Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.

Koken Ltd.

Gaku Sasaki

Takeshi Honda

Shingo Ishikawa

Hironobu Takeuchi

A centrifugal compressor includes an impeller and a housing having a scroll passage of spiral shape formed on an outer peripheral side of the impeller. When a circumferential-directional position of the scroll passage is represented by an angular position with respect to a scroll end of the scroll passage, and in a cross-section obtained by cutting the scroll passage along a plane including a rotational axis of the impeller at a circumferential-directional position where the angular position is &#x3b8;, F(&#x3b8;) is defined as: F(&#x3b8;)=(A/R)/r, where A is a cross-sectional area of the scroll passage, R is a distance from the rotational axis to a scroll center of the cross-section of the scroll passage, and r is a radius of the impeller, 0.35&#x2264;F(360&#xb0;)&#x2264;0.65, and 0.08&#xd7;F(360&#xb0;)&#x2264;F(60&#xb0;)&#x2264;0.4&#xd7;F(360&#xb0;).

Centrifugal compressor and turbocharger including the same

An air cleaning apparatus capable of predicting a breakthrough time of a filtering portion is provided. Regarding a maskas one example of the air cleaning apparatus, data on concentration of the poisonous gas element with which in ambient air () is contaminated on the upstream side of a filtering portion (), a flow rate of the air () passing through the filtering portion (), a temperature of the air (), and relative humidity of the air () are input to an arithmetic processing unit (). A breakthrough-time prediction formula in which the concentration, the flow rate, the temperature, and the relative humidity are provided as variables is programmed in the arithmetic processing unit (), and the breakthrough time of the filtering portion () is calculated through the prediction formula, based on the data on the concentration and the like.

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Tokyo, Japan

Gaku Sasaki