A pump assembly includes a centrifugal pump having an intake, a discharge, a pump chamber and an impeller to deliver water from the intake to the discharge. A priming system is fluidly coupled to the pump chamber. A drive assembly includes a drive shaft coupled to the priming system and positioned a
A pump assembly includes a centrifugal pump having an intake, a discharge, a pump chamber and an impeller to deliver water from the intake to the discharge. A priming system is fluidly coupled to the pump chamber. A drive assembly includes a drive shaft coupled to the priming system and positioned around an impeller shaft coupled to the impeller for selective rotatable coupling of the impeller shaft and the drive shaft.
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1. A pump assembly, comprising: a centrifugal pump having an intake, a discharge, a pump chamber, and an impeller disposed within the pump chamber;a priming system including a passageway fluidly coupled to the pump chamber, two piston assemblies and an air outlet; anda drive assembly including an im
1. A pump assembly, comprising: a centrifugal pump having an intake, a discharge, a pump chamber, and an impeller disposed within the pump chamber;a priming system including a passageway fluidly coupled to the pump chamber, two piston assemblies and an air outlet; anda drive assembly including an impeller shaft coupled to the impeller, a drive shaft coupled to the priming system and a clutch assembly coupled to the impeller shaft, the clutch assembly configured to selectively rotationally couple the drive shaft and the impeller shaft, wherein the drive shaft is coaxial with and surrounds the impeller shaft, wherein the two piston assemblies are positioned on opposite sides of the drive shaft and the drive shaft includes an eccentric portion engaging the piston assemblies to provide reciprocating motion of the piston assemblies upon rotation of the drive shaft. 2. The pump assembly of claim 1 wherein each piston assembly includes a piston head movable with respect to a piston cover, each respective piston head being directly connected to the other piston head such that the piston heads move together. 3. The pump assembly of claim 2, further comprising a planetary drive surrounding the eccentric portion and positioned between the two piston assemblies and the eccentric portion. 4. The pump assembly of claim 2, further comprising a block coupled to one of the two piston assemblies and a compression spring positioned between the block and said one piston assembly, the block positioned to contact the eccentric portion of the drive shaft during rotation of the drive shaft. 5. The pump assembly of claim 2 wherein an exit flow path through each piston assembly is on a single side of the respective piston head. 6. The pump assembly of claim 1 wherein the priming system includes a priming valve fluidly coupled to the passageway and a conduit fluidly coupled to the piston assemblies, the priming valve operable between an open configuration, wherein the passageway is fluidly coupled to the conduit, and a closed configuration, wherein the passageway is fluidly isolated from the conduit. 7. The pump assembly of claim 6 and further comprising an auxiliary valve selectively fluidly coupleable to atmosphere and fluidly coupled to the conduit, where in the priming system is operable to remove water from the priming system while the auxiliary valve is fluidly coupled to atmosphere. 8. The pump assembly of claim 1 and further comprising a pressure sensor coupled to the pump, the pressure sensor providing a signal indicative of the pump being primed. 9. The pump assembly of claim 1 and further comprising a first sensor providing a signal indicative of a rotational speed of the drive shaft and a second sensor providing a signal indicative of a rotational speed of the impeller shaft. 10. The pump assembly of claim 9 and further comprising a control system coupled to the first sensor and the second sensor, the control system monitoring relative speeds of the drive shaft and the impeller shaft during priming of the centrifugal pump and configured to disengage the clutch assembly if the drive shaft is rotating at a different speed than the impeller shaft. 11. The pump assembly of claim 1 and further comprising a purge system configured to remove water from the priming system using at least one of a purge valve and compressed air. 12. The pump assembly of claim 1, wherein the centrifugal pump includes a volute housing defining an elongate aperture and a cutwater formed of a replaceable reinforcement element positioned in the aperture. 13. The pump assembly of claim 1, wherein the centrifugal pump includes a volute housing defining a passageway and a drain port, the drain port having a leading edge substantially perpendicular to a direction of water flow in the passageway and a trailing edge tapered at an angle with respect to the direction of water flow. 14. The pump assembly of claim 13, wherein the drain port further includes an outlet and an elongated opening positioned between the passageway and the outlet, wherein the elongate opening has a smaller width than the outlet when viewed in cross section in a direction perpendicular to the water flow. 15. A method of priming a centrifugal pump, comprising: providing a drive assembly including an impeller shaft, a drive shaft and a clutch assembly, the drive shaft being coaxial with the impeller shaft;positioning two piston assemblies on opposite sides of the drive shaft, the drive shaft including an eccentric portion engaging the piston assemblies to provide reciprocating motion of the piston assemblies upon rotation of the drive shaft;rotating the impeller shaft;engaging the clutch assembly such that the drive shaft rotates with and surrounds the impeller shaft; andoperating a primary system coupled with the drive shaft to remove air from the centrifugal pump. 16. The method of claim 15, further comprising: connecting the two pistons assemblies together with at least one rod such that the two piston assemblies move together as the drive shaft rotates. 17. The method of claim 15, further comprising: operating a priming valve to fluidly couple a pump chamber of the centrifugal pump with the priming system. 18. The method of claim 15, further comprising: monitoring relative speed of rotation of the impeller shaft and the drive shaft; anddisengaging the clutch assembly based on the monitoring. 19. A pump assembly, comprising: a centrifugal pump having an intake, a discharge, a pump chamber, a volute housing and an impeller disposed within the pump chamber, the volute housing defining a passageway and a drain port, the drain port further including an outlet and an elongated opening positioned between the passageway and the outlet, wherein the elongated opening has a smaller width than the outlet when viewed in cross section in a direction perpendicular to the water flow;a priming system including a passageway fluidly coupled to the pump chamber and an air outlet; anda drive assembly including an impeller shaft coupled to the impeller, a drive shaft coupled to the priming system and a clutch assembly coupled to the impeller shaft, the clutch assembly configured to selectively rotationally couple the drive shaft and the impeller shaft. 20. A pump assembly, comprising: a centrifugal pump having an intake, a discharge, a pump chamber, and an impeller disposed within the pump chamber;a priming system including a passageway fluidly coupled to the pump chamber, a priming valve fluidly coupled to the passageway and a conduit fluidly coupled with an air outlet, the priming valve operable between an open configuration, wherein the passageway is fluidly coupled to the conduit and a closed configuration, wherein the passageway is fluidly isolated from the conduit;a drive assembly including an impeller shaft coupled to the impeller, a drive shaft coupled to the priming system and a clutch assembly coupled to the impeller shaft, the clutch assembly configured to selectively rotationally couple the drive shaft and the impeller shaft;a control system operable to transition the priming valve between the open and closed configurations; anda first sensor providing a signal indicative of a rotational speed of the drive shaft and a second sensor providing a signal indicative of a rotational speed of the impeller shaft, wherein the control system is configured to receive signals from the first sensor and the second sensor and transition the priming valve between the open and closed configurations as a function of the received signals.
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이 특허에 인용된 특허 (12)
Peterson Reuben E. (Fergus Falls MN), Apparatus for automatically water charging a centrifugal fire pump.
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