US2586964A

US2586964A - Rotary pump

Info

Publication number: US2586964A
Application number: US698907A
Authority: US
Inventors: Jr Frederick Kraissl
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-09-24
Filing date: 1946-09-24
Publication date: 1952-02-26
Anticipated expiration: 1969-02-26

Description

Feb. 26, 1952 F. KRAissl., JR 2,586,964

ROTARY PUMP Filed Sept. 24, 1946 2 SHEETS- SHEET l ,95) 3j @NA/9 ATTORNEYS Feb. 26, 1952 F. KRAlssL, JR 2,586,954

ROTARY PUMP Filed sept. 24, 194e 2 SHEETS-SHEET 2 ATTORN EYS Patented Feb. 26, 1.9.52

UNITED STATES PATENT OFFICE ROTARY PUMP Frederick Kraissl, Jr., North Hackensack, N. J. Application September Z4, 1946, Serial No. 698,907

(Cl. S- 136) 2 Claims. 1

This invention relates to improvements in rotary pumps and has for a principal object the provision of a rotary pump in whichk the main wearing surfaces are oatingly in-dependent of each other and adapted to be removed and replaced manually, thereby enabling the user to remove the worn parts of the pump and replace them with the new ones without having to replace the entire pump per se.

Another object of the invention is the provision in the rotary pump of a rotor having roller slots 120 apart, thereby enabling the pump cylinder to be bored on a true circle. By this arrangement, the urge to rotate the rotor is the same throughout the 360 of roation, and no tight place is encountered as is the case in rotors employing a larger number of blades or rollers.

Yet lanother object of the invention is the provision in the rotary pump of a shaft, the diameter of which is the same throughout its length, a rotor secured to said shaft and having counterbored portions on each end thereof, rings oatingly positioned in said counterbores, rollers iloating in slots formed in said rotor, said rings and said rollers being of such diameters that the sums thereof, when in proper relation, are substantially equal to the bore of the cylinder in which the said rotor, the rollers kand said rings rotate, thereby maintaining rolling motion of the rollers against the bore of the cylinder at all times; special advantage being obtained whereby the rollers and rings are caused to revolve continuously, keeping all wear at a minimum.

In order to keep the rolling action of the rollers as even as possible, when they pass the suction and discharge ports, said ports are spanned by V-shaped webs, thereby keeping the pressure substantially constant throughout the length of the rollers and reducing any tendency to skid and thereby obviating uneven wear both on the rollers and in the cylinder bore.

Yet another object of the invention is the provision in a rotary pump of a rotor having a plurality of slots formed therein and replaceable wear plates set into the trailing faces of said slots, said plates being adapted to be removed and replaced after their outer surfaces become worn.

Another object of the invention is the provision in a rotary pump of a shaft which extends from both ends thereof, said shaft being provided with stuii'ing boxes near each end thereof, and bearing means supported on said pump and engaging the shaft beyond said stuiiing boxes.

Other objects and advantages of the invention will be apparent to those skilled in ther artupon a study of the lfollowing specification,v andk the accompanying drawings.

In the drawings, which are given merely by Way of example to illustrate the invention:

Figure 1 is a front .elevation of my new and improved rotary pump;

Figure2 is a sectional elevation of the pump shown in Figure 1;

Figure 3 is a sectional elevation ofthe pump as seen along the lines 3 3 .of Figurel;

Figure 4 is a sectionalelevation of the pump cylinder alone as seen along .the lines ll, 4 of Figure 3,. showing ,the discharge or exhaust port of my` newvand improved pump; .and

Figure 5 is a perspective view of the rotor of my new and improvedpump, showing one method of mounting the wearing plates in the trailing faces of the slots in said rotor.

Referring first to Figures 1 and 2, my new and improved rotary pump includes a body I Ahaving a cylinder Il with flanges l2 and I3 at each end thereof.

Formed integral with the flanges i2 and i3, at the bottom thereof, is a mounting base ill which may include mounting holes i5.

The cylinder bore is indicated ati6. The cylinder has an inlet boss Il having an inlet passage ila formed therein. The cylinder also has. an outlet boss I8 and an outlet passage I8a formed therein, as maybe seen inFigure 3. The

vpassage lla communicates with the interior of a swiveled fitting i 9 which is secured to the boss I1 by means of a screw 2l. The upper endof the fitting i9 may terminate in a flange ISa for connection to any point of use. The passage Ita U.communicates with the interior of a swiveled fitting 2B which is secured to the boss I 8 by means of a screw 22. The inlet passage lla terminates in the wall of the cylinder to form a port 23, which may be termed the inlet port. Likewise, the passage Ita terminates in 'a port 24, which maybe termed the discharge or outlet port, and the fitting 20 maybe provided with a flange 29a for connection to a point of use.

In Figure 4, they discharge port may consist of

openings

25, 26, and 2l, with Webs 2B and 29 therebetween. The combination of the

webs

28 and 29 cooperate with the cylinder bore i6 to present additional surface to the rollers (to be presently described) for the purpose of equalizing the wear Ion these rollers. The inlet port 23 may be formed in the same manner or it may be varied in accordancewith the conditions under which thev pump is to operate and/or the Inaterial which it is to handle,

Turning to FigureY 2,.,then pump isprovided with a shaft 3B which, it will be noted, is preferably the same diameter throughout its length. This eliminates the necessity for stepping the shaft to form shoulders thereon. An end plate 3| has a face 32 which abuts the flange l2 and has formed integral therewith a boss 33. Spaced apart from the boss 33 is a larger boss 34 which is joined to the end plate 3| by means of ribs 34a, and 34h. The boss 33 is provided with a bore 33a through which the shaft 30 may pass and concentric therewith is a counterbore 35. At the bottom of the counterbore 35 is a beveled ring 36 which is connected through a passage (not shown) in the end plate 3| to the suction side of the pump, thereby reducing the pressure on the stung box to a pressure lower than atmospheric pressure. The stuiing box includes a gland 3l and between the gland 3l and the ring 36 is suitable packing 38. Suitable means is provided for urging the gland 3l to the left, as seen in Fig. 2, but since such means is old in the art, it need not necessarily be shown.

A second end plate 3S is identical with end plate 3|. It has a face 43 which seats against the flange I3, and thus the end plates 3| and 39 enclose the cylinder 'bore I6. The end plate 35 has a boss 4| formed integral therewith and spaced apart from this boss is a second boss 42, which is larger in diameter and which is joined to the end plate 39 by means of ribs 42a. and 42h. The boss 4| has a hole 43 therein, through which the shaft 30 extends and this boss has a counterbore 44 to accommodate a stuing box which may include a ring 45, the beveled inner face oi which communicates with the suction side of the pump.

' Mounted in the counterbore 44 is a gland 43, and

suitable packing 41 is employed between the gland 45 and the ring 45.

Secured on the shaft 30 is a rotor i8 which generally cylindrical in form, as may be seen in Figure 3. The rotor is keyed or otherwise fixed to the `shaft and moves therewith.

Formed in the rotor are slots 49, 55 and 5|. These slots are substantially 120 apart and the sides of the slots are of such width that

rollers

52, 53 and 54 mounted in these slots in the order named, form working ts therewith.

Referring again to Figure 2, the rotor has a counterbore 55 formed therein in one end thereof and a second counterbore 56 formed in the opposite end thereof. Positioned within these counterbores are respectively ring members l and 58. These ring members are of such diameter that when the three rollers are in contact with the cylinder bore I5 they may be slipped between the rollers and they function to keep the rollers out near or in contact with the cylinder bore at all times.

From a study of Figure 3, it will be obvious that as the rotor 48 is rotated in a counterclockwise direction, the fluid medium being handled has just been trapped between the rollers 54 and 52, the bore I6 of the cylinder, and the outer periphery of the rotor between the rollers 54 and 52. As the rotation continues the space described decreases until a point is reached where the roller 52 uncovers the lower edge of the discharge port 24, with the result that further rotation of the rotor causes substantially all of the fluid medium confined within the space defined above to be discharged into the passage |8a via the discharge port 24. By this time, the

rollers

54 and 53 have trapped a like volume of the ud medium and as the rotation continues and the roller 54 uncovers the port 24, the medium is discharged into the passage |811. Thereafter, a third volume of fluid medium is trapped between the rollers 53 and 52 and subsequently, this ud medium will be released into the passage |8a as the roller 53 uncovers the port 24. etc.

In Figure 3, the roller 53 is shown as having traveled its maximum distance into the slot 5G. When the roller 54 reaches the bottom of the cylinder bore with its center in line with the center of the cylinder, the roller 54 will have advanced outwardly in the slot, its maximum distance, and as it passes the center and moves to the right (direction of the arrow), it again is moved toward the bottom of its slot.

I have found that by inserting wear plates. such as wear plates 59, 50 and 6| in the trailing faces of the slots 49, 53 and 5|, these plates get the brunt of the wear and may consequently be made of material capable of withstanding hard wear. These wear plates are inserted endwise in slots such as the slots shown in Figure 5, wherein the shallow slot 62 is formed in the trailing face of the blade slot 5|. rlhe slot 52 has its inner end 53 beveled. Communicating with the slot 52 is a deeper and narrower slot |34. The wear plate 5| has its outer edge 65 conforming to the outer diameter of the rotor. The body 55 of the plate is of s-uch thickness that when the plate is mounted in the slot 62 formed in the face Sia oi the blade slot 5|, its outer surface is flush with the surface 5 ia.

integral with the plate 5| is a portion 5i which is beveled and which cooperates with the beveled groove 53. Also integral with the plate 5| is a tongue portion 58 which forms a working fit in and cooperates with the slot E4. This plate is slid in endwise and is locked in position by the beveled portion 61 and the tongue portion 58, and it cannot get out of the rotor endwise unless an end plate is removed and the rotor is removed from the pump.

Referring again to Figure 2, the boss 34 has a hole 69 formed therein concentric with the shaft 30, and from the outer end the boss 34 has a counterbore 'IB formed therein to accommodate the outer race 'l2 of a ball bearing 1|. The ball bearing has an inner race 'i3 which forms a fit on the shaft 35 and extends beyond the ball bearing to carry a sleeve 14. Threadedly engaging the sleeve 14 is a screw 75, the point of which extends through a clearance hole formed in the extension vof the inner race T3.

Likewise, the boss 42 has a hole l5 which is concentric with the shaft 35 and from the outer end, the boss has a counterbore 'il' formed therein to accommodate the outer race i9 of ball bearing 78. The inner race 83 of this ball bearing extends beyond the ball bearing to accommodate a sleeve 8|. The sleeve 8| has a threaded hole formed therein to accommodate a screw 32 and the point of the screw extends through a clearance hole in the inner race 8B so that the point of the screw may engage the shaft 35.

It will be noted that the holes B9 and 16 are of sufficient diameter to permit the heads of the glands 46 and 3l, respectively, to pass therethrough. The end plates 3| and 33 are secured to the pump body by means of screws 83.

The fittings I9 and 23 secured to the pump body by means of screws 2| and 22, respectively, form swivel ts with the .pump body and by loosening the screws 2| or 22, either or both of the fittings may be swung to any angle desired, and thereq fore the connection between the inlet and outlet ports and the point of use is facilitated. The pump body, it will be noted, is ribbed to make it very light in weight, and yet substantially strong structurally. A central web 84, Figure 3, joins the cylinder wall and extends down into a horizontal web 85, which may contain the holes l5 for the mounting screws.

Although I have herein shown and described by way of example one embodiment of my new and improved rotary pump, it is obvious that many changes may be made in the arrangements herein shown and described without departing from the spirit of the invention as set forth in the annexed claims.

What is claimed is:

1. In a rotary pump, a body having a cylindrical bore therein and inlet and discharge ports communicating therewith, end plates forming closures therefor, said end plates carrying bearings eccentric to said bore, a shaft mounted in said bearings, a rotor xed on said shaft and having a plurality of blade slots formed therein, blade means in said rst slots adapted to cooperate with said bore; said blade slots having cut-out portions in the form of comparatively radially shallow slots, each having its radially inner edge beveled, and a radially narrower slot extending in the same direction from said blade slot and radially communicating with said shallow slot intermediate its )zo radial inner and outer edges, a hardened and ground wear plate in and forming a working t with each cut-out portion, each plate having: an outer edge conforming to the outer diameter of the rotor, a beveled inner edge which mates with the inner edge of said shallow slot, and a, tongue portion which cooperates with and forms a working t in the said deeper slot; the blade contacting surfaces of said wear plates also being flush with the side surfaces of said blade slots, and locked against lateral movement by the form of the cut-out portions and maintained therein longitudinally by contact with said end plates when said pump is assembled, said wear plates being removable manually by merely sliding them A endwise in said cut-out portions when said pump is disassembled.

2. Ina rotary pump, a body having a cylindrical bore therein and inlet and discharge ports communicating therewith, end plates secured to said body and forming closures therefor, said end plates carrying bearings eccentric to said bore, a shaft mounted in said bearings, a rotor xed on said shaft and having longitudinal blade slots formed therein, the trailing faces of each blade slot having a second slot formed therein substantially shallower radially than said first slot, said second slot having its radially inner end beveled, a third slot communicating with said second slot extending in the same direction from said blade slot and radially narrower than said second slot, a hardened and ground wear plate of a shape to conform to and adapted to be manually slid into said second and third slots endwise; the face of said wear plate being flush with the face of said rst-mentioned slot, the radial outer edge of said wear plate conforming to the outer diameter of said rotor and the inner edge being beveled to match the inner beveled edge of said second slot; said wear plates being retained in said second and third slots by said end plates when said pump is assembled, and blades mounted in said slots and adapted to cooperate with said bore.

FREDERICK KRAISSL, JR.

REFERENCES CITED The ,following references are of record in the i'ile of this patent:

UNITED STATES PATENTS Number Name Date 462,282 Sperry Nov. 3, 1891 582,696 Schneible et al. May 18, 1897 1,043,936 Hope Nov. 12, 1912 1,111,160 Larsen et al Sept. 22, 1914 1,265,070 Feyzes May 7, 1918 1,553,095 Moore Sept. 8, 1925 1,737,942 Pagel Dec. 3, 1929 2,003,615 Smith et al June 4, 1935 2,036,711 Martin Apr. 7, 1936 2,338,609 Whittaker Jan. 4, 1944 FOREIGN PATENTS Number Country Date 2,646 Great Britain 1885 142,858 Great Britain May 6, 1920 228,264 Great Britain Feb. 2, 1925 278,382 Great Britain Dec. 22., 1927 304,574 Great Britain Jan. 24, 1929 310,580 Great Britain May 2, 1929 404,337 Great Britain Jan. 15, 1934 722,961

France Jan. 8, 1932