JPS6325699Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a noise reduction structure for a solenoid or the like, and particularly to a noise reduction structure for an iron core holder in a solenoid or the like.

Many conventional solenoids and the like have a structure as schematically shown in FIG. 1. In the figure, 1 is a movable iron core made of soft magnetic material, 2 is an electromagnetic coil, and 3 is a movable iron core made of soft magnetic material.
30 is a yoke made of a soft magnetic material, 30 is a plate made of a soft magnetic material that is installed at both ends of the yoke and forms a magnetic circuit together with the yoke 3, and 4 is a fixed iron core made of a soft magnetic material.

Therefore, when the electromagnetic coil 2 is energized, the movable core 1 is attracted toward the fixed core 4 and inevitably generates a collision sound when joined to the fixed core 4.

For this reason, when the solenoid repeatedly operates continuously, there is a drawback that noise is generated.

In order to prevent this, a flexible member such as rubber is provided at the tip of the movable core or the fixed core to provide a buffer between the two cores and to muffle the sound.

However, if you do this, a gap will be created between the two iron cores equal to the thickness of the cushioning material, so the performance of the solenoid will be lower than before, so it will take more power to maintain the same performance. It is necessary to apply the same amount of energy, which results in disadvantages such as a large size.

In order to eliminate the above-mentioned drawbacks, the present invention has been developed by inserting a core receiver opposite the movable core into a through hole at the bottom of the yoke so as to be able to slide freely, and elastically attaching it to the yoke using a spring or the like installed concentrically with the core receiver. In addition to supporting the movable core, by fitting a buffer plate such as a rubber plate to the part that protrudes from the through hole, it buffers the collision when the movable core is joined to the core receiver, and also protects the movable core when it is restored. The purpose of the present invention is to provide a sound-dampening structure for a solenoid or the like that has a large sound-damping effect without losing the performance of a conventional solenoid without a damping means, by muffling the sound of collision with the yoke by the above-mentioned buffer plate. .

The present invention will be explained in detail below.

FIG. 2 is a sectional view showing an embodiment of the present invention, and the same parts as in FIG. 1 are given the same symbols.

In the figure, 31 is a through hole drilled in the center of the bottom of the yoke 3, and 5 is an iron core holder that can slide inside the through hole 31, and its tip protrudes to the outside.

Reference numeral 6 is a shock absorbing material such as a spring, which is fitted concentrically to the core receiver 5 and elastically supports it with respect to the yoke.

Figure 3 shows the attraction force p and load l of the solenoid with respect to changes in the stroke distance x of the solenoid's movable core.
In the curve diagram showing the relationship, the shaded part shows the part consumed by the elastic force of the spring 6. Therefore, in the vicinity of x=0, the attractive force p increases rapidly and causes the movable core 1 to collide with the fixed core 4, but it can be assumed that this collision force is absorbed by the spring 6, increasing the buffering effect. .

Reference numeral 7 denotes a buffer plate such as a rubber plate, which is fixed to the core receiver by a washer 8.

Next, the operation of this embodiment will be explained.

Now, if the electromagnetic coil 2 is energized, the movable iron core 1
is attracted toward the core receiver 5 and joins to its tip, but since the core receiver 5 is elastically supported by the spring 6, it slides while in contact with the movable core 1 while compressing the spring 6. and stop at the specified position.

Therefore, most of the kinetic energy of the movable core 1 is absorbed as elastic energy of the spring 6 via the core receiver 5, and is buffered, resulting in extremely small collision noise, compared to a solenoid without a buffering means as shown in FIG. can reduce the impact sound pressure level by 5~10db.

Next, due to the energy stored in the spring 6, the movable iron core 1 and the iron core receiver 5 move as shown in Fig. 2 or Fig. 5.
However, since the rubber plate 7 absorbs this energy, the sound of the impact of the yoke 3 on the lower side can be easily muffled. Moreover, when the suction operation is completed, the through hole of the yoke 3 and the core receiver 5 are even smaller than in the case of a fixed core as shown in FIG.
Since the gap can be maintained at about 0.05 mm, the solenoid of this embodiment exhibits almost the same performance as the solenoid having the structure shown in FIG.

If the bottom of the yoke 3 has a barring structure as shown in Fig. 4, the core receiver 5 will be able to slide more stably. The silencing structure of this embodiment can also be used for the structure of a core receiver in a latching solenoid which is provided at at least one of the upper and lower ends of the structure and has a structure in which a movable core can slide inside the latching solenoid. There are advantages.

5A and 5B are a front sectional view and a side view showing a second embodiment of the present invention, in which the same parts as in FIGS. 1 and 2 are given the same symbols, and 32 has both ends joined. A U-shaped spring support fitting is fixed to the bottom of the iron 3, and a spring 6 fixed to the bottom of the metal fitting always pushes up a washer 8 fixed to the protruding end of the iron core holder from below.

As described above, in the case of the second embodiment of the present invention, the spring 6 supports the core receiver 5 concentrically and elastically within the yoke in the first embodiment, whereas the spring 6 supports the core receiver 5 concentrically and elastically within the yoke. The only difference is that the projecting end is supported concentrically and elastically, so
Its operation can be easily deduced from the operation of the first embodiment.

Therefore, it goes without saying that in the case of the second embodiment as well, it is possible to provide a good sound-muffling latching solenoid that can be used as a core holder for a latching solenoid.

As explained above, according to the present invention, the core receiver is simply supported in a movable manner through an elastic material, and its performance is improved when compared to conventional solenoids that have a fixed core. Although there is no change in the impact sound pressure level, it has many effects such as being able to significantly reduce the impact sound pressure level. Therefore, the present invention provides a noise reduction structure suitable for achieving the purpose of noise reduction for general solenoids, latching solenoids, etc. be able to.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional solenoid, FIG. 2 is a front sectional view of the first embodiment of the present invention, and FIG. 3 is a relationship diagram between the suction force of the solenoid and the travel distance of the movable iron core.
Fig. 4 is a diagram showing another example of the partial structure, Fig. 5
A and B are a front sectional view and a side view showing a second embodiment of the present invention. 1...Movable iron core, 2...Electromagnetic coil, 3...Yoke, 30...Plate, 31...Through hole, 32...
Spring mounting bracket, 4... fixed core, 5... core holder, 6... spring, 7... rubber plate, 8...
…watsiyah.

Claims (1)

[Scope of utility model registration request] The movable core is fitted with an iron core receiver which is slidably inserted into a through hole at the bottom of the yoke and is elastically supported by a spring or the like, and a flexible buffer plate is fitted onto the end protruding from the through hole. A noise-reducing structure for solenoid, etc., which are installed opposite each other.