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US4828167: Wax-pellet thermostat
9 Claims, No Drawings
A wax-pellet thermostat having a valve seat, a piston secured to the valve, a guide member slidably mounted on the piston, a valve secured to the guide member, a diaphragm secured to the guide member, and a wax provided in the cylinder. A gap is provided in the guide member around the piston so as to accumulate coolant which has entered along the piston. The gap is provided to discharge the coolant from the guide member when the wax expands to cause a part of the diaphragm to enter into the gap.
- 1. A thermostat comprising:a housing having a valve seat,a piston disposed within said housing,a guide member slidably mounted around said piston,a valve secured to said guide member for moving into and out of said valve seat,a coil spring for biasing said valve against said housing,a diaphragm secured to said guide member at a lower portion thereof, said diaphragm having an axial pocket for slidably receiving the lower portion of said piston,a heat conductive cylinder secured to said guide member and surrounding said diaphragm with a cavity,a seal member disposed at a top portion of said guide member around said piston so as to prevent the entrance of coolant between said guide member and said piston, andwax disposed in said cavity of said cylinder, said wax expanding when heated so as to cause said diaphragm and said guide member to slidably move upwards along said piston thereby moving said valve into said valve seat against the bias of said coil spring,wherein said guide member and said seal spool are arranged so as to form a gap between said guide member and said diaphragm, and around said piston when said wax is in a cooled and unexpanded state, said gap having a predetermined capacity so as to accumulate coolant which may enter between said guide member and said piston through said seal member due to the vacuum generated in said diaphragm, and wherein said guide member and said diaphragm are arranged to discharge accumulated coolant from said guide member when said wax is in a heated and expanded state, said discharge being caused by a part of said diaphragm entering into and filling said gap, said seal member being arranged so as to allow for the discharge of coolant from said gap.
U.S. Patent Documents
Foreign Patent Documents
|Document Number||Assignees||Inventors||Issue/Pub Date|
|FR2255826||VERNET EXPLOIT PROCEDES||Jul 1975|