US2482414A - Water pump seal - Google Patents

Description

Sept. 20, 1949- K. B. GILLEISPIE WATER PUMP SEAL Filed July 23. 1948 rim " INVENTOR.

' KEN/V57 5. a/ussp/g @mw/M- Patented Sept. 20, 1949 UNITED, STATES, PATENT "OFFICE 2,482,414 warm rum spar. Kenneth B. Gillespie, Va. Application July .23, 194:, Serial No. 40,392

2 Claims. (Cl. 103-103) This invention relates to improvements in rotary liquid pumps involving shaft sealing means, the primary object of the invention being to provide a novel and superior arrangement of this kind which is more efllcient and longer lasting, by reason of its unusual construction, and by reason of the elimination of the relatively easily destructible and easily'deteriorated rubber sealing means usually found in such pumps.

Other important objects and advantageous features of the invention will be apparent from the following description and the accompanying drawing, wherein, merely for present purpose of illustration. a. specific embodiment of the invention is set forth in detail.

In the drawings:

Figure 1 is a vertical longitudinal section taken through said embodiment.

Figure 2 is an exploded view showing in longitudinal sectional, the shaft components and the sealing disk thereon.

Figure 3 is a left-hand end elevation of the intermediate shaft component, and

Figure 4 is a right-hand end elevation of said intermediate shaft component.

Referring in detail to the drawings, the numeral 5 generally designates the preferably cast iron pump housing, whose open back is closed by a plane plate 5, secured to the rear edge of the housing 5, as by screws 1.

The housing 5 includes the forward tubular part 8 containing a double row ball or roller bearing 9 against an internal shoulder Ill, and maintained in place by a threaded plug ll having the central hole l2 through which the forward shaft section l3 projects.

The forward shaft section l3, as shown in Figure 2, comprises the forward portion ll traversing the bearing 9, and the rearward larger diameter portion l5 defining the thrust shoulder l5 abutting the rear end of the bearing 9. The portion l5 has a round axially extending bore l'l opening at its rear end in a. larger diameter axially extending squared socket l8, opening through the rear end of the portion l5. Behind the internal shoulder III the housing 5 has a diametrically enlarged chamber I9 in which the portion of the forward shaft section l3 extends.

The chamber l0 terminates at its rear end in an annular seat having a plane rearwardly directed face 2|, which seat is in concentrically spaced relation to a bulbous housing portion 22, whose peripheral edges terminate in a bevelled ring portion 23 facing the forward side of the pump rotor or impeller 24.

The pump shaft further comprises the intermediate shaftsection 25, which comprises the forward pin '26 to fit in the bore ll of the forward shaft section l3, the larger squared portion 21 to fit in the squared bore l9, and the further enlarged portion 28 defining the shoulder 29 for abutting the rear end of the forward shaft section l3, when these sections are assembled as shown in Figure 1. Like similar portions of the forward shaft section, the intermediate shaft section 25 has a small diameter bore l1 leading into an enlarged squared bore l9 opening through the rear end of the portion 21, to receive the pin 26 and the squared portion 2l,- and'abut the shoulder 29 on the forward end of the portion 29' of the rear shaft section 30.

The rear shaft .section 30 terminates in a rounded axial projection tl. supportably turning in a conforming recess 32 in the forward face of the housing backplate 6.

The vaned rotor or impeller 24 is mounted concentrically in the portion 28 of the rear shaft section 30 and fixed in position thereon by arotor hub 34 and through a transverse bore 35 in the portion 28', the rotor having a conformably bevelled part 36 running close to the pump housing bevelled part 23.

longitudinally slidably mounted on the portion 28 of the intermediate shaft section 25 is the seal, generally designated 31, which is constantly urged toward engagement with the face 2| of the seat 20 by an expanding helical spring 38, circumposed on the shaft sections 25 and 3|! and compressed between the rotor hub 34 and the seal 31. The'seal 31 comprises a relatively thick carbon ring or disk 39, having its rear side cemented or otherwise suitably secured in a shallow cup-like metal disk lll, which is engaged by the forward end of the spring 38. The spring 39 keeps the carbon ring 39 constantly against the face 2| of the seat 20, in a manner to provide anti-friction contact therewith and uid forwardly past wardly along the pump shaft.

What is claimed is:

pin 33 extending the 1. A rotary pump for liquid, comprising a pump housing having a back plate formed with a bearand a tubular part containing an axial anti-friction bearing aligned with said bearing ing recess,

recess, said tubular part terminating at'its rearward end in an annular seat, a pump shaft journaled in said anti-friction bearing and extending rearwardly through said annular seat with its rearward end supportably engaged in said bearing recess, a vaned impeller fixed on said shaft to the to preclude leakage of liq- I the seat 20 as well as for.-,'

rear of said annular seat. a seal on said shaft adjacent to said seat, spring means on said shaft between said impeller and said seal and maintaining said seal engaged with said seat, said shaft comprising forward, intermediate and rearward sections, with said seal mounted on said intermediate section, said back plate being removable, means separably connecting and providing positive axial alignment and non-rotary assembly of said shaft sections, whereby upon removal of said back plate said rear shaft section can be-disconnected from said intermediate shaft section to provide access for removing and reinstalling said spring means and said seal on said intermediate shaft section.

2. A rotary pump for liquid, comprisingapump housing having a back plate formed with a bearing recess, and a tubular part containing an axial anti-friction bearing aligned with said bearing recess, said tubular part terminating at its rearward end in an annular seat, a pump shaft journaled in said anti-friction bearing and extendin rearwardly through said annular seat with its rearward end suppbrta-bly engaged in said bearing recess, a vaned impeller fixed on said shaft to the rear of said annular seat, a seal on said shaft adjacent to said seat, spring means on said shaft 4 between said impeller and said seal and main- Number taining said seal engaged with said seat, said shaft comprising forward, intermediate and rearward sections, with said seal mounted on said intermediate section, said back plate being removable, means separably connecting. and providing positive axial alignment and non-rotary assembly of said shaft sections, whereby upon removal of said back plate said rear shaft section can be disconnected from said intermediate shaft section to provide access for removing and re-installing said spring means and said seal on said intermediate shaft section, and whereby said intermediate shaft section including said seal can be disconnected from said forward shaft section and removed as aunit from said pump housing.

B. GILLESPIE.

file of this patent:

UNITED STATES PATENTS Name Date 1,897,280 Bchwitzer et a1. Feb. 14, 1933 2,249,930 Bailey et al; July 22, 1941

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