Thermostatic device and related method
View Patent ↗A thermostatic device for selectively opening and closing one of more apertures used for controlling the flow of a coolant fluid includes a housing, at least one fixed element and at least one moveable element. The at least one fixed element is fixedly interconnected to the housing. The at least one moveable is moveably connected to the housing. A fluid path passes through the fixed element and the moveable element. The fluid path is opened and closed in response to movement of the moveable element relative to the fixed element such that when the moveable element is in a first position the fluid path is closed and when the moveable element is in a second position the fluid path is open. A temperature responsive bi-metal element is coupled to the moveable element for moving the moveable element between the first position and the second position.
1. A thermostatic assembly for opening and closing one or more apertures used for controlling the flow of a coolant fluid, the thermostatic assembly comprising:
a housing;
a first fixed element fixed interconnected to the housing;
first and second moveable elements moveably interconnected to the housing;
a fluid path passing through the fixed element, the fluid path being open and closed in response to movement of the moveable elements relative to the fixed element such that when the moveable elements are in a first position the fluid path is closed and the coolant fluid is prevented from exiting the housing and when the moveable elements are in a second position the fluid path is open and the coolant fluid exits the housing;
a temperature responsive element coupled to the moveable elements for moving the moveable elements between the first position and the second position, the temperature responsive element being a bi-metal element;
wherein the first moveable element selectively opens and closes at least two apertures of the first fixed element and the second moveable element selectively opens and closes at least two apertures of the first fixed element to control the flow of a fluid through the first fixed element such that the fluid pressure does not tend to bias the first and second moveable elements into an open position or a closed position;
wherein the first fixed element includes a stationary housing with two or more apertures; the first moveable element includes an internal rotor that seals one or more apertures and the second moveable element includes an external rotor that seals the same number of apertures as the internal rotor; and
a shaft connecting the internal and external rotors with the temperature responsive element.
2. The thermostatic assembly of claim 1 , wherein the bi-metal element is shaped like a coil.
3. The thermostatic assembly of claim 1 , in combination with an internal combustion engine.
4. The thermostatic assembly of claim 1 , further comprising a shaft that connects the first moveable element to the bi-metal element to transmit movement of the bi-metal element to the first moveable element.
5. The thermostatic assembly of claim 4 , further comprising a fastener at the end of the shaft to define the relative position between the first moveable and the first fixed elements and ensure constant contact between the first moveable and first fixed elements.
6. The thermostatic assembly of claim 5 , wherein the fastener is a self-locking nut precision torqued for contact between the first moveable and the first fixed elements.
7. The thermostatic assembly of claim 1 , wherein the bi-metal element rotates the first moveable element in a first direction within response to a temperature above a predetermined temperature and in a second opposite direction in response to a temperature below the predetermined temperature.
8. The thermostatic assembly of claim 1 , wherein the fluid path is partially open at a first temperature and fully open at a second temperature.
9. The thermostatic assembly of claim 1 , wherein the first moveable element includes at least one rotor whose angular position is controlled by the bi-metal element.
10. The thermostatic assembly of claim 1 , wherein the first moveable element includes at least one valve or sealing plate whose position is controlled by the bi-metal element.
11. The thermostatic assembly of claim 1 , wherein the bi-metal element is a bi-metal strip or beam that bends into a desired position in response to fluid temperature changes to selectively opens and closes the fluid path.
12. The thermostatic assembly of claim 1 , wherein the temperature responsive element is based on an electric or electronic sensor, which controls an electric motor, an electric solenoid or an electromagnetic device in order to move the at least one rotor to the desired position.
13. The thermostatic assembly of claim 1 , wherein the temperature responsive element moves the first and second moveable elements in one direction on rising temperature of the engine coolant and the opposite direction with falling temperature.
14. The thermostatic assembly of claim 1 , wherein pressure of the engine coolant has no or no significant effect upon proper operation of the thermostatic assembly.
15. The thermostatic assembly of claim 1 , wherein one half of the apertures of the first fixed element are sealed from inside the stationary housing and the other half of the apertures of the first fixed element are sealed from outside the stationary housing by the action of the temperature responsive element.
16. The thermostatic assembly of claim 15 , wherein a torque required from the temperature responsive element in order to close or open the apertures of the first fixed element is not affected by a pressure of the coolant fluid.
17. The thermostatic assembly of claim 1 in combination with a bypass for controlling the flow of an engine coolant fluid.