公开(公告)号：US10367439B2

公开(公告)日：2019-07-30

申请号：US15938420

申请日：2018-03-28

Applicant: GRUNDFOS HOLDING A/S

Inventor： Klaus Vestergaard Kragelund ,  Jan Plougmann ,  Jan Carøe Aarestrup

IPC: F04B17/03 ,  H02P23/00 ,  H02P25/024 ,  H02P25/16 ,  H02P27/08 ,  F04D15/00 ,  F04D13/06 ,  H02P29/40 ,  H02P21/00

Abstract: A pump assembly (1) includes a pump unit (2) capable of providing a desired head (H0) at zero flow rate, a brushless speed-controlled permanent-magnet AC drive motor (205) for driving the pump unit (2), and a control unit for controlling the drive motor (205). The control unit includes a frequency converter configured to receive an input voltage (Uin). The drive motor (205) is operable in a field-weakening mode and non-field-weakening mode. The drive motor (205) is undersized for driving the pump unit (2) at a design input voltage (U0) to provide a lower head (H) than the desired head (H0) at zero flow rate in the non-field-weakening mode and for driving the pump unit (2) to provide the desired head (H0) at zero flow rate in the field-weakening mode.

公开(公告)号：US10119629B2

公开(公告)日：2018-11-06

申请号：US15066242

申请日：2016-03-10

Applicant: GRUNDFOS HOLDING A/S

Inventor： Søren Emil Sørensen ,  Per Hovmand ,  Steen Mikkelsen ,  Jens Kjær Milthers ,  Kim Hulegaard Jensen ,  Jan Carøe Aarestrup

IPC: F16K51/00 ,  F16K37/00 ,  F16K27/00 ,  F16K31/02 ,  F24D3/10

Abstract: A hydraulic valve includes a valve housing (4) with an inside that defines at least one first flow path (7), and with a valve insert (16) which is arranged in the inside of the valve housing (4). The valve insert (16) includes a movable valve element (14) situated in the first flow path (7). An infrared temperature sensor (46) is arranged on or in the valve housing (4) and is directed onto a surface of the valve insert (16) or a surface of a thermal conductor (48) connected to the valve insert. A hydraulic manifold may be provided with such a hydraulic valve.