JPS6242406A - Electromagnet - Google Patents

Abstract

PURPOSE:To reduce sliding resistance of a movable element as well as to suppress power consumption by a method wherein the external shape of the movable element is set to a barrel shape in the electromagnet to be provided in the ON-OFF electromagnet valve and the like to which a high-speed response property is required. CONSTITUTION:The external shape of the movable element 3a to be slidably housed in a core 2 is set in barrel shape, a push-rod 6a is provided independent of the movable element 3a,and the push-rod 6a is formed in such a manner that its end face which comes in contact with the movable element 3a has a spherical surface. The movable element 3a performes a sliding movement in the direction of a stator 4 by receiving small sliding resistance while performing micro-oscillation with a protrusion 10 as the center point. Excellent responsiveness can be obtained when an electromagnet is provided on an ON- OFF electromagnetic valve, and an ON-OFF time can be made to a minimum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electromagnet equipped with an equal pressure off-off solenoid valve which requires high-speed response.

[Background of the invention]

FIG. 2 is a sectional view showing a conventional electromagnet. In this figure, 3 is a movable element, which is basically formed in a cylindrical shape. 2 is a core on which the movable element 3 can slide; 4 is a stator attached to the core 2 so as to face the movable element 3; 1 is a coil wound around the core 2; 5 is a non-magnetic material; 6 is mover 3
It is a bushing rod fixedly attached to one end of the stator 4 and slidable inside the stator 4.

In such an electromagnet, when the coil 1 is energized,
Mover 3. Stator 4. A magnetic circuit is formed by the core 2, the movable element 3 slides, the stator 4 and the movable element 3 are attracted to each other, and as the movable element 3 slides, the bushing rod 6 moves to the second position.
Slide to the left in the diagram.

Furthermore, when the coil 1 is de-energized, the mover 3 slides due to the force of a return spring (not shown), and accordingly the bushing rod 6 slides to the right in the drawing, and the bushing rod 6 slides in the left-right direction in the drawing. The desired mechanical operation can be performed by the movement.

FIG. 3 is a front view of FIG. 2. In order to explain the functions of the electromagnet shown in FIG. As shown in the figure. As shown in this Figure 4.

When the coil I is energized, it can be modeled using a pair of U-shaped magnets 8-1 and 8-2 arranged to surround the movable element 3. Here, U-shaped magnet 8-1.8-2
The ON pole and S pole are determined for convenience, and the reverse relationship may be functionally acceptable.

In the case of the fourth figure, the S pole is induced magnetization on the surface of the mover 3 facing the N pole of the U-shaped magnet 8-1.8-2, and the N pole is induced on the surface of the mover 3 facing the S pole. It is expressed by

Between the facing surfaces of the former, the AI (axial) shown in Figure 4 of the same
An attractive force in the radial direction is generated between the latter opposing surfaces. Here, for the A direction, the attraction directions of the U-shaped magnets 8-1 and 8-2 are the same direction, whereas for the RJ direction, as shown in the figure, the U-shaped magnet 8-1 is directed upward. The mover 3 is attracted, and the U-shaped magnet 8-2 is about to attract the mover 3 downward.

FIG. 5 is an explanatory diagram modeling the relationship of forces in the RJ direction shown in FIG. 4. The magnet in the center of the diagram can remain in a resting position only when the beam =h, h+~h.

If this happens, the balance of forces will be disrupted, and the center magnet will be attracted to either the left or right magnet. In other words, in Fig. 2, if the center axes of the core 2 and mover 3 are even slightly shifted and eccentric, the above-mentioned phenomenon of being attracted to one side occurs, resulting in sliding resistance in the AI force direction, and the electromagnet shown in Fig. 2 For example, the on/off solenoid valve that is provided will have degraded responsiveness, making it impossible to shorten the off/off time.

For this reason, as shown in Fig. 6, the U-shaped magnet 8
Change the shapes of -1' and 8-2' to be symmetrical.

It is possible to eliminate the force in the R direction by this means, but in order to ensure the movement of the mover 3 in the direction of arrow 11, it is necessary to It is necessary to set the dimensions in advance, and along with the increase in magnetic resistance, the power consumption increases due to reasons such as the force acting in the opposite direction in the Ax direction.

This is a problem from an economic point of view.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned actual situation in the prior art, and its purpose is to provide an electromagnet that can simultaneously reduce the sliding resistance of a mover and suppress power consumption.

[Summary of the invention]

In order to achieve this objective, the present invention has the following features:
We focused on the relationship between the forces acting on this mover.

The outer shape of the movable element is set in a barrel shape, and the movable element swings about a convex portion on the outer circumference as a fulcrum, thereby reducing the force R in the radial direction of the movable element.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electromagnet of the present invention will be explained below with reference to the drawings.

FIG. 1 is an explanatory diagram showing a main part of an embodiment of the present invention.

In the embodiment shown in FIG. 1, the outer shape of the mover 3a slidably housed in the core 2 is set to a barrel shape, and the bushing rod 6a is separate from the mover 3a. The end surface that contacts the movable element 3a is formed to have, for example, a spherical surface. Note that the other configurations are the same as those shown in FIG. 2 described above, for example.

In this embodiment, the mover 3 housed in the core 2
In the case of a, the convex portion 10, which is the lower portion in the figure, is kept in contact with the core 2.

If the coil 1 is energized in such a state.

In addition to producing an axial cam acting in the direction of the stator 4, the lower part of the mover 3a approaches the core 2, so the clearance h1 becomes smaller than the clearance amount, thereby creating a radial cam 1. : Ji9ruga,
Since the mover 3aiJe is configured in a barrel shape,
Using the convex portion 10 as a fulcrum, the moment FAyR and the moment MR act, and these moments MM and MJI act in opposite directions. Here, the force is set in advance so that 1M〉MR. If the dimensions of F, R, and L are set, the movable element 3a swings so that the clearance h becomes smaller, that is, the radial radius Fdi becomes smaller, and the movable element 3a moves toward the convex part 10. The stator slides in four directions while generating minute vibrations centered around , subject to small sliding resistance, and accordingly the bushing rod 6a slides to perform the desired operation.

In the electromagnet configured in this way, the radial force FR is reduced as described above due to the swinging motion of the movable element 3a, so the sliding resistance is small. Therefore, when the electromagnet is installed in an on/off solenoid valve, Excellent responsiveness can be obtained and on-off times can be minimized. Also core 2
Since no special changes to the shape of the device are required, power consumption can be suppressed and it is therefore highly economical.

〔Effect of the invention〕

Since the electromagnet of the present invention is configured as described above, it is possible to reduce the sliding resistance of the mover and suppress the power consumption at the same time, resulting in excellent responsiveness and economical effects. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing essential parts of an embodiment of the electromagnet of the present invention, and FIG. 2 is a sectional view showing a conventional electromagnet. FIG. 3 is a front view of FIG. 2, and FIG. 4 is an explanatory diagram of a two-dimensional model of the minute slice portion of FIG. 3. gg5 is an explanatory diagram modeling the relationship of forces in the R true direction shown in FIG. 4, and FIG. 6 is an explanatory diagram showing another two-dimensional model conventionally considered from the two-dimensional model of FIG. 4. 1... Coil, 2... Core, 3a...
...Movable element. 4...15f child, 6 a...Butsch rod. Figure 1 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] a slidable mover; a core in which the mover is housed;
In the electromagnet that is attached to the core and includes a stator that is arranged to face the movable element and a coil that is wound around the core, the external shape of the movable element is set in a barrel shape. An electromagnet featuring