JP2019029222A - Electromagnetic actuator and vacuum circuit breaker - Google Patents

Abstract

An electromagnetic actuator capable of improving assemblability is provided. An electromagnetic actuator according to one embodiment includes a yoke, a first armature, a second armature, a magnet, and a fixed portion. The yoke has a first contact surface and a first suction surface. The first armature includes a second contact surface that faces the first contact surface in a first direction, a first circumferential surface that faces a second direction that intersects the first direction, and Have The second armature has a second suction surface facing the first suction surface in the first direction, and a second peripheral surface facing the first peripheral surface, and the first armature It can move together with the armature. The magnet is capable of attracting the second armature. The fixing portion is located between the first peripheral surface and the second peripheral surface, and the first armature and the second armature relatively move in the first direction. Limit. [Selection] Figure 1

Description

  Embodiments described herein relate generally to an electromagnetic actuator and a vacuum circuit breaker.

  The electromagnetic actuator includes a yoke, an armature movable with respect to the yoke, and a magnet capable of moving and holding the armature. For example, the coil mounted on the electromagnetic actuator increases or decreases the magnetic flux, so that the armature moves relative to the yoke. The electromagnetic actuator mounted on the vacuum circuit breaker opens and closes the vacuum valve by moving the armature.

JP-A-11-252726 JP 2002-270423 A JP 2003-333715 A JP 2004-146336 A JP 2010-225666 A

  The electromagnetic actuator has a plurality of parts, and a dimensional tolerance is specified for each of the plurality of parts. On the other hand, the magnetic circuit of the electromagnetic actuator may include a gap between components. Variations in dimensions within the tolerances of each component are allowed, but variations in the gap caused by the variations in dimensions greatly affect the force generated by the electromagnetic actuator.

  An electromagnetic actuator according to one embodiment includes a yoke, a first armature, a second armature, a magnet, and a fixed portion. The yoke has a first contact surface and a first suction surface. The first armature includes a second contact surface facing the first contact surface in a first direction, a first circumferential surface facing a second direction intersecting the first direction, and And is movable in the first direction inside the yoke. The second armature has a second suction surface facing the first suction surface in the first direction, and a second peripheral surface facing the first peripheral surface, and the second armature A closed position where the first abutment surface comes into contact with the first abutment surface, and the second abutment surface is separated from the first abutment surface, and the second suction surface is located more than the closed position It can move integrally with the first armature at an open position separated from the first suction surface. The magnet is provided in the yoke and can attract the second suction surface of the second armature located at the closed position to the first suction surface. At least a part of the fixing portion is located between the first peripheral surface and the second peripheral surface, and the first armature and the second armature are relatively in the first direction. Restrict moving to.

FIG. 1 is a cross-sectional view schematically showing a vacuum circuit breaker according to the first embodiment. FIG. 2 is a cross-sectional view showing a part of the electromagnetic actuator of the first embodiment. FIG. 3 is a cross-sectional view illustrating a part of the electromagnetic actuator according to the second embodiment. FIG. 4 is a cross-sectional view schematically showing a vacuum circuit breaker according to the third embodiment. FIG. 5 is a cross-sectional view showing a part of the electromagnetic actuator of the third embodiment. FIG. 6 is a cross-sectional view schematically showing a vacuum circuit breaker according to the fourth embodiment. FIG. 7 is a cross-sectional view schematically showing a vacuum circuit breaker according to the fifth embodiment. FIG. 8 is a cross-sectional view showing a part of the electromagnetic actuator of the fifth embodiment.

(First embodiment)
The first embodiment will be described below with reference to FIGS. 1 and 2. In the present specification, a plurality of expressions may be described for the constituent elements according to the embodiment and the description of the elements. The constituent elements and descriptions in which a plurality of expressions are made may be other expressions that are not described. Further, the constituent elements and descriptions that are not expressed in a plurality may be expressed in other ways that are not described.

  FIG. 1 is a cross-sectional view schematically showing a vacuum circuit breaker 10 according to the first embodiment. The vacuum circuit breaker 10 includes an electromagnetic actuator 11, an open spring 12, and a vacuum valve 13. The vacuum valve 13 can also be called a switch. The vacuum circuit breaker 10 may have other devices and other parts.

  The electromagnetic actuator 11 is a substantially columnar device extending along the first central axis Ax1. The electromagnetic actuator 11 may be formed in other shapes. The electromagnetic actuator 11 includes a yoke 21, a magnet 22, an armature 23, a closed coil 24, and an open coil 25.

  Hereinafter, a direction along the first central axis Ax1 is referred to as an axial direction, a direction orthogonal to the first central axis Ax1 is referred to as a radial direction, and a direction rotating around the first central axis Ax1 is referred to as a circumferential direction. The axial direction is an example of a first direction. The radial direction is an example of the second direction. Note that the second direction may be a direction that intersects the axial direction at an angle greater than 0 ° and less than 90 °.

  For convenience of explanation, one of the axial directions indicated by the arrow D in each figure is referred to as the front, and the opposite side of the arrow D is referred to as the rear. The front and rear designations do not limit the arrangement and direction of the vacuum circuit breaker 10 and the electromagnetic actuator 11.

  The yoke 21 and the armature 23 are relatively movable in the axial direction between the open position Po and the closed position Pc. FIG. 1 shows the yoke 21 and the armature 23 at the open position Po on the left side of the first central axis Ax1, and shows the yoke 21 and the armature 23 at the closed position Pc on the right side.

  The yoke 21 includes a first member 31, a second member 32, a third member 33, a fourth member 34, a fifth member 35, and a sixth member 36. The first to sixth members 31 to 36 are made of a magnetic material.

  The first member 31 is formed in a substantially disk shape that extends in the radial direction. The first member 31 is provided with a first insertion hole 31a. The first insertion hole 31 a is a hole that extends in the axial direction and penetrates the first member 31.

  The second member 32 is formed in a substantially cylindrical shape extending in the axial direction. The second member 32 is fixed to the first member 31 so as to extend rearward from the first member 31. The second member 32 has a contact surface 32a. The contact surface 32a is an example of a first contact surface. The contact surface 32a is a substantially flat surface facing rearward in the axial direction. Note that the contact surface 32a is not limited to this example, and may be, for example, a curved surface or uneven.

  The second member 32 is provided with a second insertion hole 32b. The second insertion hole 32b is an example of a first hole. The second insertion hole 32 b is a hole that extends in the axial direction and penetrates the second member 32. The second insertion hole 32b opens to the contact surface 32a and communicates with the first insertion hole 31a.

  The third member 33 is formed in a substantially cylindrical shape extending in the axial direction. The third member 33 is fixed to the first member 31 so as to extend rearward from the first member 31. The third member 33 surrounds the second member 32 with a gap in the radial direction.

  The fourth member 34 is formed in a substantially annular shape extending in the circumferential direction. The fourth member 34 is fixed to the third member 33 so as to protrude radially inward from the rear end of the third member 33. For this reason, the third member 33 is located between the first member 31 and the fourth member 34.

  The fifth member 35 is formed in a substantially cylindrical shape extending in the axial direction. The fifth member 35 is fixed to the fourth member 34 so as to extend rearward from the radially outer end of the fourth member 34. The rear end portion of the fifth member 35 is closed by, for example, a lid.

  The sixth member 36 is formed in a substantially annular shape extending in the circumferential direction. The sixth member 36 is connected to the fourth member 34 via the magnet 22. The sixth member 36 is surrounded by the fifth member 35 with a gap in the radial direction.

  The sixth member 36 has a suction surface 36a. The suction surface 36a is an example of a first suction surface. The suction surface 36a is a substantially flat surface facing rearward in the axial direction. Note that the suction surface 36a is not limited to this example, and may be, for example, a curved surface or uneven.

  The magnet 22 is a permanent magnet, for example. The magnet 22 is formed in a substantially annular shape extending in the circumferential direction. The first central axis Ax <b> 1 is the central axis of the magnet 22. The first central axis Ax1 is not limited to this example.

  The magnet 22 is provided between the fourth member 34 and the sixth member 36 in the axial direction. The magnet 22 is fixed to the fourth member 34 and the sixth member 36 by, for example, an adhesive. Thus, the magnet 22 is provided on the yoke 21.

  The armature 23 is housed inside the yoke 21 and has a first armature 41 and a second armature 42. The first armature 41 includes a rod 45 and a contact member 46.

  The rod 45 is made of a nonmagnetic material and is formed in a substantially cylindrical shape extending in the axial direction. The rod 45 extends along the first central axis Ax1. The rod 45 passes through the first insertion hole 31 a and the second insertion hole 32 b and protrudes outside the yoke 21.

  The contact member 46 is made of a magnetic material and is formed in a substantially cylindrical shape extending in the axial direction. The contact member 46 has a contact surface 46a, an end surface 46b, and a first outer peripheral surface 46c. The contact surface 46a is an example of a second contact surface. The first outer peripheral surface 46c is an example of a first peripheral surface.

  The contact surface 46a is a substantially flat surface facing forward in the axial direction. Note that the contact surface 46a is not limited to this example, and may be, for example, a curved surface or uneven. The contact surface 46a faces the contact surface 32a of the yoke 21 in the axial direction. The rod 45 is fixed to the contact member 46 so as to extend forward from the contact surface 46a.

  The end surface 46b is a surface located on the opposite side of the contact surface 46a and facing backward. The first outer peripheral surface 46c is provided between the edge of the contact surface 46a and the edge of the end surface 46b. The first outer peripheral surface 46c may be provided in the entire region between the edge of the contact surface 46a and the edge of the end surface 46b in the axial direction, or between the edge of the contact surface 46a and the edge of the end surface 46b. It may be provided in a part of.

  The first outer peripheral surface 46c is a substantially cylindrical surface extending in the axial direction and facing radially outward. The outer diameter of the first outer peripheral surface 46c is substantially constant. The first outer peripheral surface 46c may be formed in another shape such as a tapered shape, for example.

  The second armature 42 is made of a magnetic material and is formed in a substantially annular shape extending in the circumferential direction. For this reason, the opening 47 is provided inside the second armature 42. The second armature 42 has a suction surface 42a, an end surface 42b, and a first inner peripheral surface 42c. The suction surface 42a is an example of a second suction surface. The first inner peripheral surface 42c is an example of a second peripheral surface.

  The suction surface 42a is a substantially flat surface facing forward in the axial direction. The suction surface 42a is not limited to this example, and may be, for example, a curved surface or may have irregularities. The suction surface 42a faces the suction surface 36a of the yoke 21 in the axial direction. The end surface 42b is a surface that is located on the opposite side of the suction surface 42a and faces rearward.

  The first inner peripheral surface 42c is provided between the inner peripheral edge of the suction surface 42a and the inner peripheral edge of the end surface 42b. The first inner peripheral surface 42c may be provided in the entire region between the edge of the suction surface 42a and the edge of the end surface 42b in the axial direction, or between the edge of the suction surface 42a and the edge of the end surface 42b. It may be provided in a part. The first inner peripheral surface 42 c defines the opening 47.

  The first inner peripheral surface 42c is a substantially cylindrical surface that extends in the axial direction and faces radially inward. The inner diameter of the first inner peripheral surface 42c is substantially constant. The first inner peripheral surface 42c may be formed in another shape such as a tapered shape, for example.

  A substantially cylindrical contact member 46 is fitted inside the substantially annular second armature 42. In other words, the contact member 46 is fitted into the opening 47 provided in the second armature 42. For this reason, the first inner peripheral surface 42 c faces the first outer peripheral surface 46 c of the contact member 46. The inner diameter of the first inner peripheral surface 42c is slightly larger than the outer diameter of the first outer peripheral surface 46c, for example.

  FIG. 2 is a cross-sectional view showing a part of the electromagnetic actuator 11 of the first embodiment. As shown in FIG. 2, the electromagnetic actuator 11 has a plurality of wedges 48. The wedge 48 is an example of a fixed part.

  The plurality of wedges 48 are inserted between the first outer peripheral surface 46 c of the first armature 41 and the first inner peripheral surface 42 c of the second armature 42 from the front and the rear. For this reason, at least a part of the wedge 48 is interposed between the first outer peripheral surface 46c and the first inner peripheral surface 42c.

  The wedge 48 is inserted from the front and the rear, thereby pushing the first outer peripheral surface 46c and the first inner peripheral surface 42c in a substantially radial direction. For this reason, the wedge 48 has the first armature 41 and the second armature 42 at least in the axial direction by the frictional force generated between the wedge 48 and the first outer peripheral surface 46c and the first inner peripheral surface 42c. Restrict movement relative to

  The first armature 41 is fixed to the second armature 42 by the wedge 48. Accordingly, the first armature 41 and the second armature 42 can move integrally in the axial direction inside the yoke 21.

  As shown in FIG. 1, the contact surface 46 a of the first armature 41 contacts the contact surface 32 a of the yoke 21 at the closed position Pc. Further, at the closed position Pc, the suction surface 42a of the second armature 42 is slightly separated from the suction surface 36a of the yoke 21 in the axial direction. That is, the gap G is provided between the suction surface 42a and the suction surface 36a at the closed position Pc. The gap G is included in the magnetic circuit provided in the yoke 21 and the armature 23 at the closed position Pc.

  By providing the gap G, when the armature 23 moves from the open position Po to the closed position Pc, it is possible to suppress a load from acting on the magnet 22. Note that the gap G may not be provided, and the suction surface 42a may contact the suction surface 36a.

  In the open position Po, the contact surface 46a of the first armature 41 is separated from the contact surface 32a of the yoke 21 in the axial direction. Further, at the open circuit position Po, the suction surface 42 a of the second armature 42 is separated from the suction surface 36 a of the yoke 21 in the axial direction.

  In the axial direction, the distance L1 between the suction surface 42a at the open circuit position Po and the suction surface 36a is longer than the length L2 of the gap G between the suction surface 42a and the suction surface 36a at the closed circuit position Pc. That is, the open circuit position Po is a relative position between the yoke 21 and the armature 23 where the suction surface 42a is further away from the suction surface 36a than the closed circuit position Pc.

  The magnet 22 is fixed to the sixth member 36 of the yoke 21 which is a magnetic body and has a suction surface 36a. For this reason, the magnet 22 attracts the attracting surface 42 a of the second armature 42 to the attracting surface 36 a of the yoke 21. The magnet 22 can hold the armature 23 at the closed position Pc by attracting the suction surface 42a of the second armature 42 located at the closed position Pc to the suction surface 36a.

  The closed coil 24 and the open coil 25 are formed in a substantially cylindrical shape extending in the axial direction. For example, the closed coil 24 and the open coil 25 are arranged in the axial direction and are accommodated in the yoke 21. The closed coil 24 and the open coil 25 are located between the first member 31 and the fourth member 34 in the axial direction, and are located between the second member 32 and the third member 33 in the radial direction. To do. When the closed coil 24 and the open coil 25 are excited, for example, the magnetic flux generated in the electromagnetic actuator 11 by the magnet 22 is increased or decreased.

  The open spring 12 is connected to the rod 45 outside the electromagnetic actuator 11. The open spring 12 may be indirectly connected to the rod 45. The open spring 12 applies an elastic force to the rod 45.

  The open spring 12 pushes the rod 45 backward, for example. The force with which the open spring 12 pushes the rod 45 is greater than the force with which the magnet 22 attracts the suction surface 42a of the second armature 42 located at the open position Po to the suction surface 36a of the yoke 21. For this reason, the open spring 12 can hold the armature 23 at the open position Po.

  Further, the open spring 12 assists the armature 23 to quickly move from the closed position Pc to the open position Po. The open spring 12 may not be provided, and the armature 23 may be moved to the open position Po by magnetic flux.

  The vacuum valve 13 includes a fixed electrode 51, a movable electrode 52, and a vacuum container 53. The fixed electrode 51 is an example of a first electrode. The movable electrode 52 is an example of a second electrode. FIG. 1 schematically shows the vacuum vessel 53 with a two-dot chain line.

  The fixed electrode 51 and the movable electrode 52 are accommodated in an airtightly sealed vacuum vessel 53. The fixed electrode 51 is fixed to the vacuum container 53. The movable electrode 52 can approach or move away from the fixed electrode 51 along the second central axis Ax2.

  The movable electrode 52 is connected to the rod 45 of the first armature 41 through a mechanism, for example, and moves relative to the fixed electrode 51 in conjunction with the armature 23. That is, the electromagnetic actuator 11 operates the movable electrode 52 by the rod 45.

  The movable electrode 52 contacts the fixed electrode 51 when the armature 23 is at the closed position Pc, and is separated from the fixed electrode 51 when the armature 23 is at the open position Po. For this reason, the vacuum valve 13 is in a closed state Sc that can be energized when the armature 23 is in the closed position Pc, and is in an open state So that interrupts the current when the armature 23 is in the open position Po.

  In the vacuum circuit breaker 10 described above, when the vacuum valve 13 is in the closed circuit state Sc, the closed coil 24 is excited. Thereby, the magnetic flux of the closed coil 24 is added to the magnetic flux of the magnet 22, and the force that attracts the suction surface 42 a of the second armature 42 to the suction surface 36 a of the yoke 21 is greater than the force that the open spring 12 pushes the rod 45. growing.

  The suction surface 36a of the yoke 21 suctions the suction surface 42a of the second armature 42, so that the armature 23 moves relative to the yoke 21 from the open position Po to the closed position Pc. Even when the excitation of the closed coil 24 is released, the magnet 22 holds the armature 23 at the closed position Pc.

  On the other hand, when the vacuum valve 13 is in the open circuit state So, the open coil 25 is excited. As a result, the magnetic flux of the magnet 22 is offset by the magnetic flux of the open coil 25, and the force that attracts the suction surface 42a of the second armature 42 to the suction surface 36a of the yoke 21 is greater than the force by which the open spring 12 pushes the rod 45. Get smaller.

  When the open spring 12 pushes the rod 45, the armature 23 moves relative to the yoke 21 from the closed position Pc to the open position Po. Even when the excitation of the open coil 25 is released, the open spring 12 holds the armature 23 at the open position Po.

  The force for attracting the attracting surface 42a of the second armature 42 where the magnet 22 is located at the closed position Pc to the attracting surface 36a is greatly influenced by the length L2 of the gap G in the axial direction. For example, the length L2 of the gap G is adjusted as follows when the electromagnetic actuator 11 is assembled. In addition, the adjustment method of the length L2 of the space | gap G is not restricted to the following examples.

  First, the yoke 21, the magnet 22, the closed coil 24, and the open coil 25 are assembled. Next, the first armature 41 is disposed inside the yoke 21 so that the rod 45 passes through the first insertion hole 31a and the second insertion hole 32b. The contact surface 46 a of the first armature 41 is brought into contact with the contact surface 32 a of the yoke 21.

  Next, the substantially annular second armature 42 is fitted to the first outer peripheral surface 46 c of the contact member 46. At this time, since there is no wedge 48, the second armature 42 can move in the axial direction with respect to the first armature 41.

  The second armature 42 is disposed at a position where the gap G between the suction surface 42a and the suction surface 36a is a predetermined length L2 with respect to the first armature 41 in the axial direction. In this state, the first armature 41 and the second armature 42 are relatively moved to the first outer peripheral surface 46c of the contact member 46 or the first inner peripheral surface 42c of the second armature 42 by, for example, a marking needle. Record the correct position.

  Next, the first armature 41 and the second armature 42 are arranged outside the yoke 21 based on the above recording. In this state, a plurality of wedges 48 are inserted between the first outer peripheral surface 46c and the first inner peripheral surface 42c. This restricts the relative movement of the first armature 41 and the second armature 42.

  Next, the armature 23 is arranged inside the yoke 21 in a state where the first armature 41 and the second armature 42 are fixed to each other by the wedge 48. Thus, the length L2 of the gap G is set to a desired length without being affected by variations in dimensions of various components of the electromagnetic actuator 11.

  In the vacuum circuit breaker 10 according to the first embodiment described above, the first inner peripheral surface 42c of the second armature 42 faces the first outer peripheral surface 46c of the first armature 41 that faces in the radial direction. . The wedge 48 is located between the first outer peripheral surface 46c and the first inner peripheral surface 42c, and restricts relative movement of the first armature 41 and the second armature 42 at least in the axial direction. To do. That is, the first outer peripheral surface 46c and the first inner peripheral surface 42c are movable in the axial direction by being directed in the radial direction, but the relative movement in the axial direction is limited by the wedge 48. ing. According to this configuration, at the time of assembling the electromagnetic actuator 11, the position (attachment position) that restricts the relative movement between the first armature 41 and the second armature 42 by the wedge 48 is adjusted, and the suction at the closed position Pc is performed. The length L2 of the gap G between the surface 42a and the suction surface 36a can be easily adjusted.

  As an example, let us consider a case where a disk-shaped second armature 42 is joined to the end face 46b of the contact member 46 from the axial direction. In this case, the first armature 41 and the second armature 42 are separated in the axial direction, and the position of the second armature 42 with respect to the first armature 41 in the axial direction can be determined with a tool such as a marking needle. It is difficult to record. Therefore, for example, the electromagnetic actuator 11 is assembled once, the length L2 of the gap G is measured, and the length L2 of the gap G is adjusted by disassembling and reassembling the electromagnetic actuator 11 based on the measurement result. It may be possible to do.

  However, in the electromagnetic actuator 11 of the present embodiment, the first outer peripheral surface 46c and the first inner peripheral surface 42c face each other in the radial direction. Therefore, the position of the second armature 42 with respect to the first armature 41 in the axial direction can be recorded on the first outer peripheral surface 46c or the first inner peripheral surface 42c by, for example, a marking needle. Therefore, it is possible to easily adjust the length L2 of the gap G without accompanying back-turning such as disassembly and reassembly of the electromagnetic actuator 11. As described above, even if the dimensions of individual parts vary, the length L2 of the gap G can be easily adjusted by adjusting the position of the second armature 42 with respect to the first armature 41 when the electromagnetic actuator 11 is assembled. Can be adjusted. Thereby, the assemblability of the electromagnetic actuator 11 is improved.

  At least a portion of the wedge 48 interposed between the first outer peripheral surface 46c and the first inner peripheral surface 42c causes the first armature 41 and the second armature 42 to move relatively at least in the axial direction. Limit that. Thereby, the attachment position of the 1st armature 41 and the 2nd armature 42 can be adjusted easily only by inserting the wedge 48 between the 1st outer peripheral surface 46c and the 1st inner peripheral surface 42c.

(Second Embodiment)
The second embodiment will be described below with reference to FIG. In the following description of the plurality of embodiments, components having the same functions as the components already described are denoted by the same reference numerals as those described above, and further description may be omitted. . In addition, a plurality of components to which the same reference numerals are attached do not necessarily have the same functions and properties, and may have different functions and properties according to each embodiment.

  FIG. 3 is a cross-sectional view showing a part of the electromagnetic actuator 11 according to the second embodiment. As shown in FIG. 3, in the second embodiment, an adhesive 61 is provided instead of the wedge 48 between the first outer peripheral surface 46c and the first inner peripheral surface 42c. The adhesive 61 is an example of a fixing part. Both the wedge 48 and the adhesive 61 may be provided between the first outer peripheral surface 46c and the first inner peripheral surface 42c.

  The adhesive 61 is provided between the first outer peripheral surface 46c of the first armature 41 and the first inner peripheral surface 42c of the second armature 42, and the first outer peripheral surface 46c and the first inner peripheral surface 42c. The peripheral surface 42c is bonded to each other. The adhesive 61 may not be completely filled between the first outer peripheral surface 46c and the first inner peripheral surface 42c, and at least a part of the first outer peripheral surface 46c and the first inner peripheral surface is provided. 42 c.

  In the vacuum circuit breaker 10 of the second embodiment described above, the adhesive 61 restricts the first armature 41 and the second armature 42 from moving relatively at least in the axial direction. Thereby, the attachment position of the 1st armature 41 and the 2nd armature 42 can be easily adjusted only by supplying the adhesive agent 61. FIG.

(Third embodiment)
Hereinafter, the third embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a cross-sectional view schematically showing the vacuum circuit breaker 10 according to the third embodiment. FIG. 5 is a cross-sectional view showing a part of the electromagnetic actuator 11 of the third embodiment.

  As shown in FIG. 4, in the third embodiment, the armature 23 is provided with a screw portion 65. The screw part 65 is an example of a fixing part. The screw portion 65 has a male screw portion 65a and a first female screw portion 65b. The male screw portion 65a is an example of a first screw portion. The first female screw portion 65b is an example of a second screw portion.

  The male screw portion 65a is provided on the first outer peripheral surface 46c of the contact member 46 and extends in the axial direction. For example, the male screw portion 65a is provided in the recessed portion 46ca of the first outer peripheral surface 46c. The recessed portion 46ca is a portion having a smaller outer diameter than the other portion 46cb of the first outer peripheral surface 46c. The outer diameter of the thread of the male thread portion 65a is substantially equal to the outer diameter of the other portion 46cb. The male screw portion 65a may be provided so that the screw thread protrudes from the first outer peripheral surface 46c having a uniform outer diameter.

  The first female screw portion 65b is provided on the first inner peripheral surface 42c of the second armature 42 and extends in the axial direction. The first female screw portion 65b is fitted into the male screw portion 65a. This restricts relative movement of the first armature 41 and the second armature 42 in the axial direction when there is no relative rotation between the male screw portion 65a and the first female screw portion 65b. The That is, the male screw portion 65a and the first female screw portion 65b positioned between the first outer peripheral surface 46c and the first inner peripheral surface 42c are formed by the first armature 41 and the second armature 42. Restricts relative movement in the axial direction.

  As shown in FIG. 5, a groove 67 is provided in a recessed portion 46ca of the first outer peripheral surface 46c. For example, the groove 67 extends in the axial direction from the end face 46 b of the contact member 46. The groove 67 divides the male screw portion 65a in the circumferential direction.

  An adhesive 61 is provided in the groove 67. The adhesive 61 is also an example of a fixing part. The adhesive 61 is interposed between the first outer peripheral surface 46c that defines the groove 67, the first inner peripheral surface 42c, and the first female screw portion 65b.

  The adhesive 61 bonds the first outer peripheral surface 46c defining the groove 67, the first inner peripheral surface 42c, and the first female screw portion 65b to each other. As a result, the adhesive 61 restricts relative rotation between the male screw portion 65a and the first female screw portion 65b, and the first armature 41 and the second armature 42 move relatively in the axial direction. Limit what you do.

  In the vacuum circuit breaker 10 of the third embodiment described above, the first outer peripheral surface 46c of the first armature 41 is provided with the male screw portion 65a extending in the axial direction. A first female thread portion 65 b extending in the axial direction is provided on the first inner peripheral surface 42 c of the second armature 42. Since the first female screw portion 65b is fitted into the male screw portion 65a, the movement of the first armature 41 and the second armature 42 in the axial direction is restricted when no external force is applied. . According to the said structure, the attachment position of the 1st armature 41 and the 2nd armature 42 can be easily adjusted by rotating the fitted male screw part 65a and the 1st female screw part 65b relatively. In addition, it is possible to easily limit the relative movement of the first armature 41 and the second armature 42 in the axial direction. Therefore, even if the dimensions of individual components vary, the length L2 of the gap G can be easily adjusted when the electromagnetic actuator 11 is assembled.

  The adhesive 61 is interposed between the first armature 41 and the second armature 42 and restricts the relative movement of the first armature 41 and the second armature 42 at least in the axial direction. Thereby, the length L2 of the gap G is changed by the relative rotation of the fitted male screw portion 65a and the first female screw portion 65b by an external force such as inertia force or electromagnetic force, Is suppressed.

(Fourth embodiment)
Hereinafter, the fourth embodiment will be described with reference to FIG. FIG. 6 is a cross-sectional view schematically showing a vacuum circuit breaker 10 according to the fourth embodiment. As shown in FIG. 6, in the fourth embodiment, the first armature 41 further includes a nut 71 and an adhesive 72. The adhesive 72 is an example of a fixing part.

  In the fourth embodiment, the rod 45 has a first portion 45a, a second portion 45b, and a third portion 45c. The first portion 45 a is passed through the first insertion hole 31 a and the second insertion hole 32 b of the yoke 21. The second portion 45b extends from the end of the first portion 45a and has an outer diameter smaller than that of the first portion 45a. The third portion 45c extends from the end of the second portion 45b and has an outer diameter smaller than that of the second portion 45b.

  In the fourth embodiment, a male screw portion 65 a of the screw portion 65 is provided in the third portion 45 c of the rod 45. The outer diameter of the third portion 45 c is smaller than the outer diameter of the first outer peripheral surface 46 c of the contact member 46.

  The contact member 46 is formed in a substantially cylindrical shape extending in the axial direction, and is provided with an insertion hole 46d. The insertion hole 46d is an example of a second hole. The inner diameter of the insertion hole 46d is smaller than the outer diameter of the first portion 45a of the rod 45 and larger than the outer diameter of the second portion 45b.

  The second portion 45b of the rod 45 is passed through the insertion hole 46d. Accordingly, the end portion of the first portion 45 a of the rod 45 supports the contact surface 46 a of the contact member 46. In the axial direction, the length of the second portion 45 b is the same as or shorter than the length of the contact member 46. For this reason, the third portion 45 c of the rod 45 protrudes from the end surface 46 b of the contact member 46.

  The nut 71 is made of a magnetic material and is formed in a substantially annular shape extending in the circumferential direction. The nut 71 has a second female screw portion 65c. The second female screw portion 65c is an example of a third screw portion.

  The second female screw portion 65 c fits with the male screw portion 65 a provided in the third portion 45 c of the rod 45. This restricts the relative movement of the nut 71 and the rod 45 in the axial direction.

  The nut 71 supports the end surface 46 b of the contact member 46. As a result, the contact member 46 is sandwiched between the first portion 45 a of the rod 45 and the nut 71. That is, the nut 71 fixes the contact member 46 to the rod 45.

  The nut 71 has a second outer peripheral surface 71a. The second outer peripheral surface 71a is an example of a third peripheral surface. The second outer peripheral surface 71a is a substantially cylindrical surface extending in the axial direction and facing outward in the radial direction. The outer diameter of the second outer peripheral surface 71a is substantially constant and is substantially equal to the outer diameter of the first outer peripheral surface 46c of the contact member 46. The second outer peripheral surface 71a may be formed in another shape such as a tapered shape.

  In the second armature 42, the inner diameters of the first inner peripheral surface 42 c and the opening 47 are set to be substantially the same as the outer diameter of the male screw portion 65 a provided in the third portion 45 c of the rod 45. For this reason, each inner diameter of the first inner peripheral surface 42 c and the opening 47 is smaller than the outer diameter of the first outer peripheral surface 46 c of the contact member 46.

  A recess 75 is provided in the second armature 42. The recess 75 is a bottomed hole that opens to the suction surface 42a. The recess 75 communicates with the opening 47. That is, the opening 47 opens to the bottom of the recess 75.

  The second armature 42 has a second inner peripheral surface 42 d that defines the recess 75. The second inner peripheral surface 42d is an example of a fourth peripheral surface. The second inner peripheral surface 42d is a substantially cylindrical surface extending in the axial direction and facing radially inward. The inner diameter of the second inner peripheral surface 42d is larger than the inner diameter of the first inner peripheral surface 42c and is substantially constant. The second inner peripheral surface 42d may be formed in another shape such as a taper shape, for example.

  The first female screw portion 65 b of the second armature 42 is fitted into the male screw portion 65 a of the third portion 45 c of the rod 45. Thereby, the 2nd armature 42 is attached to the rod 45 of the 1st armature 41, and it is restricted that the 1st armature 41 and the 2nd armature 42 move relatively in the direction of an axis.

  When the second armature 42 is attached to the rod 45, the nut 71 is fitted in the recess 75 of the second armature 42. For this reason, the second inner peripheral surface 42 d of the second armature 42 faces the second outer peripheral surface 71 a of the nut 71. For example, the inner diameter of the second inner peripheral surface 42d is slightly larger than the outer diameter of the second outer peripheral surface 71a.

  The adhesive 72 is provided in the recess 75 and is interposed between the second armature 42 and the nut 71 of the first armature 41. The adhesive 72 bonds the first armature 41 and the second armature 42 to each other, and restricts the relative movement of the first armature 41 and the second armature 42 at least in the axial direction.

  In the electromagnetic actuator 11 of the fourth embodiment described above, the contact member 46 of the first armature 41 has a contact surface 46a and is provided with an insertion hole 46d. A male thread portion 65a is provided on the rod 45 passing through the insertion hole 46d. That is, the male screw portion 65 a is provided on the rod 45 that passes through the inside of the contact member 46. For this reason, the outer diameter of the male screw portion 65a can be made smaller, and the male screw portion 65a and the first female screw portion 65b can be formed more easily.

  The second outer peripheral surface 71a of the nut 71 faces in the radial direction. The second armature 42 has a second inner peripheral surface 42d facing the second outer peripheral surface 71a. For this reason, the armature 23 is connected to the magnetic path from the first inner peripheral surface 42c of the second armature 42 to the rod 45, and from the second inner peripheral surface 42d of the second armature 42 to the rod through the nut 71. And a magnetic path to 45 occurs. Furthermore, the distance between the second outer peripheral surface 71a and the second inner peripheral surface 42d does not depend on the relative positions of the first armature 41 and the second armature 42 in the axial direction, and is substantially constant. It is. For this reason, a stable magnetic path can be provided between the second outer peripheral surface 71a and the second inner peripheral surface 42d. As described above, the force generated by the electromagnetic actuator 11 can be stabilized.

  The adhesive 72 is interposed between the first armature 41 and the second armature 42, and restricts the relative movement of the first armature 41 and the second armature 42 at least in the axial direction. Thereby, the length L2 of the gap G is changed by the relative rotation of the fitted male screw portion 65a and the first female screw portion 65b by an external force such as inertia force or electromagnetic force, Is suppressed.

(Fifth embodiment)
The fifth embodiment will be described below with reference to FIGS. FIG. 7 is a cross-sectional view schematically showing a vacuum circuit breaker 10 according to the fifth embodiment. FIG. 8 is a cross-sectional view showing a part of the electromagnetic actuator 11 of the fifth embodiment.

  As shown in FIG. 7, the yoke 21 of the fifth embodiment has a first yoke 81 and a second yoke 82. The first yoke 81 includes a first member 31, a third member 33, a fourth member 34, a fifth member 35, and a sixth member 36. The second yoke 82 includes the second member 32.

  The sixth member 36 of the first yoke 81 has a suction surface 36a as in the first embodiment. The suction surface 36a is an example of a fourth suction surface. The suction surface 36a faces the suction surface 42a of the second armature 42, which is an example of a third suction surface, in the axial direction. The magnet 22 is provided in the first yoke 81 and can attract the suction surface 42a of the second armature 42 located at the closed position Pc to the suction surface 36a.

  An opening 85 is provided in the first member 31 of the first yoke 81 instead of the first insertion hole 31a. The first member 31 has an inner peripheral surface 31 b that defines the opening 85. The inner peripheral surface 31b is an example of a fifth peripheral surface. The inner peripheral surface 31b is a substantially cylindrical surface that extends in the axial direction and faces radially inward. The inner diameter of the inner peripheral surface 31b is substantially constant. The inner peripheral surface 31b may be formed in another shape such as a tapered shape, for example.

  The second member 32 of the second yoke 82 has a contact surface 32a and an outer peripheral surface 32c. The contact surface 32a is an example of a fourth contact surface. The outer peripheral surface 32c is an example of a sixth peripheral surface. The contact surface 32a faces the contact surface 46a of the contact member 46, which is an example of a third contact surface, in the axial direction. The outer peripheral surface 32c is a substantially cylindrical surface that extends in the axial direction and faces radially outward.

  The second member 32 is fitted into the opening 85 provided in the first member 31. For this reason, the outer peripheral surface 32 c of the second member 32 faces the inner peripheral surface 31 b of the first member 31. The inner diameter of the inner peripheral surface 31b is slightly larger than the outer diameter of the outer peripheral surface 32c, for example.

  As shown in FIG. 8, a screw portion 91 is provided on the yoke 21. The screw part 91 is an example of a fixing part. The screw portion 91 includes a female screw portion 91 a included in the first yoke 81 and a male screw portion 91 b included in the second yoke 82. The female screw portion 91a is an example of a fourth screw portion. The male screw portion 91b is an example of a fifth screw portion.

  The female screw portion 91a is provided on the inner peripheral surface 31b of the first member 31 and extends in the axial direction. The male screw portion 91b is provided on the outer peripheral surface 32c of the second member 32 and extends in the axial direction. For example, the male screw portion 91b is provided in the recessed portion 32ca of the outer peripheral surface 32c. The recessed portion 32ca is a portion having an outer diameter smaller than that of the other portion 32cb of the outer peripheral surface 32c. The outer diameter of the thread of the male thread portion 91b is substantially equal to the outer diameter of the other portion 32cb. The male screw portion 91b may be provided so that the screw thread protrudes from the outer peripheral surface 32c having a uniform outer diameter.

  The female screw portion 91a is fitted into the male screw portion 91b. Thus, when there is no relative rotation between the female screw portion 91a and the male screw portion 91b, the first yoke 81 and the second yoke 82 are restricted from relatively moving in the axial direction. In other words, the female screw portion 91a and the male screw portion 91b located between the outer peripheral surface 32c and the inner peripheral surface 31b move the first yoke 81 and the second yoke 82 relatively in the axial direction. Limit.

  A groove 92 is provided in the recessed portion 32ca of the outer peripheral surface 32c. The groove 92 extends, for example, in the axial direction. The groove 92 divides the male screw portion 91b in the circumferential direction. An adhesive 93 is provided in the groove 92. The adhesive 93 is also an example of a fixing part. The adhesive 93 is interposed between the outer peripheral surface 32c that defines the groove 92, the inner peripheral surface 31b, and the female screw portion 91a.

  The adhesive 93 bonds the outer peripheral surface 32c that defines the groove 92, the inner peripheral surface 31b, and the female screw portion 91a to each other. Thereby, the adhesive 93 restricts the relative rotation of the male screw portion 91b and the female screw portion 91a, and the first yoke 81 and the second yoke 82 are relatively moved in the axial direction. Restrict.

  The second yoke 82 is fixed to the first yoke 81 by the screw portion 91 and the adhesive 93. As a result, the yoke 21 can move integrally in the axial direction relative to the armature 23 accommodated in the first yoke 81. The yoke 21 and the armature 23 are relatively movable to the open position Po and the closed position Pc, as in the first embodiment.

  The length L2 of the gap G between the suction surface 42a of the armature 23 located at the closed position Pc and the suction surface 36a of the first yoke 81 is adjusted, for example, as follows when the electromagnetic actuator 11 is assembled. In addition, the adjustment method of the length L2 of the space | gap G is not restricted to the following examples.

  First, the yoke 21 and the armature 23 are assembled. At this time, the adhesive 93 is not yet provided, and the first and second yokes 81 and 82 are relatively moved in the axial direction by the relative rotation of the female screw portion 91a and the male screw portion 91b. It is movable.

  Next, the armature 23 is disposed inside the yoke 21 so that the rod 45 passes through the second insertion hole 32b. The contact surface 46 a of the armature 23 is brought into contact with the contact surface 32 a of the second yoke 82.

  Next, by rotating the female screw portion 91a and the male screw portion 91b relatively, the gap G between the suction surface 42a and the suction surface 36a is changed between the first yoke 81 and the second yoke 82. It arrange | positions in the position used as the predetermined length L2. If the first yoke 81 and the second yoke 82 are relatively stationary in the circumferential direction, the movement of the first yoke 81 and the second yoke 82 in the axial direction is limited. .

  Next, an adhesive 93 is supplied to the groove 92. By solidifying the adhesive 93, the relative movement of the first armature 41 and the second armature 42 is restricted. The adhesive 93 may be solidified by once removing the armature 23 from the inside of the yoke 21. As described above, the length L2 of the gap G is set to a desired length without being affected by variations in dimensions of various components of the electromagnetic actuator 11.

  As in the fifth embodiment described above, the length L2 of the gap G may be adjustable by providing the yoke 21 with the screw portion 91 and the adhesive 93. Furthermore, as shown in FIG. 7, the armature 23 may have a structure capable of adjusting the length L2 of the gap G, as in the first to fourth embodiments.

  The adhesives 61, 72, 93 provided in the second to fifth embodiments described above may have magnetism, for example, by mixing magnetic powder. In this case, the magnetic circuit of the electromagnetic actuator 11 can pass through the adhesives 61, 72, and 93.

  As shown in the above first to fifth embodiments, the first armature 41 and the second armature 42 are provided as separate parts that are relatively movable in the axial direction, so that the length of the gap G is increased. The length L2 can be adjusted. In each embodiment, the wedge 48, the adhesives 61, 72, 93, and the screw portions 65, 91 are examples of the fixing portion. However, a portion where the first armature 41 and the second armature 42 are welded is shown. It may be an example of a fixed part. In this case, the first armature 41 and the second armature 42 are partially integrated parts. However, for example, the first armature 41 and the second armature 42 are separated from each other by having the first outer peripheral surface 46c and the first inner peripheral surface 42c in which the first armature 41 and the second armature 42 face each other. It becomes clear that it is a part. The same applies to the case where the first yoke 81 and the second yoke 82 are welded.

  According to at least one embodiment described above, the yoke or armature is provided with a structure capable of adjusting dimensions. As a result, even if the dimensions of individual parts vary, the distance between the second suction surface and the first suction surface at the closed position can be easily adjusted when the electromagnetic actuator is assembled. For example, the so-called back turn of disassembling and reassembling the once assembled electromagnetic actuator is suppressed, and the assembling property of the electromagnetic actuator is improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Vacuum circuit breaker, 11 ... Electromagnetic actuator, 21 ... Yoke, 22 ... Magnet, 23 ... Armature, 31b ... Inner peripheral surface, 32a ... Contact surface, 32c ... Outer peripheral surface, 36a ... Suction surface, 41 ... First Armature, 42 ... second armature, 42a ... suction surface, 42c ... first inner peripheral surface, 42d ... second inner peripheral surface, 45 ... rod, 46 ... contact member, 46a ... contact surface, 46c ... 1st outer peripheral surface, 46d ... insertion hole, 48 ... wedge, 51 ... fixed electrode, 52 ... movable electrode, 61 ... adhesive agent, 65 ... screw part, 65a ... male screw part, 65b ... first female screw part, 71 ... Nut, 71a ... Second outer peripheral surface, 72 ... Adhesive, 81 ... First yoke, 82 ... Second yoke, 91 ... Screw part, 91a ... Female thread part, 91b ... Male thread part, 93 ... Adhesive, Po: open circuit position, Pc: closed circuit position.

Claims (12)

A yoke having a first abutment surface and a first suction surface;
A second contact surface facing the first contact surface in the first direction, and a first peripheral surface facing the second direction intersecting the first direction, A first armature that is movable in the first direction inside;
A second suction surface facing the first suction surface in the first direction; and a second peripheral surface facing the first peripheral surface, wherein the second contact surface is the first contact surface. A closed position that contacts the first contact surface, and the second contact surface is separated from the first contact surface, and the second suction surface is further away from the first suction surface than the closed position. A second armature that is movable integrally with the first armature at a spaced open position;
A magnet provided in the yoke and capable of attracting the second suction surface of the second armature located at the closed position to the first suction surface;
At least a portion is located between the first peripheral surface and the second peripheral surface, and the first armature and the second armature move relatively in the first direction. A fixed part to be restricted,
An electromagnetic actuator comprising:   The electromagnetic actuator according to claim 1, wherein the fixing portion includes an adhesive.   The electromagnetic actuator according to claim 1, wherein at least a part of the fixing portion includes a wedge interposed between the first peripheral surface and the second peripheral surface. The fixing portion is provided on a first screw portion provided on the first peripheral surface and on the second peripheral surface, and the first armature and the second armature are in the first direction. A second screw portion fitted to the first screw portion so as to restrict relative movement to the first screw portion,
The electromagnetic actuator according to claim 1. A yoke having a first abutment surface and a first suction surface;
A second abutting surface facing the first abutting surface in the first direction; and a first threaded portion extending in the first direction, wherein the first direction is within the yoke. A first armature movable to the
A second suction surface facing the first suction surface in the first direction, and a second screw portion extending in the first direction and fitted to the first screw portion, The closed position where the second contact surface comes into contact with the first contact surface, and the second contact surface is separated from the first contact surface and the second position than the closed position. A second armature capable of moving integrally with the first armature at an open position where the suction surface is spaced from the first suction surface;
A magnet provided in the yoke and capable of attracting the second suction surface of the second armature located at the closed position to the first suction surface;
An electromagnetic actuator comprising: The yoke is provided with a first hole that opens in the first contact surface;
The first armature is provided with a rod that is passed through the first hole and provided with the first screw portion, and a second hole that has the second contact surface and through which the rod passes. An abutting member, and a third screw portion fitted to the first screw portion and a nut for fixing the abutting member to the rod,
The electromagnetic actuator according to claim 5. The nut has a third peripheral surface facing a second direction intersecting the first direction;
The second armature has a fourth peripheral surface facing the third peripheral surface;
The electromagnetic actuator according to claim 6.   A fixing portion that is interposed between the first armature and the second armature and restricts relative movement of the first armature and the second armature in the first direction; The electromagnetic actuator according to claim 5, further comprising: An armature having a third abutment surface and a third suction surface;
A fourth suction surface facing the third suction surface in a first direction; and a fifth peripheral surface facing a second direction intersecting the first direction; and housing the armature. And a first yoke movable in the first direction relative to the armature;
A fourth contact surface facing the third contact surface in the first direction; and a sixth peripheral surface facing the fifth peripheral surface, wherein the fourth contact surface is The closed position that contacts the third contact surface, the fourth contact surface is separated from the third contact surface, and the fourth suction surface is more than the third suction surface than the closed position. A second yoke movable relative to the armature integrally with the first yoke at an open position spaced from the surface;
A magnet provided on the first yoke and capable of attracting the third suction surface of the armature to the fourth suction surface of the first yoke located at the closed position;
At least a portion is located between the fifth peripheral surface and the sixth peripheral surface, and the first yoke and the second yoke move relatively in the first direction. A fixed part to be restricted,
An electromagnetic actuator comprising: An armature having a third abutment surface and a third suction surface;
A fourth suction surface facing the third suction surface in the first direction; and a fourth screw portion extending in the first direction; and housing the armature and relative to the armature A first yoke movable in the first direction;
A fourth abutting surface facing the third abutting surface in the first direction; and a fifth threaded portion extending in the first direction and fitted to the fourth threaded portion. The closed position where the fourth contact surface contacts the third contact surface, and the fourth contact surface is separated from the third contact surface and is more than the closed position. A second yoke that is movable with respect to the armature integrally with the first yoke at an open circuit position where the suction surface of 4 is spaced apart from the third suction surface;
A magnet provided on the first yoke and capable of attracting the third suction surface of the armature to the fourth suction surface of the first yoke located at the closed position;
An electromagnetic actuator comprising: An electromagnetic actuator according to any one of claims 1 to 8,
A first electrode;
Connected to the first armature, contacting the first electrode when the second armature is in the closed position, and from the first electrode when the second armature is in the open position A second electrode that is spaced apart;
A vacuum circuit breaker comprising: An electromagnetic actuator according to claim 9 or 10;
A first electrode;
A first electrode connected to the armature and in contact with the first electrode when the second yoke is in the closed position and spaced apart from the first electrode when the second yoke is in the open position. Two electrodes;
A vacuum circuit breaker comprising:

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