摘要:
A control system for a top plate surface heating unit having a softening temperature. The control system incorporates a temperature setting means for determining the operating temperature of the surface heating unit and means for automatically limiting the temperature of the surface heating unit to a temperature below the softening temperature of the top plate.
摘要:
A microwave oven for cooking food with microwave energy on a slow simmer cycle. The oven includes a closed vessel in which food is to be cooked slowly for many hours at a simmer temperature. A control apparatus is furnished for monitoring the temperature of the food in the vessel, and it has a temperature-sensing probe adjacent the bottom wall of the vessel. The probe is connected in circuitry for controlling the power level of the microwave energy to medium power, as well as controlling the maximum food temperature to just below a boiling temperature.
摘要:
A rack for use in a microwave oven cavity wherein the microwave energy enters the top of the cavity and the cavity has a rectangular shaped bottom shelf and sidewalls. The rack includes a metal rectangular framework of parallel bars and the framework is spaced inwardly of all sides of the cavity. The rack has legs depending from the corners of the framework and extending downwardly and diverging outwardly from the framework. Each of the legs has low loss dielectric insulating material on the terminal end thereof and the legs cooperate with the oven cavity bottom shelf and sidewalls such that the framework of the rack is centered relative to the cavity sidewalls and electrically insulated therefrom. With this rack two levels of food may be cooked simultaneously in the microwave oven.
摘要:
A method for making a combination heater and temperature sensor comprising the steps of forming a heater element pattern in a thin sheet of resistive material and concurrently forming a temperature sensor in a non-interfering portion of the same sheet of resistive material, the forming of the heater and sensor element patterns being carried out by a photoetching process.
摘要:
A sliding latch mechanism for the door of a heated cavity, such as a microwave oven that is provided with a pyrolytic self-cleaning oven cycle. This latch mechanism has a handle with only two positions; namely, a first unlatched position and a second latched position. The second latched position has two separate modes or functions; namely, an unlocked function and a locked function. The first unlatched position of the handle may be considered as providing an unlatched function. This first unlatched position of the handle is used for opening the door when needed, or when cooking within the oven with standard radiant heating means. The second latched position of the handle in its unlocked mode is used for microwave cooking alone or for combined microwave and radiant cooking. The second latched position of the handle in its locked mode is used during the pyrolytic self-cleaning oven cycle when the oven door should not be opened or capable of being opened when the oven temperature is above normal cooking temperatures in the self-cleaning temperature range.
摘要:
A microwave oven browning system incorporating a combination microwave and hot air convection oven. The microwave cooking is carried out by use of a magnetron feeding a waveguide having a top branch on the top wall of the oven, a side branch on the side wall of the oven, and a bottom branch on the bottom wall of the oven. The convection cooking is carried out by directing heated air through a plurality of inlet openings in the top wall of the oven which are dimensioned to progressively increase in size in a downstream direction to ensure even distribution of heated air to the oven and a return air opening in the lower portion of the oven which ensures that air will flow over the top and bottom of food being cooked in the oven.
摘要:
A microwave oven with a dual feed excitation system comprising in one form of the invention a rotating antenna supported from the top cavity wall and a slotted radiating chamber supported from the bottom cavity wall. The antenna and radiating chamber are coupled to the magnetron output probe by a waveguide having a central section for receiving energy from the magnetron probe; a first section for coupling energy from the central section to the antenna and a second section for coupling energy from the central section to the radiating chamber. The fractional apportionment of the total energy from the magnetron between antenna and radiating chamber is a function of the impedance presented by each. The impedance of the antenna varies as the antenna rotates. The impedance of the chamber is particularly sensitive to food load parameters such as dielectric constant, which changes as the food cooks. Thus, the fractional distribution of energy between antenna and chamber varies during the cooking process, resulting in improved cooking performance.
摘要:
In a cooking oven supplied from a power source of limited capability, a time ratio control system alternately energizes a microwave energy generating system and an electrical resistance heating element a plurality of times during each cooking operation to, in effect, time share the available power. The resultant concurrent microwave and electrical resistance provides improved cooking results when the power source capability is limited.
摘要:
Method and apparatus for testing microwave oven cavities during the oven fabrication process after the cavity forming operation is complete. The cavity to be tested is positioned front frame resting on a test plate containing a non-protruding microwave power source and choke/ferrite attenuators. The power source radiates into the interior of the cavity and microwave leakage is measured at the cavity exterior.
摘要:
A unitary air conditioner unit adapted to be mounted through a wall opening of an enclosure to be conditioned including an air sensing system operative for generating a signal dependent on the level of gases in the enclosure air. The control is operable for adding outside air to the circulating enclosure air or for exhausting enclosure air when a first level of gases sensed and for causing an alarm to sound when the level of gases is above a predetermined value.