US2003666A - Pump - Google Patents

Description

June 4, 1935- c. H. MONEYPENNY 2,003,666

PUMP

Filed May 5, 1932 2 $heets Sheet l Zlvvuwvtov H Money nanny,

' III/I June 4, 1935. c. H. MONEYPENNY PUMP Filed May 5, 1952 2 Sheets-Sheet 2 Patented June 4, 1935 UNITED STATES PATENT OFFICE 3 Claims.

My invention relates to pumps and particularly to machine tool pumps designed to handle coolants or lubricants, but is not necessarily limited to this class of pumps.

It is an object of the present invention to provide a pump assembly which is composed of relatively few simple parts and which may be readily disassembled for repair, replacements or adjustment.

It is also an object of the invention to provide a pump which will not lose its prime when not running and which will not eject its prime if run in reverse.

Another object of the invention is to provide a cap plate carrying the discharge outlet and which may be quickly and easily adjusted to dispose the discharge outlet in any position desired.

Another object of the invention is to provide an improved form of impeller member.

A further object of the invention is to provide an improved form of mounting for the impeller.

A still further object of the invention is to provide improved lubricating means for the bearings of the impeller.

Other important objects and advantages of the invention and not specifically referred to will become apparent during the course of the following detailed description, when read in conjunction with the accompanying drawings, which form a part of this specification and in which:

Fig. l is a central vertical section through the assembled pump,

Fig. 2 is an end elevation of the discharge end the cap plate in one position of adjustment.

Fig. 3 is a similar view showing the cap plate in another possible position of adjustment,

Fig. 4 is an enlarged section of the shaft packs.

Fig. 5 is a side elevation of my improved impeller member,

Fig. 6 is an end elevation looking to the left on Fig. 5,

Fig. 7 is an end elevation looking to the right on Fig. 5,

Fig. 8 is a flat template layout of the design of the blades on the surface of the impeller, and

Fig. 9 is a fragmentary view of an alternative method of sealing the outer end of the center bore of the cap plate.

Referring now to the drawings in detail, and particularly to Figs. 1 to 4, l0 indicates the housing of the pump, which is formed with a suitable base H and a substantially conical impeller chamber l2 within which is mounted an impeller member I3 in the form of a conical body having spiral blades l4 formed on the slanting face thereof, the particular structure and design of which will later be described in detail. It will be noted that the taper of the walls of the chamber [2 is substantially the same as that of the impeller body, so that the distance therebetween is equal at all points.

The housing III at the larger end of the impeller chamber l2, terminates into a circumferential rim l5 which has the end face thereof machined off to provide a seat for a cap plate l6 which closes the open end of the chamber l2, and which is formed with an open volute channel I! on the inner face thereof which is of gradually increasing depth and which terminates into a discharge outlet fitting l8 for the connection of a suitable discharge pipe (not shown).

The cap plate I6 is formed with an annular flange l9 which overlies the periphery of the rim l5 and which carries a plurality of circumferentially spaced and pointed set screws 20 which engage the slanting wall of a groove 2| formed in the peripheral edge of the rim l5 to draw the cap plate into sealing engagement with the end of the housing l0 and to lock the same in position. It will readily be seen that this novel method of securing the cap plate to the housing permits rotary adjustment of the cap plate so as to permit placing of the discharge outlet in any desired circumferential position, as illustrated in Figs. 2 and 3, and also does away with forming bolt holes in the gasket 22 which is interposed between the cap plate and the end of the housing 10.

The small end of the impeller chamber I2 opens into an inlet or prime chamber 23 which is provided with an inlet opening 24 at the top thereof to which a pipe leading to the source of liquid supply may be readily attached. By having the inlet lead into the top of the inlet chamber 23, the prime in the pump is not drained when the pump is not operating and the piping can be conveniently carried down to the source of supply from either side.

The pump housing l0 and'cap plate I 6 are formed with axially alined hollow bosses 25 and 26 respectively within which the respective ends of the shaft 21 of the impeller l3 are journalled in ball bearings 28 and 29, the bearing 28 having the outer race 30 thereof resting against an inwardly directed shoulder 3| formed within the bore of the boss 25, while the outer race 32 of the bearing 29 has a sliding fit within the bore of the boss 26.

The shaft 21 is provided with oppositely directed rounded shoulders 33 and 34 against which the inner races 35 and 38 of the bearings 28 and 29 are seated, and a compression spring 31 confined between the bearing race 32 and a threaded sealing plug 38 which closes the outer end of the bore of the boss 29 provides an end thrust on the shaft 21 and serves to keep the bearings tight and'in place. This spring also provides a yielding means to permit the entire impeller assembly to give slightly in an axial direction in case some hard foreign matter should become wedged be-- tweenthe impeller blades and the surface of the impeller housing.

Suitable grease or oil seals 39 are disposed within the bores of the bosses 25 and 26 between the bearings 28 and 28 and the pumping chamber so as to seal the space around the shaft and protect the bearings from contact by the liquid being pumped. These seals, as shown in Fig. 4, include a flared circular ring or blade. which is spring-pressed against a felt or leather packing member 4| to maintain the latter in close contact with the shaft 21, the entire body of the seals being pressed into position within the bores of the bosses and maintained therein by frictional contact. Set screws may be employed to further secure the seals in their proper positions, if desired. A similar seal 42 closes the outer end of the bore of the boss 25 around the protruding end of the shaft 21 to which any suitable driving means for the impeller may be connected.

Pressure grease fittings 43 are carried by the bosses 25 and 26 for feeding lubricant into the chambers behind each of the bearings 23 and 29, By mounting the grease seals with the edge of the blades 40 facing the pump chamber, old grease may be forced out through the seals into the pumping chamber and thus carried away with the liquid being pumped.

Referring now more particularly to Figs. 5 to 8, the body of .the empeller I3 is substantially coneshaped and the blades l4 are generated on the surface thereof in substantially spiral form. The impeller body may be secured on the shaft 21 by means of a press fit or may be keyed thereon.

The blades I4, which may be in any desired number or depth found most desirable, are spaced equal distances apart adjacent the small end of the impeller body and continue in a spiral path to the base end, where they are flattened out as at 43 to lie in a plane substantially at right angles to the shaft 21 and overlying the volute channel IT in the cap plate It.

The back face of the impeller body is concave or dished, as clearly shown in Figs. 1 and 6, and is provided with blades 44 which extend in a slight curve from the central area of the base and merge with the free ends of the flat portions 43 of the blades l4. These blades 44 serve to discharge any foreign matter or liquid that would otherwise collect behind the impellerbody.

In Fig. 8 is shown a flat template illustrating the design and layout of the blades l4 on the surface of .the conical body l3, with the exception of the flattened portions 43 thereof. In ,the design shown, B is the slant height of the frustrum of the cone surface of the impeller body, A is one half of the total circumference of the cone, and E is a point where a radial line bisecting the dimension A crosses a circumferential line bisecting the dimension B. The points C and F' are points at the base and apex of the cone template at opposite extremities of the dimension A.

Thus a line representing the center of a blade and starting at F and describing an are passing through the point E and terminating at the point C will have traveled one-half of the total circumference and. will be a true are of a circle with the radius R. The length of the radius R and blades up against the conical surface and ac celerated in action as it draws near the rim at the large end of the body where it is forced into the channel l1 and through the outlet by the flattened portions 43 of the blades l4.

It will be noted that there are no revolving parts within the pumping chamber dependent upon closely machined and fitted parts'for efficient operation, thus the pump will be practically immuneto trouble due to wear of the parts. Since the spring 31 provides means to prevent jamming and'breakage due to foreign matter becoming caught between the blades and the housing, the pump is practically trouble and wear proof.

In the form illustrated, the pump is designed to run in a clockwise direction. By reversing the paths of the outlet channel and impeller blades, the pump could be run in a counterclockwise direction without further alterations.

While a preferred embodiment of the invention has been shown and described, it will be understood that various changes in the details of construction and operation may be resorted to without departing from the spirit of the invention within the scope of the appended claims.

I claim:

1. A pump impeller comprising a conical body portion, substantially spiral blades formed with said body portion, each of said blades comprising an arcuate portion beginning adjacent the apex of said body and extending in an arcuate path around one-half the circumference of said body portion to the base thereof, said arcuate portion of each of said blades passing through a point one-half of the circumferential distance between the terminals thereof and one-half the height of the conical body, said blades when laid in flat pattern forming an arc one-half the circumference of a true circle.

2. A device according to claim 1 and, substantially radially disposed curved blades formed with the base end of said impeller body.

3. A pump impeller comprising a conical body portion, substantiallyspiral blades formed with said body portion, each of said blades comprising an arcuate portion beginning adjacent the apex of said body and extending in an arcuate path around substantially one-half the circumference of said body portion to the base thereof and terminating in a flattened portion of substantial area disposed at substantially right angles to the axis of the impeller body and forming a continuation of the base end thereof, and substantially radially disposed curved blades formed with the base end of -said impeller body and merging at their outer ends with the back of the free ends of said flattened portions.

CHARLES H. MONEYPENNY.

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