EP1354136B1 - Refrigeration compressor with magnetic coupling - Google Patents
Refrigeration compressor with magnetic coupling Download PDFInfo
- 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
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Images
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.
Abstract
Description
- 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.
- It is known in compressor units for automotive air conditioning systems, which are engine driven, and thus require a clutch mechanism, to utilize an electromagnetic clutch between a belt driven pulley and the compressor.
- It is also known to use magnetic couplings in drives for pumps so as to avoid the necessity of sealing a drive shaft entering the pump chamber. Examples of such arrangements are to be found in U.S. Patents Nos. 3,584,975 (Frohbieter); 3,680,984 (Young et al.); 4,065,234 (Yoshiyuki et al.); and 5,334,004 (Lefevre et al), and in ISOCHEM (Trademark) pumps from Pulsafeeder. Although the first of the patents relates to a circulation pump for an absorption type air conditioning system, the use of a permanent magnet coupling in the drive to the compressor of a compressor type refrigeration unit has not to the best of my knowledge previously been proposed. Reasons may include the sharply fluctuating torque required by piston type compressors normally used in such systems.
- In the interests of smoother and more silent compression, there has been some adoption of scroll type compressors in compression type refrigeration units, available for example from Lennox, Copeland and EDPAC International.
- An alternative form of 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).
- U.S. Patent 5,310,325 (Gulyash discloses a rotary engine using a symmetrical lobed piston moving in a trochoidal chamber on an eccentric mounted on a rotary shaft and driven through a ring gear by a similarly eccentric planet gear rotated at the same rate as the eccentric, the gear ratio of the ring gear to the planet gear being equl to the number of lobes on the rotor, typically three. The apices of the lobes trace trochoidal paths tangent to the trochoidal chamber wall thus simplifying sealing. There is no suggestion that similar principles of construction could be used in a compressor.
- 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.
- In accordance with the invention, there is provided 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 driven element enclosed by the sealed casing and including a plurality of permanent magnets, a driving element of the magnetic coupling outside of the casing in close proximity to the driven element and including a plurality of permanent magnets, and an arrangement for rotating the driving element wherein the driven element and the driving element each include a plurality of magnets are aligned with alternating polarities.
- Preferably 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. Most preferably, the rotor is a three lobed rotor and the gear ratio of the ring gear to the eccentric is three to one.
- Further features of the invention will be apparent from the following description of a presently preferred embodiment thereof.
-
- Figures 1 - 4 are cross-sectional views through a compressor in accordance with the invention, showing different phases of its operation, Figure 1 being a section of the line 1 -1 in Figure 5; and
- Figure 5 is a longitudinal section of the unit on the line 5 - 5 in Figure 1, with the compressor and drive separated for clarity.
- Referring to Figure 5, a compressor 2 comprises a
casing 4 which is completely sealed apart from input andoutput pipes 6 and 8 which connect the compressor 2 respectively to the evaporator and the condenser (not shown) of a refrigeration unit. Athird pipe 10 is used only to charge the unit with refrigerant and is then permanently sealed. Internally thepipes 6 and 8 are connected tochambers casing 4 and astator 16 of the compressor, the chambers being separated bywalls 38. Acompressor drive shaft 18 is journalled inbearings 20 inend walls element 26 of a magnetic coupling which may for example consist of concentric rings ofceramic disc magnets 28 having alternating polarities at their faces adjacent anend plate 30 of thecasing 4. - The
end plate 30 is secured to amotor casing 32 which mounts amotor 34 coupled to adriving element 36 of the magnetic clutch, which is similar to the drivenelement 26 and supports faces of itsmagnets 28 adjacent theend 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 abearing 41 on an eccentric 42 mounted on theshaft 18 for orbital movement along a path within atrochoidal chamber 44 defined within thestator 16, through which path it is driven by aneccentric gear 46 fast on ashaft 48 journalled in thestator 16 by abearing 49, which gear engages aring gear 50 within therotor 40. The rotor is sealed to theend walls ring seals 51. Theshaft 48 is driven by abelt 52 from theshaft 18, and together with theshaft 18 constitutes a rotary drive to therotor 40 such that the eccentric 42 andeccentric 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 thegear 46 are the same. Thestator 16 is formed withports chambers ports 54 may be equipped with spring valves such asreed valves 58 to prevent unwanted reverse flow. - Figure 1 shows the position of the
rotor 40 when the maximum eccentricities of the eccentric 42 andgear 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 oftrochoidal chamber 44. Apex B contacts the wall between thelower ports upper ports lower port 56 into the chamber labeled D, while gas in chamber E is compressed and forced out of the chamber throughlower port 54past valve 58 if its pressure exceeds that inchamber 14. - As the rotor reaches the position shown in Figure 2, apex B moves past
lower port 56 cutting off the induction of gas into chamber D and then apex A moves pastupper port 54 so that gas compressed in chamber D on further motion of the rotor can pass through that port once its pressure exceeds that inchamber 14. At the same time, that portion of the rotor between apices A and C moves away from the stator forming chamber F into which gas is induced throughupper port 56, and pressurized gas continues to be expelled throughlower port 54 from chamber E. - In Figure 3, the position is analogous to that in Figure 1, except that apex A lies between
upper ports lower ports - Particularly if at least one of the rotor and the stator is 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. The compactness of the equipment suits it for use in portable applications such as refrigerated protective clothing.
- 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.
Claims (4)
- A compressor (2) for a refrigeration unit having a sealed casing (4) with at least one inlet port (6) for receiving refrigerant gas and at least one discharge port (8) for discharging compressed refrigerant gas, a stator (16) endosed by the sealed casing and defining a chamber (44) in communication with the at least one inlet port and in communication with the at least one discharge port and a rotor (40) enclosed by the sealed casing, rotor (40) orbiting in said chamber (44) defined within the stator (16) and being in engagement with the stator to cyclically receive refrigerant gas through the at least one inlet port into said chamber, the rotor (40) compressing the refrigerant gas within the stator, and discharging the compressed refrigerant gas through the at least one discharge port, characterised in that the rotor (40) is a multi-lobed rotor (40) orbiting within a trochoidal chamber and having a rotary drive (48, 18) enclosed by the sealed casing and orbiting the rotor (40), a driven element (26) of a magnetic coupling in driving connection with the rotary drive and orbiting the rotor, the driven element enclosed by the sealed casing and including a plurality of permanent magnets (28), a driving element (36) of the magnetic coupling outside of the casing in close proximity to the driven element and including a plurality of permanent magnets (28), and an arrangement (34) for rotating the driving element wherein the driven element and the driving element each include a plurality of magnets are aligned with alternating polarities.
- A compressor (2) according to claim 1, wherein the rotor is joumalled on an eccentric (42) carried by a shaft (18) of the rotary drive (48,18) and has a ring gear (50) driven by an eccentric gear (46), 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.
- A compressor (2) according to claim 2 wherein the rotor is a three lobed rotor and the gear ratio of the ring gear to the eccentric gear being three to one.
- A compressor (2) according to claim 1, wherein the arrangement for rotating the driving element includes an electric motor (34).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2331589 | 2001-01-22 | ||
CA002331589A CA2331589C (en) | 2001-01-22 | 2001-01-22 | Compressor unit for refrigeration |
PCT/CA2002/000058 WO2002057634A1 (en) | 2001-01-22 | 2002-01-17 | Refrigeration compressor with magnetic coupling |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1354136A1 EP1354136A1 (en) | 2003-10-22 |
EP1354136B1 true EP1354136B1 (en) | 2006-05-24 |
Family
ID=4168132
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02709932A Expired - Lifetime EP1354136B1 (en) | 2001-01-22 | 2002-01-17 | Refrigeration compressor with magnetic coupling |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1354136B1 (en) |
AT (1) | ATE327437T1 (en) |
CA (1) | CA2331589C (en) |
DE (1) | DE60211654T2 (en) |
ES (1) | ES2265490T3 (en) |
-
2001
- 2001-01-22 CA CA002331589A patent/CA2331589C/en not_active Expired - Fee Related
-
2002
- 2002-01-17 DE DE60211654T patent/DE60211654T2/en not_active Expired - Lifetime
- 2002-01-17 AT AT02709932T patent/ATE327437T1/en active
- 2002-01-17 ES ES02709932T patent/ES2265490T3/en not_active Expired - Lifetime
- 2002-01-17 EP EP02709932A patent/EP1354136B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE60211654T2 (en) | 2007-05-03 |
DE60211654D1 (en) | 2006-06-29 |
CA2331589A1 (en) | 2002-07-22 |
CA2331589C (en) | 2005-05-24 |
ES2265490T3 (en) | 2007-02-16 |
EP1354136A1 (en) | 2003-10-22 |
ATE327437T1 (en) | 2006-06-15 |
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