US1895564A - Gas fired revolving heater - Google Patents

Description

Jan. 31, 1933. w. D. BELL GAS FIRED REVOLVING HEATER Filed Oct. 29, 1930 2 Sheets-Sheet 1 INVENTOR WILLIAM D- BELL.

ATTORNEY Jan. 31, 1933. w. D. BELL GAS FIRED REVOLVING HEATER Filed Oct. 29, 1930 2 Sheets-Sheet 2 IN VEN TOR WILL/AM 0. BELL M 8 Q W a2 m 1 r m a w r 1 l .5? i

T i lfii n I M fi/M. l 3 a 2 2 2 r 1 H my m n W MW u a a 4 n W1WMWW{WI nfiwfiwhwwfl 1% y 6 P w M w a M J .M. 7 II A TTORNE Y Patented Jan. 31, 1933 UNITED STATES PATENT OFFICE WILLIAM D. BELL, OF COLUMBUS, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO SUB- FACE COMBUSTION CORPORATION, OF TOLEDO, OHIO, A CORPORATION OF NEW YORK GAS FIRED REVOLVING HEATER Application filed October 29, 1930. Serial No. 492,070.

This invention relates togas-fired revolving heat radiators and the invention consists, among other things, in the provision of a fan having a hollow hub constituting a combustion chamber whereinto combustible mixture is introduced for burning, the fan having hollow blades in communication with said chamber, the products of combustion passing through said blades for heating the same in order that the air passing between the blades may be heated. The various fea tures of novelty and invention will more fully appear from the detailed description taken in connection with the accompanying drawings wherein the preferred form of the in vention is shown.

Referring to the drawings:

Figure 1 is a rear elevation of the apparatus of my invention;

Figure 2 is a side elevation thereof;

Figure 3 is a section on the line 3-3 of Figure 1;

- Figure 4 is a front view of one of the blades of the fan;

Figure 5 is a top plan view of a portion of the fan looking down upon the rim showin the fan blade discharge opening;

Fig. 6 shows a modified form of driving mechanism for the fan.

In the drawings, 1 indicates a platform or base from which extends a bracket comprising a lower portion 3 and an upper portion 9 terminating in a circular flange 10. As shown in Fig. 6, a driving motor 2 may be secured to the flange 10 by bolts 11, the fan and motor shaft being indicated at 14. As shown in Fig. 2, the driving motor 2 may be supported on the base 1 in which event the fan shaft 14 will be driven by a belt 16 trained over pulleys 15 and 17 secured respectively to the fan shaft and motor shaft 18. Referring to Fig. 2, the fan shaft is supported in a bearing 13 having a circular flange 12 secured to the flange 10 by the bolts 11.

Supported by the bracket portion 3 and by arms 48 is an annular scroll or casing comprising walls 4, 5 and 6 and inwardly extending marginal rims 7 and 8 defining between them an annular passage wherethrough the fan blades project, the passage being substantially sealed b a rim late 44 secured to the fan blades. T ere is, 0 course, suflic'ient clearance space 46 to permit free rotation of the fan. The casing has a side outlet 47. The fan blades are hollow as indicated at 43, the walls of the blades being indicated at 41, 42. The hub 32 of the fan is hollow to form a combustion chamber 32. One side of the combustion chamber is partlally closed by an inwardly extending wall 33 having a central aperture 34.

Combustible mixture is introduced into the chamber 32 by a pipe 36 having a circular flange 35 surrounded by a rim 35 which projects over the edge of the hub 32 with sufficient clearance to permit free rotation of the fan. The pipe 36 is an extension of a mixing tube 36 having the usual flaring entrance 38 controlled by an air shutter 39. Gas is discharged into the tube by a gas pipe 40 terminating in a jet orifice nozzle 40'. Any suitable pilot means 37 shown as a spark plug, is provided for igniting the combustible mixture. A bracket 37 secured to the annular casing forms a support for the pipe 36 and parts associated therewith.

The other end of the combustion chamber 32 is closed by a head generally indicated at 20, the head having a rim 31 to which the hub 32 is secured and having a hub 19 secured to the drivingshaft 14 (14 in Fig. 6). The head is preferably made in two sections 23 and 24 secured by bolts 22, the walls 21 and 25 of said sections forming between them a chamber 26 shown as divided by a partition 27 which is clamped between said sections. Spaced from the wall 25 by lugs 30 is a baflie plate 29.

The primary purpose of the chamber 26 1n the head 20 is to prevent free transfer of heat from the combustion chamber 32, the baffle 29 also functioning to that end. To facilitate the abstraction of heat from the head, provision is made for passing air there through into the combustion chamber 32'. Thus the outer Wall 21 is provided with one or more apertures 27*; the partition 27 with a central aperture 27, and the inner wall with a central aperture 28., The baflie 29 deflects the air radially from the aperture 28 and, of

and is extended beyond the head and rovided with vanes 27 for assisting in the issipation of heat absorbed by the artition. It will now be readily appreciate that the air which flows through the head into the combustion chamber abstracts heat from the head and, therefore, not onl assists in keeping the head cool but the air is preheated before entering the combustion chamber thereby materially increasing the e-fiiciency of the heating unit as a whole.

The mode of operation may be briefly described as follows: The purpose of the aparatus is, of course, to heat the air passing etween the fan blades when the fan is in motion. The hot gases generated in the combustion chamber 32 flow outwardly through the hollow blades of the fan thereby heating the blades. discharge into the annular casing around the fan. The outlet 47 of the casing will be connected to an exhaust pipe for leading the gas to a suitable point of discharge.

Due to the rotation of the fan, a sub-atmospheric pressure exists in the combustion chamber 32. Due to this fact, air will be induced to enter the mixing tube 36' independently of the inducing effect of the jet of gas from the gas nozzle 40 and consequently the resulting mixture can be made to more nearly approach the proportions required to form an explosive mixture, it being understood that as long as the velocity of the mixture in the pipe 36 is in excess of the rate of flame propagation through the mixture, back flash into the mixing tube will not occur. Such additional air as may be needed to insure complete combustion of the fuel will be furnished by the air passing through the head 20 and between the closure plate 35 and hub wall 33.

Having thus fully described my inventlon, what I claim as new and desire to secure by Letters Patent, is:

1. In a revolving heater, the combination of a fan having a hollow hub forming a combustion chamber and having hollow blades in communication with said chamber, means for rotating said fan including a head forming a closure for one end of said chamber, and means for introducing at least one of the constituents of combustion through said head.

2. In a revolving heater, the combination of a fan having a hollow hub forming a combustion chamber and having hollow blades in communication with said chamber, means The waste gases from the blades for rotating said fan including a head forming a closure for one end of said chamber, and means for cooling said head including a passage for the flow of air through the head mto said chamber.

3. In a revolving heater, the combination of a fan having a hollow hub formin a combustion chamber and having hollow b ades in communication with said chamber, means for rotating said fan includin a head forming a closure for one end of sai chamber, a chamber formed in said head, and means extendmg into said last mentioned chamber for abstracting heat therefrom.

4. In a revolving heater, the combination of a fan having a hollow hub formin a combustion chamber and having hollow b mice in communication with said chamber, means for rotating said fan including a head forming a closure for one end of said chamber, a

baflle carried by and spaced from the inner side of said head, and means for introducing air between the bafile and said head.

5. In a revolving heater, the combination of a fan having a hollow hub forming a combustion chamber and having hollow blades in communication with said chamber, means for rotating said fan including a head formmg a closure for one end of said chamber, and means at the other end of said chamber for introducing combustible mixture thereinto.

6. In a revolving heater, the combination of a fan having a hollow hub forming a combustion chamber and having hollow blades in communication with said chamber, means for rotating said fan including a head formmg a closure for one end of said chamber a casing surrounding the fan for receivin the waste gases of combustion discharged irom said blades, and means at one end of said chamber for deliverin combustible mixture thereinto for burning t erein.

In testimony whereof, I aflix my si ature.

WILLIAM D. B LL.

Images