JPH1057845A - Cavitation nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve washing power and peeling power by strengthening cavitation by forming a core and a hole part to generate a turbulent liquid flow in a nozzle in which the cavitation is generated in a liquid flow supplied into the hole part in the downstream side clearance between the core and the hole part of a nozzle main body. SOLUTION: A turbulent flow is generated together with caviation by a taper 4 formed in the downstream side of a core 2 which is at the center of the revolving flow of a high pressure liquid flow A which is induced by a blade 3. The cavitation of a cavitation liquid flow B released from a nozzle main body 1 by the turbulent flow is strengthened, and its washing power and peeling power are improved. In the core 2, a step difference is formed in a downstream side part, the diameter of the downstream side part is made smaller than the diameter of an upstream side part, and unevenness is formed on the surface of the downstream side part of the core 2 close to the connecting part between the funnel-shaped part 1b of the nozzle main body 1 and an outlet part 1c so that the cavitaion of a cavitation liquid flow B can be strengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cavitation nozzle used for cleaning, peeling off paint, and the like.

[0002]

2. Description of the Related Art A conventional cavitation nozzle applied to cleaning, coating peeling, and the like will be described with reference to FIG. The nozzle body 1 is provided with a hole described below. That is, the nozzle main body 1 has a circular inlet section 1a to which the high-pressure liquid flow A is supplied from the upstream side, is connected concentrically to the downstream side of the inlet section 1a, and has a circular cross section whose downstream side sequentially decreases. A funnel-shaped portion 1b and an outlet portion 1c which is concentrically connected to the downstream side of the funnel-shaped portion 1b and has a circular cross-section opening at the downstream end of the nozzle body 1 are provided.

A blade 3 having a columnar core 2 is housed in the entrance 1a, and the core 2 is a funnel-shaped portion 1b.
The inside extends downward in the outlet 1c, and a small gap is formed between the downstream portion of the core 2 and the inner surface of the outlet 1c.

In this cavitation nozzle, a swirl flow rectified by the blades 3 is generated in the high-pressure liquid flow A supplied into the inlet 1a, and the downstream end portion of the core 2 located at the center of the swirl flow and the outlet Cavitation is generated in the gap between the inner surface of the portion 1c and the cavitation liquid flow B is discharged from the nozzle body 1.

[0005]

In the above-mentioned conventional cavitation, cavitation is generated in a portion downstream of the core 2 in the swirling flow rectified by the blades 3, and cavitation occurs in the rectified swirling flow. As a result, strong cavitation did not occur, and there was a limit to the cleaning ability and peeling ability by the cavitation liquid flow.

An object of the present invention is to provide a cavitation nozzle capable of solving the above problems.

[0007]

SUMMARY OF THE INVENTION The present invention comprises a core housed in a hole in a nozzle body having a reduced lower end and an open downstream end, wherein a core and a downstream portion of the hole in the nozzle body are provided. In the cavitation nozzle that generates cavitation in the liquid flow supplied into the hole of the nozzle body in the gap, the core and the hole of the nozzle body are configured to generate turbulence in the liquid flow. I do.

In the present invention, in the liquid flow supplied into the hole of the nozzle body, a turbulent flow occurs in the liquid flow supplied into the hole of the nozzle body at the core and the hole of the nozzle body. This turbulent flow causes flow velocity fluctuations and pressure fluctuations in the gap between the core that generates cavitation in the liquid flow and the downstream portion of the nozzle body. Due to the fluctuation of the flow velocity and the pressure, the intensity of the generated cavitation becomes uneven in time and space. The cleaning action by the cavitation of the reinforced part of this uneven cavitation,
Since the peeling action and the like are large, cavitation is strengthened as a result, and the ability of cleaning and peeling is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. In the present embodiment, the conventional cavitation nozzle shown in FIG. 7 is improved as follows. That is, in the present embodiment, a taper 4 reaching the downstream end of the core 2 is provided at the downstream portion of the core 2 so that the diameter decreases toward the downstream side.

In the present embodiment, the core 2 at the center of the swirling flow of the high-pressure liquid flow induced by the blades 3 generates turbulence together with cavitation due to the taper 4 provided on the downstream side thereof.

The turbulence generated by the taper 4 enhances the cavitation of the cavitation liquid flow discharged from the nozzle body 1, thereby improving the cleaning ability and the peeling ability.

A second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the conventional cavitation nozzle shown in FIG. 7 is improved as follows. That is, in the present embodiment, a step 5 is provided on the downstream side of the core 2.
The diameter of the downstream portion of the core 2 is made smaller than the diameter of the upstream portion of the core 2.

In the present embodiment, a turbulence is generated in the swirling flow of the high-pressure liquid flow induced by the blade 3 together with cavitation on the downstream side by the step 5, and the cavitation liquid flow B discharged from the nozzle body 1 is generated. Cavitation can be strengthened and its cleaning ability and peeling ability can be improved.

A third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the conventional cavitation nozzle shown in FIG. 7 is improved as follows. That is, in the present embodiment, irregularities 6 are formed on the surface of the downstream portion of the core 2 in the vicinity of the portion where the funnel-shaped portion 1b and the outlet portion 1c of the nozzle body 1 are connected.

In the present embodiment, a turbulent flow is generated in the swirl flow induced by the blades 3 on the downstream side of the unevenness 6 to enhance the cavitation of the cavitation liquid flow B discharged from the nozzle body 1 and its cleaning ability. And the peeling ability can be improved.

A fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the conventional cavitation nozzle shown in FIG. 7 is improved as follows. That is, in the present embodiment, the inner wall of the outlet 1c of the nozzle body 1 is provided with irregularities 7.

In the present embodiment, a turbulent flow is generated in the swirl flow induced by the blades 3 on the downstream side of the unevenness 7, and the cavitation of the cavitation liquid flow B discharged from the nozzle body 1 is enhanced, and its cleaning ability is improved. And the peeling ability can be improved.

A fifth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the conventional cavitation nozzle shown in FIG. 7 is improved as follows. That is, in the present embodiment, a step 8 is provided at a portion near the downstream end of the core 2 on the inner surface of the outlet 1c of the nozzle body 1 so as to increase the diameter of the downstream end of the outlet 1c. .

In the present embodiment, a turbulent flow is generated in the swirl flow induced by the blades 3 on the downstream side of the step 8, so that the cavitation of the cavitation liquid flow B discharged from the nozzle body 1 is enhanced, and its cleaning ability is improved. And the peeling ability can be improved.

A sixth embodiment of the present invention will be described with reference to FIG. This embodiment is a fifth embodiment of the present invention.
In place of the step 8 of the embodiment, the diameter of the downstream side is enlarged to the inner surface of the outlet 1c from the portion near the downstream end of the core 2 of the outlet 1c of the nozzle body 1 to the downstream end of the outlet 1c. A taper 9 is provided.

Also in the present embodiment, a turbulent flow is generated in the swirling flow induced by the blade 3 by the taper 9,
Cavitation liquid flow B discharged from nozzle body 1
Cavitation can be enhanced, and its cleaning ability and peeling ability can be improved.

[0022]

According to the present invention, since the structure described in the claims is provided, the liquid flow supplied into the hole of the nozzle body at the core and the hole of the nozzle body is provided. A turbulent flow is generated in the liquid flow, and a flow velocity fluctuation and a pressure fluctuation are generated in a gap between a core that generates cavitation in the liquid flow and a hole portion of the nozzle body on a downstream side. This causes temporal and spatial non-uniformity in the cavitation generated in the liquid flow. Since the cleaning effect and the peeling effect due to the cavitation of the strengthened portion in the uneven cavitation are large, the cavitation is enhanced as a result, and the cleaning ability and the peeling ability can be improved. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a fourth embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a fifth embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a sixth embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a conventional cavitation nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle main body 1a Inlet part 1b Funnel part 1c Outlet part 2 Core 3 Blade 4 Taper 5 Step 6 Unevenness 7 Unevenness 8 Step 9 Taper A High-pressure liquid flow B Cavitation liquid flow

Claims (1)

[Claims] A core is accommodated in a hole of a nozzle body whose downstream side is reduced and a downstream end is opened, and a core is provided in a hole of the nozzle body in a gap between a core and a downstream portion of the hole of the nozzle body. A cavitation nozzle for generating cavitation in a supplied liquid flow, wherein the core and the hole of the nozzle body are configured to generate turbulence in the liquid flow.