US2335109A - Combination centrifugal ejector pump - Google Patents

Description

Nov. 23, 1943-. w. J. coNERY COMBINATION CENTRIFUGAL EJEGTOR PUMP Filed June 2, 1942 5 Sheets-Sheet 1 wv a/M/:w William Jia/zeig /QZ/ Nov. 23, 1943. w J, CONERY 2,335,109

COMBINATION CENTRIFUGAL EJECTOR PUMP Filed June 2, 1942 3 Sheets-Sheet 2 j Wil/alfa Jia/Zay Nov. 23, 1943. w` J. coNERY 2,335,109

COMBINATION CENTRIFUGAL EJECTOR PUMP Filed June 2, 1942 3 Sheets-Sheet 3 @M mw Patented Nov. 23, 1943 COMBINATION CENTBIFUGAL EJECTOB PUMP William J. Conery, Ashland, Ohio, assignor to The F. E.' Myers 3: Bro. Co., Ashland, Ohio, a

corporation fof Ohio Application June 2, 1942, Serial No. 445,436 4 Claims. '(Cl. 103-5) The invention relates to pumps and more particularly to a self-priming pump of the centrifual .iet Pipe.

It is `an object of the present invention to provide apump oi this character which is of simple construction, inexpensive and easy to install and efdcient and reliable in operation.

Another object is the provision of such a pump which is especially eicient both in self-priming and in pumping water containing a considerable amount of air.`

Still another object is to provide a pump of this character which may be quickly and readily converted from a shallow well pump to a deep well pump with a minimum of labor, time and expense.

A further object of the invention is the provisionof a centrifugal pump in which a closed impeller and surrounding diiiusion vanes are located directly within a separating chamber of sufficient volume to eiiciently and quickly sepa.- rate air from the water.

A still further object is the provision of a combined centrifugal ejector pump in which the centrifugal pump impeller and motor rotate upon a horizontal axis and an axially aligned horizontal jet discharges water directly into the center of the impeller.

Another object of the invention is the provision of a pump of the character referred to which is so constructed and arranged that all moving parts of the pump may be removed as a single unit.

A further object is the provision of a pump of this character in which the complete ejector assembly may be quickly and easily removed as a unit permitting the pump to be used for deep well service.

The above objects together with others which will be apparent from the drawings and following description or which may be more particularly pointed out hereinafter may be attained by constructing the improved pump in the manner illustrated in the drawings in which- Figure 1 is a vertical longitudinal sectional view through the improved centrifugal ejector pump showing the ejector unit assembled thereon for use as a shallow well pump;

Fig. 2, a transverse vertical section taken as on the line 2 2, Fig. l;

Fig.3, a horizontal, longitudinal sectional view of the ejector unit removed from the pump;

Fig. 4, a vertical longitudinal sectional view through the improved centrifugal pump with the elector unit removed therefrom;

` Fig. 5, a top plan view of the assembled pump as shown in Fig. 1;

Fig. 6, a side elevation of the centrifugal ejector pump as applied to a shallow well;

Fig. 7, a view similar to Fig. 6 showingthe centrifugal pump, minus the elector unit, as applied to a deep well, and v Fig. 7a, an elevation of the foot valve and strainer located below the ejector assembly of Fis. 7.

Similar numerals refer to similar parts throughout the drawings.

The pump may be supported upon a base I0 arranged to be mounted upon a concrete support II or the like asby the bolts. I2. The discharge casing I3 forming an air separation chamber I4 is mounted upon the base Ill to which it may be connected as by thebolt I5.

A motor supporting bracket I6 is supported upon the discharge casing I3, said motor supporting bracket being provided with a reduced neck I1 which is located through the opening I8 in the discharge casing, the bracket being attached to the casing as by the bolts I3.

The motor 2li, which is horizontally disposed as shown in the drawings,'is mounted upon the motor supporting bracket I6 to which it is attached as by the bolts 2|, and the motor shaft 22 extends through the bracket and through the central bore 23 of the pump shaft 24 to which itis connected as by the split collet 25 and nut 2B.

'I'he pump shaft 24 extends through a specially constructed stung box seal 26a mounted within the central neck 21 formed upon the motor supporting bracket I6, thus eliminating packing.'

lhaving a relatively close clearance with respect to the rotating cylindrical inlet portion 3i of the impeller. A case seal gasket 38 seals the joint between the casting 32 and the casing I3.

The discharge outlets or channels 31 located between the vanes 32 increase in cross sectional area toward their outlets into the chamber I4.

As shown in Figs. 1, 2 and 4 the impeller and diil'usion vanes forming the centrifugal pump are located directly within the air separating chamber I4 so that the water is discharged` from the 'diii'usion vanes directly into said separating chamber.

The outer side of the discharge casing 30 is provided with an opening 38, axially aligned with the cylindrical inlet 3l of the impeller and screw threaded for a purpose to be later explained. Directly below the opening 38 the wall of the casing I3 is provided with a second opening 39 which is `also screw threaded. A,

V The ejector unit is carried within a casing 40 having a flange 4I at its inner open end. arranged to be detachably connected to the adjacent wall of the discharge casing i3 as by screws 42.

A horizontal Venturi tube 43 is mounted within the casing 40, as by means of the screw threads 44, and extends beyond the anged open'end 4l of said casing so as to be located through the opening 38, terminating a short distance from the inlet 3l of the impeller, with which the Venturi tube is axially aligned.

The nozzle 45 is mounted within the casing 4B as by the screw threads 4B, justahead of the Venturi tube 43 and in alignment therein.

A threaded opening 4l is formed in the outer end of the ejector casing 40, in line with the nozzle and Venturi tube and arranged to be normally closed by the screw plug 48.

A passage 49 is formed in the casing 4B providing communication between the nozzle 45 and the separating chamber I0, through the lower opening 39.

An inclined drain or cleanout opening 5i may be provided in the lower portion of the chamber I and arranged to be normally closed as by the screw plug 52.

In Fig. 6 the pump is shown installed as a shallow well unit. The suction pipe 53 is connected to the inlet neck D of the ejector unit which is mounted upon the pump in the manner shown in detail in Fig. l. A check valve 54 or a foot valve 55, or both may be provided for this installation.

It should be understood that' the outlet 56 at the upper portion of the chamber I4 is arranged to be connected to the usual pressure storage tank, or to an elevated tank or reservoir..

For initial starting the chamber i4 is lled with Water through the opening 55. The motor 2U is started and the impeller 28 immediately starts to circulate water creating vacuum at the impeller inlet 3| and creating pressure in the chamber I4 causing water'to flow through the opening 39 to the nozzle 45 through the passage 49. Y

The Water :flowing through the nozzle 45 into the Venturi tube 43 creates a vacuum in the chamber 51, which is directly connected to the suction pipe 53, and this vacuum draws air from the suction pipe 53 mixing the air with water entering the pump impeller 28, this water and air passing through the impeller, out through the diifusion vanes and directly intothe chamber lil, wherethe air automatically iiows to the top of the chamber and through the outlet 56 to the pressure tank or the like while the heavier water,7 free from air is circulated to the bottom of the chamber I4, and recirculated through theV opening 39 and passage 49 to the nozzle 45 'I'his cycle continues until all of the air is ex.- hausted from the suction pipe 53 after which water free from air is taken into the pump and the pump operates at its normal, pressure andA capacity, the water being discharged from the outlet 56 to the usual pressure storage tank or an elevated tank or reservoir.

Should air again get into the suction pipe 23 due to a leak or from drawing 'water below the foot valve 55, or from gas entrained in the water, the water and air will immediately be recirculated through the pmp in the manner above described and the air will be freed to the top of the chamber i4 and liberated through the outlet 56. Y

In this type of pump it is extremely important Y that any air entrained in the water will be quickly liberated so as to prevent the pump from choking oft in capacity or losing prime completely, in which event a long interval would elapse before the pump would begin to again operate at full capacity.

'It is known that there are pumps of this general type operating on somewhat the same general principle'but they will not handle any great amount of air and require too long a period of time to prime if the pump loses prime completely due to too much air.

Most pumps of this general type are built with the motor and pump in vertical position and the air separating chamber separated from the pump discharge case. Furthermore, pumps of this type generally use a discharge case of the volute design rather than the diiusion vane construction disclosed in this case.

It has been found that by using the instant construction with the pump and motor in a horizontal position and the impeller discharging through a diiusion vane directly into the air separating chamber the priming emciency of the pump is greatly increased.

The reason for this is that the diffusion vane having a plurality of ports allows the air to es cape directly into the separating chamber much quicker than is possible if a volute construction is used around the impeller,

Further, the heavier water is allowed to reenter the impeller at the periphery and give an additional recirculation in the impeller thus helping to remove the air more rapidly.

'I'his combination with the ejector creates additional vacuum causing the air to be removed rapidly from the suction pipe and diiusion vane and allowing this air to be rapidly removed from the impeller, resulting in much greater emeiency than has been produced by any pump of this general type heretofore produced.

This results in far greater priming eiciency than is possible with any other pump of this general type, which is avery important-feature.

This is especially true in case of an air leak where the pump may lose prime due to too much air. In such case the water is used from the tank until the pressure becomes low, as the pump will not be furnishing any additional water. I

With this type of pump it is also desirable to take air in through the suction of the pump to maintain a proper air cushion in the pressure tank, therefore a pump capable of handling a considerable amount of air without much reduction in capacity is very desirable.

'I'he construction of this pump is very simple, being composed of three main parts, the air separating chamber and pump discharge case; the motor bracket and impeller assembly; and the ejector assembly, whereby all moving parts of the pump may be removed as a single unit.

The complete ejector assembly may be removed as a unit by removing the screws 42 which attach the ejector housing 4D to the pump discharge case connected to the upper opening 38 for delivering.

water from the well.

An ejector assembly 60 which may be of any usual and well known design, is connected to the lower ends hof the pipes 58 and 59, and a oot valve 55a may be installed below said ejector.

With this deep well installation of the improved pump, any air entrained in the water is eliminated at the diilusion vanes and is vented to the top of the air separating chamber i4 and carried into the pressure tank, or into the open.

By constructing the improved pump in the manner illustrated and described, it may be .installed originally as a shallow well pump, as shown in Fig. 6, and'in case the water level is lowered below twenty-uve feet, the shallow well ejector unit lll may be removed and the deep well ejector 60 may be placed in the well and connected to the pumpby the pipe 58 and 59, as shown in Fig. 7, making it possible for the pump to lift the water beyond the suction lift limit.

I claim: I

1. Ina. pumping apparatus, a casing, a rotatable pressure pump having a suction inlet and a discharge mounted in said casing, one wall of said casing having two spaced openings therein, one of said openings registering with the inlet of the pressure pump, an ejector casing removably mounted upon said wall, a Venturi tube in said ejector casing, a nozzle in said ejector casing, said Venturi tube and nozzle being in axial alignment with each other and with the inlet of the pressure.

pump, a suction pipe connected to the ejector casing in' such position that liquid drawn therethrough ilows into the ejector casing and through the space between the nozzle and the Venturi tube, said Venturi tube being located through said one opening in the casing wall in axial alignment with the suction inlet of the pressure lpump and terminating adjacent thereto, the jet pump and pressure pump inlet thus being in axial alignment in order that the jet may deliver axially to the pump inlet so that liquid flowing to the nozzle and drawn through said suction pipe and flowing from the Venturi tube passes in a horizontal direction axially to the inlet of the pressure pump, a passage in the ejector casing communicating with said nozzle and with the other opening in said casing wall, a chamber in the casing communicating with the pressure pump discharge, an outlet in the chamber through which a portion of the liquid flows to an external point of use, a portion of the liquid ilowing from the chamber through said other opening and through said passage to the nozzle.

2. In a pumping apparatus, a casing, a rotatable pressure pump having a suction inlet and a discharge mounted in said casing, one wall o1' the casing having two spaced openings therein which when uncovered enable communication between the inlet and discharge of the pump and a point externally of the casing, one of said openings registering with the inlet of the pressure pump, an ejector casing removably mounted upon said wall and covering said openings, a Venturi tube in said ejector casing, a nozzle in said ejector casing, said Venturi tube and nozzle being in '(5l axial alignment with each other and with the inlet of the pressure pump, a suction pipe connected to the ejector casing in such position that liquid drawn therethrough flows into the ejector casing and through the space between the nozzle and the Venturi tube, said Venturi tube being located through said one opening in the casing wall in axial alignment with the suction inlet of the pressure pump and terminating adjacent thereto, the jet pump and pressure pump inlet thus being in axial `llignment in order that the jet may deliver axially to the pump inlet so that liquid flowing to the nozzle and drawn through said suction pipe and flowing from the Venturi tube passes in a horizontal direction axially to the inlet of the pressure pump, a passage in -the ejector casing communicating with said nozzle and with said other opening in said casing wall, a chamber in the casing communicating with the pressure pump discharge, an outletV in the chamber through which a portion of the liquid ilows to an' external point of use, a portion of the liquid ilowing from the chamber through said other opening and through said passage to the nozzle.

3. In a pumping apparatus, a casing, a rotat-A able pressure pump having a suction inlet and a discharge mounted in said casing, one wall of the casing having two spaced openings therein which when uncovered enable communication between the inlet and discharge of the pump and a point externally of the casing, one of said openings registering with the inlet of the pressure pump, an ejector casing removably mounted upon said Wall and covering said openings, a Venturi tube in said ejector casing, a nozzle in said ejector casing, said Venturi tube and nozzle being in axial alignment with each other and with the inlet of the pressure pump, a suction pipe connected to the ejector casing in such position that liquid drawn therethrough flows into the ejector casing and through the space between the nozzle and the Venturi tube, said Venturi tube being located through said one opening in the casing wall in axial alignment with the suction inlet of the pressure pump and terminating adjacent thereto, the jet pump and pressure pump inlet thus being in axial alignment in order that the jet may deliver axially to the pump inlet so that liquid flowing to the nozzle and drawn through said suction pipe and flowing from the Venturi tube passes in a horizontal direction axially to the inlet of thepressure pump, a passage in the ejector casing communicating with said nozzle and with said other opening in said casing wall, a chamber in the casing, the pressure pump being located within said chamber and discharging directly into the chamber, said chamber being of suilicient size to slow down the velocity of the liquid and to permit liquid and air separation to take place in the chamber, an outlet in the upper portion of the chamber through which a portion of the liquid flows to an external point of use, a portion of the liquid flowing from the chamber through said other opening and through said passage to the nozzle.

4. In a pumping apparatus, a casing, a rotatable pressure pump having a suction inlet and a discharge mounted in said casing, one wall of the casing having two spaced openings therein which when uncovered enable communication between the inlet and discharge of the pump and a point externally of the casing, one of said openings registering with the inlet of the pressure pump, an ejector casing removably mounted upon said wall and covering said openings, a Venturi tube in said ejector casing, a nozzle in said elector casing, said Venturi tube and nozzle being in axial alignment with each other and with lthe inlet of the pressure pump, a suction pipe connected to the ejector casing in such position that liquid drawn therethrough ows into the ejector Veasing and through the space between the nozzle and the Venturi tube, said Venturi tube being located through said opening in the casing wall in axial alignment with the suction inlet of the pressure pump and terminating adjacent thereto, the jet pump and pressure pump inlet thus being in axial alignment in order that the jet may deliver axially to the pump inlet so that liquid ilowing to the nozzle and drawn through said suction pipe and flowing from the Venturi tube passes in a horizontal direction axially to the inlet of the pressure pump, a passage in the elector casing communicating with said nozzle and with said other opening in said casing Wall, a chamber in the casing, the pressure pump being located within said chamber and discharging directly into the chamber, said chamber being so located that the greater portion of the volume thereof is located above 'the pressure pump, and the chamber

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