US1136861A - Heating-furnace. - Google Patents

Description

W. W. BRIERLY & T. M. SCANLON.

HEATING FURNACE.

APPLICATION FILED FEB. e. 1913.

Patented Apr. 20, 1915.

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WILLIAM W. BRIERLY AND THOMAS M. SCANLON, OF IVIILLBURY, MASSACHUSETTS, ASSIGNOBS T0 MILLBURY STEEL FOUNDRY COMPANY, OF MILLBURY, MASSACHU- SETTS, A CORPORATION OF MASSACHUSETTS.

HEATING-FURNACE.

Specification of Letters Patent.

Patented Apr. 20, 1915.

Application filed February 6, 1913. Serial N 0. 746,468.

To all whom it may concern Be it known that we, WVILLIAM W. BRI- ERLY and THOMAS M. SGANLON, both citizens of the United States, residing at Millbury, in the county of Worcester and Commonwealth of Massachusetts, have invented new and useful Improvements in Heating- Furnaces, of which the following is a specification, accompanied by drawings forming a part of the same.

Our present invention relates to that type of heating furnaces which has a heating chamber connected at one end with a stack or chimney and provided with means for the application of heat at the opposite end, such furnaces, for-example, as are used for melting metal in crucibles and other purposes.

The objects of'our invention are to provide a more thorough combustion of the fuel and to accomplish a more uniform distribution of heat through the heating cha1nber. 1

These objects, among others, are accomplished by the construction and arrangement of parts as hereinafter described, the novel features being pointed out in the annexed claims.

Referring to the accompanying drawings, Flgure 1 represents a plan view of a heating furnace of the class'to which our inven- 7 tion relates and adapted to be heated by gaseous or liquid fuel applied in the form of jets to one end of the furnace. Fig. 2 is a side elevation of the furnace showing the apparatus for controlling the supply of liquid fuel. Fig. 3 is a detached view, partly in section, of a Bunsen burner which may be of any well known form of construction adapted for the purpose. Fig. 41 is a transverse sectional view through the heating chamber on the plane of the broken line 44, Fig. 1, and Fig. 5 is a transverse sectional View through the heating chamber on the plane of the broken line 55, Fig. 1.

Similar reference characters refer to similar parts in the different figures.

Referring to the drawings, 1 denotes the body portion of the furnace, usually constructed of brick or suitable fireproof material and inclosing a heating chamber 2, that represented in the accompanying drawings' being adapted for the melting of metal in pots or crucibles represented by the broken lines 3. One end of the heating" chamber is provided with a central opening 4 leading to a stack or chimney, not shown. The side walls 5 of the heating chamber, 1n the present instance, are parallel, and between the parallel walls 5 and the central opening 4: the walls are arranged at an obllque angle to the axis of the heating chamber, as represented at 6, 6, Fig. l.

The opposite end of the heating chamber is open and communicates with an auxiliary chamber 7, in the present instance, of the same width as the heating chamber, but having an arched roof 8, Fig. 4, substantially semicircular, with the arched sides springing from the bottom 9 of the auxiliary chamber. This auxiliary chamber 7, which is herein termed a mixing chamber, is provided at the end opposite the heating chamber 2 with a narrow opening 10.

In front of the opening 10, and in the same horizontal plane, we arrange two Bunsen burners of any known type of construction, such, for example, as that represented partly in sectional view in Fig. 3, and consisting of a supply pipe 11 connected with a source of liquid fuel supply.

The free end of the fuel supply pipe 11 has a restricted o ening 12 and is inclosed by a sleeve 13 providing an annular space 1% between the supply pipe 11 and the sleeve.

The annular space 14 is closed at one end by a plug 15 and the sleeve 13 is provided at its opposite end with a cap 16 having a central opening 17 opposite the opening 12 of the supply pipe. Air is admitted to the annular chamber 14 through an air supply pipe 18.

The fuel supply pipe 11 is provided with a valve 19 by which the supply of fuel to the burner is controlled. As the Bunsen burners are duplicates of each other, a description of one will sufiice.

The fuel supply pipes 11 are connected with scrubbers 20 and each of the scrubbers 20 is connected with a common feed pipe 21 leading to a centrifugal pump 22 operated from any convenient source of power by means of a belt pulley 23. The pump 22 is piped to a cylindrical heater 21 extending transversely across, and resting upon, the front end of the furnace. The heater 21 is connected by a pipe 25 with a reservoir for and the pump 22 is connected with the pipe 21 by a short pipe 27 forming a bypass and having its passage controlled by a valve 28. By adjusting the valve 28, the pressure of the liquid fuel delivered to the Bunsen burners by the pump 22 may be varied. When the valve 28 is opened, the flow of oil to the pump is supplied chiefly through the pipe 21 leading from the pump, thereby reducing the flow of oil to the Bunsen burners. hen the valve 28 is closed, the entire amount of oil forced forward by the pump 22 is carried to theburners. The air pipes 18, 18 connected with the Bunsen burners are supplied through a common pipe 29 by air which is forced through the pipes by means of a pressure blower, or other suitable means for producing a powerful current of air through the burners.

The jet of liquid fuel passing through the contracted opening 12 in the burner is mingled with the air current, being forced through the opening 17 in the form of a spray which, when ignited, supplies fuel to two powerful jets of flame which are forced through the opening 10 into the mixing chamber 7 Each of the Bunsen burners, located as shown at A and B, is placed at an oblique angle to the other and to the axis of the heating chamber so that the jets of flame are forced in the direction indicated by the spaces 30, 31 included between broken lines. are located in the same horizontal plane, the path of each of the jets 30 and 31 crosses the path of the other jet near the opening 10 and at the entrance to the mixing chamber 7. The force of the two jets is thereby partially reduced by their meeting. The Bunsen burners A and B are also arranged so that the jets proceeding from each of the burners, if uninterrupted, would reach across and strike the arched roof of the mixing chamber.

. The arched roof of the mixing chamber, against which the flame impinges, acts as a baffle-plate to distribute the jet and cause it to inter-mingle with the surrounding air in the mixing chamber.

The forcible movement of the jets 30 and 31 through the contracted opening 10 induces an inward current of air from the outside into the mixing chamber which mingles with the jets at their point of intersection, furnishing an additional supply of oxygen to support the combustion of the liquid fuel. As this supply of oxygen is furnished at the point where the jets are shattered by their contact with each other, the admixture of air is rendered more complete and efficient. By partially shattering the two jets where they cross each other near the opening 10 and by causing the jets to impinge against the arched roof of the mixing chamber, the

As the two Bunsen burners A and B it reaches the first crucible in the heating chamber, causing the heat to 'pass'with a uniform movement through all parts of the heating chamber creating a substantially uniform temperature around each of the crucibles so that the melting of the metals contained in the crucible takes place with equal rapidity in all parts of the heating chamber; The oblique walls 6, 6 at the rear of the heating chamber, in deflecting the current of heated air, causes it to pass be-- hind and around the farthermost crucibles in the heating chamber so that the heat supplied thereto is substantially the same as that supplied to the crucibles at the opposite or entrance end of the. chamber.

By means of our improvement the forcible contact of the flame jets 80 and 31 is received by the arched roof of the mixing chamber which, when properly constructed, is able to withstand the excessive heat and force of the current created by said jets. The latter are thereby prevented from impinging against the first row of crucibles which would tend to shorten their life, even if it did not destroy them at a single heat: ing. 7

The mixing chamber and the particular arrangement of the Bunsen burners with reference to the heating chamber, which is a characteristicof our invention, accomplishes two important results, namely, a better mixture of oxygen with the liquid fuel and a reduction in the force of the jets before they reach the heating, chamber, causing the movement of heated air to pass uniformly through, the heating chamber by the induced current through the opening 4 caused by r the stack or chimney.

In order to draw the current of heated air through the heating chamber and preserve a uniform heating between the upper and lower portions of the chamber, we make the central opening 4 considerably shorter than the height of the mixing chamber in order to cause the heated air at the top of the V chamber to pass downward through the 7 ing in its end wall remote from said heating chamber, and means for directing converge ring jets of flame through said opening,

whereby a current of atmospheric air is induced therethrough.

2. In a/heating furnace of the kind described, a heating chamber, a second chamber in longitudinal alinement with said heating chamber having a transversely arched roof, and an opening in its end wall remote chamber in communication therewith having an arched roof, and an opening in its end remote from said heatlng chamber, means exterior to said combustion chamber for directing jets of flame through said opening against the sides of said arched roof, whereby a current of atmospheric air is induced through said opening into said 15 combustion chamber.

Dated this 1st day of February 1913.

WILLIAM W. BRIERLY. THOMAS M. SCANLON. Witnesses:

ULLA A. SWENSON, ELEANOR HUNT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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