| 摘要 |
A hydraulic fan control for controlling air ventilation in a building having a plurality of fans operated by associated hydraulic motors which are connected in parallel and driven by a single pump and electric motor unit through a hydraulic fluid circuit. The speed of the fans is proportional to the volume of fluid flowing through the associated hydraulic motors per unit time, i.e., the rate of fluid flow. The volume of fluid is regulated by a shunt flow divider valve included in the hydraulic circuit and connected in parallel with the hydraulic motors. The shunt flow divider valve is in turn controlled by an electrical drive circuit responsive to variations in the ambient temperature of the air in the building. The electrical circuit provides generally stepwise increases or decreases in the hydraulic flow to each fan motor and, therefore, governs fan speed to adjust the air flow within the building and the exchange of air with the atmosphere exterior to the building thereby maintaining the building temperature at or near a chosen temperature level.
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