US2629540A

US2629540A - Rotary suction pump

Info

Publication number: US2629540A
Application number: US118700A
Authority: US
Inventors: Howard G Beck
Original assignee: General Tire and Rubber Co
Current assignee: Aerojet Rocketdyne Holdings Inc
Priority date: 1949-09-29
Filing date: 1949-09-29
Publication date: 1953-02-24
Anticipated expiration: 1970-02-24

Description

Feb. 24, 1953 H. G. BECK ROTARY sUcTIoN PUMP 2 SHEETSI--SHEET l Feb. 24, 1953 Filed sept. 29, 1949 H. G. BECK ROTARY SUCTION PUMP v 2 SHEETS--SHEET 2 ATTORNEYS Patentecl Fels. 24, 1953 UNITED STATES PATENT G'FFICE ROTARY sUCrioN PQM? Howard G. Beck, `Wabash, Ind., assigner :to The General Tire and Rubber Gcmpany, Akron, Ohio, a corporation of @hic lpplicaticn September 29, 1949 Serial No. 11185700 7 Claims.

This invention relates to rotary suction pumps and has for its object to provide a pump o f a simple and economical construction capable of pumping water or air, or a mixture of water and air.

A further object of the invention is to provide a suction pump which is operable to pump liquid and which has a rotor formed to provide one or more displacement chambers and a non-circular pump chamber formed to trap a volume of liquid sufficient to provide a peripheral air displacing ring, and which will operate as a hydro-turbine air pump when low of liquid to the pump ceases.

.A further object of the invention is to provide a pump of the hydro-turbine type which has a rotor so constructed that reverse ilow of duid from the pump outlet into the rotor, or from the rotor into the pump outlet is prevented.

The invention has for a further object to provide inlet and outlet ports for the rotor displacement chambers that are disposed at a radial distance from the axis of the rotor such that the proper amount ci liquid can be trapped in the pump chamber to enable the pump to yoperate as a hydro-turbine vacuum pump.

A further object of `the invention is to provide simple and eiilcient check valves the form of rubber diaphragms controlling the inlet and outlet ports of the rotor displacement chambers.

With the above and other objects in view the invention may be said to comprise the pump as illustrated in the accompanying drawings and hereinafter described, together with such variations and modifications thereof as will be apparent to one skilled in the art to which the invention pertains.

Reference should be had to the accompanying drawings forming a part of this specification, in which:

Figure 1 is a side elevation of the pump looking toward the inlet side, a portion o the casing being broken away to show parts within the casing;

Fig. 2 is a side elevation of the pump looking toward the outlet side, a lportion of the casing being broken away to show internal parts;

Fig. 3 is a section on an enlarged scale taken on the broken line indicated at 3 3 in Fig. 2;

Fig. 4 is a side elevation partially broken awai,T and shown in section, showing the liquid air displacing ring at the periphery of the pump chamber;

Fig. 5 is a fragmentary section taken on the line indicated at 5-5 in Fig. 4;

Fig. 6 is a fragmentary section taken cn'the line indicated at GF6 in Fig. 4; .and

Fig. 7 is a fragmentary .plan view of a portion of the inner rotor side plate at the inlet side of the rotor.

The pump oi the present invention is of the hydro-turbine :type which the rotor provided with air displacement chambers open to its periphery is mounted in a casing formed to provide a pump chamber which is so constructed that it will retain a suilicient volume ofliquid to form an air displacing ring at the periphery of the chamber, the :rotor periphery being spaced at different distances from circumferentially spaced portions of the peripheral wall of the pump chamber so that air in the displacement chambers of the rotor is displaced byl liquid as the chambers pass a portionof the peripheral wall of the pump chamber that is in Acloser proximity to the rotor periphery than other portions of the wall.

As herein shown, the pump casing has a chamber l which is so shaped that the circular periphery of a rotor of the proper size will be in close proximity to the peripheral wall of the chamber at circumferentially spaced points, the space between the peripheral .wall of the chamber and the periphery of the rotor gradually increasing from said points toward van vintermediate point where maximum clearance -is provided between the peripheral wall of the casing and the periphery of the rotor so .thatair Vmay be drawn into displacement chambers of the rotor and compressed as the chamber moves across the space between the points of .close clearance. As herein shown the pump chamber is 4substantially elliptical in rform with the minor axis of the ellipse substantiallycorresponding Ito the diameter of lthe rotor so that the rotor is closely adjacent the peripheral v rall of the pump chamber at diametrically opposite points .and compressionof the air in the displacement.chambers'occurs twice during each revolution of the rotor.

The rotor herein .shown .has a hub portion 2 :and impeller vanes 3 that radiate from the hub .ing points midway between the `points or small clearance. The displacement vof air in the displacement chambers f!! by liquid puts the air under compression while thehambers are passing the :points of close clearanca'andthe withdrawal of the chambers from vthe* liquid ring reduces the pressure in the displacement chambers at intermediate points, the chambers passing alternately through high and low pressure zones. As is common practice in hydro -turbine pumps, fluid passes into the displacement chambers while the chambers are passing through the low pressure zones, and is allowed to escape from the displacement chambers while the chambers are passing through the high pressure zones.

The pump casing has a centrally disposed inlet 8 through which uid is delivered into an inlet chamber 1 formed in the rotor. At the side of the pump chamber opposite the inlet 6 the pump chamber is provided with a central outlet opening 8 which opens into an annular outlet chamber S which delivers to a discharge passage I0.

The pump of the present invention is designed to draw liquid from a suitable container such as the tub of a washing machine, and to exhaust air from the container after the liquid is discharged. The casing discharge outlet I8 should be high enough to insure that sucient liquid will be trapped in the pump casing to provide a liquid seal during periods when the pump is idle.

The pump casing which may be formed in various ways, is shown composed of separable sections, having a central section I I in the form of a ring which forms the peripheral wall of the pump chamber I, the ring Il as herein shown being of substantially elliptical form. The casing has a side Wall at the inlet side formed by plates I2 and I3, and a side wall at the opposite side formed by plates I4, I5 and I6. The plates I2 and I3, and the plates I4, I5 and I6 are secured together and to the central ring II by means of circumferentially spaced bolts I1.

The outer plate I2 of the inlet side wall has the central inlet 6 formed therein and around the central inlet 6 is provided on its inner face with an annular recess I8. The inner plate I3 has an opening I 3 that registers with the annular recess I8 and is provided with a recess 28 in its inner face around the opening I9.

The inner plate I4 of the outlet side wall of the casing has the outlet opening 8 formed therein, and around the opening 8 is provided with a recess 22 on its inner side which extends to near the periphery of the rotor and which provides a space in the pump chamber into which uid may be discharged from the rotor. The intermediate plate I5 of the outlet side wall has a central inwardly projecting boss 23 which projects into the opening 8, and the outer plate I6 has an outwardly projecting boss 24. The

bosses

23 and 24 are bored to receive a ball bearing 25 in which a rotor shaft 26 is journaled. Within the boss 23 at its inner` end a sealing ring 21 is mounted which surrounds the shaft 26 and prevents leakage from the pump chamber to the bearing 25. The bearing is retained by means of

nuts

28 and 29 on the shaft 26, and by means of a plate 3U clamped to the outer face of the boss 24 by bolts SI.

The rotor is provided at its inlet side with a side wall formed by an outer plate 32, an inner plate 33, and a rubber diaphragm 34. The opposite side wall of the rotor is formed by an inner plate 35, a rubber diaphragm 36 and an outer diaphragm retaining spider 31. The plates and diaphragm forming the opposite side walls of the rotor are secured together and to the body of the rotor by means of a circumferential row of rivets 38 which pass through the hub 2 adjacent the periphery thereof. The central portions of the

plates

33 and 35 and of the dia- 4

phragms

34 and 36 and spider 31 are clamped t6 the hub 2 between a nut 39 and a shoulder 48 on the shaft 26.

The outer side wall plate 32 of the rotor has an outwardly bulged central portion 4I which forms the outer wall of the inlet chamber 1 of the rotor, and the portion 4I has a central opening surrounded by a cylindrical flange 42. The bulged portion 4I of the rotor side plate 32 projects into the casing recess 20 and the ilange 42 projects outwardly into the annular recess I8 in the pump casing. A sealing ring 43 mounted in the recess I8 engages the exterior of the cylindrical flange 42 and provides a seal between the casing inlet and the pump chamber so that liquid entering the pump through the inlet 6 passes directly into the rotor. The plate 33 forms the inner wall of the rotor inlet chamber 1 and is provided with circumferentially spaced openings 44 through which uid can flow from the inlet chamber 1 into each of the displacement chambers 4 of the rotor.

The rubber diaphragm 34 is clamped between the plate 33 and the hub 2 of the rotor at its center, and at its periphery is clamped between the plate 33 and an annular web 45 that is formed integrally with the vanes 3 adjacent the periphery of the rotor, the outer face of the web 45 being flush with the side edges of the inner portions of the vanes 3 so that the rubber diaphragm 34 is clamped throughout its periphery between the periphery of the plate 33 and the outer face of the web 45 and to the edges of the vanes 3 between the plate 45 and the hub 2. The diaphragm 34 is a flat circular disk of elastic rubber and normally lies ilat against the inner face of the plate 33, in which position it closes the openings 44. The diaphragm has an opening 46 spaced radially outwardly from each of the openings 44 and in the portion of the diaphragm that normally lies at against the plate 33. When pressure within the displacement chambers 4 is higher than the pressure in the inlet chamber 1 of the rotor, the diaphragm is held tightly against the plate 33 and seals the openings 44. When pressure in the chamber 1 exceeds the pressure in a displacement chamber 4, the portion of the diaphragm covering the opening 44 of the chamber 4 is stretched and forced inwardly as shown in Fig. 5, so that fluid can flow from the chamber 1 through the opening 46 in the diaphragm 34 that is spaced radially outwardly with respect to the opening 44.

The plate 35 at the outlet side of the rotor is provided with openings 41 which establish ccmmunication between the displacement chambers and the outlet side of the pump chamber. The diaphragm 36 is clamped to the outer face of the plate 35 by the spider 31 which has arms 48 that radiate from the body of the spider 31 for clamp. ing engagement with the diaphragm 36 along the edge or" each vane 3. The diaphragm 36 is a flat disk of elastic rubber and the portions thereof between the arms 43 that cover the openings 41 are adapted to be stretched and forced outwardly to permit ilow of fluid through the openings 41 through the outlet side of the pump chamber when the pressure within the displacement chambers 4 exceeds the pressure in the outlet portion of the pump chamber.

The

diaphragms

34 and 36 serve as check valves which permit flow of liquid from the inlet into the displacement chambers and from the displacement chambers to the pump chamber outlet, but which prevent reverse iiow. The por.-

ae'aace tions of the diaphragme which cover the openings M and 46 yield independently under pressure and function as independently operable check valves of the flap type. By utilizing a one piece rubber diaphragm and a single apertured plate at each side of the rotor a large number of independently operable check valves are provided by means of a very simple, compact and inexpensive construction.

ln the operation ci" the pump a sealing ring of liquid is formed at the periphery of the pump chamber by the impelling action of the rotor,

and this ring of liquid seals the periphery of the rotor and serves to alternately create pressure and suction in the displacement chambers 4 of the rotor. If the pump chamber is full of water when the rotor is started into operation the impelling action of the rotor will develop a hydro static pressure due to centrifugal force which acting upon the diaphragm 35 will expel liquid from the displacement chambers of the rotor to the outlet side of the pump chamber. After Sunicient water is displaced from the rotor, fluid will begin `to iiow into displacement chambers through the rotor inlet chamber l. If liquid is being delivered to the inlet G, liquid discharged from the displacement chambers will be replaced by liquid from the inlet chamber 'l and, when the liquid is replaced by air at the inlet, water will continue to be ejected from the rotor until the interior of the displacement ring of liquid is disposed outwardly of the openings ell and 46, after which the pump acts as a hydro-turbine air pump.

Pressure within each displacement chamber holds the portion of the diaphragm 34 which covers the opening de to the chamber tightly against the plate 33 while the portion of the diaphragm 36 covering the opening Mi of the chamber is being forced outwardly to permit fluid to escape from the chamber, so that the pressure developed in the displacement chamber cannot act to back the Iiuid into the inlet. rJhe openings All and 4l are disposed at a suiiioient distance inwardly of the periphery of the rotor to trap a su'cient volume of liquid to seal the periphery of the rotor and to displace the desired Volume of air in the chambers 4 during rotation of the rotor.

By reason of the check valve action of the diaphragms, the pump is eiiective to continuously pump water as long as Water is supplied to the inlet B, and to pump a mixture of watei` and air until the interior of the liquid ring in the pump chamber is disposed radially outwardly of the

openings

44 and 41, after which the pump acts as a hydro-turbine air pump.

In order to equalize pressure in the discharge side of the pump chamber and in the outlet chamber 9, openings 49 may be provided in the plate it outwardly of the outlet opening 8.

It is to be understood that in accordance with the provisions of the patent statutes, variations and modifications of the speciiic devices herein shown and described may be made without departing from the spirit of the invention.

What I claim is:

l. A rotary suction pump comprising a pump chamber with a peripheral wall and side walls, each side wall having a central opening, one of said openings providing an inlet and the other an outlet, a rotor having a periphery that is spaced at different distances from circumferentially spaced portions of said peripheral wall, said rotor having spaced side Walls the radial outer portions of which have close clearance throughout the rotor circumference with the chamber 'side walls, said rotor having liquid impelling vanes extending across the space between said side walls to form displacement chambers opening to the rotor periphery, each rotor side wall having an opening to each of the displacement chambers, said rotor side Wall openings being spaced inwardly from the periphery of the rotor and connecting each displacement chamber with said inlet and said outlet, and elastic rubber diaphragms normally closing said rotor openings, one of said diaphragms being secured to the interior of the rotor side Wall on the inlet side and another of said diaphragms being secured to the exterior-vof the rotor side wall on the outlet side, said diaphragms being secured to said walls radially inwardly of the opening and between suc cessive openings, the portion of each diaphragm overlying each opening being stretchable and movable away from the opening by fluid pressure upon the portion thereof covering the opening.

2. A suction pump of the hydro-turbine type comprising a pump chamber with a peripheral` wall and with an inlet and an outlet centrally disposed and on opposed sides thereof, and a rotor in said casing the periphery of which is,

spaced at different distances from circumferen-I `tially spaced portions of said peripheral wall, said` rotor having liquid impelling vanes acting on liquid in the pump chamber to maintain a ring of liquid against the periphery of the chamber that provides a seal between the inlet and outlet sides of the chamber, said rotor having a wall on its inlet side comprising an elastic rubber dia phragm engaging the edges of said varies and a plate engaging the exterior of the diaphragm and clamping the diaphragm against said edges, said plate having openings normally closed by said diaphragm that register with the spaces between the vanes, the portions of the diaphragm covering each opening being stretchable by uid pressure and movable away from said opening, said rotor having a wall on its outlet side comprising a plate engaging the opposed edges of said vanes and provided with openings that register with the spaces between the vanes, and an outwardly opening check valve controlling the now through each of said openings on the outlet side.

3. A suction pump of the hydro-turbine type comprising a rotor and a rotor chamber having a peripheral wall that lies close to the rotor pe riphery at circumferentially spaced points and that is spaced therefrom intermediate said points, said chamber having an inlet and an outlet centrally disposed and on opposite sides of the rotor, said rotor having a displacement chamber opening to its periphery and having a central inlet chamber with an opening that registers with the pump chamber inlet, said rotor having an opening connecting said displacement chamber with said inlet chamber and an opening connecting said displacement chamber with the interior of the pump chamber on the outlet side, a seal interposed between the rotor and pump chamber side wall around said chamber inlet and rotor opening, and check valves controlling flow into and out of said displacement chamber, said valves permitting flow from said inlet chamber into the displacement chamber and from the displacement chamber to the outlet side of the pump chamber but preventing reverse flow.

4. A suction pump of the hydro-turbine type comprising a rotor and a rotor chamber having a, peripheral wall that lies close to the rotor pe riphery at circumferentially spaced points and that is spaced therefrom intermediate said points,`A

said chamber having an inlet and an outlet centrally disposed and on opposite sides of the rotor, said rotor having a displacement chamber opening to its periphery and having a central inlet chamber with an opening that registers with the pump chamber inlet, said rotor having an inlet opening connecting said displacement chamber with said inlet chamber and an outlet opening connecting said displacement chamber with the interior of the pump chamber on the outlet side, a seal interposed between the rotor and pump chamber side wall around said chamber inlet and rotor inlet opening, an elastic rubber diaphragm normally covering the opening connecting the displacement chamber to said inlet chamber and yieldable under pressure acting toward the interior of the displacement chamber to uncover the opening, and an elastic rubber diaphragm normally covering the opening connecting the displacement chamber to the outlet side of the rotor and yieldable toward the chamber outlet to uncover the opening.

5. A rotor comprising a body portion consisting of a hub and radiating vanes, side plates secured to opposite sides of the body, each plate having an opening to each space between Vanes, an elastic rubber diaphragm clamped between one of the plates and the hub and vanes or" the rotor body and having stretchable portions between vanes covering the plate openings, a second diaphragm clamped to the exterior of the other plate radially inwardly of the openings and between successive openings and having yieldable portions covering the plate openings.

6. A rotary suction pump comprising a pump chamber with a peripheral wall and side walls, each side wall having a central opening, one of said openings providing an inlet and the other an outlet, a rotor having a periphery that is spaced at different distances from circumferentially spaced portions of said peripheral wall, said rotor having spaced side walls the radial outer portions of which have close clearance throughout the rotor circumference with the chamber side walls, said rotor having liquid impelling vanes extending across the space between said side walls to form displacement chambers opening to the rotor periphery, each rotor side wall having an opening to each of the displacement chambers, said rotor side wall openings being spaced inwardly from the periphery of the rotor and connecting each displacement chamber with said inlet and said outlet, and a check valve controlling flow of iiuid through each of said rotor side wall openings, each check valve being operable independently of the others, the valves on the inlet side of the rotor permitting flow into said displacement chambers and preventing reverse ow and the valves on the Outlet side of the rotor permitting flow out of said displacement chamber but preventing reverse ilow.

7. A suction pump of the hydro-turbine type comprising a rotor and a rotor chamber having a peripheral wall that lies close to the rotor periphery at circumferentially spaced points and that is spaced therefrom intermediate said points, said chamber having side walls that have close clearance with opposite sides of the rotor periphery, said chamber having an inlet and an outlet on opposite sides of the rotor and inwardly of its periphery, said rotor having a series of displacement chambers opening to its periphery, each displacement chamber having two openings inwardly of its periphery, one communicating with the pump chamber inlet and the other with the pump chamber outlet, and an independently operable check valve controlling each of said openings, the valves controlling the openings to the pump chamber inlet permitting flow of fluid into said displacement chambers and preventing reverse ow and the valves controlling the openings to the pump chamber outlet permitting ilow out of said displacement chambers and preventing reverse flow.

HOWARD G. BECK.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,278,700 McFarlane Sept. 10, 1918 1,662,250 Jennings Mar. 13, 1928 FOREIGN PATENTS Number Country Date 18,716 Netherlands Jan. 15, 1929