JPH10305248A - Liquid jetting device using ultrasonic wave - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid jetting device in which air bubbles are hard to generate and capable of eliminating the air bubbles without stopping oscillation of a vibrator, even if the air bubbles generate. SOLUTION: In this device provided with a nozzle 1, a vibrator 2 mounted on a clogging part oppositely facing to an injection port 11 of the nozzle 1, and a connection port 10 provided on the side face of the nozzle 1 in order to connect a feed piping 3 for feeding liquid into the nozzle 1 and in which an ultrasonic wave is propagated from the vibrator 2 into the liquid fed from the feed pipe 3 to inject the liquid, a discharge port 12 for discharging an excess quantity of the liquid is provided on the side face oppositely facing to the connection port 10 of the feed pipe 3 of the nozzle 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid ejecting apparatus,
More specifically, the present invention belongs to a device that propagates an ultrasonic wave into a liquid and ejects the liquid with its energy.

[0002]

2. Description of the Related Art Techniques for accelerating a liquid by applying ultrasonic energy to the liquid are used in humidifiers, washing machines, and the like. This is done by contacting the liquid with an ultrasonic transducer and propagating ultrasonic waves through the liquid.

[0003] For example, a liquid jet type washing machine is used for washing electronic parts and precision instruments. As shown in FIG. 2, a nozzle 1 fixed downward in the direction of gravity and an injection port 11 of the nozzle 1 are provided. Vibrator 2 attached to the closed part facing
And a supply pipe 3 connected to a side surface of the nozzle 1 for supplying a liquid. Then, the cleaning liquid supplied into the nozzle 1 from the supply pipe 3 is accelerated to a level higher than the gravity together with the excitation of the vibrator 2 and jetted toward the object. Therefore, in the case of the washing machine, the liquid contact surface 2a of the vibrator 2 must always be in contact with the liquid at the time of excitation in order to effectively apply ultrasonic waves to the liquid and sufficiently exert the cleaning ability. If wetted surface 2
If the vibrator is excited in the state where a does not come into contact with the liquid, not only the cleaning ability becomes insufficient, but also the vibrator becomes empty and shortens its life. If you continue to cook in the empty state, the vibrator will be damaged.

However, in reality, air remaining in the nozzle 1 and the supply pipe 3 and bubbles generated in the liquid do not completely escape from the injection port 11 even if the liquid is sufficiently supplied. Collects on the wetted surface. Usually, the nozzle 1 is used with the injection port 11 facing downward, and the nozzle 11 and the supply pipe connection port 10 are used.
Since the vibrator 2 is higher than the vibrator 2, the nozzle 1
When air bubbles accumulate inside, the air bubbles cannot escape and keep in contact with the liquid contact surface.

Therefore, in the conventional liquid jet type washer, in order to prevent the vibrator 2 from being cooked idly, it is necessary to stop excitation of the vibrator 2 and move the injection port 11 upward to remove air bubbles. did not become. In this case, removing bubbles after a large amount of bubbles accumulates is too slow to prevent empty cooking,
It is necessary to pull it out in small steps.

[0006]

However, it is difficult to detect a small amount of air bubbles. However, if the excitation of the vibrator is periodically stopped and removed periodically, the injection efficiency is poor. In addition, depending on the cleaning method, it may be required to mix a chemical such as hydrofluoric acid or ammonia. However, since bubbles are easily generated when mixing the chemicals, a conventional liquid jet cleaning machine is used for the chemical. I couldn't do that. Therefore, an object of the present invention is to provide a liquid ejecting apparatus in which air bubbles are hardly generated, and even if they are generated, air bubbles can be removed without stopping excitation of the vibrator.

[0007]

In order to achieve the object, a liquid ejecting apparatus according to the present invention comprises a nozzle, a vibrator mounted on a closed portion facing an ejection port of the nozzle, and a liquid in the nozzle. A connection port provided on a side surface of the nozzle for connecting a supply pipe for supply, and a device for ejecting a liquid by transmitting ultrasonic waves from a vibrator into a liquid supplied from the supply pipe and ejecting the liquid. A discharge port for discharging an excessive amount of liquid is provided on a side surface facing the pipe connection port.

With this feature, of the liquid supplied from the supply pipe, most of the liquid required for injection is injected from the injection port, and the remainder is discharged from the discharge port. Then, the bubbles in the nozzle are pushed out by the liquid flowing out from the outlet.

It is preferable that the vibrator is mounted so that a virtual plane including a liquid contact surface thereof intersects a discharge port.
Then, when the apparatus is used with the injection port facing downward, the position of the discharge port is the same as or higher than the liquid contact surface, so that the buoyancy of the bubbles works in the direction of the discharge port, and the bubbles are easily generated.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid ejecting apparatus according to a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing the liquid ejecting apparatus.

The liquid ejecting apparatus includes a nozzle 1 and a vibrator 2 mounted on a closing portion of the nozzle 1 facing the ejection port 11.
And a supply pipe 3 connected to a side surface of the nozzle 1 and supplying a liquid into the nozzle. In this apparatus, as shown in the drawing, the ejection port 11 faces downward, the object 9 to be cleaned is fixed below the ejection port 11, and ultrasonic waves are propagated from the vibrator 2 into the liquid supplied from the supply pipe 3 so that the ultrasonic wave is transmitted from the ejection port 11. The liquid is ejected toward the object.

A discharge port 12 for discharging an excessive amount of liquid is provided on a side of the nozzle 1 opposite to the supply pipe connection port 10. The discharge pipe 4 is connected to the discharge port 12. The vibrator 2 is fixed at a proper distance from the rear end face 7 of the nozzle 1 by a collar 6. The packing 5 interposed between the vibrator 2 and the collar 6 prevents liquid from leaking to the rear of the vibrator 2. This is because if the liquid leaks behind the vibrator 2, the lead 8 short-circuits in the space surrounded by the collar 6. Further, the positional relationship between the vibrator 2 and the outlet 12 is set such that a virtual plane including the liquid contact surface 2 a intersects the outlet 12. Therefore, when the injection port 11 is downward as shown in the drawing, the upper end edge of the discharge port 12 is slightly higher than the liquid contact surface 2a of the vibrator.

In this apparatus, a part of the supplied liquid is constantly discharged from the discharge port 12 while the liquid is being injected from the discharge port 11. Therefore, the bubbles in the nozzle 1 are pushed out by the liquid flowing out from the discharge port 12 immediately after generation. In addition, the position of the upper edge of the discharge port 12 is
Since it is higher, the air bubbles easily escape from the outlet 12 in cooperation with their buoyancy. Therefore, bubbles do not stay in the nozzle 1.

[0014]

According to the liquid ejecting apparatus of the present invention, bubbles are hardly generated, and even if they are generated, the bubbles can be quickly removed without stopping the excitation of the vibrator. it can. In addition, when used as a washing machine, it is advantageous in that it has excellent washing efficiency and that a chemical solution can be used.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a liquid ejecting apparatus according to an embodiment.

FIG. 2 is a cross-sectional view illustrating a conventional liquid ejecting apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle 2 Oscillator 3 Supply pipe 4 Discharge pipe 2a Liquid contact surface 9 Object to be cleaned

Claims (2)

[Claims] A nozzle, a vibrator mounted on a closed portion facing an injection port of the nozzle, and a connection port provided on a side surface of the nozzle for connecting a supply pipe for supplying a liquid into the nozzle. In a device for ejecting liquid by transmitting ultrasonic waves from a vibrator into a liquid supplied from a supply pipe, a discharge port for discharging an excessive amount of liquid is provided on a side of the nozzle opposite to a supply pipe connection port. A liquid ejecting apparatus characterized in that: 2. The liquid ejecting apparatus according to claim 1, wherein the vibrator is mounted such that a virtual plane including a liquid contact surface thereof intersects a discharge port.