JPH07177630A - Method and apparatus for passing flat type cable - Google Patents

Abstract

PURPOSE:To allow smooth passing of flat type cable by a method wherein a flat type cable of conductor or optical fiber is passed through a conduit by means of a Coanda spiral flow created by a compressed fluid. CONSTITUTION:A Coanda spiral flow created by supplying a compressed fluid from a compressed fluid supply means 5 passes a flat type cable 13 of conductor or optical fiber, introduced from an introduction port 6 through a passage 16 having an annular groove 15 to the region of spiral flow, through a conduit 14 from a jet port 8. The air is employed as the compressed fluid, for example, and the pressure is set appropriately. This method allows smooth passing of the flat type cable 13 using a compressed fluid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat cable passing method and apparatus. More specifically, the present invention provides a simple and highly efficient flat cable for conductors or optical fibers, whether it is a long conduit having a large number of bends or a conduit in which mud or water is accumulated in the conduit. The present invention relates to a new wire passage method and a device therefor capable of passing a wire through a pipeline.

[0002]

2. Description of the Related Art Conventionally, in office buildings, factories, communication facilities, ordinary households, etc., it has been common practice to pass a conductor through a conduit. For that reason, the method of passing wires has been devised. For example, as the known wire passing methods, there are a) a method using a compressed fluid and a) a method not using a compressed fluid. As an example of the former, a method is known in which a compressed fluid is supplied to a pipe to convey a conductor. As an example of the latter, a method is known in which the conductor wire is forcibly pushed in manually with a wire or the like.

However, in the former method, there is a large restriction on the diameter of the pipe that can be passed, and the smaller the pipe diameter, the more difficult the passage. Moreover, long-distance pipelines,
In a pipeline having a large number of bent portions, it is extremely difficult to run the conductor due to the contact between the inner wall of the pipeline and the conductor. In fact, even a 20 m or 30 m long pipeline is often difficult to connect. Furthermore, if mud or water is accumulated in the pipeline,
It is necessary to supply a high-pressure compressed fluid for draining water, which is not only inefficient but also dangerous. Further, in the latter method, since the conductor wire is pushed in manually, it is difficult in many cases to carry the conductor wire, and even if the conductor wire can be managed in a short distance, the work labor is great.

As described above, it is extremely difficult to easily and efficiently conduct a line in the conventional line-carrying technology, and much less in the case of a line in which mud or water is accumulated in the pipe. Even in a short conduit, it was not possible to easily and efficiently run the wire. Therefore, in view of such a situation, the present inventor has already proposed a new wiring method and a device therefor capable of easily and efficiently conducting wiring even with piping having a large number of bent portions. There is. This method uses the Coanda spiral flow, which the present inventor is actively studying about application to various application fields, as a principle method for the passage.

The Coanda spiral flow exhibits a so-called steeper velocity distribution in which the velocity difference between the axial flow of the fluid and its surroundings and the density difference are large, the pipe axis flow is fast and the outer flow is slow, and further, For example, the degree of turbulence is 0.09, which is a half or less of 0.2 of the normal turbulence, and is characterized by forming a state different from the normal turbulence. Moreover, there is a feature that a unique spiral flow is formed by combining the axial vector and the radial vector.

Therefore, the inventor of the present invention utilizes the fact that the Coanda spiral flow having such a characteristic is a flow that converges on the pipe axis in the pipe flow, and therefore the inventor of the present invention uses a conductor even if the pipe has a large number of bent portions. We have developed a line device that allows easy and efficient line connection. FIG. 1 is a schematic view illustrating this new wire passing method and device. For example, as shown in FIG. 1, in a predetermined pipeline (1) for passing a conductor,
The Coanda spiral flow unit (3) is connected with or without the flexible hose (2) or the like. The Coanda spiral flow unit (3) has a conduit (1) through an annular Coanda slit (4).
The compressed fluid is supplied from the compressed fluid supply means (5) in the direction of the line. In this state, a predetermined conductor (7) is inserted into the conductor introducing port (6) of the Coanda spiral flow unit (3). The conducting wire (7) is automatically conveyed by the spiral flow in the pipe line (1), and the friction between the conducting wire (7) and the pipe wall is small, and the passage progresses at high speed.

In this case, an air compressor or a cylinder of compressed fluid such as nitrogen can be used as the compressed fluid supply means (5). Further, as to the Coanda spiral flow unit (3), for example, as shown in FIG. 2, an annular Coanda is provided between the jet port (8) connected to the pipeline and the introduction port (6) of the conducting wire (7). A structure having a slit (4), an inclined surface (9) in the vicinity thereof, a compressed fluid distribution chamber (10), and a compressed fluid supply path (11) can be shown as a typical example.

The angle of the inclined surface (9) is, for example, 5 to 70 °.
Depending on the degree, a spiral flow is formed,
At the same time, a strong negative pressure suction force is generated in the inlet (6), and as a result, the negative pressure suction force guides the conducting wire (7), which leads to the Coanda spiral flow in the conduit (1) of FIG. Is passed by at high speed. The wire passing method and the apparatus as described above enable the wire to be easily and efficiently passed even in a pipe having a large number of bent portions, and is extremely effective as compared with the conventional turbulent flow method.

However, it has become clear from further studies by the present inventors that there are points to be further improved in the case of this wire passing method and its apparatus by the Coanda spiral flow. That is, for example, when a flat cable (13) having a plurality of core wires (12) such as conductor wires or optical fibers as shown in FIG. Although it is possible to run a wire, it is not easy to carry out the wire smoothly, efficiently, and if the conduit that runs the wire is a long conduit, the pressure loss will increase, In the conventional Coanda spiral flow wire passing device, since the carrying force is small, the wire running may not proceed smoothly.

Of course, as a measure against such a problem, it is possible to increase the flow rate by increasing the width of the annular slit or increasing the pressure of the compressed fluid to increase the flow velocity. However, when the flow rate is increased, the pressure inside the Coanda spiral flow unit becomes extremely large, and all the compressed fluid supplied does not flow to the ejection port (8) but flows back to the introduction port (6). A so-called backflow phenomenon will occur. Therefore, the inlet of the Coanda spiral flow unit (6)
A negative pressure region does not occur in the vicinity, and there is a problem that the cable itself cannot be introduced.

The present invention has been made in order to solve the problems as described above, and even in the case of a long pipe line having a bent portion, the conventional turbulent flow system cannot pass the wire. And, the method for enabling the simple and efficient passage of the flat cable as described above, which was not easy to pass even by the conventional Coanda spiral flow method, and the device therefor. It is intended to be provided.

[0012]

In order to solve the above problems, the present invention introduces a Coanda spiral flow produced by supplying a compressed fluid from an introduction port through a passage having an annular groove into the production region. Provided is a method of passing a flat cable, which is characterized in that a flat cable of a conductor or an optical fiber is passed through a conduit.

Further, the present invention provides, as devices therefor, a jet outlet, an inlet for a rectangular cable of a conductor or an optical fiber, and an annular Coanda slit for supplying a compressed fluid for generating a Coanda spiral flow in the pipe direction. ,
And a compressed fluid supply path, wherein a rectangular cable has a rectangular opening at its inlet, and an annular portion is provided between the rectangular opening and the Coanda spiral flow generating section. There is also provided a wire passing device for a rectangular cable, characterized in that a passage having a groove is provided.

Furthermore, the present invention also provides a conduit tube for a rectangular cable itself.

[0015]

That is, in the present invention, for example, FIG.
When passing the flat cable as illustrated in FIG. 4, for example, as illustrated in FIG. 4, the jet port (8) connected to the pipe line (14) and the inlet (6) of the flat cable (13).
And a circular slit (4) and a compressed fluid supply means (5), the flat cable (1
The inlet (6) of 3) is provided with a rectangular opening, and a passage device (16) having an annular groove (15) is arranged between the opening and the Coanda spiral flow generating section. The rectangular cable (13) is routed through the conduit (14).

In this case, the wiring device itself may have various modes such as those shown in FIG. 5 or FIG. In the usual forced transfer method using turbulent flow, the rectangular cable (13) is greatly vibrated vertically or horizontally in the thickness direction, making it impossible to run the wire. Further, the conventional Coanda spiral flow wire illustrated in FIG. Although it is not easy for the device to pass wires, the present invention enables smooth and long-distance running of a rectangular cable with high efficiency. Moreover, even if the pipe line (14) has a bent portion or a water pool, no trouble occurs.

The jet outlet (8), the inlet (6) and the passage (1) in the wire passage device exemplified in FIGS. 4, 5 and 6.
6), the size of the annular groove (15), the angle θ of the inclined surface (9), etc. should be set in consideration of the size and weight of the target rectangular cable (13) and the wire speed. You can For example, the angle θ is about 5 to 70 °, the cross-sectional area of the angular opening of the introduction port (6) is about 20 to 200% of the cross-sectional area of the flat cable, and the lavance is large. The annular groove (15) that suppresses the back flow of the compressed fluid by the effect and facilitates the passage is provided with the passage (1
It is preferable to arrange a plurality along 6).

The pressure of air or the like as the compressed fluid can be set appropriately. Hereinafter, examples will be shown and described in more detail.

[0019]

EXAMPLE A rectangular cable was run using the wire running apparatus of FIGS. 5 and 6. The inclination angle θ in this case was 30 °, and the diameter of the ejection port (8) was 2.5 mm in both cases of the single Coanda spiral flow generation unit in FIG. 5 and the double units in FIG. The angular opening of the inlet (6) is 1.5 × 0.5 (mm), the length of the passage (16) is 23 mm, and the groove (15) is the passage outlet in this passage (16). Within a range of 13 mm,
Four pieces having a diameter of 2.3 mm and a width of 1 mm were arranged.

Using this wire passage device, the flat cable (13) was inserted into the introduction port (6) by a feeding device that sandwiched and fed the flat cable to the opposing roller. Flat cable (1
As 3), 1.2 × 0.
The size is 4 mm (w × t in FIG. 3) and the unit weight is 0.6.
The thing of g / m was used. As a result, as shown in Table 1,
Compressed air pressure 3 to 10 kgf / cm ² , pipe length 100
In any case of up to 400 m, the flat cable was smoothly passed.

[0021]

[Table 1]

[0022]

As described in detail above, according to the present invention, it is possible to smoothly carry a flat cable by fluid transportation, which has been impossible until now.

[Brief description of drawings]

FIG. 1 is a block diagram exemplifying a wiring method and apparatus already proposed by the inventor.

FIG. 2 is a cross-sectional view illustrating a Coanda spiral flow unit that can be used in the method of FIG.

FIG. 3 is a perspective view showing an example of a rectangular cable as an object of the present invention.

FIG. 4 is a sectional view showing an example of a device of the present invention.

FIG. 5 is a cross-sectional view showing another device example of the present invention.

FIG. 6 is a cross-sectional view showing still another device example of the present invention.

[Explanation of symbols]

 1 Pipeline 2 Flexible Hose 3 Coanda Spiral Flow Unit 4 Annular Slit 5 Compressed Fluid Supplying Means 6 Inlet 7 Conductor 8 Jet Outlet 9 Sloping Surface 10 Distribution Chamber 11 Compressed Fluid Supplying Channel 12 Core Wire 13 Flat Cable 14 Pipeline 15 Groove 16 Passage

Claims (3)

[Claims] 1. A Coanda spiral flow generated by the supply of a compressed fluid is used to pass a conductor or an optical fiber rectangular cable introduced from an introduction port through a passage having an annular groove to the generation region in a pipe line. How to run a flat cable. 2. An injection port, an inlet for a rectangular cable of a conductor or an optical fiber, an annular Coanda slit for supplying a compressed fluid for generating a Coanda spiral flow in the direction of the pipe, and a supply path for the compressed fluid. A Coanda spiral flow wire passing device having a rectangular cable having an angular opening at an inlet, and a passage having an annular groove is provided between the angular opening and the Coanda spiral flow generating unit. A wire passing device for rectangular cables. 3. A conduit tube in which a rectangular cable of a conductor wire or an optical fiber is arranged in a conduit line, wherein the rectangular cable is one in which a compressed fluid is inserted.