US807971A - Centrifugal pump. - Google Patents

Description

No. 807,971. PATENTED DEC. 19, 1905. G. W. SKINNER, JR.

OENTRIFUGAL PUMP.

APPLICATION FILED APR.19, 1905.

3 SHEETS--SHEET 1.

No. 807,971. PATENTED DEC. 19, 1906.

G. W. SKINNER, JR.

GENTRIFUGAL PUMP.

APPLICATION FILED APR.19. 1905.

3 SHEETSSHEET 2.

i ma/aces @zz djf%% i ""2 P 2% gm WW without injury to the mechanism.

GEORGE W. SKIN N ER, J R.,

OF DENVER, COLORADO.

CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application filed April 19, 1905. Serial No. 256.503.

To all whmn it may concern.-

Be it known that I, GEORGE W. SKINNER, Jr., a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and use ful Improvements in Centrifugal Pumps; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in centrifugal pumps more especially intended for handling sand, slime, and gravel in the treatment of placer material, though of course it may be employed in handling material of the character stated regardless of the object or purpose of so handling it. Pumps of this character are employed in connection with the construction set forth in my application for placer-mining apparatus, Serial No. 254,865, filed April 10, 1905. In a pump for this purpose it is particularly desirable that provision shall be made for protecting the bearings from the sand, grit, and dirt which under ordinary circumstances are sure to come in contact therewith during the treatment of material of this character. Pumps employed for this purpose must of necessity be provided with a detachable lining adapted to be removed when worn in order that new linings may be successively substituted. The material under treatment works in between the lining and the body of the pump and thence finds its way into the bearings, and if no provision is made for its removal these bearings will soon wear out or become destroyed and greatly increase the cost of maintaining the apparatus.

In my improved construction I have formed a water-space around the bearing of the shaft connected with a rotary piston. I have also made provision for supplying this space or chamber with water and for drawing the water therefrom. This water inlet and discharge may be constantly maintained, whereby any dirt that otherwise might come in contact with the bearing with injurious results will be washed out and carried away I have also made provision for leaving a slight wator-space between the lining and the body of the casing. This space is also supplied with water, and provision is further made for the escape of the water therefrom, thus having a tendency to keep the pump clean from dirt and sand. This feature prevents to a large extent the entrance of dirt to the bearings, since there is little opportunity for the dirt to get to the hearing or bearings except by way of the space between the lining and the body of the pump-casing. Provision is also made for mounting two pumps upon the same operating-shaft, with the inlet and discharge of one pump extending in different directions, respectively, from the inlet and discharge of the other pump,whereby the strains to which the pumps are subjected by reason of the coarse material handled by them are neutralized or overcome to a certain extent, since by reason of the aforesaid arrangement these strains or forces are made to work against each other.

Having briefly outlined my improved construction, as well as the function it is intended to perform, I will proceed to describe the same in detail, reference being made to the accompanying drawings, in which is illustrated an embodiment thereof.

In the drawings, Figure 1 is a vertical section taken through a centrifugal pump equipped with my improvements. This section is taken on the linel 1, Fig. 2. Fig. 2 is a section taken at right angles to Fig. 1, being a section taken on the line 2 2 of the lastnamed figure. Fig. 3 is an enlarged fragmentary sectional view of a portion of the right-hand side to Fig. 1. Fig. 4 is a detail view, partly in section, illustrating the ballbearing construction with the operatingshaft. Fig. 5 is a view illustrating two pumps mounted on the same operating-shaft and arranged with their respective inlets and discharges extending in different directions.

The same reference characters indicate the same parts in all the .views.

Let the numeral 5 designate the pump-cas ing, the same being composed of two members provided with exteriorlyprojecting meeting flanges 6, connected by bolts 7. This casing at one extremity is provided with a stuffing-box 8, the same being connected with the casing in such a manner as to form a water-chamber surrounding the inner extremity of the operatingshaft 10, where it is connected with the rotary pumppiston 12 by means of a key 3. This chamber 9 is located just inside the stuffing-box bearing for the said shaft. The stu'l'fing-box may be of any rection indicated by the arrows in Fig. 2.

The casing 5 is provided with a circular lining 17 and wearing- plates 18 and 19, located on opposite sides and cooperating with the lining to protect the casing or body portion of the pump. The lining and these wearingplates are removable when worn and new corresponding elements substituted therefor as often as may seem necessary or desirable. Provision is made for allowing a slight space 20 between the casing and the lining and the wearing-plates for the circulation of water, the water being introduced through a conduit 21 and taken out through a conduit 22. In this way the water is introduced to the space 20 and taken out therefrom on opposite sides of a ballbearing construction 23, surrounding the inlet-conduit 14, through which the material to be treated passes to the pump. The space 20 between the casing and inings thereof is maintained by means of set bolts 24, which are threaded in the body of the casing or parts directly connected there with and bear against wearing-plates 18 and 1.9. These wearing-plates and the lining are providedwith oppositely-beveled edges where they join. a

The water-chamber 9 is closed on the inside or on the side opposite the stuffing-box 8 by means of a comparatively thin washer 25, connected with the wearing-plate 18 by means of taper bolts 26, which pass through packing- washers 27 and 28, preferably composed of leather and interposed between the washer 25 and the wearing-plate 18. On the inside of the washer 25 is a rubber gasket 29, connected with the washer by screws 30. Inside of this washer 29 is a metal ring 31,connected with the body of the rotary piston by screws 32. The rubber gasket 29 closely engages the hub 33 of the rotary piston. This hub is recessed to receive the operating-shaft 10. The close fit of the rubber gasket around this hub has a tendency to prevent the material under treatment from gaining access to the bearing of the operating-shaft and to keep the dirt out of the chamber 9. The leather washers 27 and 28 have a further tendency to prevent the dirt or material under treatment from entering the water-chamber 9.

It will be known from the drawings and from the general information with reference to pumps of this character that the rotary piston 12 is open and that this opening registers with the inlet-conduit 14:, through which the material to be treated passes. posite side of the piston, or that directly in front of the inlet-opening 34, is reinforced, as shown at 35, and tapers gradually therefrom to its outer periphery. The inner surface of this reinforced portion is provided with spiral ribs 36, whose tendency is to cause the material to readily move outwardly from the center of the piston as it strikes thereagainst as it is fed into the machine, thus as far as possible relieving the apparatus from the end thrust incident to the entrance of the coarse material of the class which the apparatus is designed to handle. The vibration incident to the striking of the material against the reinforced side of the piston is relieved through the instrumentality of the flexible washer 29 and the other construction in close relationship therewith, as heretofore described.

From the foregoing description the use and operation of my improved centrifugal pump will be readily understood. By reference to Fig. 5 the manner of mounting two pumps on the same operating-shaft 10 will be readily understood. These pumps are both of the centrifugal type, but not exactly the same in external appearance. However, they may be considered the same for all practical purposes. The pump on the left of the View is precisely of the same construction shown in Figs. 1 and 2 of the drawings. The pump on the right, which I will designate as 5, is slightly different in external construction; but its interior mechanism may be considered substantially the same. The inlet-conduits of these pumps outside of the casing 50 may be designated A and B, respectively, while their discharge conduits or outlets may be designated 16 and D, respectively. The power is transmitted to the shaft 10 through the instrumentality of a belt E or other suitable instrumentality for operating both pumps. As the inlet and discharge of one pump extend in different directions, respec tively, from the inlet and discharge of the other pump, it will be understood that the strains to which the pumps would ordinarily be subjected during their operation will to a certain extent be neutralized and overcome, as heretofore explained.

By reference to Figs. 1 and 2 of the drawings it will be understood that as the material enters the pump by way of the conduit 14 through the piston-0pening 34 this material under the influence of the rotary action of the piston will be thrown outwardly into the chamber 15, through the piston-openings 13, and thence carried through the outlet 16.

The piston discharges or mouths 13 are each provided on one side with a wearing shoe 37, the same being detachably connected with the body of the piston by bolts 38, inserted from the outside through pockets 39, formed in the members 410 of the rotary piston. These wearing-shoes are subjected to The opmost of the wear on the piston and are readily detachable when they become worn. By reason of this feature the body of the piston may be used indefinitely by simply removing these wearing-shoes and substituting others at suitable intervals. At the angle 41 of the pump-chamber adjacent the discharge-mouth 16 is located a detachable wearing-plate 42 of angular shape and preferably made of hardened metal or other suitable material having great wearing capacity. It is at this angle of the chamber where the shell or casing is subjected to the greatest wear, since the material, or at least a portion of it, is thrown against the angle-shoe 42 with great force. This angle-plate is held in place by a bolt 43, passed transversely through the casing.

As shown in Fig. 4, the operating-shaft 10 is mounted on pedestals 44, provided with ball bearings, each consisting of a spoolshaped central member 45, having recesses in its opposite ends to receive the bearingballs 46. On each side of this spool and threaded on the shaft 10 is placed a nut 47, forming the other member of the ball-bearing, the said nut being recessed to receive the bearing-balls and held in place by a lock-nut 48. These ball-bearings are adapted to resist the end thrust on the shaft incident to the discharge of the material against the reinforced part of the rotary piston of the ump.

Having thus described my invention, what I claim is the body of the pump-casing, inlet and outlet means for introducing liquid to and removing it from the space, a rotary piston mounted in the casing and provided with a water-containing chamber adjacent the piston-bearing, and means for introducing liquid to and removing it from said chamber.

3. A centrifugal pump provided withacasing having a removable lining, a shallow space being maintained between the lining and the casing, means for introducing water a rotary piston mounted in the casing and having detachable wearing-shoes forming one wall of the outlets from the piston to the body of the pump.

movable lining, a shallow space being main tained between the lining and the casing, and means for introducing water to this space and removing it therefrom at will, the casing being provided with a detachable angle-shaped wearing-plate located adjacent its outletopening and extending inwardly therefrom for the purpose set forth.

5. In apparatus of the class described, the combination of a number of centrifugal pumps, a common operating shaft upon which the pump-pistons are mounted, one pump being provided with inlet and discharge conduits projecting respectively, in different directions from the inlet and discharge conduits of another pump for the purpose set forth.

In testimony whereof I aflfix my signature in presence of two witnesses.

Witnesses:

DENA NELSON, A. J. OBRIEN.

to this space and removing it therefrom, and v 4. A centrifugal pump provided with a re-

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