Multi-stable self-locking energy-saving relay

Abstract

The utility model discloses a multistable self-locking energy-saving relay which comprises a wire inlet terminal, a wire outlet terminal, a contact assembly and a magnetic circuit mechanism which are arranged on a shell, and the magnetic circuit mechanism comprises a magnet yoke, a bidirectional coil structure, an iron core, a driving rod and a permanent magnet. The iron core and the driving rod are movably arranged in a guide cavity in the bidirectional coil structure and form linkage fit, and the iron core reciprocates under the action of two magnetic field forces which are generated by the bidirectional coil structure and are opposite in direction, so that the driving rod drives the two bridge-type moving contacts and the two static contacts to realize contact or separation; according to the relay adopting the technical scheme, the terminal assembly, the contact assembly and the magnetic circuit mechanism are designed into a whole by reasonably optimizing the structural layout, two groups of control loops can be controlled in a linkage manner only by using one coil, the product size is reduced, the cost is saved, and the relay has a bistable magnetic holding function, is short in power-on time and high in response speed and is suitable for popularization and application. And a good energy-saving effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a multi-stable self-locking energy-saving relay. Background Art

[0002] A magnetic latching relay is an electronic control device that provides automatic regulation, safety protection, and circuit switching within circuits. Its normally closed or normally open state is entirely dependent on the action of a permanent magnet, and its switching is triggered by a pulsed electrical signal of a certain width. When the relay contacts need to be opened or closed, the coil is energized with a positive or negative DC pulse voltage, and the relay switches between open and closed states instantly. When the contacts are in the latching state, the coil does not need to be energized; the magnetic force of the permanent magnet alone maintains the relay's state. With the national initiative promoting energy conservation and environmental protection, magnetic latching relays are gradually replacing conventional electromagnetic relays and are widely used in power protection, automation, motion control, remote control, measurement, and communications.

[0003] With the rapid development of low-carbon economy and energy-saving and emission reduction technologies, magnetic latching relays are currently needed in charging piles. After the charging pile scans the code for payment, it will connect to the power supply and start charging. The relay is used to switch from the off-state to the powered state. To ensure safety, a double-cut-off solution is usually used, that is, two magnetic latching relays are installed on the control panel of the charging pile. The charging pile uses two magnetic latching relays to control the connection or disconnection of the live wire and the neutral wire of the 220V AC power supply respectively. The on and off actions of the two magnetic latching relays are consistent. In order to facilitate wiring, two sets of terminal blocks for connecting the live wire and the neutral wire respectively are also required on the control panel. The magnetic latching relay and the terminal blocks are welded on the control panel so that one magnetic latching relay is connected to one set of terminal blocks. It can be seen from the above that this type of charging pile requires two relays to cut off the live wire and the neutral wire at the same time. The installation takes up a lot of space, the installation connection is inconvenient, the setting cost is high, the installation efficiency is low, and the control panel will generate magnetic field interference to the relay when a large current passes through, affecting the product performance. Utility Model Content

[0004] The technical problem to be solved by the present invention is to overcome the problem that in the prior art charging pile, in order to simultaneously cut off the live wire and the neutral wire, two relays and two sets of terminal blocks need to be installed on the control board, which occupies a large installation space, is inconvenient to install and connect, and has a high installation cost.

[0005] In order to solve the above technical problems, the utility model provides a multi-stable self-locking energy-saving relay, comprising:

[0006] a housing having a mounting cavity;

[0007] The contact assembly comprises a movable contact frame movably arranged in the mounting cavity and two bridge-type movable contacts spaced apart on the movable contact frame;

[0008] The terminal assembly includes a first terminal group and a second terminal group provided on the housing, and two sets of static contacts I respectively connected to the first terminal group and the second terminal group, the first terminal group and the second terminal group cooperate with two bridge-type moving contacts through the two sets of static contacts I to form two first electrical circuits that are connected, and the moving contact frame has a first position in which the two bridge-type moving contacts are respectively brought into contact with the two sets of static contacts I, and a second position in which the two bridge-type moving contacts are respectively separated from the two sets of static contacts I;

[0009] The magnetic circuit mechanism is arranged in the mounting cavity, and includes a yoke, a bidirectional coil structure, an iron core, a driving rod and a permanent magnet, the yoke being a closed structure and forming a coil slot surrounding the bidirectional coil structure, the iron core and the driving rod being movably arranged in a guide cavity inside the bidirectional coil structure and forming a linkage cooperation, the driving rod extending out of one end of the yoke along the axial direction of the guide cavity and connected to the moving contact frame, and the moving contact frame and the iron core have the same moving direction; the iron core reciprocates under the action of two opposite magnetic field forces generated by the bidirectional coil structure, and drives the moving contact frame to reciprocate between the first position and the second position through the driving rod, the permanent magnet is arranged in the gap between the bidirectional coil structure and the yoke, the iron core maintains adsorption with one end of the yoke when the moving contact frame moves to the first position, and maintains adsorption with the other end of the yoke when the moving contact frame moves to the second position.

[0010] In the above-mentioned multi-stable self-locking energy-saving relay, the mounting cavity includes a first cavity formed between the magnetic yoke and one end of the shell, and an elastic locking member is provided between the moving contact frame and the bottom surface of the first cavity. When the moving contact frame moves to the first position, the elastic locking member is driven to one side thereof to elastically deflect, and applies a biasing force to the bridge-type moving contact to move toward the side close to the two groups of static contacts I; when the moving contact frame moves to the second position, the elastic locking member is driven to the other side thereof to elastically deflect, and applies a biasing force to the bridge-type moving contact to move away from the two groups of static contacts I.

[0011] In the above-mentioned multi-stable self-locking energy-saving relay, the elastic locking member is a self-locking spring uprightly arranged on the bottom surface of the first cavity, the dynamic contact frame is movably arranged on the upper side of the self-locking spring, the bottom of the dynamic contact frame is provided with an upper positioning protrusion, and the bottom surface of the first cavity is provided with a lower positioning protrusion, and the two ends of the self-locking spring are respectively positioned on the upper positioning protrusion and the lower positioning protrusion.

[0012] In the above-mentioned multi-stable self-locking energy-saving relay, two guide plates extending along the moving direction of the moving contact frame are provided in parallel in the first cavity, and the moving contact frame is provided with a group of limit sliders that slide in contact with the opposite inner walls of the two guide plates; or, the moving contact frame is provided with a group of limit sliding grooves that are slidably connected to the two guide plates.

[0013] In the above-mentioned multi-stable self-locking energy-saving relay, the first cavity includes a first partition groove formed by two guide plates and two second partition grooves arranged on both sides of the first partition groove. The driving rod penetrates into the first partition groove and is connected to the moving contact frame. The moving contact frame is slidably connected to the two guide plates and has two connecting ends extending to the two second partition grooves. The two connecting ends are provided with two bridge-type moving contacts accommodated in the two isolation grooves, and two groups of static contacts I are respectively arranged in the two isolation grooves opposite to the two bridge-type moving contacts.

[0014] In the above-mentioned multi-stable self-locking energy-saving relay, the terminal assembly also includes a third terminal group arranged in the shell, and two groups of static contacts II respectively connected to the third terminal group and the second terminal group. The third terminal group and the second terminal group cooperate with the two bridge-type moving contacts to form two conductive second electrical circuits; the two groups of static contacts II and the two groups of static contacts I are respectively arranged on both sides of the two bridge-type moving contacts. When the moving contact frame moves to the first position, it drives the two bridge-type moving contacts to contact the two groups of static contacts I respectively, and when it moves to the second position, it drives the two bridge-type moving contacts to contact the two groups of static contacts II respectively.

[0015] In the above-mentioned multi-stable self-locking energy-saving relay, the first terminal group includes two first terminals arranged at one end of the shell, the second terminal group includes two second terminals arranged at the other end of the shell, and the two groups of static contacts I include two first contacts respectively connected to the two first terminals, and two second contacts respectively connected to the two second terminals. The two first contacts and the two second contacts are respectively aligned and arranged on one side of the two bridge-type moving contacts.

[0016] In the above-mentioned multistable self-locking energy-saving relay, the third terminal group includes two third terminals arranged at one end of the housing, the static contact II includes two third contacts respectively connected to the two third terminals and accommodated in the first cavity, and two fourth contacts respectively connected to the two second terminals, the two third contacts and the two fourth contacts are respectively aligned one by one and arranged on the other side of the two bridge-type moving contacts; the two second contacts are connected to the two second terminals through two second conductive plates, and the two fourth contacts are respectively arranged on the two second conductive plates relative to the two second contacts.

[0017] In the above-mentioned multi-stable self-locking energy-saving relay, the driving rod is vertically connected to the moving contact frame, and an overtravel spring is provided between the driving rod and the moving contact frame. When the moving contact frame reaches the first position, the driving rod moves a certain distance relative to the moving contact frame by squeezing the overtravel spring.

[0018] In the above-mentioned multi-stable self-locking energy-saving relay, the driving rod and the moving contact frame are elastically connected through an overtravel spring. A through hole is provided in the middle of the moving contact frame for the driving rod to pass through. One end of the driving rod passing through the through hole is provided with a first limit clamp that cooperates and abuts against the back of the moving contact frame. The overtravel spring is sleeved on the driving rod, and a second limit clamp is provided on the driving rod to limit one end of the overtravel spring. The other end of the overtravel spring abuts against the front of the moving contact frame.

[0019] In the above-mentioned multi-stable self-locking energy-saving relay, the magnetic yoke includes a front magnetic yoke plate and a rear magnetic yoke plate that block the two ends of the bidirectional coil structure, and two side magnetic yoke plates relatively connected on both sides of the front magnetic yoke plate and the rear magnetic yoke plate. The front magnetic yoke plate is provided with a connecting hole suitable for the driving rod to pass through. The permanent magnet is connected to the two side magnetic yoke plates. The front magnetic yoke plate and the rear magnetic yoke plate are respectively opposite to the two ends of the iron core. The iron core is cooperatively adsorbed on the front magnetic yoke plate or the rear magnetic yoke plate under the action of the permanent magnet.

[0020] In the above-mentioned multi-stable self-locking energy-saving relay, the rear yoke plate is integrally connected to the two side yoke plates to form a U-shaped structure, and the front yoke plate is detachably arranged at the U-shaped port formed by the rear yoke plate and the two side yoke plates, and closed to form a coil slot surrounding the bidirectional coil structure.

[0021] In the above-mentioned multi-stable self-locking energy-saving relay, the bidirectional coil structure includes a skeleton and a wire coil wound on the skeleton, and a mounting bracket arranged around the side wall of the skeleton. The wire coil is divided into two coil parts on the skeleton by the mounting bracket. A guide cavity is provided in the skeleton. The mounting bracket includes two mounting grooves arranged at intervals and a wire threading groove arranged between the two mounting grooves. The two coil parts are connected by the coil wire passing through the wire threading groove. Two permanent magnets are matched in the two mounting grooves, and the magnetic poles of the two permanent magnets on the opposite sides are different.

[0022] The technical solution of the utility model has the following advantages over the prior art:

[0023] 1. In the multi-stable self-locking energy-saving relay provided by the present invention, the direction of the electromagnetic force generated by the bidirectional coil structure is determined by the direction of the current, so that the iron core is subjected to the two opposite magnetic field forces generated by the bidirectional coil structure to perform reciprocating motion, thereby driving the two bridge-type moving contacts to contact or separate with the two sets of static contacts I through the drive rod, thereby realizing the on-off operation of the L-pole circuit and the N-pole circuit. When the iron core is driven by the electromagnetic force to move toward one end of the coil structure, the iron core is attracted to one end of the yoke by the action of the permanent magnet, thereby maintaining the moving and static contacts in the closed contact state. When the iron core is driven by the opposite electromagnetic force to move toward the other end of the coil structure, the iron core is attracted to the other end of the yoke by the action of the permanent magnet, thereby maintaining the moving and static contacts in the closed contact state. The moving and static contacts are kept in the open state. The relay using this technical solution integrates the terminal assembly, contact assembly and magnetic circuit mechanism into one through the reasonable optimization layout of its own structure. The product structure is more compact. Only one coil is needed to control the two control circuits in linkage. Compared with the traditional method of using two relays, one relay coil can be reduced, which is conducive to reducing the product volume and thus saving costs. It also has a bistable magnetic holding function, short power-on time and fast response speed, so that the relay does not need electricity after completing the action, which can greatly reduce the power consumption of the coil structure and has a good energy-saving effect. It can be applied to new energy charging piles, which is also convenient for users to connect wires, thereby improving the product's performance and market competitiveness.

[0024] 2. In the multi-stable self-locking energy-saving relay provided by the present invention, when the moving contact frame moves to the first position, closed contact is achieved between the bridge moving contact and the first contact and the second contact. At this time, the iron core is attracted to one end of the yoke under the action of the permanent magnet, thereby realizing the magnetic holding effect of the relay. At the same time, since the elastic locking member 3 is pushed toward one side by the passive contact frame and elastically deflected, the elastic locking member applies a biasing force on the bridge moving contact to move toward the side close to the static contact I, thereby ensuring the stability and reliability of the contact between the moving contact and the static contact I. The advantage of this design is that when the moving contact frame is in the first position or the second position, it is subjected to the combined force of the magnetic holding force of the iron core and the biasing force of the elastic locking member, thereby playing a double self-locking role, thereby reliably locking the moving contact frame in the first position or the second position. At this time, the relay can be kept in the on or off state without electricity, and then maintain the current state to prevent false operation, thereby greatly improving the working reliability of the relay.

[0025] 3. In the multi-stable self-locking energy-saving relay provided by the present invention, an overtravel spring is provided between the driving rod and the moving contact frame. The driving rod and the contact member are elastically connected so as to be relatively movable. When the moving contact frame is moved by the pushing action of the iron core and the driving rod, when the bridge type moving contact and the static contact are closed and contacted, the driving rod continues to overtravel by squeezing the overtravel spring, thereby providing a certain contact overtravel for the contact movement of the relay contact, so that the overtravel spring is compressed and stores energy. The advantages of this design are: first, it can ensure that the moving and static contacts can still maintain a certain contact pressure after electrical wear, thereby maintaining good contact connection; secondly, when the contacts are closed, the elastic force of the overtravel spring can be used for buffering and reducing contact bounce; thirdly, when the moving and static contacts are separated, the overtravel spring can be used to enable the bridge type moving contact to obtain a certain initial kinetic energy, break the molten welding point between the contacts, increase the initial breaking speed, reduce the arcing time, and thus increase the contact breaking speed.

[0026] 4. In the multi-stable self-locking energy-saving relay provided by the present invention, two guide plates extending along the moving direction of the moving contact frame are provided in the first cavity, and the moving contact frame is correspondingly provided with a group of limit sliders that slide in contact with the opposite inner walls of the two guide plates. The cooperation between the guide plates and the limit sliders guides the movement of the moving contact frame to prevent the moving contact frame from positional displacement during the reciprocating movement, thereby ensuring the accuracy and reliability of the contact between the two bridge-type moving contacts and the two static contacts.

[0027] 5. In the multi-stable self-locking energy-saving relay provided by the present invention, the two bridge-type moving contacts are driven by the moving contact frame to move back and forth between the two groups of static contacts I and the two groups of static contacts II. When the two bridge-type moving contacts follow the moving contact frame to the first position, they contact the two groups of static contacts I, and at the same time, the two bridge-type moving contacts are separated and disconnected from the two groups of static contacts II, thereby realizing the conduction of the two first electrical circuits; it can be seen that when the two bridge-type moving contacts follow the moving contact frame to the second position, they contact the two groups of static contacts II, and at the same time, the two bridge-type moving contacts are separated and disconnected from the two groups of static contacts I, thereby realizing the conduction of the two second electrical circuits. With this structural arrangement, the switching of the first electrical circuit and the second electrical circuit can be realized during the process of driving the moving contact frame to move back and forth between the first position and the second position by the magnetic circuit mechanism, so that the relay has the functions of normally open contact and normally closed contact, so as to enhance the ability of the relay to control multiple groups of electrical circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific implementation or the description of the prior art.

[0029] Figure 1 A schematic diagram of the three-dimensional structure of the multi-stable self-locking energy-saving relay provided by the utility model;

[0030] Figure 2 This is a schematic cross-sectional view of the multi-stable self-locking energy-saving relay of the present invention;

[0031] Figure 3 This is a schematic diagram of the internal structure of the multi-stable self-locking energy-saving relay of the utility model;

[0032] Figure 4 for Figure 3 The schematic diagram of the planar structure of the multi-stable self-locking energy-saving relay shown in FIG.

[0033] Figure 5 for Figure 3 The schematic diagram of the structure of the multi-stable self-locking energy-saving relay shown in the figure is hidden behind the housing;

[0034] Figure 6 This is a schematic structural diagram of the contact assembly and terminal assembly of the present invention;

[0035] Figure 7 This is a schematic structural diagram of the contact assembly and magnetic circuit mechanism of the present invention;

[0036] Figure 8 This is a schematic structural diagram of the contact assembly of the present invention.

[0037] Explanation of the reference numerals: 1. housing; 11. first cavity; 12. guide plate; 13. lower positioning protrusion; 101. housing base; 102. housing cover; 21. first terminal; 22. second terminal; 23. third terminal; 3. self-locking spring; 4. moving contact frame; 41. upper positioning protrusion; 42. limiting slider; 5. bridge-type moving contact; 6. static contact I; 61. first contact; 62. second contact; 63. second conductive plate; 7. magnetic circuit mechanism; 71. yoke ;711, front yoke plate;712, rear yoke plate;713, side yoke plate;72, bidirectional coil structure;721, skeleton;722, wire package;73, iron core;74, driving rod;741, first limit clamp;742, second limit clamp;75, ​​permanent magnet;76, mounting bracket;77, wire threading groove;8, static contact II;81, third contact;82, fourth contact;9, overtravel spring;a, first terminal group;b, second terminal group;c, third terminal group. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0041] Example

[0042] This embodiment provides Figure 1-8 The multi-stable self-locking energy-saving relay comprises:

[0043] The housing 1 has a mounting cavity;

[0044] The contact assembly comprises a movable contact frame 4 movably arranged in the mounting cavity and two bridge-type movable contacts 5 spaced apart on the movable contact frame 4;

[0045] The terminal assembly includes a first terminal group a and a second terminal group b provided on the housing 1, and two sets of static contacts I6 respectively connected to the first terminal group a and the second terminal group b. The first terminal group a and the second terminal group b cooperate with two bridge-type movable contacts 5 through the two sets of static contacts I6 to form two conductive first electrical circuits. The two first electrical circuits are respectively an L-pole electrical circuit and an N-pole electrical circuit. The movable contact frame 4 has a first position in which the two bridge-type movable contacts 5 are respectively in contact with the two sets of static contacts I6, and a second position in which the two bridge-type movable contacts 5 are respectively separated from the two sets of static contacts I6.

[0046] The magnetic circuit mechanism 7 is arranged in the mounting cavity, which includes a yoke 71, a bidirectional coil structure 72, an iron core 73, a driving rod 74 and a permanent magnet 75. The yoke 71 is a closed structure and forms a coil slot surrounding the bidirectional coil structure 72. The iron core 73 and the driving rod 74 are movably arranged in the guide cavity inside the bidirectional coil structure 72 and form a linkage. The driving rod 74 extends out of the yoke 71 at one end along the axial direction of the guide cavity and is connected to the moving contact frame 4. The moving direction of the moving contact frame 4 and the iron core 73 is the same as that of the moving frame 4. direction is consistent; the iron core 73 reciprocates under the action of two opposite magnetic field forces generated by the bidirectional coil structure 72, and drives the moving contact frame 4 to reciprocate between the first position and the second position through the driving rod 74, and the permanent magnet 75 is arranged in the gap between the bidirectional coil structure 72 and the yoke 71, and the iron core 73 maintains adsorption with one end of the yoke 71 when the moving contact frame 4 moves to the first position, and maintains adsorption with the other end of the yoke 71 when the moving contact frame 4 moves to the second position.

[0047] It should be understood that this bidirectional coil structure 72 generates two magnetic field forces in opposite directions when a forward or reverse current signal is applied to the bidirectional coil structure 72. For example, when a forward current signal is applied to the bidirectional coil structure 72, the driving iron core 73 will be driven to move toward one end of the bidirectional coil structure 72, and then the driving rod 74 will drive the two bridge-type moving contacts 5 to contact the two sets of static contacts I6. At this time, the iron core 73 is attracted to one end of the yoke 71 under the action of the permanent magnet 75, thereby ensuring that the two first electrical circuits of the relay are in the on state; conversely, when a reverse current signal is applied to the bidirectional coil structure 72, an electromagnetic force will be generated to drive the iron core 73 to move toward the other end of the bidirectional coil structure 72, and then the driving rod 74 will drive the two bridge-type moving contacts 5 to separate from the two sets of static contacts I6. At this time, the iron core 73 moves to contact the other end of the yoke 71 and remains attracted, thereby ensuring that the two first electrical circuits of the relay are in the off state.

[0048] In the above embodiment, the direction of the electromagnetic force generated by the bidirectional coil structure 72 is determined by the direction of the current, so that the iron core 73 is subjected to the two opposite magnetic field forces generated by the bidirectional coil structure 72 to make reciprocating motion, thereby driving the two bridge-type moving contacts 5 to contact or separate with the two static contacts through the driving rod 74, thereby realizing the on-off operation of the L-pole circuit and the N-pole circuit. When the iron core 73 is driven by the electromagnetic force to move toward one end of the coil structure, the iron core 73 is retained at one end of the yoke 71 under the action of the permanent magnet 75, so that the contacts of the relay remain normally in the closed and connected state after the coil is de-energized; and when the iron core 73 is driven by the opposite electromagnetic force to move toward the other end of the coil structure, the iron core 73 is retained at the yoke under the action of the permanent magnet 75. 71 The other end of the relay is connected to the coil to keep the contacts in a separated and disconnected state after the coil is powered off; the relay adopting this technical solution integrates the terminal assembly, contact assembly and magnetic circuit mechanism into one through the reasonable optimization layout of its own structure. The product structure is more compact. Only one coil is needed to control the two control circuits in linkage. Compared with the traditional method of using two relays, one relay coil can be reduced, which is conducive to reducing the product volume and thus saving costs. It also has a bistable magnetic holding function, a short power-on time and a fast response speed, so that the relay does not need to consume electricity after completing the action, which can greatly reduce the power consumption of the coil structure and has a good energy-saving effect. It can be applied to new energy charging piles, which is also convenient for users to connect the wires, thereby improving the product's performance and market competitiveness.

[0049] As a preferred embodiment, combined with Figures 1-4As shown, the mounting cavity includes a first cavity 11 suitable for accommodating the movable contact frame 4. The first cavity 11 is formed between the magnetic yoke 71 and the incoming terminal. The iron core 73 drives the driving rod 74 to move back and forth under the action of the magnetic field force, so that the movable contact frame 4 is driven by the driving rod 7474 to move back and forth in the first cavity 11, and has a first position in which the two bridge movable contacts 5 are brought into contact with the two groups of static contacts I6, and a second position in which the two bridge movable contacts 5 are separated from the two groups of static contacts I6. It is further preferred that an elastic locking member 3 is provided between the moving contact frame 4 and the bottom surface of the first cavity 11, and the elastic locking member 3 is driven to one side thereof for elastic deflection when the moving contact frame 4 moves to the first position, and applies a biasing force to the bridge moving contact 5 to move toward the side close to the two groups of static contacts Ⅰ6; the elastic locking member 3 is driven to the other side thereof for elastic deflection when the moving contact frame 4 moves to the second position, and applies a biasing force to the bridge moving contact 5 to move toward the side away from the two groups of static contacts Ⅰ6. It can be seen that when the moving contact frame moves and switches between the first position and the second position, it drives the elastic locking member to produce two elastic deflections in opposite directions, so that the elastic biasing forces applied to the bridge moving contact in the first position and the second position are in opposite directions, and cooperates with the magnetic holding function of the magnetic circuit mechanism to play a self-locking role. With this structural arrangement, when the movable contact frame 4 moves to the first position, the bridge movable contact 5 and the static contact I6 are in closed contact. At this time, the iron core 73 is held at one end of the yoke 71 by the action of the permanent magnet 75, thereby realizing the magnetic holding effect after the relay is powered off. At the same time, due to the elastic deflection of the elastic locking member 3, a biasing force is applied to the bridge movable contact 5 to move closer to one side of the two sets of static contacts I6, so that the bridge movable contact 5 and the static contact I6 remain in the connected state. On the contrary, when the movable contact frame 4 moves to the second position, the bridge movable contact 5 and the static contact I6 are separated and disconnected. At this time, the iron core 73 is held at the other end of the yoke 71 by the action of the permanent magnet 75, thereby realizing the relay is powered off. The magnetic holding effect after electrification, at the same time, due to the elastic deflection of the elastic locking member 3, a biasing force is applied to the bridge type moving contact 5 to move away from one side of the two groups of static contacts Ⅰ6, so that the moving contact and the static contact Ⅰ6 are kept in the disconnected state. The advantage of this design is that when the moving contact frame 4 is in the first position or the second position, it is acted upon by the combined force of the magnetic holding force of the iron core 73 and the biasing force of the elastic locking member 3, which plays a double self-locking role, thereby reliably locking the moving contact frame in the first position or the second position. At this time, the relay can be kept in the on state or the off state without electricity, and then maintain the current state to prevent malfunction, thereby greatly improving the working reliability of the relay.

[0050] As a specific structural setting, the elastic locking member 3 is a self-locking spring uprightly arranged on the bottom surface of the first cavity 11, and the dynamic contact frame 4 is movably arranged on the upper side of the self-locking spring. The self-locking spring has an elastic inflection point position during the force process, and elastic deflection can occur when it crosses the elastic inflection point position. The bottom of the dynamic contact frame 4 is provided with an upper positioning protrusion 41, and the bottom surface of the first cavity 11 is provided with a lower positioning protrusion. The two ends of the self-locking spring are respectively positioned on the upper positioning protrusion and the lower positioning protrusion, and the self-locking spring is positioned and installed by the upper positioning protrusion and the lower positioning protrusion.

[0051] The following combination Figure 3-Figure 8 The specific setting methods of terminal components and contact components are described in detail:

[0052] In order to realize the control function of the relay for multiple electrical circuits, the terminal assembly also includes a third terminal group c arranged on the shell, and two groups of static contacts Ⅱ8 respectively connected to the third terminal group c and the second terminal group b. The third terminal group and the second terminal group cooperate with the two bridge-type moving contacts 5 through the two groups of static contacts Ⅱ8 to form two conductive second electrical circuits; the two groups of static contacts Ⅱ8 and the two groups of static contacts Ⅰ6 are respectively arranged on both sides of the two bridge-type moving contacts 5. When the moving contact frame 4 moves to the first position, it drives the two bridge-type moving contacts 5 to contact the two groups of static contacts Ⅰ6 respectively, and at the same time separates and disconnects the two bridge-type moving contacts 5 from the two groups of static contacts Ⅱ8, thereby realizing the conduction of the two first electrical circuits; accordingly, when the moving contact frame 4 moves to the second position, it drives the two bridge-type moving contacts 5 to contact the two groups of static contacts Ⅰ6 respectively, and at the same time separates and disconnects the two bridge-type moving contacts 5 from the two groups of static contacts Ⅱ8, thereby realizing the conduction of the two first electrical circuits. The moving contact 5 is in contact with the two groups of static contacts II 8 respectively, and at the same time, the two bridge-type moving contacts 5 are separated and disconnected from the two groups of static contacts I 6, thereby realizing the conduction of the two second electrical circuits. It can be seen that the two second terminals in this embodiment are used as common incoming terminals for the first electrical circuit and the second electrical circuit, the two first terminals are used as outgoing terminals for the first electrical circuit, and the two third terminals are used as outgoing terminals for the second electrical circuit. With this structural arrangement, the magnetic circuit mechanism 7 drives the moving contact frame 4 to move back and forth between the first position and the second position, thereby realizing the switching of the first electrical circuit and the second electrical circuit, so that the relay has the functions of normally open contact and normally closed contact, so as to enhance the ability of the relay to control multiple groups of electrical circuits.

[0053] In this embodiment, reference Figure 5-Figure 6, the first terminal group a includes two first wiring terminals 21 arranged at one end of the shell 1, the second terminal group b includes two second wiring terminals 22 arranged at the other end of the shell 1, the two groups of static contacts I6 include two first contacts 61 respectively connected to the two first wiring terminals 21, and two second contacts 62 respectively connected to the two second wiring terminals 22, the two first contacts 61 and the two second contacts 62 are respectively aligned one by one and arranged on one side of the two bridge-type moving contacts 5, that is, the first contacts 61 and the second contacts 62 are arranged in the first cavity 11 in a group of two, and the two first contacts 61 are respectively connected to the two first terminals through two first conductive plates, and the two second contacts 62 are respectively connected to the two second terminals through two second conductive plates 63; it is further preferably provided that the third terminal group c includes two third wiring terminals 23 arranged at one end of the shell 1, the static contact II8 includes two third contacts 81 respectively connected to the two third terminals and accommodated in the first cavity 11, and two fourth contacts respectively connected to the two second wiring terminals, the two third contacts 81 and the two fourth contacts 82 are respectively connected to the two second terminals. The second and fourth contacts 82 are aligned one by one and are arranged on the other side of the two bridge movable contacts 5, wherein the two fourth contacts 82 are respectively arranged on the two second conductive plates 63 relative to the two second contacts 62, that is, each second conductive plate is provided with a second contact and a fourth contact opposite to each other, so that the second contact and the fourth contact are respectively electrically connected to the second terminal through the second conductive plate, and the movable contact is in contact with the second contact and the fourth contact during the reciprocating movement. The specific matching form is that when the two bridge movable contacts 5 move to the first position, they are respectively in contact with the two first contacts 61 and the two second contacts. The two bridge movable contacts 5 are in contact with the two third contacts 81 and the two fourth contacts 82 when they move to the second position. At this time, the movable contacts are separated from the first contact and the second contact, thereby conducting and forming a second electrical circuit that passes through the second terminal, the fourth contact, the bridge movable contact, the third contact and the third terminal in sequence. How to design and implement the switching control of the first electrical circuit and the second electrical circuit.

[0054] In this embodiment, the housing 11 includes a housing base 101, a housing cover 102, and an installation cavity provided between the housing base 101 and the housing cover 102. The installation cavity includes a second cavity for installing the magnetic circuit mechanism 7. The second cavity and the first cavity are arranged adjacent to each other in the housing 1. Figure 4 and Figure 8As shown, two guide plates 12 extending in parallel along the moving direction of the movable contact frame 4 are provided within the first cavity 11. The movable contact frame 4 is correspondingly provided with a set of limit sliders 42 that slide in contact with the opposing inner sidewalls of the two guide plates 12. The cooperation between the guide plates 12 and the limit sliders 42 guides the movement of the movable contact frame 4, preventing the movable contact frame 4 from shifting during its reciprocating movement, thereby ensuring the accuracy and reliability of the contact between the two bridge-type movable contacts 5 and the two static contacts. Alternatively, the movable contact frame may be provided with a set of limit slots that slide in contact with the two guide plates. The cooperation between the limit slots and the guide plates can also guide the movement of the movable contact frame.

[0055] like Figure 2 and Figure 4 As shown, the first cavity 11 includes a first partition groove formed by two guide plates 12 and two second partition grooves arranged on both sides of the first partition groove. The driving rod 74 penetrates into the first partition groove and is connected to the driving rod 74. The moving contact frame 4 is slidably connected to the two guide plates 12 in an upright structure and has two connecting ends extending to the two second partition grooves. The two connecting ends are provided with two bridge-type moving contacts 5 accommodated in the two isolation grooves. The two groups of static contacts I 6 are respectively arranged in the two isolation grooves and opposite to the two bridge-type moving contacts 5. The first partition groove in the middle can be separated from the second partition grooves on both sides by the two guide plates to increase the creepage distance, thereby ensuring the safe electrical distance of contact between the two groups of static contacts I and the two bridge-type moving contacts.

[0056] The following combination Figure 2-Figure 6 The specific arrangement of the movable contact frame and the driving rod is described in detail:

[0057] The driving rod 74 is vertically connected to the moving contact frame 4, and an overtravel spring 9 is provided between the driving rod 74 and the moving contact frame 4. When the moving contact frame 4 moves to the first position, the driving rod 74 moves a certain distance relative to the moving contact frame 4 by squeezing the overtravel spring 9. Specifically, the driving rod 74 and the moving contact frame 4 are elastically connected through the overtravel spring 9, and the middle portion of the moving contact frame 4 is provided with a through hole for the driving rod 74 to pass through. One end of the driving rod 74 passing through the through hole is provided with a first limit clamp 741 that cooperates and abuts against the back side of the moving contact frame 4, and the overtravel spring 9 is sleeved on the driving rod 74. The driving rod 74 is provided with a second limit clamp 742 which is limited to one end of the overtravel spring 9, and the other end of the overtravel spring 9 abuts against the front side of the moving contact frame 4. The second limit clamp 742 or the second limit clamp 742 can be preferably a retaining ring or a retaining ring, respectively. With this structural arrangement, when the moving contact frame 4 is moved by the push of the iron core 73 and the drive rod 74, when the bridge type moving contact 5 is in closed contact with the static contact, the drive rod 74 continues to move over the travel by squeezing the overtravel spring 9, thereby providing a certain contact overtravel for the contact movement of the relay, so that the overtravel spring 9 is compressed and stores energy. The advantages of this design are, firstly, it can ensure that the moving and static contacts can still maintain a certain contact pressure after electrical wear, and keep the contacts in good contact; secondly, when the contacts are closed, the elastic force of the overtravel spring can be used for buffering and the contact bounce can be reduced; furthermore, when the moving and static contacts are separated, the overtravel spring can be used to enable the bridge type moving contact to obtain a certain initial kinetic energy, break the welding point between the contacts, increase the initial breaking speed, reduce the arcing time, and thus increase the contact breaking speed.

[0058] The following combination Figure 2 、 Figure 3 and Figure 7 The specific structure of the magnetic circuit mechanism is described in detail:

[0059] The magnetic yoke 71 includes a front magnetic yoke plate 711 and a rear magnetic yoke plate 712 that cover the two ends of the bidirectional coil structure 72, and two side magnetic yoke plates 713 that are relatively connected to the front magnetic yoke plate 711 and the rear magnetic yoke plate 712 on both sides. The front magnetic yoke plate 711 is provided with a connecting hole suitable for the driving rod 74 to pass through. The permanent magnet 75 is connected to the two side magnetic yoke plates 713. The front magnetic yoke plate 7 and the rear magnetic yoke plate are respectively opposite to the two ends of the iron core 73, wherein the rear magnetic yoke plate 712 is integrally connected to the two side magnetic yoke plates 713 to form a U-shaped structure. The front magnetic yoke plate 711 is detachably arranged at the U-shaped port formed by the rear magnetic yoke plate and the two side magnetic yoke plates, and is closed to form a coil slot surrounding the bidirectional coil structure 72. During installation, the bidirectional coil structure 72 can be installed into the coil slot, and then the front magnetic yoke plate 711 is installed to block one end of the bidirectional coil structure 72, which is convenient for installation. According to the bidirectional coil structure 72, the direction of the magnetic field force can be changed by changing the direction of the current. The iron core 73 is fixed on the front yoke plate 711 or the rear yoke plate 712 under the action of the permanent magnet 75, thereby realizing the magnetic holding function of the relay to keep the contacts connected or disconnected when the coil is powered off.

[0060] It is further preferred that the bidirectional coil structure 72 includes a skeleton 721 and a wire package 722 wound on the skeleton 721, and a mounting bracket 76 arranged around the side wall of the skeleton 721. The wire package 722 is separated into two coil parts on the skeleton 721 by the mounting bracket 76. A guide cavity is provided in the skeleton 721. The mounting bracket 76 includes two mounting grooves arranged at intervals and a threading groove 77 arranged between the two mounting grooves. The two coil parts are connected by the coil wire passing through the threading groove 77. Two permanent magnets 75 are matched in the two mounting grooves, and the magnetic poles of the two permanent magnets 75 on the opposite sides are different. The operating principle of the bistable relay coil in this embodiment is based on a magnetic field feedback mechanism. By changing the direction and magnitude of the current, the magnetic field can be switched between two stable states. When current flows through the bidirectional coil structure, the generated magnetic field magnetizes the magnetic core, forming a stable magnetic field state. When the current direction changes, the magnetic field direction also changes, and the magnetization direction of the magnetic core also changes accordingly. The magnetization of the magnetic core generates a reaction force on the electromagnetic coil, which causes the current to reverse direction. When the current direction completely changes, the magnetic field generated by the electromagnetic coil also completely changes, forming another stable magnetic field state.

[0061] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A multi-stable self-locking energy-saving relay, characterized in that: include: A housing (1) having a mounting cavity; The contact assembly comprises a movable contact frame (4) movably arranged in the installation cavity and two bridge-type movable contacts (5) spaced apart and arranged on the movable contact frame (4); A terminal assembly comprises a first terminal group (a) and a second terminal group (b) provided on a housing (1), and two groups of static contacts I (6) respectively connected to the first terminal group (a) and the second terminal group (b); the first terminal group (a) and the second terminal group (b) cooperate with two bridge-type moving contacts (5) to form two first electrical circuits that are connected through the two groups of static contacts I (6); the moving contact frame (4) has a first position for driving the two bridge-type moving contacts (5) to contact the two groups of static contacts I (6) respectively, and a second position for driving the two bridge-type moving contacts (5) to separate from the two groups of static contacts I (6); A magnetic circuit mechanism (7) is arranged in the installation cavity, comprising a magnetic yoke (71), a bidirectional coil structure (72), an iron core (73), a driving rod (74) and a permanent magnet (75); the magnetic yoke (71) is closed to form a coil slot surrounding the bidirectional coil structure (72); the iron core (73) and the driving rod (74) are arranged in a guide cavity inside the bidirectional coil structure (72) in a linkage manner; the driving rod (74) extends out of one end of the magnetic yoke (71) along the axial direction of the guide cavity and is connected to the movable contact frame (4); The iron core (73) is subjected to two magnetic field forces in opposite directions generated by the bidirectional coil structure (72) to perform reciprocating motion, and drives the movable contact frame (4) to move through the driving rod (74). The permanent magnet (75) is arranged in the gap between the bidirectional coil structure (72) and the magnetic yoke (71). When the movable contact frame (4) moves to the first position, the iron core (73) is held by one end of the magnetic yoke (71), and when the movable contact frame (4) moves to the second position, the iron core (73) is held by the other end of the magnetic yoke (71).

2. The multi-stable self-locking energy-saving relay according to claim 1, characterized in that: The mounting cavity comprises a first cavity (11) suitable for accommodating the movable contact frame (4); an elastic locking member (3) is provided between the movable contact frame (4) and the bottom surface of the first cavity (11); the elastic locking member (3) is driven to elastically deflect toward one side when the movable contact frame (4) moves to the first position, and applies a biasing force to the movable bridge contact (5) to move toward the side close to the two groups of static contacts I (6); the elastic locking member (3) is driven to elastically deflect toward the other side when the movable contact frame (4) moves to the second position, and applies a biasing force to the movable bridge contact (5) to move toward the side away from the two groups of static contacts I (6).

3. The multi-stable self-locking energy-saving relay according to claim 2, characterized in that: The elastic locking member (3) is a self-locking spring vertically arranged on the bottom surface of the first cavity (11); the movable contact frame (4) is movably arranged on the upper side of the self-locking spring; an upper positioning protrusion (41) is provided at the bottom of the movable contact frame (4); a lower positioning protrusion is provided on the bottom surface of the first cavity (11); and the two ends of the self-locking spring are respectively positioned on the upper positioning protrusion and the lower positioning protrusion.

4. The multi-stable self-locking energy-saving relay according to claim 2, characterized in that: Two guide plates (12) extending along the moving direction of the movable contact frame (4) are arranged in parallel in the first cavity (11), and the movable contact frame (4) is correspondingly provided with a group of limiting sliding blocks (42) slidingly contacting the opposite inner side walls of the two guide plates (12); or, the movable contact frame (4) is correspondingly provided with a group of limiting sliding grooves slidably connected to the two guide plates.

5. The multi-stable self-locking energy-saving relay according to claim 4, characterized in that: The first cavity (11) includes a first partition groove formed by two guide plates (12) and two second partition grooves arranged on both sides of the first partition groove. The driving rod (74) penetrates into the first partition groove to connect with the moving contact frame. The moving contact frame (4) is slidably connected to the two guide plates (12) and has two connecting ends extending to the two second partition grooves. The two connecting ends are provided with two bridge-type moving contacts (5) accommodated in the two isolation grooves. Two groups of static contacts I (6) are respectively arranged in the two isolation grooves and opposite to the two bridge-type moving contacts (5).

6. The multi-stable self-locking energy-saving relay according to any one of claims 1 to 5, characterized in that: The terminal assembly further comprises a third terminal group (c) arranged on the housing (1), and two groups of static contacts II (8) respectively connected to the third terminal group (c) and the second terminal group (b); the third terminal group and the second terminal group cooperate with the two bridge-type moving contacts (5) to form two conductive second electrical circuits through the two groups of static contacts II (8); the two groups of static contacts II (8) and the two groups of static contacts I (6) are respectively arranged on both sides of the two bridge-type moving contacts (5); when the moving contact frame (4) moves to the first position, it drives the two bridge-type moving contacts (5) to contact the two groups of static contacts I (6), and when it moves to the second position, it drives the two bridge-type moving contacts (5) to contact the two groups of static contacts II (8).

7. The multi-stable self-locking energy-saving relay according to claim 6, characterized in that: The first terminal group (a) includes two first wiring terminals (21) arranged at one end of the housing (1), the second terminal group (b) includes two second wiring terminals (22) arranged at the other end of the housing (1), the two groups of static contacts I (6) include two first contacts (61) respectively connected to the two first wiring terminals (21), and two second contacts (62) respectively connected to the two second wiring terminals (22), the two first contacts (61) and the two second contacts (62) are respectively aligned and arranged on one side of the two bridge-type moving contacts (5); The third terminal group (c) includes two third wiring terminals (23) arranged at one end of the housing (1), and the static contact II (8) includes two third contacts (81) respectively connected to the two third terminals and accommodated in the first cavity (11), and two fourth contacts (82) respectively connected to the two second wiring terminals (22), the two third contacts (81) and the two fourth contacts (82) respectively aligned and arranged on the other side of the two bridge-type moving contacts (5); the two second contacts (62) are connected to the two second wiring terminals through two second conductive plates (63), and the two fourth contacts (82) are respectively arranged on the two second conductive plates relative to the two second contacts.

8. The multi-stable self-locking energy-saving relay according to claim 1, characterized in that: The driving rod (74) is vertically connected to the moving contact frame (4), an overtravel spring (9) is provided between the driving rod (74) and the moving contact frame (4), and the driving rod (74) moves a certain distance relative to the moving contact frame (4) by squeezing the overtravel spring (9) when the moving contact frame (4) reaches a first position.

9. The multi-stable self-locking energy-saving relay according to claim 8, characterized in that: The driving rod (74) and the moving contact frame (4) are elastically connected via an overtravel spring (9); a through hole is provided in the middle of the moving contact frame (4) for the driving rod (74) to pass through; one end of the driving rod (74) passing through the through hole is provided with a first limiting clamp (741) that cooperates and abuts against the back of the moving contact frame (4); the overtravel spring (9) is sleeved on the driving rod (74); a second limiting clamp (742) is provided on the driving rod (74) that is limited to one end of the overtravel spring (9); and the other end of the overtravel spring (9) abuts against the front of the moving contact frame (4).

10. The multi-stable self-locking energy-saving relay according to claim 1, characterized in that: The installation cavity includes a second cavity for installing a magnetic circuit mechanism (7), the magnetic yoke (71) includes a front magnetic yoke plate (711) and a rear magnetic yoke plate (712) covering both ends of the bidirectional coil structure (72), and two side magnetic yoke plates (713) relatively connected to both sides of the front magnetic yoke plate (711) and the rear magnetic yoke plate (712), the front magnetic yoke plate (711) is provided with a connection hole suitable for the driving rod (74) to pass through, the permanent magnet (75) is connected to the two side magnetic yoke plates (713), and the front magnetic yoke plate ( The front yoke plate (711) and the rear yoke plate (712) are respectively opposite to the two ends of the iron core (73); the iron core (73) is held on the front yoke plate (711) or the rear yoke plate (712) under the action of the permanent magnet (75); the rear yoke plate (712) and the two side yoke plates (713) are integrally connected to form a U-shaped structure; the front yoke plate (711) is detachably arranged at the U-shaped port formed by the rear yoke plate (712) and the two side yoke plates (713), and is closed to form a coil slot surrounding the bidirectional coil structure (72).

11. The multi-stable self-locking energy-saving relay according to claim 1 or 10, characterized in that: The bidirectional coil structure (72) includes a skeleton (721) and a wire package (722) wound on the skeleton (721), and a mounting bracket (76) arranged around the side wall of the skeleton (721). The wire package (722) is divided into two coil parts on the skeleton (721) by the mounting bracket (76). A guide cavity is provided in the skeleton (721). The mounting bracket (76) includes two mounting grooves arranged at intervals and a threading groove (77) arranged between the two mounting grooves. The two coil parts are connected by the coil conductor passing through the threading groove (77). Two permanent magnets (75) are matched and arranged in the two mounting grooves. The magnetic poles of the two permanent magnets (75) on the opposite sides are different.

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