WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

F04D　NON-POSITIVE DISPLACEMENT PUMPS

F04D 1/00 Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps (adapted for pumping specific fluids F04D 7/00; priming or boosting F04D 9/00)

F04D 1/003 ・{Having contrarotating parts}

F04D 1/006 ・{double suction pumps}

F04D 1/02 ・having non-centrifugal stages, e.g. centripetal

F04D 1/025 ・・{Comprising axial and raidal stages}

F04D 1/04 ・Helico-centrifugal pumps

F04D 1/06 ・Multi-stage pumps (F04D 1/02, F04D 13/10 take precedence)

F04D 1/063 ・・{of the vertically split casing type}

F04D 1/066 ・・・{the casing consisting of a plurality of annuli bolted together}

F04D 1/08 ・・the stages being situated concentrically

F04D 1/10 ・・with means for changing the flow-path through the stages, e.g. series-parallel, e.g. side loads

F04D 1/12 ・Pumps with scoops or like paring members protruding in the fluid circulating in a bowl

F04D 1/14 ・Pumps raising fluids by centrifugal force within a conical rotary bowl with vertical axis

F04D 3/00 Axial-flow pumps (priming or boosting F04D 9/00)

F04D 3/005 ・{with a conventional single stage rotor}

F04D 3/02 ・of screw type

F04D 5/00 Pumps with circumferential or transverse flow {(control thereof F04D 15/005)}

F04D 5/001 ・{Shear force pumps}

F04D 5/002 ・{Regenerative pumps (for elastic fluids F04D 23/008)}

F04D 5/003 ・・{of multistage type}

F04D 5/005 ・・・{the stages being radially offset}

F04D 5/006 ・・・{the stages being axially offset}

F04D 5/007 ・・{Details of the inlet or outlet}

F04D 5/008 ・・{Details of the stator, e.g. channel shape}

F04D 7/00 Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts (F04D 11/005, F04D 29/22 take precedence)

F04D 7/02 ・of centrifugal type

F04D 7/04 ・・the fluids being viscous or non-homogenous

F04D 7/045 ・・・{with means for comminuting, mixing stirring or otherwise treating}

F04D 7/06 ・・the fluids being hot or corrosive, e.g. liquid metals

F04D 7/065 ・・・{for liquid metal}

F04D 7/08 ・・the fluids being radioactive

F04D 9/00 Priming; Preventing vapour lock

F04D 9/001 ・{Preventing vapour lock (F04D 9/041 takes precedence)}

F04D 9/002 ・・{by means in the very pump (F04D 9/041 takes precedence)}

F04D 9/003 ・・・{separating and removing the vapour}

F04D 9/004 ・{Priming of not self-priming pumps}

F04D 9/005 ・・{by adducting or recycling liquid (F04D 9/006 takes precedence)}

F04D 9/006 ・・{by venting gas or using gas valves}

F04D 9/007 ・{Preventing loss of prime, siphon breakers (stopping of pumps F04D 15/02)}

F04D 9/008 ・・{by means in the suction mouth, e.g. foot valves}

F04D 9/02 ・Self-priming pumps

F04D 9/04 ・Using priming pumps; Using booster pumps to prevent vapour-lock

F04D 9/041 ・・{the priming pump having evacuating action (F04D 9/043 and F04D 9/06 take precedence)}

F04D 9/042 ・・・{and means for rendering its in operative}

F04D 9/043 ・・{the priming pump being hand operated or of the reciprocating type}

F04D 9/044 ・・{Means for rendering the priming pump inoperative}

F04D 9/045 ・・・{the means being liquid level sensors}

F04D 9/046 ・・・・{the means being floats}

F04D 9/047 ・・・{the means being flow sensors}

F04D 9/048 ・・・{the means being outlet pressure sensors}

F04D 9/049 ・・・{by operator interventions}

F04D 9/06 ・・of jet type

F04D 9/065 ・・・{the driving fluid being a gas or vapour, e.g. exhaust of a combustion engine}

F04D 11/00 Other rotary non-positive-displacement pumps (pumping installations or systems F04D 13/00)

F04D 11/005 ・{Swash-type impeller pumps}

F04D 13/00 Pumping installations or systems (controlling F04D 15/00)

F04D 13/02 ・Units comprising pumps and their driving means (predominant aspects of the driving means, see the relevant classes for such means)

F04D 13/021 ・・{containing a coupling}

F04D 13/022 ・・・{a coupling allowing slip, e.g. torque converter}

F04D 13/023 ・・・・{for reducing start torque}

F04D 13/024 ・・・{a magnetic coupling}

F04D 13/025 ・・・・{Details of the can separating the pump and drive area}

F04D 13/026 ・・・・{Details of the bearings}

F04D 13/027 ・・・・{Details of the magnetic circuit}

F04D 13/028 ・・{the driving means being a planetary gear}

F04D 13/04 ・・the pump being fluid driven

F04D 13/043 ・・・{the pump wheel carrying the fluid driving means}

F04D 13/046 ・・・{the fluid driving means being a hydraulic motor of the positive displacement type}

F04D 13/06 ・・the pump being electrically driven

F04D 13/0606 ・・・{Canned motor pumps}

F04D 13/0613 ・・・・{Special connection between the rotor compartments}

F04D 13/062 ・・・・{pressure compensation between motor- and pump- compartment}

F04D 13/0626 ・・・・{Details of the can}

F04D 13/0633 ・・・・{Details of the bearings}

F04D 13/064 ・・・・{Details of the magnetic circuit}

F04D 13/0646 ・・・{the hollow pump or motor shaft being the conduit for the working fluid}

F04D 13/0653 ・・・{the motor being flooded}

F04D 13/066 ・・・{Floating-units}

F04D 13/0666 ・・・{the motor being of the plane gap type}

F04D 13/0673 ・・・{the motor being of the inside-out type}

F04D 13/068 ・・・{Battery powered}

F04D 13/0686 ・・・{Mechanical details of the pump control unit (pump control F04D 15/00)}

F04D 13/0693 ・・・{Details or arrangements of the wiring}

F04D 13/08 ・・・for submerged use

F04D 13/083 ・・・・{and protected by a gas-bell}

F04D 13/086 ・・・・{the pump and drive motor are both submerged}

F04D 13/10 ・・・・adapted for use in mining bore holes

F04D 13/12 ・Combinations of two or more pumps (combinations with priming pumps or booster pumps to counteract vapour-lock F04D 9/04)

F04D 13/14 ・・the pumps being all of centrifugal type {(deviation valves F04D 15/0016)}

F04D 13/16 ・with storage reservoirs

F04D 15/00 Control, e.g. regulation, of pumps, pumping installations or systems

F04D 15/0005 ・{by using valves}

F04D 15/0011 ・・{by-pass valves}

F04D 15/0016 ・・{mixing-reversing- or deviation valves}

F04D 15/0022 ・・{throttling valves or valves varying the pump inlet opening or the outlet opening}

F04D 15/0027 ・{Varying behaviour or the very pump (F04D 15/0055 and F04D 29/46 take precedence)}

F04D 15/0033 ・・{By-passing by increasing clearance between impeller and its casing}

F04D 15/0038 ・・{by varying the effective cross-sectional area of flow through the rotor}

F04D 15/0044 ・・{by introducing a gas}

F04D 15/005 ・・{the pumps being of the circumferential flow type}

F04D 15/0055 ・{Rotors with adjustable blades}

F04D 15/0061 ・・{responsive to temperature}

F04D 15/0066 ・{by changing the speed, e.g. of the driving engine}

F04D 15/0072 ・{Installation or systems with two or more pumps, wherein the flow path through the stages can be changed, e.g. series-parallel}

F04D 15/0077 ・{Safety measures (F04D 15/02 takes precedence)}

F04D 15/0083 ・・{Protection against sudden pressure change, e.g. check valves}

F04D 15/0088 ・{Testing machines}

F04D 15/0094 ・{Indicators of rotational movement}

F04D 15/02 ・Stopping of pumps, or operating valves, on occurrence of unwanted conditions

F04D 15/0209 ・・{responsive to a condition of the working fluid (F04D 15/029 takes precedence)}

F04D 15/0218 ・・・{the condition being a liquid level or a lack of liquid supply}

F04D 15/0227 ・・・・{Lack of liquid level being detected using a flow transducer}

F04D 15/0236 ・・・・{Lack of liquid level being detected by analysing the parameters of the electric drive, e.g. current or power consumption}

F04D 15/0245 ・・{responsive to a condition of the pump}

F04D 15/0254 ・・・{the condition being speed or load}

F04D 15/0263 ・・・{the condition being temperature, ingress of humidity or leakage}

F04D 15/0272 ・・・{the condition being wear or a position}

F04D 15/0281 ・・{responsive to a condition not otherwise provided for}

F04D 15/029 ・・{for pumps operating in parallel}

F04D 17/00 Radial-flow pumps e.g. centrifugal pumps; Helico-centrifugal pumps (F04D 21/00 takes precedence)

F04D 17/02 ・having non-centrifugal stages, e.g. centripetal

F04D 17/025 ・・{comprising axial flow and radial flow stages}

F04D 17/04 ・・of transverse-flow type

F04D 17/06 ・Helico-centrifugal pumps

F04D 17/08 ・Centrifugal pumps

F04D 17/10 ・・for compressing or evacuating

F04D 17/105 ・・・{with double suction}

F04D 17/12 ・・・Multi-stage pumps

F04D 17/122 ・・・・{the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors}

F04D 17/125 ・・・・・{the casing being vertically split}

F04D 17/127 ・・・・{with radially spaced stages, e.g. for contrarotating type}

F04D 17/14 ・・・・with means for changing the flow-path through the stages, e.g. series-parallel, e.g. side-loads, (surge control F04D 27/02)

F04D 17/16 ・・for displacing without appreciable compression

F04D 17/161 ・・・{Shear force pumps}

F04D 17/162 ・・・{Double suction pumps}

F04D 17/164 ・・・{Multi-stage fans, e.g. for vacuum cleaners}

F04D 17/165 ・・・{Axial entry and discharge}

F04D 17/167 ・・・{Operating by means of fibrous or porous elements (suction filters F04D 29/701); e.g. with sponge rotors}

F04D 17/168 ・・・{Pumps specially adapted to produce a vacuum}

F04D 17/18 ・・characterised by use of centrifugal force of liquids entrained in pumps {e.g. by means of an auxiliary liquid; fluid ring compressors F04C 19/00}

F04D 19/00 Axial-flow pumps (F04D 21/00 takes precedence); {pump comprising axial flow and radial flow stages F04D 17/025}

F04D 19/002 ・{Axial flow fans}

F04D 19/005 ・・{reversible fans}

F04D 19/007 ・{multistage fans}

F04D 19/02 ・Multi-stage pumps

F04D 19/022 ・・{with concentric rows of vanes;}

F04D 19/024 ・・{with contrarotating parts}

F04D 19/026 ・・{with a plurality of shafts rotating at different speeds (F04D 19/022 takes precedence)}

F04D 19/028 ・・{Layout of fluid flow through the stages}

F04D 19/04 ・・specially adapted to the production of a high vacuum, e.g. molecular pumps

F04D 19/042 ・・・{Turbomolecular vacuum pumps}

F04D 19/044 ・・・{Holweck-type pumps}

F04D 19/046 ・・・{Combinations of two or more different types of pumps}

F04D 19/048 ・・・{comprising magnetic bearings}

F04D 21/00 Pump involving supersonic speed of pumped fluids

F04D 23/00 Other rotary non-positive-displacement pumps (pumping installations or systems F04D 25/00)

F04D 23/001 ・{Pumps adapted for conveying materials or for handling specific elastic fluids}

F04D 23/003 ・・{of radial-flow type}

F04D 23/005 ・・{of axial-flow type}

F04D 23/006 ・{Creating a pulsating flow}

F04D 23/008 ・{Regenerative pumps (for liquids or for liquids and elastic fluids 5/00R)}

F04D 25/00 Pumping installations or systems (controlling F04D 27/00)

F04D 25/02 ・Units comprising pumps and their driving means (predominant aspect of the driving means, see the relevant classes for such means)

F04D 25/022 ・・{comprising a yielding coupling, e.g. hydraulic (a magnetic coupling 25/02D)}

F04D 25/024 ・・{the driving means being assisted by a power recovery turbine}

F04D 25/026 ・・{with a magnetic coupling}

F04D 25/028 ・・{the driving means being a planetary gear}

F04D 25/04 ・・the pump being fluid-driven {(pumps driven by exhaust gases F02B 37/00, F02B 39/00; turbochargers F02C 6/12)}

F04D 25/045 ・・・{the pump wheel carrying the fluid driving means, e.g. turbine blades}

F04D 25/06 ・・the pump being electrically driven (F04D 25/08 takes precedence)

F04D 25/0606 ・・・{the electric motor being specially adapted for integration in the pump}

F04D 25/0613 ・・・・{the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator}

F04D 25/062 ・・・・・{Details of the bearings}

F04D 25/0626 ・・・・・{Details of the lubrication}

F04D 25/0633 ・・・・・{Details of the magnetic circuit}

F04D 25/064 ・・・・・{Details of the rotor}

F04D 25/0646 ・・・・・{Details of the stator}

F04D 25/0653 ・・・・{the motor having a plane air gap, e.g. disc-type}

F04D 25/066 ・・・・{Linear Motors}

F04D 25/0666 ・・・・{a sensor is integrated into the pump/motor design}

F04D 25/0673 ・・・{Battery powered}

F04D 25/068 ・・・{Mechanical details of the pump control unit (pump control details F04D27)}

F04D 25/0686 ・・・{specially adapted for submerged use}

F04D 25/0693 ・・・{Details or arrangements of the wiring}

F04D 25/08 ・・the working fluid being air, e.g. for ventilation

F04D 25/082 ・・・{the unit having provision for cooling the motor}

F04D 25/084 ・・・{hand fans}

F04D 25/086 ・・・・{hand operated}

F04D 25/088 ・・・{Ceiling fans}

F04D 25/10 ・・・the unit having provisions for automatically changing direction of output air

F04D 25/105 ・・・・{by changing rotor axis direction, e.g. oscillating fans (interconnecting rotary motion and oscillating motion F16H)}

F04D 25/12 ・・・the unit being adapted for mounting in apertures

F04D 25/14 ・・・・and having shutters, e.g. automatically closed when not in use

F04D 25/16 ・Combinations of two or more pumps {Producing two or more separate gas flows}

F04D 25/163 ・・{driven by a common gearing arrangement}

F04D 25/166 ・・{using fans}

F04D 27/00 Control, e.g. regulation, of pumps, pumping installations or systems

F04D 27/001 ・{Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring}

F04D 27/002 ・{by varying geometry within the pumps, e.g. by adjusting vanes}

F04D 27/003 ・{by throttling (F04D 27/002 takes precedence)}

F04D 27/004 ・{by varying driving speed}

F04D 27/005 ・{by changing flow path between different stages or between a plurality of compressors; Load distribution between compressors}

F04D 27/006 ・{by influencing fluid temperatures}

F04D 27/007 ・{Conjoint control of two or more different functions}

F04D 27/008 ・{Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves}

F04D 27/009 ・{by bleeding, by passing or recycling fluid}

F04D 27/02 ・Surge control {(surge detection F04D 27/001)}

F04D 27/0207 ・・{by bleeding, bypassing or recycling fluids}(influencing the boundary layer by an uncontrolled bleeding of the working fluid F04D 29/681)

F04D 27/0215 ・・・{Arrangements therefor, e.g. bleed or by-pass valves}

F04D 27/0223 ・・・{Control schemes therefor}

F04D 27/023 ・・・{Details or means for fluid extraction}

F04D 27/0238 ・・・{Details or means for fluid reinjection}

F04D 27/0246 ・・{by varying geometry within the pumps, e.g. by adjusting vanes}

F04D 27/0253 ・・{by throttling (F04D 27/0246 takes precedence)}

F04D 27/0261 ・・{by varying driving speed}

F04D 27/0269 ・・{by changing flow path between different stages or between a plurality of compressors; load distribution between compressors}

F04D 27/0276 ・・{by influencing fluid temperature}

F04D 27/0284 ・・{Conjoint control of two or more different functions}

F04D 27/0292 ・・{Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves}

F04D 29/00 Details, component parts, or accessories (machine elements in general F16)

F04D 29/002 ・{especially adapted for elastic fluid pumps}

F04D 29/005 ・{Decorative aspects, i.e. features which have no effect on the functioning of the pump}

F04D 29/007 ・{especially adapted for liquid pumps}

F04D 29/02 ・Selection of particular materials (for handling specific liquids F04D 7/00{F04D 23/001})

F04D 29/023 ・・{especially adapted for elastic fluid pumps}

F04D 29/026 ・・{especially adapted for liquid pumps}

F04D 29/04 ・Shafts or bearings, or assemblies thereof (specially adapted for elastic fluid pumps F04D 29/05)

F04D 29/0405 ・・{joining shafts, e.g. rigid couplings, quill shafts}{WARNING: The group F04D 29/0405 is no longer used for the classification of new documents as from

F04D 29/041 ・・Axial thrust balancing

F04D 29/0413 ・・・{hydrostatic; hydrodynamic thrust bearings}

F04D 29/0416 ・・・{balancing pistons}

F04D 29/042 ・・Axially shiftable rotors F04D 29/041 takes precedence {control by creating a by-pass F04D 15/0027}

F04D 29/043 ・・Shafts

F04D 29/044 ・・・Arrangements for joining or assembling shafts

F04D 29/046 ・・Bearings

F04D 29/0462 ・・・{Bearing cartridges}

F04D 29/0465 ・・・{Ceramic bearing designs}

F04D 29/0467 ・・・{Spherical bearings}

F04D 29/047 ・・・hydrostatic; hydrodynamic

F04D 29/0473 ・・・・{for radial pumps}

F04D 29/0476 ・・・・{for axial pumps}

F04D 29/048 ・・・magnetic; electromagnetic

F04D 29/049 ・・・Roller bearings

F04D 29/05 ・Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps

F04D 29/051 ・・Axial thrust balancing

F04D 29/0513 ・・・{hydrostatic; hydrodynamic thrust bearings}

F04D 29/0516 ・・・{balancing pistons}

F04D 29/052 ・・Axially shiftable rotors F04D 29/051 takes precedence {control by creating a by-pass F04D 27/0246}

F04D 29/053 ・・Shafts

F04D 29/054 ・・・Arrangements for joining or assembling shafts

F04D 29/056 ・・Bearings

F04D 29/0563 ・・・{Bearings cartridges}

F04D 29/0566 ・・・{Ceramic bearing designs}

F04D 29/057 ・・・hydrostatic; hydrodynamic

F04D 29/058 ・・・magnetic; electromagnetic

F04D 29/059 ・・・Roller bearings

F04D 29/06 ・Lubrication {(F04D 13/0606, F04D 13/0646, F04D 13/0653 take precedence)}

F04D 29/061 ・・{especially adapted for liquid pumps}

F04D 29/063 ・・especially adapted for elastic fluid pumps

F04D 29/08 ・Sealings

F04D 29/083 ・・{especially adapted for elastic fluid pumps}

F04D 29/086 ・・{especially adapted for liquid pumps}

F04D 29/10 ・・Shaft sealings

F04D 29/102 ・・・{especially adapted for elastic fluid pumps}

F04D 29/104 ・・・・{the sealing fluid being other than the working fluid or being the working fluid treated}

F04D 29/106 ・・・{especially adapted for liquid pumps}

F04D 29/108 ・・・・{the sealing fluid being other than the working liquid or being the working liquid treated}

F04D 29/12 ・・・using sealing-rings

F04D 29/122 ・・・・{especially adapted for elastic fluid pumps}

F04D 29/124 ・・・・・{with special means for adducting cooling or sealing fluid}

F04D 29/126 ・・・・{especially adapted for liquid pumps}

F04D 29/128 ・・・・・{with special means for adducting cooling or sealing fluid}

F04D 29/14 ・・・operative only when pump is inoperative

F04D 29/143 ・・・・{especially adapted for elastic fluid pumps}

F04D 29/146 ・・・・{especially adapted for liquid pumps}

F04D 29/16 ・・between pressure and suction sides

F04D 29/161 ・・・{especially adapted for elastic fluid pumps}

F04D 29/162 ・・・・{of a centrifugal flow wheel}

F04D 29/164 ・・・・{of an axial flow wheel}

F04D 29/165 ・・・{especially adapted for liquid pumps}

F04D 29/167 ・・・・{of a centrifugal flow wheel}

F04D 29/168 ・・・・{of an axial flow wheel}

F04D 29/18 ・Rotors (specially for elastic fluids F04D 29/26)

F04D 29/181 ・・{Axial flow rotors (F04D 29/185 take precedence)}

F04D 29/183 ・・・{Semi axial flow rotors}

F04D 29/185 ・・{Rotors consisting of a plurality of wheels}

F04D 29/186 ・・{Shaftless rotors (F04D 13/024 takes precedence)}

F04D 29/188 ・・{specially for regenerative pumps}

F04D 29/20 ・・Mounting rotors on shafts

F04D 29/22 ・・specially for centrifugal pumps

F04D 29/2205 ・・・{Conventional flow pattern (F04D 29/18 takes precedence)}

F04D 29/2211 ・・・・{More than one set of flow passages}

F04D 29/2216 ・・・・{Shape, geometry (F04D 29/2211 takes precedence)}

F04D 29/2222 ・・・・{Construction and assembly (F04D 29/2211 takes precedence)}

F04D 29/2227 ・・・・・{for special materials}

F04D 29/2233 ・・・・・{entirely open or stamped from one sheet}

F04D 29/2238 ・・・{Special flow patterns (F04D 11/005 takes precedence)}

F04D 29/2244 ・・・・{Free vortex}

F04D 29/225 ・・・・{Channel wheels, e.g. one blade or one flow channel}

F04D 29/2255 ・・・・{flow-channels with a special cross-section contour, e.g. ejecting, throttling or diffusing effect}

F04D 29/2261 ・・・{with special measures}

F04D 29/2266 ・・・・{for sealing or thrust balance (F04D 29/04 and F04D 29/16 take precedence)}

F04D 29/2272 ・・・・{for influencing flow or boundary layer}

F04D 29/2277 ・・・・{for increasing NPSH or dealing with liquids near boiling-point}

F04D 29/2283 ・・・・{for reverse pumping action}

F04D 29/2288 ・・・・{for comminuting, mixing or separating}

F04D 29/2294 ・・・・{for protection, e.g. against abrasion}

F04D 29/24 ・・・Vanes

F04D 29/242 ・・・・{Geometry, shape}

F04D 29/245 ・・・・・{for special effects}

F04D 29/247 ・・・・{elastic or self-adjusting}

F04D 29/26 ・Rotors specially for elastic fluids

F04D 29/263 ・・{mounting fan or blower rotors on shafts}

F04D 29/266 ・・{mounting compressor rotors on shafts}

F04D 29/28 ・・for centrifugal or helico-centrifugal pumps {for radial-flow or helico-centrifugal pumps}

F04D 29/281 ・・・{for fans or blowers}

F04D 29/282 ・・・・{the leading edge of each vane being substantially parallel to the rotation axis}

F04D 29/283 ・・・・・{rotors of the squirrel-cage type}

F04D 29/284 ・・・{for compressors}

F04D 29/285 ・・・・{the compressor wheel comprising a pair of rotatable bladed hub portions axially aligned and clamped together}

F04D 29/286 ・・・・{multi-stage rotors}

F04D 29/287 ・・・{with adjusting means}

F04D 29/288 ・・・{Part of the wheel having an ejecting effect e.g. being bladeless diffuser}

F04D 29/289 ・・・{having provision against erosion or for dust-separation}

F04D 29/30 ・・・Vanes

F04D 29/305 ・・・・{Flexible vanes}

F04D 29/32 ・・for axial flow pumps {multistage rotors F01D 5/00}

F04D 29/321 ・・・{for axial flow compressors}

F04D 29/322 ・・・・{blade mountings (F01D 5/30 takes precedence)}

F04D 29/323 ・・・・・{adjustable}

F04D 29/324 ・・・・{blades (F01D 5/282 takes precedence)}

F04D 29/325 ・・・{for axial flow fans (blade mountings F04D 29/34, blades F04D 29/38)}

F04D 29/326 ・・・・{comprising a rotating shroud}

F04D 29/327 ・・・・{with non identical blades}

F04D 29/328 ・・・・{with unequal distribution of blades around the hub}

F04D 29/329 ・・・・{Details of the hub}

F04D 29/34 ・・・Blade mountings {for axial flow compressors F04D 29/322}

F04D 29/36 ・・・・adjustable {flexible blades F04D 29/382}

F04D 29/362 ・・・・・{during rotation}

F04D 29/364 ・・・・・・{The blades having only a predetermined number of possible positions}

F04D 29/366 ・・・・・・{Adjustment by interaction of inertion and lift}

F04D 29/368 ・・・・・・{Adjustment by differences of temperature}

F04D 29/38 ・・・Blades {(for axial flow compressors F04D 29/324)}

F04D 29/382 ・・・・{Flexible blades}

F04D 29/384 ・・・・{characterised by form}

F04D 29/386 ・・・・・{Skewed blades}

F04D 29/388 ・・・・{characterised by construction}

F04D 29/40 ・Casings; Connections of working fluid {bleed or by-pass valves F04D 15/0011, F04D 27/0215}

F04D 29/403 ・・{especially adapted for elastic fluid pumps}

F04D 29/406 ・・{especially adapted for liquid pumps}

F04D 29/42 ・・for radial or helico-centrifugal pumps

F04D 29/4206 ・・・{especially adapted for elastic fluid pumps}

F04D 29/4213 ・・・・{suction ports}

F04D 29/422 ・・・・{Discharge tongues (F04D 17/04 takes precedence)}

F04D 29/4226 ・・・・{Fan casings}

F04D 29/4233 ・・・・・{with volutes extending mainly in axial or radially inward direction}

F04D 29/424 ・・・・・{Double entry casings}

F04D 29/4246 ・・・・・{comprising more than one outlet}

F04D 29/4253 ・・・・・{with axial entry and discharge}

F04D 29/426 ・・・{especially adapted for liquid pumps}

F04D 29/4266 ・・・・{made of sheet metal}

F04D 29/4273 ・・・・{suction eyes}

F04D 29/428 ・・・・{Discharge tongues (F04D 17/04 takes precedence)}

F04D 29/4286 ・・・・{inside lining e.g. rubber}

F04D 29/4293 ・・・・{Details of fluid inlet or outlet}

F04D 29/44 ・・・Fluid-guiding means, e.g. diffusers

F04D 29/441 ・・・・{especially adapted for elastic fluid pumps}

F04D 29/442 ・・・・・{rotating diffusers}

F04D 29/444 ・・・・・{Bladed diffusers}

F04D 29/445 ・・・・{especially adapted for liquid pumps}

F04D 29/447 ・・・・・{rotating diffusers}

F04D 29/448 ・・・・・{bladed diffusers}

F04D 29/46 ・・・・adjustable

F04D 29/462 ・・・・・{especially adapted for elastic fluid pumps}

F04D 29/464 ・・・・・・{adjusting flow cross-section, otherwise than by using adjustable stator blades}

F04D 29/466 ・・・・・{especially adapted for liquid fluid pumps}

F04D 29/468 ・・・・・・{adjusting flow cross-section, otherwise than by using adjustable stator blades}

F04D 29/48 ・・・・・for unidirectional fluid flow in reversible pumps {rotors for reverse action F04D 29/2283}

F04D 29/483 ・・・・・・{especially adapted for elastic fluid pumps}

F04D 29/486 ・・・・・・{especially adapted for liquid pumps}

F04D 29/50 ・・・・・for reversing fluid flow {rotors for reverse action F04D 29/2283}

F04D 29/503 ・・・・・・{especially adapted for elastic fluid pumps}

F04D 29/506 ・・・・・・{especially adapted for liquid pumps}

F04D 29/52 ・・for axial pumps

F04D 29/522 ・・・{especially adapted for elastic fluid pumps}

F04D 29/524 ・・・・{shiftable members for obturating part of the flow path}

F04D 29/526 ・・・・{Details of the casing section radially opposing blade tips (ducts F04D 29/545)}

F04D 29/528 ・・・{especially adapted for liquid pumps}

F04D 29/54 ・・・Fluid-guiding means, e.g. diffusers

F04D 29/541 ・・・・{Specially adapted for elastic fluid pumps (F04D 29/56 takes precedence)}

F04D 29/542 ・・・・・{Bladed diffusers (fixing blades to stators F01D 9/042)}

F04D 29/544 ・・・・・・{Blade shapes}

F04D 29/545 ・・・・・{Ducts}

F04D 29/547 ・・・・・・{having a special shape in order to influence fluid flow}

F04D 29/548 ・・・・{Specially adapted for liquid pumps (F04D 29/56 takes precedence)}

F04D 29/56 ・・・・adjustable

F04D 29/563 ・・・・・{specially adapted for elastic fluid pumps}

F04D 29/566 ・・・・・{specially adapted for liquid pumps}

F04D 29/58 ・Cooling (of machines or engines in general F01P); Heating; Diminishing heat transfer {for the motor of air-pump units F04D 25/082; cooling of shafts or bearings F04D 29/04}

F04D 29/5806 ・・{Cooling the drive system}

F04D 29/5813 ・・{Cooling the control unit}

F04D 29/582 ・・{specially adapted for elastic fluid pumps}

F04D 29/5826 ・・・{Cooling at least part of the working fluid in a heat exchanger}

F04D 29/5833 ・・・・{flow schemes and regulation thereto}

F04D 29/584 ・・・{cooling or heating the machine (F04D 29/5846, F04D 29/5853 take precedence)}

F04D 29/5846 ・・・{cooling by injection}

F04D 29/5853 ・・・{heat insulation or conduction}

F04D 29/586 ・・{specially adapted for liquid pumps}

F04D 29/5866 ・・・{Cooling at last part of the working fluid in a heat exchanger}

F04D 29/5873 ・・・・{flow schemes and regulation thereto}

F04D 29/588 ・・・{cooling or heating the machine (F04D 29/5886, F04D 29/5893 take precedence)}

F04D 29/5886 ・・・{cooling by injection}

F04D 29/5893 ・・・{heat insulation or conduction}

F04D 29/60 ・Mounting; Assembling; Disassembling {F04D 13/10 takes precedence}

F04D 29/601 ・・{specially adapted for elastic fluid pumps}

F04D 29/602 ・・・{Mounting in cavities}

F04D 29/603 ・・・・{means for positioning from outside}

F04D 29/604 ・・・・{means for removing without depressurising the cavity}

F04D 29/605 ・・{specially adapted for liquid pumps}

F04D 29/606 ・・・{Mounting in cavities}

F04D 29/607 ・・・・{means for positioning from outside}

F04D 29/608 ・・・・{means for removing without depressurizing the cavity}

F04D 29/62 ・・of radial or helico-centrifugal pumps

F04D 29/622 ・・・{Adjusting the clearances between rotary and stationary parts}

F04D 29/624 ・・・{especially adapted for elastic fluid pumps}

F04D 29/626 ・・・・{Mounting or removal of fans}

F04D 29/628 ・・・{especially adapted for liquid pumps}

F04D 29/64 ・・of axial pumps

F04D 29/642 ・・・{by adjusting the clearances between rotary and stationary parts}

F04D 29/644 ・・・{especially adapted for elastic fluid pumps}

F04D 29/646 ・・・・{Mounting or removal of fans}

F04D 29/648 ・・・{especially adapted for liquid pumps}

F04D 29/66 ・Combating cavitation, whirls, noise, vibration or the like (gas-flow silencers for machines or engines in general F01N); Balancing (surge control F04D 27/02)

F04D 29/661 ・・{especially adapted for elastic fluid pumps}

F04D 29/662 ・・・{Balancing of rotors (compensating unbalance G01M 1/36)}

F04D 29/663 ・・・{Sound attenuation}

F04D 29/664 ・・・・{by means of sound absorbing material}

F04D 29/665 ・・・・{by means of resonance chambers or interference}

F04D 29/666 ・・・{by means of rotor construction or layout, e.g. unequal distribution of blades or vanes}

F04D 29/667 ・・・{by influencing the flow pattern, e.g. suppression of turbulence}

F04D 29/668 ・・・{damping or preventing mechanical vibrations}

F04D 29/669 ・・{especially adapted for liquid pumps (F04D 29/18 takes precedence)}

F04D 29/68 ・・by influencing boundary layers {(by bleeding elastic fluid F04D 27/0215)}

F04D 29/681 ・・・{especially adapted for elastic fluid pumps}

F04D 29/682 ・・・・{by fluid extraction}

F04D 29/684 ・・・・{by fluid injection}

F04D 29/685 ・・・・{Inducing localised fluid recirculation in the stator-rotor interface}

F04D 29/687 ・・・・{Plasma actuators therefore}

F04D 29/688 ・・・{especially adapted for liquid pumps}

F04D 29/70 ・Suction grids; Strainers; Dust separation; Cleaning

F04D 29/701 ・・{especially adapted for elastic fluid pumps}

F04D 29/703 ・・・{specially for fans, e.g. fan guards}

F04D 29/705 ・・・{Adding liquids}

F04D 29/706 ・・・{Humidity separation}

F04D 29/708 ・・{specially for liquid pumps}

F04D 31/00 Pumping liquids and elastic fluids at the same time

F04D 33/00 Non-positive-displacement pumps with other than pure rotation, e.g. of oscillating type (F04D 35/00 takes precedence; hand-held fans A45B)

F04D 35/00 Pumps producing waves in liquids, i.e. wave.producers (for bath tubs A47K 3/10)