Contact mechanism

Abstract

The contact mechanism comprises moving contact assemblies, the moving contact assemblies are rotationally assembled and driven to rotate in the switching-on direction or the switching-off direction, each moving contact assembly comprises a rotating shaft and a moving contact which are coaxial and matched in a driving mode, each moving contact assembly further comprises an elastic assembly, the first end of each elastic assembly is connected with the corresponding moving contact, and the second end of each elastic assembly is connected with the corresponding moving contact. And the second end of the elastic assembly is elastically matched with the rotating shaft, and when the moving contact assembly is repelled by electrodynamic force to enable the moving contact to rotate relative to the rotating shaft, the second end of the elastic assembly is limited on the moving contact and used for limiting the moving contact to rotate in the closing direction. According to the utility model, the elastic assembly is respectively matched with the moving contact and the rotating shaft, contact pressure and elastic reset force are provided for the moving contact assembly during normal opening and closing, and the braking contact rotates towards the closing direction when the moving contact assembly is repelled by electrodynamic force to enable the moving contact to rotate relative to the rotating shaft.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a contact mechanism. Background Art

[0002] A circuit breaker is a switch device used to cut off and connect a load circuit, and to cut off a fault circuit to prevent the accident from expanding, thereby ensuring the safe operation of the load circuit. At present, in the moving contact assembly, the moving contact is rotatably connected to the rotating shaft, and the rotating shaft drives the moving contact assembly to rotate for opening and closing. An elastic component that provides contact pressure is installed between the rotating shaft and the moving contact assembly. When a short circuit fault occurs, before the short circuit current has arrived and the operating mechanism is tripped, the moving contact assembly will be repelled by the electric repulsion force. At this time, the moving contact assembly will rotate relative to the rotating shaft first, but due to the lack of a limiting structure in the existing circuit breaker, the moving contact assembly is easy to rotate due to the reduction of the electric repulsion force, so that the contact mechanism is connected again, causing welding between the contacts. Summary of the invention

[0003] The utility model aims to overcome at least one defect of the prior art and provide a contact mechanism which can be limited after being opened.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a contact mechanism, including a moving contact assembly, which is rotatably assembled and driven to rotate in a closing direction or an opening direction, each moving contact assembly includes a coaxial and drive-matched rotating shaft and a moving contact, the moving contact assembly also includes an elastic assembly, the first end of the elastic assembly is connected to the moving contact, and the second end of the elastic assembly is elastically matched with the rotating shaft. When the moving contact assembly is repelled by electric force to cause the moving contact to rotate relative to the rotating shaft, the second end of the elastic assembly is limited on the moving contact to limit the moving contact from rotating in the closing direction.

[0006] Preferably, it includes two moving contact assemblies, which rotate towards each other to make contact or rotate away from each other to separate to achieve closing or opening; or it includes a moving contact assembly and a static contact that cooperate with each other, and the moving contact assembly rotates in a direction close to or away from the static contact to achieve closing or opening.

[0007] Preferably, the moving contact is provided with a first limiting portion, a second limiting portion and a driving portion, and the rotating shaft is provided with a third limiting portion.

[0008] The first limiting portion and the third limiting portion are respectively located on two opposite sides of the axis of the moving contact assembly, and the second limiting portion and the third limiting portion are located on the same side of the axis of the moving contact assembly.

[0009] During normal opening and closing, the first end and the second end of the elastic component are elastically limited by the first limiting part and the third limiting part respectively.

[0010] When the moving contact assembly is repelled by the electric force, the driving part pushes the second end of the elastic assembly so that the second end of the elastic assembly is separated from the third limiting part and then limited to the second limiting part.

[0011] Preferably, the driving part is connected with the second limiting part. During normal opening and closing, the driving part is located between the second limiting part and the third limiting part. When the moving contact assembly is repelled by electric force, the driving part passes over and deviates from the third limiting part, and the second end of the elastic assembly is jointly limited by the second limiting part and the third limiting part.

[0012] Preferably, the second limiting portion is an open groove, the third limiting portion is an open groove or a limiting hole, and the third limiting portion includes a reset surface and a pressing surface that are spaced opposite to each other. When the moving contact assembly is repelled by electric force, at least a partial area of ​​the second limiting portion corresponds to the area between the pressing surface and the reset surface, and the second end of the elastic assembly is simultaneously engaged by the second limiting portion and the pressing surface.

[0013] Preferably, the lowest point of the second limiting portion is higher than the lowest point of the third limiting portion.

[0014] Preferably, the driving portion is formed by an end portion of a side wall of the second limiting portion close to the third limiting portion, and an end face of the driving portion is arc-shaped.

[0015] Preferably, the elastic component comprises a contact spring, one end of the contact spring is connected to the moving contact as the first end of the elastic component, and the other end of the contact spring is connected to a spring connecting rod, which is the second end of the elastic component.

[0016] Preferably, the contact spring includes at least one tension spring, one end of the tension spring is bent outward to form a first elastic arm, the first elastic arm is connected to the moving contact as the first end of the elastic component, and the other end of the tension spring is extended outward to form a hook portion, and the hook portion is connected to the spring connecting rod.

[0017] Preferably, the contact spring comprises two tension springs arranged side by side, a limiting interval is left between the two tension springs for the moving contact to pass through, the first elastic arms of the two tension springs are connected and cross the moving contact, and the two ends of the spring connecting rod pass through the two hook portions respectively.

[0018] Preferably, a radial assembly groove is provided in the middle of the rotating shaft, and an opening groove serving as a third limiting portion is provided at one end edge of the assembly groove.

[0019] The moving contact includes a connecting part, which is assembled in the assembly groove along the radial rotation of the assembly groove, an end of the connecting part close to the third limiting part is provided with an open groove serving as a second limiting part, and a driving part is formed by the side wall end of the second limiting part close to the third limiting part, an end of the connecting part away from the third limiting part is provided with an open groove serving as a first limiting part, and an end of the connecting part away from the third limiting part extends outwardly along a direction deviating from a connecting line between the first limiting part and the third limiting part to form a contact arm, and a moving contact is provided at an end of the contact arm away from the connecting part, and the moving contact and the first limiting part correspond to the same side of the contact arm.

[0020] Preferably, the two rotating shafts are linked and connected via a connecting rod mechanism, wherein the connecting rod mechanism comprises a first connecting rod, and both ends of the first connecting rod are respectively hinged to the two rotating shafts, or the connecting rod mechanism comprises two second connecting rods, and the first end of each second connecting rod is respectively hinged to a moving contact assembly, and the second ends of the two second connecting rods are hinged via a connecting shaft.

[0021] Preferably, the two rotating shafts are linked to each other via mutually meshing gear parts.

[0022] In the contact mechanism of the utility model, the elastic component cooperates with the moving contact and the rotating shaft respectively. During normal opening and closing, the elastic component can provide contact pressure and elastic reset force for the moving contact assembly. When the moving contact assembly is repelled by the electric force to cause the moving contact to rotate relative to the rotating shaft, the elastic component restricts the moving contact from rotating in the closing direction, thereby avoiding contact mechanism contact and welding before the operating mechanism is tripped.

[0023] In addition, the two moving contact assemblies rotate towards or away from each other to complete closing and opening, so that the contact mechanism has a larger opening distance, which is beneficial to improving the breaking performance of the circuit breaker.

[0024] In addition, the first end of the elastic component is connected to the first limiting portion, and the second end of the elastic component switches between the third limiting portion and the second limiting portion through the mutual cooperation between the moving contact and the rotating shaft, which has the advantages of simple structure, convenient cooperation and small space occupation.

[0025] In addition, the elastic component is composed of a contact spring and a spring connecting rod, occupies a small space, has a simple structure and is low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the circuit breaker in the utility model;

[0027] Figure 2 It is a structural schematic diagram of the contact mechanism in the utility model;

[0028] Figure 3 It is a structural schematic diagram of the rotating shaft of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the moving contact and the elastic component in the utility model;

[0030] Figure 5 It is an exploded schematic diagram of the moving contact and the elastic component in the utility model;

[0031] Figure 6 It is an exploded schematic diagram of the movable contact and the elastic component in the utility model (another embodiment of the contact support);

[0032] Figure 7 It is a structural schematic diagram of another embodiment of the elastic component in the utility model;

[0033] Figure 8 It is a schematic diagram of the connecting rod assembly and the moving contact assembly in the utility model;

[0034] Fig. 9 It is a cross-sectional view of the moving contact assembly of the utility model when the switch is in the open position;

[0035] Fig.10 It is a cross-sectional view of the moving contact assembly of the utility model when the switch is in full closing position;

[0036] Fig.11 It is a cross-sectional view of the utility model when the driving part pushes the second end of the elastic component to separate from the third limiting part;

[0037] Fig.12 It is a cross-sectional view of the utility model when the driving part pushes the second end of the elastic component to be matched with the second limiting part;

[0038] Fig.13 It is a cross-sectional view when the second end of the elastic component in the utility model is limited at the second limiting portion;

[0039] Reference numerals:

[0040] 2-operating mechanism, 22-connecting rod assembly, 3-contact mechanism, 33-rotating shaft, 330-assembly groove, 3301-first limiting wall, 3302-second limiting wall, 331-third limiting part, 3311-reset surface, 3312-tightening surface, 34-moving contact, 341-connecting part, 3411-first abutting surface, 3412-second abutting surface, 342-contact arm, 343-moving contact, 345-first limiting part, 346-second limiting part, 347-driving part, 35-contact spring, 350-limiting interval, 351-tension spring, 352-first elastic arm, 353-hook part, 36-spring connecting rod, 37-contact bracket, 39-assembly shaft, 4-arc extinguishing system. DETAILED DESCRIPTION

[0041] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the contact mechanism of the present utility model. The contact mechanism of the present utility model is not limited to the description of the following embodiments.

[0042] like Figure 1 As shown, the circuit breaker includes a shell, in which an operating mechanism 2 and at least one conductive system are arranged. The operating mechanism 2 is rotatably assembled in the shell, and the operating member connected to the operating mechanism 2 extends outside the shell. Each conductive system includes a contact mechanism 3 and an arc extinguishing system 4. The contact mechanism 3 is used to control the on and off of the main line in each conductive system. The contact mechanism 3 of at least one conductive system is drive-connected to the operating mechanism 2, and the moving contact assemblies of two adjacent conductive systems are linked. By driving the operating mechanism 2, the contact mechanisms 3 of each conductive system can be driven to be synchronously opened and closed; the arc extinguishing system 4 is cooperatively arranged on one side of the contact mechanism 3, and is used to extinguish the arc generated when the contact mechanism 3 is disconnected. The exhaust gas generated by the arc extinguishing system 4 is discharged from the exhaust port 104 opened on the shell.

[0043] Specifically, the contact mechanism 3 includes a rotatably assembled moving contact assembly. The moving contact assembly in at least one conductive system is drive-connected to the operating mechanism 2. Each moving contact assembly includes a rotating shaft 33 and a moving contact 34. The rotating shaft 33 and the moving contact 34 are coaxially rotatably assembled and driven in coordination. The operating mechanism 2 drives the moving contact assembly to rotate in the closing direction or the opening direction.

[0044] like Figure 2 and 4 -13, the improvement of the present application is that the moving contact assembly also includes an elastic assembly, the first end of the elastic assembly is connected to the moving contact 34, and the second end of the elastic assembly is elastically matched with the rotating shaft 33. During normal opening and closing, the moving contact 34 rotates synchronously with the rotating shaft 33. When the moving contact assembly is repelled by electric force to cause the moving contact 34 to rotate relative to the rotating shaft 33, the second end of the elastic assembly is limited on the moving contact 34 to limit the moving contact 34 from rotating in the closing direction.

[0045] In this way, the elastic component cooperates with the moving contact 34 and the rotating shaft 33 respectively. During normal opening and closing, the elastic component can provide contact pressure and elastic reset force for the moving contact assembly. When the moving contact assembly is repelled by the electric force to cause the moving contact 34 to rotate relative to the rotating shaft 33, the elastic component limits the moving contact 34 from rotating in the closing direction, thereby avoiding contact between the contact mechanism 3 and welding before the operating mechanism 2 is tripped.

[0046] Specifically, Figure 5-13As shown, the moving contact 34 is provided with a first limiting portion 345, a second limiting portion 346 and a driving portion 347, and the rotating shaft 33 is provided with a third limiting portion 331. The first limiting portion 345 and the third limiting portion 331 are respectively located on opposite sides of the axis of the moving contact assembly, and the second limiting portion 346 and the third limiting portion 331 are located on the same side of the axis of the moving contact assembly. When the switch is normally opened and closed, the first end and the second end of the elastic component are elastically limited by the first limiting portion 345 and the third limiting portion 331 respectively, and the elastic component can be a moving contact. The contact assembly provides contact pressure and reset force. When the moving contact assembly is repelled by the electric force, the moving contact 34 rotates relative to the rotating shaft 33, and the driving part 347 pushes the second end of the elastic assembly, so that the second end of the elastic assembly is separated from the third limiting part 331 and is limited by the second limiting part 346. The second end of the elastic assembly switches between the third limiting part 331 and the second limiting part 346 under the mutual cooperation of the moving contact 34 and the rotating shaft 33, which has the advantages of simple structure, convenient cooperation and small space occupation.

[0047] Preferably, the driving portion 347 is connected to the second limiting portion 346. During normal opening and closing, the driving portion 347 is located between the second limiting portion 346 and the third limiting portion 331. When the moving contact assembly is repelled by electric force and the moving contact 34 rotates relative to the rotating shaft 33, the driving portion 347 passes over and deviates from the third limiting portion 331. The second limiting portion 346 and the third limiting portion 331 jointly limit the second end of the elastic assembly, thereby further reducing the moving distance of the second end of the elastic assembly and ensuring its matching stability.

[0048] Combination Figure 1-13 A specific embodiment of a circuit breaker is provided.

[0049] like Figure 1 As shown, the circuit breaker includes a housing, with the height direction of the housing as the first direction, that is, Figure 1 The up-down direction in the figure is the length direction of the shell as the second direction, that is, Figure 1 The left and right directions are in the middle, and the thickness direction of the shell is the third direction, that is, Figure 1 In the direction perpendicular to the paper surface, the first direction, the second direction and the third direction are respectively perpendicular to each other.

[0050] An operating mechanism 2 and at least one conductive system are arranged in the housing, each conductive system includes a pair of wiring components 6, a contact mechanism 3 and an arc extinguishing system 4, the pair of wiring components 6 are arranged at intervals in the second direction, the contact mechanism 3 is located between the pair of wiring components 6 and is electrically connected to the pair of wiring components 6 respectively, and the contact mechanism 3 of at least one conductive system is driven and connected to the operating mechanism 2, and the operating mechanism 2 is driven to connect or disconnect the main line of each conductive system; the arc extinguishing system 4 is arranged on one side of the contact mechanism 3 to extinguish the arc generated when the contact mechanism 3 is disconnected.

[0051] In this embodiment, if Figure 2-13 As shown, the contact mechanism 3 includes a moving contact assembly driven by the operating mechanism 2, each moving contact assembly includes a rotating shaft 33, a moving contact 34 and an elastic assembly, wherein the rotating shaft 33 is rotatably arranged in the second assembly cavity 102 of the housing, the moving contact 34 is coaxially assembled with the rotating shaft 33 and driven to cooperate, the first end of the elastic assembly is connected to the moving contact 34, and during normal opening and closing, the second end of the elastic assembly is elastically matched with the rotating shaft 33. During this process, the elastic deformation can provide contact pressure and reset force for the contact mechanism 3 to ensure the stable use of the contact mechanism 3. When the moving contact 34 is repelled by the electric force, the moving contact 34 rotates in the opening direction relative to the rotating shaft 33, and the second end of the elastic assembly is limited on the moving contact 34 to limit the moving contact 34 from rotating in the closing direction, so as to avoid the moving contact 34 turning to the closing position before the operating mechanism 2 is tripped and connecting the main line, thereby causing welding between the moving contact assemblies.

[0052] Specifically, the moving contact 34 is provided with a first limiting portion 345, a second limiting portion 346 and a driving portion 347, wherein the first limiting portion 345 and the second limiting portion 346 are respectively located on both sides of the axis of the moving contact 34, the second limiting portion 346 and the third limiting portion 331 are located on the same side of the rotation axis of the moving contact assembly, and the driving portion 347 drives the second end of the elastic assembly to move to switch the limiting point, that is, as the moving contact 34 and the rotating shaft 33 rotate relative to each other, the driving portion 347 pushes the second end of the elastic assembly to separate from the third limiting portion 331 and then cooperate with the second limiting portion 346. Preferably, the driving portion 347 is adjacent to and connected with the second limiting portion 346, which is beneficial to shortening the moving distance of the second end of the elastic assembly and ensuring stable cooperation.

[0053] During normal opening and closing, the first end and the second end of the elastic component are elastically limited by the first limiting portion 345 and the second limiting portion 346 respectively, and the driving portion 347 is located between the second limiting portion 346 and the third limiting portion 331; when the moving contact 34 is repelled by the electric force, the rotation of the moving contact 34 relative to the rotating shaft 33 drives the driving portion 347 to cross and deviate from the third limiting portion 331, so that the first limiting portion 345, the second limiting portion 346 and the third limiting portion 331 are collinear. During this process, the driving portion 347 drives the second end of the elastic component to separate from the third limiting portion 331 and cooperate with the second limiting portion 346. The first end of the elastic component is still limited by the first limiting portion 345, and the second end of the elastic component is limited by the second limiting portion 346 and the third limiting portion 331, so that the moving contact 34 cannot rotate in the closing direction.

[0054] Preferably, the contact mechanism 3 of each conductive system includes two movable contact assemblies assembled and rotated side by side. Preferably, the two movable contact assemblies have the same structure and form a symmetrical structure. The two movable contact assemblies are linked by a connecting rod mechanism or a gear transmission mechanism. One of the movable contact assemblies is driven and connected to the operating mechanism 2, and the operating mechanism 2 drives the two movable contact assemblies to rotate toward each other for contact or rotate away from each other for separation. The two movable contact assemblies rotate toward each other or away from each other synchronously and stably, which increases the opening distance of the contact mechanism 3 and multiplies the opening speed of the contact mechanism 3, which is beneficial to improving the breaking performance of the circuit breaker.

[0055] Combination Figure 1-13 A specific structure of a first contact mechanism 3 is provided.

[0056] like Figure 1 As shown, the contact mechanism 3 includes two movable contact assemblies rotatably assembled side by side, the two movable contact assemblies have the same and symmetrical structures, one of the movable contact assemblies is connected to the connecting rod assembly 22, and a connecting rod mechanism is arranged between the two movable contact assemblies of the same contact mechanism 3, the connecting rod mechanism includes a straight rod-shaped first connecting rod 311, and the two ends of the first connecting rod 311 are respectively hinged to the two movable contact assemblies, or, the connecting rod mechanism includes two second connecting rods, one end of each second connecting rod is connected to the rotating shaft 33, and the other end of the second connecting rod is hinged; or, a gear transmission mechanism is arranged between the two movable contact assemblies of the same contact mechanism 3, the gear transmission mechanism includes gear parts that are meshed with each other, and the gear parts are arranged on the circumferential side wall of the rotating shaft 33.

[0057] Specifically, Figure 2-7 As shown, each moving contact assembly includes a rotating shaft 33, a moving contact 34 and an elastic assembly. The rotating shaft 33 is cylindrical, and the rotating shafts 33 of the two moving contact assemblies are linked and connected; an assembly groove 330 is provided in the middle of the rotating shaft 33, and the assembly groove 330 is connected along the radial direction of the rotating shaft 33. The two opposite side walls of the assembly groove 330 are respectively a first limiting wall 3301 and a second limiting wall 3302, and the two ends of the assembly groove 330 are respectively open, and an opening groove with an opening gradually increasing is provided at the edge of one end of the assembly groove 330, and the opening groove serves as a third limiting portion 331, and the third limiting portion 331 is located at a position closer to the first limiting wall 3301, and the third limiting portion 331 includes a reset surface 3311 and a pressing surface 3312 that are spaced opposite to each other, wherein the pressing surface 3312 is closer to the first limiting wall 3301. Of course, the third limiting portion 331 may also be a limiting hole with a sufficiently large inner diameter, and the two opposite sides of the limiting hole are the reset surface 3311 and the pressing surface 3312 respectively.

[0058] The movable contact 34 includes a plate-shaped connecting portion 341, which is arranged in the assembly groove 330 along the radial rotation of the assembly groove 330, and the side walls of the connecting portion 341 on opposite sides are respectively a first abutting surface 3411 and a second abutting surface 3412, wherein the first abutting surface 3411 faces the first limiting wall 3301, and the second abutting surface 3412 faces the second limiting wall 3302, and an open groove is respectively formed at the opposite ends of the connecting portion 341, wherein the connecting portion 341 near the third limiting wall is provided with a groove. The opening groove at one end of the positioning portion 331 serves as the second limiting portion 346, and the side wall end of one side of the second limiting portion 346 serves as the driving portion 347. Preferably, the end surface of the driving portion 347 is arc-shaped, which is conducive to the second end of the elastic component sliding over the driving portion 347. When the moving contact 34 is repelled, at least a part of the second limiting portion 346 corresponds to the area between the abutting surface and the reset surface 3311, and the second end of the elastic component can be simultaneously limited by the second limiting portion 346 and the abutting surface 3312. Fig.13 As shown, one of the side walls on both sides of the opening of the second limiting portion 346 is located between the reset surface 3311 and the pressing surface 3312, and the other side wall is located outside the third limiting portion 331 and deviates from the same side of the pressing surface 3312 as the driving portion 347. The second end of the elastic component is simultaneously abutted against the pressing surface 3312 and the second limiting portion 346 for limiting. The first limiting portion 345, the second limiting portion 346 and the third limiting portion 331 are collinear at this time to prevent the second end of the elastic component from separating from the second limiting portion 346 and crossing the driving portion 347. It should be noted that the inner diameter of the second limiting portion 346 and the third limiting portion 331 away from the opening end is greater than or equal to the outer diameter of the second end of the elastic component, but the size relationship of the inner diameter of the second limiting portion 346 and the third limiting portion 331 away from the opening end can be adjusted according to actual conditions, that is, adjusted according to the relative rotation amplitude between the moving contact 34 and the rotating shaft 33.

[0059] Preferably, the lowest point of the second limiting portion 346 is higher than the lowest point of the third limiting portion 331 , thereby further changing the deformation amount of the elastic component, which is beneficial to ensure the matching stability between the elastic component and the moving contact 34 .

[0060] The open groove in the connecting portion 341 away from the third limiting portion 331 serves as the first limiting portion 345. The end of the connecting portion 341 away from the third limiting portion 331 extends outward to form a contact arm. The contact arm extends along a direction deviating from the line connecting the first limiting portion 345 and the third limiting portion 331. A moving contact 343 is provided at the end of the contact arm away from the connecting portion 341, and the moving contact 343 and the first limiting portion 345 correspond to the same side of the contact arm.

[0061] like Figure 2-6As shown, the elastic component includes a contact spring 35 and a spring connecting rod 36. One end of the contact spring 35 is connected to the moving contact 34 as the first end of the elastic component, that is, it is connected to the first limiting portion 345. The other end of the contact spring 35 is connected to a spring connecting rod 36. The spring connecting rod 36 serves as the second end of the elastic component and cooperates with the second limiting portion 346 and the third limiting portion 331 respectively. In this embodiment, the axial movement of the spring connecting rod 36 can be limited by the cooperation between the moving contact 34 and the rotating shaft 33.

[0062] like Figure 5 , 6 As shown, the contact spring 35 preferably includes at least one tension spring 351, the twisted portion of the tension spring 351 is arranged along one side of the moving contact 34, one end of the tension spring 351 is bent outward to form a first elastic arm 352, the first elastic arm 352 can abut against the first limiting portion 345, and the other end of the tension spring 351 extends outward and bends to form a hook portion 353, and the hook portion 353 is connected to the spring connecting rod 36.

[0063] In this embodiment, the contact spring 35 includes two tension springs 351 arranged side by side, and a limiting gap 350 is left between the two tension springs 351 for the moving contact 34 to pass through, so that each tension spring 351 is correspondingly arranged on one side of the moving contact 34, and the first elastic arms 352 of the two tension springs 351 are connected and cross the moving contact 34. At this time, the two first elastic arms 352 serve as the first end of the elastic component, and the two ends of the spring connecting rod 36 pass through the two bent hook portions 353 respectively, thereby ensuring the connection stability between the elastic component and the moving contact 34.

[0064] like Figure 7 As shown, as another embodiment of the elastic component, the elastic component includes a contact spring 35 and a spring connecting rod 36, the contact spring 35 includes two tension springs, the twisted portion of each tension spring is arranged along one side of the moving contact 34, and the two ends of the tension spring extend outward and bend to form a hook portion, the spring connecting rod 36 includes a first branch rod 361 and a second branch rod 362, wherein one hook portion of the two tension springs is commonly connected to the first branch rod 361, and the first branch rod 361 forms the first end of the elastic component after connecting the two tension springs, the first branch rod 361 is connected to the moving contact 34, the first branch rod 361 can be elastically abutted against the first limiting portion 345, and the first limiting portion 345 can also be a through hole for the first branch rod 361 to pass through, the other hook portions of the two tension springs are commonly connected to the second branch rod 362, and the second branch rod 362 forms the second end of the elastic component after connecting the two tension springs, and the second branch rod 362 cooperates with the third limiting portion.

[0065] The matching process of the rotating shaft 33, the moving contact 34 and the elastic component is as follows:

[0066] When the contact mechanism 3 is normally opened and closed, the first end and the second end of the elastic component cooperate with the first limit part 345 and the third limit part 331 respectively, and the elastic component is deformed to provide a reset force or contact pressure for the moving contact assembly. When a large current flows through the main line, the moving contact assembly is repelled by the electric force, and the first end of the elastic component is still connected to the first limit part 345, and the second end of the elastic component moves to the second limit part 346 and is limited to the second limit part 346. At this time, the first limit part 345, the second limit part 346 and the third limit part 331 are collinear, so that the moving contact 34 cannot rotate in the closing direction, thereby avoiding re-closing before the operating mechanism 2 is tripped.

[0067] Specific as Fig.10 , 11 As shown, during normal opening and closing, the rotating shaft 33 drives the moving contact 34 to rotate for opening and closing. At this time, there is no relative rotation between the rotating shaft 33 and the moving contact 34. In the opening state (see Fig.10 ), the first abutting surface 3411 abuts against the first limiting wall 3301, and the moving contact 34 maintains balance under the support force provided by gravity, the elastic force of the elastic component and the first limiting wall 3301; in the first half of the closing rotation of the moving contact 34, there is no relative rotation between the moving contact 34 and the rotating shaft 33, and the first abutting surface 3411 always abuts against the first limiting wall 3301. When the two moving contacts 34 abut, the rotating shaft 33 continues to rotate. At this time, the two moving contacts 34 maintain contact and do not rotate. The first abutting surface 3411 is separated from the first limiting wall 3301. At this time, the moving contact 34 is balanced by the gravity, the elastic force of the elastic component and the reaction force of the other moving contact 34 (or the static contact). During the opening and closing rotation process, the first end and the second end of the elastic component cooperate with the first limiting portion 345 and the second limiting portion 346 respectively. In addition, it should be noted that in the closed state (see Fig.11 ), there is a gap between the first abutting surface 3411 and the first limiting wall 3301, which is used to provide an overtravel to ensure the contact pressure when the contact mechanism 3 is closed.

[0068] When a large current flows through the main circuit, before the rotating shaft 33 rotates in the opening direction, the moving contact 34 rotates in the opening direction relative to the rotating shaft 33 ( Figure 1 In the embodiment, the left movable contact assembly rotates in a clockwise direction, and the right movable contact assembly rotates in a counterclockwise direction), at this time, the second abutting surface 3412 is close to or in contact with the second limiting wall 3302, and the first limiting surface is away from the first limiting wall 3301. At the same time, the driving part 347 first abuts against the second end of the elastic component (see Fig.12 , 13), that is, the driving part 347 abuts against the spring connecting rod 36, so that the second end of the elastic component is separated from the third limiting part 331. As the moving contact assembly 34 continues to rotate, the driving part 347 passes over the third limiting part 331, and the second end of the elastic component falls into the second limiting part 346 (see Fig.13 ), since the groove bottom of the second limiting portion 346 is higher than the groove bottom of the third limiting portion 331, the elastic component is deformed and abutted by the second limiting portion 346;

[0069] When the electric force decreases, the moving contact 34 tends to fall back due to its own weight, that is, it rotates in the closing direction relative to the rotating shaft 33. At this time, the side wall ( Fig.13 The side wall in the middle is close to the left side), the pressing surface 3312 and the bottom surface of the groove of the second limiting portion 346 jointly limit the second end of the elastic component, and the elastic component provides a reverse torque balanced with gravity for the moving contact 34, so that the second end of the elastic component cannot pass over the driving portion 347 before the operating mechanism 2 is tripped, thereby preventing the moving contact 34 from falling due to the reduction of the electric repulsive force.

[0070] When the operating mechanism 2 is tripped, the operating mechanism 2 drives the rotating shaft 33 to rotate in the opening direction, and the moving contact 34 is blocked by the structure arranged in the shell and cannot continue to rotate. The reset surface 3311 of the second limiting portion 346 pushes the second end of the elastic component to pass over the driving portion 347 and fall into the third limiting portion 331 again.

[0071] Further, such as Figure 6 , 7 As shown, the moving contact assembly further includes a contact bracket 37, and the moving contact 34 is arranged on the rotating shaft 33 through the contact bracket 37. Figure 6 In the embodiment, the middle part of the contact bracket 37 is a U-shaped frame, and the moving contact 34 passes through the middle part of the contact bracket 37. Preferably, as shown in FIG. Figure 7 As shown, an open groove is provided on one side of the two side walls of the U-shaped frame near the first limit portion 345, and the two side walls extend outward to form a mounting surface. The contact bracket 37 is fixed to the rotating shaft 33 by screws, and the moving contact 34 and the open groove of the contact bracket 37 are coaxially assembled through the assembly shaft 39. The moving contact 34 is acted upon by the elastic component to resist the bottom of the open groove and is rotatably assembled in the assembly groove 330 of the rotating shaft 33.

[0072] In addition, in this embodiment, the contact mechanism 3 includes two rotatably assembled moving contact assemblies, each moving contact assembly adopts the above structure. When the contact mechanism 3 includes a moving contact assembly and a stationary contact that cooperate with each other, its moving contact assembly can also adopt the above structure.

[0073] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0074] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A contact mechanism, comprising a moving contact assembly, wherein the moving contact assembly is rotatably assembled and driven to rotate in a closing direction or an opening direction, wherein each moving contact assembly comprises a coaxial rotating shaft (33) and a moving contact (34) that are drive-matched, and wherein: The moving contact assembly also includes an elastic assembly, a first end of the elastic assembly is connected to the moving contact (34), and a second end of the elastic assembly is elastically matched with the rotating shaft (33). When the moving contact assembly is repelled by electric force so that the moving contact (34) rotates relative to the rotating shaft (33), the second end of the elastic assembly is limited on the moving contact (34) to limit the moving contact (34) from rotating in the closing direction.

2. The contact mechanism according to claim 1, characterized in that: It includes two moving contact assemblies, which rotate towards each other to make contact or rotate away from each other to separate to achieve closing or opening; or it includes a moving contact assembly and a static contact that cooperate with each other, and the moving contact assembly rotates in a direction close to or away from the static contact to achieve closing or opening.

3. The contact mechanism according to claim 1 or 2, characterized in that: The moving contact (34) is provided with a first limiting portion (345), a second limiting portion (346) and a driving portion (347), and the rotating shaft (33) is provided with a third limiting portion (331). The first limiting portion (345) and the third limiting portion (331) are respectively located on opposite sides of the axis of the moving contact assembly, and the second limiting portion (346) and the third limiting portion (331) are located on the same side of the axis of the moving contact assembly. During normal opening and closing, the first end and the second end of the elastic component are elastically limited by the first limiting portion (345) and the third limiting portion (331), respectively. When the moving contact assembly is repelled by the electric force, the driving part (347) pushes the second end of the elastic assembly, so that the second end of the elastic assembly is separated from the third limiting part (331) and is limited to the second limiting part (346).

4. The contact mechanism according to claim 3, characterized in that: The driving part (347) is connected to the second limiting part (346). During normal opening and closing, the driving part (347) is located between the second limiting part (346) and the third limiting part (331). When the moving contact assembly is repelled by electric force, the driving part (347) passes over and deviates from the third limiting part (331), and the second limiting part (346) and the third limiting part (331) jointly limit the second end of the elastic assembly.

5. The contact mechanism according to claim 3, characterized in that: The second limiting portion (346) is an open groove, the third limiting portion (331) is an open groove or a limiting hole, and the third limiting portion (331) includes a reset surface (3311) and a pressing surface (3312) that are spaced apart from each other. When the moving contact assembly is repelled by electric force, at least a partial area of ​​the second limiting portion (346) corresponds to between the pressing surface (3312) and the reset surface (3311), and the second end of the elastic assembly is simultaneously engaged by the second limiting portion (346) and the pressing surface (3312).

6. The contact mechanism according to claim 5, characterized in that: The lowest point of the second limiting portion (346) is higher than the lowest point of the third limiting portion (331).

7. The contact mechanism according to claim 6, characterized in that: The driving portion (347) is formed by a side wall end portion of the second limiting portion (346) close to the third limiting portion (331), and an end surface of the driving portion (347) is arc-shaped.

8. The contact mechanism according to claim 1 or 2, characterized in that: The elastic component comprises a contact spring (35), one end of the contact spring (35) being connected to the moving contact (34) as the first end of the elastic component, and the other end of the contact spring (35) being connected to a spring connecting rod (36), and the spring connecting rod (36) being the second end of the elastic component.

9. The contact mechanism according to claim 8, characterized in that: The contact spring (35) comprises at least one tension spring (351), one end of the tension spring (351) is bent outward to extend to form a first elastic arm (352), the first elastic arm (352) is connected to the moving contact (34) as the first end of the elastic component, and the other end of the tension spring (351) is extended outward to bend to form a hook portion (353), and the hook portion (353) is connected to the spring connecting rod (36).

10. The contact mechanism according to claim 8, characterized in that: The contact spring (35) comprises two tension springs (351) arranged side by side, a limiting interval (350) is left between the two tension springs (351) for the moving contact (34) to pass through, the first elastic arms (352) of the two tension springs (351) are connected and cross the moving contact (34), and the two ends of the spring connecting rod (36) pass through the two hook portions (353) respectively.

11. The contact mechanism according to claim 1 or 2, characterized in that: A radial assembly groove (330) is provided in the middle of the rotating shaft (33), and an opening groove serving as a third limiting portion (331) is provided at one end edge of the assembly groove (330). The movable contact (34) comprises a connecting portion (341), the connecting portion (341) being assembled in the assembly groove (330) by rotating along the radial direction of the assembly groove (330), an end of the connecting portion (341) close to the third limiting portion (331) is provided with an open groove as a second limiting portion (346), a driving portion (347) is formed by a side wall end of the second limiting portion (346) close to the third limiting portion (331), and a side wall of the connecting portion (341) away from the third limiting portion (331) is provided with a drive portion (347). An open groove serving as a first limiting portion (345) is provided at one end, and an end of the connecting portion (341) away from the third limiting portion (331) extends outwardly in a direction deviating from a line connecting the first limiting portion (345) and the third limiting portion (331) to form a contact arm (342), and a moving contact point (343) is provided at one end of the contact arm (342) away from the connecting portion (341), and the moving contact point (343) and the first limiting portion (345) correspond to the same side of the contact arm (342).

12. The contact mechanism according to claim 2, characterized in that: The two rotating shafts (33) are linked and connected via a connecting rod mechanism, wherein the connecting rod mechanism comprises a first connecting rod (311), wherein both ends of the first connecting rod (311) are respectively hinged to the two rotating shafts (33); or, the connecting rod mechanism comprises two second connecting rods (312), wherein the first end of each second connecting rod (312) is respectively hinged to a moving contact assembly, and the second ends of the two second connecting rods (312) are hinged via a connecting shaft (314).

13. The contact mechanism according to claim 2, characterized in that: The two rotating shafts (33) are linked and connected via mutually meshing gear parts.

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