US 2167690 A
Description (OCR text may contain errors)
Aug. 1, 1939. N. s. sERlNls u DISPLACEDENT DIPPER PUMP Filed June 8, 1958 Patented Aug. l, 1939 UNITE-D s'rlrr'r:
nIsrLAcEMEN'r nlPrEa PUMP Nee s. serum, Gloucester, N. J., assigner to New Process Rayon, lne., Gloucester, N. J., a corporation of Delaware y application .im s, 193s, serial Ns. euses The pr'ent invention relates to a pump for feeding liquids such as chemicals or solutions thereof or the like at asmall but practically uniform rate to a location at which such solu- 5 tion or liquid is to.be utilised. and to an apparatus including auch device.
More specifically it relates to a means for feeding liquids, particularlycorrosive liquids or such-asl might harden, crystalline, or otherwise 10 produce obstructions in small conduits or orifices.
The device embodies one or more pumps each having la displacement member, a reservoir for the liquid to be fed and a reciprocating dipper l5 for feeding the liquid to `be pumped, together with a suitable outlet for the liquid.
'I'he invention also embodies two pumps geared together so as to operate alternately. This arrangement Vts advantageous in that it will give o a more continuous flow from the pumps than would a single pump, since the two pumps will produce ailow wherein the fluctuations are considerably less than in a single pump.
"me twopumps may also be used to feed two g5 different liquids while maintaining' strict proportionality between the outputs of the respective pumps or maintaining strict equality where such equality isnecessary. This ratio may b e adjusted very readily by' means of the two displaceso ment members land in this way the combination of two pumps niay play a very important part wherever it is necessary to supply such two different solutions or chemicalLat a constant ratio to one another. :i5` The appartus is of general application in the art'of feeding liquids, particularlyfwhere 'small flows of corrosivev liquids are involved.
In the specific instance illustrated in the present case it is shown as applied to an acid drip 40 device yfor rayon or other .artificial liber.
l .Por a clear understanding of the invention reference is to be 'had 'to the accompanyingdraw- Figure 1 illustrates apair of pumps and asso' elated parte. view.' seing s diagrammatic through such multiple pump struc turegjand Zisaperspectiveviewofaportion of the structure shown in Figure 1. parts beins omitted andcthel Parts being shown in section for clearnessof illustration. j In the dllmrillnll'A eachinimn.. I represents a container, made of. any suitable material, for
,n example metal, 'for.holding theaeid mother drip or flow, by gravity.
s calm. (01.22141) chemical or liquid which is to be applied to the In order to pump or feed the acid or liquid 2 from said container I, use is madey of afdipper I here shown as a vesselhaving advantageously g a convex lower end and which is made small enough to be submerged bodily within the liquidl 'in the container l. The dipper has'a discharge lip `as rshown at 4 from which liquid may l0 'Ihe dipper is supported in a holder here shown as a tubular member lwhich is connected with an operating member l. Means are provided for u reciprocating the dippers. these means comprising a shaft 4l which isgiven oscillating motion il from any desired source, not illustrated, and which carries a pinion 4I meshed with two vertically arranged rack bars I6 and Il respectively. The rack bar "is'secured to a strap u which is capable of reciprocating movement in the slot 20 'l0 of end plate 3l while the rack bar l1 is correspondingly secured to the strap Il which similarly reciprocates vertically in the slot Il also formed in said end plate.
Upon referring to Figure 2, it will be seen that u the collar i whichencircles the dipper l has wings l2 thereon which may be clamped together by means of a screw Il so as to hold the dipper firmly to the part 1.
The elements Il which support the collars l so holding the displacement members l may be se-` cured to the longitudinal membersV Il and 4U of the frame in any suitable manner as by the spot welds 4| `indicated in Figure l.
For smoothness of operation the shaft Il may ss be extended to the opposite end of the frame and duplicate racks and 41 secured to the opposite endsI ofthe straps M' and respectively may be provided to cooperate with a duplicate pinion 4l secured to theV other endl of the shaft 40 4l so thatA both pinions will operate in unison. and will reciprocate the straps Il and Il in unison at their opposite ends so as to prevent any possibility of binding. o
The end plates," together with the longitu-. dlnal I! and 4I which are'secured thereto'form a supporting 4frame for thetwo pumpsand this frame in turn stands on a pair of supports Il. one vat each end, only one, however. being shown here.
1 The reciprocating member-srl are secured Hto the v elements M and 4l in any desired way, for
example by spot welding as indicated at l2.
Cooperating with the dipper l there is aplunger or displacement member lwhich may be sup-.55
ported by any suitable clampor the like here shown as a cylindrical clamp l which releasably grasps the member 8 to permit vertical adjustment of the displacement member l if desired. Each cylindrical clamp may be split as shown and terminate in the 'wings l5 which may be drawn together by means of the clamping screw and nut 36 as best shown in Figure 1, to permit such releasable clamping oi' the member l. Attached to each container I there are supporta II, II with clamping screws I2, I2 which will engage the stem I3 of a vessel Il and hold said vessel in proper position so that its funnel-top I4 will come below the downwardly bent end 28 of a pouring spout III which is also secured to the vessel I. This spout may conveniently rest upon and be secured to one of the flanges 24, 25 formed at the top of the container I.
The vessel 3| also has at its lower end a body or bulb I5 with an outlet opening I4 into which fits loosely the upper bent end of a rod Il which serves to conduct liquid from said bulb downward by capillary action as disclosed in greater detail in copending case Serial No. 212.524, filed of even date herewith.
In operation, upon reciprocation of the operating member 'I the dipper 3 will be depressed below the surface of the acid or other liquid 2 in the container I so that the dipper will become filled with such liquid, this operation occurring upon each downward stroke o! the respective dipper.
Thereupon, when member I raises the dipper, the latter will first discharge the excess of its contents above the level of its discharge lip 4, which will have taken place before the dipper has risen far enough to bring the liquid therein into contact with the lower en d 28 of the plunger 8. This lower end may conveniently be made convex as illustrated so as to make it easy to keep clean, although its exact shape is not an important feature of the present invention.
Upon further ascent of the dipper the plunger B will begin to become immersed in the liquid contents of said dipper, in other words, it will begin to displace some of said contents which will thereupon discharge through the pouring spout 4. Immediately below this pouring spout and advantageously in vertical augment with its discharge edge, there is a drip member 28 forming part of the pouring spout III which will graze the lip 4 when the dipper ascends and strike oit any excess liquid therefrom. The plane of the drip member or baille 26 also serves as a defining plane in that any liquid flowing to the right of said wall will flow down the incline of the discharge spout I0 and through its downwardly bent discharge end 23 into the funnel I4. It is clear that the dipper 3 will cntinue to discharge some of its liquid contentsv 8 as long as it continues to rise, that is, as long as the plunger 8 continues to become immersed more deeply in the said liquid.
Because of the fact that the liquid flows with a certain horizontal velocity from the outlet spout 4, that is, it does not merely drip down therefrom, the flow of such liquid will overshoot the plane of the baille 24 and, therefore, it will ow down the inclined discharge spout Il instead of dripping back into the container I.
Upon the next movement of the member 'I the dipper will again become submerged in the contalner I and will take up a new charge of liquid, whereupon the action above dcribed will be repeated, and so on.
The liquid which flows into the funnel I4 will find its way down through the neck Il of the vessel II, into the bulb or body portion I 5 thereof and thence out through the orifice It and along the rod i8, as described in greater detail in the said copending case.
It is obvious that upon each vertical reciprocation of the dipper 3 the same amount of liquid will be discharged from its spout 4 into the pouring spout I0, this amount being equal to the volume of the submerged portion of the plunger 8. This affords a simple and convenient means for adjusting the rate of feed of liquid, for it is necessary merely to raise or lower the plunger 8 within its clamp 8 so as to vary such submerged volume.
A difficulty encountered in pumps or feed devices of the conventional types is that where the feeds are relatively small or where the liquids being fed are corrosive chemicalsl or solutions thereof vor such as may solidify or produce deposits of any kind, the small passages necessary in such pumps readily become clogged so as to obstruct the flow and eventually stop it altogether or become eaten away so as to increase their size and produce a gradually increasing flow, or else certain vital parts of the pump mechanism such as valves or the like may become corroded, and stuck or leaky as a result, and various other disad- 'vantages only too well known to those skilled in the art may occur therein.
The present device obviates all these disadvantages in the first place by providing a. pump which has no valves whatever, and which has no parts which fit closely on any others to produce a pumping effect such as a pressure or a suction, with the further incidental advantage that it is not necessary to do any accurate machiningl or fitting of parts whereby consequently friction also is eliminated entirely so that no wear takes place and no sticking can result. 'I'he parts of the present pump are all very simple and are readily accessible for cleaning and repair or replacement. Y,
A further advantage of the device is that all the parts are relatively simple in shape and structure and may be readily made with sufficient uniformity by ordinary manufacturing processes.
While the device has been herein described as intended mainly for the feeding of chemicals, and particularly of corrosive chemicals such as acid or alkaline solutions, cr such as might produce obstructions, it is, of course, also of general application and may serve also for the feeding of water or other harmless, neutral or non-clogging liquids with equal efficiency.
'It is possible that the pump comprising the displacement member and the dipper might be used to discharge its contents to some other mechanism than the vessel 3| and where such conditions exist, it will be evident that the pump may be used independently.
It will be noted that two pumps have been disclosed in the present case and that they are duplicates of one another as to all their essential working parts. However, it will beseen that the dipper or bucket of one of the pumps will be at the top of its stroke when the dipper of the other is at the bottom of its own stroke, that isl the two pumps are here geared so as to operate alternately. This arrangement may be advantageous in certain cases as it will give a more continuous flow from the pumps than would a single pump, since the two pumps will produce a flow wherein the fluctuations are considerably less than in a single pump.
Itis, of course, also possible that the two pumps may feed two different liquids while maintaining strict proportionality or maintaining strict equality where such is necessary. This may be adjusted very readily by means o! the two displacement members and in this way the combination of the two pumps may play a very important part wherever it is necessary to supply such two diiferent solutions or chemicals at proportional rates.
While a specific embodiment of the device has been disclosed herein, it is obvious that this embodiment merely represents one particular form of the invention, which is not limited thereby but is understood to be defined only by the following claims.
l. A feeding device for liquid, comprising a reservoir for the liquid, a dipper, means ior reciprocating the dipper to alternately submerge it and elevate it, a displacement member, and means for supporting it in cooperative relation to the dipper, to cause it to displace liquid therefrom.
2. A feeding device for liquid, comprising a reservoir for the liquid, a dipper, means for reciprocating the dipper to alternately submerge it and elevate it, a vertically adjustable displacement member,` and means for supporting it in cooperative relation to the dipper, to cause it to displace liquid therefrom.
3.Inadeviceasinclaim l, apouring spouton the dipper to conduct its discharge to a location beyond the connnes of the reservoir.
4. A proportional feeding device for two liquids comprising a pair of feeding devices each comprising a reservoir for the liquid, and a dipper, means for reciprocating the dippers in opposite phase to one another to alternately submerge and elevate them, a pair of vertically adjustable displacement members and means for supporting them in cooperative relation to the corresponding dippers to cause them to displace liquid therefrom.
5. A proportional feeding device as defined in claim 4, wherein the means for reciprocating the dippers comprises a rack attached to each dipper and a single pinion in mesh with both racks.
6. A feeding device for liquid comprising a reservoir for the liquid, a dipper, means for reciprocating one with respect to the other vertically to alternately submerge the dipper and remove it from the liquid, a displacement member.
-and means for supporting it in cooperative relation to the dipper to cause it to displa liquid therefrom upon relative movement between thev dipper and displacement member.