Moving contact assembly, switch unit and switching electric appliance

Abstract

The invention provides a moving contact assembly, a switch unit and a switching device, the moving contact assembly comprises a moving contact used for forming on / off cooperation with a static contact, the moving contact assembly further comprises an abdicating structure, and the abdicating structure is arranged on one side, used for facing an arc-isolating structure, of the moving contact assembly and is used for being located on a motion trail of the arc-isolating structure. Therefore, the arc-isolating structure can be prepared to give way to the arc-isolating structure. The switch unit comprises the moving contact assembly, and the switch unit is used for switching the electric appliance. When the moving contact and the static contact are closed, the abdicating structure is located on the motion trail of the arc-isolating structure, and the tail end of the arc-isolating structure located at the abdicating position can be inserted into the abdicating structure, that is, preparation abdicating is formed for the arc-isolating structure, so that the tail end of the arc-isolating structure is closer to the contact point of the moving contact and the static contact; the time point when the arc isolation structure starts to play an arc isolation role is advanced, the time from breaking to arc extinguishing of the switch unit is shortened, and the arc extinguishing performance of the switching device is improved.

Description

Technical Field

[0001] This invention relates to the field of switching device technology, specifically to a moving contact component, a switching unit, and a switching device. Background Technology

[0002] A switching device is a mechanical switching device that can conduct, carry, and break normal current, including circuit breakers, contactors, and disconnectors. A switching device has a switching unit including moving and stationary contacts, and achieves the conduction, carrying, and breaking of normal current through the opening and closing of the moving and stationary contacts. During the switching process from conducting to breaking, an electric arc exists. The presence of the arc makes it difficult for the moving and stationary contacts to promptly disconnect the electrical connection, resulting in incomplete breaking of normal current or an excessively long response time. Existing technology includes a switching unit with an arc-blocking structure. The arc-blocking structure is indirectly linked to the moving contact. As the moving contact moves away from the stationary contact, the arc-blocking structure moves synchronously from a clearance position to an arc-blocking position. That is, the arc-blocking structure gradually enters the space between the separating moving and stationary contacts, forming a solid isolation barrier between them, thereby isolating the arc and achieving the effect of arc extinguishing. However, the arc-blocking structure must have a gap between the moving and stationary contacts in order to enter the space between the moving and stationary contacts and begin to perform the functions of arc cutting and arc blocking. For products with high requirements for arc extinguishing performance, the existing arc-blocking structure is difficult to meet the requirements. Summary of the Invention

[0003] The purpose of this invention is to provide a moving contact component, a switching unit, and a switching device, which shortens the arc extinguishing time of the switching unit and improves the arc extinguishing performance of the switching device by changing the structure of the moving contact component.

[0004] To achieve the above objectives, the technical solution of the present invention includes:

[0005] A moving contact assembly includes a moving contact for forming an on / off engagement with a stationary contact, and further includes a clearance structure disposed on a side of the moving contact assembly facing an arc-blocking structure and positioned on the movement trajectory of the arc-blocking structure to provide pre-clearance to the arc-blocking structure.

[0006] In one embodiment, the prepared yielding is configured to: allow the arc-blocking structure to shorten the time required to switch from the yielding position to the arc-blocking position.

[0007] In one embodiment, the clearance structure is formed by a notch disposed at the edge of the moving contact component.

[0008] In one embodiment, the device further includes an arc-initiating element having an arc-initiating plate portion disposed on one side of the moving contact. The notch includes a first notch disposed on the moving contact and a second notch disposed on the arc-initiating plate portion. The first notch and the second notch coincide in the direction of the relative positions of the moving contact and the arc-initiating plate portion.

[0009] In one embodiment, one side of the moving contact is a contact surface for the stationary contact to conduct electricity. The moving contact is provided with at least one guide surface on the plane where the contact surface is located. The at least one guide surface is used to form a motion guide for the moving contact and the stationary contact to move closer to each other. The notch includes a first notch provided on the moving contact. The first notch is provided at the guide surface used for motion guidance.

[0010] In one embodiment, the notch is a rectangular, triangular, or semi-circular structure located in the middle of the edge.

[0011] The technical solution of the present invention also includes:

[0012] A switching unit includes the aforementioned moving contact assembly, which is disposed on a contact support. It also includes a stationary contact and an arc-blocking structure linked to the contact support. The moving contact of the moving contact assembly, driven by the contact support, forms an on / off connection with the stationary contact. The arc-blocking structure, driven by the contact support, switches between a clearance position and an arc-blocking position. When the arc-blocking structure is in the clearance position, the clearance structure of the moving contact assembly is located on the trajectory of the arc-blocking structure moving from the clearance position towards the arc-blocking position, and the end of the arc-blocking structure is located at the clearance structure, thereby forming the pre-clearance.

[0013] In one embodiment, the stationary contact is fixedly mounted on the fixed base, the contact support is a turntable component rotatably connected to the fixed base, the arc-blocking structure is formed on an arc-blocking component movably connected to the fixed base, the arc-blocking component switches between the clearance position and the arc-blocking position under the rotation of the turntable component, and the clearance structure is disposed on one side of the moving contact assembly in the rotation direction.

[0014] In one embodiment, the turntable includes a rotating shaft portion, which is a cylindrical shape with a recessed structure on its outer surface. The recessed structure rotates to a position opposite to the stationary contact as the arc-blocking structure moves from the clearance position to the arc-blocking position, thereby creating a movement clearance for the arc-blocking structure.

[0015] The technical solution of the present invention also includes:

[0016] A switching device includes the aforementioned switching unit.

[0017] In one embodiment, the switching device is a disconnecting switch or a circuit breaker.

[0018] The beneficial effects of this invention are:

[0019] 1. The present invention provides a clearance structure in the moving contact assembly, and the clearance structure is located on the side of the moving contact assembly facing the arc-blocking structure. When the moving contact and the stationary contact are closed, the clearance structure is located on the movement trajectory of the arc-blocking structure. The end of the arc-blocking structure in the clearance position can be inserted into the clearance structure, so that the end of the arc-blocking structure is closer to the contact point of the moving and stationary contacts, that is, it forms a preparatory clearance for the arc-blocking structure, advances the time when the arc-blocking structure begins to perform its arc-blocking function, shortens the time from disconnection to arc extinguishing of the switching unit, and improves the arc-extinguishing performance of the switching device.

[0020] 2. The first notch is set on the guide surface of the moving contact. The guide surface plays a guiding role, which helps the stationary contact to smoothly connect and conduct with the moving contact. The notch is set on the guide surface, which does not affect the contact area between the moving contact and the stationary contact. That is, it has no negative impact on the conductivity of the switchgear. It can also make way for the arc-blocking structure, which helps to improve the arc-extinguishing performance of the switchgear.

[0021] 3. The recessed structure on the rotating shaft increases the distance between the rotating shaft and the stationary contact, allowing the arc-blocking structure to move and preventing interference between the arc-blocking structure and the stationary contact during movement. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the moving contact component and contact head support connection according to an embodiment of the present invention.

[0023] Figure 2 This is a structural diagram of a moving touch component according to an embodiment of the present invention.

[0024] Figure 3 This is a perspective view of the moving contact structure according to an embodiment of the present invention.

[0025] Figure 4 This is a front view of the moving contact structure according to an embodiment of the present invention.

[0026] Figure 5 This is a top view of the arc-blocking structure of the switching unit in an embodiment of the present invention in an avoidance position.

[0027] Figure 6 This is a top view of the arc-blocking structure of the switching unit in an embodiment of the present invention, between the avoidance position and the arc-blocking position.

[0028] Figure 7 This is a top view of the arc-blocking structure of the switching unit in the arc-blocking position according to an embodiment of the present invention.

[0029] Figure 8This is a structural diagram of a moving contact component according to another embodiment of the present invention.

[0030] The components include: 1. Moving contact assembly, 10. Moving contact part, 11. Moving contact head, 111. Abutting protrusion, 112. First notch, 113. Guide surface, 12. Arc-initiating component, 121. Arc-initiating plate part, 1211. Second notch, 122. Arc-initiating connection part, 123. Limiting protrusion, 13. Relief structure, 14. Spring, 141. Limiting groove, 15. U-shaped connector, 2. Stationary contact assembly, 20. Stationary contact part, 21. Stationary contact head, 3. Contact support, 31. Rotating shaft part, 311. Mounting hole, 312. Recessed structure, 32. Second transmission gear structure, 4. Arc-isolating component, 40. Arc-isolating structure, 5. Fixing seat. Detailed Implementation

[0031] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0032] See Figures 1 to 7 As shown, this invention discloses a switching unit for a switching device, including a moving contact assembly 1, a stationary contact assembly 2, and a contact support 3. The moving contact assembly 1 is disposed on the contact support 3, and the moving contact assembly 1 is driven by the contact support 3 to switch on / off with the stationary contact assembly 2. The moving contact assembly 1 includes a moving contact 11 for forming a switching engagement with the stationary contact 21 of the stationary contact assembly 2. The contact support 3 is a turntable component rotatably connected to a fixed base 5, including a rotating shaft portion 31. The moving contact assembly 1 passes through a mounting hole 311 fixed in the rotating shaft portion 31, and both ends of the moving contact 11 extend outside the rotating shaft portion 31, forming two moving contact portions 10 on both sides of the rotating shaft portion 31 in the radial direction. The stationary contact assembly 2 has two sets, and the two stationary contacts 21 of the two sets of stationary contact assemblies 2 correspond to the two moving contacts 10 respectively. The moving contact assembly 1 rotates under the drive of the rotating shaft 31 to make the moving contact 11 and the stationary contact 21 connected / disconnected. More specifically, the two moving contacts 10 correspond to the two stationary contacts 21 respectively to form a connection / disconnection.

[0033] There are two moving contacts 11, which are arranged opposite to each other. The direction of any moving contact 11 toward the other moving contact 11 is defined as inward, and the direction away from it is defined as outward. The space between the inner sides of the two moving contacts 11 is used for the stationary contact portion 20 of the stationary contact 21 to pass through, thereby forming an electrical connection between the moving contact portion 10 and the stationary contact portion 20, that is, the moving contact 11 and the stationary contact 21 are conductive. The inner side of the moving contact 11 is provided with an abutting protrusion 111. The abutting protrusions 111 of the two moving contacts 11 abut against each other to limit the minimum distance between the inner sides of the two moving contacts 11. The arc-starting member 12 includes two arc-starting plate portions 121 respectively arranged on the outer sides of the two moving contacts 11 and an arc-starting connecting portion 122 connecting the two arc-starting plate portions 121. The arc-starting member 12 can guide the arc generated when the moving contact 11 and the stationary contact 21 are separated to the side away from the stationary contact 21, thereby reducing the arc and helping the arc to be extinguished as soon as possible. The arc-starting element 12 is made of conductive material and therefore has a certain rigidity. The two arc-starting plates 121 are respectively disposed on the outside of the moving contact 11, which can form a rigid support for the moving contact 11, thus giving the arc-starting element 12 a supporting function. The arc-starting connecting part 122 connects the two arc-starting plates 121, thereby forming an outer limit on the two moving contacts 11, causing the abutting protrusions 111 of the two moving contacts 11 to abut against each other, which is conducive to reliable conduction between the moving contact 11 and the stationary contact 21.

[0034] The moving contact assembly 1 also includes a spring 14, which is disposed on the outer side of the arc-inducing plate portion 121. The moving contact assembly 1 passes through the mounting hole 311 of the rotating shaft portion 31. The spring 14 abuts against the mounting hole 311, thereby limiting the two moving contacts 11 in the inward and outward directions. The two ends of the spring 14 correspond to the two ends of the moving contacts 11, that is, to the moving contact portion 10 of the moving contact assembly 1. Thus, under the action of the hole wall of the mounting hole 311, the spring 14 applies elastic pressure to the inward direction of the moving contacts 11, causing the abutting protrusions 111 of the two moving contacts 11 to abut against each other, further ensuring reliable conduction between the moving contacts 11 and the stationary contact 21. Both ends of the reed 14 are provided with limiting grooves 141, with the ends of the limiting grooves 141 located at the ends of the reed 14. The ends of the arc-initiating plate portion 121 of the arc-initiating member 12 are provided with limiting protrusions 123 corresponding to the limiting grooves 141. The two sides of the limiting grooves 141 cooperate with the limiting protrusions 123 to limit the reed 14. In order to further ensure the stable connection of the moving contact assembly 1 before it is inserted into the mounting hole 311, the moving contact assembly 1 also includes a U-shaped connector 15. The U-shaped connector 15 is a U-shaped rod structure, which is installed opposite to the arc-initiating connection portion 122 of the arc-initiating member 12. The U-shaped connector 15 is installed on the outside of the two reeds 14, thereby limiting and fixing the moving contact assembly 1 on the outside.

[0035] See Figure 1 , Figures 5 to 7As shown, the switching unit also includes an arc-blocking structure 40, which is formed on an arc-blocking member 4. The arc-blocking member 4 is rotatably mounted on a fixed base 5. The rotating shaft 31 is connected to the arc-blocking member 4 via a gear transmission mechanism. The gear transmission mechanism includes a first transmission gear structure (not shown in the figure) mounted on the arc-blocking member 4 and a second transmission gear structure 32 mounted on the outside of the rotating shaft 31. Thus, the arc-blocking member 4 rotates relative to the fixed base 5 under the drive of the rotating shaft 31, realizing the switching of the arc-blocking structure 40 from the avoidance position to the arc-blocking position. During the switching process, it enters between the gradually breaking moving contact 11 and the stationary contact 21, so that the arc-blocking structure 40 selectively acts as a solid isolation barrier, cutting off the arc generated during the breaking of the moving contact 11 and the stationary contact 21 and forming a solid isolation barrier between the moving contact 11 and the stationary contact 21, effectively cutting off the arc and preventing the arc from reigniting. The avoidance position refers to the position of the arc-blocking structure 40 when the moving contact 11 is in the conducting position. At this time, the arc-blocking structure 40 is located on one side of the moving contact 11 and the stationary contact 21, so that the moving contact 11 and the stationary contact 21 can reliably contact and form a conduction. The arc-blocking position refers to the position of the arc-blocking structure 40 when the moving contact 11 is in the disconnected position. At this time, the arc-blocking structure 40 is located between the disconnected moving contact 11 and the stationary contact 21, forming a solid isolation barrier and increasing the creepage distance between the moving contact 11 and the stationary contact 21. In this embodiment, the arc-blocking member 4 is a cover-shaped structure, and the arc-blocking structure 40 is an arc-shaped plate structure on the arc-blocking member 4. The arc-blocking member 4 rotates with the rotation of the contact support 3, thereby forming a semi-encirclement of the stationary contact 21 when the moving contact 11 and the stationary contact 21 are disconnected. The arc-blocking structure 40 moves to the space between the stationary contact 21 and the moving contact 11, separating the stationary contact 21 and the moving contact 11. In other embodiments, the arc-blocking member 4 can also be other structures, as long as the arc-blocking structure 40 can enter between the moving and stationary contacts to form a solid isolation barrier as the moving and stationary contacts break.

[0036] The arc-initiating element 12 moves synchronously with the moving contact 11. Therefore, as the moving contact 11 moves in the breaking direction, the arc-initiating element 12 also moves away from the stationary contact 21, thereby drawing the arc away from the stationary contact 21 and towards the arc-extinguishing chamber (not shown in the figure), where the arc-isolating structure 40 cuts off the arc. Thus, the arc-initiating element 12 guiding the arc towards the arc-extinguishing chamber reduces the difficulty for the arc-isolating structure 40 to cut off the arc, shortens the time it takes for the arc to be extinguished, and thus shortens the arc-extinguishing time of the switching unit, improving the arc-extinguishing performance of the switching device.

[0037] In the above embodiment, the contact support 3 and the arc-blocking member 4 are linked by a gear transmission mechanism. In other embodiments, the contact support 3 and the arc-blocking member 4 can also be linked by a pushing part and an elastic reset member. The pushing part on the contact support 3 is used to push the arc-blocking member to move unidirectionally between the avoidance position and the arc-blocking position. The elastic reset member—more specifically, a torsion spring set on the rotating shaft of the arc-blocking member 4—is used to push the arc-blocking member to reset. For example, the pushing part of the contact support pushes the arc-blocking member to switch from the avoidance position to the arc-blocking position, and the elastic reset member is used to drive the arc-blocking member to reset from the arc-blocking position to the avoidance position, and vice versa.

[0038] See Figures 5 to 7 As shown, the movable contact assembly 1 is provided with a clearance structure 13. The clearance structure 13 is disposed on the side of the movable contact assembly 1 facing the arc-blocking structure 40 and is positioned on the movement trajectory of the arc-blocking structure 40 to provide pre-clearance to the arc-blocking structure 40. More specifically, when the movable contact assembly 1 is installed on the contact support 3 and disposed on the fixed base 5, the clearance structure 13 is on the side of the movable contact assembly 1 facing the arc-blocking structure 40. When the arc-blocking structure 40 is in the clearance position and the movable contact assembly 1 is in the conduction position, the clearance structure 13 is positioned on the movement trajectory of the arc-blocking structure 40, so that the end of the arc-blocking structure 40 can be positioned at the clearance structure 13, and the clearance structure 13 provides pre-clearance to the arc-blocking structure 40. The preparatory clearance described in this invention refers to the fact that when the arc-blocking structure 40 is in the clearance position, its end is moved closer to the direction of the switching position by means of the clearance structure 13, that is, closer to the contact point between the moving contact 11 and the stationary contact 21. This allows the arc-blocking structure 40 to enter between the moving contact 11 and the stationary contact 21 earlier, thereby forming a solid isolation barrier between the moving contact 11 and the stationary contact 21 earlier and shortening the time to switch from the clearance position to the arc-blocking position. The contact point between the moving contact 11 and the stationary contact 21 refers to the position where the moving contact 11 and the stationary contact 21 form electrical contact when the moving and stationary contacts are conducting. This position is not limited to a point or a region. More specifically, see [link to relevant documentation]. Figures 2 to 4 As shown, the clearance structure 13 is formed by a notch provided at the edge of the moving contact assembly 1. In one embodiment, the notch forming the clearance structure 13 is a first notch 112 provided on the moving contact 11, the first notch 112 being located on the side of the moving contact 11 facing the arc-blocking structure 40. (See reference...) Figure 8As shown, in another embodiment, the notch forming the clearance structure 13 includes a first notch 112 on the moving contact 11 and a second notch 1211 on the arc-starting plate portion 121 of the arc-starting member 12. The first notch 112 and the second notch 1211 coincide in the direction of their relative positions—that is, in the inward and outward direction. The presence of the second notch 1211 allows for a larger width of the arc-starting plate portion 121. The second notch 1211 is only required at the position corresponding to the first notch 112, resulting in a larger area of ​​the arc-starting plate portion 121 and a better arc-starting effect.

[0039] Because the moving contact assembly 1 has a notch that forms the clearance structure 13, when the moving and stationary contacts are in contact, the end of the arc-blocking structure 40 can get closer to the contact point between the moving contact 11 and the stationary contact 21. The arc-blocking structure 40 is indirectly linked to the moving contact 11 through the contact support 3, meaning that the two move synchronously. When the moving contact 11 moves away from the stationary contact 21, the arc-blocking structure 40 can enter the moving contact 11 and the stationary contact 21 earlier with the help of the clearance structure 13 and begin to cut the arc. That is, it forms a solid isolation barrier between the moving contact 11 and the stationary contact 21 earlier, reduces the arc burning time, shortens the arc extinguishing time of the switching unit, and improves the arc extinguishing performance of the switching device.

[0040] See Figures 3 to 4 As shown, the inner surface of the moving contact 11 is the contact surface for the stationary contact 21 to conduct electricity. The moving contact 11 has two guide surfaces 113 on the plane of the contact surface, respectively located on both sides of the moving contact 11. The guide surfaces 113 are used to guide the relative approach movement of the moving contact 11 and the stationary contact 21, allowing the stationary contact 21 to smoothly enter between the two moving contacts 11. In this embodiment, the guide surface 113 is an inclined surface; in other embodiments, the guide surface can also be a curved surface. During operation, only the guide surface 113 near the stationary contact 21 serves as the motion guide; the other guide surface 113 enables the moving contact 11 to achieve motion balance. The first notch 112 is located at the guide surface 113 used for motion guidance. Since the guide surface 113 is used for motion guidance, the moving contact 11 does not rely on the guide surface 113 to form an electrical connection with the stationary contact 21. Therefore, the first notch 112 on the guide surface 113 does not reduce the conductive area of ​​the moving contact 11. The first notch 112 is only provided on the guide surface 113 on one side of the moving contact 11. The guide surface 113 is a symmetrical structure on the moving contact 11. Therefore, the first notch 112 plays a foolproof role in the installation of the moving contact assembly 1, preventing the moving contact assembly 1 from being installed backwards.

[0041] The notch is a rectangular, triangular, or semi-circular structure located in the middle of the edge. In the above embodiment, the first notch 112 and the second notch 1211 are rectangular structures, which are easy to form. They are formed on the edge in the rotation direction of the moving contact assembly 1 and located in the middle of the radial direction of the moving contact assembly 1. Therefore, the notch is a certain distance from the radial end of the moving contact assembly 1. In order to ensure that the moving contact 11 and the stationary contact 21 have a sufficiently large contact area, the moving and stationary contacts extend towards each other by a certain length. Therefore, when the arc-blocking structure 40 is in the avoidance position, the end of the arc-blocking structure 40 corresponds to the middle of the radial direction of the moving contact assembly 1. Setting the notch in the middle of the moving contact assembly 1 has less impact on the volume of the moving contact 11 than extending the notch to the end of the moving contact assembly 1, thus maintaining the good electrical performance of the moving contact 11 and facilitating the conduction of large currents.

[0042] In the above embodiment, there are two moving contacts 11, and the inner sides of the two moving contacts 11 form contact surfaces that are in communication with the stationary contact. In other embodiments, there may be only one moving contact 11, and correspondingly, one side of the moving contact 11 forms a contact surface, and the arc-initiating plate portion 121 of the arc-initiating member 12 is provided on the side of the moving contact 11 that is opposite to the contact surface.

[0043] See Figure 1 , Figures 5 to 7 As shown, the rotating shaft 31 is a cylinder with a recessed structure 312 on its outer surface. The recessed structure 312 rotates to a position opposite to the stationary contact 21 as the arc-blocking structure 40 moves from the avoidance position to the arc-blocking position, thereby increasing the distance between the rotating shaft 31 and the stationary contact 21, creating a movement clearance for the arc-blocking structure 40, and preventing movement interference between the arc-blocking structure 40 and the stationary contact 21. If the rotating shaft 31 does not have a recessed structure 312 and its outer surface is set as a complete annular surface structure, in order to prevent movement interference between the arc-blocking structure 40 and the stationary contact 21, the outer diameter of the rotating shaft 31 must be set smaller or the stationary contact 21 must be set further away from the moving contact 11. Setting the outer diameter of the rotating shaft 31 smaller is not conducive to the stable installation of the moving contact assembly 1 and is also not conducive to the strength of the rotating shaft 31. Setting the stationary contact 21 further away from the moving contact 11 will reduce the contact area between the moving and stationary contacts, that is, reduce the current carrying capacity of the switching device with this switching unit. Therefore, the presence of the recessed structure can also ensure the conductivity of the switching device, making it meet the requirements for high current switching.

[0044] In the above embodiments, the moving contact component 1 is disposed on the contact support 3 and is rotated by the contact support 3 to open and close the moving contact 11 and the stationary contact 21. The moving contact component 1 also forms an indirect linkage relationship with the arc-blocking structure 40 through the contact support 3. In other embodiments, the moving contact component 1 can also perform other movements to realize the opening and closing of the moving and stationary contacts, such as linear translation. Correspondingly, the moving contact component 1 can also form a linkage relationship with the arc-blocking structure 40 through other linear translation motion mechanisms. For example, the linear translation motion mechanism is provided with a rack and pinion structure, and the arc-blocking cover is provided with a gear structure. The two are linked together by the rack and pinion to form a linkage relationship between the moving contact component 1 and the arc-blocking structure 40.

[0045] See Figures 5 to 7 As shown, the contact support 3 is rotatably connected to the fixed base 5, so that the moving contact assembly 1 and the fixed base 5 form a relative motion connection. The arc-blocking member 4 is also rotatably connected to the fixed base 5, and the moving contact assembly 1 and the arc-blocking member 4 form an indirect linkage through the contact support 3. The stationary contact assembly 2 is fixedly installed on the fixed base 5, and each stationary contact assembly 2 includes a stationary contact 21. The end of the stationary contact 21 is a stationary contact portion 20 for forming an electrical connection with the moving contact portion 10 of the moving contact assembly 1. In other embodiments, the moving contact portion 10 and the stationary contact portion 20 are not limited to two sets. It is also feasible to provide one moving contact portion 10 and one stationary contact portion 20 to form a set of contacts; correspondingly, it is also feasible to provide two or more moving contact portions 10 and stationary contact portions 20 to form two or more sets of contacts.

[0046] In one embodiment, the switching device having the above-described contact system is a disconnecting switch; in other embodiments, the switching device may also be a circuit breaker.

[0047] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that the remaining undescribed parts are prior art, and that all changes in form and detail made to the invention without departing from the spirit and scope of the invention as defined in the appended claims fall within the protection scope of the invention.

Claims

1. A moving contact assembly, comprising a moving contact for forming an on / off engagement with a stationary contact, characterized in that: It also includes a clearance structure, which is disposed on the side of the moving contact assembly facing the arc-blocking structure and positioned on the movement trajectory of the arc-blocking structure to provide pre-clearance to the arc-blocking structure.

2. The moving contact component according to claim 1, characterized in that: The prepared yielding position is configured to allow the arc-blocking structure to shorten the time required to switch from the avoidance position to the arc-blocking position.

3. The moving contact component according to claim 1, characterized in that: The clearance structure is formed by a notch provided at the edge of the moving contact component.

4. A moving contact component according to claim 3, characterized in that: It also includes an arc-initiating element, which has an arc-initiating plate portion disposed on one side of the moving contact. The notch includes a first notch disposed on the moving contact and a second notch disposed on the arc-initiating plate portion. The first notch and the second notch coincide in the direction of the relative positions of the moving contact and the arc-initiating plate portion.

5. A moving contact component according to claim 3, characterized in that: One side of the moving contact is a contact surface for the stationary contact to conduct electricity. The moving contact is provided with at least one guide surface on the plane where the contact surface is located. The at least one guide surface is used to form a motion guide for the moving contact and the stationary contact to move closer to each other. The notch includes a first notch provided on the moving contact. The first notch is provided at the guide surface used for motion guidance.

6. A moving contact component according to claim 3, characterized in that: The notch is a rectangular, triangular, or semi-circular structure located in the middle of the edge.

7. A switching unit, characterized in that: The device includes the moving contact assembly as described in any one of claims 1-6, wherein the moving contact assembly is disposed on a contact support, and further includes a stationary contact and an arc-blocking structure linked to the contact support. The moving contact of the moving contact assembly forms an on / off engagement with the stationary contact under the drive of the contact support. The arc-blocking structure switches between a clearance position and an arc-blocking position under the drive of the contact support. When the arc-blocking structure is in the clearance position, the clearance structure of the moving contact assembly is located on the movement trajectory of the arc-blocking structure from the clearance position toward the arc-blocking position, and the end of the arc-blocking structure is located at the clearance structure, thereby forming the pre-clearance.

8. A switching unit according to claim 7, characterized in that: The stationary contact is fixedly mounted on the fixed base. The contact support is a turntable component rotatably connected to the fixed base. The arc-blocking structure is formed on an arc-blocking component movably connected to the fixed base. The arc-blocking component switches between the clearance position and the arc-blocking position under the rotation of the turntable component. The clearance structure is located on one side of the moving contact assembly in the rotation direction.

9. A switching unit according to claim 8, characterized in that: The turntable component includes a rotating shaft, which is a cylindrical shape with a recessed structure on its outer surface. The recessed structure rotates to a position opposite to the stationary contact as the arc-blocking structure moves from the avoidance position to the arc-blocking position, thereby creating a movement clearance for the arc-blocking structure.

10. A switching device, characterized in that: Includes the switching unit as described in any one of claims 7-9.

11. A switching device according to claim 10, characterized in that: The switchgear is either a disconnector or a circuit breaker.

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