US 2283348 A
Description (OCR text may contain errors)
ADAM ETAL PUMP Filed Dec. 21, 1939 4 Sheaths 2 ag WLQQQ} j 'ucntow Hanna.) anmns,
May 19, 1942. H. E. ADAMS In-AL 3 3 mm Filed Dec. 21 1939 tweets-sheep: a
flapoznwmma, Q #1240904 z May 19, 1942. H. E. ADAMS HAL Prim" Filed Dec. 21, 1939 4 Sheefi-Sheet 4 Mano/.0 awn/flue, (1440.90 mmqras,
Patented May 19, 1942 UNITED STATES PATENT I o azaasis PUMP South Norwaik, Conn, and Rates, Corning, N. Y.; said Man! Harold B. Adams, WiilardA. amino: ta Nash or'nlk, cm, and laid Katee Work, Oorning,N. York I rica Company, South a corporation of Connecticut.
assignor tov Glass a corporation of New Application December 21, 1939, Serial se is ,..(o1. zsrss) 13Claims.
This invention relates to pumps. and more particularly to a pump assemblage. of casing, impeller, driving means, and frame for the casing, wherein the casing and impeller parts are formed of corrosion resisting material and, therefore, particularly applicable to the handling of acids,
. and the like.
An object of the invention is to provide a pump construction, wherein substantially all of the parts that will contact in any manner with the fluid being pumped are formed of corrosion resisting material.
Another object of the invention concerns a centrifugal liquid pump in which the pump elements that come in contact with the fluids being pumped are formed of vitreous material, such as glass, or like refractory material. In this connection it has been found that glass is the most desirable because of its high resistance to corrosion from most acids, and because of its adaptability in handling liquids containingacids under the most eflicient sanitary conditions.-
Another object of the invention particularly concerns all glass pumps and means whereby they may be satisfactorily sealed against escape of fluid without, in so doing, developing suflicient localized heat to destroy the parts by differential ture is a hazard, and-accordingly it is a further herein, it is desirable to provi de for quick repair and replacement of wom parts, and to this end there is disclosed a novel arrangement of stumng box elements and retaining members which promotes ease and dispatch in the assembly and disassembly.
A further feature of the invention is the provision of means within the pump chamber by which the pressure of fluid on the stufling within the stuffing box is materially reduced so'thatan effective seal may be maintained with -a limited degree of pressure and a corresponding relatively slight generation ofheat within the sealing means.
Considering that the'impeller of the pump, as
well as the casing, is formed of materials of relativel'y low tensile strength, and therefore frangible in nature, it is still'another and an important impeller.
object to construct a pump in which is provided a strong metal frame, or housing, which not only functions in the operation of the pump, but it is devised to support the pump casing under controlled pressure, in a mannerto minimize crushfrom flying fragments, in the event that a breakage should occur.
One feature of the invention is concerned with the mounting of the pump casing within such a frame or housing in a manner which is protective to the casing while, at the same time, holding the casing firmly and securelyduring normal op- ,ing or breakage, and also to afford protection- This latter object contemplates the formation of a joint between one member which acts as a moving driving member, and another member which is driven by said moving member, of more or less general application, but particularly adapted to uses in connection with a pump of the type herein described.
. The invention has particular application, but is by no means limited thereby-,in Joining a rotary glass impeller of a pump, to a metal drivin member or shaft of the type illustrated and claimed in aco-pending U. 8. application of Harold E. Adams, Serial No. 275,755, filed May 25,
' A particular problem arises in the joining of a frangible -rotary member, such as an impeller,
constructed of glass, to a metal driving member.
The strength of the materials in tension, in a rotatable member formed of such materials, as herein contemplated, makesit imperative that the joint between the metal driver and the frangible driven member be somewhat resilient, yet free of play. By the construction of the present invention ajoint' is provided which overcomes these difficulties in a very efllcient and economical manner, and the invention contemplates the use of a bonding material between the driving and driven members, which'is resilient in nature and has a lower modulus of elasticity than the members which are joined together. I
' One of the objects of the invention, particuiarlywith reference to the joint between the drive shaft and the glass impeller, takes into conradially overhanging or radially overlapping surfaces on the drive and driven members.-
A further feature of the invention is the sion of a Joint structure employing a bonding medium between two preformed parts in which any possible shrinkage of the bonding'material will result in a further strengthening of'the mechanical interengagement of said parts.
Although the construction and operation of preferred forms of the invention are illustrated and described, it will be understood that they are intendedonly as illustrative and not as limiting, it being understood that the invention is not to be limited, other than as defined by the claims hereinafter appended.
To the attainment of the foregoing, and other objects which will appear as the description proceeds, reference is made to the accompanying drawings, in which: a
Fig. 1 is a sectional elevation of a centrifugal pump showing oneapplication of the present invention therewith;
Fig. 2 is an exploded perspective view partly broken away, illustrating a joint constructed in accordance with the present invention, between a metal drive member and an impeller removed from the drive shaft and without the bonding material;
Fig. 3 is anenlarged fragmentary sectional ele- Fig. 4'is a section taken substantially on the V plane of line 4-4 of Fig. 3 which section is taken through the radial grooves;
Fig. 4a is a fragmentary enlargement of a part of Fig. 4; a
Fig. '5 is a section. taken substantially on the, plane of lines H of Fig. 3 when mounted on the drive shaft, said section being taken on a plane spaced from the radial grooves;
6 is an elevation of a pump embodying a slightly modifled form of frame or housing;
Fig. "I is a central section taken on the line "1-1 of Fig. 6;
in Fig. 8; and
Fig. 10 is a detail partly in section showing the mode of securing the frame sections together in the form of invention illustrated in Figs. 8 and 9.
Referring now more speciflcally to the drawings,whe rein like reference numerals designate like parts, and with particular reference to Figs.
1 to 5, it will be seen that the pump assemblage comprises a supporting frame or housing A, preferably made of metal, having acid resisting qualities or acidresisting coatings, a sectional centrifugal pump casing indicated generally at B, which casing is formed of a head section I and a crown A centrifugal pump chamber l3 is formed by the casing sections it and II and in the chamher is, mounted the centrifugal impeller I for provi- -vation through the drive and driven member, 'removed from the drive shaft;
pumping liquid. The eye orf-inlet port of the pump casing is indicated at H, and the outlet port (not shown) leads from the periphery of the casing B. In the center of the volute section, an integral stufnng box extension or neck It is formed and .this extension provides the stufllng box or seal chamber for the packing or sealing elements I! through which the hub I8 of the imp'eller I extends. In practice, the packing and sealing elements I! provide a mechanical seal between the chamber and the hub to seal the pump chamber from the exterior of the casing and prevent leakage of'the liquid being pumped,
and at the same time prevent air from entering the casing and impairing the ,suction of the pump. While the preferred form of the pump of the present invention is made of glass substantially as shown in the drawings, it is obvious that certain of the mechanical details therein illustrated may be modified without eliminating. the features of the present invention. Similarly the impeller and easing may be made of high silicon iron, or high chromium, or high nickel steel, all of which are sufllciently resistant to corrosion for application to pumping certain corrosive liquids while retaining certain other features of the invention. However, these metals like glass, are
very difficult to vmachine and are usually machined by grinding, which characteristics are the same as glass used in the preferred embodiment in the'present disclosure.
In order to produce a'successiul glass or vitreous pump capable of handling corrosive liquids, it is essential that all parts of the pump coming in contact with such liquids be formed from glass or whatever resistant material is being employed. In a centrifugal pump of the type disclosed this requires that the shank it of the impeller land the sleeve IQ of the casing B be formed from glass as integral parts of their respective bodies. Thus, the only non-vitreous material exposed to the action of the fluid being handled is the inner portion of the packing l1. While various glasses are particularly resistant to attack by acids and by alkalis, all glasses, even those commonly referred to as heat resistant," have only a rather 65. .of the impeller.
or volute portion II. In the form of pump casing selected for illustration, the sections II and II are made of refractory vitreous'material such as glass, for accommodating the pumping of highly corrosive fluids, and thecasing sections are secured together in a suitably clamped relation, as hereinafter described.
limited ability to withstand differential heating and-the resultant differential expansion stresses within the glass. This inherent weakness of glass has consistently thwarted all attempts to produce a satisfactory seal for an all glass pump inasmuch as the friction of a packing sufliciently tight to establish a fluid tight seal has generated suilicient heat in the adjacent portions of the glass parts to destroy them.
In the present invention the above difliculties and weaknesses have been overcome by increasing the area of the packing II in contact-with shank II ,and by providing on the back or adja- 'cent face of the impeller I a series of pump vanes V similar to, but somewhat smaller than the main pump vanes V' on the front or working face It has been found that if vanes are provided on only one side of the impeller "disc, fluid at thepressure developed at the periphery of the impeller will flow down its other I'face. Thus, if no means is provided to diminish this pressure the packing about the pump shaft must withstand and seal the maximum pressure developed by themump. On the other hand it is desirable that a certain amountof the fluid being pumped penetrates into the packing to lubricate the samesince otherwise some foreign lubricant must be provided which may dilute or contaminate the material being pumped. In the present structure the size and contours of the secondary vanes V are so chosen with respect to the working vanes V and the length of the packing il as to prevent any excessive pressure on the packing while permitting such seepage as is absolutely.
required. While it is feasible to couple metal to metal having suitable elastic limitsby the-commonly screws. Even though it were feasible to do this,
the torsional stresses and strains in set screw and keyway couplings would be localizedto the spot 4 of the set screw,'or the line of the keyway, which it is desirable to avoid. 2
Thus, a further problem which arises from the use of glass, pottery, and similar vitreous materials which are relatively weak in tension is that of suitably connecting the frangible impeller I to a metal drive shaft 0, driven by a prime mover, such as the electric motor M. It will be seen that the joint of the present invention must not only provide a supporting connection between the drive and driven members, but it must also be the instrumentality by which rotary motion is transmitted to the driven member, whereby the driven member performs work.
In order to connect the driven member, such as the impeller'I, to'the driving member, it is desirable to provide the impeller with some character of opening or cavity in which the driving member may be seated, or through which the drivingmember may extend. Since it is undesirable to permit any part of the prime mover connections tov pass through the impeller where they would come in contact with the fluid being pumped, .it is preferred to adopt the cavity principle, and in the preferred form of the invention a longitudinally fluted socket is molded in the impeller hub ll (Fig. 2). The flutes provide the crests 2i and the intervening valleys or troughs 22. The crests 2i serve as key-like protuberances, and the valleys 22 serve in the nature of keyways so as to conform to the corresponding configurations on the driving member. The side walls It of the crests ii are preferably parallel to each other and to the radius passing through the center of the crest, as shown in Flgsd, 4G, and 5 for purposes to be hereinafter explained. Across the crests of each of the flutes are axially spaced circumferentialiy extending grooves 28, connected across the valleys 22 by shallow 3 generally known as a quill. which is made preferably of acid resisting metal.
. The quill performs the function of distributing the stresses andstrains between the hub and the shaft C over agreater area than is possible with known impeller couplings, and it accordingly functions "as a torque distributing member, as well as a driving member.
The quill is an elongated'body and has an enlarged cylindrical head 25 and a reduced extension, indicated generally at 26,- terminating in a flattened transverse tang 21. A radially disposed cavity 28 in the inner wall of the socket 20 receives the tang when it is brought into registration, and cooperates therewith to form a mechanical driving connection "between thequill and socket. There will be suflicient clearance between the tang and cavity to accommodate a layer of cementing or bonding material. The
head and reduced part are separated by a radial shoulder that has a semi-circular radiallyextending groove 30 in its face. The groove 30 forms a vent or riser for excess cementing or .bonding material when the quill is inserted in the socket 20, thus allowing the shoulder 28 to be brought up against the free edge of the hub it and giving better positioning of the quill in assembling with the impeller, and also providing an index that the cavity between the ,quill'and the hub socket 20 has been completely fllled with bonding material during the assembly operation.
- There is a slight overall taper from the outer to the inner end oi the socket 20 in the hub and the reducedpart 2 6 of the quill is correspondingly tapered.
The reduced part 26 is formed with flutes slightly smaller than the flutes in the socket so that the crests 3i and the valleys or troughs 32 radial direction, and vice versa, with the bond grooves 24. The grooves 28 form a series of. spaced rings substantially interrupted by the valleys22 in the wall of the socket 28.
While the hub It may be secured directly to the drive shaft C, in the manner explained'in the present invention, it has been found to be more practical to'interpose an. intermediate connection, and .toward this end, there is used as the driving member 1), a hollow spindle or thimble on the reduced part 26 will leave a clearance with the corresponding crests 2i and valleys 22 in the socket!!! so as to permit a certain amount of the bonding material 33' to congeal between the confronting surfaces and resiliently lock the hub, and driving or torque distributing member D together. The side walls ll of the crests 3i are likewise parallel to each other and to the radius passing through thecenter of the crest It will be seen that when the quill is assembled in the hub, the crests of the flutes on .the hub overlap or overhang the flutes on the quill in a- 33" in between, and this prevents rotary play between the parts. I
At the outer end, each of the valleys 32 terminates in an outwardly flared pocket 33. The pocket 38 allows clearance. for the ends of the crests 2i 0! the flutes in the socket should any flns be adhering to them due to faulty casting, molding-or grinding. The riser groove 30 registers with one of the pockets 33. Extending across the crests 3! are a plurality ofclrcumferentially extending axially spaced grooves 85, and these grooves cooperate with the grooves 23 in the crests 2i of the flutes in the hub socket 2|! when the quill is assembled in the hub. Like the grooves 23 in the socket 20 of the hub, the
grooves 34 form a series of spaced rings interrupted by-the intervening valleys 32. These grooves Hand 34 prevent longitudinal movement between the quill and impeller, while the radially overhanging flutes on the quill and. hub
prevent rotary movement, when the terial is applied. I
Along the axis of the quill is a-socket 35 which receives the stub drive shaft C of the prime bonding maquill, and a second set screw 42 threaded in an opening 43 in the head 25. The positioning set screw 39! engages with an opening (Fig. 1) in the stub drive shaft C, and when seated in this opening the impeller will,be locked in its proper position on the shaft. The inner end of the set screw 42 abuts the periphery of the drive shaft C and takes up all play in the parts where-' by any tendency of the impeller to wobble is eliminated.
The quill is anchored to th impeller I by a bonding material 33a. Preferably there is used an alloy, cement, or bonding material having the characteristic of becoming liquid or thermoplastic under heat at a temperature that will not injure the glass when the bonding mate-' rial is applied, although hydraulic cements may also be used. Among the desirable bonding maerally designated as type metals which have the desirable property of expanding slightly while cooling from a liquid to a solid phase. This property is valuable in the present invention because the irregularity in the surfaces have been specially designed to accommodate such an expanding material.
The preferred way of joining the metal quill to the hub I8 is to heat the-quill and impeller to a temperature approximately that of the melting point of the particular composition used. A quantity of the composition slightly in excess of that required is placed in the socket 20 and the hot quill is inserted until shoulder 29 comes up hard against the end of the huh I. The excess material will meanwhile escape through the vent, or riser 30. When the quill is in its inserted position, the crests 2| of the flutes on the socket willsubstantially register with the corresponding recesses or valleys 32 in the flutes of the quill. In a like manner, the valleys 22 in the socket'20 receive the crests SI of the .flutes on the reduced part 26. In this position, the extremity of the crests on the flutes on the quill or driving member D, radially overhang, or overlap the extremity of the crests of the flutes in the socket 20 of the impeller or driven member I.
As heretofore pointed out, there will be continuous spaces between the corresponding crests and valleys in the socket 20' of the impeller and reduced part 28 of the metal quill in the assembled relation, and the shoulder 29 will be bearing against the free edge of the hub I8. The alloy bonding composition will then flll the space between the corresponding crests'and valleys of socket 20 and reduced part 26; and also fill the grooves 34 in the crests 3| of the flutes of the quill, and the grooves 23 in the crests 2| of the flutes in the socket.
While the tendency of the preferred alloys is to expand slightly on congealing. all such alloys and cements will shrink upon further cooling and, if the rate of shrinkage be different from the adjacent glass and metal parts, there will be a slight loosening of the joint. Such loosening is overcome inthe preferred form of the invention by the special design of the side walls of the crests 2| and 3|, as previously described. The shrinkage of the bond 33" which loosens the joint is primarily in a generally ra-.
dial direction. Due to the above described configuration of the crests, it will be seen (Fig. 4a) that any contraction of the bond 33a radially with respect to the quill 26 and hub l8 will result in an increased clamping action of the solidified bond against the walls 2| and 3| of I the various crests. In this manner a tight joint terials are those low melting point alloys genis ensured regardless of the rate of contraction of the bond.
It is pointed out there is an axial and cirlcumferential bond 33a of bonding material throughout the entire confronting area between the socket in the hub and the reduced part of the quill.
It will be understood that the bond is not an adhesive bond between the metal of the quill 26 and the glass of the hub l8. The composition will be adhesive or "wet only to the metal of the quill, and not to the glass. Because of-the different rate of expansion and contraction between metal and glass, it is not practical to have a bond which is adhesive to both materials. However, the composition when "set" forms a slightly yieldable cushion sufliciently conformed to produce a good mechanical bond, but yieldable sufllciently to distribute torque. In other words, the composition forms a load distributing coupling effective to maintain shear stress in theglass well below'its rupture value.
As a matter of fact, it is not essential to attain ing material which is not adhesive to the quill is used, then it is desirable to use a materialhaving a coeflicient of expansion greater numerically than the coefficient of expansion of the material of the quill, so that the bonding material will shrink tight about the quill on cooling.
As afurther variation, if a material is used which provides good adhesion to the quill, then it is not even necessary to form grooves in the quill.
,Inaddition to this bond, there is the mechanical lock against rotation between the parts, caused by the radial overhang between the flutes. This mechanical lock is augmented by the expantion of the tang 21 into the socket or keyway 28. From the foregoing it will be obvious that the driving stresses, when the parts are rotating are well distributed throughout the quill.
Thenthere is the still further mechanical lock against axial, or longitudinal movement between the parts occasioned by the circumferentialgrooves 23 and 24. These three factors distribute of example of suitable alloys for use as bonding materials:
Another and important problem involved in the construction of pumps, utilizingglass or other ceramic or vitreous materials is found in event that breakage should occur.
- To this end there is provided a sectional metal a housing or frame which furnishes a protective 1o being suitably assembled thereon, and then. the pump casing may be completedby placement of 'aaeaus I 5 the assemblage, mounting and adequate support for the pump casing within which is formed the pumping chamber. It is, of course, essential that the pump casing be held firmly and securely,
while at the same time avoiding any tendency to produce localized strain therein, and also to afford-protection from flying fragments, in the guard, as well as adequate support, this sectional housing being suitably clamped under predetermined uniform pressure.
In Fig. 1, the sectional metal housing or frame A provides a support for clamping the sections of the pump casing B together, and also provides the protective guard for the casing. All of the outer metal parts of the present structure, including the housing A-may be made of cast iron, or other metal, not necessarily highly resistant to acid or acid vapors, and such metal parts may be plated with acid resisting material, such as cadmium, or covered with rubber base paints, or other suitable acid resistant coating. This housing A is preferably formed in two 1 major portions or sections, the inner of which consists of a frame section 50 which may be suitably braced or bolted if desired, to the motor M. One convenient and conventional mode of supporting the frame 50 would be by a spideror 3 struts between the housing A and the motor, as illustrated for example in Fig. 9, but any. con-' venient method may be used. The outer section of the housing A comprises an annular flanged member 5| having aflange 52 directed radially inward to embrace a face of the casing section Ill, a projecting flange 53 disposed substantially at right angles to the flange 52 to encompass the periphery of the glass section I, and an out- 'wardly directed flange portion 54 which pro- 40 vides means for securing the section ii to the section 50. The section or portion isgenerally bell shaped to accommodate and encompass the glass casing section if -and terminates in its outer peripheral edge with a thickened flangelike section 55, rabbeted, as indicated at 56, to receive the flange. 53 of section 5!, and thereby provide a mating relation between the two housing or main sections 50 and 5|. The flange 54 is suitably drilled to receive threaded bolts 51 which may be threaded into the flange 55 of section 50.
It will be evident then that the pump casing.
' section II may be mounted within the bellshaped housing or frame section 50, the impeller the section casing Ill and securing thereof in place by the housing or frame section 5|.
In order to avoid a metal to glass contact and insure distributed loading, corner strips 58-58 of resilient material are inserted circumferentially about the corners of the respective sections In and H of the pump casing, and the frame but in order to facilitate such assemblage and to provide for adjustments of pressure against the gland, and to facilitatetake-up occasioned by'wear, temperature, or other conditlon 50, is formed open, and adjustable means are provided for effecting a closure thereof. To
this end an annular ring-like plate 59 is provided with a central opening 60 of a size large enough to surround the hub of the impeller and the drive shaft therefor with ample clearance. pose of this plate 59 is not only toclose the openingof the section 50 but also to apply a yieldable pressure against the elements of the gland, and
it will be observed that the sealing elements I! are backed up with .a follower 6i, preferably of glass, or of material having the same expansion and contraction characteristics as the material from which the pump casing and-impeller are made. the gland and backed up by packing of resilient material, indicated at '62, which in turn is backed up by the plate 59. Studs 63 threaded into the section 50 extend freely through perforations circumferentially disposed in the plate 59,.and carry at their outer ends take-up nuts. Interposed between the nuts 64 and the outer face of the plate 59 are springs 85. In the preferred embodiment of the invention, studs 63 are threaded for only a short distance at either end and. the length and strength of the springs 65 are so chosen that they will never befully compressed when nuts 84 are drawn up to their extreme limit of travel. Thus the pressure exerted on the follower 6i and packing II by ring plate 59 can never exceed a predetermined maximum pressure established by the characteristics of springs 65.
It might be noted that the elements mm ad-,
dition to functioning as a seal in a stufling box or gland, may be formed of material eifectiveto dispose of frictional heat and transfer same from the point of heat development. A suitable packing for this purpose may be prepared from asbestos fibres, lead shavings, and graphite,
From the foregoing it is evident that a controlled and predetermined pressure is exerted on the stuffing gland and transmitted through the stuffing box assembly, through the compression' afforded by the springs 65. I
Referring now to Figs. 6 and ,7, it will be observed that the essential elements-therein are substantially the same as illustrated in Figs..1
to 5. However, the supporting housing or frame A for the casing B, instead of being bolted or otherwise secured to the motor M, is provided with a standard 66 having a substantial base 61 and arranged to encircle the neck or hub-like portion 68 of the, housing A. Provision is made in the form of a threaded opening 69 for a set screw effective'to secure the standard tothe housing. Incidentally in Fig. 6 the discharge or outlet from the pump casing is illustrated at 10, and this same type of outlet or discharge may be used in several forms of the invention. The standard 88 may be formed with legs ll and the upper portion of the standard made separable from the base and leg portions to facilitate assemblage. In this event bolts 12 entering the socket portions I3 may be utilized to secure the standard in position.- This, however, is optional as obviously-the standardmay be made an intesral structure.
It has been stated heretofore that variations are possible in the joint and bonding media between'the drive shaft and hub of the pump impeller. Fig. 7 illustrates one such variation in which the hub. l8 of the impeller I is provided with circumferential inner grooves 21. of sub-. stantially uniform depth throughout, such depth The purtions, the rear of the housing A, i. e., the sec- 'being equivalent to that of the longitudinallyex tending grooves or flutes 32'. In this arrangement it is. contemplated that connection may be made directly to a drive shaft (not shown), or to a quill, but the tang 2'! (Fig. 21) may be omitted in the form shown in Fig. 7.
Figs. 8, 9 and 10 illustrate a somewhat further modification or embodiment of the invention, in
which the volute l5 and the closure plate 16 are arranged somewhat the reverse of the showings in Figs. 1 and 7, and in which the mode of clamping the frame sections and casing members I5 and I8 is difierent. In this embodiment, we find the volute. 15'on the forward or outer portion of the pump casing, extending outwardly into an eye or inlet 11, and forming a pump chamber, when assembled for the impeller I. A discharge I8 extends radially outward instead of tangentially, but this arrangement of inlet and out-' let can be varied to suit a particular installaradially extending flange-I9, and the section 76 has a similar flange 80 which merges into a shoulder 8|. When assembled the flanges l9 and 80 will be abutted, and the shoulder ill will fit within the periphery of the bell of the volute 15. While no gasket is illustrated between the flanges 19 and 80 (Fig. 10), it will be evident that any suitable packing or gasket may be utilized, asdesired, and thebase of the flange 80 is channeled, as indicated at 82, for the reception of packing at that point.
The frame or housing for supporting the pumpcasing takes the form of an annular member 83 secured to struts 84 which extend rearwardly to the motor M and form a support for the pump assemblage. Metal clamping pads 85 which may take the form of a complete annular ring, but
as illustrated are spaced pads, are arranged for placement exteriorly of the flange 19 and volute I5, as outer supporting or retaining meansfor the assembled sections and 16.
In order to secure the parts in assembled relat-ion, ears 86 are formed on the annular section "of the frame, these ears, together with pintles pressure applying medium to the stufling box. As shown in Fig. 9, the plate 5; is entirely supported by bolts 83', circumferentially disposed in suitable openings adjacent the periphery of the plate 59*, being in turn mounted in lugs 94 which are formed on the respective struts 84, instead of being secured into the frame or housing proper. Pressure adjusting nuts 64" control the pressure applied to springs 65 in a manner similar to that illustrated in earlier figures of the drawings. The other features of the pump structure and of the Joint are in all respects similar to those heretofore described in connection with other figures.
Having thus full described the invention, what we claim as new and desire to secure by Letters Patent of the United States is:
1. In a centrifugal pump of the type adapted to handle corrosive fluids, and wherein elements of said pump are subjected to a wide range of created temperatures, the combination of a rotat able glass impeller, a drive shaft for the glass impeller, a quill interposed between the impeller and the drive shaft, effective to distribute torque over a large area to the impeller, with mechanical means for connecting the quill to the drive shaft, and a firm connection including a mechanical interlock and a bond of plastic material distributed therein, between the impeller and the quill, effective to accommodate differential expansion between the impeller and its driving means.
2. In a centrifugal pump of the type adapted to handle corrosive fluids, and wherein elements of said pump are subjected to a wide range of created temperatures, the combination of a glass impeller provided with a glass-hub, a drive shaft for the impeller, with torque distributing. means bonded to the hub and mechanically connected with the 'drive shaft for driving the impeller, the bond between the torque distributing means and the hub including a mechanical interlock and a bond of plastic material distributed therein, said plastic material having the characteristic of accommodating differential expansion between the torque distributing means and the hub.
3. The combination with a rotatable, vitreous pumping member, of a non-vitreous drive shaft,
- torque distributing means interposed between said shaft and said member, and solidified plastic material interposed between said torque distributing means and said member providing a firm,
87, forming hinges for clamps 88. The clamps" 8| are provided with pressure adjusting screws 89 threaded into lugs 90 and eifective, after assemblage of the parts as an adjusting means for holding the pump casing sections in proper relation under desired pressure. Gaskets SI and 92 function in a manner similar to thegaskets 68-58 of Fig. 1 to resiliently protect the glass provide a means for mounting the face plate or resilient bond between said distributing means and said member, said torque distributing means and said vitreous pumping member having cooperating, inter-related portions bonded to each other in a mechanical interlock by said solidified plastic material.
4. A joint comprising a rotatable, metallic drive member, a rotatable, frangible driven member providing a socket for said drive member, said ve member having a portion disposed in said s ket, said parts being so shaped and proportio ed as to provide cooperating, inter-related parts ormingclearance's between the exterior of said ive member and the interior of said driven member when in assembled relation, anda plastic bond solidified within the clearance between the interior walls of the driven member and that portion of the drive member which projectsthereinto, providing, when set, a firm, resilient bonded, mechanical connection between the drive and drivenmembers.
Y I; members, and effective to provide a cushion coupling therebetween.
10. A rotary joint comprising a rotatable drive member, a frangible driven member, a
laterally projecting frangible hub on one .side of the driven member provided with a socket extending axially'of said driven member, a portion of the drive member being disposed in said socket in spaced relation to the walls thereof, a cushioning bond of thermo-plastic material in the space between said portion and said socket .walls formed of a material that has the property relation, and a firm bond of cushioning material within the clearances between the interior walls of the driven member and that portion of .the drive member which extends thereinto.
6. A joint comprising a rotatable, metallic drive member, a rotatable, frangible driven member having a hollow portion for reception of said drive member, said drive member being at least partially disposed in said hollow portion, means including relatively staggered longitudinally extending recesses on said drive'and driven members and circumferential relatively aligned recesses on said drive and driven members, the crests between recesses on one of said members being of smaller dimension than corresponding recesses on the' other member, to provide clearances between the exterior of said drive member and the interior of said driven member when in assembled relation, and a firm bond of cushion.- ing material within the clearances between the interior walls of the driven member and that portion of the drive member which extends thereinto.
7. A joint comprising a rotatable, metallic drive member, a rotatable, frangible driven member providing a socket for said drive member, said drive member having a portion disposed in said socket, means providing clearances between the exterior of said drive member and the interior of said driven member when in assembled relation, thebottom of said socket being slotted to provide a key-way, and the end of said drive member being formed with a tang of expanding while cooling from plastic condition to congealed condition, the internal walls of said socket being equipped with flutes providing crests andvalleys to provide a mechanical lock in addition to the bond to eliminate relative rotation between the drive and driven members, and the crests of the flutes having circumferential grooves effecting a mechanical lock with thelbond to eliminate axial movement between the members. I
11. A rotary joint comprising a rotatable inetallic drive member, a rotatableglassdriven on the respective members being provided with.
adapted to mate with said key-way, and a firm bond of cushioning material within the clearances between the interior walls of the driven member and that portion of the drive memberwhich projects thereinto.
8. A joint comprising a rotatable metallic drive member, a rotatable frangible driven member comprising head and hub portions, a socket in said hub portion for said drive member, said drive member having a portion disposed in-said socket, means providing clearances between the exterior of said drive member and the'interior of said driven member when in assembled relation, the bottom of said socket being slotted to provide a'key-way extending into the plane of said head portion, and the end of said drive member being formed with a tang adapted to .mate with said key-way, and a firm bond of cushioning material within the clearances between the interior walls of the driven member and all portions of that portion of the drive member which projects thereinto. i
9. A rotatable joint comprising mechanical 1y interengaging members, one arranged to be driven by theother, andone-of saidmembers being formed of frangible material, and a load distributing bond between said members disposed in and about the inte portions of said movement by the radial overhang of the respective crests on the members, the crests of the flutes circumferential grooves aligning with one another to efiect a mechanical lock against axial movement by the members, when filled with .a bonding medium, and a bonding medium consisting of plastic materialcongealed in the-space between the 'co-related'flutes and grooves, on the members to provide a firm resilient bond between the members in addition to the mechanical lock between the-crests and valleys.
12. In a pump of the type adapted to handle corrosive fluids, and wherein elements of said pump are subjected to a wide-range of created temperatures, the combination of a joint comprising a-drive member, a driven frangible pumpa ing memb'er provided with a socket, a portion of said drive member positioned in said socket, and a combined mechanical and cushioning, load distributing bond between said members effective to couple them-together, said load distributing bond including mechanically inter-related ele-:
ments on the drive member and in the socket, and a plastic material disposed in and about said elements.
13. A joint comprising a rotatable, metallic drive member, a rotatable, glass, driven member provided with a laterally projecting hub'to receive said drive member, means providing clearances between the exterior of the drive; member and the interior of the'hub when in a'ssembled relation and acushioning bond of thermoplastic material in the clearances between the drive member and the interior of the hub, said material having the property of expanding while solidifying, whereby it is expanded into said clearances.
HAROLD E. ADAMS.
WILLARD A. KAZIES,