US1849037A - Combustion chamber for leers - Google Patents

Description

March 1932. w. T. HoN'ss COMBUSTION ..CHAMBER FOR LEERS Filed Oct. 22, 1929 AI l L ,[04 ,lo 41/14 (411 1 1 A Inceno Wt'ZZiamTHo niss yflm %4 Ao rneys Patented Mar. 8, 1932 UNITED STATES PATENT OFFICE WILLIAM T. HONISS, OF 'WEST HABTFORD, CONR'E'I. `I(7U"II.', ASSIGNOB TO HABIFORD- EMPIBE COMPANY, OF EARTFORD, CONNECTICUT, A OOBPORATION OF DELAWABE COMBUSTION CHAMBER FOR LEEBS eApplication filed October 22, 1929. Serial Ne. 401.406.

This invention relates to fireboxes for glass annealing leers of the combustion type, and more particularly to a directional control of the air admitted to the box for the purpose of diluting the products of combustion.

In a leer of the type shown and described in Patent No. 1,560,481, granted Nov. 3, 1925, to Vergil Mulholland, a portion of which is more or less diagrammatically indicated in Fig. 1 of this application, heat is applied to the ware passing through the tunnel by passing gas'es of combustion, which have received a preliminar cooling in the firebox, through a series of ues running side by side longitudinally of the tunnel and bneath the ware. As is well known in the a'rt, it is highly desirablethat the temperature of the leer tunnel, and hence of the Ware, be maintained uniform throughout any given cross-section of the leer. Under certain conditions, there is a tendency toward the Creation of hotter or cooler spots in other portions of the cross section of the tunnel. It is therefore highly desirable to provide the leer' with means whereby the heatingefl'ect of gases passing beneath the ware in different portions laterally of the tunnel may be separately controlled and varied to the end t hat the ultimate condition in the tunnel may be uniform throughout each cross section. To this end,

the leer described in the aforesaid patent is provided with suitable means for controlling the distribution of hot gases transversely of the flues. i

The present invention is an improvement upon and addition to the leer of the aforesaid patent in that it provides a control of the currents of gases prior to their arrival at the entrance to the flues or' to the aforesaid distributin means which aid in the control of the distribution of the hot gases transversely of the flues. As in the aforesaid Mulholland patent, the heating gases are generated n one chamber of a firebox, from whence the products of combustion pass, to a second or dilution chambcr in which they are mixed with atmospheric air, whereby they are brought to a temperature such that when they: reach the beginnings of the flues, they will be at approximately the temperature at which the glassware is to be held 'for the release of permanent strains. In the present invention, as in the Mulholland patent aforesaid, the products of combustion passing from the combustion chamber move over an opening in the bottom of the mixing chamber through which the diluting air is delivered into the chamber, and these gases, as they mix, pass around bafles and into the mixing chamberfrom whence they pass through suitable passages to the flues. The opening for the diluting air aforementioned communicates in the Mulholland leer, as in the present case, with a passage running transversely of the leer to an'opening at one side of the leer to theatmosphere.

It has been found that with such an arrangement, there is a tendency at times for the products of combustion entering the mixing chamber and the diluting-air to pass around the sides of the baflleunequally creating a current which tends to sweep across the ends of flues, and which therefore pre- -sents the gases to the flues and distributing means in an improper manner. This undesrable result s caused in part by the manner in which the burner is pointed and even very slight irregularities in the Construction of the combustion chamber and of the baflies. Even in a leer provided with the distributing means as shown in Patent 1,560,481, there are occasions upon which the control is upset by the presence of these unequal Currents.

An object of my invention, therefore, is to provide means whereby I may optionally control the direction in which the relatively cool air enters the mixing chamber and thus con-' trol the direction of curents of gases around the battle to the end that desired temperatures conditions in the flues may be maintained.

In the drawings,

'Fig. 1 is a vertical longitudinal section of the forward 01' receiving end of a leer, embodying my invention;

Fig. 2 is a horizontal sectional view illustrating the internal construction of the heating apparatus 'for a leer, and showing the 10- cation of the vanes used for controlling a, direction of the air entering the mixing chamber, the section being taken on the line 2-2 of Fig. 1;

Fig. 3 is a vertical transverse sectional View taken'on the lines 3-3 of Fig. 2; and

Fig. 4 is an isometric View in section of the flues for heating the leer, taken on the lines H of Fig. 1.

The present invention is an improvemen on the leer disclosed in the above mentioned Patent 1,560,481, and comprises, asshown in Fig. 1, a tunnel A, a plurality of heating flues thereunder, generally designated as C, and a firebox B which communicates With the heating flues.

The leer is heated by a burner 5 which projects a flame through an opening 6 into a combustion chamber 7 provided in the firebox B; The flame from the burner, upon entering the chamber 7, first impinges upon an angularly disposed bafiie 8 which deflects it away from thevopenin 9. In the combustion chamber 7, the prodhcts of combustion pass through the opening 9 provided in a wall 10 into a mixing chamber 11, 'where they 'first encounter a baflle 12, which deflects them rearwardly and distributes them in a lateral direction throughout the chamber( A port 13 establishes communication between the outer atmosphere and the chamber 11, directly to the rear of the baflie 12, and supplies air to the products of combustion as they enter the chamber 11. The amount of air passing through the port 13 may be controlled by a damper 14 provided on the side of the firebox.

` The combustion chamber 7 and'the mixing chamber 11 are both provided with inner linings 15 of refractor material and with outer linngs 16 of heat nsulating brick which is surrounded by a powdered insulating material 17, such as kieselguhr. or the like. This structure is contained within a metallic casing 18. From the m'ixing chamber 11 the products'of combustion pass through spaced openings 19, over half bricks'20 and between whole bricks 21, upwardly through a vertical flue 22 into the forw ard'end of the heating flues C. The heated gases are drawn through the flues C at sub-atmospheric pressure by a common draft producing device (not shown) mounted adjacent the rear end of the'leer A. If desired, the leer may be provided with controlled openings into the vertical flue 22 whereby to distribute the gases to the several flues as shown in the aforesaid patent.

A pair of vanes 23 are pivotally mounted by their upper edges to the corners of the wall at which an air flue 2& connect-s vertica lly with the air port 13. The lower ends of said vanes 23 are pivotally connected to a rod 25 in-such a manner that their surfaces are parallel. Mounted on the framework of the firebox adjacent the end of the flue 24 is a bracket 26 through which the rod 25 is mounted, and which is provided with a thumb screw 27 which Contacts with the rod 25 and holds it in any predetermined position so as to deflect the air in a preferred direction.

In operation, the products of combustion, created in the combustion chamber 7, pass through the opening 9 into the mixing chamber 11.. As these products of combustion enter the mixing chamber, they pass over a port 13 through which atmospheric air is admitted in regulable quantities to cool them.

Due to perhaps very slight inaccuracies in the arrangement of the burner 5 in relation to the opening 6, slight errors in the construction' of the chambers 7 to 11, the passage 9, or the baflie 12, or to drafts outside of the leer which afi'ect the strength of the current of air. entering through the port 13, the products of combustion may have a tendency to flow more readily around one end of the bafiie 12 than around the other, and they thus cause the flues on the side of the .leer toward which they flow more strongly to be heated to a higher The control is regulated until the temperature of the flues have reached a substantially uniform condition.

It is to be understood that the hereinbefore described embodiment of my invention is for illustrative purposes only and various changes may be made therein without depa'rting from the spirit and scope of my invention as embodied in the following claims.

I claim as my invention:

1. A firebox for a glassware annealing leer for supplying heated gases to a longitudinally extending flue associated with the leer, comprising a combustion chamber, a chamber for miXing the products of combustion with air of approximately atmospheric temperature, a passage for admitting air into said mixing chamber, and means for regulating the direction of the admission of such air to the mixing chamber.

2. A firebox for a glassware annealing leer for supplying heated gases to a longitudinallv extending flue associated with the leer, which comprises, in combination, a combustion chamber, a mixing chamber, a flue for admitting air at approximately atmospheric temperature to the mixing chamber, and vanes associated with said flue for controlling the direction of said air as it enters the mixing chamber. I

3. A-firebox for a glassware annealin leer for supplying heated gases to a longitu 'nally extending flue associated with the lee', i

comprising a combustion chamber, a chamber for mixing the products of combustion with air of atmospheric temperature, a baflle in sad mixing chamber, means for regulating the amount of air admitted to the mixing chamber, and means for directing the air entering the mixing chamber toward preferred end of the baflie.

4. A firebox for a glasswae annealing leer for supplying heated gases to a longitudinally extending flue associated with the leer, comprising a combustion chamber, a chamber for mixing the products of combustion with air of approximat'ely atmospheric temperature, fixed means for directing said mixture of products of combustion and' air of atmospheric temperature through said mixing chamber, and adjustab le means for eontrolling the direction of movement of said air at atmos heric temperature as it enters the mixing c amber.

5. A firebox f'r' a glassware annealing leer for supplying heated gases to a longitudinally extending flue associated with the leer, v

comprising a combustion chamber, means for .generating products of combustion therein,-

a mxng` chamber communicating with said combustion chamber, a passage communicating between said mixing chamber' and the outer atmosphere for the admission of atmospheric air to the mixing chamber to dilute and "cool the products of combustion therein, and means for variably dete'mining the transverse distribution of the draft through said mixing chamber by controlling the direction at which the air enters the mixing chamber, whereby to determine the transverse temperature conditions in the g ware annealing leer.

6. A firebox for a glassware annealng leer i for supplying heated gases to a pluralt of independent longitud'nally extending nes associated with the leer, comprising a. combustion chamber, means for generatm products of combustion therein, amixin c amber communicating with said combuston 'chamber, a passage communicating between said mixng chamber and theouter `atmosphere for the admission of atmospheric air to'the.

- mixing chamber to dilute and cool the products of, combustion'therein', baflle means in said mixing chamber located between the` oint of communication of the mixing chamr with said Eaage and the exit passageeof the mixing c amber and forming with the walls of the mixing chamber a par of transversely spaced passages for the heated gases, and means for variably determining the pro portion of the heated 'gases passing through each of said spaeed passages.

'i "Signed .at. Hartfo-d, Conneeticut, this 17th day of October, 1929.

WILLIAM T.

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