Patents Assigned to Sihi GmbH & Co. KG
  • Patent number: 5800146
    Abstract: A liquid ring gas pump has a pressure space and a pressure pipe connected to the top of the pressure space. A tubular silencer is suspended from the pressure pipe and extends into the pressure space. The silencers are detachable and may be inserted through the pressure pipe. The detachable silencers are retained by an elastic ring retained in a ring-shaped groove of the pressure pipe.
    Type: Grant
    Filed: June 17, 1997
    Date of Patent: September 1, 1998
    Assignee: SIHI GmbH & Co. KG
    Inventors: Alfons Junemann, Gunther Struck
  • Patent number: 5775816
    Abstract: A device is proposed for centering a bearing bushing on a shaft wherein the bushing is made of a material, such as a ceramic, that is sensitive to tensile stress. At lower operating temperatures the bushing exhibits a degree of play relative to the shaft, but is play-free relative thereto at high operational temperatures. Correct centering of the bushing is ensured even in the higher temperature range by the provision of a pair of centering rings which are connected to the shaft without play and act on the bushing to center it. The centering rings are made of a material which, in comparison to the bushing, is not sensitive to tensile stress. It is expedient to provide the two centering rings at the end faces of the bushing. The clamping action of the centering rings on the bushing assures rotational pull of the bushing at low operating temperatures.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: July 7, 1998
    Assignee: Sihi GmbH & Co KG
    Inventors: Bodo Baranek, Ralf Mann, Rainer Landowski
  • Patent number: 5767635
    Abstract: In a displacement machine for compressible media having at least two rotors (14a-c) which are configured as profiled bodies and whose profiles engage with one another in the manner of gearwheels during rotation, the individual rotors are respectively driven by their own electric motors (9a-c) and are kept synchronous in rotational speed and angular position by electronic closed-loop and/or open-loop control units (1; 25a-c) in accordance with the transmission ratio of the displacer unit stage. The electronics can be employed for monitoring further operating data of the pump and also for matching the pump output by changing rotational speed. It can also be used as an overload protection. The rotational speeds and rotational attitudes of the rotors are controlled individually and independently of one another, the required attitude values being specified to the individual control units (25a-c) by means of a main control unit (1).
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: June 16, 1998
    Assignee: SIHI GmbH & Co. KG
    Inventors: Ralf Steffens, Andreas Salmen
  • Patent number: 5735674
    Abstract: Liquid-ring gas pump with a working space containing an overhung impeller (17) and a connection casing (2) which is separated from the working space by a control plate (13). This casing contains, on one side of a hub space (11) suitable for the accommodation of a mechanical seal (12), an inlet space (5) and, on the other side, a discharge space (6). The discharge space is connected to the working space to allow the recirculation of recirculated liquid. The connection between the discharge space and the working space is passed via the hub space. The hole (19) connecting the discharge space to the hub space is expediently situated on an extension (18) of the discharge space (6), the said extension leading across to the side of the pump containing the inlet space.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: April 7, 1998
    Assignee: SIHI GmbH & Co KG
    Inventors: Klaus Domagalla, Udo Segebrecht
  • Patent number: 5549450
    Abstract: Centrifugal pump of the sectional-casing design, in which the casing sections (8, 9) each have a cylindrical casing shell and inner-wall parts (12-15) connected thereto in one piece. The casing shell of at least one casing section (8, 9) is composed of an outer, continuous shell part (24, 25) and of at least two separate inner shell parts (19-22) with respective associated inner-wall parts (12-15). The outer and the inner shell parts are expediently connected firmly to one another, especially by shrink bonding.
    Type: Grant
    Filed: March 16, 1995
    Date of Patent: August 27, 1996
    Assignee: Sihi GmbH & Co KG
    Inventors: Ralf Mann, Wilfried Lehmann, Hermann Muller
  • Patent number: 5509789
    Abstract: Single-stage liquid ring gas pump which can be flanged to a drive unit. The suction and delivery connections are disposed on a connection casing (3) which is to be connected to the drive unit. On the side of the connection casing remote from the drive are disposed a plate cam (4) and a working chamber casing (5) together with the impeller (14) rotating in the latter. The impeller sealingly cooperates on its open end face with the plate cam and on its largely closed end face (19) with an end wall (7) of the working chamber casing (5). The working chamber casing is in the form of a deep-drawn sheet metal part and has no medium connections. For the purpose of connection to the connection casing or the plate cam, it is provided with a radial connection flange (6). The transition from the cylindrical part to the connection flange (6) of the working chamber casing (5) is rounded on the inside such that the gap remaining between this rounding and the plate cam remains below a particular size.
    Type: Grant
    Filed: September 12, 1994
    Date of Patent: April 23, 1996
    Assignee: Sihi GmbH & Co KG
    Inventors: Udo Segebrecht, Klaus Domagalla
  • Patent number: 5489195
    Abstract: Liquid-ring gas pump with a working chamber in which an impeller (6) rotates and which is bounded axially by a control plate (7) past which the impeller (6) moves with a small clearance and which has at least one intake and/or discharge opening (21, 22, 23) and is composed of rolled sheet. According to the invention, the edges (26) of the intake and discharge openings are at least in part bent over towards the side facing away from the impeller (6) and are rounded on the side facing the impeller and raised on the side facing away from it.
    Type: Grant
    Filed: September 21, 1994
    Date of Patent: February 6, 1996
    Assignee: SIHI GmbH & Co KG
    Inventors: Klaus Domagalla, Siegfried Auschrat
  • Patent number: 5456827
    Abstract: The auxiliary or working liquid is cleaned by being urged through a pervaporation membrane module (3), then the permeate stream from the membrane module is led through a condenser (4), where the impurities concentrated in the permeate stream precipitate. The stream of retentate and the stream of permeate from the membrane module are then fed back to a compressor (1). The differential pressure of the compressor belonging to the compressor system is used to operate this circuit.
    Type: Grant
    Filed: December 3, 1993
    Date of Patent: October 10, 1995
    Assignees: SIHI GmbH & Co KG, GKSS-Forschungszentrum Geesthacht GmbH
    Inventors: Karl-Heinz Nikutta, Dietmar Gosch, Erwin Zimmermann, Klaus Ohlrogge, Jan Wind, Klaus-Viktor Peinemann
  • Patent number: 5194074
    Abstract: A device for continuously purifying the waste gases from a vacuum unit using a gas permeation membrane. Reduced equipment and operating costs are achieved with good separation performance, by using a single pump to both remove the waste gas stream from the vacuum unit and to create a pressure difference across the gas permeation membrane. The vacuum pump is disposed downstream from the vacuum unit and upstream from the gas permeation meambrane. In addition to being connected to the vacuum unit, the suction side of the vacuum pump is also connected to the permeate side of the gas permeation membrane.
    Type: Grant
    Filed: August 6, 1991
    Date of Patent: March 16, 1993
    Assignee: Sihi GmbH & Co. KG
    Inventor: Gerhard Hauk
  • Patent number: 4979875
    Abstract: Centrifugal pump for the delivery of hot media, in particular of hot water with at least one shaft passage through the pump housing (1,2) to the outside, which passage is provided with a mechanical seal (5). The sealing space is separated from the pump housing by a spacer zone (8) with close shaft play. For the avoidance of sealing disturbances by accumulated gas, the sealing space contains first means (12, 20, 21) for the generation of a liquid circulation in the sealing space with intensive impingement of the sliding surface area of the mechanical seal, second means (12, 18,21) for the stabilization of the liquid circulation away from the mechanical seal and thirdly a large-volume, flow-stabilized, ventable receiving space for separated gas. The gas fractions are thereby reliably isolated from the mechanical seal, separated from the liquid circulation and accumulate in the upper region of the sealing space, so that they are extracted from the liquid circulation and can be drawn off.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: December 25, 1990
    Assignee: Sihi GmbH & Co. KG
    Inventors: Hermann Muller, Wilfried Lehmann, Ralf Mann
  • Patent number: 4710105
    Abstract: Fluid-ring compressor unit having a horizontal shaft and a compressor housing in which, subsequent to the compressor stage, a pressure chamber is made in connection with a pressure connecting piece. The pressure chamber is divided up by a wall, which projects upward at least up to the level of the pressure opening of the compressor stage, into a first area and a second area which are connected to one another above the wall while forming a route for the delivered medium, the second area of which is connected to the pressure connecting piece. The necessity of a separate fluid separator is avoided according to the invention by the pressure chamber being designed as a fluid separator. For this purpose, the route for the delivered medium, in the upper area of the pressure chamber, is equipped with a plurality of deflection portions and/or baffle surfaces which also block off the pressure connecting piece arranged at the top from the pressure opening.
    Type: Grant
    Filed: February 13, 1986
    Date of Patent: December 1, 1987
    Assignee: Sihi GmbH & Co. KG
    Inventors: Udo Segebrecht, Siegfried Auschrat
  • Patent number: 4685865
    Abstract: The invention relates to a liquid ring compressor in which only one central emptying opening is provided to the outside per compressor stage. It is ensured by means of appropriate connections of the chambers pertaining to each compressor stage that the entire auxiliary/operating liquid can flow out of the compressor through the central emptying opening (s) when the compressor is stopped.
    Type: Grant
    Filed: July 24, 1985
    Date of Patent: August 11, 1987
    Assignee: Sihi GmbH & Co. KG
    Inventor: Siegfried Auschrat
  • Patent number: 4634348
    Abstract: In a liquid ring compressor, the erosion and cavitation damage occurring under certain operating conditions is avoided by adding air or gas from the outside, at a pressure which approximately corresponds to the compression pressure, into particular pressure slot areas.
    Type: Grant
    Filed: September 30, 1985
    Date of Patent: January 6, 1987
    Assignee: Sihi GmbH & Co. KG
    Inventor: Siegfried Auschrat
  • Patent number: 4632649
    Abstract: A gas jet pump having a housing and a mixing nozzle holder which, in the area of their flange connection, form a mounting for a mixing nozzle. The mounting comprises on the one hand a clamping groove formed by both flanges in their parting plane, and on the other hand an annular groove in the periphery of the mixing nozzle and a ring made of elastic material located in both grooves. This secures both the axial position of the mixing nozzle relative to the housing and also the sealing.
    Type: Grant
    Filed: July 23, 1985
    Date of Patent: December 30, 1986
    Assignee: Sihi GmbH & Co. KG
    Inventors: Udo Segebrecht, Siegfried Auschrat
  • Patent number: 4390317
    Abstract: The invention relates to a centrifugal pump having a first centrifugal pump stage (2), which is located on the suction side and is not self-priming, and having a pump inlet nozzle (6), which is located axially at the level of the horizontal shaft (1), and having at least one centrifugal pump stage (3). which is located downstream and which, operating with the aid of auxiliary liquid, is self-priming. According to the invention, the self-priming capability and reliability of the pump, in particular for conveying media in the vicinity of their boiling point, are improved by arranging a liquid reservoir (13), of sufficient size, between two pump stages, the connection from this reservoir to the preceding centrifugal pump stage being located in the geodetically upper portion of the reservoir, and a seal (16) for closing the shaft clearance being located between the liquid reservoir (13) and the preceding centrifugal pump stage.
    Type: Grant
    Filed: July 31, 1981
    Date of Patent: June 28, 1983
    Assignee: Sihi GmbH & Co. KG
    Inventors: Wilfried Lehmann, Peter Fandrey
  • Patent number: 4256436
    Abstract: The invention relates to a self-priming centrifugal pump that consists of at least one fully-loaded pump or turbine stage with a horizontal shaft and one priming or ventilator stage that is fixed to the same shaft outside the main delivery stream, in the form of a lateral channel or liquid ring pump. In certain specific applications there is no flow through the ventilator stage during normal operation of the pump, and for this reason the ventilator stage is not cooled. The ventilator stage is cooled by virtue of the fact that the suction side of this stage is not only connected to the suction area of the fully loaded turbine stage, in which the gases that are to be removed usually collect, but is also connected to the pressure side of the pump, so that during normal operation a stream of liquid that has a cooling action is formed, and this passes by the suction opening of the ventilator stage.
    Type: Grant
    Filed: December 22, 1978
    Date of Patent: March 17, 1981
    Assignee: SIHI GmbH & Co. KG
    Inventors: Peter Fandrey, Hermann Muller
  • Patent number: 4230438
    Abstract: A rotary pump assembly including a pump having a pump housing, a pump shaft disposed within the pump housing, a runner mounted concentrically on the pump shaft, a motor having a motor housing, and an intermediate housing interconnected between the pump- and motor-housings. The pump shaft has an end facing the motor, and the pump shaft end is formed as a hollow shaft fittingly mounted on the motor shaft. A bearing support is disposed in the intermediate housing for supporting the hollow pump shaft end, and is formed as an axial bearing with substantially no radial bearing capacity.
    Type: Grant
    Filed: May 2, 1979
    Date of Patent: October 28, 1980
    Assignee: Sihi GmbH & Co. KG
    Inventors: Wilfried Lehmann, Hermann Muller, Bodo Baranek