Patents Assigned to Wilo SE
  • Patent number: 10883507
    Abstract: The invention relates to a method for controlling at least one first circulation pump (17b, 17c) of a heating or cooling system (1) having a primary circuit (2, 2a) and a secondary circuit (4, 30a) coupled therewith at a transfer point (3, 29). The first circulation pump (17, 17b, 17c, 17b?) conveys a heating or cooling medium in the primary circuit (2, 2a), and in the second secondary circuit (4, 30a), at least one second circulation pump (12, 17d) is located that conveys a heating or cooling medium in at least one partial area of the secondary circuit (4, 30a). The volume flow rate (formula I) of the first circulation pump (17, 17b, 17c, 17b?) is controlled in functional dependence on the volume flow rate (formula II) of the secondary circuit (4, 30) behind the transfer point (3, 29). In this way, a demand based, and thus an energy-efficient control of the primary-side circulation pump is achieved.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: January 5, 2021
    Assignee: Wilo SE
    Inventor: Stephan Schmied
  • Patent number: 10788040
    Abstract: The present invention relates to a method of operating an electric motor-driven centrifugal pump (3) in a hydraulic system (4) having at least one self-controlled load, where a gradient (dQakt/dt) of the volumetric flow rate (Qakt) of the centrifugal pump (3) is determined and the current set-point delivery head (Hsoll) of the centrifugal pump (3) is calculated from a mathematical operation on the gradient (dQakt/dt) weighted with a gain factor (K) and the last specified set-point delivery head (Hsoll,alt). The operation describes a positive feedback between the set-point delivery head (Hsoll) and the volumetric flow rate (Qakt). The gain factor (K) is determined from a calculation instruction that is modified dynamically during operation of the centrifugal pump (3) taking into consideration the current operating point of the centrifugal pump (3) and taking into consideration a current and/or at least one past state of the hydraulic system (4).
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: September 29, 2020
    Assignee: WILO SE
    Inventors: Jens Oppermann, Ana Constantin
  • Patent number: 10519948
    Abstract: The invention relates to a method of operating a pressurized wastewater-drainage system (1) having interconnected line sections (SA1 . . . SA9) for conducting wastewater to a transfer station (10) and a plurality of pump stations (2) connected to the line sections (SA1 . . . SA9) for collecting the wastewater, wherein at least a portion of the pump stations (2) transmits at least status information indicating its respective pump standby status to a central controller (3), wherein a group is formed from the set of pump stations (2) that are in pump standby in relation to one of the line sections (SA1 . . . SA9) such that the number of pump stations (2) of the group corresponds at least to a minimum number (p_min) of pump stations (2) associated with this line section (SA1 . . . SA9), and the pump station (2) or pump stations (2) of the group are then activated simultaneously by the central controller (3).
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: December 31, 2019
    Assignee: WILO SE
    Inventor: Andrzej Szeroki
  • Patent number: 10184476
    Abstract: The invention relates to a method of determining a first hydraulic variable (Q) of a pump assembly (1) operated at a predefinable rotation speed (n0) from a mechanical or electrical variable (Mactual, Pel, nactual) by evaluating a correlation between the hydraulic variable (Q) with the mechanical or electrical variable (Mactual, Pel, nactual). A control parameter (Msetpoint, nsetpoint) of the pump assembly (1) is acted on by a periodic excitation signal (fA,n (t), fA,H(t)) having a predetermined frequency (f) such that a second hydraulic variable (H, ?p) is modulated. The instantaneous value of the first hydraulic variable (Q) is determined from the mechanical or electrical variable (Mactual (t), Pel (t), nactual (t)) as a system response (X(t)) to the excitation signal (fA,n (t), fA,H(t)), using the correlation. The invention further relates to a pump control system and a pump assembly that are configured for carrying out the method.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: January 22, 2019
    Assignee: WILO SE
    Inventors: Tilmann Sanders, Jens Fiedler
  • Patent number: 9920758
    Abstract: An eccentric screw pump comprising an outer part (2) and an inner part (3) therein, one of the parts (2, 3) being driven rotatably and the other part (2, 3) being able to move eccentrically relative to the other part (3, 2). The screwthreads (5a, 5b) of the outer part (2) extend angularly over less than an entire helix along the axial length (L) of the part, so that during operation pumping chambers that are open to both ends are created, through which sudden pressure relief takes place.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: March 20, 2018
    Assignee: WILO SE
    Inventors: Guenter Strelow, Thomas Mueller, Roland Stracke, Viktor Warkentin
  • Patent number: 9869326
    Abstract: The invention relates to a centrifugal pump, in particular a waste water submersible pump having an impeller (1), of which the end face facing the pump intake opening is open and only the end face of the impeller facing away from the intake opening (8) is covered by a circular coaxial impeller hub (2), on which the curved vanes (3, 4) are fastened, and in particular molded on, wherein the base plate (7) having the intake opening (8) facing the impeller (1) or at least one segment (7a) of the base plate is mounted so as to be movable against spring pressure (20) in such a way that the distance thereof from the impeller (1) and thus from the impeller vanes (3, 4) changes.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: January 16, 2018
    Assignee: WILO SE
    Inventors: Holger Stark, Alfred J. Otto, Wolfgang Geier, Bernd Kretschmer, Wolfgang Stroessner
  • Publication number: 20150292519
    Abstract: The invention relates to a centrifugal pump, in particular a waste water submersible pump having an impeller (1), of which the end face facing the pump intake opening is open and only the end face of the impeller facing away from the intake opening (8) is covered by a circular coaxial impeller hub (2), on which the curved vanes (3, 4) are fastened, and in particular moulded on, wherein the base plate (7) having the intake opening (8) facing the impeller (1) or at least one segment (7a) of the base plate is mounted so as to be movable against spring pressure (20) in such a way that the distance thereof from the impeller (1) and thus from the impeller vanes (3, 4) changes.
    Type: Application
    Filed: December 2, 2013
    Publication date: October 15, 2015
    Applicant: WILO SE
    Inventors: Holger Stark, Alfred J. Otto, Wolfgang Geier, Bernd Kretschmer, Wolfgang Stroessner
  • Publication number: 20100268389
    Abstract: The invention relates to a system and to a method for regulating a flow of liquid in a line, with a pump delivering the liquid to the consumer, tank or process. In particular, the invention relates to a sewage disposal system for public disposal of sewage, with a sewage pipe network comprising a plurality of sewage lines, and with at least one motor-driven pump delivering sewage through the sewage lines to a settling tank, to a service water support system for public supply of water, with a water supply pipe network comprising a plurality of water supply lines and with at least one motor-driven pump delivering service water through the water supply lines to a consumer, and to a liquid delivery system for providing a chemical liquid in a process, with a liquid pipe network comprising a plurality of pipelines and with at least one motor-driven pump delivering the chemical liquid into the process.
    Type: Application
    Filed: November 10, 2008
    Publication date: October 21, 2010
    Applicant: WILO SE
    Inventor: Frank-Hendrik Wurm
  • Patent number: D584694
    Type: Grant
    Filed: September 4, 2007
    Date of Patent: January 13, 2009
    Assignee: Wilo SE
    Inventor: Stephan Greitzke
  • Patent number: D595696
    Type: Grant
    Filed: September 4, 2007
    Date of Patent: July 7, 2009
    Assignee: WILO SE
    Inventor: Stephan Greitzke
  • Patent number: D603343
    Type: Grant
    Filed: January 6, 2009
    Date of Patent: November 3, 2009
    Assignee: Wilo SE
    Inventors: Kurt Mehnert, Jan Eickhoff
  • Patent number: D603807
    Type: Grant
    Filed: January 6, 2009
    Date of Patent: November 10, 2009
    Assignee: Wilo SE
    Inventors: Kurt Mehnert, Jan Eickhoff
  • Patent number: D603870
    Type: Grant
    Filed: January 6, 2009
    Date of Patent: November 10, 2009
    Assignee: WILO SE
    Inventors: Kurt Mehnert, Jan Eickhoff
  • Patent number: D623665
    Type: Grant
    Filed: April 12, 2010
    Date of Patent: September 14, 2010
    Assignee: Wilo SE
    Inventor: Gerhard Hunnekuhl
  • Patent number: D647537
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: October 25, 2011
    Assignee: WILO SE
    Inventors: Kurt Mehnert, Jan Eickhoff
  • Patent number: D874522
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: February 4, 2020
    Assignee: WILO SE
    Inventors: Markus Beukenberg, Jan Zimmermann, Kurt Mehnert