JP2003007528A - Electromagnetic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a movable iron core from falling during operation and obtain long-lasting stable dynamic characteristic of the movable iron core. SOLUTION: Movable iron cores 13 are arranged opposite to each other in a fixed iron core 12. A guide hole 1 is made at the center of a flat part 12C in a truncated cone-like projection 12D of the fixed iron core 12. A magnet killer M is comprised of a flat plate 2A that is arranged on the flat part 13D of a truncated cone-like concave 13A of the movable iron core 13, and a guide bar 2B projecting from the flat plate 2A. The guide bar 2B of the movable iron core 13 is centered and supported within the guide hole 1, thereby preventing the movable iron core 13 from falling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a fixed iron core fixedly arranged in an electromagnetic coil, and a movable iron core is movably arranged so as to face the fixed iron core. The present invention relates to an electromagnetic device that is attracted and moved. Of these, a magnetic sticking prevention member (magnet killer) due to the magnetic attraction force remaining between the attracting surfaces of the fixed iron core and the movable iron core when the energization of the electromagnetic coil is stopped. Regarding

[0002]

2. Description of the Related Art A conventional electromagnetic device is shown in FIG. 10
Is a coil bobbin made of a synthetic resin material in which a guide cylinder 10A is formed at the center thereof and laterally extending flanges 10B and 10C are formed at the upper and lower ends thereof, and the electromagnetic coil D is provided on the outer periphery of the guide cylinder 10A. Are stacked and wound and arranged. A lead wire for power feeding extends from the electromagnetic coil D toward the outside. Reference numeral 11 denotes a housing which is made of a magnetic material and includes a cylindrical portion 11A which surrounds the outer circumference of the electromagnetic coil 11 and magnetic pole disks 11B and 11C which are arranged to face the flange portions 10B and 10C. Reference numeral 12 denotes a fixed iron core made of a magnetic material that is fixed by being inserted into the guide cylinder 10A from an opening below the guide cylinder 10A of the coil bobbin 10, and has a conical surface 12B and a conical surface 12B that extend further upward from its upper end 12A. A flat portion 12C formed at the upper end of the and a truncated cone-shaped protrusion 12D formed by the protrusion are formed. 13 is a guide cylinder 10 of the coil bobbin 10.
The movable iron core 13 is a movable iron core made of a magnetic material, which is arranged in A so as to face the fixed iron core 12 and is movable.
A conical recess 13 </ b> A into which the conical projection 12 </ b> D of the fixed iron core 12 can enter is provided at the end facing the stationary core 12. That is, the conical recess 13A
A conical surface 13B having a shape that conforms to the conical surface 12B of the truncated cone-shaped projection 12D is formed on the outer peripheral surface of the conical surface 13B. Reference numeral 14 is a magnet killer (hereinafter simply referred to as a magnet killer) as a magnetic sticking prevention member for the movable iron core 13 and the fixed iron core 12, and is made of a non-magnetic material. The magnet killer 14 has a thin plate shape made of a non-magnetic material, and has an upper end 1 of the fixed iron core 12 below.
2A, an annular plate portion 14A, a conical cylindrical portion 14B extending upward from the inner end of the annular plate portion 14A along the conical surface 12B of the truncated cone-shaped protrusion 12D, and an upper end of the conical cylindrical portion 14B. The annular plate portion 14C that is in contact with the flat portion 12C of the fixed iron core 12 is integrally formed. The magnet killer 14 has a substantially cap shape, and the magnet killer 14 is disposed in contact with the truncated cone-shaped projection 12D of the fixed iron core 12. That is, the annular plate portion 14A of the magnet killer 14 is disposed in contact with the upper end 12A of the fixed iron core 12,
The conical cylindrical portion 14B is a conical surface 12B of a truncated cone-shaped protrusion 12D.
And the annular plate portion 14C is disposed in contact with the
It is disposed in contact with the flat portion 12C of D. Incidentally, S is a spring which is arranged between the fixed iron core 12 and the movable iron core 13 and serves to separate the movable iron core 13 from the fixed iron core 12.
According to such a conventional electromagnetic device, when the electromagnetic coil 11 is energized and a magnetic attraction force acts between the fixed iron core 12 and the movable iron core 13, the movable iron core 13 is attracted to the fixed iron core 12 against the spring force of the spring S. The first position is maintained. or,
When the power supply to the electromagnetic coil 11 is cut off, the magnetic attraction force between the movable iron core 13 and the fixed iron core 12 decreases, and the movable iron core 1
3 is separated from the fixed iron core 12 by the spring force of the spring S. Then, the magnetic attraction force remaining between the frustoconical recess 13A of the movable iron core 13 and the frustoconical protrusion 12D of the fixed iron core 12 is applied to the magnet killer 14 made of a non-magnetic material disposed between them. The movable iron core 13 is separated from the fixed iron core 12 without any trouble.

[0003]

According to such a conventional electromagnetic device, the movable iron core 13 is movably guided by the guide cylinder 10A of the coil bobbin 10, and the movable iron core 13 does not fall when the movable iron core 13 moves. There is no control. According to this, the movable iron core 13 and the guide cylinder 10A are eccentrically contacted with each other during use over a long period of time, which may cause abrasion at the contact portion, which is not preferable. On the other hand, the movable iron core 1 is improved by improving the accuracy of the clearance between the movable iron core 13 and the guide cylinder 10A.
It is possible to prevent the fall of No. 3, but this is not preferable because the cost for maintaining accuracy increases. Furthermore, the movable iron core 13 is configured such that, when the movable iron core 13 is energized, the conical surface 13B of the truncated cone-shaped concave portion abuts against the conical cylindrical portion 14B of the magnet killer 14, and at this time, the abutting sound leaks to the outside, Especially when used indoors, it becomes a problem. The electromagnetic device according to the present invention has been made in view of such a problem, and it is an object of the present invention to provide an electromagnetic device that can prevent the movable core from collapsing during operation and can obtain stable dynamic characteristics for a long period of time. And it aims at providing the said device with high quietness.

[0004]

In order to achieve the above object of the electromagnetic device according to the present invention, an electromagnetic coil wound in an annular shape, a fixed iron core fixedly arranged in the electromagnetic coil, and an opposed arrangement to the fixed iron core. And a movable core that is attracted to and separated from the fixed core, and a truncated cone-shaped projection is formed at the end of the fixed core on the side of the movable core, and the end of the movable core on the side of the fixed core. In the electromagnetic device in which a truncated cone-shaped recess into which the truncated cone-shaped protrusion is inserted is formed, the center of the flat portion of the truncated cone-shaped protrusion of the fixed iron core in the longitudinal axis direction. A guide hole is formed along the flat core part of the movable iron core, and the flat part of the frustoconical concave part of the movable iron core facing the flat part of the frustoconical protrusion part made of a non-magnetic material, and the fixed core from the flat plate part. The guide rod that is inserted and supported in the guide hole when protruding toward the side is integrated. A magnet killer provided arranged,
The first feature is that the guide rod of the movable iron core is slidably centered and supported by the guide hole of the fixed iron core.

Further, according to the present invention, an electromagnetic coil wound in an annular shape, a fixed iron core fixedly arranged in the electromagnetic coil, a movable iron which is arranged so as to face the fixed iron core and is attracted and separated from the fixed iron core. An iron core is provided, and a truncated cone-shaped projection is formed at the end of the fixed iron core on the movable iron core side, and the truncated cone-shaped projection is inserted and arranged at the end of the movable iron core on the fixed iron core side. In an electromagnetic device in which a truncated cone-shaped recess is bored,
At the center of the flat portion of the truncated cone-shaped projection of the fixed iron core, a guide rod is provided which extends along the longitudinal axis direction and projects from the flat portion, while the flat portion of the truncated cone-shaped recess of the movable iron core is not A flat plate part that is made of a magnetic material and faces the flat part of the truncated cone-shaped projection, and a magnet killer that has a guide hole in the center of the flat plate part that extends along the longitudinal axis direction are arranged. The second feature is that the rod is slidably centered and supported by the guide hole of the movable iron core.

According to the present invention, in addition to the first or second feature, the guide rod is inserted into the guide hole only at the final stage of the movement of the movable iron core toward the fixed iron core to support the centering. It is characterized by 3.

Further, in addition to the first feature, the present invention has a fourth feature in that a magnet killer including a flat plate portion and a guide rod is integrally formed with an output rod made of a non-magnetic material and extending outward from the movable iron core. To do.

Furthermore, in addition to the above-mentioned second characteristic, the present invention is characterized in that a magnet killer consisting of a flat plate portion and a guide hole is integrally formed with an output rod made of a non-magnetic material which extends from the movable iron core to the outside. It is a feature of.

[0009]

According to the first feature of the electromagnetic device of the present invention, when the movable iron core is attracted to the fixed iron core, the guide rod of the movable iron core is centered and supported in the guide hole of the fixed iron core, so that The coil bobbin can be effectively prevented from falling in the guide tube, and the role of a magnet killer can be reliably ensured between the conical surface of the truncated cone-shaped projection of the movable iron core and the conical surface of the truncated cone-shaped recessed portion of the movable iron core. You can form a void
Furthermore, uneven wear between the movable iron core and the guide cylinder can be suppressed.

According to a second feature of the electromagnetic device of the present invention,
When the movable iron core is attracted to the fixed iron core, the guide rod of the fixed iron core is centered and supported in the guide hole of the movable iron core, so that the coil bobbin of the movable iron core can be effectively prevented from falling in the guide tube, and the movable iron core can be effectively prevented. It is possible to reliably form a gap functioning as a magnet killer between the conical surface of the truncated cone-shaped projection of the movable iron core and the conical surface of the truncated conical recess of the movable iron core. It is possible to suppress uneven wear between the two.

Further, according to the third feature of the present invention, the depth of the guide hole can be made shallow, whereby the reduction of the magnetic path area can be suppressed and a sufficient magnetic force can be maintained.

Further, according to the third and fourth features of the present invention, since the magnet killer is formed integrally with the output rod made of a non-magnetic material, a magnet killer is separately prepared and used as a movable iron core. No need to attach.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electromagnetic device of the present invention will be described below with reference to FIG. The same reference numerals are used for the same structural parts as in FIG. 6, and the description thereof will be omitted. Reference numeral 1 is a guide hole formed downward from the center of the flat portion 12C above the truncated cone-shaped projection 12D of the fixed iron core 12. M is a magnet killer made of a non-magnetic material, and consists of the following. Two
A is a flat part 13 of a conical recess 13A of the movable iron core 13.
It is a flat plate portion that is arranged at D and faces the flat portion 12C of the fixed iron core 12, and a guide rod 2B that projects toward the lower fixed iron core 12 is integrally formed on the lower surface of the flat plate portion 2A. This guide rod 2B is inserted and arranged in the guide hole 1 formed in the fixed iron core 12, whereby the movable iron core 13 is centered and supported with respect to the fixed iron core 12.

In a state where no current is supplied to the electromagnetic coil D, the movable iron core 13 is pulled upward by the spring force of the spring S, and the movable iron core 13 maintains the first state in which it is separated from the fixed iron core 12. In this state, the guide rod 2B formed integrally with the movable iron core 13 is centered and supported by the guide hole 1 of the fixed iron core 12.

Then, when the electromagnetic coil D is energized, a magnetic attraction force is generated between the movable iron core 13 and the fixed iron core 12, whereby the movable iron core 13 resists the spring force of the spring S. It is sucked and moved to the 12 side,
At this time, the flat plate portion 2A of the magnet killer M is fixed to the fixed core 1
The second state is maintained in which the upper flat portion 12C of 2 is in contact with the second flat portion 12C. This second state is enlarged and shown in FIG. 2, and the movable iron core 13 is restricted and held in the guide hole 1 within a range in which the guide rod 2B is tilted. Particularly noticeable here is the movable iron core 13
The fixed iron core 1
That is, the second conical surface 12B and the conical surface 13B of the movable iron core 13 do not come into contact with each other and a gap is present. In this example, A is set in the clockwise direction with respect to the longitudinal axis of the fixed iron core 12.
Although the space B on the right side is smaller than the space C on the left side according to this, the cones 12B and 13B do not contact with each other even in the small space B.

According to the above, the movable iron core 13 is separated from the fixed iron core 12 without delay in the state where the current supply to the electromagnetic coil D is stopped from the energized state of the electromagnetic coil D. This is because the gap serving as the magnet killer M is formed between the movable iron core 13 and the fixed iron core 12. Further, according to the present invention, since the fall of the movable core 13 is suppressed, the contact between the outer periphery of the movable core 13 and the guide cylinder 10A of the coil bobbin 10 is lost, or even if they make contact, the contact pressure is extremely high. Since it is small, it is possible to reduce the contact frictional force between the movable core 13 and the guide cylinder 10A, reduce the wear at the contact portion, and obtain stable dynamic characteristics of the movable core 13 for a long period of time.

FIG. 3 shows another embodiment of the electromagnetic device of the present invention. The same reference numerals are used for the same structural parts as in FIG. 1, and only different parts will be described. Reference numeral 4 denotes an output rod that takes out the movement of the movable iron core 13 toward the outside. The output rod 4 is made of a non-magnetic material and the movable iron core 1
3, the flat portion 4A corresponding to the flat plate shape 2A of the magnet killer M in the first embodiment and the guide rod 4B projecting from the flat portion 4A are integrally formed at the tip end thereof. The guide hole 1 formed at the center of the fixed iron core 12 is shallower than the first embodiment, and the movable iron core 13 is fixed at the hole depth of the guide hole 1. The guide rod 4B was set to enter the guide hole 1 for the first time at the final stage of the movement of contacting the core 12.
The final stage of this movement may be set appropriately, but may be about 1/3 of the total stroke of the movable iron core 13, for example.

According to such a second embodiment, the guide hole 1
By making the hole depth shallower, it is possible to prevent the magnetic path area of the fixed iron core 12 from being reduced and to secure a sufficient magnetic force.
Further, because the magnet killer M is integrally formed on the output rod 4, the magnet killer M and the output rod 4 can be shared by a single member, and the attachment of the output rod 4 to the movable iron core 13 is conventionally performed. Since it is performed by work, it is effective in reducing the number of parts and the number of assembly steps.

Further, according to the present invention, the movable iron core 13 and the fixed iron core 12 are brought into contact with each other at the central portion thereof, and the conical surfaces 12B and 13B are not brought into contact with each other at the outer peripheral portion. Therefore, it is possible to effectively prevent the collision sound from being propagated to the outside when the electromagnetic coil 11 is energized.

Another embodiment of the present invention will be described with reference to FIG. A guide rod 12F protruding upward is integrally formed at the center of the flat portion 12C of the fixed iron core 12 in the longitudinal axis direction. Also, the conical recess 13 of the movable iron core 13
A magnet killer M made of an annular member formed of a non-magnetic material is press-fitted and arranged in the recess of A. The magnet killer M is a flat plate portion 5A facing the flat portion 12C of the truncated cone-shaped protrusion 12D and a flat plate. A guide hole 5B is formed at the center of the portion 5A and extends along the longitudinal axis direction. By using this embodiment, the same effect as that of the first embodiment can be achieved.

Further, another embodiment will be described with reference to FIG. The same reference numerals are used for the same structural parts as in FIG. 4, and only different parts will be described. Reference numeral 4 denotes an output rod for taking out the movement of the movable iron core 13 toward the outside. The output rod 4 is made of a non-magnetic material and is press-fitted and supported by the movable iron core 13, and the tip end thereof has the magnet killer M in the embodiment. 6A corresponding to the flat plate-like shape 5A and 6A
A guide hole 5B is formed integrally therewith. According to this embodiment, since the magnet killer M is integrally formed on the output rod 4, the magnet killer M and the output rod 4 can be shared by a single member, and the attachment thereof to the movable iron core 13 of the conventional output rod 4 is also performed. Since it is carried out by the attachment work, it is effective in reducing the number of parts and the number of assembling steps.

[0022]

As described above, according to the electromagnetic device of the present invention, it is possible to provide an electromagnetic device in which the movable iron core is prevented from collapsing and the movable iron core has excellent dynamic characteristics for a long period of time.
Particularly, by providing a magnet killer on the output rod, it is possible to reduce the component cost and the manufacturing cost, and further, by making the depth of the guide hole shallow, a sufficient magnetic force can be secured.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of an electromagnetic device according to the present invention.

FIG. 2 is a correlation diagram with respect to a fixed iron core during operation of the movable iron core in FIG.

FIG. 3 is a vertical sectional view showing another embodiment of the electromagnetic device according to the present invention.

FIG. 4 is a vertical sectional view showing another embodiment of the electromagnetic device according to the present invention.

FIG. 5 is a vertical sectional view showing another embodiment of the electromagnetic device according to the present invention.

FIG. 6 is a vertical cross-sectional view showing a conventional electromagnetic device.

[Explanation of symbols]

1 Guide hole 2A flat plate 2B guide rod M magnet killer 12 fixed iron core 13 movable iron core

Claims (5)

[Claims] 1. An electromagnetic coil wound in an annular shape, a fixed iron core fixedly arranged in the electromagnetic coil, and a movable iron core arranged to face the fixed iron core and adsorbed and separated from the fixed iron core. A truncated cone-shaped projection is formed at the end of the fixed core on the side of the movable core, and a truncated cone-shaped projection is formed at the end of the movable core on the side of the fixed core. In the electromagnetic device in which the concave portion is bored, a guide hole 1 along the longitudinal axis direction is bored in the center of the flat portion 12C of the truncated cone-shaped projection 12D of the fixed iron core, while the movable iron core 1
The flat part 13D of the truncated cone-shaped concave portion 13A of No. 3 has the flat part 12 of the truncated cone-shaped protruding part 12D formed of a non-magnetic material.
The magnet killer M is integrally provided with the flat plate portion 2A facing the C and the guide rod 2B that is inserted and supported in the guide hole 1 when protruding from the flat plate portion 2A toward the fixed iron core 12 side. 13. An electromagnetic device in which a guide rod 2B of 13 is slidably centered and supported in a guide hole 1 of a fixed iron core 12. 2. An electromagnetic coil wound in an annular shape, a fixed iron core fixedly arranged in the electromagnetic coil, and a movable iron core arranged to face the fixed iron core and adsorbed and separated from the fixed iron core. A truncated cone-shaped projection is formed at the end of the fixed core on the side of the movable core, and a truncated cone-shaped projection is formed at the end of the movable core on the side of the fixed core. In the electromagnetic device in which the concave portion is bored, a guide rod that extends along the longitudinal axis direction and projects from the flat portion is provided at the center of the flat portion 12C of the truncated cone-shaped projection 12D of the fixed iron core, while the movable rod is movable. In the flat portion 13D of the truncated cone-shaped recess 13A of the iron core 13, the flat plate portion 2A facing the flat portion 12C of the truncated cone-shaped protrusion 12D formed of a non-magnetic material, and the longitudinal axis at the center of the flat plate portion 2A Magnet killer with guide holes along the direction Is arranged, and the guide rod of the fixed iron core is slidably centered and supported by the guide hole of the movable iron core. 3. The electromagnetic device according to claim 1, wherein the guide rod is inserted into the guide hole only at the final stage of the movement of the movable iron core toward the fixed iron core to support the centering. 4. The electromagnetic device according to claim 1, wherein a magnet killer including the flat plate portion and the guide rod is integrally formed with an output rod made of a non-magnetic material that extends outward from the movable iron core. 5. The electromagnetic device according to claim 2, wherein a magnet killer including the flat plate portion and the guide hole is integrally formed with an output rod made of a non-magnetic material and extending outward from the movable iron core.