Relay

Abstract

To provide an improved relay.SOLUTION: The relay includes a pair of fixed contact lead-out ends, a plurality of movable contact points, and a short-circuit-proof structure. Both ends of each movable contact point along a first direction are for contacting or separating from a pair of fixed contact lead-out ends. The first direction is the arrangement direction of the pair of fixed contact lead-out ends. A contact gap between at least one of the multiple movable contact points and the fixed contact lead-out ends among the multiple movable contact points is smaller than a contact gap between the remaining movable contact points and the fixed contact lead-out ends. The short-circuit-proof structure is configured to form a suction force in the contact closure direction for the multiple movable contact points. The suction force applied to the movable contact points with the small contact gap is smaller than the suction force applied to each of the remaining movable contact points.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present application relates to the technical field of electronic control elements, and in particular to relays. [Background technology]

[0002] A relay is an electronic control element that has a control system (also called input circuit) and a controlled system (also called output circuit), and is usually applied in automatic control circuits. A relay is actually an "automatic switch" that controls a large current with a small current. Therefore, in the circuit, it plays the role of automatic adjustment, safety protection, conversion circuit, etc.

[0003] A high voltage DC relay is a type of relay, and in order to solve the problem that the contact of the high voltage DC relay is popped due to the electromotive repulsive force caused by the short circuit current, a short circuit resistant structure is usually provided in the related art. However, since there is a negative correlation between the short circuit resistance and the interrupting ability, the interrupting ability will be reduced. Therefore, it is necessary to further optimize the structure of the relay in the related art. Summary of the Invention

[0004] SUMMARY OF THE DISCLOSURE In order to solve the problems existing in the related art, the embodiments of the present application provide a relay that can not only realize limit interruption between contacts, but also realize delayed interruption of the contacts.

[0005] The relay according to the embodiment of the present application includes a pair of fixed contact lead ends, a plurality of movable contacts, and a short-circuit resistant structure. Both ends of each movable contact along a first direction are for contacting or separating from a pair of the fixed contact pull-out ends, the first direction is an arrangement direction of the pair of the fixed contact pull-out ends, and a contact gap between at least one of the movable contacts and the fixed contact pull-out ends is smaller than a contact gap between the remaining movable contacts and the fixed contact pull-out ends; The short-circuit resistant structure is configured to generate an attractive force on the multiple movable contacts in a contact closing direction, and the attractive force applied to the movable contact having a smaller contact gap is smaller than the attractive force applied to each of the remaining movable contacts.

[0006] According to some embodiments of the present application, the short-circuit resistant structure includes a first magnetic conductive body and at least one second magnetic conductive body; The first magnetic conductive body is provided on one side of the movable contacts toward the fixed contact pull-out ends, and the first magnetic conductive body at least partially overlaps each of the movable contacts along a contact closing direction; Of the multiple movable contactors, each of the remaining movable contactors, except for the movable contactor having a small contact gap, has one second magnetic body fixedly connected to one side facing the fixed contact pull-out end, and the first magnetic body is configured to form a magnetic circuit with at least one of the second magnetic bodies.

[0007] According to some embodiments of the present application, the relay further includes a contact container, the contact container is provided with a pair of first through holes, the pair of fixed contact lead ends are respectively drilled into the pair of first through holes, and the plurality of movable contacts are provided in the contact container; The first magnetic conductive body is provided within the contact vessel and is fixedly provided with respect to the contact vessel.

[0008] According to some embodiments of the present application, the contact vessel includes a yoke plate and an insulating cover; The insulating cover covers one side surface of the yoke plate, the insulating cover is provided with a pair of the first through holes, and the first magnetic conductive body is connected to the insulating cover via a connecting member.

[0009] According to some embodiments of the present application, the insulating cover is provided with a third through hole, The connecting member is rod-shaped and is inserted into the third through-hole, with one end of the connecting member being connected to the insulating cover and the other end being connected to the first magnetic conductive body.

[0010] According to some embodiments of the present application, the insulating cover includes a ceramic cover and a flange member, and the ceramic cover is connected to the yoke plate via the flange member. The ceramic cover is provided with a pair of the first through holes, and the first magnetic conductive body is connected to the ceramic cover via the connecting member.

[0011] According to some embodiments of the present application, the short-circuit resistant structure includes at least one first magnetic body and at least one second magnetic body; At least one first magnetic conductive body is provided on one side of the plurality of movable contacts toward the fixed contact pull-out ends, and the number and position of the at least one first magnetic conductive body along a contact closing direction respectively correspond to the number and position of the remaining movable contacts; Of the multiple movable contactors, each of the remaining movable contactors, except for the movable contactor having a small contact gap, has one second magnetic body fixedly connected to one side facing the fixed contact pull-out end, and the corresponding first magnetic body and second magnetic body are configured to form a magnetic circuit.

[0012] According to some embodiments of the present application, the relay further comprises a push rod assembly, the plurality of movable contacts are attached to the push rod assembly via a resilient assembly, the resilient assembly configured to provide a contact pressure to the plurality of movable contacts; At least one of the first magnetic conductive bodies is attached to the push rod assembly.

[0013] According to some embodiments of the present application, a moving direction of the movable contact is defined as a second direction, the push rod assembly includes a push rod and a contact bracket; the contact bracket includes a top wall and two side walls, one ends of the two side walls are respectively connected to both sides of the top wall along a third direction, and the other ends of the two side walls are respectively connected to the push rod, and the first direction, the second direction, and the third direction are perpendicular to each other; At least one of the first magnetic conductive bodies is connected to the top wall.

[0014] According to some embodiments of the present application, the top wall includes a first section, a second section, and a bent section, the bent section is connected to the first section and is bent in a direction away from the push rod to be connected to the second section, and one ends of the two side walls are respectively connected to the first section and the second section; At least one of the first magnetic bodies is connected to a surface of one side of the second section facing the push rod, and the surface of the at least one of the first magnetic bodies facing the push rod is flush with the surface of the first section facing the push rod.

[0015] According to some embodiments of the present application, the attractive force on the movable contact with a small contact gap is zero.

[0016] According to some embodiments of the present application, the short-circuit resistant structure includes at least one first magnetic conductive body; Of the plurality of movable contacts, each of the remaining movable contacts, except for the movable contacts having a small contact gap, is provided with one of the first magnetic bodies on one side facing the fixed contact drawn-out end.

[0017] According to some embodiments of the present application, the plurality of movable contacts are arranged side by side along a third direction, The moving direction of the movable contact is defined as a second direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0018] According to some embodiments of the present application, the short-circuit resistant structure includes a first magnetic body and a plurality of second magnetic bodies; The first magnetic conductive body is provided on one side of the plurality of movable contacts toward the fixed contact pull-out ends, and the first magnetic conductive body at least partially overlaps each of the movable contacts along a contact closing direction; One of the second magnetic bodies is fixedly connected to one side of each of the multiple movable contacts facing away from the fixed contact pull-out end, and the first magnetic body is configured to form a magnetic circuit with the multiple second magnetic bodies, and the thickness of the second magnetic body connected to the movable contact having a smaller contact gap among the multiple second magnetic bodies is thinner than the thickness of the other second magnetic bodies.

[0019] According to some embodiments of the present application, the short-circuit resistant structure includes a plurality of first magnetic bodies and a plurality of second magnetic bodies; a plurality of first magnetic conductive bodies are provided on one side of the plurality of movable contacts toward the fixed contact drawn-out ends, and the number and positions of the plurality of first magnetic conductive bodies along a contact closing direction respectively correspond to the number and positions of the movable contacts; One of the second magnetic bodies is fixedly connected to each of the multiple movable contacts on one side facing the fixed contact pull-out end, and the multiple first magnetic bodies are configured to form a magnetic circuit with the multiple second magnetic bodies, and the thickness of the second magnetic body connected to the movable contact having a smaller contact gap among the multiple second magnetic bodies is thinner than the thickness of the other second magnetic bodies.

[0020] The relay according to the embodiment of the present application includes a pair of fixed contact lead ends, a plurality of movable contacts, and a short-circuit resistant structure. Both ends of each movable contact along a first direction are for contacting or separating from a pair of the fixed contact pull-out ends, the first direction is an arrangement direction of the pair of the fixed contact pull-out ends, and contact gaps between each of the movable contacts and the fixed contact pull-out ends are equal; The short-circuit resistant structure is configured to generate an attractive force on the multiple movable contacts in a contact closing direction, and the attractive force applied to at least one of the multiple movable contacts is smaller than the attractive force applied to the remaining movable contacts.

[0021] According to some embodiments of the present application, the short-circuit resistant structure includes a first magnetic conductive body and at least one second magnetic conductive body; The first magnetic conductive body is provided on one side of the plurality of movable contacts toward the fixed contact pull-out ends, and the first magnetic conductive body at least partially overlaps each of the movable contacts along a contact closing direction; Of the multiple movable contactors, each of the remaining movable contactors, except for the movable contactor with the smallest attractive force, has one second magnetic body fixedly connected to one side facing the fixed contact pull-out end, and the first magnetic body is configured to form a magnetic circuit with at least one of the second magnetic bodies.

[0022] According to some embodiments of the present application, the short-circuit resistant structure includes at least one first magnetic body and at least one second magnetic body; At least one first magnetic conductive body is provided on one side of the plurality of movable contacts toward the fixed contact pull-out ends, and the number and position of the at least one first magnetic conductive body along a contact closing direction respectively correspond to the number and position of the remaining movable contacts; Of the multiple movable contactors, each of the remaining movable contactors, except for the movable contactor with the smallest attractive force, has one second magnetic body fixedly connected to one side facing the fixed contact pull-out end, and the corresponding first magnetic body and second magnetic body are configured to form a magnetic circuit.

[0023] According to some embodiments of the present application, the attractive force on one of the movable contacts is zero.

[0024] According to some embodiments of the present application, the short-circuit resistant structure includes at least one first magnetic conductive body; Of the plurality of movable contacts, each of the remaining movable contacts, except for the movable contacts having a small attractive force, is provided with one of the first magnetic bodies on one side facing the fixed contact drawn-out end.

[0025] According to some embodiments of the present application, the plurality of movable contacts are arranged side by side along a third direction, The moving direction of the movable contact is defined as a second direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0026] According to some embodiments of the present application, the short-circuit resistant structure includes a first magnetic body and a plurality of second magnetic bodies; The first magnetic conductive body is provided on one side of the movable contacts toward the fixed contact pull-out ends, and the first magnetic conductive body at least partially overlaps each of the movable contacts along a contact closing direction; One of the second magnetic bodies is fixedly connected to one side of each of the multiple movable contactors facing away from the fixed contact pull-out end, and the first magnetic body is configured to form a magnetic circuit with the multiple second magnetic bodies, and the thickness of the second magnetic body connected to the movable contactor having a smaller attractive force among the multiple second magnetic bodies is thinner than the thickness of the other second magnetic bodies.

[0027] According to some embodiments of the present application, the short-circuit resistant structure includes a plurality of first magnetic bodies and a plurality of second magnetic bodies; a plurality of first magnetic conductive bodies are provided on one side of the plurality of movable contacts toward the fixed contact drawn-out ends, and the number and positions of the plurality of first magnetic conductive bodies along a contact closing direction correspond to the number and positions of the movable contacts, respectively; One of the second magnetic bodies is fixedly connected to one side of each of the multiple movable contacts facing away from the fixed contact pull-out end, and the multiple first magnetic bodies are configured to form a magnetic circuit with the multiple second magnetic bodies, and the thickness of the second magnetic body connected to the movable contactor having a smaller attractive force among the multiple second magnetic bodies is thinner than the thickness of the other second magnetic bodies.

[0028] One embodiment of the above application has at least the following advantages or beneficial effects.

[0029] In the relay of the embodiment of the present application, during the limit breaking process, on the one hand, the multiple movable contacts form a parallel circuit to achieve a shunt effect, so that the current value flowing through each movable contact is small, which is beneficial to the breaking of the movable contact and the fixed contact. On the other hand, the movable contact with the small contact gap breaks later than the remaining movable contacts, so that even after the remaining movable contacts break, the movable contact with the small contact gap is still in contact with the fixed contact lead end. In addition, the attractive force applied to the movable contact with the small contact gap is smaller than that applied to the remaining movable contacts, so when the movable contact with the small contact gap breaks, there is no need to resist the attractive force of the short-circuit-resistant structure, or the attractive force to be resisted is very small, which is also beneficial to the breaking of the entire relay. When a short circuit current flows, the attraction force of the short circuit resistant structure on the movable contact with the small contact gap is smaller than that on the remaining movable contacts, so that the movable contact with the small contact gap is preferentially repelled by the electric repulsive force between the contacts, and at this time, the current of the remaining movable contact increases, and the instantaneous attraction force of the short circuit resistant structure also increases instantaneously, improving the short circuit resistance, so that the attraction force on the remaining movable contact plays the role of delaying the disconnection, and the reaction time for the short circuit disconnection of the entire circuit can be won. Therefore, the relay of the embodiment of the present application is not only useful for realizing the limit disconnection between the contacts, but also can realize the delayed disconnection of the contacts when a short circuit occurs, ensuring the reliability of the relay operation and prolonging the life of the product. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is an exploded schematic diagram of a relay in accordance with an exemplary embodiment. [Diagram 2] FIG. 2 is a schematic top view of a sealing unit according to a first exemplary embodiment. [Diagram 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. [Figure 4]FIG. 4 is an exploded schematic view of the seal unit according to the first exemplary embodiment. [Diagram 5] FIG. 5 is a schematic diagram illustrating unequal contact gaps between two movable contacts and a fixed contact lead end according to an exemplary embodiment. [Figure 6] FIG. 6 is a schematic diagram illustrating unequal contact gaps between two movable contacts and a fixed contact lead end according to another exemplary embodiment. [Figure 7] FIG. 7 is a schematic diagram illustrating one of the two movable contacts touching the fixed contact lead end and the other movable contact not yet touching, according to an exemplary embodiment. [Figure 8] FIG. 8 is a schematic diagram illustrating two movable contacts contacting a fixed contact lead end according to an exemplary embodiment. [Figure 9] FIG. 9 shows schematic diagrams of a short-circuit resistant structure and multiple movable contacts according to four different embodiments. [Figure 10] FIG. 10 shows schematic diagrams of a short-circuit resistant structure and multiple movable contacts according to four different embodiments. [Figure 11] FIG. 11 shows schematic diagrams of a short-circuit resistant structure and multiple movable contacts according to four different embodiments. [Figure 12] FIG. 12 shows schematic diagrams of a short-circuit resistant structure and multiple movable contacts according to four different embodiments. [Figure 13] FIG. 13 is a schematic top view of a sealing unit according to a second exemplary embodiment. [Figure 14] FIG. 14 is a cross-sectional view taken along line BB in FIG. [Figure 15] FIG. 15 is an exploded schematic view of a seal unit according to the second exemplary embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] [Explanation of symbols] 1, relay; 10, housing; 11, first case; 11a, exposure hole; 12, second case; 20, coil unit; 21, coil bobbin; 22, coil; 30, arc-extinguishing unit; 31, arc-extinguishing magnet; 32, yoke clamp; 40, seal unit; 1000, contact container; 1001, contact chamber; 1002, first through hole; 1100, insulating cover; 1110, ceramic cover; 1111, third through hole; 1120, flange member; 1200, yoke plate; 1210, second through hole; 2000, fixed contact lead end; 2001, convex portion; 2002, groove portion; 3000, movable assembly; 3110, movable contact; 3200, push rod head assembly; 3210, push rod; 3211, base; 3212, rod portion; 3213, locking sheet; 3220, contact bracket; 3221, top wall; 3221a, first section; 3221b, second section; 3221c, folded section; 3222, side wall; 3223, locking hole; 3300, elastic assembly; 4000, magnetic circuit portion; 4300, fixed core; 4310, through hole; 4400, movable core; 4500, reset member; 5000, metal cover; 6000, short circuit resistant structure; 6100, first magnetic body; 6200, second magnetic body; 100, first movable contact; 200, second movable contact; 300, connecting member

[0032] Next, exemplary embodiments will be described in more detail with reference to the drawings. However, exemplary embodiments can be implemented in various forms and should not be understood to be limited to the embodiments described herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The same reference numerals in the drawings represent the same or similar structures, and detailed descriptions will be omitted.

[0033] 1, a relay 1 according to an embodiment of the present application includes a housing 10, a coil unit 20, an arc-extinguishing unit 30, and a seal unit 40. The seal unit 40 is provided within the housing 10, and a tip of a fixed contact drawn-out end of the seal unit 40 is exposed to the outer surface of the housing 10 through an exposure hole 11a of the housing 10. The coil unit 20 and the arc-extinguishing unit 30 are both provided within the housing 10.

[0034] It will be understood that the terms "comprising" and "having" in the examples of this application, and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to such process, method, product, or device.

[0035] As an example, the housing 10 includes a first case 11 and a second case 12, and the first case 11 and the second case 12 are connected to form a chamber for accommodating the coil unit 20, the arc-extinguishing unit 30, and the seal unit 40. In the embodiment of the present application, the first case 11 is provided with an exposure hole 11a.

[0036] The arc-extinguishing unit 30 is used to extinguish an arc that occurs between the fixed contact lead-out end of the seal unit 40 and the movable contact.

[0037] As an example, the arc-extinguishing unit 30 includes two arc-extinguishing magnets 31. The arc-extinguishing magnets 31 may be permanent magnets, and each of the arc-extinguishing magnets 31 may be substantially rectangular. The two arc-extinguishing magnets 31 are provided on both sides of the seal unit 40, facing each other along the length direction of the movable contact.

[0038] By providing two opposing arc-extinguishing magnets 31, a magnetic field can be formed around the fixed contact pull-out end and the movable contact. Therefore, the arc generated between the fixed contact pull-out end and the movable contact is stretched in directions away from each other by the action of the magnetic field, thereby realizing arc extinction.

[0039] The arc-extinguishing unit 30 further includes two yoke clamps 32 arranged corresponding to the positions of the two arc-extinguishing magnets 31. The two yoke clamps 32 surround the seal unit 40 and the two arc-extinguishing magnets 31. The design of surrounding the arc-extinguishing magnets 31 with the yoke clamps 32 can prevent the magnetic field generated by the arc-extinguishing magnets 31 from diffusing to the outside and affecting the arc-extinguishing effect. The yoke clamps 32 are made of soft magnetic materials. Examples of soft magnetic materials include, but are not limited to, iron, cobalt, nickel, and alloys thereof.

[0040] As shown in FIGS. 2 to 4, the seal unit 40 includes a contact container 1000, a pair of fixed contact pull-out ends 2000, a movable assembly 3000, and a magnetic circuit portion 4000. As shown in FIG.

[0041] The contact container 1000 is a stationary component used to house the contact set, and is a device that is mainly a case and has a chamber. The contact container 1000 may also be composed of multiple components connected by a predetermined assembly method.

[0042] The contact container 1000 has a contact chamber 1001 therein. The contact container 1000 includes an insulating cover 1100 and a yoke plate 1200. The insulating cover 1100 covers one side of the yoke plate 1200. The contact chamber 1001 is surrounded by the insulating cover 1100 and the yoke plate 1200.

[0043] The insulating cover 1100 includes a ceramic cover 1110 and a flange member 1120. The ceramic cover 1110 is connected to the yoke plate 1200 via the flange member 1120. The flange member 1120 can be formed of a metal part having an annular structure such as an iron-nickel alloy, and one end of the flange member 1120 is connected to the opening edge of the ceramic cover 1110 by laser welding, brazing, resistance welding, adhesion, etc. The other end of the flange member 1120 is connected to the yoke plate 1200, and may be similarly laser welding, brazing, resistance welding, adhesion, etc. By providing the flange member 1120 between the ceramic cover 1110 and the yoke plate 1200, the connection between the ceramic cover 1110 and the yoke plate 1200 can be facilitated.

[0044] The contact container 1000 further has a pair of first through holes 1002, which are connected to the contact chamber 1001. The first through holes 1002 are for passing the fixed contact lead ends 2000 through. In the embodiment of the present application, the first through holes 1002 open to the ceramic cover 1110.

[0045] The pair of fixed contact lead ends 2000 are connected to the ceramic cover 1110 of the contact container 1000, and at least a portion of each fixed contact lead end 2000 is located within the contact chamber 1001. One of the pair of fixed contact lead ends 2000 functions as a current inflow terminal, and the other functions as a current outflow terminal.

[0046] A pair of fixed contact lead-out ends 2000 are drilled in a pair of first through holes 1002 in a one-to-one correspondence, and are connected to ceramic cover 1110 by, for example, welding.

[0047] The bottom of the fixed contact lead-out end 2000 serves as a fixed contact, and the fixed contact may be provided integrally with or separately from the bottom of the fixed contact lead-out end 2000 .

[0048] 3 and 4, the movable assembly 3000 includes a plurality of movable contacts 3110 arranged side by side, a push rod assembly 3200, and an elastic assembly 3300. The plurality of movable contacts 3110 are provided in the insulating cover 1100 and are installed on the push rod assembly 3200 via the elastic assembly 3300. Both ends of each movable contact 3110 along the first direction D1 are for contacting or separating from the pair of fixed contact pull ends 2000. The first direction D1 is the arrangement direction of the pair of fixed contact pull ends 2000. Since the plurality of movable contacts 3110 are arranged side by side, it can be understood that the number of contact points formed by the plurality of movable contacts 3110 and each fixed contact pull end 2000 is a plurality of numbers, such as two, three, four, etc.

[0049] In addition, if a pair of fixed contact lead-out ends 2000 and a plurality of movable contacts 3110 are regarded as one combination, the relay of the embodiment of the present application may include a plurality of combinations. Each movable contact 3110 may include a movable contact body and a movable contact provided on both ends of the movable contact body. The movable contact may be a separate component or may be connected to the movable contact body. Of course, the movable contact may be integrally formed with the movable contact body.

[0050] In the embodiment of the present application, the movable assembly 3000 includes two movable contacts 3110 arranged side by side. One end of each of the two movable contacts 3110 is used to contact or separate from the fixed contacts of one of the fixed contact pull-out ends 2000, and the other end of each of the two movable contacts 3110 is used to contact or separate from the fixed contacts of the other fixed contact pull-out end 2000. One end of each of the two movable contacts 3110 forms two contact points with one of the fixed contact pull-out ends 2000, and the other end of each of the two movable contacts 3110 forms two contact points with the other fixed contact pull-out end 2000.

[0051] In other embodiments, the number of movable contacts 3110 may be three, four, five, etc.

[0052] The movable assembly 3000 includes a plurality of movable contacts 3110, and both ends of the plurality of movable contacts 3110 in the first direction D1 are in contact with or separated from a pair of fixed contact lead ends, and the plurality of movable contacts 3110 are not constrained to each other, so that it can be understood that both ends of the plurality of movable contacts 3110 in the first direction D1 are in contact with a pair of fixed contact lead ends 2000 to form a reliable parallel circuit. Since the number of contact points formed by the plurality of movable contacts 3110 and one fixed contact lead end 2000 is two or more, a current shunting effect is obtained. In addition, according to the principle that the magnitude of the electromotive repulsive force is proportional to the square of the current, the magnitude of the electromotive repulsive force of each contact is greatly reduced, which is helpful in improving the short-circuit resistance and the reliability of the relay.

[0053] As shown in Fig. 3 and Fig. 4, the moving direction of the movable contact 3110 is defined as the second direction D2, and the direction perpendicular to the first direction D1 and the second direction D2 is defined as the third direction D3. The push rod assembly 3200 includes a push rod 3210 and a contact bracket 3220. The contact bracket 3220 includes a top wall 3221 and two side walls 3222, one end of each of the two side walls 3222 is integrally connected to both sides of the top wall 3221 along the third direction D3, and the other end of each of the two side walls 3222 is connected to the push rod 3210. The multiple movable contacts 3110 are installed in a space surrounded by the contact bracket 3220 via an elastic assembly 3300. Of course, in other embodiments, one end of each of the two side walls 3222 can be separately connected to both sides of the top wall 3221 along the third direction D3.

[0054] A locking hole 3223 is provided at the lower end of each side wall 3222 of the contact bracket 3220. The push rod 3210 includes a base 3211 and a rod portion 3212. The base 3211 is connected to one end of the rod portion 3212 in the axial direction. Locking sheets 3213 are provided on both sides of the base 3211, and the two locking sheets 3213 are inserted into the two locking holes 3223 of the contact bracket 3220, respectively, to fix the base 3211 and the contact bracket 3220. The elastic assembly 3300 is disposed between the multiple movable contacts 3110 and the base 3211, and is for applying an elastic force to the multiple movable contacts 3110 to move them toward the top wall 3221 and provide contact pressure.

[0055] It will be appreciated that the resilient assembly 3300 can flexibly support a number of movable contacts 3110 to provide contact pressure.

[0056] Of course, in other embodiments, the push rod assembly 3200 may have other configurations, which will not be described further herein.

[0057] Among these, the multiple movable contacts 3110 are arranged side by side along the third direction D3.

[0058] 3 and 4, the yoke plate 1200 has a second through hole 1210 penetrating two opposing side surfaces of the yoke plate 1200 along the thickness direction of the yoke plate 1200, and the second through hole 1210 communicates with the contact chamber 1001 of the contact container 1000. The rod portion 3212 is inserted into the second through hole 1210 so as to be movable along the axial direction. A base 3211 at one axial end of the rod portion 3212 is provided within the contact chamber 1001.

[0059] The seal unit 40 further includes a metal cover 5000, which is connected to the side of the yoke plate 1200 opposite to the insulating cover 1100 and covers the second through hole 1210 of the yoke plate 1200. The metal cover 5000 and the yoke plate 1200 form a chamber for accommodating the fixed iron core 4300 and the movable iron core 4400 of the magnetic circuit section 4000.

[0060] Returning to Fig. 1, the coil unit 20 includes a coil bobbin 21 and a coil 22. The coil bobbin 21 is hollow and cylindrical and is made of an insulating material. The metal cover 5000 is inserted into the coil bobbin 21. The coil 22 surrounds the coil bobbin 21.

[0061] As shown in Fig. 3 and Fig. 4, the magnetic circuit section 4000 includes a fixed core 4300, a movable core 4400, and a reset member 4500. The fixed core 4300 is fixedly provided in the metal cover 5000, and a part of the fixed core 4300 enters the second through hole 1210. The fixed core 4300 has a through hole 4310, which is provided corresponding to the position of the second through hole 1210, and is for drilling the rod section 3212. The movable core 4400 is movably disposed in the metal cover 5000, and is provided facing the fixed core 4300 along the axial direction of the rod section 3212. The movable core 4400 is connected to the rod section 3212, and is configured to be attracted to the fixed core 4300 when electricity is applied to the coil 22. The movable core 4400 and the rod portion 3212 can be connected by screwing, crimping, welding, or other methods.

[0062] The reset member 4500 is located inside the metal cover 5000, and is disposed between the fixed core 4300 and the movable core 4400, and is used to reset the movable core 4400 when the power supply to the coil 22 is cut off. The reset member 4500 may be a spring, and may be fitted onto the outside of the rod portion 3212.

[0063] When the coil 22 is energized, the magnetic circuit portion 4000 can drive the push rod assembly 3200 through the rod portion 3212 to move it upward. When the movable contactor 3110 comes into contact with the fixed contact pull-out end 2000, the movable contactor 3110 is stopped by the fixed contact pull-out end 2000, but the rod portion 3212 and the base 3211 continue to move upward until the overtravel is completed.

[0064] As shown in Figures 3 and 4, the relay 1 further includes a short-circuit resistant structure 6000 for forming an attractive force in the contact closing direction on the multiple movable contacts 3110, which can resist the electromotive repulsive force generated by the short-circuit current between the movable contacts 3110 and the fixed contact pull-out end 2000 and prevent the movable contacts 3110 and the fixed contact pull-out end 2000 from popping off each other.

[0065] Here, a contact gap between at least one of the multiple movable contactors 3110 and the fixed contact pull-out end 2000 is smaller than the contact gaps between the remaining movable contactors 3110 and the fixed contact pull-out end 2000. The attractive force applied to the movable contactor 3110 having the smaller contact gap is smaller than the attractive force applied to each of the remaining movable contactors 3110.

[0066] In addition, the attractive force applied to the movable contactor 3110 with the small contact gap being smaller than the attractive force applied to each of the remaining movable contactors 3110 may include the attractive force applied to the movable contactor 3110 with the small contact gap being zero, or the attractive forces applied to each movable contactor 3110 being all greater than zero, and the attractive force applied to the movable contactor 3110 with the smaller contact gap being smaller than the attractive force applied to each of the remaining movable contactors 3110.

[0067] When the number of movable contactors 3110 is three or more, the contact gap between one of the movable contactors 3110 and the fixed contact pull-out end 2000 will be the smallest, and the contact gaps between the remaining movable contactors 3110 and the fixed contact pull-out end 2000 may or may not be equal. Also, the attractive force applied to the movable contactor 3110 with the smallest contact gap will be the smallest, and the attractive forces applied to the remaining movable contactors 3110 may or may not be equal.

[0068] In addition, when the number of movable contactors 3110 is three or more, the contact gaps between two of the movable contactors 3110 and the fixed contact pull-out end 2000 are equal and smallest, and the contact gap between the remaining movable contactor 3110 and the fixed contact pull-out end 2000 may be larger than the contact gaps of the two movable contactors 3110.

[0069] Here, as a method for designing the contact gaps of the multiple movable contacts 3110 to be unequal, the methods shown in Figs. 5 and 6 can be adopted.

[0070] For ease of explanation, the following will take an example in which the number of movable contactors 3110 is two, and the two movable contactors 3110 are defined as the first movable contactor 100 and the second movable contactor 200, respectively, and the contact gap between the first movable contactor 100 and the fixed contact pull-out end 2000 is smaller than the contact gap between the second movable contactor 200 and the fixed contact pull-out end 2000 and the suction force applied to the first movable contactor 100 is zero, or the suction force applied to the first movable contactor 100 is not zero and is smaller than the suction force applied to the second movable contactor 200.

[0071] 5, the bottom surface of the fixed contact pull-out end 2000 is a flat surface, and the thicknesses of the first movable contactor 100 and the second movable contactor 200 are not equal. For example, since the thickness of the first movable contactor 100 is thicker than the thickness of the second movable contactor 200, the contact gap t1 between the first movable contactor 100 and the fixed contact pull-out end 2000 is smaller than the contact gap t2 between the second movable contactor 200 and the fixed contact pull-out end 2000.

[0072] As shown in Figure 6, the bottom surface of the fixed contact pull-out end 2000 is a stepped surface, and for example, the convex portion 2001 of the stepped surface corresponds to the first movable contactor 100, and the groove portion 2002 of the stepped surface corresponds to the second movable contactor 200, so that the contact gap t1 between the first movable contactor 100 and the convex portion 2001 is smaller than the contact gap t2 between the second movable contactor 200 and the groove portion 2002.

[0073] Below, taking the embodiment shown in Figure 5 as an example, we will explain in detail, in conjunction with Figures 7 and 8, that when the contact gaps between the first movable contact 100 and the second movable contact 200 and the fixed contact pull-out ends are different, the on / off sequence of the first movable contact 100 and the second movable contact 200 also differs.

[0074] In the closing process, the gap between the movable core 4400 and the fixed core 4300 is a constant value, so when the push rod assembly 3200 simultaneously drives the first movable contact 100 and the second movable contact 200 in a direction approaching the fixed contact pull-out end 2000, the first movable contact 100 comes into contact with the fixed contact pull-out end 2000 before the second movable contact 200 because the contact gap of the first movable contact 100 is small, that is, the first movable contact 100 with the small contact gap is connected first. At this time, the second movable contact 200 has not yet come into contact with the fixed contact pull-out end 2000 (as shown in FIG. 7).

[0075] Then, the push rod assembly 3200 continues to move in a direction approaching the fixed contact drawn end 2000, but at this time, the first movable contactor 100 is in contact with the fixed contact drawn end 2000 and cannot continue to move, so at this stage, only the movable contactor 200 moves in a direction approaching the fixed contact drawn end 2000 until the second movable contactor 200 also contacts the fixed contact drawn end 2000 (as shown in FIG. 8). At this time, the movable core 4400 is not yet in contact with the fixed core 4300. In the process in which the second movable contactor 200 moves from the position shown in FIG. 7 to the position shown in FIG. 8, the first movable contactor 100 does not move at all and is in the overtravel stage.

[0076] After both the first movable contactor 100 and the second movable contactor 200 contact the fixed contact lead end 2000, the movable core 4400 continues to move a certain distance until the movable core 4400 contacts the fixed core 4300. At this stage when the movable core 4400 continues to move, the first movable contactor 100 and the second movable contactor 200 do not continue to move together, and at this time, both the first movable contactor 100 and the second movable contactor 200 are in the overtravel stage.

[0077] From the above, it can be seen that the over-travel distance of the first movable contact 100 is greater than the over-travel distance of the second movable contact 200.

[0078] In the breaking process, the break can be performed in the order of Fig. 8 → Fig. 7 → Fig. 5. The breaking process is a process of releasing the overtravel and contact gap for the first movable contactor 100 and the second movable contactor 200. Since the contact gap of the first movable contactor 100 is small, the overtravel distance of the first movable contactor 100 is large. Therefore, in the breaking process, the second movable contactor 200 is broken before the first movable contactor 100, that is, the first movable contactor 100 with the small contact gap is broken later.

[0079] From this, it can be concluded that in the closing process, the first movable contact 100 is connected before the second movable contact 200, and in the breaking process, the second movable contact 200 is broken before the first movable contact 100.

[0080] In the following, an example in which the number of the movable contacts 3110 is still two will be taken to describe in detail the breaking process of the two movable contacts 3110 when the limit breaking current and the short circuit current are respectively supplied to the two movable contacts 3110. The two movable contacts 3110 are the first movable contact 100 and the second movable contact 200, respectively.

[0081] When a limit breaking current (for example, 2 kA) flows, the first movable contactor 100 and the second movable contactor 200 form a parallel circuit, so that a current of 1 kA flows through both the first movable contactor 100 and the second movable contactor 200. Since the second movable contactor 200 is broken before the first movable contactor 100 in the breaking process, the first movable contactor 100 is still in contact with the fixed contact lead end 2000 even immediately after the second movable contactor 200 is broken, so that the entire current of 2 kA flows through the first movable contactor 100. In addition, since the attractive force of the short-circuit resistant structure 6000 against the first movable contactor 100 is zero or small, the breaking process of the first movable contactor 100 does not need to resist the attractive force of the short-circuit resistant structure 6000, or the attractive force to be resisted is very small, which is advantageous for breaking the entire relay.

[0082] When a short-circuit current (e.g., 20 kA) flows, the first movable contactor 100 and the second movable contactor 200 form a parallel circuit, and therefore a current of 10 kA flows through both the first movable contactor 100 and the second movable contactor 200. Since the attractive force of the short-circuit resistant structure 6000 to the first movable contactor 100 is smaller than the attractive force of the short-circuit resistant structure 6000 to the second movable contactor 200, the first movable contactor 100 is preferentially repelled over the second movable contactor 200 due to the electric repulsive force between the contacts. Therefore, the current of the first movable contactor 100 gradually changes from 10 kA to 0 kA, and the current of the second movable contactor 200 gradually changes from 10 kA to 20 kA. The current of the second movable contact 200 gradually increases from 10 kA to 20 kA, and since the increase in current has a stepwise process, the electromechanical repulsive force between the second movable contact 200 and the fixed contact lead end 2000 also gradually increases. Therefore, the attraction force of the short-circuit-resistant structure 6000 acting on the second movable contact 200 can resist a certain electromechanical repulsive force, play a role in delaying the disconnection, and win the reaction time for the short-circuit disconnection of the entire circuit.

[0083] Therefore, the relay of the embodiment of the present application is not only useful for realizing the limit interruption between the contacts, but also can realize the delayed disconnection of the contacts in the event of a short circuit, thereby ensuring the reliability of the relay operation and extending the product life.

[0084] 3 and 4 again, the short-circuit resistant structure 6000 includes a first magnetic conductive body 6100 and at least one second magnetic conductive body 6200. The first magnetic conductive body 6100 is disposed on a side of the plurality of movable contactors 3110 facing the fixed contact lead end 2000. Along the contact closing direction, the first magnetic conductive body 6100 at least partially overlaps each of the movable contactors 3110. One second magnetic conductive body 6200 is fixedly connected to one side of the remaining movable contactors 3110, except for the movable contactor 3110 having a small contact gap, facing away from the fixed contact lead end 2000, and the first magnetic conductive body 6100 is configured to form a magnetic circuit with at least one second magnetic conductive body 6200.

[0085] When the number of movable contactors 3110 is two, no second magnetic conductive body 6200 is connected to the first movable contactor 100, and one second magnetic conductive body 6200 is fixedly connected to one side facing the fixed contact lead-out end 2000 of the second movable contactor 200.

[0086] When the first movable contactor 100 and the second movable contactor 200 are energized, the portion of the first magnetic conductive body 6100 corresponding to the position of the first movable contactor 100 is magnetized, so that an attractive force is generated in the contact closing direction with respect to the first movable contactor 100. For the second movable contactor 200, a magnetic circuit surrounding the second movable contactor 200 is formed between the first magnetic conductive body 6100 and the second magnetic conductive body 6200 on both sides of the second movable contactor 200. When a short-circuit current flows through the second movable contactor 200, an attractive force is generated between the first magnetic conductive body 6100 and the second magnetic conductive body 6200 along the contact pressure direction, and this attractive force can resist the electric repulsive force generated by the short-circuit current between the second movable contactor 200 and the fixed contact lead end 2000.

[0087] In addition, since the first magnetic conductive body 6100 and the second magnetic conductive body 6200 are located on one side of the movable contact 3110 facing the fixed contact drawn end 2000 and one side facing away from the fixed contact drawn end, respectively, the attractive force between the first magnetic conductive body 6100 and the second magnetic conductive body 6200 is a direct electromagnetic attractive force, and can more effectively resist the electromotive repulsive force generated by the short-circuit current between the second movable contact 200 and the fixed contact drawn end 2000. In other words, the attractive force that the short-circuit resistant structure 6000 exerts on the first movable contact 100 is smaller than the attractive force that it exerts on the second movable contact 200. In other words, the attractive force exerted on the movable contact 3110 with a small contact gap is smaller than the attractive force exerted on the remaining movable contacts 3110.

[0088] It will be understood that the first magnetic conductive body 6100 and the second magnetic conductive body 6200 may be straight or U-shaped, and that the first magnetic conductive body 6100 and the second magnetic conductive body 6200 may be made using soft magnetic materials such as iron, cobalt, nickel, and alloys thereof.

[0089] Optionally, the first magnetic conductive body 6100 may include multiple laminated magnetic conductive pieces. It will be understood that the overall thickness of the first magnetic conductive body 6100 can be increased by increasing the number of thin magnetic conductive pieces. On the one hand, the magnetic conductive pieces are relatively thin and can be made of thin materials, so that the material cost is low and it is easy to operate. On the other hand, the number of magnetic conductive pieces can be flexibly adjusted according to the magnitude of the short circuit current.

[0090] Of course, in other embodiments, the short-circuit resistant structure may include a plurality of second magnetic conductive bodies 6200, and the thicknesses of the plurality of second magnetic conductive bodies 6200 may be different. For example, the thickness of the second magnetic conductive body corresponding to the movable contactor with a small contact gap is thinner than the thickness of the other second magnetic conductive bodies. Or, the thickness of the second magnetic conductive body corresponding to the movable contactor with a small attractive force is thinner than the thickness of the other second magnetic conductive bodies. For example, in order to make the attractive force applied to the first movable contactor 100 smaller than the attractive force applied to the second movable contactor 200, the second magnetic conductive body 6200 may be connected to one side of the first movable contactor 100 and the second movable contactor 200 facing away from the fixed contact lead-out end 2000, and the thickness of the second magnetic conductive body 6200 connected to the first movable contactor 100 may be thinner than the thickness of the second magnetic conductive body 6200 connected to the second movable contactor 200.

[0091] 3 and 4, the first magnetic conductive body 6100 is fixedly disposed relative to the contact container 1000. In this manner, the suction force of the short-circuit resistant structure 6000 is transmitted to the contact container 1000, and since the contact container 1000 is a fixed component, excessive coil holding force is not required, which leads to a reduction in the power consumption of the relay coil, a miniaturization of the relay, and an improvement in the short-circuit resistance.

[0092] Furthermore, the first magnetic conductive body 6100 is connected to the ceramic cover 1110 of the insulating cover 1100 via the connecting member 300. A third through hole 1111 is provided in the ceramic cover 1110 of the insulating cover 1100, and the connecting member 300 is rod-shaped and is drilled in the third through hole 1111. One end of the connecting member 300 is connected to the insulating cover 1100, and the other end is connected to the first magnetic conductive body 6100.

[0093] The connection between one axial end of the connection member 300 and the ceramic cover 1110 can be implemented by various methods, such as welding, crimping, screwing, adhesion, etc. The connection between the other end of the connection member 300 and the first magnetic conductive body 6100 can also be implemented by various methods, such as welding, crimping, screwing, adhesion, etc.

[0094] When one end of the connecting member 300 is connected to the ceramic cover 1110 by welding, by welding the connecting member 300 to the top wall of the ceramic cover 1110, the metallized layer can be processed only on the periphery of the third through hole 1111 on the outer wall surface of the top wall without processing the metallized layer on the inner wall surface of the top wall, which not only makes processing easier but also simplifies the processing procedure.

[0095] It can be understood that one end of the connecting member 300 may be connected to the outer wall surface of the ceramic cover 1110, may be connected to the inner wall surface of the ceramic cover 1110, or may be connected to both the outer wall surface and the inner wall surface of the ceramic cover 1110 simultaneously.

[0096] From this, it can be seen that since the first magnetic conductive body 6100 is connected to the ceramic cover 1110 via the connecting member 300, on the one hand, the short-circuit resistant attractive force is transmitted to the ceramic cover 1110, eliminating the need for excessive coil holding force, thereby reducing the power consumption of the relay coil, miniaturizing the relay, and improving the short-circuit resistance capability; on the other hand, since the connecting member 300 is connected to the ceramic cover 1110, it does not occupy much space in the contact chamber, and the extinguishing space of the arc-extinguishing assembly and the movement space of the push rod are secured.

[0097] Furthermore, since the first magnetic conductive body 6100 is connected to the rod-shaped connecting member 300, various connection methods such as crimping, laser welding, engagement, and adhesive bonding can be used between the first magnetic conductive body 6100 and the connecting member 300, providing a wide range of connection methods.

[0098] As an example, the connection member 300 is a solid rod. In this manner, the connection between the connection member 300 and the first magnetic conductive body 6100 can be made more reliable by connecting them by crimping. Furthermore, the solid rod has higher support strength and is less likely to deform.

[0099] Of course, the first magnetic conductive body 6100 may be fixedly provided in the contact receptacle 1000 via a fixing bracket (not shown). Specifically, the fixing bracket is provided in the contact receptacle 1000 and fixedly connected to the yoke plate 1200, and the first magnetic conductive body 6100 is fixedly connected to the fixing bracket.

[0100] In yet another embodiment, the distance between the first magnetic conductive body 6100 and the second magnetic conductive body 6200 can be designed to be variable. Specifically, the distance between the first magnetic conductive body 6100 and the second magnetic conductive body 6200 can be adjusted according to the magnitude of the current value, and further, by changing the magnitude of the magnetic attractive force generated between the first magnetic conductive body 6100 and the second magnetic conductive body 6200, not only the requirement of short circuit resistance but also the requirement of overload interruption can be satisfied.

[0101] In one embodiment, the elastic assembly 3300 may be a compression spring or a leaf spring. The number of compression springs or leaf springs may be one or more. The number of compression springs or leaf springs may be the same as the number of movable contacts.

[0102] The following, in conjunction with Figures 9 to 12, shows schematic diagrams of a short-circuit resistant structure 6000 and multiple movable contacts 3110 in four different embodiments, respectively.

[0103] 9, the movable contactor 3110 is composed of two parts, the first movable contactor 100 and the second movable contactor 200. The short-circuit resistant structure 6000 includes one straight-shaped first magnetic body 6100, which is provided only on one side of the second movable contactor 200 facing the fixed contact lead-out end 2000, and is not provided on one side of the first movable contactor 100 facing the fixed contact lead-out end 2000. As a result, the attractive force acting on the first movable contactor 100 can be considered to be zero.

[0104] 10, the movable contactor 3110 is composed of two parts, the first movable contactor 100 and the second movable contactor 200. The short-circuit resistant structure 6000 includes one straight-shaped first magnetic body 6100 and one U-shaped second magnetic body 6200, where the first magnetic body 6100 is provided on one side facing the fixed contact lead end 2000 of the second movable contactor 200, and the second magnetic body 6200 is provided on one side facing away from the fixed contact lead end 2000 of the second movable contactor 200. This allows the attractive force acting on the first movable contactor 100 to be considered as zero.

[0105] As shown in Fig. 11, the movable contactor 3110 is composed of two parts, a first movable contactor 100 and a second movable contactor 200. The short-circuit resistant structure 6000 includes one U-shaped first magnetic conductive body 6100 and one straight-line shaped second magnetic conductive body 6200. The first magnetic conductive body 6100 is provided on one side facing the fixed contact lead end 2000 of the second movable contactor 200, and the second magnetic conductive body 6200 is provided on one side facing away from the fixed contact lead end 2000 of the second movable contactor 200. This allows the attractive force acting on the first movable contactor 100 to be considered to be zero.

[0106] 12, the number of movable contacts 3110 is three. The short-circuit resistant structure 6000 includes two straight-shaped first magnetic bodies 6100 and two U-shaped second magnetic bodies 6200, where the two first magnetic bodies 6100 are provided on one side facing the fixed contact lead-out ends 2000 of the two movable contacts 3110, respectively, and the two second magnetic bodies 6200 are provided on one side facing away from the fixed contact lead-out ends 2000 of the two movable contacts 3110, respectively. As a result, the attractive force acting on the remaining movable contacts 3110 can be considered to be zero.

[0107] As shown in Figs. 13 to 15, the seal unit of the second embodiment has a similar basic structure to that of the seal unit of the first embodiment. Therefore, in the following description of the seal unit of the second embodiment, the structure already described in the first embodiment will not be repeated. Note that the same components as those in the seal unit described in the first embodiment are given the same reference numerals. Therefore, in the following description of this embodiment, the differences from the seal unit of the first embodiment will be mainly described.

[0108] 14 and 15, the short-circuit resistant structure 6000 includes at least one first magnetic conductive body 6100 and at least one second magnetic conductive body 6200, and the at least one first magnetic conductive body 6100 is provided on one side of the multiple movable contactors 3110 facing the fixed contact lead end 2000. Along the contact closing direction, the number and position of the at least one first magnetic conductive body 6100 correspond to the number and positions of the remaining movable contactors 3110. Among the multiple movable contactors 3110, one second magnetic conductive body 6200 is fixedly connected to one side facing the fixed contact lead end 2000 of the remaining movable contactors 3110 except for the movable contactor 3110 having a small contact gap, and the corresponding first magnetic conductive body 6100 and second magnetic conductive body 6200 are configured to form a magnetic circuit.

[0109] When the number of movable contacts 3110 is two, the short-circuit resistant structure 6000 includes one first magnetic conductive body 6100 and one second magnetic conductive body 6200, and the first magnetic conductive body 6100 is provided only on one side of the second movable contact 2000 facing the fixed contact lead end 2000, and is not provided on one side of the first movable contact 100 facing the fixed contact lead end 2000. The second magnetic conductive body 6200 is fixedly provided on one side facing the fixed contact lead end 2000 of the second movable contact 200. Since the first movable contact 100 is not provided with the first magnetic conductive body 6100 and the second magnetic conductive body 6200, the attractive force acting on the first movable contact 100 can be considered to be zero.

[0110] 14 and 15, at least one first magnetic conductive body 6100 is attached to the push rod assembly 3200. Furthermore, the at least one first magnetic conductive body 6100 is connected to one side surface of the top wall 3221 of the contact bracket 3220 facing the push rod 3210.

[0111] The top wall 3221 includes a first section 3221a, a second section 3221b, and a bent section 3221c, and the bent section 3221c is connected to the first section 3221a and is bent from the first section 3221a in a direction away from the push rod 3210 to be connected to the second section 3221b. One end of each of the two side walls 3222 is connected to the first section 3221a and the second section 3221b. At least one first magnetic conductive body 6100 is connected to a surface of one side of the second section 3221b facing the push rod 3210, and the surface of one side of the at least one first magnetic conductive body 6100 facing the push rod 3210 and the surface of one side of the first section 3221a facing the push rod 3210 are flush with each other.

[0112] As a variant, the present application further provides a relay, which differs from the relay of the above-described embodiment in the following respects:

[0113] The contact gaps between each movable contactor 3110 and the fixed contact lead-out end 2000 are equal. The short-circuit resistant structure 6000 is configured to generate an attractive force in the contact closing direction on the multiple movable contactors 3110. Here, the attractive force applied to at least one movable contactor 3110 among the multiple movable contactors 3110 is smaller than the attractive force applied to the remaining movable contactors 3110.

[0114] In addition, the attractive force applied to at least one movable contactor 3110 being smaller than the attractive forces applied to the remaining movable contactors 3110 includes the following situations: the attractive force applied to at least one movable contactor 3110 is zero, or the attractive forces applied to each movable contactor 3110 are all greater than 0 and the attractive force applied to at least one movable contactor 3110 is smaller than the attractive forces applied to each of the remaining movable contactors 3110.

[0115] For example, when the number of movable contacts 3110 is three or more, the attractive force applied to one or two of the movable contacts 3110 may be zero, and the attractive force applied to the remaining one or two of the movable contacts 3110 may be greater than zero. Alternatively, the attractive force applied to each movable contact 3110 may be greater than zero, and the attractive force applied to one of the movable contacts 3110 may be less than the attractive forces applied to the remaining two movable contacts 3110, and the attractive forces applied to the remaining two movable contacts 3110 may be equal, but may not be equal. Alternatively, the attractive force applied to each movable contact 3110 may be greater than zero, and the attractive forces applied to the two movable contacts 3110 among them may be equal, and less than the attractive force applied to the remaining one movable contact 3110.

[0116] As shown in Figures 9 to 11, for the sake of convenience in the following explanation, the number of movable contactors 3110 is set to two, and the two movable contactors 3110 are defined as the first movable contactor 100 and the second movable contactor 200, respectively, the contact gap between the first movable contactor 100 and the fixed contact pull-out end 2000 is equal to the contact gap between the second movable contactor 200 and the fixed contact pull-out end 2000, and the suction force applied to the first movable contactor 100 is smaller than the suction force applied to the second movable contactor 200.

[0117] Since the contact gap between the first movable contactor 100 and the fixed contact pull-out end 2000 is equal to the contact gap between the second movable contactor 200 and the fixed contact pull-out end 2000, in the closing process, the first movable contactor 100 and the second movable contactor 200 are connected simultaneously, and in the breaking process, the first movable contactor 100 and the second movable contactor 200 are disconnected simultaneously.

[0118] When a limit breaking current (e.g., 2 kA) flows, the first movable contactor 100 and the second movable contactor 200 form a parallel circuit, so that a current of 1 kA flows through both the first movable contactor 100 and the second movable contactor 200. After the current is shunted, the current flowing through the first movable contactor 100 and the second movable contactor 200 becomes smaller, and the suction force of the short-circuit resistant structure 6000 acting on the first movable contactor 100 and the second movable contactor 200 becomes smaller, which is helpful for timely breaking.

[0119] When a short circuit current (e.g., 20 kA) flows, the first movable contactor 100 and the second movable contactor 200 form a parallel circuit, so that a current of 10 kA flows through both the first movable contactor 100 and the second movable contactor 200. Since the attractive force on the first movable contactor 100 is smaller than that on the second movable contactor 200, the first movable contactor 100 is repelled by the electric repulsive force between the contacts in preference to the second movable contactor 200. As a result, the current of the movable contactor 100 gradually changes from 10 kA to 0 kA, and the current of the second movable contactor 200 gradually changes from 10 kA to 20 kA. The current of the second movable contactor 200 gradually increases from 10 kA to 20 kA, and since the increase in current has a stepwise process, it is shown that the electric repulsive force between the contacts of the second movable contactor 200 and the fixed contact lead end 2000 also gradually increases. Therefore, the attractive force of the short-circuit-resistant structure 6000 acting on the second movable contact 200 can resist a certain electromechanical repulsive force, play a role in delaying the disconnection, and can gain reaction time for the short-circuit disconnection of the entire circuit.

[0120] It can be seen that the relays of the embodiments of the present application are similarly useful not only for realizing limit interruption between the contacts, but also for realizing delayed disconnection of the contacts in the event of a short circuit, thereby ensuring the reliability of the relay operation and extending the product life.

[0121] It should be understood that the various examples / embodiments provided by the present application can be combined with each other without contradiction, and examples will not be given here one by one.

[0122] In the examples of the present application, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" means two or more unless otherwise limited. Terms such as "attach", "contact", "connect", "fixed" and the like should be understood broadly. For example, "connection" may be a fixed connection, a removable connection, or an integral connection. "Contact" may be a direct connection or an indirect connection via an intermediate medium. The specific meaning of the above terms in the examples of the present application can be understood by those skilled in the art according to the specific situation.

[0123] In describing the embodiments of the present application, the orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "front," and "rear" are orientations or positional relationships based on the drawings and are intended merely to facilitate the explanation and simplification of the description of the embodiments of the present application, and do not indicate or imply that the indicated devices or units are required to have a particular orientation or be configured and operated in a particular orientation, and therefore should not be understood as limitations on the embodiments of the present application.

[0124] In the description herein, the term "one embodiment," "some embodiments," "particular embodiment," and the like means that the particular feature, structure, material, or characteristic described in connection with this embodiment or example is included in at least one embodiment or example of the embodiments of the present application. In the present specification, general expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0125] The above are only preferred embodiments of the present application, and are not used to limit the embodiments of the present application. For those skilled in the art, the embodiments of the present application may be modified and changed in various ways. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. The connector comprises a pair of fixed contact lead-out ends, a plurality of movable contacts, and a short-circuit resistant structure, Both ends of each movable contactor along a first direction are for contacting or separating from a pair of the fixed contact pull-out ends, the first direction being an arrangement direction of the pair of the fixed contact pull-out ends, and a contact gap between at least one of the movable contactors and the fixed contact pull-out ends is smaller than a contact gap between the remaining movable contactors and the fixed contact pull-out ends; The short-circuit resistant structure is configured to generate an attractive force in a contact closing direction on the plurality of movable contacts, and the attractive force applied to the movable contact having a small contact gap is smaller than the attractive force applied to each of the remaining movable contacts. A relay characterized by:

2. the short-circuit resistant structure includes a first magnetic conductive body and at least one second magnetic conductive body; The first magnetic conductive body is provided on one side of the plurality of movable contacts toward the fixed contact pull-out ends, and the first magnetic conductive body at least partially overlaps each of the movable contacts along a contact closing direction; Among the plurality of movable contacts, one of the second magnetic conductive bodies is fixedly connected to one side facing the fixed contact lead-out end of each of the remaining movable contacts, except for the movable contacts having a small contact gap, and the first magnetic conductive body is configured to form a magnetic circuit with at least one of the second magnetic conductive bodies.

2. A relay as claimed in claim 1.

3. the relay further comprises a contact container, the contact container being provided with a pair of first through holes, the pair of fixed contact lead ends being respectively drilled into the pair of first through holes, and the plurality of movable contacts being provided within the contact container; The first magnetic conductive body is provided in the contact container and is fixed to the contact container.

3. A relay as claimed in claim 2.

4. The contact container includes a yoke plate and an insulating cover, The insulating cover covers one side surface of the yoke plate, the insulating cover is provided with a pair of the first through holes, and the first magnetic conductive body is connected to the insulating cover via a connecting member.

4. A relay as claimed in claim 3.

5. The insulating cover is provided with a third through hole, The connecting member is rod-shaped and is inserted into the third through hole, one end of the connecting member is connected to the insulating cover, and the other end is connected to the first magnetic conductive body.

5. A relay as claimed in claim 4.

6. the insulating cover includes a ceramic cover and a flange member, the ceramic cover is connected to the yoke plate via the flange member, The ceramic cover is provided with a pair of the first through holes, and the first magnetic conductive body is connected to the ceramic cover via the connecting member.

5. A relay as claimed in claim 4.

7. the short-circuit resistant structure includes at least one first magnetic conductive body and at least one second magnetic conductive body; At least one first magnetic conductive body is provided on one side of the plurality of movable contacts toward the fixed contact pull-out ends, and the number and position of the at least one first magnetic conductive body along a contact closing direction respectively correspond to the number and position of the remaining movable contacts, Among the plurality of movable contacts, one of the second magnetic conductive bodies is fixedly connected to one side facing the fixed contact lead-out end of each of the remaining movable contacts, except for the movable contacts having a small contact gap, and the corresponding first magnetic conductive body and the second magnetic conductive body are configured to form a magnetic circuit.

2. A relay as claimed in claim 1.

8. The relay further comprises a push rod assembly. the plurality of movable contacts are attached to the push rod assembly via a resilient assembly, the resilient assembly configured to provide a contact pressure to the plurality of movable contacts; At least one of the first magnetic bodies is attached to the push rod assembly.

8. A relay as claimed in claim 7.

9. A moving direction of the movable contact is defined as a second direction; the push rod assembly includes a push rod and a contact bracket; the contact bracket includes a top wall and two side walls, one ends of the two side walls are respectively connected to both sides of the top wall along a third direction, and the other ends of the two side walls are respectively connected to the push rod, and the first direction, the second direction, and the third direction are perpendicular to each other; At least one of the first magnetic conductive bodies is connected to the top wall.

9. A relay as claimed in claim 8.

10. the top wall includes a first section, a second section, and a bent section, the bent section is connected to the first section and is bent from the first section in a direction away from the push rod to be connected to the second section, one end of each of the two side walls is connected to the first section and the second section, At least one of the first magnetic conductive bodies is connected to a surface of one side of the second section facing the push rod, and the surface of the at least one of the first magnetic conductive bodies facing the push rod and the surface of the first section facing the push rod are flush with each other.

10. A relay as claimed in claim 9.

11. The attractive force acting on the movable contact with a small contact gap is zero.

2. A relay as claimed in claim 1.

12. The short-circuit resistant structure includes at least one first magnetic conductive body; Among the plurality of movable contacts, one of the first magnetic bodies is provided on one side of the remaining movable contacts, excluding the movable contacts having a small contact gap, facing the fixed contact drawn end.

12. A relay as claimed in claim 11.

13. The plurality of movable contacts are arranged side by side along a third direction, The moving direction of the movable contact is defined as a second direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

2. A relay as claimed in claim 1.

14. the short-circuit resistant structure includes a first magnetic conductive body and a plurality of second magnetic conductive bodies; The first magnetic conductive body is provided on one side of the plurality of movable contacts toward the fixed contact pull-out ends, and the first magnetic conductive body at least partially overlaps each of the movable contacts along a contact closing direction; One of the second magnetic conductive bodies is fixedly connected to each of the plurality of movable contacts on one side facing the fixed contact lead-out end, and the first magnetic conductive body is configured to form a magnetic circuit with the plurality of second magnetic conductive bodies. Among the plurality of second magnetic conductive bodies, the thickness of the second magnetic conductive body connected to the movable contact having a small contact gap is thinner than the thickness of the other second magnetic conductive bodies.

2. A relay as claimed in claim 1.

15. the short-circuit resistant structure includes a plurality of first magnetic conductive bodies and a plurality of second magnetic conductive bodies; a plurality of first magnetic conductive bodies are provided on one side of the plurality of movable contacts toward the fixed contact drawn-out ends, and the number and positions of the plurality of first magnetic conductive bodies along a contact closing direction correspond to the number and positions of the movable contacts, respectively; One of the second magnetic conductive bodies is fixedly connected to each of the plurality of movable contacts on one side facing the fixed contact lead-out end, and the plurality of first magnetic conductive bodies are configured to form a magnetic circuit with the plurality of second magnetic conductive bodies, and the thickness of the second magnetic conductive body connected to the movable contact having a small contact gap among the plurality of second magnetic conductive bodies is thinner than the thickness of the other second magnetic conductive bodies.

2. A relay as claimed in claim 1.

16. The connector comprises a pair of fixed contact lead-out ends, a plurality of movable contacts, and a short-circuit resistant structure, Both ends of each movable contact along a first direction are for contacting or separating from a pair of the fixed contact lead ends, the first direction is an arrangement direction of the pair of the fixed contact lead ends, and contact gaps between each of the movable contacts and the fixed contact lead ends are equal; The short-circuit resistant structure is configured to generate an attractive force in a contact closing direction on the plurality of movable contacts, and an attractive force applied to at least one of the plurality of movable contacts is smaller than an attractive force applied to the remaining movable contacts. A relay characterized by:

17. the short-circuit resistant structure includes a first magnetic conductive body and at least one second magnetic conductive body; The first magnetic conductive body is provided on one side of the plurality of movable contacts toward the fixed contact pull-out ends, and the first magnetic conductive body at least partially overlaps each of the movable contacts along a contact closing direction; Among the plurality of movable contacts, one of the second magnetic conductive bodies is fixedly connected to one side facing the fixed contact lead-out end of each of the remaining movable contacts, except for the movable contacts having a small attractive force, and the first magnetic conductive body is configured to form a magnetic circuit with at least one of the second magnetic conductive bodies.

17. A relay as claimed in claim 16.

18. the short-circuit resistant structure includes at least one first magnetic conductive body and at least one second magnetic conductive body; At least one first magnetic conductive body is provided on one side of the plurality of movable contacts toward the fixed contact pull-out ends, and the number and position of the at least one first magnetic conductive body along a contact closing direction respectively correspond to the number and position of the remaining movable contacts, Among the plurality of movable contacts, one of the second magnetic bodies is fixedly connected to one side facing the fixed contact lead-out end of each of the remaining movable contacts, except for the movable contacts having a small attractive force, and the corresponding first magnetic body and the second magnetic body are configured to form a magnetic circuit.

17. A relay as claimed in claim 16.

19. The attractive force acting on one of the movable contacts is zero.

17. A relay as claimed in claim 16.

20. The short-circuit resistant structure includes at least one first magnetic conductive body; Among the plurality of movable contacts, one of the first magnetic bodies is provided on one side of the remaining movable contacts, except for the movable contacts having a small attractive force, facing the fixed contact drawn end.

20. A relay as claimed in claim 19.

21. The plurality of movable contacts are arranged side by side along a third direction, The moving direction of the movable contact is defined as a second direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

17. A relay as claimed in claim 16.

22. the short-circuit resistant structure includes a first magnetic conductive body and a plurality of second magnetic conductive bodies; The first magnetic conductive body is provided on one side of the plurality of movable contacts toward the fixed contact pull-out ends, and the first magnetic conductive body at least partially overlaps each of the movable contacts along a contact closing direction; One of the second magnetic conductive bodies is fixedly connected to each of the plurality of movable contacts on one side facing the fixed contact lead-out end, and the first magnetic conductive body is configured to form a magnetic circuit with the plurality of second magnetic conductive bodies, and the thickness of the second magnetic conductive body connected to the movable contact having a smaller attractive force among the plurality of second magnetic conductive bodies is thinner than the thickness of the other second magnetic conductive bodies.

17. A relay as claimed in claim 16.

23. the short-circuit resistant structure includes a plurality of first magnetic conductive bodies and a plurality of second magnetic conductive bodies; a plurality of first magnetic conductive bodies are provided on one side of the plurality of movable contacts toward the fixed contact drawn-out ends, and the number and positions of the plurality of first magnetic conductive bodies along a contact closing direction correspond to the number and positions of the movable contacts, respectively; One of the second magnetic conductive bodies is fixedly connected to each of the plurality of movable contacts on one side facing the fixed contact lead-out end, and the plurality of first magnetic conductive bodies are configured to form a magnetic circuit with the plurality of second magnetic conductive bodies, and the thickness of the second magnetic conductive body connected to the movable contact having a smaller attractive force among the plurality of second magnetic conductive bodies is thinner than the thickness of the other second magnetic conductive bodies.

17. A relay as claimed in claim 16.

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