JP3297225B2 - Water jet nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet nozzle which is used for cleaning and coating stripping operations using a jet stream.

[0002]

2. Description of the Related Art Conventionally, in this kind of washing and paint peeling work, a jet jet is jetted from a nozzle at a high pressure, and washing and paint peeling are performed by the dynamic pressure and the flow velocity.

FIG. 4 shows an example of a conventional jet nozzle. In the figure, reference numeral 1 'denotes a cylindrical nozzle body, and the tip of the nozzle body 1' is conically narrowed to form a nozzle opening 1; 'A. Ultra-high pressure water 21 is supplied to the nozzle body 1 ′ from the ultra-high pressure fluid generation source 20, and is sprayed from the nozzle opening 1 ′ a as a high-speed water jet 18 onto a work (not shown) for performing cleaning, coating peeling, and the like. It is configured as follows.

[0004]

However, in the above-described conventional jet nozzle, the cleaning effect is low only by the dynamic pressure and flow rate of the water jetted from the nozzle opening, and the cleaning and stripping operations are performed efficiently. Therefore, there is a problem that the pressure for creating the jet jet must be further increased.

An object of the present invention is to solve the above-mentioned problems by generating cavitation in a jet stream and improving the cleaning / separation effect by erosion of cavitation.

[0006]

In order to achieve the above object, a water jet nozzle according to the present invention is characterized in that a cavitator is provided at a central portion inside the nozzle.

A swirl vane is provided between the outer periphery of the cavitator and the inner wall of the nozzle for imparting swirl to the jet jet, and the rear end of the cavitator is positioned downstream of the nozzle by the swirl vane.

Further, it is effective to connect a vibrator for applying vibration to the cavitator to the front end of the cavitator provided at the center of the water jet nozzle.

[0009]

In the present invention constructed as described above, if a cavitator is provided in the nozzle, when the jet jet exits the nozzle, a cavity created by the cavitator is included therein, so that the cavity can be included in the jet. it can.

The cavity created by the cavitator, when in direct contact with the inner surface of the nozzle, erodes the inner surface of the nozzle, so that the cavity must be centered on the jet stream.

[0011] Therefore, a swirl vane is provided in the nozzle to impart swirl to the jet jet. The revolving jet has the property that the pressure decreases toward the center. Due to this pressure gradient,
Cavity bubbles having a low specific gravity are collected at the center of the jet and can be prevented from directly contacting the inner surface of the nozzle. As a result, the inner surface of the nozzle portion is protected.

On the other hand, erosion caused by cavitation generated during jet jetting on the surface of a work to be subjected to operations such as cleaning and coating peeling occurs during the collapse process of the cavity. As a result, the washing and the coating stripping work can be performed efficiently.

[0013] Further, the cavitation is vibrated by the vibrator to change the cavity, so that the erosion of the cavity can be further increased.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a nozzle according to a first embodiment of the present invention, FIG. 2 is a side view of a nozzle according to the second embodiment, and FIG. 3 is a side view of a nozzle according to the third embodiment.

First, in FIG. 1, reference numeral 1 denotes a nozzle, 2 denotes a cavity provided near the center of the inside of the nozzle 1, and 3 denotes a cavity formed by the operation of the cavitator 2. A high-pressure jet stream 5 is formed in the nozzle 1 by an arrow. Supplied in the direction,
The jet containing the cavity bubbles 4 in the jet flow is jetted from the nozzle opening and collides with the surface 7 of the object to be cleaned and stripped.

The erosion effect when the cavity bubbles 4 are collapsed enhances the effect of cleaning and painting. Reference numeral 6 indicates the flow direction of the water flow with an arrow.

Referring to FIG. 2, in the case of this embodiment, in addition to the case of the embodiment of FIG. 1, a swirl vane 8 is further provided between the inner wall of the nozzle 1 and the outer peripheral surface of the cavitator 2.
And the rear end (the lower end in the figure) of the cavitator 2 is positioned downstream of the swirl vanes 8 so as to face the outlet throttle portion of the nozzle 1.

Since the swirling blade 8 imparts a swirling component to the jet 5 flowing in the nozzle 1, the cavity 3 gathers at the center of the jet and does not contact the inner surface of the nozzle 1, thereby preventing damage to the nozzle.

Still referring to FIG. 3, in the case of this embodiment, the vibrator 9 is connected to the upper end of the cavitator 2 in order to vibrate the cavitator 2 in the vertical direction of the figure as shown by the arrow 10.

Since the cavity becomes larger or smaller in response to this vibration, large bubbles 11 are present in the jet.

When this hits the surface 7 of the object, it collapses at once as a large bubble and gives a large impact force, so that the cleaning and peeling effect of the coating is improved. The larger the bubble, the higher the energy.

Although several embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes are possible within the scope of the technical idea of the present invention. Also belong to the technical scope of the present invention.

[0023]

According to the water jet nozzle of the present invention, the following effects can be obtained. (1) The cavity created by the operation of the cavitator provided in the center of the nozzle hits the surface of the object together with the jet flow, such as cleaning and coating peeling, and is cleaned by erosion when it collapses.
Enhance paint peeling effect.

(2) Since the swirling blade is disposed between the outer periphery of the cavitator and the inner wall surface of the nozzle, a swirling component is given to the jet flowing through the nozzle, so that the cavities gather at the center of the jet and come into contact with the inner surface of the nozzle. Without this, damage to the inner surface of the nozzle can be prevented.

(3) Further, by connecting a vibrator to the cavitator and vibrating the cavitator up and down by the vibrator, the cavity changes due to the vibration, and large bubbles are present in the jet. When this collides with the surface of the object, it collapses at once as a large bubble and gives a large impact force, so that the effect of cleaning and coating peeling is further improved.

[Brief description of the drawings]

FIG. 1 is a side view of a water jet nozzle according to a first embodiment of the present invention.

FIG. 2 is a side view of the water jet nozzle according to the second embodiment.

FIG. 3 is a side view of a water jet nozzle according to the third embodiment.

FIG. 4 is a schematic sectional view of a conventional water jet nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle 2 Cavitator 3 Cavity 4 Cavity bubble 5 Jet jet 6 Water flow 7 Object surface 8 Rotating blade 9 Exciter 11 Large cavity bubble

Claims (2)

(57) [Claims] 1. A water jet nozzle used for cleaning, coating peeling, and the like, wherein a cavitator for generating cavitation in a jet jet supplied into the nozzle is provided at a central portion inside the water jet nozzle. A water jet nozzle having a swirl vane disposed on an outer periphery of a cavitator and an inner wall surface of a nozzle, and a rear end of the cavitator positioned at an outlet throttle portion of the nozzle downstream of the swirl vane. 2. The water jet nozzle according to claim 1, wherein a vibrator for applying vibration to the cavitator is connected to a front end of the cavitator disposed at an inner central portion of the water jet nozzle.