JPH11315974A - Copper pipe joint adapter and connecting structure for sprinkler piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water leakage by preventing the easy buckling of a copper pipe even if the copper pipe is bent with respect to a joint adapter. SOLUTION: The connecting structure of a copper pipe with a joint adapter 20 for sprinkler piping is made in such a manner that an open hole 21 is provided for receiving the copper pipe 10, an annular groove 22 is formed in the inner surface of the open hole, and a seal ring (O ring) 23 is fitted in the annular groove 22. In the position of the open hole 21 corresponding to the end part 11 of the copper pipe, the inner diameter of the open hole 21 is expanded, the copper pipe 10 is inserted into the open hole, and the diameter thereof is expanded along the inner diameter of the open hole 21. In the copper pipe 10 extended from the end part of the joint adapter to the outside, another copper pipe 30 is fitted in an coaxial manner in the portion L of a length from the end part at least equal to the diameter of the copper pipe 10 or longer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an unwinding pipe for a fire extinguisher sprinkler provided on the ceiling of a building or the like, and more particularly to a connecting structure of a copper pipe as an unwinding pipe to a joint adapter. .

[0002]

2. Description of the Related Art In buildings such as hotels and commercial buildings, it is required to install a sprinkler above a ceiling for fire prevention. These are, for example, up to 7 kg / cm ²
Because it is necessary to squirt such high-pressure water, a main pipe separated from the high-pressure main pipe is generally placed behind the ceiling, and a branch pipe is taken out from this pipe as appropriate, and this is connected to the sprinkler head joint installed on the ceiling. A pipe called an unwinding pipe for sprinklers was constructed between the pipes to guide water.

Conventionally, a steel pipe for water is often used as the unwinding pipe for the sprinkler, and the pipe is often returned by an elbow. In such a pipe, the work is complicated, the workability is poor, and skill is required. Therefore, the connection between the branch pipe and the sprinkler head has been made at a stretch by a flexible pipe. As such a flexible tube, a bellows tube made of stainless steel (hereinafter referred to as "stainless flexible tube") and a copper tube have been proposed.

[0004] A stainless flexible tube has a small bending radius,
It is often used because it has good workability such as being easily bent even by hand. However, on the other hand, there is a problem that the cost is high and the flow resistance is large because of the bellows shape. In addition, the stainless flexible pipe usually has a thickness of 0.3 mm.
Not suitable for high pressure piping because it is thin. Therefore, a metal blade is put on the outside to increase the pressure resistance and used. However, if the length is 1000 mm or more, the self-sustainability is poor, the rigidity of the length itself is low, and the material deflects under its own weight, and a large vibration occurs when water pressure or vibration is applied. Therefore, it takes extra work to fix it,
When water pressure is applied during a periodic test or the like, it collides with other pipes or the like, causing a problem that unpleasant noise is generated behind the ceiling. For these reasons, there is a point that the stainless flexible tube is not preferable as a long one.

[0005] Therefore, a copper tube is sometimes used instead of this, but at this time, a soft copper tube is used as a flexible copper tube. In the case of a copper tube, as described in Japanese Patent Application Laid-Open No. 7-208666, a flare portion is formed at the end of the soft copper tube as a connection structure with the adapter of the joint, and the tip of the flare portion is formed inside. Alternatively, a method is used in which a bent portion is formed outward and the bent flare portion is fastened to a joint portion with a cap nut. Further, a copper tube which has been bent and superposed is coated with solder to improve the sealing effect and to prevent electric corrosion due to contact of different kinds of metals.

However, it is necessary to connect both ends of the copper tube to some joints. However, if the copper tube end is bent and the flared portion is superimposed and fastened to the joint with a cap nut. If one end of the copper tube is connected and fixed to the joint, rotation of the copper tube will not occur when the other end is connected. Therefore, when the other end is connected, friction occurs between the cap nut and the flare portion of the copper tube, and the friction torque is transmitted to the opposite nut via the copper tube to loosen the opposite nut. In some cases, sufficient sealing was not performed.

Therefore, as shown in the sectional view of FIG. 4, a copper tube 10 is inserted as a joint adapter 20 and has an opening 21 for receiving the copper tube at the center thereof.
A proposal has been made in which the inner diameter of the opening 21 is increased at a position corresponding to the tube end 11 of the copper tube 10 at the opening 21. The copper tube 10 is inserted into the opening 21 of the joint adapter 20, and the tube end 11 of the copper tube 10 has a flat portion which is expanded along the inner diameter and has a flat portion at a portion where the inner diameter of the opening is widened. It has a shape. An annular groove 22 is provided on the inner surface of the opening 21 near the end 27 of the joint adapter 20,
An O-ring 23 is fitted in the annular groove 22 to make the space between the O-ring 23 and the outer periphery of the copper tube watertight. In the connection structure of a copper pipe using such a joint adapter, since the copper pipe 10 expands in diameter along the enlarged diameter portion 26 of the inner diameter of the opening 21, a pulling force is applied to the copper pipe 10 or the joint adapter 20. It has pull-out prevention performance when acted on. While fulfilling the basic function of
It has a structure that can be relatively rotated between.

[0008] As shown in the explanatory diagram of the unwinding pipe structure for sprinklers (Fig. 5), for example, a plurality of pipes (four in this figure) are connected to the tip of a pipe branched from a water supply branch pipe 60 provided on the ceiling. A branch joint 63 having a connection port of ()) is attached. The space between the branch joint 63 and each sprinkler head joint 58 is connected by a soft copper tube 10, and the sprinkler head joint 58 is attached to a fixed bar 56 behind the ceiling with a fixing bracket 59.

Here, when the copper pipe 10 is mounted between the connection port of the branch joint 63 and the sprinkler head joint 58, the connection port of the branch joint 63 and the sprinkler head joint 5
When the elbow 8 or the elbow attached thereto has female threads, the joint adapters 20 attached to both ends of the copper pipe are screwed into these connection ports and the elbow, and the copper pipe 10 is piped. . In the case of a male screw, it is connected via a male and female bushing.

[0010] As described above, the copper tube 10 and the joint adapters 20 attached to both ends thereof are structured so as to be relatively rotatable. In this connection, after one of the joint adapters 20 is screwed into the connection port of the branch joint 63 or the sprinkler head joint 58, the other one of the joint adapters 20 is connected to the remaining sprinkler head joint 58 or the branch joint 63. When screwed into the mouth, the joint adapter 20 can rotate with respect to the copper tube 10, and the connection can be made without difficulty.

[0011]

In such a connection structure between the copper pipe and the joint adapter, the connection work is easy because the relative rotation between the joint adapter and the copper pipe can be performed during piping. However, since the copper pipe has flexibility, it is necessary to bend the copper pipe at the time of piping work or after piping, and the copper pipe may be bent with the joint adapter fixed. For example, with the joint adapter attached to one side of the copper tube screwed into the sprinkler head joint attached to the fixed bar above the ceiling with fixing brackets, the joint adapter attached to the other side of the copper tube is connected to the connection port of the branch joint. In order to bring the copper pipe to the position, for example, to bend the copper pipe, or to pipe other copper pipes and conduit pipes under the same ceiling so that they cross the already piped copper pipe, Is bent.

As described above, the copper pipe is bent with respect to the joint adapter. When the copper pipe is bent in the vicinity of the joint adapter, a portion of the copper pipe inserted into the opening of the joint adapter is shaved. As a result, buckling occurs, and a gap is formed between the O-ring and the outer periphery of the copper pipe, and water leaks therefrom.

Accordingly, the present invention provides a sprinkler pipe connecting structure for connecting a copper pipe to a joint adapter, wherein the copper pipe does not easily buckle and water does not leak even when the copper pipe is bent with respect to the joint adapter. The purpose is to provide.

[0014]

According to the sprinkler pipe of the present invention, the connection structure of the copper pipe with the joint adapter has an opening for receiving the copper pipe, and has an annular groove on the inner surface of the opening. A seal ring is fitted in the annular groove, and at the position corresponding to the end of the copper tube of the opening,
It has a joint adapter with an enlarged inside diameter of the opening, and a copper tube is inserted into the opening of the joint adapter, and the end of the copper tube is enlarged at the portion where the inside diameter of the opening is enlarged. In the connection structure with the fitting adapter being provided, the copper pipe extending outward from the end of the fitting adapter, at least a portion from the end corresponding to the length of the diameter or more of the copper tube, Another copper tube is fitted concentrically.

Therefore, it is preferable that another copper tube is concentrically fitted into the enlarged diameter portion at the end of the copper tube. In the above, the end of the joint adapter has a notch concentrically with the copper tube along the outer periphery of the copper tube, and the end of the other copper tube may be inserted into the notch. it can.

In the present invention, when the other copper tube concentrically fitted is fitted inside the copper tube extending outward from the end of the joint adapter, the other copper tube is concentrically fitted with the copper tube. It is preferable that the other copper tube fitted and the further copper tube concentrically fitted to the enlarged diameter portion at the end of the copper tube are an integral copper tube.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A connection structure of a copper pipe and a joint adapter in a sprinkler pipe according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a connection structure of a first embodiment of the present invention, FIG. 2 is a sectional view of a connection structure of a second embodiment of the present invention, and FIG. 3 is a connection of a third embodiment of the present invention. FIG. 4 is a sectional view of a conventional connection structure, and FIG. 5 is an explanatory perspective view showing an example of a sprinkler unwinding pipe. In these drawings and the description thereof, common parts have the same reference numerals.

The unwinding pipe for the sprinkler piped behind the ceiling is attached to the ceiling base material as shown in the perspective view of FIG. Although not shown, the ceiling base material has hanging bolts 51 suspended from a concrete slab or the like. The suspension bolt 51 hangs down a C channel serving as a margin receiver 53 via a hanger 52. The field margin 53 is a field margin (for example, M bar) 54 and the field margin 5
3, and a ceiling board 55 is attached thereto. In this figure, a fixing bar 56 is attached to a ridge receiver 53, and a sprinkler head joint 58 to which a sprinkler head 57 is attached is attached to the fixing bar 56 with a fixing bracket 59 or the like so as to be at a predetermined position on the ceiling board 55. Have been.

As the water supply pipe, a main pipe arranged above the ceiling or a branch pipe 60 is branched from the main pipe if necessary, and then a branch is made with a cheese 61 near a place where the sprinkler head 57 is installed to form a pipe nipple 62 or the like. The piping to each sprinkler head 57 is branched by a branch joint 63 having a plurality of (four in this figure) connection ports via the. Sprinkler head joint 58 and branch joint 63
Are connected by a soft copper tube 10 (hereinafter simply referred to as a copper tube). The connection of the copper tube 10 to the branch joint 63 and the sprinkler head joint 58 is performed via a joint adapter 20 attached to an end of the copper tube 10.

FIG. 1 is a sectional view showing a first embodiment of a connecting structure of a copper pipe and a joint adapter in a sprinkler pipe according to the present invention. The joint adapter 20 may be a machined product from a forged round bar of a copper alloy or steel, or a casting or a mold forging of such a material. The joint adapter 20 has an opening 21 at the center thereof into which the copper tube 10 can be inserted and received from one end, and one or several annular grooves 22 at the inner wall surface of the opening facing the copper tube 10. An O-ring 23 is fitted on each of them as a seal ring. The O-ring 23 ensures watertightness between the inner surface of the joint adapter opening and the outer peripheral surface of the copper tube. For example, a male taper screw 24 is attached to the outer periphery of one end of the joint adapter 20, and
It is 5 or octagon so that the wrench can be hooked. At a portion of the hole 21 of the joint adapter opposite to the end 27 into which the copper tube is inserted, that is, at a position corresponding to the tube end of the copper tube, the inside diameter of the hole 21 is enlarged. End 11 of copper tube 10 inserted in opening 21 of the joint adapter
Are expanded in accordance with the inner diameter of the portion 26 whose diameter is increased. When the enlarged inner diameter of the opening has a parallel portion, the end portion 11 of the copper tube 10 also has a parallel portion accordingly.

The diameter of the copper tube 10 can be increased by inserting the copper tube 10 into the opening 21 and using a rubber bulge or the like from the inside of the copper tube 10. Thus, the enlarged diameter portion 2 is formed in the opening 21.
6, the diameter of the inserted copper tube 10 is enlarged along the copper tube 10, so that the resistance to pulling out is large.

In the connection structure with the joint adapter shown in FIG. 1, the copper tube 10 extending outward from the end portion 27 of the joint adapter 20 has a length corresponding to at least the diameter of the copper tube 10 or more. At the portion of L, another copper tube 30 is fitted concentrically. This other copper tube 3 fitted
0 has substantially the same thickness as the original copper tube 10. Preferably, the length L of the other copper tube 30 is at least twice the diameter of the original copper tube 10. The other end of the joint adapter 20 is cut out concentrically with the copper tube along the outer periphery of the copper tube so that the other copper tube 30 does not shift in the longitudinal direction with respect to the original copper tube 10. It is preferable to provide an end 28 of the other copper tube 30 in the notch 28. It is preferable that the diameter of the notch 28 be in a relationship with the other copper tube 30 in terms of an interference fit. Alternatively, by compressing the outer diameter of the other copper tube 30, the copper tube 30 is engaged with the position shown in the drawing so as not to be displaced from the copper tube 10.

Even if the copper tube 10 is bent 90 ° left and right or up and down with respect to the fixed joint adapter 20, at least the other copper tube 30 is located close to the connection between the copper tube 10 and the joint adapter 20. Since the portions longer than the diameter are fitted and doubled, buckling does not occur at those portions. As a result, the O-ring 2 of the joint adapter 20
There is no buckling at the portion of the copper tube 10 facing 3 and no water leakage due to flattening occurs.

A further copper tube 40 is concentrically fitted in the enlarged diameter portion 11 of the copper tube 10, and at least the copper tube 10 extending outward from the end portion 27 of the joint adapter 20 is attached to the copper tube 40. A portion corresponding to the length L equal to or larger than the diameter of the copper tube, co-acts with another copper tube 30 fitted concentrically to prevent buckling when the copper tube 10 is bent. .

FIG. 2 shows the connection structure of the second embodiment, in which another copper tube 40 is fitted inside the original copper tube 10. In the third embodiment shown in FIG. 3, the other copper tube 30 and the further copper tube 40 are both copper tubes 10.
And the other copper tube 30 and the other copper tube 40 are integrated. In the third embodiment, the copper tube 10 exhibits extremely strong resistance to buckling.

[0026]

As described above, in the sprinkler pipe connection structure of the present invention, the copper pipe does not easily buckle even when the copper pipe is bent with respect to the joint adapter. Since no water leaks from the seal ring portion, the workability of the unwinding pipe is improved and the reliability of the pipe is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a connection structure of a copper pipe and a joint adapter in a sprinkler pipe according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a connection structure of a copper pipe and a joint adapter in a sprinkler pipe according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a connection structure of a copper pipe and a joint adapter in a sprinkler pipe according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a connection structure of a conventional sprinkler pipe for connecting a copper pipe to a joint adapter.

FIG. 5 is an explanatory perspective view showing an example of an unwinding pipe for a sprinkler.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Copper pipe 11 End part 20 Joint adapter 21 Opening hole 22 Annular groove 23 Seal ring (O-ring) 24 Male taper screw 25 Hexagon 26 Enlarged (expanded) part 27 End part 28 Notch 30 Other copper pipe 40 Further Other copper pipes 51 Hanging bolts 52 Hangers 53 Field ridges 54 Field ridges 55 Ceiling boards 56 Fixing bars 57 Sprinkler heads 58 Sprinkler head joints 59 Fixtures 60 Branch pipes 61 Cheese 62 Pipe nipples 63 Branch joints

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazumasa Onda 2 Daifuku, Kuwana-shi, Mie Inside the Kuwana Plant of Hitachi Metals, Ltd.

Claims (4)

[Claims] 1. An opening for receiving a copper tube, an annular groove on the inner surface of the opening, a seal ring fitted in the annular groove, and an end of the opening of the copper tube. At the position corresponding to the above, there is a joint adapter whose inner diameter of the opening is enlarged, and a copper tube is inserted into the opening of the joint adapter, and copper is inserted at the portion where the inner diameter of the opening is enlarged. In the connection structure with the joint adapter in which the end of the pipe is expanded, the copper pipe extending outward from the end of the joint adapter is connected to the copper pipe from the end corresponding to at least the length of the diameter of the copper pipe or more. A structure for connecting a copper pipe to a joint adapter in sprinkler piping, wherein another copper pipe is concentrically fitted in a length portion. 2. The sprinkler pipe connection structure according to claim 1, wherein another copper pipe is concentrically fitted into the enlarged diameter portion at the end of the copper pipe. . 3. An end of the joint adapter has a cutout concentric with the copper tube along the outer circumference of the copper tube, and the end of the other copper tube is inserted into the cutout. The connection structure of a copper pipe and a joint adapter in a sprinkler pipe according to claim 1 or 2. 4. The other copper tube concentrically fitted into a copper tube extending outwardly from an end of the fitting adapter;
The joint adapter for a copper pipe in a sprinkler pipe according to claim 2, wherein the further copper pipe concentrically fitted into the enlarged diameter portion at the end of the copper pipe is an integrated copper pipe. Connection structure.