Self-locking motor contactor

Abstract

The self-locking type motor contactor comprises a moving contact assembly, a push rod, a static contact, a counter-force spring, a self-locking mechanism and a motor cam driving mechanism. The self-locking mechanism comprises a fixedly-arranged guide rail, a driving part and a driven part, one end of the driving part and one end of the driven part are arranged in the two opposite ends of the guide rail in a penetrating mode in a displaceable mode respectively, the driving part and the driven part can conduct synchronous linear displacement, and at the locking position of the guide rail, the driven part can rotate relative to the driving part. One end of the push rod is fixedly provided with a moving contact assembly, and the other end of the push rod abuts against one end of the driven member facing the moving contact assembly. The counter-force spring is sleeved on the periphery of the push rod in a compressed state, and the counter-force spring directly acts on the push rod or the driven piece. The motor cam driving mechanism replaces electromagnetic driving, energy consumption is low, the structure is simple, and the product size is small.

Description

Technical Field

[0001] This invention relates to the field of high voltage direct current technology, and to a self-locking motor contactor driven by a motor. Background Technology

[0002] A DC contactor is a mechanical device that uses electromagnetic principles to close and release moving and stationary iron cores, thereby connecting and disconnecting the moving and stationary contacts. Its general structure is as follows: a moving iron core is placed in the hollow position of the electromagnetic coil; a push rod is fixed on the moving iron core; a moving contact assembly is placed on the free end of the push rod; and stationary iron cores are spaced along the displacement path of the moving iron core. When the electromagnetic coil is energized, the stationary iron cores attract the moving iron cores, and the displacement of the moving iron cores causes the push rod to move, which in turn moves the moving contact assembly to contact the stationary contacts, establishing conductivity and closing the contactor. When the electromagnetic coil is de-energized, the moving contact assembly, under the action of a return spring, drives the push rod to reposition and reset the moving contact assembly, disengaging the moving and stationary contacts and opening the contactor. During the contactor's closing process, the electromagnetic coil needs to be continuously energized. If the electromagnetic coil is suddenly de-energized due to a fault, the contactor will open, causing a fault that disconnects the main circuit. Moreover, in existing DC contactor electromagnetic systems, the driving force provided by the electromagnetic system is limited within a finite volume, which restricts the setting of its reaction force and thus cannot meet the current requirements for breaking capacity, withstand breaking capacity and other performance characteristics. Summary of the Invention

[0003] The purpose of this invention is to provide a motor contactor with self-locking performance. It uses a motor cam mechanism as the drive mechanism to drive the moving contact and stationary contact to close and open. The self-locking mechanism locks the closing position of the moving contact and stationary contact during closing, ensuring the reliability of the closing operation.

[0004] To achieve the above objectives, the present invention provides a self-locking motor contactor, comprising: a moving contact assembly, a push rod, a stationary contact, a reaction spring, a self-locking mechanism, and a motor cam drive mechanism; the self-locking mechanism includes a fixedly mounted guide rail, a driving member, and a driven member, one end of which is displaceable and passes through opposite ends of the guide rail, the driving member and the driven member being capable of synchronous linear displacement, and the driven member being capable of rotation relative to the driving member at the locked position of the guide rail; one end of the push rod is fixedly provided with the moving contact assembly, and the other end of the push rod abuts against the end of the driven member facing the moving contact assembly; the reaction spring is sleeved on the outer periphery of the push rod in a compressed state, and the reaction spring acts directly on the push rod or the driven member;

[0005] The motor cam drive mechanism includes a motor and a cam mechanism, wherein the cam mechanism is configured corresponding to the driving element.

[0006] When the circuit is closed, the motor drives the cam mechanism to rotate, and the cam mechanism drives the driving member and the driven member to move synchronously in a straight line along the guide rail. After the driven member drives the push rod to close the circuit with the moving contact assembly and the stationary contact, the driven member rotates relative to the driving member to the locking position to limit the push rod. During the closing process, the reaction spring is further compressed.

[0007] When the circuit breaker is opened, the motor drives the cam mechanism to rotate, which in turn moves the driving member linearly. The driving member drives the driven member to disengage from the locking position and then rotates. The cam mechanism disengages and abuts against the self-locking mechanism. The reaction spring drives the driven member and the driving member to reset. The push rod then drives the moving contact assembly to open the circuit breaker with the stationary contact.

[0008] Preferably, the guide rail is a hollow cylindrical structure with both ends open. A plurality of protruding ribs are evenly distributed along the circumference of the inner wall of one end of the guide rail where the driving member is located, arranged along the length of the guide rail. A plurality of U-shaped slots are formed between adjacent protruding ribs. Along the length of the guide rail, the slots are of the same length and their opening ends all face the driven member. The slots arranged at intervals are unlocking slots, and the slots between adjacent unlocking slots are locking slots. In the radial direction of the guide rail, the thickness of the locking slot is less than the thickness of the protruding ribs on both sides, and the thickness of the unlocking slot is equal to the thickness of the protruding ribs on both sides. Thickness; the end of the protruding ridge and the locking groove facing the driven member is set as a bevel structure, forming a locking position at the opening end of the locking groove; the outer periphery of one end of the driving member located in the guide rail is nested in the unlocking groove and the locking groove, and the end face of the driving member facing the driven member is set as a wavy pointed tooth structure; the end face of the driven member located in the guide rail facing the driving member is set with a protruding tooth column structure, the end of the tooth column structure facing the driving member is beveled, and the bevel at the tooth column structure of the driven member and the bevel at the pointed tooth structure of the driving member do not completely mesh.

[0009] Preferably, the active component is a cylindrical structure with one open end and one closed end. The open end of the active component is located in the guide rail. The outer circumferential surface of the active component located in the guide rail is evenly distributed with limiting protrusions corresponding to the unlocking slot and the locking slot. The limiting protrusions are slidably nested in the unlocking slot and the locking slot. The end face of the open end of the active component is provided with a ring of wavy pointed tooth structure.

[0010] Preferably, the motor cam drive mechanism further includes a gear transmission mechanism. The cam mechanism includes a cam rod and a cam fixedly mounted on the cam rod. The gear transmission mechanism is connected to the motor and the cam rod respectively. The cam is positioned at a certain distance from the driving member of the self-locking mechanism. The motor drives the cam mechanism to rotate through the gear transmission mechanism. When the cam mechanism rotates, the cam drives the driving member to move linearly along the guide rail.

[0011] Preferably, the gear transmission mechanism is a bevel gear transmission mechanism, which includes a meshing driving bevel gear and a driven bevel gear. The driving bevel gear is connected to the rotating shaft of the motor, and the driven bevel gear is fixedly installed at one end of the cam rod.

[0012] Preferably, the system includes a horizontal support plate, with the push rod passing through the horizontal support plate such that both ends of the push rod are located on opposite sides of the horizontal support plate; the self-locking mechanism and the motor cam drive mechanism are located on the same side of the horizontal support plate, while the moving contact assembly and the stationary contact are located on the other side of the horizontal support plate; a mounting support plate is fixedly installed on the horizontal support plate, with the self-locking mechanism and the motor respectively mounted on the mounting support plate and located between the mounting support plate and the horizontal support plate; the cam mechanism is located on the side of the mounting support plate away from the horizontal support plate, and one end of the self-locking mechanism corresponding to the cam mechanism passes through the mounting support plate.

[0013] Preferably, the guide rail of the self-locking mechanism is fixedly mounted on the mounting support plate, one end of the driven member located outside the guide rail is located between the mounting support plate and the horizontal support plate, and one end of the driving member located outside the guide rail is located between the mounting support plate and the cam mechanism.

[0014] Preferably, the reaction spring is located between the horizontal support plate and the driven member.

[0015] Preferably, one end of the reaction spring abuts against the horizontal support plate, and the other end abuts against the end face of the driven member facing the stationary contact; or, a limiting member is provided at the end of the push rod that abuts against the driven member, one end of the reaction spring abuts against the horizontal support plate, and the other end abuts against the limiting member on the push rod; the initial state of the reaction spring is a compressed state.

[0016] Preferably, the two ends of the moving contact assembly that make conductive contact with the stationary contact are conductive springs.

[0017] This invention uses a motor cam drive mechanism and a self-locking mechanism to drive the push rod to move, thereby closing the moving contact assembly and the stationary contact, and then opens the circuit by combining a reaction spring.

[0018] The motor cam drive mechanism uses a motor, gear transmission mechanism and cam mechanism to provide mechanical driving force. The motor only needs to work during the opening and closing process. After opening and closing, the motor stops working. Compared with the existing traditional DC contactors driven by electromagnetic drive systems, it consumes less energy, has a simpler structure and smaller size.

[0019] A self-locking mechanism is adopted, which mechanically locks the moving contact assembly and stationary contact after closing, keeping them in the closed state and improving the reliability of maintaining the closed state. Automatic unlocking ensures the self-locking mechanism returns to its original position after opening. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the self-locking mechanism structure and its cooperation with the cam mechanism.

[0022] Figure 3 This is an exploded view of a self-locking mechanism.

[0023] Figure 4 This is a schematic diagram of a cam mechanism.

[0024] Figure 5 This is a schematic diagram of the guide rail structure.

[0025] Figure 6 This is a schematic diagram of the guide rail cross section AA.

[0026] Figure 7 This is a schematic diagram of the three-dimensional structure of the guide rail AA cross section.

[0027] Figure 8 Schematic diagram of the mating structure between the driving component and the guide rail.

[0028] Figure 9 This is a schematic diagram of the structure of the driven component and the driving component working together.

[0029] Figure label:

[0030] Self-locking mechanism 11, push rod 12, moving contact assembly 13, reaction spring 14, stationary contact 15, horizontal support plate 16, contact spring 17, moving contact bridge 18, support frame 19, motor 20, driving gear 21, cam mechanism 22, driven gear 23, mounting support plate 24, guide rail 110, first part 110a, second part 110b, inclined structure 110c, unlocking slot 110d, locking slot 110e, locking position 110f, driven part 111, locking limit protrusion 111a, driving part 112, limit protrusion 112a, pointed tooth structure 112b, cam rod 221, cam 222. Detailed Implementation

[0031] The self-locking motor contactor of the present invention includes: a moving contact assembly, a push rod, a stationary contact, a reaction spring, a self-locking mechanism, and a motor cam drive mechanism; the self-locking mechanism includes a fixedly mounted guide rail, a driving member, and a driven member, one end of the driving member and the driven member respectively being displaceable and passing through opposite ends of the guide rail, the driving member and the driven member being capable of synchronous linear displacement, and the driven member being capable of rotating relative to the driving member at the locked position of the guide rail; one end of the push rod is fixedly provided with the moving contact assembly, and the other end of the push rod abuts against the end of the driven member facing the moving contact assembly; the reaction spring is sleeved on the outer periphery of the push rod in a compressed state, and the reaction spring acts directly on the push rod or the driven member;

[0032] The motor-cam drive mechanism includes a motor and a cam mechanism, with the cam mechanism corresponding to the driving component.

[0033] When the circuit is closed, the motor drives the cam mechanism to rotate. The cam mechanism drives the driving and driven components to move synchronously in a linear motion along the guide rail. After the driven component drives the push rod to close the circuit with the stationary contact, the driven component rotates relative to the driving component to the locking position to limit the push rod. During the closing process, the reaction spring is further compressed.

[0034] When the circuit breaker is opened, the motor drives the cam mechanism to rotate, which in turn causes the driving element to move linearly. The driving element then drives the driven element to disengage from the locking position and rotate after unlocking. The cam mechanism disengages from the self-locking mechanism, and the reaction spring drives the driven element and the driving element to reset. The push rod then drives the moving contact assembly to open the circuit breaker with the stationary contact.

[0035] The following describes preferred embodiments in detail with reference to the accompanying drawings. The directional terms used are for reference only and do not constitute a limitation on the technical solution of this invention.

[0036] See Figures 1 to 9 The self-locking motor contactor of the present invention is a high-voltage DC contactor, which mainly includes a housing (not shown), a motor cam drive mechanism, a self-locking mechanism 11, a push rod 12, a moving contact assembly 13, a reaction spring 14, and a stationary contact 15.

[0037] The housing is divided into upper and lower chambers by a horizontal support plate 16. The moving contact assembly 13 and the stationary contact 15 are located in the upper chamber of the housing, while the motor cam drive mechanism and the self-locking mechanism 11 are located in the lower chamber of the housing to prevent the electric arc generated when the moving contact assembly 13 and the stationary contact 15 open and close from entering the cavity where the motor cam drive mechanism is located. The self-locking mechanism 11 abuts against one end of the push rod 12, and the other end of the push rod 12 passes through the horizontal support plate 16 and is fixedly connected to the moving contact assembly 13. The stationary contact 15 is fixedly mounted on the housing, with the end that makes conductive contact with the moving contact bridge located in the upper chamber of the housing. A reaction spring 14 is fitted around the push rod 12 at the position between the self-locking mechanism 11 and the horizontal support plate 16, which causes the push rod 12 to abut against the self-locking mechanism 11. The moving contact assembly 13 includes a contact spring 17, a lower magnetic conductor, a moving contact bridge 18, and an upper magnetic conductor arranged sequentially from bottom to top on a mounting base mounted on a push rod 13. A support frame 19 restricts the contact spring 17, the lower magnetic conductor, the moving contact bridge 18, and the upper magnetic conductor to the mounting base. The moving contact bridge 18 is retractable relative to the mounting base under the action of the contact spring 18. The two ends of the moving contact bridge 18 that contact the stationary contact 15 are configured as conductive spring structures. When the conductive springs of the moving contact bridge contact the stationary contact, the conductive springs can undergo a certain elastic deformation to buffer the impact force brought to the stationary contact by the moving contact bridge assembly. The moving contact assembly 13 is prior art, and the moving contact assembly structure of existing DC contactors is used as the moving contact assembly 13 of this invention.

[0038] The motor cam drive mechanism includes a motor 20, a gear transmission mechanism, and a cam mechanism 22. The gear transmission mechanism includes a meshing drive gear 21 and a driven gear 23. A mounting support plate 24 is fixedly connected below the horizontal support plate 16. The mounting support plate can be L-shaped, U-shaped, or a similar structure, or it can be a structure that can be fixedly connected to the horizontal support plate and used to support or mount internal components such as motors and guide rails. The motor 20 and the self-locking mechanism 11 are spaced apart on the mounting support plate 24, so that the motor 20 and the self-locking mechanism 11 are located between the horizontal support plate 16 and the mounting support plate 24. The shaft of the motor 20 passes through the mounting support plate 24, and the end of the shaft not connected to the motor 20 is located below the mounting support plate 24. A drive gear 21, which is a bevel gear, is fixedly mounted at the end of the shaft of the motor 20. The cam mechanism 22 is horizontally arranged below the mounting support plate. The cam mechanism 22 includes a cam rod 221, on which a cam 222 is fixedly mounted. A driven gear 23, which is a bevel gear, is fixedly mounted on the end of the cam rod 221 of the cam mechanism 22 facing the driving gear 21 of the motor 20. The driven gear 23 at the end of the cam mechanism 22 meshes with the driving gear 21 on the shaft of the motor 20. The cam 222 of the cam mechanism 22 is located below the self-locking mechanism 11. The motor 20 drives the cam mechanism 22 to rotate through the meshing driving and driven gears. The motor is perpendicular to the cam mechanism through the meshing driving and driven bevel gears, which maximizes the use of space.

[0039] The self-locking mechanism 11 includes a guide rail 110 and a driven member 111 and a driving member 112 respectively passing through both ends of the guide rail 110. One end of the driven member 111 and the driving member 112 are respectively inserted into the guide rail 110 and abut against each other within the guide rail. Both the driven member 111 and the driving member 112 can make linear displacement relative to the guide rail, and the driven member 111 can rotate relative to the guide rail 110 and the driving member 112. The driven member 111 abuts against the push rod 12 under the action of the reaction spring 14.

[0040] The guide rail 110 is a cylindrical structure open at both ends, fixedly mounted on a support. Reinforcing ribs are provided on the outer circumference of the guide rail and on the support to connect the support and the guide rail, thereby improving the installation strength of the guide rail. The support of the guide rail 110 is fixedly mounted on the mounting support plate 24. The upper and lower ends of the guide rail 110 are located on the upper and lower sides of the mounting support plate 24, respectively. The guide rail 110 is fixedly mounted relative to the horizontal support plate 16. The lower end of the driven member 111 passes through the upper end of the guide rail 110, and the upper end of the driving member 112 passes through the lower end of the guide rail 110.

[0041] The hollow portion penetrating both ends of the guide rail 110 is a hollow cylindrical structure. Several protruding ribs 110a are spaced circumferentially on the inner wall of one end of the guide rail 110 through which the driving member 112 passes. The length of each protruding rib 110a is along the length of the guide rail 110, with the end of the protruding rib 110a facing the driven member 111 located within the guide rail 110, maintaining a certain distance from the end face of the guide rail 110 through which the driven member 111 passes. A U-shaped groove is formed between two adjacent protruding ribs 110a. In the radial direction of the guide rail 110, the thicknesses of adjacent grooves are different: the groove with a thickness equal to the thickness of the adjacent two protruding ribs is the unlocking groove 110b, and the groove with a thickness less than the thickness of the adjacent two protruding ribs is the locking groove 110c. The end faces of the protruding ridge 110 and the locking groove 110c facing the follower 111 are set as inclined surfaces that are inclined in the same direction and at the same angle, so that the two sides of the opening ends of the unlocking groove 110b and the locking groove 110c are not level, and a locking position 110d is formed at the opening end of the locking groove 110c.

[0042] The active component 112 is a hollow cylindrical structure with one end closed and the other open. The open end of the active component 112 faces the driven component 111 and passes through the guide rail 110, while the closed end of the active component 112 is located outside the guide rail 110. Near the outer circumferential surface of the open end of the active component 112, corresponding limiting protrusions 112a are provided along the circumferential direction for the unlocking and locking slots of the guide rail, respectively. The protrusion thickness of the limiting protrusions 112a is the same as the thickness of their corresponding slots. The limiting protrusions 112a of the active component 112 are respectively engaged in the corresponding unlocking slot 110b and locking slot 110c. Since the slots are U-shaped, the bottoms of the unlocking and locking slots along the length of the guide rail 110 both limit the limiting protrusions 112a of the active component 112, preventing the active component 112 from dislodging from the guide rail 110. The annular end face of the driving member 112 facing the open end of the driven member 111 is provided with a tooth-shaped structure 112b, and the peaks and troughs of the tooth-shaped structure are all inclined surfaces, so that the peaks form a pointed structure.

[0043] The driven member 111 is a cylindrical structure that matches the inner wall of the guide rail 110. At the end of the driven member 111 that passes through the guide rail 110 and faces the drive member 112, a plurality of protruding toothed structures 111a are provided on the end face of the drive member. The toothed structures 111a of the driven member 111 have inclined surfaces facing the drive member. The inclined surfaces of the toothed structures 111a of the driven member 111 do not fully mesh with the inclined surfaces of the toothed structures 112b of the drive member 112, but mesh with the inclined surfaces of the protruding ribs 110a in the guide rail 110 facing the driven member and at the locking position. When the contactor is in the open state and the self-locking mechanism is in the unlocked state, the toothed structures 111a of the driven member 111 are located in the unlocking slot 110b and abut against the toothed structures 112b of the drive member 112.

[0044] The cam 222 on the cam mechanism 22 is located directly below the driving member 112. When the cam mechanism 22 rotates, the cam 222 can abut against the driving member 112, causing the driving member to move towards the driven member.

[0045] The end of the push rod 12 without the moving contact assembly passes through the horizontal support plate 16 and abuts against the end face of the driven member 111 facing the moving contact assembly. Preferably, the diameter of the end face of the driven member 111 abutting against the push rod 12 is larger than the diameter of the contact area between the push rod 12 and the driven member 111, ensuring better contact and preventing the push rod from easily dislodging from the driven member surface when the driven member rotates. The contact between the push rod 12 and the driven member 111 can be point-to-surface contact or surface-to-surface contact, with the contact surface being a plane. Alternatively, a groove or boss can be provided on the end face of the driven member 111 facing the push rod 12, with the push rod 12 abutting against the groove or boss. A groove for abutment can be provided on the boss, with the contact surface being a plane. The following description uses one specific structure with a groove on the end face of the driven member as an example. A support groove can be provided on the end face of the driven member 111 facing the moving contact assembly. A support base protruding from the outer periphery of the push rod 12 can be provided on one end of the push rod 12 that abuts against the driven member 111. When a support base is provided, the support base of the push rod 12 is located in the support groove of the driven member 111, which defines the horizontal position of the end of the push rod 12 with the support base. The driven member 111 can drive the push rod 12 to linear displacement and can rotate relative to the push rod 12. A reaction spring 14 is sleeved on the outer periphery of the push rod 12 between the support base of the push rod 12 and the horizontal support plate 16. One end of the reaction spring 14 abuts against the horizontal support plate 16, and the other end abuts against the support base. The reaction spring 14 is always in a compressed state. Through the reaction spring 14, the push rod 12 is always in contact with the driven member 111 of the self-locking mechanism 11. In other embodiments, the push rod 12 can directly abut against one end of the driven member 111, and one end of the reaction spring 14 abuts against the horizontal support plate, while the other end directly abuts against the driven member 111. Alternatively, a limiting member can be provided at the end of the push rod 12 that abuts against the driven member 111, with the reaction spring 14 located between the limiting member of the push rod and the horizontal support plate. The limiting member of the push rod abuts against the driven member 111.

[0046] Working principle:

[0047] With the contactor in the open state as the initial state, the moving contact bridge assembly is away from the stationary contact and is in the open position. The limiting protrusion 112a on the driving member of the self-locking mechanism abuts against the bottom of the unlocking slot 110b and the locking slot 110c. The toothed structure 111a of the driven member 111 is located in the unlocking slot 110b and abuts against the pointed structure of the toothed structure 112b at the open end of the driving member 112. The cam 222 of the cam mechanism remains in a non-contact state with the driving member 112.

[0048] When the contactor closes, the motor drives the drive gear 21 to rotate, which in turn drives the driven gear 23 to rotate. The driven gear 23 then drives the cam mechanism 22 to rotate. The rotation of the cam mechanism 22 causes the cam 222 to contact the end of the drive member 112. As the cam mechanism 22 continues to rotate, the cam 222 drives the drive member 112 and the driven member 111 to move along the unlocking slot 110b towards the driven member 111. During the displacement of the drive member 112, the pointed tooth structure 112b at the open end of the drive member 112 contacts the toothed column structure 111a of the driven member 111. As the driven member 111 moves, it drives the push rod 12 to move the moving contact assembly towards the stationary contact. When the conductive spring of the moving contact bridge 18 makes conductive contact with the stationary contact 15 and the conductive spring undergoes elastic deformation, the drive member 112 drives the toothed column structure 111a of the driven member 111 to move towards the unlocking slot towards the driven member. At the critical point of the opening end, the toothed structure 111a of the driven member 111 loses the position limitation of the unlocking slot 110b. Under the action of the pointed tooth structure of the driving member 112, the driven member 111 rotates, and the toothed structure 111a of the driven member 111 rotates along the inclined surface of the protrusion on one side of the unlocking slot to the locking position 110d. Through the locking position 110d of the guide rail 110, the position of the driven member 111 is locked to achieve self-locking, ensuring that the moving contact bridge and the stationary contact are closed. Then the motor stops rotating. When the driven member 111 is in the locking position, the driving member 112 falls back to the bottom of the unlocking slot. The linear displacement distance driven by the cam 222 to the driving member 112 is less than the maximum linear displacement distance that the cam 222 can drive to the driving member 112. That is, when unlocking, the cam 222 rotates again, which can drive the driving member 112 to push the driven member 111 from the locking position to the critical point at the inclined surface structure of the protrusion on one side of the unlocking slot. When the contactor is closed, the motor does not work and does not consume power.

[0049] When the circuit breaker is opened, the motor rotates and drives the cam mechanism 22 to rotate. The cam 222 first drives the driving member 112 to move towards the driven member 111, driving the driven member 111 to move linearly and disengage from the locked position. The driven member 111 rotates and enters the unlocking slot 110b along the inclined surface of the protruding end face on one side of the unlocking slot. At this time, the protrusion of the cam passes over the end face of the driving member 112 and moves away from the driving member 112, causing the driving member 112 to lose the driving force of the cam 222. Under the elastic force of the reaction spring 14, the push rod 12 pushes the driven member 111 to move towards the driving member 112 along the unlocking slot 110b. At the same time as the driven member 111 moves, the driving member moves along the unlocking slot until the limiting protrusion of the driving member stops against the bottom of the unlocking slot, and the contactor opens. Whether it is during the closing process or the opening process, the deformation of the conductive springs at both ends of the moving contact bridge that are in contact with the stationary contact is elastic deformation. Due to the elasticity of the conductive springs, the impact on the stationary contact will be buffered, and the stationary contact will not be damaged during this process.

[0050] The motor cam drive mechanism of this invention only rotates and consumes electrical energy during the closing and opening processes. During continuous closing and opening states, the motor does not operate and consumes no electrical energy. Therefore, it is more energy-efficient than the DC contactor in an electromagnetic drive system. Furthermore, the coordinated design of the motor, bevel gear meshing transmission, and cam mechanism fully utilizes space, improves space utilization, and reduces product size.

Claims

1. A self-holding motor contactor, characterized by, The utility model relates to a circuit breaker, including: Movable contact assembly, push rod, static contact, counterforce spring, self locking mechanism, motor cam drive mechanism, the self locking mechanism includes fixedly arranged guide rail, driving piece and driven piece, one end of driving piece and driven piece respectively with the displaceable mode is arranged in the opposite two ends of guide rail, driving piece and driven piece can synchronous linear displacement, in the locking position of guide rail, driven piece can rotate relative to driving piece, one end of push rod is fixedly provided with movable contact assembly, the other end of push rod and the one end of driven piece towards movable contact assembly abuts, counterforce spring is set in the outer periphery of push rod in compression state, counterforce spring acts on push rod or driven piece directly, The motor cam drive mechanism includes motor and cam mechanism, the cam mechanism is arranged to driving piece, When closing, the motor drives the cam mechanism to rotate, the cam mechanism drives driving piece and driven piece to move linearly along the guide rail synchronously, the driven piece drives the push rod to take movable contact assembly and static contact to close, and then the driven piece rotates relative to the driving piece to the locking position to limit the push rod, in the process of closing, the counterforce spring is further compressed, When opening, the motor drives the cam mechanism to rotate, and the driving piece linearly moves, the driving piece drives the driven piece to rotate after unlocking from the locking position, the cam mechanism is separated from the self locking mechanism, the counterforce spring drives the driven piece and the driving piece to reset, the push rod takes movable contact assembly and static contact to open.

2. The self-holding motor contactor according to claim 1, characterized in that, The guide rail is a hollow cylindrical structure with through ends, a plurality of convex edges arranged along the length direction of the guide rail are uniformly and interval distributed in the circumferential direction of the inner wall of one end of the guide rail, a plurality of U-shaped clamping grooves are formed between two adjacent convex edges, the length of the clamping grooves is the same and the opening ends are arranged towards the direction of the driven piece, the clamping grooves arranged at intervals are unlocking clamping grooves, the clamping groove between two adjacent unlocking clamping grooves is a locking clamping groove, in the radial direction of the guide rail, the thickness of the locking clamping groove is less than the thickness of the convex edges on both sides, the thickness of the unlocking clamping groove is the thickness of the convex edges on both sides, the end of the convex edges and the locking clamping groove towards the direction of the driven piece is arranged as an inclined surface structure, the opening end of the locking clamping groove forms a locking position, the outer periphery of one end of the driving piece in the guide rail is nested in the unlocking clamping groove and the locking clamping groove, and the end face of one end of the driving piece towards the direction of the driven piece is arranged as a wave-shaped sharp tooth structure, the end face of one end of the driven piece in the guide rail towards the direction of the driving piece is arranged as a tooth column structure with a convex end face, the end of the tooth column structure towards the driving piece is an inclined surface, and the inclined surface of the tooth column structure of the driven piece is not completely engaged with the inclined surface of the sharp tooth structure of the driving piece.

3. The self-holding motor contactor according to claim 2, characterized in that, The driving member is a cylindrical structure with one end open and the other end closed. The open end of the driving member is located in the guide rail. The outer circumferential surface of the driving member in the guide rail is uniformly distributed with limiting protrusions corresponding to the unlocking clamping grooves and the locking clamping grooves. The limiting protrusions are slidably nested in the unlocking clamping grooves and the locking clamping grooves. The end face of the open end of the driving member is provided with a ring of wavy teeth.

4. The self-holding motor contactor according to claim 1, characterized in that, The motor cam driving mechanism further comprises a gear transmission mechanism. The cam mechanism comprises a cam rod and a cam fixedly arranged on the cam rod. The gear transmission mechanism is connected with the motor and the cam rod respectively. The cam is arranged at a distance from the driving member of the self-locking mechanism. The motor drives the cam mechanism to rotate through the gear transmission mechanism. When the cam mechanism rotates, the cam drives the driving member to linearly displace along the guide rail.

5. The self-holding motor contactor according to claim 4, characterized in that, The gear transmission mechanism is a bevel gear transmission mechanism, which comprises a driving bevel gear and a driven bevel gear in engagement. The driving bevel gear is connected with the rotating shaft of the motor. The driven bevel gear is fixedly installed at one end of the cam rod.

6. The self-holding motor contactor according to any one of claims 1 to 5, characterized in that, The horizontal support plate is provided. The push rod passes through the horizontal support plate, and the two ends of the push rod are located on the two sides of the horizontal support plate respectively. The self-locking mechanism and the motor cam driving mechanism are located on the same side of the horizontal support plate. The movable contact assembly and the static contact are located on the other side of the horizontal support plate. The mounting support plate is fixedly installed on the horizontal support plate. The self-locking mechanism and the motor are installed on the mounting support plate and located between the mounting support plate and the horizontal support plate. The cam mechanism is located on the side of the mounting support plate away from the horizontal support plate. One end of the self-locking mechanism corresponding to the cam mechanism passes through the mounting support plate.

7. The self-holding motor contactor according to claim 6, characterized in that, The guide rail of the self-locking mechanism is fixedly installed on the mounting support plate. One end of the driven member located outside the guide rail is located between the mounting support plate and the horizontal support plate. One end of the driving member located outside the guide rail is located between the mounting support plate and the cam mechanism.

8. The self-holding motor contactor according to claim 6, characterized in that, The counterforce spring is located between the horizontal support plate and the driven member.

9. The self-holding motor contactor according to claim 8, characterized in that, One end of the counterforce spring abuts against the horizontal support plate, and the other end abuts against the end face of the driven member facing the static contact. Alternatively, a limiting member is arranged at the end of the push rod abutting against the driven member. One end of the counterforce spring abuts against the horizontal support plate, and the other end abuts against the limiting member on the push rod. The initial state of the counterforce spring is a compressed state.

10. The self-latching motor contactor of claim 1, wherein, The two ends of the movable contact assembly in conductive contact with the static contact are conductive spring pieces.

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