US1295621A - Centrifugal pump. - Google Patents

Description

W. A. SIMOND.

CENTRIFUGAL PUMP.

APPLICATION FILED JUNE 10. 1916.

2 SHEETS-SHEEI l- Patented Feb. 25, 1919.

W. A. SIMOND.

CENTRIFUGAL PUMP.

APPLICATION FILED JUNE 10. I916.

Patented Feb. 25, 1919.

2 SHEETSSHEET 2.

3 nvewroz l pumpare shown posed. 'JThe invention in sofar as it pertains to;

. f inns ;anr are,

WALTER AIKEN SIMOND, 0F FRANKLIN, NEW HAMPSHIRE, ASSIGNOR TO THE GYRO PUMP COMPANY, OF HAMPSHIRE.

FRANKLIN, NEW- HAMPSHIRE, A' CORPORATION OF NEW CENTRIFUGAL rUMr.

Specification of Letters Patent.

Patented Feb. 25,1919.

Application filed June 10, 1916. Serial No. 102,928.

To all whom it may concern:

"rotor and the casing, and the provision of a waterseal for: the rotor shaft through the employment of which seal the use of the usual shaft-packings is obviatedand the entrance of air into the pump around the shaft is precluded. I

' Two embodiments or arrangements of the in'the annexed drawings,- where n:

Figure 1 is a vertical sectional view of a pump wherein the driving shaft is vertically disposed; p r v Fig.2 a horlzontal sectional view; and 1 Fig. 8a vertical sectional view ofa pump wherein the rotor-shaft is horizontally dis-3v the rotor proper may be said'to be an improvement upon the construction set forth and claimed in Letters Patent No; 1,062,803,

' ;granted to me under datelof May 27, 1913.

Referringv first'to theconstruction shown in Figs. 1' and 2, the upper portion of the pump frame or casing comprises a chameredportion 1, providedwlth-an upward hollow extension or hub 2,up'referably cylindrical in form, the chamber 3 therein being in direct communication with the space or an 'openingand the lower end of a bearing chamber 4 in the body portion 1.- The lower wall or floor of chamber 4 is provided with sleevel5, for thedriving shaft 6, is seated in said opening making a tight fit "With'the walls thereof; The upper enlarged end of I said sleeve 5 is notched out, as at 7, and

' finds its bearing in the lower'end of extenf I sion '72, the notches or openings affording direct communication for the sealingfiui from chambers to chamber 3.- a Shaft 6 which makes a close fit with the sleeve 5,1and by which it is positioned, ex, tends r upward through chamber 3 and through acap piece &mounted' on the upper cndof extension 2. The lowertend of the shaft extends belowthe lower wall of body 1 and into the suction chamber of the pump formed by said lower wall and a casing member 9, which latter is secured in anysuitable manner, as by machine screws 10 to the lower face of the body 1'. The' casing is provided vwith a centrally disposed inlet 11 and a peripheral outlet 12, the latter by preferance being tangentially. disposed.

The rotor of the pump comprises a disklike member 13, having a centrally disposed hub. 14 connected to the body of therotor by-spokes 15 which construction'provides an opening centrally of the rotor, interrupted only by'the spokes.

The. upper portion of the-hub is preferably internally threaded and screwed upon to, a pair of like or equal volutes or spirals 18 and 19,said spirals 'bein on opposite sides.

ranged that one ofthem" is 180 degrees in ad- Vance of the other; As a consequence of such arrangement or. disposition, every similar point is diametrically opposite, whereby the deviceris thoroughly balanced and the efliciency of, the pump is materially enhanced or. increased. In fact I have found by extended use, that the shaftfi is practically of the disk or. body. mom or 13 and so arrelieved from all side, aswell as, end' thrust,

even when operated at fhighspeed.

Casing 9 is provided with a port2i) from which extends a pipe 21 leading to "atank' 22. A valve. 23 controlled by afloat 24: located in tank 22, is placed in pipe 21 and serveslto I close the valvewhen the water (or other fluid being pumped) has reached a predetermined level in the tank. The vlower portion-"0f the tank is in; direct communication with chamber' l through'a pipe 25. This construction or arrangement-serves at all times to maintain a body of water in the chambers 3 and 4.

up to a level above the upper end of sleeve orbearing 5',---.therebypreventing the ingress of air into the vacuum or suction chamberof the umpfalong or around, the shaft.

With the foregoing'arrangement, chamber 4 acts as a sediment chamber and the top of the sleeve or shaft bearing 5 is submerge'd'at all times in clear water the static pressure of which. is practically negligible. This water gradually flows along the shaft, lubrieating and keeping it cool and at the same time preventing the ingress of air into the suction or vacuum chamber of the pump through the shaft bearing. It will be noted thatthe static pressure of the sealin fluid is at all times independent of the variations of head or pressure in the discharge chamber of the pump and that a constant supply quired to effectually seal the vacuum cham ber.

While I have shown and described a' float valve arrangement for maintaining the proper level of the fluid for sealing purpose, it is evident that such arrangement maybe modified, so long as the proper water level is maintained in the sealing chamber and that under low static pressure. It is to be noted that no mechanical packing is necessary. 1

In Fig. 3 -a slightly diiferent arrangement is shown wherein the shaft designated by 26 is'horizontally arranged and provided with a driving pulley 27 located intermediate two supporting bearings 28 and 29. The-rotor 30 is of the same form as that in Figs. l and 2 and the pump casing is formed of a supporting body member 31 and a shell or housin 32. I

he rotor in this instance is provided with an elongated hub 33 which fits over the reduced end of shaft 26 and extends into the I outer end of a sleeve or quill 34 mounted on i the shaft.

7 Said quill at its outer end or that next adjacent the rotor extends through a bearing sleeve 35 which makes a tight fit.

with the body portion 31. r The quill is also provided with a plurality of rings 36, which take in rooves 36 formed in the inner face of a mu tipart bushing 37, the circumferential face of which is provided with recesses or made concave, as at 37 and feed openings 37 passing therefrom into the grooves 36. A grease cup 38, of that type which employs a piston and light compression spring, is mounted in a saddle 'or casting 39, which overlies the bushing and the adjacent end of bearing sleeve 35. The grease is forced into the grooves 36 from the cup 38 under light pressure.

A pipe 40, correspondin -to pipe 25, in: that it is deslgned .to convey water at static pressure, opens into a space 41 formed between the inner end of sleeve 35 and the bushing 37 and serves to maintain a body of water around the quill and to preventthe ingress of air into the vacuum space of the be noted is provided with a centrally disposed opening which permits fluid to pass from one side to the other thereof and, as a consequence, but a single inlet opening to the pump casing is essential.

It will be readily appreciated by those skilled in the art that the arrangement of water seal upon the horizontally-disposed shaft maybe employed with a pump of the double-suction type, or .one having inlets upon opposite sides of the rotor, in which event the water seal feature-will be duplicated.

Having thus described my invention, what I claim 1s 1. In a centrifugal pump the combination .of a rotor consisting of. a disk-like body member having a centrally-disposed opening therein, and likewise having on each side thereof a smgle splral channel, the channel on oneside being approximatel 180 in advance of the channel on the ot er side, and said channels being non-alined throughout their length; a shaft on which the body is mounted and by which it is adapted to be rotated; and a casing inclosing the rotor, said casing having a single centrally disposed inlet of a slze substantially equal to the opening in the disk and at all times coincident therewith, ,and said'casing likewise having a peripheral discharge opening.

2. In a centrifugal pump, the combination" of a rotor comprising a disk-like body, hav- .ing a centrally disposed hub with an opening through the body immediately adjacent to and substantially surrounding the hub, and likewise having on each side thereof a single spiral channel, the channelon one side being approximately 180 in advance of the channel on the other side, and said channels being non-alined throughout their lengthga shaft secured in the hub; a casing inclosing the rotor, said casing being provided on one side with a centrally disposed openingv coincident atall times with the openin in the disk for the admission of fluid, an -with a peripheral outlet; and a bearing for the shaft extending from the opposite side of the casing.

3. In a rotary pump the combination of. an

impeller having means thereonfor throwing outwardly by centrifugal force the liquid to be pumped; a casing for said impeller, said Casing having a second chamber separate and distinct from the impeller chamber and adapted to hold a sealing fluid; a bearing sleeve extending from the casing and terminating within said second chamber at a distance from the inner Wall thereof and beextending from the tank and communicat-' ing in free communication at its outer end ing 'with the lower portion of said second 10 with the fluid in said chamber; a shaft eX ehamber,wherebyapacking or stufling gland tending through said bearing sleeveand to is rendered unnecessary and an air-tight 5 which the impeller is secured; a tank; a pipe packingless joint is produced for the shaft. extending from the impeller chamber and In testimony whereof I have signed my terminating in saidtank; a float controlled name to this specification. va1ve located in said pipe; and a second pipe WALTER AIKEN 'SIMOND.

Images