US1650522A - Centrifugal pump - Google Patents

Description

Nov. 22, 1927. 1,650,522

J. H. JOHNSTON CENTRIFUGAL PUME' Filed Jan. 12. 1927 2 Sheets-Sheet 1 Nov. 22?, 1927. 1,650,522

J. H. JOHNSTON v CENTRIFUGAL PUMP f Filed Jan. 12. 1927 2 Sheets-Sheet 2 Digi- A Y Tja-E55y INVENTOR Patented Nov. 22, A1927'. i

Nil-ED- sTATEs PATENT OFFICE.

JAMES AMILTON JOHNSTON, F RAYNE, LOUISIANA, ASSIGNOR TO STAMM-SCHEELE MANUFACTURING CO., LIIYIITELII), 0F RAYNE, LOUISIANA.'

GENTRIFUGAL PUMP.

Application led January 12, 1927. Serial No. 160,655.

My invention relates to the art of centrif- -ugal pumps and particularly to that type in which the pump is suspended or set into a well casing and embodies an impeller with a line shaft enclosed in a suitable casing through which the. bearinglubricant is passed and which protects thebearings from sand and detritus. Usually such pumps are made with the line shaft, the shaft casing and the discharge casing concentrically arranged and vcomposed of a series of sections with shaft bearings located at the juncture of the casing sections, the bearings being composed of spiders carried by the discharge casing and screw coupled with the adjacent line shaft casing sections with provision for placing the line shaft casing sec- .tions under longitudinal tension to mainas to enable the manufacturing cost to be lowered, to enable the' pump to be assembled with greater convenience, vto provide fora perfect arrangement of the shaft bearings, shaft casing and discharge casing,` sectionby-section, as the parts are assembled, to

obtain a sealing of the line shaft casing without the necessity of screw `coupling it with the bearings, andlto provide for eX- pansion and contraction due to temperature lvariation without causing the bearings to under o a- Asliding movement with respect to their supports.

With other objects that will be clear to those skilled in-the ,art the invention resides in those novel features of construction, combination and arrangement of parts, all of which will be first fully described, then be particularly pointed out in the appended claims, reference being had vto the accompanying drawings, in which Figure l is a vertical half side elevation and half central longitudinal section of a Y pump employing my invention.

Figure 2 is anl enlarged centra-i vertical longitudinal section of the upper end of the same.

Figure 3 is an enlarged detail vertical longitudinal section of two bearing spiders most well casing section is bolted' down.

I Figure 4 is a similar view after the sections have been bolted together and showing how the packing is compressed at the ends of the lineshaft casing sections durmg the act of clamping thesaid casing sections together.

In the drawings in which like numerals of reference designate like parts in all the figures, 1 represents the well casing which 1s provided with the usual cover 2 on which the pump head 3 is mounted. The pump head 3 carries the usual water jacketed head bearing 4 in which the head section 10 of the line shaft is journalled, that section carrylng the usual thrust plate 5. A thrust bearing 6 is provided'and a drive pulley 7.

Oil is transmitted to the bearings through avtube 8 and an air vent 9 is provided in the packet of the head bearing for the usual l purposes. 11 designates the impeller adjust- :ilgg nuts screwed on the head shaft section l2 designates the impellers mounted with- 1n the impeller casing 13 on a stub shaft 14, lthe .casing being providedA with a bear- `and the associated parts before the uppering neck 15 in which is a bushing 16 for the stub shaft. The stub shaft is `coupled to the line shaft (the lineshaft being made in sections coupled together as at 18) by a suitable coupler 18.l

19 represents the discharge casing which is provided with the usual coupling flanges '20 (secured to the casing sections in any d esired manner as for instance by threading).

All of theforegoing parts may be of the usual construction except that the coupling flanges 20 are recessed at 21 to receive the rims"23 'of the bearing spiders 22, the bearing spidersv having bearing portions 24 for the line shaft. These bearing portions 24 at their upper and lower ends are milled to provide grooves 25 to lreceive the ends of the line shaft casing sections l27 and to receive suitable packing rings 26 composed of cork, asbestos, rubber o r any other suitable material.

The lower end of the lowermost line shaft casingsection 27 has a pressed fit 'onto the up er end of the neck bearing bushing 16.

he head bearing 4 has a downwardly extended portion 28 bored to receive the upper end of the uppermost line shaft casing section and counterbored to receive suitable packing rings 29 and a gland nut 30 in order to enable a water seal to be effected at this place.

In practice the length of the line shaft casing sections is so designed with relation to the discharge casing sections and to the bearing spiders that when the parts are brought together and before the discharge casin sections are clamped home (see Figure 3 the packing rings 26 will be engaged by the ends of the line shaft casing sections but will not be under comprssion. However, when the discharge casing sections are bolted tight the bearings will be brought closer together with the result that the packing rings 26 will be placed under compression and effect a tight seal. Byreason of the more or less resilient nature of the packing rings 26 variations in the expansion of the line shaft casing over that of the discharge casing will be taken up in the packing rings 26, it being understood, of course, that this variation ordinarily is but slight.

The de th of the grooves 25 and the thickness of t e packing rings 26 may be varied to suit conditions met with in practice, it being understood, of course, that the deeper the grooves -and deeper the acking rings the greater allowance for variations in expanslon of the pipe sections is provided for.

In assembling the pump the impeller unit includinflr the impeller and impeller casing is assembled and the first line shaft section is coupled to the impeller stub shaft. Next the lower discharge casing section and the lower line shaft casing section are put into position, after which the 'first bearing spider is set in place. Of course, at this itme the rim of the bearing spider will not seat down tight on the p charge casing. After this the next line shaft section, discharge casing section and line shaft casing section are put in position and upon bolting the fianges of the two discharge casing sections together they will effect a tight grip of the rim of the bearing spider and at the same time force it downwardly to an extent sufficient to compress the lowermost acking ring 26 and effect a tight seal of t e lowermost line shaft casing section. In a similar way, theupper sections of the line shaft, line shaft casing, discharge casing and bearings are assembled to the top of the well when the pump head parts are assembledin the usual manner,

. thus completing the assembly and placing the pump in condition for operation.

From `the foregoing description, taken in connection with the accompanying drawings, it is thought that the complete conllowermost flange of the disstruction, operation and` advantages of my invention will be clear to those skilled in the art to which it relates.

What I claim is:

l. In centrifugal umps, a sectional discharge casing, line s aft bearing spiders secured between adjacent sections of said casing, a line shaft and line shaft casing Y sections located between adjacentbearing spiders, said bearing spidersincluding bearing members having grooved ends to receive the ends of the line shaft casing sections, and packing in the grooves.

2. In centrifugal pumps, a sectional discharge casing, line shaft bearing spiders secured between ad'acent sections of said casing, a line sha t and line shaft casing sections located between adjacent bearing spiders, said bearing spiders including bearing members having "rooved ends to receive the ends of the iine shaft casing sections, and packing in the grooves, said line shaft casing sectionsbeing of such length relative` to the discharge casing sections that when the discharge casing sections are secured together the bearin spiders will be drawn toward the line sha t casing ends tol compress the packing.

3. In centrifugal pumps, wherein is provided aline shaft, an impeller and its casing, and a pump head; a sectional discharge casing having coupling flanges at the ends of the sections and means to draw said flanges together, said flanges being recessed, a set of line shaft bearing spiders with portions held in the recesses of the flanges, and portions located adjacent the line shaft and provided with recesses, packin material in said lastnamed recesses, and 11ne shaft casing sections set into said last named recesses and engaging said packing.

4. In centrifugal pumps wherein is provided a line shaft, an impeller and its casing, and a pump head; a sectional discharge casing having coupling flanges at the ends of the sections and means to draw said fianges together, said fianges being recessed, a set of line shaft bearing spiders with portions held in the recesses of the flanges, and

portions located adjacent the line shaft and provided with recesses, packing material in said last named recesses, and line shaft casing sections s et into said last named recesses and engaging said packing, said line shaft casing sectlons being of a length whereby when the bearing spiders are .clamped tight between adjacent flanges they will compress the packing to effect a seal.

5. In centrifugal pumps of the kind employing an impeller, a line shaft, a sectional discharge casing and a sectional line shaft Ycasing, shaft bearing spiders having rims rigidly secured to the discharge casing'and having shaft bearings provided with shaft casing receiving grooves, packing elements retoma-- in said grooves against which the ends of the shaft casing engage, said shaft casing sections being so proportioned that adjustment of the securing means will apply compression force between pairs of bearings and the intervening shaft casing sections and packing elements substantially as and for the purposes specified.

6. In combination with the discharge casing, 'the sectional line shaft casing and the shaft bearing spiders of a centrifugal pump; of means to secure the spiders rigidly to the discharge casing and cause them to press toward the ends of 'the adjacent shaft casing sections, and yieldable bodies interposed between said ends and said bearing spiders to effect a seal and permit expansion and contraction.

7. In centrifugal pumps, an impeller, an ilnpeller casing, a sectional discharge casing, said impeller casing including a shaft bearing neck with bushing, a sectional line shaft casing, one of the sections of which is set over said bushing with a tight lit, a pump head at the top of the discharge casing, a line shaft extending from the impeller to the pump head, means at the pump head for driving the line shaft, a series of line shaft bearing spiders rigidly located within the discharge casing and having bearing portions for the shaft, said bearing portions having upper and lower grooves with packing rings contained therein, and a sectional line shaft casing the ends of the sections of which lie in said bearing grooves in pressure contact with the packing.

8. In centrifugal pumps, an impeller, an impeller casing, a sectional discharge casing, said impeller casing including a shaft bearing neck with bushing, a sectional line shaft casing, one rof the sections of which is set over said bushing with a tight fit, a pump head at the topof the discharge casing, a line shaftextending from the impeller to the pump head, means at the pumphead for driving the line shaft, a series of line shaft bearing spiders rigidly located within the discharge casin and having bearing portions for the s aft, said bearing portions having upper and lower grooves with pack ing rings contained therein, and a sectional line shaft casin .the ends of the sections of which lie in sai bearing grooves in pressure contact `with the packing, said pump head 4including a recessed portion to receive' the upper end of the uppermost gline .shaft casing section, and packing rings and gland nut for sealing the upper end of the uppermost line shaft casing section in 'said pump `head recess.

JAMES HAMILTON JOHNSTON.

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