Contact mechanism and contact unit

Abstract

A contact mechanism and a contact unit. The contact mechanism comprises a movable contact assembly and a stationary contact set, wherein the movable contact assembly comprises a contact support and a movable contact bridge, the contact support driving the movable contact bridge to move in the direction closer to or away from the stationary contact set. The movable contact assembly further comprises two elastic devices, wherein a connector is provided in the middle of the movable contact bridge, and a first end and second end of each elastic device are rotatably connected to the contact support and the connector, respectively, such that the two elastic devices cooperate to switch between a first equilibrium position, a dead point position and a second equilibrium position. During normal opening and closing, the two elastic devices remain in the first equilibrium position at an included angle and apply pressure to the movable contact bridge; when a short-circuit fault occurs, the movable contact bridge is repelled by electrodynamic force and drives the second ends of the two elastic devices to move relative to the contact support, such that the two elastic devices switch and remain in the dead point position or the second equilibrium position at an included angle thus limiting the movable contact bridge. The elastic devices of the present invention improve the reliability of the contact mechanism.

Description

Contact mechanism and contact unit

[0001] This application claims priority to Chinese patent application number 2024100436758 and filing date January 11, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present invention relates to the field of low-voltage electrical appliances, and in particular to a contact mechanism and a contact unit. Background Art

[0003] A switch device is a device that controls the on and off of a circuit. In existing products, the contact mechanism of the switch device includes a moving contact assembly and a static contact group that cooperate with each other, wherein the moving contact assembly includes a contact support and a moving contact bridge, and the moving contact bridge is driven by the contact support to move, thereby achieving contact and separation with the static contact group. When a short circuit fault occurs, the moving contact bridge will be repelled by the action of electric force, causing the moving contact bridge to move relative to the contact support in a direction away from the static contact group. Due to the lack of a limiting structure in the existing contact mechanism, the moving contact bridge is easily moved toward the static contact group due to the reduction of electric force, causing the moving contact bridge and the static contact group to be connected again, seriously affecting the safety of product use and the product life.

[0004] Summary of the Invention

[0005] The object of the present invention is to overcome at least one drawback of the prior art and to provide a contact mechanism and a contact unit with a simple structure and high reliability.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a contact mechanism, comprising a movable contact assembly and a stationary contact group that cooperate with each other, wherein the movable contact assembly comprises a contact support and a movable contact bridge, wherein the movable contact bridge is driven by the contact support to move toward or away from the stationary contact group, and wherein the movable contact assembly further comprises two elastic devices, wherein a connecting piece is provided at the middle portion of the movable contact bridge, and wherein the first end and the second end of each elastic device are rotatably connected to the contact support and the connecting piece respectively, so that the two elastic devices cooperate to switch between a first equilibrium position, a dead point position, and a second equilibrium position.

[0008] During normal opening and closing, the two elastic devices remain in the first equilibrium position with an included angle and apply pressure to the moving contact bridge;

[0009] When a short circuit occurs, the moving contact bridge is repelled by the electric force and drives the second ends of the two elastic devices to move relative to the contact support. The two elastic devices switch and remain in the dead point position or the second equilibrium position at an angle to limit the moving contact bridge.

[0010] Preferably, in the first equilibrium position, the distance between the second end of each elastic device and the moving contact bridge is smaller than the distance between the first end of each elastic device and the moving contact bridge; in the dead point position, the connecting line between the first end and the second end of each elastic device is parallel to the plane connecting the two ends of the moving contact bridge;

[0011] In the second equilibrium position, the distance between the second end of each elastic device and the moving contact bridge is greater than the distance between the first end of each elastic device and the moving contact bridge.

[0012] Preferably, when a short circuit fault occurs, the two elastic devices pass the dead point position and remain in the second equilibrium position.

[0013] Preferably, the two elastic devices are symmetrically arranged.

[0014] Preferably, an assembly cavity is provided at one end of the contact support, the movable contact bridge is arranged through the assembly cavity, the first end of each elastic device is rotatably connected to the assembly cavity, and when the movable contact bridge is repelled by electric force, the movable contact bridge moves in the assembly cavity in a direction perpendicular to the plane connected between the two ends of the movable contact bridge.

[0015] Preferably, the inner side wall of the assembly cavity away from the moving contact bridge serves as a stop wall, and the stop wall cooperates with the connecting piece to stop the relative movement of the moving contact bridge and the contact support.

[0016] Preferably, each of the elastic devices includes a first connecting plate, a second connecting plate, a guide rod and a spring, the first connecting plate and the second connecting plate are respectively rotatably connected to the contact support and the connecting piece, one end of the guide rod is connected to the first connecting plate, and the other end of the guide rod is slidingly matched with the second connecting plate, and the spring is sleeved on the outside of the guide rod and elastically abuts between the first connecting plate and the second connecting plate.

[0017] Preferably, the axial length of the guide rod is smaller than the axial length of the spring in a normal state.

[0018] Preferably, the contact support includes a linkage part and a bearing part, the linkage part is connected to one end of the bearing part, the hollow area of ​​the bearing part serves as an assembly cavity, the mounting port of the assembly cavity is located on opposite sides of the bearing part, and the two ends of the moving contact bridge extend from the mounting port to the outside of the contact support respectively.

[0019] Preferably, the assembly cavity is T-shaped as a whole, and the assembly cavity includes a transverse cavity and a longitudinal cavity that are interconnected. The connecting piece moves along the central axis of the longitudinal cavity. The first end of each elastic device is rotatably connected to the end of the transverse cavity away from the longitudinal cavity, and the inner side wall of the transverse cavity facing the dynamic contact bridge serves as a stop wall.

[0020] Preferably, the static contact group includes two static contacts arranged at intervals, the two moving contact portions of the moving contact bridge are respectively spaced opposite to the static contact portions of the two static contacts, and the end of each moving contact portion is bent away from the static contact to form a limiting portion.

[0021] The present invention further provides a contact unit, comprising a unit housing, characterized in that the contact mechanism as described above is arranged in the unit housing.

[0022] Furthermore, the moving contact assembly is slidably arranged in the unit housing, and at least one limit platform is provided in the unit housing. The limit platform is spaced apart from the static contact group, and the moving contact bridge moves between the limit platform and the static contact, and the limit portion of the moving contact bridge abuts against the limit platform.

[0023] Furthermore, a linkage groove is provided in the middle of the unit housing, and the linkage portion of the moving contact assembly slides through the linkage groove, and the linkage portion protrudes and extends outside the unit housing.

[0024] Furthermore, each contact unit includes two static contacts, and the first end of each static contact is provided with a static contact part. The two ends of the moving contact bridge serve as moving contact parts respectively. Each contact unit also includes an arc extinguishing system, and the arc extinguishing system includes an arc extinguishing chamber and a magnetizing component. The moving contact part and the static contact part contact or separate at the arc entrance of the arc extinguishing chamber, and the magnetizing component is cooperatively arranged on both sides of the static contact part and the moving contact part.

[0025] The contact mechanism and contact unit of the present invention have two elastic devices that can apply pressure to the moving contact bridge when in the first equilibrium position. When a short-circuit fault occurs, the moving contact bridge can switch the elastic devices and maintain them in the second equilibrium position or dead point position under the action of electric force, which can quickly disconnect the short-circuit current and greatly improve the current limiting capacity of the contact mechanism. The moving contact bridge can be limited in the second equilibrium position or dead point position to prevent the moving contact bridge from contacting the static contact group again due to the reduction of electric force, causing welding between the contacts.

[0026] In addition, the assembly cavity provides a moving space for the moving contact bridge and an assembly space for the elastic device and the connector, thereby avoiding interference from external structures and ensuring the stability of the fit.

[0027] In addition, the elastic device has a simple composition and has the advantages of low cost, stable structure and high reliability.

[0028] In addition, a limit platform is provided inside the unit housing, and the moving contact bridge moves between the limit platform and the static contact. When opening the switch, the limit portion of the moving contact bridge can abut against the limit platform, so that the moving contact bridge moves within a controllable range.

[0029] In addition, the linkage portion slides out of the unit housing from the linkage groove, making it convenient to link the moving contact assembly from the outside of the contact unit to avoid affecting the inside of the contact unit.

[0030] In addition, magnetizing parts are provided at the moving contact part and the static contact part, which is conducive to introducing the arc generated when the contact mechanism is disconnected into the arc extinguishing chamber, thereby improving the arc striking and arc extinguishing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic structural diagram of a switch device according to the present invention;

[0032] FIG2 is a schematic diagram of the internal structure of the contact unit of the present invention;

[0033] FIG3 is a cross-sectional view of a contact unit in the present invention;

[0034] FIG4 is a schematic structural diagram of the contact mechanism of the present invention;

[0035] FIG5 is a schematic structural diagram of the movable contact assembly of the present invention;

[0036] FIG6 is a schematic structural diagram of the elastic device in the present invention at a first equilibrium position;

[0037] FIG7 is a schematic structural diagram of the elastic device in the present invention at a second equilibrium position;

[0038] FIG8 is a cross-sectional view of a contact support in the present invention;

[0039] FIG9 is a schematic structural diagram of the movable contact bridge, the connecting member and the spring device in the present invention;

[0040] Reference numerals:

[0041] 1-housing, 1u-upper cover, 1b-base, b-operation key, b1-closing key, b2-opening key, t-terminal, 2-contact unit, 2h-unit housing, 20h-linkage slot, 21h-arc extinguishing channel, 22h-first limit slot, 23h-limiting platform, 2g-yoke mounting slot, 20-contact mechanism, 21-moving contact assembly, 200-contact support, 200b-linkage part, 2010b-connecting hole, 200c-bearing part, 2001c-bearing part top wall, 2002c-bearing part bottom wall, 2003c-bearing part front wall, 2004c-bearing part rear wall, 200d-longitudinal cavity, 200e-transverse cavity, 2001e-connection area, 2002e-stop wall, 201-moving contact bridge, 2011-moving contact part, 2012-moving contact point, 2013-limiting part, 202-elastic device, 2021-spring, 2022-first connecting plate, 2023-second connecting plate, 2024-guide rod, o1-hinge point of the first connecting plate, o2-hinge point of the second connecting plate, 203-connecting piece 203, 22-static contact group, 220-static contact, 2200-static contact plate, 22001-first plate, 22002-second plate, 22003-connecting section, 22004-static contact part, 22005-connecting part, 2201-static contact point, 23-magnetizing part, 24-arc extinguishing chamber, 26-arc isolation plate, 27-arc striking plate, 28-current detection device. DETAILED DESCRIPTION

[0042] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the contact mechanism and contact unit of the present invention. The contact mechanism and contact unit of the present invention are not limited to the description of the following embodiments.

[0043] As shown in Figure 1, the switching device includes a shell 1, in which a control system, an operating system and at least one contact unit 2 are arranged. The operating system can be a mechanical operating system or an electromagnetic operating system 3 driven by the control system. The contact mechanism 20 of each contact unit 2 includes a moving contact assembly 21 and a static contact group 22 that cooperate with each other. The operating system is driven and connected to the moving contact assembly 21 in at least one contact unit 2, and the moving contact assemblies 21 of two adjacent contact units 2 are linked to achieve synchronous opening and closing. The driving method of the control system, the electromagnetic operating system 3 and the moving contact assembly 21 can adopt the existing technology.

[0044] Specifically, as shown in Figures 2 and 4, the moving contact assembly 21 includes a contact support 200 and a moving contact bridge 201 that are driven to cooperate. The contact support 200 is driven to cooperate with the moving contact bridge 201. The static contact group 22 includes two static contacts 220 arranged at intervals. The two ends of the moving contact bridge 201 serve as moving contact parts 2011 respectively. Each moving contact part 2011 is spaced apart from the static contact part 22004 of a static contact 220. During normal opening and closing, the contact support 200 drives the moving contact bridge 201 to move toward or away from the static contact group 22, and each moving contact part 2011 is in contact with or separated from a static contact part 22004.

[0045] For the convenience of description, the moving direction of the moving contact assembly 21 is taken as the first direction, that is, the direction of the Y axis in Figure 2. The moving contact assembly 21 and the static contact group 22 are spaced apart and opposite to each other in the first direction. The other two directions perpendicular to the first direction are taken as the second direction and the third direction. In Figure 2, the directions of the X axis and the Z axis are taken as the second direction and the third direction.

[0046] The improvement of the present application is that, as shown in Figure 3, the moving contact assembly 21 also includes two elastic devices 202, and a connecting piece 203 is provided in the middle of the moving contact bridge 201. The first end and the second end of each elastic device 202 are rotatably connected to the contact support 200 and the connecting piece 203 respectively, so that the two elastic devices 202 cooperate to switch between the first equilibrium position, the dead point position and the second equilibrium position. During normal opening and closing, the two elastic devices 202 remain in the first equilibrium position at an angle and apply pressure to the moving contact bridge 201; when a short circuit fault occurs, the moving contact bridge 201 is repelled by the electric force and drives the second ends of the two elastic devices 202 to move relative to the contact support 200. The two elastic devices 202 switch and remain in the dead point position or the second equilibrium position at an angle to limit the moving contact bridge 201.

[0047] In this way, the two elastic devices 202 can apply pressure to the moving contact bridge 201 when they are in the first equilibrium position. When a short circuit fault occurs, the moving contact bridge 201 can switch the elastic device 202 and maintain it in the second equilibrium position or dead point position under the action of electric force, which can quickly disconnect the short-circuit current and greatly improve the current limiting capacity of the contact mechanism 20. The moving contact bridge 201 can be limited in the second equilibrium position or dead point position to prevent the moving contact bridge 201 from contacting the static contact group 22 again due to the reduction of electric force, causing welding between the contacts.

[0048] Preferably, as shown in Figures 3, 6, 7 and 9, the two elastic devices 202 are symmetrically arranged to ensure that the moving contact bridge 201 is evenly stressed and the moving trajectory of the moving contact bridge 201 is prevented from being offset; further, the second ends of the two elastic devices 202 are elastically squeezed against each other, that is, at the first equilibrium position, the dead point position and the second equilibrium position, the second ends of the two elastic devices 202 remain in contact, and the elastic deformation of each elastic device 202 at the first equilibrium position and the second equilibrium position is smaller than the elastic deformation at the dead point position. Of course, the second ends of the two elastic devices 202 may also not cooperate with each other, and each elastic device 202 undergoes elastic deformation under the interaction between the connecting member 203 and the contact support 200. At this time, it is difficult for the two elastic devices 202 to maintain a stable state at the dead point position.

[0049] As shown in FIG6 , in the first equilibrium position, the distance between the second end of each elastic device 202 and the moving contact bridge 201 is smaller than the distance between the first end of the elastic device 202 and the moving contact bridge 201. Each elastic device 202 is connected obliquely between the connecting member 203 and the contact support 200. The elastic deformation direction of the elastic device 202 forms an angle with the plane P (see FIG9 ) connected between the two ends of the moving contact bridge 201, which can provide pressure to the moving contact bridge 201. At this time, the two elastic devices 202 are in an angled relationship. shaped angle state; as shown in Figure 7, when in the dead point position, the connecting line between the first end and the second end of each elastic device 202 is parallel to the plane P connected between the two ends of the moving contact bridge 201, and the elastic deformation direction of each elastic device 202 is parallel to the plane P connected between the two ends of the moving contact bridge 201, so that the two elastic devices 202 are tightly pressed against the limit on the same straight line and cannot apply pressure to the moving contact bridge 201. The two elastic devices 202 at the dead point position are in a "-" shaped structure, and the dead point position is between the first equilibrium position and the second equilibrium position; but when the two elastic devices 202 are in the dead point position, if the second ends of the two elastic devices 202 There is no mutual contact between the ends of the elastic device 202, and its stability is poor. As the moving contact bridge 201 is repelled, the two elastic devices 202 will switch over the dead point position and remain in the second equilibrium position; in the second equilibrium position, the distance between the second end of each elastic device 202 and the moving contact bridge 201 is greater than the distance between the first end of the elastic device 202 and the moving contact bridge 201. Each elastic device 202 is obliquely connected between the connecting piece 203 and the contact support 200. The elastic deformation direction of the elastic device 202 forms an angle with the plane P connected between the two ends of the moving contact bridge 201, which can provide pressure for the moving contact bridge 201. At this time, the two elastic devices 202 are in an angled relationship. The angle state of the shape.

[0050] Specifically, as shown in Figure 9, each elastic device 202 includes a first connecting plate 2022, a second connecting plate 2023, a guide rod 2024 and a spring 2021, wherein the first connecting plate 2022 and the second connecting plate 2023 are rotatably connected to the contact support 200 and the connecting member 203 respectively, one end of the guide rod 2024 is fixedly connected to the first connecting plate 2022, and the other end of the guide rod 2024 can slide through the second connecting plate 2023. Of course, it is also possible that one end of the guide rod 2024 is fixedly connected to the second connecting plate 2023, and the other end slides through the first connecting plate 2022, the spring 2021 is sleeved on the outside of the guide rod 2024 and elastically abuts between the first connecting plate 2022 and the second connecting plate 2023 respectively, and the axial length of the spring 2021 in the normal state is greater than the axial length of the guide rod 2024, that is, the spring 2021 is in a compressed state between the first connecting plate 2022 and the second connecting plate 2023.

[0051] Furthermore, as shown in Figures 5-8, the contact support 200 is provided with an assembly cavity, and the moving contact bridge 201 is arranged through the assembly cavity, so that the two moving contact parts 2011 of the moving contact bridge 201 extend outside the assembly cavity for cooperating with the two static contacts 220. The first end of each elastic device 202 is rotatably connected to the assembly cavity. When the moving contact bridge 201 is repelled by electric force, the moving contact bridge 201 moves in the assembly cavity along a direction perpendicular to the plane P connected between the two ends of the moving contact bridge 201. The assembly cavity provides assembly and movement space for the moving contact bridge 201 and the elastic device 202, thereby improving the cooperation stability of the elastic device 202, the moving contact bridge 201 and the contact support 200. When applied to a switching device, it can save the internal space of the switching device and avoid mutual interference with other components of the switching device.

[0052] Furthermore, the inner wall of the assembly cavity away from the moving contact bridge 201 serves as a stop wall 2002e. When the moving contact bridge 201 is repelled by electric force, the stop wall 2002e cooperates with the connecting piece 203 to stop the relative movement of the moving contact bridge 201 and the contact support 200, which is conducive to switching the elastic device 202 to the second equilibrium position, thereby ensuring the safety and stability of the contact mechanism 20.

[0053] A specific structure of a switch device is provided in conjunction with Figures 1-9.

[0054] As shown in Figure 1, the switch device includes a shell 1, and the opposite ends of the shell 1 serve as wiring terminals respectively. Each wiring terminal is provided with at least one wiring slot, and each wiring slot is correspondingly provided with an operating hole and a wiring hole to facilitate operation and wiring. The connecting line between the two wiring terminals is parallel to the second direction. The side of the shell 1 located between the two wiring terminals serves as the operating end. The operating end is provided with an operating key b, and the pressing direction of the operating key b is parallel to the first direction. In Figure 1, the operating end protrudes from the middle of the shell 1, so that the shell 1 as a whole presents a convex shape. Preferably, the shell 1 includes an upper cover 1u and a base 1b that cover each other. The upper cover 1u covers the base 1b in the first direction, and the operating end corresponds to the middle position of the upper cover 1u. The operating key b is a button, which can be divided into a closing key b1 and an opening key b2. In the figure, the closing key b1 and the opening key b2 are arranged at intervals in the third direction.

[0055] A control system, an electromagnetic operating system 3 and at least one contact unit 2 are arranged in the shell 1, wherein the control system includes a control circuit board, and the operation key b and the electromagnetic operating system 3 are respectively connected to the control circuit board. By pressing the operation key b, the controller arranged on the control circuit board can be triggered to make the electromagnetic operating system 3 move according to the control signal output by the controller; in this embodiment, the number of contact units 2 is multiple, and two adjacent contact units 2 are arranged side by side in the third direction. The electromagnetic operating system 3 is driven and connected to the contact mechanism 20 of at least one of the contact units 2. Correspondingly, the opening and closing direction of the contact mechanism 20 of each contact unit 2 is also along the first direction.

[0056] The electromagnetic operating system 3 includes an electromagnetic drive mechanism 3m, each contact unit 2 includes a pair of terminal blocks t spaced apart along the second direction, a contact mechanism 20 is connected between the pair of terminal blocks t, the contact mechanism 20 includes a moving contact assembly 21 and a static contact group 22 spaced apart and opposite to each other in the first direction, the electromagnetic drive mechanism 3m is directly or indirectly linked to the moving contact assembly 21 of at least one contact unit 2, and the moving contact assemblies 21 of two adjacent contact units 2 are linked, that is, a transmission rod 3c is connected between two adjacent moving contacts, the electromagnetic operating system 3 is driven and connected to one of the moving contact assemblies 21, and the remaining moving contact assemblies 21 move synchronously under the linkage action of the transmission rod 3c. Preferably, the linkage assembly is linked to the transmission rod 3c, so that all moving contact assemblies 21 are synchronously driven by the electromagnetic operating system 3 to ensure consistency of movement.

[0057] In this embodiment, the electromagnetic drive mechanism 3m includes a magnetic yoke, a coil assembly 32 and a moving assembly, wherein the magnetic yoke is arranged around the outside of the coil assembly 32, the coil assembly 32 includes a coil frame and a coil wound around the outside of the coil frame, and the moving assembly includes a moving iron core 31 and a static iron core 33, wherein the static iron core 33 and the moving iron core 31 are respectively arranged at opposite ends of the coil frame, and each coil frame is arranged in the outer shell 1. The coil assembly 32 drives the moving iron core 31 according to the control signal, and the moving iron core 31 is driven and connected to the moving contact assembly 21 of at least one contact unit 2 through a linkage assembly. The electromagnetic drive mechanism adopts the existing technology.

[0058] The electromagnetic operating system may also include a linkage component, through which the electromagnetic drive mechanism is driven and connected to the moving contact component 21, wherein the linkage component includes a linkage rod 3r and / or a linkage part 3b, and the driving coordination between the electromagnetic drive mechanism and the moving contact component 21, as well as the driving coordination between the electromagnetic drive mechanism and the moving contact component 21 through the linkage component are existing technologies.

[0059] A specific structure of a contact unit 2 is provided in conjunction with Figures 2-9.

[0060] The contact unit 2 includes a pair of terminals t, a contact mechanism 20 and two arc extinguishing systems, wherein the pair of terminals t are spaced apart in the second direction, the contact mechanism 20 is connected between the pair of terminals t for controlling the connection and disconnection of the main line of each contact unit 2, and each arc extinguishing system is arranged between the contact mechanism 20 and a terminal t. Each arc extinguishing system includes an arc extinguishing chamber 24, the arc entrance of the arc extinguishing chamber 24 is connected to the contact mechanism 20, and an exhaust hole for discharging exhaust gas is provided at one end of the arc extinguishing chamber 24 away from the arc entrance, wherein the terminal t and the arc extinguishing chamber 24 can adopt existing technology.

[0061] As shown in Figure 2-4, the contact mechanism 20 includes a moving contact assembly 21 and a static contact group 22 that are spaced opposite to each other in a first direction. The static contact group 22 includes two static contacts 220. In the second direction, the two static contacts 220 are spaced apart between two wiring terminals t. The first end of each static contact 220 is provided with a static contact portion 22004. The middle part of the static contact 220 extends along a side adjacent to the arc extinguishing chamber 24, so that the second end of the static contact 220 is connected to a wiring terminal t. The moving contact assembly 21 includes a contact support 200 and a moving contact bridge 201 connected to the contact support 200. A protruding linkage portion 200b is provided on the side of the contact support 200 facing away from the moving contact bridge 201. The two adjacent linkage portions 200b are linked and connected by a transmission rod 3c. The two ends of the moving contact bridge 201 serve as moving contact portions 2011 respectively. Each moving contact portion 2011 contacts or separates from a corresponding static contact portion 22004 at the arc entrance of the arc extinguishing chamber 24.

[0062] Preferably, as shown in Figures 3, 6, 7 and 9, the moving contact assembly 21 also includes two elastic devices 202, and a connecting piece 203 is provided in the middle of the moving contact bridge 201. The connecting piece 203 and the moving contact bridge 201 are fixed together by riveting or welding. The first end and the second end of each elastic device 202 are respectively linked to the contact support 200 and the connecting piece 203. Preferably, the two elastic devices 202 are symmetrically arranged, thereby ensuring that the moving contact bridge 201 is evenly stressed and avoiding deviation of the moving trajectory of the moving contact bridge 201.

[0063] As shown in Figures 3 and 6, during normal opening and closing, the two elastic devices 202 remain in the first equilibrium position at an angle. At this time, the two elastic devices 202 cooperate to form shaped angle structure, each elastic device 202 can apply pressure to the moving contact bridge 201, and in the closed state, the pressure applied by each elastic device 202 can be used as the contact pressure between the moving contact part 2011 and the static contact part 22004; as shown in Figure 7, when a short circuit fault occurs, the electric force generated between the moving contact part 2011 and the static contact part 22004 repels the moving contact bridge 201, and the moving contact bridge 201 moves in the first direction away from the static contact 220. The movement of the moving contact bridge 201 can drive the second ends of the two elastic devices 202 to move relative to the contact support 200, so that the two elastic devices 202 switch and remain in the second equilibrium position after passing the dead point position. At this time, the two elastic devices 202 are also set at an angle to limit the moving contact bridge 201 from moving in the direction close to the static contact 220, avoiding contact with the static contact group 22 again due to the reduction of the electric force, thereby causing welding between the contacts. At the second equilibrium position, the two elastic devices 202 cooperate to form shaped angle structure.

[0064] Preferably, as shown in FIG3-8, one end of the contact support 200 serves as a linkage portion 200b, and at least one connecting hole 2010b is provided on the linkage portion 200b. A transmission rod 3c passes through each connecting hole 2010b to connect two adjacent linkage portions 200b together. An assembly cavity is provided at the other end of the contact support 200, and the movable contact bridge 201 is provided through the assembly cavity, and the two movable contact portions 2011 extend out of the assembly cavity respectively. The first end of each elastic device 202 is rotatably connected to the assembly cavity, and the assembly cavity has a certain space in a direction perpendicular to the movable contact bridge 201. When the movable contact bridge 201 is repelled by electric force, The moving contact bridge 201 can move in the assembly cavity along a direction perpendicular to the plane P connected between the two ends of the moving contact bridge 201. In this embodiment, the moving contact bridge 201 moves in the assembly cavity along a first direction; further, one end of the assembly cavity extends in a direction away from the moving contact bridge 201 to provide a moving space for the connector 203. When the moving contact bridge 201 moves relative to the contact support 200, the connector 203 moves in the assembly cavity, and the side wall of the assembly cavity at the first end of each elastic device 202 is rotatably connected, so that the elastic device 202 and the connector 203 are in the internal space of the contact support 200, avoiding interference from external structures, thereby ensuring the stability of the fit.

[0065] In conjunction with Figures 5-9, a specific structure of a moving contact assembly 21 is provided. The moving contact assembly 21 includes a contact support 200, a connector 203, a moving contact bridge 201 and two elastic devices 202. As shown in Figures 5 and 8, the contact support 200 includes an integrally formed linkage portion 200b and a bearing portion 200c. One end of the linkage portion 200b is provided with two side-by-side connection holes 2010b, and the other end of the linkage portion 200b is connected to one end of the bearing portion 200c. Preferably, the bearing portion 200c is a T-shaped hollow body. After the linkage portion 200b is connected to the bearing portion 200c, the contact support 200 is cross-shaped as a whole, wherein the top of the bearing portion The walls 2001c are respectively connected to both sides of the other end of the linkage part 200b, and the end wall of the load-bearing part 200c away from one end of the linkage part 200b serves as the bottom wall 2002c of the load-bearing part. Two pairs of side walls are connected between the bottom wall 2002c of the load-bearing part and the top wall 2001c of the load-bearing part, one pair of side walls are the front wall 2003c of the load-bearing part and the rear wall 2004c of the load-bearing part, and the other pair of side walls are the left wall of the load-bearing part and the right wall of the load-bearing part. The internal hollow area of ​​the load-bearing part 200c serves as an assembly cavity, and the left wall and the right wall of the load-bearing part are opened as an installation port connected to the assembly cavity. The two ends of the moving contact bridge 201 extend from the installation port to the outside of the contact support 200 respectively.

[0066] In Figure 8, the assembly cavity is T-shaped as a whole, and the assembly cavity includes a transverse cavity 200e and a longitudinal cavity 200d that are interconnected. The central axis of the longitudinal cavity 200d is parallel to the first direction, and the central axis of the transverse cavity 200e is parallel to the second direction. The two ends of the transverse cavity 200e away from the longitudinal cavity 200d serve as connection areas 2001e respectively, and the connecting member 203 moves along the central axis of the longitudinal cavity 200d. The first end of each elastic device 202 is rotatably connected to the end of the transverse cavity 200e away from the longitudinal cavity 200d, that is, it is connected to the connection area 2001e. The inner side wall of the transverse cavity 200e facing the dynamic contact bridge 201 serves as a stop wall 2002e. When the connecting member 203 contacts the stop wall 2002e, the stop wall 2002e prevents the connecting member 203 from continuing to move, so that the two elastic devices 202 switch to the second equilibrium position.

[0067] As shown in Figures 5-9, the moving contact bridge 201 is in the shape of a straight plate as a whole. The middle part of the moving contact bridge 201 is arranged in the assembly cavity. The two ends of the moving contact bridge 201 serve as moving contact parts 2011 and extend out of the assembly cavity from two installation ports. In this embodiment, the plane P connected between the two ends of the moving contact bridge 201 can also be understood as the area connected between the two moving contact parts 2011. When the moving contact bridge 201 is set on the contact support 200, the plane P is perpendicular to the first direction. A moving contact point 2012 is provided on the side of each moving contact part 2011 facing the static contact 220, and the end of each moving contact part 2011 is facing away from the static contact 220. 0 is bent in the direction of the switch to form a limit portion 2013. When the moving contact assembly 21 is in the opening position, the limit portion 2013 can cooperate with the limit platform 23h in the switch device to limit the movement range of the moving contact bridge 201. In addition, when the moving contact bridge 201 is pushed open, the limit portion 2013 cooperates with the limit platform 23h. When the contact support 200 is driven to move toward the opening position, the limit portion 2013 abuts against the limit platform 23h, thereby limiting the second end of the connector 203 and the elastic device 202, so that the contact support 200 drives the first end of the elastic device 202 to move, thereby switching the elastic device 202 to the first equilibrium position.

[0068] The connecting member 203 is arranged in the middle of the moving contact bridge 201. In Figure 9, the connecting member 203 is a U-shaped structure as a whole. The connecting member 203 includes two spaced-apart supporting walls, and two side-by-side shafts are arranged between the two supporting walls. The connecting line between the two shafts is parallel to the plane P connected between the two ends of the moving contact bridge 201, and each shaft is used to be rotatably connected to the second end of an elastic device 202.

[0069] As shown in Figures 3, 6, 7 and 9, each elastic device 202 includes a first connecting plate 2022, a second connecting plate 2023, a guide rod 2024 and a spring 2021. The first connecting plate 2022 and the second connecting plate 2023 are rotatably connected to the contact support 200 and the connecting member 203 respectively. One end of the guide rod 2024 is connected to the first connecting plate 2022, and the other end of the guide rod 2024 is slidably matched with the second connecting plate 2023. The spring 2021 is sleeved on the outer wall of the guide rod 2024 and abuts between the first connecting plate 2022 and the second connecting plate 2023 respectively. The axial length of the spring 2021 in the normal state is greater than the axial length of the guide rod 2024, so that the spring 2021 is always in a compressed state between the first connecting plate 2022 and the second connecting plate 2023.

[0070] In this embodiment, the first connecting plate 2022 is a U-shaped structure, and the first connecting plate 2022 includes two first connecting arms set at intervals, and a first intermediate plate is connected between the two first connecting arms. The two first connecting arms are rotatably connected in the assembly cavity through an axle rod, that is, they are connected to the end of the transverse cavity 200e away from the longitudinal cavity 200d, and one end of the guide rod 2024 is connected to the first intermediate plate; the second connecting plate 2023 is also a U-shaped structure, and the second connecting plate 2023 includes two second connecting arms set at intervals, and the two second connecting arms are respectively rotatably connected to an axle rod of the connecting member 203, and a second intermediate plate is connected between the two second connecting arms. The other end of the guide rod 2024 slides through the middle of the second intermediate plate, and the end of the guide rod 2024 is provided with an anti-slip portion to prevent the guide rod 2024 from falling off the second intermediate plate.

[0071] As shown in FIG6 , when the elastic device 202 is in the first equilibrium position, the central axis of the spring 2021 forms an angle with the plane P connected between the two ends of the moving contact bridge 201, so that the distance from the second end of the elastic device 202 to the moving contact bridge 201 is smaller than the distance from the first end of the elastic device 202 to the moving contact bridge 201, and the line between the hinge point o1 of the first connecting plate 2022 and the hinge point o2 of the second connecting plate 2023 forms an angle with the plane P connected between the two ends of the moving contact bridge 201. The spring 2021 is in a first compressed state, and the elastic deformation direction of the spring 2021 forms an angle with the plane P connected between the two ends of the moving contact bridge 201, so that the elastic device 202 can apply pressure to the moving contact bridge 201, and the pressure direction is the direction close to the static contact 220, which is the direction indicated by the arrow in FIG6 ;

[0072] As shown in FIG7 , when a short circuit fault occurs, the moving contact bridge 201 is repelled by the electric force and moves relative to the contact support 200 in the direction away from the static contact 220, that is, in the direction indicated by the arrow in FIG7 , and the second end of each elastic device 202 also moves accordingly. When moving to the dead point position, the line between the hinge point o1 of the first connecting plate 2022 and the hinge point o2 of the second connecting plate 2023 is parallel to the plane P connecting the two ends of the moving contact bridge 201. At the dead point position, the spring 2021 is in the second compressed state. After passing the dead point position, the two elastic devices 202 continue to move toward the second equilibrium position and finally remain in the second equilibrium position. When the side of the connector 203 away from the moving contact bridge 201 contacts the stop wall 2002e, the moving contact bridge 201 stops moving. At this time, the distance from the second end of each elastic device 202 to the moving contact bridge 201 is greater than the distance from the first end of the elastic device 202 to the moving contact bridge 201. The line connecting the hinge point o1 of 2022 and the hinge point o2 of the second connecting plate 2023 again forms an angle with the plane P connecting the two ends of the moving contact bridge 201, but under the action of the stop wall 2002e, the angle formed by the line connecting the hinge point o1 and the hinge point o2 and the plane P connecting the two ends of the moving contact bridge 201 may be smaller, and each spring 2021 is in a third compressed state. Compared with the first equilibrium position, the distance between the first connecting plate 2022 and the second connecting plate 2023 is reduced, and one end of the guide rod 2024 slides with the middle part of the second intermediate plate. The spring 2021 is further compressed by the first connecting plate 2022 and the second connecting plate 2023. At this time, the elastic force exerted by the two springs 2021 is relatively large. After the electric force decreases or disappears, the elastic device 202 maintained in the second equilibrium position can limit the moving contact bridge 201 from moving in the direction close to the static contact 220, thereby preventing the moving contact bridge 201 and the static contact 220 from being connected again.

[0073] It should be noted that the stop wall 2002e may not be provided in the assembly cavity, and the elastic device 202 switched to the second equilibrium position may limit the further movement of the movable contact bridge 201.

[0074] As shown in Figure 2-4, the first end of the static contact 220 is spaced opposite to the moving contact assembly 21, and the distal end of the first end is folded back and extended to form a static contact portion 22004. The static contact portion 22004 is spaced opposite to the moving contact assembly 21, and a static contact point 2201 is provided on the side of the static contact portion 22004 facing the moving contact assembly 21. A gap is left between the static contact portion 22004 facing away from the static contact point 2201 and the first end of the static contact 220. The middle portion of the static contact 220 extends along one side of the arc extinguishing chamber 24, so that the second end of the static contact 220 is connected to a terminal t.

[0075] In this embodiment, the static contact 220 includes a static contact plate 2200, and the static contact plate 2200 includes a first plate 22001 and a second plate 22002 that are parallel to each other and extend in opposite directions. In FIG3, the first plate 22001 and the second plate 22002 extend in the second direction away from and close to the terminal t, respectively, wherein the first plate 22001 and the second plate 22002 serve as the first end and the second end of the static contact 220, respectively, and there is a connecting connection between the first plate 22001 and the second plate 22002. In section 22003, the end of the first plate 22001 extends and folds back to form a static contact portion 22004 spaced apart from the first plate 22001, with a gap left between the static contact portion 22004 and the first plate 22001. A static contact point 2201 is provided on the side of the static contact portion 22004 facing the dynamic contact portion 2011. The static contact point 2201 cooperates with the dynamic contact point 2012 of the dynamic contact portion 2011, and the end of the static contact portion 22004 is deflected toward the direction close to the first plate 22001 to form a connecting portion 22005.

[0076] In this embodiment, as shown in Figure 2, each contact unit 2 also includes a unit shell 2h, and the contact mechanism 20, the arc extinguishing system and the terminal t are arranged in the unit shell 2h, which is conducive to forming a modular structure. Preferably, the contact mechanism 20 is arranged in the unit shell 2h, and the terminal t is arranged on the outside of the two ends of the unit shell 2h and is correspondingly arranged in the wiring slot of the shell 1. The unit shell 2h is provided with a threading hole at the position corresponding to the terminal t, and the second end of the static contact 220 is connected to the terminal t through the threading hole; the arc extinguishing system is correspondingly arranged in the unit shell 2h between the contact mechanism 20 and a terminal t, and unit exhaust ports connected to the arc extinguishing system are respectively provided at both ends of the unit shell 2h to facilitate the discharge of exhaust gas. The unit exhaust port corresponds to the wiring slot of the shell 1, which can both discharge exhaust gas and reduce the number of holes opened on the shell 1.

[0077] A linkage groove 20h is provided in the middle of the unit housing 2h, and the central axis of the linkage groove 20h is parallel to the first direction. The moving contact assembly 21 is linked to the linkage assembly through the linkage groove 20h, and the linkage part 200b slides through the linkage groove 20h. The linkage part 200b protrudes and extends outside the unit housing 2h, and is used to be linked and connected with the electromagnetic operating system 3 and the adjacent moving contact assembly 21 respectively. The linkage from the outside of the contact unit 2 can avoid affecting the inside. The electromagnetic operating system 3 is driven and connected to the transmission rod 3c connected between the two linkage parts 200b, and can synchronously drive all the moving contact assemblies 21, thereby ensuring the consistency of the actions of multiple moving contact assemblies 21.

[0078] A limit platform 23h is further provided inside the unit shell 2h corresponding to the linkage groove 20h. The limit platform 23h is spaced apart from the static contact group 22, so that the moving contact bridge 201 moves between the static contact group 22 and the limit platform 23h. When in the opening position, the limit portion 2013 abuts against the limit platform 23h, thereby limiting the movement range of the moving contact bridge 201. When the moving contact bridge 201 is repelled, the limit portion 2013 of the moving contact bridge 201 abuts against the limit platform 23h, so that the elastic device 202 can be reset when the contact support 200 moves to the opening position.

[0079] In this embodiment, each arc extinguishing system includes an arc extinguishing chamber 24, an arc striking plate 27 and a magnetizing component 23, wherein the arc extinguishing chamber 24 and the arc striking plate 27 can adopt the existing structure, each dynamic contact part 2011 and the static contact part 22004 correspond to the arc entrance port of the arc extinguishing chamber 24, one end of the arc striking plate 27 is connected to the end of the static contact part 22004, that is, one end of the arc striking plate 27 is connected to the connecting part 22005, and the other end of the arc striking plate 27 extends along one side of the arc entrance port into the arc extinguishing chamber 24, and the end of the arc extinguishing chamber 24 away from the arc entrance port is provided with an exhaust hole for discharging exhaust gas; the magnetizing component 23 is arranged on both sides of the static contact part 22004 and the dynamic contact part 2011, thereby enhancing the magnetic field at the dynamic contact part 2011 and the static contact part 22004, which is conducive to introducing the arc generated when the contact mechanism 20 is disconnected into the arc extinguishing chamber 24, thereby improving the arc striking and arc extinguishing efficiency. An arc isolation plate 26 is provided between the magnetizing component 23 and the contact mechanism 20 . The arc isolation plate 26 is provided between the magnetizing component 23 and the contact mechanism 20 to prevent the arc from contacting the magnetizing component 23 .

[0080] In addition, in this embodiment, an arc extinguishing channel 21h is provided inside the unit shell 2h, and the arc extinguishing channel 21h is connected between the unit exhaust port and the exhaust hole. In Figure 2, the arc extinguishing channel 21h is curved and extended, which is conducive to buffering and cooling the exhaust gas discharged from the arc extinguishing chamber 24.

[0081] Each contact unit 2 also includes a current detection device 28 and a connecting circuit board. The current detection device 28 is connected to the contact mechanism 20. The connection terminal of the current detection device 28 extends outside the unit housing 2h and is connected to the connecting circuit, which is connected to the control circuit board of the control system through the connecting circuit board.

[0082] It should be noted that, in the description of the present invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are conventionally placed in use. They are intended solely for ease of description and do not necessarily require the devices or components referred to to have a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0083] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. Contact mechanism, comprising a moving contact assembly (21) and a stationary contact group (22) that cooperate with each other. The moving contact assembly (21) includes a contact support (200) and a moving contact bridge (201). The contact support (200) drives the moving contact bridge (201) to move in a direction close to or away from the stationary contact group (22), and is characterized in that: The moving contact assembly (21) further includes two elastic devices (202). A connecting member (203) is provided in the middle of the moving contact bridge (201). The first end and the second end of each elastic device (202) are respectively rotatably connected to the contact support (200) and the connecting member (203), so that the two elastic devices (202) cooperate to switch between a first equilibrium position, a dead point position, and a second equilibrium position. During normal opening and closing, the two elastic devices (202) are held at the first equilibrium position with an included angle and apply pressure to the moving contact bridge (201). When a short-circuit fault occurs, the moving contact bridge (201) is repelled by the electrodynamic force and drives the second ends of the two elastic devices (202) to move relative to the contact support (200). The two elastic devices (202) switch and are held at the dead point position or the second equilibrium position with an included angle to limit the moving contact bridge (201).

2. The contact mechanism according to claim 1, characterized in that: At the first equilibrium position, the distance between the second end of each elastic device (202) and the moving contact bridge (201) is less than the distance between the first end of each elastic device (202) and the moving contact bridge (201); at the dead point position, the connecting line between the first end and the second end of each elastic device (202) is parallel to the plane (P) connecting the two ends of the moving contact bridge (201). At the second equilibrium position, the distance between the second end of each elastic device (202) and the moving contact bridge (201) is greater than the distance between the first end of each elastic device (202) and the moving contact bridge (201).

3. The contact mechanism according to claim 2, characterized in that: When a short-circuit fault occurs, the two elastic devices (202) cross the dead point position and are held at the second equilibrium position.

4. The contact mechanism according to claim 1, characterized in that: The two elastic devices (202) are symmetrically arranged.

5. The contact mechanism according to claim 1, characterized in that: One end of the contact support (200) is provided with an assembly cavity. The moving contact bridge (201) is disposed through the assembly cavity. The first end of each elastic device (202) is rotatably connected to the assembly cavity. When the moving contact bridge (201) is repelled by the electrodynamic force, the moving contact bridge (201) moves in the assembly cavity along a direction perpendicular to the plane (P) connecting the two ends of the moving contact bridge (201).

6. The contact mechanism according to claim 5, characterized in that: The inner side wall of the assembly cavity away from the moving contact bridge (201) serves as a stop wall (2002e). The stop wall (2002e) cooperates with the connecting member (203) to stop the relative movement between the moving contact bridge (201) and the contact support (200).

7. The contact mechanism according to claim 1, characterized in that: Each elastic device (202) includes a first connecting plate (2022), a second connecting plate (2023), a guide rod (2024), and a spring (2021). The first connecting plate (2022) and the second connecting plate (2023) are respectively rotatably connected to the contact support (200) and the connecting member (203). One end of the guide rod (2024) is connected to the first connecting plate (2022), and the other end of the guide rod (2024) is slidably engaged with the second connecting plate (2023). The spring (2021) is sleeved outside the guide rod (2024) and is elastically abutted between the first connecting plate (2022) and the second connecting plate (2023).

8. The contact mechanism according to claim 7, wherein: The axial length of the guide rod (2024) is less than the axial length of the spring (2021) in the normal state.

9. The contact mechanism according to claim 1, characterized in that: The contact support (200) includes a linkage part (200b) and a bearing part (200c). The linkage part (200b) is connected to one end of the bearing part (200c). The hollow area of the bearing part (200c) serves as an assembly cavity. The installation openings of the assembly cavity are located on opposite sides of the bearing part (200c). Both ends of the moving contact bridge (201) extend from the installation openings to the outside of the contact support (200).

10. The contact mechanism according to claim 9, characterized in that: The overall shape of the assembly cavity is T-shaped. The assembly cavity includes a transverse cavity (200e) and a longitudinal cavity (200d) that communicate with each other. The connecting piece (203) moves along the central axis of the longitudinal cavity (200d). The first end of each elastic device (202) is respectively rotatably connected to the end of the transverse cavity (200e) far from the longitudinal cavity (200d). The inner side wall of the transverse cavity (200e) facing the moving contact bridge (201) serves as a stop wall (2002e).

11. The contact mechanism according to claim 1, characterized in that: The static contact set (22) includes two static contacts (220) arranged at intervals. The two moving contact parts (2011) of the moving contact bridge (201) are respectively arranged opposite to the static contact parts (22004) of the two static contacts (220) at intervals. The end of each moving contact part (2011) is bent away from the static contact (220) to form a limiting part (2013).

12. Contact unit, including a unit housing (2h), characterized in that: The contact mechanism (20) as described in any one of claims 1-11 is provided in the unit housing (2h).

13. The contact unit according to claim 12, wherein: The moving contact assembly (21) is slidably arranged in the unit housing (2h). At least one limiting platform (23h) is provided in the unit housing (2h). The limiting platform (23h) is arranged opposite to the static contact set (22) at intervals. The moving contact bridge (201) moves between the limiting platform (23h) and the static contact (220). The limiting part (2013) of the moving contact bridge (201) abuts against the limiting platform (23h).

14. The contact unit according to claim 12, wherein: A linkage groove (20h) is formed in the middle of the unit housing (2h). The linkage part (200b) of the moving contact assembly (21) slides through the linkage groove (20h). The linkage part (200b) protrudes and extends outside the unit housing (2h).

15. The contact unit according to claim 12, characterized in that: Each contact unit (2) includes two static contacts (220). The first end of each static contact (22) is provided with a static contact part (22004). Both ends of the moving contact bridge (201) respectively serve as moving contact parts (2011). Each contact unit (2) further includes an arc extinguishing system. The arc extinguishing system includes an arc extinguishing chamber (24) and a magnetic enhancing part (23). The moving contact part (2011) contacts or separates from the static contact part (22004) at the arc inlet of the arc extinguishing chamber (24). The magnetic enhancing part (23) is arranged on both sides of the static contact part (22004) and the moving contact part (2011).

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