US3821857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous drying of solid particles
Assignee: Fives Lille Cail
•
Filing: 1973-05-01
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Granted: 1974-07-02
•
Expires: 1993-05-01
Abstract
Abstract A liquid-solid mixture is dried in a rotary basket, the separated liquid phase is received in an annular housing surrounding the basket and the centrifugally ejected solid particles are dried in a fluid-tight, closed casing defining a drying chamber surrounding the housing and filled with a dense and inert fluid, such as compressed air, to increase the drag on the projected particles and to brake them along the entire length of their trajectory.
Inventors
- 👤 A Mercier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:25
CPC Classifications
B; B04; B04B; B04B7/00; B04B7/02; B04B7/04; B04B11/00; B04B11/02
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
74 words
Process of continuously drying solid particles, comprising the steps of 1. projecting particles out of a rotary drying basket into a fluid-tight, closed chamber filled with a gaseous fluid, and 2. maintaining the pressure in the chamber at such a value that the density of the gaseous fluid filling the chamber is higher than that of air at atmospheric pressure to increase the drag on the projected particles along their trajectory in the chamber.
Claim 2
Dependent Claim
74 words
Process of continuously drying solid particles, comprising the steps of 1. projecting particles out of a rotary drying basket into a fluid-tight, closed chamber filled with a gaseous fluid, and 2. maintaining the pressure in the chamber at such a value that the density of the gaseous fluid filling the chamber is higher than that of air at atmospheric pressure to increase the drag on the projected particles along their trajectory in the chamber.
Claim 3
Dependent Claim
14 words
first conduit means for supplying a liquid-solid mixture to be dried to the basket,
Claim 4
Dependent Claim
14 words
first conduit means for supplying a liquid-solid mixture to be dried to the basket,
Claim 5
Dependent Claim
43 words
maintaining the pressure in the chamber at such a value that the density of the gaseous fluid filling the chamber is higher than that of air at atmospheric pressure to increase the drag on the projected particles along their trajectory in the chamber.
Claim 6
Dependent Claim
43 words
maintaining the pressure in the chamber at such a value that the density of the gaseous fluid filling the chamber is higher than that of air at atmospheric pressure to increase the drag on the projected particles along their trajectory in the chamber.
Claim 7
Dependent Claim
18 words
The process of claim 1, wherein the gaseous fluid is a gas having a higher density than air.
Claim 8
Dependent Claim
12 words
A centrifugal drier for the continuous production of dried solid particles, comprising
Claim 9
Dependent Claim
12 words
A centrifugal drier for the continuous production of dried solid particles, comprising
Claim 10
Dependent Claim
12 words
a screen in the basket for separating the liquid from the solid,
Claim 11
Dependent Claim
12 words
a screen in the basket for separating the liquid from the solid,
Claim 12
Dependent Claim
14 words
an annular housing surrounding the basket and arranged to receive the separated liquid therefrom,
Claim 13
Dependent Claim
14 words
an annular housing surrounding the basket and arranged to receive the separated liquid therefrom,
Claim 14
Dependent Claim
48 words
The centrifugal drier of claim 3, wherein the source of gas is a source of compressed air, and further comprising means for controlling the air pressure, and reservoir means connected to the source of compressed air, the first and second conduit means being connected to the reservoir means.
Claim 15
Dependent Claim
27 words
a fluid-tight, closed casing defining a chamber surrounding the housing and arranged to receive the solid particles centrifugally ejected from the basket at an outlet end thereof,
Claim 16
Dependent Claim
27 words
a fluid-tight, closed casing defining a chamber surrounding the housing and arranged to receive the solid particles centrifugally ejected from the basket at an outlet end thereof,
Claim 17
Dependent Claim
66 words
The centrifugal drier of claim 4, wherein the reservoir means comprises a supply tank for the liquid-solid mixture connected to the conduit means for supplying the liquid-solid mixture, and further comprising a variable output pump for delivering the mixture from the supply tank to the basket, and a control regulating the pump output so as to maintained a predetermined level of the mixture in the tank.
Claim 18
Dependent Claim
10 words
second conduit means for removing separated liquid from the housing,
Claim 19
Dependent Claim
10 words
second conduit means for removing separated liquid from the housing,
Claim 20
Dependent Claim
57 words
The centrifugal drier of claim 4, wherein the reservoir means comprises a drainage tank for the liquid connected to the conduit means for removing the separated liquid, and further comprising an outlet conduit for the drainage tank and a control valve in the outlet conduit for maintaining a predetermined level of the liquid in the drainage tank.
Claim 21
Dependent Claim
13 words
an outlet in the casing for removing dried solid particles from the chamber,
Claim 22
Dependent Claim
13 words
an outlet in the casing for removing dried solid particles from the chamber,
Claim 23
Dependent Claim
69 words
The centrifugal drier of claim 3, wherein the housing has an upper edge and defines a chamber fully enclosing the basket, and further comprising a skirt affixed in a fluid-tight manner to one end wall of the casing, the skirt having a lower edge defining an annular space with the upper edge of the housing, and the basket having an outlet end on a level with the annular space.
Claim 24
Dependent Claim
33 words
a source of gaseous fluid connected to the casing for maintaining a controlled pressure in the chamber, the fluid having a higher density than air at atmospheric pressure at the controlled pressure, and
Claim 25
Dependent Claim
33 words
a source of gaseous fluid connected to the casing for maintaining a controlled pressure in the chamber, the fluid having a higher density than air at atmospheric pressure at the controlled pressure, and
Claim 26
Dependent Claim
49 words
The centrifugal drier of claim 7, further comprising an annular flange at the outlet end of the basket, the annular flange extending into the annular space and the upper Edge of the housing and the lower edge of the skirt terminating close to the flange at opposite sides thereof.
Claim 27
Dependent Claim
21 words
means for preventing escape of the gaseous fluid from the casing through the first and second conduit means and the outlet.
Claim 28
Dependent Claim
21 words
means for preventing escape of the gaseous fluid from the casing through the first and second conduit means and the outlet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |