US2514865A - Pumping unit - Google Patents

Description

Jul 11, 1950 H. HORNSCHUCH PUMPING UNIT' Filed April 15, 1945 Hi5 ATTOR-N EY.

liquid enters the supply chamber.

' fromv the pump to the port 29. r flange 25 at the upper end of the head lies within a depression 22 in the casing 2|, and a sealing Patented July 11, 1950 PUMPING UNIT Hanns Hornschuch, Easton, Pm, assignor to Ingersoll-Rand Compan poration of New Jersey y, New York, N. Y., a cor- Application April 13, 1945, Serial 120.588,!

This invention relatesv to pumps, and more particularly to a pumping unit of the centrifugal,

- multi-stage type.

One object of the invention is to render all parts of thepumping unit readily accessible for the purpose of making inspections and repairs.

Another object is to simplify the construction of the parts comprising the pumping unit and thereby maintain the cost of construction to a minimum.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawings accompanying this specification and in which similar reference numerals 7 refer to similar parts,

Figure 1 is a side elevation of the pumping unit,

Figure 2 is a similar view of the centrifugal pump and a portion of the motor serving to drive it, and

Figure 3 is an elevation, partly in section, of

, the pumping unit.

Referring more particularly to the drawings, the pumping unit, designated in general by 20, comprises a vertical outer, cup shaped casing 2!, a centrifugal pump 22 within the casing 2|, and a motor 22 positioned above the pump for driving it. Only the lower end portion of the casing of the motor 22 is shown and said casing is seated upon adistance piece 24 supported by the casing 2|.

2 Claims. (Cl. 103 -98) leakage of liquid through the opening 22 to the exterior of the casing 2|. A sealing member 28 is I also interposed between the bottom of the head and a shoulder 22 in the opening 22 to prevent the leakage ofv discharge liquid from the passage 24 back into the supply chamber 22.

The sealing members 21 and 22 are compressed between the head 22 and the shoulders by bolts 40 threaded into the casing 2| and extending 'The casing 2| is of cylindrical shape and its interior constitutes a supply chamber 25 for liquid. In the side of the casing, near the upper ensl thereof, is an inlet port 26 throu h which the The liquid is delivered to the port 22 by a supply conduit 21 secured to the casing 2! by bolts. The casing 2! also has a discharge port 22 near its upper end for the passage of liquid discharged by the pump 22 to a conduit 22 secured to the casing by bolts 2!.

The centrifugal pump 22 is of the multi-stage type and is held suspended in a vertical position within the supply chamber 22 by a head 22 lying within anopening 22 at the upper end of the casing 2| and forming the sole support for the pump 22. The head 22 serves as a cover for the opening and is of a depth to overlie the discharge port 22 and has a passage 24 to convey the liquid An annular member 21 is interposed between the flange and the bottom of the depression 22 to prevent the through a flange I on the distance piece 24, said distance piece being provided with an annular rib 22 that seats upon the flange 25.

The portion of maximum diameter of the centrifugal pump 22 is sufilclently smaller than the diameter of the opening 22 to enable the pump, as assembled on the head 22, to pass readily through the opening. .In addition to the head 22 it comprises, as casing parts, a plurality of channel rings 42 and a head 44 at the lowermost end of the pump. The channel rings 22 are clamped between the heads 22 and 44 by bolts 45 extending-along the exterior of the channel rings and threaded atone end into the underside of the head 22. Thebpposite ends of the bolts extend through lugs 46 on the periphery of the head 22, and nuts 41 threaded on the ends of the bolts seat against'the lugs to press the casing parts against each other.

The channel rings 22 are identical. Their opposed surfaces and the surfaces of the heads 22 and II opposing the end channel rings are recessed to define pumping chambers 48, 49, 50 and SI and channels 52 for conveying liquid from one pumping chamber to the other and from the final stage pumping chamber 2| into the passage 24. The pumping chambers 48, 42, i0 and BI contain, respectively, impellers I2, 54, i5 and 66 for pumping the liquid from the supply chamber 22 to the discharge line of the pump.

The impellers are arranged upon and may be interlockingly secured, in any well known manner, to a vertical shaft I! that extends through the head 22 and the distance piece 24 for connection with the shaft of the motor 22. The lower end 22 of the shaft is ioumaled in a bearing is arranged in a hub 22 that lies below the head It to permit the free fiow of liquid from the chamber 22 to the first stage impeller 53 and is supported by arms 6| shown as being formed integrally with the head and the hub 20.

To the end that the surfaces of the bearing and the shaft end 22 may be lubricated by a portion 4 of the liquid being pumped, one of the arms is provided with a passage 22 that leads from the QIIQMU discharge passage I! of the first stage pumping chamber 48 into the bore of the bearing 69.

Inasmuch as the eyes of all the impellers are located on the lower sides of the impellers it is essential that means be provided for counterbaiancing the downward thrust on the rotor. To this end the head 32 is provided with a bore 63 that opens into the upper end of the final stage plnnping chamber BI, and a mechanical seal 66 in the bore 63 serves to reduce the pressure of the liquid acting upon the upper side of the impeller II in suitable degree to balance the upward thrust of the suction pressure. The sealing device ll may be of a known type and comprises the usual rotary and stationary members ti and II, respectively, that cooperate with their opposed surfaces to valve liquid from the bore 63 to a cone of lower pressure, in the present instance, into a passage II, in the head 32, opening into the supply chamber 26. V

The stationary component of the sealing device is arranged in the head, and the rotary component is disposed upon a wearing sleeve 68 on the shaft 51. The wearing sleeve seats against the adjacent end of the impeller 66 and is held thereagainst by a second sleeve 69 that encircles the shaft and'is pressed against the sleeve II by a nut ll threadedly connected to the-shaft.

' 4 upper end thereof, inlet and discharge ports in the side of the casing adjacent the opening, a vertical centrifugal pump in the supply chamber in spaced relation with the casing to pump liquid from the supp y chamber to the discharge port, a head for the pump to forma closure for the opening and to form the sole support for the pump and having a passage to convey the discharge liquid from the pump to the discharge no 2. In a pumping unit, a vertical outer casing having a supply chamber and an opening in the upper end thereof, a port at the upper end of the casing for the admission of liquid into the supply chamber, said casing having a discharge port, a cover for the opening extending into the casing across the discharge port and having a passage to communicate with the discharge port, sealing members in the opening above and below the point of communication of the passage with the discharge port to prevent leakage of discharge liquid through the opening tothe exterior of the outer casing and into the supply chamber, a vertical inner casing in the supply chamber of smaller diameter than the supply chamber and the opening and having an inlet opening at the lower end thereof, bolts for securing the inner In order to preclude the leakage of liquid from t the passage 61 through the bore 63 to the exterior of the head 32, packing material H is disposed about the sleeve 69 and compressed by a manufactured of special alloy metals. The centrifugal pump may, moreover, be readily removed from the assembly for the P p se of making inspections and repairs without requiring the disconnection of the inlet and discharge conduits and hence the breaking of the seals between the conduits and the casing.

I claim:

1. In a pumping. unit, a vertical outer casing having a supply chamber and an opening at the casing to the underside ofthe cover, pumping chambers in the casing, impellers in the pumping chambers for pumping liquid from the supply chamber to the discharge port, a shaft for the impellers, a bearing on the inner casing for the shaft, and a passage in the inner casing for conveying liquid from one of the pumping chambers to the bearing for lubricating said bearing.

' HANNB HORNSCHUCl-L- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 742,231 Rateau Oct. 27, 1903 1,758,175 Schaer May 13, 1930 1,997,824 Hollander Apr. 16, 1935 2,376,528 Wislicenus May 22, 1945 2,395,793 Stratford et al. Feb. 26, 1946 FOREIGN PA'I'ENTB Number Country Date

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