JPS6032734Y2 - solenoid - Google Patents

Description

[Detailed description of the invention] The present invention provides a solenoid that uses a thin-walled magnetic pipe as a plunger guide between the plunger or the fixed core and the inner surface of the plunger guide, or between both the plunger and the fixed core and the inner surface of the plunger guide. The present invention relates to a solenoid that reduces magnetic leakage and reduces the drop in attraction force of a plunger by providing a gap larger than the gap required for movement.

In conventional solenoids, a non-magnetic pipe was used as a plunger guide, so there was no magnetic leakage between the plunger and the fixed core, but in recent years, magnetic pipes (
For example, as magnets (with a saturation magnetic flux density of 0.10 Wb/d or higher) are used, the main magnetic flux that exerts an attractive force between the plunger and the fixed iron core leaks through the magnetic pipe, resulting in a decrease in this attractive force. The disadvantage of doing so has arisen.

As a countermeasure to this problem, the conventional method has been to reduce the wall thickness of the magnetic pipe and minimize its cross-sectional area.
This was still not enough, so more effective measures were needed.

Therefore, an object of the present invention is to provide a solenoid that uses a magnetic pipe as a plunger guide and has a simple structure that does not reduce the magnetic attraction force between the plunger and the fixed iron core.

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is a solenoid according to the present invention, 2 is a plunger guide made of a tube made of magnetic material, 3 is a fixed iron core that is fitted and fixed to one end of the plunger guide, and 4 is a fixed iron core that is fitted and fixed to the other end of the plunger guide. a stopper 5, a plunger movably inserted into the plunger guide 2, 6 a winding provided around the plunger guide 2, 7
8 is a yoke that surrounds a part of the winding to form a magnetic path, and 8 is a plunger 5 that is inserted into the axial hole of the fixed core 3.
This is a bushing rod that transmits the movement of the valve to, for example, a valve body.

As shown in detail in FIG. 2, a small diameter portion 3 is formed on the outer periphery of the inner end of the fixed core 3, that is, the end face 31 on the plunger 5 side, so as to form an annular gap C3 between the fixed core 3 and the plunger guide.
2 is formed.

A small diameter portion 52 is also formed on the outer periphery of the end face 51 of the plunger 5 on the fixed core side so as to form an annular gap C2 with the plunger guide.

This gap C2 is the gap C1 necessary for moving the plunger.
It's bigger.

I like this fs'r2. The value of C3 is preferably 1, and the maximum value is the sum of the sliding speed of the moving part of the plunger, 1, and 174 to 2 times the wall thickness of the plunger guide.

In other words, if the outer diameter of the plunger is D, the outer diameter of the small diameter portion 32.52 is d1, and the wall thickness of the plunger guide is t, then D-1/
The range of 2t≧d≧D−4t is preferable.

The length of the small diameter portion 52 in the axial direction is 1.5 to 2. The maximum is up to e.

FIG. 3 shows changes in magnetic leakage l due to the plunger guide 2 (magnetic material), which is the basis of the present invention.

The mouth shows a conventional solenoid, A shows the solenoid according to the present invention, and the gap is set from 01 to 02. This shows a state in which magnetic leakage decreases due to an increase in C3.

f is the main magnetic flux that generates the attractive force between the plunger 5 and the fixed iron core 3, and this increases due to reduction in magnetic leakage.

As is clear from the above description, the solenoid according to the present invention has a simple structure in which the gap between the plunger, fixed iron core, and plunger guide is increased, even when a magnetic material is used for the plunger guide, and the attraction force of the plunger is increased. It has the effect of reducing the decline in

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the Tsuremade according to the present invention, Figure 2 is an enlarged view of a part of the solenoid in Figure 1, and Figure 3 is a diagram comparing the operating state of magnetic flux between the solenoid according to the present invention and a conventional solenoid. be. 1: Solenoid, 2 Ni lunge gear guide, 3: Fixed iron core, 4: Stopper, 5 Ni lunge gear, 6: Winding wire, 7: Yoke, 8: Push rod.

Claims (1)

[Scope of utility model registration request] A solenoid having a winding, a plunger guide made of a magnetic material inserted into the winding, a fixed iron core fitted and fixed to one end of the plunger guide, and a plunger movably inserted into the plunger guide. A solenoid characterized in that a small diameter portion is formed on at least one of the plunger-side end surface of the fixed iron core and the fixed iron core-side end surface of the plunger to form a gap with the plunger guide.