The application provides a compressor liquid knock test device and a method for determining the
refrigerant filling amount of a compressor liquid knock test, and relates to the technical field of compressor detection. The device comprises a compressor, a liquid accumulator, a
data acquisition device, a computer and a
strain gauge. The
strain gauge is installed on a
cross slip ring in the compressor. An
exhaust pipe and an air suction
pipe are arranged above and below the compressor. The
exhaust pipe is connected to the inlet of the liquid accumulator through a first pipeline. The air suction
pipe is connected to the outlet of the liquid accumulator through a second pipeline. An inlet stop valve is arranged on the first pipeline. An outlet stop valve and an air suction pressure gauge are arranged on the second pipeline. The method comprises
cross slip ring stress analysis, determination of the
strain gauge sticking position, test device design,
cross slip ring strain test and determination of the
refrigerant filling amount of the compressor liquid knock test. The application sticks a strain gauge on the cross
slip ring, tests the cross
slip ring strain of the compressor liquid knock test under different
refrigerant filling amounts, and finally determines the refrigerant filling amount of the compressor liquid knock test.