One-stage throttling incomplete-inter-cooling double-working-condition refrigerating system

The invention discloses a one-stage throttling incomplete-inter-cooling double-working-condition refrigerating system capable of achieving variable-flow single-stage vapor compression cycle and variable-flow one-stage throttling incomplete inter-cooling. The one-stage throttling incomplete-inter-cooling double-working-condition refrigerating system comprises a plurality of sets of variable-flow compression condensing units which are connected among a high-temperature air suction pipeline, a low-temperature air suction pipeline and a high-pressure liquid supply pipeline in parallel. Each set of variable-flow compression condensing unit is composed of a low-pressure constant-flow compressor, a low-pressure variable-flow compressor, a high-pressure variable-flow compressor, a first one-way valve, a second one-way valve, a third one-way valve, a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a condenser, an intercooler and a throttling valve. Through opening or closing of each valve, air can be sucked by the high-temperature air suction pipeline so that single-stage compression refrigeration cycle can supply liquid to the high-pressure liquid supply pipeline, and air can also be sucked by the low-temperature air suction pipeline so that double-stage compression refrigeration cycle can supply liquid to the high-pressure liquid supply pipeline.