Relay

Abstract

The utility model discloses a relay which comprises a static contact assembly, a movable contact assembly, a push rod assembly and an elastic piece. The movable contact assembly comprises a movable contact piece, and the movable contact piece is used for being connected or disconnected with the static contact assembly. The push rod assembly is used for driving the movable contact assembly to move. The elastic member is configured to provide a contact pressure to the movable contact assembly under the extrusion of the push rod assembly. The elastic piece is provided with a limiting structure, and the limiting structure is located on the side face of the moving direction of the movable contact assembly and used for limiting the movable contact assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric control devices, in particular to a relay. BACKGROUND

[0002] A relay is an electronic control device, which has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is usually applied in an automatic control circuit. The relay is actually a kind of "automatic switch" that uses a small current to control a large current. Therefore, it plays a role of automatic adjustment, safety protection, and conversion of circuits in the circuit.

[0003] A high-voltage direct-current relay is a kind of relay. The relay includes a static contact assembly, a movable contact assembly, and a push rod assembly. The movable contact assembly is arranged on the push rod assembly, and the push rod assembly can drive the movable contact assembly to move, so that the movable contact assembly contacts or separates from the static contact assembly. When the movable contact assembly contacts the static contact assembly, the relay is in a closed state; when the movable contact assembly separates from the static contact assembly, the relay is in an open state. When the relay switches from the open state to the closed state or from the closed state to the open state, the movable contact assembly is prone to swing, which leads to unreliable contact between the movable and static contacts of the relay and increases the failure rate of the relay. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a relay to improve the problem that the movable contact assembly is prone to swing.

[0005] The relay of the present application includes:

[0006] a static contact assembly;

[0007] a movable contact assembly including a movable contact piece, which is used to make contact or break contact with the static contact assembly;

[0008] a push rod assembly for driving the movable contact assembly to move; and

[0009] an elastic member configured to provide contact pressure to the movable contact piece by being pressed by the push rod assembly; the elastic member has a limiting structure on the side of the movement direction of the movable contact assembly, which is used to limit the movable contact assembly.

[0010] According to some embodiments of the present application, the limiting structure includes at least two limiting parts, and at least one limiting part is arranged on each side of the movable contact assembly along a first direction, which is the length direction of the movable contact piece.

[0011] According to some embodiments of this application, when the movable contact piece is disconnected from the static contact assembly, at least two of the limiting portions of the elastic member clamp the movable contact assembly.

[0012] According to some embodiments of this application, during the overtravel phase, there is a gap between the limiting portion and the movable contact component.

[0013] According to some embodiments of this application, the overtravel stage includes a first overtravel stage and a second overtravel stage; wherein, the first overtravel stage refers to the process in which, during the switching of the relay from a fully open state to a fully closed state, after the moving contact piece has just made contact with the stationary contact component, the push rod assembly continues to move until the relay is in a fully closed state; the second overtravel stage refers to the process in which, when the relay switches from a fully closed state to the point where the moving contact piece has just separated from the stationary contact component, the push rod assembly moves;

[0014] During the first overtravel phase, the elastic element is deformed by the push rod assembly, and the limiting portions located on both sides of the movable contact assembly along the first direction move in a direction away from each other.

[0015] During the second overtravel phase, the limiting portions located on both sides of the movable contact assembly along the first direction move toward each other until the limiting portions clamp the movable contact assembly.

[0016] According to some embodiments of this application, the limiting part has a first positioning structure, the movable contact component has a second positioning structure, and the first positioning structure and the second positioning structure are positioned and cooperated.

[0017] According to some embodiments of this application, one of the first positioning structure and the second positioning structure is a protrusion and the other is a groove, wherein the protrusion is used to insert into the groove.

[0018] According to some embodiments of this application, when the moving contact piece is disconnected from the stationary contact assembly, at least a portion of the protrusion is located within the groove.

[0019] According to some embodiments of this application, during overtravel, the protrusion is located outside the groove.

[0020] According to some embodiments of this application, the groove wall has a guide surface configured to guide the protrusion into the groove.

[0021] According to some embodiments of this application, the elastic element is a leaf spring and includes a base and two spring arms. The base is connected to the push rod assembly, and the two spring arms are respectively bent and connected to both ends of the base along the first direction, and the two spring arms respectively abut against the two ends of the movable contact assembly along the first direction.

[0022] The limiting portion is located at the end of the spring arm away from the base.

[0023] According to some embodiments of this application, the spring arm further includes:

[0024] A deformable portion, one end of which is connected to the base; wherein, when the push rod assembly compresses the elastic member, the deformable portion deforms to provide contact pressure;

[0025] The supporting part abuts against the movable contact component, one end of the supporting part is connected to the other end of the deformable part, and the other end of the supporting part is connected to the limiting part.

[0026] According to some embodiments of this application, the supporting portion abuts against the side surface of the moving contact piece facing away from the stationary contact assembly;

[0027] The distance from the end of the limiting part away from the supporting part to the supporting part is L1, the thickness of the moving contact piece is L2, L1 / L2 is R, and 1 / 2≤R≤1.

[0028] According to some embodiments of this application, the support portion has a protrusion that abuts against the movable contact assembly.

[0029] According to some embodiments of this application, the limiting portion includes:

[0030] A vertical section, one end of which is connected to the end of the spring arm away from the base;

[0031] An inclined segment is connected to the other end of the vertical segment and extends from the vertical segment in a direction away from the movable contact component and towards the stationary contact component.

[0032] According to some embodiments of this application, the elastic element is connected to the push rod assembly and abuts against the movable contact piece, and the movable contact piece is provided with the limiting structure on each side along a first direction, the first direction being the length direction of the movable contact piece.

[0033] According to some embodiments of this application, the number of movable contact components is equal to the number of elastic elements, and there are multiple elastic elements; each of the multiple elastic elements is connected to the push rod assembly, and the multiple elastic elements abut against the multiple movable contact components in the moving direction of the push rod assembly, for providing contact pressure to their respective movable contact components.

[0034] According to some embodiments of this application, the elastic element is a leaf spring and includes a base and two spring arms. The base is connected to the push rod assembly, and the two spring arms are respectively bent and connected to the two ends of the base along a first direction. The two spring arms respectively abut against the two ends of the movable contact assembly along the first direction. The bases of the plurality of elastic elements are integrally connected. The first direction is the length direction of the movable contact piece.

[0035] According to some embodiments of this application, the static contact assembly includes at least one pair of static contacts, and the moving contact is used to connect or disconnect with the static contacts.

[0036] An embodiment of the above application has at least the following advantages or beneficial effects:

[0037] The relay in this embodiment has a limiting structure on the elastic element. The limiting structure is located on the side of the movable contact component in the direction of movement. As the movable contact component gradually approaches the stationary contact component, the limiting structure can limit the movable contact component to a certain extent, reducing the amplitude of the swing of the movable contact component relative to the push rod assembly. This ensures the reliability and consistency of the contact between the movable contact component and the stationary contact component, avoids arcing between contacts due to poor contact, extends the service life of the contacts, and reduces the failure rate of the relay.

[0038] Furthermore, when the movable contact assembly is disconnected from the stationary contact, the limiting part of the elastic element clamps the movable contact assembly, preventing the movable contact assembly from swinging relative to the push rod assembly, thereby further improving the reliability and consistency of the contact.

[0039] Furthermore, during the overtravel phase, there is a gap between the limiting part and the movable contact component to prevent the limiting part and the movable contact component from rubbing against each other and generating scrapes.

[0040] Furthermore, when the movable contact component separates from the stationary contact, the limiting part can clamp the movable contact component to prevent it from swinging; after the movable contact component contacts the stationary contact, the limiting part separates from the movable contact component to prevent the limiting part and the movable contact component from rubbing against each other during the overtravel process and generating scraping.

[0041] Furthermore, the first positioning structure and the second positioning structure are positioned together, so that the limiting part can limit the movable contact component in the width direction of the movable contact component.

[0042] Furthermore, through the positioning cooperation of the first positioning structure and the second positioning structure, when the relay is disconnected, the movable contact component can achieve self-alignment under the action of the first positioning structure of the limiting part, which can provide precise positioning for the next relay closure, ensure that the contact resistance between the contacts remains unchanged, and improve contact reliability. Attached Figure Description

[0043] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0044] Figure 1 This is an exploded view of a relay according to an exemplary embodiment.

[0045] Figure 2 This is a schematic diagram of a relay according to an exemplary embodiment, wherein the housing and arc extinguishing unit are omitted.

[0046] Figure 3 It is along Figure 2 A cross-sectional view of section line AA in the middle.

[0047] Figure 4 It is along Figure 2 A cross-sectional view of the section line of BB.

[0048] Figure 5 This is a three-dimensional schematic diagram of two leaf springs connected as a single unit.

[0049] Figure 6 This is a cross-sectional view of the leaf spring and moving contact after assembly, with the leaf spring in its initial state.

[0050] Figure 7 This is a cross-sectional view of the leaf spring and moving contact after assembly, in which the moving and stationary contacts are in a fully closed state.

[0051] Figure 8 This is a top view of the moving component.

[0052] Figure 9 This is a side view of the moving component.

[0053] Figure 10 It is along Figure 9 A cross-sectional view with the CC section line in the middle.

[0054] Figure 11 yes Figure 10 A magnified view of the area at point X1.

[0055] Figure 12 This is an exploded schematic diagram of the moving component and the second magnetic conductor according to a first exemplary embodiment.

[0056] Figure 13 This is an exploded view of the moving component and the second magnetic conductor according to a second exemplary embodiment.

[0057] Figure 14 This is an exploded schematic diagram of the moving component and the second magnetic conductor according to a third exemplary embodiment. Detailed Implementation

[0058] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0059] It is understood that the terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0060] 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.

[0061] 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.

[0062] like Figure 1 and Figure 2As shown, the relay 1 in this embodiment includes a housing 10, a coil unit 20, an arc-extinguishing unit 30, and a sealing unit 40. The sealing unit 40 is disposed inside the housing 10, and the top of the stationary contact of the sealing unit 40 is exposed to the outer surface of the housing 10 through an exposure hole 11a. Both the coil unit 20 and the arc-extinguishing unit 30 are disposed inside the housing 10.

[0063] As an example, the outer casing 10 includes a first casing 11 and a second casing 12, which are connected to form a chamber for accommodating the coil unit 20, the arc-extinguishing unit 30, and the sealing unit 40. In an embodiment of this application, an exposure hole 11a is provided in the first casing 11.

[0064] 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.

[0065] As an example, the arc extinguishing unit 30 includes two permanent magnets 31. The two permanent magnets 31 are respectively disposed on both sides of the sealing unit 40 and are arranged opposite each other along the length direction of the moving contact piece.

[0066] 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.

[0067] 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, where the yoke clips 32 surround 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.

[0068] like Figure 3 and Figure 4 As shown, the sealing unit 40 includes a sealing shell 1000, a static contact assembly 50, a moving assembly 3000, and a magnetic circuit portion 4000.

[0069] 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.

[0070] 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.

[0071] The insulating cover 1100 includes a ceramic cover 1110 and a frame plate 1120. The ceramic cover 1110 is connected to the yoke plate 1200 via the frame plate 1120. The frame plate 1120 can be a ring-shaped metal component, such as an iron-nickel alloy, and one end of the frame plate 1120 is connected to the opening edge of the ceramic cover 1110, for example, by laser welding, brazing, resistance welding, or adhesive bonding. The other end of the frame plate 1120 is connected to the yoke plate 1200, also by laser welding, brazing, resistance welding, or adhesive bonding. The frame plate 1120 positioned between the ceramic cover 1110 and the yoke plate 1200 facilitates their connection.

[0072] The stationary contact assembly 50 includes at least one pair of stationary contacts 2000, which are mounted on a ceramic cover 1110.

[0073] 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 the embodiments of this application, the first through holes 1002 are formed on the ceramic cover 1110.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] Please continue reading. Figure 3 and Figure 4 The movable component 3000 includes multiple movable contact components 3100, push rod assembly 3200 and elastic element 3300 arranged side by side. The movable contact components 3100 are disposed inside the insulating cover 1100 and are mounted on the push rod assembly 3200 through the elastic element 3300.

[0078] 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.

[0079] It should be noted that if a pair of stationary contacts 2000 and multiple movable contact components 3100 are considered as a set, then the relay in the embodiments of this application may include multiple sets of combinations.

[0080] Each movable contact assembly 3100 includes a movable contact piece 3110, and multiple movable contact pieces 3110 are arranged side by side. The movable contact pieces 3110 are used to make or break contact with a pair of stationary contacts 2000. In the embodiments of this application, each movable contact piece 3110 has its two ends along a first direction D1 for contacting or separating from a pair of stationary contacts 2000. The first direction D1 is the arrangement direction of the pair of stationary contacts 2000. The length direction of the movable contact piece 3110 is parallel to the first direction D1.

[0081] 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.

[0082] In this embodiment of the application, 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. More specifically, 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.

[0083] In other embodiments, the number of movable contact pieces 3110 may be one, three, four, five, etc.

[0084] 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.

[0085] 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.

[0086] likeFigure 3 and Figure 4 As shown, 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 contacts 3110 are mounted within the space enclosed by the contact support 3220 via elastic members 3300.

[0087] Each sidewall 3222 of the contact support 3220 has a locking hole 3223 at its bottom end. The push rod 3210 includes a base 3211 and a rod portion 3212, with the base 3211 connected to one axial end of the rod portion 3212. The base 3211 has two clips 3213 on its sides, which respectively engage with the two locking holes 3223 of the contact support 3220 to fix the base 3211 to the contact support 3220. An elastic element 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.

[0088] In other embodiments, the contact support 3220 may also have other structures, which will not be listed here.

[0089] Understandably, the elastic element 3300 can be used to flexibly support multiple moving contacts 3110 and provide contact pressure.

[0090] Of course, in other embodiments, the push rod assembly 3200 may also adopt other structures, which will not be described in detail here.

[0091] Among them, multiple moving contact pieces 3110 are arranged side by side along the third direction D3.

[0092] Please continue reading. Figure 3 and Figure 4 The yoke plate 1200 has a second through hole 1210, which extends through two opposite sides of the yoke plate 1200 along its thickness direction and communicates with the contact chamber 1001 of the sealing shell 1000. A rod portion 3212 is axially movably inserted through the second through hole 1210. A base 3211 at one axial end of the rod portion 3212 is located within the contact chamber 1001.

[0093] 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.

[0094] Return to reference Figure 1 The coil unit 20 includes a coil frame 21 and a coil 22. The coil frame 21 is a hollow cylindrical shape and is made of insulating material. A metal cover 5000 is inserted inside the coil frame 21. The coil 22 surrounds the coil frame 21.

[0095] like Figure 3 and Figure 4 As shown, the magnetic circuit portion 4000 includes a stationary iron core 4300, a moving iron core 4400, and a reset member 4500. The stationary iron core 4300 is fixedly disposed within the metal cover 5000, and a portion of the stationary iron core 4300 extends into the second through hole 1210. The stationary iron core 4300 has a through hole 4310, which is positioned corresponding to the second through hole 1210, for the rod portion 3212 to pass through. The moving iron core 4400 is movably disposed within the metal cover 5000 and is positioned opposite the stationary iron core 4300 along the axial direction of the rod portion 3212. The moving iron core 4400 is connected to the rod portion 3212 and is attracted by the stationary iron core 4300 when the coil 22 is energized. The moving iron core 4400 and the rod portion 3212 can be connected by screwing, riveting, welding, or other methods.

[0096] 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.

[0097] 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.

[0098] During the overtravel process, the base 3211 will compress the elastic element 3300. After being compressed, the elastic element 3300 can provide elastic force to the moving contact 3110 to provide contact pressure.

[0099] Please continue reading. Figure 3 and Figure 4The relay 1 also includes a first magnetic conductor 6100, which 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.

[0100] In one embodiment, the first magnetic conductor 6100 is disposed on the side of the movable contact 3110 facing away from the elastic member 3300. In other words, the first magnetic conductor 6100 is disposed on the side of the movable contact 3110 facing the stationary contact 2000.

[0101] It is understandable that when the moving contact 3110 is energized, the first magnetic conductor 6100 is magnetized, thereby forming an attractive force on the moving contact 3110 in the direction of contact closure, thus achieving the purpose of short circuit prevention.

[0102] Furthermore, 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 member 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.

[0103] The number of second magnetic conductors 6200 corresponds to the number of moving contacts 3110. In this embodiment, there are two second magnetic conductors 6200, but this is not a limitation. The two second magnetic conductors 6200 are respectively fixedly connected to the side of the two moving contacts 3110 facing away from the stationary contact 2000.

[0104] When the two ends of the moving contact 3110 are in contact with a pair of stationary contacts 2000 respectively, 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 repulsive 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.

[0105] 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.

[0106] like Figure 3 and Figure 4As shown, the first magnetic conductor 6100 is disposed inside the sealing shell 1000 and is fixedly disposed relative to the sealing shell 1000. In this way, the suction force for short circuit protection is transferred to the sealing shell 1000. Since the sealing shell 1000 is a stationary component, there is no need for excessive coil holding force, thereby reducing the power consumption of the relay 1 coil and the size of the relay 1, and improving the short circuit protection capability.

[0107] Furthermore, the first magnetic conductor 6100 is connected to the ceramic cover 1110 of the insulating cover 1100 via the connector 300. The ceramic cover 1110 of the insulating cover 1100 is provided with a third through hole 1111; the connector 300 is rod-shaped and passes through the third through hole 1111; one end of the connector 300 is connected to the insulating cover 1100, and the other end is connected to the first magnetic conductor 6100.

[0108] The connection between one axial end of the connector 300 and the ceramic cover 1110 can be implemented in various ways, such as welding, riveting, screwing, or bonding. The connection between the other end of the connector 300 and the first magnetic conductor 6100 can also be implemented in various ways, such as welding, riveting, screwing, bonding, or snap-fitting.

[0109] It is understandable that when the connection between one end of the connector 300 and the ceramic cover 1110 is made by welding, by welding the connector 300 to the top wall of the ceramic cover 1110, the metallization layer can be processed only around the third through hole 1111 on the outer wall surface of the top wall, without the need to process the metallization layer on the inner wall surface of the top wall, which is convenient for processing and simplifies the processing steps.

[0110] It is understandable that one end of the connector 300 can be connected to the outer wall surface of the ceramic cover 1110, or to the inner wall surface of the ceramic cover 1110, or to both the outer and inner wall surfaces of the ceramic cover 1110 at the same time.

[0111] It can be seen that the first magnetic conductor 6100 is connected to the ceramic cover 1110 through the connector 300. On the one hand, the short-circuit resistance force is transferred to the ceramic cover 1110, so there is no need for excessive coil holding force, thereby reducing the power consumption of the relay 1 coil and the size of the relay 1, and improving the short-circuit resistance capability. On the other hand, since the connector 300 is connected to the ceramic cover 1110, it will not occupy too much space in the contact chamber, ensuring the arc extinguishing space of the arc extinguishing component and the movement space of the push rod.

[0112] In addition, the first magnetic conductor 6100 is connected to the rod-shaped connector 300, so that the first magnetic conductor 6100 and the connector 300 can be connected in a variety of ways, such as riveting, laser welding, snap-fitting, adhesive bonding, etc., which enriches the connection methods.

[0113] As an example, connector 300 is a solid rod. This allows connector 300 to be riveted to the first magnetic conductor 6100, making the connection more reliable. Furthermore, the solid rod provides higher support strength and is less prone to deformation.

[0114] 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). Specifically, the fixed bracket is located inside the sealing shell 1000 and is fixedly connected to the yoke plate 1200, and the first magnetic conductor 6100 is fixedly connected to the fixed bracket.

[0115] 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.

[0116] 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.

[0117] Optionally, the first magnetic conductor 6100 may include multiple stacked magnetic sheets. It is understood that by increasing the number of thinner magnetic sheets, the overall thickness of the first magnetic conductor 6100 can be increased. On the one hand, the thinner magnetic sheets can be manufactured using thin strips, resulting in lower material costs and ease of handling. On the other hand, the number of magnetic sheets can be flexibly adjusted according to the magnitude of the short-circuit current.

[0118] It should be noted that the elastic element 3300 can deform under the pressure of the push rod assembly 3200, thereby providing contact pressure to the movable contact assembly 3100. In one embodiment, the elastic element 3300 can be mounted on the push rod assembly 3200 and abut against the movable contact piece 3110. In another embodiment, the elastic element 3300 is mounted on the push rod assembly 3200 and abuts against the second magnetic conductor 6200. The following description will take the example of the elastic element 3300 being mounted on the push rod assembly 3200 and abutting against the movable contact piece 3110.

[0119] like Figures 5 to 7 , Figure 12 As shown, the elastic member 3300 has a limiting structure 140a, which is located on the side of the movable contact assembly 3100 in the direction of movement (second direction D2) and is used to limit the movable contact assembly 3100.

[0120] In the relay of this application embodiment, the elastic element 3300 has a limiting structure 140a. The limiting structure 140a is located on the side of the movable contact component 3100 in the direction of movement. As the movable contact component 3100 gradually approaches the stationary contact 2000, the limiting structure 140a can limit the movable contact component 3100 to a certain extent, reducing the swing amplitude of the movable contact component 3100, ensuring the reliability and consistency of the contact between the movable contact component 3100 and the stationary contact 2000, avoiding the generation of electric arc between contacts due to poor contact, extending the service life of the contacts, and reducing the failure rate of the relay.

[0121] In one embodiment, the limiting structure 140a includes at least two limiting portions 140, and the movable contact piece 3110 of the movable contact assembly 3100 is provided with at least one limiting portion 140 on each side along the first direction D1.

[0122] It should be noted that since the movable contact component 3100 is provided with limiting portions 140 on both sides of the first direction D1, the limiting portions 140 can limit the movable contact component 3100 in the first direction D1, which can prevent the movable contact component 3100 from swinging relative to the push rod component 3200 along the first direction D1 to a certain extent.

[0123] When the width of the limiting part 140 in the third direction D3 is large enough, the limiting part 140 can also restrict the movable contact component 3100 from rotating around the axis of the movable contact component 3100. The larger the width of the limiting part 140 in the third direction D3, the better the effect of the limiting part 140 in restricting the movable contact component 3100 from rotating.

[0124] like Figure 12 As shown, there are two movable contact components 3100 and two elastic elements 3300. Both elastic elements 3300 are mounted on the push rod assembly 3200 and abut against the two movable contact components 3100 respectively.

[0125] Each elastic member 3300 has two limiting portions 140. The two limiting portions 140 of an elastic member 3300 are located on both sides of the movable contact assembly 3100 corresponding to the elastic member 3300, so as to limit the movable contact assembly 3100.

[0126] Of course, in other embodiments, an elastic member 3300 may also have two or more limiting portions 140, such as three, four or other numbers. A portion of the multiple limiting portions 140 of the elastic member 3300 is provided on one side of the movable contact assembly 3100 along the first direction D1, and another portion of the limiting portions 140 is provided on the other side of the movable contact assembly 3100 along the first direction D1.

[0127] like Figure 6 As shown, when the movable contact piece 3110 of the movable contact assembly 3100 is in a disconnected state from the stationary contact 2000, the limiting portion 140 of the elastic member 3300 clamps the movable contact assembly 3100. It can be understood that when the movable contact piece 3110 is in a disconnected state from the stationary contact 2000, the elastic member 3300 is in its initial state. In its initial state, the elastic member 3300 has an initial deformation, meaning it can provide an initial elastic force to the movable contact piece 3110.

[0128] In the embodiments of this application, when the movable contact component 3100 is disconnected from the stationary contact 2000, the limiting portion 140 of the elastic member 3300 clamps the movable contact component 3100, preventing the movable contact component 3100 from swinging relative to the push rod assembly 3200, thereby further improving the reliability and consistency of the contact.

[0129] like Figure 7 As shown, during the overtravel phase, there is a gap between the limiting part 140 and the movable contact piece 3110 of the movable contact assembly 3100.

[0130] In the embodiments of this application, during the overtravel stage, there is a gap between the limiting part 140 and the movable contact component 3100, which can prevent the limiting part 140 and the movable contact component 3100 from rubbing against each other and generating scrapes.

[0131] It is understandable that the overtravel stage refers to the process in which the push rod assembly 3200 continues to move when the moving contact 3110 just makes contact with the stationary contact 2000; and the process in which the push rod assembly 3200 moves when the relay switches from a fully closed state to a state in which the moving contact 3110 just separates from the stationary contact 2000.

[0132] Furthermore, the overtravel phase includes a first overtravel phase and a second overtravel phase; wherein, the first overtravel phase refers to the process in which, during the switching of the relay from a fully open state to a fully closed state, the movable contact component 3100 just makes contact with the stationary contact 2000, and the push rod assembly 3200 continues to move until the relay is in a fully closed state; the second overtravel phase refers to the process in which, during the switching of the relay from a fully closed state to the point where the movable contact component 3100 just separates from the stationary contact 2000, the push rod assembly 3200 moves.

[0133] In the first overtravel phase, the elastic element 3300 deforms under the pressure of the push rod assembly 3200, and the limiting portions 140 on both sides of the movable contact assembly 3100 along the first direction D1 move away from each other. In the second overtravel phase, the limiting portions 140 on both sides of the movable contact assembly 3100 along the first direction D1 move towards each other until the limiting portions 140 clamp the movable contact assembly 3100.

[0134] Therefore, it can be seen that before the moving contact 3110 just contacts the stationary contact 2000, the limiting portion 140 of the elastic element 3300 clamps the movable contact assembly 3100 when the relay switches from the fully open state. This prevents the movable contact assembly 3100 from swinging relative to the push rod assembly 3200 during the movement of the push rod assembly 3200. As the push rod assembly 3200 continues to move, the relay enters the first overtravel stage. At this time, the movable contact assembly 3100 moves away from the limiting portions 140 on both sides of the first direction D1, avoiding friction between the limiting portions 140 and the movable contact assembly 3100 and causing scraping. As the push rod assembly 3200 continues to move, the distance between the limiting portions 140 and the movable contact assembly 3100 gradually increases. When the relay is in the fully closed state, the gap between the limiting portions 140 and the movable contact assembly 3100 reaches its maximum value.

[0135] When the relay switches from a fully closed state to a fully open state, a second overtravel phase must first be completed. After the second overtravel phase, the movable contact assembly 3100 begins to separate from the stationary contact 2000. During the second overtravel phase, the limiting portions 140 located on both sides of the movable contact assembly 3100 along the first direction D1 move towards each other. As the push rod assembly 3200 continues to move, the gap between the limiting portions 140 and the movable contact assembly 3100 gradually decreases. During the second overtravel phase, the movable contact assembly 3100 remains in contact with the stationary contact 2000. Just as the movable contact assembly 3100 separates from the stationary contact 2000, the limiting portions 140 along both sides of the movable contact assembly 3100 clamp the movable contact assembly 3100.

[0136] Therefore, in this embodiment of the application, when the movable contact component 3100 separates from the stationary contact 2000, the limiting part 140 can clamp the movable contact component 3100 to prevent the movable contact component 3100 from swinging; after the movable contact component 3100 contacts the stationary contact 2000, the limiting part 140 separates from the movable contact component 3100 to prevent the limiting part 140 and the movable contact component 3100 from rubbing against each other and generating scraping during the overtravel process.

[0137] It is understandable that "fully closed state" refers to the state of the relay when the moving iron core 4400 and the stationary iron core 4300 are in contact; "fully open state" refers to the state of the relay when the distance between the moving iron core 4400 and the stationary iron core 4300 reaches its maximum.

[0138] It should be added that when the magnetic circuit part 4000 does not include the stationary iron core 4300, the "fully closed state" refers to the state of the relay when the moving iron core 4400 is in contact with the yoke plate 1200.

[0139] like Figures 5 to 8 As shown, the limiting part 140 has a first positioning structure 143, and the movable contact piece 3110 of the movable contact assembly 3100 has a second positioning structure 3111. The first positioning structure 143 and the second positioning structure 3111 are positioned and engaged.

[0140] In the embodiments of this application, the first positioning structure 143 and the second positioning structure 3111 are positioned together, so that the limiting part 140 can limit the movable contact component 3100 in the width direction (third direction D3) of the movable contact component 3100.

[0141] In one embodiment, the first positioning structure 143 and the second positioning structure 3111 are respectively a protrusion 143a and a groove 3111a, and the protrusion 143a can be inserted into the groove 3111a.

[0142] For example, the limiting part 140 has a protrusion 143a on the side surface facing the movable contact piece 3110, and the movable contact piece 3110 has a groove 3111a on the side surface facing the limiting part 140; or, the limiting part 140 has a groove 3111a on the side surface facing the movable contact piece 3110, and the movable contact piece 3110 has a protrusion 143a on the side surface facing the limiting part 140.

[0143] In one implementation, such as Figure 8 As shown, the groove wall of the groove 3111a has a guide surface 3111b, which is configured to guide the protrusion 143a to be inserted into the groove 3111a.

[0144] In the embodiments of this application, the guide surface 3111b is configured to guide the protrusion 143a to be inserted into the groove 3111a, so that when the relay is disconnected, the movable contact component 3100 can achieve self-alignment under the action of the guide surface 3111b, which can provide precise positioning for the next relay closure, ensure that the contact resistance between the contacts remains unchanged, and improve the reliability of the contact.

[0145] As an example, the guide surface 3111b can be an inclined surface or a curved surface, and this application does not limit it.

[0146] In one embodiment, when the movable contact assembly 3100 is disconnected from the stationary contact 2000, at least a portion of the protrusion 143a is located within the groove 3111a. During overtravel, the protrusion 143a is located outside the groove 3111a.

[0147] In the embodiments of this application, during the overtravel process, the movable contact component 3100 and the elastic element 3300 move relative to each other. At this time, the protrusion 143a is located outside the groove 3111a, which can prevent the protrusion 143a from rubbing against the movable contact component 3100.

[0148] Of course, in other embodiments, during the overtravel process, at least a portion of the protrusion 143a may also be located within the groove 3111a, and the protrusion 143a may not contact the groove wall of the groove 3111a, thus avoiding friction between the protrusion 143a and the movable contact component 3100.

[0149] like Figure 5 and Figure 6 As shown, the elastic element 3300 is a leaf spring 100, which is connected to the push rod assembly 3200 and abuts against the movable contact piece 3110. The leaf spring 100 includes a base 110 and two spring arms 120. The base 110 is connected to the base 3211 of the push rod assembly 3200, and each end of the base 110 along the first direction D1 is provided with a spring arm 120. The two spring arms 120 are bent and connected to the two ends of the base 110, and the two spring arms 120 abut against the two ends of the movable contact piece 3110. The end of the spring arm 120 away from the base 110 has a limiting portion 140.

[0150] like Figure 5 As shown, two leaf springs 100 are arranged side by side, and the bases 110 of the two leaf springs 100 are integrally connected.

[0151] like Figure 5 and Figure 6 As shown, the spring arm 120 includes a deformable portion 122 and a supporting portion 123. One end of the deformable portion 122 is connected to the base 110; wherein, when the push rod assembly 3200 compresses the leaf spring 100, the deformable portion 122 deforms to provide contact pressure. The supporting portion 123 abuts against the side surface of the movable contact 3110 facing away from the stationary contact 2000, one end of the supporting portion 123 is connected to the other end of the deformable portion 122, and the other end of the supporting portion 123 is connected to the limiting portion 140.

[0152] like Figure 5 As shown, the support portion 123 has a protrusion 1231 that abuts against the movable contact piece 3110.

[0153] In this embodiment of the application, a protrusion 1231 is provided on the support portion 123. The contact area between the protrusion 1231 and the movable contact piece 3110 is reduced, thus avoiding the problem of scraping caused by friction between the leaf spring 100 and the movable contact piece 3110.

[0154] As an example, the protrusion 1231 is hemispherical, so that the protrusion 1231 forms point contact with the movable contact piece 3110.

[0155] like Figure 6 and Figure 7 As shown, the limiting part 140 includes a vertical section 141 and an inclined section 142. One end of the vertical section 141 is connected to the end of the spring arm 120 away from the base 110, and the inclined section 142 is connected to the other end of the vertical section 141 and extends from the vertical section 141 in a direction away from the moving contact 3110 and close to the stationary contact 2000.

[0156] In this embodiment of the application, the inclined segment 142 is connected to the other end of the vertical segment 141 and extends from the vertical segment 141 in a direction away from the moving contact piece 3110 and close to the stationary contact 2000, so that a flared structure is formed between the limiting portions 140 at both ends of the leaf spring 100, which facilitates the assembly of the leaf spring 100 and the moving contact piece 3110.

[0157] like Figure 6 As shown, the distance from the end of the limiting part 140 away from the supporting part 123 to the supporting part 123 is L1, the thickness of the movable contact piece 3110 is L2, L1 / L2 is R, and 1 / 2≤R≤1.

[0158] In the embodiments of this application, when the limiting part 140 clamps the movable contact piece 3110, since 1 / 2≤R≤1, the limiting part 140 can cover more than half of the thickness dimension of the movable contact piece 3110, thereby strengthening the limiting effect of the limiting part 140 on the movable contact piece 3110.

[0159] like Figures 9 to 11 As shown, the base 3211 has a boss 3215 facing the movable contact piece 3110; the base 110 of the leaf spring 100 is connected to the side surface of the boss 3215 facing away from the base 3211. The base 110 has a limiting hole 111, and a protruding post 3214 protrudes from the side surface of the boss 3215 facing away from the base 3211. The protruding post 3214 is inserted into the limiting hole 111, and the side surface of the base 110 facing away from the movable contact piece 3110 abuts against the side surface of the boss 3215 facing the movable contact piece 3110.

[0160] The shape of the limiting hole 111 can have various embodiments. When the base 110 has one limiting hole 111, the shape of the limiting hole 111 can be a non-circular shape such as a rectangle, ellipse, or triangle, which can prevent the base 3211 from rotating relative to the base 110 and achieve an anti-rotation effect. When the base 110 has two or more (including two) limiting holes 111, the shape of the limiting hole 111 can be circular or non-circular.

[0161] like Figure 11 As shown, a raised ring 112 is provided on the side surface of the base 110 facing the movable contact 3110. The raised ring 112 surrounds the limiting hole 111, and the inner ring surface 112b of the raised ring 112 is flush with the hole wall of the limiting hole 111. Furthermore, the raised ring 112 is formed by folding the edge of the limiting hole 111 of the base 110 toward the movable contact 3110.

[0162] By providing a protruding ring 112 at the edge of the limiting hole 111, the friction between the protruding post 3214 and the base 110 can be reduced and the generation of chips can be prevented when the base 110 and the base 3211 are assembled.

[0163] The protruding ring 112 has a top surface 112a facing away from the base 110, and a chamfer 113 is provided at the connection between the top surface 112a and the inner ring surface 112b. By providing a chamfer 113 at the connection between the top surface 112a and the inner ring surface 112b, burrs generated during the forming of the protruding ring 112 can be eliminated, and scraping is further prevented between the protruding post 3214 and the inner ring surface 112b of the protruding ring 112.

[0164] As a modified embodiment, the limiting structure 140 may include only one limiting part 140. The limiting part 140 may be disposed on one side of the movable contact component 3100 along the first direction D1, or on one side of the movable contact component 3100 along the third direction D3.

[0165] As another modified embodiment, the limiting structure 140 includes at least two limiting portions 140, and the movable contact component 3100 may be provided with at least one limiting portion 140 on each side along the third direction D3.

[0166] like Figure 13 As shown, the similarities between the second embodiment and the first embodiment will not be repeated here, but the differences are as follows:

[0167] The number of movable contact components 3100 and leaf springs 100 is one each.

[0168] like Figure 14 As shown, the similarities between the third embodiment and the first embodiment will not be repeated here, but the differences are as follows:

[0169] There are three movable contact components 3100 and three leaf springs 100, with the bases 110 of the three leaf springs 100 integrally connected. The bases 110 of the three leaf springs 100 are all connected to the push rod assembly 3200, and the three leaf springs 100 respectively abut against the three movable contact components 3100 in the second direction D2, for providing contact pressure to their respective movable contact components 3100.

[0170] In summary, the relays of the embodiments of this application have at least the following advantages and beneficial effects:

[0171] In the relay of this application embodiment, the elastic element 3300 has a limiting structure 140a. The limiting structure 140a is located on the side of the movable contact assembly 3100 in the direction of movement. As the movable contact assembly 3100 gradually approaches the stationary contact 2000, the limiting part 140a can limit the movable contact assembly 3100 to a certain extent, reducing the amplitude of the swing of the movable contact assembly 3100 relative to the push rod assembly 3200. This ensures the reliability and consistency of the contact between the movable contact assembly 3100 and the stationary contact 2000, avoids the generation of electric arc between contacts due to poor contact, extends the service life of the contacts, and reduces the failure rate of the relay.

[0172] Furthermore, when the movable contact assembly 3100 is disconnected from the stationary contact 2000, the limiting portion 140 of the elastic element 3300 clamps the movable contact assembly 3100, preventing the movable contact assembly 3100 from swinging relative to the push rod assembly 3200, thereby further improving the reliability and consistency of the contact.

[0173] Furthermore, during the overtravel phase, there is a gap between the limiting part 140 and the movable contact component 3100 to prevent the limiting part 140 and the movable contact component 3100 from rubbing against each other and generating scrapes.

[0174] Furthermore, when the movable contact component 3100 separates from the stationary contact 2000, the limiting part 140 can clamp the movable contact component 3100 to prevent the movable contact component 3100 from swinging; after the movable contact component 3100 contacts the stationary contact 2000, the limiting part 140 separates from the movable contact component 3100 to prevent the limiting part 140 and the movable contact component 3100 from rubbing against each other and generating scraping during overtravel.

[0175] Furthermore, the first positioning structure 143 and the second positioning structure 3111 are positioned together, so that the limiting part 140 can limit the movable contact component 3100 in the width direction (third direction D3) of the movable contact component 3100.

[0176] Furthermore, the guide surface 3111b is configured to guide the protrusion 143a into the groove 3111a, so that when the relay is disconnected, the movable contact component 3100 can achieve self-alignment under the action of the guide surface 3111b, which can provide precise positioning for the next relay closure, ensure that the contact resistance between the contacts remains unchanged, and improve contact reliability.

[0177] It is understood that the various embodiments / implementations provided in this application can be combined with each other without creating contradictions, and will not be described one by one here.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application examples.

Claims

1. A relay characterized by comprising: The application relates to a relay, which comprises: a static contact assembly; a movable contact assembly, which comprises a movable contact piece for conducting or disconnecting with the static contact assembly; a push rod assembly for driving the movable contact assembly to move; and a spring configured to provide contact pressure to the movable contact piece by being extruded by the push rod assembly, wherein the spring has a limiting structure on the side of the movable contact assembly in the moving direction of the movable contact assembly for limiting the movable contact assembly. The limiting structure comprises at least two limiting parts, and at least one limiting part is arranged on each side of the movable contact assembly in a first direction, which is the length direction of the movable contact piece.

2. The relay according to claim 1, characterized in that When the movable contact piece is disconnected with the static contact assembly, at least two limiting parts of the spring clamp the movable contact assembly.

3. The relay according to claim 2, characterized in that During the overstroke stage, there is a gap between the limiting parts and the movable contact assembly.

4. The relay according to claim 2 or 3, characterized in that The overstroke stage comprises a first overstroke stage and a second overstroke stage; wherein the first overstroke stage refers to the process that, when the relay is switched from a completely disconnected state to a completely closed state, the push rod assembly continues to move until the relay is in the completely closed state after the movable contact piece just contacts the static contact assembly; the second overstroke stage refers to the process that, when the relay is switched from the completely closed state to the state that the movable contact piece just separates from the static contact assembly, the push rod assembly moves; 5. The relay of claim 4, wherein During the first overstroke stage, the spring is deformed by being extruded by the push rod assembly, and the limiting parts on both sides of the movable contact assembly in the first direction move towards the direction of moving away from each other; During the second overstroke stage, the limiting parts on both sides of the movable contact assembly in the first direction move towards the direction of moving closer to each other until the limiting parts clamp the movable contact assembly. The limiting parts have a first positioning structure, and the movable contact assembly has a second positioning structure, and the first positioning structure and the second positioning structure are positioned and matched.

6. The relay of claim 2, wherein One of the first positioning structure and the second positioning structure is a protrusion, and the other is a groove, and the protrusion is used for being inserted into the groove.

7. The relay according to claim 6, characterized in that When the movable contact piece is disconnected with the static contact assembly, at least part of the protrusion is located in the groove.

8. The relay according to claim 7, characterized in that During the overstroke process, the protrusion is located outside the groove.

9. The relay of claim 7, wherein The groove wall has a guide surface configured to guide the protrusion to be inserted into the groove.

10. The relay of claim 7, wherein The spring is a leaf spring, which comprises a base and two spring arms, the base is connected to the push rod assembly, the two spring arms are respectively bent and connected to the two ends of the base in the first direction, and the two spring arms respectively abut the two ends of the movable contact assembly in the first direction; 11. The relay of claim 2, wherein The end of the spring arm away from the base has the limiting part. The spring arm further comprises:

12. The relay of claim 11, wherein, a deformation part, one end of the deformation part is connected to the base; wherein, when the push rod assembly extrudes the spring, the deformation part is deformed to provide contact pressure. ​ The supporting part is connected with the other end of the deforming part, and the other end of the supporting part is connected with the limiting part.

13. The relay of claim 12, wherein, The supporting part is connected with the other end of the deforming part, and the other end of the supporting part is connected with the limiting part. The distance from the end of the limiting part away from the supporting part to the supporting part is L1, the thickness of the movable contact piece is L2, L1 / L2 is R, and 1 / 2≤R≤1.

14. The relay of claim 12, wherein, The supporting part has a protruding part connected with the movable contact assembly.

15. The relay of claim 11, wherein, The limiting part comprises: A vertical segment, one end of the vertical segment being connected with the end of the spring arm away from the base; An inclined segment connected with the other end of the vertical segment and extending from the vertical segment towards the direction away from the movable contact assembly and close to the static contact assembly.

16. The relay of claim 1, wherein The elastic member is connected with the pushing rod assembly and connected with the movable contact piece, each side of the movable contact piece along the first direction is provided with the limiting structure, and the first direction is the length direction of the movable contact piece.

17. The relay of claim 1, wherein The number of the movable contact assemblies is equal to the number of the elastic members, and both are multiple; the multiple elastic members are connected with the pushing rod assembly, and the multiple elastic members are respectively connected with the multiple movable contact assemblies in the moving direction of the pushing rod assembly, for providing contact pressure to the respective corresponding movable contact assemblies.

18. The relay of claim 17, wherein, The elastic member is a leaf spring, and comprises a base and two spring arms, the base is connected with the pushing rod assembly, the two spring arms are respectively connected with the two ends of the base along the first direction, and the two spring arms are respectively connected with the two ends of the movable contact assembly along the first direction; the bases of the multiple elastic members are integrally connected; the first direction is the length direction of the movable contact piece.

19. The relay of claim 1, wherein, The static contact assembly comprises at least one pair of static contact heads, and the movable contact piece is used for conducting or disconnecting with the static contact heads.

Images