Patents Assigned to Pfeiffer Vacuum GmbH
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Patent number: 8202072Abstract: A lubricant-tight vane rotary vacuum pump, includes a pump stage (17) having a pump stage housing (10) with a gas inlet, compression chamber (11), and a gas outlet (51), a channel (50) connecting the compression chamber (11) with the gas outlet (51), and a groove (54) at least partially surrounding a mouth of the connecting channel (50) that opens into the gas outlet (51), so that lubricant, which is tossed out of the compression chamber, is collected in the groove (54) and re-entry of the lubricant back into the compression chamber (11) is prevented.Type: GrantFiled: December 11, 2007Date of Patent: June 19, 2012Assignee: Pfeiffer Vacuum GmbHInventors: Thomas Schneider, Juergen Wagner
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Patent number: 8202005Abstract: A bearing module for supporting a rapidly rotatable shaft of a vacuum pump includes a rolling bearing for supporting rotatably the shaft, a reservoir for a lubricant having an element forming a sliding contact with a delivery structure supported on the shaft for delivery of the lubricant in the rolling bearing under action of centrifugal forces generated during rotation of the shaft, and a radial delivery element provided on a side of the rolling bearing opposite a side of the bearing at which the delivery structure is located, for returning the lubricant to the reservoir.Type: GrantFiled: November 9, 2007Date of Patent: June 19, 2012Assignee: Pfeiffer Vacuum GmbHInventors: Bernhard Koch, Joerg Stanzel
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Patent number: 8123412Abstract: A vacuum pump includes a high-speed rotor, and an anti-friction bearing for rotatably supporting the rotor and including an inner ring, an outer ring, a rolling body, and a cage for the rolling body both the rolling body and the cage being located in an intermediate space defined by the outer and inner rings, with the cage having a threaded groove in a section of its surface adjacent to the inner ring for insuring a continuous feeding of a lubricant to the bearing.Type: GrantFiled: March 20, 2008Date of Patent: February 28, 2012Assignee: Pfeiffer Vacuum GmbHInventor: Bernd Koci
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Patent number: 8070418Abstract: A vacuum pump includes a gas inlet, a quick-rotatable rotor connectable with a flange of a multi-chamber vacuum installation which flange has a plurality of suction openings separated by separation walls, and a gas path separating structure which is located in the gas inlet of the pump, dividing the gas inlet in suction regions, and which seals, together with the separation walls, chambers of the multi-chamber vacuum installation.Type: GrantFiled: September 19, 2008Date of Patent: December 6, 2011Assignee: Pfeiffer Vacuum GmbHInventor: Andeas Zipp
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Patent number: 7959423Abstract: A vacuum pump includes a quick-rotatable component a bearing for supporting the quick-rotatable component and a lubricant pump for feeding lubricant to the bearing and having a rotor, with the bearing and the lubricant pump forming parts of a closed lubrication circuit having a hollow axle on which the rotor of the lubricant pump is rotatably supported.Type: GrantFiled: November 12, 2008Date of Patent: June 14, 2011Assignee: Pfeiffer Vacuum GmbHInventors: Martin Eilers, Michael Willig
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Patent number: 7854601Abstract: A lubricant-tight vane rotary vacuum pump includes at least one pump stage (17, 18) having a safety valve (3) for controlling gas flow to the pump stage, a lubricant pump, a lubricant reservoir (30) at least partially surrounding the pump stage housing (10, 40), and a hydraulic conduit (31) connecting the lubricant pump outlet (22) with the safety valve (3), with a pressurized lubricant flow through the hydraulic conduit (31) opening the safety valve (3), and a channel (32) branching from the hydraulic conduit (31) for delivering a pressurized lubricant into the lubricant reservoir (30).Type: GrantFiled: December 12, 2007Date of Patent: December 21, 2010Assignee: Pfeiffer Vacuum GmbHInventor: Juergen Wagner
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Patent number: 7828512Abstract: An arrangement for supporting a shaft of a vacuum pump includes a first bearing for supporting the shaft at one of its end, a second bearing for supporting the shaft at another of its ends and formed as a rolling bearing, a holder for receiving the second bearing and including an oscillating base, a fixation member secured in the vacuum pump housing, metallic connection members for connecting the oscillating base with the fixation member and axial springs arranged between the oscillating base and the fixation member and providing for the axial stiffness of the holder which is greater than its radial stiffness thereof and greater than the axial stiffness of the first bearing.Type: GrantFiled: August 6, 2007Date of Patent: November 9, 2010Assignee: Pfeiffer Vacuum GmbHInventors: Martin Eilers, Andreas Rippl, Christopher-Mark Rippl, Tobias Stoll
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Patent number: 7669516Abstract: A sealing arrangement which is designed for a cylinder-piston arrangement of a reciprocating piston vacuum pump for sealing a gap between a cylinder wall and a piston displaceable in the cylinder, includes at least one L-shaped annular seal having one of its leg secured on the piston for providing a static sealing, and its another free leg adjoining the cylinder wall for providing a dynamic sealing, and an annular guide member arranged on the piston between the piston and the cylinder on a side of the seal remote from a compression chamber of the pump.Type: GrantFiled: March 15, 2007Date of Patent: March 2, 2010Assignee: Pfeiffer Vacuum GmbHInventors: Thomas Cromm, Ronald Sachs, Stefan Zabeschek
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Patent number: 7575372Abstract: A device for contactless measurement of a rotor temperature includes a magnet supported on the rotor, electric coils which are arranged at the stator with which the rotor cooperates, and an electronic unit for measuring a voltage induced in the coil and including a component that converts the measured voltage into a temperature-proportional signal.Type: GrantFiled: November 16, 2006Date of Patent: August 18, 2009Assignee: Pfeiffer Vacuum GmbHInventor: Armin Conrad
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Patent number: 7500821Abstract: A vacuum pump including a tempering component arrangeable between the suction side flange of the pump and the connection flange of a recipient and having a tempering element.Type: GrantFiled: February 4, 2004Date of Patent: March 10, 2009Assignee: Pfeiffer Vacuum GmbHInventor: Robert Watz
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Publication number: 20090050289Abstract: The invention relates to an improved vacuum die-casting, in particular for metals and metal alloys which contain Al, Mg, Zn, and Cu. In order to improve the quality of the components, it is proposed to produce vacuum in the mold cavity and the casting chamber cavity in several phases of the die-casting process. The use of the new method is contemplated for both cold-chamber and hot-chamber die-casting.Type: ApplicationFiled: November 23, 2005Publication date: February 26, 2009Applicant: PFEIFFER VACUUM GMBHInventor: Hedwig Lismont
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Patent number: 7378815Abstract: A device for redundant speed monitoring of a synchronous motor, which is sine-commutated without the use of sensors and which has a permanently magnetically excited rotor, has a first control unit, a drive output stage, a plurality of drive phases, and a second control unit for monitoring an electrical value of at least one of the drive phases and connected to the drive output stage for turning off the drive output stage when an improper speed state is detected.Type: GrantFiled: September 15, 2006Date of Patent: May 27, 2008Assignee: Pfeiffer Vacuum GmbHInventors: Wolfgang Losch, André Mueller
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Patent number: 7367429Abstract: A device for feeding oil to a seat of a bearing (5) that supports a rotatable shaft (3) includes an annular oil reservoir (14) surrounding a seat of the bearing (5), an oil pump (8) having two spindles (10, 11) with oppositely extending, respectively feeding channels, oil delivery conduit means (20); and oil return conduit (24, 25, 26, 27) provided on axially opposite sides of the bearing seat.Type: GrantFiled: May 6, 2004Date of Patent: May 6, 2008Assignee: Pfeiffer Vacuum GmbHInventors: Armin Blecker, Heinrich Lotz
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Patent number: 7241120Abstract: A piston machine includes a cylindrical wall (2) defining a swept volume (1) and having a plurality of gas inlet openings (5), and a piston (3) reciprocating in the swept volume (1), and the piston head (12) of which is formed as a valve having a plurality of openings (14) provided in the piston head (12), and a forcelocking device (16, 21; 18, 24) for retaining the plurality of openings (14) in one of their open condition and closed condition.Type: GrantFiled: October 8, 2003Date of Patent: July 10, 2007Assignee: Pfeiffer Vacuum GmbHInventors: Eckard Bez, Thorsten Burggraf, Stefan Zabeschek
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Patent number: 7226276Abstract: A multi-stage reciprocating vacuum pump includes first (2) and second (4) pump chambers located in the pump housing (1) and in which respective pistons (6, 8) reciprocate, first and second conduits (14, 20) for communicating, respectively outlet and suction (15, 16) sides of the first pump chamber (2) with the suction side (17) of the second pump chamber (4), and shut-off elements (18, 21; 25) associated with the first and second conduits (14, 20) for selectively communicating the first and second conduits (14, 20) with the suction side (17) of the second pump chamber (4); and the method of operating the pump includes manipulating the shut-off elements so that the first and second conduits (14, 20) are selectively connected to the suction side (17) of the second pump chamber (4).Type: GrantFiled: October 21, 2003Date of Patent: June 5, 2007Assignee: Pfeiffer Vacuum GmbHInventors: Eckhard Bez, Stefan Zabeschek
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Patent number: 7192262Abstract: A twin-shaft vacuum pump includes two shafts and two rotors supported on respective shafts and cooperating with each other for producing a pumping effect, with each rotor being formed of a plurality of discoid components.Type: GrantFiled: January 6, 2004Date of Patent: March 20, 2007Assignee: Pfeiffer Vacuum GmbHInventors: Christopher-Mark Rippl, Juergen Wagner
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Patent number: 7059828Abstract: A gas friction pump, comprising stationary pump-active components (14) and rotatable pump-active components (15) secured on a rotatable rotor shaft (4), wherein the rotor shaft is supported with a bearing (5) at the high-vacuum-side end and a bearing arrangement at a fore-vacuum side end, characterized in that the high-vacuum side bearing is formed as a conventional bearing, and the fore-vacuum bearing arrangement contains at least one gas bearing. In an advantageous embodiment, the gas bearing is formed as a module and can be brought in engagement with a cylindrical portion of the housing and secured therein.Type: GrantFiled: February 5, 2004Date of Patent: June 13, 2006Assignee: Pfeiffer Vacuum GmbHInventors: Armin Conrad, Jörg Stanzel
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Patent number: 7036792Abstract: A valve arrangement for a vacuum pump includes a valve head displaceable substantially perpendicular to a flow direction of a fluid through the valve arrangement, a valve seat, and a valve spring for biasing the valve head into a flat abutment engagement with the valve seat, with the valve spring being formed of at least one substantially hollow body made of an elastomeric material.Type: GrantFiled: September 24, 2003Date of Patent: May 2, 2006Assignee: Pfeiffer Vacuum GmbHInventors: Eckhard Bez, Stefan Zabeschek
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Patent number: 7015609Abstract: A machine, having a high-speed rotor, and stationary components having connection surfaces for connecting the machine with external components and/or the stationary components with each other and provided with outer surface layers having a high friction coefficient.Type: GrantFiled: February 20, 2003Date of Patent: March 21, 2006Assignee: Pfeiffer Vacuum GmbHInventor: Peter Fahrenbach
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Patent number: 6991424Abstract: A gas friction pump includes stationary (6) and rotatable (5) pump-active elements secured on a rotor shaft (4) and forming with the rotor shaft components of the rotor, with the rotor shaft (4) being supported by two, spaced from each other, radial bearings (8, 9), of which one is located closer to the gravity center of the rotor than the other, and an axial bearing (16), and with the radial bearing (9), which is located closer to the gravity center of the rotor, being formed as a gas bearing, and another radial bearing (8) being formed as a non-gas bearing.Type: GrantFiled: February 5, 2004Date of Patent: January 31, 2006Assignee: Pfeiffer Vacuum GmbHInventors: Armin Conrad, Jörg Stanzel