Diffuser for aeration
Disclosed is a diffuser installation structure capable of improving uniformity of air bubbles discharged from air bubble discharge holes, restricting the formation of dead zone air bubble discharge holes, and having the tolerance against design deviation. In the installation structure for a diffuser including at least one air feeding port and an air bubble discharge wall having a plurality of air bubble discharge holes, the air bubble discharge wall is inclined upward in the direction of increasing distance relative to the air feeding port.
1. An installation structure for a diffuser for aeration comprising at least one air feeding port and an air bubble discharge wall having a plurality of air bubble discharge holes, wherein the plurality of air bubble discharge holes are formed only at an upper portion of the air bubble discharge wall and the air bubble discharge wall is inclined upward in the direction of increasing distance relative to the air feeding port, such that when an air layer is formed above a water layer inside the diffuser, buoyancy applied to the air layer by the water layer can cause the air layer to spontaneously and easily extend to a distal end of the diffuser such that the air layer may have uniform thickness over the whole area of the air bubble discharge wall.
2. The installation structure as claimed in claim 1 , wherein the air bubble discharge wall is inclined upward by a fixed inclination angle in the direction of increasing distance relative to the air feeding port.
3. The installation structure as claimed in claim 2 , wherein the upward-inclination angle of the air bubble discharge wall is in a range of about 3° to about 10°.
4. The installation structure as claimed in claim 2 , wherein the upward-inclination angle of the air bubble discharge wall is set in such a manner that an amount of air bubbles discharged from the air bubble discharge hole which is closest to the air feeding port, is substantially identical to an amount of air bubbles discharged from the air bubble discharge hole located farmost away from the air feeding port.
5. The installation structure as claimed in claim 1 , wherein the air bubble discharge wall is inclined upward with gradually increasing inclination angle in the direction of increasing distance relative to the air feeding port.
6. A diffuser module comprising:
a tube manifold having at least one air intake port and a plurality of air outlet ports which are intermittently formed in an air flow direction; and
a plurality of diffusers which are fluid-communicated with the air outlet ports of the manifold,
wherein each of the diffusers has at least one air feeding port and an air bubble discharge wall having a plurality of air bubble discharge holes only at an upper portion thereof and the air'bubble discharge wall is inclined upward in the direction of increasing distance relative to the air feeding port, such that when an air layer is formed above a water layer inside the diffuser, buoyancy applied to the air layer by the water layer can cause the air layer to spontaneously and easily extend to a distal end of the diffuser such that the air layer may have uniform thickness over the whole area of the air bubble discharge wall.
7. The diffuser module as claimed in claim 6 , wherein the manifold is inclined upward relative to a horizontal plane in the air flow direction.
8. The diffuser module as claimed in claim 7 , wherein an upward-inclination angle of the manifold is in a range of about 0.5° to about 1°.