EP3128523B1 - Release-type electromagnet device and production method therefor - Google Patents
Release-type electromagnet device and production method therefor Download PDFInfo
- Publication number
- EP3128523B1 EP3128523B1 EP14888541.1A EP14888541A EP3128523B1 EP 3128523 B1 EP3128523 B1 EP 3128523B1 EP 14888541 A EP14888541 A EP 14888541A EP 3128523 B1 EP3128523 B1 EP 3128523B1
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- EP
- European Patent Office
- Prior art keywords
- yoke
- bobbin
- plunger
- permanent magnet
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000003780 insertion Methods 0.000 claims description 122
- 230000037431 insertion Effects 0.000 claims description 122
- 238000012546 transfer Methods 0.000 claims description 71
- 230000002093 peripheral effect Effects 0.000 claims description 17
- 230000000717 retained effect Effects 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 3
- 230000004907 flux Effects 0.000 description 7
- 238000011161 development Methods 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/16—Rectilinearly-movable armatures
- H01F7/1607—Armatures entering the winding
- H01F7/1615—Armatures or stationary parts of magnetic circuit having permanent magnet
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/081—Magnetic constructions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/32—Electromagnetic mechanisms having permanently magnetised part
- H01H71/321—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements
- H01H71/322—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements with plunger type armature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/081—Magnetic constructions
- H01F2007/083—External yoke surrounding the coil bobbin, e.g. made of bent magnetic sheet
Definitions
- the present invention relates to a release type electromagnetic device and a method of manufacturing the same, the device being used as a tripping device of a circuit breaker such as a molded case circuit breaker and an earth leakage circuit breaker.
- a circuit breaker such as a molded case circuit breaker and an earth leakage circuit breaker is configured such that when a short circuit, earth leakage, or the like occurs in a circuit connected to the circuit breaker, a tripping mechanism automatically trips to interrupt the aforementioned circuit based on a tripping signal generated by detecting the short circuit, earth leakage, or the like.
- a circuit breaker is provided with a release type electromagnetic device having an electromagnetic coil energized based on the tripping signal and a plunger that is released to move at the time of energizing the electromagnetic coil and the circuit breaker interrupts the circuit by tripping the tripping mechanism by the movement of the plunger of the release type electromagnetic device.
- the release type electromagnetic device is composed of the electromagnetic coil, a yoke, a permanent magnet, the plunger, a release spring, and the like.
- the plunger is suctioned and retained to the yoke by the permanent magnet; however, at the same time, the release spring is biased in a direction of removing the suction. Normally, the suction force of the permanent magnet exceeds the biasing force of the release spring and thus the plunger is suctioned and retained.
- the plunger is separated from the yoke by the force of the release spring to perform the tripping operation of the circuit breaker.
- Patent Document 1 discloses a release type electromagnetic device in which an opening end of a main yoke is blocked by an end part yoke. The details of such a release type electromagnetic device will be described based on a sectional view of Fig. 18 .
- a yoke 1 is composed of a bottom side yoke body 1a that retains a permanent magnet 2, a main yoke 1c which is bent from the bottom side yoke body 1a and has an opening end 1b, and an end part yoke 1d that blocks the opening end 1b of the main yoke 1c.
- a transfer yoke 3 After a permanent magnet 2, a transfer yoke 3, a bobbin 5 which is provided with a through hole 5b in a central portion 5a and in which an electromagnetic coil 4 is mounted on the outer peripheral surface of the central portion 5a between a first bobbin frame body 5c and a second bobbin frame body 5d, and a first insertion pipe 6 inserted in the through hole 5b of the bobbin 5 are contained in the bottom side yoke body 1a and the main yoke 1c, the opening end 1b of the main yoke 1c is blocked by the end part yoke 1d to constitute the yoke 1 composed of the end part yoke 1d, the main yoke 1c, and the bottom side yoke body 1a.
- a cutout portion 5e is formed on the inner peripheral side of the second bobbin frame body 5d of the bobbin 5 and one side 6a of the first insertion pipe 6 is bent on the radially outer side and is engaged with the cutout portion 5e of the second bobbin frame body 5d of the bobbin 5 so that the first insertion pipe 6 is not slipped out from the bobbin 5.
- the other side 6b of the first insertion pipe 6 is arranged so as not to protrude on the axially outer side from the first bobbin frame body 5c of the bobbin 5.
- a boss portion 1d2 having a through hole 1d1 whose diameter is the same diameter as or slightly larger than the inner diameter of the first insertion pipe 6 is provided in a central portion of the end part yoke 1d.
- a plunger 7 is inserted through the through hole 1d1 of the boss portion 1d2 of the end part yoke 1d and the inner peripheral side of the first insertion pipe 6 from one side 7a of the plunger 7; and a first insertion portion 7b of the plunger 7 is axially movable in the first insertion pipe 6.
- a second insertion portion 7c of the plunger 7 is located in the through hole 1d1 of the boss portion 1d2 of the end part yoke 1d and its diameter is formed in a diameter smaller than the diameter of the first insertion portion 7b.
- the diameter of the other side 7d of the plunger 7 is formed in a diameter smaller than the diameter of the second insertion portion 7c; and a stepped portion 7e is formed between the other side 7d of the plunger 7 and the second insertion portion 7c of the plunger 7.
- a second insertion pipe 8 is fitted onto the outer peripheral surface of the second insertion portion 7c of the plunger 7 and is axially movable in the through hole 1d1 of the boss portion 1d2 of the end part yoke 1d.
- One side 8a of the second insertion pipe 8 is located so as not to strike against the other side 6b of the first insertion pipe 6 when one side 7a of the plunger 7 comes into contact with the transfer yoke 3 by the suction force of the permanent magnet 2; and the other side 8b of the second insertion pipe 8 is bent on the outer peripheral surface side of the other side 7d of the plunger 7 so as to be along the stepped portion 7e formed between the other side 7d of the plunger 7 and the second insertion portion 7c of the plunger 7.
- a plate 9 is arranged on the shaft end portion side of the other side 7d of the plunger 7 and is fixed by a fixing support body 10.
- the plate 9 is pressed by the spring force of a plate spring 11 fitted onto the other side 7d of the plunger 7 between the plate 9 and the other side 8b of the second insertion pipe 8 bent so as to be along the stepped portion 7e of the plunger 7 and is fixed to the fixing support body 10.
- a release spring 12 is arranged on the outer peripheral side of the boss portion 1d2 of the end part yoke 1d between the plate 9 and the end part yoke 1d of the yoke 1.
- the release spring 12 is arranged so that the biasing force that separates the plunger 7 from the transfer yoke 3 is maintained when one side 7a of the plunger 7 comes into contact with the transfer yoke 3 by the suction force of the permanent magnet 2.
- Patent Document 1 Japanese Examined Patent Publication No. 524898
- the yoke 1 is composed of two: the main yoke 1c; and the end part yoke 1d provided with the boss portion 1d2 having the through hole 1d1. Accordingly, there exist problems in that the number of components is increased; and when the main yoke 1c and the end part yoke 1d are joined by caulking or the like, control of magnetic resistance generated in a joint portion between the main yoke 1c and the end part yoke 1d is difficult and release characteristics are not stable.
- the plunger 7 is configured in a three-stage diameter: the first insertion portion 7b, the second insertion portion 7c having the diameter smaller than the diameter of the first insertion portion 7b, and the other side 7d having the diameter smaller than the diameter of the second insertion portion 7c; and accordingly, a problem exists in that the plunger 7 is a complicated shape.
- the pipe through which the plunger 7 is inserted is composed of two pipes: the first insertion pipe 6 inserted into the through hole 5b of the bobbin 5; and the second insertion pipe 8 fitted onto the outer peripheral surface of the second insertion portion 7c of the plunger 7. Accordingly, there exist problems in that the number of components is increased and there is provided a complicated shape having structure in which one side 6a of the first insertion pipe 6 is bent to the radially outer side to be brought into engagement with the cutout portion 5e formed in the second bobbin frame body 5d of the bobbin 5 and the first insertion pipe 6 is not slipped out from the bobbin 5.
- positioning of the permanent magnet 2 and the transfer yoke 3 is performed by engaging the transfer yoke 3 in a protrusion portion 5f that slightly protrudes from the second bobbin frame body 5d of the bobbin 5 to the bottom side yoke body 1a side of the yoke 1.
- the protrusion portion 5f slightly protrudes to the bottom side yoke body 1a side of the yoke 1; and accordingly, a problem exists in that the positioning of the permanent magnet 2 and the transfer yoke 3 is far from being stably and reliably performed.
- the present invention has been made to solve the problems described above, and an object of the present invention is to provide a release type electromagnetic device capable of obtaining stable release characteristics.
- Another object of the present invention is to provide a release type electromagnetic device capable of reducing the number of components to achieve simplification of assembly work.
- a release type electromagnetic device as set forth in claim 1 and including: a bobbin in which a through hole is provided in a central portion, and an electromagnetic coil is mounted on the outer peripheral surface of the central portion between a first bobbin frame body and a second bobbin frame body; a transfer yoke arranged on the second bobbin frame body side of the bobbin; a permanent magnet arranged on the transfer yoke; a yoke in which the bobbin, the electromagnetic coil, the transfer yoke, and the permanent magnet are contained in an inner space; an insertion pipe inserted in the through hole of the bobbin; a plunger which is inserted in the inner periphery of the insertion pipe, and moves in a direction of coming into contact with or separating from the transfer yoke; and a release spring which biases the plunger in the direction of separating from the transfer yoke, the plunger being retained at a position coming into contact with the transfer yoke by
- the yoke is configured by arranging a plunger pass-through side yoke body which is located on the first bobbin frame body side of the bobbin and has a through hole communicated with the through hole of the bobbin, by arranging central side yoke bodies each of which is bent from the plunger pass-through side yoke body to the permanent magnet side, and by arranging permanent magnet side yoke bodies each of which is bent from each of the central side yoke bodies to the center side of the through hole of the bobbin to come into contact with the permanent magnet and to form a yoke closing portion at both end surfaces.
- a method of manufacturing a release type electromagnetic device including the steps of: mounting an electromagnetic coil on the outer peripheral surface of a central portion between a first bobbin frame body and a second bobbin frame body of a bobbin provided with a through hole in the central portion; containing a transfer yoke and a permanent magnet in a surrounding portion provided in the second bobbin frame body of the bobbin; inserting an assembly body containing the transfer yoke and the permanent magnet in the surrounding portion of the second bobbin frame body of the bobbin into a yoke configured by arranging a plunger pass-through side yoke body which is located on the first bobbin frame body side of the bobbin and has a through hole communicated with the through hole of the bobbin, by arranging central side yoke bodies each of which is bent from the plunger pass-through side yoke body to the permanent magnet side, and by arranging permanent magnet side yoke bodies each of which is
- the yoke in which the bobbin, the electromagnetic coil, the transfer yoke, and the permanent magnet are contained in the inner space, is configured by arranging the plunger pass-through side yoke body which is located on the first bobbin frame body side of the bobbin and has the through hole communicate with the through hole of the bobbin, by arranging the central side yoke bodies each of which is bent from the plunger pass-through side yoke body to the permanent magnet side, and by arranging the permanent magnet side yoke bodies each of which is bent from each of the central side yoke bodies to the center side of the through hole of the bobbin to come into contact with the permanent magnet and to form the yoke closing portion at both end surfaces, whereby there can be obtained a release type electromagnetic device capable of obtaining stable release characteristics.
- Fig. 1 is a sectional view showing a release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 2 is an exploded development perspective view showing the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 3 is a perspective view showing a yoke in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 4 is a perspective view showing a bobbin and an electromagnetic coil in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 5 is a perspective view showing a state where the bobbin and the electromagnetic coil are assembled, in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 6 is a perspective view showing an assembly body of the bobbin and the electromagnetic coil, a transfer yoke, and a permanent magnet in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 7 is a perspective view showing a state before an assembly body of the bobbin, the electromagnetic coil, the transfer yoke, and the permanent magnet is contained in the yoke, in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 5 is a perspective view showing a state where the bobbin and the electromagnetic coil are assembled, in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 6 is a perspective view showing an assembly body of the bobbin and the electromagnetic coil, a transfer yoke, and a permanent magnet in the release type electromagnetic
- FIG. 8 is a perspective view showing a state where the assembly body of the bobbin, the electromagnetic coil, the transfer yoke, and the permanent magnet is contained in the yoke, in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 9 is a perspective view showing a state before an insertion pipe is contained in an assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, and the yoke, in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 9 is a perspective view showing a state before an insertion pipe is contained in an assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, and the yoke, in the release type electromagnetic device according to Embodiment 1 of the present invention.
- FIG. 10 is a perspective view showing a state where the insertion pipe is contained in the assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, and the yoke, in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 11 is a perspective view showing a state before a plunger is contained in an assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, the yoke, and the insertion pipe, in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 12 is an exploded development perspective view of the plunger in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 11 is a perspective view showing a state before a plunger is contained in an assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, the yoke, and the insertion pipe, in the release type electromagnetic device according to Embodiment 1 of
- FIG. 13 is a perspective view showing the plunger and a fixing support body in the release type electromagnetic device according to Embodiment 1 of the present invention.
- Fig. 14 is a perspective view showing a state where the plunger is contained in the assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, the yoke, and the insertion pipe, in the release type electromagnetic device according to Embodiment 1 of the present invention.
- a yoke 101 made of a magnetic material is configured by arranging a plunger pass-through side yoke body 101a which is located on the first bobbin frame body 102c side of a bobbin 102 and has a through hole 101a1, which is communicated with a through hole 102a formed in a central portion 102b of the bobbin 102 and is formed in a diameter substantially the same diameter as the through hole 102a, by arranging central side yoke bodies 101b each of which is bent from the plunger pass-through side yoke body 101a to the permanent magnet 103 side, and by arranging permanent magnet side yoke bodies 101c each of which is bent from each of the central side yoke bodies 101b to the center side of the through hole 102a of the bobbin 102 to come into contact with the permanent magnet and to form a yoke closing portion 101d at both end surfaces 101c1.
- the yoke 101 is configured by bending a single plate into a rectangular shape to form the yoke closing portion 101d at the position of both end surfaces 101c1 of the permanent magnet side yoke bodies 101c that come into contact with the permanent magnet 103.
- the yoke closing portion 101d is provided in a direction orthogonal to the axial direction of a plunger 107 (to be described later), for example, provided linearly.
- An electromagnetic coil 104 is mounted on the outer peripheral surface of the central portion 102b between the first bobbin frame body 102c of the bobbin 102 and the second bobbin frame body 102d of the bobbin 102.
- a surrounding portion 102d1 extended with a slight gap against the permanent magnet side yoke bodies 101c is provided in the second bobbin frame body 102d of the bobbin 102; positioning is performed by containing a transfer yoke 105 made of a magnetic material in the surrounding portion 102d1; and positioning of the permanent magnet 103 positioned on the transfer yoke 105 is also performed in the surrounding portion 102d1 by positioning the transfer yoke 105.
- An insertion pipe 106 made of a non-magnetic material is inserted through the through hole 101a1 of the plunger pass-through side yoke body 101a of the yoke 101 and the through hole 102a of the bobbin 102.
- One side 106a of the insertion pipe 106 is extended until a position not coming into contact with the transfer yoke 105; and the other side 106b of the insertion pipe 106 forms a receiving seat 106b1 which is extended on the radially outer side from the through hole 101a1 of the plunger pass-through side yoke body 101a on the outside of the plunger pass-through side yoke body 101a and receives a release spring 111 (to be described later).
- One side 106a, the other side 106b, and the receiving seat 106b1 are formed in one constitutional body.
- An insertion portion 107a of the plunger 107 is inserted in the inner periphery of the insertion pipe 106; the plunger 107 moves in a direction of coming into contact with or separating from the transfer yoke 105 in the insertion pipe 106; and one side 107b of the plunger 107 comes into contact with or separates from the transfer yoke 105.
- the other side 107c of the plunger 107 which has a diameter smaller than a diameter of the insertion portion 107a, is arranged at a position where the insertion portion 107a of the plunger 107 is located on the outside of the plunger pass-through side yoke body 101a; and a stepped portion 107d is formed between the insertion portion 107a of the plunger 107 and the other side 107c of the plunger 107.
- a plate 108 is arranged on the shaft end portion side of the other side 107c of the plunger 107 and is fixed by a fixing support body 109.
- the plate 108 is pressed by the spring force of a plate spring 110 fitted onto the other side 107c of the plunger 107 between the plate 108 and the stepped portion 107d of the plunger 107 and is fixed to the fixing support body 109.
- the release spring 111 is arranged between the plate 108 and the receiving seat 106b1 of the other side 106b of the insertion pipe 106 on the outer peripheral side of the insertion portion 107a of the plunger 107, which is located on the outside of the plunger pass-through side yoke body 101a.
- the release spring 111 is arranged so as to maintain biasing force that separates the plunger 107 from the transfer yoke 105 when one side 107b of the plunger 107 comes into contact with the transfer yoke 105 by the suction force of the permanent magnet 103.
- FIG. 1 shows a state in which the plunger 107 is arranged at a reset position by the reset operation of a circuit breaker (not shown in the drawing) .
- magnetic flux of the permanent magnet 103 returns from an N-pole to an S-pole via the transfer yoke 105; the plunger 107; the insertion pipe 106; and the plunger pass-through side yoke body 101a, the central side yoke body 101b, and the permanent magnet side yoke body 101c of the yoke 101.
- Fig. 1 shows the state in which one side 107b of the plunger 107 comes into contact with the transfer yoke 105 by the suction force of the permanent magnet 103 and the magnetic flux circuit X by the permanent magnet 103 is formed.
- the suction force of the permanent magnet 103 is a larger suction force than the biasing force of the release spring 111 and the plunger 107 is suctioned and retained to the transfer yoke 105 by the suction force of the permanent magnet 103.
- the magnetic flux returns to the plunger 107 via the plunger 107; the transfer yoke 105; the permanent magnet side yoke body 101c, the central side yoke body 101b, and the plunger pass-through side yoke body 101a of the yoke 101; and the insertion pipe 106, as shown by a magnetic flux circuit Y.
- the magnetic flux is generated so as to cancel the suction force of the permanent magnet 103.
- the plunger 107 is separated from the transfer yoke 105 by the biasing force Fs of the release spring 111 to be protruded and moved to the outer upper side of the plunger pass-through side yoke body 101a of the yoke 101 on the paper surface of Fig. 1 and a tripping mechanism (not shown in the drawing) trips the circuit.
- the release type electromagnetic device in this Embodiment 1 solves the problem in which, as described in the above conventional release type electromagnetic device, since the yoke 1 is composed of two: the main yoke 1c; and the end part yoke 1d provided with the boss portion 1d2 having the through hole 1d1, the control of magnetic resistance generated in the joint portion between the main yoke 1c and the end part yoke 1d is difficult and the release characteristics are not stable.
- the yoke 101 in this Embodiment 1 is configured by bending the single plate into the rectangular shape and is configured by arranging the plunger pass-through side yoke body 101a which is located on the first bobbin frame body 102c side of the bobbin 102 and has the through hole 101a1 which is communicated with the through hole 102a formed in the central portion 102b of the bobbin 102 and is formed in the diameter substantially the same diameter as the through hole 102a, by arranging the central side yoke bodies 101b each of which is bent from the plunger pass-through side yoke body 101a to the permanent magnet 103 side, and by arranging the permanent magnet side yoke bodies 101c each of which is bent from each of the central side yoke bodies 101b to the center side of the through hole 102a of the bobbin 102 to come into contact with the permanent magnet and to form the yoke closing portion 101d at both end surfaces 101c1.
- the yoke 101 is configured by bending the single plate into the rectangular shape to form the yoke closing portion 101d at the position of both end surfaces 101c1 of the permanent magnet side yoke bodies 101c that come into contact with the permanent magnet 103.
- a plated film thickness and/or an air gap generated at the aforementioned conventional joint portion is eliminated and magnetic flux fluctuations can be remarkably reduced; and therefore, stable release characteristics can be secured.
- the plunger 107 is not configured in the three-stage diameter of the first insertion portion 7b, the second insertion portion 7c having the diameter smaller than the diameter of the first insertion portion 7b, and the other side 7d having the diameter smaller than the diameter of the second insertion portion 7c, as described in the above conventional one; but the plunger 107 is configured in a two-stage diameter of the insertion portion 107a and the other side 107c and a simple shape can be achieved.
- the insertion pipe 106 is inserted through the through hole 101a1 of the plunger pass-through side yoke body 101a of the yoke 101 and the through hole 102a of the bobbin 102.
- One side 106a of the insertion pipe 106 is extended until the position not coming into contact with the transfer yoke 105, one side 106a being not processed at all; and the other side 106b of the insertion pipe 106 forms a receiving seat 106b1 which is extended on the radially outer side from the through hole 101a1 of the plunger pass-through side yoke body 101a on the outside of the plunger pass-through side yoke body 101a and receives a release spring 111.
- the insertion pipe 106 is not one which is composed of two pipes: the first insertion pipe 6 inserted into the through hole 5b of the bobbin 5; and the second insertion pipe 8 fitted onto the outer peripheral surface of the second insertion portion 7c of the plunger 7, as described in the above conventional one. Then, the insertion pipe 106 is not a complicated shape having the structure in which one side 6a of the first insertion pipe 6 is bent to the radially outer side to be brought into engagement with the cutout portion 5e formed in the second bobbin frame body 5d of the bobbin 5 and the first insertion pipe 6 is not slipped out from the bobbin 5. However, the insertion pipe 106 can be formed in one constitutional body having the simple structure; and therefore, the number of components can be reduced to achieve simple assembly.
- the insertion pipe 106 is inserted through the through hole 101a1 of the plunger pass-through side yoke body 101a of the yoke 101 and the through hole 102a of the bobbin 102; and thus, positional deviations of the yoke 101 and the bobbin 102 can be suppressed.
- the insertion pipe 106 is made of the non-magnetic material and secures a magnetic gap between the yoke 101 and the plunger 107; and therefore, the insertion pipe 106 has function as a plunger guide.
- the other side 106b of the insertion pipe 106 is provided with the receiving seat 106b1, which is extended on the radially outer side from the through hole 101a1 of the plunger pass-through side yoke body 101a on the outside of the plunger pass-through side yoke body 101a and receives the release spring 111. Then, the position of the insertion pipe 106 is set by being pressed to the plunger pass-through side yoke body 101a of the yoke 101 by the biasing force of the release spring 111; and therefore, work such as adhesion is not required and simplification of assembly work can be achieved.
- the number of components can be reduced to achieve a simple shape; and therefore, much trouble and labor are not required for such assembly work, simple assembly work can be performed, and assembly work can be performed simply and in a short time.
- the surrounding portion 102d1 extended with the slight gap against the permanent magnet side yoke bodies 101c is provided in the second bobbin frame body 102d of the bobbin 102 and the transfer yoke 105 made of the magnetic material and the permanent magnet 103 positioned on the transfer yoke 105 are merely contained in the surrounding portion 102d1, whereby the positioning can be stably and reliably performed.
- Fig. 2 shows the exploded development perspective view of the entire release type electromagnetic device.
- Fig. 3 is the perspective view showing the yoke 101 in Embodiment 1.
- the yoke 101 is configured by bending the single plate into the rectangular shape; and the yoke 101 is composed of the plunger pass-through side yoke body 101a having the through hole 101a1, the central side yoke bodies 101b each of which is bent from the plunger pass-through side yoke body 101a to the permanent magnet 103 side, and the permanent magnet side yoke bodies 101c each of which is bent to the center side to come into contact with the permanent magnet and to form the yoke closing portion 101d at both end surfaces 101c1.
- the yoke 101 is formed by bending the single plate into the rectangular shape, the number of components can be reduced, magnetic resistance does not exist because of no joint portion, and the release characteristics can be stabilized; as compared to one which is composed of the main yoke 1c having the opening end 1b bent from the bottom side yoke body 1a and the end part yoke 1d that blocks the opening end 1b of the main yoke 1c, as described in the above conventional one.
- the electromagnetic coil 104 is mounted on the outer peripheral surface of the central portion 102b between the first bobbin frame body 102c of the bobbin 102 and the second bobbin frame body 102d of the bobbin 102.
- the transfer yoke 105 is contained in the surrounding portion 102d1 to perform positioning of the transfer yoke 105, the surrounding portion 102d1 being provided in the second bobbin frame body 102d of the bobbin 102 on which the electromagnetic coil 104 is mounted; and the permanent magnet 103 is attached to an concaved portion of the transfer yoke 105 to perform positioning.
- the transfer yoke 105 and the permanent magnet 103 are merely contained in the surrounding portion 102d1 provided in the second bobbin frame body 102d of the bobbin 102, whereby the positioning can be stably, reliably, and simply performed. Furthermore, the transfer yoke 105 is retained in the surrounding portion 102d1 of the second bobbin frame body 102d of the bobbin 102 by mounting screws 112.
- the surrounding portion 102d1 in which the whole of the transfer yoke 105 and the permanent magnet 103 are contained is provided in the second bobbin frame body 102d of the bobbin 102, whereby the positioning of the transfer yoke 105 and the permanent magnet 103 can be stably, simply, and reliably performed.
- the cutout portion 5e which is described in the above conventional one is not formed on the through hole 102a side of the second bobbin frame body 102d of the bobbin 102, thereby providing a simple structure.
- an assembly body in which the transfer yoke 105 and the permanent magnet 103 are contained in the surrounding portion 102d1 provided in the second bobbin frame body 102d of the bobbin 102 is inserted into a space of the yoke 101 from an opening portion of the yoke 101 until a position where the through hole 102a of the bobbin 102 corresponds to the through hole 101a1 of the plunger pass-through side yoke body 101a of the yoke 101.
- the cutout portion 5e which is described in the above conventional one, is not formed on the through hole 102a side of the second bobbin frame body 102d of the bobbin 102. Therefore, such a configuration is not the complicated shape in which one side 6a of the first insertion pipe 6 is bent on the radially outer side to be brought into engagement with the cutout portion 5e formed in the second bobbin frame body 5d of the bobbin 5 and the first insertion pipe 6 is not slipped out from the bobbin 5 as described in the above conventional one; but the configuration is a significantly simple structure and assembling performance is also simple.
- the insertion pipe 106 is sequentially inserted into the through hole 101a1 of the plunger pass-through side yoke body 101a of the yoke 101 and the through hole 102a of the bobbin 102 from one side 106a of the insertion pipe 106 from the outside of the plunger pass-through side yoke body 101a of the yoke 101, so that the other side 106b extended to the radially outer side of the insertion pipe 106 is brought into contact with the plunger pass-through side yoke body 101a of the yoke 101.
- one side 106a of the insertion pipe 106 is not bent to the radially outer side as described in the above conventional one, but one side 106a merely faces the transfer yoke 105 with a predetermined distance and any processing is not applied, thereby providing simple structure.
- the plate spring 110 is fitted onto the other side 107c of the plunger 107; an end portion of the other side 107c of the plunger 107 is inserted through the through hole 108a of the plate 108; the release spring 111 is fitted onto the plunger 107 after fixing the plate 108 and the plate spring 110 to the plunger 107 by the fixing support body 109; and the plunger 107 is inserted through the insertion pipe 106 from one side 107b of the plunger 107 until the insertion portion 107a of the plunger 107 is inserted in the insertion pipe 106, whereby the release spring 111 is arranged so as to have a predetermined biasing force between the receiving seat 106b1 that is the other side 106b of the insertion pipe 106 and the plate 108.
- the plunger 107 is configured in the two-stage diameter of the insertion portion 107a and the other side 107c and the simple shape is achieved.
- the plunger 107 is not one in which the plunger 7 is configured in the three-stage diameter of the first insertion portion 7b, the second insertion portion 7c having the diameter smaller than the diameter of the first insertion portion 7b, and the other side 7d having the diameter smaller than the diameter of the second insertion portion 7c as described in the above conventional one.
- magnetization to the permanent magnet 103 is performed either in the state of the assembly body shown in Fig. 10 or the state of the assembly body shown in Fig. 14 ; and the plunger 107 is suctioned and retained to the transfer yoke 105 by the suction force of the permanent magnet 103.
- the configuration of respective components of the release type electromagnetic device is simplified and the number of components is reduced, whereby much trouble and labor are not required for such an assembly work, simple assembly work can be performed, and assembly work can be performed simply and in a short time.
- FIG. 15 is a perspective view showing a yoke in a release type electromagnetic device according to Embodiment 2 of the present invention.
- Embodiment 1 the description has been made on the case where the yoke closing portion 101d formed at the position of both end surfaces 101c1 of the permanent magnet side yoke bodies 101c of the yoke 101 are provided in the direction orthogonal to the axial direction of the plunger 107, for example, provided linearly.
- this Embodiment 2 is configured such that a yoke closing portion 101e formed at the position of both end surfaces 101c1 of permanent magnet side yoke bodies 101c of a yoke 101 are provided with concavity and convexity which are engaged with each other.
- the yoke closing portion 101e of the yoke 101 is configured such that a triangle-shaped convex portion and a triangle-shaped concave portion are engaged with each other, and magnetic characteristics can be more improved than the aforementioned Embodiment 1.
- FIG. 16 is a perspective view showing a release type electromagnetic device according to Embodiment 3 of the present invention.
- a yoke closing portion 101e of the yoke 101 is provided with the triangle-shaped convex portion and the triangle-shaped concave portion which are engaged with each other.
- a yoke closing portion 101f of a yoke 101 is provided with a quadrangle-shaped convex portion and a quadrangle-shaped concave portion which are engaged with each other and the same effect as the aforementioned Embodiment 2 can be exhibited.
- FIG. 17 is a perspective view showing a yoke in a release type electromagnetic device according to Embodiment 4 of the present invention.
- the yoke 101 formed in such a rectangular shape is easy to be deflected and deformed if external force is applied after forming; and accordingly, the yoke closing portion 101d of the yoke 101 is opened and possibility of influence on magnetic characteristics is generated.
- the yoke closing portion 101e of the yoke 101 in the aforementioned Embodiment 2 is provided with the triangle-shaped convex portion and the triangle-shaped concave portion which are engaged with each other; and the yoke closing portion 101f of the yoke 101 in the aforementioned Embodiment 3 is provided with the quadrangle-shaped convex portion and the quadrangle-shaped concave portion which are engaged with each other. Even if those yoke closing portions 101e, 101f are opened, concavo-convex engagement is maintained and therefore the influence on the magnetic characteristics can be suppressed.
- the shape of a yoke closing portion 101g of a yoke 101 is brought into concavo-convex engagement in an intricate shape, thereby providing structure in which the yoke closing portion 101g of the yoke 101 is not deformed and opened. More specifically, in the concavo-convex engagement, the size of a convex end portion is larger than the size of a convex base portion in both end surfaces 101c1 of permanent magnet side yoke bodies 101c of the yoke 101; and the size of a concave end portion is smaller than the size of a concave base portion in both end surfaces 101c1.
- the convex end portion is engaged with the concave base portion; and the convex base portion is engaged with the concave end portions. Since both end surfaces 101c1 are configured in this way, the permanent magnet side yoke bodies 101c of the yoke 101 are bent to be brought into concavo-convex engagement of the yoke closing portion 101g of the yoke 101, whereby the yoke closing portion 101g of the yoke 101 can be prevented from being opened and any influence is not exerted on magnetic characteristics.
- the yoke is configured by bending the single plate into the rectangular shape to form the yoke closing portion at the position of both end surfaces of the permanent magnet side yoke bodies that come into contact with the permanent magnet.
- the yoke closing portions of the yoke are not limited to the aforementioned respective embodiments and the shape of other yoke closing portions can be provided.
- the present invention can freely combine the respective embodiments and appropriately modify and/or omit the respective embodiments, within the scope of the present invention as defined in the appended claims.
- the present invention is suitable for achieving a release type electromagnetic device capable of obtaining stable release characteristics.
Description
- The present invention relates to a release type electromagnetic device and a method of manufacturing the same, the device being used as a tripping device of a circuit breaker such as a molded case circuit breaker and an earth leakage circuit breaker.
- As is well known, a circuit breaker such as a molded case circuit breaker and an earth leakage circuit breaker is configured such that when a short circuit, earth leakage, or the like occurs in a circuit connected to the circuit breaker, a tripping mechanism automatically trips to interrupt the aforementioned circuit based on a tripping signal generated by detecting the short circuit, earth leakage, or the like. Such a circuit breaker is provided with a release type electromagnetic device having an electromagnetic coil energized based on the tripping signal and a plunger that is released to move at the time of energizing the electromagnetic coil and the circuit breaker interrupts the circuit by tripping the tripping mechanism by the movement of the plunger of the release type electromagnetic device.
- The release type electromagnetic device is composed of the electromagnetic coil, a yoke, a permanent magnet, the plunger, a release spring, and the like. The plunger is suctioned and retained to the yoke by the permanent magnet; however, at the same time, the release spring is biased in a direction of removing the suction. Normally, the suction force of the permanent magnet exceeds the biasing force of the release spring and thus the plunger is suctioned and retained. However, at the time of detecting the tripping signal, when current is supplied to the electromagnetic coil in polarities that weaken the magnetic force of the permanent magnet and the suction force is reduced than the biasing force of the release spring, the plunger is separated from the yoke by the force of the release spring to perform the tripping operation of the circuit breaker.
- Heretofore, as release type electromagnetic devices used for circuit breakers, there is one, for example, disclosed in
Patent Document 1 andFig. 18 .Patent Document 1 discloses a release type electromagnetic device in which an opening end of a main yoke is blocked by an end part yoke. The details of such a release type electromagnetic device will be described based on a sectional view ofFig. 18 . InFig. 18 , ayoke 1 is composed of a bottom side yoke body 1a that retains apermanent magnet 2, amain yoke 1c which is bent from the bottom side yoke body 1a and has anopening end 1b, and anend part yoke 1d that blocks theopening end 1b of themain yoke 1c. After apermanent magnet 2, atransfer yoke 3, abobbin 5 which is provided with athrough hole 5b in acentral portion 5a and in which anelectromagnetic coil 4 is mounted on the outer peripheral surface of thecentral portion 5a between a firstbobbin frame body 5c and a secondbobbin frame body 5d, and afirst insertion pipe 6 inserted in the throughhole 5b of thebobbin 5 are contained in the bottom side yoke body 1a and themain yoke 1c, theopening end 1b of themain yoke 1c is blocked by theend part yoke 1d to constitute theyoke 1 composed of theend part yoke 1d, themain yoke 1c, and the bottom side yoke body 1a. - A cutout portion 5e is formed on the inner peripheral side of the second
bobbin frame body 5d of thebobbin 5 and oneside 6a of thefirst insertion pipe 6 is bent on the radially outer side and is engaged with the cutout portion 5e of the secondbobbin frame body 5d of thebobbin 5 so that thefirst insertion pipe 6 is not slipped out from thebobbin 5. Theother side 6b of thefirst insertion pipe 6 is arranged so as not to protrude on the axially outer side from the firstbobbin frame body 5c of thebobbin 5. - A boss portion 1d2 having a through hole 1d1 whose diameter is the same diameter as or slightly larger than the inner diameter of the
first insertion pipe 6 is provided in a central portion of theend part yoke 1d. Aplunger 7 is inserted through the through hole 1d1 of the boss portion 1d2 of theend part yoke 1d and the inner peripheral side of thefirst insertion pipe 6 from oneside 7a of theplunger 7; and afirst insertion portion 7b of theplunger 7 is axially movable in thefirst insertion pipe 6. - A
second insertion portion 7c of theplunger 7 is located in the through hole 1d1 of the boss portion 1d2 of theend part yoke 1d and its diameter is formed in a diameter smaller than the diameter of thefirst insertion portion 7b. The diameter of theother side 7d of theplunger 7 is formed in a diameter smaller than the diameter of thesecond insertion portion 7c; and astepped portion 7e is formed between theother side 7d of theplunger 7 and thesecond insertion portion 7c of theplunger 7. Asecond insertion pipe 8 is fitted onto the outer peripheral surface of thesecond insertion portion 7c of theplunger 7 and is axially movable in the through hole 1d1 of the boss portion 1d2 of theend part yoke 1d. - One
side 8a of thesecond insertion pipe 8 is located so as not to strike against theother side 6b of thefirst insertion pipe 6 when oneside 7a of theplunger 7 comes into contact with thetransfer yoke 3 by the suction force of thepermanent magnet 2; and theother side 8b of thesecond insertion pipe 8 is bent on the outer peripheral surface side of theother side 7d of theplunger 7 so as to be along thestepped portion 7e formed between theother side 7d of theplunger 7 and thesecond insertion portion 7c of theplunger 7. - A
plate 9 is arranged on the shaft end portion side of theother side 7d of theplunger 7 and is fixed by afixing support body 10. Theplate 9 is pressed by the spring force of aplate spring 11 fitted onto theother side 7d of theplunger 7 between theplate 9 and theother side 8b of thesecond insertion pipe 8 bent so as to be along thestepped portion 7e of theplunger 7 and is fixed to thefixing support body 10. - A
release spring 12 is arranged on the outer peripheral side of the boss portion 1d2 of theend part yoke 1d between theplate 9 and theend part yoke 1d of theyoke 1. Therelease spring 12 is arranged so that the biasing force that separates theplunger 7 from thetransfer yoke 3 is maintained when oneside 7a of theplunger 7 comes into contact with thetransfer yoke 3 by the suction force of thepermanent magnet 2. - [Patent Document 1] Japanese Examined Patent Publication No.
524898 - Further attention is drawn to documents
DE 89 00 779 U1 andDE 10 2008 057738 A1 - In the aforementioned conventional release type electromagnetic device, the
yoke 1 is composed of two: themain yoke 1c; and theend part yoke 1d provided with the boss portion 1d2 having the through hole 1d1. Accordingly, there exist problems in that the number of components is increased; and when themain yoke 1c and theend part yoke 1d are joined by caulking or the like, control of magnetic resistance generated in a joint portion between themain yoke 1c and theend part yoke 1d is difficult and release characteristics are not stable. - Furthermore, the
plunger 7 is configured in a three-stage diameter: thefirst insertion portion 7b, thesecond insertion portion 7c having the diameter smaller than the diameter of thefirst insertion portion 7b, and theother side 7d having the diameter smaller than the diameter of thesecond insertion portion 7c; and accordingly, a problem exists in that theplunger 7 is a complicated shape. - Besides, the pipe through which the
plunger 7 is inserted is composed of two pipes: thefirst insertion pipe 6 inserted into thethrough hole 5b of thebobbin 5; and thesecond insertion pipe 8 fitted onto the outer peripheral surface of thesecond insertion portion 7c of theplunger 7. Accordingly, there exist problems in that the number of components is increased and there is provided a complicated shape having structure in which oneside 6a of thefirst insertion pipe 6 is bent to the radially outer side to be brought into engagement with the cutout portion 5e formed in the secondbobbin frame body 5d of thebobbin 5 and thefirst insertion pipe 6 is not slipped out from thebobbin 5. - As described above, the number of components is large and the shape is complicated; and accordingly, there exist problems in that much trouble and labor are required for such assembly work and much time is required for the assembly work.
- Furthermore, positioning of the
permanent magnet 2 and thetransfer yoke 3 is performed by engaging thetransfer yoke 3 in aprotrusion portion 5f that slightly protrudes from the secondbobbin frame body 5d of thebobbin 5 to the bottom side yoke body 1a side of theyoke 1. However, theprotrusion portion 5f slightly protrudes to the bottom side yoke body 1a side of theyoke 1; and accordingly, a problem exists in that the positioning of thepermanent magnet 2 and thetransfer yoke 3 is far from being stably and reliably performed. - The present invention has been made to solve the problems described above, and an object of the present invention is to provide a release type electromagnetic device capable of obtaining stable release characteristics.
- Furthermore, another object of the present invention is to provide a release type electromagnetic device capable of reducing the number of components to achieve simplification of assembly work.
- According to the present invention, there is provided a release type electromagnetic device as set forth in
claim 1 and including: a bobbin in which a through hole is provided in a central portion, and an electromagnetic coil is mounted on the outer peripheral surface of the central portion between a first bobbin frame body and a second bobbin frame body; a transfer yoke arranged on the second bobbin frame body side of the bobbin; a permanent magnet arranged on the transfer yoke; a yoke in which the bobbin, the electromagnetic coil, the transfer yoke, and the permanent magnet are contained in an inner space; an insertion pipe inserted in the through hole of the bobbin; a plunger which is inserted in the inner periphery of the insertion pipe, and moves in a direction of coming into contact with or separating from the transfer yoke; and a release spring which biases the plunger in the direction of separating from the transfer yoke, the plunger being retained at a position coming into contact with the transfer yoke by the suction force of the permanent magnet, and being released in the direction of separating from the transfer yoke by the biasing force of the release spring when the electromagnetic coil is energized to reduce the suction force of the permanent magnet. In the release type electromagnetic device, the yoke is configured by arranging a plunger pass-through side yoke body which is located on the first bobbin frame body side of the bobbin and has a through hole communicated with the through hole of the bobbin, by arranging central side yoke bodies each of which is bent from the plunger pass-through side yoke body to the permanent magnet side, and by arranging permanent magnet side yoke bodies each of which is bent from each of the central side yoke bodies to the center side of the through hole of the bobbin to come into contact with the permanent magnet and to form a yoke closing portion at both end surfaces. - Furthermore, there is provided a method of manufacturing a release type electromagnetic device as set forth in
claim 7, the method including the steps of: mounting an electromagnetic coil on the outer peripheral surface of a central portion between a first bobbin frame body and a second bobbin frame body of a bobbin provided with a through hole in the central portion; containing a transfer yoke and a permanent magnet in a surrounding portion provided in the second bobbin frame body of the bobbin; inserting an assembly body containing the transfer yoke and the permanent magnet in the surrounding portion of the second bobbin frame body of the bobbin into a yoke configured by arranging a plunger pass-through side yoke body which is located on the first bobbin frame body side of the bobbin and has a through hole communicated with the through hole of the bobbin, by arranging central side yoke bodies each of which is bent from the plunger pass-through side yoke body to the permanent magnet side, and by arranging permanent magnet side yoke bodies each of which is bent from each of the central side yoke bodies to the center side of the through hole of the bobbin to come into contact with the permanent magnet and to form a yoke closing portion at both end surfaces; inserting an insertion pipe from one side of the insertion pipe into the through hole of the plunger pass-through side yoke body of the yoke and the through hole of the bobbin until the other side of the insertion pipe comes into contact with the plunger pass-through side yoke body of the yoke; and arranging a release spring so as to have a predetermined biasing force between the other side of the insertion pipe and a plate by: fitting a plate spring onto the other side of the plunger, inserting an end portion of the other side of the plunger through a through hole of the plate, fitting the release spring onto the plunger after fixing the plate and the plate spring to the plunger by a fixing support body, and inserting the plunger from one side of the plunger through the insertion pipe until a pass-through portion of the plunger is inserted in the insertion pipe. - According to the release type electromagnetic device of the present invention, the yoke, in which the bobbin, the electromagnetic coil, the transfer yoke, and the permanent magnet are contained in the inner space, is configured by arranging the plunger pass-through side yoke body which is located on the first bobbin frame body side of the bobbin and has the through hole communicate with the through hole of the bobbin, by arranging the central side yoke bodies each of which is bent from the plunger pass-through side yoke body to the permanent magnet side, and by arranging the permanent magnet side yoke bodies each of which is bent from each of the central side yoke bodies to the center side of the through hole of the bobbin to come into contact with the permanent magnet and to form the yoke closing portion at both end surfaces, whereby there can be obtained a release type electromagnetic device capable of obtaining stable release characteristics.
- Furthermore, there can be obtained a release type electromagnetic device capable of reducing the number of components to achieve simplification of assembly work.
-
-
Fig. 1 is a sectional view showing a release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 2 is an exploded development perspective view showing the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 3 is a perspective view showing a yoke in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 4 is a perspective view showing a bobbin and an electromagnetic coil in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 5 is a perspective view showing a state where the bobbin and the electromagnetic coil are assembled, in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 6 is a perspective view showing an assembly body of the bobbin and the electromagnetic coil, a transfer yoke, and a permanent magnet in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 7 is a perspective view showing a state before an assembly body of the bobbin, the electromagnetic coil, the transfer yoke, and the permanent magnet is contained in the yoke, in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 8 is a perspective view showing a state where the assembly body of the bobbin, the electromagnetic coil, the transfer yoke, and the permanent magnet is contained in the yoke, in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 9 is a perspective view showing a state before an insertion pipe is contained in an assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, and the yoke, in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 10 is a perspective view showing a state where the insertion pipe is contained in the assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, and the yoke, in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 11 is a perspective view showing a state before a plunger is contained in an assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, the yoke, and the insertion pipe, in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 12 is an exploded development perspective view of the plunger in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 13 is a perspective view showing the plunger and a fixing support body in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 14 is a perspective view showing a state where the plunger is contained in the assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, the yoke, and the insertion pipe, in the release type electromagnetic device according toEmbodiment 1 of the present invention; -
Fig. 15 is a perspective view showing a yoke in a release type electromagnetic device according toEmbodiment 2 of the present invention; -
Fig. 16 is a perspective view showing a yoke in a release type electromagnetic device according toEmbodiment 3 of the present invention; -
Fig. 17 is a perspective view showing a yoke in a release type electromagnetic device according toEmbodiment 4 of the present invention; and -
Fig. 18 is a sectional view showing a conventional release type electromagnetic device. - Hereinafter,
Embodiment 1 of the present invention will be described with reference toFig. 1 to Fig. 14 . Then, in each of the drawings, identical or equivalent members and portions will be described with the same reference numerals (and letters) assigned thereto.Fig. 1 is a sectional view showing a release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 2 is an exploded development perspective view showing the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 3 is a perspective view showing a yoke in the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 4 is a perspective view showing a bobbin and an electromagnetic coil in the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 5 is a perspective view showing a state where the bobbin and the electromagnetic coil are assembled, in the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 6 is a perspective view showing an assembly body of the bobbin and the electromagnetic coil, a transfer yoke, and a permanent magnet in the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 7 is a perspective view showing a state before an assembly body of the bobbin, the electromagnetic coil, the transfer yoke, and the permanent magnet is contained in the yoke, in the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 8 is a perspective view showing a state where the assembly body of the bobbin, the electromagnetic coil, the transfer yoke, and the permanent magnet is contained in the yoke, in the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 9 is a perspective view showing a state before an insertion pipe is contained in an assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, and the yoke, in the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 10 is a perspective view showing a state where the insertion pipe is contained in the assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, and the yoke, in the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 11 is a perspective view showing a state before a plunger is contained in an assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, the yoke, and the insertion pipe, in the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 12 is an exploded development perspective view of the plunger in the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 13 is a perspective view showing the plunger and a fixing support body in the release type electromagnetic device according toEmbodiment 1 of the present invention.Fig. 14 is a perspective view showing a state where the plunger is contained in the assembly body of the bobbin, the electromagnetic coil, the transfer yoke, the permanent magnet, the yoke, and the insertion pipe, in the release type electromagnetic device according toEmbodiment 1 of the present invention. - In these respective drawings, a
yoke 101 made of a magnetic material is configured by arranging a plunger pass-throughside yoke body 101a which is located on the firstbobbin frame body 102c side of abobbin 102 and has a through hole 101a1, which is communicated with a throughhole 102a formed in acentral portion 102b of thebobbin 102 and is formed in a diameter substantially the same diameter as the throughhole 102a, by arranging centralside yoke bodies 101b each of which is bent from the plunger pass-throughside yoke body 101a to thepermanent magnet 103 side, and by arranging permanent magnetside yoke bodies 101c each of which is bent from each of the centralside yoke bodies 101b to the center side of the throughhole 102a of thebobbin 102 to come into contact with the permanent magnet and to form ayoke closing portion 101d at both end surfaces 101c1. More specifically, theyoke 101 is configured by bending a single plate into a rectangular shape to form theyoke closing portion 101d at the position of both end surfaces 101c1 of the permanent magnetside yoke bodies 101c that come into contact with thepermanent magnet 103. There is shown a case where theyoke closing portion 101d is provided in a direction orthogonal to the axial direction of a plunger 107 (to be described later), for example, provided linearly. - An
electromagnetic coil 104 is mounted on the outer peripheral surface of thecentral portion 102b between the firstbobbin frame body 102c of thebobbin 102 and the secondbobbin frame body 102d of thebobbin 102. A surrounding portion 102d1 extended with a slight gap against the permanent magnetside yoke bodies 101c is provided in the secondbobbin frame body 102d of thebobbin 102; positioning is performed by containing atransfer yoke 105 made of a magnetic material in the surrounding portion 102d1; and positioning of thepermanent magnet 103 positioned on thetransfer yoke 105 is also performed in the surrounding portion 102d1 by positioning thetransfer yoke 105. - An
insertion pipe 106 made of a non-magnetic material is inserted through the through hole 101a1 of the plunger pass-throughside yoke body 101a of theyoke 101 and the throughhole 102a of thebobbin 102. Oneside 106a of theinsertion pipe 106 is extended until a position not coming into contact with thetransfer yoke 105; and theother side 106b of theinsertion pipe 106 forms a receiving seat 106b1 which is extended on the radially outer side from the through hole 101a1 of the plunger pass-throughside yoke body 101a on the outside of the plunger pass-throughside yoke body 101a and receives a release spring 111 (to be described later). Oneside 106a, theother side 106b, and the receiving seat 106b1 are formed in one constitutional body. - An
insertion portion 107a of theplunger 107 is inserted in the inner periphery of theinsertion pipe 106; theplunger 107 moves in a direction of coming into contact with or separating from thetransfer yoke 105 in theinsertion pipe 106; and oneside 107b of theplunger 107 comes into contact with or separates from thetransfer yoke 105. Theother side 107c of theplunger 107, which has a diameter smaller than a diameter of theinsertion portion 107a, is arranged at a position where theinsertion portion 107a of theplunger 107 is located on the outside of the plunger pass-throughside yoke body 101a; and a steppedportion 107d is formed between theinsertion portion 107a of theplunger 107 and theother side 107c of theplunger 107. - A
plate 108 is arranged on the shaft end portion side of theother side 107c of theplunger 107 and is fixed by a fixingsupport body 109. Theplate 108 is pressed by the spring force of aplate spring 110 fitted onto theother side 107c of theplunger 107 between theplate 108 and the steppedportion 107d of theplunger 107 and is fixed to the fixingsupport body 109. - The
release spring 111 is arranged between theplate 108 and the receiving seat 106b1 of theother side 106b of theinsertion pipe 106 on the outer peripheral side of theinsertion portion 107a of theplunger 107, which is located on the outside of the plunger pass-throughside yoke body 101a. Therelease spring 111 is arranged so as to maintain biasing force that separates theplunger 107 from thetransfer yoke 105 when oneside 107b of theplunger 107 comes into contact with thetransfer yoke 105 by the suction force of thepermanent magnet 103. - Next, the operation of the thus configured release type electromagnetic device of the present invention will be described.
Fig. 1 shows a state in which theplunger 107 is arranged at a reset position by the reset operation of a circuit breaker (not shown in the drawing) . At this time, as shown in a magnetic flux path X, magnetic flux of thepermanent magnet 103 returns from an N-pole to an S-pole via thetransfer yoke 105; theplunger 107; theinsertion pipe 106; and the plunger pass-throughside yoke body 101a, the centralside yoke body 101b, and the permanent magnetside yoke body 101c of theyoke 101. If the suction force of thepermanent magnet 103 is set to Fm and the biasing force of therelease spring 111 is set to Fs, theplunger 107 is suctioned to thetransfer yoke 105 by a force of "Fm-Fs." More specifically,Fig. 1 shows the state in which oneside 107b of theplunger 107 comes into contact with thetransfer yoke 105 by the suction force of thepermanent magnet 103 and the magnetic flux circuit X by thepermanent magnet 103 is formed. The suction force of thepermanent magnet 103 is a larger suction force than the biasing force of therelease spring 111 and theplunger 107 is suctioned and retained to thetransfer yoke 105 by the suction force of thepermanent magnet 103. - When the circuit breaker (not shown in the drawing) detects a short circuit and/or earth leakage and the
electromagnetic coil 104 is energized based on a tripping signal, the magnetic flux returns to theplunger 107 via theplunger 107; thetransfer yoke 105; the permanent magnetside yoke body 101c, the centralside yoke body 101b, and the plunger pass-throughside yoke body 101a of theyoke 101; and theinsertion pipe 106, as shown by a magnetic flux circuit Y. As described above, the magnetic flux is generated so as to cancel the suction force of thepermanent magnet 103. Then, when the suction force Fm of thepermanent magnet 103 is smaller than the biasing force Fs of therelease spring 111, theplunger 107 is separated from thetransfer yoke 105 by the biasing force Fs of therelease spring 111 to be protruded and moved to the outer upper side of the plunger pass-throughside yoke body 101a of theyoke 101 on the paper surface ofFig. 1 and a tripping mechanism (not shown in the drawing) trips the circuit. - The release type electromagnetic device in this
Embodiment 1 solves the problem in which, as described in the above conventional release type electromagnetic device, since theyoke 1 is composed of two: themain yoke 1c; and theend part yoke 1d provided with the boss portion 1d2 having the through hole 1d1, the control of magnetic resistance generated in the joint portion between themain yoke 1c and theend part yoke 1d is difficult and the release characteristics are not stable. - The
yoke 101 in thisEmbodiment 1 is configured by bending the single plate into the rectangular shape and is configured by arranging the plunger pass-throughside yoke body 101a which is located on the firstbobbin frame body 102c side of thebobbin 102 and has the through hole 101a1 which is communicated with the throughhole 102a formed in thecentral portion 102b of thebobbin 102 and is formed in the diameter substantially the same diameter as the throughhole 102a, by arranging the centralside yoke bodies 101b each of which is bent from the plunger pass-throughside yoke body 101a to thepermanent magnet 103 side, and by arranging the permanent magnetside yoke bodies 101c each of which is bent from each of the centralside yoke bodies 101b to the center side of the throughhole 102a of thebobbin 102 to come into contact with the permanent magnet and to form theyoke closing portion 101d at both end surfaces 101c1. More specifically, theyoke 101 is configured by bending the single plate into the rectangular shape to form theyoke closing portion 101d at the position of both end surfaces 101c1 of the permanent magnetside yoke bodies 101c that come into contact with thepermanent magnet 103. Thus, a plated film thickness and/or an air gap generated at the aforementioned conventional joint portion is eliminated and magnetic flux fluctuations can be remarkably reduced; and therefore, stable release characteristics can be secured. - Furthermore, the
plunger 107 is not configured in the three-stage diameter of thefirst insertion portion 7b, thesecond insertion portion 7c having the diameter smaller than the diameter of thefirst insertion portion 7b, and theother side 7d having the diameter smaller than the diameter of thesecond insertion portion 7c, as described in the above conventional one; but theplunger 107 is configured in a two-stage diameter of theinsertion portion 107a and theother side 107c and a simple shape can be achieved. - Furthermore, the
insertion pipe 106 is inserted through the through hole 101a1 of the plunger pass-throughside yoke body 101a of theyoke 101 and the throughhole 102a of thebobbin 102. Oneside 106a of theinsertion pipe 106 is extended until the position not coming into contact with thetransfer yoke 105, oneside 106a being not processed at all; and theother side 106b of theinsertion pipe 106 forms a receiving seat 106b1 which is extended on the radially outer side from the through hole 101a1 of the plunger pass-throughside yoke body 101a on the outside of the plunger pass-throughside yoke body 101a and receives arelease spring 111. Oneside 106a, theother side 106b, and the receiving seat 106b1 are formed in one constitutional body. Therefore, theinsertion pipe 106 is not one which is composed of two pipes: thefirst insertion pipe 6 inserted into the throughhole 5b of thebobbin 5; and thesecond insertion pipe 8 fitted onto the outer peripheral surface of thesecond insertion portion 7c of theplunger 7, as described in the above conventional one. Then, theinsertion pipe 106 is not a complicated shape having the structure in which oneside 6a of thefirst insertion pipe 6 is bent to the radially outer side to be brought into engagement with the cutout portion 5e formed in the secondbobbin frame body 5d of thebobbin 5 and thefirst insertion pipe 6 is not slipped out from thebobbin 5. However, theinsertion pipe 106 can be formed in one constitutional body having the simple structure; and therefore, the number of components can be reduced to achieve simple assembly. - Moreover, the
insertion pipe 106 is inserted through the through hole 101a1 of the plunger pass-throughside yoke body 101a of theyoke 101 and the throughhole 102a of thebobbin 102; and thus, positional deviations of theyoke 101 and thebobbin 102 can be suppressed. - Additionally, the
insertion pipe 106 is made of the non-magnetic material and secures a magnetic gap between theyoke 101 and theplunger 107; and therefore, theinsertion pipe 106 has function as a plunger guide. - In addition, as for fixing the
insertion pipe 106, theother side 106b of theinsertion pipe 106 is provided with the receiving seat 106b1, which is extended on the radially outer side from the through hole 101a1 of the plunger pass-throughside yoke body 101a on the outside of the plunger pass-throughside yoke body 101a and receives therelease spring 111. Then, the position of theinsertion pipe 106 is set by being pressed to the plunger pass-throughside yoke body 101a of theyoke 101 by the biasing force of therelease spring 111; and therefore, work such as adhesion is not required and simplification of assembly work can be achieved. - As described above, the number of components can be reduced to achieve a simple shape; and therefore, much trouble and labor are not required for such assembly work, simple assembly work can be performed, and assembly work can be performed simply and in a short time.
- Besides, as for the positioning of the
permanent magnet 103 and thetransfer yoke 105, the surrounding portion 102d1 extended with the slight gap against the permanent magnetside yoke bodies 101c is provided in the secondbobbin frame body 102d of thebobbin 102 and thetransfer yoke 105 made of the magnetic material and thepermanent magnet 103 positioned on thetransfer yoke 105 are merely contained in the surrounding portion 102d1, whereby the positioning can be stably and reliably performed. - Next, the procedure for assembling the release type electromagnetic device in the
aforementioned Embodiment 1 will be described.Fig. 2 shows the exploded development perspective view of the entire release type electromagnetic device.Fig. 3 is the perspective view showing theyoke 101 inEmbodiment 1. Theyoke 101 is configured by bending the single plate into the rectangular shape; and theyoke 101 is composed of the plunger pass-throughside yoke body 101a having the through hole 101a1, the centralside yoke bodies 101b each of which is bent from the plunger pass-throughside yoke body 101a to thepermanent magnet 103 side, and the permanent magnetside yoke bodies 101c each of which is bent to the center side to come into contact with the permanent magnet and to form theyoke closing portion 101d at both end surfaces 101c1. - As described above, since the
yoke 101 is formed by bending the single plate into the rectangular shape, the number of components can be reduced, magnetic resistance does not exist because of no joint portion, and the release characteristics can be stabilized; as compared to one which is composed of themain yoke 1c having the openingend 1b bent from the bottom side yoke body 1a and theend part yoke 1d that blocks the openingend 1b of themain yoke 1c, as described in the above conventional one. - First, as shown in
Fig. 5 , theelectromagnetic coil 104 is mounted on the outer peripheral surface of thecentral portion 102b between the firstbobbin frame body 102c of thebobbin 102 and the secondbobbin frame body 102d of thebobbin 102. As shown inFig. 6 , thetransfer yoke 105 is contained in the surrounding portion 102d1 to perform positioning of thetransfer yoke 105, the surrounding portion 102d1 being provided in the secondbobbin frame body 102d of thebobbin 102 on which theelectromagnetic coil 104 is mounted; and thepermanent magnet 103 is attached to an concaved portion of thetransfer yoke 105 to perform positioning. Thetransfer yoke 105 and thepermanent magnet 103 are merely contained in the surrounding portion 102d1 provided in the secondbobbin frame body 102d of thebobbin 102, whereby the positioning can be stably, reliably, and simply performed. Furthermore, thetransfer yoke 105 is retained in the surrounding portion 102d1 of the secondbobbin frame body 102d of thebobbin 102 by mountingscrews 112. - As described above, the surrounding portion 102d1 in which the whole of the
transfer yoke 105 and thepermanent magnet 103 are contained is provided in the secondbobbin frame body 102d of thebobbin 102, whereby the positioning of thetransfer yoke 105 and thepermanent magnet 103 can be stably, simply, and reliably performed. Furthermore, the cutout portion 5e which is described in the above conventional one, is not formed on the throughhole 102a side of the secondbobbin frame body 102d of thebobbin 102, thereby providing a simple structure. - Next, as shown in
Fig. 7 andFig. 8 , an assembly body in which thetransfer yoke 105 and thepermanent magnet 103 are contained in the surrounding portion 102d1 provided in the secondbobbin frame body 102d of thebobbin 102 is inserted into a space of theyoke 101 from an opening portion of theyoke 101 until a position where the throughhole 102a of thebobbin 102 corresponds to the through hole 101a1 of the plunger pass-throughside yoke body 101a of theyoke 101. - As described above, the cutout portion 5e which is described in the above conventional one, is not formed on the through
hole 102a side of the secondbobbin frame body 102d of thebobbin 102. Therefore, such a configuration is not the complicated shape in which oneside 6a of thefirst insertion pipe 6 is bent on the radially outer side to be brought into engagement with the cutout portion 5e formed in the secondbobbin frame body 5d of thebobbin 5 and thefirst insertion pipe 6 is not slipped out from thebobbin 5 as described in the above conventional one; but the configuration is a significantly simple structure and assembling performance is also simple. - Further, as shown in
Fig. 9 andFig. 10 , theinsertion pipe 106 is sequentially inserted into the through hole 101a1 of the plunger pass-throughside yoke body 101a of theyoke 101 and the throughhole 102a of thebobbin 102 from oneside 106a of theinsertion pipe 106 from the outside of the plunger pass-throughside yoke body 101a of theyoke 101, so that theother side 106b extended to the radially outer side of theinsertion pipe 106 is brought into contact with the plunger pass-throughside yoke body 101a of theyoke 101. - As described above, since one
insertion pipe 106 is merely inserted into the through hole 101a1 of the plunger pass-throughside yoke body 101a of theyoke 101 and the throughhole 102a of thebobbin 102 from oneside 106a of theinsertion pipe 106 until theother side 106b of theinsertion pipe 106 comes into contact with the plunger pass-throughside yoke body 101a of theyoke 101, the number of components can be reduced and simple configuration can be provided; as compared to one which is composed of two pipes: thefirst insertion pipe 6 inserted into the throughhole 5b of thebobbin 5; and thesecond insertion pipe 8 fitted onto the outer peripheral surface of thesecond insertion portion 7c of theplunger 7, as described in the above conventional one. - Furthermore, in this
Embodiment 1, since oneinsertion pipe 106 is merely inserted until theother side 106b of theinsertion pipe 106 comes into contact with the plunger pass-throughside yoke body 101a of theyoke 101, significantly simple insertion work can be achieved; as compared to one which is complicated in structure in which thefirst insertion pipe 6 is fixed by being inserted through the throughhole 5b of thebobbin 5 and fitting of thesecond insertion pipe 8 onto the outer peripheral surface of thesecond insertion portion 7c of theplunger 7 is also complicated, as described in the above conventional one. Incidentally, oneside 106a of theinsertion pipe 106 is not bent to the radially outer side as described in the above conventional one, but oneside 106a merely faces thetransfer yoke 105 with a predetermined distance and any processing is not applied, thereby providing simple structure. - Then, as shown from
Fig. 11 to Fig. 14 , theplate spring 110 is fitted onto theother side 107c of theplunger 107; an end portion of theother side 107c of theplunger 107 is inserted through the through hole 108a of theplate 108; therelease spring 111 is fitted onto theplunger 107 after fixing theplate 108 and theplate spring 110 to theplunger 107 by the fixingsupport body 109; and theplunger 107 is inserted through theinsertion pipe 106 from oneside 107b of theplunger 107 until theinsertion portion 107a of theplunger 107 is inserted in theinsertion pipe 106, whereby therelease spring 111 is arranged so as to have a predetermined biasing force between the receiving seat 106b1 that is theother side 106b of theinsertion pipe 106 and theplate 108. - As described above, the
plunger 107 is configured in the two-stage diameter of theinsertion portion 107a and theother side 107c and the simple shape is achieved. Theplunger 107 is not one in which theplunger 7 is configured in the three-stage diameter of thefirst insertion portion 7b, thesecond insertion portion 7c having the diameter smaller than the diameter of thefirst insertion portion 7b, and theother side 7d having the diameter smaller than the diameter of thesecond insertion portion 7c as described in the above conventional one. In addition, there are not provided thesecond insertion portion 7c and thesecond insertion pipe 8 provided on thesecond insertion portion 7c, which are described in the above conventional one; and therefore, significantly simplified structure can be provided. - Incidentally, magnetization to the
permanent magnet 103 is performed either in the state of the assembly body shown inFig. 10 or the state of the assembly body shown inFig. 14 ; and theplunger 107 is suctioned and retained to thetransfer yoke 105 by the suction force of thepermanent magnet 103. - As described above, the configuration of respective components of the release type electromagnetic device is simplified and the number of components is reduced, whereby much trouble and labor are not required for such an assembly work, simple assembly work can be performed, and assembly work can be performed simply and in a short time.
-
Embodiment 2 of the present invention will be described with reference toFig. 15. Fig. 15 is a perspective view showing a yoke in a release type electromagnetic device according toEmbodiment 2 of the present invention. - In the
aforementioned Embodiment 1, the description has been made on the case where theyoke closing portion 101d formed at the position of both end surfaces 101c1 of the permanent magnetside yoke bodies 101c of theyoke 101 are provided in the direction orthogonal to the axial direction of theplunger 107, for example, provided linearly. However, thisEmbodiment 2 is configured such that ayoke closing portion 101e formed at the position of both end surfaces 101c1 of permanent magnetside yoke bodies 101c of ayoke 101 are provided with concavity and convexity which are engaged with each other. - In this
Embodiment 2, theyoke closing portion 101e of theyoke 101 is configured such that a triangle-shaped convex portion and a triangle-shaped concave portion are engaged with each other, and magnetic characteristics can be more improved than theaforementioned Embodiment 1. -
Embodiment 3 of the present invention will be described with reference toFig. 16. Fig. 16 is a perspective view showing a release type electromagnetic device according toEmbodiment 3 of the present invention. - In the
aforementioned Embodiment 2, the description has been made on the case where theyoke closing portion 101e of theyoke 101 is provided with the triangle-shaped convex portion and the triangle-shaped concave portion which are engaged with each other. However, in thisEmbodiment 3, ayoke closing portion 101f of ayoke 101 is provided with a quadrangle-shaped convex portion and a quadrangle-shaped concave portion which are engaged with each other and the same effect as theaforementioned Embodiment 2 can be exhibited. -
Embodiment 4 of the present invention will be described with reference toFig. 17. Fig. 17 is a perspective view showing a yoke in a release type electromagnetic device according toEmbodiment 4 of the present invention. - In the
aforementioned Embodiment 1, the description has been made on the case where theyoke closing portion 101d formed at the position of both end surfaces 101c1 of the permanent magnetside yoke bodies 101c of theyoke 101 is provided in the direction orthogonal to the axial direction of theplunger 107, for example, provided linearly. However, theyoke 101 formed in such a rectangular shape is easy to be deflected and deformed if external force is applied after forming; and accordingly, theyoke closing portion 101d of theyoke 101 is opened and possibility of influence on magnetic characteristics is generated. Theyoke closing portion 101e of theyoke 101 in theaforementioned Embodiment 2 is provided with the triangle-shaped convex portion and the triangle-shaped concave portion which are engaged with each other; and theyoke closing portion 101f of theyoke 101 in theaforementioned Embodiment 3 is provided with the quadrangle-shaped convex portion and the quadrangle-shaped concave portion which are engaged with each other. Even if thoseyoke closing portions - However, in this
Embodiment 4, the shape of ayoke closing portion 101g of ayoke 101 is brought into concavo-convex engagement in an intricate shape, thereby providing structure in which theyoke closing portion 101g of theyoke 101 is not deformed and opened. More specifically, in the concavo-convex engagement, the size of a convex end portion is larger than the size of a convex base portion in both end surfaces 101c1 of permanent magnetside yoke bodies 101c of theyoke 101; and the size of a concave end portion is smaller than the size of a concave base portion in both end surfaces 101c1. In the concavo-convex engagement of theyoke closing portion 101g of theyoke 101, the convex end portion is engaged with the concave base portion; and the convex base portion is engaged with the concave end portions. Since both end surfaces 101c1 are configured in this way, the permanent magnetside yoke bodies 101c of theyoke 101 are bent to be brought into concavo-convex engagement of theyoke closing portion 101g of theyoke 101, whereby theyoke closing portion 101g of theyoke 101 can be prevented from being opened and any influence is not exerted on magnetic characteristics. - As described above, the yoke is configured by bending the single plate into the rectangular shape to form the yoke closing portion at the position of both end surfaces of the permanent magnet side yoke bodies that come into contact with the permanent magnet. However, the yoke closing portions of the yoke are not limited to the aforementioned respective embodiments and the shape of other yoke closing portions can be provided.
- Incidentally, the present invention can freely combine the respective embodiments and appropriately modify and/or omit the respective embodiments, within the scope of the present invention as defined in the appended claims.
- The present invention is suitable for achieving a release type electromagnetic device capable of obtaining stable release characteristics.
Claims (7)
- A release type electromagnetic device comprising:a bobbin (102) in which a through hole (102a) is provided in a central portion (102b), and an electromagnetic coil (104) is mounted on the outer peripheral surface of the central portion (102b) between a first bobbin frame body (102c) and a second bobbin frame body (102d);a transfer yoke (105) arranged on the second bobbin frame body (102d) side of said bobbin (102);a permanent magnet (103) arranged on said transfer yoke (105);a yoke (101) in which said bobbin (102), said electromagnetic coil (104), said transfer yoke (105), and said permanent magnet (103) are contained in an inner space;an insertion pipe (106) inserted in the through hole (102a) of said bobbin (102);a plunger (107) which is inserted in the inner periphery of said insertion pipe (106), and moves in a direction of coming into contact with or separating from said transfer yoke (105); anda release spring (111) which biases said plunger (107) in the direction of separating from said transfer yoke (105),said plunger (107) being retained at a position coming into contact with said transfer yoke (105) by the suction force of said permanent magnet (103), and being released in the direction of separating from said transfer yoke (105) by the biasing force of said release spring (111) when said electromagnetic coil (104) is energized to reduce the suction force of said permanent magnet (103),wherein said yoke (101) includes: a plunger pass-through side yoke body (101a) which is located on the first bobbin frame body (102c) side of said bobbin (102) and has a through hole (101a1) communicated with the through hole (102a) of said bobbin (102), central side yoke bodies (101b) each of which is bent from said plunger pass-through side yoke body (101a) to the permanent magnet (103) side, and permanent magnet side yoke bodies (101c) each of which is bent from each of said central side yoke bodies (101b) to the center side of the through hole (102a) of said bobbin (102) to come into contact with said permanent magnet (103) and to form a yoke closing portion (101d) at respective end surfaces (101c1) of said permanent magnet side yoke bodies (101c), andwherein one side of said insertion pipe (106) faces said transfer yoke (105) with a predetermined distance.
- The release type electromagnetic device according to claim 1,
wherein said yoke (101) is configured by bending a single plate into a rectangular shape to form the yoke closing portion (101d) that comes into contact with said permanent magnet (103) at the position of both end surfaces of said permanent magnet side yoke bodies (101c). - The release type electromagnetic device according to claim 1,
wherein said insertion pipe (106) is inserted in the through hole (101a1) of said plunger pass-through side yoke body (101a) and the through hole (102a) of said bobbin (102), one side thereof is extended to the transfer yoke (105) side, and the other side thereof forms a receiving seat (106b1) which is extended to the radially outer side from the through hole (101a1) of said plunger pass-through side yoke body (101a) on the outside of said plunger pass-through side yoke body (101a). - The release type electromagnetic device according to any one of claim 1 to claim 3,
wherein said insertion pipe (106) is inserted in the through hole (101a1) of said plunger pass-through side yoke body (101a) and the through hole (102a) of said bobbin (102) from the outer side of said plunger pass-through side yoke body (101a) to provide structure that corrects deviations of said yoke (101) and said bobbin (102). - The release type electromagnetic device according to claim 3 or claim 4,
wherein said release spring (111) is retained in said receiving seat (106b1) on the other side of said insertion pipe (106). - The release type electromagnetic device according to claim 1 or claim 2,
wherein said yoke closing portion (101d) located at both end surfaces of said permanent magnet side yoke bodies (101c) of said yoke (101) includes concavity and convexity which are engaged with each other. - A method of manufacturing a release type electromagnetic device, the method comprising the steps of:mounting an electromagnetic coil (104) on the outer peripheral surface of a central portion between a first bobbin frame body (102c) and a second bobbin frame body (102d) of a bobbin (1023) provided with a through hole (102a) in the central portion (102b);containing a transfer yoke (105) and a permanent magnet (103) in a surrounding portion provided in said second bobbin frame body (102d) of said bobbin (102);inserting an assembly body containing said transfer yoke (105) and said permanent magnet (103) in the surrounding portion of said second bobbin frame body (102d) of said bobbin (102) into a yoke (101) configured by arranging a plunger pass-through side yoke body (101a) which is located on the first bobbin frame body (102c) side of said bobbin (102) and has a through hole (101a1) communicated with the through hole (102a) of said bobbin (102), by arranging central side yoke bodies (101b) each of which is bent from said plunger pass-through side yoke body (101a) to the permanent magnet (103) side, and by arranging permanent magnet side yoke bodies (101c) each of which is bent from each of said central side yoke bodies (101b) to the center side of the through hole (102a) of said bobbin (102) to come into contact with said permanent magnet (103) and to form a yoke closing portion (101d) at respective end surfaces(101c1) of said permanent magnet side yoke bodies (101c);inserting an insertion pipe (106) from one side of said insertion pipe (106) into the through hole (101a1) of said plunger pass-through side yoke body (101a) of said yoke (101) and the through hole (102a) of said bobbin (102) with one side of said insertion pipe (106) facing said transfer yoke (105) with a predetermined distance until the other side of said insertion pipe (106) comes into contact with said plunger pass-through side yoke body (101a) of said yoke (101); andarranging a release spring (111) so as to have a predetermined biasing force between the other side of said insertion pipe (106) and a plate (108) by fitting a plate spring (110) onto the other side of said plunger (107), inserting an end portion of the other side of said plunger (107) through a through hole of said plate (108), fitting said release spring (111) onto said plunger (107) after fixing said plate (108) and said plate spring (110) to said plunger (107) by a fixing support body (109), and inserting said plunger (107) from one side of said plunger (107) through said insertion pipe (106) until a pass-through portion (107a) of said plunger (107) is inserted in said insertion pipe (106).
Applications Claiming Priority (1)
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PCT/JP2014/059858 WO2015151259A1 (en) | 2014-04-03 | 2014-04-03 | Release-type electromagnet device and production method therefor |
Publications (3)
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EP3128523A1 EP3128523A1 (en) | 2017-02-08 |
EP3128523A4 EP3128523A4 (en) | 2018-01-31 |
EP3128523B1 true EP3128523B1 (en) | 2021-05-26 |
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EP14888541.1A Active EP3128523B1 (en) | 2014-04-03 | 2014-04-03 | Release-type electromagnet device and production method therefor |
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EP (1) | EP3128523B1 (en) |
JP (1) | JP6138349B2 (en) |
KR (1) | KR101838422B1 (en) |
CN (2) | CN204441227U (en) |
TW (1) | TWI533348B (en) |
WO (1) | WO2015151259A1 (en) |
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WO2015151259A1 (en) * | 2014-04-03 | 2015-10-08 | 三菱電機株式会社 | Release-type electromagnet device and production method therefor |
CN105523157B (en) * | 2015-12-25 | 2018-02-23 | 河北工业大学 | A kind of underwater robot, which is thrown, carries module |
WO2017180589A1 (en) | 2016-04-11 | 2017-10-19 | Auspex Pharmaceuticals, Inc. | Deuterated ketamine derivatives |
CN107275164A (en) * | 2017-08-02 | 2017-10-20 | 厦门安普格电气有限公司 | Energy-efficient magnetic keeps electrical apparatus release |
FR3084772B1 (en) * | 2018-08-01 | 2021-06-18 | Schneider Electric Ind Sas | ELECTROMAGNETIC ACTUATOR AND ELECTRICAL SWITCHING APPARATUS INCLUDING THIS ACTUATOR |
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JPS5327306Y2 (en) * | 1972-07-21 | 1978-07-11 | ||
JPS596503A (en) * | 1982-07-02 | 1984-01-13 | Sumitomo Special Metals Co Ltd | Self-holding type solenoid |
DE3445917A1 (en) * | 1984-12-17 | 1986-06-19 | Harting Elektronik Gmbh, 4992 Espelkamp | LIFT MAGNET |
JPS6437004U (en) * | 1987-08-28 | 1989-03-06 | ||
DE8900779U1 (en) * | 1989-01-25 | 1989-05-11 | Walloschke, Rudolf, 4972 Loehne, De | |
IT1249286B (en) * | 1990-07-30 | 1995-02-22 | Bticino Spa | PERMANENT MAGNET RELEASE ELECTROMAGNET FOR AUTOMATIC SWITCHES |
JPH05248982A (en) | 1992-03-10 | 1993-09-28 | Nkk Corp | Heat medium leak sensing method for heat medium transport piping |
JPH06203725A (en) * | 1992-12-28 | 1994-07-22 | Matsushita Electric Works Ltd | Sealed contact device |
US5892194A (en) * | 1996-03-26 | 1999-04-06 | Matsushita Electric Works, Ltd. | Sealed contact device with contact gap adjustment capability |
JP2004347077A (en) * | 2003-05-26 | 2004-12-09 | Hitachi Unisia Automotive Ltd | Solenoid valve unit |
JP4910663B2 (en) * | 2006-02-27 | 2012-04-04 | 富士電機機器制御株式会社 | Release electromagnetic device |
JP5248982B2 (en) * | 2008-10-29 | 2013-07-31 | 三菱電機株式会社 | Release-type electromagnet device |
DE102008057738B4 (en) * | 2008-11-17 | 2011-06-16 | Kendrion Magnettechnik Gmbh | Electromagnet with adjustable bypass air gap |
JP5419204B2 (en) * | 2009-03-19 | 2014-02-19 | アイシン・エィ・ダブリュ工業株式会社 | Linear solenoid outer yoke and method of attaching outer yoke |
CN102473561A (en) * | 2009-09-18 | 2012-05-23 | 三菱电机株式会社 | Releasing type electromagnet device |
WO2015151259A1 (en) * | 2014-04-03 | 2015-10-08 | 三菱電機株式会社 | Release-type electromagnet device and production method therefor |
-
2014
- 2014-04-03 WO PCT/JP2014/059858 patent/WO2015151259A1/en active Application Filing
- 2014-04-03 JP JP2016511272A patent/JP6138349B2/en active Active
- 2014-04-03 EP EP14888541.1A patent/EP3128523B1/en active Active
- 2014-04-03 KR KR1020167018038A patent/KR101838422B1/en active IP Right Grant
- 2014-07-11 TW TW103123901A patent/TWI533348B/en active
- 2014-07-15 CN CN201420390850.2U patent/CN204441227U/en not_active Expired - Fee Related
- 2014-07-15 CN CN201410336121.3A patent/CN104979143B/en active Active
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TWI533348B (en) | 2016-05-11 |
EP3128523A4 (en) | 2018-01-31 |
KR101838422B1 (en) | 2018-03-13 |
WO2015151259A1 (en) | 2015-10-08 |
CN104979143B (en) | 2018-08-24 |
KR20160095092A (en) | 2016-08-10 |
CN104979143A (en) | 2015-10-14 |
TW201539512A (en) | 2015-10-16 |
JPWO2015151259A1 (en) | 2017-04-13 |
CN204441227U (en) | 2015-07-01 |
EP3128523A1 (en) | 2017-02-08 |
JP6138349B2 (en) | 2017-05-31 |
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