| 摘要 |
The invention relates to a variable capacity compressor for use in automobile air conditions, for example. The variable compressor allows the cooling capacity to be continuously changed with fine control of the cooling capacity as required. The variable compressor comprises an enclosure having cylindrical internal space. A cylindrical-shaped rotor is rotatably held in the enclosure and driven by an external force and has vanes. Plural return ports are formed on a wall of volume-decrease-step space in the internal space wherein the volume of sectioned space by movements of the rotor and the vanes is changed cyclically. An exit is formed on the wall of volume-increase-step space in the internal space wherein the volume of sectioned spaced by movements of the rotor and the vanes is changed cyclically. A C-shaped guide passage is formed in the wall for connecting the plural return ports and the exit. An arc-shaped slider is provided slidably in the guide passage for opening and closing the plural return ports with a pressure control compartment retained in the guide passages. A bias spring is provided for urging the slider in a direction to close the return ports. Control pressure supply means supplies control pressure to the pressure control compartment and comprises a pressure detecting part which compares suction pressure with atmospheric pressure, thereby to generate a displacement thereof, a valve urged to close by a spring, a rod driven by the pressure detecting part for opening the valve, and an electromagnetic coil for applying electromagnetic force to the valve, thereby to urge the valve in a direction to open. |
