Патент USA US2411261код для вставки
Nov, 19, 1946. A. J. GRANBERG 2,411,261 FLUID METERING APPARATUS Filed June 17, 1942 "- 2 Sheets-Sheet 1 INVENTOR, . ALBERT J. GRANBERG. -m @W vA WT L/W. M 17,. Nn .1, 5. NOV. 19, 1946. A_ _J_ GRANBERG 2,411,261 v FLUID METERING APPARATUS Filed June 17, 1942 2 Sheets-Sheet 2 84 %W @m? 8/ _II/ 66 2 .w mm $9Z\_.O 4m 319$3M 08Z/0 w M9 m o Q3, z u.... a a N (6ItI m 9 IM , a 8 q 02.9M 0/9 9 Quid N M a 0 INVENTORT ALBERT J. GRANBERG. ATTORNEY. Patented Nov. 19, 1946 2,411,251 UNITED STATES PATENT OFFICE 2,411,261 FLUID METERING APPARATUS Albert J. Granbcrg, Oakland, Calif. Application June 17, 1942, Serial No. 447,421 5 Claims. (01. 73-200) My invention relates to metering apparatus for measuring liquids under ?ow conditions, and, lay valve assembly with the valve in its normal rest position; for purposes of illustration, will be described in - Figure 3 is a similar view showing the same connection with its application to the dispensing - valve assembly in fully open position; of gasoline, oil and the like from trucks to the storage tanks of service stations, though it is Figure 4 is a view in section taken on the line 4-4 of Figure 2; to‘be understood that the ?eld or utility of my in Figure 5 is a view in section taken on the line 5-5 of Figure 3; , vention is not restricted to such limited applica tion. Figure 6 is a fragmentary elevational vview of In the distribution of gasoline, oil, etc., the 10 the apparatus 01' Figure 1, showing a modi?ed same is discharged from tank trucks as when sup plying the underground storage tanks of a serv ?ow delay valve assembly; Figure 7 is a view in section of the modi?ed ?ow delay valve assembly, taken on the line 1-1 ice station i’or subsequent resale to customers. of Figure 6, and showing the valve in its normally The trucks are provided with ?uid meters through which the liquid is caused to ?ow and be 15 closed position; and Figure 8 is a similar view showing the valve in measured before entering the discharge hose, its fully open position. suitable means usually being associated with the In general, the objects of my invention are meter to remove air from the liquid prior to its realized by interposing in the ?uid path to the reaching the meter, so as to avoid false readings during a metering period. It has been found, 20 meter and preferably between the meter and the air separator, a flow delay valve or equivalent however, that errors in the meter recordings are structure, whose function it is to impede the full often introduced at the very start of a dispensing ?ow of ?uid to the meter during the initial, por period, the cause being traced to the fact that tion of a metering period and for a time suffi at the moment a discharge from the truck tank cient to permit the air separator to remove ac is started, the initial ?ow carries with it, through cumulated air therefrom. Following this, the the meter, a substantial amount of air which, line is completely opened to permit continuous due to leaks or other causes, may have accumu full capacity ?ow through the meter as long as lated in the line since the previous discharge, and desired, the air‘ separator being capable of re this is particularly apt to be the, case upon the ?rst discharge following the ?lling of an empty 30 moving the air normally present during such full capacity ?ow. \ truck tank. Referring to the drawings for a more detailed Among the objects of my invention are: description, I have illustrated in Figure l. a por (1) To provide novel and improved apparatus tion of the line I0 including the meter l2 and the for the removal of air from the initial flow of 35 air separator I4. The meter, in so far as the com ?uid to the meter; bination comprising the invention is concerned, (2) To provide novel and improved means for need not be limited to any speci?c typebut may precluding false readings in a ?uid recording be any meter capable of measuring liquid ?owing meter, normally attributable to the accumula therethrough. The particular meter which I have tion of air in the line, which air passes to the 40 shown for purposes of illustration is of the rotat meter with the initial ?ow of liquid thereto; able vane type disclosed ‘in the patent for Fluid (3) To provide novel and improved apparatus meter, No. 2,272,170, of February 10, 1942, ‘m to carry out the foregoing objects, which appara which I am joint inventor, and, as such, includes tus shall be compact and emcient in operation. Additional objects of my invention will be 45 an inlet IE to the interior compartments formed by the rotatable vanes (not shown), a discharge brought out in the following description of the is connecting to a hose 20 and a recorder ‘22 sup same taken in conjunction with the accompany ported on the meter and operated usually from me drawings wherein— the meter shaft. Figure 1 is an elevational view of the combina The air separator may be of any suitable type, tion comprising my invention, the combination 60 but, for purposes of illustration, I have selected being made novel by the cooperative inclusion of an air separator of the type also disclosed in the a. special ?ow delay valve assembly in a prior aforementioned patent,.although the same has known meter arrangement; been modi?ed toadaptit to the combination of Figure 2 is a view in section on line 2--2 of Fig the present case. Brie?y, it comprises a housing ure 1, showing one embodiment of such ?ow de 65 24, in the lower portion of which lies a cylindrical 2,411,261 3 4 ?lter 26 extending from the inlet opening to the. inwardly of the casing 38, whereby the valve in housing, and in the upper portion of the housing its normal rest position is partially open to permit of an initial, though limited, flow movement of Fluid to be discharged through the meter is the fluid in the line upon initiating a discharge, ?rst introduced into the lower section through such initial ?ow to be preferably just about su?l... the ?lter, to rise into the upper section where any cient to actuate the valve control mechanism. air in the fluid has an opportunity to separate By reason of the valve arrangement just de out therefrom. The ?oat 30, during high liquid scribed, it will be noted that the valve is not free level conditions, serves to hold the air release to open immediately upon initiating a discharge, valve 28 closed until the accumulation of air in 10 for the initial pressure surge against the valve the upper section of the housing lowers the liquid 64 is absorbed in overcoming the static inertia level and drops the ?oat'sui?ciently to pull the of the counterweight 54 acting through the link valve open and permit escape of the air. Air, in a direction opposing the opening of such valve, thus released, is conducted through an air tube and in attempting to force the piston forward 32 back into the main line at the discharge side against the liquid on the work side of the piston, of the meter, and in this manner is by-passed the relief opening 44 being'too small to afford around the meter and is not conducted through relief during this initial surge. Following the it to'give false readings. initial surge of pressure, the piston becomes re Ordinarily, the air separator I4 is connected sistively responsive to the pressure then existing to feed directly into the meter I2 and it is so 20 in the casing, by reason of the relief opening 44 disposed with respect thereto as to leave the meter which permits of a slow reduction of back pres fully primed between discharges. In the im sure against the work surface of the piston. A proved apparatus of my present invention, a flow slow forward movement of the piston will take delay valve 34 is interposed ‘between the air sepa place under these conditions until communication rator and the meter, and preferably disposed 25 between the piston groove 48 and the cylinder below the ?lter and in communication therewith groove 52 is established, when the back pressure and the input to the meter, so that all the liquid against the face of the piston is suddenly and ‘is an air release valve 28 controlled by a float 30. must pass through this valve on its way to the substantially entirely eliminated and the piston meter. is freed from such restraint. The result is a The valve 34 is operated through control mech 30 sudden completion of the piston stroke. During anism 36 which is housed in a casing 38 which the slow movement period of the piston, the valve may, if desired, constitute an integral portion of opening past the gate 64 is substantially un the air separator housing 24. This casing in affected, for while the larger portion 12 of the cludes a cylinder 40 extending outwardly from a gate is closing, the smaller section 68 is swinging side wall thereof, the cylinder preferably consti open, with the net result of substantially no tuting an independent element securely fastened in an opening in the wall of the casing and com change in the opening through the valve. The sudden and full release of the back pres sure against the piston is timed to occur when piston 42 reciprocally mounted in this cylinder, the larger gate section 12 is substantially closing is provided with a relief perforation 44 through 40 its portion of the fluid path through the valve the head 46 thereof, and, further, has its outer so that a full and complete opening of the valve cylindrical wall peripherally grooved, the groove will take place in response to the sudden forward 48 thus formed being made to communicate with thrust of the piston to the end of its stroke. The the interior of the casing by a hole 50 through holding up of the full capacity ?ow during the the reduced portion of the cylindrical wall. A resistive responsive period of the piston, which I longitudinal slot or groove 52 in the interior wall may be varied to suit conditions by altering any of the cylinder adjacent its outer end, provides of the factors determining the period, provides municating with the interior of the casing. A open communication between the work side of the the time interval necessary to remove any accu piston and the interior of the casing after the mulation of air from the liquid before sending piston has traveled but a portion of its full stroke. 50 it on through the meter. Forward movement of the piston in the cylinder Restoration of the piston to its normal rest is normally ‘retarded by a counterweight 54 piv position upon cessation of flow of fluid through otally secured to a bracket 56 mounted on an the line, is assured through the action of the inner wall of the casing and connected to the counterweight 54. Its return time may be mate piston 42 by a link 58 having one end secured i rially shortened by the addition of a valve 14 in through a hole 60 in the weight, and its other end the piston head, operative to permit of a quicker pivotally secured to the piston 42. interchange of ?uid from the interior of the cas Also pivotally secured to the piston is another ing to the work side of the piston on the return link 62. This link is pivotally secured adjacent stroke than would be permitted by the relief its other end, to the valve 34 which in this in 60 opening 44 itself. Such valve may take the form stance takes the form of an eccentrlcally mounted of a disc 16 at the work side of the piston and swingable gate 64 freely supported across the in slidably secured to the piston head by a stem 18. put IE to the meter within a frame 66 which is A perforation 80 or two through the head andv clamped between the output of the casing 38 and within the area covered by the disc 16 are thus the input 16 to the meter. The pivotal connec 65 adapted to be covered during the forward move tion of the link 62 is to the smaller section 68 of .ment of the piston, and uncovered during the the gate. A stop 10 at the edge of the smaller return movement. I section overhanging the same is adapted to abut The forward stroke of the piston may be deter against the inner edge of the valve supporting mined by impact of the piston against the end frame 68 to ?x the normal rest position of the 70 of the cylinder 40. I prefer, however, to avoid valve, which condition exists with the piston in such impact by terminating the stroke just short its retracted position, as indicated in Figure 2, of the end of the cylinder. This I accomplish by and when no liquid is ?owing in the line. providing an extension 82 at the gate end of the The longer section 12 of the valve, of this em link against whichthe gate will abut as the gate bodiment of my invention, is preferably bent 75 reaches its maximum desired open position, the 2,411,281 5 assembly being so designed that this will occur when the piston has reached the desired end of its stroke. 0 In the modi?ed form of valve assembly dis . closed in Figures 6, 7 and 8, the gate 84 is sub stantially planar and eccentrically pivoted, but in 1 its closed position, which coincides in this em ting a sudden and increased velocity of.’ travel of the piston for the remainder of its stroke. The forward movement of the piston is‘ against the action of the spring I22. Consequently. like the counterweight 54 of the previous embodi ment, ‘this spring will restore the piston and gate to their-normal rest positions, upon cessation of flow of liquid through the line to the meter, the bodiment with its normal rest position, su?icient clearance is provided‘ to permit-of an initial but length of piston rod 'II4 being preferably such , considerably limited ?ow, upon start of discharge 10 that the piston I08 does not strike the end of from the line. The rest position is ?xed by. a cylinder 88 in approaching its 'rest position. valve seat ?ange 85 extending inwardly on frame It is noted in connection with this second em 66. bodiment, that the turning moment on the'gate The valve control mechanism 86 includes a cyl : during the initial or resistively responsive portion inder 88 terminating in a threaded plug 90 where 15 of the piston stroke is quite small. This adds by it is aiiixed to the wall of the casing 38. The somewhat to the load resistance of the piston cylinder is formed with an integral angularly and, consequently, has the effect of increasing disposed offset 92 adjacent the casing wall in the hold-back period. Of course, the length of which the cylinder is mounted. The offset has a such period may be increased or decreased to suit bore 94 longitudinally therethrough communi 20 conditions, not onlyby the adjustment screw I24 cating with the interior of the cylinder adjacent but by utilizing a stiffer or weaker spring, as the casing wall and, by means of a hole 96 desired. through the plug, such communication is extend While I have described two embodiments of ed into the casing. The offset bore is closed at my invention, the same is susceptible to change its outer end by a screw closure 98 threaded 25 and alteration, without departing from the spirit therein, and is intersected at an intermediate thereof, and I accordingly do not desire to limit point by a longitudinal. passage I00 provided my protection to the speci?c details of these em within the wall of the cylinder. This longitudi bodiments, except as may be necessitated by the nal passage communicates with the interior of appended claims. the cylinder at longitudinally spaced points 30 I claim: through a pair of perforations I02 and I04, re 1. In combination, a ?uid meter, air-separa spectively, the ?rst at substantially the halfway tion means associated with liquid ?ow to said point and the other adjacent the end of the meter to separate air from liquid during normal cylinder. The construction of the cylinder may ?ow of such liquid to said meter, flow delay be facilitated by forming it open ended and cap 35 means extending only partially across the ?ow ping the open end with a plate I06 bolted there path to said meter at all times in the absence of on. ?ow therethrough to permit an initial reduced The piston may be of the cupped leather type, flow of liquid thereby to said meter, said ?ow that is, formed by a leather cup seal I00 held delay means being activated by said initial re between rigid discs H0 and H2, respectively, and 40 duced ?ow of liquid and including a slow release mounted at the end of a piston rod H4. The type “valve assembly for precluding full flow piston rod extends through the center of the plug during a time period su?icient to permit said air 90, and into the casing. At its inner end, is separation means to free the initial portion of mounted a two prong fork or guide IIG which liquid of excessive amounts of air trapped therein. extends toward the gate 84 and straddles a pivot 2. In combination, a. fluid meter, air-separa pin II8 carried between a pair of ears I20 on the tion means associated with liquid ?ow to said smaller section of the gate. A compression spring vmeter to separate air from liquid during normal I22 surrounding the piston rod exerts continuous flow of such liquid to said meter, a normally par pressure against the fork IIB, thereby tending at tially open ?ow controlled valve assembly, said all times to hold the piston in retracted position valve assembly being resistively responsive to and the gate in its normal closed position as illus the initial flow of liquid to said meter during a trated in Figure 7. metering operation and including time delay In the set-up just described, the bore opening means independent of liquid level for delaying 94 through the angular offset 92 functions in the full opening of the valve of said assembly, for same capacity as the relief opening 44 in the maintaining a reduced initial ?ow ‘of liquid through said meter over an initial time period ?rst embodiment described, since it maintains to permit said air-separation means to free the restricted communication between the work side of the piston and the interior of the casing during initial portion of liquid of excessive amounts of air trapped therein. movement of the piston from its normal rest posi tion to the opening I02. Such bore opening may 60 3. In combination, a fluid meter having an in be a ?xed unobstructed opening of limited size, let passage thereto for liquid to be metered, air but I prefer to make it over-size and adjust its separation means in the path of ?ow of such effective size by an adjusting screw I24 threadedly liquid to said meter for removal of air from such liquid existing therein during continuous ?ow received in the bore. This allows of substantial thereof to said meter, a gate in the inlet passage leeway in manufacturing tolerances, as the ad to said meter, and means independent of liquid justment permits regulation of the rate of travel level, resistively responsive to the initial flow of of the piston during the initial portion of its liquid through said meter and cooperating with forward stroke whereby the duration of the hold said gate to retard the full opening of said gate back period may be controlled. After passing the opening at the halfway mark, 70 for a period of time following the start of such liquid flow. this opening I02 then provides enlarged ?uid 4. In combination, a ?uid meter having an passage between the work side of the piston and inlet passage thereto for liquid to be metered, the interior of the casing, and the resistance pre viously encountered against the work surface of air-separation means associated with the flow the piston is essentially eliminated, thus permit 75 of such liquid to said meter for removal of air 2,411,201 from such liquid existing therein during con ‘ 8 liquid to said meter for removal 01' air from such tinuous ?ow thereof to said meter, a valve in the liquid existing therein during continuous ?ow inlet passage to said meter normally only par thereof to said meter, a normally partially open tially closing said passage to permit of an initial valve in the inlet passage to said meter, valve reduced ?ow oi’ liquid thereby, means normally control means independent of liquid level, re tending to hold said valve in said partially clos sistively responsive to the initial ?ow or liquid to in; condition, and piston means resistively're said meter and cooperative with said valve to re sponsive to said initial ‘?ow oi.’ liquid to‘ said meter vtard the full opening 01' said valve for a period for gradually overcoming the closing e?ect of or time following the start 01' such liquid ?ow, said closing means and causing a delayedopen 10 and means for restoring said valve to its partially ing of said valve. ‘ open condition upon cessation of liquid ?ow to 5. ‘In combination, a ?uid‘ meter having an said meter. . inlet passage thereto for liquid to be metered, air ' separation means in the path of ?ow of such ALBERT J.