JPH09294822A - Tube body structure for sprinkler unwinding pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent electric corrosion, reduce the number of part items, and attain excellent workability by fixing an insulating sleeve having a slidable outer periphery to the straight tube section of a sprinkler unwinding pipe, and rotatably fitting a single nipple provided with a coupling section on the outer periphery of the sleeve. SOLUTION: A single nipple 14 and an insulating sleeve 12 having a slidable outer periphery are integrally fixed on the outer periphery of a straight tube section 11 on one end side of a stainless steel pipe 10, and the single nipple 14 is slip-off preventive via a C-ring 17 kept in contact with the small-diameter step section 12b of the sleeve 12. When the stainless steel pipe 10 which is a sprinkler unwinding pipe is connected to a joint such as the T joint or elbow of fire extinguishing pipe arranged in the ceiling, the single nipple 14 is rotated while the stainless steel pipe 10 is fixed, and the screw section 14b of the single nipple 14 can be screwed to the joint, and the connecting work can be easily conducted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular body structure for sprinkler unwinding piping, which is intended to prevent electrolytic corrosion and does not use a cap nut at a joint portion of a pipe end.

[0002]

2. Description of the Related Art As is well known, a sprinkler unwinding pipe has one end of its pipe connected to a joint of a fire extinguishing pipe arranged on the back side of a ceiling or the like, and the other end of the pipe has a ceiling or the like. A sprinkler head protruding from the front side is attached.

Such a sprinkler unwinding pipe is advantageous in terms of simplification of piping work and excellent durability.
In recent years, as shown in FIG. 6, a stainless steel pipe 1 having a bellows portion 1a has been widely used. This stainless steel pipe 1 has a nipple 8 whose one end is attached to a joint 2a such as cheese or an elbow that branches from the fire extinguishing pipe 2.
After attaching and connecting the cap nut 6 to and pulling out, the bellows portion 1
Pipes are formed by flexibly bending the portions a ..., and the pipe end portion of the straight pipe portion 1b on the other end side is connected to the sprinkler head 4 mounted on the front side of the ceiling 3.

However, when such a stainless steel pipe 1 is used as a sprinkler unwinding pipe, a dissimilar metal part such as a fire extinguishing pipe 2, a cap nut 6, a nipple 8 or a support tool (not shown) for fixing the stainless steel pipe 1 is used. It is necessary to prevent electrolytic corrosion due to the potential difference generated between the other members and the electrolytic corrosion due to stray current generated in the building due to leakage current and the like.

Therefore, conventionally, as a stainless steel pipe,
For example, a tubular structure as shown in FIG. 7 is used. That is, the stainless steel pipe 1 having the bellows portion 1a
Flare portion 1c is formed on the straight pipe portion 1b, an insulating sleeve 5 having a step portion is fitted on the depth side of the flare portion 1c, and a sealing packing 7 is fitted on the tip end side of the flare portion 1c. .

The insulating sleeve 5 and the flare portion 1
c, the cap nut 6 including the sealing packing 7 is rotatably attached to the step portion of the insulating sleeve 5 while the base portion of the cap nut 6 is retained and prevented from coming off.
The screw part on one side of the nipple 8 connected to the joint 2a is screwed. The nipple 8 is insulated from the stainless steel pipe 1 via the sealing packing 7 and water leakage is prevented, and the cap nut 6 is insulated from the stainless steel pipe 1 via the insulating sleeve 5. There is.

Therefore, at the time of constructing such a sprinkler unwinding pipe, first, the nipple 8 is individually screwed and attached to the branch pipe outlet of the joint 2a, and then the cap nut 6 is attached to the threaded portion of the nipple 8. The threaded portion is screwed and tightened and fixed, the stainless steel pipe 1 is connected from the fire extinguishing pipe 2 so as to branch and lead out, and the sprinkler head 4 is attached to the pipe end of the stainless steel pipe 1.

[0008]

By the way, in such a tube structure, it is possible to prevent electrolytic corrosion on the stainless steel pipe 1 used as the sprinkler unwinding pipe, but in the connecting work, the cap nut 6, In addition to the insulating sleeve 5, the sealing packing 7, etc., the nipple 8 as a separate component must be prepared, and the number of steps of the connecting work increases due to the large number of parts, and if the nipple 8 is lost, the connecting work can be performed. Disappear.

If the cap nut 6 of the stainless steel pipe 1 is firmly attached to the nipple 8 connected to the joint 2a as it is, then the stainless steel pipe 1 is rotated in the disposing position of the sprinkler head 4. Therefore, it is necessary to loosely attach the cap nut 6 so that the cap nut 6 can be rotated, and after the arrangement position of the sprinkler head 4 is determined, the cap nut 6 is firmly tightened.

The present invention has been made under the above circumstances, and aims to prevent electrolytic corrosion, reduce the number of parts without using a cap nut at the joint portion of the pipe end of a stainless steel pipe, and reduce the cost. The purpose of the present invention is to provide a pipe body structure of the sprinkler unwinding pipe having excellent workability.

[0011]

In order to achieve the above-mentioned object, the present invention is drawn out from a fire extinguishing pipe arranged on the back side of a ceiling or the like through a joint, and the pipe end thereof has a ceiling or the like. In the pipe structure of the sprinkler unwinding pipe to which the sprinkler head protruding from the front side of is attached, the straight pipe portion on one end side of the sprinkler unwinding pipe connected to the joint can be slid with a small friction coefficient. It is characterized in that an insulative sleeve having an outer peripheral surface is integrally fixed, and a single nipple provided with an engaging portion for engaging with a joint is rotatably attached to the outer periphery of the sleeve while preventing the sleeve from coming off.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory sectional view showing one end side of a tubular body structure of a sprinkler unwinding pipe according to the present invention, and FIG. 2 is an explanatory sectional view showing another end side of the tubular body structure in FIG. .

As shown in FIG. 1, the sprinkler unwinding pipe is formed by a stainless steel pipe 10 having a bellows portion 10a. A pipe end portion on one end side of the stainless steel pipe 10 is formed as a straight pipe portion 11.
The straight pipe portion 11 side is the side connected to the joint (cheese, elbow, etc.) 2a of the fire extinguishing pipe 2 shown in FIG.

Further, on the outer periphery of the straight pipe portion 11, the end faces of the straight pipe portion 11 are aligned with each other so as to have an insulating property such as vinyl chloride and have a small friction coefficient so that it can be slid on a single nipple 14 described later. A sleeve 12 having an outer peripheral surface is integrally fixed.

The insulating sleeve 12 is integrally fixed to the straight pipe portion 11 by resin molding.
Specifically, the straight pipe portion 11 is firmly and integrally fixed to the outer periphery of the straight pipe portion 11 via a plurality of bulging portions 11a formed in the circumferential direction of the straight pipe portion 11.

Further, on the outer peripheral surface of the sleeve 12, two annular grooves 12a, 12a are formed to insert an O-ring 13 for preventing water leakage, and the sleeve 12 is provided at the rear portion of the sleeve 12 on the stainless steel pipe 10 side. Has a small-diameter step portion 12b. The annular groove 12a may be provided on the inner peripheral surface on the side of the single nipple 14 described later.

The joint fitted into the sleeve 12 is provided with a threaded portion 14b on the outer peripheral surface on one side of the central flange portion 14a, and is formed as a one-sided nipple 14 having a smooth portion 14c on the other side. The threaded portion 14b is screwed with a threaded portion of a joint such as a cheese or an elbow (see FIG. 6, although not shown) for branching in the fire extinguishing pipe.

The central collar portion 14a of the single nipple 14
The inner peripheral surface 16 of the smooth portion 14c is formed to have a larger diameter than the inner peripheral surface 15 of the screw portion 14b, and the straight pipe portion 11 on one end side of the stainless steel pipe 10 and the sleeve 12 fixed to the outer peripheral surface thereof.
Is inserted. The sleeve 12 and the single nipple 14 are slidable with each other.

An annular groove 12c is formed in the inner peripheral surface 16 of the one-sided nipple 14 facing the small-diameter step portion 12b of the sleeve 12 on the side of the smooth portion 14c, and the C-shaped groove 12c has an urging force. The ring 17 is inserted as a retaining member, and the protruding portion of the C-shaped ring 17 inserted into the annular groove 12c comes into contact with the small-diameter step portion 12b of the sleeve 12 to prevent the single nipple 14 from coming off. Is planned.
As the C-shaped ring 17, a steel wire made of phosphor bronze or stainless steel having a spring constant is used.

C-shaped ring 17 as a retaining member
Is the stainless steel pipe 10 on the inner peripheral surface 16 of the single nipple 14.
In a state where the straight pipe portion 11 on one end side and the sleeve 12 fixed to the outer peripheral surface thereof are inserted and fitted, to the inner peripheral surface 16 of the one nipple 14 and the annular opening portion which is a gap of the sleeve 12,
When it is inserted in a bent state and moved to a position where it abuts on the small-diameter step portion 12b, it expands due to its urging force.
Is inserted into.

As described above, the insulative sleeve 12 having the outer peripheral surface slidable with the single nipple 14 is integrally fixed to the outer periphery of the straight pipe portion 11 on one end side of the stainless steel pipe 10, and the single nipple is further attached. Since 14 is configured to be prevented from coming off through a C-shaped ring 17 that abuts the small-diameter step portion 12b of the sleeve 12, a joint for cheese, elbow, etc. in a fire extinguishing pipe that is piped on the back side of the ceiling or the like When connecting the stainless steel pipe 10 which is the sprinkler unwinding pipe to the stainless steel pipe 10
Even in the fixed state, the one nipple 14 can be rotated to screw the screw portion 14b of the one nipple 14 into the joint, so that the connection work can be easily performed.

Further, even after the connection of the stainless steel pipe 10 to the joint is completed, the stainless steel pipe 10 can be freely rotated by 360 °, so that the sprinkler head can be piped at any position to reduce the work and improve the efficiency. Can be planned.

Further, in the conventional case shown in FIG. 7, a cap nut 6 attached to the end pipe portion of the straight pipe portion 1b of the stainless steel pipe 1, a nipple 8 as a separate component connected to the cap nut 6, Although the joint structure requires the insulating sleeve 5 to be fitted to the straight pipe portion 1b, the sealing packing 7, and the like, this pipe body structure does not require the single nipple 8 prepared as a separate component, The cost can be reduced as a joint structure of the pipe end portion with a small number of parts.

Further, the straight pipe portion 11 of the stainless steel pipe 10
Since the insulative sleeve 12 fixedly attached to is integrally fixedly formed on the straight pipe portion 11 by resin molding, the fixing work can be simplified and the labor at the time of fixing can be reduced.
In addition, it is possible to prevent electrolytic corrosion on the stainless steel pipe 10. For this reason, it is possible to reduce the labor of the piping work in the field work and to provide a pipe structure of the sprinkler unwinding pipe with low cost and good workability. A space is formed by the straight pipe portion 11, the sleeve 12, and the inner peripheral surface 16 of the cap nut 14, and a packing is inserted to further enhance watertightness.

On the other hand, FIG. 2 is a sectional view for explaining the other end side of the pipe body in FIG. 1, and shows the side to which the sprinkler head 4 in FIG. 6 is attached. The straight pipe portion 11 shown in this figure has a polygonal cross section (see FIG. 4) at its central portion, and an insulating sleeve 18 made of a resin member is melted and fixed to the outer periphery of this portion.

Even if a fixing support (not shown) for fixing the outer circumference of the insulating sleeve 18 to a bar made of a different metal is sandwiched, the stainless steel pipe 10 is ensured to have an insulating property and is electrolytically corroded. Prevention is achieved. Of course, the insulating sleeve 18 may be attached to a desired tubular body portion to be held by the fixing support tool.

It should be noted that the insulating sleeve 18 may be provided at its outer periphery with an uneven portion for preventing rotation in the longitudinal direction thereof. Further, the pipe end of the joint component 19 to which the sprinkler head is connected is welded to the pipe end of the straight pipe portion 11 by welding 19a.
Are integrally connected by.

Next, FIG. 3 shows a second example of the straight pipe portion 11 on the one end side shown in FIG. 1, and the end portion of the straight pipe portion 11 is brought into contact with the end surface of the sleeve 12 by pipe expansion processing. The flare portion 20 is formed, and the packing 21 for preventing water leakage is arranged in the space formed by the flare portion 20, the sleeve 12 and the straight pipe portion 11, and is shown in FIG. In addition to the effect of the straight pipe portion 11 on the one end side, water leakage is further prevented and water tightness is enhanced.

FIG. 5 shows the straight pipe portion 11 on the one end side shown in FIG.
In the third example, the straight pipe portion 11 is formed by bending, and the straight pipe portion 11 formed by bending is fixed and molded so as to be embedded in the sleeve 12, and the sleeve 12 is firmly fixed to the straight pipe portion 11. It is integrated with. Thereby, the watertightness can be further enhanced.

[0030]

As described above, according to the present invention, a single nipple is connected to a stainless steel pipe joint through a sleeve having an insulating property without using a cap nut in the joint portion of the stainless steel pipe to be the sprinkler unwinding pipe. Since it is configured to be rotatably attached to the part, it is possible to prevent electrolytic corrosion and reduce the number of parts as there is no need to intervene a nipple for connecting to the joint of the fire extinguishing pipe as a separate part as in the past. it can.

Further, the connection between the stainless steel pipe and the joint is completed only by attaching the single nipple to the joint by screwing or the like, the connecting work can be simplified, and the stainless steel pipe is fixed by a fixing support or the like. The connection work can be performed later.

Further, even after the connection between the stainless steel pipe and the joint is completed, the stainless steel pipe can be freely rotated by 360 °, so that the sprinkler head can be arranged at an arbitrary position to reduce the work and improve the efficiency. Can be planned.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing one end side of a tubular body structure of a sprinkler unwinding pipe according to the present invention.

FIG. 2 is an explanatory cross-sectional view showing the other end side of the tubular structure in FIG.

3 is an explanatory sectional view showing a second example on one end side of the tubular structure in FIG.

FIG. 4 is a sectional view taken along line AA in FIG.

5 is an explanatory sectional view showing a third example on one end side of the tubular structure in FIG.

FIG. 6 is an explanatory view showing a pipe state of a sprinkler unwinding pipe.

FIG. 7 is an explanatory sectional view showing one end side of a tubular body structure of a conventional sprinkler unwinding pipe.

[Explanation of symbols]

 10 Stainless Steel Pipe 11 Straight Pipe 12 Sleeve 14 Single Nipple

Front Page Continuation (72) Inventor Isamu Sasaki 2-32-8 Shozuzawa, Itabashi-ku, Tokyo Inside Showa Rasenkan Co., Ltd.

Claims (6)

[Claims] 1. A pipe body structure of a sprinkler unwinding pipe, which is drawn out from a fire extinguishing pipe arranged on the back side of a ceiling or the like through a joint and has a sprinkler head projecting on the front side of the ceiling or the like at its pipe end. In the straight pipe portion at one end side of the sprinkler unwinding pipe connected to the joint, an insulative sleeve having a slidable outer peripheral surface having a small friction coefficient is integrally fixed, and A tubular body structure of a sprinkler unwinding pipe, wherein a single nipple provided with a mating engaging portion is rotatably attached to the outer periphery of the sleeve while preventing the sleeve from coming off. 2. The tubular body structure of the sprinkler unwinding pipe according to claim 1, wherein an annular groove for inserting and fitting an O-ring is bored in the outer peripheral surface of the sleeve. 3. The one-sided nipple is configured so that a C-shaped ring inserted into an annular groove formed on an inner peripheral surface abuts a small-diameter step portion of the sleeve to prevent the sleeve from coming off. The pipe structure of the sprinkler unwinding pipe according to claim 1. 4. The tubular structure of the sprinkler unwinding pipe according to claim 1, wherein the engaging portion of the one-sided nipple is a screw portion. 5. The sprinkler winding according to claim 1, wherein an insulating sleeve is integrally fixed to the outer periphery of the straight pipe portion on the other end side of the stainless steel pipe and other desired straight pipe portions. Outlet piping tube structure. 6. The insulative sleeve integrally fixed to the outer periphery of one end of the straight pipe portion is fitted and fixed to the bulging portion of the straight pipe portion. The tube structure of the sprinkler unwinding pipe described.