JPH0397603A - Method for fixing pipe for gaseous hydrogen purifier to holder - Google Patents

Abstract

PURPOSE:To eliminate gas leakage at the weld zone by inserting the open end of a Pd alloy pipe with an SUS collar mounted on its open end into the thin-walled part of an SUS short pipe, welding the pieces and then welding the thick-walled part of the short pipe to the mounting hole of the holder. CONSTITUTION:The open end of the Pd alloy pipe 1 with one end sealed is inserted into a short pipe 4 of SUS 316. The collar 5 of SUS 316 is then mounted on the open end of the pipe 1 to sandwich the open end of the pipe 1. The collar 5, open end of the pipe 1 and pipe 4 are welded by electron-beam welding 6. Subsequently, one side of the pipe 4 is inserted into the mounting hole 3 bored staggeringly at the center of the SUS discoid holder 2. The periphery of the open end at its one end is welded to the open edge of the hole 3 by TIG welding 7. Consequently, the Pd alloy pipe is welded to the holder without bending or cracking the pipe and causing gas leakage at the weld zone.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for attaching a pipe for a hydrogen gas production device to a holder.

(Conventional technology) A hydrogen gas purification device is a hydrogen gas purification system in which hydrogen molecules in contact with the surface of the palladium alloy pipe are converted into hydrogen gas by flowing pressurized low-purity raw material hydrogen gas outside a palladium alloy pipe that is sealed at one end. The hydrogen atoms penetrate into the palladium as atoms, and since the pressure inside the palladium alloy pipe is lower than the pressure on the outside, the hydrogen atoms pass through the wall of the palladium alloy pipe and reach the inner surface, where they become hydrogen molecules again. Only hydrogen gas can be taken out into the palladium alloy pipe, resulting in highly pure hydrogen gas.

In this hydrogen gas purification apparatus, in order to attach a palladium alloy pipe with one end sealed to a holder, conventionally, as shown in FIG. The opening edges of the pipes 1 and 3 were fitted and pressed into the numerous pipe mounting holes 3 of the pipe 1, respectively, and the peripheral edges of the opening ends of the pipes 1 were brazed to the opening edges of the pipe mounting holes 3 using AuNi solder in H 2 gas.

(Problems to be Solved by the Invention) The above-mentioned palladium alloy pipe 1 has a wall thickness that is thinner than its outer diameter in order to save materials (Z) and improve gas purification permeation efficiency. Therefore, during the above-mentioned brazing, heat effects and H! The palladium alloy pipe 1 was bent or cracked due to volumetric expansion due to absorption of . Furthermore, the solder flow could not be controlled uniformly, resulting in incomplete joining and gas leakage.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a method for attaching a Paraji Kumu alloy pipe for a hydrogen gas purification device to a holder without bending or breaking it and without causing gas leakage at the joint. .

(Means for Solving the Problems) A method of attaching a pipe for a hydrogen gas purification device to a holder according to the present invention in order to solve the second problem is to attach the inner periphery of the open end of a palladium alloy pipe whose one end is sealed. , fit the other side of a short pipe with openings on both sides made of SUS with thick wall on one side and thin wall on the other side, and then fit a collar made of SUS on the outer peripheral surface of the open end of the palladium alloy pipe. Next, these are joined to the open end of the palladium alloy pipe by welding, and then one side of the short pipe is inserted into the pipe mounting hole of the holder, and the periphery of one end of the short pipe is attached to the opening edge of the pipe mounting hole. It is characterized by being welded to.

(Function) As described above, the method of attaching the pipe for hydrogen gas purification equipment to the holder of the present invention does not involve brazing the palladium alloy pipe directly to the holder, but instead uses a short piece of SUS joined to the open end of the palladium alloy pipe. Since the thick-walled edge of one end of the pipe is welded to the opening edge of the pipe installation hole in the holder, the palladium alloy pipe will not bend or crack due to heat effects, and it is possible to install short pipes one by one by welding. Since it is bonded to the opening edge of the hole, the welding process is high and gas leakage may occur.

In addition, when joining a short pipe to a thin-walled palladium alloy pipe, the open end is sandwiched between a collar and welded while protecting the open end, so heat is only applied locally and the thin-walled pipe is welded. There is no thermal deformation of palladium alloy pipes.

(Example) An example of the method of attaching a pipe for a hydrogen gas purification apparatus to a holder according to the present invention will be described with reference to the drawings.

As shown in FIG. 1a, a Q as shown in FIG. One side of the mouth has a wall thickness of 0.75 mm over a length of 7 mm,
The other side of the short pipe 4, which is made of SUS 316 with a wall thickness of 0.2 mm, a wall thickness of 0.2 mm, and an inner diameter of 2.5+na+, is fitted over the other side with a length of 10 mm.

Next, on the outer circumferential surface of the open 1'' end of the pipe L, as shown in Fig.
One collar 5 from US 316 is fitted to sandwich the open end of the pipe 1. Then color 5
, the open end of the Pd-Ag 23% pipe], and the short pipe 4 are electron beam welded 6 as shown in Fig. 1d.
Join at. After that, as shown in Fig. 1e, the thickness was 5 mm,
An example part of the short pipe 4 is fitted into each of the 4 mm inner diameter pipe mounting holes 3 that are bored in the center of a disk-shaped holder 2 made of SUS with an outer diameter of 40 mm in a zigzag pattern at a pitch of 6 mm. , the periphery of the open end on one side of the pipe mounting hole 3
It was joined to the edge of the opening by TIG welding 7.

On the other hand, to explain the conventional example, as shown in Fig. 2, 10 inner diameter holes are bored in the center of a disc-shaped holder 2 made of SUS with a thickness of 5 mm and an outer diameter of 40 mm, in a 1,900-square arrangement at a pitch of 6 mm. 3mm pipe mounting hole 3, each length 4
00mm, outer diameter 3mm, wall thickness 0.05mm Pd-Ag
23% of the pipe 1 with one end sealed, push the open end of the pipe 1 into place, and press the open end of the pipe 1 into the open end of the pipe attachment hole 3.
Brazed with uNi wax.

When quality was inspected for each 100 pipes l for the hydrogen gas purification apparatus in the embodiment and the conventional example that were attached to the holder 2, it was found that the hydrogen gas in the conventional example? There were two pipes 1 for the equipment manufactured by +1 that had bent or cracked pipes and gas leakage at the joint with the holder 2, whereas the pipe 1 for the hydrogen gas purification equipment in the example There was nothing like that in .

(Effects of the Invention) As can be seen from the above explanation, according to the method of attaching a pipe for a hydrogen gas purification device to a holder according to the present invention, the pipe for a hydrogen gas purification device can be heated without causing +Ih cracks or cracks.
Moreover, it can be attached to the holder without causing gas leakage at the joint.

Furthermore, since the pipe for the hydrogen gas purification device does not need to be annealed (up to 1050° C.) unlike conventional brazing using AuNi brazing, it can maintain its mechanical strength.

[Brief explanation of drawings]

Figures 1a to 1e are diagrams showing the steps of the method for attaching a pipe for a hydrogen gas purification apparatus to a holder according to the present invention, and Figure 2 is a diagram showing a conventional method for attaching a pipe for a hydrogen gas purification apparatus to a holder. be.

Claims (1)

[Claims] 1) Fit the other side of a short pipe with an open end made of SUS, thick on one side and thin on the other side, to the inner peripheral surface of the open end of a palladium alloy pipe with one end sealed, and then A collar made of SUS is fitted onto the outer circumferential surface of the open end of the palladium alloy pipe, and then these are joined to the open end of the palladium alloy pipe by welding.After that, one side of the short pipe is attached to the holder. A method for attaching a pipe for a hydrogen gas purification device to a holder, the method comprising inserting the short pipe into a hole and welding the peripheral edge of one end of the short pipe to the opening edge of the pipe attachment hole.