| 摘要 |
The invention relates to a control device for a system for regulating the ventilation of a controlled-atmosphere room. The system has at least one sensor located in the room to pick up desired information such as temperature, humidity, carbon dioxide level, or other similar levels, or occupancy or nonoccupancy of the room. A valve, of the deformable bladder type, is located in the ventilation duct of the room and the system is controlled by the control pressure of the valve as a function of information picked up by the sensor. This control device has, in combination, a pressure divider designed to deliver the control pressure of the valve based on the different pressures of pressure sources to which it is connected, two capsules deformable in accordance with instruction signals received and acting on a movable element of the pressure divider with reverse effects to cause the control pressure to vary as a function of the aforesaid instructions, power supply means for changing the internal pressure in the capsules as a function of the instructions received, means associated with the capsules providing independence from the effects of variation in atmospheric pressure, and a control element for the power supply means that is able to receive a signal emitted by the sensor and, in a predetermined cycle, composed of a series of powering and relaxation periods of the two capsules, to emit a signal controlling control pressure P3.
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