WO1989012512A1

WO1989012512A1 - Nozzle tool

Info

Publication number: WO1989012512A1
Application number: PCT/FI1989/000094
Authority: WO
Inventors: Matti Ollikainen
Original assignee: Matti Ollikainen
Priority date: 1988-06-17
Filing date: 1989-05-23
Publication date: 1989-12-28
Also published as: FI882917A0; FI882917L; FI882917A7

Abstract

The invention concerns a nozzle tool for cleaning of pipe lines and for opening of blockages. The nozzle tools are intended for mounting at the end of a pressure-medium hose, such as a pressure-water hose. In the nozzle, a transverse movement of vibration has been achieved by into the nozzle forming one or several medium flow ducts (2a, 2b) directed transversely, the flow that takes place through said ducts being interrupted periodically. The interrupting member may be, e.g., a turbine member (3a) placed inside the nozzle and obtaining its circulatory movement from the flow of medium.

Description

Nozzle tool

The invention concerns a nozzle tool which is used for cleaning of pipe lines and for opening of blockages in same, being connected to a source of pressure medium by the intermediate of a hose or pipe.

Nozzle tools of the sort concerned are known in themselves as various modifications. A common medium in connection with these nozzle tools is high-pressure water. The nozzles include flow ducts directed in different ways, high-pressure water jets flowing out of said ducts and the desired cleaning and opening effects being supposed to be achieved by means of said flow ducts. Some of the flow ducts are usually directed slightly rearwards so as to produce a self-transportation force of the nozzle and to intensify the washing-off of detached impurities.

In many purposes of use, these prior-art nozzle tools operate sufficiently reliably. However, it is a drawback of these nozzle tools that their cleaning and opening effects are exclusively based on the collision energy of the water jets. This is why these tools must be operated with quite high pressures, even pressures of up to about 1500 bars have had to be used in difficult objects. High operating pressures result in expensive operating equip¬ ment, whose use further involves its own drawbacks, such as high cost and noise. Nor is working within this range of pressure free of risks.

Nozzle tools are also known in which the cleaning effect of the nozzle has been intensified by producing a recipro¬ cating impact movement for the nozzle. This impact movement has been produced by means of members placed in the interior of the nozzle, which receive their operating power from the pressure medium used for the cleaning, such as pressurized water. A nozzle tool belonging to this group of apparatuses is described, e.g., in the German Published Patent Application No. 1,600,547. In one embodiment of this device, a reciprocating radial impact movement has been produced by means of two discharg openings for the pressure medium, placed at opposite --sides on the diameter of the nozzle, a swinging needle- valve member being placed in the interior of the nozzle to close the openings alternatingly.

As compared with nozzles based on water jets alone, in spite of the improved cleaning effect, it can be considere a drawback of a nozzle tool of said sort that, in the nozzle a reciprocatingly oscillating impact movement can be produced only as linear in one direction of diameter. A further constructional drawback of said nozzle tool is wear of the needle-valve type impact members.

The nozzle tool subject of the present application belongs to the basic type whose cleaning operation is also based on an oscillating impact action in addition to the jet energy cleaning by the medium.

Said mechanical, oscillating impact action of the nozzle tool to be mounted at the end of a pressure-medium hose or pipe is achieved by constructing the closing member as revolving around the longitudinal axis of the nozzle tool, in which said tool at least one flow duct for the medium is passed from the interior of the tool, which communicate with the pressure-medium hose, through the wall of the tool in a direction diverging from the direction of the longitudinal axis of the tool, which said duct, or at least one of the flow ducts, is provided with a member for periodic closing of the flow duct, said member receiving its operating power from the medium flow.

The construction concerned permits locating of the flow ducts that produce the movement of oscillation in a higher number of directions on the circumference of the nozzle tool so that the flow in these flow ducts and its altera¬ tions do not hamper the operation of the other ducts or of the member that closes the flows. Further, the device of said type can be constructed as mechanically substan¬ tially more durable than a closing member that performs a reciprocating movement and produces impacts in itself.

The invention will be described with the aid of the accompanying drawing, wherein

Figure 1 is a sectional view of a nozzle tool in accordanc with the invention showing two alternative embodiments of the nozzle tool, and

Figure 2 shows a cross section of the tip portion of the nozzle tool.

The basic construction of the nozzle tool shown in Fig. 1 is similar to the construction of the prior-art nozzle tools used for a corresponding purpose. The tool has a hollow cylindrical body 1 , which is open at both ends . One end of the body is provided with a connector piece 4 for connecting the nozzle tool to the hose arriving from the source of pressure medium. To the opposite end of the body, the tip cone 4 is connected, through which the medium flow duct 8 is passed in the embodiment shown. In addition to this flow duct, in a customary way, the nozzle tool may have one or several flow ducts directed as inclined rearwards, by means of which the movement of progress of the nozzle tool is produced in the pipe to be cleaned.

In view of accomplishing the main principle of the inven¬ tion, in the embodiment shown, two opposite flow ducts 2a and 2b are passed through the wall of the body 1 , which said ducts are substantially perpendicular to the longi¬ tudinal axis of the nozzle tool. According to one embodi¬ ment of the invention, a member 3a is fitted inside the nozzle. In the embodiment shown, this member is similar to a turbine wheel and is placed as loosely revolving inside the nozzle. To operate this turbine member, the flow of the pressure medium is guided through a central duct 5 provided in the connector piece 4 so that the turbine member 3a obtains a movement circulating around the interior of the nozzle on its support base 6. During this movement of circulation, the turbine member covers the flow ducts 2a and 2b momentarily alternatingly, whereb the reaction force of this interrupted flow produces a transversely vibrating movement in the nozzle piece.

Alternating momentary closing of the medium flow ducts 2a and 2b passed out transversely may, in one embodiment, also be produced by means of a member 3b placed outside the nozzle body 1, shown at the left side in the figure. This member may be, for example, a ring placed in a groove in the body and provided with holes directed somewhat tangentially in relation to the ring, the medium flowing out of the ducts 2a, 2b through said holes producing a revolving movement of the ring. When the ducts 2a, 2b are closed alternatingly when facing the solid areas in the ring 3b, a vibrating transverse force of movement corresponding to the turbine alternative described above is obtained.

Differing from the embodiment shown in Fig. 1 , the ring 3b may also be placed inside the nozzle.

In accordance with Fig. 2, the conical tip of the.nozzle tool may be made so that it is provided with sharp ridges 9 so as to intensify the opening effect of the nozzle. In a corresponding way, the tip may be provided with pins or with other, similar members to obtain the desired cleaning and opening effect.

Likewise, the body 1 of the nozzle tool may be provided with various nodules or pins 10 so as to intensify the reciprocatingly cleaning impact effect produced by means of the tool.

Differing from what is shown in Fig. 1, the ducts 2a and 2b may be somewhat rearwards inclined to produce a forward movement of the nozzle. Alternatively, the nozzle may have separate ducts directed rearwards to produce a forwar movement.

Claims

WHAT IS CLAIMED IS:

1. Nozzle tool to be mounted at the end of a pressure- medium hose or pipe for cleaning of the inside face of pipe lines as well as for opening of blockages, at least one flow duct (2a, 2b) for the medium being passed from the interior of the tool, which communicates with the pressure-medium hose, through the wall of the tool, said duct passing in a direction diverging from the direction of the longitudinal axis of the tool, and said duct, or at least one of the flow ducts, being provided with a member (3a, 3b) that receives its operating power from the medium flow for the purpose of periodic closing of the flow duct, c h a r a c t e r i z e d in that the closing member (3a, 3b) revolves around the longitudinal axis of the nozzle tool.

2. Nozzle tool as claimed in claim 1, c h a r a c ¬ t e r i z e d in that the closing member (3b) is placed in the interior of the nozzle tool.

3. Nozzle tool as claimed in claim 1, c h a r a c ¬ t e r i z e d in that the closing member (3a) is placed on the outer circumference of the nozzle tool.