US1745229A - Liquid-measuring pump - Google Patents

Description

Jan. 28', 1930. R. PORTE LIQUID MEASURING PUMP Filed Dec. 28, 21.927

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2 Sheets-Sheet 1 Inventor V i I GD G J Jan. 28, 1930. R. FORTE 1,745,229

LIQUID MEASURING PUMP Filed Dec. 28, 1927 2 Sheets-Sheet 2 Patented Jan. 28, 1930 UNITED STATES PATENT OFFICE RENE PORTE, OF LEVALLOIS PER-BET, FRANCE, ASSIGNOR TO SOCIE'IE ANONYME POUR TOUS APPARE-ILLAGES MECANIQUES, OF LEVALLOIS FERRET, FRANCE LIQUIDMIEASURING PUMP Application filed December 28, 1927, Serial No. 243,173, and in Belgium January 14, 1927.

The present invention relates to liquid measuring pumps and, more particularly, to those of the type designed to be used for volatile liquids like gasoline.

One of the objects of the invention is to provide means for filling the pump chambers and the teed and discharge conduits connected thereto before the pump begins to discharge.

Another object is to provide a clutch automatically operable to actuate the pump by the filling ot the pump chambers and the feed and discharge conduits connected thereto.

still further ob ects will appear in the course of the detailed description which will now be given with reference to the accompanying drawings, in which F l is a diagrammatic section through one constructive embodiment of the invention;

Fig. 2 shows part of the device illustrated in Fig. 1 at a different phase in the pumping operation Fig. 3 represents, in diagrammatic section a second form of the invention;

Fig. 4 is a detail of the machine illustrated in Fig. 3 showing the pump in operation;

Fig. 5 shows a modified form of the elements represented in Fig. 1;

Fig. 6 represents a third embodiment of the invention.

Referring to Figs. 1 and 2 of the drawings, there is shown a main pump assembly comprising a cylinder 1; a piston 2 fitted with aone way valve 3; a piston rod 41 having a rack 5 formed at one end thereof; a pinion 6 meshing with rack 5; a feed conduit 7 connected to a reservoir (not shown) and fitted. at its reservoir and pump extremities with valves of the type 8 for preventing reflux of liquid (the valve at the reservoir end is, of course, not shown) a discharge conduit 9 communicating through the intermediary of valve 10 with delivery conduit 11; and an air inlet valve 12 mounted in the wall of delivery conduit 11.

This main pump assembly operates in cooperation with an auxiliary pump assembly consisting of a cylinder and iston 13; a valve 14 controlling an intake conduit 15; a valve 16 controlling a discharge conduit 17 connected to the intake side of cylinder 1; a connecting rod 18 articulated with a crank mounted on a gear wheel 19; a pinion 2O arranged to be rotated by a crank 21; a balancing lever or levers 22 pivotally mounted on the shaft carrying gear an idling pinion 28 journalled on levers 22 and arranged to be constantly in mesh with pinion 20, and intermittently in mesh with gear 6; a chamber 2 1 communicating with the discharge side of cylinder 1; a flexible membrane 25 dividing chamber 241 into two non-communicating compartments; a spring 26 tending to push the membrane inward; and a rod 26 pivotally connected to lever 22 and responsive to movements of membrane 25.

The machine is completed by a float chamber 27 located at the upper end of conduit 9; a float 28 fitted with a needle 29; and an air inlet 30. Valve 10 tends to remain closed under the action of spring 31.

The above described combination of elenents operate in the following way :Assumming the apparatus to be empty, crank 21 is rotated clock-vise so that pump 1?) draws air out of conduits 15 and 7 and liquid into conduit 7. The air aspirated by pump 13 is forced, during the compression stroke, into conduit 17, thence through valve 3 into conduit 9, whence it escapes by way of orifice 30. When all of the air has been discharged, it is replaced by liquid which is pumped from feed conduit 7 into cylinder 1, conduit 9 and float chamber 27. Immediately after the liquid level has risen sufliciently to move float 28 into closed position, pressure is transmitted by the liquid in cylinder 1 and conduit 9 to flexible membrane 25 in chamber 2 1. Membrane 25, under the eflect of the liquid pressure, moves against the action of spring 26, causing lever 22 to rotate on its pivotal axis, thus forcing pinion 28 into mesh with pinion 6. The motion of crank 21 is thenceforth communicated to piston rod 4; through pinions 20, 2S and 6 (Fig. 2). It is, of course, to be understood (1) that the maximum instantaneous discharge capacity of auxiliary pump 13 is less than that of main pump 1, (2) and that springs 26 and 31 are so designed relatively to the height of column 9 i as that membrane 25 is displaced suilicientiy to effect a clutching action before valve opens.

\Vith the various pinions in the position shown in Fig. 2, liquid is pumped from conduit 7, through valve 3, into conduit 9, thence past valve 10, into delivery conduit 11. Valve 12 permits delivery conduit 11 to be emptied by gravity, as also any form of flexible hose (not shown) which may be attached to said conduit. The amount of liquid delivered may be fixed by calibrating cylinder 1 or by providing stops in cylinder 1 hunting the stroke of piston 2. During its discharge stroke piston 2 sucks liquid from conduit 7 through valve 8, any deficiency being made up by the action of auxiliary pump 13.

If, after piston 2 has completed a delivery stroke, it is desired to refill the pump for another delivery operation, it is only necessary to rotate crank 21 in the counter-clockwise direction, in which case, pump 13, which is actuated through the intermediary of an idling gear or the equivalent (not shown), will cease to feed liquid to cylinder 1, the pressure on membrane will be released and gear 23 will move out of mesh with pinion 6. Piston 2 will then descend by its own weight.

If for any reason, air enters the apparatus through conduit 7 during the upward movement of piston 2, it will be prevented from interfering with the delivery operation since the liquid being delivered is above piston 2 and under pressure, whereas the liquid below piston 2 is under diminished pressure due to the difference in capacity of pumps 1 and 13. When piston 2 has delivered the measured amount of liquid, counterclockwise movement of rod 21 will disengage pinions 23 and 6, piston 2 will descend by gravity and the air imprisoned under piston 2 will escape via valve 3, conduit 9 and orifice 30. hen a new pumping operation begins, rotation of crank 21 in the clockwise direction will expel the air in float chamber 27 in the manner already described.

Referring now to the modification repre sented in Figs. 3 and 4, there shown a device in which the main and auxiliary pump assemblies are combined so that the air in the measuring pump is removed by suction exerted on the discharge side of the main pump piston. The main pump assembly is substantially the same as that shown in Fig. 1 and need not be again described. Crank 21 attached to pinion 20, reciprocates connecting rod 18 and draws air out of conduits 34 and and out of a chamber 33 located above float assembly 27, 28, 29, 30 (similar to the one represented in Fig. 1) into pump chamber 32, whence it is discharged during the compression stroke. A chamber 24 containing a flexible membrane 25 and a spring 26, communicates with conduit 35. Membrlne 25 responds to the reduced pressure created in conduits 341, by the suction of pump 32 and actuatcs rod 26 to rotate lever 22 about the center of pinion 20 as an axis so as to move pinion 23 into and out of mesh with pinion 6 in a manner analogous to that described in connection with Figs. 1 and 2. It is well to intercal ite a small chamber containing a pair of spring actuated valves 36, 37 between chamber 24 and conduit 3 1. Valve 37 controls an orifice of smaller section than that controlled by valve 36, and serves to admit air to pump 32 when orifice 30 is closed by its float valve. Means are provided for maintaining valve 37 open when the main pump begins to deliver liquid, which means comprise a rod 38 positioned to be actuated by a pair of stops on rod 26, and a bent lever 40 pivotally mounted at 41 and articulating at 39 with rod 38, the free end of said lever contacting with the stem of valve 37. The various operating elements are so designed that valve 37 is pushed inwardly slightly after pinions 23 and 6 move into meshing relation. T o assure a slight retard, the end of rod 38 may be arranged to move in an elongated slot in rod 26 (not shown) or between a pair of stops as shown. This arrangement is designed to avoid continued oscillation of the membrane when pumping action begins.

The operation of this form of the invention difi'ers only in details from the one shown in Figs. 1 and 2. Pump 32 first draws all the air out of the measuring pump and then draws liquid into the main pump chambers, conduit 9 and float chamber 27 until orifice 30 is closed. Continued rotation of crank 21 creates a reduction of pressure on one side of membrane 25, thus raising lever 22 and bringing pinions 23 and 6 into mesh. The reversing operations are self-evident.

Fig. 5 shows a modified form of the device illustrated in Figs. 3 and 4. Here, the chamber containing valves 36 and 37 is replaced by a two way cook 42 so arranged that, when membrane 25 is in its normal position, conduits 34 and are in con'imunication, and when the valve is in the second of its two positions, pump 32 is cut oil from conduit 35 and instead draws in air through orifice 44 and conduit 34. In this form of the device, it is well to place a. valve 43 between conduit 35 and valve 12 so as to maintain the reduced pressure in conduit 35 while pump 32 is aspirating air through orifice 44.

The pump represented in Fig. 6 ditl'ers from those already described in providing means for automatically arresting the auxiliary pump 32 (or, in the case of the device shown in Fig. 1, auxiliary pump 13) as soon as pinions 23 and 6 move into meshing relation. Pump 32 is here driven from a gear 45 having a fixed axis and mounted so as to be barely in mesh with movable gear 23 when the latter begins to move into mesh with pinion 6. Gear 28 will, thus, alternately engage with pinions 6 and 45 under the action of membrane 25. The best arrangement of the various gears for obtaining the result desired is the following: the axes of pinions 6, 20 and 45 should form a right angle, and the axes of pinions 6, 23 and 45 should lie sub stantially in line with one another.

It will be noted that in the devices shown in Figs. 3 to 6, spring 31 shown in Fig. l is omitted. This is made possible by placing the seat of valve 10 substantially at the level of the liquid in float chamber 27 when the float valve is in closed or raised position.

It is to be understood that the invention is not to be taken as being limited to the particular structures described. Thus, the automatic auxiliary pump-releasing device shown in Fig. 6 may be fitted to other of the auxiliary pump assemblies; valve 10 represented in Figs. 3 and 6 may be replaced by the spring actuated valve shown in Fig. 1; etc.

hat I claim is 1. In a machine of the class described, the combination of a main pump assembly comprising a cylinder, a piston, a -feed conduit for supplying liquid to the cylinder, and a discharge conduit connected to the cylinder; an auxiliary pump assembly associated with said main pump assembly and operable to replace gases contained in the cylinder and in the discharge conduit of said main assembly by liquid ;-means providing a float chamber positioned adjacent the upper end of said discharge conduit, said float chamber means having an orifice formed therein, and a float valve controlling said orifice ;-and means operable by the blocking of said orifice to operate the piston of the main pump assembly.

2. In a machine of the class described the combination of a main pump assembly comprising. a cylinder, a piston, a piston rod having a rack associated therewith, a pinion engaging with said rack, a feed conduit for supplying liquid to the cylinder, and a discharge conduit connected to said cylinder an auxiliary pump assembly associated with said main pump assembly and comprising a reciprocating pump, and rotatable means for reciprocating said pump ;clutch means interposed between said rotatable means and the pinion associated with the piston rod of the main pump assembly ;nieans providing a float chamber positioned adjacent the upper end of the discharge conduit of the main pump assembly, said float chamber means having an opening therein, and a float valve operable to close said opening ;-and means operable by the closure of said opening to actuate the clutch means so as to transmit power from the rotatable means of the auxiliary pump assembly to the rack and pinion of the main pump assembly.

3. An apparatus of the class described comprising in combinationa cylinder pump having a measuring piston, feed and discharge conduits for said pump, means operable to replace gases contained in said cylinder and conduits with liquid while the piston is at rest, and means depending upon variations of pressure created by said first named means for actuating said measuring piston after complete filling of said cylinder pump and conduit with liquid.

l. An apparatus of the class described com prising in combination a cylinder having a measuring piston, feed and discharge conduits for said cylinder, a cylinder pump operable to replace gases contained in said cylinder and conduits with liquid while the piston is at rest, and means depending upon variation in pressure created by said cylinder pump for actuating said measuring piston after complete filling of said cylinder pump and. conduits with the liquid.

5. In an apparatus of the class described comprising in combination, a main pump assembly comprising a cylinder, a piston, and feed and discharge conduits for said cylinder, an auxiliary pump assembly connected to said main pump assembly and operable to replace gases contained in the cylinder and conduits of said main assembly withliquid, means providing a float chamber having a float therein and positioned adjacent the upper end of said discharge conduit, a float valveto control an orifice formed in said chamber means, and means operable by the blocking of said orifice when a predetermined level of liquid raises-said float to actuate the piston of said main pump assembly.

6. In an apparatus of the class described comprising in combination a main pump assembly comprising a cylinder, a piston, and feed and discharge conduits for said cylinder, an auxiliary pump assembly connected to said main pump assembly and operable to replace gases contained in the main pump and con duits of said main assembly with liquid, means providing a float chamber having a float and positioned adjacent the upper end of said discharge conduit, 21 float valve to control an orifice formed in said chamber means, a pressure operated valve in the discharge conduit of said cylinder, and means oper atcd by the blocking of said orifice upon the obtaining of a predetermined level of liquid in said discharge conduit foractuating said piston of the main pump assembly before said pressure operated valve means .is operated.

7. An apparatus of the class described comprising in combination a piston, a piston rod having a rack associated therewith, a pinion engaging with said rack, a feed conduit for supplying liquid to the cyllnder, and a discharge conduit connected to said cylinder; an

auxiliary pump assembly associated with said main pump assembly and comprising a reciprocating pump, and rotatable means for recipromtmg said pump; clutch means in tel-posed between said rotatable means and the pinion associated with the piston rod of the main pump assembly; a pressure operated valve in the discharge conduitof said cylinder, means providing a float chamber having I. float and positioned adjacent the upper end of said discharge conduit, :1 float valve controlling an orifice formed insaid cham ber means, and means operated by the closure of said orifice upon obtaining a predetermined liquid level to actuate the clutch means so that power may be transmitted from the rotatable means to the rack of the main pump assembly before said pressure operating valve mum is operated.

8. An apparatus of the class described comg in combination a liquid pump having intake and discharge conduits, an auxiliary pump. means to drive said auxiliary pump whereby to bring the liquid to a predetermined level in said liquid pump and its c011- dnits, and means operated by the liquid when said redetermincd level is reached to couple stid iquid pump to said driving means and to uncouple said liquid pump therefrom when the liquid is below said predetermined level.

9- An apparatus of the class described comin combination a dispensing pump lving intake and discharge conduits, a fillin; pump to fill said dispensing pump and its conduits to a predetermined level, means to drive said filling pump, float operated means to seal the upper end of said discharge conduit when a predetermined level is attained, and pressure responsive means operated by said liquid after said conduit is sealed to Connect said dispensing pump for operation.

10. An apparatus of the class described comprising in combination, a dispensing pump having intake and discharge conduits and in which a valve is mounted permitting the flow of liquid from the intake to the dis charge conduit, a filling pump connected to deliver liquid from said intake conduit to said pump and through said valve to said discharge conduit whereby to fill said pump and conduits to a predetermined level, means to drive said filling pump, and means operated by the liquid upon attaining a predetermined level to connect said dispensing pump for driving.

11. An apparatus as set forth in claim 10, in which the dispensing pump comprises a measuring piston in which said valve is located to permit flow of liquid from the intake to the discharge side thereof.

12. An apparatus of the class described comprising in combination a liquid dispensing pimp having intake and discharge conduits, a drive for said pump, an auxiliary pump to fill said dispensing pump and its conduits to a predetermined level, said dispensingpump being normally free from its driving means, a valve biased to normally close said discharge conduit whereby a pres: sure may be maintained therein, and means operated by the liquid at a predetcrn'iined level to close said discharge conduit whereby such pressure may be attained, and means op erated by the liquid while less than such pressure is maintained in said discharge conduit to connect said dispensing pump to its drive. whereby said dispensing pump may only be operated While said liquid is at said predetermined level.

13. An apparatus of the class described comprising in combination a liquid dispensing pump, having intake and discharge conduits, an auxiliary pump to fill said dispensing pump and conduits to a predetermined level ith liquid, common driving means for said pumps. said dispensing pump being normally free from said drive, and means operated by the presence of the predetermined level of liquid in said dispensing pump and conduits to connectsaid dispensing pump to said common drive.

14. An apparatus of the class described comprising in combination a dispensing pump having intake and discharge conduits and in which a valve is mounted for permitting the flow of liquid from the intake to the discharge conduit, a filling pump connected to deliver liquid from said. intake conduit to said pump and through said valve to said discharge conduit whereby to fill said pump and conduits to a. predetermined level, means to drive said filling pump, a float valve operated by the liquid upon attaining a predetermined level to seal the upper end of said discharge conduit, means to actuate said dispensing pump, and means responsive to pressure developed in said discharge conduit after said sealing by said float valve to ell ect the actuation of said actuating means.

In testimony whereof I have hereunto set my hand.

RENE POE-TE.

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