US2094143A - Pumping apparatus - Google Patents

Description

Sept. 28, 1937. c. P. CADY PUMPING APPARATUS Filed Aug. 29, 1935 INVENTOR (1107/65 1. ('a

Patented Sept. 28, 1937.

PUMPING PATENT OFFiC APPARATUS Charles P. (lady, Canastota, N. Y., assignor to The Linley Corporation, Canastota, N. Y., a corporation of New York Application August 29, 1935, Serial No. 38,371

Claims.

This invention relates to compressing apparatus, and particularly to compressing apparatus of the type which may be used as a pump for fluids or as a fluid motor or meter.

Among the objects of the invention is to provide a compressing apparatus simple in construction, requiring no adjustment after assembling, having few moving parts, and otherwise designed for economy in manufacture.

Another object of the invention is to provide a fluid force pump capable of eflicient and noiseless operation and which incurs relatively lowexpense for its construction in compa ison with pumps of the same general classification The apparatus embodying the present inve ion includes a cylinder containing a rotor having expansible chambers which are varied in size by pistons receiving oscillatory motion owing to the rotation of the rotor. The oscillation of the pistons is accomplished by a pair of rockers which are guided upon sloping surfaces as the rotor is rotated, the rockers having curved bearing edges which engage grooves in the pistons and cause complete oscillation of the pistons accompanied by a double intake and discharge impulse for each revolution of the rotor. The apparatus is characterized by the absence of contacting spherical surfaces and the use of cylindrical and planar surfaces for the rotor and pistons, thereby enabling close machining and accurate fitting of the moving parts in a manner conducive to obtaining reasonable operating efficiency for a pump calling for relatively low manufacturing costs.

Other objects of the invention involving novel construction and combinations of parts will appear in the specification and claims thereof, setting forth what is now considered to be the best mode of applying the invention, which may be fully understood from the detailed description and drawing. In the drawing:

Fig. 1 is a vertical section taken transversely of the cylinder and axis of rotation of the rotor taken on line Ii of Fig. 2.

Fig. 2 is a vertical section on the axis of rotation of the rotor taken on line 2-2 of Fig. 1.

Fig. 3 is a section on line 33 of Fig. 1.

Fig. 4 is an end view of the apparatus with the end plate removed.

Fig. 5 is a perspective view of one of the pistons.

For clarity of disclosure I shall describe the invention with reference to its use as a pump wherein the impelling parts are driven by power applied to the shaft and it will be understood. that as a meter or motor the fluid forced against the impelling or moving parts cause actuation of the shaft. The pump comprises a cylinder containing the impelling parts including a rotor and pistons. The cylinder is in the form of a casing I 0 which may be cast in one piece, if desired, and suitably cored for the chambers and bore. It is provided with a pair of chambers ll, l2, which are individually in open communication at their inner sides with the cylinder bore except as intercepted by the cylindrical surface of the rotor i3. Chambers II and I2 have connection with inlet l4 and outlet l5, respectively, whose operating functions may be reversed, depending upon the direction of rotation of the rotor and the operating cycle of the pistons.

The ends of the cylinder are closed by end members or cylinder plates l6, l1, which are similar and are held in place by screws Ill. I Gaskets l9 and are provided between finished surfaces of the end plates and cylinder casing. The cylinder plates are provided with bearings 2|, 22, for the 20 rotor shaft 23 to which may be aillxed a pulley, gearing or other mechanism for transmitting rotary motion to or from the shaft. The bearings are keyed to the stationary end plates by some such means as set screws 24 so as to prevent their 25 rotation relative to the cylinder, for reasons which will appear hereinafter.

Rotor i3 is made up of a pair of members 25, '26, (Figs. 1 and 4), which provides. cylindrical bore 21 (Fig. 2) in which the pistons are disposed. .30 The axis of the cylindrical bore2l within the rotor is .at right angles to the axis of rotation of the rotor so that pistons 28- and 29 are pivotaliy mounted to oscillate at right angles to the axis of shaft 23 which carries the rotor. Fig..1'is a sectional elevation of the pump taken through the axis of oscillation of the pistons and shows the working surfaces 30 and 3| of one of the pistons. The purpose of making the rotor in two parts is to provide a simple construction'whereby the'40 interior of the rotor may be easily drilled and finished to provide a cylindrical bore for accommodating the pistons 28 and 29, but the rotor may be made up from two or more parts of different configuration, if desired. As illustrated in Fig. 4, member 26 is in the form of a segment having a flat surface constituting one of the two parallel walls of the piston chamber within the rotor. The two members 25 and 26 may be secured together by dowel pins 32 or in any other manner, as by 50 brazing or welding.

Each piston 28 and 29 is provided with a slot 33 which is so proportioned as to allow clearance for shaft 23 as the pistons are rocked. The outer contacting surfaces of the pistons are cylin therupper chamber between the working surfaces 30 of the two pistons is in a contracted condition, whereas the lower chamber between worinlng surfaces 3! is in an expanded condition. ffne change from minimum contracted condition to maximum expanded condition, and vice versa, occurs through of rotation of the rotor, as will be explained hereinafter.

The oscillation of the pistons takes place about the enlargedbearing surface of pin 35 which is itself mounted in a hole 31 drilled in the rotor [3 (Fig. 1). The shoulder effect producedbythe enlarged portion of the bearing pin assures that there will be no longitudinal displacement of the 7 bearing pin relative to the rotor.- Pin 38 acts as a spline between shaft 23 and bearing pin 35, so that rotation of shaft 23 in its bearings will carry with it the bearing pin and rotor 13, and it is a feature of this construction that the torque transmitted from shaft 23 to rotor I3 is entirely independent of the free rocking action of the pistons on their'bearing pin 35 50 that no binding of the pistons can occur. A screw 39 may belused as a plug for filling the hole drilled in the end of the bearing pin for accommodating pin 38. Preferably, the head end of this screw should-be ground to form a continuous surface with the exterior of rotor l3. Other ways of mounting the rotor for rotation of shaft 23 may be availed of, as, for example, the holes in the two members 25 and 26 which constitute the rotor would not need to extendto the peripheral surface of the rotor, thereby eliminating the necessity of using a plug similar to screw 39, They may be drilled from the sides of the piston bore sufliciently deep :for accommodating stub ends of a piston bearing pin.

The inclinations of pistons 28.and.29 within the bore of rotor l3 are controlled by a pair of rockers or bridge members 40 and all and a pair of cams or inclined bearing surfaces. The two bridge members are similar. and one controls piston 28 and "the other controls piston 29. The" bridge portion 42 isprovided with a slot 43 for the passage of shaft 23. The slot is sufliciently long to prevent interference between rockers and shaft. The outside surface of the bridge portion 42 isflat'and bears against an anti-friction pad 36, which is self-lubricating and is mounted upon an inclined bearing surface 44. This surface is preferably formed from a part of the shaftbear ingll, and it is thereby maintained stationary with respect to the cylinder. The flanges of the rockers 40 and 4| are provided with ourvededges 45, 46, (Fig. 4) whichfit into slots 41, 48 in the pistons (Fig. '5). The rockers, buttressed against and guided by the sloping surfaces, serve to oscillate the pistons upon bearing pin 35 as shaft 23 and rotor l3 are rotated. Rotation of the rotor and rockers about the axisof shaft 23 causes the rocking members to slide transverslyyto shaft .23 and'at the same time rock to transmit oscillatory motion to the pistons at right angles to the axis of shaft23. The motion transmittedby the action'of therockers and slopingsurfaces is universal in character, causing rocking of the pistons on one axis while the axisis being rotated about another-axis at right angles thereto.

As previously described, there are two working walls 30 and 3| to each piston and these are complemental to each other so that when the pistons are rocked, the upper pair of walls so of the pistons approach each. other for one half revolution of shaft 23, and retract from each other for the other half revolution of rotation of shaft 255.

as shown Fig. 2, the upper walls of the pistons are in their closest position or" approach, where as the lower waits are in their most separated position. As shaftZii is rotated in a countercloclz wisedirection, Fig. i, the upperwalls are gradually separated from each other, thereby causing them to draw in fiuid from chamber II. This fluid enters through port 49 in the rotor and into the expanding chamber or space provided by the separating action of opposite walls of the pistons.

While this is happening, the lower pair of walls 3| of the pistons are being forced towards each other and the fluid .contained therebetween is i being expelled through port 50 andinto chamber A IL The two'variable chambers or spaces between the pistons, includingas part thereof ports 49 and 50, are varied from minimum to maximum for each half rotation of shaft 23, so that two pumping operations are completed for each revolution of shaft 23. "It will be understood that the rotor, j

shaft 23 may be rotated in either direction for changing the inlet and outlet of the pump. Also,

that without changing the direction of rotation, of the rotor shaft, the inlet and outlet, of the pump, or the direction of fluidlflow to and from the pump may be changed by reversing the inclination of bearing surfaceslk. This maybe accomplished by displacing these bearing surfaces through 180 by inverting the fixed relationship of theend plates in respect to thecylinder.

a it

While the apparatus is admirably suited for use 7 as a force feed pump for liquids it will be understood that its use is not'limited to any particular fluids or gases, or either as acompressing or v exhaust apparatus, motor or meter.

What is claimed isz' i 1. In combination; a cylinder having 9. cylindrical bore and inlet and outlet ports individually communicating with the bore, a rotor mounted for rotation in'said bore, said rotor also having -a cylindrical bore, theaxis of the rotor bore being in the plane of, the axis of said first named bore and at right angles, thereto, a pair of pistons mounted for. oscillation within the bore of said rotor, said, pistons; providing variable chambers, rocker means and cams for causing universaljmotion of. said pistons resulting from oscillation of thepistonson their own axis and rotation'with the rotori about the rotor axis of rotation, and means for rotating said rotor for bringing the variablechambrs into periodic jreg-f istration with the inlet and outlet ports.

2. In combination, a cylinder having 2. Gym:

drical bore and inlet and outlet ports individually, V communicating with the bore, a rotor mounted for rotation in said bore, withitsperipheralsurface in operating contact with the cylindrical wall of said bore, said peripheral surface having portions adjacent said inlet and outlet ports during rotation of the rotor, said rotor having a cylinpiston means mounted for oscillation in the bore drical bore therein angularly disposed at'right .anglesin respect to the bore of said cylinder,

of said rotor for varying the size of chambers within thebore ofsaid rotor, each of. said chambers being provided. with a passage therefrom and through theperipheral surface of the rotor for periodically communicating its associated chamber with said inlet and outlet ports upon rotation of the rotor, and means for oscillating said pistons to take in and expel fluid from the variable chambers from and to said-inlet and outlet ports as said rotor is rotated.

3. In combination, a cylinder having a cylindrical bore and inlet and outlet ports individually communicating with the bore, a rotor mounted for rotation in bearings in said cylinder, pistons within said rotor, said pistons being disposed in a bore in said rotor which is at right angles to the axis of said first named bore, a bearing pin mounting said pistons for rocking movement in respect to said rotor, cams carried by said cylinder, and rocking means carried by said rotor and pistons for rocking said pistons by engagement with said cams as the rotor rotates, said rotor having ports in constant communication with the working surfacesof said pistons for enabling periodic communication with said inlet and outlet ports as the rotor rotates.

4. In combination, a cylinder, a rotor mounted therein, pistons mounted in said rotor for oscillation at right angles to the axis of said cylinder and rotor, said pistons providing variable chambers in said rotor by their oscillation, means for oscillating said pistons, said means including sloping surfaces and rockers cooperating therewith and with said pistons for oscillating said pistons upon rotation of said rotor and pistons in respect to the sloping surfaces, said cylinder having chambers separate from one another with which the variable chambers are periodically registered as the rotor is rotated.

5. In combination, a cylinder having a bore and inlet and outlet ports opening into said bore, a rotor mounted for rotation in said bore with its peripheral surface in operating contact with the cylindrical wall of said bore, said peripheral surface having portions adjacent said inlet and outlet ports during rotation of the rotor, said rotor also having a bore therein, the rotor bore being angularly disposed at right angles in respect to the bore oifi said cylinder, a pair of pistons mounted for oscillation within the bore 01 said rotor-for providing variable chambers, each of said chambers being provided with a passage therefrom and through the peripheral surface of the rotor for periodically communicating its associated chamber with said inlet and outlet ports upon rotation of the rotor, means for oscillating said pistons on their own axes as they are rotated with the rotor about the axis of rotation of the rotor, and means for rotating said rotor for bringing the variable chambers into periodic registration with the inlet and outlet ports.

CHARLES P. CADY.

Images