US1734000A - Centrifugal pump - Google Patents

Description

1929- I 'M. SPILLMANN 1,734,000

CENTRIFUGAL PUMP I Filed March 30, 1925 IIIY INVENTOR Patented Oct. 29, 1929 UNITED STATES PATENT OFFICE MAX SPILLMANN, .OF BICHFIELD, NEW JERSEY, ASSIGNOR TO WORTHINGTON PUMP AND MACHINERY CORPORATION, OF NEW YORK, N. Y., A. CORPORATION 01 V13- GINIA.

CENTBIFUGAL PUMP Application filed latch 80, 1925. Serial 1T0. 19,197.

This invention relates to improvements in centrifugal pumps.

It is the especial object of the invention to provide a pump of this type which will be strong and durable and which may be employed with advantage in handling crude petroleum' and its products throughout the "arious stages of modern oil cracking and refining processes. The present pump, while having all the advantages of displacement pumps as now constructed for withstanding the high temperatures and pressures encountered in this use, is much cheaperto manufacture, and is fully as efiicient as such displacement pumps, or even more so, and the construction is suchthat the operating parts are readily accessible for inspection, cleaning, replacement or repair.

In the accompanying drawings forming a part of this specification, there is shown a pump embodying all the features of the present invention in a preferred form, and this construction will now be described in detail in connection with said drawings, and the,

novel features of the invention then be specifically pointed out in the claims.

In the drawings- Figure 1 is a view partly in elevation and central longitudinal section; V

Figure 2 is a side elevation of the pump body; and

Figures 3 and 4 are sections, respectively, on the lines 3-3 and 4-4 of Fig. 2.

Referring now to the drawings, 10 indicates a metal pump bod which, for the .necessary strength and dura ility under the high temperatures pressures. encountered in handling petroleum and its products durin the various steps of modern oil cracking an refining processes, is preferably a steel forging in which are formed all the chambers and passages hereinafter referred to. It will be understood, however, that cast steel may be substituted for such a steel forging, and this ing with a suction c'iamber 12 located cenpreferably and as shown face each other and are mounted on shaft 19, their eyes, as above stated, being in communication with common suction chamber 12. As shown, also, the impellers have their outlets turned so as to deliver in a substantially axial direction toward each other and into their respective discharge chambers, thus not only effectually balancin axial shaft thrust, but'enabling the outside rfimensions of the pump to be materially reduced. The sides of the pum body 10 are closed by plates 18 which re erably are steel forgings and which may e secured to the body 10 in any suitable manner, or by screw bolts, as shown, and thus be readily re- I movable for access to the interior of the pump body for inspection, cleaning and repair or replacement of parts. As shown,"the plates 18 have integrally formed therewith the stuffing boxes and supports for the shaft bearings hereinafter referred to. The shaft 19 may advantageously be mounted in ball bearings, indicated generally at 20, supported by standards21 mounted on the base 22. While bearings of other types may be substituted for those shown, the present bearings will not be affected by the high temperatures and may therefore be used with advantage in place of bronze or Babbit metal bearings which have relatively low melting points. A driving pul- Icy-23 is shown for driving the shaft, but ohviously the shaft may be driving in any other suitable manner and, if desired, be direct con- I nected to a prime mover. The impellers may not be turned to deliver axially, but deliver 1 radially, as usual in centrifugal pumps. The

walls-of the discharge passages also may be v 50 specificall its productsin the various stages of the refining processes, thus resulting in long life of these parts and enabling uninterrupted operation of the pump. a To secure this result, the shaft and stufiing boxes are efliciently cooled by maintaining a supply of cold oil in chambers 3, inlets 4 thereto being rovided which may be placed in commumcation with any sultable source of supply. Preferably, however, the cold oil in the chambers 3 is maintained under a pressure in excess of the pressure in the suction chamber 12, so that whatever leakage does occur-from the chambers 3 will be toward the im ellers and consequently be carried off 5 in the ischarge. A separate pump or pumps of any desired type, but preferably a dislacement pump or pumps (not shown) may be employed for thus maintaining cold oil under pressure in the chambers 3. Leakage 0 along the shaft in the o posite or outward direction and through t e stufiing boxes 2, may-be effectually prevented by packin of any referred type. This means or coo in the arings and avoiding the passage 0 as hot 1i uid to the stuffing boxes is preferably used,

ut other cooling arrangements may be employed.

While the present construction has been described as especially suitable for use in han- 40 .dling liquids at high pressures and temperatures, it will be understood that the pum is well adapted for other uses, and that var1- ous changes in the construction and arrangement of arts shown and described may be 5 made while still retaining the invention defined by the claims. The broader features of theinvention may be used in a single imller ump, and such a pump is intended to e inc uded within such claims as are not K limited to impellers on opposite sides of t e pump body.

What is claimed is: 1. A centrifu a1 pump, comprising a pump body formed 0 a single block having therein impeller chambers and dischar e chambers on opposite sides of the bloc a central suction chamber and suction passage connecting therewith and discharge passages connecting with said discharge chambers,

00 sideplates arranged to close said chambers,

' and an impeller shaft mounted in the side plates and carrying impellers having their suction openings facing each other, said impellers lying in planes outside the discharge M chambers and having their outlets turned to or cooldischarge at an angle to their plane of rocen r1 uga pump,.c0mpr1s1ngapump body formed of a single block having there in impeller chambers and discharge cham-. bers on opposite sides of the block, a central suction chamber and suction passage connecting therewith and discharge passages connecting with said discharge chambers, side plates arranged to close said chambers, and an impeller shaft mounted in the side plates and carrying impellers having their suction o nings facing each other, said impellers lying in planes outside the discharge chambers and having their outlets arranged to deliver in a substantially axial direction toward each other.

3. Acentrifu l ump for hot liquids, comprising a pump y formed of a single block aving therein impeller chambers and discharge chambers on opposite sides of the block, a central suction chamber and suction passage connectin therewith and discharge passages connecting with said dischar e cham ers, side plates arranged to ClOSGSflld chambers, an impeller shaft mounted in the side plates and carrying impellers having their suction o nings cing each other, said impellers aving their outlets turned to discharge at an angle to their lane of rotation, and chambers on the si e plates adjacent the shaft openings arranged to en'-"-= close the shaft and receive cooling fluid under pressure in excess of the pump ressure to prevent leakage of the hot liqui at the shaft bearings.

4. A centrlfugal pump, comprising a pump body formed of a solid block and having impeller chambers formed in the o posite sides thereof, and having annular disc arge chambers positioned at one side and inwardl from the impeller chambers, said body having an axial bore forming a suction chamber communicating with said impeller chambers and having discharge passa es communicating tangentially with said discharge chambers and gradually converging towards the discharge outlet in such manner as to provide convergence of the discharge streams at a relatively small angle.

5. A centrifugal pump, comprising a pump body formed of a solid block and having impeller chambers formed in the opposite sides thereof and having annular discharge chambers positioned at one side and inwardly from the impeller chambers, said body having an axial bore forming .a suction chamber communicating with said impeller chambers and having discharge passa es communicating tangentially with said discharge chambers and gradually converging towards the discharge outlet in such manner as to provide convergence of the dischar e streams at a relatively small angle, side p ates closing said impeller chambers, and impeller shaft mounted in the side plate, and chambers on the side plates adjacent the shaft openings arranged to enclose the shaft and receive cooling fluid under pressure in excess of the pump pressure to prevent leakage of liquid from the impeller chambers at the shaft bearings.

In testimony whereof, I have hereunto set my hand.

MAX SPILLMANN.

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