US1229274A

US1229274A - Duplex centrifugal pump.

Info

Publication number: US1229274A
Application number: US11368816A
Authority: US
Inventors: Robert K Jack
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-08-08
Filing date: 1916-08-08
Publication date: 1917-06-12
Anticipated expiration: 1934-06-12

Description

R. K. JACK.

DUPLEX, CENTRIFUGAL PUMP.

APPLICATION FILED Aue.a,191a

ygyg Patented June 12, 1917.

2 SHEETS-SHEET I.

{NVENTOR ATTORNEYS R. K. JACK. DUPLEX CENTRIFUGAL PUMP.

APPLICATION FILED AUG.8, 1916.

Patented June 12, 1917.

2 SHEETS-SHEET 2.

WITNESSES: @a/wf nomini: n. JACK, or NUTLEY, NEW JERSEY.

'DUPLEX CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented June i2, i917.

Application filed August S, 1916. Serial No. 113,688.

To all 'whom t may concern:

Be it known that I, ROBERT K. JACK, a subject of the King of Great Britain, residing at Nutley, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Duplex Centrifugal Pumps; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to characters of reference marked there,- on, which form a part of this specification.

The present invention relates, generally, to improvements in fiuid pumps; and the invention has reference, more particularly, to a novel construction of centrifugal pump.

The present invention has for its principal object to provide a very simple, compact. and eiiicient construction of duplex centrifugal pump which will provide for the discharge of two streams under the impelling force of a rotary impeller.

A further object of the present invention is to provide a novel construction and arrangement of duplex centrifugal pump which is particularly adapted for use in maintaining circulation in the cooling systems of the modern V-shaped miilti-cylinder gas-engine, now employed so extensivelyv as the power plant of autovehicles, aeroplanes, etc. ln such V-shaped multi-cylinder gas-engines, the cylinders are angularly disposed in two sets upon opposite sides of the crank-shaft thereof; consequently it is found to be the better and moreefficient practice to divide the circulation of the cooling medium serving such cylinders, which is obtained from a suitable radiator reservoir, into two separately circulating streams, one for each set of cylinders. My present invention, therefore, provides a very simple and compact construction of duplex centrifugal pump, which, through the rotation of a single driving-shaft and the impeller afiixed thereon, is adapted to control and force the circulation of two separate and distinct streams of cooling medium, with a minimum expenditure of power. Said novel duplex centrifugal pump will furthermore provide a proper equal iiow efficiency to each stream, so that each set of engine cylinders receives its proper and necessary share of cooling medium from the radiator constituting the source thereof.

A still further object of the present invention is to provide a duplex centrifugal pump so constructed and arranged that the impeller is subjected botli to an axial balanced pressure and a Ibalanced pressure at right angles to its axis during operation7 consequently reducing side thrust, and the friction induced thereby,` so that economy of driving power, and a more efficient utilization of said driving power is obtained.

@ther objects of the present invention, not at this time more particularly enumerated, will be clearly understood from -tlie following detailed description of the same.V

With vthe various objects of the present invention inview, the same consists, primarily, in the novel construction of duplex lcentrifugal pump hereinafter set forth; and

the invention consists, furthermore, in the novel arrangements and combinations of the various devices and parts, as well as in the details of the construction of the said parts, all of which will be more fully described in the following specification, and then finally embodied in the claims which are appended to and which form an essential part of the said specification.

The .invention is clearly illustrated in the accompanying drawings, in which:-

Figure l is a side elevation lor face view of the novel construction of duplex centrifugal pump, made according to and embodying the principles'of my present invention.

Fig. 2 is a top edge or plan view of the saine.

Fig. 3 is a horizontal section of the same, taken on line 33 in said Fig. l, looking downward.

Fig. 4 is a vertical cross section of the same on line 4-4-4 in said Fig. 3, looking in the direction of the arrow a'.

Fig. 5 is a side elevation of the novel construction of impeller, forming a part of my duplex centrifugal pump, the same being removed from the latter; and Fig. 6 is an edge view or elevation of the same.

Similar characters of reference are einployed in all of the hereinabove described views, to indicate corresponding parts.

Referring now to the said drawings, the reference character l indicates a complete duplex centrifugal pump, made according to and embodying the principles of my presbase or bracket 3. Said main body or casing 2 provides a centrally disposed chamber 4, in which the movable element of the pump, comprising a rotary impeller 5, is mounted. Located so as to extend around said chamber 4 are a pair of annular chambers a and b, which are divided or separated, one from the other, by a centrally disposed annular partition or wall 6. Said chambers a and b communicate with the impeller 5 by means of annular openings or passages 7 which extend around the periphery of said impeller 5. The annular chamber a is spirally enlarged from its point of beginning until it terminates in a discharge pipe 8, which extends toward the left hand at the upper side of the casing 2, and the annular chamber b' is spirally enlarged from the point of its beginning until it terminates in a discharge pipe 9, which extends toward the right hand, at the lower side of the vcasing'2. As thus disposed and arranged it will be noted that both annular chambers a and b extend spirally in the same annular direction, but that the point of beginning of the one is y diametrically opposite the point of beginning of the other, and that the discharge point of the one is diametrically opposite the discharge point of the other. The centrallyV disposed chamber. 4 .is preferably closed on one side by a side-wall 10, from which said baseor bracket 3 preferably extends, while the opposite side of said chamber 4 is provided with an internally screw threaded opening 11, in which is screwed an externally threaded cover-plate 12, which thus serves to normally close said chamber 4, but also permits, when removed, access to said chamber 4 for the insertion therein, or removal therefrom, of said impeller 5.

Formed in said side-wall r10 is a centrally disposed opening or intake port 13, communicating with one.v side of said lchamber 4. Formed preferably as an Aintegral part of said side-wall 10, so as to terminate at and communicate with said opening or intake port 13, is an intake 'or suction .pipe 14, extending transversely and outwardly therefrom.- In like manner. formed in said coverplate 12 is a centrally disposed opening or intake port 15, communicating with the opposite side of said'chamber 4. Formed preferably as an integral part of said coverplate 12, so as to terminate. at-and communicate with said opening or intake port 15, is an intake or suction pipe 16, extending transversely outwardly therefrom.

Integrally formed in the outer wal'l of said intake or suction pipe 14 is a gland 17, the outer end of which isthreaded to receive a stuffing-box 18. Mounted in said gland 17 is a bearing bushing or seat 19. In

within which is mounted a'bearing bushing or seat 21. Journaled vin said'arespective bearing bushings or seats- 19 and 21 is a' driving shaft 22. A suitable packing 23 is retained about said shaft where the same enters the bushing or seat 19 by the stuffing box 18, thus preventing leakage through the shaft-bearing. Said impeller 5 is fixed upon and driven by said shaft 22. Of course it will be understood that, if it is desired to extend said driving shaft 22 through said cover-plate 12, a gland and stuiing-box may be'substituted for said socket or thrust bearing-member 20.

trally disposed portion or wallY 26 spaced between its opposite outer side walls 27, so as to provide two sets of impeller passages a and b. The impeller passages a communicate, at their discharge ends located at the periphery of theimpeller, with the annular opening or passage `7 leading into said annular chamber a; and the impeller passages b communicate, at their discharge ends, with the annular opening or passage 7 leading into said annular chamber 72. Each side wall 27 of said impeller 5 is provided with a centrally disposed receiving or entrance port 28, which respectively communicate with said intakey port 13 on the one side of said chamber 4 and theintake port 15 onI the other side of said chamber 4. The impeller passages a and b lare formed by a series of 'radially disposed curved impeller vanes or zreceived into the impeller through its centrallyldisposed entrance ports 28 on each side thereof. It therefore follows that the pressure of each stream, thus entering the impeller upon opposite sides thereof, is balanced one by the other since the pressure of the iow of one, tending to .move the impeller axially in one direction, is counteracted by the pressure .of lthe oppositely directed vii'ow of the other, tending to move the impeller axially i-n an .opposite direction; consequently the impeller when rotated is sub-- jected to an axial balanced pressure greatly reducing side thrust or play and consequent increased friction by reason of such thrust against the bearing surfaces or seats 24 and 25. Each stream of fluid thus entering the interior of the impellei` is maintained sep'- arate from the other by said middle partition or wall 26. Consequently .the two streams of Huid entering the impeller are separately set in motion by the impeller vanes or blades 29 which contacting therewith set up the whirling or centrifugal action tending to forcefully eject the same therefrom and through the annular passages 7 respectively into the annular chambers a and Z7, the whirling force carrying the streams of fluid through said annular chambers a and b so that the same are forcibly discharged through the

respective discharge pipes

8 and 9 with considerable velocity. It will be understood that since the passages a and are spirally enlarged from `their points of beginning toward their discharge points at the

discharge pipes

8 and 9, the cross sectional areas thereof are constantly increasing toward such discharge points, and therefore the flow of the fluid displaced. or discharged about the entire periphery of the impeller is not choked or checked since the capacity of each chamber a and b is proportionally increased with the volume of discharge toward the exit through the

discharge pipes

8 and 9. An additional novel feature in the construction and relation of the chambers a and b, is found in their respective disposition or position relative to one another, whereby the points of their begining and discharge are diametrically opposite each other. Such disposition thereof tends to balance the pressure or reaction at the periphery of the impeller, and in lines at right angles to the axis thereof, since any pressure or reaction due to the discharge of the fluid at any particular point of the impeller is balanced by exactly the same pressure or reaction diametrically opposite, since the combined cross sectional area of the chambers a and b at one point of discharge f rom the impeller is exactly the same as the y combined cross sectional area of the said chambers a and b at a point of discharge from the impeller diametrically opposite thereto. By thus constructing the pump so as to eliminate unbalanced pressure upon itsimpeller either in the direction of its axis or at right angles thereto. it will be clearly evident that a very smooth and easy operation of the impeller is attained with a minimum degree of friction, and with a consequent economical conservation of driving power in proportion to the work accomplished by the ump.

A still further novel feature of construction embodied in my novel pump, which makes for beneficial results in the operation sage,

thereof, comprises the construction of the impeller 5 wherein the outside Walls 27 are provided. These Walls, in conjunction with the central wall 26 provide inclosures over the impeller' vanes or blades 28 whereby the impeller passages a and b are provided, thus providing an unobstructed free pasmoving with the stream of fluid impelled thereby, so that the mass of fluid does not have to be moved against a stationary surface with consequent friction, and tendency to cause impeding eddies therein which interfere with the free Centrifugal movement of the fluid. By reason of this novel construction the efficiency of the pump is increased, and a more efficient consumption of the power applied thereto for the operation thereof is attained.

-I am aware that some changes may be made in the several arrangements and combinations of the various devices and parts of my present invention, as well as in the details of the construction of the same, without departing from the scope of the said invention as set forth in the foregoing specification, and as defined in the claims appended thereto. Hence, I do'not limit my invention to the exact arrangements and combinations of the Various parts as described in the foregoing specification, nor do "l confine myself to the exact details of the construction of the said parts as illustrated in the accompanying drawings.d

1. In a device of the kind described, a casing provided with a pair of annular chambers spirally enlarged from their points of beginning toward their points of discharge, annular passages formed at the juncture of said annular chambers with the main body of said casing, the point ofl be.- ginning and point of discharge of one of said annular chambers being respectively diametrically opposite the point of beginning and point of discharge of the other annular chamber, a rotary impeller mounted Within said casing adapted to discharge Huid through said annular passages into said respective annular chambers to forcibly eject said fluid from the latter at their discharge points, and means for delivering fluid to said impeller.

2. In a device of the kind described, a casing provided with a pair' of annular chambers spirally enlarged from their points of beginning toward their points of discharge, annular passages formed at the juncture of said annular chambers with the main body of said casing, the point of beginning and point of discharge of one of said annular chambers being respectively diametrically opposite the point of beginning and point of discharge of the other annular chamber, said casing being provided in its sides with intake ports, intake or suction pipes connected with said casing so as to communicate with said intake ports, and a rotary impeller having radially disposed curved impeller vanes mounted within said casing in communication with said intake ports, said impeller being adapted to discharge the fluid received through said` intake ports peripherally through said annular passages into said respective annular chambers to forcibly eject said fluid from the latter at their discharge points.

3. In a device of the kind described, a casingprovided with a pair of annular chambers lspirally enlarged 'from their points of beginning toward their points of discharge, annular passages formed at the juncture of said annular chambers with the main body of said casing, the point of beginning'and point of discharge of one of said annular chambers being respectively diametrically opposite the point of beginning and point of discharge of the other annular chamber, said caslng being provided in its `sides with intake ports, intake or suction pipes connected with said casing so as to communicate with said intake ports, a rotary impeller having side walls, a central Wall dividing the interior of said impeller transversely of its axis to form Vtwo interior chambers open at the periphery of said impeller respectively to...communi cate with said respective annular passages leading to said annular chambers of said casing,`radially disposed curved' impeller' vanes extending through eacli interior chamber of said impeller,l and the sidewalls of said impeller having centrally disposed entrance ports communicating respectively with said intake portsof said casing.

4. In a device of the kind described, a casing providing a centrally disposed chamber, a fixed wall of said casing inclosingone side ofvl saidlcentral chamber, a removable cover-portion closing the other side of said central chamber, said* casing being provided with a pair of, annular chambers spirally enlarged from Atheir pointsiof beginning toward their-points of discharge, discharge pipes connected with said'casing and extending outwardly from the respective points of discharge of said annular chambers, said casing, being fur-` ther provided with .a pair of annular pas-l sages aiiording communication,between said central chamber and said respective annular chambers, the point of beginning, and point of discharge of one annular chamber being respectively diametrically opposite the point of beginning and point of discharge of the other annular chamber, a lrotary impeller mounted within said central @chamber of said casing adaptedA to discharge fluid through said annular assages into` said respective annular cham ers to forcibly eject said fluidA through said discharge pipes, a

driving shaft for operating said impeller,

' means connected with said casing and its cover-portion for journaling said shaft, and means for delivering fluid to said impeller.

5. In a device of the kind described, a casing providing a centrally disposed chamber, a fixed wall of said casing'inclosing one side of said central chamber, a removable cover-portion closing the other side of said central chamber, said casing being provided with a pair of annular chambers spirally'enlarged from their points ofbeginning to ward their points of discharge, discharge pipes connected with said casing and extending outwardly from the respective points of discharge of said annular chambers, said casing being further provided with a pair of annular passages affording communica-- tion between said central chamber and said respective annular chambers, the point of beginning and point of discharge of one annular chamber being respectively diametrically opposite the point of beginning and point of discharge of the other annular chamber, said casing being provided respectively in its side wall and cover-portion with centrally disposed intake ports, intake or.

suction pipes connected respectively with said casing and its cover-portion so as to communicate w1th sald intake ports, a rotary j impeller mounted within saidv central cham-A ber of said casing, the same having radially disposed curved impeller vanes, said impeller being adapted to discharge the fluid portion closing the other side of said central chamber, said casing being provided with a pair of] annular chambers spirally enlarged from their points of beginning toward their points of discharge, discharge pipes connected with said casing and extendlnfgoutwardly from the respective points of ischarge of said annular chambers, i said casing being further provided with a pair of annular passages ailording communication between said central Chamberland said respective annular chambers, the 4point of beginning and point of discharge' of. one annular chamber being respectively diametrically opposite the point of beginningandvpoint .of `discharge of the other annular chamber, said casing being provided respectively in its side Wall and cover-portion with centrallydisposed intake ports, intake or suctionl pi'p'esconnected respectively With said casing and its coverportion so as to communicate With said intake ports, a rotary impeller having side walls, a central Wall dividing the interior of said iinpeller transversely of its axis to, form two interior chambers open at the periphery of said impeller respectively to communication with said respective annular passages leading to said annular chambers of said casing, radially disposed curved impeller vanes extending through each interior chamber of said impeller, said side Walls of said impeller having centrally disposed entrance ports communicating respectively with said intake ports, a driving shaftV for 15 set forth above I have hereunto set my hand 20 this 3rd day of August, 1916.

ROBERT K. JACK.

Witnesses:

GEORGE D. RICHARDS, FREDK H. W. FRAENTZEL.