US2182173A

US2182173A - Glassware annealing lehr

Info

Publication number: US2182173A
Application number: US158323A
Authority: US
Inventors: Francis E Dorsey
Original assignee: Hartford Empire Co
Current assignee: Hartford Empire Co
Priority date: 1937-08-10
Filing date: 1937-08-10
Publication date: 1939-12-05
Anticipated expiration: 1956-12-05

Description

Dec. 5, 1939., F. E.. DoRsEY GLASSWARE ANNEALING LEHR 1957 2 Sheets-Sheet l Filed Aug.

53 In ven for:

Fran c 13112D0125@ Witness:

Q. Q. mm.

A 'orn egg.

?atented Dec. 5, 1939 GnAsswARE ANNEALING Lann Francis E. Dorsey, Hartford, Conn., assignor to Hartford-Empire Company, Hartford, Conn., a corporation of Delaware Application August 10,

6 Claims.

This invention relates to glassware annealing lehrs and has particular relation to fireboxes arranged in heat exchanging relation with the tunnels of such lehrs.

The general object of the present invention is to provide a firebox of the type which is in heat exchanging relation with the lehr tunnel, including means of novel construction within the firebox for varying the heating of the tunnel by the lo :rebox without varying the total amount of heat generated in or by the rebox.

A more specic object of the invention is to provide a rebox of the above type containing means of novel construction for varying the heat- 35 ing effect of the rebox on the adjacent portion of the lehr tunnel without varying the heating eiect on other portions of the tunnel over the mulfles or ues to which hot combustion gases are supplied by the iirebox.

Further objects and advantages of the invention will be explained in or will be apparent from the following description of the preferred embodiment shown in the accompanying drawings, wherein Figure 1 is a View in central vertical section of the front end portion of a lehr` showing the rebox and immediately adjacent structure, said view being taken on the line I-l of Fig. 2;

Fig. 2 is a view in horizontal section taken on the line 2 2 of Fig. 1, parts being broken away for clarity in illustration;

Fig. 3 is a view in transverse vertical section taken on the line 3-3 of Fig. 2;

Fig. 4 is a similar view taken on the line 4-4 l of Fig. 1; and

Fig. 5 is likewise a view in vertical transverse section taken on the line 5--5 of Fig. 2.

Referring in detail to the drawings, the lehr tunnel is indicated generally at 6. The roof of E the tunnel is composed of refractory material 1 backed by insulation 8 and metal sheathing 9.

Similarly the side walls II-II are built up from refractory material |2I2, insulation |3-l3 and metal sheathing I 4|4. It will be understood that only the hot end portion of the lehr is shown and that the refractory lining and insulation need not extend throughout the full length of the lehr, but may be terminated in the cooler zones thereof.

My invention has been illustrated in the drawings as it may be applied to the lehr or type of lehr shown in the United States Patent to Donald G. Merrill, No. 2,1333 84, granted October 18, 1938. The drawings and description are conned to such .I parts as are included in or directly associated 1937, .Serial No. 158,323

with my invention and further details of the general construction and operation of the lehr may be ascertained by reference to'said application.

Passing through the lehr tunnel is an openwork ware conveyor l 5 of known type which rides on spaced stationary supports I8 and over rollers Il, I8 and I9. Beneath the front end of the tunnel is rebox 2|. The top 22 of the rebox may be composed of a series of refractory tiles of high heat conductivity spaced somevdistance below the conveyor. At the very front of the rebox is transverse combustion chamber 23 in which a flame is produced by burner 24 (Fig. 3) associated with port 24a located in one side of the 15 rebox at one end of the chamber 23. The hot gases leave the chamber at its other end through outlet 25 and pass laterally and longitudinally through the iirebox toward the rear or discharge end portion or space thereof indicated at 26. 20 The paths of the gases are indicated approximately by the arrows in Fig. 2.

In order to dilute the hot gases to the desired working temperature, air may be admitted through ports 21-21 in the bottom of the rebox. Suitable valves or dampers, as indicated at 21a, Fig` 2, may be associated with the inlet ends-of these ports.

It will be understood from the description of the structure so far referred to that the rebox Will heat the portion of the tunnel and the Ware on the conveyor passing through such portion which is above the top 22 of the rebox. In order to vary such heating, my invention includes a lower passage or duct 28 through which more or less of the hot gases may be diverted on their passage into the discharge end portion 26 of the firebox. The sides 28a-28a and top 28h of this duct are formed of suitable refractory tile and the top 28b thereof is spaced from the top 22 of the rebox. Therefore, such heat as passes into the lehr tunnel from the gases owing through the duct 28 is materially reduced because it must pass through twoA thicknesses of material and the space between the top of the duct and the top of the rebox. A block 28e of refractory material is located over the entrance end of duct 28 which assists in directing the hot gases into said duct.

The diversion or by-passing of gases through duct 28 is controlled or regulated by dampers. 'I'he central damper 29 (Fig. 1) cooperates with the discharge end of duct 28. At the sides of duct 28 are spaces or passages 30-30 (Fig. 2) in which dampers 3I-3I operate to more or less obstruct the flow of gases into the discharge end 26 of the rebox. These dampers 29 and 3l-3I are located near the exit end of duct 28, being mounted on a horizontal transverse shaft 32 having a handle 33 on one of its ends (Figs. 2 and 4) and for setting and holding the dampers 29 and 3l-3I in the desired positions. The central damper 29 is fixed on the shaft 32 at a Btl-degree angle with respect to side dampers 3I3l.

Looking at Fig. 1, it will be seen that when damper 29 is down and the end of duct 28 is unobstructed, dampers 3l-3I will be up in position to obstruct the iiow of hot gases through spaces 30-30 past the sides of the duct, but when shaft 32 is turned counterclockwise, damper 29 will be raised to obstruct the discharge opening of duct 28 and dampers 3I--3l lowered toward non-obstructing positions in spaces 30-30. Dampers 3l-3I are shown in Fig. 1 in positions at a slight angle beyond the vertical with their upper ends engaging a manifold or header 35, provided for a purpose hereinafter explained, extending approximately the full width of the irebox, as shown in Fig. 2. In such positions, dampers 3l-3l do not fully close spaces or passages 30-30 because openings are left between them and the end of duct 28, as shownin Fig. l. Also, if the dampers 3I--3I are set in vertical position, spaces above them and above the duct 28 exist through which a certain reduced flow of gases will be permitted (see Fig. 4). In either case, however, the major portion of the gases will flow through duct 28. It will be obvious that the dampers 28 and 3I-3I may be adjusted to diiferent angles to vary through a wide range the heating of that portion of the lehr tunnel which is over the rebox. It also will be understood that irrespective of the positions of the dampers, the total quantity of gases delivered from the firebox need not be varied, and therefore the temperature condition in the lehr tunnel over the rebox may be varied without aiiecting the temperature in the lehr tunnel beyond the irebox. The hot gases, upon leaving the iirebox, enter longitudinally extending ues or muflies 36-36 located near the side walls and bottom of the lehr tunnel and below conveyor I5. See Figs. 2 and 5. These flues contain flues 31-31 for air which is conducted therethrough to manifold 35 to which ilues 31-31 are connected. A portion of this air is discharged from the manifold 35 through jets 38 toward the front end of the lehr to prevent indraft through the entrance; the remainder of the air is taken oi through longitudinally extending pipes 39-39 having nozzles 40 at intervals along their lengths for directing jets of air laterally between partitions BI on the bottom of the tunnel toward the side walls of the lehr. The flow of air through jets 38 is controlled by valves 42-42 which are adjusted by means indicated at 42m-42a (Figs. 2 and 4). Such arrangement of flues and jets is for the purpose of controlling the temperature and the circulation of air in the lehr tunnel in the desired manner and as explained more fully in the application of Donald G. Merrill referred to above. However, it is to be understood that my invention is not limited to use with the specic arrangement of flues and jets illustrated and described, but may be employed in any type of lehr which is adapted to be heated by a flrebox which. serves to directly heat the lehr tunnel. Such a rebox may be referred to as a muflie or mullie type of flrebox.

Various changes in the construction and operation of the illustrated embodiment of the invention may be made without departing from the scope of the claims.-

What I claim is:

1. In a glassware annealing lehr, a firebox having a portion thereof in heat exchanging relation with the tunnel of said lehr, said portion of the v iirebox being heated by contact of gases of combustion therewith, and means for varying the application of heat to said tunnel by said portion of the firebox comprising a duct extending through said rebox, and means for diverting a substantial portion of said gases oi combustion through said duct.

2. In a glassware annealing lehr, a iirebox having a wall common to a wall of the tunnel of the lehr for the application of heat from the firebox to the lehr tunnel, said Wall being heated by gases of combustion in said rebox, a duct in said iirebox for diverting the flow of such gases of combustion away from said wall, and means for varying the flow of gases through said duct.

3. In a glassware annealing lehr, a iirebox of the mufile type arranged in heat exchanging relation with a portion of said tunnel, means communicating with said rebox for heating another portion of said tunnel, and means within the firebox for varying the heating of said first named portion of the lehr tunnel independently of the heating of the ysecond named portion of said tunnel.

4. In a glassware annealing lehr, a firebox of the muille type in heat exchanging relation with a portion of the tunnel of said lehr, flues communicating with, and adapted to receive hot gases from, said firebox for heating another portion of said tunnel, a duct within'said iirebox, and means for diverting a portion of the hot gases produced in said irebox through said duct to reduce the heating of the first named portion of said lehr independently of the heating of the second named portion of said lehr.

5. In a glassware annealing lehr, a iirebox of the mule type arranged in heat exchanging relation with a portion of the lehr tunnel, said rebox having a combustion chamber at one end and a discharge space at the other end thereof, a duct interposed between said chamber and said discharge space, and a damper associated with said duct for regulating the flow of hot gases between said combustion chamber and said discharge space.

6. In a glassware annealing lehr, a rebox haying a wall common to a wall of the lehr tunnel, a combustion chamber in one end of said firebox, a discharge space at the other end of'said rebox,

a duct spaced from said wall and extending longitudinally between said chamber and said discharge space, spaces at the sides of said duct for the passage of hot gases along the sides thereof in heat exchanging relation to said wall, and dampers associated with said duct and said side spaces for diverting more or less of the hot gases produced in said flrebox through said duct to vary the amount of heat applied to said lehr tunnel through said common wall.

FRANCIS E. DORSEY.