GB1248032A - Rotary mechanical vacuum pumps of the intermeshing screw type - Google Patents

Rotary mechanical vacuum pumps of the intermeshing screw type

Info

Publication number
GB1248032A
GB1248032A GB4461168A GB4461168A GB1248032A GB 1248032 A GB1248032 A GB 1248032A GB 4461168 A GB4461168 A GB 4461168A GB 4461168 A GB4461168 A GB 4461168A GB 1248032 A GB1248032 A GB 1248032A
Authority
GB
United Kingdom
Prior art keywords
pump
rotors
housing
bores
oil
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
GB4461168A
Inventor
Henryk Wycliffe
Basil Dixon Power
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 International Ltd
Original Assignee
Edwards High Vacuum International 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 Edwards High Vacuum International Ltd filed Critical Edwards High Vacuum International Ltd
Priority to GB4461168A priority Critical patent/GB1248032A/en
Publication of GB1248032A publication Critical patent/GB1248032A/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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • 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
    • F04C23/001—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 of similar working principle

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

1,248,032. Rotary vacuum pumps. EDWARDS HIGH VACUUM INTERNATIONAL Ltd. Sept.21, 1967 [Sept.21, 1967], No.44611/68. Divided out of 1,248,032. Heading F1F. A rotary vacuum pump comprises a pair of intermeshing screw type rotors 4, 5, Fig.1, mounted in overlapping bores on parallel shafts 10, 10<SP>1</SP> within a housing 1 connected by a flange 2 to a space to be evacuated and by an outlet 3 to an oil-sealed backing pump (not shown). The shafts 10, 10<SP>1</SP> are fixed at their lower ends to the housing and extend as cantilevers into rotor bores which are closed at their high vacuum ends 6, 7 to isolate the oil lubricating the bearings from the said space. The pump which operates "dry" includes a running clearance of the order of À005" between the rotors and the housing bores and synchronizing gears 4a, 5a. The pump may operate as the backing pump in which case, except for a film of oil the rotors are a close fit in the housing bores and the synchronizing gears 11, 12 are omitted. The pump then having rotors 4<SP>11</SP>, 5<SP>11</SP>, Fig. 4 is mounted in a single housing in series with a high vacuum pump having rotors 4, 5 rotatably mounted on cantilever extensions of the shafts 10, 10<SP>1</SP>. Oil lubricating the bearings is sealed from entering the high vacuum pump, the rotors 4, 5 of which rotate with clearance between them and the housing bores. The low vacuum backing pump is fitted with a flap valve or valves at its discharge end. Two "dry" pumps may be mounted in parallel in a single housing with a common discharge connected to an oil-sealed backing pump.
GB4461168A 1967-09-21 1967-09-21 Rotary mechanical vacuum pumps of the intermeshing screw type Expired GB1248032A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4461168A GB1248032A (en) 1967-09-21 1967-09-21 Rotary mechanical vacuum pumps of the intermeshing screw type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4461168A GB1248032A (en) 1967-09-21 1967-09-21 Rotary mechanical vacuum pumps of the intermeshing screw type

Publications (1)

Publication Number Publication Date
GB1248032A true GB1248032A (en) 1971-09-29

Family

ID=10434071

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4461168A Expired GB1248032A (en) 1967-09-21 1967-09-21 Rotary mechanical vacuum pumps of the intermeshing screw type

Country Status (1)

Country Link
GB (1) GB1248032A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495701A1 (en) * 1980-12-05 1982-06-11 Boc Ltd MECHANICAL PUMP, IN PARTICULAR FOR OBTAINING A PUSHED VACUUM
FR2517755A1 (en) * 1981-12-09 1983-06-10 Boc Group Plc PERFECTED MECHANICAL PUMP WITH PUSHED VACUUM
EP0290662A1 (en) * 1987-05-15 1988-11-17 Leybold Aktiengesellschaft Positive-displacement two-shaft vacuum pump
EP0585911A1 (en) * 1992-09-03 1994-03-09 Matsushita Electric Industrial Co., Ltd. Two stage primary dry pump
US9068643B2 (en) 2012-11-14 2015-06-30 Caterpillar Inc. Efficiency spur gear set housing
CN114526233A (en) * 2022-03-02 2022-05-24 安徽理工大学 Composite dry vacuum pump with roots rotor and screw rotor connected in series and use method

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2495701A1 (en) * 1980-12-05 1982-06-11 Boc Ltd MECHANICAL PUMP, IN PARTICULAR FOR OBTAINING A PUSHED VACUUM
DE3147824A1 (en) * 1980-12-05 1982-06-24 Boc Ltd., London "MECHANICAL PUMP"
FR2517755A1 (en) * 1981-12-09 1983-06-10 Boc Group Plc PERFECTED MECHANICAL PUMP WITH PUSHED VACUUM
EP0290662A1 (en) * 1987-05-15 1988-11-17 Leybold Aktiengesellschaft Positive-displacement two-shaft vacuum pump
US4940398A (en) * 1987-05-15 1990-07-10 Leybold Aktiengesellschaft Twin-shaft, multiple-stage vacuum pump with the shafts vertically disposed
EP0409287A1 (en) * 1987-05-15 1991-01-23 Leybold Aktiengesellschaft Vacuum pump with displacement space
EP0585911A1 (en) * 1992-09-03 1994-03-09 Matsushita Electric Industrial Co., Ltd. Two stage primary dry pump
US5564907A (en) * 1992-09-03 1996-10-15 Matsushita Electric Industrial Co., Ltd. Evacuating apparatus
US5709537A (en) * 1992-09-03 1998-01-20 Matsushita Electric Industrial Co., Ltd. Evacuating apparatus
US5951266A (en) * 1992-09-03 1999-09-14 Matsushita Electric Industrial Co., Ltd. Evacuating apparatus having interengaging rotors with threads having a decreasing pitch at the exhaust side
US9068643B2 (en) 2012-11-14 2015-06-30 Caterpillar Inc. Efficiency spur gear set housing
CN114526233A (en) * 2022-03-02 2022-05-24 安徽理工大学 Composite dry vacuum pump with roots rotor and screw rotor connected in series and use method
CN114526233B (en) * 2022-03-02 2024-05-10 安徽理工大学 Composite dry vacuum pump with Roots rotor and screw rotor connected in series and use method

Similar Documents

Publication Publication Date Title
US2578196A (en) Screw compressor
GB1248031A (en) Two-stage rotary vacuum pumps
KR980003031A (en) Volumetric vacuum pump
US2824687A (en) Rotary compressor
GB1218130A (en) Rotary positive-displace ment gas compressor
GB851262A (en) Improvements in rotary devices having intermeshing screw rotors
GB1248032A (en) Rotary mechanical vacuum pumps of the intermeshing screw type
SE319197B (en)
JPS643295A (en) Vane type compressor
GB1454014A (en) Rotary sliding vane pump
GB1003961A (en) Improvements in two stage screw rotor machines
GB1305267A (en)
US1708891A (en) Rotary engine for compressible or expansive mediums
GB1510962A (en) Vacuum pumps
GB1388368A (en) Displacement machine such as a pump
GB978475A (en) Rotary vacuum pumps
GB746628A (en) Improvements in pumps or motors of the meshing screw type
GB1255971A (en) Improvements in or relating to intermeshing screw compressors
GB1522246A (en) Lubrication of relatively-movable parts of vacuum pumps
GB1016325A (en) Improvements in or relating to rotary vacuum pumps
JPS5546011A (en) Oil cooled screw compressor with regulating valve
GB1372865A (en) Oscillating vane compressor
CN210050032U (en) Oil-free screw structure
GB874045A (en) Improvements in or relating to rotary engines or compressors
GB752437A (en) Improvements in rotary engines and pumps