JPH079330B2 - 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, the actual public use number is 47-19970.
As disclosed in the publication, a hydrogen gas discharge device is known in which a hydrogen discharge pipe made of palladium or an alloy thereof is arranged in a container into which hydrogen gas flows and only hydrogen gas is discharged outside the machine. Has become.

(C) Problems to be Solved by the Invention However, this type of hydrogen gas discharge device has the following problems.

In the hydrogen discharge tube of the hydrogen gas discharge device disclosed in Japanese Utility Model Publication No. 47-19970, a blind plug is inserted at one end and sealed with a brazing material, or one end is flatly adhered with pliers or the like and the portion is brazed. It was sealed with wood. For this reason, the size of the portion becomes larger than the diameter of the hydrogen releasing pipe, and the hydrogen releasing pipe cannot be inserted from the portion into the hole of the container. For this reason, a hole larger than the size of the portion is made in the opposite side of the container, a hydrogen releasing pipe is inserted through the hole and then connected to the container, and then the hole is closed to form a hydrogen gas discharging device. Therefore, there is a problem that the number of steps is increased in the manufacturing process.

In addition, as a result of oxidation of the entire surface of the hydrogen release tube due to conduction of heat during brazing, or foreign matter adhering to the surface, about 1/2 to 1/3 of the apparatus when not affected by heat There was also a problem that the hydrogen gas discharge capacity of the hydrogen gas would decrease.

The present invention has been made in view of the above-mentioned problems of the conventional technique, and can reduce the number of steps in the manufacturing process as compared with the conventional device, and can reduce the decrease in the hydrogen gas discharge capacity caused by the manufacturing of the hydrogen discharge pipe. The technical issue is to provide a hydrogen gas discharge device.

(D) Means for Solving Problems As a means for solving the above problems, the present invention uses a palladium metal or its alloy tube as a hydrogen discharge pipe of a hydrogen gas discharge device, and inserts it into the closed container. It has a structure in which one end on the side is sealed by a laser beam, and a sealed portion formed on the other end is arranged in an airtight manner with the sealed container, while the opening portion is exposed to the atmosphere.

(E) Action In the hydrogen gas discharging apparatus of the present invention, since one end of the hydrogen discharge tube is sealed by the laser beam, no mechanical force is applied to this portion, and the size is larger than the diameter of the hydrogen discharge tube. It can be sealed without increasing the size, and can be easily inserted from the portion into the hole for inserting the hydrogen releasing pipe provided in the container.

Further, since the laser beam suitable for heating the local portion of the object in a concentrated manner can melt and seal one end of the hydrogen discharge tube in a short time, the hydrogen discharge tube by conduction of heat applied to the one end. It is possible to prevent the temperature of the whole from increasing, and it is possible to reduce the oxidation of the entire hydrogen-releasing pipe and the adhesion of foreign matter due to the increase in temperature. 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, which is made of iron or copper and is connected to the hydrogen gas introduction pipe (1). (3) is a heater, which has an ambient temperature of the hydrogen gas discharging device of 350 ° C.
It heats to a certain degree. (4) is a hydrogen release tube,
These are made from a palladium tube (6), and (4
(A) is a sealed part formed by laser beam, (4
B) is the opening. Reference numeral (5) is a sealed 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 squeezed by being cold pressed and rotated into a recess or the like (not shown). A laser beam is applied to the narrowed diaphragm portion (6B) for 3 milliseconds to seal the diaphragm portion (6B). At this time, it has been confirmed that it is better to irradiate the laser beam with a slight shift from the focus, so the actual defocus (deviation from the focus) is 2.5 mm. By this sealing, a hydrogen releasing tube (4) having a shape like a test tube is formed as shown in FIG.

We conducted a helium leak test to see if the sealed portion (4A) of the hydrogen release tube (4) was completely sealed. As a result, it was confirmed that the sealed portion (4A) of the hydrogen discharge pipe (4) was completely sealed, so it can be said that the hydrogen discharge pipe (4) was completed.

Next, the connection between 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 hydrogen release pipe (4) is sealed into the hole (2A) at a portion (4A). Insert from. Then, to the opening portion (4B) of the hydrogen discharge pipe (4), the opening portion (4B)
A rod or the like having an outer diameter slightly larger than the inner diameter is inserted to expand the hydrogen release pipe (4). By this pipe expanding work, the hole (2A) and the hydrogen releasing pipe (4) are brought into close contact with each other. As shown in FIG. 6, the sealed portion (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). 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 releasing pipe (4) are melted and sealed (see FIG. 7). We have conducted experiments on laser welding of dissimilar metals and have confirmed that both palladium and iron or palladium and copper are good welds, and the hydrogen-releasing pipe (4) and container ( Welding with 2) with a laser beam also resulted in a good connection 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 ° C. In this heated state,
The hydrogen discharge pipe (4) discharges a larger amount of hydrogen gas than normal 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, since one end of the hydrogen discharge tube is sealed by the laser beam, mechanical force is not applied to this portion, and the size is not larger than the diameter of the hydrogen discharge tube and sealed. It is possible to insert from the above portion into the hole provided in the container. Therefore, the number of manufacturing steps of the hydrogen gas discharge device can be reduced.

Further, since the laser beam suitable for heating the local portion of the object in a concentrated manner can melt and seal one end of the hydrogen discharge tube in a short time, the hydrogen discharge tube by conduction of heat applied to the one end. It is possible to prevent the temperature of the whole from increasing, and it is possible to reduce the oxidation of the entire hydrogen releasing pipe and the adhesion of foreign substances due to the increase in temperature. 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 in which the decrease in hydrogen gas discharge capacity caused by the production of the hydrogen discharge pipe is small.

[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 process, FIG. 4 is an explanatory cross-sectional view showing a state after sealing the opening at the time of drawing, and FIG. 5 is an explanatory cross-sectional view of connection between a hydrogen releasing 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 pipe, (4A) …… Sealed part, (4B) …… Opened part,
(5) …… Sealed part, (6B) …… Squeezed part.

Claims (1)

[Claims] 1. A hydrogen gas discharge device comprising a closed container and a hydrogen releasing pipe for removing hydrogen in the container, wherein the hydrogen releasing pipe is a pipe made of palladium metal or an alloy thereof. , Having a structure in which one end on the side to be inserted into the hermetically sealed container is sealed with a laser beam and a hermetically sealed portion formed at the other end is airtightly arranged with the hermetically sealed container while exposing the opening to the atmosphere. A hydrogen gas discharge device characterized by being formed.