Moving contact assembly, switch unit and switching electric appliance

Abstract

The utility model 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, and also comprises an abdicating structure, and the abdicating structure is arranged on one side of the moving contact assembly used for facing an arc-isolating structure 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] The utility model relates to the technical field of switch electrical appliances, and in particular to a movable contact component, a switch unit and a switch electrical appliance. Background Art

[0002] A switching device is a mechanical switching device that can conduct, carry and disconnect normal current, including circuit breakers, contactors, disconnectors, etc. The switching device has a switching unit including a moving contact and a static contact, and conducts, carries and disconnects normal current by switching the moving and static contacts on and off. There is an arc in the process of the moving and static contacts switching from conduction to disconnection. The presence of the arc makes it difficult for the moving and static contacts to cut off the electrical connection in time, resulting in the switching device not being able to completely disconnect the normal current or having a long response time. In the prior art, there is a switching unit with an arc-isolating structure. The arc-isolating structure forms an indirect linkage with the moving contact. As the moving contact moves in a direction away from the static contact, the arc-isolating structure synchronously moves from the avoidance position to the arc-isolating position, that is, the arc-isolating structure gradually enters between the moving contact and the static contact in separation, forming a physical isolation barrier between the moving and static contacts, thereby isolating the arc to achieve the effect of arc extinguishing. However, the arc-isolating structure must have a gap between the moving and static contacts in order to enter between the moving and static contacts and start to cut and isolate the arc. For products with high arc extinguishing performance requirements, the existing arc-isolating structure is difficult to meet the requirements. Summary of the Invention

[0003] The purpose of the utility model is to provide a moving contact assembly, a switch unit and a switch electrical appliance, which can shorten the arc extinguishing time of the switch unit and improve the arc extinguishing performance of the switch electrical appliance by changing the structure of the moving contact assembly.

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

[0005] A moving contact assembly includes a moving contact for forming an on / off cooperation with a static contact, and also includes a yielding structure. The yielding structure is arranged on a side of the moving contact assembly facing an arc isolation structure and is located on the movement trajectory of the arc isolation structure, so as to form a preparatory yielding position for the arc isolation structure.

[0006] In one embodiment, the preparatory yield is configured as a yield that enables the arc isolation structure to shorten the time it takes to switch from the avoidance position to the arc isolation position.

[0007] In one embodiment, the relief structure is formed by a notch provided on the edge of the dynamic contact component.

[0008] In one embodiment, an arc-striking piece is further included, wherein the arc-striking piece has an arc-striking plate portion arranged on one side of the moving contact, and the notch includes a first notch arranged on the moving contact and a second notch arranged on the arc-striking plate portion. In the direction of the relative position of the moving contact and the arc-striking plate portion, the first notch and the second notch overlap.

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

[0010] In one embodiment, the notch is a rectangular, triangular or semicircular structure arranged in the middle of the edge.

[0011] The technical solution of the utility model also includes:

[0012] A switch unit includes the above-mentioned moving contact assembly, which is arranged on a contact support and also includes a static contact and an arc-isolating structure linked to the contact support. The moving contact of the moving contact assembly forms an on / off cooperation with the static contact under the drive of the contact support, and the arc-isolating structure switches between an avoidance position and an arc-isolating position under the drive of the contact support. When the arc-isolating structure is in the avoidance position, the yielding structure of the moving contact assembly is located on the movement trajectory of the arc-isolating structure from the avoidance position toward the arc-isolating position, and the end of the arc-isolating structure is located at the yielding structure, thereby forming the preparatory yielding.

[0013] In one embodiment, the static contact is fixedly arranged on a fixed seat, the contact support is a turntable member rotatably connected to the fixed seat, the arc isolation structure is formed on an arc isolation member movably connected to the fixed seat, the arc isolation member switches between the avoidance position and the arc isolation position under the rotation action of the turntable member, and the yielding structure is arranged on one side of the rotation direction of the moving contact component.

[0014] In one embodiment, the turntable member includes a rotating shaft portion, which is a cylinder with a concave structure on the outer side. The concave structure rotates to a position opposite to the static contact as the arc isolation structure moves from the avoidance position to the arc isolation position, thereby forming a movement to give way for the arc isolation structure.

[0015] The technical solution of the utility model also includes:

[0016] A switching device comprises the above-mentioned switching unit.

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

[0018] The beneficial effects of the utility model are:

[0019] 1. The utility model provides a yield structure in the moving contact assembly, and the yield structure is provided on the side of the moving contact assembly facing the arc isolation structure. When the moving contact and the static contact are closed, the yield structure is located on the movement trajectory of the arc isolation structure, and the end of the arc isolation structure in the avoidance position can be inserted into the yield structure, so that the end of the arc isolation structure is closer to the contact point of the moving and static contacts, that is, a preparatory yield is formed for the arc isolation structure, and the time point when the arc isolation structure starts to play the arc isolation role is advanced, thereby shortening the time from disconnection to arc extinguishing of the switch unit, thereby improving the arc extinguishing performance of the switching electrical appliance.

[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 static contact to smoothly connect with the moving contact. The notch is set on the guide surface without affecting the contact area between the moving contact and the static contact, that is, it has no negative impact on the conductive performance of the switching electrical appliance, and can also make way for the arc isolation structure to help improve the arc extinguishing performance of the switching electrical appliance.

[0021] 3. The recessed structure provided on the rotating shaft increases the distance between the rotating shaft and the static contact, thereby making way for the arc-isolating structure to move and prevent the arc-isolating structure from interfering with the static contact during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of the movable contact assembly and contact support connection of an embodiment of the present utility model.

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

[0024] Figure 3 It is a three-dimensional diagram of the moving contact structure of an embodiment of the present utility model.

[0025] Figure 4 It is a front view of the moving contact structure of an embodiment of the utility model.

[0026] Figure 5 It is a top view of the arc isolation structure of the switch unit in the embodiment of the utility model in the avoidance position.

[0027] Figure 6 It is a top view of the arc isolation structure of the switch unit of the embodiment of the utility model in the state between the avoidance position and the arc isolation position.

[0028] Figure 7 It is a top view of the arc isolation structure of the switch unit according to the embodiment of the utility model in the arc isolation position.

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

[0030] Among them: 1 moving contact assembly, 10 moving contact part, 11 moving contact, 111 abutting convex bump, 112 first notch, 113 guide surface, 12 arc-striking part, 121 arc-striking plate part, 1211 second notch, 122 arc-striking connecting part, 123 limiting convex bump, 13 giving way structure, 14 spring, 141 limiting groove, 15 U-shaped connecting part, 2 static contact assembly, 20 static contact part, 21 static contact, 3 contact support, 31 rotating shaft part, 311 mounting hole, 312 recessed structure, 32 second transmission tooth structure, 4 arc isolation part, 40 arc isolation structure, 5 fixing seat. DETAILED DESCRIPTION

[0031] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0032] See Figures 1 to 7 As shown, the utility model discloses a switch unit for switching electrical appliances, comprising a moving contact assembly 1, a stationary contact assembly 2, and a contact support 3. The moving contact assembly 1 is mounted on the contact support 3. Driven by the contact support 3, the moving contact assembly 1 moves to switch on / off with the stationary contact assembly 2. The moving contact assembly 1 includes a moving contact 11 for forming an on / off cooperation with the stationary contact 21 of the stationary contact assembly 2. The contact support 3 is a turntable member rotatably connected to a fixed base 5 and includes a rotating shaft portion 31. The moving contact assembly 1 is provided with a mounting hole 311 fixed to the rotating shaft portion 31, and both ends of the moving contact 11 extend outside the rotating shaft portion 31 to form two moving contact portions 10 on both sides of the rotating shaft portion 31 in the radial direction. The static contact assembly 2 has two groups. The two static contacts 21 of the two groups of static contact assemblies 2 correspond to the two moving contact parts 10 respectively. The dynamic contact assembly 1 rotates under the drive of the rotating shaft part 31 to make the moving contacts 11 and the static contacts 21 connected / disconnected. More specifically, the two moving contact parts 10 correspond to the two static contacts 21 to form a connection / disconnection.

[0033] There are two moving contacts 11, which are arranged opposite each other. The direction of one 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 to accommodate the static contact portion 20 of the static contact 21, thereby establishing an electrical connection between the moving contact portion 10 and the static contact portion 20, i.e., the moving contact 11 and the static contact 21 are electrically conductive. Abutment bumps 111 are provided on the inner sides of the moving contacts 11. The abutment bumps 111 of the two moving contacts 11 abut against each other, limiting the minimum spacing between the inner sides of the two moving contacts 11. The arc-striking member 12 includes two arc-striking plates 121, respectively disposed on the outer sides of the two moving contacts 11, and an arc-striking connection portion 122 connecting the two arc-striking plates 121. The arc-striking member 12 can direct the arc generated when the moving contact 11 and the static contact 21 are disconnected, away from the static contact 21, thereby reducing the arc and helping to extinguish the arc as quickly as possible. The arc-striking member 12 is made of a conductive material and therefore has a certain degree of rigidity. The two arc-striking plates 121, respectively disposed on the outer sides of the movable contact 11, can provide rigid support for the movable contact 11, thereby providing a support function for the arc-striking member 12. The arc-striking connecting portion 122 connects the two arc-striking plates 121, thereby forming an outer limit for the two movable contacts 11, forcing the abutting bumps 111 of the two movable contacts 11 to abut, thereby facilitating reliable conduction between the movable contact 11 and the stationary contact 21.

[0034] The movable contact assembly 1 also includes a spring 14, which is positioned outside the arc-starting plate portion 121. The movable contact assembly 1 is inserted into the mounting hole 311 of the rotating shaft portion 31. The spring 14 engages with the mounting hole 311 to limit the two movable contacts 11 inward and outward directions. The two ends of the spring 14 correspond to the two ends of the movable contact 11, that is, to the movable contact portion 10 of the movable contact assembly 1. As a result, the spring 14, under the action of the wall of the mounting hole 311, applies elastic pressure inwardly toward the movable contact 11, causing the abutting bumps 111 of the two movable contacts 11 to abut, further ensuring reliable conduction between the movable contact 11 and the stationary contact 21. Retaining grooves 141 are provided at both ends of the spring 14, with the ends of the retaining grooves 141 located at the distal ends of the spring 14. Retaining bumps 123 corresponding to the retaining grooves 141 are provided at both ends of the arc-striking plate portion 121 of the arc-striking member 12. The sides of the retaining grooves 141 cooperate with the retaining bumps 123 to limit the position of the spring 14. To further ensure a stable connection before the movable contact assembly 1 is inserted into the mounting hole 311, the movable contact assembly 1 further includes a U-shaped connector 15. The U-shaped connector 15 is a U-shaped rod structure that is mounted opposite the arc-striking connection portion 122 of the arc-striking member 12. The U-shaped connector 15 is mounted on the outside of the two springs 14, thereby limiting and fixing the movable contact assembly 1 from the outside.

[0035] See Figure 1 、 Figures 5 to 7As shown, the switch unit also includes an arc isolation structure 40, which is formed on an arc isolation member 4, which is rotatably arranged on a fixed seat 5, and the rotating shaft portion 31 is connected to the arc isolation member 4 through a gear transmission mechanism, which includes a first transmission tooth structure (the first transmission tooth structure is not shown in the figure) arranged on the arc isolation member 4 and a second transmission tooth structure 32 arranged on the outside of the rotating shaft portion 31, so that the arc isolation member 4 rotates relative to the fixed seat 5 under the drive of the rotating shaft portion 31, so that the arc isolation structure 40 is switched from the avoidance position to the arc isolation position, and enters between the gradually disconnected moving contact 11 and the static contact 21 during the switching process, so that the arc isolation structure 40 selectively acts as a physical isolation barrier, cuts off the arc generated during the disconnection of the moving contact 11 and the static contact 21, and forms a physical isolation barrier between the moving contact 11 and the static contact 21, effectively cutting off the arc and preventing the arc from reigniting. The avoidance position refers to the position of the arc isolation structure 40 when the moving contact 11 is in the conducting position. At this time, the arc isolation structure 40 is located on one side of the moving contact 11 and the static contact 21, so that the moving contact 11 and the static contact 21 can reliably contact each other and form conduction. The arc isolation position refers to the position of the arc isolation structure 40 when the moving contact 11 is in the disconnecting position. At this time, the arc isolation structure 40 is located between the disconnected moving contact 11 and the static contact 21, forming a physical isolation barrier and increasing the creepage distance between the moving contact 11 and the static contact 21. The arc isolation member 4 of this embodiment is a cover-shaped structure, and the arc isolation structure 40 is an arc-shaped plate-shaped structure on the arc isolation member 4. The arc isolation member 4 rotates with the rotation of the contact support 3, thereby forming a semi-enclosure around the static contact 21 when the moving contact 11 and the static contact 21 are disconnected. The arc isolation structure 40 moves between the static contact 21 and the moving contact 11 to separate the static contact 21 from the moving contact 11. In other embodiments, the arc isolation member 4 may also be of other structures, as long as it is ensured that the arc isolation structure 40 can enter between the moving and static contacts to form a physical isolation barrier as the moving and static contacts are disconnected.

[0036] The arc striking member 12 moves synchronously with the moving contact 11. Therefore, when the moving contact 11 moves in the disconnecting direction, the arc striking member 12 also moves synchronously away from the static contact 21, thereby directing the arc away from the static contact 21 and toward the arc extinguishing chamber (the arc extinguishing chamber is not shown in the figure), whereupon the arc is interrupted by the arc isolation structure 40. Thus, the arc striking member 12 directing the arc toward the arc extinguishing chamber can reduce the difficulty of interrupting the arc by the arc isolation structure 40, shorten the time it takes for the arc to be interrupted and extinguished, and thus shorten the arc extinguishing time of the switch unit, thereby improving the arc extinguishing performance of the switch electrical device.

[0037] The contact support 3 and the arc-isolating member 4 in the above-mentioned embodiment are linked by a gear transmission mechanism. In other embodiments, the contact support 3 and the arc-isolating member 4 can also be linked by a pushing portion and an elastic reset member. The pushing portion is provided on the contact support 3 to push the arc-isolating member to move unidirectionally between the avoidance position and the arc-isolating position, and the elastic reset member - more specifically, a torsion spring provided on the rotating shaft of the arc-isolating member 4 - is used to push the arc-isolating member to reset. For example, the pushing portion of the contact support pushes the arc-isolating member to switch from the avoidance position to the arc-isolating position, and the elastic reset member is used to drive the arc-isolating member to reset from the arc-isolating 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 yield structure 13. The yield structure 13 is disposed on a side of the movable contact assembly 1 facing the arc isolation structure 40 and is configured to be located on the motion trajectory of the arc isolation structure 40, thereby providing a preliminary yield for the arc isolation structure 40. More specifically, when the movable contact assembly 1 is mounted on the contact support 3 and disposed on the fixing seat 5, the yield structure 13 is located on the side of the movable contact assembly 1 facing the arc isolation structure 40. When the arc isolation structure 40 is in the avoidance position and the movable contact assembly 1 is in the conducting position, the yield structure 13 is located on the motion trajectory of the arc isolation structure 40, so that the distal end of the arc isolation structure 40 can be disposed at the yield structure 13, thereby providing a preliminary yield for the arc isolation structure 40. The preparatory yielding mentioned in the present invention means that when the arc-isolating structure 40 is in the yielding position, the end of the arc-isolating structure 40 is closer to the direction of the switching position with the aid of the yielding structure 13, that is, closer to the contact point between the moving contact 11 and the static contact 21, so that the arc-isolating structure 40 can enter between the moving contact 11 and the static contact 21 earlier, thereby forming a physical isolation barrier between the moving contact 11 and the static contact 21 earlier, shortening the time of switching from the yielding position of the arc-isolating member 4 to the arc-isolating position. The contact point between the moving contact 11 and the static contact 21 refers to the position where the moving contact 11 and the static contact 21 form electrical contact when the moving and static contacts are turned on, and the position is not limited to a point or an area. More specifically, refer to Figures 2 to 4 As shown, the clearance structure 13 is formed by a notch provided on the edge of the movable contact assembly 1. In one embodiment, the notch forming the clearance structure 13 is a first notch 112 provided on the movable contact 11. The first notch 112 is located on the side of the movable contact 11 facing the arc isolation structure 40. Figure 8As shown, in another embodiment, the notches forming the yield structure 13 include a first notch 112 provided on the moving contact 11 and a second notch 1211 provided on the arc-striking plate portion 121 of the arc-striking member 12. In the direction of the relative position of the moving contact 11 and the arc-striking plate portion 121—that is, in the inward and outward directions—the first notch 112 and the second notch 1211 overlap. The presence of the second notch 1211 allows the width of the arc-striking plate portion 121 to be set larger. The second notch 1211 only needs to be provided at the position corresponding to the first notch 112, thereby increasing the area of the arc-striking plate portion 121 and improving the arc-striking effect.

[0039] Because the movable contact assembly 1 includes a notch that forms the relief structure 13, the end of the arc-isolating structure 40 can be closer to the contact point between the movable contact 11 and the static contact 21 when the movable and static contacts are conducting. The arc-isolating structure 40 is indirectly linked to the movable contact 11 via the contact support 3, meaning the two move synchronously. When the movable contact 11 moves away from the static contact 21, the arc-isolating structure 40, with the aid of the relief structure 13, can enter the movable contact 11 and the static contact 21 earlier and begin cutting the arc. This creates a physical isolation barrier between the movable contact 11 and the static contact 21 earlier, reducing the arc burning time, shortening the arc extinguishing time of the switch unit, and improving the arc extinguishing performance of the switch electrical device.

[0040] See Figures 3 and 4 As shown, the inner side of the moving contact 11 serves as the contact surface for conducting with the stationary contact 21. The moving contact 11 is provided with two guide surfaces 113 on the plane where the contact surface is located. The two guide surfaces 113 are located on either side of the moving contact 11. The guide surfaces 113 are used to guide the relative movement of the moving contact 11 and the stationary contact 21, allowing the stationary contact 21 to enter between the two moving contacts 11 more smoothly. In this embodiment, the guide surfaces 113 are inclined surfaces; in other embodiments, the guide surfaces can also be curved surfaces. During operation, only the guide surface 113 closest to the stationary contact 21 serves as a motion guide; the other guide surface 113 ensures that the moving contact 11 maintains balanced motion. A first notch 112 is provided on the guide surface 113 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 establish an electrical connection with the stationary contact 21. Therefore, the first notch 112 provided 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 movable contact 11 , and the guide surface 113 on the movable contact 11 is a symmetrical structure. Therefore, the first notch 112 plays a foolproof role during the installation of the movable contact assembly 1 to prevent the movable contact assembly 1 from being installed upside down.

[0041] The notch is a rectangular, triangular, or semicircular structure located in the middle of the edge. In the above embodiment, the first notch 112 and the second notch 1211 are each rectangular structures for ease of molding. They are formed along the edge of the movable contact assembly 1 in the direction of rotation and are located in the radial middle of the movable contact assembly 1. Therefore, the notch is a certain distance away from the radial end of the movable contact assembly 1. To ensure a sufficiently large contact area between the movable contact 11 and the static contact 21, the movable and static contacts extend toward each other for a certain length. Therefore, when the arc isolation structure 40 is in the avoidance position, the end of the arc isolation structure 40 corresponds to the radial middle of the movable contact assembly 1. Compared to extending the notch to the end of the movable contact assembly 1, setting the notch in the middle of the movable contact assembly 1 has a smaller impact on the volume of the movable contact 11, maintaining the good electrical performance of the movable 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 the contact surface for conducting with the static contact. In other embodiments, there may be one moving contact 11, and accordingly, one of the side surfaces of the moving contact 11 forms the contact surface, and the arc-striking plate portion 121 of the arc-striking 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 shaft portion 31 is cylindrical with a recessed structure 312 on its outer surface. As the arc isolation structure 40 moves from the avoidance position to the arc isolation position, the recessed structure 312 rotates to a position opposite the static contact 21, thereby increasing the distance between the shaft portion 31 and the static contact 21, making way for the arc isolation structure 40 and preventing motion interference between the arc isolation structure 40 and the static contact 21. If the shaft portion 31 lacks the recessed structure 312 and instead has a complete annular outer surface, to prevent motion interference between the arc isolation structure 40 and the static contact 21, the outer diameter of the shaft portion 31 must be reduced or the static contact 21 must be positioned further from the moving contact 11. A smaller outer diameter of the shaft portion 31 is detrimental to the stable installation of the moving contact assembly 1 and the strength of the shaft portion 31. Positioning the static contact 21 further from the moving contact 11 reduces the contact area between the moving and static contacts, thereby reducing the current flowing through the switch unit. Therefore, the presence of the recessed structure can also ensure the conductive performance of the switch, so that it meets the requirements of large current switching.

[0044] In the above embodiment, the movable contact assembly 1 is disposed on the contact support 3 and is driven by the contact support 3 to rotate, thereby switching the movable contact 11 and the stationary contact 21. The movable contact assembly 1 also forms an indirect linkage relationship with the arc isolation structure 40 through the contact support 3. In other embodiments, the movable contact assembly 1 may also perform other movements to switch the movable and stationary contacts, such as linear translation. Accordingly, the movable contact assembly 1 may also form a linkage relationship with the arc isolation structure 40 through other linear translation mechanisms. For example, the linear translation mechanism may include a rack structure, and the arc isolation cover may include a gear structure, which uses the rack and gear structure to form a linkage relationship between the movable contact assembly 1 and the arc isolation structure 40.

[0045] See Figures 5 to 7 As shown, the contact support 3 is rotatably connected to the fixed seat 5, so that the moving contact assembly 1 and the fixed seat 5 form a connection relationship of relative motion. The arc-isolating member 4 is also rotatably connected to the fixed seat 5, and the moving contact assembly 1 and the arc-isolating member 4 form an indirect linkage through the contact support 3. The static contact assembly 2 is fixedly mounted on the fixed seat 5, and each static contact assembly 2 includes a static contact 21, and the end of the static contact 21 is a static contact part 20 for forming an electrical connection with the moving contact part 10 of the moving contact assembly 1. In other embodiments, the moving contact part 10 and the static contact part 20 are not limited to two groups. It is also feasible to respectively set one moving contact part 10 and one static contact part 20 to form a group of contacts; accordingly, it is also feasible to respectively set more than two moving contact parts 10 and more than two static contact parts 20 to form more than two groups of contacts.

[0046] In one embodiment, the switching device having the above-mentioned contact system is an isolating switch. In other embodiments, the switching device may also be a circuit breaker.

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

Claims

1. A movable contact assembly, comprising a movable contact for forming an on / off engagement with a stationary contact, characterized in that: It also includes a yielding structure, which is arranged on a side of the moving contact assembly facing the arc isolation structure and is located on the movement trajectory of the arc isolation structure to prepare for yielding to the arc isolation structure.

2. The dynamic contact assembly according to claim 1, characterized in that: The preliminary yielding position is configured to enable the arc isolation structure to shorten the time it takes to switch from the avoidance position to the arc isolation position.

3. The dynamic contact assembly according to claim 1, characterized in that: The yield structure is formed by a notch arranged on the edge of the dynamic contact component.

4. The dynamic contact assembly according to claim 3, characterized in that: It also includes an arc-striking piece, which has an arc-striking plate portion arranged on one side of the moving contact, and the notch includes a first notch arranged on the moving contact and a second notch arranged on the arc-striking plate portion. In the direction of the relative position of the moving contact and the arc-striking plate portion, the first notch and the second notch overlap.

5. The dynamic contact assembly according to claim 3, characterized in that: One side surface of the moving contact is a contact surface for conducting the static contact. 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 static contact to move relatively close to each other. The notch includes a first notch provided on the moving contact, and the first notch is provided at the guide surface for motion guidance.

6. The dynamic contact assembly according to claim 3, characterized in that: The notch is a rectangular, triangular or semicircular structure arranged in the middle of the edge.

7. A switch unit, characterized in that: The movable contact assembly comprises any one of claims 1 to 6, wherein the movable contact assembly is arranged on a contact support, and further comprises a static contact and an arc-isolating structure linked to the contact support, wherein the movable contact of the movable contact assembly is driven by the contact support to form an on / off cooperation with the static contact, and the arc-isolating structure is driven by the contact support to switch between an avoidance position and an arc-isolating position, and when the arc-isolating structure is in the avoidance position, the yielding structure of the movable contact assembly is located on the movement trajectory of the arc-isolating structure from the avoidance position toward the arc-isolating position, and the end of the arc-isolating structure is located at the yielding structure, thereby forming the preparatory yielding.

8. The switch unit according to claim 7, characterized in that: The static contact is fixedly arranged on a fixed seat, the contact support is a turntable member rotatably connected to the fixed seat, the arc isolation structure is formed on an arc isolation member movably connected to the fixed seat, the arc isolation member switches between the avoidance position and the arc isolation position under the rotation action of the turntable member, and the yielding structure is arranged on one side of the rotation direction of the moving contact component.

9. The switch unit according to claim 8, characterized in that: The turntable member includes a rotating shaft portion, which is a cylinder with a concave structure on the outer side. The concave structure rotates to a position opposite to the static contact as the arc isolation structure moves from the avoidance position to the arc isolation position, thereby forming a movement to give way for the arc isolation structure.

10. A switch electrical device, characterized in that: The switch unit comprises any one of claims 7 to 9.

11. The switch device according to claim 10, characterized in that: The switching device is an isolating switch or a circuit breaker.

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