JP3543372B2 - Water treatment equipment with activated carbon regeneration function - Google Patents

Description

[0001]
[Object of the invention]
[Industrial applications]
The present invention relates to a domestic water treatment apparatus which cleans water by bringing clean water into contact with activated carbon and further treats the purified water thus obtained by a filtering device and / or an electrolytic device. The present invention particularly relates to a water treatment apparatus having an activated carbon regenerating function, in which activated carbon is boiled and sterilized by heating the activated carbon as needed, and the activated carbon is maintained for a long period of time.
[0002]
[Prior art]
By contacting tap water with activated carbon, residual chlorine dissolved in tap water, harmful organic chlorine compounds such as trihalomethane, and moldy substances such as 2-methylisoborneol and diosmin are adsorbed on activated carbon and removed. The improved water purifier is commercially available. Removal of residual chlorine (hypochlorite ion or hypochlorous acid) results in the loss of water sterilization power, so in a water purifier equipped with activated carbon, a filter such as a hollow fiber membrane filter is installed after activated carbon, It is common to allow bacteria to be filtered.
[0003]
Further, a water treatment apparatus that supplies water purified by activated carbon to an electrolytic cell to perform electrolysis to obtain alkaline water or acidic water is also commercially available.
[0004]
On the other hand, an activated carbon regeneration type water purifier has been proposed in which activated carbon is boiled and sterilized by heating the activated carbon tank as needed, and the activated carbon is maintained for a long period of time. By heating, trihalomethane with a low boiling point (boiling point of chloroform is about 61 ° C; boiling point of bromodichloromethane is about 90 ° C) is desorbed from the activated carbon, and the activated point on the activated carbon surface is restored. The life is extended.
[0005]
[Problems to be solved by the invention]
Also in the activated carbon regeneration type water purifier, it is preferable that a hollow fiber membrane filter and an electrolytic cell are provided at the subsequent stage of the activated carbon tank to further filter and electrolyze the purified water treated with the activated carbon. However, in the current state of the art, since the hollow fiber membrane filter does not have sufficient heat resistance, the hollow fiber membrane filter may be degraded by hot water or steam generated at the time of activated carbon regeneration. Also, in the case of an electrolytic cell, it is not preferable to impose a thermal load because the case of the electrolytic cell is deteriorated by heat and the electrode plate is distorted.
[0006]
An object of the present invention is to extend the life of activated carbon by heating and regenerating the activated carbon in a water treatment apparatus provided with a hollow fiber membrane filter and an electrolytic cell at a stage subsequent to the activated carbon tank, and to generate hot water or steam generated during the activated carbon regeneration. The purpose is to protect the hollow fiber membrane filter and the electrolytic cell in the subsequent stage from the heat of the above.
[0007]
Configuration of the Invention
Means and action for solving the problem
The water treatment apparatus of the present invention has an activated carbon tank filled with activated carbon, and a second water treatment means, such as a hollow fiber membrane filter or an electrolytic cell, disposed at a subsequent stage. A heater is provided in the activated carbon tank, and the activated carbon is heated to desorb adsorbed substances and regenerate the activated carbon. A three-way valve is connected to the activated carbon tank, the purified water outlet is connected to the second water treatment means, and the hot water outlet is connected to a hot water discharge hose. The three-way valve may be manual or electric, but is preferably a temperature-sensitive type that switches automatically in response to temperature.
[0008]
When the heater is not operated, the water purified by the activated carbon is sent to a hollow fiber membrane filter or an electrolytic cell, and further subjected to filtration or electrolysis. During operation of the heater, the three-way valve is switched, and hot water or steam flowing out of the activated carbon tank is discharged from the hot water discharge hose, bypassing the hollow fiber membrane filter and the electrolytic cell. Therefore, no heat load is applied to the hollow fiber membrane filter or the electrolytic cell.
[0009]
In the apparatus according to the first aspect, the second water treatment means is an electrolytic cell, and a waste water hose and a hot water discharge hose of the electrolytic cell are merged inside a housing of the water treatment apparatus. By doing so, the number of discharge hoses from the water treatment device can be reduced to one, and the piping can be simplified.
[0010]
In the apparatus described in claim 2, the second water treatment means is a hollow fiber membrane filter, and the hot water discharge hose is joined to the purified water discharge hose from the filter inside the casing of the water treatment device. In this case, the number of water hoses from the water treatment device can be reduced to one, and the piping can be simplified.
[0011]
In a preferred embodiment, a trap mechanism is provided between the junction of the hot water discharge hose and the waste water hose (or the purified water spouting hose) and the electrolytic cell (or the hollow fiber membrane filter), and when the heater is activated. Prevent hot water or steam from flowing back toward the electrolytic cell (or hollow fiber membrane filter). This trap mechanism is preferably formed integrally with the T-joint.
[0012]
【Example】
A first embodiment of the present invention will be described with reference to the accompanying drawings. Referring to FIG. 1, a water treatment apparatus 10 of the present invention can be used, for example, mounted on a kitchen counter 14 provided with a sink 12. In the illustrated use example, a single-lever type hot / water mixer tap 16 is installed in the sink, and hot water from a hot-water heater (not shown) is supplied to the hot / water mixer tap 16 via a hot water supply pipe 16A. Water is supplied from a water supply pipe 16B connected to a water pipe (not shown).
[0013]
A faucet adapter 20 having a built-in switching valve mechanism is attached to the spout 18 of the faucet 16, and the adapter 20 is connected to the water treatment apparatus 10 by a water supply hose 22 and a treated water discharge hose 24. When the handle 26 of the adapter 20 is turned to a predetermined position, the clean water from the faucet 16 is sent to the water treatment device 10 by the clean water supply hose 22, and the treated water is sent back from the discharge hose 24 to the adapter 20. It is discharged from the outlet 28. When the handle 26 is turned to another position, untreated clean water (or hot water mixture) from the faucet 16 is discharged from the outlet 28 of the adapter 20 without passing through the water treatment device 10. A drain hose 30 is further connected to the water treatment device 10 so that unnecessary water, hot water or steam generated in the water treatment device 10 is discharged to the drain 12.
[0014]
Referring to FIG. 2, in the first embodiment, the water treatment apparatus 10 removes particulate components such as red rust and microorganisms floating in the tap water by a filter in advance, and then dissolves in the tap water. Harmful or undesired substances such as residual chlorine, trihalomethane and odorous substances are removed by adsorption of activated carbon, and the purified water thus purified is further electrolyzed as necessary to produce acidic water or alkaline water. It has become. For this reason, the water treatment apparatus 10 includes a filtration stage 32 having a built-in filter (not shown) such as a hollow fiber membrane filter, an adsorption stage composed of an activated carbon cartridge 34 containing activated carbon, and an electrolysis of water. An electrolytic cell 36 for generating acidic water or alkaline water is provided. These components of the water treatment device are supported on a base 40 with a bottom plate 38 and are surrounded by an outer case 42.
[0015]
The tap water from the faucet 16 is sent to the filtration stage 32 via the tap water supply hose 22, and the filtered tap water is sent to the activated carbon cartridge 34 via the hose 44. The activated carbon cartridge 34 is formed of a metal such as stainless steel, and an electric heater 46 is provided at the bottom thereof. As shown in FIG. 3, the activated carbon cartridge 34 has an activated carbon layer 34C formed by arranging a core frame 34B in a container 34A formed of a stainless steel sheet-wrapped can and forming activated carbon fibers or granular activated carbon with a binder or the like. Is fixed around the core frame 34B.
[0016]
A hose 44 from the filtration stage 32 is connected to the inlet 34D of the cartridge 34, and a three-way valve 48 is attached to the outlet 34E. The activated carbon cartridge 34 is heated by turning on the electric heater 46 periodically or by a user's switch operation. By heating, the activated carbon in the cartridge 34 is sterilized by boiling, chlorine and trihalomethane adsorbed on the activated carbon are desorbed, and the activated carbon is regenerated. Purified water obtained by the activated carbon treatment, hot water or steam generated by heating at the time of regeneration is sent from the outlet 34E of the cartridge 34 to the three-way valve 48.
[0017]
The three-way valve 48 is of a temperature-sensitive type, and the outlet is automatically switched according to the temperature of hot water or steam flowing out of the cartridge 34 at the time of regeneration of activated carbon. As shown in FIGS. 4 and 5, the three-way valve 48 includes a movable part 48A having a built-in temperature-sensitive element made of a heat-expandable wax composition and the like, a water purification outlet 48B, and a hot water outlet 48C. As a result, the spindle 48D extends to move the valve element 48E rightward in FIG. 4, and the hot water or steam from the cartridge 34 flows out to the hot water outlet 48C. The temperature-sensitive three-way valve 48 can be set so that, for example, when the ambient temperature is 90 ° C. or lower, the fluid is sent to the purified water outlet 48B, and when the temperature exceeds the above temperature, the fluid is sent to the hot water outlet 48C. The purified water outlet 48B of the three-way valve 48 is connected to the electrolytic cell 36 via a hose 50, and the hot water outlet 48C is connected to a T-joint 54 with a built-in trap mechanism via a hot water discharge hose 52. Instead of the temperature-sensitive three-way valve, an electric or manual three-way valve may be adopted.
[0018]
When the water treatment device 10 is used (when the heater 46 is not operated), the purified water obtained by the activated carbon cartridge 34 is sent to the electrolytic cell 36. An example of the configuration of the electrolytic cell 36 will be described with reference to FIGS. The illustrated electrolytic cell 36 is a non-diaphragm type, and has a vertically long pressure-resistant case 56 made of resin. As can be clearly understood from FIG. 6, three electrode plates of a first side electrode plate 58, a center electrode plate 60, and a second side electrode plate 62 are sandwiched between a plurality of resin spacers 64 in the recess of the case 56. The electrolytic cell 36 is assembled by sequentially disposing the cover 66 and screwing the cover 66 to the case 56 in a liquid-tight manner. By arranging two side electrode plates on both sides of the center electrode plate 60, the electrolytic cell 36 has a double cell structure. A terminal 68 is fixed to each electrode plate, and is connected to a DC power supply via a cord. In the alkaline water generation mode, a voltage is applied such that the side electrode plates 58 and 62 become anodes and the central electrode plate 60 becomes a cathode. In the acidic water generation mode, a voltage of the opposite polarity is applied.
[0019]
As can be clearly understood from FIG. 7, the case 56 has a purified water inlet 70 and a first electrolyzed water outlet 72 (this outlet is an alkaline water outlet in the alkaline water supply mode, and is an acidic water outlet in the acidic water supply mode). And a second electrolyzed water outlet 74 (which becomes an acidic water outlet in the alkaline water supply mode and becomes an alkaline water outlet in the acidic water supply mode). The inlet 70 communicates with a distribution passage 76 having a substantially triangular cross section. As can be clearly understood from FIG. 8, the distribution passage 76 is formed by the case 56 and the cover 66, and extends over the entire length of the electrode plate in the vertical direction.
[0020]
As can be clearly understood from the enlarged sectional view of FIG. 11, two water passages 78 are formed on both sides of the center electrode plate 60. These water passages function as an electrolytic chamber in cooperation with the electrode plate. Since a plurality of spacers 64 extending in the horizontal direction are arranged between the electrode plates, the water flowing down from the purified water inlet 70 along the distribution passage 76 flows horizontally to the water passage 78 as shown in FIG. Inflow. If the electrode gap is made sufficiently small, the water flow flowing in the water passage 78 in the horizontal direction becomes laminar. Therefore, even if a diaphragm is not provided between the electrode plates, the acidic water and the alkaline water generated along the surface of the electrode plate by electrolysis can be separately collected.
[0021]
The electrolyzed water generated along the surface of the central electrode plate 60 is collected in the first electrolyzed water collection passage 80 and discharged from the first outlet 72. The first electrolytic water recovery passage 80 is defined by the case 56 and the cover 66, and extends over the entire length of the electrode plate in the vertical direction, similarly to the distribution passage 32. The electrolyzed water generated along the surfaces of the side electrode plates 58 and 62 is collected in the second electrolyzed water recovery passage 82. For this reason, a slit 84 is formed in each side electrode plate, and the electrolytic water flowing along the surfaces of the side electrode plates 58 and 62 flows into the second electrolytic water recovery passage 82. I have. The electrolyzed water collected in the second electrolyzed water recovery passage 82 is discharged from the second outlet 74 via the communication port 86.
[0022]
Referring again to FIG. 2, a valve unit 88 is connected to a lower part of the electrolytic cell 36 so as to switch the direction of water flowing out from outlets 72 and 74 of the electrolytic cell 36. The valve unit 88 can be composed of a control valve 90 and a motor 92 with a reduction gear. 12 to 15 show an example of the control valve 90.
[0023]
Referring to FIGS. 12 to 15, the control valve 90 has a housing 94, a stationary member 96 positioned in the housing 94, and a rotating disk 100 driven to rotate by a motor 92 via a shaft 98. The housing 94 has a first inlet 102 connected to the first outlet 72 of the electrolytic cell 36, a second inlet 104 connected to the second outlet 74 of the electrolytic cell 36, a used water outlet 106, and a waste water outlet. 108 and their internal passages are formed. The stationary member 96 and the rotating disk 100 are formed with various ports and recesses as shown, and the entire amount of water flowing from the outlets 72 and 74 of the electrolytic cell 36 is used depending on the angular position of the rotating disk 100. The electrolytic water flowing out of the water outlet 106 or the waste water outlet 108 or the electrolytic water flowing out of the first outlet 72 of the electrolytic cell 36 is sent to the use water outlet 106, and the electrolytic water flowing out of the second outlet 74 is sent to the waste water outlet 108. It has become.
[0024]
The discharge hose 24 (FIG. 1) is connected to the use water outlet 106 of the control valve 90, and the waste water hose 110 (FIG. 2) is connected to the waste water outlet 108. As shown in FIG. 2, the waste water hose 110 is connected to a T-joint 54 with a built-in trap mechanism. Referring to FIGS. 16 and 17, the T-joint 54 has a body 118 with two inlets 112 and 114 and one outlet 116. A trap structure 124 is formed in the main body 118 by a weir 120 and a partition 122 so that a predetermined level of water is accumulated. The outlet 116 of the T-joint 54 is connected to the drain hose 30 (FIGS. 1 and 2), the inlet 112 is connected to the hot water discharge hose 52 from the three-way valve 48, and the inlet 114 is discarded from the control valve 90. Water hose 110 is connected.
[0025]
Referring to FIG. 2 again, the operation display unit 126 is provided on the base 40 of the water treatment apparatus 10. Further, in the base 40, a control device (not shown) for controlling the electric heater 46 for regenerating the activated carbon of the water treatment device 10, the electrolytic cell 36, and the motor 92 of the control valve 90 are arranged. Power to the controller is obtained from power cord 128 (FIG. 1).
[0026]
The operation and use of the water treatment apparatus 10 will be described. When the user selects “purified water” by operating the operation display unit 126, the electrolytic cell 36 is not operated, and the control valve 90 is set to the electrolytic cell 36. Is switched to such a position that the total amount of water flowing out of the two outlets 72 and 74 is sent to the service water discharge hose 24. When the user operates the switching handle 26 (FIG. 1) to connect the faucet 16 to the water treatment apparatus 10 and open the faucet 16, tap water is purified by passing through the hollow fiber membrane filter 32 and the activated carbon cartridge 34. The purified water is sent to the used water discharge hose 24 through the suspended electrolytic tank 36 and discharged from the faucet 28.
[0027]
When the user selects “alkaline water”, the control valve 90 sets the flow rate of water flowing from the first outlet 72 of the electrolytic cell 36 to the used water discharge hose 24 at 4 l / min, and the second outlet 74 of the electrolytic cell 36. Is controlled so that the flow rate of the waste water flowing from the waste water hose 110 to the drain hose 30 becomes 1 l / min. In the alkaline water supply mode, a voltage is applied to the electrolytic cell 36 with a polarity such that the central electrode plate 60 becomes a cathode and the side electrode plates 58 and 62 become anodes. Therefore, alkaline water is generated along the surface of the cathode plate 60 and sent to the first outlet 72 of the electrolytic cell 36, and acidic water is generated along the surfaces of the anode plates 58 and 62 and sent to the second outlet 74. Can be The obtained alkaline water is sent to a faucet via a discharge hose 24, and the acidic water is discarded into a sink via a drainage hose 30.
[0028]
When the user selects "acidic water", the polarity of the voltage applied to the electrolytic cell 36 is reversed, and the electrolytic cell has a polarity such that the central electrode plate 60 becomes an anode and the side electrode plates 58 and 62 become cathodes. Power is supplied to 36. Accordingly, acidic water is obtained at the first outlet 72 of the electrolytic cell 36, and alkaline water is output at the second outlet 74. Further, the control valve 90 is controlled to a position where the flow rate of the acidic water to the use water discharge hose 24 becomes, for example, 3 l / min, and the flow rate of the alkaline water to the drain hose 30 becomes 2 l / min. The acidic water is sent to the faucet via the use water discharge hose 24, and the alkaline water is discarded into the sink via the drain hose 30.
[0029]
With the passage of water to the activated carbon cartridge 34, the activated carbon adsorbs substances, and the adsorption performance of the activated carbon decreases. Therefore, the control device energizes the heater 46 at an appropriate time every day, such as midnight, and heats the activated carbon cartridge 34 to regenerate the activated carbon. When the reproduction time set by the operation display unit 126 has come or the manual reproduction switch has been pressed, the control device starts energizing the heater 46. When the heater 46 is energized, the water in the cartridge 34 boils, the activated carbon in the cartridge 34 is sterilized by boiling, and volatile substances such as trihalomene and chlorine ions adsorbed on the activated carbon are desorbed. Will be played.
[0030]
When the activated carbon cartridge 34 is heated by energizing the heater 46, the wax of the three-way valve 48 expands and connects the cartridge 34 to the hot water outlet 48C. Therefore, the hot water and steam generated in the cartridge 34 are sent to the T joint 54 via the hot water discharge hose 52 without being sent to the electrolytic cell 36. As shown in FIGS. 16 and 17, the trap structure 124 is incorporated in the T-joint 54, thereby preventing hot water or steam from flowing backward from the T-joint 54 toward the electrolytic cell 36. In this way, the electrolytic cell 36 can be protected from hot water or steam when the activated carbon cartridge 34 is regenerated.
[0031]
When the electrolytic cell 36 is used, the waste water discharged from the electrolytic cell is sent to the hose 110. Since the hot water discharge hose 52 and the waste water hose 110 are joined by the T-joint 54, only one drainage hose 30 needs to be extended from the T-joint 54 to the sink 12. Therefore, the piping around the sink can be simplified.
[0032]
When the water retained in the cartridge 34 and the water contained in the activated carbon evaporate and the regeneration of the activated carbon is completed, the temperature at the bottom of the cartridge 34 increases. A temperature detecting element such as a thermistor is disposed at the bottom of the cartridge 34. When the controller detects that the temperature at the bottom of the cartridge exceeds, for example, 120 ° C. based on a signal from the thermistor, the controller 46 turns on the heater 46. To end.
[0033]
In the second embodiment of the present invention, a second hollow fiber membrane filter is provided in place of the electrolytic cell 36 of the above-described embodiment, and bacteria which may flow out of the activated carbon cartridge 34 when not used for a long period of time are removed. Remove. This second hollow fiber membrane filter is connected to a purified water outlet 48B of the three-way valve 48 by a hose 50. Therefore, hot water and steam generated during regeneration of the activated carbon cartridge 34 are not sent to the second hollow fiber membrane filter. Further, in this embodiment, similarly to the first embodiment, the discharge hose (not shown) from the second hollow fiber membrane filter can be joined to the trap joint type T joint 54 together with the hot water drainage hose 52. it can. As in the first embodiment, since there is a trap structure, hot water or steam generated during regeneration of the activated carbon cartridge 34 is prevented from flowing back from the hot water drain hose 52 to the second hollow fiber membrane filter. In this embodiment, the waste water hose 30 of the above-described embodiment is omitted, and the discharge hose 24 can be connected to the outlet 116 of the T-joint 54.
[0034]
In the third embodiment of the present invention, a second hollow fiber membrane filter can be arranged downstream of the electrolytic cell 36 of the first embodiment described above.
[0035]
Although a specific embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and various design changes can be made. For example, the filtration stage 32 can be omitted. Further, the structures of the activated carbon cartridge 34, the electrolytic cell 36, and the three-way valve 48 can be changed.
[0036]
【The invention's effect】
The hot water and steam generated in the cartridge 34 during the activated carbon regeneration are sent to the hot water discharge hose 52 by the three-way valve 48, so that the post-processing device (the electrolytic cell 36 and the second hollow fiber membrane filter) can be protected from heat. it can. Therefore, the activated carbon adsorption performance can be recovered while ensuring the durability of the post-treatment device, and the life of the entire water treatment device 10 can be extended.
[0037]
According to the embodiment of the present invention, when the waste water hose 110 from the electrolytic cell 36 and the hot water discharge hose 52 are joined at the T joint 54, the discharge hose 30 can be reduced to one, and the piping can be reduced. It can be simplified. In this case, when the trap structure 124 is provided between the T joint 54 and the electrolytic cell 36, hot water or steam can be prevented from flowing backward from the T joint to the electrolytic cell. The electrolytic cell can be protected while simplifying.
[0038]
When the T-joint 54 has a trap-incorporated structure, the water treatment apparatus can be made compact.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of use of a water treatment apparatus of the present invention.
FIG. 2 is an exploded perspective view of the water treatment apparatus shown in FIG.
FIG. 3 is a partially cutaway sectional view of the activated carbon cartridge shown in FIG. 2;
FIG. 4 is a sectional view of the three-way valve shown in FIG. 2;
FIG. 5 is a perspective view of a movable portion of the three-way valve shown in FIG.
FIG. 6 is an exploded perspective view of the electrolytic cell shown in FIG.
FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6, showing an assembled state of the electrolytic cell.
FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7, in which an electrode plate and a spacer are omitted for simplification of the drawing.
FIG. 9 is a sectional view along IX-IX in FIG. 7;
FIG. 10 is a sectional view taken along line XX of FIG. 7;
FIG. 11 is an enlarged view of a portion inside a circle in FIG. 8;
FIG. 12 is an exploded perspective view of a control valve.
FIG. 13 is an exploded perspective view of the stationary member and the disk shown in FIG. 12 as viewed obliquely from below.
FIG. 14 is a plan view of the housing shown in FIG. 12;
FIG. 15 is a sectional view taken along the line XV-XV in FIG. 14;
16 is a partially cutaway perspective view of the T-joint with a built-in trap shown in FIG. 2;
FIG. 17 is a sectional view taken along the line XVII-XVII in FIG. 16;
[Explanation of symbols]
10: Water treatment device 34: Activated carbon tank 36: Second water treatment means (electrolysis tank)
42: Water treatment device housing 46: Heating means 48: Three-way valve 48B: Three-way valve purified water outlet 48C: Three-way valve hot water outlet 52: Hot water discharge line 54: T joint 124: Trap mechanism

Claims (4)

A water treatment apparatus, comprising: an activated carbon tank filled with activated carbon; and a second water treatment means disposed downstream of the activated carbon tank, wherein the water treatment apparatus further treats water purified by the activated carbon.
A heating means for heating the activated carbon tank to regenerate the activated carbon is provided, a three-way valve provided with a purified water outlet and a hot water outlet is connected to the activated carbon tank, and a purified water outlet of the three-way valve is connected to the second water treatment means. Connecting the hot water outlet of the three-way valve to a hot water discharge line,
When the heating means is not operated, the water purified by the activated carbon is sent to the second water treatment means, and when the heating means is operated, the three-way valve is switched to connect the activated carbon tank to the hot water discharge line, thereby supplying hot water. To bypass the second water treatment means,
The second water treatment means is an electrolytic cell for generating alkaline water or acidic water by electrolysis of water, wherein the electrolytic cell has a first outlet and a second outlet, and is provided at the first outlet of the electrolytic cell. Is connected to a first pipeline, and the hot water discharge pipeline is merged with the first pipeline inside a housing of the water treatment apparatus;
A trap mechanism is provided between the junction of the hot water discharge pipe and the second water treatment means, so that hot water or steam flows toward the second water treatment device when the heating means is operated. A water treatment apparatus characterized in that it is prevented. A water treatment apparatus, comprising: an activated carbon tank filled with activated carbon; and a second water treatment means disposed downstream of the activated carbon tank, wherein the water treatment apparatus further treats water purified by the activated carbon.
A heating means for heating the activated carbon tank to regenerate the activated carbon is provided, a three-way valve provided with a purified water outlet and a hot water outlet is connected to the activated carbon tank, and a purified water outlet of the three-way valve is connected to the second water treatment means. And connecting the hot water outlet of the three-way valve to a hot water discharge line,
When the heating means is not operated, the water purified by the activated carbon is sent to the second water treatment means, and when the heating means is operated, the three-way valve is switched to connect the activated carbon tank to the hot water discharge line, thereby supplying hot water. To bypass the second water treatment means,
The second water treatment means is a filtration device provided with a hollow fiber membrane filter, the filtration device is connected to a purified water discharge pipe, and the hot water discharge pipe is provided inside the casing of the water treatment apparatus. It is joined to the clean water discharge pipe,
A trap mechanism is provided between the junction of the hot water discharge pipe and the second water treatment means, so that hot water or steam flows toward the second water treatment device when the heating means is operated. A water treatment device characterized in that it is prevented . The water treatment apparatus according to claim 1, wherein the trap mechanism is formed integrally with a T-joint. The three-way valve is a temperature-sensitive three-way valve that switches in response to the temperature of the fluid flowing out of the activated carbon tank, and the three-way valve connects the activated carbon tank to the second water treatment device when the fluid temperature is equal to or lower than a predetermined value. The water treatment apparatus according to any one of claims 1 to 3 , wherein the activated carbon tank is connected to a hot water discharge pipe when the fluid temperature exceeds the predetermined value.

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