JPS6311938B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is applied to a liquid atomizer that atomizes water into fine particles by vibration of an ultrasonic vibrator, and inhales this atomization into the nasal cavity and oral cavity to moisten the mucous membranes, soothe the dry state of the mucous membranes, and relieve inflammation. This invention relates to a holding structure for an ultrasonic transducer. A conventional holding structure for this type of ultrasonic vibrator includes one in which the vibration nodes of the vibrating horn 2 are held by an elastic body. In this case, in the case of a conical horn (Fig. 1b) and an exponential horn (Fig. 1c) shown in Fig. 1, the vibration node appears in the middle of the curve, so it is relatively easy to hold it with an elastic body. Compared to the step horn (FIG. 1a), the amplitude expansion ratio was small and processing was difficult. Here, the amplitude expansion ratio is the area S ₂ of the vibration input end A for a step horn whose cross-sectional area is changed stepwise.
According to the ratio (S ₂ /S ₁ ) of the area S 1 and the area S ₁ of the vibration output end B,
In an exponential horn whose cross-sectional area is changed exponentially, the cross-sectional area can be changed as a linear function by the ratio of the diameter d ₂ of the vibration input end A to the diameter d ₁ of the vibration output end B (d ₂ /d ₁ ). For a conical horn changed to , it is determined by the square root of the ratio of diameter d ₂ and d ₁ (√ _{2 1} ). On the other hand, in the case of a step horn, the nodes of vibration are located on the continuous plane of the small diameter section 2a and the large diameter section 2b, so this node cannot be held. Therefore, the outer periphery of the large diameter portion is held, but if the step horn is fixed with an elastic body, vibrations in the radial direction of the step horn will be lost. Further, since the outer periphery of the large diameter portion is simply gripped and held by the elastic body, the positional stability of the step horn is poor and the step horn often comes off due to impact force. The present invention has been made in view of the above circumstances, and includes a holding groove provided near the vibration node on the outer periphery of the step horn, an elastic body having a recessed portion on the outer periphery press-fitted into this groove, and a holding groove provided in the vicinity of the vibration node on the outer periphery of the step horn. By fitting the convex part provided on the inner circumference of the retaining ring, the step horn is fixed in the axial direction, but is slidable in the radial direction, thereby eliminating retention loss in the radial direction due to vibration and improving the stability of the step horn. It is an object of the present invention to provide a holding structure for an ultrasonic vibrator of a liquid sprayer that ensures secure holding. That is, the holding structure of the ultrasonic vibrator of the liquid sprayer of the present invention is such that the step horn 2 of the ultrasonic vibrator 1 is
A holding groove 3 is provided near the vibration node on the outer periphery of the
A vibration isolating elastic body 4 is press-fitted into the holding groove 3, a recess 5 is provided on the outer periphery of the vibration isolating elastic body 4, and a convex portion 7 provided on the inner periphery of the retaining ring 6 is fitted into the recess 5. and step horn 2 against retaining ring 6.
is clamped and fixed in the axial direction and is slidable in the radial direction, and the holding ring 6 is supported within the casing 8. The present invention will be described below based on embodiments shown in the accompanying drawings. FIG. 2 shows an example of a liquid sprayer constructed using an embodiment of the present invention. A mounting opening 10 for mounting the vibrator 1 is opened in a substantially round hole shape. An ultrasonic transducer 1 is placed directly below the partition plate 9.
It has a built-in oscillation circuit section 11 and a power switch 12 for vibrating the power supply section 1.
3 is provided. The power supply unit 13 has a dual power supply system, and a dry battery 14 can be supplied as a power source, and a household AC power supply can also be used as a power source via a cord connected to the jack 15. There is. Reference numeral 1 denotes an ultrasonic vibrator consisting of an electrostrictive element 16 that generates vibrations and a step horn 2 that magnifies the vibrations.As shown in FIGS. 3 and 4, one electrode of the electrostrictive element 16 is Element 1
The other electrode is electrically connected to the step horn 2 by bonding the electrostrictive element 16 and the step horn 2 with a conductive adhesive 17. step horn 2
A holding groove 3 is provided on the outer periphery of the large diameter part 2b near the vibration node on the continuous surface of the small diameter part 2a and the large diameter part 2b, and in this embodiment, the holding groove 3 has a groove width l ₁ A vibration-proof rubber 4a as a vibration-proof elastic body 4 having a width _l2 larger than that is press-fitted. This anti-vibration rubber 4a is ring-shaped as shown in FIG. 5, and has a plurality of recesses 5 on its outer periphery. As shown in FIG.
A convex portion 7 is provided to correspond to the concave portion 5 of a, and the step horn 2, that is, the ultrasonic vibrator 1 is held by fitting the convex portion 7 into the concave portion 5 of the vibration isolating rubber 4a. The outer periphery of the holding ring 6 is provided with a plurality of outwardly projecting protrusions 18, and these protrusions 18 are connected to recesses provided on the inner periphery of a holding frame 19 fixed to the casing 8, as shown in FIG. 2
0 to support the retaining ring 6 on the casing 8. Here, as shown in FIG. 2, a water absorber 21 that sucks up water is set at the tip of the step horn 2, and when the power switch 12 is turned on, the oscillation circuit section 11 emits a high frequency voltage that matches the resonant frequency of the step horn 2 to generate ultrasonic vibrations. The voltage is applied to the electrostrictive element 16 of the step horn 1, and the step horn 2 begins to vibrate, and this vibration atomizes the suction water into fine particles. In order to spray suction water, it is necessary for the spray surface to reach a certain amplitude, but it is desirable that the electric power required for this is small. When holding the step horn 2 of the ultrasonic transducer, holding the nodes that do not vibrate will result in less holding loss and require less power; however, holding the parts with a large amplitude will increase the holding loss and require less power. growing. Therefore, in the illustrated example, the holding groove 3 is provided at the vibration node on the continuous surface of the large diameter part and the small diameter part of the step horn 2, that is, on the outer periphery of the large diameter part 2b near the zero vibration position. be. As shown in FIG. 8, when the amplitude of the rear end a of the electrostrictive element 16 of the ultrasonic transducer 1 is set to 1.0, the amplitude of each part of the step horn 2 is the first
c-
The amplitude (width difference) in the Y direction at point d is 0.07, and the amplitude in the X direction at point c is 0.22. Therefore, as shown in FIG. 9, the step horn is fixed in the axial direction (Y direction) by fitting the protrusion 7 of the retaining ring 6 into the recess 5 on the outer periphery of the vibration isolating rubber 4a. , the tip of the convex part 7 of the holding ring 6 and the concave part 5 of the vibration-proofing rubber 4a
The bottom surface of the step horn 2 is free and the step horn 2 is slidable in the radial direction (X direction), thereby reducing retention loss.

[Table] Reference numeral 22 denotes a water absorption tank that is set on the partition plate 9 so as to be able to be taken in and out. The upper end of the water absorbing body 21 is fixed to a mounting base 23 attached to the upper surface of the casing 8 with a cover 25 and a positioning pin 26.
The upper end is in contact with the tip of the step horn 2. 24 is a holding means for the water absorbent body 21. The water absorbent body 21 is a body capable of sucking water up to the upper end by capillary action, and is made of, for example, fibrous material. Reference numeral 27 denotes a removable spray mask for use by applying it to local areas of the face, and has a cylindrical spray opening 28 at its bottom facing the tip of the ultrasonic transducer 1. Power supply unit 13, oscillation circuit unit 11, ultrasonic transducer 1, and power switch 12
has a circuit configuration, one of the electrode wires 38 connected to the ultrasonic vibrator 1 is soldered to the electrode at the center of the back of the electrostrictive element 16, and the other lead wire 29 is soldered to the outer peripheral surface of the step horn 2. It is attached.
When the power switch 12 is turned on, the high frequency voltage generated from the oscillation circuit section 11 is transferred to the electrode wire 3.
One is applied directly to the electrostrictive element 16 through 8,
The other voltage is applied to the electrostrictive element 16 via the step horn 2 and the conductive adhesive. The ultrasonic vibrations generated by the electrostrictive element 16 vibrate together with the step horn 2, and the spray surface at the tip of the step horn 2 is greatly vibrated due to the amplitude expanding action of the step horn 2. Since the water absorbing body 21 supplies water in the water supply tank 22 to the spray surface of the step horn 2 by capillary action, the supplied water is atomized into fine particles by vibration and sprayed forward through the spray opening 28. It will be done. FIG. 10 shows another embodiment of the present invention, in which a vibration-proofing rubber 4a serving as a vibration-proofing elastic body 4 is extended in the radial direction and also serves as a waterproof device. As a result, the number of parts can be reduced, and the properties of the anti-vibration rubber 4a due to the water-tight press are not deteriorated, and the anti-vibration effect can be maintained, so that the electric power required for spraying can be reduced. In the figure, 30 is a holding plate, 31 is a cap, 32 is a seal rubber, 33 is an accent ring, 34 is a bottom cover, 35 is a printed board, 36 is a waterproof crushing part, 37 is a waterproof rubber, 29
is the lead wire. As explained above, since the holding structure for the ultrasonic vibrator of the liquid sprayer of the present invention employs a step horn, the amplitude expansion rate is large, and the holding structure is provided near the vibration nodes on the outer periphery of the step horn. A groove is provided, a vibration isolating elastic body is press-fitted into this holding groove, a recess is provided on the outer periphery of the vibration isolating elastic body, and a convex portion provided on the inner periphery of the retaining ring is fitted into this recess. This ensures that the step horn is held securely.Furthermore, the convex part on the outer circumference of the retaining ring is held in the concave part on the outer circumference of the vibration isolating elastic body, and the step horn is clamped and fixed in the axial direction of the retaining ring. Since they are fitted so as to be slidable in the radial direction, it is possible to eliminate retention loss due to vibration in the radial direction.

[Brief explanation of the drawing]

1a, b, and c are front views showing various vibrating cones, FIG. 2 is a cross-sectional view showing an example of a liquid sprayer constructed using an embodiment of the present invention, and FIG. 4 is a partial front view of the embodiment shown in FIG. 2, FIG. 5a is a plan view showing the vibration-proof elastic body, and FIG. An X-ray cross-sectional view, FIG. 6 is a perspective view showing the holding ring, FIG. 7 is a plan view of the embodiment shown in FIG. 2, and FIG. FIG. 9 is a cross-sectional view showing the fitted state of the vibration-proof elastic body and the retaining ring. FIG. 10 is a cross-sectional view of main parts showing another embodiment of the present invention. child, 2
3 is a step horn, 3 is a holding groove, 4 is an elastic body for vibration isolation, 5 is a recess, 6 is a holding ring, 7 is a convex portion, and 8 is a casing.

Claims (1)

[Claims] 1. A holding groove is provided in the vicinity of the vibration node on the outer periphery of the step horn of the ultrasonic vibrator, and a vibration isolating elastic body is press-fitted into the holding groove. A recess is provided on the outer periphery, and a protrusion provided on the inner periphery of the retaining ring is fitted into the recess to clamp and fix the step horn to the retaining ring in its axial direction, while also allowing it to slide freely in its radial direction. A holding structure for an ultrasonic vibrator of a liquid sprayer, characterized in that this holding ring is supported within a casing. 2. The holding structure for an ultrasonic vibrator of a liquid sprayer according to claim 1, characterized in that the vibration-proofing elastic body extends in the radial direction to serve also as waterproofing.