A flywheel for a pump, and in particular a flywheel having a number of high density segments for use in a nuclear reactor coolant pump. The flywheel includes an inner member and an outer member. A number of high density segments are provided between the inner and outer members. The high density segm
A flywheel for a pump, and in particular a flywheel having a number of high density segments for use in a nuclear reactor coolant pump. The flywheel includes an inner member and an outer member. A number of high density segments are provided between the inner and outer members. The high density segments may be formed from a tungsten based alloy. A preselected gap is provided between each of the number of high density segments. The gap accommodates thermal expansion of each of the number of segments and resists the hoop stress effect/keystoning of the segments.
대표청구항▼
1. A flywheel for a pump, said flywheel being configured to rotate around an axis of rotation, the flywheel comprising: an inner tubular member having an outer diameter;an outer tubular member having an inner diameter;a number of segments provided in a tubular space defined between the outer diamete
1. A flywheel for a pump, said flywheel being configured to rotate around an axis of rotation, the flywheel comprising: an inner tubular member having an outer diameter;an outer tubular member having an inner diameter;a number of segments provided in a tubular space defined between the outer diameter of the tubular inner member and the inner diameter of the tubular outer member, said outer diameter of the tubular inner member and said inner diameter of the tubular outer member respectively defining an inner segment diameter and an outer segment diameter of said segments,wherein the tubular inner member, the tubular outer member and the number of segments are operably coupled to a rotatably operable shaft of the pump for rotation therewith,wherein the tubular outer member is in an interference fit with at least one of the segments,wherein a preselected gap is provided between each of the segments and is structured to accommodate thermal expansion of the segments,wherein the gap is structured to accommodate thermal expansion of each of the number of segments, andwherein the rotatable flywheel further comprises an upper pin and a lower pin, said lower pin positioned lower than said upper pin in a direction along the axis of rotation provided at each gap between the segments at the inner segment diameter. 2. The flywheel of claim 1 wherein the gap is structured to resist any hoop stress. 3. The flywheel of claim 1 wherein the gap is structured to provide radial loading of the number of segments. 4. The flywheel of claim 1 wherein the inner member is an inner tubular cylindrical member and the outer member is an outer tubular cylindrical member. 5. The flywheel of claim 1 further comprising an upper cap member and a lower cap member defining the spatial extent of the segments along the axis of rotation, and an outer shell member for containing the segments between the inner member and the outer member. 6. The flywheel of claim 1 wherein the segments comprise a tungsten based alloy. 7. The flywheel of claim 1 wherein the tubular inner member is in an interference fit with at least one of the segments. 8. The flywheel of claim 1 wherein the tubular inner member is configured to be in a splined engagement with the rotatable operable shaft of the pump. 9. A pump comprising: a shaft being configured to rotate around an axis of rotation;an impeller mounted on the shaft;a motor engaged with the shaft for turning the impeller; anda first rotatable flywheel mounted on the shaft, the first flywheel comprising: an first tubular inner member having an outer diameter;an first tubular outer member having an inner diameter;a first number of first segments provided in a first tubular space defined between the outer diameter of the first tubular inner member and the inner diameter of the first tubular outer member, said outer diameter of the first tubular inner member and said inner diameter of the first tubular outer member respectively defining a first inner segment diameter and a first outer segment diameter of said segments,wherein the first tubular inner member, the first tubular outer member and the first segments are operably coupled to a rotatably operable shaft of the pump for rotation therewith,wherein the first tubular outer member is in an interference fit with at least one of the first segments,wherein a first preselected gap is provided between each of the first segments and is structured to accommodate thermal expansion of the first segments, andwherein the first rotatable flywheel further comprises a first upper pin and a first lower pin provided at each first predetermined gap between the first segments at the first inner segment diameter. 10. The pump of claim 9 wherein the first preselected gap is structured to resist any hoop stress. 11. The pump of claim 9 wherein the first preselected gap is structured to provide radial loading of the first number of first segments. 12. The pump of claim 9 further comprising an upper cap member and a lower cap member defining the spatial extent of the first segments along the axis of rotation and an outer shell member for containing the first segments between the first tubular inner member and the first tubular outer member. 13. The pump of claim 9 wherein the first segments comprise a tungsten based alloy. 14. The pump of claim 9 wherein the first tubular inner member is in an interference fit with at least one of the first number of first segments. 15. The pump of claim 9 wherein the first inner tubular member is configured to be in a splined engagement with the rotatable operable shaft of the pump. 16. The pump of claim 9, further comprising: a second flywheel being configured to rotate around said axis of rotation, wherein the second flywheel comprises: a second tubular inner member having an outer diameter;a second tubular outer member having an inner diameter;a number of second segments provided in a second tubular space defined between the outer diameter of the second tubular inner member and the inner diameter of the second tubular outer member, said outer diameter of the inner member and said inner diameter of the outer member respectively defining a second inner segment diameter and a second outer segment diameter of said segments,wherein the second tubular inner member, the second tubular outer member and the number of second segments are operably coupled to said shaft and being configured for rotation therewith around said axis of rotation,wherein the second tubular outer member is in an interference fit with at least one of the second segments,wherein a preselected gap is provided between each of the second segments and is structured to accommodate thermal expansion of the second segments, andwherein the second flywheel further comprises a second upper pin and a second lower pin, said second lower pin positioned lower than said second upper pin in a direction along the axis of rotation provided at each gap between the segments at the second inner segment diameter; andwherein the second flywheel is in opposed relation to the first flywheel. 17. The pump of claim 16, further comprising: a pump casing, wherein the first and second flywheels are located within the pump casing and are structured to allow coolant to circulate in order to reduce the risk of destroying the first and second flywheels. 18. The pump of claim 9 in combination with a nuclear power plant. 19. The combination of claim 18 wherein the nuclear power plant is structured to generate at least 1000 MWe. 20. The combination of claim 18 wherein the nuclear power plant has a pressurized water reactor. 21. A flywheel for a pump, said flywheel being configured to rotate around an axis of rotation, the flywheel comprising: an tubular inner member having an outer diameter;an tubular outer member having an inner diameter;a number of segments provided in a tubular space defined between the outer diameter of the inner member and the inner diameter of the outer member, said outer diameter of the tubular inner member and said inner diameter of the tubular outer member respectively defining an inner segment diameter and an outer segment diameter of said segments,wherein the inner member, the outer member and the number of segments are operably coupled to a rotatably operable shaft of the pump for rotation therewith,wherein the inner member is keyed to the segments,wherein the outer member is in an interference fit with at least one of the segments,wherein a preselected gap is provided between each of the segment and is structured to accommodate thermal expansion of the segments, andwherein the rotatable flywheel further comprises an upper pin and a lower pin, said lower pin positioned lower than said upper pin in a direction along the axis of rotation provided at each gap between the segments at the inner segment diameter. 22. A pump comprising: a shaft being configured to rotate around an axis of rotation;an impeller mounted on the shaft;a motor engaged with the shaft for turning the impeller; anda flywheel mounted on the shaft and configured to rotate with said shaft around said axis of rotation, the flywheel comprising: an tubular inner member having an outer diameter;an tubular outer member having an inner diameter;a number of segments provided in a tubular space defined between the outer diameter of the tubular inner member and the inner diameter of the tubular outer member, said outer diameter of the tubular inner member and said inner diameter of the tubular outer member respectively defining an inner segment diameter and an outer segment diameter of said segments,wherein the inner member, the outer member and the number of segments are operably coupled to a rotatably operable shaft of the pump for rotation therewith,wherein the inner member is keyed to the segments,wherein the outer member is in an interference fit with at least one of the segments,wherein a preselected gap is provided between each of the segments and is structured to accommodate thermal expansion of the segments, andwherein the rotatable flywheel further comprises an upper pin and a lower pin, said lower pin positioned lower than said upper pin in a direction along the axis of rotation provided at each gap between the segments at the inner segment diameter.
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Goodyear, Brett T.; Emond, Robert W.; Yeadon, William H., Environmentally robust electromagnets and electric motors employing same for use in nuclear reactors.
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