Danfoss A/s

Sauer Danfoss Aps

Danfoss Compressors Gmbh

Secop Gmbh

Danfoss Power Solutions Aps

Poul Erik Hansen

Stig Kildegaard Andersen

Erik Haugaard

Brian Kongsgaard Nielsen

Torben Ole Andersen

Frank Holm Iversen

Palle Olsen

Georg Enevoldsen

J&uuml;rgen Bachmann

Lars L Finsen

Svend Erik Thomsen

Thorkild Christensen

Jan Dyhr

Jan Thomsen

Tommi Kolb

Henry Madsen Møller

Achuthan Babu

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 pressure exchanger () including a housing (), a drive shaft () and a cylinder drum () rotatably arranged in the housing () is described, the cylinder drum () including two front faces and at least one cylinder () between the front faces, wherein the housing () includes a port flange () at each end of the cylinder drum () and at least at one end of the cylinder drum () a pressure shoe () is arranged between the cylinder drum () and the port flange of this end. Such a pressure exchanger should be operated in a cost-effective manner. To this end an adjustable stop arrangement () is arranged between the pressure shoe () and the cylinder drum ().

A hydraulic machine includes a first member () having a first structure () for a hydraulic medium opening in a first interface surface () and a second member having a second structure for the hydraulic medium opening in a second interface surface is described, the first interface surface () being in contact with the second interface surface, wherein at least one of the members () is provided with a support element () surrounding the member (). Such a machine should have a good efficiency. To this end the support element () has a strength varying in circumferential direction around the member () and/or in thickness direction in a middle region of the member ().

Hydraulic 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 having a first part () and a second part () moveable relative to said first part (), one of said first part () and said second part () having a first land () resting against the other one of said second part () and said first part (), having a predetermined first height (H), and being arranged between a high pressure area () and a low pressure area (). Such a machine should have a long working life. To this end a second land () having a predetermined second height (H) smaller than said first height (H) is located adjacent to said first land ().

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.

A vane cell machine () is described comprising a stator () and a rotor (), said rotor () having radially displaceable vanes () bearing on an inside () of the stator () and bordering, together with the rotor (), the stator (), and a side wall () at each axial end of the rotor (), work chambers () the volume of which changes during a rotation of said rotor, at least one side wall () bearing an insert in form of a ring (). Such a machine should be of simple construction. To this end, said ring () comprises a centric bore ().

Vane cell machine with centric bore in ring insert in side wall

A hydraulic machine arrangement () is described having a housing (), a working section and a hollow inside said housing (), a supply port arrangement LPin, HPin, LPout connected to said working area, and a leakage path () between said working section and said hollow. It should be possible to detect wear with simple means. To this end, said housing () is provided with a leakage port () connected to said hollow.

Hydraulic machine arrangement

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

Pump

The invention concerns a linear compressor, particularly a refrigerant compressor, with a housing (') and a compression unit, which comprises a compressor with a piston and a cylinder as well as a linear motor driving the piston in relation to the cylinder along a movement axis, the compression unit () being connected to the housing () via a spring arrangement (). It is endeavoured to provide a space saving support of the compression unit () in the housing that enables good vibration suppression. For this purpose, the spring arrangement comprises a spring (), which is curved in the circumferential direction in relation to the movement axis (), said spring surrounding the compression unit (-) on at least a share of its circumference.

Linear compressor with spring arrangement for vibration suppression

The invention concerns a valve arrangement for controlling a hydraulic drive, the supply to and the outflow from the hydraulic drive being separately controllable. It is endeavoured to realise separate controls of the speed and the hydraulic pressure of the hydraulic drive. For this purpose, a pump pipe is connected with a first control valve, the first control valve is connected through a pipe with a first working connection and a second working connection of the hydraulic drive, and the first working connection is connected with a second control valve and the second working connection is connected with a third control valve, the second control valve and the third control valve opening into a tank (T).

Valve arrangement and hydraulic drive

The invention concerns a valve arrangement for controlling a hydraulic drive, the supply and the outflow of the hydraulic drive being separately controllable. It is endeavoured to improve the valve arrangement in such a manner that it is intrinsically tight, at the same time having a relatively simple design. For this purpose, a pump pipe and a tank pipe are connected with a first control valve, the first control valve being connected by separate pipes with a second control valve and a third control valve connected in parallel with the second control valve, the second control valve being connected with a first working connection of the hydraulic drive and the third control valve being connected with a second working connection of the hydraulic drive, backflow preventers for preventing the flow from the hydraulic drive in the direction of the tank being connected in parallel with the second control valve and/or the third control valve.

The invention concerns a valve arrangement for controlling a hydraulic drive having a first working connection (A) and a second working connection (B), and being connectable with or separable from a pressure source (P), the supply and the outflow of the hydraulic drive being separately controllable. It is endeavoured to improve the energetic efficiency of the valve arrangement. For this purpose, the first working connection (A) is connected with a first control valve and the second working connection (B) is connected with a second control valve, the first and the second control valves being connected with each other and with a third control valve, which is connected with a tank.

The invention concerns a vehicle with an attachment, which has a lifting drive with at least one hydraulic cylinder and a control device, the control device having a position sensor and a position generator. It is endeavored to improve the position control of the attachment. For this purpose, the control device has a trajectory generator, which generates a trajectory in dependence of a desired position value and an acceleration limit, said trajectory being optimized with regard to a time specification, and a follower, which controls the lift drive in dependence of the trajectory.

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Aabenraa, Denmark

Poul Erik Hansen