Danfoss A/s

Georg Enevoldsen

Stig Kildegaard Andersen

Poul Erik Hansen

Lars Bjarne Hilbrecht

Frank Holm Iversen

Sveinn Porarinsson

Kevin Evald

A pressure exchanger with a valve system includes a cylinder barrel (), two valve plates () and two port plates (), wherein the cylinder barrel () has at least one cylinder () which accommodates a piston (). The objective is to provide a pressure exchanger with low wear and a low maintenance effort. This objective is solved by a pressure exchanger including a piston () braking system and that the piston () includes a pressure relief arrangement.

Pressure exchanger

A reverse osmosis () system having a first membrane unit () and at least a second membrane unit (), the membrane units () forming a chain of membrane units, the first membrane unit () having a first membrane () separating a first feed chamber () and a first permeate chamber (), a first inlet () connected to the first feed chamber (), a first permeate outlet () connected to the first permeate chamber (), and a first concentrate outlet () connected to the first feed chamber (), the second membrane unit () having a second membrane () separating a second feed chamber () and a second permeate chamber (), a second inlet () connected to the second feed chamber (), a second permeate outlet () connected to the second permeate chamber (), and a second concentrate outlet () connected to the second feed chamber (), wherein the concentrate outlet () of a membrane unit () in the chain of membrane units is connected to an inlet () of a following membrane unit () and a concentrate outlet () of at least one membrane unit () downstream the first membrane unit () in the chain of membrane units is connected to a hydraulic motor (). In such a system the energy consumption should be optimized. To this end the hydraulic motor () is operatively connected to a first electric machine ().

Reverse osmosis system

Reverse osmosis () system having a first membrane unit () and at least a second membrane unit (), the membrane units () forming a chain of membrane units, the first membrane unit () having a first membrane () separating a first feed chamber () and a first permeate chamber (), a first inlet () connected to the first feed chamber (), a first permeate outlet () connected to the first permeate chamber (), and a first concentrate outlet () connected to the first feed chamber (), the second membrane unit () having a second membrane () separating a second feed chamber () and a second permeate chamber (), a second inlet () connected to the second feed chamber (), a second permeate outlet () connected to the second permeate chamber (), and a second concentrate outlet () connected to the second feed chamber (), wherein the concentrate outlet () of a membrane unit () in the chain of membrane units is connected to an inlet () of a following membrane unit () and a concentrate outlet () of at least one membrane unit () downstream the first membrane unit () in the chain of membrane units is connected to a hydraulic motor (). In such a system the energy consumption should be optimized. To this end the hydraulic motor () is operatively connected to a first electric machine ().

The invention relates to a device for supplying ports to a machine section () of a hydraulic machine arrangement (), the device () comprising a low-pressure inlet port (), a leakage inlet (), a low-pressure chamber () having a low-pressure opening () for establishing fluid communication with the machine section (), a high-pressure outlet port (), and a high-pressure chamber () that is in fluid communication with the high-pressure outlet port (), the high-pressure chamber () having a high-pressure opening () for establishing fluid communication with the machine section (), wherein the low-pressure inlet port () is in fluid communication with the low-pressure chamber (), wherein a leakage path () extends from the high-pressure chamber () through the machine section () to the leakage inlet (), characterized in that the device () further comprises a control valve member () connecting the leakage inlet () to the low-pressure chamber (), wherein the control valve member () transfers to an open state when a pressure in the leakage inlet () with respect to a pressure in the low-pressure chamber () is higher than a predefined control pressure threshold. The device () reduces cavitation in hydraulic machine arrangements ().

Device for supplying ports to a machine section of a hydraulic machine arrangement

A hydraulic machine is described comprising a first part () and a second part (), wherein the first part () and the second part () are movable relatively to each other in abutting relation, the first part () comprises a pressure chamber () having a pressure chamber opening () in a contact face () contacting a sealing face () of the second part (), the second part () comprises a low pressure area () connected to a low pressure opening () in the sealing face () and a high pressure area () connected to a high pressure opening () in the sealing face (), wherein during a movement of the first part () with respect to the second part () in a moving direction () the pressure chamber opening () comes alternatingly in overlap with the low pressure opening () and the high pressure opening (). Such a machine should be flexible in operation with low risk of damages caused by cavitation. To this end a throttling channel () in the second part () connects the low pressure area () with an area in the sealing face () in moving direction in front of the low pressure opening ().

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Nordborg, Denmark

Georg Enevoldsen