JPH1078191A - High-pressure fluid transferring piping, high-pressure fluid transferring piping connector, and high-pressure fluid transferring piping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely transfer a high-pressure fluid over a long period by forming a protecting sleeve for covering the circumference of a resin-made flexible pipe by cylindrically braiding a fiber excellent in sputtering resistance and mechanical strength. SOLUTION: In a high-pressure fluid transferring piping formed of a resin- made flexible pipe 1 and a protecting sleeve 2 put over the circumference thereof, the protecting sleeve 2 is formed by cylindrical braiding a fiber excellent in sputtering resistance and mechanical strength. The protecting sleeve 2 is formed by cylindrically braiding an aromatic polyamide fiber having a thickness of 100 deniers-2000 deniers. The resin-made flexible pipe 1 and the protection sleeve 2 put over the circumference thereof are collectively twisted into a part (ring member) 3 having a spiral groove 3a substantially fitted to the outer form of the resin-made flexible pipe 1, and the part 3 is housed in a facing part 4 having a connecting part 4a to the other piping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure fluid transfer pipe using a resin-made flexible pipe, a high-pressure fluid transfer pipe connector, and a high-pressure fluid transfer pipe apparatus.

[0002]

2. Description of the Related Art As a pipe used for transferring a high-pressure fluid, for example, a pipe connecting a sprinkler head of a fire extinguisher sprinkler installed behind a ceiling of various buildings and a water supply pipe is known. . This pipe is commonly called an unwinding pipe, and has a configuration in which, for example, various protective sleeves are coated on the outer periphery of a flexible pipe made of metal such as stainless steel. The protective sleeve that covers the outer circumference of the flexible pipe prevents the flexible pipe from expanding due to fluid pressure during actual use,
It is provided for the purpose of protecting the flexible pipe so as not to be damaged at the time of piping work. Conventionally, for example, a glass fiber bundled and braided into a tubular shape is used.

In recent years, the number of buildings equipped with fire extinguisher sprinklers has increased due to an increase in disaster prevention awareness against disasters such as earthquakes and fires. Longer life,
There is a strong demand for improved workability during piping work and cost reduction by weight reduction. Therefore, recently, attempts have been made to adopt a flexible tube made of resin instead of a flexible tube made of metal.

One example of such an attempt is, for example,
It is conceivable to form a flexible pipe with a thermoplastic resin generally used as various types of piping materials and cover the outer circumference with a protective sleeve made of glass fiber. In this case, the flexible pipe is designed so that the worker can easily bend it by hand during piping work.
It is formed to a thickness of about 0.9 to 1.2 mm.

[0005]

However, when such a thin resin flexible tube is used, the following problems occur. That is, when an excessive fluid pressure is applied to the inside of the resin-made flexible tube for a long period of time during actual use, the resin-made flexible tube is elongated in the longitudinal direction, and the glass fiber protective sleeve is also elongated accordingly. At this time, tension is applied to the glass fiber protection sleeve, and the end portion of the glass fiber protection sleeve fixed by a fixing member such as a ring material at the pipe connection portion is avoided. For this reason, the flexible pipe made of resin expands greatly due to the fluid pressure, and causes water leakage due to deformation. Therefore, the original function of the protective sleeve for preventing the expansion of the resin-made flexible pipe is impaired, and it becomes difficult to reliably transfer the high-pressure fluid for a long period of time.

Therefore, it is conceivable that a protective sleeve made of polyethylene terephthalate fiber having excellent mechanical strength such as toughness is coated on the outer periphery of the resin-made flexible pipe in place of the protective sleeve made of glass fiber. Causes another problem. In other words, when the electric welding rod accidentally comes into contact with the surface of the protective sleeve or the electric welding spark falls down for a long time during piping work, the protective sleeve may partially melt, and accordingly, There is a risk that a hole will be formed in the resin flexible tube. If a hole is formed in the flexible tube, sufficient airtightness cannot be obtained in an airtightness test performed after tens to hundreds of sprinkler heads are installed, and the flexible tube cannot be used as it is.
Therefore, it is necessary to investigate a portion having a hole, which requires a great deal of labor. Furthermore, as an airtightness test, a water pressure test is usually performed. At this time, if a hole is formed in the flexible pipe, water leaks and the floor above the ceiling is soaked, and a great deal of the work is required to clean up the ceiling. It will take effort.

[0007] Further, even if a hole is formed in the protective sleeve even if no hole is formed in the resin-made flexible tube, similar to the case of using the glass fiber protective sleeve,
Since it becomes impossible to prevent the expansion of the resin-made flexible pipe, it becomes difficult to reliably transfer the high-pressure fluid over a long period of time.

The present invention has been made on the basis of the above points, and it is an object of the present invention to provide a high-pressure fluid transfer pipe using a resin flexible pipe, a high-pressure fluid transfer pipe connector, and a high-pressure fluid connection pipe. An object of the present invention is to provide a transfer piping device.

[0009]

In order to achieve the above object, a high-pressure fluid transfer pipe according to the present invention is a high-pressure fluid transfer pipe comprising a resin flexible pipe and a protective sleeve coated on the outer periphery thereof. The protective sleeve is formed by braiding a fiber having excellent spatter resistance and mechanical strength into a tubular shape. At this time, it is considered that the protective sleeve is formed by braiding an aromatic polyamide fiber into a tubular shape. It is also conceivable that the protective sleeve is formed by braiding an aromatic polyamide fiber having a thickness of 100 denier or more and 2000 denier or less into a tubular shape.

According to another aspect of the present invention, there is provided a pipe connector for transferring a high-pressure fluid, comprising: a component having a spiral groove which is substantially fitted to an outer shape of a resin-made flexible pipe; a resin-made flexible pipe; The sleeve is collectively screwed in, and the part is housed in an exterior part having a connection part to another pipe.

According to another aspect of the present invention, there is provided a piping device for transferring a high-pressure fluid to a portion having a spiral groove which is substantially fitted to an outer shape of a resin-made flexible pipe, and a pipe to another piping formed at a position opposite to a longitudinal direction. From a spiral groove side, a resin flexible tube, a protective sleeve coated on the outer periphery thereof, and a flowable sealing agent attached to the protective sleeve are collectively screwed into a connecting device including a connecting portion, A piping component is attached from a connection site side to another piping in such a manner as to push back the resin flexible pipe, and the resin flexible pipe and the piping component are fixed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The constituent material of the resin-made flexible pipe used in the present invention is appropriately selected in consideration of the intended use and the like, and is not particularly limited. For example, when the pipe obtained by the present invention is used as an unwinding pipe for a fire extinguisher sprinkler, heat resistance, creep characteristics in a high temperature range, a thermoplastic resin excellent in flame resistance, for example, chlorinated polyvinyl chloride resin And polybutene resin can be preferably used. The shape, size, thickness, and the like of the resin-made flexible pipe are not limited.For example, when the pipe obtained by the present invention is used as an unwinding pipe for a fire extinguishing sprinkler, an operator can easily perform the pipe work by hand. It is preferable to form a bellows shape with a thickness of about 0.9 to 1.2 mm so that it can be bent.

The outer periphery of the resin-made flexible pipe having the above structure is covered with a protective sleeve made of a fiber having excellent mechanical strength such as spatter resistance and toughness. Examples of the fibers having excellent spatter resistance and mechanical strength include aromatic polyamide fibers. Examples of the aromatic polyamide fiber include an aggregate of para- or meta-based long fibers, or an aggregate of fibers obtained by spinning para- or meta-based short fibers. When used as an unwinding pipe for fire-extinguishing sprinklers, use para-fibers with high spatter resistance and high flame resistance that are unlikely to melt or ignite due to contact with the electric welding rod or electric welding sparks. Is preferred. Among the para-based fibers, long fibers are preferable because they have excellent tensile strength and cause less yarn breakage and fluffing during braiding.

The thickness of the aromatic polyamide fiber is 1
00 denier or more and 2000 denier or less, preferably
A material having a density of 400 to 1500 denier is used. If the density is less than 100 denier, the number of converging fibers (the number of aligned fibers) must be increased in order to obtain a desired shielding rate. In this case, however, the fibers are sagged when braided, resulting in poor appearance. This may cause breakage, yarn breakage or fluff. If it exceeds 2,000 denier, the thickness of the obtained protective sleeve becomes too large, which makes it difficult to cover the resin flexible tube and increases the cost.

A protective sleeve is formed by using one or more aromatic polyamide fibers that are aligned or twisted together and braided into a tubular shape by a conventionally known cord manufacturing method. At this time, it is preferable that the braid be formed so that the shielding ratio is 70% or more and 95% or less. If the shielding rate is less than 70%, a gap is formed in the braid of the protective sleeve. For example, when the pipe obtained by the present invention is used as an unwinding pipe for a fire extinguishing sprinkler,
At the time of the piping work, adverse effects due to electric welding sparks on the resin-made flexible pipe are feared, which is not preferable. On the other hand, when the shielding ratio exceeds 95%, the degree of freedom of the protective sleeve is hindered, and the flexibility of the resin-made flexible tube is reduced.

In the present invention, when covering the flexible sleeve made of resin with the protective sleeve, in order to prevent fraying of both ends of the protective sleeve, a silicone varnish, a silicone resin or the like diluted to an appropriate viscosity and concentration is protected. The fibers may be adhered to each other by coating or dipping at the end of the sleeve.

The pipe of the present invention thus obtained is
Since the protective sleeve is formed by braiding fibers having excellent mechanical strength such as spatter resistance and toughness into a tubular shape, it is possible to reliably prevent expansion and damage of the resin-made flexible pipe. . Therefore, it can be suitably used as an application requiring transfer of a high-pressure fluid over a long period of time, for example, as an unwinding pipe of a fire extinguisher sprinkler. Further, in the pipe of the present invention, there is no problem of corrosion, which is a concern in the conventional pipe using a metal flexible pipe, so that the life can be extended. In addition, since the weight is reduced to about 1/3 of the conventional piping using a metal flexible pipe, the weight can be reduced and the workability of the piping work is improved.

[0018]

EXAMPLES Examples of the present invention will be described below together with comparative examples. In this embodiment, it is assumed that the pipe of the present invention is used as an unwinding pipe for a fire extinguishing sprinkler. Outer diameter 27m for resin flexible tube
A bellows tube made of chlorinated polyvinyl chloride resin extruded to a thickness of 0.9 mm and having a thickness of 0.9 mm was used, and was covered with a protective sleeve having the following structure.

Example 1 Using a para-aromatic polyamide long fiber (thickness: 1500 denier, limiting oxygen index: 25%, specific gravity: 1.39), a braiding density of 15 stitches / 25 mm using a 96-stroke stringing machine. To form a protective sleeve having a shielding rate of 90%.

Comparative Example 1 Using a single polyester fiber (thickness: 1800 denier, critical oxygen index: 22%, specific gravity: 1.38), braided into a tubular shape at a braid density of 17 stitches / 25 mm using a 96-punch braiding machine. Thus, a protective sleeve having a shielding rate of 90% was produced.

Comparative Example 2 Alkali-free glass fiber (540 TEX count, specific gravity 2.8)
4) Using one strand, braid density 15 with 96-strand
A protective sleeve having a shielding rate of 90% was produced by braiding in a cylindrical shape with eyes / 25 mm.

Here, the above three types of pipes are used as samples.
Characteristic evaluation was performed. The evaluation items were flame resistance, spatter resistance, abrasion strength, and water pressure strength, and the following tests were respectively performed. The results are shown in Table 1.
Table 1 also shows, as a reference example, the results of evaluating the hydraulic strength of the resin-made flexible pipe itself not covered with the protective sleeve.

The flame resistant First, laid absorbent cotton horizontal desk and outer flame 5 inches, a 3/8 inch gas burner adjusted to inner flame 1.5 inches placed thereon. Next, above the gas burner,
The sample was held horizontally so that the tip of the internal flame of the gas burner was in contact with the protective sleeve surface. After the gas burner was ignited for 10 seconds, the flame was removed, and the ignition and burning time of the protective sleeve at this time was measured by a stopwatch, and the time until self-extinguishing was defined as the burning time. In addition, it was visually observed whether the absorbent cotton burned due to the dripping phenomenon during the period from ignition to self-extinguishing. Further, after the test was completed, it was visually observed whether a hole was formed on the surface of the protective sleeve due to melting or shrinkage of the fiber.

Spatter resistance A galvanized steel pipe is brought into contact with an iron welding rod at a position 30 cm above a horizontally held sample to generate a welding spark,
This was allowed to fall on the sample for 30 seconds. Then, it was visually confirmed whether or not a hole was formed in the surface of the resin-made flexible tube.

Abrasion Strength First, the tape abrasion strength was measured in accordance with JIS C 3406. At this time, the type of tape used was 150 AA. Next, the blade wear strength was measured according to the blade reciprocation method (load 510 g) of the wear resistance test of JASO D608.

Water pressure strength A predetermined water pressure (internal fluid pressure) is applied to the inside of the resin-made flexible pipe to perform a water-pressure test, and the pressure at which water leakage occurs due to breakage or deformation of the resin-made flexible pipe due to breakage of the protective sleeve. Was measured.

[0027]

[Table 1]

According to the results shown in Table 1, first, regarding the flame resistance, in Comparative Example 1 provided with a protective sleeve made of polyester fiber, a hole was formed in the surface of the protective sleeve, and the resin-made flexible pipe inside was exposed. On the other hand, in the case of this example, no abnormality was observed. Regarding the spatter resistance, in the case of this example, no abnormality was recognized, but in Comparative Example 1 having the protective sleeve made of polyester fiber, a hole was opened in the protective sleeve surface due to welding sparks. Along with this, a hole was partially formed on the surface of the resin-made flexible tube. With respect to the abrasion strength, the abrasion resistance of this example was significantly higher than that of Comparative Example 1 having a protective sleeve made of polyester fiber and Comparative Example 2 having a protective sleeve made of glass fiber. With respect to the water pressure strength, according to the present embodiment, the protective sleeve is at least 1.3 times the comparative example 1 having the protective sleeve made of polyester fiber, more than twice the comparative example 2 having the protective sleeve made of glass fiber. The strength was at least three times higher than that of the reference example having no.

As described above, the pipe according to the present embodiment has excellent flame resistance, spatter resistance, wear strength and water pressure strength, and it has been proved that the expansion and damage of the resin flexible pipe can be reliably prevented. .

Next, a piping connector according to another embodiment of the present invention will be described with reference to FIG. FIG. 1 is a one-side sectional view of a pipe connector according to the present embodiment. First, reference numeral 1 denotes a flexible tube made of a chlorinated polyvinyl chloride resin bellows tube having an outer diameter of 27 mm and a wall thickness of 0.9 mm, and the outer periphery of which is formed by braiding an aromatic polyamide fiber into a tubular shape. The protective sleeve 2 is covered. Reference numeral 3 denotes a component (ring material) having a spiral groove 3a that fits approximately with the outer shape of the resin-made flexible tube 1, and is formed of a chlorinated polyvinyl chloride resin similarly to the resin-made flexible tube 1.
Reference numeral 4 denotes an exterior part formed in a size that can accommodate the component 3 having the spiral groove 3a, and has a connection part 4a to other piping parts. The exterior part 4 is also formed of a chlorinated polyvinyl chloride resin like the flexible pipe 1 made of resin.

Here, the resin flexible tube 1 covered with the protective sleeve 2 is connected to a component 3 having a spiral groove 3a.
Then, the part 3 is housed in the exterior part 4 to complete the piping connector. In this embodiment, a cap nut 5 is further mounted on the outer peripheral surface of the exterior part 4 so that the component 3 having the spiral groove 3a is securely housed and fixed in the exterior part 4.

Next, a piping device according to another embodiment of the present invention will be described with reference to FIG. FIG. 2 is a one-side sectional view of the piping device according to the present embodiment. First, reference numeral 1 denotes an outer diameter 2
This is a flexible tube made of a chlorinated polyvinyl chloride resin tube having a thickness of 7 mm and a wall thickness of 0.9 mm, and a protective sleeve 2 formed by braiding an aromatic polyamide fiber into a tubular shape. . Note that a sealing agent (not shown) is attached in advance to both ends of the protective sleeve 2 and a connection portion with a connector 13 described later. This sealing agent aims at a greater effect of preventing the water leakage and the degree of coupling between the flexible pipe made of resin and the pipe connection part, and before the curing, the liquid is in a flowable state such as a paste.
It is a material that becomes solid when exposed to the air or heated to exhibit a sealing effect. Conventionally, various types such as a silicone-based filler, a polyurethane-based filler, and an acrylic-based filler have been commercially available, and these may be appropriately selected and used. In this example, a silicone-based filler was used. Reference numeral 13 denotes a connection tool including a portion having a spiral groove 13a that is fitted substantially into the outer shape of the resin-made flexible tube 1 and a connection portion 13b to another piping component 14, and is similar to the resin-made flexible tube 1. Made of chlorinated polyvinyl chloride resin.

Here, the flexible resin tube 1 covered with the protective sleeve 2 is inserted into the spiral groove 13 of the connecting member 13.
a from the side having the a.
The piping component 14 is attached in such a manner that the resin flexible pipe 1 is pushed back from the side of the connection portion 13b to the other piping component 14. Thereby, the resin-made flexible pipe 1 and the piping component 14 are firmly fixed, and the piping device is completed.

[0034]

As described above in detail, according to the present invention, by using a fiber having excellent spatter resistance and mechanical strength as a constituent material of a protective sleeve, a resin material which could not be obtained conventionally can be obtained. A high-pressure fluid transfer pipe using a flexible pipe, a high-pressure fluid transfer pipe connector, and a high-pressure fluid transfer pipe apparatus could be obtained. Therefore, in recent years,
It can be suitably used for unwinding pipes for fire extinguishing sprinklers, for which long life is expected due to improved corrosion resistance, workability is improved due to weight reduction, and cost reduction is strongly desired. .

[Brief description of the drawings]

FIG. 1 is a one-side sectional view showing a configuration example of a piping connector for transferring high-pressure fluid according to the present invention.

FIG. 2 is a one-side sectional view showing a configuration example of a piping device for transferring high-pressure fluid according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Resin flexible pipe 2 ... Protective sleeve 3 ... Parts having a spiral groove (ring material) 3a ... Spiral groove 4 ... Exterior part 4a ... Connection part to other piping parts 5 ... Cap nut 13 ... Connector 13a ... Spiral Groove 13b: Connection part to other piping parts 14: Other piping parts

Claims (5)

[Claims] 1. A high-pressure fluid transfer pipe comprising a resin-made flexible pipe and a protective sleeve coated on the outer periphery thereof, wherein the protective sleeve is formed of a fiber having excellent spatter resistance and mechanical strength. A high-pressure fluid transfer pipe, which is formed by braiding into a pipe. 2. The high pressure fluid transfer pipe according to claim 1, wherein the protective sleeve is formed by braiding an aromatic polyamide fiber into a tubular shape. 3. The high pressure according to claim 1, wherein the protective sleeve is formed by braiding an aromatic polyamide fiber having a thickness of 100 to 2,000 denier in a tubular shape. Fluid transfer piping. 4. A resin-made flexible tube and a protective sleeve covered on its outer periphery are screwed together into a part having a spiral groove which fits substantially into the outer shape of the resin-made flexible pipe, and the part is connected to another part. A high-pressure fluid transfer piping connector housed in an exterior portion having a connection portion to a pipe. 5. A connector comprising a portion having a spiral groove which is substantially fitted into an outer shape of a resin-made flexible tube, and a connection portion to another pipe formed at a position opposite to the longitudinal direction,
From the spiral groove side, the resin-made flexible pipe, the protective sleeve coated on the outer circumference and the flowable sealing agent attached to the protective sleeve are screwed in a lump and from the connection site side to other pipes. A piping device for high-pressure fluid transfer, wherein a piping component is attached in such a manner as to push back the resin flexible tube, and the resin flexible tube and the piping component are fixed.