US1591388A - Pump - Google Patents

Description

. July 6, 1926. 1,591,388

I. C; JENNINGS PUMP " Filed July 2, 1921 2 Sheets-Sheet 1 ATioRNEYs.

'4 4? j INVENTOR- 'July 6 ,;1926.

l. C. JENNINGS PUMP Filed July 2; 1921 2 Sheets-Sheet 2 Patented July 6, 1926.

1 UNITED STATES I 1,591,388 PATENT ounce.-

IRVING C. JENNINGS, OF SOUTH NORWALK, CONNECTICI JT, ASSIGNOR TO NASH EN- GINEEBING COMPANY, OF. SOUTH NORWALK, CONNECTICUT, A CORPORATION.OF

CONNECTICUT.

Application .filed July 2,

The present invention relates to pumping apparatus and particularly to liquid pumps having rotary pistons.

He'retofore rotary pumps have not been used generally to pump liquidsin cases where'the liquid to be pumped is at a lower level than the pump itself because of'the difficulty in priming the pump upon starting to remove all air and gas from the intake, which when present .in only small amounts prevents the successful operation of the pump. Where such pumps are located below the tank or receptacle containing the liquid to be pumped they are automatically primed by liquid which flows downwardly from the tank and into the intake of the pump; It is very frequently desired however to install a rotary pump above the tank or receptacle in which the liquid is held and in accordance with the present invention a pumping apparatus is provided in which a rotary piston pump is used to im peel the liquid and an auxiliary means is provided for automatically priming the rotary liquid pump whenever it is' called into operation, so that the pump may be placed above the tank or receptacle containing the liquid to be pumped and will operate efiiciently and satisfactorily in such position. The priming device, which is preferably an air pump for exhausting theair or gas in the inlet conduit of the liquid pump, is also preferably connected to the driving means for the liquid pump so that whenever the last mentioned pump is called into opera-- tion it will be automatically primed and will operate romptly and without waste of power. nce in operation continuous action of the liquid pump is assured by the continuous operation of the primer which prevents any gathering of air in the intake to the pump.

One form of the invention is illustrated in the accompanying, drawings but it will be understood that the invention may be embodied in various forms of which that illustrated is an example. In the drawings:

Fig. 1 illustrates diagrammatically the pumping apparatus; and

Fig. 2 is a longitudinal. section through the rotary pump with its associated priming apparatus.

The numeral 10 indicates a tank or receptacle such as a sump or hot well and the PUMP.

1921. Serial No. 482,179.

numeral 11 indicates a second tank into which the water pumped may be discharged. The conduit through which the water is pumped includes a pipe 12 having its lower end or intake protected by screen 13 and submerged in tank 10, and a pipe 14 the uptions in gas pumps, described and illustrated in patents to L. H. Nash, Numbers 953,222

and 1,091,529 and to I'. C. Jennings, 1,297,- 692, respectively. As shown clearly in-Fig- 'ure 2, this air pump has a rotary impeller or piston 18', which is mounted upon the same shaft 19 which supports piston 15 of the water pump, this shaft being driven by the electric motor 20 so that both gas and liquid pumps are simultaneously operated. The intake pipe 21 of the air pump communicates with the interior of the separating chamber 16 through a restricted orifice 22 which, while offering but slight resistance to the passage of air to the pump, offers a substantial resistance to the passage of liquid.

The outlet conduit from the air pump is indicated at 23 and this outlet opens into the top of a separating tank 24 from which the air escapes through a pipe 25, the tank retaining any water which may flow from the air pump. The bottom of the separating tank 24 communicates with the interior of the air pump by means of a pipe 26, and an overflow 27 leading back to the tank 10 serves to carry off any excess water which may happen to be drawn through the re 'stricted'orifice 22 and the pipe 21 into the air pump and thence to the separating tank 24. The water in the separating tank 24 normally stands with its level at the height of the upper end of overflow pipe 27 which level is higher than the point where pipe 26 enters the air pump, so that a primin charge normally tends to flow from the tan to this pump at all times.

per end of which opens into tank 11. The

' and primes the inlet of the ,liquid pump.

ping the motor.

The motor 20 is preferably started and stopped automatically, having a main line switch 30 adapted to be opened and closed by a circuit closing switch 31 which is in turn controlled bya float 32. Float 32 moves vertically on a rod- 33 connectedto switch arm 31' and stops 34 are secured to this rod, one stop being "at the lower end of the rod near the bottom of the tank 10 and the second stop being near the top of the tank. As the tank fills, float 32 will strike the upper stop 34, close switch 31 and operate main line switch. 30 to start the motor. The air pump exhausts the air from the separating chamber 16 so that water islifted by suction through intake tube .12

Water entering the inlet of this pump d18- places the air contained therein and the pump is enabled thereby to exercise a lifting force on the column of-water and to force it throng pipe 14 and into the elevated tank 11 or'to a y other place to which it is to be pumped.

vents a back flow of liquid through the pump when the pump is not in operati011 and also prevents air from being drawn downwardly and through the pump into the separating chamber 16 when the pump is first started. As the tank 10 empties float 32 descends and finally contacts with the lower stop 34, opening switch31 and stop The apparatus will then be inactive until the tank again fills, when this cycle of operations will be repeated.

Having thus described the invention what is claimed as new and desired to be secured tarv liquid pump having a gas and liquid separating chamber at its intake side, aropassage for gas is provided, but little liquid can flow therethru, and means constantly supplying said gas pump with the liquid necessary for its operation.

2. Pumping apparatus of the character described including in combination, a rotary liquid pump having a gas andliquid separating chamber at its intakeside, a 1'0- tary gas pump of the type employing liquid for its pumping action, a conduit connecting said chamber with the intake of 'the gas pump, said conduit having a' restricted orifice, whereby at all times a free passage for gas is provided, but little liquid can flow through said orifice, a gasand-liquid separating tank connected to the outlet of the gas pump, and an independent conduit extending from said tank to said gas pump to keep the latter, supplied with the liquid necessary for its operation.

3. In a pumping apparatus in combination, a unitary structure comprising a rotary liquid pump and a hydro-turbine gas pump, said structure being adapted to' be placed above the level of liquid to be pumped, a liquid and gas separating chainber on the intake side of the liquid pump, a

connection between said chamber and the intake side of the gas pump whereby the gas pump is adapted to prime the liquid pump, a gas and liquid separating tank on the discharge side of the gas pump, said tank being adapted to supply the gas pump with the liquid necessary for its operation.

In testimony whereof I hereunto aflix my signature; r

' IRVING C. JENNINGS.

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