JPH0641890U - Water purifier with permeable membrane - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Excessive pressure against the membrane of the water purifier with permeable membrane,
Avoid high flow load, prevent unjustified membrane fouling and enhance economic effect. [Structure] As a medium capable of removing components to be removed in the water to be treated, one or more selected from a permeable membrane having at least 0.5 μm pores, that is, a microfiltration membrane, an ultrafiltration membrane, or a reverse osmosis membrane. In the attached water purifier, a flow rate adjusting mechanism is provided on the treated water inflow side, and a mechanism capable of detecting the differential pressure between the treated water inflow side to the medium and the treated water outflow side treated by the medium is provided. Equipped

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a water purifier equipped with at least a permeable membrane as a medium capable of removing the components to be removed from the water to be treated, with a so-called flow rate adjusting mechanism that maintains a constant flow rate even if the water pressure fluctuates. Regarding water purifier.

[0002]

[Prior art]

 In recent years, due to pollution of lakes, rivers, etc., which are the sources of city water, a large amount of chlorine is used in the water purification process, and as a result, a carcinogen, trihalomethane, is produced as a by-product. Clean water is distributed to households. Of course, its content is below the EPA standard, but it is never desirable for health. Also, in lakes and marshes, which are closed water areas, diosmin, 2MIB, and other off-flavors cause pollution due to organic matter pollution, which can hardly be removed in the water purification process.

From such a background, water purifiers have been widely used at home, and particularly, stationary water purifiers equipped with a permeable membrane and having a precise filtration function have come to be widely used. In other words, it is difficult to remove colloidal substances in the sand filtration process, which is the final process of the water purification process at water purification plants, especially because of the corrosion of water receiving tanks, raised water tanks, and piping of apartment houses, office buildings, etc. When removing the color-causing metal hydroxides, microorganisms, etc. produced by A water purifier equipped with a permeable membrane of about 05 μm is effective. However, on the other hand, depending on the method of use, the degree of contamination of the film is accelerated and its life is shortened. Although these water purifiers publicize the importance of specifying and using a filtration flow rate within a specific range, in actual use at home, the opening degree of the main plug on the inflow side of the water purifier falls within a specific range. There is no consideration to adjust to the flow rate of the enclosure, and there are many cases in which the flow rate is exceeded and the water supply pressure is controlled to supply a large amount of clean water to the water purifier at one time. Repeated use in this way accelerates membrane fouling, increases filtration resistance rapidly, makes it impossible to obtain treated water relatively early, and accelerates replacement of the membrane module. In addition, such severe use also causes damage to the membrane and, in some cases, the water purifier itself.

[0004]

[Problems to be solved by the device]

 In the present invention, the conventional water purifier equipped with a permeable membrane promotes membrane contamination due to water supply exceeding the specified value, resulting in a sharp decrease in filtration flow rate, increased water resistance of the membrane, and damage to the membrane. To solve problems such as the life of

[0005]

[Means for Solving the Problems]

 The present invention, as a medium capable of removing the components to be removed from the treated water, is provided at the treated water inflow side of a water purifier equipped with at least a permeable membrane in response to fluctuations in the water pressure of the treated water. A water purifier equipped with a permeable membrane that is equipped with a flow rate adjustment mechanism that can always adjust to a constant flow rate.The flow rate adjustment mechanism creates a flexible elastic body by receiving the fluid resistance due to the increase and decrease of the flow rate due to the rise and fall of the hydraulic pressure. It provides a constant flow rate adjustment mechanism with a built-in or bendable variable orifice and a fluid resistance detection mechanism that can detect the fluid resistance of the medium contained in the water purifier, and a permeable membrane mounted water purifier for deployment. .

The operation and effect of the present invention will be described below with reference to FIGS.

【Example】

 1 to 6 show an embodiment of a flow rate adjusting mechanism that can be adopted in the present invention and can always adjust to a constant flow rate in response to fluctuations in water pressure, and are all vertical sectional front views. FIG. 7 shows an embodiment of the present invention, and is for explaining the action and effect of a water purifier having a flow rate adjusting mechanism incorporated therein.

First, in FIG. 1, supply water having a water pressure flows into a flow rate adjusting mechanism 2 via a pipe line 1. A flow straightening plate 7 is provided at the inlet of the flow rate adjusting mechanism 2, where it is appropriately dispersed, and the fluid is supported on the back side by an elastic body 5 which can be expanded and contracted by hydraulic pressure, and is openably and closably supported at a fulcrum 6. It hits the front side of the door 4 that opens. Further, the fluid flows into the pipe line 3 through the gap between the two double doors 4 and reaches the water purifier (not shown). The shape of the door 4 may be square or semi-circular. In the former case, the cross-sectional shape of the flow rate adjusting mechanism 2 is square, and in the latter case it is circular.

When a high-pressure, high-flow rate fluid hits the door 4 supported by the fulcrum 6, the elastic body 5, for example, a spring is contracted by the resistance and the two doors 4 gradually move in the closing direction. You FIG. 2 shows the result, which is almost horizontal and the channel is narrowed. There is a stopper 9 behind the door 4 to prevent the door from retracting more than a predetermined amount. That is, the higher the pressure and the flow rate of the fluid hit the door, the more the door 4 moves in the closing direction, and the narrower the flow passage formed by the two doors becomes. Is limited, and therefore the amount of water sent to the water purifier via the conduit 3 is small.

In the present invention, the number, shape and number of steps of the door are not limited at all, and in the embodiment, the position of the elastic body 5 is behind the door 4, but it is attached to the front side of the door 4. The door 4 may be extended by the fluid resistance received by the door 4. Further, there is no limitation on the type and shape of the elastic body 5.

3 and 4 show another embodiment in which the door 4 itself is bendable, and when it receives a fluid of high pressure and high flow rate, it bends due to its resistance and holds a predetermined flow path. However, the bending is gradually corrected, and the result shown in FIG. 4 is obtained, so that the flow rate is restricted in order to narrow the flow path between the two doors 4, and the flow rate through the pipe line 3 is restricted. When the pressure becomes low and the flow rate becomes low, the door 4 is restored and the flow path between the doors becomes wide again. As the door, a flat plate-like elastic body having a bending restoring force, such as a thin steel plate or a resin plate, can be used.

5 and 6 have a rubber or resin ring incorporated therein. In FIG. 5, the elastic ring-shaped pedestal 10 is fitted and inserted in the tubular flow rate adjusting mechanism 2 and is held by the support base 8. One side of the elastic body 5 is supported by the support base 8, and the other side supports the elastic annular limiting hole 11. The fluid flows through the flow path 1 toward the elastic annular restriction hole 11 by the flow straightening plate 7. The fluid flows through the flow path formed by the straightening vane 7 and the elastic annular restriction hole 11 and the center of the elastic annular restriction hole 11 and further through the center of the elastic annular pedestal 10 into the conduit 3. However, when a high-pressure, high-flow rate fluid flows in through the flow path 1, the annular portion of the elastic annular limiting hole 11 becomes a resistance to compress the elastic body 5 supporting it, and the elastic annular limiting hole 11 Gradually approaches the elastic annular pedestal 10. As a result, as shown in FIG. 6, the flow path is limited to the central hole of the elastic annular restriction hole 11, and the flow rate is reduced. Depending on the water pressure and the flow rate, the elastic annular restriction hole 11 may be close to the elastic annular pedestal 10. In that case, some fluid may flow between the two, but the amount is considerably large. The flow rate to the pipeline 3 is limited as a whole.

In the embodiment shown in FIG. 5, the elastic annular pedestal 10 is not always necessary, and the elastic annular limiting hole 11 serves as a support for the elastic annular body 5 due to the high pressure and high flow rate of the fluid, so that the downstream side is The flow path at the boundary between the flow rate adjusting mechanism 2 and the flow path 3 may be inscribed in the narrowed portion. Further, the elastic annular pedestal 10 and the elastic annular limiting hole 11 do not have to be elastic bodies, but it is convenient that the elastic annular pedestal 10 and the elastic annular limiting hole 11 are more elastic because of better adhesion.

In FIG. 7, the activated carbon packed tower 12 is filled with the granular activated carbon packed layer 14, and the permeable membrane device 17 communicating with the pipeline 16 is equipped with the permeable membrane 18 of 0.1 to 0.05 μm. 2 shows a water purifier configured to discharge permeate from line 19. First, the raw water flows into the dispersion chamber 13 below the granular activated carbon packed bed 14 of the activated carbon packed tower 12 through the pipe 1 when the valve 20 is opened. A flow rate adjusting mechanism 2 is provided between the pipe line 1 and the bottom opening of the dispersion chamber 13, so that the flow rate of the raw water flowing into the dispersion chamber 13 can be controlled so that the raw water pressure in the pipe line 1 is 2 to 7 kg. / Cm ² , even if it changes to 3 to 3. It can be controlled within a range of about 5 l / min. The raw water rises as an upward flow in the granular activated carbon packed bed 14, and the treated water is collected in the water collection chamber 15. During this time, free chlorine, off-flavor components, and trace organic components in raw water are decomposed and adsorbed and removed. The treated water in the water collection chamber 15 reaches the membrane surface of the permeable membrane 18 of the permeable membrane device 17 through the pipe line 16 and is subjected to membrane permeation due to water pressure, and flows out to the back surface side of the permeable membrane 18 as membrane permeated water, It is discharged from the line 19 to the outside of the system. During this time, the suspension, microorganisms and the like in the treated water are completely removed, and the water becomes clear purified water.

During operation of this water purifier, the water pressure of the raw water flowing through the pipe 1 passing through the valve 20 fluctuated within the range of 2.0 to 5.0 kg f / cm ² , but the system from the pipe 19 The flow rate of the purified water discharged to the outside could be maintained in the range of 2.9 to 3.4 l / min.

When the flow rate adjusting mechanism 2 is not provided, there is a fluctuation of 5.2 to 8.8 l / min, a large load is applied to the granular activated carbon packed bed 14 and the permeable membrane 18, and the purification treatment effect, especially free chlorine. Removal rate decreased from 97% to 90%. Further, many contaminants rapidly adhered to the membrane surface of the permeable membrane 18, and the rate of decrease in the amount of membrane permeated water with the passage of time was large due to consolidation due to water pressure.

Further, in FIG. 7, a thin tube 21 for guiding the dynamic pressure from the raw water dispersion chamber 13 and a thin tube 22 for guiding the static pressure from the conduit 19 are led to the differential pressure gauge 23, respectively, and the fluid is fed to the water purifier. When the fluctuation of the differential pressure gauge 23 when sent was observed, it was found that the differential pressure was about 0.45 to 0.5 kg f / cm ^{2 according} to the present invention, but was 0.8 when not according to the present invention. It changed to 2.3 kg f / cm ² , showing that the flow rate fluctuation was large and the load fluctuation on the water purifier was large.

As described above, in order to stabilize the differential pressure detection system, the granular activated carbon packed bed 14 is contaminated by using the water purifier for a long time, and the membrane surface of the permeable membrane 18 of the permeable membrane mounting device 17 is contaminated. The increase in pressure loss can also be displayed as a stable value on the differential pressure gauge 23, and by knowing the degree of increase in that value, it becomes possible to detect the usage limit of the granular activated carbon packed bed 14 and the permeable membrane 18. . In other words, if these are made into cartridges, their life can be known and the frequency of replacement with new cartridges can be known.

[0018]

[Effect of the device]

 According to the present invention, in a water purifier equipped with a permeable membrane, even if the amount of supplied water changes due to a large change in the supply water pressure, the flow rate sent to the water purifier does not change greatly and is almost constant. Since it is controlled within the range, the amount of permeated water through the membrane does not change substantially correspondingly, the load of pollutants on the membrane is reduced, and undue water pressure is not loaded on the membrane surface. Even if contaminants adhere to the surface, it does not consolidate the surface of the membrane and does not raise the permeation resistance of water excessively. Therefore, the life of the cartridge, especially the permeable membrane, can be extended, that is, the replacement frequency of the cartridge can be suppressed to be low, so that the economical effect is large.

Further, according to the present invention, the differential pressure can be stably read when the differential pressure generated by the activated carbon layer or the membrane surface is detected by the differential pressure detection system. The degree of increase in the differential pressure can be easily detected, and by grasping the degree of increase in the differential pressure, there is a great effect that it can be used as a guideline for cartridge replacement.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of a flow rate adjusting mechanism that can be used in the present invention.

FIG. 2 is a vertical cross-sectional front view showing the operation of the flow rate adjusting mechanism when a high pressure, high flow rate fluid is loaded in FIG.

FIG. 3 is a vertical sectional front view showing another embodiment of a flow rate adjusting mechanism that can be used in the present invention.

FIG. 4 is a vertical cross-sectional front view showing the action of the flow rate adjusting mechanism when a high pressure, high flow rate fluid is loaded in FIG.

FIG. 5 is a vertical sectional front view showing another embodiment of the flow rate adjusting mechanism that can be used in the present invention.

FIG. 6 is a vertical cross-sectional front view showing the operation of the flow rate adjusting mechanism when a high pressure, high flow rate fluid is loaded in FIG.

FIG. 7 is an explanatory diagram of an embodiment showing the effect of the present invention.

[Explanation of symbols]

 1 Pipeline 2 Flow Rate Control Mechanism 3 Pipeline 4 Door 5 Elastic Body 6 Support Point 7 Rectifier Plate 8 Supporting Stand 9 Stopper 10 Elastic Annular Pedestal 11 Elastic Annular Restricting Hole 12 Activated Carbon Packing Tower 13 Dispersing Chamber 14 Granular Activated Carbon Packing Layer 15 Water Collection Room 16 Pipeline 17 Permeable Membrane Device 18 Permeable Membrane 19 Pipeline 20 Valve 21 Capillary 22 Capillary 23 Differential Pressure Gauge

Claims (3)

[Scope of utility model registration request] 1. A water pressure of the treated water is provided on the treated water inflow side of a water purifier equipped with a permeable membrane having pores smaller than 0.5 μm as a medium capable of removing components to be removed from the treated water. Water purifier with permeable membrane equipped with a flow rate adjustment mechanism that can always adjust to a constant flow rate in response to fluctuations 2. The utility model registration claim in which the flow rate adjusting mechanism is a variable orifice that has a flexible elastic body built-in or a flexible orifice that is built in when the flow rate adjusting mechanism receives a fluid resistance due to an increase or decrease in flow rate depending on the level of dynamic water pressure. The permeable membrane-attached water purifier according to claim 1. 3. The permeable membrane-attached water purifier according to claim 1, wherein the utility model registration is provided with a fluid resistance detection mechanism capable of detecting the fluid resistance of a medium contained in the water purifier.