F04C

ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS engines F03C

ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

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".

In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.

F04C2/00

Rotary-piston machines or pumps with non-parallel axes of co-operating members F04C3/00; with the working-chamber walls at least partly resiliently deformable F04C5/00; with fluid ring or the like F04C7/00; rotary-piston pumps specially adapted for elastic fluids F04C18/00; rotary-piston machines or pumps in which the working-fluid is exclusively displaced by, or exclusively displaces, one or more reciprocating pistons F04B

Group F04C2/30 takes precedence over groups F04C2/02 - F04C2/28

F04C2/02

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

F04C2/025

the moving and the stationary member having co-operating elements in spiral form

F04C2/04

of internal axis type

F04C2/045

having a C-shaped piston

F04C2/06

of other than internal-axis type F04C2/063 takes precedence

F04C2/063

with coaxially-mounted members having continuously-changing circumferential spacing between them

F04C2/067

having cam-and-follower type drive

F04C2/07

having crankshaft-and-connecting-rod type drive

F04C2/073

having pawl-and-ratchet type drive

F04C2/077

having toothed-gearing type drive

F04C2/08

of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

F04C2/082

Details specially related to intermeshing engagement type machines or pumps

F04C2/084

Toothed wheels

F04C2/086

Carter

F04C2/088

Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement

F04C2/10

of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member

F04C2/101

with a crescent-shaped filler element, located between the inner and outer intermeshing members

F04C2/102

the two members rotating simultaneously around their respective axes

F04C2/103

one member having simultaneously a rotational movement about its own axis and an orbital movement

F04C2/104

having an articulated driving shaft

F04C2/105

Details concerning timing or distribution valves

F04C2/106

Spool type distribution valves

F04C2/107

with helical teeth

F04C2/1071

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

F04C2/1073

where one member is stationary while the other member rotates and orbits

F04C2/1075

Construction of the stationary member

F04C2/1076

where one member orbits or wobbles relative to the other member which rotates around a fixed axis

F04C2/1078

where one member rotates and both members are allowed to orbit or wobble

F04C2/113

the inner member carrying rollers intermeshing with the outer member

F04C2/12

of other than internal-axis type

F04C2/123

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

F04C2/126

with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type

F04C2/14

with toothed rotary pistons

F04C2/16

with helical teeth, e.g. chevron-shaped, screw type

for non-parallel axes of movement F04C3/00

F04C2/165

having more than two rotary pistons with parallel axes

F04C2/18

with similar tooth forms F04C2/16 takes precedence

F04C2/20

with dissimilar tooth forms F04C2/16 takes precedence

F04C2/22

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

F04C2/24

of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions

F04C2/26

of internal-axis type

F04C2/28

of other than internal-axis type

F04C2/30

having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members

F04C2/32

having both the movement defined in groups F04C2/02 and relative reciprocation between co-operating members

F04C2/321

with vanes hinged to the inner member and reciprocating with respect to the inner member

F04C2/322

with vanes hinged to the outer member and reciprocating with respect to the outer member

F04C2/324

with vanes hinged to the inner member and reciprocating with respect to the outer member

F04C2/328

and hinged to the outer member

F04C2/332

with vanes hinged to the outer member and reciprocating with respect to the inner member

F04C2/336

and hinged to the inner member

F04C2/34

having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members

F04C2/344

with vanes reciprocating with respect to the inner member

F04C2/3441

the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation

F04C2/3442

the surfaces of the inner and outer member, forming the working space, being surfaces of revolution

F04C2/3443

with a separation element located between the inlet and outlet opening

F04C2/3445

the vanes having the form of rollers, slippers or the like

F04C2/3446

the inner and outer member being in contact along more than one line or surface

F04C2/3447

the vanes having the form of rollers, slippers or the like

F04C2/3448

with axially movable vanes

F04C2/348

the vanes positively engaging, with circumferential play, an outer rotatable member

F04C2/352

the vanes being pivoted on the axis of the outer member

F04C2/356

with vanes reciprocating with respect to the outer member

F04C2/3562

the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation

F04C2/3564

the surfaces of the inner and outer member, forming the working space, being surfaces of revolution

F04C2/3566

the inner and outer member being in contact along more than one line or surface

F04C2/3568

with axially movable vanes

F04C2/36

having both the movements defined in groups F04C2/22 and F04C2/24

F04C2/38

having the movement defined in group F04C2/02 and having a hinged member F04C2/32 takes precedence

F04C2/39

with vanes hinged to the inner as well as to the outer member

F04C2/40

having the movement defined in group F04C2/08 or F04C2/22 and having a hinged member

F04C2/44

with vanes hinged to the inner member

F04C2/46

with vanes hinged to the outer member

F04C3/00

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 F04C5/00; rotary-piston pumps with non-parallel axes of movement of co-operating members specially adapted for elastic fluids F04C18/48

F04C3/02

the axes being arranged at an angle of 90 degrees

F04C3/04

of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

F04C3/06

the axes being arranged otherwise than at an angle of 90 degrees

F04C3/08

of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

F04C3/085

the axes of cooperating members being on the same plane

F04C5/00

Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable such pumps specially adapted for elastic fluids F04C18/00

F04C7/00

Rotary-piston machines or pumps with fluid ring or the like such pumps specially adapted for elastic fluids F04C19/00

F04C9/00

Oscillating-piston machines or pumps such pumps specially adapted for elastic fluids F04C21/00

F04C9/002

the piston oscillating around a fixed axis

F04C9/005

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 F04C3/00

F04C9/007

the points of the moving element describing approximately an alternating movement in axial direction with respect to the other element

F04C11/00

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 F04C23/00

Pumping installations F04C13/00 takes precedence; specially adapted for elastic fluids F04C23/00; fluid gearing F16H

Multi-stage engines, motors, pumps or compressors with stages connected in series or in parallel are not considered as having complementary function

F04C11/001

of similar working principle

F04C11/003

having complementary function

F04C11/005

of dissimilar working principle

F04C11/006

having complementary function

F04C11/008

Enclosed motor pump units

F04C13/00

Adaptations of machines or pumps for special use, e.g. for extremely high pressures of pumps specially adapted for elastic fluids F04C25/00

F04C13/001

Pumps for particular liquids

F04C13/002

for homogeneous viscous liquids

F04C13/004

with means for fluidising or diluting the material being pumped

F04C13/005

Removing contaminants, deposits or scale from the pump; Cleaning

F04C13/007

Venting; Gas and vapour separation during pumping preventing vapour lock in fuel pumps F02M37/20, in centrifugal pumps F04D9/00

F04C13/008

Pumps for submersible use, i.e. down-hole pumping

F04C14/00

Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations of pumps or pumping installations specially adapted for elastic fluids F04C28/00

F04C14/02

specially adapted for several machines or pumps connected in series or in parallel

F04C14/04

specially adapted for reversible machines or pumps

F04C14/06

specially adapted for stopping, starting, idling or no-load operation

F04C14/065

Capacity control using a multiplicity of units or pumping capacities, e.g. multiple chambers, individually switchable or controllable

F04C14/08

characterised by varying the rotational speed

F04C14/10

characterised by changing the positions of the inlet or outlet openings with respect to the working chamber

F04C14/12

using sliding valves

F04C14/14

using rotating valves

F04C14/16

using lift valves

F04C14/18

characterised by varying the volume of the working chamber by changing the positions of inlet or outlet openings F04C14/10

F04C14/185

by varying the useful pumping length of the cooperating members in the axial direction

F04C14/20

by changing the form of the inner or outer contour of the working chamber

F04C14/22

by changing the eccentricity between cooperating members

F04C14/223

using a movable cam

F04C14/226

by pivoting the cam around an eccentric axis

F04C14/24

characterised by using valves controlling pressure or flow rate, e.g. discharge valves

or unloading valves

F04C14/10 takes precedence

F04C14/26

using bypass channels

F04C14/265

being obtained by displacing a lateral sealing face

F04C14/28

Safety arrangements

Monitoring

F04C15/00

Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00 of pumps specially adapted for elastic fluids F04C18/00 - F04C29/00

F04C15/0003

Sealing arrangements in rotary-piston machines or pumps sealing in general F16J

F04C15/0007

Radial sealings for working fluid

F04C15/0011

of rigid material

F04C15/0015

of resilient material

F04C15/0019

Radial sealing elements specially adapted for intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

F04C15/0023

Axial sealings for working fluid

F04C15/0026

Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

F04C15/003

Sealings for working fluid between radially and axially moving parts

F04C15/0034

for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine

F04C15/0038

Shaft sealings specially adapted for rotary-piston machines or pumps

F04C15/0042

Systems for the equilibration of forces acting on the machines or pump interstice adjustment other than by fluid pressure F01C21/102

F04C15/0046

Internal leakage control

F04C15/0049

Equalization of pressure pulses silencing for compressors F04C29/06

F04C15/0053

Venting means for starting

F04C15/0057

Driving elements, brakes, couplings, transmission specially adapted for machines or pumps brakes, couplings, transmissions per se F16, B60

F04C15/0061

Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions

F04C15/0065

for eccentric movement

F04C15/0069

Magnetic couplings

F04C15/0073

Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft

F04C15/0076

Fixing rotors on shafts, e.g. by clamping together hub and shaft

F04C15/008

Prime movers

F04C15/0084

Brakes, braking assemblies

F04C15/0088

Lubrication of machines or engines in general F01M

F04C15/0092

Control systems for the circulation of the lubricant

F04C15/0096

Heating; Cooling of machines or engines in general F01P

F04C15/06

Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

F04C15/062

Arrangements for supercharging the working space similar arrangements for internal combustion engines F02B33/00, F02B37/00

F04C15/064

with inlet and outlet valves specially adapted for rotary or oscillating piston machines or pumps

F04C15/066

of the non-return type

F04C15/068

of the elastic type, e.g. reed valves

F04C18/00

Rotary-piston pumps specially adapted for elastic fluids with fluid ring or the like F04C19/00; rotary-piston pumps in which the working-fluid is exclusively displaced by one or more reciprocating pistons F04B

Group F04C18/30 takes precedence over groups F04C18/02 - F04C18/28 and F04C18/48 - F04C18/56.

F04C18/02

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

F04C18/0207

both members having co-operating elements in spiral form

F04C18/0215

where only one member is moving

F04C18/0223

with symmetrical double wraps

F04C18/023

where both members are moving

F04C18/0238

with symmetrical double wraps

F04C18/0246

Details concerning the involute wraps or their base, e.g. geometry

F04C18/0253

Details concerning the base

F04C18/0261

Details of the ports, e.g. location, number, geometry

F04C18/0269

Details concerning the involute wraps

F04C18/0276

Different wall heights

F04C18/0284

Details of the wrap tips

F04C18/0292

Ports or channels located in the wrap

F04C18/04

of internal-axis type

F04C18/045

having a C-shaped piston

F04C18/06

of other than internal-axis type

F04C18/063

with coaxially-mounted members having continuously-changing circumferential spacing between them

F04C18/067

having cam-and-follower type drive

F04C18/07

having crankshaft-and-connecting-rod type drive

F04C18/073

having pawl-and-ratchet type drive

F04C18/077

having toothed-gearing type drive

F04C18/08

of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

F04C18/082

Details specially related to intermeshing engagement type pumps

F04C18/084

Toothed wheels

F04C18/086

Carter

F04C18/088

Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement

F04C18/10

of internal-axis type with the outer member having more teeth or tooth equivalents, e.g. rollers, than the inner member

F04C18/103

with a crescent shaped filler element, located between the inner and outer intermeshing elements

F04C18/107

with helical teeth

F04C18/1075

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

F04C18/113

the inner member carrying rollers intermeshing with the outer member

F04C18/12

of other than internal-axis type

F04C18/123

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

F04C18/126

with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type

F04C18/14

with toothed rotary pistons

F04C18/16

with helical teeth, e.g. chevron-shaped, screw type

for non-parallel axes of movement F04C18/48

F04C18/165

having more than two rotary pistons with parallel axes

F04C18/18

with similar tooth forms F04C18/16 takes precedence

F04C18/20

with dissimilar tooth forms F04C18/16 takes precedence

F04C18/22

F04C18/24

of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions

F04C18/26

of internal-axis type

F04C18/28

of other than internal-axis type

F04C18/30

having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members

F04C18/32

having both the movement defined in group F04C18/02 and relative reciprocation between the co-operating members

F04C18/321

with vanes hinged to the inner member and reciprocating with respect to the inner member

F04C18/322

with vanes hinged to the outer member and reciprocating with respect to the outer member

F04C18/324

with vanes hinged to the inner member and reciprocating with respect to the outer member

F04C18/328

and hinged to the outer member

F04C18/332

with vanes hinged to the outer member and reciprocating with respect to the inner member

F04C18/336

and hinged to the inner member

F04C18/34

having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members

F04C18/344

with vanes reciprocating with respect to the inner member

F04C18/3441

the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation

F04C18/3442

the surfaces of the inner and outer member, forming the inlet and outlet opening

F04C18/3443

with a separation element located between the inlet and outlet opening

F04C18/3445

the vanes having the form of rollers, slippers or the like

F04C18/3446

the inner and outer member being in contact along more than one line or surface

F04C18/3447

the vanes having the form of rollers, slippers or the like

F04C18/3448

with axially movable vanes

F04C18/348

the vanes positively engaging, with circumferential play, an outer rotatable member

F04C18/352

the vanes being pivoted on the axis of the outer member

F04C18/356

with vanes reciprocating with respect to the outer member

F04C18/3562

the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation

F04C18/3564

the surfaces of the inner and outer member, forming the working space, being surfaces of revolution

F04C18/3566

the inner and outer member being in contact along more than line or surface

F04C18/3568

with axially movable vanes

F04C18/36

having both the movements defined in groups F04C18/22 and F04C18/24

F04C18/38

having the movement defined in group F04C18/02 and having a hinged member F04C18/32 takes precedence

F04C18/39

with vanes hinged to the inner as well as to the outer member

F04C18/40

having the movement defined in group F04C18/08 or F04C18/22 and having a hinged member

F04C18/44

with vanes hinged to the inner member

F04C18/46

with vanes hinged to the outer member

F04C18/48

Rotary-piston pumps with non-parallel axes of movement of co-operating members

F04C18/50

the axes being arranged at an angle of 90 degrees

F04C18/52

of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

F04C18/54

the axes being arranged otherwise than at an angle of 90 degrees

F04C18/56

of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

F04C18/565

the axes of cooperating members being on the same plane

F04C19/00

Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids

F04C19/001

General arrangements, plants, flowsheets

F04C19/002

with rotating outer members

F04C19/004

Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply

F04C19/005

Details concerning the admission or discharge

F04C19/007

Port members in the form of side plates

F04C19/008

Port members in the form of conical or cylindrical pieces situated in the centre of the impeller

F04C21/00

Oscillating-piston pumps specially adapted for elastic fluids

F04C21/002

the piston oscillating around a fixed axis

F04C21/005

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 F04C18/48

F04C21/007

the points of the moving element describing approximately an alternating movement in axial direction with respect to the other element

F04C23/00

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 F04C25/00 takes precedence

Multi-stage pumps or compressors with stages connected in series or in parallel are not considered as having complementary function

F04C23/001

of similar working principle

F04C23/003

having complementary function

F04C23/005

of dissimilar working principle

F04C23/006

having complementary function

F04C23/008

Hermetic pumps

Multi-stage steam engines, motors, pumps or compressors with stages connected in series or in parallel are not considered as having complementary function

F04C23/02

Pumps characterised by combination with or adaptation to specific driving engines or motors predominant aspects of the engines or motors, see the relevant classes

F04C25/00

Adaptations of pumps for special use of pumps for elastic fluids

F04C25/02

for producing high vacuum sealing arrangements F04C27/00; silencing F04C29/06

F04C27/00

Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids

F04C27/001

Radial sealings for working fluid

F04C27/002

of rigid material

F04C27/003

of resilient material

F04C27/004

Radial sealing elements specially adapted for intermeshing-engagement type pumps, e.g. gear pumps

F04C27/005

Axial sealings for working fluid

F04C27/006

Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type pumps, e.g. gear pumps

F04C27/007

Sealings for working fluid between radially and axially moving parts

F04C27/008

for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine

F04C27/009

Shaft sealings specially adapted for pumps

F04C27/02

Liquid sealing for high-vacuum pumps

or for compressors

F04C28/00

Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids

F04C28/02

specially adapted for several pumps connected in series or in parallel

F04C28/04

specially adapted for reversible pumps

F04C28/06

specially adapted for stopping, starting, idling or no-load operation

F04C28/065

Capacity control using a multiplicity of units or pumping capacities, e.g. multiple chambers, individually switchable or controllable

F04C28/08

characterised by varying the rotational speed

F04C28/10

characterised by changing the positions of the inlet or outlet openings with respect to the working chamber

F04C28/12

using sliding valves

F04C28/125

with sliding valves controlled by the use of fluid other than the working fluid

F04C28/14

using rotating valves

F04C28/16

using lift valves

F04C28/18

characterised by varying the volume of the working chamber by changing the positions of inlet or outlet openings F04C28/10

F04C28/185

by varying the useful pumping length of the cooperating members in the axial direction

F04C28/20

by changing the form of the inner or outer contour of the working chamber

F04C28/22

by changing the eccentricity between cooperating members

F04C28/24

characterised by using valves controlling pressure or flow rate, e.g. discharge valves

or unloading valves

F04C28/10 takes precedence

F04C28/26

using bypass channels

F04C28/265

being obtained by displacing a lateral sealing face

F04C28/28

Safety arrangements

Monitoring

F04C29/00

Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00

F04C29/0007

Injection of a fluid in the working chamber for sealing, cooling and lubricating sealing only F04C27/00; lubrication only F04C29/02; cooling F02B47/02, F02D21/00, F02M25/00

F04C29/0014

with control systems for the injection of the fluid

F04C29/0021

Systems for the equilibration of forces acting on the pump interstice adjustment other than by fluid pressure F01C21/102

F04C29/0028

Internal leakage control

F04C29/0035

Equalization of pressure pulses silencing F04C29/06

F04C29/0042

Driving elements, brakes, couplings, transmissions specially adapted for pumps brakes, couplings, transmissions per se F16, B60

F04C29/005

Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions

F04C29/0057

for eccentric movement

F04C29/0064

Magnetic couplings

F04C29/0071

Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft

F04C29/0078

Fixing rotors on shafts, e.g. by clamping together hub and shaft

F04C29/0085

Prime movers

F04C29/0092

Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning

F04C29/02

Lubrication of machines or engines in general F01M

Lubricant separation separation in general B01D

F04C29/021

Control systems for the circulation of the lubricant

F04C29/023

Lubricant distribution through a hollow driving shaft F04C29/025 takes precedence

F04C29/025

using a lubricant pump

F04C29/026

Lubricant separation

F04C29/028

Means for improving or restricting lubricant flow

F04C29/04

Heating

Cooling of machines or engines in general F01P

Heat insulation heat insulation in general F16L59/00

F04C29/042

by injecting a fluid injection of fluid for sealing, cooling or lubrication F04C29/0007

F04C29/045

of the electric motor in hermetic pumps

F04C29/047

Cooling of electronic devices installed inside the pump housing, e.g. inverters

F04C29/06

Silencing gas-flow silencers or exhaust apparatus for machines or engines in general F01N

F04C29/061

Silencers using overlapping frequencies, e.g. Helmholtz resonators

F04C29/063

Sound absorbing materials

F04C29/065

Noise dampening volumes, e.g. muffler chambers

F04C29/066

with means to enclose the source of noise

F04C29/068

the silencing means being arranged inside the pump housing

F04C29/12

Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

F04C29/122

Arrangements for supercharging the working space similar arrangements for internal combustion engines F02B33/00, F02B37/00

F04C29/124

with inlet and outlet valves specially adapted for rotary or oscillating piston pumps

F04C29/126

of the non-return type

F04C29/128

of the elastic type, e.g. reed valves

F04C2210/00

Fluid

F04C2210/10

working

F04C2210/1005

Air

F04C2210/1011

Amine

F04C2210/1016

Blood

F04C2210/1022

C₃H_mF_n

F04C2210/1027

CO₂

F04C2210/1033

Concrete

F04C2210/1038

Cooking oil

F04C2210/1044

Fuel

F04C2210/105

Helium (He)

F04C2210/1055

Hydrogen (H₂)

F04C2210/1061

LPG

F04C2210/1066

Nitrogen (N₂)

F04C2210/1072

Oxygen (O₂)

F04C2210/1077

Steam

F04C2210/1083

Urea

F04C2210/1088

Vegetable oil

F04C2210/1094

Water

F04C2210/12

auxiliary

F04C2210/122

Nitrogen (N₂)

F04C2210/124

Sodium (Na)

F04C2210/126

Tin

F04C2210/128

Water

F04C2210/14

Lubricant

F04C2210/142

Ester

F04C2210/145

PAG

F04C2210/147

Water

F04C2210/20

liquid, i.e. incompressible

F04C2210/201

DME

F04C2210/203

Fuel

F04C2210/205

Ink

F04C2210/206

Oil

F04C2210/208

Water

F04C2210/22

gaseous, i.e. compressible

F04C2210/221

Air

F04C2210/222

Carbon dioxide (CO₂)

F04C2210/224

Hydrogen (H₂)

F04C2210/225

Nitrogen (N₂)

F04C2210/227

Steam

F04C2210/228

Vapour

F04C2210/24

mixed, e.g. two-phase fluid

F04C2210/242

Steam

F04C2210/245

Vapour

F04C2210/247

Water

F04C2210/26

Refrigerants with particular properties, e.g. HFC-134a

F04C2210/261

Carbon dioxide (CO₂)

F04C2210/263

HFO1234YF

F04C2210/265

Ammoniac (NH₃)

F04C2210/266

Propane

F04C2210/268

R32

F04C2210/40

Properties

F04C2210/42

magnetic or ferromagnetic

Ferrofluids

F04C2210/44

Viscosity

F04C2210/60

Condition

F04C2210/62

Purity

F04C2220/00

Application

F04C2220/10

Vacuum

F04C2220/12

Dry running

F04C2220/20

Pumps with means for separating and evacuating the gaseous phase

F04C2220/22

for very low temperatures, i.e. cryogenic

F04C2220/24

for metering throughflow

F04C2220/26

for step-by-step output movement

F04C2220/28

for pulsed fluid flow

F04C2220/30

Use in a chemical vapor deposition [CVD] process or in a similar process

F04C2220/40

Pumps with means for venting areas other than the working chamber, e.g. bearings, gear chambers, shaft seals

F04C2220/50

Pumps with means for introducing gas under pressure for ballasting

F04C2230/00

Manufacture

Manufacture comprises also treatment, assembly or disassembly methods, repairing, handling or the like.

F04C2230/10

by removing material

F04C2230/101

by electrochemical methods

F04C2230/102

by spark erosion methods

F04C2230/103

using lasers

F04C2230/20

essentially without removing material

F04C2230/21

by casting

F04C2230/22

by sintering

F04C2230/23

by permanently joining parts together

F04C2230/231

by welding

F04C2230/24

by extrusion

F04C2230/25

by forging

F04C2230/26

by rolling

F04C2230/27

by hydroforming

F04C2230/40

Heat treatment

F04C2230/41

Hardening

Annealing

F04C2230/60

Assembly methods

F04C2230/601

Adjustment

F04C2230/602

Gap

Clearance

F04C2230/603

Centering

Aligning

F04C2230/604

Mounting devices for pumps or compressors

F04C2230/605

Balancing

F04C2230/70

Disassembly methods

F04C2230/80

Repairing methods

F04C2230/85

Methods for improvement by repair or exchange of parts

F04C2230/90

Improving properties of machine parts

F04C2230/91

Coating

F04C2230/92

Surface treatment

F04C2240/00

Components

F04C2240/10

Stators

F04C2240/102

with means for discharging condensate or liquid separated from the gas pumped

F04C2240/20

Rotors

F04C2240/30

Casings or housings

F04C2240/40

Electric motor

F04C2240/401

Linear motor

F04C2240/402

Plurality of electronically synchronised motors

F04C2240/403

with inverter for speed control

F04C2240/45

Hybrid prime mover

F04C2240/50

Bearings

F04C2240/51

for cantilever assemblies

F04C2240/52

for assemblies with supports on both sides

F04C2240/54

Hydrostatic or hydrodynamic bearing assemblies specially adapted for rotary positive displacement pumps or compressors

F04C2240/56

Bearing bushings or details thereof

F04C2240/60

Shafts

F04C2240/601

Shaft flexion

F04C2240/603

with internal channels for fluid distribution, e.g. hollow shaft

F04C2240/605

Shaft sleeves or details thereof

F04C2240/70

Use of multiplicity of similar components

Modular construction

F04C2240/80

Other components

F04C2240/801

Wear plates

F04C2240/802

Liners

F04C2240/803

Electric connectors or cables

Fittings therefor

F04C2240/804

Accumulators for refrigerant circuits

F04C2240/805

Fastening means, e.g. bolts

F04C2240/806

Pipes for fluids

Fittings therefor

F04C2240/807

Balance weight, counterweight

F04C2240/808

Electronic circuits (e.g. inverters) installed inside the machine

F04C2240/809

Lubricant sump

F04C2240/81

Sensor, e.g. electronic sensor for control or monitoring

F04C2240/811

Actuator for control, e.g. pneumatic, hydraulic, electric

F04C2250/00

Geometry

F04C2250/10

of the inlet or outlet

F04C2250/101

of the inlet

F04C2250/102

of the outlet

F04C2250/20

of the rotor

F04C2250/201

conical shape

F04C2250/30

of the stator

F04C2250/301

compression chamber profile defined by a mathematical expression or by parameters

F04C2270/00

Control

Monitoring or safety arrangements

F04C2270/01

Load

F04C2270/015

Controlled or regulated

F04C2270/02

Power

F04C2270/025

Controlled or regulated

F04C2270/03

Torque

F04C2270/035

Controlled or regulated

F04C2270/04

Force

F04C2270/041

Controlled or regulated

F04C2270/042

radial

F04C2270/0421

Controlled or regulated

F04C2270/0422

centrifugal

F04C2270/04225

Controlled or regulated

F04C2270/044

axial

F04C2270/0445

Controlled or regulated

F04C2270/05

Speed

F04C2270/051

Controlled or regulated

F04C2270/052

angular

F04C2270/0525

Controlled or regulated

F04C2270/054

linear

F04C2270/0545

Controlled or regulated

F04C2270/06

Acceleration

F04C2270/065

Controlled or regulated

F04C2270/07

Electric current

F04C2270/075

Controlled or regulated

F04C2270/08

Amplitude of electric current

F04C2270/085

Controlled or regulated

F04C2270/09

Electric current frequency

F04C2270/095

Controlled or regulated

F04C2270/10

Voltage

F04C2270/105

Controlled or regulated

F04C2270/11

Magnetic flux

F04C2270/115

Controlled or regulated

F04C2270/12

Vibration

F04C2270/125

Controlled or regulated

F04C2270/13

Noise

F04C2270/135

Controlled or regulated

F04C2270/14

Pulsations

F04C2270/145

Controlled or regulated

F04C2270/15

Resonance

F04C2270/155

Controlled or regulated

F04C2270/16

Wear

F04C2270/165

Controlled or regulated

F04C2270/17

Tolerance

Play

Gap

F04C2270/175

Controlled or regulated

F04C2270/18

Pressure

F04C2270/185

Controlled or regulated

F04C2270/19

Temperature

F04C2270/195

Controlled or regulated

F04C2270/20

Flow

F04C2270/205

Controlled or regulated

F04C2270/21

Pressure difference

F04C2270/215

Controlled or regulated

F04C2270/22

Temperature difference

F04C2270/225

Controlled or regulated

F04C2270/23

Working cycle timing control

F04C2270/24

Level of liquid, e.g. lubricant or cooling liquid

F04C2270/40

Conditions across a pump or machine

F04C2270/42

Conditions at the inlet of a pump or machine

F04C2270/44

Conditions at the outlet of a pump or machine

F04C2270/46

Conditions in the working chamber

F04C2270/48

Conditions of a reservoir linked to a pump or machine

F04C2270/50

Conditions before a throttle

F04C2270/52

Conditions after a throttle

F04C2270/54

Conditions in a control cylinder/piston unit

F04C2270/56

Number of pump/machine units in operation

F04C2270/58

Valve parameters

F04C2270/585

Controlled or regulated

F04C2270/60

Prime mover parameters

F04C2270/605

Controlled or regulated

F04C2270/70

Safety, emergency conditions or requirements

F04C2270/701

Cold start

F04C2270/72

preventing reverse rotation

F04C2270/78

Warnings

F04C2270/782

Sound

F04C2270/784

Light

F04C2270/80

Diagnostics

F04C2270/86

Detection

F04C2270/90

Remote control, e.g. wireless, via LAN, by radio, or by a wired connection from a central computer

F04C2280/00

Arrangements for preventing or removing deposits or corrosion

F04C2280/02

Preventing solid deposits in pumps, e.g. in vacuum pumps with chemical vapour deposition [CVD] processes

F04C2280/04

Preventing corrosion