JPH0630599U - Pipe fitting - Google Patents

Abstract

(57) [Abstract] [Purpose] A pipe joint used as a branch saddle for fire hydrants that is joined to a main pipe for a fire hydrant in a branched manner. To do. [Structure] The first seal member 28 and the collar 27 are fitted to the joint body 21 inserted through the pipe side connection port portion 130 of the pipe wall 110, and the second seal member 29 is provided between the collar 27 and the joint body 21. Intervene. By screwing and tightening the nut body 30 into the joint body 21, the flange portion 25 on the joint body 21 side is overlapped with the inner surface of the pipe wall, and the first seal member 28 is pressed by the collar 27 and the pipe wall 110. The projecting portion 26 of the flange portion 25 is fitted into the tension outlet portion 132 of the pipe-side connection opening portion 130 to prevent the nut body 30 and the joint body 21 from being rotated together.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint used as a branch saddle for fire hydrants.

[0002]

[Prior art]

 FIG. 7 shows a conventional pipe joint A used as a branch saddle for a fire hydrant. In this pipe joint A, a flange portion 2 is integrally provided at a base end portion of a cylindrical joint body 1, and projecting piece portions 3 are stepwise projected at a plurality of inner peripheral portions of the flange portion 2, The joint body 1 is provided with a joint side connection port portion 4 at the tip end portion thereof. In this pipe joint A, a plurality of protruding pieces 3 are inserted into a pipe side connection opening 120 formed in the pipe wall 110 of the pipe body 100 and having a circular shape in plan view, and the rear surface of the flange portion 2 is set to the outer surface of the pipe wall 110. After overlapping, the outer peripheral end surface 2a of the flange portion 2 and the outer surface 110a of the pipe wall 110 are welded S to be joined to the pipe body 100. Then, a sprinkler unwinding pipe or the like as a branch pipe is screwed and connected to the taper female screw portion 4a provided in the joint side connection port portion 4.

In some cases, mechanical cheases have been used as a conventional pipe joint used as a branch saddle for fire hydrants.

[0004]

[Problems to be solved by the device]

 However, since the pipe joint A in FIG. 7 is joined to the pipe body 100 by welding, it is troublesome that an operation to remove the plating must be performed when the pipe body 100 is plated. In addition, the pipe joints used as branch saddles for fire hydrants had the inconvenience that welding engineers were required to perform advanced welding in places where welding work was difficult, such as in the ceiling.

On the other hand, there is a problem that it is expensive to use mechanical cheese as a pipe joint.

The present invention has been made in view of the above inconveniences and problems, and by making it possible to connect to a pipe body by a screwing method, it is possible to eliminate the need for welding connection and thus be inexpensive. An object is to provide a pipe joint for a branch pipe.

[0007]

[Means for Solving the Problems]

 In the pipe joint of the invention of claim 1, a pipe-side connection port portion is provided at a predetermined position on the peripheral portion of a large-diameter hole portion having a circular shape in a plan view, and a bulging hole portion bulged outside the hole portion is provided. A cylindrical joint body to be inserted into the large-diameter hole portion of the pipe-side connection opening portion of the pipe body formed on the pipe wall; and a joint-side connection opening portion provided at the tip of the joint body, A male thread portion provided on the outer surface of the front end portion of the joint body, a flange portion integrally provided on the base end portion of the joint body and superposed on the inner surface of the peripheral portion of the pipe side connection opening portion of the pipe wall, and the flange. A projection that is provided at a predetermined location in the circumferential direction of the section and that is fitted into the overhanging hole of the pipe-side connection port, a cylindrical collar that is fitted outside the fitting body, and a fitting that is fitted onto the fitting body. An annular first seal which is fitted between the collar and the outer surface of the peripheral portion of the pipe-side connection opening in the pipe wall. A member, an annular second seal member interposed between the collar and the joint body, and the first seal member is collared by being screwed into the male screw portion of the joint body and pressing the collar. And a nut body that causes a pressure between the pipe wall and the outer surface of the peripheral portion of the pipe-side connection port.

According to a second aspect of the present invention, in a pipe joint, a cylindrical joint main body is inserted into the pipe-side connection port of a pipe having a pipe-side connection port that is circular in plan view and is formed on a pipe wall. The joint side connection port provided at the tip of the joint body, the male thread portion provided on the outer surface of the tip of the joint body, and the pipe side connection at the pipe wall integrally provided at the base end of the joint body. A flange portion that is overlaid on the inner surface of the peripheral portion of the mouth portion, an uneven surface that is provided on the overlapping surface of the flange portion and the inner surface of the peripheral portion of the pipe-side connection opening portion, and a cylindrical shape that is externally fitted to the joint body. A collar, an annular first seal member that is fitted over the joint body and is interposed between the collar and the outer peripheral surface of the pipe-side connection opening in the pipe wall, the collar, and the joint. An annular second seal member interposed between the main body and the joint body A nut body that is screwed into the male screw part of the above and presses the collar to press the first seal member between the collar and the outer surface of the peripheral portion of the pipe side connection port portion of the pipe wall. .

[0009]

[Action]

 In the pipe joint having the structure according to claim 1, a cylindrical joint main body is inserted into a large-diameter hole portion of the pipe side connection port from the inner passage side of the pipe body so that the protrusion of the flange portion is the pipe side connection port. When the nut body is fitted into the overhanging hole of the joint part and the first seal member and the collar are externally fitted to the joint body in this order and then the nut body is screwed into the male thread portion of the joint body and tightened, the joint body The flange portion is pulled out from the body and overlaps the inner surface of the peripheral portion of the pipe side connection port portion on the pipe wall, and the first sealing member is attached to the collar and the peripheral portion of the pipe side connection port portion on the pipe wall by the tightening force of the nut body. It is pressed against the outer surface. The pipe joint is connected to the pipe body in this state.

When the nut body is tightened, the protruding portion that fits into the overhanging hole portion of the pipe-side connection port engages with the overhanging hole portion to keep the nut body and the joint body together. To prevent .

Further, in the state where the pipe joint is coupled to the pipe body, the overlapping portion of the flange portion and the inner surface of the peripheral portion of the pipe-side connection opening portion, the portion between the joint body and the peripheral portion of the large diameter hole portion The first seal member closes the fluid leakage path formed by the gap formed at the location between the protrusion and the peripheral edge of the overhang hole. The first seal member may be pressed radially between the collar and the outer surface of the peripheral portion of the pipe-side connection opening in the pipe wall to project radially inward and come into pressure contact with the outer surface of the joint body. In this case, the fluid leakage path formed by the gap between the joint body and the collar is also blocked by the first seal member. Further, since the second seal member is interposed between the collar and the joint body, the fluid leakage path formed by the gap between the joint body and the collar is also blocked by the second seal member.

In the pipe joint of the second aspect of the invention, when the nut body is tightened, the concave and convex surface is caught on the outer surface of the peripheral portion of the pipe-side connection port portion, and the joint body is prevented from rotating around.

[0013]

【Example】

 Next, an embodiment of the invention of claim 1 will be described. 1 is a plan view of a pipe joint A used as a branch saddle for a fire hydrant, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG. .

The pipe joint A is provided on a cylindrical joint body 21, a joint-side connection port portion 23 having a taper female thread 22 provided at the tip of the joint body 21, and an outer surface of the tip of the joint body 21. A male screw portion 24, a flange portion 25 integrally provided in the base end portion of the joint body 21 in an annular shape, and projecting portions 26, 26 provided at two positions 180 degrees apart in the circumferential direction of the flange portion 25, A cylindrical collar 27 that can be externally fitted to the joint body 21 with almost no play, a first seal member 28 that is an annular gasket that is externally fitted to the joint body 21, and an annular first ring member that is an O-ring. The second seal member 29 and the nut body 30 that can be screwed into the male screw portion 24 of the joint body 21 are provided.

On the other hand, as shown in FIG. 4, a pipe side connection port 130 is opened in the pipe wall 110 of the pipe body 100 as the main pipe for the fire hydrant. The pipe-side connection port 130 is a circular hole. A large-diameter hole 131 having a circular shape in plan view has a circular arc-shaped plan view that bulges outside the large-diameter hole 131 at two locations 180 degrees apart from each other in the circumferential direction. It has small-diameter overhanging hole portions 132, 132 having a peripheral surface. In the case of forming such a pipe-side connection opening 130, a center drill provided on a hole saw (not shown) is set up at the center O1 of each of the overhanging holes 1 32 shown in FIG. After forming the overhanging holes 132, 132, the center drill may be pierced at the center O2 of the large diameter hole 131 to open the large diameter hole 131. In this way, the pipe can be used without using a special tool. The side connection port 130 can be easily formed.

Even if the joint body 21 has an outer peripheral diameter such that a small gap is generated between the joint body 21 and the hole wall surface 131a of the large diameter hole portion 131 when inserted into the large diameter hole portion 131, Even if the outer peripheral diameter is such that a relatively wide gap is formed between the large-diameter hole portion 131 and the hole wall surface 131a, almost no gap is formed between the large-diameter hole portion 131 and the hole wall surface 131a. However, in the example shown in the figure, the outer diameter is such that there is almost no gap. Further, the projecting portion 26 is provided integrally with the flange portion 25 and the joint body 21 so as to straddle the flange portion 25 and the joint body 21, and its plan view shape is the same as that of the projecting hole portion 132 as seen in FIG. The shape may be an arc shape like this, or another shape such as an angular shape or a shape protruding in a curved shape, but the size is such that it can be fitted into the protruding hole portion 132. I need to be there.

The collar 27 has an annular recess 27a formed on the inner peripheral side of one end surface thereof. Further, an annular groove 27b is formed in the axially intermediate portion of the inner peripheral surface of the collar 27. The first seal member 28 has an outer peripheral diameter that fits in the recess 27a, and has a thickness that partly protrudes from the recess 27a when the recess 27a is fitted. .

In the above, an example of a procedure for connecting the pipe joint A to the pipe body 100 will be described. The joint body 21 is inserted from the inner passage F side of the pipe body 100 into the large-diameter hole portion 131 of the pipe side connection opening portion 130, and the protrusion 26 of the flange portion 25 is protruded from the pipe side connection opening portion 130. When fitted to, the joint body 21 is positioned with respect to the tubular body 100 in the circumferential direction. The first seal member 28 and the collar 27 are fitted to the joint body 21 in this order from the front end side of the joint body 21, or the first seal member 28 is previously fitted to the recess 27a of the collar 27. Then, the first seal member 28 together with the collar 27 is externally fitted to the joint body 21. Next, when the nut body 30 is screwed into the male thread portion 24 of the joint body 21 and tightened, the collar 27 is pressed against the pipe body 100 side through the first seal member 27a, so that the joint body 21 is pulled out from the pipe body 100. The flange portion 25 overlaps with the inner surface of the peripheral portion of the pipe-side connection port portion 130 of the pipe wall 110 (the overlapping portion is indicated by reference symbol a), and moreover, the tightening force of the nut body 30 causes the first seal member 28 is clamped in the recess 27a of the collar 27 between the outer peripheral surface 130a of the pipe-side connection opening 130 and the pipe joint A is joined to the pipe body 100.

In the case of performing such a procedure, when the nut body 30 is tightened, the projecting portion 26 circumferentially engages with the overhanging hole portion 132 of the pipe-side connection port portion 130 so that the nut body 30 and the joint body 21 are connected to each other. Is prevented from servicing. Therefore, even with the pipe joint A in which the joint side connection port portion 23 of the joint main body 21 does not protrude from the nut body 30 screwed into the male screw portion 24, the nut body 30 can be securely tightened.

As shown in FIGS. 2 and 3, when the pipe joint A is connected to the pipe body 100, the overlapping portion a and the flange portion 25 and the inner surface of the peripheral portion of the pipe-side connection port 130 are overlapped. Formed by a gap formed at a portion b between the joint body 21 and the peripheral portion of the large diameter hole portion 131, a portion c between the protruding portion 26 and the peripheral portion of the protruding hole portion 132, and the like. The fluid leakage path is blocked by the first seal member 28. The first seal member 28 is pressed radially between the color 27 and the peripheral surface outer surface 130a of the pipe-side connection port 130, so that the first seal member 28 projects radially inward and comes into pressure contact with the outer surface of the joint body 21. In some cases, the fluid leakage path formed by the gap between the joint body 21 and the collar 27 is also blocked by the first seal member 28. Further, since the second seal member 29 is interposed between the collar 27 and the joint body 21, the fluid leakage path formed by the gap between the joint body 21 and the collar 27 is the second seal member 29. Is also blocked by. Therefore, even if the fluid leakage path formed by the gap between the joint body 21 and the collar 27 is not blocked by the first seal member 28, the second seal member 29 reliably blocks this leakage path. To do.

In this embodiment, when the annular groove 21 a into which the second seal member 29 is fitted is formed on the outer periphery of the joint body 21, the color 27 is positioned on the joint body 21 via the second seal member 29. To be done.

In addition, in this embodiment, the protrusions 26 are provided at two locations in the circumferential direction of the flange portion 25, but even if the projections 26 are provided only at one location in the circumferential direction of the flange portion 25, the nut body 30 is provided. It is possible to prevent the joint body 21 from being rotated when tightened.

Further, as a measure for preventing the joint body 21 from being rotated when the nut body 30 is tightened, as shown in FIG. 5, the outer surface of the peripheral portion of the pipe side connection port portion 130 of the flange portion 25 is The overlapping surface with and may be the concavo-convex surface 25a processed by the knurling, or the overlapping surface may be the concavo-convex surface 25a provided with radial projections as shown in FIG. This is the configuration adopted in the pipe joint according to the embodiment of the invention.

In these cases, when the nut body 30 is tightened, the uneven surface 25a is caught on the outer surface of the peripheral portion of the pipe-side connection port 130, and the joint body 21 is prevented from being rotated. Each of the above-mentioned uneven surfaces 25a may be formed on the entire overlapping surface or may be partially formed. The uneven surface 25a may be provided together with the projecting portion 26 as shown in the drawing, or the projecting portion 26 may be omitted so that the uneven surface 25a alone prevents the rotation. When the protruding portion 26 is omitted, the extension outlet portion 132 of the pipe side connection opening portion 130 of the pipe body 100 is not necessary. The other components such as the collar and the nut body, and the operation of these components are the same as those described in the embodiment of the invention of claim 1, so that detailed description will be omitted to avoid duplication of description. Description is omitted.

[0025]

[Effect of device]

 The pipe joints of the inventions of claims 1 and 2 can be connected to the pipe body by a screwing method, and the joint body does not rotate when tightening the nut body, so an easy and reliable connection can be achieved. It can be done and no welding work is required. Therefore, no welding skills are required, no work is required to remove the plating even when the pipe is plated, and it is possible to reliably connect the pipe joint to the pipe even in a narrow ceiling. Become. Therefore, the pipe joint of the present invention can be suitably used as a branch saddle for fire hydrants. Moreover, it is cheaper than mechanical cheese. The pipe joint of the present invention is not only used as a branch saddle for fire hydrants, but also as a pipe joint for other types of branches.

[Brief description of drawings]

FIG. 1 is used as a branch saddle for a fire hydrant.
FIG. 3 is a plan view of a pipe joint according to an embodiment of the invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a plan view showing a tube-side connection port formed on the tube body.

FIG. 5 is a plan view showing a joint body used in a pipe joint according to an embodiment of the invention of claim 2 and a flange portion integral with the joint body.

FIG. 6 is a plan view showing a joint body used in a pipe joint according to an embodiment of the invention of claim 2 and a flange portion according to a modification integral therewith.

FIG. 7 is a partial cross-sectional view showing a usage state of a conventional example.

[Explanation of symbols]

 A pipe joint 21 joint body 23 joint side connection port 24 male screw part 25 flange part 25a uneven surface 26 protruding part 27 collar 28 first seal member 29 second seal member 30 nut body 100 pipe body 110 pipe wall 130 pipe side connection port Part 130a Peripheral part outer surface of pipe side connection port 131 Large diameter hole part 132 Overhang hole part

Claims (2)

[Scope of utility model registration request] 1. A pipe having a pipe-side connection port formed on a pipe wall at a predetermined position on a peripheral portion of a large-diameter hole having a circular shape in a plan view and having a bulging hole bulging outside the hole. A cylindrical joint body to be inserted into the large-diameter hole portion of the pipe-side connection opening portion of the body, a joint-side connection opening portion provided at the tip portion of the joint body, and an outer surface of the tip portion of the joint body. The external thread portion provided, the flange portion integrally provided at the base end portion of the joint body and overlapped with the inner surface of the peripheral portion of the pipe-side connection opening portion of the pipe wall, and the flange portion provided at a predetermined position in the circumferential direction of the flange portion. A protrusion that is fitted into the overhanging hole portion of the pipe-side connection opening, a cylindrical collar that is fitted outside the joint body, and a collar that is fitted outside the joint body and that is formed on the collar and the pipe wall. An annular first seal member interposed between the pipe-side connection port and the outer surface of the peripheral portion, and the collar An annular second seal member interposed between the joint body and the collar is pressed into the male screw portion of the joint body to press the collar, and the first seal member is connected to the collar and the pipe side connection port in the pipe wall. And a nut body that presses against the outer surface of the peripheral portion of the section, and a pipe joint. 2. A cylindrical joint body to be inserted into the pipe side connection opening portion of a pipe body having a pipe side connection opening portion which is circular in a plan view, and a tip end portion of the joint body. The joint side connection port, the male screw part provided on the outer surface of the tip of the joint body, and the male screw part integrally provided at the base end of the joint body, and overlapped with the inner surface of the peripheral edge of the pipe side connection port in the pipe wall. An uneven surface provided on an overlapping surface of the flange portion and the inner surface of the peripheral portion of the pipe-side connection opening portion of the flange portion, a cylindrical collar externally fitted to the joint body, and an outer surface of the joint body. An annular first seal member fitted and interposed between the collar and the outer peripheral surface of the pipe-side connection opening in the pipe wall, and an annular first seal member interposed between the collar and the joint body. The second seal member and the upper threaded part of the male thread of the joint body Pipe joint characterized in that it comprises a nut body which 挾圧 between the peripheral external surface of the pipe connecting port portion said first seal member in the collar and the pipe wall by pressing the color.