Relay

Abstract

A relay, comprising a push rod assembly, a movable contact assembly, and an elastic assembly. The movable contact assembly comprises a movable contact piece. The elastic assembly comprises a first leaf spring, the first leaf spring has a connecting portion and an abutting portion, the connecting portion is mounted on one of the push rod assembly and the movable contact assembly, and the abutting portion slidably abuts against the other one of the push rod assembly and the movable contact assembly. The other one of the push rod assembly and the movable contact assembly is provided with an abutting surface which is configured to abut against the abutting portion so as to increase the amount of compression of the first leaf spring.

Description

relay

[0001] Cross-references

[0002] This disclosure claims priority to Chinese patent application No. 202510358751.9, entitled “Relay,” filed on March 25, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of electrical control device technology, and more specifically, to a relay. Background Technology

[0004] 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.

[0005] A high-voltage DC relay is a type of relay. The core component of a relay is its contact assembly, and the switching state of the contacts determines the relay's performance. Contact pressure is the pressure generated on the contact surface between the moving and stationary contacts under external force, which directly affects the relay's reliability, service life, and electrical performance.

[0006] However, relays in the existing technology generally suffer from insufficient contact pressure, which not only affects the electrical performance of the relay, but also shortens the service life of the relay, increases the failure rate, and thus affects the reliability and stability of the entire system. Summary of the Invention

[0007] This application provides a relay to improve the problem of insufficient contact pressure in relays in the related art.

[0008] The relay of this disclosure includes a push rod assembly, a movable contact assembly, and an elastic assembly. The movable contact assembly includes a movable contact piece; the elastic assembly includes a first leaf spring having a connecting portion and an abutting portion. The connecting portion is mounted on one of the push rod assembly and the movable contact assembly, and the abutting portion slidably abuts against the other of the push rod assembly and the movable contact assembly. The other of the push rod assembly and the movable contact assembly has an abutting surface configured to abut against the abutting portion to increase the compression of the first leaf spring.

[0009] According to some embodiments of this disclosure, another of the push rod assembly and the movable contact assembly is provided with a groove, the opening of the groove facing one of the push rod assembly and the movable contact assembly; at least a portion of the abutment portion is located within the groove, and the groove sidewall has the abutment surface.

[0010] According to some embodiments of this disclosure, during the overtravel process, the push rod assembly compresses the first leaf spring, and the position of the push rod assembly relative to the moving contact piece sequentially includes an overtravel initial position, a second transition position, and an overtravel end position;

[0011] Before the push rod assembly moves from the overtravel initial position to the second transition position, the bottom wall of the groove abuts against the abutting part; during the process of the push rod assembly moving from the second transition position to the overtravel end position, the abutting surface abuts against the abutting part.

[0012] According to some embodiments of this disclosure, the groove has a bottom surface, the abutting surface is connected to the bottom surface and extends from the bottom surface in a direction away from the push rod assembly.

[0013] According to some embodiments of this disclosure, the abutting portion has two sub-parts, which are respectively disposed at both ends of the first leaf spring along the length direction of the movable contact piece, for abutting against the push rod assembly and the other of the movable contact assembly;

[0014] The contact surface has two inclined surfaces, which are arranged opposite each other along the length of the movable contact piece. The two inclined surfaces are configured to abut against the two sub-parts respectively during overtravel.

[0015] According to some embodiments of this disclosure, the connecting portion is mounted on the push rod assembly, the abutting portion abuts against the movable contact piece, and the movable contact piece has the abutting surface.

[0016] According to some embodiments of this disclosure, the relay further includes a pair of stationary contacts, and the moving contact is used to make or break contact with the pair of stationary contacts;

[0017] The relay also includes a first magnetic conductor, which is located on the side of the moving contact facing the stationary contact.

[0018] According to some embodiments of this disclosure, the movable contact assembly further includes a second magnetic conductor, which is connected to the side of the movable contact piece facing away from the stationary contact, and the first magnetic conductor and the second magnetic conductor are used to form a magnetic circuit.

[0019] The connecting part is mounted on the push rod assembly, and the abutting part abuts against the second magnetic conductor, the second magnetic conductor having the abutting surface.

[0020] According to some embodiments of this disclosure, the elastic component further includes a second leaf spring stacked with the first leaf spring, the first leaf spring and the second leaf spring being mounted on one of the push rod assembly and the movable contact assembly, and the connection position forming a first fulcrum.

[0021] During the overtravel process, the push rod assembly squeezes the elastic component, and has an overtravel initial position and a first transition position relative to the position of the moving contact piece;

[0022] Before the push rod assembly moves from the overtravel initial position to the first transition position, the first leaf spring deforms around the first fulcrum and has a first lever arm, during which the abutting part does not abut against the abutting surface; at the first transition position, the first leaf spring and the second leaf spring are in contact.

[0023] According to some embodiments of this disclosure, the contact position of the first leaf spring and the second leaf spring forms a second fulcrum; during the overtravel process, the position of the push rod assembly relative to the moving contact piece also has a second transition position; during the movement of the push rod assembly from the first transition position to the second transition position, part of the first leaf spring deforms with the second fulcrum as the rotation point and has a second lever arm, and the abutting part does not abut against the abutting surface;

[0024] The length of the first lever arm is not equal to the length of the second lever arm.

[0025] According to some embodiments of this disclosure, during the overtravel process, the push rod assembly relative to the moving contact piece also has an overtravel end position;

[0026] During the movement of the push rod assembly from the second transition position to the overtravel end position, both the first leaf spring and the second leaf spring deform around the first fulcrum as the rotation point, and the abutting part abuts against the abutting surface.

[0027] According to some embodiments of this disclosure, the second leaf spring includes a second base plate and a second extension arm;

[0028] The second substrate and the connecting part are mounted on one of the push rod assembly and the movable contact assembly. The second substrate is provided with the second extension arm at both ends along the length direction of the movable contact piece. The second extension arm is bent and connected to the second substrate. The end of the second extension arm away from the second substrate contacts the first leaf spring, and the contact position forms a second fulcrum.

[0029] Before the push rod assembly moves from the overtravel initial position to the first transition position, the second leaf spring is not compressed by the push rod assembly and does not deform; during the process of the push rod assembly moving from the first transition position to the second transition position, the second extension arm contacts the first leaf spring, and the portion of the first leaf spring extending beyond the second fulcrum along the length direction of the movable contact plate deforms with the second fulcrum as the rotation point, and the portion of the first leaf spring extending beyond the second fulcrum has the abutment portion.

[0030] According to some embodiments of the present disclosure, the first leaf spring includes a first base plate and a first extension arm, wherein the first base plate has the connecting portion;

[0031] The first substrate and the second substrate are stacked, and the connecting portion of the first substrate and the second substrate are mounted on one of the push rod assembly and the movable contact assembly, and the connecting position forms the first fulcrum; the first substrate is provided with the first extension arm at both ends along the length direction of the movable contact piece, and the first extension arm is bent and connected to the first substrate;

[0032] The positions of the first extension arms at both ends of the first substrate correspond to the positions of the second extension arms at both ends of the second substrate, and the positions where the corresponding first extension arms and second extension arms contact each other form the second fulcrum.

[0033] According to some embodiments of this disclosure, the first extension arm bends from the first substrate toward another point near the movable contact assembly and the push rod assembly.

[0034] According to some embodiments of this disclosure, the stiffness coefficient of the first leaf spring is less than or equal to the stiffness coefficient of the second leaf spring.

[0035] According to some embodiments of this disclosure, the thickness of the first leaf spring is less than or equal to the thickness of the second leaf spring.

[0036] According to some embodiments of this disclosure, during the overtravel process, the push rod assembly relative to the moving contact piece also has an overtravel end position;

[0037] During the movement of the push rod assembly from the first transition position to the overtravel end position, both the first leaf spring and the second leaf spring deform around the first fulcrum.

[0038] According to some embodiments of this disclosure, the length of the first leaf spring and the length of the second leaf spring are equal.

[0039] According to some embodiments of this disclosure, the contact surface is a plane or a curved surface.

[0040] According to some embodiments of this disclosure, the abutting surface is configured to abut the abutting portion during overtravel.

[0041] An embodiment of the above application has at least the following advantages or beneficial effects:

[0042] In the relay of this embodiment, another of the push rod assembly and the movable contact assembly is provided with an abutment surface. The abutment surface can abut against the abutment portion, thereby squeezing the abutment portion and further compressing the first leaf spring. This increases the compression of the first leaf spring, thereby increasing the contact pressure and avoiding poor contact due to insufficient contact pressure. This reduces the failure rate of the relay, improves the reliability and stability of the system, and extends the service life of the relay.

[0043] Furthermore, another of the push rod assembly and the movable contact assembly is provided with a groove, at least a portion of the abutment portion is inside the groove, and the groove sidewall has an abutment surface. When the abutment portion does not abut against the abutment surface, at least a portion of the abutment portion is located inside the groove, and the groove plays a limiting role for the abutment portion, preventing the first leaf spring from deflecting relative to the movable contact assembly.

[0044] Furthermore, the elastic component also has a second fulcrum. Before moving from the initial overtravel position to the first transition position, the first leaf spring deforms. During the movement from the first transition position to the second transition position, a portion of the first leaf spring deforms. During the movement from the second transition position to the end of the overtravel position, both the first and second leaf springs deform simultaneously. Therefore, the stiffness coefficient of the elastic component is variable, making the relationship curve between the reaction force and the magnetic gap a broken line throughout the entire overtravel process, thus balancing contact pressure and coil power consumption. In addition, the two leaf springs improve the overall mechanical fatigue resistance of the elastic component. Furthermore, during the movement from the second transition position to the end of the overtravel position, the simultaneous deformation of the two leaf springs enhances the overall mechanical fatigue resistance of the elastic component.

[0045] Furthermore, the second leaf spring contacts the first leaf spring to form a second fulcrum. The position of the second fulcrum can be adjusted by adjusting the position of the contact, thereby adjusting the size of the lever arm. This allows for greater design freedom and wider applicability.

[0046] Furthermore, the elastic component includes a first leaf spring and a second leaf spring. During the movement from the initial overtravel position to the first transition position, the first leaf spring deforms. During the movement from the first transition position to the end of the overtravel position, both the first and second leaf springs deform simultaneously. Therefore, the stiffness coefficient of the elastic component is variable. Designing the first and second leaf springs to be of equal length can improve the versatility of the parts and increase assembly efficiency. Attached Figure Description

[0047] Figure 1 is an exploded view of a relay according to an exemplary embodiment.

[0048] Figure 2 is a schematic diagram of a relay according to an exemplary embodiment, wherein the housing and arc extinguishing unit are omitted.

[0049] Figure 3 is a cross-sectional view along Figure 2A-A.

[0050] Figure 4 is a cross-sectional view along B-B in Figure 2.

[0051] Figure 5 shows the relationship curves between attraction and reaction force and magnetic gap.

[0052] Figure 6 is an exploded schematic diagram of a resilient component according to an exemplary embodiment.

[0053] Figure 7 shows a schematic diagram of the push rod assembly in the overtravel initial position relative to the moving contact.

[0054] Figure 8 shows a schematic diagram of the push rod assembly in the first transition position relative to the moving contact piece.

[0055] Figure 9 shows a schematic diagram of the push rod assembly in the second transition position relative to the moving contact piece.

[0056] Figure 10 shows a schematic diagram of the push rod assembly in the overtravel contact position relative to the moving contact piece.

[0057] Figure 11 shows an exploded view of the moving component and the second magnetic conductor according to the first embodiment of this disclosure.

[0058] Figure 12 shows an exploded view of the moving component and the second magnetic conductor according to the second embodiment of the present disclosure.

[0059] Figure 13 shows an exploded view of the moving component and the second magnetic conductor according to the third embodiment of this disclosure.

[0060] Figure 14 shows a schematic diagram of the moving component and the second magnetic conductor according to the fourth embodiment of the present disclosure, wherein the contact support is omitted.

[0061] Figure 15 shows a three-dimensional schematic diagram of the moving contact. Detailed Implementation

[0062] 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 disclosure 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.

[0063] It is understood that the terms "comprising" and "having," and any variations thereof, used in the embodiments of this disclosure, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus 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 such processes, methods, products, or apparatus.

[0064] 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.

[0065] 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.

[0066] As shown in Figures 1 and 2, the relay 1 of 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 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.

[0067] As an example, the housing 10 includes a first housing 11 and a second housing 12 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 disclosure, an exposure hole 11a is provided in the first housing 11.

[0068] The arc extinguishing unit 30 is used to extinguish the electric arc generated between the stationary contact and the moving contact of the sealing unit 40.

[0069] As an example, the arc-extinguishing unit 30 includes two permanent magnets 31. In one embodiment, each permanent magnet 31 may be generally cuboid in shape. The two permanent magnets 31 are respectively disposed on both sides of the sealing unit 40 and are arranged opposite to each other along the length direction of the moving contact piece.

[0070] By setting two opposing permanent magnets 31, a magnetic field can be formed around the stationary contact and the moving contact. Therefore, the electric arc generated between the stationary contact and the moving contact will be elongated in a direction away from each other by the action of the magnetic field, thus extinguishing the arc.

[0071] The arc-extinguishing unit 30 also includes two yoke clips 32, which are positioned corresponding to the two permanent magnets 31. Furthermore, the two yoke clips 32 surround the sealing unit 40 and the two permanent magnets 31. This design of the yoke clips 32 surrounding the permanent magnets 31 prevents the magnetic field generated by the permanent 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.

[0072] As shown in Figures 3 and 4, the sealing unit 40 includes a sealing shell 1000, a pair of stationary contacts 2000, a moving component 3000, and a magnetic circuit portion 4000.

[0073] It should be noted that the sealing housing 1000 is a stationary component, a device that houses the contact assembly and is primarily a housing with a cavity. Furthermore, the sealing housing 1000 can be assembled from multiple components connected in a predetermined assembly manner.

[0074] The sealing shell 1000 has a contact chamber 1001 inside. The sealing shell 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.

[0075] 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, for example, made of 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.

[0076] The sealing housing 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 2000 to pass through. In this embodiment of the present disclosure, the first through holes 1002 are formed on the top of the ceramic cover 1110.

[0077] A pair of stationary contacts 2000 are connected to the ceramic cover 1110 of the sealing housing 1000, with at least a portion of each stationary contact 2000 located within the contact chamber 1001. One of the pair of stationary contacts 2000 serves as a current inflow terminal, and the other serves as a current outflow terminal.

[0078] A pair of stationary contacts 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.

[0079] The bottom of the stationary contact 2000 serves as the stationary contact point, which can be integrally or separately located at the bottom of the stationary contact 2000.

[0080] Please refer to Figures 3 and 4. The moving assembly 3000 includes multiple movable contact assemblies 3100, push rod assemblies 3200, and elastic assemblies 3300 arranged side by side. The movable contact assemblies 3100 are disposed inside the insulating cover 1100 and are mounted on the push rod assembly 3200 via the elastic assemblies 3300.

[0081] It is understood that the number of movable contact components 3100 can be one or more. When there are multiple movable contact components 3100, the multiple movable contact components 3100 are arranged side by side, and the number of contact points formed by the multiple movable contact components 3100 and each stationary contact 2000 is multiple, such as two, three, four, etc.

[0082] It should be noted that if a pair of stationary contacts 2000 and a plurality of movable contact components 3100 are considered as a set of combinations, then the relays of the present disclosure embodiments may include multiple sets of combinations.

[0083] Each movable contact assembly 3100 includes a movable contact piece 3110, and the movable contact pieces 3110 of the plurality of movable contact assemblies 3100 are arranged side by side. Each movable contact piece 3110 is used to make or break contact with a pair of stationary contacts 2000. In the embodiments of this disclosure, each movable contact piece 3110 is used to contact or separate from a pair of stationary contacts 2000 at both ends along a first direction D1. Wherein, the first direction D1 is the arrangement direction of the pair of stationary contacts 2000.

[0084] Each movable contact 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.

[0085] In this embodiment of the present disclosure, the moving component 3000 includes two moving contacts 3110 arranged side by side. One end of each moving contact 3110 is used to contact or separate from the stationary contact of one of the stationary contacts 2000, and the other end of each moving contact 3110 is used to contact or separate from the stationary contact of the other stationary contact 2000. Further, one end of each moving contact 3110 forms two contact points with one of the stationary contacts 2000, and the other end of each moving contact 3110 forms two contact points with the other stationary contact 2000.

[0086] In other embodiments, the number of movable contact pieces 3110 may be one, three, four, five, etc.

[0087] It is understood that the moving assembly 3000 includes multiple moving contacts 3110. Each of the multiple moving contacts 3110 contacts is in contact with or separates from a pair of stationary contacts at both ends along the first direction D1. Since the multiple moving contacts 3110 do not restrict each other, a reliable parallel circuit is formed after each of the multiple moving contacts 3110 contacts a pair of stationary contacts 2000 at both ends along the first direction D1. The number of contact points formed by the multiple moving contacts 3110 and one stationary contact 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.

[0088] Each movable contact assembly 3100 also includes a second magnetic conductor 6200, which is fixedly connected to the side of the movable contact 3110 facing away from the stationary contact 2000. The function of the second magnetic conductor 6200 will be described in detail below.

[0089] As shown in Figures 3 and 4, the direction of movement of the movable contact 3110 is defined as the second direction D2, and the direction perpendicular to the first direction D1 and the second direction D2 is defined as the third direction D3. The push rod assembly 3200 includes a push rod 3210 and a contact 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 contact assemblies 3100 are mounted within the space enclosed by the contact support 3220 via elastic components 3300.

[0090] 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 clips 3213 on both 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 contact pieces 3110 and the base 3211, and is used to apply an elastic force to the plurality of movable contact pieces 3110 to move towards the top wall 3221, thereby providing contact pressure.

[0091] In other embodiments, the contact support 3220 may also have other structures, which will not be listed here. The push rod assembly 3200 may also have other structures, which will not be described in detail here.

[0092] Among them, multiple moving contact pieces 3110 are arranged side by side along the third direction D3.

[0093] Please refer to Figures 3 and 4. The yoke plate 1200 has a second through hole 1210, which extends through the yoke plate 1200 along its thickness direction (second direction D2) and communicates with the contact chamber 1001 of the sealing shell 1000. The rod portion 3212 is movably inserted through the second through hole 1210 along the second direction D2. The base 3211 located at one axial end of the rod portion 3212 is disposed within the contact chamber 1001.

[0094] 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.

[0095] Referring back to 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 formed of insulating material. A metal cover 5000 is inserted inside the coil frame 21. The coil 22 surrounds the coil frame 21.

[0096] As shown in Figures 3 and 4, the magnetic circuit section 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 disposed opposite to the stationary iron core 4300 along the axial direction (second direction D2) 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.

[0097] 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.

[0098] 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 contact 3110 contacts the stationary contact 2000, the moving contact 3110 is stopped by the stationary contact 2000, while the rod 3212 and the base 3211 will continue to move upward until the overtravel is completed.

[0099] 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 contact 3110 to provide contact pressure to the moving contact 3110.

[0100] Please refer to Figures 3 and 4. The relay 1 also includes a first magnetic conductor 610. The first magnetic conductor 610 is used to form an attractive force on the moving contact 3110 in the direction of contact closure. This attractive force can resist the electric repulsive force generated between the moving contact 3110 and the stationary contact 2000 due to the short circuit current, and prevent the moving contact 3110 and the stationary contact 2000 from springing apart.

[0101] In one embodiment, the first magnetic conductor 6100 is disposed on the side of the movable contact 3110 facing away from the elastic component 3300. In other words, the first magnetic conductor 6100 is disposed on the side of the movable contact 3110 facing the stationary contact 2000.

[0102] It is understandable that when the moving contact 3110 is energized, the first magnetic conductor 6100 is magnetized, and the first magnetic conductor 6100 can generate an attractive force on the moving contact 3110 in the direction of contact closure, thereby achieving the purpose of short circuit prevention.

[0103] Furthermore, as described above, the movable contact assembly 3100 may also include a second magnetic conductor 6200, which is fixedly connected to the side of the movable contact 3110 facing the elastic component 3300; in other words, the second magnetic conductor 6200 is fixedly connected to the side of the movable contact 3110 facing away from the stationary contact 2000. The second magnetic conductor 6200 is used to form a magnetic circuit with the first magnetic conductor 6100.

[0104] In one example, the number of second magnetic conductors 6200 corresponds to the number of moving contacts 3110. In this embodiment of the present disclosure, the number of second magnetic conductors 6200 is two, but this is not a limitation. The two second magnetic conductors 6200 are respectively fixedly connected to the side of the two moving contacts 3110 facing away from the stationary contact 2000.

[0105] When the two ends of the moving contact 3110 in the first direction D1 respectively contact a pair of stationary contacts 2000, current flows through the moving contact 3110, thereby forming a magnetic circuit around the moving contact 3110 between the first magnetic conductor 6100 and the second magnetic conductor 6200. When a short-circuit current passes through the moving contact 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 repulsion force generated between the moving contact 3110 and the stationary contact 2000 due to the short-circuit current, preventing the moving contact 3110 from springing away from the stationary contact 2000.

[0106] 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.

[0107] As shown in Figures 3 and 4, the first magnetic conductor 6100 is disposed within the contact chamber 1001 of the sealing shell 1000 and is fixedly disposed relative to the sealing shell 1000. In this way, the short-circuit resistance force is transferred to the sealing shell 1000. Since the sealing shell 1000 is a stationary component, there is no need to configure a large 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.

[0108] Further, as shown in Figure 3, the first magnetic conductor 6100 is connected to the ceramic cover 1110 of the insulating cover 1100 via a connector 6300. The ceramic cover 1110 of the insulating cover 1100 is provided with a third through hole 1111; the connector 6300 is rod-shaped and passes through the third through hole 1111; one end of the connector 6300 is connected to the insulating cover 1100, and the other end is connected to the first magnetic conductor 6100.

[0109] The connection between one axial end of the connector 6300 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 6300 and the first magnetic conductor 6100 can also be implemented in various ways, such as welding, riveting, screwing, bonding, or snap-fitting.

[0110] It is understandable that when the connection between one end of the connector 6300 and the ceramic cover 1110 is made by welding, by welding the connector 6300 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.

[0111] It is understandable that one end of the connector 6300 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.

[0112] It can be seen that the first magnetic conductor 6100 is connected to the ceramic cover 1110 through the connector 6300. On the one hand, the short-circuit resistance force is transferred to the ceramic cover 1110, so there is no need to configure a large 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. On the other hand, since the connector 6300 is connected to the ceramic cover 1110, the connector 6300 will not occupy too much space in the contact chamber, ensuring the arc extinguishing space of the arc extinguishing unit 30 and the movement space of the push rod 3210.

[0113] In addition, the first magnetic conductor 6100 is connected to the rod-shaped connector 6300, so that the first magnetic conductor 6100 and the connector 6300 can be connected in a variety of ways, such as riveting, laser welding, snap-fitting, adhesive bonding, etc., which enriches the connection methods.

[0114] As an example, connector 6300 is a solid rod. Thus, connector 6300 and the first magnetic conductor 6100 can be connected by riveting, making the connection more reliable. Furthermore, the solid rod provides higher support strength and is less prone to deformation.

[0115] Of course, the first magnetic conductor 6100 can also be fixed inside the sealing shell 1000 by means of a fixed bracket (not shown in the figure). For example, the fixed bracket can be located inside the sealing shell 1000 and fixedly connected to the yoke plate 1200, and the first magnetic conductor 6100 can be fixedly connected to the fixed bracket.

[0116] 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.

[0117] 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.

[0118] Optionally, the first magnetic conductor 6100 may include multiple stacked magnetic sheets. 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 made from thin strips, resulting in lower material costs and easier handling. On the other hand, the number of magnetic sheets can be flexibly adjusted according to the magnitude of the short-circuit current.

[0119] It should be noted that the switching process of relay 1 from fully open to fully closed can be divided into two stages: In the first stage, the moving iron core 4400 drives the moving contact 3110 upwards via the push rod assembly 3200 until the moving contact 3110 just contacts the stationary contact 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 element 4500 and the weight of the push rod assembly 3200 and the moving iron core 4400 itself. In the second stage, after the moving contact 3110 contacts the stationary contact 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 attraction 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.

[0120] For easier understanding, Figure 5 can be used as a reference. It should be noted that Figure 5 shows the relationship curves between the attractive force and the magnetic gap. Curve 1 represents the relationship between the attractive force and the magnetic gap, and curve 2 represents the relationship between the reaction force and the magnetic gap in the prior art relay 1.

[0121] As shown in Figure 5, 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 contact 3110 contacts the stationary contact 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 contact 3110 contacts the stationary contact 2000, the elastic force provided by the elastic component 3300 also joins the reaction force. Therefore, curve 2, representing the reaction force, has a sharp increase at a turning point.

[0122] As can be seen from Figure 5, regardless of the size of the magnetic gap, the attraction force must always be greater than the reaction force so that the attraction force can overcome the reaction force to drive the push rod assembly 3200 to move upward, thereby achieving contact closure.

[0123] In the relay 1 of this embodiment, during the overtravel process, the push rod assembly 3200 compresses the elastic component 3300, and the position relative to the moving contact 3110 sequentially has an overtravel initial position, a first transition position, a second transition position, and an overtravel end position. That is, during the process of the push rod assembly 3200 switching from completely open to completely closed, it first passes through the overtravel initial position, then sequentially passes through the first transition position and the second transition position, and finally reaches the overtravel end position.

[0124] As shown in Figure 7, the elastic component 3300 includes a first leaf spring 100, which has a connecting portion 111 and an abutting portion 123. The connecting portion 111 is mounted on one of the push rod assembly 3200 and the movable contact assembly 3100, and the abutting portion 123 slidably abuts against the other of the push rod assembly 3200 and the movable contact assembly 3100.

[0125] As shown in Figures 7 and 15, another of the push rod assembly 3200 and the movable contact assembly 3100 is provided with an abutment surface 310. The abutment surface 310 is configured to abut against the abutment portion 123 during overtravel to increase the compression of the first leaf spring 100 and thus increase the contact pressure.

[0126] In the relay of this embodiment, the push rod assembly 3200 and the movable contact assembly 3100 are provided with an abutment surface 310. The abutment surface 310 can abut against the abutment portion 123. During overtravel, the abutment surface 310 can squeeze the abutment portion 123, further compressing the first leaf spring 100, thereby increasing the compression of the first leaf spring 100, thereby increasing the contact pressure, avoiding poor contact between the moving and stationary contacts due to insufficient contact pressure, reducing the failure rate of the relay, improving the reliability and stability of the system, and extending the service life of the relay.

[0127] It should be noted that the contact surface 310 can contact the contact part 123 during the entire overtravel process, or the contact surface 310 can contact the contact part 123 at a certain stage during the entire overtravel process.

[0128] In one embodiment, the connecting portion 111 of the first leaf spring 100 is mounted on the push rod assembly 3200, and the movable contact assembly 3100 has an abutment surface 310; in another embodiment, the connecting portion 111 of the first leaf spring 100 is mounted on the movable contact assembly 3100, and the push rod assembly 3200 has an abutment surface 310.

[0129] In one embodiment, the contact surface 310 can be a plane or a curved surface.

[0130] When the movable contact component 3100 has an abutment surface 310, the abutment surface 310 can be disposed on the movable contact piece 3110 or on the second magnetic conductor 6200.

[0131] The following description will be based on the example of the first leaf spring 100's connecting part 111 being mounted on the push rod assembly 3200, and the moving contact piece 3110 having an abutment surface 310.

[0132] As shown in Figures 7 and 15, the moving contact 3110 has a groove 300 on the side facing away from the stationary contact 2000, and the opening of the groove 300 faces the base of the push rod assembly 3200. At least a portion of the abutment portion 123 is located within the groove 300, and the groove sidewall of the groove 300 has an abutment surface 310.

[0133] In this embodiment of the present disclosure, another of the push rod assembly 3200 and the movable contact assembly 3100 is provided with a groove 300. At least a portion of the abutment portion 123 is located in the groove 300. The groove sidewall of the groove 300 has an abutment surface 310. When the abutment portion 123 does not abut against the abutment surface 310, at least a portion of the abutment portion 123 is located in the groove 300. The groove 300 plays a limiting role for the abutment portion 123, preventing the first leaf spring 100 from deflecting relative to the movable contact assembly 3100.

[0134] In one embodiment, the groove 300 has a bottom surface 301, an abutment surface 310 connected to the bottom surface 301, and extends from the bottom surface 301 in a direction away from the push rod assembly 3200.

[0135] As shown in Figures 7 to 10, before the push rod assembly 3200 moves from the overtravel initial position to the second transition position, the bottom wall of the groove 300 abuts against the abutment portion 123; during the process of the push rod assembly 3200 moving from the second transition position to the overtravel end position, the abutment surface 310 abuts against the abutment portion 123.

[0136] In other words, in the embodiments of this disclosure, in the first half of the overtravel, the abutting surface 310 does not abut against the abutting part 123, but the abutting part 123 slidably abuts against the bottom wall of the groove 300; when the overtravel reaches the second half, the abutting surface 310 begins to abut against the abutting part 123, thereby increasing the compression of the first leaf spring 100 and thus increasing the contact pressure.

[0137] Specifically, when the movable contact assembly 3100 has a groove 300 and the groove sidewall of the groove 300 has an abutment surface 310, the abutment surface 310 extends from the bottom wall of the groove 300 in a direction away from the stationary contact 2000 and away from the push rod assembly 3200. When the push rod assembly 3200 has a groove 300 and the groove sidewall of the groove 300 has an abutment surface 310, the abutment surface 310 extends from the bottom wall of the groove 300 in a direction close to the stationary contact 2000 and away from the push rod assembly 3200.

[0138] As shown in Figure 7, the abutment portion 123 has two sub-parts 123a, which are respectively disposed at both ends of the first leaf spring 100 along the length direction (first direction) of the movable contact piece 3110, and are used to abut against the push rod assembly 3200 and the other of the movable contact assembly 3100.

[0139] The contact surface 310 has two inclined surfaces 311, which are arranged opposite to each other along the length of the movable contact piece 3110. The two inclined surfaces 311 are configured to abut against the two sub-parts 123a respectively during overtravel.

[0140] In this embodiment of the present disclosure, the first leaf spring 100 has sub-parts 123a at both ends along its length, and the movable contact piece 3110 has two grooves 300, each groove 300 having a slope 311. During overtravel, the two sub-parts 123a are used to abut against the two slopes 311 respectively.

[0141] Of course, the abutment surface 310 is not limited to being formed on the sidewall of the groove 300. For example, in other embodiments, the abutment surface 310 may also be formed on a protrusion.

[0142] In other embodiments, the movable contact component 3100 may have a groove 300, which is elongated and extends along a first direction D1. The groove 300 has two inclined surfaces 311, at least a portion of each sub-part 123a is located within the groove 300, and the two sub-parts 123a abut against the two inclined surfaces 311 respectively.

[0143] As an example, the moving contact 3110 has a protrusion on its surface facing away from the stationary contact 2000, and the outer peripheral side of the protrusion has an abutment surface 310. Before the push rod assembly 3200 moves from the overtravel initial position to the second transition position, the abutment portion 123 abuts against the surface of the moving contact 3110 facing away from the stationary contact 2000, but does not contact the abutment surface 310. During the movement of the push rod assembly 3200 from the second transition position to the overtravel end position, the abutment portion 123 abuts against the abutment surface 310.

[0144] To further improve the contact pressure without increasing the coil power consumption, this disclosure further improves the elastic component 3300 so as to reduce the coil power consumption without affecting the attraction force matching, and can also ensure a sufficiently large contact pressure.

[0145] As shown in Figure 5, curve 3 represents the relationship between the attractive force and the magnetic gap after the coil power consumption is reduced. Comparing curves 1 and 3, when the magnetic gap is the same value, the attractive force corresponding to curve 3 is less than that corresponding to curve 1. At this time, if the contact pressure is kept constant and the coil power consumption is directly reduced (the coil power consumption decreases, and the attractive force decreases), then curves 2 and 3 will intersect during the entire contact closing process, and at the intersection, the attractive force is less than the reaction force (i.e., the attractive force and reaction force are mismatched), causing relay 1 to fail to close.

[0146] It is evident that contact pressure and coil power consumption cannot be balanced, which obviously hinders the development of relay 1.

[0147] In the relay 1 of this disclosure embodiment, the stiffness coefficient of the elastic component 3300 is variable, which reduces coil power consumption without affecting the matching of the pull-back force, and can also ensure a sufficiently large contact pressure.

[0148] As shown in Figure 8, the elastic component 3300 has a first fulcrum O1 and a second fulcrum O2. The elastic component 3300 also includes a second leaf spring 200. The first leaf spring 100 and the second leaf spring 200 are stacked, and the second leaf spring 200 is located on the side of the first leaf spring 100 facing away from the stationary contact 2000. The first leaf spring 100 and the second leaf spring 200 are connected to one of the push rod assembly 3200 and the movable contact assembly 3100. It should be noted that, in one embodiment, the first leaf spring 100 and the second leaf spring 200 are connected to the push rod assembly 3200, and the first leaf spring 100 abuts against the movable contact assembly 3100; in another embodiment, the first leaf spring 100 and the second leaf spring 200 are connected to the movable contact assembly 3100, and the first leaf spring 100 abuts against the push rod assembly 3200. The following explanation will take the example of the first spring 100 and the second spring 200 being connected to the push rod assembly 3200, with the first spring 100 abutting against the movable contact assembly 3100.

[0149] Before the push rod assembly 3200 moves from the overtravel initial position to the first transition position, the first leaf spring 100 deforms around the first fulcrum O1 and has a first lever arm; during this process, the abutment portion 123 does not abut against the abutment surface 310. During the movement of the push rod assembly 3200 from the first transition position to the second transition position, a portion of the first leaf spring 100 deforms around the second fulcrum O2 and has a second lever arm; during this process, the abutment portion 123 does not abut against the abutment surface 310. The lengths of the first lever arm and the second lever arm are not equal.

[0150] Wherein, the stiffness coefficient of the first leaf spring 100 is less than or equal to the stiffness coefficient of the second leaf spring 200. Further, the thickness of the first leaf spring 100 is less than or equal to the thickness of the second leaf spring 200. In one embodiment, the connection position of the first leaf spring 100, the second leaf spring 200 and the push rod assembly 3200 forms a first fulcrum O1, and the contact position of the first leaf spring 100 and the second leaf spring 200 forms a second fulcrum O2. Before the push rod assembly 3200 moves from the overtravel initial position to the first transition position, the first leaf spring 100 is compressed by the push rod assembly 3200 and deforms with the first fulcrum O1 as the rotation point. The two ends of the second leaf spring 200 along the length direction (first direction D1) of the movable contact piece 3110 do not contact the first leaf spring 100 and do not deform. At this time, the elastic component 3300 has a first stiffness coefficient. During the process of the push rod assembly 3200 moving from the first transition position to the second transition position, the second leaf spring 200 contacts the first leaf spring 100, and part of the first leaf spring 200... When the first spring 100 deforms around the contact point (second fulcrum O2) between the first spring 100 and the second spring 200, the elastic component 3300 has a second stiffness coefficient. During the movement of the push rod assembly 3200 from the second transition position to the overtravel end position, both the first spring 100 and the second spring 200 deform around the first fulcrum O1, and the abutting part 123 abuts against the abutting surface 310. At this time, the elastic component 3300 has a third stiffness coefficient. The third stiffness coefficient is greater than the second stiffness coefficient and greater than the first stiffness coefficient.

[0151] It should be noted that the overtravel initial position refers to the position of the push rod assembly 3200 relative to the moving contact 3110 when the push rod assembly 3200 drives the moving contact 3110 to just make contact with the stationary contact 2000; the overtravel end position refers to the position of the push rod assembly 3200 relative to the moving contact 3110 after the moving iron core 4400 makes contact with the stationary iron core 4300 (i.e., the magnetic gap is equal to zero).

[0152] In this embodiment, before the push rod assembly 3200 moves relative to the movable contact 3110 from the overtravel initial position to the first transition position, the elastic component 3300 has a first stiffness coefficient. During the movement of the push rod assembly 3200 relative to the movable contact 3110 from the first transition position to the second transition position, the elastic component 3300 has a second stiffness coefficient. During the movement of the push rod assembly 3200 from the second transition position to the overtravel end position, the elastic component 3300 has a third stiffness coefficient. Since the third stiffness coefficient is greater than the second stiffness coefficient and the first stiffness coefficient, the relationship curve between the reaction force and the magnetic gap during the overtravel process of the push rod assembly 3200 squeezing the elastic component 3300 is a broken line (curve 4 in Figure 5).

[0153] It should be noted that the first half of curve 4 (i.e., the stage before the push rod assembly 3200 drives the moving contact piece 3110 to move and contacts the stationary contact 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.

[0154] As shown in Figure 5, 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.

[0155] In this embodiment of the disclosure, 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 first transition position, it corresponds to point C of curve 4; when the push rod assembly 3200 is in the second transition position, it corresponds to point D of curve 4.

[0156] 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 disclosure is a broken line segment A'CDB'. The slope of line segment A'C is less than the slope of line segment AB, the slope of line segment AB is less than the slope of line segment DB', and the slope of line segment CD can be less than, greater than, or equal to the slope of line segment AB, as long as line segment CD is located below line segment AB.

[0157] In this embodiment, since the slope of line segment A'C is less than the slope of line segment AB, the slope of line segment CD is less than the slope of line segment AB, and the slope of line segment DB' is greater than the slope of line segment AB, curve 3 will not intersect with A'CDB'. 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).

[0158] Therefore, in the relay 1 of this embodiment, the elastic component 3300 includes a first leaf spring 100 and a second leaf spring 200. Before the push rod assembly 3200 moves from the overtravel initial position to the first transition position, the two ends of the second leaf spring 200 along the length direction (first direction D1) of the movable contact 3110 do not contact the first leaf spring 100. During the process of the push rod assembly 3200 moving from the first transition position to the overtravel end position, the two ends of the second leaf spring 200 along the length direction (first direction D1) of the movable contact 3110 respectively contact the first leaf spring 100, so that when the elastic component 3300 is squeezed by the push rod assembly 3200, the elastic component 3300 exhibits three different stiffness coefficients, namely the first stiffness coefficient corresponding to the A'C line segment, the second stiffness coefficient corresponding to the CD line segment, and the third stiffness coefficient corresponding to the D B' line segment. During the movement of the push rod assembly 3200 from the initial overtravel position to the first transition position, the first stiffness coefficient of the elastic component 3300 is relatively small. During the movement of the push rod assembly 3200 from the second transition position to the end of the overtravel position, the third stiffness coefficient of the elastic component 3300 is relatively large. This results in a broken line segment in 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 attraction force will not be less than the reaction force, ensuring reliable closure of relay 1. Simultaneously, because the stiffness coefficient of the elastic component 3300 is relatively large during the transition from the transition position to the end of the overtravel position, the reaction force is also relatively large when the push rod assembly 3200 moves relative to the moving contact 3110 to the end of the overtravel position, thereby increasing the contact pressure. While ensuring sufficient contact pressure, the coil power consumption can be reduced.

[0159] Furthermore, referring to Figure 5, if the coil power consumption remains constant, i.e., 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 of this embodiment can increase the reaction force while maintaining a constant coil power consumption, thereby increasing the contact pressure.

[0160] As shown in Figures 6, 7 and 11, the first leaf spring 100 includes a first base plate 110 and a first extension arm 120. The first base plate 110 has a connecting portion 111. The first extension arm 120 is provided at both ends of the first base plate 110 along the length direction (first direction D1) of the movable contact piece 3110. The first extension arm 120 is bent and connected to the first base plate 110.

[0161] As shown in Figure 6, the first extension arm 120 may include a first segment 121 and a second segment 122. The first segment 121 is bent and connected to the first substrate 110, and the second segment 122 is connected to the end of the first segment 121 away from the first substrate 110. The end of the second segment 122 away from the first segment 121 has an abutment portion 123. The first segment 121 and the second segment 122 are set at an angle.

[0162] The second leaf spring 200 includes a second base plate 210 and a second extension arm 220. The second base plate 210 is stacked with the first base plate 110, and the connection position between the second base plate 210, the first base plate 110, and the push rod assembly 3200 forms a first fulcrum O1. The second base plate 210 has second extension arms 220 at both ends along the length direction (first direction D1) of the movable contact piece 3110; the second extension arms 220 are bent and connected to the second base plate 210. The end of the second extension arm 220 away from the second base plate 210 is used to contact the first extension arm 120 of the first leaf spring 100, and the contact position forms a second fulcrum O2. Before the push rod assembly 3200 moves from the overtravel initial position to the first transition position, the second extension arm 220 does not contact the first leaf spring 100. During the process of the push rod assembly 3200 moving from the first transition position to the overtravel end position, the second extension arm 220 contacts the corresponding first extension arm 120, forming the second fulcrum O2. During the movement of the push rod assembly 3200 from the first transition position to the second transition position, the portion of the first extension arm 120 of the first leaf spring 100 extending beyond the second fulcrum O2 along the length direction (first direction D1) of the movable contact piece 3110 deforms with the second fulcrum O2 as the rotation point. Furthermore, the portion of the first leaf spring 100 extending beyond the second fulcrum O2 has an abutment portion 123.

[0163] The first extension arms 120 at both ends of the first substrate 110 correspond to the positions of the second extension arms 220 at both ends of the second substrate 210; the corresponding positions of the first extension arms 120 and the second extension arms 220 in contact form the second fulcrum O2.

[0164] The first substrate 110 and the second substrate 210 are connected to one of the movable contact assembly 3100 and the push rod assembly 3200. The first extension arm 120 bends from the first substrate 110 toward the other side of the movable contact assembly 3100 and the push rod assembly 3200. The second extension arm 220 bends from the second substrate 210 toward the other side of the movable contact assembly 3100 and the push rod assembly 3200.

[0165] As shown in Figure 7, in this embodiment of the present disclosure, the first leaf spring 100 and the second leaf spring 200 are located between the movable contact assembly 3100 and the push rod assembly 3200. The first base plate 110 of the first leaf spring 100 is connected to the base 3211 of the push rod assembly 3200, and the first extension arm 120 of the first leaf spring 100 abuts against the movable contact plate 3110 of the movable contact assembly 3100. The second leaf spring 200 is located on the side surface of the first leaf spring 100 facing away from the movable contact assembly 3100, and the second base plate 210 of the second leaf spring 200 is connected to the base 3211 of the push rod assembly 3200.

[0166] As shown in Figure 6, there are two first leaf springs 100, and the first base plates 110 of the two first leaf springs 100 are integrally connected. There are two second leaf springs 200, and the second base plates 210 of the two second leaf springs 200 are integrally connected.

[0167] As shown in Figure 7, the geometric centers of the first leaf spring 100 and the second leaf spring 200 lie on the axis of the push rod assembly 3200. The second extension arms 220 located at both ends of the second base plate 210 along the length direction (first direction D1) of the movable contact piece 3110 are symmetrically arranged with respect to the axis of the push rod assembly 3200. Along the length direction (first direction D1) of the movable contact piece 3110, the length L2 of the second leaf spring 200 is less than the length L1 of the first leaf spring 100.

[0168] It is understandable that the second leaf spring 200 contacts the first leaf spring 100 to form the second fulcrum O2. The position of the second fulcrum O2 can be adjusted by adjusting the contact position, thereby adjusting the size of the lever arm. This allows for greater design freedom and wider applicability.

[0169] The deformation process of the first leaf spring 100 and the second leaf spring 200 during the overtravel process is explained below with reference to Figures 7 to 10 and Figure 5.

[0170] As shown in Figure 7, the push rod assembly 3200 is in the overtravel initial position relative to the movable contact piece 3110. At this time, the elastic component 3300 is in the initial state. It should be noted that in the initial state, the elastic component 3300 has initial deformation and can provide initial elastic force to the movable contact assembly 3100. The initial elastic force provided by the elastic component 3300 is provided by the initial deformation of the first leaf spring 100. Furthermore, when the elastic component 3300 is in the initial state, the second extension arm 220 of the second leaf spring 200 is not in contact with the first leaf spring 100.

[0171] As shown in Figure 8, during the movement of the push rod assembly 3200 from the overtravel initial position to the first transition position, the first leaf spring 100 is compressed by the push rod assembly 3200 and deforms around the first fulcrum O1. Since the second extension arm 220 of the second leaf spring 200 does not contact the first leaf spring 100 before the push rod assembly 3200 moves to the first transition position, the second leaf spring 200 does not deform during the movement of the push rod assembly 3200 from the overtravel initial position to the first transition position. The abutment portion 123 abuts against the bottom wall of the groove 300, while the abutment surface 310 does not contact the abutment portion 123. During this process, the elastic component 3300 has a first stiffness coefficient.

[0172] It is understandable that the state shown in Figure 8 can be considered as the push rod assembly 3200 being in the first transition position, or it can be considered as the push rod assembly 3200 being in an intermediate process position between the overtravel initial position and the first transition position. When the push rod assembly 3200 is in the first transition position, the deformation state of the elastic component 3300 corresponds to point C in curve 4 in Figure 5.

[0173] As shown in Figure 9, during the movement of the push rod assembly 3200 from the first transition position to the second transition position, the portion of the first leaf spring 100 extending beyond the second fulcrum O2 deforms with the second fulcrum O2 as the rotation point. The abutting portion 123 slides relative to the moving contact piece 3110 along the bottom wall of the groove 300 towards the abutting surface 310, without contacting the abutting surface 310. At this time, the elastic component 3300 has a second stiffness coefficient.

[0174] It is understandable that the state shown in Figure 9 can be considered as the push rod assembly 3200 being in the second transition position, or it can be considered as the push rod assembly 3200 being in an intermediate position between the first transition position and the second transition position. When the push rod assembly 3200 is in the second transition position, the deformation state of the elastic component 3300 corresponds to point D in curve 4 in Figure 5.

[0175] As shown in Figure 10, during the movement of the push rod assembly 3200 from the second transition position to the overtravel end position, both the first leaf spring 100 and the second leaf spring 200 deform around the first fulcrum O1. At this time, the elastic component 3300 has a third stiffness coefficient. During the movement of the push rod assembly 3200 from the second transition position to the overtravel end position, it can be considered that the first leaf spring 100 undergoes greater deformation, and the second leaf spring 200 begins to deform. During this process, the abutment surface 310 contacts the abutment portion 123, and the abutment portion 123 slidably abuts against the abutment surface 310.

[0176] It should be noted that during the movement of the push rod assembly 3200 from the second transition position to the overtravel end position, the portion of the first leaf spring 100 extending beyond the second leaf spring 200 may or may not deform around the second fulcrum O2. When the stiffness of the second leaf spring 200 is sufficiently high, the portion of the first leaf spring 100 extending beyond the second leaf spring 200 can deform around the second fulcrum O2.

[0177] Therefore, as the push rod assembly 3200 moves from the second transition position to the overtravel end position, the contact pressure is increased not only by the first leaf spring 100 undergoing greater deformation and the second leaf spring 200 beginning to deform, but also by the abutment portion 123 slidably abutting against the abutment surface 310. Thus, the contact pressure is significantly increased under the combined effect of these two mechanisms.

[0178] As shown in Figure 12, the similarities between the moving component 3000 of the second embodiment and the moving component 3000 of the first embodiment will not be repeated here. The differences are as follows:

[0179] The movable contact assembly 3100 is of one type, and includes a movable contact piece 3110 and a second magnetic conductor 6200. The first leaf spring 100 includes a first base plate 110 and two first extension arms 120, with a first extension arm 120 provided at each end of the first base plate 110 along the first direction D1. The second leaf spring 200 includes a second base plate 210 and two second extension arms 220, with a second extension arm 220 provided at each end of the second base plate 210 along the first direction D1.

[0180] As shown in Figure 13, the similarities between the moving component 3000 of the third embodiment and the moving component 3000 of the first embodiment will not be repeated here. The differences are as follows:

[0181] There are three movable contact components 3100, each of which includes a movable contact piece 3110 and a second magnetic conductor 6200. There are three first leaf springs 100, and the first base pieces 110 of the three first leaf springs 100 are integrally connected. There are three second leaf springs 200, and the second base pieces 210 of the three second leaf springs 200 are integrally connected.

[0182] As shown in Figure 14, the similarities between the moving component 3000 of the fourth embodiment and the moving component 3000 of the first embodiment will not be repeated here. The differences are as follows:

[0183] The second leaf spring 200 in the fourth embodiment has a different shape than the second leaf spring 200 in the first embodiment. In this embodiment, the first leaf spring 100 and the second leaf spring 200 have the same shape and are stacked on top of each other, and the first leaf spring 100 and the second leaf spring 200 have the same length along the first direction D1.

[0184] In this embodiment, during the movement from the initial overtravel position to the first transition position, the first leaf spring 100 deforms around the first fulcrum O1, and the elastic component 3300 has a first stiffness coefficient during this process. During the movement from the first transition position to the end of the overtravel position, both the first leaf spring 100 and the second leaf spring 200 deform around the first fulcrum O1, and the elastic component 3300 has a second stiffness coefficient during this process. The second stiffness coefficient is greater than the first stiffness coefficient, therefore the stiffness coefficient of the elastic component 3300 is variable. Designing the first leaf spring 100 and the second leaf spring 200 to be of equal length can improve the versatility of parts and increase assembly efficiency.

[0185] In summary, the relays of the present disclosure embodiments have at least the following advantages and beneficial effects:

[0186] In the relay of this embodiment, another of the push rod assembly 3200 and the movable contact assembly 3100 is provided with an abutment surface 310. The abutment surface 310 can abut against the abutment portion 123. During overtravel, the abutment surface 310 can squeeze the abutment portion 123, further compressing the first leaf spring 100, thereby increasing the compression of the first leaf spring 100, thereby increasing the contact pressure, avoiding poor contact due to insufficient contact pressure, reducing the failure rate of the relay, improving the reliability and stability of the system, and extending the service life of the relay.

[0187] Furthermore, another of the push rod assembly 3200 and the movable contact assembly 3100 is provided with a groove 300. At least a portion of the abutment portion 123 is inside the groove 300. The groove sidewall of the groove 300 has an abutment surface 310. When the abutment portion 123 does not abut against the abutment surface 310, at least a portion of the abutment portion 123 is located inside the groove 300. The groove 300 plays a limiting role for the abutment portion 123, preventing the first leaf spring 100 from deflecting relative to the movable contact assembly 3100.

[0188] Furthermore, the elastic component 3300 also has a second fulcrum O2. Before moving from the initial overtravel position to the first transition position, the first leaf spring 100 deforms. During the movement from the first transition position to the second transition position, a portion of the first leaf spring 100 deforms. During the movement from the second transition position to the end of the overtravel position, both the first leaf spring 100 and the second leaf spring 200 deform simultaneously. Therefore, the stiffness coefficient of the elastic component 3300 is variable, making the relationship curve between the reaction force and the magnetic gap a broken line throughout the entire overtravel process, thus balancing contact pressure and coil power consumption. In addition, the two leaf springs improve the overall mechanical fatigue resistance of the elastic component. Furthermore, during the movement from the second transition position to the end of the overtravel position, the simultaneous deformation of the two leaf springs further enhances the overall mechanical fatigue resistance of the elastic component.

[0189] Furthermore, the second leaf spring 200 contacts the first leaf spring 100 to form a second fulcrum O2. The position of the second fulcrum O2 can be adjusted by adjusting the contact position, thereby adjusting the size of the lever arm, which provides greater design freedom and stronger applicability.

[0190] Furthermore, the elastic component includes a first leaf spring 100 and a second leaf spring 200. During the movement from the initial overtravel position to the first transition position, the first leaf spring 100 deforms. During the movement from the first transition position to the end of the overtravel position, both the first leaf spring 100 and the second leaf spring 200 deform simultaneously. Therefore, the stiffness coefficient of the elastic component 3300 is variable. Designing the first leaf spring 100 and the second leaf spring 200 to be of equal length can improve the versatility of the parts and increase assembly efficiency.

[0191] It is understood that the various embodiments / implementations provided in this disclosure can be combined with each other without creating contradictions, and will not be described in detail here.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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, comprising: Push rod assembly; Movable contact components, including movable contact pieces; and An elastic component includes a first leaf spring having a connecting portion and an abutting portion, the connecting portion being mounted on one of the push rod assembly and the movable contact assembly, and the abutting portion being slidably abutting against the other of the push rod assembly and the movable contact assembly; The push rod assembly and the movable contact assembly are provided with an abutting surface, which is configured to abut the abutting part to increase the compression of the first leaf spring.

2. The relay according to claim 1, wherein, The push rod assembly and the movable contact assembly are provided with a groove, the opening of the groove facing one of the push rod assembly and the movable contact assembly; at least a portion of the abutment portion is located within the groove, and the groove sidewall has the abutment surface.

3. The relay according to claim 2, wherein, During the overtravel process, the push rod assembly compresses the first leaf spring, and the position of the push rod assembly relative to the moving contact piece sequentially includes the overtravel initial position, the second transition position, and the overtravel end position; Before the push rod assembly moves from the overtravel initial position to the second transition position, the bottom wall of the groove abuts against the abutting part; during the process of the push rod assembly moving from the second transition position to the overtravel end position, the abutting surface abuts against the abutting part.

4. The relay according to claim 3, wherein, The groove has a bottom surface, the abutting surface is connected to the bottom surface and extends from the bottom surface in a direction away from the push rod assembly.

5. The relay according to claim 1, wherein, The abutting part has two sub-parts, which are respectively disposed at both ends of the first leaf spring along the length direction of the movable contact piece, for abutting against the push rod assembly and the other side of the movable contact assembly; The contact surface has two inclined surfaces, which are arranged opposite each other along the length of the movable contact piece. The two inclined surfaces are configured to abut against the two sub-parts respectively during overtravel.

6. The relay according to claim 1, wherein, The connecting part is mounted on the push rod assembly, the abutting part abuts against the movable contact piece, and the movable contact piece has the abutting surface.

7. The relay according to claim 1, wherein, The relay also includes a pair of stationary contacts, and the moving contact is used to make or break contact with the pair of stationary contacts; The relay also includes a first magnetic conductor, which is located on the side of the moving contact facing the stationary contact.

8. The relay according to claim 7, wherein, The movable contact assembly further includes a second magnetic conductor, which is connected to the side of the movable contact piece facing away from the stationary contact. The first magnetic conductor and the second magnetic conductor are used to form a magnetic circuit. The connecting part is mounted on the push rod assembly, and the abutting part abuts against the second magnetic conductor, the second magnetic conductor having the abutting surface.

9. The relay according to claim 1, wherein, The elastic component further includes a second leaf spring stacked on top of the first leaf spring. The first leaf spring and the second leaf spring are mounted on one of the push rod assembly and the movable contact assembly, and their connection position forms a first fulcrum. During the overtravel process, the push rod assembly squeezes the elastic component, and has an overtravel initial position and a first transition position relative to the position of the moving contact piece; Before the push rod assembly moves from the overtravel initial position to the first transition position, the first leaf spring deforms around the first fulcrum and has a first lever arm, during which the abutting part does not abut against the abutting surface; at the first transition position, the first leaf spring and the second leaf spring are in contact.

10. The relay according to claim 9, wherein, The contact position of the first leaf spring and the second leaf spring forms a second fulcrum; during the overtravel process, the position of the push rod assembly relative to the moving contact piece also has a second transition position; during the process of the push rod assembly moving from the first transition position to the second transition position, part of the first leaf spring deforms with the second fulcrum as the rotation point and has a second lever arm, and the abutting part does not abut against the abutting surface; The length of the first lever arm is not equal to the length of the second lever arm.

11. The relay according to claim 10, wherein, During the overtravel process, the position of the push rod assembly relative to the moving contact piece also has an overtravel end position; During the movement of the push rod assembly from the second transition position to the overtravel end position, both the first leaf spring and the second leaf spring deform around the first fulcrum as the rotation point, and the abutting part abuts against the abutting surface.

12. The relay according to claim 10, wherein, The second leaf spring includes a second base plate and a second extension arm; The second substrate and the connecting part are mounted on one of the push rod assembly and the movable contact assembly. The second substrate is provided with the second extension arm at both ends along the length direction of the movable contact piece. The second extension arm is bent and connected to the second substrate. The end of the second extension arm away from the second substrate contacts the first leaf spring, and the contact position forms a second fulcrum. Before the push rod assembly moves from the overtravel initial position to the first transition position, the second leaf spring is not compressed by the push rod assembly and does not deform; during the process of the push rod assembly moving from the first transition position to the second transition position, the second extension arm contacts the first leaf spring, and the portion of the first leaf spring extending beyond the second fulcrum along the length direction of the movable contact plate deforms with the second fulcrum as the rotation point, and the portion of the first leaf spring extending beyond the second fulcrum has the abutment portion.

13. The relay according to claim 12, wherein, The first leaf spring includes a first base plate and a first extension arm, wherein the first base plate has the connecting portion; The first substrate and the second substrate are stacked, and the connecting portion of the first substrate and the second substrate are mounted on one of the push rod assembly and the movable contact assembly, and the connecting position forms the first fulcrum; The first substrate has first extension arms at both ends along the length of the movable contact piece, and the first extension arms are bent and connected to the first substrate. The positions of the first extension arms at both ends of the first substrate correspond to the positions of the second extension arms at both ends of the second substrate, and the positions where the corresponding first extension arms and second extension arms contact each other form the second fulcrum.

14. The relay according to claim 13, wherein, The first extension arm bends from the first substrate toward another point closer to the movable contact assembly and the push rod assembly.

15. The relay according to claim 9, wherein, The stiffness coefficient of the first leaf spring is less than or equal to that of the second leaf spring.

16. The relay according to claim 15, wherein, The thickness of the first leaf spring is less than or equal to the thickness of the second leaf spring.

17. The relay according to claim 9, wherein, During the overtravel process, the position of the push rod assembly relative to the moving contact piece also has an overtravel end position; During the movement of the push rod assembly from the first transition position to the overtravel end position, both the first leaf spring and the second leaf spring deform around the first fulcrum.

18. The relay according to claim 17, wherein, The lengths of the first leaf spring and the second leaf spring are equal.

19. The relay according to claim 1, wherein, The contact surface can be a plane or a curved surface.

20. The relay according to claim 1, wherein, The contact surface is configured to abut the contact portion during overtravel.

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