JPS5921885Y2 - solid gas separator - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a solid-gas separator for sampling each powder production loft in, for example, powder metallurgy in which powder is filled into a mold, molded, and then sintered.

Conventionally, in the so-called powder metallurgy technology in which powder is filled into a mold, molded, and then sintered, it is extremely important for quality control to understand the powder characteristics, which vary from powder production lot to lot.

To this end, we sampled a small amount for each powder production lot, investigated the powder characteristics, and created a prototype in advance.
In addition to confirming the characteristics of molded products, so-called advance tests are customarily and widely carried out to feed back the properties of prototypes to the manufacturing conditions for mass production.

Sampling with a spoon is commonly used to collect sample powder to examine the powder characteristics mentioned above, but as the manufacturing loft becomes larger and the amount of sample powder increases accordingly, the sampling work and the time required for it also increase. It will increase significantly.

In particular, uranium dioxide powder, which is a fissile material, and food-related powder cannot be directly touched.

In addition, powders with a powder diameter of several microns and a heavy specific gravity, such as U
Because O2 powder is a fine particle, it has a large angle of repose (the angle that the ridgeline of the powder deposited on a horizontal plane makes with the horizontal plane) and has the property of easily adhering to objects and forming bridges. Even if an attempt is made to collect a sample using an ordinary cyclone separator as shown in FIG. 1, the powder often accumulates in the hopper 1 and does not enter the sampling bottle 2.

Thus, if even a small amount of powder remains inside the device, it is inappropriate as a sample collection device.

This idea was made based on the above-mentioned circumstances, and is a solid-gas separation system that allows solids in gas to be separated and collected from gas with high efficiency and reliably when performing solid-gas separation (for example, powder sampling). It provides equipment.

Hereinafter, this invention will be explained in detail with respect to powder sampling shown in FIG.

In the figure, reference numeral 1 indicates a hopper 1 having a cyclone effect.
A sample powder collection bottle 2 is removably attached below the hopper 1.

An intake pipe 3 whose suction port extends to the expanded portion 2a of the bottle 2 is inserted from above the hopper 1, and the other end of the intake pipe 3 is connected to a pressure reducing device (not shown).

Further, from the side of the hopper 1, a supply pipe 4 in a part where powder is not introduced, through which powder is introduced together with gas from a powder mixer (not shown) or the like, is opened so as to be introduced in the tangential direction of the hopper 1. There is.

In the solid-gas separator configured as described above, the pressure inside the hopper 1 and the sampling bottle 2 are first reduced by the pressure reducing device, and a predetermined sampling powder is fed from the powder mixer into the hopper 1 via the supply pipe 4. will be introduced in

At this time, the sampling powder is rotated in the hopper 1 and moved below the sampling bottle 2, and the flow rate gradually weakens, the powder accumulates at the bottom of the bottle 2, and clean gas is exhausted to the outside from the intake pipe 3. be done.

Therefore, the powder collected in the collection bottle 2 can be removed from the connection between the hopper 1 and the collection bottle 2, covered, and carried as is, or transferred to another location.

In addition, the powder separation device according to this invention has an average particle size of about lμ
From the experimental results for the UO2 powder, it was found that the most preferable cyclone effect was obtained when the powder was molded at the ratio shown in FIG.

That is, the height Hl of the hopper 1 is 100
Then, the inverted conical part 1b is 150 to 200 mm, the diameter d1 of the cylindrical part 1a is 150, and the inverted conical part 1b is 150 to 200 mm.
The minimum diameter d2 of is 120.

Further, the diameter d3 of the suction pipe 3 and the supply pipe 4 of the powder introduction section inserted into the hopper 1 is 50 mm.

The length l of the suction port of the suction pipe 3 is configured such that 300 to 350 mm is inserted from the upper surface of the hopper 1, assuming that the cylindrical portion 1a is 100 mm.

At this time, it is preferable to reduce the pressure to 30 to 40 cmHg using a pressure reducing device.

On the other hand, the most suitable height H2 of the collection bottle 2 was 300 mm and the diameter d4 was 250 mm.

In the above embodiment, a case was described in which a pressure reducing device was connected to the intake pipe 3 for sampling.
Alternatively, pressurized gas may be introduced into the hopper 1.

As detailed above, this invention is effective for sampling difficult-to-flow or adhesive powders that do not like powder adhesion or accumulation on a part of the hopper, is easy to handle, and reduces work time. It can be significantly shortened.

Furthermore, since no powder remains in the device, sampling accuracy is improved even when changing to a different manufacturing lot.

Furthermore, it has practical effects such as being able to collect samples from powders that require careful handling, such as food-related and nuclear fuel materials, without directly touching them.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional embodiment, FIG. 2 is an explanatory diagram showing a powder separation apparatus according to this invention, and FIG. 3 is an explanatory diagram showing a typical shape of an embodiment according to this invention. 1... Hopper, 2... Collection bottle, 2a
...Expansion part, 3...Intake pipe, 4...
...Supply pipe.

Claims (1)

[Scope of utility model registration request] In an apparatus for separating powder and gas, a hopper having a cyclone effect is removably fitted into a collection bottle, and the hopper is provided with an exhaust pipe extending from the top of the hopper to an expanded part of the collection bottle, and a tangent line inside the hopper is provided. A solid-gas separator characterized in that a supply pipe for introducing powder dispersed in the direction is opened, and the powder is introduced into the hopper under reduced pressure or under pressure.