WIPO logo
Mobile | Deutsch | Español | Français | 日本語 | 한국어 | Português | Русский | 中文 | العربية |
PATENTSCOPE

Search International and National Patent Collections
World Intellectual Property Organization
Search
 
Browse
 
Translate
 
Options
 
News
 
Login
 
Help
 
Machine translation
1. (WO1979000957) ELECTRIC HEATER ASSEMBLY FOR DIFFUSION PUMPS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1979/000957    International Application No.:    PCT/US1979/000218
Publication Date: 15.11.1979 International Filing Date: 09.04.1979
IPC:
F04F 9/00 (2006.01), H05B 3/82 (2006.01)
Applicants:
Inventors:
Priority Data:
898567 21.04.1978 US
Title (EN) ELECTRIC HEATER ASSEMBLY FOR DIFFUSION PUMPS
(FR) ENSEMBLE DE CHAUFFAGE ELECTRIQUE POUR POMPES A DIFFUSION
Abstract: front page image
(EN)A diffusion pump includes a flat metal boiler plate (13) having an upper face (14) defining a floor for a pool of a vaporizable diffusion pump fluid or oil and a flat lower face (16) against which the metallic sheath (33) of a tubular electric heater (17) is pressed by a coextensive massive clamping plate (19). The heater (17) has a tendency to be overheated if only air is its thermal load. To prevent overheating of the heater (17) because of variations in the geometry of the heater sheath (33) which tend to cause air spaces between the sheath (33) and the face (16) of the boiler plate (13), a thin flexible metal crush plate (18) is disposed between the clamping plate (19) and the heater. The crash plate (18) has a plurality of spaced, raised dimples (37) adapted to contact many portions of the heater sheath (33) throughout the length of the sheath. As the clamping plate (19), the crush plate (18) and the heater (17) are urged toward the boiler plate (13) by nut and bolt assemblies (20, 21), the dimples (37) are deformed wherever they are in contact with the heater sheath. The deformed dimples (37) urge virtually the entire length of the sheath (33) into contact with the face (16) of the boiler plate and insure that pressure is applied to the heater sheath at the points of contact. Since there are many points of contact, the occurrence of local overheating, i.e., hot spots, is virtually eliminated.
(FR)Une pompe a diffusion comprend une plaque de chaudiere metallique plate (13) ayant une face superieure (14) definissant le fond d"un bassin de fluide ou huile vaporisable d"une pompe a diffusion et une face inferieure plate (16) contre laquelle la gaine metallique (33) d"un appareil de chauffage electrique tubulaire (17) est comprimee par une plaque massive de fixation, de meme etendue, (19). Le dispositif de chauffage (17) a tendance a surchauffer si l"air seul constitue sa charge thermique. Pour eviter le surchauffage du dispositif (17) du aux variations de geometrie de la gaine (33) qui a tendance a laisser des espaces d"air entre la gaine (33) et la face (16) de la plaque de chaudiere (13), une plaque metallique, mince et flexible, d"ecrasement (18) est disposee entre la plaque de fixation (19) et le rechauffeur. La plaque d"ecrasement ( 18) possede une pluralite d"ondulations espacees (37) qui sont adaptees pour etre en contact en de nombreux points de la gaine (33) sur toute la longueur de cette derniere. De meme que pour la plaque de fixation (19), la plaque d"ecrasement (18) et le dispositif de chauffage (17) sont presses contre la plaque de chaudiere (13) par des assemblages a boulons et ecrous (20, 21), et les ondulations (37) sont deformees partout ou elles sont en contact avec la gaine (33). Les ondulations deformees (37) poussent la gaine (33) pratiquement sur toute son etendue en la mettant en contact avec la face (16) de la plaque de chaudiere et permettent d"assurer une pression sur la gaine de chauffage aux points de contact. Puisqu"il y a de nombreux points de contact, le surchauffage localise (c"est-a-dire les points chauds), est de ce fait elimine.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)