WO2013042432A1

WO2013042432A1 - Water treatment device

Info

Publication number: WO2013042432A1
Application number: PCT/JP2012/067456
Authority: WO
Inventors: 俊輔森; 千尋井; 尼木　実知子
Original assignee: パナソニック株式会社
Priority date: 2011-09-21
Filing date: 2012-07-09
Publication date: 2013-03-28
Also published as: JP2013066822A

Abstract

The present invention uses a purification unit (4) to purify raw water supplied from a raw water supply unit (2) and passes the result to a purified water supply pathway (3). The present invention is provided with at least: a reservoir unit (5) that can retain at least the water in the purified water supply pathway (3); a sterilizing fluid generating unit (8) that can generate a sterilizing fluid containing a sterilizing component and supply the result into the purified water supply pathway (3); and a sterilizing component decomposition unit (81) that, at the completion of sterilization, recovers the sterilizing fluid in the purified water supply pathway (3) and decomposes the sterilizing component. Also, during sterilization of the purified water supply pathway (3), the water in the purified water supply pathway (3) is transferred to the reservoir unit (5). This transferred water is used as raw water after sterilization.

Description

Water treatment equipment

The present invention relates to a water treatment apparatus for purifying raw water such as tap water to generate purified water.

Conventionally, in a water treatment apparatus that purifies raw water such as tap water or well water to generate purified water, it has been proposed to sterilize the inside of the route when a certain period of use has passed, and ozone gas is used as an example. There is known a water treatment apparatus for sterilizing (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 10-337324

However, in the above-described conventional water treatment apparatus, it is necessary to temporarily set the inside of the path that has been emptied to a predetermined concentration, with the inside of the path that is sterilized when sterilizing with ozone gas empty. At this time, in the water treatment apparatus of Patent Document 1, the inside of the path is drained and drained to empty it.

Therefore, every time sterilization is required, draining work becomes necessary, and the workability becomes poor. Further, since drained water is drained, there is a fear that the economic efficiency will be deteriorated.

Therefore, an object of the present invention is to obtain a water treatment apparatus capable of emptying and sterilizing the inside of a route without drainage.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a raw water supply unit, a purification unit for purifying raw water supplied from the raw water supply unit and passing the purified water to a purified water supply path; A reservoir capable of storing water in a channel, a sterilizing fluid generator capable of supplying a bactericidal fluid containing a bactericidal component and supplying the bactericidal fluid into the purified water supply channel, and the purified water supply channel at the end of sterilization The sterilizing component decomposing unit for recovering the sterilizing fluid and decomposing the sterilizing component, and transferring the water in the clean water supply channel to the storage unit when the clean water supply channel is sterilized.

A second feature of the present invention is that the storage unit doubles as the raw water supply unit.

A third feature of the present invention is that a water backflow unit is provided downstream of the purification unit to backflow water in the purified water supply path to the purification unit and transfer the water to the storage unit.

A fourth feature of the present invention is that the reservoir is disposed below the purified water supply path.

According to the water treatment apparatus of the present invention, when sterilizing the clean water supply path, the water in the clean water supply path is transferred to the storage section to empty the clean water supply path, and the empty clean water supply path is Supply the sterilizing fluid generated by the sterilizing fluid generator. When sterilization is completed, the sterilizing fluid in the purified water supply channel is decomposed in the sterilizing component decomposition unit. As described above, since the water in the purified water supply path can be temporarily evacuated to the storage part at the time of sterilization, the water removing operation becomes unnecessary, and the workability at the time of sterilization can be improved. In addition, since the evacuated water can be reused after sterilization, economic efficiency can be enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows roughly 1st Embodiment of the water treatment apparatus concerning this invention. It is a whole block diagram which shows the water flow mode of the water treatment apparatus shown in FIG. It is a whole block diagram which shows the sterilization mode of the water treatment apparatus shown in FIG. It is a whole block diagram which shows roughly 2nd Embodiment of the water treatment apparatus concerning this invention. It is a whole block diagram which shows roughly 3rd Embodiment of the water treatment apparatus concerning this invention. It is a whole block diagram which shows roughly 4th Embodiment of the water treatment apparatus concerning this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First Embodiment
1 to 3 show a water treatment apparatus 1 according to a first embodiment of the present invention. The water treatment apparatus 1 of the present embodiment purifies raw water such as tap water and well water to generate clean water suitable for drinking, and enables sterilization in the clean water supply path 3.

That is, as shown in FIG. 1, the water treatment apparatus 1 according to this embodiment includes the raw water supply unit 2 and the purification unit 4 that purifies the raw water supplied from the raw water supply unit 2 and passes the purified water to the clean water supply path 3. And a reservoir 5 capable of storing water at least in the purified water supply path 3. In the water treatment apparatus 1, the above-described raw water supply unit 2, the purified water supply path 3, the purification unit 4, the storage unit 5, and the like are covered with a cover or the like to form the main unit 11.

The raw water supply unit 2 is connected to a raw water source such as a water pipe (not shown) and takes the raw water into the main body 11, and is provided in the raw water feed path 21 and the main body 11 and disposed at the terminal of the raw water feed path 21 And a raw water feed valve 22. The raw water feed valve 22 is a three-way valve in the present embodiment, the raw water feed passage 21 is connected to one valve port, the raw water introduction passage 41 of the purification unit 4 is connected to the other valve port, The circulation water supply passage 51 communicating with the bottom portion of the storage unit 5 is connected to the valve port of the second embodiment. The circulation water supply passage 51 is provided with a circulation pump P1 that pumps the water in the storage unit 5 to the purification unit 4 via the raw water supply valve 22.

The purification unit 4 has a function of purifying raw water to generate purified water, and may be an MF membrane (microfiltration membrane), UF membrane (ultrafiltration membrane), RO membrane, NF membrane (reverse osmosis membrane), etc. It is configured using a separation membrane. In addition to these separation membranes, other means capable of purifying water can also be used. For example, adsorption materials such as activated carbon, hollow fiber membranes, sand filtration, ion exchange resins, etc. can be used.

The purified water supply channel 3 includes a purified water outlet channel 42 communicating with the outlet of the purification unit 4, and a cold water channel 31 and a thermal water channel 32 provided bifurcatedly from the purified water outlet channel 42.

A cold water discharge valve 33 is provided at the downstream end of the cold water passage 31, and a cold water discharge port 34 extends from the cold water discharge valve 33 to the outside of the main body 11. Further, a hot water spout valve 35 is provided at the downstream end of the thermal water passage 32, and a hot water spout 36 extends from the hot water spout valve 35 to the outside of the main body 11.

In the middle of the heat flow channel 32, a hot water storage unit 6 incorporating the heating unit 61 is provided. The primary side (upstream side) of the thermal water passage 32 is connected to the upper portion of the hot water storage portion 6, and the secondary side (downstream side) is connected to the lower portion of the hot water storage portion 6. The water in the hot water storage unit 6 is heated by the heating unit 61 to a predetermined temperature.

A passage switching valve 37 is provided in a path between the hot water storage portion 6 and the hot water discharge valve 35. The flow path switching valve 37 is constituted by a three-way valve, one hot water storage portion 6 side of the hot water passage 32 is connected to one valve port, the hot water discharge valve 35 side of the hot water flow passage 32 is another valve port The circulation passage 7 of the sterilizing fluid is connected to the remaining valve ports.

A hot water supply pump P2 for pumping hot water in the direction of the hot water discharge port 36 is provided in the middle of the heat passage 32 on the secondary side from the hot water storage portion 6 to the flow path switching valve 37.

In the circulation path 7, when the sterilizing fluid flows, the direction connected to the flow path switching valve 37 is on the downstream side, and the opposite end, which is the upstream side, is on the upstream side of the hot water storage portion 6 of the heat channel 32. It is in communication with The circulation passage 7 is provided with a temporary water supply pump P3 which operates at the time of sterilization and transfers the sterilizing fluid to the downstream side. Further, a branch path 71 branched on the downstream side of the temporary water supply pump P3 is connected to the upper portion of the storage unit 5.

Moreover, while the drain pipe 52 is connected to the lower part of the storage part 5, the drain pipe 62 is connected to the lower part of the hot water storage part 6, too. The drain pipe 52 is provided with a cold water drain valve 53, and the drain pipe 62 is provided with a hot water drain valve 63. Therefore, by opening the

drain valves

53 and 63 at the time of maintenance or the like, the storage unit 5 and the hot water storage unit 6 can be emptied.

Here, a communication passage 38 is provided which communicates the upstream side of the cold water discharge valve 33 of the cold water passage 31 and the hot water passage 32 between the hot water discharge valve 35 and the flow passage switching valve 37. Then, an ozone generation unit 8 as a sterilizing fluid generation unit and an ozonolysis unit 81 as a sterilizing component decomposition unit are provided in series near the cold water discharge valve 33 of the communication passage 38 and near the hot water discharge valve 35.

The ozone generator 8 generates ozone gas as a sterilizing fluid, and can supply the ozone gas into the purified water supply path 3. The ozonolysis unit 81 recovers the ozone gas in the purified water supply path 3 at the end of the sterilization in the purified water supply path 3 to decompose ozone which is a sterilizing component.

The water treatment apparatus 1 is provided with an operation panel (not shown) in the main body 11, and an operation signal of the operation panel is sent to the control unit 9 to control various electric devices of the water treatment apparatus 1. ing. As the electric device, a heating unit 61, an ozone generation unit 8, a raw water feed valve 22, a flow path switching valve 37, a cold water spout valve 33, a hot water spout valve 35, a circulation pump P1, a hot water supply pump P2, a temporary water feed pump There is P3 and these are controlled by the controller 9. The cold water drain valve 53 and the hot water drain valve 63 are manually opened and closed as required. Further, a two-dot chain line shown in FIG. 1 is a wire for electrically connecting the control unit 9 and various electric devices.

By the way, although the heating part 61 of the hot water storage part 6 may be a resistance heating type heater generally used, it can be constituted also using a Peltier device. That is, as is generally known, the Peltier element has a heat dissipation side and a heat absorption side, and in this case, the heat dissipation side of the Peltier element is used to heat the water in the hot water storage portion 6.

And when controlling the heating part 61 by the control part 9, it is preferable to provide a water temperature sensor in the hot water storage part 6, and to feed back and control the detected value of this water temperature sensor to the control part 9. In this case, the temperature of the hot water to be warmed is preferably set in the range of about 60 ° C. to about 95 ° C., but a desired constant temperature, for example, 60 ° C., 80 ° C., 95 It may be set as a specific temperature such as ° C or more.

When the hot water in the hot water storage unit 6 reaches a desired temperature, the control unit 9 switches the flow path switching valve 37 and opens the hot water discharge valve 35 at the same time, and operates the hot water supply pump P2. Do. As a result, the hot water in the hot water storage section 6 is discharged from the hot water discharge port 36. In this case, the hot water storage unit 6 is provided with a heat retention function, and the heating unit 61 is operated even when the water treatment apparatus 1 is stopped, so that the water temperature in the hot water storage unit 6 becomes a predetermined temperature (for example, 60 °). You can keep it warm at C).

When the Peltier element is used as the heating unit 61 as described above, the heat absorption side of the Peltier element can be used to form a cold water storage unit (not shown). When the cold water reservoir is provided as described above, the cold water can be used besides the hot water.

The water treatment apparatus 1 has a water flow mode capable of discharging cold water or hot water and a sterilization mode for sterilizing the purified water supply path 3, and these modes can be selected by the operation panel.

"Water flow mode"
When the user selects the water flow mode on the operation panel, the raw water supply valve 22 is switched to connect the raw water supply passage 21 and the raw water introduction passage 41 with each other. Then, as shown by a dotted line in FIG. 2, the raw water supplied from the raw water supply passage 21 is purified by the purification unit 4 and becomes purified water, and the purified water flows into the cold water passage 31 and the hot water passage 32. The purified water that has flowed into the hot water passage 32 is stored in the hot water storage unit 6, and it is preferable that the stored water be preheated by the heating unit 61.

When the cold water is selected on the operation panel, the cold water discharge valve 33 is opened, and the purified water generated by the purification unit 4 is discharged from the cold water discharge port 34 via the cold water passage 31. In addition, as shown in FIG. 2, as for the various valves with which the water treatment apparatus 1 is equipped, the white triangle shows the communication state, and the black triangle shows the interruption | blocking state, and even if it exists in FIG. .

On the other hand, when hot water is selected on the operation panel, when the hot water in the hot water storage portion 6 reaches a desired temperature as described above, the hot water discharge valve 35 is switched at the same time as the flow path switching valve 37 is switched. Opens. As a result, as indicated by the alternate long and short dash line in FIG. 2, the hot water in the hot water storage unit 6 passes through the hot water channel 32 on the secondary side of the hot water storage unit 6 by the operation of the hot water supply pump P2. The water is discharged from the hot water discharge port 36.

When water flow is stopped by the operation panel, both the cold water discharge valve 33 and the hot water discharge valve 35 are closed, and the raw water feed valve 22 is switched so as to connect the raw water introduction passage 41 and the circulating water supply passage 51.

"Sterilization mode"
When the user selects the sterilization mode on the operation panel, the temporary water supply pump P3 is activated to circulate the water in the purified water supply path 3, specifically the water in the cold water path 31 and the hot water path 32 shown by broken lines in FIG. Pass the passage 7 and transfer it into the reservoir 5. Therefore, the purified water supply path 3 to be disinfected in the present embodiment is a part which transfers water to the storage part 5 and becomes empty, and in the present embodiment, it becomes a part shown by a broken line in FIG. Therefore, the purified water supply path 3 described below indicates a portion to be sterilized after transferring water, and is a portion shown by a broken line in FIG. 3 of the cold water passage 31 and the heat water passage 32. At this time, the circulation path 7 also becomes a portion to be sterilized at the same time.

As described above, the water in the purified water supply path 3 is transferred to the storage unit 5, so that in the sterilization mode, the water in the purified water supply path 3 is temporarily evacuated in the storage portion 5. That is, by evacuating the water in the storage unit 5 in this manner, the inside of the purified water supply path 3 to be sterilized can be emptied.

At this time, although the hot water in the hot water storage unit 6 may be evacuated to the storage unit 5, the hot water storage unit also affects the water temperature when the water in the storage unit 5 is reused as described later. It is preferable to leave the hot water in 6 as it is. Further, since the hot water storage portion 6 and the heat channel 32 on the secondary side of the hot water storage portion 6 are heated and sterilized by the hot water, it is not necessary to necessarily perform the ozone sterilization of the present embodiment.

In addition, in order to transfer the water in the purified water supply path 3 into the storage unit 5 and detect the state in which the purified water supply path 3 is empty, a water level sensor is provided in the storage unit 5 or a timer is set in the control unit 9 It is built-in etc., and it is made to detect an empty state with these water level sensors or timers.

As described above, when it is detected that the inside of the purified water supply path 3 has become empty, the ozone generation unit 8 is operated, and as shown in FIG. Switch to communicate. Then, the ozone gas generated by the ozone generating unit 8 flows through the cold water passage 31 by the temporary water supply pump P3 and flows into the hot water passage 32 as shown by the broken line and the arrow in FIG. After passing through the channel switching valve 37, it reaches the ozonolysis unit 81. As a result, the path through which the ozone gas passes is sterilized. At this time, although not shown, a structure in which ozone gas does not enter the storage unit 5 from the branch path 71 is provided. Then, the ozone gas finally reaching the ozone decomposition unit 81 is decomposed by the ozone decomposition unit 81 and detoxified.

Then, when the sterilization mode is completed, the water evacuated to the storage unit 5 is used again as the raw water. That is, the circulation pump P1 is operated by the termination of the sterilization mode, and the water in the storage unit 5 is supplied from the circulation water supply passage 51 to the purification unit 4 through the raw water supply valve 22 and the raw water introduction passage 41. Therefore, the purified water purified by the purification unit 4 flows into the cold water passage 31 and the heat water passage 32, and the above-described water flow mode can be executed.

The sterilization mode can be selected by the user manually operating the operation panel, but may be controlled to automatically enter the sterilization mode. For example, the sterilization mode can be executed in a predetermined time zone by a timer or the like. In this case, it is preferable to control to be in the sterilization mode automatically at night when the frequency of use is low.

By the way, as the ozone generation part 8 of this embodiment, the production | generation means of the ozone gas by a discharge system, an ultraviolet system, etc. are used. Further, the fluid is not limited to ozone gas, and may be a fluid having a sterilizing component such as ethylene oxide or formaldehyde.

The ozone decomposition unit 81 may have any structure as long as it can decompose ozone, such as activated carbon, ultraviolet light, or a heater. Moreover, when using an ultraviolet-ray and a heater as an ozone decomposition part, it is preferable to control the ozone decomposition part 81 automatically by the control part 9. FIG. That is, when the sterilization state is maintained, the ozonolysis unit 81 is stopped, and when the sterilization is completed, the ozonolysis unit 81 is operated to decompose ozone.

In the sterilization mode, an ozone concentration detector may be separately provided to confirm that the concentration has been reduced to a safe concentration. In that case, for example, an ultraviolet ray absorption method can be used as an ozone concentration detection means, and the ozone concentration can be detected by measuring the absorbance by irradiating ultraviolet rays around a wavelength of 254 nm.

Furthermore, it can be achieved by using a semiconductor sensor as another ozone concentration detection means. That is, a semiconductor such as In2O3 or SnO3 is characterized in that the electric conductivity changes due to adsorption of ozone gas, and the ozone concentration is detected by measuring the change in electric resistance of the thin film obtained by oxidizing the thin film surface of the semiconductor with ozone. it can.

Furthermore, ozone is characterized by changing the blue color of indigo carmine used as a colorant to white, and this principle may be used to detect the ozone concentration. Of course, any means other than these can be used as long as the ozone concentration can be detected.

As described above, according to the water treatment apparatus 1 of the present embodiment, in the water flow mode, the raw water supplied from the raw water supply unit 2 is purified by the purification unit 4, and the purified water is Water is supplied to the cold water passage 31 and the heat water passage 32. Then, cold water can be discharged from the cold water discharge port 34 by opening the cold water discharge valve 33, while hot water can be discharged from the hot water discharge port 36 by opening the hot water discharge valve 35.

Next, in the sterilizing mode, the water in the purified water supply path 3 was once evacuated to the reservoir 5 to empty the purified water supply path 3, and the sterilizing fluid generator 8 generated the empty purified water supply path 3. Supply ozone gas and sterilize. When sterilization is completed, the bactericidal component of the bactericidal fluid in the purified water supply path 3 can be decomposed by the bactericidal component decomposing unit 81, and then the water evacuated in the storage unit 5 can be used again as raw water.

Therefore, since the water in the purified water supply path 3 can be evacuated to the storage unit 5 at the time of sterilization, the water removing operation becomes unnecessary, and the workability at the time of sterilization can be improved. In addition, since the evacuated water can be reused as raw water after sterilization is completed, economic efficiency can be enhanced.

Second Embodiment
FIG. 4 is a view showing a second embodiment of the present invention, and the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted to avoid duplication.

The water treatment apparatus 1A of the present embodiment is mainly different from the first embodiment in that the storage unit 5A also serves as a raw water supply unit.

That is, the water treatment apparatus 1A of the present embodiment eliminates the raw water feed channel 21 and the raw water feed valve 22 shown in the first embodiment, and purifies the raw water directly from the storage section 5A through the circulation feed channel 51. It is supposed to be taken into The other configuration is the same as that of the first embodiment.

Therefore, the storage unit 5A of the present embodiment has a volume equal to or greater than the combined volume of the raw water and the amount of water evacuated from the purified water supply path 3 in advance. Here, in order to distinguish storage part 5A of this embodiment from storage part 5 of a 1st embodiment, it explains below as raw water storage part 5A.

In the raw water storage unit 5A, the circulation water supply passage 51 is connected to the lower portion as in the first embodiment, but in this embodiment, the circulation water supply passage 51 is directly connected to the purification unit 4 and the circulation water supply passage A circulation pump P1 is provided in the middle of 51.

Thus, the raw water storage part 5A which served as the raw water supply part is provided with a door (not shown) for injecting the raw water. In this case, the door may be opened and the raw water may be directly injected into the raw water reservoir 5A, or a pipe (not shown) for injecting the raw water may be provided, and the pipe may be inserted from the opened door to feed the raw water. It may be injected. In this case, the raw water storage unit 5A does not necessarily have to be installed in the main body 11, and it is preferable that the door is closed except when the raw water is injected to block the inside of the raw water storage unit 5A from the outside air.

Of course, even in the present embodiment, there is a water flow mode and a sterilization mode, and when the water flow mode is selected by the operation panel, the circulation pump P1 is operated and stored in the raw water storage section 5A. Raw water is supplied to the purification unit 4 to be purified. Then, the purified water is supplied to the cold water passage 31 and the hot water passage 32 as in the first embodiment. Thereafter, the operation until the cold water outlet 34 and the hot water outlet 36 are discharged is the same as that of the first embodiment, and the description thereof is omitted here.

On the other hand, when the sterilization mode is selected by the operation panel, the temporary water supply pump P3 operates in the same manner as in the first embodiment, and the water in the purified water supply channel 3 is stored from the circulation channel 7 via the branch channel 71 It is evacuated to the part 5A. After that, the ozone gas generated by the ozone generation unit 8 is supplied to the empty clean water supply path 3 to sterilize it, and when sterilization is completed, the ozone decomposition unit 81 decomposes the ozone, and this sterilization process It is similar to the first embodiment.

Then, when the sterilization is completed, the operation of the circulation pump P1 introduces the water evacuated to the raw water storage unit 5A, that is, the water mixed with the original raw water into the purification unit 4 via the circulation water supply passage 51. The water of the raw water reservoir 5A can be used again as raw water.

As described above, according to the water treatment apparatus 1A of the present embodiment, it is a matter of course that the same effects as those of the first embodiment can be obtained, and additionally, the storage portion 5 of the first embodiment can be obtained. The raw water storage portion 5A also serves as a raw water supply portion. As a result, the raw water feed channel 21 and the raw water feed valve 22 (see FIG. 1) are unnecessary, and the water treatment apparatus 1A can be made compact.

Moreover, since the draw-in of the raw water supply channel 21 is eliminated in this way, the water treatment apparatus 1A can be made movable in combination with the downsizing, and the installation location of the apparatus can be easily changed if the power supply can be secured. become able to.

Third Embodiment
FIG. 5 is a view showing a third embodiment of the present invention, and the same components as those of the second embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

The water treatment apparatus 1B of this embodiment is mainly different from the second embodiment in that a backflow pump P4 as a water backflow unit is provided on the downstream side of the purification unit 4 and the water in the purified water supply path 3 is purified. It is because it was made to evacuate to the raw water storage part 5A as a storage part, making it backflow to 4.

At this time, since the circulation water supply passage 51 is connected to the upper part of the raw water storage unit 5A, when the water in the purified water supply path 3 is evacuated, it flows from the upper part of the raw water storage unit 5A. Further, the circulation path 7 connected to the flow path switching valve 37 is connected to the purified water outflow path 42 instead of the heat flow path 32, and the temporary water supply pump P3 (see FIG. 4) is eliminated. The other configuration is the same as that of the second embodiment.

Of course, even in the present embodiment, there is a water flow mode and a sterilization mode, and when the water flow mode is selected by the operation panel, the circulation pump P1 is operated and stored in the raw water storage section 5A. Raw water is supplied to the purification unit 4 to be purified. Then, the purified water that has been purified is supplied to the cold water passage 31 and the hot water passage 32, and then the operation until it is discharged from the cold water outlet 34 and the hot water outlet 36 corresponds to the second embodiment. It is similar.

On the other hand, when the sterilization mode is selected by the operation panel, the backflow pump P4 operates, and the water in the clean water supply passage 3 flows back from the cold water passage 31 to the purification unit 4 through the clean water outflow passage 42. Then, the water that has flowed back to the purification unit 4 is evacuated to the raw water storage unit 5A through the circulation water supply passage 51. At this time, the circulation pump P1 is stopped, and the backflowed water passes through the circulation pump P1.

Next, ozone gas generated by the ozone generation unit 8 is supplied to the empty clean water supply passage 3 for sterilization, and when sterilization is completed, ozone is decomposed by the ozone decomposition unit 81, and this sterilization is performed. The process is the same as in the second embodiment. And when sterilization is completed, the water evacuated to 5 A of raw water storage parts similarly to 2nd Embodiment can be used again as raw water.

As described above, according to the water treatment apparatus 1B of this embodiment, it goes without saying that the same effects as those of the second embodiment can be obtained, but in addition to this, the backflow pump P4 is provided to supply clean water. The water in the path 3 is transferred back to the purification unit 4 and transferred to the raw water storage unit 5A. As a result, there is no need to separately provide a flow path (branch path 71 in FIG. 4) for evacuating the water in the purified water supply path 3 to the raw water storage portion 5A, thereby suppressing the flow path from being complicated. Can.

In addition, since the purification unit 4 is reversely flowed when the water in the purified water supply path 3 is evacuated, clogging of the purification unit 4 can be removed by the backflow water, and the life of the purification unit 4 can be extended. .

Fourth Embodiment
FIG. 6 is a view showing a fourth embodiment of the present invention, and the same components as those of the third embodiment are indicated by the same reference numerals and the description thereof will be omitted.

The water treatment apparatus 1C of the present embodiment is mainly different from the third embodiment in that the raw water reservoir 5A as a reservoir is disposed below the purified water supply path 3.

That is, the water treatment apparatus 1C of the present embodiment arranges the raw water storage portion 5A in the direction of gravity below the cold water passage 31 which is empty at least when sterilizing the clean water supply passage 3 and places the water in the cold water passage 31 by gravity. It is made to evacuate to the raw water storage part 5A. As a result, the backflow pump P4 of the third embodiment becomes unnecessary, and the backflow pump P4 can be eliminated.

At this time, the water to be evacuated flows back through the purification unit 4 and flows into the circulation water supply channel 51. However, in the present embodiment, the circulation water supply channel 51 is cleaned with the purification unit 4 so as to easily flow from the purification unit 4 into the raw water storage unit 5A. Connected to the top of the And when sterilization is completed, the water evacuated to 5 A of raw water storage parts like the 3rd embodiment can be used again as raw water. In addition, when pumping up the water in the raw water storage part 5A to the purification part 4, it can carry out by using the pipe | tube with which the circulation pump P1 is provided although illustration is abbreviate | omitted in FIG. Therefore, it is preferable that the pipe of the circulation pump P1 be disposed in a state of extending to the lower part of the raw water reservoir 5A.

Thus, in the present embodiment, the upper and lower relationship between the raw water storage portion 5A and the purified water supply path 3 is specified, and basically the water treatment apparatus 1B of the third embodiment except for eliminating the backflow pump P4. It has the same configuration as

As described above, according to the water treatment apparatus 1C of this embodiment, it is needless to say that the same effects as those of the third embodiment can be obtained, and in addition to this, the raw water storage portion 5A is a purified water supply portion It is arranged below 3. Therefore, when the circulation pump P1 is stopped, the water in the purified water supply passage 3 is automatically evacuated to the raw water storage portion 5A by gravity. As a result, since the backflow pump P4 is not required, the structure of the water treatment apparatus 1C is simplified, and further downsizing and cost reduction can be achieved.

In the present embodiment, the feature portion is applied to the third embodiment. However, the present invention can be applied to the first and second embodiments.

As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible.

1, 1A, 1B, 1C water treatment apparatus 2 raw water supply unit 3 clean water supply path 4 purification unit 5 storage unit 5A raw water storage unit (storage unit)
8 sterilizing fluid generation unit 81 sterilizing component decomposition unit

Claims

Raw water supply department,
A purification unit for purifying the raw water supplied from the raw water supply unit and passing the purified water through a purified water supply path;
A reservoir capable of storing water at least in the purified water supply channel;
A sterilizing fluid generation unit capable of generating a sterilizing fluid containing a sterilizing component and supplying the sterilizing fluid into the purified water supply path;
And b) a sterilizing component decomposing unit for recovering the bactericidal fluid in the purified water supply channel at the end of the sterilization and decomposing the bactericidal component;
A water treatment apparatus characterized by transferring water in the purified water supply path to the storage unit at the time of sterilization of the purified water supply path.
The water treatment apparatus according to claim 1, wherein the storage unit doubles as the raw water supply unit.
The water treatment according to claim 1 or 2, characterized in that a water backflow unit is provided downstream of the purification unit to backflow water in the purified water supply path to the purification unit and transfer the water to the storage unit. apparatus.
The said storage part was arrange | positioned downward rather than the said purified water supply path | route, The water treatment apparatus of Claim 1 or 2 characterized by the above-mentioned.