JPH079328B2 - Hydrogen gas discharge device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hydrogen gas discharge device used for discharging hydrogen gas generated in a machine such as an absorption refrigerator and an absorption heat pump to the outside of the machine.

(B) Conventional technology In the conventional hydrogen gas discharge device of this type, as disclosed in Japanese Utility Model Publication No. 47-19970, a hydrogen release pipe made of palladium uses a brazing material in a container into which hydrogen gas flows. There is known a hydrogen gas discharge device that is joined together and discharges only hydrogen gas to the outside of the machine.

(C) Problems to be solved by the invention However, in the conventional hydrogen gas discharge device of this kind, the joint portion between the container made of iron or copper and the hydrogen release pipe made of palladium is formed by silver brazing. The silver brazing material was joined, and the silver brazing material also entered the gap of the joining portion and played a role of maintaining the airtightness of the container. Oxidation of the silver brazing material that has entered the gap is further promoted by heating during use, and this oxidation makes the silver brazing material brittle, and due to the dropping and cracking, there is a gap and the airtightness cannot be maintained. That is, there is a problem that the durability of the device is poor.

In addition, as a result of the entire surface of the hydrogen releasing tube being oxidized by the conduction of heat during brazing or foreign matter adhering to the surface, about 1/2 to 1/3 of the time when it is not affected by heat There was also a problem that the hydrogen gas discharge capacity of the device would decrease.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and it is a technical problem to provide a hydrogen gas discharge device that is more durable than the conventional device and has improved hydrogen gas discharge capability. To do.

(D) Means for Solving the Problems As a means for solving the above problems, the present invention forms a hydrogen release pipe attached to a container made of iron or copper from palladium and connects the container and the hydrogen release pipe. The joining portion is melted and joined by a laser beam.

(E) Action In the hydrogen gas discharging apparatus of the present invention, since the joining portion between the container made of iron or copper and the hydrogen releasing tube made of palladium is melted and joined by the laser beam, The joint is less prone to cracking over extended use of the device. Therefore, the device of the present invention maintains the airtightness of the device for a long period of time as compared with the conventional device.

Further, with the laser beam suitable for heating the local area of the object in a concentrated manner, the joint between the hydrogen releasing tube and the container can be melted and joined in a short time, so that the heat applied to the joint can be conducted. It is possible to prevent the temperature of the entire hydrogen-releasing pipe from rising due to the above, and it is possible to reduce the oxidation of the entire hydrogen-releasing pipe and the adhesion of foreign matter due to the temperature rise. Therefore, it is possible to reduce the decrease in the hydrogen gas discharge capacity caused by the oxidation of the hydrogen discharge pipe or the adhesion of foreign matter, and the hydrogen gas discharge apparatus of the present invention sufficiently exhibits the hydrogen gas discharge capacity.

(F) Example Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a hydrogen gas discharge device which is an embodiment of the present invention.
(1) is a hydrogen gas introduction pipe connected to an absorber and a non-condensing gas tank (not shown). (2) is a container into which hydrogen gas flows, and is connected to the hydrogen gas introduction pipe (1). (3) is a heater, which heats the atmosphere temperature of the hydrogen gas discharge device to about 350 ° C. (4) is a hydrogen release tube, which is made from a palladium element tube (6). Reference numeral (5) is a joint portion, which is a portion where the container (2) and the hydrogen releasing pipe (4) are welded by a laser beam.

The configuration of the present invention is as described above, and the manufacturing process will be described below. First, the production of the hydrogen discharge tube (4) will be described with reference to FIGS. 2, 3, and 4. FIG. 2 shows a palladium shell (6). Third
The figure shows a state in which one opening (6A) of the palladium shell (6) is pressed against a round recess (not shown) to squeeze. The opening (6B) is irradiated with a laser beam to slightly squeeze the surrounding area to seal the opening (6B). Therefore, as shown in FIG. 4, the hydrogen discharge tube (4) is shaped like a test tube.

Next, joining of the container (2) and the hydrogen releasing pipe (4) will be described with reference to FIGS. 5, 6, and 7. The hole (2A) provided in the container (2) has an inner diameter slightly larger than the outer diameter of the hydrogen release pipe (4), and the hole (2A) seals the hydrogen release pipe (4) at the portion (4A). Insert from. Then, a rod or the like having an outer diameter slightly larger than the inner diameter of the opening is inserted into the opening of the hydrogen releasing tube (4) to expand the hydrogen releasing tube (4). By this pipe expanding work, the hole (2A) and the hydrogen releasing pipe (4) are brought into close contact with each other. The joint (5) between the container (2) and the hydrogen release tube (4) emits a laser beam at an angle of 45 ° to the surface of the container (2) and releases hydrogen from the container (2) as shown in FIG. Irradiate while simultaneously rotating the tube (4). This time is only 3 seconds. As a result, the container (2) and a part of the hydrogen discharge pipe (4) are melted and joined. We conducted an experiment of welding different metals with a laser beam and found that both palladium and iron or palladium and copper were good welds, and the hydrogen release pipe (4) and the container ( Welding with 2) with a laser beam also resulted in good joining as in the above results.

Next, the time of use will be described. In order to discharge the hydrogen gas in the absorber or the non-condensable gas tank to the outside of the hydrogen gas discharging device, the ambient temperature of the device is initially set to 35 by the heater (3).
Heat to about 0 °. In this heated state, the hydrogen discharge pipe (4) discharges a larger amount of hydrogen gas than the room temperature to the outside of the device.

(G) Effects of the Invention The present invention is as described above, and has the following unique effects.

In the hydrogen gas discharging apparatus of the present invention, the joining portion between the container made of iron or copper and the hydrogen releasing tube made of palladium is melted and joined by a laser beam, so that the joining portion is long-term. Is less likely to crack even when used. Therefore, the device of the present invention maintains the airtightness of the device for a long period of time as compared with the conventional device. Therefore, it becomes possible to provide a hydrogen gas discharge device having durability superior to that of the conventional device.

In addition, since the laser beam suitable for intensively heating the local area of the object can melt and bond the joint between the hydrogen releasing tube and the container in a short time, conduction of heat applied to the joint can be performed. It is possible to prevent the temperature of the entire hydrogen release tube from rising due to
It is possible to reduce oxidation of the entire hydrogen release pipe and adhesion of foreign matter due to the temperature increase. Therefore, it is possible to reduce the decrease in the hydrogen gas discharge capacity caused by the oxidation of the hydrogen discharge pipe or the adhesion of foreign matter, and the hydrogen gas discharge apparatus of the present invention sufficiently exhibits the hydrogen gas discharge capacity. Therefore, it is possible to provide a hydrogen gas discharge device having an improved hydrogen gas discharge capacity as compared with the conventional device.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a hydrogen gas discharge device which is an embodiment of the present invention, and FIG. 2 is an explanatory cross-sectional view for manufacturing a hydrogen discharge pipe,
FIG. 3 is an explanatory cross-sectional view after completion of the drawing step, FIG. 4 is an explanatory cross-sectional view showing a state after sealing an opening at the time of drawing, and FIG. 5 is an explanatory cross-sectional view of joining of a hydrogen release pipe and a container, FIG. 6 is an explanatory sectional view of laser welding, and FIG. 7 is an explanatory sectional view after welding. (2) ... Container, (3) ... Heater, (4) ... Hydrogen release tube, (5) ... Joint part, (6B) ... Open.

Claims (1)

[Claims] 1. A hydrogen gas discharging apparatus comprising a container and a hydrogen releasing pipe arranged in the container, wherein the container is made of iron or copper, and the hydrogen releasing pipe is made of palladium. The hydrogen gas discharging device is characterized in that the joint portion between the container and the hydrogen releasing pipe is melted and joined by a laser beam.