relay

Abstract

The application discloses a relay, which comprises a push rod assembly, a moving spring assembly and an elastic assembly. The moving spring assembly comprises a moving spring leaf, and the elastic assembly is connected to the moving spring assembly and the push rod assembly and is used for providing contact pressure to the moving spring leaf. During overstroke, the push rod assembly extrudes the elastic assembly, and the position of the push rod assembly relative to the moving spring leaf has an overstroke initial position, an overstroke end position and a transition position between the overstroke initial position and the overstroke end position. During movement of the push rod assembly from the overstroke initial position to the transition position, the elastic assembly has a first stiffness coefficient. During movement of the push rod assembly from the transition position to the overstroke end position, the elastic assembly has a second stiffness coefficient, and the first stiffness coefficient is smaller than the second stiffness coefficient.

Description

Technical Field

[0001] This application relates to the field of electronic control device technology, and more specifically, to a relay. Background Technology

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is commonly used in automatic control circuits. Essentially, a relay is an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] A high-voltage DC relay is a type of relay. Existing high-voltage DC relays include a pair of stationary contact leads, a moving assembly, a coil unit, and a magnetic circuit. The moving assembly includes a moving spring, a push rod assembly, and an elastic assembly. The moving spring is mounted on the push rod assembly via the elastic assembly. The magnetic circuit includes a stationary iron core and a moving iron core. The stationary iron core is fixedly disposed within the relay, and the moving iron core is connected to the push rod assembly. When the coil unit is energized, the stationary iron core generates a magnetic force that attracts the moving iron core, thereby driving the push rod assembly and the moving spring to move together, thus closing the contacts.

[0004] In existing technologies, to ensure a good electrical connection between moving and stationary contacts, the contact pressure is typically increased, i.e., the elastic force of the elastic component is enhanced. However, increasing the elastic force of the elastic component requires increasing the power consumption of the coil unit, which contradicts the current trend of pursuing small size and low power consumption in coil units. Summary of the Invention

[0005] This application provides a relay that, by changing the stiffness coefficient of the elastic component, reduces coil power consumption while ensuring sufficient contact pressure, thus solving the technical problems existing in the prior art.

[0006] The relay in this application embodiment includes:

[0007] Push rod assembly;

[0008] The moving spring assembly includes the moving spring leaf;

[0009] An elastic component, connected to the movable spring assembly and the push rod assembly, is used to provide contact pressure to the movable spring sheet;

[0010] During the overtravel process, the push rod assembly compresses the elastic component 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 position of the moving spring.

[0011] During the movement of the push rod assembly from the initial overtravel position to the transition position, the elastic component has a first stiffness coefficient; during the movement of the push rod assembly from the transition position to the end of the overtravel position, the elastic component has a second stiffness coefficient, and the first stiffness coefficient is smaller than the second stiffness coefficient.

[0012] According to some embodiments of this application, the elastic component is a leaf spring, which is connected to the moving spring assembly and the push rod assembly.

[0013] According to some embodiments of this application, the relay further includes a pair of stationary contact leads, and the two ends of the moving spring along a first direction are respectively used to contact or separate from the pair of stationary contact leads; the first direction is the arrangement direction of the pair of stationary contact leads;

[0014] The leaf spring includes a base plate and a spring arm. The base plate is connected to the push rod assembly. 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 leaf spring.

[0015] 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.

[0016] According to some embodiments of this application, each of the spring arms is further provided with a protrusion facing away from the moving spring between one end and the substrate;

[0017] 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.

[0018] According to some embodiments of this application, the spring arm bends from the protrusion toward the moving spring, and the spring arms located on both sides of the substrate along the first direction extend in directions away from each other.

[0019] According to some embodiments of this application, the other end of the spring arm is provided with an abutment portion, which abuts against the movable spring sheet;

[0020] A first spacing is provided between the abutting portions located on both sides of the substrate along the first direction; a second spacing is provided between the protrusions located on both sides of the substrate along the first direction, wherein the first spacing is greater than the second spacing.

[0021] According to some embodiments of this application, the protrusion is formed by bending the leaf spring.

[0022] According to some embodiments of this application, the relay includes a plurality of said moving spring assemblies, each said moving spring assembly including a moving spring plate, and the plurality of moving spring plates are arranged side by side along a third direction; wherein, the movement direction of the moving spring plate is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other;

[0023] 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 corresponds to the number of the plurality of movable springs.

[0024] According to some embodiments of this application, the relay further includes:

[0025] A first magnetic conductor is disposed on the side of the movable spring facing away from the elastic component.

[0026] According to some embodiments of this application, the moving spring assembly further includes a second magnetic conductor, which is fixedly connected to the side of the moving spring facing the elastic assembly, and the second magnetic conductor is used to form a magnetic circuit with the first magnetic conductor.

[0027] According to some embodiments of this application, the push rod assembly includes:

[0028] rod section;

[0029] A base is connected to one axial end of the rod; the base has a boss facing the movable spring; the elastic component is connected to the side surface of the boss facing away from the base.

[0030] According to some embodiments of this application, the relay further includes a pair of stationary contact leads, and the two ends of the moving spring along a first direction are respectively used to contact or separate from the pair of stationary contact leads; the first direction is the arrangement direction of the pair of stationary contact leads;

[0031] The elastic component is a leaf spring; the leaf spring includes a base plate and a spring arm, and at least one spring arm is provided at each end of the base plate along the first direction; the base plate is provided with a limiting hole, and a protruding post is provided on the side surface of the boss facing away from the base, the protruding post 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.

[0032] According to some embodiments of this application, each of the spring arms is further provided with a protrusion facing away from the moving spring between one end and the substrate;

[0033] The apex of the protrusion is lower than the side surface of the boss facing the movable spring.

[0034] According to some embodiments of this application, a convex ring is provided on the side 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.

[0035] According to some embodiments of this application, the convex ring is formed by folding the edge of the limiting hole of the substrate toward the moving spring.

[0036] According to some embodiments of this application, the convex ring has a top surface facing away from the substrate, and the connection between the top surface and the inner ring surface is chamfered.

[0037] An embodiment of the above application has at least the following advantages or beneficial effects:

[0038] The relay in this embodiment designs a smaller stiffness coefficient for the elastic component from the initial overtravel position to the transition position, and a larger stiffness coefficient from the transition position to the end of the overtravel position. This results in a broken line segment representing the relationship between the reaction force and the magnetic gap from the initial overtravel position to the end of the overtravel position. Consequently, even when reducing the coil power consumption, the attractive force will not be less than the reaction force, ensuring reliable relay closure. Simultaneously, because the stiffness coefficient of the elastic component is larger during the transition from the transition position to the end of the overtravel position, the reaction force is also larger when the push rod assembly moves relative to the moving spring to the end of the overtravel position, thereby increasing the contact pressure.

[0039] Furthermore, while maintaining a constant coil power consumption, the stiffness coefficient of the elastic component can be increased, and the suction force will not be less than the exertion force. Therefore, the relay of this application embodiment can increase the contact pressure while maintaining a constant coil power consumption. Attached Figure Description

[0040] Figure 1 This is an exploded view of a relay according to an exemplary embodiment.

[0041] Figure 2 This is a schematic diagram of a relay according to an exemplary embodiment, wherein the housing and arc extinguishing unit are omitted.

[0042] Figure 3 yes Figure 2 A cross-sectional view along the middle AA.

[0043] Figure 4 yes Figure 2 A sectional view along the middle BB.

[0044] Figure 5 The graph shows the relationship between the attraction and reaction forces and the magnetic gap.

[0045] Figure 6 This is a schematic diagram of a leaf spring according to an exemplary embodiment.

[0046] Figure 7 This is a schematic diagram of a moving assembly with the contact support omitted, according to an exemplary embodiment, wherein the protrusion does not contact the base.

[0047] Figure 8 yes Figure 7 A magnified view of the area at point X1.

[0048] Figure 9 This is a schematic diagram of a moving assembly according to an exemplary embodiment, omitting the contact support, wherein the protrusion contacts the base.

[0049] Figure 10 yes Figure 9 A magnified view of the area at X2 in the middle.

[0050] Figure 11 This is a schematic diagram of a moving component according to an exemplary embodiment.

[0051] Figure 12 yes Figure 11 A sectional view along CC.

[0052] Figure 13 yes Figure 12 A magnified view of the area at X3.

[0053] Figure 14 This is an exploded schematic diagram of the moving component and the second magnetic conductor according to a first exemplary embodiment.

[0054] Figure 15 This is an exploded view of the moving component and the second magnetic conductor according to a second exemplary embodiment.

[0055] Figure 16 This is an exploded schematic diagram of the moving component and the second magnetic conductor according to a third exemplary embodiment.

[0056] Figure 17 This is a schematic diagram of a moving assembly according to a fourth exemplary embodiment, in which the contact support is omitted, and the protrusion does not contact the base.

[0057] Figure 18 This is a schematic diagram of a moving assembly according to a fifth exemplary embodiment, in which the contact support is omitted, and the protrusion does not contact the base.

[0058] Figure 19This is a schematic diagram of a moving assembly according to a sixth exemplary embodiment, in which the contact support is omitted, and the protrusion does not contact the base.

[0059] The reference numerals in the attached figures are explained as follows:

[0060] 1. Relay

[0061] 10. Outer shell

[0062] 11. First shell

[0063] 11a. Exposed hole

[0064] 12. Second shell

[0065] 20. Coil Unit

[0066] 21. Coil Frame

[0067] 22. Coil

[0068] 30. Arc extinguishing unit

[0069] 31. Arc-extinguishing magnet

[0070] 32. Yoke clamp

[0071] 40. Sealing unit

[0072] 1000, Contact Container

[0073] 1001, Contact Chamber

[0074] 1002, First Through Hole

[0075] 1100, Insulating Cover

[0076] 1110. Ceramic cover

[0077] 1111, Third Through Hole

[0078] 1120, frame piece

[0079] 1200, yoke plate

[0080] 1210, Second Through Hole

[0081] 2000, stationary contact lead-out terminal

[0082] 3000, moving components

[0083] 3100, Moving Spring Assembly

[0084] 3110. Moving reed

[0085] 3200, Push Rod Assembly

[0086] 3210. Push rod

[0087] 3211, Base

[0088] 3212, Pole section

[0089] 3213, Card

[0090] 3214. Convex column

[0091] 3215, convex platform

[0092] 3220, Contact Support

[0093] 3221. Top Wall

[0094] 3222, sidewall

[0095] 3223, swivel

[0096] 3300, Flexible Components

[0097] 4000, Magnetic Circuit Section

[0098] 4300, static iron core

[0099] 4310, Through Hole

[0100] 4400, moving iron core

[0101] 4500, Reset component

[0102] 5000, metal cover

[0103] 6100, First Magnet

[0104] 6200, Second Magnet

[0105] 100. Leaf spring

[0106] 110. Substrate

[0107] 111. Limiting hole

[0108] 112.Protruding ring

[0109] 112a, Top surface

[0110] 112b, Inner Torus

[0111] 113. Chamfer

[0112] 120. Spring arm

[0113] 121. Contact part

[0114] 130. Protrusion

[0115] 131. Vertex

[0116] 300. Connectors

[0117] L1, First Spacing

[0118] L2, second spacing Detailed Implementation

[0119] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0120] Furthermore, embodiments of the present invention will be disclosed below with reference to the accompanying drawings. For 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 invention.

[0121] Furthermore, for the sake of neatness in the drawings, some conventionally used structures and components may be shown in a simplified schematic manner in the accompanying drawings. Additionally, some features in the accompanying drawings may be slightly enlarged or their scale or size altered to facilitate understanding and viewing of the technical features of the invention, but this is not intended to limit the invention. The actual dimensions and specifications of products manufactured in accordance with the disclosure of this invention should be adjusted according to production needs, the characteristics of the product itself, and the following disclosure of this invention; this is stated in advance.

[0122] like Figure 1 and Figure 2 As shown, the relay 1 in this embodiment includes a housing 10, a coil unit 20, an arc-extinguishing unit 30, and a sealing unit 40. The sealing unit 40 is disposed inside the housing 10, and the top of the stationary contact lead-out end of the sealing unit 40 is exposed to the outer surface of the housing 10 through the exposure hole 11a. Both the coil unit 20 and the arc-extinguishing unit 30 are disposed inside the housing 10.

[0123] It is understood that the terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0124] As an example, the outer casing 10 includes a first casing 11 and a second casing 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 an embodiment of this application, an exposure hole 11a is provided in the first casing 11.

[0125] The arc extinguishing unit 30 is used to extinguish the electric arc generated between the stationary contact lead-out end of the sealing unit 40 and the moving spring.

[0126] 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 approximately cuboid in shape. The two arc-extinguishing magnets 31 are respectively disposed on both sides of the sealing unit 40 and are arranged opposite each other along the length direction of the moving spring.

[0127] By setting two opposing arc-extinguishing magnets 31, a magnetic field can be formed around the stationary contact lead-out end and the moving spring. Therefore, the electric arc generated between the stationary contact lead-out end and the moving spring is elongated in a direction away from each other by the action of the magnetic field, thus extinguishing the arc.

[0128] The arc-extinguishing unit 30 also includes two yoke clips 32, which are positioned corresponding to the two arc-extinguishing magnets 31. Furthermore, the two yoke clips 32 surround the sealing unit 40 and the two arc-extinguishing magnets 31. This design of the yoke clips 32 surrounding the arc-extinguishing magnets 31 prevents the magnetic field generated by the arc-extinguishing magnets 31 from spreading outwards and affecting the arc-extinguishing effect. The yoke clips 32 are made of soft magnetic material. Soft magnetic materials can include, but are not limited to, iron, cobalt, nickel, and their alloys.

[0129] like Figure 3 and Figure 4 As shown, the sealing unit 40 includes a contact container 1000, a pair of stationary contact leads 2000, a moving component 3000, and a magnetic circuit portion 4000.

[0130] It should be noted that the contact container 1000 is a stationary component, a device used to house the contact assembly, which is mainly a housing and has a chamber. Furthermore, the contact container 1000 can be assembled from multiple components connected in a predetermined assembly manner.

[0131] The contact container 1000 has a contact chamber 1001 inside. The contact container 1000 may include an insulating cover 1100 and a yoke plate 1200. The insulating cover 1100 covers one side surface of the yoke plate 1200, and the insulating cover 1100 and the yoke plate 1200 together form the contact chamber 1001.

[0132] The insulating cover 1100 includes a ceramic cover 1110 and a frame plate 1120. The ceramic cover 1110 is connected to the yoke plate 1200 via the frame plate 1120. The frame plate 1120 can be a ring-shaped metal component, such as an iron-nickel alloy, and one end of the frame plate 1120 is connected to the opening edge of the ceramic cover 1110, for example, by laser welding, brazing, resistance welding, or adhesive bonding. The other end of the frame plate 1120 is connected to the yoke plate 1200, also by laser welding, brazing, resistance welding, or adhesive bonding. The frame plate 1120 positioned between the ceramic cover 1110 and the yoke plate 1200 facilitates their connection.

[0133] The contact container 1000 also has a pair of first through holes 1002, which communicate with the contact chamber 1001. The first through holes 1002 are used for the stationary contact lead-out end 2000 to pass through them. In the embodiments of this application, the first through holes 1002 are formed on the ceramic cover 1110.

[0134] A pair of stationary contact leads 2000 are connected to the ceramic cover 1110 of the contact container 1000, with at least a portion of each stationary contact lead 2000 located within the contact chamber 1001. One of the pair of stationary contact leads 2000 serves as a current inflow terminal, and the other serves as a current outflow terminal.

[0135] A pair of stationary contact leads 2000 are inserted one-to-one into a pair of first through holes 1002 and connected to the ceramic cover 1110, for example by welding.

[0136] The bottom of the stationary contact lead-out terminal 2000 serves as the stationary contact. The stationary contact can be integrally or separately located at the bottom of the stationary contact lead-out terminal 2000.

[0137] Please continue reading. Figure 3 and Figure 4 The moving assembly 3000 includes multiple moving spring assemblies 3100, push rod assemblies 3200, and elastic assemblies 3300 arranged side by side. The moving spring assemblies 3100 are disposed inside the insulating cover 1100 and are mounted on the push rod assemblies 3200 via the elastic assemblies 3300.

[0138] It is understood that the number of moving spring assemblies 3100 can be one or more. When there are multiple moving spring assemblies 3100, the multiple moving spring assemblies 3100 are arranged side by side, and the number of contact points formed by the multiple moving spring assemblies 3100 and each stationary contact lead-out terminal 2000 is multiple, such as two, three, four, etc.

[0139] It should be noted that if a pair of stationary contact leads 2000 and multiple moving spring assemblies 3100 are considered as a set of combinations, then the relays in the embodiments of this application may include multiple sets of combinations.

[0140] Each moving spring assembly 3100 includes a moving spring 3110, and multiple moving springs 3110 are arranged side by side. Each moving spring 3110 has two ends along a first direction D1 for contacting or separating from a pair of stationary contact leads 2000. The first direction D1 is the arrangement direction of the pair of stationary contact leads 2000.

[0141] Each movable spring 3110 may include a movable spring body and movable contacts located at both ends of the movable spring body. The movable contacts may be separate parts connected to the movable spring body. Alternatively, the movable contacts may be integrally formed onto the movable spring body.

[0142] In this embodiment of the application, the moving assembly 3000 includes two moving springs 3110 arranged side by side. One end of each moving spring 3110 is used to contact or separate from the stationary contact of one of the stationary contact leads 2000, and the other end of each moving spring 3110 is used to contact or separate from the stationary contact of the other stationary contact lead 2000. Further, one end of each moving spring 3110 forms two contact points with one of the stationary contact leads 2000, and the other end of each moving spring 3110 forms two contact points with the other stationary contact lead 2000.

[0143] In other embodiments, the number of movable reeds 3110 may be one, three, four, five, etc.

[0144] It is understood that the moving assembly 3000 includes multiple moving springs 3110. The two ends of each moving spring 3110 along the first direction D1 respectively contact or separate from a pair of stationary contact leads. Since the multiple moving springs 3110 do not restrict each other, a reliable parallel circuit is formed after the two ends of each moving spring 3110 along the first direction D1 contact a pair of stationary contact leads 2000. The number of contact points formed by the multiple moving springs 3110 and one stationary contact lead 2000 is greater than or equal to two, achieving a current shunting effect. Furthermore, according to the principle that the magnitude of the electric repulsion force is proportional to the square of the current, the magnitude of the electric repulsion force at each contact is significantly reduced, which is beneficial to improving the short-circuit withstand capability and enhancing the reliability of the relay.

[0145] Each moving spring assembly 3100 also includes a second magnetic conductor 6200, which is fixedly connected to the side of the moving spring 3110 facing away from the stationary contact lead-out end 2000. The function of the second magnetic conductor 6200 will be described in detail below.

[0146] like Figure 3 and Figure 4As shown, 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 support 3220. The contact support 3220 includes a top wall 3221 and two side walls 3222. One end of each side wall 3222 is integrally connected to the two sides of the top wall 3221 along the third direction D3, and the other end of each side wall 3222 is connected to the push rod 3210, thus the contact support 3220 forms an inverted U-shaped structure. Multiple movable springs 3110 are mounted within the space enclosed by the contact support 3220 via an elastic assembly 3300.

[0147] Each sidewall 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. The base 3211 has two clips 3213 on its sides, which respectively engage with the two locking holes 3223 of the contact support 3220 to fix the base 3211 to the contact support 3220. An elastic component 3300 is disposed between the plurality of movable springs 3110 and the base 3211, and is used to apply an elastic force to the plurality of movable springs 3110 toward the top wall 3221 to provide contact pressure.

[0148] In other embodiments, the contact support 3220 may also have other structures, which will not be listed here.

[0149] Understandably, the elastic component 3300 can be used to flexibly support multiple moving springs 3110 and provide contact pressure.

[0150] Of course, in other embodiments, the push rod assembly 3200 may also adopt other structures, which will not be described in detail here.

[0151] Among them, multiple moving reeds 3110 are arranged side by side along the third direction D3.

[0152] Please continue reading. Figure 3 and Figure 4 The yoke plate 1200 has a second through hole 1210, which extends through two opposite sides of the yoke plate 1200 along its thickness direction and communicates with the contact chamber 1001 of the contact container 1000. A rod portion 3212 is axially movably inserted through the second through hole 1210. A base 3211 at one axial end of the rod portion 3212 is located within the contact chamber 1001.

[0153] The sealing unit 40 also includes a metal cover 5000, which is connected to the side of the yoke plate 1200 facing away from the insulating cover 1100, and the metal cover 5000 covers the second through hole 1210 on the yoke plate 1200. The metal cover 5000 and the yoke plate 1200 form a cavity for accommodating the stationary iron core 4300 and the moving iron core 4400 of the magnetic circuit section 4000.

[0154] Return to reference Figure 1 The coil unit 20 includes a coil frame 21 and a coil 22. The coil frame 21 is a hollow cylindrical shape and is made of insulating material. A metal cover 5000 is inserted inside the coil frame 21. The coil 22 surrounds the coil frame 21.

[0155] like Figure 3 and Figure 4 As shown, the magnetic circuit portion 4000 includes a stationary iron core 4300, a moving iron core 4400, and a reset member 4500. The stationary iron core 4300 is fixedly disposed within the metal cover 5000, and a portion of the stationary iron core 4300 extends into the second through hole 1210. The stationary iron core 4300 has a through hole 4310, which is positioned corresponding to the second through hole 1210, for the rod portion 3212 to pass through. The moving iron core 4400 is movably disposed within the metal cover 5000 and is positioned opposite the stationary 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 attracted by the stationary 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.

[0156] The reset element 4500 is located inside the metal cover 5000 and is positioned between the stationary iron core 4300 and the moving iron core 4400. It is used to reset the moving iron core 4400 when the coil 22 is de-energized. The reset element 4500 can be a spring and is sleeved on the outside of the rod portion 3212.

[0157] It should be noted that when coil 22 is energized, the stationary iron core 4300 attracts the moving iron core 4400 to move upward, and the moving iron core 4400 can drive the push rod assembly 3200 to move upward via the rod 3212. When the moving spring 3110 contacts the stationary contact lead-out end 2000, the moving spring 3110 is stopped by the stationary contact lead-out end 2000, while the rod 3212 and the base 3211 will continue to move upward until the overtravel is completed.

[0158] During the overtravel process, the base 3211 will compress the elastic component 3300. After being compressed, the elastic component 3300 can provide elastic force to the moving spring 3110 to provide contact pressure.

[0159] Please continue reading. Figure 3 and Figure 4The relay 1 also includes a first magnetic conductor 610, which is used to form an attractive force on the moving spring 3110 in the direction of contact closure. This attractive force can resist the electric repulsive force generated by the short circuit current between the moving spring 3110 and the stationary contact lead-out terminal 2000, and prevent the moving spring 3110 and the stationary contact lead-out terminal 2000 from springing apart.

[0160] In one embodiment, the first magnetic conductor 6100 is disposed on the side of the movable spring 3110 facing away from the elastic component 3300. In other words, the first magnetic conductor 6100 is disposed on the side of the movable spring 3110 facing the stationary contact lead-out end 2000.

[0161] It is understandable that when the moving reed 3110 is energized, the first magnetic conductor 6100 is magnetized, thereby forming an attractive force on the moving reed 3110 in the direction of contact closure, thus achieving the purpose of short circuit prevention.

[0162] Furthermore, the movable spring assembly 3100 may also include a second magnetic conductor 6200, which is fixedly connected to the side of the movable spring 3110 facing the elastic component 3300. In other words, the second magnetic conductor 6200 is fixedly connected to the side of the movable spring 3110 facing away from the stationary contact lead-out end 2000. The second magnetic conductor 6200 is used to form a magnetic circuit with the first magnetic conductor 6100.

[0163] The number of second magnetic conductors 6200 corresponds to the number of moving springs 3110. In this embodiment, there are two second magnetic conductors 6200, but this is not a limitation. The two second magnetic conductors 6200 are respectively fixedly connected to the side of the two moving springs 3110 facing away from the stationary contact lead-out end 2000.

[0164] When the two ends of the movable reed 3110 are in contact with a pair of stationary contact leads 2000, current flows through the movable reed 3110, thereby forming a magnetic circuit around the movable reed 3110 between the first magnetic conductor 6100 and the second magnetic conductor 6200. When a short-circuit current passes through the movable reed 3110, an attractive force is generated between the first magnetic conductor 6100 and the second magnetic conductor 6200 along the contact pressure direction. This attractive force can resist the electrodynamic repulsive force generated between the movable reed 3110 and the stationary contact leads 2000 due to the short-circuit current, preventing the movable reed 3110 from springing away from the stationary contact leads 2000.

[0165] It is understandable that the first magnetic conductor 6100 and the second magnetic conductor 6200 can be in the shape of a straight line or a U-shape. The first magnetic conductor 6100 and the second magnetic conductor 6200 can be made of soft magnetic materials such as iron, cobalt, nickel, and their alloys.

[0166] like Figure 3 and Figure 4As shown, the first magnetic conductor 6100 is disposed inside the contact container 1000 and is fixedly disposed relative to the contact container 1000. In this way, the short-circuit protection force is transferred to the contact container 1000. Since the contact container 1000 is a stationary component, there is no need for excessive coil holding force, thereby reducing the power consumption of the relay 1 coil and the size of the relay 1, and improving the short-circuit protection capability.

[0167] Furthermore, the first magnetic conductor 6100 is connected to the ceramic cover 1110 of the insulating cover 1100 via the connector 300. The ceramic cover 1110 of the insulating cover 1100 is provided with a third through hole 1111; the connector 300 is rod-shaped and passes 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.

[0168] 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, or bonding. 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, or snap-fitting.

[0169] It is understandable that when the connection between one end of the connector 300 and the ceramic cover 1110 is made by welding, by welding the connector 300 to the top wall of the ceramic cover 1110, the metallization layer can be processed only around 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 is convenient for processing and simplifies the processing steps.

[0170] It is understandable that one end of the connector 300 can be connected to the outer wall surface of the ceramic cover 1110, or to the inner wall surface of the ceramic cover 1110, or to both the outer and inner wall surfaces of the ceramic cover 1110 at the same time.

[0171] It can be seen that the first magnetic conductor 6100 is connected to the ceramic cover 1110 through the connector 300. On the one hand, the short-circuit resistance force is transferred to the ceramic cover 1110, so there is no need for excessive coil holding force, thereby reducing the power consumption of the relay 1 coil and the size of the relay 1, and improving the short-circuit resistance capability. On the other hand, since the connector 300 is connected to the ceramic cover 1110, it will not occupy too much space in the contact chamber, ensuring the arc extinguishing space of the arc extinguishing component and the movement space of the push rod.

[0172] In addition, the first magnetic conductor 6100 is connected to the rod-shaped connector 300, so that the first magnetic conductor 6100 and the connector 300 can be connected in a variety of ways, such as riveting, laser welding, snap-fitting, adhesive bonding, etc., which enriches the connection methods.

[0173] As an example, connector 300 is a solid rod. This allows connector 300 to be riveted to the first magnetic conductor 6100, making the connection more reliable. Furthermore, the solid rod provides higher support strength and is less prone to deformation.

[0174] Of course, the first magnetic conductor 6100 can also be fixed inside the contact container 1000 by means of a fixed bracket (not shown in the figure). Specifically, the fixed bracket is located inside the contact container 1000 and is fixedly connected to the yoke plate 1200, and the first magnetic conductor 6100 is fixedly connected to the fixed bracket.

[0175] In addition, the first magnetic conductor 6100 can also be fixedly connected to the inner side of the top wall 3221 of the contact support 3220 to form a follow-up anti-short circuit structure.

[0176] In another embodiment, the distance between the first magnetic conductor 6100 and the second magnetic conductor 6200 can be designed to be variable. Specifically, the distance between the first magnetic conductor 6100 and the second magnetic conductor 6200 can be adjusted according to the magnitude of the current value, thereby changing the magnitude of the magnetic attraction force generated between the first magnetic conductor 6100 and the second magnetic conductor 6200, which can meet the requirements of short circuit resistance and overload interruption.

[0177] Optionally, the first magnetic conductor 6100 may include multiple stacked magnetic sheets. It is understood that by increasing the number of thinner magnetic sheets, the overall thickness of the first magnetic conductor 6100 can be increased. On the one hand, the thinner magnetic sheets can be manufactured using thin strips, resulting in lower material costs and ease of handling. On the other hand, the number of magnetic sheets can be flexibly adjusted according to the magnitude of the short-circuit current.

[0178] Understandably, the process of relay 1 switching from fully open to fully closed can be divided into two stages: In the first stage, the moving iron core 4400 drives the moving spring 3110 upwards via the push rod assembly 3200 until the moving spring 3110 just contacts the stationary contact lead-out end 2000. In this first stage, the suction force provided by the stationary iron core 4300 to the moving iron core 4400 increases slowly 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 moving iron core 4400 itself. In the second stage, after the moving spring 3110 contacts the stationary contact lead-out end 2000, the moving iron core 4400 does not stop moving; instead, it continues to drive the push rod assembly 3200 upwards until the moving iron core 4400 contacts the stationary iron core 4300 (this second stage is the overtravel process). In this second stage, the elastic component 3300 is compressed by the push rod assembly 3200 and provides elastic force. Therefore, the suction force provided by the stationary iron core 4300 to the moving iron core 4400 needs to be greater than the sum of the elastic force provided by the reset component 4500, the push rod assembly 3200, the weight of the moving iron core 4400 itself, and the elastic force provided by the elastic component 3300.

[0179] For easier understanding, please refer to... Figure 5 To elaborate further. It should be noted that... Figure 5 The graphs shown depict the relationship between the attraction and reaction forces and the magnetic gap. Curve 1 represents the relationship between the attraction force and the magnetic gap, while curve 2 represents the relationship between the reaction force and the magnetic gap in the prior art relay 1.

[0180] according to Figure 5 It can be seen that during the entire process of relay 1 switching from fully open to fully closed, the attraction force increases exponentially as the magnetic gap between the stationary iron core 4300 and the moving iron core 4400 gradually decreases. The change in reaction force can be divided into two stages. Before the moving spring 3110 contacts the stationary contact lead-out end 2000, the reaction force only includes the elastic force provided by the reset component 4500 and the weight of the push rod assembly 3200 and the moving iron core 4400 itself. As the magnetic gap gradually decreases, after the moving spring 3110 contacts the stationary contact lead-out end 2000, the elastic force provided by the elastic component 3300 also joins the reaction force. Therefore, curve 2, representing the reaction force, has a turning point where the reaction force increases sharply.

[0181] Further based on Figure 5 It can be seen that, regardless of the size of the magnetic gap, the attractive force must always be greater than the reaction force.

[0182] As described in the background section, increasing contact pressure requires increasing the power consumption and size of the coil, which contradicts the current trend of low power consumption and small size in coil development.

[0183] In addition, such as Figure 5As shown, where Figure 5 Curve 3 in the figure represents the relationship between the attraction force and the magnetic gap after the coil power consumption is reduced. If the contact pressure is kept constant and the power consumption of the coil is directly reduced (the power consumption of the coil decreases and the attraction force decreases), then at a certain moment during the entire process of contact closure, there will be a moment when the attraction force is less than the reaction force (i.e. the attraction force and the reaction force are mismatched), which will cause relay 1 to fail to close.

[0184] It is evident that in the existing technology, contact pressure and coil power consumption cannot be balanced, which obviously affects the development of relay 1.

[0185] Based on this, this application provides a relay 1 in which the stiffness coefficient of the elastic component 3300 is designed to be variable, which reduces the coil power consumption without affecting the matching of the pull-back force, and can also ensure a sufficiently large contact pressure.

[0186] During the overtravel process, the push rod assembly 3200 compresses 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 moving spring 3110.

[0187] During the movement of the push rod assembly 3200 from the initial overtravel position to the transition position, the elastic component 3300 has a first stiffness coefficient; during the movement of the push rod assembly 3200 from the transition position to the end of the overtravel position, the elastic component 3300 has a second stiffness coefficient, and the first stiffness coefficient is smaller than the second stiffness coefficient.

[0188] It should be noted that the initial overtravel position refers to the position of the push rod assembly 3200 relative to the moving spring 3110 when the push rod assembly 3200 drives the moving spring 3110 to just make contact with the stationary contact lead-out end 2000; the end overtravel position refers to the position of the push rod assembly 3200 relative to the moving spring 3110 after the moving iron core 4400 makes contact with the stationary iron core 4300 (i.e., the magnetic gap is equal to zero).

[0189] In this embodiment, before the push rod assembly 3200 moves relative to the movable spring 3110 from the overtravel initial position to the transition position, the elastic component 3300 has a first stiffness coefficient. During the process of the push rod assembly 3200 moving relative to the movable spring 3110 from the transition position to the overtravel end position, the elastic component 3300 has a second stiffness coefficient. Since the first stiffness coefficient is smaller than the second stiffness coefficient, the relationship curve between the reaction force and the magnetic gap during the overtravel process of the push rod assembly 3200 compressing the elastic component 3300 is a broken line (e.g., ...). Figure 5 Curve 4 in the middle.

[0190] 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 comes into contact with the stationary contact lead-out 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 will be introduced, and the part that coincides with curve 2 will not be described again.

[0191] like Figure 5 As shown, in the prior art, when the push rod assembly 3200 is in the initial position of overtravel, it corresponds to point A of curve 2; when the push rod assembly 3200 is in the end position of overtravel, it corresponds to point B of curve 2.

[0192] In this embodiment, when the push rod assembly 3200 is in the initial overtravel position, it corresponds to point A' of curve 4 (A' coincides with A); when the push rod assembly 3200 is in the end overtravel position, 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 in the transition position, it corresponds to point C of curve 4.

[0193] Therefore, it can be seen that the relationship curve between reaction force and magnetic gap in the prior art is a straight line segment AB, while the relationship curve between reaction force and magnetic gap in the embodiment of this application is a broken line segment A'CB'. The slope of the A'C line segment is less than the slope of the AB line segment, and the slope of the AB line segment is less than the slope of the CB' line segment.

[0194] In this embodiment, since the slope of line segment A'C is less than the slope of line segment AB, and the slope of line segment CB' is greater than the slope of line segment AB, curve 3 will not intersect with A'CB'. Instead, curve 3 will always be above curve 4. Therefore, during the entire process of contact closure, there will be no situation where the suction force is less than the reaction force (i.e., the suction force and reaction force are mismatched).

[0195] Therefore, the relay 1 in this embodiment of the application, by designing the stiffness coefficient of the elastic component 3300 to be relatively small from the initial position to the transition position of the overtravel, and relatively large from the transition position to the end position of the overtravel, makes the relationship curve between the reaction force and the magnetic gap a broken line segment from the initial position to the end position of the overtravel. This ensures that even when the power consumption of the coil is reduced, the attraction force will not be less than the reaction force, thus ensuring that the relay 1 closes reliably. At the same time, because the stiffness coefficient of the elastic component 3300 is relatively large during the transition position to the end position of the overtravel, the reaction force is also relatively large when the push rod assembly 3200 moves relative to the moving spring 3110 to the end position of the overtravel, thereby increasing the contact pressure.

[0196] In addition, please continue to refer to Figure 5If the power consumption of the coil remains constant, meaning the relationship curve between the attraction force and the magnetic gap is still curve 1, then curve 4 can shift upwards, i.e., increase the value of the reaction force, provided that the attraction force is greater than the reaction force. Therefore, the relay 1 in this embodiment of the application can increase the reaction force while maintaining a constant coil power consumption, thereby increasing the contact pressure.

[0197] like Figures 6 to 10 As shown, the elastic component 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 spring arms 120. The base 110 is connected to the base 3211 of the push rod assembly 3200, and 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; 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 against the push rod assembly 3200.

[0198] Understandably, when the spring arm 120 is not in contact with the push rod assembly 3200, the lever arm of the spring arm 120 is relatively long, and the spring coefficient is relatively small; when the spring arm 120 abuts against the push rod assembly 3200, the lever arm of the spring arm 120 becomes smaller, and the spring coefficient becomes larger.

[0199] like Figures 6 to 10 As shown, in one embodiment, each spring arm 120 is provided with a protrusion 130 protruding in the opposite direction to the moving spring 3110 between one end of the spring arm 120 and the substrate 110, and the other end of each spring arm 120 abuts against the moving spring 3110.

[0200] 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.

[0201] Understandably, when the protrusion 130 does not contact the push rod assembly 3200, the lever arm of the spring arm 120 is relatively long, and the spring coefficient is relatively small; when the protrusion 130 abuts against the push rod assembly 3200, the lever arm of the spring arm 120 becomes smaller, and the spring coefficient becomes larger.

[0202] The spring arm 120 bends from the protrusion 130 toward the moving spring 3110, and the spring arms 120 on both sides of the base plate 110 along the first direction D1 extend in a direction away from each other. The other end of the spring arm 120 is provided with an abutment portion 121, which abuts against the moving spring 3110; a first distance L1 is provided between the abutment portions 121 on both sides of the base plate 110 along the first direction D1; a second distance L2 is provided between the protrusions 130 on both sides of the base plate 110 along the first direction D1, and the first distance L1 is greater than the second distance L2. The spring arms 120 on both sides of the base plate 110 are symmetrically arranged along the first direction D1, and the protrusions 130 on both sides of the base plate 110 are symmetrically arranged along the first direction D1.

[0203] Of course, in another embodiment, the stiffness coefficient of the spring arm 120 can also be changed by not providing a protrusion 130 between one end of each spring arm 120 and the base plate 110, but providing a protrusion on the side surface of the base 3211 facing the leaf spring 100. Before the push rod assembly 3200 moves to the transition position, the protrusion does not contact the leaf spring 100, at which point the lever arm of the leaf spring 100 is longer and the stiffness coefficient is smaller; 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 abuts against the leaf spring 100, at which point the lever arm of the leaf spring 100 becomes smaller and the stiffness coefficient becomes larger.

[0204] like Figure 11 and Figure 12 As shown, the base 3211 has a boss 3215 facing the movable spring 3110; the base plate 110 of the elastic component 3300 is connected to the side surface of the boss 3215 facing away from the base 3211. The base plate 110 has a limiting hole 111, and a protruding post 3214 protrudes from the side surface of the boss 3215 facing away from the base 3211. The protruding post 3214 is inserted into the limiting hole 111, and the side surface of the base plate 110 facing away from the movable spring 3110 abuts against the side surface of the boss 3215 facing the movable spring 3110.

[0205] The shape of the limiting hole 111 can have various embodiments. When the substrate 110 has one limiting hole 111, the shape of the limiting hole 111 can be a non-circular shape such as a rectangle, ellipse, or triangle, which can prevent the base 3211 from rotating relative to the substrate 110, thus achieving an anti-rotation effect. When the substrate 110 has two or more (including two) limiting holes 111, the shape of the limiting hole 111 can be circular or non-circular.

[0206] like Figure 6 and Figure 13As shown, a raised ring 112 is provided on the side surface of the substrate 110 facing the movable spring 3110. The raised ring 112 surrounds the limiting hole 111, and the inner ring surface 112b of the raised ring 112 is flush with the hole wall of the limiting hole 111. Further, the raised ring 112 is formed by folding the edge of the limiting hole 111 of the substrate 110 toward the movable spring 3110.

[0207] By providing a protruding ring 112 at the edge of the limiting hole 111, the friction between the protruding post 3214 and the substrate 110 can be reduced and the generation of chips can be prevented when the substrate 110 and the base 3211 are assembled.

[0208] The protruding ring 112 has a top surface 112a facing away from the substrate 110, and a chamfer 113 is provided at the connection between the top surface 112a and the inner ring surface 112b. By providing a chamfer 113 at the connection between the top surface 112a and the inner ring surface 112b, burrs generated during the forming process of the protruding ring 112 can be eliminated, and scraping is further prevented between the protruding post 3214 and the inner ring surface 112b of the protruding ring 112.

[0209] like Figure 7 and Figure 9 As shown, 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 surfaces of the boss 3215 and the movable spring 3110 that face each other.

[0210] In the embodiments of this application, such as Figure 7 As shown, before the push rod assembly 3200 moves from the overtravel initial position to the transition position relative to the movable spring 3110, the protrusion 130 does not contact 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 plate 110 and the boss 3215 is L3. Therefore, before the push rod assembly 3200 moves from the overtravel initial position to the transition position, the lever arm of the movable spring 3110 on the leaf spring 100 is L3.

[0211] like Figure 9 As shown, during the process of the push rod assembly 3200 moving from the transition position to the overtravel end position relative to the movable spring 3110, the protrusion 130 abuts against the base 3211. 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 position where the protrusion 130 abuts against the base 3211 is L4. Therefore, during the process of the push rod assembly 3200 moving from the transition position to the overtravel end position, the lever arm of the movable spring 3110 acting on the leaf spring 100 is L4. Wherein, L4 is less than L3.

[0212] As described above, there is a first spacing L1 between the abutting portions 121 on both sides of the substrate 110 along the first direction D1, and a second spacing L2 between the protrusions 130 on both sides of the substrate 110 along the first direction D1. Therefore, L3 equals L1 / 2, and L4 equals (L1-L2) / 2.

[0213] In one embodiment, the protrusion 130 is formed by bending the leaf spring 100, but this is not a limitation.

[0214] like Figure 14 As shown, the substrate 110 has multiple spring arms 120 on both sides along the first direction D1. The number of multiple spring arms 120 on one side of the substrate 110 corresponds to the number of multiple movable springs 3110, and the other end of the multiple spring arms 120 abuts against one end of the multiple movable springs 3110 respectively.

[0215] In one specific embodiment, there are two moving springs 3110 and two second magnetic conductors 6200. The substrate 110 is provided with two spring arms 120 on both sides 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.

[0216] Of course, in another embodiment, there are multiple leaf springs 100, and the number of leaf springs 100 corresponds to the number of movable leaf springs 3110. Each leaf spring 100 has a spring arm 120 on both sides of its base plate 110 along the first direction D1, and one leaf spring 100 corresponds to one movable leaf spring 3110.

[0217] like Figure 15 As shown, the similarities between the second embodiment and the first embodiment will not be repeated here, but the differences are as follows:

[0218] The number of movable reed 3110 and second magnetic conductor 6200 is one, and the substrate 110 is provided with a spring arm 120 on each side along the first direction D1.

[0219] like Figure 16 As shown, the similarities between the third embodiment and the first embodiment will not be repeated here, but the differences are as follows:

[0220] The number of movable reed 3110 and second magnetic conductor 6200 are both three, and the substrate 110 is provided with three spring arms 120 on both sides along the first direction D1.

[0221] like Figure 17 As shown, the similarities between the fourth embodiment and the first embodiment will not be repeated here, but the differences are as follows:

[0222] The end of the leaf spring 100 arm 120 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 relative rotation between the leaf spring 100 and the movable spring 3110 about the axis of the push rod assembly 3200.

[0223] In one embodiment, the anti-rotation structure can be a combination of a limiting hole and a limiting protrusion; in another embodiment, the anti-rotation structure can also be a riveting structure, with the end of the spring arm 120 away from the base plate 110 riveted to the movable spring 3110; in yet another embodiment, the anti-rotation structure can also be a welding structure, with the end of the spring arm 120 away from the base plate 110 welded to the movable spring 3110.

[0224] Furthermore, the leaf spring 100 of the fourth embodiment has a different shape than the leaf spring 100 of the first embodiment. In this embodiment, the ends of the spring arms 120 on both sides of the substrate 110 along the first direction D1 converge towards the middle.

[0225] like Figure 18 As shown, the similarities between the fifth embodiment and the fourth embodiment will not be repeated here, but the differences are as follows:

[0226] The leaf spring 100 of the fifth embodiment has a different shape than 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.

[0227] Among them, the first spacing L1 is not greater than the second spacing L2.

[0228] like Figure 19 As shown, the similarities between the sixth embodiment and the fourth embodiment will not be repeated here, but the differences are as follows:

[0229] The leaf spring 100 is mounted on the movable spring 3110, and the base plate 110 of the leaf spring 100 abuts against the side surface of the boss 3215 facing the movable spring 3110.

[0230] It is understood that the various embodiments / implementations provided in this application can be combined with each other without creating contradictions, and will not be described one by one here.

[0231] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0232] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the application.

[0233] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the claims. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0234] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application examples.

Claims

1. A relay, characterized in that, include: A pair of stationary contact leads; Push rod assembly; A movable spring assembly includes a movable spring sheet, the two ends of which are used to contact or separate from a pair of stationary contact leads along a first direction; the first direction is the arrangement direction of the pair of stationary contact leads. A leaf spring is connected to the movable spring assembly and the push rod assembly. The leaf spring is used to provide contact pressure to the movable spring sheet. The leaf spring includes a base plate and spring arms. The base plate is connected to the push rod assembly. 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 sheet. During the overtravel process, the push rod assembly compresses the leaf spring 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 position of the moving leaf spring. During the movement of the push rod assembly from the initial overtravel position to the transition position, the spring arm does not contact the push rod assembly, so that the leaf spring has a first stiffness coefficient; when the push rod assembly moves to the transition position and during the movement from the transition position to the end of the overtravel position, the spring arm abuts against the push rod assembly, so that the leaf spring has a second stiffness coefficient, wherein the first stiffness coefficient is less than the second stiffness coefficient.

2. The relay according to claim 1, characterized in that, Each of the spring arms also has a protrusion at one end between itself and the substrate, with the protrusion facing away from the moving spring. 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.

3. The relay according to claim 2, characterized in that, The spring arm bends from the protrusion toward the moving spring, and the spring arms located on both sides of the substrate along the first direction extend in directions away from each other.

4. The relay according to claim 2, characterized in that, The other end of the spring arm is provided with an abutment portion, which abuts against the movable spring sheet; A first spacing is provided between the abutting portions located on both sides of the substrate along the first direction; The protrusions located on both sides of the substrate along the first direction have a second spacing, and the first spacing is greater than the second spacing.

5. The relay according to claim 2, characterized in that, The protrusion is formed by bending the leaf spring.

6. The relay according to claim 1, characterized in that, The relay includes a plurality of said moving spring assemblies, each of said moving spring assemblies including a moving spring plate, and the plurality of moving spring plates are arranged side by side along a third direction; wherein, the movement direction of the moving spring plate 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 corresponds to the number of the plurality of movable springs.

7. The relay according to claim 1, characterized in that, The relay also includes: The first magnetic conductor is disposed on the side of the movable reed facing away from the leaf spring.

8. The relay according to claim 7, characterized in that, The moving spring assembly further includes a second magnetic conductor, which is fixedly connected to the side of the moving spring facing the leaf spring. The second magnetic conductor is used to form a magnetic circuit with the first magnetic conductor.

9. The relay according to claim 1, characterized in that, The push rod assembly includes: rod section; A base is connected to one axial end of the rod; the base has a boss facing the movable spring; the leaf spring is connected to the side surface of the boss facing away from the base.

10. The relay according to claim 9, characterized in that, The substrate is provided with a limiting hole, and a protruding post is provided on the side surface of the boss facing away from the base. The protruding post is inserted into the limiting hole, and the side surface of the substrate facing away from the moving spring abuts against the side surface of the boss facing the moving spring.

11. The relay according to claim 10, characterized in that, Each of the spring arms also has a protrusion at one end between itself and the substrate, with the protrusion facing away from the moving spring. The apex of the protrusion is lower than the side surface of the boss facing the movable spring.

12. The relay according to claim 10, characterized in that, The substrate has a raised ring on the side surface facing the movable spring, the raised ring surrounds the limiting hole, and the inner ring surface of the raised ring is flush with the hole wall of the limiting hole.

13. The relay according to claim 12, characterized in that, The convex ring is formed by folding the edge of the limiting hole in the substrate toward the moving spring.

14. The relay according to claim 12, characterized in that, The convex ring has a top surface facing away from the substrate, and the connection between the top surface and the inner ring surface is chamfered.

15. A relay, characterized in that, include: Push rod assembly; The moving spring assembly includes the moving spring leaf; A leaf spring, connected to the movable spring assembly and the push rod assembly, is used to provide contact pressure to the movable spring leaf; During the overtravel process, the push rod assembly compresses the leaf spring 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 position of the moving leaf spring. The push rod assembly includes a base, and the base has a protrusion on one side surface facing the leaf spring; wherein, before the push rod assembly moves to the transition position, the protrusion does not contact the leaf spring, so that the leaf spring has a first stiffness coefficient; 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 leaf spring, so that the leaf spring has a second stiffness coefficient, the first stiffness coefficient being less than the second stiffness coefficient.

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