Suction Accumulator, Function, Application Scenario & Capacity Selection

Suction Accumulator, Function, Application Scenario & Capacity Selection

Suction accumulator is mounted on suction pipe before compressor; it intercepts liquid refrigerant and only lets gaseous refrigerant enter compressor. Liquid refrigerant entering compressor causes liquid slugging, washes away lubricating oil on cylinder wall, leading to rapid compressor damage. It is mandatory for blast freezer, hot gas defrost system and systems with large load fluctuation. Internal structure: baffle, oil return small hole; gas passes upward, liquid settles at bottom, oil slowly returns to compressor through tiny orifice. Xiteliduo blast freezer rack is equipped with suction accumulator as standard configuration. Medium temperature stable load cold room may omit accumulator if expansion valve superheat control is precise. Accumulator volume selection: match maximum possible liquid flood-back volume; too small cannot buffer liquid surge during defrost switching. Oil return hole blockage is common fault; oil accumulates inside tank, compressor oil level drops gradually. Accumulator outer surface frosting is normal under low temperature working condition; insulation can reduce heat absorption. Refrigeration maintenance & repair company checks oil return by monitoring compressor crankcase oil level before and after defrost cycle.

FAQ

1. What is the core purpose of suction accumulator? Prevent liquid refrigerant from entering compressor.
2. Which system must be equipped with suction accumulator? Blast freezer and hot gas defrost rack system.
3. What disaster will liquid slugging cause? Cylinder lubricating oil washed out, compressor damage.
4. How does oil return from accumulator? Through preset small oil return orifice at bottom.
5. What fault if oil return hole blocked? Oil accumulates in accumulator, compressor oil shortage.
6. Can stable medium temp cold room omit accumulator? Possible if superheat control is accurate.
7. Is frosting on accumulator shell normal? Yes, it works under low suction temperature.
8. What decides accumulator sizing? Maximum liquid flood-back volume during defrost switching.