The invention discloses an ink supply
structure based on a direct-liquid type
relay core structure, a pen and an
assembly method. The ink supply structure comprises a pen point, a
relay core, an adjuster, a pen holder ink bin and an ink bag. One end of the
relay core is communicated with the ink bag and is in contact with ink in the ink bag, and the other end of the relay core is communicated with the pen point; the
regulator is sleeved with the pen point, and the relay core is arranged in the
regulator in a penetrating mode and connected with the pen point. The pen point, the adjuster and the relay core are all installed in the pen holder ink bin. The
regulator comprises coaxial stepped functional zones, namely an ink inlet zone and a pressure stabilizing zone, which are sequentially arranged along the flowing direction of ink, regulating sheets are arranged in the ink inlet zone and the pressure stabilizing zone, the distance between the regulating sheets is gradually increased from the ink inlet zone to the ink guide zone, and the regulating sheets are provided with gas-liquid exchange channels. The problems that an existing ink supply structure cannot dynamically adjust the ink supply amount and ink discharging is not smooth are solved.