Patents Assigned to Sterling Fluid Systems and GmbH
  • Patent number: 7648344
    Abstract: Disclosed is a liquid ring pump with one or several stages, each of which comprises a working chamber, an impeller that is eccentrically mounted therein, flat control disks that axially delimit the working chamber on both sides, and ducts or chambers that are located adjacent to the control disks and deliver and discharge the transport gas to and from the working chamber. The inventive liquid ring pump is characterized in that the control disks are embodied in the same manner with identical suction ports and pressure ports while ports that are not needed are covered on the side facing away from the impeller.
    Type: Grant
    Filed: May 4, 2004
    Date of Patent: January 19, 2010
    Assignee: Sterling Fluid Systems (Germany) GmbH
    Inventors: Bernd Wenckebach, Silke Heetsch, Alfons Jünemann
  • Patent number: 7563075
    Abstract: A liquid ring pump comprises a first housing part that radially encloses two or more working chambers in which a rotatably mounted impeller is disposed in an eccentric manner, second and third housing parts that seal both sides of the first housing part and the pump, ducts or chambers for delivering and discharging the conveyed gas, and control disks that delimit the working chambers in an axial direction. The first housing part is embodied as a single piece while a connecting duct is provided which extends from the second to the third housing parts, and the ports facing the respective adjacent housing parts are configured such that the second and third housing parts can be embodied in an identical manner.
    Type: Grant
    Filed: May 4, 2004
    Date of Patent: July 21, 2009
    Assignee: Sterling Fluid Systems (Germany) GmbH
    Inventors: Bernd Wenckebach, Silke Heetsch, Alfons Jünemann
  • Patent number: 6485274
    Abstract: A displacement machine for compressible media includes at least two shafts. Each of the shafts has a rotor which is configured as a profiled body with the profiles of the rotors engaging one another in the manner of gearwheels during rotation and running without contact relative to one another. Each of the shafts is driven by an electric motor. The angular positions of each shaft is determined by an associated synchro resolver. Each of the synchro resolvers has a rotor and emits an electronic signal to the electric motor of the shaft such that the motors are electronically synchronized. Each of the shafts further has a gearwheel, with the gearwheels engaging one another and having an angular clearance which is smaller than that of the profiled bodies. At least one of the gearwheels is directly connected to the rotor of the synchro resolver associated with its shaft and both gearwheels together are releasably connected as a unit to the shaft.
    Type: Grant
    Filed: May 17, 2000
    Date of Patent: November 26, 2002
    Assignee: Sterling Fluid Systems (Germany) GmbH
    Inventor: Heiner Kösters
  • Patent number: 6359411
    Abstract: A displacement machine for compressible media has at least two shafts with rotors which are designed as helical profile bodies. During rotation, the profiles intermesh like gears and run free of contact relative to one another. The lead of the helical profile bodies decreases from the inlet end to the outlet end and have a double-start design, with the leads at the inlet end and outlet end of the helical profile bodies being constant, and the intermediate lead decreasing continuously from the larger lead at the inlet end to the smaller lead at the outlet end.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: March 19, 2002
    Assignee: Sterling Fluid Systems and GmbH
    Inventors: Heiner Kösters, Guido Keller
  • Patent number: 6328540
    Abstract: The rotary piston machine with an axial direction of delivery from the top downwards, in particular of screw spindle-type construction, with cooling ducts (12) for the motors (8), bearings (7) and sensors (9), through which ducts a cooling fluid flows, and with a cooling device for the pump space (3) is characterized in that the casing (2) of the pump space (3) has a closed annular space (15) which is partially filled with a liquid, which is cooled by the cooling fluid via heat exchanger surfaces (18).
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: December 11, 2001
    Assignee: Sterling Fluid Systems (Germany) GmbH
    Inventors: Heiner Kösters, Guido Keller
  • Patent number: 6296440
    Abstract: The invention relates to a side channel centrifugal pump with a housing forming a side channel (1). The housing surface adjacent to the side channel forms a front face (13) adjoining the impeller. The transition edge (2, 3, 7) between the side channel (1) and the front face (13) is rounded in the areas where it deviates from the circumferential direction. In the front plane, the blades (16) of the impeller have a predetermined web width in the circumferential direction. According to the invention, the radius (15) of the transition edge (7) is greater than 0.25 (sec/m) times the product of web width×blade speed where the impeller blades (16) exit from the front face (13, 14) and overlap into the area of the side channel (1). This reduces cavitation tilting and noise.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: October 2, 2001
    Assignee: Sterling Fluid Systems (Germany) GmbH
    Inventor: Peter Fandrey
  • Patent number: 6273696
    Abstract: Screw-spindle vacuum pump with at least three closed-off feed chambers located one behind the other along each rotor and method for operating this compressor. The chamber which is last on the delivery side is brought virtually to the compression limit pressure by means of pre-admission, shortly before it opens towards the delivery side, by supplying a pre-admission stream which is at least five times as great as the intake mass stream. A precondition, in this case, is a minimum ratio of external compression to internal compression of five.
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: August 14, 2001
    Assignee: Sterling Fluid Systems (Germany) GmbH
    Inventors: Heiner Kösters, Christian Dahmlos
  • Patent number: 5911565
    Abstract: The invention concerns a pump for conveying hot media wherein the pump has a pump housing, a seal housing (13, 14) disposed at a distance from the pump housing and is connected thereto, a bearing housing (19) connected to the pump housing via a Chinese lantern-shaped structure (7, 17, 18) and is disposed at a spacing from the seal housing, a fan wheel (22) disposed in the spacing, and a shaft (4) which penetrates the aforementioned parts. The delivery direction of the fan wheel extends from the connection between the pump housing and the seal housing (13, 14) towards the bearing housing (19) to enhance the cooling of the seal housing (13, 14) and of the bearing housing (19). To further enhance the thermal cooling properties, the drive motor is screed from the heated air flow by the bearing housing (19) and by a heat-insulating device (10) on the pump housing.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: June 15, 1999
    Assignee: Sterling Fluid Systems (Germany) GmbH
    Inventors: Ralf Mann, Hauke Kuhrt