Both rolling piston and rolling vane compressor, it compresses the fluid by decreasing the space between the roller and cylinder.
In both types, the blade is allowed to move up and down (reciprocate) in the slot to make a sealed compartment between cylinder and roller.
Difference between stationary blade and moving blade type rotary compressor
In rolling piston, the roller is eccentrically mounted on a shaft which is concentric to the cylinder. In rolling vane, the roller is concentrically mounted to a shaft which is eccentrical to the cylinder.
In rolling piston type, the roller rolls around the inside wall of cylinder and blade move up down to make contact with the roller. In rolling vane type, the roller rotates inside the cylinder (not rolls around the wall) and the blade moves up and down in the slots on the roller to keep contact with the cylinder wall.
In rolling piston, the blade separates low pressure and high-pressure side while the roller rolls over the inside wall of the cylinder. In rolling vane type, the roller tightly touches only at the point between suction and the discharge port and this separates high pressure and the low-pressure side of the compressor.
Rolling piston rotary compressor has only one blade. Rolling vane compressor has more than one blade. It may have as many as eight blades. More the number of blades more the efficiency will be.
In rolling piston type, the single blade/ vane is attached in the slots on the cylinder. While in rolling blade type, the vanes are attached on the slots of the roller and it rotates along with roller.
