JPS6137910Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic plunger device that moves a plunger forward and backward by passing current through an electromagnetic coil.

Conventionally, as shown in FIG. 1, a plunger c is inserted into a hollow part of an electromagnetic coil b housed in a container body a so as to be movable in the axial direction, and the plunger c is attached to the container body a. It is known that the plunger c is supported by leaf springs d and d at both ends of the plunger, and the balance between the spring force and the magnetic force of the electromagnetic coil b causes the plunger c to move in a stroke proportional to the energizing current. However, in this case, the curvature of the leaf spring d accompanying the movement of the plunger c causes the plunger c to deviate in the radial direction, and if the stroke is increased, there is a risk that the plunger c will come into contact with the hollow inner wall of the electromagnetic coil b, so this is not preferable. do not have. For this reason, as seen in Japanese Patent Publication No. 51-34568, the radial deviation of the plunger can be reduced by attaching one end of the spring supported to the body and the other end to the tip of the arm provided on the plunger. Those who did so are known. However, this method cannot completely eliminate the deviation, and also has the disadvantages mentioned above.

Therefore, the present invention eliminates such inconvenience by allowing movement in the protruding direction of the leaf spring between the leaf spring and the plunger. A plunger 3 is inserted through the plunger 3 so as to be movable in the direction, and the plunger 3 is supported by leaf springs 4, 4 at both ends which are cantilevered on the container body 1. A long groove 5 for inserting and locking the plunger 3 is formed along the projecting direction, and a regulating piece 6 for restricting movement of the plunger 3 at least in the direction along the long groove 5 is provided in the container body 1. According to the present invention, a long groove 5 is formed along the protruding direction of the plate spring 4 cantilevered on the container body 1, and the long groove of the plunger 3 inserted into and locked in the long groove 5 is formed. A regulating piece 6 is provided to regulate the movement in the direction along the plunger 5, completely preventing deviation of the plunger 3 and giving it accurate movement in proportion to the energizing current. This has the effect of overcoming the inconveniences of the conventional method.

The second figure shows one example of the embodiment of the present invention, in which a valve body 10 for opening and closing a gas or other flow path 9 is provided at the lower end of the plunger 3, and the valve opening is controlled by the energization of the electromagnetic coil 2. The electromagnetic plunger device is shown as being variable in proportion to the current, and the plunger 3 is always urged downward to the closed side by leaf springs 4, 4 at its upper and lower ends.

The regulating piece 6 is configured, for example, as shown in FIG. 3, by a plate spring that is longitudinally cantilevered on the body 1 in a direction perpendicular to the plate spring 4, and has a long groove 5 at the tip of the plate spring 4 at its tip. Forming a long groove 7 orthogonal to
The plunger 3 is inserted and locked at the intersection of both the long grooves 5 and 7.

Next, to explain its operation, when the electromagnetic coil 2 is energized, an upward attractive force proportional to the energized current acts on the plunger 3, and the spring force and the attractive force of the leaf spring 4 and the regulating piece 6 are combined. Due to this balance, the plunger 3 is given an attractive force, that is, an upward movement of the stroke proportional to the energizing current, and the valve body 10 is given a valve opening operation with an opening degree proportional to the energizing current.

Here, the plunger 3 is regulated from moving in the longitudinal direction of the leaf spring 4 and in a direction perpendicular thereto by the long grooves 5 and 7 of the leaf spring 4 and the regulating piece 6, respectively, so that the plunger 3 moves accurately upward in the axial direction. The leaf spring 4 is allowed to elongate in the longitudinal direction due to its bending by the long groove 5, and is able to bend without causing reversal or other irregular operation due to the action of unsteady constant stress. Accurate valve opening operation proportional to the applied current is provided.

Incidentally, the regulating piece 6 is also allowed to elongate in the longitudinal direction due to its curvature by the long groove 7, so that it can be bent without causing irregular operation.

FIG. 4 shows another embodiment, in which the regulating piece 6 is constructed of a long leaf spring in the direction perpendicular to the leaf spring 4, and both ends of the regulating piece 6 are inserted into the grooves 11, 11 of the container body 1. are slidably engaged only in the longitudinal direction, and a shaft hole 8 facing the long groove 5 of the leaf spring 4 is formed in the middle thereof, and the plunger 3 is connected to the long groove 4 and the shaft hole 8.
It was designed to be inserted and locked.

In this case, the regulating piece 6 has the recessed grooves 11 at both ends,
At 11, longitudinal extension due to bending is permitted, so that reversal or other irregular operation does not occur, while longitudinal movement of the leaf spring 4 is restricted, and displacement of the plunger 3 is also prevented.

Note that the regulating piece 6 does not necessarily have to be made of a leaf spring, but when it is made of a leaf spring as described above,
Since no friction occurs in the axial direction with the plunger 3, more accurate proportional control is possible.

[Brief explanation of the drawing]

Figure 1 is a cutaway side view of an example of a conventional device;
The figure is a cross-sectional side view of one example of the device of the present invention, FIG. 3 is a cross-sectional view taken along the line -- in FIG. 2, and FIG. 4 is a cross-sectional view of another embodiment. 1... Container body, 2... Electromagnetic coil, 3... Plunger, 4... Leaf spring, 5... Long groove, 6... Regulating piece.

Claims (1)

[Claims for Utility Model Registration] 1. A plunger 3 is inserted into the hollow part of the electromagnetic coil 2 housed in the container body 1 so as to be movable in the axial direction, and both ends of the plunger 3 are cantilevered to the container body 1. In the type supported by plate springs 4, 4, a long groove 5 for inserting and locking the plunger 3 is formed at the tip of the plate spring 4 along its protruding direction, and at least the long groove of the plunger 3 is formed. The electromagnetic plunger device is provided with a regulating piece 6 that regulates movement in the direction along the direction 5. 2. The regulating piece 6 is attached to the plate spring 4 on the container body 1.
It is composed of a leaf spring cantilevered longitudinally in a direction perpendicular to , and has a long groove 7 perpendicular to the long groove 5 at its tip, and the plunger 3 is inserted and locked in the intersection of both the long grooves 5 and 7. An electromagnetic plunger device as set forth in claim 1 of the utility model registration claim. 3. The regulating piece 6 is constituted by a plate spring that is longitudinal in a direction perpendicular to the plate spring 4 and that is engaged with the body 1 so as to be slidable only in the longitudinal direction at both ends thereof, and a plate spring is provided in the middle thereof. The electromagnetic plunger device according to claim 1, which is a registered utility model, wherein a shaft hole 8 facing the long groove 5 is formed, and the plunger 3 is inserted into and locked in the long groove 5 and the shaft hole 8.