JP2000084371A - Spiral type electric deionized water producing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase throughput by communicating respectively an upstream side channel, which is formed by dividing a channel extending in the axis direction of a spiral element in a center electrode by a partition wall on the way, with a flow-in passage of water to be treated to a desalting chamber and a downstream side channel with a flow-out passage of the water to be treated from the desalting chamber to simplify the structure and to reduce the pressure difference. SOLUTION: The closed bag shaped desalting chamber 25 formed by closing four sides with an anionic exchange membrane 22 and a cationic exchange membrane 23, which are opposed to each other, is communicated with the channel 27 through plural holes of a pipe member 28. The channel 27 is divided into the upstream side channel 35 communicated with the flow-in passage of the water to be treated 37 to the desalting chamber 25 by the partition wall 34 on the way and the downstream side channel 36 communicated with the flow-out passage of treated water from the desalting chamber 25. The flow in the desalting chamber 25 is U-turned one time from the flow-in passage 37 toward the flow-out passage 38 by providing a guide wall 39 from the inside of the desalting chamber 25 toward the outside end but not to reach the outside end at a position corresponding to the partition wall 34 in the desalting chamber 25. An ion exchanger 40 is filled in the desalting chamber 25. As a result, the distribution and discharge system of the water to be treated is simplified and the throughput is improved with low pressure difference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral-type electric deionized water producing apparatus, and more particularly to a spiral-type electric deionized water producing apparatus whose structure can be simplified and the processing capacity can be greatly increased. .

[0002]

2. Description of the Related Art A spiral-type electric type in which an ion exchange membrane comprising an anion exchange membrane and a cation exchange membrane is spirally wound to form a spiral desalination chamber, and a concentrating chamber is formed in a direction along the spiral shape. An apparatus for producing deionized water is disclosed in JP-A-6-7645. In this apparatus, the inlet and outlet of the desalination chamber and the inlet and outlet of the concentration chamber are both provided at the inner peripheral end and the outer peripheral end side of the spiral shape, and in particular, a system for distributing water to be treated, a discharge system for treated water, The structure of the concentrated water distribution system and discharge system is very complicated, and the structure of the entire apparatus is also complicated. In addition, since the structure of these parts is a complicated and relatively large mechanism, these mechanisms occupy a large space in the pressure vessel, and a large space for effective desalination treatment by the ion exchange membrane is secured. It has become difficult. Therefore, in such a structure, winding a pair of anion exchange membrane and cation exchange membrane to form a single spiral desalination chamber is at best,
It is almost impossible to wind a plurality of sets of anion exchange membrane and cation exchange membrane.

[0003] The desalting chamber formed between the anion exchange membrane and the cation exchange membrane is usually formed in a relatively narrow (low in height) flow path from the viewpoint of improving the efficiency of the desalination treatment. However, when only one spiral desalting chamber is formed as described above, the pressure difference (pressure loss) in the flow path increases, and high-pressure operation of the pump is required, which is not desirable in terms of energy efficiency and operation. In addition, since the entrance and exit of the desalination chamber have a complicated structure as described above, the differential pressure is further increased. Further, in such an apparatus having a large differential pressure and only one desalination chamber, a large processing capacity cannot be expected.

[0004] Further, since the ion exchange membrane shrinks and changes its dimensions when it is dried, it is usually required to assemble or assemble it into a predetermined assembly while keeping it in a wet state. Work is desired. However, in a device having a complicated structure as disclosed in JP-A-6-7645, it takes time to fill the ion exchanger and attach the ion exchange membrane,
In addition, there is a high possibility that an error will occur in the manufacturing stage, and a significant structural improvement is desired.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to focus on the above-mentioned problems in the conventional apparatus, and to easily attach an ion exchange membrane and fill an ion exchanger with a simple structure, and In addition, the inlet and outlet of the desalting chamber and the concentrating chamber can be configured compactly with a simple structure, reducing the differential pressure, securing a large space for effective desalination treatment using an ion exchange membrane, and a plurality of sets of ion exchange membranes. It is an object of the present invention to provide a spiral-type electric deionized water production apparatus capable of easily forming a plurality of demineralization chambers and easily and significantly increasing the processing capacity.

[0006]

In order to solve the above-mentioned problems, a spiral-type electric deionized water producing apparatus of the present invention comprises an ion exchange membrane comprising an anion exchange membrane and a cation exchange membrane around a center electrode. In a spiral-type electric deionized water production apparatus having a spiral element wound in a spiral shape, a desalting chamber between an anion exchange membrane and a cation exchange membrane, and a concentrating chamber formed between winding layers of an ion exchange membrane, a center electrode A water passage extending in the axial direction of the spiral element is provided therein, and the water passage is partitioned into an upstream water passage and a downstream water passage by a partition wall, and the upstream water passage is an inflow passage of the water to be treated into the desalination chamber. And a downstream water passage connected to an outflow passage of the treated water from the desalting chamber.

[0007] The anion exchange membrane and the cation exchange membrane forming the upstream water passage are sealed with respect to the communication passage to the water passage, that is, the portion other than the inflow passage of the water to be treated to the desalination chamber and the outflow passage of the treated water. The bag structure is formed.

In the desalting chamber, a flow path from the inflow channel of the water to be treated to the outflow channel of the treated water is at least once formed
Preferably, a guide wall for turning is provided.
The guide wall can take various forms as shown in the embodiments described later.

A plurality of water passages can be easily provided in the center electrode. For example, a plurality of water passages extending in the longitudinal direction of the center electrode can be provided in the circumferential direction of the substantially cylindrical or cylindrical center electrode. By connecting a desalination chamber formed by an anion exchange membrane and a cation exchange membrane in correspondence with each water channel, a plurality of sets of desalination chambers and water channels are provided.

[0010] The water flow direction of the concentrating chamber is preferably set in a direction from one end face to the other end face in the longitudinal direction of the spiral element. This allows the concentrated water to pass substantially straight in the direction along the axis of the spiral element.

The concentration chamber can be formed by interposing a spacer and / or an ion exchanger between the winding layers of the ion exchange membrane. The ion exchanger is usually filled in the desalting chamber in order to enhance the desalination function.However, by interposing or filling the ion exchanger in the enrichment chamber, the current can easily flow and the entire apparatus can be used. Can further improve the desalination function.

The spiral element is accommodated in, for example, a cylindrical pressure vessel, and an outer peripheral electrode is provided on the inner peripheral surface side of the pressure vessel, so that a predetermined DC voltage is applied between the spiral element and the center electrode. The target deionization action is exhibited.

It is preferable to provide an activated carbon layer between the spiral element and the outer electrode. The activated carbon layer decomposes chlorine generated in the vicinity of the outer electrode into components that do not adversely affect the chlorine.

In the spiral-type electric deionized water producing apparatus according to the present invention, a water passage extending in the axial direction of the spiral element is provided in the center electrode, and the water to be treated supplied to the water passage is provided. Flows into the desalination chamber from the upstream water channel, and after desalination, the treated water flows out of the desalination chamber to the downstream water channel, where it is sent downstream and discharged to the outside. You. Therefore, the water to be treated flows into and out of the desalination chamber through substantially one water channel, and a complicated distribution and discharge mechanism as in the conventional apparatus is not required. The mechanism of the entrance / exit portion to the desalination chamber is greatly simplified, and the space occupied by these portions becomes extremely small.

The simplification of the mechanism facilitates the installation of the ion-exchange membrane and the filling of the ion-exchanger, as well as the assembling with higher accuracy and the complete sealing of this portion. Mixing of the water to be treated or the treated water with the concentrated water can be easily prevented. Further, since the mechanism of this portion can be made compact, a larger space for effective desalination treatment by the ion exchange membrane in the pressure vessel can be secured, and the performance can be improved.

Further, the simplification of the structure of the inlet / outlet portion of the desalting chamber makes it possible to reduce the differential pressure (pressure loss), thereby improving the energy efficiency of the pump and reducing the power consumption.

In particular, since it is possible to provide a plurality of sets of desalination chambers and water channels, it is possible to greatly reduce the differential pressure and greatly increase the processing capacity (processing flow rate). As a result, it is possible to further improve energy efficiency.

Further, at the same time, the water flow structure of the concentrating chamber can be simplified, and the pressure difference in the concentrated water passage can be reduced.
In particular, if concentrated water is allowed to pass straight from the one end surface side to the other end surface side of the spiral element, a complicated concentrated water distribution and discharge system in the conventional apparatus becomes unnecessary.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. 1 to 3
FIG. 4 shows a schematic overall configuration of a spiral-type electric deionized water producing apparatus according to an embodiment of the present invention. FIG. 4 shows a state before the spiral element is wound, and FIG. 5 shows a state at the time of winding. FIG. 6 shows the configuration of a pair of ion exchange membranes and water channels, and FIG. 7 shows the configuration of the sealing portion.

Referring to FIGS. 1 and 2, a spiral-type electric deionized water producing apparatus 1 includes a cylindrical pressure vessel 2,
A spiral element 3 housed in the pressure vessel 2. A concentrated water raw water introduction pipe 5 is connected to one side wall 4 of the pressure vessel 2, and the introduced concentrated water raw water 6 is supplied to one end face side of the spiral element 3. In addition, the treated water introduction pipe 7 is provided to penetrate the side wall 4, and the treated water 8 is separated and supplied to each of the water channels described below in a state of being separated from the concentrated water. It has become. Concentrated water 9 that has passed through spiral element 3
Is discharged through a concentrated water discharge pipe 11 connected to the other side wall 10. The treated water 12 which has been desalinated in the spiral element 3 is collected from each channel and then discharged through a treated water discharge pipe 13.

As shown in FIG. 3, the spiral element 3 is formed by winding an ion exchange membrane 24 composed of an anion exchange membrane 22 and a cation exchange membrane 23 around a center electrode 21 in a spiral shape. Exchange membrane 2
3, and a concentrating chamber 26 is formed between the winding layers of the ion exchange membrane 24 in a spiral shape. In the center electrode 21, four water paths 27 extending in the axial direction of the spiral element 3 are arranged at equal pitches in the circumferential direction of the center electrode 21 in this embodiment. Each water passage 27 is formed by a pipe member 28, and the pipe 28 is inserted into a concave groove 29 formed in the center electrode 21. Each water channel 27 communicates with a corresponding desalting chamber 25. An outer electrode 30 is provided on the inner surface of the pressure vessel 2, and a predetermined DC voltage is applied between the outer electrode 30 and the center electrode 21. In this embodiment, the activated carbon layer 31 is provided between the spiral element 3 and the outer electrode 30, particularly on the inner peripheral surface of the outer electrode 30.
Is provided, so that chlorine generated in this portion can be decomposed.

The spiral element 3 is formed as shown in FIGS. FIG. 3 shows a state before winding, in which an ion exchange membrane 24, which is a set of an anion exchange membrane 22 and a cation exchange membrane 23, is connected to a corresponding water channel 27 (pipe member 28). Ion exchange membrane 24
Between them, a spacer 32 for forming the concentration chamber 26 is provided.
A total of four cards are provided. The spacer 32 is made of, for example, a net.

Anion exchange membrane 22 and cation exchange membrane 23
After being opposed to each other, a bag-shaped desalination chamber 25 having four sides closed and substantially sealed is formed, and the desalination chamber 25 has a plurality of holes 33 provided in the pipe member 28. Through the water channel 27. The water channel 27 is divided into an upstream water channel 35 and a downstream water channel 36 by a partition wall 34 provided on the way, and the upstream water channel 35 is connected to the desalination chamber 2.
5 into the inflow channel (inlet) 37 of the water to be treated,
6 is an outflow passage (outlet) 38 of the treated water from the desalting chamber 25,
Each is communicated. In the desalination room 25, the partition wall 3
4, a guide wall 39 extending from the inner end of the desalting chamber 25 toward the outer end but not reaching the outer end is provided. Is turned once from the inflow channel 37 toward the outflow channel 38. In the present embodiment, the ion exchanger 40 is filled in the desalting chamber 25.

The four sets of ion exchange membranes 24 and spacers 32 configured as described above are wound as shown in FIG. 5 to constitute the spiral element 3 as shown in FIG.
The flow of the water to be treated and the flow of the concentrated water are as shown in FIG. That is, the water 8 to be treated enters the desalination chamber 25 from the upstream water passage 35 of the water passage 27 through the inflow passage 37, and is subjected to a desalination treatment while being U-turned by the guide wall 39 in the desalination chamber 25. The treated water 12 flows into the downstream water channel 36 of the water channel 27 through the outflow channel 38, and is discharged therefrom via the discharge pipe 13 (FIGS. 1 and 2).
On the other hand, the concentrated raw water 6 flows into the enrichment chamber 26 from one end face of the spiral element 3, substantially goes straight through the enrichment chamber 26, and the other end face of the spiral element 3 is discharged therefrom. 1, Figure 2).

FIG. 6 is an enlarged view of one set of the four sets of the ion exchange membrane 24, the water channel 27, and the spacer 32.
In the present embodiment, the four sides of the anion exchange membrane 22 and the cation exchange membrane 23 are fixed by the fixing member 41 with the pipe member 28 interposed therebetween, and are closed. Further, as shown in FIG. 7, an adhesive 42 (or resin) may be applied and cured in order to enhance the sealing property of the closed portion.

In the spiral-type electric deionized water producing apparatus configured as described above, the distribution and discharge of the water 8 to be treated in the spiral element 3 can be performed substantially in one water channel 27. Such a complicated mechanism is not required at all. Therefore, the inlet / outlet section to the desalination chamber 25 has a simple structure, and the differential pressure (pressure loss) is reduced. In addition, since this portion is small, only a very small space is occupied in the pressure vessel 2, and a large space for an effective desalination treatment by the ion exchange membrane 24 can be secured.

Further, as shown particularly in FIG. 4, a plurality of desalting chambers 25 can be easily formed, so that the processing capacity can be greatly increased.

Further, the water flow structure of the concentrating chamber 26 is also extremely simple, and the water simply passes straight through the concentrating chamber 26, so that a low pressure loss can be suppressed. That is, a complicated concentrated water distribution and discharge system as in the conventional structure is not required at all.

In the above embodiment, the concentration chamber 2
Although 6 is formed only by the spacer 32, it may be formed by an ion exchanger, or may be formed by using both the spacer 32 and the ion exchanger. By filling the concentration chamber 26 with the ion exchanger, the current easily flows, and the desalting performance of the entire apparatus can be further improved.

Further, as for the shape of the guide wall, various forms can be adopted. For example, as shown in FIG. 8, a structure in which guide walls 52a, 52b, and 52c are provided so that the flow can make a U-turn substantially three times in the desalting chamber 51,
As shown in FIG. 9, in addition to the guide wall 39, the guide wall 54a can flow zigzag while making a U-turn inside the desalting chamber 53 so that the ion exchange membrane can be used more effectively in every corner. , 54b, 54c, 54d can be adopted.

[0031]

As described above, according to the spiral-type electric deionized water producing apparatus of the present invention, a water channel divided by a partition wall is provided at the center electrode, and the upstream water channel and the downstream water channel are desalted. Because it was designed to communicate with the entrance and exit of the room,
In particular, the distribution and discharge system of the water to be treated can be greatly simplified, the differential pressure is reduced and the energy efficiency is improved, and the space occupied by this part is kept small to secure a large space for desalination treatment and the processing capacity. Can be improved.

Further, the simplification of the structure can greatly facilitate the installation of the ion exchange membrane and the filling of the ion exchanger.

Further, the structure for passing the concentrated water can be greatly simplified at the same time, and the pressure difference can be reduced and the energy efficiency can be improved for the concentrated water.

Further, since a plurality of desalting chambers can be easily formed, the processing capacity can be greatly increased.

[Brief description of the drawings]

FIG. 1 is a schematic vertical sectional view of a spiral-type electric deionized water producing apparatus according to one embodiment of the present invention.

FIG. 2 is an external perspective view of the apparatus of FIG.

FIG. 3 is a cross-sectional view of the device of FIG.

4 is a perspective view of the device of FIG. 1 before winding a spiral element portion. FIG.

FIG. 5 is a schematic configuration diagram showing a state of winding the spiral element of FIG. 4;

FIG. 6 is an enlarged perspective view of one set of elements of the device of FIG. 4;

FIG. 7 is an enlarged partial sectional view of the device of FIG. 6;

FIG. 8 is a schematic configuration diagram showing another embodiment of the guide wall.

FIG. 9 is a schematic configuration diagram showing still another mode of the guide wall.

[Description of Signs] 1 Spiral-type electric deionized water production device 2 Pressure vessel 3 Spiral element 4, 10 Side wall 5 Concentrated raw water introduction pipe 6 Concentrated raw water 7 Treatment water introduction pipe 8 Treated water 9 Concentrated water 11 Concentration Water discharge pipe 12 Treated water 13 Treated water discharge pipe 21 Center electrode 22 Anion exchange membrane 23 Cation exchange membrane 24 Ion exchange membrane 25 Desalination chamber 26 Concentration chamber 27 Water channel 28 Pipe member 29 Groove 30 Outer peripheral electrode 31 Activated carbon layer 32 Spacer 33 Hole 34 Partition wall 35 Upstream waterway 36 Downstream waterway 37 Inflow channel (inlet) of treated water 38 Outflow channel (outlet) of treated water 39, 52a, 52b, 52c, 54a, 54b, 54
c, 54d Guide wall 40 Ion exchanger 41 Fixing member 42 Adhesive 51, 53 Deionization chamber

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D006 GA17 HA64 JA18A JA29A JA43A JA44A MA03 MA13 MA14 PA01 PB02 4D061 AA01 AB13 BA09 BB01 BB13 BB16 BB19 BB23 BB34

Claims (8)

[Claims] An ion exchange membrane comprising an anion exchange membrane and a cation exchange membrane is spirally wound around a center electrode, and a desalting chamber and an ion exchange membrane are wound between the anion exchange membrane and the cation exchange membrane. In a spiral-type electric deionized water producing apparatus having a spiral element in which a concentration chamber is formed between layers, a water path extending in the axial direction of the spiral element is provided in the center electrode, and the water path is provided with an upstream water path and a downstream water path by a partition wall in the middle. Along with dividing into a side waterway, the upstream waterway is communicated with the inflow path of the water to be treated into the desalination chamber, and the downstream waterway is communicated with the outflow path of the treated water from the desalination chamber. Spiral electric deionized water production equipment. 2. The spiral electric deionized water producing apparatus according to claim 1, wherein the desalting chamber is closed except for a communication path to the water channel. 3. A flow path from the inflow passage of the water to be treated to the outflow passage of the treated water is provided at least once in the desalination chamber.
3. The spiral electric deionized water producing apparatus according to claim 1, further comprising a guide wall for turning. 4. The spiral electric deionized water producing apparatus according to claim 1, wherein a plurality of sets of the desalting chamber and the water channel are provided. 5. The water flow direction of the enrichment chamber is set in a direction from one end face to the other end face in the longitudinal direction of the spiral element.
The spiral-type electric deionized water production apparatus according to any one of the above. 6. The spiral type according to claim 1, wherein the concentration chamber is formed by interposing a spacer and / or an ion exchanger between the winding layers of the ion exchange membrane. Electric deionized water production equipment. 7. The spiral type electric disconnector according to claim 1, wherein the spiral element is housed in a pressure vessel, and an outer peripheral electrode is provided on an inner peripheral surface side of the pressure vessel. Ion water production equipment. 8. The spiral electric deionized water producing apparatus according to claim 7, wherein an activated carbon layer is provided between the spiral element and the outer peripheral electrode.