US1536632A - Pneumatic pump - Google Patents

Description

May 5, l 925.

VH.SROGERS PNEUMATIC PDM? Filed Feb. 20, 1922 3 @Ll y WM ATTORNEYS.

Patented May 5, 1925.

I'IOMER S. ROGERS, OF MILWAUKEE, WISCONSIN, It-SIGNOR TO MLVJAUKEE AIR POWER PUlVIlE` COMPANY, F IVIILWAKEE, WJKSOONSIN, A CORPORATION 0F WIS- CONSIN.

ENEUMATIC PUMP.

Application inea February 20,1922, seriai No. 537,807.

T 0 @ZZ @07mm t may concern.'

Be it Vknown that I, Heinen S. Roenes, a citizen of the United States, residing at j Milwaukee, in the county of Milwaukee and State o1' llliscoiisiii, have invented certain new and useful In'iprovements in Pneumatic Pumps, of which the following is alspeciiication, reference being had to the accompanying drawing, forming a part thereof. This invention relates to pneumatic pumps and the object of the invention is to iinprove thev construction and operation of pneumatic pumps in the manner to be here j inafter described and claimed. 4 VReferring to the drawing which accompanies this specification and forms a part hereof, the ligure of the drawing is a vertical section of a pneumatic pump.

Referring tothe drawing, the reference numeral 1` designates a pump chamber which is provided with a water inlet valve 2, a water outlet valve 3, an air admission `valve L1, and an air exhaust valve 5. The drawing illustrates the parts in the positions which they occupy when water is being forced from the pump chamber, by coinpressed air,` through the water discharge pipe 6. The air exhaust valve 5 is held against its vseat 7 by a spring 8 which is sulliciently powerful to hold the air exhaust valve 5closed against any air pressure to be `used in the pump chamber 1. A belli `crank lever 9 is pivoted to the head 10 of the pump by a pivot 11 andone of its arms is pivoted to the air exhaust valve v5 while its other arm is pivoted to the stem 12 which projects from the plunger 13, as clearly shown bythe drawing. The stem 12 may be positioned and guided by aweb `11 and a recess `15 in a head or cap 16. The spring 8 is illustratedby the `drawing as a spiral spring ofthe open, orcompression, type surrounding the stem 12 and bearing at one end against the web 141 and at its other end against the -plunger 13 and exerting sufficient pressure to keep the air exhaust valve 5` closed against thev pressure of the air `in the pump chamber 1. The spring 8 is compressed to the requisite degreeof ten sion when itis assembled with the parts `of the pump with which `it coacts and its expansion is limited by the air exhaust valve seating against its seat 7. The spring 8 can be compressed, .and the air exhaust valve 5 opened, by a fluid-pressure motor 17, which is illustrated by the `drawing as compris? ing a diaphragm 18 and a head 19, between which is a fluid chamber 20, when the water level iii the pump chamber 1 has been lowered to a predetermined level.

It should be particularly noted that the plunger 13 does not encounter any obstacle to its continued movement under the influence of the spring 8 towards the right, looking at the drawing, so that the air exhaust valve 5 will be firmly seated even though wear takes place or the valve facing 21 swellsor shrinks under different conditions. vThe fluid chamber 2O can be placedin communication with the lower part of the pump chamber 1 by avalve 22 which can close or open the lower end of a pipe 23 which communicates with the fluid chamber 20. The valve 22 is carried by a valve lever 2li which is pivoted by a pivot 25 to the lower end of the pipe 23.V A float 26 is arranged as a low level float and has a stem 27 projecting through a hole in a guide 28 and another stem 29 projecting through a hole in the valve lever 211. rl`he stein 29 has a head 30 below the valve lever 2a so as to close the valve 22 as the `of the spring 8 is sulhcient to keep the air exhaust valve 5 closed, as will be readily iinderstood from the well-knownprinciples of the pressures of fluids upon surfaces or areas differing in size.

projecting downwardly through a guide 33. Toggle-joint members `34 and 35 are piv-` oted together by a pivot 36 and the member `311is pivoted to the stem 32 of the air exhaust valve 5 by a pivot 37, while the inem` ber 35 is pivoted to a projection 38 by ,aV

pivot 39. The projection 38 is illustrated by the drawing as formed integrally with the head 10 of the pump but this specific construction is immaterial as the only ob-` ject sought is to support the pivot 39 firmly substantially under the pivot 37. rllhe construction forms a toggleqoint which will hold the air exhaust valve 5 open when the The air exhaust valve 5 y is illustrated as provided with a stem 32 pivot 36 is moved into a substantially straight line with the pivots 37 and 39. 1t is preferred that the pivots 36, 37 and 39 lit a little loosely so that, when the air exhaust valve is lifted, the spring 40 can swine' the pivot 36 slightly beyond a line through the pivots 37 and 39 against a stop and thus hold the air exhaust valve 5 open. The stop illustrated by the drawing is the stem 41 which projects from a head 42 which rests against a part of the head of the pump but can be forced away therefrom by any suitable motor mechanism, as for example, the diaphragm 43 of a fluid pressure motor 44. rl`his fluid pressure motor 44 is provided with a tluid chamber 45 to which compressed air can be admitted from a duct 46 by an air valve 47 and from which the compressed air can be exhausted through an exhaust port 43 which is controlled by the exhaust valve 49. For simplicity of construction the air valve 47 and the exhaust valve 49 may be formed on a member 50 which is provided with a stem 51 connectedL to a lever 52. The lever 52 is pivoted by a pivot 53 to the stem 51, and by a pivot 54 to the head 1() of the pump, and by a pivot 55 to a weight-float 56. The weight-float 56 should be heavy enough to keep the air valve 47 closed against the pressure of the compressed air in the duct 46, taking into account the leverage exerted by the lever 52, when the water level in the pump chamber 1 is not high enough to buoy up the oat 56, and, at the same time, the float 56 should be light enough so that when it is buoyed up by the water the air valve 47 will be opened and at the same time the exhaust valve 49 will be closed so that the pressure of the compressed air in the Yluid chamber 45 will bulge the diaphragm 43 and move the head 42 and stem to push the pivot 36 of the toggle-joint members 34 and 35 beyond a line through the pivots 37 and 39 so that the spring- 8 can close the air exhaust valve 5. A. light spring 57 tends to seat the air admission valve 4 and the air admission valve 4 is opened by the spring 8 when the toggle-joint members 34 and 35 contact with the valve stem 58.

The compressed air is conducted from any suitable source of supply by the pipe 59 to the air chamber 60 with which the duct 46 communicates. The reference numeral 61 designates an air exhaust pipe through whichV the exhaust air may be conducted from the exhaust chamber 62 to a point above the surface of the water in which the pump is submerged.

The operation of the pump is as follows. Referring to the drawing, the air exhaustvalve 5 is closed and is being held closed by the spring 8. The air admission valve 4 is open and is being held open by the spring 8 and the toggle-joint members 34 and 35. rl`he air valve 47 is closed and the exhaust valve 49 is open and these two valves are being maintain-ed in the positions shown by the drawing by the weight of the weight-float 56. The water inlet valve 2 is closed and is held closed by its weight and by the pressure exerted upon it within the pump chamber 1. The valve 22 is closed and is held closed by the float 26 and the pressure in the pump chamber 1. rlhe pressure of the compressed air on the surface of the water in the pump chamber 1 is forcing the water out through the water discharge pipe 6 and the outitlowing water is keeping the water outlet valve 3 open. The several parts occupy the positions shown by the drawing until the water level in the pump chamber 1 has been lowered to the. line of flotation of the float 26. lilith a further lowering of the water level, the Hoat 26 will descend with the lowering water level until the further descent of the float 26 is arrested by the tioat contacting with the valve lever 24, which is held in its valve closed position on account of the pressure in the pump chamber l being higher than the pressure in the pipe 23. As the water level continues to lower, more and more of the float 26 will be left out of water until the weight of the float 26 acting on the valve lever 24 is sutlicient to overcome the pressure holding the valve 22 closed. rEhe weight of the float 26 will then open the valve 22 suddenly and water will be forced through the pipe 23 into the fluid chamber 2O of the motor 17 and will force the diaphragm 18, the plunger 13, and the stem 12 to the left, compressing spring 8, rocking the bell-crank lever 9, opening the air exhaust valve 5, and bringing the pivot 36 into line with the pivots 37 and The spring 40 will swing the toggleljoint members 34 and 35 over against the stem 41 with the pivot 36 at the right of a line through the pivots 37 and 39. The air admission valve 4 will close, the air pressure in the pump chamber 1 will be reduced by the exhaust of air therefrom, the water outlet valve 3 will close and the wa ter inlet valve 2 will be opened by the hydraulic pressure outside the pump chamber and water will flow into the pump chamber to refill the same. As waterl reiills the pump chamber, the float 26 will be elevated, lifting the valve lever 24 and closing the valve 22. Willen the water level has risen in the pump chamber sui'iiciently to submerge enough of the high level float 56 to rock the lever 52, the air valve 47 will be opened and the exhaust valve 49 will be closed, and the pressure of the compressed air in the fluid chamber 45 will bulge the diaphragm 43 and force the head 42 and the stem 41 to the left far enough to move the pivot 36 to the left of a` line through expand and move theplunger 13 and stem 12 tothe right, rocking the bell-crank lever 9,closing the air exhaust valve and swingingthe pivot 36 far enough to the left to open the air admission valve 4. The air pressure is now on the pump and the water inlet valve 2 will close, if it happens to be open, and the water willV open the water foutlet valve 3 and be discharged through the water discharge pipe 6, as already described. "When the water level in the pump chamber has lowered sufliciently the weightfloat 56 will descend closing the air valve 47 and opening the exhaust valve 49 so that the air pressure in the fluid chamber will be reduced when the air exhaust valve 5 is again opened.

The valve lever 24 is provided with a lip 623 to contact with a stop 64 to limit fifi the downward movement of the valve lever 24 and the valve 22 carried thereby.

A bleed hole 65 is provided at the upper part of the fluid chamber 2() to allow air which may separate from the water toescape and some water may also escape through this bleed hole, the only point to be observed being that the bleed hole should notv` be so large as compared with the area of the pipe 23 as to materially reduce the pressure in the fluid chamber 20 prior to the full opening of the air exhaust valve 5. To facilitate the exhaust of the water from the fluid chamber 2O two or more openings GG and 67 may afford communication with the pipe 28. The stem 12 is intended to lit rather nicely in the bore 68 of the web 14 through vwhich it passes to prevent the pressure of the air at the instant of exhaust from exerting a back pressure upon the diaphragm 18 and to avoid any interference with the freedom offmovement of the diaphragm 1S, one or more holes 69, ofsuiiicient size to permit free movement of water therethrough, may be provided to afford communication between the chamber 70 ,and the water in which the pump is submerged.

It will be observed that, with the parts in the positions shown by the drawing, the pressures upon opposite sides of the diaphragm l43 are equal and that the compressed air is exhausted from the fluid chamber `45 of the fluid pressure motor 44 at the same time that the compressed air is exhausted from the pump chamber 1.

llllhat is claimed is:

1. In a pneumatic pump, the combination with a pump chamber provided with water inlet and outlet valves, an air admission valve and 'an air exhaust port, of an air exhaust valve located outside of said pump chamber to control said air exhaust port, means for keeping said air exhaust valve closed against the pressure in said pump chamber, and a motor for opening said air exhaust valve.

2. ln a pneumatic pump, the combination with a pump chamber provided with water inlet and outlet valves, an air admission valve and an air exhaust Jort, of an air exhaust valve located outside of' said pump chamber to control said air exhaust port, a spring for keepingsaid air exhaust valve closed against the pressure in said pump chamber, and a fluid pressure motor for compressing said spring' and openingsaid air exhaust valve. i

In a pneumatic pump, the combination with a pump chamber provided with water inlet and outlet valves, an air admission valve and an air exhaust port, of an air exhaust valve located outside of said pump chamber to control said air exhaust port, a spring for keeping said air exhaust valve closed against the pressure in said pump chamber, toggle-joint members for holding said air exhaust valve open, and fluid pressure motors for compressing said spring and moving said toggle-joint members. i

4. In a pneumatic pump, the combination with a pump chamber provided with water inlet and outlet valves, an air admission valve and an air exhaust port, of an air exhaust valve located outside or' said pump chamber to control said air exhaust port, means for holding said air exhaust valve closed against the pressure in said pump chamber, and means to actuate said air exhaust valve and said air admission valve according to predetermined water levels in said pump chamber.

5. ln a pneumatic pump, the combination with a pump chamber provided with water inlet and outlet valves, an air admission valve and an air exhaust port, of an air exhaust valve located outside of' said pump chamber to control said air exhaust port, a bell-crank lever connected tothe air exhaust valve and a stem, a spring for keeping said air exhaust valve closed against the pressure in the pump chamber, Aa fluid pressure motor for opening-the air exhaust valve, a float in the pump chamber controlling the operation of' said fluid pressure motor when the water in the pump chamber has been lowered to a predetermined level, toggle-joint members connected with the air exhaust valve for holding it open, a second fluid pressure motor for moving said togglejoint members when the water level in the pump chamber has risen to a` predetermined level to permit the air exhaust valve to be closed and to open the air admission valve.

6. ln a pneumatic pump of the class described, a pump chamber, water inlet and outlet valves, air inlet `and outlet valves, a fluid pressure motor connected to said air exhaust valve for operating the latter, means associated with said air exhaust valve for unseating said air inlet valve upon each seating operation of the former, and independent means for seating said air admission valve.

7. In a pneumatic pump of the class described, a pump chamber, Water inlet and outlet valves, air inlet and outlet valves, a iuid pressure motor connected to said air exhaust valve for operating the latter, a stem carried by said air exhaust valve, and toggle joint members attached to said stem at one end and to a fixed pivot at the other, said air inlet valve being also provided with a stem, the latter being disposed for engagement and operation by said toggle members when said air exhaust valve is operated in one direction.

8. In a pneumatic pump ot the class described, a pump chamber, Water inlet and outlet valves, air inlet and outlet valves, a iuid pressure motor connected to said air exhaust valve for operating the latter, a stem carried by said air exhaust valve, toggle joint members attached to said stem at one end and to a fixed pivot at the other, said air inlet valve being also provided with a stem, the latter being disposed tor engagement and operation by said toggle members when said air exhaust valve is operated in one direction, said toggle members being moved out ot' engagement with said stem upon operation of said air exhaust valve in the opposite direction, and means tor operating said air inlet valve in the reverse direction upon such disengagement.

9. In a pneumatic pump of the class de`- scribed, a pump chamber, Water inlet and outlet valves, air inlet and outlet valves, a fluid pressure motor connected to said air exhaust valve for operating the latter, a stem carried by said air exhaust valve, toggle joint members attached to said stem at onel end and to a fixed pivot at the other,

said air inlet valve being also provided with a stem, the latter being disposed 'for engagement and operation by said toggle members when said air exhaust valve is operated in one direction, means for operating said air inlet valve in the reverse direction upon such disengagement, and a second lluid motor for insuring breaking of the toggle joint in the proper direction upon each operation of said air exhaust valve in the direction first-named.

10. The combination with a pneumatic pump of the class described having air inlet and exhaust valves, ot a toggle jointed element attached to one of said valves and adapted to engage and operate the other upon a breaking ot' the oint in o-ne direction, and means for operating the valve to which said element is attached.

ll. rIhe combination with a pneumatic pump ot the class described having air inlet and exhaust valves, of a toggle jointed elcment attached to one of said valves and adapted to engage and operate the other upon a breaking of the joint in one direction, means lier operating the valve to which said element is attached, and means cooperating with saidelement for insuring proper breal-:ing ot said joint upon operation of said valve.

12. In a pneumatic pump ot the class described, a pump chamber, water inlet and outlet valves, air inlet and outlet valves, a fluid pressure motor connected to said air exhaust valve for operating the latter, and a toggle jointed element associated with said air exhaust valve and adapted when the joint is broken in one direction to engage and operate said air inlet valve.

In Witness whereof I hereto ailix my signature.

nonna s. Rooms.

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