An automatic breather device for the ventilation of hollow insulators, particularly in electrostatic precipitators

摘要

927,829. Electrostatic precipitators. METALLGESELLSCHAFT A.G. Aug. 3, 1961 [Aug. 24, 1960], No. 28302/61. Class 117. To prevent deposition of dust on a hightension lead-in or electrode support insulator of an electrostatic precipitator, the cover-plate 1 of the insulator has a breather opening, for admission of scavenging air, which is automatically controlled either by a frusto-conical valve member 6, Fig. 1, or a ball 20, Fig. 3, arranged to open and close the opening, respectively at predetermined pressures in the precipitator below and above ambient pressure. The valve prevents dusty gas within the precipitator being blown out through the openings on any rise in pressure in the precipitator above the ambient pressure. Fig. 1 shows the valve carried by one arm 8 of simple lever pivoted at 40 intermediate its ends and having an adjustably slidable counterpoise 9 on its other arm. Alternatively the valve 6 may be spring-loaded. Fig. 3 shows the opening communicating with a flattened swan-necked pipe 18, the free end of which is formed as a circular-section chamber 19 housing the ball 20 which co-operates with a hole 21 in an end cap 22.