Patents Assigned to Alfa Laval AB
  • Patent number: 7070553
    Abstract: In a method of rapidly lowering the rotary speed of a rotating rotor body in a centrifugal separator the lowering of the rotary speed is initiated, when a disturbing unbalance or vibrations have occurred. A space between the rotor body and a stationary casing which surrounds the rotor body is supplied with foam or with an aerosol of a liquid in a gas, when unbalance or vibrations over a certain level have occurred. The rotor body is retarded by the friction, which is obtained between the rotor body, the foam or aerosol and the casing. In an arrangement to lower the rotary speed of a rotating rotor body in a centrifugal separator the lowering is initiated when a disturbing unbalance or disturbing vibrations has occurred. At a certain unbalance or certain vibration level, a foam generating device or a device that creates an aerosol for the purpose of filling a space between the rotor body and a casing which surrounds the same with foam or aerosol is activated.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: July 4, 2006
    Assignee: Alfa Laval AB
    Inventor: Sven-Olof Nyberg
  • Patent number: 6976948
    Abstract: A method for adjusting an interface formed during operation between a specific light liquid phase and a specific heavier liquid phase to a wanted radial level in a centrifugal separator, in which the separation chamber is emptied of its contents and the inlet opening is brought to a radial inner position in the outlet chamber, after which a pre-determined volume of the specific heavier liquid phase is supplied to the separation chamber and the mixture of the two liquid phases is supplied to the separation chamber via the supply conduit and the inlet chamber whereby the separation chamber is filled up and an interface between the two liquid phases is formed, which is displaced radial outwardly, the displaced specific heavier liquid phase then being pressed radial inwardly in the outlet channel and further into the outlet chamber.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: December 20, 2005
    Assignee: Alfa Laval AB
    Inventor: Ervin Hamblad
  • Patent number: 6955637
    Abstract: In a separation device for separating particles from a liquid, which is present in a container, a centrifugal rotor is rotatable around a vertical rotational axis. The centrifugal rotor has a tubular inlet member, which extends down into liquid to be treated and which upon rotation of the centrifugal rotor forms a pumping member adapted to pump liquid upwardly and into the centrifugal rotor. The rotatable inlet member is surrounded by a non-rotatable wall, a sealing device being adapted to seal between the rotatable inlet member and the non-rotatable wall. Thereby is avoided that liquid is pumped upwardly on the outside of the inlet member. Furthermore, a smallest possible part of the outside of the inlet member can be in contact with liquid, independent of the level of the liquid surface in the container.
    Type: Grant
    Filed: March 21, 2000
    Date of Patent: October 18, 2005
    Assignee: Alfa Laval AB
    Inventors: Jesus Montano, Rolf Ridderstrale, Klaus Hans Dieter Stroucken
  • Patent number: 6837842
    Abstract: An indication device indicates an undesired operation condition of a centrifugal separator and comprises an inlet valve situated in a supply conduit to the separator, and an outlet valve situated in an outlet conduit from the separator. During normal operation of the separator the valves are adjusted in open normal valve positions for passing normal flows through the supply and outlet conduits. A control unit is adapted to activate a signal generator to generate an error signal in response to a pressure sensor if the pressure sensor during a predetermined period of time during operation of the separator senses a course of pressure change in the outlet conduit different from an expected normal course of pressure change, when the inlet and outlet valves during predetermined period of time are adjusted in valve positions which at least substantially decreases the flows in the supply and outlet conduits from the normal flows.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: January 4, 2005
    Assignee: Alfa Laval AB
    Inventor: Lars Håkan Dellden
  • Patent number: 6821319
    Abstract: In connection with cleaning of gas from particles suspended therein and being heavier than the gas the gas is caused to rotate in a chamber delimited in a stationary housing, so that the particles by centrifugal force are separated from the gas and are thrown towards a stationary housing. The rotation of the gas is accomplished by means of a rotor, which includes a stack of conical separation discs arranged coaxially with each other and concentrically with the rotational axis of the rotor. The gas to be cleaned is caused to flow through interspaces between the separation discs, while they are rotating, the particles by the centrifugal force being brought into contact with the insides of the separation discs. In contact with the insides of the separation discs the particles first move along the generatrices of the separation discs and then move along inclined guiding members, which are arranged in contact with said insides.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: November 23, 2004
    Assignee: Alfa Laval AB
    Inventors: Hans Moberg, Torgny Lagerstedt, Claes Inge, Claes-Göran Carlsson, Stefan Szepessy, Peter Franzén, Leonard Borgström
  • Patent number: 6802804
    Abstract: To clean a relatively heavy liquid from small amounts of relatively light liquid the liquids are first introduced into a container, in which the light liquid is allowed to collect on the surface of the heavy liquid. A surface layer of the liquid body in the container, constituting a mixture of the two liquids, is caused to flow over an overflow outlet member into a collecting chamber. From the collecting chamber the liquid mixture is pumped further into a centrifugal separator, wherein the relatively light liquid is separated from the relatively heavy liquid. According to the invention the liquid mixture is pumped from the collecting chamber to the centrifugal separator through a pumping member, which is connected with a rotor of the centrifugal separator and, thus, rotates therewith.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: October 12, 2004
    Assignee: Alfa Laval AB
    Inventor: Klaus Hans Dieter Stroucken
  • Patent number: 6751951
    Abstract: Gases produced by a combustion engine, e.g. crankcase gases, are conducted through a separation chamber formed and surrounded by a centrifugal rotor, by means of which the gases are caused to rotate, so that particles suspended in the gases are separated by means of centrifugal force. The centrifugal rotor is caused to rotate by means of a pressure fluid that is generated by means of the combustion engine.
    Type: Grant
    Filed: January 9, 2003
    Date of Patent: June 22, 2004
    Assignee: Alfa Laval AB
    Inventors: Leonard Borgström, Claes Göran Carlsson, Peter Franzén, Claes Inge, Torgny Lagerstedt, Hans Moberg, Stefan Szepessy, Tommy Myrvang
  • Patent number: 6716153
    Abstract: In a decanter centrifuge having a rotor and a screw conveyor the rotor is suspended only at its one end, the rotational axis of the rotor extending vertically. The inlet of the rotor for a sludge containing liquid to be separated as well as the rotor outlet for liquid having been freed from sludge are situated at the upper end of the rotor, whereas a sludge outlet for separated sludge is situated at the lower end of the rotor. The rotor as well as the screw conveyor are adapted to be driven through shafts situated at the upper end of the rotor. By the invention it becomes possible by simple implementation to adapt the decanter centrifuge for different separation duties, since the location of the sludge outlet can be chosen freely without other parts of the decanter centrifuge preventing this.
    Type: Grant
    Filed: October 4, 2002
    Date of Patent: April 6, 2004
    Assignee: Alfa Laval AB
    Inventors: Klaus Stroucken, Rolf Riddersträle
  • Patent number: 6712751
    Abstract: In a decanter centrifuge having a rotor and a screw conveyor the rotor is suspended only at its one end, the rotational axis of the rotor extending vertically. The inlet of the rotor for a sludge containing liquid to be separated as well as the rotor outlet for liquid having been freed from sludge are situated at the upper end of the rotor, whereas a sludge outlet for separated sludge is situated at the lower end of the rotor. The rotor as well as the screw conveyor are adapted to be driven through shafts situated at the upper end of the rotor. By the invention it becomes possible by simple implementation to adapt the decanter centrifuge for different separation duties, since the location of the sludge outlet can be chosen freely without other parts of the decanter centrifuge preventing this.
    Type: Grant
    Filed: October 4, 2002
    Date of Patent: March 30, 2004
    Assignee: Alfa Laval AB
    Inventors: Klaus Stroucken, Rolf Ridderstråle
  • Patent number: 6676131
    Abstract: Sealing ring (1) for a centrifugal separator with an axially open annular groove (7) for the sealing ring in a first rotor part (2) and a relative to the first rotor part (2) axially movable second rotor part (3), against which the sealing ring (1) sealingly abuts. Both the sealing ring (1) and the groove (7) have a first annular portion (8 and 9, respectively) turned towards the second rotor part (3) and a second annular portion (14 and 11, respectively) turned away from the second rotor part (3). The second portion (11) of the groove has an outer annular recess (12) and an inner annular recess (16) whereas the second annular portion (14) of the sealing ring (1) has at least one projection (15), which is arranged to at least partly fill up the outer recess of the groove (7).
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: January 13, 2004
    Assignee: Alfa Laval AB
    Inventor: Sven Hedin
  • Patent number: 6662862
    Abstract: The present invention concerns a plate heat exchanger for at least two heat exchanging fluids which is permanently joined with at least one sealing portion and has heat transferring plates (1-8), at least two end plates and inlet and outlet organs for the heat exchanging fluids. The core of plates includes alternating heat transferring plates (1-4) and intermediate heat transferring plates (5-8) between the alternating plates. Adjacent plates form a double wall plate unit. The plate elements are permanently joined with each other in a plurality of points having spaced apart areas. For each one of the double wall units, ridges (9) and valleys (16) on the alternating plate (1-4) are in tight contact with the corresponding ridges (9) and valleys (10) on the intermediate plates (5-8) except right at at least one of the points with the spaced apart areas.
    Type: Grant
    Filed: January 25, 2002
    Date of Patent: December 16, 2003
    Assignee: Alfa Laval AB
    Inventor: Ingvar Helge Birger Lindholm
  • Patent number: 6644391
    Abstract: The invention relates to a spiral heat exchanger including at least two spiral sheets (1, 2) extending along a respective spiral-shaped path about a common center axis (x) and forming at least two spiral-shaped, substantially parallel flow channels (4, 5). Each flow channel (4, 5) permits a heat exchange fluid to flow in a substantially tangential direction with respect to the center axis (x). Each flow channel includes a radially outer orifice, which forms an outlet or an inlet of the respective flow channel and which is located at a radially outer part of the respective flow channel and a radially inner orifice, which enables communication between the respective flow channel and a respective inlet/outlet chamber (13, 14). The center axis (x) extends through the inlet/outlet chamber of the radially inner orifice. The spiral heat exchanger includes a center body (3) extending around the center axis (x) and being closed with respect to the flow channels (4, 5).
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: November 11, 2003
    Assignee: Alfa Laval AB
    Inventors: Olivier Fourt, Philippe Maupetit
  • Patent number: 6626814
    Abstract: A drive unit for a centrifuge rotor of a centrifugal separator is provided that includes a drive shaft, arranged to support the centrifuge rotor and rotatably journalled around an axis (z) of rotation, a casing, which forms an inner space for the drive shaft, a drive motor shaft which is provided outside the casing and connected to the drive shaft by means of a transferring member extending through a passage in the casing, at least one shielding member, which is provided inside the casing in such a manner that the part of the transferring member which is located inside the casing is shielded from the inner space, and wherein the shielding member forms a channel, which extends through the casing and is shielded from the inner space of the casing.
    Type: Grant
    Filed: July 17, 2001
    Date of Patent: September 30, 2003
    Assignee: Alfa Laval AB
    Inventor: Jan Setterberg
  • Patent number: 6616731
    Abstract: The present invention is a method and apparatus for monitoring the vacuum conditions for the treatment of vegetable or animal oil. During the treatment, a number of processes, such as refining, bleaching and/or deodorization, are carried out under a vacuum. The vacuum is maintained by a vacuum system, comprised of at least one vacuum creating means and at least one condenser, and a pump arranged at the outlet of the condenser. The condenser is connected to a mass flow meter monitoring the flow of a gas and generates a signal receivable by a controller. The method of monitoring the vacuum system, using the above apparatus, includes the steps of sensing, and registering the mass flow of non-condensable gas out of the vacuum system. An alarm is triggered when the amount of gas exiting the vacuum system differs from a set value.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: September 9, 2003
    Assignee: Alfa Laval AB
    Inventor: Anders Hillstrom
  • Patent number: 6616589
    Abstract: The invention disclosed is control equipment for use with a nozzle centrifuge for separating a light phase liquid, a heavy phase liquid, and/or solids from a mixture thereof wherein the separated heavy phase and solids are continuously removed through nozzles that are arranged at the periphery of the rotor of the nozzle centrifuge. Separated light phase liquid is discharged through a central outlet in the rotor. Through a space in the rotor, which communicates with the radially outer part of the rotor separating chamber, liquid may either be supplied under pressure to the rotor or be discharged from the rotor for maintaining an interface layer formed in the separating chamber between separated light and heavy phases. A supply device and a discharge device are adapted to supply to the rotor and discharge from the rotor, respectively, only so much liquid as is required for said purpose.
    Type: Grant
    Filed: October 23, 2000
    Date of Patent: September 9, 2003
    Assignee: Alfa Laval AB
    Inventor: Olev Maehans
  • Patent number: 6578670
    Abstract: The invention refers to a drive unit (1) for a centrifuge rotor (2) of a centrifugal separator. The drive unit (1) includes a drive shaft (3), which is arranged to support said centrifuge rotor (2) and is rotatably journalled around an axis (z) of rotation, a casing (6), which forms an inner space for the drive shaft (3), and a drive motor shaft (9), which is provided outside the casing (6) and connected to the drive shaft (3) by means of a transferring member (11) which extends through a passage (12) in the casing (6). A shielding member (23) is provided inside the casing (6) in such a way that the part of the transferring member (11), which is located inside the casing (6) is shielded from the inner space, wherein the shielding member (23) forms a channel, which extends through the casing (6) and is shielded from the inner space of the casing.
    Type: Grant
    Filed: July 16, 2001
    Date of Patent: June 17, 2003
    Assignee: Alfa Laval AB
    Inventors: Kjell Klintenstedt, Torbjörn Larsen, Jan Setterberg, Stefan Szepessy
  • Publication number: 20030097835
    Abstract: Gases produced by a combustion engine (1), e.g. crankcase gases, are conducted through a separation chamber formed and surrounded by a centrifugal rotor (R), by means of which the gases are caused to rotate, so that particles suspended in the gases are separated by means of centrifugal force. The centrifugal rotor (R) is caused to rotate by means of a pressure fluid that is generated by means of the combustion engine (1).
    Type: Application
    Filed: January 9, 2003
    Publication date: May 29, 2003
    Applicant: Alfa Laval AB
    Inventors: Leonard Borgstrom, Claes Goran Carlsson, Peter Franzen, Claes Inge, Torgny Lagerstedt, Hans Moberg, Stefan Szepessy, Tommy Myrvang
  • Patent number: 6536511
    Abstract: A device for treating a substantially gaseous medium includes a number of parallel plates (14) which are connected to each other and provided adjacent to each other in such a manner that they, via port holes in the plates (14), form a first channel (5) and a second channel (9, 9′). The first channel (5) is arranged to transport the gaseous medium, and the second channel (9, 9′), which is separated from but in heat transferring contact with the first channel (5), is arranged to transport a cooling medium for cooling the gaseous medium. At least a part (3) of the first channel (5) is arranged to separate liquid from the gaseous medium. The part (3) of the first channel (5) is formed by a plurality of plate interspaces between a part of the plates (14), wherein at least one of the plates (14), delimiting one of the plate interspaces, is arranged to be passed by the gaseous medium on both sides thereof.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: March 25, 2003
    Assignee: Alfa Laval AB
    Inventors: Magnus Nilsson, Klas Bertilsson
  • Patent number: 6536211
    Abstract: Gases produced by a combustion engine (1), e.g. crankcase gases, are conducted through a separation chamber formed and surrounded by a centrifugal rotor (R), by means of which the gases are caused to rotate, so that particles suspended in the gases are separated by means of centrifugal force. The centrifugal rotor (R) is caused to rotate by means of a pressure fluid that is generated by means of the combustion engine (1).
    Type: Grant
    Filed: December 4, 2000
    Date of Patent: March 25, 2003
    Assignee: Alfa Laval AB
    Inventors: Leonard Borgström, Claes Göran Carlsson, Peter Franzén, Claes Inge, Torgny Lagerstedt, Hans Moberg, Stefan Szepessy, Tommy Myrvang
  • Patent number: 6537191
    Abstract: In a centrifugal separator for separating solids from a liquid mixture in which the solids in the form particles are suspended in a liquid having a density less than that of the particles the centrifugal separator includes a rotor rotatable at a first speed. A screw conveyor is arranged in and coaxial with the rotor and rotates at a second speed differing from the first speed. A drive device is adapted for rotation of the rotor at the first speed and the screw conveyor at the second speed. The rotor is totally supported at one end only through a rotor shaft that is arranged so that the rotor central axis extends substantially vertically. The rotor includes an inlet for the mixture, in the form of at least one inlet channel which extends into the rotor at one end and a liquid outlet for separated liquid, in the form of at least one outlet channel which extends out of the rotor at one end, and a sludge outlet for separated solids situated at an opposite end of the rotor.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: March 25, 2003
    Assignee: Alfa Laval AB
    Inventors: Klaus Stroucken, Rolf Ridderstråle