EP0240739B1 - Système de lubrification pour compresseur à volutes - Google Patents

Système de lubrification pour compresseur à volutes Download PDF

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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
Authority
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
Application number
EP87103234A
Other languages
German (de)
English (en)
Other versions
EP0240739A1 (fr
Inventor
Kiyoshi Terauchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanden Corp
Original Assignee
Sanden Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1982148267U external-priority patent/JPS5952193U/ja
Application filed by Sanden Corp filed Critical Sanden Corp
Priority to EP87103234A priority Critical patent/EP0240739B1/fr
Publication of EP0240739A1 publication Critical patent/EP0240739A1/fr
Application granted granted Critical
Publication of EP0240739B1 publication Critical patent/EP0240739B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Claims (3)

  1. Compresseur de type à volutes comprenant un carter (10) muni d'une plaque d'extrémité avant (11) et d'un boîtier en forme de coupelle (12), une volute fixe (25) montée de façon fixe à l'intérieur du carter (10) et munie d'une plaque d'extrémité de volute fixe (251) sur laquelle fait saillie un premier enroulement de spirale (252), une volute orbitale (26) munie d'une plaque d'extrémité de volute orbitale (261) sur laquelle fait saillie un second enroulement de spirale (262), ce premier et second enroulement de spirales (252, 262) s'emboîtant avec un décalage angulaire et radial de manière à former un certain nombre de lignes de contact pour définir au moins une paire de poches à fluide étanches, un mécanisme d'entraînement relié en fonctionnement à la volute orbitale (26) pour produire le mouvement orbital de la volute orbitale (26), de manière à modifier ainsi le volume des poches à fluide du fait du mouvement orbital de la volute orbitale (26),
    un orifice d'entrée de fluide (2) formé dans le boîtier en forme de coupelle (12) et dirigé radialement vers l'extérieur de la volute orbitale pour introduire un gaz contenant un brouillard d'huile à l'intérieur du carter (10), cet orifice d'entrée de fluide (2) comportant une partie de gradin (2a) faisant saillie radialement vers l'intérieur sur une paroi intérieure de l'orifice d'entrée de fluide (2);
    un premier passage de lubrifiant (4) comportant une extrémité débouchant dans la paroi intérieure de l'orifice d'entrée de fluide (2) au voisinage de la partie de gradin (2a); et
    un second passage de lubrifiant (5) formé à travers la plaque d'extrémité avant (11), ce second passage de lubrifiant (5) reliant le premier passage de lubrifiant (4) à la cavité d'étanchéité d'arbre formée dans la plaque d'extrémité avant (11) de façon que le lubrifiant se sépare du gaz incident à comprimer sur la partie de gradin (2a) et passe de celle-ci dans la cavité d'étanchéité d'arbre par le premier et second passage de lubrifiant (4, 5).
  2. Compresseur de type à volutes selon la revendication 1, caractérisé en ce que la partie de gradin (2a) comporte un rebord (2b) formé sur celle-ci et disposé d'une façon générale perpendiculairement à la partie d'extrémité radialement intérieure de la partie de gradin (2a).
  3. Compresseur à volutes selon l'une quelconque des revendication 1 et 2, caractérisé en ce qu'il comprend des moyens de passage de lubrifiant destinés à transporter le lubrifiant de la cavité d'étanchéité d'arbre vers une chambre d'admission du compresseur de type à volutes.
EP87103234A 1982-09-30 1983-09-30 Système de lubrification pour compresseur à volutes Expired - Lifetime EP0240739B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP87103234A EP0240739B1 (fr) 1982-09-30 1983-09-30 Système de lubrification pour compresseur à volutes

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP1982148267U JPS5952193U (ja) 1982-09-30 1982-09-30 スクロ−ル型圧縮機
JP148267/82U 1982-09-30
EP87103234A EP0240739B1 (fr) 1982-09-30 1983-09-30 Système de lubrification pour compresseur à volutes

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP83305951.2 Division 1983-09-30

Publications (2)

Publication Number Publication Date
EP0240739A1 EP0240739A1 (fr) 1987-10-14
EP0240739B1 true EP0240739B1 (fr) 1991-03-20

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Application Number Title Priority Date Filing Date
EP87103234A Expired - Lifetime EP0240739B1 (fr) 1982-09-30 1983-09-30 Système de lubrification pour compresseur à volutes

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10205467A (ja) * 1997-01-27 1998-08-04 Sanden Corp スクロールコンプレッサ
JP4246826B2 (ja) * 1998-12-14 2009-04-02 サンデン株式会社 スクロール型圧縮機

Citations (4)

* Cited by examiner, † Cited by third party
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 (fr) * 1978-09-04 1980-04-02 Sanden Corporation Compresseurs du type à spirale
EP0012616A1 (fr) * 1978-12-16 1980-06-25 Sanden Corporation Compresseur à fluide du type à spirales imbriquées

Patent Citations (5)

* Cited by examiner, † Cited by third party
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 (fr) * 1977-01-24 1983-06-21
EP0009350A1 (fr) * 1978-09-04 1980-04-02 Sanden Corporation Compresseurs du type à spirale
EP0012616A1 (fr) * 1978-12-16 1980-06-25 Sanden Corporation Compresseur à fluide du type à spirales imbriquées

Also Published As

Publication number Publication date
EP0240739A1 (fr) 1987-10-14

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