Radiant Tube
AssigneeEmisshield, Inc.
InventorsJohn W. Olver, Jason Simmons
Life of this patent
Estimating the term…
Abstract
A radiant tube assembly (12) has at least one tubular structure (14, 16, 22, or 24), and a heat source (30), with a thermal protective layer (18) is on at least one side, interior or exterior (17 or 15), thereof. An outer tubular structure (16) may be present. A protective layer (18) may be disposed on the outer tubular structure's (16) interior and/or exterior sides (17 and/or 15). A shield (26), having two sides (25 and 27) and a thermal protective layer (18) may be disposed along an exterior or interior side (27 or 25).
Claims21
A radiant tube assembly (12), comprising:
- at least one tubular structure (14, 16, 22, or 24), each tubular structure (14, 16, 22, or 24) having a length and a surface (15 or 17) exposed along the length thereof, and
- a thermal protective layer (18) disposed upon at least one surface (15 or 17) thereof, wherein the thermal protective layer (18) has
- a. from about 5% to about 40% of an inorganic adhesive, from about 45% to about 92% of a filler, and from about 1% to about 20% of one or more emissivity agents;
- or
- b. from about 5% to about 60% of colloidal silica, colloidal alumina, or combinations thereof;
- from about 23% to about 79% of a filler;
- and from about 1% to about 20% of one or more emissivity agents.
A method of manufacturing a radiant tube assembly (12) having a thermal protective layer (18), comprising:
- providing at least one tubular structure (14, 16, 22, or 24), each tubular structure (14, 16, 22, or 24) having a length and a surface (15 or 17) exposed along the length thereof
- wherein the exposed surface (15 or 17) is on an interior surface (17), or on an exterior surface (15), or on combinations thereof;
- mixing a thermal protective coating containing
- a. from about 6% to about 40% of an inorganic adhesive, from about 23% to about 56% of a filler, from about 0.5% to about 15% of one or more emissivity agents, and from about 18% to about 50% water, or
- b. from about 15% to about 60% of colloidal silica, colloidal alumina, or combinations thereof;
- from about 23% to about 55% of a filler, from about 0.5% to about 15% of one or more emissivity agents, and from about 10% to 50% water;
- and
- applying the mixed thermal protective coating to the exposed surface using a spray gun to form a thermal protective layer (18) from about 2 mils (5 microns) to about 10 mils (254 microns) thick.
Dependencies are inferred from the claim text.