JPH0628209Y2 - Ultrasonic atomizer - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to an ultrasonic atomizer that atomizes liquids such as water and kerosene by utilizing ultrasonic vibration, and especially to homogenize atomized particles. The present invention relates to the improvement of the structure of the ultrasonic atomizer aiming at the above.

(Prior Art) In the Japanese Patent Application No. 61-309113, the present applicant has proposed an ultrasonic pump for pumping and atomizing a liquid by utilizing the structure of a Langevin type vibrating body which is bolted. FIG. 4 shows the basic structure of an ultrasonic atomizer utilizing the structure of the ultrasonic pump as shown in Japanese Patent Application No. 61-309113.

In FIG. 4, the ultrasonic atomizer has a Langevin-type vibrating body structure that operates with water (or liquid) as a load and has both a pumping action and an atomizing action. That is, the metal shaft body 1 as an ultrasonic vibrating body is
Each has a through hole (which serves as a liquid supply hole) 6 as a liquid suction passage, and a disk-shaped portion 5 for a pump function at a lower portion.
Is formed, and an amplitude increasing horn portion 20 and a disc-shaped portion 21 for the atomization function are provided on the upper part. Shaft 1
The intermediate portion of is a bolt shape, and male screw portions 2 and 3 are formed. The lower opening of the through hole 6 is located at the center of the lower end surface of the shaft body 1 (that is, the lower end surface of the disc-shaped portion 5), and the upper opening is the upper end surface of the shaft body 1 (that is, the disc-shaped portion 21). Located in the center of.

Then, the ring-shaped washer 8, the ring-shaped electrode plate 9A,
The ring-shaped piezoelectric element 10A, the ring-shaped electrode plate 9B, the ring-shaped piezoelectric element 10B, the ring-shaped electrode plate 9C, the ring-shaped washer 12 and the disc spring 13 are inserted, and the male screw portions 2 and 3 of the shaft body 1 are inserted.
The nuts 11A and 11B are screwed into and screwed to the shafts 1, whereby the members such as the piezoelectric elements 10A and 10B are screwed and integrated with the shaft body 1. That is, the piezoelectric element 10
The relationship between A and 10B and the shaft 1 is almost the same as that of the bolted Langevin type vibrator.

One electrode surface of each piezoelectric element 10A, 10B is connected to the intermediate electrode plate 9B, and the other electrode surface is connected to the electrode plates 9A, 9C on both sides.

In such an ultrasonic atomizer, when the lower disk-shaped portion 5 is immersed in a liquid P such as water, if a high frequency voltage is applied between the electrode plates 9B and 9A, 9C, the piezoelectric element 10A , 10B
Generates ultrasonic vibrations (for example, thickness vibrations), and the vibrations are magnified at the lower part of the shaft body 1 and the longitudinal vibrations of the ultrasonic waves magnified by the disk-shaped portion 5 at the lower end (as indicated by arrow R in FIG. 4). Vibration in a direction parallel to the axis. Disc-shaped part 5 at the lower end of this shaft
The vertical vibration causes a flow in the direction of blowing up the through-hole 6 that serves as a liquid suction passage, as shown by the arrow S. Along with this, a liquid such as water has a property that ultrasonic waves are more likely to propagate than air and have high viscosity. Therefore, the liquid in the liquid sucking through-hole 6 advances in the direction in which the ultrasonic vibrations rise, and the liquid that has risen in the liquid sucking through-hole 6 is caused by the respiratory action that the inner surface of the through-hole 6 contracts. Is atomized by ultrasonic vibration of the upper end surface of the disk-shaped portion 21 located at the upper opening thereof, and becomes atomized particles (spray particles) and is scattered into the atmosphere.

(Problems to be solved by the invention) By the way, the ultrasonic atomizer having the basic structure shown in FIG. 4 is used for atomizing and draining drainage drainage from an air conditioner or a refrigerator, or atomizing liquid fuel. Although it has been considered by the present applicant to utilize it, in such a case, it is necessary to reduce the variation in particle size and prevent the generation of large particles so that the atomized particles are easily vaporized and vaporized. is there. However, in the basic structure of FIG. 4, one through hole 6 having a relatively large inner diameter corresponding to the required atomization amount is provided as the liquid suction passage, and the atomization by the disc-shaped portion 21 is performed. Large liquid particles may be scattered directly from the through hole 6 without receiving, or the disc-shaped portion 2
There was an unavoidable disagreement that liquid particles once atomized in No. 1 were secondary aggregated to become large particles.

An object of the present invention is to provide an ultrasonic atomizer capable of eliminating the above-mentioned drawbacks and generating uniform atomized particles.

(Means for Solving the Problems) The present invention configures an ultrasonic vibrating body having a plurality of liquid suction passages in which a plurality of hollow thin tubes are bundled at a portion excluding an upper end portion and a lower end opening is immersed in a liquid. , A structure in which a sleeve is fixed at an intermediate position on the outer circumference of the ultrasonic vibrating body, and a plurality of annular piezoelectric elements are inserted on the outer circumference of the sleeve and tightened integrally by tightening means to solve the above conventional problems. is doing.

(Operation) The ultrasonic atomizer of the present invention employs an ultrasonic vibrating body having a plurality of liquid suction passages in which a plurality of hollow thin tubes are bound together in a portion excluding the upper end portion and the lower end opening is immersed in the liquid. Therefore, the opening of each liquid suction passage may be sufficiently small as compared with the conventional case where one through hole is used as the liquid suction passage, and scattering of large-diameter liquid particles can be prevented. Moreover, since the upper ends of the hollow capillaries are not bound and are free, it is possible to freely vibrate each hollow capillaries and to reduce the rate of secondary aggregation of atomized particles from adjacent hollow capillaries. Moreover, the sum of the liquid suction amounts of the respective liquid suction passages becomes the atomization amount, and a sufficient atomization amount can be obtained.

Embodiment An embodiment of the ultrasonic atomizer according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. In this figure,
An ultrasonic vibrating body having a plurality of liquid suction passages has a structure in which a large number of thin hollow thin tubes 30 serving as a core material are bundled and integrated, and a bolt sleeve 31 is fitted and fixed at an intermediate position. Here, a large number of hollow thin tubes 30
Is a metal pipe such as stainless steel (for example, a diameter of 0.5 mm), and the integration of the hollow thin tubes 30 into a bundle is performed by welding such as brazing in all the remaining portions except the upper end portion U for atomization. In order to prevent each hollow thin tube 30 from being displaced in the axial direction. Further, the bolt sleeve 31 can be fixed to the bundled hollow thin tubes 30 by welding such as brazing. The material of the bolt sleeve 31 is the same metal as the hollow thin tube 30, such as stainless steel.

Then, using the male screw portions 2 and 3 of the bolt sleeve 31, the piezoelectric elements 10A and 10B are fastened and integrated. That is, the ring-shaped washer 8, the ring-shaped electrode plate 9A, the ring-shaped piezoelectric element 10A, and the ring-shaped electrode plate 9 are provided on the outer circumference of the bolt sleeve.
B, the ring-shaped piezoelectric element 10B, the ring-shaped electrode plate 9C, and the ring-shaped washer 12 are inserted and the nuts 11 are attached to the male screw portions 2 and 3.
Screw A and 11B together and tighten.

In the configuration of the first embodiment of FIG. 1, when the lower parts of the bundled hollow thin tubes 30 are immersed in the liquid P such as water, if a high frequency voltage is applied between the electrode plates 9B and 9A, 9C. The piezoelectric elements 10A and 10B generate ultrasonic vibrations (for example, thickness vibrations), and liquid is sucked up inside each hollow thin tube 30 based on the operation principle substantially similar to the basic structure of FIG. Reach the top opening of 30. Since the upper end portion U of each hollow thin tube 30 (preferably the section from the upper end opening to the nearest vibration node) is not bound so as to be freely vibrated and is free, the upper end opening of the hollow thin tube 30 is The reached liquid is atomized by the ultrasonic vibration of the upper end opening, and is dispersed as substantially uniform particles. Here, since the upper end portion of each hollow thin tube 30 can vibrate independently, it is possible to reduce the rate of secondary aggregation of particles emitted from the openings of the adjacent hollow thin tubes 30.

The ultrasonic atomizer of FIG. 1 can be supported by using the washer 8 or 12, for example.

FIG. 2 shows a second embodiment of the present invention. In this figure,
A large number of thin hollow thin tubes 30 serving as a core material are bundled, a bolt sleeve 31 is fitted, and the hollow thin tubes 30 are welded to the inner portion of the bolt sleeve 31 by brazing or the like. The thin tubes 30 are brought into close contact with each other and tightened to be integrated with each other. Here, the upper and lower sleeves 35 and 36 are made of metal such as stainless steel, like the bolt sleeves. Then, the bolt sleeve 31 and the upper and lower sleeves 35 and 36 are welded together by brazing or the like. However, the upper end portion U for atomizing the hollow thin tube 30 is a free portion that is not bound.

In addition, the piezoelectric elements 10A and 10B are attached to the bolt sleeve 31.
The tightening and unifying are the same as in the case of FIG. Also,
If the hollow thin tube 30 of the inner portion of the bolt sleeve 31 can be tightly tightened, welding of the inner portion of the bolt sleeve 31 can be omitted.

In the case of the second embodiment shown in FIG. 2, a large number of hollow thin tubes 30 can be bound together by tightening the upper and lower sleeves 35 and 36, and the portion where the hollow thin tubes 30 are welded can be minimized. .

FIG. 3 shows a third embodiment of the present invention. In this case, the air introduction pipe 3 is provided at the center of a large number of thin hollow thin tubes 30 serving as core materials.
7, the bolt sleeve 31, the upper sleeve 35, and the lower sleeve 36 are provided in the same manner as in FIG. 2, so that a large number of hollow thin tubes 30 and air introduction tubes 37 are bound and integrated. Here, the air introduction pipe 37 is a metal pipe such as stainless steel similar to the hollow thin pipe 30, is shorter than the hollow thin pipe 30, and has a lower end opening above the liquid surface even when the lower portion of the hollow thin pipe 30 is immersed in the liquid. I am trying to become. Also, the lower sleeve 3
An air introduction hole 38 is formed on the side surface of 6. In addition,
The fastening of the piezoelectric elements 10A and 10B to the bolt sleeve 31 is the same as in the case of FIG.

In the configuration of the third embodiment of FIG. 3, air can be introduced upward through the air introduction hole 38 and the air introduction pipe 37 at the same time as the liquid is atomized, and the liquid fuel such as gasoline is mixed with the air at the same time. Suitable for use in

(Effect of Device) As described above, according to the ultrasonic atomizer of the present invention,
An ultrasonic vibrating body having a plurality of liquid suction passages whose lower end openings are submerged in the liquid is formed by bundling a plurality of hollow thin tubes at a portion excluding the upper end portion, and a sleeve is provided at an intermediate position on the outer circumference of the ultrasonic vibrating body. Since a plurality of piezoelectric elements are fastened to and integrated with the outer circumference of the sleeve, the openings of the individual liquid suction passages can be made sufficiently small, and the upper end of each hollow thin tube can freely vibrate. Thus, secondary aggregation of atomized particles can be prevented, large liquid particles can be prevented from being released, and a large amount of uniform atomized particles can be generated.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of an ultrasonic atomizer according to the present invention, FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention, and FIG. 3 is a third embodiment of the present invention. FIG. 4 is a vertical cross-sectional view of the embodiment, and FIG. 4 is a vertical cross-sectional view showing the basic configuration of an ultrasonic atomizer having a pump function, which the applicant of the present invention has previously proposed. 1 ... Shaft, 2, 3 ... Male screw part, 10A, 10B ...
Piezoelectric element, 11A, 11B ... Nut, 30 ... Hollow thin tube, 31 ... Bolt sleeve, 35, 36 ... Sleeve.

Claims (1)

[Scope of utility model registration request] 1. An ultrasonic vibrating body having a plurality of passages for sucking up a liquid, the lower end opening of which is bound together in a portion excluding the upper end portion, and the outer periphery of the ultrasonic vibrating body. An ultrasonic atomizer characterized in that a sleeve is fixed at an intermediate position, and a plurality of annular piezoelectric elements are placed on the outer periphery of the sleeve and integrated by tightening means.