US2392029A

US2392029A - Pump

Info

Publication number: US2392029A
Application number: US506470A
Authority: US
Inventors: Claud F Davis
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-10-16
Filing date: 1943-10-16
Publication date: 1946-01-01
Anticipated expiration: 1963-01-01

Description

Jan. 1, 1946. c. F. DAVIS 2,392,029

PUMP

Filed on. 16, 1943 3 Sheets-Sheet 1 25 ZmzremZmr C4. up E 0/? W6.

Jan. I, 1946. c. F. DAVIS 2,392,029

PUMP

Filed Oct. 16, 1943 3 Sheets-Sheet 2 I I8 17 m /6 I x 1 29 v T Y HYEZ 22:71

Patented Jan. 1, 1946 UNITED STATES PATENT orrlcs PUMP Claud F. Davis, Johnson City, Tenn. Application October 16, 1943, Serial No. 506,470

'7 Claims.

My invention relates to rotary hydraulic pumps of the type comprising concentric stationary androtor elements defining a plurality of segmental cylinder spaces or working chambers separated by blades shiftable radially in the stationary element.

An important object of the invention is to construct a pump of this type for eight cycle operation per revolution with a minimum amount of fluid impulse action and with continuous uniform discharge.

A further object is to produce a pump structure in which the stationary and rotor elements define a plurality of outer and inner segmental.cylinder spaces or working chambers with only one set of blades serving both th outer and the inner chambers.

A further object is to provide improved inlet and outlet porting arrangement for the outer and inner cylinder chambers and with the rotor element functioning as a valve for cooperating with the blades to control the ports for the inlet and outlet flow to and from the cylinder chambers.

Another object is to use blades in the form of cylinders or rollers, and to provide a structure in which the stationary and rotor elements are symmetrical around a common axis in order to produce perfect balance and eliminate vibration and reduce wear to a minimum.

The above enumerated and other features of my invention are embodied in th structures shown on the drawings, in which Figure 1 is a plan view of the pump structure with the rotor housing removed;

Figure 2 is a section on plane II-II of Figure 1 with the rotor housing in place;

Figure 3 is an underside view of the rotary element;

Figure 4 is a plan view of the stationary element:

Figure 5 is a section on plane V-V of Figure 2 with the housing removed and showing the rotary element in on position; and

Figure 6 is a view similar to Figure 5 showing the rotary member rotated 90 from its position on Figure 5.

The pump structure shown is adapted to be mounted with its axis vertical, and it comprises the stationary element or base I 0 having the upstanding circular flange II and the circular .wall I! rising therefrom concentric with the flange II. The top side of the stationary .element l0 provides the seating and bearing surface l3 for the rotary element H. The body I! of the rotary element is cylindrical and seats with its bottom against the surface i3 of the stationary element concentric with the flange I I.

The body l5 of the rotary element has therein th elliptical channel It which receives the circular wall I 2 and is coaxial therewith. The channel divides the rotor body l5 into outer and inner heads l1 and I8, respectively, the outer head defining the outer elliptical surface a: of th channel l6 and the inner head defining the inner elliptical surface 1 of the channel, the surfaces being parallel so that th channel is of uniform width throughout. The major axis of the inner head l8 fits the inner diameter of the circular wall I 2 while the minor axis of the outer nead l'l fits the outer diameter of the circular wall so that th inner head at the ends of its major axis engages at all times the inner side of the circular wallwhile the outer head at the ends of its minor axis engages at all times against the outer side of the circular wall.

The circular wall l2 has a pair of diametrically opposite radial slots l9 and 20 therethrough for the blades 2| and 22. These blades are prefer-. ably in the form of cylinders or rollers whose diameter is equal to th width of the slots and the width of the channel It, the blades being of a length to extend the full depth of the channel between the surface l3 on the stationary element In and the top of the channel. During operation of the structure, the circular wall I! and the blades divide the channel It into four outer segmental cylinder spaces a, b, c and d, Figure 5, and four inner segmental cylinder spaces e, f, g and h, Figure 6. The cylinder spaces are of extent and, with inlet and outlet porting arrangement to be described hereinafter, the eight cylinder spaces will sequentially have oil drawn thereto and discharged therefrom with the entire flow through the pump distributed through the eight cylinder spaces or working chambers to produce eight cycle operation.

Describing now the porting arrangement, inlet and outlet ports 1' and o are located respectively adjacent to the outer ends of the opposite sides of the slots '9 and 20, these ports serving the outer cylinder spaces a, b, c and d. Inlet ports 1' and 0' adjacent to the inner ends of the opposite sides of the

slots

19 and 20 serve the inner cylinder spaces 6, f, g and h. The location of these ports is clearly shown On Figure 4, the ports being in the stationary element I0 and terminating at their upper ends in the bearing face II of the stationary member which is engaged by the rotor member I. As indicated by the dotted lines on Figure 4, and full lines on Figure 2, the inlet ports adjacent to the slots I3 and 20 are in communication with passageways 23 and 23' which extend from aninlet chamber 24 in the stationary element Ill. an inlet passageway 23 through the stationary element connecting the chamber with a source of fluid such as oil. The outlet ports and 0' at the slots [3 and 20 are connected by passageways 26 and 26' with a discharge chamber 21 in the stationary element I0, this chamber being shown in Figure 2 as being above the inlet chamber 24, these chambers being concentric with the stationary element.

The stationary element ID has in its upper side the cylindrical bearing recess 28 for receiving the bearing boss 29 on the rotor element i4. A passageway 30 extends from the discharge chamber 21 to the bottom of the bearing recess 23 for communication with the discharge bore 3| through the body I! of the rotor element and ,the shaft 32 extending therefrom. This shaft may be connected with a suitable driving motor for the rotor element l4.

' When the rotor element I4 is rotated, the blade cylinders 2| and 22 will be engaged by the outer and inner elliptical walls a: and 1/ of the channel II to be moved back and forth in the slots i9 the space 40.

and 20 in the circular wall I 2 of the stationary element, the blade cylinders at their lower ends moving back and forth between the inlet and outlet ports 1, i and o, 0', respectively. As shown on Figure 5, when the major axis of the elliptical channel i6 is in alignment with the slots l3 and 20, the blade cylinders will be at the outer ends of the slots to be interposed between the respective outer inlet and outlet ports 1' and 0, while the inner inlet and outlet ports 1" and 0' will be covered by the inner elliptical head i8. As shown on Figure 6, when the minor axis of the elliptical channel I6 is in alignment with the slots l9 and 20, the blade cylinders will be at the inner ends of the slots to be interposed between the inner inlet and outlet ports 1''. 0', while the outer inlet and

outlet ports

1 and 0 will be covered by the outer head ll of the rotor element. Thus, the outer and inner heads I! and I3 of the rotor element will function as valves to cooperate with the blade cylinders to prevent direct connection between inlet and outlet ports and to control the ports for the proper sequential flow of fluid into the various cylinder space or working chambers and the outflow or discharge therefrom. With the arrangement shown, as the rotor element rotates, the fluid will be drawn in through the inlet 25 to the inlet chamber, 24 and from there through the exposed inlet ports into the corresponding working chambers for discharge from these chambers through the exposed outlet ports to the outlet or discharge chamber 21 and from there upwardly through the bore 3| of the shaft 32.

The rotor element is enclosed by a cylindrical cup shape housing 33 having the shoulder 34 for seating against the flange Ii, and having the flange 35 threading on to the stationary element III. A bearing member 36 in the recess 28 receives the boss 32. A neck 31 extends up from the housing 33 to receive the shaft 32, and this neck has the inner flange 38 between which and the rotor body a bearing member 33 is interposed.

When the housing 33 is applied, the rotor element will be held to the surface l3 of the stationary element iii. -A look screw 53 is provided for the housing.

When the pump is operating under heavy pressure, oil may escape out between the rotor and the surface i3, and clearance space 40 is therefore provided between the rotor and the housing 33 and flange Ii into which the escaping oil may flow to exert pressure down against the rotor to counteract and balance any upward pressure and thus keep the rotor seated.

A gland nut 4| threads into the outer end of the housing neck 31 for compressing packing 42 around the shaft 32 to seal against leakage from On Figure 2 a passage 43 is shown extending laterally from the outlet passages 26' through the stationary element to the exterior thereof, a plug 44 closing the passage end. It may be desirable to discharge the oil from the side of the stationary element instead of upwardly through the shaft 32. In such case, the plug 44 would be withdrawn, and the outer end of the shaft would be plugged or a solid shaft would be used.

All the parts of the pump structure being coaxial and symmetrical, vibration is eliminated and perfectly balanced operation results. The blade cylinders have only line contact with the sides of their guide slots and with the elliptical surfaces of the channel i6, and are furthermore bathed at all times in oil, so that the movement of the blades is practically without friction. The bearing surface between the rotor and stationary element is also kept supplied with oil so that the friction of operation of the structure and consequential wear is reduced to a minimum. The structure comprises a minimum number of parts which are of simple shapes and can be economically manufactured and assembled.

I have disclosed a practical and efllcient embodiment of my invention but I do not desire to be limited except by the appended claims to the exact construction, arrangement or operation shown and described as changes and modifications may be made without departing from the scope of the invention.

I claim as follows:

l. A pump comprising a rotor element having an outer annular member presenting an elliptical terminating adjacent to said slots in the paths of portions of said rotor members whereby said rotor members will function as valves to control the connections of said inlet and outlet passageways with said working chambers, said blade elements functioning to prevent direct connection between said inlet and outlet passageways.

2. A pump comprising two relatively rotatable elements, one of said elements having an elliptical channel therein of uniform width throughout, the other element having a circular wall thereon engaging in said channel to divide said channel into inner and outer workingchambers, said wall having radial slots therethrough, inlet and outlet ports for said working chambers located in said other element adjacent to said slots. and blade members in the form of cylindrical rollers movable radially in said slots by the engageelements having a circular wall engaging in said channel to divide said channel into inner and outer cylinder spaces, said wall having diametrally opposite radial slots therethrough, inlet and outlet ports in said second element for said outer cylinder spaces disposed at the opposite sides of said slots adjacent the outer ends thereof and inlet and outlet ports in said second element for said inner cylinder spaces disposed at opposite sides of said slots at the inner ends thereof, blade members in said slots extending across said chan' nel to be radially shifted in said slots upon relative rotation of said elements to be interposed between the inner and outer inlet and outlet ports respectively, said inlet and outlet ports being in the paths of portions of said first element to be sequentially opened and closed thereby, whereby said first element will function as a valve to control the sequential connection of said ports with said cylinder spaces.

4. A pump comprising a stationary element having a bearing surface, a rotor element seating on said bearing surface for rotation thereon, said rotor element having an elliptical channel therein of equal width throughout withits axis coincident with the rotation axis, said stationary element having a circular wall projecting therefrom into said channel concentric with the rotation axis, said wall having two diametrally opposed radial slots therethrough, blades in said slots extending across said channel to be shifted radially in said slots by the elliptical surfaces of said channel when said rotor element is rotated, said wall and said blades during rotation of the rotor element dividing said channel into inner and outer cylinder chambers, inlet and outlet passageways in said stationary element, inlet and outlet ports extending from said passageways and terminating in said bearing surface inside of said wall adjacent to the inner ends of said slots for connection with the inner cylinder chambers,

and inlet and outlet ports extending from said passageways and terminating in said bearing surface outside of said wall adjacent to the outer ends of said slots for connection with the outer cylinder chambers, said blades functioning to prevent direct communication between inlet and outlet ports, said inlet and outlet ports being in the paths of portions of said rotor element whereby said rotor element will function as a valve to control the sequential connection of said inlet and outlet ports with the inner and outer cylinder spaces.

5. A pump comprising a stationary element having a fiat bearing surface, a rotor element seating on said bearing surface for rotation thereon, said rotor element comprising inner and outer elliptical portions spaced radially to define therebetween an elliptical channel, said stationary element having a circular wall projecting from said bearing surface intosaid channel, said wall having slots therethrough, blades in said slots extending across said channel to be shifted radially by the elliptical surfaces of said channel when said rotor element is rotated, said wall and blades dividing said channel into inner and outer hydraulic cylinder chambers, and inlet and outlet ports for said chambers all terminating in the plane of said bearing surface in the paths of said rotor element portions to be progressively overlapped by said rotor element portions, whereby said portions will function as slide valves to control the sequential connection of said ports with said cylinder chambers.

6. A pump comprising two relatively rotatable elements having bearing faces engaging in a bearing plane, one of said elements having an elliptical channel therein, the other element having a circular wall thereon engaging in said channel and dividing said channel into inner and outer working chambers, said wall having radial slots therethrough, inlet and outlet ports for said working chambers located in said other element adjacent to said slots, and cylindrical blade members movable radially in said slots and functioning to prevent direct connection between said inlet and outlet ports, said inlet and outlet ports all terminating in said bearing plane in the paths of portions of said one element whereby said one element will function as a slide valve to control the connection of said inlet and outlet ports with said working chambers during relative rotation of said elements.

7. A pump comprising relatively rotatable concentric elements having fiat bearing faces in bearing engagement with each other, one of said elements having an elliptical channel therein concentric with said element, said other. element having a circular wall projecting therefrom into said channel and having radial slots, cylindrical blades in said slots for radial movement therein during relative rotation of said elements, said circular wall and said blades dividing said channel into a plurality of inner and outer hydraulic chambers, and inlet and outlet ports in said other element communicating with said channel and all terminating in the bearing face of said other element in the paths of portions of said one element, whereby, during relative rotation of said elements, said one element will function as a slide valve for said ports to control the sequential connection thereof with said inner and outer hydraulic chambers.

CLAUD F. DAVIS.