FOOD PRODUCT DRYING APPARATUS Russian patent published in 1997 - IPC

FIELD: food product drying equipment. SUBSTANCE: apparatus has housing defining drying chamber and provided with door, retainer and outlet gaged opening. Netted pallets are positioned within drying chamber. Apparatus is further provided with pressure chamber, where electric fan and electric heater are positioned. Gaged opening section area does not exceed working section of electric fan and is not below working section of space between pallet, housing wall and door to provide for effective cooling of electric fan winding. Pressure chamber wall has opening communicated with atmosphere. Working section area of this opening may be adjusted. Housing wall is covered with heat-insulating material. Apparatus has thermal switch and protective screen. Thermal switch is connected to mains at power supply input. Protective screen is mounted between drying and pressure chambers. Apparatus is further provided with thyristor circuit, power level switch, control unit and temperature sensor. Thyristor circuit and power level switch are connected in series to electric heater power circuit. Control unit has one input connected to temperature sensor and other input connected to power level switch. Output of control unit is connected with control input of thyristor circuit. EFFECT: increased efficiency and improved quality of product. 4 cl, 2 dwg