Contact system, switch unit, and electric switch device

Abstract

The present invention relates to the field of low-voltage electrical appliances, and more particularly, to a contact system and a switching electrical appliance including the contact system, wherein the contact system includes a main contact structure and secondary contact structures, which are pivotally arranged respectively and rotate synchronously, and two groups of secondary contact structures are arranged on both radial sides of the main contact structure and synchronously connected with or disconnected from the main contact structure. The contact system has a fast breaking speed, large opening distance and strong breaking capacity.

Description

[0001] The present application claims priority to Chinese Patent Application 202310650272.5 filed on June 03, 2023, which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] The present invention relates to the field of low-voltage electrical appliances, and more particularly, to a contact system, a switching unit including the contact system, and a switching electrical appliance including the contact system.BACKGROUND

[0003] A switching electrical appliance includes a contact system for breaking and turn-on of a circuit, and an opening distance of the contact system is closely related to the breaking capacity of the switching electrical appliance. The existing contact system is implemented by the combination of moving and static contacts. In the context of the increasing miniaturization of switching electrical appliances, an opening distance and a breaking speed of a contact system implemented by moving and static contacts cannot be greatly increased within a limited space, which directly affects the improvement of the breaking capacity of the switching electrical appliance and, especially when used to break a DC voltage, seriously affects current carrying and breaking capacities of the switching electrical appliance. In addition, the structure and assembly operation of a moving contact in the existing switching electrical appliance are complex. In addition, the internal layout of the existing switching electrical appliance is interlaced and complex, resulting in a short-circuit risk.SUMMARY

[0004] An object of the present invention is to overcome at least one defect of the prior art and to provide a contact system and a switching electrical appliance, where the contact system has a fast breaking speed, large opening distance and strong breaking capacity; further provides a switching unit including the contact system and having a strong breaking capacity; and further provides a switching electrical appliance including the contact system and having a reasonable and compact internal layout and strong breaking capacity.

[0005] In order to achieve the above objective, the present invention provides the following technical solution: a contact system, comprising a main contact structure and secondary contact structures, which are pivotally arranged respectively and rotate synchronously, in which two groups of secondary contact structures are arranged on both radial sides of the main contact structure and synchronously connected with or disconnected from the main contact structure.

[0006] Further, the main contact structure is connected to the two groups of secondary contact structures in a transmission manner, respectively; the two groups of secondary contact structures rotate synchronously in the same direction; and the secondary contact structures rotate in synchronization with the main contact structure in opposite directions.

[0007] Further, the main contact structure comprises a main gear, and each secondary contact structure comprises a secondary gear engaged with the main gear.

[0008] Further, the rotation axes of the main contact structure and the two groups of secondary contact structures are arranged in parallel and are all located on a first plane.

[0009] Further, the two groups of secondary contact structures are of mutually centrosymmetric structures with a rotation center of the main contact structure as a symmetry center.

[0010] A switching unit, comprising the contact system, a housing, an arc extinguishing system, a first wiring terminal and a second wiring terminal, in which the contact system and the arc extinguishing system are arranged in the housing; the two groups of secondary contact structures of the contact system are first secondary contact structures and second secondary contact structures, respectively, and the first secondary contact structures and the second secondary contact structures are electrically connected to the first wiring terminal and the second wiring terminal, respectively; the arc extinguishing system comprises two groups of arc extinguishing chambers which are arranged on both radial sides of the main contact structure; one group of arc extinguishing chambers are arranged on a switch-on and switch-off path of the first secondary contact structures and the main contact structure; and the other group of the arc extinguishing chambers are arranged on a switch-on and switch-off path of the second secondary contact structures and the main contact structure.

[0011] Further, the rotation axes of the main contact structure and the two groups of secondary contact structures are arranged in parallel and are all located on a first plane; and the two groups of arc extinguishing chambers are arranged on both sides of the first plane.

[0012] Further, the housing comprises a main cavity, and the contact system and the arc extinguishing system are arranged in the main cavity.

[0013] Further, the housing further comprises a first terminal cavity and a second terminal cavity, and the first terminal cavity, the main cavity and the second terminal cavity are arranged in sequence and separated; the first wiring terminal is arranged in the first terminal cavity, and the second wiring terminal is arranged in the second terminal cavity; or the first wiring terminal, one group of arc extinguishing chambers, the second wiring terminal and the other group of arc extinguishing chambers are arranged around the contact system along a rotation direction of the main contact structure; the first wiring terminal and the second wiring terminal are arranged on a pair of opposite side walls of the main cavity of the housing, respectively; and the first wiring terminal and the second wiring terminal are at least partially inserted into the main cavity, respectively, and are electrically connected to the two groups of secondary contact structures, respectively.

[0014] Further, both ends of each group of arc extinguishing chambers extend to an switch-off position and a switch-on position of the corresponding secondary contact structure; each arc extinguishing chamber comprises at least two arc extinguishing chamber modules, all of which are arranged sequentially along the rotation direction of the main contact structure to form the arc extinguishing chamber; or each arc extinguishing chamber comprises partitions and grids, wherein a plurality of grids are arranged side by side along the rotation direction of the main contact structure, and are located between two partitions which are opposite each other, and both ends of each grid are fixedly connected to the two partitions.

[0015] A switching electrical appliance, comprising the contact system, a housing, an operating mechanism, a first wiring terminal and a second wiring terminal, wherein the contact system, the operating mechanism, the first wiring terminal and the second wiring terminal are arranged in the housing, and the operating mechanism is used to drive the contact system to be switched on or off; the first wiring terminal, the contact system and the second wiring terminal are arranged sequentially along a first direction d1; the operating mechanism and the contact system are arranged sequentially along a second direction d2, and the first direction d1 and the second direction d2 are perpendicular to each other; the main contact structure and the secondary contact structures are pivotally arranged on the housing, respectively; and the two groups of secondary contact structures are electrically connected to the first wiring terminal and the second wiring terminal, respectively.

[0016] Further, the operating mechanism comprises a handle and a transmission link which are pivotally arranged on the housing, and the handle is connected to the main contact structure or any of the secondary contact structures in a transmission manner through the transmission link; and the housing comprises a first terminal cavity, a main cavity and a second terminal cavity which are arranged in sequence and separated along the first direction d1, and an operating cavity spaced from the main cavity along the second direction d2; and the first wiring terminal is arranged in the first terminal cavity, the second wiring terminal is arranged in the second terminal cavity, the contact system and the arc extinguishing system are arranged in the main cavity, and the operating mechanism is arranged in the operating cavity.

[0017] Further, the operating mechanism comprises a lever mechanism; the lever mechanism comprises a locking fastener and a tripping member which are pivotally arranged respectively and are in snap fit with each other; and the tripping member is driven by an external force to rotate, so as to release the snap fit from the locking fastener, so that the switching electrical appliance is tripped and switched-off.

[0018] Further, the switching electrical appliance comprises an overcurrent protection mechanism, in which the overcurrent protection mechanism is used to drive the tripping member to rotate so as to release the snap fit from the locking fastener when a short-circuited and / or overloaded fault occurs in a circuit where the switching electrical appliance is located; the lever mechanism and the overcurrent protection mechanism are arranged side by side along the first direction d1; and the overcurrent protection mechanism and the contact system are arranged side by side along the second direction d2.

[0019] Further, the operating mechanism comprises a handle pivotally arranged on the housing, a front link, a rear link, and a rotating plate pivotally arranged on the housing, in which the handle is connected to the lever mechanism in a transmission manner through the front link; the locking fastener and the tripping member are pivotally arranged on the rotating plate, respectively; the rotating plate is connected to the main contact structure or any of the secondary contact structures in a transmission manner; and

[0020] the housing comprises a first terminal cavity, a main cavity and a second terminal cavity which are arranged in sequence and separated along the first direction d1, and an operating cavity spaced from the main cavity along the second direction d2; and the first wiring terminal is arranged in the first terminal cavity, the second wiring terminal is arranged in the second terminal cavity, the contact system and the arc extinguishing system are arranged in the main cavity, and the operating mechanism and the overcurrent protection mechanism are arranged in the operating cavity.

[0021] The contact system of the present invention has dual break points due to pivotal arrangement between a main contact structure and secondary contact structures, and can achieve a relatively large opening distance between the main contact structure and the secondary contact structures since the main contact structure and the secondary contact structures rotate at a relatively small angle, both of which can significantly improve the breaking capacity of the contact system since the contact system breaks faster.

[0022] In addition, rotation axes of the two groups of the secondary contact structures are located on both sides of a rotation axis of the main contact structure and are spaced in parallel from the rotation axis of the main contact structure, and all of the three axes are located in a first plane, which is conducive to maximizing an insulation gap and a creepage distance between the two groups of secondary contact structures and improving the insulation performance.

[0023] In addition, the two groups of secondary contact structures are mutually centrosymmetric structures, which reduce the number of parts.

[0024] The switching unit of the present invention includes the contact system. The contact system has dual break points due to pivotal arrangement between the main contact structure and the secondary contact structures, and can achieve a relatively large opening distance between the main contact structure and the secondary contact structures since the main contact structure and the secondary contact structures rotate at a relatively small angle, both of which can significantly improve the breaking capacity of the switching unit since the contact system breaks faster. Moreover, an arc extinguishing system of the switching unit further improves the breaking capacity of the switching unit.

[0025] The switching electrical appliance of the present invention includes the contact system. The contact system of the present invention has dual break points due to pivotal arrangement between the main contact structure and the secondary contact structures, and can achieve a relatively large opening distance between the main contact structure and the secondary contact structures since the main contact structure and the secondary contact structures rotate at a relatively small angle, both of which can significantly improve the breaking capacity of the switching electrical appliance since the contact system breaks faster. Moreover, the switching electrical appliance has a reasonable internal layout, which not only effectively controls the overall specification volume of the switching electrical appliance, but also simplifies an internal circuit connection structure while ensuring the internal insulation performance of the switching electrical appliance.

[0026] In addition, the operating mechanism and the contact system are respectively arranged in different spaces, which increases an insulation gap and a creepage distance between the operating mechanism and the contact system, and ensures the personal safety of operators.BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1.0 is a schematic structural diagram of a contact system of the present invention; FIG. 1.1 is a schematic structural diagram of a switching electrical appliance, preferably an isolation switch, of the present invention in a switched-off state; FIG. 1.2 is a schematic structural diagram of a switching electrical appliance, preferably an isolation switch, of the present invention in a switched-on state; FIG. 2 is a schematic structural diagram of a switching electrical appliance, preferably an isolation switch, of the present invention, from which a support cover of a main support is removed compared to FIG. 1; FIG. 3 is a schematic structural diagram of a main contact structure in the present invention from two perspectives; FIG. 4 is an exploded view of the main contact structure in the present invention from two perspectives; FIG. 5 is a schematic structural diagram of a support base in the present invention; FIG. 6 is a schematic structural diagram of a secondary contact structure in the present invention; FIG. 7 is a schematic sectional view of the secondary contact structure in the present invention; FIG. 8 is a schematic structural diagram of a secondary support in the present invention; FIG. 9 is a schematic structural diagram of a secondary contact in the present invention; FIG. 10.1 is a schematic structural diagram of a switching electrical appliance, preferably a rotary isolation switch, of the present invention in a switched-off state, showing an implementation of a switching unit; FIG. 10.2 is a schematic structural diagram of a switching electrical appliance, preferably a rotary isolation switch, of the present invention in a switched-on state, including the same switching unit as shown in FIG. 10.1; FIG. 11.1 is a schematic structural diagram of a switching electrical appliance, preferably a rotary isolation switch, of the present invention in a switched-off state, showing another implementation of a switching unit; FIG. 11.2 is a schematic structural diagram of a switching electrical appliance, preferably a rotary isolation switch, of the present invention in a switched-on state, including the same switching unit as shown in FIG. 11.1; FIG. 12 is a schematic structural diagram of a switching electrical appliance, preferably a rotary isolation switch, of the present invention, showing a third implementation of a switching unit; FIG. 13.1 is a schematic structural diagram of a switching electrical appliance, preferably a circuit breaker, of the present invention in a switched-off state; and FIG. 13.2 is a schematic structural diagram of a switching electrical appliance, preferably a circuit breaker, of the present invention in a switched-on state.

[0028] Reference symbols represent the following components: 1-housing; 1-0-main cavity; 1-1-first terminal cavity; 1-2-second terminal cavity; 1-3-separating rib; and 1-4-operating cavity; 2-main contact structure; 21-main contact; 214-positioning groove; 23-main support; 231-support base; 2311-support base positioning protrusion; 2312-plug-in hole; 2313-support base hinge; 232-support cover; 2321-support cover positioning protrusion; 2322-plug-in column; 2323-support cover hinge; 233-sector gear; 234-main contact slot; 235-connecting column; 236-connecting hole; and 237-extension; 3-secondary contact structure; 3a-first secondary contact structure; 31-secondary contact; 310-secondary contact inner segment; 311-secondary contact outer segment; 310-311-secondary contact step surface; 312-secondary contact limiting protrusion; 31a-first secondary contact; 3b-second secondary contact structure; 31b-second secondary contact; 32-secondary support; 320-secondary contact jack; 322-secondary gear; 33-secondary spring; 331-stationary arm; 332-moving arm; 324-retaining surface; 325-secondary contact positioning surface; 326-limiting portion; 32a-first secondary support; and 32b-second secondary support; 4-arc-extinguishing chamber; 5-first wiring terminal; 6-second wiring terminal; 7-handle; 8-transmission link; 9-overcurrent protection mechanism; 10-front link; 11-lever mechanism; 11-1-rotating plate; 11-2-locking fastener; and 11-3 tripping member; 12-rear link; 51-first conductor; and 61-second conductor. DETAILED DESCRIPTION

[0029] The specific implementation of a switching electrical appliance of the present invention will be further described below in conjunction with the embodiments given in accompanying drawings. The switching electrical appliance of the present invention is not limited to the description of the following embodiments.

[0030] As shown in FIGS. 1.0-2, and 10.1-13.2, the switching electrical appliance of the present invention includes a housing 1, and a first wiring terminal 5, a contact system and a second wiring terminal 6 which are connected sequentially in series; and the contact system is connected and disconnected to switch a circuit where the switching electrical appliance is located on and off, and the first wiring terminal 5 and the second wiring terminal 6 are used to connect the switching electrical appliance into the corresponding circuit.

[0031] As shown in FIGS. 1.0-13.2, an embodiment of the contact system is shown.

[0032] As shown in FIGS. 1.0-2, and 10.1-13.2, the contact system includes a main contact structure 2 and secondary contact structures 3, which are pivotally arranged respectively and rotate synchronously, wherein two groups of secondary contact structures 3 are arranged on both radial sides of the main contact structure 2 and synchronously connected with or disconnected from the main contact structure 2. When the two groups of secondary contact structures 3 are connected with the main contact structure 2, they are connected sequentially in series. Further, the main contact structure 2 and the secondary contact structures 3 rotate synchronously to face each other and are connected (that is, the main contact structure 2 and the secondary contact structures 3 rotate synchronously so that contact points of the main contact structure 2 and the secondary contact structures 3 are close to each other and connected) or rotate synchronously to move away from each other and are disconnected (that is, the main contact structure 2 and the secondary contact structures 3 rotate synchronously so that the contact points of the main contact structure 2 and the secondary contact structures 3 move away from each other and are disconnected). Specifically, the main contact structure 2 and the secondary contact structures 3 are pivotally arranged on the housing 1, respectively.

[0033] Further, the two groups of secondary contact structures 3 are electrically connected to the first wiring terminal 5 and the second wiring terminal 6, respectively. Further, the first wiring terminal 5 is electrically connected to one group of secondary contact structures 3 (i.e., first secondary contact structures 3a) through a first conductor 51, directly or indirectly; and the second wiring terminal 6 is electrically connected to the other group of secondary contact structures 3 (i.e., second secondary contact structures 3b) through a second conductor 61, directly or indirectly. Further, the first conductor 51 and the second conductor 61 are both flexible connections, and the first conductor 51 and the second conductor 61 are electrically connected to the corresponding secondary contact structures 3, directly.

[0034] Further, the main contact structure 2 includes a main contact 21, each secondary contact structure 3 includes a secondary contact 31, and both ends of the main contact 21 are used to be connected with and disconnected from two groups of secondary contacts 31, such that the contact system is connected and disconnected, thereby switching a circuit in which the switching electrical appliance is located on and off.

[0035] The contact system in the present embodiment has dual break points due to pivotal arrangement between the main contact structure 2 and the secondary contact structures 3, and can achieve a relatively large opening distance between the main contact structure 2 and the secondary contact structures 3 since the main contact structure 2 and the secondary contact structures 3 rotate at a relatively small angle, both of which can significantly improve the breaking capacity of the contact system since the contact system breaks faster.

[0036] As shown in FIGS. 1.0-2, and 10.1-13.2, the two groups of secondary contact structures 3 rotate synchronously in the same direction, and the secondary contact structures 3 rotates in synchronization with the main contact structure 2 in opposite directions. In other words, when the secondary contact structures 3 are connected with the main contact structure 2, the two secondary contact structures 3 rotate synchronously in a third direction, and meanwhile, the main contact structure 2 rotates in a fourth direction, wherein the third direction and the fourth direction are opposite to each other; and when the secondary contact structures 3 are disconnected from the main contact structure 2, the two secondary contact structures 3 rotate synchronously in the fourth direction, and meanwhile, the main contact structure 2 rotates in the third direction. Specifically, as shown in FIGS. 1.0-2, and 10.1-13.2, the third direction is a counterclockwise direction, and the fourth direction is a clockwise direction.

[0037] As shown in FIGS. 1.0-2, and 10.1-13.2, the rotation axes of the main contact structure 2 and the two groups of secondary contact structures 3 are arranged in parallel and are all located on a first plane. In other words, the rotation axes of the main contact structure 2 and the two groups of secondary contact structures 3 are coplanar, and the rotation axes of the two groups of secondary contact structures 3 are located on both sides of the rotation axis of the main contact structure 2 and are spaced in parallel, which is conducive to maximizing an insulation gap and a creepage distance between the two groups of secondary contact structures 3 and improving the insulation performance.

[0038] As shown in FIGS. 1.0-2, and 10.1-13.2, the main contact structure 2 is connected to the two groups of secondary contact structures 3 in a transmission manner, respectively. In other words, when any one of the main contact structure 2 and the two groups of secondary contact structures 3 is driven by an external force (e.g., a driving force provided by the operating mechanism of the switching electrical appliance, and the operating mechanism will be explained later) to rotate, and the remaining two structures may both be driven to rotate. Specifically, when the main contact structure 2 is driven by an external force to rotate, the two groups of secondary contact structures 3 are respectively driven to rotate synchronously; or when any of the secondary contact structures 3 is driven by an external force to rotate, this secondary contact structure 3 drives the main contact structure 2 to rotate synchronously, and meanwhile, the main contact structure 2 drives the other secondary contact structure 3 to rotate synchronously.

[0039] As shown in FIGS. 1.0-2, 7, and 10.1-13.2, an implementation in which the main contact structure 2 is connected to the secondary contact structures 3 in a transmission manner is shown: the main contact structure 2 includes a main gear, and each secondary contact structure 3 includes a secondary gear 322 meshed with the main gear, that is, the two secondary gears 322 are respectively meshed with the main gear, and if any of the three gears rotates, the other two gears can be driven to rotate synchronously.

[0040] Of course, the transmission connection between the main contact structure 2 and the secondary contact structures 3 is not merely limited to the above implementation. For example, the main contact structure 2 is provided with driving arms, the driving arms are parallel to the rotation axis of the main contact structure 2, each secondary contact structure 3 is provided with a corresponding kidney-shaped driven hole, and the driving arms are inserted into the kidney-shaped driven holes. The cooperation method and principle of the driving arms and the driven holes are conventional technical means in the art, and will not be described here. In other words, all methods for implementing the transmission connection between the main contact structure 2 and the secondary contact structures 3 shall fall within the protection scope of the present application.

[0041] As shown in FIGS. 1.0-8, and 10.1-13.2, the main contact structure 2 includes a main support 23 which is pivotally arranged and a main contact 21 arranged on the main support 23, each secondary contact structure 3 includes a secondary support 32 which is pivotally arranged and a secondary contact 31 arranged on the secondary support 32, and both ends of the main contact 21 are used to be connected with and disconnected from the two secondary contacts 31. Further, the main gear includes two groups of sector gears 233 which are arranged on both radial sides of the main support 23 and coaxial with the main contact structure 2, and the two groups of sector gears 233 are meshed with the secondary gears 322 on the two groups of secondary contact structures 3.

[0042] As shown in FIGS. 3-5, the main support 23 includes a main contact jack formed in the middle, the main contact 21 is inserted into the main contact jack and both ends of the main contact protrude out of both radial sides of the main support 23, and the main contact 21 is also in limiting fit with the main support 23 to prevent the main contact 21 from moving along the main contact jack, so as to ensure the reliable connection between both ends of the main contact 21 and the two groups of secondary contacts 31.

[0043] As shown in FIGS. 3-5, the main support 23 includes a support cover 232 and a support base 231 which are oppositely spliced along its axial direction (in the same axial direction as a hinge of the main contact structure 2), the support base 231 is provided with a main contact slot 234, and the support cover 232 covers the main contact slot 234 to form the main contact jack. The structure of the main support 23 simplifies the structure and the assembly operation of the main contact structure 2.

[0044] As other embodiments, the main contact jack is formed by oppositely splicing two half grooves, which are respectively formed on the support base 231 and the support cover 232, along a circumferential direction of the main support 23.

[0045] Further, the two groups of sector gears 233 of the main gear are arranged on both radial sides of the support base 231.

[0046] Further, the main support 23 includes positioning protrusions which are arranged on an inner side wall of the main contact jack, the main contact 21 includes positioning grooves 214 formed thereon, and the positioning protrusions are in limiting fit with the positioning grooves 214 to prevent the main contact 21 from moving along the main contact jack. Further, each positioning protrusion includes a support base positioning protrusion 2311 arranged on a bottom wall of the main contact slot 234 and / or a support cover positioning protrusion 2321 arranged on the support cover 232, and a side edge of the main contact 21 that faces the bottom wall of the main contact slot 234 and / or a side edge of the main contact 21 that faces the support cover 232 are / is provided with the positioning grooves 214. In other words, the support base positioning protrusion 2311 and the support cover positioning protrusion 2321 can be provided alternatively or simultaneously, and the two positioning grooves 214 are also correspondingly provided alternatively or simultaneously.

[0047] Further, the support base 231 further includes two extensions 237, wherein the two extensions 237 are arranged to protrude from both radial sides of the support base 231, and both ends of the main contact slot 234 are arranged in the two extensions 237. The two extensions 237 extend the length of the main contact slot 234, increase the length of a part of the main contact 21 that matches the main contact slot 234, ensure the reliability of assembly, reduce a part of the main contact 21 that protrudes out of the main support 231, reduce the possibility of bending of the main contact 21, and also increases an insulation gap and a creepage distance between the main contact 21 and the secondary contacts 31 after they are disconnected. Further, each extension 237 has a U-shaped cross-sectional structure, and encloses the main contact 21.

[0048] As shown in FIGS. 3-4, the main support 23 includes main support joints which are arranged at both axial ends thereof. Further, the two main support joints are a support base joint 2313 arranged on the support base 231 and a support cover joint 2323 arranged on the support cover 232, respectively.

[0049] As shown in FIG. 4, the main support 23 further includes a plug-in structure. The plug-in structure includes plug-in columns 2322 and plug-in holes 2312, one of which are arranged on the support cover 232, and the other of which are arranged on the support base 231. Specifically, the plug-in columns 2322 are arranged on a side of the support cover 232 facing the support base 231, and the plug-in holes 2312 are formed in an end of the support base 231 facing the support cover 232; and when the support base 231 and the support cover 232 are spliced, the plug-in columns 2322 are inserted into the plug-in holes 2312. Further, the two plug-in columns 2322 are spaced side by side on the support cover 232, and the two plug-in holes 2312 are spaced side by side on the support base 231.

[0050] As shown in FIGS. 3-4, the main support 23 further includes a connecting column 235 and a connecting hole 236 which are arranged at both axial ends thereof. When a plurality of contact systems are used in linkage side by side along an axial direction of a joint of the main contact structure 2, in two adjacent groups of main supports 23, the connecting column 235 of one main support 23 is in plug-in fit with the connecting hole 236 of the other main support 23, such that the two main supports 235 rotate synchronously. Further, the connecting column 235 is a polygonal column, and the connecting hole 236 is a polygonal hole.

[0051] As other embodiments, when the plurality of contact supports are used in linkage side by side along the axial direction of the joint of the main contact structure 2, the main supports 23 are connected in a transmission manner via at least one linkage shaft, and the linkage shaft and the rotation axis of the main contact structure 2 are spaced in parallel.

[0052] It should be pointed out that the above structure for implementing the side-by-side linkage of a plurality of groups of contact systems can be provided or canceled as needed. For example, when only one group of contact systems is provided for the switching electrical appliance, it is canceled; and when a plurality of groups of contact systems which are arranged in linkage side by side are provided for the switching electrical appliance, it is provided.

[0053] As shown in FIGS. 1.0-2, and 10.1-13.2, in the two groups of secondary contact structures 3, one group is first secondary contact structures 3a electrically connected to the first wiring terminal 5, and the other group is second secondary contact structures 3b electrically connected to the second wiring terminal 6; the secondary support 32 and the secondary contact 31 of each first secondary contact structure 3a are a first secondary support 32a and a first secondary contact 31a, respectively, and the secondary support 32 and the secondary contact 31 of each second secondary contact structure 3b are a second secondary support 32b and a second secondary contact 31b, respectively; and the first secondary support 32a and the second secondary support 32b are respectively connected to the main support 23 in a transmission manner, and the first secondary contact 31a and the second secondary contact 31b are connected with and disconnected from both ends of the main contact 21.

[0054] As shown in FIGS. 1.0-2, and 10.1-13.2, the two groups of secondary contact structures 3 are of mutually centrosymmetric structures with a rotation center of the main contact structure 2 as a symmetry center.

[0055] As shown in FIGS. 6-9, an embodiment of each secondary contact structure 3 is shown.

[0056] As shown in FIGS. 6-7, the secondary contact structure 3 includes a secondary support 32 which is pivotally arranged and a secondary contact 31 arranged on the secondary support 32, wherein the secondary contact 31 swings under the drive of the secondary support 32 and is connected with or disconnected from the main contact 2, one end of the secondary contact 31 is arranged on the secondary support 32, and the other end of the secondary contact 31 is connected with and disconnected from the main contact 21.

[0057] As shown in FIG. 7, the secondary contact 31 is arranged to rotate relative to the secondary support 32. The secondary contact structure 3 further includes a secondary spring 33. The secondary spring 33 is arranged between the secondary contact 31 and the secondary support 32. The secondary spring 33 provides an overtravel force when the secondary contact 31 is connected with the main contact 21. In other words, the secondary spring 33 makes the secondary contact 31 keep limiting fit and relative stationary with the secondary support 32; before the secondary support 32 drives the secondary contact 31 to rotate such that the secondary contact 31 is in initial contact with the main contact 21, the secondary contact 31 and the secondary support 32 keep acting synchronously; and after the secondary contact 31 is in contact with the main contact 21, the secondary support 32 will continue to rotate at a certain angle in an original direction. In this case, the secondary contact 31 rotates relative to the secondary support 31 and overtravel occurs, the secondary contact 31 compresses the secondary spring 33. Then, the secondary spring 33 exerts an overtravel force to the secondary contact 31, so that the secondary contact 31 presses the main contact 21 to ensure the reliable connection between the secondary contact 31 and the main contact 21.

[0058] As shown in FIGS. 7-8, the secondary support 32 includes a secondary contact jack 320 formed in the middle, wherein one end of the secondary contact 31 is inserted into the secondary contact jack 320, and the other end of the secondary contact 31 protrudes out of the secondary support 32, and is connected with or disconnected from the main contact 21. Further, the secondary spring 33 is a torsion spring which is arranged in the secondary contact jack 320, wherein one spring arm is a stationary arm 331 which is fit with the secondary contact 31, and the other spring arm is a moving arm 332 which is fit with a side wall of the secondary contact jack 320. When the secondary contact 31 rotates relative to the secondary support 32 after being in contact with the main contact 21, the secondary contact 31 presses the moving arm to compress the torsion spring, so that the secondary spring 33 stores energy.

[0059] Further, as shown in FIGS. 7 and 9, the secondary contact 31 includes a secondary contact limiting protrusion 312. One end of the secondary spring 33 is in limiting fit with the secondary contact limiting protrusion 312 to prevent the secondary contact 31 from escaping from the secondary contact jack 320, thereby ensuring the stability of the secondary contact 31 during assembly. Specifically, one spring arm of the secondary spring 33 includes a limiting segment, which is located between the secondary contact limiting protrusion 312 and an inlet of the secondary contact jack 320 and is in limiting fit with the secondary contact limiting protrusion 312 to prevent the secondary contact 31 from escaping from the secondary contact jack 320.

[0060] Further, as shown in FIG. 7, the secondary contact jack 320 includes a retaining surface 324 arranged at an inlet thereof, and a free end of a spring arm of the secondary spring 33, which is fit with an inner side wall of the secondary contact jack 320 is in limiting fit with the retaining surface to prevent the secondary spring 33 from escaping from the secondary contact jack 320. In other words, a free end of the stationary arm of the secondary spring props against the retaining surface 324.

[0061] As shown in FIGS. 6 and 8, the secondary support 32 further includes a limiting portion 326, the limiting portion 326 is arranged outside the inlet of the secondary contact jack 320, and the secondary spring 33 makes the secondary contact 31 prop against the limiting portion 326. The limiting portion 326 increases the length of a part of the secondary contact 31 which is fit with the secondary support 32, ensures the installation reliability of the secondary contact 31, and increases a force arm of the secondary spring 33 acting on the secondary contact 31. When the secondary contact 31 rotates relative to the secondary support 32, a free end of the limiting portion 326 is taken as a fulcrum, which is conducive to increasing the overtravel force and ensuring the reliability of connection between the secondary contact 31 and the main contact 21.

[0062] As shown in FIGS. 7-9, the secondary contact 31 includes a secondary contact inner segment 310 and a secondary contact outer segment 311 which are connected sequentially, and a secondary contact step surface 310-311 is formed at the connection between the secondary contact inner segment 310 and the secondary contact outer segment 311; and the secondary support 32 further includes secondary contact positioning surfaces 325 arranged on both sides of the inlet of the secondary contact jack 320, and the secondary contact positioning surface 325 is in relative limiting fit with the secondary contact step surface 310-311 to limit the depth of the secondary contact 31 inserted into the secondary contact jack 320, thereby ensuring the accuracy of the assembly of the secondary contact 31.

[0063] As shown in FIGS. 1.1-2, and 10.1-13.2, the switching electrical appliance of the present invention is preferably a rotary isolation switch, which includes at least one switching unit. The switching unit includes a housing 1 and a contact system arranged in the housing 1. Further, the rotary isolation switch further includes an operating mechanism. The operating mechanism and the switching unit are arranged side by side along the axial direction of the joint of the main contact structure 2. The operating mechanism is connected to the main contact structure 2 in a transmission manner to drive the contact system to be connected and disconnected.

[0064] In the rotary isolation switch in the present embodiment, the first wiring terminal 5 and the second wiring terminal 6 are both electrically connected to an external circuit board; or one of the first wiring terminal 5 and the second wiring terminal 6 is connected to the external circuit board and the other is electrically connected to an external conductor; or the first wiring terminal 5 and the second wiring terminal 6 are both electrically connected to the external conductor.

[0065] The switching unit further includes an arc extinguishing system. The arc extinguishing system includes two groups of arc extinguishing chambers 4 arranged on both radial sides of the main contact structure 2, wherein one group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the first secondary contact structures 3a and the main contact structure 2, and the other group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the second secondary contact structures 3b and the main contact structure 2. In other words, one group of secondary contact structures 3 (the first secondary contact structures 3a) and the main contact structure 2 are in relative fit with one group of arc extinguishing chambers 4; and the other group of secondary contact structures 3 (the second secondary contact structures 3b) and the main contact structure 2 are in relative fit with the other group of arc extinguishing chambers 4. The arc extinguishing system further improves the breaking capacity of the switching unit. Further, one group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the first secondary contacts 31a and one end of the main contact 21; and the other group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the second secondary contacts 31b and the other end of the main contact 21. In other words, one end of the main contact 21 and one group of secondary contacts 31 (the first secondary contacts 31a) are in relative fit with one group of arc extinguishing chambers 4; and an opening distance formed by disconnecting this end of the main contact 21 from this group of secondary contacts 31 is in relative fit with an electric arc inlet of this group of arc extinguishing chambers 4. The other end of the main contact 21 and the other group of secondary contacts 31 (the second secondary contacts 31b) are in relative fit with the other group of arc extinguishing chambers 4; and an opening distance formed by disconnecting this end of the main contact 21 from this group of secondary contacts 31 is in relative fit with the electric arc inlet of this group of arc extinguishing chambers 4.

[0066] Further, as shown in FIGS. 1.1-2, and 10.1-13.2, both ends of each arc extinguishing chamber 4 extend to a switch-off position and a switch-on position of the corresponding secondary contact structure 3. In other words, the arc extinguishing chamber 4 covers the entire switch-on and switch-off path of the corresponding secondary contact structures 3, and an inlet of each arc extinguishing chamber 4 is opposite to the opening distance formed by disconnecting the corresponding secondary contact structure 3 from the main contact structure 2. The above arrangement of the arc extinguishing chambers 4 is conducive to further improving the breaking capacity of the contact system.

[0067] Further, the two groups of arc extinguishing chambers 4 are located on both sides of a first plane (a plane where the rotation axis of the main contact structure 2 and the rotation axes of the secondary contact structures 3 are located).

[0068] Further, the housing 1 includes a main cavity 1-0, and the contact system and the arc extinguishing system are arranged in the main cavity 1-0. Further, the housing 1 is further provided with two groups of separating ribs 1-3, wherein the two groups of separating ribs 1-3 are located on both radial sides of the main contact structure 2, and the two groups of separating ribs 1-3 divide the main cavity 1-0 into two contact cavities in cooperation with the contact system; and both ends of the main contact 21, two groups of secondary contacts 31, and two groups of arc extinguishing chambers 4 are arranged in the two contact cavities. In other words, one end of the main contact 21, one group of secondary contacts 31 and one group of arc extinguishing chambers 4 are arranged in one contact cavity, and the other end of the main contact 21, the other group of secondary contacts 31 and the other group of arc extinguishing chambers 4 are arranged in the other contact cavity. The above structural design is conducive to isolating an electric arc generated at the two groups of secondary contacts 31 and both ends of the main contact 2, and improving the breaking capacity. Further, the two groups of separating ribs 1-3 are in clearance fit with the secondary supports 32 of the two groups of secondary contact structures 3, respectively. In other words, a necessary small gap is provided between the separating ribs 1-3 and the secondary supports 32 to ensure that the secondary supports 32 can rotate freely so as to be connected with and disconnected from the main contact 2.

[0069] As shown in FIGS. 1.1-2, and 13.1-13.2, a first arrangement mode of the first wiring terminal 5 and the second wiring terminal 6 is shown: the housing 1 further includes a first terminal cavity 1-1 and a second terminal cavity 1-2, and the first terminal cavity 1-1, the main cavity 1-0 and the second terminal cavity 1-2 are arranged in sequence and separated; and the first wiring terminal 5 is arranged in the first terminal cavity 1-1, and the second wiring terminal 6 is arranged in the second terminal cavity 1-2. The "first terminal cavity 1-1, the main cavity 1-0 and the second terminal cavity 1-2 are arranged in sequence and separated" refers that the first terminal cavity 1-1, the main cavity 1-0 and the second terminal cavity 1-2 are arranged sequentially side by side, and a separating wall is respectively arranged between the first terminal cavity 1-1 and the main cavity 1-0, and between the main cavity 1-0 and the second terminal cavity 1-2. Further, the first terminal cavity 1-1, the main cavity 1-0 and the second terminal cavity 1-2 are sequentially arranged along a first direction d1. Specifically, the first direction d1 is preferably an up-down direction as shown in FIGS. 1.1-2, and 13.1-13.2.

[0070] As shown in FIGS. 10.1-10.2, a second arrangement mode of the first wiring terminal 5 and the second wiring terminal 6 is shown: the first wiring terminal 5, one group of arc extinguishing chambers 4, the second wiring terminal 6 and the other group of arc extinguishing chambers 4 are arranged around the contact system along a rotation direction of the main contact structure 2; the first wiring terminal 5 and the second wiring terminal 6 are arranged on a pair of opposite side walls of the main cavity 1-0, respectively; and the first wiring terminal 5 and the second wiring terminal 6 are at least partially inserted into the main cavity 1-0, respectively, and are electrically connected to the two groups of secondary contact structures 3, respectively.

[0071] As shown in FIGS. 11.1-12, a third arrangement mode of the first wiring terminal 5 and the second wiring terminal 6 is shown: the first wiring terminal 5, one group of arc extinguishing chambers 4, the second wiring terminal 6 and the other group of arc extinguishing chambers 4 are arranged around the contact system along the rotation direction of the main contact structure 2; and the housing 1 further includes a first terminal cavity 1-1 and a second terminal cavity 1-2, wherein the first wiring terminal 5 and the second wiring terminal 6 are respectively arranged in the first terminal cavity 1-1 and the second terminal cavity 1-2, and the two terminal cavities are communicated with the main cavity 1-0.

[0072] When the first wiring terminal 5 and the second wiring terminal 6 of the switching unit are arranged in the second arrangement mode or the third arrangement mode, a plurality of switching units are arranged in linkage side by side along the axial direction of the joint of the main contact structure 2, and two first wiring terminals 5 and two second wiring terminals 6 of the two adjacent switching units are located at four edges of a quadrangular prism. That is, a first wiring terminal 5 and a second wiring terminal 6 of one switching unit are located at one pair of edges of this quadrangular prism, and a first wiring terminal 5 and a second wiring terminal 6 of the other switching unit are located at the other pair of edges of this quadrangular prism. Further, the quadrangular prism is a right quadrangular prism and has a rectangular cross section.

[0073] As shown in FIGS. 1.1-2, 10.1-11.2, and 13.1-13.2, an implementation mode of the arc extinguishing chambers 4 is shown: each arc extinguishing chamber 4 includes at least two arc extinguishing chamber modules, and the arc extinguishing chamber modules are arranged sequentially along the rotation direction of the main contact structure 2 to form the arc extinguishing chamber 4. Further, each arc extinguishing chamber module includes partitions and arc extinguishing grids arranged between the partitions. Each arc extinguishing chamber 4 is composed of a plurality of arc extinguishing chamber modules, which is conducive to reducing the production difficulty.

[0074] As shown in FIG. 12, another implementation mode of the arc extinguishing chambers 4 is shown: each arc extinguishing chamber 4 includes partitions and grids, wherein a plurality of grids are arranged side by side around the contact system along the rotation direction of the main contact structure 2, and are located between two partitions which are opposite each other, and both ends of each grid are fixedly connected to the two partitions. The grids are uniformly distributed in the arc extinguishing chamber 4, which is conducive to improving the arc extinguishing capacity. Moreover, such arc extinguishing chambers 4 reduce the number of parts of the switching unit. However, the difficulty of self-assembly of the arc extinguishing chambers 4 is increased to a certain extent.

[0075] As shown in FIGS. 13.1-13.2, the switching electrical appliance of the present invention is preferably a circuit breaker. The following is an embodiment of the circuit breaker.

[0076] The circuit breaker in the present embodiment further includes operating mechanisms respectively arranged in the housing 1. Each operating mechanism is used to drive the contact system to be connected and disconnected. The operating mechanism includes a lever mechanism 11. The lever mechanism 11 includes a locking fastener 11-2 and a tripping member 11-3 which are pivotally arranged respectively and are in snap fit with each other. The tripping member 11-3 is driven by an external force to rotate, so as to release the snap fit from the locking fastener 11-2, so that the switching electrical appliance is tripped and switched-off.

[0077] Further, the operating mechanism further includes a handle 7 and a front link 10 which are pivotally arranged on the housing 1, wherein the handle 7 is connected to the lever mechanism 11 through the front link 10, and the lever mechanism 11 is connected to the main contact structure 2 or any of the secondary contact structures 3 in a transmission manner. Further, the lever mechanism 11 further includes a rotating plate 11-1 pivotally arranged on the housing 1, the locking fastener 11-2 and the tripping member 11-3 are pivotally arranged on the rotating plate 11-1, respectively, and the rotating plate 11-1 is connected to the main contact structure 2 or any of the secondary contact structures 3 in a transmission manner. Further, the operating mechanism further includes a rear link 12, and the lever mechanism 11 is connected to the main contact mechanism 2 or any of the secondary contact structures 3 through the rear link 12 in a transmission manner. Specifically, in the circuit breaker in the present embodiment, the rotating plate 11-1 of the lever mechanism 11 is connected to the first secondary supports 32a of the first secondary contact structures 3 in a transmission manner through the rear link 12.

[0078] As another embodiment, the rotating plate 11-1 of the lever mechanism 11 is implemented by the main support 23 of the main contact structure 2 or the secondary supports 32 of the secondary contact structures 3. In other words, the locking fastener 11-2 and the tripping member 11-3 are pivotally arranged on the main support 23 or the secondary support 32, respectively. This operating mechanism does not need to be equipped with the rear link 12.

[0079] The operating mechanisms of the above two implementation modes are both typical four-link operating mechanisms, and their working principles and processes of the operating mechanisms are the prior art in the art, and are not described in detail herein.

[0080] The circuit breaker in the present embodiment further includes an arc extinguishing system. The arc extinguishing system includes two groups of arc extinguishing chambers 4 arranged on both radial sides of the main contact structure 2, wherein one group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the first secondary contact structures 3a and the main contact structure 2, and the other group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the second secondary contact structures 3b and the main contact structure 2. In other words, one group of secondary contact structures 3 (the first secondary contact structures 3a) and the main contact structure 2 are in relative fit with one group of arc extinguishing chambers 4; and the other group of secondary contact structures 3 (the second secondary contact structures 3b) and the main contact structure 2 are in relative fit with the other group of arc extinguishing chambers 4. The arc extinguishing system further improves the breaking capacity of the switching unit. Further, one group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the first secondary contacts 31a and one end of the main contact 21; and the other group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the second secondary contacts 31b and the other end of the main contact 21. In other words, one end of the main contact 21 and one group of secondary contacts 31 (the first secondary contacts 31a) are in relative fit with one group of arc extinguishing chambers 4; and an opening distance formed by disconnecting this end of the main contact 21 from this group of secondary contacts 31 is in relative fit with an electric arc inlet of this group of arc extinguishing chambers 4. The other end of the main contact 21 and the other group of secondary contacts 31 (the second secondary contacts 31b) are in relative fit with the other group of arc extinguishing chambers 4; and an opening distance formed by disconnecting this end of the main contact 21 from this group of secondary contacts 31 is in relative fit with an electric arc inlet of this group of arc extinguishing chambers 4.

[0081] As shown in FIGS. 13.1-13.2, both ends of each arc extinguishing chamber 4 extend to a switch-off position and a switch-on position of the corresponding secondary contact structure 3. In other words, the arc extinguishing chamber 4 covers the entire switch-on and switch-off path of the corresponding secondary contact structures 3, and an inlet of the arc extinguishing chamber 4 is opposite to an opening distance formed by disconnecting the corresponding secondary contact structure 3 from the main contact structure 2. The above arrangement mode of the arc extinguishing chambers 4 is conducive to further improving the breaking capacity of the contact system.

[0082] In the circuit breaker in the present embodiment, each arc extinguishing chamber 4 includes a plurality of arc extinguishing chamber modules, and the arc extinguishing chamber modules are arranged sequentially along the rotation direction of the main contact structure 2 to form the arc extinguishing chamber 4. Further, each arc extinguishing chamber module includes partitions and arc extinguishing grids arranged between the partitions. Each arc extinguishing chamber 4 is composed of a plurality of arc extinguishing chamber modules, which is conducive to reducing the production difficulty.

[0083] As another embodiment, each arc extinguishing chamber 4 includes partitions and grids, wherein a plurality of grids are arranged side by side around the contact system along the rotation direction of the main contact structure 2, and are located between two partitions which are opposite each other, and both ends of each grid are fixedly connected to the two partitions. The grids are uniformly distributed in the arc extinguishing chamber 4, which is conducive to improving the arc extinguishing capacity. Moreover, such arc extinguishing chambers 4 reduce the number of parts of the switching unit. However, the difficulty of self-assembly of the arc extinguishing chambers 4 is increased to a certain extent.

[0084] The circuit breaker in the present embodiment further includes an overcurrent protection mechanism 9, which is used to drive the tripping member 11-3 to rotate so as to release snap fit from the locking fastener 11-2 when a short-circuited and / or overloaded fault occurs in a circuit where the circuit breaker is located, so that the circuit breaker is tripped and switched-off.

[0085] The following is a layout mode of the circuit breaker in the present embodiment: the first wiring terminal 5, the contact system and the second wiring terminal 6 are arranged sequentially along the first direction d1, and the operating mechanism and the contact system are arranged sequentially along the second direction d2, wherein the first direction d1 and the second direction d2 are perpendicular to each other. Specifically, as shown in FIGS. 13.1-13.2, the first direction d1 is an up-down direction, and the second direction d2 is a left-right direction. The circuit breaker in the present embodiment is compact and reasonable in layout, which not only effectively controls the overall specification volume of the circuit breaker, but also ensures the internal insulation performance of the circuit breaker.

[0086] Further, the two groups of arc extinguishing chambers 4 are located on both sides of a first plane (a plane where the rotation axes of the main contact structure 2 and the secondary contact structures 3 are located).

[0087] Further, the overcurrent protection mechanism 9 and the lever mechanism 11 are arranged side by side along the first direction d1.

[0088] Further, the housing 1 includes a first terminal cavity 1-1, a main cavity 1-0 and a second terminal cavity 1-2 which are arranged in sequence and separated along the first direction d1, and an operating cavity 1-4 spaced from the main cavity 1-1 along the second direction; and the first wiring terminal 5 is arranged in the first terminal cavity 1-1, the second wiring terminal 6 is arranged in the second terminal cavity 1-2, the contact system and the arc extinguishing system are arranged in the main cavity 1-0, and the operating mechanism and the overcurrent protection mechanism 9 are arranged in the operating cavity 1-4. The "spaced" refers that a separating wall is arranged between adjacent cavities (that is, between the first terminal cavity 1-1 and the main cavity 1-0, between the main cavity 1-0 and the second terminal cavity 1-2, and between the operating cavity 1-4 and the main cavity 1-0).

[0089] Further, the housing 1 is further provided with two groups of separating ribs 1-3, wherein the two groups of separating ribs 1-3 are located on both radial sides of the main contact structure 2, and the two groups of separating ribs 1-3 divide the main cavity 1-0 into two contact cavities in cooperation with the contact system; and both ends of the main contact 21, two groups of secondary contacts 31, and two groups of arc extinguishing chambers 4 are arranged in the two contact cavities, respectively. In other words, one end of the main contact 21, one group of secondary contacts 31 and one group of arc extinguishing chambers 4 are arranged in one contact cavity, and the other end of the main contact 21, the other group of secondary contacts 31 and the other group of arc extinguishing chambers 4 are arranged in the other contact cavity. The above structural design is conducive to isolating an electric arc generated at the two groups of secondary contacts 31 and both ends of the main contact 2, and improving the breaking capacity. Further, the two groups of separating ribs 1-3 are in clearance fit with the secondary supports 32 of the two groups of secondary contact structures 3. In other words, a necessary small gap is provided between the separating ribs 1-3 and the secondary supports 32 to ensure that the secondary supports 32 can rotate freely so as to be connected with and disconnected from the main contact 2.

[0090] As shown in FIGS. 1.1-2, the switching electrical appliance of the present invention is preferably an isolation switch. The following is an embodiment of the isolation switch.

[0091] The isolation switch in the present embodiment further includes an operating mechanism, which is used to drive the contact system to be connected and disconnected. Further, the operating mechanism includes a handle 7 and a transmission link 8 which are pivotally arranged on the housing 1, and the handle 7 is connected to the main contact structure 2 or any of the secondary contact structures 3 in a transmission manner through the transmission link 8. In the isolation switch in the present embodiment, the handle 7 is connected to the secondary supports 32a of the first secondary contact structures 3a in a transmission mode through the transmission link 8.

[0092] The isolation switch in the present embodiment further includes an arc extinguishing system. The arc extinguishing system includes two groups of arc extinguishing chambers 4 arranged on both radial sides of the main contact structure 2, wherein one group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the first secondary contact structures 3a and the main contact structure 2, and the other group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the second secondary contact structures 3b and the main contact structure 2. In other words, one group of secondary contact structures 3 (the first secondary contact structures 3a) and the main contact structure 2 are in relative fit with one group of arc extinguishing chambers 4; and the other group of secondary contact structures 3 (the second secondary contact structures 3b) and the main contact structure 2 are in relative fit with the other group of arc extinguishing chambers 4. The arc extinguishing system further improves the breaking capacity of the switching unit. Further, one group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the first secondary contacts 31a and one end of the main contact 21; and the other group of arc extinguishing chambers 4 are arranged on a switch-on and switch-off path of the second secondary contacts 31b and the other end of the main contact 21. In other words, one end of the main contact 21 and one group of secondary contacts 31 (the first secondary contacts 31a) are in relative fit with one group of arc extinguishing chambers 4; and an opening distance formed by disconnecting this end of the main contact 21 from this group of secondary contacts 31 is in relative fit with an electric arc inlet of this group of arc extinguishing chambers 4. The other end of the main contact 21 and the other group of secondary contacts 31 (the second secondary contacts 31b) are in relative fit with the other group of arc extinguishing chambers 4; and an opening distance formed by disconnecting this end of the main contact 21 from this group of secondary contacts 31 is in relative fit with an electric arc inlet of this group of arc extinguishing chambers 4.

[0093] As shown in FIGS. and 1.1-2, both ends of each arc extinguishing chamber 4 extend to a switch-off position and a switch-on position of the corresponding secondary contact structure 3. In other words, the arc extinguishing chamber 4 covers the entire switch-on and switch-off path of the corresponding secondary contact structures 3, and an inlet of the arc extinguishing chamber 4 is opposite to an opening distance formed by disconnecting the corresponding secondary contact structure 3 from the main contact structure 2. The above arrangement mode of the arc extinguishing chambers 4 is conducive to further improving the breaking capacity of the contact system.

[0094] In the isolation switch in the present embodiment, each arc extinguishing chamber 4 includes a plurality of arc extinguishing chamber modules, and the arc extinguishing chamber modules are arranged sequentially along the rotation direction of the main contact structure 2 to form the arc extinguishing chamber 4. Further, each arc extinguishing chamber module includes partitions and arc extinguishing grids arranged between the partitions. Each arc extinguishing chamber 4 is composed of a plurality of arc extinguishing chamber modules, which is conducive to reducing the production difficulty.

[0095] As another embodiment, each arc extinguishing chamber 4 includes partitions and grids, wherein a plurality of grids are arranged side by side around the contact system along the rotation direction of the main contact structure 2, and are located between two partitions which are opposite each other, and both ends of each grid are fixedly connected to the two partitions. The grids are uniformly distributed in the arc extinguishing chamber 4, which is conducive to improving the arc extinguishing capacity. Moreover, such arc extinguishing chambers 4 reduce the number of parts of the switching unit. However, the difficulty of self-assembly of the arc extinguishing chambers 4 is increased to a certain extent.

[0096] The following is a layout mode of the isolation switch in the present embodiment: the first wiring terminal 5, the contact system and the second wiring terminal 6 are arranged sequentially along the first direction d1, and the operating mechanism and the contact system are arranged sequentially along the second direction d2, wherein the first direction d1 and the second direction d2 are perpendicular to each other. Specifically, as shown in FIGS. 1.1-2, the first direction d1 is an up-down direction, and the second direction d2 is a left-right direction. The isolation switch in the present embodiment is compact and reasonable in layout, which not only effectively controls the overall specification volume of the isolation switch, but also ensures the internal insulation performance of the isolation switch.

[0097] Further, two groups of arc extinguishing chambers 4 are located on both sides of a first plane (a plane where the rotation axes of the main contact structure 2 and the secondary contact structures 3 are located).

[0098] Further, the housing 1 includes a first terminal cavity 1-1, a main cavity 1-0 and a second terminal cavity 1-2 which are arranged in sequence and separated along the first direction d1, and an operating cavity 1-4 spaced from the main cavity 1-1 along the second direction; and the first wiring terminal 5 is arranged in the first terminal cavity 1-1, the second wiring terminal 6 is arranged in the second terminal cavity 1-2, the contact system and the arc extinguishing system are arranged in the main cavity 1-0, and the operating mechanism and the overcurrent protection mechanism 9 are arranged in the operating cavity 1-4. The "spaced" refers that a separating wall is arranged between adjacent cavities (that is, between the first terminal cavity 1-1 and the main cavity 1-0, between the main cavity 1-0 and the second terminal cavity 1-2, and between the operating cavity 1-4 and the main cavity 1-0).

[0099] Further, the housing 1 is further provided with two groups of separating ribs 1-3, wherein the two groups of separating ribs 1-3 are located on both radial sides of the main contact structure 2, and the two groups of separating ribs 1-3 divide the main cavity 1-0 into two contact cavities in cooperation with the contact system; and both ends of the main contact 21, two groups of secondary contacts 31, and two groups of arc extinguishing chambers 4 are arranged in the two contact cavities, respectively. In other words, one end of the main contact 21, one group of secondary contacts 31 and one group of arc extinguishing chambers 4 are arranged in one contact cavity, and the other end of the main contact 21, the other group of secondary contacts 31 and the other group of arc extinguishing chambers 4 are arranged in the other contact cavity. The above structural design is conducive to isolating an electric arc generated at the two groups of secondary contacts 31 and both ends of the main contact 2, and improving the breaking capacity. Further, the two groups of separating ribs 1-3 are in clearance fit with the secondary supports 32 of the two groups of secondary contact structures 3, respectively. In other words, a necessary small gap is provided between the separating ribs 1-3 and the secondary supports 32 to ensure that the secondary supports 32 can rotate freely so as to be connected with and disconnected from the main contact 2.

[0100] It should be explained that, in the description of the present invention, the terms such as "up", "down", "left", "right", "inner" and "outer" indicating the directional or positional relations on the basis of the directional or positional relations shown in the drawings are only used for conveniently describing the present invention and simplifying the description, not indicate or imply that the referred devices or elements must have a specific orientation and be configured and operated in a specific direction; therefore, they cannot be construed as a limitation on the present invention.

[0101] We have made further detailed description of the present invention mentioned above in combination with specific preferred embodiments, but it is not deemed that the specific embodiments of the present invention is only limited to these descriptions. A person skilled in the art can also, without departing from the concept of the present invention, make several simple deductions or substitutions, which all be deemed to fall within the protection scope of the present invention.

Claims

1. A contact system, comprising a main contact structure (2) and secondary contact structures (3), which are pivotally arranged respectively and rotate synchronously, wherein two groups of secondary contact structures (3) are arranged on both radial sides of the main contact structure (2) and synchronously connected with or disconnected from the main contact structure (2).

2. The contact system according to claim 1, wherein the main contact structure (2) is connected to the two groups of secondary contact structures (3) in a transmission manner, respectively; the two groups of secondary contact structures (3) rotate synchronously in the same direction; and the secondary contact structures (3) rotate in synchronization with the main contact structure (2) in opposite directions.

3. The contact system according to claim 2, wherein the main contact structure (2) comprises a main gear, and each secondary contact structure (3) comprises a secondary gear (322) engaged with the main gear.

4. The contact system according to claim 1, wherein the rotation axes of the main contact structure (2) and the two groups of secondary contact structures (3) are arranged in parallel and are all located on a first plane.

5. The contact system according to claim 4, wherein the two groups of secondary contact structures (3) are of mutually centrosymmetric structures with a rotation center of the main contact structure (2) as a symmetry center.

6. A switching unit, comprising the contact system according to any one of claims 1 to 5, a housing (1), an arc extinguishing system, a first wiring terminal (5) and a second wiring terminal (6), wherein the contact system and the arc extinguishing system are arranged in the housing (1); the two groups of secondary contact structures (3) of the contact system are first secondary contact structures (3a) and second secondary contact structures (3b), respectively, wherein the first secondary contact structures (3a) and the second secondary contact structures (3b) are electrically connected to the first wiring terminal (5) and the second wiring terminal (6), respectively; the arc extinguishing system comprises two groups of arc extinguishing chambers (4) which are arranged on both radial sides of the main contact structure (2); one group of arc extinguishing chambers (4) are arranged on a switch-on and switch-off path of the first secondary contact structures (3a) and the main contact structure (2); and the other group of the arc extinguishing chambers (4) are arranged on a switch-on and switch-off path of the second secondary contact structures (3b) and the main contact structure (2).

7. The switching unit according to claim 6, wherein the rotation axes of the main contact structure (2) and the two groups of secondary contact structures (3) are arranged in parallel and are all located on a first plane; and the two groups of arc extinguishing chambers (4) are arranged on both sides of the first plane.

8. The switching unit according to claim 6, wherein the housing (1) comprises a main cavity (1-0), and the contact system and the arc extinguishing system are arranged in the main cavity (1-0).

9. The switching unit according to claim 8, wherein the housing (1) further comprises a first terminal cavity (1-1) and a second terminal cavity (1-2), and the first terminal cavity (1-1), the main cavity (1-0) and the second terminal cavity (1-2) are arranged in sequence and separated; the first wiring terminal (5) is arranged in the first terminal cavity (1-1), and the second wiring terminal (6) is arranged in the second terminal cavity (1-2); or the first wiring terminal (5), one group of arc extinguishing chambers (4), the second wiring terminal (6) and the other group of arc extinguishing chambers (4) are arranged around the contact system along a rotation direction of the main contact structure (2); the first wiring terminal (5) and the second wiring terminal (6) are arranged on a pair of opposite side walls of the main cavity (1-0) of the housing (1), respectively; and the first wiring terminal (5) and the second wiring terminal (6) are at least partially inserted into the main cavity (1-0), respectively, and are electrically connected to the two groups of secondary contact structures (3), respectively.

10. The switching unit according to claim 6, wherein both ends of each group of arc extinguishing chambers (4) extend to an switch-off position and a switch-on position of the corresponding secondary contact structure (3); each arc extinguishing chamber (4) comprises at least two arc extinguishing chamber modules, all of which are arranged sequentially along the rotation direction of the main contact structure (2) to form the arc extinguishing chamber (4); or each arc extinguishing chamber (4) comprises partitions and grids, wherein a plurality of grids are arranged side by side along the rotation direction of the main contact structure (2), and are located between two partitions which are opposite each other, and both ends of each grid are fixedly connected to the two partitions.

11. A switching electrical appliance, comprising the contact system according to any one of claims 1 to 5, a housing (1), an operating mechanism, a first wiring terminal (5) and a second wiring terminal (6), wherein the contact system, the operating mechanism, the first wiring terminal (5) and the second wiring terminal (6) are arranged in the housing (1), and the operating mechanism is used to drive the contact system to be switched on or off; the first wiring terminal (5), the contact system and the second wiring terminal (6) are arranged sequentially along a first direction d1; the operating mechanism and the contact system are arranged sequentially along a second direction d2, and the first direction d1 and the second direction d2 are perpendicular to each other; the main contact structure (2) and the secondary contact structures (3) are pivotally arranged on the housing (1), respectively; and the two groups of secondary contact structures (3) are electrically connected to the first wiring terminal (5) and the second wiring terminal (6), respectively.

12. The switching electrical appliance according to claim 11, wherein the operating mechanism comprises a handle (7) and a transmission link (8) which are pivotally arranged on the housing (1), and the handle (7) is connected to the main contact structure (2) or any of the secondary contact structures (3) in a transmission manner through the transmission link (8); and the housing (1) comprises a first terminal cavity (1-1), a main cavity (1-0) and a second terminal cavity (1-2) which are arranged in sequence and separated along the first direction d1, and an operating cavity (1-4) spaced from the main cavity (1-1) along the second direction d2; and the first wiring terminal (5) is arranged in the first terminal cavity (1-1), the second wiring terminal (6) is arranged in the second terminal cavity (1-2), the contact system and the arc extinguishing system are arranged in the main cavity (1-0), and the operating mechanism is arranged in the operating cavity (1-4).

13. The switching electrical appliance according to claim 11, wherein the operating mechanism comprises a lever mechanism (11); the lever mechanism (11) comprises a locking fastener (11-2) and a tripping member (11-3) which are pivotally arranged respectively and are in snap fit with each other; and the tripping member (11-3) is driven by an external force to rotate, so as to release the snap fit from the locking fastener (11-2), so that the switching electrical appliance is tripped and switched-off.

14. The switching electrical appliance according to claim 13, further comprising an overcurrent protection mechanism (9), wherein the overcurrent protection mechanism (9) is used to drive the tripping member (11-3) to rotate so as to release the snap fit from the locking fastener (11-2) when a short-circuited and / or overloaded fault occurs in a circuit where the switching electrical appliance is located; the lever mechanism (11) and the overcurrent protection mechanism (9) are arranged side by side along the first direction d1; and the overcurrent protection mechanism (9) and the contact system are arranged side by side along the second direction d2.

15. The switching electrical appliance according to claim 13, further comprising a handle (7) pivotally arranged on the housing (1), a front link (10), a rear link (12), and a rotating plate (11-1) pivotally arranged on the housing (1), wherein the handle (7) is connected to the lever mechanism (11) in a transmission manner through the front link (10); the locking fastener (11-2) and the tripping member (11-3) are pivotally arranged on the rotating plate (11-1), respectively; the rotating plate (11-1) is connected to the main contact structure (2) or any of the secondary contact structures (3) in a transmission manner; and the housing (1) comprises a first terminal cavity (1-1), a main cavity (1-0) and a second terminal cavity (1-2) which are arranged in sequence and separated along the first direction d1, and an operating cavity (1-4) spaced from the main cavity (1-1) along the second direction d2; and the first wiring terminal (5) is arranged in the first terminal cavity (1-1), the second wiring terminal (6) is arranged in the second terminal cavity (1-2), the contact system and the arc extinguishing system are arranged in the main cavity (1-0), and the operating mechanism and the overcurrent protection mechanism (9) are arranged in the operating cavity (1-4).

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