EP0505805B1 - Système d'aspiration intégré - Google Patents

Système d'aspiration intégré Download PDF

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Publication number
EP0505805B1
EP0505805B1 EP19920103968 EP92103968A EP0505805B1 EP 0505805 B1 EP0505805 B1 EP 0505805B1 EP 19920103968 EP19920103968 EP 19920103968 EP 92103968 A EP92103968 A EP 92103968A EP 0505805 B1 EP0505805 B1 EP 0505805B1
Authority
EP
European Patent Office
Prior art keywords
suction
cylinder
motor
cylinder head
extending
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
EP19920103968
Other languages
German (de)
English (en)
Other versions
EP0505805A2 (fr
EP0505805A3 (en
Inventor
Nelik I. Dreiman
Robert D. Leffingwell
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.)
Tecumseh Products Co
Original Assignee
Tecumseh Products Co
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Filing date
Publication date
Application filed by Tecumseh Products Co filed Critical Tecumseh Products Co
Publication of EP0505805A2 publication Critical patent/EP0505805A2/fr
Publication of EP0505805A3 publication Critical patent/EP0505805A3/en
Application granted granted Critical
Publication of EP0505805B1 publication Critical patent/EP0505805B1/fr
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
    • 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
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • 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
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/123—Fluid connections

Definitions

  • the present invention relates to hermetic compressors and, more particularly, to a suction system for a hermetic compressor.
  • Hermetic compressors are utilized for circulating a refrigerant gas through a closed refrigerant system.
  • the refrigerant vapor is fed into the interior of the compressor through an intake pipe in the sealed housing defining the compressor.
  • the refrigerant vapor is introduced into a compressor cylinder wherein the vapor is compressed by a piston within the cylinder resulting in an increase in temperature.
  • the vapor exits the cylinder through an exhaust valve, consequently flowing into the discharge portion of the compressor to circulate through the external refrigerant system to return to the compressor unit.
  • hermetic motor compressors employ a shroud over the open end of the motor assembly to attenuate suction noise generated by pressure pulsations produced by the compressor.
  • compressor cylinder heads for handling the gas flow for both the discharge and suction sides are manufactured from cast iron or aluminum to provided side-by-side or adjacent suction and discharge cavities separated by dividing walls which were preferably made as thin as possible to allow a maximum suction and discharge plenum volume in the limited amount of available space.
  • some efforts to overcome the overheating of the suction gas in the cylinder head suction plenum have resulted in tubular liners fabricated from a low thermal conductivity plastic preventing heat transfer to the suction gas, eliminating the suction plenum in the cylinder head and attaching a suction conduit to the relatively thin valve plate, or manufacturing the suction muffler out of a low thermal conductivity plastic.
  • Further arrangements have included utilizing separate discharge and suction cylinder heads for the discharge and suction chambers while the suction cylinder head is formed of a plastic material of low thermal conductivity to minimize heat transfer between the suction and discharge cylinder heads.
  • JP-A-60 73 072 relates to a closed type compressor. To prevent the supercooling of a motor and to reduce as well liquid compression, a first suction passage is provided which cools the motor, and a second suction passage is provided which does not pass through the motor, so that upon low load operation the second suction passage is made effective to suck coolant gas.
  • DE-A-2 951 463 discloses a hermetic compressor, comprising an elongated suction device which has one end providing for a relatively unstrained suction gas flow way, in order to guide suction gas from the interior of a casing into the compressor, further comprising an elongated chamber for the absorption of sound.
  • US-A-4 487 555 discloses a hermetic motor compressor including a closed housing which covers motor and compressor means, and a partition wall which separates a lower temperature compartment in which at least part of a motor is held and a recycling coolant is fed through an inlet port formed on said housing, and a higher temperature compartment in which a compressor and a coolant muffler and a loop part of an outlet pipe are held.
  • the present invention provides, in a compressor, a one-piece integral suction adaptor accommodating suction porting while defining a suction plenum, disposed on a cylinder head defining separate discharge chambers and porting, which draws suction gas from the interior of the compressor housing.
  • the suction adaptor also includes suction porting communicating with a passage in the cylinder block allowing gas to flow through the motor to effect cooling thereof while providing a continuous circulating flow of refrigerant gas into the integral suction adaptor.
  • the present invention in one form thereof, provides a one-piece integral suction adaptor disposed on the cylinder head in which a main portion of the refrigerant gas is drawn from the interior of the compressor housing located in the close proximity of the compressor housing intake pipe, or intermediate suction muffler between the intake pipe and the integral suction adaptor, while another portion of the refrigerant gas is drawn through the motor rotor-stator gap to effect cooling of the motor thereof.
  • the integral suction adaptor is constructed such that there is a continuous flow of the refrigerant gas through the motor rotor-stator gap necessary for motor cooling, and this portion of refrigerant gas combined with the main portion of the refrigerant gas is delivered to one of the cylinders without contacting any hot surface of the cylinder head or other parts.
  • the integral suction adaptor is preferably made from plastic to reduce the transfer of heat from the compressor parts and walls of the housing to the intake refrigerant gas.
  • the exterior walls of the discharge cavities of the cylinder head adjacent to the exterior walls of the suction plenums of the integral suction adaptor are spaced from each other to provide an additional thermal barrier and further reduce suction gas heating in the cavities and passage of the cylinder head and integral suction adaptor.
  • O-rings are disposed in grooves within the space between the exterior walls of the discharge cavities of the cylinder head and the exterior walls of the suction plenums of the integral suction adaptor allowing a press-fit joining of the integral suction adaptor onto the cylinder head providing vibration dampening while effecting sealing.
  • a gas flow system comprises a cylinder head disposed on the valve plate having walls defining a closed discharge chamber, motor cooling means for cooling the motor by flowing refrigerant through said motor, and a low thermal conductivity suction tube defining a suction plenum disposed on said cylinder head having a suction inlet port in fluid communication with the internal low pressure cavity, including an elongate conduit and a first adjutage extending through said cylinder suction opening and extending to the valve plate (but not interfering with it) for bypassing the cylinder head, a motor flowthrough opening communicating with said internal low pressure cavity and adapted to receive refrigerant from the motor cooling means.
  • Compressor 10 includes a sealed compressor housing 12 encapsulating the remainder of the compressor components and defining an internal, low pressure cavity 14. Disposed within housing 12 is a cylinder block 16 supporting a crankshaft 18 which is driven by a motor 20 which includes a stator 22 and rotor 24 each having windings thereon. Shock mounts 34 attached to cylinder block 16 and housing 12 suspend the compressor components within housing 12.
  • orientation of compressor 10 in the illustrated preferred embodiment is with cylinder block 16 suspended vertically beneath motor 20.
  • cylinder block 16 suspended vertically beneath motor 20.
  • other orientations of the compressor components are contemplated and fall within the scope and spirit of the present invention.
  • crankpins 26 and 27 Attached to crankshaft 18 within cylinder block 16 are crankpins 26 and 27, respectively connected to connecting rods 28 and 29, which are in turn respectively connected to pistons 30 and 31, within respective cylinders 32 and 33.
  • the lower end 36 of crankshaft 18 is radially surrounded by bushing 38 in outboard bearing 40 which is fixedly mounted to cylinder block 16 by bearing bolts 42.
  • a valve plate 44 is disposed on the end of cylinders 32 and 33 and supports the suction and discharge valving (not shown) to and from the cylinders.
  • Valve plate 44 includes a suction aperture 46 (Fig. 2) communicating with a cylinder block passage 48 adjacent stator 22 of motor 20.
  • Valve plate 44 also includes cylinder suction apertures 43 and 45 respectively communicating with cylinders 32 and 33.
  • Cylinder block passage 48 communicates with stator/rotor cavity 50 and stator/rotor gap 52 to provide a continuous suction path through the stator/rotor gap 52 effecting cooling of motor 20 and providing an additional suction source.
  • a cylinder head 54 is mounted over valve plate 44 separated by a gasket 56.
  • an integral suction adaptor 58 (to be described in detail hereinbelow) is disposed on cylinder head 54 and is connected to suction muffler 60 by way of suction connector 62.
  • integrally formed in cylinder head 54 are discharge cavities 64 and 65 which communicate with discharge port 66, discharge muffler 67, discharge tube 68, and outlet 69 (see FIG. 1).
  • a pressure relief valve 70 is also in communication with discharge cavities 64 and 65 should excess pressure in cylinder head 54 require venting.
  • integrally formed in cylinder head 54 are cylinder suction openings 72 and 73, and a rotor/stator flowthrough suction opening 74 separated from the high pressure discharge cavities 64 and 65 by cylindrical cylinder head walls 76, 77, and 78 respectively.
  • Cylinder suction openings 72 and 73 are disposed over cylinders 32 and 33, respectively, while rotor/stator flowthrough suction opening 74 is disposed over cylinder block passage 48 so as to allow suction gas entry flowing through motor 20.
  • cylinder head 54 also includes bolt holes 88 in which bolts 89 (shown in FIG. 1) are accommodated in order to secure cylinder head 54 to cylinder block 16.
  • Integral suction adaptor 58 is made from a thermally low conductivity plastic such as Nylon® or Valox®, although other known thermally low conductivity plastics or materials may be utilized, in order to reduce the transfer of heat to the intake refrigerant gas from the compressor parts and walls of the housing.
  • Integral suction adaptor 58 includes suction connector 62 integral with a tubular-like conduit 90 defining a suction plenum.
  • conduit 90 Along the longitudinal length of conduit 90 nearest suction connector 62 is a rotor/stator suction port 92 defined by a circular protruding wall 94 radially extending from conduit 90 and which is adapted to be received through rotor/stator suction opening 74 of cylinder head 54.
  • a rotor/stator suction port 92 defined by a circular protruding wall 94 radially extending from conduit 90 and which is adapted to be received through rotor/stator suction opening 74 of cylinder head 54.
  • two cylinder intake ports 96 and 97 defined by adjutages 98 and 99 radially extending from conduit 90 and which are adapted to be respectively received through cylinder suction openings 72 and 73 of cylinder head 54.
  • the integral suction adaptor 58 cam be modified to accommodate a one cylinder compressor by having only one cylinder intake port defined by one adjutage.
  • integral suction adaptor 58 is coupled to cylinder head 54 by fitting the radially extending ports 92, 96, and 97, which preferably extend (but not interfere) substantially to the surface 49 of valve plate 44, respectively into rotor/stator suction opening 74 and cylinder intake ports 96 and 97, being held into place by O-rings 86, 84, and 85.
  • the integral suction adaptor 58 can be slightly displaced to all sides in a plane perpendicular to the axes of cylinders 32 and 33. This connection feature also facilitates assembly because the integral suction adaptor 58 can be pushed in the cylinder head openings.
  • the integral suction adaptor 58 can also be strapped across the cylinder head.
  • the O-rings also act as damping elements which oppose the transmission of sounds and vibrations from cylinder head 54 to the thinner wall of the integral suction adaptor 58.
  • the O-rings work as sealing elements which separate the interior of the rotor/stator suction port and the cylinder intake ports from the interior compressor cavity 14.
  • compressor 10 During operation of compressor 10, refrigerant enters housing 12 through inlet pipe 100. Because inlet pipe 100 opens into interior cavity 14 of housing 12, the compressor 10 of FIGS. 1 and 2 is a low back pressure compressor operating at suction pressure. The direction of refrigerant flow is depicted by arrows. The main portion of the intake refrigerant gas is drawn into suction muffler 60 and into plenum conduit 90 which is in fluid communication with cylinder intake ports 96 and 97 which are respectively arranged over and in fluid communication with cylinders 32 and 33.
  • integral suction adaptor is in fluid communication with cylinder block passage 48 via suction aperture 46 in valve plate 44 and rotor/stator suction port 72 of the integral suction adaptor 58, a portion of the refrigerant gas is drawn through the stator/rotor gap 52 into the stator/rotor cavity 50 to effect necessary cooling of motor 20, which also provides a continuous flow of refrigerant gas into plenum conduit 90 of the integral suction adaptor 58.

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

Claims (6)

  1. Compresseur hermétique à pistons alternatifs (10), comprenant un carter (12), une cavité intérieure basse pression (14) définie par le carter (12), un bloc de cylindres (16), un vilebrequin (18), une plaque à soupapes (44) disposée sur le bloc de cylindres (16), un moteur (20) comportant un rotor (24) et un stator (22), et un cylindre (32) formé dans le bloc de cylindres (16) en contenant dans celui-ci un piston (30) effectuant un mouvement de va-etvient dans la direction axiale, système de débit de gaz caractérisé par : une culasse (54) disposée sur la plaque à soupapes (44) en se trouvant axialement à l'extérieur du cylindre (32), cette culasse (54) comportant des parois (76, 77, 78) définissant une chambre de décharge fermée (64) en communication de fluide avec le cylindre (32) et un orifice de décharge (66) en communication de fluide avec la chambre de décharge (64), et une ouverture d'aspiration de cylindre (72) disposée axialement vers l'extérieur du cylindre (32) ; des moyens de refroidissement de moteur pour refroidir le moteur (20) en faisant passer du réfrigérant à travers ce moteur (20) ; un tube d'aspiration à faible conductibilité thermique (58) définissant une réserve d'aspiration (90) disposée sur la culasse (54) et comportant une entrée d'aspiration (62) en communication de fluide avec la cavité intérieure basse pression (14), ce tube d'aspiration (58) comprenant un conduit (90) s'étendant transversalement par rapport à la direction axiale du cylindre (32), un premier ajutage (98) s'étendant transversalement par rapport au conduit (90) et traversant l'ouverture d'aspiration (72) du cylindre, une ouverture de passage de débit de moteur (74) communiquant avec la cavité intérieure basse pression et destinée à recevoir du réfrigérant provenant des moyens de refroidissement de moteur, le premier ajutage (98) s'étendant essentiellement jusqu'à la plaque à soupapes (44) pour contourner complètement en by-pass la culasse (54), de façon que le réfrigérant s'écoule directement vers le cylindre (32).
  2. Compresseur hermétique à pistons alternatifs selon la revendication 1, caractérisé en ce que les moyens de refroidissement de moteur comprennent : un passage d'aspiration (48) formé dans le bloc de cylindres (16) au voisinage du stator (22), ce passage d'aspiration (48) étant en communication de fluide avec l'ouverture d'aspiration de passage de débit de moteur (74) ; et un entrefer rotor/stator (50) défini par l'espace compris entre le rotor (24) et le stator (22), cet entrefer (50) étant en communication de fluide à la fois avec la cavité intérieure basse pression (14) et avec le passage d'aspiration (48).
  3. Compresseur hermétique à pistons alternatifs selon la revendication 1, caractérisé en ce que l'ouverture de passage de débit de moteur (74) se trouve dans la culasse (54), et en ce que le tube d'aspiration (58) comprend en outre un second ajutage (94) s'étendant transversalement par rapport au conduit (90) et traversant l'ouverture de passage de débit de moteur (74).
  4. Compresseur hermétique à pistons alternatifs selon la revendication 1, caractérisé en ce que le tube d'aspiration (58) est réalisé dans une matière plastique à faible conductibilité thermique.
  5. Compresseur hermétique à pistons alternatifs selon la revendication 1, caractérisé en ce que les parois (76, 78) définissant l'ouverture d'aspiration de cylindre (72) et l'ouverture d'aspiration de passage de débit de moteur (74), sont définies chacune par une surface comprenant une rainure (80, 82), de façon que des joints toriques (84, 86) soient disposés dans ces rainures (80, 82).
  6. Compresseur hermétique à pistons alternatifs selon la revendication 1, caractérisé en ce que le système d'écoulement de gaz comprend une pluralité des cylindres et une pluralité des premiers ajutages correspondant au nombre des cylindres, ces premiers ajutages s'étendant transversalement par rapport au conduit allongé et passant à travers la pluralité d'ouvertures d'aspiration de cylindres, cette pluralité des premiers ajutages étant dirigée vers la plaque à soupapes mais se terminant juste avant de pénétrer dans la plaque à soupapes pour contourner complètement la culasse, de façon que le réfrigérant s'écoule directement vers la pluralité des cylindres.
EP19920103968 1991-03-28 1992-03-09 Système d'aspiration intégré Expired - Lifetime EP0505805B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US676959 1984-12-03
US67695991A 1991-03-28 1991-03-28

Publications (3)

Publication Number Publication Date
EP0505805A2 EP0505805A2 (fr) 1992-09-30
EP0505805A3 EP0505805A3 (en) 1992-11-25
EP0505805B1 true EP0505805B1 (fr) 1995-03-08

Family

ID=24716725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920103968 Expired - Lifetime EP0505805B1 (fr) 1991-03-28 1992-03-09 Système d'aspiration intégré

Country Status (5)

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EP (1) EP0505805B1 (fr)
JP (1) JPH05126050A (fr)
BR (1) BR9201009A (fr)
CA (1) CA2063942C (fr)
DE (1) DE69201580T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1163668C (zh) * 1996-06-14 2004-08-25 松下冷机株式会社 封闭式压缩机
WO1999011934A1 (fr) 1997-08-29 1999-03-11 Luk Fahrzeug-Hydraulik Gmbh & Co. Kg Compresseur a piston pour agent refrigerant avec isolation thermique
KR102254862B1 (ko) * 2019-10-14 2021-05-24 엘지전자 주식회사 리니어 압축기

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55150880A (en) * 1979-05-11 1980-11-25 Isao Muramatsu Preparation of fish paste product containing fish eggs
DE2951463A1 (de) * 1979-12-20 1981-07-02 Copeland Corp., Sidney, Ohio Kompressoransaugsystem
US4487555A (en) * 1981-02-13 1984-12-11 Mitsubishi Denki Kabushiki Kaisha Hermetic motor compressor
JPS5868753A (ja) * 1981-10-21 1983-04-23 Fuji Photo Film Co Ltd カプセルトナ−
JPS6073072A (ja) * 1983-09-30 1985-04-25 Toshiba Corp 密閉形圧縮機
JPH01121575A (ja) * 1987-11-02 1989-05-15 Matsushita Refrig Co Ltd 密閉型電動圧縮機

Also Published As

Publication number Publication date
DE69201580D1 (de) 1995-04-13
DE69201580T2 (de) 1995-07-06
CA2063942C (fr) 1996-09-10
CA2063942A1 (fr) 1992-09-29
EP0505805A2 (fr) 1992-09-30
EP0505805A3 (en) 1992-11-25
BR9201009A (pt) 1992-11-24
JPH05126050A (ja) 1993-05-21

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