Nova Patents
US2279136A

Rotary pump

Abstract

This record has no abstract on file.

US2279136A, drawing sheet 1
Sheet 1 of 5

Term

Term ended

Expired 7 April 1959, 67.5 years ago.

  1. Priority and filed
  2. Granted
  3. Expired
  4. Today

13 claims: 12 independent, 1 dependent

  1. 1
    I claim:50 1. A sanitary rotary pumping mechanism for milk and other material containing fat globules or cellular constituents, comprising the combination of a gear casing provided with shaft supporting bearings, a pair of parallel shafts wholly supported by said bearings and having piston carrying working portions projecting through one wall of le casing, connecting bolts permanently mounted in the gear case and projecting therefrom parallel, to the working portions of the -- shafts, a pump chamber body, apertured to re 00 ceive said connecting bolts and projecting shaft portions, said body having housing sleeves axially enclosing the working portions of the shafts and sftinularly spaced therefrom, piston hubs detachably connected with the shaft ends in clos________ _ - · · - ” ---------i each provided with a pair of balanced pistons revoluble about the respective sleeves, sealing rings interposed between the sleeves and shafts, and a detachable front wall for the pump chainshafts, hubs and pistons, said shafts being free from bearing contact with any portion of the pump chamber.
  2. 2
    A pumping mechanism as set forth in claim 2 2,279,136 Hamp the piston hubs in place against the shaft shoulders 26. t Each hub 28 carries a pair of pistons 24 on diametrically opposite sides, the pistons being balanced upon the shaft, with substantially no tendency to set up shaft vibration. The pistons on the shaft II are advanced 90 degrees from those on the shaft 10, and they revolve in intersecting paths in a lobed cavity 28 formed in the body of the pump chamber, each sleeve 17 being j arcuately recessed at 30 in conformity with the circle traversed by the outer surfaces of the pistons on the opposing shaft. The inner faces of the piston hubs 23 are in running fit relation to the front ends of the sleeve :17, and the rear ends of the sleeves are closed by thrust collars 32 which are threaded to the rearwardly projecting ends of the sleeves with their internal diameters substantially corresponding to those of the shaft portions 18. Sealing rings 33, 34 and 35 encircle each shaft portion 18 and are held against the associated thrust collar 32 by a coiled compression spring 36, interposed between the sealing rings and the associated piston hubs 23. The rings 33 have reduced annular friction bearings upon the thrust collars 32 and normally rotate with their shafts. The ring 34 is preferably compressible on the shaft. Any seepage escaping past the piston hubs and sealing rings wifi be delivered into the cavity 16 in the rear wall of the pump chamber and allowed to escape through the bottom opening 88. Therefore, although the sealing rings are located within the body of the pump, they are exterior to the chamber or cavity which receives the liquid that is being pumped, and for all practical purposes they are outside of the pump chamber. They are located within the body in order that the working end portions of the shafts may be of minimum length and projection beyond the gear chamber bearings and maximum resistance to vibration. The pump chamber is composed of separable parts, viz., the body portion, which includes the back wall 14, the outer wall 15, and the sleeves 17, and a cap wall 40 doweled to the body at 41. The body is also doweled to the gear casing at 42, and bolts 43, having heads permanently mounted in the gear casing, extend through the pump body and cap, whereby both the body and cap wall of the pump chamber may be clamped to and supported from the gear casing by these bolts and a set of clamping thumb nuts 44. The clamping nuts 44, together with the nuts 25 which clamp the piston hubs in place, and the thrust collars 32 which receive the pressure of the clamping nuts 25 exerted through the compression springs 36 and the sealing rings, may all be adjusted in normal operating position without the aid of special tools, although special wrenches are preferably employed to secure the thrust collars 32 and nuts 25 in place. The thrust collars 32 are held against accidental rotation by a single locking block 46, held to the front wall W1 „ X1 „„.............. of the gear casing by a screw 46α. As best shown 65 . relation to the front ends of the sleeves and in Figure 4, this locking block 46 has flat faces u . - .----.— which abut some of the flat faces 47 of each of the thrust collars 32, thus preventing those collars from turning during operation of the pump. aetacname irunu—— There is a possibility that the clamping nuts 70 a ? from bearing contact with the 25 might tend to work lose during operation of Der οοα * lree ----·..... the pump, especially if carelessly adjusted to clamping position, or if adjusted by hand without the aid of tools. Ordinarily these nuts will remain in place, but during a prolonged pumping 75 2,279. 1, in which the rear ends of the sleeves are provided with removable thrust collars and the packing rings are held under resilient pressure in thrust relation to the hubs and thrust collars, the cap wall, piston hubs with their associated pis- 5 tons and the pump body being successively removable from the working ends of the shafts, and the thrust collars and packing rings being also separable from the removed pump body.
  3. 3
    In a pumping mechanism of the described class, a set of permanently mounted parallel shafts, each having one end portion provided with suitable bearings and the other end portion free from bearing contacts and adapted to serve as piston carrying working portions, a pump chamber formed in separable parts independently supported to enclose the working end portions of the shafts and provided with a lobed piston receiving cavity in which the working end portions of the shafts terminate, and pistons detachably connected with said working portions and revoluble in the respective lobes, said working portions of the shafts and their pistons being free from bearing contact within the pump chamber and said pump chamber and the pistons being removable from the working portions of the shafts and separable for cleansing purposes after each pumping operation.
  4. 4
    A rotary pumping mechanism for liquiform foods, having, in combination, a gear case provided with shaft supporting bearings, a pair of parallel shafts Intergeared to revolve in opposite directions and wholly supported in said bearings with free working end portions projecting frcm the gear case, a pump chamber body having inlet and outlet ports and provided with sleeves concentric with working portions of the shafts and annularly spaced therefrom, said body having a lobed piston receiving cavity, with the walls of each lobe concentric with one of the sleeves, piston hubs detachably connected with the free ends of the shafts in running fit relation to the ends of the sleeves and each provided with a pair of balanced pistons revoluble in one of the lobes in paths which intersect those of the other set of pistons, and a detachable cap wall for the pump chamber spaced from the shaft ends and normally closing the piston receiving lobes.
  5. 5
    A sanitary rotary pumping mechanism, having in combination a gear casing provided with shaft supporting bearings, a pair of parallel shafts wholly supported by said bearings and having piston carrying working portions projecting through one wall of the casing, a pump chamber having a body detachably connected with said casing wall and having sleeve housings concentric to the associated portions of the shafts and annularly spaced therefrom throughout their length, removable thrust collars normally closing the rear ends of the housings, rotary seals carried by the shafts within the sleeves in thrust relation to said collars, a retaining block normally. secured to said wall of the gear casing between the thrust collars and adapted to hold them against rotation, piston carrying hubs secured to the front ends of the working portions of the shafts and each provided with a set of balanced pistons rotatable within the pump chamber body, clamping nuts normally holding said hubs in position, and a removable front wall for the pump chamber body supported thereby out of contact with the shaft ends and piston hubs, said hubs and pistons being in running fit relation to the interior surfaces of the pump chamber, and the working portions of the shafts 138 3 being sufficiently short and sturdy to normally hold thejjiston hubs and pistons out of bearing contact with the walls of the pump chamber, with a clearance insufficient to permit material loss of efficiency by flow of liquid from the high pressure to the low pressure sides of the pistons.
  6. 7
    In a rotary pump of the described class, the lo combination of a gear chamber, of a set of parallel shafts having supporting bearings wholly mounted in the gear chamber and having working ends projecting through apertures in one wall of said chamber, each said shaft having an an20 nular flange and concentric oil sealing rings closing the aperture in said wall, washer-shaped slinger plates each in pressed fit relation to one of the shafts in a position to intercept fluid tending to follow the shaft in either direction from 25 or into the gear chamber and to deliver such fluid centrifugally, a pump chamber enclosing the working ends of the shafts and having its inner wall recessed to receive liquid d’scharged from from the slinger plates, and pistons carried by 30 the shafts and adapted to revolve in intersecting paths within the pump chamber, said shafts and pistons being free from bearing contact within the pump chamber.
  7. 8
    In a rotary pump, the combination of a pis 3 > ten carrying shaft, a sleeve of greater internal diameter than the shaft and through which the shaft passes with continuous annular clearance between the shaft and sleeve, a piston hub closing one end of the sleeve, a collar closing the 40 other end thereof, and packing rings between the shaft and sleeve in thrust relation to the piston hub and collar, said piston hub having a balanced impeller revoluble about the outer surface of the sleeve in running fit relation 45 thereto.
  8. 9
    In a sanitary rotary pump for liquiform foods, the combination of a shaft supporting gear casing provided with parallel shafts having working end portions projecting from the casing, 50 a pump chamber having separable walls enclosing said end portions, means for detachably clamping said walls to the gear casing, and pistons detachably secured to the ends of said shaft portions and supported thereby in running fit 55 relation to the walls of the chamber, with a tolerance of less than .005 of an inch, the pump chamber being without bearings for the shafts and pistons and said shafts being wholly supported from said gear casing and sufficiently sturdy, 60 and the rotary parts sufficiently balanced, to substantially avoid vibratory or wearing contacts of surfaces exposed to the pumped material.
  9. 10
    A rotary pump having interacting segmental pistons wholly supported from a gear case by 65 intergeared parallel shafts revoluble in opposite directions, in combination with a removable pump body having a back wall supported by the gear case, said body having an open piston receiving lobed cavity in front of the back wall, and said 70 back wall being apertured to allow the respective shafts to extend across the cavity at the axis of each lobe, sleeves concentric to the respective shafts and supported from the back wall with the pistons in running fit relation to the outer 75 surfaces of the sleeves and the opposing lobe sur- faces, piston supporting hubs, eac *\ ^fl^ffiX to S ί/οη^ηΤο?^ associated sleeve, and a cap Sts _j with the body in spaced relation to tne snaiis affiftSa»•““'S ££ in winning fit relation to the cap, said sleeves being spaced from the respective shafts and prS Sth interposed relatively toed and rotary coaling devices adapted to obstruct the flow of M«S e through the shaft receiving apertures in ^ll^In a rotary pumping mechanism, the combination of a gear chamber and ta 0 Ka?chaXTsai?fite having free end portions projecting into the pump tons splined to the free end portions of the sbaf Jf’ and manually removable clamping nuts for securing the Pistons to the shafte, bar being formed in cap and body portions, hav ing, in common, manually releasable connections ’‘S^ffiyS^P. comprising the combination of a gear cSber, P a set of intergeared paraflel shafts having their bearings mountiri to the gear chamber, with otherwise unsupported ing end portions extending through one wall of tbe abambar a pump chamber having a manSy Stable front wall, and a rear wall normX si fted by said wall of the gear chamber and recessed to permit drainage, shaft receiving sleeves extending forwardly from said rear wall into the pump chamber, removable 35 packings normally interposed between the sleeves and the shafts, piston having hubsmanuaUy removable from the free ends of the shafts and normally supported thereby in running fit relationship to the sleeves and the walls of the pump < chamber, said hubs normally closing the front ends of the sleeves, thrust collars no ™ aU L ing the rear ends of the sleeves, manually remo able, nJte for holding the piston hubs to the shafts, and other manually removable nuts for holding the pump chamber cap and rear wall to the gear case—all parts of the pump being removable by removal of said cap nuts and piston clamping nuts, whereby all of the parts may be separately cleansed. ,,
  10. 11
    13. In a rotary pumping mechanism of the described type, the combination of a gear chamS.Tsetiof parallel shafts permanently mounted therein, with free end man* from the gear chamber and naiiy detachable pistons on their a pump chamber formed in manually removable 8,979,136 and separable parts, said pump chamber being supported from the gear chamber and ρ £ 0 /^ with°shaft receiving sleeves of greater interna diameter than the shafts, and housed between the shafts tons and said projecting ends of the shafts being housed within the pump chamber and wpported by the gear chamber mountings free from bear tag contacts with the walls thereof. .
  11. 12
    14 m a rotary pumping mechanism, the com biS’tiS of a gw chamber, a set of Intergeared parallel shafts wholly supported in gearchamber mountings and l»ving worictag nroiectlng through one wall of said chamber, 15 pump chamber formed in separable parts and mXuyConnectible with the gear chamber to be supported thereby in housing relation to the having reduced front ends adapted to receive piston hubs in splined relation thereto, and “ tremities threaded to receive clamptag nu adapted to fix the position of the Piston hubs on the shafts, and pistons s ?PP°^ d [θspective hubs to revolve about the shafts tata ^rear-ting paths, said shafts, piston hubs and pistons being supported to revolve in running At relationship to the fixed walls of the PW^chamber and said walls and pistons being manuaUy removable to expose the working ends of the shafts and permit separate cleansing of all parts of the pump after each pumping operation.
  12. 13
    15. A sanitary rotary pumping mechanism for milk and other liquiform food material, -=ompristag the combination of a pump body formed in i manuaUy separable parts and having an apertured wall provided with sleeves concentric to the respective apertures, each sleeve having a free end portion supported from said wall within the body, shaft bearings exterior to the body, shafts mounted in said bearings wito free working end portions extending axially through said sleeves in spaced relation thereto, piston hubs each detachably secured to the front end o one of the shafts and provided with balancedPistons revoluble about the free end portion of the> associated sleeve, thrust collars, concentric with the respective shafts and substantially closing the rear ends of the sleeves, and rotary sealing rings internosed between the shafts and sleeves in thrust relation to said collars and the piston hubs—the shafts, pistons and piston hubs being wholly supported from said shaft bearings, and all movable portions within the pump body being free from rubbing contact with any portion of the body. GILBERT R. FUNK.
Independent claims12