US1679018A - Gas-tight seal for relatively-moving parts of ovens - Google Patents

Description

Jul 31, 1928. 1,679,0 18

F. BARTLING- GAS new 5m FOR mamnvrm nouns mm; or ovsns 5 Filed May 16, 1927 I 1 2 2-2. q l k 'm n n I 0 I b Patented July 31, 1928.

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s PATENT FRIEDRICH BARTLING, or MUNICH, GERMAN GAS-TIGHT-SEAL 1 R niinemrvnnr lvrovms LPARTS or OVENS.

Application filed. may 16, 1927, Serial No. 191.913, and in Germany January 15, 1927.

For the purpose of effecting a gastight closure or seal between relatively movable parts of ovens and the like for instance, between fixed and moving parts thereof, nu-

r merous varieties of so-called sand channels have, as is well; known, been employed. These sand channels consist generally of a gutter of itsection, located on one of the oven members and substantiallyfilled with H- sand, into which dips a web plate or r b secured to the other oven member. In this manner gas tight closure is effected between the interior of the oven and the external atmosphere, or between two different compartl5 ments of the oven, without impairing the relative mobility of the several oven parts involved. I

Such a. device particularly adapted for application to the so-called' revolving anac nular sole type of ovens, 111 winch, as is well. known, an annular oven chamber open at the bottom, has that opening closed by a retatingi plate which functions as the working sole plate. Obviously a gastight and heat proof closure must exist between the wall of the oven and the rotating plate, in order that the oven gases may not escape. Generally a-sand channel will be employed'for this purpose.

3i: So long as the dipping web proceeds reg ularly and without deviation between the walls of the sand channel no obstruction or other disturbance can take place within said channel. It is, however, impossible to secure such regular movementof the web; in practice oscillatory movements are set up and the web thus moves laterally within the channel, that is to say, in a direction perpendicular to the axis of rotation where a rotary 49 web member in action.v Such irregular movement, which it is practially impossible to avoid in the moving parts of large and heavy ovens, gives rise to ances which occasion considerable trouble in working. Thu. displaced, it pr the sand to one side of the channel, so that the depth of thebcd of sand on one side of the web is diminished while on the other side the sand piles up 50 against the wall of the channel. The resultof this generally is to cause the sand to overflow from the channel onto adjacent parts where its presence is undesirable. At

the same time, the amount of sand in the 5 channel is, of course, diminished, so that the secondary disturbi when the dipping web is so eflicacy of theseal is'reduced also and has to be restored by replenishing the sand bed. It is the object of the present invention to overcome these objections. According to the invention, a gas-tight seal for relatively movable oven members, with a sand channel and a web dipping therein is characterized by the fact that the lower part of the cross-section of the sand channel is bellied out to a pear-shape. This formation may be completed by so making the channel section that above the bellied portion there is a narrowed or necked region. At the same time, the dipping web is pierced from side to side with suitable apertures, for instance a row of holes may be provided in it. 7 p i The shaping of the cross-section of the sand channel in the manner above describe-d results in the first place, in preventing the sand from overflowing from the channel when the dipping web moves laterally. At the same time the sand which tends to pile up at one side of the web is forced to pass through the apertures aforesaid to the opposite side of said web. Thus there results a continuous equalization of the quantities of sand on each side of the web, while overflow and irregular distribution of the sand in the channel are completely avoided. An example of a const'uction according to the present invention is illustrated in the accompanyingdrawing, wherein:

Fig. 1 shows a sand channel with dipping web constructed according tothe invention while, 1 i

Fig. 2 shows an example of the application of said invention to an even of the annular rotating sole type As shown in Fig. 1, the oven sealing means consists of a channel a and a web 6, the channel being associated with one of two relatively movable oven parts and the web with the other of these parts. The channel a is filledwith sand so as to provide a tight closure on both sides of the web 6. Normally, when the two oven parts move relatively to one another, the web 52 will be displaced in a direction parallel to the channel walls (see arrow 0) but when irregular movements or oscillations take place lateral digression of the web, in the sense indicated by arrow d are set up. If the web Z) be displaced, for instance in the right handed direction ofthe arrow d, it forces the sand to Fig. 2, the improved no displacement of the The web I) is provided, adjacent its lower with a series of perforations it; As

edge,

reason of lateral movesoon as-the sand, by ment of the web 7), wall of the channel, it gets squeezed through the perforations h to the other side of the web, thus securing a quicker equalization of the quantities of sand on opposite sides of said web.

In the constructional example according to sand channel arrange ment is shown in its application to an oven of the annular rotating sole type, though it is to be understood that the details of this oven form no part of the present invention. The stationary, annular oven chamber 70 has an open bottom which is closed by the rotating sole plate Z which is supported at its edges by carrier rings m running on rollers n. The rotating sole Z is heated from beneath by a heatingfine 0. Between the sole Z and the heating flue 0, onthe one hand, and betwen said sole plate and the oven chamber is, on the other hand, sand channel seals are arranged. These consist severally of the sand channels a, a with corresponding webs I), Z).. The sand channel a is arranged on the stationary heating fine 0 and the web 6 on the rotating sole E. To this latter is also secured the channel a while the web I) is arranged on the fixed oven wall Z2.

It is obvious that, so long as the rotating sole Z runs true in its circular path, there is beds of sand in the sand channels. Such absolutely true rotary motion is, however unattainable and oscillations take place which result in lateral movements of the webs. The sand in the channels is then squeezed between the webs and the channel walls and would overflow but for the equalizing action due to the particular construction and arrangement of channel and web as hereinbefore described.

channel immediis forced up against the Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 2- 1. A gas tight closure or seal for interposition between relatively movable members of ovens and the like, comprising a sand channel mountedon one of said members, the walls of said channel converging toward each other at the top so the channel has a substantially pear-shaped cross-section, sand in said channel, and a web connected to the other member and dipping into the sand, so that during relative movements of said web and channel at a right angle to the di rection of the relative movement of the members, the converging walls of the channel prevent the web from forcing sand from the channel.

2. A gastight closure or seal as in claim 1, in which the webis provided with apertures beneath the level of the sand, through which the sand may pass from one side of the web to the other during such movements at a right angle.

3. A gastight closure or seal for interposition between relativelyrotating 'members of ovens and the like, comprising an annular sand channel mounted on one member, tie walls of the channel converging toward each other at the top, sand in said channel, and an annular web connected to the other member and dipping into the sand, the sand permitting relative radial movements of said channel and web with respect to their axis of relative rotation during which the convergent walls of the channel prevent the sand from being pushed therefrom. i

i. ii gastight closure or seal for inter-- position between relatively rotating members of ovens and the like, comprising an annular sand channel mounted on one member, sand in the channel, and an annular web connected to the other member and dipping into the sand, said web having holes therethrough adjacent its lower end and beneath the sand so that when said web and channel have a relative radial movement with respect to their axis of relative rotation, sand may pass through certain of said holes from one side of the web to the other. 7

In testimony whereof I have signed my name to this specification.

FRIEDRICH BARTLING.

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