Contact mechanism and contact unit

Abstract

A contact mechanism and a contact unit, the contact mechanism comprises a moving contact assembly and a pair of static contact assemblies, the moving contact assembly comprises a rotating shaft and a moving contact bridge arranged on the rotating shaft, the two ends of the moving contact bridge are respectively provided with a moving contact part, the static contact assembly comprises a static contact part, the moving contact assembly further comprises a shell, and the shell is provided with an opening. The containing cavity of the shell is provided with two opposite openings, the pair of static contact assemblies are arranged on the shell to enable the two static contact parts to be opposite in the containing cavity in a spaced mode, the rotating shaft is rotationally arranged between the two static contact parts, and each movable contact part makes contact with or is separated from one static contact part. And the moving contact assembly is matched with the accommodating cavity to prevent the two openings from being communicated with each other. The movable contact assembly is matched with the containing cavity to prevent the two openings from being communicated with each other, so that two independent spaces are formed in the containing cavity, and mutual interference is avoided.

Description

Technical Field

[0001] The invention relates to the field of switch electrical appliances, and in particular to a contact mechanism and a contact unit. Background Art

[0002] With the rapid development of the AC and DC electrical industry, rotary isolating switches have been widely used. An isolating switch is a switch device that has both isolating and switching functions. However, in traditional rotary isolating switches, a moving contact assembly and a pair of stationary contact assemblies are usually provided, wherein the moving contact assembly is located between the pair of stationary contact assemblies, and the moving contact assembly is driven to rotate by the operating mechanism to achieve contact and separation with the stationary contact assembly. However, the moving contact assembly and the stationary contact assembly are usually dispersedly assembled in the housing. Due to the complex structure of the moving contact assembly, its assembly process is relatively cumbersome, which is not conducive to ensuring the coordination stability between the contact mechanisms, nor is it conducive to the modular development of the isolating switch. Summary of the invention

[0003] The object of the present invention is to overcome at least one defect of the prior art and to provide a contact mechanism and a contact unit with a simple structure and high reliability.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides a contact mechanism, comprising a moving contact assembly and a pair of stationary contact assemblies, wherein the moving contact assembly comprises a rotating shaft and a moving contact bridge arranged on the rotating shaft, and moving contact parts are respectively arranged at both ends of the moving contact bridge, and the stationary contact assembly comprises a stationary contact part, and the moving contact assembly also comprises a shell, and an accommodating cavity of the shell is provided with two opposite openings, and a pair of stationary contact assemblies are arranged on the shell so that the two stationary contact parts are spaced and opposite to each other in the accommodating cavity, and the rotating shaft is rotatably arranged between the two stationary contact parts, and each moving contact part contacts or separates from a stationary contact part, and the moving contact assembly cooperates with the accommodating cavity to block the two openings from being connected to each other.

[0006] Preferably, two opening limit portions are protruding from the circumferential side wall of the rotating shaft, and when the rotating shaft rotates to the opening position, the two opening limit portions abut against the inner wall of the shell to prevent the two openings from being connected to each other.

[0007] Preferably, the two pairs of shell side walls connected between the two openings are respectively a pair of connecting walls and a pair of supporting walls, the connecting walls are adjacent to the supporting walls, each connecting wall is provided with an assembly groove, each assembly groove corresponds to a limit assembly of a static contact assembly, the rotating shaft is rotatably supported between a pair of supporting walls, and each moving contact part rotates between a pair of connecting walls.

[0008] Preferably, each opening gate limiting portion is adjacent to a moving contact portion, and the two opening gate limiting portions form a rotationally symmetrical structure about the axis of the rotating shaft.

[0009] Preferably, a gate-breaking barrier portion is provided in the accommodating chamber, the gate-breaking barrier portion is located on the track of the gate-breaking limiting portion, and the gate-breaking barrier portion cooperates and abuts against the gate-breaking limiting portion to block the two openings from being connected to each other.

[0010] Preferably, the gate-isolating portions are respectively located on a pair of connecting walls.

[0011] Preferably, a static contact portion and a gate-breaking barrier portion are respectively located on the connecting walls on both sides of the same opening of the shell, a dynamic contact portion and a gate-breaking limit portion rotate together between a static contact portion and a gate-breaking barrier portion, and a gate-breaking limit portion is located on the side of a dynamic contact portion facing away from the static contact portion.

[0012] Preferably, the stationary contact assembly comprises a conductive plate, the conductive plate is limitedly passed through the assembly slot, a stationary contact portion is provided at one end of the conductive plate located in the accommodating cavity, and a wiring portion is provided at one end of the conductive plate located outside the shell.

[0013] Preferably, the shell includes two plates spaced opposite to each other, the space between the two plates serves as a accommodating cavity, extension portions are provided on both side edges of each plate, the extension portions on the same side of the two plates are butted together to form a connecting wall, and the middle portions of the two plates serve as a pair of supporting walls.

[0014] Preferably, a buckle and a slot that cooperate with each other are provided between the extension portions on the same side of the two plates.

[0015] The present invention further provides a contact unit, comprising a housing, wherein the contact mechanism as described above is arranged in the middle of the housing.

[0016] Furthermore, two arc extinguishing systems are arranged in the shell, the contact mechanism is located between the two arc extinguishing systems, and the arc entry port of each arc extinguishing system is respectively connected to an opening of the shell.

[0017] The contact mechanism and contact unit of the present invention, wherein the moving contact assembly and the static contact portion are assembled together in a shell, so that the contact mechanism forms a modular structure, which is convenient for assembly and ensures the matching stability of the moving contact assembly and the static contact assembly. The moving contact assembly cooperates with the accommodating cavity to block the two openings from being connected to each other, so that two independent spaces are formed in the accommodating cavity to avoid mutual interference.

[0018] In addition, the two opening limit parts cooperate with the interior of the shell to block the two openings from being connected to each other. In particular, the opening limit part and the opening blocking part cooperate with each other. When the rotating shaft rotates to the opening position, they can not only block the two openings from being connected to each other, but also have the effect of airtight guidance and increasing the creepage distance.

[0019] In addition, the contact support of the rotating shaft is connected to the cover plate through a snap-fit ​​piece to form a detachable rotating shaft, which is convenient for assembling the moving contact bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the contact mechanism in the present invention;

[0021] Figure 2-3 It is a schematic diagram of the exploded structure of the contact mechanism in the present invention;

[0022] Figure 4-5 It is a schematic diagram of the structure of the rotating shaft, the moving contact bridge and the buckle member in the present invention;

[0023] Figure 6 It is a schematic diagram of the exploded structure of the contact support, the moving contact bridge and the snap fastener in the present invention;

[0024] Figure 7 Schematic diagram of the structure of the contact support in the present invention (the side facing the cover plate);

[0025] Figure 8 Schematic diagram of the structure of the contact support in the present invention (the side facing away from the cover plate);

[0026] Fig. 9 Schematic diagram of the structure of the cover plate in the present invention (the side facing away from the contact support);

[0027] Fig.10 Schematic diagram of the structure of the cover plate in the present invention (the side facing the contact support);

[0028] Fig.11 : is a schematic diagram of the structure of the cover body in the present invention (the side facing away from the accommodating cavity);

[0029] Fig.12 : is a schematic diagram of the structure of the cover body in the present invention (the side facing the accommodating cavity);

[0030] Fig.13 It is a structural schematic diagram of the contact unit in the present invention;

[0031] Reference numerals:

[0032] a-contact mechanism, 1-moving contact assembly, 11-rotating shaft, 111-contact support, 1111-radial groove, 112-cover plate, 1121-through hole, 113-rotating part, 114-transmission shaft, 115-opening limit part, 116-clamping groove, 117-transmission groove, 12-moving contact bridge, 120-moving contact part, 13-clamp, 2-static contact assembly, 21-static contact part, 22-wiring part, 3-shell, 301-plate body, 302-support wall, 303-connecting wall, 304-extension part, 31-assembly groove, 32-opening barrier part, 33-connecting hole, 351-clamp, 352-clamping groove, 361-positioning groove, 40-arc extinguishing chamber, 5-shell. DETAILED DESCRIPTION

[0033] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the contact mechanism and the contact unit of the present invention. The contact mechanism and the contact unit of the present invention are not limited to the description of the following embodiments.

[0034] The isolating switch comprises an operating module and a contact module which are stacked. The contact module comprises at least one contact unit. Two adjacent contact units are linked and connected. The operating mechanism of the operating module drives at least one contact unit to open and close the switch.

[0035] Specifically, Fig.13 As shown, each contact unit includes a housing 5, in which a contact mechanism a and a pair of wiring assemblies are arranged, the contact mechanism a includes a moving contact assembly 1 and a pair of static contact assemblies 2, each static contact assembly 2 is connected to a wiring assembly, the moving contact assembly 1 rotates between the pair of static contact assemblies 2, and is used to connect or disconnect the main line in each contact unit, wherein the moving contact assembly 1 includes a rotating shaft 11 and a pair of moving contact parts 120 arranged in the rotating shaft 11, the rotating shaft 11 is rotatably arranged between the pair of static contact assemblies 2, a moving contact bridge 12 is arranged in the rotating shaft 11, and the two ends of the moving contact bridge 12 serve as moving contact parts 120 respectively, each moving contact part 120 extends radially to the outside of the rotating shaft 11, as the rotating shaft 11 is driven to rotate, each moving contact part 120 is respectively in contact with or separated from a static contact assembly 2; two adjacent contact units are linked and connected through the rotating shaft 11, so as to realize the synchronous opening and closing of the contact mechanism a in all contact units.

[0036] The improvement of this application is that Figure 1-3As shown, the moving contact assembly 1 also includes a shell 3, and the accommodating cavity of the shell 3 is provided with two opposite openings. The static contact assembly 2 is arranged on the shell 3 so that the two static contact parts 21 are spaced and opposite to each other in the accommodating cavity. The rotating shaft 11 is rotatably arranged between the two static contact parts 21, and each moving contact part 120 is in contact with or separated from a static contact part 21. The moving contact assembly 1 cooperates with the accommodating cavity to block the two openings from being connected to each other, that is, the two openings are two independent spaces to avoid mutual interference.

[0037] The moving contact assembly 1 and the static contact portion 21 are assembled together in the housing 3, so that the contact mechanism a forms a modular structure, which is convenient for assembly and ensures the matching stability of the moving contact assembly 1 and the static contact assembly 2. The moving contact assembly 1 cooperates with the accommodating cavity to block the two openings from being connected to each other, so that two independent spaces are formed in the accommodating cavity to avoid mutual interference.

[0038] Specifically, the two pairs of shell 3 side walls connected between the two openings are a pair of connecting walls 303 and a pair of supporting walls 302, respectively. The connecting walls 303 and the supporting walls 302 are adjacent, and each connecting wall 303 is provided with an assembly groove 31. Each assembly groove 31 corresponds to a fixed position assembly of a static contact assembly 2. The rotating shaft 11 is rotatably supported between the pair of supporting walls 302, and each moving contact portion 120 rotates between the pair of connecting walls 303. The circumferential side wall of the rotating shaft 11 is protruded with two opening limiter portions 115. The two opening limiter portions 115 form a rotationally symmetrical structure about the axis of the rotating shaft 11. When the rotating shaft 11 rotates to the opening position, the two opening limiter portions 115 abut against the inner wall of the shell 3 to block the two openings from being connected to each other, so that two independent spaces are formed in the accommodating cavity to avoid mutual interference. At the same time, the two opening limiter portions 115 can also limit the further rotation of the rotating shaft 11 when it is in the opening position, and have the technical effect of opening limiter.

[0039] Preferably, a gate-breaking barrier portion 32 is provided on the inner wall of the shell 3 (inside the accommodating chamber), and each gate-breaking barrier portion 32 is located on the moving trajectory of the gate-breaking limit portion 115. Specifically, each gate-breaking barrier portion 32 can be respectively provided on a pair of connecting walls 303 of the shell 3. When the rotating shaft 11 rotates to the gate-breaking position, the gate-breaking limit portion 115 respectively cooperates and abuts against the gate-breaking barrier portion 32 to block the two openings from being connected to each other, thereby forming two independent spaces in the accommodating chamber to avoid mutual interference, while having the effects of airtight guidance and increasing the creepage distance.

[0040] Combination Figure 1-12 A specific embodiment of a contact mechanism a is provided. The contact mechanism a comprises a moving contact assembly 1 and a stationary contact assembly 2.

[0041] like Figure 1-6As shown, the moving contact assembly 1 includes a shell 3, a rotating shaft 11 and a moving contact bridge 12. The accommodating cavity of the shell 3 is provided with two opposite openings. The rotating shaft 11 is rotatably supported in the accommodating cavity between the two openings. The moving contact bridge 12 is arranged in the rotating shaft 11 along the radial direction of the rotating shaft 11. Both ends of the moving contact bridge 12 serve as moving contact parts 120 extending to the outside of the rotating shaft 11 along the radial direction of the rotating shaft 11. In the present embodiment, each moving contact part 120 corresponds to one opening respectively, that is, when the moving contact assembly 1 is rotated for opening and closing, each moving contact part 120 rotates from one side of an opening to the other side of the same opening. During this process, a partial area of ​​the moving contact part 120 can extend out of the opening.

[0042] Specific as Figure 1-3 As shown in Figures 11 and 12, the two pairs of side walls of the shell 3 connected between the two openings are respectively a pair of supporting walls 302 and a pair of connecting walls 303, each connecting wall 303 is adjacent to a supporting wall 302, and a connecting hole 33 is opened in the middle of the pair of supporting walls 302. The rotating shaft 11 is rotatably supported between the pair of connecting walls 303, and each connecting hole 33 is coaxial with the rotating shaft 11, so that the output shaft of the operating mechanism or the transmission shaft 114 of two adjacent contact units can pass through the connecting hole 33 to drive the rotating shaft 11 to rotate; each connecting wall 303 is opened with an assembly groove 31, and each assembly groove 31 is located near the opening, and the two assembly grooves 31 form a rotationally symmetrical structure about the axis of the connecting hole 33.

[0043] In this embodiment, the axial height of the rotating shaft 11 is greater than or equal to the interval between a pair of supporting walls 302, and two gate-breaking limiting portions 115 are protruding from the circumferential side wall of the rotating shaft 11. The two openings of the accommodating chamber are blocked by the rotating shaft 11 and the two gate-breaking limiting portions 115 to communicate with each other, that is, the two ends of the rotating shaft 11 are respectively rotatably abutted against the supporting walls 302, that is, the rotating surface of the rotating shaft 11 is rotatably abutted against the supporting walls 302; a gate-breaking blocking portion 32 is provided in the accommodating chamber, and the gate-breaking blocking portion 32 is located On the moving trajectory of the opening limit part 115, when the rotating shaft 11 rotates to the opening position, the opening limit part 115 cooperates with the opening barrier part 32 to limit the further rotation of the rotating shaft 11, wherein the thickness of the opening limit part 115 and / or the opening barrier part 32, or the overall thickness after the opening limit part 115 and the opening barrier are coordinated is equal to the distance between a pair of support walls 302, thereby realizing that the two openings of the barrier accommodating cavity are connected to each other, thereby having the effect of airtight guidance and increasing the creepage distance.

[0044] In this embodiment, the shell 3 includes two plate bodies 301 that are spaced apart and opposite to each other. The shapes of the two plate bodies 301 can be the same or different, but the two plate bodies 301 together form a hollow cavity with open ends, and the hollow cavity as a whole is a "□"-shaped cavity, with the hollow part of the hollow cavity serving as a accommodating cavity, wherein the two plate bodies 301 can be formed by "-" and "U" shapes respectively, or can be formed by two "U"-shaped plate bodies 301 together, or both plate bodies 301 can be "∟"-shaped.

[0045] like Figure 2 , 3 As shown in Figures 11 and 12, in this embodiment, each plate body 301 is preferably in a rectangular plate-like structure as a whole, and protruding extension portions 304 are provided on both sides of the plate surface of each plate body 301, so that each plate body 301 is in a "U" shape, and the extension portions 304 on the same side of the two plate bodies 301 cooperate to form a pair of connecting walls 303 of the shell 3, and the two extension portions 304 can be overlapped or butt-jointed to form the connecting wall 303, and the middle parts of the two plate bodies 301 are spaced apart and relative to each other to form a pair of supporting walls 302 of the shell 3.

[0046] A mutually cooperating splicing structure is provided between the two plate bodies 301, and the splicing structure includes at least one pair of mutually cooperating buckles 351 and slots 352, wherein one of the plate bodies 301 is provided with a slot 352 and / or a buckle 351, and the other plate body 301 is provided with a buckle 351 and / or a slot 352. In the present embodiment, a slot 352 is provided in the middle of two extension parts 304 of one of the plate bodies 301, and a buckle 351 is protruding in the middle of two extension parts 304 of the other plate body 301. When the two extension parts 304 are butt-jointed to form a connecting wall 303, the buckle 351 cooperates with the slot 352 to form a plug-in and disassembly structure, which facilitates the assembly of the rotating shaft 11 in the accommodating cavity.

[0047] A groove structure serving as a gate-breaking barrier portion 32 is provided on the edge of each extension portion 304. Each groove structure is an arc-shaped groove and its opening is inclined toward the adjacent shell 3, so that the edge of each extension portion 304 forms an "S" shape. The center line of each groove structure coincides with a partial moving trajectory of the gate-breaking limit portion 115. In the present embodiment, the two gate-breaking barrier portions 32 form a rotationally symmetrical structure about the center axis of the connecting hole 33.

[0048] An assembly groove 31 is provided in each connecting wall 303, and each static contact assembly 2 cooperates with the moving contact assembly 1 through the assembly groove 31, and the two assembly grooves 31 form a rotationally symmetrical structure about the central axis of the connecting hole 33. An assembly groove 31 and a gate-breaking barrier portion 32 are provided on the same connecting wall 303, that is, a static contact portion 21 and a gate-breaking barrier portion 32 are respectively located on the connecting walls 303 on both sides of the same opening of the shell 3. In the present embodiment, a groove structure is provided on the edge of each extension portion 304. When the two extension portions 304 are docked, the two groove structures cooperate to form the assembly groove 31, and the static contact assembly 2 can be clamped when the two extension portions 304 are docked, thereby achieving stable cooperation between the static contact assembly 2 and the shell 3.

[0049] It should be noted that, when the shell 3 is an integrated structure, a groove structure of the same shape may be provided on the side wall of the accommodating cavity near the opening of the shell 3 as the gate-breaking barrier 32 .

[0050] like Figure 2-6 As shown, the rotating shaft 11 is cylindrical as a whole, and the two dynamic contact portions 120 extend to the outside of the rotating shaft 11 along the radial direction of the rotating shaft 11 respectively. A gate-breaking limit portion 115 is protruded on the circumferential side wall of the rotating shaft 11. The thickness of each gate-breaking limit portion 115 is equal to the spacing between a pair of support walls 302. There are two gate-breaking limit portions 115 in the figure, and the two gate-breaking limit portions 115 form a rotationally symmetrical structure about the axis of the rotating shaft 11. Each gate-breaking limit portion 115 is adjacent to a dynamic contact portion 120 respectively to avoid a large interval between the gate-breaking limit portion 115 and the dynamic contact portion 120 to interfere with the rotation angle of the rotating shaft 11. When the rotating shaft 11 is rotated to the gate-breaking position, the gate-breaking limit portion 115 cooperates with the gate-breaking barrier portion 32. At this time, the rotating shaft 11 and the two gate-breaking limit portions 115 are blocked between the two openings of the accommodating cavity.

[0051] This embodiment provides a specific structure of a split shaft 11 . The shaft 11 includes a contact support 111 and a cover plate 112 covering the contact support 111 .

[0052] like Figure 6-8As shown, the contact support 111 is cylindrical as a whole, and a radial groove 1111 is provided on one side surface of the contact support 111, and both ends of the radial groove 1111 are open. The moving contact bridge 12 is assembled in the radial groove 1111, and both ends of the moving contact bridge 12 extend out of the contact support 111 to form two moving contact parts 120. Two transmission shafts 114 are protruded on both sides of the radial groove 1111, and the transmission shaft 114 can also provide a certain limit effect for the moving contact bridge 12; two driving shafts 114 are protruded on the circumferential side wall of the contact support 111. The two bosses are the bosses of the opening limiter 115, and the two bosses form a rotationally symmetrical structure about the axis of the contact support 111, and each boss is located on the side close to the opening of the radial groove 1111; a rotating part 113 is protrudingly provided on the other side surface of the contact support 111, and the rotating part 113 is located at the center of the contact support 111. The rotating part 113 is rotatably matched with a connecting hole 33 of a support wall 302, and a transmission groove 117 is respectively provided on both sides of the rotating part 113, and each transmission groove 117 is coaxial with the transmission shaft 114. It should be noted that the transmission shaft 114 can also be assembled on the contact support 111 alone, and the transmission shaft 114 can also be arranged in pairs, but the transmission shaft 114 is preferably located at a position deviating from the axis of the contact support 111, and the multiple transmission shafts 114 preferably form a rotationally symmetrical structure about the axis of the contact support 111.

[0053] like Figure 6 , 9As shown in Figure 10, the cover plate 112 is disc-shaped as a whole, and two through holes 1121 are provided in the middle of the cover plate 112. Each through hole 1121 is coaxial with the transmission shaft 114 of the contact support 111. When the cover plate 112 is covered on the contact support 111, each transmission shaft 114 passes through a corresponding through hole 1121 and then passes through the outside of the housing 3 from a connecting hole 33 of a support wall 302, and is used to be plugged into the transmission groove 117 of the adjacent moving contact assembly 1. The transmission shaft 114 is located at a position deviating from the axis of the rotating shaft 11, which is conducive to providing a stable linkage connection; two opening limiter portions 115 are protruding from the edge of the cover plate 112. Boss, and each boss located on the cover plate 112 corresponds one-to-one with the boss located on the contact support 111. In the present embodiment, the thickness of the gate-opening limiting portion 115 is equal to the interval between a pair of support walls 302. When the gate-opening limiting portion 115 cooperates with the gate-opening blocking portion 32, the rotating shaft 11 and the two gate-opening limiting portions 115 separate the two openings on both sides, thereby preventing the two openings from being connected to each other through the inside of the accommodating cavity; of course, it is also possible to set a boss as the gate-opening limiting portion 115 only on the cover plate 112 or the contact support 111, but the thickness of the gate-opening limiting portion 115 is preferably equal to the interval between a pair of support walls 302. It should be noted that after the cover plate 112 is covered on the contact support 111, the rotating part 113 and the transmission shaft 114 extend out from the two connecting holes 33 of the shell 3 respectively. At this time, the side of the contact support 111 facing away from the cover plate 112 and the side of the cover plate 112 facing away from the contact support 111 are respectively fitted with the two plate bodies 301, which can block the two openings in the accommodating cavity from connecting with each other.

[0054] The contact support 111 and the cover plate 112 of this embodiment are connected together by at least one snap-fitting member 13, that is, a snap-fitting groove 116 is respectively provided on one side edge of the contact support 111 facing away from the cover plate 112 and one side edge of the cover plate 112 facing away from the contact support 111. When the cover plate 112 covers the contact support 111, the snap-fitting member 13 is inserted into the snap-fitting groove 116 on the same side of the cover plate 112 and the contact support 111 after corresponding to each other, thereby connecting the contact support 111 and the cover plate 112 together. Figure 4-6 In the embodiment, the cover plate 112 and the contact support 111 are connected together by two snap members 13, and the two snap members 13 are symmetrically arranged on opposite sides of the rotating shaft 11, and the center line of the two snap members 13 is perpendicular to the center axis of the moving contact bridge 12, that is, the snap members 13, the snap grooves 116 and the transmission shaft 114 are located on the same diameter of the rotating shaft 11, and the diameter is perpendicular to the axis of the moving contact bridge 12.

[0055] In addition, the snap member 13 can be an integral structure with the cover plate 112 or the contact support 111. For example, the snap member 13 and the cover plate 112 are an integral structure, and the snap groove 116 is only provided at the edge of the contact support 111. Alternatively, the snap member 13 and the contact support 111 are an integral structure, and the snap groove 116 is only provided at the edge of the cover plate 112. It should be noted that the cover plate 112 and the contact support 111 can also be connected in other ways that are convenient for disassembly; in addition, the contact support 111 and the cover plate 112 can also be fixed by riveting with rivets, or welded by hot melting, ultrasonic welding or other processes.

[0056] The present embodiment provides a specific structure of an integrated rotating shaft 11 (not shown), the rotating shaft 11 comprises a cylindrical rotating body, the axial height of the rotating body in the present embodiment is equal to the spacing between a pair of supporting walls 302, a radial groove 1111 for assembling the moving contact bridge 12 is provided inside the rotating body, both ends of the radial groove 1111 penetrate the circumferential side wall of the rotating body, so that the two moving contact portions 120 of the moving contact can extend from the opening of the radial groove 1111 to the outside of the rotating body, a gate-breaking barrier portion 32 is protruded from the circumferential side wall of the rotating body, and each gate-breaking barrier portion 32 is adjacent to a moving contact bridge 12. Contact portion 120; a rotating portion 113 is protruded at the center position of one side of the rotating body, and the rotating portion 113 is rotatably matched with the connecting hole 33 of the shell 3. The rotating portion 113 is provided with at least one transmission groove 117, and the transmission groove 117 is located at a position deviated from the axis center, which is used for plugging with the transmission shaft 114 of the adjacent moving contact assembly 1; at least one transmission shaft 114 is protruded at the other side of the rotating body, and the transmission shaft 114 is located at a position deviated from the axis center of the rotating body. Preferably, the number of the transmission shafts 114 is two, and the two transmission shafts 114 form a rotationally symmetrical structure about the axis center of the rotating shaft 11.

[0057] In this embodiment, the moving contact bridge 12 can adopt the existing technology, and the moving contact parts 120 are respectively provided at both ends of the moving contact bridge 12. When the moving contact bridge 12 is assembled on the rotating shaft 11, each moving contact part 120 is adjacent to a gate opening limit part 115, and a moving contact part 120 and a gate opening limit part 115 move together between the static contact part 21 and the gate opening barrier part 32 on both sides of the same opening, and the gate opening limit part 115 is located on the side of the moving contact part 120 facing away from the static contact part 21.

[0058] like Figure 2 , 3As shown, each static contact assembly 2 includes a conductive plate. In the present embodiment, each conductive plate passes through a corresponding assembly slot 31 and is clamped under the action of two plate bodies 301. A static contact portion 21 is provided at one end of the conductive plate, and the static contact portion 21 extends into the accommodating cavity for cooperation with the dynamic contact portion 120. The two static contact portions 21 are spaced apart in the accommodating cavity and form a rotationally symmetrical structure about the axis of the rotating shaft 11 (connecting hole 33). A wiring portion 22 is provided at the other end of the conductive plate, and each wiring portion 22 is located outside the shell 3 for connection with the wiring assembly.

[0059] In addition, if Fig.13 As shown, an arc extinguishing system can also be arranged in each contact unit, and the arc extinguishing system includes an arc extinguishing chamber 40, which cooperates with the contact mechanism a to extinguish the arc generated by the disconnection of the contact mechanism a, and the arc entrance port of each arc extinguishing system is respectively connected to an open port of the shell 3.

[0060] 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 accompanying 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 limiting 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.

[0061] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is 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 (1) and a pair of stationary contact assemblies (2), wherein the moving contact assembly (1) comprises a rotating shaft (11) and a moving contact bridge (12) arranged on the rotating shaft (11), and moving contact portions (120) are respectively arranged at both ends of the moving contact bridge (12), and the stationary contact assembly (2) comprises a stationary contact portion (21), characterized in that: The moving contact assembly (1) also includes a shell (3), the housing cavity of the shell (3) is provided with two opposite openings, a pair of static contact assemblies (2) are arranged on the shell (3) so that the two static contact parts (21) are spaced and opposite to each other in the housing cavity, the rotating shaft (11) is rotatably arranged between the two static contact parts (21), each moving contact part (120) is in contact with or separated from a static contact part (21), and the moving contact assembly (1) cooperates with the housing cavity to block the two openings from being connected to each other.

2. The contact mechanism according to claim 2, characterized in that: Two gate-opening limiter portions (115) are protruding from the circumferential side wall of the rotating shaft (11). When the rotating shaft (11) rotates to the gate-opening position, the two gate-opening limiter portions (115) abut against the inner wall of the housing (3) to prevent the two openings from being connected to each other.

3. The contact mechanism according to claim 2, characterized in that: The two pairs of shell (3) side walls connected between the two openings are respectively a pair of connecting walls (303) and a pair of supporting walls (302); the connecting walls (303) are adjacent to the supporting walls (302); each connecting wall (303) is provided with an assembly groove (31); each assembly groove (31) corresponds to a fixed position assembly of a stationary contact assembly (2); the rotating shaft (11) is rotatably supported between the pair of supporting walls (302); and each moving contact portion (120) rotates between the pair of connecting walls (303).

4. The contact mechanism according to claim 2, characterized in that: Each of the opening gate limiting portions (115) is adjacent to a moving contact portion (120), and the two opening gate limiting portions (115) form a rotationally symmetrical structure about the axis of the rotating shaft (11).

5. The contact mechanism according to claim 2 or 4, characterized in that: A gate-breaking barrier portion (32) is arranged in the accommodating chamber, and the gate-breaking barrier portion (32) is located on the track of the gate-breaking limit portion (115). The gate-breaking barrier portion (32) cooperates with and abuts against the gate-breaking limit portion (115) to block the two openings from being connected to each other.

6. The contact mechanism according to claim 5, characterized in that: The gate-opening barrier portions (32) are respectively located on a pair of connecting walls (303).

7. The contact mechanism according to claim 6, characterized in that: A static contact portion (21) and a gate-opening barrier portion (32) are respectively located on two side connecting walls (303) of a common opening of a housing (3); a dynamic contact portion (120) and a gate-opening limiting portion (115) rotate together between a static contact portion (21) and a gate-opening barrier portion (32); and a gate-opening limiting portion (115) is located on a side of a dynamic contact portion (120) that is opposite to the static contact portion (21).

8. The contact mechanism according to claim 3, characterized in that: The stationary contact assembly (2) comprises a conductive plate, the conductive plate is limitedly passed through the assembly slot (31), one end of the conductive plate located in the accommodating cavity is provided with a stationary contact portion (21), and one end of the conductive plate located outside the housing (3) is provided with a wiring portion (22).

9. A contact unit, comprising a housing (5), characterized in that: A contact mechanism (a) according to any one of claims 1 to 8 is arranged in the middle of the housing (5).

10. The contact unit according to claim 9, characterized in that: Two arc extinguishing systems are also arranged in the shell (5), the contact mechanism (a) is located between the two arc extinguishing systems, and the arc entry port of each arc extinguishing system is respectively connected to an opening of the shell (3).

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