| 摘要 |
<p>PCT No. PCT/GB94/02195 Sec. 371 Date Apr. 5, 1996 Sec. 102(e) Date Apr. 5, 1996 PCT Filed Oct. 7, 1994 PCT Pub. No. WO95/09819 PCT Pub. Date Apr. 13, 1995A fluid diffuser includes an inner extruded tube and an outer extruded tube between which there is a woven fabric material tube. The diffuser includes pores formed by a non-ablative piercing process and being arranged to act as valves which are self-closing when fluid is not flowing through the diffuser. The woven fabric material is arranged to restrain diametral expansion of the inner and outer tubes and thereby restrain an increase in pore size as the pressure of fluid flowing through pores is increased. Thus, if the diffuser is used for diffusing air into water, the size of bubbles produced remains substantially constant as the pressure of air supplied to the diffuser is increased. Other diffusers are described which function in a similar manner, including a disc diffuser and tubular diffusers which are made of sheet material.</p> |
