Humidifier and heater

A humidifying apparatus for humidifying a breathable gas such as air or oxygen-supplemented air to be inhaled by a patient, comprising:

• (a) a body defining a humidifying chamber, a fluid inlet conduit and a fluid outlet conduit for directing a breathable gas stream into and out of the body, and a liquid collection well;
• (b) a sheet of wicking material centrally suspended within said body, for absorbing a liquid in said well and exposing said liquid to said moving stream of gas as it passes through said body;
• (c) a heat exchange sleeve extending into said collection well, the interior of said sleeve being isolated from the humidifying chamber;
• (d) said body having a liquid inlet pipe extending into said body for selectively permitting liquid to flow into said collection well, and a safety outlet pipe extending into said body for selectively permitting liquid to flow out of said body;
• (e) a pivotally mounted first float valve consisting of a substantially horizontal platform, and a leg portion substantially perpendicular to said platform, said leg portion having an elastomer material mounted thereon such that said material is adjacent the liquid inlet pipe, whereby when fluid in said collection well rises to a first predetermined level said first float valve pivots thereby bringing the elastomer material into contact with the liquid inlet pipe and sealing the mouth of said pipe;
• and
• (f) a pivotally mounted second float valve consisting of a substantially horizontal platform, and a leg portion substantially perpendicular to said platform, said leg portion having an elastomer material mounted thereon such that said material is adjacent the safety outlet pipe and normally seals the adjacent mount portion of the safety outlet pipe except when fluid in said fluid collection well rises to a second predetermined level which is above the first predetermined level, said second float valve pivots thereby bringing the elastomer material out of sealing contact with the adjacent mouth portion of the outlet pipe and permitting fluid to flow out of said humidifying chamber.