GB721677A - Improvements in or relating to electric vacuum control devices - Google Patents
Improvements in or relating to electric vacuum control devicesInfo
- Publication number
- GB721677A GB721677A GB24733/51A GB2473351A GB721677A GB 721677 A GB721677 A GB 721677A GB 24733/51 A GB24733/51 A GB 24733/51A GB 2473351 A GB2473351 A GB 2473351A GB 721677 A GB721677 A GB 721677A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- oct
- pump
- bimetallic
- discharge gap
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
721,677. High vacuum diffusion pumps. VOGT, A. Oct. 23, 1951. [Oct. 23, 1950; Oct. 2, 1951] No. 24733/51. Class 71. A thermally-operated bimetallic switch 20, 21, Fig. 5, and a gas discharge gap 26, 28 are located in a space associated with a high vacuum diffusion pump so that when the pressure in the space falls below a predetermined value switch 20, 21 closes, owing to the change in thermal conductivity of a gas with change in pressure, to energize a solenoid 34 opening a valve connecting the pump to the space, the valve then being maintained open by relays 38, 39 unless the pressure should rise above a predetermined value at which discharge gap 26, 28 conducts to de-energize solenoid 34 without delay to isolate the pump. Bimetallic element 16<SP>1</SP> carrying contact 20 is heated by a constant current from a winding 33 of a mains transtormer 30 so that the temperature it attains is dependent on pressure. Element 18<SP>1</SP> carrying contact 21 is also bimetallic and compensates for ambient temperature variations. Separate resistance or high-frequency induction heating of element 161 is referred to. Construction of the thermally-operated switch and the gas discharge gap is shown. Control of electric heating for vaporising the motive fluid of a high vacuum diffusion pump instead of controlling the valve is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH721677X | 1950-10-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB721677A true GB721677A (en) | 1955-01-12 |
Family
ID=4531603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB24733/51A Expired GB721677A (en) | 1950-10-23 | 1951-10-23 | Improvements in or relating to electric vacuum control devices |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH288002A (en) |
| GB (1) | GB721677A (en) |
-
1950
- 1950-10-23 CH CH288002D patent/CH288002A/en unknown
-
1951
- 1951-10-23 GB GB24733/51A patent/GB721677A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH288002A (en) | 1952-12-31 |
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