Patents by Inventor Stefan Dahlke
Stefan Dahlke has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11929685Abstract: A voltage source converter has a half bridge (18) with two current valves (19, 20) connected in series and an arrangement configured to carry out voltage measurements for determining a value of the DC voltage between opposite poles (21, 22) of a DC side of the converter. Each current valve comprises a semiconductor device (23, 24) controlled by an associated gate drive member (29, 30), each forming gate drive parts of one gate drive unit (28) in common to both current valves. The gate drive unit (28) comprises an isolated two-way communication link (33) between the gate drive members. The arrangement is included in the gate drive unit and configured to measure the entire DC voltage between said opposite poles (21, 22). A converter control device (31) calculates and sends control signals to the gate drive unit based on the result of the voltage measurement.Type: GrantFiled: November 7, 2019Date of Patent: March 12, 2024Assignee: BOMBARDIER TRANSPORTATION GMBHInventors: Andreas Löfgren, Johan Dahlke, Stefan Roth
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Publication number: 20190078443Abstract: A film-cooling hole of gas turbine components to be cooled has an inflow section which has a constant throughflow cross section and which is adjoined by a diffuser section which has a varying throughflow cross section. The widening of the diffuser region occurs only in the direction which is perpendicular to the flow direction of the relatively hot medium.Type: ApplicationFiled: March 22, 2017Publication date: March 14, 2019Applicant: Siemens AktiengesellschaftInventors: Thomas Beck, Stefan Dahlke, Jens Dietrich, Sebastian Hohenstein
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Patent number: 9915150Abstract: A turbine blade for a turbomachine having a turbine blade wall and a fluid channel having inlet channel section on the end region leading to the cold side, outlet channel section on the end region leading to the hot side, and central channel section therebetween having a circular cross-section constant along the length. The turbine blade forms an acute angle with the surface of the turbine blade wall over which hot gas flows, and has an intermediate channel section between the inlet and central channel sections, the intermediate channel section having a larger cross-sectional area than the central channel section. The central channel section connects to the intermediate channel section forming a shoulder surface formed on a wall region of the fluid channel and, on the opposing wall region, the intermediate and central channel sections merge with one another in a linear manner with a reduced shoulder height.Type: GrantFiled: August 21, 2015Date of Patent: March 13, 2018Assignee: Siemens AktiengesellschaftInventors: Stefan Dahlke, Tilman Auf dem Kampe, Marc Fraas
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Publication number: 20170268347Abstract: A turbine blade for a turbomachine having a turbine blade wall and a fluid channel having inlet channel section on the end region leading to the cold side, outlet channel section on the end region leading to the hot side, and central channel section therebetween having a circular cross-section constant along the length. The turbine blade forms an acute angle with the surface of the turbine blade wall over which hot gas flows, and has an intermediate channel section between the inlet and central channel sections, the intermediate channel section having a larger cross-sectional area than the central channel section. The central channel section connects to the intermediate channel section forming a shoulder surface formed on a wall region of the fluid channel and, on the opposing wall region, the intermediate and central channel sections merge with one another in a linear manner with a reduced shoulder height.Type: ApplicationFiled: August 21, 2015Publication date: September 21, 2017Applicant: Siemens AktiengesellschaftInventors: Stefan Dahlke, Tilman Auf dem Kampe, Marc Fraas
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Publication number: 20140367925Abstract: A hot gas seal for sealing an opening in a heat shield element or between heat shield elements of a heat shield includes a resilient portion for providing a force which is designed such that the hot gas seal can be held in the opening by the force and/or that the sealing efficiency of the hot gas seal is increased by the force. Further, a hot gas seal assembly for sealing an opening in a heat shield element or between heat shield elements of a heat shield against a hot gas is provided, the assembly including a sealing body and a further sealing element which is in a solid state at room temperature and in a high viscosity liquid state at a temperature of the hot gas.Type: ApplicationFiled: February 19, 2014Publication date: December 18, 2014Inventors: Stefan Dahlke, Jesse Eng, John Carl Glessner, Daniel Hofmann, Kenneth Michael Tamaddoni-Jahromi
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Patent number: 8695989Abstract: An inventive hot gas seal for sealing an opening, e.g. a gap or hole, in a heat shield element or between heat shield elements of a heat shield or a liner comprises at least one resilient portion for providing a force which is designed such that the hot gas seal can be held in said opening by said force and/or that the sealing efficiency of the hot gas seal is increased by said force. Thus, further means for holding the seal in place and/or for increasing the sealing efficiency are not necessary. The invention is particularly useful if the design of said resilient portion is such that the force provides a holding action and increases the sealing efficiency, at the same time.Type: GrantFiled: April 30, 2004Date of Patent: April 15, 2014Assignee: Siemens AktiengesellschaftInventors: Stefan Dahlke, Jesse Eng, John Carl Glessner, Daniel Hofmann, Roland Liebe, Kenneth Michael Tamaddoni-Jahromi
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Patent number: 8635876Abstract: Disclosed is a gas turbine for a thermal power plant, especially a gas turbine, comprising a rotatable rotor and a duct which can be penetrated by a gas and in which turbine blades for driving the rotor are disposed. The inventive gas turbine is characterized by a blocking device which at least partially prevents the gas from penetrating the duct in a closed position.Type: GrantFiled: February 28, 2007Date of Patent: January 28, 2014Assignee: Siemens AktiengesellschaftInventors: Hajrudin Ceric, Stefan Dahlke, Uwe Gruschka, Matthias Heue, Martin Lenze, Thomas Matern, Dieter Minninger, Axel Schaberg, Stephan Schmidt, Steffen Skreba, Bernd Stöcker, Volker Vosberg, Roger Waldinger
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Publication number: 20120198362Abstract: In a method for automatically identifying at least one control element in an application view of an application a) at least one recognition pattern for structural and/or graphical features of the at least one control element is pre-stored in an object template, b) a recognition means generates structural and/or graphical data from the application view and examines the data according to the at least one recognition pattern, c) in dependence on the examination a measure for the recognition certainty of the at least one recognition pattern is determined, and d) in dependence on the obtained recognition certainty the status of the at least one control element is determined as “identified” or “not identified”.Type: ApplicationFiled: June 11, 2009Publication date: August 2, 2012Applicant: DATANGO AGInventors: Matthias Urban, Vikas Kapoor, Stefan Dahlke, Jochen Wiechen
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Patent number: 7849694Abstract: The invention relates to a heat shield arrangement for a hot gas (m)-guiding component, which comprises a number of heat shield elements arranged side-by-side on a supporting structure while leaving a gap there between. A heat shield element can be mounted on the supporting structure whereby forming an interior space which is delimited in areas by a hot gas wall to be cooled, with an inlet channel for admitting a coolant into the interior space. According to the invention, a coolant discharge channel is provided for the controlled discharge of coolant from the interior space and, from the interior space, leads into the gap. Coolant can be saved and efficiently used by the specific coolant discharge via the coolant discharge channel, and reduction in pollutant emissions can also be achieved. The heat shield arrangement is particularly suited for linking a combustion chamber of a gas turbine.Type: GrantFiled: July 20, 2004Date of Patent: December 14, 2010Assignee: Siemens AktiengesellschaftInventors: Stefan Dahlke, Heinrich Pütz
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Publication number: 20090293491Abstract: Disclosed is a gas turbine for a thermal power plant, especially a gas turbine, comprising a rotatable rotor and a duct which can be penetrated by a gas and in which turbine blades for driving the rotor are disposed. The inventive gas turbine is characterized by a blocking device which at least partially prevents the gas from penetrating the duct in a closed position.Type: ApplicationFiled: February 28, 2007Publication date: December 3, 2009Inventors: Hajrudin Ceric, Stefan Dahlke, Uwe Gruschka, Matthias Heue, Martin Lenze, Thomas Matern, Dieter Minninger, Axel Schaberg, Stephan Schmidt, Steffen Skreba, Bernd Stöcker, Volker Vosberg, Roger Waldinger
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Publication number: 20090077974Abstract: The invention relates to a heat shield arrangement for a hot gas (m)-guiding component, which comprises a number of heat shield elements arranged side-by-side on a supporting structure while leaving a gap there between. A heat shield element can be mounted on the supporting structure whereby forming an interior space which is delimited in areas by a hot gas wall to be cooled, with an inlet channel for admitting a coolant into the interior space. According to the invention, a coolant discharge channel is provided for the controlled discharge of coolant from the interior space and, from the interior space, leads into the gap. Coolant can be saved and efficiently used by the specific coolant discharge via the coolant discharge channel, and reduction in pollutant emissions can also be achieved. The heat shield arrangement is particularly suited for linking a combustion chamber of a gas turbine.Type: ApplicationFiled: July 20, 2004Publication date: March 26, 2009Inventors: Stefan Dahlke, Heinrich Putz
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Patent number: 7334960Abstract: An attachment device for coupling one or more removable turbine components to a carrier of a turbine engine. The attachment device may include a securement structure rotatable about an axis of rotation and including one or more arms for grasping an arm extending from a support structure. A fastener may extend from the support structure and be inserted into a fastener receiving recess in the securement structure for preventing the securement structure from rotating and becoming disengaged from the support structure. The attachment device may also include a fastener retaining device for preventing the fastener, which may be a threaded bolt, from becoming disengaged from the attachment device, traveling downstream in a turbine, and damaging a turbine assembly.Type: GrantFiled: June 23, 2005Date of Patent: February 26, 2008Assignee: Siemens Power Generation, Inc.Inventors: John C. Glessner, Stefan Dahlke, Robert O. Nicosia, Ricardo F. Moraes
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Publication number: 20070245742Abstract: There is described a method for cooling and sealing of a heat shield element, comprising a main wall with an inner side, which is restricted by side walls or rims, and an outer side, which can be exposed to a hot fluid, and wherein a coolant is introduced into an impingement region of that heat shield element and an impingement flow of said coolant is directed on a surface area of that inner side through a plurality of impingement holes, effecting an impingement pressure drop. In the method discharge flow is metered through a number of discharge holes through said side wall or rims from the inner side to the outer side of the main wall, generating a discharge pressure drop in series with the impingement pressure drop. The impingement pressure drop and the discharge pressure drop are matched to one another so that a required coolant flow is generated which yields a required predetermined heat-transfer coefficient of the main wall.Type: ApplicationFiled: October 21, 2005Publication date: October 25, 2007Inventors: Stefan Dahlke, Uwe Gruschka, Andreas Heilos, Roland Liebe
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Publication number: 20070031188Abstract: An attachment device for coupling one or more removable turbine components to a carrier of a turbine engine. The attachment device may include a securement structure rotatable about an axis of rotation and including one or more arms for grasping an arm extending from a support structure. A fastener may extend from the support structure and be inserted into a fastener receiving recess in the securement structure for preventing the securement structure from rotating and becoming disengaged from the support structure. The attachment device may also include a fastener retaining device for preventing the fastener, which may be a threaded bolt, from becoming disengaged from the attachment device, traveling downstream in a turbine, and damaging a turbine assembly.Type: ApplicationFiled: June 23, 2005Publication date: February 8, 2007Inventors: John Glessner, Stefan Dahlke, Robert Nicosia, Ricardo Moraes
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Publication number: 20050242525Abstract: An inventive hot gas seal for sealing an opening, e.g. a gap or hole, in a heat shield element or between heat shield elements of a heat shield or a liner comprises at least one resilient portion for providing a force which is designed such that the hot gas seal can be held in said opening by said force and/or that the sealing efficiency of the hot gas seal is increased by said force. Thus, further means for holding the seal in place and/or for increasing the sealing efficiency are not necessary. The invention is particularly useful if the design of said resilient portion is such that the force provides a holding action and increases the sealing efficiency, at the same time.Type: ApplicationFiled: April 30, 2004Publication date: November 3, 2005Inventors: Stefan Dahlke, Jesse Eng, John Glessner, Daniel Hofmann, Roland Liebe, Kenneth Tamaddoni-Jahromi
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Publication number: 20050242526Abstract: An inventive hot gas seal comprises a sealing body and means for allowing a cooling fluid, preferably cooling air, to flow through the interior of the sealing body. Such a hot gas seal can be effectively cooled by guiding a cooling fluid through the interior of the sealing body.Type: ApplicationFiled: April 30, 2004Publication date: November 3, 2005Inventors: Stefan Dahlke, Jesse Eng, John Glessner, Daniel Hofmann, Roland Liebe, Kenneth Tamaddoni-Jahromi