JPH04131157A - Ultrasonic atomizer - Google Patents

Abstract

PURPOSE:To ensure easy assembly and liquid ejection to an atomization part at correct angle by using a shape memory material which makes curved at a specified angle toward an atomization part, a straight tube nozzle at deformation temperature and restores the curved nozzle to a normal shape according to memory about the cultivature stored at the low degree stage of operating temperature. CONSTITUTION:The subject device consist of a monolithically molded body having a tubular atomization part 3 with the tapered end. Its constituents are a hone 1 driven by ultrasonic waves, a cylindrical holder 4 which elastically supports the hone 1 at the joint part and has a cut-out annular groove 10 communicating with a liquid source on the periphery, and nozzles 14, each having one end open to the annular groove 10 with the sealed periphery and the other end directed to the atomization part 3. A liquid ejected toward the atomization part 3 from the nozzle 14 is atomized. Further a shape memory material is provided which makes curved at a specified angle toward an atomization part 3, a straight tube nozzle at deformation temperature and restores the curved nozzle to a normal shape according to memory about the culvature stored at the low degree stage of operating temperature. Subsequently, it is possible to ensure easy assembly of the nozzle 14 and thereby obtain a highly efficient ultrasonic atomizer capable of ejected liquid to the atomization part at a correct angle.

Description

[Detailed description of the invention] The present invention relates to an ultrasonic atomizer (ultrasonic atomizer), and more specifically, to a material of a nozzle that sprays liquid toward the rear of an enlarged diameter tube driven by ultrasonic waves. Regarding.

Keito TakemaeRecently, global environmental problems associated with fossil fuels have been brought up, such as increasing the efficiency of energy use, purifying the global environment, and in particular regulating carbon dioxide emissions to combat global warming and countermeasures against acid rain. Petroleum as a fossil fuel is consumed as an industrial fuel, a liquid fuel such as gasoline, light oil, and heavy oil, and is the main target of the global environmental problems mentioned above, and demands for standards for the effective use of these fossil fuels are increasing year by year. ing. Ultrasonic atomizers meet this demand.Since the combustion efficiency of liquid fuels such as petroleum depends on the size of the particles of these liquid fuels, ultrasonic atomizers use ultrasonic vibrations to shear and atomize liquid fuels before spraying them. It improves the combustion efficiency of boilers, cast turbines, etc., and similar effects can be obtained by applying it to injection valves of electronically controlled internal combustion engines such as gasoline and diesel engines. Furthermore, it can be used not only for atomization of liquid fuel, but also for general industrial use, and humidity control for food use, such as phiceramics, humidification of food powder, tobacco manufacturing process, and fresh food processing process. Ultrasonic atomizers are attracting attention as a means of humidification in many fields.

Figure 2 is a structural diagram of a conventional ultrasonic atomizer.
21 is a horn, 22.22 is a piezoelectric element, 23.23 is a terminal, 24.24 is an insulator, 25 is a connector, 26 is an atomizer, 27 is a first holter, 28 is a support flange, and 29 is an elastic ring, 30 is a stop ring, 31 is a fluid passage, 3
2 is a liquid supply pipe, 33 is a second holter, 34 is a packing, 35
36 is a nozzle, 36 is an annular groove, 37 is a screw, 38 is a connection bolt, and 39 is a jig hole. A conventional ultrasonic atomizer consisting of the above-mentioned components includes a Langevin-type piezoelectric vibrator formed by pressing a piezoelectric element 22.22 having a terminal 23.23 with a pressure contact 24.24, a connector 25, and an enlarged diameter tubular mist. The horn 21 is integrally formed with the horn 26, and the elastic ring 29 is inserted into the cylindrical body consisting of the first holder 27 and the second holder 33 at the support flange 28 provided at the joint of the horn 2. It is elastically supported and fixed by a stop ring 30. The first holter 27 is provided with a fluid passage 31 that communicates with the liquid supply pipe 32 . The first holder 27 and the second holder 33 are made separately, and the screw 37 is inserted through the packing 34.
It is screwed on. Inside the second holder 33, a plurality of nozzles 35 for spraying the atomized liquid toward the rear surface of the atomizing section 26 are annularly bored at equal intervals.
Holes are bored at a plurality of positions on the circle corresponding to 6 so that the ejected liquid can be supplied to the fluid passage 31 or the nozzle 35. For this reason, each nozzle 35 has an annular groove bored in the first holder 27 and the second holder 33 facing the joint surface of the packing 34 which is pressed between the first holder 27 and the second holder 33. 36 to the fluid passage 3]. Note that the jig hole 39 is a hole for inserting a jig (not shown) for screwing the second holder 33 into the first holder 27.

In the obliquely mounted ultrasonic atomizer, by applying ultrasonic drive power to the terminals 23, 23 of the Langevin piezoelectric vibrator, the horn 21 vibrates ultrasonically with the support flange 28 as a node and the atomization part 26 as an abdomen.

The injection liquid injected from the nozzle 35 is atomized into an enlarged diameter tube.
A liquid film is formed on the rear surface of the atomizer 26, and this liquid film is atomized and diffused from the outer periphery of the shear atomization atomization section 26 by ultrasonic vibration.

``1 Point of Conventional Surgery'' The above-mentioned conventional ultrasonic atomizer has a supporting flange 28 at the node of the horn 21, and an atomizing section 26 in the shape of an enlarged diameter tube at its abdomen, so that a support holder cannot be integrated into the atomizer. It was not possible to insert the horn 2 as it was, so the horn 2 was divided into two parts at another joint and each part was joined with a connecting bolt 38. However, dividing the horn 21 into two parts and joining them together increases the variation in vibration characteristics and increases the possibility of mechanical damage.

Furthermore, in order to communicate the nozzle 35 with the flow path 38, it is necessary to separate the first holder 27 and the second holder 33 and process them separately. It is difficult to drill a hole, and the difficulty increases as the nozzle diameter of the nozzle 35 becomes smaller.Furthermore, instead of the nozzle 35 having a slanted hole as described above, a tubular hole in the first holder 27 is used. When installing a nozzle, a straight pipe nozzle is embedded in the annular side surface of the first holder 27, the horn 21 is inserted through the support assembly, and then the straight pipe nozzle is bent at a predetermined angle. It has been difficult to correctly bend the nozzle of the rear straight pipe at a predetermined angle.

The present invention was developed in view of the actual situation of slanting, and improves the excitation efficiency of the horn by integrally forming the resonator from the same material. The ultrasonic atomizer is an efficient ultrasonic atomizer that memorizes a shape that curves at a predetermined angle toward the target, and that is easy to assemble by implanting a straight tube-shaped shape memory material in the holder at the assembly temperature and sprays liquid at a precise angle. It was made for the purpose of (1)
) An integrally molded horn that has an atomizing part in the shape of an enlarged diameter tube at the end and is driven by ultrasonic waves, and a cylindrical horn that elastically supports the horn at the joint part and has an annular groove in the outer periphery that communicates with the liquid source. a holder, and a plurality of nozzles having one end opened in the annular groove that seals the outer periphery of the annular groove and the other end facing the atomizing section, and atomizes the liquid sprayed from the nozzles toward the atomizing section. In the atomizer, the nozzle has a straight tube shape, and the straight tube is made of a shape memory material that is curved at a predetermined angle toward the atomization part at a transformation temperature and memorizes the curved shape when the operating temperature is low; (2) The nozzle is characterized in that only the curved portion of the nozzle is made of a shape memory material.

1 - Consistency Figure 1 is a structural diagram of the ultrasonic atomizer of the present invention, in which 1 is a horn, 2 is a Langevin type piezoelectric vibrator, 3 is an atomizing section, 4 is a holder, 5 is a support flange, 6 is an elastic ring, 7 is a stop ring, 8 is a liquid supply pipe, 9 is a fluid passage, 1
0 is an annular groove, 1] is a band-shaped ring, 14 is a nozzle (channel pipe), and 15 is a cover. The ultrasonic atomizer consisting of the above-mentioned components has a horn 1 integrally molded from the same material, and an ultrasonically driven piezoelectric vibrator 2 (only a portion is shown) in the form of an ultrasonic wave. It is elastically supported on the outer periphery of a support flange 5 provided on the holder 4 and an elastic ring 6, and is fixed with a stop ring 7.

An annular groove 10 is provided on the outer peripheral surface of the holder 4, and a fluid passage 9 communicating with a liquid supply pipe 8 is opened in the annular groove 10. Furthermore, through holes 13 are provided in the annular groove 10 at equal intervals and are open to the atomizing section 3 side. A straight nozzle (flow path pipe) 14 is inserted into the through hole 13, and the outer periphery of the annular groove 10 is covered with a band-shaped ring 11 and sealed by spot welding] 2 or the like.

The nozzle (channel pipe) 14 is made of a straight pipe made of a shape memory alloy, for example, a copper base metal. As is well known, the shape memory effect is
A phenomenon in which an alloy that undergoes thermoelastic martensitic transformation is plastically deformed by applying a deforming force to the alloy where the difference between the martensitic transformation temperature and the inverse transformation temperature is small, and then when it is heated, the shape of the alloy returns to its original shape before plastic deformation. When it is plastically deformed at the transformation temperature and cooled, this deformation is memorized. Further, each alloy has a different characteristic curve between temperature and deflection, and deformation of the alloy occurs according to this temperature deflection characteristic.

In particular, copper-based alloys (copper-zinc-aluminum alloys) have a low transformation temperature and are therefore easy to process.

The memory alloy nozzle (flow path pipe) 14 is inserted into the through hole 13 in a straight pipe state by spot welding or the like, bent to a predetermined degree at the operating temperature, and then heated to a high temperature (for example, 80°C). ℃), and after cooling, it bends into a predetermined shape according to shape memory.

Although the shape memory alloy was a copper-based shape memory alloy in Slant Up, the transformation temperature was high, but titanium-nickel (Ti-Nj) was used.
It may also be a type of shape memory alloy. Further, not only shape memory alloys but also resin shape memory materials such as polynorginene resins are included. In short, the nozzle 14 is arranged on the horn 1, which is integrally formed with the atomizing part 3 having an enlarged diameter tubular shape and large diameter parts such as the support flange 5, and after the nozzle 14 is arranged behind the atomizing part 3, the efficiency is increased. Any nozzle 14 may be used as long as it is made of a shape memory material that memorizes a curved shape that curves at a good angle.

Generally, shape memory alloys are expensive and the entire nozzle 14
It would be expensive to use a shape memory alloy for the nozzle, so if only the part to be bent and deformed is made of a shape memory alloy, and the other flow pipe parts are ordinary metal tubes, an inexpensive nozzle] 4 can be obtained. Nozzle 1
After bending and deforming the holder 4, a cover 15 is welded to the outer periphery of the holder 4 by spot welding or the like. An annular groove]O was bored on the outer periphery of the holder 4 on the diagonal top, but instead of the annular groove 10, the nozzle 14 was installed as a ring-shaped conduit (not shown), and the ring-shaped conduit was connected to the holder. 4 may be fixed concentrically.

Power---! As is clear from the above description, according to the present invention, (1) the horn 1 can be integrally fabricated from the same material, making it possible to create a highly efficient vibrator with small variations in vibration characteristics.

(1) Only one holder 4 is required to hold the horn 1 and nozzle 14, resulting in an inexpensive and simple structure that reduces man-hours.

- Since there are no joints in the horn 1, the possibility of mechanical damage can be reduced.

Effects such as this can be obtained.

[Brief explanation of drawings]

FIG. 1 is an assembly diagram of an ultrasonic atomizer according to the present invention, and FIG. 2 is an assembly diagram of a conventional ultrasonic atomizer. 1. Horn, 2. Piezoelectric vibrator, 3. Atomization section, 4
... Holder, 5 ... Support flange, 6 ... Elastic ring, 9 ... Channel tube, 10 ... Annular groove, 14 ... Nozzle, 15 ... Cover Patent applicant Oval Equipment Industry Co., Ltd. (1 other person) Σ Figure

Claims (1)

[Claims] 1. A horn driven by ultrasonic waves as an integral molded body having an atomizing section with an enlarged diameter tube at its end, and an annular horn that elastically supports the horn at a node and communicates with a liquid source on its outer periphery. A cylindrical holder with a groove formed therein, and a plurality of nozzles having one end opened in the annular groove whose outer periphery is sealed and the other end directed toward the atomizing section. In an atomizer that atomizes a liquid injected toward a target, the nozzle is formed into a straight tube, and the straight tube is curved at a predetermined angle toward the atomization section at a transformation temperature, and a shape memory material memorizes the curved shape at a low operating temperature. An ultrasonic atomizer characterized by comprising: 2. The ultrasonic atomizer according to claim 1, wherein only a curved portion of the nozzle is made of a shape memory material.