中心管

中心管是螺旋卷式反渗透（RO）膜元件中的关键结构部件，通常由高强度聚合物或复合材料制成。它作为核心支撑结构，膜片围绕其缠绕，同时包含渗透液收集通道，用于汇集从膜表面净化的水。管上设有精密加工的孔或槽，允许渗透液流入中心收集通道，同时在高操作压力（高达1000 psi（69 bar））下保持结构完整性。

中心管既充当结构骨架，又充当流体管理系统。在RO操作过程中，给水在压力下沿膜表面切向流动，而净化水（渗透液）通过膜，并通过渗透液载体材料螺旋流向中心管。渗透液通过精确间隔的孔进入管中，在中心通道中汇集，并通过端盖流出。管的结构设计防止在压差下坍塌，同时保持膜层的精确对齐。

The central tube functions as both a structural backbone and fluid management system. During RO operation, feed water flows tangentially across membrane surfaces under pressure, while purified water (permeate) passes through the membrane and flows spirally toward the central tube through permeate carrier material. The permeate enters the tube through precisely spaced perforations, collects in the central channel, and exits through end caps. The tube's structural design prevents collapse under pressure differentials while maintaining precise alignment of membrane layers.