A self-resetting relay

Abstract

The utility model relates to a kind of self-resetting relay, including base and the electromagnetic mechanism equipped on it, electromagnetic mechanism includes core, coil, armature and contactor group, contactor group has opposite static contact and moving contact, coil surrounds core, armature middle fulcrum portion rotatably equipped in base, one end is suction end, the other end is driving end, core energization suction armature suction end, make driving end rotate to contactor group, drive moving contact and static contact closure, moving contact is equipped with first elastic member, for making driving end leave moving contact, moving contact includes vertical fixed sheet, helical elastic member and moving contact piece, helical elastic member has helical portion and the first, second pin of upper and lower two ends, helical portion is spring structure, moving contact piece and fixed sheet are respectively inserted with pin, fixed sheet is fixed in base, armature driving end acts on moving contact piece to make it and static contact closure.Improve moving contact piece elastic structure, solve the problem of traditional moving contact piece elasticity deficiency, easy to break.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a self-resetting relay. Background Technology

[0002] Relays, as commonly used control components in circuits, function primarily to achieve the opening and closing of contacts via electromagnetic drive, and are widely used in electronic equipment, automation control, and other fields. For example, the "Push-plate Anti-rotation Relay" with patent number CN217822601U has a specific structure including a housing, yoke, core, coil, armature, stationary terminal, elastic terminal (i.e., moving contact), and push plate. The housing is composed of a base and a top cover that are fastened together. The base has a mounting boss, which engages with the yoke through a positioning groove and a mating groove to secure the yoke. The core is located in the middle of the yoke, the coil surrounds the core, and the armature is rotatably connected to the yoke. The push plate is located between the armature and the elastic terminal, and the push plate achieves a transmission connection through a square first connecting post engaging with a square first connecting hole in the armature and a circular second connecting post engaging with a circular second connecting hole in the elastic terminal. A limiting plate is provided on the inner side of the top cover to limit the push plate's travel. The mounting boss of the base also has a mounting groove with a built-in elastic reset auxiliary component that abuts against the armature. This type of relay has the following defects: Firstly, the lower ends of the stationary and resilient terminals are inserted into the base. The resilient terminal is an integral resilient structure, and its elastic function relies on the structural deformation of the terminal itself. In long-term repeated switching operations, it needs to continuously withstand bending deformation, which can easily lead to terminal elastic fatigue, elastic decay, and even breakage. The resilient terminal cannot accurately reset, resulting in poor contact and incomplete disconnection of the relay contacts. Secondly, the push plate is a fixed-length integral structure without telescopic adjustment function. When the resilient terminal becomes loose or deformed after long-term use, or when there are minor errors in the assembly process, the fixed-length push plate cannot adapt to the position change of the moving contact, which can easily lead to insufficient push plate stroke and inability to accurately push the moving contact. At the same time, the contact between the push plate and the resilient terminal lacks an effective buffer structure, which will aggravate component wear. The accumulation of dust and debris will further affect the transmission accuracy, reduce the operating stability and service life of the relay, and fail to meet the needs of high-precision control scenarios. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art by providing a self-resetting relay. By improving the elastic structure design of the moving contact, the problem of insufficient elasticity and easy breakage of the traditional moving contact body is solved.

[0004] The technical solution of this utility model is as follows: A self-resetting relay includes a base and an electromagnetic mechanism mounted on the base. The electromagnetic mechanism includes an iron core, a coil, an armature, and a contact group. The contact group includes a stationary contact and a moving contact arranged opposite to each other. The coil is arranged around the iron core. The fulcrum of the armature is rotatably mounted on the base, with one end being a closing end and the other end being a driving end. When the iron core is energized, it attracts the closing end of the armature, causing the driving end to rotate towards the contact group, thereby driving the moving contact to contact and close with the stationary contact. The moving contact is equipped with a first elastic element. The first elastic element is used to drive the driving end to rotate away from the moving contact; the moving contact includes a fixed plate, a spiral elastic element and a moving contact plate arranged in a vertical direction, the spiral elastic element has a spiral part and a first pin and a second pin formed by the spiral part extending to the upper and lower ends respectively, the spiral part is a spiral spring structure; the moving contact plate and the fixed plate are respectively connected and fixed to the first pin and the second pin of the spiral elastic element, the fixed plate is fixed on the base, and the driving end of the armature acts on the moving contact plate to drive the moving contact plate to contact and close with the stationary contact.

[0005] By adopting the above technical solution, the moving contact is designed as a combination structure of a fixed plate, a spiral elastic element, and a moving contact plate. The spiral part of the spiral elastic element is a spiral spring structure, and the pins at both ends are connected and fixed to the fixed plate and the moving contact plate respectively. Compared with the problem of easy damage of traditional single spring-type moving contacts, the spiral elastic element provides elastic force for the contact and reset of the moving contact plate without causing elastic deformation of the moving contact plate. The moving contact plate is not easily damaged, and the spiral elastic element has high elasticity, is not easy to fail, and is easy to replace. At the same time, this split structure makes the assembly of the moving contact plate and the fixed plate more flexible. Different specifications of spiral elastic elements can be replaced to adapt to relays with different reset force requirements, thus expanding the application range of the product. With the reset function of the first elastic element, the armature and the moving contact are reset after the relay is de-energized, resulting in a faster reset response and a more accurate reset position without jamming. The moving contact receives the thrust from the armature drive end towards the stationary contact, causing the moving contact to close and the stationary contact to shut down. The helical elastic element then undergoes elastic deformation towards the stationary contact. Once the drive end is removed, the helical elastic element releases its stored elastic potential energy, quickly pushing the moving contact back to its original position, ensuring reliable contact disconnection. This design not only improves the reliability of the relay operation but also significantly extends the service life of the moving contact, as it no longer needs to withstand repeated elastic deformation, thus avoiding the risk of elastic fatigue and breakage.

[0006] A further feature of this invention is that the first pin and the second pin are in the form of a sheet, the first pin is welded to the moving contact piece for fixation or inserted for positioning; and the second pin is welded to the fixed piece for fixation or inserted for positioning.

[0007] By adopting the above-mentioned further settings, the stability of the connection between the first pin and the moving contact and the second pin and the fixed contact can be ensured. Whether it is a permanent connection method such as welding fixation or a method such as plug-in positioning that is easy to disassemble and replace, it can meet the needs of different usage scenarios, further enhance the reliability and practicality of the relay structure, and also provide convenience for subsequent maintenance, replacement of parts and other operations.

[0008] A further feature of this invention is that the drive end of the armature is provided with a push rod for pushing the contact piece. One end of the push rod is fitted to the drive end of the armature through a sliding sleeve. The push rod passes through the sliding sleeve and can be axially extended and retracted to adjust its length. The push rod is locked to the sliding sleeve by a locking member.

[0009] With the above-mentioned further configuration, an axially extendable and adjustable push rod is installed at the armature drive end, and its length is fixed by a locking device. When the relay operates, the armature applies force directly to the moving contact through the push rod. The adjustable length of the push rod allows the same relay to be adapted to stationary contacts with different stroke requirements. The extension of the push rod can be adjusted by loosening the locking device, and the stability of the operation can be ensured by re-locking it after adjustment.

[0010] A further feature of this invention is that the other end of the push rod is provided with a rod head that can slide along its axial direction, and a second elastic element is provided between the rod head and the push rod. When the push rod pushes the contact piece, the second elastic element drives the rod head to press against the moving contact piece.

[0011] With the above-mentioned further configuration, by setting a sliding rod head at the end of the push rod and setting a second elastic element between the rod head and the push rod, when the push rod pushes the contact piece, the second elastic element can provide a buffering force, avoid the push rod from generating a rigid impact on the moving contact piece, reduce the wear of the moving contact piece and the stationary contact piece at the moment of contact, and extend the service life of the contact.

[0012] A further feature of this invention is that the rod head is slidably assembled in the movable channel of the push rod, the outer circumference of the push rod is provided with a movable hole along the axial direction, the rod head is provided with a positioning hole, a positioning pin passes through the movable hole and is positioned in the positioning hole, and the positioning pin can slide along the axial direction of the movable hole.

[0013] With the above-mentioned further configuration, the rod head is slidably assembled into the movable channel of the push rod, and a locating pin is used to pass through the movable hole of the push rod and the locating hole of the rod head to limit the sliding stroke of the rod head and prevent the rod head from falling out of the push rod; the locating pin can slide axially in the movable hole to provide guidance for the buffered movement of the rod head and ensure that the rod head will not deviate during the sliding process.

[0014] A further feature of this invention is that a through hole is provided on the fulcrum of the armature, a bracket is provided on the base, a spring is installed on the bracket, the lower end of the spring is fixed to the bracket, and the upper end of the spring passes through the through hole of the armature and presses the armature onto the bracket.

[0015] With the above-mentioned further configuration, a spring is fixed on the base bracket. The upper end of the spring passes through the through hole of the armature fulcrum and presses the armature onto the bracket. The pressing force of the spring ensures a tight contact between the armature fulcrum and the bracket and smooth rotation, preventing the armature from shaking or getting stuck during rotation, and improving the sensitivity of the armature's engagement and reset actions. The installation method of the spring is simple, requiring no additional rotating shaft components, which simplifies the assembly structure of the armature. At the same time, the elastic force of the spring can compensate for the wear gap of the fulcrum and maintain the stability of the armature during long-term operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the present utility model; Figure 2 This is a schematic diagram of the moving contact structure of a specific embodiment of the present utility model; Figure 3 This is a schematic diagram of the push rod structure according to a specific embodiment of the present utility model; Figure 4 This is a split view of the push rod according to a specific embodiment of the present utility model; Figure 5 This is a structural diagram of the armature in a specific embodiment of the present utility model. Detailed Implementation

[0017] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] like Figure 1-5As shown, this utility model discloses a self-resetting relay, including a base 1 and an electromagnetic mechanism 2 mounted on the base. The electromagnetic mechanism 2 includes an iron core 21, a coil 22, an armature 23, and a contact group. The contact group includes a stationary contact 24 and a moving contact 25 arranged opposite to each other. The coil 22 surrounds the iron core 21. The fulcrum 231 in the middle of the armature 23 is rotatably mounted on the base 1, with one end being a pull-in end 232 corresponding to the end of the iron core 21, and the other end being a drive end 233 corresponding to the moving contact 25. When the iron core 21 is energized, it attracts the armature 23's attracting end 232, causing the driving end 233 to rotate toward the contact group side, thereby driving the moving contact 25 to contact and close with the stationary contact 24. The moving contact 25 is equipped with a first elastic element 26, which is used to drive the driving end 233 to rotate away from the moving contact 25. The first elastic element 26 is a tension spring, with one end hooked to the base and the other end hooked to the armature 23's driving end 233, to provide the armature 23's return force. The first elastic element 26 can also be an elastic sheet structure. The movable contact 25 includes a fixed plate 251, a helical elastic element 252, and a movable contact 253 arranged vertically. The helical elastic element 252 is made of conductive metal and has a helical portion 2521, and a first pin 2522 and a second pin 2523 extending upward and downward from the helical portion 2521, respectively. The helical portion 2521 has a helical spring structure and can undergo elastic deformation. The movable contact 253 and the fixed plate 251 are respectively connected and fixed to the first pin 2522 and the second pin 2523 of the helical elastic element 252. The fixed plate 251 is fixed to the base 1. The driving end 233 of the armature 23 acts on the movable contact 253 to drive the movable contact 253 to contact and close with the stationary contact 24. The first pin 2522 and the second pin 2523 have a plate-like structure. The first pin 2522 is welded and fixed to the movable contact 253 or inserted for positioning; the second pin 2523 is welded and fixed to the fixed plate 251 or inserted for positioning. Both the first and second pins have insert portions with helical teeth on their sides. The moving contact and the fixed contact are respectively provided with upper and lower mounting slots adapted to the insert portions. The inner walls of the upper and lower mounting slots are provided with meshing teeth that engage with the helical teeth. The insert portions of the first and second pins are inserted into the upper and lower mounting slots respectively, and the insertion and positioning of the first pin with the moving contact and the second pin with the fixed contact are achieved through the engagement of the helical teeth on the insert portions with the corresponding meshing teeth on the slot walls. Multiple helical teeth and meshing teeth are spaced vertically. The lower ends of the fixed contact and the stationary contact are attached to the base by screws or inserts. The moving contact 253 corresponds to the contact point of the stationary contact 24 and has a contact point that matches the stationary contact 24.

[0019] Specifically, the drive end 233 of the armature 23 is provided with a push rod 31 for pushing the contact piece 253. One end of the push rod 31 is assembled to the drive end 233 of the armature 23 through a sliding sleeve 33. The push rod 31 passes through the sliding sleeve 33 and can be axially extended and retracted to adjust its length. The push rod 31 is locked to the sliding sleeve by a locking member 34. The locking member can be a locking nut or a locking screw. For example, if a threaded hole is provided on the side wall of the sliding sleeve, the locking screw is threaded through the threaded hole. When the locking screw is tightened, its end presses against the push rod to restrict the axial sliding of the push rod.

[0020] The sliding sleeve 33 is fixedly mounted on the driving end 233 of the armature 23. The other end of the push rod 31 has a rod head 32 that can slide axially. A second elastic element 35 is provided between the rod head 32 and the push rod 31. The second elastic element 35 is a compression spring, sleeved outside the rod head, with one end pressing against the push rod and the other end pressing against the stepped surface of the rod head 32. When the push rod 31 pushes against the contact piece 25, the second elastic element 35 drives the rod head 32 to press against the moving contact piece 253. The rod head 32 is slidably fitted within the movable channel 311 of the push rod 31. A movable hole 312 is provided on the outer periphery along the axial direction. The movable hole 312 is an elongated through hole. The rod head 32 is provided with a positioning hole 321. A positioning pin 36 passes through the movable hole 312 and is positioned and inserted into the positioning hole 321. The positioning pin 36 can slide smoothly in the movable hole 312. The positioning pin can slide along the axial direction of the movable hole 312, thereby guiding the rod head 32 to move linearly along the axial direction of the push rod 31 and ensuring that the rod head 32 will not come out of the movable channel 311 during the sliding process. Specifically, the armature 23 has a through hole 2311 on its fulcrum 231, and a bracket 11 is provided on the base 1. The bracket 11 is fixed to the base 1 by screws or welding, and a spring 4 is installed on it. The lower end of the spring 4 is fixed to the bracket 11. The fixing method can be riveting, welding or screw connection, etc. After the upper end of the spring 4 passes through the through hole 2311 of the armature 23, it is bent to press the armature 23 down onto the upper end face of the bracket 11, thereby realizing the rotatable assembly of the armature. The elastic force of the spring can ensure that the armature rotates smoothly and without shaking.

[0021] The working principle of this utility model is as follows: 1. Energizing and engaging process: After the coil is energized, the iron core generates electromagnetic attraction, attracting the armature's engaging end, causing the armature to rotate around the fulcrum. The driving end swings towards the moving contact, driving the push rod to move towards the moving contact piece. The rod head first contacts the moving contact piece, compressing the second elastic element and generating a buffering force. At the same time, it pushes the moving contact piece towards the stationary contact piece until the contact point of the moving contact piece and the contact point of the stationary contact piece are in close contact, realizing circuit conduction. During this process, the spiral part of the spiral elastic element undergoes elastic deformation, storing elastic potential energy.

[0022] 2. Power-off reset process: After the coil is de-energized, the electromagnetic attraction of the iron core disappears, and the pulling force of the first elastic element drives the armature to rotate in the opposite direction, moving the driving end away from the moving contact. At the same time, the spiral part of the spiral elastic element releases elastic potential energy, pushing the moving contact to reset, so that the contact of the moving contact separates from the contact of the stationary contact, thus breaking the circuit.

[0023] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A self-resetting relay, comprising a base (1) and an electromagnetic mechanism (2) mounted on the base, the electromagnetic mechanism (2) comprising an iron core (21), a coil (22), an armature (23) and a contact group, the contact group comprising a stationary contact (24) and a moving contact (25) disposed opposite to each other, the coil (22) surrounding the iron core (21), and the fulcrum (231) in the middle of the armature (23) being rotatably mounted on the base (1), one end of which is a suction point. The iron core (21) is energized and attracts the armature (23) to the attracting end (232), causing the driving end (233) to rotate toward the contact group, thereby driving the moving contact (25) to contact and close with the stationary contact (24). The moving contact (25) is equipped with a first elastic element (26), which is used to drive the driving end (233) to rotate away from the moving contact (25). The key feature is that: The movable contact (25) includes a fixed piece (251) arranged in a vertical direction, a spiral elastic element (252) and a movable contact piece (253). The spiral elastic element (252) has a spiral part (2521) and a first pin (2522) and a second pin (2523) formed by the spiral part (2521) extending to the upper and lower ends respectively. The spiral part (2521) has a spiral spring structure. The movable contact piece (253) and the fixed piece (251) are respectively connected and fixed to the first pin (2522) and the second pin (2523) of the spiral elastic element (252). The fixed piece (251) is fixed on the base (1). The driving end (233) of the armature (23) acts on the movable contact piece (253) to drive the movable contact piece (253) to contact and close with the stationary contact (24).

2. The self-resetting relay according to claim 1, characterized in that: The first pin (2522) and the second pin (2523) are in the form of a sheet structure. The first pin (2522) is welded to the moving contact (253) for fixation or plug-in positioning. The second pin (2523) is welded to the fixed piece (251) for fixation or plug-in positioning.

3. The self-resetting relay according to claim 1 or 2, characterized in that: The drive end (233) of the armature (23) is provided with a push rod (31) for pushing the contact plate (253). One end of the push rod (31) is assembled to the drive end (233) of the armature (23) through a sliding sleeve (33). The push rod (31) passes through the sliding sleeve (33) and can be axially extended and retracted to adjust its length. The push rod (31) is locked on the sliding sleeve by a locking member (34).

4. The self-resetting relay according to claim 3, characterized in that: The other end of the push rod (31) is provided with a rod head (32) that can slide along its axial direction. A second elastic element (35) is provided between the rod head (32) and the push rod (31). When the push rod (31) pushes the contact (25), the second elastic element (35) drives the rod head (32) to press against the moving contact piece (253).

5. The self-resetting relay according to claim 4, characterized in that: The rod head (32) is slidably assembled in the movable channel (311) of the push rod (31). The push rod (31) has a movable hole (312) axially opened on its outer periphery. The rod head (32) has a positioning hole (321). A positioning pin (36) passes through the movable hole (312) and is positioned in the positioning hole (321). The positioning pin (36) can slide axially along the movable hole (312).

6. The self-resetting relay according to claim 1 or 2, characterized in that: The armature (23) has a through hole (2311) on its fulcrum (231), and the base (1) has a bracket (11) on it. A spring (4) is installed on the bracket (11). The lower end of the spring (4) is fixed to the bracket (11), and the upper end of the spring (4) passes through the through hole (2311) of the armature (23) and presses the armature (23) onto the bracket (11).

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