JPS6353861B1 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a liquid injection device suitable for, for example, spraying high-pressure water to clean the inner wall surface of a tunnel.

[Conventional technology]

The liquid injection device used for this type of application is
An injection nozzle having a single injection hole is surrounded by a peripheral wall and the cleaning water is sprayed in a pattern defined by the inner surface of the peripheral wall, and a nozzle with a large number of injection holes has a formation pattern of the injection holes. A device is known in which cleaning water is sprayed according to the following.

[Problem to be solved]

However, among the liquid ejecting devices configured as described above, the former has an ejection pattern in which the flow rate gradually increases toward the outside, making it impossible to perform efficient cleaning. In the latter case, the former problem can be solved to some extent by increasing the number and spacing of the injection holes, but this requires the cleaning water to be introduced uniformly to each injection hole, which requires a different configuration. It had the disadvantage of being complicated and large.

Therefore, an object of the present invention is to provide a liquid ejecting device that is capable of ejecting liquid such as cleaning water in a substantially uniform pattern at any location without having a large and complicated configuration. .

[Means and actions to solve the problem]

The liquid ejecting device of the present invention includes: an inner circumferential wall that widens toward the front; an outer circumferential wall that is provided at a predetermined distance from the outer surface of the inner circumferential wall and has a gas passage formed therebetween; a liquid injection nozzle that is provided at a rear part of the inner peripheral wall and injects liquid toward the front within the inner peripheral wall; a gas chamber that is provided at the rear part of the gas passage and into which high-pressure gas is introduced from the outside; and the inner peripheral wall. A large number of openings are formed at predetermined intervals in the circumferential direction and the front-back direction, respectively, to guide a part of the high-pressure gas passing through the gas passage into the inner peripheral wall and to regulate the outer periphery of the gas jet flow from the injection nozzle. It is characterized by comprising the following.

In the liquid ejecting device having the above configuration, the liquid ejected from the liquid ejecting nozzle is first sequentially ejected from a large number of openings arranged in the front and back direction within the inner circumferential wall.
The high-pressure gas supplied along the liquid flow prevents it from spreading to the outer periphery, and when it is next injected from the inner peripheral wall, the spread is regulated by the synergistic effect of the high-pressure fluid and the high-pressure fluid from the gas passage. be done. In addition, the fluid jetted from the liquid jet nozzle is
The liquid is mixed with surrounding high-pressure gas to form a mist, which is then injected from a liquid injection nozzle.

The liquid injection device of the present invention also includes an inner circumferential wall that widens toward the front, and an outer circumferential wall that is provided at a predetermined distance from the outer surface of the inner circumferential wall and that forms a gas passage therebetween. , a liquid injection nozzle provided at the rear part of the inner circumferential wall and injecting liquid toward the front within the inner circumferential wall; and a first gas chamber provided at the rear part of the gas passage and into which high-pressure gas is introduced from the outside. , a second gas chamber defined between the injection nozzle and the inner circumferential wall; and a first gas chamber formed at the rear of the inner circumferential wall and guiding a part of the high-pressure gas in the first gas chamber to the second gas chamber. The opening and the inner peripheral wall are formed at predetermined intervals in the circumferential direction and the front-rear direction, respectively, to guide a part of the high-pressure gas passing through the gas passage into the inner peripheral wall and regulate the outer periphery of the gas jet flow from the injection nozzle. It is characterized by comprising a large number of second openings.

In the liquid injection device of the second configuration, in addition to the action of the first configuration, the liquid immediately after being injected from the nozzle also spreads outward due to the high pressure gas from the second gas chamber. is prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The liquid injection device I includes an inner pipe having an inner circumferential wall 9 that gradually widens toward the front. This inner peripheral wall 9 has a rectangular cross section that spreads in the left and right direction, and has a spread angle (α, β).
are set at approximately 2 degrees and approximately 12.5 degrees to 15 degrees, respectively. The rear part of this inner pipe is widened, and a liquid injection nozzle 1 is provided coaxially therein with the injection hole 2 facing forward. A male thread 12 is formed at the base end of the liquid injection nozzle 1, and is screwed into a female thread and a nut 3 in a cylinder protruding from the rear end plate. As a result, the position of the liquid jet nozzle 1 can be adjusted in the axial direction. A pipe 4 connected to a high-pressure liquid source, for example, a cleaning water source, is connected to the cylinder of the rear end plate, and the high-pressure liquid is supplied to the liquid injection nozzle 1 from the direction indicated by the symbol W1 through this pipe. and is injected from the injection hole 2 into the inner circumferential wall 9 as indicated by the symbol W2. Further, the inner surface of the rear end of the inner pipe and the outer peripheral surface of the liquid injection nozzle 1 are separated by a predetermined distance, and a gas chamber (second gas chamber) 6 is defined between them.

An outer pipe having an outer circumferential wall 8 surrounding the outer circumference of the inner circumferential wall 9 at a predetermined interval is connected to the rear end plate at its rear end. This outer circumferential wall 8 has a substantially similar shape to the inner circumferential wall 9, and defines a gas passage 7 having a rectangular cross section therebetween. A gas chamber (first gas chamber) 13 defined between the rear portions of the outer pipe and the inner pipe is provided at the rear of the gas passage 7. This first gas chamber 13 is connected to a pipe 5 connected to a high pressure gas source, and the high pressure gas is supplied to the first gas chamber 1 through this pipe 5.
3, from the direction indicated by symbol A.

A first opening 10 and a second opening 14 are formed in the inner pipe. The first opening 10 is
It is formed at the rear so that the first gas chamber 13 and the second gas chamber 6 communicate with each other. On the other hand, a large number of the second openings 14 are formed in the inner peripheral wall 9 so as to be spaced apart from each other in the circumferential direction and the front-back direction. The second openings 14 each have a small diameter and are formed obliquely toward the front from the gas passage 7. As a result, pipe 5
The high pressure gas introduced into the first gas chamber 13 is
The first portion a1 is injected to the outside from the front surface of the gas passage 7, and the first portion a1 is led to the second gas chamber 6 through the first opening 10, and immediately after being injected from the liquid injection nozzle 1. When passing through the gas passage 7 and the second portion acting on the outer periphery of the injected liquid, the liquid is guided inside the inner circumferential wall 9 through the second opening 14,
It is divided into a third part which acts on the outer periphery of the jetted liquid passing through this part. The second portion and the third portion are injected from the front surface of the inner circumferential wall 9 at an angle of 7 degrees, and even after the injected liquid is injected from the front surface of the inner circumferential wall 9, as shown by reference numeral a2, the liquid remains around this area. located to prevent the outward spread of the jetted liquid.

In addition, in the figure, the code|symbol 11 shows the flange for attachment.

In the liquid injection device with the above configuration, a large tunnel (implementation location, Otsuki Tunnel, length 499 m, height
The results of actually cleaning the inner surface of the wall of 7m) are explained below.

The liquid injection device had a rectangular appearance of 65 mm x 15 mm and a length of 90 mm in the front-back direction, and was used close to the inner surface of the wall within a range of 550 mm to 100 mm. The liquid injection nozzle 1 used had an elliptical injection hole 2 with a diameter of 0.8 mm, and cleaning water at a pressure of 500 kg/cm ² was supplied thereto. In the first gas chamber 13,
Compressed air was supplied at 5Kg to 8Kg/cm.

This result shows that, as shown by the solid line a in FIGS. 2 and 3, a substantially uniform amount of cleaning liquid is applied to the inner surface of the wall in the height direction as well as in the left and right directions, compared to the conventional method shown by the dashed line b. I was able to spray it.

〔Effect of the invention〕

The liquid ejecting device of the present invention has a simple configuration and can efficiently eject liquid at a uniform flow rate over a wide range without having to make it large.

[Brief explanation of the drawing]

The figures show a liquid ejecting device according to an embodiment of the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a cross-sectional view, and FIG. 3 is a vertical cross-sectional view. I...Liquid injection device, 1...Liquid injection nozzle,
2...Injection hole, 6...Second gas chamber, 7...Gas passage, 8...Outer peripheral wall, 9...Inner peripheral wall, 10...
...first opening, 13...first gas chamber, 14...
Second opening.

Claims (1)

[Claims] 1. An inner circumferential wall that widens toward the front, an outer circumferential wall that is provided at a predetermined distance from the outer surface of the inner circumferential wall, and that forms a gas passage therebetween; a liquid injection nozzle that is provided at the rear of the peripheral wall and injects liquid toward the front within the inner peripheral wall; a gas chamber that is provided at the rear of the gas passage and into which high-pressure gas is introduced from the outside; A large number of openings are formed at predetermined intervals in the circumferential direction and the front-back direction, respectively, to guide a part of the high-pressure gas passing through the gas passage into the inner peripheral wall and to regulate the outer periphery of the gas jet flow from the injection nozzle. Liquid injection device with. 2. An inner circumferential wall that widens toward the front, an outer circumferential wall that is provided at a predetermined distance from the outer surface of the inner circumferential wall, and that forms a gas passage therebetween, and an outer circumferential wall that is provided at the rear of the inner circumferential wall. a liquid injection nozzle which injects liquid toward the front within the inner circumferential wall; a first gas chamber provided at the rear of the gas passage into which high-pressure gas is introduced from the outside; the injection nozzle and the inner circumferential wall; a second gas chamber defined between the inner circumferential wall; a first opening formed at the rear of the inner circumferential wall and guiding a portion of the high-pressure gas in the first gas chamber to the second gas chamber; A large number of second openings are formed at predetermined intervals in the direction and the front-back direction, respectively, to guide a part of the high-pressure gas passing through the gas passage into the inner peripheral wall and to regulate the outer periphery of the gas jet flow from the injection nozzle. A liquid injection device having.