JP2008106866A - Pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe fitting allowing a connection pipe to be inserted to a predetermined position of a lip part by smaller insertion force without using lubricant, and hard for the pipe to be drawn once connected. <P>SOLUTION: The pipe fitting has a rubber ring installed on a socket, which comprises a body part having a tubular shape and the lip part having an almost trumpet shape gradually reduced in diameter from an end of the body part to the other end and closely contacting in a water tight manner with the outer wall surface of the connected piping material. The rubber ring is characterized in that: an acute-angled corner portion between the body part and the lip part is formed in an R shape having a curvature radius exceeding 2.0 mm and smaller than 3.0 mm; the maximum thick wall portion is formed in a wall thickness which is compressed at a ratio of 1% or more and 30% or less when the insertion of the pipe; and at least a socket inlet side of the outer wall surface is bonded and fixed to a socket inner wall surface. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint. In particular, the present invention relates to a drainage collective joint for multilayer buildings.

As a collective joint with a side branch pipe connection port on the side connecting the side branch pipe that leads drainage discharged from sanitary equipment etc. of each floor to the drainage pipe while forming the drainage pipe of the multi-layer building, The horizontal branch pipe connection port is provided with a receiving port, and a cylindrical main body part is formed in the receiving port, and a substantially trumpet shape that gradually decreases in diameter from one end of the main body unit toward the other end. A pipe joint (see, for example, Patent Document 1) equipped with a rubber ring provided with a lip portion that tightly adheres to the outer peripheral surface of a branch pipe is on the market.
That is, in the case of such a pipe joint, just by inserting the horizontal branch pipe into the receiving port, the lip portion of the rubber ring in the receiving port is in close contact with the outer peripheral surface of the horizontal branch tube with one touch and water can be stopped. The connection between the side branch pipe and the pipe joint can be secured.

  However, in the case of the pipe joint as described above, conventionally, in order to facilitate insertion of the side branch pipe into the lip portion, when inserting the side branch pipe, at least one of the inner wall surface of the lip portion and the outer peripheral surface of the side branch pipe is used. Since the lubricant is applied to the crab, the connected sideways when the pipe operator touches the side branch pipe connected by the influence of the lubricant after the connection or an excessive tensile load is applied in the middle of the pipe. There was a problem that the branch pipe pulled out.

Therefore, by making the axial position of the root corner formed on the back side of the protruding base part of the lip part substantially coincide with the axial position of the contact start point of the connected lateral branch pipe to the lip part, no lubricant is used. However, there has already been proposed a pipe joint that facilitates the insertion of the side branch pipe into the lip portion and is difficult to pull out the side branch pipe once connected (see Patent Document 2).
However, in the case of this pipe joint, although the ease of insertion was facilitated without using a lubricant, the absolute value of the insertion force was inevitably large to ensure the pull-out resistance, which was sufficiently satisfactory in terms of workability. It was not something that could be done.

Japanese Utility Model Publication No. 55-5833 JP 2001-82645 A

  In view of the above circumstances, the present invention is able to insert a pipe to be connected to a predetermined position of the lip portion with less insertion force without using a lubricant, and once connected, the pipe joint is difficult to pull out. The purpose is to provide.

  In order to achieve the above object, a pipe joint according to claim 1 of the present invention (hereinafter referred to as “pipe joint according to claim 1”) includes a cylindrical main body part and one end to the other end of the main body part. In a pipe joint in which a rubber ring provided with a lip portion that is in close contact with the outer wall surface of a pipe material to be connected that has a substantially trumpet shape that gradually decreases in diameter toward a water pipe is attached to a receiving port, the rubber ring is The corner portion on the acute angle side of the main body portion and the lip portion has an R shape with a radius of curvature of more than 2.0 mm and less than 3.0 mm, and the maximum thickness portion is 1% or more and 30 when the tube is inserted %, The outer wall surface is bonded and fixed to the inner wall surface of the receiving port.

  The pipe joint according to claim 2 of the present invention (hereinafter referred to as "the pipe joint of claim 2") is the pipe joint according to claim 1, wherein the lip portion of the rubber ring is 110% or more and 125% when the pipe is inserted. A rubber ring is formed so as to be stretched in the axial direction at the following ratio.

  The pipe joint according to claim 3 of the present invention (hereinafter referred to as "the pipe joint of claim 3") is the hardness (Hs) of the rubber forming the rubber ring in the pipe joint of claim 1 or claim 2. Is 50 or more and 75 or less.

  In the pipe joint of the present invention, the rubber ring is limited to the corner portion on the acute angle side of the main body portion and the lip portion having an R shape with a radius of curvature of more than 2.0 mm and not more than 3.0 mm. But why. This is because, when the radius of curvature is 2.0 mm or less, the connected pipe is easily pulled out, and when it exceeds 3.0 mm, the insertion load increases and the workability deteriorates.

  In addition, the compression ratio when inserting the maximum thickness portion into the tube is limited to 1% or more and 30% or less. If the reason is less than 1%, sufficient pulling resistance cannot be obtained. This is because if it exceeds 50%, the insertion resistance becomes too large, and the workability deteriorates. In addition, the preferable compression rate at the time of tube insertion of the maximum thickness part is 5% or more and 20% or less.

  Although it does not specifically limit as an adhesive agent which adhere | attaches the outer wall surface of a rubber ring, and the inner wall surface of a receptacle, For example, an epoxy-type adhesive agent and a silicone type adhesive agent are mentioned.

  In the pipe joint of the present invention, the rubber constituting the rubber ring is not particularly limited. For example, EPDM (ethylene-propylene rubber), NBR (nitrile rubber), SBR (styrene-butadiene rubber), CR (chloroprene rubber) EPDM is preferably used among them.

Moreover, the hardness of the rubber used for the rubber ring (according to the test method of Hs, JIS K6253) is not particularly limited, but is preferably 50 or more and 75 or less as in the pipe joint of claim 3.
That is, if the hardness of the rubber is less than 50, there is a risk of causing a problem that the water tightness is lowered, and if it exceeds 75, there is a possibility that the insertion resistance is increased and the workability is deteriorated.

Further, the lip portion of the comb ring is preferably formed so as to be stretched in the axial direction at a rate of 110% or more and 125% or less when the tube is inserted as in the pipe joint of claim 2.
That is, if the ratio of the lip stretched during tube insertion is less than 110%, there is a risk that short-term water tightness will be reduced. If it exceeds 125%, fatigue will increase and long-term water tightness will occur. May cause a problem of lowering.

In the pipe joint of claim 1, as described above, the corner portion on the acute angle side of the main body portion and the lip portion of the rubber ring is formed in an R shape having a curvature radius of more than 2.0 mm and not more than 3.0 mm. Since the thick part is formed into a thickness that is compressed at a rate of 1% or more and 30% or less when the pipe is inserted, and at least the receiving inlet side of the outer wall surface of the rubber ring is adhesively fixed to the receiving inner wall surface. When inserting the pipe connected to the lip part, the inlet side part of the rubber ring is not pulled into the back side of the outlet as the pipe is inserted, and the pipe is smoothly ripped with little force If the tube enters the part and a large pulling force is not applied, the tube is connected in a watertight manner without being pulled out.
Therefore, it is easy to connect the pipe to the receptacle without using a lubricant, and a highly safe connection state can be obtained.

  In the pipe joint of claim 2, since the rubber ring is formed so that the lip portion of the comb ring is stretched in the axial direction at a rate of 110% or more and 125% or less when the pipe is inserted, the watertightness is short-term and long-term. An excellent pipe joint can be obtained.

Since the pipe joint of claim 3 has a hardness of rubber used for the rubber ring of 50 or more and 75 or less,
A pipe joint excellent in water tightness and workability can be obtained.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 to 3 show a first embodiment of a pipe joint according to the present invention.

  As shown in FIG. 1, the joint body 1a has a joint body 1a having a receiving port 11 for connecting a drainage pipe at the upper end, a flange 12 for connecting the drainage pipe at the lower end, and a side branch pipe connection on the side wall. The receiving port 13 is provided.

  A rubber ring (not shown) similar to that of a normal collective joint is mounted in the receiving port 11, and the vertical pipe and the collective joint A are watertight with one touch by simply inserting the lower end of the drainage vertical pipe from above. Can be connected to.

As shown in FIG. 2, a rubber ring 2 a for a side branch pipe is attached to the side branch pipe receiving port 13.
That is, as shown in FIG. 3, the rubber ring 2 a includes a main body portion 21 and a lip portion 22 and is formed of EPDM having a hardness of Hs 50 to 75, and the outer wall surface on the receiving port side is the receiving inner wall surface. The rubber-modified epoxy resin adhesive 3 is adhered and fixed to.

  The lip portion 22 has a substantially trumpet shape that gradually decreases in diameter from the inlet side of the receiving port 13 of the main body portion 21 toward the back. When the branch pipe is inserted, it is stretched in the axial direction at a rate of 110% to 125%.

Further, the corner portion (lip base end portion) 23 on the acute angle side of the main body portion 21 and the lip portion 22 has an R shape having a curvature radius of more than 2.0 mm and not more than 3.0 mm.
Further, the maximum thickness portion 24 of the rubber ring 2a has such a thickness that the compression rate when the horizontal branch pipe is inserted is 1% or more and 30% or less.

4 and 5 show a second embodiment of the pipe joint according to the present invention.
As shown in FIG. 4, the collective joint B is provided with drainage stand connection ports 15 at the upper and lower ends of the joint body 1b, and two side branch pipe connection receiving ports 16 are orthogonal to the side walls. It is provided as follows.

The lateral branch pipe connection receiving port 16 is formed by fixing a rubber ring fixing ring 16b to a flange-shaped receiving part 16a with bolts so as to sandwich a flange part 25 of a rubber ring 2b described later.
The rubber ring 2b is the same as the rubber ring 2a of the collective joint A except that the rubber ring 2b includes a flange portion 25 projecting outward at the intermediate portion of the main body portion 21.

  That is, in this collective joint B, a rubber-modified epoxy resin adhesive is applied to the outer wall surface of the rubber ring 2b on the inlet side, and then the flange part 25 is connected to the flange-shaped receiving part 16a and the rubber ring fixing ring 16b. The rubber ring fixing ring 16b is integrated with the joint body 1b by fixing the rubber ring fixing ring 16b to the flange-shaped receiving portion 16a with bolts.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, only the outer wall surface of the rubber ring on the inlet entrance side is bonded and fixed to the inner wall surface of the receiver, but the entire outer wall surface of the rubber ring may be bonded and fixed.

  Next, examples of the present invention will be described in detail together with comparative examples.

(Example 1)
A collective joint including a receiving branch for connecting a lateral branch pipe having a nominal diameter of 80A having a shape shown in FIGS.
・ R radius of curvature at corner of main body and lip: 2.5mm
・ Maximum thickness compression ratio: 15%
-Lip end pull rate: 115%
Rubber hardness: Hs = 60
・ Rubber ring adhesion: Yes

(Example 2)
A collective joint provided with a receiving branch for connecting a side branch pipe having a nominal diameter of 80A having the shape shown in FIGS. 4 and 5 in which the state of each part is as follows was produced.
・ R radius of curvature of corner of main body and lip: 2.7mm
・ Maximum thickness compression ratio: 20%
-Lip end pull rate: 115%
・ Rubber hardness: Hs = 55
・ Rubber ring adhesion: Yes

(Example 3)
A collective joint including a receiving branch for connecting a lateral branch pipe having a nominal diameter of 80A having a shape shown in FIGS.
・ R radius of curvature at corner of main body and lip: 2.5mm
・ Maximum thickness compression ratio: 30%
-Lip end pull rate: 115%
Rubber hardness: Hs = 60
・ Rubber ring adhesion: Yes

Example 4
A collective joint including a receiving branch for connecting a lateral branch pipe having a nominal diameter of 80A having a shape shown in FIGS.
・ R radius of curvature at corner of main body and lip: 2.5mm
・ Maximum thickness compression ratio: 15%
-Lip end pull rate: 115%
Rubber hardness: Hs = 75
・ Rubber ring adhesion: Yes

(Example 5)
A collective joint including a receiving branch for connecting a lateral branch pipe having a nominal diameter of 80A having a shape shown in FIGS.
・ R radius of curvature of the corner between the body and lip: 2.1mm
・ Maximum thickness compression ratio: 15%
-Lip end pull rate: 115%
Rubber hardness: Hs = 60
・ Rubber ring adhesion: Yes

(Example 6)
A collective joint provided with a receiving branch for connecting a side branch pipe having a nominal diameter of 80A having the shape shown in FIGS. 4 and 5 in which the state of each part is as follows was produced.
・ R radius of curvature at corner of main body and lip: 2.5mm
・ Maximum thickness compression ratio: 20%
-Lip end pull rate: 135%
Rubber hardness: Hs = 80
・ Rubber ring adhesion: Yes

(Comparative Example 1)
A collective joint provided with a receiving branch for connecting a side branch pipe having a nominal diameter of 80A having the shape shown in FIGS. 4 and 5 in which the state of each part is as follows was produced.
・ R radius of curvature of corner of main body and lip: 1.0mm
・ Maximum thickness compression ratio: 35%
-Lip end pull rate: 115%
Rubber hardness: Hs = 60
・ Rubber ring adhesion: None

(Comparative Example 2)
A collective joint provided with a receiving branch for connecting a side branch pipe having a nominal diameter of 80A having the shape shown in FIGS. 4 and 5 in which the state of each part is as follows was produced.
・ R radius of curvature of corner of main body and lip: 1.0mm
・ Maximum thickness compression ratio: 20%
-Lip end pull rate: 115%
・ Rubber hardness: Hs = 55
・ Rubber ring adhesion: Yes

(Comparative Example 3)
A collective joint provided with a receiving branch for connecting a side branch pipe having a nominal diameter of 80A having the shape shown in FIGS. 4 and 5 in which the state of each part is as follows was produced.
・ R radius of curvature at corner of main body and lip: 2.5mm
・ Maximum thickness compression ratio: 20%
-Lip end pull rate: 115%
・ Rubber hardness: Hs = 55
・ Rubber ring adhesion: None

  For each of the collective joints produced in Examples 1 to 5 and Comparative Examples 1 to 4, a force (insertion force) required for insertion when a vinyl chloride resin pipe having a nominal diameter of 80A is inserted into the side branch pipe connection port, and The pulling force when pulling out after insertion was examined, and the results are shown in Table 1 below.

It is a front view of a 1st embodiment of a pipe joint concerning the present invention. FIG. 2 is a cross-sectional view of a side branch pipe receiving portion of the pipe joint of FIG. 1. It is sectional drawing of the rubber ring with which the receiving part for horizontal branch pipes of the pipe joint of FIG. It is a front view of 2nd Embodiment of the pipe joint concerning this invention. FIG. 5 is a cross-sectional view of a side branch pipe receiving portion of the pipe joint of FIG. 4.

Explanation of symbols

A, B Pipe joint 1a, 1b Joint body 13, 16 Receiving port 2a, 2b Rubber ring 21 Body part 22 Lip part 23 Corner part 24 Maximum thickness part 3 Adhesive

Claims (3)

A rubber ring provided with a cylindrical main body part and a lip part that adheres in a watertight manner to the outer wall surface of a pipe material to be connected that has a substantially trumpet shape that gradually decreases in diameter from one end to the other end of the main body part, In the pipe joint attached to the receiving port,
The rubber ring has an R-shaped corner with a radius of curvature of more than 2.0 mm and less than or equal to 3.0 mm, with the corner portion on the acute angle side between the main body and the lip portion, and the maximum wall thickness when the tube is inserted A pipe joint characterized in that it is formed to a thickness that is compressed at a rate of 1% or more and 30% or less, and at least the receiving inlet side of the outer wall surface is adhesively fixed to the receiving inner wall surface.   The pipe joint according to claim 1, wherein the rubber ring is formed such that the lip portion is stretched in the axial direction at a rate of 110% to 125% when the pipe is inserted.   The pipe joint according to claim 1 or 2, wherein the hardness (Hs) of the rubber forming the rubber ring is 50 or more and 75 or less.

Images