US1244863A - Blast-heater. - Google Patents

Description

W. W. KEMP & W.-H. VAN HOHN BLAST HEATER.

- APPLICATION FILED JUNE 23. 1916.

1,244,863., Patented 001;. 30, 1917].

srairns PATENT OFFICE.

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BLAST-HEATER.

Laeaees.

Application filed June 23, 1916. Serial No. 105,526.

To all whom it my concern:

Beit known that we, WILLIAM Wanmcn KEMP and WILLIAM H. VAN HORN, citizens of the United States, residing atBaltimore,

in the county of Baltimore City and State of Maryland, have invented new and useful Improvements in Blast-Heaters, of which the following is a specification.

This invention relates to heaters, and has as its object to provide a heater in which a blast flame is utilized to create and maintain the circulation of a heated. gaseous-medium through an endless passage, the heated medium being repeatedly returned to the flame or blast to be heated thereby. By

. thus returning the gaseous medium or prodnets of combustion and repeatedly heating them, a great economy in the consumption of fuel is obtained, for after passing through the endless passage, the combustion products still possess considerable heat, and less fuel is required to heat them to the desired temperature than if fresh atmospheric air were used. The heated gases or products.

of combustion circulate rapidly through the radiator, the heat distribution is uniform and the temperature of the device may be easily and perfectly controlled, while, at the same time, the discharge of the products of combustion and dust into the chamber to be heated may be avoided.

The above and other objects of this invention are obtained by' the structure described in the following specification and. illustrated in the accompanying drawings, and where- Figure 1 is an elevational view of our device, a portion of the heater being broken away to disclose the burner.

Fig. 2 is a view similar to Fig. 1, showing a slightly different construction.

, In the drawings, like numerals represent like parts in the several views. We have shown, in the present instance, our improved heater as comprising a radiator but, of course, our apparatus is susceptible to various changes, and the method of heating herein described may be carried out in appa ratus other than radiators .10 designates a radiating pipe which is endless in that it forms a continuous passage through which the heated products of combustion are adapted tocirculate. The radiating pipe may be of any suitable construction, and may be constructed of wrought iron or any other suitable material. In the present instance,

Specification of Letters Patent.

Patented Oct. 30,- 1917.

' we have shown-the pipe as laid out to form -or tortuous path of any suitable shape depending on the use to which it is to be put.

Mounted within the radiating pipe is a burner tube 11 retained centrally within the pipe by means of brackets or spiders 12. The burner tube 11 is mounted preferably at one of the angles or elbows of the radiating pipe with its inner end extending longitudinally into the inlet portion 13 of the radiating pipe and its outer end projecting into the elbow, the latter end being in alinemeut with the through opening in the return portion 14 of the radiating pipe. Extending through an openin 15 in the wall of the radiating pipe, an in alinement' with the tube 11 is a gas pipe 16 carrying on its inner end a burner '17 which may be of any suitable construction. The pipe 16 leads from a suitable air and gas mixing device, and while any such suitable device may be employed,

we prefer to connect the pipe 16 to a gas and air mixing apparatus of the general type disclosed in Patent No. 1,141,466, dated June 1, 1915, granted to W. H. Van Horn and Wm. W. Kemp. In the device described in the last-mentioned patent, air and gas are mixed in such proportions, that the mixture is self-sustaining; that is, sufiicient oxygen is in the mixture to completely burn the gas mixed therewith and no outside supporter of combustion is required. The pipe 16 has a regulating and shut-off cock 17' which may be ofany desired form, and which has an operating handle 18 provided with a.pointer 19 which is adapted to move over an indirating scale upon the plate or member 20 when the handle is turned. 7

In Fig. 2, we have shown a device similar to that disclosed in Fig. 1,'but in this embodiment of the invention the radiator is disclosed as mounted horizontally (although it may be mounted vertically) in a japanning oven, the japanning oven being conventionally shown by the line 21. It is, of course, obvious that the device herein disclosed is applicable for use in a great variety of apparatus, and we have shown the same applied in Fig. 2 to a japanning oven by way of illustration only. In such oven, it is particularly desirable to eliminate introduction of products of combustion or dust into the space in which the articles to be japanned are located, to obtain a relaing pipe and its in ct end lies within tively high heat and to heat the oven uni formly, and with the use of our device, these requisites are obtained. In this embodiment, the radiator is shown as provided with a neck portion 22 extending through an opening in the wall of the japanning oven and having a chamber 23 with which the ends of the radiating pipe 10 are in communication, and by this construction, the exhaust gases may be discharged through the opening 15 about the pipe 16 into the atmosphere and thus introduction of these exhaust gases into the oven is eliminated. The tube 11 is so mounted that its outlet'end lies ithin the inlet ortion 13 of the radiatiot e chamber 23.

When it is desired to place the device disclosed in the drawings in operation, the handle 18 is turned (the amount to which it is turned being indicated by the position of the pointer over the scale), to admit the air and gas mixture from its source (not shown) to the burner where it is ignited. The mixture of air and gas produces a flame which is self-sustaining, and the mixture is projected into the tube 11 with considerable pressure, thereby causing the products of combustion to travel through the tube 11 with considerable velocity. A strong suction is thus created about the burner which draws or entrains atmospheric air into the tube 11 and about the burner. The prod ucts'of combustion together with the entrained air are discharged from the outlet end of the tube 11 into the pipe 10 and the same circulate through the pipe 10 with considerable rapidity. Immediately after starting the burner, an influx of air through the opening 15 is noticeable, and then for a short period of time a noticeable exit of air through the opening-15 may be observed,

' this exit of air being due to the fact that the products of combustion from the burner forces or scavenges the pipe of the air with which the same is filled when not in operation. After. the device is in operation a short time, the products of combustion are repeatedly circulated through the radiating pipe, a portion of the products of combust1on after passing through the return portion 14 of pipe 10 being entrained or drawn into the pipe 11 about the burner 17 and a secondary suction being created in the space between the tube 11 and the surrounding wall of the radiating pipe 10 duetothe blast discharge of the products of combustion from the outlet end of tube 11. During the normal operation of the device, a discharge of the excess combustion products through the opening 15 takes place, this being due, of course, to the fact that a gaseous mixture is continuously admitted into the-heater .through the burner 17.

It will be noted that during the normal I a i L operation of the devlce, an or other gas 1s r not admitted to the radiator except through the burner 17, the gaseous mixture admitted to the burner being in such proportion that the flame is self-supporting. The discharge of combustion products from the burner is such as to force the gaseous medium within the pipe 10 before them, and, at the same time, a suction action is created about the burner and about the tube 11 which draws the gaseous products of combustion passing through the return portion 14 into the inlet portion 13 of the radiator. These gases are again and again circulated through the radiating pipe and the circulation throughout the entire length of the radiating p1pe is very rapid so that the heat is uniformly distributed. In place of discharging the products of combustion from the pipe after completing the circuit and drawing'in fresh air, the products of combustion are again heated by the hot blast from the burner and as the combustion products retain some of their heat, itrequires less fuel to heat them to any given degree than if outside air were utilized.

When the radiator is applied to a japanning or other oven, the neck portion 22 preferably extends through an opening in the wall of the oven so that excess products of combustion discharged from the radiator pass oif into the atmosphere and none of the products of combustion enter. into-the compartment in which the articles are treated, and thus dust and the like due to the burning of fuel, or dust which might be introduced dueto draft currents or stirred up thereby are entirely eliminated. It is, 4

. clalms.

What. is claimed is: p v

1. In combination, a member having an endless substantially closed passage from which air is excluded and provided with an opening for {exhaust purposes only, and means for discharging a flame forwardly into said passage at a pressure greater than that of the atmosphere for reheating and causing circulation of the products of combustion therein. J

2.-In combination, a member having an endless substantially closed passage having an exit opening, and means for discharging an ignited flame sustainin mixture 4 at a pressure greater than that o the atmosphere into said passage and in a direction therein to cause the products oii combustion to flow about said passage.

5. A radiator comprisingan endlessfpipe 3. In; combination, an endless tube hav ing a, continuous substantially closed pas sage provided withan exit opening for ex* haust purposes only, and means within the passage for discharging an ignited aseous flame-sustaining mixture therein un er relatively high pressure in a direction to cause the products of combustion to flow about the passage at relatively high velocity.

4. A radiator comprising a pipe having a substantially closed. endless passage from which air is excluded and provided with an opening for exhaust purposes only, and

means for discharging a hot flame under pressure greater than atmospheric into saidpassage in a direction, to cause the products of combustion to circulate about the passage.

having a continuous substantially blosed passage, means, within the passage for dis- "fcharging an ignited gaseous flame-sustaining mixture under relatively high pressure therein'in a direction to cause the productionsof combustion to-oirculate about said passage, said pipe having at its return side of combustion discharge.

6. A radiator comprising an endless radiating pipe having a continuous. passage an opening through which excess products from which air is excluded and provided with an opening for exhaust purposes only,

I endless substantially closed passage romdirection to cause efirculation of the and a'bua'ner within the passage adapted to discharge an ignited. gaseous flame-sustaining mixture under pressure forwardly therein to create a circulation ofthe products of combustion andrepeatedly heat them.

'7. In combination, a member havin 'an which air is excluded, a tube in said passage spaced from the wall thereof, and means for discharging a flame into the tube under pressure greater than atmospheric and ina products of combustion rough the passage, and

an outlet in said passage for permitting dis charge of the products of combustion.

8. In combination, a member having an endless substantially closed passage, a tube 4 within and lengthwise'of the passage and speced from the wall thereof, and a burner extending into said tube for discharging an ignited gaseous flame-sustaining mixture into said tube under pressure greater than atmospheric and in 'a direction to entrain products of combustion into the tube and into the space aboutfthe tube, said passage 1 means for dischargin poses at its return side. 10. A radiator comprising an endless pipe of heat conducting material having acontinuous passage from which air is excluded and also having an opening for exhaust purposes only; a tube within the passage spaced from the wall thereof, and a burner extending into the tube and adapted to discharge an ignited gaseous flame-sustaining mixture underpressure forwardly therein to entrain products of combustion into the tube and in the space between the tube and the wall of the pipe and thus create a circulation of the products o'f combustionv therein at relatively high velocity so that they are repeatedly heat-ed.

' 11. In combination, a chamber, an endless substantially closed pipe within the chamber having a continuous passage from which air is excluded, said passage having an outletv opening for exhaust purposes only, and means within the passage for discharging an ignited gaseous flame-sustaining mixture under pressure greater than atmospheric into the passage in a direction to cause the.

products of combustion to flowthrough the passage.

12. In combination, a chamber, an oven, a pipe having an endless substantially closed passage from which air is excluded, said passage having an outlet opening for exhaust purposes only in the return .side of the pipe and outside of said chamber, and

a gaseous flame sustaining mixture into t e passage under pressure greater than atmospheric and in a direction to cause circulation of the products of combustion about the passage.

In testimony whereof we have set our hands'in presence of two subscribing witnesses. 1

WILLIAM WALLACE KEMP.

. WHJLIAM H. VAN HORN.

Witnesses:

' H. G. Bisnor,

MARY URsI hereunto

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