US1606868A - Pump - Google Patents

Description

Nov. 16 1926. 1,606,868

H. M. cHAsE PUMP Filed Nov. 4, 1924 2 SheetsfSheet 2 r--r--l--F L I` j l A Patented Nev. 15, 192th UNITED STATES HENRY M. CHASE, 0F HOLYOKE, MASSACHUSETTS, ASSIGNOR TO WORTHIIGTN PUMP AND MACHINERY-CORPORATION, F NEVI Y'ORK, N. Y., A CORPORATON OF VIE.'-

GINIA.

PUMP.

Application lfiled November 4, 1924. Serial No. 742,722.

T his invention relates to improvements in pumps.

rlhe invention aims especially to provide a simple, cheap and durable high pressure pump which man be used with advantagein handling hot liquids, Such, for example, as are encountered in the production of gasoline from heavier petroleum products in modern c aching processes. Briefly stated, the present pump comprises novel arrangements for preventing the working parts of the pump, with the exception of the valve service, from contact with hot liquid, with efficient means for protecting the plunger rod stuiiing box packing and cooling that part of the plunger rod which on the outstrokes is exposed to the atmosphere, thereby greatly prolonging the continuous operation of the pump and avoiding danger' of fire caused by flashing of the hot oil adhering to the plunger rod. e

For a full understanding of the invention, a detailed description of preferredvand modified constructions embodying the invention will now be given in connection with the accompanying drawings forming a part of this specification, and the features forming the invention then be specifically pointed out in the claims.

1n the drawings- Figure 1 is a top plan view of the improved pump in its preferred form;

Figure 2 is a vertical central section thereof, partly in elevation;

Figure 3 is a view similar to Fig. 2-.of a modii'ied construction, and y Figures Ll and 5 are, respectively, a side elevation, and an end elevation partly in section, of a further modification. v

Referring now to the drawings, and particularly to Figs. 1 and 2, the pump `shown by way of illustration is ofthe type known.A

as a block pump, the body of which as usual is formed from a single block of metal, such as forged steel, indicated at A. The pump is preferably of the tandem type, in which the plunger bores 21 are formed at each end of the block and preferably in longitudinal alinement.' In the bores 21 are mounted liners 2 2, in which single-acting plunger-s 23 are mounted and actuated by plunger rods 24 passing through `stufling boxes 25, such rods being connected to crossheads 26, which latter may be connected to and reciprocated by any suitable orwellknown mechanism. rllhe crossheads 26 are preferably and vas shown connectedtogether by tierods arranged to slide 'in guides 23, so that as one of theA plungers 23 is making its suction stroke the other plunger will be making a discharge stroke. Extensions 29 in each of the plunger bores 21 are provided which, in e'ect, forni pulsation chambers. These extensions are intersected or' cut into by the suction and discharge valve bores. the former beingvindicated at 1 andy the latter at 2. The suction valve bores cut into a suction chamber 3 which is commento' both pumps. rEhe discharge valve bore 2 of each pump intersected by a single discharge passagel common to both pumps, such passage in the present case being shown as formed at a right angle to the bores '2, while the passage et is preferably'formed over a partition 5 ,which separates the two plunger chambers or Vextensions 29 thereof, although this particular Varrangement of the bores kand passages is not essential. Vhilmof course, anydesired type of valve service suitable for a pump to be used with hot liquids may be provided, preferably and as shown valves ofthe ball type 6 are employed, with cages 7 held down by spindles 3 extending through and having threaded engagement with plugs 9 screwed into the pump body, loch nuts 10 being provided for holding the spindles 8in adjustedposition. n

The stuffing boxes 25 and their packings and theplunger rods 24 are eniciently cooled andprotected from direct contact with hot liquid being pumped by providing clearance chambers at the ends of the plunger bores 21 on the dead sides of the plungers 23, such chambers, for the purposes of the present description, being hereinafterv refer-red to as surge chambers, indicated gen- Y erally at 11. An opening 15 in the Vplunger bore of the pump at the left hand end of Fig. 2 is connected by a pipe 1G which is tapped into a similar opening 17 on the dead-side of the plunger in the bore of the pump at the right hand end vof Fig. 2, and on this pipe is mounted a cooler 18 `of any suitable or preferred type, into which the cooling medium may be introduced and Withdrawn at the openings 19. A small opening 12 communicating with apassage 13 leading to the suction chamber 3 or other suitable point below the suction valves 13, isY provided on one of the pumps, shown as the left hand pump, thus maintaining the body of Vliquid lin the surge chamber under suction pressure. The passages 12, 13, like the valve bores, plunger chambers and suction and d1s charge passages, as usual in pumps ot' this., type` may bebored in the pump body A, and

to facilitate suchboring ot the Ypassages 12, 13, openings may be formed Vinthe pump body A which may be sealed by `screw plugs 14. Y Y

l? rom the foregoing it will be noted that as the plungers 23 make their strokes the liquid will be circulated between the surge i chambers, -and that'such liquid will bel et-v Vilhile a tandem pump similar in con-k struct-ion to that shown in Figs. 1 and 2 may have the make-up connection for supplying the surge chambers connected to the discharge side of the pump, as shown in Fig. 3, the connection tothe suction side,

Vas'above described, is preferable Jfor the reasons hereinafter stated. In the modified construction oli' Fig. 8, in which corresponding numerals indicate parts similar to those of Fig. 2, the surge chamber 11 on Vthe dead side ol the plunger 23 ofthe pump at the left hand end ot Fig. 3 has the opening 15 therein intersected by a bore 30 which intersects discharge passage 4 at its opposite end, so that the make-up liquid is taken from the discharge line instead oi the suction side ol the pump. The operation of this modilied construction is otherwise practically the same as above described with respect to Figs. land 2.

It will be understood that the connection to `the suction side of the pump, for maintaining the body of liquid in the surge cham bers, may be used, also, in pumps other than of the tandem type, and such, for example, as shown in Figs. l and 5, which show a pump of the triplex type comprising a battery oi three pumps (l mounted in any suitable manner in a framework D. The plunger rods 31 are operated through suitable crossheads and crank rods secured to shaft Vwheel driven by pinion 36 mounted on' shaft 37 extending through the frame, the latter f shaft being driven in, any suitable manner, or as shown by a belt-driven pulley 38 of the 'last and loose type. In Fig.

5 it will be noted that each of thcpumps` Vwith guards or cages similar to those shown in `Figs. `2 and'l. As in the case ot the latter tigures, also, the plunger bores, pulsation chambers, valve bores and the suction and discharge chamber Vand passage may be formed in ya single compact block ol lorg'ed steel, so asto efficiently withstand the high pressures for Vwhich the pump'is intended. In order that the plunger rods 231 and their stutling boxes may be eii'ectively cooled, each ot the cylinder or plunger bores is made of such length as to provide a substantial clearance on the dead sides oi' the plungers, and Athese clearance spaces, for the purposes of this description, will be termed surge chambers, indicated generally at 42. Liquid isdrawn into there chambers l2 by Vway ot' pipes al, which may be connected to a Tconuection towhich liquid is supplied by a downwardly extending pipe 43 Vtapped into thepunip casing below the suction valves or into the suction line, as preferred; The pipes 42', at their other ends, are connected to annular chambers la surrounding the plunger rod stutng bores. the latter vbeing mounted in the cylinder heads 15. TvVhile a cooler oli any well known or preferred type may be employed in either thcsurge chambers or elsewhere, preferably and as shown a cooler 417 mounted on the pipes 42 is provided. l N ith this arrange ment, the plunger rods will work in a comparatively cool liquid medium, which will also protect the stulliing box packing. The cooling ot the plunger `rods is important, because it prevents danger ot'lire caused by flashing 0f the hot oil adhering thereto when exposed to the atmosphere on the outstrokes of the plungerv rods.

In al1 of the constructions above described, it is preferable that theconnection `forV maintainingthe liquid supply in the surge chambers shall beto the suction side of the pump. This because suchal connect-ion provides for the return to the suction of any leakage past 'theplungera and also provides for the maintenance of the suction pressure on the dead sides of the plungers, which, in pumps used in modem cracking processes, is frequently very high, while the head against which the oil is pumped is usually low and there may be but a small pressure differential between suction and discharge. In the present arrangement, this suction pressure is maintained in the body of cool oil on the dead sides of the plungers, therefore, so that the load carri-ed by the driving parts and the plunger' rods, and whichV depends upon the difl'erence in the pressures on the opposite sides of the plnngers, mayy be quite small.

It will be understood that the invention is not limited to a pump in which the chambers and passages are formed in a single block oitl metal, and that various changes may be made in the details of construction and arrangement ot parts snown and described, while retaining` the invention deined by the claims.

`What is claimed is:

l. A pump for hot liquids, comprising a plunger bore. a single-acting plunger arranged to work in said bore and actuating means for said plunger, a plunger rod stuit'- ing box, a surge chamber in the plunger bore between the stuffing box and the dead side of the plunger, and a connection between the suction side of the pump and the surge chamber.

2. A pump tor hot liquids, comprising a plunger bore, a single-acting plunger arranged to work in saic bore and actuating means for said plunger, a plunger rod stun"- ing box, a surge chamber in the plunger bore between the stui'ling box and the dead side of the plunger, a connection between the suction side of the pump and the surge chamber, and means for cooling the liquid supplied to the chamber.

8. A tandem pump for hot liquids, comprising alined plunger bores, single-acting plungers arranged to work in said bores and means for actuating said plungers, surge chambers on the dead sides of the plungers, and a connect-ion between said surge chambers.

4. A tandem pump for hot liquids, come prising alined plunger bores, single-acting plungers arranged to Work in said bores and means for actuating said plungers, surge chambers on the dead sides of the plungers, a connection between said surge chambers, and means for cooling the liquid supplied to the surge chambers.

5. A tandem pump for hot liquids, comprising alined plunger bores, single-acting plunger-s arranged to work in said bores and means for actuating said plunger-s, surge chambers on the dead sides of the plunger-s, a connection between said surge chambers, and a connection between the surge System and the pump for supplying liquid to said system.

6. A tandem pump for hot liquids, comprising alined plunger bores, single-acting plungers arranged to work in said bores and means for actuating said plungers, surge chambers on the dead sides of the plungers, a connection between the surge chambers, and aconnection bet-Ween the surge system and the suction side of the pump for supplying liquid to said system.

7. A tandem pump for hot liquids, comprising alined plunger bores, single-'acting plungers arranged to Work in said bores and move in unison with each other, means for actuating said plungers, surge chambers on metal pump body having alined plunger bores therein, single-acting plungers arranged to Work 1n said bores and move 1n unison with each other, means for actuating said plungers, extensions of said plunger bores forming pulsation chambers between and alined with the plunger bores, suction valve bores intersecting said pulsation chambers, a suction chamber common to both pumps, a discharge chamber common to both pumps, discharge valve boresL intersecting said discharge chamber and said pulsation chambers, suction and discharge valves in said bores, surge chambers on the dead sides of the plungers, and a connection between said surge chambers.

In testimony whereof, I have hereunto set i my hand.

HENRY M. CHASE.

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