US1909410A - Pump - Google Patents

Description

May 16, 1933.

M. M. KLOSSON PUMP PUMP Filed June 17, 1950 3 Sheets-Sheet 2 M y 16, 1933- v V M. KLOSSON 1,909,410-

PUMP

Filed June 17. 1.950 3 Sheets-Sheet 5 Patented May 16, 1933 UNITED STATES PATENT: OFFICE manner. 1:. xnossomon xnmmonnnEw Yonx, 'ASSIGNOR r nurra'm smut PUMP COMPANY, or BUFFALO, NEW YORK PUMP Application filed June 17,

dling hot liquids such as hot oil. Pumps of.

this type are very useful in the handling of oils in petroleum cracking processes, where the oil must be handled while at very high temperatures. Great care must be taken that none of this oil escapes from the pump, because while at such temperatures it is ikely to break into flame immediately upon contact with air. If such hot oil works along the bearings, it is very apt to injure them and destroy the lubrication thereof, and also to ruin the packing means which must be provided for the bearings. An object of this invention is to provide an improved pump for the handling of hot liquids, such as hot oils, at various temperatures and pressures, and withtwhich injury to the bearings and packing glands will be avoided.

Another object of the invention is to provide an improved pump for hot liquids such as oils, at high temperatures; with which danger of leakage of oil will be avoided; which will operate for long periods of time with little or no attention, and with a maximum of safety and elficiency; and which will not bind or set during use.

Another object of the invention is to provide an improved pump for hot liquids which will accomplish each or any of the above objects, and which will be simple and inexpensive, and have maximum durability and eficiency.

Another object of the invention is to provide an improved method of handling hot oils and the like with maximum safety and minimum danger of leakage. Various other objects and advantages will be apparent from the following description of two embodiments of the invention, and

the novel features will be particularly pointed out hereinafter in connection with the appended claims.

In the accompanying drawin s: Fig. 1 is a front elevation, part y in section, of a double-suction, hot-oil ump constructed in accordance with this mvention;

Fig. 2 is a similar elevation, also partly in section, of a double-suction, hot-oil pump,

1930. Serial No. 461,784.

also constructed in accordance with the invention, but illustrating another embodiment thereof; I

Fig. 3 is a transverse, sectional elevation of a part of the pump shown in F i ..1, the 5 section bein taken approximately ong the line 33 of %ig. 1, to illustrate the mounting of the pump casing; and

Fig. 4 is an elevation on a somewhat larger scale of certain details of the pump shown in Fig. 2.

In the embodiment of the invention illustrated in Figs. 1 and 3, the improved pump is provided with spaced apart bearings 1 and j 2 for the pump shaft 3, the bearingsbeing 6 disposed onopposit sides of the pump cas ing or housing 4. lhe pump illustrated is of the horizontally split case, single-stage, double-suction, volute type.

The housing or casing 4 is provided with 7 a working compartment 5 which is closed at each end by a removable stuffing box 'housing 6, having a bearing passage extending into the working compartment, and rotatably mounting the shaft 3. A pump element 7, such as the impeller, is keyed upon the shaft 3 in the working compartment and rotates with the shaft.

A liner sleeve 8 preferably is, removabl secured in each bearing passage in each st -ing box housing, to take up the wear, and the portion of the shaft 3 extending through thestufling box housing is also preferably provided with a tube or wear sleeve 9 which is secured to and rotates with the shaft.

Such a tube or wear sleeve 9 may be made of hardened steel or other metal, and is tightly fitted to the shaft, as by being shrunk thereon or being given a drive fit thereover.

The tube or Wear sleeve 9 extends into the 9 working compartment 5 somewhat farther than the liner sleeve 8 and telescopes into an annular groove provided in the outer end of a collar or ring 10 which is keyed, by the key of the impeller, on the shaft 3 so as to 9 rotate therewith, and fills the space between the inner end of the tube 9 and the impeller 7, thereby protecting the shaft and keyway from the action of the hot oil.

Each collar or .ring 10 and the inner en loo of-the adjacent liner sleeve 8 are provided with cooperating shoulders and surfaces having a running fit between them and providing labyrinth passages 11 between them from the working compartment to the hearing surfaces between the liner sleeves 8 and the tubes 9. The outer end of each stufling box housing 6 is provided with a recess or cavity 12 opening outwardly in an endwise direction and normally closed by a removable ring 13.

The ring 13 has an aperture somewhat larger than the external diameter of the tube 9 which it surrounds and is provided with a flange 14 which extends into the recess 12 along the tube 9 and terminates in an internal flange 15 which may have a bearing upon the related tube 9. Packing rings or gaskets 16 may be disposed in the aperture of the ring 13 outwardly from the flange 15. A gland element 17 surrounding the shaft 3 is movable endwise into the aperture of each ring 13, and compresses the gaskets 16 against the flange 15 so as to deform them into close contact with the periphery of the tube 9 where it passes through the ring 13. Each gland element 17 may be adjusted endwise by means of swinging draw bolts 18 (Fig. 1). The tubes 9 may be confined against endwise movement away from the impeller and the labyrinth rings 10 by nuts 19 threaded upon reduced sections 20 of the shaft 3 that are within the gland elements 17. I Sealing rings 21 are disposed on each tube 9 between the outer end of the=adjacent liner sleeve 8 and the inner face of the flange 15', and a helical spring 22 is under compression between the sealing rings in each housing 6 so as to urge the sealing rings against the flanges 15 and the outer ends of the sleeves 8 and seal the abutting surfaces between the tube 9 with the flanges 15 and the sleeves 8. The stulfing box housing 6 is provided with an internal chamber 23 which is completely closed and sealed from the working compartment 5 of the pump casing and the bearing passage in which the liner sleeve 8 is disposed, this chamber being formed in any desired manner such as by coring the same when it is cast or by machining it out.

- A supply pipe 24 is connected by passage 25 to the lower part of each chamber 23, to supply a cooling liquid such as water to the chamber. An outlet pipe 26 is connected by passage 27 to the upper part of each chamber.

23,,by which the cooling liquid may be re moved from the chamber 23.

"A cooling liquid flowing through the chamber 23 cools the stuifing box housing-and the bearingv liner sleeve 8, so that if any of the'hot oil should work through the laby-- rin h passage 11 into and along the bearing su faces between the sleeve 8 and tube 9, it will be cooled before it has progressed far along the bearing surfaces or reached the sealing rings 21-and packing rings 16. In

this manner the hot oil, which might destroy the lubrication andthe bearing surfaces of the sleeves 8, will be cooled so as to have no destructive action on the bearing surfaces or, the packing andsealing rings. Cooling of the bearing also aids in preventing distortion of the pump parts under the heat of the hot oil being handled.

Pipes 26 lead to the u per 'and lower sections of each cavity 12 y means of which acool oil may be circulated through the cavities, or any liquid working along the bearing surfaces may be removed before it reaches the gland rings 16.

The pump element or impeller 7 carries wear rings 7 which have running fits with suitable parts of the pump casing and divide the working compartment. 5 into an inlet chamber 28 and an outlet chamber 29 which leads to an outlet coupling 30. The hot oil enters the pump casing through the chamber 28, then enters the impeller near the shaft 3, and is discharged by centrifugal action into the chamber 29, as usual in umps of this type, and it will be noted t at the shaft and its keyway are completely protected against contact with the hot oil. The labyrinth passages 11 form an effective seal in the suction passage, and not only reduce leakage to a minimum, but the film of liquid in the passage is cooled by the stuffing box housing, so that any hot oil working along the hearing will be cooled to such an extent that it will not flash into steam or flame when it comes in contact with the air.

Considering now Fig. 2, the pump illustrated is somewhat similar to that shown in Fig. 1, but instead of having the bearings 1 and 2 arranged on opposite sides of the pump, the bearings 33 and 34 are both arranged on the inboard side or end of the pump, and the opposite ends of the pump are closed by the stuffing box housings 6a that rotatably support the shaft 3a. The pump casing 4 is the same as in Fig. 1, but the stufling box housings 60, do not have the sealing rings 21. The shaft 3a is provided with wear tubes 9 and the bearing housings are provided with liner sleeves 8a, both as in Fig. 1.

Each wear tube 9 is held against endwise displacement away from the impeller by the nuts 19 as in Fig.1, and a gland element 17- is employed only at the inboard end of the pump and is adjusted endwise in a manner similar to the adjustment of the gland element 17 in Fig. 1. The liner sleeve 8a at the inboard end of the pump is provided at its outer end with an external, peripheral flange which is received within an enlarged outer end section of the bearing passage or bore aperture 32 in alignment with the tube 31,

so that oil supplied to the tube 31 may reach the cooled section of the bearing between the tube 9 and the sleeve 8a at the inboard end of the pump. The outer end of the nipple 31 is flush or recessed into the peripheral wall of the stufling box housing, so that the stufling box housing at the inboard end of the pump may be inserted or removed whenever desired.

A pipe 37 passes through a passage in the pump casing 4 in alignment with the bore of the nipple 31, and is threaded into, the nipple 31. A packing gland 38 surrounds the pipe 37 where it enters the pump casing. The stufiing box housing Sat, at each end of the pump in Fig. 2, may be provided with a removable end plate 6?) which is at the outer end of the housing when the housing is'assembled in a pump casing. By reason of this removable plate 612, a chamber 23a,

through which the cooling medium may be circulated, is accessible directly, so that it may be cast directly by the mold'w'alls or machined out, instead of being formed by a core which is'destroyed at each casting operation, as would usually be done in casting the housing shown in Fig. 1. Pipes 39 and 40 are threaded into apertures in the plate 67) at the inboard end of the pump by which the fluid cooling medium may be circulated into and through the cooling chamber 23a.

At the outboard end of the pump, a pipe 41 leads to a chamber 42 on the inner end of the removable end plate 6?), for supplying a lubricant to the bearing surfaces between the tube 9 and the sleeve 8a at that end of the pump. Pipes 43 and 44 open, through the same plate 61), into the cooling chamber 23a of that plate for supplying a cooling medium to the bearing at the outboard end of the pump. The pump is otherwise substantially the same as described in connection with Fig. 1.

In view of the fact that the liquid being handled by the pump is very hot, it will be obvious that the pump housingor casing will expand considerably when the pump is started up after having been idle, and will again contract when the pump is shut down. This expansion and contraction of the pump casing is permitted, in accordance with this invention, by mounting the bearings 1 and 2 of Fig. 1, and 33 and 34 of Fig. 2 upon the base A, and the pump casing itself is supported in spaced relation to this base A by means of posts 45,'Figs. 1, and 3, which extend upwardly from the base and support the pump housing on diametrically opposite sides of the pump shaft, as shown clearly in Fig. 3.

The posts 45 support the pump casing at the cooled sections of the bearings, which have a minimum of contraction .and expansion, and the remainder of the pump casing between thecooled bearings may expand and contract freely without material hindrance. In Fig. 2 the cooler bearing sections of the pump casing are supported similarly upon posts 45a that extend upwardly from the main base A, in the same mannerasjn Figs. 1 and 3. Were such expansion and contraction not permittedin this manner, the expansion of the fpump casing would cause it to spring the sha t or binding of the shaft, which would make the pump inoperative. With this arrangement, however, the pump will operate freely under all conditions and at all times.

The labyrinth passages provided by the rings 10 and the liner sleeves 8 reduce to a minimum the possibility of hot oil escaping along the bearings. Any hot oil which does work along the bearings in the pump casing will be cooled before it can reach the air, and therefore will not ignite or steam upon exlaterally and cause grabbing a posure to air, and the hot oil is also prevented from reaching and injuring the packing elements in the stuffing box house. The operation of this improved pump would appear to be clear from the foregoing description.

It will be obvious that various changes in the details, which have been herein described and illustrated in order to explain the nature of the invention, may be made by those skilled in the art within the principle and scope of the invention as expressed in the said casing and cooperating with said sleeves toform a labyrinth flow-resisting passage to the bearing surface between said sleeves, a pump element carried by said shaft in said casing, and means for circulating a cooling medium through said cooling chamber.

2. A pump for hot liquids, comprising a casing having a bearing passage in one end with a closed cooling chamber in heat conducting relation to and separate from said passage, a liner sleeve removably secured in said passage, a shaft extending through said passage into said casing, a cylindrical sleeve surrounding and secured to said shaft and extending through said passage and liner sleeve, a ring carried by said shaft withinsecured in each passage, a shaft extendingthrough said sleeve and across said compartment from the exterior of said casing, a pump element keyed to said shaft within said compartment, said shaft having a collar on each side of said element and rotating therewith, a tube of wearing-metal tightly secured on said shaft on each side of said element and abutting said collar, said tubes extending along and rotatably mounted in said liner sleeves, said collars cooperating with said .tubes and said sleeves to provide small labyrinth passages from said compartment to the contact faces between said tubes and sleeves, and means completely closed from said bearing passage and said working compartment for cooling said liner sleeves for a section of the length of each in an endwise direction.

4. A pump for hot highly inflammable liquids, comprising a casing having a working compartment and a bearing passage in opposite ends leading to said compartment, a liner sleeve removably secured in each passage, a shaft extending through said sleeve and across said compartment from the exterior of said casing, a pump element keyed to said shaft within said compartment, said shaft having a collar on each side of said element and rotating therewith, a tube of wearing-metal tightly secured on said shaft on each side of said element and abutting said collar, said tubes extending along and rotatably mounted in said liner sleeves, said collars cooperating with the ends of said element and with said tubes and said sleeves to provide small labyrinth flow-resisting passages from said compartment to the contact faces betwen said tubes and sleeves and between said element and the shaft, means completely closed from said bearing passage and said working compartment for cooling said liner sleeves for a section of the length of each in an endwise direction, and a packing gland at the outer end of the said bearing passage through which said shaft enters the casing and sealing the joint between the outer end of the adjacent liner sleeve and oooperating tube, whereby any hot liquid leaking between said tube and said sleeve toward said packing gland will be cooled before reaching said gland.

5. A pump for hot liquids, comprising a casing having a working compartment and a bearing passage in opposite ends leading to said compartment, a liner sleeve removably secured in each passage, a shaft extending through said sleeve and across said compartment from the exterior of said casing, a

pump element keyed to said shaft within said compartment, said shaft having a collar on each side of said element and rotating therewith, a tube of wearing metal tightly secured on said shaft on each side of said element and abutting said collar, said tubes extending along and rotatably mounted in said liner sleeves, said collars cooperating with said tubes and said sleeves to provide small labyrinth passages from said compartment to the contact faces between said tubes and sleeves, means completely closed from said bearing passage and said working compartment for cooling said liner sleeves for a section of the length of each in an endwise direction, and means separate from said cooling means for lubricating the hearing be tween the tubes and sleeves in the cooled sections thereof.

6. A pump for hot liquids, comprising a casing having a working compartment and a bearing passage in an end leading to said compartment, a working element rotatably mounted in said passage andextending into said compartment, said end of the casing having a closed chamber in heat conducting relation to the inner end section of said passage, and a second chamber partway between the ends of said passage, across which second chamber said element extends, a packing gland at the outer end of said passage through which said element extends, a pair of sealing rings in said second chamber closely fitting said rotating element and abutting the opposite ends of said second chamber, a spring in said second chamber and urging said sealing rings against said end walls, and connections to said first chamber b which a cooling fluid may be passed theretlirough to cool said casing along the inner end section of said passage, and thereby cool any of the liquid being pumped, which may work along said passage and rotating element, before it reaches said sealing rings and gland.

7. A pump for hot liquids, comprising a casing having a working compartment and a bearing passage in an end leading to said compartment, a working element rotatably 'mounted in said passage and extending into said compartment, said end of the casing having a closed chamber in heat conducting relation to the inner end section of said passage, and a second chamber partway between the ends of said passage, across which second chamber said element extends, a packing gland at the outer end of said passage said sealing rings against said end walls,

connections to said first chamber b which a cooling fluid maybe passed theret rough to cool said casing along the inner end section of said passage, and thereby cool any of the liquid being pumped, which may work along said passage and rotating element, before it reaches sald sealing rings and gland, and connections to said second chamber by which a cooling liquid may be circulated through said second chamber.

8. A pump for hot liquids, comprising a casing having a working compartment and an end section for said compartment, said section having a bearing passage extending into said compartment, a working element rotatably mounted in said Passage and extending into said compartment, said end sectionhaving a closed chamber therein ad jacent its inner end and a cavity opening endwise from the outer face and surrounding said passage, a removable closure for the outer end of said cavity and having an aperture through which said element extends, a packing gland in said aperture for sealing said aperture closely around said element, the inner face of. the closure being spaced from the inner end of the cavity, and a connection by which a fluid may be supplied to said second chamber.

9. A pump for hot liquids, comprising a casing having a working compartment and rotatably mounted in said passa an end section for said compartment, said section having a bearing passage extending into said. compartment, 9. working element and extending into said compartment, said end section having a closed chamber therein adjacent its inner end and a cavity opening end- -wise "from the outer face and surrounding said passage, a removable closure for the outer and of said cavity and having an aperture throu h which said element extends, a packing g and in said aperture for sealing said aperture closel around said element, and sealing means osed in said second chamber and sealing t 0 joint between the said rotating element and the ends of said second chamber.

10. A pump for hot liquids, comprising a casing having a working compartment and an end section for said compartment, said section having "a bearing passa e extending into said compartment, a wor ing element chamber, and means by which a fluid may be supplied to said second chamber.

11. A pump for hot liquids, comprising a casing having a working compartment and a bearing passage at one end leading to said compartment, a working element rotatably mounted in said passage and extending into said compartment, said casin having a chamber in close proximity to but separate from the inner end of said passage, and in heat exchanging relation thereto along said passage for a considerable distance at the inner end section thereof, a packing gland in the outer end section of said assage and spaced endwise away from said chamber, means by which a cooling medium may be circulated through said chamber to cool any liquid workin along said passage toward said gland an means for removing the liquid working along said ,passage at a point between said chamber and said gland.

12. A pump for hot liquids or the like, comprising a casing having a working compartment and a bearing passage extending into the compartment, a liner sleeve secured in said passage, a shaft extending through sleeve, said sleeve and tube terminating at different points within said compartment, and

means carried by and rotating with said shaft within said compartment and overlapping with the inner ends of both said sleeve and tube with. a closely running fit, so as to provide a flow-resistlng, labyrinth passage leading from said working compartment to the bearing surface between said tube and sleeve.

' MICHAEL M. KLOSSON.

rotatably mounted insaid passage and ex- I tending into said compartment, said end section having a closed chamber therein adjacent its inner end and a cavity opening end wisefromthe outer face and surrounding said passage, a removable closure for the out-

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