| 摘要 |
An oven having an electrical resistance heater and a heat exchanger to maintain a constant temperature in an oven chamber cavity. The heat exchanger is internal to the body of the oven and adjacent to the oven chamber cavity. Air is the exchange medium in the heat exchanger to achieve a balanced, cooling effect through direct air exhaust and also to achieve zero environment effect. An inert gas may be introduced into the oven chamber cavity during the heating process to reduce oxidation. Outside air may also be introduced into the oven during the heating process. Electrical circuitry provides for controlling the temperature range of the oven, for generating a signal for servo motor control of a damper in the heat exchanger, and a high limit temperature controller to disable the electrical resistance heater when an over temperature condition is reached.
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