Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2612845 A
Publication typeGrant
Publication dateOct 7, 1952
Filing dateApr 29, 1950
Priority dateApr 29, 1950
Publication numberUS 2612845 A, US 2612845A, US-A-2612845, US2612845 A, US2612845A
InventorsCameron Byram Frederick, Zimmer Jr George H
Original AssigneeRobbins & Myers
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Helical gear pump with nonrigid casing
US 2612845 A
Abstract  available in
Images(2)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Oct. 7, 1952 F, Q BYRAM ETAL 2,612,845

HELICAL GEAR PUMP WITH NONRIGID cAsING Filed April 29, 195o 2 SHEETS-SHEET ll IN VEN TORS. fkfaER/CK C, Bye/:M "7" 650,96 ZMMEQJA.

mu @i ATTORNEYS.

Oct. 7, 1952 F. c. BYRAM ETAI HELICAL GEAR PUMP WITH NONRIGID QAsING 2 SHEETS--SHEET 2 Filed April 29, 1950 ATTORNEYS.

Patented Oct. 7, 1952 HELIGAL'GEARLPUMP WITH NONRIGID CASING llircderickl Cameron Byram; New Carlisle; and

GeorgeH; Zimmer, Jr.,

Springfield; Ohio, aS.'-V

signors to Robbins-dvMyers; Inc., Springfieldjv Ohio, a vcorporation of Ohio'.y

ApplicatonAprilZS, 1950, Serial No. 159,079

13 Claims;l (Cl. 41034-1171) This Yinvention relates to'a .helical gear'pump having anon-rigid casing., The partcularpump to which the invention is appliedis a pump of the type disclosed lby R. J. L. Moineau in his Patentl No. 1,892,217 of VDecember 27, 1932. This pumpis of the type having a stator member with internalhelical grooves or threads and'arotor member with'external helical grooves or threads, the stator member having one threadmore than the rotor member. It is one of the characteristics of a'pump of this type that if the rotor is rotated on itstrue center the stator member orbits 'or wobbles7 about the rotor kmember vin va cylindrical path.

Itis an object'ofthe present invention to provide a pump of the type'outlined above for direct connection to an electriomotorl which-pump will be very much'cheaper than any'pump 4of this type known'heretofore.- Itv isanother object of the present 'invention-'to provide integrally with the :stator member of the pump a member which serves as a portion of the pump casing and intake ordischarge whereby an actual pump casingin the'conventi'onal sense is eliminated', thereby eX- hibiting; asubstantial decrease in manufacturing costs..

Other'obj'ects of the invention include" the provision'v of 'apump as outlined'whioh in addition' to its lower cost will'be lighter and lsmallerthan` other pumps of this nature heretofore known.

These and other objects of. 'our invention which will be :apparent to those 1 skilled in. the art'uponreading .these specifications or which we 'shall describe in greater detail. hereinafter we y accom-- plish by that certain constructionmand arrangement of parts of which Vwe shall now describe certain exemplary embodiments.

Reference is made tothe drawings Vforming a p'art'hereof and in which:

Figure 1 is a plan view of one .embodiment of a pump and motor according to the invention.

Figure 2v is `across sectional view taken on the line 2--2-of Figure 1.

Figure 3f`is an exploded' -View of la portion'of thelmotor casing 'and a portion of' the pump showing the manner of attachment.

Figures and-.5 are fragmentary cross sectional views showing modifications in the manner of attachment.

Figure' `6 Iis- 1a cross-sectional View of another embodiment.

Briey, in.the..practicef=of ourinvention we mold the pump stator `together with an inlet vor outlet extension, if required, and the-major por#l tion of the pump casing'in onepiece from'are^`A silient material suchzasrubber :orA the like:U The` 2. open end ."Qf the pump casing portion vwhich surroundsthestato'r .portionis closed by a shallow panelke head. which is providedfwith' a' shaft entrance` opening'and 'sealing means 'forthe shaft and which' is alsoprovidedwith an'aperture for an inletor` outlet port for 'the pump.' The two pump casingjportions are 'securedv together by an annular joint 'and the pumpas a whole is secured to an annular extension vofthe motor casing so that the pump issecured at only the one annular locus. Because of the `resilience ofthe casing portion of vthe `stator th'ejstator'portion itself is free tofollow the path, ofV movement- 'enforced upon it anda casinginj the usual sense lof the wordy is rendered -unnecessary: Such a casing may, however, be provided'as shown in'Figure 6,' if' it, is'desir'ed to conceal-'the 'wobblingfofthe stator.

In thedrawings, referring-now' particularh'ri to Figures yle'to 3 inclusive, themotor is generally referred to atl0,' and the" pump is generally-re-- ferred to'at II.' The motorlll is 'preferablyprovided with an annular frame-extension indicated at f I 2 to which the lpump 'is annularly secured.'

The stator element of the pump-is indicated at' I3 and, as willlbe-clear from' .an examination ofl 'Fig-urer 2, it is provided vwith 'aport extension at I4 Whichr' is substantially coaxial with the statorportionr I 3 and it is also provided lwithaconic'a'l casing portion' I5' which surroundsth'e stator portion I 3. and extends 'slightly' beyond the end of the stator portion I3. The :conical casingportion :I 5. is .provided rfwithfan' annular 'flange I E, and .preferably the flange 16 is-provided with an annularfbead I l.l

The open end of f the fconicaly portion-'I5 is :closed by a; shallowpan=lileheadz Iawhich may beof lighti-gauge'sheetimetal Iorthe like vandwhich has anY .aperture to -permitentry of the vmotor shaftl Ilia. Azcollarfmember I9isif preferably welded tothe .headlportion lei-about `the 'shaft aperture andthe-:shaft preferably is.` provided' with a rgroove 20 lin 'which-1a snapfring 2'I` may engage. Between the collar-vlaaandflthe snap ring 2li` therefis :provided 'azsealing arrangement which may be; ofiinore o1'. `less:fconventionaiI design, Aern-` tody'ingt alga-suer, Zaans resilient member 23 heldin'.extendedicondition'by 'aspring 2411 The ange Aof' .the resilientfmernber l"lit#bears against the fsnapring 2 If 'and thespring urges the gasket 22 :against fthe *collar I 9 '.thuseffectively sealing the shaft "entrancey opening 'in the head I 8.

A port 'fitting 'f2'51may-be fbrazed, welded "or oth'-l erwise-suitably tsecur'e'd' yinto a port ope'nlrg'ZB' in thefheadzl' It will 'befclear that the 1l'wof fluid throughgthepump lmayrbeeith'er from right to left or left to right in Figure 2 depending upon the direction of rotation of the motor shaft Illa.

The rotor member 21 is preferably secured to the motor shaft Ina by a threaded stud 28 on the end of the motor shaft engaging in a threaded bore in the rotor 21.

Assembly may be accomplished in a number of ways, as shown in Figures 3, 4 and 5. The head member I 8 may be first secured in place and then the rotor 21 may be assembled to the motor shaft Illa. Thereupon the conical portion I may be secured to the head I8, as shown in Figure 3, by an annular grooved ring 29 (the grooves embracing the bead I1 and the head member I8 having a groove member I8a also to accommodate the bead I1) and the ring having an annu` lar extension with suitable holes for the passage of securing bolts 30.

In Figure 4 there is shown a modification wherein the flange of the head member I8 is extended annularly as shown in broken lines at |811 and the flange is first secured in place by means of screws or the like at 3|. Thereafter the extensions portion IBb is spun over to the position shown in full lines at I8c, thus clamping the flange I6 and bead I1 to the head member I 8.

In Figure 5 there is shown a still further modification where an annular clip member 32 is also secured by means of the screws 33 and thereafter the extension I8d of the head flange is spun over to the position shown at I8e.

In operation, when the motor rotates, thus rotating the pump rotor 21, the pump stator I3 is caused to move in a cylindrical path about the axis of the shaft Illa. The resilience of the conical portion I5 of the stator member permits this movement and thus the pump is secured to the motor only in the region of the annular joint between the conical portion I5 and the head member I8. The port extension I4 may be secured in any desired manner to a hose line or the like and, as pointed out above, may serve either as an entrance or exhaust port. The same is true of the fitting 25. In operation thus the entire portions I5 and I4, as observed from the outside, will appear to vibrate at relative high speeds. The pump however is completely sealed from the exterior and has been found to function very efiiciently. Since the casing in the conventional sense of the word has been eliminated, the pump is very much lighter and cheaper than any heretofore available.

Since the port fitting I4 will wobble in a cylindrical path along with the stator I3 the hose connections to the fitting I4 will be continually moved. Thus it may be desirable for some purposes that the port fitting remain fixed, and to this end we have shown a modification in Figure 6 wherein the port fitting I4 has been removed from the end of the stator member and the stator member together with its funnel-like casing portion I5, as shown in Figure 2, has been enclosed within a dome-like casing to which a fixed port fitting is secured.

Referring therefore to Figure 6 we have shown the stator I3 with its funnel-like casing portion I5 as before, and the funnel-like portion I5 is provided with the annular flange I6 having the bead I1 as described above. Again the open end of the funnel-like casing portion I5 is closed by a relatively shallow pan-like member indicated at 40 having an annular flange 4I terminating peripherallv in a groove 42 for engagement with the bead I1. The member 40 is provided with a port fitting at 43 which may be brazed in place as shown at 44. The member 40 is provided with a central flanged aperture for the passage of the drive shaft from the motor and the annular fiange 45 serves as a support and fastening element for the seal indicated generally at 48. Since the seal forms no part of the present invention it will not be described in detail. The head 40 is suitably secured to a bracket 41 which carries the bearings 48 for the drive shaft 49. The drive shaft 49, as before, may have the threaded end 50 for engagement in the threaded hole 5I of the rotor 21. Thus far in all essential respects the device of Figure 6 is the same as that of Figure 2. It will be observed however that the port fitting I4 has been omitted from the end of the stator I3 and that a member 52 has been provided in the nature of a casing. The member 52 is provided with a peripheral flange 53 which terminates in the annular peripheral groove 54 matching the groove 42 of the head. In assembly the two grooves 54 and 42 embrace the annular bead I1 and these elements are held in assembled relation by means of the clamping ring 55 as shown. The clamping ring 55 may be provided with upstanding ears 56 clamped together by means of nut and bolts indicated generally at 51.

The casing member 52 may be spun or drawn from relatively light gauge sheet metal and may have secured thereto, as by brazing or otherwise, the port fitting 58.

It will be clear that the only significant change from the device of Figure 2 is in the provision of a supplementary casing 52 with a fixed port fitting.

It will be clear that numerous modifications may be made without departing from the spirit of our invention, and we therefore do not intend to limit ourselves in any way whatsoever except as set forth in the claims which follow.

Having now fully described our invention, what we claim as new and desire to secure by Letters Patent is:

1. A stator for a helical gear pump, comprising an internally helically grooved cylindrical member, and a conical casing member, said casing member, at its small end, merging with one end of said cylindrical member, and towards its large end fiaring away from said cylindrical member over substantially the length of said cylindrical member, said stator being of resilient material.

2. A stator according to claim l, having a tubular extension substantially coaxial with said cylindrical member, and extending oppositely to said conical casing member, said extension constituting a port fitting.

3. A stator for a helical gear pump, comprising an internally helically grooved cylindrical member, and a conical casing member, said casing member, at its small end, merging with one end of said cylindrical member, and towards its large end flaring away from said cylindrical member over substantially the length of said cylindrical member, and having at its flaring end an annular beaded fiange, said stator being of resilient material.

4. A stator according to claim 3, having a tubular extension substantially coaxial with said cylindrical member, and extending oppositely to said conical casing member, said extension constituting a port fitting.

5. A helical gear pump comprising a stator member constituted of an internally helically grooved cylindrical member, and a conical casing member, said casing member, at its small end, merging with one end of said cylindrical memring for said pump.

ber, and towards its large end flaring away from said cylindrical member over substantially the length of said cylindrical member, said stator being of resilient material, a pan-like casing element for closing the flaring end of said casing member, said pan-like casing element having a shaft entrance opening and having also a port opening for said pump, a shaft entering said shaft entrance opening, and an externally helically grooved rotor element secured to said shaft within said casing members, said one end of said cylindrical member constituting also a port opening for said pump.

6. A pump according to claim 5, wherein a tubular extension constituting a port fitting is provided on said cylindrical member substantially coaxial therewith, and extending oppositely to said conical casing member, and wherein said pan-like element and conical element together constitute the entire pump casing.

7. A pump according to claim 5, wherein there is provided a covering member secured to said pan-like element and covering and concealing said stator member, said covering member having a port fitting.

8. The pump of claim 5 in combination with an electric motor, said shaft being the shaft of said motor, and said motor having an annular frame extension, and said casing elements being annularly secured to said frame extension.

9. A helical gear pump comprising a stator member constituted of an internally helically grooved cylindrical member, and a conical casing member, said casing member, at its small end,

merging with one end of said cylindrical member, and towards its large end flaring away from said cylindrical member over substantially the length of said cylindrical member, said stator being of resilient material, a pan-like casing element for closing the flaring end of said casing member, said pan-like casing element having a shaft entrance opening and having also a port opening for said pump, a shaft entering said shaft entrance opening, and an externally helically grooved rotor element secured to said shaft within said casing members, said one end of said cylindrical member constituting also a port opensaid conical casing member and pan-like casing element being joined and sealed annularly. and said pump being xed to a 6 support annularly in the region of said annular joint.

10. A pump according to claim 9, wherein a tubular extension constituting a port fitting is provided on said cylindrical member and substantially coaxial therewith, and wherein said pan-like element and conical element together constitute the entire pump casing.

11. A pump according to claim 9, wherein there is provided a covering member secured to said pan-like element and covering and concealing said stator member, said covering member having a port fitting.

12. The pump of claim 9 in combination withA an electric motor, said shaft being the shaft of said motor, and said motor having an annular frame extension, and said pump being secured to said annular frame extension in the region of said annular joint.

13. A helical gear pump comprising an externally helically grooved rotor element, means for rotating said rotor element on its true axis, a stator member comprising an internally helically grooved cylindrical element, and means mounting said stator member to permit the movement thereof in its enforced cylindrical path, said means comprising a casing portion of resilient material, secured adjacent an end thereof to said stator member, said casing portion being secured also to a second casing portion of rigid material, said rigid casing portion having a bearing for said rotor axis, and having a port opening.

FREDERICK CAMERON BYRAM. GEORGE H. ZIMNIER, JR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,233,599 Nuebling July 17, 1917 1,892,217 Moineau Dec. 27, 1932 2,505,136 Moineau Apr. 25, 1950 2,512,764 Byram June 27, 1950 2,512,765 Byram June 27, 1950 FOREIGN PATENTS Number Country Date 622,583 Great Britain May 4, 1949

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1233599 *Jul 27, 1915Jul 17, 1917Edward NueblingHelical piston-wheel.
US1892217 *Apr 27, 1931Dec 27, 1932Louis Moineau Rene JosephGear mechanism
US2505136 *Jun 18, 1946Apr 25, 1950Robbins & MyersInternal helical gear pump
US2512764 *Nov 5, 1946Jun 27, 1950Robbins & MyersHelical gear shallow well pump
US2512765 *Dec 20, 1946Jun 27, 1950Robbins & MyersRotary pump
GB622583A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2700936 *Oct 5, 1951Feb 1, 1955Thompson Prod IncFlexible helix rotor pump
US2733854 *Mar 22, 1952Feb 7, 1956 chang
US2765114 *Jun 15, 1953Oct 2, 1956Robbins & MyersCone type compressor
US2826152 *Aug 30, 1955Mar 11, 1958Robbins & MyersHelical gear pump with bellows stator
US2842961 *Sep 16, 1954Jul 15, 1958Schlumberger Well Surv CorpFlow measurement in wells
US2862454 *Jun 24, 1955Dec 2, 1958Robbins & MyersHelical gear pumps
US2957427 *Dec 28, 1956Oct 25, 1960Walter J O'connorSelf-regulating pumping mechanism
US3101171 *Feb 27, 1961Aug 20, 1963Ingersoll Rand CoAxial flow compressor
US3104615 *Oct 7, 1960Sep 24, 1963Netzsch GebWorm pump
US3280753 *Aug 13, 1964Oct 25, 1966Robbins & MyersPump with eccentric driven stator
US3643877 *Jan 28, 1970Feb 22, 1972Robbins & MyersPump with macerator
US4325682 *Dec 12, 1979Apr 20, 1982E. I. Du Pont De Nemours And CompanyApparatus for discharging material
US4558954 *Dec 12, 1984Dec 17, 1985Barr Robert AExtruder screw and positive displacement wave pump assembly
US4923376 *Mar 24, 1988May 8, 1990Wright John LMoineau pump with rotating closed end outer member and nonrotating hollow inner member
US5305923 *Feb 28, 1992Apr 26, 1994The Coca-Cola CompanyPostmix beverage dispensing system
US5494193 *Jan 10, 1994Feb 27, 1996The Coca-Cola CompanyPostmix beverage dispensing system
US5615801 *May 18, 1995Apr 1, 1997The Coca-Cola CompanyJuice concentrate package for postmix dispenser
US5735436 *Jan 21, 1997Apr 7, 1998The Coca-Cola CompanyJuice concentrate package for postmix dispenser
US5779460 *Jun 7, 1996Jul 14, 1998Ici Canada Inc.Progressive cavity pump with tamper-proof safety
US5842603 *May 18, 1995Dec 1, 1998The Coca-Cola CompanyPostmix juice dispenser
US6358027Jun 23, 2000Mar 19, 2002Weatherford/Lamb, Inc.Adjustable fit progressive cavity pump/motor apparatus and method
US6457958Mar 27, 2001Oct 1, 2002Weatherford/Lamb, Inc.Self compensating adjustable fit progressing cavity pump for oil-well applications with varying temperatures
US6460734 *Aug 8, 1996Oct 8, 2002Lancer PartnershipDispensing apparatus including a pump package system
US6622381Nov 30, 2001Sep 23, 2003Moyno, Inc.Method of manipulating a pump
US6651849 *Sep 4, 2002Nov 25, 2003Lancer Partnership, Ltd.Dispensing apparatus including a pump package system
US6912764May 8, 2003Jul 5, 2005Moyno, Inc.Stator tube removal and installation device
US7178749Jan 11, 2005Feb 20, 2007Moyno, Inc.Pump with cutting assembly
US7214042 *Sep 23, 2004May 8, 2007Moyno, Inc.Progressing cavity pump with dual material stator
US7553139Oct 1, 2007Jun 30, 2009Moyno, Inc.Progressing cavity pump with wobble stator and magnetic drive
US7556214Dec 13, 2006Jul 7, 2009Moyno, Inc.Cutting assembly
US7607903Apr 29, 2005Oct 27, 2009Moyno, Inc.Stator tube removal and installation device
US8182252Oct 30, 2007May 22, 2012Moyno, Inc.Progressing cavity pump with split stator
US8210827Oct 30, 2007Jul 3, 2012Moyno, Inc.Sanitary pump assembly
US8215014Oct 31, 2007Jul 10, 2012Moyno, Inc.Method for making a stator
US8246477May 20, 2010Aug 21, 2012Moyno, Inc.Gear joint with super finished surfaces
DE947666C *May 16, 1954Aug 23, 1956Hoover LtdSchraubenpumpe
Classifications
U.S. Classification418/48
International ClassificationF04C2/107, F04C2/00
Cooperative ClassificationF04C2/1076
European ClassificationF04C2/107B4