JPH03127684A - Water purifier - Google Patents

Abstract

PURPOSE:To prevent the retention of bubbles in the porous membrane constituting the water purifier and to secure the effective membrane area or the flow rate of purified water by making the peripheral region of a water circulating port in each membrane and the peripheral region of a water outlet hydrophobic and the remaining region hydrophilic. CONSTITUTION:The pores of the porous membrane 23 in the hydrophilic region are closed by the deposited water, and the bubbles mixed in water are hardly passed through the pores. However, the peripheral region of the water circulating port 24 into which the flow around the membrane 23 is finally collected and the peripheral region of a water outlet 24B are made hydrophobic. Accordingly, the bubbles incapable of passing through the hydrophilic region of the membrane 23 and tending to stay around the membrane 23 are not retained, passed smoothly through the hydrophobic region 26 of the membrane 23 and discharged to the water outlet 24B side. The effective area of the membrane 23 is secured in this way, and consequently the flow rate of purified water is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water purifier used for purifying water such as well water and tap water.

[Prior Art] Conventionally, there is a water purifier in which a filtration part made of a plurality of laminated porous membranes is disposed between a water inlet part of a housing and a water ring part. As a result, the raw water introduced into the housing from the water inlet is captured and removed in the process of permeating from the outside to the inside of the porous membrane, becoming purified water and flowing out from the water ring.

At this time, in the water purifier, the porous membrane is made hydrophilic so that the raw water can smoothly permeate from the outside to the inside of the porous membrane even when the supply pressure of raw water is low. There is.

[Problems to be Solved by the Invention] However, the hydrophilized porous membrane has its bores blocked by water adhesion, making it difficult for air bubbles to pass from the outside to the inside of the core layer.

For this reason, in conventional water purifiers, air bubbles that tend to get mixed into the water introduced into the housing from the water introduction part are
Without passing through the porous membrane, it adheres to and accumulates on the outer surface of the porous membrane. The accumulated air bubbles gradually accumulate and increase as the water purifier is used.

This air bubble scavenging on the outer surface of the porous membrane impedes water permeation in that area, resulting in a loss of membrane effective area and, as a result, a reduction in the flow rate of purified water obtained by passing through the porous membrane.

The present invention aims to secure an effective membrane area and, as a result, a purified water flow rate, by preventing air bubbles from accumulating in a porous membrane, which is a major problem in water purifiers.

[Means for Solving the Problems] The present invention according to claim 1 provides a water purification system in which a filtration section formed by stacking a plurality of porous membranes is disposed between a water introduction section of a housing and a water ring mountain section. In the container, a portion of each porous membrane is made hydrophobic, and the remaining region is made hydrophilic.

The present invention according to claim 2 provides a method for stacking a plurality of filtration membrane units configured by sealing the peripheral edges of two porous membranes to each other in a housing provided with a water introduction part and a water ring mountain part. , the peripheries of the water flow ports provided in each of the adjacent porous membranes of the adjacent filter membrane units are sealed together, and the water outlet provided in the porous holes 'xg located in the most downstream layer is connected to the The water ring is connected to the water ring peak, and the water introduced into the housing from the water introduction part of the housing is permeated through each porous membrane, and the permeated water is guided from the water outlet to the water ring peak. In a water purifier, when each filtration membrane unit is stacked vertically in the vertical direction and used, the peripheral area of the water flow opening and the peripheral area of the water outlet in each porous membrane are made hydrophobic, and the remaining area is made hydrophilic. This is what I did.

The present invention according to claim 3 provides a method for stacking a plurality of filtration membrane units configured by sealing the peripheral edges of two porous membranes to each other in a housing provided with a water introduction part and a water ring mountain part. , the peripheries of the water flow openings provided in each of the adjacent porous membranes of the adjacent filtration membrane units are sealed together, and the water outlet provided in the porous membrane located in the most downstream layer is connected to the bottom of the housing. Water purification configured to communicate with the outlet part, to allow water introduced into the housing from the water inlet part of the housing to permeate through each porous membrane, and to guide this permeated water from the water outlet to the water ring mountain part. When the filtration membrane units are stacked horizontally in the device, a part of the vertical upper edge side of each porous membrane is made hydrophobic, and the remaining area is made hydrophilic.

[Action] According to the present invention as set forth in claim 1, there is the following effect (2).

■Water introduced into the housing from the water introduction part smoothly passes through the hydrophilic areas of the porous membrane located from the upstream side to the downstream side from the outside to the inside, and bacteria etc. are removed in the process. The water becomes purified.

At this time, the hydrophilic region of the porous membrane has its bore blocked by the adhesion of water, and does not easily allow air bubbles mixed in the water to pass through. The portion is a hydrophobic region through which air bubbles can easily pass. Therefore, the bubbles that appear to accumulate around the outer surface of the porous membrane without being able to pass through the hydrophilic area of the porous membrane do not accumulate and smoothly pass through the hydrophobic area of the pores 'xg. and is discharged to the water outlet side.

Thereby, the membrane effective area of the porous membrane constituting the water purifier can be ensured, and as a result, the purified water flow rate can be ensured.

According to the present invention as set forth in claim 2, there is the following effect (2).

■Water introduced into the housing from the water introduction part flows vertically upward around the filtration membrane unit, and smoothly permeates the hydrophilic area of the porous membrane located from the upstream side to the downstream side from the outside to the inside. In the process, bacteria etc. are removed and the water becomes purified.

At this time, the bores of the hydrophilic region of the porous membrane are blocked by water adhesion, and air bubbles mixed in the water do not easily pass through.

However, in the porous membrane of the present invention, the peripheral region of the water flow opening and the peripheral region of the water groove outlet, where the flow around the pores finally concentrates, are made hydrophobic. Therefore, the bubbles that appear to accumulate around the outer surface of each porous membrane without being able to pass through the hydrophilic area of the porous membrane do not accumulate and pass through the hydrophobic area of the porous membrane. It passes through smoothly and is discharged to the water outlet side. Thereby, the effective area of the porous membrane constituting the water purifier can be secured, and as a result, the flow rate of purified water can be secured.

According to the present invention as set forth in claim 3, there is the following effect (2).

■Water introduced into the housing from the water introduction part flows horizontally around the filtration membrane unit, and smoothly flows through the hydrophilic areas of the porous membrane located from the upstream side to the downstream side from outside to inside. It passes through the water, and in the process, bacteria etc. are removed and the water becomes purified.

At this time, the hydrophilic region of the porous membrane has its bores blocked by the adhesion of water, and air bubbles mixed in the water cannot easily pass through.However, the porous membrane of the present invention has
A partial region on the vertical upper edge side where the air bubbles existing around the porous membrane eventually concentrate due to buoyancy is made hydrophobic.

For this reason, the air bubbles that appear to accumulate around the outer surface of each porous membrane without being able to pass through the hydrophilic region of the porous membrane,
The water passes smoothly through the hydrophobic region of the porous M membrane and is discharged to the water outlet side. As a result, the effective surface area of the hollow fiber membranes constituting the water purifier can be ensured, and as a result, the flow rate of purified water can be ensured.

In carrying out the present invention, the following (A) (B) (C)
) can be adopted.

(^) The entire surface of the porous 'rim located in the most downstream layer is made into a hydrophobic region.

According to this, water does not have a chance to pass through the hydrophobic regions provided in each porous membrane located from the upstream side to the downstream side, and the water flows through the porous membrane in the most downstream layer. The air bubbles that have reached the surrounding area can be extremely smoothly and immediately discharged to the water outlet side from the hydrophobic region provided on the entire surface of the porous 'itwA of the most downstream layer. (B) In addition to the above (A), the most upstream layer The entire surface of the porous membrane located in the layer is a hydrophobic region.

According to this, air bubbles mixed in the water introduced into the housing from the water introduction part are quickly discharged by the hydrophobic porous membrane in the uppermost layer, and as a result, the remaining air bubbles that are not discharged here are It is sufficient to discharge only a relatively small amount of bubbles from the hydrophobic region provided in each porous membrane on the downstream side as described above, and all the bubbles mixed in the water can be discharged more reliably.

(C) The pore size of the hydrophobic region of the porous membrane is made smaller than the pore size of the hydrophilic region. In addition, the above (A) (B)
In this embodiment, the pore size of the hydrophobic pores 'am located in each of the most downstream layer and the most upstream layer is made smaller than the pore size of the other hydrophilic pores T131m.

According to this, since the pore size of the hydrophobic region of the porous membrane is smaller than that of other hydrophilic regions, the bubble point (minimum pressure of the pressure fluid that allows the pressure fluid to pass) is large.

By the way, when water is allowed to pass through a hydrophobic layer when the water pressure exceeds the bubble point, its bores continue to be blocked by water, and as a result, it becomes an apparently hydrophilic membrane that does not allow bubbles to pass through unless the water stops. .

However, by setting the bubble point in the hydrophobic region of the porous membrane to a value higher than the water supply pressure (water pressure) of the raw water, its hydrophobicity can be maintained and bubbles can always easily pass through. becomes.

For example, the bubble point for a pore size of 0゜lμ in the hydrophobic region is 3.0 kg/bat, and the bubble point for a pore size of 0.45 μ in the hydrophilic region is 1.6 kg.
/rn”.

[Example] Fig. 1 is a sectional view schematically showing a stationary water purifier as a first embodiment of the present invention, Fig. 2 is a sectional view taken along the If-If line in Fig. 1, and Fig. 3 is a sectional view schematically showing a stationary water purifier as a first embodiment of the present invention. 1 is a cross-sectional view taken along line ■-■, FIG. 4 is a schematic diagram showing a faucet-mounted water purifier as a second embodiment of the present invention, and FIG. 5 is a schematic diagram of the water purifier shown in FIG. 4. 6 is an end view taken along the line Vl--Vl in FIG. 5, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, and FIG. 8 is a cross-sectional view taken along the line ■-dotted in FIG. 9 is a cross-sectional view taken along IX-IX in FIG. 5.
It is a sectional view along a line.

(First Embodiment) As shown in FIG. 1, the sweat dispenser 10 is a stationary type, and includes a switching frame 13 provided on a faucet 12 made of laminated water pipes, and this switching frame 1.
3, and a water purification cartridge 15 that is detachably connected to the water conduit 14.

The switching frame 13 has two modes: ■ A water purifier usage mode in which running water from the laminated water pipes flows out from the faucet 12 via the water purification cartridge 15, and ■ A water purification mode in which running water from the laminated water pipes flows out from the faucet 12 without passing through the sweat cartridge 15. You can switch to either mode when the device is not in use.

The water pipe 14 transports the flowing water from the water pipe stack to the water purification cartridge 1.
5, and a water ring outlet path 17 that leads purified water that has passed through the water purification cartridge 15 to the faucet 12.

The water purification cartridge 15 has inside the housing 15A,
A plurality of (two in this embodiment) water purification units 18 are arranged in parallel. Each water purification section 18 is of a vertical type, and has a water introduction section 16A.
A lower adsorption part 19 connected to the water inlet passage 16 via the water ring and an upper filtration part 20 connected to the water ring output passage 17 via the water ring peak part 17A are coupled so as to be vertically stacked on each other.

The adsorption section 19 is constructed by stacking a plurality of (15 in this example) disc-shaped adsorbents 21 (in this example, the diameter of the disc is 44 cm and the thickness is 5 mm) one above the other. It adsorbs and removes odors and organic substances from the water introduced from the introduction part 16A. The adsorbent 21 located at the bottom layer of the adsorption section 19 is connected to the water introduction section 16A. That is, the water introduction section 16
The raw water supplied from A flows through each adsorbent 21 of the adsorption section 19, and in the process, odors and the like are removed as described above.

The adsorbent 21 is configured by accommodating fibrous activated carbon or antibacterial-treated activated carbon in the inner core of a liquid permeable member made of woven fabric, nonwoven fabric, or porous material.

In this embodiment, the activated carbon used is fibrous activated carbon with a coal pitch diameter of 7 to 16 μm in fiber diameter and 7 g in specific surface area of 500 to 250 hours.

As shown in FIG. 3, the filtration section 20 is constructed by stacking a large number of disc-shaped filtration membrane units 22 (45 sets in this example) vertically, and the filter unit 20 passes through the adsorption section 19. This process removes bacteria, fungi, and other fine foreign substances contained in the water after removing odors, etc. from the raw water. The filtration membrane unit 22 includes two porous membranes 23 (23A, 23B) having the same diameter.
) whose peripheries are sealed to each other and their porous 'EflI
A water flow port 24 is provided in the center of the filter membrane unit 23, and the peripheral edges of the water flow ports 24 of adjacent filtration membrane units 22 are also sealed and joined to each other at a seal portion 24A.

Moreover, the filtration membrane unit 22 includes two porous membranes 23A, 2
3B, the porous membranes 23A, 23B
A disc-shaped flow path forming member 25 is provided to form a water flow path therebetween. The filtration membrane unit 22 located at the lowest layer (most upstream layer) of the filtration section 20 is connected to the upper part of the adsorption section 19, and the porous membrane 23A on the side of the filtration membrane unit 22 that is in contact with the adsorption section 19 is water-resistant. It has no flow port 24 and is completely closed. In addition, the uppermost layer of the filtration section 20 (most downstream pl
) The filtration membrane unit 22 located at ) is connected to the water ring mountain part 17A, and the water flow port 24 provided in the porous '1fi 23B on the side connected to the water ring mountain part 17A of the filtration membrane unit 22 functions as the main exit 24B, and this main exit The periphery of the water ring 24B is fluid-tightly crimped or adhered to the periphery of the water ring crest 17A. That is, the water after passing through the adsorption section 19 passes through the filtration section 2.
Porous membrane 23 constituting each filtration membrane unit 22 of 0
The water permeates from the outside to the inside, and in the process, bacteria and the like are removed as described above, resulting in purified water. Then, this purified water passes through the water flow port 24 provided in the center of the porous JII 23 constituting each filtration membrane unit 22, thereby penetrating the inside of the upper filtration membrane unit 22 one after another. , the main outlet 2 provided in the filtration membrane unit +)-22 of the most downstream layer.
4B to the water ring mountain portion 17A.

Porous membrane 2 of the filtration membrane unit 22 that constitutes the filtration section 20
3 has a pore diameter of 0.01 to 1.0μ, a porosity of 30 to 90%,
The film thickness is preferably within the range of 30 to 300 μm.

Here, the pore size means that when a solution containing particles of known particle size (I quasi-polystyrene latex, etc.) is filtered, the particle size is 95%.
% or more. Porosity is the volume of pores/
This is a value expressed as the volume of the entire film x 100%.

In addition, synthetic resin is mainly used as the material for the porous membrane 23, and in particular, when the material is polyolefin or polyolefin in which the - portion is halogenated, the physical properties of the membrane do not deteriorate even when used for a long time, which is preferable. Other examples include polyethylene, polypropylene, polyvinylidene fluoride, polyvinylidene chloride, and chlorinated polyethylene.

Also, porous J! I23 is a porous membrane subjected to hydrophilic treatment. In addition, hydrophobic pores 1! Hydrophilic methods for making the membrane into a hydrophilic porous membrane include coating methods with hydrophilic polymers or surfactants, graft polymerization methods, chemical treatment methods, and the like.

In addition, in the porous wA 23 that has been subjected to the above-mentioned hydrophilic treatment, the water flow opening 24 and the main outlet 24 in each porous membrane 23 are
The outer circumferential area of the seal part 24A provided on the periphery of B is secured as a hydrophobic area 26, so that it is possible to prevent air bubbles mixed in the water that has passed through the adsorption part 19 from accumulating on the outer circumference of the seal part 24A. (See Figure 2).

An example of the method for manufacturing the porous membrane 23 will be described below.

(1) Polypropylene (degree of polymerization 1200) 100
Per part by weight: 400 parts by weight of liquid paraffin (number average molecular weight 324) and 1,3,2.4- as a crystal nucleating agent.
0.3 parts by weight of bis(paraethylbendisodene)sorbitol was added to a twin-screw extruder (PCM-30 manufactured by Ikegai Iron Works Co., Ltd.).
The mixture was melt-kneaded, extruded, and pelletized. This pellet was melted at 180°C using the same extruder and extruded into the air at a rate of 200g/min through a T-die with a slit width of 0.6mm, and a cooling roll with a surface temperature of 35°C was installed at the bottom of the pellet. After being cooled and solidified, it was wound up on a winding roll. The rolled sheet material was cut into a rectangle of 13hm x 250mm, fixed vertically and horizontally, and placed in 1,1,2-trichloro-1,2,2-)-refluoroethane at a liquid temperature of 25°C for 10 minutes. Liquid paraffin was extracted by dipping twice for 1 minute, and then heat treatment was performed in air at 135°C for 2 minutes. The obtained polypropylene porous membrane had a bubble point of 1.1 kg/cm, an average pore diameter of 0.5 μ, and a p
The lA thickness was 130μ.

(2) Next, in order to make the hydrophobic porous membrane obtained in (1) above hydrophilic, the polypropylene porous MIN was subjected to electron acceleration II.
After electron beam irradiation using (pressure voltage 1.5 MeV, electron gun current 1 mA), it was immersed in a solution consisting of N, 10 parts by weight of dimethyl achnoethyl acrylate, and 90 parts by weight of acetone, and heated at 500 C for 30 minutes. Graft polymerization was performed. The obtained membrane was washed with methanol for 40 hours and then dried. At this time, only the portion of the porous polypropylene membrane that was immersed in the solution and subjected to graft polymerization becomes hydrophilic, so by controlling the immersion range, some areas of the porous membrane can be made hydrophobic as described above. It becomes possible to leave it as area (26).

Furthermore, the surface of the membrane 23 having the pores 1 may be flat;
Alternatively, it may be formed by forming a plurality of microprotrusions on one surface of at least six porous wA 23. In the case where a plurality of microprotrusions are formed on the surface of the porous wA 23, the adjacent filtration membrane unit 2
The surfaces of the two opposing porous membranes 23 are prevented from coming into close contact with each other, and a water flow path can be ensured between the opposing porous ffas 23. As a method for forming microprotrusions on the surface of the porous membrane 23, for example, when forming a film by solidifying an unsolidified stock solution in the shape of a flat film, at least one of the unsolidified stock solutions in the shape of a flat film is formed. A plurality of microprotrusions can be formed on at least one surface of the permeable membrane by solidifying the surface while contacting a mold surface having a plurality of microscopic depressions.

The flow path forming member 25 of the filtration unit 22 constituting the filtration unit 20 may be a screen mesh, a nonwoven fabric, a perforated plate with protrusions on the surface, or the like.

Furthermore, as the material for the flow path forming member 25, synthetic resin is mainly used, such as polyethylene, polypropylene, etc.

In the water purifier 10, when the switching valve 13 is set to the water purifier usage mode, the raw water from the water pipe stack is passed from the water introduction path 16 of the water guide pipe 14 to the water introduction part 16A of the water purification cartridge 15 to the adsorption part 19. Introduce.

The raw water flows into the filtration section 29 after odor and the like are removed in the process of flowing through each adsorbent 21 of the adsorption section 19 . Filtration section 2
In the process of passing through the porous membranes 23 constituting each filtration membrane unit 22, the water that has flowed into the filter unit 22 becomes purified water by removing bacteria, etc., and passes through the water ring mountain part 17A and the water ring outlet 17 of the water conduit 14 to the faucet 12. flows out from

However, this water purifier 10 has the following effects.

Water introduced from the adsorption section 19 to the filtration section 20 flows vertically upward around the filtration membrane unit 22, and flows through the hydrophilic regions of the porous membrane 23 located from the upstream side to the downstream side from the outside to the inside. It passes through the water smoothly, and in the process, bacteria and other substances are removed, resulting in purified water.

At this time, the bores of the hydrophilic region of the porous @23 are blocked by the adhesion of water, and air bubbles mixed in the water do not easily pass through.

However, in the porous WA 23, the peripheral area of the water flow opening 24 and the peripheral area of the main outlet 24B, where the flow around the porous membrane 23 ultimately concentrates, are made hydrophobic. For this reason, the bubbles that appear to accumulate around the outer surface of the pores 'If*23 without being able to pass through the hydrophilic region of each porous wA23 do not accumulate and instead It passes smoothly through the sex area 26 and is discharged to the main exit 24B. Thereby, the membrane effective surface area of the porous membrane 23 constituting the water purifier 10 can be ensured, and as a result, the purified water flow rate can be ensured.

(Second Embodiment) As shown in FIGS. 4 and 5, the water purifier 30 is of a faucet-mounted type, and includes a switching faucet 33 provided on a faucet 32 of a water pipe 31,
It is configured to include a water guide block 34 connected to this switching valve 33 and its lid 34A, and a water purification cartridge 35 detachably connected to this water guide block 34.

The switching valve 33, like the switching valve 13 of the water purifier 10, can be switched between the @water purifier use mode and the water purifier non-use mode.

The water guide block 34 has a water inlet path 36 and a water ring outlet path 37 similarly to the water guide pipe 14 of the water purifier 1o.

The water purification cartridge 35 includes inside the housing 35A,
A water purification section 38 is provided. The water purification section 38 is of a horizontal type, and includes an adsorption section 39 on the left side that is connected to the water introduction path 36 via the water introduction section 36A, and a filtration section 40 on the right side that is connected to the water ring outlet path 37 via the water ring mountain section 37A. are connected to each other.

The adsorption unit 39 is configured substantially the same as the adsorption unit 19 of the water purifier 10, and contains an adsorbent 4 similar to the adsorbent 21 of the water purifier 1o.
1 are stacked horizontally. That is, like the adsorbent 21, the adsorbent 41 is configured by accommodating activated carbon in a liquid-permeable member.

The filtration unit 40 is configured substantially the same as the filtration unit 2o of the water purifier 10, and horizontally logs a filtration membrane unit 42 similar to the filtration membrane unit 22 of the water purifier 1o. That is,
The filtration membrane unit 42 includes two porous membranes 43 (
43A, 43B) are sealed to each other, and a water flow port 44 is provided in the center of the porous 'piWA43,
Further, adjacent water flow ports 4 of adjacent filtration membrane units 42
The peripheries of 4 are also sealed and joined to each other at the seal portion 44A. In addition, the filtration membrane unit 42 includes two porous membranes 4
3A and 43B, and the porous Jl14
A disc-shaped flow path forming member 45 is provided to form a water flow path between 3A and 43B. The filtration membrane unit 42 located in the most upstream layer of the filtration part 40 is connected to the side of the adsorption part 39, and the porous '1ra43A of the filtration membrane unit 42 on the side in contact with the adsorption part 39 connects the water flow port 44. It is completely blocked without any preparation. Further, the filtration membrane unit 42 located at the most downstream layer of the filtration section 40 is connected to the water ring mountain section 37A,
The water flow port 44 provided in the porous hole 1tfi 43B on the side connected to the water ring mountain portion 37A of the filtration membrane unit 42 is the water groove outlet 4.
4B, and the peripheral edge of this water groove outlet 44B is fluid-tightly pressed or adhered to the peripheral edge of the water ring crest 37A.

Like the porous material 1i23, the porous 'MWA43 is mainly formed of synthetic resin and is used after being subjected to a hydrophilic treatment.

In addition, in the porous WA 43 that has been subjected to the hydrophilic treatment described above, a part of the vertical upper edge side of each porous laminated layer 43 is secured as a hydrophobic region 46, and water that has passed through the adsorption section 39 is mixed in. This makes it possible to prevent air bubbles from accumulating around the vertical upper edge of the porous membrane 43 (see Fig. 9).
.

Furthermore, it is preferable that the porous layer Q43 has a plurality of microprojections formed on its surface, similar to the porous J layer 23.

The flow path forming member 45 has the same form as the flow path forming member 25,
Composed of material.

In the water purifier 30, a release valve 47 is provided on the wall surface of the housing 35A of the water purification cartridge 35 on the side that is attached to the water guide block 34. The release valve 47 (1) closes the release port 48 communicating with the suction section 39 with a ball valve 50 backed up by a spring 49, and (2) closes the ball valve 50 in the opening direction due to the abnormally high internal pressure of the suction section 39. In the moving state, the release port 48 is opened to release the internal pressure of the adsorption section 39. Thereby, the release valve 47 protects the adsorption section 39, the filter section 40, and the housing 35A from damage.

In the water purifier 30, when the switching valve 33 is set to the water purifier use mode, raw water from the water pipe 31 is transferred from the water introduction path 36 of the water guide block 34 to the water introduction part 36 of the water purification cartridge 35.
The liquid is introduced into the adsorption section 39 via A. After the raw water has odor etc. removed in the process of passing through each adsorbent 41 of the adsorption part 39,
It flows into the filtration section 40. The water that has flowed into the filtration section 40 is purified in the process of passing through the porous giWA 43 constituting each filtration membrane unit 42, removing bacteria, etc., and passing through the water ring mountain part 37A and the water ring outlet 37 of the water guiding block 34 to the faucet. 3
It flows out from 2.

However, this water purifier 30 has the following effects.

The water introduced from the adsorption section 39 to the filtration section 40 flows horizontally around the filtration membrane unit 42 and smoothly flows through the hydrophilic regions of the porous WA 43 located from the upstream side to the downstream side from the outside to the inside. In the process, bacteria etc. are removed and the water becomes purified. At this time, the hydrophilic region of the porous pore 'fl@43 is blocked by the adhesion of water.
Does not allow air bubbles mixed into the water to pass through easily.

However, in the porous laminated layer 143, a partial region on the vertical upper edge side where the air bubbles existing around the porous layer 143 eventually concentrate due to buoyancy is made hydrophobic. Therefore, the porous stack I43 cannot pass through the hydrophilic region of each porous @43.
The air bubbles that appear to accumulate around the outer surface of the pores smoothly pass through the hydrophobic region 46 of the porous 1tll 143 and are discharged to the water groove outlet 44B side. Thereby, the membrane effective area of the porous membrane 43 that constitutes the water purifier 30 can be secured, and as a result, the purified water flow rate can be secured.

Incidentally, in each of the water purifiers 10 and 30, the configuration described in (Al-(C)) of [Operation] can also be adopted.

[Effects of the Invention] As described above, according to the present invention, by preventing air bubbles from accumulating in the porous membrane constituting the water purifier, an effective area for wear can be ensured, and as a result, a purified water flow rate can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view schematically showing a stationary water purifier as a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. 4 is a schematic diagram showing a faucet-mounted water purifier as a second embodiment of the present invention; FIG. 5 is a sectional view schematically showing the water purifier shown in FIG. 4; 6 is an end view taken along the line Vl--Vl in FIG. 5, FIG. 7 is a sectional view taken along the line ■--■ in FIG. 6, and FIG.
9 is a cross-sectional view taken along the line -■, and FIG. 9 is a cross-sectional view taken along the line -f in FIG. 10.30-...Water purifier, 15.35...Water purification cartridge, 15A, 35A...Housing, 16A, 36A...Water introduction part, 17A, 37A...Water ring mountain part, 22.42- ...Filtration membrane unit, 23.43...Porous membrane, 24.44...Water flow port, 24B, 44B...Water outlet, 26.46...Hydrophobic region.

Claims (3)

[Claims] (1) In a water purifier in which a filtration part formed by stacking a plurality of porous membranes is disposed between a water inlet part and a water outlet part of a housing, a part of each porous membrane is made hydrophobic, A water purifier characterized by making the remaining region hydrophilic. (2) In a housing equipped with a water inlet and a water outlet,
When stacking a plurality of filtration membrane units configured by sealing the peripheries of two porous membranes to each other, They are sealed together, and a water outlet provided in the porous membrane located in the most downstream layer is communicated with the water outlet part of the housing, and the water introduced into the housing from the water inlet part of the housing is passed through each porous membrane. In a water purifier configured to allow permeated water to permeate through a porous membrane and guide the permeated water from the water outlet to the water outlet, when each filtration membrane unit is stacked vertically in the vertical direction, the water in each porous membrane is A water purifier characterized in that a peripheral area of a flow opening and a peripheral area of a water outlet are made hydrophobic, and the remaining area is made hydrophilic. (3) In a housing equipped with a water inlet and a water outlet,
When stacking a plurality of filtration membrane units configured by sealing the peripheries of two porous membranes to each other, They are sealed together, and a water outlet provided in the porous membrane located in the most downstream layer is communicated with the water outlet part of the housing, and the water introduced into the housing from the water inlet part of the housing is passed through each porous membrane. In a water purifier configured to allow permeated water to permeate through a porous membrane and guide the permeated water from the water outlet to the water outlet, when each filtration membrane unit is stacked horizontally, the vertical A water purifier characterized in that a part of the veranda area is hydrophobic and the remaining area is hydrophilic.