Lift piston assembly
阅读：284发布：2022-11-26
专利汇可以提供Lift piston assembly专利检索，专利查询，专利分析的服务。并且A hydraulic actuator for a nuclear reactor control rod assembly which may be positioned entirely within a reactor pressure vessel. The actuator is characterized by a lift piston which cooperates with the fuel assembly upper end fitting, at the lower end of the piston guide cylinder, and with a lift buffer assembly, at the upper end of the cylinder, to provide for both lifting of the control rod and for holding the control rod at the two limits of motion thereof.，下面是Lift piston assembly专利的具体信息内容。
1. An improved hydraulic control rod actuator for a nuclear reactor, the reactor including a pressure vessel having a fuel assembly disposed therein and means delivering coolant under pressure to the interior of the vessel for circulation through the fuel assembly, the fuel assembly including a plurality of elements containing fissionable fuel and a plurality of neutron absorber elements disposed for movement in guide tubes located in the fuel assembly, the interiors of the guide tubes being exposed to the coolant, the reactor further including means establishing a control pressure less than the normal coolant pressure maintained within the pressure vessel, said control rod actuator comprising: cylinder means located within the pressure vessel, said cylinder means being defined by a tubular member of substantially constant internal cross-sectional area, said cylinder means tubular member being oriented substantially vertically and axially aligned with an absorber element guide tube; means defining a valve seat at the lower end of said cylinder means tubular member, said valve seat defining means being apertured whereby communication to the interior of said cylinder means is provided therethrough; first coupling means for connecting said valve seat defining means to the absorber element guide tube axially aligned therewith; buffer means positioned at the upper end of said cylinder means, said buffer means having a passage therethrough communicating at a first end with the interior of said cylinder means; piston means positioned for movement within said cylinder means, said piston means having a first extension adapted to pass out of the lower end of said cylinder means through said valve seat defining means for mechanically connecting said piston means to a neutron absorber element, said piston means having a second extension oppositely disposed from said first extension, said second extension being at least partly tapered and adapted to cooperate with a portion of said buffer means defined passage to gradually terminate flow through said passage as said piston means approaches the upper end of said cylinder means, the combined weight of said piston means and absorber element being sufficient to overcome upwardly directed forces resulting from exposure to the pressurized coolant whereby said piston means will be normally seated on said valve seat defining means; and second coupling means for connecting the second end of said buffer means defined passage to the control pressure establishing means whereby a pressure less than the pressure vessel internal coolant pressure may be selectively applied to the interior of said cylinder means to cause upward movement of said piston means.
2. The apparatus of claim 1 wherein said buffer means comprises: a first portion defining an apertured valve seat at the upper end of said cylinder means tubular member, the minimum cross-sectional area of the aperture in said buffer means first portion valve seat being greater than the maximum cross-sectional area of said piston means second extension; a passage defining second portion, the passage defined by said second portion being axially aligned with said cylinder means and coaxial with the aperture in said first portion, said second portion passage being adapted to receive said piston means second extension and having a cross-sectional area which exceeds that of said second extension along the length thereof which is received in said passage; and a passage defining third portion, the passage defined by said third portion being adapted to couple said second portion passage to a source of control pressure via said second coupling means.
3. The apparatus of claim 2 wherein said piston means comprises: means defining a high loss piston, said high loss piston defining means having at least first and second curved surfaces which cooperate with the valve seats defined at the opposite ends of said cylinder meaNs respectively by said valve seat defining means and buffer means first portion to provide sealing with said piston means at its opposite limits of movement.
4. The apparatus of claim 3 wherein the portions of said piston means which define said curved surfaces are of circular cross-section and wherein said first and second extensions are of circular cross-section and smaller diameter than said surface defining portions and extend coaxially thereof.
5. The apparatus of claim 4 wherein said second piston means extension comprises: a first frustoconical member having its larger diameter end affixed to said high loss piston defining means; and at least a second frustoconical member having a taper different from that of said first frustoconical member, said second frustoconical member having its larger diameter end coupled to the smaller diameter end of said first frustoconical member.
6. The apparatus of claim 5 wherein said high loss piston defining means comprises: a first disc member, said first disc member having a spherical shaped portion which defines said first curved surface; a second disc member, said second disc member having a spherical shaped portion which defines said second curved surface; and shaft means intermediate said disc members, said shaft means coupling said members and having a diameter less than the diameter of said disc members.
7. The apparatus of claim 6 wherein the valve seat at the lower end of said cylinder means has a frustoconical seating surface which cooperates with said first disc member to provide a line of contact therebetween with said piston means at its limit of motion toward the first end of said cylinder means.
8. The apparatus of claim 7 wherein the valve seat at the upper end of said cylinder means has a frustoconical seating surface which cooperates with said second disc member to provide a line of contact therebetween with said piston means at its limit of motion toward the second end of said cylinder means.
9. The apparatus of claim 6 wherein the valve seat at the lower end of said cylinder means has a frustoconical seating surface which cooperates with said first disc member to provide a line of contact therebetween with said piston means at its limit of motion toward the lower end of said cylinder means.
10. The apparatus of claim 4 wherein the valve seat at the upper end of said cylinder means has a frustoconical seating surface which cooperates with said second disc member to provide a line of contact therebetween with said piston means at its limit of motion toward the upper end of said cylinder means.
11. An improved hydraulic control rod actuator for a nuclear reactor, the reactor including a pressure vessel having a fuel assembly disposed therein and means delivering coolant under pressure to the interior of the vessel for circulation through the fuel assembly, the fuel assembly including a plurality of elements containing fissionable fuel and a plurality of neutron absorber elements disposed for movement in guide tubes located in the fuel assembly, the interiors of the guide tubes being exposed to the coolant, the reactor further including means establishing a control pressure less than the normal coolant pressure maintained within the pressure vessel, said control rod actuator comprising: cylinder means located within the pressure vessel, said cylinder means being defined by a tubular member of substantially constant internal cross-sectional area, said cylinder means tubular member being oriented substantially vertically and axially aligned with an absorber element guide tube; an apertured alignment plate connected to the lower end of said cylinder means tubular member, the aperture in said alignment plate being aligned with said cylinder means; tubular sleeve means disposed at least partly within said plate aperture, the upper end of said sleeve means defining an inwardly tapered seating surface; sleeve support means, said support means Being at least partly tubular, at least a portion of the tubular part of said support means extending into and being coaxial with said sleeve means; means for mounting said sleeve means for said support means, said mounting means permitting limited axial movement of said sleeve means; means coupling said sleeve support means to the aligned fuel assembly absorber element guide tube; buffer means positioned at the upper end of said cylinder means, said buffer means having a passage therethrough communicating at a first end with the interior of said cylinder means; piston means positioned for movement within said cylinder means, said piston means having a first extension adapted to pass out of the lower end of said cylinder means through alignment plate aperture and said sleeve means for mechanically connecting said piston means to a neutron absorber element, said piston means having a second extension oppositely disposed from said first extension, said second extension being at least partly tapered and adapted to cooperate with a portion of said buffer means defined passage to gradually terminate flow through said passage as said piston means approaches the upper end of said cylinder means, the combined weight of said piston means and absorber element being sufficient to overcome upwardly directed forces resulting from exposure to the pressurized coolant whereby said piston means will be normally seated on said valve seat defining means; and means for coupling the second end of said buffer means defined passage to the control pressure establishing means whereby a pressure less than the pressure vessel internal coolant pressure may be selectively applied to the interior of said cylinder means to cause upward movement of said piston means.
12. The apparatus of claim 11 wherein said alignment plate defines a valve seat at the side of said aperture disposed away from said cylinder means and wherein said sleeve means comprises: a first portion having an outer diameter smaller than the plate aperture diameter, the first end of said sleeve means first portion having an inwardly tapered surface which defines said cylinder means first end valve seat; and a second portion having an outer diameter which exceeds the plate aperture diameter, the junction of said first and second sleeve means portions defining a spherical surface which cooperates with said alignment plate valve seat to perform a valving action whereby pressure coolant is prevented from entering said cylinder means about the exterior of said sleeve means.
13. The apparatus of claim 12 further comprising: resilient means for urging said sleeve means against said alignment plate.
14. The apparatus of claim 5 wherein said means defining a valve seat at said cylinder means lower end comprises: an apertured alignment plate, an aperture in said plate being aligned with said cylinder means; tubular sleeve means disposed at least partly within said plate aperture, the upper end of said sleeve means defining an inwardly tapered seating surface; sleeve portion means, said support means being at least partly tubular, at least a portion of the tubular part of said support means extending into and being coaxial with said sleeve means; and means for mounting said sleeve means from said support means, said mounting means permitting limited axial movement of said sleeve means.
15. The apparatus of claim 14 wherein said alignment plate defines a valve seat at the side of said aperture disposed away from said cylinder means and wherein said sleeve means comprises: a first portion having an outer diameter smaller than the plate aperture diameter, the first end of said sleeve means first portion having an inwardly tapered surface which defines said cylinder means lower end valve seat; and a second portion having an outer diameter which exceeds the plate aperture diameter, the junction of said first and second sleeve means portions defining a spherical surface whicH cooperates with said alignment plate valve seat to perform a valving action whereby pressure coolant is prevented from entering said cylinder means about the exterior of said sleeve means.
16. The apparatus of claim 15 further comprising: resilient means for urging said sleeve means against said alignment plate.
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