EP1207307A1 - Screw compressor - Google Patents
Screw compressor Download PDFInfo
- Publication number
- EP1207307A1 EP1207307A1 EP01127272A EP01127272A EP1207307A1 EP 1207307 A1 EP1207307 A1 EP 1207307A1 EP 01127272 A EP01127272 A EP 01127272A EP 01127272 A EP01127272 A EP 01127272A EP 1207307 A1 EP1207307 A1 EP 1207307A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- output shaft
- compressor
- electric motor
- rotor
- rotors
- 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- Withdrawn
Links
Images
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
Definitions
- the present invention relates to a screw compressor.
- the present invention relates to a screw compressor of the type comprising an electric motor with a first output shaft; two intermeshing rotors, one of which has a second output shaft substantially coaxial with and facing the first shaft; and connecting means for connecting the first and second shaft in angularly fixed manner.
- said connecting means comprise an elastic joint, in turn comprising two half-joints interference-fitted respectively to the first and second shaft; and a rubber ring interposed between the two half-joints.
- the compressor also comprises two bearings between the rotors and the electric motor, for respectively supporting the first and second shaft in rotary manner. More specifically, the bearing supporting the first shaft is housed inside a tubular housing interposed between a first tubular casing housing the two rotors, and a second tubular casing housing the electric motor.
- the two half-joints must be expanded thermally to engage the first and second shaft in axially sliding manner, so that fitting and removing the half-joints to and from the shafts are relatively painstaking jobs.
- a screw compressor comprising an electric motor having a given longitudinal axis; and two intermeshing rotors, a first of said rotors being substantially coaxial with said longitudinal axis; characterized by also comprising a single output shaft defining the output shaft of both said electric motor and said first rotor.
- Number 1 in the accompanying drawing indicates as a whole a screw compressor comprising an electric motor 2 having a tubular outer casing 3, which has a substantially horizontal longitudinal axis 4 and houses a rotor 5 fitted to an output shaft 6 substantially coaxial with axis 4.
- shaft 6 is mounted to rotate about axis 4 with respect to casing 3 and via the interposition of rolling bearings 7.
- Compressor 1 also comprises a tubular outer casing 8 connected directly to casing 3 and housing two rotors 9, 10, which are rotated by motor 2 with respect to casing 8, one about axis 4, and the other about an axis 11 substantially parallel to axis 4.
- Each rotor 9, 10 comprises a central portion 12, 13, which is coaxial with respective axis 4, 11, has a symmetrically helical outer contour, and meshes with portion 13, 12 of the other rotor 10, 9 to compress a fluid inside casing 8 as the two rotors 9, 10 are counter-rotated by motor 2.
- portion 12 is fitted through with shaft 6, and is connected in angularly fixed manner to shaft 6, which therefore comprises a central portion 14 located between rotors 5 and 9 and supported in rotary manner by a single- rolling bearing 7, and a lateral portion 15 located at the opposite end of portion 12 to portion 14.
- portion 12 of rotor 9 is formed in one piece with shaft 6, and rotor 5 of electric motor 2 is fitted to shaft 6.
- Rotor 10 comprises two shanks 16, which are preferably, though not necessarily, formed in one piece with portion 13, are located at opposite ends of portion 13, and are coaxial with axis 11.
- shanks 16 define the end portions of a relative output shaft to which portion 13 is fitted.
- shaft 6 may define the output shaft of motor 2 and of rotor 10.
Abstract
A screw compressor has an electric motor (2) having
a given longitudinal axis (4), and two intermeshing
rotors (9, 10); the electric motor (2) having an output
shaft (6) also defining the output shaft of that (9) of
the two rotors (9, 10) which is coaxial to the
longitudinal axis (4) of the electric motor (2).
Description
- The present invention relates to a screw compressor.
- More specifically, the present invention relates to a screw compressor of the type comprising an electric motor with a first output shaft; two intermeshing rotors, one of which has a second output shaft substantially coaxial with and facing the first shaft; and connecting means for connecting the first and second shaft in angularly fixed manner.
- Normally, said connecting means comprise an elastic joint, in turn comprising two half-joints interference-fitted respectively to the first and second shaft; and a rubber ring interposed between the two half-joints.
- The compressor also comprises two bearings between the rotors and the electric motor, for respectively supporting the first and second shaft in rotary manner. More specifically, the bearing supporting the first shaft is housed inside a tubular housing interposed between a first tubular casing housing the two rotors, and a second tubular casing housing the electric motor.
- As a result, known screw compressors of the above type are relatively long, and are fairly expensive owing to the presence of the elastic joint, the two bearings supporting the first and second shaft, and the tubular housing.
- Moreover, the two half-joints must be expanded thermally to engage the first and second shaft in axially sliding manner, so that fitting and removing the half-joints to and from the shafts are relatively painstaking jobs.
- It is an object of the present invention to provide a screw compressor designed to eliminate the aforementioned drawbacks.
- According to the present invention, there is provided a screw compressor comprising an electric motor having a given longitudinal axis; and two intermeshing rotors, a first of said rotors being substantially coaxial with said longitudinal axis; characterized by also comprising a single output shaft defining the output shaft of both said electric motor and said first rotor.
- A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawing showing an axial section.
- Number 1 in the accompanying drawing indicates as a whole a screw compressor comprising an
electric motor 2 having a tubularouter casing 3, which has a substantially horizontal longitudinal axis 4 and houses arotor 5 fitted to anoutput shaft 6 substantially coaxial with axis 4. - More specifically,
shaft 6 is mounted to rotate about axis 4 with respect tocasing 3 and via the interposition ofrolling bearings 7. - Compressor 1 also comprises a tubular
outer casing 8 connected directly tocasing 3 and housing tworotors motor 2 with respect tocasing 8, one about axis 4, and the other about anaxis 11 substantially parallel to axis 4. - Each
rotor central portion respective axis 4, 11, has a symmetrically helical outer contour, and meshes withportion other rotor casing 8 as the tworotors motor 2. - With reference to the accompanying drawing,
portion 12 is fitted through withshaft 6, and is connected in angularly fixed manner toshaft 6, which therefore comprises acentral portion 14 located betweenrotors bearing 7, and alateral portion 15 located at the opposite end ofportion 12 toportion 14. - In a variation not shown,
portion 12 ofrotor 9 is formed in one piece withshaft 6, androtor 5 ofelectric motor 2 is fitted toshaft 6. -
Rotor 10 comprises twoshanks 16, which are preferably, though not necessarily, formed in one piece withportion 13, are located at opposite ends ofportion 13, and are coaxial withaxis 11. - In a variation not shown,
shanks 16 define the end portions of a relative output shaft to whichportion 13 is fitted. - In a further variation not shown,
shaft 6 may define the output shaft ofmotor 2 and ofrotor 10. - Operation of compressor 1 is easily deducible from the foregoing description with no further explanation required.
- The fact that a
single shaft 6 defines the output shaft of bothelectric motor 2 androtor 9 has several advantages, the main ones of which derive from the fact that: - the length of compressor 1, measured parallel to axis 4, is relatively short;
-
central portion 14 ofshaft 6 can be supported in rotary manner by a single rollingbearing 7; - compressor 1 is relatively easy to assemble and disassemble;
-
rotors - if compressor 1 is positioned with axis 4 vertical
and with
motor 2 beneathrotors bearing 7 supporting the portion ofshaft 6 extending abovemotor 2 can also be eliminated. -
Claims (5)
- A screw compressor comprising an electric motor (2) having a given longitudinal axis (4); and two intermeshing rotors (9, 10), a first (9) of said rotors (9, 10) being substantially coaxial with said longitudinal axis (4); characterized by also comprising a single output shaft (6) defining the output shaft of both said electric motor (2) and said first rotor (9).
- A compressor as claimed in Claim 1, wherein said output shaft (6) is formed in one piece with said first rotor (9).
- A compressor as claimed in Claim 1, wherein said first rotor (9) is connected in angularly fixed manner to said output shaft (6).
- A compressor as claimed in any one of the foregoing Claims, wherein said output shaft (6) comprises a central portion (14) located between said electric motor (2) and said first rotor (9); a single bearing (7) supporting said output shaft (6) in rotary manner at said central portion (14).
- A compressor as claimed in any one of the foregoing Claims, wherein said electric motor (2) comprises a first tubular outer casing (3); the compressor also comprising a second tubular outer casing (8) housing said rotors (9, 10) and connected directly to said first tubular outer casing (3).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO000669 | 2000-11-17 | ||
IT2000BO000669A ITBO20000669A1 (en) | 2000-11-17 | 2000-11-17 | SCREW COMPRESSOR |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1207307A1 true EP1207307A1 (en) | 2002-05-22 |
Family
ID=11438859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01127272A Withdrawn EP1207307A1 (en) | 2000-11-17 | 2001-11-16 | Screw compressor |
Country Status (3)
Country | Link |
---|---|
US (1) | US20020081227A1 (en) |
EP (1) | EP1207307A1 (en) |
IT (1) | ITBO20000669A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7573165B2 (en) | 2000-12-21 | 2009-08-11 | Ingersoll-Rand European Sales Limited | Compressor and driving motor assembly |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008121479A (en) * | 2006-11-10 | 2008-05-29 | Hitachi Appliances Inc | Hermetic screw compressor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3796526A (en) * | 1972-02-22 | 1974-03-12 | Lennox Ind Inc | Screw compressor |
US4311440A (en) * | 1977-01-05 | 1982-01-19 | Hale Fire Pump Company | Pump |
US5222874A (en) * | 1991-01-09 | 1993-06-29 | Sullair Corporation | Lubricant cooled electric drive motor for a compressor |
DE19745616A1 (en) * | 1997-10-10 | 1999-04-15 | Leybold Vakuum Gmbh | Cooling system for helical vacuum pump |
-
2000
- 2000-11-17 IT IT2000BO000669A patent/ITBO20000669A1/en unknown
-
2001
- 2001-11-16 US US09/993,418 patent/US20020081227A1/en not_active Abandoned
- 2001-11-16 EP EP01127272A patent/EP1207307A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3796526A (en) * | 1972-02-22 | 1974-03-12 | Lennox Ind Inc | Screw compressor |
US4311440A (en) * | 1977-01-05 | 1982-01-19 | Hale Fire Pump Company | Pump |
US5222874A (en) * | 1991-01-09 | 1993-06-29 | Sullair Corporation | Lubricant cooled electric drive motor for a compressor |
DE19745616A1 (en) * | 1997-10-10 | 1999-04-15 | Leybold Vakuum Gmbh | Cooling system for helical vacuum pump |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7573165B2 (en) | 2000-12-21 | 2009-08-11 | Ingersoll-Rand European Sales Limited | Compressor and driving motor assembly |
Also Published As
Publication number | Publication date |
---|---|
ITBO20000669A1 (en) | 2002-05-17 |
ITBO20000669A0 (en) | 2000-11-17 |
US20020081227A1 (en) | 2002-06-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
AKX | Designation fees paid | ||
REG | Reference to a national code |
Ref country code: DE Ref legal event code: 8566 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20030723 |