US2377299A - Rotary pump - Google Patents

Description

y 1945. A. VON WANGENHEIM 2,377,299

ROTARY PUMP Original Filed Nov 19,, 1942 FIG. I

FIG 4 LUINVENTOR M ATTORNEY.

Patented May 29, 1945 UNITED STATES PATENT OF FICE ROTARY rum Adolf von Wangenhcim, Detroit, hitch. assignor to Detroit Lubricator Company, Detroit, Mich, a corporation of Michigan Original application November 19, 1942, Serial no.

Divided and this application March 1c, 1944, Serial No. 526,750

Claims. (circa-21s) This invention relates to ne and useful improvements in rotary pumps and more particularly to pump supporting and sealing structure.

An object of the invention is to provide a pump structure which may be readily assembled with accuracy in commercial quantity production.

Another object is to provide eificient means for sealing a pump casing around the drive shaft.

Another object is to eliminate strain or warpage of the pump casing upon clamping of the same to its supporting structure.

Other and further objects will be apparent from the following description.

The invention consists in the improved construction of parts and their cooperative relation to be more fully described hereinafter, and the novelty of which will be particularly pointed out V showinternal construction, and

Fig. 3 is a detail view in section on the line 3-3 of Fig. 2.

Fig. 4 is a detail of the frictional clamping means.

Referring to the drawing by'characters of-reference, l designates generally a body or housing member having a chamber 2 formed by a cuplike cover member 3 having a surrounding flange t which seats in and against the base of an annular recess in a flat chamber wall 5. Extendingv from the wall 5 and away from the chamber 2, there is a hollow extension .8 having a bore 1 extending longitudinally therethrough. The bore 1 hasacylindrical portion 1" opening into the chamber 2 through substantially the middle pointcf the wall 5 and has, intermediate its ends, an enlarged diameter portion 8 and a bearing or guide portion .9 of reduced diameter relative to the diameter of the bore portion 1*. Within the chamber 2 there i -a. pump casing It having end closure plate members i I, l 2 between which there is clamped a hollow annular stator member IS. The end closure member l2 has an external flat face it which seats against the flat wall 8. Projecting'from the face it there is. a hollow extension it which extends through the bore I and fits the guide portion 8.v The' extension' li, ex

cept for its flt in the portion 8, is in oircumferentially spaced relation to the wall of the bore 1 so as to provide for liquid flow in the bore I around the extension l5. The passageways l6 are provided in the wall of the hollow extension 6 to permit communication between opposite sides of the portion 9. Joumaled in the pump casing extension i5 and projecting therefrom, there is a pump drive shaft il which extends out of the housing extension 8. Surrounding the shaft H and screw-threaded, as at It, into the outer end of the bore 1. there is a closure member is which tightly clamps the marginal edge portion of a sealing member" against an outward facing shoulder 2| in the extension 6. The member 20 is preferably of flexibly resilient sheet material, such, for example, as Ameripol having inserted fabric. On the shaft ii there is a two-part thrust member 22 which has a rotary fit on the shaft I1 and between the parts of which there is tightly clamped the inner peripheral portion of the annular sealing member 20. The thrust member 22 is urged toward the extension l5 by a coil spring 28 which abuts against the closure member ID and urges the thrust member l5 to take the thrust of spring 23.

The drive shaft l7 extends through the casing ID in eccentric relation to the internally cylindrical surface of the stator member l3 and is journaled in the end'closure member ll. Keyed on the shaft l1 and fitting between the closure members III ii, there is a rotor 28 of annular form and concentric with shaft ii. The rotor 29 has tangential engagement with the cylindricalsurface of stator it as at 30, see Fig. 1.

Accurate tangential sliding fit is provided by cut or formed to provide a diametrical flat portion which, being-transverse to the above mentioned extended line, will permit slight radial movement of the stator toward and irom the rotor. Any such radialmovement is. however. prevented after tight tangential contact is obtained and this is accomplished bymeans of the pin 32 which has a tight fit in alined apertures in the closure members H and i2 and also has a tight flt in the bore of a bushing 33, which bore is alined with the closure member apertures. .The

bushing bore is drilled or formed after the rotor and. stator are in tight tangential contact so that shaft l1 and in the opposite faces of the rotor. In

- the grooves 35 there are ring members'38 which support the inner ends of the vane members 31 and hold them in contact withthe eccentric in-.

ternally cylindrical face of the stator l3.

Opening from chamber 2 into the end closure 7 member 8! substantially parallel to the plane'of the rotor 29, there is an inlet conduit 39 which terminates adjacent-the point of tangential contact 30 and in registry with across passage 40 in the stator I3 and the abutting port on of mem-. ber IL, This cross passage flilopens into the. pump inlet port which is in the form of arcuate recesses 4| in the inner faces of the end members ii, I2, respectively, and which are in registry with the crescent-shaped space between the rotor and the stator. n the opposite side of the point 30 from inlets M, there isan exhaust or outlet port which comprises arcuate recesses 65 in the members H and I2. 3 From the exhaust recess 36 in plate member [2, see Fig.3, there isan exhaust outlet port 52 which opens through the closure member face M into registry with an outlet passageway 53 opening through .the fiat chamber wall 5 of the housing ,member I, The exhaust so that the vane members 31 are urged by pump pressure against the stator wall.

' asrmeo strainer member II being or an external diameter to provide a clearance space around its external circumference within the cover member 55. This strainer member may be composed of an inner cylinder of foraminous material 59, such as wire screening, which serves as a'base or support for a cylindrical pad of filter material 50. The cover member 3 is tightly clamped and sealed in position against the wall 5 by means of clamping screws 6| which engage the cover member flange 4. The fuel inlet to the housing member i aroimd the strainer member 58 is through a port 53 which opens through the wall 5 from an inlet passage- 7 way in the housing member I and connected to a pipe 64 leading from the source of fuel supply. 7

The pump outlet 53 may connect to a. pressure regulatingvalve 66 having a by-pass return conduit 18 leading into the housing member 6 for connection therein either to a return pipe 8'2 leading back to the source of fuel supply or to a port 85 discharging into the cover member 2 around 7 the strainer member 58.- J

This application is a division of my copending application Serial No. 466,116, filed November 19, 1942, for Pump and pressure control means.

Having thus described my invention, what is claimed :and is desired to be secured by Letters Patent of the United States is:

1; ,A device of the character described, comprising a housing member having a chamber and a bore opening thereinto through a flat chamber well, said bore having a reduced diameter guide portion spacedfrom said chamber, a pump casing in said chamber and having a flat face and a hollow extension projecting from said face and fitting said guide portion, pump means in said pump casing a pump drive shaft extending through said extension and operatively connected to said pump means, and means frictionally clamping said casing to said wall with said face seating tightly againstsaid well, said frictional clampingand'said spacedguide portion cooperatto eliminate substantially any flexing of said port or passage 52 is in communication. through a conduit 54 with one of the annular grooves 36 ,"The pump casing in is secured rigidly in position and with the face 14 in tight sealing engagement with the flat chamber walls so that the pump casing seals communication between the bore I and the chamber 2. This is accomplished,

' see Fig. '4, by frctionally clamping the casing II) to the wall 5 by means of screws 56, the screws being of smaller diameter than the holes 51 through the casing I0 through which thescrews casing- 2. a device ing a housing member having a chamber and a bore opening thereintothrough a flat chamber wall, said bore having a reduced diameter guide portion spaced from said chamber, a pump casing in said chamber and having a fiat face and a hollow extension projecting from said face and fitting said guide portion, pump means in said pump casing a, pump drive shaft extending through said extension and operatively connected to said pump means, means frictionally clamping said casing to said wall with said face seating 1 tightly against said wall, said frictional clamping 56 pass, so that the extension iii can be accurately 1 Within the chamber 2, there is a strainer-mam 1 bar 58 of cylindrical form whichflts over the:

closure plate member l2, which is of somewhat larger diameter'than the external dameter of.

the stator l3 and closure member Ii, so as to provide spacing between the pump casing and the "internal diameter of the strainer member 58.

The housing cover member 3 engages one end face I or the strainer members: and holds it tightly clamped against the flat chamber wall 5, the

. alined with the guide portion 9, thereby eliminating any flexing or setting up of twisting stresses in the casing 10.

and said spaced guide portion cooperating to eliminate substantially any flexing of said casing. and

. means sealing said shaft to saidhousing member closely adjacent said guide portion so that saidguide portion willhold said shaft laterally in cooperative relation to said sealing means upon clamping of said casing face to said chamber wall.'.

3. A device of the character described, comprising a housing member having a chamber and a bore opening thereinto through a flat chamber wall, said bore a reduced diameter guide portion spaced from said chamber, a pump casing in'said chamberand having a flat face and a hollow extension projecting from said face and fitting said guide portion, pump means in said pump casing,'a pump drive shaft extending extension, and operatively connected of the character described, compris- I toaaidpumpmcanameansrrictionallyclamping saidcasingtosaidwallwithsaidiaceseating ishtlyagainstsaid wall, said irictional clambiml, and said spaced guide portion cooperating to eliminate substantially any flexing of said casina'. a collar on'said shaft and abutting said extension on the opposite sideoi' said guide portion from said chamber, and annular flexible sealing means sealedtosaidhouaingandrotatabiy nttinz said shaft, said sealing means longitudinally abut. ting said collar, and spring means using said sealin: means against said collar.

4. a device of the character described, comprissaid" housing member having cooperabie outlet passageways opening through said flat casing race and said flat wall.

5. A device of the character described, compris- -ingahousingmemberhavingachamberanda bore opening into said chamber through a flat chamber wall, said bore having a reduced diameter guide portion spaced from said chamber, a pump casing in said chamber and having end plates, one of said plates having a flat {ace and a hollow extension projection from said face and ntuni said guide portion, a drive shaft extending into said pump casing thrown said extension,

means Irictionaliy clamping said casing race tightly against saidjwall, pumping means on said shaft and within said pump casing, a strainer within said housing member and surrounding said pump casing, said pump'casing, having an'inlet from said chamber, said housing member having saidchamber, said housing member having an inlet to said chamber. and said pump casing and an inlet to said chamber external 01 said strainer, and said pump casing and said housing member having cooperable outlet passageways opening through said flat casing face and said flat wall.v

snot-r voir wane.

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