US3850550A — Centrifugal pump and motor

Claim 1

Independent Claim 140 words

A centrifugal pump and motor comprising an impeller and housing means therefor forming an impeller chamber adapted to pump water containing abrasive means, said housing means including a back wear ring, an axial diffuser, a motor in axial alignment with said impeller, a common shaft for the motor rotor and the impeller, tubular means encompassing said motor for the length thereof and connecting to said axial diffuser for flow of pumped liquid therethrough for cooling the motor, an outlet means connecting to said tubular means, means on said outlet means journalling an end of the shaft thereon, and a vortex separator connected to said outlet means to receive part of the pumped material, and means connecting to the vortex separator for flow of its clear liquid output to said chamber adjacent said wear ring for flushing the said wear ring.

Claim 2

Dependent Claim 140 words

A centrifugal pump and motor comprising an impeller and housing means therefor forming an impeller chamber adapted to pump water containing abrasive means, said housing means including a back wear ring, an axial diffuser, a motor in axial alignment with said impeller, a common shaft for the motor rotor and the impeller, tubular means encompassing said motor for the length thereof and connecting to said axial diffuser for flow of pumped liquid therethrough for cooling the motor, an outlet means connecting to said tubular means, means on said outlet means journalling an end of the shaft thereon, and a vortex separator connected to said outlet means to receive part of the pumped material, and means connecting to the vortex separator for flow of its clear liquid output to said chamber adjacent said wear ring for flushing the said wear ring.

Claim 3

Dependent Claim 80 words

A centrifugal pump and motor as in claim 1 where said impeller includes front and rear face shroud means, the flushing liquid flowing outwardly between the rear impeller shroud means and a chamber wall provided on the impeller and housing means, respectively, the impeller having at least one substantially axially directed hole extending therethrough radially offset from the impeller axis to conduct seal flushing liquid to a clearance space provided between the front impeller shroud means and the chamber wall.

Claim 4

Dependent Claim 56 words

A centrifugal pump and motor as in claim 1 and including a closed chamber forming means around said shaft between the pump and the motor, a pair of axially spaced seal means engaging said shaft at opposed ends of the chamber, and a fixed volume of liquid seal lubricant received and substantially filling the closed chamber.

Claim 5

Dependent Claim 50 words

A centrifugal pump and motor as in claim 1 where the motor has an insulating liquid enclosed therein, a pair of bearings engage the motor shaft, and liquid circulation means are formed in the shaft And extend the length of the motor for circulation of such liquid through said bearings.

Claim 6

Dependent Claim 163 words

A self contained centrifugal pump and motor unit comprising an impeller and housing means therefor forming a pump chamber and a pump including an axial diffuser, a motor in axial alignment with said impeller, a common shaft for the motor rotor and the impeller, a tubular means encompassing said motor for the length thereof and connecting to said axial diffuser for flow of pumped liquid therethrough for cooling the motor, an outlet means connecting to said tubular means, means on said outlet means journalling an end of the shaft thereon, means sealing said motor in the pump and motor unit, and characterized by a vortex separator connected to said outlet means to receive part of the pumped material, means connected to said vortex separtor to receive clear liquid output therefrom, which means connect to a rear wall of the pump chamber for supply of clear liquid to the pump chamber to flush the clearance space provided for the impeller in the pump chamber.

Claim 7

Dependent Claim 163 words

A self contained centrifugal pump and motor unit comprising an impeller and housing means therefor forming a pump chamber and a pump including an axial diffuser, a motor in axial alignment with said impeller, a common shaft for the motor rotor and the impeller, a tubular means encompassing said motor for the length thereof and connecting to said axial diffuser for flow of pumped liquid therethrough for cooling the motor, an outlet means connecting to said tubular means, means on said outlet means journalling an end of the shaft thereon, means sealing said motor in the pump and motor unit, and characterized by a vortex separator connected to said outlet means to receive part of the pumped material, means connected to said vortex separtor to receive clear liquid output therefrom, which means connect to a rear wall of the pump chamber for supply of clear liquid to the pump chamber to flush the clearance space provided for the impeller in the pump chamber.

Claim 8

Dependent Claim 78 words

A self contained centrifugal pump and motor unit as in claim 5 where the motor has a lubricating liquid enclosed in its rotor and in its stator, a pair of bearings engage the motor shaft at axially opposed ends of the motor, and liquid circulation means are formed in the shaft and extend the length of the motor for circulation of said liquid through the motor and said bearings, the bearings and motor being within a common enclosure.

Claim 9

Dependent Claim 90 words

A self contained centrifugal pump and motor unit as in claim 5 where said impeller has front and rear face shroud means, and said impeller has a hub engaging said shaft and said impeller and hub have at least one substantially axially directed bore means extending through the impeller and its said shroud means to conduct part of the flushing liquid to a clearance space provided between the front impeller shroud means and the chamber wall for radial outward flow of the flushing liquid along both of said shroud means.

Claim 10

Dependent Claim 102 words

In a centrifugal pump and motor unit comprising an impeller and housing means therefor forming an impeller chamber adapted to pump water containing abrasive means and an inlet in a front wall of the impeller chamber, said housing means including a back wear ring on the back wall of the impeller chamber, a motor in axial alignment with said impeller, and characterized by a seal means engaging said shaft spaced from said impeller chamber but operatively connecting thereto, and means connecting to said unit to supply flushing liquid to said chamber adjacent said wear ring and seal means for flushing the same.

Claim 11

Dependent Claim 102 words

In a centrifugal pump and motor unit comprising an impeller and housing means therefor forming an impeller chamber adapted to pump water containing abrasive means and an inlet in a front wall of the impeller chamber, said housing means including a back wear ring on the back wall of the impeller chamber, a motor in axial alignment with said impeller, and characterized by a seal means engaging said shaft spaced from said impeller chamber but operatively connecting thereto, and means connecting to said unit to supply flushing liquid to said chamber adjacent said wear ring and seal means for flushing the same.

Claim 12

Dependent Claim 58 words

In a centrifugal pump and motor unit as in claim 8 where said impeller includes front and rear face shroud means, the flushing liquid flowing to an enclosure formed around said shaft and connecting to the impeller chamber at the back wall thereof and for flow outwardly between the rear impeller shroud means and the chamber back wall.

Claim 13

Dependent Claim 67 words

In a centrifugal pump and motor unit as in claim 9 where said impeller has a hub engaging said shaft and said impeller and hub have at least one substantially axially directed bore means extending the axial length of the impeller axis to conduct flushing liquid to a clearance space provided between the front impeller shroud means and the chamber wall and offset from the chamber inlet.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-11-25	1978-05-27	1978-11-26	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-11-25	1982-05-27	1982-11-26	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-11-25	1986-05-27	1986-11-26	$7700.00	Window Closed / Lapsed

Centrifugal pump and motor

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