JPH0630514A - Wire passing method - Google Patents

Abstract

PURPOSE:To provide a wire passing method employing Coanda spiral flow through which a wire can be passed easily and highly efficiently through a large diameter conduit by placing an air bag in a space defined between an ejection port and the wall of large diameter conduit and then sealing the space hermetically. CONSTITUTION:A Coanda spiral flow wire passing apparatus 1 comprises a Coanda spiral flow unit 2 to be coupled with a large diameter conduit 8 for passing a conductor or the like. Compressed air is then fed from a compressed air supply means 6 to the unit 2 in the wire passing direction through an annular Coanda slit thus automatically transferring (passing) the conductor on the Coanda spiral flow through the conduit. An air bag body 3 is placed in a space defined by the conduit 8 and the unit 2 and compressed air is fed into the air bag body 3 to inflate the air bag body 3 thus sealing the space hermetically. This method prevents intrusion of air at the time of passing wire thus realizing stabilized passing of wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring method. More specifically, the present invention, when conducting a wire in a conduit using a Coanda spiral flow conduit, even if it is a large diameter conduit having a bent portion, an existing small diameter conduit is used. The present invention also relates to a wiring method that enables long-distance wiring to be carried out easily and efficiently, even when the above are provided.

[0002]

[Prior art and its problems] Conventionally, factories, communication facilities,
In chemical plants and the like, conducting wires and the like are often used for long distances in pipelines. These wires are intended to be, for example, wires for electric wiring in factories, wires for optical fiber cables in communication facilities, and wires for controlling plants in chemical plants. And, the wiring method for that purpose is elaborately devised. For example, as the conventional wiring method, there are a) a method using compressed gas,
B) There is a method that does not use compressed gas.

As an example of the former method of using compressed gas, a parachute or stopper for closing the entire cross section of the pipe is attached to the tip of a conducting wire or the like, and the inlet of the pipe is closed with an iron plate or the like, so that high pressure gas leaks from the inside of the pipe. In general, a high-pressure gas is supplied to this pipe line and a conductor or the like is pressure-fed to pass the wire. However, when using this compressed gas, the speed of the parachute, stopper, etc. protruding at the outlet of the conduit becomes extremely high, which is very dangerous. Further, the supply device for supplying the high-pressure compressed gas also becomes large in scale, and under the present circumstances, it is desired to reduce the pressure as much as possible before conducting wiring. However, if this wire is tried to be run at a low pressure, it may not be possible due to the frictional resistance between the parachute, stopper, etc. and the pipe wall. Therefore, if the parachute, stopper, etc. are miniaturized to the extent that they do not cover the entire cross section of the pipe, or if the parachute, stopper, etc. are not provided and the wire is run at low pressure, the tip of the conductor, etc. will vibrate violently. The conductor wire or the like will be damaged due to friction or the like caused by collision with the pipe wall or contact. Further, when the pipe has a bent portion, the conductive wire or the like is caught at the bent portion during the conveyance by the compressed air, and the wire cannot be passed. This is because the supply gas is a normal turbulent flow, so that the conductor wire or the like cannot be controlled well around the axis.

Further, when there is an existing conducting wire in the pipeline, the pipeline inlet cannot be completely closed with an iron plate or the like, and the compressed gas inside the pipeline leaks to the outside. is there. On the other hand, as an example of a method that does not use compressed gas, attach a bobbin or the like to the tip of a wire or the like to forcibly push in the conductor wire, or pull the conductor wire manually, or use a transfer robot with wheels. The running method and the like are known. However, in this manual method, the conductor wire is often pushed or pulled by hand so that the conductor wire is difficult in many cases, and even if the conductor wire can be managed in a short distance, the work labor becomes great. Further, in a self-propelled method using a transfer robot, it is difficult to give this transfer robot a function of automatically bending at a bending portion, or to manufacture a transfer robot that climbs even in a vertically bent pipe, Too costly.
Further, even in a straight pipe, if mud, water, or the like is accumulated in the straight pipe, the transport robot may not be able to go straight, so that the use of the transport robot is limited.

For this reason, each method has a limit. However, even with a thin tube having a large number of bends,
The present inventor has already proposed a new line-passing method and a device therefor which can solve the above-mentioned problems and can easily and efficiently carry out long-distance lines. In this method, the inventor of the present invention uses Coanda spiral flow, which is being actively studied for application to various application fields, as a principle method for the passage.

That is, this Coanda spiral flow exhibits a so-called steeper velocity distribution in which the velocity difference between the axial flow of gas and its surroundings and the density difference are large, the pipe axis flow is fast and the outer flow is slow. . Furthermore, for example, the turbulence shows a value of 0.09, which is less than half the value of 0.2 for normal turbulence, and is characterized by forming a state different from normal turbulence. Moreover, there is a characteristic that a unique Coanda spiral flow is formed by combining the axial vector and the radial vector.

Therefore, by utilizing the fact that this Coanda spiral flow is a flow converging on the pipe axis in the pipe flow, there is provided a wire passing device capable of easily and efficiently conducting a conductor wire over a thin pipe having a large number of bent portions over a long distance. Has already been developed.
FIG. 2 is a schematic diagram showing a wire passing method already proposed by the inventor and an apparatus therefor.

For example, as shown in FIG. 2, a Coanda spiral flow unit (c) is connected to a predetermined conduit (a) for passing a conductor or the like through a flexible hose (a) or the like. . Compressed gas is supplied to the Coanda spiral flow unit (c) from the compressed gas supply means (e) through the annular Coanda slit (d) in the passage direction of the conduit (a). In this state, a predetermined conducting wire (K) is inserted into the suction introduction port (F) of the Coanda spiral flow unit (C).

The conductive wire (K) is automatically conveyed by the flexible hose (A) and the Coanda spiral flow in the pipe line (A), and the friction between the conductive wire (K) and the pipe wall is small, and the wire travels at high speed. An air compressor is generally used as the compressed gas supply means (e), but a gas cylinder or the like may be used if the pressure is low.

Coanda spiral flow unit (C)
For, regarding the annular Coanda slit (D) between the connection port (H) to the conduit and the suction introduction port (F) for introducing the conducting wire (K), the inclined surface (K) near it, compressed gas The structure having the distribution chamber (U) and the compressed gas supply path (S) can be shown as a typical example. By setting the angle of the inclined surface (5) to, for example, about 5 to 70 °, a Coanda spiral flow is formed and a strong negative pressure suction force is generated at the suction introduction port (f), and as a result, this negative pressure suction force is generated. Leads the lead wire. This conductor is passed through the pipe (a) of FIG. 2 at high speed by the Coanda spiral flow.

The wire passing method and the apparatus therefor as described above make it possible to wire easily and efficiently in a thin tube having a large number of bent portions, and exhibit extremely superior effectiveness to the conventional method. However, it has become clear from the study by the inventor thereafter that there are points to be further improved in the case of this wire passing method by Coanda spiral flow and its apparatus. It has a diameter of 200 mm
In the case of a large diameter that exceeds the above, if the outlet diameter of the Coanda spiral flow unit (c) is adjusted to the diameter of the conduit, not only will the Coanda spiral flow unit (c) become huge and difficult to handle, To obtain a highly stable Coanda spiral flow that converges on the shaft by using this enormous Coanda spiral flow unit, it is necessary to make the supply gas extremely high pressure. Furthermore, if there is a small-diameter conduit or lead wire in this large-diameter conduit beforehand, there is the problem that a Coanda spiral unit with the same jet outlet diameter as the large-diameter conduit cannot be connected to the large-diameter conduit. is there.

When a Coanda spiral flow unit equipped with a small-diameter jet is provided in this large-diameter conduit, when attempting to run a wire, the large-diameter conduit (C) and the Coanda spiral flow unit (C) are used. Air flows in from between the space and, and the inflowing air makes the Coanda spiral flow unstable, resulting in a normal turbulence with a large degree of turbulence, which causes a problem that the wire cannot be efficiently passed. In addition, in order to prevent this inflow, it is possible to completely seal with an iron plate etc., but in this case, if there is a small-diameter pipe line or other conducting wire in this large-diameter pipe line in advance,
There is a problem that it cannot be completely sealed.

The present invention has been made in order to solve the problems as described above, and is a large-diameter conduit, and even if the conduit is bent, long-distance wiring can be performed easily, efficiently and safely. It is an object of the present invention to provide a wire passage device capable of performing.

[0014]

In order to solve the above-mentioned problems, the present invention provides a wire for a Coanda spiral flow or its guide wire, wherein the outer periphery of a jet port of a Coanda spiral flow wire device and a pipe Pipe wall of the road,
Further, there is provided a wire passing method, wherein an air bag is mounted and filled in a space existing between a small-diameter conduit existing in the conduit or a lead wire or the like if necessary.

[0015]

According to the present invention, an air bag made of a soft plastic film or the like is provided in the space between the pipe wall of the pipe and the small-diameter pipe existing in the large-diameter pipe or the lead wire in advance. Is inflated with compressed gas to seal this space and prevent air from entering into the pipeline. As a result, even in a large-diameter conduit, a Coanda spiral unit having a small-diameter jet port can be used for long-distance wiring in a simple, efficient and safe manner.

Hereinafter, the present invention will be described in more detail with reference to examples.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a Coanda spiral flow wire connecting method according to the present invention by mounting an air bag. For example, as illustrated in FIG. 1, the Coanda spiral flow wire passing device (1) includes a Coanda spiral flow unit (2) an air bag body (3) made of a soft plastic film or the like, a gas intake and exhaust device. Flexible supply and discharge valves (4), a tube (5) connecting the supply and discharge valve (4) and the airbag body (3), and a flexible connection between the supply and discharge valve (4) and the compressed gas supply means (6). It is equipped with a tube (7).

The material of the airbag body (3) is preferably a soft plastic film or the like. Any soft and durable material such as high molecular weight organic material such as polyethylene can be used. The airbag body (3) is inflated to seal the space between the cross section of the large diameter conduit (8) and the Coanda spiral unit (2).

The compressed gas supply means (6) may be operated by injecting air from a person's mouth when it is not necessary to inflate the airbag so much. Generally, the compressed gas supply means (6) is a Coanda spiral unit (2).
It can also be shared via a branch valve (9) with that for supplying to. Of course, a compressed gas supply means (6) may be newly provided exclusively for the air bag supply.

When the gap between the Coanda spiral flow unit and the pipe wall of the large diameter pipe line (9) is very large,
It is also possible to use a plurality of airbag bodies (3).
Further, the airbag main body (3), which becomes circular when inflated, may be adhered to a short pipe having the same diameter as the ejection port of the Coanda spiral flow unit in advance. By doing so, it is possible to completely prevent the inflow of gas from the gap between the airbag body (3) and the Coanda spiral flow unit (2).

In addition, several small-diameter pipes (11), conductors, and the like are preliminarily provided in one large-diameter pipe, and even when new conductors and the like are additionally provided, this airbag It is possible to prevent the inflow of air through the gap by using some main bodies (3). Further, when conducting a wire through a large-diameter conduit, a parachute, a stopper, or the like may or may not be attached to the tip of the conductor or the like. The parachute or stopper may cover the entire cross section of the pipe, or may be small enough not to cover the whole. Even if you don't attach anything to the tip of the conductor, the conductor will be attracted to the center of the shaft due to the nature of spiral flow,
It is very stable and does not come into contact with the wall of the tube, and it can be transported smoothly even at bends.

Actually, the Coanda spiral flow wire passing device (1) with an air bag shown in FIG. 1 is used, and a pipe line made of plastic having a diameter of 200 mm and a length of 120 m has a diameter of 2 mm. I passed the conductor. The Coanda spiral flow wire passage device (1) used has an air bag body (3) mounted around the ejection port of the Coanda spiral flow unit (2) as shown in FIG. The diameter of the outlet is 20 mm. Also, nothing is attached to the tip of the conductor.

Compressed air having a pressure of 10 kg / cm ² was supplied from an annular Coanda slit to conduct a wire. As a result, the line was completed in about 1 minute. At this time, air did not flow in between the wall of the large-diameter conduit (8) and the airbag body (3). Furthermore, by observing the movement of this conducting wire in the middle of the pipe, it was confirmed that the conducting wire existed in the center of the pipe and there was little vibration and no friction with the pipe wall.

[0024]

As described above in detail, according to the present invention, even when conducting a conductor such as a conductor in a large-diameter conduit, (a) spiral flow can be maintained for a long time (a) conductor can be conducted at low pressure ( C) Conducting is possible even in pipelines with bent parts. (D) Conducting is possible even if existing small-diameter pipelines, conductors, etc. are installed. The effects such as the above can be obtained, and simple, efficient, and safe long-distance wiring can be performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a device of the present invention.

FIG. 2 is a cross-sectional view exemplifying a wiring method already proposed by the inventor.

[Explanation of symbols]

 1 Coanda spiral flow passage device 2 Coanda spiral unit 3 Air bag body 4 Supply / discharge valve 5 Tube 6 Compressed gas supply means 7 Flexible tube 8 Large diameter pipe line 9 Branch valve

Claims (1)

[Claims] 1. In a conductor of a Coanda spiral flow or a conductor thereof, the outer periphery of a jet outlet of a Coanda spiral flow passage device, a pipe wall of a pipe, and, if necessary, existing in the pipe beforehand. A wiring method, characterized in that an air bag is mounted and filled in a space between a small-diameter conduit or a conductor.