JPS62117655A - Ultrasonic atomizer - Google Patents

Abstract

PURPOSE:To stably atomize a liq., to pulverize the particle and to uniformize the atomized particle diameters by roughing the surface of the edge part and its vicinity of a vibrator of the titled ultrasonic atomizer. CONSTITUTION:Sand or about 600-mesh metallic particles are sprayed on the edge part 26 and its adjacent region of the vibrator 10 of the ultrasonic atomizer such as a fuel nozzle 1 for a gas turbine, etc., by an air gun for several sec-several min to rough the surface of the edge part 26 and its adjacent region. Consequently, the wettability of the surface with the liq. is improved, the liq. is stably atomized, and the diameters of the atomized particles are extremely reduced and uniformized. Furthermore, the turndown ratio can be remarkably increased.

Description

[Detailed Description of the Invention] This -1- King 1 [))! The present invention generally relates to ultrasonic A and other devices, and in particular to (1) automatic heavy-duty fuel injection devices, such as electronically controlled gasoline injection valves or electronically controlled diesel injection valves, and (2) fuel nozzles for gas turbines. (3) Boilers, heating furnaces, and heater burners for industrial, commercial, and domestic use; (4) Liquid sprayers for industrial use, such as drying of liquid materials such as foods, medicines, agricultural chemicals, and fertilizers. Drying sprayer, temperature control and humidity control spray, sprayer A for baking powder (ceramic W grains), sprayer A
Suitable for use in coating equipment, reaction accelerators, and (5) non-body sprayers for industrial tools, such as pesticide sprayers, extinguishing liquid sprayers, etc., and sprays liquid intermittently or continuously. This relates to ultrasonic A and other devices that atomize particles.

Previously, liquids (in this specification-7, "liquid" is used to include not only liquids but also liquid substances such as suspension solutions) have been used in various fields as described above. Pressure jet A burners or liquid jets 'Ai'jA are used for atomization, ie atomization. °N used in such spray burners or liquid sprayers
The atomization device atomizes the liquid by a shearing action between the liquid injected from the nozzle and the outside air (atmosphere). Therefore,
In order to atomize the supplied liquid, it is necessary to increase the liquid supply pressure, and the liquid supply equipment such as pumps and piping becomes complicated and large.

Furthermore, the injection flow t- can be adjusted by changing the pressure of the supplied liquid or by changing the nozzle injection port area, but with the method mentioned in the song title, the state of atomization worsens at low IIt and low pressure. However, as a countermeasure to this problem, in medium to large boilers, air or steam is used in combination to atomize the liquid fuel supplied. As a result, the equipment became increasingly complex and 11 times larger. On the other hand, in the latter method, the structure of the nozzle is extremely complicated, and its adjustment and maintenance are difficult.

In order to improve these shortcomings of conventional atomizing devices, attempts have been made to pressurize and inject a liquid material from the injection port of the atomizing device and at the same time apply ultrasonic vibrations to the liquid material.

However, conventional ultrasonic liquid atomization devices do not
Since the value of jAj:l: was extremely small, it could not be used in the atomization device described in 1., which requires #i granulation of large containers.

In order to solve the conventional problem and achieve the atomization of the liquid as described above, the applicant provided an edge part at the end of the ultrasonic transducer and applied the liquid to the edge part in the form of a thin film. An ultrasonic injection method and an injection nozzle have been proposed in which the liquid is atomized into large particles from the edge portion by supplying the liquid with the liquid (see Japanese Patent Application No. 59-77572).

The present inventors conducted various research experiments in order to further achieve stable liquid parasiticization, finer and more uniform spray particle diameter in the above-mentioned injection nozzle, that is, the atomization device, and found that the tip edge of the vibrator That is, by making the surface of the liquid atomization part rough and improving the wettability of the surface to the liquid, 1.
We found that the foot points were resolved. The reason is that
(1) By improving the wettability of the surface of the edge portion to liquid, the liquid supplied to the surface of the vibrator edge portion is prevented from being repelled by the vibrating surface.
(2) Atomization at the edge requires time for vibration to be transmitted to the supplied liquid; This is thought to be because by improving the wettability of the surface to the liquid, the liquid supplied to the vibrator edge surface will not be repelled by the vibrating surface, and the time necessary for atomization will be obtained. .

The present invention was created based on this new knowledge,
4-This relates to improvement of the A-forming device.

Therefore, it is an object of the present invention to provide a sonic atomization device that can supply liquid continuously or intermittently.

Another object of the present invention is a super-RF wave atomization device that can efficiently atomize a liquid in large quantities with a fine particle size, and therefore can have a very large turndown ratio. The goal is to provide the following.

Another object of the present invention is to provide an ultrasonic atomization device that can achieve stable atomization without changing the state of atomization (particle size) depending on the properties of the supplied liquid, especially the viscosity. be.

The above-mentioned aspects of aging can be achieved by the ultrasonic atomization device according to the present invention.In summary, the unreleased I! Ultrasonic atomization comprising an elongated vibrator A connected at one end to a generating means and having an edge section at the other end, supplying liquid to the edge section and atomizing the supplied liquid at the edge section. According to a preferred embodiment of the present invention, the surface of the edge portion of the vibrator has a rough surface, and the average roughness of the surface of the edge portion of the vibrator is JIS BO404 (=t-
When measured based on the law's sweat fraud tolerance, it is 63 to 505.

Next, the atomizing device according to the present invention will be explained in more detail with reference to the drawings.

Referring to FIG. 1, an atomizer according to the present invention, ie, a fuel nozzle 1 for a gas turbine, for example, includes an elongated, generally cylindrical valve body 4 having a central hole 2 in the center. At the lower end of the valve box 4, there is a liquid supply means, ie, a fuel supply means 8, in which a through hole 6 coaxially aligned with the center hole 2 of the valve box 4 is formed.
is provided by a retainer (not shown) or integrally formed with the valve body 4.

A vibrator 10 is disposed passing through the center hole 2 of the valve box 4 and the through hole 6 of the fuel supply means 8. The vibrator 10 has a main body 14, which has a smaller diameter than the main body 14! 111 The main body part 14 having an elongated cylindrical vibrator shaft part 16 and a transition part 18 connecting the main body part 14 and the shaft part 16 is provided with a flange 20 having a larger diameter. A shoulder portion 22 formed at the -F end of the valve box 4 and a bolt (
It is attached to the valve body 4 by an annular vibrator retainer 24 held by a vibrator (not shown).

The shaft portion 16 of the vibrator 10 further protrudes below the valve box 4 and the liquid supply means 8, that is, toward the external force. Vibrator 10
An edge portion 26 is formed at the tip of the shaft portion 16, that is, the tip of the shaft portion 16.

According to FIGS. 1 and 3, the edge portion 26 of the vibrator 10 has a shape that includes a plurality of chevron-shaped projections in the same direction.5. 2 installations 1-. The diameter was gradually reduced to S. It can also be shaped into an annular step shape (FIG. 4), in which the diameter gradually increases, or in which the diameter gradually decreases and then increases. The most important thing is that an edge is formed at the tip of the vibrator.

The fuel supply means 8 is formed with one or more supply passages 28 arranged in an annular shape for supplying fuel to the I-joint part 26 of the vibrator IO. 1 pocket supply passage 28
The fuel supply 1] 30 is opened approximately adjacent to the upper end of the edge portion 26, and the other end 32 of the supply passage 28 is connected to the fuel supply source 1 (f), and liquid fuel is supplied thereto. Furthermore,
Liquid supply - A liquid supply passage 36 is provided in the first stage 8 in addition to the liquid supply passage 28 or in place of the liquid supply passage 28, and the liquid is directly supplied from the supply passage 36 to the edge portion 26 of the vibrator. It can also be configured to supply Further, the supply passage 36 is formed at a predetermined angle so that liquid can be supplied to any edge portion of the vibrator 26. Further, as can be understood from FIG. 1 and FIG. 2, the supply passages 36 are provided at four locations or at any number of two or more.

In configuration 1-, the vibrator 10 is continuously vibrated by the ultrasonic vibration generating means lOO operatively connected to the main body portion 14. Therefore, when the liquid fuel is supplied to the edge portion 26 via the supply passage 28, the liquid fuel is atomized and injected outward.

According to the present invention, further [- in the A-forming device, ancient t5
In order to achieve atomization of the liquid, as shown in FIGS. 3 and 4, the vibrator tip atomization section, that is, the edge section 2
6 and its vicinity (part of -1) is roughened.

To roughen the surface, mechanical treatment such as sandblasting or, for example, It! A chemical treatment using a chemical reaction such as immersion corrosion using acid, nitric acid, sodium hydroxide, picric acid, etc., or electric field corrosion can be used.

Next, -1, the flow tone of the roughened vibrator according to the invention is shown.

For a vibrator having an edge portion 26 having the shape shown in FIGS. 3 and 4, sand or metal particles (Medjuro 00#) are applied to the edge portion 26 and its adjacent area using an air gun for several seconds to several minutes. The edge portion 26 and its adjacent area were roughened by spraying.

The edge 126 of the vibration f and the adjacent area are determined according to JISBO40.
When observed using an optical microscope (reflection type) based on 4, the surface roughness of the edge portion 26 and the adjacent area was 63 to 50S.
It was within the range of

Frequency: 38kHz, 4&j using the vibrator described above.
Foyoyo was carried out at a width of 35 pm, liquid supply: i 7 , and 4 g/S. The distribution of the spray particle size at that time is shown in FIG. Figure 6 shows the distribution of jet A particle size when a conventional vibrator without surface treatment as shown in Figure 5 and Figure 6 is used under the same conditions. Release 1! In the case of jet A according to I, the arithmetic average grain diameter is 45 m, and the Sautaya average grain diameter is 62 m, whereas according to the conventional oscillator, the arithmetic mean grain t\ is 51#Lm, The average particle size of Zalator is found to be 67 gm.

That is, according to the present invention, compared to the conventional vibrator.

It will be appreciated that the blast particle size is finer and more uniform.

In the actual flow control described in , it was explained that the liquid was supplied to the edge part of the tip of the vibrator from the outer periphery, but the edge part was provided in a recess formed at the tip of the vibrator, and the edge part Supply is made from a supply channel formed inside the child,
The present invention is also suitably applied to an atomizing device using a so-called hollow vibrator.

The atomizing device according to the present invention configured as shown in FIG. This improved method is extremely effective in achieving stable atomization of the liquid, miniaturization and uniformity of the spray particle size, and has the advantage that a very large turndown ratio can be achieved.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of an embodiment of a super-serial wave intensification device related to unreleased Ij1. FIG. 2 is a side view of the device of FIG. 1, viewed from the edge side. Figures i3 and 4 are half sectional views of the vibrator edge portion of the a-sawa wave converting device according to the present invention. FIG. 5 is a graph showing the spray particle size distribution when using the vibrator constructed according to the present invention. FIG. 6 is a graph showing the spray particle size distribution when a conventional vibrator is used. 1: Atomization device 4: Valve box 8: Liquid supply means 10: Oscillator 26: Edge portion 28.36: Liquid supply passage agent Patent attorney ILI Kubo IMo Fig. 1 40 Fig. 3 Fig. 4

Claims (1)

[Scope of Claims] 1) An elongated vibrator comprising an ultrasonic vibration generating means and an elongated vibrator connected at one end to the ultrasonic vibration generating means and having an edge portion at the other end, the edge portion being filled with liquid. In an ultrasonic atomizer that supplies liquid and atomizes the supplied liquid at the edge part,
An ultrasonic atomization device characterized in that the edge portion of the vibrator and the surface in the vicinity thereof are roughened. 2) The ultrasonic atomization device according to claim 1, wherein the average roughness of the surface of the vibrator edge portion is 6S to 50S.