Humidifier for respirator and respirator

A respirator, comprising a humidifier which comprises:

• a water receiving chamber enclosed by a main body and a bottom plate and divided, by a vertically disposed partition plate, into a gastight liquid reservoir chamber and a heating chamber communicated with exterior environment;
• a passage for communicating the liquid reservoir chamber and the heating chamber;
• and
• a baffle located in the heating chamber and extending toward the bottom plate from a top wall of the main body,
• wherein there is a gap between the baffle and a circumferential sidewall of the heating chamber, a backflow tank is collectively formed by a circumferential sidewall of the baffle, the partition plate and the top wall,
• wherein the baffle comprises a first cylindrical portion and a second cylindrical portion connected with a circumferential outer sidewall of the first cylindrical portion, the first cylindrical portion forms a gas outlet chamber, and the second cylindrical portion forms a gas inlet chamber which is in communication with the gas outlet chamber.