Transformer oil pump bearing material
First Claim
Patent Images
1. Electrical apparatus comprising:
- a tank;
a liquid dielectric disposed in said tank;
a motor-pump unit for circulating said liquid dielectric within said tank, said motor-pump unit including a housing having a motor portion and a pump portion;
a rotatable metallic shaft extending between said motor portion and said pump portion;
first and second sleeve bearings mounting said shaft for rotation in said housing;
said motor portion and first and second sleeve bearings being in fluid communication with said light dielectric, to cool and lubricate said motor portion and said first and second sleeve bearings;
said bearings each having a sleeve surface disposed radially adjacent to and in near contact with the periphery of said shaft, said bearings being comprised of non-electrically conductive material including a polyamide-imide resin and a filler consisting of about 3% of titanium trioxide.
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Accused Products
Abstract
Fluid-cooled electrical apparatus characterized by a new and improved pump for circulating the fluid within the apparatus. The pump has a motor portion in fluid communication with a pump portion, non-electrically conductive bearings supporting a common shaft between the two portions. The bearings being comprised of a polyamideimide thermoplastic resin.
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Citations
6 Claims
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1. Electrical apparatus comprising:
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a tank; a liquid dielectric disposed in said tank; a motor-pump unit for circulating said liquid dielectric within said tank, said motor-pump unit including a housing having a motor portion and a pump portion; a rotatable metallic shaft extending between said motor portion and said pump portion; first and second sleeve bearings mounting said shaft for rotation in said housing; said motor portion and first and second sleeve bearings being in fluid communication with said light dielectric, to cool and lubricate said motor portion and said first and second sleeve bearings; said bearings each having a sleeve surface disposed radially adjacent to and in near contact with the periphery of said shaft, said bearings being comprised of non-electrically conductive material including a polyamide-imide resin and a filler consisting of about 3% of titanium trioxide. - View Dependent Claims (2)
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3. A motor pump for circulating a fluid comprising:
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a housing having a motor portion and a pump portion; a rotatable shaft extending between the motor portion and the pump portion; sleeve bearings mounting the shaft for rotation in the housing; said motor portion and sleeve bearings being in fluid communication with a fluid circulated by the pump portion, to thereby lubricate and cool the motor portion and sleeve bearings; the sleeve bearing comprising a polyamide-imide resin and a filler system consisting of about 3% of titanium trioxide and having resistance to elevated temperatures up to about 500°
F.; andthe sleeve bearing also being characterized by a coefficient of thermal expansion of about 3.6×
10-5 cm/°
C. and by a coefficient of friction of about 0.2 against 1018 carbon steel. - View Dependent Claims (4, 5)
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6. A motor pump for circulating a fluid within electrical apparatus comprising:
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a housing having a motor portion and a pump portion; a rotatable shaft extending between the motor portion and the pump portion; sleeve bearings mounting the shaft for rotation in the housing; the motor portion of the housing and said sleeve bearings, being in fluid communication with a fluid circulated by the pump portion, to thereby lubricate and cool the motor portion and the sleeve bearing comprising a polyamide-imide resin and a filler consisting of about 3% of titanium trioxide and having resistance to elevated temperatures up to about 500°
F., andthe sleeve bearing also being characterized by a coefficient of thermal expansion of about 3.6×
10-5 cm/°
C. and by a coefficient of friction of about 0.2 against 1018 carbon steel.
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Specification
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Current AssigneeABB Power T&D Co Inc (ABB Limited)
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Original AssigneeWestinghouse Electric Corporation (Paramount Global (f/k/a ViacomCBS Inc.))
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InventorsPetrie, Edward M., Bell, Clifford J.
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Primary Examiner(s)Gluck, Richard E.
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Assistant Examiner(s)Cuomo, Peter M.
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Application NumberUS06/310,569Time in Patent Office2,191 DaysField of Search308/DIG. 8, 308/DIG. 14, 384/297, 384/378, 417/370, 417/369US Class Current417/370CPC Class CodesF04D 29/026 especially adapted for liqu...F04D 29/0413 hydrostatic; hydrodynamic t...F04D 29/047 hydrostatic; hydrodynamicF05D 2300/133 TitaniumF05D 2300/21 Oxide ceramicsF05D 2300/433 Polyamides, e.g. NYLONF05D 2300/615 FillerY10S 384/905 Temperature compensationY10S 384/907 Bearing material or solid l...
