US2378974A

US2378974A - Mounting means for pump impellers and the like

Info

Publication number: US2378974A
Application number: US547616A
Authority: US
Inventors: Clark D Bower
Original assignee: Fairbanks Morse and Co
Current assignee: Fairbanks Morse and Co
Priority date: 1944-08-01
Filing date: 1944-08-01
Publication date: 1945-06-26
Anticipated expiration: 1962-06-26

Description

June 26, 1945. c. D. BowER MOUNTING MEANS FOR PUMP IMPELLERS AND THE LIKE Filed Au 1, 1944 2 Sheets-Slieet 1 W i l I 1 70 I EJ.

I l i I 27 35 v I J Z9] 28 |H I ll //4 I fzo Z9] 5 23 2b 5| II INVENTOR.

' I (DIRK DBowER. 1 3 BY 2* June 26, 1945. c BQWER 2,378,974

MOUNTING MEANS FOR PUMP IMPELLERS AND THE LIKE Filed Aug. 1, 1944 2 Sheets-Sheet 2 i .2; 11g ,0 t

37 I 29 A A J a 5' W 7/ 4 54- 3o 3 2 INVENTOR. CLARK 11B owza BY v Patented June 26, 1945 MOUNTING MEANS FOR PUMP IMPELLERS AND THE LIKE Clark D. Bower, Pomona, Calif., assignor, by mesne assignments, to Fairbanks, Morse & Co., a corporation of Illinois Application August 1, 1944, Serial No. 547,616

6 Claims.

.My present invention relates to a shaft and hub mounting means for rotary elements, and

more particularly toan improved means for ad- Justably and firmly securing the impeller of a' centrifugal type pump upon a driving shaft.

An object of the invention is to provide a simple, practical and effective means for securing a hub supported element of a rotary machine upon a driving shaft. l

Another object of the invention is to provide an improvement in the manner of adjustably mounting the rotary impellers of a centrifugal type pump in an operative position upon a driving shaft.

Another object of the invention is to provide a positively acting means for adjusting and positioning a number of impellers or propellers of a centrifugal pump upon a driving shaft in such a manner that the impellers may be spaced in proper clearance relation With adjacent cooperating parts when in operation. I

It has heretofore been common practice in the construction of centrifugal pumps, and more especially in the vertical turbine and impeller types having multiple stages, to fasten or position each of the impellers by means of a split bushing that is adapted to receive a nut which serves to move the impeller along the outside tapered surface of the bushing to-thereby tighten thebushing upon the shaft and grip the shaft and thus produce a frictional driving connection between the shaftv the bushing and the impeller. With this prior arrangement it will be obvious that the amount of torque that can be transmitted from the shaft to the impeller will be dependent not only upon the amount of contact between the parts, but

art, and in part pointed out hereinafter in the following description taken in connection with the accompaying drawings, wherein there is shown by way of illustration and not of limitation preferred embodiments thereof.

In the drawings:

Figure l is a vertical sectional view showing th invention as applied to the shaft and impellers of a multiple stage impeller-type pump,

Figure 2 is a fragmentary sectional view showing the details of the invention as illustrated in Figure 1, and v Figures 3 and 4 are fragmentary plan views of the device, looking down along line A-A of Figure 2, and respectively showing the device as provided for operation by an open-end or spanner type wrench.

In the drawing the invention is shown, for the purpose of illustration, as applied t a mul tiple stage submersible pump of the type employing a plurality of impellers that are adapted to be rotated at high speed within a suitable fluid directing housing. As shown in Figur 1, such a pump in the main comprises a driving shaft l0 that is adapted to be driven by a motor (not shown) which is generally located at the top or also upon the character of the contact surfaces between the several parts. In most pumps of this type it is also important that the axial position of the impeller upon its driving shaft be rigidly maintained with reference to the flu d directing shroud or bowl with which the impeller is associated. For example, in centrifugal pumps of the impeller typ having impellers of the semi-open type that rotate in close proximity tov stationary parts, the clearances must necessarily be very small. It is, therefore, a further object of my invention to provide a mean which will establish a flrm driving connection between the impeller and the shaft and also permit of a close adjustment in the positions of the impellers with respect to each other and thus meet the above requirements in a novel and efficient manner.

Other objects and advantages of the invention will be in part evident to those skilled in the a well or the like. In this instance the shaft Ill carries two impellers l l and II that are secured thereupon in accordance with a preferred embodiment of the present invention. In this arrangement the shaft ill will be journaled and supported at its upper end by means of a suitable step bearing that will .prevent any axial movement thereof and, at the points where the impellers H and 12 are mounted, the shaft III will extend through suitable water lubricated and resilient guide bearings l3, l4 and I! which may be of rubber or other type of yielding plastic material. The upper one of these guide bearing I3 is carried by an inner portion of a fluid directing bowl or shroud it that is adapted to be. secured upon the lower end of a discharge pipe I! which leads from the pump. The bowl or shroud I6 is also shown as provided with a plurality of fluid direct-- ingpchannels or conduits 3 through which the fluid may flow upwardly from the impeller ll. At its lower end the fluid directing 'bowl. or shroud It supports a-second somewhat similar bow] or shroud IS in which the guide hearin it is mounted. This bowl or shroud I9 is also provided with fluid directing channels or conduits 20 that serve to direct the fluids discharged by the impeller l2 toa point below the impeller H. Mounted below and secured to the bowl or shroud l9 there is an additional fluid directing shroud 2| that carries the impellers l I and I2 are rotated at high speed, I

they will operate in their respective zones to centrifugally impart movement to a fluid as it passes through the conduits I8, and 22. For efficient operation, it will be understood that the position of the impellers II and I2, with respect to the adjacent lands or channel forming surfaces 24 and 25 of the members l9 and 2!, adjacent which they operate, must be closely maintained. Therefore, in a pump of this type it is desirable to provide a means by which the impellers H and I2 may be adjusted along the shaft Ill and with respect to the cooperating stationary parts of the pump housing. At the same time, this means must operate to firmly secure the impeller or rotary element against any radial or axial displacement after these adjustments have been made.

As is more clearly shown in Figure 2 of the drawings, the invention, in its preferred form, contemplates the provision of an undercut portion or groove 26 upon the shaft III at a point adjacent where an impeller II or i2 is to be mounted. In this arrangement a groove or undercut portion 25 provides what may be termed two oppositely arranged and spaced

shoulders

21 and 28 between which a mutilated nut or split collar 29 may be nablemanpositioned in a tight fitting, but ner. Cooperating with the mutilate nut or spllt collar 29 the impelleris provided with an internally threaded and extending hub portion 30 that is adapted to overlap the mutilated nut or split collar 29 and thus retain it between

th sp shoulders

21 and 28 formed upon the shaft l0. At its other end the impeller has a hub portion II that is adaptedyto provide a relatively tight sliding fit upon the shaft lo at one side of the undercut portion 26, and cooperating with this portion of the hub, the shaft III is preferably provided with one or more Woodruff type of key 32 that engages a keyway 33 formed in the hub portion 3| of the impeller. With the impeller mounted in this manner it will be seen that by turning the mutilated nut or split collar 29 about the shaft l0, it will be possible, because of the external threads thereupon and the internal threads carried by the extending hub portion 30 of the impeller, to move the impeller axially of the shaft in either direction from any given point after the parts have been assembled as shown, and in this way any desired clearance may be established between blades 34 f the impeller and the stationary lands or surfa s 24 or 25 of the pump housing. For the purpose of securing the impellers against any inadvertent or accidental ment, it is contemplated that these members may be provided with hexagonally arranged

surfaces

38 and 31, as shown in Figure 3 of the drawings, or they may be made of a type as shown at 29' and 35' suitable for turning with a conventional spanner wrench by the provision of suitable spaced

notches

38 and 39 in the outer perimeters thereof, as shown in Figure 4 of the drawmgs.

While I have, for the sake of clearness and in order to disclosethe invention so that the same can be readily understood, described and illustrated specific devices and arrangements, I desire to have it understood that the invention is not limited to the specific means disclosed, but may be embodied in other ways that will suggest themselves to persons skilled in the art. It is believed that this invention is new and it is desired to claim it so that all such changes as come within the scope of the appended claims are to be considered as part of this invention.

Having thus described my invention, what I claim and desired to secure by Letters Patent is:

1. Ina shaft and hub securing means of the character described, the combination of a shaft having spaced shoulders formed thereupon, a split externally threaded collar disposed between the shoulders upon said shaft,' a hub carrying member having an internally threaded portion at one end adapted to extend over said split collar and another portion adapted to slidably engage said shaft, a keying means between the latter portion of said hub carrying member and said shaft, and means carried bysaid split collar and engagin the end of said hub carrying member for locking'said parts in an operative position.

2. In-a shaft and hub securing means of the character described, the combination of a shaft having spaced shoulders formed thereupon, a plurality of externally threaded collar forming membersdisposed around said shaft between said shoulders, a hub carrying member having an internally threaded portion at one end adapted to extend over said plurality of externally threaded collar forming members and another portion slidably engaging said shaft, a keying meansbetween the latter portion of said hub carrying member and said shaft, whereby said hub carrying .member may be adjusted axially along the shaft by a turning of said plurality of externally threaded collar forming members about the shaft.

' member having an internally threaded portion displacement along the shaft III, the invention j at one end adapted to extend over said externally threaded split collar and'another portion slidably engaging said shaft, a keyin'g means between said latter portion and said shaft, whereby said hub carrying member may be adjusted axially along the shaft by a turning of saidsplit collar within the internally threaded and extending end of said hub carrying member, and means carried by said split collar and engaging the end of said hub carrying member for locking said parts in a fixed position. 1

'4. In an impeller supporting shaft, the combination of a driving shaft having a groove formed thereabout at a point corresponding to the location of an impeller to be mounted thereupon, an externally threaded split nut disposed in the groove of said shaft, an impeller slidably mounted upon said shaft and having an internally threaded overhanging portion into which said. split nut may turn, a keying means between said shaft and said im ller, whereby said impeller may be adjusted axially along'the shaft with respect to-said groove by a turning of said externally threaded nut about the shaft, and means for securing said split nut against turning in the overhanging portion of said impeller.

5. In a shaft and hub securing means of the character described, the combination of a shaft having a shoulder extending therearound, a split externally threaded collar disposed upon said shaft in cooperating relation with said shoulder,

a hub carrying member having an internally threaded portion at one end adapted to extend over saidexternally threaded split collar and another portion adapted to slidably engage said shaft, a keying means between the latter portion of said hub carrying member and said shaft, all whereby said hub carrying member may be ad- J'usted axially along said shaft by a turning of said-split collar within the internally threaded 6. In a shaft and hub securing means of the character described, the combination of a shaft having a fixed shoulder forming means extending portion of said hub carrying member, and means for finally securing said split externally threaded collaragainst any turning within the internally threaded portion of said hub carrying member.

therearound, a split externally threaded collar disposed upon said shaft in cooperating relation with said shoulder forming means, a hub carrying member having an internally threaded portion at one end adapted to extend over said externally threaded split collar and another portion adapted