JPS5519923A - Screw compressor - Google Patents

Abstract

PURPOSE: To facilitate controls of inhaled draft amount in such a way of either forming a partition bulkhead within specific range of rotational angle θ of rotors or removing it for increasing or decreasing the size of an inlet port.

CONSTITUTION: An inlet port 4 and a discharge port 5 to rotors 2A, 2B are provided on the bulkhead part of the main body composed of a casing 1 and a cover 3 combined to each other. Peripheries of the rotors 2A, 2B are opened by approximately 3/4 respectively, and approximately 1/4 of the rest constitutes a partition bulkhead 6. The reference of the rotational angle θ of the rotors is put on the vertical line passing across the centers of the rotors, namely which is put along with the inlet port 4 at the border with the partition bulkhead. In consequence, at the same time as the rotors start up rotation in the direction of θ, gas is compressed. Now, in case where the one with a little smaller capacity is to be made, if the partition bulkhead 6 is removed, because the compression starts up after the rotors have made rotation to a certain angle, the volume V is lessened. In this case, it will suffice with replacing the cover rigged with the partition bulkhead 6 by the cover without it.

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