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AN ELECTRICAL DEVICE FOR AUTOMATIC PROGRAMMING OF THE CONTROLS OF A PRESSURE STEAM STERILIZER/AUTOCLAVE AND THE LIKE PRESSURIZED STEAM VESSELS
AN ELECTRICAL DEVICE FOR AUTOMATIC PROGRAMMING OF THE CONTROLS OF A PRESSURE STEAM STERILIZER/AUTOCLAVE AND THE LIKE PRESSURIZED STEAM VESSELS
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机译：一种用于自动编程压力蒸汽灭菌器/自动灭菌器和类似压力蒸汽容器的控制的电气设备
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摘要
An electrical device for automatic programming of the controls of a pressure steam sterilizer/autoclave and like pressurized steam vessels for sterilizing bottled load and having a sterilizer chamber a steam jacket and a multiport operating valve for admitting steam into and exhausting steam from the chamber, said electrical device comprising a dial thermometer for indicating the temperature of the sterilizer chamber and having an electrical contact which closes when the temperature rises to the sterilizing temperature; a pressure a gauge for indicating the jacket pressure and having an electrical contact which closes when the pressure rises to the working pressure of the sterilizer; a compound gauge for indicating the degree of pressure or vacuum existing in the sterilizer chamber and having an electrical contact which closes when the pressure in said chamber falls to atmospheric pressure; an automatic reset timer for determining the sterilizing period and having a timer motor and normally closed change over contacts; a multi-pole rotary or selector switch for programme selection; an electric motor alongwith a reduction gear box for turning said multiport operating valve to predetermined positions; a first contactor for energizing said electric motor in one direction and having a coil and a plurality of normally open and normally closed contacts; a second contactor for energizing the electric motor in another direction reverse of aid one direction and having a coil and plurality of normally open contacts and normally closed contacts; a third contactor having a coil, a normally open contact and a normally closed contact; a fourth contactor having a coil, a normally closed contact and a plurality of normally open contacts; a first microswitch for rotating said multiport operating valve to ''ster'' position, said first microswitch being operable by a first cam mounted on the gear box assembly of aid motor a second microswitch for rotating the operating valve to slow--exhaust position said second microswitch being operable by a second cam mounted on the gear box of said motor; an electrical circuit having input terminals connectable to an external power source through a main switch and comprising; a first circuit wherein said electrical contact of the dial thermometer is connected in series with said timer motor of timer and has one of the normally closed contacts of said third contactor provided across said electrical contact of said dial thermometer, said first circuit being connected across said input terminals through the contacts of a first pole of said multi-pole rotary switch and a normally closed reset push button; a second circuit wherein the normally closed contact of said timer is connected in series with the coil of said third contactor, said second circuit being connected across said input through said normally closed reset push button and the contacts of the first pole of said rotary switch; a third circuit connected in parallel to the coil of said third contactor and having a normally open contact of the third contactor connected in series with the normally closed contact of said first microswitch, the electrical contact of said pressure gauge a start push button and a normally closed contact of said second contactor and the coil of said first contactor, one of the normally open contacts of said first contactor being connected in parallel to said electrical contact of said pressure gauge and said start push button a fourth circuit wherein the second microswitch is connected in series with the coil of said second contactor, said fourth circuit being connected to the changeover contact of the first timer through the contacts of a second pole of the rotary switch and the normally closed of the fourth contactor; a fifth circuit having said electrical contact of the compound gauge in series with the coil of the fourth contactor with a first normally open contact of the fourth contactor connected across said electrical contact of the compound gauge, said fifth circuit being connected to the changeover contact of said first timer; a sixth circuit connected across said coil of the fourth contactor and comprising a second normally open contact of the fourth contactor connected to an alarm device through the contacts of a third pole of said rotary switch; a seventh circuit comprising one of more normally open contacts of the first contactor connected in parallel to one or more normally open contacts of said second contactor, said seventh circuit being provided between the terminals of the motor and the contacts of the first pole of said rotary switch.
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