JPH09166259A - Pipe joint for connecting branch pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To check air-tightness for whether good or bad of an individual seal built in a branch pipe connecting pipe joint, in the case of inspecting air- tightness in a mounting part of the branch pipe connecting pipe joint of this kind, by double sealing all clearance passages with possibility of gas leakage, and enhancing reliability of air-tightness. SOLUTION: A receiving fixture 1 and a retaining fixture 2 are arranged respectively in an internal/external surface side of a main pipe wall 101, a connection part 32 of a joint main unit 3 and a connected part 13 of the receiving fixture 1 are screwed together. Each of the first to third seal materials 51, 52, 53 is respectively interposed each between the joint main unit 3 and the receiving fixture 1, between the receiving fixture l and the main pipe wall 101 and between the retaining fixture 2 and the main pipe wall 101. A nut unit 4 is screwed in an external thread 36 in a main part 35 of the joint main unit 3. The fourth seal material 54 is interposed between the nut unit 4, the main part 35 and the retaining fixture 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch pipe connecting pipe joint used when a branch passage is connected to a pipe such as a gas pipe.

[0002]

2. Description of the Related Art FIG. 11 shows a conventional pipe joint for branch pipe connection described in Japanese Patent Laid-Open No. 5-272683. This branch pipe connecting pipe joint is provided with a receiving member 11 on an inner surface 103 of a rim portion of a branch port 102 formed in a main pipe wall 101.
0 facing each other, and the outer surface 1 of the rim of the branch opening 102.
04 and the joint body 120 are opposed to each other, and the receiving member 1
10 and the sealing member 131 between the inner surface 103 of the lip.
A sealing material 132 between the joint body 120 and the outer surface 104 of the rim portion, and a sealing material 133 between the receiving tool 110 and the joint body 120.
Head portion bolt 140 inserted in the bolt insertion portion 122 provided in the
It is attached to the main pipe 100 by screwing into 2 and tightening. Further, in this branch pipe connecting pipe joint, the joint main body 120 has branch connecting ports 123, 124.
In addition to the above, a female screw 125 that is used when performing an airtight inspection of a connecting portion between the main pipe 100 and the branch pipe connecting pipe joint is provided.

As shown in FIG. 11, the airtightness test is conducted by the female screw 1 described above.
Connection port 1 for branching by screwing blind lid 150 into 25
Internal passages 126 and 127 of 23 and 124 and the receiving member 110
When the internal pressure of the conduit of the main pipe 100 is increased in this state by interrupting the communication state with the branch passage 128 formed by the joint main body 120 and the branch body 128, the above-mentioned edge portions of the joint main body 120 and the main pipe wall 101 are cut off. This is an inspection for checking the presence / absence of gas leakage from the intervening portion of the sealing material 132 between the outer surface 104.

[0004]

However, when the airtightness test is performed in the state of FIG. 11, the joint body 120 and the main wall 1
If the airtightness is maintained by the sealing material 132 interposed between the inner surface 103 of the rim 01 and the inner surface 103, the airtightness by the other sealing materials 131 and 133 is not sufficiently exerted. In the inspection, it is handled as if no gas leak was found. If the airtightness is not sufficiently exhibited by the other sealing materials 131 and 133, but it is determined that no gas leakage is found in the airtightness test, the sealing material 13
In addition to 2, there was a problem that the intention to improve the airtight reliability by incorporating these other sealing materials 131 and 133 would not be achieved.

Therefore, the inventor of the present application prototyped the branch pipe connecting pipe joint B shown in FIGS. 9 and 10. This one includes a receiving tool 210, a holding tool 220, and a joint body 230. The receiving part 210 has a tubular connected part 211 having an internal thread 212 on its inner peripheral surface and a flange part 213 provided on the connected part 211, and a branch provided on the main wall 101. The connected portion 211 is inserted into the mouth 102, and the collar portion 213 is arranged so as to face the inner surface 103 of the rim portion of the branch mouth 102. The retainer 220 includes a tubular portion 221 and the tubular portion 2 thereof.
21 and a flange portion 222 provided on the cylindrical portion 22.
1 is inserted into the branch port 102 and externally fitted to the connected portion 211 of the receiving member 210, and further, the flange portion 222 is provided so as to face the outer surface 104 of the rim portion. Further, the joint body 230 has a tubular connecting portion 231 having an external thread 232 on the outer peripheral surface thereof, and a main portion 232 provided on the connecting portion 231, and the main portion 232 has a branch connection port 235. Is provided. Then, the connecting portion 231 is the receiving member 21.
It is screwed and inserted into the connected part 211 of 0.

In this branch pipe connecting pipe joint B, the first sealing member 241 is provided between the connected portion 211 of the receiving member 210 and the connecting portion 231 of the joint body 230 screwed to the receiving member 210. 213 and main wall 101
The second seal member 242 is provided between the inner surface 103 of
However, the collar 222 of the retainer 220 and the outer surface 104 of the rim portion are
And a fourth seal member 244 between the main portion 233 of the joint body 230 and the retainer 220.
Each is intervened. The main pipe 100 shown in FIGS. 9 and 10 is a cast iron pipe 105 provided with an inner surface lining layer 106 of vinyl chloride resin, and a gap 107 may be formed between the two. .

When airtightly inspecting the connection between the branch pipe connecting pipe joint B and the main pipe 100, a female screw 234 provided in the main portion 233 of the joint body 230 is used to show a blind line indicated by an imaginary line. The lid 250 is screwed in, and the blind lid 250 blocks the connection state of the branch connection port 235 with the branch passage 236 formed by the connecting portion 231. In addition, the joint portion 231 of the joint body 230 is connected to the connected portion 211 of the holder 210 by adjusting the joint portion 231 of the joint body 230 and the retainer 220 so as not to be airtight by the fourth sealing material 244. By loosely screwing the second seal member 242 into contact with the inner surface 103 of the mouth edge portion of the main pipe 100 and the flange portion 213 of the receiving member 210, and in that state
By increasing the internal pressure of the pipeline of
It is inspected whether or not gas leaks from the intervening point B of No. 3 and the intervening point B of the fourth sealing material 244.

However, in the airtightness test performed under this condition, the force of screwing the connecting portion 231 of the joint body 230 into the connected portion 211 of the receiving member 210 may be too strong or too weak. When the screw-in force is too strong, one or both of the intervening points a and b are kept airtight by the fourth seal material 244 and the third seal material 243, and the first seal material 241 and the second seal material 241 are sealed. Material 24
It may not be possible to judge the quality of the airtightness that 2 will exhibit, and when the screwing force is too weak, the first sealing material 241 and the second sealing material 242 may exhibit sufficient airtightness. Although it is a thing, the situation that the gas leaks because the adhesion force at those intervening portions is too weak. From these, it was determined that the branch pipe connecting pipe joint described in FIGS. 9 and 10 had a problem in reliability of the airtightness inspection.

The present invention has been made under the above circumstances, and a branch pipe connection having a high airtightness and reliability which can double secure the airtightness of all clearance passages through which gas may leak. For pipe fittings for branching, a branch that can reliably check whether or not each of all the sealing materials incorporated in the branch pipe connecting pipe fittings exhibits the airtightness required for them during its airtightness inspection. An object is to provide a pipe joint for pipe connection.

[0010]

A pipe joint for branch pipe connection according to the present invention is arranged such that a threaded portion is opposed to a connected portion inserted into a branch opening formed in a main pipe wall and an inner surface of a rim portion of the branch opening. And a hole provided to be opposed to the outer surface of the rim of the branch opening and to be opposed to the connected portion of the receiver. At the connecting part that includes the presser foot and the screw part that is inserted into the hole part of the presser foot and screwed into the threaded part of the connected part of the receiving tool, connect the branch connection port and the presser foot to the main wall side. A main body having a pressing portion for pressing is continuously provided, the main body is provided with a male screw, a nut body screwed to the male screw of the main body of the joint body, and a connected portion of the receiver. The first sealing material interposed between the joint portion of the joint body screwed to it, the collar portion of the receiving member, and the above portion. A second seal material interposed between the inner surface of the mouth edge portion of the mouth, a third seal material interposed between the retainer and the outer surface of the mouth edge portion of the branch opening, the main portion of the joint body, and the retainer. And a fourth seal member interposed between a tool and a nut body screwed to the main part of the joint body, and the branch connection port of the joint body attached to the main pipe in cooperation with the receiver. The section is configured to communicate with the main conduit.

Here, the connected portion of the receiving member is cylindrical and the threaded portion thereof is a female thread, the threaded portion of the connecting portion of the joint body is a male screw, and the connected portion is penetrating into the connected portion. It is possible to adopt a configuration in which the joint main body is provided with a flow passage for communicating the branch connection port portion thereof with the main pipe passage. The male screw of the connecting portion is formed in a portion excluding the lower end outer peripheral surface of the connecting portion, and a first screw is formed between the lower end outer peripheral surface of the connecting portion where the male screw is not formed and the connected portion of the receiver. A configuration in which a sealing material is interposed can be adopted.

It should be noted that the connected portion of the receiving member is tubular and the threaded portion thereof is a male screw, the threaded portion of the connecting portion of the joint body is a female screw, and the connected portion penetrates the connected portion. It is also possible to adopt a configuration in which they are screwed together.In that case, the branch connection port of the joint body is connected to the main pipe line in both the receiver and the joint body. It is necessary to provide a flow passage to allow it.

When the branch pipe connecting pipe joint having the above-mentioned structure is attached to the main pipe, the gap passages through which gas may leak at the connecting portion between the branch pipe connecting pipe joint and the main pipe,
A gap passage including each intervening portion of the first seal material and the third seal material, a gap passage including each intervening portion of the first seal material and the fourth seal material, and each intervening portion of the second seal material and the third seal material. There are four gap passages including the gap passage and the gap passage including the intervening portions of the second sealing material and the fourth sealing material. Therefore, if all the first to fourth sealing materials exhibit proper airtightness, the airtightness is doubly secured by the two sealing materials for all the four gap passages in which gas may leak. It can be used as a pipe joint for branch pipe connection with high airtightness and reliability.

In this branch pipe connecting pipe joint, the airtightness test is performed by removing the nut body and the fourth seal member from each other.
It is performed individually in both the state where they are attached.

That is, in the airtightness test with the nut body and the fourth seal member removed, the connected portion of the receiving member is inserted into the branch port of the main pipe wall, and the flange portion and the edge of the branch port are connected. While the second sealing material is interposed between the inner surface of the joint and the inner surface of the joint, the connecting portion of the joint main body is inserted into the hole of the retainer arranged so as to face the outer surface of the rim of the branch opening, and the connecting portion is covered by the above-mentioned cover. While screwing to the connecting portion, a third sealing material is provided between the holding tool and the outer surface of the edge portion of the branch opening, and a first sealing material is provided between the connected portion of the receiving tool and the connecting portion of the joint body. First of all,
~ The third sealing member is performed in a state in which the connecting member of the joint body is fastened to the connected member of the receiving member with a force of a magnitude sufficient to exert airtightness at each intervening position of the three sealing members.
In other words, it is possible to attach the receiving member, the pressing member, the joint body, and each of the first to third sealing members to the main pipe so that the main pipe is in the same state as the actual use state.

In this state, a blind lid is attached to the joint body and an airtightness test is performed, so that it is possible to determine whether the airtightness is good or not at the intervening portion of the first sealing material or the second sealing material. That is, if the airtightness of the first seal material or the second seal material is poor, gas leakage is recognized from the gap passage between the main part of the joint body and the retainer (the gap passage in which the fourth seal material is interposed). To be Here, when it is desired to identify whether the airtightness is the intervening location of the first sealing material or the intervening location of the second sealing material, the first sealing material or the second sealing material is replaced, and the airtightness inspection is repeated. It is possible to specify whether the poor sealing property is the first sealing material or the second sealing material.

If it is not confirmed that gas is leaking from the gap passage between the main part of the joint body and the retainer, the first
Since it can be judged that both the sealant and the second sealant exhibit good airtightness, the nut body is screwed into the main body of the joint body, and the main body of the joint body and the retainer and nut body are By tightening the nut body with the fourth seal member interposed, the branch pipe connecting pipe joint can be put to practical use.

Here, the quality of the airtightness by the third sealing material or the fourth sealing material can be judged by performing the following work. That is, under the condition that gas is leaking from the gap passage between the main part of the joint body and the retainer, the nut body is screwed into the main part of the joint body, and the main part of the joint body and the retainer and nut are By performing the airtightness inspection with the fourth sealant interposed between the body and the body, it is possible to determine whether the airtightness of the third sealant or the fourth sealant is good or bad.
That is, when gas leakage is recognized only from the intervening portion of the third sealing material, it can be determined that the airtightness of the third sealing material is poor, and gas leakage is recognized only from the intervening portion of the fourth sealing material. When it is determined that the airtightness of the fourth sealant is poor, it can be determined that the gastightness of both the third sealant and the fourth sealant is poor when the gas leakage is recognized from both. . If no gas is leaked from any of the intervening portions of the third sealing material and the fourth sealing material, it can be determined that the airtightness of these sealing materials is kept good.

[0019]

1 is a vertical sectional front view showing a state in which a branch pipe connecting pipe joint A according to an embodiment of the present invention is attached to a main pipe 100, and FIG. 2 shows an embodiment for carrying out an airtight inspection. FIG. 3 is a vertical sectional front view, and FIG. 3 is a branch port 1 formed in the main wall 101.
FIG. 4 is an explanatory view showing the shape of 02, and FIG. 4 is a partially cutaway side view of the branch pipe connecting pipe joint A in which a branch pipe line is connected.

In the main pipe 100, a cast iron pipe 105 is provided with an inner lining layer 106 of vinyl chloride resin, and a gap 107 may be formed between the two.

The branch pipe connecting pipe joint A includes a receiving member 1, a pressing member 2, a joint body 3, and a nut body 4.

The receiving tool 1 has a tubular connected portion 13 having an internal thread 12 on its inner peripheral surface and a flange portion 14 provided on the connected portion 13, and the flange portion 14 has a second portion. The holding groove 15 for the sealing material 52 is formed in an annular shape, and the holding groove 16 for the first sealing material 51 is formed in an annular shape at the base of the connected portion 13. The inner surface of the collar portion 14 of the receiver 1 has a three-dimensional shape along the inner surface of the main wall 101,
Further, the outer peripheral surface of the connected portion 143 is so large as to have a regular circular branch port 102 (see FIG. 3) formed in the main pipe wall 101 formed by the pipe wall of the gun iron pipe 105 and the inner surface lining layer 106. It has a shape that can be fitted without rattling. The receiver 1 is arranged such that the connected portion 13 is inserted into the branch opening 102 and the flange portion 213 faces the inner surface 103 of the edge portion of the branch opening 102. The receiving tool 1 is inserted into the inside of the main pipe 100 from the pipe end of the main pipe 100 and arranged as described above.

The retainer 2 has a holding groove 21 for the third seal member 53 in an annular shape, and has a hole 22 in the center thereof, and the inner surface of the retainer 2 is the main wall 101. It has a three-dimensional shape along the outer surface. The holding tool 2 is disposed on the outer surface side of the main pipe wall 101 with the hole 22 facing the connected portion 13 of the receiving tool 1 and faces the outer surface 104 of the rim of the branch port 102. .

The joint body 3 comprises a cylindrical connecting portion 32 having an external thread 31 on the outer peripheral surface thereof, and a main portion 35 having a branch connecting port portion 33 and a stepped pressing portion 34, which are connected to each other. The main portion 35 is provided with a male screw 36, and the connecting portion 3
A part of 2 is a rotary tool insertion portion 39 having a polygonal wall surface. In this joint body 3, the male screw 31 of the connecting portion 32 inserted into the hole 22 of the holding tool 2 is screwed with the female screw 12 of the connected portion 13 of the receiving tool 1.
And in the example of this figure, the connecting part 32 is the connected part 1
It has a length to insert 3. A taper female screw 37 is provided on the inner surface of the main portion 35 of the joint body 3.

The nut body 4 is screwed onto the male screw 36 of the main portion 35 of the joint body 3 as shown in FIGS. 1 and 4, and has a seal seat surface 41 provided in a tapered shape on the inner peripheral surface of one end thereof. ing.

Here, the first sealing material 51 held in the holding groove 16 is interposed between the connected portion 13 of the receiver 1 and the connecting portion 32 of the joint body 3 screwed to the connected portion 13.
In the illustrated example, the male screw 31 of the connecting portion 32 is formed on a portion of the connecting portion 32 excluding the outer peripheral surface of the lower end portion, and the male screw 31 is formed on the outer peripheral surface 32a of the lower end portion of the connecting portion 32 where the male screw 31 is not formed. 1 sealing material 51 corresponds. Further, the second sealing material 52 held in the holding groove 15 includes the collar portion 14 of the receiving tool 1 and the inner surface 103 of the edge portion of the branch opening 102.
And is interposed between them. Further, the third seal member 53 held in the holding groove 21 is provided with the pressing member 2 and the branch port 102.
And the outer surface 103 of the rim portion. The fourth seal member 54 is interposed between the main portion 35 of the joint body 3, the retainer 2, and the seal seat surface 41 of the nut body 4 screwed onto the main portion 35 of the joint body 3.

In the branch pipe connecting pipe joint A attached to the main pipe 100 as shown in FIG. 1, the branch connecting port portion 33 of the joint main body 3 passes through the flow passage 38 of the joint main body 3 to connect the main pipe 100 to the main pipe 100. Connected to the pipeline.

In this branch pipe connecting pipe joint A, a normal airtightness inspection is carried out in the mounted state of FIG. 2 with the nut body 4 and the fourth seal member 54 removed. That is, the connecting portion of the joint main body 3 is exerted by a force having a sufficient amount of airtightness by the respective sealing materials 51, 52, 53 at the intervening points of the first to third three sealing materials 51, 52, 53. 32 receiver 1
It is performed in a state in which it is fastened to the connected portion 13. This state is the same as the actual use state. Further, as shown in FIG. 2, the blind lid 6 is attached using the taper female screw 37 of the joint body 3 as shown by an imaginary line in the figure, and the blind lid 6 seals the flow passage 38.

First sealing material 51 or second sealing material 52
If the airtightness is poor due to the above, the airtightness test shows that gas leaks from the gap passage between the main portion 35 of the joint body 3 and the retainer 2 corresponding to the portion a where the fourth seal member 54 is interposed. Therefore, it is possible to judge whether the airtightness at the intervening portion of the first sealing material 51 or the second sealing material 52 is good or bad. When no gas is leaked from the location a, it can be determined that the first sealing material 51 and the second sealing material 52 both exhibit good airtightness. for that reason,
As shown in FIG. 1, the nut body 4 is screwed into the main portion 35 of the joint body 3 and the fourth seal member 41 is provided between the main portion 35 of the joint body 3, the retainer 2 and the seal seat surface 41 of the nut body 4. When the nut body 4 is tightened by interposing, the pipe joint for connecting the branch pipe can be put to practical use.

FIG. 4 shows that a T-shaped joint C is attached to the branch connection port 33 of the branch-pipe connecting pipe joint A that has passed such an airtight inspection, and the T-joint C is connected to the branch pipe via a mechanical joint E. An example in which D is attached is shown.

By the way, normally, it is sufficient for the airtightness inspection to check whether or not the airtightness is maintained by the first sealant 51 or the second sealant 52, but in some cases, the first sealant 51 is used. There is also a case where it is desired to specify which of the second sealing material 52 and the second sealing material 52 is defective in airtightness, or to judge whether the third sealing material 53 or the fourth sealing material 54 has good airtightness. Next, a case of inspecting them will be described.

When it is desired to identify whether the airtightness is the intervening portion of the first sealing material 51 or the intervening portion of the second sealing material 52, the fourth portion can be determined in the above-mentioned normal airtightness inspection described with reference to FIG. Under the situation that gas leakage from the intervening portion a of the sealing material 54 is recognized, the first sealing material 51 or the second sealing material 52 is replaced and the airtightness inspection is repeated, so that the sealing material having poor airtightness becomes the first sealing material. It is possible to specify whether it is the material 51 or the second sealing material 52.

Third sealing material 53 or fourth sealing material 54
The determination of whether the airtightness is good or not can be made by performing the following work. In a situation in which it is recognized that gas is leaking from the intervening portion a of the fourth sealing material 54,
Attach the nut body 4 and the fourth seal member 54 as shown in
Airtightness inspection is performed in this state. When gas leak is observed only from the intervening portion of the third sealing material 53 during such an airtightness test, it can be determined that the airtightness of the third sealing material 53 is poor, and the fourth sealing material 54 If gas leakage is found only from the intervening part of the
It can be judged that the airtightness due to the sealing material 54 is poor, and both
When gas leakage is recognized from 3, 54, it can be determined that the airtightness due to both the third sealing material 53 and the fourth sealing material 54 is poor. If no gas is leaked from any of the intervening portions of the third sealing material 53 and the fourth sealing material 54, it can be determined that the airtightness of the sealing materials 53 and 54 is kept good.

When the branch pipe connecting pipe joint A is attached to the main pipe 100 as shown in FIGS. 1 and 4, gas may leak at the connecting portion between the branch pipe connecting pipe joint A and the main pipe 100. The gap passage having the gap is a gap passage including the intervening portions of the first seal material 51 and the third seal material 53, and the first seal material 5
A gap passage including the intervening portions of the first and fourth sealing members 54, a gap passage including the intervening portions of the second sealing member 52 and the third sealing members 53, each interposition of the second sealing member 52 and the fourth sealing members 54 There are four places in the gap passage including the places. Therefore, when all of the first to fourth sealing members 51 to 54 exhibit proper airtightness, the four air gaps may leak in all of the four gap passages that may leak gas. Therefore, high airtightness and reliability can be obtained.

FIG. 5 is a vertical sectional front view showing a state in which a branch pipe connecting pipe joint A according to another embodiment is attached to the main pipe 100,
FIG. 6 is a vertical cross-sectional front view showing an embodiment for carrying out an airtight inspection, FIG.
Is an explanatory view showing the shape of a branch port 102 formed in a main pipe wall 101, and FIG. 8 shows the branch pipe connecting pipe joint A as a main pipe 1
It is a vertical side view in the state attached to 00.

In this embodiment, the branch port 10
2 has a cocoon shape as shown in FIG. Then, as shown in FIG. 5 and FIG.
Protrusions 17 and 17 are provided to properly position the branch with respect to the branch opening 102. Further, the presser foot 3 is also provided with projections 23, 23 for appropriately positioning the presser foot 2 with respect to the branch port 102. Further, as shown in FIG. 7, the receiving tool 1 has a height h shorter than a short width R of the branch opening 102 and a lateral width L thereof being a long width K of the branch opening 102.
It is shorter than the above, and the receiving tool 1 can be vertically oriented to pass through the branch opening 102. Other configurations and operations are similar to those described with reference to FIGS. 1, 2 and 4, and therefore, the same or corresponding parts will be denoted by the same reference numerals and detailed description thereof will be omitted.

[0037]

According to the pipe joint for branch pipe connection according to the present invention, all of the gap passages where gas may leak are 2 or more.
As each sealing material double keeps airtight,
There is an effect that it becomes possible to provide a pipe joint for branch pipe connection with high airtightness and reliability.

Further, in the airtightness inspection after the branch pipe connecting pipe joint is attached to the main pipe, the first seal material and the second seal material are used to first shut off the gas flowing through the pipe line of the main pipe. The quality of the airtightness can be reliably determined. Therefore, although the airtightness of the first sealing material or the second sealing material is poor, an unfavorable situation such as passing the inspection without gas leakage is not caused, and as described above. The outstanding effect is that the intention of maintaining double airtight passages to improve airtight reliability is not impaired. The branch pipe connecting pipe joint of the present invention has an advantage that the quality of the sealing performance of each of the first to fourth sealing materials can be individually judged.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional front view showing a state in which a branch pipe connecting pipe joint according to an embodiment of the present invention is attached to a main pipe.

FIG. 2 is a vertical cross-sectional front view showing an embodiment for carrying out an airtight inspection of a joint between a branch pipe connecting pipe joint of FIG. 1 and a main pipe.

FIG. 3 is an explanatory diagram showing a shape of a branch opening.

FIG. 4 is a partially cutaway side view of a branch pipe connecting pipe joint connected to a branch pipe line.

FIG. 5 is a vertical sectional front view showing a state in which a branch pipe connecting pipe joint according to another embodiment of the present invention is attached to a main pipe.

FIG. 6 is a vertical cross-sectional front view showing an embodiment in which an airtightness inspection is performed on a joint between the branch pipe connecting pipe joint of FIG. 5 and the main pipe.

FIG. 7 is an explanatory diagram showing a shape of a branch opening and the like.

FIG. 8 is a vertical sectional side view showing a state in which a pipe joint for connecting a branch pipe is attached to a main pipe.

FIG. 9 is a vertical cross-sectional front view showing an embodiment for carrying out an airtight inspection of a joint between a branch pipe connecting pipe joint and a main pipe of a comparative example.

FIG. 10 is a vertical cross-sectional side view showing an embodiment for performing an airtight inspection of a joint between a branch pipe connecting pipe joint and a main pipe of a comparative example.

FIG. 11 is a vertical cross-sectional front view showing a connection point between a conventional branch pipe connecting pipe joint and a main pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving tool 2 Pressing tool 4 Nut body 12 Female screw (screw part) 13 Connected part 14 Collar part 22 Hole part 31 Male screw (screw part) 32 Connecting part 32a Lower end outer peripheral surface of connecting part 33 Branch connection port part 34 Pressing Part 35 Main part 36 Male screw 38 Flow passage 51 First seal material 52 Second seal material 53 Third seal material 54 Fourth seal material 101 Main wall 102 Branch port 103 Branch port inner surface of branch port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazushige Nishimura One day at 153 Tajime-cho, Kishiwada-shi, Osaka

Claims (3)

[Claims] 1. A receiving member provided with a threaded portion and a collar portion arranged to face an inner surface of a rim portion of the branch opening in a connected portion to be inserted into the branch opening formed in the main wall. A presser having a hole provided to face the outer surface of the rim of the branch opening and to face the connected portion of the receiver, and the presser to be inserted into the hole of the presser. A main portion having a branching connection port portion and a pressing portion for pressing the holding member to the main wall side is continuously provided to the connecting portion having a threaded portion screwed into the threaded portion of the receiving portion, The main body of the joint body is equipped with a male thread, the nut body is screwed to the male thread of the main body of the joint body, and it is interposed between the connected part of the receiver and the joint part of the joint body screwed to it. A first seal member, and a second seal member interposed between the flange portion of the receiving member and the inner surface of the edge portion of the branch opening. Material, a third seal member interposed between the retainer and the outer surface of the rim of the branch opening, and between the main body of the joint body and the nut body screwed to the retainer and the main body of the joint body. And a fourth seal member interposed in the main body, and is configured so that the branch connection port of the joint body, which is attached to the main pipe in cooperation with the receiving member, communicates with the main pipe line. Branch pipe connection pipe joint characterized by being 2. The connected part of the receiving member is cylindrical and the threaded part thereof is an internal thread, the threaded part of the connecting part of the joint body is an external thread, and the connected part penetrates the connected part. In addition to being screwed together, the joint body
The pipe joint for branch pipe connection according to claim 1, wherein a flow passage is provided to connect the branch connection port portion to the pipe passage of the main pipe. 3. The male screw of the connecting portion of the joint body is formed on a portion of the connecting portion excluding the outer peripheral surface of the lower end portion,
The pipe joint for branch pipe connection according to claim 2, wherein the first seal member is interposed between the outer peripheral surface of the lower end portion of the connecting portion where the male screw is not formed and the connected portion of the receiver.