公开(公告)号：US10828611B2

公开(公告)日：2020-11-10

申请号：US16304772

申请日：2017-05-22

Applicant: Xylem IP Management S.à r.l.

Inventor： Martin Wessman ,  Jürgen Mökander ,  Lars Uby

IPC: B01F15/00 ,  B01F3/04 ,  B01F5/10 ,  C02F3/12

Abstract: A treatment plant and method for controlling a treatment plant suitable for treatment of wastewater. The treatment plant includes a circulation channel housing liquid, a submersible flow generating machine arranged in the circulation channel and generating a liquid flow along the circulation channel, and a control unit that is operatively connected to the flow generating machine. The flow generating machine is driven in operation by the control unit. The method includes the steps of: driving the flow generating machine at a nominal speed, decreasing the rotational speed of the flow generating machine from the set nominal speed, detecting the rotational speed at which the torque of the flow generating machine is equal to a predetermined threshold, and determining the flow velocity of the liquid at the flow generating machine based on a predetermined relationship between the rotational speed of the flow generating machine and the flow velocity of the liquid.

公开(公告)号：US20200156029A1

公开(公告)日：2020-05-21

申请号：US16304772

申请日：2017-05-22

Applicant: Xylem IP Management S.à r.l.

Inventor： Martin Wessman ,  Jürgen Mökander ,  Lars Uby

IPC: B01F15/00 ,  B01F3/04 ,  B01F5/10 ,  C02F3/12

Abstract: A treatment plant and method for controlling a treatment plant suitable for treatment of wastewater. The treatment plant includes a circulation channel housing liquid, a submersible flow generating machine arranged in the circulation channel and generating a liquid flow along the circulation channel, and a control unit that is operatively connected to the flow generating machine. The flow generating machine is driven in operation by the control unit. The method includes the steps of: driving the flow generating machine at a nominal speed, decreasing the rotational speed of the flow generating machine from the set nominal speed, detecting the rotational speed at which the torque of the flow generating machine is equal to a predetermined threshold, and determining the flow velocity of the liquid at the flow generating machine based on a predetermined relationship between the rotational speed of the flow generating machine and the flow velocity of the liquid.

公开(公告)号：US10393122B2

公开(公告)日：2019-08-27

申请号：US15318841

申请日：2015-06-15

Applicant: XYLEM IP MANAGEMENT S.À R.L.

Inventor： Martin Larsson ,  Jürgen Mökander ,  Martin Zetterquist

IPC: F04D15/02 ,  F04D15/00 ,  F04D13/08 ,  F04B49/02 ,  F04B49/20 ,  F04D29/18 ,  F04D1/00

Abstract: A pump station arrangement and a method for turning off a pump configured for pumping liquid via a conduit. The pump, before being turned off, being driven at an operational frequency (FN) by a control unit. The method is characterized by the steps of, ramping down the frequency of the pump due to a turn off instruction, the terminal frequency of the ramping down being equal to the operational frequency (FN) of the pump minus at least 10 Hz and the ramping down time being at least a reflection time (TR) for the conduit in question, and the terminal frequency of the ramping down not being less than 10 Hz, and stopping the pump after the ramping down.