| 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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| 03/04/1992 | CN2097916U Electric fan time speed regulator |
| 03/04/1992 | CN1059191A Fully automatic controller for dual direction ventilating fan |
| 03/01/1992 | WO1992003660A1 Performance characteristics stabilisation in a radial compressor |
| 03/01/1992 | CA2090615A1 Performance characteristics stabilization in a radial compressor |
| 03/01/1992 | CA2039511A1 Inlet air flow control for centrifugal fans |
| 02/26/1992 | CN2097306U Electric fan capable of generating random natural wind |
| 02/19/1992 | CN2096665U Stepless speed regulator for fan |
| 02/06/1992 | DE4023363A1 Burner with air flow regulation - has sliding sleeve to control output from fan which supplies combustion air |
| 02/06/1992 | DE4023166A1 RPM regulator for AC fan motor - has resistance tapping arranged in load circuit and step switching unit contg. rectifiers |
| 01/30/1992 | DE4024046A1 Speed control for brushless DC motor-driven fan - adjusts stator power supply in response to operational amplifier switching by variable resistance in air stream |
| 01/29/1992 | EP0468676A1 Compressors |
| 01/29/1992 | CN2094633U Gear type wind volume adjusting structure for miniature ceiling fan |
| 01/22/1992 | CN1058076A Ac fan system for train (ship) |
| 01/21/1992 | US5082421 Active control of unsteady motion phenomena in turbomachinery |
| 01/21/1992 | US5081913 Air vent closure system |
| 01/15/1992 | CN2093257U Sleeping natural wind controller for electric fan |
| 01/15/1992 | CN2093256U Stepless speed regulation device for electric fan |
| 01/15/1992 | CN2093255U Head-shaking mechanism of electric fan with angular stepless selection and regulation |
| 01/08/1992 | CN2092619U Stepless, temp.-controlled speed adjustors for electric fans |
| 01/03/1992 | WO1992000492A1 Method and device for controlling air supply in a network of passages |
| 01/03/1992 | CA2065252A1 Method and device for controlling air supply in a network of passages |
| 01/01/1992 | CN1057509A Multifunctional air-conditioning fan |
| 12/30/1991 | CA2036821A1 Bypass valve system |
| 12/25/1991 | CN2091371U Breeze control unit of electric fan |
| 12/24/1991 | US5074467 High volume low pressure spray painting system, method of operation and control system therefor |
| 12/18/1991 | CN2090890U Dc brushless circumference ceiling fan |
| 12/05/1991 | DE4117611A1 Continuous monitoring equipment for variable air floor - controls electrical motor according to air demand signal and computed efficiency |
| 12/03/1991 | US5070267 Low-noise electric motor assembly for automotive blower |
| 11/28/1991 | WO1991018208A1 Air control valve |
| 11/27/1991 | CN2089542U Temp. controlled speed adjusting device of electric fan |
| 11/27/1991 | CN2089541U 多功能电风扇控制器 Multifunctional Fan Controller |
| 11/19/1991 | US5066197 Hydrodynamic bearing protection system and method |
| 11/19/1991 | US5065590 Refrigeration system with high speed, high frequency compressor motor |
| 11/14/1991 | WO1991017491A1 Flow rate adjusting method in an air blowing device and device implementing such method |
| 11/05/1991 | CA1291737C Method and apparatus for preventing surge in a dynamic compressor |
| 10/31/1991 | WO1991016544A1 Method and apparatus for stabilizing the pressure of a centrifugal fan |
| 10/30/1991 | CN1014538B Fan with code device |
| 10/23/1991 | CN1055587A Industrial draught fan with numerically-controlled operation conditions |
| 10/23/1991 | CN1055586A Industrial pump set with controlled operation conditions |
| 10/22/1991 | US5059093 Compressor bleed port |
| 10/22/1991 | US5059091 Gas turbine engine compressor assembly |
| 10/09/1991 | CN2086334U Fan with pressurizing device |
| 10/09/1991 | CN2086333U Wind electric locking device of mine part fan |
| 10/08/1991 | US5054294 Compressor discharge temperature control for a variable speed compressor |
| 10/08/1991 | US5054286 Bypass valve system |
| 10/02/1991 | CN2085869U Circuit apparatus for speed-varying of electric fan |
| 10/01/1991 | US5052899 Anti-surge compressor loading system |
| 09/25/1991 | CN1054816A Multifunctional controller for electric fan without interference |
| 09/24/1991 | US5051918 Gas turbine stall/surge identification and recovery |
| 09/18/1991 | CN2085113U Intelligent timing stepless speed regulator |
| 09/17/1991 | US5050092 Fan efficiency measuring apparatus |
| 09/17/1991 | CA1288959C Method for increasing the efficiency of gas turbine generator systems using low btu gaseous fuels |
| 09/10/1991 | US5046928 Long term compressor control apparatus |
| 09/04/1991 | CN1054296A Operation control circuit for pump motor |
| 09/03/1991 | US5044153 Turbojet compressor blow off valves with water collecting and discharge means |
| 08/28/1991 | CN2083651U Ceiling fan electronic timing speed regulator |
| 08/28/1991 | CN2083650U Fan air guiding wheel speed regulator |
| 08/27/1991 | US5042245 Gas turbine engine |
| 08/22/1991 | WO1991012149A1 Ventilator fan |
| 08/14/1991 | CN2082780U Ultra-low-speed timing automatic speed regulator for electric fan |
| 07/31/1991 | EP0412127A4 Method and system for controlling variable compressor geometry |
| 07/24/1991 | CN2081441U Multi-functional electronic antijamming hanging fan controller |
| 07/17/1991 | CN2081006U Revolution speed and delay controller for electric fan |
| 07/17/1991 | CN2081005U Autocontroller for gust wind of electric fan |
| 07/16/1991 | US5032062 Compressor demand control system for long term compressor operation |
| 07/10/1991 | CN2080583U Multifunction electronic adjuster for ceiling fan |
| 07/10/1991 | CN2080582U Interval timing auto-switch for fan |
| 07/03/1991 | EP0435294A2 A surging prediction device for a centrifugal compressor |
| 07/03/1991 | CN2080112U Automatic stop device for electric fan when touching the cover |
| 06/27/1991 | WO1991009230A1 Variable speed turbo vacuum pump |
| 06/25/1991 | US5025629 High pressure ratio turbocharger |
| 06/12/1991 | EP0431287A1 Process for optimised operation of two or more compressors in parallel or series operation |
| 06/12/1991 | CN1052170A Acceleration control for gas turbine engine with duct pressure loss compensation |
| 06/11/1991 | US5022224 Acceleration control with duct pressure loss compensation |
| 05/30/1991 | WO1991007712A1 Simple surge control for compressors with improved response |
| 05/29/1991 | CN2077919U Timely speed-auto adjusting device for electric fans |
| 05/29/1991 | CN2077918U Electric fan-key switch with sleep-wind generating feature |
| 05/29/1991 | CN1012698B Device for extending performance of radial flow compressor |
| 05/28/1991 | US5019757 Method and apparatus for controlling a blower motor in an air handling system to provide constant pressure |
| 05/22/1991 | CN2077498U Automatically intermittent device for electric fan |
| 05/22/1991 | CN2077497U Oscillating unit of fan with 100 degree changing or continuously rotating function |
| 05/08/1991 | EP0425651A1 Compressor shroud air bleed passages |
| 05/07/1991 | US5012637 Method and apparatus for detecting stalls |
| 05/01/1991 | CN2076179U Adjustable-wind electric fan |
| 05/01/1991 | CN2076178U Anti-interference ultrasonic remote controller |
| 05/01/1991 | CN2076177U Steering gear for ceiling fan |
| 05/01/1991 | CN2076176U Miniature ceiling fan |
| 04/30/1991 | US5010739 Air conditioning apparatus having audible sound level control function |
| 04/30/1991 | US5010727 Method for evaluating the working line characteristics of a compressor of a gas turbine engine |
| 04/25/1991 | DE4028091A1 Car air conditioning radial-flow fan - has annular gap on housing suction side for direct coupling of suction and pressure chambers |
| 04/24/1991 | CN2075721U Mosquito expelling electric fan |
| 04/24/1991 | CN2075719U 电磁风机 Electromagnetic Fan |
| 04/17/1991 | CN2075403U Timer for circulatory stopping rotation of fan |
| 04/17/1991 | CN2075273U Wire telecontroller for rotating vane type electric fan |
| 04/10/1991 | CN2074837U Flow changeable toy blower |
| 04/10/1991 | CN2074836U Quick starting safety health care electric fan |
| 04/09/1991 | US5005353 Active control of unsteady motion phenomena in turbomachinery |
| 04/03/1991 | EP0419798A1 Volume flow measuring device for radial fan |
| 03/27/1991 | CN2073952U Multimode automatic speed-regulating device for electric fan |
| 03/27/1991 | CN2073951U Automatic controller for electric fan |