EP2530324A2 - Rotary compressor - Google Patents
Rotary compressor Download PDFInfo
- Publication number
- EP2530324A2 EP2530324A2 EP12170385A EP12170385A EP2530324A2 EP 2530324 A2 EP2530324 A2 EP 2530324A2 EP 12170385 A EP12170385 A EP 12170385A EP 12170385 A EP12170385 A EP 12170385A EP 2530324 A2 EP2530324 A2 EP 2530324A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- compressing unit
- copper tube
- injection
- hole
- horizontal hole
- 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.)
- Granted
Links
- 238000002347 injection Methods 0.000 claims abstract description 52
- 239000007924 injection Substances 0.000 claims abstract description 52
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052802 copper Inorganic materials 0.000 claims abstract description 36
- 239000010949 copper Substances 0.000 claims abstract description 36
- 239000003507 refrigerant Substances 0.000 claims abstract description 30
- 238000005192 partition Methods 0.000 claims abstract description 21
- 238000005057 refrigeration Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000006835 compression Effects 0.000 description 12
- 238000007906 compression Methods 0.000 description 12
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 238000003466 welding Methods 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 102220005308 rs33960931 Human genes 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
Images
Classifications
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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
- 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
- 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
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0007—Injection of a fluid in the working chamber for sealing, cooling and lubricating
-
- 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
- F04C2230/00—Manufacture
- F04C2230/60—Assembly methods
-
- 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
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/805—Fastening means, e.g. bolts
-
- 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
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/806—Pipes for fluids; Fittings therefor
Definitions
- a conventional hermetic rotary compressor comprises, in a closed container, a driver and a rotary compression element that is driven by the driver and includes two cylinders.
- Japanese Laid-open Patent Publication No. H7-127575 discloses a conventional technology for cooling such a hermetic rotary compressor, in which a mounting metal piece fixed to an injection copper tube by pressure bonding or welding is positioned precisely to the center in the thickness direction of a partition board between the two cylinders.
- the inner diameter of a vertical through small hole for injection in the partition board is equal to the length to the upper and lower cylinders so that the same amount of refrigerant liquid is injected to the cylinders.
- the mounting metal piece fixed to the injection copper tube is attached to the partition board by screws.
- the mounting metal piece In the conventional technology, if the mounting metal piece is fixed to the injection copper tube by pressure bonding, it cannot be fixed reliably because the injection copper tube is soft. If the mounting metal piece is fixed to the injection copper tube by welding, it cannot also be fixed reliably because the stress concentrates on a welding part due to the vibration of the rotary compressor. Further, the attachment of the mounting metal piece to the partition board with screws increases the cost by screwing.
- a rotary compressor is configured to suck in refrigerant gas from the low pressure side of a refrigeration cycle, compress the refrigerant gas, and discharge the refrigerant gas to the high pressure side of the refrigeration cycle.
- the rotary compressor includes a compressor housing, a first compressing, a second compressing unit, and a partition board.
- the first compressing unit and the second compressing unit are located in the compressor housing, and are arranged one on top of another with the partition board between them.
- the partition board is provided with a vertical hole that is communicated with the first compressing unit and the second compressing unit, and a horizontal hole that is communicated with the vertical hole.
- An injection copper tube to inject a refrigerant liquid to the first compressing unit and the second compressing unit is loose fit in the horizontal hole.
- a columnar injection liner provided with an aperture and having an outer diameter larger than the inner diameter of the injection copper tube is inserted into the injection copper tube from the back end.
- the injection liner is pressed into the injection copper tube up to the front end to increase the diameter of the front end of the injection copper tube, which is loose fit in the horizontal hole, such that the injection copper tube is tight fit in the horizontal hole.
- FIG. 1 is a vertical cross-sectional view of a rotary compressor according to an embodiment.
- FIG. 2 is a horizontal cross-sectional view of first and second compressing units.
- FIG. 3 is a partially enlarged vertical cross-sectional view of a compressing unit of the rotary compressor according to the embodiment.
- FIG. 4 is an enlarged view of a portion A in FIG. 3 .
- a rotary compressor 1 of the embodiment comprises a compressor housing 10, a compressing unit 12, and a motor 11.
- the compressor housing 10 is a vertically placed cylindrical sealed housing.
- the compressing unit 12 is located in the lower part of the compressor housing 10.
- the motor 11 is located in the upper part of the compressor housing 10 and drives the compressing unit 12 via a rotation shaft 15.
- the motor 11 includes a starter 111 and a rotor 112.
- the starter 111 is shrink fit to the inner periphery of the compressor housing 10 to be fixed thereto.
- the rotor 112 is located in the center of the starter 111 and is shrink fit to the rotation shaft 15 to be fixed thereto.
- the rotation shaft 15 mechanically connects between the motor 11 and the compressing unit 12.
- the compressing unit 12 comprises a first compressing unit 12S and a second compressing unit 12T.
- the second compressing unit 12T is located in parallel above the first compressing unit 12S.
- the first compressing unit 12S includes a first cylinder 121S having a first flared portion 122S.
- the second compressing unit 12T includes a second cylinder 121T having a second flared portion 122T.
- the first flared portion 122S is provided with a first inlet 135S, a first vane groove 128S, and a first back-pressure chamber 129S.
- the second flared portion 122T is provided with a second inlet 135T, a second vane groove 128T, and a second back-pressure chamber 129T.
- the first cylinder 121S and the second cylinder 121T have a circular first cylinder inner wall 123S and a circular second cylinder inner wall 123T, respectively, which are formed concentric with the motor 11.
- a first annular piston 125S and a second annular piston 125T are arranged, respectively, which have a smaller outer diameter than the inner diameter of the cylinders.
- a first operation chamber 130S compression space
- a second operation chamber 130T compression space
- the first operation chamber 130S and the second operation chamber 130T compress refrigerant gas sucked therein and discharge the compressed refrigerant gas.
- the first vane groove 128S is formed from the first cylinder inner wall 123S along the radial direction over the height of the first cylinder 121S.
- a flat plate-like first vane 127S is slidably fitted in the first vane groove 128S in an air-tight manner.
- the second vane groove 128T is formed from the second cylinder inner wall 123T along the radial direction over the height of the second cylinder 121T.
- a flat plate-like second vane 127T is slidably fitted in the second vane groove 128T in an air-tight manner.
- a first spring hole 124S and a second spring hole 124T are formed to be communicated with the first vane groove 128S and the second vane groove 128T from the periphery of the first flared portion 122S and the second flared portion 122T, respectively.
- a vane spring (not illustrated) to press the back of the first vane 127S and the second vane 127T.
- the first vane 127S protrudes from the first vane groove 128S into the first operation chamber 130S
- the second vane 127T protrudes from the second vane groove 128T into the second operation chamber 130T.
- the end of the first vane 127S and the second vane 127T comes in contact with the peripheral surface of the first annular piston 125S and the second annular piston 125T.
- the first vane 127S partitions the first operation chamber 130S (compression space) into a first inlet chamber 131S and a first compression chamber 133S.
- the second vane 127T partitions the second operation chamber 130T (compression space) into a second inlet chamber 131T and a second compression chamber 133T.
- the first back-pressure chamber 129S is formed to allow the bottom of the first vane groove 128S to be communicated with the inside of the compressor housing 10 through an opening R illustrated in FIG. 1 to introduce compressed refrigerant gas inside the compressor housing 10.
- the second back-pressure chamber 129T is formed to allow the bottom of the second vane groove 128T to be communicated with the inside of the compressor housing 10 through the opening R to introduce compressed refrigerant gas inside the compressor housing 10.
- the first back-pressure chamber 129S and the second back-pressure chamber 129T apply a back pressure to the first vane 127S and the second vane 127T, respectively, by the pressure of the compressed refrigerant gas.
- the first flared portion 122S of the first cylinder 121S is provided with the first inlet 135S that allows the first inlet chamber 131S to be communicated with the outside so that refrigerant can be sucked into the first inlet chamber 131S from the outside.
- the second flared portion 122T of the second cylinder 121T is provided with the second inlet 135T that allows the second inlet chamber 131T to be communicated with the outside so that refrigerant can be sucked into the second inlet chamber 131T from the outside.
- a partition board 140 is located between the first cylinder 121S and the second cylinder 121T to partition between the first operation chamber 130S of the first cylinder 121S and the second operation chamber 130T of the second cylinder 121T.
- a lower end plate 160S is arranged at the lower end of the first cylinder 121S to close the first operation chamber 130S of the first cylinder 121S.
- an upper end plate 160T is arranged at the upper end of the second cylinder 121T to close the second operation chamber 130T of the second cylinder 121T.
- a lower bearing 161S is formed in the lower end plate 160S.
- the lower bearing 161S rotatably supports a lower-bearing support portion 151 of the rotation shaft 15.
- An upper bearing 161T is formed in the upper end plate 160T.
- the upper bearing 161T rotatably supports an upper-bearing support portion 153 of the rotation shaft 15.
- the rotation shaft 15 is provided with a first eccentric portion 152S and a second eccentric portion 152T, the phases of which are shifted by 180° to be eccentric.
- the first eccentric portion 152S is rotatably fitted to the first annular piston 125S of the first compressing unit 12S.
- the second eccentric portion 152T is rotatably fitted to the second annular piston 125T of the second compressing unit 12T.
- the first annular piston 125S rotates and revolves counterclockwise in FIG. 2 along the first cylinder inner wall 123S in the first cylinder 121S.
- the second annular piston 125T rotates and revolves counterclockwise in FIG. 2 along the second cylinder inner wall 123T in the second cylinder 121T.
- the first vane 127S and the second vane 127T move back and forth.
- the compressing unit 12 continuously sucks in refrigerant gas and compresses it, thereby discharging the compressed refrigerant gas.
- a lower muffler cover 170S is located below the lower end plate 160S such that a lower muffler chamber 180S is formed between the lower end plate 160S and the lower muffler cover 170S.
- the first compressing unit 12S is open to the lower muffler chamber 180S. That is, near the first vane 127S of the lower end plate 160S, there is provided a first outlet 190S (see FIG. 2 ) that allows the first compression chamber 133S of the first cylinder 121S to be communicated with the lower muffler chamber 180S.
- the first outlet 190S is provided with a first outlet valve 200S that prevents the backflow of compressed refrigerant gas.
- the lower muffler chamber 180S is a circular chamber and is part of a communication path that allows the outlet side of the first compressing unit 12S to be communicated with the inside of an upper muffler chamber 180T via a refrigerant path 136 (see FIG. 2 ) passing through the lower end plate 160S, the first cylinder 121S, the partition board 140, the second cylinder 121T, and the upper end plate 160T.
- the lower muffler chamber 180S reduces the pressure pulsation of discharged refrigerant gas.
- a first outlet valve cap 201S and the first outlet valve 200S are fixed one on top of the other by a rivet to control the warping opening amount of the first outlet valve 200S.
- an upper muffler cover 170T is located above the upper end plate 160T such that the upper muffler chamber 180T is formed between the upper end plate 160T and the upper muffler cover 170T.
- a second outlet 190T Near the second vane 127T of the upper end plate 160T, there is provided a second outlet 190T (see FIG. 2 ) that allows the second compression chamber 133T of the second cylinder 121T to be communicated with the upper muffler chamber 180T.
- the second outlet 190T is provided with a second outlet valve 200T that prevents the backflow of compressed refrigerant gas.
- a second outlet valve cap 201T and the second outlet valve 200T are fixed one on top of the other by a rivet to control the warping opening amount of the second outlet valve 200T.
- the upper muffler chamber 180T reduces the pressure pulsation of discharged refrigerant gas.
- the first cylinder 121S, the lower end plate 160S, the lower muffler cover 170S, the second cylinder 121T, the upper end plate 160T, the upper muffler cover 170T, and the partition board 140 are integrally fastened by a bolt 175.
- the compressing unit 12 integrally fastened by the bolt 175 the outer periphery of the upper end plate 160T is fixed to the compressor housing 10 by spot welding, and thereby the compressing unit 12 is fixed to the compressor housing 10.
- a first through hole 101 and a second through hole 102 are formed in this order from the bottom to be separated from each other in the axial direction to let a first inlet tube 104 and a second inlet tube 105 pass therethrough.
- an accumulator 25 formed of an independent cylindrical sealed container is held by an accumulator holder 252 and an accumulator band 253.
- the top center of the accumulator 25 is connected to a system connecting pipe 255 that is connected to the low pressure side of the refrigeration cycle.
- the accumulator 25 is provided with a bottom through hole 257 at the bottom.
- the bottom through hole 257 is connected to a first low-pressure communication tube 31S and a second low-pressure communication tube 31T.
- One end of the first low-pressure communication tube 31S and the second low-pressure communication tube 31T extends to the upside in the accumulator 25, and the other end is connected to an end of the first inlet tube 104 and the second inlet tube 105.
- the first low-pressure communication tube 31S and the second low-pressure communication tube 31T guide the low-pressure refrigerant of the refrigeration cycle to the first compressing unit 12S and the second compressing unit 12T, respectively, via the accumulator 25.
- the first low-pressure communication tube 31S is connected to the first inlet 135S (see FIG. 2 ) of the first cylinder 121S via the first inlet tube 104 as an inlet.
- the second low-pressure communication tube 31T is connected to the second inlet 135T (see FIG. 2 ) of the second cylinder 121T via the second inlet tube 105 as an inlet. That is, the first inlet 135S and the second inlet 135T are communicated in parallel with the low pressure side of the refrigeration cycle.
- the top of the compressor housing 10 is connected to an outlet tube 107 that is connected to the high pressure side of the refrigeration cycle to discharge high-pressure refrigerant gas to the high pressure side of the refrigeration cycle. That is, the first outlet 190S and the second outlet 190T are communicated with the high pressure side of the refrigeration cycle.
- Lubricant oil is enclosed in the compressor housing 10 up to about the height of the second cylinder 121T.
- the lubricant oil circulates in the compressing unit 12 by a vane pump (not illustrated) inserted beneath the rotation shaft 15.
- the lubricant oil seals a portion that partitions the compression space of compressed refrigerant with the lubrication of sliding parts and tiny gaps.
- the partition board 140 is provided with a vertical hole 141 and a horizontal hole 143.
- the vertical hole 141 is communicated with the first operation chamber 130S of the first compressing unit 12S and the second operation chamber 130T of the second compressing unit 12T.
- the horizontal hole 143 is communicated with the vertical hole 141 via a horizontal communication hole 142.
- An front end portion 144a of an injection copper tube 144 for liquid injection is loose fit in the horizontal hole 143.
- the inner diameter of the horizontal communication hole 142 is smaller than that of the horizontal hole 143, and is larger than the inner diameter (for example, 1.0 ⁇ ) of an aperture 145a of an injection liner 145, which will be described later.
- the vertical hole 141 which is located separate from the horizontal hole 143, is communicated with the horizontal hole 143 through the horizontal communication hole 142 having a small inner diameter. Accordingly, the machine work is easier compared to the case where the horizontal hole 143 having a large inner diameter is directly communicated with the vertical hole 141.
- the front end portion 144a of the injection copper tube 144 and an end portion of the injection liner 145 come in contact with an end surface of the horizontal hole 143 and thus are positioned, resulting in effective assembly.
- the front end portion 144a of the injection copper tube 144 passing through the compressor housing 10 is loose fit in the horizontal hole 143.
- the columnar injection liner 145 provided with the aperture 145a and having an outer diameter larger than the inner diameter of the injection copper tube 144 is inserted into the injection copper tube 144 from a back end portion 144b and is pressed up to the front end portion 144a. This increases the diameter of the front end portion 144a of the injection copper tube 144, which is loose fit in the horizontal hole 143, to be tight fit in the horizontal hole 143.
- an injection communication tube 146 is connected to the back end portion 144b of the injection copper tube 144.
- the injection copper tube 144 has an outer diameter a of 6.35 ⁇ , an inner diameter b of 4.75 ⁇ , and a thickness c of 0.8 mm.
- the inner diameter d of the horizontal hole 143 is 6.5 ⁇ (a gap 0.15 mm)
- the outer diameter e of the injection liner 145 is larger than the inner diameter b of the injection copper tube 144 by about 0.2 ⁇ , i.e., 4.95 ⁇
- the front end portion 144a of the injection copper tube 144 is pressure bonded to the horizontal hole 143 (interference 0.05 mm) and can be firmly fixed in an air-tight manner.
- the injection liner 145 is preferably made of an iron-based material (for example, carbon steel S45C, S50C, etc.).
- the aperture 145a (for example, having an inner diameter of 1.0 ⁇ ) of the injection liner 145 prevents an excessive increase in injection amount to the first operation chamber 130S of the first compressing unit 12S and the second operation chamber 130T of the second compressing unit 12T.
- the aperture 145a can serve as a capillary tube as a narrow tube that prevents the backflow of compressed refrigerant.
- the injection copper tube 144 can be reliably fixed to the partition board 140. Moreover, since screw fixing and a capillary tube are not used, the rotary compressor can be obtained at a low cost.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
- The embodiments discussed herein are directed to a rotary compressor.
- A conventional hermetic rotary compressor comprises, in a closed container, a driver and a rotary compression element that is driven by the driver and includes two cylinders. For example, Japanese Laid-open Patent Publication No.
H7-127575 - In the conventional technology, if the mounting metal piece is fixed to the injection copper tube by pressure bonding, it cannot be fixed reliably because the injection copper tube is soft. If the mounting metal piece is fixed to the injection copper tube by welding, it cannot also be fixed reliably because the stress concentrates on a welding part due to the vibration of the rotary compressor. Further, the attachment of the mounting metal piece to the partition board with screws increases the cost by screwing.
- Accordingly, it is an object in one aspect of an embodiment of the invention to provide a rotary compressor, in which the injection copper tube is reliably fixed to the partition board, and which is obtained at a low cost.
- According to an aspect of an embodiment, a rotary compressor is configured to suck in refrigerant gas from the low pressure side of a refrigeration cycle, compress the refrigerant gas, and discharge the refrigerant gas to the high pressure side of the refrigeration cycle. The rotary compressor includes a compressor housing, a first compressing, a second compressing unit, and a partition board. The first compressing unit and the second compressing unit are located in the compressor housing, and are arranged one on top of another with the partition board between them. The partition board is provided with a vertical hole that is communicated with the first compressing unit and the second compressing unit, and a horizontal hole that is communicated with the vertical hole. An injection copper tube to inject a refrigerant liquid to the first compressing unit and the second compressing unit is loose fit in the horizontal hole. After the front end of the injection copper tube is loose fit in the horizontal hole, a columnar injection liner provided with an aperture and having an outer diameter larger than the inner diameter of the injection copper tube is inserted into the injection copper tube from the back end. The injection liner is pressed into the injection copper tube up to the front end to increase the diameter of the front end of the injection copper tube, which is loose fit in the horizontal hole, such that the injection copper tube is tight fit in the horizontal hole.
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FIG. 1 is a vertical cross-sectional view of a rotary compressor according to an embodiment; -
FIG. 2 is a horizontal cross-sectional view of first and second compressing units; -
FIG. 3 is a partially enlarged vertical cross-sectional view of a compressing unit of the rotary compressor according to the embodiment; and -
FIG. 4 is an enlarged view of a portion A inFIG. 3 . - Exemplary embodiments will be described in detail with reference to the accompanying drawings.
-
FIG. 1 is a vertical cross-sectional view of a rotary compressor according to an embodiment.FIG. 2 is a horizontal cross-sectional view of first and second compressing units.FIG. 3 is a partially enlarged vertical cross-sectional view of a compressing unit of the rotary compressor according to the embodiment.FIG. 4 is an enlarged view of a portion A inFIG. 3 . - As illustrated in
FIG. 1 , a rotary compressor 1 of the embodiment comprises acompressor housing 10, acompressing unit 12, and amotor 11. Thecompressor housing 10 is a vertically placed cylindrical sealed housing. The compressingunit 12 is located in the lower part of thecompressor housing 10. Themotor 11 is located in the upper part of thecompressor housing 10 and drives thecompressing unit 12 via arotation shaft 15. - The
motor 11 includes astarter 111 and arotor 112. Thestarter 111 is shrink fit to the inner periphery of thecompressor housing 10 to be fixed thereto. Therotor 112 is located in the center of thestarter 111 and is shrink fit to therotation shaft 15 to be fixed thereto. Therotation shaft 15 mechanically connects between themotor 11 and thecompressing unit 12. - The
compressing unit 12 comprises a firstcompressing unit 12S and a secondcompressing unit 12T. The secondcompressing unit 12T is located in parallel above the first compressingunit 12S. The first compressingunit 12S includes afirst cylinder 121S having a first flaredportion 122S. The second compressingunit 12T includes asecond cylinder 121T having a second flaredportion 122T. The first flaredportion 122S is provided with afirst inlet 135S, afirst vane groove 128S, and a first back-pressure chamber 129S. The second flaredportion 122T is provided with asecond inlet 135T, asecond vane groove 128T, and a second back-pressure chamber 129T. - As illustrated in
FIGS. 1 and2 , thefirst cylinder 121S and thesecond cylinder 121T have a circular first cylinderinner wall 123S and a circular second cylinderinner wall 123T, respectively, which are formed concentric with themotor 11. Inside the first cylinderinner wall 123S and the second cylinderinner wall 123T, a firstannular piston 125S and a secondannular piston 125T are arranged, respectively, which have a smaller outer diameter than the inner diameter of the cylinders. Between the first cylinderinner wall 123S and the firstannular piston 125S, afirst operation chamber 130S (compression space) is formed. Similarly, between the second cylinderinner wall 123T and the secondannular piston 125T, asecond operation chamber 130T (compression space) is formed. Thefirst operation chamber 130S and thesecond operation chamber 130T compress refrigerant gas sucked therein and discharge the compressed refrigerant gas. - In the
first cylinder 121S, thefirst vane groove 128S is formed from the first cylinderinner wall 123S along the radial direction over the height of thefirst cylinder 121S. A flat plate-likefirst vane 127S is slidably fitted in thefirst vane groove 128S in an air-tight manner. In thesecond cylinder 121T, thesecond vane groove 128T is formed from the second cylinderinner wall 123T along the radial direction over the height of thesecond cylinder 121T. A flat plate-likesecond vane 127T is slidably fitted in thesecond vane groove 128T in an air-tight manner. - As illustrated in
FIG. 2 , at the bottom of thefirst vane groove 128S and thesecond vane groove 128T, afirst spring hole 124S and asecond spring hole 124T are formed to be communicated with thefirst vane groove 128S and thesecond vane groove 128T from the periphery of the first flaredportion 122S and the second flaredportion 122T, respectively. In thefirst spring hole 124S and thesecond spring hole 124T is inserted a vane spring (not illustrated) to press the back of thefirst vane 127S and thesecond vane 127T. Usually, by the resilient force of the vane spring, thefirst vane 127S protrudes from thefirst vane groove 128S into thefirst operation chamber 130S, and thesecond vane 127T protrudes from thesecond vane groove 128T into thesecond operation chamber 130T. Accordingly, the end of thefirst vane 127S and thesecond vane 127T comes in contact with the peripheral surface of the firstannular piston 125S and the secondannular piston 125T. Thus, thefirst vane 127S partitions thefirst operation chamber 130S (compression space) into afirst inlet chamber 131S and afirst compression chamber 133S. Similarly, thesecond vane 127T partitions thesecond operation chamber 130T (compression space) into asecond inlet chamber 131T and asecond compression chamber 133T. - Further, in the
first cylinder 121S, the first back-pressure chamber 129S is formed to allow the bottom of thefirst vane groove 128S to be communicated with the inside of thecompressor housing 10 through an opening R illustrated inFIG. 1 to introduce compressed refrigerant gas inside thecompressor housing 10. Similarly, in thesecond cylinder 121T, the second back-pressure chamber 129T is formed to allow the bottom of thesecond vane groove 128T to be communicated with the inside of thecompressor housing 10 through the opening R to introduce compressed refrigerant gas inside thecompressor housing 10. The first back-pressure chamber 129S and the second back-pressure chamber 129T apply a back pressure to thefirst vane 127S and thesecond vane 127T, respectively, by the pressure of the compressed refrigerant gas. - The first flared
portion 122S of thefirst cylinder 121S is provided with thefirst inlet 135S that allows thefirst inlet chamber 131S to be communicated with the outside so that refrigerant can be sucked into thefirst inlet chamber 131S from the outside. The second flaredportion 122T of thesecond cylinder 121T is provided with thesecond inlet 135T that allows thesecond inlet chamber 131T to be communicated with the outside so that refrigerant can be sucked into thesecond inlet chamber 131T from the outside. - As illustrated in
FIG. 1 , apartition board 140 is located between thefirst cylinder 121S and thesecond cylinder 121T to partition between thefirst operation chamber 130S of thefirst cylinder 121S and thesecond operation chamber 130T of thesecond cylinder 121T. Alower end plate 160S is arranged at the lower end of thefirst cylinder 121S to close thefirst operation chamber 130S of thefirst cylinder 121S. Meanwhile, anupper end plate 160T is arranged at the upper end of thesecond cylinder 121T to close thesecond operation chamber 130T of thesecond cylinder 121T. - A
lower bearing 161S is formed in thelower end plate 160S. Thelower bearing 161S rotatably supports a lower-bearingsupport portion 151 of therotation shaft 15. Anupper bearing 161T is formed in theupper end plate 160T. Theupper bearing 161T rotatably supports an upper-bearing support portion 153 of therotation shaft 15. - The
rotation shaft 15 is provided with a firsteccentric portion 152S and a secondeccentric portion 152T, the phases of which are shifted by 180° to be eccentric. The firsteccentric portion 152S is rotatably fitted to the firstannular piston 125S of thefirst compressing unit 12S. The secondeccentric portion 152T is rotatably fitted to the secondannular piston 125T of thesecond compressing unit 12T. - When the
rotation shaft 15 rotates, the firstannular piston 125S rotates and revolves counterclockwise inFIG. 2 along the first cylinderinner wall 123S in thefirst cylinder 121S. Similarly, when therotation shaft 15 rotates, the secondannular piston 125T rotates and revolves counterclockwise inFIG. 2 along the second cylinderinner wall 123T in thesecond cylinder 121T. Along with the movement of the firstannular piston 125S and the secondannular piston 125T, thefirst vane 127S and thesecond vane 127T move back and forth. By the movement of the firstannular piston 125S, the secondannular piston 125T, thefirst vane 127S, and thesecond vane 127T, the volume of thefirst inlet chamber 131S, thesecond inlet chamber 131T, thefirst compression chamber 133S, and thesecond compression chamber 133T continuously changes. As a result, the compressingunit 12 continuously sucks in refrigerant gas and compresses it, thereby discharging the compressed refrigerant gas. - As illustrated in
FIG. 1 , alower muffler cover 170S is located below thelower end plate 160S such that alower muffler chamber 180S is formed between thelower end plate 160S and thelower muffler cover 170S. Thefirst compressing unit 12S is open to thelower muffler chamber 180S. That is, near thefirst vane 127S of thelower end plate 160S, there is provided afirst outlet 190S (seeFIG. 2 ) that allows thefirst compression chamber 133S of thefirst cylinder 121S to be communicated with thelower muffler chamber 180S. Thefirst outlet 190S is provided with afirst outlet valve 200S that prevents the backflow of compressed refrigerant gas. - The
lower muffler chamber 180S is a circular chamber and is part of a communication path that allows the outlet side of thefirst compressing unit 12S to be communicated with the inside of anupper muffler chamber 180T via a refrigerant path 136 (seeFIG. 2 ) passing through thelower end plate 160S, thefirst cylinder 121S, thepartition board 140, thesecond cylinder 121T, and theupper end plate 160T. Thelower muffler chamber 180S reduces the pressure pulsation of discharged refrigerant gas. A firstoutlet valve cap 201S and thefirst outlet valve 200S are fixed one on top of the other by a rivet to control the warping opening amount of thefirst outlet valve 200S. - As illustrated in
FIG. 1 , anupper muffler cover 170T is located above theupper end plate 160T such that theupper muffler chamber 180T is formed between theupper end plate 160T and theupper muffler cover 170T. Near thesecond vane 127T of theupper end plate 160T, there is provided asecond outlet 190T (seeFIG. 2 ) that allows thesecond compression chamber 133T of thesecond cylinder 121T to be communicated with theupper muffler chamber 180T. Thesecond outlet 190T is provided with asecond outlet valve 200T that prevents the backflow of compressed refrigerant gas. - A second
outlet valve cap 201T and thesecond outlet valve 200T are fixed one on top of the other by a rivet to control the warping opening amount of thesecond outlet valve 200T. Theupper muffler chamber 180T reduces the pressure pulsation of discharged refrigerant gas. - The
first cylinder 121S, thelower end plate 160S, thelower muffler cover 170S, thesecond cylinder 121T, theupper end plate 160T, theupper muffler cover 170T, and thepartition board 140 are integrally fastened by abolt 175. Among the compressingunit 12 integrally fastened by thebolt 175, the outer periphery of theupper end plate 160T is fixed to thecompressor housing 10 by spot welding, and thereby the compressingunit 12 is fixed to thecompressor housing 10. - In the outer peripheral wall of the
cylindrical compressor housing 10, a first throughhole 101 and a second throughhole 102 are formed in this order from the bottom to be separated from each other in the axial direction to let afirst inlet tube 104 and asecond inlet tube 105 pass therethrough. Besides, on the outside of thecompressor housing 10, anaccumulator 25 formed of an independent cylindrical sealed container is held by anaccumulator holder 252 and anaccumulator band 253. - The top center of the
accumulator 25 is connected to asystem connecting pipe 255 that is connected to the low pressure side of the refrigeration cycle. Theaccumulator 25 is provided with a bottom throughhole 257 at the bottom. The bottom throughhole 257 is connected to a first low-pressure communication tube 31S and a second low-pressure communication tube 31T. One end of the first low-pressure communication tube 31S and the second low-pressure communication tube 31T extends to the upside in theaccumulator 25, and the other end is connected to an end of thefirst inlet tube 104 and thesecond inlet tube 105. - The first low-
pressure communication tube 31S and the second low-pressure communication tube 31T guide the low-pressure refrigerant of the refrigeration cycle to thefirst compressing unit 12S and thesecond compressing unit 12T, respectively, via theaccumulator 25. The first low-pressure communication tube 31S is connected to thefirst inlet 135S (seeFIG. 2 ) of thefirst cylinder 121S via thefirst inlet tube 104 as an inlet. The second low-pressure communication tube 31T is connected to thesecond inlet 135T (seeFIG. 2 ) of thesecond cylinder 121T via thesecond inlet tube 105 as an inlet. That is, thefirst inlet 135S and thesecond inlet 135T are communicated in parallel with the low pressure side of the refrigeration cycle. - The top of the
compressor housing 10 is connected to anoutlet tube 107 that is connected to the high pressure side of the refrigeration cycle to discharge high-pressure refrigerant gas to the high pressure side of the refrigeration cycle. That is, thefirst outlet 190S and thesecond outlet 190T are communicated with the high pressure side of the refrigeration cycle. - Lubricant oil is enclosed in the
compressor housing 10 up to about the height of thesecond cylinder 121T. The lubricant oil circulates in the compressingunit 12 by a vane pump (not illustrated) inserted beneath therotation shaft 15. Thus, the lubricant oil seals a portion that partitions the compression space of compressed refrigerant with the lubrication of sliding parts and tiny gaps. - With reference to
FIGS. 3 and4 , a description will be given of a salient structure of the rotary compressor 1 according to the embodiment. As illustrated inFIG. 3 , thepartition board 140 is provided with avertical hole 141 and ahorizontal hole 143. Thevertical hole 141 is communicated with thefirst operation chamber 130S of thefirst compressing unit 12S and thesecond operation chamber 130T of thesecond compressing unit 12T. Thehorizontal hole 143 is communicated with thevertical hole 141 via ahorizontal communication hole 142. Anfront end portion 144a of aninjection copper tube 144 for liquid injection is loose fit in thehorizontal hole 143. The inner diameter of thehorizontal communication hole 142 is smaller than that of thehorizontal hole 143, and is larger than the inner diameter (for example, 1.0 φ) of anaperture 145a of aninjection liner 145, which will be described later. Thevertical hole 141, which is located separate from thehorizontal hole 143, is communicated with thehorizontal hole 143 through thehorizontal communication hole 142 having a small inner diameter. Accordingly, the machine work is easier compared to the case where thehorizontal hole 143 having a large inner diameter is directly communicated with thevertical hole 141. Further, at the assembly of theinjection copper tube 144 and theinjection liner 145, thefront end portion 144a of theinjection copper tube 144 and an end portion of theinjection liner 145 come in contact with an end surface of thehorizontal hole 143 and thus are positioned, resulting in effective assembly. - The
front end portion 144a of theinjection copper tube 144 passing through thecompressor housing 10 is loose fit in thehorizontal hole 143. After that, thecolumnar injection liner 145 provided with theaperture 145a and having an outer diameter larger than the inner diameter of theinjection copper tube 144 is inserted into theinjection copper tube 144 from aback end portion 144b and is pressed up to thefront end portion 144a. This increases the diameter of thefront end portion 144a of theinjection copper tube 144, which is loose fit in thehorizontal hole 143, to be tight fit in thehorizontal hole 143. At the assembly of the refrigeration cycle, aninjection communication tube 146 is connected to theback end portion 144b of theinjection copper tube 144. - As illustrated in
FIG. 4 , it is assumed, for example, that theinjection copper tube 144 has an outer diameter a of 6.35 φ, an inner diameter b of 4.75 φ, and a thickness c of 0.8 mm. In this case, if the inner diameter d of thehorizontal hole 143 is 6.5 φ (a gap 0.15 mm), and the outer diameter e of theinjection liner 145 is larger than the inner diameter b of theinjection copper tube 144 by about 0.2 φ, i.e., 4.95 φ, thefront end portion 144a of theinjection copper tube 144 is pressure bonded to the horizontal hole 143 (interference 0.05 mm) and can be firmly fixed in an air-tight manner. - From the aspect of workability and rigidity, the
injection liner 145 is preferably made of an iron-based material (for example, carbon steel S45C, S50C, etc.). Theaperture 145a (for example, having an inner diameter of 1.0 φ) of theinjection liner 145 prevents an excessive increase in injection amount to thefirst operation chamber 130S of thefirst compressing unit 12S and thesecond operation chamber 130T of thesecond compressing unit 12T. Besides, theaperture 145a can serve as a capillary tube as a narrow tube that prevents the backflow of compressed refrigerant. - As described above, according to the embodiment, the
injection copper tube 144 can be reliably fixed to thepartition board 140. Moreover, since screw fixing and a capillary tube are not used, the rotary compressor can be obtained at a low cost.
Claims (3)
- A rotary compressor configured to suck in refrigerant gas from a low pressure side of a refrigeration cycle, compress the refrigerant gas, and discharge the refrigerant gas to a high pressure side of the refrigeration cycle, the rotary compressor comprising:a compressor housing (10);a first compressing unit (12S) in the compressor housing (10);a second compressing unit (12T) in the compressor housing (10), the first compressing unit (12S) and the second compressing unit (12T) being arranged one on top of another; anda partition board (140) between the first compressing unit (12S) and the second compressing unit (12T), whereinthe partition board (140) is provided with a vertical hole (141) that is communicated with the first compressing unit (12S) and the second compressing unit (12T), and a horizontal hole (143) that is communicated with the vertical hole (141),an injection copper tube (144) to inject a refrigerant liquid to the first compressing unit (12S) and the second compressing unit (12T) is loose fit in the horizontal hole (143), andafter a front end (144a) of the injection copper tube (144) is loose fit in the horizontal hole (143), a columnar injection liner (145) provided with an aperture (145a) and having an outer diameter larger than an inner diameter of the injection copper tube (144) is inserted into the injection copper tube (144) from a back end (144b) and is pressed up to the front end (144a) to increase a diameter of the front end (144a) of the injection copper tube (144), which is loose fit in the horizontal hole (143), such that the injection copper tube (144) is tight fit in the horizontal hole (143).
- The rotary compressor according to claim 1, wherein the horizontal hole (143) is communicated with the vertical hole (141) via a horizontal communication hole (142) narrower than the horizontal hole (143).
- The rotary compressor according to claim 1, wherein the injection liner (145) is made of an iron-based material.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011124892A JP2012251485A (en) | 2011-06-03 | 2011-06-03 | Rotary compressor |
Publications (3)
Publication Number | Publication Date |
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EP2530324A2 true EP2530324A2 (en) | 2012-12-05 |
EP2530324A3 EP2530324A3 (en) | 2017-04-12 |
EP2530324B1 EP2530324B1 (en) | 2020-07-15 |
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ID=46197089
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12170385.4A Active EP2530324B1 (en) | 2011-06-03 | 2012-06-01 | Rotary compressor |
Country Status (5)
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US (1) | US20120308425A1 (en) |
EP (1) | EP2530324B1 (en) |
JP (1) | JP2012251485A (en) |
CN (1) | CN102808768B (en) |
AU (1) | AU2012202072B9 (en) |
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US9322405B2 (en) | 2013-10-29 | 2016-04-26 | Emerson Climate Technologies, Inc. | Rotary compressor with vapor injection system |
JP6051936B2 (en) * | 2013-02-26 | 2016-12-27 | 株式会社富士通ゼネラル | Rotary compressor and assembly method thereof |
CN104005958B (en) * | 2013-02-26 | 2017-06-20 | 上海日立电器有限公司 | The anti-injection gas blowby structure of two-spool compressor intermediate plate |
US9513303B2 (en) | 2013-03-15 | 2016-12-06 | Abbott Laboratories | Light-blocking system for a diagnostic analyzer |
JP5786920B2 (en) * | 2013-10-29 | 2015-09-30 | ダイキン工業株式会社 | Compressor and manufacturing method of compressor |
CN105402128A (en) * | 2014-09-12 | 2016-03-16 | 上海日立电器有限公司 | Rotary compressor cylinder structure and air-conditioning system |
CN105156299B (en) * | 2015-08-18 | 2018-08-10 | 珠海格力电器股份有限公司 | Compressor and its assembly technology |
CN105020135A (en) * | 2015-08-18 | 2015-11-04 | 武汉凌达压缩机有限公司 | Refrigerating system and compressor thereof |
JP6578932B2 (en) * | 2015-12-21 | 2019-09-25 | 株式会社富士通ゼネラル | Rotary compressor |
JP6460173B1 (en) * | 2017-07-27 | 2019-01-30 | 株式会社富士通ゼネラル | Rotary compressor |
CN110469510B (en) * | 2018-05-11 | 2021-11-09 | 上海海立电器有限公司 | Compressor |
CZ309303B6 (en) | 2018-08-07 | 2022-08-10 | Mitsubishi Electric Corporation | Rotary compressor and refrigeration cycle equipment |
JP7206506B2 (en) | 2020-10-30 | 2023-01-18 | ダイキン工業株式会社 | rotary compressor |
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-
2011
- 2011-06-03 JP JP2011124892A patent/JP2012251485A/en active Pending
-
2012
- 2012-04-11 AU AU2012202072A patent/AU2012202072B9/en not_active Ceased
- 2012-04-24 US US13/454,704 patent/US20120308425A1/en not_active Abandoned
- 2012-05-31 CN CN201210177207.7A patent/CN102808768B/en not_active Expired - Fee Related
- 2012-06-01 EP EP12170385.4A patent/EP2530324B1/en active Active
Also Published As
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CN102808768B (en) | 2015-05-13 |
US20120308425A1 (en) | 2012-12-06 |
AU2012202072A1 (en) | 2012-12-20 |
AU2012202072B2 (en) | 2014-08-14 |
EP2530324B1 (en) | 2020-07-15 |
CN102808768A (en) | 2012-12-05 |
EP2530324A3 (en) | 2017-04-12 |
AU2012202072B9 (en) | 2014-09-25 |
JP2012251485A (en) | 2012-12-20 |
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