GB680001A - Improvements in or relating to the production of vacua - Google Patents

Improvements in or relating to the production of vacua

Info

Publication number
GB680001A
GB680001A GB2650548A GB2650548A GB680001A GB 680001 A GB680001 A GB 680001A GB 2650548 A GB2650548 A GB 2650548A GB 2650548 A GB2650548 A GB 2650548A GB 680001 A GB680001 A GB 680001A
Authority
GB
United Kingdom
Prior art keywords
pump
oct
pressure
large volume
line
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
GB2650548A
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.)
Edwards High Vacuum Ltd
Original Assignee
W Edwards and Company London Ltd
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 W Edwards and Company London Ltd filed Critical W Edwards and Company London Ltd
Priority to GB2650548A priority Critical patent/GB680001A/en
Publication of GB680001A publication Critical patent/GB680001A/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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • 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
    • F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C27/009—Shaft sealings specially adapted for pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F9/00—Diffusion pumps
    • F04F9/04—Diffusion pumps in combination with fore pumps, e.g. use of isolating valves

Abstract

680,001. Vacuum pumps. EDWARDS & CO. (LONDON), Ltd., W., and BARRETT, A. S. D. Oct. 12, 1949 [Oct. 12. 1948], No. 26505/48. Classes 110 (i) and 110 (ii) [Also in Group XXVIII] A method of obtaining a high vacuum in a container consists in employing a large volume displacement mechanical pump 2 capable of a minimum displacement of 100 cu. ft./min. and operating at high speed without rubbing contact, together with a mechanical backing pump 1 or an ejector. The large volume displacement pump 2 may be a Northey compressor, a Rootes blower or a centrifugal blower or piston and cylinder pump and the pump 1 a rotary pump. The pump 2 may be immersed in a tank containing a low vapour pressure liquid which may be maintained at sub-atmospheric pressure e.g. by connecting it to the pump 1. The pump 2 may be sealed by a film of sealing liquid. A pressure relief valve 5 may be inserted in the line between the pumps 1, 2 and the line may have a cooled trap 25 and a pressure responsive switch 26 to switch off the motor driving pump 1. Pump shaft seals on the pump 2 may be connected to the pump 1 to prevent ingress of lubricant to pump 2. The system may be used to back a vapour steam pump.
GB2650548A 1948-10-12 1948-10-12 Improvements in or relating to the production of vacua Expired GB680001A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2650548A GB680001A (en) 1948-10-12 1948-10-12 Improvements in or relating to the production of vacua

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2650548A GB680001A (en) 1948-10-12 1948-10-12 Improvements in or relating to the production of vacua

Publications (1)

Publication Number Publication Date
GB680001A true GB680001A (en) 1952-10-01

Family

ID=10244719

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2650548A Expired GB680001A (en) 1948-10-12 1948-10-12 Improvements in or relating to the production of vacua

Country Status (1)

Country Link
GB (1) GB680001A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068856B (en) * 1959-11-12
US2958455A (en) * 1956-11-02 1960-11-01 Nat Res Corp High vacuum
US2983432A (en) * 1956-09-19 1961-05-09 Gen Electric Vacuum cleaner with improved fan arrangement
US4465442A (en) * 1980-12-18 1984-08-14 Arthur Pfeiffer Vakuumtechnik Wetzlar Gmbh Rotary piston pump with pressure equalization chambers for the shaft split seals
DE3514317A1 (en) * 1984-04-20 1985-10-31 Tokico Ltd., Kawasaki, Kanagawa VACUUM PUMP
EP0874158A1 (en) * 1997-04-25 1998-10-28 The BOC Group plc Vacuum pump with shaft seal

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068856B (en) * 1959-11-12
US2983432A (en) * 1956-09-19 1961-05-09 Gen Electric Vacuum cleaner with improved fan arrangement
US2958455A (en) * 1956-11-02 1960-11-01 Nat Res Corp High vacuum
US4465442A (en) * 1980-12-18 1984-08-14 Arthur Pfeiffer Vakuumtechnik Wetzlar Gmbh Rotary piston pump with pressure equalization chambers for the shaft split seals
DE3514317A1 (en) * 1984-04-20 1985-10-31 Tokico Ltd., Kawasaki, Kanagawa VACUUM PUMP
EP0874158A1 (en) * 1997-04-25 1998-10-28 The BOC Group plc Vacuum pump with shaft seal
US6244841B1 (en) * 1997-04-25 2001-06-12 The Boc-Group, Plc Vacuum pumps

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