JP3164777B2 - Powder suction nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder suction nozzle for sucking powder stored in a container, and more particularly, to a powder suction nozzle radially extending from an inner wall of a bottomed cylindrical container body toward the center. The present invention relates to a powder suction nozzle mainly for sucking radioactive substance powder, which is housed in a powder container having fins formed thereon.

[0002]

2. Description of the Related Art In general, when storing a powder that generates internal heat due to self-decay heat even during storage, such as a radioactive substance powder, for example, a plutonium oxide powder or a mixed powder of uranium oxide and plutonium oxide, A storage container using a material such as aluminum having good heat conductivity is used. In addition, it is necessary to prevent the exposure of workers to the handling of radioactive material, especially when handling or filling the container with radioactive material powder, and safety and strict quality control of radioactive material powder Is emphasized.

As a means for transferring the radioactive substance powder stored in the storage container to the outside of the container, a method of inserting a single tubular nozzle into the storage container and suctioning by a negative pressure source is used.

[0004]

Conventionally, as the storage container, there is known a storage container in which radial fins are formed from the inner side wall of the bottomed cylindrical container body toward the center (actual opening). The decay heat of the radioactive substance powder is radiated outside the container through the fins.

[0005] Therefore, the space in which the nozzle can be inserted in the storage container is only the central portion which does not interfere with each fin, and the diameter of the nozzle is limited to a predetermined size or less.

Further, since the plutonium oxide powder or the mixed powder of uranium oxide and plutonium oxide has poor fluidity, the nozzle is caused to enter the storage container, and the powder is sequentially sucked from above. Even if it is, the state of the original lump is hard to collapse. Therefore, when the nozzle was inserted into the center of the storage container (nozzle insertion space), only the powder at the center was taken out, and the powder sometimes remained between the fins.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a storage container provided with fins therein.
It is an object of the present invention to provide a powder suction nozzle having a sufficient suction effect without leaving powder in a container even if the powder has poor fluidity.

[0008]

The present invention has the following features to attain the object mentioned above. That is, in the powder suction nozzle according to claim 1, a plurality of radial fins are formed from the inner side wall of the bottomed cylindrical container body toward the center, and the inner bottom wall and the inner side wall of the container body are formed. The gap is formed on an inclined surface that gradually descends toward the center, and is inserted into a powder container provided with a gap between the inner bottom wall and the fin to suck the powder stored in the powder container. A nozzle body formed to have a smaller diameter than a circle inscribed at the tips of the plurality of fins formed at the center of the container body so as not to interfere with the fins during insertion, and a tip of the nozzle body. And a plurality of suction portions provided to protrude radially outward from the nozzle body to positions respectively facing between the fins, and these suction portions move the nozzle body around an axis. Rotation When allowed, the technology that is smaller than the gap between the fins and can rotate without interfering with such as the inner bottom wall and said fins are employed.

In this powder suction nozzle, the nozzle body is
When inserted into a powder container, the diameter is smaller than a circle inscribed in the tips of the plurality of fins formed at the center of the container body so as not to interfere with the fins, and formed at the tip of the nozzle body. Since the suction portion is provided so as to protrude radially outward from the nozzle body to a position facing each of the fins, when this powder suction nozzle is gradually inserted into the powder container, the powder container It is possible to suck not only the powder at the center of the fin but also the powder between the fins. Further, the suction portion is formed smaller than the gap between the inner bottom wall and the fin, and is rotatable without interfering with the fin when the nozzle body is rotated around an axis. Therefore, the powder collected on the inner bottom wall by the inclined surface can be sucked over the entire inner bottom wall. In addition, due to the rotation of the suction part, a cavity is formed at the bottom of the container, so that the powder remaining between the fins slides down by its own weight, is collected on the inner bottom wall along the inclined surface, and is sucked by the suction part. You.

According to a second aspect of the present invention, in the powder suction nozzle according to the first aspect, the suction unit includes:
A technique is employed in which the container body is provided so as to protrude radially outward to the position of the inclined surface of the container body, and is provided with a scraping plate portion for scraping off the powder on the inclined surface when rotating.

In this powder suction nozzle, the suction portion includes:
A scraping plate portion protruded radially outward to the position of the inclined surface of the container body is provided, and by rotating it,
Since the powder adhering to the inclined surface can be scraped off, the powder has poor fluidity, and even if the powder does not flow down from the inclined surface to the inner bottom wall by its own weight, suction is surely performed. It is possible to

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a powder suction nozzle according to the present invention will be described below with reference to FIGS.

In these figures, reference numeral 10 denotes a powder suction nozzle. The powder suction nozzle 10 includes a hollow pipe-shaped nozzle body 20 and a plurality of fold-shaped suction portions 30 integrally formed at the tip of the nozzle body 20.

The powder suction nozzle 10 is for sucking the mixed powder of uranium oxide and plutonium oxide stored in the powder container 60. The powder suction nozzle 10 has a flange portion 21 formed at a base end portion of the nozzle body 20.
The powder is transferred to the outside of the container by being connected to a sliding double-pipe flange portion of a negative pressure source (not shown).

First, a description will be given of a powder container 60 in which the powder suction nozzle 10 is used.

The powder container 60 is made of an aluminum alloy. The upper part of a cylindrical container body 61 having a bottom is reduced in diameter in a funnel shape to form a shoulder portion 62, and is further formed in a narrow shape to form a neck portion 63. It has been. Inside the container body 61, a shoulder 6
Two types of long and short radial fins 65 and 66 are formed alternately from the inner wall 64 to the center. A tapered portion 67 is formed at the upper central side of these fins 65 and 66. The powder container 60 contains two types of long and short fins 6 when a powdery heating substance such as a mixed powder of uranium oxide and plutonium oxide is stored therein.
5, 66 ensures that heat can be removed to the outside of the container.

Further, between the inner bottom wall 68 and the inner side wall 64 of the container main body 61, there is formed an inclined surface 69 which gradually descends toward the center. The inclined surface 69 has a function of collecting the powder at the center of the inner bottom wall 68 and facilitating the suction, and also has a function near the outer peripheral portion of the inner bottom wall 68 that is difficult to suck the powder and thus easily remains. There is a function that does not create a dead space. Further, the inclined surface 69 has a function of reducing the volume of the lower portion of the container main body 61 and increasing the contact area to easily absorb the decay heat of the powder.

The fins 65 and 66 have their lower portions cut out above the inclined surface 69, and a predetermined space S1 is provided between the fins 65 and 66 and the inner bottom wall 68. Have been.

Next, the powder suction nozzle 10 will be described in relation to the powder container 60.

As shown in FIG. 2, the nozzle body 20
Is formed to have a smaller diameter than the circle C formed at the center of the container main body 61 and inscribed at the tips of the three longer fins 65. When the powder suction nozzle 10 is inserted into the powder container 60, The fins 65 and 66 do not interfere with each other.

Six suction portions 30 are provided between the respective fins 65 and 66 in the circumferential direction of the container body 61 in the same manner as the number of S2. As shown in FIG.
Is provided so as to gradually project radially outward from the nozzle body 20 from a base end (upper part) to a distal end part (lower part) in a side view. As shown in FIG. 2, the flat cross-sectional shape at the distal end of each suction portion 30 is elongated and projects radially outward to a position facing S2 between the fins 65 and 66.

As shown in FIG. 3, a pair of side plate portions 31 substantially parallel to the axis of the nozzle body 20 are provided on the side of each suction portion 30.
The side plate portion 31 projects radially outward to the position of the inclined surface 69. When the powder suction nozzle 10 or the powder container 60 is rotated around the axis, the side plate portions 31 function as a scraper, like a scraper, for scraping off the powder attached on the inclined surface 69. I do.

The opening surface at the distal end of each suction portion 30 includes a first surface 32 substantially parallel to the inner bottom wall 68 and a second surface 33 substantially parallel to the inclined surface 69. The inner bottom wall 68 and the inclined surface 69 are shaped so as to easily suck the powder on each surface.

In the powder suction nozzle 10 of the present embodiment, the nozzle body 20 is provided at the tips of a plurality of fins 65 formed at the center of the container body 61 so as not to interfere with the fins 65 and 66 when inserted into the powder container 60. The suction portion 30, which is formed to have a smaller diameter than the contacting circle C and is formed at the tip of the nozzle body 20, extends radially outward from the nozzle body 20 to a position facing the space S2 between the fins 65, 66. When the powder suction nozzle 10 is gradually inserted into the powder container 60, not only the powder at the center of the powder container 60 but also the fins 6 are provided.
It is also possible to suck the powder of S2 between 5,66.

Further, the suction portion 30 is formed smaller than the gap S1 between the inner bottom wall 68 and the fins 65 and 66, and when the nozzle body 20 is rotated around the axis, Since it is rotatable without interfering with the fins 65 and 66, the powder collected on the inner bottom wall 68 by the inclined surface 69 can be sucked over the entire circumference of the inner bottom wall 68.

In the powder suction nozzle 10, the suction portion 30 is provided with a scraping plate portion 31 projecting radially outward to the position of the inclined surface 69 of the container body 61. By rotating the powder container 60, the powder adhering on the inclined surface 69 can be scraped off, so that the powder has poor fluidity. Even if it does not flow down to 68, it is possible to reliably suck.

In the above embodiment, the shape of each suction portion 30 in a side view is changed from the base end (upper) to the front end (lower).
However, the present invention is not limited to this shape, and the shape in a side view may be, for example, a simple rectangular shape.

[0028]

According to the powder suction nozzle of the present invention, when the nozzle body is inserted into the powder container, the nozzle body is provided at the tip of the plurality of fins formed at the center of the container body so as not to interfere with the fin. The suction portion formed at a smaller diameter than the contacting circle, and formed at the tip of the nozzle body, is provided so as to protrude radially outward from the nozzle body to a position facing each space between the fins. Therefore, when this powder suction nozzle is gradually inserted into the powder container, it is possible to suction not only the powder at the center of the powder container but also the powder between the fins. Further, the suction portion is formed smaller than the gap between the inner bottom wall and the fin, and does not interfere with the fin when the nozzle body or the powder container is rotated around an axis. Since it is rotatable, the powder collected on the inner bottom wall by the inclined surface can be sucked over the entire inner bottom wall. From the above, the effect is obtained that the powder container is provided with the fins therein and the powder does not remain in the container even if the powder has poor fluidity.

According to the powder suction nozzle of the second aspect,
The suction portion is provided with a scraping plate portion projecting radially outward to the position of the inclined surface of the container body, and attached to the inclined surface by rotating a powder suction nozzle or a powder container. Since the powder can be scraped off, the powder has poor fluidity, and even if it does not flow down from the inclined surface to the inner bottom wall only by its own weight, it is possible to reliably suck the powder.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one embodiment of a powder suction nozzle according to the present invention and an example of a powder container to which the nozzle is applied.

FIG. 2 is a plan sectional view showing an embodiment of a powder suction nozzle according to the present invention and an example of a powder container to which the nozzle is applied.

FIG. 3 is an enlarged side sectional view showing an embodiment of a powder suction nozzle according to the present invention and an essential part of an example of a powder container to which the nozzle is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Powder suction nozzle 20 Nozzle main body 30 Suction part 31 Scratch plate part 60 Powder container 61 Container main body 64 Inner side wall 65 Fin 66 Fin 68 Inner bottom wall 69 Inclined surface C It inscribes the front-end | tip of several fins formed in the center of a container main body. Circle S1 Distance between inner bottom wall and fin S2 Between fins

Continuing from the front page (72) Inventor Taiichiro Ninomiya 1-3-25 Koishikawa, Bunkyo-ku, Tokyo Daishi Koishikawa Building Mitsubishi Materials Corporation Reprocessing Facility Construction Center (56) References JP-A-3-96895 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G21C 21/02 G21F 5/008

Claims (2)

(57) [Claims] A plurality of radial fins are formed from an inner wall of a bottomed cylindrical container body toward the center, and a space between the inner bottom wall and the inner wall of the container body is gradually increased toward the center. A powder suction nozzle formed on a descending inclined surface and inserted into a powder container provided with a gap between the inner bottom wall and the fin to suck powder stored in the powder container, A nozzle body formed at the center of the container body so as not to interfere with the fin at the time of insertion and having a diameter smaller than a circle inscribed at the tips of the plurality of fins; and the fin formed at the tip of the nozzle body. A plurality of suction portions provided to protrude radially outward from the nozzle body to positions facing each other, and these suction portions, when the nozzle body is rotated about an axis, Interference with the fin A powder suction nozzle characterized in that it is formed smaller than the gap between the inner bottom wall and the fin so as to be rotatable without being rotated. 2. The powder suction nozzle according to claim 1, wherein the suction portion is provided so as to protrude radially outward to a position of an inclined surface of the container main body, and at the time of rotation thereof, is provided on the inclined surface. A powder suction nozzle having a scraper portion for scraping powder.