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Color Curly Brackets (indicating CPC extensions to IPC) References Date Revised

CPC
COOPERATIVE PATENT CLASSIFICATION
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ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
NOTE
-
Attention is drawn to the notes preceding class F01 especially as regards the definitions of "machines", "pumps", "positive displacement", "rotary-piston machines", "oscillating-piston machines", "rotary piston", "co-operating members", "movement of co-operating members", "teeth or tooth-equivalents" and "internal axis".

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Rotary-piston machines or pumps (with non-parallel axes of co-operating members F04C 3/00; with the working-chamber walls at least partly resiliently deformable F04C 5/00; with fluid ring or the like F04C 7/00; rotary-piston pumps specially adapted for elastic fluids F04C 18/00; rotary-piston machines or pumps in which the working-fluid is exclusively displaced by, or exclusively displaces, one or more reciprocating pistons F04B)
NOTE
-
Group F04C 2/30 takes precedence over groups F04C 2/02 to F04C 2/28

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F04C 2/02
.
of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
F04C 2/025
. .
{
the moving and the stationary member having co-operating elements in spiral form
}
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F04C 2/04
. .
of internal axis type
F04C 2/045
. . .
{
having a C-shaped piston
}
F04C 2/06
. .
of other than internal-axis type (F04C 2/063 takes precedence)
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F04C 2/063
. .
with coaxially-mounted members having continuously-changing circumferential spacing between them
F04C 2/067
. . .
having cam-and-follower type drive
F04C 2/07
. . .
having crankshaft-and-connecting-rod type drive
F04C 2/073
. . .
having pawl-and-ratchet type drive
F04C 2/077
. . .
having toothed-gearing type drive
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.
of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
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F04C 2/082
. .
{
Details specially related to intermeshing engagement type machines or pumps
}
F04C 2/084
. . .
{
Toothed wheels
}
. . .
{
Carter
}
F04C 2/088
. . .
{
Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement
}
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F04C 2/10
. .
of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
F04C 2/101
. . .
{
with a crescent-shaped filler element, located between the inner and outer intermeshing members
}
F04C 2/102
. . .
{
the two members rotating simultaneously around their respective axes
}
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F04C 2/103
. . .
{
one member having simultaneously a rotational movement about its own axis and an orbital movement
}
F04C 2/104
. . . .
{
having an articulated driving shaft
}
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F04C 2/105
. . . .
{
Details concerning timing or distribution valves
}
F04C 2/106
. . . . .
{
Spool type distribution valves
}
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F04C 2/107
. . .
with helical teeth
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F04C 2/1071
. . . .
{
the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
}
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F04C 2/1073
. . . . .
{
where one member is stationary while the other member rotates and orbits
}
. . . . . .
{
Construction of the stationary member
}
F04C 2/1076
. . . . .
{
where one member orbits or wobbles relative to the other member which rotates around a fixed axis
}
F04C 2/1078
. . . . .
{
where one member rotates and both members are allowed to orbit or wobble
}
F04C 2/113
. . .
the inner member carrying rollers intermeshing with the outer member
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F04C 2/12
. .
of other than internal-axis type
F04C 2/123
. . .
{
with radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth
}
F04C 2/126
. . .
{
with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
}
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F04C 2/14
. . .
with toothed rotary pistons
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F04C 2/16
. . . .
with helical teeth, e.g. chevron-shaped, screw type
{
(for non-parallel axes of movement F04C 3/00)
}
F04C 2/165
. . . . .
{
having more than two rotary pistons with parallel axes
}
F04C 2/18
. . . .
with similar tooth forms (F04C 2/16 takes precedence)
F04C 2/20
. . . .
with dissimilar tooth forms (F04C 2/16 takes precedence)
F04C 2/22
.
of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth-equivalents than the outer member
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F04C 2/24
.
of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions
F04C 2/26
. .
of internal-axis type
F04C 2/28
. .
of other than internal-axis type
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F04C 2/30
.
having the characteristics covered by two or more groups F04C 2/02, F04C 2/08, F04C 2/22, F04C 2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
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F04C 2/32
. .
having both the movement defined in groups F04C 2/02 and relative reciprocation between co-operating members
F04C 2/321
. . .
{
with vanes hinged to the inner member and reciprocating with respect to the inner member
}
F04C 2/322
. . .
{
with vanes hinged to the outer member and reciprocating with respect to the outer member
}
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F04C 2/324
. . .
with vanes hinged to the inner member and reciprocating with respect to the outer member
F04C 2/328
. . . .
and hinged to the outer member
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F04C 2/332
. . .
with vanes hinged to the outer member and reciprocating with respect to the inner member
F04C 2/336
. . . .
and hinged to the inner member
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F04C 2/34
. .
having the movement defined in groups F04C 2/08 or F04C 2/22 and relative reciprocation between the co-operating members
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F04C 2/344
. . .
with vanes reciprocating with respect to the inner member
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F04C 2/3441
. . . .
{
the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
}
F04C 2/3442
. . . . .
{
the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
}
F04C 2/3443
. . . . .
{
with a separation element located between the inlet and outlet opening
}
F04C 2/3445
. . . . .
{
the vanes having the form of rollers, slippers or the like
}
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F04C 2/3446
. . . .
{
the inner and outer member being in contact along more than one line or surface
}
F04C 2/3447
. . . . .
{
the vanes having the form of rollers, slippers or the like
}
F04C 2/3448
. . . .
{
with axially movable vanes
}
F04C 2/348
. . . .
the vanes positively engaging, with circumferential play, an outer rotatable member
F04C 2/352
. . . .
the vanes being pivoted on the axis of the outer member
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F04C 2/356
. . .
with vanes reciprocating with respect to the outer member
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F04C 2/3562
. . . .
{
the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
}
F04C 2/3564
. . . . .
{
the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
}
F04C 2/3566
. . . .
{
the inner and outer member being in contact along more than one line or surface
}
F04C 2/3568
. . . .
{
with axially movable vanes
}
F04C 2/36
. .
having both the movements defined in groups F04C 2/22 and F04C 2/24
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F04C 2/38
. .
having the movement defined in group F04C 2/02 and having a hinged member (F04C 2/32 takes precedence)
F04C 2/39
. . .
with vanes hinged to the inner as well as to the outer member
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F04C 2/40
. .
having the movement defined in group F04C 2/08 or F04C 2/22 and having a hinged member
F04C 2/44
. . .
with vanes hinged to the inner member
F04C 2/46
. . .
with vanes hinged to the outer member
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Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type (with the working-chamber walls at least partly resiliently deformable F04C 5/00; rotary-piston pumps with non-parallel axes of movement of co-operating members specially adapted for elastic fluids F04C 18/48)
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F04C 3/02
.
the axes being arranged at an angle of 90 degrees
F04C 3/04
. .
of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
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F04C 3/06
.
the axes being arranged otherwise than at an angle of 90 degrees
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F04C 3/08
. .
of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
F04C 3/085
. . .
{
the axes of cooperating members being on the same plane
}
Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable (such pumps specially adapted for elastic fluids F04C 18/00)
Rotary-piston machines or pumps with fluid ring or the like (such pumps specially adapted for elastic fluids F04C 19/00)
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Oscillating-piston machines or pumps (such pumps specially adapted for elastic fluids F04C 21/00)
F04C 9/002
.
{
the piston oscillating around a fixed axis
}
.
{
the piston oscillating in the space, e.g. around a fixed point (rotary-piston machines or pumps with non-parallel axes of movement between co-operating members F04C 3/00)
}
F04C 9/007
.
{
the points of the moving element describing approximately an alternating movement in axial direction with respect to the other element
}
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Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type (combinations of such pumps specially adapted for elastic fluids F04C 23/00); Pumping installations (F04C 13/00 takes precedence; specially adapted for elastic fluids F04C 23/00; fluid gearing F16H)
NOTE
-
Multi-stage engines, motors, pumps or compressors with stages connected in series or in parallel are not considered as having complementary function

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F04C 11/001
.
{
of similar working principle
}
F04C 11/003
. .
{
having complementary function
}
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F04C 11/005
.
{
of dissimilar working principle
}
F04C 11/006
. .
{
having complementary function
}
F04C 11/008
.
{
Enclosed motor pump units
}
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Adaptations of machines or pumps for special use, e.g. for extremely high pressures (of pumps specially adapted for elastic fluids F04C 25/00)
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F04C 13/001
.
{
Pumps for particular liquids
}
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F04C 13/002
. .
{
for homogeneous viscous liquids
}
F04C 13/004
. . .
{
with means for fluidising or diluting the material being pumped
}
.
{
Removing contaminants, deposits or scale from the pump; Cleaning
}
F04C 13/007
.
{
Venting; Gas and vapour separation during pumping (preventing vapour lock in fuel pumps F02M 37/20, in centrifugal pumps F04D 9/00)
}
.
{
Pumps for submersible use, i.e. down-hole pumping
}
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Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations (of pumps or pumping installations specially adapted for elastic fluids F04C 28/00)
F04C 14/02
.
specially adapted for several machines or pumps connected in series or in parallel
F04C 14/04
.
specially adapted for reversible machines or pumps
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.
specially adapted for stopping, starting, idling or no-load operation
F04C 14/065
. .
{
Capacity control using a multiplicity of units or pumping capacities, e.g. multiple chambers, individually switchable or controllable
}
F04C 14/08
.
characterised by varying the rotational speed
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F04C 14/10
.
characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
F04C 14/12
. .
using sliding valves
F04C 14/14
. .
using rotating valves
F04C 14/16
. .
using lift valves
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.
characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F04C 14/10)
F04C 14/185
. .
{
by varying the useful pumping length of the cooperating members in the axial direction
}
F04C 14/20
. .
by changing the form of the inner or outer contour of the working chamber
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. .
by changing the eccentricity between cooperating members
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F04C 14/223
. . .
{
using a movable cam
}
F04C 14/226
. . . .
{
by pivoting the cam around an eccentric axis
}
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F04C 14/24
.
characterised by using valves regulating pressure or flow rate, e.g. discharge valves,
{
unloading valves
}
(F04C 14/10 takes precedence)
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F04C 14/26
. .
using bypass channels
F04C 14/265
. . .
{
being obtained by displacing a lateral sealing face
}
F04C 14/28
.
Safety arrangements; Monitoring
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Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C 2/00 to F04C 14/00 (of pumps specially adapted for elastic fluids F04C 18/00 to F04C 29/00)
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F04C 15/0003
.
{
Sealing arrangements in rotary-piston machines or pumps (sealing in general F16J)
}
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F04C 15/0007
. .
{
Radial sealings for working fluid
}
F04C 15/0011
. . .
{
of rigid material
}
F04C 15/0015
. . .
{
of resilient material
}
F04C 15/0019
. . .
{
Radial sealing elements specially adapted for intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
}
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F04C 15/0023
. .
{
Axial sealings for working fluid
}
F04C 15/0026
. . .
{
Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
}
F04C 15/003
. .
{
Sealings for working fluid between radially and axially moving parts
}
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F04C 15/0034
. .
{
for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
}
F04C 15/0038
. . .
{
Shaft sealings specially adapted for rotary-piston machines or pumps
}
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.
{
Systems for the equilibration of forces acting on the machines or pump (interstice adjustment other than by fluid pressure F01C 21/102)
}
. .
{
Internal leakage control
}
. .
{
Equalization of pressure pulses (silencing for compressors F04C 29/06)
}
F04C 15/0053
.
{
Venting means for starting
}
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F04C 15/0057
.
{
Driving elements, brakes, couplings, transmission specially adapted for machines or pumps (brakes, couplings, transmissions per se F16, B60)
}
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F04C 15/0061
. .
{
Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
}
. . .
{
for eccentric movement
}
F04C 15/0069
. . .
{
Magnetic couplings
}
F04C 15/0073
. . .
{
Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
}
. .
{
Fixing rotors on shafts, e.g. by clamping together hub and shaft
}
F04C 15/008
. .
{
Prime movers
}
F04C 15/0084
. .
{
Brakes, braking assemblies
}
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F04C 15/0088
.
{
Lubrication (of machines or engines in general F01M)
}
F04C 15/0092
. .
{
Control systems for the circulation of the lubricant
}
F04C 15/0096
.
{
Heating; Cooling (of machines or engines in general F01P)
}
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F04C 15/06
.
Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
F04C 15/062
. .
{
Arrangements for supercharging the working space (similar arrangements for internal combustion engines F02B 33/00, F02B 37/00)
}
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F04C 15/064
. .
{
with inlet and outlet valves specially adapted for rotary or oscillating piston machines or pumps
}
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F04C 15/066
. . .
{
of the non-return type
}
F04C 15/068
. . . .
{
of the elastic type, e.g. reed valves
}
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Rotary-piston pumps specially adapted for elastic fluids (with fluid ring or the like F04C 19/00; rotary-piston pumps in which the working-fluid is exclusively displaced by one or more reciprocating pistons F04B)
NOTE
-
Group F04C 18/30 takes precedence over groups F04C 18/02 to F04C 18/28 and F04C 18/48 to F04C 18/56.

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F04C 18/02
.
of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
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F04C 18/0207
. .
{
both members having co-operating elements in spiral form
}
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F04C 18/0215
. . .
{
where only one member is moving
}
F04C 18/0223
. . . .
{
with symmetrical double wraps
}
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F04C 18/023
. . .
{
where both members are moving
}
F04C 18/0238
. . . .
{
with symmetrical double wraps
}
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F04C 18/0246
. . .
{
Details concerning the involute wraps or their base, e.g. geometry
}
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F04C 18/0253
. . . .
{
Details concerning the base
}
F04C 18/0261
. . . . .
{
Details of the ports, e.g. location, number, geometry
}
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F04C 18/0269
. . . .
{
Details concerning the involute wraps
}
F04C 18/0276
. . . . .
{
Different wall heights
}
F04C 18/0284
. . . . .
{
Details of the wrap tips
}
F04C 18/0292
. . . . .
{
Ports or channels located in the wrap
}
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F04C 18/04
. .
of internal-axis type
F04C 18/045
. . .
{
having a C-shaped piston
}
F04C 18/06
. .
of other than internal-axis type
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F04C 18/063
. .
with coaxially-mounted members having continuously-changing circumferential spacing between them
F04C 18/067
. . .
having cam-and-follower type drive
F04C 18/07
. . .
having crankshaft-and-connecting-rod type drive
F04C 18/073
. . .
having pawl-and-ratchet type drive
F04C 18/077
. . .
having toothed-gearing type drive
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.
of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
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F04C 18/082
. .
{
Details specially related to intermeshing engagement type pumps
}
F04C 18/084
. . .
{
Toothed wheels
}
. . .
{
Carter
}
F04C 18/088
. . .
{
Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement
}
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F04C 18/10
. .
of internal-axis type with the outer member having more teeth or tooth equivalents, e.g. rollers, than the inner member
F04C 18/103
. . .
{
with a crescent shaped filler element, located between the inner and outer intermeshing elements
}
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F04C 18/107
. . .
with helical teeth
F04C 18/1075
. . . .
{
the inner and outer member having a different number of threads and one of the two being made of elastic material, e.g. Moineau type
}
F04C 18/113
. . .
the inner member carrying rollers intermeshing with the outer member
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F04C 18/12
. .
of other than internal-axis type
F04C 18/123
. . .
{
with radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth
}
F04C 18/126
. . .
{
with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
}
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F04C 18/14
. . .
with toothed rotary pistons
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F04C 18/16
. . . .
with helical teeth, e.g. chevron-shaped, screw type
{
(for non-parallel axes of movement F04C 18/48)
}
F04C 18/165
. . . . .
{
having more than two rotary pistons with parallel axes
}
F04C 18/18
. . . .
with similar tooth forms (F04C 18/16 takes precedence)
F04C 18/20
. . . .
with dissimilar tooth forms (F04C 18/16 takes precedence)
F04C 18/22
.
of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth equivalents than the outer member
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F04C 18/24
.
of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions
F04C 18/26
. .
of internal-axis type
F04C 18/28
. .
of other than internal-axis type
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F04C 18/30
.
having the characteristics covered by two or more of groups F04C 18/02, F04C 18/08, F04C 18/22, F04C 18/24, F04C 18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
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F04C 18/32
. .
having both the movement defined in group F04C 18/02 and relative reciprocation between the co-operating members
F04C 18/321
. . .
{
with vanes hinged to the inner member and reciprocating with respect to the inner member
}
F04C 18/322
. . .
{
with vanes hinged to the outer member and reciprocating with respect to the outer member
}
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F04C 18/324
. . .
with vanes hinged to the inner member and reciprocating with respect to the outer member
F04C 18/328
. . . .
and hinged to the outer member
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F04C 18/332
. . .
with vanes hinged to the outer member and reciprocating with respect to the inner member
F04C 18/336
. . . .
and hinged to the inner member
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F04C 18/34
. .
having the movement defined in group F04C 18/08 or F04C 18/22 and relative reciprocation between the co-operating members
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F04C 18/344
. . .
with vanes reciprocating with respect to the inner member
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F04C 18/3441
. . . .
{
the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
}
F04C 18/3442
. . . . .
{
the surfaces of the inner and outer member, forming the inlet and outlet opening
}
F04C 18/3443
. . . . .
{
with a separation element located between the inlet and outlet opening
}
F04C 18/3445
. . . . .
{
the vanes having the form of rollers, slippers or the like
}
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F04C 18/3446
. . . .
{
the inner and outer member being in contact along more than one line or surface
}
F04C 18/3447
. . . . .
{
the vanes having the form of rollers, slippers or the like
}
F04C 18/3448
. . . .
{
with axially movable vanes
}
F04C 18/348
. . . .
the vanes positively engaging, with circumferential play, an outer rotatable member
F04C 18/352
. . . .
the vanes being pivoted on the axis of the outer member
Collapse
F04C 18/356
. . .
with vanes reciprocating with respect to the outer member
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F04C 18/3562
. . . .
{
the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation
}
F04C 18/3564
. . . . .
{
the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
}
F04C 18/3566
. . . .
{
the inner and outer member being in contact along more than line or surface
}
F04C 18/3568
. . . .
{
with axially movable vanes
}
F04C 18/36
. .
having both the movement defined in groups F04C 18/22 and F04C 18/24
Collapse
F04C 18/38
. .
having the movement defined in group F04C 18/02 and having a hinged member (F04C 18/32 takes precedence)
F04C 18/39
. . .
with vanes hinged to the inner as well as to the outer member
Collapse
F04C 18/40
. .
having the movement defined in group F04C 18/08 or F04C 18/22 and having a hinged member
F04C 18/44
. . .
with vanes hinged to the inner member
F04C 18/46
. . .
with vanes hinged to the outer member
Collapse
F04C 18/48
.
Rotary-piston pumps with non-parallel axes of movement of co-operating members
Collapse
F04C 18/50
. .
the axes being arranged at an angle of 90 degrees
F04C 18/52
. . .
of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
Collapse
F04C 18/54
. .
the axes being arranged otherwise than at an angle of 90 degrees
Collapse
F04C 18/56
. . .
of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
F04C 18/565
. . . .
{
the axes of cooperating members being on the same plane
}
Collapse
Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
F04C 19/001
.
{
General arrangements, plants, flowsheets
}
F04C 19/002
.
{
with rotating outer members
}
F04C 19/004
.
{
Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply
}
Collapse
F04C 19/005
.
{
Details concerning the admission or discharge
}
F04C 19/007
. .
{
Port members in the form of side plates
}
F04C 19/008
. .
{
Port members in the form of conical or cylindrical pieces situated in the centre of the impeller
}
Collapse
Oscillating-piston pumps specially adapted for elastic fluids
F04C 21/002
.
{
the piston oscillating around a fixed axis
}
.
{
the piston oscillating in the space, e.g. around a fixed point (rotary-piston pumps with non-parallel axes of rotation between co-operating members F04C 18/48)
}
F04C 21/007
.
{
the points of the moving element describing approximately an alternating movement in axial direction with respect to the other element
}
Collapse
Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids (F04C 25/00 takes precedence)
NOTE
-
Multi-stage pumps or compressors with stages connected in series or in parallel are not considered as having complementary function

Collapse
F04C 23/001
.
{
of similar working principle
}
F04C 23/003
. .
{
having complementary function
}
Collapse
F04C 23/005
.
{
of dissimilar working principle
}
F04C 23/006
. .
{
having complementary function
}
F04C 23/008
.
{
Hermetic pumps
}
NOTE
-
Multi-stage steam engines, motors, pumps or compressors with stages connected in series or in parallel are not considered as having complementary function

F04C 23/02
.
Pumps characterised by combination with or adaptation to specific driving engines or motors (predominant aspects of the engines or motors, see the relevant classes)
Collapse
Adaptations of pumps for special use of pumps for elastic fluids
.
for producing high vacuum (sealing arrangements F04C 27/00; silencing F04C 29/06)
Collapse
Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
Collapse
F04C 27/001
.
{
Radial sealings for working fluid
}
F04C 27/002
. .
{
of rigid material
}
F04C 27/003
. .
{
of resilient material
}
F04C 27/004
. .
{
Radial sealing elements specially adapted for intermeshing-engagement type pumps, e.g. gear pumps
}
Collapse
.
{
Axial sealings for working fluid
}
F04C 27/006
. .
{
Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type pumps, e.g. gear pumps
}
F04C 27/007
.
{
Sealings for working fluid between radially and axially moving parts
}
Collapse
F04C 27/008
.
{
for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
}
F04C 27/009
. .
{
Shaft sealings specially adapted for pumps
}
F04C 27/02
.
Liquid sealing for high-vacuum pumps
{
or for compressors
}
Collapse
Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
F04C 28/02
.
specially adapted for several pumps connected in series or in parallel
F04C 28/04
.
specially adapted for reversible pumps
Collapse
.
specially adapted for stopping, starting, idling or no-load operation
F04C 28/065
. .
{
Capacity control using a multiplicity of units or pumping capacities, e.g. multiple chambers, individually switchable or controllable
}
F04C 28/08
.
characterised by varying the rotational speed
Collapse
F04C 28/10
.
characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
Collapse
F04C 28/12
. .
using sliding valves
F04C 28/125
. . .
{
with sliding valves controlled by the use of fluid other than the working fluid
}
F04C 28/14
. .
using rotating valves
. .
using lift valves
Collapse
.
characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F04C 28/10)
F04C 28/185
. .
{
by varying the useful pumping length of the cooperating members in the axial direction
}
F04C 28/20
. .
by changing the form of the inner or outer contour of the working chamber
F04C 28/22
. .
by changing the eccentricity between cooperating members
Collapse
F04C 28/24
.
characterised by using valves regulating pressure or flow rate, e.g. discharge valves
{
unloading valves
}
(F04C 28/10 takes precedence)
Collapse
F04C 28/26
. .
using bypass channels
F04C 28/265
. . .
{
being obtained by displacing a lateral sealing face
}
F04C 28/28
.
Safety arrangements; Monitoring
Collapse
Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C 18/00 to F04C 28/00
Collapse
F04C 29/0007
.
{
Injection of a fluid in the working chamber for sealing, cooling and lubricating (sealing only F04C 27/00; lubrication only F04C 29/02; cooling F02B 47/02, F02D 21/00, F02M 25/00)
}
F04C 29/0014
. .
{
with control systems for the injection of the fluid
}
Collapse
F04C 29/0021
.
{
Systems for the equilibration of forces acting on the pump
}
(interstice adjustment other than by fluid pressure F01C 21/102)
F04C 29/0028
. .
{
Internal leakage control
}
. .
{
Equalization of pressure pulses (silencing F04C 29/06)
}
Collapse
F04C 29/0042
.
{
Driving elements, brakes, couplings, transmissions specially adapted for pumps (brakes, couplings, transmissions per se F16, B60)
}
Collapse
F04C 29/005
. .
{
Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
}
. . .
{
for eccentric movement
}
F04C 29/0064
. . .
{
Magnetic couplings
}
F04C 29/0071
. . .
{
Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
}
. .
{
Fixing rotors on shafts, e.g. by clamping together hub and shaft
}
F04C 29/0085
. .
{
Prime movers
}
.
{
Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning
}
Collapse
.
Lubrication (of machines or engines in general F01M); Lubricant separation (separation in general B01D)
F04C 29/021
. .
{
Control systems for the circulation of the lubricant
}
F04C 29/023
. .
{
Lubricant distribution through a hollow driving shaft (F04C 29/025 takes precedence)
}
F04C 29/025
. .
{
using a lubricant pump
}
F04C 29/026
. .
{
Lubricant separation
}
F04C 29/028
. .
{
Means for improving or restricting lubricant flow
}
Collapse
.
Heating; Cooling (of machines or engines in general F01P); Heat insulation (heat insulation in general F16L 59/00)
F04C 29/042
. .
{
by injecting a fluid (injection of fluid for sealing, cooling or lubrication F04C 29/0007)
}
F04C 29/045
. .
{
of the electric motor in hermetic pumps
}
F04C 29/047
. .
{
Cooling of electronic devices installed inside the pump housing, e.g. inverters
}
WARNING
-
WARNING this group is pending a reorganisation, see also F04C 29/04

Collapse
.
Silencing (gas-flow silencers or exhaust apparatus for machines or engines in general F01N)
WARNING
-
{
WARNING Subgroups F04C 29/061 to F04C 29/068 pending a reorganisation, see also F04C 29/06
}

F04C 29/061
. .
{
Silencers using overlapping frequencies, e.g. Helmholtz resonators
}
F04C 29/063
. .
{
Sound absorbing materials
}
Collapse
F04C 29/065
. .
{
Noise dampening volumes, e.g. muffler chambers
}
F04C 29/066
. . .
{
with means to enclose the source of noise
}
F04C 29/068
. .
{
the silencing means being arranged inside the pump housing
}
Collapse
F04C 29/12
.
Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
F04C 29/122
. .
{
Arrangements for supercharging the working space (similar arrangements for internal combustion engines F02B 33/00, F02B 37/00)
}
Collapse
F04C 29/124
. .
{
with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
}
Collapse
F04C 29/126
. . .
{
of the non-return type
}
F04C 29/128
. . . .
{
of the elastic type, e.g. reed valves
}
Collapse
Fluid
Collapse
F04C 2210/10
.
working
F04C 2210/1005
. .
Air
F04C 2210/1011
. .
Amine
F04C 2210/1016
. .
Blood
F04C 2210/1022
. .
C3HmFn
F04C 2210/1027
. .
CO2
F04C 2210/1033
. .
Concrete
F04C 2210/1038
. .
Cooking oil
F04C 2210/1044
. .
Fuel
F04C 2210/105
. .
Helium (He)
F04C 2210/1055
. .
Hydrogen (H2)
F04C 2210/1061
. .
LPG
F04C 2210/1066
. .
Nitrogen (N2)
F04C 2210/1072
. .
Oxygen (O2)
F04C 2210/1077
. .
Steam
F04C 2210/1083
. .
Urea
F04C 2210/1088
. .
Vegetable oil
F04C 2210/1094
. .
Water
Collapse
F04C 2210/12
.
auxiliary
F04C 2210/122
. .
Nitrogen (N2)
F04C 2210/124
. .
Sodium (Na)
F04C 2210/126
. .
Tin
F04C 2210/128
. .
Water
Collapse
F04C 2210/14
.
Lubricant
F04C 2210/142
. .
Ester
F04C 2210/145
. .
PAG
F04C 2210/147
. .
Water
Collapse
F04C 2210/20
.
liquid, i.e. incompressible
F04C 2210/201
. .
DME
F04C 2210/203
. .
Fuel
F04C 2210/205
. .
Ink
F04C 2210/206
. .
Oil
F04C 2210/208
. .
Water
Collapse
F04C 2210/22
.
gaseous, i.e. compressible
F04C 2210/221
. .
Air
F04C 2210/222
. .
Carbon dioxide (CO2)
F04C 2210/224
. .
Hydrogen (H2)
F04C 2210/225
. .
Nitrogen (N2)
F04C 2210/227
. .
Steam
F04C 2210/228
. .
Vapour
Collapse
F04C 2210/24
.
mixed, e.g. two-phase fluid
F04C 2210/242
. .
Steam
F04C 2210/245
. .
Vapour
F04C 2210/247
. .
Water
Collapse
F04C 2210/26
.
Refrigerants with particular properties, e.g. HFC-134a
F04C 2210/261
. .
Carbon dioxide (CO2)
F04C 2210/263
. .
HFO1234YF
F04C 2210/265
. .
Ammoniac (NH3)
F04C 2210/266
. .
Propane
F04C 2210/268
. .
R32
Collapse
F04C 2210/40
.
Properties
F04C 2210/42
. .
magnetic or ferromagnetic; Ferrofluids
F04C 2210/44
. .
Viscosity
Collapse
F04C 2210/60
.
Condition
F04C 2210/62
. .
Purity
Collapse
Application
Collapse
F04C 2220/10
.
Vacuum
F04C 2220/12
. .
Dry running
F04C 2220/20
.
Pumps with means for separating and evacuating the gaseous phase
F04C 2220/22
.
for very low temperatures, i.e. cryogenic
F04C 2220/24
.
for metering throughflow
F04C 2220/26
.
for step-by-step output movement
F04C 2220/28
.
for pulsed fluid flow
F04C 2220/30
.
Use in a chemical vapor deposition (CVD) process or in a similar process
F04C 2220/40
.
Pumps with means for venting areas other than the working chamber, e.g. bearings, gear chambers, shaft seals
F04C 2220/50
.
Pumps with means for introducing gas under pressure for ballasting
Collapse
Manufacture
NOTE
-
Manufacture comprises also treatment, assembly or disassembly methods, repairing, handling or the like.

Collapse
F04C 2230/10
.
by removing material
F04C 2230/101
. .
by electrochemical methods
F04C 2230/102
. .
by spark erosion methods
F04C 2230/103
. .
using lasers
Collapse
F04C 2230/20
.
essentially without removing material
F04C 2230/21
. .
by casting
F04C 2230/22
. .
by sintering
Collapse
F04C 2230/23
. .
by permanently joining parts together
F04C 2230/231
. . .
by welding
F04C 2230/24
. .
by extrusion
F04C 2230/25
. .
by forging
F04C 2230/26
. .
by rolling
F04C 2230/27
. .
by hydroforming
Collapse
F04C 2230/40
.
Heat treatment
F04C 2230/41
. .
Hardening; Annealing
Collapse
F04C 2230/60
.
Assembly methods
F04C 2230/601
. .
Adjustment
F04C 2230/602
. .
Gap; Clearance
F04C 2230/603
. .
Centering; Aligning
F04C 2230/604
. .
Mounting devices for pumps or compressors
F04C 2230/605
. .
Balancing
F04C 2230/70
.
Disassembly methods
F04C 2230/80
.
Repairing methods
F04C 2230/85
.
Methods for improvement by repair or exchange of parts
Collapse
F04C 2230/90
.
Improving properties of machine parts
F04C 2230/91
. .
Coating
F04C 2230/92
. .
Surface treatment
Collapse
Components
Collapse
F04C 2240/10
.
Stators
F04C 2240/102
. .
with means for discharging condensate or liquid separated from the gas pumped
F04C 2240/20
.
Rotors
F04C 2240/30
.
Casings or housings
Collapse
F04C 2240/40
.
Electric motor
F04C 2240/401
. .
Linear motor
F04C 2240/402
. .
Plurality of electronically synchronised motors
F04C 2240/403
. .
with inverter for speed control
F04C 2240/45
.
Hybrid prime mover
Collapse
F04C 2240/50
.
Bearings
F04C 2240/51
. .
for cantilever assemblies
F04C 2240/52
. .
for assemblies with supports on both sides
F04C 2240/54
. .
Hydrostatic or hydrodynamic bearing assemblies specially adapted for rotary positive displacement pumps or compressors
F04C 2240/56
. .
Bearing bushings or details thereof
Collapse
F04C 2240/60
.
Shafts
F04C 2240/601
. .
Shaft flexion
F04C 2240/603
. .
with internal channels for fluid distribution, e.g. hollow shaft
F04C 2240/605
. .
Shaft sleeves or details thereof
F04C 2240/70
.
Use of multiplicity of similar components; Modular construction
Collapse
F04C 2240/80
.
Other components
F04C 2240/801
. .
Wear plates
F04C 2240/802
. .
Liners
F04C 2240/803
. .
Electric connectors or cables; Fittings therefor
F04C 2240/804
. .
Accumulators for refrigerant circuits
F04C 2240/805
. .
Fastening means, e.g. bolts
F04C 2240/806
. .
Pipes for fluids; Fittings therefor
F04C 2240/807
. .
Balance weight, counterweight
F04C 2240/808
. .
Electronic circuits (e.g. inverters) installed inside the machine
F04C 2240/809
. .
Lubricant sump
F04C 2240/81
. .
Sensor, e.g. electronic sensor for control or monitoring
F04C 2240/811
. .
Actuator for control, e.g. pneumatic, hydraulic, electric
Collapse
Geometry
Collapse
F04C 2250/10
.
of the inlet or outlet
F04C 2250/101
. .
of the inlet
F04C 2250/102
. .
of the outlet
Collapse
F04C 2250/20
.
of the rotor
F04C 2250/201
. .
conical shape
Collapse
F04C 2250/30
.
of the stator
F04C 2250/301
. .
compression chamber profile defined by a mathematical expression or by parameters
Collapse
Control; Monitoring or safety arrangements
Collapse
F04C 2270/01
.
Load
F04C 2270/015
. .
Controlled or regulated
Collapse
F04C 2270/02
.
Power
F04C 2270/025
. .
Controlled or regulated
Collapse
F04C 2270/03
.
Torque
F04C 2270/035
. .
Controlled or regulated
Collapse
F04C 2270/04
.
Force
F04C 2270/041
. .
Controlled or regulated
Collapse
F04C 2270/042
. .
radial
F04C 2270/0421
. . .
Controlled or regulated
Collapse
F04C 2270/0422
. . .
centrifugal
F04C 2270/04225
. . . .
Controlled or regulated
Collapse
F04C 2270/044
. .
axial
F04C 2270/0445
. . .
Controlled or regulated
Collapse
F04C 2270/05
.
Speed
F04C 2270/051
. .
Controlled or regulated
Collapse
F04C 2270/052
. .
angular
F04C 2270/0525
. . .
Controlled or regulated
Collapse
F04C 2270/054
. .
linear
F04C 2270/0545
. . .
Controlled or regulated
Collapse
F04C 2270/06
.
Acceleration
F04C 2270/065
. .
Controlled or regulated
Collapse
F04C 2270/07
.
Electric current
F04C 2270/075
. .
Controlled or regulated
Collapse
F04C 2270/08
.
Amplitude of electric current
F04C 2270/085
. .
Controlled or regulated
Collapse
F04C 2270/09
.
Electric current frequency
F04C 2270/095
. .
Controlled or regulated
Collapse
F04C 2270/10
.
Voltage
F04C 2270/105
. .
Controlled or regulated
Collapse
F04C 2270/11
.
Magnetic flux
F04C 2270/115
. .
Controlled or regulated
Collapse
F04C 2270/12
.
Vibration
F04C 2270/125
. .
Controlled or regulated
Collapse
F04C 2270/13
.
Noise
F04C 2270/135
. .
Controlled or regulated
Collapse
F04C 2270/14
.
Pulsations
F04C 2270/145
. .
Controlled or regulated
Collapse
F04C 2270/15
.
Resonance
F04C 2270/155
. .
Controlled or regulated
Collapse
F04C 2270/16
.
Wear
F04C 2270/165
. .
Controlled or regulated
Collapse
F04C 2270/17
.
Tolerance; Play; Gap
F04C 2270/175
. .
Controlled or regulated
Collapse
F04C 2270/18
.
Pressure
F04C 2270/185
. .
Controlled or regulated
Collapse
F04C 2270/19
.
Temperature
F04C 2270/195
. .
Controlled or regulated
Collapse
F04C 2270/20
.
Flow
F04C 2270/205
. .
Controlled or regulated
Collapse
F04C 2270/21
.
Pressure difference
F04C 2270/215
. .
Controlled or regulated
Collapse
F04C 2270/22
.
Temperature difference
F04C 2270/225
. .
Controlled or regulated
F04C 2270/23
.
Working cycle timing control
F04C 2270/24
.
Level of liquid, e.g. lubricant or cooling liquid
F04C 2270/40
.
Conditions across a pump or machine
F04C 2270/42
.
Conditions at the inlet of a pump or machine
F04C 2270/44
.
Conditions at the outlet of a pump or machine
F04C 2270/46
.
Conditions in the working chamber
F04C 2270/48
.
Conditions of a reservoir linked to a pump or machine
F04C 2270/50
.
Conditions before a throttle
F04C 2270/52
.
Conditions after a throttle
F04C 2270/54
.
Conditions in a control cylinder/piston unit
F04C 2270/56
.
Number of pump/machine units in operation
Collapse
F04C 2270/58
.
Valve parameters
F04C 2270/585
. .
Controlled or regulated
Collapse
F04C 2270/60
.
Prime mover parameters
F04C 2270/605
. .
Controlled or regulated
Collapse
F04C 2270/70
.
Safety, emergency conditions or requirements
F04C 2270/701
. .
Cold start
F04C 2270/72
. .
preventing reverse rotation
Collapse
F04C 2270/78
.
Warnings
F04C 2270/782
. .
Sound
F04C 2270/784
. .
Light
F04C 2270/80
.
Diagnostics
F04C 2270/86
.
Detection
F04C 2270/90
.
Remote control, e.g. wireless, via LAN, by radio, or by a wired connection from a central computer
Collapse
F04C 2280/00
Arrangements for preventing or removing deposits or corrosion
F04C 2280/02
.
Preventing solid deposits in pumps, e.g. in vacuum pumps with chemical vapour deposition (CVD) processes
F04C 2280/04
.
Preventing corrosion
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013