Automatic temperature and humidity regulation – Snap-acting – Including a permanent magnet
Patent
1990-01-22
1991-04-30
Tapolcal, William E.
Automatic temperature and humidity regulation
Snap-acting
Including a permanent magnet
138 45, 236 93R, 251117, G05D 2310
Patent
active
050110756
ABSTRACT:
A fluid flow control device primarily intended for throttling the flow of liquid refrigerant between two flow rates. The device includes a disc which moves between two distinct positions with a snap action in response to changes in temperature of the refrigerant. The disc is connected at its center to a stem member having an axial bore aligned with and of smaller cross-sectional area than the outlet passage of a flow chamber wherein the disc and stem are positioned. When refrigerant temperature increases to a predetermined level, the disc moves the stem into contact with the chamber wall surrounding the outlet orifice, thereby limiting refrigerant flow to that which passes through the relatively smaller bore of the stem member. When refrigerant temperature drops sufficiently, the disc snaps back to the other position, moving the end of the stem away from the outlet orifice to permit flow at a higher rate. A pre-tensioning arm is also provided for placing a biasing force on the disc in one position thereof to control more precisely the temperature at which it moves to the other position.
REFERENCES:
patent: 2214459 (1940-09-01), Gottlieb
patent: 2613874 (1952-10-01), Thomas
patent: 2647017 (1953-07-01), Coulliette
patent: 3853268 (1974-12-01), Schneider
patent: 4060158 (1927-11-01), Kikuchi
patent: 4278083 (1981-07-01), Young et al.
patent: 4860795 (1989-08-01), Oten
McGuire Charles S.
Tapolcal William E.
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