WO2011050608A1 - 一种卷式反渗透膜元件 - Google Patents

一种卷式反渗透膜元件 Download PDF

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Publication number
WO2011050608A1
WO2011050608A1 PCT/CN2010/072738 CN2010072738W WO2011050608A1 WO 2011050608 A1 WO2011050608 A1 WO 2011050608A1 CN 2010072738 W CN2010072738 W CN 2010072738W WO 2011050608 A1 WO2011050608 A1 WO 2011050608A1
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WO
WIPO (PCT)
Prior art keywords
water
reverse osmosis
osmosis membrane
inlet
pipe
Prior art date
Application number
PCT/CN2010/072738
Other languages
English (en)
French (fr)
Inventor
侯贻直
Original Assignee
艾欧史密斯（上海）水处理产品有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN2009102017398A external-priority patent/CN101708433B/zh
Priority claimed from CN2010101545074A external-priority patent/CN101838033B/zh
Priority to BR112012011481A priority Critical patent/BR112012011481A2/pt
Priority to KR1020117006005A priority patent/KR101302800B1/ko
Priority to MX2012005007A priority patent/MX2012005007A/es
Priority to ES10825971.4T priority patent/ES2694508T3/es
Application filed by 艾欧史密斯（上海）水处理产品有限公司 filed Critical 艾欧史密斯（上海）水处理产品有限公司
Priority to US13/062,950 priority patent/US8337698B2/en
Priority to BR112012009011-9A priority patent/BR112012009011B1/pt
Priority to PL10825971T priority patent/PL2495034T3/pl
Priority to EP10825971.4A priority patent/EP2495034B1/en
Priority to AU2010312156A priority patent/AU2010312156B2/en
Priority to JP2012535593A priority patent/JP2013509285A/ja
Publication of WO2011050608A1 publication Critical patent/WO2011050608A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/10—Spiral-wound membrane modules
    • B01D63/107—Specific properties of the central tube or the permeate channel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/08—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/10—Spiral-wound membrane modules
    • B01D63/103—Details relating to membrane envelopes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/003—Membrane bonding or sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/04—Specific sealing means
    • B01D2313/041—Gaskets or O-rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/08—Flow guidance means within the module or the apparatus

Definitions

  • the invention belongs to the technical field of water purification treatment, and relates to a reverse osmosis membrane element for removing impurities such as sediment, sludge, colloid, microorganism, virus, organic matter and inorganic salt in water, and particularly relates to a roll type reverse osmosis membrane element.
  • a known roll-type reverse osmosis membrane element is formed by winding a water purification membrane group formed by superposing a pure water flow guiding net, a reverse osmosis membrane and an inlet water guiding net on a water pipe of a book center, wherein a reverse osmosis membrane is formed.
  • the sheet is folded, the inflow diversion net is located in the inflow channel formed between the folded inner surfaces of the reverse osmosis membrane, and the pure water diversion net is located between the folded outer surfaces of the reverse osmosis membrane
  • the roll-type reverse osmosis membrane element is a glue which adheres the side edges of the end faces of the water-producing flow passage and the side away from the central water-producing water pipe so that the water-producing flow passage has an opening facing the center water-producing water pipe, the water-repellent film After the sheet group is wound around the center water pipe, the entire outer surface is wrapped and sealed with an outer tape.
  • the roll-type reverse osmosis element of this structure flows into the water flow channel from one end surface of the element, and a part of water is filtered through the reverse osmosis membrane to form pure water flowing into the central water production pipe along the pure water flow guiding net, leaving no
  • the concentrated water formed by the filtration flows out from the other end surface of the element along the inflow water guiding net in the water inlet flow path.
  • the direction of the water inflow of the reverse osmosis membrane element is consistent with the direction in which the concentrated water is discharged. However, due to the wide flow path, the flow is short, the velocity of the influent water in the flow channel is slow, and the surface of the membrane is prone to concentration polarization.
  • the membrane element is contaminated, so that the salt rejection rate and the water production amount are lowered, and the membrane element life is shortened. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a roll type reverse osmosis membrane element for alleviating the concentration polarization phenomenon of the surface of the existing roll type membrane element, and overcoming the contamination of the membrane element. Problem, extend the life of the membrane element.
  • a roll-type reverse osmosis membrane element is formed by winding at least one set of water purification membranes composed of a pure water flow guiding net, a reverse osmosis membrane and an inlet water guiding net on a central water producing pipe, the reverse osmosis membrane
  • the folded inner surface forms an inflow channel, and a water producing flow channel is formed between adjacent outer surfaces, the influent diversion net is located in the influent channel, and the pure water diversion net is located in the product water channel, the water producing channel only having a pure water outlet facing the center water production pipe, and the other three side closure seals, wherein: the two sides of the inlet flow passage adjacent to the hemming edge are closed and sealed from the central section of the water pipe, so that the two A small section of the raw water inlet is formed at the side near the central water production pipe, and a side of the inlet flow channel opposite to the folded edge forms a concentrated water outlet.
  • the partial seal of the water inlet passage adjacent to the hemming edge away from the central water production pipe is closed and sealed by the glue before the water purification membrane group is wound around the central water production pipe.
  • the portion of the section away from the central water producing pipe is bonded.
  • the two sides of the inlet flow passage adjacent to the hem are closed and sealed.
  • the outer surface of the both ends of the roll-type reverse osmosis membrane element may be sealed by a ring end cover after the water purification membrane group is wound around the central water production tube. Blocking, there is a gap between the central production pipe and the end cover.
  • the length of the raw water inlet occupies the length of the two sides of the inlet flow channel adjacent to the folded edge
  • the water purification membrane set has two groups.
  • a part of the inlet flow passage adjacent to the hemming edge is closed and sealed away from the central water production pipe, so that the two sides form a small section of the raw water inlet and the inlet water flow respectively near the central water production pipe.
  • the side of the road opposite the flange forms a concentrated water outlet.
  • the reverse osmosis membrane element of such a structure enters the inflow passage from the raw water inlet of the inlet passage on both sides of the end face of the element, and a part of the water is filtered through the reverse osmosis membrane to obtain pure water into the production water channel and enter the center along the pure water diversion network.
  • the water pipe forms pure water, and the other part of the concentrated water which is not filtered is discharged in the inflow channel along the inflow water guiding net from the inflow channel and the hemming edge to the concentrated water outlet, even from the water purification membrane group
  • the winding direction is discharged from the lateral circumferential surface of the membrane element, unlike the reverse osmosis membrane element of the prior art, the raw water is rolled from the coil One end surface of the reverse osmosis membrane element flows in, and concentrated water flows out from the other end surface of the membrane element.
  • the reverse osmosis membrane element of the present invention increases the water flow velocity on the surface of the membrane, reduces the concentration polarization of the membrane surface, and reduces the contamination speed of the wound membrane element, thereby prolonging the service life of the membrane element.
  • the raw water inlet An inlet pipe is provided, and the inlet pipe has a plurality of small holes facing the concentrated water outlet.
  • the nozzle of the inlet pipe and the side of the inlet passage adjacent to the flange are flush. This structure makes the water flow smoother.
  • the reverse osmosis membrane is folded to form two layers of water inlet channels and water producing channels, and each of the inlet water channels has a raw water inlet at both ends, and each of the raw water flows into the water.
  • FIG. 1 is a schematic view showing the unfolded structure of the roll-type reverse osmosis membrane element of Embodiment 1 before being wound;
  • Fig. 2 is a schematic view showing the winding reverse osmosis membrane element of the first embodiment after winding;
  • Fig. 3 is a schematic view showing another structure of the inlet water passage for forming a raw water inlet in the second embodiment.
  • Figure 4 is a schematic view showing the structure of the original roll-type reverse osmosis membrane of Example 3. detailed description
  • the roll-type reverse osmosis membrane element 10 of the present embodiment comprises two sets of water purification membrane groups 11 composed of a pure water flow guiding net 100, a reverse osmosis membrane 200, and an inlet water guiding net 300 ( Two sets of this embodiment are wound around the central water producing pipe 400.
  • the reverse osmosis membrane 200 forms an influent channel 210 through the folded inner surface, and a water producing channel 220 is formed between adjacent outer surfaces (the lower outer surface of the reverse osmosis membrane of the bottom layer of the water purification membrane group and the purified water of the top layer)
  • the upper outer surface of the reverse osmosis membrane of the membrane group also forms a water production channel after winding, the inlet water guiding net 300 is located in the water inlet channel 210, and the pure water guiding network 100 is located in the water producing channel 220, the water producing stream
  • the track 220 has only the pure water outlet 221 facing the central water producing pipe 400, and the other three sides 212, 21 3, 214 are closed and sealed by the glue 500, and the two sides 212 of the inlet flow passage 21 adjacent to the flange 211 are provided.
  • the two sides of the inlet flow passage 210 adjacent to the flange 211 are closed.
  • the sealing portion is closed as shown in FIG. 1 , and the water purification membrane group 11 is wound around the center.
  • a portion of the section away from the central production water pipe 400 is bonded with glue 500, leaving a small opening near the central water production pipe 400 to form a raw water inlet 214.
  • the outer end surface of the roll-type reverse osmosis membrane element is closed with a ring end cover 600 (the end cover is coated with glue).
  • a gap is formed between the central production water pipe 400 and the end cover 600 to form a raw water inlet 214.
  • the inlet passage length L (i.e., the length of the raw water inlet 214) is preferably 1 / 4 ⁇ 1 / 3 of the length of the sides adjacent to the flange (i.e., the length of the diaphragm).
  • the two sides 212, 21 3 of the inlet flow passage 21 that are adjacent to the flange 211 are closed and sealed from the partial section of the central water production pipe 400, so that the two sides 212. 21 3 are close to the center.
  • a small section of the raw water inlet 214 is formed at each of the water pipes 400, and a concentrated water outlet 215 is formed at the side of the inlet passage 210 opposite to the hem 211.
  • the roll-type reverse osmosis membrane element of such a structure (as shown in Fig.
  • the raw water inlet 214 of the inflow passage 21 Q enters the inflow passage 21 Q, and a part of the water is filtered through the reverse osmosis membrane 200 to obtain pure water into the production water passage 220, and enters the central production water pipe 400 along the pure water diversion net 100.
  • Another portion of the concentrated water formed by the filtration is discharged from the influent flow channel 210 along the inflow water guiding channel 300 in the influent flow channel 210 with respect to the hemming relative to the concentrated water outlet 215, that is, along the water purification membrane group
  • the winding direction of 10 is discharged from the lateral circumferential surface of the roll-type reverse osmosis membrane element 10, unlike the prior art roll-type reverse osmosis membrane element, the raw water flows in from the end surface of the roll-type reverse osmosis membrane element, concentrated water It flows out from the other end surface of the membrane element.
  • the difference between the embodiment and the embodiment 1 is that the two sides of the inlet flow channel 210 adjacent to the flange 211 are different.
  • the outer end surfaces 12, 13 of the roll-type reverse osmosis membrane element are blocked by the annular end cover 600 (the end cover is coated with glue).
  • a gap is formed between the central production water pipe 400 and the end cover 600 to form a raw water inlet 214.
  • the other structure is the same as that of Embodiment 1, and the advantage of such a sealing method is that it is easier to assemble the film original.
  • the difference between the embodiment and the first embodiment and the second embodiment is that, in order to realize the roll reverse osmosis membrane original, the water inlet dead angle of the raw water inlet can be eliminated, and the raw water inlet fouling is prevented to affect the water quality.
  • An inlet pipe 800 is provided in the raw water inlet 214.
  • the inlet pipe 800 extends from the raw water inlet 214 of one end of the membrane element to the raw water inlet 214 at the other end of the membrane element, and the inlet pipe 800 has a plurality of surfaces facing the concentrated water. A small hole of the nozzle 215 (not shown).
  • the influent water first flows into the inlet pipe 800, and then the influent water is injected into the water inlet pipe 300 from the small hole of the inlet pipe 800 toward the concentrated water outlet 215, so that the water inlet is uniform, and there is no water ingress angle. This avoids scaling.
  • the reverse osmosis membrane 200 is folded to form two layers of the water inlet passage 210 and the product water passage 220, and each of the inlet water passages 210 has a raw water inlet 214 at both ends thereof.
  • the concentrated water outlet 215 is provided with an inlet pipe 800 in each raw water inlet 214, and the nozzle of the inlet pipe 800 is flush with the sides 212, 213 of the inlet runner 210. This structure makes the water flow smoother.
  • the reverse osmosis membrane element of the present invention increases the water flow velocity on the surface of the membrane and reduces the concentration polarization of the membrane surface. The rate of contamination of the wound membrane element is reduced, thereby extending the life of the membrane element.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Nanotechnology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Description

技术领域
本发明属于净水处理技术领域，涉及去除水中泥沙、淤泥、胶体、 微生物、 病毒、 有机物和无机盐等杂质的反渗透膜元件， 尤其涉及一 种卷式反渗透膜元件。
说
背景技术
目前，公知的卷式反渗透膜元件是将由纯水导流网、反渗透膜片、 进水导流网叠加构成的净水膜片组缠绕在书中心产水管上形成，其中对 反渗透膜片进行折叠，所述进水导流网位于反渗透膜片折叠后的内表 面之间构成的进水流道中，所述纯水导流网位于反渗透膜片折叠后的 外表面之间构成的产水流道中，这种卷式反渗透膜元件是将产水流道 的端面两侧边和远离中心产水管的一侧边用胶水粘合使产水流道具 有面向中心产水管的开口， 净水膜片组在缠绕中心产水管后， 整个外 表面用外胶带进行包裹密封。 这种结构的卷式反渗透元件， 其从元件 的一端面的流入进水流道中，一部分水经反渗透膜片过滤形成纯水沿 着纯水导流网流进中心产水管内，剩下未过滤形成的浓水沿着进水流 道中的进水导流网从元件的另一端面流出。这种反渗透膜元件的进水 方向和浓水排出的方向是一致的， 但由于流道宽， 流程短， 进水在流 道中的速度较慢， 膜表面容易产生浓差极化现象，从而导致膜元件污 染， 使得脱盐率和产水量降低， 膜元件寿命缩短。 发明内容
本发明所要解决的技术问题是提供一种卷式反渗透膜元件，用以 减緩现有卷式膜元件膜表面易产生浓差极化现象，克服膜元件污染问 题， 延长膜元件的使用寿命。
为了解决上述技术问题， 本发明采用如下技术方案：
一种卷式反渗透膜元件， 由纯水导流网、反渗透膜片、 进水导流 网叠加构成的至少一组净水膜片组缠绕在中心产水管上形成，所述反 渗透膜片经折叠内表面形成进水流道， 相邻外表面之间形成产水流 道， 所述进水导流网位于进水流道中， 纯水导流网位于产水流道中， 所述产水流道仅具有面向中心产水管的纯水出水口，其它三侧边闭合 密封， 其特征在于： 所述进水流道的与折边相邻的两侧边远离中心产 水管的部分区段闭合密封，使该两侧边接近中心产水管处分别形成小 段原水进水口以及使进水流道的与折边相对的侧边形成浓水出水口。
在本发明的具体实施方式中，所述进水流道的与折边相邻的两侧 边远离中心产水管的部分区段闭合密封是在净水膜片组缠绕在中心 产水管之前用胶水将该远离中心产水管的部分区段粘合。
所述进水流道的与折边相邻的两侧边部分闭合密封也可以在净 水膜片组缠绕在中心产水管之后用环形端盖将所述卷式反渗透膜元 件两端面外部区域封堵， 使中心产水管和端盖之间具有间隙。
所述原水进水口长度占进水流道的与折边相邻的两侧边长度的
1 /4 ~ 1 / 3。
在本发明的优选实施例中， 所述净水膜片组有两组。
采用上述技术方案，将进水流道的与折边相邻的两侧边远离中心 产水管的部分区段闭合密封，使该两侧边接近中心产水管处分别形成 小段原水进水口以及使进水流道的与折边相对的侧边形成浓水出水 口。这样结构的反渗透膜元件是从元件的端面两侧的进水流道的原水 进水口进入进水流道中，一部分水经反渗透膜过滤得到纯水进入产水 流道中沿纯水导流网进入中心产水管形成纯水，另一部分未经过滤形 成的浓水在进水流道中沿着进水导流网从进水流道的与折边相对浓 水出水口排出，也即使从沿着净水膜片组的缠绕方向从膜元件的侧向 的圓周表面排出， 而不像现有技术的反渗透膜元件那样，原水从卷式 反渗透膜元件的一端面流进， 浓水从膜元件的另一端面流出。 经过这 样的改进， 本发明的反渗透膜元件加大了膜表面水流速度， 减小膜表 面浓差极化， 降低卷式膜元件的污染速度， 从而延长了膜元件的使用 寿命。
在本发明的进一步改进中，为了实现卷式反渗透膜原件能够消除 原水进水口的进水死角， 避免原水进水口结垢而影响水质， 在本发明 的进一步改进中， 所述原水进水口中设有进水管， 所述进水管上具有 多个面向浓水出水口的小孔。
在本发明的优选实施方式中所述进水管的管口和所述进水流道 的与折边相邻的侧边齐平。 这样结构， 使得进水更加顺畅。
在本发明的具体实施方式中，所述反渗透膜片经折叠形成两层进 水流道和产水流道， 所述每层进水流道两端都具有原水进水口，所述 每个原水进水口中均设有进水管。 附图说明
下面结合附图和本发明具体实施方式对本发明进行详细说明： 图 1为实施例 1的卷式反渗透膜元件未缠绕之前的展开结构示意 图；
图 2为实施例 1的卷式反渗透膜元件缠绕后的示意图； 图 3为实施例 2中的另一种封堵进水流道形成原水进水口的结构 示意图。
图 4为实施例 3的卷式反渗透膜原件的结构示意图。 具体实施方式
实施例 1
如图 1所示， 本实施例的卷式反渗透膜元件 10 , 由纯水导流网 100、 反渗透膜片 200、 进水导流网 300叠加构成的两组净水膜片组 11 (本具体实施方式中有两组）缠绕在中心产水管 400上形成。 其中， 反渗透膜片 200经折叠内表面形成进水流道 210 , 相邻外 表面之间形成产水流道 220 (底层的净水膜片组的反渗透膜片的下外 表面和顶层的净水膜片组的反渗透膜片的上外表面在缠绕后也形成 产水流道）， 进水导流网 300位于进水流道 210中， 纯水导流网 100 位于产水流道 220中，产水流道 220仅具有面向中心产水管 400的纯 水出水口 221 , 其它三侧边 212、 21 3、 214用胶水 500闭合密封， 而 进水流道 21 0的与折边 211相邻的两侧边 212、 21 3远离中心产水管 400的部分区段闭合密封， 使该两侧边 212. 21 3接近中心产水管 400 处分别形成小段原水进水口 214以及在进水流道 210的与折边 211相 对的侧边形成浓水出水口 215。
将进水流道 210的与折边 211相邻的两侧边 212. 21 3远离中心产 水管 400的部分区段闭合密封， 密封方式如图 1所示， 在净水膜片组 11缠绕在中心产水管 400之前用胶水 500将该远离中心产水管 400 的部分区段粘合起来， 在接近中心产水管 400处留下一小段开口， 形 成原水进水口 214。 如图 3所示， 在净水膜片组 11缠绕在中心产水 管 400之后用环形端盖 600 (端盖内涂有胶水）将卷式反渗透膜元件 两端面 12. 1 3外部区域封堵，使中心产水管 400和端盖 600之间具有 间隙， 形成原水进水口 214。
由于 V=Q/ ( L T ), ( V为水流速度， Q为进水流量， ！^为进水流 道长度， 即原水进水口 214长度， T为流道厚度）， 当进水流量 Q — 定， ！^减小时， 进水流速增大， 从而膜表面流速增大。 实验值证明进 水流道长度 L (即原水进水口 214长度）为与折边相邻的两侧边长度 (即膜片长度） 的 1 /4 ~ 1 / 3为最佳。
采用上述技术方案，将进水流道 21 0的与折边 211相邻的两侧边 212、 21 3 远离中心产水管 400 的部分区段闭合密封， 使该两侧边 212. 21 3接近中心产水管 400处分别形成小段原水进水口 214以及在 进水流道 210的与折边 211相对的侧边形成浓水出水口 215。 这样结 构的卷式反渗透膜元件（如图 2所示）是从元件的端面 12、 1 3两侧 的进水流道 21 Q的原水进水口 214进入进水流道 21 Q中，一部分水经 反渗透膜片 200过滤得到纯水进入产水流道 220中沿纯水导流网 100 进入中心产水管 400 , 另一部分未经过滤形成的浓水在进水流道 210 中沿着进水导流网 300从进水流道 210的与折边相对浓水出水口 215 排出， 也即是沿着净水膜片组 10的缠绕方向从卷式反渗透膜元件 10 的侧向圓周表面排出， 而不像现有技术的卷式反渗透膜元件那样， 原 水从卷式反渗透膜元件的一端面流进， 浓水从膜元件的另一端面流 出。
实施例 2
如图 3所示， 本实施例与实施例 1 不同的地方在于， 进水流道 210的与折边 211相邻的两侧边 212. 213远离中心产水管 400的部分 区段闭合密封方式不同， 在本实施例中， 在净水膜片组 11缠绕在中 心产水管 400之后用环形端盖 600 (端盖内涂有胶水）将卷式反渗透 膜元件两端面 12 , 13外部区域封堵， 使中心产水管 400和端盖 600 之间具有间隙， 形成原水进水口 214。 其它结构与实施例 1相同， 这 样的密封方式的好处是更容易对膜原件的进行装配。
实施例 3
如图 4所示， 本实施例与实施例 1、 实施例 2不同的地方在于， 为了实现卷式反渗透膜原件能够消除原水进水口的进水死角，避免原 水进水口结垢而影响水质， 在原水进水口 214中设有进水管 800 , 进 水管 800从膜元件的一端原水进水口 214—直延伸到膜元件另一端的 原水进水口 214 , 并且进水管 800上具有多个面向浓水出水口 215的 小孔（图中未示出）。
通过这样的改进，进水先流进进水管 800 ,然后进水从进水管 800 的小孔向浓水出水口 215方向喷射进进水流道 300 , 使得进水均匀， 不会存在进水死角， 从而避免了结垢。
在本实施例中，反渗透膜片 200经折叠形成两层进水流道 210和 产水流道 220 , 所述每层进水流道 210两端都具有原水进水口 214和 浓水出水口 215 , 每个原水进水口 214中均设有进水管 800 , 并且进 水管 800的管口与进水流道 210的侧边 212、 213齐平。 这样结构， 使得进水更加顺畅。
以上就是本发明的卷式反渗透膜元件，从上述详细描述， 可以看 出，经过这样的改进，本发明的反渗透膜元件加大了膜表面水流速度， 减小膜表面浓差极化， 降低卷式膜元件的污染速度， 从而延长了膜元 件的使用寿命。
但是， 上述具体实施方式只是示例性的， 是为了更好使本领域的 技术人员能够理解和实施本发明，不能理解为是对本发明保护范围的 限制。 只要是基于本发明所揭示的精神所作的任何等同改变或修饰， 均落入本发明的保护范围。

Claims

O 2011/050608 权 利 要 求 书 PCT/CN2010/072738
1、 一种卷式反渗透膜元件， 由纯水导流网、 反渗透膜片、 进水 导流网叠加构成的至少一组净水膜片组缠绕在中心产水管上形成，所 述反渗透膜片经折叠内表面形成进水流道，相邻外表面之间形成产水 流道，所述进水导流网位于进水流道中 ,纯水导流网位于产水流道中 , 所述产水流道仅具有面向中心产水管的纯水出水口，其它三侧边闭合 密封，所述进水流道的与折边相邻的两侧边远离中心产水管的部分区 段闭合密封，使该两侧边接近中心产水管处分别形成小段原水进水口 以及使进水流道的与折边相对的侧边形成浓水出水口。
2、 根据权利要求 1所述的卷式反渗透膜元件， 其特征在于： 所 述进水流道的与折边相邻的两侧边远离中心产水管的部分区段闭合 密封是在净水膜片组缠绕在中心产水管之前用胶水将该远离中心产 水管的部分区段粘合。
3、 根据权利要求 1所述的卷式反渗透膜元件， 其特征在于： 所 述进水流道的与折边相邻的两侧边部分闭合密封也可以在净水膜片 组缠绕在中心产水管之后用环形端盖将所述卷式反渗透膜元件两端 面外部区域封堵， 使中心产水管和端盖之间具有间隙。
4、 根据权利要求 1所述的卷式反渗透膜元件， 其特征在于： 所 述原水进水口长度占进水流道的与折边相邻的两侧边长度的 1 /4 ~
1 / 3。
5、 根据权利要求 1所述的卷式反渗透膜元件， 其特征在于： 所 述净水膜片组有两组缠绕在中心产水管上。
6、 根据权利要求 1所述的卷式反渗透膜元件， 其特征在于： 所 述原水进水口中设有进水管，所述进水管上具有多个面向浓水出水口 的小孔。
7、 根据权利要求 6所述的卷式反渗透膜原件， 其特征在于： 所 述进水管的管口和所述进水流道的与折边相邻的侧边齐平。
8、根据权利要求 6或 7所述的卷式反渗透膜原件， 其特征在于： 所述反渗透膜片经折叠形成两层进水流道和产水流道，所述每层进水 流道两端都具有原水进水口， 所述每个原水进水口中均设有进水管。
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