JP2002213677A - Connecting method for piping material of thermoplastic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting method for a thermoplastic resin piping material, which can thereby be inserted easily to inside a pipe fitting to ensure a satisfactory jointing strength. SOLUTION: The connecting method for thermoplastic resin piping material is to joint the piping material 3 with the pipe-fitting via a connecting member 2, wherein the pipe fitting 1 is furnished with a jointing end part 11 having an inside circumferential surface, whose maximum inside diameter d1 is slightly larger than the outside diameter d10 of a connection part 21 of the connecting member 2 and which is diametrically reduced gradually toward inside the fitting 1, where the piping material 3 is fitted to the connection part 21 of the connecting member 2, having an inside diameter d9 slightly smaller than the outside diameter of the piping material 3; a connecting member connection part 12 having an inside diameter d3 constant and some smaller than the outside diameter d10 of the connection part 21 of the connecting member 2; and a cylindrical part 14 having an inside diameter d5, which is approximately the same as the inside diameter of the piping material 3 in the sequence as named, and therein the connection part 21 of the connecting member 2 is inserted to the jointing end part 11 of this pipe fitting 1, and the piping material 3 and jointing member 2, and also the jointing member 2 and fitting 1, are made to be put in friction, so that they are mutually melted and jointed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a thermoplastic resin pipe.

[0002]

2. Description of the Related Art When constructing a pipeline system by using a thermoplastic resin pipe, a pipe-to-pipe connection and a pipe-to-pipe connection must be performed according to the following method.
Conventionally, mechanical joining using plug-in joints or flanges has been the mainstream. However, the plug-in type has a problem in that the plug-in comes off during an earthquake, and the reliability as a connection structure is low.

In order to solve such a problem,
A fusion method that can integrally form a pipe has been put to practical use. However, in the electric fusion or butt fusion used in the conventional fusion method, in the case of the electric fusion using a joint having a built-in heating element, the heating element generates heat and the joint side expands, so that the pipe and the pipe are connected. After contact
Heat is transferred by heat transfer. However, since the heat conductivity of the pipe and the thermoplastic resin constituting the joint is low, when the pipe is melted by heat transfer, heat must be continuously supplied for a long time, resulting in low productivity and high cost. Leads to. It cannot be applied to those using a crosslinked resin. There was such a problem.

[0004] Therefore, a plurality of continuous sections (corresponding to the piping material in the present invention) are divided into a central portion having an inner diameter smaller than the outer diameter of the continuous section and two central portions having an inner diameter substantially larger than the central portion. Melt joining the sleeve means and the continuous section by inserting the sleeve means into the end of the sleeve means (corresponding to a joint in the present invention) having the end and rotating the sleeve means relative to the continuous section;
So-called "friction welding" has been proposed (Japanese Patent Application Laid-Open No. Hei 8-504).
922). By doing so, the conduit can be formed integrally.

[0005]

However, in the above-mentioned method, if the inner diameter of the central portion of the sleeve means is substantially equal to the outer diameter of the continuous section, sufficient frictional heat is not generated, resulting in poor adhesion. This may occur. Also,
If the inner diameter of the central portion of the sleeve means is too small than the outer diameter of the continuous section, it will take too much force to insert until the end face of the continuous section abuts the inner surface of the sleeve, and therefore the force required for frictional joining will be too great. This leads to problems such as an increase in the size of the device and an increase in cost.

When the diameter of a continuous section to be joined is small, even if the force required for insertion is not so large, the stress generated on the friction joining surface is still large, resulting in overheating, tube swelling, buckling, etc. And the problem is that sufficient bonding strength cannot be obtained.

[0007] The present invention solves the above-mentioned problems, and provides a method for connecting thermoplastic resin piping material that can easily insert the piping material sufficiently into the joint and, as a result, obtain sufficient joint strength. With the goal.

[0008]

The method for connecting a thermoplastic resin pipe according to the present invention is a method for connecting a thermoplastic resin pipe to join a pipe and a joint via a connecting member. The inner circumference whose maximum inner diameter is slightly larger than the outer diameter of the connection part of the connection member and is gradually reduced in diameter toward the inside of the joint while fitting the pipe member to the connection part of the connection member having an inner diameter slightly smaller than the outer diameter. A joining end portion having a surface, a connecting member connecting portion having an inner diameter slightly smaller than the outer diameter of the connecting portion of the connecting member, and a tubular portion having an inner diameter substantially equal to the inner diameter of the piping material are arranged in this order. The connecting portion of the connecting member is inserted into the connecting end of the provided joint, and the pipe member and the connecting member, and the connecting member and the joint are melted and joined together by friction.

The pipe material used in the present invention is usually a straight pipe, but may be a joint such as a socket, a sleeve, a cheese, a reducer (increaser), a header or a cap.

The thermoplastic resin constituting the above-mentioned piping material is not particularly limited as long as it is a resin which softens when heated and exhibits plasticity. Examples thereof include medium density polyethylene, high density polyethylene, ultra high molecular weight polyethylene, crosslinked polyethylene, and polypropylene. Olefin resins such as polybutene; general-purpose resins such as polyvinyl chloride; and engineering plastics such as polyphenylene sulfide. In particular, there is no suitable adhesive, it is suitably used for olefin-based resins in which a bonding means by fusion is adopted, and especially, ultra-high-molecular-weight polyethylene, which has a low fluidity even above the melting point,
It is suitably used for crosslinked polyethylene.

The joint used in the present invention includes:
Sockets, sleeves, cheeses, reducers (increasers), headers, caps, and the like.

The joint and the joining member used in the present invention are made of the same thermoplastic resin as the pipe material.

The connecting member used in the present invention has an inner diameter slightly smaller than the outer diameter of the piping material. If the inner diameter of the connection portion of the connection member is too small, it becomes difficult to insert the pipe member, and if it is too large, the joining strength between the pipe member and the connection member becomes low. The outer diameter is 0.1 mm from the inner diameter of the connection part of the joining member.
It is preferable that the size is increased by 1 to 2 mm.

The joint used in the present invention has a maximum inner diameter slightly larger than the outer diameter of the connecting portion of the connecting member, and has a joint end portion having an inner peripheral surface which gradually decreases in diameter toward the inside of the joint, and A connecting member connecting portion slightly smaller than the outer diameter of the connecting portion and having a constant inner diameter, and a tubular portion having an inner diameter substantially equal to the inner diameter of the piping material are provided in this order.

[0015] The outer diameter of the connecting portion of the connecting member may be as defined in claim 2.
As described in above, when the outer diameter of the connecting portion of the pipe member or the connecting member is 40 mm or less, it is preferable that the inner diameter of the connecting member is 0.1 to 2 mm larger than the inner diameter of the connecting member.

If the difference between the outer diameter of the connecting portion of the connecting member and the inner diameter of the connecting portion of the joint, and the difference between the outer diameter of the piping material and the inner diameter of the connecting portion of the connecting member are too small, frictional joining will occur. If the pressure applied to each joint surface is insufficient, and if the difference between them is too large, the connecting portion of the connecting surface material is inserted into the connecting member connecting portion of the joint, and the piping material is inserted into the connecting portion of the joining member. Becomes difficult.

Further, when the outer diameter of the connecting portion of the connecting member is 40 mm or less, the inner diameter of the connecting portion of the connecting member may be smaller than the outer diameter of the connecting portion of the connecting member. It is preferable that the width is made 2 mm or more and the ratio is 3 times or less.

The difference between the outer diameter of the connecting portion of the connecting member and the inner diameter of the connecting portion of the connecting member (that is, the difference between the thickness of the connecting portion of the connecting member and the thickness of 2).
If the ratio is too small, the strength of the joining member is insufficient during friction joining, and the joining member is likely to be torn,
If the ratio of the outer diameter of the connecting portion of the connecting member to the inner diameter of the connecting portion of the connecting member is too large, the shearing rates of the piping material and the connecting member, and the friction between the connecting member and the joint, are too different from each other. Therefore, sufficient bonding strength may not be obtained.

The above-mentioned joint is, as described in claim 4,
It is preferable to use a member provided with a pipe member connecting portion having an inner diameter substantially equal to the outer diameter of the pipe member between the connecting member connecting portion and the cylindrical portion.

By using such a joint, when the pipe material is inserted into the joint via the connecting member, the pipe material and the joint can be brought into close contact with each other, and the resin melted during the friction joining is applied to the inner surface of the pipe material. Outflow can be prevented. In this case, by setting the pipe material connecting portion of the joint to a predetermined length, even if the end surface of the pipe material is cut obliquely,
The piping material and the joint can be closely adhered.

In the method for connecting a thermoplastic resin pipe material of the present invention, a connecting portion of a connecting member is inserted into a joint end of the joint,
The pipe member and the joint member, and the joint member and the joint are melted and joined together by friction.

The above-mentioned method of friction may be based on rotational movement or vibration. In particular, piping materials and joining members,
And in order to simultaneously rub the joining member and the joint, it is preferable to rotate or vibrate the joining member.

In the friction joining in the present invention, as described in claim 5, it is preferable that after the friction is started, the friction is continued until the end of the pipe material comes into contact with the tubular portion of the joint. That is, the pipe member is inserted into the joining member to the extent that its end does not contact the tubular portion of the joint, and contacts the tubular portion.

As described above, the connecting portion of the connecting member has an inner diameter slightly smaller than the outer diameter of the pipe member, and the connecting member connecting portion of the joint is made slightly smaller than the outer diameter of the connecting portion of the connecting member. I have. Therefore, at the time of starting friction, in order to insert until the end of the pipe material contacts the tubular portion of the joint,
This is because an excessive surface pressure is required.

However, if it takes a long time before the end of the pipe material comes into contact with the tubular portion of the joint after the friction is started, the resin melted by the friction flows out to the inner surface of the pipe material, and the pipe becomes narrow. In some cases, it may be blocked or closed, and the bonding strength may be low. Therefore, it is preferable that the time until the end of the pipe material contacts the tubular portion of the joint is 2 seconds or less.

In the present invention, when the pipe member is inserted into the joint member and the joint member is inserted into the joint, the pipe member, the connection member, and the joint are fitted to each other without any gap. Is preferred. This is because when such a gap exists, the molten resin flows out into the gap during frictional joining, which may reduce the joining strength or cause sink marks after joining.

In order to eliminate the gap, for example, the connecting member may be provided with a projection for closing the gap.

(Function) The method for connecting a thermoplastic resin pipe material of the present invention is a method for connecting a thermoplastic resin pipe material for joining a pipe material and a joint via a connecting member, wherein the outer diameter of the pipe material is While fitting the pipe member to the connection part of the connection member having a slightly smaller inner diameter, the maximum inner diameter is slightly larger than the outer diameter of the connection part of the connection member, and the inner peripheral surface that gradually decreases in diameter toward the inside of the joint is formed. A connecting end portion having a connecting member having a fixed inner diameter slightly smaller than the outer diameter of the connecting portion of the connecting member, and a tubular portion having an inner diameter substantially equal to the inner diameter of the piping material are provided in this order. The joint of the connecting member is inserted into the joint end of the joint, and the pipe member and the joint member, and the joint member and the joint are fused with each other by friction, so that the pipe member can be easily formed. It can be fully inserted inside the fitting, and as a result, It is possible to obtain the engagement strength.

In the present invention, the outer diameter of the connecting portion of the pipe member or the connecting member is 40 mm or less, and the outer diameter of the connecting portion of the connecting member is the inner diameter of the connecting member connecting portion of the joint. 0.1 to 2 mm larger, the outer diameter of the pipe material is 0.1 to 2 mm larger than the inner diameter of the connecting portion of the joining member, sufficient pressure is applied to each joining surface during friction joining, The connecting portion of the connecting face member can be easily inserted into the connecting member connecting portion of the joint, and the piping material can be easily inserted into the connecting portion of the connecting member.

In the present invention, the outer diameter of the connecting portion of the pipe member or the connecting member is 40 mm.
Hereinafter, the outer diameter of the connecting portion of the connecting member is set to be larger than the inner diameter of the connecting portion of the connecting member by 2 mm or more, and the ratio is 3
If the ratio is not more than twice, the strength of the joining member is sufficient and the joining strength is high.

Further, in the present invention, as described in claim 4, a pipe member having an inner diameter substantially equal to the outer diameter of the pipe member between the connection member connecting portion and the cylindrical portion. By using the joint provided with the connection portion, when the pipe material is inserted into the joint via the connection member, the pipe material and the joint can be brought into close contact with each other, and the resin melted during the friction joining is applied to the inner surface of the pipe material. Outflow can be prevented.

Further, in the present invention, as described in the fifth aspect, after the friction is started, the friction is continued until the end of the pipe material comes into contact with the tubular portion of the joint, so that sufficient joint strength is obtained. Can be obtained.

Furthermore, in the present invention, when the pipe member is inserted into the joint member and the joint member is inserted into the joint, the pipe member, the connection member, and the joint are fitted to each other without gaps. When they are combined, there is no decrease in joining strength or no sink marks after joining.

[0034]

The present invention will be described below in more detail with reference to examples. (Example 1) Outer diameter d ₁ = 30 mm and length L ₁ shown in FIG.
= 60 mm joint 1 (made of cross-linked polyethylene, joint end 1
1, the maximum inner diameter d ₂ = 25 mm, the length L ₂ = 6 mm, the inner diameter d ₃ of the connecting member connecting portion 12 = 23.2 mm, and the length L ₃ = 6 m
m, the inner diameter d ₄ of the piping material connection portion 13 = 16.5 mm, the length L ₄ = 3 mm, the inner diameter d ₅ of the tubular portion 14 = 12.5 mm),
Maximum outer diameter d ₆ = 30 mm and length L ₅ = 23 m shown in FIG.
m connection member 2 (made of high-density polyethylene, d ₇ = 20 m
m, d ₈ = 17.5 mm, inner diameter d _{9 of} connection portion 21 = 16.
5 mm, outer diameter d ₁₀ of connection portion 21 = 23.7 mm, length L
₆ = 13 mm, L ₇ = 2 mm, L ₈ = 7 mm, L ₉ = 2 m
m, L ₁₀ = 12 mm, L ₁₁ = 0 mm), and as shown in FIG. 3, a straight pipe made of cross-linked polyethylene (manufactured by Sekisui Chemical Co., Ltd., trade name “ESLOVEX 13”) as the piping material 3.
A ", outer diameter 17mm, wall pressure 1.9mm, length 300m
m) was inserted into the connecting member 2 with a force of 350 N, and the connecting portion 21 of the connecting member 2 was inserted into the connecting member connecting portion 12 from the joint end 11 of the joint 1 with a force of 600 N.

After 5 seconds in this state, the connecting member 2 is
Rotate at a rotation speed of 3 rpm for 3 seconds, then accelerate the rotation speed of the joining member 2 to 1000 rpm and rotate for 5 seconds, stop rotation, cool for 2 minutes, and cool the straight pipe 3 and the joining member 2, The joining member 2 and the joint 1 were fused to each other by friction and joined.

(Embodiment 2) As the joining member 2, d₆= 3
0 mm, d₇= 16mm, d₈= 13.2 mm, d₉= 1
2.5mm, d_Ten= 23.7 mm, d₁₁= 16.5m
m, L_Five= 23mm, L₆= 13mm, L₇= 2mm, L₈
= 14mm, L₉= 2mm, L_Ten= 5mm, L ₁₁= 3m
m, and pipe material 3 made of cross-linked polyethylene
Tube (manufactured by Sekisui Chemical Co., Ltd., trade name "ESOVEX 10
A ", outer diameter 13 mm, wall pressure 1.4 mm, length 300 m
m) In the same manner as in Example 1 except that
The straight pipe 3 and the joint member 2 and the joint member 2 and the joint 1 are
They were melted together by rubbing and joined.

(Example 3) The procedure was carried out except that the force for inserting the straight pipe 3 into the connecting member 2 and the force for inserting the connecting portion 21 of the connecting member 2 from the joint end 11 of the joint 1 into the connecting member connecting portion 12 were 100 N. In the same manner as in Example 1, the straight pipe 3 and the joining member 2 and the joining member 2 and the joint 1 were melted and joined together by friction.

(Embodiment 4) As the joint 1, d ₁ = 30 m
m, d ₂ = 25 mm, d ₃ = 23.2 mm, d ₅ = 12.
5 mm, L ₁ = 60 mm, L ₂ = 6 mm, L ₃ = 6 mm,
L ₄ = except for using 0mm ones in the same manner as in Example 1, the straight pipe 3 and the joining member 2, and is melted to each other by friction and joining member 2 and the joint 1, were joined.

(Embodiment 5) As the joining member 2, d ₆ = 3
0 mm, d ₇ = 16 mm, d ₈ = 13.2 mm, d ₉ = 1
2.5 mm, d ₁₀ = 23.7 mm, L ₅ = 23 mm, L ₆
= 13 mm, L ₇ = 2 mm, L ₈ = 11 mm, L ₉ = 2 m
m, L ₁₀ = 8 mm and L ₁₁ = 0 mm, except that the straight pipe 3 and the joining member 2 were rubbed with each other, and the joining member 2 and the joint 1 were rubbed with each other in the same manner as in Example 1. Fused and joined. In addition, the straight pipe 3 is used as the connecting member 2,
When the connecting portion 21 of the connecting member 2 was inserted into the connecting member connecting portion 12 from the joint end 11 of the joint 1, a gap was generated between the straight pipe 3, the connecting member 2, and the joint 1.

(Embodiment 6) As the joining member 2, d ₆ = 3
0 mm, d ₇ = 20 mm, d ₈ = 17.5 mm, d ₉ = 1
6.5 mm, d ₁₀ = 23.25 mm, L ₅ = 23 mm,
L ₆ = 13 mm, L ₇ = 2 mm, L ₈ = 7 mm, L ₉ = 2 m
m, L ₁₀ = 12 mm and L ₁₁ = 0 mm, except that the straight pipe 3 and the joining member 2 were rubbed, and the joining member 2 and the joint 1 were rubbed with each other. Fused and joined.

(Embodiment 7) As the joining member 2, d ₆ = 3
0 mm, d ₇ = 20 mm, d ₈ = 17.5 mm, d ₉ = 1
6.5 mm, d ₁₀ = 25.2 mm, L ₅ = 23 mm, L ₆
= 13 mm, L ₇ = 2 mm, L ₈ = 7 mm, L ₉ = 2 m
m, L ₁₀ = 12 mm and L ₁₁ = 0 mm, except that the straight pipe 3 and the joining member 2 were rubbed, and the joining member 2 and the joint 1 were rubbed with each other. Fused and joined.

(Embodiment 8) As the joining member 2, d ₆ = 3
0 mm, d ₇ = 20 mm, d ₈ = 17.5 mm, d ₉ = 1
6.95 mm, d ₁₀ = 23.7 mm, L ₅ = 23 mm,
L ₆ = 13 mm, L ₇ = 2 mm, L ₈ = 7 mm, L ₉ = 2 m
m, L ₁₀ = 12 mm and L ₁₁ = 0 mm, except that the straight pipe 3 and the joining member 2 were rubbed, and the joining member 2 and the joint 1 were rubbed with each other. Fused and joined.

(Embodiment 9) As the joining member 2, d ₆ = 3
0 mm, d ₇ = 20 mm, d ₈ = 17.5 mm, d ₉ = 1
4.8 mm, d ₁₀ = 23.7 mm, L ₅ = 23 mm, L ₆
= 13 mm, L ₇ = 2 mm, L ₈ = 7 mm, L ₉ = 2 m
m, L ₁₀ = 12 mm and L ₁₁ = 0 mm, except that the straight pipe 3 and the joining member 2 were rubbed, and the joining member 2 and the joint 1 were rubbed with each other. Fused and joined.

(Embodiment 10) As the joint 1, d ₁ = 30
mm, d ₂ = 19.3 mm, d ₃ = 17.5 mm, d ₄ =
16.5 mm, d ₅ = 12.5 mm, L ₁ = 60 mm, L
₂ = 6 mm, L ₃ = 6 mm, L ₄ = 3 mm, and d ₆ = 30 mm, d ₇ = 20 mm, d ₈ = 17.5 as the joining member 2
mm, d ₉ = 16.5 mm, d ₁₀ = 18.0 mm, L ₅ =
23 mm, L ₆ = 13 mm, L ₇ = 2 mm, L ₈ = 7 m
m, L ₉ = 2 mm, L ₁₀ = 12 mm, and L ₁₁ = 0 mm, except that a straight pipe 3 and a joint member 2 and a joint member 2 and a joint 1 were formed in the same manner as in Example 1. They were melted together by friction and joined.

(Embodiment 11) As the joint 1, d ₁ = 50
mm, d ₂ = 41.3 mm, d ₃ = 39.5 mm, d ₄ =
16.5 mm, d ₅ = 12.5 mm, L ₁ = 60 mm, L
₂ = 6 mm, L ₃ = 6 mm, L ₄ = 3 mm, and as the joining member 2, d ₆ = 50 mm, d ₇ = 16 mm, and d ₈ = 13.2
mm, d ₉ = 12.5 mm, d ₁₀ = 40.0 mm, d ₁₁
= 16.5 mm, L ₅ = 23 mm, L ₆ = 13 mm, L ₇
= 2 mm, L ₈ = 11 mm, L ₉ = 2 mm, L ₁₀ = 5 m
The straight pipe 3 and the joining member 2 and the joining member 2 and the joint 1 were melted and joined to each other by friction in the same manner as in Example 2 except that m and L ₁₁ = 3 mm were used. .

(Comparative Example 1) As the joint 1, d ₁ = 30 m
m, d ₂ = 25 mm, d ₃ = 23.2 mm, d ₄ = 16.
5 mm, d ₅ = 12.5 mm, L ₁ = 60 mm, L ₂ = 1
2 mm, L ₃ = 0 mm, L ₄ = 3 mm, and d ₆ = 30 mm, d ₇ = 20 mm, d ₈ = 17.5 m as the joining member 2
m, d ₉ = 16.5 mm, d ₁₀ : maximum 25.5 mm, minimum 23.7 mm taper, L ₅ = 23 mm, L ₆ = 13
mm, L ₇ = 2 mm, L ₈ = 7 mm, L ₉ = 2 mm, L ₁₀
= 12 mm and L ₁₁ = 0 mm in the same manner as in Example 1, except that the straight pipe 3 is used as the connecting member 2, and the connecting portion 21 of the connecting member 2 is connected from the joint end 11 of the joint 1 to the connecting member. Although inserted into the connection portion 12, the connection member 2 could not be completely inserted into the joint 1.

(Comparative Example 2) As the joint 1, d₁= 30m
m, d_Two= 25mm, d_Three= 25mm, d_Four= 16.5m
m, d_Five= 12.5mm, L₁= 60mm, L_Two= 12m
m, L_Three= 0mm, L _Four= 3 mm, d as the joining member 2
₆= 30mm, d₇= 20 mm, d₈= 17.5 mm, d₉
= 16.5 mm, d_Ten= 25.5mm, L_Five= 23m
m, L₆= 13mm, L₇= 2mm, L₈= 7mm, L₉=
2mm, L_Ten= 12mm, L₁₁= 0mm
Except for this, the straight pipe 3 is connected to the connecting member 2 in the same manner as in the first embodiment.
Then, the connecting portion 21 of the connecting member 2 is connected to the joint end 11 of the joint 1.
The connecting member 2 was
1 could not be completely inserted.

(Evaluation) Straight pipe 3 connected in Examples 1 to 11
The connection between the connection member 2 and the joint 1 was subjected to a hot internal pressure test in accordance with JIS K6787, and the time until water leaked from the joint at an internal pressure of 1.3 MPa was measured. The time was 50 to 100 hours for those of Examples 3 to 11.

[0049]

According to the method for connecting a thermoplastic resin pipe material of the present invention, since the structure is as described above, the pipe material can be easily inserted into the joint easily at the time of friction joining, and as a result, High joining strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a joint used in an embodiment of the present invention.

FIG. 2 is a sectional view showing a connecting member used in the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state where a straight pipe, a connecting member, and a joint are connected in the embodiment of the present invention.

[Explanation of symbols]

1 coupling 2 connecting member design procedure control unit 3 piping materials (straight tubes) 11 connecting portion d ₁ joint maximum inner diameter d ₃ connecting member connecting the mating ends 12 connecting member connecting portion 13 a pipe member connection portion 14 cylindrical portion 21 connecting member the outer diameter of the connecting portion of the outside diameter d ₁₀ connection member of the connection portion of the part inside diameter d ₆ connecting member

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H019 GA06 4F211 AA04 AD05 AD12 AG08 AH11 AH43 TA01 TC07 TC11 TD11 TH18 TN20

Claims (6)

[Claims] 1. A method of connecting a thermoplastic resin piping material to join a piping material and a joint via a connecting member, wherein the piping material is connected to a connecting portion of the connecting member having an inner diameter slightly smaller than an outer diameter of the piping material. While fitting the material, the maximum inner diameter is slightly larger than the outer diameter of the connecting portion of the connecting member, and the joining end portion having an inner peripheral surface that gradually decreases in diameter toward the inside of the joint, and the outer diameter of the connecting portion of the connecting member A connecting portion of the connecting member is inserted into a joint end of a joint in which a connecting member connecting portion having a slightly smaller and constant inner diameter and a tubular portion having an inner diameter substantially equal to the inner diameter of the pipe material are provided in this order. A method of connecting a thermoplastic resin pipe material, wherein the pipe material and the joint member, and the joint member and the joint are melted and joined together by friction. 2. An outer diameter of a connecting portion of a pipe member or a connecting member is 40.
mm or less, the outer diameter of the connecting portion of the connecting member is made 0.1 to 2 mm larger than the inner diameter of the connecting member connecting portion of the joint, and the outer diameter of the piping material is 0.1 to more than the inner diameter of the connecting portion of the connecting member. 2m
The method for connecting thermoplastic resin tubes according to claim 1, wherein the length is set to m. 3. An outer diameter of a connecting portion of a pipe member or a connecting member is 40.
3 mm or less, the outer diameter of the connecting portion of the connecting member is made 2 mm or more larger than the inner diameter of the connecting portion of the joining member, and the ratio is 3 times or less. Connection method of thermoplastic resin tube. 4. A joint provided between said connecting member connecting portion and said cylindrical portion, further comprising a piping material connecting portion having an inner diameter substantially equal to the outer diameter of said piping material. The method for connecting a thermoplastic resin tube according to any one of claims 1 to 3. 5. The thermoplastic resin according to claim 1, wherein after the friction is started, the friction is continued until the end of the pipe material comes into contact with the tubular portion of the joint. How to connect tubing. 6. The pipe member, the connecting member, and the joint are fitted to each other without a gap when the pipe member is inserted into the joint member and the joint member is inserted into the joint. The method for connecting a thermoplastic resin tube according to any one of claims 1 to 5.