the groove bottom of the groove 2111 has a linear structure, at least a part of the inner wall of the groove 2111 has an angular structure. If both the groove wall and the groove bottom of the groove 2111 have a linear structure, the groove 2111 may specifically be a rectangular groove or a trapezoidal groove. As shown in FIGS. 10 to 15, if the groove wall of the groove 2111 has an arc-shaped structure and / or the groove bottom of the groove 2111 has an arc-shaped structure, the arc-shaped structure plays a role in smooth transition. If both the groove wall and the groove bottom of the groove 2111 have an arc-shaped structure, the groove 2111 may specifically be a groove 2111 having a semi-circular structure.

[0047] It should be noted that if the side wall of the groove 2111 is parallel to the movable contact piece 22, the groove 2111 cannot be formed. If the side wall of the groove 2111 is inclined with respect to the movable contact piece 22, the side wall of the groove 2111 plays a role in widening the distance between the groove 2111 and the movable contact piece 22, and the distance between the groove bottom of the groove 2111 and the movable contact piece 22 becomes the largest. At this time, both the side wall and the bottom wall of the groove 2111 play a role in widening the interval to a certain extent. If the side wall of the groove 2111 is arranged perpendicular to the movable contact piece 22, the side wall of the groove 2111 and the movable contact piece 22 are relatively small, and the direction of the current is perpendicular, there is a possibility that it only plays a role in increasing the distance between the groove bottom of the groove 2111 and the movable contact piece 22.

[0048] In one embodiment, as shown in FIGS. 16 to 19, at least a part of one end of the movable contact lead-out piece 21 close to the movable contact 23 projects in the direction approaching the movable contact piece 22 to form a second connection section 213.

[0049] In order to reduce the amount and direction of deformation of the movable contact piece 22, in addition to increasing the distance between the intermediate section 211 and the movable contact piece 22, it can be understood that a method of reducing the distance between the second connection section 213 and the movable contact piece 22 can also be adopted. Therefore, at least a part of one end of the movable contact lead-out piece 21 close to the movable contact 23 is protruded in a direction approaching the movable contact piece 22 to form the second connection section 213. This corresponds to reducing the distance between the second connection section 213 and the movable contact piece 22. According to the principle that the electromagnetic repulsive force increases when the distance is small, the electromagnetic repulsive force between the second connection section 213 and the movable contact piece 22 becomes relatively large. Since the positions of the second connection section 213 and the movable contact 23 are correspondingly set, the second connection section 213 can apply a large upward contact pressure to the movable contact 23, ensuring the contact stability between the movable contact 23 and the fixed contact 12. The method of forming the second connection section 213 by protruding has a simple structure, a simple process, and a relatively low manufacturing cost.

[0050] In one embodiment, the second connection section 213 includes a protrusion 2131 that protrudes in a direction approaching the movable contact piece 22 and with respect to the movable contact lead-out piece 21. An intermediate section 211 is formed between the side wall of the protrusion 2131 closer to the first connection section 212 and the first connection section 212.

[0051] The upper wall of the protrusion 2131 is the closest position between the protrusion 2131 and the movable contact piece 22. It can be understood that the distance between the side wall of the protrusion 2131 and the movable contact piece 22 tends to gradually increase. An intermediate section 211 is formed between the side wall of the protrusion 2131 closer to the first connection section 212 and the first connection section 212, which corresponds to forming the intermediate section 211 by borrowing the space between the side wall of the protrusion 2131 and the first connection section 212. Since the distance between the side wall of the protrusion 2131 and the movable contact piece 22 gradually increases, the distance between the intermediate section 211 and the movable contact piece 22 can be ensured to be relatively large.

[0052] In one embodiment, as shown in FIGS. 16 to 19, the projection of the protrusion 2131 on the movable contact piece 22 and the projection of the movable contact 23 on the movable contact piece 22 overlap at least partially.

[0053] The protrusion 2131 is provided opposite to the movable contact 23. That is, the closest position between the second connection section 213 and the movable contact piece 22 corresponds to the movable contact 23, which is equivalent to an increase in bending of the movable contact lead piece 21 in the vicinity of the movable contact 23, strengthening the electromagnetic force in the vicinity of the movable contact 23 and increasing the local electromagnetic repulsive force, thereby preventing the repulsion of the movable contact 23 by the short-circuit current, and ensuring that a larger electromagnetic repulsive force is directly converted into the upward contact pressure of the movable contact 23 against the fixed contact 12, realizing the function of tightly coupling the movable contact 23 and the fixed contact 12.

[0054] In one embodiment, the projection of the protrusion 2131 on the movable contact piece 22 completely overlaps the projection of the movable contact 23 on the movable contact piece 22.

[0055] The protrusion 2131 and the movable contact 23 are completely opposite to each other, and the central axis of the protrusion 2131 and the central axis of the movable contact 23 are on the same straight line, so as to ensure the correspondence and alignment effect between the protrusion and the movable contact 23, and ensure that a larger electromagnetic repulsive force is directly converted into the upward contact pressure of the movable contact 23 against the fixed contact 12.

[0056] In one embodiment, among the projections of the protrusion 2131 on the movable contact piece 22, the portion exceeding the projection of the movable contact 23 on the movable contact piece 22 is located on the side closer to the connection position of the movable contact 23 between the movable contact piece 22 and the movable contact lead piece 21.

[0057] When a short circuit occurs, after the current flowing through the movable contact lead piece 21 reaches the caulked position between the movable contact piece 22 and the movable contact lead piece 21, the current is transmitted to the movable contact piece 22 through the movable contact piece 22. For the movable contact piece 22, since current can only exist between the caulked position of the movable contact piece 22 and the movable contact point 23, no current will flow through one side of the movable contact piece 22 that is away from the caulked position corresponding to the movable contact point 23. That is, the movable contact piece 22 is an ineffective area where there is no electromagnetic repulsive force between the left side region with the movable contact point 23 as the boundary and the movable contact lead piece 21. Among the projections of the protrusion 2131 on the movable contact piece 22, the part that exceeds the projection of the movable contact point 23 on the movable contact piece 22 is located on one side of the movable contact point 23 close to the connection position between the movable contact piece 22 and the movable contact lead piece 21. That is, although the central axis of the protrusion 2131 can be offset with respect to the central axis of the movable contact point 23, since the central axis of the protrusion 2131 is offset to the right with respect to the central axis of the movable contact point 23, it is ensured that the protrusion 2131 bends upward in the current flow path, and an electromagnetic repulsive force is surely generated between the right side region of the movable contact piece 22 with the movable contact point 23 as the boundary and the movable contact lead piece 21, ensuring the effectiveness of reducing the interval at the location where the movable contact point 23 is located.

[0058] As shown in FIG. 1, the relay provided in this embodiment further includes an insulating case and a microswitch 109. The insulating case is composed of a base 100 and a cover (not shown) fixedly connected by snap fitting. Both the base 100 and the cover are made by injection molding of plastic materials. The base 100 is mounted with a magnetic circuit system and two push cards 101. The magnetic circuit system includes an armature assembly 102, a coil 103 and a yoke 104. The yoke 104 is fixedly connected to the coil bobbin, and the coil 103 and the yoke 104 are fixed on one side of the base 100. The middle part of the armature assembly 102 is pivotally connected to the base 100 and is adjacent to the coil 103. The centers of the upper end and the lower end of the armature assembly 102 both extend outward with a single pin joint shaft 106. The central axes of the two pin joint shafts 106 overlap. Here, one pin joint shaft 106 is inserted into a pin joint hole (not shown) of the base 100, and the other pin joint shaft 106 cooperates with the socket hole 107 of the press block 105. Both ends of the press block 105 are fixedly connected to the base 100.

[0059] When a forward pulse voltage is connected to the relay coil 103, the magnetic circuit system operates, the armature assembly 102 drives the push card 101, and when the push card 101 pushes and moves the movable contact piece 22, the movable contact 23 contacts the fixed contact 12, the relay is in a contact state, the press rod 108 loosens the microswitch 109 and contacts the movable contact piece 22, the microswitch 109 is reset and does not move, and the microswitch 109 also transmits one of its states to the outside through the conductive plug terminal 110. When a reverse pulse voltage is connected to the relay coil 103, the magnetic circuit system operates again, the armature assembly 102 drives the push card 101 to return, the push card 101 pulls and returns the movable contact piece 22, the movable contact 23 separates from the fixed contact 12, the contact opens, the relay is in an open state, the press rod 108 presses the microswitch 109 and contacts the movable contact piece 22, whereby the microswitch 109 operates and the microswitch 109 transmits another state to the outside through the conductive plug terminal 110. Thus, by judging the state of the microswitch 109, the operating state of the relay can be easily judged.

[0060] It should be understood that the present disclosure is not limited in its application to the detailed structure and arrangement of the components described herein. The present disclosure allows for other embodiments and can be implemented and carried out in various ways. The foregoing modifications and variations are included within the scope of the present disclosure. It will be understood that the present disclosure as disclosed and limited herein extends to all alternative combinations of two or more distinct features mentioned or apparent in the text and / or drawings. All of these different combinations constitute multiple alternative aspects of the present disclosure. The embodiments described herein illustrate the best known mode of carrying out the invention and are intended to enable those skilled in the art to utilize the invention.

Claims

1. Comprising a fixed contact (12) and a movable contact assembly (2), The movable contact assembly (2) includes a movable contact lead-out piece (21), a movable contact piece (22), and a movable contact (23). One end of the movable contact piece (22) is provided with the movable contact (23) on the side facing the fixed contact (12). The other end of the movable contact piece (22) is connected to the movable contact lead-out piece (21). The movable contact piece (22) is located between the fixed contact (12) and the movable contact lead-out piece (21). When a short-circuit current flows, an electromagnetic repulsive force is generated between the movable contact piece (22) and the movable contact lead-out piece (21) to make the movable contact (23) abut against the fixed contact (12), Between the connection position of the movable contact piece (22) and the movable contact lead-out piece (21) and the movable contact (23), the distance between at least a part of the movable contact lead-out piece (21) and the movable contact piece (22) is greater than the distance between the parts located on both sides of at least a part of the movable contact lead-out piece (21) and the movable contact piece (22). A relay characterized by the above.

2. The movable contact piece (22) and the movable contact lead-out piece (21) form a V-shaped structure. The relay according to claim 1, characterized by the above.

3. The movable contact lead-out piece (21) includes an intermediate section (211), a first connection section (212), and a second connection section (213). The intermediate section (211) is at least a part of the movable contact lead-out piece (21) and is provided between the connection position of the movable contact piece (22) and the movable contact lead-out piece (21) and the movable contact (23). The first connection section (212) is connected to one end of the movable contact piece (22). The second connection section (213) and the first connection section (212) are respectively arranged on both sides of the intermediate section (211). The position of the movable contact (23) corresponds to the second connection section (213). The distance between the intermediate section (211) and the side of the movable contact piece (22) close to each other is d, the distance between the first connection section (212) and the side of the movable contact piece (22) close to each other is d1, and the distance between the second connection section (213) and the side of the movable contact piece (22) close to each other is d2. Here, d > d1 and d > d2. The relay according to claim 1, characterized by the above. Claim 4 The projection of the intermediate section (211) on the movable contact piece (22) does not overlap with the projection of the movable contact point (23) on the movable contact piece (22). The relay according to claim 3, characterized in that. Claim 5 The movable contact lead-out piece (21) is recessed in a direction away from the movable contact piece (22) to form the intermediate section (211). The relay according to claim 3 or 4, characterized in that. Claim 6 The intermediate section (211) is a groove (2111) with one end open, and the open end of the groove (2111) is arranged facing the movable contact piece (22). The relay according to claim 5, characterized in that. Claim 7 The portions of the movable contact lead-out piece (21) where the groove (2111) is not provided are the first connection section (212) and the second connection section (213). The relay according to claim 6, characterized in that. Claim 8 The groove wall of the groove (2111) has an arc-shaped structure or a linear structure, and / or The groove bottom of the groove (2111) has an arc-shaped structure or a linear structure The relay according to claim 6, characterized in that. Claim 9 At least a part of one end of the movable contact lead-out piece (21) close to the movable contact point (23) protrudes in a direction approaching the movable contact piece (22) to form the second connection section (213). The relay according to claim 3 or 4, characterized in that. Claim 10 The second connection section (213) includes a protrusion (2131) that protrudes in a direction approaching the movable contact piece (22) and with respect to the movable contact lead-out piece (21). An intermediate section (211) is formed between the side wall of the protrusion (2131) on the side close to the first connection section (212) and the first connection section (212). The relay according to claim 9, characterized in that. Claim 11 The projection of the protrusion (2131) on the movable contact piece (22) and the projection of the movable contact point (23) on the movable contact piece (22) at least partially overlap. The relay according to claim 10, characterized in that. Claim 12 The projection of the protrusion (2131) on the movable contact piece (22) and the projection of the movable contact point (23) on the movable contact piece (22) completely overlap. The relay according to claim 11, characterized in that. Claim 13 Among the projections of the protrusion (2131) on the movable contact piece (22), the portion that exceeds the projection of the movable contact (23) on the movable contact piece (22) is located on the side closer to the connection position of the movable contact (23) between the movable contact piece (22) and the movable contact lead-out piece (21). The relay according to claim 11, characterized in that.

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