| 摘要 |
An object of the present invention is to provide a simple, economical and safe driving device which is automatically activated by detecting solar light and an automatic ventilation system utilizing the aforementioned driving device. The electric motor (21) is connected to the 1-circuit 2-contact type relay switch (22), which is connected to the 1-circuit 2-contact type limit switch (23) and the 1-circuit 1-contact type light sensor switch (24). The limit switch (23) is connected between the relay switch (22) and the power supply and the manual main switch (25) between the light sensor switch (24) and the power supply. Normally when the main switch (25) is "on" and solar light exceeds the threshold of 35,000 lux, the light sensor detects it and the contact of the switch (24) changes from "a" to "b" to be activated. Electricity is then supplied to the relay switch (22) and the contact of the relay switch (22) also change "a" to "b" to be activated. If the contact of the limit switch (23) it at "b", electricity is supplied to the electric motor (21) to activate it. The electric motor is interlinked with the vent cover via the power transmission and the vent cover gradually begins to open. A specific time after the electric motor (21) is activated and the limit switch (23) comes in contact with the power transmission, then the limit switch's (23) contact changes from "b" to "a" to turn itself off. Thus the electric motor stops and the vent cover interlocked with the electric motor can stay open without operations of the manual switch. The main switch (25) normally stays in the "on" state, however, it can serve as a safety switch to forcibly shut down the system in the event of long-term shut down and maintenance.
|
