US1959106A

US1959106A - Reversible flow gas propelling device

Info

Publication number: US1959106A
Application number: US611659A
Authority: US
Inventors: Hjaimar S Mcssing
Original assignee: AO Smith Corp
Current assignee: AO Smith Corp
Priority date: 1932-05-16
Filing date: 1932-05-16
Publication date: 1934-05-15
Anticipated expiration: 1951-05-15

Description

May 15, 1934. H. s. MESSING REVERSIBLE FLOW GAS PROPELLING DEVICE Filed May 16, 1952 2 sheets-sheet .1

Fins.

INVENTOR. /j'cllmdr $.Mess1'ng B n @m fm,

ATTORNEY.

May l5, 1934.

H. s. MESSING 1,959,106 REVERSIBLE'FLOW GAS PROPELLING DEVICE Filed May 16, 1932 2 Sheets-Sheet 2 INVENTOR. Hjczlmar S. Messing -ATTORNEY.

; Patented May" 1934 v aavsasrnmnowessraormmo nevica 1 Messing, Milwaukee, Wis., assigner to wila y. corporation o fNew'Yo Application my is, 193s. semi No. custo s claim. (ocaso-42) The invention. relates to'gas propelling devices and especially to devices for reversing the now of gas as well as for propelling the gas.-

It is among the objects of the4 invention to 5 provide blowing devices which will operate to force gas in to one part of 9T gas system and withdraw the gas from anotherA part of the'system.

Another object of the 'invention is to provide for of the kind, it will be described with reference to metallurgical furnaces such as open hearth furnaces which are operated witha forced draft .of heated air.

Accordingly, the reversible blower comprises a plurality of gas driving units, such as blowers or propellers, mounted to be turned on a shaft. The blowers are adapted to be shifted axially ofthe mounting to bring them in cooperative relation with inlets and outlets end one -or'the other of them in'cooperative. relationwith a suitably disposed stack. Disk partitions orvalve' members are mounted` to turn with the blowers and are disposed on the mounting at the ends and between the blowers so that in one position, one blower and the valve memberswill ibe broughtV into a feeding position with respect to a supply conduit and a delivery pipe,and theother will be brought into a discharging position with respect to an- 'other supply conduit and the stack. Upon a predetermined axial displacement of the blowers and Avalves onl the mounting, they are brought into .discharging andfeeding positions respectively with respect to the same conduits and the blow of gas becomes reversed thereby. f

lirithe drawings constituting a part hereof,

Fig. l is a plan view of la reversing blower with parts of the casing broken away, 5o Fig. 2 is a similar view of the device shown in 1 Fig. l with the blower and valve members shifted for reversing the flow/of gas, e

. Fig. 3 is` a plan view of a blower broken away showing a modification of the. device 'shown in Fig.1,

can be embodided in devices for various liurboses' with partei Fig. 41s asimilar view of the device shownI inf Fig. 3 with the blower and valve members shifted for reversing the ow of gas, and

1 Fimo is a diagrammatic representation of a regenerative furnace showing the arrangement thereof in accord ce with the present invention. 4

Referring 'to the drawings, a blower casing 1 is providedwith

delivery pipes

2 and 3 which are connected to

regenerators

4 and 5 which may 65 be constructed in accordancev with well known design."y .The regenerators are vconnected through conduits 6 and 'I to the opposite ends of an open hearth furnace 8. Fuel nozzles' 9 are disposed at the, ends of the furnace to inject fuel into the heated air .which enters the furnace through the -conduit or 'l as the case may be. When'the direction of the gas flow is such that the' conduit 6 or 7:' constitutes a conductor for discharged gas, the corresponding fuel injector isclosed. t The propellers l0 and disks or barriers 11 and l l'-are mountedon a shaft 12 which is splined or squared. at one lencl 13` to provide a sliding fit in a complementary connection member Vv11.1. on the motor shaft 15 ofthe driving motor 16. Clears ance isjprovided in the connection '14 at the end ofthe shaft to permit .the-necessary axial disvplacement of the shaft l2. Y 'Theshaft lzismountedinthebo gs 20 and `2l in the ends of the casing l `and t e other end -85' y of the shaft is extended through the casing' suiciently to permit the necessary `displacement of the blowers. ..The" end of the shaft is connected through a thrust bearing 22 with a control device lwhich axiallyactuates the shaft and blowers to give them the desired displacement for effecting a reversal of the flow of gas.

The thrust control consists of a cylinder 25 with

pipes

26 and 27`connected through acontrol' vvalve 28 and a pipe 29 t'o a source of air,under pressure. A piston 3l is mounted in the cylinder 25, and the piston rod 32, which extends through the packing 33, is attached to the thrust bearing 22 so that the piston rod 32 may thrust the shaft t 12 axially without turning the piston and rod 32. "100.

The valve 28 is suitably provided with'pass'ages so that in one position of the valve, one side of the piston 31 will-be connected with the'pressure source and the other side will be connected with the atmosphere through the exhaust pipev 34 to 105 thrust the piston and shaft to one side. -The shaft ls actuated into its opposite extreme position by turning the valve 28 so as to 'connect the'other side of the piston to the pressure source and the space in back of thepiston to the exhaust pipe 34. no

, The propellers 10 are spaced apart on the shaft 12. The propellers are biased to draw the gas from opposite directions when they are rotated in the same direction- The arrangement shown in v5 the drawings is for propelling the gas streamstonecessarily, given a spiral or curved surface to offer the least resistance to the flow of the gas. End barriers 11 are spaced from the propellers and mounted in the casing similarly to barrier 17. These barriers may desirably have curved inner surfaces shaped to offer minimum resistance to the ow of gas. The outer surfaces of the barriers 11 are desirably planed to conform to the end walls of the casing when they are in extreme end positions to avoid circulation of air at the ends of the casing near the bearings. The barriers and propellers may desirably be spaced equally but other spacing can be used by making corresponding changes in the outlets in the casing. A

With thepropellers and barriers in an extreme end position, such as the extreme right endV position shown in Fig. 1, the delivery pipe 2 from the furnace is disposed to open into the casing between the left barrier 11 and the left propeller 10, and the pipe 50 to the stack 51 opens into the casing between the propeller 10 and the intermediate barrier 17 so that by turning the shaft in the direction indicated by the arrow in Fig. 1,

the gas will be drawn from the furnace through the pipe 2 and propelled through the casing 1 and stack pipe 50 into the stack 51. In this position of the propellers, the air supply conduit 55 is disposed 'tol open into the casing in the clearance space at the left end of the casing as shown in Fig. 1 and so that there will be a substantial clearance between the opening into the casing and the left end barrier 11. The delivery pipe 3 is disposed to open into casing 1 so that the peripheral edge of the intermediate barrier 17 will overlap thecasing and constitute a barrier between the gas discharge space 52 and the space 53.

The propeller l10 in the feed gas space 53 is biased to take air from the feed conduit 54 and discharge it into the delivery pipe 3 when it is rotated in the described direction. The fresh air conduit 54 is disposed to open into the casing -to the right of propeller 1Q a distance such that the iight end barrier 11 will be disposed alittle to the left of the opening when it is moved into its opposite end position as shown in Fig. 2. In the position shown in Fig. 1, it will be observed that the gas pressure in the fresh air space 53 will tend to be slightly higher than the pressure in the exhaust gas space 52. Consequently, the gas which may leak aroundthe peripheral edges of the barriers 11 and 17 tend to pass into the exhaust gas, and the airwhich is propelled into pipe 3 will not be'vitiated with exhaust gas. Furthermore, the cool air entering through conduit 54 and around the end bearing will cool the end barrier and the bearing. The bearing on the opposite end will be cooled by cool air which tends to be drawn therearound.

In the oppositeA end position of the propellers as shown in Fig. 2, the right end barrier 11 is disposed to close communication 'between the air conduit 54 and the pipe 3. The intermediate barrier 17 is disposed to open communication between pipe 3 and stack 51, and to close communication between pipe 2 and stack 51. The left end barrier 11 will have been moved into an extreme left end position in which communication is established between air conduit 55 and the pipe 2. The above described direction of rotation of the propellers causes air to flow from conduit 55 through the space 56 into the supply pipe 2 which leads to the regenerators or the furnace, as the case may be. The air conduit 54 is disconnected treme to the other extreme position, the direc.

tion of flow is reversed without changing the direction of rotation of the propellers.

l The quantity of air delivered by the blowers may be regulated by a cut-olf, such as the butterfly valves 58 in the

air conduits

54 and 55.

Gas systems which provide regenerators between the blower and the furnace require a delivery of more' or less highly heated gas to the blower. In the described arrangement the propellers alternately handle hot and cold gases so that they are alternately heated and cooled and the average temperature of these parts is automatically maintained below the temperature of are made in the form of spirals. The spiral ducts 62 and 63 lead to the pipes 2 and-3 respectively and spiral duct 64 leads to the stack 51. The intermediate barrier carries the vanes 60 and plates 65 which plates are mounted on the outside ends of the vanes. The plates 65 have central openings which provide intake ports for the runners and outer peripheral anges whichare spaced with a small clearance from the wall of the casing to provide the inner wall of the duct around the runner. The end barriers 11 may be flat disks as shown in Fig. 3 but the inner surfaces of the barriers may desirably be formed to avoid turbulence Iin the gas as shown in Fig. 1. In. operation, the runners and barriers are shifted axially to reverse the ow of gas in-the same manner as the propellers and barriers shown in Fig. 1. It will be observed that the modification shown in Fig. 3 provides a compact'structure which may be assembled in a small space.

Although the invention has been described with v ternately with respect to the conduits and stack openings, a shaft carrying blowers, one of said blowers being disposed in the casing for taking gas from one of said conduits and delivering it to one of said pipes, the other blower being operable to take gas from the other pipe and deliver it to the stack, and means coacting with said blowers for closing the communication between the other of said conduits and a blower.

2. A gas propelling device which comprises a blower casing, supply conduits opening into the casing, a stack connection disposed to open into the enclosure of the casing between thel conduits, delivery pipes disposed to open into the casing alternately with respect to the conduit and stack openings, a shaft carrying blowers, one ofWsaid blowers being disposed in the casing for taking gas from one of said conduits and delivering it to one of said pipes, the other blower being operable to take gas from the other pipe and deliver it to the stack, means coacting with said blowers for closing the communication between the other of said conduits and a blower, and means for shifting said blowers with respect to said openings to reverse the flow of gas in said pipes and establish communication between a blower and said other conduit.

3. A gas propelling device which comprises a casing, supply conduits opening into the casing, a stack connection disposed to open into the casing between the conduits, delivery pipes along the casing arranged to open thereinto alternately with respect to the conduit and stack openings, a plurality of gas propellers, a longitudinally disposed driving shaft for rotatably mounting the propellers, and means to shift the propellers axially of the shaft across the openings of the delivery pipes to reverse the flow of gas in said pipes and maintain communication to the stack from one of said pipes. I

4. A gas propelling device which comprises a casing having supply conduits opening into the casing, a stack connection disposed to open into the casing between the conduits, delivery pipes along the casing arranged to open thereinto alternately with respect to the conduit and stack openings, a longitudinally disposed driving shaft `rotatably mounted in the casing, opposed propel- 1ers spaced on the shaft so as to dispose one propeller between a conduit and a delivery pipe and to dispose another propeller between another delivery pipe and a stack, barriers disposed on both sides of the propellers to prevent communication ,between said conduits and stack, and means for shifting the propellers and barriers axially of the shaft to dispose them on diametrically opposite sides of said openings.

5. A gas propelling device which comprises a casing having supply conduits opening into the casing, a stack connection disposed to open into the casing between the conduits, delivery pipes along the casing arranged to open thereinto alternately withrespect to the conduit and stack openings, a longitudinally disposed driving shaft rotatably mounted in the casing, a plurality of gas driving means spaced on the shaft so as to dispose one ofsaid means between a conduit and a delivery pipe and another of said means between another delivery pipe and a. stack, barriers carried on both sides of said driving means and integrally operable therewith to .close communication between said conduits and stack, and means to shift the gas driving means and barriers transversely across the openings.

6. A gas propelling device which comprises a casing having supply conduits opening into the casing, a stack connection disposed to open into the casing between the conduits, gas delivery pipes along the casing arranged to open thereinto alternately with respect to the conduits and stack, a longitudinally disposed driving shaft rotatably mounted in the casing, means for axially displacing theshaft and retaining the same in predetermined displaced positions, driving means for rotating the shaft, a plurality of propellers mounted to turn with the shaft and biased to induce gas flow in opposite directions, one of said propellers being disposed between a conduit and a delivery pipe and another being disposed between another delivery pipe and a stack when the shaft is displaced into one of said predetermined positions, and barriers on both sides of the propellers integrally shiftable there-` with to close communication between said conduits and stack, said axial displacement being arranged to shift the propellers to the opposite sides of said delivery pipes and gas conduits.

7. A gas propelling device which comprises a casing having supply conduits opening into the casing, a stack connection disposed to open into the casing between the conduits, gas delivery pipes along the casing arranged to open thereinto alternately with` respect to the conduits and stack, a longitudinally disposed driving shaft rotatably mounted in the casing to shift to predetermined end positions, an intermediate barrier mounted to turn with the shaft and form a sealing means with the casing to alternately close communication between the stack and a pipe as it is shifted to end positions and to open communication with the other pipe, centrifugal blowers including vanes mounted on opposite sides of the intermediate barrier and partitions having central supply ports on the outside ends of the vanes to drive the gas and confine the flow thereof, end barriers on the shaft spaced from the blowers'to alternately open communication with said pipe and a conduit and close communication with said other pipe and another conduit when the blowers are shifted to end positions, means to rotate the shaft, and means to shift the blowers and barriers axially.

8. A gaspropelling device which comprises a casing having supply conduits opening into the casing, a stack connection disposed to open into the casing between the conduits, gas delivery pipes along the casing arranged to open thereinto alternately with respect to the conduits and stack, a longitudinally disposed driving shaft rotatably mounted in the casing to shift to predetermined end positions, means carried by the shaft to drive i air from a conduit into a supply pipe when the shaft is in one of said positions and from another conduit to another pipe when the shaft is in the other end position, means for rotating the shaft, and means for shifting the shaft and said driving means into said end positions.

HJALMAR S. MESSING.