US1037244A - Centrifugal pump. - Google Patents

Description

A. E. GUY. GENTRIFUGAL PUMP.

APPLIOATION FILED MAR.11. 1912.

A. E. GUY.

GENTRIPUGAL PUMP.

APPLIoATIoN :FILED MAB. 11. 1912.

1,037,244. Patented sept. 3, 1912.

.\\\\\ v 2 SHEETS-SIRET 2.

einem EGUY, or, Tamron, New wasn.'

cumunrruear. PUMP,

Specification olltetterelatent. i 'Patertd Application and Marcil 1111912.. seriaitimassiste.y

T o allwhom. t may concern-:f

, Be it known that- I, ALBERT E. GUY, a resident of Trenton, in the county of Mercer I and State of New Jersey, have invented a3 new and useful Improvement in Centrifugal Pumps, of which the following is a speci-fication'. f This invention relates to, centrifugal pumps, and particularly to that type of pump l`in which the pump, casing is made in two or more separable parts' joined' ona plane- "parallel to--the axisof the driving shaft and passing therethrough.

The objects 4of the invention are to provide an improved construction-'and arrangement of the casing for a pump of the charf acter described; to provide' an improved pump which may fbe accommodated to different existing arrangements of systems or-I conduits with greater facility than pumpsg' of those types now in use; and to provide a l constructionv which minimizes strains and@ stresses in the driving. shaft and connectedg parts during operation of the pump.

A further object of the invention y,is toi provide a construction of pump in whichv ag more effective packing may be obtained.

Further objects of t-he invention are part obvious and4 will in part appearzhereinf after. Inrthe drawings Figure 1 represents a? lon itudinal cross section through a cen-f triglgal pump constructedfaccordlngA to my f invention; llig..` 2' is a plan: view of the-same; Fig. -3 is a side' viewl of the same; Fi 4 is an .end view of the pump shown in ig..?,`

as the same appears.- from the right; Fig. 5

is a cross sectional view through a thrust; bearing on the line 5 5, Fig. 1; Fig. 6 isi 'an end View' of' the thrust bearing4 sleeve,: from' the right in Fig.v 5; and Fi 7` is an; end view from the left of' that portion of the driving shaft shown inl Fig. 5.

The pump illustrated in the drawings is formed-with a body l, comprising two parts, 2 and 3, joined togethervon a. plane passing through the axisvof the rotatable driving shaft 4, as yillustrated in Fig. 3. The part 3" is intended tobe suitably secured to the base, bed plate or foundation and is ordi` narily termed the casing. The part 2 is termed a cover and is removable from the casing to expose the inner parts of pump for inspection lor repair. Shaft 4 extends longitudinally through thel body and carries upon it the rotatingparts of the pump.` y

The body 1, as illustratedlis providedfwith chambers on its .interior t rough whichA the liquid passes during the courseof 'operation oft-he pump. The Vpump body has on the suction side, `a main intake chamberlj, an mlet chamber 6, then-an impeller; chamber 7 followed by a return bend, entering into the return-passageQ. In said return pas sage 9 are ribs or vanes 10, the pur ose of which is to uide the liquid centripetally intothe inlet end leading to the second im- 'pellen With this type of. pump to each impellen, except that adjacentto the dischargeside, there is; an impeller.chamber,y a return bend andra return 4passal efprovided withv guidevanes, and; the com ination. of these partsl constitutes one. stage: of the pump. The return bend `of the-last stage leads the liquid centripetally into. a disfcharge chamber 10. Hence although Fig. 1`A

il1ustrates;the application Aof my. yinvention to a three-stage pump, 1t is. to be understood .that said. inventlon may be applied toaJ pump having'one or an number of stages.

The invention may also e applied to single sta e pumps'y of t-hemulti-stage type-.i

ach impeller chamber y7 isfformed be.- tween walls 11 and 12 and in each impellel chamber is located an. impeller 13 mounted to rotate withthe shaft 4.. -As shown, three impellers 13 are mounted uponthe central portion -of shaft 4, which may be of the same .diameter as the main end portion 14 ofthe shaft, but preferably is slightly greaterin .diameter to provide a collar l5 having an end shoulder, and a screw threaded portion 16 .on the shaft to receivea protecting sleeve 17 therefor, which is threaded onto the threaded portion 16 of the shaft The central portion and the main end portion 14 of the shaft are made of full diamej ter to provide maximum rigidity and minimum deflection or sagging thereof, and at the same time to guard against the bad ef.- fects of critical speed of the shaft. The size of those portionsv of the shaft referred to will always be selected to cbt-ain the results stated. The impellers 13 are spaced apart along the shaft and are clamped between ,y

collar 15 and a nut or collar 18 threaded onto the other reduced end19 of the shaft.

To minimize leakage from each impeller chamber 7 to a balancing chamber 20 on one side and the inlet chamber 5 on the other side, suitable tightening or running joints 21 are formed bet-Ween the impellers and the walls 11l and 12 of the body. These preferably embody separate or separately renewable annular flanges mounted in the bore of t-he body and separate or separately renewable annular flanges intermeshing therewith and secured to the impellers, and specifically of the type illustrated and de- It is found diiiicult in practice, with the ordinary types of centrifugal pumps to c onnect any given type of pump to allvexistlng arrangements of conduits for which pumps are desired, by reason of the fact that thev inlet and discharge conduits indifferent eX- ist-ing systems or installations lead to the pump location from' different directions.

To obviate the necessity of building special I pumps for diiferent systems or installations, or of multiplying the number of types of pumps to be carried in stock, the present pump is so constructed as to be adapted for connection at a plurality of points to a suc, tion conduit or conduits, and similarly, forl connection at a plurality of points to a discharge conduit or conduits. As shown, one end of the casing 8 is formed to provide anv intake passage 25 which extends transversely thereof or in a direction normal to the shaft. 4. At its middle port-ion, the intake passage 25 is connected to the intake` chamber 5 by a passage 26, which extends upwardly along wall 12 of the body and branches out around the shaft 4 and merges into the intake chamber 5. That portion of' the casing forming the intake passage 25, is

`substantially cylindrical and is in the formf of a duct o-r pipe 60 havingsuitable means at each end, as a fiange 26, adapted for connection to a conduit ofthe system. At the other end of the pump, the discharge chamber 10 leads into a discharge passage 27 which is also in thel casing 3 and similar 1n arrangement to the intake passage 25 and extends transversely to the casing. The

liquid fio-wing through the return bend 8 of the last stage of the pump and into discharge chamber 10 and discharge passage 27 is led centripetally along a wall 50 of the return passage 9 inwhich are provided radial vanes 10a. Return passage 9 flares in- I wardlyand thus causes the velocity of the liquid to be gradually reduced so that it Hows quietly through the discharge chamber 10 and circumferentially around the discharge chamber 10 and into the discharge passage 27, thus preventing disturbance of the stream of liquid, which might occur if the liquid issuing from the final stage of the pump impingedv normally onto the stream flowing through discharge passage 27. vThat portion of the casing forming the discharge passage 27 is formed at each end with suitable means; as for example, flanges 28,

adapted for connection to a discharge conduit of the system.

It will be observed that the ducts or pipes 60 and 61 forming intake passage 25 and discharge passage 27 form transverse beams, as it were, rigidly connected to the casing 3 and well adapted for supporting the weight of the pump and its contents. stated, the conduits of the system are connected to the beams 60 and 61, which are a permanent part of the fixed casing, the position of which need never be disturbed for inspection or repair. This can'be accomplished by the simple removal of the cover. There is, therefore, no danger of affecting the alinement of the pump, which might occur if the connections to the conduits were required to ybe disturbed. Moreover, by referring to Fig. 1, it will be seen that the beams 60 and 61 are spaced apart from each other and that a clear space 51 is left between them under the main portion Also, as

of body 1. Between the beams 60 and 61,

the body and its contained parts are symmetrical in transverse section, there being no rigid connection of the casing 3, bet-Ween the beams 60 and 61, to the support upon or to which the pump is connected.

In a pump of this character, the pressure in the body resulting from the action of the impellers, is often considerable and causes some expansion and, consequently, change in dimensions, of the bod This, of course, is comparatively slight but it is often sufficient, in the ordinary type of pump with a rigid base running the full length of the body, to cause unequal eXpanitself.

sion of the body above and below the shaft 4, and results in flexure of the shaft l4 and wear in 'the running joints. These objectionable features are avoided by the resent construction. Preferably, a suit-ab e foot 30 is provided at each end of the duct 60 forming intake passage 25 and a similar foot 30 at each end of the duct 61 forming discharge passage 27, these being arranged to rest upon a suitable support or base 31. In practice one pair of feet, such as the feet 30a are firmly and rigidly secured to support 31, as by being bolted thereto. The other feet 30 are also secured to support 31,

but in any convenient manner to permit slight play or longitudinal movement of the feet 30.with reference to the feet 30a. A.

slight clearance 52 is also provided between i the end of the body l and the driving connection 41 on the end of shaft 4. By reason of the construction stated, the body 1 of the pump may expand slightly along the shaft 4 when the pressure in the body 1s sufficient to cause such a result. Such expansion is permitted by the relatively loose connection of the pairs of feet, as above described, and clearance 52 and will be equal on all sides of shaft 4, as is obvious. Liability to distort-ion of the shaft is thus materially diminished.

At the discharge end of the pump, a suitable thrust bearing is formed between.' the shaft 4 and the body 1. In the form. shown, this comprises a, hollow bearing member secured to the body and having@ a bore provided with annular grooves 36 in which rotate annular ianges or collars 37;,` formed on'a :sleeve 38 mounted on a reduced j end 39 of end portion 1.9 of shaft 4. To secure the sleeve 38 to rotate with shaft 4, the port-ion 19 of the shaft is flattened on opposite sides adjacent to the ortion 39, as inl dicated a't 40 in Fig. 7. pposite portions of the end of the sleeve 38 arecut away, as i at 41, to leave projecting side members 42. embracing'and fittingthe flattened portioni 40 of the shaft, as indicated infFig. 5. At,l its extreme end, the shaft 4 is further re-, d-uced as at ,43, and the sleeve 38 is of such* length 'as to project sli htly over the reduced ort-ion 43 of the sha t.v To hold sleeve 38 rmly in positioma nut44 is threaded ong the end of the shaft and is tightened against a washer 45 interposedbetween the same 'and l the sleeve 38. The thrust bearing described i positively insures rotation of the sleeve 383 and, since the nut 44 rotates therewith,y vibration is the lonly element which can. cause loosening of the parts. This may be@ prevented by any of the well known means; for such purpose, such as by slight deformation of the threads between the nut and the shaft at the end of the latter.

lThe thrust bearing described is not claimed herein but will. form the subject-f matter of a separate application. p l

Beneath the thrust bearing, the casing 3i. is formed with a chamber 46 for holding o il j or other lubricating material. A similar chamber 47 isformed in the casing atthc lother end of the body, and oiling rings 48" are placed about the shaft to carry to and distribute the oil or other lubricant upon its surface.

In centrifugal pumps of the present type, it 'is usual to rotate 'the shaft for driving the impeller from a source of power connected at the discharge end of the pump.- This requires the shaft to be strongest at Y the discharge end of the pump Where the drive is. received, ,and consequently, practi- 'cally of full diameter at that end. Diiiicul.-

ties in packing the pump increase with the diameter. of the driving shaft and in the case mentioned, Where the shaft is .of large diameter at the discharge end of the pump, and Where the pressure'in the body is always the greatest, these difficulties are correspondingly increased. In the present construction, the shaft 4 is of full diameter, and the driving connection 41 is provided, at the intake end of the pump. The packing at the discharge end of the pump is, therefore, upon thereduced portion of the shaft and may be made more effective.

As shown, the packing 53 at the intake end of the pump is mounted between the protecting sleeve 17 and the body and is yintended to'prevent entrance of air from the atmosphere into the first inlet passage 6, in which, inv the case of a suction pump, the pressure is below atmosphere. It is found in practice that air tends to leak through the packing and break the -partial vacuum in the passage 6 and then through the suctionl line, which consequently causes the Water to drop out of the suction line and break the column of liquid. Such a condition is dangerous and may result in destruction of or great damage to the pump. Furthermore, if air enters the pump and is unequal'ly distributed therethrough the balance of the shaft is disturbed, and as .the shaft often rotates at 3,000 revolutions per minute the bad effects resulting therefrom are magnified or exaggerated. To revent the entrance of air through packing 53,

I therefore, provide a suitable liquid sealv 54 fory the packing through. which liquid may enter and, if the pressure in chamber 6 islow, be drawn into the chamber through the passage between theV shell 13 and protecting sleeve 17. Water seal 54 may be connected, to any suitable source of supply. For example,l if the pump is operating upon acidulous water or other liquid which might have a bad effect upon the material of the packing, it is desirable to connect water seal 54 topa source of supply of pure water. Under normal conditions, however,

when the pump is operating upon harmless liquid, the water seal 54 may be connected to the cover 2 and consist of a small tube leading from an opening 55, tapped through the Wal-l of thefcover, and to the packing .53. The packing 56 at the other end of the shaft 4 may be providedwith a similar liquid seal 57, if desired.

With a pump constructed according to my invention, a single design of pump will accommodate Aitself to a considerable number of systems or conduits. It maybe installed With the shaft upon a horizontal axis and `the inlet and outlet conduits of the system connected to the flanges 26 and 28 on the same side o-r on opposite sides of shaft 4 or, if preferred, conduits mav be connected Aao - charge chamber, an impeller carried by said to each end Ofintake passage 25 and to each end of discharge passage 27. Similarly, if the pump is installed with its shaft 4 in a vertical position, the inlet and outlet conduits may be both on the same side of the shaft, on opposite sides of the shaft, or on both sides 'of the shaft. It will be understood, however, that in case the pump is placed with its shaft 4 in a vertical osition some slight modifications thereo are required, as, for example, in the arrangements for lubricating the bearings.

What I claim is: f

1. A centrifugal pump having a body and a drivingr shaft rotatable therein, said body being formed of a casin and a cover joined on a plane passing t rough the axis of the shaft and being also formed with an inlet chamber, an impeller chamber and a discharge chamber, an impeller carried by said shaftand rotating inl said impeller chamber, said casing being also formed at one end with an intake passage for said inlet chamber and at the other end with a discharge passage for said discharge chamber, one of said passages extending in a direction transverse to said shaft and arranged at each end for connection to the conduits of a system and for securement to a support.

2. A centrifugal pump having a body and a driving shaft rotatable therein, said body being formed of a casing and a cover joined on a plane passing through the axis of the shaft and being also formed with an. inlet chamber, an impeller chamber and a disshaft and rotating in said impeller chamber, saidcasing being also formed .at one end with an intake passage'for said inlet chamber and at the other end with a discharge passage for said discharge chamber, each of said passages extending in a direction transverse to said shaft, vand each being arranged at each end for connection to the conduits of a system and for securement to a support.

3. A centrlfugal pump having a body and a shaft rotatable therein, said body being formed with an inlet chamber, an impeller chamber, a discharge chamber and a discharge passage, an impeller carried by said shaft and rotating in said impeller chamber, said body being formed with an inturned wall between said impeiler chamber and dischargepassage leading the liquid smoothly into the discharge chamber and discharge passage.

4. A centrifugal pump having a body formed with an inlet chamber, an Aimpeller chamber and a vdischarge chamber, a shaft rotatable in said body and carrying an impeller in said impeller chamber, said body being also arranged at one end with a transverse duct forming an intake passage for said inlet chamber and at the other end with .passage for said discharge chamber, sai

forming a transverse beam for supporting said body at the intake end and being provided wlth supporting means adapted for connection to a support, and means for supporting said casing at the discharge end.

5. A centrifugal pump having a body formed with an inlet chamber, an impeller chamber and a discharge chamber, a shaft rotatable in said body and carrying an impeller in said chamber, said body being also arranged at one end with a transverse duct forming a discharge passage for said discharge chamber and at the other end with a duct forming an intake passage for said inlet chamber, said transverse duct forming a transverse beam for supporting said body at the discharge end and bein supporting means adapted or connection to a support, and means for supporting said casing at the intake end.

y6. A centrifugal pump vhaving a body formed -with an inlet chamber, an impeller chamber and a discharge chamber, a shaft rotatable in said body and carrying an impeller in said impeller chamber, said body being also arranged at. each end with a transverse duct, one forming an intake passage for said inlet chamber, and the other forming a discharge passage for said discharge chamber, said ducts forming transverse beams forV supporting said body and being provided with supporting means adapted for connection to a support. v

7.' A centrifugal pump having a body formed with an inlet chamber, an impeller chamber, and a discharge chamber, a shaft rotatable in said body and carrying an impeller in said impeller chamber, said body being also arranged at each end with a transverse duct, one forming an intake passage for said inlet chamber, and the other forming a discharge passage for said discharge chamber, said ducts forming transverse beams for supporting said body and being provided with supporting means adapted for connection to a support, said body being also formed to prvide a free space between said beams and being of symmetrical cross section therebetween.

' 8. A centrifugal pump comprising a body formed with an inlet chamber at one end, a

' discharge chamber at the `other end and an impeller chamber therebetween, a shaft rotatable in said body and carrying an impeller rotating in said impeller chamber, said shaft being of full size at the inlet end of the casing and reduced at the discharge4 end, and packings between the body and the full sized and reduced portions of the shaft, respectively.

9. A centrifugal pump comprising a body formed with an inlet chamber at one end, a discharge chamber at the other end and an provided with Y impeller chamber therebetween, a shaft rotatable in said body and carrying an impeller rotating in said impeller chamber, said shaft being of full size at the inlet end of the body and twice reduced at the discharge end, packings between the body and the full sized and-first reduced portions of the shaft, respectively, a renewable sleeve on the second reduced portion'of the shaft 10 and rotatable therewith, a bearing member in the body in which said sleeve rotates, and interen'gaging parts on said sleeve and member forming a thrust bearing for said shaft.

Intestimony whereof, I have hereunto set my hand. f'

ALBERT E. GUY.

Witnesses:

F. W. WINTER,

ELBERT L. HYDE.

Images