JPH03186A - Water purifier - Google Patents

Abstract

PURPOSE:To obtain the water purifier in which microbes are not propagated and having a purification tank from which the packing is not discharged and a microfilter with the clogging reduced by providing a water purifying tank packed with a water purifying material and having a heater between the first and second microfilters. CONSTITUTION:The water purifier 1 consists of a first tank filter 3 contg. the first microfilter 2, a water purifying tank 5 packed with a purifying material 4, a second tank filter 7 contg. the second microfilter 6 and a heater 8. An inlet 10 for raw water 9 and a bypass 11 are provided to the first tank filter 3. Raw water is introduced into the water purifier and filtered by the first microfilter to remove the fine particles, microbes, etc., in the raw water. The harmful material such as chlorine and trihalomethane is adsorbed and removed by the purifying material in the water purifying tank, and the raw water is finally filtered by the second microfilter and discharged from the water discharge port 13. The water in the water purifier is heated for a specified time by the heater, and the water staying between the first and second filters is sterilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to water purifiers for home and commercial use. In particular, this relates to water purifiers that use microfilters that can reliably separate purification materials such as adsorbents and ion exchangers from fine particles with a size of several tens of microns or less, reducing the possibility of microbial growth in the water purification tank. The present invention aims to provide a water purifier in which the contents of the water purifying tank are not washed away and the microfilter is less likely to be clogged.

[Background Art] In recent years, the population has been concentrated in cities, while rural areas have been depopulated. In this social situation, the subcommittee's water purification facilities are only purifying the water to the limit that it can be used as drinking water because the raw water from the rivers is polluted, and the quality of tap water continues to decline year by year. is the current situation. In addition, in high-rise buildings, city water is often pumped up to a high place and temporarily stored in a water storage tank before use, and it has been reported that various types of pollution occur during storage.

In order to improve the quality of drinking water in homes, etc., water purifiers are attached to individual faucets to eliminate fine particles, rust, chlorine, trihalomethane, etc. from drinking water. is trying to remove harmful substances.

[Problems to be solved by the invention] However, currently commercially available water purifiers introduce raw water that has passed through a microfilter into a water purification tank filled with adsorbent such as activated carbon to remove harmful substances such as triheromethane and chlorine. Most of the water is dispensed from the faucet or only uses a water purification tank. With this kind of product, sterilizing agents such as chlorine are removed in the water purification tank, so the water that passes through it has no sterilizing effect.

For this reason, the area after the water purification tank becomes an environment in which microorganisms that have invaded the water can easily breed, causing a phenomenon in which the number of microorganisms increases in the water purifier that purifies the water, which has become a problem. In particular, purification materials such as adsorbents are extremely favorable for the growth of microorganisms, so in order to prevent this, purification materials that have antibacterial properties that prevent the growth of microorganisms, such as silver activated carbon, are used. be. However, even in this case, it is difficult to completely suppress the growth of invading microorganisms, and many of the substances that basically have antibacterial effects are toxic, and there is a problem in the elution of the substances themselves.

A microfilter installed after the purification material part can prevent the microorganisms themselves from leaking out, but it cannot prevent the leakage of bacterial cell residue and eluted substances derived from the microorganisms, and is not sufficient from a safety point of view.

In addition, there are water purifiers that use ultraviolet irradiation to sterilize water, but since ultraviolet rays are light, they do not reach the shadows of adsorbents such as activated carbon, so the drawback is that the sterilization effect is only partially achieved6. Products that only use purifying materials such as strong absorbents,
There is a problem that the purification material itself leaks out.

In addition, water purifiers using microfilters have the problem that the filtration flow rate decreases as they are used due to clogging of the microfilters, etc., but at present, in most cases this can be solved by replacing the microfilters.

The present invention solves the problems seen in current water purifiers, namely, the proliferation of microorganisms within the water purifier, and the use of antibacterial substances that are likely to be harmful to living organisms in order to prevent the proliferation of microorganisms. This product aims to provide a safe water purifier that is always less likely to breed microorganisms without using any harmful substances, and it also prevents the filling of the water purification tank from being washed away and prevents the microfilter from clogging. It is intended to provide a water purifier for a small amount.

[Means for solving the problem] The water purifier of the present invention includes a first filtration tank in which a first microfilter is installed and a second microfilter! A water purification tank filled with a water purification material such as activated carbon or an ion exchanger is sandwiched between the water purification tank and the second filtration tank, and a heating device is further provided near the water purification tank. Further, immediately before the water introduced from the water inlet provided in the first filtration tank passes through the first microfilter, the water is removed from the first filtration tank without passing through the first microfilter. The first filtration tank is provided with a bypass flow path through which the first filtration tank can flow out.

With this configuration, it is possible to provide a safe water purifier in which there is little possibility that microorganisms will always propagate, the filling in the water purification tank is not washed away, and the microfilter is less likely to be clogged.

[Effect] Fig. 1 shows a diagram of the principle of the water purifier of the present invention [7].

The water purifier 1 has four parts: a first filtration tank 3 in which a first microfilter 2 is installed, a water purification tank 5 filled with a purifying material 4, a second filtration tank 7 in which a second microfilter 6 is installed, and a heating device 8. It is mainly composed of parts. Furthermore, an inlet 10 for raw water 9 and a bypass flow path 11 are formed in the first filtration tank 3 .

A stop valve 12 is installed in the bypass channel 11 . The raw water 9 introduced into the water purifier 1 is first filtered by the first microfilter 2 to remove particulates, microorganisms, etc. from the raw water. Next, harmful substances such as chlorine and trihalomethane contained therein are adsorbed and removed by the purification material 4 in the water purification tank 5, and then finally filtered by the second microfilter 6, and the water flows out from the purification outlet 13. Now,
The effect of preventing the proliferation of microorganisms in the water purifier, which is one of the features of the water purifier of the present invention, can be achieved as follows.

A water purifier configured as described above is installed, and the first filtration tank 3,
The introduction of raw water is stopped when raw water is introduced into the water purification tank 5 and the second filtration tank 7 in this order, and then the water in the water purifier is heated for a certain period of time by the heating device 8 and remains between the first and second microfilters. Heat and sterilize the water. Furthermore, by heating the accumulated water, microorganisms in the purification material and attached to the microfilter are also sterilized. In this way, the inside of the water purification tank can be sufficiently sterilized without using antibacterial agents or sterilizers, and the problem of microbial growth that is seen in current water purifiers can be solved. be.

Heat sterilization of microorganisms, especially mold and general bacteria, is generally carried out at temperatures above 100°C, but in reality, heating at temperatures above 50°C for long periods of time will inhibit the growth of general bacteria and mold in the water, which will interfere with the use of drinking water. It is good as long as the water temperature can be kept to a level where there is no water, and at least the water purification tank can be maintained at this temperature. Oil-free 5
If the heating temperature is higher than 0℃, the prevention of microbial growth and sterilization effect will be higher, but excessive heating may cause damage to the material of the water purifier,
It would be practical to carry out the process at a temperature below 90°C, which is undesirable since it may limit the structure or damage the filter.

It is not necessary to perform the heating all the time, but the minimum goal can be achieved if it is performed when a water purifier is installed, when the adsorbent is replaced, or when the system has not been used for a long period of time.

Furthermore, by using a timer or the like that can set the heating time, the heating device can be automatically operated when the water purifier is not in use, for example at night. In this way, it is easy to do it every day.

The size of the micropores of the microfilter is not particularly limited as long as it can remove the particulates that you want to remove from the raw water, but the present invention aims to prevent the growth of microorganisms in the water purifier. In order to more reliably and effectively realize this purpose, it is desirable that the actual pore diameter be 0.45 μm or less, which is considered to be substantially impermeable to general bacteria. By doing this, in addition to preventing the growth of microorganisms inside the water purifier by heat sterilization, it also prevents new microorganisms from entering the water purifier, thereby preventing the generation of microorganisms inside the water purifier. It can be extremely effectively, efficiently and reliably prevented.

In this case, it is not necessary to heat the water purification tank every day, but it can be done when replacing the adsorption tank, or at regular intervals such as once a week.

In addition, from the point of view of removing particulates in raw water, the smaller the diameter of the microfilter, the better. Compared to the micro filter 6, it becomes clogged more quickly. There are two types of this blockage.
A phenomenon that occurs when particles enter the micropores that are the liquid flow part of the microfilter, and a phenomenon that occurs when particles accumulate on the surface of the microfilter and cause concentration polarization, resulting in the inability of liquid to pass through the microfilter. There is something like that. The clogging caused by the latter is not a phenomenon in which the fluid flow part in the micropores of the microfilter is clogged.
This clogging can be resolved by removing deposited substances such as fine particles that form concentration polarization from the microfilter surface. Therefore, immediately before the raw water 9 introduced into the first filtration tank 3 of the water purifier 1 passes through the first microfilter 2,
A bypass channel 11 is provided that allows water to flow out of the first filtration tank 3 without passing through the microfilter 2.

A stop valve 12 is installed in the bypass channel 11 . During normal use, this stop valve 12 is closed.

When clogging occurs on the surface of the first microfilter 2, the stop valve 12 is opened and the raw water 9 is transferred to the bypass channel 1.
From 1, it is discharged to the outside of the water purifier. The water pressure of the raw water introduced at this time can remove the concentration polarization on the surface of the first microfilter 2, and the filtration ability of the first microfilter can be restored. It is also preferable to operate the stop valve 12 using a timer or the like to automatically open and close the bypass channel 11. In this case, there is no need to pay particular attention to removing the blockage in the first microfilter. .

The material of the microfilter may be any material, such as inorganic materials such as ceramics or materials composed of various synthetic polymers, as long as it can safely perform filtration that achieves the above purpose. In particular, synthetic polymers are preferred because microfilters can be manufactured with a uniform structure and of stable quality at low cost.

As for the structure of the microfilter, any structure can be used, such as one made of hardened fine particulate material, one made of thread-like material tightly intertwined, or a filtration membrane with uniformly drilled fine holes. is possible.

In particular, the filtration membrane is preferable because the size of the fine pores is well controlled, and the filtration material constituting the microfilter does not peel off and flow out.

Filtration membranes can have a variety of structures, such as folded flat plates into pleats, tubes, and hollow fibers, but hollow fibers are particularly preferred. Since hollow fiber filtration membranes have a large filtration area per unit volume, the area of the microfilter can be made larger in a water purifier of the same size, and a membrane with a smaller pore size can be used without reducing the filtration rate. be able to. In addition, when microfilters with the same pore size are used, a water purifier that has a large filtration amount and can be used for a long period of time can be produced. In addition, when trying to obtain the same filtration amount, the volume is smaller than using other microfilters with the same pore size, so the size of the microfilter and, by extension, the size of the water purifier can be made more compact. It is preferable to use it for at least either the first or second microfilter.

Purification materials used to purify raw water include adsorbents such as activated carbon and ion exchangers, and can adsorb and remove harmful impurities in raw water such as corals and natural minerals, as well as add appropriate useful inorganic components. Various purification materials can be used.

EXAMPLES The present invention will be described in detail below with reference to Examples, but the Examples are not intended to limit the present invention.

[Example] Figure 2 shows a first example of the water purifier of the present invention, in which hollow fiber filtration membranes are used as the first and second microfilters, and activated carbon is used as the purifying material. . The first microfilter 20 includes a hollow fiber filtration membrane 21 and a housing 22.
Cap body 23 and fixing resin 24 that holds and fixes each
The first filtration tank 25 serves as a filtration cartridge.
It is installed in The first filtration tank 25 includes a base portion 26,
It is composed of a lid body 27.

The second filtration tank 30 similarly consists of a base portion 26 and a lid 27, and a second microfilter 31 having the same structure as the first microfilter 20 is installed inside. 1st
A water purification tank 32 is installed between the filtration tank 25 and the second filtration tank 30, and a purification material cassette 34 filled with activated carbon 33
is set. The purification material cassette 34 is the water purification tank 32
It is set so as to be dropped from the top of the tank, and is held and fixed by closing the lid 35 of the water purification tank. A cylindrical heater 36 serving as a heating device is installed in the center of the lid 35 of the water purification tank.
When the lid 35 of the water purification tank is closed, the purification material cassette 3 is removed.
It is inserted into the center of 4 as shown in the figure.

When using purified water, the raw water 38 is first passed from the raw water inlet 37 to the
It is introduced into the filtration tank 25 and filtered by the first microfilter 20. The generated primary filtrated water 39 enters the water purification tank 32 and passes through the part filled with activated carbon 33 from the bottom of the purification material cassette 34, where harmful components contained therein are adsorbed and removed. The adsorption purified water 40 is then introduced into the second filtration tank 30, filtered by the second microfilter 31, and flows out from the water purifier as secondary filtrated water 41. When necessary, such as when raw water 38 is introduced for the first time or when the purification material cassette 34 is replaced, the water purification tank is heated by a heater 36 installed in the water purification tank, and left unused while being heated for a certain period of time. Use this water purifier from When the first microfilter 20 becomes clogged and the filtration capacity decreases, the raw water 38 is caused to flow out through the bypass channel 42 provided in the first filtration tank 25 to wash out particulates etc. that have accumulated on the surface of the first microfilter. It has become. Opening of the bypass flow path 42, opening time, etc. are performed by controlling an electric valve 43 installed in the bypass flow path.

Heating of the heater 36 and operation of the electric valve are performed by a control switch 44 installed in the water purifier body. still,
The control switch 44 is also used to automatically set these operations using a timer or the like.

The purification material cassette 34 can be easily replaced by removing the set screw 45 of the water purification tank lid 35, removing the water purification tank lid 35, and pulling out the purification material cassette 34 upward. Furthermore, the first and second microfilters can be replaced by removing the lids 27 from the base portions 26 of the first and second filtration tanks.

FIG. 3 shows a second embodiment of the water purifier of the present invention, which is of a type installed at a faucet of a water supply or the like. The first microfilter 50 is a hollow fiber filter JII51.
It is composed of a housing 52, a cap body 53, and a fixed resin 54 for holding and fixing each of them, and is installed in a first filtration tank 55 as a filtration cartridge. The second microfilter 56 portion and the adsorption purification portion filled with activated carbon 57 are integrally constructed and installed in a water purification tank 59 as a water purification cassette 58. The water purification tank 59 consists of a main body part 60 and a lid part 61, each of which is fluid-tightly fixed by a fixing ring 63 via a gasket 62. Further, the main body portion 60 and the first filtration tank 55 are similarly fixed. A heater 64, which is a heating device, is installed in the main body portion 60 of the water purification tank 59.

The first filtration tank 55 has a bypass flow path 65, and the main body portion 60 of the water purification tank 59 has a water purification flow path 66, each of which is provided with a first electric valve 67 and a second electric valve 68. The first and second electric valves are normally closed, but are opened and closed by operating various switches on the case 69 of the water purifier main body.

When the water purification switch 70 is pressed, the second electric valve 68 opens and a flow path is formed between the raw water containing lower 1 and the water purifier lower 2, and the raw water 73 is transferred from the raw water containing lower 1 to the first filtration tank 55.
and is filtered by a hollow fiber-like filter membrane 51 to remove fine particles and microorganisms contained therein. The generated primary filtered water 74 is introduced into the water purification cassette 58, where dissolved organic matter, harmful substances, etc. are adsorbed and removed by the activated carbon 57, and then the hollow fiber-like filtration membrane 75 of the second microfilter 56
further filtered. The generated secondary filtered water 76 passes through the water purification cassette 58, between the lid portion 61 and the main body portion 60 of the water purification tank 59, passes through the water purification channel 66, and reaches the water purifier lower 2.
More leakage. In this way, purified water can be obtained and used for drinking, cooking, and other purposes.

If the purified water is not needed for cleaning equipment, etc., pressing the normal water switch 77 opens the first electric valve 67 and the raw water 73 directly flows out from the bypass channel 65, so it can be used. At this time, the water in the first filtration tank 55 is replaced and particulates etc. deposited on the surface of the first microfilter 50 are washed away, so that clogging of the first microfilter 50 can be reduced.

As the raw water is filtered, the adsorption purification ability of activated carbon decreases, but in this case, remove the six cases of the main body, remove the fixing ring 63, and remove the lid part 61. The water purification cassette 58 will be exposed, so remove it. can be easily replaced with a new one. If necessary, the first microfilter 50 can be replaced by removing the water purification tank 59 and the first filtration tank 55.

When the water purification cassette 58 is replaced or when raw water 73 is introduced for the first time, a heating switch 78 is pressed to activate a timer and a heater 64 installed in the main body part 60 of the water purification tank 59 generates heat for a predetermined time. This heats the water purification tank and sterilizes the inside. An oil-free timer can also be used to automatically heat the water at night when purified water is not in use.

The pore size of the filtration membrane of the first microfilter 50 is set to 0.45 μm, which is a size that can almost prevent the invasion of general microorganisms.
It is also good to use a combination of microfilters with different pore sizes, such as using a smaller second microfilter 56 that can remove even the smallest particles. In addition to replacing water using a bypass flow path to reduce the risk of clogging, the first microfilter can be made to last longer by increasing the pore size to the extent that sterilization is possible. . Since the second microfilter passes water that has been filtered and contains very few particles, it is practical enough even if the filter has a smaller pore diameter, which would clog quickly if used in the first microfilter. It becomes possible to use it for Furthermore, in this embodiment, the activated carbon and the second microfilter are configured as an integrated water purification cassette 58, and both are replaced at the same time. Since it is only necessary to maintain the filtration ability of the second microfilter 56, from this point of view it is possible to use a material with a smaller pore size as the second microfilter 56.
More purified water can be obtained.

If the water purifier of the present invention is used, there will be almost no growth of microorganisms in the water purification tank containing activated carbon, and if the first microfilter is used for a long period of time, rust, fine particles, microorganisms, etc. will accumulate. When the filtration capacity decreases due to concentration polarization, it is possible to restore a considerable part of the filtration capacity of the first microfilter by discharging a certain amount of raw water in front of the first microfilter using the bypass flow path. can.

The above-mentioned effects will be explained more specifically using experimental examples.

Experiment 1 Two water purifiers having the same basic structure as the water purifier shown in Fig. 2 were manufactured, connected to a water supply, and the following water flow experiment was conducted.

Table 1 shows the specifications of the produced water purifier.

The number was measured.

The results are shown in Table 2.

Table 1 Water purifier specifications Tap water is introduced into two water purifiers, and for No. 1, the heater is operated for 24 hours and the temperature between the first and second filters is maintained at 50°C to sterilize and then heated. was stopped and left for 48 hours. No. 2 was filled with tap water, but the heater was not activated and the water was left as it was for 72 hours. The water was taken out as sterilely as possible from the water purification tank, and the LCC was poured into an agar medium and placed in a petri dish. The seeds were sprinkled and placed in a thermostat at 25°C and cultured for 2 weeks. Based on the results of colony experiment 1 on each agar medium, a water purifier was installed and heated to eliminate the microorganisms present in the water purification tank. It can be seen that proliferation is suppressed. On the other hand, in the water purifier that was not heated, a considerable number was detected although it was below the standard value for waterworks (100 pieces), and it is expected that proliferation will occur as the water purifier is used.

Experiment 2 Using two water purifiers similar to Experiment 1, 1. R/min 1 day
The water purifier was used for 30 days under conditions of running water for 8 hours and stopping for 6 hours, and after the last 6 hours, the water in the tank was sampled as sterilely as possible and the number of bacteria was measured. No
In , 1, water was first filled into the water purifier, the water purifier was heated and maintained at 60°C using a heater for 12 hours, and then filtration was started. Thereafter, the water purification tank was maintained at 60'C by operating the heater for 6 hours once every 5 days without running water. As a comparative example, NO12 was filtered in the same manner as NO11 without operating the heater.

The number of bacteria was measured in the same manner as in Experiment 1.

The results are shown in Table 3.

From Experiment 2, it was found that even after using the water purifier of the present invention for - months, almost no growth of microorganisms was observed in the water purification tank in which heating was performed, whereas in the comparative example in which heating was not performed, many microorganisms multiplied. Growth of microorganisms was observed. Although it is said that the microorganisms themselves in the water purification tank will not flow out due to the second microfilter, there is a possibility that some of the remaining microorganisms that have grown will flow out, and components harmful to the bacteria may elute. This can be seen as unfavorable from a safety and hygiene perspective.

The results of Experiment 1.2 show that heating the water purification tank for a certain period of time in the water purifier of the present invention has the effect of suppressing the proliferation of microorganisms such as bacteria in the water purification tank. Although the results are not shown, in other experiments, better results were obtained when the heating temperature was higher and the heating time was longer. However, for the purpose of controlling microorganisms such as mold and bacteria that generally exist in water to a level that does not pose a problem for drinking water, heating to 50℃ or higher can almost achieve the purpose as shown in the experimental example. . The higher the heating temperature, the faster the desired effect can be achieved, but if the heating temperature is too high, the materials for containers and parts that can be used in the water purifier will be limited. In addition, problems such as damage to the filter and generation of bubbles are likely to occur, so heating should be carried out within a temperature range that minimizes these problems. If heating is carried out at a relatively low temperature, the purpose can be achieved by increasing the heating time, and it is preferable to carry out the heating automatically every day using a timer, etc., while the water purifier is not in use, for example at night when family members are sleeping at home. . If the first microfilter and the second microfilter have a substantial pore diameter of 0.45 μm or less, and the first microfilter, water purification tank, and second microfilter are connected in a liquid-tight manner, heating is not necessary every day. None. This can be done when replacing purification materials such as adsorbents, or at regular intervals such as once a week for a predetermined period of time.

Experiment 3 Two water purifiers with the basic structure shown in Figure 2 were manufactured and connected to a water supply, and the following water flow experiment was conducted. Table 4 shows the basic specifications of the manufactured water purifier.

Water was passed through the two manufactured water purifiers, and the initial purified water flow rate immediately after the start of use (purified water bath side open) was measured, and Table 4 Experiment 3
After the specifications of the water purifier used in Experiment 2, use was started under the conditions of Experiment 2, and after 4 months of use, the purified water flow rate was measured again.

Next, the bypass channel was opened, and the raw water stagnating just before the first microfilter was replaced with tap water at the maximum flow rate. After exchanging for 10 minutes, close the bypass flow path,
The flow rate of purified water was measured again, and the flow rate of purified water before and after replacement was compared. The results are shown in Table 5. In addition, No, 1, No,
Both samples were heated in the same manner as in Example 2.

Table 5 Purified water flow rate (,, &/min) As can be seen from the results, the purified water flow rate, which had decreased after 4 months of use, was recovered to a considerable extent by replacement, and the amount of water generated on the surface of the first microfilter increased. It can be seen that the filtration performance of the filter was restored as the accumulation of fine particles and the like was removed by replacement.

[Effects of the Invention] As described above, the water purifier of the present invention has the following features.

■A heating device is installed near the water purification tank, which can heat and sterilize the inside of the water purification tank, preventing the growth of microorganisms without using antibacterial or sterilizing agents in the purification material in the water purification tank. This can safely solve the problem of microbial growth found in current water purifiers.

■A water purification tank filled with purification material such as activated carbon or ion exchanger is sandwiched between the first microfilter and the second microfilter, and in particular, the effective pore diameter of the microfilter is 0.45 μm or less. If there is mold or mildew in the purification material,
Since new microorganisms such as bacteria do not invade, the growth of microorganisms in this area can be more effectively prevented.

■A bypass that allows water introduced from the water inlet provided in the first filtration tank to flow out of the first filtration tank without passing through the first microfilter, immediately before passing through the first microfilter. Because the flow path is provided, if the first microfilter is used for a long time and its filtration ability decreases due to concentration polarization due to rust, fine particles, microorganisms, etc., the raw water in front of the first microfilter can be removed. The concentration polarization on the surface of the first microfilter is removed by forcibly discharging the water using the raw water pressure, and the filtration ability of the first microfilter can be restored to a considerable extent. This allows it to be used for a longer period of time.

[Brief explanation of the drawing]

Section 1 is a schematic diagram showing the basic principle of the present invention, FIG. 2 is a partial sectional view showing the first embodiment of the invention, and FIG. 3 is a partial sectional view showing the second embodiment. It is a diagram. 1... Water purifier 2... First microfilter 3... First filtration tank 4... Purification material 5... Water purification tank 6... Second microfilter 7... Second Filtration tank 8...Heating device 9...Raw water
10... Inlet 11... Bypass flow path 12...
Stop valve 13...Water purification outlet 20...First microfilter 21...Hollow fiber filtration membrane 22...Casing 23...
... Cap body 24 ... Fixed resin 25 ...
・First filtration tank 26...base part 27...
- Lid body 30... Second filtration tank 31... Second micro filter 32... Water purification tank 33... Activated carbon 34... Purification material cassette 35... Lid body 36 of water purification tank...・Heater 37... Raw water inlet 38... Raw water 39... Primary filtrated water 40... Adsorption purified water 41... Secondary filtrated water 42... Bypass channel 43... Electric valve 44 ... Control switch 45 ... Set screw 50 First microfilter

Claims (6)

[Claims] (1) A first filtration tank with a first microfilter installed and a second microfilter installed before and after the water flow of a water purification tank filled with water purification materials such as adsorbents and ion exchangers. A water purifier, comprising: a second filtration tank, and further comprising a heating device near the water purification tank. (2) The water purifier according to claim 1, wherein the heating device is capable of heating at least the water purifying tank to 50° C. or higher. (3) Claim 2 or 3, characterized in that the heating device can set the heating time using a timer.
Water purifier as described in section. (4) Immediately before the water introduced from the water introduction part provided in the first filtration tank passes through the first microfilter, the water enters the first filtration tank without passing through the first microfilter. 4. The water purifier according to any one of claims 1 to 3, wherein the first filtration tank is provided with a bypass flow path that allows water to flow out of the water. (5) The water purifier according to claim 4, wherein the bypass channel is automatically opened and closed by a timer or the like. (6) The water purifier according to any one of claims 1 to 5, wherein at least one of the first or second microfilter is a hollow fiber filtration membrane.