EP3215737B1 - Verbesserter rotor zur verwendung in einem elektrischen motor eines hermetischen verdichters - Google Patents

Verbesserter rotor zur verwendung in einem elektrischen motor eines hermetischen verdichters Download PDF

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Publication number
EP3215737B1
EP3215737B1 EP14793100.0A EP14793100A EP3215737B1 EP 3215737 B1 EP3215737 B1 EP 3215737B1 EP 14793100 A EP14793100 A EP 14793100A EP 3215737 B1 EP3215737 B1 EP 3215737B1
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EP
European Patent Office
Prior art keywords
inner diameter
hermetically sealed
diameter portion
sealed compressor
rotor
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Application number
EP14793100.0A
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English (en)
French (fr)
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EP3215737A1 (de
Inventor
Bilgin Hacioglu
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Arcelik AS
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Arcelik AS
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Priority to PL14793100T priority Critical patent/PL3215737T3/pl
Publication of EP3215737A1 publication Critical patent/EP3215737A1/de
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Publication of EP3215737B1 publication Critical patent/EP3215737B1/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F04B39/0223—Lubrication characterised by the compressor type
    • F04B39/023—Hermetic compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric

Definitions

  • the present invention relates to a hermetically sealed compressor of a refrigeration appliance such as a domestic refrigerator.
  • the present invention particularly relates to the electric motor of the hermetically sealed compressor.
  • the present invention more particularly relates to the rotor of the electric motor.
  • Hermetically sealed compressors which are used in refrigeration appliances are commonly known.
  • the refrigeration appliances come with different refrigeration capacities.
  • the refrigeration capacity of the refrigeration appliance generally depends on the refrigeration capacity of the compressor used therein.
  • the hermetically sealed compressors having different refrigeration capacities are generally produced as a family of compressors in which the individual compressors differ from each other mainly through a small number of components such as the electric motor, and a small number of modifications made to the size of the cylinder bores, the pistons and the like. Other differences are generally kept minor such that the same or similar components can be used in the assembly of the individual compressors.
  • the electric motors with different electric powers have respectively different dimensions, and thus require a corresponding installation space inside the casing, in particular below the cylinder housing.
  • Prior art document BR9201761 describes a hermetic compressor including a bearing for supporting a vertical eccentric shaft that is fixed to the rotor of an electric motor.
  • WO 1995/27138 A1 discloses a compressor with a pump rotor of an inverted frustoconical shape having a lower nozzle immersed in the oil sump.
  • the document DE 10 2007 038443 discloses a hermetic compressor which motor rotor comprises a ring element into which the bearing enters and to which the crankshaft is attached. The lower portion providing a tapered shape. To the outer circumferential surface being attached the permanent magnets of the electric motor.
  • Fig. 1 shows a hermetically sealed compressor (3') which is known from the prior art.
  • This prior art compressor (3') comprises a cylinder housing (4') which has a main bearing (5'), a crankshaft (6') which is journalled into the main bearing (5'), a sump (7') which contains lubricant, and a lubricant pick-up tube (7a') which is partly immersed into the lubricant sump (7').
  • the prior art compressor (3') further comprises an electric motor (2') which is arranged below the cylinder housing (4').
  • the prior art electric motor (2') comprises a rotor (1') and a matching stator (10') which respectively have the heights H1'.
  • the rotor (1') comprises a core (8') which has a central through hole (9') for concentrically receiving the crankshaft (6').
  • the stator (10') comprises a core (11'), a winding (12'), and a central opening (13') for concentrically receiving the rotor core (8').
  • the rotor core (8') comprises an outer diameter portion (14) with a height H1' which is concentrically arranged into the opening (13') of the stator core (11'), and an inner diameter portion (15') with a height H2' which is press-fitted onto the crankshaft (6).
  • a problem with the prior art compressor (3') is that the stable operation of the crankshaft (6') is jeopardized with increasing size and power of the electric motor (2'). Therefore, in the hermetically sealed compressor (3') it is generally desired to increase the height B' of the main bearing (5') so as to safeguard the stable operation of the crankshaft (6'). If the height B' of the main bearing (5') is increased in the upward direction, the overall height of the compressor (3') must also be increased. This would impede the lubrication performance. Moreover, this is not desired in view of the increasing transportation costs and the drop in the utilizable volume of the refrigeration appliance.
  • An objective of the present invention is to provide a rotor for use in an electric motor of a hermetically sealed compressor, and a refrigeration appliance having the same which overcomes the aforementioned drawbacks of the prior art in a cost effective way and which enables a reliable assembly of the rotor and a reliable operation of the crankshaft.
  • the rotor of the present invention comprises an extending portion which extends downwardly from the lower surface of the outer diameter portion.
  • the extending portion has a tapered shape. At least a part of the through hole within the extending portion is defined by the inner diameter portion which is to be press fitted onto the crankshaft.
  • the fixation of the rotor to the crankshaft has been improved.
  • an electric motor with a comparatively smaller or a comparatively larger size can be reliably installed into the compressor.
  • a power-to-size ratio of the hermetically sealed compressor has also been improved.
  • the rotor of the present invention it becomes also possible to utilize a comparatively longer main bearing without the need of increasing the overall height of the compressor.
  • a hermetically sealed compressor has been provided which can be reliably operated even at comparatively high refrigeration capacities involving comparatively large sized electric motors and high rotational speeds. Thereby, a consumer satisfaction can be increased.
  • the rotor core comprises an inner tubular portion for picking up lubricant from the lubricant sump. At least a part of the through hole within the extending portion is defined by the inner tubular portion.
  • the rotor core also serves as a lubricating device. Thereby, the need for installing a separate lubricant pick-up tube has been obviated.
  • the rotor core has a divider.
  • the divider improves the lubrication performance of the extending portion.
  • the rotor has a laminated core.
  • the rotor has a solid core.
  • the rotor (1) is suitable for use in an electric motor (2) of a hermetically sealed compressor (3) ( Fig. 2 to 9 ).
  • the compressor (3) comprises a cylinder housing (4) which has a main bearing (5), a crankshaft (6) which is journalled into the main bearing (5), and a lubricant sump (7).
  • the rotor (1) comprises a core (8) which has a central through hole (9) for concentrically receiving the crankshaft (6).
  • the electric motor (2) comprises a stator (10) which has a core (11), a winding (12), and a central opening (13) for concentrically receiving the rotor core (8).
  • the rotor core (8) further comprises an outer diameter portion (14) and an inner diameter portion (15).
  • the outer diameter portion (14) has a substantially constant outer diameter that is slightly smaller than the inner diameter of the central opening (13).
  • the outer diameter portion (14) has a height H1 which is equal to the height H1 of the stator core (11).
  • the inner diameter portion (15) has a substantially constant inner diameter for receiving the crankshaft (6) by press fitting.
  • the inner diameter portion (15) has a height H2.
  • the rotor core (8) further comprises an extending portion (16) which extends downwards from the lower surface of the outer diameter portion (14).
  • the extending portion (16) has a tapered shape. At least a part of the through hole (9) within the extending portion (16) is defined by the inner diameter portion (15). Thereby, the rotor core (8) can be press fitted onto the corresponding segment of the crankshaft (6) via the extending portion (16).
  • the rotor core (8) further comprises an enlarged inner diameter portion (17) for receiving the main bearing (5).
  • the enlarged inner diameter portion (17) has a substantially constant and relatively larger inner diameter in comparison to the inner diameter of the inner diameter portion (15).
  • the enlarged inner diameter portion (17) is positioned above the inner diameter portion (15). At least a part of the through hole (9) within the outer diameter portion (14) is defined by the enlarged inner diameter portion (17) ( Fig. 2 to 9 ).
  • the through hole (9) within the outer diameter portion (14) is entirely defined by the enlarged inner diameter portion (17).
  • the outer diameter portion (14) and the enlarged inner diameter portion (17) have the same height (H1) so that the tip of main bearing (5) is adjacent to the lower surface of the of the outer diameter portion (14) ( Fig. 2 and 5 ).
  • At least a part of the through hole (9) within the outer diameter portion (14) is also defined by the inner diameter portion (15).
  • the inner diameter portion (15) is positioned both in the extending portion (16) and the outer diameter portion (14) ( Fig. 3 to 4 , and 6 to 9 ).
  • the rotor core (8) comprises an inner tubular portion (18) for picking up lubricant from the lubricant sump (7). At least a part of the through hole (9) within the extending portion (16) is defined by the inner tubular portion (18). The inner tubular portion (18) is positioned below the inner diameter portion (15). In the mounted state, the extending portion (16), in particular the inner tubular portion (18) is partly immersed into the lubricant sump (7) ( Fig. 5 to 9 ).
  • the inner tubular portion (18) has a substantially constant and relatively smaller inner diameter in comparison to the inner diameter of the inner diameter portion (15) ( Fig. 5 to 9 ).
  • the rotor (1) comprises an abutment (19) for contacting the tip of the crankshaft (6).
  • the abutment (19) is defined by the step between the inner diameter portion (15) and the inner tubular portion (18) ( Fig. 5 to 9 ).
  • the rotor core (1) comprises a divider (20) ( Fig. 9 ).
  • the divider (20) is diametrically disposed into the inner tubular portion (18).
  • the rotor core (8) comprises a plurality of stacked laminations (not shown).
  • the entire rotor core (8), including the outer diameter portion (14) and the extending portion (16) are produced by stacking a plurality of laminations.
  • the rotor core (8) is a single piece. In this embodiment, the entire rotor core (8), including the outer diameter portion (14) and the extending portion (16) are produced as a solid core (8).
  • the present invention also provides an electric motor (2) for use in the hermetically sealed compressor (3) of a refrigeration appliance.
  • the electric motor (2) of the present invention comprises the rotor (1) and the stator (10).
  • a gap (21) is provided between the rotor (1) and the stator (10).
  • the present invention also provides a hermetically sealed compressor (3) which comprises the electric motor (2).
  • the electric motor (2) is arranged under the cylinder housing (4) ( Fig. 2 to 9 ).
  • the tip of the extending portion (16) is partly immersed into the lubricant sump (7) ( Fig. 5 to 9 ).
  • the inner tubular portion (18) pumps lubricant from the sump (7) to the crankshaft (6) under the action of the centrifugal forces ( Fig. 5 to 9 ).
  • the compressor (3) is hermetically sealed by the upper casing and the lower casing.
  • the lower casing serves as the lubricant sump (7).
  • the extending portion (16) of the rotor (1) is partly immersed into the lubricant sump (7).
  • the lubricant enters the inner tubular portion (18) via the through hole (9).
  • the crankshaft (6) When the crankshaft (6) is rotated by the motor (2), the extending portion (16) sets the lubricant therein into whirling motion, and the lubricant starts ascending along the inner surface of the inner tubular portion (18) into the lubricant passageway (not shown) of the crankshaft (6), and therefrom to the bearing regions of the piston (22) and the crankshaft (6).
  • the piston (22) is reciprocatingly disposed into the cylinder chamber (23) for compressing the refrigerant therein.
  • the piston (22) is coupled via the rod (24) and the pin (25) to the crankshaft (6).
  • the cylinder chamber (23) is covered by the cylinder head (26).
  • the compressed refrigerant enters the exhaust chamber (27) of the cylinder head (26) via the exhaust port (28) of the valve (29) which is arranged between the cylinder head (26) and the cylinder chamber (23).
  • the piston (22) moves rearwards, the refrigerant is sucked through the silencer (30) and the intake port (31) of the valve (29) into the cylinder chamber (23) ( Fig. 5 to 9 ).
  • the rotor (1) can be alternatively utilized in combination with an auxiliary lubricant pick up tube (7a) which is mounted into the tip of the crankshaft (6) ( Fig. 2 to 4 ).
  • the present invention also provides a refrigeration appliance (not shown), in particular a domestic refrigerator which comprises the hermetically sealed compressor (3) ( Fig. 2 to 9 ).
  • the assembly of the electric motor (2) with the hermetically sealed compressor (3) has been improved.
  • a power-to-size ratio of the hermetically sealed compressor (3) has also been improved. Thereby, a consumer satisfaction can be increased.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)

Claims (12)

  1. Ein hermetisch abgedichteter Kompressor (3) umfasst
    - ein Zylindergehäuse (4) mit einem Hauptlager (5)
    - eine Kurbelwelle (6), die in das Hauptlager (5) gelagert ist,
    - eine Schmierstoffwanne (7), und
    - einen Elektromotor (2) mit einem Rotor (1), der einen Kern (8) umfasst, der ein zentrales Durchgangsloch (9) zum konzentrischen Aufnehmen der Kurbelwelle (6) aufweist, wobei der Elektromotor (2) darüber hinaus einen Stator (10) umfasst, der einen Kern (11), eine Wicklung (12) und eine zentrale Öffnung (13) zum konzentrischen Aufnehmen des Rotorkerns (8) umfasst;
    wobei der Rotorkern (8) folgendes umfasst,
    - einen Außendurchmesser-Abschnitt (14), der einen erheblich konstanten Außendurchmesser aufweist, der etwas kleiner als der Innendurchmesser der zentralen Öffnung (13) ist, und eine Höhe H1, die gleich der Höhe H1 des Statorkerns (11) ist und
    - einen Innendurchmesser-Abschnitt (15), der einen erheblich konstanten Innendurchmesser zum Aufnehmen der Kurbelwelle (6) durch Pressverbindung aufweist, und eine Höhe H2,
    - einen sich erstreckenden Abschnitt (16), der sich von der unteren Oberfläche des Außendurchmesser-Abschnittes (14) nach unten erstreckt und eine spitz zulaufende Form aufweist, wobei mindestens ein Teil des Durchgangslochs (9) innerhalb des sich erstreckenden Abschnitts (16) durch den Innendurchmesser-Abschnitt (15) definiert ist,
    - einen inneren rohrförmigen Abschnitt (18) zum Aufnehmen von Schmiermittel aus dem Schmierstoffsumpf (7), wobei mindestens ein Teil des Durchgangslochs (9) innerhalb des sich erstreckenden Abschnitts (16) durch den inneren rohrförmigen Abschnitt (18) definiert ist, und wobei der innere röhrenförmige Abschnitt (18) unterhalb des inneren Durchmesserabschnitts (15) positioniert ist.
  2. Der hermetisch abgedichteter Kompressor (3), wie in Anspruch 1 aufgeführt, ist dadurch gekennzeichnet, dass der Rotorkern (8) einen vergrößerten Innendurchmesser-Abschnitt (17) aufweist, der einen erheblich konstanten und relativ größeren Innendurchmesser für die Aufnahme des Hauptlagers (5) aufweist, wobei mindestens ein Teil des Durchgangslochs (9) innerhalb des Außendurchmesser-Abschnittes (14) ist durch den vergrößerten Innendurchmesser-Abschnitt (17) definiert, und wobei der vergrößerte Innendurchmesser-Abschnitt (17) über dem Innendurchmesser-Abschnitt (15) positioniert ist.
  3. Der hermetisch abgedichteter Kompressor (3), wie in Anspruch 1 oder 2 aufgeführt, ist dadurch gekennzeichnet, dass mindestens ein Teil des Durchgangslochs (9) innerhalb des Außendurchmesser-Abschnittes (14) durch den Innendurchmesser-Abschnitt (15) definiert ist.
  4. Der hermetisch abgedichteter Kompressor (3), wie in einem der Ansprüche 1 bis 4 aufgeführt, ist dadurch gekennzeichnet, dass der innere Rohrabschnitt (18) einen erheblich konstanten und relativ kleineren Innendurchmesser aufweist.
  5. Der hermetisch abgedichteter Kompressor (3), wie in Anspruch 4 aufgeführt, ist dadurch gekennzeichnet, dass er einen Widerlager (19) für das Kontaktieren der Spitze der Kurbelwelle (6) umfasst, wobei das Widerlager (19) durch die Grenzfläche zwischen dem Innendurchmesser-Abschnitt (15) und dem inneren Rohrabschnitt (18) definiert ist.
  6. Der hermetisch abgedichteter Kompressor (3), wie in Anspruch 4 oder 5 aufgeführt, ist dadurch gekennzeichnet, dass der Rotorkern (1) einen Teiler (20) aufweist.
  7. Der hermetisch abgedichteter Kompressor (3), wie in Anspruch 6 aufgeführt, ist dadurch gekennzeichnet, dass der Teiler (20) diametral in dem inneren Rohrabschnitt (18) angeordnet ist.
  8. Der hermetisch abgedichteter Kompressor (3), wie in einem der Ansprüche 1 bis 7 aufgeführt, ist dadurch gekennzeichnet, dass der Rotorkern (8) mehrere gestapelte Lamellen umfasst.
  9. Der hermetisch abgedichteter Kompressor (3), wie in einem der Ansprüche 1 bis 7 aufgeführt, ist dadurch gekennzeichnet, dass der Rotorkern (8) einteilig ist.
  10. Der hermetisch abgedichteter Kompressor (3), wie in Anspruch 9 aufgeführt, ist dadurch gekennzeichnet, dass der Elektromotor (2) unter dem Zylindergehäuse (4) angeordnet ist.
  11. Der hermetisch abgedichteter Kompressor (3), wie in Anspruch 10 aufgeführt, ist dadurch gekennzeichnet, dass die Spitze des erstreckenden Abschnitts (16) in den Schmierstoffsumpf (7) eingetaucht ist.
  12. Ein Kühlgerät, insbesondere ein Haushaltskühlschrank ist durch einen hermetisch abgedichteten Kompressor (3) gekennzeichnet, der in einem der Ansprüche 1 bis 11 aufgeführt ist.
EP14793100.0A 2014-11-03 2014-11-03 Verbesserter rotor zur verwendung in einem elektrischen motor eines hermetischen verdichters Active EP3215737B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14793100T PL3215737T3 (pl) 2014-11-03 2014-11-03 Ulepszony wirnik do stosowania w silniku elektrycznym hermetycznej sprężarki

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/073553 WO2016070898A1 (en) 2014-11-03 2014-11-03 Improved rotor for use in an electric motor of a hermetic compressor

Publications (2)

Publication Number Publication Date
EP3215737A1 EP3215737A1 (de) 2017-09-13
EP3215737B1 true EP3215737B1 (de) 2021-01-06

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EP14793100.0A Active EP3215737B1 (de) 2014-11-03 2014-11-03 Verbesserter rotor zur verwendung in einem elektrischen motor eines hermetischen verdichters

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EP (1) EP3215737B1 (de)
PL (1) PL3215737T3 (de)
WO (1) WO2016070898A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007038443A1 (de) * 2007-08-16 2009-02-19 Danfoss Compressors Gmbh Hermetisch gekapselte Kältemittelverdichtereinrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9201761A (pt) * 1992-05-04 1993-11-09 Brasil Compressores Sa Bomba de oleo para compressor hermetico de velocidade variavel
BR9300797A (pt) * 1993-03-02 1994-10-04 Brasil Compressores Sa Bomba de óleo para compressor hermético de velocidade variável
JP2007255244A (ja) * 2006-03-22 2007-10-04 Matsushita Electric Ind Co Ltd 圧縮機

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007038443A1 (de) * 2007-08-16 2009-02-19 Danfoss Compressors Gmbh Hermetisch gekapselte Kältemittelverdichtereinrichtung

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Publication number Publication date
EP3215737A1 (de) 2017-09-13
PL3215737T3 (pl) 2021-07-12
WO2016070898A1 (en) 2016-05-12

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