CA1335986C - Axial and radial supply bores in a scroll compressor - Google Patents
Axial and radial supply bores in a scroll compressorInfo
- Publication number
- CA1335986C CA1335986C CA000616846A CA616846A CA1335986C CA 1335986 C CA1335986 C CA 1335986C CA 000616846 A CA000616846 A CA 000616846A CA 616846 A CA616846 A CA 616846A CA 1335986 C CA1335986 C CA 1335986C
- Authority
- CA
- Canada
- Prior art keywords
- suction chamber
- scroll
- drive shaft
- axial bore
- suction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 230000002265 prevention Effects 0.000 claims abstract description 15
- 239000010687 lubricating oil Substances 0.000 claims abstract description 12
- 238000005192 partition Methods 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims description 19
- 239000003507 refrigerant Substances 0.000 claims description 18
- 230000000694 effects Effects 0.000 claims description 3
- 230000006872 improvement Effects 0.000 claims description 2
- 230000001050 lubricating effect Effects 0.000 abstract description 8
- 238000005461 lubrication Methods 0.000 abstract 1
- 239000000314 lubricant Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 241000412626 Penetes Species 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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- Rotary Pumps (AREA)
Abstract
This invention discloses a lubricating mechanism of a hermeti-cally sealed scroll type compressor in which an inner chamber of a housing is kept at suction pressure. The compressor includes a drive shaft supported by bearings in inner blocks. The drive shaft is opera-tively linked to an orbiting scroll which orbits within a stationary scroll. A rotation prevention device prevents rotation of the orbiting scroll. The drive shaft includes an axial bore extending from an open end and terminating adjacent a forward bearing. A pin extends from the end of the drive shaft to the orbital scroll. A passage links the axial bore to an opening at the end of the pin facing the orbital scroll.
Radial bores are provided near the terminal end of the axial bore and at the rearward end of the axial bore near a rearward bearing. The radial bores link the axial bore to a suction chamber of the compres-sor to allow lubricating oil to lubricate the bearings. The narrow pas-sages allows lubrication of the rotation prevention mechanism. In a second embodiment the suction chamber is divided into two sections by a partition wall. An inclined passage links the two sections to allow the lubricating oil to flow.
Radial bores are provided near the terminal end of the axial bore and at the rearward end of the axial bore near a rearward bearing. The radial bores link the axial bore to a suction chamber of the compres-sor to allow lubricating oil to lubricate the bearings. The narrow pas-sages allows lubrication of the rotation prevention mechanism. In a second embodiment the suction chamber is divided into two sections by a partition wall. An inclined passage links the two sections to allow the lubricating oil to flow.
Description
~- 133S986 AXIAL AND RADIAL SUPPLY BORES IN A SCROLL COMPRESSOR
BACRGROUND OF THE INVENTION
Field of the Invention This invention relates to a scroll type compressor, and more particularly, to a lubricating mechanism for a hermetically sealed scroll type compressor.
BRIEF DE8CRIPTION OF TH~ DRAWING8 Figure 1 is a vertical longitudinal section of a scroll type compressor in accordance with the prior art.
Figure 2 is a vertical longitudinal section of a hermetically sealed scroll type compressor in accordance with a first embodiment of this invention.
Figure 3 is a vertical longitudinal section of a hermetically sealed scroll type compressor in accordance with a second embodiment of this invention.
Description of the Prior Art A hermetically sealed scroll type compressor is disclosed in Japanese Patent Application Publication No.
61-87994 and is shown in Figure 1. A hermetically sealed housing includes inner chamber I which is maintained at discharge pressure. However, the compression mechanism including interfitting scrolls 2 and 3 and the forward end of the drive mechanism are isolated from inner chamber 1 behind partition 4. Channel 5 links intermediate pocket 6 of the interfitting scrolls with chamber 7. Refrigerant gas flows through inlet port 8 and is compressed inwardly by the scrolls towards central pocket 9, and flows to discharge chamber 12 through hole 10 and eventually outlet port 11 to an external element of the refrigeration system.
Some of the refrigerant gas also flows to inner chamber 1.
The intermediate pressure in pocket 6 is maintained in chamber 7 which contains the forward end of the drive mechanism including bearings 14-16. When the compressor operates, lubricating oil mixed with the refrigerant gas, which settles at the bottom of inner chamber 1, flows through channel 13 to lubricate bearings 14-16 of the drive ~r mechanism due to the pressure difference between inner chamber 1, which is maintained at the discharge pressure, and the intermediate pressure.
However, it is difficult to utilize the above type of lubricating mechanism in a hermetically sealed scroll type compressor in which the inner chamber is maintained at the suction pressure. Since the suction pressure is lower than the discharge pressure and the intermediate pressure, the lubricating fluid will not flow to the drive mechanism in this type of compressor.
~UNMARY OF THB INVENTION
It is an object of an aspect of this invention to provide an effective and simplified lubricating mechanism for use in a hermetically sealed scroll type compressor in which an inner chamber of the hermetically sealed housing is maintained at suction pressure.
A compressor according to this invention includes a fixed scroll and an orbiting scroll disposed within a hermetically sealed housing. The fixed scroll includes an end plate from which a first wrap or spiral element extends into the interior of the housing. The end plate of the fixed scroll divides the housing into a discharge chamber and a suction chamber. The first spiral element is located in the suction chamber. An orbiting scroll includes an end plate from which a second wrap or spiral element extends.
The first and second spiral elements interfit at an angular and radial offset to form a plurality of line contacts which define at least one pair of sealed off fluid pockets.
A drive mechanism includes a motor supported in the housing. The drive mechanism is operatively connected to the orbiting scroll to effect orbital motion thereof. A
rotation prevention device prevents the rotation of the orbital scroll during orbital motion so that the volume of the fluid pockets changes to compress the fluid in the pockets inwardly from the outermost pocket towards the central pocket. The compressed gas flows out of the central pocket through a channel in the end plate of the fixed scroll and into a discharge chamber.
The drive mechanism includes a drive shaft supported at both ends by bearings and having an axial bore linked to at least one radial bore leading to the suction chamber.
One end of the drive shaft includes the open end of the axial bore and is located in close proximity to the inlet of the compressor. The other side of the drive shaft extends into a projecting pin forward of the location where the axial bore terminates within the drive shaft. The terminal end of the axial bore is linked to the projecting pin by an offset channel which opens into a chamber adjacent the end plate of the orbiting scroll. The pro-jecting pin extends through a bushing in this chamber. A
further radial bore may be located near the open end of the axial bore of the drive shaft.
In operation, the refrigerant gas includes a lubricating fluid which flows from the axial bore towards the radial bores and the offset channel. The fluid lubricates the bearings supporting the drive shaft as well as a rotation prevention mechanism located at the forward end of the drive shaft.
In a second embodiment, the suction chamber is divided into first and second suction chamber sections by a partition wall. The partition wall completely isolates the two chamber sections with the exception of an inclined bore located below and near the forward end of the drive shaft.
Lubricant fluid settles at the bottom of the first section.
The forward end of the drive shaft including the projecting pin, and the scrolls, are located in the second section of the suction chamber. In operation, the first section of the suction chamber is maintained at a higher pressure than the second section causing the fluid to flow upwardly through the inclined bore to lubricate the rotation prevention device and the forward bearing of the drive shaft.
Other aspects of this invention are as follows:
3a 133~98~
In a scroll type compressor with a hermetically sealed housing, the compressor comprising a fixed scroll disposed within said housing and having a first end plate and a first spiral element extending therefrom, said first end plate of said fixed scroll dividing said housing into a discharge chamber and a suction chamber into which said first spiral element extends an orbiting scroll having a second end plate and a second spiral element extending therefrom, said first and second spiral elements interfitting at an angular and radial offset to form a plurality of line contacts which define at least one pair of sealed off fluid pockets, a drive mechanism operatively connected to said orbiting scroll to effect orbital motion of said orbiting scroll, the axis of rotation of said drive mechanism disposed substantially horizontally when said compressor is disposed on a horizontal surface, rotation prevention means for preventing the rotation of said orbiting scroll during orbital motion whereby the volume of said fluid pockets changes to compress fluid in the pockets, the improvement comprising:
said suction chamber being divided into first and second suction chamber sections by a partition wall, said fixed and orbiting scrolls and said rotation prevention means disposed within said second suction chamber section, said drive mechanism disposed within said first suction chamber section, a refrigerant gas inlet port disposed in said housing at said first suction chamber section, an inclined passage linking said first and second suction chamber sections formed in a lower part of said partition wall, said inclined hole inclined upwardly from said first suction chamber section to said second suction chamber section, wherein lubricating oil separated from refrigerant gas settles at the bottom of said first suction chamber section.
3b 133598~
Further objects, features and other aspects of this invention will be understood from the detailed description of the preferred embodiments of this invention with reference to the annexed drawings.
133~986 DET~ RD DESCRIPTION OF THE PREF~ n EMBODDMENTS
Referring to Figure 2, a hermetically sealed scroll type com-pr~or in accordance with one emho~liment of the present invention is shown. For purposes of expl~nation only, the left side of the Figure will be re~erenced as the forward end or front and the right side of the Figure will be referenced as the rearward end. The compressor includes hermetically sealed casing 10, fixed and orbiting scrolls 20, 30 and motor 40. Fixed scroll 20 includes circular end plate 21 and spiral ~lement or wrap 22 eAlen~llnC from one end (rearward) surface thereof. Fixed scroll 20 is fixedly ~Il.cp(~se.i within a front end portion of casing 10 by a plurality of screws 26. Circular end plate 21 of fixed scroll 20 partitions an inner cham~r of casing 10 into two ch~mb~rs, for ~Y~mple, discharge ch~mher 50 and suction ch~mber 60. O-ring seal 23 h ll~sed between an inner peripheral surface of casing 10 and an outer peripheral surface of circular end plate 21 to seal the mating surfaces o- casing 10 and circular end plate 21.
Orbiting scroll 30 ~ ~sed within suction ch~mber 60 1nclude5 circular end plate 31 and spiral element or wrap 32 eA~e~ na from one end (forward) surface oi circular end plate 31. Spiral element 22 of fixed scroll 20 and spiral elem~nt 32 of orbiting scroll 30 interfit at an angular and radial ofiset to iorm a plurality of linear contacts which de~ine at least one pair o~ sealed off fluid pockets 70. Annular projection 33 is formed at the rearward end surface of circular end plate 31 opposite spiral element 32. Rotation prevention device 34 is cp~ on the outer circumferential surface of ~nnlll~r projection 33 to prevent rotation oi orbiting scroll 30 during orbital motion.
Inner blocks 11, 12 secure stator 41 of motor 40 and are fixedly c~ near opposite ends within suction ch~m~9r 60. Drive shaft 13 axially penet.dtes the centers oi inner blocks 11, 12. Both ends of drive shaft 13 are rotatably supported by inner blocks 11, 12 through bearings 14, 15 respectively. Motor 40 inf~ll)d~s stator 41 and rotor 42 fixedly secured to an outer peripheral suriace o- drive shaft 13. Pin member 16 is integral with and axially projects from the forward end suriace of drive shaft 13 and is radially offset from the axis of drive shaft 13. Bushing 17 is rotatably ~i~p~sed within ~nnlll~r projection -5- 133598~
33 and is supported by bearing 18. Pin member 16 is rotatably inserled in hole 19 of bllchinc 17 which is offset from the center of bl~.ching 17.
Drive shaft 13 is provided with axial bore 81 and a plurality of radial bores 82. Axial bore 81 eAlends from an opening at a first (rearward) end of drive shaft 13, that is, the end opposite pin member 16, to a closed end rearward of pin member 16. Narrow passage 83 links the forward closed end o~ axial bore 81 to an open end surface of pin mpmher 16 adjacent orbiting scroll 30. The plurality of radial bores 82 link axial bore 81 near its closed end to first cavity 61 located between motor 40 and bearing 14. A plurality of further radial bores 84 are located near the openinc Of axial bore 81 adjacent bearing 15. Suction gas inlet pipe 85 is inse. led through the rear end of casing 10 and faces the opening of axial bore 81. Discharge gas outlet pipe 86 is attached to a side wall of casing 10 and links dis-charge ch~ml~r 50 to an external elem~nt.
In operation, stator 41 generates a magnetic field ca~lcing rota-tion of rotor 42, thereby rotating drive shaft 13. This rotation is con-verted to orbital motion of orbiting scroll 30 through bllehinc 17; rota-tional motion is prevented by rotation prevention drive 34. Refriger-ant gas introduced into suction rh~mher 60 through suction gas inlet pipe 85 is taken into the outer sealed fluid ?ockets 70 between fixed scroll 20 and orbiting scroll 30, and moves inwardly towards the cen-ter of spiral elements 22, 32 due to the orbital motion of orbiting scroll 30. As the refrigerant moves towards the central pocket, it under3Oes a resultant volume reduction and compre_sion, and is dis-charged to discharge ch~mhPr 50 through discharge port 24 and one ~.~y valve 25. Discharge gas in discharge ch~mher 50 then flows to an eAtornal fluid circuit (not shown) through discharge gas outlet pipe 86.
The lubricating merh~ni.cm of this eml~iment operates as follows. Refrigerant gas inCIU~IinG lubricating oil (jointly denoted refrigerant gas, hereinafter) is introduced into suction ch~mber 60 from suction gas inlet pipe 85, and is largely taken into axial bore 81.
A large part of the refrigerant gas flows out of axial bore 81, and into first cavity 61 through radial bores 82, and then flows through a gap in bearing 14 into second cavity 62 on the opposite side of bearing 14, rearward of rotation prevention device 34. The remainder of the refrigerant gas in axial bore 81 flows through narrow passage 83 and into the gap bet~.æn b~lchinc 17 and annlllar pro~ection 33. The gas then flows through a gap in bearing 18, and into second cavity 62.
S~h;equently, refrigerant gas in second cavity 62 flows through rota-tion prevention device 34, before being taken into sealed fluid pockets 70. Thus, reffigerant gas effectively flows to lubricate bearing 14, bearing 18 and rotation prevention device 34. Additionally, some lubricant oil is partly separated from the reffigerant gas and remains beneath orbiting scroll 30, while some of the lubricant is taken into sealed fluid pockets 70 as a mist due to orbital motion of orbiting scroll 30. Finally, some of the reffigerant gas flows through the plu-rality of radial bores 84 to further lubricate bearing 15.
Referrfing to Figure 3, a hermetically sealed scroll type com-pr~sor in accordance with a second çmho~iment of the present invention is shown. The same construction is accorded like numerals as shown with respect to Figure 2 and the description of some of the identical elements is substantially omitted.
Inner blocks 110 and 120 secufing stator 41 of motor 40 are fixedly ~llc~ed within suction ~hamher 60. Dfive shaft 13 axially penetrates the center of inner blocks 110 and 120. Inner block 110 may be ~llc~ed pe.yendicularly to the axis of rotation of dfive shaft 13. Both ends of drive shaft 13 are rotatably suppGr~ed by inner blocks 110 and 120 through beafings 14 and 15. The axis of rotation of the drive sha~t is 11icposed parallel to a level surface on which the compr~r is mounted. Inner block 110 divides suction ch~m~xr 60 into first suction chamber section 63 rearward of inner block 110 in which motor 40 is located and second suction chamber section 64 for-ward of inner block 110 in which orbiting scroll 30 and rotation pre-vention merhanicm 34 are located. ~nrlined passaga 111 links first and second suction chamher sections 63, 64 and is formed at a lower part of inner block 110. Inclined hole 111 extends upwardly from first suction chamber 63 towards second suction chamber section 64.
~ 7 ~ 133598~
The lubricating mech~nicm of this embo~llment operates as follows. Refrigerant gas inclu~ing lubricating oil is introduced into first suction ch~ml~r section 63 and is mostly taken into axial bore 81. However, a large part of the reffigerant gas flows into first suc-tion ch~ml~r section 63 from axial bore 81 through a plurality of radial bores 82 and 84 so that lubricating oil is separated from the refrigerant gas due to centrifugal forces and particle interactions and settles at the bottom of first suction ~h~mh~r section 63. Subse quently, refrigerant gas flows into second suction ch~mher section 64 through the gap of bearing 14 so that a small pressure difference is created between first and second suction ch~mhers sections 63 and 64.
The pressure of second suction rh~mhPr section 64 is lower than the pressure Or first suction ch~ml~r section 63. Accordingly, lubricating oil 130 settled at the bottom of first suction ch~m~er section 63 flows to second suction ch~mher section 64 through inClin~d passage 111 to lubricate rotation preventing mech~nicm 34 and a contact portion between fixed and orbiting scrolls 20, 30.
Furllle~ulore~ the open end of inclined pas~age 111 formed at the second suction ch~mbsr section side is located at a position which is higher than the uppe.u-ost level of lubricating oil 130 in the bottom of first suction ch~mh~r section 63 to prevent an overflow of settled lubricating oil 130 to the scrolls when the compr~r is re-started after not operating i'or a long period of time. Therefore, damage to the scrolls is prevented.
This invention has been described in detail in connection with preferred emk~Hments. These em~liments~ ho~ever, are merely for eY~mple only and the invention is not restricted thereto. It will be unde.s~ood by those skilled in the art that other variations and modifi-cations can easily be made within the scope of this invention as defined by the appended claims.
BACRGROUND OF THE INVENTION
Field of the Invention This invention relates to a scroll type compressor, and more particularly, to a lubricating mechanism for a hermetically sealed scroll type compressor.
BRIEF DE8CRIPTION OF TH~ DRAWING8 Figure 1 is a vertical longitudinal section of a scroll type compressor in accordance with the prior art.
Figure 2 is a vertical longitudinal section of a hermetically sealed scroll type compressor in accordance with a first embodiment of this invention.
Figure 3 is a vertical longitudinal section of a hermetically sealed scroll type compressor in accordance with a second embodiment of this invention.
Description of the Prior Art A hermetically sealed scroll type compressor is disclosed in Japanese Patent Application Publication No.
61-87994 and is shown in Figure 1. A hermetically sealed housing includes inner chamber I which is maintained at discharge pressure. However, the compression mechanism including interfitting scrolls 2 and 3 and the forward end of the drive mechanism are isolated from inner chamber 1 behind partition 4. Channel 5 links intermediate pocket 6 of the interfitting scrolls with chamber 7. Refrigerant gas flows through inlet port 8 and is compressed inwardly by the scrolls towards central pocket 9, and flows to discharge chamber 12 through hole 10 and eventually outlet port 11 to an external element of the refrigeration system.
Some of the refrigerant gas also flows to inner chamber 1.
The intermediate pressure in pocket 6 is maintained in chamber 7 which contains the forward end of the drive mechanism including bearings 14-16. When the compressor operates, lubricating oil mixed with the refrigerant gas, which settles at the bottom of inner chamber 1, flows through channel 13 to lubricate bearings 14-16 of the drive ~r mechanism due to the pressure difference between inner chamber 1, which is maintained at the discharge pressure, and the intermediate pressure.
However, it is difficult to utilize the above type of lubricating mechanism in a hermetically sealed scroll type compressor in which the inner chamber is maintained at the suction pressure. Since the suction pressure is lower than the discharge pressure and the intermediate pressure, the lubricating fluid will not flow to the drive mechanism in this type of compressor.
~UNMARY OF THB INVENTION
It is an object of an aspect of this invention to provide an effective and simplified lubricating mechanism for use in a hermetically sealed scroll type compressor in which an inner chamber of the hermetically sealed housing is maintained at suction pressure.
A compressor according to this invention includes a fixed scroll and an orbiting scroll disposed within a hermetically sealed housing. The fixed scroll includes an end plate from which a first wrap or spiral element extends into the interior of the housing. The end plate of the fixed scroll divides the housing into a discharge chamber and a suction chamber. The first spiral element is located in the suction chamber. An orbiting scroll includes an end plate from which a second wrap or spiral element extends.
The first and second spiral elements interfit at an angular and radial offset to form a plurality of line contacts which define at least one pair of sealed off fluid pockets.
A drive mechanism includes a motor supported in the housing. The drive mechanism is operatively connected to the orbiting scroll to effect orbital motion thereof. A
rotation prevention device prevents the rotation of the orbital scroll during orbital motion so that the volume of the fluid pockets changes to compress the fluid in the pockets inwardly from the outermost pocket towards the central pocket. The compressed gas flows out of the central pocket through a channel in the end plate of the fixed scroll and into a discharge chamber.
The drive mechanism includes a drive shaft supported at both ends by bearings and having an axial bore linked to at least one radial bore leading to the suction chamber.
One end of the drive shaft includes the open end of the axial bore and is located in close proximity to the inlet of the compressor. The other side of the drive shaft extends into a projecting pin forward of the location where the axial bore terminates within the drive shaft. The terminal end of the axial bore is linked to the projecting pin by an offset channel which opens into a chamber adjacent the end plate of the orbiting scroll. The pro-jecting pin extends through a bushing in this chamber. A
further radial bore may be located near the open end of the axial bore of the drive shaft.
In operation, the refrigerant gas includes a lubricating fluid which flows from the axial bore towards the radial bores and the offset channel. The fluid lubricates the bearings supporting the drive shaft as well as a rotation prevention mechanism located at the forward end of the drive shaft.
In a second embodiment, the suction chamber is divided into first and second suction chamber sections by a partition wall. The partition wall completely isolates the two chamber sections with the exception of an inclined bore located below and near the forward end of the drive shaft.
Lubricant fluid settles at the bottom of the first section.
The forward end of the drive shaft including the projecting pin, and the scrolls, are located in the second section of the suction chamber. In operation, the first section of the suction chamber is maintained at a higher pressure than the second section causing the fluid to flow upwardly through the inclined bore to lubricate the rotation prevention device and the forward bearing of the drive shaft.
Other aspects of this invention are as follows:
3a 133~98~
In a scroll type compressor with a hermetically sealed housing, the compressor comprising a fixed scroll disposed within said housing and having a first end plate and a first spiral element extending therefrom, said first end plate of said fixed scroll dividing said housing into a discharge chamber and a suction chamber into which said first spiral element extends an orbiting scroll having a second end plate and a second spiral element extending therefrom, said first and second spiral elements interfitting at an angular and radial offset to form a plurality of line contacts which define at least one pair of sealed off fluid pockets, a drive mechanism operatively connected to said orbiting scroll to effect orbital motion of said orbiting scroll, the axis of rotation of said drive mechanism disposed substantially horizontally when said compressor is disposed on a horizontal surface, rotation prevention means for preventing the rotation of said orbiting scroll during orbital motion whereby the volume of said fluid pockets changes to compress fluid in the pockets, the improvement comprising:
said suction chamber being divided into first and second suction chamber sections by a partition wall, said fixed and orbiting scrolls and said rotation prevention means disposed within said second suction chamber section, said drive mechanism disposed within said first suction chamber section, a refrigerant gas inlet port disposed in said housing at said first suction chamber section, an inclined passage linking said first and second suction chamber sections formed in a lower part of said partition wall, said inclined hole inclined upwardly from said first suction chamber section to said second suction chamber section, wherein lubricating oil separated from refrigerant gas settles at the bottom of said first suction chamber section.
3b 133598~
Further objects, features and other aspects of this invention will be understood from the detailed description of the preferred embodiments of this invention with reference to the annexed drawings.
133~986 DET~ RD DESCRIPTION OF THE PREF~ n EMBODDMENTS
Referring to Figure 2, a hermetically sealed scroll type com-pr~or in accordance with one emho~liment of the present invention is shown. For purposes of expl~nation only, the left side of the Figure will be re~erenced as the forward end or front and the right side of the Figure will be referenced as the rearward end. The compressor includes hermetically sealed casing 10, fixed and orbiting scrolls 20, 30 and motor 40. Fixed scroll 20 includes circular end plate 21 and spiral ~lement or wrap 22 eAlen~llnC from one end (rearward) surface thereof. Fixed scroll 20 is fixedly ~Il.cp(~se.i within a front end portion of casing 10 by a plurality of screws 26. Circular end plate 21 of fixed scroll 20 partitions an inner cham~r of casing 10 into two ch~mb~rs, for ~Y~mple, discharge ch~mher 50 and suction ch~mber 60. O-ring seal 23 h ll~sed between an inner peripheral surface of casing 10 and an outer peripheral surface of circular end plate 21 to seal the mating surfaces o- casing 10 and circular end plate 21.
Orbiting scroll 30 ~ ~sed within suction ch~mber 60 1nclude5 circular end plate 31 and spiral element or wrap 32 eA~e~ na from one end (forward) surface oi circular end plate 31. Spiral element 22 of fixed scroll 20 and spiral elem~nt 32 of orbiting scroll 30 interfit at an angular and radial ofiset to iorm a plurality of linear contacts which de~ine at least one pair o~ sealed off fluid pockets 70. Annular projection 33 is formed at the rearward end surface of circular end plate 31 opposite spiral element 32. Rotation prevention device 34 is cp~ on the outer circumferential surface of ~nnlll~r projection 33 to prevent rotation oi orbiting scroll 30 during orbital motion.
Inner blocks 11, 12 secure stator 41 of motor 40 and are fixedly c~ near opposite ends within suction ch~m~9r 60. Drive shaft 13 axially penet.dtes the centers oi inner blocks 11, 12. Both ends of drive shaft 13 are rotatably supported by inner blocks 11, 12 through bearings 14, 15 respectively. Motor 40 inf~ll)d~s stator 41 and rotor 42 fixedly secured to an outer peripheral suriace o- drive shaft 13. Pin member 16 is integral with and axially projects from the forward end suriace of drive shaft 13 and is radially offset from the axis of drive shaft 13. Bushing 17 is rotatably ~i~p~sed within ~nnlll~r projection -5- 133598~
33 and is supported by bearing 18. Pin member 16 is rotatably inserled in hole 19 of bllchinc 17 which is offset from the center of bl~.ching 17.
Drive shaft 13 is provided with axial bore 81 and a plurality of radial bores 82. Axial bore 81 eAlends from an opening at a first (rearward) end of drive shaft 13, that is, the end opposite pin member 16, to a closed end rearward of pin member 16. Narrow passage 83 links the forward closed end o~ axial bore 81 to an open end surface of pin mpmher 16 adjacent orbiting scroll 30. The plurality of radial bores 82 link axial bore 81 near its closed end to first cavity 61 located between motor 40 and bearing 14. A plurality of further radial bores 84 are located near the openinc Of axial bore 81 adjacent bearing 15. Suction gas inlet pipe 85 is inse. led through the rear end of casing 10 and faces the opening of axial bore 81. Discharge gas outlet pipe 86 is attached to a side wall of casing 10 and links dis-charge ch~ml~r 50 to an external elem~nt.
In operation, stator 41 generates a magnetic field ca~lcing rota-tion of rotor 42, thereby rotating drive shaft 13. This rotation is con-verted to orbital motion of orbiting scroll 30 through bllehinc 17; rota-tional motion is prevented by rotation prevention drive 34. Refriger-ant gas introduced into suction rh~mher 60 through suction gas inlet pipe 85 is taken into the outer sealed fluid ?ockets 70 between fixed scroll 20 and orbiting scroll 30, and moves inwardly towards the cen-ter of spiral elements 22, 32 due to the orbital motion of orbiting scroll 30. As the refrigerant moves towards the central pocket, it under3Oes a resultant volume reduction and compre_sion, and is dis-charged to discharge ch~mhPr 50 through discharge port 24 and one ~.~y valve 25. Discharge gas in discharge ch~mher 50 then flows to an eAtornal fluid circuit (not shown) through discharge gas outlet pipe 86.
The lubricating merh~ni.cm of this eml~iment operates as follows. Refrigerant gas inCIU~IinG lubricating oil (jointly denoted refrigerant gas, hereinafter) is introduced into suction ch~mber 60 from suction gas inlet pipe 85, and is largely taken into axial bore 81.
A large part of the refrigerant gas flows out of axial bore 81, and into first cavity 61 through radial bores 82, and then flows through a gap in bearing 14 into second cavity 62 on the opposite side of bearing 14, rearward of rotation prevention device 34. The remainder of the refrigerant gas in axial bore 81 flows through narrow passage 83 and into the gap bet~.æn b~lchinc 17 and annlllar pro~ection 33. The gas then flows through a gap in bearing 18, and into second cavity 62.
S~h;equently, refrigerant gas in second cavity 62 flows through rota-tion prevention device 34, before being taken into sealed fluid pockets 70. Thus, reffigerant gas effectively flows to lubricate bearing 14, bearing 18 and rotation prevention device 34. Additionally, some lubricant oil is partly separated from the reffigerant gas and remains beneath orbiting scroll 30, while some of the lubricant is taken into sealed fluid pockets 70 as a mist due to orbital motion of orbiting scroll 30. Finally, some of the reffigerant gas flows through the plu-rality of radial bores 84 to further lubricate bearing 15.
Referrfing to Figure 3, a hermetically sealed scroll type com-pr~sor in accordance with a second çmho~iment of the present invention is shown. The same construction is accorded like numerals as shown with respect to Figure 2 and the description of some of the identical elements is substantially omitted.
Inner blocks 110 and 120 secufing stator 41 of motor 40 are fixedly ~llc~ed within suction ~hamher 60. Dfive shaft 13 axially penetrates the center of inner blocks 110 and 120. Inner block 110 may be ~llc~ed pe.yendicularly to the axis of rotation of dfive shaft 13. Both ends of drive shaft 13 are rotatably suppGr~ed by inner blocks 110 and 120 through beafings 14 and 15. The axis of rotation of the drive sha~t is 11icposed parallel to a level surface on which the compr~r is mounted. Inner block 110 divides suction ch~m~xr 60 into first suction chamber section 63 rearward of inner block 110 in which motor 40 is located and second suction chamber section 64 for-ward of inner block 110 in which orbiting scroll 30 and rotation pre-vention merhanicm 34 are located. ~nrlined passaga 111 links first and second suction chamher sections 63, 64 and is formed at a lower part of inner block 110. Inclined hole 111 extends upwardly from first suction chamber 63 towards second suction chamber section 64.
~ 7 ~ 133598~
The lubricating mech~nicm of this embo~llment operates as follows. Refrigerant gas inclu~ing lubricating oil is introduced into first suction ch~ml~r section 63 and is mostly taken into axial bore 81. However, a large part of the reffigerant gas flows into first suc-tion ch~ml~r section 63 from axial bore 81 through a plurality of radial bores 82 and 84 so that lubricating oil is separated from the refrigerant gas due to centrifugal forces and particle interactions and settles at the bottom of first suction ~h~mh~r section 63. Subse quently, refrigerant gas flows into second suction ch~mher section 64 through the gap of bearing 14 so that a small pressure difference is created between first and second suction ch~mhers sections 63 and 64.
The pressure of second suction rh~mhPr section 64 is lower than the pressure Or first suction ch~ml~r section 63. Accordingly, lubricating oil 130 settled at the bottom of first suction ch~m~er section 63 flows to second suction ch~mher section 64 through inClin~d passage 111 to lubricate rotation preventing mech~nicm 34 and a contact portion between fixed and orbiting scrolls 20, 30.
Furllle~ulore~ the open end of inclined pas~age 111 formed at the second suction ch~mbsr section side is located at a position which is higher than the uppe.u-ost level of lubricating oil 130 in the bottom of first suction ch~mh~r section 63 to prevent an overflow of settled lubricating oil 130 to the scrolls when the compr~r is re-started after not operating i'or a long period of time. Therefore, damage to the scrolls is prevented.
This invention has been described in detail in connection with preferred emk~Hments. These em~liments~ ho~ever, are merely for eY~mple only and the invention is not restricted thereto. It will be unde.s~ood by those skilled in the art that other variations and modifi-cations can easily be made within the scope of this invention as defined by the appended claims.
Claims (5)
1. In a scroll type compressor with a hermetically sealed housing, the compressor comprising a fixed scroll disposed within said housing and having a first end plate and a first spiral element extending therefrom, said first end plate of said fixed scroll dividing said housing into a discharge chamber and a suction chamber into which said first spiral element extends an orbiting scroll having a second end plate and a second spiral element extending therefrom, said first and second spiral elements interfitting at an angular and radial offset to form a plurality of line contacts which define at least one pair of sealed off fluid pockets, a drive mechanism operatively connected to said orbiting scroll to effect orbital motion of said orbiting scroll, the axis of rotation of said drive mechanism disposed substantially horizontally when said compressor is disposed on a horizontal surface, rotation prevention means for preventing the rotation of said orbiting scroll during orbital motion whereby the volume of said fluid pockets changes to compress fluid in the pockets, the improvement comprising:
said suction chamber being divided into first and second suction chamber sections by a partition wall, said fixed and orbiting scrolls and said rotation prevention means disposed within said second suction chamber section, said drive mechanism disposed within said first suction chamber section, a refrigerant gas inlet port disposed in said housing at said first suction chamber section, an inclined passage linking said first and second suction chamber sections formed in a lower part of said partition wall, said inclined hole inclined upwardly from said first suction chamber section to said second suction chamber section, wherein lubricating oil separated from refrigerant gas settles at the bottom of said first suction chamber section.
said suction chamber being divided into first and second suction chamber sections by a partition wall, said fixed and orbiting scrolls and said rotation prevention means disposed within said second suction chamber section, said drive mechanism disposed within said first suction chamber section, a refrigerant gas inlet port disposed in said housing at said first suction chamber section, an inclined passage linking said first and second suction chamber sections formed in a lower part of said partition wall, said inclined hole inclined upwardly from said first suction chamber section to said second suction chamber section, wherein lubricating oil separated from refrigerant gas settles at the bottom of said first suction chamber section.
2. The hermetically sealed scroll type compressor of Claim 1 wherein said drive mechanism includes a motor supported in said housing, said motor including a rotor secured to said drive shaft.
3. The hermetically sealed scroll type compressor of Claim 1 wherein a drive shaft of said drive mechanism is rotatably supported through said partition wall by a bearing.
4. The hermetically sealed scroll type compressor of Claim 1 wherein one open end of said inclined passage formed at said second suction chamber section side is located at a higher level than the uppermost limit level of the surface of said lubricating oil.
5. The hermetically sealed scroll type compressor of Claim 1 wherein said partition wall is disposed perpendicularly to said axis of rotation of said drive mechanism.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62223080A JPS6466483A (en) | 1987-09-08 | 1987-09-08 | Scroll type compressor |
| JP62-223080 | 1987-09-08 | ||
| JP62223081A JPS6466484A (en) | 1987-09-08 | 1987-09-08 | Lateral type scroll compressor |
| JP62-223081 | 1987-09-08 | ||
| CA000576700A CA1330212C (en) | 1987-09-08 | 1988-09-07 | Axial and radial supply bores in a scroll compressor |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000576700A Division CA1330212C (en) | 1987-09-08 | 1988-09-07 | Axial and radial supply bores in a scroll compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1335986C true CA1335986C (en) | 1995-06-20 |
Family
ID=27168040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000616846A Expired - Fee Related CA1335986C (en) | 1987-09-08 | 1994-03-28 | Axial and radial supply bores in a scroll compressor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1335986C (en) |
-
1994
- 1994-03-28 CA CA000616846A patent/CA1335986C/en not_active Expired - Fee Related
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