US3818924A - Fluid metering device - Google Patents

Fluid metering device Download PDF

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US3818924A
US3818924A US00294984A US29498472A US3818924A US 3818924 A US3818924 A US 3818924A US 00294984 A US00294984 A US 00294984A US 29498472 A US29498472 A US 29498472A US 3818924 A US3818924 A US 3818924A
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fluid
pumping means
inlet
outlet
passage
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L Carlyle
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D11/00—Control of flow ratio
    • G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
    • G05D11/035—Controlling ratio of two or more flows of fluid or fluent material with auxiliary non-electric power
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M7/00—Special adaptations or arrangements of liquid-spraying apparatus for purposes covered by this subclass
    • A01M7/0089—Regulating or controlling systems
    • A01M7/0092—Adding active material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2514—Self-proportioning flow systems
    • Y10T137/2516—Interconnected flow displacement elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2514—Self-proportioning flow systems
    • Y10T137/2541—With measuring type discharge assistant

Definitions

  • a fluid metering device mixes a predetermined quantity of a first fluid with a larger quantity of second [22] plied 1972 fluid supplied to the device at a higher pressure on [21] Appl. No.: 294,984 each cycle.
  • the pressure of the second fluid provides the force necessary to motivate a first pumping means which on movement to an outlet position within a [30]
  • Fqrelgn Application Pnomy Data housing displaces the mixed fluids on an outlet side of New Zealand 165087 the first pumping means to their destination.
  • Move- 7 ment of the first pumping means actuates a second [52] U.S. Cl 137/99, 137/101.31, 222/57 pumping means which pumps a predetermined quan [51] Int. Cl.
  • One particular application of this invention is to inject a bloat control chemical into the drinking water fed to cow troughs to control bloat in cows.
  • cows drink 12 22 gallons of water per day.
  • cows are habit forming creatures, a cow which has bloat in wet weather will from past experience know that drinking water helps relieve the discomfort. It is, of course,
  • the quantity of bloat control fluid injected into the water supply varies with the rate of flow of water through the device.
  • the concentration of bloat control fluid in the water is lower than on a wet day when a lesser amount 7 of water will be consumed.
  • a cow which will naturally drink a lesser amount of water on a wet day will still get the requisite amount of chemical needed to control any bloat condition.
  • the present invention consists in a fluid metering device comprising;
  • a housing with a hollow interior b. first and second fluid inlets into said hollow interior for first and second fluids respectively c. a fluid outlet from said hollow interior (I. first pumping means within said hollow interior and displaceable under fluid pressure between said secondfluid inlet and said fluid outlet from'an inlet position to an outlet position to cause mixed first and second fluids to be expelled through said fluid outlet e. biasing means tending to retain or restore said first pumping means at or to said inlet position in use f. a passage communicating between said second fluid inlet and said fluid outlet g.
  • closure means adapted to close said passage at said inlet position and also during displacement of said first pumping means, under fluid pressure, fromsaid inlet position to saidoutlet position and to open said passage at said outlet position and also during movement of said first pumping means from said outlet position to said inlet position and h.
  • second pumping means actuated on movement of said first pumping means to cause a predetermined quantity of said first fluid to enter said hollow interior through said first fluid inlet pumping means.
  • FIG. I shows a side elevation of one embodiment of the invention
  • FIG. 2 shows plan viewII 4 II
  • FIG. 3 shows plan'view III Illl
  • FIG. 4 shows a side elevation of first pumping means, closure means and part of second pumping means removed from the housing
  • FIG. 5 shows plan view V V
  • FIG. 6 shows plan view VI VI
  • FIG. 7 shows a side elevation of part of a closure means removed from the first pumping means
  • FIG. 8 shows a central longitudinal cross section through first fluid inlet means and part of second pumping means
  • FIG. 9 shows a crosssection IX- IX through part of second pumping means
  • FIG. 10 shows a cross section through a different embodiment of the invention
  • FIG. 11 shows a schematic partial cross section through a still further embodiment of the invention having some resemblances to that of FIG. I0,
  • FIG. 12 shows a cross section through a different embodiment of the second pumping means
  • FIG. 13 shows a cross section through yet another embodiment of the second pumping means
  • FIG. 14 shows a schematic perspective view of a further embodiment of first pumping means and closure means
  • FIG. 15 is a graph showing a typical variation of volume of water passing through the preferred device of FIG. 1 per cycle, at different flow rates,
  • FIG. 16 shows a graph of cycle duration of the device of FIG. I at different flow rates
  • FIG. 17 shows a further embodiment of the present invention and shows a cross section through the upper part of a housing, first pumping means and closure means
  • FIG. 18 shows a still further embodiment of the present invention and shows a cross section through the upper part of a housing, first pumping means and closure means
  • FIG. 19 shows yet another embodiment of the present invention and shows a cross section through the lower part of a housing, first pumping means, closure means and second pumping means, and
  • FIG. 20 shows the last embodiment of the present invention and shows a partial cross section through the lower part of a housing, first pumping means, closure means and second pumping means.
  • the fluid metering device comprises a housing 1 having a hollow interior.
  • the housing is provided by means of a 3 inches internal diameter clear perspex tube 2 provided with plastic end caps nowadays and 4 clamped on the tube by means of a wire frame 5 fitted with mounting brackets 6 and. clamping screw 7.
  • a sturdy frame is necessary to hold the end caps on to the tube 2 since there may be quite large internal forces on each cycle of said first acting against the end caps tending to blow them off the tube.
  • End cap t which is arranged to be lower than end cap 3 in use, since the tube 2 must be arranged to be vertical or near vertical, is provided with first and second fluid inlets 9 and through it and into the hollow interior of the housing 1. End cap 3 is provided with a fluid outlet 11.
  • First pumping means 12 are slidable within the hollow interior and separate the first and second fluid inlets 9 and 10 from the fluid outlet 11 Since the first pumping means which largely comprises a brass cylinder 13 is in sealing engagement with the internal walls of the housing 1 by means of a resilient sealing ring 14.
  • the weight of the first pumping means 12 provides biasing means tending to retain or restore the pumping means at or to an inlet position which is the lowermost position it can assume within the housing 1. For the weight to provide a biasing means it is necessary that the average density of the first pumping means exceed that of the fluid or mixed fluids which are to pass through the device; otherwise the pumping means would float and alternative biasing means would be needed.
  • the first pumping means 12 also has a passage 15 which communicates between the first and second fluid inlets 9 and 10 and the fluid outlet 11. However, the passage is adapted to be closed at the inlet position and also during displacement of the first pumping means 12 under the pressure of the second fluid (that entering via the second fluid inlet 10) when it travels up the tube 2 to an outlet position which is defined as being the position when the passage is first opened.
  • Closure means 19 are adapted to close the passage 15 at the inlet position and also during displacement of the first pumping means 12 from the inlet position to the outlet position and are adapted to open the passage at the outlet position and also during movement of the first pumping means from the outlet position to the inlet position. The forces causing such movements will be described later.
  • the closure means is provided with a closure member 20 in the form of a disc of brass surmounted by a heavy brass stem 21.
  • the closure member 20 is displaceable relative to the first pumping means 12 and in order to limit the displacement, stop means are provided by the diameter of the closure member disc 20 being larger than the diameter of passage 15 and by means of a cage '22 bolted onto the bottom'of the cylinder 13.
  • a circular neoprene sealirig ring 23, embedded in a groove in the cylinder 13, is provided between the closure member 20 and the cylinder 13 so that the passage 15 may be effectively sealed.
  • the closure member 20 In order that the closure means opens the passage when required, it is necessary in this embodiment for the closure member 20 to have a ratio of thrust surface (which is basically the area contained within the diameter of the sealing ring 23) presented to the second fluid inlet 10 at the inlet position to the biasing force (which in this case is weight) tending in use to retain or restore the closure member to the inlet position which exceeds the same ratio of the pumping means 12 (where the thrust surface is the internal area of the housing tube 2 minus the thrust area of closure member 20).
  • the weight of the closure means 19 is the total weight of the cylinder 13, the cage 22 and the associated plunger 24 of second pumping means 26, the operation of which will be described later on.
  • closure means 19 is more floatable than the first pumping means 12, i.e., it experiences a greater resultant up-thrust and thus tends to carry the first pumping means up the tube so that the seal is maintained until the outlet position isreached.
  • engagement means 25 are provided adapted to restrain or stop the movement of the closure member 20 as the first pumping means 12 approaches or attains the outlet position.
  • the engagement means 25 are provided by the stem 21 surmounted by spiral spring 29 which at the outlet position bears against the end cap 3.
  • a cycle commences with the first pumping means and closure means at the inlet position with the space in the tube 2 above these filled with fluid.
  • the fluid referred to as the second fluid is introduced under a suitably high pressure through the second fluid inlet 10.
  • the first pumping means 12 and closure means 19 form a slidable barrier across the interior of the tube 2 and are therefore acted upon by the fluid pressure and caused to rise displacing as they do so fluid through the fluid outlet 1 1 if the outlet pres sure is sufficiently lower than the second fluid pressure.
  • closure means 19 begins to sink and the closure member 20 would usually come to rest on the bottom of the cage 22 and the combination of first pumping means and closure means would descend down the tube to the inlet position.
  • legs 30 extending below the closure member disc 20 and through holes 27 in the cage hold the closure member at a suitable height so that it supports the weight of the first pumping means 12 at the inlet position.
  • the first pumping means 12 descends on the closure member disc 20 to close the passage, the cycle recommences.
  • the second pumping means 26 provided by the plunger 24 extending from the bottom of the cage 22 and the barrel 31 provided centrally within a hexagonal plug 32 threaded at 33.
  • the plug forms part of the first fluid inlet means 9 and is able to be screwed into the end cap 4.
  • the combination of plunger 24 and barrel 31 serve to define a chamber 34 interposed in the first fluid inlet and as will bedescribed, the volume of this chamber is caused to fluctuate by a predetermined amount on cycling of the first pumping means so that a predetermined quantity of the first" fluid to be ad mitted into the hollow interior through the first fluid inlet 9 is pumped in by the second pumping means once per cycle.
  • first and second one way valve means 35 and 39 are provided.
  • the first one way valve means 35 is preferably in the form of a flap valve with a circular neoprene disc 40 beingheld in the barrel 31 by means of a circlip or pin 37.
  • the second one way valve means 39 is provided in a bore 41 through plunger 24 and may comprise a flap valve substantially the same as the first one way valve means 35 or alternatively, and as shown, may comprise a phosphor bronze ball 42 held in place by pin or circlip
  • the arrangement of plunger and barrel is such that at the inlet position, the plunger extends into the barrel 31 a certain amount. When the pumping cycle commences from the inlet position, the plunger 24 rises with the cage 22 and cylinder 13.
  • a resilient seal 44 ensures that there is a suction created below the plunger in the barrel which causes the first one way means 35 to open (the second one way valve means 39 being shut) and draws the first fluid, usually from an open container attached by meansof a flexible tube to the nipples 45, into the chamber 34.
  • a point is eventually reached where the plunger 24 leaves the barrel 31 and at that juncture the first one way valve means 35 shuts.
  • the plunger 24 enters the barrel and the'second one way valve means 39 opens to relieve the pressure which would otherwise be created (since the first one way valve means 35 is shut). Any first fluid remaining in the barrel is expelled through the bore 41 of the plunger and thus into the hollow interior where it mixes with the second fluid.
  • the cylinder 13 is not constrained against rotation in the tube 2 and therefore the plunger 24 is provided concentric with the axis of the cylinder so that it will always mate with the barrel 31, which is provided centrally in "the end cap 4, when the cylinder 13 descends.
  • regulator means comprising the threads 33 and'mating threads in the end cap 4 are provided so that the relative position of the chamber along the direction of movement of the first pumping means 12 may be varied, i.e. the depth of entry of the plunger 24 into the barrel 31 is adjustable.
  • the overall length of the tube 2 which has an internal diameter of 3 inches, is 25% inches.
  • the weight in air of the cylinder 13 with cage 22 and plunger 24 is 6 lbs.
  • the weight of the clo sure means 19 is 2 lbs. Most of those'parts are constructed of solid brass.
  • the diameter of the circular seal 23 is 1.875 inchesso that the ratio. of up-thrust area of the closure means 19 when at the inlet position to weight is approximately twice that of the first pumping means. This ensures that the passage 15 is properly closed when the combination moves from the inlet to the outlet position. At high draw-off rates through the fluid outlet 11, the cycle time is fairly short, as shown in FIG. 16.
  • the first pumping means 12 is moving with a relatively high velocity when the closuremeans is restrained from further movement by contact with the end cap 3 and under these conditions the resilient spring 29 is not really necessary since the first pumping means has a relatively large amount of kinetic energy whenthe passage is opened and it moves an appreciable distance furtherup the tube 2 before this is wholly converted to potential energy and the velocity falls to zero.
  • the closure means 19 has probably descendedto rest on the cage 22.
  • the velocity of the first pumping means at the outlet position may be fairly slow so that there is only a short lag after the passage is opened before the cylinder 13 begins to de scend.
  • FIG. 14 shows one method useful where the fluid is relatively viscous.
  • the cylinder 49 with embedded circular sealing ring 50 is provided with a large number of small passages or tubules 51 as well as a central passage 52 of a diameter just sufficient to loosely receive a small diamater engagement means stem 53 fastened to a closure member disc 54 of a diameter slightly larger than that of the sealing ring 50.
  • the closure means in such acase suffers far less fluid frictional retardation when descending than does the cylinder 49 where the relatively small diameter passages 51 and 52 impede the rate of flow of fluid through it and thus slow its descent.
  • the mechanical friction of the resilient sealing ring 14 surrounding the cylinder 13 is quite high, which again retards the rate of descent of the first pumping means.
  • the forces acting on the first pumping means and the closure means are in each case its weight acting downwards, the Archimedes up-thrust acting upwards and the viscous resistance acting upwards.
  • the Archimedes'up-thrust equal to the weight of fluid displaced will in each case bear the same proportion to the total weight of the first pumping means or the closure means respectively.
  • typical flow rates may be -500 gallons per hour and typical water inlet pressures maybe 2-175 pounds per square inch.
  • gallons means Imperial or United Kingdom gallons.
  • the first fluid is simply located in a vessel open to atmospheric pressure and is sucked into the first fluid inlet through a 3/16 inch internal diameter plastic tube.
  • the hexagonal plug 32 is screwed in or out to achieve this. If the flow rate is only 50 gallons per hour, 25 ounces of bloat control fluid are injected per 100 gallons of water but at rates higher than 100 gallons per hour, a lesser amount than 15 ounces per 100 gallons is injected. This is because at higher flow rates a greater amount of water will pass through the passage on descent of the first pumping means during the relatively fixed time it takes to descend in water. This is because on the descent part of the cycle, the device presents an open valve between second fluid inlet and outlet. The effect is shown in FIG. 15. Thus while the volume of second fluid is variableper cycle, the volume of first fluid remains constant and thus the concentration rate alters with draw-off rate.
  • the weight of the first pumping means and closure means is such that with second inlet pressures within the above range, no difficulty is caused by jetting of the in FIG. 10. There, instead of relying on gravity to provide the biasing acceleration on the masses and thus a surmount the bridge 62 for the same purpose as the spiral compression spring 29 of FIG. 1.
  • the arrangement is such that at the inlet position, as illustrated, second fluid entering the second fluid inlet 64 is met with a situation where the closure member 61 is more floatable (against spring pressure) than the first pumping means 59 so that the passage 65 is closed until the outlet position is reached.' Then on opening of the passage and equalisation of the fluid pressure around the closure member 61 the initial displacement of the closure member 61 from the first pumping means 59 given by recoil of the elastic blocks 63 is maintained or in creased by means of the spring 60 as the first pumping means descends until the closure means, which includes (but is not limited to) the compression spring 60, closure member 61 and resilient block 63, seats on the bottom of the housing when spring 55 causes the first pumping means to continue moving until the passage is closed.
  • biasing force need not be provided by a spiral spring but could be provided by any resilient material.
  • elastic materials placed in tension and by means of suitable valving to construct an embodiment of this invention where the biasing means is provided by fluid pressure.
  • the second pumping means 69 (FIG. 10) is virtually identical to that described with reference to FIGS. 8 and 9 except that it may be noted that the bore 70 of the plunger 71 communicates on the outlet side of the first pumping means 59, not the inlet side. This illustrates that the position of the first fluid inlet is not of vital importance to this invention since adequate mixing will probably occur in most circumstances regardless of whether it is situated on the inlet or outlet side of the first pumping means. It should also be noted that although the plunger 71 probably would leave the barrel 66 in the embodiment illustrated in FIG. 10, this is by no means necessary.
  • the chamber could be provided by some flexible diaphragm, diaphragm pair or concertina like arrangement provided with the first and second one way valve means which would be equivalent to the form of second pumping means illustrated.
  • second pumping means which could be used in this invention and they need not be situated on the inlet side, nor need they be provided with one way valves since an arrangement of simple shut-off valves could be used to achieve a similar pumping effect.
  • FIG. 11 A further embodiment illustrated'in FIG. 11 has resemblances, as far as the first pumping-means 72 and closure means 76 are concerned, to FIG. 10.
  • the first pumping means 72 instead of being slidable within the housing 73, incorporates a flexible diaphragm 74 secured to the housing around its circumference.
  • the use of a diaphragm obviates the possibility of leaks between the first pumping means and the housing which may be very desirable in certain applications where considerable metering accuracy is necessary.
  • the closure member has been unattached to the first pumping means, it will be evident that the closure member could comprise a flap hinged to the first pumping means and such a device :would function in an obviously equivalent manner. Also, although in the embodiment described above the closure means has been more floatable than the first pumping means, it is not essential that that should be so.
  • the housing 79 has an end cap b including three downwardly depending engagement means 31 (only two of which are shown) equipped with spiral compression springs 82.
  • the first pumping means M in this embodiment comprises a cylindrical piston with a central passage 84 through it and an outer sealing ring M.
  • closure means $9 which comprises a closure member 99 in the form of a disc having a downwardly dependent plunger 91 forming part of second pumping means.
  • a resilient sealing ring 92 is contained in a groove in the first pumping means 83.
  • the arrangement is such that the thrust area of the closure means 89 presented to the second fluid-inlet (not shown), being that area contained within the diameter of the sealing ring 92, to the biasing means (which in this case is its weight) tending to retain or restore the closure means at or to the inlet position is less than that of the first pumping means 83 so that the first pumping means is relatively more floatable and on movement from the inlet position to the outlet position tends to carry the closure means 89 upwardly so that the passage is closed.
  • the outlet position it is .not the closure means 89 which is restrained from further movement but the first pumping means by means of the engagement means 81.
  • FIG. l7 has the disadvantage that mechanical friction forces atthe seal b could, in certain circumstances such as where grit might enter through the second fluid, slow down the rate of descent of the first pumping means so that the closure means 89 caught up to it and closed the passage 84 before the plunger 911 had fully re-entered its barrel. For this reason the diaphragm and spring equivalent may be preferred over the sliding piston type illustrated.
  • the reason why the second pumping means preferably forms part of the first pumping means is that if it were part of the closure means, there would be a danger that the descent of the closure means would be slowed up on re-entry of the plunger into the barrel and that a seal would be made closing the passage before the plunger had fully entered the barrel. This would mean that a cycle would commence in such circumstances with a lesser amount of first fluid being pumped into the housing.
  • engagement means although it has been described primarily as a stem extending up through the passage from the closure member, could equally well comprise a stem or similar protruding from the inside of the housing, such as FIG. 17 illustrates.
  • the closure member 93 is a flap pivotted at 94 within the hollow head region 95 above a tube 96.
  • These parts are situated within a housing 99 within which there is a piston lllllll comprising part of first pumping means and by means of seals Mil and W2 making sealing engagement with the cylindrical wall 193 of the housing and with the tube 96.
  • the closure member 9.9 is by means of gravity or the pressure of a light spring MM, or both, caused to cover a port 195 in the head.
  • On the upper surface of the piston wil there is a striker pin 11W forming part of engagement means.
  • the fluid outlet is indicated at llllll.
  • second fluid is able to flow through the tube 96 and out through the port 105 on its journey to the outlet llllll and the piston 100 sinks seeing that the pressure around it is equalised. Eventually it will restrict the flow of fluid through the port 109 so that the flow which previously held the closure member 93 open against the force of its weight and the pressure of spring MM is insufficient to hold the closure member open and the port 195 is sealed. Immediately the second fluid pressure causes the piston 190 to rise once more, thus commencing another cycle.
  • second pumping means of some form are actuated by cycling of the piston Mill to meter in the desired amount of first fluid.
  • the closure means does not cycle with the first pumping means.
  • the tube 96 can be C shaped 'so that the passage through it passes around and not through the piston tilt).
  • FIG. 19 an embodiment is shown which uses a still different approach.
  • pumping means 114 is not in continuous sealing engagement with the hous ing 115 but comprises a piston T19 which is loosely fitting within the housing, having depending from it a plunger forming part of second pumping means 12B.
  • the piston M9 is in sealing engagement with the housing 115 only via a resilient rubber somewhat cone shaped device 122 secured to the under surface of the piston.
  • a second fluid inlet is shown at 123 and the fluid outlet at 124. The inlet position is as illustrated.
  • the-second fluid causes the first pumping means 114 to rise in the housing until the outlet 11% is uncovered.
  • the second pumping means 121 is actuated as usual.
  • the natural resilience of the cone device 122 causes the outer circumference 125 to contract. This leaves a passage around the first pumping means through which the second fluid may flow as the first pumping means descends.
  • the cone strikes the end cap 126, however, it is spread outwardly by the weight of the piston 119 so that the circumference 125 re-establishes sealing contact with the housing 115. The cycle then commences once more.
  • the portions 127 of the coned device 122 can be omitted and the base end cap 126 can be pronouncedly coned upwardly to assist in the spreading and sealing operation when the device 122 descends on the end cap.
  • the sealing means 130 is in the form of a skirt formed with an inner groove to receive a loop tension spring 131 so that in its normal position the circumference 125' does not make sealing contact with the housing 115.
  • the first pumping means reaches the inlet position on descent the pronounced cone shape of end cap 126' assists spreading of the seating means 130 to form a seal against the housing 115' which is retained by the pressure of the second fluid on ascent of the first pumping means.
  • biasing means other than weight could be used, e.g., a compression spring and that the passage communicating between the second fluid inlet and the fluid outlet passes around the first pumping means.
  • a fluid metering device comprising;
  • a housing with a hollow interior b. first and second fluid inlets into said hollow interior for first and second fluids respectively 0. a fluid outlet from said hollow interior d.
  • a fluid metering device as claimed in claim 4 wherein said engagement means is elastic so that on the point of opening of said passage and equalisation of the fluid pressure on said closure member and said first pumping means, the recoil causes a sudden speed difference'to be imparted between said closure member and said first pumping means.
  • a fluid metering device as claimed in claim 7 wherein said chamber is defined by a barrel and a plunger movable within said barrel in the line of movement of said first pumping means.
  • a fluid metering device comprising;
  • first pumping means within said hollow interior comprising a piston in continuous sealing engagement with said housing and displaceable under fluid pressure between said second fluid inlet and said fluid outlet from an inlet position to an outlet position to cause mixed first and second fluids to be expelled through said fluid outlet e. biasing means tending to retain or restore said first pumping means at or to said inlet position in use f.
  • a passage through said piston communicating between said second fluid inlet and said fluid outlet closure means adapted to close said passage at said inlet position and also during displacement of said first pumping means under fluid pressure from said inlet position to said outlet position and to open said passage at said outlet position and also during movement of said first pumping means from said outlet position to said inlet position
  • a closure member within said hollow interior adapted to open and close said passage, said do sure member moving with, but being displaceable relative to, said piston, stop means coacting between said closure member and said piston and adapted to limit such relative displacement so-that said passage is closed on maximum relative displacement in one direction and opened on displacement in the reverse direction, engagement means adapted to alter the relative speed of said closure member and said piston at said outlet position, said closure member having a ratio of thrust surface presented to said second fluid inlet at said inlet position to biasing force tending in use to retain or restore said closure member at or to said inlet position which exceeds that of said first pumping means and 7 h.
  • second pumping means actuated on movement of said furst pumping means to cause a predetermined quantity of said first fluid to enter said hollow interior through said first fluid inlet on each cycle of said first pumping means
  • said second pumping means including a chamber interposed in said first fluid inlet and first and second one way valve means, said chamber communicating in use with a supply of first fluid via said first one way valve means and with said hollow interior via said second one way valve means, the volume of said chamber being adapted to fluctuate by a predetermined amount on cycling of said piston so that said predetermined quantity of said first fluid is pumped into said hollow interior.
  • a fluid metering device as claimed in claim 12 wherein said closure member has a ratio of thrust surface presented to said second fluid inlet at said inlet position to weight which exceeds that of said piston and said inlet position is adapted to be'lower than said outlet position in use so that said piston travels in a substantially vertical direction and the density of said piston is adapted to exceed that of said second fluid.
  • unbalanced recoil force of said engagement means provides an initial acceleration to said closure member, displacing it relative to said piston toopen said passage quickly.
  • a fluid metering device as claimed in claim 14 wherein said chamber is defined by a barrel and 'a plunger movable within said barrel in the line of movement of said first pumping means.
  • a fluid metering device comprising;
  • a housing with a hollow interior b. first and second fluid inlets into said hollow interior for first and second fluids respectively 0. a fluid outlet from said hollow interior d.
  • first pumping means within said hollow interior slidable under fluid pressure between said second fluid inlet and said fluid outlet from an inlet position to an outlet position to cause mixed first and second fluids to be expelled through said fluid outlet e. biasing means tending to retain or restore said first pumping means at one said "inlet position in use f.
  • said closure means comprising a resilient skirt on the inlet side of said first pumping means adapted to open said passage except when the circumference is forced into contact with said housing and a difference in fluid pressure is applied between its sides with a higher fluid pressure on the second fluid inlet side, said fluid outlet being positioned so that said skirt uncovers said fluid outlet at said outlet position, thereby equalising the pressure and opening said passage and h.
  • second pumping means actuated on movement of said first pumping means to cause a predetermined quantity of said first fluid to enter said hollow interior through said first fluid inlet on each cycle of said first pumping means.

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US00294984A 1971-10-05 1972-10-04 Fluid metering device Expired - Lifetime US3818924A (en)

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NZ16508771 1971-10-05

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US05/619,951 Reissue USRE29193E (en) 1971-10-05 1975-10-06 Fluid metering device

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US3818924A true US3818924A (en) 1974-06-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00294984A Expired - Lifetime US3818924A (en) 1971-10-05 1972-10-04 Fluid metering device

Country Status (6)

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US (1) US3818924A (fr)
CA (1) CA967753A (fr)
FR (1) FR2157829B1 (fr)
GB (1) GB1368523A (fr)
NZ (1) NZ179099A (fr)
ZA (1) ZA727097B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937241A (en) * 1973-11-29 1976-02-10 Philippe Cloup Device for injecting an adjuvant into a liquid
US3971341A (en) * 1973-12-18 1976-07-27 Dan Bron Automatic proportioner for low-pressure watering troughs
EP0020309A1 (fr) * 1979-05-04 1980-12-10 CENTRO RICERCHE FIAT S.p.A. Dispositif de dosage d'un additif à un courant de liquide
US4691721A (en) * 1984-12-07 1987-09-08 Ecolab Inc. Volumetric gravity feed liquid dispenser
US4827875A (en) * 1987-01-29 1989-05-09 Rumen Chemie Ag Dilution valves
EP1687529B1 (fr) * 2003-11-07 2017-01-11 Urrutia, Stéphane Moteur hydraulique a soufflets et pompe doseuse comportant ledit moteur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228560A (en) * 1964-01-22 1966-01-11 Slip Internat Ltd Apparatus for mixing fluids
US3489162A (en) * 1967-08-02 1970-01-13 Meynell Valves Apparatus for mixing fluids in constant proportions
US3604444A (en) * 1969-11-19 1971-09-14 Well S Asbestos And Engineerin Device for mixing hot and cold fluids

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2789510A (en) * 1954-03-11 1957-04-23 Black Sivalls & Bryson Inc Liquid injector
GB1089512A (en) * 1964-01-22 1967-11-01 Percy George Tacchi Apparatus for injecting a secondary fluid into a primary fluid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228560A (en) * 1964-01-22 1966-01-11 Slip Internat Ltd Apparatus for mixing fluids
US3489162A (en) * 1967-08-02 1970-01-13 Meynell Valves Apparatus for mixing fluids in constant proportions
US3604444A (en) * 1969-11-19 1971-09-14 Well S Asbestos And Engineerin Device for mixing hot and cold fluids

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937241A (en) * 1973-11-29 1976-02-10 Philippe Cloup Device for injecting an adjuvant into a liquid
US3971341A (en) * 1973-12-18 1976-07-27 Dan Bron Automatic proportioner for low-pressure watering troughs
EP0020309A1 (fr) * 1979-05-04 1980-12-10 CENTRO RICERCHE FIAT S.p.A. Dispositif de dosage d'un additif à un courant de liquide
US4691721A (en) * 1984-12-07 1987-09-08 Ecolab Inc. Volumetric gravity feed liquid dispenser
US4827875A (en) * 1987-01-29 1989-05-09 Rumen Chemie Ag Dilution valves
EP1687529B1 (fr) * 2003-11-07 2017-01-11 Urrutia, Stéphane Moteur hydraulique a soufflets et pompe doseuse comportant ledit moteur

Also Published As

Publication number Publication date
CA967753A (en) 1975-05-20
NZ179099A (en) 1979-01-11
GB1368523A (en) 1974-09-25
ZA727097B (en) 1973-06-27
FR2157829A1 (fr) 1973-06-08
FR2157829B1 (fr) 1976-07-23
AU4742972A (en) 1974-04-11

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