EP1354136B1 - Kältekompressor mit magnetkupplung - Google Patents

Kältekompressor mit magnetkupplung Download PDF

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Publication number
EP1354136B1
EP1354136B1 EP02709932A EP02709932A EP1354136B1 EP 1354136 B1 EP1354136 B1 EP 1354136B1 EP 02709932 A EP02709932 A EP 02709932A EP 02709932 A EP02709932 A EP 02709932A EP 1354136 B1 EP1354136 B1 EP 1354136B1
Authority
EP
European Patent Office
Prior art keywords
rotor
compressor
eccentric
stator
gear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02709932A
Other languages
English (en)
French (fr)
Other versions
EP1354136A1 (de
Inventor
Peter P. M. Randolphi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Randell Technologies Inc
Original Assignee
Randell Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Randell Technologies Inc filed Critical Randell Technologies Inc
Priority claimed from PCT/CA2002/000058 external-priority patent/WO2002057634A1/en
Publication of EP1354136A1 publication Critical patent/EP1354136A1/de
Application granted granted Critical
Publication of EP1354136B1 publication Critical patent/EP1354136B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C29/0064—Magnetic couplings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/22—Rotary-piston pumps specially adapted for elastic fluids of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth equivalents than the outer member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps

Definitions

  • This invention relates to refrigeration compressor units especially but not exclusively units for small refrigeration units such are suitable for use in domestic ice cream makers, small refrigerators and similar appliances. Such units must be compact, quiet, reliable and economical to manufacture and operate.
  • Compressor units for domestic refrigerators are commonly of the sealed unit type in which both the compressor and a motor permanently coupled to the compressor are located within an enclosure which is completely and permanently sealed except for refrigerant connections to the remainder of the refrigeration unit.
  • Such a unit has the disadvantages that failure of either the motor or the compressor requires both to be discarded, different sealed units are required for electrical supplies requiring different motors, even though the compressor is identical, and two devices, both of which generate unwanted heat. are thermally coupled within the same enclosure.
  • piston compressor which has been proposed, although not to the best of my knowledge for refrigeration applications, is the rotary piston compressor using a lobed rotor in a trochoidal chamber and having some superficial resemblance to rotary piston engines such as the Wankel engine although the operating cycle is substantially different and the shaft is driven by an external power source rather than being driven by the rotary piston.
  • Such compressors are exemplified in U.S. Patents Nos. 3, 656,875 (Luck); 4,018,548 (Berkowitz); and 4,487,561 (Eiermann).
  • Swiss Patent No. 274335 describes a compressor specifically designed for household refrigerators. It utilises a rotary piston on an eccentric roller and a continuous one-piece magnet.
  • German Patent No. 2050102 describes a hermetically sealed motor compressor in which the compressor is fabricated as an inside-axle circle piston motor with hidden insert.
  • a compressor for a refrigeration unit having a sealed casing with at least one inlet port for receiving refrigerant gas and at least one discharge port for discharging compressed refrigerant gas, a stator enclosed by the sealed casing and defining a chamber in communication with the at least one inlet port and in communication with the at least one discharge port and a rotor enclosed by the sealed casing, the improvement characterized by the rotor orbiting in said chamber defined within the stator and being in engagement with the stator to cyclically receive refrigerant gas through the at least one inlet port into said chamber, compress the refrigerant gas within the stator, and discharge the compressed refrigerant gas through the at least one discharge port, wherein the rotor is a multi-lobed rotor orbiting within a trochoidal chamber and having a rotary drive enclosed by the sealed casing and orbiting the rotor, a driven element of a magnetic coupling in driving connection with the rotary drive and orbiting the rotor
  • the rotor is joumalled on an eccentric carried by a shaft of the rotary drive and has a ring gear driven by an eccentric gear, the eccentric gear having the same eccentricity as the eccentric and being constrained to rotate in synchronism therewith, the gear ratio of the ring gear to the eccentric gear being equal to the number of lobes on the rotor.
  • the rotor is a three lobed rotor and the gear ratio of the ring gear to the eccentric is three to one.
  • a compressor 2 comprises a casing 4 which is completely sealed apart from input and output pipes 6 and 8 which connect the compressor 2 respectively to the evaporator and the condenser (not shown) of a refrigeration unit.
  • a third pipe 10 is used only to charge the unit with refrigerant and is then permanently sealed.
  • the pipes 6 and 8 are connected to chambers 12 and 14 respectively (see Figs. 1-4) formed between the casing 4 and a stator 16 of the compressor, the chambers being separated by walls 38.
  • a compressor drive shaft 18 is journalled in bearings 20 in end walls 22, 24 of the stator, and carries at one end a driven element 26 of a magnetic coupling which may for example consist of concentric rings of ceramic disc magnets 28 having alternating polarities at their faces adjacent an end plate 30 of the casing 4.
  • the end plate 30 is secured to a motor casing 32 which mounts a motor 34 coupled to a driving element 36 of the magnetic clutch, which is similar to the driven element 26 and supports faces of its magnets 28 adjacent the end plate 30.
  • the coupling may advantageously be designed so that the torque it can transmit is insufficient to apply damaging overloads to the compressor or the motor.
  • the motor may be selected to suit the application. For example alternating or direct current motors for operation at any desired voltage may be utilized, or higher or lower speed motors, or variable speed motors to provide to provide high, low or variable compressor output.
  • the motor need not be electric; for example an internal combustion engine or even a clockwork or manually powered drive could be used. Since the motor is not within the sealed unit, it is simpler to arrange for its cooling, any heat produced can be kept away from the compressor, and the motor can be of cheaper construction, as well as being replaceable.
  • the compressor 2 utilizes features of construction which resemble features of the motor described in U.S. Patent No. 5,310,325.
  • a trilobar rotor 40 is supported by a bearing 41 on an eccentric 42 mounted on the shaft 18 for orbital movement along a path within a trochoidal chamber 44 defined within the stator 16, through which path it is driven by an eccentric gear 46 fast on a shaft 48 journalled in the stator 16 by a bearing 49, which gear engages a ring gear 50 within the rotor 40.
  • the rotor is sealed to the end walls 22, 24 by ring seals 51.
  • the shaft 48 is driven by a belt 52 from the shaft 18, and together with the shaft 18 constitutes a rotary drive to the rotor 40 such that the eccentric 42 and eccentric gear 46 rotate synchronously.
  • the ratio of the ring gear to the eccentric gear is equal to the number of lobes, in this case three, of the rotor, and the eccentricities of the eccentric 42 and the gear 46 are the same.
  • the stator 16 is formed with ports 54 and 56 communicating with the chambers 12 and 14 respectively.
  • the ports 54 may be equipped with spring valves such as reed valves 58 to prevent unwanted reverse flow.
  • Figure 1 shows the position of the rotor 40 when the maximum eccentricities of the eccentric 42 and gear 46 are directed upwardly (as seen in the drawing).
  • the direction of rotation in this example is clockwise, and the apices of the lobes of the rotor are labeled A, B and C for convenient reference.
  • the geometry of the rotor and stator and of the drive are such that the apices remain in contact with the wall of trochoidal chamber 44.
  • Apex B contacts the wall between the lower ports 54 and 56, while the surface of the rotor between apices A and C lies against the chamber wall, obturating the upper ports 54 and 56.
  • gas in chamber E is compressed and forced out of the chamber through lower port 54 past valve 58 if its pressure exceeds that in chamber 14.
  • the rotor and the stator are molded from synthetic plastic, it may be possible to dispense with apex seals, thus further simplifying construction.
  • the use of an external motor means that the latter may also power other functions of apparatus including a refrigeration unit incorporating the compressor, for example mixing paddles in an icecream maker.
  • a refrigeration unit incorporating the compressor, for example mixing paddles in an icecream maker.
  • the compactness of the equipment suits it for use in portable applications such as refrigerated protective clothing.
  • compressor Although a particularly preferred embodiment of compressor has been described, other forms of compressor using rotors orbiting in trochoidal chambers may be utilized, as may scroll compressors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (4)

  1. Kompressor (2) für ein Kühlaggregat, der ein geschlossenes Gehäuse (4) mit mindestens einer Zulauföffnung (6) zur Aufnahme von Kühlgas und mindestens einer Ablauföffnung (8) zum Abfluß von komprimiertem Kühlgas, einen Stator (16), der von dem geschlossenen Gehäuse umschlossen ist und eine Kammer (44) abgrenzt, die mit der zumindest einen Zulauföffnung und mit der zumindest einen Ablauföffnung in Verbindung steht, und einen Rotor (40), der von dem geschlossenen Gehäuse umschlossen ist, aufweist, wobei der Rotor (40) in der Kammer (44), die innerhalb des Stators (16) abgegrenzt ist, kreist, und sich mit dem Stator in Berührungsschluß befindet, damit cyclisch Kühlgas durch die zumindest eine Zulauföffnung in die Kammer aufgenommen wird, wobei der Rotor (40) das Kühlgas innerhalb des Stators verdichtet und das verdichtete Kühlgas durch die zumindest eine Ablauföffnung ausströmt, dadurch gekennzeichnet, daß der Rotor (40) ein mehrlappiger Rotor (40) ist, der innerhalb einer Trochoidalkammer kreist und einen Drehantrieb (48, 18) aufweist, der von dein geschlossenen Gehäuse umschlossen ist und den Rotor (40) umkreist, daß ein angetriebenes Element (26) einer Magnetkupplung in Antriebsverbindung mit dem Drehantrieb steht und den Rotor umkreist, wobei das angetriebene Element von dem geschlossenen Gehäuse umschlossen ist und eine Vielzahl von Dauermagneten (28) umfaßt, daß sich ein Antriebselement (36) der Magnetkupplung außerhalb des Gehäuses in der Nähe des angetriebenen Elements befindet und eine Vielzahl von Dauermagneten (28) und eine Anordnung (34) zum Drehen des Antriebselements umfaßt, wobei das angetriebene Element und das Antriebselement jeweils eine Vielzahl von Magneten umfassen, die mit wechselnden Polaritäten ausgerichtet sind.
  2. Kompressor (2) nach Anspruch 1, wobei der Rotor drehbar an einem Exzenter (42), der von einer Welle (18) des Drehantriebs (48, 18) getragen wird, gelagert ist und einen Zahnkranz (50) aufweist, der von der Exzentersteuerung (46) angetrieben wird, wobei die Exzentersteuerung dieselbe Exzentrizität wie der Exzenter aufweist und zur synchronen Rotation mit dem Exzenter gezwungen wird, wobei das Übersetzungsverhältnis des Zahnkranzes zu der Exzentersteuerung gleich zu der Anzahl von Lappen auf dem Rotor ist.
  3. Kompressor (2) nach Anspruch 2, wobei der Rotor ein dreilappiger Rotor ist und das Übersetzungsverhältnis des Zahnkranzes zu der Exzentersteuerung drei zu eins ist.
  4. Kompressor (2) nach Anspruch 1, wobei die Anordnung zum Drehen des Antriebselements einen elektrischen Motor (34) umfaßt.
EP02709932A 2001-01-22 2002-01-17 Kältekompressor mit magnetkupplung Expired - Lifetime EP1354136B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA002331589A CA2331589C (en) 2001-01-22 2001-01-22 Compressor unit for refrigeration
CA2331589 2001-01-22
PCT/CA2002/000058 WO2002057634A1 (en) 2001-01-22 2002-01-17 Refrigeration compressor with magnetic coupling

Publications (2)

Publication Number Publication Date
EP1354136A1 EP1354136A1 (de) 2003-10-22
EP1354136B1 true EP1354136B1 (de) 2006-05-24

Family

ID=4168132

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02709932A Expired - Lifetime EP1354136B1 (de) 2001-01-22 2002-01-17 Kältekompressor mit magnetkupplung

Country Status (5)

Country Link
EP (1) EP1354136B1 (de)
AT (1) ATE327437T1 (de)
CA (1) CA2331589C (de)
DE (1) DE60211654T2 (de)
ES (1) ES2265490T3 (de)

Also Published As

Publication number Publication date
EP1354136A1 (de) 2003-10-22
CA2331589A1 (en) 2002-07-22
CA2331589C (en) 2005-05-24
DE60211654T2 (de) 2007-05-03
ES2265490T3 (es) 2007-02-16
ATE327437T1 (de) 2006-06-15
DE60211654D1 (de) 2006-06-29

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