A heat exchanger for cooling a liquid has an inlet and an outlet for a liquid to be cooled. A bypass is provided that bypasses the heat exchanger. A valve controls flow of liquid into the heat exchanger or into the bypass. The valve has a valve seat, a valve cone, and at least one spring made of a s
A heat exchanger for cooling a liquid has an inlet and an outlet for a liquid to be cooled. A bypass is provided that bypasses the heat exchanger. A valve controls flow of liquid into the heat exchanger or into the bypass. The valve has a valve seat, a valve cone, and at least one spring made of a shape memory material. The at least one spring counteracts a liquid pressure existing in the inlet.
대표청구항▼
1. A heat exchanger assembly for cooling a liquid, comprising: a heat exchanger include a fluid inlet and a fluid outlet for a liquid to be cooled;a liquid filter that comprises a filter housing;a filter element arranged inside said filter housing;wherein said filter element has a dirty side and sai
1. A heat exchanger assembly for cooling a liquid, comprising: a heat exchanger include a fluid inlet and a fluid outlet for a liquid to be cooled;a liquid filter that comprises a filter housing;a filter element arranged inside said filter housing;wherein said filter element has a dirty side and said dirty side communicates with said outlet, wherein said bypass connects said inlet to said dirty side of said filter element:a bypass that bypasses the heat exchanger; anda valve controlling flow of the liquid into the heat exchanger or into said bypass;wherein said valve has a valve seat, a valve cone, and at least one spring made of shape memory material, wherein said at least one spring counteracts a liquid pressure existing in said inlet;wherein said valve is inserted into said bypass;wherein said valve is configured as a unit, inserted into an open end of said bypass in a completely assembled state;wherein the shape memory material of said at least one spring of shape memory material exhibits a change of mechanical properties in a range of approximately 60-100 degrees C.;wherein said valve below a limit temperature of approximately 60 to 100 degrees C. has an opening pressure of approximately 0 to 0.4 bar; andwherein said valve above a limit temperature of approximately 60 to 100 degrees C. has an opening pressure of approximately 0.4 to 1.0 bar. 2. The heat exchanger assembly according to claim 1, wherein said bypass connects said inlet immediately with said outlet by bypassing the heat exchanger. 3. The heat exchanger assembly according to claim 1, comprising a liquid filter that comprises a filter housing and a filter element arranged inside said filter housing;wherein said filter element has a clean side and said clean side communicates with said inlet, wherein said bypass connects said clean side to said outlet. 4. The heat exchanger assembly according to claim 1, comprising a liquid filter that comprises a filter housing and a filter element arranged inside said filter housing, wherein said filter element has a dirty side and said dirty side communicates with said outlet, wherein said bypass connects said inlet to said outlet by bypassing the heat exchanger. 5. The heat exchanger assembly according to claim 1, wherein said at least one spring of shape memory material has an extrinsic two-way behavior. 6. The heat exchanger assembly according to claim 5, wherein a restoring force for said at least one spring of shape memory material is provided by said liquid pressure of the liquid. 7. The heat exchanger assembly according to claim 1, wherein said at least one spring of shape memory material has an intrinsic two-way effect. 8. The heat exchanger assembly according to claim 1, wherein said at least one spring of shape memory material alone provides a closing force for said valve. 9. The heat exchanger assembly according to claim 1, wherein said at least one spring of shape memory material is the only spring of said valve for controlling said flow of liquid into said bypass. 10. The heat exchanger assembly according to claim 1, wherein said at least one spring of shape memory material has a cold shape and is not tensioned in said valve in said cold shape. 11. The heat exchanger assembly according to claim 1, wherein said at least one spring of shape memory material has a cold shape and is tensioned in said valve in said cold shape. 12. A heat exchanger unit for cooling and filtering a liquid, the heat exchanger unit comprising: a heat exchanger element with an inlet opening and an outlet opening for the liquid to be cooled;a bypass for bypassing said heat exchanger element; anda valve for controlling a liquid stream through said heat exchanger element and through said bypass;wherein said valve comprises at least one spring comprised of a shape memory material and counteracting the liquid pressure in an inlet passage of the heat exchanger unit;a filter comprising a filter housing and a filter insert with a filter element inserted in said filter housing, wherein said filter insert comprises a lower terminal disk and a non-return diaphragm arranged at said lower terminal disk, wherein said non-return diaphragm divides a dirty side of said filter into an inlet chamber and an annular chamber, wherein said annular chamber surrounds said filter element, wherein a return flow from said annular chamber into said inlet chamber is prevented; andwherein said inlet passage is connected to said inlet opening of said heat exchanger element and wherein said bypass connects said inlet passage to said inlet chamber;wherein said bypass having said valve is arranged within said inlet passage;wherein said bypass is parallel to a main axis of said filter insert;wherein said bypass with said valve arranged therein is a straight continuation of said inlet passage;wherein an open end of said bypass in said filter housing is oriented in a direction towards a lid of said filter housing;wherein said valve is configured as a unit, inserted into said open end of said bypass in a completely assembled state. 13. The heat exchanger unit according to claim 12, wherein said filter insert comprises a central tube that connects a clean side of said filter element with an outlet passage of said filter. 14. The heat exchanger unit according to claim 13, further comprising a pressure relief valve arranged in said central tube. 15. The heat exchanger unit according to claim 13, wherein said central tube has an axial projection that extends past said lower terminal disk, wherein said axial projection penetrates said inlet chamber and is connected seal-tightly to said outlet passage. 16. The heat exchanger unit according to claim 15, wherein said axial projection has at the end facing said outlet passage a first and a second radial seals between which seals a radial outlet opening is provided through which the fluid after passing through said filter element flows into said outlet passage, wherein said first seal separates said inlet chamber from said outlet passage, wherein said axial projection in an area adjoining said radial outlet opening is configured as a closure plug that closes off an oil drain passage of said filter. 17. The heat exchanger unit according to claim 12, wherein said at least one spring of shape memory material has an extrinsic two-way behavior;wherein a restoring force for said at least one spring of shape memory material is provided by said liquid pressure of the liquid in said inlet passage;wherein said at least one spring of shape memory material has an intrinsic two-way effect;wherein said at least one spring of shape memory material alone provides a closing force for said valve;wherein said valve below a limit temperature of approximately 60 to 100 degrees C. has an opening pressure of approximately 0 to 0.4 bar;wherein said valve above a limit temperature of approximately 60 to 100 degrees C. has an opening pressure of approximately 0.4 to 1.0 bar;wherein the shape memory material of said at least one spring of shape memory material exhibits a change of mechanical properties in a range of approximately 60-100 degrees C. 18. A method for retrofitting a heat exchanger assembly, or a heat exchanger unit, comprising the step of: integrating a valve with a shape memory material into the heat exchanger assembly or the heat exchanger unit, wherein the heat exchanger assembly is configured according to claim 1 or the heat exchanger unit is embodied according to claim 12. 19. A method for controlling flow through a bypass passage for bypassing a heat exchanger for liquid lubricant oil circulation of an internal combustion engine, the method comprising the steps: taking in the lubricating oil into a collecting chamber or passage from where an inlet to the heat exchanger and a bypass for bypassing the heat exchanger are branched off;loading a valve that comprises a spring, that is made of shape memory alloy and arranged in or upstream of the bypass, with liquid pressure and temperature of the liquid flowing into the collecting chamber wherein the spring of shape memory material provides the closing force of the valve acting counter to the liquid pressure, wherein below a limit temperature of approximately 60 to 100 degrees C. said valve has an opening pressure of approximately 0 to 0.4 bar;changing the spring constant and the closing force of the valve spring of shape memory material by a microstructural change that occurs when the temperature of the shape memory microstructure surpasses a limit temperature of 60 to 100 C. such that said valve has an opening pressure of approximately 0.4 to 1.0 bar;opening or closing the valve depending on the liquid pressure and the closing pressure of the valve;wherein the closing pressure of the valve is determined by the shape memory spring and the microstructural state alone.
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이 특허에 인용된 특허 (13)
Martin, Hans-Joachim; Fritzer, Anton, Bypass valve for a cooler connected downstream of a hydraulic unit.
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