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Publication numberUS2682229 A
Publication typeGrant
Publication dateJun 29, 1954
Filing dateDec 26, 1950
Priority dateDec 26, 1950
Publication numberUS 2682229 A, US 2682229A, US-A-2682229, US2682229 A, US2682229A
InventorsFrederick O Luenberger
Original AssigneeUs Electrical Motors Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pressure system for submersible structures
US 2682229 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Patented June 29, 1954 PRESSURESYSTEM FOB 'SUBMERS IBLE STRUCTURES--= I Frederiok-0,Luenbe1:ger, LosAngeles; CaliiZ, as-

signer to U; S.. Electrical Motors,- Inc, Los'Angelsflf CalifJ," "a" corp'oration-v of California Ap lication Decembelfi26, 1950 S'erial Noi-202, 719

6 Claims. (01. 103 -87) This? invention, relates $130 submersible :structures, such as a motor-pump unit adapted tooperate in a Well.

- In suchssubmersible'structures iitisaof fundamental importance to-prevent-tentryot well fluidintoith'e motor casing; The. well fiuid in which:

theiii-nitzais designed to operateordinarilyoar-- ri'estsuspended particles of grit;v as: well: as other, foreignY-cmatten that is: likely: to harm-the. statorwinziings'andthearotatingaparts: of 1 the -motor.:

Butefonthe rotatingshaift that necessar-ily extends bey'ondrrthe motor casing: for 1 cooperation Witt-r1thenpumpnitgis v a simple matter .to provide sh aiuzanmthexmotor casing, It. hasbeenfound that sea-ls-;mays:be efiective'ly' used,.provided= that there? existsliwithin'the" motor casing. aifiuid liamngea pressureiexceedingithatzofthe W elLfluicl om the';'. outside: ofrthe seal. The internal motor: fluid that is often-used-isinert -oi-1,. or the like. The fnnct-iontof this:increasedrpressuretiscto insurezrthat the" leakage thatmmay 7exist; however smail iis; outwardly zof the-n casing :throug-hathe runnin-gtseal; .sthereby-qmainta-ining the-purity of thetmotor fluirtrwithin thecasingL-a i. Itzistan. object-of this: inventionsto: providean improved system-1for wmain-tainingaa substantial excess'spressure of the internal motor fluidfwhereiby effective". ioperation zofthewseal is achieved :to. exoludeitherwellifluidt; V

It: is: anotheri. object; of thisrinventioneto:=pro video): compact submersibleunit. in'- which areser a-v voin oi: m'otoiifiluid;;ist=provid;ed:nss a =-part:-:of-v the submersibleltstructurei itself, together: with-:novel haeangafbrsrelevatixig: thezpressureasofsi the motor fluid within th'eireservoir: 1:1. o

Tlietexcessipressure ln'ecessamyiior. eifec'tiv'erzopi ei a-tion of the sealisdependent upomthe :rota -J some speed of the appartus; Iti is accordingly; another object -ofi' this invention to provide systerrr tliatewi'll supplyan excess pressure in an amount idependent upon the rotational speed ofi the apparatus.

7 It still-another object- 01i this ihye'ntl-on to uti1ize;="=---tl 'ie 'veloeityorpressure: head deve l'oped i pump a submersib1e=-' motor-pump un itto-supply'a'ii excess pre'ssure' to theimotor casing fluidi'r ranamount dependent upon tlie rotational speed 'of the apparatusi I;

lt' is still aimtlier object of this "inventionilo utili'ze-thewaper cliaraeteristfcs ofavolatilema emerges-causean-emesspressure in th'efintbr nal'motor casing fluid in order to secure an-efliectivewopera'tion-of the sealing means to prevent ingress of Well fluid into the motor casing.

This? invention-possesses many other advan I tages, andi'has other objects-Which'maybe made more clearly apparent froma consideration ofseveral: embodiments of the invention; For this purpose there are shown aiew vforms'in the draw ings accompanying and forming-part of the pres-' These forms will now be described-in detail, illustrating-the: general" principles ofth'e invention; but itis to be understood that: thisxdetailed' description is not to be taker-1+ in a limiting sense, since the scope ofthe inven tion is: bestdefined'bythe appended claims;

Referring-to the drawings:

Figure 1 is a diagrammatio'view, mostly in section, illustrating a motor-pump unit in opere ativeposition in awellgand embodying one form of this invention;

Fig. 2 is'aview similar to Fig. 1, but illustrating a modified form of this'invention; and

Fig. 3 is an enlarged fragmentary sectional View illustrating, byway of example,-aseal that may! beused in thezstructure'. i

In the drawingsflhereis illustrated a submersi ole-unit in a Well casing it, the unit being dis-- posed below the level! I of the well fluid IZ there in. The unit comprises a pump I3, Whi'ch may be'of the centrifugal type; and a motor 14. -'I-he"- motor i4 is coupled to the pump 13' structurally by a :irame l5, and rotatively by the couplingfkl 6 that isconneeted to the pump shaft I? and" the motorlshaft Iii-respectively;

The motor stator-windings H! are enclosewby a casi'ng 26; together with upper and lowerend brackets 21: and 22 that are secured in'fluid tight, relation-to the casing zil'. These'bracketst'l and- 22 house suitable bearingstructures 23 and" 2.1 for'themotor shaft is irluid such as oilz'havin'g? insulating properties completely fill's -thei rnotor' casings i Asuthe shafti idextends through: tlie-umfa'ei' end-bracket- 2! it is'necessary there to p'rovi'd'e a sealing i, structure "to- 1 prevent entry" of? Well fluidl?.. A sealingstruoture that' 'may be used'isiillustrated inFig. 3.

Theoseal comprises in essence, a stationary:

member mountedx on the: casing 2a and; a rotary member mounted on the shaft iii. A sleeve i together with ring 2 t accommodates the rubbing stationary elementatl' thatil'is providedwith a frustowonicalsurface; The stationary seaung: elements 25 2 6; and-2lare in'sertable intoa tubular extension- 2 1 d-o'f the 1 upper end bracket "2i in fluid-tight relation therewith. The element 21 may be of special wear-resistant material. A rotating element 28 is carried by the shaft I8. This rotating element 23 has a surface mating with the frusto-conical surface of the stationary element 21, and in rubbing rotational contact therewith.

The eifectiveness of the seal in preventing entry of well fluid I2 into the motor casing 2|] alon the motor shaft I8, for a given rotational speed, is dependent upon a minimum excess pressure of the internal motor fluid as compared with the pressure of the well fluid I2 at the seal. By providing such an excess pressure, any leakage, however small, that may occur is of motor fluid outwardly of the casing 20. Accordingly, the purity of the internal motor fluid is maintained, insuring against contamination of the operating parts of the motor I4.

A reservoir for the internal motor fluid is conveniently provided as a part of the submersible structure. For this purpose, the lower end bracket 22 may be of inverted cup-shaped configuration, providing a motor fluid chamber 29 immediately beneath the bearing 24. A plate 30 extends across the end of the bracket 22. Depending from the plate 30 is a boss 3I having a through aperture 32 leading to chamber 29. A flexible metal bellows 33 has a mouth 33a circumscribing the boss 3| and is secured thereto. Accordingly, the interior of the flexible bellows 33 is in communication with the chamber 29 and the interior of the motor casing by way of the aperture 32.

Any pressure exerted on the exterior of the bellows 33 will necessarily be communicated to the internal motor fluid, the bellows 33 forming a part of the internal motor fluid reservoir. It is not suflicient, merely, that the exterior of the bellows 33 be subjected directly to the well fluid; substantially more pressur is necessary in order to achieve the desired operation of the seal while the unit is in operation.

To supply such pressure to the external portion of the bellows 33 and, thereby, to the motor fluid, there is illustrated in Fig. 1 a pressure chamber 34 formed by a supplementary rigid housing 35 carried by bracket 22, This housing 35 substantially circumscribes the bellows 33, but is out of fluid-conducting relation with the interor of the bellows 33.

The chamber 34 is filled with well fluid I2. A conduit 36 communicates the pressure developed within the pump I3 to the chamber 34. Accordingly, when the unit is operating, the pressure of the pump, or a portion thereof, is communicated to the fluid within the pressure chamber 34. The pressure of the fluid in chamber 34 is transmitted to the internal motor fluid through the flexible bellows 33 forming a part of the reservoir therefor.

The effectiveness of the seal is dependent upon the rotational speed of the device. By utilizing the pressure developed by the pump I3 to supply such excess pressure, the requirements for the effective operation of the seal are satisfied, since the pressure communicated by the conduit 36 is the pressure developed by the pump, in turn dependent upon the speed of rotation of the apparatus.

In Fig. 2 there is illustrated a modified form of this invention, which accomplishes the result of supplying an excess pressure to the internal motor fluid. In this instance, a pressure chamber 40 is provided by a supplementary rigid hous- 4 ing 4! attached to the bracket 22. The chamber 40 is in this instance sealed.

In the pressure chamber 40 there is provided a small quantity of volatile fluid 42. pressure due to the fluid 42 is communicated to the internal motor fluid through the flexible bellows 33, thereby maintainingsuchexcess of pressure as is necessary for successful operation of the seal.

Ordinarily, the conditions under which the submersible structure can, between limits, be anticipated. Accordingly, the fluid may be chosen which best fulfills the requisites of the system, giving due regard to the temperature, the depth at which the system operates, and the desired minimum pressure differential required for the particular type of seal. Fluids such as methyl chloride, butane, and propane may be used.

The amount of fluid 42 used, while small, is such that for all limits of operation, sufiicient fluid 42 is available to supply the necessary pressure. i r I The inventor claims:

1. In a submersible structure adapted to operate in a well or the like: a motor having a casing and a shaft extending beyond said casing; a pump operated by said motor and coupled to said shaft; rotary and non-rotary elements carried by the shaft and the casing respectively. said elements being in engagement with each other to form a seal between said motor casing and said shaft to exclude well fluid from said casing; means forming a reservoir in communication with the interior of said casing, including a flexible bellows; means forming a pressure chamber contiguous with said bellows, but out of fluid conducting relation with the interior thereof; a liquid completely filling the casing and the reservoir; and conduit means connecting said pressure chamber and the outlet side of said pump for elevating the pressure of said internal liquid to create a presure drop across said seal from the interior of the casing.

2. In a submersible structure adapted to operate in a Well or the like: a motor having a casing and a shaft extending beyond said casing; rotary and non-rotary elements carried by the shaft and the casing respectively, said elements being in engagement with each other to form a seal between said motor casing and said shaft to exclude well fluid from said casing; said casing being adapted to contain internal'fluid; means forming a reservoir for said internal fluid, and in communication with the interior of said casing, including a flexible bellows; means forming a sealed pressure chamber contiguous with said bellows, but out of fluid conducting relation with the interior thereof; and a volatile fluid in said pressure chamber for exerting a pressure on said bellows to elevate the presure of said internal fluid to create a pressure drop across said seal from the interior of the casing; the amount of volatile fluid being such with respect to the size of the pressure chamber as to provide both a vapor and a liquid phase in said pressure chamber.

3. In a submersible structure: a motor having a shaft; a substantially cylindrical casing sur-, rounding said motor; a first bracket for one end of said casing, said shaft extending through said bracket; means carried by said first bracket forming a seal between said shaft and the exterior of said first bracket; a second bracket for the other end of said casing, said second bracket being of cup shaped configuration facing longi- The vapor tudinally outwardly of said casing, said second bracket being adapted to carry a bearing structure for the end of the shaft, said second bracket forming a space beyond said shaft and aligned therewith, said space being in communication with the interior of said casing; a plate accommodated on the open portion of said second bracket, said plate having an apertured boss extending outwardly of said space and aligned with said shaft; a flexible bellows accommodated on said boss, the interior of said bellows being in communication with said space; said bellows, said casing, and said space being adapted to contain an inert fluid; a housing surrounding said bellows and secured to said second bracket, said housing forming a pressure chamber for said bellows; and means for supplying pressure to said pressure chamber for elevating the pressure of said fluid.

4. In a submersible structure: a motor havin a shaft; a substantially cylindrical casing surrounding said motor; a first bracket for one end of said casing, said shaft extending through said bracket; a pump operated by said motor and coupled to said shaft; means carried by said first bracket forming a seal between said shaft and the exterior of said first bracket; a second bracket for the other end of said casing, said second bracket being of cu shaped configuration facing longitudinally outwardly of said casing, said second bracket being adapted to carry a bearing structure for the endof the shaft, said second bracket forming a space beyond said shaft and aligned therewith, said space being in communication with the interior of said casing; a plate accommodated on the open portion of said second bracket, said plate having an apertured boss extending outwardly of said space and aligned with said shaft; a flexible bellows accommodated on said boss, the interior of said bellows being in communication with said space; said bellows, said casing, and said space being adapted to contain an inert fluid; a housing surrounding said bellows and secured to said second bracket, said housing forming a pressure chamber for said bellows; and conduit means connecting said pressure chamber and the outlet side of said pump for elevating the pressure of said fluid.

5. In a submersible structure adapted to opterior of said casing, including a flexible bellows; means forming a sealed pressure chamber contiguous with the bellows, but out of fluid conducting relation with the interior thereof; a liquid completely filling the casing and the reservoir; and a volatile fluid in said pressure chamber for exerting a pressure on said bellows to elevate the pressure of the liquid in said casing and said reservoir to create a pressure drop across said seal from the interior of the casing; the amount of volatile fluid being such with respect to the size of the presure chamber as to provide both a vapor and a liquid phase in said pressure chamber.

6. In a submersible structure: a motor having a shaft; a substantially cylindrical casing surrounding said motor; a first bracket for one end of said casing, said shaft extending through said bracket; means carried by said first bracket forming a seal between said shaft and the exterior of said first bracket; a second bracket for the other end of said casing, said second bracket being of cup shaped configuration facin longitudinally outward of said casing, said second bracket bein adapted to carry a bearing structure for the end of the shaft, said second bracket forming a space beyond said shaft and aligned therewith, said space being in communication with the interior of said casing; a plate accommodated on the open portion of said second bracket, said plate having an apertured boss extending outwardly of said space and aligned with said shaft; a flexible bellows acocmmodated on said boss, the interior of said bellows being in communication with said space; said bellows, said casing, and said space being adapted to contain an inert fluid; a housing surrounding said bellows and secured to said second bracket, said housing forming a sealed pressure chamber for said bellows; and a volatile fluid in said pressure chamber for exerting a pressure on said bellows to elevate the pressure of said inert fluid to create a pressure drop across said seal from the interior of the casing; the amount of volatile fluid being such with respect to the size of the pressure chamber as to provide both a vapor and a liquid phase in said pressure chamber.

References Cited in the file of this patent UNITED STATES PATENTS

Patent Citations
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2739252 *Feb 11, 1953Mar 20, 1956Red Jacket Mfg CoImmersible electric motor
US2885964 *Mar 18, 1957May 12, 1959Tait Mfg Co ThePumps
US2959133 *Sep 23, 1957Nov 8, 1960Allis Chalmers Mfg CoHermetically sealed pump motor unit
US3075469 *Jan 3, 1961Jan 29, 1963Red Jacket Mfg CoMotor construction
US3195468 *May 10, 1963Jul 20, 1965 Submersible pump
US3211935 *Dec 4, 1962Oct 12, 1965Gen Motors CorpSubmergible motor and electrical system
US3241492 *May 19, 1964Mar 22, 1966Reda Pump CompanyBreathing attachment for use during shipment of oil filled submergible motor and pump assemblies
US3289595 *Aug 20, 1965Dec 6, 1966Leuna Werke VebHigh pressure canned motor pump
US3418936 *Dec 5, 1966Dec 31, 1968Franklin W. DowdicanPump
US3552419 *May 6, 1969Jan 5, 1971Clement Walker Weston JrDeep submersible power assembly
US4010392 *Jan 20, 1975Mar 1, 1977Alexandr Antonovich BogdanovSubmersible motor
US4492523 *Feb 10, 1984Jan 8, 1985Hughes Tool CompanyToroidal inductor for a pressure sensor in a submersible pump
US4614482 *May 5, 1982Sep 30, 1986Klein, Schanzlin & Becker AktiengesellschaftPressure equalizing device for the electric motor of an encapsulated motor-pump assembly
US4906166 *Nov 4, 1987Mar 6, 1990Sundstrand CorporationLiquid coolant circulating system employing intergrated pump/accumulator
US4932848 *Oct 18, 1988Jun 12, 1990Kvaerner-Eureka A/SPump unit
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US5796197 *Dec 9, 1996Aug 18, 1998Franklin Electric Co., Inc.Submersible motor sealing system
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US6201327Nov 17, 1999Mar 13, 2001Camco International, Inc.System and method for absorbing the expansion and contraction of internal fluids of a sumergible electric motor
US6268672Oct 29, 1998Jul 31, 2001Camco International, Inc.System and method for protecting a submergible motor from corrosive agents in a subterranean environment
US8732908 *Feb 10, 2011May 27, 2014Sugatsune Kogyo Co., Ltd.Hinge with torque setting function
US8752674 *Dec 19, 2011Jun 17, 2014Vetco Gray Scandinavia AsSystem and method for momentary hydrostatic operation of hydrodynamic thrust bearings in a vertical fluid displacement module
US20120160327 *Dec 19, 2011Jun 28, 2012Vetco Gray Scandinavia AsSystem and method for momentary hydrostatic operation of hydrodynamic thrust bearings in a vertical fluid displacement module
US20130117967 *Feb 10, 2011May 16, 2013Sugatsune Kogyo Co., Ltd.Hinge with torque setting function
DE1174617B *Jul 28, 1960Jul 23, 1964Tait Mfg Co TheTauchpumpen-Motor mit fluessigkeitsgefuelltem Gehaeuse und einem drehzahlabhaengig betaetigten Schalter
EP0090411A1 *Mar 29, 1983Oct 5, 1983AlsthomSubmerged motor pump assembly
Classifications
U.S. Classification417/414, 277/337, 277/520, 310/87, 417/423.3, 415/901
International ClassificationF04D13/10
Cooperative ClassificationF04D13/10, Y10S415/901
European ClassificationF04D13/10