Patents Assigned to Danfoss Compressors GmbH
  • Publication number: 20030150670
    Abstract: The invention concerns a suction muffler for a refrigerating machine with a housing, in which at least one chamber is arranged and which has an inlet opening (7), an outlet opening and an oil discharge opening.
    Type: Application
    Filed: January 16, 2003
    Publication date: August 14, 2003
    Applicant: Danfoss Compressors GmbH
    Inventors: Christian Svendsen, Jens Erik Nissen, Morten Svendsen
  • Patent number: 6562767
    Abstract: A lubricant for wire, which is insulated by means of a lacquer coating, and which is used for forming the stator windings of an electrical refrigerating compressor, consists of one or more compounds of the formula CH3—Xn—R, wherein X is a linear or branched hydrocarbon group with n carbon atoms, wherein n is up to 22, and R may be hydrogen or a plurality of different radicals, either in a pure form or dissolved in a suitable solvent. The lubricant is applied to the wire to reduce its coefficient of friction, and it is remarkable for its compatibility with the environmentally unharmful refrigerants, such as R134a (1,1,1,2-tetrafluoroethane), which are used today in refrigerating compressors without capillary tube obstructions.
    Type: Grant
    Filed: February 12, 1996
    Date of Patent: May 13, 2003
    Assignee: Danfoss Compressors GmbH
    Inventors: Jürgen Bachmann, Lars L. Finsen, Poul Erik Hansen
  • Publication number: 20030052559
    Abstract: Specified is an electric motor with a stator (1) that displays a rotating-field-generating rotating-field winding arrangement and a bore (3) in which is arranged a rotor.
    Type: Application
    Filed: August 6, 2002
    Publication date: March 20, 2003
    Applicant: Danfoss Compressors GmbH
    Inventor: Niels Christian Weihrauch
  • Patent number: 6483278
    Abstract: A method and power supply device for generating a regulated direct voltage from an alternating voltage using a step-down transformer, a step-up transformer, an inductance coil and a control device that controls the transformer in a step-down or step-up transformation mode is disclosed herein. An inductance coil voltage measuring signal is compared with three limiting values (A, B, C), wherein A corresponds to zero, B lies between A and C and B and C correspond to the direct voltage. Switching from the step-down to the step-up transformation mode is effected when the increasing voltage measuring signal drops after reaching B and A is not reached again and increases to C instead. Switching from step-down to step-up transformation mode is effected when the decreasing voltage measuring signal increases after reaching A and B is not reached and drops to A instead.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: November 19, 2002
    Assignee: Danfoss Compressors GmbH
    Inventor: Nils-Ole Harvest
  • Publication number: 20020101128
    Abstract: The invention relates to an electric motor, comprising a rotor (1). One side of said rotor (1) is mounted in a stator (3) by means of a bearing (2) and the rotor tapers away conically from said stator in an axial direction, forming an air gap (4) between the latter (3) and the rotor. The width of said gap increases in an axial direction, moving away from the bearing (2). The aim of the invention is to achieve improved operating efficiency using a conically designed rotor.
    Type: Application
    Filed: March 20, 2002
    Publication date: August 1, 2002
    Applicant: Danfoss Compressors GmbH
    Inventor: Niels Christian Weihrauch
  • Patent number: 6402484
    Abstract: The invention concerns a refrigerant compressor with a cylinder block (1), a valve plate (4), a pipe connectable or connected with a suction muffler, a cover (2) covering the valve plate (4), a first sealing (3) between cover and valve plate and a second sealing (5) between valve plate and cylinder block. On assembling the refrigerant compressor it should be provided that the flow resistance of the suction gas is reduced as much as possible. For this purpose, each of the following pairs of members, cover. (2) and pipe (29), pipe (29) and valve plate (4) and valve plate (4) and cylinder block (1), has an alignment device for its members with at least two guiding elements, and that the members (2, 29, 4, 1) are assembled in a direction, which is substantially parallel to the guiding elements.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: June 11, 2002
    Assignee: Danfoss Compressors GmbH
    Inventors: Morten Svendsen, Frank Holm Iversen
  • Patent number: 6380707
    Abstract: The brushless electric motor (M) is provided with switching means (Q1-Q6) for selectively supplying current to the armature windings (U, V, W) of the motor (M) from a DC-power supply (1) The switching means (Q1-Q6) are controlled by measuring the back-electromotive forces developed in the windings (U, V, W) during operation and comparing these measurements with a high and low reference voltage, in such a way that each time a measured back-electromotive force with positive slope crosses the high reference voltage or a measured back-electromotive force with negative slope crosses the low reference voltage, a commutation signal is generated to commutate the switching means (Q1-Q6), this provides a highly simplified control of the switching means.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: April 30, 2002
    Assignee: Danfoss Compressors GmbH
    Inventors: Jesper Riber Rosholm, Jan Carøe Aarestrup
  • Patent number: 6358019
    Abstract: A suction sound damper for a hermetically encapsulated compressor has a housing that is formed of at least an upper part (3), a lower part (1) and an insert (2), and having at least two chambers (7, 8) and a channel (9), connected thereto, leading from a lower inlet opening (10) to an upper outlet opening (11). The insert (2) has a side wall (18) which, together with a section (19) of the housing wall, forms a capillary gap (20) in which lubricating oil collects and is retained. This produces additional sound damping.
    Type: Grant
    Filed: May 9, 2000
    Date of Patent: March 19, 2002
    Assignee: Danfoss Compressors GmbH
    Inventors: Frank Holm Iversen, Jan Thomsen
  • Patent number: 6305912
    Abstract: The invention concerns a refrigerant compressor with a cylinder block (1), a valve plate (4), a pipe connectable or connected with a suction muffler, a cover (2) covering the valve plate (4), a first sealing (3) between cover and valve plate and a second sealing (5) between valve plate and cylinder block. On assembling the refrigerant compressor it should be provided that the flow resistance of the suction gas is reduced as much as possible. For this purpose, each of the following pairs of members, cover (2) and pipe (29), pipe (29) and valve plate (4) and valve plate (4) and cylinder block (1), has an alignment device for its members with at least two guiding elements, and that the members (2, 29, 4, 1) are assembled in a direction, which is substantially parallel to the guiding elements.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: October 23, 2001
    Assignee: Danfoss Compressors GmbH
    Inventors: Morten Svendsen, Frank Holm Iversen
  • Patent number: 6280153
    Abstract: A suction gas conduit (1) for a refrigeration compressor has a curved section (4) of the gas path (2), which connects an inlet section (3) of the gas path to an outlet section (5). A widening (11) in the form of a step (12) is located on the inner side of the curve of the gas path. The curved section (4) especially abuts, at the outlet end, a valve plate (7) of the compressor, which valve plate (7) has a suction gas opening (6). The outer side of the curve of the gas path (2) is unimpeded. The step height (H) is from 0.3 to 1.0 times, and the step length (L) from 0.2 to 1.0 times, the hydraulic diameter (d) of the outlet section (5). As a result thereof, the unavoidable recirculation flow is located in a position where its undesirable effect is limited.
    Type: Grant
    Filed: May 9, 2000
    Date of Patent: August 28, 2001
    Assignee: Danfoss Compressors GmbH
    Inventors: Frank Holm Iversen, Preben Bjerre
  • Patent number: 6272971
    Abstract: The invention concerns a connecting rod for a hermetic refrigerating compressor, in which the connecting rod forms the mechanical connection between a crank and a piston. The purpose of the invention is to reduce wear in the crank bearing of the compressor with simple means. This is obtained by reducing compressive stresses in the connecting rod by making a cut-out in the connecting rod near the crank bearing. The cut-out causes deflection of compressive stresses, so that they are distributed over a larger share of the crank bearing surface. Also the outer shape of the connecting rod is adapted, so that also here the compressive stresses are distributed over a larger bearing surface. This reduces the wear on the crank bearing of the compressor and increases the life.
    Type: Grant
    Filed: February 11, 2000
    Date of Patent: August 14, 2001
    Assignee: Danfoss Compressors GmbH
    Inventors: Jan Thomsen, Peter Hansen
  • Patent number: 6134901
    Abstract: The invention concerns a method for speed control of a compressor, particularly a refrigeration compressor, and a control arrangement using this method. The speed control is effected in that a control arrangement varies the speed of an electric motor in dependence of simple ON/OFF signals from a thermostat placed in the surroundings to be cooled. The method according to the invention is characterized in that the starting speed of the compressor in a following ON period is reduced in relation to the final speed in the previous ON period. A continuous reduction of the starting speed of each ON period results in a self-regulating control giving long compressor operation times and an averagely low speed resulting in energy savings. A control arrangement using this method is also described.
    Type: Grant
    Filed: April 9, 1999
    Date of Patent: October 24, 2000
    Assignee: Danfoss Compressors GmbH
    Inventors: Nils-Ole Harvest, Jan Aarestrup
  • Patent number: 6017197
    Abstract: A suction sound damper for a refrigerant compressor is disclosed, having an inlet, which is arranged to be connected to a suction port, and an outlet, which is arranged to be connected to the refrigerant compressor, and also having at least one damping volume. It is desirable for a suction sound damper of that kind to be of simple and inexpensive construction, and to contribute to increasing the efficiency of a refrigerant compressor. For that purpose, it is formed from a first and second half which define an internal space in which the damping volume is arranged, the first half having projecting into the internal space a gas deflection wall which, at least over sections thereof, forms a lateral limitation of a flow path free from throttle points between inlet and outlet.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: January 25, 2000
    Assignee: Danfoss Compressors GmbH
    Inventors: Michael Skovgaard Jensen, Frank Holm Iversen
  • Patent number: 6006785
    Abstract: A suction valve for an axial piston compressor has a leaf spring fixed at one end, which spring at one end is fixed with a fixed portion between valve plate and cylinder block, at its other end covers over the suction valve opening with a closure portion and has an intermediate portion connecting these portions. The intermediate portion is located substantially outside the cylinder cross-section. A stop for the suction valve leaf spring is arranged in the region of the cylinder wall facing the fixed portion. This produces an optimum filling of the cylinder and thus an improvement in the efficiency of the compressor, as is especially desirable for refrigeration compressors.
    Type: Grant
    Filed: September 23, 1998
    Date of Patent: December 28, 1999
    Assignee: Danfoss Compressors GmbH
    Inventor: Frank Holm Iversen
  • Patent number: 5957671
    Abstract: A refrigerant compressor is disclosed, having an electric motor, the stator of which has windings with winding heads and the rotor of which drives a compressor which comprises a compressor lock having an axially projecting bearing part for a rotor shaft, one winding head extending in the direction of the compressor block and electrical insulation being provided between the winding head and the compressor block. With the same overall size, it is desirable to be able to improve the efficiency of such a refrigerant compressor without markedly increasing the effort involved in assembly. To that end, the insulation is formed by a film which is pushed with a substantially centrally arranged opening onto the bearing part.
    Type: Grant
    Filed: October 27, 1997
    Date of Patent: September 28, 1999
    Assignee: Danfoss Compressors GmbH
    Inventor: Svend Erik Outzen
  • Patent number: 5803717
    Abstract: A refrigerant compressor arrangement is disclosed, having a compressor which is arranged in a housing and which has a suction connection, the housing being provided with a suction connector which is joined to the suction connection by way of a suction channel. In such an arrangement, it is desirable to increase the opportunity of the compressor to move, that is, to reduce noise, without at the same time having to accept a deterioration in efficiency. To that end, at its housing end the suction channel is in the form of a telescope tube which is capable of being telescoped into the suction connector.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: September 8, 1998
    Assignee: Danfoss Compressors GmbH
    Inventors: Frank Holm Iversen, Svend Erik Outzen, Hans Christian Andersen