Portable fan

A portable fan, comprising:

• a handheld portion;
• a housing, connected to the handheld portion and having an air inlet and an air outlet opposite to the air inlet;
• a display screen, arranged on the fan housing or the handheld portion and configured to display a currently airflow speed level and an adjustable airflow speed interval, wherein the portable fan is preset with a plurality of airflow speed levels, for forming the adjustable airflow speed interval;
• and
• an airflow speed regulator, configured to receive a control instruction that is in a continuous state or has a changing trend and configured to perform, through the control instruction, an adjustment of a preset adjustment magnitude on the current airflow speed level within the adjustable airflow speed interval formed by the plurality of airflow speed levels;
• wherein, the adjustment magnitude is positively correlated with a speed at which a user performs an action on the airflow speed regulator or positively correlated with a time length for which a user performs an action on the airflow speed regulator.

A fan, comprising:

• a display screen, configured to display a currently airflow speed level and an adjustable airflow speed interval, wherein the fan is preset with a plurality of airflow speed levels for forming the adjustable airflow speed interval;
• an airflow speed regulator, configured to receive a control instruction that is in a continuous state or has a changing trend and configured to adjust, with a preset adjustment magnitude through the control instruction, a current airflow speed level within the adjustable airflow speed interval formed by the plurality of airflow speed levels;
• wherein, the fan is preset with a plurality of threshold intervals;
• the airflow speed regulator is configured to:
• determine the adjustment magnitude according to a respective one of the plurality of threshold intervals in which an action speed or an action time length falls;
• and adjust the current airflow speed level according to the determined adjustment magnitude;
• wherein, the action speed is a speed at which a user performs an action on the airflow speed regulator, the action time length is a time length for which the user performs the action on the airflow speed regulator;
• the plurality of threshold intervals correspond to different adjustment magnitudes from each other.