JPS6133257A - Atomizer - Google Patents

Abstract

PURPOSE:To simplify remarkably the fitting structure by specifying the fitting direction of a supply pipe and a discharge pipe to a body. CONSTITUTION:An atomizer 1 is formed so that a supply pipe 8 and a discharge pipe 9 may be positioned at the right side surface of a body 3, and opposed to the atomizing direction of liquid droplets 17. Namely, since both pipes are provided opposite to the left side surface of the body 3 wherein a nozzle 2 is provided, the atomizer 1 is fitted to an air guide cylinder 21 only through a fitting surface 19, and the structure of the whole structure and the assembly are extremely simplified. Accordingly, a sealing member for preventing the leakage of air is almost dispensed with, and the troublesome seal structure can be omitted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a spraying device for various liquids such as liquid fuel, water, and chemical rB liquid. This invention relates to a piezoelectric spraying device that vibrates a liquid and sprays it from a nozzle facing a pressurized chamber.

Structure of conventional example and its problems Conventionally, this type of spraying device has mainly been an inkjet sprayer. Various types of ink atomization devices for printers and the like have been proposed and put into practical use. Furthermore, in recent years, a spraying device as shown in FIG. 1 has been proposed as a spraying device that can be applied not only to inkjet printers but also to various uses.

In FIG. 1, the spray device 1 includes a body 3 having a cylindrical pressurized chamber 2 with a diameter of 5 to 20 mm and a depth of 1 to 5 mm.
A nozzle plate 5 having a plurality of nozzles 4 with a thickness of 30 to 11001z and a diameter of 30 to 100 μm, and an outer diameter of 5 to 20 μm.
mm, thickness 0.5 to 2 mm, and is composed of an annular piezoelectric ceramic 7 having an opening 6, which are bonded to each other as shown in the figure. The pressurized chamber 2 is connected to a tank 1o and a fan 11 by a supply pipe 8 and an exhaust pipe 9, respectively.
It is connected to the. The liquid level 12 in the supply pipe 8 is at the same level as the liquid level 13 in the tank 10 before the start of operation.

When the operation starts, the fan 11 is driven and the exhaust pipe 9
Negative pressure generated by the fan 11 is applied to the liquid level 12 via the pressurizing chamber 2. Therefore, the liquid level 12 rises to the level of the liquid level 14 in the exhaust pipe 9 as shown in the figure.

During the rising process of the liquid level, air flows in from the nozzle 4, but since the diameter of the nozzle 4 is small, the negative pressure generated by the fan 11 is almost the same! is applied to the liquid level 12.

Therefore, the liquid level 12 rises stably to position 14 in the figure.

Although not shown, 'FIyW' is provided on the pressurized ceramic 7 on the adhesive surface with the nozzle plate 5 and on the surface opposite thereto. Lead wires 15 and 16 are soldered as shown in the figure in order to supply an alternating current voltage as shown in FIG. 2 between these electrodes. When this AC voltage is supplied, the piezoelectric ceramic 7
generates expansion and contraction strain in its diametrical direction, and the bimorph vibrating body consisting of the piezoelectric ceramic 7 and nozzle plate 5 causes deflection vibration as indicated by the broken line in FIG. 1 in accordance with the polarity of the AC T4 pressure. Due to this flexural vibration, a strong sound pressure is generated in the liquid in the pressurizing chamber 2 around the nozzle /I/4, and as a result, droplets 17 are ejected from the nozzle 4 as shown in the figure. Also, the volume of liquid corresponding to the ejected droplet is nozzle/L/4
Since the liquid is naturally sucked up and supplied from the supply pipe 8 due to the surface tension of the liquid generated in the liquid, there is no need for a liquid supply means such as a pump, and the overall structure of the apparatus is extremely simple and compact.

The conventional spraying device shown in Figure 1 has an extremely simple structure, has excellent controllability, has uniform droplet diameters, and has surprisingly low power consumption. However, it had the following drawbacks.

FIG. 3 is a structural diagram of a spraying device for explaining the drawbacks of this conventional spraying device. In FIG. 3, the same reference numerals as in FIG. 1 are equivalent structures, and their explanation will be omitted.

In the figure, the spray device 1 is attached to a mounting plate 19 through screws 18. The mounting plate 19 is provided so that the air holes 2° are located around the spray device 1 as shown in the figure. 21
1 is an air guide cylinder which functions as a guide for mixing the air sent from the supply cylinder 22 with the spray droplets 17 as shown by the arrow in the direction of the arrow in the air by a fan or the like, and conveying the mixture to the spray chamber 23. That is, when this spray device 1 is applied to a combustion device or the like to spray liquid fuel, or when it is applied to a chemical spray device to spray a chemical solution, air is drawn not only from the spray chamber 23 but also from the air guide tube 21. Alternatively, it is essential to prevent the mixture from drifting to the side, and for this purpose, the supply pipe 12, exhaust pipe 14, and lead wires 15, 16
It was necessary to seal tightly with seal members 24, 25 and 26, respectively, as shown in the figure. For this reason, it is extremely troublesome to attach the spray device 1 to the air guide tube 21, which complicates the configuration of the entire device, increases the price, and may limit the scope of application of the spray device. It had the disadvantage of lacking in.

Purpose of invention.

The present invention has been made to eliminate the above-mentioned drawbacks.

The purpose of this is to greatly simplify the construction of the installation groove for the spray device by improving the configuration of the supply pipe and exhaust pipe, thereby significantly simplifying the overall configuration of the device and making it possible to produce it at low cost. It is an object of the present invention to provide a spraying device that has an extremely wide range of application to wax.

Structure of the Invention In order to achieve the above object, the present invention has the structure described below.

That is, a body having a pressurizing chamber, a nozzle plate having a nozzle, and an electric vibrator that bends and vibrates the nozzle plate.
It comprises a supply pipe and an exhaust pipe connected to the pressurizing chamber, and is configured such that the direction in which the supply pipe and the exhaust pipe are attached to the body is opposite to the direction in which the liquid is sprayed from the nozzle. With this configuration, the mounting structure of the spray device in various applications can be significantly simplified and the range of applications can be greatly expanded.

DESCRIPTION OF THE EMBODIMENT FIGS. 4a, b, and C are a cross-sectional view and a left-right plan view of a spray device showing an embodiment of the present invention, and the same reference numerals as in FIG. 3 indicate corresponding components. , the explanation is omitted.

In FIG. 4a, the spray device 1 is constructed such that a supply pipe 8 and an exhaust pipe 9 are located on the right side of the body 3, and are opposed to the direction in which droplets 17 are sprayed. That is, both pipes are provided opposite the left side surface of the body 3 where the nozzle V4 is provided. For this reason,
The attachment surface 19 is the only surface involved in attaching the spray device 1 to the air guide cylinder 21. Since the only wall surface of the air guide cylinder 21 that requires consideration for mounting the spray device 1 is the mounting surface 19, the structure and assembly of the entire device is extremely simple. Further, by adopting the configuration as shown in the figure, the seal part for preventing air leakage is almost unnecessary, and the troublesome seal h'4 structure can be omitted. Therefore, it is possible to simplify the structure of the entire device and its assembly process into one m1 unit, and to reduce the cost.

In addition, as shown in the figure, the lead wire 15 is also guided to the right side of the body 3 through the through hole 24 provided in the body 3, so that the entire boundary between the spray device 1 installed in the air guide tube 21 and the outside world is connected. Since it is possible to concentrate only on surface 19, the mounting structure can be further simplified.

FIG. 5 is a cross-sectional view of a spray device showing another embodiment of the present invention, and the same reference numerals as in FIG. 4 indicate corresponding components;
The explanation will be omitted.

In FIG. 5, the spray device 1 is composed of a body 3a and 3b divided into two as shown in the figure, and the right half of the body 3b is provided with a supply pipe 8 and an exhaust pipe 9.
A nozzle plate 5 and the like are provided on the left half of the body 3a. With this configuration, both pipes can be attached to the body 3b very easily. This is because piezoelectric ceramics are easily damaged by machining.
This is because both pipes can be attached with the nozzle plate 5 and the nozzle plate 5 separated. Note that 26 is a protective cover for protecting the piezoelectric ceramic 7 and the nozzle plate 5 from mechanical or thermal damage.

Effects of the Invention As described above, according to the present invention, a nozzle plate is provided so that the nozzle faces the pressurizing chamber, and the nozzle plate is flexibly vibrated by an electric vibrator, and supply and exhaust side pipes are connected to the pressurizing chamber. In addition, since the two pipes are attached to the body so as to face the direction in which the liquid is sprayed from the nozzle, the attachment structure is extremely simple, simplifying the overall configuration of the device and reducing the assembly process. It is possible to realize simplification and cost reduction, and moreover, it can provide a spray attachment with a width rr-<2 during application for various uses, and its industrial value is extremely large.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional spraying device, FIG. 2 is a drive voltage waveform diagram of the same device, FIG. 3 is a cross-sectional view of the same device, and FIG. FIG. 2... Pressure chamber, 3... Body, 4...
...Nozzle, 5...Nozzle plate, 7...
...Electric vibrator, 8... Supply pipe, 9.
...Exhaust Noku Eve.

Claims (3)

[Claims] (1) A body having a pressurizing chamber filled with liquid, a nozzle plate having a nozzle facing the pressurizing chamber, and vibrating the nozzle plate to vibrate the liquid in the pressurizing chamber. and an electric vibrator that sprays from the nozzle, and a supply pipe and an exhaust pipe connected to the pressurizing chamber, and a liquid that is sprayed from the nozzle in a direction in which the supply pipe and the exhaust pipe are attached to the body. spray device configured to face the direction in which the (2) The body is configured such that the surface on which the supply pipe and exhaust pipe are attached and the surface on which the nozzle plate is attached face each other, and the direction in which the supply pipe and exhaust pipe are attached and the direction in which the liquid is sprayed face each other. A spraying device according to claim 1, configured as described above. (3) The spray device according to claim 1, wherein the body is composed of two elements, the first element is provided with a nozzle plate, and the second element is provided with a supply pipe and an exhaust pipe.