Claims
- 1. A combination microwave gas convection oven comprising:
- a microwave cavity having a bottom with an opening;
- a magnetron positioned below said cavity;
- a waveguide for coupling microwave energy from said magnetron to said cavity through said opening;
- a chamber positioned behind the back wall of said cavity and communicating therebetween by a plurality of perforations in said back wall, said chamber having a floor with an aperture;
- means for recirculating air between said chamber and said cavity, said recirculating means comprising an outlet vent for exhausting a small percentage of recirculating air from said oven, said recirculating means creating a slight negative pressure in said chamber wherein an induced draft is provided into said chamber through said aperture;
- a tubular gas burner positioned below said chamber for providing a gas air mixture to said chamber through said aperture in said floor of said chamber, the size of said aperture restricting the amount of secondary combustion air flowing therethrough in said induced draft toward said slight negative pressure thereby increasing the efficiency of said burner; and
- said burner having a plurality of top ports, said burner having a port loading of less than 25,000 Btu per hr-sq in. of port area at the maximum operating Btu rate of said burner.
- 2. The oven recited in claim 1 further comprising means positioned in said cavity for coupling microwave energy from said opening into said cavity, said coupling means comprising a rotating member forming a radial waveguide in combination with portions of said bottom of said cavity.
- 3. The oven recited in claim 1 wherein said top ports define pairs of elongated slots perpendicular to the length of said tubular burner.
- 4. The oven recited in claim 3 wherein the dimensions of said slots are approximately 0.5 inches by 0.03 inches.
CROSS-REFERENCE TO RELATED CASES
This is a continuation of application Ser. No. 225,078, filed Jan. 14, 1981, now abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2912124 |
Oct 1979 |
DEX |
2035767 |
Jun 1980 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
225078 |
Jan 1981 |
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