JPH047081A - Water purifier - Google Patents

Abstract

PURPOSE:To certainly remove foreign matter by backwashing by arranging inorg. particles having a particle size smaller than that of activated carbon particles on the upstream side of a water purifying means composed of a hollow yarn membrane. CONSTITUTION:A part of the purified water accumulated in the purified water storage part alpha being the lower space of a piston 67 is discharged from a purified water discharge port 64 at the falling intial stage of the piston 67 but, from the point of time when the purified water discharge port 64 is closed by the piston 57, the purified water flows through a main cartridge 7 in the reserse direction to wash off the foreign matter bonded to the outer wall of a hollow yarn membrane 71 to be discharged to the outside from the port 903 connected to a port 900. At this time, the foreign matter composed of org. matter bonded to the hollow yarn membrane 71 through inorg. particles 79 peels off from the hollow yarn membrane 71 along with the inorg. particles 79 to be washed off. Further, the inorg. particles 79 again adhere to the hollow yarn membrane at the time of the next emission of purified water to prevent the direct adhesion of the org. matter to the hollow yarn membrane 71. By this method, foreign matter can be certainly removed by backwashing.

Description

[Detailed description of the invention]

[Industrial Application Field 1] The present invention relates to a water purifier that is equipped with a hollow fiber membrane and activated carbon as a water purifying means, and is also equipped with a backwashing means. [Prior Art] In a water purifier that is connected to a tap and filters tap water,
In recent years, in addition to activated carbon, hollow fiber membranes have been increasingly used as water purification means. This hollow fiber membrane is 0.1~
It has minute holes of 0.01 μ in the wall surface,
These pores are used to filter water by passing water from the outer wall of the hollow fiber membrane to the inner space of the hollow fiber membrane, making it possible to remove even bacteria. When such hollow fiber membranes are used as water purification means, as mentioned above, filtration is performed using fine pores.
Because clogging occurs early due to removed materials,
JP-A-61-238391 and JP-A-62-305
No. 07 or Japanese Patent Application Laid-Open No. 62-79809 discloses that foreign matter attached to the outer wall surface of a hollow fiber membrane can be washed away by backwashing in which water is flowed in the opposite direction to that during filtration. That's what I do.

[Invention or problem to be solved]

However, simply by backwashing the sheep, it is difficult to remove foreign matter, especially organic matter, that has adhered to the hollow fiber membrane. The present invention has been made in view of these points, and its purpose is to reliably wash away by backwashing the substances that adhere to the wood cleaning member made of hollow fiber membranes and cause clogging. To provide a water purifier capable of extending the life of a water purifying member.

[Means to solve the problem]

Accordingly, the present invention provides a water purifier that is equipped with a hollow fiber membrane and activated carbon as a water purification means, and is also equipped with a backwashing means for washing away foreign matter adhering to the water purification means by causing water to flow backwards. It is characterized in that inorganic particles smaller in diameter than activated carbon particles are disposed upstream of the water purification means consisting of a membrane. [Function] According to the present invention, since foreign substances made of organic substances adhere to the SI organic particles that adhere to the surface of the hollow fiber membrane and cover this surface, during backwashing, the organic substances are removed from the hollow fiber membrane surface together with the inorganic particles. It will peel off, and foreign matter must be removed by backwashing. [Example] The present invention will be described in detail below based on the illustrated example. This water purifier A has a case 6 as shown in FIGS. 1 and 2.
and the main cartridge 7 housed within this case 6.
It is composed of a stand 500 and exterior covers 501 and 502. In the figure, 506 is a suction cup. The case 6 consists of a lower case 60, an upper case 61, a cylinder part 62 disposed on the upper case 61, and a lid 63 that closes the upper opening of the cylinder part 62. The main cartridge 7 is attached to the lower case 60. It is housed in the upper part of the space surrounded by and the upper case 61. Further, a switching valve 9 for switching water flow is provided in the bottom of the lower case 60. The switching valve 9 includes a housing 90 fixed to the bottom plate of the lower case 60, covers 94 and 97 that close both ends of the housing 90, and is rotatably housed in the housing 90 and has one end penetrating through the cover 94. It consists of a cylindrical valve body 91 to which a lever 95 is attached.As shown in FIGS. An axially long water passage 902.
As shown in FIG. 4(b), the cover 97 has two bows 1-800 and 801 on its peripheral surface and a connection port 98 on its end surface. Here, the boat 900 is connected to the case 6, the boat 901 is connected to the tap water supply side via the L-shaped pipe 906 and the tube 18 shown in FIG. 3, and the boat 903 is connected to the T-shaped pipe 905.
connected to the drainage tube 907 through the water passage 902
connects boat 901 and boat 1-801, and connects boat 901 and boat 1-801,
04 connects boat 903 and boat 800. As shown in FIG. 4, the valve body 91 is connected to the boat 900.
An L-shaped communication hole 92 is provided in the portion where the boats 800 and 903 are located, and an L-shaped communication hole 93 that is in communication with the connection port 98 is provided in the portion where the boats 800 and 801 are located. Further, the valve body 91 is formed with two recesses lined up in the circumferential direction, and in both recesses, as shown in FIG. The ball 603 selectively engages in accordance with the rotation of the valve body 91, and positioning is performed by applying clicks at two positions when the valve body 91 is rotated by the lever 95. Reference numeral 85 in FIG. 3 is a drain valve disposed on the bottom plate of the lower case 60, and this drain valve 85 is normally kept open by a spring bias. The drain valve 85 is connected to a drain tube 907 via a tube 88 and a T-shaped pipe 905. The main cartridge 7 includes a cylindrical case 72 whose bottom opening is closed with a bottom lid 74, a cylindrical holder 73 fixed to the upper end of the cylindrical case 72, and a bundle of main cartridges 7 loaded into the holder 73. Hollow fiber II! 71, seven inorganic particles, and activated carbon 70 filled in the space between the outer surface of the holder 73 and the inner surface of the cylindrical case 72. A non-woven fabric 75 is provided to prevent the activated carbon 70 from leaking, and a non-woven fabric 77 is ultrasonically welded to a perforated plate 78 in the passage hole 76 formed on the upper circumference of the cylindrical case 2. This prevents the activated carbon 70 from leaking through the passage hole 76. Further, a nonwoven fabric 77 is also provided at the lower end opening of the holder 73, and the activated carbon 70 is attached to the holder 73.
It is designed so that it does not fall within 3. This main cartridge 7 is attached to a cylindrical case 72.
The upper end of the holder 73, which protrudes upward from the center of the upper surface, is threadedly connected to the top plate of the upper case 61, so that the holder 73 is disposed within the case 6. The main cartridge 7 can be replaced by separating the lower case 60 and the upper case 61, which are connected by screwing. It is arranged on the upper case 61 and the upper opening is the lid 63.
The closed cylinder part 62 is equipped with a purified water outlet 64 on the side surface of the central part in the vertical direction, and is rotatable around a vertical axis with respect to the upper case 61, and is fitted with a retaining ring 6.
5 prevents removal, and a piston 67 is disposed inside. A piston 67 has a gasket attached to its outer circumferential surface and opens and closes the purified water outlet 64 as it moves up and down, and is urged upward by a spring 69. When in the water purification position, as shown in Figure 1, the water purification outlet 64
in the open position. Further, the plug 100 passing through the lid 63 is connected to the other end of a tube 9 whose one end is connected to the connection port 98 of the switching valve 9 . The plug 100, which passes through the lid 63 and is attached with a retaining ring 68, is rotatable around a vertical axis with respect to the N63. and,
The nozzle 503 connected to the purified water outlet 64 of the cylinder part 62 protrudes to the outside through an opening 504 formed between the outer covers 501 and 502, or rotates the cylinder part 62. time, opening 50
The direction of the nozzle 503 can be changed within the range of 4, and at this time, the tube 9 is connected to the lower case 60.
Rotation is prevented by a rotation stopper 507 shown in FIG. 3 provided in the. However, as shown in FIGS. 2 and 4, the switching valve 9 of the water purifier A, as shown in FIG. 2 and FIG. If the raw water supplied from the faucet is sent to the water purifier A side through the tube 18, this raw water enters the case 6 through the boat 900 and enters the main cartridge 7. It enters the cylindrical case 72 through the upper passage hole 76 and comes into contact with the activated carbon 70 to remove relatively large particles and residual chlorine, and then is filtered by the hollow fiber membrane 71 to remove the remaining chlorine inside the cylinder part 62. The purified water enters the water storage part α, which is the space below the piston 67, and then flows through the purified water outlet 64 and the nozzle 503.
It flows out to the outside through. At this time, the drain valve 85 provided in the lower case 60
It is closed by water pressure. Further, the seven inorganic particles adhere to the surface of the hollow fiber membrane 71 due to the water flow at this time, and cover the surface of the hollow fiber M77. Therefore, foreign substances, especially organic substances, contained in raw water are
It will not be attached directly to the surface of the hollow fiber membrane 71, but will be attached on the inorganic particles 79. From the above-mentioned purified water discharge state, rotate the lever 95, and as shown in FIG.
- 900 and the boat 903 are in communication, and the connection port 98 is in communication with the boat 901 through the water passage hole 93 and the water passageway 902, then the raw water sent from the faucet is transferred between the water passageway 902 and the connection port. 98 into the space β between the piston 67 and the lid 63, and the water pressure pushes the piston 67 down against the six springs. For this reason, some of the purified water accumulated in the purified water storage section α, which is the space below the piston 67, is discharged from the purified water outlet 64 at the beginning of the downward movement of the piston 67.
From the point at which the piston 67 closes the purified water outlet 64, the water flows in the reverse direction inside the main cart lithium, washing away foreign matter adhering to the outer wall of the hollow fiber membrane 71, and draining the drain tube 907 from the boat 903 connected to the boat 900. is discharged to the outside through. At this time, the organic foreign matter adhering to the hollow fiber membrane 71 via the seven inorganic particles is peeled off from the hollow fiber membrane 71 together with the seven inorganic particles and washed away. In addition, these seven inorganic particles are transferred to the hollow fiber membrane 71 again during the next discharge of purified water.
This prevents organic substances from directly adhering to the hollow fiber membrane 71. After this backwashing is completed, if the lever 95 is returned to the water purification position, the switching valve returns to the state shown in FIGS. 1 and 4. At this time, the piston 67 is returned upward by the six springs (also biased by water pressure when water is still being supplied from the faucet to the water purifier A side), and for this reason, the space is The water used as backwashing power in β is pushed back and discharged from the drain tube 907 through the connection port 98, the water passage 904, and the port 903. Furthermore, when the water supply from the faucet is stopped, the inside of the case 6 is opened through the purified water outlet 64, so the water stagnant inside the case 6 is no longer subjected to water pressure and becomes open. tube 88 from drain valve 85
The inorganic particles 7 are discharged through the drain tube 907, and there is no need to worry about the generation of anaerobic bacteria due to the accumulated water in the case 6. It may be stored together with the activated carbon 70. However, the particle size of the seven inorganic particles is smaller than that of the activated carbon 70 so that they can enter the holder 73 through the nonwoven fabric 77. That is, seven inorganic particles pass through the nonwoven fabric 77 and enter the holder 73 due to the water flow when purified water is discharged, and are attached to the surface of the hollow fiber membrane 71 to cover the surface of the hollow fiber membrane 77. As shown in FIGS. 6 to 8, when a pre-cartridge 8 is housed in the case 6 in addition to the main cartridge 7, seven inorganic particles are placed on the side of the pre-cartridge 8. The pre-cartridge 8 shown in the figure is disposed directly above the boat 900 of the switching valve 9, which may include a case 80 whose bottom surface is formed of a perforated plate, a perforated plate 1282, and an upper and lower part inside the case 80. It consists of activated carbon 83 and seven inorganic particles sandwiched between non-woven fabrics 700 and 700, and of the upper and lower non-woven fabrics 700 to prevent leakage of the superagent 83, the upper one is welded to the lid 82 by ultrasonic waves or the like. ing. This pre-cartridge 8 uses the nonwoven fabric 700 and the activated carbon 83 to remove large particles and residual chlorine. In addition, the particles scattered in the activated carbon 83 are small! ! ! ! The organic particles 9 pass through the nonwoven fabric 700 and the nonwoven fabric 77 in the main cartridge 7 and adhere to the surface of the hollow fiber membrane 71, making it easy to remove organic substances during backwashing, as in the previous embodiment. In filling the pre-cartridge 8 with seven inorganic particles, in addition to scattering them in the layer of activated carbon 70 as described above, the seven inorganic particles are filled in the upper part of the pre-cartridge 8, and the activated carbon 73 is filled in the lower part. You may also do so. Moreover, if the lower nonwoven fabric 700 is made particularly fine, it is possible to prevent the inorganic particles 79 from flowing out. As the seven inorganic particles, kaolin, aluminum oxide, ferric hydroxide, etc. can be used. If the amount is too large, the non-ill particles 79 will completely cover the surface of the hollow fiber membrane 71 and no water will come out, so a small amount is sufficient.

【Effect of the invention】

As described above, in the present invention, organic foreign matter adheres to the inorganic particles that adhere to the surface of the hollow fiber membrane and cover this surface, so during backwashing, there are many foreign matters! ! It peels off from the hollow fiber membrane surface together with the mechanical particles,
For this reason, backwashing ensures the removal of foreign substances, and backwashing effectively extends the life of the hollow fiber membrane.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of one embodiment of the present invention, Fig. 2 is a cross-sectional view of the same, Fig. 3 is a broken bottom view of the same, and Fig. 4 (aHb).
5(a) and 5(b) are partial cross-sectional views of the same as above, FIG. 6 is a vertical cross-sectional view of another embodiment, 7 is a cross-sectional view of the same as above, and FIG. 8 is a pre-cartridge of same as above. 70 is activated carbon, 71 is a hollow fiber-free 1r' membrane, and 7 is an inorganic particle.

Claims (1)

[Claims] (1) A water purifier that is equipped with a hollow fiber membrane and activated carbon as water purification means, and is also equipped with a backwashing means that washes away foreign matter adhering to the water purification means by backflowing water, and is made of hollow fiber membranes. A water purifier characterized in that inorganic particles having a smaller particle size than activated carbon particles are arranged on the upstream side of a water purifying means.