GB811858A - Improvements in or relating to molecular pumps - Google Patents

Improvements in or relating to molecular pumps

Info

Publication number
GB811858A
GB811858A GB3678/57A GB367857A GB811858A GB 811858 A GB811858 A GB 811858A GB 3678/57 A GB3678/57 A GB 3678/57A GB 367857 A GB367857 A GB 367857A GB 811858 A GB811858 A GB 811858A
Authority
GB
United Kingdom
Prior art keywords
discs
slots
rotation
rotor
adjacent
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
Application number
GB3678/57A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB811858A publication Critical patent/GB811858A/en
Expired legal-status Critical Current

Links

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
    • F04D19/00—Axial-flow pumps
    • F04D19/02—Multi-stage pumps
    • F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
    • F04D19/042—Turbomolecular vacuum pumps

Abstract

811,858. Screw-pumps. PFEIFFER, A., [trading as PFEIFFER, A. [Firm of]]. Feb. 1, 1957 [Feb. 2, 1956], No. 3678/57. Class 110 (1). A molecular pump comprises slotted rotor discs alternating with slotted stator discs, the slots of the rotor or the stator discs or both, having lateral bounding faces which are inclined in relation to the axis of rotation and form with the end faces of adjacent discs, wedgeshaped spaces tapering in the direction of rotation. In the vacuum pump shown, rotor discs 9 alternate with stator discs 10. A suction connection 4 is provided midway between two discharge connections 5. Slots 13 in the discs 9 are inclined oppositely to slots 15 in the discs 10. The slots co-operate with the end faces of adjacent discs to form wedgeshaped spaces 21, 23 which taper in the direction of rotation, creating a pressure rise in the spaces towards their apices. The circumferential width of the slots is such that they do not afford a free passage in a direction parallel to the axis of rotation. Preferably, the width of a slot is equal to, or slightly greater than, the width of the blank portion between adjacent slots. The slots in alternate discs may be parallel to the axis instead of being inclined, and in this case the inclined grooves of the other discs widen from the suction to the delivering sides.
GB3678/57A 1956-02-02 1957-02-01 Improvements in or relating to molecular pumps Expired GB811858A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE811858X 1956-02-02

Publications (1)

Publication Number Publication Date
GB811858A true GB811858A (en) 1959-04-15

Family

ID=6728788

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3678/57A Expired GB811858A (en) 1956-02-02 1957-02-01 Improvements in or relating to molecular pumps

Country Status (1)

Country Link
GB (1) GB811858A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2498816A (en) * 2012-01-27 2013-07-31 Edwards Ltd Vacuum pump
GB2498768B (en) * 2012-01-27 2016-07-27 Edwards Ltd Gas transfer vacuum pump

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2498816A (en) * 2012-01-27 2013-07-31 Edwards Ltd Vacuum pump
GB2498768B (en) * 2012-01-27 2016-07-27 Edwards Ltd Gas transfer vacuum pump
US10337517B2 (en) 2012-01-27 2019-07-02 Edwards Limited Gas transfer vacuum pump

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