US876849A

US876849A - Pump operated by compressed air.

Info

Publication number: US876849A
Application number: US36780307A
Authority: US
Inventors: Danvill W Starrett
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-04-12
Filing date: 1907-04-12
Publication date: 1908-01-14
Anticipated expiration: 1925-01-14

Description

PATENTED JAN. 14, 1908.

2 SHEETSSHEET 1.

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DANVILL W. STARRETT, OF SAN FRANCISCO, CALIFORNIA.

PUMP OPERATED BY COMPRESSED AIR.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed April 27. 1904:. Serial No. 205.128. Renewed April 12. 1907. Serial No. 367.803.

To all whom it may concern:

Be it known that I, DANVILL W. STARRETT, a citizen of the United States, residing at San Francisco, inthe county of San Francisco and State of California, have invented certain new and useful Improvements in Pumps 0 erated by Compressed Air, of which the fo lowing is a specification.

My invention relates to improvements in pumps operated by compressed air, the object of my invention being to provide a simple form of pump operated by compressed air by means of which water may be elevated to any height by means of compressed air at any pressure greater than the atmosphere.

My invention belongs to that class described and claimed by me in United States Letters Patent granted to me May 29th, 1906, No. 821,677 in which there is provided in the water discharge pipe a check valve, and to said discharge pipe above the check valve there leads a branch from the compressed air pipe, in which branch the opening is sufficiently large, having regard to the height of the discharge pipe and the pressure of the compressed air, to admit a sufficiently large proportion of air to water to distribute the water through the whole length of the pipe to such an extent that the weight of the entire amount of water shall not overbalance the pressure of the compressed air;' whereby when water escapes from the top of the discharge pipe the pressure of the compressed air may be utilized to force water through the check valve into the discharge pipe to supply the place of that which has been discharged from the top thereof.

This invention consists of -a simple construction for effecting the above results.

An especial object of my present invention is to provide such a construction by means of which the air after being utilized to force water through the check valve may be introducedinto the water discharge pipe to assist in lifting the water.

i In the accompanying drawings, Figure 1 is a vertical section of the apparatus, certain'of the pipes however being shown in side elevation; Fig. 2 is a side elevation of the upper portion of the apparatus; Fig. 3 is a horizontal section on the line A--A of Fig. 1; Figs. 4 and 5 are views similar to Figs. 1 and 2 of a modified form. of the apparatus; Fig. 6 is a vertical section of the reducing valve.

Referring to the drawing, 1 represents the compressed air pipe, 2 the water discharge pipe and. 3 the water suction pipe.

4 represents a common steam pump comprising a steam cylinder 5 and a pumping cylinder 6. In the present instance the steam pump is preferably operated by means of compressed air. The

piston

7 and 8 in these cylinders are of substantially the same diam eter and are connected by a piston rod 9.

10 is the valve chamber having the valve 11 therein operated from the piston rod 9 by the lever 12, links 13 and rod 14;.

15 represents a chamber divided into upper and lower portions by a horizontal partition 16, the lower portion being again divided by a vertical partltion 17 into

compartments

18 and 19, connected respectively with the upper and lower ends of the pumping cylinder. These compartments contain

inlet valves

20, 21. The upper portion or compartment 22 contains

check valves

23, 24, communicating respectively with the compartments 18 19.

25 represents a branch or jet pipe leading from the compressed air pipe to the water discharge pipe and having therein anadjustable check valve 26. Beyond saidcheck valve there is provided a nozzle 27 which'discharges the compressed air into said branch pipe 25 opposite to the entrance of an exhaust pipe 28 leading from the exhaust chamber 29 of the pump and'having therein a pet-cock 30 The operation of the apparatus is as follows. Supposing the parts to be in the position shown in Fig. 1, the air entering the upper portion of the-cylinder 51forces the piston 7 downwards, likewise forcing down the piston 8 and drawing water from the pipe 3 through the valve 20 into the chamber 18 and thence to the upper end of the pumping cylinder 6. Upon the returnstroke of the pistoncaused by the admission of compressed air to the lower end of the cylinder 5, the water in the upper portion of the pumping cylinder is forced back into the compartment 18, and thence through the valve 23 into the compartment 22. At the same time water is being drawn through the valve 21 into the compartment 19 and thence into the lower end of the pumping cylinder, which, again. on the return stroke of the piston, is forced through thevalve 24 into the chamber 22. During the whole of this operation compressed air is also passing through the branch pipe 25 into the water discharge pipe, and it is only when the amount of air so forced through said branch or jet pipe is sufiicient to distribute the water along the discharge pipe to such an extent that the pressure of the whole of the water therein upon the

valves

23, 24 is less than the pressure of the compressed air, that any Water passes through As soon as water is discharged of the continuedflow of the compressed air into the bottom of said discharge pipe, then immediately the pump begins to work and water is forced through the

valves

23, 24,

into the discharge pipe to supply the place of the water that had been discharged frointhe top of said pipe. The exhaust air of the pump after performing its ofiice of driving the piston is permitted to'flow into the water discharge pipe 2, and it is in order to avoid any back pressure that the nozzle 27 is provided, since it assists the passage of the air from the exhaust chamber to said water dis charge pipe. By this means the air of the pump is utilized to lift the water in'the water discharge pipe.

Figs. 4, 5 and 6 show a modification in which the piston of the steam cylinder is of greater area than that of the pumping cylinder. In this case therefore it is necessary to reduce the pressure of the air supply to the steam cylinder. Thisis done by means of the throttle valve 31, shown in detail in Fig. 6. It'would be possible to, make the piston of the steam cylinder of less area than that ofthe pumping cylinder in like manner except that in this case the throttle valve should be placed in the branch pipe leading from the compressed air pipe to the water discharge pipe.

The pet-cock 30' can be used to reduce the pressure very low, if desired, when economy is-not of the first importance.

I do not claim herein matter claimed by me in a copending application Serial N 0.

367,071, filed April 8th, 1907, confining my- Self in the present application to the specific claims here made.

I claim 1. In an apparatus ofthe character described, the combination of the compressed air pipe, the water discharge pipe, the inlet valve for the water, the check valve therefor at the bottom of said water discharge pipe, a

pump discharging into the space between the inlet and check valves and having a piston operated by the compressed air, a passage from the compressed air pipe to the water discharge pipe sufficiently large in relation to v the compressed air pressure and the height of the discharge pipe to distribute the water therein sufficiently to reduce the weight of from the compressed air the water upon the check valve below the compressed air pressure whereby said pressure can operate to pump water through said check valve, and an exhaust pipe leading to said passage from the exhaust chamber of the pump, substantially as described.

'2. In an apparatus of thecharacter described, the combination of the compressed air pipe, the water discharge pipe, the inlet valve for the water, the check valve therefor at the bottom of said water discharge pipe, a pump'discharging into the space between the inlet and check valves and having a piston operated by the compressd air, a passage ipe to the water discharge pipe sufficiently arge in relation. to

the compressed air pressure and the height.

the air along said exhaust pipe, substantially as described.

3. In an ap paratus of the character described, the combination of a com ressed air pipe, a water discharge pipe, an in et'valve, a check valve at the bottom of the water discharge pipe, and a pair. of cylinders having pistons't erein of unequal. diameters, said pistons being connected. to work in unison,

one of said cylinders being connectedwith the and the compressed air pressure to distribute the water in said discharge pipe sufficiently to reduce theweight of the water upon the check valve below the compressed air pressure, whereby said pressure can operate said pistons to force water through said check valves, substantially as described.

In witness whereof I have hereunto set my hand in the presence of two subscribing witnesses' DANVILL W STARRETT Witnesses:

"FRANCIS W. WRIGHT,-

BESSIE GORFINKEL.