Abstract Rotary drying drum for high-speed drying of thin webs such as paper or the like comprising a hollow cylinder mounted for rotation and adapted to receive a condensable fluid and discharge condensate. Improved heat transfer is obtained by spoiler bars positioned around the inner drum circumference generally parallel to the drum axis. The invention includes dividing these bars into segments and attaching each segment; a single fixture may be used for each segment and end contact with adjacent bar segments prevents the segments from rotational movement around the fixture point. As a result, performance is improved due to the ability of the bar segments to expand and flex with the drum''s surface without excessive stress on the attaching fixtures.
In a rotary drying drum having journals for mounting the drum, a connection for supplying a condensible fluid, a condensate removal connection for removing condensate out of the drum, and a plurality of bars extending lengthwise of the drum and disposed on the inside surface of the drum for giving turbulence to the condensate in the drum, the improvement wherein said bars are comprised of segments which are attached to the inside surface of the drum and maintained in position by contact with the ends of adjacent segments, each of substantiaLly all of said segments being attached by a single fixture.
Claim 2
Dependent Claim
101 words
In a rotary drying drum having journals for mounting the drum, a connection for supplying a condensible fluid, a condensate removal connection for removing condensate out of the drum, and a plurality of bars extending lengthwise of the drum and disposed on the inside surface of the drum for giving turbulence to the condensate in the drum, the improvement wherein said bars are comprised of segments which are attached to the inside surface of the drum and maintained in position by contact with the ends of adjacent segments, each of substantiaLly all of said segments being attached by a single fixture.
Claim 3
Dependent Claim
43 words
The rotary drying drum of claim 1 wherein the contact between the ends of adjacent bar segments is maintained by providing a tongue on the end of one bar segment which substantially matches a groove in the end of the adjacent bar segment.
Claim 4
Dependent Claim
26 words
The rotary drying drum of claim 2 wherein the groove is slightly longer than the corresponding tongue to provide for thermal expansion of the bar segments.
Claim 5
Dependent Claim
37 words
The rotary drying drum of claim 1 wherein the contact with the ends of adjacent bar segments is provided by staggering adjacent segments and overlapping the segments so that the ends of adjacent bars contact each other.