US2276355A - Rotary pump - Google Patents

Description

I c; w. VAN RANsT -2,276',355

March 17, 1942.

' ROTARY PUMP Filed May 19, 1938 11v VENTOR v Car a/ids 11 lizfivzsif BY v I A T1 N5 Y5- Patented Mar. 17, 1942 UNITED STATES PATENT OFFICE ROTARY rum Cornelius W. Van Ranst, Detroit, Mich.

Application May 19, 1938, Serial No. 208,754

6 Claims.

ing mechanism for pumping fluids having suspended solid particles of abrasive substances therein.

A further object of the present invention is to provide a rotary pump adaptedfor use in pumping fluids and in which the rotor member is so constructed as to eliminate the necessity for valves, springs and rotor blades.

Another object of the present invention is to provide a rotary pump construction which is so designed that the body portion may be formed of a die casting and the pump placed in operation without machining of the casting, the variations in the pumping chamber being accommodated by the resiliency of the rotary pumping element.

Other objects of this invention will appear in the following description and appended claims, reference being had to the accompanying drawing forming a part of this specification, wherein l ke reference characters designate corresponding parts in the several views.

Fig. 1 is a fragmentary elevation showing a portion of the rotary pump of the present invention adapted for use as a water pump to supply a cooling fluid to an internal combustion engine of the outboard marine type.

Fig. 2 is a sectional view taken substantially on the line 2-2 of Fig. l in the direction of the arrows.

Fig. 3 is a fragmentary view in section taken substantially on the line 33 of Fig. 2 in the dimotion of the arrows.

Figs. 4 and 5 are sectional views of the pump elements taken substantially on the line 2-2 of Fig. 1.

Before explaining in detail the present invention it is to be understood that the invention is not limited in its application to the details of construction and arrangement of parts illustrated in the accompanying drawing, since the invention is capable of other embodiments and of being practiced or carried out in various ways. Also it is to'be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation, and

it is not intended to limit the invention claimed herein beyond the requirements of the prior art.

Referring to the drawing, l0 designates a power driven main shaft which is mounted within a the water line by means of the rotary pump of the present invention.

The rotary pump of the present invention comprises a body portion i5 preferably formed of a die casting having a pumping chamber it formed in the interior thereof. The chamber I6 is concentric with the shaft ID. A propeller shaft casting H is maintained in position adjacent a flange on the body portion l5 by means of stay bolts l8 and I9 which hold the assembled parts in their respective positions.

Since the construction of the outboard motor to which the rotary pump of the present invention is attached is not. a feature of the present invention, the construction is not described in detail except insofar as it assists in explaining the present invention. The casting ll extends below the rotary pump of the present invention and surrounds the main shaft l0. Driving gears (not shown) are connected to the end of the main shaft l0 and to the horizontal propeller shaft (not shown) to drive the horizontal propeller shaft from the vertical shaft Ill. The propeller torque thrust iscarried by the casting l1 and is transmitted through the plate ll to the boat by means of connections (not shown) between the plate IB and the boat. The numeral 29 designates an oil line leading from a reservoir (not shown) to the transfer gear mechanism (not shown) in the lower part of the casting H.

The pump mechanism of the present invention is contained within the pumping chamber l6 and comprises a disc 20 mounted eccentrically on the shaft H) for rotation thereby. Surrounding the disc 20 is a bronze bushing 2| having an extending tongue 22. Rubber or other suitable resilient material 23 is bonded to the bronze bushing 2l' and is provided with an extending portion 24 in the nature of an arm provided on its outer end with a cross part or body having its ends fixed or secured and thereby anchored to opposed wall portions of a recess 2! which is cast in the body portion ll, said arm extending into said recess and its cross part or body being'conflned therein. An inlet port 26 is provided in the body casting l8 and communicates with the chamber ll and the open space enclosed by the stamped members I. A .discharge port 21 formed in the body portion ll communicates with the chamber I! and discharges fluid through the discharge conduit 22 from which the cooling fluid passes to the parts of the internal combustion engine to be cooled.

The operation of a pump embodying the present invention will be best understood by refer ence to Figs. 2, 4 and 5, in which is shown the relative positions of the parts during various stages in one complete pumping cycle. .In all of the viewsit is assumed that the direction of rotation of the shaft Iii is in the counterclockwise direction. It is to be understood, however, that the shaft ill may operate in a clockwise direction, in which event the hereinafter described operation of the'pump will be in the opposite manner, that is, the inlet port 26 will become the discharge port and the discharge port 21 will then become the inlet port; otherwise, however, the operation of the pump will be as described herein.

Upon rotation of the shaft Iii in the counterclockwise direction the eccentric member 20 is likewise rotated in the same direction and imparts an eccentric rotary motion to the bushing 2| surrounding it. when the parts are in the position shown in Fig. 2, the pump is at the beginning of its pumping cycle. In this position the inlet port 28 is partially closed by the adjacent surface of the resilient member 23 and the discharge port 21 is partially free from contact with the surface of the resilient member 23. Fluid which is entrapped in the space between the outer surface of the resilient member 23 and the wall of the pumping chamber i8 is forced out through the discharge port 21 as the rotation continues and the parts occupy the relative positions shown in Fig. 4. As is. there shown, the resilient member 23 adjacent the high spot on the eccentric member 20 is in contact with a surface of the wall of the chamber l6 and forces the fluid ahead of such point of contact in the direction of the arrows through the discharge port 21. In moving from the positions shown in Fig. 2 to those shown in Fig. 4, it is apparent that the inlet port 25 will be entirely closed du ing the time that the high point on the member 20 passes over it to come to the position shown in Fig. 4. After the high spot on the eccentric member 20 passes the inlet port 26 and moves to the position shown in Fig. 4, the inlet port 28 is open and the continued movement of the rotor causes a slight suction to be exerted thereon. As the rotation of the rotor continues, the parts move to the positions shown in Fig. 5 where it will be noted that the point of contact between the surface of the resilient member 23 and the chamber l6 has moved in a counterclockwise direction toward the discharge port 21. This movement has caused the fluid in the chamher, as shown in Fig. 4, to be expelled through the discharge port 21. The same movement causes fluid to be drawn into the chamber through the inlet port 26. As the movement of the parts then continues the parts resume the positions shown in Fig. 2 in which the point of contact between the surface of the resilient member 22 and the wall of the chamber II is such that the inlet port is partially closed and the discharge port is partially open. The movement of the eccentric member 2| and the bushing 2| is accommodated by the distortion of the cross part or body of the extending portion 24, the intermediate portion of said cross part or body flexing back and forth in the recess 25 as said cross part or body is distorted by rotation of the eccentric member 20. The tongue 22 on the bushing 2| serves as a reinforcement for the arm of said extending portion 24, as will be readily understood.

The resilient member 22 is formed of rubber or other suitable resilient materials and may be bonded according to any conventionally known methods to the bronze shell 2! so that the body portion of the resilient member 23 forms in effect a concentric shell around the bushing 2|. The extending portion 24 is held in a position in the chamber l8 and the recess 25 between the inlet port 28 and the discharge port 21 and at all times during the pumping cycle acts as a partition, which with the moving contact between the wall of the chamber. l6 and the resilient material adjacent the high point on the member 20, divides the chamber 16 in a discharge portion and a suction portion.

It will be seen that the construction thus pro! vided will operate successfully in the pumping of fluids even though there be suspended solids therein, for the passage of such solids between the surface of the chamber l6 and the rotary pumping member will be accommodated by distortion of the surfaces of the resilient covering 23 on the rotary member. As is well known,

. various fluids, such for example as water, have a lubricating effect upon rubber so that the pump as herein disclosed will operate with a reduced amount of friction due to the lubricating effect of water on the rubber at the point of surface contact between the rubber covering 23 and the walls of the chamber I6.

I claim:

1. A rotary pump comprising a pumping chamber having an inlet port and a discharge port, a rotary pumping element mounted in said chamber and comprising a power driven eccentric member, a bushing rotatably mounted on said eccentric member and having a body portion concentric with said eccentric member and an extending lug maintained in an intermediate position between said ports, a resiliently surfaced pumping element mounted concentrically on said bushing and having a tongue surrounding said lug and anchored in the walls of said chamber, said resilient element being adapted to maintain a moving, fluid-tight resilient surface contact with the interior wall of said pumping chamber at a point adjacent the high point on said eccentric member and to open and close the said ports during each revolution of said eccentric member and to provide a flexible partition in said chamber between said inlet and outlet ports.

2. A rotary pump comprising a pumping chamber having an inlet port and a discharge port, a rotary pumping element mounted in said chamber and comprising a power driven eccentric member, a concentric bushing rotatably mounted thereon and having an extending lug maintained in an intermediate position between said ports, a pumping element mounted concentrically thereon and comprising a layer 01' resilient material secured to said bushing and having an extending portion secured to said lug and 3. A rotary pump comprising a body portion having a pumping chamber having inlet and outlet ports. a pumping member rotatable in said chamber and comprising a power driven eccentric cam, a bushing rotatably mounted thereon and having an extending lug disposed between said inlet and outlet ports, a covering of resilient material secured to said bushing and lug and having extending portions adjacent said lug anchored in said body portion to provide a positive fluid-tight seal between said lug and said chamber, said covering being of suflicient thickness to be deformed between the wall of the pumping chamber and the high joint on said eccentric cam during each revolution of said pumping member to establish and maintain a moving, substantially fluid-tight resilient surface contact with the walls of said pumping chamber at points adjacent the high spot on said eccentric cam, thereby to create a predetermined suction at said inlet port and to deliver a fluid under predetermined pressures at said discharge port.

4. A rotary pump comprising a body portion outlet ports communicating therewith, a pumping member rotatable in said chamber and comprising a power driven eccentric cam, a bushing rotatably mounted thereon and having an extending lug disposed between'said ports, a concentric layer of resilient material secured to said bushing and lug and secured in said chamber at points adjacent said lug to provide a re-' taining a pumping chamber having an inlet port and a discharge port, said casing also containing a recem extending outwardly from said containing a pumping chamber having inlet and chamber between said inlet and discharge ports, a distortable body located in said recess and having-its ends secured or fixed to opposed wall portions of said recess, the intermediate portion of said body flexing back and forth in said recess as said body is distorted, an eccentric member rotatable in said chamber and having a resiliently surfaced pumping element mounted concentrically thereon to maintain a moving fluid-tight surface contact with the interior wall of said pumping chamber at a point adjacent-the high point on said eccentricmember, said re-- siliently surfaced pumping element having a portion extending into said recess and connected to an intermediate portion of said distortable body to providea fluid-tight seal between said ports creating a predetermined negative pressure at the inlet port and a predetermined positive pressure on the fluid delivered to the discharge port during each revolution of said eccentric member.

6. A rotary pump, comprising a casing containing a pumping chamber having an inlet port and a discharge port, said casing also containing a recess extending outwardly from saidchamber between said inlet and discharge ports, an eccentric member rotatably mounted in said chamber, and a resilient member in said chamber surrounding and movable with said eccentric member and having resilient fluid-tight contact for pumping purposes with successive portions of the chamber wall during rotation of saidvecv centric member, said resilient member having a reinforced arm extending outwardly into said recess and also having a distortable body on the outer end of said arm, said body being disposed substantially normal to said arm and said arm being connected to an intermediate portion or

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