EP0967392A1 - Scroll type compressor in which an oil seal is formed between an involute wall and an end plate confronting with the involute wall in an axial direction - Google Patents

Scroll type compressor in which an oil seal is formed between an involute wall and an end plate confronting with the involute wall in an axial direction Download PDF

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Publication number
EP0967392A1
EP0967392A1 EP99112107A EP99112107A EP0967392A1 EP 0967392 A1 EP0967392 A1 EP 0967392A1 EP 99112107 A EP99112107 A EP 99112107A EP 99112107 A EP99112107 A EP 99112107A EP 0967392 A1 EP0967392 A1 EP 0967392A1
Authority
EP
European Patent Office
Prior art keywords
type compressor
shallow groove
scroll type
scroll
involute
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.)
Withdrawn
Application number
EP99112107A
Other languages
German (de)
English (en)
French (fr)
Inventor
Satoru Saito
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
Application filed by Sanden Corp filed Critical Sanden Corp
Publication of EP0967392A1 publication Critical patent/EP0967392A1/en
Withdrawn legal-status Critical Current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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/02—Liquid sealing for high-vacuum pumps or for compressors
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/005—Axial sealings for working fluid

Definitions

  • the present invention relates in general to a compressor used for refrigerating air conditioners and more particularly to a scroll type compressor known in the art.
  • a conventional scroll type compressor includes a fixed scroll member and a movable scroll member confronting with the fixed scroll member in an axial direction.
  • the fixed scroll member is fixed to a casing and comprises an end plate extending perpendicular to the axial direction and an involute wall connected integral with the end plate.
  • the movable scroll member is unrotationally but orbitally moved in the casing and comprises an end plate extending perpendicular to the axial direction and an involute wall connected integral with the end plate.
  • a plurality of compression spaces or chambers are defined between the fixed and the movable scroll members in the manner known in the art.
  • a hatched portion 1 represents one of the compression chambers. There are additional five compression chambers (not hatched) are formed in the drawing. The compression chambers thus formed become smaller in size as it goes to the center of the involutes and, in other words, the gas taken from the outer circumferential portion (hatched portion) is compressed and become a compressed gas at the compression chamber located at the central portion.
  • the involute wall 2 of the movable scroll member is provided with a deep groove 4 at its upper end surface.
  • a chip seal 5 is placed in the deep groove 4 for filling a gap relative to a bottom plate 6 which is placed between the end plate 7 of the fixed scroll member and the involute wall 2 of the movable scroll member. Therefore, a gas is prevented from leakage thereof by the application of the chip seal 5.
  • a similar construction is applied between the involute wall of the fixed scroll member and the end plate of the movable scroll member.
  • the chip seal method requires more parts and elements and results in some trouble and difficulty in assembly of the elements and also results in higher cost in production. Further, working of the deep groove 4 for the chip seal 5 requires an advanced technique and longer time of working. In addition, the chip seal method requires the deep groove 4 to be engraved for snugly fitting therein the chip seal 5, for example, as deep as 1.4 mm in case of a chip seal groove for compressor of a refrigerating air conditioner. Therefore, a relatively long time needs for working and processing. Further, use of the chip seal 5 requires a great number of parts and elements to be assembled and more steps for assembly and, therefore, results in an increase of the cost for production and assembly.
  • a scroll type compressor to which the present invention is applicable uses lubricant oil and includes a pair of scroll members confronting with each other in an axial direction.
  • Each of the scroll members comprises an end plate extending perpendicular to the axial direction and an involute wall having a first and a second axial end which are opposite to each other in the axial direction.
  • the first axial end is connected to the end plate.
  • the second axial end confronts with the end plate of a counterpart one of the scroll members.
  • the second axial end of at least one of the scroll members has a shallow groove with a depth for suitably holding therein the lubricant oil to form an oil seal between the second axial end and the end plate that confronts with the second axial end.
  • the scroll type compressor comprises a casing 11 and movable and fixed scroll members 20 and 30 which are contained in the casing 11 and confront with each other in an axial direction.
  • the movable and the fixed scroll members 20 and 30 have involute members 26 and 36 end plates 22 and 32, respectively.
  • Each of the involute walls 21 and 31 has a first and a second axial end which are opposite to each other in the axial direction.
  • the first axial end is connected integral with each of the end plate.
  • the second axial end confronts with the end plate of a counterpart one of the movable and the fixed scroll members 20 and 30.
  • bottom plates 23 and 33 are placed on the end plates 22 and 32.
  • the movable and the fixed scroll members 20 and 30 are engaged with each other in a confronting relation with their involute curves offset at 180 angular degrees with each other. As a result, a plurality of compression spaces are defined between the movable and the fixed scroll members 20 and 30 in the manner known in the art.
  • the fixed scroll member 30 is fixed in the casing 11.
  • the movable scroll member 20 is unrotationally but orbitally movably supported, in a front housing 14, on the side opposite to the side of the involute member 21 of the end plate 22 through a rotation-preventive mechanism 15. So that, the movable scroll member 20 provides an orbital motion along its orbital way.
  • a boss portion 23 in the form of projection is disposed nearer to the central portion of the end plate 22 of the movable scroll member 20.
  • the driving mechanism comprises an enlarged portion 40b disposed at an end of the driving shaft 40a, an eccentric pin 40c disposed on the opposite side of the driving shaft 40a of the enlarged portion 40b, and an eccentric bush 17 disposed in the boss portion 23 through a drive bearing 18 to permit an orbital motion of the movable scroll member 20.
  • the boss portion 23 serves to rotatably support the eccentric bush 17 through the drive bearing 18.
  • a shallow groove 26 is provided along the second axial end of the involute wall 21 of the movable scroll member, a hatched portion representing the shallow groove 26.
  • the shallow groove 26 continuously extends from a center portion of the involute wall 21 towards a peripheral portion thereof to form an involute shape known in the art.
  • the shallow groove 26 is cooperated with the bottom plate 33 to form a space for storing therein a lubricant oil generally used in the scroll type compressor. So that, an oil seal is formed by the lubricant oil between the second axial end of the involute member 26 and the bottom plate 33 to prevent a gas leakage.
  • the oil seal 41 is formed by the lubricant oil extending from the shallow groove 26 between the involute wall 21 of the movable scroll member and the bottom plate 33 of the fixed scroll member. It was found that the oil seal 41 serves to prevent leakage of a compressed gas housed in the compression space 42 defined between the movable and the fixed scroll members. Now, it will be essential that the shallow groove 26 has such a depth as to provide an oil reservoir and, in addition, the oil seal 41 in order to obtain the effects and advantages as described above.
  • the shallow groove 26 should be designed to have a desired depth that it is capable of capturing effect of the lubricant oil and formation of the oil seal.
  • the depth of the shallow groove 26 is required to provide a function of serving as an oil reservoir and a condition of forming the oil seal and it was found that desirable range of the depth is about 0.02mm-0.2mm.
  • the shallow groove 26 is easily formed since it has less depth. In the case of a compressor for a refrigerator, an experimental test of performance proved to be substantially equivalent to that of the convention structure when the depth of the shallow groove 26 is 0.05mm.
  • the description will be directed to a mobility of the lubricant oil.
  • a flow-in and flow-out of the lubricant oil to and from the shallow groove 26 are balanced with each other, it is considered that a sort of a mobile or movable seal is formed depending upon a relation between a viscosity of the lubricant and a flowing speed of it.
  • the oil seal is broken to result in formation of a flow of an air layer (refrigerant) in a gap and/or reduction or damage of a function as the oil reservoir.
  • a shallow groove 36 is provided along the second axial end of the involute wall 31 of the movable scroll member 30.
  • the shallow groove 36 has a structure which is similar to that of the shallow groove 26 described above. Therefore, detail description will be omitted as regards the shallow groove 36.
  • a hatched portion represents the shallow groove 26.
  • the shallow groove 21 is made only at a central portion of the involute wall 21 of the movable scroll member 20.
  • the shallow groove 26 With reference to Fig. 8, the description will be made as regards another modification of the shallow groove 26. Hatched portions represent the shallow groove 26.
  • the shallow groove 26 intermittently extends from the central portion of the involute wall 21 towards the peripheral portion thereof.
  • the shallow groove 26 comprises a plurality of groove portions 43 which are adjacent to each other along an involute curve of the involute wall 21 with a ungrooved stop 44 between the adjacent groove portions 43.
  • gas leakage prevention is concentrated on the prevention of leakage of the compressed gas. This is because a gas pressure is not so large at the compression chambers located at the outer circumferential portion of the involute members 1 and therefore possibility of gas leakage at these low pressure compression chambers is not so high.
  • an oil supplying arrangement is provided to the central portion for supplying the lubricant oil in the manner that will presently be described.
  • two lubricant supply holes 46 and 47 are formed as the oil supplying arrangement to penetrate the fixed scroll member 30.
  • One of the lubricant supply holes 46 is for connecting the shallow groove 26 of the movable scroll member 20 with the discharge chamber 39.
  • Another of the lubricant supply holes 46 is for connecting the shallow groove 36 of the fixed scroll member 30 with the discharge chamber 39.
  • the discharge chamber 39 has a higher pressure than the shallow grooves 26 and 36 and, therefore, permits the gas containing the lubricant oil flows to the shallow grooves 26 and 36 so that the lubricant oil can be supplied to the shallow grooves 26 and 36.
  • each of the lubricant supply holes 46 and 47 is designed to have a diameter large enough not to decrease the compression properties.
  • lubricant supply grooves 48 and 49 are formed as the oil supplying arrangement at central end portions of the involute walls 21 and 31 to connect the compression chamber 42 with the shallow grooves 26 and 36, respectively.
  • Each of the lubricant supply grooves 48 and 49 has a depth and a width so that the compression properties are not decreased.
  • the lubricant oil is supplied from the compression chamber 42 to the shallow grooves 26 and 36 through the lubricant supply grooves 48 and 49. It is satisfactory that a thin groove is merely formed at the central portion of the involute walls 21 and 31 so that the groove is connected between each of the shallow grooves 26 and 36 and the compression chamber 42. Therefore, it requires no special working technique and less working time.
  • a sealing effect can be obtained without providing a chip seal and complex assembly steps are not required. Further, the number of parts and elements can be reduced and consequently assembly time and cost can be reduced with improvement in cost performance. Further, since mere replacement of the conventional chip seal groove with a new shallow groove in the production step of the involute members is quite satisfactory to provide the inventive structure of the scroll type compressor, the production step and procedure can be used without any change. By a mere change or replacement of the relatively deep groove for the chip seal, that is, about 1.4 mm, with the shallow groove as described above, a lubricant can be stored in the shallow groove. So that, the oil seal is produced, and consequently, gas leakage can be prevented effectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
EP99112107A 1998-06-23 1999-06-23 Scroll type compressor in which an oil seal is formed between an involute wall and an end plate confronting with the involute wall in an axial direction Withdrawn EP0967392A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP17579398 1998-06-23
JP17579398A JP4153085B2 (ja) 1998-06-23 1998-06-23 スクロール型圧縮機

Publications (1)

Publication Number Publication Date
EP0967392A1 true EP0967392A1 (en) 1999-12-29

Family

ID=16002355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99112107A Withdrawn EP0967392A1 (en) 1998-06-23 1999-06-23 Scroll type compressor in which an oil seal is formed between an involute wall and an end plate confronting with the involute wall in an axial direction

Country Status (4)

Country Link
EP (1) EP0967392A1 (ja)
JP (1) JP4153085B2 (ja)
AU (1) AU3578699A (ja)
CA (1) CA2276787A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2387879B (en) * 2001-02-01 2005-06-29 Robert W Shaffer Scroll vacuum pump with improved performance
US7329109B2 (en) * 2005-05-18 2008-02-12 Scroll Technologies Oil retention in scroll compressor pump members

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005010372A1 (ja) * 2003-07-24 2005-02-03 Matsushita Electric Industrial Co., Ltd. スクロール圧縮機
JP4501628B2 (ja) * 2004-10-20 2010-07-14 パナソニック株式会社 スクロール圧縮機の製造方法
JP4635660B2 (ja) * 2005-03-14 2011-02-23 パナソニック株式会社 スクロール圧縮機
JP4576306B2 (ja) * 2005-08-29 2010-11-04 三菱重工業株式会社 スクロール圧縮機および空気調和機

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5421707A (en) * 1994-03-07 1995-06-06 General Motors Corporation Scroll type machine with improved wrap radially outer tip
US5562434A (en) * 1995-04-17 1996-10-08 Matsushita Electric Industrial Co., Ltd. Scroll compressor having optimized tip seal grooves
EP0840012A1 (en) * 1996-10-30 1998-05-06 Carrier Corporation Scroll compressor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5421707A (en) * 1994-03-07 1995-06-06 General Motors Corporation Scroll type machine with improved wrap radially outer tip
US5562434A (en) * 1995-04-17 1996-10-08 Matsushita Electric Industrial Co., Ltd. Scroll compressor having optimized tip seal grooves
EP0840012A1 (en) * 1996-10-30 1998-05-06 Carrier Corporation Scroll compressor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2387879B (en) * 2001-02-01 2005-06-29 Robert W Shaffer Scroll vacuum pump with improved performance
US7329109B2 (en) * 2005-05-18 2008-02-12 Scroll Technologies Oil retention in scroll compressor pump members

Also Published As

Publication number Publication date
JP2000009064A (ja) 2000-01-11
CA2276787A1 (en) 1999-12-23
AU3578699A (en) 2000-01-06
JP4153085B2 (ja) 2008-09-17

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