GB1248032A - Rotary mechanical vacuum pumps of the intermeshing screw type - Google Patents
Rotary mechanical vacuum pumps of the intermeshing screw typeInfo
- 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
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.
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)
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 |
-
1967
- 1967-09-21 GB GB4461168A patent/GB1248032A/en not_active Expired
Cited By (13)
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 |
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