| Patents for F04D 27 - Control, e.g. regulation, of pumps, pumping nstallations or pumping systems specially adapted for elastic fluids (9,590) |
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| 01/11/2000 | US6012897 Free rotor stabilization |
| 01/04/2000 | US6010315 Compressor for use in refrigerator |
| 01/04/2000 | US6010303 Apparatus and method of predicting aerodynamic and aeromechanical instabilities in turbofan engines |
| 12/29/1999 | WO1999067519A1 Device for compressing a gaseous medium and systems comprising such device |
| 12/29/1999 | EP0967396A2 Method for operation of turbo compressors |
| 12/29/1999 | EP0967394A1 Turbo molecular pump |
| 12/29/1999 | EP0904514B1 Ventilation system, particularly for use in the agricultural field |
| 12/28/1999 | US6008603 Brushless DC motor assembly control circuit |
| 12/22/1999 | CN2355148Y Automatic rotation rate regulator for temperature controlling fan |
| 12/22/1999 | CN2355144Y Fan with fragrant releasing timely |
| 12/16/1999 | WO1999064667A1 Control system for a vacuum pump used for removing liquid and a method of controlling said pump |
| 12/15/1999 | CN2353949Y Move-range regulating mechanism for electric fan |
| 12/07/1999 | US5997254 Air blower for a refrigeration unit |
| 12/07/1999 | US5996898 Automatic occupancy and temperature control for ceiling fan operation |
| 12/07/1999 | US5996331 Passive turbine coolant regulator responsive to engine load |
| 11/25/1999 | WO1999060272A1 Device and method for evacuation |
| 11/25/1999 | DE19822258A1 Electric bathroom ventilator fan with extended operation after use in windowless rooms |
| 11/25/1999 | DE19822257A1 Electrically driven fan for force-ventilated rooms |
| 11/24/1999 | CN2350574Y Swing angle controlling device |
| 11/17/1999 | EP0956447A2 Motor-driven centrifugal air compressor |
| 11/17/1999 | CN2349393Y Turning angle controller for swing type electric fan |
| 11/16/1999 | US5984625 Actuator bandwidth and rate limit reduction for control of compressor rotating stall |
| 11/09/1999 | US5980199 Performance centrifugal blower apparatus including at least two suction inlets, and associated blower method |
| 11/04/1999 | DE19837014C1 Circuit arrangement for regulating number of revolutions of cooling fan |
| 10/28/1999 | WO1999054628A1 Adapted surge limit in a centrifugal compressor |
| 10/26/1999 | US5971725 Vacuum pumping device |
| 10/26/1999 | US5971712 Method for detecting the occurrence of surge in a centrifugal compressor |
| 10/21/1999 | DE19815949A1 Ventilation unit for windowless rooms, toilets and baths |
| 10/20/1999 | CN1045812C Rotary compressor with stabilizing and reinforcing structure |
| 10/19/1999 | US5967742 Method and apparatus for preventing surge while taking a turbocompressor off-line from a parallel configuration |
| 10/14/1999 | WO1999051866A2 Compressor endwall bleed system |
| 10/14/1999 | DE19823274C1 Turbocharger for motor vehicle internal combustion engine |
| 10/13/1999 | CN2343401Y Program controller for electric fan |
| 10/05/1999 | US5961291 Turbo vacuum pump with a magnetically levitated rotor and a control unit for displacing the rotator at various angles to scrape deposits from the inside of the pump |
| 09/29/1999 | EP0945623A2 A ventilation system |
| 09/29/1999 | CN2340956Y Oscillation mechanism of electric fan |
| 09/23/1999 | WO1999047815A1 Multi-stage axial compressor for aircraft engines |
| 09/23/1999 | DE19812437A1 Radial rotor wheel for conveying gaseous substances such as air in ventilators |
| 09/23/1999 | DE19812157A1 Regulating gas flow in compressor station, especially one connected into natural gas pipe network |
| 09/14/1999 | US5952798 Brushless DC motor assembly control circuit |
| 09/14/1999 | US5951240 Method and apparatus for improving antisurge control of turbocompressors by reducing control valve response time |
| 09/14/1999 | US5950308 Vaned passage hub treatment for cantilever stator vanes and method |
| 09/09/1999 | DE19808352A1 Fixing element for fan for computer |
| 09/08/1999 | EP0939923A1 Method for detecting the occurrence of surge in a centrifugal compressor |
| 09/08/1999 | CN2337335Y Button type speed regulator of electric fan |
| 09/07/1999 | US5947691 Winding supply circuit with current and thermal protective elements |
| 09/07/1999 | US5947680 Turbomachinery with variable-angle fluid guiding vanes |
| 09/01/1999 | EP0939230A2 Guiding device for a movable element |
| 09/01/1999 | EP0939229A2 Roller assembly for guiding an actuating ring |
| 09/01/1999 | EP0939228A1 Drive controller for motor-driven high-speed rotating body and method for discriminating type of machine used therefor |
| 08/31/1999 | US5944049 Apparatus and method for regulating a pressure in a chamber |
| 08/26/1999 | WO1999042240A1 Diagnosing and controlling rotating stall and surge in rotating machinery |
| 08/24/1999 | US5941095 Low temperature low pressure helium compression |
| 08/18/1999 | EP0936357A2 Compressor bleed valve |
| 08/17/1999 | US5940576 Electronic control unit for a vacuum pump |
| 08/17/1999 | US5938407 Battery driven backup system for an air distribution fan |
| 08/17/1999 | US5937661 Compressor for use in refrigerator |
| 08/12/1999 | WO1999040325A1 Method and device for regulating a delivery quantity |
| 08/12/1999 | DE19804330A1 Verfahren zum Regeln eines Verdichters A method for controlling a compressor |
| 08/05/1999 | DE19801041C1 Method of operating radial pump |
| 08/04/1999 | EP0826265B1 Electric drive system for railway vehicles and guided vehicles |
| 08/04/1999 | EP0826264B1 Electric drive system for railway vehicles and guided vehicles |
| 07/30/1999 | CA2259712A1 Method and apparatus for controlling an induction motor |
| 07/28/1999 | EP0932091A2 Method and apparatus for limiting a critical variable of a group of compressors or an individual compressor |
| 07/27/1999 | US5927939 Turbomachine having variable angle flow guiding device |
| 07/14/1999 | EP0929019A1 System for providing pressure regulation in an enclosure under suction from a vacuum pump |
| 07/14/1999 | CN2328820Y Positioning device for small heat radiation fan stator inductive element |
| 07/13/1999 | US5921753 Anti-windmilling device |
| 06/30/1999 | EP0926347A2 Method of detecting stalls in a gas turbine engine |
| 06/30/1999 | CN2326761Y Water-pump pressure-less inspection device |
| 06/30/1999 | CN2326760Y Water-pump pressure-less inspection device |
| 06/29/1999 | US5915917 Compressor stall and surge control using airflow asymmetry measurement |
| 06/17/1999 | DE19754820A1 Air-conditioning or ventilating device |
| 06/16/1999 | EP0654162B1 Process for detecting fouling of an axial compressor |
| 06/16/1999 | EP0654161B1 Process and device for monitoring and for controlling of a compressor |
| 06/15/1999 | US5913248 Surge detection device and turbomachinery therewith |
| 06/08/1999 | CA2136808C Apparatus and method for efficiency and output capacity matching in a centrifugal fan |
| 06/02/1999 | CN1218551A Methods and apparatus for detecting surge in centrifugal compressors |
| 06/02/1999 | CN1218147A Low profile ceiling fan having remote control receiver |
| 06/01/1999 | US5908462 Method and apparatus for antisurge control of turbocompressors having surge limit lines with small slopes |
| 05/26/1999 | EP0918161A1 Device for controlling rotation of a fan |
| 05/26/1999 | CN1217436A Compressor |
| 05/19/1999 | EP0916907A2 Mobile hot air blower |
| 05/19/1999 | EP0916026A1 Process for regulating a unit or a frequency converter |
| 05/19/1999 | CN2319610Y Multi-stage regulating mechanism able to change swing angle of fan |
| 05/18/1999 | US5904471 Cooling means for a motor-driven centrifugal air compressor |
| 05/18/1999 | US5903941 Air control system for an air bed |
| 05/06/1999 | WO1999022146A1 Suction flow preswirl control bypass structure for blowers |
| 05/06/1999 | EP0913585A1 Compressor |
| 04/28/1999 | CN2316492Y Rotation angle regulator for electric fan |
| 04/28/1999 | CN1215452A Turbomachinery driving apparatus and method of controlling the same |
| 04/27/1999 | US5897299 Anti-reverse rotation apparatus of compressor |
| 04/24/1999 | CA2247486A1 Low profile ceiling fan having a remote control receiver |
| 04/20/1999 | US5894736 Methods and apparatuses for detecting surge in centrifugal compressors |
| 04/14/1999 | CN2314135Y Indicator for start/stop of compressor |
| 04/14/1999 | CN2314134Y Adjustor for direction and force of wind |
| 04/13/1999 | CA2231913C Centrifugal fan unit with vertical rotation axis |
| 04/07/1999 | CN1213045A Drive positioning mechanism with backlash adjustment for variable pipe diffuser |
| 03/31/1999 | EP0904514A1 Ventilation system, particularly for use in the agricultural field |
| 03/31/1999 | CN2312351Y Full automatic control device for pumping water |