US2446194A

US2446194A - Pump construction

Info

Publication number: US2446194A
Application number: US496693A
Authority: US
Inventors: Samiran David
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-07-30
Filing date: 1943-07-30
Publication date: 1948-08-03
Anticipated expiration: 1965-08-03

Description

v 7 Aug. 3, 1948.- b. SAMIRAN 9 5 4 PUMP CONSTRUCTION Filed July 30, 1943 2 Sheets-Shut l I f Q g 1948- 1 D. sAMlRAN 2,445,194

' ruur cous'muc'non Filed July 30, 1943 I 2 Sheets-Sheet 2 04400 4 SAM/9 4 raAuve y;-

Patented A 1-948 w UNITED STATES PATENT OFFICE; 2,440,194

' rum cons'muc'rron David Samiran, mm, om Application July so, 1943, Serial No. 498.898 Claims. (01.103-126) I (Granted under the act of March 3, 1883, u

The invention described herein may be menu-- factured and used by or for the Government for metric output of the pump with a minimum degree of friction between the rotary parts of the pump and the pump casing.

A further object is the provision of capillary fluid collection sealing means for rotary impeller pumps, formed in the inner surface of the pump casing so that the impeller or rotor means may be disposed to move in juxtaposed closely spaced relation to the inner surface of the pump housing without frictional contact between the rotor and interior of the casing, the sealing means reducing the fluid leakage between the rotor and the inlet and outlet sides of the pump, thus effecting ease of operation, efficiency in the fluid delivery outputof the pump, and economy in the manufacture, since the inner wall of the casing and peripheral portions of the impeller means are out of actual contact, a minimum amount of machining operations only are necessary in the manufacture or the assembly of the pump.

Other objects and advantages of the invention will be apparent, as set forth in the following description, taken in connection-with the accompanying drawings, in which like reference characters refer to like parts in the several flgures.

Fig. 1 is a vertical sectional view taken through a rotary impeller type-fluid delivery pump having my improved labyrinth fluid sealing means incorporated therein, certain of the parts being shown in elevation.

Fig. 2 is a cross sectional view through'the pump shown in Fig. 1, certain of the parts thereof being shown more or less in elevation.

In the drawingsthe numeral I indicates a pump casing or housing, as best seen in Fig. 1, having spaced semicylindrical side walls 2 and 8, and parallel end walls 4 and 5, the end wall I comprising one face of the removable closure or cover plate Gfiwhich is secured to the housing proper by suitable fastening means, such as cap screws 1. y W

Referring now to Fig. 2, the housing is provided with substantially aligned fluid inlet and outlet ports 8 and 9, opening into the casing beamended April 80, 1928; 370 O. G. 157) tween the ends of the semioylindrical side walls 2 and I, and inlet and outlet screens Ill and H are disposed across the aforementioned ports to prevent the passage of foreign matter through the pump. 1 A flanged fluid supply nipple or hose connection I! is secured across the inlet port, and a threaded outlet flange II is similarly secured across the outlet port by suitable fastening means, as indicated at ll.

Supporting feet. or standards l5, are formed on the base of the pump hcusing, which may be suitably recessed and threaded to secure the punzlp in a suitable fixed position for use as desire The semicylindrical inner side walls 2 and 3 have their central axes at vertically spaced points, as indicated at It and fl, and the inner arcuate surfaces of the semicylindrical walls are provided with a plurality of equally spaced, substantially parallel capillary fluid collection sealing grooves i8, terminating just short of the opposite end walls 4 and I. These end walls I and 5 are also provided with a plurality of capillary fluid collection sealing grooves i9, extending radially from the axial centers l6 and H, in

alignment with the parallel grooves IIB afore- 7 sockets, which also have their centers concentric to the axes I6 and IL Suitable grease gun flttings of'the Zerk" type are provided for introducing lubricant into the last mentioned re-- cesses.

A vent opening 25' is formed in the end wall 4,

adJacent the outer port 8 to permit the passage of fluid through this wall into the gear casing,

7 later to be described. 4

'Interengaging impeller members, indicated generally at 26 and 21, are provided, as seen in the drawings, these impellers being constructed in substantially the same manner, with the exception of the driving gear arrangement, and the same reference numerals are therefore applied to most of the detail constituent parts of both impellers. videdwith

stub axle shafts

28 and 29, extending from the ends thereof,'on which are mounted Each of the impellers is proto the integral side wall :operating handle project the

stub axle shafts

28 and 28. Each barrel has secured to the opposite sides thereof, in diametrically opposite relation,,a pair of T-rshaped impeller heads or blades 34, having arcuate peripheral surfaces 35 arranged to move in closely spaced juxtaposed relation to the interior semicylindrical side wall surfaces 2 and 3 of the housing I. These head members 34 are secured in place on the

cylindrical barrels

32 and 33 by pins or rivets 36, and the headed ends 31 ofthe rivets are secured in flush relation with respect to the arcuate peripheral surfaces 35 of the said heads or blades 34.

Each of the cylindrical barrels 3'2 and 33 is provided with a longitudinally extending eccentrically mounted grease delivery tube 38 extending from a point adjacent the antifriction bearfriction bearing 3|, so that grease forced under pressure through the fittings 24 may be delivered to both sets of antifriction bearing members. The upper stub axle shaft 29, as seen in Fig. 1, extends through and beyond the end wall 4, and carries fixed thereon a large drive gear 39, and a similarly fixed smaller driving gear 40. The

a second. large gear 4|, meshingwith the aforementioned gear 39, and identical in size to the last mentioned gear.

The two rotors 28 and 21 are disposed with their impeller blades or heads 34 in a 90 out-of-phase relation so. that the arcuate surface 35 of one of the blades will always be in alternately light wiping contact with the cylindrical surface of one of the

barrels

32 or 33 of the opposite impeller member, and the two large gears 39 and 4| maintain this relatively fixed out-of-phase interengaging pumping relation between the two impellers.

It will be noted that as the peripheral surfaces 33 rotate past the grooves l8, and as the head members 34 rotate past the grooves It, the entire length of the capillarygrooves l8 and I9 come again in contact with the fluid being pumped, and that the entire length of each capillary groove is completely filled immediately prior to the passing of the rotors. f

A cover plate or bell-shaped gear housing closure 42 is suitably secured, as indicated at 43, portion 4' of the pump housing, and this closure is provided with an inral sleeve extension 44, through which extends the drive shaft 45, mounted on the needle or roller bearings 46 and 41, carried in the sleeve extension. Grease gun fittings 48 are provided to supply lubricant to the needle bearings, and a suitable packing gland member 49 is interposed between the bearings 46 and 41 to prevent leakage from the casing of the fiuidbeing pumped. The end of the drive shaft 45 extending into the bellshaped gear housing to a point adjacent the lower large gear H has fixed thereon a large driving gear 50 meshing with the small driven gear 40 on the upper impeller stub axle shaft 29. An I is secured to the end of the drive shaft 45, projecting through the sleeve extension 44 to the exterior thereof.

' Byutilizing the capillary. fluid sealing grooves in the arcuate side and parallel end walls of the housing, I provide an effective fluid collection labyrinth seal between the inlet and outlet ports and 22 and 2t and 23,

4 Q I so that the impellers 26 and 21 may be constructed with a free running fit with respect to the end and semicylindrical side walls of the housing, with a relativeclearance therebetween of as much as a thousandth of an inch. This makes it possible to reduce the degree of precision machining of parts which is necessary where the parts are in the in; to a point adjacent the face of the antiet al., which discloses a rotary impeller pump of lower stub axle shaft 29 also has fixed thereon usual actual wiping contact, and the labyrinth fluid sealing structure reduces leakage between the inlet and outlet ports past the impellers to a minimum, thus providing a pump structure that is extremely efiicient in its volumetric output, and operable with a minimum degree of friction and effort. The pump is entirely enclosed and substantially frictionless with the exception of the slight Wiping contact between the arcuate surfaces of the rotors, and the friction of the packing or sealing gland 49 on the drive shaft 45. While I have described the pump as operating with definitely located inlet and outlet ports, it is obvious that the pump is fully reversible by merely turning the crank handle in the opposite'direction.

For the actual operation of the impellers of the pump, reference may be had to Patent 2,262,231,

issued on November 11, 1941 to F. W. Guibert,

somewhat conventional form, having impeller heads or blades similar in general shape to that disclosed in my improved pump. In this patent, the periphery and ends of the impeller blades are arranged to move in wiping contact with the end and Side walls of the pump housing, requiring precision machining of parts in order to reduce leakage, and the relative friction between these parts is suflicient to make a pump of this type, without my improved construction incorporated therein, very diificult to operate, which soon causes inefliciency in fluid delivery output as the parts become worn, due to this friction.

Having thus described a specific embodiment of my invention for illustrative purposes, what I claim as new, and desire to. secure by Letters Patent, is:

1. In a rotary fluid pump pumps of the class described, a closed casing having parallel end walls and a pair of spaced semicylindrical side walls facing each other with substantially aligned inlet and outlet ports formed in the casing intermediate the adjacent ends of the curved surfaces of the semicylindrical walls, said semicylindrical walls having a, plurality of spaced substantially parallel capillary fluid collection grooves formed therein extending without interruption in their length substantially longitudinally to the axes of the semicylindrical walls to points adjacent to and spaced from each of the parallel end walls of the casing.

2. A rotary fluid pump casing for pumps of the class described, comprising a closed casing having parallel end walls and a pair of spaced semicylindrical side walls facing each other with substantially aligned inlet and outlet ports formed in the casing intermediate the adjacent ends of the curved surfaces of the semicylindrical walls, said semicylindrical walls having a plurality of spaced substantially parallel capillary fluid collection casing for impeller ward the parallel fluid collection grooves formed in the semicylindrical side walls of the casing and terminating at points adjacentto and spaced radially inwardly from each of the semicylindrical side walls to leave adjacent unobstructed end and side wall portions at the juncture between the semicylindrical side walls and each of the parallel end walls, extending between the adjacent inlet and outlet ends of the casing.

3. In a rotary fluid pump of the class described, a closed casing having parallel end walls and a -pair' of spaced semicylindrical side walls facing 'ing a plurality of substantially parallel capillary continuous intermediate wall comprising a pair of spaced semicylindrical side walls facing each other with intermediate connecting walls having substantially aligned inlet and outlet ports formed therein intermediate the adjacent ends of the curved surfaces of the semicylindrical walls, said semicylindrical walls having a plurality of substantially parallel capillary fluid collection liquid sealing grooves formed therein between the ends thereof extending substantially parallel to the axes of the semicylindrical walls, each groove terminating at its ends adjacent the adjoining parallel end walls of the casing in spaced relation thereto, said parallel end walls having a plurality of capillary fluid collection grooves formed therein and extending substantially radially outward from the axial center of the semicylindrical walls of the casing in radial planesp'assing through the capillary grooves formed in the inner semicylindrical surfaces of the casing and terminating in radially inwardly spaced relation to the first mentioned grooves, and interengaging rotary impeller pumping means within the casing operable in closely spaced relation to said side and end walls past said capillary fluid collecting grooves and the ungrooved portions of the side and end walls intermediate the adjacent ends of the grooves in the end and side walls. a

4. In a rotary fluid pump casing for pumps of the class described, a closed casing having parallel end walls and a pair of spaced semicylindrical side walls facing each other with substantially aligned inlet and outlet ports formed in the casing intermediate the adjacent ends of the curved surfaces of the semicylindrical walls, said semicylindrical walls each having a plurality of substantially parallel capillary fluid collection liquid sealing grooves formed therein extending substantially equally spaced around the walls between the ends thereof parallel to the axes thereof to points adjacent to and spaced from the adjoining parallel end walls of the casing, said parallel end walls having a plurality of capillary fluid collection grooves formed therein and extending substantially radially outward from the axial center of the semicylindrical walls of'th'e casing in radial planes passing through the capillary sealing grooves formed in the inner semicylindrical surfaces of the casing, said longitudinal and radial sealing grooves having their adjacent ends terminating opposite each other in spaced relation to,

leave the adjoining side and end wall portions of the casing uninterrupted.

5. In a rotary fluid pump of the class described, a closed casing having parallel end walls and a fluid collection liquid sealing grooves formed therein extending substantially longitudinally of the semicylindrical walls parallel to the semicylindrical walls to points spaced from and adjacent to the adjoining parallel end walls of the casing, said parallel end walls having a plurality of capillary fluid collection grooves: formed therein and extending substantially radially outward from the axial center of the semicylindrical walls of the casing in planes passing through the capillary grooves formed in the inner semicylindrical surfaces or the casing. terminating adjacent to and radially inwardly of the semicylindrical side walls, and interengaging rotor impeller fluid pumping means parallel end walls with their axes concentric to the radial centers of the semicylindrical walls of the casing and having spaced substantially similar arcuate surfaces arranged to move past the aforesaid substantially parallel capillary fluid collection liquid sealing grooves in closely spaced relation to the semicylindrical walls aforesaid, between the inlet and outlet ports in the casing, said interengaging rotary impeller fluid pumping means having parallel end surfaces adjoining the arcuate surfaces thereof and disposed to move past the substantially radially disposed capillary fluid collection grooves'in the parallel end walls of the casing in closely spaced fluid sealing relation thereto. with the edges of the impellers at the juncture between the arcuate surfaces and the adjacent parallelend walls disposed to move in closely spaced relation past the adjacent ungrooved portions of the casing located between the adjacent ends of the parallel fluid collection liquid sealing grooves and the outer ends of the radially disposed capillary fluid collection grooves.

DAVID SAMIRAN rtsrnnnncns crrnn file of this patent:

' UNITED STATES PATENTS journaled in the casing in said