Electric switch operating device

Abstract

In a switch, the closing operation is accelerated just before the contacts are closed. [Solution] An operating shaft (33) rotates around its axis to rotate an opening / closing shaft (22) of a switch (11), thereby closing the switch (11) and closing the circuit. A motor (34) rotates the operating shaft (33). An assist lever (35) is connected to the operating shaft (33). A lifting frame (36) can be raised and lowered, and rotates the assist lever (35) when raised. An assist spring (37) urges the lifting frame (36) upward. An energy storage cam (38) lowers the lifting frame (36) against the repulsive force of the assist spring (37) as the motor (34) rotates. A latch (39) holds the lifting frame (36) in the lowered position. A release trigger (40) releases the latch (39) by the rotation of the motor (34) just before closing the contact.

Description

[Technical Field]

[0001] The present invention relates to an electrically operated operating device for a switch. [Background technology]

[0002] Patent Document 1 discloses an electrically operated operating device that is provided in a switch and closes a circuit by driving a motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4723900 Summary of the Invention [Problem to be solved by the invention]

[0004] In high-voltage circuits, an arc occurs just before the contacts close during the closing operation, so closing must be completed quickly. To achieve this, it is possible to increase the size of the motor or reduce the gear reduction ratio, but since the closing operation is only desired just before the contacts close, these are not efficient solutions. An object of the present invention is to speed up the closing operation of an electrically operated switchgear just before contact closing. [Means for solving the problem]

[0005] An electric operating device for a switch according to one aspect of the present invention includes an operating shaft, a motor, an assist lever, a lifting frame, an assist spring, an energy storage cam, a latch, and a release trigger. The operating shaft rotates around its axis to rotate the opening / closing shaft of the switch, thereby closing the switch and closing a circuit. The motor rotates the operating shaft. The assist lever is connected to the operating shaft. The lifting frame is movable up and down and rotates the assist lever when raised. The assist spring urges the lifting frame upward. The energy storage cam lowers the lifting frame against the repulsive force of the assist spring as the motor rotates. The latch holds the lifting frame in the lowered position. The release trigger releases the latch as the motor rotates just before closing the contact. [Effects of the Invention]

[0006] According to the present invention, the lifting frame is raised just before closing the contacts, and the operating shaft is rotated via the assist lever, so that the closing operation can be accelerated just before closing the contacts. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 10 is a diagram showing an energy storage cam and a release trigger. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. [Figure 14] FIG. 10 shows a holder and a latch. [Figure 15] FIG. 2 is a diagram showing the electric operating device before being turned on. [Figure 16] FIG. 2 is a diagram showing the electric operating device before being turned on. [Figure 17] FIG. 10 is a diagram showing the main lever and the main cam before closing. [Figure 18] FIG. 10 is a diagram showing the electric operating device at the start of energy storage. [Figure 19] FIG. 10 is a diagram showing the electrically operated operating device at the end of energy storage. [Figure 20] FIG. 10 is a diagram showing the electrically operated operating device at the end of energy storage. [Figure 21] FIG. 10 is a view showing the main lever and the main cam at the start of closing. [Figure 22] 10A and 10B are diagrams illustrating the electric operating device when the assist lever passes through. [Figure 23] 10A and 10B are diagrams showing the electric operating device when the assist lever passes through. [Figure 24] FIG. 10 is a diagram showing the electrically operated operating device immediately before closing the contacts. [Figure 25] FIG. 10 is a diagram showing the electrically operated operating device immediately before closing the contacts. [Figure 26] FIG. 10 is a view showing the electrically operated operating device when the latch is released. [Figure 27] FIG. 10 is a view showing the electrically operated operating device when the latch is released. [Figure 28] FIG. 10 is a view showing the electrically operated operating device when the latch is released. [Figure 29] FIG. 10 is a diagram showing the electrically operated operating device when the electrodes are closed. [Figure 30] FIG. 10 is a diagram showing the electrically operated operating device when the electrodes are closed. [Figure 31] FIG. 10 is a diagram showing the electrically operated operating device when the electrodes are closed. [Figure 32] FIG. 10 is a diagram showing the electrically operated operating device when the electrodes are closed. [Figure 33]FIG. 10 is a view showing the main lever and the main cam when the closing contact is completed. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the drawings are schematic and may differ from the actual product. Furthermore, the following embodiments exemplify devices and methods for embodying the technical concept of the present invention, and are not intended to limit the configuration to the following. In other words, the technical concept of the present invention can be modified in various ways within the technical scope described in the claims.

[0009] <<Embodiment>> "composition" In the following description, the three mutually orthogonal directions will be referred to as the width direction, depth direction, and up-down direction for the sake of convenience. FIG. 1 is a diagram showing the switch 11 in an interrupted state. Here, the switch 11 is shown as viewed from one side in the width direction, from the front side in the depth direction, and from above in the up-down direction. FIG. 2 is a diagram showing the switch 11 in the closed state. Here, the switch 11 is shown as viewed from one side in the width direction, from the front side in the depth direction, and from above in the up-down direction. The switch 11 is a load break switch (LBS) with a current-limiting fuse used to open and close high-voltage equipment and electrical circuits such as transformers and capacitors, and is equipped with a fixed contact 12, a movable contact 13, and an arc extinguishing chamber 14 for each pole.

[0010] The fixed contact 12 is not shown in the drawing because it is housed in an arc extinguishing chamber 14, but is connected to a primary side connection terminal 16 on the power supply side. The movable contact 13 is connected to a secondary connection terminal 18 on the load side via a current-limiting fuse 17, and rotates to come into contact with and separate from the fixed contact 12. The switch 11 has an opening / closing shaft 22 extending in the width direction, and when the opening / closing shaft 22 rotates around its axis by operating the handle 21, the operating rod 23 is pushed and pulled by the crank mechanism, and the three-pole movable contact 13 rotates in conjunction with it. The arc-extinguishing chamber 14 accommodates the fixed contact 12 and extinguishes the arc when it is interrupted by a narrow gap in the width direction. The switch 11 is provided with an electric operating device 31 that electrically operates the opening and closing shaft 22. The electric operating device 31 is supported on a base plate 32, and electrically operates the opening and closing shaft 22 to close the circuit.

[0011] FIG. 3 is a diagram showing the arc-extinguishing chamber 14. As shown in FIG. This figure shows a cross section of the arc extinguishing chamber 14 along the width and depth directions, as viewed from above in the vertical direction. The arc extinguishing chamber 14 is made of insulating resin. A narrow gap slightly larger than the plate thickness of the movable contactor 13 is formed at the front of the arc extinguishing chamber 14 in the depth direction. The fixed contactor 12 is housed at the rear of the arc extinguishing chamber 14 in the depth direction and is fixed to the connection terminal 16. The fixed contactor 12 is made of conductive metal and is formed by bending a single plate material. When viewed from the top and bottom, the fixed contactor 12 has a roughly U-shape that opens toward the front in the depth direction. The tip ends of both ends are bent back in the depth direction by a U-shape to form a pair of elastic pieces facing each other in the width direction. When no external load is applied, the gap between the elastic pieces is slightly smaller than the thickness of the movable contactor 13.

[0012] FIG. 4 is a diagram showing the arc-extinguishing chamber 14 and the movable contact 13. As shown in FIG. Here, the arc extinguishing chamber 14 and the movable contactor 13 are shown as viewed from one side in the width direction. The arc extinguishing chamber 14 is shown as a cross section passing through the center of the width direction and along the depth direction and the up-down direction, as viewed from one side in the width direction. The movable contactor 13 is plate-shaped along the depth direction and the up-down direction, and is formed in a substantially V-shape when viewed from the width direction. The movable contactor 13 has a boss hole 26 formed at its base end and a connecting hole 27 formed at a position radially outward from the boss hole 26. The boss hole 26 penetrates in the width direction, and a rotation shaft (not shown) is inserted through the connecting hole 27. The connecting hole 27 also penetrates in the width direction, and an operating rod 23 is connected to the boss hole 26. The movable contactor 13 rotates around the boss hole 26 as the operating rod 23 retreats in the depth direction. When the tip of the movable contactor 13 is inserted into the fixed contactor 12, the movable contactor 13 closes the contacts and closes the circuit.

[0013] Next, the electric operating device 31 will be described. FIG. 5 is a diagram showing the electric operating device 31. As shown in FIG. Here, the electric operating device 31 is shown as viewed from one side in the width direction, from the front side in the depth direction, and from above in the up-down direction. FIG. 6 is a diagram showing the electric operating device 31. As shown in FIG. Here, the electric operating device 31 is shown as viewed from the other side in the width direction, the front side in the depth direction, and from above in the up-down direction. The base plate 32 has flat surfaces that extend in the depth direction and the up-down direction, and brackets 51 and 52 are fixed to the surface facing the other width direction. The brackets 51 and 52 each have flat surfaces that extend in the depth direction and the up-down direction at positions away from the base plate 32 in the other width direction. A pair of holders 53 are fixed to the bracket 52.

[0014] The electric operating device 31 includes an operating shaft 33, a motor 34, an assist lever 35, a lifting frame 36, an assist spring 37, an energy storage cam 38, a latch 39, a release trigger 40, a main lever 41, a main cam 42, a gear 43, and an abutment pin 44. The operating shaft 33 extends in the width direction and is rotatably supported by the base plate 32 and the bracket 51, and an operating lever 56 is connected to it on one side of the base plate 32 in the width direction. When the operating shaft 33 rotates around its axis, the operating lever 56 pushes up the handle 21, thereby rotating the opening / closing shaft 22. The opening / closing shaft 22 and the operating shaft 33 are arranged coaxially. The motor 34 is fixed to a surface of the base plate 32 facing one side in the width direction, and has a rotating shaft that penetrates the base plate 32 and extends to the other side in the width direction, and rotates the operating shaft 33 by transmitting power via gears and cams.

[0015] The assist lever 35 is connected to the operating shaft 33. The lifting frame 36 is supported by a bracket 51 so that it can be raised and lowered, and when it rises, it pushes up and rotates the assist lever 35. The assist spring 37 is a pair of compression coil springs aligned in the depth direction, interposed between the lifting frame 36 and a pair of holders 53, and urges the lifting frame 36 upward. The energy storage cam 38 lowers the lifting frame 36 against the repulsive force of the assist spring 37 as the motor 34 rotates. The latch 39 is rotatably supported by the pair of holders 53 and holds the lifting frame 36 in the lowered position. The release trigger 40 is behind the bracket 51 and is not shown in the figure, but it releases the latch 39 as the motor 34 rotates just before the contacts close.

[0016] The main lever 41 is connected to the operating shaft 33 between the base plate 32 and the bracket 51. The main cam 42 is not shown in the figure because it is behind the bracket 51, but it rotates the main lever 41 when the motor 34 rotates. The gear 43 has a rotation axis extending in the width direction and is rotatably supported by the base plate 32 and the bracket 51. The gear 43 meshes with a gear fixed to the rotation axis of the motor 34, thereby transmitting rotation. The abutment pin 44 is fixed to the bracket 51, protrudes to the other side in the width direction, and interferes when the lifting frame 36 is lifted.

[0017] FIG. 7 is a diagram showing the operating shaft 33. As shown in FIG. FIG. 1(a) shows the power transmission path from the motor 34 to the operating shaft 33 as viewed from above in the vertical direction. The axis Ax1 of the motor 34, the axis Ax2 of the gear 43, and the axis Ax3 of the operating shaft 33 are all parallel to one another. The operating lever 56 is connected to one side of the operating shaft 33 in the width direction, the main lever 41 is connected to the center of the width direction, and the assist lever 35 is connected to the other side of the width direction. The main cam 42 is connected to one side of the rotation shaft of the gear 43 in the width direction, the gear 43 is connected to the center of the width direction, and the energy storage cam 38 is connected to the other side of the width direction. The gear 43 is engaged with the rotation shaft of the motor 34.

[0018] 1B shows the main lever 41 and the main cam 42 as viewed from the other side in the width direction, the front side in the depth direction, and the top side in the up-down direction. The main lever 41 extends radially outward from the axis Ax3 and is formed like a plate along the depth direction and the up-down direction. A cam follower 57 is rotatably supported on the radially outer side of the surface facing the other side in the width direction. The main cam 42 extends radially outward from the axis Ax2 and is formed like a plate along the depth direction and the up-down direction. The cam follower 57 and the main cam 42 are located at the same position in the width direction. When viewed from the other side in the width direction, the motor 34 rotates clockwise, and the gear 43 and the main cam 42 rotate counterclockwise. When the main cam 42 abuts against the cam follower 57 and lifts the main lever 41, the operating shaft 33 rotates clockwise.

[0019] FIG. 8 is a diagram showing the energy storage cam 38 and the release trigger 40. As shown in FIG. FIG. 1A shows the energy storage cam 38 and the release trigger 40 as viewed from the other side in the width direction, the front side in the depth direction, and the top side in the up-down direction. FIG. 1B shows the energy storage cam 38 and the release trigger 40 as viewed from the other side in the width direction. The energy storage cam 38 is connected to the rotation shaft of the gear 43, has a plate shape along the depth direction and the up-down direction, and is formed in an oval shape as viewed from the width direction. When viewed from the other side in the width direction, the energy storage cam 38 rotates counterclockwise together with the gear 43, and serves as a driving link that raises and lowers the lifting frame 36 according to the rotation angle. The release trigger 40 is formed in a plate shape along the depth direction and the up-down direction, extending in an arc shape radially outward from the axis Ax2, with the circumferential center being convex radially outward, and is fastened to the radially outer side of the surface of the gear 43 facing the other side in the width direction. The release trigger 40 rotates counterclockwise together with the gear 43 when viewed from the other side in the width direction, and rotates the latch 39 in accordance with the angle of rotation.

[0020] FIG. 9 is a diagram showing the lifting frame 36. As shown in FIG. Here, the lifting frame 36 is shown as viewed from the other side in the width direction, the front side in the depth direction, and from above in the up-down direction. FIG. 10 is a diagram showing the lifting frame 36. As shown in FIG. Here, the lifting frame 36 is shown as viewed from the other side in the width direction, from the far side in the depth direction, and from below in the vertical direction. The lifting frame 36 includes an upper plate 61 , a lower plate 62 , a cam lever 63 , and a return spring 64 .

[0021] The upper plate 61 is supported by the bracket 51 in a state in which it can be raised and lowered up and down, is a cam receiver located below the energy storage cam 38, and serves as a follower that rises and falls up and down according to the rotation angle of the energy storage cam 38. The lower plate 62 is a spring receiver that supports the upper end of the assist spring 37, and is also a latch receiver in which an engagement recess 66 that can engage with the latch 39 is formed. The cam lever 63 has a rotation shaft that extends in the width direction, and is rotatably supported by the upper plate 61 and the lower plate 62. The cam lever 63 is located at the same position in the width direction as the assist lever 35, and when the upper plate 61 and the lower plate 62 rise, it pushes up the assist lever 35 and rotates the operating shaft 33. The return spring 64 is a compression coil spring that urges the cam lever 63 in a clockwise rotation direction when viewed from the other side in the width direction.

[0022] FIG. 11 is a diagram showing the cam lever 63. As shown in FIG. 1A shows the cam lever 63 as viewed from the other side in the width direction, the front side in the depth direction, and the top side in the up-down direction. FIG. 1B shows the cam lever 63 as viewed from the other side in the width direction. The cam lever 63 is formed as a plate extending in the up-down direction and along the up-down and depth directions, and its lower end is rotatably supported by a support shaft 71 (lever support shaft). The support shaft 71 is a sems bolt with an axis Ax4 extending in the width direction. The cam lever 63 is formed with a tail portion 72, a nose portion 73, and a notch 74. The tail portion 72 protrudes from the lower end of the cam lever 63 toward the front side in the depth direction, radially outward of the support shaft 71, and its tip side is displaced upward via a step. A return spring 64 is interposed between the tip of the tail portion 72 and the upper plate 61, urging the cam lever 63 to rotate clockwise when viewed from the other side in the width direction. The nose portion 73 protrudes from the lower end of the cam lever 63 toward the depth direction radially outward of the support shaft 71, and is formed at an acute angle by a base that runs along the depth direction when viewed from the width direction and a slanted side that points upward toward the front in the depth direction. The notch portion 74 is formed on the end surface facing the front in the depth direction at the bottom of the cam lever 63, and is concave in a roughly semicircular shape toward the back in the depth direction when viewed from the width direction.

[0023] FIG. 12 is a diagram showing the upper plate 61 and the lower plate 62. As shown in FIG. 1A shows the separated upper and lower plates 61 and 62 as viewed from the other side in the width direction, the far side in the depth direction, and from above in the vertical direction. FIG. 1B shows the fastened upper and lower plates 61 and 62 as viewed from the other side in the width direction, the far side in the depth direction, and from above in the vertical direction. The upper plate 61 extends in the depth direction and is flat along both the depth and width directions. The energy storage cam 38 contacts one side of the upper surface at the center in the depth direction. The other side of the width direction of the upper plate 61 has a stepped portion with the front side in the depth direction displaced to one side in the width direction, and a stopper 76 is formed on the upper surface of the stepped portion. The stopper 76 abuts against the nose portion 73 of the cam lever 63 biased by the return spring 64 to regulate the rotational position of the cam lever 63. The upper plate 61 has a support plate 77 bent upward at a right angle from one end in the width direction. The support plate 77 is a flat plate extending in the vertical and depth directions and is supported by the bracket 51 in a state in which it can be raised and lowered in the vertical direction. The lower plate 62 is a flat plate extending in the depth direction and extending in the depth and width directions, and supports the upper end of the assist spring 37 on its lower surface. An engagement recess 66 is formed in the center of the lower plate 62 in the depth direction. The engagement recess 66 is a generally square-shaped tongue that protrudes downward. The upper plate 61 and the lower plate 62 are fastened together in an overlapping manner and rotatably support the cam lever 63 by a support shaft 71 along the axis Ax4.

[0024] FIG. 13 is a diagram showing the latch 39. As shown in FIG. FIG. 1A shows the latch 39 as viewed from the other side in the width direction, the front side in the depth direction, and the top side in the up-down direction. FIG. 1B shows the latch 39 as viewed from the front side in the depth direction. The latch 39 extends in the up-down direction, and its upper side is rotatably supported by a support shaft 81 (latch support shaft). The support shaft 81 is a pin with an axis Ax5 extending in the depth direction. A flange is formed at the base end, which is the front side in the depth direction, and a retaining ring is fixed to the tip, which is the back side in the depth direction. The latch 39 is formed with an engagement protrusion 82 and an arm portion 83. The engagement protrusion 82 protrudes from the upper end of the latch 39 toward the other side in the width direction and is engageable with the engagement recess 66. The arm portion 83 protrudes from the upper side of the latch 39 toward one side in the width direction, which is radially outward of the support shaft 81. The arm portion 83 is located on the orbit of the release trigger 40 which rotates together with the gear 43, and is pushed downward according to the rotation angle of the release trigger 40, causing the latch 39 to rotate counterclockwise when viewed from the front in the depth direction.

[0025] FIG. 14 is a view showing the holder 53 and the latch 39. As shown in FIG. 1A shows the holder 53 and latch 39 as viewed from the other side in the width direction, the front side in the depth direction, and from above in the vertical direction. FIG. 1B shows the holder 53 and latch 39 as viewed from the other side in the width direction, the front side in the depth direction, and from below in the vertical direction. The latch 39 is rotatably supported by a pair of holders 53 via a support shaft 81. The pair of holders 53 support the lower end of the assist spring 37 on the upper surface of the flat portion along the depth direction and the width direction. A tension coil spring 86 is attached to the lower end of the bracket 52 and the lower end of the latch 39. The tension coil spring 86 pulls the lower end of the latch 39 in one direction in the width direction and downward in the vertical direction, thereby biasing the latch 39 in a clockwise rotation direction as viewed from the front side in the depth direction. When the latch 39's lower side below the support shaft 81 abuts against the bracket 52, its clockwise rotation as viewed from the front side in the depth direction is restricted, and it assumes an upright position extending in the vertical direction.

[0026] 《Operation》 Next, the closing operation will be described. In the following description, illustrations of secondary components such as the assist spring 37, the return spring 64, the tension coil spring 86, the base plate 32, the bracket 51, and the bracket 52 will be omitted. (1) Before injection FIG. 15 is a diagram showing the electric operating device 31 before being turned on. Here, the state of the electric operating device 31 before being turned on is shown as seen from the other side in the width direction, the front side in the depth direction, and from above in the up-down direction. FIG. 16 is a diagram showing the electric operating device 31 before being turned on. Here, the electric operating device 31 is shown as seen from the other side in the width direction before being turned on. The lower plate 62 is partially cut along a cut surface along the depth direction and the up-down direction so that the entire cam lever 63 is visible.

[0027] The lifting frame 36 is at its highest position, and the abutment pin 44 abuts against the tail portion 72, causing the cam lever 63 to tilt counterclockwise when viewed from the other side in the width direction. The main lever 41 and the assist lever 35 have lowered to a predetermined angle due to their own weight, and the tip side of the assist lever 35 is in the clockwise rotation direction of the cam lever 63 when viewed from the other side in the width direction. FIG. 17 is a diagram showing the main lever 41 and the main cam 42 before closing. Here, the main lever 41 and the main cam 42 before closing are shown as viewed from the other side in the width direction. When viewed from the other side of the width direction, there is a cam follower 57 in the counterclockwise rotation direction of the main cam 42, and the main cam 42 needs to rotate by 180 degrees or more before it comes into contact with the cam follower 57.

[0028] (2)Start accumulating energy FIG. 18 is a diagram showing the electric operating device 31 at the start of energy storage. Here, the state of the electric operating device 31 at the start of charging is shown as seen from the other side in the width direction. A portion of the lower plate 62 is cut along a cut surface along the depth direction and the up-down direction so that the entire cam lever 63 is visible. When the motor 34 is rotated, the energy storage cam 38 rotates counterclockwise together with the gear 43 when viewed from the other side in the width direction. The contour of the energy storage cam 38 has a section that follows the base circle and a section that passes radially outward from the base circle. When the section that follows the base circle is in contact with the upper plate 61, the vertical position of the lifting frame 36 does not change, but when the section that passes radially outward from the base circle comes into contact with the upper plate 61, the lifting frame 36 descends against the repulsive force of the assist spring 37. When the lifting frame 36 starts to descend, the assist spring 37 is compressed and energy storage begins.

[0029] (3) End of energy storage FIG. 19 is a diagram showing the electrically operated operating device 31 when energy storage is completed. Here, the state of the electric operating device 31 at the end of charging is shown as seen from the other side in the width direction, the front side in the depth direction, and from above in the up-down direction. FIG. 20 is a diagram showing the electrically operated operating device 31 when energy storage is completed. Here, the electric operating device 31 is shown as viewed from the other side in the width direction when the charging is complete. The lower plate 62 is partially cut along a cross section along the depth direction and the up-down direction so that the entire cam lever 63 can be seen.

[0030] When the lifting frame 36 is at its lowest position, the tail portion 72 separates from the abutment pin 44, causing the return spring 64 to push up the tail portion 72, and the cam lever 63 to rotate clockwise as viewed from the other side in the width direction. At this time, the nose portion 73 abuts against the stopper 76, causing the cam lever 63 to maintain its upright position extending in the vertical direction. As the lifting frame 36 descends, the engaging recess 66 pushes aside the engaging protrusion 82, causing the latch 39 to tilt counterclockwise against the tensile force of the tension coil spring 86 as viewed from the front in the depth direction. When the engaging recess 66 overcomes the engaging protrusion 82, the latch 39 rotates clockwise as viewed from the front in the depth direction due to the tensile force of the tension coil spring 86, and the engaging protrusion 82 engages with the engaging recess 66, maintaining the vertical position of the lifting frame 36.

[0031] (4) Start of pole closing FIG. 21 is a diagram showing the main lever 41 and the main cam 42 at the start of closing. Here, the main lever 41 and the main cam 42 are shown as viewed from the other side in the width direction at the start of closing. As the main cam 42 continues to rotate counterclockwise when viewed from the other side in the width direction, it comes into contact with the cam follower 57. When the main cam 42 rotates further from this state, the main lever 41 rotates clockwise via the cam follower 57, and the operating lever 56 also rotates clockwise via the operating shaft 33. When the operating lever 56 starts to rotate, the handle 21 is lifted and contact closing begins.

[0032] (5) Passing through assist lever 35 FIG. 22 is a diagram showing the electric operating device 31 when the assist lever 35 passes through. Here, the electric operating device 31 is shown as viewed from the other side in the width direction, the front side in the depth direction, and from above in the up-down direction when the assist lever 35 passes through. FIG. 23 is a diagram showing the electric operating device 31 when the assist lever 35 passes through. Here, the electric operating device 31 is shown as viewed from the other side in the width direction when the assist lever 35 passes through. A portion of the lower plate 62 is cut along a cut surface along the depth direction and the up-down direction so that the entire cam lever 63 is visible.

[0033] As the assist lever 35 rotates clockwise when viewed from the other side in the width direction, it pushes away the cam lever 63, causing the cam lever 63 to tilt counterclockwise against the repulsive force of the return spring 64. Because a notch 74 is formed in the cam lever 63, the cam lever 63 tilts while avoiding interference with the abutment pin 44, allowing the assist lever 35 to pass through. After the assist lever 35 has passed through, the tail portion 72 is pushed up by the return spring 64, causing the cam lever 63 to rotate clockwise. At this time, the nose portion 73 abuts against a stopper 76, causing the cam lever 63 to return to an upright position extending in the vertical direction.

[0034] (6) Just before closing FIG. 24 is a diagram showing the electric operating device 31 immediately before closing the contacts. Here, the state of the electric operating device 31 immediately before closing is shown as viewed from the other side in the width direction, the front side in the depth direction, and the bottom side in the vertical direction. FIG. 25 is a diagram showing the electric operating device 31 immediately before closing the contacts. Here, the state of the electric operating device 31 just before closing is shown as seen from the other side in the width direction. The lower plate 62 is partially cut along cut planes along the depth direction and the up-down direction so that the entire cam lever 63 is visible. When viewed from the other side in the width direction, as the gear 43 rotates counterclockwise, the release trigger 40 comes into contact with the arm portion 83 of the latch 39 .

[0035] (7) Unlatching FIG. 26 is a diagram showing the electrically operated operating device 31 when the latch is released. Here, the state of the electric operating device 31 when the latch is released is shown as seen from the other side in the width direction, the front side in the depth direction, and the bottom side in the up-down direction. FIG. 27 is a diagram showing the electrically operated operating device 31 when the latch is released. Here, the electric operating device 31 is shown in an unlatched state as viewed from the front in the depth direction. FIG. 28 is a diagram showing the electrically operated operating device 31 when the latch is released. Here, the state of the electric operating device 31 when the latch is released is shown as seen from the other side in the width direction. The lower plate 62 is partially cut along cut planes along the depth direction and the up-down direction so that the entire cam lever 63 is visible.

[0036] As the gear 43 continues to rotate counterclockwise when viewed from the other side in the width direction, the release trigger 40 pushes down the arm portion 83 of the latch 39, causing the latch 39 to tilt counterclockwise when viewed from the front in the depth direction. This disengages the engaging protrusion 82 from the engaging recess 66, releasing the latch 39. The lifting frame 36 rises due to the repulsive force of the energized assist spring 37, causing the cam lever 63 to push up the assist lever 35. This causes the assist lever 35 to rotate clockwise when viewed from the other side in the width direction. At this time, the lifting frame 36 rotates the assist lever 35 faster than the main cam 42 rotates the main lever 41. Therefore, the speed of closing caused by the rotation of the operating lever 56 accelerates.

[0037] (8) Closing FIG. 29 is a diagram showing the electrically operated operating device 31 in the closed state. Here, the state in which the electric operating device 31 is closed is shown as viewed from the other side in the width direction, the front side in the depth direction, and from above in the up-down direction. FIG. 30 is a diagram showing the electrically operated operating device 31 in the closed state. Here, the electric operating device 31 is shown when it is closed as viewed from the other side in the width direction. The lower plate 62 is partially cut along cut planes along the depth direction and the up-down direction so that the entire cam lever 63 is visible.

[0038] As viewed from the other side in the width direction, the operating lever 56 continues to rotate clockwise, and the tip of the movable contact 13 is inserted into the gap between the elastic pieces of the fixed contact 12, resulting in contact closure. As the lifting frame 36 continues to rise and the release trigger 40 passes the arm portion 83, the latch 39 rotates clockwise due to the tension of the tension coil spring 86, as viewed from the front in the depth direction. The latch 39's lower side below the support shaft 81 abuts against the bracket 52, restricting its clockwise rotation as viewed from the front in the depth direction, and it assumes an upright position extending in the vertical direction. At this point, the tail portion 72 has not yet abutted against the abutment pin 44, and the lifting frame 36 still has room to rise.

[0039] (9) Closed pole completed FIG. 31 is a diagram showing the electrically operated operating device 31 when the contacts are closed. Here, the state of the electric operating device 31 when the contacts are closed is shown as viewed from the other side in the width direction, the front side in the depth direction, and from above in the up-down direction. FIG. 32 is a diagram showing the electric operating device 31 when the contacts are closed. Here, the state of the electric operating device 31 when the contacts are closed is shown as seen from the other side in the width direction. The lower plate 62 is partially cut along cut planes along the depth direction and the up-down direction so that the entire cam lever 63 is visible.

[0040] Contact closure is completed when the movable contact 13 is fully inserted into the fixed contact 12. At this time, the lifting frame 36 reaches its highest position and the abutment pin 44 abuts against the tail portion 72, causing the cam lever 63 to tilt counterclockwise when viewed from the other side in the width direction. This allows the assist lever 35 to rotate counterclockwise when viewed from the other side in the axial direction. FIG. 33 is a diagram showing the main lever 41 and the main cam 42 when the contact closing is completed. Here, the main lever 41 and the main cam 42 are shown when the contact closing is completed, as viewed from the other side in the width direction. When viewed from the other side in the width direction, the gear 43 continues to rotate counterclockwise, and when the tip of the main cam 42 disengages from the cam follower 57, the main lever 41 and the assist lever 35 rotate counterclockwise by a predetermined angle due to their own weight, completing the series of insertion operations. The assist lever 35 waits in the clockwise rotation direction of the cam lever 63 as viewed from the other side in the width direction until the next insertion operation is started, and then returns to the state before insertion.

[0041] <<Action and Effect>> Next, the main effects of the embodiment will be described. The electric operating device 31 of the switch 11 includes an operating shaft 33, a motor 34, an assist lever 35, a lifting frame 36, an assist spring 37, an energy storage cam 38, a latch 39, and a release trigger 40. The operating shaft 33 rotates around its axis to rotate the opening / closing shaft 22 of the switch 11, thereby closing the switch 11 and closing the circuit. The motor 34 rotates the operating shaft 33. The assist lever 35 is connected to the operating shaft 33. The lifting frame 36 is movable up and down and rotates the assist lever 35 when raised. The assist spring 37 urges the lifting frame 36 upward. The energy storage cam 38 lowers the lifting frame 36 against the repulsive force of the assist spring 37 due to the rotation of the motor 34. The latch 39 holds the lifting frame 36 in the lowered position. The release trigger 40 releases the latch 39 by rotating the motor 34 just before closing. This causes the lifting frame 36 to rise just before closing, and rotates the operating shaft 33 via the assist lever 35. This makes it possible to speed up the closing operation just before closing. The speed of the closing operation can be set as desired by adjusting the repulsive force of the assist spring 37. The timing at which the closing operation is accelerated can be set as desired by adjusting the release trigger 40.

[0042] The electric operating device 31 includes a main lever 41 and a main cam 42. The main lever 41 is connected to an operating shaft 33. The main cam 42 rotates the main lever 41 by the rotation of a motor 34. As a result, the rotation of the motor 34 can rotate the operating shaft 33. The lifting frame 36 rotates the assist lever 35 faster than the main cam 42 rotates the main lever 41. This allows the closing operation to be accelerated just before the contacts are closed. The latch 39 is rotatably supported by a support shaft 81, is biased in one direction around the support shaft 81, and has an engaging protrusion 82 formed above the support shaft 81. The engaging protrusion 82 protrudes in one direction around the support shaft 81. The lifting frame 36 has an engaging recess 66 formed therein that can engage with the engaging protrusion 82. This allows the lifting frame 36 to be held in a lowered position.

[0043] The latch 39 is formed with an arm portion 83 that protrudes radially outward from the support shaft 81. The electric operating device 31 is equipped with a gear 43. The gear 43 rotates on a rotary shaft, and rotation of the motor 34 is transmitted to the gear 43. The release trigger 40 is fixed to the end face of the gear 43, and interferes with the arm portion 83 just before closing, thereby rotating the latch 39 in the other direction around the axis of the support shaft 81 and releasing the engagement between the engagement recess 66 and the engagement protrusion 82. This allows the latch 39 to be released by the rotation of the motor 34 just before closing. The assist springs 37 are provided one on each side of the latch 39. This allows the lifting frame 36 to be lifted and lowered stably. The energy storage cam 38 is connected to the rotation shaft of the gear 43. This allows the rotation of the motor 34 to be transmitted to the energy storage cam 38 in accordance with the reduction ratio of the gear 43.

[0044] The lifting frame 36 is equipped with a cam lever 63. The cam lever 63 extends in the vertical direction, has a lower end rotatably supported by a support shaft 71, and has a tail portion 72 that protrudes radially outward from the support shaft 71. The electric operating device 31 is equipped with an abutment pin 44. The abutment pin 44 is disposed higher than the tail portion 72. When the lifting frame 36 is raised to close the contact, the tail portion 72 of the cam lever 63 abuts against the abutment pin 44 and tilts to one side about the support shaft 71, thereby allowing the assist lever 35 to rotate toward the open side. This causes the assist lever 35 to rotate cyclically, preparing for the next closing operation. The lifting frame 36 is provided with a return spring 64. The return spring 64 biases the cam lever 63 in the other direction around the axis of the support shaft 71. This allows the cam lever 63 to return from the tilted state.

[0045] The cam lever 63 is formed with a nose portion 73. The nose portion 73 protrudes radially outward from the support shaft 71 on the opposite side from the tail portion 72. The lifting frame 36 is equipped with a stopper 76. The stopper 76 is disposed on the other side of the support shaft 71 in the axial direction relative to the nose portion 73. When the tail portion 72 is not in contact with the abutment pin 44, the cam lever 63 is biased by the return spring 64, causing the nose portion 73 to abut against the stopper 76, thereby maintaining an upright posture. This stabilizes the posture of the cam lever 63, suppresses rattles, and enables the force to be transmitted to the assist lever 35 efficiently. After closing the contacts, the assist lever 35 rotates to the open side and waits on the other side of the support shaft 71 around the axis of the cam lever 63 until the next closing operation is started. This makes it possible to prepare for the next closing operation.

[0046] When the tail portion 72 separates from the abutment pin 44 during the closing operation, the cam lever 63 is biased by the return spring 64 and returns to the upright position, thereby preparing for the assist lever 35 to be pushed up. During the closing operation, the cam lever 63 is pushed by the assist lever 35 and tilts to one side about the axis of the support shaft 71, thereby allowing the assist lever 35 to rotate to the closing side. As a result, the assist lever 35 passes through the cam lever 63 and waits above the cam lever 63, ready for the cam lever 63 to rise.

[0047] A notch 74 is formed in the cam lever 63. The notch 74 avoids interference with the abutment pin 44 when the cam lever 63 is pushed by the assist lever 35 and tilts to one side around the axis of the support shaft 71. This allows the assist lever 35 to smoothly pass through the cam lever 63. Note that in the embodiment, the notch 74 is provided in the cam lever 63, but it is also possible to prevent interference with the abutment pin 44 when the cam lever 63 tilts by thinning the entire cam lever 63, thinning the abutment pin 44, or increasing the distance between the cam lever 63 and the abutment pin 44. When the assist lever 35 passes through in the closing direction during the closing operation, the cam lever 63 is biased by the return spring 64 and returns to the upright position. This allows the cam lever 63 to prepare for rising.

[0048] Next, a comparative example will be described. Here, a comparative example will be described that includes only the motor 34, main lever 41, main cam 42, and gear 43. Other components are the same as those in the previously described embodiment, so detailed descriptions of the common components will be omitted. When the motor 34 is driven, the main cam 42 pushes up the main lever 41, thereby closing the circuit. However, since an arc occurs in the high-voltage circuit just before the contacts are closed during the closing operation, it is necessary to complete the closing quickly. Therefore, while it is conceivable to increase the size of the motor 34 or reduce the reduction ratio of the gear 43, these are not efficient solutions because the closing operation is only desired just before the contacts are closed.

[0049] Although the present invention has been described above with reference to a limited number of embodiments, the scope of the invention is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art. [Explanation of symbols]

[0050] 11...switch, 12...fixed contact, 13...movable contact, 14...arc extinguishing chamber, 16...connecting terminal, 17...current-limiting fuse, 18...connecting terminal, 21...handle, 22...opening / closing shaft, 23...operating rod, 26...boss hole, 27...coupling hole, 31...electric operating device, 32...base plate, 33...operating shaft, 34...motor, 35...assist lever, 36...lifting frame, 37...assist spring, 38...energy storage cam, 39...latch, 40...release trigger, 41... Main lever, 42...main cam, 43...gear, 44...abutment pin, 51...bracket, 52...bracket, 53...holder, 56...operating lever, 57...cam follower, 61...upper plate, 62...lower plate, 63...cam lever, 64...return spring, 66...engaging recess, 71...support shaft, 72...tail portion, 73...nose portion, 74...notch portion, 76...stopper, 77...support plate, 81...support shaft, 82...engaging protrusion, 83...arm portion, 86...tension coil spring

Claims

1. an operating shaft that rotates around its axis to rotate an opening / closing shaft of the switch, thereby closing the switch and closing the circuit; a motor that rotates the operating shaft; an assist lever connected to the operating shaft; a lifting frame that can be raised and lowered and rotates the assist lever when raised; an assist spring that urges the lifting frame upward; a storage cam that causes the lifting frame to descend against the repulsive force of the assist spring by rotation of the motor; a latch that holds the lift frame in a lowered position; a release trigger that releases the latch by rotation of the motor immediately before closing the contacts.

2. a main lever connected to the operating shaft; 2. The electrically operated switch according to claim 1, further comprising: a main cam that rotates the main lever by rotation of the motor.

3. 3. The electrically operated switch according to claim 2, wherein the lifting frame rotates the assist lever faster than the main cam rotates the main lever.

4. The latch is rotatably supported by a latch shaft, and is biased in one direction around the axis of the latch shaft. An engaging protrusion that protrudes in one direction around the axis of the latch shaft is formed above the latch shaft, 2. The electrically operated switch according to claim 1, wherein the lifting frame is formed with an engaging recess that can be engaged with the engaging protrusion.

5. The latch has an arm portion that protrudes radially outward from the latch support shaft, a gear that rotates on a rotation shaft and to which rotation of the motor is transmitted; The electric operating device for a switch according to claim 4, characterized in that the release trigger is fixed to an end face of the gear and interferes with the arm portion just before closing, thereby rotating the latch in the other direction around the axis of the latch support shaft and releasing the engagement between the engagement recess and the engagement protrusion.

6. 6. The electrically operated switch according to claim 5, wherein the assist springs are provided on both sides of the latch.

7. 6. The electrically operated switch according to claim 5, wherein the energy storage cam is connected to the rotary shaft.

8. The lifting frame is a cam lever extending in a vertical direction, a lower end side of which is rotatably supported by a lever spindle, and a tail portion formed to protrude radially outward from the lever spindle; a contact pin disposed above the tail portion, The electric operating device for a switch according to claim 1, characterized in that when the lifting frame rises to close the contact, the tail portion of the cam lever abuts against the abutment pin and tilts to one side about the axis of the lever support shaft, thereby allowing the assist lever to rotate to the opening side.

9. The lifting frame is 9. The electrically operated switch according to claim 8, further comprising a return spring for biasing the cam lever in the other direction around the axis of the lever support shaft.

10. The cam lever is formed with a nose portion that protrudes radially outward from the lever support shaft on the opposite side to the tail portion, The lifting frame is a stopper disposed on the other side of the lever spindle relative to the nose portion, 10. The electric operating device for a switch according to claim 9, wherein when the tail portion is not in contact with the abutment pin, the cam lever is biased by the return spring so that the nose portion abuts against the stopper, thereby maintaining the upright position.

11. The electric operating device for a switch according to claim 10, characterized in that the assist lever rotates to the opening side after closing and waits on the other side of the lever support shaft around the axis of the cam lever until the next closing operation is started.

12. 12. The electrically operated switch according to claim 11, wherein the cam lever is biased by the return spring to return to the upright position when the tail portion separates from the abutment pin during the closing operation.

13. The electric operating device for a switch according to claim 12, characterized in that the cam lever is pushed by the assist lever and tilts to one side about the axis of the lever support shaft during the closing operation, thereby allowing the assist lever to rotate toward the closing side.

14. The electric operating device for a switch according to claim 13, characterized in that the cam lever is formed with a notch that avoids interference with the abutment pin when pushed by the assist lever and tilted to one side around the axis of the lever support shaft.

15. 14. The electrically operated switch according to claim 13, wherein the cam lever is biased by the return spring and returns to the upright position when the assist lever passes through in the closing direction during the closing operation.

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