Liquid transfer device

A liquid transfer device, comprising:

• a first housing;
• a second housing;
• and
• a liquid extraction assembly;
• wherein the first housing comprises a first sidewall, a first top wall, and an extrusion portion, the first sidewall is connected to the first top wall, the first sidewall and the first top wall cooperatively define a first receiving cavity, the extrusion portion is disposed on the first top wall and received in the first receiving cavity, the second housing comprises a second sidewall and a second top wall, the second sidewall is connected to the second top wall, the second sidewall and the second top wall cooperatively define a second receiving cavity, the first housing is received in the second receiving cavity;
• wherein the liquid extraction assembly comprises a liquid extraction pipe and a liquid extraction head connected to the liquid extraction pipe, the liquid extraction pipe is disposed between the first top wall and the second top wall and corresponds to the extrusion portion, the liquid extraction head extends out of the second top wall, the extrusion portion is configured to squeeze the liquid extraction pipe, the first housing is configured to move back and forth along a central axis of the second receiving cavity to drive the extrusion portion to move back and forth along the central axis relative to the extraction pipe, thereby causing the liquid extraction pipe to be compressed and rebounded to release or intake liquid.