Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1998-08-10
2000-04-25
Wilson, Pamela A.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34140, 34141, 432108, F26B 1104
Patent
active
060529172
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a vacuum rotary dryer suitable for use for drying particulate solids.
BACKGROUND ART
A vacuum rotary dryer generally includes a rotary drum including a jacket of a double peripheral wall structure in which hot water is flowed to heat it and a pressure reducing unit for reducing a pressure in the rotary drum and is adapted to dry a material to be treated or dried (or treated or dried material) which is received in the rotary drum while reducing a pressure in the rotary drum.
Such a vacuum rotary dryer exhibits advantages such as saving of energy required for drying of a treated material, a reduction in drying time, minimizing of a water content of a product, complete removal of an organic material and a solvent from a treated material, elimination of oxidation of a treated material and firing thereof due to oxygen in air, low-temperature drying of a treated material, and the like, because it is constructed to dry a material while reducing a pressure in the rotary drum.
Thus, such a dryer is extensively applied to manufacturing of pharmaceuticals in which it is highly required to prevent a deterioration in quality of pharmaceuticals due to oxidation and contamination thereof due to inclusion of any impurity therein or adhesion of bacteria thereto or the like.
In manufacturing of pharmaceuticals, it is required to minimize or substantially prevent contact of a product with the hands or an ambient atmosphere during a manufacturing process. Unfortunately, the conventional vacuum rotary dryer described above needs manual operation in charging of a treated material or treated solids into the rotary drum and removal of the solids dried from the rotary drum, resulting in failing to prevent contact of the solids with the hands and an ambient atmosphere.
Also, the conventional vacuum rotary dryer fails in automation of a drying step because it requires manual operation in charging of a treated material or treated solids into the rotary drum and removal of the solids dried from the rotary drum. Thus, the drying step is deterrent to automation of manufacturing facilities.
An object of the present invention is to provide a vacuum rotary dryer which is capable of permitting all steps extending from charging of solids to a rotary drum to removal of the solids therefrom to be carried out without any manual operation.
DISCLOSURE OF INVENTION
In accordance with the present invention, a vacuum rotary dryer for drying particulate solids is provided. The vacuum rotary dryer includes a rotary drum arranged so as to be varied in inclination angle at which a central axis thereof acting as a center of rotation thereof is inclined with respect to a horizontal direction in a vertical plane, a drum inclination angle adjusting structure for adjusting the inclination angle of the central axis of the rotary drum, a drum rotating driver for driving the rotary drum to rotate it, a gas flow pipe arranged so as to airtightly extend through a central portion of one end of the rotary drum in an axial direction thereof into the rotary drum while permitting rotation of the rotary drum, a pressure reducing unit for sucking gas in the rotary drum to reduce a pressure in the rotary drum, a gas flow passage change-over structure for connecting the gas flow pipe to a piping connected to the pressure reducing unit and a gas space at an atmospheric pressure while carrying out change-over thereof, a solids feed and discharge pipe including a straight pipe section having one end inserted into the rotary drum from a side of the other end of the rotary drum in the axial direction thereof while permitting rotation of the rotary drum and a swing section arranged so as to extend from the one end of the straight pipe section positioned in the rotary drum toward a peripheral wall of the rotary drum and communicate with the straight pipe section, a feed and discharge pipe drive structure arranged so as to rotate the straight pipe section of the solids feed and discharge pipe to pivotally move the swing section in
REFERENCES:
patent: 4071229 (1978-01-01), Domazer et al.
patent: 4864942 (1989-09-01), Fochtman et al.
patent: 5517004 (1996-05-01), Blonk
Matsumoto Machine Mfg. Co., Ltd.
Wilson Pamela A.
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