JP2012177482A - Branch joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with not only the case of gas in which a fluid passing through a main pipe is low in pressure but also the case of a high-pressure fluid such as water, in the securement of the seal performance of a resin-made branch joint.SOLUTION: A prescribed range of an opening communicating to the main pipe of a saddle, or a prescribed range of an internal face of a branch cylinder shifted to the main pipe side is a non-formation part of a female screw, the non-formation part of the female screw is formed into a stepped shape by being diameter-contracted in the middle progressing toward the main pipe, a seal plug is constituted so that the end face of the main pipe side is made to abut on a step of the stepped shape at plug-closing, the prescribed range from the end of the main pipe side is a non-formation part of a male screw, a ring-shaped seal packing having a self-seal property is attached to the non-formation part of the male screw, and the seal packing is closely adhered to the non-formation part of the female screw at the plug-closing.

Description

  The present invention relates to a branch joint used for attaching and detaching a branch pipe to a main pipe during fluid transportation without stopping the fluid transportation in the main pipe. In particular, the fluid flowing through the main pipe is at a high pressure. It relates to the thing corresponding to a certain case.

  Regarding the branch joint, there is a joint disclosed in the following Patent Document 1 as a joint having a valve function that can attach and detach the branch pipe without stopping the fluid transportation on the main pipe side.

As shown in FIG. 1 of Patent Document 1, the structure disclosed in Patent Document 1 has a cylindrical seal packing in the seal plug built in the branch cylinder portion as shown in FIG. Is provided. The seal packing has such a cylindrical shape because the part to be sealed is in a wide range from the inner peripheral surface of the branch tube portion near the main pipe to the inner peripheral surface of the opening drilled in the main pipe. Because there is.
Japanese Patent No. 3196016

  However, the one disclosed in Patent Document 1 corresponds to the case where the main fluid is a gas, and cannot be used when the main fluid is a liquid such as water having a pressure higher than that of the gas.

  This is because the magnitude of the sealing force of the cylindrical seal packing is the initial packing surface pressure, that is, the outer diameter of the packing is compressed on the inner peripheral surface near the main tube of the branch cylinder part, and on the inner peripheral surface of the main tube opening that follows. It is because it is only the magnitude of the reaction force of the packing when subjected to the action.

  Therefore, when the pressure of the fluid on the main pipe side increases, it is necessary to increase the packing surface pressure. To that end, the outer diameter of the seal packing is set to the inner peripheral surface near the main pipe of the branch cylinder portion. It is necessary to increase the compression amount of the seal packing by making it considerably larger than the diameter of the inner peripheral surface of the main pipe opening.

  However, when this is done, the torque becomes too large when the seal plug is screwed in, so that the female screw on the inner surface of the branch cylinder portion formed of resin or the screw is engaged with the male screw on the surface of the seal plug also formed of resin. There is a risk of screw threads being crushed.

  Therefore, an object of the present invention is to ensure a seal between the branch joint and the main pipe when the fluid flowing through the main pipe is not a gas such as a gas but a high-pressure fluid such as water. There is.

In order to solve the above problems, the invention according to claim 1 includes a saddle portion that is attached to the tube, is erected on the surface of the saddle portion, and the branched tubular portion which female screw is formed on an inner surface, the A branch pipe connecting portion projecting from a side wall of the branch cylinder portion, and a cylindrical seal plug is formed in the branch cylinder portion by a male screw formed on a peripheral surface of the branch cylinder portion. In the branch joint that is screwed onto the inner part, a predetermined range of the opening of the saddle part leading to the main pipe or the inner surface of the branch cylinder part closer to the main pipe is a non-formed part of the female screw. The non-formed part of the screw is reduced in diameter in the direction toward the main pipe to form a stepped shape, and when sealing, the seal plug has an end face on the main pipe side that is stepped on the stepped shape. A predetermined range from the main pipe side end is a non-formed part of the male screw. A ring-shaped seal packing having a self-sealing property is attached to the non-formed portion of the male screw, and the seal packing is brought into close contact with the non-formed portion of the female screw at the time of closing. Was adopted.

  By doing so, the seal at the time of closing the main pipe side is performed at the opening of the saddle part above the opening drilled in the main pipe or the inner peripheral surface of the branch cylinder part, and the opening drilled in the main pipe It is not done in the position.

Then, the ring-shaped seal packing is pressed against the inner surface of the opening that penetrates the saddle portion and the main pipe, and is in a watertight state. This is because the ring-shaped seal packing has a self-sealing property that even if the initial surface pressure is small, the ring-shaped seal packing can be greatly deformed and sealed in a watertight manner when the pressure becomes high.

  Further, since the seal area is small, the force for generating the initial surface pressure is small, and the screwing torque of the seal plug is small.

According to a second aspect of the present invention, there is provided a saddle portion mounted on the main pipe, a branch cylinder portion standing on the surface of the saddle portion and having an internal thread formed on the inner surface thereof, and protruding from a side wall of the branch cylinder portion A cylindrical seal plug is screwed onto the female screw on the inner surface of the branch cylinder with a male screw formed on the peripheral surface thereof. In the branch joint, an opening leading to the main pipe of the saddle section or an inner surface closer to the main pipe of the branch cylinder section is reduced in diameter in the direction toward the main pipe to form a stepped shape, A ring-shaped or disk-shaped seal packing having a self-sealing property is fixed to an end surface on the main pipe side of the seal plug, and the seal packing is in close contact with the stepped shape step portion when closing. The structure which becomes is adopted.

Even in such a case, as in the case of the invention according to claim 1 , the seal at the time of closing the main pipe side is the opening of the saddle portion above the opening drilled in the main pipe or the inner peripheral surface of the branch cylinder portion. Yes, not at the position of the opening drilled in the main.

According to a third aspect of the present invention, in the branch joint according to the first or second aspect , the inner surface of the branch cylindrical portion is a non-formed portion of the female screw over a predetermined range from the end portion. A circumferential groove is formed in the non-formed part of the screw, and when sealing, a ring-shaped second seal packing having a self-sealing property is attached to the circumferential groove, and the seal plug is attached to the second seal packing. This is a configuration in which the end opposite to the main pipe is in close contact.

  If it does in that way, the branch cylinder part edge part side will be sealed watertight between the 2nd seal packing and the edge part on the opposite side to the main pipe of the said seal plug.

According to a fourth aspect of the present invention, in the branch joint according to any one of the first to third aspects, the seal packing having a “cylindrical surface” on the inner surface of the top plate of the seal cap that is screwed onto the outer surface of the branch cylinder portion. The body has a cylindrical surface concentric with the axis of the branch cylinder portion and is rotatably held around the axis, and a circumferential groove is formed in the cylindrical surface. A ring-shaped third seal packing having a sealing property is slidably held, and the inner surface of the branching cylinder part has a predetermined range from the end part as a non-forming part of the female screw, When the seal cap is screwed, a configuration is adopted in which the seal packing is brought into close contact with the non-formed portion of the female screw.

  Even if it does so, the branch cylinder part edge part side is sealed watertight between the non-formation part of the internal thread of the inner surface, and the 3rd seal packing. In addition, the "holding body having a cylindrical surface" does not mean that the holding body is limited to a "hollow cylinder", but may be a "solid column" as in the embodiments described later. This means that the peripheral surface forms a “cylindrical curved surface”.

Since the invention of the branch joint according to claims 1 and 2 adopts the above-described configuration, a highly water-tight seal is possible even for a pipe line having a high fluid pressure such as a water pipe. Branch joints can be supplied.

  Sealing at the time of main side plugging is performed on the opening of the saddle part above the opening drilled in the main pipe and the inner peripheral surface of the branch cylinder part, and is performed at the position of the opening drilled in the main pipe. Therefore, even if the hole drilled in the main pipe is inclined, the drilling work on the main pipe can be performed with a margin regardless of the sealing performance.

In the invention of the branch joint with claim 3 according to claim 4, it branched tubular portion end side is sealed watertight, there is an effect that, among this, for claim 3, the seal cap branched tubular portion end In this case, there is an effect that the water pressure from the branch cylinder portion is not applied to the seal cap.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 shows a branch joint A of the present embodiment with a partial cross-section. The branch joint A includes a saddle portion 1 mounted on the main pipe 100, a branch cylinder portion 2 standing on the surface of the saddle portion 1, and a branch projecting from the side wall of the branch cylinder portion 2. A seal plug 20 for sealing is incorporated in the branch tube portion 2 of the branch joint body 10 composed of the pipe connection portion 3. FIG. 1 shows a double seal by sealing with the seal plug 20 and further applying a seal cap 200. In the figure, the reference numeral 300 indicates a branch pipe.

  2 is a cross-sectional view of the branch joint body 10 in which the seal cap 200 and the seal plug 20 are removed from the branch joint A of FIG. 1, FIG. 3A is a plan view of the seal plug 20 alone, and FIG. It is sectional drawing of the plug 20 single-piece | unit. Hereinafter, the end face shown in FIG. 3A is also referred to as the upper end face, and the opposite main pipe side end face is also referred to as the lower end face. The corresponding portions of the branch cylinder portion 2 in which the seal plug 20 is built are also shown in FIG. The upper side is called the upper end, and the lower side is called the lower end. The lower end side is also called the main pipe side. Furthermore, FIG. 3 is the elements on larger scale which showed the seal | sticker form in this embodiment.

  The branch joint body 10 of the present embodiment is an EF (Elektro Fusion) saddle type made of polyethylene resin. As shown in FIG. 2, the branch joint body 10 is already installed in the saddle portion 1 in which a heating wire (not shown) is built. The main pipe 100 is fixed to the surface of the main pipe 100 by heat fusion.

  The inner peripheral surface of the branch cylinder portion 2 is a straight surface 4 having a diameter of 28 mm in a range of 7 mm downward from the upper end, and a peripheral groove 5 having a depth of 2 mm is provided in the middle of the straight surface 4. An O-ring 6 is attached to the circumferential groove 5 in a seal cap attaching step (see FIGS. 7A and 7B) described later.

  From the end point of the straight surface 4 to the lower end side, a female screw 7 of M28 is formed to a depth that bites into the saddle portion 1. From the end point of the female screw 7, the remaining thickness of the saddle portion 1 and the thickness of the main pipe 100 are formed. An opening 8 having a diameter smaller than the diameter of the female screw 7 is formed. The inner peripheral surface of the opening 8 is a straight surface over the entire range, and nothing is formed there.

  A cylindrical seal plug 20 shown in FIGS. 3 (a) and 3 (b) is mounted on the inner peripheral surface of the above-described branch cylinder portion 2. The seal plug 20 is formed of a polyvinyl chloride resin. . As shown in the figure, the seal plug 20 has a straight surface 21 with an outer diameter of 26 mm in the peripheral surface in a range of 7 mm downward from the upper end side of the cylinder, and nothing is formed there. A male screw 22 of M28 that is screwed into the female screw 7 on the inner peripheral surface of the branch cylinder part 2 is formed from the end point of the straight surface 21 toward the lower end side. The peripheral surface from the end point of the male screw 22 forming portion to the lower end is again a straight surface 23 having a diameter of 22.7 mm, and a peripheral groove 24 is provided near the lower end of the straight surface 23. The circumferential groove 24 has a depth of 2.35 mm and a width of 5 mm. An O-ring 25 having an inner diameter of 15.47 mm and a wire diameter of 3.53 mm is attached to the circumferential groove 24.

  Further, in order to attach the seal plug 20 to the branch cylinder portion 2, as shown in FIGS. 3A and 3B, a lid 26 for attaching a jig (T-type wrench) to the upper surface thereof. Are integrated with an adhesive. An engagement hole 27 is formed on the upper surface of the lid 26 of the seal plug, as shown in FIG.

  The above is the configuration of the branch joint body 10 and the seal plug 20 attached thereto in the first embodiment. This seal plug 20 is used in the main pipe 100 closing process of the main pipe 100 described later. As shown in FIG. 4, the O-ring 25 near the lower end of the seal plug 20 comes into close contact with the inner peripheral surface of the opening 8 that penetrates the main pipe 100.

  The O-ring 25 has a self-sealing property that even if the initial surface pressure is small, the O-ring 25 is greatly deformed and can be sealed watertight, and the fluid flowing through the main pipe 100 is a high-pressure liquid such as water. It is possible to cope with this case.

  Next, the construction procedure for plugging the main pipe 100 and the installation procedure for the branch pipe connecting portion 3 will be described with reference to the drawings. First, the installation procedure of the branch pipe connection part 3 is demonstrated. 5 (a) to 5 (c) show the step of drilling the opening 8 leading from the branch tube portion 2 to the main pipe 100, FIGS. 6 (a) to 6 (c) show the step of attaching the seal plug 20, and FIG. a) shows one process of attaching the seal cap 200, and FIG. 7 (b) shows the process following (a) in detail in an enlarged cross-sectional view. Initially, with reference to FIG. 5 (a)-(c), the perforation process of the opening 8 which leads to the main pipe 100 from the branch cylinder part 2 is demonstrated. In FIG. 5 to FIG. 8 and FIG. 1 described above, the water colored in gray and provided with the symbol W is water flowing through the main pipe 100 and the branch joint body 10.

  First, as shown in FIG. 5 (a), the saddle portion 1 of the branch joint body 10 having the branch pipe connecting portion 3 protruding from the branch cylinder portion 2 is heat-sealed to the main pipe 100, and then the branch cylinder portion. 2 sets the drilling jig 30. The drilling jig 30 is a set of a work tube 32 attached with a cock 31 for blocking the water flow, a water-tight forcible 33 for drilling, or a T-wrench 35 (see FIG. 5) described later. The lower end of the working tube 32 is engaged with the upper end of the branch cylinder portion 2.

  Next, with the cock 31 in the “open” state, as shown in FIG. 5 (b), the shaft 34 of the horusoe 33 is operated to lower the horusoe 33, and the main pipe 100 is drilled to open the opening 8. Form. In the first embodiment, the outer diameter of the hole saw 33 was 24.2 mm, and the hole diameter of the opening 8 to be drilled was 22.84 to 23.13 mm.

  When the hole drilling by the hole saw 33 is completed, as shown in FIG. 5C, the hole saw 33 is moved above the cock 31 to bring the cock 31 into a “closed” state. And although not shown in figure, the hole saw 33 is completely extracted from the branch cylinder part 2. FIG. The above is the step of drilling the opening 8 from the branch tube portion 2 into the main pipe 100. At this stage, the water W in the main pipe 100 flows into the branch pipe connecting portion 3 and the branch pipe 300 side. Next, the process of attaching the seal plug 20 will be described with reference to FIGS.

  First, as shown in FIG. 6 (a), a T-type wrench is inserted into the engagement hole (27, not denoted by reference numeral in FIG. 6 (a)) on the upper surface of the seal plug lid 26 at the upper end of the seal plug 20 described above. The tip of 35 is engaged, and the seal plug 20 in this state is put into the working tube 32 of the above-described drilling jig 30 attached to the branch cylinder portion 2. This completes the temporary setting of the seal plug 20. At this time, the cock 31 in the working tube 32 remains closed.

  Next, as shown in FIG. 6B, the cock 31 is opened, and the T-type wrench 35 is operated to lower the seal plug 20. The seal plug 20 has a male screw 22 formed on the peripheral surface thereof screwed into a female screw 7 formed on the inner peripheral surface of the branch cylinder portion 2 and is sent to the main pipe 100 side by the screw action. The seal plug 20 is lowered until the straight surface 21 on the upper end side is slightly past the circumferential groove 5 in which the O-ring 6 on the upper end of the branch cylinder portion 2 is mounted.

  Thus, when the mounting of the seal plug 20 is completed, the drilling jig 30 is completely removed from the branch tube portion 2 as shown in FIG. At this time, the water W in the main pipe 100 is transmitted through the threaded portions of the seal plug 20 and the screws 7 and 22 on the inner periphery of the branch cylinder portion 2 and slightly leaks from the tip of the seal plug 20 to the outside of the branch tube portion 2. This is not to the extent that it will affect the installation work of the next seal cap. Next, a process of attaching the seal cap 200 as a double seal for safety will be described with reference to FIGS. 7 (a) and 7 (b).

  First, as shown in FIG. 7A, an O-ring 6 is attached to a circumferential groove 5 formed on the straight surface 4 near the upper end of the inner periphery of the branch tube portion 2. Subsequently, the seal plug 20 is pulled up by the T-type wrench 35 so that the straight surface 21 near the upper end of the seal plug 20 and the O-ring 6 near the upper end of the branch cylinder portion 2 are in close contact with each other.

Thus, as shown in FIG. 7 (b), the straight surface 21 near the upper end of the seal plug 20 and the straight surface 4 near the upper end of the branch tube portion 2 are sealed via the O-ring 6. Since the sealing area is small, when the pressure becomes high, it is greatly deformed and sealed in a watertight manner, and the water W of the main pipe 100 does not leak outside from the upper end of the branch cylinder portion 2. Therefore, when the seal cap is attached, the seal cap 200 can be easily attached because the water pressure is not received from the branch tube portion 2 side. This configuration corresponds to the invention according to claim 3 of the present application.

Further, it is also effective to adopt the following configuration as the seal at the end of the branched tube portion. This corresponds to the invention according to claim 4 , and the feature thereof is the structure of the seal cap. The structure of the seal cap is shown in FIG. 8, and the state in which the seal cap is mounted is shown in a sectional view in FIG.

  FIG. 8A is a perspective view of the seal cap 400 and the seal packing holder 410 mounted inside the cylinder. However, the seal cap 400 is drawn upside down and in a half cross section so that the inside of the seal cap 400 can be visually recognized. On the other hand, the seal packing holder 410 is drawn with the vertical direction as it is. Also here, the seal packing used is an O-ring 411 having self-sealing properties. Hereinafter, the seal packing holder 410 is referred to as an O-ring holder 410.

  As shown in FIG. 8, a circumferential groove 402 for mounting an O-ring that seals the end surface of the branch cylinder part is formed inside the seal cap 400 inside the female screw 401 for screwing into the branch cylinder part. ing. This is the same as the seal cap 200 of FIG. A ring-shaped protrusion 403 having a predetermined width and a predetermined height is provided on the inner side of the peripheral groove 402 so as to be concentric with the peripheral groove 402. The ridge 403 is depicted as projecting upward in the drawing, but when the seal cap 400 is used, it is projected from the inner surface of the top plate downward.

  A portion having a predetermined thickness protrudes inward from the upper surface inside the end portion of the protrusion 403 with the same dimension over the entire circumference, and the protruding portion engages with the O-ring holding body 410. Part 404.

  As shown in FIG. 8, the O-ring holder 410 has an engaging portion 413 that engages with the engaging portion 404 inside the seal cap 400 on the upper surface of the basic cylinder 412. The engaging portion 413 is a portion in which a portion having a predetermined thickness protrudes outward with the same dimension from the upper surface of the upper end portion of the cylindrical peripheral wall protruding from the upper surface of the basic column 412.

  A circumferential groove 414 is formed on the circumferential surface of the basic cylinder 412 of the O-ring holder 410, and an O-ring 411 is attached to the circumferential groove 414.

  FIG. 8B is a cross-sectional view showing a state in which the O-ring holding body 410 having the above-described configuration is mounted on the seal cap 400. As shown in the drawing, the O-ring holder 410 is engaged with the engaging portion 404 on the top plate inner surface of the seal cap 400 by the engaging portion 413, and rotates around the cylinder axis with respect to the seal cap 400. It is designed to hang freely. FIG. 9 shows a state in which the seal cap 400 in which the O-ring holding body 410 is rotatably held in this manner is screwed to the branch cylinder portion 501 of the branch cylinder main body 500.

  As shown in FIG. 9, in this case as well, the inner surface near the end of the branch tube portion 501 is the female screw non-formation portion 505, but of course, the O-ring is not attached to this time this time. First, the O-ring 411 attached to the O-ring holder 410 is in close contact with the O-ring holder 410 and seals.

  Although not related to the configuration described above, an inverted frustoconical shape 415 extends on the lower surface of the basic cylinder 412 of the O-ring holder 410, and this portion is provided on the upper surface of the seal plug 510. It fits into the engaging hole 513 of the wrench for rotation, and is shaped to fulfill the role of its lid.

  The above is an explanation of the construction method for distributing the water W between the main pipe 100 and the branch pipe connection part 3 without stopping the flow of the water W in the main pipe 100. Next, For some reason, for example, when the branch pipe 300 is repaired, it is necessary to block the flow of water W between the main pipe 100 and the branch pipe connecting portion 3, and the “closure” procedure for the main pipe 100 is performed. Will be described with reference to FIGS.

  First, as shown in FIG. 10A, the seal cap 200 that has been in the double seal state is removed, and the seal plug 20 is screwed into the main pipe 100 again with a jig.

  As shown in FIG. 10 (b), the seal plug 20 is screwed in such a manner that the O-ring 25 mounted near the lower end of the seal plug 20 penetrates into the main pipe 100 through the thickness of the saddle portion 1 and the main pipe 100. This is done until the bottom end of the opening 8 is reached.

  Thus, as shown in FIG. 4, the seal between the peripheral surface near the lower end of the seal plug 20 and the inner peripheral surface of the opening 8 is performed via the O-ring 25. There is no flow from the main pipe 100 to the branch cylinder part 2 and the branch pipe connection part 3 side. Since the O-ring 25 has a small sealing area, the force for generating the initial surface pressure is small, and the O-ring 25 has a self-sealing property that it can be greatly deformed and sealed in a watertight manner when the pressure becomes high. This is because it is possible to cope with the case where the fluid flowing through the liquid is a high-pressure liquid such as water.

  After that, the branch pipe 300 is repaired in that state. At that time, FIG. 10 (c) shows the state of the double seal with the seal cap 200 attached, but the sealing function at the lower end of the seal plug 20 of the present invention is as described many times until now. Since it is performed by the O-ring 25 having a strong sealing property, there is basically no need to take the form of a double seal.

(Second embodiment)
Next, a second embodiment of the present invention will be described. FIG. 11 is a cross-sectional view of the branch joint main body 70 of the second embodiment, FIG. 12A is a plan view showing an upper end surface of a single seal plug 60 built in the branch cylindrical portion 52, and FIG. b) is a sectional view of the seal plug 60 alone.
Hereinafter, as in the case of the first embodiment, the end face shown in FIG. 12A is also referred to as an upper end face, and the opposite end face on the main pipe 100 side is also referred to as a lower end face. The corresponding portions of the branch cylinder portion 52 are also referred to as an upper end side and a lower end side (main pipe 100 side). FIG. 11A is a partially enlarged view showing a seal form in the present embodiment, and FIG. 11B is a partially enlarged view showing another example of the seal form.

  The branch joint main body 70 of the second embodiment is also formed of polyethylene resin, and as shown in FIG. 11, the branch cylinder portion 52 having the saddle portion 51 is the surface of the existing main pipe 100 at the saddle portion 51. It is fixed by heat fusion. A branch pipe connecting portion 53 projects from the side wall of the branch cylinder portion 52.

  The inner peripheral surface of the branch cylinder portion 52 is a straight surface 54 having a diameter of 28 mm in a range of 7 mm downward from the upper end, and a circumferential groove 55 having a depth of 2 mm is provided in the middle of the straight surface 54. An O-ring 56 is attached to the circumferential groove 55. From the end point of the straight surface 54, a female screw 57 of M28 is formed to the middle of the thickness of the saddle portion 51. An opening 58 having a diameter of 17.8 to 18.1 mm smaller than the mountain diameter of the female screw 57 is formed through the remaining thickness of the saddle portion 51 and the thickness of the main pipe 100 from the end point of the female screw 57. Has been. The opening 58 was perforated with a water-tight hole saw having an outer diameter of 19.2 mm. The inner peripheral surface of the opening 58 is a straight surface, and nothing such as a peripheral groove is formed there.

  On the other hand, the seal plug 60 attached to the branch cylinder portion 52 is also made of polyvinyl chloride resin, as in the first embodiment, and the seal plug 60 is a circular shape as shown in FIG. It has a columnar shape, and a range of 7 mm downward from the upper end thereof is a straight surface 61 having a diameter of 26 mm. Nothing is formed on the straight surface 61.

  From the end point of the straight surface 61 toward the lower end, an M28 male screw 62 that is screwed into the female screw 57 on the inner peripheral surface of the branch cylinder portion 52 is formed. A groove 64 having a width of 2.7 mm and a depth of 1 mm is formed on the lower end surface along the circumference of the seal plug around the periphery of the cylinder axis. The groove 64 has an outer diameter of 24.5 mm. A “ring-shaped” seal packing 65 having a ring shape with a width of 1.5 mm and a height of 1.5 mm is bonded to the parallel portion of the ring-shaped portion by applying an adhesive. When no force is applied to the ring-shaped seal packing 65, the lower end of the cross section of the ring-shaped seal packing 65 protrudes from the lower end surface of the seal plug 60.

  Further, as in the case of the first embodiment, a lid 66 is fixed and integrated with an adhesive on the upper end side, and the upper surface of the lid 66 is integrated with an upper surface as shown in FIG. An engagement hole 67 in which the tip shape of the T-type wrench can be engaged is formed. The above is the configuration of the branch joint main body 50 and the seal plug 60 attached thereto in the second embodiment.

  The second embodiment also performs the installation process of the branch pipe 300 shown in FIGS. 5 to 7 of the first embodiment and the plugging process of the main pipe 100 shown in FIG. Are exactly the same, and the description of those construction methods is omitted. A characteristic feature of the second embodiment is the “sealing configuration” at the time of “closure” for blocking the flow of water between the main pipe 100 and the branch pipe connecting portion 53, which is made in the opening 58 penetrating the main pipe 100. Is. Hereinafter, the “seal form” of the second embodiment will be described.

  The “closure” of the present embodiment is based on the ring-shaped seal packing 65 having a “kamaboko-shaped” cross section that is fixed to the lower end surface of the seal plug 60. When the seal plug 60 is screwed into the main pipe 100 as shown in FIGS. 10A and 10B of the first embodiment for closing, the ring-shaped seal packing 65 is changed to FIG. As shown to a), it presses against the said plane part 59 of the opening 58 periphery formed in the saddle part 51, and it will be in a watertight state. This is because the ring-shaped seal packing 65 has a self-sealing property that when the seal area is small and the pressure becomes high, the ring-shaped seal packing 65 is greatly deformed by the pressure and seals in a watertight manner.

  Further, since the ring-shaped seal packing 65 has a small seal area, the force for generating the initial surface pressure is small, and the screwing torque of the seal plug 60 is also small. Therefore, there is no possibility that the threads of the screws 57 and 62 formed in the seal plug 60 and the branch cylinder portion 52 are crushed.

  In the second embodiment, a ring-shaped seal packing 65 having a “kamaboko” cross section is used, but an O-ring having a self-sealing property may also be used.

  Further, the seal plug 60 shown in FIGS. 12 (a) and 12 (b) and the ring-shaped seal packing 65 attached to the seal plug 60 are not configured as shown in FIG. 13 (b). A structure in which a disk-like seal packing 72 is fixed to the lower end surface 71 of the seal plug 70 formed into a surface with an adhesive may be used.

  The disc-shaped seal packing 72 is also pressed against the stepped flat portion 59 at the edge of the female screw 57 forming portion of the branch tube portion 52, unlike the ring-shaped seal packing as in the conventional example. When sealed, it will seal tightly. This is because such a disc-shaped seal packing 72 also has a seal area that is significantly smaller than that of a cylindrical one, so that it is possible to reduce the force for generating the initial surface pressure. This is because it has a self-sealing property that it is greatly deformed and sealed in a watertight manner.

  As described above, the upper end side of the branch cylinder portion 52 adopts the same seal form as that of the first embodiment, and FIG. 9 (b) showing the attaching process of the seal cap 200 of the first embodiment. ) Is attached with reference numerals in parentheses, and the seal form on the upper end side of the branch cylinder part 52 in the second embodiment is shown. That is, the straight surface 54 on the upper end side of the branch cylinder portion 52 and the straight surface 61 on the upper end side of the seal plug 60 are watertight via the O-ring 56 attached to the circumferential groove 55 of the straight surface 54 of the branch cylinder portion 52. It is designed to be sealed.

  Therefore, the water on the main pipe 100 side does not jet out of the branch cylinder portion 52 from this seal portion. Even in the second embodiment, when the double seal is performed with the seal cap 200, the seal cap The water pressure on the main pipe 100 side is not applied to 200, and there is no possibility that the screw thread is crushed.

  Moreover, although the polyethylene resin was used as the resin material of the branch joint main body 50 and the polyvinyl chloride resin was used as the resin material of the seal plug, other synthetic resins can be used.

  Further, in each of the above embodiments, specific dimensions are shown for the dimensions of each part of the branch joint body 10 (50) and the construction jig, but it goes without saying that these dimensions are not limited to those described above.

(Third embodiment)
The third embodiment corresponds to the invention according to claim 3. 14 is a cross-sectional view of the branch joint main body 80 of the third embodiment, FIG. 15A is a cross-sectional view of a single unit of the seal plug 90 built in the branch cylindrical portion 82, and FIG. FIG. 15C is a partially enlarged view showing a seal form at the time of main pipe closing in the present embodiment, and FIG. Hereinafter, as in both the above embodiments, the end face shown in FIG. 15A is also referred to as the upper end face of the seal plug, and the opposite end face on the main pipe 100 side is also referred to as the lower end face. The corresponding portions of the branch cylinder portion 82 are also referred to as the upper end side and the lower end side (or the main pipe 100 side).

  The branch joint body 80 of the third embodiment is also made of polyethylene resin, and as shown in FIG. 14, a branch cylinder portion 82 having a saddle portion 81 is the surface of the existing main pipe 100 at the saddle portion 81. It is fixed by heat fusion. A branch pipe connecting portion 83 projects from the side wall of the branch cylinder portion 82.

  The inner peripheral surface of the branch cylinder portion 82 is a straight surface 84 over a predetermined range near the upper end, and a circumferential groove 85 is formed in the middle of the straight surface 84. A ring-shaped seal packing 86 having a rectangular cross section is attached to the circumferential groove 85.

  Further, an M28 female screw 87 is formed in a predetermined range from the end point of the straight surface 84 toward the lower end. A section from the end point of the female screw 87 to the surface of the main pipe 100 is smaller than the diameter of the female screw 87, and the branch cylinder portion 82 is formed at the end of the female screw 87 forming portion. A stepped flat portion 88 perpendicular to the tube axis is present.

  The main pipe 100 is formed with an opening 89 penetrating the wall thickness, and nothing such as a circumferential groove is formed there.

  On the other hand, the seal plug 90 shown in FIG. 15A attached to the branch cylinder portion 82 is entirely formed of a metal such as stainless steel or brass, has a cylindrical shape, and extends downward from the upper end of the peripheral surface. An M28 male screw 91 that is screwed into the female screw 87 on the inner peripheral surface of the branch cylinder portion 82 is formed in a predetermined range.

  The upper end surface is provided with an engagement hole 92 in which a tip of a T-wrench for screwing into the branch tube portion 82 of the seal plug 90 can be engaged.

  A circumferential groove 93 is provided adjacent to the end of the formation part of the male screw 91, and an O-ring 94 is attached to the circumferential groove 93.

  The most important feature of the seal plug 90 of this embodiment is that all peripheral surfaces from the mounting position of the O-ring 94 to the lower end are cutting edges 95 for punching the opening 89 in the main pipe 100. This is a “cutting blade integrated type” seal plug 90. That is, the seal plug 90 also serves as a horusoe.

  Since the seal plug 90 according to the present embodiment alone also serves as a hole saw in this way, the “drilling step” and the “seal plug attachment step” of the present embodiment are the same as those in the first and second embodiments (hereinafter referred to as the first embodiment). The “drilling process” shown in FIGS. 5A to 5C in FIG. 5A and the “seal plug attaching process” shown in FIGS. 6A to 6C are different. Hereinafter, these steps in the third embodiment will be described with reference to FIGS. 5 (a) to 5 (c) and FIGS. 6 (a) to 6 (c).

  First, in the “drilling step” of the first embodiment, the saddle portion 1 of the branch joint main body 10 is heat-sealed to the main pipe 100 and then the branch cylinder portion 2 is shown in FIG. The drilling jig 30 was set. The drilling jig 30 includes an open / close valve (cock 31) inside, a working tube 32 that is attached to the branch cylinder portion 2, a T-type wrench 35 for rotating the hole saw 33 and the seal plug 20, and the like. In this embodiment, first, such a drilling jig is not required. In the present embodiment, a male screw 91 that is screwed into a female screw 87 on the inner surface of the branching cylinder part 82 is provided on the peripheral surface of the upper end side of the seal plug 90 that is a horusor, It is because it can move. That is, all that is required in this embodiment is a T-type wrench for rotating the seal plug 90.

  5B of the first embodiment shown in FIG. 5B, in the present embodiment, the end of the T-wrench is inserted into the engagement hole 92 on the upper end surface of the seal plug 90 in the present embodiment. The seal plug 90 is lowered along the female screw 87 of the branch pipe portion 82, and an opening 89 is drilled in the wall surface of the main pipe 100 by the cutting edge 95 on the lower end side.

  In the drilling operation of the main pipe 100, the lowering limit of the seal plug 90, which is a horusoe, is such that the stepped flat portion 96 at the main side edge of the male screw 91 forming portion formed on the peripheral surface of the seal plug 90 is the branch cylinder. This is performed until the step 82 comes into contact with the stepped flat portion 88 at the edge of the female screw 87 forming portion on the inner peripheral surface of the portion 82. In the present embodiment, the seal plug 90 has the lower end of the seal plug 90, that is, the lower end of the cutting blade 95, penetrates the wall of the main pipe 100 when the positional relationship between the seal plug 90 and the branch cylinder portion 82 is as described above. The dimensions and shapes are as follows.

  When the drilling is completed, in the first embodiment, in order to replace the hole saw 33 and the seal plug 20, as shown in FIG. 5C, first, the hole saw 33 is moved above the cock 31, and then, While the cock 31 is in the “closed” state, the hole saw 33 has been completely removed from the branch cylinder part 2 for insertion of the seal plug 20. In the present embodiment, the seal plug 90 has already been removed from the branch cylinder part 82. Since it is mounted in the inside, not only the extraction process of the hole saw 33 shown in FIG. 5C is unnecessary, but also the following steps shown in FIGS. 6A to 6C of the first embodiment. The step of attaching the seal plug 20 can also be omitted.

  That is, in the first embodiment, as shown in FIG. 6 (a), the seal plug 20 is set on the T-type wrench 35, and the seal plug 20 is temporarily set, as shown in FIG. 6 (b). After opening the cock 31, the T-type wrench 35 is operated to lower the seal plug 20, but the seal plug 90 of this embodiment in which the cutting blade 95 is integrated is already in the drilling step described above. Since the seal plug 90 is mounted in the branch cylinder portion 82, the steps of FIGS. 6A and 6B can be omitted. This leads to a marked improvement in work efficiency in the construction of branch pipes and simplification of work jigs.

  In the “cutting blade integrated type” seal plug 90 of the third embodiment, the cutting blade 95 is formed on the peripheral surface from the mounting position of the O-ring 94 to the lower end face. This form is also possible. For example, like the seal plug 60 shown in FIG. 10B of the second embodiment, when the ring-shaped seal packing 65 is fixed to the lower end surface of the seal plug 60, the cutting blade 95 is It is also possible to adopt a shape formed in the region inside the seal packing 65 on the lower end surface of the seal plug 60.

  In this case, in order for the cutting edge 95 to completely pierce the opening 89 penetrating the main pipe 100, the step flat portion 59 at the edge of the forming portion of the female screw 57 of the branch cylinder portion 52 with which the seal packing 65 abuts. A cutting blade 95 having a length longer than the distance between the inner periphery of the main pipe 100 (see FIG. 13) needs to be formed on the lower end surface of the seal plug 90.

  Next, FIG. 15 (b) and FIG. 15 (c) show the “seal form” at the time of “closure” of the main pipe 100 in this third embodiment and the seal form on the upper end side of the branch cylinder part 82. The description will be given with reference. First, the “seal configuration” when the main pipe 100 is “capped” will be described with reference to FIG.

  As in the case of the first embodiment, the seal at the time of “capping” of the present embodiment, that is, the seal between the inner surface of the branch cylinder portion 82 and the peripheral surface of the seal plug 90 is also as shown in FIG. The seal plug 90 is performed through an O-ring 94 mounted in a circumferential groove 93 between a portion of the cutting blade 95 on the main pipe 100 side of the seal plug 90 and a formation portion of the male screw 91 on the upper end side. As described above, the O-ring 94 has a self-sealing property that even if the initial surface pressure is small, the O-ring 94 is greatly deformed and can be sealed in a water-tight manner, and flows through the main pipe 100. This is because it is possible to cope with a case where the fluid is a high-pressure liquid such as water.

  Next, a seal configuration on the upper end side of the branch cylinder portion 82 will be described with reference to FIG. As described above, the circumferential groove 85 is formed in the straight surface 84 on the upper end side of the branch cylinder portion 82, and the ring-shaped seal packing 86 having a rectangular cross section is attached to the circumferential groove. The inner peripheral edge of the seal packing 86 has a diameter smaller than the diameter of the female screw 87 formed on the inner surface of the branch cylinder portion 82, and the inner peripheral edge portion protrudes toward the axial center side of the branch cylinder portion 82. It has become a shape.

Subsequently, the seal plug 20 is pulled up by the T-type wrench 35, and the peripheral edge of the upper end surface of the seal plug 90 and the bottom surface of the inner peripheral edge of the seal packing 86 are brought into close contact with each other to seal the portion in a watertight manner. The state of FIG. 15C also corresponds to claim 3 of the present application as in the case of FIG. 7B of the first embodiment.

  Accordingly, the water W on the main pipe 100 side does not jet out of the branch cylinder portion 82 from this seal portion. Even in the third embodiment, when the double seal is performed with the seal cap 200, the seal W The cap 200 is not subjected to water pressure on the main pipe 100 side, and there is no possibility that the screw thread will be crushed.

(Fourth embodiment)
The fourth embodiment corresponds to the invention of claim 1. FIG. 16A shows a branch joint body 500 of the fourth embodiment in a sectional view, and FIG. 16B shows a seal plug 510 in a half sectional view. (C) is a top view of (b).

  First, as shown in FIG. 16A, the branch joint main body 500 of the present embodiment has a female screw on its inner surface from a predetermined position near the main pipe 100 of the branch cylinder portion 501 toward the main pipe 100 side. A non-forming portion 502 is formed. At the same time, the non-formed portion 502 of the female screw is reduced in diameter on the way to the main pipe 100 side to form a stepped shape. The stepped portion is denoted by reference numeral 503, and the large diameter portion is denoted by reference numeral 504.

  On the other hand, as shown in FIG. 16B, the seal plug 510 of the present embodiment has a male screw non-forming portion 511 in a predetermined range from the main tube 100 side end portion (lower end). A reference numeral 512 is attached to the upper male screw portion. As shown in FIG. 16C, a hexagon hole 513 for engaging a hexagon wrench for rotating the seal plug 510 is provided on the upper surface of the male screw portion 512.

  The male thread non-forming part 511 has an outer diameter slightly smaller than the diameter of the stepped large diameter part 504 of the branch cylinder part 501, and a circumferential groove 514 is formed on the peripheral surface thereof. It is provided. An O-ring 515 is attached to the circumferential groove 514.

  Furthermore, when the sealing plug 510 is moved to the main pipe 100 side when the male thread non-forming portion 511 is closed, the lower end surface 516 of the stepped portion of the branch cylindrical portion 501 is the stepped shape. It abuts against 503 to prevent further movement (see FIG. 17). That is, the male screw non-forming portion 511 to which the O-ring 515 is attached does not reach the opening 8 drilled in the main pipe 100.

  Therefore, when the main pipe 100 side is closed by the configuration of the present embodiment, as shown in FIG. 17, the female screw non-forming part 502 of the branch cylinder part 501 in front of the opening 8 drilled in the main pipe 100 is provided. Since the peripheral surface is sealed in the middle (the large-diameter portion 504), even if the opening 8 is inclined and drilled when the main pipe 100 is drilled, the sealing performance (watertightness) is not affected. .

  Finally, in each of the above embodiments, the EF joint is used as the saddle type joint. However, the saddle type is not limited to this, and a mechanical type joint that can be attached to the main pipe by tightening bolts and nuts can also be used. It is.

  The present invention is widely applicable to branch joints in the case where the fluid flowing through the main pipe is not only a gas having a low pressure such as gas but also a liquid having a high pressure such as water.

The branch joint of the first embodiment is shown with a partial cross-section. The branch joint main body of 1st embodiment is shown with the cross section with the main pipe. (A) is a plan view of a single seal plug, and (b) is a cross-sectional view of the single seal plug. The main plug closing form of the seal plug in the first embodiment is shown in a partially enlarged view. (A)-(c) shows the perforation process of the opening which leads from the branch cylinder part to the main pipe. (A)-(c) show the attachment process of the seal plug. (A) shows one process of attaching the seal cap, and (b) shows the details of the seal form on the upper end side of the branch cylinder part in an enlarged sectional view. (A) is a perspective view of the seal cap and the O-ring holder, and (b) is a cross-sectional view of the O-ring holder engaged with the seal cap. FIG. 9 is a sectional view showing a state in which the seal cap in the state of FIG. (A)-(c) show the main plug closing process. The branch joint main body of 2nd embodiment is shown with sectional drawing with the main pipe. (A) is a plan view of a single seal plug, and (b) is a cross-sectional view of the single seal plug. (A) shows the main plug closing form of the seal plug in the second embodiment in a partially enlarged sectional view, and (b) shows another example of the second embodiment. The branch joint main body of 3rd embodiment is shown with sectional drawing with the main pipe. (A) is a sectional view of the seal plug alone in the third embodiment, (b) is a partially enlarged view of the main plug closure form of the seal plug in the third embodiment, and (c) is the third The seal form of the branch cylinder part upper end side in this embodiment is shown with the partial expanded sectional view. (A) shows a branch joint body of the fourth embodiment in a sectional view, (b) shows a seal plug of the fourth embodiment in a half sectional view, and (c) shows a plan view of (b). It is shown. (A) is a cross-sectional view of the main plug-closing form by the seal plug of the fourth embodiment.

1, 51, 81 Saddle part 2, 52, 82 Branch tube part 3, 53, 83 Branch pipe connection part 4, 21, 54, 84 Straight surface 5, 55, 85, 93 Circumferential groove 6, 25, 56, 94 O Ring 7, 57, 87 Female thread 8, 58, 89 Opening 10, 50, 80 Branch joint body 20, 60, 90 Seal plug 22, 62, 91 Male thread 59, 88, 96 Flat part 65, 86 Ring-shaped seal Packing (O-ring)
72 Disc-shaped seal packing 95 Cutting edge 100 Main pipe 200 Seal cap 300 Branch pipe A Branch joint W Water

Claims (4)

A saddle portion mounted on the main pipe, a branch cylinder portion standing on the surface of the saddle portion and having an internal thread formed on the inner surface, and a branch pipe connection portion protruding from the side wall of the branch cylinder portion In a branch joint in which a cylindrical seal plug is fitted into a female screw on the inner surface of the branch cylinder part with a male screw formed on a peripheral surface thereof in the branch cylinder part,
A predetermined range of an opening leading to the main pipe of the saddle portion or an inner surface near the main pipe of the branch cylinder portion is a non-forming portion of the female screw, and a non-forming portion of the female screw is directed toward the main pipe. The diameter of the seal plug is reduced in the middle to form a stepped shape. When the plug is closed, the end surface on the main pipe side comes into contact with the stepped shape on the main pipe side. A predetermined range from the end is a non-formed part of the male screw, and the non-formed part of the male screw is fitted with a ring-shaped seal packing having self-sealing properties. A branch joint characterized by being in close contact with a non-formed portion of the female screw. A saddle portion mounted on the main pipe, a branch cylinder portion standing on the surface of the saddle portion and having an internal thread formed on the inner surface, and a branch pipe connection portion protruding from the side wall of the branch cylinder portion In the branch joint, a cylindrical seal plug is attached to the branch cylinder portion by being screwed onto the female screw on the inner surface of the branch cylinder portion with a male screw formed on a peripheral surface thereof.
An opening leading to the main pipe of the saddle section or an inner surface closer to the main pipe of the branch cylinder section is reduced in diameter in the direction toward the main pipe to form a stepped shape, and the book of the seal plug A ring-shaped or disk-shaped seal packing having a self-sealing property is fixed to the tube side end face, and the seal packing is adapted to be in close contact with the stepped shape step portion when closing. Characteristic branch joint. In the branch joint according to claim 1 or 2 ,
The inner surface of the branch cylinder portion is a non-formed portion of the female screw over a predetermined range from the end portion, and a circumferential groove is formed in the non-formed portion of the female screw. A bifurcation characterized in that a ring-shaped second seal packing having a self-sealing property is mounted, and the end of the seal plug opposite to the main pipe is in close contact with the second seal packing. Fittings. In the branch joint according to any one of claims 1 to 3 ,
A seal packing holder that has a cylindrical surface on the inner surface of the top surface of the seal cap that is screwed onto the outer surface of the branch cylinder portion, and that the cylindrical surface rotates concentrically with the axis of the branch cylinder portion. A ring-shaped third seal packing having a self-sealing property is slidably mounted on the cylindrical surface, and the inner surface of the branch tube portion has a predetermined range from the end thereof. A branch joint, wherein the female screw is a non-formed part, and when the seal cap is screwed, the seal packing comes into close contact with the non-formed part of the female screw.