Large-capacity dual-tank pet water dispenser and automatic water refilling method therefor

A large-capacity dual-tank pet water dispenser, comprising:

• a circulating water tank, wherein the circulating water tank defines a first water storage chamber having a first upper opening, and a water tray is disposed at the first upper opening and provided with a water outlet hole and a drain hole;
• and a first water pump is disposed at a bottom of the first water storage chamber and integrated with a water shortage sensor, and a water outlet of the first water pump is in fluid communication with the water outlet hole via a first water supply pipe;
• and
• a purified water tank, detachably connected to a side of the circulating water tank, wherein the purified water tank defines a second water storage chamber having a second upper opening, the second upper opening is covered by an upper cover, a second water pump and a control board are disposed inside the upper cover, and the control board is configured to control start and stop of the first water pump and the second water pump;
• a water inlet of the second water pump is connected to a second water supply pipe, and an end of the second water supply pipe away from the second water pump extends to a bottom of the second water storage chamber;
• a side of the upper cover facing the circulating water tank is provided with a water outlet structure, and a water outlet of the second water pump is in fluid communication with the water outlet structure;
• and
• upon receiving a water shortage signal sent by the water shortage sensor, the control board controls the second water pump to start and operate continuously for a first preset duration, such that water stored in the second water storage chamber is delivered to the first water storage chamber sequentially via the second water supply pipe and the water outlet structure;
• wherein a filter cartridge tray is disposed below the water tray, and an overflow channel is formed between the filter cartridge tray and the water tray;
• and a filter cartridge slot is formed in a middle portion of the filter cartridge tray, a filter cartridge is detachably mounted in the filter cartridge slot, a first through hole in fluid communication with the first water storage chamber is formed in a bottom of the filter cartridge slot, a filter cotton is detachably mounted in the first through hole, and a lower end of the filter cotton extends to a lower end inside the first water storage chamber.