US3764006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclonic separator with liquid flow added axially
Assignee: Individual
•
Filing: 1971-04-01
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Granted: 1973-10-09
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Expires: 1991-04-01
Abstract
Abstract A process is provided for separating from cellulose fiber suspensions particles lighter than or having approximately the same density as the fibers, which comprises subjecting the fiber suspension to centrifugal forces, so as to concentrate the heavier particles in liquid in a peripheral zone and concentrate the lighter particles including fibers in liquid in a central zone of the suspension, withdrawing liquid with the heavier particles from one end of the peripheral zone, withdrawing liquid with the fibers from the opposite end of the central zone, introducing additional liquid into the central zone of the suspension, and directing the flow of such axially in the direction of liquid flow in the peripheral zone. Apparatus also is provided in the form of a cyclonic separator having an inlet in axial alignment with the apex end outlet for introducing additional liquid into the central portion of the chamber as an axial flow directed towards the outlet at the apex end of the housing.
Inventors
- 👤 N Wikdahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:11
CPC Classifications
B; B04; B04C; B04C9/00; B04C5/00; B04C5/12; D; D21; D21D; D21D5/00; D21D5/18
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
245 words
A process for separating from fiber suspensions dirt and contaminant material having a density approximating or lighter than the fibers, which comprises centrifugally separating in a cyclonic zone which is at least in part cone-shaped a fibrous suspensions containing light and heavy dirt and contaminant particles into a heavy fraction comprising heavy particles in a peripheral portion of the zone, and a light fraction comprising fibers and light particles in a central portion of the zone; withdrawing heavy fraction from the peripheral portion of the zone at apex end thereof; withdrawing light fraction from the central portion of the zone at the opposite end thereof; causing heavy fraction in the peripheral portion to move in one direction, towards the point of its withdrawal from the zone, and causing light fraction in the central portion to move in the opposite direction, towards the point of its withdrawal from the zone; directing a core flow of liquid axially through the central portion of the zone and in a direction opposed to the flow of light fraction in the central portion and in the same direction as the flow of heavy fraction in the peripheral portion of the zone; entraining in such core flow light dirt and contaminant particles having a slender or flat surface configuration from the central portion of the zone, anD thereby separating such particles from the fibers there, and withdrawing the core flow with the heavy fraction from the peripheral portion of the zone.
Claim 2
Dependent Claim
245 words
A process for separating from fiber suspensions dirt and contaminant material having a density approximating or lighter than the fibers, which comprises centrifugally separating in a cyclonic zone which is at least in part cone-shaped a fibrous suspensions containing light and heavy dirt and contaminant particles into a heavy fraction comprising heavy particles in a peripheral portion of the zone, and a light fraction comprising fibers and light particles in a central portion of the zone; withdrawing heavy fraction from the peripheral portion of the zone at apex end thereof; withdrawing light fraction from the central portion of the zone at the opposite end thereof; causing heavy fraction in the peripheral portion to move in one direction, towards the point of its withdrawal from the zone, and causing light fraction in the central portion to move in the opposite direction, towards the point of its withdrawal from the zone; directing a core flow of liquid axially through the central portion of the zone and in a direction opposed to the flow of light fraction in the central portion and in the same direction as the flow of heavy fraction in the peripheral portion of the zone; entraining in such core flow light dirt and contaminant particles having a slender or flat surface configuration from the central portion of the zone, anD thereby separating such particles from the fibers there, and withdrawing the core flow with the heavy fraction from the peripheral portion of the zone.
Claim 3
Dependent Claim
27 words
A process according to claim 1 in which the fiber suspension is an aqueous cellulose fiber suspension, and the dirt and contaminant material include shives and splinters.
Claim 4
Dependent Claim
40 words
A process according to claim 1 in which the proportion of liquid introduced as core flow is in a volume within the range from about 5 percent to about 50 percent by volume of the fiber suspension being centrifugally separated.
Claim 5
Dependent Claim
13 words
A process according to claim 1 in which the core liquid is water.
Claim 6
Dependent Claim
19 words
A process according to claim 1 in which the core liquid is fiber-containing liquid withdrawn from the central zone.
Claim 7
Dependent Claim
35 words
A process according to claim 5 in which the fiber suspension is processed through a multiplicity of separation stages, and the core liquid is fiber-containing liquid withdrawn from the central zone of another separation stage.
Claim 8
Dependent Claim
23 words
A process according to claim 5 in which the core liquid is fiber-containing liquid withdrawn from the central zone of the same separation.
Claim 9
Dependent Claim
204 words
A cyclonic separator comprising a housing with a separator chamber therein that is circular in cross-section, has an apex end and a base end, and is cone-shaped at least in part; at least one fluid inlet through the housing at the base end, arranged for tangential flow of fluid into the chamber, to establish a vortical fluid flow in the chamber; an outlet through the housing in axial alignment to the chamber at the base end of the chamber; and an outlet through the housing in axial alignment to the chamber at the apex end of the chamber; the apex end outlet receiving peripheral zone vortical fluid flow from the chamber, and the base end outlet receiving central zone vortical fluid flow from the chamber; a core flow inlet in axial alignment with the apex end outlet for introducing liquid axially within the core of the vortical fluid flow in the chamber in the direction of the apex end outlet; a light-fraction-receiving chamber in fluid flow connection with the base end outlet; and a fluid flow connection between the light-fraction-receiving chamber and the core flow inlet, for recirculating liquid in the light-fraction-receiving chamber to the core of vortical fluid flow in the separation chamber.
Claim 10
Dependent Claim
204 words
A cyclonic separator comprising a housing with a separator chamber therein that is circular in cross-section, has an apex end and a base end, and is cone-shaped at least in part; at least one fluid inlet through the housing at the base end, arranged for tangential flow of fluid into the chamber, to establish a vortical fluid flow in the chamber; an outlet through the housing in axial alignment to the chamber at the base end of the chamber; and an outlet through the housing in axial alignment to the chamber at the apex end of the chamber; the apex end outlet receiving peripheral zone vortical fluid flow from the chamber, and the base end outlet receiving central zone vortical fluid flow from the chamber; a core flow inlet in axial alignment with the apex end outlet for introducing liquid axially within the core of the vortical fluid flow in the chamber in the direction of the apex end outlet; a light-fraction-receiving chamber in fluid flow connection with the base end outlet; and a fluid flow connection between the light-fraction-receiving chamber and the core flow inlet, for recirculating liquid in the light-fraction-receiving chamber to the core of vortical fluid flow in the separation chamber.
Claim 11
Dependent Claim
44 words
A cyclonic separator according to claim 8, comprising a cascade series of cyclonic separators interconnected in a manner such that the base outlet from each successive separator is combined in series with a tangential or core inlet of an earlier separator in the series.
Claim 12
Dependent Claim
35 words
A cyclonic separator according to claim 8 wherein a tubular baffle extends from the base outlet into the separator chamber to a point beyond the inlet, to deflect inlet flow away from the base outlet.
Claim 13
Dependent Claim
22 words
A cyclonic separator according to claim 8, in which the sides of the separator chamber define a straight- and smooth-sided conical space.
Claim 14
Dependent Claim
21 words
A cyclonic separator according to claim 8, in which the tangential inlets are at least two in number, and uniformly spaced.
Claim 15
Dependent Claim
19 words
A vortex separator according to claim 8, in which the chamber is conical at least in a major portion.
Claim 16
Dependent Claim
27 words
A cyclonic separator according to claim 8, in which the core flow inlet is in the form of a conduit coaxially disposed in the base end outlet.
Claim 17
Dependent Claim
34 words
A cyclonic separator according to claim 8, in which the base end outlet for light fraction includes an orifice producing pressure in the light-fraction-receiving chamber which is higher than that in the separator chamber.
Claim 18
Dependent Claim
18 words
A cyclonic separator according to claim 15, in which the orifice is in the form of a venturi.
Claim 19
Dependent Claim
38 words
A cyclonic separator according to claim 15, in which the base end outlet, beyond the orifice, is provided with a baffle to arrest spiraling movement of fluid passing through the outlet, and increase pressure in the light-fraction-receiving chamber.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |