Temperature responsive flow control valves for engine cooling systems
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01P-007/16
F01P-007/14
출원번호
US-0836060
(2004-04-30)
우선권정보
GB-0310122.7(2003-05-02)
발명자
/ 주소
Hutchins,William R.
출원인 / 주소
Ford Global Technologies, LLC
인용정보
피인용 횟수 :
7인용 특허 :
6
초록▼
An engine cooling system has a primary cooling circuit with a pump to circulate liquid coolant through an engine, the coolant being returned to the pump via a radiator and a bypass arranged in parallel. A temperature-responsive control valve controls flow as between said radiator and the bypass. The
An engine cooling system has a primary cooling circuit with a pump to circulate liquid coolant through an engine, the coolant being returned to the pump via a radiator and a bypass arranged in parallel. A temperature-responsive control valve controls flow as between said radiator and the bypass. The valve housing defines: a hot inlet connected to the bypass, a cold inlet connected to the radiator, and a valve chamber. The valve further includes a first valve member in the valve chamber movable between two limits to control the flow of coolant from the hot inlet to the outlet, a second valve member in the valve chamber movable between two limits to control coolant flow from the cold inlet to the outlet; and a temperature-responsive actuator to move the first and second valve members.
대표청구항▼
I claim: 1. A temperature-responsive control valve for use in an engine cooling system, the engine cooling system having a primary cooling circuit having a pump to circulate liquid coolant through an engine, the coolant being returned to the pump via a radiator and a bypass arranged in parallel, th
I claim: 1. A temperature-responsive control valve for use in an engine cooling system, the engine cooling system having a primary cooling circuit having a pump to circulate liquid coolant through an engine, the coolant being returned to the pump via a radiator and a bypass arranged in parallel, the control valve controlling flow as between said radiator and the bypass, said control valve comprising: a housing defining: a first or hot inlet which in use is connected to the bypass; a second or cold inlet which in use is connected to the radiator; and a valve chamber; a first valve member disposed in said valve chamber movable between first and second limits to control the flow of coolant from said hot inlet to said outlet; a second valve member disposed in said valve chamber movable between first and second limits to control coolant flow from said cold inlet to said outlet; and a temperature-responsive actuator to move said first and second valve members; wherein the control valve is operable: to substantially prevent coolant flow from said hot and cold inlets to said outlet when a temperature of the coolant sensed by said temperature-responsive actuator is below a first predetermined temperature; to permit coolant flow only from said hot inlet to said outlet when said sensed temperature is between said first predetermined temperature and a second higher predetermined temperature; to permit coolant flow from both of said inlets to said outlet when said sensed temperature is between said second predetermined temperature and a third higher predetermined temperature; and to permit coolant flow only from said cold inlet to said outlet when said sensed temperature exceeds said third predetermined temperature. 2. The valve claimed in claim 1 wherein said first valve member is arranged so that at first limit of movement, which corresponds to a sensed temperature at or below said first predetermined temperature, said first valve member is operable to substantially prevent coolant flow from said hot inlet to said outlet; at or near said second limit of movement, which corresponds to a sensed temperature at or above said third predetermined temperature, said first valve member is operable to substantially prevent coolant flow from said hot inlet to said outlet; and when said sensed temperature is above said first predetermined temperature but below said third predetermined temperature, said first valve member is operable to permit coolant flow from said hot inlet to said outlet. 3. The valve claimed in claim 1 wherein said second valve member is operable to substantially prevent coolant flow from said cold inlet to said outlet when said sensed temperature is below said second predetermined temperature and to permit coolant flow from said cold inlet to said outlet when said sensed temperature is at or above said second predetermined temperature. 4. The valve claimed in claim 1 wherein said first and second valve members are axially movable in said housing such that in a first directionsaid valve members move towards said cold inlet and away from said hot inlet and in a second direction said valve members can move towards said hot inlet and away from said cold inlet. 5. The valve claimed in claim 4 wherein said first valve member comprises a tubular valve spool having a bore defining a coolant flow passage for coolant from said hot inlet and said second valve member comprises a flange which is positioned between said valve spool and said cold inlet. 6. The valve claimed in claim 4 wherein said temperature responsive actuator is spring biased towards said cold inlet and is operable to move said first and second valve members further away from said cold inlet as said sensed temperature is increased. 7. The valve claimed in claim 5 wherein said valve spool has a sealing surface to form a seal with a complementary sealing surface in said housing to substantially prevent coolant flow from said bore of said valve spool to said outlet when said sealing surfaces are in contact. 8. The valve claimed in claim 5 wherein said valve spool further comprises an annular flange. 9. The valve claimed in claim 8 wherein said annular flange has a cylindrical skirt. 10. The valve claimed in claim 7 wherein said valve spool further comprises an annular flange, said sealing surface on said valve spool being a chamfered surface formed on said annular flange and said complementary sealing surface being a chamfered surface formed in said housing between said cold inlet and said valve chamber. 11. The valve claimed in claim 7 wherein, t, a restricted flow from said hot inlet to said outlet through said bore of said valve spool is allowed when said two sealing surfaces are in contact. 12. The valve claimed in claim 8 wherein spacers are interposed between said annular flange and said second valve member to allow coolant flow from said bore of said valve spool and past said sealing surfaces to said outlet. 13. The valve claimed in claim 4 wherein said first valve member is spring biased towards said cold inlet. 14. The valve claimed in claim 4 wherein said first valve member comprises a tubular valve spool having a bore defining a coolant flow passage for coolant from said hot inlet and said second valve member comprises a flange which is positioned between the valve spool and the cold inlet, a biasing spring being interposed between said valve spool and said housing so that said first valve member is spring biased towards said cold inlet. 15. The valve claimed in claim 14 wherein an annular washer is located in said valve chamber at a juncture of said hot inlet and said valve chamber, said biasing spring abutting said annular washer so that in use said annular washer can move away from said hot inlet against said biasing spring to permit flow of coolant from said hot inlet to said outlet when pressure in said hot inlet exceeds pressure in said outlet by a magnitude dependent on a load of said biasing spring. 16. The valve claimed in claim 15 wherein said valve spool has a cylindrical outer surface, said annular washer being a sliding fit over cylindrical outer surface of said valve spool. 17. The valve claimed in claim 5 wherein a plug is provided in said hot inlet for engagement with said bore of said valve spool when said valve spool is at or near its limit of travel towards said hot inlet, the arrangement being such that, when said plug is significantly engaged with said bore in said first valve member, substantially no coolant can flow from said hot inlet into said bore of said valve spool. 18. The valve claimed in claim 5 wherein said temperature responsive actuator has an actuator body slidable in said bore of said valve spool. 19. The valve claimed in claim 18 and further comprising an abutment in said cold inlet, said temperature responsive actuator having a pushrod interposed between the abutment and the actuator body to move the actuator body away from the cold inlet. 20. The valve claimed in claim 1 wherein temperature sensed by said temperature responsive actuator is a combination of a coolant temperature of in said hot inlet and a coolant temperature in said cold inlet. 21. The valve claimed in claim 20 wherein said temperature responsive actuator is arranged such that said coolant temperature in said hot inlet is dominant in control of coolant through said hot and cold inlets. 22. The valve claimed in claim 20 wherein said sensed temperature is equal to ((X*T1)+(Y*T2)) where X is selected between 0.6 and 0.95, Y is selected between 0.4 and 0.05, wherein T1 is said coolant temperature in said hot inlet and T2 is said coolant temperature in said cold inlet. 23. The valve claimed in claim 1 wherein the engine cooling system further comprises a secondary cooling circuit wherein a secondary heat exchanger is supplied with coolant for return to said pump, the valve further comprising: a secondary outlet connected to said valve chamber to provide coolant to said secondary heat exchanger. 24. The valve claimed in claim 23 wherein said first valve member is adapted to selectively open and close said secondary outlet depending upon said sensed temperature. 25. The valve claimed in claim 24 wherein said first and second valve members are axially movable in said housing such that in one direction said valve members move towards said hot inlet and away from said cold inlet and in the other direction said valve members move towards said cold inlet and away from said hot inlet, said first valve member comprising a tubular valve spool having a bore defining a coolant flow passage for coolant from said hot inlet and an annular flange having a cylindrical skirt which cooperates with said secondary outlet, said temperature responsive actuator being spring biased towards said cold inlet and operable to move said first and second valve members away from said cold inlet as said sensed temperature is increased. 26. The valve claimed in claim 24 wherein said secondary outlet is closed when said sensed temperature is below said first predetermined temperature, is open when said sensed temperature is above said second predetermined temperature and is partially open when said sensed temperature is above said first predetermined temperature but below said second predetermined temperature. 27. The valve claimed in claim 1 wherein the engine cooling system further comprises an auxiliary circuit, coolant being taken from the engine through an auxiliary device and returned to the pump, the valve further comprising an auxiliary inlet to return coolant from said auxiliary device to said outlet. 28. The valve claimed in claim 27 wherein the first valve member is adapted to selectively open and close said auxiliary inlet depending upon said sensed temperature. 29. The valve claimed in claim 28 wherein said first and second valve members are axially movable in said housing such that in a first direction said valve members move towards said hot inlet and away from said cold inlet and in a second direction said valve members move towards said cold inlet and away from said hot inlet, said first valve member comprising a tubular valve spool having a bore defining a coolant flow passage for coolant from said hot inlet and an annular flange having a cylindrical skirt which cooperates with said auxiliary inlet, said temperature responsive actuator being spring biased towards said cold inlet and operable to move said first and second valve members further away from said cold inlet as said sensed temperature is increased. 30. The valve claimed in claim 28 wherein said auxiliary inlet is closed when said sensed temperature is above said third predetermined temperature, is open when said sensed temperature is below said second predetermined temperature and is partially open when said sensed temperature is above said second predetermined temperature but below said third predetermined temperature. 31. The valve claimed in claim 29 wherein said valve spool has a window which allows coolant in said valve chamber to contact said actuator body over a substantial area while said actuator body blocks said window for flow from said bore of said valve spool into said valve chamber. 32. An engine cooling system, comprising: a primary cooling circuit wherein a pump circulates liquid coolant to an engine, coolant from the engine is returned to the pump through a radiator and a bypass arranged in parallel and a temperature responsive control valve controls flow as between the radiator and the bypass, wherein the control valve is a temperature responsive control valve having a housing defining a first or hot inlet connected to the bypass, a second or cold inlet connected to the radiator, an outlet connected to the pump, a valve chamber, a first valve member in the valve chamber and movable between two limits to control the flow of coolant from the hot inlet to the outlet, a second valve member movable between two limits to control coolant flow from the cold inlet to the outlet and a temperature responsive actuator to move the first and second valve members, the control valve being operable to substantially prevent coolant flow from the hot and cold inlets to the outlet when the temperature of the coolant sensed by the temperature responsive actuator is below a first predetermined temperature, to permit coolant flow only from the hot inlet to the outlet when the sensed temperature is between the first predetermined temperature and a second higher predetermined temperature, to permit coolant flow from both of the inlets to the outlet when the sensed temperature is between the second temperature and a third higher temperature and to permit coolant flow only from the cold inlet to the outlet when the sensed temperature exceeds the third predetermined temperature. 33. A cooling system as claimed in claim 32 and further comprising a secondary cooling circuit wherein a secondary heat exchanger is supplied with coolant for return to the pump, the valve further comprising a secondary outlet connected to the valve chamber to provide coolant to the secondary heat exchanger. 34. A cooling system as claimed in claim 32 and further comprising an auxiliary circuit, coolant being taken from the engine through an auxiliary device and returned to the pump, the valve further comprising an auxiliary inlet to return coolant from the auxiliary device to the outlet.
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이 특허에 인용된 특허 (6)
Cook Andre (Arpajon FRX) Chamot Jean P. (Arpajon FRX), Apparatus for controlling the flow of cooling fluid in an engine.
White,Brian R.; Hall,Ronald L.; Townsend,Tom N., Apparatus and method for controlling the operation of a cooling system for a marine propulsion device.
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