US2277210A - Peripheral pump - Google Patents

Description

R. V. COOK PERIPHERALPUMP Filed Feb. 26, 1940 March 24, 1942.

INVEINTORI. g

ROBERT V. COOK BY @wvzlwat/ ATTORNEY.

; Patented M51. 24, 1942 UNITED STATE s PATENT .OFFlCE PERIPHERAL PUMP Robert V. Cook, Chicago, 111., as slgnor to Fairbanks, Morse & Co., Chicago, 111,, a corporation of Illinois ,Application February 26, 1940, Serial No. 320,734

10 Claims.

sitating any disassembly of the remainder of the pump assembly.

The principal object of the invention then resides in the provision of improved sealing means for the purpose indicated, characterized by coacting, substantially cylindrical seal plugs, each having a shouldered end, the plugs being non-rotatably seated in transverse recesses formed in the pump casing between the inlet and discharge passages. thereof, and being arranged in opposed relation such that the shouldered ends abut and cooperate to form a groove or slot closely receiving the peripheral portion of the impeller.

Another object resides in the provision of improved impeller seal plugs arranged in cooperating, opposed relation transversely of the pump casing and on opposite'sides of the impeller, such that the plugs may be readily and easily assembled to or removed from the casing without disturbing the remainder of the pump assembly.

'A further object appears in the provision of renewable seal plugs for the purpose indicated, of improved construction and so mounted in the pump casing as to facilitate assembly and adjustment thereof, to provide a more efiective and efilcient impeller sealing function of the plugs rela-'- tive to the pump impeller, than has been ob tained heretofore.

Further objects and advantages will appear as the following description proceeds and when taken in connection with the accompanying dra-w-' ing, in which:

Fig. i is an assembly elevation of a peripheral type pump incorporating impeller seal plugs according to the present invention, a portion of the pump casing being broken away to reveal the seal plug assembly, partly sectioned as shown; and Fig. 2 is a greatly enlarged, fragmentary section transversely of the pump casing, showing the preferred type of impeller-seal means in operative position, the view being taken along line 22 of Fig. l.

Referring to the drawing by suitable characters of reference, the peripheral pump assembly illustrated, includes a casing section it? provided with a mounting standard H and an upper L-shaped extension l2 providing fluid inlet and discharge passages later to be indicated, and a'complementary' casing section I3 removably secured to the section. H) as by suitable bolts or cap, screws Id. The casing sections in assembly, provide an annular impeller chamber or channel, as indicated at 85, in which rotates the bladed peripheral portion l6 of a disc type impeller or pump rotor 51; The impeller is secured by a suitable key i8, upon the inner end of a pump shaft is,

, the shaft being suitably journalled (not shown) in the casing section it and projecting outwardly thereof (not shown) for coupling to a pump operating motor or other prime mover.

As appears in Fig, 1, the portion 20 of the easing extension 92, provides a fluid inlet passage 2! in communication with the pump chamber 55 and the impeller therein, while. the extension portion 22 provides a fluid outlet or discharge pas.- sage ,23 for the casing chamber 55. The two passages are separated by a dividing wall 25,

preferably formed integrally with the casing structure, the dividing wall being extended into 7 the impeller channel 55 to provide a transverse barrier therein, with the lower end 25 of the wall overlying the impeller periphery, as shown in Fig. 1.

In order to prevent an undesirable by-pess movement of fluid from the discharge passage to the inlet or suction passage of the pump, be-

tween the impeller periphery and the lower end I 25 of the barrier or bridge 25, the prevailing practice has been to employ a separate sealing means at the bridge zone, having a minimum clearance with the impeller periphery. However, such sealing members as have been utilized'heretoiore for this purpose, have not been accessible for adjustment, repair or replacement without necessitating disassembly of the pump casing.-

Accordingly, in keeping with the purposes hereinbefore stated, the arrangement provides a markedly eilective sealing means so arranged in the pump assembly as to be fully accessible from the exterior of the pump casing, thus avoiding the objections noted hereinabove.

Fig. 2 illustrates the preferred form and arrangement of sealing means according to the present invention, located in the zone of the bridge 25 as shown in Fig, 1. Formed on the casing in is an external lateral boss 28, and extending laterally through the boss and casing is an aperture or bore 21. The casing portion of the bore is smooth-walled for the reception of a cylindrical seal member or plug 28,. while the portion of the bore in the boss 23 is internally threaded to receive a threaded set screw 33, the inner end 33 of which normally abuts the plug 28. The casing section I 3 is similarly externally bossed, as at 3|, and is provided with a like bore 32 adapted for the reception oi a second plug 33 and set screw 33, the casing bores 21, 32 and seal- plugs 33, 33 being in axial register in the pump assembly, as shown in Fig. 2. The inner opposed ends of the plugs 23 and 33 are formed to provide shouldered recesses, as at 33 and 33 respectively, which in the assembly abutment 01' abutting ends may be dressed down and the recesses 33 and 33 machined so that the desired rotor clearance will be again established.

The foregoing description of an improved type of sealing means adapted for application to a peripheral pump, relates to a single preferred embodiment thereof, and it is to be understood that the present sealing means is susceptible of various structural and assembly modifications withthe plugs as shown in Fig. 2, cooperate to provide a recess or groove 31 to receive or embrace the peripheral, fluid-impelling portion of the pump impeller. The plug recesses 35 and 33 may be accurately milled and machined to provide for the desired minimum operating clearance or running seal for the impeller. As appears in Fig, 1, the lateral aperturing o! the casing sections to receive the seal plugs, is effected in the zone of the bridge 23, such that the lower end 25 of the bridge is thereby cut away in arcuate form, as at 33, to accommodate the projecting shoulders 39 of the seal plugs (Fig. 2) so that these shoulders may abut in assembly, in overlying relation to a definite, limited arc of the impeller periphery. The assembly abutment oi. the plug shoulders 33 then determines the sealing position of the plugs relative to the impeller, such as to maintain the miniminn operating clearance or running seal therewith. The plugs are retained in such position by the set screws 23 and 33, and the latter are held or locked in adjustment. each by a lock nut 43 which in the present example, may be formed toprovide an enclosing cap 4|. A suitable gasketing washer 32 may be provided as shown, to preclude fluid leakage at the juncture of the cap and casing.

To assure proper seating of each plug and further, to prevent rotational displacement thereof.

in the casing hore, key-ways and 43 are formed in the plug and easing respectively, to receive a key element 43.

Thus while prevented from turning by reasonof the keys 45, the plugs may be readily displaced in the axial direction, as for face of the impeller, provides for readyinser- Y operable in said channel, and fluid sealing means in the zone of saidchannel between said passages, said means comprising laterally adjustable cooperating elements carried by the casing and close embracing the periphery of the rotor in said 0 el zone.

2. In a fluid pump of the general type described, a casing providing an annular fluid channel and inlet and outlet passages communicating therewith, a rotor member of peripheral fluid-impelling type. operable in said channeL-a partition separating said passages and projecting into said channel, to overlie said rotor,- said casing being apertured laterally therethrough in the zone of said partition,- and cdoperating fluid sealing elements seated in said aperture, said elements closely overlying the rotor periphery and extending closely adjacent the, opposite lateral faces of the rotor in the peripheral zone thereof.

3. In a fluid pump of the general type described, a casing providing an annular fluid tion and assembly seating of the plugs after assembly of the pump, and thereby enables adjustment of the plugs from the exterior of the casing, through the set screws 29 and 33 as rendered accessible upon removal of the capsign of wear or erosion in the pumping channel appears at the bridgeor partition portion 23, for at this point the fluid mass must be diverted into the outlet e 23, and eiiectively prevented from passing on into the inlet side of the pump. Therefore, the sealing means at this point or zone must be capable of ready adjustment as to operating clearance. The plug type of sealing means above described is well adapted for this purpose, since in the presently improved arrangement thereof, they may be readily adjusted or removed and replaced without disturbing or requiring disassembly of, the remainder of the pump. And since the plugs are small and inexpensive, they may be discarded ii badly eroded,

and new ones inserted, or it slightly worn, the

channeland inlet and discharge passages communicating therewith, a pump rotor of peripheral fluid impelling type, operable in said channel, a partition separating said passages and extending into said channel in overlying relation to said rotor, said casing being apertured laterally therethrough in the zone or said partition, opposed fluid sealing elements removably seated in said aperture on each side of said rotor, said elements closely embracing the rotor periphery in the zone of said partition, and means for retaining said elements in position in said aperture. I

4. In a fluid pump of the general type described, a casing providing an annular channel and adjacent inlet and discharge passages communicating therewith, a pump rotor of peripheral fluid impelling type, operable in said channel, said casing being apertured transversely therethrough in the zone of the channel between said pes, opposed fluid sealing elements seated in said aperture, the inner opposed ends of said elements closely embracing the rotor periphery in said channel zone, and means for retaining said elements inposition in said aperture, said elements and retaining means being accessible from the exterior of said casing. 5. In a fluid pump of the general type described, a casing providing an annular fluid channel and adjacent inlet and discharge passages in communication therewith, a pump rotor oi. peripheral fluid-impelling type, operable in saidchannel, said casing being apertured transversely therethrough in the zone of the channel between said passages, fluid sealing elements seated in said aperture on'opposite sides of said channel, the inner opposed ends of said elements ture for retaining said elements in position there.-

in, said elements and retaining means being accessible mm the exterior of said casing.

6. In a pump of the general type described, a casing provided with a displacement channel along its interior periphery, an impeller having a displacing portion operable in said channel, the casing being formed to provide spaced inlet and discharge ports and conduits, a sealing element in the casing, between the zones of the ports, the sealing element being displaceable in a direction transverse to the impeller, and formed on its inner end to constitute a running'seal with one side and the rim of the impeller, and a cooperating abutment portion carried by the casing and coactingwith the sealing element.

7. In a pump of the general type described. a

casing provided with a displacement channelner end to constitute a running seal with one side and the rim of the impeller, and a second.

companion sealing element, adjustable to and from the impeller rim, carried by the casing and coacting with the sealing element.

8. In a pump of the general type described, a casing provided with a displacement channel along its interior periphery. an impeller having a displacing portion operable in said channel, the casing being formed to provide spaced inlet and in the casing, betweenthe zones of the ports, the sealing element being displaceable in a direction transverse to the impeller, screw threaded means for displacing the said sealing element, said sealing element being formed on its inner end to constitute a running seal with one side and the rim of the impeller, a cooperating abutment portion carried by the casing and coacting with the sealing element, and means for preventing rotational displacement of the sealing element.

9. In a pump of the general type described, a casing provided with a displacement channel along its interior periphery, an impeller having a displacing portion operable in said channel, the casing being formed to provide'spaced inlet and outlet, ports and conduits, a sealing element in the casing, between the zones of the ports, the sealing element being displaceable in a direction transverse to the impeller, screw threaded means for displacing the sealing element, said screw threaded means being accessible from the exterior of the casing, a sealing cap constituting a cover overlying the screw threaded means, said discharge ports and conduits, a sealing element sealing element being formed on its inner end to constitute a running seal with one side and the rim of the impeller, and a cooperating abutment portion carried by the casing and coacting with ment to and from the impeller in a direction parallel to the impeller axis, the said plug having an arcuately undercut portion near its inner end, adapted to constitute a running seal with one side and the outer edge of the impeller rim.

' ROBERT V. COOK.

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