At present, the high-end car engine is equipped with a thermal switch component, its structure is shown in Figure 1a. Working principle: The sensing body 9 picks up the high temperature, and the temperature warming wax 8 expands. The diaphragm 1 moves the push rod 7 up, pushing the lever piece 2 to a certain distance, and the contact pair 6 is suddenly closed (Fig. 1b). The sensing body 9 picks up the low temperature, and the temperature-sensitive wax 8 shrinks. When the push rod 7 returns to a certain distance under the pressure of the lever piece 2, the contact pair 6 is suddenly disconnected.
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