US2484105A - Ejector pump - Google Patents

Description

ct, M, 19490 M. a. M NEILLE ET AL EJECTOR PUMP Filed Nov. 13, 1945 2 Sheets-Sheet 1 meigiors @cfi. 11, E949. B. MacNEBLLE ET AL fi hmfi EJECTOR PUMP Filed Nov. 13, 1945 2 Sheets-Sheet 2 Patentecl Oct. 11, 1949 HECTOR PUMP Martin B. MacNeille and Raymond W. Frank, Dubuque, Iowa, assignors to A. Y. McDonald Manufacturing Co., Dubuque, Iowa, at corporation of Iowa Application November 13, 1945, Serial No. 628,177

Claims. (01. 103-5) Our invention relates to a centrifugal pump of the jet variety and has for its primary purpose the provision of a typeof pump known as the shallow well jet type and in which access can be had to the inner parts of the pump structure, particularly the jet assembly and the impeller for the removal or replacement of these parts, would it become necessary or desirable after the pump is in operation.

Another and further object of our invention is the provision of a shallow well jet pump which can be easily and quickly converted into a pump of the ordinary centrifugal type and if desired can be converted into a type of pump known as the deep-well jet type variety in which the jet assembly is usually placed in the well or at some remote position away from the pump structure proper.

Another and further object of our invention is the provision of a pump structure which is compact and which can be placed in horizontal positions in use on farms and the like for the purpose of drawing water from wells or for forcing the water into various/places, particularly in farming operations as well as in city homes and the like.

Another and further object of our invention is the provision of a shallow well pump which can be easily converted into other types of pumps by an ordinary workman or mechanic without the necessity of having to make major changes in the pump and if desired the operating parts can be sold by a dealer in separate units which can be easily attached to or detached from the pump structure for conversion purposes.

Another and further object of our invention is the provision of a jet pump having a jet assembly located therein which is firmly and easily fixed into the structure and capable of removal therefrom by an ordinary mechanic, made in such manner that it is practically impossible to insert the jet assembly in an improper manner, and which can be easily removed for the insertion of repair parts or for cleanout purposes if desired or necessary. 1

Another and further object of our invention is the provision of a pump having the jet assembly firmly mounted and supported in the pump structure in such manner that it will not become displaced and which when placed in the structure would not be easily displaced or rendered inoperative by water pressure or the like in the pump housing.

Another and further object of our invention is the provision of a pump having a volute out- Figure 3 is a cross-sectional view on lines 33 of Fig. 1.

Referring now specifically to the drawings and in which like reference characters refer to like parts throughout, a pump casing is provided composed of a main rectangular section and a bulletlike section I I at one side of the said main section, the main section having a rear end wall l2 with a circular opening l3 therein and a trunnion-like extension l4 round the opening I3, the extension having an outer bearing face l5 thereon. A bottom wall It is provided having base portions I1, I1 thereon on which the pump structure rests upon any suitable foundation with side walls l8 and I9 which are curved toward each other and merge into a top wall 20 having an internally threaded trunnion 22 thereon to which an outlet pipe 23 is secured. Integrally formed with the side walls l8 and IS, the bottom wall l6 and a vertical front wall 24 is a bullet-shaped extension 25 having an opening 26 in the end thereof within which a bushing 21 is threaded with a threaded plug 28 therein, the bushing 21 and the plug 1, 28 forming closure members for the opening 26.

The extension 25 has an opening 29 in one side thereof within which an inlet pipe 30 extends which leads to any suitable source of water or other fluids upon which the pump is operating.

An inner wall structure 3| is provided generally boot-shaped in longitudinal section and substantially circular in cross section throughout the greater extent of its length thereby providing an intake chamber 32 inside of the main chamber 33 formed by the outer wall of the pump structure as hereinbefore described. The wall structure 3| has an outfiared end portion 34 integrally formed with the main wall structure 3| and with the rear end wall l2, the bottom I 6 and the side walls l8 and I8, except adjacent the wall l8. An opening 35 is formed from the impeller chamber 36, one side of which is formed by the outwardly flared end portion 36 of the wall structure 3i. A plate 31 forms a closure for the rear side of the impeller chamber 35, with a flange 38 thereon through which bolts 39 .extend into the trunnion like extension i l on the back plate i2 thereby forming a complete pump housing.

The wall 3i has an opening it therein opposite the opening in the end of the extension 25 through which the jet assembly is inserted and removed when desired, the jet assembly comprising a tubular member iii having a flange t2 thereon to which are secured a plurality of spaced legs Q3, 33 which connect with the flange 12 on the tubular member 3! at one of their ends and with a threaded ring 5% at their other ends. The ring it is in threaded engagement with the member 3i and has studs d5, 35 for engagement with a suitable wrench whereby the jet assembly can be secured in place in the wall structure 3i and removed therefrom when desired. A jet member a? is inserted in the ring at with. a press fit in the ring with its outer end flush with the wall structure 3! and its inner end terminating at the entrance of the Venturi passage in the member 4! which is curved outward at the end of the passage. Extending circumferentially of the wall structure is a flange 6B which supports the inner end of the member d! with a flange %9 extending around the member ll and in abutting engagement with the side of the flange d8 whereby the rear end of the tubular member 55 is supported and held in position in the walled structure 3i.

An impeller having a hollow hub portion 5i with a renewable seal 52 mounted in the structure 3! is provided having radially extending passages 53, 53 therein extending from the opening in the hollow hub to the outer periphery of the impeller 50, the passages 53 being in communication with the volute discharge passage 36 which extends circumferentially around the periphery of the impeller 58 and which terminates at 56 where it connects with passage 55 formed by the end wall l8 and a wall member 55 integrally formed'with the wall l8. The wall member 56 is angularly positioned whereby the passage 55 increases in size toward its discharge end as shown particularly in Fig. 2.

The impeller 50 is mounted upon and supported by a motor shaft 51 having a spring pressed seal 58 therearound to prevent leakage through the opening in the plate 31 through which the motor shaft 51 extends. A motor 59 is provided with which the motor shaft 5? is connected, the motor 59 being secured by means of brackets 5Q, 56 and a ring 6! to the member 3i which in turn is se- 1 cured to the main housing as heretofore described.

The operation of the pump as shown and described will be well understood, it is believed, by those skilled in the art. Normally these pumps must be kept primed, that is filled with water or other fluid, or substantially so, before being operated. Drain openings can be provided through which water can be drained if desired to prevent freezing, and if the pump is drained the pump casing must be filled with water, prior to commencement of operation of the pump. Assuming that the casing is filled with water as the motor commences operation, the impeller 50 rotates in a counterclockwise direction thus forcing water out of the passage 53 and building up pressure in the main chamber. As the pressure in the main chamber is built up, water is forced through the jet 4'? thereby materially increasing the suc j the end of the intake passage in the tube 45 until maximum capacity of the pump is obtained, depending partially upon the speed at which the impeller is rotated. The water is discharged into the volute passage 36 and thence to the passage 55 into the main chamber and a portion discharged through the outlet pipe 23, and another portion 7 passing through the jet M.

In assembling the pump for the operation described above, the motor 59, the impeller 50 and plate 3'5 can be assembled as a unit, and placed in position in the main casting and attached to the flange id in the main housing by the bolts 39, and detached from the main housing for the purpose of removing any of the parts, bearings or the like for the purpose of renewal, repair, cleaning or the like.

The jet assembly is inserted in the chamber 32 through the opening 26 in the wall 25. The jet fill is placed in position in the ring M, the jet 4? being secured in position in the ring 44 by being pressed therein and held in position by a friction fit, and the whole jet assembly including the tube 6| is placed in position with the inner end of the tube ll supported by the flannge 38. The ring Ml is threaded into the wall 3i and a wrench applied to the studs &5 so as to tighten the jet assembly in position. In order to produce the greatest emciency it is advisable that the inner end of the jet Q7 terminate at the entrance of the Venturi passage through the tube M which it will be noted is outwardly flared because of the contour of the flange $2. The outer surface of the jet is? is arcuate so as to provide sufficient space for the free flow of fluid around the jet and to insure the flow of fluid in an axial direction at the entrance of the passage in the tube M. The bushing 21 with the plug 28 therein is inserted thereby closing the casing and the pump is ready for operation when set up with suitable connections. When it is desired to renew the jet assembly the bushing 21 is removed, access is thereby had to the ring 54, a tool can be applied to the studs 45, the assembly removed for the purpose of repair, cleaning or the like as may be desired.

If it is desired to convert the pump into an ordinary centrifugal pump, the jet assembly is removed as hereinabove described, a plug is threaded into the opening 40 in the casing 31 thereby closing this opening, the bushing 21 with the plug 28 therein in place as shown and the pump operates as an ordinary centrifugal pump with the same inlet and outlet connections.

If it is desired to convert the pump shown and described into a type known as a deep well jet pump, the jet assembly is removed, a plug is threaded into the opening 40 closing the opening to the same as heretofore described, the plug 28 is removed from the bushing 21 and a drive pipe connected thereto which leads to a jet assembly in a casing usually positioned in the well with the inlet pipe 38 connected to the jet assembly casing whereby the pipe 30 performs the function of an outlet pipe for the remotely positioned jet assembly casing and an inlet pipe for the pump as described and claimed herein, all of which is well known and understood in the art.

We provide therefore a pump in which all of the interior parts are easily accessible to a person of ordinary skill for replacement and repair and the like. A pump is provided which can be easily and quickly changed to perform a plurality of functions which enables the manufacturer to make fewer models and types, the dealer to carry less stock, and which can be easily converted by an ordinary person to various uses and purposes.

While we have described more or less precisely the details of construction, we do not wish to be understood as limiting ourselves thereto, as we contemplate changes in form and the proportion of parts and the substitution of equivalents as circumstances may suggest or render expedient without departing from the spirit and scope of our invention.

We claim:

1. A horizontal pump comprising in combination a casing having a projecting portion with i an inlet opening in one side thereof and an opening in the end of the said projecting portion and having an outlet opening, the said casing having an inner wall structure formed therewith generally circular in cross section and encompassing the inlet opening and outwardly flared at one of it ends whereby an impeller chamber is formed having a discharge opening into the chamber formed by the casing'and having an opening therein in alignment with the opening in the end of the said projecting portion, a jet assembly comprising a tube, a threaded ring spaced from one end of said tube but connected thereto, a jet removably positioned in-said ring having its discharge end terminating adjacent the intake end of the said tube, the inner end 'of the said tube being supported by the inner wall structure and the threaded ring also being in engagement with the inner wall structure, the jet providing a communicating passage from the chamber formed by the casing and the chamber formed by the inner wall structure, a plate removably secured to said casing forming a closure member for one side of the impeller chamber, a rotary impeller having a central intake opening therein in said impeller chamber, and a removable plug in the opening in the end of the projecting portion of the casings the said jet discharging into the said impeller through the said tube, the pump having a flow line from the impeller discharge to the jet nozzle and from the jet discharge to the impeller intake opening.

2. A horizontal pump comprising in combination a casing having a projecting portion with an inlet opening in one side thereof and an opening in the end of the said projecting portion and having an outlet opening, the said casing having an inner wall structure formed therewith generally circular in cross section and encompassing the inlet opening and outwardly flared at one of its ends whereby an impeller chamber is formed having a discharge into the chamber formed by the casing and having an opening therein in alignment with the opening in the end of the said projecting portion, a jet assembly comprising a tube, a threaded ring spaced from one end of said tube but connected thereto, a jet removably positioned in said ring having its discharge end terminating adjacent the intake end of the said tube, the inner end of the said tube being supported by an annular flange on the inner Wall structure and the threaded ring also being in engagement with the inner wall structure, the jet providing a communicating passage from the chamber formed by the casing and the chamber formed by the inner wall structure, a plate removably secured to said casing 6 ings the said tube forming a discharge for the said Jet into the central opening of the impeller,

the said pump having a now line from the impeller discharge to the jet nozzle and from the jet discharge to the impeller intake opening.

3. A horizontal pump comprising in combination a casing having a projecting portion with an inlet opening in one side thereof and an opening in the end of the said pro ecting portion and having an outlet opening, the said casing having an inner wall structure formed therewith generally circular in cross section and encompassing the inlet opening and outwardly flared at one of its ends whereby an impeller chamber is formed having a discharge opening into the chamber formed by the said casing and having an opening therein in alignment with the opening in the end of the said projecting portion, a jet assembly comprsing a tube, a threaded ring spaced from one end of said tube but connected thereto, a jet removably positioned in said ring having its discharge end terminating adjacent the intake end of the said tube, the inner end of the said tube being supported by an annular flange on the inner wall structure and the threaded ring also being in engagement with the inner wall structure, the jet providing a com municating passage from the chamber formed by the casing and the chamber formed by the inner wall structure, a plate removably secured to said casing forming a closure member for one side of the impeller chamber, a rotary impeller having a hollow hub portion surrounded by a removable seal, and a removable plug in the openforming a closure member for one side of the ing in the end of the projecting portion of the casings the said jet discharging through the said tube into the hollow hub of the impeller, the said pump having a fiow line from the impeller discharge opening to the jet nozzle and from the Jet discharge to the hollow hub portion of said impeller.

4. A pump comprising in combination a main housing and a projecting portion at one side tnereoi', the main housing having a discharge opening therein, the projecting portion having an intake opening therein and a jet assembly opening in the end thereof, the said main housing and the projecting portion forming a main water chamber, an internal wall section integrally formed with said main housing and said projecting portion extending generally horizontal of the main water chamber and enclosing the intake opening in said projecting portion, having a jet assembly receiving opening therein and outwardly flared at one of its ends whereby an impeller chamber is formed, the impeller chamber having a discharge opening into said main chamber whereby communication is had between said impeller chamber and the main chamber, a rotary impeller having a central intake opening therein in said chamber, a jet assembly including a tube the inner end of which is supported by the internal wall section and having horizontally projecting legs on the opposite end and an externally threaded ring integrally formed with the said legs in threaded engagement with the said internal wall section and a jet having its inner end terminating adjacent the outer end of the said tube mounted in said externally threaded ring, a plate forming a. closure member for one side of the impeller chamber and a plug closing the opening in theend of the projecting portion, the said pump having a flow line from the impeller discharge opening to the jet nozzle and from the jet discharge to the central intake opening in the impeller.

5. A pump comprising in combination a main housing and a projecting portion at one side thereof, the main housing having a discharge opening therein, the projecting portion having an intake opening therein and a jet assembly opening in the end thereof, the said main housing andthe projecting portion forming a main water chamber, an internal wall section integrally formed with said main housing and said projecting portion extending generally horizontal of the chamber formed by the main housing and enclosing the intake opening in said projecting portion and having a jet assembly receiving opening therein and outwardly flared at one of its ends whereby an impeller chamber is formed having a discharge opening into said main chamber whereby communication is had between said impeller chamber and the main chamber, a rotary impeller in said chamber having a central intake opening therein, a jet assembly including a tube the inner end of which is supported by the internal wall section and in communication with intake opening in said impeller, the said tube having horizontally projecting legs on its opposite end and an externally threaded ring in- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,771,988 Anderson Aug. 5, 1930 2,077,213 Conery Apr. 13, 1937 2,137,406 Johnson Nov. 22, 1938 2,274,987 Lung Mar. 3, 1942 2,282,765 Mann May 12, 1942 2,313,585 Rupp Mar. 9, 1943 2,335,109 Conery Nov. 23, 1943

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