JPH0539677U - Liquid absorption type ultrasonic atomizer - Google Patents

Abstract

(57) [Summary] [Purpose] By devising the structure of the liquid suction through hole of the liquid absorption ultrasonic transducer, the fluctuation of the liquid absorption amount due to the fluctuation of the liquid level of the liquid is mitigated, and stable atomization operation is achieved. To achieve. [Structure] A mesh plate 10 having a large number of minute through holes is arranged on the atomizing end side of a liquid absorption type ultrasonic transducer 31 in which piezoelectric elements 4A and 4B are fastened integrally with a shaft body 33, and the liquid absorption is performed. The lower end portion of the liquid suction through-hole 32 of the ultrasonic ultrasonic transducer 31 is formed with a large-diameter opening hole portion 40 and a taper hole portion 4 following the large-diameter opening hole portion
It is characterized by being configured with 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a liquid absorption type ultrasonic atomizer that can be used as various atomizers such as an atomizer atomizer, an aromatic atomizer, a facial atomizer, and a fuel atomizer.

[0002]

[Prior Art]

 Conventionally, in Japanese Utility Model Application Laid-Open No. 64-28981, a mesh plate having a large number of minute through holes is arranged on the atomizing end side of a liquid absorption type ultrasonic transducer, and the liquid absorption type ultrasonic transducer absorbs liquid. A configuration has been proposed in which the liquid is atomized on the upper end surface (atomization surface) side of the liquid absorption ultrasonic transducer.

FIG. 7 shows a main configuration of a conventional ultrasonic atomizing device, that is, a liquid absorption type ultrasonic transducer and a mesh plate on the atomizing end side thereof (however, the oscillator and the mesh plate are not shown). The support structure is omitted.) In this figure, a liquid absorption type ultrasonic transducer 1 has a disc-shaped piezoelectric element with a hole on a shaft body 3 in which a through hole 2 for sucking up a liquid is formed in a central portion and a male screw portion is engraved in an intermediate portion. 4A and 4B are inserted, and the nut 6 is screwed into the male screw portion through the washer 5 to integrally tighten the nut. That is, the relationship between the piezoelectric elements 4A and 4B and the shaft body 3 is substantially the same as that of the bolt tightening vibrator. Here, as shown in FIG. 8, the shaft body 3 has a flanged liquid absorption horn portion 7 for a liquid absorption function at a lower portion, and the shaft body upper portion is an atomization horn portion 8 for an atomization function, The lower end of the liquid sucking through hole 2 opens at the center of the lower end surface of the flange 15 of the liquid absorbing horn portion 7, and the liquid sucking portion is formed at the center of the upper end surface (atomizing surface) of the atomizing horn portion 8. The upper end of the through hole 2 is open. The inner diameter of the liquid suction through-hole 2 is uniform over the entire length. The mesh plate 10 is a thin metal plate made of stainless steel or the like having a large number of minute through holes of about several tens of μm to several tens of μm. It is supported by a support structure such as a case that supports the child 1. At this time, the positional relationship between the mesh plate 10 and the atomizing surface of the atomizing horn portion 8 may spread over the entire upper surface of the atomizing horn portion when the liquid 70 such as water is sucked up. It is desirable that they should face each other or be in slight contact with each other with a minute gap as much as possible.

[0004]

[Problems to be solved by the device]

 By the way, in the conventional configuration of FIG. 7, the liquid absorption type ultrasonic transducer 1 absorbs liquid from the liquid absorption port which is the lower opening of the liquid suction through hole 2 having the inner diameter as shown in FIG. The liquid that has reached the upper end surface of the chemical horn portion 8 and that has further entered the many minute through holes of the mesh plate 10 is sprayed into the air as fine particles by ultrasonic vibration, as will be described in detail below. There is a problem in that the liquid absorbing power greatly changes depending on the water level of the liquid.

FIG. 9 shows changes in the liquid absorption state of the liquid absorption type ultrasonic transducer 1 (however, when the mesh plate 10 is removed), (A) shows the upper end surface of the shaft body 3, that is, the fog. The liquid 70 on the atomization surface is in a state in which the liquid 70 is jetted out from the upper opening of the through hole 2 for sucking up, and the liquid absorption amount is excessive in the application of the liquid absorption type ultrasonic atomizer as described later. .. (B) is a state in which the liquid 70 overflows in the form of polka dots from the upper opening of the liquid suction through-hole 2 and drips along the shaft 3, as will be described later. Then, the liquid absorption amount is within a suitable range. (C) is a state in which the liquid 70 overflowing from the upper opening of the liquid suction through-hole 2 remains in the form of polka dots on the atomizing surface of the shaft body 3 (a state in which it does not drip along the shaft body 3), which will be described later. As described above, the liquid absorption amount is within a suitable range for the use of the liquid absorption type ultrasonic atomizer. (D) is a liquid-absorption impossible state in which liquid absorption by the liquid-absorption ultrasonic vibrator is not performed at all.

FIG. 10 shows the relationship between the liquid absorbing horn portion 7 of the liquid absorbing ultrasonic transducer 1 and the water level (depth) of the liquid 70 in which the liquid absorbing horn portion 7 is immersed. , Is shallow.

Tables 1 and 2 below show the relationship between the water level in FIG. 10 and the liquid absorption state in FIG. 9 in the conventional liquid absorption type ultrasonic transducer 1, and Table 1 shows the liquid absorption type ultrasonic transducer. Table 2 shows a state in which the input power to the liquid absorption type ultrasonic transducer 1 is large and Table 2 shows a state in which the input power to the liquid absorption type ultrasonic transducer 1 is large. Table 1 Water level Liquid absorption state (B) or (C) (D) (B) or (C) Table 2 Water level Liquid absorption state (A) or (B) (C) or (D) (A) or (B)

As is clear from Table 1 above, when the input power to the liquid-absorption ultrasonic transducer 1 is small, at the water level in FIG. 10, that is, at the intermediate water level, ), The liquid cannot be absorbed, and the atomization operation becomes impossible. Further, as is clear from Table 2, when the input power to the liquid-absorption ultrasonic transducer 1 is large, the water level in FIG. 10, that is, the fountain in FIG. 9A when the water level is deep and shallow. Be in a state. In the fountain state of FIG. 9 (A), the liquid absorption amount becomes excessive, and when the mesh plate 10 is arranged at the atomizing end of the liquid absorption type ultrasonic transducer 1 of FIG. 7, the phantom line W of FIG. As described above, a phenomenon occurs in which the excess liquid 70 that is not atomized drips one after another. This phenomenon becomes a problem when the expensive drug is atomized such as an atomizer for an inhaler, and the drug is wasted. The treatment of the liquid 70 is a problem. In addition, in the states (B) and (C) of FIG. 9, when the liquid absorption type ultrasonic transducer 1 of FIG. It was found that the amounts were balanced and the above-mentioned liquid dropping phenomenon did not occur.

As described above, the conventional liquid absorption type ultrasonic transducer 1 having the through hole 2 for sucking the liquid having a uniform inner diameter and the mesh plate 10 are combined to obtain a constant input power. When the sound wave is applied to the oscillator 1, there is a problem in that the liquid cannot be absorbed or the amount of liquid absorbed is too large to cause the dropping of excess liquid due to the change in the liquid level.

In order to solve this problem, the inventor of the present invention, as shown in FIG. 11, has a liquid suction through hole 22 in which the lower opening is wider than the upper opening and the inner diameter is changed into a gentle taper shape. A similar experiment was conducted using a liquid-absorption ultrasonic transducer 21 having the following (however, the same as the ultrasonic transducer 1 except for the through holes 22) and changing the water level as shown in FIG. However, the experimental results are shown in Tables 1 and 2, and no particular improvement effect was observed.

Further, the present inventor formed a tapered hole portion 23 at the lower end portion of the liquid suction through hole 2 having a uniform inner diameter of the conventional liquid absorption type ultrasonic transducer 1 as shown in FIG. A similar experiment was conducted by using a structure in which the lower opening 24 serving as the liquid port is widened and changing the water level as shown in FIG. However, the experimental results are shown in Tables 1 and 2, and no improvement effect was observed. Moreover, the result was the same even if the diameter of the tapered hole was increased as indicated by the phantom lines 23A and 23B.

In view of the above points, the present invention mitigates the fluctuation of the liquid absorption amount due to the fluctuation of the liquid level by devising the structure of the liquid suction through hole of the liquid absorption type ultrasonic transducer, Furthermore, it aims at providing the liquid absorption type ultrasonic atomization device which achieved the stable atomization operation.

[0013]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a liquid-absorption ultrasonic atomizer in which a mesh plate having a large number of minute through holes is arranged at the atomization end side of a liquid-absorption ultrasonic transducer. The lower end portion of the liquid suction through hole of the liquid ultrasonic transducer is composed of a large-diameter opening hole portion and a taper hole portion that follows the opening portion.

[0014]

In the liquid absorption type ultrasonic atomizing device of the present invention, the lower end portion of the liquid suction through hole of the liquid absorption type ultrasonic transducer is formed with a large-diameter opening hole portion and a taper hole portion following the large diameter opening hole portion. By configuring with, it is possible to eliminate the inability to absorb liquid at the intermediate water level, at which the liquid absorption action becomes weakest, and to prevent the phenomenon that the liquid absorption amount becomes excessive when the water level is low and when it is high. You can Therefore, when the mesh plate is arranged on the atomizing end side of the liquid absorption type ultrasonic transducer, it is possible to prevent the phenomenon in which the excessively sucked liquid is dropped without being atomized.

[0015]

【Example】

 Hereinafter, an embodiment of a liquid absorption type ultrasonic atomizing device according to the present invention will be described with reference to the drawings.

A first embodiment of the present invention will be described with reference to FIG. In the figure, reference numeral 31 is a liquid absorption type ultrasonic transducer, and a disk-shaped piezoelectric element with a hole is formed on a shaft body 33 having a through hole 32 for sucking up a liquid formed in the central portion and a male screw portion engraved in the middle portion. 4A and 4B are inserted, and a nut 6 is screwed into the male screw portion via a washer 5 so as to be integrally tightened. Here, as shown in FIG. 2, the lower end portion of the liquid sucking through hole 32 is a large-diameter opening hole portion which is opened to the lower end surface of the flanged liquid absorbing horn portion 7 (the lower end surface of the circular flange 15). 40 and a taper hole portion 41 following this. The large-diameter opening hole 40 maintains the same inner diameter over the length dimension L as shown in FIG. 2, and the small diameter which forms the remaining portion of the liquid suction through-hole 32 through the tapered hole portion 41 having a gradually narrowing inner diameter. It is connected to the hole 42. The liquid absorption type ultrasonic transducer 31 is similar to the liquid absorption type ultrasonic transducer 1 of FIG. 7 except for the structure of the liquid suction through-hole, and the same portions are denoted by the same reference numerals.

A metal or resin waterproof case 50 that surrounds the outer circumferences of the piezoelectric elements 4A and 4B is arranged around the liquid-absorption ultrasonic transducer 31 described above. The waterproof case 50 is formed by fastening half cases 50A and 50B together with bolts 51 and nuts 52, an O-ring 53 between the half cases 50A and 50B, and an O between the half cases 50A and 50B and the washer 5. They are each watertightly closed by a ring 54.

The mesh plate 10 (for example, a thin metal plate made of stainless steel or the like) having a large number of minute through holes of about several tens of μm to several tens of μm is stretched around the through holes 56 of the support plate 55 and an adhesive is applied to the periphery. The support plate 55 is fixed to the extension portion (which functions as a support) of the bolt 51 used for tightening the waterproof case 50 with a nut 57. At this time, the positional relationship between the mesh plate 10 and the upper end surface of the atomizing horn portion of the liquid-absorption ultrasonic transducer 31 allows the liquid 70 such as water to spread over the entire upper end surface of the atomizing horn portion. Thus, it is desirable that the gaps face each other or make slight contact with each other.

The container 60 is filled with a liquid 70 such as water, and the liquid absorbing ultrasonic transducer 31 is supported on the container 60 so that the liquid absorbing horn portion 7 is immersed in the liquid 70. Here, the liquid absorption type ultrasonic transducer 31 is supported by the flange portion 50C of the waterproof case 50 engaging with the container edge.

FIG. 3 shows the liquid absorption type ultrasonic transducer 31 used in the first embodiment, and the water level of the liquid absorption horn portion 7 immersed in the liquid 70 of the liquid absorption type ultrasonic transducer 31. Was set to a deep state, an intermediate depth, and a shallow state, and a liquid absorption state was experimentally confirmed by applying a constant input power (however, there is no mesh plate 10), regardless of the water level fluctuation. 9 also became the states (B) and (C) of FIG. 9, and neither the phenomenon of the liquid spouting like a fountain nor the occurrence of the liquid-absorption state was observed. Further, it was found that the states of (B) and (C) of FIG. 9 are maintained stable even if the input power is increased or decreased to some extent. As shown in FIG. 2, such stabilization of the liquid absorption amount is achieved by sucking up the liquid with the large-diameter opening hole portion 40 opened at the lower end surface of the liquid absorption horn portion 7 and the taper hole portion 41 subsequent thereto. It is considered that this is due to the fact that the lower end portion of the through hole for use 32 is formed. Therefore, by disposing the mesh plate 10 on the atomizing end side of the atomizing horn portion of the liquid absorption type ultrasonic transducer 31 as in the configuration of FIG. 4 in which the main components of the first embodiment are extracted. Since the liquid can be atomized and the liquid absorption amount is appropriate, the extra liquid 70 dripping phenomenon that occurs in the case of the conventional liquid absorption type ultrasonic transducer 1 as shown by the phantom line W in FIG. 7 does not occur. ..

As described above, according to the configuration of the first embodiment, water or the like that has risen in the liquid suction through-hole 32 due to ultrasonic vibration of the liquid absorption horn portion 7 of the liquid absorption ultrasonic transducer 31 The liquid 70 overflows from the upper end opening and spreads over the entire atomization surface through a minute gap formed between the atomization surface of the atomization horn portion 8 and the mesh plate 10, and forms on the mesh plate 10. It enters the inside of each of the minute through holes thus formed, and is ultrasonically vibrated by the atomizing horn portion 8 to become atomized particles, which are sprayed and released into the air. Also, by devising the structure of the lower end part of the liquid suction through-hole 32, fluctuations in the liquid suction amount can be suppressed, stable atomization operation can be realized, and excess liquid that is not atomized is atomized by the horn. It is possible to prevent the phenomenon of dropping through the portion 8 and the occurrence of a liquid-absorption inability (non-atomization) state.

FIG. 5 shows the configuration of the essential parts of the second embodiment of the present invention. In this case, the liquid absorption type ultrasonic transducer 31A is configured such that the lower end portion of the liquid suction through hole 32A is composed of a large-diameter opening hole portion 40A and a taper hole portion 41A following this, and the liquid suction through hole is formed. The small-diameter hole portion 42A forming the remaining portion of 32 A is a gentle taper hole portion having a wide lower end and a narrow upper end. Other structures can be similar to those of the first embodiment. Also in this case, the same effect as that of the above-described first embodiment can be obtained.

In the first and second embodiments, the liquid-absorption ultrasonic transducers 31 and 31A have the flanged liquid-absorption horn 7 formed by integrally forming the circular flange 15 at the lower end. However, as shown in FIG. 6, the flange can be omitted and the liquid absorbing horn portion 80 without a flange can be used. The other parts are configured in the same manner as the liquid absorption type ultrasonic transducer 31 or 31A.

The case structure and support structure of the liquid-absorption ultrasonic transducer, the support structure of the mesh plate, and the like can be appropriately changed according to the application. Also, omit either the upper or lower of the set of washers and nuts for tightening the piezoelectric element to the shaft body, and instead form the piezoelectric element contact member corresponding to the washer and nut on the shaft body as an integrated product. It may be

[0025]

[Effect of the device]

 As described above, according to the liquid absorption type ultrasonic atomizer of the present invention, the liquid level fluctuation of the liquid can be prevented by devising the structure of the lower end portion of the liquid suction through hole of the liquid absorption type ultrasonic transducer. It is possible to reduce fluctuations in the amount of liquid absorption that accompanies it, and to achieve stable atomization operation.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a first embodiment of a liquid absorption type ultrasonic atomizing device according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the first embodiment.

FIG. 3 is a front view with a part in section showing the liquid-absorption ultrasonic transducer used in the first embodiment.

FIG. 4 is a front view with a partial cross section showing the main components of the first embodiment.

FIG. 5 is a partial cross-sectional front view showing the configuration of the main part of the second embodiment of the present invention.

FIG. 6 is an enlarged sectional view of an essential part showing a modified example of the liquid absorbing horn portion of the liquid absorbing ultrasonic transducers according to the first and second embodiments.

FIG. 7 is a partially sectional front view showing an example of a conventional liquid absorption type ultrasonic atomizing device.

FIG. 8 is an enlarged cross-sectional view of a main part of a liquid absorption ultrasonic transducer used in a conventional liquid absorption ultrasonic atomizer.

FIG. 9 is an explanatory diagram showing a liquid absorbing state of the liquid absorbing ultrasonic transducer.

FIG. 10 is an explanatory diagram showing the water level of the liquid in which the liquid absorbing horn of the liquid absorbing ultrasonic transducer is immersed.

FIG. 11 is a front view with a part in section showing a comparative example of a liquid-absorption ultrasonic transducer.

FIG. 12 is an enlarged cross-sectional view of a main part in a case where only a tapered hole portion is formed in a lower end portion of a liquid suction through-hole in a conventional liquid absorption ultrasonic transducer.

[Explanation of symbols]

 1, 21, 31, 31A Liquid absorbing ultrasonic transducer 2, 32, 32A Through hole for sucking liquid 3, 33 Shaft body 4A, 4B Piezoelectric element 7 Liquid absorbing horn portion 8 Atomizing horn portion 10 Mesh plate 40,40A Large opening hole 41,41A Tapered hole 42,42A Small hole 50 Waterproof case

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F02M 27/08 B 7114-3G

Claims (1)

[Scope of utility model registration request] 1. A liquid absorption type ultrasonic atomizer in which a mesh plate having a large number of minute through holes is arranged on the atomization end side of the liquid absorption type ultrasonic vibrator, wherein A liquid-absorption ultrasonic atomizer characterized in that a lower end portion of the liquid suction through hole is composed of a large-diameter opening hole portion and a taper hole portion following the large-diameter opening hole portion.