JPH0438186Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a ventilation duct housing tube, and particularly to a ventilation duct housing tube suitable for housing a ventilation duct that ventilates from the ground into a manhole through a manhole folding screen.

[Conventional technology]

When working inside a manhole, a ventilation fan is used to blow fresh air into the manhole to prevent oxygen deficiency inside the manhole. This ventilation system consists of a ventilation fan and a ventilation duct connected to the fan, and the tip of the ventilation duct is introduced into the manhole. The ventilation duct is a so-called spiral duct, in which a spiral core is inserted into a flexible cylindrical cloth made of synthetic resin or the like, from the viewpoint of ensuring elasticity and ensuring a ventilation path.

In this type of ventilation system, a manhole folding screen surrounds the above-ground manhole opening for work inside the manhole, and the spiral duct is passed through a hole for a ventilation fan formed in the folding screen to install a duct inside the manhole. It is set up to guide you. The ventilation fan is placed outside the manhole folding screen so that there is no obstruction to access to and from the manhole.

[The problem that the idea aims to solve]

However, in conventional ventilation systems, the spiral core of the duct has a springy property that tends to expand when it is not in use, which poses a problem in storing the spiral duct, so it is usually compressed and placed in a storage bag with a zipper. Therefore, there was a problem that the handling was extremely complicated. In addition, even when in use, the duct length is longer than the actually required length, and if there is a lot of free play due to the size and shape of the manhole, there is the problem of ventilation problems such as duct collapse. It was hot too. In addition, at the work site, a ventilation fan is placed on the ground, and a spiral duct connected to this ventilation fan is extended and passed through a hole for the ventilation fan that is opened at a certain height on the manhole screen. It is installed to lead inside the manhole. For this reason, the spiral duct was raised to the level of the ventilation fan hole at the manhole folding screen, which caused the ventilation path to bend and create a large ventilation resistance. For this reason, there was a problem in that a ventilation fan that was larger than necessary had to be used from a safety standpoint in order to ensure the amount of air being blown.

The present invention focuses on the above-mentioned conventional problems, and has a structure that makes it extremely easy to handle the spiral duct, allows easy adjustment of the duct length, and easy storage operation, without bending the ventilation path. An object of the present invention is to provide a ventilation duct housing tube that can be attached to a manhole folding screen.

[Means to solve the problem]

In order to achieve the above object, the ventilation duct housing cylinder according to the present invention is a ventilation duct housing cylinder that houses a spiral duct connected to a ventilation fan.
A long hole for manual insertion is formed in the side wall of the cylinder body along the direction of the cylinder axis, and a stopper hole is formed along the cylinder circumferential direction to allow attachment of a rod placed transversely within the cylinder to position the spiral duct. It is something.

[Effect]

According to the above configuration, the ventilation fan's air outlet is attached to one end of the ventilation duct housing tube, and the spiral duct connected to the ventilation fan is passed through the inside of the ventilation duct housing tube. Therefore, the spiral duct is led out from the opening at the tip of the ventilation duct housing tube. When the spiral duct is not in use, the duct is retracted, and this can be done by pulling the spiral duct into the ventilation duct housing cylinder through the manual insertion elongated hole in the ventilation duct housing cylinder. To pull in the duct, hold the duct at the tip of the manual elongated hole, pull it in to the rear end of the elongated hole, and repeat this process. At this time, the ventilation duct accommodating cylinder serves as a guide for the spiral duct, and can be accommodated without causing so-called disintegration. Then, by retracting the terminal end beyond the stopper hole and engaging the rod-shaped stopper with the stopper hole, the tip of the spiral duct is stopped by the stopper and housed without jumping out of the ventilation duct housing tube. In addition, by placing this ventilation duct housing cylinder on a suitable stand, setting it at the height of the hole for the ventilation fan in the manhole folding screen, and inserting the tip of the ventilation duct housing cylinder into the hole for the ventilation fan, the spiral duct can be created. It can be introduced into a manhole without bending. This allows ventilation to be carried out by reducing air blow resistance, thereby making it possible to downsize the ventilation fan. Furthermore, the length of the spiral duct can be freely adjusted because the engagement position by the stopper can be determined appropriately, and play in the duct can be eliminated to ensure safety.

〔Example〕

Hereinafter, specific embodiments of the ventilation duct housing cylinder according to the present invention will be described in detail with reference to the drawings.

1 and 2 show the usage state of the ventilation duct housing tube according to the embodiment, FIGS. 3 to 6 show the ventilation duct housing tube alone, and FIG. 7 shows the stopper.

As shown in the figure, the ventilation duct housing tube according to the embodiment is composed of a cylindrical tube body 10 made of vinyl chloride or the like, and both ends are open.
The opening at one end of the cylinder body 10 is the installation side of the ventilation fan 12, so that the ventilation fan 12 can be inserted into the cylinder body 10 and integrated. The connection between the cylinder body 10 and the ventilation fan 12 may be performed using an appropriate fixture. Cylinder body 1
A fitting groove 18 with a flange 16 provided at the end of the spiral duct 14 is formed on the side where the ventilation fan 12 is attached to prevent the cylinder body 10 and the spiral duct 14 from falling off. The spiral duct 14 has a spiral ring 20 as a core material wrapped around a thin cloth material 22 made of synthetic resin or the like.
It is connected to the tube body 10 so that it can be led out from the opening at the other end through the inside of the tube body 10.

Here, a pair of elongated holes 24 for manual insertion along the direction of the cylinder axis are formed in the side wall of the cylinder body 10. Hold the cylinder body 10 and insert your hands through the elongated holes 24 for manual insertion on both sides to insert the spiral ring 20. The spiral duct 14 can be housed by grasping it and pulling it toward the ventilation fan 12. Further, a stopper hole 26 is formed in the upper surface of the cylinder main body 10 on the distal side of the position where the manual insertion elongated hole 24 is formed along the circumferential direction so as to be orthogonal to the cylinder axis direction. This stopper hole 26 is a thin hole 26 along the circumferential direction of the cylinder body 10, as shown in FIG.
A and a stopper attachment/detachment hole 2 with a wide middle part
6B, and the opening is formed in a T-shape as a whole. This stopper hole 26 is adapted to be fitted with a stopper 28 that locks the tip of the spiral duct 14 while the spiral duct 14 is housed therein.

As shown in FIG. 7, the stopper 28 is a cylindrical pipe 2 having a diameter equivalent to the width of the narrow hole 26A.
8A and a rubber ring 28B penetrated through this cylindrical pipe 28A.
is wound around the outer periphery of the cylinder body 10 to form a cylindrical pipe 28A.
By fitting into the stopper hole 26, the spiral duct 14 is prevented from popping out. That is, the cylindrical pipe 28A of the stopper 28
When the cylindrical pipe 2 is fitted into the thin hole 26A, the cylindrical pipe 2
8A crosses the inside of the cylinder body 10 in the chordal direction, locks the spiral ring 20 having a diameter corresponding to the inner diameter of the cylinder body 10, and supports the elastic biasing force. When the stopper 28 is to be removed, it is sufficient to insert a hand into the stopper attachment/removal hole 26B, grasp the cylindrical pipe 28A, and pull it up to remove it from the stopper hole 26. In addition, the stopper hole 26
A screw hole 30 for locking the stopper 28 is formed on the side of the pipe, and a presser plate (not shown) is screwed into the hole to prevent the cylindrical pipe 28A from falling off.

Furthermore, a hook 32 for winding the cord of the ventilation fan 12 is attached to the cylinder body 10, so that the cord can be wound and held when the ventilation fan 12 is attached. Further, as shown in FIGS. 1 and 2, a support stand 34 is attached to the ventilation duct housing tube, and is placed at the height of the ventilation opening 38 formed in the manhole folding screen 36. The heights of the ventilation duct housing tubes can be matched. This support stand 34 may be fixedly provided on the cylinder body 10, or the legs may be foldable. Further, in order to fit the ventilation opening 38 of the manhole folding screen 36, a height adjustment stand 40 is attached to the lower surface of the tube body 10, so that adjustment can be easily performed on site. Further, a handle 42 is formed on the upper surface of the cylinder body 10 so that the ventilation duct housing cylinder can be held and moved by hand. This is as shown in Fig. 3.
A pair of holes 44 parallel to 0 are bored, and a bridge formed between the holes 44 is used as the handle 42.

The effect of the ventilation duct housing tube according to such a configuration is as follows. When the spiral duct 14 is not in use, it is stored in the cylinder body 10 in advance, but this is done by fixing the flange 16 of the spiral duct 14 to the end of the cylinder body 10, and pulling it in using the elongated hole 24 for manual insertion. It is held in the built-in state by the stopper 28. In use, the ventilation fan 12 is attached and fixed to the cylinder body 10 from the flange 16 side. In this state, the handle 42 is held and placed on the support stand 34, and the tip of the cylinder body 10 is partially inserted into the ventilation opening 38 of the manhole folding screen 36. Then, the stopper 28 is removed, the spiral duct 14 is pulled out from the opening at the tip of the cylinder body 10, and the manhole 44 surrounded by the manhole screen 36 is opened.
What is necessary is just to introduce the said spiral duct 14 inside. When the ventilation fan 12 is driven in this state, the cylinder body 10 is aligned with the height of the ventilation port 38 by the support base 34, so that the spiral duct 14 does not have an unreasonable bend and there is no ventilation resistance. Air can be blown to the manhole 46. In this case,
When the tip position of the spiral duct 14 reaches a predetermined position, the stopper 28 is engaged with the stopper hole 26, and the extension of the spiral duct 14 is stopped at the required length to adjust the length.

After completing the work, use the elongated manual holes 24 on both sides of the cylinder body 10 to pull the spiral ring 20 of the spiral duct 14 into the cylinder body 10 as shown in FIG. 2. The spiral duct 14 is accommodated in a contracted state.
After one end of the spiral duct 14 is retracted from the stopper hole 26, the cylindrical pipe 28A of the stopper 28 is fitted into the narrow hole 26A of the stopper hole 26, and when the spiral duct 14 is released, the spiral ring 20 is expanded by the action. I try, but
The cylindrical pipe 28A locks the spiral ring 20 and prevents further expansion, resulting in a stored state.
From this state, the fan 12 can be removed from the support stand 34, and the ventilation fan 12 can be removed and placed in a storage location. In this case, the spiral duct 14 is completely housed within the ventilation duct housing cylinder and is held inside by the action of the flange 16 and the stopper 28. When not in use for a long period of time, the holding plate of the stopper 28 may be fixed to the cylinder body 10 to prevent the stopper 28 from falling off.

As described above, according to this embodiment, the spiral duct 14 can be taken in and out very easily, and the height of the spiral duct 14 is prevented from being bent by matching the height of the ventilation opening 38 of the manhole folding screen 36. Since the generation of ventilation resistance due to sagging can be suppressed, safety is high and the workability of installing the ventilation system is very good. More specifically, a spiral duct 14 with a length of 5 to 6 m can be accommodated without damage, and the duct length can be easily adjusted to the required length during use. Furthermore, the support stand 3
4 allows it to be installed above the height of the manhole waterproof frame, reducing the number of bends in the duct, and
The suction of dust from the road surface by the ventilation fan 12 is reduced, and good ventilation can be achieved. When transported, it can be loaded into a vehicle in an upright position, which has the advantage of requiring less space.

[Effect of idea]

As explained above, according to the present invention, the spiral duct can be housed in a protected state, and when in use, it can be easily taken in and taken out, the length of the duct can be adjusted, and it can be introduced into a manhole without bending. , the effect that safe ventilation can be achieved can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the ventilation duct storage tube according to the embodiment in use, and FIG. 2 is a cross-sectional view of the duct storage tube.
Figure 3 is a top perspective view of the ventilation duct housing cylinder;
5 is a perspective view of the right side, FIG. 6 is a perspective view of the left side, and FIG. 7 is a front view of the stopper. 10...Cylinder body, 12...Ventilation fan, 14...
...Spiral duct, 24...Elongated hole for manual insertion, 2
6...stopper hole, 28...stopper, 34...
Support stand, 36...manhole folding screen, 38...ventilation opening, 42...handle, 44...manhole.

Claims (1)

[Scope of utility model registration request] A ventilation duct housing cylinder that accommodates a spiral duct connected to a ventilation fan is formed with a long hole for manual insertion along the cylinder axis direction in the side wall of the cylinder body, and is placed transversely within the cylinder to position the spiral duct. A ventilation duct accommodating cylinder characterized by forming a stopper hole along the circumferential direction of the cylinder so that a rod can be attached.