US1309282A - Planoorapii co - Google Patents

Description

. J. FRAME.

MULTISTAGE CENTRIFUGAL FAN AND PUMP.

APPLICATION FILED AUG-24. i918.

Patented July 8, 1919.

4 SHEETSSHEET l- 4 yP/v Tor flaaw THE COLUMBIA PLANOGRAPH C(L. WASHINOTON; D C.

W. J. FRAME.

MULTISTAGE CENTRIFUGAL FAN AND PUMP. APPUCATION FILED AUG-24,1918.

1,309,282. Patented July 8, 1919.

4 SHEETSSHEET 2.

Afr).

TIIE COLUMBIA PLANOURAPII cu" WASHINGTON. D. c.

.J. FRAME.

MULTISTAGE CENTRIFUGAL FAN AND PUMP.

APPLICATION FILED AUG-24.1918.

Patented July 8, 1919.

4 SHEETS-SHEET 3- ATT'YI THE COLUMBIA PLANOGRAPH cm. WASHINGTON. D. C.

W. J, FRAME.

mumsmss CENTRIFUGAL FAN AND PUMP.

APPLICATION FILED AUG-24. 1.9!8.

Patented July 8, 1919.

4 SHEETSSHEET 4.

ATT).

WILLIAM JOHNSTON FRAME, OF LONDON, ENGLAND.

MULTISTAGE CENTRIFUGAL FAN AND PUMP.

Specification of Letters Patent.

Patented July 8, 1919.

Application filed August 24, 1918. Serial N 0. 251,221.

To all whom it may concern 1 Be it known that I, WiLLIAM JOHNSTON FRAME, a subject of the King of England, and a resident of London MiddleseX, England, have invented certain new and useful Improvements in Multistage Centrifugal Fans and Pumps of which the following is a specification.

This invention relates to multi-stage centrifugal fans or pumps.

The object of this invention is to provide an improved fan or pump of this type. Ac cording to this invention I provide two or more separate sets or stages of fluid impelling blades or vanes in one or more rotors revolving in one compartment or chamber of a pump having one or more rotor compartments. s

The separate stages or fluid impelling blades act in series and each rotor compartment has at least two central fluid inlet eyes leading the fluid into at least two separate stages of fluid impelling blades revolving within that compartment. i

This invention is further characterized in that the fluid in passing to the central fluid inlet eye of a stage of rotor blading crosses the path of the fluid passing to another central inlet eye of another stage of rotor blading.

The fluid entering through any one of the central. inlet eyes into one rotor stage of impelling blades, is rotated by the blading, and is forced to issue from its periphery by the centrifugal action of same in the usual manner. The fluid then preferably enters diffusing channels or sets of stationary guide vanes of the well known type, and is returned through inward-flow guide passages back to another central inlet eye and passes. through this eye, into a second stage of rotor impelling blades.

The fluid is acted on in the above manner passing through the above cycle of flow and through the one rotor or rotors revolving in the one compartment of the pump two or more times in series, the pressure thus increasing.

Where the fluid passing to one central inlet eye of one rotor stage crosses the path of the fluid passing to another central inlet eye of another rotor stage the crossing of these fluid paths is preferably carried out through passages formed between the walls of the fixed return flow guide blades or passages which direct the fluid to the eye of a previous or subsequent stage.

The crossing of the paths of the fluid on the return inward flow part of the cycle of flow insures against loss of pressure head which occurs when the crossing of the fluid paths takes place on the outward flow part of the cycle.

The separate stages of fluid impelling blades of the rotor or rotors revolving in the one compartment of the pump may discharge the fluid in more than one direction, preferably either radial or parallel to the axis of rotation of the rotor or rotors.

The fluid impelling blades of the rotor of the improved pump may be backwardly inclined, radially or forwardly inclined desired, or they may be formed of a combination of any of these.

Referring to the drawings filed herewith:

Figure 1 is a half section and half elevation of a two-stage pump made in accordance with this invention showing a two stage single rotor having the inlet eyes of the rotor looking in. the same direction:

Fig. 2 is a half end elevation and half end View of Fig. 1 with the cover a re moved;

Fig. 8 is a half section and half elevation of a four-stage pump having two-stage 'rotors in two separate compartments with the inlet eyes of the rotors looking in the same direction; 7

Fig. l is a half section and half elevation of a four-stage pump having two twostage rotors back to back within, the one compartment;

Fig. 5 is' a half end elevation and half cross section on line 5-5, Fig. i;

Fig. 6 is a half section and half elevation of a four-stage pump having two two-stage rotors back to back within the one coinpartment, each of the rotors having one of its discharges at the periphery looking in an axial direction and the other discharge looking in a radial direction;

Fig 7 is a half section and half elevation of a two-stage pump having a single rotor running in one compartment with two central inlet eye looking in two directions each of the two stages having two central inlets into it.

Fig. 8 is a half section and half elevation k a I of a three-stage pump having one threestage rotor in the one compartment with two eyes looking in one direction and one eye in the opposite direction, and having the discharge annulus or scroll formed between the diffuser of the last stage but one and the return inward flow passages to the last stage.

Fig. 9 is a half end elevation and half cross section on line 99 of Fig. 8, showing discharge annulus or scroll outlet passing through the passage way leading from the delivery of the last stage but one to the inlet of the last stage;

Fig. 10 is a half section and half elevation of a three-stage pump having one twostage rotor in one compartment and one single stage impeller in a second compartment;

Fig. 11 is a half section and half elevation of a four-stage pump having two twostage rotors in two separate compartments and having their inlet eyes looking in opposite directions also the pump discharge disposed outside the return inward-flow passages to the last stage so that the fluid flows from the bladed annulus (formed between the diffuser of the last stage but one and the return inward-flow passages to the last stage) through passages formed between the walls of the fixed blades of the said inward flow passages to the said discharge;

Fig. 12 is a half section and half elevation of a five-stage pump having one threestage rotor with two inlet eyes lookingin one direction and a third eye in opposite direction within one compartment and one two-stage rotor with inlet eyes looking in opposite directions within a. second compartment;

Fig. 13 is a half end elevation and half cross section on line 1313, Figs. 10, 11 and 12, the dotted lines showing the dis charge in the examples shown in Figs. 11 and 12.

a is the casing provided with a cover a, Z) the shaft mounted on ball bearings c, d is the inlet and e the discharge.

In the form shown in Figs. 1 and 2, the rotor is a two-stage rotor and is provided with two sets of fluid impelling blades g and h leading from two separate central and contiguous inlets j and 7c. The casing a is provided with an annular diffusing chamber m into which the first set of blades 5/ discharge and return inward-flow passages bounded on two sides by walls 0 0 of the fixed blades. Between the walls 0 0 are ducts 79, see Fig. 2.

The blades h of the second stage of the rotor deliver the fluid into a diffusing annulus g and thence to the delivery scroll 1".

In operation the fluid enters the casing a at (Z, passes into the annular chamber .9, through the ducts p to the annular chamber t and thence to the eye of the first stage of the rotor. The fluid then passes through the first stage of the rotor and into the diffusing chamber m, then through the return inward-flow passages n to the eye k of the second stage of the rotor from which it is delivered to the diflusing chamber 9 and scroll r.

The form shown in Fig. 3 is a duplication of the form shown in Figs. 1 and 2. After the fluid leaves the second stage of the rotor 72. it enters the diffuser g and chamber 8 which is provided with fixed guide blades 8 passes through the ducts between the walls of the return inward-flow passages a into the eye of the third stage, then takes a course similar to that which it took in passing through the first stage. The fluid is delivered through the diffuser annulus g to the scroll r and outlet 6.

The form shown in Figs. 4 and 5 is similar to the form shown in Fig. 3 excepting that the rotor of the third and fourth stages is back to back with the rotor 01" the first and second stages. The fluid after leaving the second stage it of the first rotor is delivered through diffuser g to the annular chamber or scroll to from the discharge outlet w of which it is conveyed by a pipe 2 to the fluid inlet into third stage and the annular chamber 3. The fluid then passes through the ducts between the walls 0 of the fixed guide blades of the return inward flow passages (see Fig. 5) taking a course similar to that taken through the first two stages of the pump and discharging into and through the annular chamber or scroll 1 and outlet 6. Instead of there being two rotors back to back, the four stages could be carried in a single rotor with a central rib.

The form shown in Fig. 6 is similar to the form shown in Fig. 4 but each rotor has one of its discharges 6 and 7 looking in an axial direction and the other discharges 8 and 9 looking in the radial direction. This is applicable to all rotors of improved pump.

The form shown in Fig. 7 is similar to that shown in 4 excepting that the fluid enters through the casing inlets (Z cl at the one pressure. The fluid passes then through the ducts 29 (see Fig. 5) in the return flow guide blades and in through the central inlet eyes 7' j into the two outer sets of rotor blades 9 g which form the first stage. The fluid passes out of the first stage blading into the annuli m m and through the return flow guide passages 01. n into the two central inner inlets 7:: 7c and into the second stage blading h h from which it issued into the single annulus g and scroll n passing out at the one discharge 6.

The pressure of the fluid passing through the two outer sets of rotor blades g 9 forming the first stage is therefore the same.

Also the pressure of the fluid passing through the two inner sets it h is the same and therefore each of the two stages of this pump has two central inlet eyes leading into it.

Two or more of the two stage pumps as shown in Fig. 7 may work in series on one driving shaft. 7

The form shown in Figs. 8 and 9 is a combination of the form shown in Fig. 1 with a third stage on the back of the same rotor, or a separate rotor may be used for the third stage with its back to the first rotor."

In the form shown in Figs. 10 and 13the fluid after passing'through the first set of "rotor blades passes through the dif 7 charge fusing chamber m, through the return inward flow passages 3 to the eye is of the second stage of rotor blades, through which it passes into the diffusing chamber g and bladed annular chamber 1 1, through the ducts p see Fig. 13, disposed between the walls of the fixed guide blades of the inward return flow passages 3 through the annular chamber 15 to the eye 16 of the third stage, through the third set of rotor blades 17 to the discharge annulus 18 and dis- Each fixed blade in chamber 14 is shown at s Fig. 13, as an extension of one of the walls 0 of one of the fixed guide blades forming the passages 3.

In the form shown in Figs. 11 and 13 the course of the fluid through the first two stages is similar to that described with reference to the first two stages of Fig. 10. After leaving the second stage h of the first rotor the fluid passes into and through the bladed annular chamber 14, through ducts 7), see Fig. 13, disposed between the walls of the fixed blades of the return inward flow passages 3 through the chamber 20, then through the third and fourth stages of the second rotor into and through the bladed annular chamber 21 with blades .9 see Fig. 13 through the ducts disposed between the Walls of the fixed guide blades of the return inward flow passages n and annulus s to the pump discharge 6 disposed outside the return inward flow passages 3.

The form shown in Figs. 12 and 13 is a five-stage pump. The fluid passes through the first three stages in a manner described with reference to Figs. 8 and 9. After leaving the third-stage of the first rotor the fluid passes into and through the bladed annular chamber 22 with blades 3 through ducts 20 see Fig. 13, disposed between the walls of the fixed guide blades of the return inward flow passages 3 into and through the chamber 20, then through the fourth and fifth stages in a manner described with reference to Figs. 11 and 13.

It will be readily seen that other combinations can be obtained without departing from the spirit of the invention.

lVliat I claim and desire to secure by Letters Patent is 1. A centrifugal multi-stage fan or pump comprising a casing, at least one rotor compartn'ient in said casing, at least one rotor in said rotor compartment, a plurality of separate sets of rotor fluid impelling blades acting in series in said rotor compartment, return'inward flow fluid guide passages in said casing, cross fluid passages disposed transversely of the said inward flow fluid pas sages, said inward flow fluid passages leading the fluid to one of the separate sets of rotor fluid impelling blades and said cross fluid passages conveying the fluid to another of the separate sets of rotor fluid impelling blades.

2. A centrifugal multi-stage fan or pump comprising a casing, at least one rotor compartment in said casing, at least one rotor in said rotor compartment, a plurality of separate sets of rotor fluid impelling blades acting in series in said rotor compartment, return inward flow fluid guide passages in said casing, cross fluid passages disposed transversely of the said inward flow fluid passage, said inward flow fluid passages leading the fluid to one of the separate sets of rotor fluid impelling blades and said cross fluid passages conveying the fluid to another of the separate sets of rotor fluid impelling blades, said separate sets of fluid impelling blades act in series in any one rotor compartment of the pump and have at least two separate central fluid inlet eyes into said separate sets of rotor blading, one of the eyes being formed as an annulus contiguous outside another.

3. A centrifugal multi stage fan or pump comprising a casing, at least one rotor compartment in said casing, at least one rotor in 1 said rotor compartment a plurality of separate sets of rotor fluid impelling blades acting in series in said rotor compartment, return inward flow fluid guide passages in said casing, cross fluid passages disposed transversely of the said inward flow fluid passages, said inward flow fluid passages leading the fluid to one of the separate sets of rotor fluid impelling blades and said cross fluid passages conveying the fluid to another of the separate sets of rotor fluid impelling blades, said separate sets of fluid impelling comprising a casing, at least one rotor compartment in said casing, at least one rotor in said rotor compartment, a plurality of separate sets of rotor fluid impelling blades acting in series in said rotor compartment, guide blades in said casing forming return inward flow fluid passages, cross fluid passages in said guide blades, said inward flow fluid passages leading the fluid to one of the separate sets of rotor fluid impelling blades and said cross fluid passages conveying the fluid to another of the separate sets of rotor fluid impelling blades.

5. A centrifugal multi-stage fan or pump comprising a casing, at least one rotor compartment in said casing, at least one rotor in said rotor compartment, a plurality of separate sets of rotor fluid impelling blades acting in series, in said rotor compartment, return inward flow fluid guide passages in said casing, cross fluid passages disposed transversely of the said inward flow fluid passages, said inward flow fluid passages lead-.

ing the fluid to one of the separate sets of fluid impelling blades of a rotor in one compartment of the pump and said cross fluid passages conveying the fluid to one of the separate sets of rotor fluid impelling blades in another rotor compartment of the pump.

In testimony whereof I have signed my name to this specification. V

lVILLIAlVI JOHNSTON FRAME.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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