Drain pump and washing machine having the same

A washing machine comprising:

• a cabinet;
• a tub;
• and
• a drain pump that pumps washing water in the tub,
• wherein the drain pump comprises:
• a pump case including a washing water inflow chamber and a drain pump chamber;
• and
• a pump filter that filters foreign substances in the washing water flowing from the tub into the pump case and is detachable from the pump case,
• wherein the pump filter comprises:
• a pump filter body insertable into the pump case;
• and
• a pump filter head including
• a first head combinable with a front of the pump filter body at a first side of the first head, combinable with the pump case at the first side of the first head, and rotatable in one of a clockwise direction and a counterclockwise direction, and
• a second head positioned at a second side of the first head opposite the first side of the first head and rotatable separately from the first head in at least one of the clockwise direction and the counterclockwise direction while the first head is in a state in which the first head is combined with the pump case, thereby generating a sound indicating the pump filter body is normally combined with the pump case.

A drain pump comprising:

• a pump case in which washing water is accommodated;
• and
• a pump filter that filters foreign substances in the washing water in the pump case and includes a body and a pump filter head that are detachable from the pump case,
• wherein the pump filter head comprises:
• a first head combinable with the pump case at a first side of the first head and rotatable in one of a clockwise direction and a counterclockwise direction;
• and
• a second head that is combined with a second side of the first head opposite the first side of the first head and is additionally rotatable from the first head in at least one of the clockwise direction and the counterclockwise direction after the first head is combined with the pump case,
• wherein an auditory or tactile change is generated in the pump filter head due to separate rotation of the second head with respect to the first head.