EP0240739B1 - Scroll type compressor with lubricating system - Google Patents
Scroll type compressor with lubricating system Download PDFInfo
- Publication number
- EP0240739B1 EP0240739B1 EP87103234A EP87103234A EP0240739B1 EP 0240739 B1 EP0240739 B1 EP 0240739B1 EP 87103234 A EP87103234 A EP 87103234A EP 87103234 A EP87103234 A EP 87103234A EP 0240739 B1 EP0240739 B1 EP 0240739B1
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- EP
- European Patent Office
- Prior art keywords
- scroll
- end plate
- orbiting scroll
- step portion
- lubricant
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
Definitions
- This invention relatos to fluid displacement apparatus, and more particularly, to a scroll type fluid compressor.
- Scroll type fluid displacement apparatus are well known in the prior art.
- U.S. Patent No. 801,182 discloses a scroll type fluid displacement apparatus including two scroll members each having a circular end plate and a spiroidal or involute spiral element. These scroll members are maintained angularly and radially offset so that the spiral elements interfit to make a plurality of line contacts between their spiral curved surfaces, thereby to seal off and define at least one pair of fluid pockets.
- the relative orbital motion of the two scroll members shifts the line contacts along the spiral curved surfaces and, therefore, the fluid pockets change in volume.
- the volume of the fluid pockets increases or decreases dependent on the direction of the orbital motion. Therefore, scroll type fluid displacement apparatus are applicable to compress, expand or pump fluids.
- EP-A-0.077.214 was filed prior to the date of filing of the present application but published after that date.
- EP-A-0.077.214 discloses a scroll type compressor including a housing which comprises a front end plate and a cup shaped casing. Fluid inlet and outlet ports are formed in the housing.
- a fixed scroll having a fixed scroll end plate from which a first wrap extends is fixedly disposed within the housing.
- An orbiting has an orbiting scroll end plate from which a second wrap extends. The first and second wraps interfit at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets.
- a driving mechanism is operatively connected with the orbiting scroll to effect orbiting motion of the orbiting scroll whilst preventing orbital motion of that scroll, thus changing the volume of the fluid pockets.
- Scroll type fluid displacement apparatus are particularly well-suited for use as a refrigerant compressor in an automobile air conditioner.
- the refrigerant compressor for an automobile air conditioner be compact in size and light in weight, since the compressor is placed in the engine compartment of an automobile.
- the refrigerant compressor is generally coupled to an electromagnetic clutch for transmitting the output of an engine to the drive shaft of the compressor. The weight of the electromagnetic clutch therefore increases the total weight of a compressor unit.
- a scroll type compressor including a housing comprising a front end plate and a cup shaped casing, a fixed scroll fixedly disposed within said housing and having a fixed scroll end plate from which a first wrap extends, an orbiting scroll having an orbiting scroll end plate from which a second wrap extends, said first and second wraps interfitting at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets, a driving mechanism operatively connected with said orbiting scroll to effect the orbital motion of said orbiting scroll while preventing the rotation of said orbiting scroll, and thus changing the volume of said fluid pockets due to the orbital motion of said orbiting scroll,
- a fluid inlet port formed in said cup shaped casing radially outwardly of said orbiting scroll for introducing an oil misted gas into the interior of the housing, said fluid inlet port having a step portion projecting radially inwardly from an inner wall of said fluid inlet port;
- a second lubricant passageway formed through said front end plate, said second lubricant passageway connecting said first lubricant passageway and a shaft seal cavity formed in said front end plate so that lubricant separates from incoming gas to be compressed on said step portion and passes thereform to said seal cavity through said first and second lubricant passageways.
- the step portion may have a flange portion formed on it generally perpendicular to the radially inner end of said step portion.
- Figure 1 is a vertical sectional view of a main part of a compressor according to one embodiment of this invention.
- Figure 2 is a vertical sectional view illustrating a prior art compressor.
- a refrigerant compressor unit includes a compressor housing 10 comprising a front end plate 11 and a cup shaped casing 12 which is attached to one side surface of front end plate 11.
- An opening 111 is formed in the center of front end plate 11 for penetrating or passage of a drive shaft 13.
- An annular projection 112 concentric with opening 111 is formed on the inside face of front end plate 11 and projects towards cup shaped casing 12.
- An outer peripheral surface of an annular projection 112 contacts an inner wall surface of cup shaped casing 12.
- Cup shaped casing 12 is fixed to front end plate 11 by a fastening means, for example, bolts-nuts (not shown). The open portion of cup shaped casing 12 is thereby covered and closed by front end plate 11.
- An O-ring member 14 is placed between front end plate 11 and the open portion of cup shaped casing 12, to thereby secure a seal between the fitting or mating surfaces of front end plate 11 and cup shaped casing 12.
- Front end plate 11 has an annular sleeve portion 17 projecting outwardly from the front or outside surface thereof.
- Sleeve 17 surrounds drive shaft 13 and defines a shaft seal cavity.
- sleeve portion 17 is formed separately from front end plate 11. Therefore, sleeve portion 17 is fixed to front end surface of front end plate 11 by a suitable fastening means, for example, screws (not shown). Alternatively, the sleeve portion 17 may be formed integral with front end plate 11.
- Drive shaft 13 is rotatably supported by sleeve portion 17 through a bearing 19 disposed within the front end portion of sleeve portion 17.
- Drive shaft 13 is formed with a disk rotor 131 at its inner end portion, which is rotatably supported by front end plate 11 through a bearing 16 disposed within opening 111 of front end plate 11.
- a shaft seal assembly 20 is assembled on drive shaft 13 within the shaft seal cavity of front end plate 11.
- Drive shaft 13 is coupled to an electromagnetic clutch (not shown) which may be disposed on the outer peripheral portion of sleeve portion 17.
- drive shaft 13 is driven by an external drive power source, for example, a motor of a vehicle, through a rotation force transmitting means such as sn electromagnetic clutch.
- a fixed scroll 25, an orbiting scroll 26, a driving mechanism for orbiting scroll 26 and a rotation preventing/thrust bearing means 37 for orbiting scroll 26 are disposed in the inner chamber of cup shaped casing 12.
- the inner chamber is formed between the inner wall of cup shaped casing 12 and front end plate 11.
- Fixed scroll 25 includes a circular end plate 251 and a wrap or spiral element 252 affixed to or extending from one major side surface of circular plate 251.
- a bottom plate 122 of cup shaped casing 12 is formed with a plurality of legs 253 axially projecting from its inner end surface, as shown in Figure 2.
- each leg 253 is fitted against the other major side surface of circular end plate 251.
- Fixed scroll 25 is fixed by a plurality of by screws 27 each of which screw into circular end plate 251 from the outside of bottom plate portion 122 through leg 253.
- a first sealing member 28 is disposed between the end surface of each leg 253 and the inner surface of bottom plate portion 122, to thereby prevent fluid leakage along screws 27.
- a groove 256 is formed on the outer peripheral surface of circular plate 251 and a second seal ring member 29 is disposed therein to form a seal between the inner surface of cup shaped portion 12 and the outer peripheral surface of circular plate 251.
- the inner chamber of cup shaped portion 12 is partitioned into two chambers by circular plate 251; a rear or discharge chamber 30, in which legs 253 are disposed, and a front or suction chamber 31, in which spiral element 251 of fixed scroll 25 is disposed.
- Cup chaped casing 12 is provided with a fluid inlet port 35 and a fluid outlet port 36, which respectively are connected to the front and rear chambers 31, 30.
- a hole or discharge port 254 is formed through the circular plate 251.at a position near to the center of spiral element 252. Discharge port 254 connects the fluid pocket formed in the center of the interfitting spiral element and rear chamber 30.
- Orbiting scroll 26 is disposed in front chamberer 31.
- orbiting scroll member 26 also comprises a circular end plate 261 and a wrap or spiral element 262 affixed to or extending from one side surface of circular end plate 261.
- Spiral element 262 and spiral element 252 inter-fit at angular offset of 180° and a predetermined radial offset.
- a pair of fluid pockets are thereby defined between spiral elements 252, 262.
- Orbiting scroll 26 is connected to the drive mechanism and to the rotation preventing/thrust bearing mechanism. These last two mechanisms effect orbital motion of the orbiting scroll member 26 by rotation of drive shaft 13, to thereby compress fluid passing through the compressor unit.
- Drive shaft 13 which is rotatably supported by sleeve portion 17 through ball bearing 19, is formed with disk-rotor 131.
- Disk rotor 131 is rotatably supported by front end plate 11 through ball bearing 16 disposed within opening 111 of front end plate 11.
- a crank pin or drive pin 15 projects axially inwardly from an end surface of disk rotor 131 and is radially offset from the center of drive shaft 13.
- Circular plate 261 of orbiting scroll 26 is provided with a tubular boss 263 projecting axially, outwardly from the end surface opposite to the side from which spiral element 262 extends.
- a discoid or short axial bushing 33 is fitted into boss 263, and is rotatably supported therein by a bearing, such as a needly bearing 34.
- Bushing 33 has a balance weight 331 which is shaped as a portion of a disk or ring and extends radially from bushing 33 along a front surface thereof.
- An eccentric hole is formed in bushing 33 radially offset from the center of bushing 33.
- Drive pin 15 is fitted into the eccentrically disposed hole 332, within which a bearing may be inserted.
- Bushing 33 is therefore driven by the revolution of drive pin 15 and permitted to rotate by needle bearing 34.
- the spiral element of orbiting scroll 26 is thus pushed against the spiral element of fixed scroll 25 due to the moment created between the driving point and the reaction force acting point of the pressurized gas.
- Rotation preventing/thrust bearing device 37 is placed between the inner end surface of front end plate 11 and the end surface of circular end plate 261 of orbiting scroll 26 which faces the inner end surface of front end plate 11.
- Rotation preventing/thrust bearing device 37 includes a fixed ring 371 which is fastened against the inner end surface of front end plate 11, an orbiting ring 372 which is fastened against the end surface of circular end plate 261, and bearing elements, such as a plurality of spherical balls 373.
- both ring 371 and 372 are formed by separate plate elements 371a and 372a, and ring elements 371b and 372b which have the plurality of pairs of holes 374 and 375.
- the elements of each ring are respectively fixed by suitable fastening means.
- the plate and ring elements may be formed integral with one another.
- orbiting scroll 26 In operation, the rotation of orbiting scroll 26 is prevented by balls 373, which interact with the edges of holes 374 and 375 to prevent rotation. Also, these balls 373 carry the axial thrust load from orbiting scroll 26. Thus, orbiting scroll 26 orbits while maintaining its angular orientation with respect to fixed scroll 25.
- the cup-shaped casing 12 is formed with a fluid inlet port 35 and this fluid inlet port 35 is located in the casing 12 at a location radially outwardly of and at the same axial location as a portion of the rotation preventing/thrust bearing device 37. Therefore, the refrigerant gas which is introduced into the suction chamber 31 through the fluid inlet port 35 strikes against a part of the rotation preventing/thrust bearing device 37.
- the lubricating oil which exists within the refrigerant gas as an oil mist, is separated from the suction gas. After separating, the oil adheres to the balls and to the surfaces of the orbiting and fixed rings which are contacted by the rolling surfaces of the balls, and lubricates the rolling surfaces.
- the suction gas also cools and lubricates parts of the bearing portion disposed within cup-shaped casing 12.
- FIG. 1 The compressor shown in Figure 1 is similar to the known compressor of Figure 2 except for its lubricating system. Therefore, only a part of the compressor, including the lubricating system, is shown. The remaining portion of the compressor is omitted for the purpose of simplification of the drawings. Similar parts are represented by the same reference numerals as in Figure 2 except for parts of the lubricating system.
- a fluid inlet port 2 of the lubricating system is formed in cup shaped housing 12 and extends radially and outwardly of orbiting scroll 26 in suction chamber 31.
- an oil misted refrigerant gas is introduced through fluid inlet port 2 into suction chamber 31.
- sleeve portion 17 The interior of sleeve portion 17 is connected to an opening 111 in front end plate 11 to form a shaft seal cavity 6.
- a shaft seal assembly 20 is mounted on drive shaft 13.
- a lubricating system for the compressor will now be described.
- a step portion 2a is formed in the fluid inlet port 2.
- Step portion 2a projects radially inwardly from an inner wall of fluid inlet port 2.
- a flange 2b is formed along the inner end portion of step portion 2a and is generally perpendicular to step portion 2a to accumulate and separate oil at step portion 2a.
- Flange 2b projects radially outward from step portion 2a as viewed with respect to the rotational axis of shaft 13.
- Cup shaped casing 12 is formed with a first oil passageway 4 one end of which opens at the inner wall of fluid inlet port 2.
- First oil passageway 4 is connected with a second oil passageway 5 which opens at the inner wall of shaft seal cavity 6.
- the shaft seal cavity in which shaft seal assembly 20 is disposed is thus connected with fluid inlet port 2 through oil passageways 4 and 5.
- the refrigerant gas is introduced into suction chamber 31 through inlet port 2.
- the oil mist suction gas strikes against step portion 2aq.
- the oil included with the suction gas is separated therefore and accumulates on step portion 2a.
- the accumulated oil flows into first oil passageway 4, and then flows out to the shaft seal cavity 6 of front end plate 11 through second oil passageway 5.
- the oil which flows into the shaft seal cavity lubricates and cools the shaft seal assembly 20 and returns to the suction chamber 31 through bearing 16 while lubricating bearing 16.
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- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Description
- This application is a divisional application from our copending European patent application No. 83305951.2 filed on September 30, 1983.
- This invention relatos to fluid displacement apparatus, and more particularly, to a scroll type fluid compressor.
- Scroll type fluid displacement apparatus are well known in the prior art. For example, U.S. Patent No. 801,182 (Creux) discloses a scroll type fluid displacement apparatus including two scroll members each having a circular end plate and a spiroidal or involute spiral element. These scroll members are maintained angularly and radially offset so that the spiral elements interfit to make a plurality of line contacts between their spiral curved surfaces, thereby to seal off and define at least one pair of fluid pockets. The relative orbital motion of the two scroll members shifts the line contacts along the spiral curved surfaces and, therefore, the fluid pockets change in volume. The volume of the fluid pockets increases or decreases dependent on the direction of the orbital motion. Therefore, scroll type fluid displacement apparatus are applicable to compress, expand or pump fluids.
- EP-A-0.077.214 was filed prior to the date of filing of the present application but published after that date. EP-A-0.077.214 discloses a scroll type compressor including a housing which comprises a front end plate and a cup shaped casing. Fluid inlet and outlet ports are formed in the housing. A fixed scroll having a fixed scroll end plate from which a first wrap extends is fixedly disposed within the housing. An orbiting has an orbiting scroll end plate from which a second wrap extends. The first and second wraps interfit at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets. A driving mechanism is operatively connected with the orbiting scroll to effect orbiting motion of the orbiting scroll whilst preventing orbital motion of that scroll, thus changing the volume of the fluid pockets.
- Scroll type fluid displacement apparatus are particularly well-suited for use as a refrigerant compressor in an automobile air conditioner. Generally, it is desirable that the refrigerant compressor for an automobile air conditioner be compact in size and light in weight, since the compressor is placed in the engine compartment of an automobile. However, the refrigerant compressor is generally coupled to an electromagnetic clutch for transmitting the output of an engine to the drive shaft of the compressor. The weight of the electromagnetic clutch therefore increases the total weight of a compressor unit.
- It is an object of this invention to provide a scroll type compressor wherein moving parts, in particular a shaft seal portion, are efficiently lubricated and cooled.
- According to the present invention there is provided a scroll type compressor including a housing comprising a front end plate and a cup shaped casing, a fixed scroll fixedly disposed within said housing and having a fixed scroll end plate from which a first wrap extends, an orbiting scroll having an orbiting scroll end plate from which a second wrap extends, said first and second wraps interfitting at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets, a driving mechanism operatively connected with said orbiting scroll to effect the orbital motion of said orbiting scroll while preventing the rotation of said orbiting scroll, and thus changing the volume of said fluid pockets due to the orbital motion of said orbiting scroll,
- a fluid inlet port formed in said cup shaped casing radially outwardly of said orbiting scroll for introducing an oil misted gas into the interior of the housing, said fluid inlet port having a step portion projecting radially inwardly from an inner wall of said fluid inlet port;
- a first lubricant passageway having one end opening to the inner wall of said fluid inlet port adjacent to said step portion; and
- a second lubricant passageway formed through said front end plate, said second lubricant passageway connecting said first lubricant passageway and a shaft seal cavity formed in said front end plate so that lubricant separates from incoming gas to be compressed on said step portion and passes thereform to said seal cavity through said first and second lubricant passageways.
- The step portion may have a flange portion formed on it generally perpendicular to the radially inner end of said step portion.
- The invention will now be described, by way of example, with reference to the accompanying drawings, in which:-
- Figure 1 is a vertical sectional view of a main part of a compressor according to one embodiment of this invention.
- Figure 2 is a vertical sectional view illustrating a prior art compressor.
- Prior to the description of the embodiment of this invention, a known compressor of a scroll type will be described with reference to Figure 2.
- Referring to Figure 2, a refrigerant compressor unit includes a
compressor housing 10 comprising afront end plate 11 and a cup shapedcasing 12 which is attached to one side surface offront end plate 11. An opening 111 is formed in the center offront end plate 11 for penetrating or passage of adrive shaft 13. Anannular projection 112 concentric with opening 111 is formed on the inside face offront end plate 11 and projects towards cup shapedcasing 12. An outer peripheral surface of anannular projection 112 contacts an inner wall surface of cup shapedcasing 12. Cup shapedcasing 12 is fixed tofront end plate 11 by a fastening means, for example, bolts-nuts (not shown). The open portion of cup shapedcasing 12 is thereby covered and closed byfront end plate 11. - An O-
ring member 14 is placed betweenfront end plate 11 and the open portion of cup shapedcasing 12, to thereby secure a seal between the fitting or mating surfaces offront end plate 11 and cup shapedcasing 12. -
Front end plate 11 has an annular sleeve portion 17 projecting outwardly from the front or outside surface thereof. Sleeve 17surrounds drive shaft 13 and defines a shaft seal cavity. In the embodiment shown in Figure 2, sleeve portion 17 is formed separately fromfront end plate 11. Therefore, sleeve portion 17 is fixed to front end surface offront end plate 11 by a suitable fastening means, for example, screws (not shown). Alternatively, the sleeve portion 17 may be formed integral withfront end plate 11. -
Drive shaft 13 is rotatably supported by sleeve portion 17 through abearing 19 disposed within the front end portion of sleeve portion 17.Drive shaft 13 is formed with adisk rotor 131 at its inner end portion, which is rotatably supported byfront end plate 11 through abearing 16 disposed within opening 111 offront end plate 11. Ashaft seal assembly 20 is assembled ondrive shaft 13 within the shaft seal cavity offront end plate 11. -
Drive shaft 13 is coupled to an electromagnetic clutch (not shown) which may be disposed on the outer peripheral portion of sleeve portion 17. Thus,drive shaft 13 is driven by an external drive power source, for example, a motor of a vehicle, through a rotation force transmitting means such as sn electromagnetic clutch. - A
fixed scroll 25, anorbiting scroll 26, a driving mechanism for orbitingscroll 26 and a rotation preventing/thrust bearing means 37 for orbitingscroll 26 are disposed in the inner chamber of cup shapedcasing 12. The inner chamber is formed between the inner wall of cup shapedcasing 12 andfront end plate 11. - Fixed
scroll 25 includes acircular end plate 251 and a wrap orspiral element 252 affixed to or extending from one major side surface ofcircular plate 251. Abottom plate 122 of cup shapedcasing 12 is formed with a plurality oflegs 253 axially projecting from its inner end surface, as shown in Figure 2. - An axial end surface of each
leg 253 is fitted against the other major side surface ofcircular end plate 251. Fixedscroll 25 is fixed by a plurality of byscrews 27 each of which screw intocircular end plate 251 from the outside ofbottom plate portion 122 throughleg 253. Afirst sealing member 28 is disposed between the end surface of eachleg 253 and the inner surface ofbottom plate portion 122, to thereby prevent fluid leakage alongscrews 27. Agroove 256 is formed on the outer peripheral surface ofcircular plate 251 and a secondseal ring member 29 is disposed therein to form a seal between the inner surface of cupshaped portion 12 and the outer peripheral surface ofcircular plate 251. Thus, the inner chamber of cupshaped portion 12 is partitioned into two chambers bycircular plate 251; a rear ordischarge chamber 30, in whichlegs 253 are disposed, and a front orsuction chamber 31, in whichspiral element 251 offixed scroll 25 is disposed. - Cup chaped
casing 12 is provided with afluid inlet port 35 and afluid outlet port 36, which respectively are connected to the front andrear chambers discharge port 254 is formed through the circular plate 251.at a position near to the center ofspiral element 252.Discharge port 254 connects the fluid pocket formed in the center of the interfitting spiral element andrear chamber 30. -
Orbiting scroll 26 is disposed infront chamberer 31. orbitingscroll member 26 also comprises acircular end plate 261 and a wrap orspiral element 262 affixed to or extending from one side surface ofcircular end plate 261.Spiral element 262 andspiral element 252 inter-fit at angular offset of 180° and a predetermined radial offset. A pair of fluid pockets are thereby defined betweenspiral elements Orbiting scroll 26 is connected to the drive mechanism and to the rotation preventing/thrust bearing mechanism. These last two mechanisms effect orbital motion of theorbiting scroll member 26 by rotation ofdrive shaft 13, to thereby compress fluid passing through the compressor unit. - The driving mechanism of orbiting
scroll 26 will be described. Driveshaft 13, which is rotatably supported by sleeve portion 17 throughball bearing 19, is formed with disk-rotor 131.Disk rotor 131 is rotatably supported byfront end plate 11 throughball bearing 16 disposed within opening 111 offront end plate 11. - A crank pin or drive
pin 15 projects axially inwardly from an end surface ofdisk rotor 131 and is radially offset from the center ofdrive shaft 13.Circular plate 261 of orbitingscroll 26 is provided with atubular boss 263 projecting axially, outwardly from the end surface opposite to the side from which spiralelement 262 extends. A discoid or shortaxial bushing 33 is fitted intoboss 263, and is rotatably supported therein by a bearing, such as aneedly bearing 34.Bushing 33 has abalance weight 331 which is shaped as a portion of a disk or ring and extends radially from bushing 33 along a front surface thereof. An eccentric hole is formed inbushing 33 radially offset from the center ofbushing 33. Drivepin 15 is fitted into the eccentricallydisposed hole 332, within which a bearing may be inserted.Bushing 33 is therefore driven by the revolution ofdrive pin 15 and permitted to rotate byneedle bearing 34. The spiral element of orbitingscroll 26 is thus pushed against the spiral element of fixedscroll 25 due to the moment created between the driving point and the reaction force acting point of the pressurized gas. - The rotation preventing/
thrust bearing device 37 will be explained. Rotation preventing/thrust bearing device 37 is placed between the inner end surface offront end plate 11 and the end surface ofcircular end plate 261 of orbitingscroll 26 which faces the inner end surface offront end plate 11. Rotation preventing/thrust bearing device 37 includes a fixed ring 371 which is fastened against the inner end surface offront end plate 11, an orbiting ring 372 which is fastened against the end surface ofcircular end plate 261, and bearing elements, such as a plurality ofspherical balls 373. As shown in Figures, both ring 371 and 372 are formed byseparate plate elements 371a and 372a, and ring elements 371b and 372b which have the plurality of pairs ofholes - In operation, the rotation of orbiting
scroll 26 is prevented byballs 373, which interact with the edges ofholes balls 373 carry the axial thrust load from orbitingscroll 26. Thus, orbitingscroll 26 orbits while maintaining its angular orientation with respect to fixedscroll 25. - The cup-shaped
casing 12 is formed with afluid inlet port 35 and thisfluid inlet port 35 is located in thecasing 12 at a location radially outwardly of and at the same axial location as a portion of the rotation preventing/thrust bearing device 37. Therefore, the refrigerant gas which is introduced into thesuction chamber 31 through thefluid inlet port 35 strikes against a part of the rotation preventing/thrust bearing device 37. The lubricating oil, which exists within the refrigerant gas as an oil mist, is separated from the suction gas. After separating, the oil adheres to the balls and to the surfaces of the orbiting and fixed rings which are contacted by the rolling surfaces of the balls, and lubricates the rolling surfaces. The suction gas also cools and lubricates parts of the bearing portion disposed within cup-shapedcasing 12. - Now, an embodiment of the present invention will be described with reference to Figure 1. The compressor shown in Figure 1 is similar to the known compressor of Figure 2 except for its lubricating system. Therefore, only a part of the compressor, including the lubricating system, is shown. The remaining portion of the compressor is omitted for the purpose of simplification of the drawings. Similar parts are represented by the same reference numerals as in Figure 2 except for parts of the lubricating system.
- Referring to Figure 2, a
fluid inlet port 2 of the lubricating system is formed in cup shapedhousing 12 and extends radially and outwardly of orbitingscroll 26 insuction chamber 31. - During operation of the compressor, an oil misted refrigerant gas is introduced through
fluid inlet port 2 intosuction chamber 31. - The interior of sleeve portion 17 is connected to an opening 111 in
front end plate 11 to form a shaft seal cavity 6. In the shaft seal cavity 6, ashaft seal assembly 20 is mounted ondrive shaft 13. - A lubricating system for the compressor will now be described. A
step portion 2a is formed in thefluid inlet port 2.Step portion 2a projects radially inwardly from an inner wall offluid inlet port 2. A flange 2b is formed along the inner end portion ofstep portion 2a and is generally perpendicular to stepportion 2a to accumulate and separate oil atstep portion 2a. Flange 2b projects radially outward fromstep portion 2a as viewed with respect to the rotational axis ofshaft 13. Cup shaped casing 12 is formed with afirst oil passageway 4 one end of which opens at the inner wall offluid inlet port 2.First oil passageway 4 is connected with asecond oil passageway 5 which opens at the inner wall of shaft seal cavity 6. The shaft seal cavity in whichshaft seal assembly 20 is disposed is thus connected withfluid inlet port 2 throughoil passageways - In this construction, during the operation of the compressor, the refrigerant gas is introduced into
suction chamber 31 throughinlet port 2. The oil mist suction gas strikes against step portion 2aq. The oil included with the suction gas is separated therefore and accumulates onstep portion 2a. Following the flow of suction gas, the accumulated oil flows intofirst oil passageway 4, and then flows out to the shaft seal cavity 6 offront end plate 11 throughsecond oil passageway 5. The oil which flows into the shaft seal cavity lubricates and cools theshaft seal assembly 20 and returns to thesuction chamber 31 through bearing 16 while lubricatingbearing 16.
Claims (3)
- A scroll type compressor including a housing (10) comprising a front end plate (11) and a cup shaped casing (12), a fixed scroll (25) fixedly disposed within said housing (10) and having a fixed scroll end plate (251) from which a first wrap (252) extends, an orbiting scroll (26) having an orbiting scroll end plate (261) from which a second wrap (262) extends, said first and second wraps (252, 262) interfitting at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets, a driving mechanism operatively connected with said orbiting scroll (26) to effect the orbital motion of said orbiting scroll (26) while preventing the rotation of said orbiting scroll (26), and thus changing the volume of said fluid pockets due to the orbital motion of said orbiting scroll (26),
a fluid inlet port (2) formed in said cup shaped casing (12) radially outwardly of said orbiting scroll for introducing an oil misted gas into the interior of the housing (10), said fluid inlet port (2) having a step portion (2a) projecting radially inwardly from an inner wall of said fluid inlet port (2);
a first lubricant passageway (4) having one end opening to the inner wall of said fluid inlet port (2) adjacent to said step portion (2a); and
a second lubricant passageway (5) formed through said front end plate (11), said second lubricant passageway (5) connecting said first lubricant passageway (4) and a shaft seal cavity formed in said front end plate (11) so that lubricant separates from incoming gas to be compressed on said step portion (2a) and passes thereform to said seal cavity through said first and second lubricant passageways (4,5). - The scroll type compressor of claim 1 characterised in that said step portion (2a) has flange (2b) formed on it and generally perpendicular to the radially inner end portion of said step portion (2a).
- The scroll compressor according to claim 1 or 2, characterised by lubricant passageway means for conveying lubricant from said shaft seal cavity to an intake chamber of the scroll type compressor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP87103234A EP0240739B1 (en) | 1982-09-30 | 1983-09-30 | Scroll type compressor with lubricating system |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1982148267U JPS5952193U (en) | 1982-09-30 | 1982-09-30 | Scroll compressor |
JP148267/82U | 1982-09-30 | ||
EP87103234A EP0240739B1 (en) | 1982-09-30 | 1983-09-30 | Scroll type compressor with lubricating system |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP83305951.2 Division | 1983-09-30 |
Publications (2)
Publication Number | Publication Date |
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EP0240739A1 EP0240739A1 (en) | 1987-10-14 |
EP0240739B1 true EP0240739B1 (en) | 1991-03-20 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP87103234A Expired - Lifetime EP0240739B1 (en) | 1982-09-30 | 1983-09-30 | Scroll type compressor with lubricating system |
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EP (1) | EP0240739B1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH10205467A (en) * | 1997-01-27 | 1998-08-04 | Sanden Corp | Scroll compressor |
JP4246826B2 (en) * | 1998-12-14 | 2009-04-02 | サンデン株式会社 | Scroll compressor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3874827A (en) * | 1973-10-23 | 1975-04-01 | Niels O Young | Positive displacement scroll apparatus with axially radially compliant scroll member |
US4082484A (en) * | 1977-01-24 | 1978-04-04 | Arthur D. Little, Inc. | Scroll-type apparatus with fixed throw crank drive mechanism |
EP0009350A1 (en) * | 1978-09-04 | 1980-04-02 | Sanden Corporation | Scroll-type fluid compressor units |
EP0012616A1 (en) * | 1978-12-16 | 1980-06-25 | Sanden Corporation | Scroll-type fluid compressor unit |
-
1983
- 1983-09-30 EP EP87103234A patent/EP0240739B1/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3874827A (en) * | 1973-10-23 | 1975-04-01 | Niels O Young | Positive displacement scroll apparatus with axially radially compliant scroll member |
US4082484A (en) * | 1977-01-24 | 1978-04-04 | Arthur D. Little, Inc. | Scroll-type apparatus with fixed throw crank drive mechanism |
US4082484B1 (en) * | 1977-01-24 | 1983-06-21 | ||
EP0009350A1 (en) * | 1978-09-04 | 1980-04-02 | Sanden Corporation | Scroll-type fluid compressor units |
EP0012616A1 (en) * | 1978-12-16 | 1980-06-25 | Sanden Corporation | Scroll-type fluid compressor unit |
Also Published As
Publication number | Publication date |
---|---|
EP0240739A1 (en) | 1987-10-14 |
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