Danfoss A/s

Palle Olsen

Erik Haugaard

Lars Martensen

Stig Kildegaard Andersen

Welm Friedrichsen

Ove Thorboel Hansen

Hans Christian Petersen

Poul Erik Hansen

Frank Holm Iversen

Lasse Nicolai Langmaack

Kim Loekkegaard Krogh

Anders Valbjoern

Henry Madsen Møller

Ove Thorbøl Hansen

A pump device () is provided comprising: a shaft (), rotor means () fixed to said shaft () in rotational direction, said rotor means () having pressure chambers () the volume of which varying during a rotation of said rotor means (), port plate means () having a through going opening () for each of said pressure chambers () and being connected to said rotor means () in rotational direction, and valve plate means () cooperating with said port plate means (). It is intended to pressurize a high volume of fluid, in particular water, within a limited space. To this end said rotor means () comprise a first rotor () and at least a second rotor (), both rotors being fixed to said shaft () in rotational direction, said first rotor () having at least a first pressure chamber () and said second rotor () having at least a second pressure chamber (), said port plate means () having a first port plate () and at least a second port plate (), said first port plate () having a through going opening () for said first pressure chamber () and being connected to said first rotor () in rotational direction, said second port plate () having a through going opening () for said second pressure chamber () and being connected to said second rotor () in rotational direction, said valve plate means () having a first valve plate () and at least a second valve plate (), said first valve plate () cooperating with said first port plate (), and said second valve plate () cooperating with said second port plate (), wherein at least one of said first rotor () and said second rotor () comprises force generating means () pressing said second port plate () against said second valve plate () even in absence of hydraulic pressure in said second pressure chamber ().

Pump device

A hydraulic machine is provided comprising a cylinder unit () having a plurality of cylinders () which are located on a circle line around an axis of rotation of said cylinder unit (), a valve plate () located at an axial end of said cylinder unit () and having a through-going opening () for each cylinder (), and a port plate, said valve plate () and said port plate resting against each other in sliding contact at a contact face, wherein a pressure in each cylinder () acts on a pressure area on a side of said valve plate () opposite said port plate. In such a hydraulic machine the risk of leaking should be kept small. To this end said pressure area () deviates from a circular form.

Hydraulic machine

A hydraulic arrangement () is provided comprising a pressure exchanger () having an axis () of rotation, and a booster pump (), said pressure exchanger () and said booster pump () being connected to each other. Such a hydraulic arrangement should have a good efficiency. To this end a single connection flange () is provided between said pressure exchanger () and the booster pump ().

Hydraulic arrangement

The invention concerns a reverse osmosis system () with at least one membrane unit () comprising an inlet (), a permeate outlet () and a concentrate outlet (), a high-pressure pump () that is connected to the inlet (), a pressure exchanger () comprising at least one high-pressure concentrate connection (HPC), and a booster pump. It is endeavored to achieve the lowest possible energy consumption. For this purpose, the booster pump is made as a displacement pump () that is arranged between the concentrate outlet () and the high-pressure concentrate connection (HPC) of the pressure exchanger ().

Reverse osmosis system

The invention concerns a reverse osmosis system () with a membrane unit () comprising an inlet (), a permeate outlet () and a concentrate outlet (), a high-pressure pump () that is connected to the inlet (), a pressure exchanger () connected on its concentrate side () to the concentrate outlet (), and a booster pump between the pressure exchanger () and the inlet (). It is endeavored to make the energy consumption as small as possible. For this purpose, the booster pump is made as a displacement pump.

The invention concerns a vane cell machine with a stator and a rotor having radially displaceable vanes arranged in guides, said vanes bearing on an inside of the stator and bordering, together with the rotor, the stator and a side wall, work chambers at each axial end of the rotor. It is endeavored to provide a vane cell machine that has a good internal tightness, in which the wear is still kept small. For this purpose, in a radially internal area the side wall comprises an insert that is axially movable in the side wall and has a pressure application surface axially inside and axially outside.

Vane cell machine having plates containing axial moving inserts bearing against the rotor

The invention concerns a hydraulic axial piston machine with a housing, in which a cylinder drum having at least one cylinder is arranged to be rotatable around an axis, in which cylinder is located a piston that is supported on a swashplate, whose inclination angle is adjustable in an adjustment plane. It is endeavored to keep the cost of manufacturing individual parts of the axial piston machine small. For this purpose it is provided that on the side facing away from the cylinder drum () the swashplate () has a spherical bearing surface (), which rests on a spherical supporting surface () in a bottom part () of the housing () and comprises an inclination protection (-), which counteracts an inclination of the swashplate () perpendicularly to the adjustment plane.

Hydraulic axial piston machine

The invention concerns a vane cell machine having a stator and a rotor that is made of a first material, the rotor having guides comprising radially displaceable vanes that rest on an inside of the stator and border work chambers at each axial end of the rotor together with the rotor, the stator and individual stationary side walls, the vanes having, at least at some contact faces with the rotor and the stator, a second material that interacts unfrictionally with the first material. It is endeavoured to keep the wear small. For this purpose, in a radially inner area, the side wall comprises a surface of a third material interacting unfrictionally with the first material and, in a radially outer area a surface made of the first material.

Vane cell machine

Motor start circuit for an induction motor, particularly a single-phase AC induction motor, with a main winding () and an auxiliary winding (), which are supplied with current, particularly alternating current, via current supply connections (), and with a start switching device () serving the purpose of interrupting the current flow through the auxiliary winding () after the start of the motor, the start switching device () being connected to a control device () via a connector (), the control device () being connected between the current supply connections (), and with a winding protection switch (), which is normally closed and which opens on the occurrence of a fault. The invention is characterized in that the control device () is connected to the winding protection switch () via at least one further connector (), preferably via at least one further connector () and the auxiliary winding ().

Water hydraulic machine

A water purification device includes a fluid pump, a diaphragm unit having a diaphragm, which separates a primary side from a secondary side, and a consumer having a pressure requirement. The fluid pump is connected with the primary side and the consumer is connected with the secondary side. In order to supply the consumer with water under a high pressure, the fluid pump supplies the pressure (P) for the consumer through the diaphragm. A pressure control valve is arranged upstream of the diaphragm unit to control the pressure on the primary side in dependence of the pressure on the secondary side.

Water purification device

The invention concerns a water-hydraulic machine with at least two mutually movable parts, of which one has a surface of a plastic material with friction-reducing properties. In such a machine it is desired to enable the use of demineralised water. For this purpose, it is ensured that a layer of a carbon-containing material is arranged between the plastics material and the other part.

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Nordborg, Denmark

Palle Olsen