US1362858A - Pneumatic liquid-pump - Google Patents

Description

A. F. ENGLES AND 8.]. RAPP.

PNEUMATIC LIQUID PUMP.

APPLICATION FILED MAY 26, 1919.

Patented Dec. 21,1920.

UNITED STATES PATENT OFFICE.

ALBERT FRANCIS ENGLES AND CLARENCE JACOB RAIP, 0F AUBURN, NEBRASKA.

PNEUMATIC LIQUID-PUMP.

Specification 01' Letters Patent.

Patented Dec. 21, 1920.

T 0 all whom it may concern Be it known that we, ALBERT FRANCIS ENGLES and CLARENCE JAoon Barr, citizens of the United States, residing at Auburn, in the county of Nemaha and State of Nebraska, have invented certain new and useful Improvements in Pneumatic Liquid- ..Pumps; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention has for its principal object to provide an extremely simple yet highly eflicient pump for pumping water or other liquid by alternately compressing air into and exhausting it from a submerged casing. A cylinder and piston are provided for this purpose, connected to the casing by an air pipe, and another object is to make novel provision for allowing escape of compression from the cylinder and pipe before starting the vacuum or suction stroke of the piston, and for relieving the vacuum before the piston travels on its compression stroke, thus insuring that the full strokes of the piston shall be devoted to suction and compression respectively.

lVith the foregoing in view, the invention resides in the novel construction and arrangement of parts hereinafter described and claimed, reference being made to the accompanying drawing.

Figure 1 is a vertical section, partly in elevation, of a pump constructed in accord ance with our invention.

Fig. 2 is a diagram showing the piston on its suction stroke.

Fig. 3 illustrates in diagram the manner in which the vacuum is relieved when the piston reaches the end of its suction stroke.

Fig. 4 is a diagrammatic view showing" the piston on its compression stroke.

In the drawing above briefly described, we have shown the invention associated with a well 1 but it may be used in connection with bodies of liquid otherwise contained. A casing 2 is submerged in the liquid 3 and is provided with an inlet having an inwardly opening check valve 4, while an outlet pipe 5 leads from said casing and is provided with a downwardly closing check valve 6. The pipe 5 preferably extends through the top of the casing 2 and has its lower end positioned near the bottom of said casing, while the upper end of said pipe extends to any suitable location and may be provided with a discharge neck 7. A pump yet to be described is provided for alternately exhausting the air from the casing 2 and compressing air into said casing. When the air is exhausted, the casing fills with liquid through the check valve at and when compression takes place valve 4 closes and valve 6 opens, whereby the liquid is discharged from the pipe 5. When suction is next created in the casing 2, the valve 6 remains closed and traps a column of liquid in the pipe 5, while the casing is again filling.

A cylinder 8 is mounted at any suitable location and an air pipe 9 leads to the top of the casing 2 from a point 10 spaced from one end of said cylinder. A piston 11 operates within the cylinder 8 and on one stroke serves to compress air into the casing 2, while its other stroke exhausts the air from such casing. As the piston moves on its compression stroke as indicated in Fig. 4, air is forced from the cylinder 8 through the pipe 9, but whensaid piston nears the end of its stroke it travels over the end 10 of the pipe 9 and closes such end. It is then necessary that means other than the pipe 9 be provided for discharging the compressed air from the cylinder, and to obtain this result, we provide a branch 12 leading to said pipe 9 from the end of the cylinder. While the end of the pipe 9 is closed by the piston 11, the compressed air escapes from the cylinder through the branch 12 and travels into the casing 2. The compressed air thus entering the casing 2, discharges the liquid therefrom and when the piston 11 moves beyond and uncovers the end 10 of the pipe 9, the compression in said pipe and in the casin 2 is relieved, so that an equilibrium 0 pressure exists in the casing and cylinder. When now the piston starts on its return stroke, it exhausts air from the casing 2 through the pipe 9 and branch 12, thus allowing the casing 2 to again fill with liquid. The suction stroke of the piston is indicated in Fig. 2 and when said piston has reached the limit of said stroke as illustrated in Fig. 3, it uncovers an air inlet port 13, whereupon atmospheric air may enter the cylinder and the piping to relieve the vacuum in the entire system. The piston now travels on another compression stroke as seen in Fig. 4: and the operation above described is repeated.

Particular attention is directed to the location of the point 10 at which the pipeline 9 communicates with the cylinder 8, and to the provision of the branch 12, since without such an arrangement, the compression in the system would not be relieved before the suction stroke of the piston, and consequently the full stroke of said piston would not be devoted to exhausting air from the casing 2 and the pipe-line. The air inlet port 13 is also an important feature since without its use, the vacuum in the system would not be relieved prior to the compression stroke of the piston and consequently compressionwould not take place throughout the length of such stroke.

Any adequate means could be provided for operating the piston 11 but for illustrative purposes we have shown it connected by a piston rod 14 with-a cross-head 15 operated by a pitman 16 from a wrist pin 17. This wrist pin is shown carried by a wheel 18 which may be driven by any suitable means such as a belt 19.

From the foregoing, it will be seen that we have provided a pneumatic pump of 6X- treme simplicity, yet one which will be highly eflicient and in every way desirable.

Few moving parts are used and consequently' there is little danger of the apparatus becoming disabled as is often the case with machines of more complicated nature. Since probably the best results may be obtained from the general association of parts as shown, this arrangement may be followed, but within the scope of the invention as claimed, numerous minor changes may well be made.

We claim:

In a pneumatic liquid pump, a submerged casing having a liquid inlet and a liquid outlet each provided with a check valve, a cylinder, an air pipe leading to said cas' ing from said cylinder and communicating with the latter at a point spaced from one end thereof, a combined air compressing and air exhausting piston operating in said.

cylinder, said piston being movable across and beyond the end of said air pipe on its compression stroke, a branch from the aforesaid end of the cylinder into said pipe for conducting compressed air from the former while the end of said pipe is closed by the piston, and an air inlet into said cylinder opened by the piston at the end of its suction stroke for relieving the vacuum in the system.

In testimony whereof we have hereunto set our hands.

ALBERT FRANCISENGLES.

CLARENCE JACOB RAPP.

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