The Compressor’s Structure and Principle

ES compressors are composed of two cylinders like a twin rotary compressor, as
illustrated in Figure 2. The variable capacity rotary compressor is operated such that a
compression operation is executed in one of the compression chambers having different
capacities by the eccentric unit while the idle rotation is executed in a remaining one of
the compression chambers, according to a rotation direction of the rotating shaft, thus
varying compression capacity of the compressor as desired by simply changing the
rotating direction of the shaft.


Two cylinders having a different compressing volume are operating alternatively in
opposite directions. By changing the rotational direction of a shaft, the eccentricity is
controlled and the operating mode of each cylinder is determined.

If a shaft rotates clockwise, an upper cylinder compresses the refrigerant while a lower
cylinder idles as shown in figure 3. If a shaft rotates in counterclockwise direction, only
the lower cylinder works.
ES compressor modulates the capacity in two steps by alternatively operating two
cylinders with different compressing volume according to the external load condition as
described previously. The eccentricity of a top and a bottom pump are inverted easily
according to a motor rotational direction change. The shaft assembly of ES compressor is
composed of a shaft, a driving pin, and a cam-bush. The shaft and the cam-bush are
designed in order that each pump has its own eccentricity.
The Figure 3 shows the example that the clearance and eccentricity quantity are
controlled by rotation direction change of the shaft. When the shaft rotates with
clockwise direction, the upper eccentric part of the shaft assembly shows the maximum
eccentricity and smallest clearance, while the lower part has a smallest eccentricity and
large clearance quantity. In consequence, for the upper pump, the compression function is
carried out, but the lower pump idles. On the contrary when the shaft rotates with count
clockwise direction, the lower pump does a compression work and the upper pump idles.
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