EP1632646A1 - Scroll fluid machine - Google Patents
Scroll fluid machine Download PDFInfo
- Publication number
- EP1632646A1 EP1632646A1 EP04021089A EP04021089A EP1632646A1 EP 1632646 A1 EP1632646 A1 EP 1632646A1 EP 04021089 A EP04021089 A EP 04021089A EP 04021089 A EP04021089 A EP 04021089A EP 1632646 A1 EP1632646 A1 EP 1632646A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- orbiting
- scroll
- stationary
- end plate
- expanding
- 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.)
- Granted
Links
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/02—Rotary-piston machines or engines 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
- F01C1/0207—Rotary-piston machines or engines 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 both members having co-operating elements in spiral form
- F01C1/0215—Rotary-piston machines or engines 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 both members having co-operating elements in spiral form where only one member is moving
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/02—Rotary-piston machines or engines 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
- F01C1/0207—Rotary-piston machines or engines 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 both members having co-operating elements in spiral form
- F01C1/0246—Details concerning the involute wraps or their base, e.g. geometry
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C11/00—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type
- F01C11/002—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type of similar working principle
- F01C11/004—Combinations of two or more machines or engines, each being of rotary-piston or oscillating-piston type of similar working principle and of complementary function, e.g. internal combustion engine with supercharger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/06—Heating; Cooling; Heat insulation
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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
Definitions
- the present invention relates to a scroll fluid machine and especially to a scroll fluid machine that enables itself to be cooled effectively.
- JP 2003-307188A filed by the same applicant discloses a scroll fluid machine comprising stationary and orbiting scrolls, the orbiting scroll being driven and revolved with respect to the stationary scroll to create outer compressing and inner expanding regions between stationary and orbiting scroll wraps of the stationary and orbiting scrolls.
- Fluid expanded and cooled in the expanding region between inner stationary and orbiting wraps flows through a discharge bore to the rear surface of an orbiting end plate. Fluid flows from the rear surface of the orbiting end plate via the outer circumference of a blocking plate to an electric motor. In the scroll fluid machine, the rear surface of the orbiting end plate is effectively cooled.
- a central bearing is provided between the orbiting end plate and an eccentric portion of a driving shaft in a boss of the orbiting end plate.
- the driving shaft is driven by the electric motor and the orbiting end plate is revolved by the eccentric portion of the driving shaft. Then, the compressing and expanding regions are created between the stationary and orbiting scrolls.
- the bearing is subjected to rotation of the driving shaft and heated thereby decreasing durability.
- a scroll fluid machine comprising a driving shaft having an eccentric portion; a stationary scroll having a stationary end plate from which an inner stationary wrap projects ; an orbiting scroll having an orbiting end plate from which an inner orbiting wrap projects, and a boss in which the eccentric portion is fitted via a central bearing; and an inner annular partition wall mounted to the stationary or orbiting end plate, said inner orbiting wrap being revolved by the eccentric portion of the driving shaft to engage with said inner stationary wrap inside the inner partition wall to form an expanding region, characterized in that an expanding cover that has an inward-projecting portion is mounted to the orbiting end plate to surround the boss to form a narrower space between the inward-projecting portion and the boss, fluid from the expanding region being passed through the narrower space and further depressurized or cooled.
- FIGs. 1 and 2 illustrate an embodiment of a scroll fluid machine according to the present invention, comprising a scroll portion 10 and an electric motor 20.
- a stationary end plate 1' of a stationary scroll 1 has an inner annular partition wall 101; an outer annular partition wall 102; an outer stationary wrap 1 a between the inner and outer partition walls 101 and 102; and an inner stationary wrap 1b inside the inner partition wall 101.
- An orbiting end plate 2' of an orbiting scroll 2 has an outer orbiting wrap 2a that engages with the outer stationary wrap 1 a; and an inner orbiting wrap 2b that engages with the inner stationary wrap 1b.
- the orbiting scroll 2 is covered with a housing 3 fixed to the stationary scroll 1.
- An electric motor 20 is fixed to a wall 3' of the housing 3 by a bolt 26.
- Journals 21 a and 21 b of a driving shaft 21 of the electric motor 20 are rotatably supported by the housing 3 and a rear cover 25 of the electric motor 20 by bearings 8 and 23 respectively so that an axis of the driving shaft 21 may coincide with the center of the stationary scroll 1.
- Three bosses 5 protrude near the outer periphery of the orbiting scroll 2 like an equilateral triangle, and a pin 7a at one end of an auxiliary crank 7 is rotatably supported in each of the bosses 5 via a bearing 9a.
- the pins 7a, 7b are provided eccentrically by a certain amount.
- An eccentric portion 21 is formed at one end of the driving shaft 21 and supports a boss 4 at the center of the rear surface of the orbiting end plate 2' via a bearing 22.
- the eccentric portion 21 c has the same eccentricity as that of the pins 7a,7b of the auxiliary crank 7. Owing to such structure, when the driving shaft 21 is rotated, the orbiting scroll 2 is revolved around the axis of the driving shaft 21.
- the revolution mechanism may be a known means such as Oldham coupling. As shown in Fig. 2, with respect to a spiral direction of the scroll wrap, the inner scroll wraps are wound in a counterclockwise direction from the center, and the outer scroll wraps are wound in a clockwise direction from the annular wall.
- Numeral 24 denotes a seal
- 27,28 denote elastic rings.
- the elastic ring 27 when the elastic ring 27 made of hard rubber is fitted in a bore of the eccentric portion 21c, the elastic ring 27 prevents the inner ball from rotating on the eccentric portion 21c owing to friction after fitting of the inner ball while resistance is small during fitting of the inner ball.
- the elastic ring 28 facilitates the pin portion 7a of the auxiliary crank 7 to insert into the bearing 9a of the orbiting scroll 2 and prevents the inner ball of the bearing 9a from sliding.
- Fluid is sucked through the inlet 11, compressed in the compressing region by engagement of the outer scroll wraps 1 a and 2a between the inner and outer partition walls 101 and 102 and discharged through the outlet 12. Fluid is sucked through the inlet 13, expanded in the expanding region by engagement of the inner scroll wraps 1b and 2b inside the inner partition wall 101 and discharged through the outlet 13.
- the orbiting scroll end plate 2' has an expanded fluid discharge bore 103 communicating with the expanding region, The fluid expanded in the expanding region is discharged not only through the outlet 14 of the stationary scroll end plate 1' but also through the discharge bore 103 of the orbiting scroll end plate 2'.
- An expanding cover 120 is mounted to the orbiting end plate 2' and has a support plate 121 between the boss 4 of the orbiting end plate 2' and the expanding cover 120.
- the support plate 121 has an annular bore 122
- the expanding cover 120 has an inward-projecting portion 123.
- the fluid from the discharge bore 103 passes through the annular bore 122 of the support plate 121 and through a narrower space 124 between the inward-projecting portion 123 and the boss 4. In the narrower space 124, the fluid becomes faster and is depressurized, so that the fluid is further cooled.
- the orbiting end plate 2' is driven by the eccentric portion 21c of the driving shaft 21, so that a central bearing 125 between the boss 4 and the eccentric portion 21c is heated during rotation of the eccentric portion 21c.
- the cooling fluid which flows through the narrower space 124 near the boss 4 effectively cools the central bearing 125, thereby increasing durability of the bearing 125.
- a scroll fluid machine is utilized to feed air into a fuel cell and discharge it or as an air-expanding cooler.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Rotary Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
- The present invention relates to a scroll fluid machine and especially to a scroll fluid machine that enables itself to be cooled effectively.
- JP 2003-307188A filed by the same applicant discloses a scroll fluid machine comprising stationary and orbiting scrolls, the orbiting scroll being driven and revolved with respect to the stationary scroll to create outer compressing and inner expanding regions between stationary and orbiting scroll wraps of the stationary and orbiting scrolls. Fluid expanded and cooled in the expanding region between inner stationary and orbiting wraps flows through a discharge bore to the rear surface of an orbiting end plate. Fluid flows from the rear surface of the orbiting end plate via the outer circumference of a blocking plate to an electric motor. In the scroll fluid machine, the rear surface of the orbiting end plate is effectively cooled.
- Meanwhile, a central bearing is provided between the orbiting end plate and an eccentric portion of a driving shaft in a boss of the orbiting end plate. The driving shaft is driven by the electric motor and the orbiting end plate is revolved by the eccentric portion of the driving shaft. Then, the compressing and expanding regions are created between the stationary and orbiting scrolls. The bearing is subjected to rotation of the driving shaft and heated thereby decreasing durability.
- In view of the disadvantage, it is an object of the present invention to provide a scroll fluid machine in which a central bearing in a boss of an orbiting end plate is effectively cooled thereby increasing durability.
- According to the present invention, there is provided a scroll fluid machine comprising a driving shaft having an eccentric portion; a stationary scroll having a stationary end plate from which an inner stationary wrap projects ; an orbiting scroll having an orbiting end plate from which an inner orbiting wrap projects, and a boss in which the eccentric portion is fitted via a central bearing; and an inner annular partition wall mounted to the stationary or orbiting end plate, said inner orbiting wrap being revolved by the eccentric portion of the driving shaft to engage with said inner stationary wrap inside the inner partition wall to form an expanding region, characterized in that an expanding cover that has an inward-projecting portion is mounted to the orbiting end plate to surround the boss to form a narrower space between the inward-projecting portion and the boss, fluid from the expanding region being passed through the narrower space and further depressurized or cooled.
-
- Fig. 1 is a vertical sectional side view of an embodiment of a scroll fluid machine according to the present invention; and
- Fig. 2 is a sectional view taken along the line II-II in Fig. 1.
- Figs. 1 and 2 illustrate an embodiment of a scroll fluid machine according to the present invention, comprising a
scroll portion 10 and anelectric motor 20. A stationary end plate 1' of astationary scroll 1 has an innerannular partition wall 101; an outerannular partition wall 102; an outerstationary wrap 1 a between the inner andouter partition walls stationary wrap 1b inside theinner partition wall 101. An orbiting end plate 2' of an orbitingscroll 2 has an outer orbitingwrap 2a that engages with the outerstationary wrap 1 a; and an inner orbitingwrap 2b that engages with the innerstationary wrap 1b. The orbitingscroll 2 is covered with ahousing 3 fixed to thestationary scroll 1. Anelectric motor 20 is fixed to a wall 3' of thehousing 3 by abolt 26.Journals driving shaft 21 of theelectric motor 20 are rotatably supported by thehousing 3 and arear cover 25 of theelectric motor 20 bybearings driving shaft 21 may coincide with the center of thestationary scroll 1. - Three
bosses 5 protrude near the outer periphery of theorbiting scroll 2 like an equilateral triangle, and apin 7a at one end of anauxiliary crank 7 is rotatably supported in each of thebosses 5 via abearing 9a. There are provided threebosses 6 on thestationary scroll 1 and apin 7b at the other end of thestationary scroll 1 in each of thebosses 6 via abearing 9b. Thepins eccentric portion 21 is formed at one end of the drivingshaft 21 and supports aboss 4 at the center of the rear surface of the orbiting end plate 2' via abearing 22. Theeccentric portion 21 c has the same eccentricity as that of thepins auxiliary crank 7. Owing to such structure, when thedriving shaft 21 is rotated, theorbiting scroll 2 is revolved around the axis of thedriving shaft 21. The revolution mechanism may be a known means such as Oldham coupling. As shown in Fig. 2, with respect to a spiral direction of the scroll wrap, the inner scroll wraps are wound in a counterclockwise direction from the center, and the outer scroll wraps are wound in a clockwise direction from the annular wall. - Numeral 24 denotes a seal, and 27,28 denote elastic rings. When an inner ball of the bearing is loosened from the
eccentric portion 21c so as to facilitate theeccentric portion 21c to insert into thebearing 8 of the orbiting scroll, theelastic rings pin portion 21c. - For example, when the
elastic ring 27 made of hard rubber is fitted in a bore of theeccentric portion 21c, theelastic ring 27 prevents the inner ball from rotating on theeccentric portion 21c owing to friction after fitting of the inner ball while resistance is small during fitting of the inner ball. Similarly, theelastic ring 28 facilitates thepin portion 7a of theauxiliary crank 7 to insert into thebearing 9a of the orbitingscroll 2 and prevents the inner ball of thebearing 9a from sliding. - On the end plate 1' of the
stationary scroll 1, there are acompressing portion inlet 11 inside theouter partition wall 102; acompressing portion outlet 12 outside theinner partition wall 101; an expandingportion outlet 14 inside theinner partition wall 101; and an expandingportion inlet 13 at the center. Pipes 11a, 12a, 14a, 13a are connected to theholes electric motor 20 is rotated in a counterclockwise direction seen from the right in Fig. 1, theorbiting scroll 2 is revolved in the counterclockwise direction around the center of thestationary scroll 1 as shown in Fig. 2 while theorbiting scroll 2 is prevented from rotation around its own axis. Thus, a compressing region is created between the inner andouter partition walls inner partition wall 101. - Fluid is sucked through the
inlet 11, compressed in the compressing region by engagement of theouter scroll wraps outer partition walls outlet 12. Fluid is sucked through theinlet 13, expanded in the expanding region by engagement of theinner scroll wraps inner partition wall 101 and discharged through theoutlet 13. - The orbiting scroll end plate 2' has an expanded
fluid discharge bore 103 communicating with the expanding region, The fluid expanded in the expanding region is discharged not only through theoutlet 14 of the stationary scroll end plate 1' but also through thedischarge bore 103 of the orbiting scroll end plate 2'. - An expanding
cover 120 is mounted to the orbiting end plate 2' and has asupport plate 121 between theboss 4 of the orbiting end plate 2' and the expandingcover 120. Thesupport plate 121 has anannular bore 122, and the expandingcover 120 has an inward-projectingportion 123. The fluid from the discharge bore 103 passes through theannular bore 122 of thesupport plate 121 and through anarrower space 124 between the inward-projectingportion 123 and theboss 4. In thenarrower space 124, the fluid becomes faster and is depressurized, so that the fluid is further cooled. - The orbiting end plate 2' is driven by the
eccentric portion 21c of thedriving shaft 21, so that acentral bearing 125 between theboss 4 and theeccentric portion 21c is heated during rotation of theeccentric portion 21c. The cooling fluid which flows through thenarrower space 124 near theboss 4 effectively cools thecentral bearing 125, thereby increasing durability of thebearing 125. - A scroll fluid machine according to the present invention is utilized to feed air into a fuel cell and discharge it or as an air-expanding cooler.
Claims (2)
- A scroll fluid machine comprising:a driving shaft 21 having an eccentric portion 21c;a stationary scroll 1 having a stationary end plate 1' from which an inner stationary wrap 1b projects ;an orbiting scroll 2 having an orbiting end plate 2' from which an inner orbiting wrap 2b projects, and a boss 4 in which the eccentric portion 21c is fitted; andan inner annular partition wall 101 mounted to the stationary or orbiting end plate 1',2', said inner orbiting wrap 2b being revolved by the eccentric portion 21c of the driving shaft 21 to engage with said inner stationary wrap 1a inside the inner partition wall 101 to form an expanding region, characterized in that:an expanding cover 120 that has an inward-projecting portion 123 is mounted to the orbiting end plate 2' to surround the boss 4 to form a narrower space 124 between the inward-projecting portion 123 and the boss 4, fluid from the expanding region being passed through the narrower space 124 and further depressurized or cooled.
- A scroll fluid machine as claimed in claim 1 wherein an annular support plate 121. is mounted around the boss 4 to support the expanding cover 120, the support plate 121 having an annular bore 122 through which fluid from the expanding region passes to the narrower space 124.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT04021089T ATE355444T1 (en) | 2004-09-04 | 2004-09-04 | SPIRAL FLUID MACHINE |
EP04021089A EP1632646B1 (en) | 2004-09-04 | 2004-09-04 | Scroll fluid machine |
DE602004005039T DE602004005039T2 (en) | 2004-09-04 | 2004-09-04 | Scroll fluid machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04021089A EP1632646B1 (en) | 2004-09-04 | 2004-09-04 | Scroll fluid machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1632646A1 true EP1632646A1 (en) | 2006-03-08 |
EP1632646B1 EP1632646B1 (en) | 2007-02-28 |
Family
ID=34926429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04021089A Not-in-force EP1632646B1 (en) | 2004-09-04 | 2004-09-04 | Scroll fluid machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1632646B1 (en) |
AT (1) | ATE355444T1 (en) |
DE (1) | DE602004005039T2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003307188A (en) * | 2002-04-12 | 2003-10-31 | Anest Iwata Corp | Scroll type fluid machine with compression part and expansion part |
JP2003343459A (en) * | 2002-05-28 | 2003-12-03 | Anest Iwata Corp | Scroll fluid machine and oxygen generating device |
-
2004
- 2004-09-04 AT AT04021089T patent/ATE355444T1/en not_active IP Right Cessation
- 2004-09-04 EP EP04021089A patent/EP1632646B1/en not_active Not-in-force
- 2004-09-04 DE DE602004005039T patent/DE602004005039T2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003307188A (en) * | 2002-04-12 | 2003-10-31 | Anest Iwata Corp | Scroll type fluid machine with compression part and expansion part |
JP2003343459A (en) * | 2002-05-28 | 2003-12-03 | Anest Iwata Corp | Scroll fluid machine and oxygen generating device |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05) * |
Also Published As
Publication number | Publication date |
---|---|
EP1632646B1 (en) | 2007-02-28 |
ATE355444T1 (en) | 2006-03-15 |
DE602004005039D1 (en) | 2007-04-12 |
DE602004005039T2 (en) | 2007-10-31 |
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