Liquid dispensing pump and liquid dispensing device

A liquid dispensing device comprising:

• a liquid dispensing pump comprising:
• a first liquid storage cylinder provided with a first liquid inlet/outlet port;
• a second liquid storage cylinder provided with a second liquid inlet/outlet port;
• a first plunger movably connected to the first liquid storage cylinder, one end of the first plunger being inserted into an inner cavity of the first liquid storage cylinder;
• a second plunger movably connected to the second liquid storage cylinder, one end of the second plunger being inserted into an inner cavity of the second liquid storage cylinder;
• and
• a driving assembly connected to the first plunger and the second plunger;
• a first raw material tank;
• a second raw material tank;
• a mixing tank;
• a first liquid path switcher connected among the first raw material tank, the liquid dispensing pump, and the mixing tank;
• and
• a second liquid path switcher connected among the second raw material tank, the liquid dispensing pump, and the mixing tank,
• wherein, when the driving assembly drives the first plunger and the second plunger to move in a first direction, the first liquid path switcher is configured to selectively enable conduction of the liquid path between the first raw material tank and the liquid dispensing pump and the second liquid path switcher is configured to selectively enable conduction of the liquid path between the second raw material tank and the liquid dispensing pump, so that the liquid dispensing pump sucks raw materials from the first raw material tank into a volume of the first liquid storage cylinder and from the second raw material tank into a volume of the second liquid storage cylinder;
• and
• wherein, when the driving assembly drives the first plunger and the second plunger to move in a second direction opposite to the first direction, the first liquid path switcher is configured to selectively enable conduction of the liquid path between the mixing tank and the liquid dispensing pump and the second liquid path switcher is configured to selectively enable conduction of the liquid path between the mixing tank and the liquid dispensing pump, so that the liquid dispensing pump discharges raw materials into the mixing tank at a preset mixing ratio according to the volume of the first liquid storage cylinder and the volume of the second liquid storage cylinder, and a first water quality sensor is provided between the first raw material tank and the first liquid path switcher.