JPH09203493A - Pipe joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint structure which can carry out a temperature insulation construction work simultaneously with a pipe line construction work, which can reduce internal pressure loss of the pipe line, which can prevent foreign matter from being caught in the case of a drain pipe, and which can be manufactured by the use of simple molding dies with a less cost. SOLUTION: In a pipe line joint structure in which an adapter 3 having one end side plug connected to a receptacle 21 of a joint 2, and the other end receptacle provided through a step part 31 and connected thereto with a pipe body 1 is incorporated, the inner peripheral surface 3a of the plug side of the adapter 3 is flush with the inner peripheral surface 1a of the pipe body 1 with no height difference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pipe joint structure provided with a foamed layer on the outer periphery for keeping cold and keeping heat used for supplying and draining pipes of a building.

[0002]

2. Description of the Related Art Conventionally, in order to prevent deterioration of the cold insulation effect and prevention of rust and decay of wet buildings, the requirements for quality of water supply and drainage pipes installed in buildings have been raised. As a countermeasure against this dew condensation, a so-called cold insulation / heat insulation work is performed by mounting a heat insulating material such as glass wool on the outer periphery of the pipe after the pipe.

On the other hand, in place of the conventional cold / heat-retaining method as described above, as an advanced method, a vinyl chloride resin or the like is used, and a pipe or joint integrally formed with a foam layer is used to form a pipe. There is also a proposal that cold insulation and heat insulation will be completed at the same time as the construction. For example, as examples of the above, Japanese Patent Laid-Open Nos. 6-100977 and 6-23
No. 1233 is cited.

[0004]

However, in the case of using a pipe or joint in which the foam layer is integrally formed as described above, it is preferable that the inner diameter of the pipe and the inner diameter of the joint are the same, but the inner diameter is different. There is a problem that there is a step on the connecting surface of the inner circumference and pressure loss due to turbulent flow etc. in the case of water supply / drainage pipe, and foreign matter is caught in the case of drainage pipe etc. .

Further, if there is a step between the inner peripheral surface of the insertion port of the adapter and the inner peripheral surface of the tube, water penetrates through this step and the cross-sectional effect, which is an effect of the foam layer of the tube, There is a problem that a problem such as a decrease in sound insulation effect occurs.

That is, in the above-mentioned JP-A-6-100977, no consideration is given to the inner diameters of the pipe and the joint, and in JP-A-6-231233, the inner core portion has a small inner diameter. Therefore, there is a problem that pressure loss occurs.

Further, although these prior arts have a foamed vinyl chloride resin layer for keeping cold and warm, this molding requires large-scale equipment such as an injection molding machine and an injection molding die. There's a problem.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to solve these problems and to perform heat insulation or cold insulation work simultaneously with piping work. In addition, the cross-section effect and sound insulation effect do not decrease, there is little pressure loss inside the pipe, and in the case of a drainage pipe, foreign matters are not caught, and it is possible to use a simple molding die for many The present invention provides a pipe joint structure that can be realized without cost.

[0009]

According to the pipe joint structure of the present invention as set forth in claim 1, the insertion port on one end side is connected to the receiving port of the joint, and the receiving port on the other end side is provided through the step portion. A pipe joint structure provided with an adapter to which a pipe is connected, characterized in that the inner peripheral surface of the insertion side of the adapter is flush with the inner peripheral surface of the pipe. And

Further, in the pipe joint structure of the present invention according to claim 2, the outer layer of the pipe body according to claim 1 is a foam layer.

The above-mentioned adapter is used by interposing between the joint and the pipe, and various shapes are possible,
The material is preferably made of synthetic resin, which has a lower thermal conductivity than metal, and is suitable for mass production because of its moldability.

The types of joints used are DV joints and TS joints.
Existing joints such as joints and fusion splices are preferred because they are easily available, but they may have the same inner diameter. An inner core type joint can also be used. The shape of the joint can be used without restriction such as socket, cheese, elbow, reducer, valve socket, and valve type (may have a different diameter).

As a foam layer for keeping cold and heat provided in the joint, a foamed material such as urethane resin, polyethylene resin, vinyl chloride resin is preferable, but especially urethane resin is capable of foaming at room temperature and has excellent moldability. Therefore, it is more preferable.

[0014]

In the pipe joint structure of the present invention as defined in claim 1, the insertion port on one end side is connected to the receiving port of the joint, and the pipe body is connected to the receiving port on the other end provided via the step portion. A pipe joint structure with an adapter attached, wherein the inner peripheral surface on the insertion opening side of the adapter has no step with the inner peripheral surface of the pipe body,
Since it is formed in the same plane, it is possible to construct a foam layer for heat insulation or cold insulation at the same time as piping work, there is little pressure loss inside the pipe, and in the case of a drainage pipe, foreign matters are not caught, In addition, piping can be done without much expense by using a simple mold.

Further, in the pipe joint structure of the present invention as set forth in claim 2, since the outer layer of the pipe body is a foamed layer, the cross-sectional effect and the sound insulation effect are not deteriorated.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a half sectional view showing an example of the pipe joint structure of the present invention. The pipe joint structure of the present invention basically has a pipe end 11 of a connecting portion of a pipe 1 as shown in FIG.
And a receiving port 21 of the joint 2 at the corner, an adapter 3 for connection is interposed.

More specifically, the inner peripheral surface 1a of the pipe 1 and the joint 2
An inner peripheral surface 3a is formed that smoothly connects the inner peripheral surface 2a of the pipe 2 without any steps, and the end surface 2b of the receiving port 21 of the joint 2 and the pipe 1
The adapter 3 provided with the step portion 31 facing or abutting the end surface of the pipe 2 is provided from the inner peripheral surface 21a of the receiving port 21 of the joint 2 through the step portion 31 to the outer periphery of the pipe end 11 of the pipe 1. It has a structure in which it is attached to the outer peripheral surface of the foam layer 4 made of urethane foam resin.

A foam layer 5 provided on the outer periphery of the joint 2
End face 5a of the adapter 21 and the end face 3b of the step portion 31 of the adapter 3 that abuts the end face 5a of the receiver 21 side.
There is no step between and and the structure is almost flush.

A filler 6 is filled in the gap formed between the tube end 11 of the tube 1 and the step 31 of the adapter 3.

As described above, in the pipe joint structure of the present invention, as shown in FIG. 1, when there is no difference in inner diameter between the inner peripheral surface 1a of the pipe 1 and the inner peripheral surface 2a of the joint 2. Is an ideal connection. On the other hand, temporarily, the inner peripheral surface 1a of the pipe 1 and the joint 2
In the case where a step is generated between the inner peripheral surface 2a of the pipe 2 and the inner peripheral surface 2a of the pipe 1, for example, as shown in FIG. Even if there is a step due to the difference in the aperture between the two, it is possible to connect smoothly without any step by providing a linear gradient on the inner peripheral surface 3a of the adapter 3.

Similarly, as shown in FIG. 3, when a step due to the difference in inner diameter occurs between the inner peripheral surface 1a of the pipe 1 and the inner peripheral surface 2a of the joint 2, that is, the joint 2 Inner surface 2
By providing a curved gradient on the inner peripheral surface 3a of the adapter 3, even if a step is generated between the a and the inner peripheral surface 1a of the tube end 11 of the tube 1 due to the difference in diameter, There is no step and you can connect smoothly.

Further, the shape of the adapter 3 can be variously changed depending on the type of joint, the fusion of the joint, and the TS method, and can be arbitrarily designed without departing from the scope of the present invention. Is.

[0023]

In the pipe joint structure of the present invention as set forth in claim 1, the insertion port on one end side is connected to the receiving port of the joint, and the pipe body is connected to the receiving port on the other end provided through the step portion. It is a pipe joint structure with an attached adapter, and the inner peripheral surface on the insertion side of the adapter is flush with the inner peripheral surface of the pipe body, so it is warm at the same time as the piping work. Or, it is possible to construct a foam layer for keeping cold, there is little pressure loss inside the pipe, and in the case of a drainage pipe, foreign matters do not get caught, and it costs a lot of money just by using a simple mold. Plumbing is possible without hanging.

Further, in the pipe joint structure of the present invention as defined in claim 2, since the outer layer of the pipe body is a foam layer, the cross-sectional effect and the sound insulation effect are not deteriorated.

More specifically, when used in water supply and hot water supply pipes, the pressure drop is small, and it is possible to pipe a long distance with a pipe having the same inner diameter, or the pressure is low even at the same distance. Can be pumped.
Further, when applied to a drainage pipe, since there is no step at the connecting portion, foreign matters are not caught and smooth drainage can be performed.

By adopting a pipe joint structure using an adapter as in the present invention, the types of usable joints are increased, and it becomes possible to connect joints with different diameters to pipes.

Further, in the pipe joint structure having the cold insulation / heat insulation layer in the prior art, one or two injection molding dies for each joint were required for each kind, but the existing joint and adapter were used. By adopting the pipe joint structure of the present invention, it is possible to cope with each nominal diameter receiving port with only one adaptor, management becomes easy, and the number of times of mold replacement in the injection molding process is reduced, thereby improving productivity. It has become possible to improve. Therefore, it is preferably used as a pipe joint structure.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an example of a pipe joint structure of the present invention.

FIG. 2 is a sectional view showing a main part of the pipe joint structure of the present invention.

FIG. 3 is a sectional view showing a main part of the pipe joint structure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 1a, 2a, 3a, 21a Inner peripheral surface 11 Pipe end 2 Joint 21 Receptacle 3 Adapter 31 Step part 2b, 3b, 5a End surface 4, 5 Foam layer 6 Filler

Claims (2)

[Claims] 1. A pipe joint structure in which an insertion port on one end side is connected to a receiving port of a joint, and an adapter for connecting a pipe body to a receiving port on the other end provided through a step portion is attached.
A pipe joint structure, wherein the inner peripheral surface of the adapter on the insertion side is flush with the inner peripheral surface of the tubular body. 2. A pipe joint structure, wherein the outer layer of the pipe body according to claim 1 is a foam layer.