Патент USA US2105428код для вставки
Jan. 11, 1938. G, F, MAGLQT'Í'- 2,105,428 GEAR PUMP S EAL Filed June 2, 1954 IN VEN TOR. ‘ A T TORNEYS. Patented Jan. 11, 1938 2,105,428 UNITED STATES PATENT oFFicE ' 2,105,428 GEAR PUMP SEAL George F. Maglott, Cranston, R. I., assignor to Brown & Sharpe Manufacturing Company, a corporation of Rhode Island Application June 2, 1934, Serial No. 728,798 4 Claims. (Cl. 286-7) This invention relates to a gear pump for pumping liquid, more particularly a’liquid hav ing lubricating properties such as fuel oil for oil burners; and has for one of its objects the Cil provision of a seal which will both prevent the escape of the oil from pressure developed on the inside of pump and prevent any suction developed within the pump from drawing in air. Another object of the invention is the provi sion of a seal which will be unaiïected by the running out of line of the drive shaft for driving the pump. ` - _ ` Another object of the invention is the provision of a common means which will assist the seating of the seal against pressure developed in the pump and also assist the seating of the seal against suction developed in the pump. Another object of the invention is the circula tion of the lubricant about the. moving parts 20 and yet maintaining a seal 'of the lubricant in the pump casing. _ ’ ~ Another object of the invention is the pro vision of a circulation of the material pumped in such a manner that it will lubricate the mov 25 ing parts in a small pump by arranging certain of the conduits for the lubricant through the moving parts as distinguished from through the fixed part of the casing itself. v Another object of the invention is to cause the 30 lubricant circulation to assist in taking from the pressure seal some of the pressure which might otherwise be caused to be exerted thereon and thus reduce a chance of leakage through this seal. 35 elements; , Fig. 5 is a perspective view of the pump look 5 ing at the outside thereof and also illustrating a modified construction with reference to that illus trated in Figures 1 and 2. In the operation of liquid gear pumps, there has been considerable difficulty in maintaining a proper seal about the'drive shaft which extends Y through the casing and operates one of the gears. .If this seal were not tight when pressure of the liquid is developed in the pump, the liquid will be forced out about the drive shaft, whereas if the pump were not tight when there is a suction developed in the' pump casing, air will get in. With a small bubble of air'in the pump, 'the pump will hammer and knock and run noisy for a considerable length of time. This seal is often 20 caused to be imperfect by reason of the wobbling or the'getting out of line of the drive shaft to which the seal is frequently attached, and in this case I have provided a seal which is independent of the alignment of the drive shaft so that should the drive shaft be out of true line, the seal will be effectual to maintain the seal in the pump. Also, there must be some means provided for lubricating the operating parts of a gear pump of this character. Frequently, the liquid which is to be pumped is of a lubricating quality, such for instance as the pumping of oil and where this is the case, as in the uses for which the present pump is particularly designed, a circulation is Another object of the invention is the arrange provided of this liquid about the moving parts ment ofthe parts so as to maintain a hydrostatic balance of pressure on both sides of the pumping elements. so that fresh liquid is continually supplied to these parts to afford a more perfect lubrication rather than a stagnant lubrication which occurs in some pumps, in which case the oil will lose A further object of the invention is the provi 40 sion of a pump the parts of which are the same regardless of the direction in which it is to op erate which may be elected in finishing by merely choosing the Aarrangement of certain of -the formed -openings therein. 45 .With these and other objects in view, the in-vention consists of certain novel features of construction, as will be more fully described, and particularly pointed out in the appended claims. In the accompanying drawing: Fig. l is a sectional view through the pump; Fig. 2 is a sectional view on line 2-2 ofsFig ure 1; ‘ Fig. 3 is a sectional view on line 2-2 of Fig ure 1; 55 parts fragmentally and the arrangement of my novel sealing unit and drive transmission be tween the drive shaft and one of the pumping . v Fig. 4 is a perspective view showing some of the some of its lubricating properties and permits 40 heating within the pump. Sometimes in pumps of this character where there is a circulation of the oil, the oil is ex truded out of the pump and lost, whereas this invention contains the oil at al1 times in the 45 pump and seals it against escape. Also, in small pumps it is rather difficult to provîdea sufficient amount of stock for the for mation of a conduit for the lubricant, and in order to economize space, I have provided a channel through the drive shaft which operates the gears of the pump and by which'a very em- cient circulation is provided, and I have so ar ranged the circulation of the liquid in the pump that it cooperates with the seal to effect a. more 2 arcade-ae .complete seal by relieving pressure on the seal . during the running of the pump. The sealing unit is connected tothe shaft 28 of pressures, I maintain a hydrostatic balance in the pump on both sides of the pumping elements; and the following is a more detailed description by a key 5I entering a slot or recess ¿i9 in the shaft 20„and slot or recess 58 in the disc 3|, and -of a length and size „to more' or less loosely fit advantageous results may be accomplished:- ’ With reference to the drawing, I@ designates the body section of the pump, which is provided with an opening housing the gears II and I2, which mesh together and about which there is left a suction pocket I3 and a pressure pocket 15 I5 for the entrance and delivery of the liquid to therein and yet maintain its driving position. 'I_‘hus any rotation of the sealing means will cause a rotation of the shaft 25 while allowing the shaft 2@ to be entirely independent of the Isealing means IG so that any irregular running of the parts within the pump need not rock the seal from its seat. The sealing means is driven through the tongue 52 on shaft 35 exten-ding into the slot or recess 53 I provide cap sections or closure members in one in the disc 32. This slot is sufficiently large so 15. that there may be a rocking of the shaft 35 in the slot and any irregularity in alignment with of which there is- located suitable discharge and the shaft 30 will not be communicated to the disc be pumped. At either side of the body element, 20 5 Further, by my arrangement and transmission of the present embodiment of this invention, il lustrating the preferred means by which these 10 dit is provided with a ñange @l at its outer end, and is held in position by suitable bolt 38. 32 and thus accurate alignment of the shaft or suction conduits. One end cap section is designated I5, and the other end cap section I6 which'also has formed therewith a bracket portion Il in which the seal ing and driving means are largely mounted. The cap sections I5 and I6 are held assembled on 25 either side of th/e body section III by suitable bolts I8 and I9 extending through one of the cap sec tions, through the body section and threaded into the other cap section, whereby the sections are held in assembled relation sufficiently tight so 30 that there will. be no leaking of air into or pump true running in its bearings is not essential to 20 the maintaining of this seal- in its operating or working position. The shaft 35 is bushed as at 56. Oil is fed to the bearing through the open ing which is closed by a set screw 55 to keep out foreign matter. A shoulder 56 fixed on the shaft 25 30 is engaged by a plate 5T, which plate is held in place by reason of bolts d8 and which in turn serves to secure the sleeve and bushing in place » on the portion I'I of the cap section I 6. Should any pressure be exerted -on the sealing 30 means from the inside outwardly and liquid be ing of the liquid out of the casing. ` Pumping elements or gears II and I2 may be forced by the first disc 3 | , then the second disc 32 made integral with or mounted on shafts 2|J^and would be forced more tightly to its seat by the ad 2| to which they may be securely ñxed against dition of such pressure assisted. by the spring 38, 35 relative rotation. These shafts have bearings in the opposite cap sections; thus shaft 20 has' `a ' bearing 22 in the cap section I5, and 23 in the and thus from the inside provide a tight seal between the surfaces 45 and 46. Such pressure -might occur from a head existing in the storage tank when the pumping elements are not rotat ing. It is `also of importance that the seal be maintained against a low pressure developed in the pump from drawing in air due to a greater pressure outside, and in this case, the reverse will be true in that any air entering about the shaft 30 may pass the first disc 32, but this outside pressure will be exerted against the surface 39 of » disc 3| to force the disc 3| more ñrmly to its seat, , cap section I6, while the shaft 2| has a bearing 24 in the cap section I5, and 25 in the cap sec tion I6: In this particular embodiment of the invention, the suction conduit 2’6 and discharge condiuit 2`| are provided in the cap section I5, the former communicating with the suction pocket I3, while 45 the discharge conduit 2l communicates kwith the pressure pocket |4. Suitable connection may be had to these conduits by means of the threaded bores`28 and 29 for the intake and delivery of the liquid to be pumped. , The gear or pumping element Il is driven through its shaft 20 by means of a drive shaft 30 which is connected to the shaft 20 through a seal ing means which consists of a disc 3| and a disc 32, each provided Iwith tongues 33 and 34, which ñt into slots 35 and 36 in the coupling member 31, there being a helical spring 38 encircling the coupling member and engaging the inner sur faces 39 and 40 of the discs tending to force -them apart. The sealing unit is rotatably mounted in a bore 4| in the portion I1 of the cap section I6, . the end of this bore being provided with a finished seat 42 against whichl the finished surface 43 ofthe disc 3| engages to form a seal, the discbeing of a size substantially that of the bore 4| to be 65 guided in its rotation in this bore. A sleeve 44 is inserted into the bore `4| to an extent to retain the helical spring 38 under com pression, and the-tongues 33 and 34 in their re~ ' spective slots 35 and 36, although not sufficient to force the discs into ñrm engagement with the coupling member 31. The inner end 45 of this sleeve 44 provides a finished seat against `which the finished surface 46 of the disc 32 ‘engages to form a seal. The dis'c 32 is also of a size to be guided in its rotation by the bore 4|. The Sleeve also assisted by spring 38,‘and thus effectively prevent entrance _of air into the pump, which might cause it to knock. Thus, this spring acts inboth directions to assist' in preserving the seal in the pump, while both discs are unaifected by any of the- operating parts which is very often detrimental to pumps of this character. " This particular pump is designed for pumping oil a- liquid having lubricating properties and utilization may be made of the liquid for the lubrication of the moving parts of the pump, and I have taken advantage of this by providing cer tain channels to maintain a circulation of the liquid to be pumped about the bearings for the 60 shafts 20 and 2|. In the casing, I have pro« vided a conduit 60 which, as shown in Figure 1, is formed in the cap section l6'ìand extends up wardly from the y pocket at the end of shaft 2| to connect with the pocket at the end of the other shaft~20, and in fact, in order that I'may provide such a conduit„,I have drilled the casing from the outside and then blocked up theouter end of this conduit as at 6|. I have also provided conduits or openings 62 through the shaft 20 and a conduit 63 through the `shaft 2|, also a con duit in the casing from the'left hand end of the shaft 2|! to thesuction chamber I3, which con duit I designate 64. By this arrangement, any liquid which seeps into bearing 24 from the gear 2,105,428 ~ a I2, will Work its way along this bearing dto the pocket 65 at the end of shaft 2|, thence through invention being deñned and limited only by the terms of the appended claims. , the hole 63 in the shaft 2| to the ypocket 66 at I claim: 1. In combination, a casing provided with a bore and a pairof opposed end seats, a shaft ro tatably mounted in said casing, a drive shaft the opposite end of this shaft, thence through conduit 60 to and through the hole 62 and out through the conduit 64 to the suction chamber `I3 of the pump. Any liquid working into the bearing 25 will be conveyed to thev chamber 66 through conduit 60, hole 62, vand to the suction rotatably mounted in said casing and extending along said bore in a direction towards the first shaft/but terminating short of said shaft to leave y thence through a hole 62 to this conduit 64, while a space therebetween, and sealing drive means .10 through which said drive shaft and the other shaft are connected, said sealing drive means ìany liquid working ’into the bearing 22 will be conveyed to the .pocket 68 Which directly con 15 nects with conduit 64 and thus to the suction being interposed entirely between the ends of said shafts and comprising a .pair of movable discs in engagement with said seats, a coiled spring 15 chamber. Thus it will be seen that all thexbear ings are connected to the suction side of the pump, and any liquid leaking in from the pres sure side will be drawn back to this suction side, 20 and there will be provided a continuous cir between said discs for exerting pressure in oppo site directions against said discs to force them into sealing engagement with said seats, tongues on 10 conduit 64. Any liquid Working into the bearing, 23 Will be _conveyed to the end of the shaft and culation of liquid about these bearings in the chamber. A chamber or pocket 59 at the right hand'end of shaft 2D is in communication with the port 6d 25 and the suction chamber, and thus there is a vcontinual moving of any liquid from this pocket 69 towards the suction side of the pump andaway `from the disc 3|, and the continual movement away from this disc tends to lessen the pressure 30 on the disc, and thus this circulation assists in relieving any pressure in the pump tending to force any liquid out of the pump. ' Further, by my means of the arrangement of parts and circulation above mentioned, I maintain 35 a perfect axial hydrostatic balance of pressures on either side of each of the pumping elements. Each area is fully balanced both on the pump ing elements or gears themselves, as well as the pressures on the shafts 2@ and 2i, and thus this pump will operate a far greater length of time by reason of this balanced pressure than Where the pressure is greater on one side of the pump element than‘on the other, forcing it towards some surface which mustreceive the thrust com municated to it. _ Another feature of the present construction is that by the use of the same gears and the same castings, I may provide a pump which. may be ar-I ranged to run in a right or left hand direction, 50 although the chosen direction >must be deter mined before the pump is finished, as I must of necessity place the bore Sii on one side or the other„depending upon the direction the pump is to be run; for instance, in Figure 2, the suction conduit is said to be 2t and the bore @il must connect the bearing 22 with the suction side of the pump, thus if I desire to change the direc tion of rotation of the pump elements, it will be necessary for me to connect this bore 6d with 60 the opposite conduit 2ï, but as this is merely a drilling operation on the opposite side of the cap member, the identical casings may be used re gardless of the direction of rotation of the pump. I also may optionally provide a suction and pressure conduits in the cap section i6, as I have illustrated' in Figure 5, instead of in the cap sectionv I5. Thus I may select from several of , optional forms of construction without any‘ma- ' 70 terial changes of construction. said discs, and a coupling member having slots -to receive said tongues on the discs and located with 20 in and axially of said spring for connecting said discs for the transmission of rotation from one to the other. n 2. In combination with a casing provided with an elongated cylindricalI bore having a pair of 25 opposed seats, of a shaft rotatably mounted in said casing and provided with a tongue extending in said bore,`a drive shaft having a tongue and rotatably mounted in said bore, said drive shaft extending along the bore of said casing in a 30 direction towards the first shaft but terminat ing short of said shaft to leave a space therebe tween, and sealing drive means through which said drive shaft and the other shaft are connected for rotation, said sealing drive means being an 35 independent unit entirely disposed between the ends of said shafts and comprising a pair of discs in engagement with said seats and of such size as to be guided in rotation by said bore, a helical spring mounted between said discs and axially thereof for exerting pressure in opposite direc tions against said discs to force them against said seats, tongues on said discs, and a coupling member having slots to receive the tongues of said discs, said member being axially located with in said spring for connecting said discs for the transmission of rotation from one to the other, said discs having outwardly facing slots to receive the tongues provided on said shafts for the trans mission of rotation from one'shaft to another. .3. The combination with a casing having an elongated cylindrical bore therein within which is contained a pair of opposed annular seating surfaces, of a shaft rotatably mounted in said cas ing and extending into said bore, a drive shaft 551 in axial alignment with said first shaft,‘said drive shaft being rotatably mounted in said casing and extending inwardly along said bore towards the first shaft but spaced therefrom, and sealing drive means within said casing in axial alignment with 60 said shafts and interposed between the ends of the lati. er for transmitting rotary motion,.said sealing drive means comprising a pair of longitudinally movable discs having tongue and groove driving connection with the ends of said shafts and be 65 tween which said discs'are solely movable forv longitudinal movement, a coupling member hav ing tongue and groove driving ‘connection with said discs and co-axial therewith,.and a coiled spring surrounding said coupling and interposed 70 The foregoing description is directed solely towards the construction illustrated, but 'I de between the inner end faces of said discs for con sire it to be understoodv that I reserve the to move them in opposite directions and into seal stantly exerting endwise pressure upon said discs privilege of resorting _to all the mechanical îing engagement With the said casing seats. changes tò which the device is susceptible. the 4. In a device of the character described, the 75 4 n 2,105,428 combination with a casing having an elongated _ interposed betwen the ends of the same for trans-v cylindrical bore therein the inner end wall of mitting' rotary motion, said discs being of such which is provided with an annular seating surface and a shaft opening, of a shaft extending through said opening into said bore and terminating close to said seating surface, a sleeve within said bore and having an end seating surface thereon, a drive shaft journaled in said sleeve and in axial align ment with said ñrst shaft, said drive slîaft ex tending inwardly along -said borel towards said ñrst shaft but spaced therefrom, and a sealing drive device within said bore and comprising a pair of spaced longitudinally movable disc mem bers having a coupling sleeve interposed there between, said drive device being arranged in axial alignment with said shafts and entirely size as to be guided by the bore in their rotation therein, said discs having/a sealing surface on their outer ends, one- of which is adapted to engage the seating surface of the inner wall of said bore and the other to engage that on the end `of said sleeve, a coiled spring surrounding said coupling and interposed between the inner end fa es of said discs to exert end-wise pressure for 10 fo cing the discs apart and in sealing engagement with said seating surfaces, said discs having ton gue 'and groove driving connection with said coupling and said shafts.> ‘ GEORGE F. MAGLOT'I".