Патент USA US2117573код для вставки
May 17, 1938. P. c. RAwLs ROTARY PUMP Filed Jan. 8, 1936 ' 2,117,573 . Patented May 17, 1938 2,117,573 UNETD STATES PATENT OFFICE 2,117,573 ROTARY PUlVIP Paul C. Rawls, Des Moines, Iowa, assignor to Webb-Glade Pump Association, Fontanelle, Iowa, a partnership Application January 8, 1936, Serial No. 58,074 2 Claims. This invention relates to improvements in ro tary 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 con struction 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 15 sections with a comparatively small amount of material connecting said sections. For this rea son it is desirable that means be provided for reenícrcing the rotor so as to form a rigid uni tary unit. One of the objects of my invention 20 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 25 in connection with rotary pumps of the type above described, improved bearing construc tion for supporting the rotary element within the stator and to locate the bearing in such posi~ 30 tion as tc effectively take the lateral strain cre ated 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 35 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 oppo sitely arranged impeller cups wherein threaded sleeves connecting adjoining ends of the con necting rods may be eliminated to >increase the strength of the connecting rod and at the‘same 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 construc tion wherein the rotor shaft may be extended through the rotor and through both of the bear ing members of the stator, and wherein the rotor element and the stator elements may be more quickly and easily assembled and wherein the (Cl. 103--138) adjustment of the impeller cups may be more easily accomplished. My invention consists in the construction, ar rangement 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 10 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. 15 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 20 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 re~ 30 cess I5. Each of the side plates l0 and Il is provided with a bearing plate IB for supporting the rotor shaft l?, said plate l5 having outwardly ex tending packing glands !8 designed to receive packing material i9 and a bushing 20. The shaft openings through the plate i6 and the bushing 2ï! should be large enough to permit Slight lat eral movement of the shaft relative to said plate and said bushing so that pressure and strain ap plied to the shaft may be carried by anti-fric tion 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 semi circular 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 ñanges be ing provided with hub portions 2t, said hub members being mounted on the shaft il and ñxed thereto by means of suitable keys 2l. The 2 10 2,117,573 ñanges 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 means for supporting the sections in a unitary unit. openings I4, said hubs being of smaller diam diameter equal to the width of the stator cham Due to the fact that the chambers 3| are of a eter than said openings to provide space for re ber it will readily be seen that said sections 43 will Cî ceiving the anti-friction bearings 2|a, said anti friction bearings providing means whereby the be separated by the forming of said openings 28 rotor 2| and the shaft |'| are rotatably mounted in the stator with the flanges 25 in the re support the bearing members 2|a. and to thereby provide a ñrm bearing support for the rotor. The device is best assembled by first separating 10 cesses 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 15 the shaft openings 36 in the hub members 26, the outer ends of the openings 28 being somewhat larger to provide impeller cup supporting cham bers 3|, the diameter of the chambers 3| being equal to the distance> between the side members The chambers 3| are pro vided 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 25 cups 33 are supported in another set of diametrie ally 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 30 their ends screw threaded in opposite directions and into said cups. Lock nuts 36 are provided for locking the rods against rotation after proper ad justment of the cups 32 toward and from each 20 of the stator chamber. other has been accomplished. Said rods 35 ex ._ tend 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 and 3|, while the hubs of the flanges 25 serve to 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 pe riphery 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 op posite 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 The cups 33 are connected supported on an arbor of the same diameter as 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 45 stator and mounted eccentrically thereof in the manner illustrated in Figure l, the recess |5 being 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. in the chambers 3|. Y concentric with the center of the rotor and with 50 the center of the shaft ll. The periphery of the stator in actual construc tion 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 55 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 60 for supporting the impellers as they move past 15 20 25 30 35 40 I claim as my invention: 1. In a rotary pump, a stator formed of longi tudinal 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 termi nating in circular recesses; bearing plates cover ing the ends of said openings; a rotor formed of longitudinal sections; means for securing said sections together to form a unitary unit, the pe riphery of said rotor being formed with areas semi-circular in cross section, the sides of said rotor having circular ñanges of a diameter equal to the distance between the centers of said semi 60 said passages, and to permit fluid to move into the circular areas, said flanges being mounted to stator chamber through the passage 46 and from rotate in said recesses, said rotor having axial the stator chamber through the passage Gl. By openings and radial openings circular in cross providing the bridges 42 the inlet and outlet section between its periphery and said axial open ings, the diameter of the outer ends of said radial 65 65 passages may be easily formed large enough to permit free movement of the fluid into and out of openings being equal to the diameter of said semi the stator chamber without offering resistance to circular areas; a spherical impeller element slid movement of the impellers as the rotor is rotated. ably mounted in the outer end of each radial In the actual construction of the device the opening; and a shaft supporting said rotor. f diameters of the ñanges 25 are equal to the dis 2. In a rotary pump, a stator having a circular 70 tance between the centers of the semi-circular chamber, the periphery of said chamber being portions of the periphery of the rotor 2|. This semi-circular in cross section, the side walls of flange 25 provides means for connecting the seg said stator having openings, the inner ends of mental sections 43 of the rotor body supported be said openings terminating in circular recesses, 75 tween the radial openings '28 and thus provides bearing plates covering the ends of said openings, 2,117,573 a rotor, the periphery of said rotor being formed with areas semi-circular in cross section, the sides of said rotor having circular flanges of a diameter equal 'to the distance between the centers of said serni~circular areas, said ñanges being mounted to rotate in said recesses, said rotor having a series of radial openings circular in cross section, the 3 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.