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US 6,742,716 B1Granted
Thermostat
AssigneeStandard-Thomson Corporation
InventorsWayne R. Duprez, Ken Zhao, Matthew Fratantonio
Life of this patent
Estimating the term…
Abstract
A thermostat comprises a valve and an electric valve actuator to move the valve against a valve seat. The thermostat comprises a wax motor responsive to temperature to move the valve away from the valve seat.
Claims23
A thermostat comprising
- a valve,
- an electric valve actuator comprising an output member axially movable to a valve-seating position to move the valve into contact with a valve seat,
- a bearing surface, and
- a wax motor responsive to a predetermined temperature to act against the bearing surface to move the valve axially away from the valve seat and relative to the bearing surface when the output member is positioned in the valve-seating position.
1 more element
A thermostat for controlling flow of coolant to control the temperature of a heated device, the thermostat comprising
- a house having a bearing surface a valve positioned in the housing,
- an electric valve actuator comprising an output member axially movable relative to the housing to a valve-seating position to move the valve relative to the housing axially in coolant into contact with a valve seat, the valve comprising a coolant passageway extending axially through the valve to receive coolant therethrough to facilitate axial movement of the valve in the coolant by the output member, and
- a wax motor responsive to a predetermined temperature to act against the housing to move the valve axially away from the valve seat and relative to the bearing surface when the output member is positioned in the valve-seating position.
A thermostat for controlling flow of coolant between a heated device and a heat exchanger to control the temperature of the heated device, the thermostat comprising
- a housing comprising a coolant inlet to admit coolant from the heated device into the housing, a first coolant outlet to discharge coolant to the heat exchanger, and a second coolant outlet to discharge coolant back to the heated device to bypass the heat exchanger,
- a valve positioned in the housing,
- first and second valve seats,
- an electric valve actuator comprising an output member and an electric motor to axially move the output member relative to the housing between a first valve-seating position positioning the valve against the first valve seat to block coolant flow between the coolant inlet and the first coolant outlet and apart from the second valve seat to allow coolant flow between the coolant inlet and the second coolant outlet and a second valve-seating position positioning the valve against the second valve seat to block coolant flow between the coolant inlet and the second coolant outlet and apart from the first valve seat to allow coolant flow between the coolant inlet and the first coolant outlet, and
- a wax motor positioned in the housing and comprising a piston and a thermal expansion device comprising wax responsive to a predetermined temperature to cause the piston to act against the housing to move the thermal expansion device axially relative to the piston to move the valve axially away from the first valve seat to allow flow between the coolant inlet and the first coolant outlet when the electric motor positions the output member in the first valve-seating position.
2 more elements
Dependencies are inferred from the claim text.