EP0538892B1 - Motor driven fluid compressor - Google Patents
Motor driven fluid compressor Download PDFInfo
- Publication number
- EP0538892B1 EP0538892B1 EP92118209A EP92118209A EP0538892B1 EP 0538892 B1 EP0538892 B1 EP 0538892B1 EP 92118209 A EP92118209 A EP 92118209A EP 92118209 A EP92118209 A EP 92118209A EP 0538892 B1 EP0538892 B1 EP 0538892B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive shaft
- bearing means
- axial
- inner race
- axial movement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
Definitions
- This invention relates to a fluid compressor, and more particularly, to a motor driven fluid compressor having the compression and drive mechanisms within a hermetically sealed container.
- Japanese Patent Application Publication No. 1-110891 discloses a compressor including a hermetically sealed housing which contains a compression mechanism, such as a scroll type fluid compression mechanism and a drive mechanism therein as shown In FIG. 1.
- the compressor includes a hermetically sealed casing 1, drive shaft 2, fixed and orbiting scrolls 3 and 4.
- the drive shaft 2 axially penetrates the center of inner block 5 and is rotatably at the center of inner block 5 by hearing 6.
- the forward end of drive shaft 2 forms a balance weight 7.
- a hole 8 is axially formed on the balance weight 7.
- An annular projection 9 is formed on the rearward end surface of a circular end plate 10 of orbiting scroll 4 and is inserted within hole 8.
- the bearing 11 is disposed along the circumference of the inner surface of hole 8 and support annular projection 9 within hole 8.
- the space 12 is formed between the rearward end surface of balance weight 7 and the forward end surface of hearings 6.
- the space 13 is formed between the rearward end surface of annular projection 9 and the bottom and surface of hole 8.
- the annular projection 9 periodically moves forwardly and rearwardly within space 13, and the balance weight 7 periodically moves forwardly and rearwardly within spaces 12 and 13.
- This periodic axial movement of balance weight 7 causes balance weight 7 to repeat the collision with bearings 6. Therefore, the friction between balance weight 7 and bearings 6 occurs, and balance weight 7 and bearings 6 abrades or breaks.
- the friction between the rearward end surface of annular projection 9 and the bottom surface of hole 8 occurs, as a result, balance weight 7 and annular projection 9 abrades or breaks.
- a motor driven fluid compressor comprising the features defined in the preamble of claim 1 is disclosed in document EP-A-0 283 045.
- This compressor comprises an axial movement preventing means for preventing the axial movement of the drive shaft, this movement preventing means being formed by a flange and a nut at the drive shaft, the flange and nut both engaging the inner race of a bearing for the drive shaft. Therefore, both the forward and rearward movements of the drive shaft are prevented by the inner race of said bearing and the bearing therefore receives the axial force which tends to move the drive shaft in either direction.
- the bearing receives axial shearing stress with an excessive frequency so that the life of this bearing and therefore the life of the compressor as a whole is shortened.
- the drive shaft radially forms the projection being in contact with the rearward end of bearing which supports the forward end of the drive shaft in the inner block.
- the ring made of metal is set in the circumference of drive shaft so as to be in contact ring with the forward end of bearing which supports the forward end of drive shaft in inner block.
- the projection prevents drive shaft moving forward
- the ring prevents drive shaft moving rearward.
- the drive shaft radially forms projection being in contact with the forward end of bearing which supports the forward end of drive shaft in inner block.
- the ring made of metal is set in drive shaft so as to be in contact ring with the rearward end of bearing which supports the forward end of drive shaft in inner block.
- the drive shaft radially forms projection being in contact with the forward end of bearing which supports the forward end of drive shaft in inner block.
- the ring made of metal is set in drive shaft so as to be in contact ring with the rearward and of bearing which supports the rearward end of drive shaft in inner block.
- the projection prevents drive shaft moving rearward
- the ring prevents drive shaft moving forward.
- the drive shaft radially forms projection being in contact with forward end of the bearing which supports the rearward end of drive shaft in inner block.
- the ring made of metal is set in drive shaft so as to be in contact ring with the bearing which supports the forward end of drive shaft in inner block.
- the projection prevents drive shaft moving rearward
- the ring prevents drive shaft moving forward.
- the drive shaft radially forms projection being in contact with the forward end of bearing which supports the rearward end of drive shaft
- the ring mode of metal is set in drive shaft so as to be in contact ring with the rearward end of bearing which supports the rearward end of drive shaft in inner block.
- the projection prevents drive shaft moving rearward
- the ring prevents drive shaft moving forward.
- FIG.1 is a vertical longitudinal sectional view of a scroll type compressor in accordance with one prior art.
- FIG.2 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor in accordance with a first embodiment of this invention.
- FIG.3 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor not belonging to this invention.
- FIG .4 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor in accordance with a further embodiment not belonging to this invention.
- FIG.5 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor in accordance with a second embodiment of this invention.
- FIG.6 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor in accordance with a third embodiment of this invention.
- FIG.7 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor not belonging to this invention.
- FIG.2 a hermetically sealed scroll type compressor in accordance with a first embodiment of the present invention is shown.
- the left side of the figure will be referenced as the forward end or front of the compressor and the right side of the figure will be referenced as the rearward end or rear of the compressor.
- the compressor includes hermetically sealed casing 10, fixed and orbiting scrolls 20 and 30, and motor 40.
- Fixed scroll 20 includes circular end plate 21 and spiral element or wrap 22 extending from rearward end surface thereof.
- Fixed scroll 20 is fixedly disposed within a front end portion of casing 10 by a plurality of screws 23.
- Circular end plate 21 of fixed scroll 20 partitions an inner chamber of casing 10 into discharge chamber 50 and suction chamber 60.
- Orbiting scroll 30 is disposed within suction chamber 60, and includes circular end plate 31 and spiral element or wrap 32 extending from forward end surface of circular end plate 31.
- Spiral element 22 of fixed scroll 20 and spiral element 32 of orbiting scroll 30 interfit at an angular and radial offset to form a plurality of linear contacts which define at least one pair of 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 disposed on circumferential surface of annular projection 33 to prevent rotation of orbiting scroll 30 during orbital motion of orbiting scroll 30.
- First and second inner blocks 11 and 12 secure stator 41 of motor 40 and are fixedly disposed near opposite ends within suction chamber 60.
- Drive shaft 13 axially penetrates the centers of inner blocks 11 and 12. Both ends of drive shaft 13 are rotatably supported by inner blocks 11 and 12 through bearings 14 and 15, respectively.
- Motor 40 includes stator 41 and rotor 42 which is fixedly secured to an exterior surface of drive shaft 13.
- Pin member 16 is integral with and axially projects from the forward end surface of drive shaft 13 and is radially offset from the axis of drive shaft 13.
- Balance weight 17 is disposed within a hollow space 61 defined by inner block 11 and the circular end plate 31 of orbiting scroll 30, and is fixedly connected to pin member 16.
- Radial projection 131 is formed at the exterior surface of drive shaft 13 at a position which is rear to bearing 14 so as to continuously contact a rear end surface of inner race 141 of bearing 14 with a front side surface of radial projection 131.
- Annular ridge 132 is formed at the exterior surface of drive shaft 13 at a position which is front of bearing 15 so as to continuously contact the side surface of annular ridge 132 with the front end surface of inner race 151 of bearing 15.
- Drive shaft 13 is provided with axial bore 81 and a plurality of radial bores 82.
- Axial bore 81 extends from an opening at 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 of axial bore 81 to an open end surface of pin member 16 adjacent orbiting scroll 30.
- the plurality of radial bores 82 link axial bore 81 near its closed end to cavity 62 located between motor 40 and hearing 14.
- Suction gas inlet pipe 84 is inserted through the rearward end of casing 10 and faces the opening of axial bore 81.
- Discharge gas outlet pipe attached to a side wall of casing 10 and links discharge chamber 50 to an external element.
- stator 41 In operation, stator 41 generates a magnetic field causing rotation of rotor 42, thereby rotating drive shaft 13. This rotation is connected to orbital motion of orbiting scroll 30 through balance weight 17. Rotational motion of orbiting scroll 30 is prevented by rotation prevention drive 34.
- Refrigerant gas introduced into suction chamber 60 through suction gas inlet pipe 84 is taken into the outer sealed fluid pockets 70 between fixed scroll 20 and orbiting scroll 30, and moves inwardly towards the center of spiral elements 22 and 32 due to the orbital motion of orbiting scroll 30. As the refrigerant moves towards the central pockets, it undergoes a resultant volume reduction and compressor, and is discharged to discharge chamber 50 through valved discharge port 24. Discharge gas in discharge chamber 50 then flows to an external fluid circuit (not shown) through discharge gas outlet pipe 85.
- the preventing mechanism for preventing the axial movement of drive shaft 13 of this embodiment operates as follows.
- the pressure of refrigerant gas within fluid pockets 70 causes the vibration within compressor.
- the vibrations caused out of compressor such as the mechanical vibration caused within the automobile engine room, and like, propagate the inside of compressor.
- the above vibrations propagate the members disposed within compressor, the members also vibrate.
- the vibration propagating drive shaft 13 add the axial power to drive shaft 13 so as to reciprocate.
- the forward movement of drive shaft 13 is prevented by being in contact projection 131 with the rearward end of inner race 141, and rearward movement of drive shaft 13 is prevented by being in contact projection 132 with the forward end of inner race 151.
- balance weight 17 and the forward end of hearing 14, or circular end plate 31 doesn't occur, abrasion and breakage of the members disposed within compressor is prevented.
- FIG.3 a hermetically sealed scroll type compressor not belonging to the present invention is shown.
- the same construction is accorded like numerals as shown with respect to FIG.2 and the explanation of part of the identical elements is substantially omitted.
- Ring 91 made of metal is set in the circumference of the forward end of drive shaft 13. Projection 131 is in contact with the rearward end of inner race 141 of bearing 14, and ring 91 is in contact with the forward end of inner race 141 of bearing 14.
- FIG.4 a hermetically sealed scroll type compressor not belonging to the present invention is shown.
- the same construction is accorded like numerals as shown with respect to FIG.2 and the explanation of part of the identical elements is substantially omitted.
- Radial projection 133 radially extends from the exterior surface of the forward end of drive shaft 13. Ring 92 made of metal is set in the circumference of the forward end of drive end of drive shaft 13. Projection 133 is in contact with the forward end of inner race 141 of bearing 14, and ring 92 is in contact with the rearward end of inner race 141 of bearing 14.
- FIG.5 a hermetically sealed scroll compressor in accordance with a second embodiment of the present invention is shown.
- the same construction is accorded like numerals as shown with respect to FIG.2 and the explanation of part of the identical elements is substantially omitted.
- Ring 93 made of metal is set in the circumference of the rearward end drive shaft 13. Projection 133 is in contact with the forward end of inner race 141 of bearing 14, and ring 93 is in contact with the rearward end of inner race 151 of bearing 15.
- FIG.6 a hermetically sealed scroll type compressor in accordance with a third embodiment of the present invention is shown.
- the same construction is accorded like numerals as shown with respect to FIG.2 and the explanation of part of the identical elements is substantially omitted.
- Ring 92 is in contact with the rearward end of inner race 141 of bearing 14, and the side surface of annular ridge 132 is in contact with the forward end of inner race 151 of bearing 15.
- FIG.7 a hermetically sealed scroll type compressor not belonging to the present invention is shown.
- the same construction is accorded like numerals as shown with respect to FIG.2 and the explanation of part of the identical elements is substantially omitted.
- annular ridge 132 is in contact with the forward end of inner race 151 of bearing 15, and ring 132 is in contact rearward end of inner race 151 of bearing 15.
Description
- This invention relates to a fluid compressor, and more particularly, to a motor driven fluid compressor having the compression and drive mechanisms within a hermetically sealed container.
- Motor driven fluid compressors having the compression and drive mechanisms within a hermetically sealed housing are known in the art. For example, Japanese Patent Application Publication No. 1-110891 discloses a compressor including a hermetically sealed housing which contains a compression mechanism, such as a scroll type fluid compression mechanism and a drive mechanism therein as shown In FIG. 1.
- With reference to FIG.1, the compressor includes a hermetically sealed
casing 1, driveshaft 2, fixed and orbiting scrolls 3 and 4. Thedrive shaft 2 axially penetrates the center of inner block 5 and is rotatably at the center of inner block 5 by hearing 6. The forward end ofdrive shaft 2 forms abalance weight 7. A hole 8 is axially formed on thebalance weight 7. An annular projection 9 is formed on the rearward end surface of acircular end plate 10 of orbiting scroll 4 and is inserted within hole 8. Thebearing 11 is disposed along the circumference of the inner surface of hole 8 and support annular projection 9 within hole 8. As the rearward end ofbalance weight 7 is spaced from beading 6. Thespace 12 is formed between the rearward end surface ofbalance weight 7 and the forward end surface of hearings 6. And as the rearward end surface of annular projection 9 is spaced from the bottom end surface of hole 8. Thespace 13 is formed between the rearward end surface of annular projection 9 and the bottom and surface of hole 8. - According to the above construction of the compressor, during operation of the compressor, pressure of the refrigerant gas in the
fluid pockets 14 which are defined by fixed and orbiting scrolls 3 and 4 periodically fluctuates so that orbiting scroll 4 periodically moves forwardly and rearwardly. Furthermore, the periodic vibration propagating from the automobile engine compartment also causes a periodic axial movement of orbiting scroll 4. - Therefore, the annular projection 9 periodically moves forwardly and rearwardly within
space 13, and thebalance weight 7 periodically moves forwardly and rearwardly withinspaces balance weight 7 causesbalance weight 7 to repeat the collision with bearings 6. Therefore, the friction betweenbalance weight 7 and bearings 6 occurs, and balanceweight 7 and bearings 6 abrades or breaks. As well as, the friction between the rearward end surface of annular projection 9 and the bottom surface of hole 8 occurs, as a result, balanceweight 7 and annular projection 9 abrades or breaks. - A motor driven fluid compressor comprising the features defined in the preamble of
claim 1 is disclosed in document EP-A-0 283 045. This compressor comprises an axial movement preventing means for preventing the axial movement of the drive shaft, this movement preventing means being formed by a flange and a nut at the drive shaft, the flange and nut both engaging the inner race of a bearing for the drive shaft. Therefore, both the forward and rearward movements of the drive shaft are prevented by the inner race of said bearing and the bearing therefore receives the axial force which tends to move the drive shaft in either direction. Thus, the bearing receives axial shearing stress with an excessive frequency so that the life of this bearing and therefore the life of the compressor as a whole is shortened. - This drawback of the prior art is overcome by an axial movement preventing means as defined in the characterizing portion of
claim 1. - In an embodiment not belonging to the invention, the drive shaft radially forms the projection being in contact with the rearward end of bearing which supports the forward end of the drive shaft in the inner block.And the ring made of metal is set in the circumference of drive shaft so as to be in contact ring with the forward end of bearing which supports the forward end of drive shaft in inner block.In this construction, the projection prevents drive shaft moving forward, the ring prevents drive shaft moving rearward.
- In a further embodiment not belonging to the invention, the drive shaft radially forms projection being in contact with the forward end of bearing which supports the forward end of drive shaft in inner block. And the ring made of metal is set in drive shaft so as to be in contact ring with the rearward end of bearing which supports the forward end of drive shaft in inner block. In this construction, the projection prevents drive shaft moving rearward, the ring prevents drive shaft moving forward.
- In a second embodiment of the invention, the drive shaft radially forms projection being in contact with the forward end of bearing which supports the forward end of drive shaft in inner block. And the ring made of metal is set in drive shaft so as to be in contact ring with the rearward and of bearing which supports the rearward end of drive shaft in inner block. In this construction, the projection prevents drive shaft moving rearward, the ring prevents drive shaft moving forward.
- In a third embodiment of the invention, the drive shaft radially forms projection being in contact with forward end of the bearing which supports the rearward end of drive shaft in inner block. And the ring made of metal is set in drive shaft so as to be in contact ring with the bearing which supports the forward end of drive shaft in inner block. In this construction, the projection prevents drive shaft moving rearward, the ring prevents drive shaft moving forward.
- In a further embodiment not belonging to this invention, the drive shaft radially forms projection being in contact with the forward end of bearing which supports the rearward end of drive shaft And the ring mode of metal is set in drive shaft so as to be in contact ring with the rearward end of bearing which supports the rearward end of drive shaft in inner block. In this construction, the projection prevents drive shaft moving rearward, the ring prevents drive shaft moving forward.
- FIG.1 is a vertical longitudinal sectional view of a scroll type compressor in accordance with one prior art.
- FIG.2 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor in accordance with a first embodiment of this invention.
- FIG.3 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor not belonging to this invention.
- FIG .4 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor in accordance with a further embodiment not belonging to this invention.
- FIG.5 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor in accordance with a second embodiment of this invention.
- FIG.6 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor in accordance with a third embodiment of this invention.
- FIG.7 is a vertical longitudinal sectional view of a hermetically sealed scroll type compressor not belonging to this invention.
- Referring, to FIG.2, a hermetically sealed scroll type compressor in accordance with a first embodiment of the present invention is shown. For purpose of explanation only, the left side of the figure will be referenced as the forward end or front of the compressor and the right side of the figure will be referenced as the rearward end or rear of the compressor.
- The compressor includes hermetically sealed
casing 10, fixed and orbitingscrolls motor 40. Fixedscroll 20 includescircular end plate 21 and spiral element orwrap 22 extending from rearward end surface thereof. Fixedscroll 20 is fixedly disposed within a front end portion ofcasing 10 by a plurality ofscrews 23.Circular end plate 21 offixed scroll 20 partitions an inner chamber ofcasing 10 intodischarge chamber 50 andsuction chamber 60. -
Orbiting scroll 30 is disposed withinsuction chamber 60, and includescircular end plate 31 and spiral element orwrap 32 extending from forward end surface ofcircular end plate 31.Spiral element 22 offixed scroll 20 andspiral element 32 of orbiting scroll 30 interfit at an angular and radial offset to form a plurality of linear contacts which define at least one pair of sealed off fluid pockets 70.Annular projection 33 is formed at the rearward end surface of circular,end plate 31 oppositespiral element 32.Rotation prevention device 34 is disposed on circumferential surface ofannular projection 33 to prevent rotation of orbitingscroll 30 during orbital motion of orbitingscroll 30. - First and second
inner blocks secure stator 41 ofmotor 40 and are fixedly disposed near opposite ends withinsuction chamber 60.Drive shaft 13 axially penetrates the centers ofinner blocks drive shaft 13 are rotatably supported byinner blocks bearings Motor 40 includesstator 41 androtor 42 which is fixedly secured to an exterior surface ofdrive shaft 13.Pin member 16 is integral with and axially projects from the forward end surface ofdrive shaft 13 and is radially offset from the axis ofdrive shaft 13.Balance weight 17 is disposed within a hollow space 61 defined byinner block 11 and thecircular end plate 31 of orbitingscroll 30, and is fixedly connected topin member 16.Radial projection 131 is formed at the exterior surface ofdrive shaft 13 at a position which is rear to bearing 14 so as to continuously contact a rear end surface ofinner race 141 ofbearing 14 with a front side surface ofradial projection 131.Annular ridge 132 is formed at the exterior surface ofdrive shaft 13 at a position which is front of bearing 15 so as to continuously contact the side surface ofannular ridge 132 with the front end surface ofinner race 151 ofbearing 15. - Drive
shaft 13 is provided withaxial bore 81 and a plurality of radial bores 82. Axial bore 81 extends from an opening at rearward end ofdrive shaft 13, that is, the end oppositepin member 16, to a closed end rearward ofpin member 16.Narrow passage 83 links the forward closed end ofaxial bore 81 to an open end surface ofpin member 16adjacent orbiting scroll 30. The plurality of radial bores 82 link axial bore 81 near its closed end tocavity 62 located betweenmotor 40 andhearing 14. Suctiongas inlet pipe 84 is inserted through the rearward end ofcasing 10 and faces the opening ofaxial bore 81. Discharge gas outlet pipe attached to a side wall ofcasing 10 and links dischargechamber 50 to an external element. - In operation,
stator 41 generates a magnetic field causing rotation ofrotor 42, thereby rotatingdrive shaft 13. This rotation is connected to orbital motion of orbitingscroll 30 throughbalance weight 17. Rotational motion of orbitingscroll 30 is prevented byrotation prevention drive 34. Refrigerant gas introduced intosuction chamber 60 through suctiongas inlet pipe 84 is taken into the outer sealed fluid pockets 70 between fixedscroll 20 and orbitingscroll 30, and moves inwardly towards the center ofspiral elements scroll 30. As the refrigerant moves towards the central pockets, it undergoes a resultant volume reduction and compressor, and is discharged to dischargechamber 50 throughvalved discharge port 24. Discharge gas indischarge chamber 50 then flows to an external fluid circuit (not shown) through dischargegas outlet pipe 85. - The preventing mechanism for preventing the axial movement of
drive shaft 13 of this embodiment operates as follows. When the compressor drives, for example, the pressure of refrigerant gas within fluid pockets 70 causes the vibration within compressor. And the vibrations caused out of compressor, such as the mechanical vibration caused within the automobile engine room, and like, propagate the inside of compressor. - The above vibrations propagate the members disposed within compressor, the members also vibrate. The vibration propagating
drive shaft 13 add the axial power to driveshaft 13 so as to reciprocate. However, the forward movement ofdrive shaft 13 is prevented by being incontact projection 131 with the rearward end ofinner race 141, and rearward movement ofdrive shaft 13 is prevented by being incontact projection 132 with the forward end ofinner race 151. As a result, as the reciprocation ofdrive shaft 13 is prevented and the collision betweendrive shaft 13 and the other members disposed within compressor, particularly, balanceweight 17 and the forward end of hearing 14, orcircular end plate 31 doesn't occur, abrasion and breakage of the members disposed within compressor is prevented. - Referring to FIG.3, a hermetically sealed scroll type compressor not belonging to the present invention is shown. The same construction is accorded like numerals as shown with respect to FIG.2 and the explanation of part of the identical elements is substantially omitted.
-
Ring 91 made of metal is set in the circumference of the forward end ofdrive shaft 13.Projection 131 is in contact with the rearward end ofinner race 141 of bearing 14, andring 91 is in contact with the forward end ofinner race 141 of bearing 14. - In this construction, when the vibration propagating
drive shaft 13 add the axial power to driveshaft 13 so as to reciprocate, the forward movement ofdrive shaft 13 is prevented by being incontact projection 131 with the rearward end ofinner race 141, and the rearward movement ofdrive shaft 13 is prevented by being incontact ring 91 with the forward end ofinner race 141. As a result, the axial movement ofdrive shaft 13 is prevented. - Referring to FIG.4, a hermetically sealed scroll type compressor not belonging to the present invention is shown. The same construction is accorded like numerals as shown with respect to FIG.2 and the explanation of part of the identical elements is substantially omitted.
-
Radial projection 133 radially extends from the exterior surface of the forward end ofdrive shaft 13.Ring 92 made of metal is set in the circumference of the forward end of drive end ofdrive shaft 13.Projection 133 is in contact with the forward end ofinner race 141 of bearing 14, andring 92 is in contact with the rearward end ofinner race 141 of bearing 14. - In this construction, when the vibration propagating
drive shaft 13 add the axial power to driveshaft 13 so as to reciprocate, the forward movement ofdrive shaft 13 is prevented by being incontact ring 92 with the rearward end ofinner race 141 and the rearward movement ofdrive shaft 13 is prevented by being incontact projection 133 with the forward end ofinner race 141. As a result, the reciprocation ofdrive shaft 13 is also prevented. - Referring to FIG.5, a hermetically sealed scroll compressor in accordance with a second embodiment of the present invention is shown. The same construction is accorded like numerals as shown with respect to FIG.2 and the explanation of part of the identical elements is substantially omitted.
-
Ring 93 made of metal is set in the circumference of the rearwardend drive shaft 13.Projection 133 is in contact with the forward end ofinner race 141 of bearing 14, andring 93 is in contact with the rearward end ofinner race 151 of bearing 15. - In this construction, when the vibration propagating
drive shaft 13 add the axial power to driveshaft 13 so as to reciprocate, the forward movement ofdrive shaft 13 is prevented by being incontact ring 93 with the rearward end ofinner race 151 and the rearward movement ofdrive shaft 13 is prevented by being incontact projection 133 with the forward end ofinner race 141. As a result, the reciprocation ofdrive shaft 13 is also prevented. - Referring to FIG.6, a hermetically sealed scroll type compressor in accordance with a third embodiment of the present invention is shown. The same construction is accorded like numerals as shown with respect to FIG.2 and the explanation of part of the identical elements is substantially omitted.
-
Ring 92 is in contact with the rearward end ofinner race 141 of bearing 14, and the side surface ofannular ridge 132 is in contact with the forward end ofinner race 151 of bearing 15. - In this construction, when the vibration propagating
drive shaft 13 add the axial power to driveshaft 13 so as to reciprocate, the forward movement ofdrive shaft 13 is prevented by being incontact ring 92 with the rearward end ofinner race 141, and the rearward movement ofdrive shaft 13 is prevented by being contact the side surface ofannular ridge 132 with the forward end ofinner race 151. As a result, the reciprocation ofdrive shaft 13 is also prevented. - Referring to FIG.7, a hermetically sealed scroll type compressor not belonging to the present invention is shown. The same construction is accorded like numerals as shown with respect to FIG.2 and the explanation of part of the identical elements is substantially omitted.
- The side surface of
annular ridge 132 is in contact with the forward end ofinner race 151 of bearing 15, andring 132 is in contact rearward end ofinner race 151 of bearing 15. - In this construction, when the vibration propagating
drive shaft 13 adds the axial power to driveshaft 13 so as to reciprocate, the forward movement ofdrive shaft 13 is prevented by being incontact ring 93 with the rearward end ofinner race 151, and the rearward movement ofdrive shaft 13 is prevented by being in contact the side surface ofannular ridge 132 with the forward end ofinner race 151.
As a result, the reciprocation ofdrive shaft 13 is prevented. - The above explanation of a hermetically sealed scroll type compressor in accordance with the second and third embodiments of the present invention is omitted about the same as explanation of operation of the first embodiment.
Claims (4)
- A motor driven fluid compressor comprising:
a compressing mechanism (20, 30) for compressing a gaseous fluid;
a driving mechanism (40, 13) for driving said compressing mechanism, said driving mechanism including a drive shaft (13) operatively connected to said compressing mechanism;
a housing (10) having a first axial end and a second axial end opposite to said first axial end, and containing said compressing mechanism (20, 30) and said driving mechanism (40, 13) therewithin;
a first inner block (11) located adjacent said first axial end of said housing and rotatably supporting one end of said drive shaft (13) by a first bearing means (14), and second inner block (12) located adjacent said second axial end of said housing and rotatably supporting the other end of said drive shaft (13) by a second bearing means (15);
axial movement preventing means (131, 132; 133, 93; 92, 132) for preventing the axial movement of said drive shaft (13);
characterized in that said axial movement preventing means includes a first axial movement preventing device (131; 133; 92) associated with said first bearing means (14) and a second axial movement preventing device (132; 93) associated with said second bearing means (15). - The motor driven fluid compressor of claim 1, said first axial movement preventing device being formed by an engagement between an annular projection (131) formed at an outer peripheral surface of one end of said drive shaft (13) to be located at the side of said second axial end of said housing (10) relative to said first bearing means (14) and an inner race (141) of said first bearing means (14);
said second axial movement preventing device being formed by an engagement between an annular ridge (132) formed at an outer peripheral surface of the other end of said drive shaft (13) to be located at the side of said first axial end of said housing (10) relative to said second hearing means (15) and an inner race (151) of said second bearing means (15). - The motor driven fluid compressor of claim 1, said first axial movement preventing device being formed by an engagement between an annular projection (133) formed at an outer peripheral surface of one end of said drive shaft (13) to be located at the side of said first axial end of said housing (10) relative to said first bearing means (14), and an inner race (141) of said first bearing means (14);
said second axial movement preventing device being formed by an engagement between an annular ring member (93) fixedly disposed at an outer peripheral surface of the other end of said drive shaft (13) to be located at the side of said second axial end of said housing (10) relative to said second bearing means (15), and an inner race (151) of said second bearing means (15). - The motor driven fluid compressor of claim 1, said first axial movement preventing device being formed by an engagement between an annular ring member (92) fixedly disposed at an outer peripheral surface of one end of said drive shaft (13) to be located at the side of said second axial end of said housing (10) relative to said first bearing means (14), and an inner race (141) of said first bearing means (14),
said second axial movement preventing device being formed by an engagement between an annular ridge (132) formed at an outer peripheral surface of the other end of said drive shaft (13) to be located at the side of said first axial end of said housing (10) relative to said second bearing means (15), and an inner race (151) of said second bearing means (15).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP278060/91 | 1991-10-24 | ||
JP3278060A JPH05113187A (en) | 1991-10-24 | 1991-10-24 | Compressor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0538892A1 EP0538892A1 (en) | 1993-04-28 |
EP0538892B1 true EP0538892B1 (en) | 1995-12-20 |
Family
ID=17592099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92118209A Expired - Lifetime EP0538892B1 (en) | 1991-10-24 | 1992-10-23 | Motor driven fluid compressor |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0538892B1 (en) |
JP (1) | JPH05113187A (en) |
KR (1) | KR100193913B1 (en) |
AU (1) | AU649361B2 (en) |
CA (1) | CA2081434A1 (en) |
DE (1) | DE69206952T2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07174082A (en) * | 1993-12-20 | 1995-07-11 | Sanden Corp | Scroll type fluid machine |
US6129455A (en) * | 1998-11-10 | 2000-10-10 | Ford Motor Company | Bearing assembly |
KR100447206B1 (en) * | 2002-08-27 | 2004-09-04 | 엘지전자 주식회사 | Scroll compressor with outer rotor type motor |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU607745B2 (en) * | 1987-03-20 | 1991-03-14 | Sanden Corporation | Scroll type compressor |
US4960238A (en) * | 1989-04-18 | 1990-10-02 | Macmillan Bloedel Containers | 2-piece pizza box with cut-out corners |
JPH05113188A (en) * | 1991-10-24 | 1993-05-07 | Sanden Corp | Sealed type motor-driven compressor |
JP3078369B2 (en) * | 1991-10-24 | 2000-08-21 | サンデン株式会社 | Compressor |
-
1991
- 1991-10-24 JP JP3278060A patent/JPH05113187A/en active Pending
-
1992
- 1992-10-23 DE DE69206952T patent/DE69206952T2/en not_active Expired - Lifetime
- 1992-10-23 EP EP92118209A patent/EP0538892B1/en not_active Expired - Lifetime
- 1992-10-24 KR KR1019920019700A patent/KR100193913B1/en not_active IP Right Cessation
- 1992-10-26 CA CA002081434A patent/CA2081434A1/en not_active Abandoned
- 1992-10-26 AU AU27351/92A patent/AU649361B2/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
DE69206952T2 (en) | 1996-07-11 |
DE69206952D1 (en) | 1996-02-01 |
AU649361B2 (en) | 1994-05-19 |
AU2735192A (en) | 1993-04-29 |
KR930008304A (en) | 1993-05-21 |
JPH05113187A (en) | 1993-05-07 |
EP0538892A1 (en) | 1993-04-28 |
CA2081434A1 (en) | 1993-04-25 |
KR100193913B1 (en) | 1999-06-15 |
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