| 摘要 |
PURPOSE:To deliver a constant amount of deodorizer at all times irrespective of a temperature change, by enclosing the deodorizer or the like in a bag formed of a semipermeable membrane having a gas permeability, and changing an area of a passage communicating the inside of a case with the outside thereof according to a change in shape of the bag due to the temperature change. CONSTITUTION:When a float 2 is moved up and down, an area of a passage defined by a conical hole of a case body 1a and a conical projection of the float 2 is changed. When the float 2 is lifted to its upper limit position, the area of the passage becomes equal to a minimum passage area 2a. A deodorizer pack 3 is formed by enclosing a felt impregnating a deodorizer 6 in a bag of a semipermeable polyethylene film having a gas permeability. A case body 1b and the float 2 are formed integrally with ribs 7 and 8 for supporting the pack 3, respectively. With ribs arrangement, as an ambient temperature increases, a quantity of the deodorizer 6 to be vaporized is increased to increase a thickness of the pack 3. As a result, the float 2 is lifted by the pack 3 to decrease the passage area, thus preventing excess delivery of the deodorizer 6. |
