JP2001241743A - Air leakage prevention structure for air duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To find an air leakage prevention structure for an air duct for suppressing air leakage and a flattering phenomenon in the situation of the prior art in which although in working fields requiring ventilation of air an air fan and a plurality of air ducts connected are employed, when those air ducts are connected to each other the air leakage and the flattering phenomenon happen at a connection portion between the adjacent air ducts upon changeover of air flow directions due to air feed and evacuation, so that renewing of the duct and a double fastener duct are required, and further any damage happens at the connection portion to make long time stable use impossible. SOLUTION: An air leakage prevention structure for an air duct has flexible air ducts connected to each other through a fastener, and a fastener connection portion is covered with an air leakage prevention skirt. Further, a belt comprising a low extension material is mounted at an end of the air leakage prevention skirt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly sealed building or a tunnel construction site that requires ventilation at a work site. Concerning wind pipes used to efficiently supply and remove air when polluted air is released outside the tunnel from fresh water, etc. or when fresh air is supplied into the tunnel, etc., especially air leakage at the connection of wind pipes The present invention relates to a structure for preventing air leakage.

[0002]

2. Description of the Related Art Conventionally, a wind pipe of this type has been required to be a single wind pipe with the extension of tunnel excavation in recent years, and is made of a flame-retardant, light, high-strength fiber called DLYNEMA and PE, which is called FLY. The main part of the fiber is made of a fiber, and a fastener is attached to the end and connected by a chuck structure using the fastener.

[0003] However, in the connection structure using the fastener, airtightness is poor and the internal air leaks from this connection portion as compared with the above-described wind fiber main body portion using the fiber, and especially in an extended tunnel. In that case, the air source had to be required to have a high output, and the economic efficiency continued to deteriorate. Therefore, various measures were taken to prevent the air inside the wind pipe from leaking.

For example, according to the technique disclosed in Japanese Unexamined Utility Model Publication No. 4-65900, one end is fixed to a circumferential surface slightly inside a connecting portion of a wind conduit, and the other end is free to move along the flow direction of air. By providing a fluttering cylindrical air leak prevention device,
Some have stated that the leakage from the connection point of the wind conduit is improved.

According to the technique described in Japanese Patent Application Laid-Open No. Hei 8-271029, a fastener is used for connection, and the outer peripheral portion of the wind duct is covered with a sheet made of a material having high air permeability and flexibility and elasticity. A tool for preventing internal air from leaking due to internal pressure from a connection part by a fastener of the wind duct by gripping at both ends with a reinforcing body made of a material having a non-breathable, flexible, and inextensible strength. It is shown.

[0006]

However, the means for preventing the air from leaking from the connection portion by the fastener of the two wind pipes is provided in a double structure with the wind pipe itself inside and outside the wind pipe. It is determined that there is only a difference between shutting out beforehand or shutting out after the fact.

In this case, in Japanese Utility Model Application Laid-Open No. 4-65900, although it is possible to mount in advance, the flow of air is switched every time the internal air is sent and exhausted, so that a fluttering phenomenon occurs. In addition, there is a possibility that damage due to fatigue may occur due to long-term use.

[0008] In the case of Japanese Patent Application Laid-Open No. Hei 8-271029, the troublesome work of having to attach each one later is inevitably added.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air duct leakage prevention structure which can be installed in advance and saves the trouble of mounting each one, and is provided with means for preventing the occurrence of a fluttering phenomenon in air supply and exhaust.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an air leakage prevention skirt which covers an outer peripheral surface near an end of one flexible wind conduit body and extends forward. A male fastener piece is provided on the inner peripheral surface of the wind leakage prevention skirt so as to be located in front of the end of the wind conduit body, and a female fastener piece is provided on the outer peripheral surface of the end of the other wind conduit body. A belt made of a low elongation material is attached to the surface.

The belt made of a low elongation material can be a belt made of chemical fiber, and the inner diameter of the air leakage prevention skirt is set to be larger than the outer diameter of the wind duct main body.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an embodiment of a structure for preventing air leakage in a wind duct according to the present invention.

[0013]Example  FIG. 1 is a sectional view of a side surface of a wind conduit according to an embodiment of the present invention.
is there. One flexible wind conduit body 10 near the end near the end
An anti-leak skirt 16 covering the peripheral surface and extending forward near the end
It is provided on the side 14 by sewing, heat bonding, adhesive or the like. Leak prevention
It is located on the inner peripheral surface of the skirt 16 in front of the end of the wind conduit body.
A male fastener piece 12 is provided. Anti-leak skirt 16
The inner diameter is slightly larger than the outer diameter of the other wind conduit body 22
Is set to On the inner peripheral surface 18 at the end of the leakage prevention skirt 16
Is provided with a belt 20 made of a low elongation material. Also,
A female fastener piece 24 is sewn on the outer peripheral surface of the end of the other wind conduit body 22.
It is provided by the product. Note that the male fastener piece 24
Fastener slider for connecting a fastener piece and a female fastener piece
A tag 26 is provided. In addition, fasteners
Locking string 28 is provided. In addition, the wind conduit bodies 10, 22
Is provided with a plurality of suspension rings 30 and suspension bands 32. This
These are designed to suspend a wind pipe in a tunnel or the like.
The purpose is to prevent it from disturbing the work.
This prevents direct exposure to forces such as rubbing and impact.

FIG. 2 is a side sectional view of the wind conduit showing a schematic configuration before connecting the wind conduit main body 10 and the wind conduit main body 22. FIG. 3 is a cross-sectional view of a side surface of the wind conduit schematically illustrating preparation for connection of the wind conduit. That is, the air leakage prevention skirt 16 is inverted in advance and retracted in the direction of the air duct main body 10 so that the male fastener pieces 12 can be connected. On the other hand, the wind conduit body 22 is brought close to the female fastener piece 24 using the fastener slider ring 26.
And the male fastener piece 12 is connected. Next, the anti-leak skirt 16 is advanced and inverted to complete the connection. FIG. 4 is a cross-sectional view of a side surface of the wind conduit schematically showing a state in which the wind conduit main body 10 and the wind conduit main body 22 are connected. That is, when air flows in the wind conduit, the wind conduit 22 expands due to the internal pressure of the flowing air in any of the flowing directions of the air 34 and 36, and the air conduit 22 is in close contact with the leak prevention skirt 16 and is in contact with the wind conduit 22. Hermeticity is maintained with the connection vicinity portion 38, and as a result, air leakage at the connection portion is prevented. Further, the expansion of the air duct is suppressed by the low elongation belt 20, and the fluttering phenomenon due to the wind-up of the leakage prevention skirt and the like is also avoided.

[0015]Comparative Example 1  FIG. 5 is a side sectional view of a conventional wind conduit. Flexible
A female fastener 42 is provided on the outer peripheral surface of a certain wind conduit body 40
I have. In the vicinity of the tip, a leakage prevention skirt 44 is formed.
ing. A suspension ring 30 and a suspension band 32 are provided as in FIG.
Have been. On the other hand, the male pipe is located near the tip of the wind conduit body 46.
Fastener 48 is installed. Wind conduit body 40 and wind conduit book
Put the body 46 in advance,
After inserting the female fasteners into the
It is connected by fixing the snare 48. Wind conduit connected
When the air flows in a state (not shown),
When the flow direction is 50, the air leakage pressure
The plate 44 is pressed against the inner surface of the air guide tube body 46 to maintain the airtightness
Leakage of air is prevented. However, the flow of air
If the direction is 52 in the opposite direction, the tip of the leakage prevention skirt 44
Air leakage from the part is easy to occur and the skirt
Fluttering (fluttering phenomenon)
Damage to the skirt.

[0016]

According to the present invention, a flexible wind conduit is connected with a fastener piece, the fastener connection portion is covered with a leakage prevention skirt, and a belt made of a low elongation material is attached to an end of the leakage prevention skirt. The leak prevention structure of the attached wind conduit prevents air leakage and fluttering at the connection of the wind conduit even when switching the air flow direction due to air supply / exhaust. In addition, there is no need for a double fastener wind conduit, and there is little damage to the connection, so that long-term stable use is possible.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a wind duct according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the wind conduit showing a schematic configuration before connecting the wind conduit main body 10 and the wind conduit main body 22 shown in FIG.

3 is a cross-sectional view of a side surface of the wind conduit schematically illustrating preparation for connection of the wind conduit illustrated in FIG. 1;

FIG. 4 is a side sectional view of the wind conduit schematically showing a state where the wind conduit main body 10 and the wind conduit main body 22 shown in FIG. 1 are connected.

FIG. 5 is a side sectional view of a conventional wind conduit.

[Explanation of symbols]

 10 Wind conduit body 12 Male fastener piece 14 Outer peripheral surface near the end 16 Leak prevention skirt 18 Inner peripheral surface of end of leak prevention skirt 20 Belt made of low elongation material 22 Wind conduit body 24 Female fastener piece 26 Fastener slider ring 28 Fastener slider ring fixing cord 30 Suspension ring 32 Suspension band 34 Air flow direction 36 Air flow direction 38 Near connection 40 Wind conduit body 42 Female fastener 44 Leak prevention skirt 46 Wind conduit body 48 Male fastener 50 Air flow direction 52 Air Flow direction

Claims (3)

[Claims] 1. An air leakage prevention skirt covering an outer peripheral surface and extending forward is provided near an end of one flexible wind conduit main body, and an end of the wind conduit main body is provided on an inner peripheral surface of the air leakage prevention skirt. A male fastener piece is provided so as to be located in front, a female fastener piece is provided on the outer peripheral surface of the end of the other air duct main body, and a belt made of a low elongation material is attached to the peripheral surface of the tip of the leakage prevention skirt. Leakage prevention structure of wind conduit characterized by the following. 2. The structure according to claim 1, wherein the belt made of a low elongation material is a belt made of chemical fiber. 3. The structure according to claim 1, wherein the inner diameter of the skirt is set larger than the outer diameter of the main body of the air duct.