Relay

Abstract

A relay, comprising a push rod assembly, a movable spring assembly and an elastic assembly. The movable spring assembly comprises a movable spring plate, and the elastic assembly is connected to the movable spring assembly and the push rod assembly, the elastic assembly being used for providing contact pressure for the movable spring plate. During an overstroke process, the push rod assembly presses the elastic assembly, and the positions thereof relative to the movable spring plate have an overstroke initial position, an overstroke ending position and a transition position located between the overstroke initial position and the overstroke ending position; during a process in which the push rod assembly moves from the overstroke initial position to the transition position, the elastic assembly has a first stiffness coefficient; during a process in which the push rod assembly moves from the transition position to the overstroke ending position, the elastic assembly has a second stiffness coefficient, the first stiffness coefficient being smaller than the second stiffness coefficient.

Description

relay

[0001] This disclosure claims priority to Chinese patent application No. 202311187669.1 filed on September 14, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the technical field of electronic control devices, and in particular to a relay. Background Art

[0003] A relay is an electronic control device with a control circuit (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits. A relay is essentially an "automatic switch" that uses a smaller current to control a larger one. Therefore, it plays a role in automatic regulation, safety protection, and circuit switching.

[0004] A high-voltage DC relay is a type of relay. Prior art high-voltage DC relays include a pair of static contact leads, a moving assembly, a coil unit, and a magnetic circuit. The moving assembly includes a moving reed, a push rod assembly, and an elastic assembly. The moving reed is mounted on the push rod assembly via the elastic assembly. The magnetic circuit includes a static iron core and a moving iron core. The static iron core is fixed in the relay, and the moving iron core is connected to the push rod assembly. When the coil unit is energized, the static iron core generates a magnetic attraction force and attracts the moving iron core to move, thereby driving the push rod assembly and the moving reed to move together to achieve contact closure.

[0005] In existing technology, to ensure good electrical connection between the moving and static contacts, increasing contact pressure is often employed, i.e., increasing the elastic force of the elastic component. Increasing the elastic force of the elastic component also increases the power consumption of the coil unit, which contradicts the current trend towards smaller coil units and lower power consumption.

[0006] Summary of the Invention

[0007] The embodiment of the present disclosure provides a relay that reduces coil power consumption while ensuring sufficient contact pressure by changing the stiffness coefficient of an elastic component, thereby solving the technical problems existing in the prior art.

[0008] The relay according to the embodiment of the present disclosure includes:

[0009] Push rod assembly;

[0010] A dynamic spring assembly, including a dynamic spring leaf;

[0011] an elastic component connected to the dynamic spring component and the push rod component, the elastic component being used to provide contact pressure to the dynamic spring piece;

[0012] Wherein, during the overtravel process, the push rod assembly squeezes the elastic assembly, and its position relative to the dynamic spring has an overtravel initial position, an overtravel end position, and a transition position between the overtravel initial position and the overtravel end position;

[0013] In which, when the push rod assembly moves from the over-travel initial position to the transition position, the elastic assembly has a first stiffness coefficient; when the push rod assembly moves from the transition position to the over-travel end position, the elastic assembly has a second stiffness coefficient, and the first stiffness coefficient is smaller than the second stiffness coefficient.

[0014] According to some embodiments of the present disclosure, the elastic component is a leaf spring, and the leaf spring is connected to the dynamic spring component and the push rod component.

[0015] According to some embodiments of the present disclosure, the relay further includes a pair of static contact terminals, and the two ends of the movable reed along a first direction are used to respectively contact or separate with the pair of static contact terminals; the first direction is the arrangement direction of the pair of static contact terminals;

[0016] The leaf spring includes a base plate, the base plate is connected to the push rod assembly, and at least one spring arm is provided at each end of the base plate along the first direction; one end of each spring arm is connected to the base plate, and the other end is connected to the movable spring plate;

[0017] Before the push rod assembly moves to the transition position, the spring arm does not contact the push rod assembly; when the push rod assembly moves to the transition position and during the process of moving from the transition position to the overtravel end position, the spring arm abuts against the push rod assembly.

[0018] According to some embodiments of the present disclosure, a protrusion is further provided between one end of each spring arm and the base plate, the protrusion direction of the protrusion being away from the movable spring plate;

[0019] Wherein, before the push rod assembly moves to the transition position, the protrusion does not contact the push rod assembly; when the push rod assembly moves to the transition position and during the process of moving from the transition position to the overtravel end position, the protrusion abuts against the push rod assembly.

[0020] According to some embodiments of the present disclosure, the spring arm is bent from the protruding portion toward the movable spring piece, and the spring arms located on both sides of the base piece along the first direction extend in directions away from each other.

[0021] According to some embodiments of the present disclosure, the other end of the spring arm is provided with an abutment portion, and the abutment portion abuts against the movable spring piece;

[0022] There is a first distance between the abutting portions on both sides of the substrate along the first direction; there is a second distance between the protruding portions on both sides of the substrate along the first direction, and the first distance is greater than the second distance.

[0023] According to some embodiments of the present disclosure, the protrusion is formed by bending the leaf spring.

[0024] According to some embodiments of the present disclosure, the relay includes a plurality of the dynamic spring assemblies, each of the dynamic spring assemblies includes a dynamic spring leaf, and the multiple dynamic spring leaves of the plurality of the dynamic spring assemblies are arranged side by side along a third direction; wherein the movement direction of the dynamic spring leaf is defined as a second direction, and the first direction, the second direction, and the third direction are perpendicular to each other;

[0025] A plurality of spring arms are respectively provided on both sides of the substrate along the first direction, and the number of the spring arms on one side of the substrate corresponds to the number of the movable springs.

[0026] According to some embodiments of the present disclosure, the relay further includes:

[0027] A first magnetic conductor is provided on a side of the movable spring sheet facing away from the elastic component.

[0028] According to some embodiments of the present disclosure, the dynamic spring assembly further includes a second magnetic conductor, which is fixedly connected to a side of the dynamic spring piece facing the elastic assembly, and is used to form a magnetic circuit with the first magnetic conductor.

[0029] According to some embodiments of the present disclosure, the push rod assembly includes:

[0030] Rod;

[0031] The base is connected to one axial end of the rod; the base is provided with a boss facing the movable spring; and the elastic component is connected to a side surface of the boss facing away from the base.

[0032] According to some embodiments of the present disclosure, the relay further includes a pair of static contact terminals, and the two ends of the movable reed along a first direction are used to respectively contact or separate with the pair of static contact terminals; the first direction is the arrangement direction of the pair of static contact terminals;

[0033] The elastic component is a leaf spring; the leaf spring includes a base plate, and at least one spring arm is respectively provided at both ends of the base plate along the first direction; the base plate is provided with a limiting hole, and a protruding column is provided on the side surface of the boss facing away from the base, the protruding column is inserted into the limiting hole, and the side surface of the base plate facing away from the movable spring plate abuts against the side surface of the boss facing the movable spring plate; the end of the spring arm away from the base plate is connected to the movable spring plate.

[0034] According to some embodiments of the present disclosure, a protrusion is further provided between one end of each spring arm and the base plate, the protrusion direction of the protrusion being away from the movable spring plate;

[0035] The apex of the raised portion is lower than a surface of the boss facing the movable spring.

[0036] According to some embodiments of the present disclosure, a convex ring is provided on one surface of the substrate facing the movable spring, the convex ring surrounds the limiting hole, and the inner ring surface of the convex ring is flush with the hole wall of the limiting hole.

[0037] According to some embodiments of the present disclosure, the convex ring is formed by folding the edge of the limiting hole of the substrate toward the direction close to the movable spring.

[0038] According to some embodiments of the present disclosure, the convex ring is provided with a top surface facing away from the substrate, and a chamfer is provided at the connection between the top surface and the inner annular surface.

[0039] One embodiment of the above application has at least the following advantages or beneficial effects:

[0040] The relay of the disclosed embodiment designs the spring constant of the elastic component to be relatively low from the initial overtravel position to the transition position, and relatively high from the transition position to the end of overtravel. This results in a curve representing the relationship between the reaction force and the magnetic gap from the initial overtravel position to the end of overtravel being a broken line segment. This ensures that even when the coil power consumption is reduced, the suction force will not be less than the reaction force, thus ensuring reliable relay closure. Furthermore, because the spring constant of the elastic component is relatively high from the transition position to the end of overtravel, the reaction force is also relatively high when the push rod assembly moves relative to the movable spring to the end of overtravel, thereby increasing contact pressure.

[0041] Furthermore, while maintaining the coil power consumption constant, the spring rate of the elastic component can be increased, and the suction force will not be less than the output force. Therefore, the relay of the disclosed embodiment can increase the contact pressure while maintaining the coil power consumption constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and other features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

[0043] FIG1 is an exploded schematic diagram showing a relay according to an exemplary embodiment.

[0044] FIG2 is a schematic structural diagram of a relay according to an exemplary embodiment, in which a housing and an arc extinguishing unit are omitted.

[0045] FIG3 is a cross-sectional view along AA in FIG2 .

[0046] FIG4 is a cross-sectional view along line BB in FIG2 .

[0047] FIG5 is a graph showing the relationship between the suction force, the reaction force and the magnetic gap.

[0048] FIG6 is a schematic structural diagram of a leaf spring according to an exemplary embodiment.

[0049] FIG. 7 is a schematic diagram showing a moving assembly in which the contact support is omitted according to an exemplary embodiment, wherein the protrusion does not contact the base.

[0050] FIG8 is a partial enlarged view of point X1 in FIG7 .

[0051] FIG9 is a schematic diagram showing a moving assembly in which the contact support is omitted according to an exemplary embodiment, wherein the protrusion is in contact with the base.

[0052] FIG10 is a partial enlarged view of position X2 in FIG9 .

[0053] FIG. 11 is a schematic diagram of a moving assembly according to an exemplary embodiment.

[0054] FIG12 is a cross-sectional view taken along CC of FIG11 .

[0055] FIG13 is a partial enlarged view of position X3 in FIG12 .

[0056] FIG. 14 is an exploded schematic diagram showing the moving assembly and the second magnetic conductor according to the first exemplary embodiment.

[0057] FIG. 15 is an exploded schematic diagram showing a moving assembly and a second magnetic conductor according to a second exemplary embodiment.

[0058] FIG. 16 is an exploded schematic diagram showing a moving assembly and a second magnetic conductor according to a third exemplary embodiment.

[0059] FIG. 17 is a schematic diagram illustrating a moving assembly according to a fourth exemplary embodiment in which the contact holder is omitted, wherein the protrusion does not contact the base.

[0060] FIG. 18 is a schematic diagram illustrating a moving assembly according to a fifth exemplary embodiment in which the contact holder is omitted, wherein the protrusion does not contact the base.

[0061] FIG. 19 is a schematic diagram illustrating a sixth exemplary embodiment of a movable assembly in which the contact holder is omitted, wherein the protrusion does not contact the base.

[0062] The description of the accompanying drawings is as follows:

[0063] 1. Relay; 10. Housing; 11. First housing; 11a. Exposure hole; 12. Second housing; 20. Coil unit; 21. Coil frame; 22. Coil; 30. Arc extinguishing unit; 31. Arc extinguishing magnet; 32. Yoke clamp; 40. Sealing unit; 1000. Contact container; 1001. Contact chamber; 1002. First through hole; 1100. Insulation cover; 1110. Ceramic cover; 1111. Third through hole; 1120. Frame; 1200. Yoke plate; 1210. Second through hole; 2000. Static contact lead-out terminal; 3000. Moving assembly; 3100. Moving spring assembly; 3110. Moving spring plate; 3200. Push rod assembly; 3210. Push rod; 3211. Base; 3212. Rod; 3 213. Card; 3214. Boss; 3215. Boss; 3220. Contact bracket; 3221. Top wall; 3222. Side wall; 3223. Card hole; 3300. Elastic component; 4000. Magnetic circuit portion; 4300. Static iron core; 4310. Through hole; 4400. Moving iron core; 4500. Reset member; 5000. Metal cover; 6100. First magnetic conductor; 6200. Second magnetic conductor; 100. Leaf spring; 110. Base plate; 111. Limiting hole; 112. Protruding ring; 112a. Top surface; 112b. Inner annular surface; 113. Chamfer; 120. Spring arm; 121. Abutment portion; 130. Raised portion; 131. Vertex; 300. Connector; L1. First spacing; L2. Second spacing. DETAILED DESCRIPTION

[0064] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0065] In addition, the following will disclose embodiments of the present invention with reference to the accompanying drawings. For the purpose of clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the present invention.

[0066] Furthermore, for the sake of clutter, some conventional structures and components may be depicted in simplified schematic form in the drawings. Furthermore, some features in the drawings may be slightly enlarged or their proportions or dimensions altered to facilitate understanding and appreciation of the technical features of the present invention, but this is not intended to limit the present invention. The actual dimensions and specifications of products manufactured in accordance with the disclosure of this invention may be adjusted based on production requirements, product characteristics, and the following disclosures of this invention. This is hereby stated.

[0067] As shown in Figures 1 and 2, the relay 1 according to the embodiment of the present disclosure includes a housing 10, a coil unit 20, an arc extinguishing unit 30, and a sealing unit 40. The sealing unit 40 is disposed within the housing 10, with the top of the static contact lead-out terminal of the sealing unit 40 exposed to the outer surface of the housing 10 through an exposure hole 11a in the housing 10. The coil unit 20 and the arc extinguishing unit 30 are both disposed within the housing 10.

[0068] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present disclosure are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to the process, method, product, or apparatus.

[0069] As an example, the housing 10 includes a first shell 11 and a second shell 12, which are connected to form a chamber for accommodating the coil unit 20, the arc extinguishing unit 30, and the sealing unit 40. In the embodiment of the present disclosure, the exposure hole 11a is provided in the first shell 11.

[0070] The arc extinguishing unit 30 is used to extinguish the arc generated between the static contact lead-out terminal of the sealing unit 40 and the movable reed.

[0071] As an example, the arc extinguishing unit 30 includes two arc extinguishing magnets 31. The arc extinguishing magnets 31 can be permanent magnets, and each arc extinguishing magnet 31 can be substantially rectangular. The two arc extinguishing magnets 31 are respectively disposed on either side of the sealing unit 40 and are arranged opposite each other along the length direction of the movable spring.

[0072] By providing two arc-extinguishing magnets 31 disposed opposite to each other, a magnetic field can be formed around the static contact lead-out terminal and the movable spring. Therefore, the arc generated between the static contact lead-out terminal and the movable spring will be stretched away from each other by the action of the magnetic field, thereby achieving arc extinguishing.

[0073] The arc extinguishing unit 30 also includes two yoke clamps 32, which are arranged corresponding to the positions of the two arc extinguishing magnets 31. In addition, the two yoke clamps 32 surround the sealing unit 40 and the two arc extinguishing magnets 31. The design of the yoke clamps 32 surrounding the arc extinguishing magnets 31 can prevent the magnetic field generated by the arc extinguishing magnets 31 from spreading outward and affecting the arc extinguishing effect. The yoke clamps 32 are made of soft magnetic material. Soft magnetic materials may include but are not limited to iron, cobalt, nickel, and alloys thereof.

[0074] As shown in FIG. 3 and FIG. 4 , the sealing unit 40 includes a contact container 1000 , a pair of static contact lead terminals 2000 , a moving assembly 3000 , and a magnetic circuit portion 4000 .

[0075] It should be noted that the contact container 1000 is a stationary component, which is used to accommodate the contact group and is mainly a housing and has a cavity. In addition, the contact container 1000 can be formed by connecting multiple components in a predetermined assembly method.

[0076] The contact container 1000 has a contact chamber 1001 therein. The contact container 1000 may include an insulating cover 1100 and a yoke plate 1200 . The insulating cover 1100 is disposed on one side surface of the yoke plate 1200 . The insulating cover 1100 and the yoke plate 1200 together enclose the contact chamber 1001 .

[0077] The insulating cover 1100 includes a ceramic cover 1110 and a frame piece 1120. The ceramic cover 1110 is connected to the yoke iron plate 1200 via the frame piece 1120. The frame piece 1120 can be a metal piece with an annular structure, such as an iron-nickel alloy, and one end of the frame piece 1120 is connected to the opening edge of the ceramic cover 1110, for example, by laser welding, brazing, resistance welding, gluing, etc. The other end of the frame piece 1120 is connected to the yoke iron plate 1200, also by laser welding, brazing, resistance welding, gluing, etc. A frame piece 1120 is provided between the ceramic cover 1110 and the yoke iron plate 1200 to facilitate the connection between the ceramic cover 1110 and the yoke iron plate 1200.

[0078] 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 used to allow the static contact lead terminals 2000 to pass through. In the embodiment of the present disclosure, the first through holes 1002 are formed on the ceramic cover 1110 .

[0079] A pair of static contact lead-out terminals 2000 are connected to the ceramic cover 1110 of the contact container 1000, and at least a portion of each static contact lead-out terminal 2000 is located in the contact chamber 1001. One of the pair of static contact lead-out terminals 2000 serves as a terminal for current inflow, and the other serves as a terminal for current outflow.

[0080] A pair of static contact lead-out terminals 2000 are respectively disposed in the pair of first through holes 1002 and connected to the ceramic cover 1110 , for example, by welding.

[0081] The bottom of the static contact lead-out terminal 2000 serves as a static contact, and the static contact can be provided at the bottom of the static contact lead-out terminal 2000 in an integrated or split manner.

[0082] 3 and 4 , the dynamic assembly 3000 includes a plurality of dynamic spring assemblies 3100 , a push rod assembly 3200 , and an elastic assembly 3300 arranged side by side. The dynamic spring assembly 3100 is disposed in the insulating cover 1100 and is mounted on the push rod assembly 3200 via the elastic assembly 3300 .

[0083] It is understood that there may be one or more dynamic spring assemblies 3100. When there are multiple dynamic spring assemblies 3100, the multiple dynamic spring assemblies 3100 are arranged side by side, and the multiple dynamic spring assemblies 3100 form multiple contact points with each static contact terminal 2000, such as two, three, or four.

[0084] It should be noted that, if a pair of static contact lead terminals 2000 and a plurality of dynamic spring assemblies 3100 are regarded as a set of combinations, then the relay of the embodiment of the present disclosure may include multiple sets of combinations.

[0085] Each dynamic spring assembly 3100 includes a dynamic spring piece 3110, with multiple dynamic spring pieces 3110 arranged side by side. Each dynamic spring piece 3110, at either end along a first direction D1, is configured to engage with or disengage from a pair of stationary contact terminals 2000. The first direction D1 represents the arrangement direction of the pair of stationary contact terminals 2000.

[0086] Each movable spring piece 3110 may include a movable spring body and movable contacts disposed at both ends of the movable spring body. The movable contacts may be separate parts connected to the movable spring body. Of course, the movable contacts may also be integrally formed on the movable spring body.

[0087] In the disclosed embodiment, the movable assembly 3000 includes two side-by-side movable springs 3110. One end of each movable spring 3110 is used to contact or separate with the stationary contact of one of the stationary contact terminals 2000, while the other end of each movable spring 3110 is used to contact or separate with the stationary contact of the other stationary contact terminal 2000. Specifically, one end of each movable spring 3110 forms two contact points with one of the stationary contact terminals 2000, while the other end of each movable spring 3110 forms two contact points with the other stationary contact terminal 2000.

[0088] In other embodiments, the number of the movable reed pieces 3110 can also be one, three, four, five, etc.

[0089] It is understood that the dynamic assembly 3000 includes multiple dynamic reeds 3110, each of which contacts or separates from a pair of static contact leads at its ends along the first direction D1. Because the multiple dynamic reeds 3110 do not restrict each other, they form a reliable parallel circuit when contacted with a pair of static contact leads 2000 at their ends along the first direction D1. The number of contact points formed by the multiple dynamic reeds 3110 and a single static contact lead 2000 is greater than or equal to two, achieving a current shunting effect. Furthermore, based on the principle that the magnitude of the electrodynamic repulsive force is proportional to the square of the current, the magnitude of the electrodynamic repulsive force at each contact point is significantly reduced, which helps improve short-circuit resistance and enhances the reliability of the relay.

[0090] Each movable spring assembly 3100 further includes a second magnetic conductor 6200, which is fixedly connected to the side of the movable spring piece 3110 facing away from the static contact lead-out terminal 2000. The function of the second magnetic conductor 6200 will be described in detail below.

[0091] As shown in Figures 3 and 4, the direction of movement of the movable spring 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 the two side walls 3222 is integrally connected to the two side edges of the top wall 3221 along the third direction D3, and the other ends of the two side walls 3222 are connected to the push rod 3210, forming an inverted U-shaped structure. Multiple movable springs 3110 are installed in the space enclosed by the contact bracket 3220 via the elastic assembly 3300.

[0092] Each side wall 3222 of the contact support 3220 has a locking hole 3223 at its bottom end. The push rod 3210 includes a base 3211 and a rod portion 3212, with the base 3211 connected to one axial end of the rod portion 3212. Two locking clips 3213 are provided on either side of the base 3211. The two locking clips 3213 respectively snap into the two locking holes 3223 of the contact support 3220, securing the base 3211 to the contact support 3220. The elastic assembly 3300 is disposed between the multiple movable springs 3110 and the base 3211, and is used to apply an elastic force to the multiple movable springs 3110, causing them to move toward the top wall 3221, thereby providing contact pressure.

[0093] In other embodiments, the contact holder 3220 may also have other structures, which are not listed here one by one.

[0094] It is understandable that the elastic component 3300 can be used to flexibly support the multiple dynamic reeds 3110 to provide contact pressure.

[0095] Of course, in other embodiments, the push rod assembly 3200 may also adopt other structures, which will not be described here.

[0096] The plurality of movable springs 3110 are arranged side by side along the third direction D3.

[0097] Continuing with Figures 3 and 4 , the yoke plate 1200 has a second through-hole 1210 extending through two opposing sides of the yoke plate 1200 along its thickness. The second through-hole 1210 communicates with the contact chamber 1001 of the contact container 1000. A rod 3212 is axially movably disposed through the second through-hole 1210. A base 3211 at one axial end of the rod 3212 is disposed within the contact chamber 1001.

[0098] The sealing unit 40 further includes a metal cover 5000, which is connected to the side of the yoke plate 1200 facing away from the insulating cover 1100 and covers the second through hole 1210 in the yoke plate 1200. The metal cover 5000 and the yoke plate 1200 enclose a chamber for accommodating the static iron core 4300 and the movable iron core 4400 of the magnetic circuit portion 4000.

[0099] Referring back to FIG1 , the coil unit 20 includes a coil frame 21 and a coil 22 . The coil frame 21 is hollow and cylindrical and is made of insulating material. The metal cover 5000 is inserted into the coil frame 21 . The coil 22 surrounds the coil frame 21 .

[0100] As shown in Figures 3 and 4, the magnetic circuit part 4000 includes a static iron core 4300, a moving iron core 4400 and a reset member 4500. The static iron core 4300 is fixedly arranged in the metal cover 5000, and part of the static iron core 4300 extends into the second through hole 1210. The static iron core 4300 has a through hole 4310, and the through hole 4310 is arranged corresponding to the position of the second through hole 1210, for the rod portion 3212 to pass through it. The moving iron core 4400 is movably arranged in the metal cover 5000, and is arranged opposite to the static iron core 4300 along the axial direction of the rod portion 3212. The moving iron core 4400 is connected to the rod portion 3212, and is used to be attracted by the static iron core 4300 when the coil 22 is energized. The moving iron core 4400 and the rod portion 3212 can be connected by screwing, riveting, welding or other methods.

[0101] The reset member 4500 is located inside the metal cover 5000 and is arranged between the static iron core 4300 and the movable iron core 4400. It is used to reset the movable iron core 4400 when the coil 22 is powered off. The reset member 4500 can be a spring and is sleeved on the outside of the rod 3212.

[0102] It should be noted that when the coil 22 is energized, the stationary iron core 4300 attracts the movable iron core 4400 to move upward, and the movable iron core 4400 can drive the push rod assembly 3200 to move upward via the rod portion 3212. When the movable spring 3110 contacts the static contact lead 2000, the movable spring 3110 is stopped by the static contact lead 2000, while the rod portion 3212 and the base 3211 continue to move upward until the overtravel is completed.

[0103] During the overtravel process, the base 3211 squeezes the elastic component 3300 . After being squeezed, the elastic component 3300 can provide elastic force to the movable reed 3110 to provide contact pressure.

[0104] 3 and 4 , the relay 1 further comprises a first magnetic conductor 6100 , which is configured to generate a suction force on the movable reed 3110 in the direction of contact closure. This suction force is capable of resisting the electromotive repulsion between the movable reed 3110 and the static contact terminal 2000 due to the short-circuit current, thereby preventing the movable reed 3110 and the static contact terminal 2000 from bouncing apart.

[0105] In one embodiment, the first magnetic conductor 6100 is disposed on a side of the movable reed 3110 facing away from the elastic component 3300 . In other words, the first magnetic conductor 6100 is disposed on a side of the movable reed 3110 facing the static contact lead-out terminal 2000 .

[0106] It is understandable that when the movable spring piece 3110 is energized, the first magnetic conductor 6100 is magnetized, thereby generating a suction force on the movable spring piece 3110 in the direction of contact closure, thereby achieving the purpose of preventing short circuit.

[0107] Furthermore, the movable spring assembly 3100 may further include a second magnetic conductor 6200, which is fixedly connected to the side of the movable spring piece 3110 facing the elastic assembly 3300. In other words, the second magnetic conductor 6200 is fixedly connected to the side of the movable spring piece 3110 facing away from the static contact lead-out terminal 2000. The second magnetic conductor 6200 is used to form a magnetic conductive circuit with the first magnetic conductor 6100.

[0108] The number of second magnetic conductors 6200 corresponds to the number of movable springs 3110. In the embodiment of the present disclosure, the number of second magnetic conductors 6200 is two, but the present invention is not limited thereto. The two second magnetic conductors 6200 are respectively fixedly connected to the side of the two movable springs 3110 facing away from the static contact lead-out terminal 2000.

[0109] When the two ends of the movable spring 3110 contact the pair of stationary contact leads 2000, current flows through the movable spring 3110, forming a magnetic circuit around the movable spring 3110 between the first and second magnetic conductors 6100, 6200. When a short-circuit current flows through the movable spring 3110, an attractive force is generated between the first and second magnetic conductors 6100, 6200 in the direction of contact pressure. This attractive force counteracts the electrodynamic repulsion between the movable spring 3110 and the stationary contact leads 2000 caused by the short-circuit current, preventing the movable spring 3110 and the stationary contact leads 2000 from bouncing apart.

[0110] It is understood that the first magnetic conductor 6100 and the second magnetic conductor 6200 may be in the shape of a straight line or a U. The first magnetic conductor 6100 and the second magnetic conductor 6200 may be made of soft magnetic materials such as iron, cobalt, nickel, and alloys thereof.

[0111] As shown in Figures 3 and 4 , the first magnetic conductor 6100 is disposed within the contact container 1000 and is fixed relative to the contact container 1000. This transfers the short-circuit-resistant suction force to the contact container 1000. Because the contact container 1000 is a stationary component, there is no need for excessive retention force on the coil 22. This reduces the power consumption of the coil 22 of the relay 1 and the size of the relay 1, thereby improving the short-circuit resistance.

[0112] Furthermore, the first magnetic conductor 6100 is connected to the ceramic cover 1110 of the insulating cover 1100 via a connector 300. The ceramic cover 1110 of the insulating cover 1100 has a third through hole 1111. The connector 300 is rod-shaped and extends through the third through hole 1111. One end of the connector 300 is connected to the insulating cover 1100, and the other end is connected to the first magnetic conductor 6100.

[0113] The connection between one axial end of the connector 300 and the ceramic cover 1110 can be implemented in various ways, such as welding, riveting, screwing, bonding, etc. The connection between the other end of the connector 300 and the first magnetic conductor 6100 can also be implemented in various ways, such as welding, riveting, screwing, bonding, clamping, etc.

[0114] It can be understood that when one end of the connector 300 is connected to the ceramic cover 1110 by welding, by welding the connector 300 to the top wall of the ceramic cover 1110, the metallization layer can be processed only on the periphery of the third through hole 1111 on the outer wall surface of the top wall, without the need to process the metallization layer on the inner wall surface of the top wall, which facilitates processing and simplifies the processing steps.

[0115] It is understandable that one end of the connector 300 may be connected to the outer wall of the ceramic cover 1110 , or to the inner wall of the ceramic cover 1110 , or to both the outer and inner walls of the ceramic cover 1110 .

[0116] It can be seen from this that the first magnetic conductor 6100 is connected to the ceramic cover 1110 through the connecting piece 300. On the one hand, the anti-short circuit suction force is transferred to the ceramic cover 1110, so there is no need for too much holding force of the coil 22, thereby reducing the power consumption of the coil 22 of the relay 1 and the volume of the relay 1, and improving the short circuit resistance; on the other hand, since the connecting piece 300 is connected to the ceramic cover 1110, it will not occupy too much space in the contact chamber 1001, thereby ensuring the arc extinguishing space of the arc extinguishing assembly and the activity space of the push rod 3210.

[0117] In addition, the first magnetic conductor 6100 is connected to the rod-shaped connecting member 300, so that a variety of connection methods can be used between the first magnetic conductor 6100 and the connecting member 300, such as riveting, laser welding, clamping, gluing, etc., which enriches the connection methods.

[0118] As an example, the connector 300 is a solid rod. In this way, the connector 300 and the first magnetic conductor 6100 can be connected by riveting, making the connection more reliable. In addition, the solid rod has higher support strength and is less prone to deformation.

[0119] Of course, the first magnetizer 6100 can also be fixed in the contact container 1000 by a fixing bracket (not shown). Specifically, the fixing bracket is disposed in the contact container 1000 and fixedly connected to the yoke plate 1200, and the first magnetizer 6100 is fixedly connected to the fixing bracket.

[0120] In addition, the first magnetic conductor 6100 may also be fixedly connected to the inner side of the top wall 3221 of the contact bracket 3220 to form a follow-up anti-short circuit structure.

[0121] In another embodiment, the distance between the first and second magnetizers 6100, 6200, can be designed to be variable. Specifically, the distance between the first and second magnetizers 6100, 6200 can be adjusted based on the current, thereby varying the magnetic attraction between the first and second magnetizers 6100, 6200. This ensures both short-circuit protection and overload disconnection.

[0122] Optionally, the first magnetic conductor 6100 may include multiple stacked magnetic conductive sheets. It will be appreciated that increasing the number of thinner magnetic conductive sheets can increase the overall thickness of the first magnetic conductor 6100. On the one hand, thinner magnetic conductive sheets can be made from thin strips, resulting in lower material costs and easier handling. On the other hand, the number of magnetic conductive sheets can be flexibly adjusted based on the magnitude of the short-circuit current.

[0123] It is understood that the process of switching relay 1 from fully open to fully closed can be divided into two stages: the first stage is when the movable iron core 4400 drives the movable spring 3110 upward through the push rod assembly 3200 until the movable spring 3110 just contacts the static contact lead 2000. During the first stage, the suction force provided by the static iron core 4300 to the movable iron core 4400 slowly increases and must always be greater than the sum of the elastic force provided by the reset member 4500 and the weight of the push rod assembly 3200 and the movable iron core 4400. The second stage is when the movable spring 3110 contacts the static contact lead 2000, the movable iron core 4400 does not stop moving. Instead, the movable iron core 4400 continues to drive the push rod assembly 3200 upward until the movable iron core 4400 contacts the static iron core 4300 (the second stage is the overtravel process). During the second stage, the elastic assembly 3300 is squeezed by the push rod assembly 3200 and is able to provide elastic force. Therefore, the suction force provided by the static iron core 4300 to the movable iron core 4400 needs to be greater than the sum of the elastic force provided by the reset member 4500, the push rod assembly 3200, the weight of the movable iron core 4400 itself, and the elastic force provided by the elastic assembly 3300.

[0124] For easier understanding, further explanation can be provided in conjunction with Figure 5. It should be noted that Figure 5 shows a graph of the relationship between the suction force and the reaction force and the magnetic gap. Curve 1 represents the relationship between the suction force and the magnetic gap, and Curve 2 represents the relationship between the reaction force and the magnetic gap of the conventional relay 1.

[0125] As shown in Figure 5, during the entire process of relay 1 switching from fully open to fully closed, the suction force increases exponentially as the magnetic gap between the static iron core 4300 and the movable iron core 4400 gradually decreases. The change in the reaction force can be divided into two stages. Before the movable spring 3110 contacts the static contact terminal 2000, the reaction force consists solely of the elastic force provided by the reset element 4500 and the weight of the push rod assembly 3200 and the movable iron core 4400. As the magnetic gap gradually decreases, once the movable spring 3110 contacts the static contact terminal 2000, the elastic force provided by the elastic assembly 3300 also contributes to the reaction force. Therefore, curve 2, representing the reaction force, has a turning point where the reaction force suddenly increases.

[0126] It can be further seen from FIG5 that no matter what the size of the magnetic gap is, the suction force must always be greater than the reaction force.

[0127] As described in the background art, if the contact pressure is to be increased, the power consumption and volume of the coil need to be increased, which contradicts the current development trend of low power consumption and small volume of coils.

[0128] Furthermore, as shown in Figure 5, curve 3 shows the relationship between the suction force and the magnetic gap after the coil power consumption is reduced. If the contact pressure is maintained constant and the coil power consumption is directly reduced (reduced coil power consumption reduces the suction force), then at some point during the entire contact closing process, the suction force will be less than the reaction force (i.e., the suction force and reaction force do not match), causing Relay 1 to fail to close.

[0129] It can be seen that in the prior art, contact pressure and coil power consumption cannot be taken into account at the same time, which obviously affects the development of the relay 1.

[0130] Based on this, an embodiment of the present disclosure provides a relay 1, in which the stiffness coefficient of the elastic component 3300 is designed to be variable, which reduces the power consumption of the coil without affecting the matching of the suction and reaction forces, and can also ensure a sufficiently large contact pressure.

[0131] During the overtravel process, the push rod assembly 3200 squeezes the elastic assembly 3300 and has an overtravel initial position, an overtravel end position, and a transition position between the overtravel initial position and the overtravel end position relative to the dynamic reed 3110 .

[0132] In which, when the push rod assembly 3200 moves from the initial position of the overtravel to the transition position, the elastic assembly 3300 has a first stiffness coefficient; when the push rod assembly 3200 moves from the transition position to the end position of the overtravel, the elastic assembly 3300 has a second stiffness coefficient, and the first stiffness coefficient is smaller than the second stiffness coefficient.

[0133] It should be noted that the overtravel initial position refers to the position of the push rod assembly 3200 relative to the movable reed 3110 when the push rod assembly 3200 drives the movable reed 3110 to just contact the static contact lead-out end 2000; the overtravel end position refers to the position of the push rod assembly 3200 relative to the movable reed 3110 after the movable iron core 4400 contacts the static iron core 4300 (that is, the magnetic gap is equal to zero).

[0134] In the embodiment of the present disclosure, before the push rod assembly 3200 moves from the overtravel initial position to the transition position relative to the dynamic reed 3110, the elastic assembly 3300 has a first stiffness coefficient. During the process of the push rod assembly 3200 moving from the transition position to the overtravel end position relative to the dynamic reed 3110, the elastic assembly 3300 has a second stiffness coefficient. Since the first stiffness coefficient is smaller than the second stiffness coefficient, during the overtravel process in which the push rod assembly 3200 squeezes the elastic assembly 3300, the relationship curve between the reaction force and the magnetic gap is a broken line (such as curve 4 in Figure 5).

[0135] It should be noted that the first half of curve 4 (i.e., the stage before the push rod assembly 3200 drives the moving spring 3110 to move and contacts the static contact lead end 2000) coincides with the first half of curve 2. Therefore, in the following description of curve 4, only the differences between curve 4 and curve 2 are introduced, and the part overlapping with curve 2 is not repeated.

[0136] As shown in FIG5 , in the prior art, when the push rod assembly 3200 is at the initial overtravel position, it corresponds to point A of curve 2 ; when the push rod assembly 3200 is at the end overtravel position, it corresponds to point B of curve 2 .

[0137] In the embodiment of the present disclosure, when the push rod assembly 3200 is at the initial position of the overtravel, it corresponds to point A' of curve 4 (A' coincides with A); when the push rod assembly 3200 is at the end position of the overtravel, it corresponds to point B' of curve 4, wherein the reaction force corresponding to point B' is greater than the reaction force corresponding to point B; when the push rod assembly 3200 is at the transition position, it corresponds to point C of curve 4.

[0138] Thus, the curve of the relationship between the reaction force and the magnetic gap in the prior art is a straight line segment AB, while the curve of the relationship between the reaction force and the magnetic gap in the embodiment of the present disclosure is a broken line segment A'CB'. The slope of the A'C segment is smaller than the slope of the AB segment, and the slope of the AB segment is smaller than the slope of the CB' segment.

[0139] In the embodiment of the present disclosure, since the slope of the A'C segment is smaller than the slope of the AB segment, and the slope of the CB' segment is larger than the slope of the AB segment, curve 3 does not intersect with A'CB', but curve 3 is always located above curve 4. Therefore, during the entire process of contact closure, the suction force will not be smaller than the reaction force (i.e., the suction force and the reaction force do not match).

[0140] Thus, it can be seen that the relay 1 of the embodiment of the present disclosure designs the spring constant of the elastic component 3300 to be smaller from the initial overtravel position to the transition position, and designs the spring constant of the elastic component 3300 to be larger from the transition position to the end of overtravel. This makes the curve of the relationship between the reaction force and the magnetic gap from the initial overtravel position to the end of overtravel a broken line segment. This ensures that even when the power consumption of the coil is reduced, the suction force will not be less than the reaction force, thereby ensuring the reliable closure of the relay 1. At the same time, because the spring constant of the elastic component 3300 is larger from the transition position to the end of overtravel, when the push rod assembly 3200 moves relative to the movable reed 3110 to the end of overtravel, the reaction force is also larger, thereby increasing the contact pressure.

[0141] Furthermore, referring to Figure 5, if the coil power consumption remains unchanged, that is, the relationship curve between the suction force and the magnetic gap remains Curve 1, then, provided that the suction force is greater than the reaction force, Curve 4 can be shifted upward, thereby increasing the reaction force. Therefore, the relay 1 of the present disclosure can increase the reaction force, thereby increasing the contact pressure, while maintaining the coil power consumption unchanged.

[0142] As shown in Figures 6 to 10, the elastic assembly 3300 is a leaf spring 100, which is connected to the movable spring 3110 and the push rod assembly 3200. The leaf spring 100 includes a base 110 and a spring arm 120. The base 110 is connected to the base 3211 of the push rod assembly 3200. At least one spring arm 120 is provided at each end of the base 110 along the first direction D1. One end of each spring arm 120 is connected to the base 110 and the other end is connected to the movable spring 3110. Before the push rod assembly 3200 moves to the transition position, the spring arm 120 does not contact the push rod assembly 3200. However, when the push rod assembly 3200 moves to the transition position and during the process of moving from the transition position to the overtravel end position, the spring arm 120 abuts the push rod assembly 3200.

[0143] It can be understood that when the spring arm 120 is not in contact with the push rod assembly 3200, the force arm of the spring arm 120 is longer and the stiffness coefficient is smaller; when the spring arm 120 is in contact with the push rod assembly 3200, the force arm of the spring arm 120 becomes smaller and the stiffness coefficient becomes larger.

[0144] As shown in FIG6 to FIG10 , in one embodiment, a protrusion 130 is further provided between one end of each spring arm 120 and the base plate 110 , the protrusion facing away from the movable spring piece 3110 , and the other end of each spring arm 120 abuts against the movable spring piece 3110 .

[0145] Before the push rod assembly 3200 moves to the transition position, the protrusion 130 does not contact the push rod assembly 3200; when the push rod assembly 3200 moves to the transition position and during the process of moving from the transition position to the overtravel end position, the protrusion 130 abuts against the push rod assembly 3200.

[0146] It can be understood that when the protrusion 130 does not contact the push rod assembly 3200, the force arm of the spring arm 120 is longer, and the stiffness coefficient is smaller; when the protrusion 130 abuts the push rod assembly 3200, the force arm of the spring arm 120 becomes smaller, and the stiffness coefficient becomes larger.

[0147] The spring arms 120 bend from the raised portion 130 toward the movable spring piece 3110, and the spring arms 120 on either side of the base plate 110 along the first direction D1 extend away from each other. An abutment portion 121 is provided at the other end of the spring arm 120, abutting against the movable spring piece 3110. A first distance L1 is defined between the abutment portions 121 on either side of the base plate 110 along the first direction D1. A second distance L2 is defined between the raised portions 130 on either side of the base plate 110 along the first direction D1, with the first distance L1 being greater than the second distance L2. The spring arms 120 on either side of the base plate 110 are symmetrically arranged along the first direction D1, and the raised portions 130 on either side of the base plate 110 are symmetrically arranged along the first direction D1.

[0148] Of course, in another embodiment, the spring constant of the spring arm 120 can be changed by not providing the protrusion 130 between one end of each spring arm 120 and the base plate 110, but providing a protrusion on the surface of the base 3211 facing the leaf spring 100. Before the push rod assembly 3200 moves to the transition position, the protrusion is not in contact with the leaf spring 100. At this time, the moment arm of the leaf spring 100 is long and the spring constant is low. When the push rod assembly 3200 moves to the transition position and during the process of moving from the transition position to the overtravel end position, the protrusion contacts the leaf spring 100. At this time, the moment arm of the leaf spring 100 becomes short and the spring constant becomes high.

[0149] As shown in Figures 11 and 12, the base 3211 is provided with a boss 3215 facing the movable spring 3110. The base 110 of the elastic assembly 3300 is connected to the side of the boss 3215 facing away from the base 3211. The base 110 is provided with a retaining hole 111. The side of the boss 3215 facing away from the base 3211 is provided with a protruding post 3214. The protruding post 3214 is inserted into the retaining hole 111, and the side of the base 110 facing away from the movable spring 3110 abuts against the side of the boss 3215 facing the movable spring 3110.

[0150] The shape of the limiting hole 111 can have various embodiments. When the substrate 110 has one limiting hole 111, the limiting hole 111 can be a non-circular shape such as a rectangle, ellipse, or triangle, which can prevent the base 3211 and the substrate 110 from rotating relative to each other, thereby achieving an anti-rotation effect. When the substrate 110 has two or more (including two) limiting holes 111, the limiting holes 111 can be circular or non-circular in shape.

[0151] As shown in Figures 6 and 13, a raised ring 112 is provided on the side of the substrate 110 facing the movable spring 3110. The raised ring 112 surrounds the limiting hole 111, and the inner annular surface 112b of the raised ring 112 is flush with the wall of the limiting hole 111. Furthermore, the raised ring 112 is formed by folding the edge of the limiting hole 111 of the substrate 110 toward the movable spring 3110.

[0152] By providing a protruding ring 112 on the edge of the limiting hole 111 , the friction between the protruding column 3214 and the substrate 110 can be reduced when the substrate 110 and the base 3211 are assembled, and the generation of scraps can be prevented.

[0153] The raised ring 112 has a top surface 112a facing away from the substrate 110. The junction between the top surface 112a and the inner annular surface 112b is provided with a chamfer 113. Providing the chamfer 113 at the junction between the top surface 112a and the inner annular surface 112b eliminates burrs generated during the molding process of the raised ring 112 and further prevents the generation of scraping debris between the boss 3214 and the inner annular surface 112b of the raised ring 112.

[0154] As shown in Figures 7 and 9, the apex 131 of the protrusion 130 is lower than the side surface of the boss 3215 facing the movable spring 3110. In other words, the distance between the apex 131 of the protrusion 130 and the side surface of the movable spring 3110 facing the base 3211 is greater than the distance between the two facing surfaces of the boss 3215 and the movable spring 3110.

[0155] In the embodiment of the present disclosure, as shown in Figure 7, before the push rod assembly 3200 moves from the over-travel initial position to the transition position relative to the movable spring 3110, the protrusion 130 is not in contact with the base 3211 of the push rod assembly 3200. At this time, the vertical distance from the line of action of the reaction force of the movable spring 3110 on the leaf spring 100 to the contact position between the base 110 and the boss 3215 is L3. Therefore, before the push rod assembly 3200 moves from the over-travel initial position to the transition position, the force arm of the movable spring 3110 on the leaf spring 100 is L3.

[0156] As shown in FIG9 , during the movement of the push rod assembly 3200 relative to the movable spring 3110 from the transition position to the overtravel end position, the protrusion 130 abuts against the base 3211. At this time, the vertical distance between the line of action of the reaction force exerted by the movable spring 3110 on the leaf spring 100 and the abutment position of the protrusion 130 and the base 3211 is L4. Therefore, during the movement of the push rod assembly 3200 from the transition position to the overtravel end position, the moment arm exerted by the movable spring 3110 on the leaf spring 100 is L4. L4 is smaller than L3.

[0157] As described above, the contact portions 121 on both sides of the substrate 110 along the first direction D1 have a first distance L1 between them, and the protrusions 130 on both sides of the substrate 110 along the first direction D1 have a second distance L2 between them. Therefore, L3 is equal to L1 / 2, and L4 is equal to (L1-L2) / 2.

[0158] In one embodiment, the protrusion 130 is formed by bending the leaf spring 100 , but the present invention is not limited thereto.

[0159] As shown in FIG14 , a plurality of spring arms 120 are provided on both sides of the substrate 110 along the first direction D1. The number of the spring arms 120 on one side of the substrate 110 corresponds to the number of the movable spring pieces 3110 , and the other ends of the spring arms 120 are respectively in contact with one end of the movable spring pieces 3110 .

[0160] In a specific embodiment, the number of the movable spring pieces 3110 and the number of the second magnetic conductors 6200 are both two, two spring arms 120 are respectively provided on both sides of the substrate 110 along the first direction D1, and the two spring arms 120 on one side of the substrate 110 are arranged side by side along the third direction D3.

[0161] Of course, in another embodiment, there are multiple leaf springs 100, and the number of leaf springs 100 corresponds to the number of movable springs 3110. Each leaf spring 100 has a spring arm 120 on both sides of the base 110 along the first direction D1, and one leaf spring 100 corresponds to one movable spring 3110.

[0162] As shown in FIG15 , the similarities between the second embodiment and the first embodiment are not repeated here, and the differences between the second embodiment and the first embodiment are as follows:

[0163] The number of the movable spring piece 3110 and the number of the second magnetic conductor 6200 are both one, and a spring arm 120 is provided on each side of the base plate 110 along the first direction D1.

[0164] As shown in FIG16 , the similarities between the third embodiment and the first embodiment are not repeated here, and the differences between the third embodiment and the first embodiment are as follows:

[0165] There are three movable spring pieces 3110 and three second magnetic conductors 6200 , and three spring arms 120 are respectively provided on both sides of the substrate 110 along the first direction D1 .

[0166] As shown in FIG17 , the fourth embodiment is similar to the first embodiment and is not described in detail. The difference between the fourth embodiment and the first embodiment is as follows:

[0167] The end of the spring arm 120 of the leaf spring 100 away from the base plate 110 is connected to the movable spring 3110 via an anti-rotation structure. The anti-rotation structure is used to limit the relative rotation between the leaf spring 100 and the movable spring 3110 around the axis of the push rod assembly 3200.

[0168] In one embodiment, the anti-rotation structure may be a combination of a limiting hole and a limiting protrusion; in another embodiment, the anti-rotation structure may also be a riveted structure, and the end of the spring arm 120 away from the substrate 110 is riveted to the movable spring piece 3110; in yet another embodiment, the anti-rotation structure may also be a welded structure, and the end of the spring arm 120 away from the substrate 110 is welded to the movable spring piece 3110.

[0169] In addition, the shape of the leaf spring 100 of the fourth embodiment is also different from that of the leaf spring 100 of the first embodiment. In this embodiment, the ends of the spring arms 120 on both sides of the base plate 110 along the first direction D1 converge toward the center.

[0170] As shown in FIG18 , the similarities between the fifth embodiment and the fourth embodiment are not repeated here. The differences between the fifth embodiment and the fourth embodiment are as follows:

[0171] The leaf spring 100 of the fifth embodiment has a different shape from the leaf spring 100 of the fourth embodiment. In this embodiment, the bending path of the spring arm 120 is arc-shaped, and the spring arm 120 is connected to the second magnetic conductor 6200 .

[0172] The first distance L1 is not greater than the second distance L2.

[0173] As shown in FIG19 , the sixth embodiment is similar to the fourth embodiment and is not described in detail. The difference between the sixth embodiment and the fourth embodiment is as follows:

[0174] The leaf spring 100 is mounted on the movable spring piece 3110 , and the base plate 110 of the leaf spring 100 abuts against a surface of the boss 3215 facing the movable spring piece 3110 .

[0175] It is understandable that the various embodiments / implementations provided in the present disclosure can be combined with each other without causing any contradiction, and they will not be illustrated one by one here.

[0176] In the application examples, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the application examples can be understood according to the specific circumstances.

[0177] In the description of the application embodiments, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the application embodiments and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the application embodiments.

[0178] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the claimed invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0179] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A relay, characterized in that: include: Push rod assembly; A dynamic spring assembly, including a dynamic spring leaf; An elastic component, connected to the dynamic spring component and the push rod component, the elastic component is used to provide contact pressure to the dynamic spring piece; Wherein, during the overtravel process, the push rod assembly squeezes the elastic assembly, and the position relative to the movable spring sheet has an overtravel initial position, an overtravel end position, and a transition position between the overtravel initial position and the overtravel end position; Wherein, when the push rod assembly moves from the overtravel initial position to the transition position, the elastic assembly has a first stiffness coefficient; when the push rod assembly moves from the transition position to the overtravel end position, the elastic assembly has a second stiffness coefficient, and the first stiffness coefficient is smaller than the second stiffness coefficient.

2. The relay according to claim 1, characterized in that: The elastic component is a leaf spring, and the leaf spring is connected to the dynamic spring component and the push rod component.

3. The relay according to claim 2, characterized in that: The relay further comprises a pair of static contact lead-out terminals, and the two ends of the movable reed along the first direction are used to contact or separate from the pair of static contact lead-out terminals respectively; the first direction is the arrangement direction of the pair of static contact lead-out terminals; The leaf spring comprises a base plate, the base plate is connected to the push rod assembly, and at least one spring arm is respectively provided at both ends of the base plate along the first direction; one end of each spring arm is connected to the base plate, and the other end is connected to the movable spring leaf; Wherein, before the push rod assembly moves to the transition position, the spring arm does not contact the push rod assembly; when the push rod assembly moves to the transition position and during the process of moving from the transition position to the over-travel end position, the spring arm abuts against the push rod assembly.

4. The relay according to claim 3, characterized in that: A protrusion is also provided between one end of each spring arm and the base sheet, the protrusion direction of which is away from the movable spring sheet; Wherein, before the push rod assembly moves to the transition position, the protrusion does not contact the push rod assembly; when the push rod assembly moves to the transition position and during the process of moving from the transition position to the over-travel end position, the protrusion abuts against the push rod assembly.

5. The relay according to claim 4, characterized in that: The spring arms are bent from the protruding portion toward the direction approaching the movable spring sheet, and the spring arms located at both sides of the base sheet along the first direction extend in directions away from each other.

6. The relay according to claim 4, characterized in that: The other end of the spring arm is provided with an abutment portion, and the abutment portion abuts against the movable spring piece; There is a first distance between the abutting portions located on both sides of the substrate along the first direction; There is a second interval between the protrusions located on both sides of the substrate along the first direction, and the first interval is greater than the second interval.

7. The relay according to claim 4, characterized in that: The protrusion is formed by bending the leaf spring.

8. The relay according to claim 3, characterized in that: The relay comprises a plurality of the dynamic spring assemblies, each of the dynamic spring assemblies comprises a dynamic spring sheet, and the dynamic spring sheets of the plurality of dynamic spring assemblies are arranged side by side along a third direction; wherein the movement direction of the dynamic spring sheet is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other; The substrate is provided with a plurality of spring arms on both sides along the first direction, and the number of the plurality of spring arms on one side of the substrate is the same as The number of the plurality of movable springs corresponds.

9. The relay according to claim 1, characterized in that: The relay further comprises: A first magnetic conductor is arranged on a side of the movable spring sheet facing away from the elastic component.

10. The relay according to claim 9, characterized in that: The movable spring assembly further includes a second magnetic conductor, which is fixedly connected to a side of the movable spring piece facing the elastic assembly, and the second magnetic conductor is used to form a magnetic circuit with the first magnetic conductor.

11. The relay according to claim 1, characterized in that: The push rod assembly comprises: Rod; The base is connected to one axial end of the rod; the base is provided with a boss facing the movable spring; and the elastic component is connected to a side surface of the boss facing away from the base.

12. The relay according to claim 11, characterized in that: The relay further comprises a pair of static contact lead-out terminals, and the two ends of the movable reed along the first direction are used to contact or separate from the pair of static contact lead-out terminals respectively; the first direction is the arrangement direction of the pair of static contact lead-out terminals; The elastic component is a leaf spring; the leaf spring comprises a base plate, and at least one spring arm is respectively provided at both ends of the base plate along the first direction; the base plate is provided with a limiting hole, and a convex column is convexly provided on a side surface of the boss facing away from the base, the convex column is inserted into the limiting hole, and a side surface of the base plate facing away from the movable spring plate abuts against a side surface of the boss facing the movable spring plate; One end of the spring arm away from the substrate is connected to the movable spring.

13. The relay according to claim 12, characterized in that: A protrusion is also provided between one end of each spring arm and the base sheet, the protrusion direction of which is away from the movable spring sheet; The apex of the protrusion is lower than a surface of the boss facing the movable spring.

14. The relay according to claim 12, characterized in that: A convex ring is provided on a surface of one side of the base plate facing the movable spring sheet, the convex ring surrounds the limiting hole, and the inner ring surface of the convex ring is flush with the hole wall of the limiting hole.

15. The relay according to claim 14, characterized in that: The convex ring is formed by folding the edge of the limiting hole of the substrate toward the direction close to the movable spring sheet.

16. The relay according to claim 14, characterized in that The convex ring is provided with a top surface facing away from the substrate, and a chamfer is provided at a connection between the top surface and the inner ring surface.

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