| 摘要 |
<p>A steam sensor control for an electrically heated water boiling appliance comprises a thermally-responsive actuator in the form of a helix of Titanium-Nickel-Copper alloy shape memory effect (SME) material. The actuator develops a high force and substantial movement as compared with a bimetal and enables a sealed steam sensor control to be achieved wherein the switching contacts of the control are housed within a body part of the control and are isolated from the SME sensor, which is on the outside of the control body part, by a diaphragm seal formed of silicone rubber, the diaphragm seal having an integrally moulded push-rod which on the steam (wet) side of the diaphragm serves as a mounting for the SME helix and on the dry side operates the switching contacts via a bistable trip lever.</p> |
