US2901976A

US2901976A - Pumps

Info

Publication number: US2901976A
Application number: US585559A
Authority: US
Inventors: Kenneth R Lung
Original assignee: Tait Manufacturing Co
Current assignee: Tait Manufacturing Co
Priority date: 1956-05-17
Filing date: 1956-05-17
Publication date: 1959-09-01
Anticipated expiration: 1976-09-01

Description

K. R. LUNG PUMPS Filed May 17, 1956 Sept. 1, 1959 ATTORNEYS United States Patent Manufacturing Company, Dayton, Ohio, a corporation of Ohio Applicatiqn May 17, 1956,seri1N0.5s5,559 3 claims. (ci. 10s-5) This invention relates to centrifugal pumps and more particularly to -a centrifugal pump for use in conjunction with a jet pump to 4form a centrifugal-jet pumping system.

It is a primary object of the invention to provide a. centrifugal-jet pumping system which is readily convertible for either shallow or deep well use, and especially to provide a centrifugal pump for inclusion in such system which is of improved and novel construction affording unusual ability to operate effectively and eiciently even under conditions of a substantial proportion of air in the liquid being pumped.

It is therefore an object of the invention to provide a centrifugal pump for use in conjunction with a jet pump as outlined above wherein the pump casing includes an inlet chamber for connection wit-h the discharge side of the jet pump which is of such construction and arrangement as to assure that any air discharged by the jet pump will be transmitted to the impeller of the centrifugal pump and cannot remain in the line where it could cause a possible air lock.

Another object of the invention is to provide a centrifugal pump as outlined above wherein the pressure port for connection of the nozzle ofthe jet pump is so located with respect to the diffuser passages lfrom the pumping `chamber wherein the centrifugal impeller operates as to assure maximum freedom from air for the liquid supplied under pressure to the jet pump nozzle.

It is also an object of the invention to provide a centrifugal pump having the structural and operational characteristics outlined above wherein the ports for connection to the jet pump are on the side of the centrifugal pump casing for ready access with minimum requirements of overall length.

Additional objects and advantages of the invention will be apparent from the following description, the accompanying drawing and the appended claims.

In the drawing- Fig. l is a view partly in side elevation and partly in l vertical section on the line 1-1 of Fig. 2 showing a centrifugal pump constructed in accordance with the invention;

Fig. 2 is a section on the line 2-2 of Fig. 1 and showing a pumping system for shallow well operation;

Fig. 3 is a detail view looking toward the back of the pump body or -main casing of the pump of Fig. 1, the view being partly in elevation and partly broken away to illustrat-e details of internal construction; and

Fig. 4 is a front elevational view showing a pumping I system in accordance with the invention for deep well use.

Referring to the drawing, which illustrates a preferred embodiment of the invention, the electric drive motor 10 is bolted to a bracket 11 which is shown as of essentially the same construction disclosed in my copending application Serial No. 482,605, led January 18, 1955, `and issued as Patent No. 2,836,124 on May 27, 1958, to the same assignee as this application. The drive motor shaft ICC 12 projects through a bore in the opposite side of the bracket 11 from motor 10, `and 'this shaft 12 carries a centrifugal impeller 13. The junction between the shaft 12 and bracket 11 is provided with a rotary seal indicated generally at 15 as `also described in detail in my above copending application.

The main pump body 20 is also bolted to the bracket 11 at 21 and encloses the discharge chamber 22 for receiving the output of the impeller 13. The casing 20 includes an imperforate front wall 23 which overlies the discharge chamber 22, and the rear wall 24 of the casing forms the front of the pumping chamber 25 in which the impeller 13 operates. The wall 24 is provided with a centrally located inlet opening 26 therethrough with which the inlet 27 of the impeller registers, and this inlet opening 26 is surrounded by a cylindrical boss portion 28 of the wall 24.

The casing 20 also -includes an intermediate wall 30 which extends from side to side entirely across the discharge chamber 22 and cooperates with the back wall 24 to dene an inlet or suction chamber 31 entirely separate `from the `discharge 22. This inlet chamber 31 overlies the inlet opening 26 to the impeller, and the wall 30 is so propo-rtioned as to locate this opening in registry 'with the uppermost portion of the inlet chamber. Thus as best seen in Fig. 2, the upper portions of the wall 30 are integral with the upper p-art of the boss 28 and diverge downwardly therefrom, and the lower portion of the wall 30 is spaced below the boss 28 so that a substantial portion of the chamber 31 lies entirely below the inlet opening 26.

On one side of the casing 20, there is provided a port 33 which forms the inlet to the inlet chamber 31. Below the port 33 on the same side of the casing is a port 35 which opens into the lowermost portion of the discharge cham-ber 22. At the opposite side of the casing 20 from the port 33 is a bore 36 which is provided primarily for convenience in casting the casing, and while it may be used for cleaning purposes after the pump has been used, it is normally closed by a plug 37.

The

ports

35 and 33 are respectively the .pressure and suction ports for connection with the nozzle and the discharge side of the jet pump, and the side portion of the casing surrounding these ports is `formed to provide a boss 39 for directly receiving the jet pump housing 40 thereon as shown in Fig. 2 when the combination is to be used for shallow well operation. This housing 40 carries therein the jet nozzle 41 and cooperating Venturi tube 42 which projects through the port 33 into the interior of the inlet chamber 31 to deliver the discharge from the jet pump to the chamber 31. The pressure port 35 similarly connects directly with the passage 43 within the jet housing 40 which' leads to the nozzle 41, and the suction chamber 44 of the jet is connected by a suction line 45 to the well or other source of liquid to be pumped.

Fig. 3 best illustrates the arrangement of the diffuser passages 50 within the casing 2t) by which the liquid travels from the impeller 13 and the pumping chamber 25 to the discharge chamber 22. There are two of these passageways 50 which are cast in the casing 20 and defined in part by rib-like portions 51 between the inner and outer portions of the wall 24, and the front wall of each of the diffuser passageways is formed by a web portion 52 of the casing 20. Each of these diffuser passageways 59 terminates at its discharge end in a port 55 extending through the web 52 into the discharge chamber 22, .and Pig. 3 shows that these ports 55 are is connected to the casing 20- through a boss `6]; adjacent the upper opposite corner of the casing from the discharge port 35. Within this boss is a vertical wall 62 forming a chamber 63. separate from they chamber 22 and connected therewith by a passage 65 through the wall 62. An adjustable valve 66 extends through the front wall of the casing for cooperation with the passage 654 to restrict the discharge from chamber 22 and thereby to maintain proper pressure within the chamber for operation of the jet pump. The plug 67 closes. a port in the top of the chamber 22. for priming the pump.

In shallow well operation, the jet pump; housing 4.01 is mounted on casing 20 as described inconnection with Fig. 2, and the pressure developed by the dischargel from the impeller in the pumping chamber 25 is supplied to the jet nozzle 4l to develop suction in the chamber and line 45, and the discharge from the jet pump venturi 42 is supplied directly to the inlet chamber 3l for transmission to the inlet of the impeller. Since the pressure port 35 is located adjacent the bottom of the chamber 22 and also since the ports 55 which connect the diffuser passages with the chamber 22 are located at substantially the maximum distances for both thereof away from pressure port 35, any air which may be present in the liquid has the maximrun opportunity for separation from the liquid before the latter reaches port 35. This construction therefore provides assurance that substantially air-free liquid will be supplied to the jet nozzle 4d. Similarly, with the intermediate wal-l 35 constructed as described to locate the inlet opening 26 at the top of the chamber 3l and at substantially the apex of the inclined upper portions of the wall 30, any air entering the chamber 3i from the jet pump will be directed into the opening 26 for further transmission to the chamber 22 and ultimately to the discharge line 60, and it cannot remain in the chamber 31 to cause a possible air lock. This result is further facilitated by the location of the port 33 with its axis spaced well below the opening Z5 since this arrangement also facilitates separation of air Within chamber 3l for assured passage to and through the inlet opening 26.

Fig. 4 shows the manner of assembling a pumping system in accordance with the invention for deep well operation. Instead of mounting the jet pump housing 40 directly on the casing, it is connected thereto by pipes 7) and 7l which in turn are connected with the

ports

33 and 35 respectively by means such as a coupling 72 which may be of the type disclosed in my copending application Serial No. 437,515, led lune 17, 1954, and issued as Patent No. 2,786,417 on March 26, 1957, to the same assignee as this application. Otherwise, the mode of operation of the deep well pumping system of the invention is essentially the same as for the shallow well operation already described, and the same practical advantages are obtained as inl shallow well operation.

While the forms of apparatus herein described constitute preferred embodiments of the invention, it is to be understood that the invention is not limited to these precise forms of apparatus, and that changes may be made therein without departing from the scope o f the invention which is defined in the appended claims.

What is claimed is:

1. in a centrifugal pump of the character described for use in conjunction with a jet pump including a nozzle and a Venturi tube, a pump casing enclosing a discharge chamber and including an imperforate front wall overlying said discharge chamber, means for supporting said casing in a horizontally extending operating position with said discharge chamber located at the front thereof, a back wall in said casing defining the front of a pumping chamber and having a centrally located inlet opening therethrough, an impeller supported in said pumping chamber on a horizontal axis with the inlet thereof registering with said opening, an intermediate wall extending laterally across the interior of said discharge chamber in rearwardly spaced relation from said front wall and cooperating with said back wall to deiine an inlet chamber entirely separate from said discharge chamber and overlying said opening, means forming a pressure port leading laterally from said discharge chamber below said intermediate wall for connection to said jet pump nozzle, means forming an inlet port to said inlet chamber located directly above and parallel with said pressure port for connection with the output side of said jet pump to conduct the discharge therefrom to said inlet chamber, means forming a discharge port from said discharge chamber located above said intermediate wall, means form-ing a pair of diffuser passages each extending substantially around the periphery of said pumping chamber, and means forming a connecting passage from each said diffuser passage to said discharge chamber and located respectively adjacent the top of said discharge chamber and adjacent the opposite side thereof from said pressure port to minimize access to said pressureport of air in they liquid being pumped.

2. In acentr-'ifugal pump of the character described for use in conjunction with a jet pump including a nozzle and` a venturi tube, a pump casing enclosing a discharge chamber and including an imperfora-te front-wall overlying said discharge chamber, means for supporting said casing in a horizontally extending operating. position with said discharge chamber located at the front thereof, a back wall in said casing defining the front of a pumping chamber and having a centrally located annular boss defining an inlet opening therethrough, an impeller supported in said pumping chamber onl a horizontal axis with the inlet thereof registering with said opening, an intermediate wall extending laterally across the interior of said discharge chamber in rearwardly spaced relation from said front wall and cooperating 'with said back wall to define an inlet chamber entirely separate from said discharge chamber and overlying said opening, said intermediate wall being proportioned to locate said opening in. registry with the uppermost portion of said inlet charnber and to provide a substantial portion of said inlet chamber lying entirely below said opening, means forming a pressure port leading laterally from said discharge chamber below said intermediate wall for connection to said jet pump nozzle, means forming an inlet port to said inlet chamber located above and parallel with said pressure port and below the level of said inlet opening for connection with the output side of said jet pump to conduct the discharge therefrom to said inlet chamber, and the upper portions. of said intermediate wall being integral with and diverging downwardly from said boss to assure passage to and through said opening of all air entering said inlet chamber.

3. In a centrifugal pump of the character described for use in conjunction with a jet pump including a nozzle and a venturi tube, a pump casing enclosing a discharge chamber andv including an imperforate front wall overlying said discharge chamber, means, for supporting said casing in a horizontally extending operating position with said discharge chamber located at the front thereof, a back wall in said: casing definingl the front of a pumping chamber and having a centrally located annular boss defining an inlet opening therethrough, an impeller supported in said pumping chamber on a horizontal axis with the inlet thereof registering with said opening, an intermediate wall extending laterally across the interior of said discharge chamber in rearwardly spaced relation from said front wall and cooperating with said back wall to define an inlet chamber entirely separate from said discharge chamber andV overlying said opening, said intermediate wall being proportioned to locate said opening in registry with. the uppermost portion of said inlet chamber and to provide a: substantial portion of said inlet chamber lying entirely belowy said opening, means formingy a pressure port leading laterally from said discharge chamber below said intermediate Wall for connection to 5 said jet pump nozzle, means forming an inlet port to said inlet chamber located above and parallel with said pressure port and below the level of said inlet opening for connection with the output side of said jet pump to conduct the discharge therefrom to said inlet chamber, the upper portions of said intermediate wall being integral with and dverging downwardly from said boss to assure passage to and through said opening of all air entering said inlet chamber, means forming a discharge port from said discharge chamber located above said intermediate Wall, means forming a pair of diffuser passages each extending substantially 180 around the periphery of said pumping chamber, and means forming a connecting passage from each said diffuser passage to said discharge chamber and located respectively adjacent the top of said discharge chamber and adjacent the opposite side thereof from said pressure port to minimize access to said pressure port of air in the liquid being pumped.

References Cited in the ile of this patent UNITED STATES PATENTS 2,319,230 Harrington May 18, 1943 2,335,109 Conery Nov. 23, 1943 2,375,571 Mann May 8, 1945 2,452,874 Shallenberg Nov. 2, 1948 2,474,539 Mann June 28, 1949 2,479,969 Schleyer Aug. 23, 1949 2,619,036 Mann Nov. 25, 1952 2,632,393 Tinker Mar. 24, 1953 2,657,641 Lung Nov. 3, 1953