A humidifier has a base unit with an engagement face that is configured to interface with a flow generator. The humidifier also has a tank configured to be removably received by the base unit and hold a volume of liquid. The tank has a side wall with an air inlet. The humidifier further has an air f
A humidifier has a base unit with an engagement face that is configured to interface with a flow generator. The humidifier also has a tank configured to be removably received by the base unit and hold a volume of liquid. The tank has a side wall with an air inlet. The humidifier further has an air flow passage configured to receive an air connector of the flow generator at the engagement face of the base unit. The air flow passage is axially offset from a tank inlet. In addition, a cross-section of the airflow passage inlet and a cross-section of the tank air inlet are substantially perpendicular to a horizontal plane.
대표청구항▼
1. A humidifier comprising: a base unit configured to attach to and detach from a flow generator, said base unit comprising: an engagement face adapted to face a corresponding engagement face of the flow generator;a plurality of tongues located on the engagement face that are adapted to move vertica
1. A humidifier comprising: a base unit configured to attach to and detach from a flow generator, said base unit comprising: an engagement face adapted to face a corresponding engagement face of the flow generator;a plurality of tongues located on the engagement face that are adapted to move vertically and adapted to be resiliently urged downward to engage slots of the flow generator;a chamber with an inlet in communication with a circular aperture in the engagement face, both the circular aperture and the chamber inlet being configured to receive an air connector of the flow generator;an electrical connector, for engagement with a mating electrical connector on the flow generator, the electrical connector of the humidifier adapted to provide electrical power to the humidifier from the flow generator;a base surface having a circular aperture therein;a circular pad positioned within the circular aperture of the base surface, the circular pad standing proud of the surrounding base surface and being resiliently biased upwardly through the circular aperture in the base surface;a heating element to heat the circular pad;a pivotable lid having a horizontal wall;a pipe extending from an upper surface of the horizontal wall of the lid and opening into an internal region of the base unit;a lid seal attached to the lid, the lid seal having a sealing flange that extends downwardly from the lid and curves inwardly; anda biased lid catch for securing the lid in a closed position; anda tank adapted to attach to and detach from the base unit; the tank comprising: a cover including a plastic material;a base to receive water therein;a sealing gasket located between the cover and the base;an air inlet passage extending from a side wall of the tank; andan air outlet provided to a roof of the cover,wherein:the tank seats within the base unit so that a bottom of the tank is exposed to contact the circular pad when the tank is engaged with the base unit,one or more liquid filling heights are indicated by filling level graduations marked on a wall of the tank,the air inlet passage extends so that it opens in the interior of the tank at a point beyond, in the direction of air flow, a center of the air outlet,the air inlet passage and the air outlet of the tank are oriented so that gas flows through the air inlet passage in a direction perpendicular to a direction in which the gas flows through the air outlet,a vertical offset is provided between the inlet of the chamber and the air inlet passage of the tank, with at least a portion of the chamber being lower than the air inlet passage in the normal orientation of the humidifier,the chamber is configured so that the pressurized gas flows downward and upward in the chamber prior to entering the tank,the lid seal contacts the tank cover when the tank is received by the base unit and the lid is in the closed position so that the air outlet of the tank sealingly interfaces with the pipe,a first end portion of the pipe passes through the horizontal wall of the lid and has a lower end that projects beyond the horizontal wall of the lid into an interior of the base unit to terminate at a rim so that a passage of the pipe opens into the interior of the base unit,at least a portion of the lid seal surrounds the pipe, andat least a portion of the pipe is at an acute angle to horizontal. 2. The humidifier of claim 1, wherein the tank is configured to be filled via the air outlet. 3. The humidifier of claim 1, wherein in at least two tilted positions of the tank, the air outlet is below the open end of the air inlet passage, such that water will flow through the air outlet before it will flow into the air inlet passage, and wherein in a normal operating position, when the air outlet is above the open end of the air inlet passage, water will not escape via the air inlet passage unless the tank has been over-filled. 4. The humidifier of claim 3, wherein a maximum filling level graduation of the filling level graduations is marked on the wall of the tank, the maximum filling level graduation being lower than a lowest level of the air inlet passage. 5. The humidifier of claim 1, wherein the chamber inlet is provided with a sealing device configured to sealingly receive the air connector of the flow generator. 6. The humidifier of claim 1, wherein an axis of the air inlet passage of the tank and an axis of the chamber inlet configured to receive the air connector of the flow generator are vertically offset. 7. The humidifier of claim 1, wherein a second end portion of the pipe is configured to attach to a hose to supply humidified air to a patient, and wherein the lid seal is formed from an elastomeric material. 8. The humidifier of claim 1, wherein the pivotable lid has a vertical wall extending downward from the horizontal wall. 9. A breathable gas supply apparatus for use in continuous positive airway pressure (CPAP) treatments, the apparatus comprising: a humidifier according to claim 1; anda flow generator that has an engagement face to face the engagement face of the humidifier, the flow generator comprising: an external case of rigid plastic material comprising a top case and a bottom case, a lower edge of the top case being stepped and flanged to mate with a periphery of the bottom case;an air connector projecting away from the engagement face of the flow generator and being in communication with the chamber inlet of the humidifier;a slot configured to receive a data card, the slot being provided in a wall of the external case;an LCD screen visible through the top case by which a user can set operating parameters of the apparatus;a chassis positioned within the case, the chassis including a peripheral wall and a fan cavity;a printed circuit board carrying electronic control components of the breathable gas apparatus, the printed circuit board being positioned in a space formed between the chassis and the top of the top case;an air inlet formed in a wall of the external case;an air inlet passage that communicates with the air inlet and opens to a space at least partly surrounding the fan cavity; andan inlet tube configured to direct air from the space at least partly surrounding the fan cavity to an interior of the fan cavity;a fan mounted in the fan cavity, the fan comprising: a fan housing including a cover and a base;a motor mounted within the fan housing;a coaxial impeller mounted within the fan housing;an air inlet in a floor of the base on an axis of the impeller; andan air outlet, whereincavities in the cover and base of the fan housing form a volute which leads from the impeller to the fan air outlet, andthe fan air outlet is connected to the air connector via a coupling member. 10. A humidifier comprising: a base unit with an engagement face that is configured to interface with a flow generator;a tank configured to be removably engageable with the base unit and hold liquid, the tank having a side wall with an air inlet; anda chamber within the base unit, the chamber comprising an inlet configured to receive an air connector of the flow generator at the engagement face of the base unit and a chamber outlet configured to deliver a flow of gas to the tank air inlet,wherein the inlet of the chamber is axially offset from the tank air inlet,a first portion of the chamber is configured to direct a flow of gas from the flow generator towards the chamber outlet in a first vertical direction,a second portion of the chamber is configured to direct the flow of gas from the flow generator towards the chamber outlet in a second opposing vertical direction prior to entering the tank via the tank air inlet, anda cross-section of the chamber inlet and a cross-section of the tank air inlet are substantially perpendicular to a horizontal plane. 11. The humidifier of claim 10, wherein the chamber inlet is vertically offset from the tank inlet. 12. The humidifier of claim 11, wherein the inlet of the chamber is tubular and extends from a main body of the chamber. 13. The humidifier of claim 11, wherein the chamber outlet is entirely above a lowest portion of the chamber. 14. The humidifier of claim 10, wherein the chamber is provided with a sealing device that sealingly connects to the tank air inlet when the tank is received in the base unit. 15. The humidifier of claim 10, wherein the tank includes a removable cover and a base, and a sealing gasket between the cover and the base; and an outlet is located proximate a roof of the cover. 16. The humidifier of claim 15, wherein the tank outlet and the tank inlet are oriented so that gas enters the tank in a direction perpendicular to a direction in which the gas exits the tank. 17. The humidifier of claim 16, wherein the tank includes only one air inlet and only one air outlet. 18. The humidifier of claim 17, wherein the tank includes an inlet passage extending from the tank air inlet to an interior of the tank at a point beyond, in the direction of air flow, a center of the air outlet. 19. The humidifier of claim 10, wherein, in a tilted position of the tank, an air outlet of the tank is below the tank air inlet, such that liquid will flow through the air outlet before it will flow through the tank air inlet, and wherein when the air outlet is above the tank inlet, liquid will not escape via the tank air inlet unless the tank has been over-filled. 20. The humidifier of claim 10, wherein relative locations of the chamber and the tank air inlet and a shape of the tank cooperate to form a tiered liquid backflow prevention arrangement in which the shape of the tank provides a first level of liquid backflow prevention and the relative locations of the chamber and the tank air inlet provide a second level of liquid back flow prevention. 21. The humidifier of claim 10, further comprising a lid pivotably attached to the base unit, the lid being configured to retain the tank within the base unit. 22. The humidifier of claim 21, wherein the lid comprises a pipe extending above and below the lid, the pipe being adapted to connect to a conduit to supply humidified air to a patient. 23. The humidifier of claim 22, wherein the lid further comprises a lid seal surrounding a portion of the pipe extending below the lid, the lid seal forming a seal around an air outlet of the tank when the tank is received in the base unit and the lid is in a closed position such that the pipe sealingly connects to the air outlet of the tank when the tank is received within the base unit and the lid is in the closed position. 24. A gas supply system comprising: a humidifier according to claim 10; anda flow generator releasably connected to the humidifier, the flow generator comprising:an external case comprising a top case and a bottom case;a chassis formed with a peripheral wall and including a fan cavity; anda fan mounted in the fan cavity and housed by a fan housing;a motor mounted within the fan housing; anda coaxial impeller mounted within the fan housing. 25. A method of humidifying pressurized gas comprising: receiving pressurized gas from ambient or an external source in a chamber positioned at a first position within a base unit of a humidifier, the first position being proximate an engagement face of the base unit that is configured to interface with a flow generator;directing the received pressurized gas from the first position within the base unit to an air inlet passage of a tank at a second position that is axially offset from the chamber at the first position, the tank being contained within the base unit and holding liquid; andexposing the pressurized gas to the liquid in the tank to humidify the pressurized gas,wherein gas flows within the chamber towards the second position in both an upward direction and a downward direction prior to entering the tank. 26. The method of claim 25, wherein the first and second positions are vertically offset from each other. 27. The method of claim 25, further comprising inhibiting the liquid in the tank from reaching the first position when the humidifier is tilted from a normal upright operating orientation. 28. The method of claim 27, wherein the relative locations of the first and second positions and the shape of the tank cooperate to form a tiered liquid back flow prevention arrangement in which the shape of the tank provides a first level of liquid back flow prevention and the relative locations of the first and second positions provide a second level of liquid back flow prevention. 29. The method of claim 25, wherein the tank is retained within the base unit by a lid pivotably attached to the base unit when the lid is in a closed position, and the humidified gas is directed out of the tank through the lid when the lid is in the closed position. 30. The method of claim 29, wherein when the lid is in the closed position and the tank is received within the base unit, the lid engages a top portion of the tank to form a sealed gas passage with the tank, the sealed gas passage conveying humidified gas from within the tank to a location outside of the base unit.
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