US2384172A - Pump - Google Patents

Description

Sept. 4, 1945. R. J. JAUCH ETAL UMP Jun

6 ShOQQfih 2 E; NVENToR.

filfzerwofi z v 5'- Sept. 4, 1945. R. J. JAUCH srm.

PUMP

' 6 Sheets-Sheet 3 Filed June 23, 1944 4 ,l \\\\\\\\\:1 I, I vi TE I l A 0 7/7/11 n I I 1 Y mmvron fiober'tJJaqch, y .ilzarwo' d mafia,

sept- 1945- R. J. JAucl-l ETAL 2,384,172.

PUMP

Filed June 23, 1944 6 Sheets-Sheet 5 INVENTOR. fiober'z J Jag 1 ch f jfzerwoiiflndg R. J. JAUCH ETAL PUMP Filed June 23, 1944 Sept. 4, 1945.

6 Sheets-Sheet 6 Patented Sept. 4, 1945 ,PUMP

Robert J. Jauch, Fort Wayne, and Sherwood Hinds, Columbia City, Ind., asslgnors to The Wayne Pump Company, Fort Wayne, 11101., a

corporation of Maryland Application June 23, 1944, Serial No. 541,766

8 Claims. (01. 103-113) This invention pertains to pumping units and more particularly pumping units adapted particularly to handle volatile liquids such as gasoline, benzene, naphtha and the like.

. Some liquid pumps are adapted particularly to handle liquids such as water, where there is substantially no problem involved in handling air or vapor in connection with the dispensing of the liquid, and where it is not necessary to deliver solid liquid for metering. However, there are- 1 stantially dry condition and wherein there is little opportunity to conveniently prime the pump by means external 01' the pump.

Further, it is desired that the dispensing means in the pump operate under the most favorable conditions, that is, a condition of flooded suction even though the actual source of supply from which the pump is drawing is at a lower level than the actual pumping unit. 1

Additionally, where airplanes and other vehicles are being fueled, it is highly'desirable and frequently necessary that the fuel be supplied, vapor-free, at a high rate.

In the case of positive displacement pumps now being used, there is a substantially metal-to-metal engagement between the operating parts. These pumps, which include the gear type of pump. can be counted upon to produce a substantially high vacuum (26" to 28" of mercury, depending on the locality), when wet or primed. The gear type of pump, however, cannot be successfully used with tolerances close enough to produce a high vacuum when dry when dispensing non-lubricating liquid such as gasoline, the wear is excessite. This also applies to the other positive displacement type of pumps such as the bucket, bladed type, and the like. There is an additional diiliculty with these pumps in. that when it is attempted to prime them dry or when the liquid becomes vaporized, or when they run dry in operation, an often disastrous wear takes place due to the lack of the lubrication provided by the liquid being pumped.

more stages, is simple in construction having a rapidly whirling wheel or impeller that in itself is incapable of producing high vacuum, but candispense liquid efllciently if the liquid is brought to the inlet or eye of the impeller. As in the case of positive displacement pumps, centrifugal pumps can likewise be broken down into a number of types. Generally they fall into three classifications, the conventional centrifugal which operates on flooded suction, employed for dispensing only. The centrifugal, to which has been added some means for effecting a prime, placing it in the classification of a self-priming centrifugal. Still a third employs means for establishing prime and the continuous elimination of air or vapor which may be referred to as a self-priming, air-eliminating centrifugal unit. This latter type isshown and described in Patent No. 2,124,681 to Jauch et a1. granted July 26, 1938. g

A piston type pump is a very eillclent type of pump to create a vacuum, but has been found to be very inefllcient to pump liquid, and additionally cannot operate at high speed and will not deliver a steady stream of liquid.

It is thus desirable to provide a pump which Another object is to provide a pump which is self-priming and wherein liquid is dispensed only after a predetermined pressure is built up.

Another object is to provide a pump wherein a centrifugal pump'is used for dispensing liquid, but wherein the pump is primed and air eliminated by a piston type pump.

Another object is to provide a pump wherein a centrifugal pump is used to dispense solid liquid and wherein air and vapor is eliminated on the suction side of the centrifugal pump.

Another object is to provide a liquid dispensing apparatus operable todispense liquid after a predetermined pressure is built up.

Another object is to provide a pumping'unit operable after a predetermined vacuum is attained, but capable of throttling ln-the event of leakage in the suction or reduction of vacuum.

Another object is to provide a pump 'l unit capable of delivery under the most favorable simulated conditions, i. e., flooded suction, regardless of the disposition of the'source of supply.

With these and variom other objects in view,

-the invention'may consist of certain novel features of construction and operation as will be more fully described and particularly pointed out in the specification, drawings and claims appended hereto.

In the drawings which illustrate embodiments of the device and wherein like reference characters are used to designate like parts- Figure 1 is a side'elevation, partly in section. of one form of pump embodying the invention, the section being taken through the inlet, suction tank and piston pump;

Figure 2 is a top plan view, partly in section, of the pump illustrated in Figure 1, the section being taken substantially in the plane as indicated by the line 2-2 of Figure 1;

Figure 3 is a transverse sectional elevation taken substantially in the plane as indicated by the line 3-3 of Figure 2;

Figure 4 is a side elevation of the pump illustrated in Figures 1 to 3, the same looking toward the left as viewed in Figure 2;

Figure 5 is an elevation, partly in section, of a modified form of pump embodying the invention;

Figure 6 is an elevation ofthe pump illustrated in Figure 5, the same looking toward the right as viewed in said figure;

Figure 7 is an enlarged fragmentary sectional .elevation of a portion of the pump shown in anti-friction bearings 24 and 26, the bearings 24 being retained in place as at 28, while the bearings 26 are retained in place as at 30.

Shaft I8 is provided with the sleeve 32, pressed or otherwise tightly fitted to said shaft, and the seal 34 is disposed to prevent leakage through the end plate 36 of the housing adjacent the sleeve 32.

The shaft "I8 is provided with the eccentric 38 (or crank), said eccentric being keyed as at 40 to said shaft and being positioned by means of the nut 42, threaded to the crank shaft. The opposite end of the eccentric 38 bears against and is positioned by the sleeve 44 on which the oiling disc 46 is non-rotatably mounted.

Bearing 28 is mounted on a diminished portion of thesleeve 44 and the inner race ring abuts a. shoulder 48 of the shaft, and the outer race ring abuts against a seal 50, disposed in the recess 52, provided in the inner crank case cover 54 of the crank case 20, said cover 54 being suitably secured to the pump housing 22.

The piston or connecting rod 56 is rotatably mounted on the eccentric 38 and the upper end of said piston rod is pivotally connected through the wrist pin 58, to the piston 60, slidably mounted in the cylinder 62, the piston 60 being provided with suitable rings 64. The connecting rod is provided with the pin 66, adapted to dip into oil contained in the oil pan 68, whereby lubrication is had by the splashing of the oil by the pin. Constant level is maintained in the pan 68 by means of the disc 46, which constantly dips into the sump I0 of the crank case below the pan 68. This causes the oil to be taken from the sump and thrown by centrifugal force around the wall of the crank case where it drains .back into the pan 68. The oiling means just described and the valves to be described are more particularly shown in Patent No. 2,267,479, Sturm et aL,

granted December 23, 1941.

communication with the atmosphere through the pipe 82, which may be provided with a suitable mufller, not shown, The inlet valve I4 communicates with the passage 84, which in turn communicates with the passage 86 provided in the crank case housing, said passage 86 being connected to pipe 88 through'coupling 90, and com-' municating with passage 92 through coupling 94.

Passage 82 is disposed in the suction inlet casting 96, which is suitably secured to the impeller pump housing 22.

The casting 96 is provided with the inlet 98 which communicates through screen I00 with the suction tank I02 and said casting is provided with the passage I04 which communicates with the passage I06 of the impeller pump housing 22, the passage I06 communicating with the eye I08 of the impeller 0, said impeller being fixed to the shaft I8.

The suction tank I02 is provided with the riser tube II2, communicating with the passage 92 and extending to a point adjacent the top of the suction tank I02. The upper end of the riser tube H2 is provided with the valve II4, controlled by the float H6. The float H6 is pivoted as at II8 to the lever I20, said lever being pivoted as at I22 to a support on the valve seat I24 and the opposite end of the lever being loosely connected to the valve as at I26. The float is provided with the guide stern I28, slidably mounted in the guide I30 carried by the tube II2.

In order to prevent the piston 60 from pumping oil the pressures on the opposite sides of the piston are substantially balanced by the passage I32 which connects the passage 86 with the inside of the crank case housing 20.

The impeller II 0 isadapted to rotate in the impeller discharge housing I34, said discharge housing communicating with the passage I36 provided in the outlet valve housing I38. The housing I36 is provided with the outlet passage I40, adapted to be closed from the passage I36 by means of the sleeve valve I42, said'sleeve valve being adapted to close communication between said passages when it is seated on the valve seat I44.v The sleeve valve is adapted to slide in the cylinder I46 provided in the'housing I38, the valve being provided with a suitable piston I43 which is made substantially liquid tight by means of suitable spring pressed leathers IE0 or other suitable means. 4

v The valve and piston are provided with the balancing orifice I52 which provides communication between opposite sides of the piston, and a suitable spring I54 is provided seated at one end on the piston and at other end in the spring seat I56 in the-housing I58,,said spring urging the 'posite to the passage I88, communicates through passages I80 and I82 with the seat I84, said seat being provided with the valve I88 urged towards 'closed position by means of the spring I88. Y The spring I68 seats at one end on the spring seat I of housing I and at the-other end on the flexible diaphragm I12, said diaphragm being secured between the flanges I14 and I18 of housings I88 and Ill. The diaphragm is provided with the plunger Ill extending through the guide I80 and engaging the valve I88 for controlling said valve by the spring I88 and the diaphragm I12. The valve chamber I82 communicates through the passages I84 and I88 with the impeller suction chamber I 08. The housing III for the spring I88 communicates through coupling I80, pipe I82 and coupling I84 with the inside of the crank case housing 20.

While the tube I82 is shown as connected to the crank case housing (being vacuumlzed through the passage I82), it is of course understood that this tube could be connected to the suction side of the piston pump, that is, it might be connected to the passage 84, pipe 88 or passage 82.

It has been found, however, that by connecting it to the vacuumized crank case housing that a lighter spring I88 can be provided and there is less fluttering efi'ect of the diaphragm I12.

Let it be assumed that the pumping unit described is connected through the inlet 88 with a source of supply at a lower level than the inlet 98, and that the pumping unit is dry and has absolutely no priming liquid in any part of the unit, and that it is desired to draw the liquid from the source of supply and deliver it to a container as through a meter. In the pumping of some liquid, such as gasoline, at true measure must be had of the liquid to be dispensed, thus no air can be delivered through the outlet I40 to meter. Operation of the motor I2 or other source of power supply causes rotation of the shaft I8, which in turn rotates the impeller IIO and causes reciprocation of the piston 80. The pump being dry, the valve I42 will be closed, that is, will be in' the position as illustrated in Figure 2 and the valve I86 will also be closed. The-valve H4 in the suction tank will be open.

Rotation of the shaft II8 causes the piston pump to vacuumize the suction tank I02 through valve II4, pipe I I 2, passage 82, pipe 88, passage 84 and inlet valve 14. During operation of the piston pump it will be noted that the chamber of the crank case is also vacuumized through the passage I32 50 that there is no tendency for the piston to pump oil and there will be a proper lubrication, without loss of lubricant.

The pin 88 will dip into the oil in the pan 88 causing the oil to splash to the rotating parts in the crank case housing and rotation of the disc '48 will cause oil to be thrown by centrifugal iorce'toithe sides of the crank case housing, where it. will= drain into the pan 88; maintaining the proper level, all as described in said Patent No. 2,267,479.

When the piston pump is vacuumizing the suction tank, it also is vacuumizing the impeller pump housing, the passage I38 and the cylinder I48, whereby there is a balanced condition of the valve so that under this condition the spring I84 is the only means of maintaining the valve I42 in seated position.

The vacuum induced in the suction tank I02 causes liquid to be drawn from the source of supply through the passage 88 into the suction tank I02, through the screen I00. It will then be drawn through the passage I04, the impeller suction maintain the balanced condition of the. valve.

This liquid delivered through orifice I82 is not at suflicient pressure to open the valve I88. Liquid will continue to be supplied to the suction tank I02 with the valve I42 closed until a predetermined liquid level is reached, at which time the float I I6 will close the valve I I4.

' Closing the valve I I4 will cause a high vacuum through passages 84, I32, crank case housing 20, pipe I92 and housing I, thus causing a high vacuum on the diaphragm I12. The :float and valve are so arranged that the valve I I4 will close long prior to the approach of the liquid level to the valve so that no liquid can ever get into the piston. pump In other words an air chamber is always insured at the top of the tank I02. This high vacuum will cause the diaphragm to move upwardly as viewed in Figure 2 against the spring I68, raising the pin I'I8 from the valve I86, permitting the valve to open, thus permitting liquid to flow through passages I84I 86 to the impeller suction housin I06. The orifice I52 being smaller than the opening controlled by the valve I66 will cause a reduction of pressure in the cylinder I48- n the side of the valve opposite to the seat I44. This condition will permit the increased pressure on the side of the valve adjacent the seat I44 to open the valve I42, permitting discharge through the outlet I40.

It will be understood that the valve I42v will only open in the event there is solid liquid at the valve; in other words, if there is air or a mixture of air and liquid at the valve I42, said valve will not open even though the valve I66 opens. The valve I86 opening prior to the opening of the valve I42 permits the air or mixture of air and liquid at the valve I42 to pass through the orifice I52, passage I82, passages I84 and I86 to the impeller suction chamber I06. The air then will work its way back into the suction tank I02 where it will seek a high level and will evacuate whenever the valve II4 opens. When there is solid liquid at the valve I42, said valve will open as already described and thereafter should air be introduced into the suction line between. the pump and the source of supp y. said air will enter the suction tank I02,causing a drop in the liquid level. within the tank which in turn causes the float II6 to drop, opening the valve H4.

As soon as the valve I I4 opens the air in the suctiontank will be drawn through the riser tube II2, passage 92, pipe 88, and through the piston pump to the atmosphere through the pipe 82. As soon as air is discharged, the liquid level in the suction tank will rise, causin the valve II4 to close, which in turn causes the valve I66 to open as in the manner already described, thus permitting valve I42 to open and the dispensing operation to continue. Should there be continuous leaking, that is, to a point where the valve H4 is alternately opening or closing, the pump will still continue to discharge liquid at a reduced quantity, though the valve I42 will throttle, and the pump will continue to deliver liquid until the amount of air introduced into the suction tank exceeds the displacement of the piston pump, at

which time the pressures on opposite sides of the' diaphragm I12 will equalize, causing the valve I66 to close and consequently causing the valve 254 and a suction or inlet chamber 258' communicating with a suitable inlet 258. The impeller housing 254 is closed by means of the cover plate 260, and the impeller 262 is rotatably mounted in said impeller housing. The outer periphery of the eye of the impeller rotates in the fixed wearing ring 264 and the clearances between the outer periphery of the impeller eye and the ring are such that no wear takes place between these parts. The wear ring is provided with the reentrant flange portion 266 directed into the eye of the impeller so that should any liquid pass between the impeller and the ring 264 it will be directed into the eye of the impeller rather than against the liquid normally entering the eye.

The impeller is rotated by means of the shaft 268 secured thereto as at 210 and said shaft passes through a gasoline seal 212 and oil seal .214 and is supported on bearing 216 retained by the ring 218. The shaft extends into the vacuum pump crank case 280 and is rotatably mounted on bearing 282 provided in the housing 284 in which is disposed the seal 266. The shaft extends outwardly of housing 284 and provides aportion 268 for coupling to suitable drive means such as an electric motor, gasoline motor or the like. The impeller chamber 254 is provided with a voluted outlet passage 280 and is provided with the flange 292 fastened as at 294 to the flange 286 of the outlet valve housing 288.

The outlet valve housing is provided with the outlet 300 provided with the flange 302 adapted to be secured to suitable discharge means. A sleeve valve 304 is adaptedto close the outlet 800 and is adapted to be moved vertically upwardly from the position illustrated in the Figure 8 to ing 828 and is suitably secured thereto. The other end of the lever 840 engages the slidevalve 848, said valve being adapted inclosed position to be seated on the seat 860 provided on the pedestal 844, thepedestal being supported on the pipe 352 permitting ingress to the auxiliary float chamber 854. A restrictive opening 856 permits communication between the chamber 826 and pipe 852 for the purpose to be later described.

Within the auxiliary float'chamber 854 there is provided a float 858, said float being provided with a supporting rod 360 pivoted at 862 to the support 864, and rod 866 is pivoted as at 868 to the rod 860 and is pivoted as at 310 to the slide valve 812. Upward movement of the float causes the valve 812 to move upwardly and be seated in closed position on the seat 814. The seat 814 communicates with the pipe 816, the

' other end of said pipe being connected as at 818 open the outlet. The sleeve valve 804 is adapted to reciprocate in the cylinder 806 and is provided with the valve rod 808 extending upwardly and having the piston 8'l0 secured thereto. A suitable weight8l2 continually urges the valve 804 toward closed position on itsseat 8. There is,

however, a passage through the sleeve valve as indicated by the arrow 8l6 and there is clearance at 826 to the pump housing 252, and surge ring 888 is interposed between said housings to prevent a sudden surge of the liquid upwardly into the housing 326, and within the housing 826 there is also provided a baflle surge ring 882 fixed to the float 884 so that should there be a surge of liquid the float and surge ring would be urged upwardly by the force of the liquid as well as the buoyancy of the liquid. The float 884 is provided with the guiding and lifting'rod 886 pivoted adjacent the upper end as of 888 to the lever 840, the lever being pivoted as at 842 to the pedestal 884. I

The cap 846 closes the upper end of the housto the suction valve chamber 880 provided in the piston head 882 of the vacuum pump.

The head 882 is supported on the cylinder block 884 which is preferably integral with, the crank case 280 and is suitably secured to the pump casing 252 whereby a unitary structure is provided. The shaft 266 is provided with the crank shaftportion 366to which the piston rod 866 is rotatably secured. The upper end of the piston rod is secured through the pin 880 to the reciprocating piston '392. -The crank shaft 886 is provided with the oiling disc 884 offset to act as a counterbalance for the piston, and being adapted to dip into the lubricant in the crank case to throw it outwardly whereupon it can be trapped within the pan886 and any excess may overflow and spill into the crank case. The piston rod 888 is provided with the splash pin 888 'adapted'to dip into the liquid. The pan 866 for lubricating purposes, has already been described and the lubricating passage 400 is provided for conducting lubricant to the bearing 216.

The head 882 is provided with the suction valve chamber 880 closed by the suction valve 402 and is provided with the outlet valve chamber 404 closed by the outlet valve 406. The chamber 404 is provided with the plug 408 which may be removed for connecting the chamber to a suitable remote vent such as where the connection is carried back to the supply tank and vented therethrough. A muiller 4| 0 is also secured to the head 882 and in communication with the chamber 404 and is used unless the remote vent is used. A- passage 2 forms a communication between the suction valve chamber 860 and the crank case 280 for equalizing the pressures therebetween whereby there is no tendency for oil the inlet chamber 256 and the float chamber housing 826 at a suitably high point in the housing 826 whereby should'there be an influx of air into the inlet chamber this air will quickly find its way above the float and can thus be quickly exhausted through the vacuum pump without having 'to seek its way through the liquid con tained in the float chamber housing.

Assuming that the inlet 258 is secured to a suitable source of supply and assuming that the-outlet 802 is secured to a suitable dispensing means and that the centrifugal pump is dry and it is desired to d pense liquid, the operating means causes rotation of the shaft 2" thus rotating the impeller 2'2 and the crank shaft I" reciproeating the piston 39!. The valve 304 will be closed and therefore no fluid can be drawn from the outlet through passage 32! and pipe I to the suction chamber 256. Reciprocation of the piston causes a vacuum to be produced through chamber Ill, pipe 316, chamber), housing 326 and inlet chamber 255. The air will be withdrawn through .the connections just named and expelled as through the vent or'muiller ill, or connection at 408 whichever is used. Liquid will/finally be drawn into the inlet chamber 2" and will rise into the float chamber housing I" to a point where the float 334 is raised to close the valve "8.

Liquid then will be moved through the volute said impeller chamber, the eye of said impeller communicating with the suction chamber for receiving liquid therefrom, a housing comprising a float chamber communicating with said suction chamber adjacent the bottom of said float chamber, a passage communicating with said suction chamber and extending upwardly and communiand vapor from said float chamber, said means III by the impeller to the valve 1 and liquid under pressure will pass through the valve upwardlyand will act on the underside of the piston ill. At the same time, suction from the inall air trapped, from time to time, in the casing 252 so that the impeller will always pump solid liquid. It is to be noted that should any air be introduced into the housing 258 it; will immediately cause the valve 304 to be closed or throttled as the vacuum above the piston 3! will be reduced thus permitting the weight ill to immediately become effective to close or throttle the valve.

The valve is necessary where it is desiredthat air elimination take place where a suflicienthead on the outlet side is not provided to insure that the air be raised above the impeller housing so that it can readily be discharged through the vacuum pump. If a meter is 'not to be used in connection with the pump, of course, no automatic valve is necessary and a hand operated valve may be used. Should the float l" fail and should liquid rise a sufficient height in the housing 326 to flow into the auxiliary housing 354, the float 358 will close the valve 312 and prevent liquid from flowing into the inlet chamber 380. Should, however, both floats fail,- the restricted opening 355 is so determined that only an amount of liquid will be supplied to the vacuum pump that can be readily discharged. Should leakage occur past the seal- 214, it would be an oil leakage and the oil would pass through the tell-tale lit and when detected would indicate that the seal 2" leaked. Should, however, gasoline or the pumped fluid pass through the telltale 8, it would indicate that the seal 212 was leaking.

It is to be understood that we do not wish to be limited by the exact embodiment of the device shown, which is merely by way of illustration and not limitation, as various and other forms of the comprising a piston pump having a crank .case and a cylinder thereabove, a crank shaft in said crank case, said crank shaft extending into said centrifugal pump casing and providing a shaft for said impeller, a piston reciprocally mounted in said cylindermand connected by means of a connecting rod to said crank shaft, 8. cylinder head .on said cylinder having a suction chamber and an exhaust chamber, valves between said chambers and the upper part of said cylinder above thepiston, a connection between said float chamber and said piston pump suction chamber, a connection between said piston pump suction chamber and said'crank case, a discharge valve connected to the impeller chamber outlet; means urging said valve to closed position, a housing having a cylinder adjacent said valve connected chamber and a suction chamber, said suctionchamber having-an inlet and said impeller chamber having an outlet, an impeller rotatably mounted in said impeller chamber, the eye of said impeller communicating with the suction chamber for receiving liquid therefrom, a housing comprising a float chamber communicating with said suction chamber adjacent the bottom of said float chamber, an outlet adjacent a high point in said float chamber, a float and valve-for controlling said outlet in accordance with the liquid level in said float chamber, means for exhausting air and vapor from said float chamber, said means comprising a piston pump having a crank v case and a cylinder thereabove, a crank shaft in said crank case, said crank shaft extending into said centrifugal pump casing and providing a shaft for said impeller, a piston reciprocally mounted in said cylinder and connected by means of a connecting rod to said crank shaft, a cylinder head on said cylinder having a suction chem? ber and an exhaust chamber, valves between said chambers and the upper part of said cylinder above the piston, a connection between said float chamber and said piston pump suction chamber; a connection between saidpiston pump suction chamber and said crank case, a discharge valve connected to the impeller chamber outlet, means urging said valve to closed position, a housing having a cylinder adjacent said-valve connected to said crank case whereby suction from said crank case is imparted to said last named cylinder, a piston in said last named cylinder connected to said last named valve whereby suction in chamber for receiving liquid therefrom, a housing comprising a float chamber communicating with said suction chamber adjacent the bottom of said float chamber, a passage communicating with said suction chamber and extending upward ly and communicating with said float chamber adjacent a high point thereof, an outlet adjacent a high point in said float chamber, a float and valve for controlling said outlet in accordance with the liquid level in said float chamber, means for exhausting air and vapor from. said float chamber, said means comprising a piston pump having a crank case and a cylinder 'thereabove, a crank shaft in said crank case, said crank shaft extending-into said centrifugal pump casing and providing a shaft for said impeller, a piston 'reciprocally mounted in said cylinder and connected by means of a connecting rod to said crank shaft, a cylinder head onsaid cylinder having a suction chamber and an exhaust chamber, valves between said chambers and/the upper part of said cylinder above the piston, a connection between said float chamber and said piston pump suction chamber, and a connection bet/ween said piston pumpsuction chamber and said crank case.

4. In a pumping unit, the combination of a centrifugal pump casing having an impellerchamber and a suction chamber, said suction chamber having an inlet and said impeller chamber having, an outlet, an impeller rotatably mounted in said impeller chamber, the eye of said impeller communicating with the suction chamber for receiving liquid therefrom, a housing comprising a float chamber communicating with said with said suction chamber 'adiacent'the bottom of said float chamber, a passage communicating with said suction chamber and extending upwardly and communicating with said float chamber adjacent a high point thereof, an outletadjacent a high point in said float chamber, a float and valve for controlling said outlet in accordance with the liquid level in said float chamber, means for exhausting air and vapor' from said float chamber, said means comprising a piston pump having a crank case and a cylinder thereabove, a crank shaft in said crank case, said crank shaft extending into said centrifugal pump casing and providing a shaft for said impeller, a piston reci-procally mounted in said cylinder and connected by means of a connecting rod to said crank shaft, a cylinder head on said cylinder having a suction chamber and an exhaust chamber,

suction chamber adjacent the bottom of said float chamber, an outlet adjacent a high point in said float chamber, a float and valve for controlling said outlet in accordance with the liquid level in said float chamber, means for exhausting air and vapor from said float chamber, said means comprising a piston pump having a crank case and a cylinder thereabove, a crank shaft in said crank case, said crank shaft extending into said centrifugal pump casing and providing a shaft for said impeller, a piston reciprocally mounted in said cylinder and connected by means of a connecting rod to said crank shaft, a 'cylinder head on said cylinder having a suction chamber and an exhaust chamber, valves 'be-,

chamber and a suctionchamber, said suction chamber having an inlet and'said impeller chamber having an outlet, an' 'impeller rotatably mounted in said impeller chamber, the eye of said impeller communicatingwith the suction chamber for receiving liquid therefrom, a housing comprising a float chamber communicating valves between said chambers and the upper part of said cylinder above the-piston, and a connection between said float chamber and said piston pump suction chamber.

6. In a pumping unit, the combination of a centrifugal pump casing having an impeller chamber and a suctionchamber, said suction chamber having an inlet and said impeller chamber having an outlet, an impeller rotatably mounted in said impeller chamber, the eye of said impeller communicating with the suction chamber for receiving liquid therefrom, a hous-' ing comprising a float chamber communicatin with said suction chamber adjacent the bottom of said float chamber, a passage communicating with said suction chamber and extending upwardly and communicating with said float chamber adjacent a high point thereof, an outlet adjacent a high point in said float chamber, a float and valve for controlling said outlet in accordance with the liquid level in said float chamber, means for exhausting air and vapor from said float chamber, said means comprising a piston pump having a crank case and a cylinder there a connection between said float chamber and" said piston pump suction chamber, adischargev valve connected to the impeller chamber outlet,

means urging said valve to closed position, a housing having a cylinder adjacent said valve" connected to said piston pump suction chamber whereby suction from said chamber is imparted to said last named cylinder, a piston in said last named cylinder connected to said last named valve whereby suction in said last named cylinder urges said last named valve to open position, said last .named valve being opened when said suction and the liquid delivery pressure on said valve reaches a predetermined amount.

7. In a pumping unit, the combination'of a I with said suction chamber adjacent the bottom of saidfloat chamber, an outlet adjacent a high point in said float chamber, a float and valve for controlling said outlet in accordance with the liquid level in said float chamber, means for ex- .hausting air and vapor from said float chamber, said means comprising a piston pump havin: a

crank case and a cylinderthereabove, a crank shaft in said crank case, said crank shaft extending into said centrifugal pump casing and providing a shaft for said impeller, a piston reciprocally mounted in said cylinder and connected by means of a connecting rod to said crank shalt, a cylinder head on said cylinder having a suction chamber and an exhaust chamber, valves between said chambers and the upper part of said cylinder above the piston, and a connection between said float chamber and said piston pump suction chamber.

8. In a pumping unit, the combination of a centrifugal pump casing having an impeller chamber and a suction'chamber, said suction chamber having aninlet and said impeller chamber having an outlet, an impeller rotatably mounted in said impeller chamber, the eye of said impeller communicating with the suction c amber for receiving liquid therefrom, a houslug comprising a float chamber communicatins with said suction chamber adjacent the bottom of said float chamber, an outlet adjacent a high point in said float chamber, a float and valve for controlling said outletin accordance with the liquid level in said float chamber, means for exhausting air and vapor from said float chamber, said means comprising a piston pump having a crank case and a cylinder thereabove, a crank shaft in said crank case, said crank shat-t extending into said centrifugal pump casing and providing a shaft for said impeller, a piston reciprocally mounted in said cylinder and connected by means oi a connecting rod'to said crank shalt, a cylinder head on said cylinder having a suction chamber and an exhaust chamber, valves between said chambers and the upper part or said cylinder above the piston, and a connection between said float chamber and said piston pump suction chamber, a discharge valve connected to the impeller chamber outlet, means urgingsaid valve to closed position, a housing having a cylinder adlacent said valve connected to said piston pump suction chamber rwhereby suction from said chamber is imparted tosaid last named cylinder, a piston in said last named cylinder connected '-to said last named valve whereby auction in said last named cylinder urges said last named valve to open position. said last named valve being opened when said suction and the liquid delivery pressure on said valve reaches a predetermined amount.

' ROBERT J. JAUOH. 00D KINDS.

Images