Device for measuring flow of rear bearing cavity in APU

The utility model discloses a device for measuring the flow of a rear bearing cavity in an APU. The utility model belongs to the technical field of APU bearing detection and maintenance. An annular check ring which can be coaxially clamped into a rear bearing cavity is mainly adopted; two sealing rings which are matched with the inner side wall of the APU rear bearing cavity to form radial sealingare sequentially formed on the annular check ring in the axial direction of the annular check ring, so that an oil storage space which is communicated with the oil spraying opening and used for collecting and concentrating lubricating oil sprayed out of the oil spraying opening is formed in the periphery of the annular check ring; at the moment, lubricating oil sprayed out of the nozzle can passthrough an inner hole, namely the first flow channel, of the annular check ring without interference to enter the flow meter to be measured, and therefore the problem that the flow of the nozzle in the rear bearing cavity is d