US2700338A - Shallow well centrifugal pump with jet - Google Patents

Description

Jan. 25, 1955 E. M. SMITH SHALLOW WELL CENTRIFUGAL PUMP WITH JET Filed Nov. 15, 1950 INVENTOR. 5o warm M 6mm,

United States Patent SHALLOW 'WELL CENTRIFUGAL PUMP WITH JET Edward M. Smith, Mansfield, Ohio, assignor to Barnes Manufacturing Co., Mansfield, Ohio, a corporation of Ohio Application November 15, 1950, Serial No. 195,723

1 Claim. (Cl. 103-5) This invention relates to improvements in a centrifugal pump and jet combination unit in a type of pump known as the shallow well jet type.

One of the objects of the present invention is the provision of a pump of the type described requiring a small number of parts, a limited amount of machining, and providing a very efficient pump when assembled.

Another object of the present invention is to provide a pump of the type described of a limited number of parts calling for a minimum concern for sealing joints when the parts are assembled, and these parts are so constructed and arranged that the mere bolting of the main housing parts together suffices to hold the pump assembled.

A stillfurther object of the present invention is to provide a pump of the type described wherein some of the liquid discharged from the volute outlet is recirculated through the main housing to the jet and wherein the interior surface of said housing and all other surfaces exposed to the recirculating liquid are maintained substantially unobstructed.

Other objects and advantages of my invention will be apparent from the accompanying drawings and description and the essential features will be set forth in the appended claim.

In the drawings- Fig. 1 is a central sectional view through the pump and its housing with the driving motor shown in side elevational view;

Fig. 2 is an enlarged sectional view taken along the line 2-2 of Fig. 1;

Fig. 3 is an enlarged sectional view taken along the line 3--3 of Fig. 1; while Fig. 4 is a fragmental sectional view taken along the line 4-4 of Fig. 2.

The main pump housing is of generally bullet nose shape having a connecting flange 11 extending radially outwardly from the flared open end of the housing 10. A motor base 12 is provided with a radially extending flange 13 which is bolted to the flange 11 when the parts are assembled by means of a plurality of bolts 14 of which four are used around the circumference in one form of my invention. Through the nose end of the housing 10 is provided an opening 15 into which is threaded a pipe 16 which serves for the purpose of introducing water to the pump from a shallow well or or other source of water. The opening at 15 is narrowed at 15a so as to provide a shoulder 15b against which rests the inlet end of an ejector 17 which comprises an inlet chamber 18, a throat 19 and an expansion passageway 20. Concentric with the throat 19 and spaced slightly therefrom in the usual manner is a jet 21 having an opening into the chamber of the housing 10. The upper end of the ejector 17 abuts against a volute 22 which flares upwardly and outwardly to its outer rim where it is provided with a radially outwardly extending flange 23. The motor base 12 is provided with a machined surface 12a which fits tightly against the surface of flange 23 which is machined to fit it. The motor 24 is provided with a driven shaft 25 which has a threaded connection at 26 with the centrifugal pump impeller 27. This impeller has a hollow neck 28 which registers with the outlet passageway 20 of the ejector. The impeller is provided with the usual series of vanes 29. The shaft 25 is provided with a seal 30 which is held in a truncated conical collar 31 which is rigid with the motor base 12. A helical compression spring 32 between the impeller 27 and the seal 30 holds the latter in p ace.

Means is provided to seal the end of the ejector 17 against the volute 22. This means comprises an annular ring of sealing gasket material 33 received in an annular groove in the flange 20a at the discharge end of the ejector. This sealing ring is pulled up against the volute 22 when the parts are assembled thus providing a good seal at this point.

Means is provided to prevent leakage around the neck 28 of the impeller. This comprises an annular seal of flexible material U-shape in section as indicated at 34. This seal has its lips or legs slightly compressed between the neck 28 and the volute 22 thus providing a good seal at this point.

The discharge from the volute 22 is at the point 35 which discharges the liquid into the housing 10 tangentially. A large portion of the discharge liquid travels around the housing 10 to the discharge 36. This discharge is not properly to be seen in Fig. 1 of the drawings but its approximate location on the near side of the body 10 is indicated by the dot-dash lines 36 in Fig. 1.

To deaerate the liquid in the housing 10, a fin 37 is provided extending radially inwardly from one side of the housing 10 and extending from a point near the nose of the housing to a point near the volute 22 at the other end of the housing. This fin 37 breaks up the flow of the liquid in its circular path inside of the housing 10 so as to release air bubbles therefrom.

Several openings are shown in the sides of the housing 10 and these include a drain 38 closed by a plug; a connection at 39 which leads to a pressure switch which is used to control motor 24; and another opening at 40 to which is normally connected a pressure gauge and which is provided with a reducing bushing which can be removed for the purpose of priming the pump when necessary.

It will be understood that means not shown is provided for energizing the motor 24 so as to drive the impeller 27.

In assembling the pump, the ejector 17' is assembled in the nose end of the housing 10 by means of cap screws 41. The volute 22 is then placed against the sealing ring 33 of the ejector. The motor shaft 25 is passed through the opening in the frusto conical collar 31 and the impeller 27 is threaded to the end 26 of the shaft. The spring 32 is inserted while the impeller is being threaded in position so as to hold the seal 30 in place. The motor base 12 is then connected to the flange 11 by means of the bolts 14 and this holds the parts 10, 17 and 22 in the positions shown in Fig. 1 tightly against the motor base surface 12a. It will be noted that flange 20a provides a shoulder extending radially from the axis of the ejector. This shoulder abuts a similar shoulder on volute 22. When housing 10 is secured to base 12, these two shoulders are pulled tight against each other with sealing ring 33 between them. The ejector 17 and volute 22 are then held in abutting relationship between the housing 10 and the base 12.

By means of the above construction the number of parts is held to a small number and the pump is easily assembled and disassembled by manipulation of the bolts 14.

What I claim is:

In a pump of the class described, a motor having a driven shaft, a base supporting said motor, a pump impeller mounted on said shaft for rotation thereby, a volute surrounding said impeller and abutting said base, said volute having a central inlet and a peripheral outlet, a one-piece ejector having a jet and a delivery passage in registry with said volute inlet, said ejector and volute having mutually abutting shoulders extending radially from the axis of said ejector, there being liquid sealing means between said shoulders, said ejector having an inlet offset from said jet, housing means including a hollow main pump housing open at one end and having a liquid inlet at the opposite end, there being a pressure liquid outlet in said housing near said open end, said housing abutting said ejector with said housing liquid inlet in register with said ejector inlet, said volute outlet and said jet communicating with the hollow of tween said ejector and sealing means against said volute, and betweensaid volute and said base.

References Cited in the file of this patent UNITED STATES PATENTS Ruth July 9, 1946 ,Ruth July 9, 1946 Conery Oct. 10, '1950

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