Construction and Working of Rotating Blade (Rolling Vane-Type) Rotary Compressor

Rotary vane compressor working cycle

🔗Rotary compressor working, applications, advantages and disadvantages
🔗Working of Stationary blade type (Rolling piston) rotary compressor

Rolling vane type compressor has a roller inside a stationary cylinder. Roller has two or more vanes positioned in the slots of the rotor. Vanes rotate with the roller and ride on the cylinder wall. The roller may have as many as eight vanes. The more the number of vanes it has the more the efficient compressor will be. A roller moves the vanes slides in and out of the roller to create a sealed space for compression. As roller continues to rotate this space get decreased, and causing compression of fluid (refrigerant) trapped inside this space during the suction.

Since the suction of fluid continues, it does not require a suction valve. However, a check valve is provided in the suction line to avoid leakage of fluid high-pressure side to the suction line while it is idle. Since there is no clearance volume (negligible) all the fluid flows inside the space is get discharged through the discharge port. That is one of the main reason for its high efficiency.

Figure shows a diagram rolling vane type compressor. The suction port is larger than the discharge port, it facilitates low-pressure fluid to enter more readily. As vane passes by intake port, the fluid flows into the space between the roller and cylinder. The fluid flow until it gets trapped by next vane. As the vanes rotate, the space trapped fluid in front of the vane get compressed by decreasing the space between the rotor and the cylinder.

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