JP2005279200A - Connecting structure of sprinkler winding pipe, and sprinkler winding pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a sprinkler winding pipe connection structure which provides excellent construction property and water-tightness after construction, prevents electric contact, and reduces a cost, and to provide a sprinkler winding pipe. <P>SOLUTION: When the sprinkler winding pipe 3 is connected, an insulation member 22 is externally fitted to the end part of a pipe body 3a and a joint member 24 screw-fitted onto an opposite piping member 7 is assembled so as to be freely rotatable in a circumferential direction via an O-ring 23 of water-swelling rubber. In the case of piping, even when the pipe body 3a is fixed, the piping is performed by screwing, while rotating the joint member 24 in a circumferential direction. After the piping, the joint member 24 is attached by pressure by the water-swelling of the O-ring 23 so as to automatically stop rotating. Then water-tightness and electric contact prevention are secured in the joint member 24. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a sprinkler unwinding pipe connection structure that is excellent in workability, excellent in water tightness after construction, and capable of preventing electric corrosion and reducing costs, and a sprinkler unwinding pipe. It is.

  As shown in FIG. 7, the sprinkler unwinding pipe connects the fire fighting pipe 1 piped on the back surface side of the ceiling A and the sprinkler head 2 mounted on the ceiling A. In piping, the insulating member 4 is attached to the pipe body 3a of the sprinkler unwinding pipe 3 on the sprinkler head 2 side, the portion of the insulating member 4 is sandwiched by the mounting bracket 5, and the mounting bracket 5 is further attached to the ceiling A. It is attached to a fixing member 6 disposed on the back side.

  Thereby, the insulation with respect to the pipe main body 3a is ensured, and the stray current (leakage current etc.) generated in the building and the electric contact due to the potential difference generated between the different metals from the pipe main body 3a are prevented.

  In addition, a joint structure in which a nipple 8 is combined with a straight pipe portion 3c at the end of the pipe body 3a with respect to a branch joint portion 7 provided in the fire fighting pipe 1 at a branch point from the fire fighting pipe 1 (see FIG. 4). ) Or a sprinkler unwind tube 3 having a joint structure (see FIG. 5) in which the nipple 8 and the cap nut 9 are combined to prevent contact between different metals.

  As the sprinkler unwinding pipe 3, a flexible steel pipe such as a stainless steel pipe having a bellows portion 3b is used.

  However, the connection to the branch joint portion 7 at the nipple 8 shown in FIG. 4 is because the nipple 8 and the pipe body 3a are integrally fixed, so that the entire sprinkler unwind pipe 3 is rotated during piping. There is a problem that it is necessary, and in particular, when the tube body 3a becomes long, its rotation becomes difficult. In addition, when both ends of the sprinkler unwind pipe 3 are fixed, there is a problem that re-pipe is forced when additional tightening is required.

  On the other hand, in the case of the combination of the nipple 8 and the cap nut 9 shown in FIG. 5, the nipple 8 needs to be screwed into the branch joint portion 7 before the sprinkler unwinding pipe 3 is attached in advance. The increase was shot.

  In order to solve these problems, a sprinkler unwind tube 3 using a rotary nipple 10 has been proposed. As shown in FIG. 6, the sprinkler unwinding tube 3 has an O-ring 11 and a green member 12 interposed between a rotary nipple 10 and a tube body 3a, which are different metals. Thus, the rotation of the nipple 10 in the circumferential direction and the prevention of electrolytic corrosion are achieved.

  Specifically, a metal sleeve 13 is externally fitted to the straight pipe portion 3c at the end of the pipe body 3a, and a resin sleeve 12 is interposed between the metal sleeve 13 and the nipple 10, so that the metal The metal sleeve 13 and the resin sleeve 12 are caulked by a metal caulking ring 14, the metal stop ring 15 is used to prevent the nipple 10 from being detached, and the resin spacer 16 is connected to the branch joint 7 side. It prevents that the metal with the pipe | tube main body 3a contacts directly. The O-ring 11 is made of rubber (NBR), and one O-ring 11 is inserted between the metal sleeve 13 and the resin sleeve 12 and two are inserted between the nipple 10 and the resin sleep 12. .

  The sprinkler unwinding pipe 3 with such a rotating nipple 10 can be used for branching because the nipple 10 and the pipe body 3a can be freely rotated in the circumferential direction via the rubber O-ring 11 as described above. There is an advantage that attachment to the joint portion 7 side can be easily performed, and even if both ends of the pipe body 3a are fixed, additional tightening can be performed, and connection is completed by screwing once.

  However, such a rotary sprinkler unwinding tube 3 is easy to construct due to its rotating mechanism, but there is a problem that the rotating mechanism using the O-ring 11 works as a weak point against drainage after the construction. That is, from the viewpoint of workability, the compression rate of the O-ring 11 is set to be small so that rotation is easy. As a result, the risk of drainage increases due to the loose engagement of the O-ring 11. It will be.

  In addition, in the current situation that the resin green part 12 is sandwiched between metals for measures against dissimilar metals, the insulating member 12 receives an O-ring 11 for rotation and sealing. Since the accuracy of the insulating member 12 by injection molding is inferior to the metal processing accuracy, if the accuracy of the injection molded insulating member is increased, the price is inevitably increased. Moreover, since the inside of the sprinkler unwind pipe 3 is always used in a state where water is filled after piping, it is necessary to take measures against dissimilar metal corrosion that ensures a firm water tightness.

  The present invention has been made in view of the circumstances as described above. The purpose of the invention is to improve the workability of piping by making the end of the pipe body rotatable by an O-ring made of water-expandable rubber during construction. At the same time, it is possible to secure sufficient water tightness while automatically rotating the end of the tube body by O-ring water expansion by water expansion rubber after construction, and to prevent electric corrosion and reduce costs. It is an object to provide a sprinkler unwinding pipe connection structure and a sprinkler unwinding pipe.

In order to confuse the above object, the present invention provides a sprinkler unwinding pipe connecting structure as claimed in claim 1 and a fire fighting pipe piped on the back side of the ceiling and a sprinkler mounted on the ceiling. In the connection of the sprinkler unwind pipe that connects the head,
An insulating member is fitted and fixed to the end side of the pipe body constituting the sprinkler unwinding pipe, and a joint member screwed to the other pipe member is rotatable in the circumferential direction via an O-ring of water expansion rubber. The joint member can be rotated in the circumferential direction even when the pipe body is fixed before the O-ring is expanded, and after the O-ring is expanded, the O-ring is expanded. The member is crimped to stop rotation, and when the pipe is installed, the joint member can be screwed while rotating in the circumferential direction even when the pipe main body is fixed. The joint member is pressure-bonded by expansion to automatically stop rotating, and water-tightness and electric corrosion prevention of the joint member are ensured.

In addition, as a sprinkler unwinding pipe, as described in claim 2, in the connection of the sprinkler unwinding pipe connecting the fire fighting pipe piped on the back side of the ceiling and the sprinkler head mounted on the ceiling,
A metal sleeve that is externally fitted and fixed to the end of the pipe body constituting the sprinkler unwinding pipe, a resin ring that is externally fitted and fixed to the metal sleeve, and the metal sleeve and the resin ring. A joint member that is loosely fitted to the outer periphery of the resin ring and an O-ring that is formed of water expansion rubber and is fitted to the resin ring side. In the circumferential direction, and after the construction of the piping, the joint member is brought into a rotation stop state by pressure bonding due to water expansion of the O-ring, and water tightness and anti-corrosion prevention in the joint member are ensured. As described in claim 3, the annular groove for insertion of the O-ring is formed by externally fitting a resin ring on a step portion formed on the outer periphery of the metal sleeve, so that the adjacent resin rings are adjacent to each other. Septum, characterized in that it is ensured by.

  As an effect of this invention, while reducing the manufacturing cost, at the time of piping construction, the end of the pipe body is freely rotatable to improve workability, and after piping construction, sufficient water tightness is automatically secured, In addition, it is possible to provide a sprinkler unwinding pipe connection structure that prevents electric corrosion and a sprinkler unwinding pipe.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory sectional view showing an end structure of a sprinkler unwinding pipe according to the present invention. In addition, FIG. 7 is used as a connection structure diagram of the sprinkler unwinding pipe.

  As shown in FIG. 1, the sprinkler unwinding pipe 3 according to the present invention uses a flexible steel pipe such as a stainless steel pipe having a bellows portion 3b. A metal sleeve 20 is fitted on the outer periphery of the tube body 3a on the end side. A step portion 21 is formed on the outer peripheral surface of the sleeve 20. Specifically, the first step portion 21 a drilled on the bellows portion 3 b side of the metal sleeve 20, the central portion of the metal sleeve 20. The second step portion 21b is formed in the first sleeve portion, and the third step portion 21c and the fourth step portion 21d are formed in the metal sleeve 20 on the opposite side of the bellows portion 3b side.

  A resin ring 22 is fitted on the step portion 21 on the peripheral surface of the metal sleeve 20. Specifically, a first resin ring 22a is inserted into the first step portion 21a so as to fit into the full width of the step portion, and a second resin ring 22b is stepped into the second step portion 21b. The third resin ring 22c is inserted into the third step portion 21c so as to fit in shorter than the full width of the portion, and the convex portion 22c ′. Is inserted so as to be shorter than the full width of the second step portion. In addition, a fourth resin ring 22d is engaged with the fourth step portion 21d, and the convex portion 22d 'is inserted and fitted so as to be shorter than the entire width of the third step portion 21c.

Thus, the second resin ring 21b and the convex portion 22c of the third resin ring 21c 'can form a clearance (annular groove) S _1, a third resin ring 21c and the fourth resin by a manufacturing ring convex portion 22d of the 22d 'can be clearance _{S 2.} O-rings 23 made of water-expanded rubber are inserted into the clearances S ₁ and S ₂ . It is preferable that the O-ring 23 is formed to be large on the side (right side in the drawing) from which water enters and to be small on the downstream side.

  A joint member (a nipple in this embodiment) 24 is rotatably fitted on the outer periphery of the resin ring 23. An annular groove 24a is formed on the inner peripheral surface near the end of the bellows portion 3b. A metal stop ring 25 is inserted into the annular groove 23a of the nipple 23, and the metal sleeve 20 that is externally fitted to the pipe body 3a is brought into contact with the first resin ring 22a. Is regulated.

  Since the sprinkler unwinding pipe 3 according to this embodiment is configured as described above, at the time of piping, the nipple 24 attached to the pipe body 3a is abutted against the branch joint portion 7 and the nipple 24 is rotated to be screwed together. To do. At this time, since the O-ring 23 formed of the water expansion rubber does not contain water and is in an original state before being expanded, the nipple 24 is rotatable in the circumferential direction. That is, even if the pipe body 3a is in a fixed state, the nipple 24 can be freely rotated in the circumferential direction, and workability at the time of piping construction can be improved.

  Further, after the construction, the sprinkler unwinding pipe 3 is always pressurized with a water pressure of about 1.0 MPa, and water enters a slight gap between the nipple 24 and the resin ring 22, but the sprinkler unwinding pipe 3 is in contact with the water. The O-ring 23 expands and changes from the state shown in FIG. 2A to the state shown in FIG. 2B, and is strongly pressed against the inner peripheral surface of the nipple 24 by its own expansion force. In addition to stopping the rotation, water intrusion to the downstream side is prevented and high water tightness is secured. Note that the O-ring arranged on the downstream side fulfills the function of watertightness when water leaks from the upstream O-ring.

  Between the nipple 24 and the tube main body 3a and the metal sleeve 20 fitted on the tube main body 3a, a resin ring 22 formed in a divided manner is formed at a step portion 21 formed on the peripheral surface of the metal sleeve 20. Since it is externally fitted to insulate between the metal sleeve 20 and the nipple 24, and the clearance S for inserting the O-ring is formed, the labor for injection molding is reduced.

  Further, since the O-ring is not a simple rubber material as in the prior art, but is made of a water-expanded rubber material, the water tightness can be improved even when the molding accuracy of the O-ring is rough. Even when the joining accuracy with the metal sleeve 20 is rougher than before, the watertightness can be improved.

Further, the clearances S ₁ and S ₂ for insertion of the O-ring 11 do not form an annular groove on the outer periphery of the resin body as in the prior art, but are formed on the step portion 21 on the peripheral surface of the metal sleeve 20. Since it can be formed by externally fitting the resin ring 22, the manufacturing cost can be further reduced.

  Therefore, the manufacturing cost is reduced, the end of the pipe body is rotatable during construction to improve the workability of the piping, and after construction, sufficient water-tightness is automatically secured and electric corrosion prevention is achieved. The sprinkler unwinding pipe connection structure and the sprinkler unwinding pipe can be provided.

  FIG. 3 shows a second embodiment in which one resin ring 22 is arranged. In this case, similarly to FIG. 1, the outer peripheral surface of the sleeve 20 is drilled in the first step portion 21a drilled on the bellows portion 3b side of the metal sleeve 20 and the central portion of the metal sleeve 20. The second step portion 21b and the third step portion 21c formed on the side opposite to the bellows portion 3b side of the metal sleeve 20 are formed. In addition, the first resin ring 22a is inserted into the first step portion 21a so as to fit into the full width of the step portion, and the second resin ring 22b is inserted into the second step portion 21b from the full width of the step portion. The third resin ring 22c is inserted into the third step portion 21c so as to be shorter than the full width of the step portion, and the convex portion 22c ′ is formed in the second step portion 21c. It is inserted so that it may be shorter than the full width of the step. In addition, a fourth resin ring 22d is engaged with the fourth step portion 21d, and the convex portion 22d 'is inserted and fitted so as to be shorter than the entire width of the third step portion 21c.

Thus, the second resin ring 21b and the convex portion 22c of the third resin ring 21c 'can form a clearance S _1, the third resin ring 21c and the fourth resin ring 22d the convex portion 22 d 'may be clearance _{S 2.} O-rings 23 made of water-expanded rubber are inserted into the clearances S ₁ and S ₂ . It is preferable that the O-ring 23 is formed to be large on the side (right side in the drawing) from which water enters and to be small on the downstream side.

It is sectional drawing for description which shows the edge part structure of the sprinkler unwinding pipe | tube which concerns on this invention. It is explanatory drawing which shows the fitting state of an O-ring. It is a connection structure figure which shows the 2nd Example which concerns on this invention. It is an external view which shows the edge part of the sprinkler unwinding pipe of the joint structure which combined the nipple. It is an external view which shows the edge part of the sprinkler unwinding pipe of the joint structure which combined the nipple and the cap nut. It is an external view which shows the edge part of the sprinkler unwinding pipe of the conventional rotary type nipple joint structure. It is a connection structure figure which shows one example of the connection of a sprinkler unwinding pipe.

Brief description of symbols

DESCRIPTION OF SYMBOLS 3 Sprinkler unwinding pipe 3a Pipe main body 3b Bellows part 3c Straight pipe part 20 Metal sleeve 21 Metal sleeve step part 22 Resin ring 23 Water expansion rubber O ring 24 Rotating nipple 25 Metal stop ring

Claims (3)

In the connection of the sprinkler unwinding pipe that connects the firefighting pipe piped on the back side of the ceiling and the sprinkler head mounted on the ceiling,
An insulating member is fitted and fixed to the end side of the pipe body constituting the sprinkler unwinding pipe, and a joint member screwed to the other pipe member is rotatable in the circumferential direction via an O-ring of water expansion rubber. The joint member can be rotated in the circumferential direction even when the pipe body is fixed before the O-ring is expanded, and after the O-ring is expanded, the O-ring is expanded. The member is crimped to stop rotation, and when the pipe is installed, the joint member can be screwed while rotating in the circumferential direction even when the pipe main body is fixed, and after the pipe construction, the O-ring water The sprinkler winding is characterized in that the joint member is pressure-bonded by expansion to automatically stop rotation, and the water-tightness and anti-electrolytic property of the joint member are ensured. The connection structure of the tube. In connecting the sprinkler unwinding pipe that connects the fire fighting pipe piped on the back side of the ceiling and the sprinkler head mounted on the ceiling,
A metal sleeve that is externally fixed to the end of the pipe body constituting the sprinkler unwinding tube, a resin ring that is externally fixed to the metal sleeve, and the metal sleeve and the resin ring. A joint member that is loosely fitted to the outer periphery of the resin ring while being prevented from coming off, and an O-ring that is formed of water-expandable rubber and is fitted to the resin ring side. In the circumferential direction, and after the construction of the piping, the joint member is brought into a rotation stop state by pressure bonding due to water expansion of the O-ring, and the water tightness and the anti-corrosion property of the joint member are ensured. Sprinkler unwinding tube characterized by   The annular groove for insertion of the O-ring is secured by a resin ring fitted on a step portion formed on the outer periphery of the metal sleeve, and is secured by a space between the adjacent resin rings. 1 or 2 sprinkler unwinding pipe.

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