JPH0530326Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electromagnetic plunger device, and in particular,
The present invention relates to improvements in plungers, such as those that are effective when used in electromagnetic valves.

[Conventional technology]

As a solenoid valve used for fluid control, a valve body is provided so as to be interlocked with a plunger of an electromagnetic plunger device, which is a valve body operation mechanism, and the valve body is moved to and from the valve seat by the forward and backward movement of this plunger, and the valve body is moved to and from the valve seat. Some are configured so that the mouth can be opened and closed.

In such electromagnetic valves, the plunger is generally made of a ferromagnetic material and formed into a columnar or cylindrical shape.

[The problem that the idea aims to solve]

In such a solenoid valve, there is a problem that the response of the plunger is insufficient, resulting in a delay in the opening/closing control of the valve port by the valve body. In other words, if the plunger is integrally formed in a cylindrical or cylindrical shape, even if the current to the coil of the electromagnetic plunger device is momentarily cut off, an induced current will be generated in the plunger due to Lorentz's law. This current causes lines of magnetic force to remain in the plunger, resulting in a decrease in the responsiveness of the plunger.

An object of the present invention is to provide an electromagnetic plunger device that can improve the responsiveness of the plunger.

[Means to solve the problem]

An electromagnetic plunger device according to the present invention is an electromagnetic plunger device in which a plunger is fitted into the center of a coil so as to be freely retractable along a center line, and the plunger is formed by winding a plate material in a spiral shape. A feature is that an insulating layer is interposed between the contact surfaces of this plate material.

[Effect]

According to the above-mentioned means, since no electrical closed circuit is formed in the circumferential direction of the plunger, the lines of magnetic force formed in the plunger disappear quickly, and as a result, the response speed of the plunger becomes faster.

〔Example〕

FIG. 1 is a longitudinal sectional view showing a solenoid valve in which an electromagnetic plunger device, which is an embodiment of the present invention, is used;
FIG. 2 is a perspective view showing a plunger used therein, and FIG. 3 is a perspective view showing a conventional example for explaining its function.

In this embodiment, the electromagnetic plunger device according to the present invention is used as a valve body operating mechanism of a solenoid valve. This electromagnetic valve 1 includes a valve box 2, and inside the valve box 2, a valve chamber 3 is formed as a cylindrical hollow chamber. An inlet passage 4 and an outlet passage 5 are opened in the valve box 2 so as to communicate with the valve chamber 3, and a valve seat 7 annularly surrounds the valve port 6 at the end of the outlet passage 5 on the valve chamber 3 side. It is formed like this. Further, a valve body 8 is provided in the valve chamber 3 so as to be seated and separated from the valve seat 7, and the valve body 8 is supported so as to move integrally with a plunger of the electromagnetic plunger device, which will be described later. .

Electromagnetic plunger device 10 as a valve body operating mechanism
is the coil 12 wound on the coil bobbin 11
This coil 12 is connected to the valve chamber 3 in the valve box 2.
The interior is arranged concentrically. A plunger 13 is located in the hollow part of the coil bobbin 11 and the coil 12 is connected to the plunger 13.
The plunger 13 is fitted into the valve chamber 3 so that it can move forward and backward along the center line of the valve chamber 3, and the valve body 8 is fixed to one end surface of the plunger 13 so as to be able to move therewith.
A spring 9 is connected to the valve chamber 3 at the other end of the plunger 13.
The plunger 13 is moved to the valve seat 7 by applying a reaction force to the side wall surface of the valve seat 7.
is engaged so as to be constantly biased in the direction of .

In this embodiment, the plunger 13 is formed into a cylindrical shape by winding a plate material 14 made of a ferromagnetic material such as a thin silicon steel plate into a spiral shape, as shown in FIG. An insulating layer 15 is uniformly formed on one main surface of the plate 14 over the entire surface. Therefore, an insulating layer 15 is interposed between the inner and outer contact surfaces of the spirally wound plate material 14. Due to the presence of the insulating layer 15, the plunger 1 is wound into a spiral shape.
3 means that no electrical closed circuit is formed in the circumferential direction. The insulating layer 15 may be formed by applying an insulating material such as a resin having insulating properties to the surface of the board 14, or by placing an insulating sheet such as insulating paper on the surface of the board 14. , plate material 14
It may also be formed by winding it into a spiral shape.

Next, the action will be explained.

In the electromagnetic valve 1 having the above configuration, when the coil 12 in the electromagnetic plunger device 10 serving as the valve body operating mechanism is not energized, the plunger 13 is biased toward the valve seat 7 by the spring 9. Since the valve body 8 is pressed against the valve seat 7, the valve port 6 is closed.

When the coil 12 is energized, the plunger 13 is moved away from the valve seat 7 by the magnetic force of the coil 12 against the biasing force of the spring 9.
The valve body 8 is separated from the valve seat 7, and the valve port 6 is opened.
As a result, fluid flows from the inlet passage 4 to the outlet passage 5 via the valve port 6.

When the current to the coil 12 is stopped, the magnetic force acting on the plunger 13 due to the coil 12 is canceled, so the plunger 13 is pushed back by the spring 9, and the valve body 8 is pressed against the valve seat 7.
Valve port 6 is closed.

By the way, as shown in FIG. 3, in the case of the conventional plunger 13' which is integrally formed in a cylindrical shape, even if the supply current I to the coil is momentarily cut off, the Lorentz current According to the law, an induced current Ie is generated in the plunger 13', and the lines of magnetic force B remain due to this induced current Ie, so that the return of the plunger 13' is delayed until the induced current Ie decreases. In other words, the plunger 1 is
This is because 3' continues to be attracted against the spring.

However, in this embodiment, the plunger 13
Since the plate material 14 is wound in a spiral shape through the insulating layer 15, no electrical closed circuit is formed in the circumferential direction.
After the supply current to the coil 12 is cut off, the plunger 13 is returned instantaneously with good response by the spring 9.

That is, since the plunger 13 does not form a closed circuit in the circumferential direction, even if the supply current I to the coil 12 is cut off, there is no induced current in the plunger 13.
Ie rarely occurs. Therefore, there are almost no magnetic lines of force B remaining due to the induced current Ie, and the plunger 13
The lines of magnetic force acting on the coil 12 disappear instantaneously when the supply current I to the coil 12 is cut off. As a result, the plunger 13 is immediately pushed back by the urging force of the spring 9, and the valve body 8 is immediately seated on the valve seat 7.
In other words, the response of the plunger 13 is much better than that of the conventional plunger 13'.

According to this embodiment, the responsiveness of the plunger 13 is extremely good, so that the responsiveness of the solenoid valve 1 whose valve body 8 is operated by the plunger 13 is also extremely good. Accuracy and reliability of fluid control can be increased.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified without departing from the gist thereof.
It goes without saying that various changes are possible.

For example, the plunger is not limited to being formed to have a circular cross section, but may be formed to have a polygonal shape such as a rectangular shape as necessary.

Further, the insulating layer is not limited to being formed on one main surface of the plate material, but may be formed on both main surfaces.

In the embodiment described above, the case where the electromagnetic plunger device is used as a valve body operating mechanism of a solenoid valve has been described, but the present invention can be applied to all electromagnetic plunger devices used for other purposes. In particular, the present invention exhibits excellent effects when applied to electromagnetic plunger devices that require high responsiveness of the plunger.

[Effect of idea]

As explained above, according to the present invention, since a closed circuit is not formed in the circumferential direction of the plunger, the lines of magnetic force can be instantaneously eliminated when the coil is energized and energized, and the coil energization is turned on and off.
It is possible to improve plunger responsiveness to

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a solenoid valve in which an electromagnetic plunger device, which is an embodiment of the present invention, is used;
FIG. 2 is a perspective view showing a plunger used therein, and FIG. 3 is a perspective view showing a conventional example for explaining its function. 1...Solenoid valve, 2...Valve box, 3...Valve chamber, 4...
...Inlet passage, 5...Outlet passage, 6...Valve port, 7...
... Valve seat, 8... Valve body, 9... Spring, 10...
...Electromagnetic plunger device, 11...Coil bobbin,
12... Coil, 13... Plunger, 14...
Plate material, 15...Insulating layer.

Claims (1)

[Scope of utility model registration request] In an electromagnetic plunger device in which a plunger is inserted into the center of a coil so as to be movable back and forth along the center line, the plunger is formed by winding a plate material in a spiral shape, and an insulating layer is provided between the contact surfaces of the plate material. An electromagnetic plunger device characterized by being provided with.