JP2001141132A - Resin bonding tubular body, and its forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin bonding tubular body with ensured roundness, and its forming method. SOLUTION: An annular roundness ensuring member 4 is interposed between one end face of a first tubular member 2 for forming a resin tubular body and one end face of a second tubular body 3 for forming a resin tubular body. The one end faces of the tubular members 2 and 3 are bonded to the roundness ensuring member 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin welded pipe formed by welding two pipes and used for piping of a cleaning solution in a semiconductor manufacturing process and a method for forming the same.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional welding pipe for resin piping. The resin-made welded tube (51) heats one end surface of the resin-made first tubular member (52) and one end surface of the resin-made second tubular member (53), respectively. It is formed by abutting and welding the two (52) and (53). Due to the excellent chemical resistance of fluororesins and the like, the use of resin pipes in the above piping etc. has been increasing. The demand for thinning and thinning is increasing.

[0003]

However, if the diameter of the conventional resin welded pipe is reduced or thinned as it is, the roundness of the welded pipe deteriorates due to flattening of the welded pipe due to insufficient rigidity. There are problems that the sealing performance at the welded portion is deteriorated and that the smooth flow of the fluid is hindered.

An object of the present invention is to provide a resin-made welded pipe having a roundness and a method for forming the same.

[0005]

Means for Solving the Problems and Effects of the Invention A resin welded tube according to the present invention is composed of one end surface of a first tubular member for forming a tube made of resin and the other end of a second tubular member for forming a tube made of resin. An annular resin-made roundness securing member is interposed between the one end face and one end of each tubular member and each end of the roundness securing member are welded.

[0006] The method for forming a welded pipe made of resin according to the present invention is characterized in that a first tubular member for forming a tubular body made of resin and an end face of a second tubular member for forming a tubular body made of resin are provided. An annular resin circularity securing member having cutout portions at both ends where one end of each tubular member is fitted is interposed, and one end of both tubular members is fitted into the cutout of the roundness securing member, Thereafter, one end of each tubular member and each end of the roundness securing member are heated and welded.

As the resin, fluorine-based resins such as PFA and PTFE are preferable because of their excellent chemical resistance. In addition, super-engineering plastics such as polyphenylene sulfide, which are excellent in heat resistance, and other various resins are used. It is possible.

As a heating device for welding, for example, a hot air blowing device is used, but various devices such as a dielectric heating device and a heating device using electromagnetic waves such as far infrared rays can be used. In particular, it is preferable that a heating wire for heating is wound around the roundness securing member, and heating is performed by passing a current through the heating wire. In this way, heating can be performed as long as there is a power source, and a tube can be easily obtained.

According to the resin welding tube of the present invention, the tubular members are welded to each other with the circularity ensuring member interposed therebetween, thereby ensuring the roundness of the welding tube.

According to the method for forming a resin welded tube of the present invention, by fitting the end of the tubular member into the notch of the circularity securing member, the roundness of the tubular member is secured, By the subsequent heating, the welded tube is reliably welded, and a welded tube body with roundness secured is obtained.

Preferably, the notch is formed such that the cross-sectional shape of the roundness securing member is H-shaped or T-shaped.

It is preferable that a heating wire for heating is wound around the roundness securing member, and heating is performed by passing a current through the heating wire. In this way, heating can be performed as long as there is a power source, and a tube can be easily obtained.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a resin welded tube according to the present invention. The welded tube (1) is an end face of a first tubular member (2) for forming a resin tube. An annular resin circularity securing member (4) is interposed between the first tubular member (3) and the one end surface of the second tubular member (3). One end and the roundness securing member (4) are welded to each other.

The first tubular member (2) and the second tubular member (3)
Have the same inner and outer diameters.

The roundness securing member (4) has an inner diameter of a tubular member (2).
The inner diameter of (3) is slightly smaller and the outer diameter is slightly larger than the outer diameters of the tubular members (2) and (3). Roundness securing member
At the center in the radial direction of both end surfaces of (4), a notch (5) into which one end of each tubular member (2) (3) is tightly fitted is formed in a cross-sectional shape of the roundness securing member (4). Are formed to be H-shaped.

FIG. 2 shows a second embodiment of a resin welded tube according to the present invention. The welded tube (11) is an end face of a first tubular member (2) for forming a tube made of resin. An annular resin circularity securing member (14) is interposed between the first tubular member (3) and the one end surface of the second tubular member (3). One end and the roundness securing member (14) are welded to each other.

The roundness securing member (14) has an inner diameter of a tubular member.
(2) Slightly smaller than the inner diameter of (3), the outer diameter is a tubular member (2) (3)
Are formed to have the same outer diameter as. A notch (15) into which one end of each of the tubular members (2) and (3) is tightly fitted is provided on an outer peripheral portion of both end surfaces of the roundness securing member (14), and an annular roundness securing member (14).
Are formed so that the cross-sectional shape becomes T-shaped.

The welded tube of the first and second embodiments
As shown in FIGS. 1 (a) and 2 (a), (1) and (11) are one end faces of the first tubular member (2) for forming a tube and the second tubular member (3) for forming a tube. An annular circularity securing member (4) (14) is interposed between the one end surface of each of the tubular members (2) and (3). After fitting in the notches (5) and (15),
One end of both tubular members (2) (3) and the roundness securing member (4) (1
4) is heated by the heating device (H), and one end of each of the tubular members (2) and (3) is welded to the roundness securing members (4) and (14), respectively.

Since each of the tubular members (2) and (3) is usually rolled and transported and stored, it tends to be flat before being heated. In particular, when the diameter and the thickness are reduced, the influence becomes large. come. As described above, the ends of the tubular members (2) and (3) are flattened by fitting into the cutouts (5) and (15) of the circularity ensuring members (4) and (14). The cross section of one end of the tubular members (2) and (3) returns to a perfect circle, and is welded reliably by the subsequent heating to obtain welded pipes (1) and (11) with roundness secured. .

By the way, as the heating means for obtaining the above-mentioned resin welded tube, known devices such as a hot air blowing device, a dielectric heating device, and a heating device using electromagnetic waves such as far infrared rays can be used. As a simple heating means,
There is one shown in FIG. In FIG. 3, both tubular members (2)
A reinforcing tube (24) is fitted over the butted portion of (3), and a spiral heating wire (25) is built in the reinforcing tube (24). Therefore, when a current flows through the heating wire (25), the butting portion of the reinforcing tube (24) and the two tubular members (2) and (3) is heated and welded. This heating can be performed without a separate heating means (H) as long as there is a power source, and the welding work at the piping site is facilitated. In this case, the heating wire (25) is made of a metal hollow wire, and before welding, the inner pressure is slightly expanded by applying an internal pressure, and the inner pressure is reduced after welding, so that the heating wire (2) is formed.
5) and a reinforcing tube (24) to form a gap between the heating wire (2)
It is also possible to remove the heating wire (25) by pulling the terminal portion (25a) of 5).

FIG. 4 shows a third embodiment of the resin welding tube according to the present invention, in which the heating means shown in FIG. 3 is used.

The welding tube (31) is made of a resin-made first tube.
An annular resin-made circularity securing member between one end surface of the tubular member (2) and one end surface of the second tubular member (3) for forming a tubular body made of resin.
(34) is interposed, and one end of each of the tubular members (2) and (3) is welded to the roundness securing member (34).

The circularity securing member (34) has an inner diameter of a tubular member.
(2) The inner diameter of the tubular member is equal to the inner diameter of (3), the outer diameter is formed larger than the outer diameter of the tubular member (2) (3), the inner peripheral portion, each tubular member
(2) The notch (35) into which one end of (3) is tightly fitted is formed so that the cross-sectional shape of the circularity ensuring member (34) is T-shaped. A spiral heating wire (36) is built in the roundness securing member (34), and by passing a current through the heating wire (36), the roundness securing member (34) and both heating wires (36) are heated. The butted portions of the tubular members (2) and (3) are heated and welded. The heating wire (35) is made of a soft metal hollow wire.Before welding, an internal pressure is applied to the wire to slightly inflate the wire, and after the welding, the internal pressure is reduced to reduce the terminal portion of the heating wire (36). The heating wire (36) can be removed by pulling 36a).

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a resin welded tube according to the present invention and a method for forming the same.

FIG. 2 is a view showing a second embodiment of a resin welding tube according to the present invention and a method for forming the same.

FIG. 3 is a diagram showing a suitable heating means.

FIG. 4 is a view before welding showing a third embodiment of a resin welded tube according to the present invention and a method for forming the same.

FIG. 5 is a view showing a conventional resin welding tube and a method for forming the same.

[Explanation of symbols]

 (1) (11) (31) Resin welded tube (2) First tubular member (3) Second tubular member (4) (14) (34) Roundness securing member (5) (15) (35) ) Notch (36) Heating wire

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B29K 81:00 B29K 81:00 105: 22 105: 22 B29L 23:00 B29L 23:00 (72) Inventor Yuhisa Nitta 4-7-4 Hongo, Bunkyo-ku, Tokyo Inside the Ultra Clean Technology Development Institute (72) Inventor Fumio Ishikawa F-term (reference) 3H019 GA03 3H111 AA02 BA15 CB02 CB14 CB27 CB28 DA02 DA26 DB10 DB22 EA16 4F211 AA16 AA34 AD15 AG08 AG22 AG23 TA01 TA15 TC03 TC07 TC10 TC13 TC20 TD09 TH02 TH06 TJ22 TN02 TN08 TN18 TN30 TQ10 TW06 TW16

Claims (4)

[Claims] An annular resin tube is provided between one end of a first tubular member for forming a tubular body made of resin and one end of a second tubular member for forming a tubular body made of resin. Roundness securing members (4) (14) (34) are interposed, and one end of each tubular member (2) (3) is welded to the roundness securing members (4) (14) (34). Resin welded tube. 2. The resin welding tube according to claim 1, wherein a spiral heating wire (36) is built in the roundness securing member (34). 3. Each of the tubular members (2) is provided between one end surface of a first tubular member (2) for forming a tube made of resin and one end surface of a second tubular member (3) for forming a tube made of resin. ) (3) with an annular resin roundness securing member (4) (14) (34) having notches (5) (15) (35) at both ends where one end is fitted, Both tubular members (2) (3)
One end of the notch of the roundness securing member (4) (14) (34) (5) (1
5) A resin characterized by being heated and welded to a butt portion between one end of each tubular member (2) (3) and a roundness securing member (4) (14). A method for forming a welded pipe body. 4. A spiral heating wire (36) is built in the roundness securing member (34), and heating is performed by passing a current through the heating wire (36). A method for forming a resin welded tube.