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Transverse Flow of Fluid to Control Profile Parameters in a Conveyorized Furnace

IP.com Disclosure Number: IPCOM000085463D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Suthar, BM: AUTHOR

Abstract

Normally a furnace equipped with a conveyor belt is divided into several zones. Profile parameters will determine the temperature of individual zones, the temperature which should increase in stages. Each zone is provided with a set of controls and heaters, which will heat the product by raising the temperature of the surrounding atmosphere first. Cooling of the product will be accomplished in a similar manner.

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Transverse Flow of Fluid to Control Profile Parameters in a Conveyorized Furnace

Normally a furnace equipped with a conveyor belt is divided into several zones. Profile parameters will determine the temperature of individual zones, the temperature which should increase in stages. Each zone is provided with a set of controls and heaters, which will heat the product by raising the temperature of the surrounding atmosphere first. Cooling of the product will be accomplished in a similar manner.

To maintain the temperature integrity of a particular zone by reducing or eliminating a heat loss or gain between the zones, has always been a problem in furnace design technology. One widely accepted way to achieve this objective is to introduce a fluid curtain from the top of the muffle. While this design works, it has not proved to effect a perfect barrier.

The design illustrated includes an adequately designed plenum chamber 10 with perforated walls 11, but a solid bottom 12. When a fluid at about 40 PSIG pressure is introduced in the chamber, it is stratified with maximum volume and minimum velocity, so as not to disturb the product 13. The fluid will pass through the wire mesh belt 14 and be exhausted through the bottom 15 of the muffle by several suitably spaced vacuum ports 16.

The vacuum can be controlled by suitable valving. Thus, the concept of creating a perfect curtain in a direction perpendicular to that of the belt motion is achieved. This will create a barrier...