Constant temperature device for verification/calibration of outflow cup type viscometer

The utility model belongs to the field of measurement and metering science, and particularly relates to a constant-temperature device for verification/calibration of an outflow cup type viscometer, which comprises a constant-temperature water tank and a constant-temperature tank, the constant-temperature tank is of a barrel-shaped structure without a mouth and comprises an inner shell and an outer shell, the inner shell is arranged to be in a shape matched with that of the outflow cup type viscometer, and the outer shell is arranged to be in a shape matched with that of the outflow cup type viscometer. The inner shell and the outer shell form a closed cavity; a constant-temperature tank water inlet hole and a constant-temperature tank water outlet hole are formed in an outer shell of the constant-temperature tank, the constant-temperature tank water inlet hole is connected with a constant-temperature water tank water outlet hole through a pipeline, a water pump is arranged on the pipeline, and the constant-te