| 摘要 |
PURPOSE:To prevent deterioration of temperature regulating function for long term by arranging a negative pressure control valve in a filter case having a filter of finer mesh than that of the filter element in air cleaner. CONSTITUTION:Prior to warming, the bimetal 11 in negative pressure control valve 9 will contact the valve body 12 tightly against valve seat 22 to communicate both hoses 10a, 10b thus to feed the air warmed through suction mainfold into air cleaner 2. After warming, said bimetal 11 will open the negative pressure control valve 9 to open the valve chamber 26 to the atmosphere then close the warm air suction tube through the hose 10a thus to feed cool air into the air cleaner 2. The atmospheric air for diluting the negative pressure in valve chamber 26 is filtered through a filter 17 having mesh finer than that of filter element in air cleaner 2 to prevent adhesion of dust or oil to the valve body 12 or orifices 12a, 12b. Consequently, solidification or choking due to accumulation of dust or oil is prevented resulting in stable function of suction temperature regulation for a long term.
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