US1745800A

US1745800A - Liquid-pump arrangement

Info

Publication number: US1745800A
Application number: US98706A
Authority: US
Inventors: Gustav A Kramer
Original assignee: Shell Development Co
Current assignee: Shell Development Co
Priority date: 1926-03-31
Filing date: 1926-03-31
Publication date: 1930-02-04
Anticipated expiration: 1947-02-04

Description

Feb. 4, 1930. G. A. KRA'MER 1,745,800.

LIQUID PUMP ARRANGEMENT Filed March 51, 1926 3 Sheets-Sheet 1 I G. A. KRAMER Z Z w? 7 M r,

l illlflllllllllllI!!! I rill/Ill! vllIIIl/ll! I'll rIIIIIIA lflida Filed March 31, 1926 LIQUID PUMP ARRANGEMENT VII/1 I III Feb. 4, 1930.

Feb. 4, 1930. a. A. KRAMER LIQUID PUMP ARRANGEMENT Filed March 31. 1926 3 Sheets-Sheet 3 '15 the apparatus be prevented as the air readily Patented Feb. 4, 1930 UNITED". STATES PATENT oFFlca GUSTAV A. KRAMER, 01' CONCORD, CALIFORNIA, ASSIGNOB, BY MESNE ASSIGNMENTS,

TO SHELL DEVELOPMENT COMPANY, OF SAN FRANCESCO, CALHOBNIA, A. CORPO- RATION OI DELAWARE LIQUID-PUMP ARRANGEMENT Application filed March 81., 1926. Serial No. 98,708.

- My invention relates .to vacuum distillation of petroleum oil, and more particularly to a novel liquid pump arrangement. I

-In the oil refining industry it is common practice to vapori'ze the higher boiling point fractions from crude oil under a high vacuum so that it will notbe necessary to heat the crude oil sufficiently to cause an undesirable decompositiomor cracking of the molecules of the oil. The vapors thus produced are subsequently condensed under a high vacuum. It is very essential that the vacuum employed be very high, preferably at an absolute pressure of 25' millimeters of mercury or below.

It is also quite'essential that air leaks into combines with or oxidizes the oil with a consequent production of deleterious oxidation products. It is a problem to maintain conditions ofhighevacuumand exclusion of air in stills, condensers, and associated apparatus employed for this purpose.

- It is an object of my invention to provide a novel liquid pump arrangement which re-.

moves liquid from a system operated under a vacuum but will.absolutely not leak air into the system.

In practice either reciprocating or rotary liquid pumps may be used. All such liquid pumps require stufling boxes and, since it is very diflicult to maintain stuiling boxes gastight, there will at times be a leakage of. air into the" pump which reduces the 'vacuum It is-a-nother object of this invention to provide a liquidpump arrangement having a liquid pump which is submerged in a liquid so that the pump is entirely sealed and can therefore not leak air into the system on which the arrangement is used, this liquid being of such a nature that a small leakage thereof intothe pump will not be objectionable.

It is a. further object of this invention to provide a liquid pump arrangement of the character mentioned 1n which said .li uid pump discharges the liquid it handles Into the body .of liquid in which it is submerged,

so that said body of liquid will be of the same character asthe liquid being pumped.

-. It is a. stillfurther object of this invention to provide a liquid'pump arrangement having a special design of gear pump.

It is a still further object of this invention to provide a liquid pump arrangement of the character specified which requires no stufling boxes.

Other objects and advantages of this invention will be made'evidnt hereinafter.

Referring to the three drawings in which I illustrate tion, I a

Fig. 1 is. a partiallysectioned view showing an application of my invention.

Fig.2 is an enlarged sectional view taken through my invention and on the line 2-2 of 'Fig. 1.

Fig. 3 is a plan view of myinvention taken as indicated by lines 33 of Figs. 1 and 2.

prises a base 11 having a plate 12 to the lowerface of which a flange 13 formed at the uppfir e end of'a tank 15 issecured by bolts 17.

tank 15 as shown in Fig.2 extends downward 'ly from the base 11, having a cylindrical wall 19 and abumped bottom 20. An outlet 21 is connected to a cylindrical wall 19 o tank-15 a considerable distance above the botv 23 having a valve 24 tom 20, anda drain pi v is connected with the interior of the tank 15 through the bumped bottom 20.' A oke 26 is supported in the tank 15 by thease 11.

This yoke 26 has an upper cylindrical flange- 27 which issecured against a lower face of the plate 12 by means of a plurality of stud bolts 28. Extending. downward from the flange 27 is a cylindrical wall 290i the yolgp' 26, thiswall 29 being provided with openings 30. A gear pump 34 is secured to the lower end a preferred form of my inven-- of the yoke 26 near the bottom of the tank 15.

The gear pump 34 is provided with a housin 35 having an annular flange 36 through whic screws 37 extending into a lower part of the yoke 26. Extending downward from an upper wall 39 of the housing 36 is a side wall- 40 having a flange 41 formed at the lower end thereof, to which a cover 42 of the gear pump 34 is secured by means of cap screws 43 which extend through the cover 42 and into the flange 41 of the housing 35. The housing 35 of the gear pump 34 is provided with

internal gear chambers

44 and 45 which have cylindrical faces 46. Placed in the gear chamber 45 is a drive gear 47 which is rigidly secured on a pump shaft 48 by a key 49. The pump shaft 48 is journaled at its lower end in a socket'5O formed in the cover 42 and extends upward from the. pump 34 through a bearing 52 formed in the upper wall 39 of the housing 35. The pump shaft 48 is journaled concentric with the cylindrical face 46 of the chamber 45 and the drive gear 47 is of such a size that the outer faces of the teeth thereof pass extremely close to the face 46 when the gear 47 is rotated. Placed in the chamber 44 is a driven gear 54 which is carried by a shaft 55 supported at its lower end by a. socket 56 formed in the cover 42 and at its upper end by a socket 57 formed in the upper wall 39 of the housing 35. The driven gear 54 is of such a size'that the outer faces of the teeth'thereof pass very close to the cylindrical face-46 ofv this chamber 44. As shown in Fig. 5 the teeth of the drive and dtiven

gears

47 and 54 mesh at their adjacent sides.

An extension 58 is formed on one side of the housing 35, this extension having an inlet passage 59 which is provided with a threaded and vertically disposed mouth 60, into which the lower end of an inlet pipe or conduit 61 is threaded. An exhaust passage 64 is formed in the housing 35 directly opposite from the inlet passage 59, and has a mouth 65 which opens directly into the tank 15.

As shown in Figs. 2, 3 and 4 the upper end of the pump shaft 48 extends into a socket 68 formed in the lower end of a gear shaft 69. A key 70 is provided at this point for drivably connecting the pump shaft 48 and the gear shaft 69 together. The gear shaft 69 extends upward through a bearing 73 of the base 11.

. the bearing The'bearing 73 is made rigid by webs 74 and is preferably provided with a bearing'bush-- ing 75. A bevel gear 77 is secured to the upper end of the shaft 69 which projects through 73 by means of a key 78. The bevel gear 7 is engaged and driven by a pinion gear 80 which is secured on a pinion shaft 81. The left end of the pinion shaft81 is journaled in a pillow-block 82 secured to a shelf 83 of the base 11 by suitable bolts 84. The

.right end of the pinion shaft 81 is extended into a connector 85 by means of which it is connected to a motor shaft 86 of a. motor 87.

As'shown in Figs. 2 anti 3 the motor 87 is sewhich is situated adjacent to the pump-34 and below the outlet pipe 21 of the tank 15. A valve stem 96 extends from the throttle valve proper, upward through the plate 12 of the base 11 and has an operating lever 97 secured to the upper extending end thereof. .The valve may thus be readily operated from the exterior of the tank 15.

The conduit 61, as shown in Fig. Land merely for the purpose of illustration, is extended to a condenser 100 which is a part of a system of apparatus which is adapted to be operated under a vacuum. Thiscondenser 100 has 'a'cylindrical shell 101 to the opposite ends of which heads 102 are secured. Intermediate partitions or heads 104 are secured inside the shell 101 in a manner to divide the shell into an upper chamber 105,'an inter-' mediate-cooling space 106 and a lower chamher 107. Extending between the intermediate heads 104 and through the. cooling space 106'is a plurality of pipes 108, the passages of which'pipes communiate with the upper andlower chambers 105 and 107. A cooling fluid is suppliedto and drawn from the cooling space 106 by means of pipes 109.

Vapor to be-condensed is supplied to the 1 upper chamber 105 by means of a pipe 111 having a valve 112. The vapor passes downward through the pipes 108 and is condensed,

the condensates falling intothe lower chamher 107. The uncondensed vapors are drawn from the lower chamber 107 through a pipe 115 by means of a vacuum pump 116 which places avacuum on the system. The condensates pass through the conduit 61, the throttle valve 95 having been previously opened by an operation of the lever 97, and into the intake passage 59 of the pump 34. The motor 87 at this time is in operation and rotates the pinion shaft 81, which in turn rotates the bevel pinion which engages the bevel gear 77.

The'bevel gear turns the gear shaft 69 which drives the pump shaft 48. The drive gear 47 is rotated by the pumpshaft 48 and by reason of its engagement with the driven gear 54 rotates the driven gear therewith.

The

gears

47 and 54 rotate in directions in= dicated by arrows 120 of Fig. 5. The condensates are carried between the spaces in the teeth of these gears from the intake passage 59 and are delivered to the exhaust passage 64. Since the teeth of the gears mesh at their adjacent sides no liquid can flow therebetween back into the intake passage 59. The principle of operation of the gear pump 34 is iden- 'tical with that of standard forms of gear pumps. The liquid flows from the exhaust passage 64 into the interior of th tank 15. This liquid fills the tank to a level indicated 1o unnecessaryto provide 'stufiing boxes. Any

1,7u,eoo

at121 in Fig. 2, which level is determined .by the outlet 21. 1 From the drawings it is obvious that the gear pum 34, which constitutes the liquid pump of t e invention, and the throttle valve 95 are entirely submerged in the body of liquid in the tank15. This liquid provides an absolute seal for the difierent parts of the pump and for the throttle valve so that it-is slight leakage in the pump is readily compensated for by the: operation of the gear pump and any slight leakage will not admit air into the pump, but will admit liquid which is of the same character as that liquid being pumped. By discharging the condensates di- 7 rectly into the tank. 15, the body of liquid in which the pump is submerged is constantly changing and is always the same as the liquid 20 being pumped. By such provision there will be no contamination of the submerging liquid such as would be the case if a separate sealingliquid, independent of the liquid being pumped, were provided.

The, essential feature of my invention is the provision of a liquid pump which is submerged in a bodyof liquid so that the liquid pump' will be sealed by his liquid and so that no air can enter the l'quid pump or the system on which the liqu d pump is used. The discharging of condensates directly into the tank is also a featurejof my invention. A

ear pump of the character shown in the rawings readily lends itself to my invention since it is simple in construction, continuous in operation and will require but little attention, and readily compensate for any slight leakage of oil from the tank 15 into the pump 34 which might occur.

The vacuum pump 116 maintains a vacuum in the system and the liquid pump assists in asmuch as it prevents a reverse flow through the pipe 61. The liquid pump will remove only 1 iquid from the chamber 107, and when all the liquid is drawn therefrom it merely functions to keep theair out.

I claim as my invention: 1. In a device of the character described:

. a tank; a pump supported within said tank; a drive means supported above said pump; connecting means drivably connecting said drive means with said pump, said connecting means egtending downward from said drive means to said pump; a conduit connecting to the inlet of said pump, "said'pump discharging into said tank; and an outletfor said tank arranged to maintain a body of liquid in said tank sufiicient to sub merge said pump.

2. In a vacuum condensing apparatus the combination of: a container into which liquid is-delivered; means for maintaining a vacuum in said containerabove said liquid; apipe so connected to .said container that said liquid can be withdrawn therethrough;

' 5. In a device of I. a pump c into which said. pipe d:i5- charges; impe g means within said casing; and a tank surrounding said easing into which liquid from the interior of said casing is dis'harged,-said tank being so constructed that the liquid so discharged submerges all openings in said casing.

- 3. In a' vacuum condensing apparatus, the combination of: a container into which liquid is delivered; means for maintainin a vacuum in said container above said liqui a pipe so connected to said container thatsaid liquid can be withdrawn therethrough: a pump casing into which said pipe dischar es; impelling means within said casing; an a tank surrounding said casing into which the discharge from said pump is allowed to flow, said tank being so constructed that the liquid so discharged submerges all openings'm said cas- 1n t. In a vacuum condensing apparatus the combination of: a container into which liquid is delivered; means for maintaining a vacuum in said container above said liquid; a pipe so connected to said container that said liquid can be withdrawn therethrough; a pump castank being so constructed that the liquid. so

discharged provides a liquid seal for all openings in said casing.

'. means drivably connecting said .drive means with said pump; a conduit connectin to the inlet of said pump said pump disc arging into said'tank; an means for maintaining a body of liquid in said tank'suficient to submerge said pump.

7. In a device of the character described: a tank; a pump suspended within said tank; a drive means supported upon said tank above said pump; means drivably connecting said drive means with said pump; a fluid inlet through said tank to said pump; a conduit provided on said pump connectm with said fluid inlet; and an outlet for said tank arranged to constantly maintain a body of liquid therein sufiicient to submerge said pump. o

8. In combination with a vacuum 'condens ing apparatus having a liquid delivery chamthe character described: I I a tank; a pump suspended within said tank;

I her and a discharge pipe leading therefrom;

a pump housing; a tank in which said housing is suspended; impelling' means within said housing for discharging liquid from said chamber into said tank; and an outlet for said tank arranged to maintain a body of liquid in said tank suflicient to entirely. submerge I said housing.

' sufiicient to entirely submerge said pump housing.

In testimony WhereoflI have hereunto set my hand at Martinez, California, this 20th day of March, 1926.

' GUSTAV A. KRAMER having