Rotary Compressor, Stationary Blade type compressor

ROTARY COMPRESSOR

Rotary Compressor:

  Mechanism which Pumps Fluid by using Rotating motion.

 A Compressor which uses
 Eccentric Mechanism, Vanes,
 Or other Rotating devices to provide Pumping Action.

  To Types of Rotary Compressors which are used in the Refrigeration field are:

 A. Stationary Blade type.
 B. Rotary Blade type.

These tow type Compressor can also be Classified by their Cylinder Design.

Stationary Blade type:

The Stationary blade type compressor could be called a Concentric cylinder model.

Stationary blade Compressor with blade attached to bushing mounted on revolving eccentric.
A - Eccentric shaft.
B - Bushing.
C - Cylinder.
D - Exhaust valve.
E - Inlet port.
F - Blade.

There are a few more attached in the Stationary compressor below.

• Suction pipe.
• Discharge pipe.
• Compression chamber.
• Back pressure chamber.
• Fixed scroll.
• Orbiting scroll.
• Orbiting scroll bearing.
• Frame.
• Main bearing.
• Outlet tube.
• Main chamber.
• Sub bearing.
• Crank shaft.
• DC - BL motor. 
• Internal ail pump.

  The Principle of the Stationary Blade type is that the rotating cylinder is Mounted on Eccentric shaft. This Rotating roller is sealed at its ends by plates fastened to the ends of the Cylinder. As the roller rotates, it leaves a space between the roller and the under part of the blade and the Cylinder. This apace is filled with the suction vapor from the Evaporator coil. This filling Action Continues until the high part of the roller pushes the blade Completely out of the space back into its slot. Then as the high part of the roller, this vapor charge is trapped in the Cylinder cavity. The roller now squeezes this gas into a smaller and smaller space between the upper port of the blade, the cylinder and the roller. As  may be noted, the compressor has almost a full revolution for its compressing stroke and likewise for its intake stroke. All the parts must be fitted to extremely close tolerances and Clearances. Any scores or clearances will allow the vapor s to pass by the roller surface or roller ends and reduce the efficiency of the pump.

In the Stationary blade type of Compressor, the rotor is usually a roller that Accurately fits the Eccentric, which is a fixed part of the shaft. Some Compressors have the blade attached to a bushing to provide a positive means to move the blade in and out of its slot and to provide a more positive peak proof joint between the eccentric and the blade. Puts extra wear on the Eccentric surface and the inner surface of the bushing.