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US 4,915,579 AGranted
Pump sealing apparatus
AssigneeA. R. Wilfley & Sons, Inc.
InventorsJohn D. Whittier, G. Michael Wilfley, Irvin F. Zagar
Life of this patent
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AssigneeA. R. Wilfley & Sons, Inc.
InventorsJohn D. Whittier, G. Michael Wilfley, Irvin F. Zagar
Estimating the term…
A centrifugal pump of the hydraulic sealing type has a novel and improved sealing apparatus for establishing a hydraulic seal and limiting the flow of liquid from a pump casing into a reservoir or seal housing at one end of the pump casing, and a valve assembly in the seal housing has a valve member normally urged into engagement with the seal housing to isolate liquid in the seal housing from the casing when the pump is not in operation. When the pump is activated and brought up to speed, centrifugal force-responsive pivot members are operative to move the valve member away from sealed engagement with the seal housing to establish fluid communication between the seal housing and pump casing. The force-responsive pivot members are fully enclosed so as to be completely isolated from the liquid in the seal housing and yet be capable of operating directly in opposition to the resilient or spring-loaded valve to move the valve away from sealed engagement with the seal housing. An expeller ring at one end of the seal housing limits liquid flow into the seal housing when the pump is stopped and removes any liquid in the reservoir into the pump casing when the pump is started.
In pumping apparatus wherein a centrifugal pump includes a drive shaft, a pump casing and a seal housing in outer spaced surrounding relation to said drive shaft, an impeller at one end of said drive shaft within said casing to discharge fluid introduced via a fluid inlet in said casing through an outlet, and a fluid channel is provided to establish fluid communication between said pump casing and said seal housing when said pump is in operation, the improvement comprising:
In pump sealing apparatus for a centrifugal pump in which a pump casing includes a seal housing in outer spaced surrounding relation to a drive shaft, an impeller on said drive shaft within said casing to discharge liquid introduced through an outlet, expeller means are provided between said impeller and said seal housing to resist liquid flow past said impeller when said pump is in operation, and a fluid channel is provided to establish fluid communication between said expeller means and said seal housing when said pump is in operation, the improvement comprising an expeller ring mounted for rotation on said shaft in a circumferential space between said seal housing and said expeller means, said expeller ring having radially extending vanes disposed in facing relation to said seal housing, and a baffle plate on said seal housing projecting into said circumferential space and into the path of liquid flow between said vanes and said seal housing to discourage the flow of liquid from said pump casing into said seal housing.
In pumping apparatus wherein a centrifugal pump includes a drive shaft, a pump casing including a seal housing in outer spaced surrounding relation to said drive shaft, an impeller at one end of said drive shaft within said casing to discharge liquid introduced into said casing through an outlet and expeller means are provided to limit liquid flow from said impeller into said seal housing when said pump is in operation, and a fluid channel is provided to establish fluid communication between said expeller means and said seal housing when said pump is in operation, the improvement comprising:
Dependencies are inferred from the claim text.