Pumps – Motor driven – Electric or magnetic motor
Reissue Patent
1996-02-22
2001-06-19
Freay, Charles G. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S423110, C417S423120, C417S423140
Reissue Patent
active
RE037233
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention pertains to a centrifugal pump which in its conventional form comprises an impeller fitted with vanes and rotating in a closed casing. Fluid enters the casing at the center of the impeller where, due to the rotation of the impeller, the pressure of the fluid is increased and the fluid is delivered to the periphery at a high velocity. Rotation of the impeller is activated by an external electric motor shaft penetrating into the closed casing (volute) onto which the impeller is attached.
2. Description of the Related Art
U.S. Pat. No. 3,134,332, Nielson 1964, describes a conventional centrifugal pump with an electric motor driving the impeller. U.S. Pat. No. 4,773,822 Jensen et al 1988, describes the separation between the rotating impeller inlet and the volute supply inlet allowing a certain percentage of the pumped fluid to reenter the impeller suction inlet. U.S. Pat. No. 4,773,823, Pease 1988, describes the complexity of included parts in a conventional motor driven pump.
SUMMARY OF THE INVENTION
The present art of electromotive centrifugal pumping has historically required a separation between the rotating centrifugal impeller inlet and the stationary volute supply inlet. The resultant pressurized fluid effectively transits through the separation between the volute and the impeller suction inlet. The separation allows a certain percentage of the pumped media to reenter the impeller suction supply inlet. The resultant recirculation requires the application of additional electrical energy to repressurize the aforementioned recirculating media. The resultant recirculation may also wear the surfaces of either the impeller inlet and/or the volute supply inlet. This wearing process decreases the efficiency of the pump proportionally with the increased separation of the impeller inlet and the volute supply inlet. In certain pumping situations, i.e., sewage, pulp, trash pumping, etc., the recirculating media may carry suspended solids. These solids complicate the pumping process when they become wedged between the rotating impeller inlet and the stationary volute. The efficiency of the pump decreases when the wedged suspended solids causes impeller cavitation and/or friction. The wedged suspended solids could effectively disable the pump or even stop the rotation of the impeller. Damage may result to either the electromotor, the impeller or the volute intake. Depending upon the impeller, volute or pump assembly the removal of these solids from the pump could be dangerous, labor intensive or expensive.
Furthermore, electromotive centrifugal pumping has encumbered design configurations of the drive motor to be an external appendage in relation to the impeller and volute. Centrifugal pump impellers are usually driven by the electromotor shaft or pump bearing and alignment shaft intruding into the volute cavity. The impeller is usually tapped and screwed to the shaft or bolted on the shaft in some fashion. This and similar design configurations also encumber the assembly design to unnecessary parts and complexity.
It is an objective of this invention to provide an improved electromotive pump and impeller assembly. It is a more particular objective to provide in a centrifugal pump a unique means of preventing the inherent recirculation an associated problems of conventional pump assemblies. The present invention in the proposed configuration eliminates a number of parts, tooling processes and associated manufacturing cost. A reduction in the number of unnecessary component parts effectively reduces the complexity, weight and size of the invention. Therefore, the necessary manufacturing, assembly and service procedures are effectively reduced. For clarification, the improvements encompass a combined rotating impeller intake -and power transmitting shaft integral with a new totally sealed water design. The hollow impeller shaft serves the dual purpose of transmitting motor rotational power to the enclosed impeller blades and serves as the impeller fluid intake conduit. This arrangement effectively eliminates the necessity of a volute intake, adjustable impeller/volute clearance tolerances and the industry standard wearing rings for enclosed impeller pumps. This present invention efficiently transmits the motor power directly to the impeller blades. This configuration completely eliminates the inherent recirculation problems associated with conventional present art centrifugal pumps. It also enhances the radial thrust bearing curve thereby dramatically increasing service life and range of the pump and impeller applications. This arrangement implements a new ease of impeller access for inspection purposes and new ease of changing the impeller unit. This present invention incorporates optional changeable impeller leading edge blades.
REFERENCES:
patent: 1363315 (1920-12-01), Dron
patent: 1687658 (1928-10-01), Conant
patent: 1714484 (1929-05-01), Johnson
patent: 2139379 (1938-12-01), Myers
patent: 3134333 (1964-05-01), Nielsen
patent: 3667870 (1972-06-01), Yoshida et al.
patent: 4569638 (1986-02-01), Harker et al.
patent: 4773822 (1988-09-01), Jensen et al.
patent: 4773823 (1988-09-01), Pease
patent: 4959183 (1990-09-01), Jameson
patent: 5112202 (1992-05-01), Oshima et al.
patent: 733312 (1966-05-01), None
patent: 343016 (1960-01-01), None
patent: 1059329 (1954-04-01), None
patent: 72270 (1981-06-01), None
patent: 0072270 (1981-06-01), None
Chancellor Dennis H.
Chancellor Temple M.
Vogel Jacquetta
Fish Robert D.
Fish & Associates, LLP
Freay Charles G.
Nate International
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