IL40902A - Low-temperature pumping device - Google Patents
Low-temperature pumping deviceInfo
- Publication number
- IL40902A IL40902A IL40902A IL4090272A IL40902A IL 40902 A IL40902 A IL 40902A IL 40902 A IL40902 A IL 40902A IL 4090272 A IL4090272 A IL 4090272A IL 40902 A IL40902 A IL 40902A
- Authority
- IL
- Israel
- Prior art keywords
- low
- temperature
- gas
- pumping device
- pumping
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D8/00—Cold traps; Cold baffles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/06—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for evacuating by thermal means
- F04B37/08—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for evacuating by thermal means by condensing or freezing, e.g. cryogenic pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Claims (19)
1. In a low-temperature pumping device comprising: a pumping chamber, gas-introduction means opening into said pumping chamber, a main pumping body located within said pumping chamber at a distance from the wall of said pumping chamber, and having a main low-temperature pumping surface, main cooling means for cooling said main pumping body to said low temperature, a gas-permeable heat screen at a cold temperature, disposed within said pumping chamber at a distance from said main pumping body, and facing said main pumping surface, the improvement wherein there are further provided: auxiliary trapping means arranged between said gas- introduction means and said heat screen, said auxiliary trapping means having an auxiliary low-temperature pumping surface, auxiliary cooling means for cooling said auxiliary trapping means, control means for variably operating said auxiliary trapping means in relation with said gas-^introduction means.
2. A low-temperature pumping device in accordance with Claim 1, wherein said auxiliary trapping means comprise a movable shutter, and said control means are intended to control in position said movable shutter across said gas-introduction means*
3. A low-temperature pumping device in accordance with Claim 2, wherein said auxiliary cooling means comprise a tank disposed within said pumping chamber, intended to receive a fluid at a moderately cold temperature , such as liquid nitrogen, and a thermal contact member between said tank and said auxiliary trapping means.
4. A low-temperature pumping device in accordance with Claim 2, wherei said control means comprise: a sleeve connected fluid-tightly to ultra-vacuum to the wall of said pumping chamber, a bellows extending inside said pumping chamber, connected at one end to said sleeve, and at the other end to an end-piece, a rod extending outside said bellows and inside said pumping chamber, connecting said end-piece and said auxiliary trapping means, another rod extending inside said bellows and outside said pumping chamber, connecting said end piece and actuating means located outside said pumping chamber.
5. A low-temperature pumping device according to Claim 4, wherei said actuating means ar mechanically operated.
6. » A low-temperature pumping device according to Claim 4, wherein said actuating means are magnetically operated.
7. A low-tempe ature pumping device according to Claim 5, wherei said actuating means comprise a knurled screw threaded o said another rod, and a bearing for said knurled screw.
8. A low-temperature pumping device according to Claim 1, wherein said auxiliary trapping means comprise a trap arranged between said gas-introduction means and said heat screen, said auxiliary cooling means comprise supplying means for flowing a very cold fluid/ thermally connected to said trap, and said control means comprise a alv^ for regulating the flow-rate of said very cold fluid.
9. A low-temperature pumping device according to Claim 8, wherein said trap has an annular form substantially coaxial with said gas-introduction means, and has substantially the same transverse dimension as the one of said gas-introduct on means.
10. A low- emperature pumping device in accordance with Claim 8, wherein said mai pumping body comprises a main tank for said very cold fluid, such as liquid helium, and said main cooling means comprise feeding means of said main tank with said very cold fluid, and wherein said supplying means are connected to said main tank and to an evacuation pipe for evacuating said vaporized very cold fluid.
11. A low-temperature pumping device in accordance with Claim 10, wherein said main tank is provided with pressurizing means.
12. A low-temperature pumping device in accordance with Claim 11, wherein said pressurizing means comprise an electric heating resistance located in said main tank.
13. A low-temperature pumping device in accordance with Claim 10, wherei said supplying means are connected to an upper level of said main tank.
14. A low-temperature pumping device in accordance with Claim 10, wherein said supplying means are connected to a lower level of said main tank.
15. A low-temperature pumping device in accordance with Claim 1, wherein there are provided firstly a valve conduit connected at one end to said gas introduction means, and intended to be connected at the other end to a receptacle to be evacuated, secondly a movable closure clapper located within said valve conduit, intended to close said gas introductio means, and thirdly means for adjusting in position said closure clapper between a minimum position partially opening said gas-introduction means and a maximum position fully opening said gas-introduction means, wherein said auxiliary trapping means comprise a wall screen secured on and movable with respect to said closure clapper, wherein said cooling means comprise a thermal contact member between said wall screen and a cold element of said pumping chamber, and wherein said control means of said wall screen are actuated in dependency o said adjusting means of said closure clapper to form through said introduction means on the one hand a passage of minimum flow-path when said closure clapper is in the minimum position, and a passage of increasing flow-path when said closure clapper moves from said minimum position to said maximum position.
16. A low-temperature pumping device in accordance with Claim 15, wherein said adjusting means of said closure clapper comprise a control-rod coaxial with said wall screen, on which is secured coaxially said closure clapper, said gas-introduction means serving as a seating for the said closure clapper, wherein said wall screen is mounted between said closure clapper and said main low-tempera ure pumping surface, and has a diameter slightly less than the one of said gas-introduction means, so as to be able to pass freely into said gas-introduction means, and wherein said thermal contact 40902/2
17. A low-temperature pumping device in accordance xtfith Claim 16, wherein said heat-conductlv© element is a metallic braid, and said cold element of said pumping chamber is a collar coaxial with said gas-introduction means, having substantially the same diameter as th© one of said wall-screen*
18. A low-temperature pumping device in accordance with Claim 16, wherein said wall-screen is mounted on a rod coaxial with said control-rod, said coaxial rod being movable inside said control-rod through a compression spring.
19. A low-temperature pumping device in accordance with Claim 16, wherein said wall-screen comprises two parallel and coaxial discs, one of which has perforations while the other of which is plain. For the Applicants TNERS SCsCB
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7142384A FR2161484A5 (en) | 1971-11-26 | 1971-11-26 | Cold-pump assembly - for prodn of ultra-vacuum using liquid helium |
| FR7224603A FR2192620A6 (en) | 1971-11-26 | 1972-07-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IL40902A0 IL40902A0 (en) | 1973-01-30 |
| IL40902A true IL40902A (en) | 1976-01-30 |
Family
ID=26216738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL40902A IL40902A (en) | 1971-11-26 | 1972-11-22 | Low-temperature pumping device |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US3797264A (en) |
| JP (1) | JPS567066B2 (en) |
| BE (1) | BE791888A (en) |
| CA (1) | CA968170A (en) |
| CH (1) | CH569194A5 (en) |
| DE (1) | DE2257652A1 (en) |
| FR (1) | FR2192620A6 (en) |
| GB (1) | GB1415332A (en) |
| IL (1) | IL40902A (en) |
| IT (1) | IT970940B (en) |
| LU (1) | LU66552A1 (en) |
| NL (1) | NL7216050A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2321609A1 (en) * | 1975-08-22 | 1977-03-18 | Air Liquide | REGENERATION CRYOPUMP |
| EP0102787B1 (en) * | 1982-08-27 | 1986-07-16 | Comptech, Incorporated | Cryogenic pump having maximum aperture throttled port |
| DE3330146A1 (en) * | 1982-09-17 | 1984-03-22 | Balzers Hochvakuum Gmbh, 6200 Wiesbaden | DEVICE AND METHOD FOR THE QUICK REGENERATION OF AUTONOMOUS CRYOPUMPS |
| US4722191A (en) * | 1986-09-17 | 1988-02-02 | Pennwalt Corporation | High vacuum pumping system |
| US4873833A (en) * | 1988-11-23 | 1989-10-17 | American Telephone Telegraph Company, At&T Bell Laboratories | Apparatus comprising a high-vacuum chamber |
| CH686384A5 (en) * | 1992-07-21 | 1996-03-15 | Marcel Kohler | Cryopump. |
| US7611333B1 (en) * | 2002-05-07 | 2009-11-03 | Harrington Steven M | Multiple chamber pump and method |
| US9117563B2 (en) * | 2014-01-13 | 2015-08-25 | Cold Quanta, Inc. | Ultra-cold-matter system with thermally-isolated nested source cell |
| CN114893389B (en) * | 2022-06-10 | 2023-06-30 | 中国科学院上海高等研究院 | System and method for testing room temperature performance of helium pressure-reducing cooling pump set |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3371499A (en) * | 1966-11-02 | 1968-03-05 | Union Carbide Corp | Cryosorption vacuum pumping system |
| FR1587077A (en) * | 1968-08-01 | 1970-03-13 | ||
| FR2048253A5 (en) * | 1969-12-01 | 1971-03-19 | Air Liquide |
-
0
- BE BE791888D patent/BE791888A/en unknown
-
1972
- 1972-07-07 FR FR7224603A patent/FR2192620A6/fr not_active Expired
- 1972-11-16 IT IT31743/72A patent/IT970940B/en active
- 1972-11-20 CH CH1688472A patent/CH569194A5/xx not_active IP Right Cessation
- 1972-11-22 IL IL40902A patent/IL40902A/en unknown
- 1972-11-24 DE DE2257652A patent/DE2257652A1/en active Pending
- 1972-11-24 GB GB5454172A patent/GB1415332A/en not_active Expired
- 1972-11-24 CA CA157,510A patent/CA968170A/en not_active Expired
- 1972-11-24 LU LU66552A patent/LU66552A1/xx unknown
- 1972-11-27 NL NL7216050A patent/NL7216050A/xx not_active Application Discontinuation
- 1972-11-27 JP JP11812372A patent/JPS567066B2/ja not_active Expired
- 1972-11-27 US US00309701A patent/US3797264A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA968170A (en) | 1975-05-27 |
| NL7216050A (en) | 1973-05-29 |
| JPS567066B2 (en) | 1981-02-16 |
| JPS4860313A (en) | 1973-08-24 |
| IL40902A0 (en) | 1973-01-30 |
| DE2257652A1 (en) | 1973-05-30 |
| CH569194A5 (en) | 1975-11-14 |
| US3797264A (en) | 1974-03-19 |
| LU66552A1 (en) | 1973-02-01 |
| IT970940B (en) | 1974-04-20 |
| BE791888A (en) | 1973-05-24 |
| FR2192620A6 (en) | 1974-02-08 |
| GB1415332A (en) | 1975-11-26 |
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