Patents by Inventor Davor Kriz
Davor Kriz 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: 8783283Abstract: In accordance with the present invention, there is provided a valve assembly wherein a heating modality such as an induction heater is cooperatively engaged to a prescribed location on a valve housing or body of a valve to effectively maintain the temperature of the valve above the saturation temperature of the related system pressure. Maintaining this temperature differential effectively avoids the accumulation of condensate within the interior of the valve body and/or on other internal structural features thereof.Type: GrantFiled: January 31, 2012Date of Patent: July 22, 2014Assignee: Control Components, Inc.Inventors: Davor Kriz, Tobias Zieger, Peter Baumann, Muhamed Murati
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Patent number: 8702376Abstract: The disclosure relates to a radially fed axial steam turbine with a cold inlet duct, axially displaced from a hot inlet duct such that is it further away from a first blade row than the hot inlet duct. The cold inlet duct receives a cold steam from a cold inlet spiral and directs it into the hot inlet duct in such a way that a boundary layer of cold steam is formed over the rotor circumferential surface between the outlet end of the cold inlet duct and the blade and vane rows. The rotor circumferential surface is also adapted to promote and maintain the boundary layer. In this way, a maximum temperature to which the rotor is exposed can be reduced.Type: GrantFiled: October 12, 2010Date of Patent: April 22, 2014Assignee: Alstom Technology Ltd.Inventors: Thomas Mokulys, Vishal Borikar, Giorgio Zanazzi, Davor Kriz, Ludwig Boxheimer, Luca Ripamonti
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Patent number: 8684663Abstract: A steam turbine is provided having a relief groove which is arranged in the region of the equalizing piston and extends in the circumferential direction of the rotor. The relief groove, with regard to an inlet passage, is arranged in the axial upstream direction so that it is arranged on the rotor outside a region in which the steam flow enters the bladed flow path via the inlet passage. The relief groove, with regard to the first blade row, is arranged in a region in which the greatest thermal stresses can arise in the rotor. As an option, the relief groove has a cover for reducing vortex flows, and also devices for reducing heating of the groove or devices for active cooling. The steam turbine allows an increased number of risk-free running up and running down operations of the steam turbine with minimum detriment to the turbine performance.Type: GrantFiled: September 29, 2010Date of Patent: April 1, 2014Assignee: Alstom Technology Ltd.Inventors: Rabiye Bekyigit, Philipp Brunner, Jian Chen, Rolf Dobler, Jozo Drmic, Andreas Ehrsam, Maurus Herzog, Davor Kriz, Thomas Mokulys, Martin Reigl, Luca Ripamonti, Thomas Schreier, Giorgio Zanazzi
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Publication number: 20130192677Abstract: In accordance with the present invention, there is provided a valve assembly wherein a heating modality such as an induction heater is cooperatively engaged to a prescribed location on a valve housing or body of a valve to effectively maintain the temperature of the valve above the saturation temperature of the related system pressure. Maintaining this temperature differential effectively avoids the accumulation of condensate within the interior of the valve body and/or on other internal structural features thereof.Type: ApplicationFiled: January 31, 2012Publication date: August 1, 2013Inventors: Davor Kriz, Tobias Zieger, Peter Baumann, Muhamed Murati
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Patent number: 8454306Abstract: A steam turbine (10), especially for the high-pressure range or intermediate-pressure range, includes a rotor (11) which is rotatably mounted around an axis and concentrically enclosed at a distance by an inner casing (12), wherein between the rotor (11) and the inner casing (12) a flow passage (13) is formed, which on the inlet side is axially delimited by a balance piston (18) which is arranged on the rotor (11), and into which flow passage rotor blades (15) and stator blades (17), alternating in the direction of flow, radially project, and wherein, at the entry of the flow passage (13), an inlet scroll (14), through which steam is guided from the outside radially inwards and deflected in a deflection region (27) in the axial direction to the inlet of the flow passage (13), is formed on the inner casing (12).Type: GrantFiled: November 20, 2009Date of Patent: June 4, 2013Assignee: ALSTOM Technology Ltd.Inventors: Thomas Mokulys, Vishal Borikar, Giorgio Zanazzi, Davor Kriz, Hans-Ludwig Boxheimer, Luca Ripamonti, Maurus Herzog, Martin Reigl, Rolf Doebler, Jozo Drmic, Jian Chen, Rabiye Bekyigit
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Publication number: 20110103970Abstract: A steam turbine is provided having a relief groove which is arranged in the region of the equalizing piston and extends in the circumferential direction of the rotor. The relief groove, with regard to an inlet passage, is arranged in the axial upstream direction so that it is arranged on the rotor outside a region in which the steam flow enters the bladed flow path via the inlet passage. The relief groove, with regard to the first blade row, is arranged in a region in which the greatest thermal stresses can arise in the rotor. As an option, the relief groove has a cover for reducing vortex flows, and also devices for reducing heating of the groove or devices for active cooling. The steam turbine allows an increased number of risk-free running up and running down operations of the steam turbine with minimum detriment to the turbine performance.Type: ApplicationFiled: September 29, 2010Publication date: May 5, 2011Applicant: ALSTOM TECHNOLOGY LTDInventors: Rabiye BEKYIGIT, Philipp BRUNNER, Jian CHEN, Rolf DÖBLER, Jozo DRMIC, Andreas EHRSAM, Maurus HERZOG, Davor KRIZ, Thomas MOKULYS, Martin REIGL, Luca RIPAMONTI, Thomas SCHREIER, Giorgio ZANAZZI
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Publication number: 20110085887Abstract: The disclosure relates to a radially fed axial steam turbine with a cold inlet duct, axially displaced from a hot inlet duct such that is it further away from a first blade row than the hot inlet duct. The cold inlet duct receives a cold steam from a cold inlet spiral and directs it into the hot inlet duct in such a way that a boundary layer of cold steam is formed over the rotor circumferential surface between the outlet end of the cold inlet duct and the blade and vane rows. The rotor circumferential surface is also adapted to promote and maintain the boundary layer. In this way, a maximum temperature to which the rotor is exposed can be reduced.Type: ApplicationFiled: October 12, 2010Publication date: April 14, 2011Applicant: ALSTOM Technology LtdInventors: Thomas MOKULYS, Vishal Borikar, Giorgio Zanazzi, Davor Kriz, Ludwig Boxheimer, Luca Ripamonti
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Publication number: 20100129207Abstract: A steam turbine (10), especially for the high-pressure range or intermediate-pressure range, includes a rotor (11) which is rotatably mounted around an axis and concentrically enclosed at a distance by an inner casing (12), wherein between the rotor (11) and the inner casing (12) a flow passage (13) is formed, which on the inlet side is axially delimited by a balance piston (18) which is arranged on the rotor (11), and into which flow passage rotor blades (15) and stator blades (17), alternating in the direction of flow, radially project, and wherein, at the entry of the flow passage (13), an inlet scroll (14), through which steam is guided from the outside radially inwards and deflected in a deflection region (27) in the axial direction to the inlet of the flow passage (13), is formed on the inner casing (12).Type: ApplicationFiled: November 20, 2009Publication date: May 27, 2010Inventors: Thomas Mokulys, Vishal Borikar, Giorgio Zanazzi, Davor Kriz, Hans-Ludwig Boxheimer, Luca Ripamonti, Maurus Herzog, Martin Reigl, Rolf Doebler, Jozo Drmic, Jian Chen, Rabiye Bekyigit
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Patent number: 7681601Abstract: An inner casing (10) of a rotating thermal machine, in particular a steam turbine, has essentially the form of a hollow cylinder and is divided in a parting plane (20), which extends through an axis (11) of said casing, into a lower casing part (12) and an upper casing part (13), which casing parts (12, 13) are detachably connected to one another in the parting plane (20).Type: GrantFiled: August 11, 2006Date of Patent: March 23, 2010Assignee: ALSTOM Technology Ltd.Inventor: Davor Kriz
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Patent number: 7594795Abstract: The invention relates to a steam turbine, in particular for a power plant, comprising an outer casing, an inner casing arranged in the outer casing, and a plurality of guide blade rows. In order to reduce leakage flows in the inner casing, a blade ring is provided, which is arranged in the inner casing and in which at least some of the guide blade rows are arranged.Type: GrantFiled: June 13, 2006Date of Patent: September 29, 2009Assignee: Alstom Technology LtdInventors: Davor Kriz, Philip John Peel
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Patent number: 7402024Abstract: A steam turbine (20), in particular for high pressure and/or intermediate pressure applications, has a rotor (11), which can rotate about an axis (23), an inner casing (14), which concentrically surrounds the rotor (11) at a distance, so as to form an annular passage (12) extending in the axial direction, and an outer casing (13), which concentrically surrounds the inner casing (14) at a distance so as to form an annular intermediate space (16) extending in the axial direction, blading including rotor blades (21) and guide vanes (22) being provided in the annular passage (12), and the annular passage (12), on the outlet side, being in communication with the intermediate space (16) in order for the steam to be passed on, and the inner casing (14) also being externally surrounded by a plurality of shrink rings (15), which are arranged one behind the other in the axial direction and project into the intermediate space (16).Type: GrantFiled: February 6, 2006Date of Patent: July 22, 2008Assignee: ALSTOM Technology Ltd.Inventors: Davor Kriz, Peter John Walker
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Publication number: 20070207031Abstract: A steam turbine (20), in particular for high pressure and/or intermediate pressure applications, has a rotor (11), which can rotate about an axis (23), an inner casing (14), which concentrically surrounds the rotor (11) at a distance, so as to form an annular passage (12) extending in the axial direction, and an outer casing (13), which concentrically surrounds the inner casing (14) at a distance so as to form an annular intermediate space (16) extending in the axial direction, blading including rotor blades (21) and guide vanes (22) being provided in the annular passage (12), and the annular passage (12), on the outlet side, being in communication with the intermediate space (16) in order for the steam to be passed on, and the inner casing (14) also being externally surrounded by a plurality of shrink rings (15), which are arranged one behind the other in the axial direction and project into the intermediate space (16).Type: ApplicationFiled: February 6, 2006Publication date: September 6, 2007Inventors: Davor Kriz, Peter Walker
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Publication number: 20070044860Abstract: An inner casing (10) of a rotating thermal machine, in particular a steam turbine, has essentially the form of a hollow cylinder and is divided in a parting plane (20), which extends through an axis (11) of said casing, into a lower casing part (12) and an upper casing part (13), which casing parts (12, 13) are detachably connected to one another in the parting plane (20).Type: ApplicationFiled: August 11, 2006Publication date: March 1, 2007Inventor: Davor Kriz
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Publication number: 20060292003Abstract: The invention relates to a steam turbine, in particular for a power plant, comprising an outer casing, an inner casing arranged in the outer casing, and a plurality of guide blade rows. In order to reduce leakage flows in the inner casing, a blade ring is provided, which is arranged in the inner casing and in which at least some of the guide blade rows are arranged.Type: ApplicationFiled: June 13, 2006Publication date: December 28, 2006Applicant: ALSTOM Technology LtdInventors: Davor Kriz, Philip Peel