초록 ▼

An exhaust gas cooler assembly (10) with an internally located bypass tube (50), spaced apart from and disposed within a core passage (60), with an exhaust gas inlet manifold (40) directing exhaust gas to a plurality of cooling passages (52, 54, 56, 58) or to the bypass tube (50) by means of control

An exhaust gas cooler assembly (10) with an internally located bypass tube (50), spaced apart from and disposed within a core passage (60), with an exhaust gas inlet manifold (40) directing exhaust gas to a plurality of cooling passages (52, 54, 56, 58) or to the bypass tube (50) by means of control valves (42, 44). Further provided is a detachable valve cartridge (84) with an actuator (16), with all moving components being included within the valve cartridge (84) and actuator (16).

대표청구항 ▼

What is claimed is: 1. An exhaust gas cooler assembly, comprising: a cooler shell including a first end with a cooler inlet proximate the first end, and a second end with a cooler outlet proximate the second end; a plurality of gas cooling passages extending from the first end of the cooler shell t

What is claimed is: 1. An exhaust gas cooler assembly, comprising: a cooler shell including a first end with a cooler inlet proximate the first end, and a second end with a cooler outlet proximate the second end; a plurality of gas cooling passages extending from the first end of the cooler shell to the second end of the cooler shell; a core extending from the first end of the cooler shell to the second end of the cooler shell; and a bypass tube disposed within and spaced apart from the core; wherein the bypass tube is supported within the core at a first end of the bypass tube by a plurality of dimples forming slidable supports configured to permit axial expansion and contraction of the bypass tube with respect to the core. 2. The exhaust gas cooler assembly of claim 1, wherein the bypass tube is rigidly held with respect to the core at a second end of the bypass tube. 3. The exhaust gas cooler assembly of claim 1, wherein the bypass tube is supported within the core at a second end of the bypass tube by a second plurality of dimples forming slidable supports to permit axial expansion and contraction of the bypass tube with respect to the core. 4. The exhaust gas cooler assembly of claim 1, wherein the core is characterized by an intermediate portion forming a wall defining the axial extent over which coolant is in contact with the core, and wherein the slidable supports are axially outside of the intermediate portion of the core. 5. The exhaust gas cooler assembly of claim 1, wherein the bypass tube forms the dimples, and wherein the dimples slide along the core to slidably support the bypass tube. 6. The exhaust gas cooler of claim 1, and further comprising: an inlet exhaust gas manifold at the first end of the cooler shell, the inlet exhaust gas manifold including a first flow conduit in fluid communication with the plurality of gas cooling passages, and a separate, second flow conduit in fluid communication with the bypass tube, wherein the inlet exhaust gas manifold defines a bore; and a valve assembly removably received within the bore of the inlet exhaust gas manifold, the valve assembly being configured to move between a plurality of valve positions including a first position configured to direct exhaust gas flow substantially through only the first flow conduit to the plurality of gas cooling passages, a second position configured to direct exhaust gas flow substantially through only the second flow conduit to the bypass tube, and a third position configured to direct exhaust gas flow to the plurality of gas cooling passages and the bypass tube. 7. The exhaust gas cooler assembly of claim 6, wherein the valve assembly comprises two coaxial butterfly valves including a first butterfly valve disposed within the first flow conduit and a second butterfly valve disposed within the second flow conduit. 8. The exhaust gas cooler assembly of claim 7, wherein the second flow conduit is a central flow conduit, and wherein the first flow conduit is a toroidal flow conduit surrounding the second flow conduit, and is configured to provide exhaust gas to exhaust gas cooling passages surrounding the bypass tube. 9. A method of controlling exhaust gas temperature within an exhaust gas recirculation circuit, the method comprising: providing the exhaust gas cooler assembly of claim 1; actuating a valve assembly actuator that is configured to control the flow of exhaust gas between the plurality of gas cooling passages and the bypass tube based on a set of determined parameters. 10. The method of claim 9, wherein the desired parameters are emission compliance parameters. 11. An exhaust gas cooler assembly, comprising: a cooler shell including a first end with a cooler inlet proximate the first end, and a second end with a cooler outlet proximate the second end; a plurality of exhaust gas cooling passages extending from the first end of the cooler shell to the second end of the cooler shell; a core within the cooler shell, extending from the first end of the cooler shell to the second end of the cooler shell; and a bypass tube disposed within and spaced apart from the core; wherein the bypass tube is supported within the core at a first end of the bypass tube by a slidable support configured to permit axial expansion and contraction of the bypass tube with respect to the core; and wherein the core is characterized by an intermediate portion forming a wall defining the axial extent over which coolant is in contact with the core, and wherein the slidable support is axially outside of the intermediate portion of the core. 12. The exhaust gas cooler assembly of claim 11, wherein the bypass tube is rigidly held with respect to the core at a second end of the bypass tube. 13. The exhaust gas cooler assembly of claim 11, wherein the bypass tube is supported within the core at a second end of the bypass tube by a second slidable support configured to permit axial expansion and contraction of the bypass tube with respect to the core. 14. A method of controlling exhaust gas temperature within an exhaust gas recirculation circuit, the method comprising: providing the exhaust gas cooler assembly of claim 11; actuating a valve assembly actuator that is configured to control the flow of exhaust gas between the plurality of exhaust gas cooling passages and the bypass tube based on a set of determined parameters. 15. The method of claim 14, wherein the desired parameters are emission compliance parameters. 16. The exhaust gas cooler of claim 11, wherein the exhaust gas cooling passages are parallel and disposed in a concentric array, with the core centrally disposed within the concentric array of parallel exhaust gas cooling passages, and further comprising: an inlet exhaust gas manifold at the first end of the cooler shell, the inlet exhaust gas manifold including a toroidal flow conduit in fluid communication with the plurality of exhaust gas cooling passages and a central flow conduit in fluid communication with the bypass tube; and a valve assembly characterized by a plurality of valve positions including a first position configured to direct exhaust gas flow substantially through only the toroidal flow conduit to the plurality of exhaust gas cooling passages, a second position configured to direct exhaust gas flow substantially through only the central flow conduit to the bypass tube, and a third position configured to direct exhaust gas flow to the plurality of exhaust gas cooling passages and the bypass tube. 17. The exhaust gas cooler assembly of claim 16, wherein the valve assembly comprises two coaxial butterfly valves including a first butterfly valve disposed within the first flow conduit and a second butterfly valve disposed within the second flow conduit. 18. The exhaust gas cooler assembly of claim 17, wherein the two coaxial butterfly valves share a common shaft, and the valve assembly is removably engageable from the cooler shell and inlet exhaust gas manifold without disassembly of the valve assembly. 19. An exhaust gas cooler assembly comprising: a cooler shell including a first end with a cooler inlet proximate the first end and a second end with a cooler outlet proximate the second end; a plurality of gas cooling passages extending from the first end of the cooler shell to the second end of the cooler shell; a core extending from the first end of the cooler shell to the second end of the cooler shell; a bypass tube disposed within and spaced apart from the core; an inlet exhaust gas manifold at the first end of the cooler shell, the inlet exhaust gas manifold including a first flow conduit in fluid communication with the plurality of gas cooling passages, and a separate, second flow conduit in fluid communication with the bypass tube, wherein the inlet exhaust gas manifold defines a bore; and a valve assembly removably received within the bore of the inlet exhaust gas manifold, the valve assembly being configured to move between a plurality of positions including a first position configured to direct exhaust gas flow substantially through only the first flow conduit to the plurality of gas cooling passages, a second position configured to direct exhaust gas flow substantially through only the second flow conduit to the bypass tube, and a third position configured to direct exhaust gas flow to a combination of the plurality of gas cooling passages and the bypass tube. 20. The exhaust gas cooler assembly of claim 19, wherein the second flow conduit is a central flow conduit, and wherein the first flow conduit is a toroidal flow conduit surrounding the second flow conduit, and is configured to provide exhaust gas to exhaust gas cooling passages surrounding the bypass tube. 21. The exhaust gas cooler assembly of claim 19, wherein: the bore extends through the first flow conduit and the second flow conduit; the valve assembly is configured to separately control flow rates at the first flow conduit and the second flow conduit; the valve assembly comprises two coaxial butterfly valves including a first butterfly valve disposed within the first flow conduit and a second butterfly valve disposed within the second flow conduit; the second flow conduit is a central flow conduit; and the first flow conduit is a toroidal flow conduit surrounding the second flow conduit, and is configured to provide exhaust gas to the exhaust gas cooling passages surrounding the bypass tube. 22. The exhaust gas cooler assembly of claim 19, wherein: the bore extends through the first flow conduit and the second flow conduit; and the valve assembly is configured to separately control flow rates at the first flow conduit and the second flow conduit. 23. The exhaust gas cooler assembly of claim 22, wherein the valve assembly comprises two coaxial butterfly valves including a first butterfly valve disposed within the first flow conduit and a second butterfly valve disposed within the second flow conduit.