JPH08126885A - Electrolytic water generator - Google Patents

Abstract

PURPOSE: To remove the deposit of calcium close to the upper part of a cathode compartment and in the discharge pipe of a cathode by stopping the addition of electrolyte during backward washing, providing a chemical adding tank contg. a chemical consisting of org. acid before an electrolytic cell and adding the chemicals to raw water. CONSTITUTION: When a valve 19 is opened, a part of raw water flows to an adding cylinder 16 through a water feed pipe 17, and chemicals stored in the cylinder are dissolved and supplied to a cathode compartment from a discharge pipe 18. Anodic water is generated in the cathode compartment and cathodic water in an anode compartment for backward washing. In the backward washing when a valve 8 is closed, each generated water stays in the cathode compartment or anode compartment, and the deposit is dissolved in the cathode compartment. Meanwhile, in the backward working when the valve 8 is opened, each generated water is discharged from the cathode compartment or anode compartment to clean the compartment. In this case, the calcium deposit generated in the normal running in a low-current-density region close to the upper part of the cathode compartment or in the discharge pipeline of the cathode is dissolved by the chemicals added to the cathode compartment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus mainly using anode water discharged from an anode chamber of an electrolyzed water producing apparatus using tap water as raw water. More specifically, the present invention relates to cleaning of deposits on the upper part of the cathode chamber and the discharge tube of the cathode chamber of the electrolytic cell of such an apparatus.

[0002]

2. Description of the Related Art In an electrolyzed water producing apparatus shown in FIG. 2, an electrolyzer 1 is divided into a cathode chamber 3 and an anode chamber 4 by a diaphragm 2, and electrodes 5 and 6 are inserted into the chambers of the respective husbands. After injecting raw water such as tap water openably and closably with the valve 8 and adding a predetermined amount of the electrolyte from the electrolyte supply tank 9 to the water supply pipe 10,
Water is supplied to the cathode and anode chambers through the water supply pipes 11 and 12 branched from the water supply pipe 10. The raw water such as tap water supplied into the cathode chamber is electrolyzed by passing a direct current 7 applied between the electrodes to electrolyze cathode water into the cathode chamber and electrolytically generate anode water into the anode chamber. The electrolyzed negative / anode water is discharged from the respective discharge pipes 13 and 14. The anode water discharge pipe 14 is provided with an electrode 15 of an ORP meter for checking the capacity of the discharged anode water.

Na as an electrolyte in raw water before being supplied to the electrolytic cell
When a halogen compound such as Cl or KCl is added at a constant ratio and electrolyzed in the electrolytic cell, the anions constituting the electrolyte move to the anode chamber. As a result, HCl is
It is possible to obtain low pH anodic water containing a large amount of anions having a disinfecting and sterilizing effect such as O and ClO ⁻ . Since this water has a disinfecting and sterilizing effect, it is used as cleaning water for disinfecting and sterilizing.

However, in an apparatus that mainly obtains such anode water, cathode water having a very high pH is discharged along with the anode water. Although there are Ca ions in raw water such as tap water, Ca ions precipitate in the high pH region as calcium carbonate or calcium hydroxide, and gradually block the upper part of the electrolytic cell or the discharge pipe line.

For this reason, the inflow of electrolyte into the electrolytic cell is stopped every time water is discharged for a certain period of time, and backwashing is performed to reverse the direction of the voltage applied to the negative and positive electrodes so that the negative electrode and cathode water in the negative electrode chamber are washed. The calcium salt that precipitates is washed and dissolved. As a result, the adhered calcium carbonate and calcium hydroxide are dissolved. However, even if the above cleaning is performed by this method, the region with a low electrolytic current density near the upper part of the cathode chamber, the cathode discharge tube, and the like are not sufficiently backwashed, and the cleaning effect is difficult to obtain. Further, if the backwashing is intended to be performed only for a long time, the backwashing must be performed for a long time, and the electrolysis current during this period is wasted.

[0006]

SUMMARY OF THE INVENTION Therefore, according to the present invention, in an apparatus that mainly uses anode water, a chemical solution addition tank is provided in front of the cathode chamber of the electrolytic cell, and a chemical agent containing an organic acid is stored in the chemical solution addition tank. Then, during the backwashing, while stopping the addition of the electrolyte to the raw water, by adding the above chemicals to the raw water and supplying it, the pH of the raw water to be supplied to the cathode chamber is lowered and supplied, It is intended to remove calcium deposits near the upper part of the chamber and in the cathode discharge tube.

[0007]

The electrolyzed water producing apparatus of the present invention is provided with a means for supplying an electrolyte to the raw water supply side of an electrolytic cell, and is divided by an ion-permeable diaphragm to form a cathode chamber into which a negative electrode is inserted. In an electrolyzed water generator for electrolyzing raw water continuously flowing into an electrolytic cell by applying a DC voltage between the positive and negative electrodes and the positive and negative electrodes, and between the above means and the cathode chamber side of the electrolytic cell. A flow path branched from the raw water supply pipe is provided, and a chemical supply means is provided in the flow path to stop the electrolyte supply at least when backwashing the electrolytic cell, and the organic acid is supplied from the chemical supply means to the cathode chamber. The purpose is to backwash the raw water containing the chemicals without adding the electrolyte to the raw water.

[0008]

In the present invention, the function of supplying the electrolyte to the raw water is stopped during the backwash, and by supplying the raw water with the chemical added to the cathode chamber, the electrolytic current in the vicinity of the upper part of the cathode chamber can be formed during the normal operation. It is possible to dissolve the calcium precipitate in the low density region and the cathode discharge tube.

In addition, during normal operation, the disinfecting and sterilizing cleaning water can be obtained by adding the electrolyte in the raw water.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is an embodiment of the present invention contrasted with FIG. The description of the operation overlapping with that of FIG. 2 is omitted.

In the figure, 1 is an electrolysis tank, 8 is a valve for opening and closing the inflow of raw water such as tap water, and 10 is a water supply pipe through which water mixed with an electrolyte added to the raw water from an electrolyte supply tank 9 flows. Yes, 11 and 12 are water supply pipes for supplying raw water mixed with the electrolyte to the cathode chamber and the anode chamber of the electrolytic cell, 13 is a discharge pipe of the cathode chamber, 14 is a discharge pipe of the anode chamber, Reference numeral 15 is an electrode of an ORP meter for confirming the performance of anode water discharge disposed in the middle of the discharge pipe 14,
Reference numeral 16 denotes an addition cylinder which is arranged between the electrolyte supply tank 9 and the cathode chamber and which constitutes a medicine supply means for inserting a medicine through a water supply pipe 17 branched from the water supply pipe 10, and an outflow pipe 18 thereof. Reference numeral 19 is a valve that opens and closes the raw water supplied to the medicine.

Upon backwashing, the addition of electrolyte is stopped.
When the valve 19 is opened, part of the raw water is supplied to the water supply pipe 17
To the cathode chamber through the outflow pipe 18 when the drug is stored in the addition cylinder. The water supplied from the outflow pipe 18 and supplied with the chemical is supplied to the cathode chamber via the water supply pipe 20, but at this time, since the pressure is lower than that of the raw water supplied via the water supply pipes 11 and 20, the chemical is discharged. There is no risk of being supplied to the anode chamber via the water supply pipe 12.

Since the electrolytic cell is backwashed, positive and negative voltages are applied to the negative and positive electrodes for normal operation. For this reason,
Anode water is generated in the cathode chamber and cathode water is generated in the anode chamber.
In backwashing with the valve 8 closed, each produced water stays in the cathode chamber or the anode chamber, and the volume in the chamber is dissolved in the cathode chamber. Further, in backwashing with the valve 8 open, each produced water is discharged from the cathode chamber or the anode chamber for washing.

At this time, the chemical agent added to the cathode chamber can dissolve calcium deposits in the region where the electrolytic current density is small near the upper portion of the cathode chamber and in the cathode discharge pipe, which are formed during normal operation.

The valve 19 can be removed by putting the chemical in the addition cylinder only during the backwash.
That is, the supply of the electrolyte is stopped and the chemical is supplied to the addition cylinder prior to the backwash. After that, the valve 8 is opened to supply raw water to supply the chemicals to the cathode chamber.

Organic acids are used as drugs. Malic acid and succinic acid can be used as the organic acid, but citric acid is preferably used.

The addition cylinder into which the drug is inserted is a hermetically sealed container, and for example, the above-mentioned crystalline citric acid is packed before backwashing. Thereby, the organic acid can be supplied only during the backwashing period. The supply amount of the medicine can be arbitrarily set depending on the size of the addition cylinder.

[0018]

According to the structure of the present invention, the function of supplying the electrolyte is stopped during the backwashing, and the chemical solution is added to the raw water to supply it to the cathode chamber. It is possible to dissolve the calcium precipitate in the region of low electrolytic current density or in the cathode discharge pipe.

As a result, it is possible to positively obtain the sterilizing and sterilizing cleaning water by adding the electrolyte to the water flowing into the electrolytic cell and electrolyzing it, if desired, without maintaining the apparatus for a long period of time.

[Brief description of drawings]

FIG. 1 is an example of an electrolyzed water generator according to the present invention.

FIG. 2 is a conventional example of an electrolyzed water generator.

[Explanation of symbols]

 1 Electrolyzer 9 Electrolyte Supply Tank 10 Water Supply Pipe 11 Water Supply Pipe 12 Water Supply Pipe 15 ORP Meter Electrode 16 Addition Tube 18 Outlet 19 Valve

Claims (1)

[Claims] 1. A means for supplying an electrolyte to a raw water supply side of an electrolysis cell, and a space between the cathode and the cathode, which is divided by an ion-permeable diaphragm and has a cathode and an anode, in which a cathode and an anode are inserted. In an electrolyzed water generator for applying a DC voltage to electrolyze raw water continuously flowing into an electrolytic cell, a flow path branched from a raw water supply pipe is provided between the means and the cathode chamber side of the electrolytic cell, When the chemical supply means is provided in the flow path and at least the electrolytic cell is backwashed, the supply of the electrolyte is stopped, and the organic acid is supplied to the cathode chamber from the chemical supply means, and the chemical is supplied without adding the electrolyte to the raw water. An electrolyzed water generator characterized in that backwashing is carried out in a state containing water.