Continuous infrared furnace

• US 7,514,650 B2
• Filed: 12/08/2005
• Issued: 04/07/2009
• Est. Priority Date: 12/08/2005
• Status: Active Grant

• Current Assignee: Illinois Tool Works Inc.
• Original Assignee: Despatch Industries, Inc. (Illinois Tool Works Inc.)
• Inventors: Weierke, Matt, Melgaard, Hans L.
• Primary Examiner(s): FUQUA, SHAWNTINA T
• Application Number:
  US11/297,213
• Publication Number:
  US 20080296283A1
• Time in Patent Office: 1,216 Days
• Field of Search: 219/388, 219390- 1, 219/393, 219/395, 219401-411, 219/521, 392/417, 392/411, 432/121, 432/123, 432/137, 432/3, 432/76, 432/144, 432/64, 374/208, 374/179
• US Class Current: 219/388
• CPC Class Codes: F27B 9/02 of multiple-track type; of multiple-chamber type; Combinations of furnaces
• CPC Class Codes: F27B 9/066 heated by lamps
• CPC Class Codes: F27B 9/202 Conveyor mechanisms therefor
• CPC Class Codes: F27B 9/24 being carried by a conveyor transport by conveyors in general B65G
• CPC Class Codes: F27B 9/30 Details, accessories, or equipment peculiar to furnaces of these types
• CPC Class Codes: F27D 9/00 Cooling of furnaces or of charges therein F27D1/00, F27D3/00 take precedence

Abstract

A furnace of controlled heating and treatment of material using infrared radiation. The furnace is capable of continuous infrared treating of material with consistent radiation being applied to the material, ease of access to the furnace for maintenance cleaning and repair, excellent control of radiant cooling of the material to be treated, and ease of maintenance of a volatile component condenser.

Claims

1. A furnace comprising;

a. a heat transfer zone for heating a material to be treated having an upper portion and a lower portion;

b. a conveyor that transports material to be treated through the heat transfer zone along a direction of travel

c. a jack that allows movement of the lower portion of the heat transfer zone to allow internal access to the heat transfer zone; and

d. air mover and a condenser with a heat transfer element, wherein the heat transfer element of the condenser is removable for cleaning and maintenance.

2. The furnace of claim 1, wherein the heat transfer zone contains infrared lamps.

3. The furnace of claim 2, wherein the infrared lamps are selected from a group consisting of quartz lamps, silicon carbide lamps, and tungsten halogen lamps.

4. The furnace of claim 1, wherein the conveyor is a conveyor belt.

5. The furnace of claim 1, wherein the heat transfer element is made of stainless steel.

6. The furnace of claim 1, further comprising conveyor supports that are oriented more parallel than perpendicular to the direction of travel of the conveyor.

7. The furnace of claim 6, wherein the conveyor supports are oriented slightly skew to the direction of travel.

8. The furnace of claim 7, wherein the conveyor supports are oriented so as to allow consistent radiation to the material to be treated from lamps on the other side of the conveyor supports from the material to be treated.

9. The furnace of claim 6, wherein the conveyor supports are oriented in a herringbone fashion.

10. The furnace of claim 6, wherein the conveyor supports are oriented in a repetitive converging fashion.

11. The furnace of claim 6, wherein the conveyor supports are oriented in a zigzag fashion.

12. The furnace of claim 1, further comprising:

e. a cooling zone for cooling the material to be treated; and

f. a radiant cooler in the cooling zone that uses water at a pressure of 60 psig or higher as a cooling medium;

wherein the conveyor transports the material to be treated through the heat transfer zone and the cooling zone along the direction of travel.

13. The furnace of claim 12, wherein the radiant cooler is black anodized.

14. The furnace of claim 12, wherein the radiant cooler is made of aluminum.

15. The furnace of claim 12, wherein the water used in the radiant cooler is at a pressure of 80 psig or greater.