US2986095A - Sanitary pump - Google Patents

Description

y Mayan, 1961 QA, NAMUR 2,986,095

' SANITARYPUMP Filedoct. 5, 195e 2 sheets-sheet 1 c. A. NAMUR SANITARY PUMP May 3o, 1961 2 Sheets-Sheet 2 Filed oct. 5.51956 INVENTOR. BY @d @/Vamzf m fw. 2 9% 2,986,095 p `smsnTAnY PUMP r c?. A. Namur, Mmviue, Pa., assigner :o Gli-tbn Maul 'Company Inc. Millville Pa. a `co ration of Pennsylvania rpo Filed Oct. 5, 1956, Ser. No. 614,267

7 Claims. (Cl. 10S-lll) compact and relatively simple construction and which ses Patent O lend themselves readily to.easy and rapid disassembly,

cleaning, and reassembly. Still more specifically stated, this invention also relates to the unique arrangement for demountably and independently supporting the sections of thecasing of the improved pump 'so that the casing suchl seals during theassembly operation'sand to accurately positionthe sections of the casing relative to one` another and relative to the pump shaft and impeller.

-This application is a continuation in 'part of the copending application Serial No. 310,837 fled'September 22, i952 now matured into Patent No. 2,784,673.

In the use of pumps employed in the handling of readily perishable food products it is essential that such pumps be frequent-ly disassembled and thoroughly cleaned and reassembled. In many instances such pumps are from time to time connected into different ow systems making the ready adjustment of the outlet or discharge connection desirable. Lengthy operations involving the disassembly, cleaning, and reassembly of a pump always entails increased operating cost and frequently entails bothersome interruptions of processing'operations. Simi ilarly, pumps which require numerous adjustments to f secure satisfactory operation also increase cost of operations.

It-is, therefore, one of the primary objectives of this invention -to provide a centrifugal pump of the sanitary type, of relatively simple and compact design, which may be easily and quickly disassembled, cleaned, and `reassembled, and which automatically adjusts itself into predetermined operating position during the assembly operation, and which'whe'n assembled will operate at its maximum efliciency without the specific adjustment of any of its component parts.

A further objective of this invention is to provide an improved structurein a centrifugall pump wherein the parts of the casing and seals are of such a construction that they may be arranged upon the pump support in anydesired angle of rotation without affecting the efiiciency of the operation of the pump and permit the arrangement of the pump discharge connection at any de-` i casing, illustrating a sectional arrangement of the casing an improved structure in a pump wherein the various l resilient and elastic seal or packing elements are so supported in the various parts of the pump as to preclude lsuch seal or packing elements from becoming easily displaced during the pump assembly operations. j

The foregoing and other objectives, important novel features and advantages of this invention willbecome more apparent and be more easily understood upon examination of the following description thereof and the accompanying drawings and the appended claims. It should, however, be understood that, without desirejof limitation, the invention will be described and illustrated as the preferred embodiment of the invention in a sanitary .type of centrifugal pump. Certain changes4 and variations may"suggestthemselves to those skilledin the pertinent arts, which changes may not, however, depart from the spirit of this invention and may come within the scope of the appended claims.

In the accompanying drawings: j

Figure 1 is a side elevational view, partially in broken away vertical sectionl of the improved centrifugal pump unit embodying the present invention;

Figure 2 is a left hand orfront elevational view of the pump unit shown in Figure l of the drawings;

Figure 3 is a view of the front face of the rear section or head of the pump casing;

Figure 4 is a side view of the rear head of the pump seal packing; and v Figure 5 is an enlarged vertical fragmentary view partially in section showing the interrelation of the edge portions of the front and rear pump heads at the locus of coaction with the pump casing seal and pump casing support ring.

Referring to the drawings, in which like elements are identified by like numerals,l 1 represents an electric driving motor enclosed in a housing and having a central rotary power shaft 2 which is mounted in supporting bearings (not shown) which are adapted to support shaft 2 against radial and axial thrust. A frame 3 is rigidly secured to one end of the housing of motor 1 and extends longitudinally from one end of motor 1 surrounding the shaft 2. A coplanar support yoke element or ring 4 is formed integrally with the frame 3 at the left hand l or free or outward end thereof as viewed in Figure l,

improved structure for a pump wherein such elements j of the pump as the casting sections and seals are so constructed that they are self-aligning when assembled and are secured into aligned operative position by the tightening of a single and quickly tightenable and quickand is concentric with or coaxial with the shaft 2 for supporting the sectional casing 5 of the improved pump.

The support element or ring 4 is joined to the frame 3 along the rear inner or right hand edge of ring 4 and is pro'vided with two outwardly converging or beveled annular side walls 6 and 7 which are concentric or coaxial with the shaft 2. The outer edges of front side Wall 6 and rear side wall 7 terminate in a cylindrical peripheral outer wall 8 for the ring 4.

The cylindrical outer wall 8 of support ring 4 is coaxial with the shaft 2 and side walls 6 and 7 and is perpendicular to the plane of ring 4. As illustrated in Figure l. the side walls 6 and 7 of ring 4 converge outwardly at equal angles to the axis of shaft 2. The inner wall 9 of the ring 4 is cylindrical and parallel to the outer wall 8 and is coaxial with shaft 2 and wall 8. A right angle groove 10 is provided in the front inner edge of ring 4 intermediate the wall sections 6 and 9 of ring 4 and opposite the locus of juncture between the ring 4 and the end of the frame 3. Groove 10 is defined by a cylindrical surface 11 parallel to' wall 9 and extending rearwardly from the inner edge of wall 6 toward the frame 3, and by s n annular surface 12 which is parallel to the plane of ring 4 and which extends perpendicularly outwardly from the forward edge of wall 9 to join the rear edge of surface 11. Surfaces 11 and 12 are concentric with shaft 2 and the surfaces 6, 7, 8, and 9.

The sectional pump casing is comprised of two sections, the front dr left hand section 13 as viewed in Figure l. being generally cup shaped and generally cylindrical. The rear head is identified by the numeral 14. Front head 13 has a central inlet passage element 15 coaxial with shaft 2 and with the remainder of the head 13. The body portion of the front head 13 consists of a substantially coplanar and circular front face 16 centrally carrylng the outwardly extending inlet passage element 15. A cylindrical side wall 17 extends rearwardly from the outer circular edge of face 16 concentric with the axis df shaft2 and support ring 4. A tlange 18 extends rearwardly and outwardly from the rear or right hand edge of wall 17, as viewed in'Figure l partially overlying groove adjacent to wall 6 of ring 4 and completely overlying and snugly abutting against the adjacent and parallel and complementary beveled wall 6 of support ring 4. Cylindrical flange 19 extends rearwardly from the rear or right hand edge of flange'ltl as viewed in Figure l, and partially overlies and snugly abuts against the complementary and parallel o'uter cylindrical wall 8 of support ring 4. An outlet or discharge passage element 20 extends outwardly from the outer zone of face 16 of the front pump casing head 13.

The rear pump casing head 14 of pump casing 5 comprises a substantially coplanar circular disk, having a central aperture 21 coaxial with shaft 2 and support ring 4. Rear head or disk 14 is supported perpendicular to the axis of shaft 2 and parallel to the fro'nt face 16 of front head 13, and parallel with the plane of support ring 4. A seal seat 22 is countersunk in the rear face 23 of rear head 13 about the'central aperture 21, with which aperture 21 the seal seat 22 is concentric. The circular rear face 23 is parallel to the circular front face 24 of rear head 14. Each of the faces 23 and 24 terminates at their outer peripheral circular edges in cylindrical coaxial surfaces 25 and 26 respectively which surfaces extend toward one another and which are coaxial with the axis of ring 4 and shaft 2. The surface 25 has a greater diameter than the surface 26. The inner edges of surfaces 25 and 26 are joined by a groove 27 the inner portion of which is defined by a re-entrant circular surface 28. Groove 27 comprises a seat for a seal or packing ring or gasket 29 which is seated snugly as by a close t or by slight'ten sionagainst the re-entrant curved surface 28 and which gasket 29 is a circular gasket having a circular cross section taken radially of the head 14. T'he dimensions o'f the gasket 29 are such that it must be stretched slightly tobe placed into groove 27, and when assembled under slight tension in groove 27 but without compression the exposed surface thereof does not extend radially of head 14 out beydnd the cylindrical surface 25 of head 14 nor extend longitudinally out beyond the plane of the front 'face or front surface 24 of head 14.

ln operative position. when head 14 is assembled in support ring 4 the outer edge portion of rear face 23 is parallel to and abuts against and completely overlies the complementary and parallel surface l2 of groove 10 in ring 4,'while the cylindrical surface 25 abuts against the complementary and parallel and coaxial cylindrical surface 11 of groove 10. The relative dimensions of head 14, gasket 29. and ring 4 are such that in such operative position the outer surface of the uncompressed gasket 29 would extend-through an imaginary inward extension of the beveled surface or wall 6 of ring 4 and the gasket 29 is therefore compressively engaged by the inner surface of flange 18 of front head 13 of pump casing 5, thereby compressively distorting gasket 29 into sealing engagement with the inner adjacent surface of flange 18 of head 13,

4 the cylindrical surface 11 of groove 10 in support ring 4 and the surface of the gasket seat o'r groove 27 in rear head 14.

The axial thickness of rear head 14 is such that the front face 24 thereof extends leftwardly or forwardly, as viewed in Figure 1, out beyond the front surface ring 4, to such an extent that an extension of the surface of beveled wall 6 of ring 4 would intersect the plane of the front surface 24 of head 14 at approximately the outermost peripheral edge of surface 24 but would not contact the cylindrical wall 26 defining the outer edge of 24. The flange 18 of front pump head 13 overlaps the portion of the groove 10 and the portion of channel 27 adjacent the inner edge of surface 6 and cylindrical wall 11, and such overlapping extends into close proximity to the outer peripheral edge of the inner face 24 of rear pump head 14, thereby compressively trapping packing 29 within a space defined by the channel or packing seat 27 the cylindrical surface 11 of groove 10 of ring 4 and the overlapping inner surface of ange 18 of frontv pump head 13.

An impeller shaft 30 which comprises a coaxial extension of the motor power shaft 2 is drivingly keyed to shaft 2 and telescopically extends into pump casing 5 through co'axial aperture 21 in rear head 14. Spaced and parallel impeller pivots 31 extend from the front end of shaft 30 substantially through the interior of the pump casing 5 parallel to the axis of shafts 2 and 30. Pivots 31 are spaced from the axis of shaft 30 less than the diameter of aperture 21 in rear pump head 14 so that the rear head 14 may be readily telescoped over pivots 31 and the frdnt end of shaft 30. Impeller elements 32 are pivoted at their inner ends to pivots 31 and in operation are caused by centrifugal force to extend outwardly with their free outer ends extending reasonably close to the side wall 17 of the pumping casing 5. A single spring clip element 33 is rcleasably secured to the free ends of pivots 31 to lock the impeller elements 32 to the pivots 31.

To seal the aperture 21 about the shaft 30 there is provided a rotary seal unit including a rotary seal ring 34 coaxial with shaft 30 and carried by shaft 30 outwardly of rear head 14 with the smooth seal face 35 of seal ring 34 sealingly engaging the complementary parallel and smooth at and lapped seal face 22 in the outer and rear central surface of the rear head 14. The complementary seal surfaces 22 and 35 are perpendicular to the axis of shaft 2 and parallel to the plane of rear head 14 and parallel to the plane of support ring 4. Seal ring 34 is provided with an internal groove 36 for snugly receiving and supporting an elastic and resilient circular seal element 37 which is sealingly seated in groove 36 and sealingly compressed against the outer cylindrical surface of shaft 30. Seal ring 34 and seal element 37 turn with and are carried by shaft 30 over which they are telescoped. Seal ring 34 is urged into engagement with seal face 22 of pump head 14 by a compressed coil spring 38 telescoped over shaft 30 between ring 34 and compression collar 39 keyed to shaft 30 outwardly of pump casing 5 to the rear of pump head 14.

To rcleasably lock the pump casing 5 in operative position on support ring 4 on which ring 4 casing 5 may be readily rotated prior to being locked in position, there is provided a clamp band 40. Clamp band 40 may be formed of a channel shapedI strip of material, such as steel, which has been formed intov a substantially circular configuration with the spaced side walls 41 and 42 conv verging outwardly parallel to the outer wall surfaces 6 and 7 of support ring 4. Side walls 41 and 42 of clamp band 40 terminate at their outer edges in a substantially cylindrical wall 43 spaced from and parallel to the cylindrical wall 8 of support ring 4 and cylindrical flange 19 on front pump head 13. The wall elements 41, 42, and 43 are all concentric with the axis of shaft 2 and the walls 41 and 42 are spaced one from another so that the wall 41 partially overlies and compressively abuts against the complementary and parallel surface of beveled flange 13 place upon support ring 4.

of front pump head 13 while the rear wall 42 of clamp band .40 overlies and compressively abuts against the l complementary and parallel surface of'wall 7 ot support ring 4. y

To tighten clamp band 40m/er ring 4 and the anges 18 and 19 of front pump head '13 a tension screw 44 is vhinged at 45 to the lower end of band 40 and extends upwardly through a compression tube 46 hinged at its lower end at 47 to the upper end of clamp band 40 as shown in Figure 2. A tightening nut 48 is threaded onto the upper end of screw 44 and compressvely engages the upper end of compression tube 46, thereby drawing the ends of clamp band 40 toward one another and tightly clamping band 40 .about support ring 4 and pump head ange 18 to securely lock sectional pump casing 5 in port ring 4. The radial spacing of head 13 is determined by the snug telescopic t of cylindrical ange 19 over the complementary cylindrical coaxial outer wall of support Similarly, upon the tightening of clamp band 40 the engagement of ange 18 of front pump head 13 with pump casing gasket 29 forces the peripheral edge of rear pump head14 back into seated position into groove 10 interiorly UlA agences tions provided with `outwardly converging annular andV concentric radial wall segments and a mid section therebetween, said mid section being radially thicker than said front and rear portions, said support device being provided with an internal groove for receiving the peripheral outer edge of a casing section to be supported thereby.

2. A support device according to claim 1, wherein said y annular ring is provided with a cylindrical outer peripheral of supporty ring 4 with the complementary cylindrical and coaxial walls 11 of grooves 10 and 25.0f head 14 in snugly telescoping arrangement to determine thefradial spacing of head 14, and with the rear face 23 of head 14 abutting against the rear complementary wall 12 of groove 10 to determine the axial spacing of head 14.

wall coaxial with said ring and a cylindrical inner wall section parallel to said outer peripheral wall.

3. A support device accordingA to claim 2, wherein said internal groove is defined by two annular and coaxial groove walls, the first groovewall being coaxial with and parallel to said cylindrical outer peripheral wall of said support device and joins the inner edge of one of the outwardly converging annular radial wall segments and the second groove wall being perpendicular to said first:v groove wall and has its inner edge concentric with and joining the cylindrical inner wall section of said support device.

V4. A supported casing, comprising, in combination, a frame, support means having inner and outer portions and being carried by said frame and adapted for supporting a sectional casing, a sectional casing supported upon said support means, the sections of said sectional casing having juxtaposed outer edge portions of a configuration Such tightening of clamp band 40 also compresses casing v gasket 29 into sealing engagement with front and rear heads'l3 and 14 and support ring 14.

head 13 is supported outwardly of support ring 4 and wherein head 14 is supported inwardly of support ring 4. also causes rear head 14 to compressively and sealingly engage seal face 22 of head 14 against seal facev35 of seal ring 34which is sealed to shaft 30 and compress spring 38 between ring 34 and compression collar 39 carried byshaft 30. thereby sealing aperture 2l in rear pump head 14 and placing the pump in condition for operation. 1 v

To disassemble the improved pump it is only necessary to loosen and remove clamp band 40 to permit the removal of front pump head'l3 from support ring4. Thereafter upon the removal of impeller clip 33 the impeller elements 32 may be removed from pivots 3l and rear pump head 14 may then be drawn over the end of shaft 30 and pivots 31` and head 14 and packing 29 may be removed from support ring 4. Thereafter. the

seal ring 34, seal 37 and seal spring 38 may be removed from shaft 30 by drawing them over the end of shafty 30 and pivots 31. The assembly of the pump may be accomplished by following a reverse procedure from that described for the disassembly operation.

From the foregoing description of this invention and from the. accompanying drawings, it willv be apparent that this invention realizes the introductorily enumerated objectives respecting the improved pump. which pump possesses the hereinbefore listed and indicated advantages, and provides a new, unique and useful pump. To those familiar with the pump art it may be apparent that certain changes may be made without departing from the scope of the invention.

Havingthus described and illustrated the preferred embodiment of this invention in van improved sanitary type of centrifugal pump, theinvention is not to be interpreted` complementary to and abutting against different portions of said support means, one section of said sectional casing surrounding and being supported outwardly of said support means and abutting against the outer surface of said support means and one section of said sectional casing being surrounded by and being supported inwardly of said support means and abutting against the inner surface of said support means, each of the sections of said sectional casing being supported independently of another section, said support means being provided with annular and concentric outer wall segments converging outwardly and said section of said casing supported outwardly of said support means being provided with an outwardly extending flange parallel to and complementary to and abutting the adjacent one of the outwardly converging wall segments of said support means.

-5. A supported casing according to claim 4, wherein said support means is annular and is provided with a cyl= indrical and radially outermost peripheral wallconcenq tric with the axis of said support means, said cylindrical and radially outermost peripheral wall joining the outer extremities of the outwardly converging side walls of said support means with which converging side walls said radially outermost peripheral wall is coaxial.

' 6. A supported casing according to claim 5, wliterein said section of said casing supported outwardly of said support means is provided with a llange extending axially from said outwardly extending flange, said angeextending axially being parallel to and complementary to and vabutting the adjacent cylindrical outer peripheral wall of said support means.

7. A supported casing according'to claim 4, wherein said support means is substantially ring shaped and has a cylindrical outer wall and is provided with an internal groove which groove is defined by two annular and coax-- wall of said groove and the adjacent portions of the sec tions of said sectional casing, a resilient and circular gaskct of circular radial cross section fitted snugly under compression into said channel. said gasket sealingly engaging the adjacent surface of said support means and the adjaccm surfaces of the sections of said sectional casing.

References Cited in the file c f this patent UNITED STATES PATENTS Dalull Aug. 4, 1942 Lipe et al. Jan. 11, 1949 Hollerith May 6. 1952 Martinet et al. July 8. 1952 Creasy May 10, 1955 Zozulin May 15, 1956 Guinard May 6, 1958 FOREIGN PATENTS Austria Feb. 25, 1954 France Nov. 10, 1954

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