US1740475A - Pump - Google Patents

Description

Dec.-24, 1929. c, MURDOQH 1,749,475

PUMP

Filed March 16. 1,926 2 Sheets-Sheet 2 40 v.- I H423 "IHIIHI 11v VENTOR. Mar/e3 4 Maniac/7 ATTORNEYS.

Patented; Dec. 24, 1929 sra'res UEARLEfi A. MUBDOCH, NEW YQM, It. 1?.

Application filed March 16, race. Serial No. 95,019.

This invention relates to a ump of the type which includes a rotary impe ler. It is an object of the invention to provide a pump in which the rotary impeller is supported at one side, and to so construct the pump and its bearing that leakage through the hearing will be prevented.

It is a further object 'of the invention to so house the impeller that the fluid will pass to.

m the impeller in substantially the same line that it passes from the impeller, thus reducing the friction.

In the drawings: Figure 1 is a sectional View of a pump constructed in accordance with my invention;

Figures 2, 3, 4, 5, 6 and 7, are details of the elements which 0 to make up the bearing for the rotor sha t;

Figure 8 is a face view of the pump;

Figures 9 and 10 are sectional views of a modification.

Referring particularly to the construction shown in Figure 1 of the drawings, the pump casing l, which is attached to the casing" from which the fluid is supplied, such for instance as a washing machine such as shown in my copending application Serial Number 704,905, is provided with a housing 2 for the bearing of the shaft of the rotor. 'llhis housing 1 has an inlet opening 3 for the fluid which is coextensive with the rotor and through which the rotor may be inserted into the housing. The rotor, which includes a series of impeller blades 4, is mounted within the casing l, and is adapted to discharge the fluid into a duct 5.

The rotor is provided with a central fluid receiving opening 6, and the fluid from the supply tank ispermitted to enter the rotor only through this opening by means or a bafiie plate 7, The result of this construction is that the fluid passing between the impeller blades of the rotor follows substantially the line of discharge into the duct 5, and conseouently the resistance normally encountered in feeding liquid to a rotor is to a great cutout overcome.

Moreover, it is to he noted that the impeller blades t are reduced in width from the axial center of the rotor to the periphery thereof, and that the battle plate 7 follows the contour of the adjacent edges of the blades. This results in a constricted opening at 8 which leads to the enlarged discharge duct 5, the result being that the action of a Venturi tube is obtained, and the velocity of the fluid passing from the rotor is increased.

l have made the baffle plate 7 removable from the casing 1, so that the rotor may he removed through the face of the casing The rotor shaft 9, which is preferably made integral with the rotor, extends through the bearing housing 2, and a shoulder 10 on the rotor engages an adjacent shoulder on the housing which engagement not only prevents the movement of the rotor away from the baffie plate 7, but also, being machined, tends to prevent the escape of fluid through the bearing housing 2.

In order to properly support the rotor shaft 9 so that the rotor will he supported at one side only, and therefore may be removed through the opening 3 of the housing 1 and assembled with the supply reservoir so as to consume the least possible space in such a machine as it have mentioned, I have provided a pair of anti-friction hearings 11 and 12, which are disposed within the housing 2 and are in spaced relation with each other. The outer race 13 of each of these hearings is substantially fined with relation to the housing 2, and the inner race it of each of these hearings is substantially lined with relation to the shaft 9 so that the shaft will he supported by the anti-friction elements of the bearings which in the present instance are shown as halls.

ln order that any fluid which may pass the shoulder ill-between the rotor and the rotor housing 1 may be prevented from having access to the anti-friction hearing, l have proaided a compressible collar 15, which is adapted to lie between the adjacent bearing 11 and shoulder 16 on the housing 2 and 17 on the shaft 9. There is disposed between the compressible collar iii, which may he of suitable fibrous material, such for instance as wood, a metal plate 18, which is preferably resilient and has an inwardly turned portion 19, which is adapted to engage thehol lar .15 and lies adjacent to the face 20 at the lll l An outer annular spacing element 21 is disposed between the anti-friction bearings 11 and 12 and an inner annular spacing element 22 which is longitudinally co-extensive with the outer element 21, is likewise dis osed between the bearings. The outer memher 21 is adapted to engage the inner wall of the housing 2, and the adjacent edges of the outer races of the bearings while the inner element 22 is ada ted to engage the face of the shaft 9 and t e edges of the adjacent races of the bearings. These annular spacing elements 21 and 22 are preferably of a fibrous material such, for instance, as

China wood which has been dehydrated and I p which will seal the ioint between the packlng impregnated with oil. The space between the annular spacing elements 21 and 22 is tilled with a lubricant 23, preferably grease, which may be supplied to this space by a suitable grease cup or the like, 24. The collar 15, the bearings 11 and 12, and the annular elements 21 and 22, are held in their proper relationship by means of a nut 25 which is in screw threaded engagement 26 with the shaft 9, and bears against the adjacent bearing. This nut when properly adjusted to exert the requisite friction on the adjacent bearing, constitutes all the parts as part of the ultimate bearing, and likewise prevents any longitudinal movement of the shaft 9 in a direction, toward the bafie plate Z and consequently prevents any movement of the rotor in this direction.

A closure element26 is engaged with the outer end of the housing 2, which closure element may be in the form of a nut having screw threaded engagement at 27 with the end of the housing 2. The metal disc, which is frusto conical in term, is ada ted to be forced into engagement with a s oulder 29 on the housing 2 by the nut 26, which is likewise trusto conical in form,

a A filler 30 of compressible material, which is preferably made in a plurality of laminations, is disposed between the nut 26 and the plate 28 so that the pressure put on the nut is exerted on this plate. It is to be noted that a space 31 exists between the plate 28 and the adjacent bearing i2 in which space the nut 25 is located.

Should any fluid escape past the collar 15, its flow through the sup orting hearings will be prevented by the la ricant 23, which is disposed between the roller bearings, and which is, at course, forced into the bearings themselves, as shown in the drawings,

Moreover, any fluid which tends to escape around the shai t '9 will be prevented by t inner annular spacing element 22, because of the fact that this element will be expanded by the contact oi the water with it, and consequently will have watertight contact with v the shaft, and also will have a water tight contact at its ends with the adyacent races oi the bearings iii and Furthermore, any

mea re fluid which tends to escape in contact with the inner face of the housing 2 will cause the expansion of the outer spacing element 21, which expansion will produce an effective seal between the face of the housing and the outer element 21, and between the ends of this latter element-and the adjacent races of the hearings.

It is to be realized, however, that the lubricant which is forced from the supply 24 will pass to the space 21 and fiow toward the shaft 9 so that should any fluid escape to this space, its passage longitudinally along the shaft 9 beyond the nut 26 will be resisted by the aching 30, supplemented by the grease andthe shaft, and between the plate 28 and the shaft. The result of this construction is that the shaft while exending from only one side of the rotor, is provided a ith a two-point bearing, and a three-point fluid seal, so that the rotor will be given its proper rotary motion without vibration, and any tendency of the fluid to escape along the rotor shaft will be prevented,

In the modified form of the invention disclosed in Figures 9 and 10, the rotor 32 which *is of a form similar to that disclosed in Figure 1, is mounted similarly in a housing 33 provided with the bafie plate 84, and from this rotor a shaft 35 extends through a hearing housing 36. A relatively soft metal hearing 37 is mounted within the housing 36,,and is maintained in an adjusted position by set screws 38. This bearing 37 is forced, by means of a nut 32, which is in engagement with screw threads on the shaft 35, into water tight engagement with the face 40 on the rotor thus providing a continuous extensive bearing for the shaft. The escape of fluid from the rotor is prevented by the engagemerit of this hearing 37 with the adjacent face of the housing 36, the face 10 and the shaft 9. However, in order to more etlectively guard against the escape of fluid, T have provided closure 41 for the end of the housing 36, which is in theiiorni of a nut engaging the end of the housing and a plate 42 which is trusto conical in form and is adapt ed to be forced into contact with the shoul-' ders 43 on the housing, there being disposed as in the first instance a tiller 44: between the irusto conical plate 42 and the frusto conical nut dl, this filler being" of a compressible metal and preferably laminated.

it is to be understood that in both instances the provision of a trusto conical" plate 42- combination with a rotor and its supporting shaft of spaced bearings for the shaft and a spacing element located between the bearings and adapted to frictionally engage the shaft to prevent the passage of rotor impelled fiuid along the shaft from one bearing to the other, said spacing element being expansible on con tact with said fluid.

2. In a device of the class described, the combination with a rotor housing having a shoulder thereon and a shaft housing extending therefrom, of a rotor mounted in the first mentioned housing and having a shaft extending through to the last mentioned housing, a bearing for said shaft including a series of concentrically spaced rotor fluid checking elements, and means for forcing said bearing into contact with the aforementioned shoulder.

3. In a device of the class described, the combination with a rotor housing having a shoulder and a shaft housing extending therefrom, of a rotor mounted in the first mentioned housing, and a shaft extending from the rotor and through the last mentioned housing, a compressible bafile plate surrounding the shaft and contacting with said shoulder, a rigid backing for said plate, a pair of spaced anti-friction bearings, expansible rings extending between said bearings in concentric spaced relation and adapted to contact with the inner face of the shaft housing and the face of the shaft, and means for feeding a lubricant between and to said bearings.

4. In a device of the class described, the combination with a rotor housing having a shoulder and a shaft housing extending therefrom, of a rotor mounted in the first mentioned housing, a shaft extending from the rotor and through the last mentioned housing, a compressible bafile plate surrounding the shaft and contacting with said shoulder, a rigid backing for said plate, a pair of spaced anti-friction bearings, a pair of expansible rings extending between said bearings in concentric spaced relation, one in contact with the inner face of the shaft housing and the other in contact with the face of the shaft, means for feeding a lubricant between and to said bearings, and means for exerting {iressure on one of said hearings to force the afie plate into contact with the adjacent bearings and the aforementioned shoulder and to force the bearings into contact with said rings.

CHARLES A. MURDOCH.

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