| 摘要 |
A steam sensor control for an electrically heated water boiling appliance comprises a thermally-responsive actuator in the form of a helix 9 of Titanium-Nickel-Copper alloy shape memory effect (SME) material. The actuator develops a high force and substantial movement and enables a sealed steam sensor control to be achieved wherein the switching contacts 5, 6 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 7 formed of silicone rubber, the diaphragm seal 7 having an integrally moulded push-rod 8 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, 5, 6 via a bistable trip lever 3. |
