JPH08285164A - Pipe header and its manufacture - Google Patents

Abstract

PURPOSE: To prevent a turbulent flow from being generated in a transport fluid, and reduce a flow rate loss in the transport fluid by friction by projecting a part of an outer peripheral surface except end parts in a main pipe, flatly forming a tip surface of its projecting part out of a thermoplastic resin pipe, and constituting branch pipes of short pipes fixed to the tip surface of the projecting part. CONSTITUTION: In a main pipe 1, a part of an outer peripheral surface is projected except both end parts, and a tip surface of its projecting part 11 is composed of a flatly formed single straight thermoplastic resin pipe 10. Screw holes 12 having the size almost equal to an outside diameter of short pipes 20 having a flange are formed in three places on a tip surface of the projecting part 11 of its thermoplastic resin pipe 10, and the short pipes 20 having a flange are screw-fitted to its screw holes 12, and flanges 21 are joined to the tip surface of the projecting part 11, and a pipe header H1 is manufactured. Therefore, a turbulent flow can be prevented from being generated in a transport fluid, and a flow rate loss in the transport fluid by friction can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe header suitable for use in residential pipes and pipes of chemical plants where various high temperature chemicals are transported.

[0002]

2. Description of the Related Art In residential piping, chemical plant piping, etc., when it is necessary to connect a plurality of branch pipes or a plurality of valves to the main pipe in a limited space. The tube header is used.

A conventional pipe header is manufactured by alternately connecting a plurality of branch pipe joints and short pipes,
The main pipe of the branch pipe joint and the short pipe constitute a main pipe of the pipe header, and the branch portion raised to the main pipe of the branch pipe joint constitutes a branch pipe of the pipe header. In the piping of a chemical plant, a resin composite pipe formed by using a thermoplastic resin pipe as a core material and providing a fiber reinforced thermosetting resin layer on the outer peripheral surface of the core material (see Japanese Utility Model Publication No. 6-24202). ) Is often used, and in such a case, a resin composite pipe is used for the short pipe that is the material of the pipe header, and a fiber-reinforced thermosetting resin layer is also provided on the surface of the branch pipe joint. , After connecting those short pipes and branch pipe fittings,
In order to reinforce the connecting portion, a fiber-reinforced thermosetting resin layer is further provided on the outer peripheral surface of the connecting portion.

Generally, the manufacturing operation of this tube header is
Since it is necessary to accurately set the position and angle of the branch pipes according to the situation of the construction site, the short pipes are sized and cut, and the short pipes are cut at the site.

[0005]

However, in such a conventional pipe header, since the main pipe of the pipe header is composed of the main pipe of the branch pipe joint and the short pipe, Irregularities are formed on the inner peripheral surface of the connection portion of the short pipe, and the irregularities cause turbulent flow in the transport fluid or increase the flow rate loss of the transport fluid due to friction. In addition, since bacteria tend to be generated due to the fluid remaining in the vicinity of the irregularities on the inner peripheral surface, it cannot be used as a pipe for transporting ultrapure water.

Further, in manufacturing this pipe header, the short pipe is sized for allocation, the short pipe is cut, and the short pipe and the branch pipe joint are connected (when a resin composite pipe is used for the short pipe, the short pipe is used). After cutting, the process of cutting out the fiber-reinforced thermosetting resin layer at both ends of the short pipe is added, and in addition to connecting the short pipe and the branch pipe joint, It requires a lot of steps such as a step of reinforcing with a curable resin layer), which is very troublesome.

Further, since the deviation between the axis of the main pipe of the branch pipe joint and the axis of the short pipe causes the bending of the axis of the main pipe, which directly affects the piping accuracy, high piping accuracy is ensured. In order to do so, it is necessary to perform the alignment of these axes very accurately, and the operator is required to have such skill.

Further, since a plurality of connecting portions are provided in the middle of the main pipe, in order to secure sufficient bending rigidity and pressure resistance, it is necessary to reinforce the connecting portions firmly.
It takes time and cost.

Further, since the main pipe and the short pipe of the branch pipe joint are arranged between the branch pipes, the branch pipes cannot be brought close to each other. That is, there is a problem that it is difficult to make the pipe header itself compact.

In view of the above problems, the present invention can prevent turbulent flow in the transport fluid and reduce the flow loss of the transport fluid due to friction. The first object is to provide a pipe header that can also be used as a pipe for transporting ultrapure water, and such pipe header can be manufactured to reduce manufacturing labor and manufacturing cost, and ensure pipe accuracy and strength. A second object of the present invention is to provide a manufacturing method capable of manufacturing a pipe header while making it compact.

[0011]

In order to achieve the above-mentioned first object, a pipe header according to claim 1 of the present invention comprises a main pipe and a main pipe which is spaced apart in the axial direction of the main pipe. In a pipe header composed of a plurality of branch pipes erected on the outer peripheral surface, a part of the outer peripheral surface of the main pipe protrudes except an end portion, and a tip surface of the protruding portion is formed flat. It is assumed that the branch pipe is made of a single thermoplastic resin pipe, and the branch pipe is made of a short pipe fixed to the tip end surface of the projecting portion. The pipe header according to claim 1, wherein a fiber-reinforced thermosetting resin layer is provided on the outer peripheral surface of the main pipe and the outer peripheral surface of the branch pipe.

Further, in order to achieve the second object,
In the method for manufacturing a pipe header according to claim 3 of the present invention, a thermoplastic resin pipe in which a part of the outer peripheral surface is projected and the tip surface of the protruding portion is formed flat, and a plurality of short pipes are used, A method was adopted in which the protruding portion at the end portion of the thermoplastic resin pipe was cut to make the end portion of the thermoplastic resin pipe cylindrical, and the plurality of short pipes were fixed to the tip surface of the remaining protruding portion.

In order to achieve the second object,
In the method of manufacturing the pipe header according to the present invention, a part of the outer peripheral surface is projected, and a thermoplastic resin tube in which the tip surface of the protruding portion is formed flat, and a plurality of short tubes are used, The projection of the end of the thermoplastic resin pipe is cut to make the end of the thermoplastic resin pipe cylindrical, and a fiber-reinforced thermosetting resin layer is provided on the outer peripheral surface of the portion excluding the end, The fiber-reinforced thermosetting resin layer provided on the tip surface of the protruding portion of the plastic resin pipe is cut by a size corresponding to the short pipe to provide a plurality of exposed portions of the thermoplastic resin pipe, and the thermoplastic resin A method of fixing the short pipe to each of the exposed portions and then providing a fiber-reinforced thermosetting resin layer on the outer peripheral surface of the flanged short pipe, the method of manufacturing a pipe header according to claim 5 of the present invention, Part of the surface protrudes, and the tip surface of the protrusion is formed flat. Using a thermoplastic resin pipe and a plurality of short pipes, the end portion of the thermoplastic resin pipe was made into a cylindrical shape by cutting the protruding portion of the end portion of the thermoplastic resin pipe, and the end portion was removed. Providing a fiber reinforced thermosetting resin layer on the outer peripheral surface of the part,
Providing a plurality of portions where the thermoplastic resin pipe is exposed by cutting the fiber-reinforced thermosetting resin layer provided on the tip surface of the protruding portion of the thermoplastic resin pipe by a size corresponding to the short pipe,
A method of fixing a short tube having a fiber-reinforced thermosetting resin layer provided on the outer peripheral surface in advance to each of the exposed portions of the thermoplastic resin was adopted.

[0014]

In the pipe header according to claim 1 of the present invention and the pipe header according to claim 2 of the present invention, since the main pipe is composed of one thermoplastic resin pipe, the inner peripheral surface of the main pipe is uneven. It has no smooth shape. Therefore, during use, turbulent flow can be prevented from occurring in the transport fluid, and the flow rate loss of the transport fluid due to friction can be reduced. Further, since there is no place where the fluid remains, it becomes difficult for germs to occur, so that it can be used as a pipe for transporting ultrapure water. Further, in the pipe header according to claim 2 of the present invention, since the fiber-reinforced thermosetting resin layer is provided on the outer peripheral surface of the main pipe and the outer peripheral surface of the branch pipe, bending rigidity, corrosion resistance, heat resistance, pressure resistance, Has excellent impact resistance.

When the pipe header according to claim 1 of the present invention is manufactured, the manufacturing method according to claim 3 of the present invention can be adopted.

That is, according to this method, since the pipe header can be manufactured by a small number of steps such as cutting the protruding portion at the end of the thermoplastic resin pipe and fixing the short pipe, manufacturing labor and manufacturing cost can be reduced. It can be easily achieved.

Further, since the straight header can be manufactured by using the straight thermoplastic resin pipe, the axial center of the main pipe can be straightened. Therefore, regardless of the skill level of the worker, high piping accuracy can be easily achieved. Can be secured.

Furthermore, if a thermoplastic resin tube having sufficient bending rigidity and pressure resistance is used, a tube header having sufficient bending rigidity and pressure resistance can be manufactured without any reinforcement work. It is possible to easily secure high strength without using labor and cost.

When fixing a plurality of short pipes to the thermoplastic resin pipe, the short pipes can be brought close to each other.
It is possible to make the pipe header compact by narrowing the interval between the branch portions.

When the pipe header according to claim 2 of the present invention is manufactured, the manufacturing method according to claim 4 of the present invention and the manufacturing method according to claim 5 of the present invention can be adopted.

That is, in the manufacturing method according to the fourth aspect and the manufacturing method according to the fifth aspect, cutting of the protruding portion at the end of the thermoplastic resin pipe, fiber-reinforced thermosetting resin for the thermoplastic resin pipe and the short pipe The pipe header can be manufactured in a few steps such as installation of layers, cutting of the fiber-reinforced thermosetting resin layer, and fixing of short pipes. Particularly, in the cutting step of the fiber-reinforced thermosetting resin layer, a hole punching machine is used. Since it is possible to use, it is possible to easily reduce manufacturing labor and manufacturing cost. Further, in the manufacturing method according to claim 5, since the short tube in which the fiber-reinforced thermosetting resin layer is provided on the outer peripheral surface in advance is fixed to the thermoplastic resin tube, the installation step of the fiber-reinforced thermosetting resin layer is performed. It can be done efficiently.

Further, in the manufacturing method according to the fourth aspect and the manufacturing method according to the fifth aspect, it is possible to manufacture the pipe header in which the axis of the main pipe is straight by using the straight thermoplastic resin pipe. Therefore, high piping accuracy can be easily ensured regardless of the skill level of the operator.

Furthermore, by using a thermoplastic resin tube having sufficient bending rigidity and pressure resistance, it is possible to manufacture a tube header having sufficient bending rigidity and pressure resistance without performing a reinforcing work. It is possible to easily secure high strength without using labor and cost.

Further, since the short tubes can be brought close to each other when fixing the plurality of short tubes to the thermoplastic resin tube,
It is possible to make the pipe header compact by narrowing the interval between the branch portions.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe header and a method of manufacturing the same according to an embodiment of the present invention will be described in detail below with reference to the drawings.

First, based on FIG. 1 and FIG.
The structure of the pipe header of the embodiment will be described. The pipe header of this embodiment has a structure corresponding to the pipe header described in claim 1 of the present invention.

FIG. 1 is a partially sectional front view showing a pipe header of this embodiment, and FIG. 2 is a sectional view taken along line II-II of FIG. 1. This pipe header H1 is a main pipe 1 and an axis of the main pipe 1. Three branch pipes 2, which are erected on the outer peripheral surface of the main pipe 1 at intervals in the direction 2.
It is composed of 2 and 2. The branch pipes 2, 2,
2 are all erected in the same direction.

The main pipe 1 is composed of a single straight thermoplastic resin pipe 10 in which a part of the outer peripheral surface of the main pipe 1 protrudes except for both ends thereof, and the end face of the protruding portion 11 is formed flat. ,
The projecting portion 11 is provided with three screw holes 12, 12, 12 penetrating the inside of the thermoplastic resin tube 10.

The branch pipe 2 is made of a thermoplastic resin, and has a flange 21 joined to the tip end surface of the projecting portion 11 of the main pipe 1 on the outer peripheral surface of the middle portion thereof.
It is composed of a flanged short tube 20 having a thread 22 that meshes with the thread of the screw hole 12 on the outer peripheral surface on the one end side.

That is, in the pipe header H1 of this embodiment,
Since the main pipe 1 is composed of one thermoplastic resin pipe 10, the inner peripheral surface of the main pipe 1 has a smooth shape without irregularities. Therefore, during use, turbulent flow can be prevented from occurring in the transport fluid, and the flow rate loss of the transport fluid due to friction can be reduced. Further, since there is no place where the fluid remains, it becomes difficult for germs to occur, so that it can be used as a pipe for transporting ultrapure water.

Next, a method of manufacturing the pipe header H1 of this embodiment will be described with reference to FIGS. 3 and 4. The manufacturing method of this embodiment corresponds to the manufacturing method according to claim 3 of the present invention.

When the pipe header H1 of this embodiment is manufactured, a thermoplastic resin pipe 10 (see FIG. 3) in which a part of the outer peripheral surface protrudes and the tip end surface of the protruding portion is formed flat.
And three flanged short pipes 20, 20, 20 having a flange 21 on the outer peripheral surface of the middle portion and a thread 22 on the outer peripheral surface on one end side of the flange 21. The thermoplastic resin tube 10 can be easily formed by extrusion molding. First, as shown in FIG. 4I, both ends of the thermoplastic resin pipe 10 are made into a cylindrical shape by cutting the protrusions 1 at both ends of the thermoplastic resin pipe 10. Then, as shown in (ii) of FIG. 4, a screw hole 1 in which the flanged short pipe 20 can be screwed into the tip surface of the remaining protruding portion 11
2 pieces are opened, and the short tube 20 with the flange is provided in each screw hole 12.
The flange 2 of the short tube 20 with the flange
1 is joined to the tip surface of the protruding portion 11 of the thermoplastic resin tube 10.

That is, according to this method, the pipe header H1 can be manufactured by a small number of steps such as cutting the protruding portions 11 at both ends of the thermoplastic resin pipe 10 and fixing the flanged short pipe 20 by screwing. It is possible to easily reduce manufacturing labor and manufacturing cost.

Further, by using the straight thermoplastic resin tube 10, the tube header H1 in which the axis of the main tube 1 is straight
Therefore, high piping accuracy can be easily secured regardless of the skill level of the operator.

Further, by using the thermoplastic resin pipe 10 having sufficient bending rigidity and pressure resistance, it is possible to manufacture the pipe header H1 having sufficient bending rigidity and pressure resistance without performing a reinforcing work. Therefore, it is possible to easily secure high strength without using labor and cost.

Further, three short pipes with flanges 20, 20,
20 flanges 21, 21 and 21 are attached to the thermoplastic resin pipe 10.
When fusion-bonding to the flange 21, the flanged short pipe 20, up to the position where the flanges 21, 21, 21 come close to or abut
Since the 20 and 20 can be brought close to each other, the interval between the branched portions 2, 2 and 2 can be narrowed and the pipe header H1 can be made compact.

Next, the structure of the pipe header of the second embodiment will be described with reference to FIG. The pipe header of this embodiment has a structure corresponding to the pipe header of claim 2 of the present invention.

FIG. 5 is a partially sectional front view showing the pipe header of this embodiment, and FIG. 6 is a VI-VI sectional view of FIG. 5, where the pipe header H2 is the main pipe 1 and the outer periphery of the main pipe 1. The main pipe 1 is composed of three branch pipes 2, 2 and 2 which are erected on the surface.
A fiber-reinforced thermosetting resin layer 3 (a layer in which glass fibers are impregnated with a thermosetting resin) is provided on the outer peripheral surface of and the outer peripheral surface of the branch pipe 2. Since the detailed configurations of the main pipe 3 and the branch pipe 2 are the same as those in the first embodiment,
The same reference numerals as those in the first embodiment are attached to the drawings and the description thereof is omitted. That is, in the pipe header H2 of the present embodiment, since the main pipe 1 is composed of one thermoplastic resin pipe 10, the main pipe The inner peripheral surface of No. 1 has a smooth shape without unevenness.
Therefore, during use, turbulent flow can be prevented from occurring in the transport fluid, and the flow rate loss of the transport fluid due to friction can be reduced. Further, since there is no place where the fluid remains, it becomes difficult for germs to occur, so that it can be used as a pipe for transporting ultrapure water. Further, since the fiber-reinforced thermosetting resin layer 3 is provided on the outer peripheral surface of the main pipe 1 and the outer peripheral surface of the branch pipe 2, the bending rigidity, corrosion resistance, heat resistance, pressure resistance and impact resistance are excellent.

Next, two methods of manufacturing the pipe header H2 of this embodiment will be described with reference to FIGS. 7 and 8. The manufacturing method (I) corresponds to the manufacturing method described in claim 4 of the present invention, and the manufacturing method (II) corresponds to the manufacturing method described in claim 5 of the present invention.

Manufacturing Method (I) In this method, a part of the outer peripheral surface is projected and the protruding portion 11 is formed.
Of a thermoplastic resin tube having a flat tip surface
And three flanged short pipes 20 each having a flange 21 on the outer peripheral surface of the middle portion and a thread 22 on the outer peripheral surface on one end side of the flange 21 (production of the first embodiment). Same method).

First, as shown in FIG. 7 (i), the projections 11 at both ends of the thermoplastic resin pipe 20 are cut to make both ends of the thermoplastic resin pipe 20 into a cylindrical shape. As shown in (ii) of 7, the fiber-reinforced thermosetting resin layer 3 is provided on the outer peripheral surface of the portion excluding both ends thereof. After that, in FIG.
As shown in (iii), the three locations of the fiber-reinforced thermosetting resin layer 3 provided on the tip surface of the projecting portion 11 of the thermoplastic resin tube 10 are connected to the flange 21 of the flanged short tube 20.
A portion 13 where the thermoplastic resin pipe is exposed by cutting with a punching machine by a size substantially equal to the above is provided, and the flanged short pipe 20 is screwed into each of the three thermoplastic resin exposed portions 13, 13, 13. The screw holes 12, 12, 12 which can be fitted are provided. Then, as shown in (iv) of FIG. 7, the flanged short pipe 20 is provided in each of the screw holes 12, 12, 12.
Is screwed to join the flange 21 of the flanged short tube 20 to the thermoplastic resin exposed portion 13, and thereafter,
As shown in (v) of FIG. 7, the fiber-reinforced thermosetting resin layer 3 is provided on the outer peripheral surface of the flanged short tube 20 and the surface of the flange 21. The installation work of the fiber-reinforced thermosetting resin layer 3 on the flanged short pipe 20 may be performed after the flanged short pipe 20 is connected to the branch side pipe.

Manufacturing Method (II) In this method, a part of the outer peripheral surface is projected and the protruding portion 11 is formed.
Of a thermoplastic resin tube having a flat tip surface
And three flanged short pipes 20 each having a flange 21 on the outer peripheral surface of the middle portion and a thread 22 on the outer peripheral surface on one end side of the flange 21 (production of the first embodiment). Same method).

First, the steps shown in (i) to (iii) of the manufacturing method (I) are performed (see (i) to (iii) in FIG. 8). Next, as shown in (iv) of FIG. 8, the fiber-reinforced thermosetting resin layer 3 is preliminarily provided on the outer peripheral surface in each of the screw holes 12 provided in the thermoplastic resin exposed portion 13 with the flange. Screwing the short pipe 20 to join the flange 21 of the short pipe 20 with the flange to the thermoplastic resin exposed portion 13;
Then, as shown in (v) of FIG. 8, the fiber-reinforced thermosetting resin layer 3 is provided on the surface of the flange 21 of the flanged short tube 20. In addition, the flange 21 of the short pipe 20 with a flange
The operation of installing the fiber-reinforced thermosetting resin layer 3 on the pipe may be performed after connecting the short pipe with flange 20 to the pipe on the branch side.

In the manufacturing method (I) and the manufacturing method (II), the fiber-reinforced thermosetting resin layer 3 may be provided by, for example, a thermoplastic resin pipe 10 and the flanged short pipe 20 with glass roving. After winding, the outer mold is attached to the outside of the thermoplastic resin pipe 10 and the flanged short pipe 20, and thermosetting is performed between the thermoplastic resin pipe 10 and the single flanged short pipe 20 and the outer mold. In addition to the method of pouring a solid resin to solidify the resin, after winding the glass roving around the thermoplastic resin tube 10 and the flanged short tube 20, a molten thermosetting resin is applied to the glass roving. A method of impregnating can be adopted.

That is, in the manufacturing method (I) and the manufacturing method (II), cutting of the protrusions 11 at both ends of the thermoplastic resin pipe 10 and fiber-reinforced thermosetting to the thermoplastic resin pipe 10 and the flanged short pipe 20. The pipe header H2 can be manufactured by a small number of steps such as installation of the resinous resin layer 3, cutting of the fiber-reinforced thermosetting resin layer 3, and fixing of the flanged short pipe 20, and particularly, the fiber-reinforced thermosetting resin layer. Since a drilling machine can be used in the cutting step of No. 3, it is possible to easily reduce manufacturing labor and manufacturing cost. Further, in the manufacturing method (II), the short tube 20 having the fiber-reinforced thermosetting resin layer 3 provided on the outer peripheral surface in advance is fixed to the thermoplastic resin tube 10. The step of installing the thermosetting resin layer 3 can be efficiently performed.

The production method (I) and the production method (I
In I), since the pipe header H2 in which the axial center of the main pipe 3 is straight can be manufactured by using the straight thermoplastic resin pipe 30, regardless of the skill level of the worker, high piping can be easily performed. Accuracy can be secured.

Furthermore, if the thermoplastic resin pipe 10 having sufficient bending rigidity and pressure resistance is used, the pipe header H2 having sufficient bending rigidity and pressure resistance can be manufactured without any reinforcement work. Therefore, it is possible to easily secure high strength without using labor and cost.

Also, the three short pipes with flanges 20, 20,
20 flanges 21, 21 and 21 are attached to the thermoplastic resin pipe 10.
When fusion-bonding to the flange 21, the flanged short pipe 20, up to the position where the flanges 21, 21, 21 come close to or abut
Since the 20 and 20 can be brought close to each other, the interval between the branched portions 2, 2 and 2 can be narrowed and the pipe header H2 can be made compact.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific structure is not limited to this embodiment, and there are design changes and the like within a range not departing from the gist of the present invention. Also included in the present invention. For example, although the pipe header in which the branch pipes are erected at three points of the main pipe is shown in the embodiment, the branch pipes may be erected at two or four or more points of the main pipe. Further, in the embodiment, the example in which the branch pipes 2 are all set up in the same direction is shown. However, the branch pipes 2 are provided with the pipe headers H3 and H3 shown in FIGS.
Like H4, it may be erected in two different directions from the outer peripheral surfaces of the main pipes 1a and 1b, or like the pipe header H5 shown in FIG. May be erected in different directions, or may be erected in different directions from four locations on the outer peripheral surface of the main pipe 1d, as in the pipe header H6 shown in FIG. When manufacturing these pipe headers H3, H4, H5, H6, the thermoplastic resin pipes 10a, 10b, 10 in which the protrusions 11 are provided at two to four places on the outer peripheral surface are respectively produced.
c and 10d will be used. Further, in the pipe header of the embodiment, an example in which the short pipe is fixed to the thermoplastic resin pipe by screwing is shown, but the short pipe may be fixed to the thermoplastic resin pipe by fusion bonding, It may be fixed to the thermoplastic resin tube by a fixing tool such as a screw.

[0050]

As described above, in the pipe header according to the first aspect of the present invention and the pipe header according to the second aspect of the present invention, the main pipe is composed of one thermoplastic resin pipe. Therefore, turbulent flow can be prevented from occurring in the transport fluid, flow loss of the transport fluid due to friction can be reduced, and it can also be used as a pipe for transporting ultrapure water. Is obtained.
Further, in the pipe header according to claim 2 of the present invention, since the fiber-reinforced thermosetting resin layer is provided on the outer peripheral surface of the main pipe and the outer peripheral surface of the branch pipe, bending rigidity, corrosion resistance, heat resistance, pressure resistance,
The effect of excellent impact resistance is also obtained.

Further, in the manufacturing method according to claim 3 of the present invention, the pipe according to claim 1 of the present invention is achieved while reducing the manufacturing labor and the manufacturing cost, ensuring the pipe accuracy and strength, and making the pipe header compact. The effect that a header can be manufactured is acquired.

Further, in the manufacturing method according to claim 4 of the present invention and the manufacturing method according to claim 5 of the present invention, the manufacturing labor and manufacturing cost are reduced, and the piping accuracy and strength are secured.
Claim 2 of the present invention while making the tube header compact.
The effect is that the described pipe header can be manufactured.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing a pipe header of a first embodiment.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view showing a thermoplastic resin pipe used in the method of manufacturing the pipe header of the first embodiment.

FIG. 4 is a diagram showing a method of manufacturing the pipe header according to the first embodiment.

FIG. 5 is a partial sectional front view showing a pipe header of a second embodiment.

6 is a cross-sectional view taken along the line VI-VI of FIG.

FIG. 7 is a diagram showing a manufacturing method (I) of the pipe header of the second embodiment.

FIG. 8 is a diagram showing a manufacturing method (II) of the pipe header of the second embodiment.

FIG. 9 is a cross-sectional view showing a modified example of the pipe header.

FIG. 10 is a cross-sectional view showing a modified example of the pipe header.

FIG. 11 is a cross-sectional view showing a modified example of the pipe header.

[Explanation of symbols]

 H1, H2 Pipe header 1 Main pipe 10 Thermoplastic resin pipe 11 Projection part 2 Branch pipe 20 Flange short pipe 21 Flange 3 Fiber reinforced thermosetting resin layer

Claims (5)

[Claims] 1. A main pipe, and a plurality of branch pipes which are erected on the outer peripheral surface of the main pipe at intervals in the axial direction of the main pipe.
In the pipe header composed of, the main pipe is formed by a single thermoplastic resin pipe in which a part of the outer peripheral surface is projected except the end portion, and the tip end surface of the protruding portion is formed flat. The pipe header, wherein the branch pipe is composed of a short pipe fixed to a tip end surface of the protrusion. 2. The pipe header according to claim 1, wherein a fiber-reinforced thermosetting resin layer is provided on the outer peripheral surface of the main pipe and the outer peripheral surface of the branch pipe. 3. A thermoplastic resin pipe having a part of an outer peripheral surface protruding and a tip end surface of the protruding part being flat, and a plurality of short pipes are used. A method of manufacturing a pipe header, characterized in that the protruding portion is cut to make the end portion of the thermoplastic resin tube cylindrical, and the plurality of short tubes are fixed to the tip end surface of the remaining protruding portion. 4. A thermoplastic resin tube having a part of the outer peripheral surface protruding and a tip end surface of the protruding portion being flat, and a plurality of short tubes are used. The end of the thermoplastic resin pipe is made into a cylindrical shape by cutting the protruding part, and the fiber-reinforced thermosetting resin layer is provided on the outer peripheral surface of the part excluding the end, and the end face of the protruding part of the thermoplastic resin pipe. The fiber-reinforced thermosetting resin layer provided in the is cut by a size corresponding to the short pipe to provide a plurality of portions where the thermoplastic resin pipe is exposed, and the short pipe is provided in each of the thermoplastic resin exposed portions. Fix it, then
A method of manufacturing a pipe header, wherein a fiber-reinforced thermosetting resin layer is provided on an outer peripheral surface of the flanged short pipe. 5. A thermoplastic resin tube having a part of the outer peripheral surface protruding and a tip end surface of the protruding portion being flat, and a plurality of short tubes are used. The end of the thermoplastic resin pipe is made into a cylindrical shape by cutting the protruding part, and the fiber-reinforced thermosetting resin layer is provided on the outer peripheral surface of the part excluding the end, and the end face of the protruding part of the thermoplastic resin pipe. The fiber-reinforced thermosetting resin layer provided on the is cut by a size corresponding to the short pipe to provide a plurality of portions where the thermoplastic resin pipe is exposed, and fiber-reinforced in advance is provided in each of the thermoplastic resin exposed portions. A method of manufacturing a pipe header, characterized in that a short pipe provided with a thermosetting resin layer on its outer peripheral surface is fixed.