JP3310724B2 - Spiral hose manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a fire-extinguishing helical hose which is installed and stored, for example, wound on a reel, and which is pulled out by a required length when used.

[0002]

2. Description of the Related Art In fire hydrants installed in buildings and the like,
A shape-retaining hose that is lightweight, flexible, and kept circular without being easily crushed even when an external force is applied is spirally wound around a reel. A base end of the hose is connected to a fire hydrant via a connection base, and a water discharge base is provided at a front end.

[0003] Therefore, when extinguishing a fire, by holding the tip of the hose and pulling it out, the reel can be rotated and the hose can be pulled out by a necessary length. When the hose is pulled out halfway, the base end of the hose is connected to the reel. Although it is still wound, it can pass water because it is a circular shape-retaining hose.

As this type of hose, a jacket hose in which a rubber or synthetic resin lining layer is provided on the inner surface of a jacket in which fibers are woven in a tubular shape. That is, a warp yarn made of fiber and a weft yarn made of a metal linear body or a synthetic resin linear body are woven in a tubular shape, and a rubber or synthetic resin lining layer is provided inside the jacket.

That is, the conventional hose is configured as shown in FIG. The jacket 12 of the hose 11 is
The warp 13 uses 440 yarns (20 / 6S) obtained by burning a plurality of polyester spun yarns, and the weft 14 is a polyester monofilament yarn (φ1.6 mm).
It is woven into a tubular shape by driving at a rate of about 20 between 10 cm. A lining layer 15 of polyester-based TPE is applied to the inner surface of the jacket 12 to have an inner diameter of 38 mm.

The interval between the weft threads 14 of the jacket 12 is (100 mm / 20 peaks) -1.6 mm = 3.
4 mm, which is 2.1 times the diameter of the weft yarn 14.

In this hose 11, since the density of the weft yarn 14 is low, even if the hose 11 is bent, the weft yarn 1 is formed inside the bend.
4 and the weft thread 14 do not interfere with each other and there is room for approach, and no wrinkles occur.

Since the density of the weft yarn 14 is low (usually twice or more the diameter of the weft yarn), there is a problem that the inner surface of the hose 11 has large irregularities and a large pressure loss. In order to solve this problem, a hose has been developed in which the pressure loss is reduced by reducing the unevenness of the inner surface as shown in JP-A-1-43877.

That is, as shown in FIG. 4A, a lining layer 15 reinforced with a flexible fiber tubular cloth is provided on the inner surface of a jacket 12 comprising a warp yarn 13 and a weft yarn 14.
Is adhered so as to be bonded only to the tops of the protrusions in the irregularities on the inner surface of the tubular fabric and the jacket 12 to reduce the irregularities on the inner surface.

[0010] That is, the jacket is the same as before,
The lining layer on the inner surface closes the unevenness of the inner surface of the jacket, especially the opening of the concave portion, thereby forming a flat state and reducing the pressure loss.

[0011]

However, when the internal pressure of the hose 11 shown in FIG.
5 is pushed into the concave portion at the intersection of the warp yarn 13 and the weft yarn 14, and the unevenness on the inner surface of the hose 11 is raised, causing a problem that the pressure loss increases and the effect is reduced.

FIG. 4 shows a state in which the hose 11 is stretched and the inner surface 16 of the hose is flat as shown in FIG. As shown in FIG. 2B, in a state where the hose 11 is wound around a reel or the like, the inside 17 of the winding is compressed, and a wrinkle 18 having large unevenness is generated, and the wrinkle 18 causes a large pressure loss.

Furthermore, when the hose 11 is stretched and used under pressure, as shown in FIG.
As shown in FIG. 3D, when pressure is used in a state where 1 is wound on a reel or the like, a wrinkle 18 having large irregularities is generated on the inner side 17 of the hose inner surface 16, and the wrinkle 18 causes a pressure loss. growing.

Further, as shown in FIG. 5, if only the weft yarn 14 is made thinner and the space between the weft yarns 14 is reduced to make the weft yarns 14 denser, the same will occur if the hose 11 is stretched. As shown in FIG. 5A, the inner surface 16 of the hose is flat, but as shown in FIG.
Are compressed to generate wrinkles 18 having large irregularities, and the wrinkles 18 increase the pressure loss.

The present invention has been made in view of the above circumstances, and has as its object to reduce pressure loss in a rolled state which is not only excellent in light weight and flexibility but also worse than in a stretched state. An object of the present invention is to provide a method of manufacturing a spiral hose which can be made small and has low water flow resistance even in a straight state or a wound state.

[0016]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a warp made of heat-shrinkable fiber and a weft containing a metal linear body or a synthetic resin linear body. Inside the woven jacket, a tube made of rubber or thermoplastic elastomer is inserted to form a hose main body, and then both ends of the hose main body are sealed, and the inside of the hose main body is pressurized and spirally wound. Heat the hose main body while holding it in the turned state, glue the tube to the inner surface of the jacket and mold it into a spiral shape
When the main body of the hose is stretched straight,
To make a slight wrinkle or wave on the outside
A method for manufacturing a spiral hose, which is a feature of the present invention.

[0017]

When the main body of the hose is held in a spirally wound state, the warp outside the winding is tensioned, the tube is elongated, and the warp and the tube inside the winding are compressed. In this state, the internal pressure is reduced. When heated while being added, the warp yarn is also thermally shrunk to become a flat inner surface without wrinkles, a pressure loss is small, and a helical hose having a small water flow resistance even in a straight or wound state can be manufactured.

[0018]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the jacket 12 of the hose 11 uses 440 warp yarns (20 / 6S) obtained by burning a plurality of polyester spun yarns, and weft yarns 14 use a polyester monofilament yarn (φ1.4 m).
m) at a rate of about 27 between 10 cm,
It is woven in a tubular shape.

Reference numeral 15 denotes a tube bonded to the inner surface of the jacket 12, which is formed into a cylindrical shape with rubber or a thermoplastic elastomer, and has an adhesive layer 16 on its outer surface.
And is integrally bonded to each other with an inner diameter of 38 mm.

The interval between the weft threads 14 of the jacket 12 is (100 mm / 27 peaks) -1.4 mm = 2.
30 mm, which is 1.6 times the diameter of the weft thread 14 and makes the weft thread 14 denser than twice the maximum diameter of the weft thread 14 used.

Here, the interval between the weft yarns 14 is the gap between the adjacent weft yarns 14, and the maximum diameter of the weft yarns 14 is two types of weft yarns having different sizes. This is the diameter of the thicker weft thread 14. When the cross-sectional shape of the weft thread 14 is elliptical, it is a dimension in the longitudinal direction.

If the jacket 12 thus woven is also provided with a lining layer by a conventional method to form a hose, the same problem as in the example of FIG. 5 occurs when wound.
This is probably because the yarn of the jacket is restrained by the adhesive of the lining material and cannot be freely deformed.

However, in the state of the jacket 12 before the lining layer is applied, since there is a great degree of freedom, even if it is spirally wound, uneven wrinkles as shown in FIG. 5 do not occur. Next, the manufacturing method of the present invention focusing on these points will be described.

First, the jacket 12 is formed by weaving the warp yarn 13 and the weft yarn 14 in a tubular shape. On the other hand, the tube 15 is formed by molding into a tubular shape with rubber or a thermoplastic elastomer, and an adhesive layer 20 is applied to the outer surface of the tube 15.

The tube 15 is drawn into the inside of the jacket 12 to form a hose main body 21 having a double structure composed of the jacket 12 and the tube 15.
1 are sealed by sealing metal fittings (not shown).

Next, when the hose main body 21 is spirally wound around a mandrel or the like, and steam is supplied to the inside of the hose main body 21 and heated while being pressurized, the tube 15 is in a softened state and expanded by the pressurization. Jacket 12
Adhered to the inner surface of the An adhesive layer 2 is provided on the outer surface of the tube 15.
0, the tube 1
5 is integrally adhered to the inner surface of the jacket 12.

That is, when the jacket 12 in which the tube 15 is inserted is spirally wound around a mandrel or the like, the warp yarns 13 on the winding inner side 17 are compressed, and the warp yarns 13 on the winding outer side 19 are tensioned. The inner 15 of winding 15 is compressed and the outer 19 of winding is expanded.
In this state, when heating is performed while applying pressure, the warp yarns 13 are thermally shrunk on the winding inner side 17 and adhere to the tube 15 in a bulky state. On the outside 19 of the winding, the warp yarn 13 is tensioned and the tube 15 is stretched, and both are adhered and fixed.

As shown in FIG. 2, the obtained spiral hose can be wound on a reel or the like in a spiral manner,
7. There is no wrinkle on the winding outer side 19 and a flat state is obtained. As a result, it is possible to provide a helical hose having a smaller pressure loss than a conventional hose even in a wound state having a large pressure loss.

When this spiral hose is stretched linearly, the winding inner side 17 is elongated and the winding outer side 19 is compressed, so that a slight wrinkle or a wave is generated on the winding outer side 19. However, since the pressure loss of a straight hose is smaller than that of a wound hose, the effects of wrinkles and waves are offset, the pressure loss is negligibly small, and there is little water flow resistance even in a straight or wound hose A spiral hose is obtained.

The spiral hose constructed as described above is formed by applying a lining layer to the inner surface of the jacket 12 with a tube 15 of a thermoplastic elastomer in a state where the jacket 12 is spirally wound. Therefore, the hose has a spiral-shaped bending habit. Therefore, when the spiral hose wound spirally around the fire hydrant is pulled out and used, the contact area between the hose and the floor surface is reduced, the hose pull-out resistance is small, and the hose can be pulled out with a small amount of force. In addition, there is an effect that the resistance when winding and storing the hose on the reel after use is small.

In the above embodiment, the adhesive layer 20 is provided on the outer surface of the tube 15. However, if a tube having an adhesive property is used, the adhesive layer 20 is not necessarily provided.

[0032]

As described above, according to the present invention, a tube is inserted into a jacket to form a main body of a hose, and both ends of the main body of a hose are sealed to pressurize the inside of the main body of the hose. By heating and forming the main body of the hose while maintaining the spirally wound state, a flexible and lightweight spiral hose can be easily manufactured.

The obtained spiral hose can reduce the pressure loss in the wound state, which is worse than the expanded state of the hose, and can provide a spiral hose having a small water flow resistance even in a straight state or in a wound state. .

Further, since the hose has a helical bending habit, the contact area between the hose and the floor surface is reduced when the spiral hose wound spirally on the reel is used. The hose has a low withdrawal resistance, can be pulled out with a small amount of force, and has a small resistance when the hose is wound up and stored on a reel after use, so that the handleability is excellent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a part of a spiral hose showing one embodiment of the present invention.

FIG. 2 is a longitudinal side view of the spiral hose of the embodiment in a wound state and in an expanded state.

FIG. 3 is a longitudinal sectional side view of a conventional jacket hose in a stretched state and a wound state.

FIG. 4 is a longitudinal sectional side view of another conventional jacket hose in an expanded state and a wound state.

FIG. 5 is a longitudinal sectional side view of another conventional jacket hose in an expanded state and a wound state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Hose 12 ... Jacket 13 ... Warp 14 ... Weft 15 ... Tube 20 ... Adhesive layer 21 ... Hose main body

Claims (1)

(57) [Claims] 1. A tube made of rubber or thermoplastic elastomer is inserted into a jacket in which a warp made of heat-shrinkable fiber and a weft containing a metal linear body or a synthetic resin linear body are woven in a cylindrical shape. Then, both ends of the hose main body are sealed, the inside of the hose main body is pressurized, and the hose main body is heated while being held in a spirally wound state, and the tube is heated. Glued to the inner surface of the jacket and formed into a spiral shape, the hose
When the main body is stretched in a straight line, there is little outside the winding
A method for manufacturing a helical hose, wherein waves or waves are generated .