US20100215524A1 - Sealed type rotary compressor - Google Patents

Sealed type rotary compressor Download PDF

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Publication number
US20100215524A1
US20100215524A1 US12/688,126 US68812610A US2010215524A1 US 20100215524 A1 US20100215524 A1 US 20100215524A1 US 68812610 A US68812610 A US 68812610A US 2010215524 A1 US2010215524 A1 US 2010215524A1
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US
United States
Prior art keywords
rotary compression
sealed container
rotor
refrigerant
stator
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.)
Abandoned
Application number
US12/688,126
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English (en)
Inventor
Hirotsugu Ogasawara
Takahiro Nishikawa
Yoshihisa Kogure
Kazuhiko Arai
Hiroyuki Yoshida
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Assigned to SANYO ELECTRIC CO., LTD. reassignment SANYO ELECTRIC CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARAI, KAZUHIKO, KOGURE, YOSHIHISA, NISHIKAWA, TAKAHIRO, OGASAWARA, HIROTSUGU, YOSHIDA, HIROYUKI
Publication of US20100215524A1 publication Critical patent/US20100215524A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/026—Lubricant separation
    • 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
    • F04C23/001—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 of similar working principle
    • 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
    • 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
    • F04C29/02—Lubrication; Lubricant separation
    • 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
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
    • F04C18/3562—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation
    • F04C18/3564—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution

Definitions

  • the present invention relates to a sealed type rotary compressor including an electromotive element and a rotary compression element in a sealed container. More particularly, it relates to a sealed type rotary compressor in which a rotary compression element is received in the lower part of a sealed container and in which an electromotive element is received above this rotary compression element, the electromotive element being constituted of a stator, and a rotor rotatably inserted into a magnetic field generated by this stator and fixed to a rotary shaft which also serves as a crank shaft to drive the rotary compression element.
  • this type of sealed type rotary compressor is constituted of a rotary compression element received in the lower part of a sealed container and an electromotive element received above the rotary compression element.
  • the electromotive element is constituted of a ring-shaped stator attached along the inner peripheral surface of the upper space of the sealed container, and rotor rotatably inserted into a magnetic field generated by this stator and fixed to a rotary shaft which also serves as a crank shaft to drive the rotary compression element.
  • the rotary compression element is constituted of a cylinder, a roller fitted into an eccentric portion formed in the rotary shaft to eccentrically rotate in the cylinder, and a vane which abuts on the cylinder to divide the inside of the cylinder into a low pressure chamber side and a high pressure chamber side. Moreover, in the bottom part of the sealed container, oil for lubricating sliding portions such as the rotary compression element and the rotary shaft is stored.
  • the refrigerant gas discharged to the discharge muffler is discharged into the sealed container through discharge holes which connect the discharge muffler to the sealed container and which are directed upwardly to the electromotive element.
  • the oil supplied to the rotary compression element and having a mist state is mixed in the refrigerant gas, and the oil is discharged together with the refrigerant gas into the sealed container.
  • the refrigerant gas discharged into the sealed container passes through a refrigerant passage formed in the electromotive element and is discharged to the outside of a discharge pipe provided above the electromotive element (see e.g., JP-A-9-151885).
  • the present invention has been developed to solve such problems of the conventional technology, and an object thereof is to promote oil separation in the sealed container, thereby decreasing the amount of the oil discharged to the outside of the compressor.
  • a sealed type rotary compressor in which a rotary compression element is received in the lower part of a sealed container and in which an electromotive element is received above this rotary compression element, the electromotive element being constituted of a stator, and a rotor rotatably inserted into a magnetic field generated by this stator and fixed to a rotary shaft which also serves as a crank shaft to drive the rotary compression element,
  • the compressor comprising: a discharge hole provided at positions facing the end surface of the rotor and through which a compressed refrigerant from the rotary compression element is discharged into the sealed container; and a refrigerant flow path which is extended from a space surrounded with a coil end of the stator projecting from the end surface of the rotor to a rotary compression element side to a space of an air gap between the rotor and the stator, to guide the compressed refrigerant discharged through the discharge hole to the electromotive element opposite to the rotary compression element side,
  • the sealed type rotary compressor of a second aspect of the present invention is characterized in that in the above aspect of the present invention, one of openings of the discharge pipe which guides the compressed refrigerant in the sealed container to the outside therefrom is directed to the inside of the ring-shaped refrigerant flow path in the sealed container.
  • the sealed type rotary compressor of a third aspect of the present invention is characterized in that in the second aspect of the present invention, a distance between the end surface of the rotor opposite to the rotary compression element side and the inner wall surface of the sealed container in the direction of the rotary shaft is 25 mm or more.
  • the sealed type rotary compressor in which the rotary compression element is received in the lower part of the sealed container and in which the electromotive element is received above this rotary compression element, the electromotive element being constituted of the stator, and the rotor rotatably inserted into the magnetic field generated by this stator and fixed to the rotary shaft which also serves as the crank shaft to drive the rotary compression element.
  • the compressor comprises the discharge hole provided at the positions facing the end surface of the rotor and through which the compressed refrigerant from the rotary compression element is discharged into the sealed container; and the refrigerant flow path which is extended from the space surrounded with the coil end of the stator projecting from the end surface of the rotor to the rotary compression element side to the space of the air gap between the rotor and the stator, to guide the compressed refrigerant discharged through the discharge hole to the electromotive element opposite to the rotary compression element side, whereby the compressed refrigerant discharged through the discharge hole is caused to collide with the end surface of the rotating rotor, and can be stirred.
  • This can promote oil separation in the space surrounded with the coil end of the stator.
  • the compressed refrigerant guided through the space surrounded with the coil end of the stator is twisted by the wall surfaces of the stator and the rotating rotor, while passing through the space of the air gap between the stator and the rotor, whereby oil can further be separated.
  • the outlet of this refrigerant flow path opposite to the rotary compression element side faces the inner wall surface of the sealed container. Therefore, the refrigerant passing through the refrigerant flow path to reach the electromotive element opposite to the rotary compression element side collides with the inner wall surface of the sealed container, diffuses in the space of the electromotive element opposite to the rotary compression element side, and is then discharged to the outside of the sealed container. In this way, the diffusion in the space of the electromotive element opposite to the rotary compression element side further enables separating the oil. In consequence, the oil separation is efficiently performed, and the oil discharged to the outside of the compressor can noticeably be decreased.
  • one of the openings of the discharge pipe which guides the compressed refrigerant in the sealed container to the outside therefrom is directed to the inside of the ring-shaped refrigerant flow path in the sealed container, whereby the compressed refrigerant which has reached the electromotive element opposite to the rotary compression element side through the refrigerant flow path can be inhibited from directly reaching the discharge pipe.
  • an oil separation performance can be improved.
  • the distance between the end surface of the rotor opposite to the rotary compression element side and the inner wall surface of the sealed container in the direction of the rotary shaft is 25 mm or more.
  • the oil separation space of the electromotive element opposite to the rotary compression element side is sufficiently secured, and the oil separation performance can further be improved.
  • FIG. 1 is a vertically sectional side view schematically showing a sealed type rotary compressor of one embodiment to which the present invention is applied;
  • FIG. 2 is a plan view of a discharge muffler having discharge holes in the sealed type rotary compressor of FIG. 1 ;
  • FIG. 3 is a plan view of another discharge muffler having discharge holes
  • FIG. 4 is a plan view of still another discharge muffler having discharge holes
  • FIG. 5 is a plan view of a further discharge muffler having discharge holes.
  • FIG. 6 is a plan view of a conventional discharge muffler having discharge holes.
  • FIG. 1 is a diagram schematically showing the vertically sectional side surface of an internal high pressure type rotary compressor 1 including first and second rotary compression elements as one embodiment of the sealed type rotary compressor to which the present invention is applied.
  • the rotary compressor 1 of the present embodiment is a two-cylinder sealed type rotary compressor in which a rotary compression mechanism 3 including first and second rotary compression elements 10 , 20 is received in the lower part of the internal space of a vertically cylindrical sealed container 2 formed of a steel plate and in which an electromotive element 4 is received above the rotary compression mechanism.
  • the sealed container 2 is constituted of a container main body 2 A in which the electromotive element 4 and the first and second rotary compression elements 10 , 20 (the rotary compression mechanism 3 ) are received; a substantially bowl-like end cap (a lid member) 2 B which closes an upper opening of this container main body 2 A; and a bottom part 2 C which closes a lower opening of the container main body 2 A.
  • the upper surface of the end cap 2 B is provided with a circular attachment hole (not shown), and in this attachment hole, a terminal (a wiring line is omitted) 35 for supplying a power to the electromotive element 4 positioned in the upper part of the sealed container 2 is attached. Furthermore, in the center of the end cap 2 B, a refrigerant discharge pipe 9 described later is attached.
  • a space in the bottom part of the sealed container 2 is an oil reservoir where oil for lubricating sliding portions such as the first and second rotary compression elements 10 , 20 and a rotary shaft 8 is stored.
  • a mounting base 70 is provided on the external bottom portion of the bottom part 2 C.
  • the rotary compression mechanism 3 is constituted of the first rotary compression element 10 , the second rotary compression element 20 , and an intermediate partition plate 30 sandwiched between both the rotary compression elements 10 and 20 .
  • the first rotary compression element 10 is provided under the intermediate partition plate 30
  • the second rotary compression element 20 is provided above the intermediate partition plate.
  • the first rotary compression element 10 and the second rotary compression element 20 are constituted of cylinders 12 , 22 disposed under and above the intermediate partition plate 30 ; rollers 14 , 24 which are fitted into eccentric portions 13 , 23 provided in the rotary shaft 8 with a phase difference of 180 degrees in the cylinders 12 , 22 , to eccentrically rotate in the cylinders 12 , 22 , respectively; vanes (not shown) which abut on the rollers 14 , 24 to divide the insides of the cylinders 12 , 22 into low pressure chamber sides and high pressure chamber sides, respectively; and a lower support member 15 and an upper support member 25 as support members which close the lower open surface of the cylinder 12 and the upper open surface of the cylinder 22 , respectively, and which also serve as bearings of the rotary shaft 8 .
  • the lower and upper cylinders 12 , 22 are provided with suction passages 16 , 26 which communicate with compression chambers in the cylinders 12 , 22 , respectively.
  • the lower support member 15 opposite to an electromotive element 4 side (the downside) and an electromotive element 4 side (the upside) of the upper support member 25 , discharge mufflers 17 , 27 are provided, respectively.
  • the discharge muffler 17 positioned under the lower support member 15 is formed by covering the lower surface of the lower support member 15 with a substantially bowl-like lower cup 17 A having a center hole through which the rotary shaft 8 and a lower bearing 15 A of the lower support member 15 extend.
  • the discharge muffler 17 is connected to the cylinder 12 through a discharge passage 19 , and a discharge valve 19 V provided in an opening of the discharge passage 19 on a discharge muffler 17 side can closably be opened to connect the discharge muffler 17 to the cylinder 12 (on the high pressure chamber side of the cylinder 12 ).
  • the discharge muffler 27 positioned above the upper support member 25 is formed by covering the upper surface of the upper support member 25 with a substantially bowl-like upper cup 27 A having a center hole through which the rotary shaft 8 and an upper bearing 25 A of the upper support member 25 extend.
  • the discharge muffler 27 is connected to the cylinder 22 through a discharge passage 29 , and a discharge valve 29 V provided in an opening of the discharge passage 29 on a discharge muffler 27 side can closably be opened to connect the discharge muffler 27 to the cylinder 22 (on the high pressure chamber side of the cylinder 22 ).
  • the discharge muffler 17 is connected to the discharge muffler 27 through a communication path (not shown) which extends through the lower support member 15 , the lower cylinder 12 , the intermediate partition plate 30 , the upper cylinder 22 and the upper support member 25 in an axial center direction (a vertical direction).
  • the upper cup 27 A of the discharge muffler 27 is provided with a plurality of discharge holes 28 for discharging a compressed refrigerant from the respective rotary compression elements 10 , 20 into the sealed container 2 .
  • the discharge holes 28 are circular holes extended through the upper cup 27 A in the axial center direction (the vertical direction), and all the discharge holes 28 are formed in the vicinity of the rotary shaft 8 provided in the center of the upper cup 27 A so as to face the end surface (the lower end surface) of rotor 7 of the electromotive element 4 . That is, the discharge holes 28 are directed to the end surface (the lower end surface) of the rotor 7 .
  • the refrigerant gas flows counterclockwise in the discharge muffler 27 of the present embodiment shown in FIG. 2 , and the hole diameters, number and arrangement of the discharge holes 28 are set so that the pulsation of the refrigerant gas can effectively be absorbed (decreased) in the discharge muffler 27 .
  • the discharge holes 28 of the present embodiment shown in FIG. 2 include a discharge hole 28 a having an inner diameter of 10 mm, a discharge hole 28 b disposed substantially symmetrically with respect to the discharge hole 28 a around the rotary shaft 8 , and three discharge holes 28 c each having an inner diameter of 6 mm.
  • the discharge hole 28 b is provided with a facing discharge valve (not shown).
  • reference numeral 49 shown in FIG. 2 indicates slots formed in the upper cup 27 A.
  • a bolt 75 shown in FIG. 1 is a bolt which integrally fixes the upper support member 25 , the upper cylinder 22 , the intermediate partition plate 30 , the lower cylinder 12 and the lower support member 15 .
  • the electromotive element 4 is constituted of a ring-shaped stator 5 fixedly welded along the inner peripheral surface of an upper space of the sealed container 2 ; and the rotor 7 rotatably inserted into a magnetic field generated by the stator 5 .
  • the stator 5 is constituted a stator iron core 36 having a constitution in which stator iron plates formed of substantially ring-shaped electromagnetic steel plates (silicon steel plates) are laminated, and a stator coil (a stator winding) 37 wound around the stator iron core 36 .
  • a coil end 37 E of the stator coil 37 is provided so as to project from the end surface (the lower end surface) of the rotor 7 to a rotary compression mechanism 3 side (the downside), whereby in the end surface (the lower end surface) of the rotor 7 on the rotary compression mechanism 3 side (the downside), a space S 1 surrounded with the coil end 37 E is formed.
  • a plurality of vertical grooves 39 are formed along the inner peripheral surface of the container main body 2 A in the axial center direction, and the vertical grooves 39 are used as passages through which the oil returns as described later.
  • the rotor 7 is constituted of a cylindrical rotor iron core 38 in which a permanent magnet (not shown) formed of an electromagnetic steel plate (a silicon steel plate) is embedded and whose upper and lower end surfaces are flat; and the rotary shaft 8 which is forced and fixedly inserted into a center through hole of the rotor iron core 38 .
  • the rotary shaft 8 which also serves as a crank shaft to drive the first and second rotary compression elements 10 , 20 , passes through the center of the sealed container to extend in the vertical direction, and the upper end of the rotary shaft 8 is positioned at the upper end of the rotor iron core 38 .
  • the lower end of the rotary shaft 8 is positioned in the oil reservoir under the rotary compression mechanism 3 , and immersed into the oil stored in this oil reservoir.
  • the lower portion (the lower end) of the rotary shaft 8 is provided with an oil pump 50 for sucking up the oil from the oil reservoir.
  • the upper and lower end surfaces of the rotor 7 are provided with weight balance adjusting balancers 42 , 43 which suppress vibration generated by the eccentric rotation of the rotary shaft 8 due to the weight differences between the eccentric portions 13 and 23 and between the rollers 14 and 24 in the first and second rotary compression elements 10 , 20 , to stabilize the rotation.
  • weight balance adjusting balancers 42 , 43 which suppress vibration generated by the eccentric rotation of the rotary shaft 8 due to the weight differences between the eccentric portions 13 and 23 and between the rollers 14 and 24 in the first and second rotary compression elements 10 , 20 , to stabilize the rotation.
  • a stop plate 45 for the balancer is provided on the upper surface of the balancer 42 .
  • the members (the balancers 42 , 43 and the stop plate 45 ) arranged on the end surface of the rotor iron core 38 are fixed to the rotor iron core 38 via a rivet 47 .
  • a distance D between the end surface of the rotor 7 opposite to the rotary compression mechanism 3 side and the inner wall surface of the sealed container in the direction of the rotary shaft 8 that is, the distance D between the upper surface of the stop plate 45 provided on the upper end surface of the rotor 7 and the inner wall surface of the end cap 2 B of the sealed container 2 corresponding to and disposed above the upper surface of the stop plate in the present embodiment is 25 mm or more.
  • the electromotive element 4 is provided with a refrigerant flow path through which the compressed refrigerant discharged through the discharge holes 28 (i.e., the discharge holes 28 a , 28 b and 28 c ) to a space A between the rotary compression mechanism 3 and the electromotive element 4 in the sealed container 2 is guided to the electromotive element 4 opposite to the rotary compression mechanism 3 side.
  • This refrigerant flow path is constituted of the space S 1 surrounded with the coil end of the stator 5 projecting from the end surface (the lower end surface) of the rotor 7 to the rotary compression mechanism 3 side (the downside), and a space S 2 of an air gap between the rotor 7 and the stator 5 .
  • the refrigerant discharged through the discharge holes 28 to the space A between the rotary compression mechanism 3 and the electromotive element 4 in the sealed container 2 passes through the space S 1 surrounded with the coil end of the stator 5 projecting from the end surface of the rotor 7 to the rotary compression mechanism 3 side (the downside), passes through the space S 2 of the ring-shaped air gap between the rotor 7 and the stator 5 , and is discharged through an upper end opening (i.e., an outlet of the refrigerant flow path) to a space (i.e., the space of the electromotive element 4 opposite to the rotary compression mechanism 3 side in the sealed container 2 ) B between the inner wall surface of the sealed container 2 and the electromotive element.
  • the outlet of the refrigerant flow path opposite to the rotary compression mechanism 3 side i.e., the upper end opening of the space S 2 of the air gap
  • sleeves 60 , 61 are welded and fixed to positions corresponding to the suction passages 16 , 26 of the cylinders 12 , 22 , respectively. These sleeves 60 , 61 are disposed so as to be vertically adjacent to each other.
  • a refrigerant introduction pipe 40 for introducing the refrigerant gas into the lower cylinder 12 is inserted and connected, and one end of the refrigerant introduction pipe 40 communicates with the suction passage 16 of the lower cylinder 12 .
  • the other end of the refrigerant introduction pipe 40 opens in the upper part of an accumulator 65 .
  • a refrigerant introduction pipe 41 for introducing the refrigerant gas into the upper cylinder 22 is inserted and connected, and one end of the refrigerant introduction pipe 41 communicates with the suction passage 26 of the upper cylinder 22 .
  • the other end of the refrigerant introduction pipe 41 opens in the upper part of the accumulator 65 in the same manner as in the refrigerant introduction pipe 40 .
  • the accumulator 65 is a tank in which the gas-liquid separation of the sucked refrigerant is performed, and is attached to the side surface of the upper part of the container main body 2 A of the sealed container 2 via a bracket 67 . Moreover, the refrigerant introduction pipes 40 and 41 are inserted into the bottom part of the accumulator 65 , and the other end opening of each refrigerant introduction pipe is positioned in the upper part of the accumulator 65 . Furthermore, one end of a refrigerant pipe 68 is inserted into the upper end of the accumulator 65 .
  • the end cap 2 B of the sealed container 2 is provided with a substantially circular center hole 62 at a position facing the rotary shaft 8 .
  • the refrigerant discharge tube 9 is inserted and connected, and one end of the refrigerant discharge tube 9 opens in the upper part of the sealed container 2 .
  • One end opening of the refrigerant discharge tube 9 is directed to the inside of the ring-shaped refrigerant flow path (i.e., the space S 2 of the air gap between the stator 5 and the rotor 7 ).
  • the low pressure refrigerant flows through the refrigerant pipe 68 of the compressor 1 into the accumulator 65 .
  • the low pressure refrigerant which has flowed into the accumulator 65 is subjected to the gas-liquid separation therein, and then the only refrigerant gas enters the refrigerant introduction pipes 40 , 41 disposed in the accumulator 65 .
  • the low pressure refrigerant gas which has entered the refrigerant introduction pipe 40 passes through the suction passage 16 , and is sucked into the low pressure chamber side of the cylinder 12 of the first rotary compression element 10 .
  • the refrigerant gas sucked into the low pressure chamber side of the cylinder 12 is compressed by the operations of the roller 14 and the vane (not shown) to have a high temperature and a high pressure, and the refrigerant gas passes from the high pressure chamber side of the cylinder 12 through the discharge passage 19 , and is discharged to the discharge muffler 17 .
  • the refrigerant gas discharged to the discharge muffler 17 is discharged to the discharge muffler 27 through the communication path (not shown), and joins the refrigerant gas compressed by the second rotary compression element 20 .
  • the low pressure refrigerant gas which has entered the refrigerant introduction pipe 41 passes through the suction passage 26 , and is sucked into the low pressure chamber side of the upper cylinder 22 of the second rotary compression element 20 .
  • the refrigerant gas sucked into the low pressure chamber side of the upper cylinder 22 is compressed by the operations of the roller 24 and the vane (not shown) to have a high temperature and a high pressure, and the refrigerant gas passes from the high pressure chamber side of the upper cylinder 22 through the discharge passage 29 , and is discharged to the discharge muffler 27 to join the refrigerant gas discharged from the first rotary compression element 10 .
  • the joined refrigerant gas is discharged to the space A between the rotary compression mechanism 3 and the electromotive element 4 in the sealed container 2 through the discharge through holes 28 formed in the upper cup 27 A.
  • the oil supplied to the sliding portions of the rotary compression mechanism 3 in the form of mist is mixed in the refrigerant gas, and the oil is discharged together with the refrigerant gas through the discharge holes 28 .
  • arrows shown in FIG. 1 indicate the flow of the oil discharged together with the compressed refrigerant into the sealed container 2 .
  • the discharge holes 28 are provided at the positions facing the lower end surface of the rotor iron core 38 of the rotor 7 , the compressed refrigerant discharged through the discharge holes 28 collides with the lower end surface of the rotor iron core 38 of the rotating rotor 7 , is stirred, and is diffused in the space S 1 surrounded with the coil end 37 E of the stator coil 37 of the stator 5 .
  • a discharge hole 128 a has an inner diameter of 10 mm
  • a discharge hole 128 b has an inner diameter of 8 mm
  • each of discharge holes 128 c has an inner diameter of 6 mm. All the discharge holes are arranged in consideration of the effect of the refrigerant gas pulsation absorption in the discharge muffler 27 . However, all the conventional discharge holes 128 shown in FIG.
  • the compressed refrigerant discharged into the sealed container 2 through the discharge holes 128 directly flows into the space S 2 of the air gap between the rotor 7 and the stator 5 because the discharge holes 128 are directed to the space.
  • another refrigerant flow path for guiding the refrigerant to the electromotive element 4 opposite to the rotary compression mechanism 3 side is formed.
  • the space A extended through the rotor 7 in the axial center direction (the vertical direction) between the rotary compression mechanism 3 and the electromotive element 4 is connected to the space B between the inner wall surface of the sealed container 2 and the electromotive element 4 to form the refrigerant passage, whereby the compressed refrigerant discharged through the discharge holes is guided to this refrigerant passage or the refrigerant passage and space S 2 of the air gap.
  • the compressed refrigerant discharged through the discharge holes is hardly subjected to the oil separation in the space A between the rotary compression mechanism 3 and the electromotive element 4 , but directly flows into the refrigerant flow path for guiding the refrigerant to the electromotive element 4 opposite to the rotary compression mechanism 3 side.
  • the discharge holes 28 are provided so as to face the end surface (the lower end surface) of the rotor iron core 38 of the rotor 7 , whereby the compressed refrigerant discharged into the sealed container 2 through the discharge holes 28 can collide with the lower end surface of the rotor iron core 38 of the rotor 7 directed by the discharge holes 28 .
  • the oil can separated in the space A between the rotary compression mechanism 3 and the electromotive element 4 in the sealed container 2 .
  • the refrigerant when the compressed refrigerant discharged through the discharge holes 28 is caused to collide with the lower end surface of the rotor iron core 38 of the rotating rotor 7 , the refrigerant can be stirred by the rotation of the rotor iron core 38 , and can broadly be diffused over the space S 1 surrounded with the coil end 37 E of the stator coil 37 of the stator 5 . In consequence, the oil separation in the space S 1 surrounded with the coil end 37 E of the stator 5 can be promoted.
  • the refrigerant discharged through the space S 1 passes through the space S 2 of the air gap between the stator 5 and the rotor 7 .
  • the space S 2 of the air gap is a small gap formed between the stator 5 and the rotor 7 .
  • the rotor 7 positioned in the small gap rotates, whereby the refrigerant passing through the space S 2 is influenced by the rotation of the rotor 7 , and flows so as to rise through the space S 2 while being twisted in the rotating direction of the rotor 7 .
  • the oil can further be separated from the refrigerant passing through the space S 2 .
  • this outlet is provided so as to face the inner wall surface of the sealed container 2 , the refrigerant discharged through the outlet collides with the inner wall surface of the sealed container 2 to diffuse in the space B. In this way, the diffusion in the space B of the electromotive element 4 opposite to the rotary compression mechanism 3 side enables further separating the oil.
  • the one end opening of the refrigerant discharge tube 9 for guiding the compressed refrigerant diffused in the space B of the sealed container 2 to the outside of the sealed container 2 is directed to the inside of the ring-shaped refrigerant flow path in the sealed container 2 (i.e., the space S 2 of the air gap), so that the compressed refrigerant which has reached the electromotive element 4 opposite to the rotary compression mechanism 3 side through the refrigerant flow path can be inhibited from directly reaching the refrigerant discharge tube 9 .
  • an oil separation performance can be improved.
  • the distance D between the upper surface of the stop plate 45 provided on the upper end surface of the rotor 7 and the inner wall surface of the end cap 2 B of the sealed container 2 corresponding to and disposed above the stop plate is 25 mm or more, whereby an oil separation space of the electromotive element 4 opposite to the rotary compression mechanism 3 side is sufficiently secured, and the oil separation performance can further be improved.
  • the refrigerant diffused in the space B enters the refrigerant discharge tube 9 through the opening directed to the inside of the refrigerant flow path (the space S 2 of the air gap), and is discharged to the outside of the sealed container 2 .
  • the oil separated from the refrigerant in the space B flows downwardly along the vertical grooves 39 formed between the container main body 2 A of the sealed container 2 and the stator 5 , to return to the oil reservoir in the bottom part of the sealed container 2 .
  • the oil discharged together with the compressed refrigerant into the sealed container 2 can efficiently be separated in the sealed container 2 , and the amount of the oil discharged to the outside of the rotary compressor 1 through the refrigerant discharge tube 9 can noticeably be decreased.
  • the oil can smoothly be supplied to the sliding portions of the rotary compressor 1 , the performance of the rotary compressor 1 is secured, and reliability can be improved.
  • discharge holes 28 there is not any special restriction on the discharge holes as long as they are positioned so as to face the end surface of the rotor.
  • the discharge holes can be provided so as to effectively absorb (decrease) the pulsation of the refrigerant gas in the discharge muffler 27 , there is not any special restriction on the diameters, number, arrangement and the like of the discharge holes 28 of the embodiment shown in FIG. 2 .
  • the diameters, number, arrangement and the like of the discharge holes 28 of the embodiment shown in FIG. 2 there is not any special restriction on the diameters, number, arrangement and the like of the discharge holes 28 of the embodiment shown in FIG. 2 .
  • six discharge holes 28 c each having an inner diameter of 6 mm may equally be spaced from one another and arranged around the rotary shaft 8 .
  • FIG. 3 six discharge holes 28 c each having an inner diameter of 6 mm may equally be spaced from one another and arranged around the rotary shaft 8 .
  • discharge holes 28 b each having an inner diameter of 8 mm and one discharge hole 28 c having an inner diameter of 6 mm may be provided in the vicinity of the rotary shaft 8 .
  • discharge holes may only include a discharge hole 28 a having an inner diameter of 10 mm, and a discharge hole 28 b having an inner diameter of 8 mm and disposed substantially symmetrically with respect to the discharge hole 28 a around the rotary shaft 8 .
  • the present invention applied to the two-cylinder sealed type rotary compressor has been described, but is not limited to the embodiment, and the present invention applied to, for example, a one-cylinder sealed type rotary compressor or a multistage compression type compressor is also effective.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
US12/688,126 2009-02-20 2010-01-15 Sealed type rotary compressor Abandoned US20100215524A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009037815A JP2010190182A (ja) 2009-02-20 2009-02-20 密閉型回転圧縮機
JP2009-037815 2009-02-20

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US20100215524A1 true US20100215524A1 (en) 2010-08-26

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US12/688,126 Abandoned US20100215524A1 (en) 2009-02-20 2010-01-15 Sealed type rotary compressor

Country Status (5)

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US (1) US20100215524A1 (de)
EP (1) EP2221483A2 (de)
JP (1) JP2010190182A (de)
KR (1) KR101164322B1 (de)
CN (1) CN101813091A (de)

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US20140219851A1 (en) * 2012-07-09 2014-08-07 Panasonic Corporation Rotary compressor
CN112761950A (zh) * 2019-11-01 2021-05-07 上海海立电器有限公司 压缩机

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WO2018168044A1 (ja) * 2017-03-15 2018-09-20 東芝キヤリア株式会社 回転式圧縮機および冷凍サイクル装置
CN109915375A (zh) * 2019-04-17 2019-06-21 珠海格力节能环保制冷技术研究中心有限公司 泵体组件及压缩机
WO2021064945A1 (ja) * 2019-10-03 2021-04-08 三菱電機株式会社 密閉型冷媒圧縮機
KR102409626B1 (ko) * 2020-08-19 2022-06-16 엘지전자 주식회사 스크롤 압축기
JP7125637B1 (ja) * 2021-03-16 2022-08-25 ダイキン工業株式会社 圧縮装置及び冷凍装置

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CN101813091A (zh) 2010-08-25
KR20100095359A (ko) 2010-08-30
KR101164322B1 (ko) 2012-07-09
JP2010190182A (ja) 2010-09-02
EP2221483A2 (de) 2010-08-25

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