Patents
Sitemap › F04 - Positive-displacement machines for liquids; Pumps for liquids or elastic fluids › F04D - Non-positive-displacement pumps › F04D 27 - Control, e.g. regulation, of pumps, pumping nstallations or pumping systems specially adapted for elastic fluids
Patents for F04D 27 - Control, e.g. regulation, of pumps, pumping nstallations or pumping systems specially adapted for elastic fluids (9,590)
03/1999
03/30/1999US5889469 Fan pulse alarm using two stage comparator for speed detection
03/24/1999CN2311645Y Ventilating fan controlled by computer
03/24/1999CN1212051A Surge prevention control system for dynamic compressors
03/24/1999CN1212038A Surge recurrence prevention control system for dynamic compressors
03/17/1999EP0902179A2 Bleed valve system
03/17/1999CN2310886Y Double automatic speed change device for electric fan
03/16/1999US5881564 Compressor for use in refrigerator
03/10/1999EP0900940A2 Method of operating a vacuum pump
03/09/1999US5879133 Prevention of parameter excursions during process compressor surge in gas turbines
03/04/1999DE19737665A1 Blower for cooling internal combustion engine
03/02/1999US5875966 Dual mode input signal conditioner
02/1999
02/25/1999WO1999009642A1 Circuit
02/24/1999EP0898083A2 Vacuum pumping system
02/24/1999CN2308753Y Household blower controller
02/23/1999US5874683 Characteristic comparative measurement system of motor fan in vacuum cleaner
02/23/1999US5873696 Fluid handling pump
02/23/1999US5873257 System and method of preventing a surge condition in a vane-type compressor
02/17/1999CN2307949Y Pumping with adjustable eccentricity
02/10/1999EP0896157A1 Drive positioning mechanism with backlash adjustment for variable pipe diffuser
01/1999
01/28/1999WO1999004325A1 An apparatus and method for regulating a pressure in a chamber
01/28/1999WO1999004171A1 Drive controller for motor-driven high-speed rotating body and method for discriminating type of machine used therefor
01/26/1999US5863178 Exhaust turbocharger for internal combustion engines
01/26/1999CA2172292C Bleed valve
01/20/1999EP0891522A1 Methods and apparatuses for detecting surge in centrifugal compressors
12/1998
12/30/1998WO1998059201A1 Blowphone
12/30/1998EP0887557A1 Free rotor stabilization
12/30/1998EP0887556A1 Turbo-molecular pump
12/30/1998EP0887555A1 Method for determining the operating point of a fan and the fan
12/30/1998CN1203320A Free rotor stabilization
12/23/1998EP0886069A2 Turbomachinery with variable angle fluid guiding devices
12/22/1998US5851103 Turbomachinery with variable angle fluid guiding devices
12/22/1998US5850733 Gaseous fuel compression and control system and method
12/17/1998DE19725074A1 Alarm module for monitoring ventilation of electronic apparatus
12/16/1998CN2300750Y Fan controller using pulse widening technology
12/09/1998EP0855923A4 Flow estimation and compensation of flow-induced pressure swings in cpap treatment and assisted respiration
12/08/1998US5845509 Variable speed parallel centrifugal compressors for HVAC and refrigeration systems
12/08/1998US5845482 Combined bleed valve and annular diffuser for gas turbine inter compressor duct
12/01/1998US5842833 Gas separation control in a centrifugal pump vacuum pump
11/1998
11/25/1998EP0826266B1 Electric motor drive
11/24/1998US5839374 Blower for generating static pressure
11/19/1998DE19720827A1 Radial compressor with pre and post=guide vane devices control procedure
11/11/1998EP0780032B1 Circuit for operating an electric motor
11/10/1998US5833433 Rotating machinery noise control device
11/10/1998US5832606 Method for preventing one-cell stall in bladed discs
11/04/1998EP0842361A4 Circulator pump check valve
11/04/1998EP0628149B1 Control system for an air conditioning/refrigeration system
11/04/1998CN2296421Y Speed regulator for ceiling fan
11/04/1998CN1197736A Method and apparatus for variably controlling speed of cooling fan motor in automobile
10/1998
10/27/1998US5827044 Fan system with variable air volume control
10/22/1998WO1998030790A3 Cooling means for a motor-driven centrifugal air compressor
10/22/1998DE19715167A1 Arrangement for operating fan or water pump with power tracking, especially with solar panel
10/22/1998DE19714856A1 Ventilatorkühleinrichtung Fan cooling device
10/21/1998EP0871853A1 Surge prevention control system for dynamic compressors
10/21/1998EP0871818A1 Surge recurrence prevention control system for dynamic compressors
10/21/1998CN2295067Y Device for regulating clearance between deep-well pump impeller and turbine cylinder
10/20/1998US5825642 Power supply apparatus
10/15/1998WO1998045934A1 Fan cooler
10/13/1998US5820642 Pressurized air supply apparatus
10/13/1998US5819524 Gaseous fuel compression and control system and method
10/07/1998EP0868611A1 Electric-motor-driven blower
10/06/1998US5818194 Direct replacement variable speed blower motor
09/1998
09/30/1998EP0867619A2 Fan system with variable air volume control
09/23/1998EP0865147B1 Electric fan
09/17/1998WO1998040629A1 Vacuum pumping apparatus
09/17/1998WO1998040613A1 Device for improving turbocharger dynamic characteristics
09/17/1998DE19708953A1 Side channel compressor with bladed rotor wheel
09/16/1998EP0865147A1 Electric fan
09/15/1998US5807081 Combination valve for screw compressors
09/15/1998US5807071 Variable pipe diffuser for centrifugal compressor
09/09/1998CN2290716Y Start and control device of blower
09/09/1998CN1192800A Method for controlling function of centrifugal pump and vacuum pump combination, and gas separating centrifugal pump
09/02/1998CN1191958A Combination valve for screw compressors
08/1998
08/27/1998WO1998037328A1 Device for controlling rotation of a fan
08/27/1998DE19718092A1 Procedure for compressing gases such as Helium for use with super conductors in particle accelerators
08/25/1998US5798941 Surge prevention control system for dynamic compressors
08/19/1998CN2288298Y Automatic controller
08/18/1998US5794432 Variable pressure and variable air flow turbofan engines
08/12/1998EP0857876A2 Method and apparatus to control the suction capacitiy of vacuum pumps
08/11/1998US5791763 Electronic control battery-operated device of lamp with fan
08/05/1998EP0855923A1 Flow estimation and compensation of flow-induced pressure swings in cpap treatment and assisted respiration
07/1998
07/30/1998WO1998032972A1 Turbo molecular pump
07/29/1998CN1188857A Improved performance centrifugal blower apparatus including at least two suction inlets, and associated blower method
07/22/1998EP0736142B1 Non-recoverable surge and blowout detection in gas turbine engines
07/21/1998US5782603 Process and apparatus for recovery from rotating stall in axial flow fans and compressors
07/16/1998WO1998030790A2 Cooling means for a motor-driven centrifugal air compressor
07/14/1998US5779440 Flow energizing system for turbomachinery
07/08/1998EP0852295A1 Compressor with valve for by-pass and anti-reverse rotation control
07/01/1998EP0851127A2 Diagnostic method and apparatus for vacuum pumps
06/1998
06/30/1998US5772711 Filter blockage warning indicator
06/30/1998US5772399 For generating a desired air mass flow through an air delivery system
06/23/1998US5770933 Blower motor with adjustable timing
06/23/1998CA2015509C Method and apparatus for controlling a blower motor in an air handling system
06/16/1998US5767780 Detector for flow abnormalities in gaseous diffusion plant compressors
06/16/1998US5765998 Process and apparatus for ensuring the operability of gas seals in turbocompressors
06/16/1998US5765991 Process and device for operating dynamic-type compressors with regulators with high proportional amplification
06/10/1998CN1184568A Electric motor drive
06/10/1998CN1184567A Electric drive system for railway vehicles and guided vehicles
06/09/1998US5762470 Anti-stall tip treatment means
06/09/1998US5762468 Process for protecting a turbocompressor from operation in the unstable working range by means of fittings with two different regulating speeds
05/1998
05/20/1998EP0842361A1 Circulator pump check valve
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