EP1267082B1 - Lubricating system for regenerative vacuum pumps - Google Patents
Lubricating system for regenerative vacuum pumps Download PDFInfo
- Publication number
- EP1267082B1 EP1267082B1 EP02253949A EP02253949A EP1267082B1 EP 1267082 B1 EP1267082 B1 EP 1267082B1 EP 02253949 A EP02253949 A EP 02253949A EP 02253949 A EP02253949 A EP 02253949A EP 1267082 B1 EP1267082 B1 EP 1267082B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- axial bore
- shaft
- bearings
- lubricating
- radial holes
- 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.)
- Revoked
Links
- 230000001050 lubricating effect Effects 0.000 title claims abstract description 23
- 230000001172 regenerating effect Effects 0.000 title claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 14
- 238000005461 lubrication Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 235000003642 hunger Nutrition 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/06—Lubrication
- F04D29/063—Lubrication specially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
- F04D17/168—Pumps specially adapted to produce a vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D23/00—Other rotary non-positive-displacement pumps
- F04D23/008—Regenerative pumps
Definitions
- This invention relates to vacuum pumps of the regenerative type or which incorporate a regenerative section and which incorporate a high speed rotatable vertical shaft supported by bearings at each end of the shaft, and in particular to lubricating systems for such bearings.
- a rotor In vacuum pumps of the regenerative type, a rotor is mounted on a vertical shaft for rotation within a surrounding stator.
- the shaft is supported by upper and lower bearings which require lubrication.
- the shaft is provided with a central axial bore which communicates with radial holes in alignment with the upper and lower bearings for delivering a lubricating fluid to the bearings.
- GB-A-923779 specifies a compressor with a rotary shaft having a conical extension extending into a shaft reservoir with lubricating oil, the said conical extension comprising a side hole for allowing the dissipation of gas or vapour separating from the oil and accumulating inside the pipe.
- a vacuum pump is provided as specified in claim 1.
- FIG. 1 illustrates a known compound vacuum pump comprising a regenerative section 1 and a molecular drag (Holweck) section 2.
- the pump includes a casing 3 made from a number of different body parts bolted or otherwise fixed together and provided with relevant seals therebetween.
- a vertical shaft 6 mounted within the casing 3 is a vertical shaft 6 supported by an upper bearing 4 and a lower bearing 5.
- the shaft 6 is rotatable about its longitudinal axis and is driven by an electric motor 7 surrounding the shaft 6.
- a rotor 9 Securely attached to the shaft for rotation therewith is a rotor 9.
- An axial bore 8 extends along a substantial length of the shaft and communicates with radial oil holes 8' delivering lubricating fluid to the upper and lower bearings.
- a lubricating fluid such as oil establishes its own taper in a straight axial bore providing a small ledge is available at the bottom (as shown) end of the axial bore.
- the lower radial holes 12 in alignment with the lower bearing are formed in a tapered surface of the axial bore. This mechanical taper means that the lubricating fluid will continue to flow both out from the lower radial holes 12 and also past the holes 12 to the upper radial holes 14 to the upper bearings.
- the ratio of lubricating fluid leaving the respective holes 12, 14 is dependent upon oil jet hole diameter, taper angle, hole height within the taper and taper diameter.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Non-Positive Displacement Air Blowers (AREA)
- Compressor (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
Description
- This invention relates to vacuum pumps of the regenerative type or which incorporate a regenerative section and which incorporate a high speed rotatable vertical shaft supported by bearings at each end of the shaft, and in particular to lubricating systems for such bearings.
- In vacuum pumps of the regenerative type, a rotor is mounted on a vertical shaft for rotation within a surrounding stator. The shaft is supported by upper and lower bearings which require lubrication. To facilitate lubrication of the bearings the shaft is provided with a central axial bore which communicates with radial holes in alignment with the upper and lower bearings for delivering a lubricating fluid to the bearings.
- It is known to utilise centrifugal force generated by the rotating shaft to draw the lubricating fluid from a reservoir up the axial bore in the form of a thin film to reach the radial holes in alignment with initially the lower bearing and finally the upper bearing. The lubricating fluid establishes its own taper in a straight axial bore provided that a small ledge is available at the lower end of the axial bore. In known lubricating systems the radial holes in alignment with the lower bearing terminate the taper and thus prevent further flow up the axial bore thereby starving the upper bearing of lubrication.
- It is an aim of this invention to obviate this disadvantage.
- GB-A-923779 specifies a compressor with a rotary shaft having a conical extension extending into a shaft reservoir with lubricating oil, the said conical extension comprising a side hole for allowing the dissipation of gas or vapour separating from the oil and accumulating inside the pipe.
- According to the present invention, a vacuum pump is provided as specified in claim 1.
- An embodiment of the invention will now be described, by way of example, reference being made to the Figures of the accompanying diagrammatic drawings in which:
- Figure 1 is a cross section through a known compound vacuum pump including a regenerative section;
- Figure 2 is a detail of a known lubricating system illustrating how lubricating fluid establishes its own taper in a straight axial bore;
- Figure 3 is a detail similar to Figure 2 but illustrating how in the known art excessive lubricating fluid can be delivered to the lower bearing whilst insufficient lubricating fluid is delivered to the upper bearing; and
- Figure 4 is a detail similar to Figures 2 and 3 but illustrating the lubricating system according to the present invention.
- Referring first to Figure 1, which illustrates a known compound vacuum pump comprising a regenerative section 1 and a molecular drag (Holweck)
section 2. The pump includes acasing 3 made from a number of different body parts bolted or otherwise fixed together and provided with relevant seals therebetween. - Mounted within the
casing 3 is avertical shaft 6 supported by an upper bearing 4 and alower bearing 5. Theshaft 6 is rotatable about its longitudinal axis and is driven by anelectric motor 7 surrounding theshaft 6. Securely attached to the shaft for rotation therewith is arotor 9. Anaxial bore 8 extends along a substantial length of the shaft and communicates with radial oil holes 8' delivering lubricating fluid to the upper and lower bearings. - Referring now to Figure 2, it is known that a lubricating fluid such as oil establishes its own taper in a straight axial bore providing a small ledge is available at the bottom (as shown) end of the axial bore.
- Referring now to Figure 3, it is known to provide two sets of
radial holes axial bore 18 of arotatable shaft 16 and respective upper and lower bearings (not shown). When theshaft 16 rotates, centrifugal force will force lubricating fluid from a reservoir through an open lower end of theshaft 16 and along the inside surface of the axial bore in the form of a thin film. However, the lowerradial holes 12 effectively finalise the taper of the lubricating fluid film and prevent further flow of the film up the axial bore thereby starving the upper bearing of lubrication. - According to the present invention and with reference to Figure 4 the lower
radial holes 12 in alignment with the lower bearing are formed in a tapered surface of the axial bore. This mechanical taper means that the lubricating fluid will continue to flow both out from the lowerradial holes 12 and also past theholes 12 to the upperradial holes 14 to the upper bearings. - The ratio of lubricating fluid leaving the
respective holes
Claims (1)
- A vacuum pump of the regenerative type or including a regenerative section comprising a rotatable substantially vertical shaft (6) supported by upper and lower bearings (4,5), a lubricating system for lubricating the bearings comprising an axial bore (8,18) extending along the shaft (6) and in communication with radial holes (8,'12,14) aligned respectively with the lower bearing (5) and the upper bearing (4), the lower open end of the axial bore extending in to a shaft reservoir containing lubricating fluid, characterized in that the radial holes (8, 12) in alignment with the lower bearing (5) are formed in a tapered surface of the axial bore (8, 18).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0114397 | 2001-06-13 | ||
GBGB0114397.3A GB0114397D0 (en) | 2001-06-13 | 2001-06-13 | Improved lubricating systems for regenerative vacuum pumps |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1267082A2 EP1267082A2 (en) | 2002-12-18 |
EP1267082A3 EP1267082A3 (en) | 2003-10-15 |
EP1267082B1 true EP1267082B1 (en) | 2006-10-18 |
Family
ID=9916491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02253949A Revoked EP1267082B1 (en) | 2001-06-13 | 2002-06-06 | Lubricating system for regenerative vacuum pumps |
Country Status (6)
Country | Link |
---|---|
US (2) | US20030000772A1 (en) |
EP (1) | EP1267082B1 (en) |
JP (1) | JP2003042091A (en) |
AT (1) | ATE343067T1 (en) |
DE (1) | DE60215418T2 (en) |
GB (1) | GB0114397D0 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7546782B2 (en) * | 2006-01-12 | 2009-06-16 | Seakeeper, Inc. | Cooling bearings, motors and other rotating heat generating components |
CN102057137B (en) * | 2008-07-03 | 2015-08-19 | 迪尔公司 | Lubricating oil circulation distributed controll between coaxial rotating axle |
DE102013207269A1 (en) * | 2013-04-22 | 2014-10-23 | Pfeiffer Vacuum Gmbh | Stator element for a Holweckpumpstufe, vacuum pump with a Holweckpumpstufe and method for producing a stator element for a Holweckpumpstufe |
JP7292881B2 (en) * | 2019-01-10 | 2023-06-19 | エドワーズ株式会社 | Vacuum pump |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB923779A (en) * | 1962-01-25 | 1963-04-18 | Licentia Gmbh | Improvements in lubricating arrangements for compressors |
DE2119857A1 (en) * | 1971-04-23 | 1972-11-02 | Leybold-Heraeus GmbH & Co KG, 5000 Köln | Device for supplying oil to bearings |
JPS5776201A (en) * | 1980-10-31 | 1982-05-13 | Hitachi Ltd | Oil feed device for scroll hydraulic machine |
US4432693A (en) * | 1982-02-18 | 1984-02-21 | The Trane Company | Centrifugal pump impeller |
US4565503A (en) * | 1982-10-12 | 1986-01-21 | Tecumseh Products Company | Device for cooling motor end-turns in a compressor |
US4724928A (en) * | 1986-04-14 | 1988-02-16 | Carrier Corporation | Single stage oil pump lubrication system |
DE3865634D1 (en) * | 1987-11-12 | 1991-11-21 | Leybold Ag | OIL SUPPLY DEVICE. |
US4877381A (en) * | 1988-05-12 | 1989-10-31 | Tecumseh Products Company | Compressor shaft collar through port for pressure equalization between fluid pockets |
US5842420A (en) * | 1992-09-07 | 1998-12-01 | Khoo; Chew Thong | Crankshaft lubrication system |
BR9300797A (en) * | 1993-03-02 | 1994-10-04 | Brasil Compressores Sa | Oil pump for hermetic variable speed compressor |
US5885066A (en) * | 1997-02-26 | 1999-03-23 | Matsushita Electric Industrial Co., Ltd. | Scroll compressor having oil bores formed through the crank shaft |
US6527085B1 (en) * | 2000-11-14 | 2003-03-04 | Tecumseh Products Company | Lubricating system for compressor |
US6375444B1 (en) * | 2001-02-14 | 2002-04-23 | Scroll Technologies | Axial pressure seal lubricator |
-
2001
- 2001-06-13 GB GBGB0114397.3A patent/GB0114397D0/en not_active Ceased
-
2002
- 2002-06-06 EP EP02253949A patent/EP1267082B1/en not_active Revoked
- 2002-06-06 DE DE60215418T patent/DE60215418T2/en not_active Expired - Lifetime
- 2002-06-06 AT AT02253949T patent/ATE343067T1/en not_active IP Right Cessation
- 2002-06-07 US US10/164,795 patent/US20030000772A1/en not_active Abandoned
- 2002-06-13 JP JP2002172444A patent/JP2003042091A/en active Pending
-
2005
- 2005-06-08 US US11/147,577 patent/US20050271528A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
EP1267082A3 (en) | 2003-10-15 |
GB0114397D0 (en) | 2001-08-08 |
DE60215418D1 (en) | 2006-11-30 |
JP2003042091A (en) | 2003-02-13 |
EP1267082A2 (en) | 2002-12-18 |
ATE343067T1 (en) | 2006-11-15 |
DE60215418T2 (en) | 2007-08-30 |
US20050271528A1 (en) | 2005-12-08 |
US20030000772A1 (en) | 2003-01-02 |
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