JPH0699105A - Atomizing nozzle - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a practical simple jet atomizing nozzle that can atomize into fine particles and has excellent pressure resistance of liquid. [Structure] A flat plate 7 is adhered to a substrate 6 having fine linear grooves 4 processed to a depth of a few tens of microns by a disc-shaped diamond cutter having a width of about 10 microns to provide a liquid flow path. There is. By sufficiently increasing the length of the groove portion 4 in the longitudinal direction, the pressure resistance against the pressurized liquid can be improved even if the groove portion 4 has a rectangular shape of 10's of microns.
Even with fine ejection holes, practical strength can be guaranteed and atomized into fine particles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle of an atomizing device for atomizing water, liquid fuel, chemical solution, etc., and is used for a humidifier, medical equipment for atomizing chemicals, combustion equipment and the like.

[0002]

2. Description of the Related Art In a conventional jet type in a conventional atomizer, a pressurized liquid is ejected in a cylindrical shape from an ejection hole 2 provided in an end face portion 1 of a nozzle as shown in FIG. The difference in speed causes turbulence on the surface of the cylinder, and the particles 3 are divided. This particle size is expressed by (Equation 1) according to Rayleigh's instability principle.

[0003]

[Equation 1]

Here, Dn is the diameter of the ejection hole, which is atomized with a particle diameter corresponding to the diameter of the ejection hole. If fine particles are to be obtained, the diameter of the ejection hole may be obtained by fine machining such as electric discharge machining. Had to be as small as possible.

[0005]

However, in the above-mentioned conventional structure, since the end face portion 1 is provided with the ejection hole 2, the minimum ejection hole diameter is about 1/4 of the plate thickness due to processing restrictions. In order to reduce the above, the plate thickness of the end face portion 1 must be thinned to about several tens of microns, so that there is a problem that the pressure resistance is lowered and the liquid pressure for ejecting the liquid cannot be made high.

Further, if the number of the ejection holes 2 is increased in order to increase the atomization amount, the pressure resistance of the end face portion 1 is further lowered, and there is a problem that it cannot be put to practical use.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a practical simple jet atomizing nozzle which can atomize extremely small particles and is excellent in pressure resistance of liquid. Is.

[0008]

In order to achieve the above object, the present invention is, in the first technical means, a substrate on which a fine linear groove portion is provided on a plane, and a substrate on which the groove portion is provided is fixed to the substrate. And a supply path for supplying a liquid to the groove.

A second technical means of the present invention is to provide a lower plate having a plurality of fine linear grooves on the same plane and a plurality of fine linear grooves on the same plane. An upper plate fixed to a flat surface provided with a groove portion of the plate and a supply path for supplying a liquid to the groove portion are provided.

[0010]

According to the present invention, according to the above structure, in the first technical means, the pressurized liquid supplied from the supply passage is ejected from the downstream end through the liquid passage formed in the longitudinal direction of the groove portion and the flat plate of the substrate. However, the surface tension of the liquid transforms it into a column of equal diameter at the cross section of the groove, and the turbulence generated on the surface of the cylinder due to the relative velocity difference with the surroundings causes it to be divided into fine particles corresponding to the cross section of the groove and the length of the groove. By making the length in the direction sufficiently long, the pressure resistance against the pressurized liquid can be improved regardless of the size of the groove, so that practical strength can be assured even with minute grooves and atomization into fine particles is possible. .

In the second technical means of the present invention, the pressurized liquid supplied from the supply passage passes through a plurality of liquid flow paths formed in the longitudinal direction of the lower groove portion of the lower plate and the upper groove portion of the upper plate. Ejected from the downstream end, the surface tension of the liquid transforms it into a cylinder of equal diameter in the groove cross section, and due to the turbulence generated on the cylindrical surface due to the relative velocity difference with the surroundings, it is divided into fine particles corresponding to the groove cross section, and By sufficiently increasing the length of the groove portion in the longitudinal direction, the pressure resistance against the pressurized liquid can be improved regardless of the size of the groove portion, so that even if the groove portion is fine, the practical strength can be assured. Can be atomized into Further, since the groove is provided in each of the lower plate and the upper plate, it is possible to provide the liquid flow paths with a density twice maximum as compared with the case where the groove is provided only on one side, so that atomization can be performed at a large flow rate.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the nozzle in the atomizing device of the present invention will be described below with reference to FIGS. 1 and 2
In the figure, 4 is a fine linear groove processed to a depth of a few tens of microns by a disk-shaped diamond cutter with a width of about 10 microns, which is a hard material that communicates with the supply path 5 having a concave cross section. It is provided on the upper surface of the end portion of the substrate 6 of the material. The flat plate 7 made of glass is adhered to the surface having the groove portion 4 by electrostatic welding so as to close the groove portion 4 and the supply passage 5, and constitutes individual liquid flow passages as ejection holes.

In the above structure, the liquid supplied to the supply passage 5 is filled in the supply passage 5 to have a predetermined liquid pressure, and the groove portion 4 is formed.
Through the downstream end of the groove, and the surface tension of the liquid deforms the cross section of the groove 4 into a cylinder of equal diameter, and the turbulence generated on the surface of the cylinder due to the relative speed difference with the surroundings corresponds to the cross section of the groove 4. It is divided into fine particles. By making the length of the groove portion 4 in the longitudinal direction sufficiently long, the groove portion 4 becomes 1
Even if it is a rectangle of 0 to several microns, the pressure resistance against the pressurized liquid can be improved, and even if it is a fine ejection hole, the practical strength can be guaranteed, so that it can be atomized into fine particles.

A second embodiment of the present invention will be described with reference to FIGS. 3 and 4. 3 and 4, 8 is a width 10
An end of the lower plate 10 of a silicon material, which is a hard material, is a fine linear lower groove portion machined to a depth of a few dozen microns by a disk-shaped diamond cutter of about micron and communicates with a supply passage 9 having a concave cross section. A plurality of parts are provided at equal intervals on the upper surface of the part. The upper plate 11 is formed in the same shape as the lower plate 10 by shifting the position of the upper groove portion 12 from the lower groove portion 8 by a half pitch, and the supply passage corresponding to the supply passage 9 is also formed by communicating the upper groove portion 12 with each other. Then, they are adhered to the lower plate 10 by electrostatic welding so as to close the groove portion and the supply passage with each other, and each liquid passage is formed as an ejection hole of the nozzle.

In the above structure, the liquid supplied from the supply passage 9 and pressurized is in the lower groove portion 8 of the lower plate 10 and the upper groove portion 1 of the upper plate.
2 through a plurality of liquid flow paths formed in the longitudinal direction, ejected from the respective downstream ends, and are deformed into a cylindrical shape having an equal diameter of the groove section by the surface tension of the liquid, and a cylindrical shape due to the relative speed difference with the surroundings. Due to the turbulence generated on the surface, it is divided into fine particles corresponding to the cross section of the groove. By sufficiently increasing the length in the longitudinal direction of the groove portion, the pressure resistance against the pressurized liquid can be improved even if the groove portion is a rectangle of 10's of microns, so that practical strength can be guaranteed even with a minute groove portion. , Can be atomized into fine particles. Further, since the groove is provided in each of the lower plate and the upper plate, it is possible to provide the liquid flow passage with a density twice as high as that in the case where the groove is provided only in one of the lower plate and the upper plate. Can be converted.

Although each groove in the first and second embodiments has a rectangular shape, it may have a semicircular shape. The groove length is about 20 to 50 times the groove depth. Further, the groove portion and the supply passage of the nozzle are integrally formed on one substrate, but after the substrate having the groove portion of the nozzle and the flat plate are fixed, they are integrated with the member having the supply passage processed separately. Good.

[0017]

As described above, according to the atomizing nozzle of claim 1 of the present invention, the liquid ejected from the downstream end of the groove portion is disturbed by the turbulence caused by the relative speed difference with the surroundings.
It is possible to improve the pressure resistance against the pressurized liquid regardless of the size of the groove by dividing it into fine particles corresponding to the groove cross section and making the longitudinal length of the groove sufficiently long. Even if it exists, it can guarantee practical strength and can be atomized into fine particles.

According to the second aspect of the present invention, since the lower plate and the upper plate are provided with the groove portions and the surfaces having the groove portions are adhered to each other, the maximum density is twice that of the case where only one plate is provided with the groove portions. Can provide a liquid flow path, and the liquid ejected from the downstream ends of the plurality of grooves can be atomized at a large flow rate because the liquid is divided into fine particles corresponding to the groove section.

[Brief description of drawings]

FIG. 1 is a perspective view of an atomizing nozzle according to an embodiment of the present invention.

FIG. 2 is a sectional view of the nozzle.

FIG. 3 is a perspective view of an atomizing nozzle according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a lower concave plate of the nozzle.

FIG. 5 is a sectional view of a conventional simple jet nozzle.

[Explanation of symbols]

 4 Grooves 5 Supply Path 6 Substrate 7 Flat Plate 8 Lower Groove 9 Supply Path 10 Lower Plate 11 Upper Plate 12 Upper Groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiko Uno 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. An atomization nozzle comprising a substrate having fine linear grooves formed on a plane, a flat plate fixed to the plane having the grooves of the substrate, and a supply path for supplying a liquid to the groove. 2. A lower plate having a plurality of fine linear grooves provided on the same plane, and a plurality of fine linear grooves provided on the same plane, and a flat plate provided with the groove portions of the lower plate. An atomizing nozzle comprising a fixed upper plate and a supply path for supplying a liquid to the groove.