United States Patent and Trademark Office

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Color		Curly Brackets (indicating CPC extensions to IPC)

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	CPC	COOPERATIVE PATENT CLASSIFICATION

B04C

APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES (

{

centrifugal separation of water from steam B01D 45/12;

}

jet mills B02C 19/06;

{

wind sifters B07B 7/00;

}

cyclonic type combustion apparatus F23;

{

vortex burners for cyclone-type combustion apparatus F23D 1/02; cyclonic type combustion apparatus for gas turbines F23R 3/00

}

)

NOTE

This subclass covers apparatus for separating, mixing or like treating in which centrifugal effects are generated by free vortex flow, otherwise than by rotary bowls, rotors or curved passages.

B04C 1/00

Apparatus in which the main direction of flow follows a flat spiral;

{

so-called flat cyclones or vortex chambers

}

B04C 3/00

Apparatus in which the axial direction of the vortex

{

(flow following a screw-thread type line)

}

remains unchanged

{

Also devices in which one of the two discharge ducts returns centrally through the vortex chamber, a reverse-flow vortex being prevented by bulkheads in the central discharge duct (combined with other devices B04C 9/00)

}

B04C 3/02

with heating or cooling, e.g. quenching, means

B04C 3/04

Multiple arrangement thereof

{

(combined with types according to other groups, B04C 7/00)

}

B04C 3/06

Construction of inlets or outlets to the vortex chamber

B04C 5/00

Apparatus in which the axial direction of the vortex is reversed

{

(combined with other devices B04C 9/00)

}

B04C 5/02

Construction of inlets by which the vortex flow is generated

{

e.g. tangential admission, the fluid flow being forced to follow a downward path by spirally wound bulkheads, or with slightly downwardly-directed tangential admission

}

(fluid dynamics in general F15D)

B04C 5/04

. .

Tangential inlets

B04C 5/06

. .

Axial inlets

B04C 5/08

Vortex chamber constructions

B04C 5/081

. .

Shapes or dimensions

B04C 5/085

. .

with wear-resisting arrangements

B04C 5/087

. .

with flexible gas-tight walls

B04C 5/10

. .

with perforated walls

B04C 5/103

. .

Bodies or members, e.g. bulkheads, guides, in the vortex chamber (cores B04C 5/107)

B04C 5/107

. .

Cores; Devices for inducing an air-core in hydrocyclones (forming part of the outlet pipe B04C 5/13)

B04C 5/12

Construction of the overflow ducting, e.g. diffusing or spiral exits

B04C 5/13

. .

formed as a vortex finder and extending into the vortex chamber

{

(exits with bulkheads preventing reverse flow vortex B04C 3/00)

}

; Discharge from vortex finder otherwise than at the top of the cyclone; Devices for controlling the overflow

B04C 5/14

Construction of the underflow ducting; Apex constructions; Discharge arrangements;

{

discharge through sidewall provided with a few slits or perforations (provided with a great number of slits or perforations B04C 5/10)

}

B04C 5/15

. .

with swinging flaps or revolving sluices; Sluices; Check-valves

B04C 5/16

. .

with variable-size outlets from the underflow ducting

B04C 5/18

. .

with auxiliary fluid assisting discharge

B04C 5/181

. .

Bulkheads or central bodies in the discharge opening

B04C 5/185

. .

Dust collectors

B04C 5/187

. . .

forming an integral part of the vortex chamber

B04C 5/20

with heating or cooling, e.g. quenching, means

B04C 5/22

with cleaning means

B04C 5/23

. .

using liquids

B04C 5/24

Multiple arrangement thereof

{

(combination types according to other /00 groups, B04C 7/00)

}

B04C 5/26

. .

for series flow

B04C 5/28

. .

for parallel flow

B04C 5/30

. .

Recirculation constructions in or with cyclones which accomplish a partial recirculation of the medium, e.g. by means of conduits

B04C 7/00

Apparatus not provided for in group B04C 1/00, B04C 3/00, or B04C 5/00; Multiple arrangements not provided for in one of the groups B04C 1/00, B04C 3/00, or B04C 5/00; Combinations of apparatus covered by two or more of the groups B04C 1/00, B04C 3/00, or B04C 5/00

B04C 9/00

Combinations with other devices, e.g. fans,

{

expansion chambers, diffusors, water locks

}

(with filters B01D 50/00)

B04C 11/00

Accessories, e.g. safety or control devices, not otherwise provided for

{

e.g. regulators, valves in inlet or overflow ducting

}

(with electrostatic precipitating arrangements B03C 3/14)

B04C 2003/00

Apparatus in which the axial direction of the vortex

{

(flow following a screw-thread type line)

}

remains unchanged

{

}

B04C 2003/003

Shapes or dimensions of vortex chambers

B04C 2003/006

Construction of elements by which the vortex flow is generated or degenerated

B04C 2005/00

Apparatus in which the axial direction of the vortex is reversed

{

(combined with other devices B04C 9/00)

}

B04C 2005/12

Construction of the overflow ducting, e.g. diffusing or spiral exits

B04C 2005/13

. .

formed as a vortex finder and extending into the vortex chamber

{

(exits with bulkheads preventing reverse flow vortex B04C 3/00)

}

; Discharge from vortex finder otherwise than at the top of the cyclone; Devices for controlling the overflow

B04C 2005/133

. . .

Adjustable vortex finder

B04C 2005/136

. . .

Baffles in the vortex finder

B04C 2009/00

Combinations with other devices, e.g. fans,

{

expansion chambers, diffusors, water locks

}

(with filters B01D 50/00)

B04C 2009/001

with means for electrostatic separation

B04C 2009/002

with external filters

B04C 2009/004

with internal filters, in the cyclone chamber or in the vortex finder

B04C 2009/005

with external rotors, e.g. impeller, ventilator, fan, blower, pump

B04C 2009/007

with internal rotors, e.g. impeller, ventilator, fan, blower, pump

B04C 2009/008

with injection or suction of gas or liquid into the cyclone