Heat pump mounting box and heat pump dryer or heat pump washer-dryer

A heat pump dryer or washer-dryer, comprising a heat pump mounting box for the heat pump dryer or washer-dryer, wherein the heat pump mounting box comprises:

• a base provided with an air suction port and a two-device mounting chamber;
• an air passage guide plate mounted to the base and defining, together with the base, an air guide passage that has a drying air inlet in communication with the air suction port and a drying air outlet in communication with the two-device mounting chamber;
• and
• a flock filter mesh assembly for intercepting flock in drying air blown to the two-device mounting chamber, drawably mounted to at least one of the base and the air passage guide plate, and located at the drying air outlet,
• wherein a drawable guide rail is provided to at least one of the air passage guide plate and the base, and the flock filter mesh assembly is slidably fitted in the drawable guide rail, and
• wherein the drawable guide rail comprises a vertical groove segment disposed at an inner edge of the drying air outlet, a horizontal groove segment disposed at an upper edge thereof, and a drawable port disposed at an outer edge thereof.