JPS596980A - Water purifier - Google Patents

Abstract

PURPOSE:To make the titled purifier equipped with a means for washing a membrane, while reducing the number of additional parts, by providing a switch valve in a line for discharging condensed water, and connecting said switch valve to a substitution tank. CONSTITUTION:In the water purifier equipped with a system for substituting clear water, a three-way switch valve 53 is provided between a pressure-regulating valve 29 and a discharging opening 27 in a line 25 for discharging condensed water and connected to a substitution tank 37. Thus, by pouring washing water into the substitution tank instead of said clear water, the washing water is circulated between the substitution tank and a separator to clarify the separator. Consequently, the clarification can be extremely easily performed.

Description

[Detailed description of the invention] This invention relates to improvements in water purification devices.

There is a water purification device equipped with an acidic cellulose-based semipermeable membrane (hereinafter referred to as semipermeable membrane) as a separating membrane in a separator. In this device N, the raw water in the separator is
There is a so-called fresh water replacement system in which water is replaced with separated fresh water to alleviate hydrolysis of the semipermeable membrane and thereby extend the life of the semipermeable membrane.

First, this conventional yuzu water purification device will be explained based on FIG. 1.

In Figure 1, 11 is the water intake, and the water purification device uses raw water]
−3. A filter 15 removes dust, sand, etc. from the raw water. F is a three-way switching valve, which allows the flow of water to flow into the separator 21 via a pump 19 driven by a switching motor 23 and a flow from a displacement tank 37 (described later). . The separator 21 is equipped with an acetic acid cellulose-based σ) semi-membrane as a part N111 to separate raw water into fresh water and concentrated water.

25 is the CJ concentrated water discharge line, and 27 is the drain port. 2
A pressure regulating valve 9 regulates the water pressure within the separator 21. The fresh water tank 31 stores the fresh water separated by the separator 21. Fresh water is taken out from the spout 33 via the valve 35 and used for drinking purposes. 37 is an i4 exchange tank, which is connected to the fresh water tank 31 via a valve 39, and its downstream side is connected to the two-way exchange valve 17. This displacement tank 37 temporarily stores the fresh water flowing in from the fresh water tank 31. When the water purification device is stopped, the fresh water stored here is guided into the separator 21 by a pump, and the raw water therein is converted into fresh water. Replace with That is,
The displacement tank 37, the pump 19, the pump 421, and the line connecting these constitute a water extinguishing system. This purifier 71 (INN system) converts the raw water in the separator 21 into clean water by 1% before stopping the water purifier.
The purpose is to extend the life of the separation membrane by alleviating hydrolysis of the separation membrane while the device is stopped. In addition,
41 is a drain, which is connected to the storage tank 3 via a valve 43.
It is provided at the bottom of 7. By the way, in this device 13, the surface of the semipermeable membrane that comes into contact with the raw water is likely to be contaminated with raw water.

If dirt adheres to the semipermeable membrane, the ability to separate raw water decreases, so it is essential to clean the semipermeable membrane.

However, since the conventional water purification device 13 was not equipped with a cleaning device, when cleaning the semipermeable membrane, only the separator 21 was removed from the front 13 of the water purification device, and the cleaning liquid tank 101 was removed as shown in FIG. A washing water circulation device 100 including a washing pump 102 and a washing pump 102 is separately prepared, and these are connected for washing. As a result, cleaning the semipermeable membrane was extremely troublesome.

This invention was made based on such circumstances,
The purpose is to reduce the number of additional parts and provide a cleaning device in a water purification device equipped with a fresh water replacement system.

This objective can be quickly achieved by providing a switching valve in the concentrated water extraction line in a water purification apparatus equipped with a clean water replacement system and connecting this switching valve to a replacement tank.

Embodiments of this invention will now be described with reference to FIGS. 2 to 4.

In this embodiment, the water intake port 11° filter 15 of the water purification system w51. Three-way switching valve 17. Pump 19゜Motor 231
Separator 21. Concentrated water discharge line 25° pressure regulating valve 29.
Fresh water tank 31. The structure and operation of the retrieval tank 37 and the like are the same as those of the prior art example described above, so a description thereof will be omitted.

53 is a three-way switching valve, which is provided between the pressure regulating valve 29 and the discharge port 27 in the concentrated water discharge line 25. The other port of the three-way switching valve 53 is connected to the displacement tank 37. This three-way switching valve 53 opens the line between the separator 21 and the discharge port 27 when purifying raw water and replacing fresh water, and also opens the line between the separator 21 and the outlet 27.
When cleaning the semipermeable membrane inside, the line between the separator 21 and the displacement tank 37 is opened.

Note that the replacement tank 37 is constantly filled with fresh water with the valve 39 open.

Also, when cleaning the semipermeable membrane in the separator 21, 0.5 to 2. o.

% (by weight) of a cleaning solution such as a citric acid solution.

Next, the separation membrane cleaning action of this water purifier 51 will be explained.

First, the three-way switching valve 17 is connected to the displacement tank 37 and the separator 21.
and the three-way switching valve 5 so that the line is open.
3 is switched so that the line between the separator 21 and the displacement tank 37 is opened. Then, the valve 43 is opened, the fresh water in the replacement tank 37 is drained from the drain 41, and the cleaning liquid is poured in its place. If the pump 19 is operated in this state, the cleaning liquid in the displacement tank 37 will switch over to the three-way switching valve 17.
... is poured into the separator 21, and after cleaning the semipermeable membrane, it returns to the 16-tank tank 37 through the three-way switching valve 53. That is, the cleaning liquid continues to circulate between the displacement tank 37 and the separator 21, and continues to clean the semipermeable membrane of 14'/l 8a21.

FIG. 3 shows another embodiment of the invention. This embodiment uses a solenoid valve A instead of the three-way switching valve 17 in the previous embodiment.
1 and A2, m magnetic valve Bl instead of three-way switching valve 53
and BJL, these valves Al.

The opening/closing of A+Bt+B2- and the driving of the motor 23 are performed on the Shimaken side 1 based on the circuit shown in No. 4N.

Next, this sequence control will be explained based on FIG. 4.

When performing water purification first, set the selector switch 61 to 1≠
After connecting to point 63, operate switch 65 to connect relay R.
2 is activated. Relay R1- is activated) and the contacts of this relay R2al, Rza, +, Rxa R2a4
A current flows through the solenoid valve A+ and the solenoid valve B, and the motor 23 is driven. Therefore, the operation of the pump 19 causes the garden water to flow into the separator 21 , and the separated concentrated water flows from the separator 21 toward the discharge port 27 via the admixed water discharge line 25 .

Second, when performing water extinguishing prior to stopping d-1 of the water purifier 51, the interlocking switch 69 is operated while the changeover switch 61 is connected to the contact 63. Then, the switch 691 is opened and the operation of the relay R (4D+7')) is stopped, and the switch 692 is closed and the relays R and 3 are activated. Then, contacts Rλat and Rzaλ of relay R1.

Because current flows through ..., solenoid valve A1 and solenoid valve E+ are closed, but relay R, ? Contact point Raal,
R, 3&2. Since current flows through R, 3a3° and R3a, the electric 4H valve A2- and the solenoid valve B+ are opened and the motor 23 is driven. Therefore, by the operation of the pump 19, the clean water from the displacement tank 37 is poured into the separator 21, and the purified water in the separator 21 is replaced by this clean water G and flows in the discharge direction 27.fj Oh, if the operating time set by the clean water replacement timer T is exceeded, the contact TI will open and stop the operation.

Thirdly, when cleaning the semipermeable membrane of the separator 2, the changeover switch 61 is connected to the contact 77 and the relay R+ is activated. When relay R1 is activated, contact R+ of this relay
a+, R+az, R1a? , , so that only the solenoid valves A and B2 open, and the motor 23
is driven. Therefore, the cleaning liquid from the displacement tank 37 is flowed into the separator 21 by the operation of the pump 19, and the cleaning liquid after cleaning the semipermeable membrane of the separator 21 is replaced via the concentrated water discharge line 25 and the three-way switching valve 53. It circulates in the direction of tank 37.

As described above, the water purification device according to the present invention has a switching valve j'74'j in the concentrated water discharge line in the water purification device a equipped with a fresh water replacement system, and a switching valve ff+: 4mj with this switching valve.
Since the tank is connected, washing water can be put into the displacement tank instead of fresh water, and the washing water can be circulated between the displacement tank and the separator to clean the dispenser. Therefore, unlike the conventional method, cleaning of the semi-transparent membrane σ1 becomes extremely easy.

Furthermore, in this invention, the equipment provided as the fresh water replacement system can also be used as a major part of the cleaning system, so that a cleaning system can be provided in the water purification device by adding only a few parts.

[Brief explanation of the drawing]

Fig. 1 is a flow chart of a conventional water purification device, Fig. 2 is a flow chart of a practical example of a water purification device according to the present invention, Fig. 3 is a flow chart of a practical example of the same value, and Fig. 4 is a flow chart of a practical example of the water purification device according to the present invention. 1 is a sequence circuit diagram of the flowchart shown in FIG. 17.53...Switching valve, 19...Pump. 21.Separator, 25.ψ concentrated water discharge line,
31+1・Fresh water tank, 37...) 4 exchange tank,
51...Water purification device

Claims (1)

[Scope of Claims] 1) A pump that flows raw water into the device, a switching valve provided upstream of this pump, and a cellulose thread for removing raw water that separates the raw water that is not flowed into fresh water and concentrated water by the pump at the mouth. A molecular a device provided as a semi-permeable total separation membrane, a concentrated water discharge line for discharging concentrated water separated by this separator,
A water purification system comprising: a fresh water tank for storing fresh water separated by the separator; and a displacement tank connected to the fresh water tank; the km tank is connected to the switching valve; A water purification device in which a switching valve is provided in the tank, and the switching valve and the displacement tank are connected.