US1111498A

US1111498A - Turbo-blower.

Info

Publication number: US1111498A
Application number: US53482709A
Authority: US
Inventors: Max Rotter
Original assignee: Allis Chalmers Corp
Current assignee: Allis Chalmers Corp
Priority date: 1909-12-24
Filing date: 1909-12-24
Publication date: 1914-09-22
Anticipated expiration: 1931-09-22

Description

M. BUTTER.

TURBO BLOWER.

APPLICATION FILED DEC. 24, 1909.

. m R E m N. \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\5 o -m H w W m N .vm E T aw U Hi. V T M v .uov 8+ M W A M mm m I Y E & w 1, a 1 1. w L K0 UNITED STATES PATENT OFFICE...

MAX ROTTER, 0F MILWAUKEE, WISCONSIN, ASSIGNOR, BY MESNE ASSIGNMENTS, TO ALLIS-CHALMERS MANUFACTURING COMPANY, A CORPORATION OF DELAWARE.

TURBO-BLOWER.

Specification of Letters Patent.

Patented Sept. 22,1914.

Applicationfiled December 24, 1909. Serial No. 534,827.

This invention relates to improvements in the construction of regulating devices for turbo-blowers, and in particular to improvements in such devices used in connection with blowers furnishing con'ipressed air for blast furnaces or similar nn-poses.

The object of the invention is to provide a means for regulating turbo-blowers so that the blower will auton'iatically deliver a constantweight of air irrespective of the dischargepressure. It is often desirable, especially in blast furnace work, to have the blower which furnishes compressed air deliver an approximately constant weight of air against a variablepressure. This has heretofore been accomplished by varying the suction opening according to the speed of the blower, but the results thus obtained have not been entirely successful. With the present invention, the suction opening is not varied, there being a by-pass through which the superfluous air is returned to an intermediate stage of the blower.

A clear conception of the invention can be obtained by referrin to the accompanying drawing in which like reference characters designate the same or similar parts in different views.

Figure 1 is a central vertical section of a turbo-blower built according to the in-- vention, showing also the regulator for the prime mover of the blower. Fig. 2. is a central vertical section of a' modified form of pressure control of the by-pass valve.

In the device shownin Fig. 1, the main shaft 1 of the blower, which is preferably directconnected to the main shaft of the prime mover, not shown, carries a concenoutward to within a short distance from the caslng of

stationary blades

33, 35, 37, mounted thereon and alternating with the corre-- sponding sets of

rotatable blades

32, 34, 36, the

stationary blades

33, 35, 37, extending nwardly from the casing 5, and radially to The casing 5 has a series of sets the spindle 2, to within a short distance from the spindle 2.

The larger rotatable blades 32 are of about the same length as the stationary blades 33, the

blades

32, 33, comprising the first stage of the blower. The intermediate rotatable blades 34 are of about the same length as the stationary blades 35, the

blades

34, 35, forming the intermediate stage. The small rotatable blades 36 are of about the same length as-the stationary blades 3?, alternating therewith, the blades- 36, 37, forming the high pressure stage of the blower. It is not necessary to limit the number of stages in the blower to three, as shown, as any number of stages might exist. A return passage or by-pass 29 extends back from the discharge chamber 38 to an annular chamber 30 formed around the casing 5, between the first and the intermediate stages of the blower. The nozzles 31 connect the chamber 30 to the space within the blower between the first and intermediate stages thereof. A valve 28, having the valve stem 24, is located in the connection between the by-pass 29 and the chamber 30.

The stem 24 of the valve 28 has an arm 124 connected thereto having a slotted end 12. This arm 124 is connected at its end 12, by a link 11, to arm 10 of a bell-crank lever, the other arm 9 thereof being slotted at its end. The arm 9 is connected at its slotted end to a slide rod 95 guided in a bore in some stationary part 93 of the frame. The rod 95 has two lateral extensions 96, taking over the edge of a collar 97 on a sleeve 92, screw threaded in the part 93 of the frame for purposes of adshown, passes through the sleeve 92 and partially carries the bell-crank levers of fly balls 7 at its up er end as usual. Links connect the ends 0 the bell-crank levers to the governor collar 8. A spring 94 sur rounds the shaft 6 above the sleeve 92 and, rests upon said sleeve, its upper end abutnot shown. This lever 91 may be floating fits within the cylinder 221.

and operative upon a relay device such as 1s. common in the art, see for instance United States atent to Moore, 322,956, July 28, 1885. he governor shaft 6 1s connected by bevel gears 3, 4, to; the mam shaft 1.

In the modified form of by-pass and valve arrangement, see Fig. 2, there 1s no connection between the governor collar 8 and the by-pass valve 281. The thoroughfare through byass 291, connecting the discharge cham er 38 with the annular chamber 301, corresponding to the chamber in the first form described, is controlled by the valve 281. The valve 281 has an arm 241-on its valve stem connected to the end of the piston .rod 253 by a slotted head on the arm 241. The piston 251 is fixed to the opposite end of the piston rod 253 and A helical spring 252 coacts against the rod side of the iston 251 and against one of the cylinder eads. The head end of the cylinder 401 connects with the discharge chamber 38 of the blower through a pipe 402.

:During the o 'eration of the blower the rotary motion 0 the prime mover is transmitted'through the shaft 1 to the spindle 2.

The rotation of the spindle 2 causes the sets.

of

rotatable blades

32, 34, 36,120 rotate between adjacent setsof

stationary blades

33, 35, 37. This rotation of'the

blades

32, 34, 36, causes air to be drawn into the first stage through the suction opening 39 and to be forced through the first stage to the-intermediate stage, through the intermediate stage to the high pressure stage, and

I. through the high pressure stage to the discharge chamber 38. During the passage of the air through the various stages. it is gradually compressed until it is discharged in the chamber 38 at the highest pressure.

As heretofore stated, it is desired to maintain constant the weight of air compressed per unit of time independent of the pressure to which the compression extends. In order to increase thepressure of air discharged 7 so as to meet new requirements of the fur-- nace necessitatin' higher pressure of air,

-- the speed of the lower must be increased.

is done by adjusting by hand the sleeve 92 downwardly so-as to relieve some of the pressure of spring 94 on the governor col- \lar 8. When this is done it is also necessary to readjust't'he connection between the lever 91 and the main throttle so as'to afford a wider opening of the throttle at normal position of governor collar 8 than before if it is desired to maintain the normal position of'the collar 8 constant fordifierent,

adjustments. This relief of maintain governor collar 8 in normal POSI',

tion. The blower speed will correspondingly be increased and without any by-pass the weight of air compressed would be increased per unit of time. I In making this downward adjustment of the sleeve 92, the slide rod 95 is pulled downwardly, operating the linkage to open the valve 28 to a set position for the corresponding higher s eed. In this condition the blower will sen some of the discharge air back through the by-pass 29 and expanding nozzle- '31 to the intermediate stage of the blower as shown, though this return might be made at any point along the blower. This will cause a backing up of pressure at the point of reintroduction and less new air will enter the suction opening 39, to an extent sufiicient to maintain constant'the weight of air compressed per unit of time. In order to decrease the pressure of air discharged, the reverse sequence of operations is made to and does take place. a

In the modification of Fig. 2, the valve 281 will also be automatically regulated, but

in this case for any speed of .the blower whether brought about by manual setting of the governor or by small changes of speed from the normal speed for which the governor is set. The sleeve 92 having been set for a higher speed, the higher resulting dis-.

charge pressure will automatically open considering the rotor fixed whereupon air admitted through the nozzles would create an influx of air at-the suction end of the blower. It will be evident that the by-pass could connect any two points along the blower.

It should beunderstood that it is not desired to be limited to the exact details of construction shown and described,- for obvious modifications will occur to a person skilled in the art. 1 7

It is claimed and desired to secure by Letters Patent,

1. A turbo-blower having a casing, a series of stationary and movable blades within said casing and a by-pass connecting points along said'casing, said connection in-v cluding a nozzle diverging toward the blower outlet.

2. A turbo-blower having a casing, and a by-pass connecting pomts along said casmg, said connection including a nozzle di- 3 sage around stages of said pump,

pass connecting points along said casing, and means 1n said connection for asslstlng in the driving of the rotor of the pump.

' 4. In a multi-stage turbo-blower, the combination of a series of stages, and a return passage between the delivery of onestage and the delivery of another stage, said passage being so directed at the delivery of the preceding stage as to transform the velocity .of the fluid passing throughsaid passage into useful .work blower rotor. 5. In a multi-stage turbine pump, the combination of a series of stages, a return pasa prime adjustable to assist in driving the mover for driving said pump,

means for directly-controlling said prime mover, and means cooperating with said control means and w1th*sa1d return passage for maintaining constant the volume of'fluid 2o pumped. V

6. In a-turbo-blower, the combination of a plurality of stages, and a by-pass connecting several of said stages,'said connection in- MAX ROTTER' -Witnesses: I G, F. DE WEIN F. E. HAMELTON.