Dry running flexible impeller pump and method of manufacture

Details Dry running flexible impeller pump and method of manufacture Dry running flexible impeller pump and method of manufacture

2011-01-11

2011-01-11

Wiehe, Nathaniel (Department: 3745)

Rotary kinetic fluid motors or pumps

Resilient or movably mounted blade portion or axially...

Yieldingly or pivotedly mounted or flexible blade

C415S200000, C415S216100, C415S217100, C416S24100B

Reexamination Certificate

active

07866942

ABSTRACT:
This invention relates to a Dry Running Flexible Impeller Pump and Method of Manufacture that is specifically designed to provide a flexible impeller pump that is capable of being run dry for extended periods of time without damaging the impeller. The pump's housing and end plates are coated with a low friction industrial coating to limit the heat of friction created by the flexible impeller while in use. Additionally the flexible impeller is cast from a pre-molding silicone substrate that contains no mold release and is cast in a mold that is treated with a low friction industrial coating and is cast without mold release. Once the flexible impeller is removed from the mold it is cleaned with alcohol, baked in a vacuum at a temperature of at least 100° C., and then coated with a Paralene N coating by vacuum deposition.

REFERENCES:
patent: 2455194 (1948-11-01), Rumsey
patent: 2902935 (1959-09-01), Dinnison et al.
patent: 3059583 (1962-10-01), Huber
patent: 3829248 (1974-08-01), Bright et al.
patent: 5449280 (1995-09-01), Maki et al.
patent: 5638600 (1997-06-01), Rao et al.

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