JPH0415835Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a variable diameter restrictor tube for a flexible wind pipe for ventilation.

Flexible wind pipes used for ventilation in tunnel construction, mines, etc. become unable to maintain their circular cross-sectional shape due to internal pressure if the internal pressure drops drastically depending on the capacity of the blower or the air supply distance. Therefore, in order to enable ventilation without replacing the blower with a high-pressure, high-capacity one, a hollow truncated conical throttle tube is connected to the discharge side of the flexible wind pipe, thereby increasing the internal pressure. be.

Conventional throttle tubes like the ones mentioned above have a fixed amount of restriction for ventilation, so it is necessary to install a blower with excessive capacity or prepare several types of throttle tubes depending on changes in the air supply distance, etc. So I went to do the necessary ventilation. According to the former method, the power used is wasted, and according to the latter method, not only does it take time and effort to manage the restrictor tube, but also the work to replace it is quite troublesome.

The variable diameter throttle tube of this invention was proposed in order to solve all the problems mentioned above.In the throttle tube attached to the discharge side of the flexible air tube, the throttle tube body is cylindrical or hollow truncated conical. The tube is made of a highly airtight and highly flexible cloth-like material, and the tube body is closed with a fastener provided on the tube body along two straight lines forming a certain angle from the proximal end to the distal end. , is characterized in that the diameter can be changed by forming pleats.

This invention will be explained below based on embodiments shown in the drawings.

In FIG. 1, reference numeral 1 denotes a flexible wind pipe, and a main body 2 of the throttle pipe of the present invention is attached to its discharge side 1a. A ring joint, a flange joint,
Connections may be made by fastener fittings or other known fittings. Moreover, it goes without saying that another intermediate connecting pipe may be interposed between both 1a and 2b.

The aforesaid throttle tube main body 2 is formed into a cylindrical shape or a hollow truncated cone shape from a cloth-like material that is highly airtight and flexible, and a coupling ring is fixed to the base end side 2b as described above. Sometimes I do. As the cloth-like material, cloth coated with synthetic resin, soft synthetic resin cloth, etc. are used.

As clearly shown in FIGS. 2 and 3, on the back side of the throttle tube main body 2, there are 2 parts from the base end 2b to the distal end 2
Sewing the pair of joining pieces 3a and 3b of the fastener 3 (slide chuck) almost linearly along two straight lines l and m that form a certain angle θ toward a,
Attach by any means such as gluing. 3c is a slider slidably inserted into the pair of joint pieces 3a and 3b, and 3d is a tension piece attached to the slider 3c.

In the example shown in FIG. 2, when you put your hand inward from the tip side 2a of the throttle tube main body 2 and pull the slider 3c toward you (toward the tip side 2a) with the tension piece 2d, as shown in FIG. , the pair of joint pieces 3a and 3b of the fastener 4 are closed by meshing with each other so as to form a straight line. As a result of this action, the triangular portion 20 of the throttle tube body 2 surrounded by the straight lines l and m and having an apex angle of θ is folded outward around the center line n that roughly bisects the apex angle θ. It appears as folds 21. Reference numerals 4 and 5 indicate pairs of pleat stopper fasteners provided on the outer surface or inner surface (in the illustrated example, the outer surface) of the throttle tube main body 2, and by engaging each pair, the folded folds 21 are prevented from hanging out. It is removably fixed to the outer or inner surface of the throttle tube main body 2. Although the crimping fixing devices 4 and 5 in the illustrated example are Velcro tapes, fixing means such as hooks may be provided instead. Note that the crimping fixing device does not necessarily have to be provided because it has little effect on the air throttling function.

The above-mentioned aperture structure, as clearly shown in Figure 1,
It is common to provide multiple locations in the throttle tube body 2.
That is, in the illustrated example, they are provided at two locations symmetrically with respect to the ventilation center line of the throttle tube main body 2,
By closing the two fasteners 3, the diameter of the discharge side can be changed from _D1 to _D2 . Further, by closing only one fastener 3, another diameter can be obtained.
After closing an arbitrary number of fasteners 3, if ventilation is performed through the flexible wind pipe 1, the airtight and flexible throttle pipe main body 2 will swell due to the internal pressure and form a hollow truncated cone shape to release pressurized air. This is the place where it is discharged.

In the present invention, the aperture structure can be provided at N locations (N is a positive integer), and the number of apertures obtained is N+1. In the illustrated example, since the initial shape of the throttle tube main body 2 is cylindrical, there are three possible diameters, including the case where the throttle amount is 0.

In the illustrated example, the fastener 3 is provided on the back side of the throttle tube body 2, but this fastener may also be provided on the front side of the throttle tube body 2. In that case, folds 21 are formed on the inside. The folds formed on the inside are pressed by internal pressure so that they come into close contact with the inner wall of the throttle tube body 2, so
There is little in the way of air flow.

According to the variable diameter restrictor tube of this invention described above, by opening and closing the fastener 3, a plurality of aperture restriction amounts can be obtained with one restrictor tube.
It is not only effective to save energy by eliminating the need to install a blower with excessive capacity to maintain the correct circular cross section of the flexible wind pipe 1 passing through it, but also to prepare a separate throttle pipe for replacement. It is possible to eliminate the troublesome replacement work and maintain proper ventilation, which has the effect of being extremely easy to perform.

[Brief explanation of the drawing]

Figure 1 is a side view showing the outline of the variable diameter restrictor of this invention connected to a flexible wind pipe, Figure 2 is an enlarged side view of the restrictor of the invention with the fastener open, and Figure 3 is the fastener. FIG. 3 is an enlarged side view of the throttle tube of the present invention in a closed state; DESCRIPTION OF SYMBOLS 1...Flexible wind pipe, 1a...Discharge side, 2...Aperture tube main body, 2a...Distal end side, 2b...Proximal end side, 3...
...Fasuna, 21...Fold, θ...Angle, l, m
...straight line.

Claims (1)

[Scope of utility model registration request] In the throttle tube attached to the discharge side 1a of the flexible air pipe 1, the throttle tube main body 2 is formed of a fabric material having a cylindrical or hollow truncated cone shape and is highly airtight and flexible. It is closed with a fastener 3 provided on the throttle tube main body 2 along two straight lines l and m forming a certain angle θ from the side 2b to the tip side 2a, and the pleats 21
A variable diameter throttle tube characterized in that the diameter can be changed by forming a.