US1700818A - Rotary machine - Google Patents

Description

Feb. 5, 1929.

I. H. WILSEY RO'II'ARY MACHINE Original Filed Dec. 29, 1926 2 Sheets-Sheet 1 J4 J4 L M Feb; 5, 1929.

l. H. WILSE Y ROTARY MACHINE Original Filed Dec. 29, 1926 2 Sheets-Sheet 2 Patented Feb. 5, 1929.

UNITED STATES 1,700,818 PATENT OFFICE.

IRVEN H. WILSEY, OF CHICAGO, ILLINOIS ASSIGNOR TO JAMES B. TUTHILL, OI CHICAGO, ILLINOIS.

ROTARY MACHINE.

Application filed December 29, 1926, Serial No. 157,674. Renewed June 27, 1928.

The present invention relates to improvements in rotary machines, particularly machines of the type disclosed in my copending application, Serial No. 145,127 filed October 30, 1926.

The primary obje of my invention resides in the provision of a rotary machine, in'which liquid will pass in a single direction regardless of the direction in which the machine is operated.

Another object is to provide a new and improved gear and pinion pump, in which the pinion and the crescent-shaped partition will be automatically adjusted through 180 upon reversal of rotation of the gear, so as to cause the liquid to flow in a single direction.

A general object is to provide a new and improved pump of the above character which is highly resistant to wear, which has a high efliciency, which will automatically relieve excessive pressures, and which is relatively simple and inexpensive in construction.

Further objects and advantages will become apparent as the description proceeds.

In the accompanying drawings, Figure 1 is a longitudinal sectional view of a rotary machine embodying the features of my invention, said view being taken along line 11 of Fig. 2.

Fig. 2 is a sectional view taken along line 2-2 of Fig. 1.

Fig. 3 is a view similar to Fig. 2, but showing the segment and the pinion adjusted through 180.

Fig. 4 is an inside view of the end plate, said view being taken substantially along line 44= of Fig. 1.

Fig. 5 is an end view of the carrier for the pinion.

Fig. 6 is a side view of the carrier.

Fig. 7 is a fragmentary sectional view taken in the plane of line 7 of Fig. 3..

Fig. 8 is a fragmentary sectional view taken in the plane of line 8 of Fig. 3.

Fig. 9 is a sectional view taken substantially along'line 99 of Fig. 1.

While the invention is susceptible of various modifications and alternative constructions, I have shown in the drawings and will herein describe in detail the preferred embodiment, but it is to be understood that I do not thereby intend to limit the invention to the specific form disclosed,

but intend to cover all modifications and alternative constructions falling within the spirit and scope of the invention as expressed in the appended claims.

Referring more particularly to the drawings, the exemplary embodiment of the invention consists of a pump casing 10 which is supported by a suitable base 11. The casing 10 preferably comprises a central cylindrical body member 12, a rear end plate or head 13 formed integral with the base 11, and a front end plate or head 14. The body 12 and the outer end plate 14 are removably secured to the inner or rear end plate 13 by means of a plurality of equally spaced bolts 15. The interior of the casing 10 is cylindrical in shape, and communicates at opposite sides with fluid admission and discharge ports 16 and 17 respectively, which are adapted to be connected into any suitable fluid line (not shown). These ports preferably open upwardly so that the machine, if operating as a pump, is primed at all times.

Diametrically opposed lands 18 and 19 are mounted in the peripheral wall of the body 12, and separate the interior thereof into fluid admission and discharge chambers 20 and 21. trally in the casing 10, and on' a drive shaft 23, which extends outwardly through the support 11 and through a packing box 24 suitably provided in the support. A pulley 25 adapted to be connected to a suitable source of power (not shown) is mounted on the outer end of the shaft 23.

- The rotor 22 is substantially smaller in diameter than the interior of the casing" 10, and therefore defines with the latter an annular space which is divided by the lands 18 and 19 to provide the chambers 20 and 21, referred to in the foregoing. The rotor, in the present instance, comprises a circular plate 26 having a hub 27 which fits into a recess 28 in the inner face of the plate or head 13, and which is rigidly mounted on the inner end of the shaft 23, as by means of the screw 29. Formed on the front face of the plate 26 and at the periphery thereof are a plurality of laterally projecting circumferentially spaced internal gear teeth 30 of any suitable form, separated by spaces 31. The outer ends of these spaces, upon rotation of the shaft 23 are adapted to be moved successively across or past each of A rotor 22 is mounted centhe lands 18 and 19 from con'nnunication with one into communication with the other of the chambers 20 and 21.

The lands 18 and 19 are movable in the casing 10 and hence are separate from the casing. It is, therefore, possible to caseharden the lands, and to make them of material highly resistant to wear, thereby prolonging the life and efficiency of the pump. While the lands 18 and 19 may be of any suitable form and may be mounted in the casing 10 in any suitable manner, I prefer to provide them in the form of blocks which are slidably mounted respectively in suitable guide-ways 32 and 33 for movement toward and from the periphery of the rotor 22, and which are shaped to conform to the curvature of the rotor. Each land is held lightly and yieldingly in engagement with the periphery of the rotor by a coil spring 34, the spring being disposed in a bore or depression 35 in the outer surface of the land, and impinging against the end of the associated guide-way. A drain opening 53 normally closed by a screw plug 54 is provided for the lower guide-way 33.

A narrow notch or passage 36 is formedalong one side of each land to Vent the interior of the associated guide-way to the casing. Preferably these notches 36 are formed in 'the sides of the guide-ways 32 and 33. v

In Figs 2 and 3, the notches 36, referred to herein as vent passages, open from the spaces back of the lands 18 and 19 to the fluid pressure admission chamber 16. In Fig. 9, the notches are shown communicating with the exhaust or discharge chamber 17. It will be evident that a change from one arrangement to the other can readily be effected by reversing the body 12 between the end plates or heads 13 and 14.

By providing lands yieldingly engaging the rotor, grit, dirt and other foreign substances can pass through the machine without causing excessive wear. In machines with rigid lands, after wear occurs, leakage often results. The lands provided in the present instance may be made of material highly resistant to wear, and will follow the contour of the rotor as wear occurs. Since the lands will yield to permit the natural film thickness to exist, the machine is well adapted for different kinds of liquids having different film thicknesses. By providing movable lands, hydraulic locking between the teeth of the rotor and of the pinion in passing the lands is avoided.

The end plate or head 14 is cup-shaped to provide a hollow cylindrical chamber 37 and is formed with a tubular bearing projection 38 in axial alinement with the shaft 23. A carrier 39, which preferably is in the form of a circular disk concentric with the shaft 23, is supported on a stub shaft 40 journaled in the bearing projection 38. The carrier 39 fits closely into an annular notch 41 formed in the inner edge of the plate 14, and has an eccentric hub 42 seating against a bearing flange 43 formed at the inner end of the bearing 38. On its inner face, the carrier 39 is provided with a pin-14 which extends inwardly between the teeth 30 and eccentric-ally of the shaft An idler pinion 45 having teeth 46 mcshing with the teeth 30 of the rotor 39 is mounted on the pin 44. A crescent-shaped projection or partition 47 is formed 011 the inner or rear face of the carrier 39 and extends inwardly into the space between the idler pinion 46 and the rotor.39. The partition 47 bears against the inner ends of the teeth 30 and the outer ends of the teeth 46 through approximately 180. The outer and inner curved surfaces of the partition 47 thus conform respectively to the curvatures of the rotor 39 and the pinion 45.

The carrier 39 is loosely mountedin the end plate 14 for self-adjustment. A spring 51 disposed in an axial bore 52 in the end of the shaft 40 tends to hold the carrier 39 against the rotor. To limit this adjustment to an arc of approximately 180, the inner peripheral surface of the chamber 37 is formed .with opposed inwardly extending lugs 48 and 49. These lugs are positioned in a plane at one side of the shaft 23 so that a pin 50 on the carrier 39 will assume diametrically opposed positions when positioned selectively against said lugs.

In operation, let it be assumed that in Fig. 2 the rotor 22 is turning counter-clockwise, and that the machine is operating as a pump. Friction of the rotor 22 and the pinion 45 against the partition 47 tends to move /the carrier 39 counter-clockwise. Hence, the pin 50 will impinge against the lug 48 to position the partition 47 across the land 19. Fluid will pass from the port 16 and chamber 20 to the chamber 21 and discharge port 17. shown in Fig. 9, the vent passages 36 open into the discharge chamber 21, and hence the pressures on opposite sides of the lands will substantially balance each other. In the construction shown in Figs. 2 and 3, the Vent passages 36 open into the inlet chamber 20, so that if the pressure in the chamber 21 rises above a predetermined value, it will move the lands away from the rotor 22, thereby permitting b-y-passing and automatic pressure relief.

If rotation of the rotor 22 is now reversed, i. e. if the rotor is driven clockwise, the carrier 39 will be rotated through 180 to move the fin 50 against the lug 49 and position the partition 47 across the land 18 (see Figs. 3 and 9). As a result, liquid will continue to flow from the chamber 20 to the chamber 21. Liquid will thus be pumped in one unchanging direction regardless of which direction the pump is driven.

I claim as my invention:

1. A rotary machine having, in combination, a casing having inlet and outlet ports, a rotor in said casing, said rotor ha ing internal gear teeth, the spaces between which are adapted to communicate successively with said ports, a carrier loosely rota-table in said casing, an idler pinion mounted on said carrier and meshing with said rotor, and a partition on said carrier, saidpartition being disposed between said rotor and said pinion, and said carrier being automatically adjustable through 180 upon reversal of rotation of the rotor.

2. A rotary machine having, in combination, a casing havin inlet and outlet ports and havin a pair of diametrically opposed lands in Its peripheral wall between said ports, a rotor having internal gear teeth at its periphery in said casing, a head closing one end of said casing, a carrier loosely rotatable in said head, a gear pinion rotatably mounted on said carrier eccentrically of said rotor and meshing with said teeth, a partition on said carrier, saidpartition extending between one side of said pinion and said teeth, and serving as a cut-off, a pair of spaced lugs formed on said head, and a pin projecting from said carrier into the plane of said lugs. I

3. A rotary machine having, in combination, a casing having inlet and outlet ports and having a pair of diametrically opposed lands in its peripheral wall between said ports, a rotor having internal gear teeth at its periphery in said casing, a head closing one end of said casing, a carrier loosely journaled in said head, a gear pinion rotatably mounted on said carrier eccentrically of said rotor and meshing with said teeth, a partition on said carrier, said partition serving as a cut-off, and spaced lugs formed on said head and said carrier to limit rotary movement of said carrier.

4. A rotary machine having, in combination, a casing having inlet and outlet ports and having a pair of spaced lands in its peripheral wall between said ports, a rotor having internal gear teeth at its periphery in said casing, a head closing one end of said casing, a carrier having a stub shaft loosely rotatable in said head, spring means tending to press said carrier axially toward said rotor, a gear pinion rotatably mounted on said carrier eccentrically of said rotor and meshing with said teeth, a partition on said carrier, said partition serving as a cut-ofi', and coacting means on said head and said carrier for limiting the extent of rotry movement of said carrier.

5. A rotary machine having, in combination, a casing having inlet and outlet ports,

a pair of diametrically opposed lands in said casing and between said ports, an internal gear member rotatable in said casing and having peripheral engagement with said lands, a carrier rotatably adjustable in said casing, an idler pinion mounted eccentrically on said carrier and meshing with said gear member, a crescent partition on said carrier between said gear member and said pinion, and stopmeans for limiting the adjustment of said carrier, so that in one extreme position said partition is positioned across one land and in the other extreme position, said partition is located across the other land.

6. A rotary machine having, in combination, a casing having inlet and outlet ports, a rotor in said casing, said rotor having internal gear teeth, a pair of movable lands mounted in said casing between said inlet and outlet ports, a carrier mounted in said casing, a pinion mounted eceentrically on said carrier and meshing with said rotor, and a partition on said carrier disposed between said rotor and said pinion, said carrier being self-adjustable through approximately 180 upon reversal of rotation of said rotor.

7. A rotary machine having, in combination, a casing having inlet and outlet ports,

a rotor in said casing, said rotor having internal gear teeth, a pair of movable lands mounted in said casing between said inlet and outlet ports, the backs of said lands being exposed to the pressure in one of said ports, a carrier mounted in said casing, a pinion mounted eccentrically on said carrier and meshing with said rotor, and a partition on said carrier disposed between said rotor and said pinion, said carrier being self-adjustable through approximately 180 upon reversal of rotation of said rotor.

8. A rotary machine having, in combination, a casing having inlet and outlet passages, a rotor in said casing, said rotor having internal gear teeth, the spaces between which are adapted to communicate successively with said passage, a carrier rotatably adjustable in said casing, an idler pinion mounted on said carrier and meshing with said rotor, a partition on said carrier, said partition being disposed'betwecn said rotor and said pinion, said pinion and said partition bong adjustable with said carrier about the axis of the latter, and coacting lugs on said carrier and said casing for limiting adjustment of said carrier to a range of approximately 180.

In testimony whereof, I have hereunto allixcd my signature.

IRVEN H. WILSEY.'

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