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CPC
COOPERATIVE PATENT CLASSIFICATION
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F04C
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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F04C 2/00
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
}
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F04C 2/06
. .
of other than internal-axis type
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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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F04C 2/08
.
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
}
F04C 2/086
. . .
{
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
}
F04C 2/1075
. . . . . .
{
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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F04C 3/00
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
}
F04C 5/00
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)
F04C 7/00
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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F04C 9/00
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
}
F04C 9/005
.
{
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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F04C 11/00
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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F04C 13/00
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
}
F04C 13/005
.
{
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)
}
F04C 13/008
.
{
Pumps for submersible use, i.e. down-hole pumping
}
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F04C 14/00
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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F04C 14/06
.
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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F04C 14/18
.
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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F04C 14/22
. .
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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F04C 15/00
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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F04C 15/0042
.
{
Systems for the equilibration of forces acting on the machines or pump (interstice adjustment other than by fluid pressure F01C 21/102)
}
F04C 15/0046
. .
{
Internal leakage control
}
F04C 15/0049
. .
{
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
}
F04C 15/0065
. . .
{
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
}
F04C 15/0076
. .
{
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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F04C 18/00
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
Collapse
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
}
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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
Collapse
F04C 18/08
.
of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
Collapse
F04C 18/082
. .
{
Details specially related to intermeshing engagement type pumps
}
F04C 18/084
. . .
{
Toothed wheels
}
F04C 18/086
. . .
{
Carter
}
F04C 18/088
. . .
{
Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement
}
Collapse
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
}
Collapse
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
Collapse
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
}
Collapse
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
Collapse
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
Collapse
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
Collapse
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
Collapse
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
F04C 19/00
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
F04C 21/00
Oscillating-piston pumps specially adapted for elastic fluids
F04C 21/002
.
{
the piston oscillating around a fixed axis
}
F04C 21/005
.
{
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
F04C 23/00
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
F04C 25/00
Adaptations of pumps for special use of pumps for elastic fluids
F04C 25/02
.
for producing high vacuum (sealing arrangements F04C 27/00; silencing F04C 29/06)
Collapse
F04C 27/00
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
F04C 27/005
.
{
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
F04C 28/00
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
F04C 28/06
.
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
F04C 28/16
. .
using lift valves
Collapse
F04C 28/18
.
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
F04C 29/00
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
}
F04C 29/0035
. .
{
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
}
F04C 29/0057
. . .
{
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
}
F04C 29/0078
. .
{
Fixing rotors on shafts, e.g. by clamping together hub and shaft
}
F04C 29/0085
. .
{
Prime movers
}
F04C 29/0092
.
{
Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning
}
Collapse
F04C 29/02
.
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
F04C 29/04
.
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
F04C 29/06
.
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
F04C 2210/00
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
F04C 2220/00
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
F04C 2230/00
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
F04C 2240/00
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
F04C 2250/00
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
F04C 2270/00
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: 04/16/2013 4:31:16 PM