US2117573A - Rotary pump - Google Patents

Description

May 17, 1938. P. c. RAwLs 2,117,573

ROTARY PUMP Filed Jan. 8, 1936 Patented May 17, 1938 UNETD STATES PATENT OFFICE Webb-Glade Pump Iowa, a partnership Association, Fontanelle,

Application January 8, 1936, Serial No. 58,074

2 Claims.

This invention relates to improvements in rotary pumps and the like, more particularly to the type illustrated and described in the patent is sued to Frank Webb and Edwin R. Glade, on

5 July 10, 1934, No. 1,965,872.

In a device of the type employing a spherical impeller element and a cup supporting the same wherein the diameter of the impeller and cup are of diameters equal to the width of the stator space in which the rotor is mounted, the construction of the rotor member to form a unitary unit to withstand the operative strains is of vital importance inasmuch as this type of rotor is substantially divided into a number of segmental sections with a comparatively small amount of material connecting said sections. For this reason it is desirable that means be provided for reencrcing the rotor so as to form a rigid unitary unit. One of the objects of my invention is to provide in a rotary pump of the type above described improved rotor construction wherein the segmental portions may be more rigidly united together and so constructed that the cost of manufacturing will be materially reduced.

A further object oi my invention is to provide in connection with rotary pumps of the type above described, improved bearing construction for supporting the rotary element within the stator and to locate the bearing in such position as tc effectively take the lateral strain created by applying pressure to the fluid `passing through the pump, as it will readily be seen that this pressure is always in one direction and that excessive wear between the rotor shaft and the stator bearings will permit the rotor to move to position against the contacting side of the stator, which will result in excessive friction and wear.

A further object is to provide in a rotary 40 pump of the type above described, improved means for connecting and adjusting the oppositely arranged impeller cups wherein threaded sleeves connecting adjoining ends of the connecting rods may be eliminated to increase the strength of the connecting rod and at thesame time decrease the size of the area required to support the rods.

A further object is to provide in a rotary pump of the type above described, improved construction wherein the rotor shaft may be extended through the rotor and through both of the bearing members of the stator, and wherein the rotor element and the stator elements may be more quickly and easily assembled and wherein the adjustment of the impeller cups may be more easily accomplished.

My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are` attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawing, in which:

Figure 1 is a vertical central sectional view of my improved pump showing one-half of the stator case removed and the rotor in section.

Figure 2 is a detail sectional view taken on the line 2-2 of Figure 1.

Figure 3 is a detail sectional View taken on the line 3--3 of Figure l.

Figure 4 is a side elevation of my improved rotor.

Figure 5 is a detail sectional View taken on the line 5 -5 of Figure 4,

My improved pump comprises a stator casing formed in longitudinal sections it and il, said sections being secured together by means of bolts l2 extending through suitable flanges i3, the interior of the stator having its periphery formed semi-circular in cross section, the side walls of said stator chamber being parallel, each of said walls being provided with an opening M, said openings being mounted eccentrically of the periphery of the casing. The inner end of each of the openings I4 terminates in an annular recess I5.

Each of the side plates l and Il is provided with a bearing plate IB for supporting the rotor shaft l?, said plate l having outwardly extending packing glands !8 designed to receive packing material i9 and a bushing 20. The shaft openings through the plate i6 and the bushing 2! should be large enough to permit Slight lateral movement of the shaft relative to said plate and said bushing so that pressure and strain applied to the shaft may be carried by anti-friction bearings Zia supported Within the openings if! in the manner hereinafter more clearly set forth.

The rotor El is formed of two sections, 22 and 23, placed side by side and secured together by means of bolts 24 so as to form a unitary unit. The periphery of the unit thus formed is semicircular in cross section to fit the semi-circular periphery of the stator members It? and l i. The side members of the rotor terminate in circular flanges Z5, the central portion of said anges being provided with hub portions 2t, said hub members being mounted on the shaft il and xed thereto by means of suitable keys 2l. The

anges 25 are designed to enter the recesses l5 of the stator' in the manner as clearly illustrated in Figure 2. The hubs 26 extend through the openings I4, said hubs being of smaller diameter than said openings to provide space for receiving the anti-friction bearings 2|a, said antifriction bearings providing means whereby the rotor 2| and the shaft are rotatably mounted in the stator with the flanges 25 in the recesses I5.

The body of the rotor 2| is preferably provided with four radial openings 28 having their inner ends connecting with the central opening or chamber 29, preferably of a larger diameter than the shaft openings 36 in the hub members 26, the outer ends of the openings 28 being somewhat larger to provide impeller cup supporting chambers 3|, the diameter of the chambers 3| being equal to the distance between the side members of the stator chamber. The chambers 3| are provided with impeller cups 32 and 33, each of said cups having its outer end concaved to receive a spherical impeller 35. The cups 32 are supported in diametrically opposite chambers 3|, while the cups 33 are supported in another set of diametrieally opposite chambers 3| in a plane at right angles to that occupied by the cups 32. The cups 32 are supported in fixed relation to each other by means of tie rods 35, said rods having their ends screw threaded in opposite directions and into said cups. Lock nuts 36 are provided for locking the rods against rotation after proper adjustment of the cups 32 toward and from each other has been accomplished. Said rods 35 extend through the openings 23 and straddling the shaft l'l, as illustrated in Figure l, the sides of said shaft l'l adjacent to said rods being provided with notches 36 to form guides for the rods 35 to permit the said rods to move longitudinally of themselves and to prevent rotation of the cups 32 in the chambers 3|. The cups 33 are connected by a similar set of tie rods 3l, having lock nuts 38, the rods 31 passing through openings 33 formed diametrically through the shaft The rotor 2i is of smaller diameter than the stator and mounted eccentrically thereof in the manner illustrated in Figure l, the recess |5 being Y concentric with the center of the rotor and with the center of the shaft ll.

The periphery of the stator in actual construction is not a perfect circle, and is so shaped that the spherical impellers 34 of either set of impellers will always engage the periphery of the impeller during an entire revolution of any pair of said impellers.

The stator casing is provided with an inlet passage 40 and an outlet passage 4|, as clearly illustrated in Figure 1. The inner ends of these passages are provided with a pair of bridges "a2 for supporting the impellers as they move past said passages, and to permit fluid to move into the stator chamber through the passage 46 and from the stator chamber through the passage Gl. By providing the bridges 42 the inlet and outlet passages may be easily formed large enough to permit free movement of the fluid into and out of the stator chamber without offering resistance to movement of the impellers as the rotor is rotated.

In the actual construction of the device the f diameters of the anges 25 are equal to the distance between the centers of the semi-circular portions of the periphery of the rotor 2|. This flange 25 provides means for connecting the segmental sections 43 of the rotor body supported between the radial openings '28 and thus provides means for supporting the sections in a unitary unit.

Due to the fact that the chambers 3| are of a diameter equal to the width of the stator chamber it will readily be seen that said sections 43 will be separated by the forming of said openings 28 and 3|, while the hubs of the flanges 25 serve to support the bearing members 2|a. and to thereby provide a rm bearing support for the rotor.

The device is best assembled by first separating the stator sections and then placing one-half of the rotor section in position in one-half of the stator section with the shaft opening supported vertically. The tie rods 3l and 39 may then be assembled with their respective cups 32 and 33, and with respect to the shaft one end of the shaft may then be placed in position in the stator and rotor sections with the cups resting in the semi-cylindrical chambers 3| of the assembled rotor section. The cups 32 and 33 may then be adjusted so that the impellers fit the inner periphery of the stator. The other sections of the rotor and stator may then be placed in position and secured together. By this arrangement the impellers may be easily and accurately adjusted.

One advantage of my device lies in the fact that the tie rods 3l and 39 may be formed without the use of adjusting sleeves such as is disclosed in Webb and other rotary pumps of this type, thus providing more rigid connection between the opposite cups, and at the saine time providing less space for said rods. By mounting one set of the tie rods to pass through the shaft and the other set in the notches 36, I have provided means whereby the cups 32 are held against rotation within their operating chambers and at the same time permit the cups to move freely longitudinally of said tie rods and radially of the rotor. It will further be seen that the rotor may be easily machined due to the fact that the rotor may be supported on an arbor of the same diameter as the shaft Il, both halves of the said rotor being bolted together so that the periphery of the rotor and the side members of the flanges 25 may fit the interior of the stator and the recesses I5.

I claim as my invention:

1. In a rotary pump, a stator formed of longitudinal sections having a circular chamber, the periphery of said chamber being semi-circular in cross section, the side walls of said stator having openings eccentrically of the axial center of said chamber, the inner ends of said openings terminating in circular recesses; bearing plates covering the ends of said openings; a rotor formed of longitudinal sections; means for securing said sections together to form a unitary unit, the periphery of said rotor being formed with areas semi-circular in cross section, the sides of said rotor having circular anges of a diameter equal to the distance between the centers of said semicircular areas, said flanges being mounted to rotate in said recesses, said rotor having axial openings and radial openings circular in cross section between its periphery and said axial openings, the diameter of the outer ends of said radial openings being equal to the diameter of said semicircular areas; a spherical impeller element slidably mounted in the outer end of each radial opening; and a shaft supporting said rotor.

2. In a rotary pump, a stator having a circular chamber, the periphery of said chamber being semi-circular in cross section, the side walls of said stator having openings, the inner ends of said openings terminating in circular recesses, bearing plates covering the ends of said openings,

diameter of the outer ends of said radial openings being equal to the diameter of said semi-circular areas, an impeller cup slidably mounted in the outer end of each radial opening, a spherical im peller Within each cup, and a shaft operatively 5 supporting said rotor eccentrically in said stator.

PAUL C. RAWLS.

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