Liquid feeding device and cell culture device

A liquid feeder comprising:

• a receptor connected to one end of a feed pipe for feeding a liquid, the receptor receiving the liquid;
• a gas bag connected to the other end of the feed pipe, for holding a gas for suppressing qualitative changes of the liquid;
• a liquid feeding mechanism part for feeding by positioning the liquid between gas from the gas bag at both ends of the liquid to be fed to the receptor by the feed pipe;
• a liquid bag for holding the liquid;
• flow channels connecting the feed pipe to the liquid bag;
• and
• branch points connected to the flow channels connected to the gas bag,
• wherein the liquid feeding mechanism part includes a pump placed in the feed pipe, and a gas introduction valve for introducing the gas of the gas bag to the branch point,
• wherein the branch point is provided above the liquid level of the liquid held in the liquid bag, and
• when the liquid of the flow channels connected to the liquid bag returns to the liquid bag by dropping into the liquid bag, the flow channels leading to the liquid bag are filled with the gas.

A liquid feeder comprising:

• a holding container for holding a liquid;
• a receptor for receiving the liquid;
• a liquid feeding mechanism part which uses a feed pipe to feed the liquid in the holding container to the receptor;
• and
• a gas bag connected to the holding container, for holding the gas for suppressing qualitative changes of the liquid;
• flow channels connecting the feed pipe to the holding container;
• and
• branch points connected to the flow channels connected to the gas bag,
• wherein the liquid feeding mechanism part holds the gas for suppressing qualitative changes of the liquid in a gas phase contacting the liquid in the holding container,
• wherein the liquid feeding mechanism part includes a pump placed in the feed pipe, and a gas introduction valve for introducing the gas from the gas bag to the branch point, and
• when the branch point is provided above the liquid level of the liquid held in the holding container and the liquid in the flow channels connected to the holding container returns to the holding container by dropping into the holding container, the flow channels leading to the holding container are filled with the gas for suppressing the qualitative changes of the liquid.