| 摘要 |
FIELD: agriculture. SUBSTANCE: vessel 1 is filled with fluid 2, which intensively expands during heating and evaporates too little, for instance, with fluid machine oil. Float 3 is installed on the surface of fluid 2. Installed in float 3 is rod 4 passing through guide bushing 5. Gate 6 is installed on rod 4 with a gap. Gate 6 is located between two stops 7 parallel to frame 8 installed on the intermediate vessel 9. Air duct 10 is brought from intermediate vessel 9 beyond hotbed 11. At the rated temperature in hotbed 11, gate 6 is located on frame 8. When temperature rises above the rated value, level of fluid 2 in vessel 1 rises too. Float 3 rises together with fluid level and raises gate 6 above frame 8. Inner volume of hotbed 11 is communicated through intermediate vessel 9 and air duct 10 with outside atmosphere. When temperature in the hotbed is below the rated value, the float lowers together with fluid level and presses by its weight the gate to frame to shutoff the communication with outside atmosphere. EFFECT: improved design. 9 cl, 6 dwg |
