US1652323A - Pump - Google Patents

Description

Dec. 13, 1927. 1,652,323 H I P. A. PETTERSSON PUMP Filed 060.15, 1921v 2 shaves-sheet 1 Swwewtoz 351-. fltfi/AXK/ 1 0720.500

$5 M Gum/nag Patented Dec. 13, 1927.

Iran FSTAT TES i zmiexan irmrnasson ow cmcae imtmors.

7 Application filefl necelnber-15, 1921.. .seriaiflubaszaua' I llhisinvention1relates toviinprovements in' rotary pumps, particularly'of the 'valveless type.

lhe--mainfiobject ofitherinvention is to 5 provide a-pumpingdevice of the character if described with. impelli1ig:memberswhich shall be/sel' f-emptyingat each engagement thereof so as to eliminate 'b'ack surging'ot the fluid acted-upon. 1o Anotheriob'ject is to produce a pmnping devicefot the nature set forth wherein the approaching or contacting surfaces of the fluid impe ll ng members are so proportioned as torhaveldiiferential velocities in order to reducelslippage therebetween. I

' A (further object is the production of a pmnping devicei'of the. type specified having impelling .inemb'ers carrying interchanging elements which shall'be adjustableto com pensat'for wear and capableof being renewed whenYworn beyond adjustment. Still another? object is the provision in a pumping device of the' class mentionedloi sealing means for the stratifying of the slippage on the' sides of the larger and slower moving impeller. V c

TIA-still further object is'to furnish a umping deviceof the kind referred-to, inc nding impellers embodying interengagin i 1 cogfj elements" the-pitch ;circles"whereof s all 'at 1 all times be located below the inlet and out let openings/of the" chambers wherein they operate so as to make themfluid sealed.

, An additional object'is tosupply a pump ing device of the genus alluded to, composed" of few partsfofisiniple, light but strong; and durable construction, readily assembled or. taken apart, convenientlyoperated' as well asieasily repaired, besidesamenable to low. cost of manufacture.

Other objects and advantages of vention will become apparent as the cation proceeds. j o

With the i aforesaid] objects in "view,- the invention consistsfofthe novel combinations" n; and arrangements of parts hereinafter "described in" their "preferred "embodiments, pointed #outin the subljoined claimsg-Pa'nd illustrated on the annexeddrawings, wherein 5 likeip'arts are designated bythe: same refer- 1 i ence characters throughout theseveral views.

' Brieflywdescribed, 1 the invention .under f consideration includesin its organization, a'

provided with intersecting chambers of different-sizes wherein arenmounted to i rot-ate V drum-shaped ,impell;ing; members.

vices may The larger one of these members carries at the circumference thereof spaced cog like elements adapted to engage one at a time with a gap'having the contour'ofthe adja cent flanks IOf a pair "of gear teeth and formed on the smaller impeller. "'Each'of' V the cog-elements is capable of entirely filling thetooth-g'ap so that every ounce of fluid forced "outotl the latter. whereby surging back and forth thereof is prevented'whenthe nnpelhng members are'revolvedffl'lhe outside periph erybf the ismaller member that i also includestl e tobth 'gap' 7 r'otatesi at an interrelatively higher surface speed than the" face of'th'e larger member which, carries the cog-elements, this being conducive to'idecreaseo fslippage between the approaching orcontactingisurfacesof the impellers." The tooth gap ispneferably formed in a shoe whichis removablyseatedin the smaller member soi'thatwhemworn' too much it may be renewed. Similarly the cog elements are disconnectedly attached to the-'Jface of the larger memberin order to". enable the same to be setout to take up wear,"orfor*replacem'ent at such times as it isneeded. 7 For i the purposeofpreventing slippage of'the -fluid on the sides of the larger and V slower revolving member, annular t-ighteners are lodged,-

in ooves'provided therefor; halfway each in" is member and the adj acent walls of the casin the same serv ng to-straitify in a radia :directionthe*fluid'-'around*the shaft which-drivesfthemember; sothat a reduced pressureprevails 'uponthe stufiin boXthru which thi-si shaft "has'to passfi cans are provided-for driving the shafts; by which the impelling members are rotated inperiectcorrelationyand the power for setting themembersin inotiommay be applied to either one of these shafts. The advantages of the invention as here outlined are' -best realizedwhenall of its features and sinstrumentalities are-combined in the one and same structure,- but, usefulde be produced embodying less than the whole;

' It will be obvious 1 to those skilled in the art vtowhich the invention appertains; upon becoming conversant with the; :details thereof; that-the same may beincorporated in several' .diiierent" constructions. The-accompanying" drawings; theiefore, are submitted merely as showing the preferred exemplifi cation of the invention.

' Inthe said drawings:

Figure I is a substantially central longitudinal section 0i a rotary pump constructed according to the present invention; and

Fig. II is a transverse section talten approximately thru the middle of the pump 0115111 l ReTerring now to the said views for a detailed description oi this improved pumping device, the numeral 11 denotes the middle part of the pumps casing or housing, which is divided into two intersecting chambers 12 and 13, of dill'erent diameters. Ports l5 and 16 are formed in the said part ll, preferably at or near the points of intersection of the said chambers, on opposite sides thereof, as clearly seen in Fig. ll. These ports, it is understood, are provided, respectively, for the ingress and egress of the iluid handled by the pump, and may be utilized optionally and intcrciumgcably :lor either purpose, depending upon the direction of motion imparted to the impellers, betorc referred to and hereinafter specifically de scribed.

Following the contour oi the a'ioremen tioned chambers 12 and iii, are outwardly directed flanges 18 and it), the particular function of which will prescntl y appear. As indiiated in the drawing, these flanges are provided at the oapositc ends of the said chambers and maybe cast integral therewith, as well as joining each other. From the lower portions or the flanges 19, project feet 20, respectively positioned two on each side of the said housing 11, and formed with suitable openings to receive bolts wherewit'h the pump is rigidly held, in the approved manner, to a primary support, designated by the reference letter A in the drawing hereto annexed. 3

The ports 15 and 16,.above spoken oi, are widened in their upper portions and also surrounded by flanges 22 and 23, to which are connected inlet and outlet pipes (not shown) wherewith the pump is furnisl'ied, as usual. The piping, of course, may lead to and from any convenient direction.

Heads 35 and 36 are placed against the outer faces of the aforesaid flanges 18, i9, and the corresponding ends of the chambe 12, 13. These heads may be held in position by any suitable tastenings, such for instance as cap screws or.

Hollow bosses 39, 4:0 and ll, i2 are provided in pairs on the said heads 35, 36, the same being in alignment with the centers otthe chambers 12, .13, respectively, and adapted to support shafts i3, ll, revolvably therein. The bosses 39 and all, on the head 35, are closed at their outer ends, as denoted by i5 and lti, in Fig. II, on the leitchand side, Whereas the bosses 4:0 and 42 are outwardly open, as represented in the same view, on the right. The latter-named bosses are internally enlarged to provide stullmgpropriate contrivance known in the art may be employed ior that purpose. At 51 and 52 are indicated reinforcing ribs that radiate from the several bosses 35), 4:0, 4:1 and +12, otu wardly toward the edges of the heads 35 and 36.

Revolvably contained within the chambers it 13 between their said heads 35, 36, are rotatable members 53, The lattecare allixed to the shafts 4:3, 44, previously mentioncd, as by keys 5:"), 56, and set-screws 57, 5b.

()t' the said members, sealin rotor 53 is the smaller and consists, pre erably, of a solid body into which is cut an axially parallel gap or channel 60, that conforms in shape to the normal space intervening between the adjacent flanks of apair of gearteeth. As shown, the gap 60 may be formed in an open shoe (J1, fitting tightly in a corre spond ingly-shapral recess provided in one side of the member 53. The sides of the shoe that; come into contact with the adjacent parts of the recessed member, it will be noted, are given a double transverse taper so as to retain the same firmly, after being driven endwise into position. The shoe 61 may be made of libre, Babbitt metal, or any other andhub portions of which are united by an approximately central web 63. At specified distances apart in the rim of this member,

are provided transverse grooves 64:, each of which ali'ords a seat for the base 65 of a gear toothtSGQ 13y preference, three gear-teeth 66 are applied, equidistantly as shown, tothe. circumference of the member 54, and they jointly and severally constitute the impellers hereinbeiore mentioned. These gear-teeth are spacedapart from each other in con! tormity with the lengtho't pitch-line of the tooth-space supplied by the gap 60, in the member 53. i

In the outer ends of the said gear-teeth 66, are ilormed sealing grooves 67, arranged to receiveeach a small portion of the liquid which being pumped. This serves as a tightening, packing or sealing medium in re ducing the r-alippage as well as eliminating by 'i'riction at the point oi juxtaposition with the casing or housing 13. The several gearteeth are secured, at the base 65, each by a screw-bo]t, as 69, driven thereinto from the inner face of the rim of the member 54.

Shims 70, of tin tlfoil or the like, may be interposed between the bottoms of the grooves 64, and the bases of the gear-teeth 66 seated therein. Provision is thus made radially masses for setting out any 1 one or all of the gearteeth, as required, to properly yuxtapose their outer or top surfaces withrespect to the inner sur-facesoffhe casing'13, to the-desired extent. r

At 72, is maimed 5' dished I washer,

throughwhich passes the screw bolt 69, that maintains" the gear-tooth G6 in --p'osition,

of -metal or other suitable material, are

lodged in'gmoves provided therefor in the rimand hub portions yofthe saidmember, as also in the contiguous parts of theheads I and 36,- oppositethe same; The rings, it

will be noticed, extend substantially half-way v each into the corresponding grooves of the member and itsheads. The double annular packing thus provided serves to diminish the pressure to which the stuffing-box 48, for the shaft 44, is subjected.

Considering that the external circumference of the member 53 coincides with the outer extremities of the gear-tooth flanks bounding the gap 60, and this circumference has a rolling or approaches a rolling contact with the outer face of the rim ofthemember which is also the base or foot circle'ofthe' gear-teeth 66, it is clear that these surfaces 7 pass eachother at a difl'erential'rate of speed,

since the coacting circularpitch lines of the gap and teeth 66 move together at the same Velocity. This feature of construction,

. it has been demonstrated in practice, reduces to a minimum the back slippage of the fluid which is being transported between any twoof the gear-teeth or impellers 66, from the port 15, around the chamberlii, to the port 16, or viceversa. j j 7 Upon the shafts 43 and 44, at'a certain distance from the glands 49 and 50 thereon, are fixed a pinion one into the other. The coacting pinion and ear, it will be noted, are sufflciently distant rom the glands to allow the latter all needed accommodation incidental to the packing of the stuffing-boxes 47 and 48, and they are maintained in position by suitable keys and set-screws as shown. The ratio ofthe pinion 77 to the gear 7 8 :is the same as the proportion existing between the size of the gap 60,

in the member 53, and the number of teeth.

66, on the member 54. In practice, the ratio of 1 to 3 has been foundto give excellent results. p i

' The outer ends of the shafts43 and 44 are journalledin bearings 80, 81 formedwith a onihe rim of the member -54. It"

77 and gear 78, meshing frame or bracket 82, the-basal portions/83 whereof stand 1 upon the primary support A. Either one of these shafts, it} is understood,

canbe driven by power derived from'anyf convenient-source, for instance'by means of a pulley-and belting, or through the instrumentality of any preferred form. of powertransmitting mechanism.

With the View of taking end strains off the member-.54, a collar 84 isseeuredtothe. shaft 44, so as tobear against'the outer face of the bearing 8.1:thereof, in opposition to the hub part. of the gear 78. The. power is. applied,"

preferably, to the extrennty of the shaft, 43 or 44, that projects beyond the outer bearing, 01-181.

The. operation of the improved rotary pump-herein described is perfectly obvious to any expert in the art looking overthe fore going specificatiom'with the accompanying drawings, and therefore no time wasted in setting forth the same. to say that'the device embodying the present invent-ion is of an essentially practical character, and fully capable of realizing the objects-and vresults for which it has. been produced.

While a certain preferred embodiment of this device has beenshown and described,

it will be understood that changes in the form, arrangements, proportions, sizes and details thereof may be made, without departing from the scopeof the invention as defined by the appended claims.

Having described my invention what I desire to secure by Letters Patent and claim, .1s: I 7 v 1. A'rotary pump comprising a casing.

having a chamber, an impelling rotor in the chamber, mist and outlet passages, a sealing rotor cooperable with the impelling rotor willfbe Suffice it 7 on i for effecting flow of fluids through the pump, said sealing rotor comprising a body portion provided with a gap in a peripheral L port-ionthereof, and a shoe of rigid mate-V rial in said gap.

2. A rotary pump. comprising a' casing having a chamber, an impelling rotor in the chamber, inlet and outlet passages, a sealing rotor cooperable with the impelling rotor'for effecting flow of fluids through the pump,

said sealing rotor-comprising a body portion v 7 provided with a ga in a peripheral portion thereof, a 'recesse shoe in said gap, the

walls of the recess portion of said shoe adapted to constantly engage with the impelling rotor portion cooperating therewith to prevent fluid slippage.

3. A rotarypump comprising a chamber, an impelling rotor in the chamber, inlet and outlet passages, a. sealing rotor cooperable with the impelling rotor for effecting flow @Of fluids through the pump, said sealing rotor comprising a body portion having a gap, the shoe in said gap causing cooperation with a portion ofsaid impellingrotor, said shoe having a double transverse taper Whereby it may be firmly retained in the gap of the sealing rotor.

4. A rotary pump comprising a chamber, an impelling rotor in said chamber and having impellingelements, inlet and outlet passages for the chamber, a sealing rotor having a gap in which said elements areadapted to extend when the rotors are 0 rated, a recessed shoe in said gap, the. si e portions of the shoe being curved to cooperate with the side faces of said elements for efl'ecting a continuous scaling and prevent fluid slippage. I

5. In a rotary pump, cooperable rotary members,one of said members having a gap, the other of said members having adjustable elements "cooper-able with said gap, means for adjusting said elements and means for holding said elements and adjusting means in place.

6. In a rotary pump, cooper-able rotary members, one of said members having an impeller-engaging gap and the other of said members having an impeller element cooper able with said gap, said gap being formed m a shoe of rigid material detachably con-;

mg to and and means for holding the cogs rigidly m adjusted position. a

a chamber,

an impelling rotor in g 8. In a rotary pump having a chamber and a rotor therein, an nnpelling member carried by the rotor, shims the position of the member, means for holding the member in shimmed posltion.

9. In a rotary pump havin a chamber and a rotor therein, an impel ing member carried by the rotor and extending into a groove provided in said rotor, shims placed 111 said groove and behind said member for adjusting the member, and a bolt secured to said member and to said rotor for holding the member and shims in place.

PEHR AXEL PETTERSSO N.

for adjusting and securing CERTIFICATE OF CORRECTION.

Patent No. 1,652,323. Granted December 13, 1927, to

PEHR AXEL PETTERSSON.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 18, for the word "interchanging" read "'interengaging"; page 2, line 122, for the word "by" read "any"; and that the said Letters Patent should be read with these corrections therein that the same 'may conform to the record of the case in the Patent Office.

Signed and sealed this 14th day of February, A. D. 1928.

M. J. Moore, Seal Acting Commissioner of Patents.

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