| 摘要 |
A capacity control valve is provided to move a diaphragm and a disc in the vertical direction by the elasticity of a spring for improving refrigerant control performance, thereby keeping cooling capacity uniformly regardless of an engine rpm. A capacity control valve includes a body part(4), a strainer(5) connected to a discharge chamber for introducing refrigerant gas into a refrigerant inlet of the body part, a ball valve(6) positioned at an upper end in the body part for controlling the refrigerant gas introduction, a spring(7) moving the ball valve by elasticity, a control screw(8) joined at a lower end in the strainer for the spring to press the ball valve, and upper and lower housings(9,10) serving as a lower frame of the capacity control valve. A diaphragm(11) is inserted between the upper and lower housings and has a center portion moves in the vertical direction by compression gas introduced via a suction hole at a lower part of the body part. Upper and lower discs(12,13) are positioned at upper and lower parts of the diaphragm respectively to move in a predetermined range by the compression gas. Another spring is positioned at a lower end of the lower disc for recovering the upper and lower discs to initial positions thereof by elasticity as the upper and lower discs and the diaphragm move downward by the compression gas.
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