JPS6023031Y2 - π type ultrasonic transducer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to noise prevention in a π-type ferrite vibrator for ultrasonic waves.

In recent years, ultrasonic waves have come to be actively used in many fields of industry.

However, the current situation is that the noise generated by the strong vibration power is extremely intolerable for people who are constantly engaged in ultrasonic cleaning work, for example.

The sources of the noise are thought to be an intense cavity phenomenon (cavitation) in the cleaning liquid or the like that has received the ultrasonic waves, and a source from the vibrator body side.

In particular, it is known that, in the case of a common conventional π-type ferrite vibrator, a considerably annoying noise is generated from the vibrator body due to its structure.

That is, as shown in FIG. 1, the conventional π-type ferrite vibrator has a biasing magnet 4 attached to a sponge 3 in advance inserted into the open end side of the pair of legs 2, 2 of the vibrator body 1. By adhering the sponge 3 to the end surfaces 5, 5 of the pair of legs 2, 2, the biasing magnet 4 is fixedly held on the vibrator body 1.

The reason why the biasing magnet 4 is fixedly held on the legs 2, 2 of the vibrator main body 1 with the sponge 3 is that
When inserting the excitation winding formed in a loop shape in advance into the base of the legs 2, 2, or removing it from the base, the biasing magnet 4 The point is to get it out of the way.

However, according to the above-mentioned conventional configuration, the legs 2, 2 of the vibrator body 1 and the biasing magnet 4 come into direct contact with each other during vibration, resulting in a very annoying noise. was there.

In view of the above-mentioned drawbacks, the present invention provides a π-type ultrasonic vibrator which prevents the noise generated by the legs 2 of the vibrator body and the biasing magnet 4 during vibration.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Figure 2 is a side view of the π-type ultrasonic transducer according to the present invention (in addition,
The same components as in FIG. 1 are denoted by the same reference numerals.

) is shown. In the figure, 1 is a vibrator body, 2 is a leg of the vibrator body 1, 4 is a biasing magnet, and 6 is a silicone rubber interposed between the biasing magnet 4 and the legs 2, 2. It is.

According to the above configuration, during vibration, the legs 2 of the vibrator main body,
2 and biasing magnet 4 do not come into direct contact with each other due to silicone rubber 6.

Moreover, since the silicone rubber 6 is soft, it not only absorbs vibrations, but also makes it very easy to attach and detach the biasing magnet 4 from the legs 2, 2.

Incidentally, without silicone comb treatment, the noise level is 8.
While there is a 3 dB and harsh noise, when silicone rubber treatment is applied as in the present invention, the noise level is 80 dB and has the remarkable effect of completely eliminating the harsh noise.

In the case of the above example, the thickness of the silicone rubber was set to 0.3rIr, taking into account the characteristics of the vibrator, workability, etc. n~0.4
It is desirable to have a diameter of about m.

Further, in addition to the silicone rubber described above, a Mylar tape or the like may be wound around the side surface of the biasing magnet 4 and inserted into the legs 2, 2.

As described above, according to the present invention, since the vibration absorbing material is interposed between the π-type ultrasonic vibrator and the inserted biasing magnet, it is possible to completely eliminate the annoying noise caused by vibration. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional π-type ultrasonic transducer, and FIG. 2 is a side view of a π-type ultrasonic transducer according to the present invention. 1 is the vibrator body, 2 is the leg, 4 is the biasing magnet, and 6 is silicone rubber.

Claims (1)

[Scope of utility model registration request] A π-type ultrasonic vibrator having a pair of legs and a biasing magnet interposed between the legs, characterized in that vibration absorption is provided between the legs and the biasing magnet. π-type ultrasonic transducer.