US1984391A - Liquid pump - Google Patents

Description

Patented Dec. 18, 1934 UNITED STATES PATENT OFFICE "1,984,391 LIQUID PUMP Robert s. Basseit, Buffalo, N. Y. Application December 9, 1931,Serial No. 519,967

3 Claims. (01. 221-95) My invention relates to improvements in liquid pumps which will draw inboth liquids and gases through the intake but from which the discharge oi. liquids only is desired from the outlet. MY- 5 invention relates particularly to grease pumps for handling automobile transmission and differential grease, which is pumped from small containers which are frequently emptied, with the result that air enters the intake of the pump, the grease in the container having reached a low level near the pump intake.

The object of my invention is to provide a means to separate gases, such as air, from liquids, such. as grease, and to discharge liquids only through the main outlet opening, the gases; together with a small amount or grease, being discharged through a secondary opening. 4

The result of my invention is to provide a practical method for the rapid dispensing of grease directly from a hose without the necessity of filling measuring containers with the grease to assure that air was not being measured together with thegrease by the measuring unit, which, in-

my drawing, is shown as a liquid operated grease meter the usual type.

, A novel feature of myinventlon is the discharge of the gases hack into the grease containersothatthesmallquantitiesotgrease,

which pass out with the gases, are automatically.

the same inside-diameter thromhout its-length.

'lheexactcross-sectionoithegasdischarge-mhe, hothattheupperneckandatthelowerportlon. isnotimportanthut,preterahly,slmuldbein thealnpeotasquareoracircle. Thetubeas soshcwnisreadilybendahletoalloweasylining upottheassembly.

In thisapplication'the'greatest width of the openingatanysectiontakenacrcssthetubewill be spoken of as the "width" though. inthe 56 o! a circular cross-section, which is the cus- .tomary form, the width, of course, will be the diameter.

In my drawing the figure is a central longitudinal view of my improved liquid pump, showing a section through the pump cylinder and the gas discharge tube, and showing the outside of the liquid operated metering'devic'e and discharge P pi 4 Pump cylinder 1 is within greasecontainer 2 and passes through grease container cover 3 in the usual manner. Driving pinion 4 and rack 5 move piston rod 6 up and down within pump cylinder 1. The exact construction of the pump or liquid circulating device is not restricted to ihe construction shown but may be of any suitable construction for creating a flow of grease toward the measuring device.

. '1 is the upper portion 01' the pump enclosing rack 5. 8 is the beginning of the discharge passage from the liquid circulating device. 91s a liquid operated meter of the usual type. 10 is the discharge tubing or pipe leading fromth'e lquid meter 9 and may be fitted with a conventional shut-oi! valve 11. which prevents the hose from draining when the pumping operation is stopped.

Elements 1 to 11 inclusive are all shown 01' conventionaldesign'and are not limited to the 13 in one' direction in' the usual manner. 19 is the main delivery opening iron the pump on which is mounted the liquid operated meter 9.

In the construction shown the pump discharges through an outlet fitting 15, which screws into the upper portion otthe pumpcasing 7. Outlet fitting 15 could have been shown integral with casing'l, astheexactconstruction onthis point is not important, but the construction shown of having'fitting 15 as a separate piece would probably be moteconvenient tor most-installations.

Gas discharge tube iohas one end emptying intogreasecontaine'r2andtheotherendprojectingintothedmmleadlnlfromthe end-oigas'disclnrgetube 16. in orifice l'lissmallerinareathantheopeningin tube loatapointbelowtheoriflce. lsisabindingnuttoholdtubelsfirmlyinplaceinthe usual manner tor-the constniction shown.

when the pumpis operated liquidis pumped out of container 2 up-and outthrough discharge 'pumptothemeter. 17isanorific'eattheinlet passage 8. When the level of the liquid in. container 2 is so low that air or other gases can pass in through foot valve 12, a mixture of liquid and gases is pumped. Meter 9 requires some pressure to operate it so that the pressure in discharge opening 19 isslightly greater than the pressure in discharge tube 10 leading from the meter. There is, of course, practically no pressure above atmospheric pressure within container 2, as container 2-and container cover-3 do not enclose the supply of liquid so tightly as to exclude theadmittance of air from outside the container. The pressure at the lower end of gas discharge tube 16 is, therefore, practically atmospheric only and, therefore, somewhat lower than the pressure at delivery opening 19. This causes a flow of liquid downward through tube 16 at all times. As the inside of tube 16 is considerably larger than the opening in orifice 1'1, the liquid, which enters through the orifice does not completely fill tube 16, but runs down one side of it. Tube 16 below the orifice is, therefore, filled partly with liquid and partly with air. Because of the air within the tube, the pressure within the tube just below orifice 17 is practically the same as the pressure at the lower end of tube 16. It orifice 17 were omitted, the tube would be filled practically solid with liquid when grease is measured, with the result that the pressure at the upper end of tube 16 would be much higher than in the construction provided for by my invention.

When a small quantity of air passes up through the pump and reaches orifice 1'! it can readily pass down through the orifice rather than into meter 9 because of this difference in pressure.

In my experiments I have found that there are certain limits to the length of the opening of orifice 17 in proportion to the width of the opening, this proportion being covered in the claims. It can readily be seen that ii the restricted neck at the upper end of the tube or the orifice, is too long that the advantage in the diflerence of pressure, which controls the flow of the air, will be overcome by the friction of the grease which enters the orifice together with the air, this grease forming a seal if the neck is too long.

The exact proportions of the opening in orifice 17, as compared with the area of tube 16, are controlled by the viscosity of the liquid to be handled. With a very thin liquid the necked opening or orifice at the upper end or the tube can approach in size the tube itself. For extremely viscous liquids a large tube must be used together with a smaller orifice to allow the proper movement of the contents of the tube.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A dispensing and measuring apparatus for viscous substances, such as grease, comprising 8 meter, 2. container for the grease, a pump havin its inlet below the level of grease in said container and its outlet connected to the meter, a dischar e line and a discharge nozzle, said pump, meter, discharge line and nozzle being mounted upon said container and connected together so that upon actuation of said pump grease will fiow from said container through said meter, discharge line and nozzle in succession, and a bypass having its outlet in said container above the levelof grease therein so as to be remote from the inlet to said pump and so that the grease within the container does not obstruct said outlet and having its inlet in the path of the grease between said pump and meter so that air entrained in the stream of grease will be returned to said container above the grease therein, said bypass having a restricted neck section near the bypass inlet, substantially as and for the purpose described.

2. A dispensing and measuring apparatus for viscous substances, such as grease, comprising a meter, a container for the grease, a pump having its inlet below the level of grease in said container and its outlet connected to the meter, a discharge line and a discharge nozzle, said pump, meter, discharge line and nozzle being mounted upon said container and connected together so that upon actuation of said pump grease will flow from said container through said meter, discharge line and nozzle in succession, and a bypass having its outlet in said container above the level of grease therein so as to be remote from the inlet to said pump and so that the grease within the container does not obstruct said outlet and having its inlet in the path of the grease between said pump and meter so that air entrained in the stream of grease will be returned to said container above the grease therein, said bypass having a restricted neck section near its upper end, substantially as and for the purpose described.

3. A dispensing and measuring apparatus for viscous substances, such as grease, comprising a meter, a container for the grease, a pump having its inlet below the level of grease in said container and its outlet connected to the meter, a discharge line and a discharge nozzle, said pump, meter, discharge line and nozzle being mounted upon said container and connected together so that upon actuation of said pump grease will flow from said container through said meter, discharge line and nozzle in succession, and a bypass having its outlet in said container and having its inlet in the path of the grease between said pump and meter so that air entrained in the stream of grease will be returned to said container above the grease therein, said bypass having a restricted neck section near the bypass inlet, substantially as and for the purpose described.

ROBERT s. BAssETr.

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