JPH0929256A - Strongly acidic water production equipment - Google Patents

Abstract

(57) [Summary] [Purpose] The extraction flow rate of strongly acidic water can be selected in stages, and stable acidic strongly acidic water can be obtained. [Structure] A plurality of electrolytic cells 1a, 1b, 1c, 1d are provided. Water supply control valve 3 for supplying raw water to these electrolyzers
a, 3b, 3c, and 3d, respectively. Then, together with the flow rate selection means 19 for selecting the flow rate for taking out the strongly acidic water,
A water supply control valve control device 1 for controlling the opening / closing by appropriately selecting a water supply control valve according to the flow rate selected by the flow rate selection means 19.
6 is provided. Further, the water supply control valve selection history storage means 1 for storing the water supply control valve selection history in the water supply control valve control device 16.
7 and the water supply control valve priority selecting means 18 for giving priority to the ones having the longest blocking time at the time of selection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strongly acidic water producing apparatus for continuously producing strongly acidic water by electrolyzing tap water or the like to which saline is added.

[0002]

2. Description of the Related Art Strongly acidic water used as washing or sterilizing water is fed with raw water such as tap water containing salt solution as an electrolyte into an electrolytic cell of a strongly acidic water producing apparatus and electrolyzed by electrodes provided in the electrolytic cell. It is generated by doing.

And in this strongly acidic water producing apparatus,
Since the flow rate of the raw water and the electrolytic current flowing between the electrodes affect the pH value of the strongly acidic water produced, the pH of the strongly acidic water produced
In many cases, in order to stabilize the value of, the flow rate of raw water is adjusted to a predetermined value and the operation is performed so that the electrolysis current is not changed as much as possible.

[0004]

However, the same amount of strongly acidic water is not always used, and therefore an apparatus capable of adjusting the withdrawal flow rate of strongly acidic water is desired. Therefore, the above-mentioned conventional apparatus has room for improvement in these points.

In view of the above points, the present invention has an object of providing a strong acidic water producing apparatus capable of stepwise selecting the flow rate of strongly acidic water and obtaining stable acidic strong acidic water. And

[0006]

In order to achieve the above object, the present invention is directed to a strongly acidic water producing apparatus as set forth in claim 1, wherein the electrolytic cell is divided into two chambers, an anode side and a cathode side, by a diaphragm, Raw water added with saline as an electrolyte is supplied to the electrolyzer, and in the strongly acidic water production device that takes out strongly acidic water from the compartment on the anode side, a plurality of electrolyzers are provided, and a water supply control valve is provided in each electrolyzer. A water supply control valve control device for controlling opening / closing of the water supply control valve according to the flow rate selected by the flow rate selection means is provided. There is.

Further, the strongly acidic water producing apparatus according to claim 2 is provided with a water supply control valve selection history storing means for storing a history of selection of the water supply control valve in the water supply control valve control device, and when the water supply control valve is selected. The water supply control valve preferentially selecting means for preferentially selecting from the water supply control valves having a long closing time is characterized.

[0008]

According to the strongly acidic water production apparatus of the first aspect of the present invention, when strongly acidic water is produced, first, the withdrawal flow rate of strongly acidic water is selected through the flow rate selecting means in accordance with the amount used. In the flow rate selecting means, the selected flow rate value is sent to the water supply control valve control device, and the water supply control valve control device opens the water supply control valves respectively arranged in the plurality of electrolytic cells according to the sent flow rate value, It is designed so that a desired flow rate of strongly acidic water can be taken out.

According to the strongly acidic water producing apparatus of the second aspect, when the water supply control valve to be opened is selected, the water supply control valve priority selection means of the water supply control valve control device causes the water supply control valve selection history storage means. By referring to the stored selection history of the water supply control valve, the priority is given from the water supply control valve having a long closing time at the time of selection, and the water supply control valve to be opened is selected according to the priority. There is no bias in the operating time of the electrolytic cells, and the life of the electrodes of each electrolytic cell is averaged, so that stabilization of the quality and extension of the life of the electrodes can be expected.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a flow chart showing a processing flow of a strongly acidic water producing apparatus. Reference numerals 1a to 1d denote a plurality of electrolytic cells having an anode and a cathode, and the electrolytic cells 1a, 1b, 1c, 1 are provided.
A raw water supply pipe 2 for supplying raw water such as tap water is connected to d, and each raw water supply pipe 2 is provided with a water supply control valve 3a, 3b, 3c, 3d for controlling the supply and stop of the raw water. are doing. Further, a strong acidic water discharge pipe 4 is connected to the anode side and a strong alkaline water discharge pipe 5 is connected to the cathode side as discharge pipes for discharging generated water in each of the electrolytic cells 1a, 1b, 1c, 1d.

The raw water supply pipe 2 is provided with a raw water supply valve 6 for starting and stopping the supply of raw water, a pressure reducing valve 7 for adjusting the water pressure of the raw water, and a raw water flow control valve 8 for controlling the flow rate of the raw water. It is arranged to adjust the flow of raw water fed into the electrolytic cells 1a, 1b, 1c, 1d. The pressure reducing valve 7
Can make the fluctuating water pressure almost constant, which allows the raw water flow control valve 8 to more accurately control the flow rate.

A saline solution storage tank 9 stores saline solution, and is adapted to store saline solution adjusted to an appropriate concentration of about 20%. One end of a salt water addition pipe 10 is connected to the salt water storage tank 9, and the other end of the salt water addition pipe 10 is connected to the raw water supply pipe 2.

This connecting portion is located downstream of the raw water flow control valve 8 and the like, and saline is added after stabilizing the flow of raw water by these various control valves. The saline solution is added by the saline solution addition pump 11 arranged in the saline solution addition pipe 10. The amount of added saline solution is distributed to the raw water supply pipe 2 by the saline solution addition pump control device 12. Adjustment is performed by changing the number of revolutions of the salt solution addition pump 11 based on the raw water flow rate detected by the provided raw water flow rate sensor 13.

Reference numeral 14 denotes a saline diffusion tank arranged in the raw water supply pipe 2, in which raw water containing saline is injected from a lower portion of a cylindrical main body, and the raw water is supplied by a water flow while rising in the main body. The saline solution is diffused into the main body so that it overflows from the upper part of the main body, and is disposed downstream of the connecting portion of the saline solution adding pipe 10. The saline diffusion tank 14 may be one that stirs the raw water with a circulation pump or a stirring blade, or may be a simple tank.

Reference numerals 15a, 15b, 15c and 15d denote power supply devices for applying an electrolysis voltage to the electrodes of the electrolytic cells 1a, 1b, 1c and 1d, respectively, and the power supply devices apply a substantially constant voltage to the electrodes of the electrolytic cell. It has a constant voltage function to apply.

Reference numeral 16 denotes the water supply control valves 3a, 3b, 3c,
A water supply control valve control device for controlling opening and closing of 3d, comprising a storage device and software for storing the selection history in the storage device as water supply control valve selection history storage means 17 for storing the selection history of the water supply control valve, and blocking An arithmetic and control unit is provided as the water supply control valve priority selection means 18 for preferentially determining the selection order from the water supply control valve having a long time.

Further, the water supply control valve control device 16 is connected to a flow rate selecting means 19 for selecting a flow rate for taking out strongly acidic water, and the flow rate selecting means 19 is, for example, 2 liters per minute, 4 minutes per minute. It is composed of an operation switch for gradually selecting the flow rate of strongly acidic water, such as liter, 6 liters per minute, and 8 liters per minute, and a control circuit for outputting a selection signal according to the operation.

Therefore, when the strongly acidic water is produced by the strongly acidic water producing apparatus, the saline solution addition pump control device 12 is previously prepared.
An appropriate rotation speed of the saline solution addition pump 11 corresponding to the supply rate of the raw water is stored and set.

Further, the raw water feed valve 6 is opened, and the pressure reducing valve 7 and the raw water flow control valve 8 are adjusted so that the flow rate of each electrolytic cell is, for example, 2 liters per minute.
a, 3b, 3c and 3d are set in advance. In addition, the power supplies 15a, 15b, 15c,
15d is adjusted so that strongly acidic water having a desired pH can be taken out from each of the electrolytic cells 1a, 1b, 1c, 1d.

Then, the operation switch of the flow rate selection means 19 is operated to set a desired flow rate, for example, 2 liters per minute, and the raw water flow rate control valve 8 is set to this supply rate.
When the raw water supply is adjusted by adjusting the
b, 1c, and 1d, the capacity of one electrolytic cell is 2 liters per minute, so that the water supply control valve control device 16 automatically selects an appropriate electrolytic cell, for example, electrolytic cell 1a. The water supply control valve 3a is opened and the power supply device 15a is turned on, and 2 liters of strongly acidic water can be taken out per minute. Similarly, when the flow rate is set to 4 liters per minute, the electrolytic cells 1a, 1b, 1c, 1d
Two of them are selected appropriately and the water supply control valve is opened.

Further, the water supply control valve selection history storage means 17,
In the water supply control valve control device 16 having the water supply control valve priority selection means 18, the water supply control valve selection history storage means 17 is referred to, and the priority is high, that is, the water supply that has been closed for the longest time. A predetermined number of water supply control valves will be sequentially selected from the control valves. For example, the water supply control valve 3 of the electrolytic cell 1a
If a is closed for the longest time, it means that the operating time of this electrolyzer 1a is the shortest, so the water supply control valve 3a of this electrolyzer 1a is selected and opened with the highest priority, and 2 liters per minute are provided. Take out the strongly acidic water. Further, when the set flow rate is large, the water supply control valve having the next long closing time is selected.
If four electrolytic cells 1a, 1b, 1c, 1d are adopted in this way, the water supply control valves 3a, 3b, 3c,
The sequential selection of 3d produces up to 8 liters of acidic water per minute.

Further, when the production amount of the acidic water is reduced, the water supply control valve selection history storage means 17 is referred to select a water supply control valve having a short blocking time, that is, an electrolytic cell having a long operating time, and the water supply has priority. Each electrolyzer is used uniformly so that the life of the entire device is extended.

[0024]

As described above, according to the strongly acidic water producing apparatus of claim 1 of the present invention, a plurality of electrolytic cells 1a, 1b,
Water supply control valves 3a, 3b, 1c, 1d,
3c, 3d, and further, a flow rate selecting means 19 for selecting a flow rate for taking out strongly acidic water, and water supply control valves 3a, 3 according to the flow rate selected by the flow rate selecting means 19.
Since the water supply control valve control device 16 for controlling opening / closing by selecting b, 3c, or 3d is provided, it is possible to select a desired withdrawal flow rate of the strongly acidic water stepwise, and even if the withdrawal flow rate is changed. It is possible to take out strongly acidic water of stable quality.

According to the strongly acidic water producing apparatus of the present invention, the water supply control valve control device 16 for controlling the water supply control valves 3a, 3b, 3c, 3d is provided with the water supply control valve selection history storage means 17. In addition, since the water supply control valve priority selection means 18 is provided, when the water supply control valves 3a, 3b, 3c, 3d are selected according to the flow rate selected by the flow rate selection means 19, the water supply control valve with a long closing time is selected. Select with priority,
The operating time of each electrolytic cell can be averaged, and the life of the electrodes of each electrolytic cell can be averaged, so that stabilization of the quality and extension of the life of the apparatus can be expected.

[Brief description of drawings]

FIG. 1 is a flow chart showing an embodiment of the strongly acidic water producing apparatus of the present invention.

[Explanation of symbols]

1a, 1b, 1c, 1d ... Electrolysis tank 2 ... Raw water supply piping 3a, 3b, 3c, 3d ... Water supply control valve 16 ... Water supply control valve control device 17 ... Water supply control valve selection history storage means 18 ... Water supply control valve priority selection Means 19 ... Flow rate selecting means

Claims (2)

[Claims] 1. A strong acid in which an electrolytic cell is divided into two chambers, an anode side and a cathode side, by a diaphragm, raw water added with saline as an electrolyte is supplied to the electrolytic cell, and strongly acidic water is taken out from the compartment on the anode side. In the acidic water producing apparatus, a plurality of electrolyzers are provided, each electrolyzer is provided with a water supply control valve, and a flow rate selecting means for selecting a withdrawal flow rate of strongly acidic water is provided. A strong acid water production apparatus comprising a water supply control valve control device for controlling opening and closing of the water supply control valve according to the above. 2. A water supply control valve selection history storage means for storing a water supply control valve selection history in the water supply control valve control device,
2. The strong acid water producing apparatus according to claim 1, further comprising a water supply control valve priority selecting means for preferentially selecting a water supply control valve having a long closing time when the water supply control valve is selected.