US2365234A - Pump mechanism - Google Patents

Description

Dec. 19, 1944.

w. H. WINEMAN 2,365,234

PUMP MECHANISM Original Filed Spt. 17, 1940 Hg. 1. g 4 3 I x v ""lini W W II m 3/ 23 24 g? '||I|., 33 31 u /9 26 32 34 I I I 29 24 39 Invenior: ZdadeHZdhwmafl. Z 20 y Patented Dec. 19, 1944 PUMP MECHANISM Wade H. Wineman, Michigan City, Ind., assignor to Sullivan Machinery Company, a corporation of Massachusetts Jriginal application September 17, 1940, Serial No. 357,155. Divided and this application December 23, 1942, Serial No. 469,865

2 Claims. (01. 103-9) This invention relates to pump mechanisms, and more particularly to pump mechanisms adapted to supply simultaneously fluids of different types under pressure to a common system.

It is sometimes necessary to supply both gaseous and liquid fluids to a common system. A yieldable supporting structure in which a recessed piston is urged in one direction in a cylinder by gaseous fluid under pressure and is sealed at its pressure end by a liquid, is one example of a system to which both liquid and gaseous fluids must be supplied. In such a system, the pressures on the liquid may cause the latter to work its way between the walls of the cylinder and piston and escape. If the seal is broken by the escape of the liquid or by a movement of the piston end out of the liquid, then the gaseous fluid may escape. To restore the pressure conditions Within the cylinder and to efiect a sealing of the piston end, it is necessary that both liquid and gaseous fluids be pumped into the cylinder. A pump mechanism similar to that of my invention may be used to pump the fluids back into the system.

This pump mechanism may desirably comprise a cylinder block having stepped bores which receive stepped portions of a piston. Opening into the stepped bores are separate intake passages controlled by inlet valves. One of these passages is adapted to supply a liquid to its connected bore, and the other is adapted to supply a gaseous fluid. The bores are connected in communication with each other by a passage which is controlled by a one-way valve, and the bore to which fluid flows from the other bore, is connected to a valve controlled discharge passage. By supplying liquid, as contemplated in my invention, to the bore from which fluid is pumped to the other bore, it will be seen that a lubrication of each of the pistons will be obtained, the piston and cylinder portions of the gaseous fluid pump will be cooled by the liquid, and the liquid serves in the second bore to eliminate all of the piston and valve clearance, thus assuring practically complete delivery of gaseous fluid to the system. It will be understood, of course, that the parts of the pump mechanism may be arranged in different ways and still effect the same result.

An object of this invention is to provide an improved pump mechanism. Another object is to provid ar improved pump mechanism adapted to deliver difierent fluids simultaneously to a common system. Still another object is to provide an improved liquid and gaseous fluid pump in which the liquid is pumped through the gaseous fluid pump portion to a discharge line. Yet another object is to provide an improved pump mechanism having a plurality of bores, and pistons making intake and discharge strokes simultaneously in said bores for pumping a liquid and a gaseous fluid to a common discharge line, the liquid being pumped through the gaseous fluid pump portion so as to eliminate clearances in the latter, and to cool and lubricate its parts. Other objects of the invention will appear in the course of the following description. This application is a division of my copending application Serial No. 357,155, filed September 1'7, 1940.

Ther is shown in the drawing one form which the invention may assume in practice.

In this drawing:

Fig. 1 is a vertical sectional view of a supporting structure with which the improved pump mechanism is adapted for use, the pump mechanism being shown in side elevation.

Fig. 2 is anenlarged vertical sectional view of the pump mechanism shown in Fig. 1.

In the illustrative embodiment of the invention there is shown a "beam type pumping apparatus, generally designated I, including a yieldable supporting structure 2, a walking beam 3, and the improved pump mechanism 4.

The supporting structure 2 includes a cylinder 6 supported in a vertical position by legs 8 and receiving in its bore 9 a sleevelike piston Ill closed at its upper end. Th walking beam 3 is pivotally attached, at H, to the upper end of the piston, and is adapted to be driven by any suitable means not shown. The cylinder bore 9 is closed at its lower end by a wall 12 and is partially filled with a liquid for sealing air under pressure within the upper portion of the sleevelike piston. Any liquid or air escaping between the walls of the piston and the cylinder enters an annular groove I 4 formed in the walls of the cylinder bore at its upper end and is conducted through a. conduit It: to a tank I6. Air escaping to the tank It is vented from the latter through a vent port l8. The improved pump mechanism 4 operates to pump liquid from the tank through a flexible conduit l9, and to pump air taken from the atmosphere through a filter 20, back into the cylinder bore through a conduit 2| extending to the bottom of the piston. It will be understood that the yielding supporting structure is merely illustrative of 'a device with which the improved pump mechanism is adapted for use.

Referring to the improved pump mechanism 4, it will be noted that a cylinder block 23 is attached, as by bolts 2!, to a portion formed on and extending transversely from the upper end of the piston l0. Formed in the cylinder block are stepped bores 25 and 26 opening into each other. and the larger bore 25 opens through the top of the cylinder block. A piston 21 having portions 28 and 23 receivable, respectively in the bores 25 and 26 is connected by a link 30 to the walking beam 3 to be driven thereby. The displacement of the piston portion 26 in the larger bore is smaller than the displacement of the piston portion 29 in the smaller bore. The conduit 13 opens into a passage 32 controlled by a ball valve 33 and opening into the lower end of the bore 25. A passage 34 in the cylinder block connects the lower ends of the cylinder bores 25 and 26 and is controlled by a spring seated ball valve 36. A passage 31 opening into the lower end of the cylinder bore 26 is connected to the air filter 20 under the control of a ball valve 38 and to the conduit 2| under the control of a ball valve 39.

As the walking beam is rocked on its pivot II, the link 30 causes the piston 21 to be reciprocated. A reciprocation of the piston portion 28 within the bore 25 causes liquid to be pumped from the tank [6 through the conduit 59 and through the passage 34 to the bore 26. If all the liquid is pumped from the tank, then air entering the tank through the vent port 1 8 will be pumped by the piston portion 26 to the bore 26. During the suction strokes of the piston 21, air will be taken through the filter 26 past the valve 38 into the bore 26. No liquid will be taken into the bore 26 during the suction stroke of the piston since the valve 36 will be held seated by its spring as well as by the suction produced by the piston portion 28. During the compression stroke of the piston, the air in bore 26 as well as the liquid or air delivered to the bore 26 from the bore 25, will be pumped to the conduit 2|. If the pressure within the sleeve-like piston l increases to a point where it raises the lower end of the piston above the level of the liquid, then the air is permitted to escape through a conduit 40 to the groove I4 where it enters the conduit l and is conducted to the tank l6 to be vented through the port l8. Any liquid carried from the cylinder with the air will drop into the tank I 6 and be pumped back into the cylinder 6.

As a result of this invention there is provided an improved pump adapted to deliver a liquid and a gaseous fluid simultaneously to a common system. It will be noted that the pump is extremely compact. By reason of the discharge of the liquid through the gaseous fluid pump portion, a complete discharge of the gaseous fluid from the pump is assured, and high pressures in the system may be maintained with only one stage of compression. It will further be noted that eiTective cooling and lubrication of the pump are obtained. Other advantages will be apparent to those skilled in the art.

While there is shown in this application one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes or illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a combined liquid and gaseous fluid pump, in combination, a cylinder block having stepped bores therein, a piston having portions fitting each of said bores, a valve controlled supply passage opening into the larger of said stepped bores adjacent the junction of said bores, a valve controlled supply passage opening into the smaller of said stepped bores at its end opposite the junction of said bores, the first of said supply passages adapted to communicate with a liquid supply chamber and the second one of said supply passages adapted to communicate with a source of gaseous fluid, a, valve controlled passage for connecting said bores in communication with each other and having associated therewith means permitting flow only from the larger to the smaller bore, and a valve controlled terminal discharge passage for said pump opening only into the smaller of said bores.

2. In a pump, in combination, a cylinder block having stepped bores therein, a piston having.

portions fitting each of said bores, the displacement of the piston in the larger bore'being smaller than the displacement of the piston in the smaller bore, valve controlled supply passages opening into said bores, a valve controlled passage connecting said bores and permitting the discharge of fluid from the larger bore to the smaller bore while precluding reverse flow, and a valve controlled terminal discharge passage for said pump connected only with said smaller bore.

WADE H. WINEMAN.

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