JPH057848B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a direct-acting electromagnetic drive device used for control valves and the like.

(B) Prior art Generally, in various industrial fields, direct-acting electromagnetic drive devices are provided, and as shown in FIG. 6, this electromagnetic drive device includes an excitation coil b wound around a bobbin a. There is one in which a magnetic means c is constructed by being rotated, and this magnetic means c is housed in a yoke d, and a plunger e is inserted into a bobbin a through this yoke d. A return spring f is interposed between the plunger e and the yoke d, and when the excitation coil b is also energized, a magnetic circuit is formed in which the plunger e passes through the fixed core g, so that the plunger e is attracted to the fixed core g. It's getting old. Also, if the power is cut off, the plansha e
is returned by the spring force of the return spring f, and moves in and out of the yoke d.

(c) Problems to be solved by the invention In the above-mentioned direct-acting electromagnetic drive device, only one plunger e is provided, and this plunger e can be separated by turning on and off the excitation coil b. It was only necessary to move it to two positions: the position and the suction position.

However, this has the problem that, for example, in a control valve that controls the gas amount in two or three stages, two or three electromagnetic drive devices must be provided, which requires a large space. Further, there are disadvantages in that the number of parts increases and the cost becomes high.

(d) Means and operation for solving the problems This invention provides a plurality of plungers that are slidably fitted in sequence to constitute a multi-stage plunger means, and an excitation coil that is wound around a bobbin. A plurality of magnetic means are arranged in parallel corresponding to the plungers, the plunger means are inserted into each magnetic means, and the outer plungers of each stage are arranged in parallel to each other in correspondence with the plungers. A magnetic circuit is configured corresponding to the means, and a return means is linked to each of the plungers, and when the excitation coils of each of the magnetic means are sequentially excited, the corresponding plungers are sequentially attracted, and a plurality of tips of the plunger means are attracted. When each excitation coil is demagnetized while moving in stages, each corresponding plunger is returned by a return means, and the tip of the plunger means is moved in a plurality of stages.

(e) Embodiments Examples of the present invention will be described in detail below with reference to the drawings.

Embodiment 1 As shown in FIG. 1, 1 is a direct-acting electromagnetic drive device that controls the amount of gas, etc.
It can be switched between three levels: fully open, half open, and shielded.

This electromagnetic drive device 1 includes two plungers 2,
3 and two magnetic means 5 and 6. The first plunger 2 is formed in a cylindrical shape, and has a large diameter portion 2a on the base end side.
and a small diameter portion 2b on the tip side. The second plunger 3 is formed into a cylindrical shape and is slidably fitted into the first plunger 2. The second plunger 3 is made up of a large inner diameter part 3a and a small inner diameter part 3b corresponding to the first plunger 2, and is shorter than the first plunger 2, so that the first plunger 2 protrudes from side to side and comes into contact with the stepped part. It is configured as follows.

On the other hand, the magnetic means 5 and 6 are connected to the yokes 7 and 6, respectively.
8 and are arranged in parallel in the axial direction of the plunger means 4 with a magnetic isolation spacer 9 interposed therebetween. The first yoke 7 has a donut-shaped front plate 7b attached to a main body 7a having a U-shaped cross section, and the first plunger 2
The large-diameter portion 2a passes through the front plate 7b and is slidably inserted into the guide pipe 10. The second yoke 8 has a donut-shaped front plate 8b attached to a main body 8a having a U-shaped cross section, and the second plunger 3 passes through the front plate 8b and is slidably inserted into the guide pipe 11. At the same time, a first plunger 2 is provided passing through the second yoke 8. Further, fixed cores 12 and 13 are attached to the base end surfaces of the yokes 7 and 8 in the guide pipes 10 and 11, and are configured such that the base end surfaces of the respective plungers 2 and 3 come into contact with each other.

Both the magnetic means 5 and 6 correspond to the first plunger 2 and the second plunger 3, and the electromagnet 1
4 and 15 and permanent magnets 16 and 17. Electromagnets 14 and 15 are guide pipes 10 and 1
Excitation coils 14b, 15b are wound around bobbins 14a, 15a fitted to bobbins 1, and when each excitation coil 14b, 15b is energized, the plungers 2, 3, yokes 7, 8 and fixed cores 12, 1 respectively
A magnetic circuit passing through 3 is constructed. In addition, the permanent magnets 16 and 17 are magnetic pole pieces 18 and 1.
The plungers 2, 3 and the yokes 7, 8 are provided in contact with the guide pipes 10, 11 via the guide pipes 10, 11, the south pole faces are in contact with the branch pieces 18, 19, the north pole faces are in contact with the yokes 7, 8, and the plungers 2, 3, yokes 7, 8, , 3, yokes 7, 8, and fixed cores 12, 13 to form a magnetic circuit. Then, the magnetic force between the electromagnets 14 and 15 and the permanent magnets 16 and 17 is applied to the plungers 2 and 3.
It is designed so that it acts in parallel.

Further, compression return springs 20 and 21 are interposed between the tips of the first plunger 2 and the second plunger 3 and between the tips of the second plunger 3 and the second yoke 8, so that each plunger 2 and 3 is moved in the projecting direction. is energized by

Next, the operation of this direct-acting electromagnetic drive device 1 will be explained.

First, the first and second excitation coils 14b, 15b
When the plungers are not energized, the spring force of the return springs 20 and 21 causes both the plungers 2 and 3 to protrude into the first state position, as shown in FIG. Next, the excitation coils 14b, 15b are energized, but the permanent magnets 16, 1
7 will be explained below.

Each magnetic means 5, 6 is configured so that the magnetic force of the electromagnets 14, 15 and the magnetic force of the permanent magnets 16, 17 act in parallel, so Fa=k(φi+αφa) ² −fs...(1) Fa: attraction force, K: proportionality constant, φa: magnetic flux due to permanent magnet, φi: magnetic flux due to electromagnet, α: rightward flow rate of φa, fs: spring drag force. Now, in equation (1), if fs is ignored for simplicity and K=1 and φa=ηφi, then Fa=(1+αη) ² ·φi ² ...(2). On the other hand, the attractive force Fb of only the electromagnet is Fb=K·φio ² −fs (3), and similarly to equation (1), fs is ignored, K=1, and φi=φio. Note that φio is the magnetic flux caused by the electromagnet.

From these equations (2) and (3), the ratio of Fa and Fb is found as Fa/Fb=(1+αη) ² ...(4), and when the permanent magnets 16 and 17 are used together, the attractive force is large, This will reduce power consumption.

When the second excitation coil 15b is first energized using this attractive force Fa to form a magnetic circuit, the second plunger 3 is attracted and attracted to the fixed core 13. Along with this movement, the first plunger 2 also moves, and as shown in FIG. 2, the tip of the first plunger 2 moves by the distance X between the second plunger 3 and the fixed core 13.

Subsequently, when the first excitation coil 14b is energized to form a magnetic circuit, the first plunger 2 is attracted to the fixed core 12. Therefore, as shown in Figure 3,
The first plunger 2 is moved by the distance Y from the fixed core 12.
The leading end of the position moves, and a second state position and a third state position are formed. Each state is then self-maintained by the attractive force of the permanent magnets 16 and 17.

Next, when returning, the first excitation coil 14
A negative pulse is applied to b to separate the first plunger 2 and move it by Y, and then the second excitation coil 1
When a negative pulse is applied to 5b to cause the second plunger 3 to leave, the second plunger 3 will also move by an amount of X, returning the state shown in FIG. 3 to the state shown in FIGS. 2 and 1. .

Therefore, the tip of the first plunger 2 moves to three positions, and three stages of control are performed.

Embodiment 2 This embodiment is shown in FIG. 4, in which the first magnetic means 22 and the second magnetic means 23 are
It consists of only 5.

Therefore, the functions and operations thereof are the same as in the first embodiment except that the plungers 2 and 3 are not self-retained.

Embodiment 3 This embodiment is shown in FIG. 5, in which the plunger means 4 is composed of three plungers 2, 3, and 24, and is adapted to move in four stages.

The second plunger 3 has a large inner diameter section 3a, a small inner diameter section 3b, and a small outer diameter section 3c formed on the distal end side, and is slidably fitted into the first plunger 2. The third plunger 24 is comprised of a large inner diameter part 24a and a small inner diameter part 24b, and is fitted into the second plunger 3 so as to be freely slidable.

On the other hand, three magnetic means 22, 23, 25 are provided corresponding to the plungers 2, 3, 24, and the electromagnet 1
It is composed of only 4, 15, and 26. and,
The third magnetic means 25 corresponds to the third plunger 24 and is arranged in parallel with the second magnetic means 23 via the magnetic isolation spacer 9. Similarly to the other magnetic means 22 and 23, a guide pipe 28 is provided in the yoke 27. In addition, an electromagnet 26 including an excitation coil 26b wound around a bobbin 26a is provided.

Next, to explain the operation, first, the third excitation coil 26b is energized to form a magnetic circuit, the third plungers 3 and 4 move, and the first
state becomes the second state. Subsequently, the second excitation coil 15b is energized to attract the second plunger 3, and the state shifts to the third state.Finally, the first excitation coil 14b is energized to attract the first plunger 2, and the state shifts to the fourth state.

This results in switching to 4 stages, and when returning to normal state, all you have to do is demagnetize.

In addition, in Examples 2 and 3, the return spring is omitted in FIGS. 4 and 5.

Further, in the third embodiment, each magnetic means 22, 2
3 and 25 may be provided with permanent magnets as in the first embodiment.

Furthermore, the electromagnetic drive device of the present invention may be configured to have five or more stages of switching, and four or more plungers and corresponding magnetic means may be provided.

Furthermore, although the tip position of the plunger means is switched to each state at the tip position of the first plunger 2, it may be changed telescopically by changing the stroke of each plunger.

(F) Effects of the Invention As described above, according to the direct-acting electromagnetic drive device of the present invention, a plurality of plungers are slidably fitted one after another to constitute a plunger means, and a magnetic drive device having an excitation coil is used. Since a plurality of means are arranged in parallel corresponding to the plungers so that the plunger means can be moved in multiple stages, the tip of the plunger means can be moved to three or more positions, so that many functions can be exhibited. In addition to this, it is also possible to provide versatility. For example, in controlling gas volume, in addition to fully opening and shielding, one device can also perform half-opening, 1/3 opening and closing, etc., making it possible to perform multiple controls in a small space and reducing the number of parts. Because it can be done, it can be made cheap.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention, FIG. 1 is a central vertical sectional view of the direct-acting electromagnetic drive device of Embodiment 1, and FIGS. 2 and 3 are respectively in operating states. FIG. 4 is a central vertical cross-sectional view of the second embodiment, FIG. 5 is a central vertical cross-sectional view of the third embodiment, and FIG. 6 is a conventional direct-acting type. FIG. 3 is a central vertical cross-sectional view of the electromagnetic drive device. 1: Direct-acting electromagnetic drive device, 2, 3, 24: Plunger, 4: Plunger means, 5, 6, 22, 2
3, 25: Magnetic means, 14, 15, 26: Electromagnet, 14a, 15a, 26a: Bobbin, 14b,
15b, 26b: Excitation coil, 16, 17: Permanent magnet.

Claims (1)

[Claims] 1. A plurality of plungers are sequentially and slidably fitted to constitute a plurality of stages of plunger means,
A magnetic means includes an excitation coil wound around a bobbin, a plurality of magnetic means are arranged in parallel corresponding to the plunger, the plunger means is inserted into each magnetic means, and each stage A magnetic circuit is configured such that each of the outer plungers corresponds to the magnetic means, and a return means is linked to each of the plungers, and excitation coils of each of the magnetic means are energized to move the tip of the plunger means in multiple stages. A direct-acting electromagnetic drive device characterized by a reciprocating drive. 2. The direct-acting electromagnetic drive device according to claim 1, wherein the magnetic means includes a permanent magnet and holds each corresponding plunger.