Relay

Abstract

The present application discloses a relay, comprising a push rod assembly, a movable contact assembly, and an elastic assembly. The movable contact assembly comprises a movable contact blade; the elastic assembly is connected to the push rod assembly and the movable contact assembly, and is used for providing contact pressure to the movable contact blade; the elastic assembly comprises a first fulcrum and a second fulcrum; and the elastic assembly has a first moment arm when pressed by the push rod assembly to deform with the first fulcrum as a rotation point, and the elastic assembly has a second moment arm when pressed by the push rod assembly to deform with the second fulcrum as a rotation point, wherein the length of the first moment arm is not equal to the length of the second moment arm.

Description

relay

[0001] This disclosure claims priority to Chinese patent application No. 202410174225.2 filed on February 7, 2024, the entire contents of which are incorporated herein by reference. Technical Field

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

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

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

[0005] In the prior art, to ensure good electrical connection between the moving and stationary contacts, increasing contact pressure is often employed, i.e., increasing the elastic force of the elastic component. Increasing the elastic force of the elastic component also increases the power consumption of the coil unit. Therefore, prior art relays cannot achieve both high contact pressure and low coil power consumption. Summary of the Invention

[0006] An embodiment of the present application provides a relay that solves the technical problems existing in the prior art by providing an elastic component with a variable stiffness coefficient to achieve both high contact pressure and low coil power consumption.

[0007] The relay of the embodiment of the present application includes:

[0008] Push rod assembly;

[0009] A movable contact assembly, including a movable contact piece;

[0010] An elastic component is connected to the push rod assembly and the movable contact assembly, and is used to provide contact pressure to the movable contact piece; the elastic component has a first fulcrum and a second fulcrum, and when the elastic component is squeezed by the push rod assembly and deformed with the first fulcrum as the rotation point, it has a first lever arm, and when the elastic component is squeezed by the push rod assembly and deformed with the second fulcrum as the rotation point, it has a second lever arm, and the length of the first lever arm is not equal to the length of the second lever arm.

[0011] According to some embodiments of the present application, during the overtravel process, the push rod assembly squeezes the elastic assembly, and has an overtravel initial position, a transition position and an overtravel end position relative to the position of the moving contact piece in sequence; before the push rod assembly moves from the overtravel initial position to the transition position, the elastic assembly is deformed with one of the first fulcrum and the second fulcrum as the rotation point; during the process of the push rod assembly moving from the transition position to the overtravel end position, the elastic assembly is deformed with the other of the first fulcrum and the second fulcrum as the rotation point.

[0012] According to some embodiments of the present application, the elastic assembly includes a first leaf spring and a second leaf spring stacked together, wherein the first leaf spring and the second leaf spring are both connected to one of the push rod assembly and the movable contact assembly, and the connection position forms the first fulcrum, and the contact position of the first leaf spring and the second leaf spring forms the second fulcrum;

[0013] Among them, before the push rod assembly moves from the over-travel initial position to the transition position, part of the first leaf spring is deformed with the second fulcrum as the rotation point; during the process of the push rod assembly moving from the transition position to the over-travel end position, both the first leaf spring and the second leaf spring are deformed with the first fulcrum as the rotation point.

[0014] According to some embodiments of the present application, the second leaf spring includes a second base sheet;

[0015] At least one second extension arm is respectively provided at both ends of the second substrate along the length direction of the movable contact piece. The second extension arm is connected to the second substrate and bent relative to the second substrate. An end of the second extension arm away from the second substrate contacts the first leaf spring, and the contact position forms the second fulcrum.

[0016] Wherein, during the movement of the push rod assembly from the overtravel initial position to the transition position, the portion of the first leaf spring that exceeds the second fulcrum along the length direction of the movable contact piece is deformed with the second fulcrum as the rotation point.

[0017] According to some embodiments of the present application, the first leaf spring includes a first base sheet;

[0018] The first substrate and the second substrate are stacked, and the first substrate and the second substrate are both connected to one of the push rod assembly and the movable contact assembly, and the connection position forms the first fulcrum; the first substrate is respectively provided with at least one first extension arm at both ends along the length direction of the movable contact piece, and the first extension arm is connected to the first substrate and bent relative to the first substrate;

[0019] Among them, at least two first extension arms at both ends of the first substrate respectively correspond to the positions of at least two second extension arms at both ends of the second substrate, and the first extension arms contact the corresponding second extension arms during deformation, and the contact position forms the second fulcrum.

[0020] According to some embodiments of the present application, the first extension arm bends from the first substrate toward the other of the movable contact component and the push rod component that is not connected to the first substrate.

[0021] According to some embodiments of the present application, the relay further includes a pair of static contact terminals, and the two ends of the movable contact piece along a first direction are used to respectively contact or separate with the pair of static contact terminals; the first direction is the arrangement direction of the pair of static contact terminals; the length direction of the movable contact piece is parallel to the first direction;

[0022] A plurality of first extension arms are respectively provided at both ends of the first substrate along the first direction, and the plurality of first extension arms at each end of the first substrate are arranged along a third direction and correspond to a plurality of movable contact components arranged along the third direction; wherein the movement direction of the movable contact piece is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0023] According to some embodiments of the present application, the second extension arm bends from the second substrate toward the other of the movable contact component and the push rod component that is not connected to the second substrate.

[0024] According to some embodiments of the present application, the relay further includes a pair of static contact terminals, and the two ends of the movable contact piece along a first direction are used to respectively contact or separate with the pair of static contact terminals; the first direction is the arrangement direction of the pair of static contact terminals; the length direction of the movable contact piece is parallel to the first direction;

[0025] The second substrate is respectively provided with a plurality of second extension arms at both ends along the first direction, and the plurality of second extension arms at each end of the second substrate are arranged along a third direction; wherein the movement direction of the movable contact piece is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0026] According to some embodiments of the present application, the geometric centers of the first leaf spring and the second leaf spring are both located on the center line of the push rod assembly, and the second extension arms located at both ends of the second base plate along the length direction of the moving contact piece are symmetrically arranged about the center line of the push rod assembly.

[0027] According to some embodiments of the present application, the spring constant of the first leaf spring is less than or equal to the spring constant of the second leaf spring.

[0028] According to some embodiments of the present application, the thickness of the first leaf spring is less than or equal to the thickness of the second leaf spring.

[0029] According to some embodiments of the present application, the elastic component includes a third leaf spring, the third leaf spring includes a third base plate, the third base plate is connected to the push rod component, and the connection position forms the first fulcrum;

[0030] At least one third extension arm is respectively provided at both ends of the third base plate along the length direction of the movable contact piece, and the third extension arm contacts the corresponding push rod assembly during deformation, and the contact position forms the second fulcrum;

[0031] Wherein, before the push rod assembly moves from the over-travel initial position to the transition position, the third leaf spring is deformed with the first fulcrum as the rotation point; during the process of the push rod assembly moving from the transition position to the over-travel end position, the third leaf spring is deformed with the second fulcrum as the rotation point.

[0032] According to some embodiments of the present application, each of the third extending arms has a protruding portion protruding in a direction away from the movable contact piece, and the contact position between the protruding portion and the push rod assembly forms the second fulcrum.

[0033] According to some embodiments of the present application, the protrusion is formed by bending the third extension arm.

[0034] According to some embodiments of the present application, the relay further includes:

[0035] a pair of static contact lead-out terminals, wherein the two ends of the movable contact piece along the first direction are used to respectively contact or separate with the pair of static contact lead-out terminals; the first direction is the arrangement direction of the pair of static contact lead-out terminals;

[0036] A first magnetic conductor is provided on a side of the movable contact piece facing the static contact lead-out end.

[0037] According to some embodiments of the present application, the movable contact assembly further includes a second magnetic conductor, which is fixedly connected to the side of the movable contact piece facing away from the static contact lead-out end, and the second magnetic conductor is used to form a magnetic circuit with the first magnetic conductor.

[0038] According to some embodiments of the present application, the elastic component is a leaf spring component.

[0039] According to some embodiments of the present application, the elastic component includes a base and an extension, the base is connected to one of the push rod assembly and the movable contact assembly, and the connection position forms the first fulcrum, one end of the extension is connected to the base, and the other end of the extension is connected to the other one of the push rod assembly and the movable contact assembly that is not connected to the base, and the extension has the second fulcrum.

[0040] According to some embodiments of the present application, the extension portions are provided on two opposite sides of the base portion.

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

[0042] In the relay of the embodiment of the present application, the elastic component has a first fulcrum and a second fulcrum. By adding the second fulcrum, during the overtravel process, the elastic component can be deformed with the first fulcrum and the second fulcrum as the rotation points, thereby making the stiffness coefficient of the elastic component variable to take into account both large contact pressure and low coil power consumption.

[0043] Furthermore, while maintaining the coil power consumption constant, the spring rate of the elastic component can be increased, and the suction force will not be less than the reaction force. Therefore, the relay of the present application embodiment can increase the contact pressure while maintaining the coil power consumption constant.

[0044] Furthermore, the elastic assembly includes a first leaf spring and a second leaf spring. Before moving from the initial overtravel position to the transition position, the first leaf spring deforms. During the transition to the final overtravel position, both the first and second leaf springs deform simultaneously. This results in a variable spring constant for the elastic assembly, resulting in a curve representing the relationship between the reaction force and the magnetic gap as a broken line throughout the overtravel process, ensuring a balance between high contact pressure and low coil power consumption. Furthermore, the two leaf springs enhance the elastic assembly's overall resistance to mechanical fatigue.

[0045] Furthermore, the second leaf spring contacts the first leaf spring to form a second fulcrum, and the position of the second fulcrum can be adjusted by adjusting the contact position, thereby adjusting the length of the lever arm, which provides greater design freedom and greater applicability.

[0046] Furthermore, by providing a third leaf spring with a protruding portion, the purpose of variable spring coefficient of the elastic component can be achieved, which not only takes into account high contact pressure and low coil power consumption, but also saves parts and improves the assemblability of the elastic component. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] FIG1 is an exploded schematic diagram of a relay according to an exemplary embodiment of the present application.

[0048] FIG2 is a schematic structural diagram of a relay according to an exemplary embodiment of the present application, in which a housing and an arc extinguishing unit are omitted.

[0049] FIG3 is a cross-sectional view taken along line AA in FIG2 .

[0050] FIG4 is a cross-sectional view taken along line BB in FIG2 .

[0051] FIG5 is a graph showing the relationship between the suction force, the reaction force and the magnetic gap.

[0052] FIG. 6 is an exploded schematic diagram illustrating an elastic assembly according to an exemplary embodiment.

[0053] FIG. 7 is a schematic diagram showing the elastic component in its initial state.

[0054] FIG. 8 is a schematic diagram showing an elastic component having a first stiffness coefficient.

[0055] FIG. 9 is a schematic diagram showing the elastic component having a second stiffness coefficient.

[0056] FIG10 shows an exploded schematic diagram of the moving assembly and the second magnetic conductor according to the first embodiment of the present application.

[0057] FIG11 is an exploded schematic diagram showing the moving assembly and the second magnetic conductor according to the second embodiment of the present application.

[0058] FIG12 shows an exploded schematic diagram of the moving assembly and the second magnetic conductor according to the third embodiment of the present application.

[0059] FIG13 is a schematic diagram showing a moving assembly and a second magnetic conductor according to a fourth embodiment of the present application, wherein the contact support is omitted.

[0060] FIG14 shows a three-dimensional schematic diagram of the third leaf spring of the present application.

[0061] FIG15 is a schematic diagram showing a moving assembly and a second magnetic conductor according to a fifth embodiment of the present application, wherein the contact bracket is omitted and the protrusion is not in contact with the base.

[0062] FIG. 16 is a partial enlarged view of the X1 portion in FIG. 15 .

[0063] FIG17 is a schematic diagram showing a moving assembly and a second magnetic conductor according to a fifth embodiment of the present application, wherein the contact bracket is omitted and the protrusion is in contact with the base.

[0064] FIG. 18 shows a partial enlarged view of portion X2 in FIG. 17 . DETAILED DESCRIPTION

[0065] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0066] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to the process, method, product, or apparatus.

[0067] In addition, the following will disclose embodiments of the present invention with reference to the accompanying drawings. For the purpose of clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the present invention.

[0068] Furthermore, for the sake of clutter, some conventional structures and components may be depicted in simplified schematic form in the drawings. Furthermore, some features in the drawings may be slightly enlarged or their proportions or dimensions altered to facilitate understanding and appreciation of the technical features of the present invention, but this is not intended to limit the present invention. The actual dimensions and specifications of products manufactured in accordance with the disclosure of this invention may be adjusted based on production requirements, product characteristics, and the following disclosures of this invention. This is hereby stated.

[0069] As shown in Figures 1 and 2, the relay 1 according to the embodiment of the present application includes a housing 10, a coil unit 20, an arc extinguishing unit 30, and a sealing unit 40. The sealing unit 40 is disposed within the housing 10, and the top of the static contact lead-out terminal of the sealing unit 40 is exposed to the outer surface of the housing 10 through an exposure hole 11a in the housing 10. The coil unit 20 and the arc extinguishing unit 30 are both disposed within the housing 10.

[0070] As an example, the housing 10 includes a first shell 11 and a second shell 12, which are connected to form a chamber for accommodating the coil unit 20, the arc extinguishing unit 30, and the sealing unit 40. In the embodiment of the present application, the exposure hole 11a is provided in the first shell 11.

[0071] The arc extinguishing unit 30 is used to extinguish the arc generated between the static contact lead-out terminal and the moving contact piece of the sealing unit 40 .

[0072] As an example, the arc extinguishing unit 30 includes two arc extinguishing magnets 31. The arc extinguishing magnets 31 can be permanent magnets, and each arc extinguishing magnet 31 can be substantially rectangular. The two arc extinguishing magnets 31 are respectively disposed on either side of the sealing unit 40 and are arranged opposite each other along the length direction of the movable contact piece.

[0073] By providing two arc-extinguishing magnets 31 disposed opposite each other, a magnetic field can be formed around the static contact lead-out terminal and the movable contact piece. Therefore, the arc generated between the static contact lead-out terminal and the movable contact piece will be stretched away from each other by the action of the magnetic field, thereby achieving arc extinguishing.

[0074] The arc extinguishing unit 30 also includes two yoke clamps 32, which are arranged corresponding to the positions of the two arc extinguishing magnets 31. In addition, the two yoke clamps 32 surround the sealing unit 40 and the two arc extinguishing magnets 31. The design of the yoke clamps 32 surrounding the arc extinguishing magnets 31 can prevent the magnetic field generated by the arc extinguishing magnets 31 from spreading outward and affecting the arc extinguishing effect. The yoke clamps 32 are made of soft magnetic material. Soft magnetic materials may include but are not limited to iron, cobalt, nickel, and alloys thereof.

[0075] As shown in FIG. 3 and FIG. 4 , the sealing unit 40 includes a contact container 1000 , a pair of static contact lead terminals 2000 , a moving assembly 3000 , and a magnetic circuit portion 4000 .

[0076] It should be noted that the contact container 1000 is a stationary component for accommodating the contact assembly. The contact container 1000 is mainly composed of a shell and has a cavity. In addition, the contact container 1000 can be formed by connecting multiple components in a predetermined assembly method.

[0077] The contact container 1000 has a contact chamber 1001 therein. The contact container 1000 may include an insulating cover 1100 and a yoke plate 1200 . The insulating cover 1100 is disposed on one side surface of the yoke plate 1200 . The insulating cover 1100 and the yoke plate 1200 together enclose the contact chamber 1001 .

[0078] The insulating cover 1100 includes a ceramic cover 1110 and a frame piece 1120. The ceramic cover 1110 is connected to the yoke iron plate 1200 via the frame piece 1120. The frame piece 1120 can be a metal piece with an annular structure, such as an iron-nickel alloy, and one end of the frame piece 1120 is connected to the opening edge of the ceramic cover 1110, for example, by laser welding, brazing, resistance welding, gluing, etc. The other end of the frame piece 1120 is connected to the yoke iron plate 1200, also by laser welding, brazing, resistance welding, gluing, etc. A frame piece 1120 is provided between the ceramic cover 1110 and the yoke iron plate 1200 to facilitate the connection between the ceramic cover 1110 and the yoke iron plate 1200.

[0079] The contact container 1000 further has a pair of first through holes 1002 , which are connected to the contact chamber 1001 . The first through holes 1002 are used to allow the static contact lead terminals 2000 to pass through. In the embodiment of the present application, the first through holes 1002 are formed on the ceramic cover 1110 .

[0080] A pair of static contact lead-out terminals 2000 are connected to the ceramic cover 1110 of the contact container 1000, and at least a portion of each static contact lead-out terminal 2000 is located in the contact chamber 1001. One of the pair of static contact lead-out terminals 2000 serves as a terminal for current inflow, and the other serves as a terminal for current outflow.

[0081] A pair of static contact lead-out terminals 2000 are respectively disposed in the pair of first through holes 1002 and connected to the ceramic cover 1110 , for example, by welding.

[0082] The bottom of the static contact lead-out terminal 2000 serves as a static contact, and the static contact can be provided at the bottom of the static contact lead-out terminal 2000 in an integrated or split manner.

[0083] 3 and 4 , the movable assembly 3000 includes a plurality of movable contact assemblies 3100 , a push rod assembly 3200 , and an elastic assembly 3300 arranged side by side. The movable contact assembly 3100 is disposed in the insulating cover 1100 and is mounted on the push rod assembly 3200 via the elastic assembly 3300 .

[0084] It is understood that there may be one or more movable contact assemblies 3100. When there are multiple movable contact assemblies 3100, the multiple movable contact assemblies 3100 are arranged side by side, and the number of contact points formed between the multiple movable contact assemblies 3100 and each stationary contact terminal 2000 is multiple, for example, two, three, four, etc.

[0085] It should be noted that, if a pair of static contact lead terminals 2000 and a plurality of movable contact assemblies 3100 are regarded as a set of components, then the relay of the embodiment of the present application may include multiple sets of components.

[0086] Each movable contact assembly 3100 includes a movable contact piece 3110, with multiple movable contact pieces 3110 arranged side by side. Each movable contact piece 3110 is configured to contact or separate from a pair of stationary contact leads 2000 at both ends along a first direction D1. The first direction D1 represents the arrangement direction of the pair of stationary contact leads 2000.

[0087] Each movable contact piece 3110 may include a movable spring body and movable contacts disposed at both ends of the movable spring body. The movable contacts may be separate parts connected to the movable spring body. Of course, the movable contacts may also be integrally formed on the movable spring body.

[0088] In the embodiment of the present application, the dynamic assembly 3000 includes two side-by-side movable contact pieces 3110. One end of each movable contact piece 3110 is used to contact or separate with the stationary contact of one of the stationary contact lead-out terminals 2000, and the other end of each movable contact piece 3110 is used to contact or separate with the stationary contact of the other stationary contact lead-out terminal 2000. Specifically, one end of each movable contact piece 3110 forms two contact points with one of the stationary contact lead-out terminals 2000, and the other end of each movable contact piece 3110 forms two contact points with the other stationary contact lead-out terminal 2000.

[0089] In other embodiments, the number of the movable contact pieces 3110 may also be one, three, four, five, etc.

[0090] It is understood that the dynamic assembly 3000 includes multiple dynamic contact pieces 3110, each of which contacts or separates with a pair of static contact leads along the first direction D1. Because the multiple dynamic contact pieces 3110 do not restrict each other, they form a reliable parallel circuit after contacting the pair of static contact leads 2000 along the first direction D1. The number of contact points formed by the multiple dynamic contact pieces 3110 and a static contact lead 2000 is greater than or equal to two, achieving a current shunting effect. In addition, based on the principle that the magnitude of the electromotive repulsive force is proportional to the square of the current, the magnitude of the electromotive repulsive force at each contact point is significantly reduced, which helps improve the short-circuit resistance and enhances the reliability of the relay.

[0091] Each movable contact assembly 3100 further includes a second magnetic conductor 6200, which is fixedly connected to the side of the movable contact piece 3110 facing away from the static contact lead-out terminal 2000. The function of the second magnetic conductor 6200 will be described in detail below.

[0092] As shown in Figures 3 and 4, the movement direction of the movable contact piece 3110 is defined as the second direction D2, and the direction perpendicular to the first direction D1 and the second direction D2 is defined as the third direction D3. The push rod assembly 3200 includes a push rod 3210 and a contact bracket 3220. The contact bracket 3220 includes a top wall 3221 and two side walls 3222. One end of the two side walls 3222 is integrally connected to the two side edges of the top wall 3221 along the third direction D3, and the other ends of the two side walls 3222 are connected to the push rod 3210, forming an inverted U-shaped structure. Multiple movable contact assemblies 3100 are installed in the space enclosed by the contact bracket 3220 via the elastic assembly 3300.

[0093] Each side wall 3222 of the contact support 3220 has a locking hole 3223 at its bottom end. The push rod 3210 includes a base 3211 and a rod portion 3212, with the base 3211 connected to one axial end of the rod portion 3212. Two locking clips 3213 are provided on either side of the base 3211. The two locking clips 3213 respectively snap into the two locking holes 3223 of the contact support 3220, securing the base 3211 to the contact support 3220. The elastic assembly 3300 is disposed between the multiple movable contact pieces 3110 and the base 3211, and is used to apply an elastic force to the multiple movable contact pieces 3110, causing them to move toward the top wall 3221, thereby providing contact pressure.

[0094] In other embodiments, the contact support 3220 may also have other structures, which are not listed here one by one. The push rod assembly 3200 may also have other structures, which are not described here in detail.

[0095] The plurality of movable contact pieces 3110 are arranged side by side along the third direction D3.

[0096] Continuing with Figures 3 and 4 , the yoke plate 1200 has a second through-hole 1210 extending through two oppositely-facing side surfaces of the yoke plate 1200 along its thickness (second direction D2). The second through-hole 1210 communicates with the contact chamber 1001 of the contact container 1000. A rod 3212 is movably disposed through the second through-hole 1210 along the second direction D2. A base 3211 at one axial end of the rod 3212 is disposed within the contact chamber 1001.

[0097] The sealing unit 40 further includes a metal cover 5000, which is connected to the side of the yoke plate 1200 facing away from the insulating cover 1100 and covers the second through hole 1210 in the yoke plate 1200. The metal cover 5000 and the yoke plate 1200 enclose a chamber for accommodating the static iron core 4300 and the movable iron core 4400 of the magnetic circuit portion 4000.

[0098] Referring back to FIG1 , the coil unit 20 includes a coil frame 21 and a coil 22 . The coil frame 21 is hollow and cylindrical and is made of insulating material. The metal cover 5000 is inserted into the coil frame 21 . The coil 22 surrounds the coil frame 21 .

[0099] As shown in Figures 3 and 4, the magnetic circuit portion 4000 includes a static iron core 4300, a movable iron core 4400, and a reset member 4500. The static iron core 4300 is fixedly disposed in the metal cover 5000, and a portion of the static iron core 4300 extends into the second through hole 1210. The static iron core 4300 has a through hole 4310, which is arranged corresponding to the position of the second through hole 1210 for the rod portion 3212 to pass therethrough. The movable iron core 4400 is movably disposed in the metal cover 5000 and is arranged opposite to the static iron core 4300 along the axial direction (second direction D2) of the rod portion 3212. The movable iron core 4400 is connected to the rod portion 3212 and is configured to be attracted by the static iron core 4300 when the coil 22 is energized. The movable iron core 4400 and the rod portion 3212 can be connected by screwing, riveting, welding, or other means.

[0100] The reset member 4500 is located inside the metal cover 5000 and is arranged between the static iron core 4300 and the movable iron core 4400. It is used to reset the movable iron core 4400 when the coil 22 is powered off. The reset member 4500 can be a spring and is sleeved on the outside of the rod 3212.

[0101] It should be noted that when coil 22 is energized, static iron core 4300 attracts movable iron core 4400 to move upward, and movable iron core 4400 drives rod assembly 3200 to move upward via rod 3212. When movable contact piece 3110 contacts static contact lead 2000, it is stopped by static contact lead 2000, while rod 3212 and base 3211 continue to move upward until the overtravel is completed.

[0102] During the overtravel process, the base 3211 squeezes the elastic component 3300 . After being squeezed, the elastic component 3300 can provide elastic force to the movable contact piece 3110 to provide contact pressure.

[0103] Please continue to refer to Figures 3 and 4. The relay 1 also includes a first magnetic conductor 610, which is used to form an attractive force on the moving contact piece 3110 in the direction of contact closure. This attractive force can resist the electromotive repulsive force generated by the short-circuit current between the moving contact piece 3110 and the static contact lead-out terminal 2000, thereby preventing the moving contact piece 3110 and the static contact lead-out terminal 2000 from bouncing apart.

[0104] In one embodiment, the first magnetic conductor 6100 is disposed on a side of the movable contact piece 3110 facing away from the elastic component 3300 . In other words, the first magnetic conductor 6100 is disposed on a side of the movable contact piece 3110 facing the static contact lead-out terminal 2000 .

[0105] It is understandable that when the movable contact piece 3110 is energized, the first magnetic conductor 6100 is magnetized, thereby forming an attractive force on the movable contact piece 3110 in the direction of contact closure, thereby achieving the purpose of anti-short circuit.

[0106] Furthermore, as described above, the movable contact assembly 3100 may further include a second magnetic conductor 6200. The second magnetic conductor 6200 is fixedly connected to the side of the movable contact piece 3110 that faces the elastic assembly 3300. In other words, the second magnetic conductor 6200 is fixedly connected to the side of the movable contact piece 3110 that faces away from the static contact lead-out terminal 2000. The second magnetic conductor 6200 is used to form a magnetic conductive circuit with the first magnetic conductor 6100.

[0107] The number of second magnetic conductors 6200 corresponds to the number of movable contact pieces 3110. In the embodiment of the present application, the number of second magnetic conductors 6200 is two, but the present invention is not limited thereto. The two second magnetic conductors 6200 are respectively fixedly connected to the side of the two movable contact pieces 3110 facing away from the static contact lead-out terminal 2000.

[0108] When the movable contact piece 3110 contacts the pair of stationary contact leads 2000 at both ends along the first direction D1, current flows through the movable contact piece 3110, forming a magnetic circuit surrounding the movable contact piece 3110 between the first magnetic conductor 6100 and the second magnetic conductor 6200. When a short-circuit current flows through the movable contact piece 3110, an attractive force is generated between the first magnetic conductor 6100 and the second magnetic conductor 6200 in the direction of contact pressure. This attractive force counteracts the electrodynamic repulsive force between the movable contact piece 3110 and the stationary contact leads 2000 caused by the short-circuit current, preventing the movable contact piece 3110 and the stationary contact leads 2000 from bouncing apart.

[0109] It is understood that the first magnetic conductor 6100 and the second magnetic conductor 6200 can be linear or U-shaped. The first magnetic conductor 6100 and the second magnetic conductor 6200 can be made of soft magnetic materials such as iron, cobalt, nickel, and alloys thereof.

[0110] As shown in Figures 3 and 4 , the first magnetic conductor 6100 is disposed within the contact chamber 1001 of the contact container 1000 and is fixed relative to the contact container 1000. This transfers the short-circuit-resistant suction force to the contact container 1000. Because the contact container 1000 is a stationary component, excessive coil retention force is not required, thereby reducing the power consumption of the relay 1's coil and the size of the relay 1, thereby improving the short-circuit resistance.

[0111] Furthermore, 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 has a third through hole 1111. The connector 6300 is rod-shaped and extends 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.

[0112] 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, bonding, etc. 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, clamping, etc.

[0113] It can be understood that when one end of the connector 6300 is connected to the ceramic cover 1110 by welding, by welding the connector 6300 to the top wall of the ceramic cover 1110, the metallization layer can be processed only on the periphery of the third through hole 1111 on the outer wall surface of the top wall, without the need to process the metallization layer on the inner wall surface of the top wall, which facilitates processing and simplifies the processing steps.

[0114] It is understandable that one end of the connector 6300 may be connected to the outer wall of the ceramic cover 1110 , or to the inner wall of the ceramic cover 1110 , or to both the outer and inner walls of the ceramic cover 1110 .

[0115] It can be seen from this that the first magnetic conductor 6100 is connected to the ceramic cover 1110 through the connector 6300. On the one hand, the anti-short-circuit suction force is transferred to the ceramic cover 1110, so there is no need for excessive coil holding force, thereby reducing the power consumption of the coil of the relay 1 and the volume 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, it will not occupy too much space in the contact chamber, thereby ensuring the arc extinguishing space of the arc extinguishing assembly and the activity space of the push rod.

[0116] In addition, the first magnetic conductor 6100 is connected to the rod-shaped connecting member 6300, so that a variety of connection methods can be used between the first magnetic conductor 6100 and the connecting member 6300, such as riveting, laser welding, clamping, gluing, etc., which enriches the connection methods.

[0117] As an example, the connector 6300 is a solid rod. Thus, the connector 6300 and the first magnetic conductor 6100 can be connected by riveting, making the connection more reliable. Furthermore, a solid rod provides greater support strength and is less prone to deformation.

[0118] Of course, the first magnetizer 6100 can also be fixed in the contact container 1000 by a fixing bracket (not shown). Specifically, the fixing bracket is disposed in the contact container 1000 and fixedly connected to the yoke plate 1200, and the first magnetizer 6100 is fixedly connected to the fixing bracket.

[0119] In addition, the first magnetic conductor 6100 may also be fixedly connected to the inner side of the top wall 3221 of the contact bracket 3220 to form a follow-up anti-short circuit structure.

[0120] In another embodiment, the distance between the first and second magnetizers 6100, 6200, can be designed to be variable. Specifically, the distance between the first and second magnetizers 6100, 6200 can be adjusted based on the current, thereby varying the magnetic attraction between the first and second magnetizers 6100, 6200. This ensures both short-circuit protection and overload disconnection.

[0121] Optionally, the first magnetic conductor 6100 may include multiple stacked magnetic conductive sheets. It will be appreciated that increasing the number of thinner magnetic conductive sheets can increase the overall thickness of the first magnetic conductor 6100. On the one hand, thinner magnetic conductive sheets can be made from thin strips, resulting in lower material costs and easier handling. On the other hand, the number of magnetic conductive sheets can be flexibly adjusted based on the magnitude of the short-circuit current.

[0122] It should be noted that the process of switching relay 1 from fully open to fully closed can be divided into two stages: the first stage is when the movable iron core 4400 drives the movable contact piece 3110 upward through the push rod assembly 3200 until the movable contact piece 3110 just contacts the static contact lead 2000. During the first stage, the suction force provided by the static iron core 4300 to the movable iron core 4400 slowly increases and must always be greater than the sum of the elastic force provided by the reset member 4500 and the weight of the push rod assembly 3200 and the movable iron core 4400. The second stage is when the movable contact piece 3110 contacts the static contact lead 2000. Instead, the movable iron core 4400 continues to move upward by driving the push rod assembly 3200 until the movable iron core 4400 contacts the static iron core 4300 (the second stage is the overtravel process). During the second stage, the elastic assembly 3300 is squeezed by the push rod assembly 3200 and is able to provide elastic force. Therefore, the suction force provided by the static iron core 4300 to the movable iron core 4400 needs to be greater than the sum of the elastic force provided by the reset member 4500, the push rod assembly 3200, the weight of the movable iron core 4400 itself, and the elastic force provided by the elastic assembly 3300.

[0123] For easier understanding, further explanation can be provided in conjunction with Figure 5. It should be noted that Figure 5 shows a graph of the relationship between the suction force and the reaction force and the magnetic gap. Curve 1 represents the relationship between the suction force and the magnetic gap, and Curve 2 represents the relationship between the reaction force and the magnetic gap of the conventional relay 1.

[0124] As shown in Figure 5, during the entire process of relay 1 switching from fully open to fully closed, the suction force increases exponentially as the magnetic gap between the static iron core 4300 and the movable iron core 4400 gradually decreases. The change in the reaction force can be divided into two stages. Before the movable contact piece 3110 contacts the static contact terminal 2000, the reaction force consists solely of the elastic force provided by the reset element 4500 and the weight of the push rod assembly 3200 and the movable iron core 4400. As the magnetic gap gradually decreases, once the movable contact piece 3110 contacts the static contact terminal 2000, the elastic force provided by the elastic assembly 3300 also contributes to the reaction force. As a result, curve 2, representing the reaction force, has a turning point where it increases sharply.

[0125] It can be further seen from FIG. 5 that no matter what the size of the magnetic gap is, the suction force must always be greater than the reaction force so that the suction force can overcome the reaction force to drive the push rod assembly 3200 upward, thereby achieving contact closure.

[0126] As described in the background technology, in order to ensure the reliability of the electrical connection between the moving contact and the static contact, it is necessary to increase the contact pressure, and then increase the suction force, and then increase the power consumption and volume of the coil, but this is inconsistent with the current development trend of low power consumption and small volume of coils.

[0127] Furthermore, as shown in Figure 5, Curve 3 shows the relationship between suction force and magnetic gap after coil power consumption is reduced. Comparing Curves 1 and 3, when the magnetic gap remains constant, the suction force corresponding to Curve 3 is less than that corresponding to Curve 1. At this point, if the contact pressure remains constant and the coil power consumption is directly reduced (lower coil power consumption reduces suction force), Curves 2 and 3 will intersect throughout the contact closure process. At this point, the suction force is less than the reaction force (i.e., the suction force and reaction force do not match), causing Relay 1 to fail to close.

[0128] It can be seen that in the prior art, high contact pressure and low coil power consumption cannot be achieved at the same time, which obviously affects the development of the relay 1.

[0129] Based on this, an embodiment of the present application provides a relay 1, in which the stiffness coefficient of the elastic component 3300 is variable, which reduces the power consumption of the coil without affecting the matching of the suction and reaction forces, and can also ensure a sufficiently large contact pressure.

[0130] In the relay 1 of the embodiment of the present application, during the overtravel process, the push rod assembly 3200 squeezes the elastic assembly 3300, and has an overtravel initial position, a transition position and an overtravel end position relative to the position of the moving contact piece 3110, that is, in the process of switching the push rod assembly 3200 from fully open to fully closed, it first passes through the overtravel initial position, then passes through the transition position, and finally reaches the overtravel end position.

[0131] As shown in Figure 7, the elastic component 3300 has a first fulcrum O1 and a second fulcrum O2. When the elastic component 3300 is squeezed by the push rod component 3200 and deformed with the first fulcrum O1 as the rotation point, it has a first lever arm. When the elastic component 3300 is squeezed by the push rod component 3200 and deformed with the second fulcrum O2 as the rotation point, it has a second lever arm. The length of the first lever arm is not equal to the length of the second lever arm.

[0132] In the relay of the embodiment of the present application, the elastic component 3300 has a first fulcrum O1 and a second fulcrum O2. By adding the second fulcrum O2, during the overtravel process, the elastic component 3300 can be deformed with the first fulcrum O1 and the second fulcrum O2 as the rotation points, thereby making the stiffness coefficient of the elastic component 3300 variable to take into account low coil power consumption and large contact pressure.

[0133] Before the push rod assembly 3200 moves from the overtravel initial position to the transition position, the elastic assembly 3300 is deformed with the second fulcrum O2 as the rotation point; during the process of the push rod assembly 3200 moving from the transition position to the overtravel end position, the elastic assembly 3300 is deformed with the first fulcrum O1 as the rotation point.

[0134] As shown in Figures 6 and 7, the elastic assembly 3300 of the embodiment of the present application includes a first leaf spring 100 and a second leaf spring 200 stacked together. The first leaf spring 100 and the second leaf spring 200 are connected to 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 abut 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 abut the push rod assembly 3200; and in yet another embodiment, the first leaf spring 100 and the second leaf spring 200 are connected to the push rod assembly 3200 and the movable contact assembly 3100. The following description will take the example of the first leaf spring 100 and the second leaf spring 200 being connected to the push rod assembly 3200 and abutting the movable contact assembly 3100.

[0135] When the push rod assembly 3200 moves from the overtravel initial position to the overtravel end position, both ends of the second leaf spring 200 along the length direction (first direction D1 ) of the movable contact piece 3110 contact the first leaf spring 100 .

[0136] The spring constant of the first leaf spring 100 is less than or equal to the spring constant of the second leaf spring 200 . Furthermore, the thickness of the first leaf spring 100 is less than or equal to the thickness of the second leaf spring 200 .

[0137] It should be noted that the over-travel initial position refers to the position of the push rod assembly 3200 relative to the moving contact piece 3110 when the push rod assembly 3200 drives the moving contact piece 3110 to just contact the static contact lead-out end 2000; the over-travel end position refers to the position of the push rod assembly 3200 relative to the moving contact piece 3110 after the moving iron core 4400 contacts the static iron core 4300 (that is, the magnetic gap is equal to zero).

[0138] The connection point between the first leaf spring 100, the second leaf spring 200, and the push rod assembly 3200 forms a first fulcrum O1, and the contact point between the first leaf spring 100 and the second leaf spring 200 forms a second fulcrum O2. The first moment arm of the elastic assembly 3300 when deformed about the first fulcrum O1 is not equal to the second moment arm of the elastic assembly 3300 when deformed about the second fulcrum O2.

[0139] As shown in Figures 7 to 9, before the push rod assembly 3200 moves from the over-travel initial position to the transition position, part of the first leaf spring 100 is deformed with the second fulcrum O2 as the rotation point; during the process of the push rod assembly 3200 moving from the transition position to the over-travel end position, the first leaf spring 100 and the second leaf spring 200 are deformed at the same time with the first fulcrum O1 as the rotation point.

[0140] In an embodiment of the present application, before the push rod assembly 3200 moves from the overtravel initial position to the transition position relative to the dynamic contact piece 3110, the first leaf spring 100 of the elastic component 3300 is deformed and has a first stiffness coefficient. During the process of the push rod assembly 3200 moving from the transition position to the overtravel end position relative to the dynamic contact piece 3110, the first leaf spring 100 and the second leaf spring 200 of the elastic component 3300 are deformed at the same time and have a second stiffness coefficient. Therefore, the stiffness coefficient of the elastic component 3300 is variable, and the first stiffness coefficient is smaller than the second stiffness coefficient, so that in the process of the push rod assembly 3200 squeezing the elastic component 3300 in the overtravel, the relationship curve between the reaction force and the magnetic gap is a broken line (such as curve 4 in Figure 5).

[0141] 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 static contact lead end 2000) overlaps with the first half of curve 2. Therefore, in the following description of curve 4, only the differences between curve 4 and curve 2 are introduced, and the part overlapping with curve 2 is no longer repeated.

[0142] As shown in FIG5 , in the prior art, when the push rod assembly 3200 is at the initial overtravel position, it corresponds to point A of curve 2 ; when the push rod assembly 3200 is at the end overtravel position, it corresponds to point B of curve 2 .

[0143] In an embodiment of the present application, when the push rod assembly 3200 is at the initial position of the overtravel, it corresponds to point A' of curve 4 (A' coincides with A); when the push rod assembly 3200 is at the end position of the overtravel, it corresponds to point B' of curve 4, wherein the reaction force corresponding to point B' is greater than the reaction force corresponding to point B; when the push rod assembly 3200 is at the transition position, it corresponds to point C of curve 4.

[0144] Thus, the curve of the relationship between the reaction force and the magnetic gap in the prior art is a straight line segment AB, while the curve of the relationship between the reaction force and the magnetic gap in the embodiment of the present application is a broken line segment A'CB'. The slope of the A'C segment is smaller than the slope of the AB segment, and the slope of the AB segment is smaller than the slope of the CB' segment.

[0145] In the embodiment of the present application, since the slope of the A'C segment is smaller than the slope of the AB segment, and the slope of the CB' segment is larger than the slope of the AB segment, curve 3 does not intersect with A'CB', but curve 3 is always located above curve 4. Therefore, during the entire process of contact closure, the suction force will not be smaller than the reaction force (i.e., the suction force and the reaction force do not match).

[0146] It can be seen that in the relay 1 of the embodiment of the present application, the elastic component 3300 includes a first leaf spring 100 and a second leaf spring 200. When the elastic component 3300 is squeezed by the push rod assembly 3200, part of the first leaf spring 100 will be deformed before the second leaf spring 200, so that during the movement of the push rod assembly 3200 from the over-travel initial position to the transition position, the elastic component 3300 has a first stiffness coefficient; as the push rod assembly 3200 continues to squeeze the elastic component 3300, during the movement of the push rod assembly 3200 from the transition position to the over-travel contact position, both the first leaf spring 100 and the second leaf spring 200 are deformed, so that the elastic component 3300 has a second stiffness coefficient. During the movement of push rod assembly 3200 from the initial overtravel position to the transition position, the first spring constant of elastic assembly 3300 is relatively low. During the movement of push rod assembly 3200 from the transition position to the end overtravel position, the second spring constant of elastic assembly 3300 is relatively high. This results in a curve representing the relationship between the reaction force and the magnetic gap from the initial overtravel position to the end overtravel position that is a broken line segment. This ensures that even when the coil power consumption is reduced, the suction force will not be less than the reaction force, thus ensuring reliable closure of relay 1. Furthermore, because the spring constant of elastic assembly 3300 is relatively high during the transition position to the end overtravel position, the reaction force is also relatively high when push rod assembly 3200 moves relative to movable contact piece 3110 to the end overtravel position, thereby increasing contact pressure. While ensuring sufficient contact pressure, coil power consumption can be reduced.

[0147] Furthermore, referring to Figure 5, if the coil power consumption remains unchanged, that is, the relationship curve between the suction force and the magnetic gap remains Curve 1, then, provided that the suction force is greater than the reaction force, Curve 4 can be shifted upward, thereby increasing the reaction force. Therefore, the relay 1 of the present embodiment can increase the reaction force, thereby increasing the contact pressure, while maintaining the coil power consumption unchanged.

[0148] As shown in Figures 6, 7 and 10, the first leaf spring 100 includes a first base plate 110 and a first extension arm 120. At least one 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 connected to the first base plate 110 and bent relative to the first base plate 110.

[0149] As shown in FIG6 , the first extension arm 120 may include a first section 121 and a second section 122. The first section 121 is connected to the first substrate 110 and bent relative to the first substrate 110. The second section 122 is connected to an end of the first section 121 away from the first substrate 110. The first section 121 and the second section 122 are arranged at an angle.

[0150] The second leaf spring 200 includes a second base plate 210 and a second extension arm 220. The second base plate 210 overlaps the first base plate 110, and the connection between the second base plate 210, the first base plate 110, and the push rod assembly 3200 forms a first fulcrum O1. At least one second extension arm 220 is provided at each end of the second base plate 210 along the length direction (first direction D1) of the movable contact piece 3110. The second extension arm 220 is connected to the second base plate 210 and bends relative to the second base plate 210. The end of the second extension arm 220 away from the second base plate 210 contacts the first extension arm 120 of the first leaf spring 100, and the contact position forms a second fulcrum O2.

[0151] The at least two first extension arms 120 at either end of the first substrate 110 correspond to the at least two second extension arms 220 at either end of the second substrate 210, and the contact points between the corresponding first extension arms 120 and second extension arms 220 form a second fulcrum O2. As the push rod assembly 3200 moves from the overtravel initial position to the transition position, the portion of the first extension arm 120 of the first leaf spring 100 that extends beyond the second fulcrum O2 along the length direction (first direction D1) of the movable contact piece 3110 deforms, with the second fulcrum O2 serving as the pivot point.

[0152] The first substrate 110 and the second substrate 210 are connected to one of the movable contact component 3100 and the push rod component 3200, the first extension arm 120 bends from the first substrate 110 toward the other one of the movable contact component 3100 and the push rod component 3200 that is not connected to the first substrate 110, and the second extension arm 220 bends from the second substrate 210 toward the other one of the movable contact component 3100 and the push rod component 3200 that is not connected to the second substrate 210.

[0153] As shown in FIG7 , in the embodiment of the present application, the first leaf spring 100 and the second leaf spring 200 are positioned between the movable contact assembly 3100 and the push rod assembly 3200. The first base 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 piece 3110 of the movable contact assembly 3100. The second leaf spring 200 is positioned on the side of the first leaf spring 100 facing away from the movable contact assembly 3100, and the second base 210 of the second leaf spring 200 is connected to the base 3211 of the push rod assembly 3200.

[0154] As shown in FIG6 , a plurality of first extending arms 120 are provided at both ends of the first substrate 110 along the first direction D1. The plurality of first extending arms 120 at each end of the first substrate 110 are arranged along a third direction D3. A plurality of second extending arms 220 are provided at both ends of the second substrate 210 along the first direction D1. The plurality of second extending arms 220 at each end of the second substrate 210 are arranged along the third direction D3.

[0155] The plurality of first extending arms 120 at one end of the first substrate 110 along the first direction D1 corresponds to the plurality of second extending arms 220 at one end of the second substrate 210 along the first direction D1.

[0156] In the embodiment of the present application, two first extension arms 120 are respectively provided at both ends of the first substrate 110 along the first direction D1. The two first extension arms 120 at each end of the first substrate 110 are spaced apart along the third direction D3. Two second extension arms 220 are respectively provided at both ends of the second substrate 210 along the first direction D1. The two second extension arms 220 at each end of the second substrate 210 are spaced apart along the third direction D3. The four first extension arms 120 of the first leaf spring 100 correspond to the four second extension arms 220 of the second leaf spring 200.

[0157] Of course, in other embodiments, the number of first extension arms 120 of the first leaf spring 100 and the number of second extension arms 220 of the second leaf spring 200 may not correspond. For example, the first base plate 110 may have two first extension arms 120 at each end along the first direction D1, and the second base plate 210 may have one second extension arm 220 at each end along the first direction D1. The second extension arms 220 are relatively wide and are sufficient to support the two corresponding first extension arms 120.

[0158] The first substrate 110 and the second substrate 210 are regarded as bases, and the first extension arm 120 and the second extension arm 220 are regarded as extensions.

[0159] As shown in FIG7 , the geometric centers of the first leaf spring 100 and the second leaf spring 200 are both located on the centerline 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 about the centerline 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.

[0160] It can be understood that the position where the second leaf spring 200 contacts the first leaf spring 100 forms the second fulcrum O2. The position of the second fulcrum O2 can be adjusted by adjusting the contact position, thereby adjusting the length of the lever arm, which provides greater design freedom and better applicability.

[0161] 7 to 9 and FIG5 illustrate the deformation process of the first leaf spring 100 and the second leaf spring 200 during the overtravel process.

[0162] Figure 7 shows the elastic assembly 3300 in its initial state. It should be noted that the initial state refers to the state of the elastic assembly 3300 when the movable contact piece 3110 is not in contact with the static contact lead 2000, or when the movable contact piece 3110 has just made contact with the static contact lead 2000. In the initial state, the elastic assembly 3300 has an initial deformation and can provide an initial elastic force to the movable contact assembly 3100. The initial elastic force provided by the elastic assembly 3300 is provided by the initial deformation of the first leaf spring 100.

[0163] As shown in FIG8 , when the push rod assembly 3200 moves from the overtravel initial position to the transition position, the portion of the first leaf spring 100 extending beyond the second leaf spring 200 is deformed with the second fulcrum O2 as the rotation point. At this time, the elastic assembly 3300 has a first spring coefficient.

[0164] It is understood that the state shown in FIG8 can be considered that the push rod assembly 3200 is in the transition position, or it can be considered that the push rod assembly 3200 is in an intermediate position between the overtravel initial position and the transition position. When the push rod assembly 3200 is in the transition position, the deformation state of the elastic assembly 3300 corresponds to point C in curve 4 in FIG5.

[0165] As shown in Figure 9, as the push rod assembly 3200 moves from the transition position to the overtravel end position, both the first leaf spring 100 and the second leaf spring 200 deform with the first fulcrum O1 as the pivot point. At this point, the elastic assembly 3300 exhibits the second spring constant. As the push rod assembly 3200 moves from the transition position to the overtravel end position, it can be assumed that the first leaf spring 100 experiences a greater deformation, and the second leaf spring 200 begins to deform.

[0166] It should be noted that during the movement of the push rod assembly 3200 from the transition position to the overtravel end position, the portion of the first leaf spring 100 that extends beyond the second leaf spring 200 may or may not deform with the second fulcrum O2 as the pivot point. When the stiffness of the second leaf spring 200 is sufficiently high, the portion of the first leaf spring 100 that extends beyond the second leaf spring 200 can deform with the second fulcrum O2 as the pivot point.

[0167] As shown in FIG11 , the similarities between the movable assembly 3000 of the second embodiment and the movable assembly 3000 of the first embodiment are not repeated here, and the differences are as follows:

[0168] There is one movable contact assembly 3100, and the movable contact assembly 3100 includes a movable contact piece 3110 and a second magnetic conductor 6200. The first leaf spring 100 includes a first base 110 and two first extension arms 120, with each first extension arm 120 being provided at both ends of the first base 110 along the first direction D1. The second leaf spring 200 includes a second base 210 and two second extension arms 220, with each second extension arm 220 being provided at both ends of the second base 210 along the first direction D1.

[0169] As shown in FIG12 , the similarities between the movable assembly 3000 of the third embodiment and the movable assembly 3000 of the first embodiment are not repeated here, and the differences are as follows:

[0170] There are three movable contact assemblies 3100, each comprising a movable contact piece 3110 and a second magnetic conductor 6200. The first leaf spring 100 comprises a first base 110 and six first extension arms 120. Three first extension arms 120 are provided at each end of the first base 110 along the first direction D1. The three second extension arms 130 at one end of the first base 110 along the first direction D1 correspond to the three movable contact assemblies 3100, respectively. The second leaf spring 200 comprises a second base 210 and six second extension arms 220. Three second extension arms 220 are provided at each end of the second base 210 along the first direction D1. The three second extension arms 220 at one end of the second base 210 along the first direction D1 are supported by the corresponding three first extension arms 120.

[0171] As shown in FIG13 , the similarities between the movable assembly 3000 of the fourth embodiment and the movable assembly 3000 of the first embodiment are not repeated here, and the differences are as follows:

[0172] The shapes of the first and second leaf springs 100 and 200 of the fourth embodiment differ from those of the first embodiment. In this embodiment, the ends of the first leaf spring 100 along the first direction D1 converge toward the center. The bending amplitude of the second leaf spring 200 of the fourth embodiment is slightly smaller than that of the first embodiment.

[0173] It should be noted that the present application does not impose any particular limitation on the shapes of the first leaf spring 100 and the second leaf spring 200 .

[0174] In addition, the two ends of the first leaf spring 100 are connected to the movable contact piece 3110 via an anti-rotation structure that is used to limit the relative rotation between the first leaf spring 100 and the movable contact piece 3110 around the center line of the push rod assembly 3200.

[0175] In one embodiment, the anti-rotation structure can be a combination of a limiting hole and a limiting protrusion; in another embodiment, the anti-rotation structure can also be a riveted structure, and the end of the first leaf spring 100 is riveted to the moving contact piece 3110; in another embodiment, the anti-rotation structure can also be a welded structure, and the end of the first leaf spring 100 is welded to the moving contact piece 3110.

[0176] As shown in FIG. 14 to FIG. 18 , the similarities between the moving assembly 3000 of the fifth embodiment and the moving assembly 3000 of the first embodiment are not repeated here, and the differences are as follows:

[0177] The elastic assembly 3300 includes a third leaf spring 300, which is connected to the movable spring 3110 and the push rod assembly 3200. The third leaf spring 300 includes a third base plate 310 and a third extension arm 320. The third base plate 310 is connected to the base 3211 of the push rod assembly 3200, with the connection forming a first fulcrum O1. At least one third extension arm 320 is provided at each end of the third base plate 310 along the first direction D1. During deformation, the third extension arm 320 contacts the corresponding push rod assembly 3200, with the contact position forming a second fulcrum O2. Each third extension arm 320 is connected to the third base plate 310 at one end and to the movable spring 3110 at the other end. Among them, before the pushing rod assembly 3200 moves to the transition position, the third extension arm 320 does not contact the pushing rod assembly 3200, and at this time the third leaf spring 300 is deformed with the first fulcrum O1 as the rotation point; in the process of the pushing rod assembly 3200 moving from the transition position to the over-travel end position, the third extension arm 320 abuts against the base 3211 of the pushing rod assembly 3200, and at this time the third leaf spring 300 is deformed with the second fulcrum O2 as the rotation point.

[0178] It can be understood that when the third extension arm 320 is not in contact with the push rod assembly 3200, the force arm of the third extension arm 320 is longer, and at this time the stiffness coefficient of the third leaf spring 300 is smaller; when the third extension arm 320 is in contact with the push rod assembly 3200, the force arm of the third extension arm 320 becomes smaller, and at this time the stiffness coefficient of the third leaf spring 300 becomes larger.

[0179] The third substrate 310 is regarded as a base, and the third extension arm 320 is regarded as an extension.

[0180] As shown in FIG. 14 to FIG. 18 , in one embodiment, each third extension arm 320 has a protrusion 330 protruding away from the movable spring 3110 , and the position where the protrusion 330 contacts the base 3211 of the push rod assembly 3200 forms a second fulcrum O2 .

[0181] In the embodiment of the present application, by providing a third leaf spring 300 having a protrusion 330, the purpose of variable stiffness coefficient of the elastic component 3300 can be achieved, which not only takes into account high contact pressure and low coil power consumption, but also saves parts and improves the assemblability of the elastic component.

[0182] In one embodiment, the protrusion 330 is formed by bending the third extension arm 320 , but the present invention is not limited thereto.

[0183] Before the push rod assembly 3200 moves to the transition position, the protrusion 330 does not contact the push rod assembly 3200; when the push rod assembly 3200 moves from the transition position to the overtravel end position, the protrusion 330 abuts against the push rod assembly 3200.

[0184] It can be understood that when the protrusion 330 does not contact the push rod assembly 3200, the force arm of the third extension arm 320 is longer, and the stiffness coefficient of the third leaf spring 300 is smaller; when the protrusion 330 abuts against the push rod assembly 3200, the force arm of the third extension arm 320 becomes smaller, and the stiffness coefficient of the third leaf spring 300 becomes larger.

[0185] Of course, in another embodiment, the spring constant of the third extension arm 320 can be changed by: each third extension arm 320 is provided with a protrusion on the side of the base 3211 facing the third leaf spring 300, rather than the protrusion 330. Before the push rod assembly 3200 moves to the transition position, the protrusion is not in contact with the third leaf spring 300. At this time, the moment arm of the third leaf spring 300 is long, and the spring constant of the third leaf spring 300 is low. As the push rod assembly 3200 moves from the transition position to the overtravel end position, the protrusion contacts the third leaf spring 300. At this time, the moment arm of the third leaf spring 300 decreases, and the spring constant of the third leaf spring 300 increases. The contact point between the protrusion and the third leaf spring 300 forms a second fulcrum O2.

[0186] In summary, the relay of the embodiment of the present application has at least the following advantages and beneficial effects:

[0187] In the relay of the embodiment of the present application, during the movement of the push rod assembly 3200 from the initial overtravel position to the transition position, the first spring coefficient of the elastic assembly 3300 is relatively low. During the movement of the push rod assembly 3200 from the transition position to the end overtravel position, the second spring coefficient of the elastic assembly 3300 is relatively high. This results in a curve showing the relationship between the reaction force and the magnetic gap from the initial overtravel position to the end overtravel position, forming a broken line segment. This ensures that even when the power consumption of the coil is reduced, the suction force will not be less than the reaction force, thereby ensuring reliable closure of the relay 1. Furthermore, because the spring coefficient of the elastic assembly 3300 is relatively high during the transition position to the end overtravel position, the reaction force is also relatively high when the push rod assembly 3200 moves relative to the movable contact piece 3110 to the end overtravel position, thereby increasing the contact pressure. While ensuring sufficient contact pressure, the power consumption of the coil can be reduced.

[0188] Furthermore, referring to Figure 5, if the coil power consumption remains unchanged, that is, the relationship curve between the suction force and the magnetic gap remains Curve 1, then, provided that the suction force is greater than the reaction force, Curve 4 can be shifted upward, thereby increasing the reaction force. Therefore, the relay 1 of the present embodiment can increase the reaction force, thereby increasing the contact pressure, while maintaining the coil power consumption unchanged.

[0189] Furthermore, the elastic assembly 3300 includes a first leaf spring 100 and a second leaf spring 200. Before moving from the initial overtravel position to the transition position, the first leaf spring 100 deforms. During the transition to the end overtravel position, both the first and second leaf springs 100 and 200 deform simultaneously. This results in a variable spring constant for the elastic assembly 3300, resulting in a curve representing the relationship between the reaction force and the magnetic gap throughout the overtravel process, balancing high contact pressure with low coil power consumption. Furthermore, the two leaf springs enhance the elastic assembly's overall resistance to mechanical fatigue.

[0190] 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 length of the lever arm. This provides greater design freedom and greater applicability.

[0191] Furthermore, by providing a third leaf spring 300 having a protrusion 330, the purpose of variable stiffness coefficient of the elastic component 3300 can be achieved, which not only takes into account high contact pressure and low coil power consumption, but also saves parts and improves the assemblability of the elastic component.

[0192] It is understandable that the various embodiments / implementations provided in this application can be combined with each other without causing any contradiction, and they will not be illustrated one by one here.

[0193] In the application embodiments, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or abutment between two parts; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to the specific circumstances.

[0194] In the description of the application embodiments, it should be understood that the terms "up", "down", "left", "right", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the application embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the application embodiments.

[0195] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the claimed invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0196] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A relay, characterized in that: include: Push rod assembly; A movable contact assembly, including a movable contact piece; An elastic component is connected to the push rod assembly and the movable contact assembly, and is used to provide contact pressure to the movable contact piece; the elastic component has a first fulcrum and a second fulcrum, and when the elastic component is squeezed by the push rod assembly and deformed with the first fulcrum as the rotation point, it has a first lever arm, and when the elastic component is squeezed by the push rod assembly and deformed with the second fulcrum as the rotation point, it has a second lever arm, and the length of the first lever arm is not equal to the length of the second lever arm.

2. The relay according to claim 1, wherein: During the overtravel process, the push rod assembly squeezes the elastic assembly, and has an overtravel initial position, a transition position and an overtravel end position relative to the position of the moving contact piece in sequence; before the push rod assembly moves from the overtravel initial position to the transition position, the elastic assembly is deformed with one of the first fulcrum and the second fulcrum as the rotation point; during the process of the push rod assembly moving from the transition position to the overtravel end position, the elastic assembly is deformed with the other of the first fulcrum and the second fulcrum as the rotation point.

3. The relay according to claim 2, characterized in that The elastic assembly includes a first leaf spring and a second leaf spring stacked together, wherein the first leaf spring and the second leaf spring are both connected to one of the push rod assembly and the movable contact assembly, and the connection position forms the first fulcrum, and the contact position of the first leaf spring and the second leaf spring forms the second fulcrum; Among them, before the push rod assembly moves from the over-travel initial position to the transition position, part of the first leaf spring is deformed with the second fulcrum as the rotation point; during the process of the push rod assembly moving from the transition position to the over-travel end position, both the first leaf spring and the second leaf spring are deformed with the first fulcrum as the rotation point.

4. The relay according to claim 3, characterized in that The second leaf spring includes a second base plate; At least one second extension arm is respectively provided at both ends of the second substrate along the length direction of the movable contact piece. The second extension arm is connected to the second substrate and bent relative to the second substrate. An end of the second extension arm away from the second substrate contacts the first leaf spring, and the contact position forms the second fulcrum. Wherein, during the movement of the push rod assembly from the overtravel initial position to the transition position, the portion of the first leaf spring that exceeds the second fulcrum along the length direction of the movable contact piece is deformed with the second fulcrum as the rotation point.

5. The relay according to claim 4, characterized in that The first leaf spring includes a first base plate; The first substrate and the second substrate are stacked, and the first substrate and the second substrate are both connected to one of the push rod assembly and the movable contact assembly, and the connection position forms the first fulcrum; At least one first extension arm is respectively provided at both ends of the first substrate along the length direction of the movable contact piece, and the first extension arm is connected to the first substrate and bent relative to the first substrate; Among them, at least two first extension arms at both ends of the first substrate respectively correspond to the positions of at least two second extension arms at both ends of the second substrate, and the first extension arms contact the corresponding second extension arms during deformation, and the contact position forms the second fulcrum.

6. The relay according to claim 5, characterized in that The first extension arm is bent from the first substrate toward the other of the movable contact component and the push rod component that is not connected to the first substrate.

7. The relay according to claim 5, characterized in that The relay further includes a pair of static contact terminals, and the two ends of the movable contact piece along a first direction are used to respectively contact or separate with the pair of static contact terminals; the first direction is the arrangement direction of the pair of static contact terminals; the length direction of the movable contact piece is parallel to the first direction; A plurality of first extension arms are respectively provided at both ends of the first substrate along the first direction, and the plurality of first extension arms at each end of the first substrate are arranged along a third direction and correspond to a plurality of movable contact components arranged along the third direction; wherein the movement direction of the movable contact piece is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

8. The relay according to claim 4, wherein: The second extension arm is bent from the second substrate toward the other of the movable contact component and the push rod component that is not connected to the second substrate.

9. The relay according to claim 4, characterized in that The relay further includes a pair of static contact terminals, and the two ends of the movable contact piece along a first direction are used to respectively contact or separate with the pair of static contact terminals; the first direction is the arrangement direction of the pair of static contact terminals; the length direction of the movable contact piece is parallel to the first direction; The second substrate is respectively provided with a plurality of second extension arms at both ends along the first direction, and the plurality of second extension arms at each end of the second substrate are arranged along a third direction; wherein the movement direction of the movable contact piece is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

10. The relay according to claim 4, characterized in that The geometric centers of the first leaf spring and the second leaf spring are both located on the center line of the push rod assembly, and the second extension arms located at both ends of the second base plate along the length direction of the movable contact piece are symmetrically arranged about the center line of the push rod assembly.

11. The relay according to claim 3, characterized in that The spring constant of the first leaf spring is less than or equal to the spring constant of the second leaf spring.

12. The relay according to claim 11, wherein: The thickness of the first leaf spring is less than or equal to the thickness of the second leaf spring.

13. The relay according to claim 2, wherein: The elastic component includes a third leaf spring, the third leaf spring includes a third base plate, the third base plate is connected to the push rod component, and the connection position forms the first fulcrum; At least one third extension arm is respectively provided at both ends of the third base plate along the length direction of the movable contact piece, and the third extension arm contacts the corresponding push rod assembly during deformation, and the contact position forms the second fulcrum; Wherein, before the push rod assembly moves from the over-travel initial position to the transition position, the third leaf spring is deformed with the first fulcrum as the rotation point; during the process of the push rod assembly moving from the transition position to the over-travel end position, the third leaf spring is deformed with the second fulcrum as the rotation point.

14. The relay according to claim 13, characterized in that Each of the third extending arms has a protruding portion that protrudes away from the movable contact piece, and the contact position between the protruding portion and the push rod assembly forms the second fulcrum.

15. The relay according to claim 14, characterized in that The protrusion is formed by bending the third extension arm.

16. The relay according to any one of claims 1 to 15, characterized in that: The relay further comprises: a pair of static contact lead-out terminals, wherein the two ends of the movable contact piece along the first direction are used to respectively contact or separate with the pair of static contact lead-out terminals; the first direction is the arrangement direction of the pair of static contact lead-out terminals; A first magnetic conductor is provided on a side of the movable contact piece facing the static contact lead-out end.

17. The relay according to claim 16, characterized in that The movable contact assembly further includes a second magnetic conductor, which is fixedly connected to a side of the movable contact piece facing away from the static contact lead-out end, and is used to form a magnetic circuit with the first magnetic conductor.

18. The relay according to claim 1, wherein: The elastic component is a leaf spring component.

19. The relay according to claim 1, wherein: The elastic component includes a base and an extension, the base is connected to one of the push rod component and the movable contact component, and the connection position forms the first fulcrum, one end of the extension is connected to the base, and the other end of the extension is connected to the other of the push rod component and the movable contact component that is not connected to the base, and the extension has the second fulcrum.

20. The relay according to claim 19, wherein The extensions are provided on two opposite sides of the base.

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