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A membrane humidifier includes buffering and spacing structures each interposed between adjacent hollow fiber membranes of a plurality of hollow fiber membranes arranged in a housing of the membrane humidifier, wherein the buffering and spacing structures buffer a pressure of air supplied from an ai

A membrane humidifier includes buffering and spacing structures each interposed between adjacent hollow fiber membranes of a plurality of hollow fiber membranes arranged in a housing of the membrane humidifier, wherein the buffering and spacing structures buffer a pressure of air supplied from an air blower and maintain a spacing between the adjacent hollow fiber membranes.

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1. A membrane humidifier comprising: buffering and spacing structures each interposed between adjacent hollow fiber membranes of a plurality of hollow fiber membranes arranged in a housing of the membrane humidifier,wherein the buffering and spacing structures are arranged such that a largest number

1. A membrane humidifier comprising: buffering and spacing structures each interposed between adjacent hollow fiber membranes of a plurality of hollow fiber membranes arranged in a housing of the membrane humidifier,wherein the buffering and spacing structures are arranged such that a largest number of buffering and spacing structures is arranged at a central side, and a gradually reduced number of buffering and spacing structures is arranged toward a peripheral side, andwherein the buffering and spacing structures buffer a pressure of air supplied from an air blower and maintain a spacing to form a flow channel for humid air between the adjacent hollow fiber membranes. 2. The membrane humidifier of claim 1, wherein the buffering and spacing structures comprise a hydrophilic material. 3. The membrane humidifier of claim 1, wherein the buffering and spacing structures have a greater diameter than the hollow fiber membranes, and have a length equal to a length of the hollow fiber membranes. 4. The membrane humidifier of claim 1, wherein the buffering and spacing structures have a shape selected from the group comprising a straight shape, a zig-zag shape, a protrusion/groove shape, a coil spring shape, a crimp shape, and a mesh roll shape. 5. The membrane humidifier of claim 1, wherein opposite ends of the buffering and spacing structures are potted together with opposite ends of the hollow fiber membranes, using a potting material. 6. The membrane humidifier of claim 1, wherein humid air guide holes are formed at each of the buffering and spacing structures in a radial direction of the buffering and spacing structure. 7. The membrane humidifier of claim 1, wherein humid air grooves are formed at each of the buffering and spacing structures in a radial direction of the buffering and spacing structure.