Backpressure mechanism of scroll type compressor

A backpressure mechanism of a scroll type compressor, wherein, an orbiting scroll revolving around a fixed scroll inside a casing of the compressor;

• pressure being gradually and inwardly in multiple compression chambers;
• volume in each compression chamber being altered to compress a coolant;
• a high-pressure chamber being segregated in the upper space in the casing by means of a separation block;
• the compressed coolant entering from a compression chamber at the center of the fixed scroll into the high-pressure chamber;
• a recessed seat being provided on the top of the coolant passage of the fixed scroll;
• a ring groove being disposed on the outer circumference of the recessed seat;
• a floating high-pressure sealing assembly being disposed at the recessed seat, and a floating medium-pressure sealing assembly being provided at the ring groove is characterized by that:
• the high-pressure sealing assembly being comprised of a high-pressure sealing ring, a sealing device and a high-pressure sealing ring seat in the descending order;
• the medium-pressure sealing assembly being comprised of a medium-pressures sealing ring, a sealing device and a medium-pressure sealing ring seat in the descending order;
• a bypass pore connecting through a compression chamber being provided at the ring groove of the fixed scroll;
• both of the high-pressure and the medium-pressure sealing assemblies plunging upwardly against the separation block below the high-pressure chamber;
• and the pressure from the compressed coolant causing the fixed scroll to produce an axially compromising vacuum unloading to upgrade the operation efficiency of the compressor.