Impeller Attachment Method

Inactive Publication Date: 2012-07-26
ITT MFG ENTERPRISES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025]One advantage of the present invention is that the impeller may disengage in as few as about 3-5 turns of the shaft, as opposed to having to travel the entire length of the thread of the shaft / impeller. Axial movement before disengaging is approximately 1 inch. Experimentation has also indicated that, even when there is misalignment of the impeller and shaft angularly and longitudinally, the threads have typically engaged and aligned the impeller to the shaft.

Problems solved by technology

While inexpensive, this method of attachment presents several difficulties for maintenance personnel, including alignment requirements to start threads that are difficult to maintain in field conditions (large, heavy parts must be aligned precisely with inadequate lifting equipment), the tendency of standard thread forms to cross thread if slightly misaligned, and the large number of turns required to seat the shaft threads in the impeller.

Method used

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Examples

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Embodiment Construction

[0032]FIG. 1 shows the basic invention in the form of apparatus such as an assembly, arrangement or combination that includes a shaft 10 having an end 10a with tapered threads 12 coupled to an impeller 14 having a bore 14a with corresponding tapered impeller threads 16 formed therein, according to some embodiments of the present invention. The impeller shaft 10 and the impeller 14 form part of apparatus, such as a pump assembly, arrangement or combination consistent with that shown in FIGS. 2-3 herein. As shown, the impeller shaft 10 is coupled directly to the impeller 14 so that the tapered threads 12 of the shaft 10 rotationally mate and frictionally engage the corresponding tapered impeller threads 16 of the impeller 14 to transmit torque directly through the tapered threads 12, and to provide self alignment even if the coupling of the tapered threads 12 and the impeller tapered threads 16 of the tapered bore 14a start out of alignment. The tapered thread configuration substantia...

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Abstract

A pump is provided having an impeller in combination with a power transmission shaft. The impeller has a tapered bore with impeller threads. The power transmission shaft has a shaft end with tapered threads configured to couple directly to the impeller threads of the tapered bore of the impeller, to transmit torque directly through the tapered threads, and to provide self axial or radial alignment even if the coupling of the tapered threads and the impeller threads of the tapered bore start out of alignment. The tapered thread configuration substantially reduces investment in lifting equipment and time by maintenance personnel because it eliminates the need for maintenance personnel to precisely align the impeller threads and the tapered threads before attaching or removing the impeller and the tapered threads release much more quickly from the impeller than a standard thread configuration, reducing the number of turns the power transmission shaft must be rotated by hand to free it from the impeller.

Description

CROSS REFERENCE TO RELATED PATENT APPLICATION[0001]This application claims benefit to patent application Ser. No. 61 / 365,947, filed 20 Jul. 2010, which is hereby incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to a pump; and more particularly relates to a new technique for attaching an impeller to a shaft in a pump, including a centrifugal pump or a slurry-type pump.[0004]2. Description of Related Art[0005]Current pump designs use straight (cylindrical) threads of various forms to attach an impeller to a power transmission shaft in a pump. While inexpensive, this method of attachment presents several difficulties for maintenance personnel, including alignment requirements to start threads that are difficult to maintain in field conditions (large, heavy parts must be aligned precisely with inadequate lifting equipment), the tendency of standard thread forms to cross thread if slightly misaligned, and the...

Claims

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Application Information

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IPC IPC(8): F01D5/30
CPCF04D29/20F04D7/04F04D29/628
InventorPADDOCK, DOUGLAS
OwnerITT MFG ENTERPRISES LLC