| 摘要 |
A paddle type flow detector for an explosive environment is mountable onto a pipe. The detector includes a structure for mounting to a pipe, a substantially sealed switch housing containing an electrical switch, and a paddle located within the pipe. A lever mechanism connects to the paddle and extends up through the mounting structure and to the switch housing. A spring is contained between the switch housing and the mounting structure and is connected between the lever mechanism and a screw adjustable spring block. The spring is contained within a spring compartment formed between the switch conduit and the mounting structure. A slide rod is operatively connected to the lever mechanism and to the switch to change a state of the switch upon sliding movement of the slide rod. The slide rod is tightly fit within a bore of the switch housing and blocks a flame path between the switch housing and the spring compartment. By isolating the spring compartment from the switch housing, explosions within the switch housing are prevented from propagating to the spring, such explosions otherwise causing a change in the spring characteristics and bias force of the paddle of the detector.
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