| 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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| 03/27/1991 | CN2073950U Healthy and energy-saving device on electric fan |
| 03/26/1991 | US5002459 Surge control system |
| 03/20/1991 | EP0418189A2 Gas turbine stall/surge identification and recovery |
| 03/20/1991 | CN2073499U Autometic opening device for multifunctional fan with duo-directional wind-speed and temp. |
| 03/20/1991 | CN2073498U Circulating winde circuit breaking controller |
| 03/20/1991 | CN2073495U Alternating current synchronous pendent fan with directive start device |
| 03/06/1991 | CN2072610U Simulated natural wind controller |
| 03/06/1991 | CN2072609U Multi-functional hanging fan electronic speed regulator with two lead wires |
| 02/27/1991 | EP0413987A2 Axial fan |
| 02/27/1991 | CN2072162U Wind guiding mechanism for electric fan |
| 02/21/1991 | DE4023258A1 Blocking reverse motion in cross-flow fan - involves use of pre-sprung blocking elements |
| 02/13/1991 | EP0412127A1 Method and system for controlling variable compressor geometry. |
| 02/13/1991 | CN2071270U Electronic speed adjuster of electric fan |
| 02/12/1991 | US4991389 Bleed modulation for transient engine operation |
| 02/05/1991 | US4990057 Electronic control for monitoring status of a compressor |
| 02/05/1991 | US4990053 Device for extending the performances of a radial compressor |
| 02/05/1991 | US4989403 Surge protected gas turbine engine for providing variable bleed air flow |
| 02/05/1991 | CA1279915C Calibration technique for variable speed motors |
| 01/30/1991 | CN2070373U Swing type fan |
| 01/23/1991 | EP0409157A2 Air filtering control system |
| 01/23/1991 | CN2069939U Electronic timing speed controller for ceiling fan |
| 01/16/1991 | EP0407750A1 Liquid friction coupling |
| 01/15/1991 | US4984425 Acceleration control for a gas turbine engine |
| 01/10/1991 | DE3920258A1 Supercharger for IC engine - has rotor working in conjunction with surrounding housing for compressing drawn-in combustion air |
| 01/09/1991 | EP0407297A1 By-pass device for a double-flow gas-turbine engine |
| 01/02/1991 | CN2068617U Analogue natural wind interrupted auto-controller of electric fan |
| 01/01/1991 | US4981018 Rotary machine |
| 12/25/1990 | US4979363 Fluid flow |
| 12/19/1990 | CN2067774U Multifunctional program controller for household electric fan |
| 12/18/1990 | US4978896 Method and apparatus for controlling a blower motor in an air handling system |
| 12/18/1990 | US4978279 Simplified inlet guide vane construction for a rotary compressor |
| 12/11/1990 | US4976588 Compressor control system to improve turndown and reduce incidents of surging |
| 12/11/1990 | US4976319 Water driven fan for firefighting |
| 12/05/1990 | EP0401152A2 Acceleration control for a gas turbine engine with duct pressure loss compensation |
| 12/05/1990 | CN2066912U Electric fan simulated natural wind device with electronic timer |
| 12/05/1990 | CN2066911U Pulse speed adjuster for computer controlled ventilation machine |
| 12/04/1990 | US4975024 Compressor control system to improve turndown and reduce incidents of surging |
| 11/29/1990 | WO1990014510A1 Compressor shroud air bleed passages |
| 11/28/1990 | EP0399931A1 Apparatus for remote control of suction or ventilation system |
| 11/28/1990 | CN2066524U Stepless speed adjuster for full speed rang interference-free fan |
| 11/22/1990 | EP0398436A1 Compressor control system to improve turndown and reduce incidents of surging |
| 11/21/1990 | CN2066087U Wind direction-adjusting device of electric fan |
| 11/21/1990 | CN2066086U Automatic graduating device of electric fan |
| 11/20/1990 | US4971516 Surge control in compressors |
| 11/20/1990 | US4971052 Breathing apparatus |
| 11/15/1990 | WO1990013745A1 An electronic control for monitoring status of a compressor |
| 11/14/1990 | CN2065689U Swing mechanism for ceiling fan |
| 11/13/1990 | US4969798 Diffuser for a centrifugal compressor |
| 11/07/1990 | CN2065257U Regulating device for oscillation range and speed of electric fan |
| 11/06/1990 | US4968215 Device for control of a turbocompressor |
| 11/06/1990 | US4967550 Active control of unsteady motion phenomena in turbomachinery |
| 10/18/1990 | DE4003940C1 Radial-flow compressor with inlet flow control - has inlet passage housing with three differently shaped passages between suction line and impeller |
| 10/16/1990 | US4962734 Electrically driven, circumferentially supported fan |
| 10/10/1990 | CN2063584U Steering device for ceiling fan |
| 10/03/1990 | EP0223207B1 Method and apparatus for the regulation of a turbo compressor for preventing surge |
| 09/26/1990 | EP0388461A1 Simplified inlet guide vane construction for a rotary compressor |
| 09/12/1990 | EP0386883A2 Ventilating fan for fire fighting |
| 09/12/1990 | EP0386200A1 Guide vane assembly for auxiliary power unit |
| 09/12/1990 | CN2061986U Speed-adjusting and nutural wind imitating remote controller for electric fan |
| 09/11/1990 | US4955785 Fan structure with flow responsive switch mechanism |
| 09/11/1990 | US4955585 Hydraulically driven fan system for water cooling tower |
| 09/07/1990 | WO1990010148A1 Method and system for controlling variable compressor geometry |
| 08/30/1990 | DE3905091A1 Blower |
| 08/29/1990 | CN2061223U Gentle breeze regulator for electric fan |
| 08/29/1990 | CN1044975A Oscillation angle adjuster for electric fan |
| 08/28/1990 | US4951870 Overtemperature control |
| 08/14/1990 | US4949276 Method and apparatus for preventing surge in a dynamic compressor |
| 08/14/1990 | US4948344 Controlled vortex regenerative pump |
| 08/14/1990 | US4948332 Method of preventing surge in a turbocompressor by regulating blow-off |
| 08/08/1990 | EP0381562A1 Process and device to control the operating point of a fan mounted on an agricultural apparatus |
| 08/08/1990 | CN2060187U Tilting heat control mechanism of electric fan |
| 08/08/1990 | CN1009126B Turbine fan with coder |
| 08/07/1990 | US4946343 Method of regulation that prevents surge in a turbocompressor |
| 08/01/1990 | CN1009025B Vacuum distributor |
| 07/31/1990 | US4944652 Process and device for the control of turbo compressors |
| 07/25/1990 | EP0378570A1 A device for measuring the volume flow of a fan. |
| 07/17/1990 | US4941437 Automotive radiator cooling system |
| 07/10/1990 | US4940391 Compressor surge detection system |
| 07/05/1990 | DE3900125A1 Rotation speed setting resistor |
| 07/04/1990 | CN2058941U 机械式定时程控器 Mechanical timing control box |
| 07/04/1990 | CN2058940U Nutural wind and breeze device for table fan |
| 07/03/1990 | US4938658 Method of reliably operating turbocompressors |
| 06/27/1990 | CN2058703U Folding gentle wind fan capable of infinitely regulating wind rate |
| 06/26/1990 | US4936741 Method of regulation that prevents surge in a turbocompressor by initiating blow-off when necessary |
| 06/26/1990 | US4936740 Method of protecting a turbocompressor from surging by blowing off through a blow-off valve and device for carrying out the method |
| 06/20/1990 | EP0374004A1 Bleed valve of a turbine engine compressor |
| 06/20/1990 | CN2058433U Mechanism for wilful adjusting electric fan shaking head angle |
| 06/12/1990 | US4933614 Motor drive control circuit |
| 06/12/1990 | US4932206 Guide vane assembly for auxiliary power unit |
| 06/06/1990 | CN2057976U Inductance stageless speed regulator of fan |
| 06/06/1990 | CN2057975U Thermo-couple natural wind controllor |
| 06/05/1990 | US4930979 Compressors |
| 06/05/1990 | US4930978 Compressor stage with multiple vented inducer shroud |
| 06/05/1990 | US4930320 Cooling fan controlling apparatus for vehicle with air conditioner |
| 06/05/1990 | US4930307 Ducted fan gas turbine engine with surge controller |
| 05/30/1990 | CN2057714U Stepless regulating device for electric fan rocker angle |
| 05/29/1990 | US4929150 Fluid transport system |
| 05/23/1990 | DE3911388A1 Device for the temperature-controlled arresting of the impeller wheel of a fan for internal combustion engines |
| 05/23/1990 | CN2057476U Micropower consumption speed regulator for electric fan |
| 05/23/1990 | CN2057475U Multifunctional controller for ceiling fan |