JP3085356U - Sterilization water production equipment - Google Patents

Abstract

(57) [Summary] (Modified) [PROBLEMS] To provide a sterilizing water producing apparatus for safely supplying hypochlorous acid sterilizing water having an appropriate pH. Kind Code: A1 A sterilizing water producing apparatus includes a water passage, a first chemical liquid adding apparatus for adding an aqueous solution of sodium hypochlorite or sodium chlorite, and a first chemical liquid adding apparatus for adding an acidic aqueous solution such as hydrochloric acid or acetic acid. It includes a two-chemical-solution adding device 4 and a control unit 26. The first chemical is added to one raw water of the Futamata branch of the water flow path and diluted in the dilution tank 23, and the second chemical is added to the other raw water and diluted in the dilution tank 24. The two kinds of diluted chemicals are mixed in the mixing tank 25 and discharged as sterilized water. The control unit controls the addition amounts of the first and second chemical liquids based on the flow rate of the raw water, and closes the flow of the raw water by detecting an abnormal pH value of the sterilizing water. The check valve 18 of the first chemical liquid addition section is disposed at a position where the Hastelloy spring of the check valve does not contact the high concentration sodium hypochlorite, and the check valve of the second chemical liquid addition section has the base and the tip of the chemical liquid passage. Equipped with a double check valve.

Description

[Detailed description of the invention]

[0101]

[Technical field to which the invention belongs]

 The present invention relates to a sterilizing water producing apparatus in which water containing hydrochloric acid or acetic acid is mixed with water containing sodium hypochlorite or sodium chlorite.

[0092]

[Problems to be solved by the invention]

 Sterilized water containing hypochlorous acid is widely used in the food industry, medical industry, etc. since it has strong sterilizing power and has little concern about toxicity.

As one of apparatuses for producing this hypochlorous acid sterilizing water, an apparatus for adding and mixing an acidic aqueous solution such as sodium hypochlorite and hydrochloric acid to raw water such as tap water is known. Since the stability of hypochlorite varies greatly depending on the pH of the sterilized water, the pH value changes if the mixing ratio or dilution ratio of the additive chemicals such as sodium hypochlorite and hydrochloric acid is incorrect, and the desired sterilized water cannot be used. No longer available. Also, if sodium hypochlorite and hydrochloric acid come into direct contact with each other at high concentration, toxic chlorine gas is generated, which is dangerous.

Therefore, the first object of the present invention is to mix each chemical solution with the raw water well in the process of producing sterilizing water, and to always safely supply hypochlorous acid sterilizing water having an appropriate pH. It is to provide an apparatus for producing sterilized water.

By the way, when a check valve is used in a supply path of sodium hypochlorite in this type of apparatus, conventionally, a metal spring such as Hastelloy which urges the check valve of the check valve has a high concentration. When the flow of raw water and chemicals is stopped (when operation is stopped), sodium hypochlorite reacts with sodium hypochlorite due to a chemical reaction between sodium hypochlorite and Hastelloy spring material. It became gaseous, and it took a long time from the restart of operation to the stable pH.

Therefore, a second object of the present invention is to provide the above sterilizing water producing apparatus capable of shortening the pH stabilization time upon resumption by suppressing the gasification of the sodium hypochlorite addition supply section. To provide.

Further, when a check valve is used in the supply path for adding hydrochloric acid of this type of apparatus, a check valve having a structure in which a single check valve is provided at the rear of a chemical solution passage of a valve casing having a long chemical solution passage conventionally. Is used. For this reason, when the flow of the raw water and the chemical solution was stopped, the hydrochloric acid in the chemical solution passage penetrated into the accumulated raw water and the pH value dropped, and it took a certain amount of time for the pH to stabilize when operation was resumed. .

Accordingly, a third object of the present invention is to provide the above sterilizing water producing apparatus having a structure in which the hydrochloric acid in the chemical liquid passage of the check valve does not permeate the accumulated raw water when the operation is stopped.

If the adding devices for sodium hypochlorite and hydrochloric acid are arranged vertically, there is a risk that the chemical solution leaking from the upper adding device may mix with the chemical solution of the lower adding device. Therefore, a fourth object of the present invention is to provide the above-mentioned sterilized water producing apparatus in which a chemical solution adding device is arranged so that leaked chemical solutions are not mixed.

In order to achieve the first object, the sterilizing water producing apparatus according to the present invention branches the middle of a pipe through which raw water flows into a first branch and a second branch, and the two branches are divided into two branches. A water passage for discharging through a merging passage where the branch passage is merged; an electromagnetic on-off valve provided for the water passage; and a signal output by detecting the flow rate of raw water flowing inside the water passage provided in the water passage. A flow meter, a first chemical liquid tank for storing a first chemical liquid containing sodium hypochlorite or sodium chlorite as a main component, and a first chemical liquid tank connected to the first branch passage through a first pump. A first chemical liquid adding device for supplying a chemical liquid in a first chemical liquid tank to the raw water in the first branch path; and a first check provided at a connection between the first supply path and the first branch path. A valve; a first chemical liquid mixing tank interposed at or downstream of the first supply path connecting portion of the first branch path; and hydrochloric acid or acetic acid A second chemical solution tank for storing a second chemical solution having as a main component a second chemical solution tank, and a second supply passage connected to a second branch passage with a second pump interposed therebetween. A second chemical liquid adding device for adding to the raw water of the two branch passage; a second check valve provided at a connection portion between the second supply passage and the second branch passage; a second supply passage connection portion or a downstream side of the second branch passage A third mixing tank interposed in the merging flow path of the water flow path; and a pH of the sterilizing water that is provided downstream of the third mixing tank in the merging flow path and flows through the inside. A pH meter that detects and outputs a value; controls the first pump and the second pump based on a signal from the flow meter, and closes the electric open / close valve based on a signal from the pH meter. And a control device.

[0111] In order to achieve the second object, the sterilizing water producing apparatus of the present invention branches the middle of a pipe through which raw water flows into a first branch and a second branch, and the two branches are divided into two. A water passage for discharging through a merging passage where the branch passages are joined; an electric on-off valve provided for the water passage; and a signal output by detecting the flow rate of the water passage provided for the water passage. A flow meter; a first chemical liquid tank containing a first chemical liquid containing hydrochloric acid or acetic acid as a main component, and a first supply path connected to the first branch path through a first pump. A first chemical liquid adding device for adding the chemical liquid in the first chemical liquid tank to the raw water in the first branch path; a first check valve provided at a connection between the first supply path and the first branch path; (1) a first chemical liquid mixing tank interposed at the supply path connection part or a downstream side thereof; and sodium hypochlorite or sodium chlorite. A second chemical liquid tank for storing a second chemical liquid as a main component; and a second supply path connected to a second branch path with a second pump interposed therebetween. A second chemical liquid adding device for adding to the raw water of the branch; a second check valve provided at a connection between the second supply path and the second branch; a second supply path connection of the second branch or a downstream side thereof; A third chemical mixing tank interposed in the merging flow path of the water flow path; and a pH value of sterilizing water provided downstream of the third mixing tank in the merging flow path and flowing through the inside. A pH meter that detects and outputs a signal; and controls the first pump and the second pump based on a signal from the flow meter, and closes the electric open / close valve based on a signal from the pH meter. And a control device; wherein the first check valve is a casing having a check valve in the internal chemical liquid passage. A hollow extension projecting into the first branch or the inside of the first chemical liquid mixing tank is provided at the end, the valve rod of the check valve extends to the hollow extension, and a first side is provided on a side surface of the hollow extension. A water passage for passing the water of the branch passage is formed, and a metal spring that engages with the valve rod and urges the check valve is provided in the hollow extension.

In order to achieve the third object, the present invention provides the above sterilization water producing apparatus, wherein the structure of the second check valve is a main check valve in which a spring is urged to a rear portion of an inner chemical solution passage of a casing. And an auxiliary check valve biased by a spring is provided at the distal end of the chemical liquid passage facing the second branch or the second mixing tank.

In order to achieve the fourth object, the present invention provides the above sterilizing water producing apparatus, wherein the first chemical liquid adding apparatus and the first chemical liquid adding apparatus are individually partitioned in a casing of the sterilizing water producing apparatus. It is arranged in chambers arranged side by side, and each chamber is provided with a leak sensor for detecting a leak of a chemical solution of each chemical solution adding device and an alarm which operates based on a detection signal of the leak sensor. Features.

[0141]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, a sterilizing water producing apparatus 1 according to the present invention includes a water passage 2 through which raw water such as tap water passes, and sodium hypochlorite or sodium chlorite as raw water flowing through the water passage 2. Basically, there is provided a first chemical liquid adding device 3 for adding an aqueous solution of water and a second chemical liquid adding device 4 for adding an acidic aqueous solution such as hydrochloric acid or acetic acid. The first chemical liquid adding device 3 and the second chemical liquid adding device 4 are compactly accommodated in a casing 5 and are configured as an integrated unit.

The water flow path 2 branches the middle of the raw water pipe 6 connected to a water pipe or the like into a first branch 7 and a second branch 8, and the first branch 7 and the second branch 8 Is joined to the junction 9, and the tip of the junction 9 is drawn out of the casing 5 to form a water discharge section.

In the water flow path 2, the upstream and downstream raw water pipes 6 of the first and second branch paths 7 and 8 are provided with a motor-operated on-off valve 10 such as a solenoid valve and a motor valve. A flow switch 11 for detecting and outputting a signal, a flow meter 12 for detecting the presence or absence of a flow of raw water and outputting a signal, a constant flow valve 13, and a pH value of sterilizing water flowing through the flow passage 9 are detected. A pH meter 14 for outputting a signal is provided.

The first chemical liquid adding device 3 comprises a first chemical liquid tank 15 containing an alkaline first chemical liquid containing sodium hypochlorite or sodium chlorite as a main component, and a first chemical liquid tank 15. It has a first supply path 16 connected to the first branch path 7 of the water flow path 2, and a first pump 17 interposed in the first supply path 16, and the first supply path 16 and the first branch path 7 The first check valve 18 is provided at the connection part of the first check valve. In the embodiment shown in the figure, a first chemical liquid tank 15 contains an alkaline first chemical liquid containing sodium hypochlorite (NaClO) as a main component, and is sent out by a first pump 17 of a first supply path 16. Sodium hypochlorite (first chemical solution) is poured and added to raw water flowing through the first branch 7 of the water passage 2 through the first check valve 18.

The second chemical liquid adding device 4 includes a second chemical liquid tank 19 containing an acidic second chemical liquid mainly composed of hydrochloric acid or acetic acid, and a second branch of the water passage 2 from the second chemical liquid tank 19. A second supply passage 20 connected to the passage 8, and a second pump 21 interposed in the second supply passage 20. A second check valve is provided at a connection portion between the second supply passage 20 and the second branch passage 8. 22 are provided. In the embodiment shown in the figure, a second chemical solution tank 19 contains an acidic second chemical solution containing hydrochloric acid (HCl) as a main component, and hydrochloric acid (second chemical solution) sent out by a second pump 21 of a second supply path 20. ) Is injected and added to the raw water flowing through the second branch 8 of the water passage 2 through the second check valve 22.

A first chemical liquid mixing tank 23 is interposed downstream of the first supply path connection portion of the first branch path 7, and the first chemical liquid (the next chemical liquid) added to the raw water flowing through the first branch path 7 Sodium chlorite is mixed well with the raw water in the first chemical liquid mixing tank 23 so as to be uniformly diluted.

On the other hand, a mixing tank 24 for the second chemical liquid is interposed downstream of the second supply path connecting portion of the second branch path 8, and the second chemical liquid added to the raw water flowing through the second branch path 8. (Hydrochloric acid) is mixed well with the raw water in the second chemical liquid mixing tank 24 so as to be uniformly diluted.

Further, a third mixing tank 25 is provided in the merging passage 9 of the water flow passage 2, and the aqueous solution diluted with sodium hypochlorite from the first branch 7 and the aqueous solution diluted with hydrochloric acid from the second branch 8 are provided. The liquid is mixed well in the third mixing tank 25.

The sterilizing water producing device 1 controls the first pump 17 of the first chemical liquid adding device 3 and the second pump 21 of the second chemical liquid adding device in response to the flow rate of the raw water, and also controls the generated sterilizing water. When the pH value of the water exceeds a preset range, a control unit 26 for stopping the water flow in the water flow path 2 and issuing an alarm is provided. An input unit 27 for setting operating conditions, a pH display unit 28 for displaying a measured value of the pH meter 14, and a warning unit 29 such as an alarm or display for notifying pH abnormality are connected. A liquid crystal panel is used for the display surface.

The control section 26 receives and stores a desired pH set value of the sterilized water from the input section 27 and receives detection signals from the flow meter 12 and the pH meter 14. In response to the signal (flow rate) of the flow meter 12, the amounts of sodium hypochlorite and hydrochloric acid required to obtain sterilized water having a desired pH are calculated, and the first pump 17 is calculated based on the calculated values. In addition to controlling the supply amount of the second pump 21 and comparing the pH value signal input from the pH meter 14 with a set value and deviating from a predetermined range, a stop signal is sent to the electromagnetic on-off valve 10 of the water passage 2. Also, an alarm activation signal is sent to the alarm means 29.

The control unit 26 receives water flow information (a signal indicating the presence or absence of water flow) from the flow switch 11 provided in the water flow path 2, and outputs a sterilization water production device 1 by a water flow stop signal. Power supply, or at least the first pump 17 of the first chemical liquid addition device 3 and the second pump 18 of the first chemical liquid addition device 4 are stopped, and a check function when the flow meter 12 malfunctions is provided. I try to do it.

Next, the operation of the sterilizing water producing device 1 will be described. When the electric open / close valve 10 of the water passage 2 is opened, the raw water flows from the raw water pipe 6 of the water passage 2 into the first branch 7 and the second branch 8, and is discharged through the junction 9. .

At this time, when the flow meter 12 detects the raw water flow rate and inputs the detected raw water flow rate to the control unit 26, the control unit 26 controls the hypochlorous acid necessary to obtain sterilized water having a desired pH based on the detected raw water amount. The addition amounts of sodium and hydrochloric acid are calculated, and the first pump 17 and the second pump 21 control the chemical solution feed amounts based on the calculated values. As a result, the amount of sodium hypochlorite necessary for obtaining sterilized water having a desired pH value is added to the raw water flowing through the first branch 7 from the first chemical liquid tank 15, and the mixture is mixed in the first mixing tank 23. At the same time, hydrochloric acid is added to the raw water flowing through the second branch 8 from the second chemical solution tank 19 in an amount necessary to obtain sterilizing water having a desired pH value, and mixed in the second mixing tank 24. You.

The diluted sodium hypochlorite aqueous solution in the first branch 7 and the aqueous hydrochloric acid diluted aqueous solution in the second branch 8 mixed at a predetermined mixing ratio merge into the merged channel 9 and then into the third mixing tank. The mixture is mixed at 25 and discharged as hypochlorite sterilizing water having a predetermined pH value.

The pH value of the sterilizing water flowing through the merging channel 9 is constantly detected by the pH meter, and the detection signal is sent to the control unit 26. The control unit 26 compares the pH information sent from the pH meter 14 with the set pH value, and sends a close signal to the electromagnetic on-off valve 10 when the detected pH value of the sterilized water is out of the set pH value due to some trouble. To stop the operation of the sterilizing water producing apparatus. The alarm means 29 may be operated together with or instead of stopping the operation of the device.

As described above, the connection between the first supply path 16 to which sodium hypochlorite is added and the first branch path 7 (the first mixing tank 23 in the figure) is provided with a valve body made of a metal spring such as Hastelloy. The first check valve 18 is used to prevent gasification of hypochlorous acid due to a chemical reaction between high concentration sodium hypochlorite and Hastelloy. It has the following structure.

That is, the first check valve 18 used in the device of the present invention is provided with a check valve 32 in the internal chemical liquid passage 31 of the valve casing 30 and a first branch at the distal end side of the valve casing 30. A hollow extension 33 projecting into the water passage of the passage 7 is provided integrally, and a valve rod 34 of the check valve 32 extends to the hollow extension 33. In addition, a water passage 35 is preferably formed on the side surface of the hollow extension 33, the water passage 35 having a wide entrance water 35 a and an exit 35 b communicating with the water flow direction of the first branch passage 7. In addition, a Hastelloy spring 36 for urging the check valve 32 to the closing side is disposed in the water passage 35.

With this structure, the Hastelloy spring 36 for biasing the check valve 32 is located in the first branch 7 and is disposed at a position where it is diluted or washed with raw water, so that the high concentration No chemical reaction occurs with sodium chlorite, and gasification of sodium hypochlorite is suppressed.

[0332] As described above, the second check valve 22 is used at the connection portion (the second mixing tank 24 in the figure) between the second supply path 20 to which hydrochloric acid is added and the second branch path 8, but the second check valve is used. Since the internal chemical liquid passage extends between the check valve of the valve 22 and the chemical liquid discharge port, when the operation is stopped, the flow of the second branch passage 8 stops, and the check valve of the second check valve 22 closes. If the state continues, the hydrochloric acid in the chemical passage penetrates into the stagnant water in the second branch passage 8, and the pH value decreases. When the operation is restarted, hydrochloric acid will be added to this water, so it will take some time before normal raw water is added with hydrochloric acid. In order to solve this problem, the second check valve 22 is configured as follows.

In other words, the second check valve 22 has a main check valve 40 urged by a spring 39 at the rear of the chemical solution passage 38 of the valve casing 37 having the chemical solution passage 38, and the second check valve 22 is provided inside the second branch passage 8. A small auxiliary check valve 42 urged by a spring 41 is also provided at the leading end of the chemical liquid passage. With this structure, the internal chemical passage 38 of the second check valve 22 is double-closed by the main check valve 40 at the rear and the auxiliary check valve 42 at the front end. It does not penetrate the raw water that has accumulated. In addition, the auxiliary check valve 42 need only be used to stop the permeation of the chemical solution in the chemical solution passage 38 downstream of the main check valve 40, so that it is small.

The first chemical liquid adding device 3 and the second chemical liquid adding device 4 are installed in side-by-side chambers 43 and 44 which are individually partitioned in the casing 5. This is because when the chambers 43 and 44 of the first chemical liquid adding device 3 and the second chemical liquid adding device 4 are vertically arranged vertically, the chemical liquid leaking from the upper chamber reacts with the chemical liquid in the lower chamber to generate chlorine gas. Because there is.

Although illustration is omitted, each of the chambers 43 and 44 is provided with a liquid leakage sensor for detecting a chemical liquid leak of each of the liquid chemical adding devices 3 or 4, and an alarm device activated by a detection signal of the liquid leakage sensor. May be provided.

[0366]

【effect】

 The sterilizing water production device of the present invention automatically adjusts the amount of chemical solution added so that hypochlorous acid sterilizing water with an appropriate pH value is obtained, and mixes well. Since the water stops, sterilized water having a predetermined sterilizing power can always be provided safely.

During operation shutdown, a check valve that prevents gasification of sodium hypochlorite was used, and a check valve that did not allow hydrochloric acid to permeate the accumulated raw water was used. The time required to return to normal is significantly reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a piping system and a control system of an apparatus for producing sterilized water according to an embodiment of the present invention.

FIG. 2 is a sectional view showing how the first check valve is mounted.

FIG. 3 is a sectional view showing the mounting of the second check valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disinfection water manufacturing apparatus 2 ... Water flow path 3 ... 1st chemical | medical solution addition apparatus 4 ... 2nd chemical | medical solution addition apparatus 5 ... Casing 6 ... Raw water pipe line 7 ... 1st branch path 8 ... 2nd branch path 9 ... Merge path 10 ... Electric open / close valve 11 ... Flow switch 12 ... Flow meter 13 ... Constant flow valve 14 ... pH meter 15 ... First chemical liquid tank 16 ... First supply path 17 ... First pump 18 ... First check valve 19 ... Second chemical liquid tank DESCRIPTION OF SYMBOLS 20 ... 2nd supply path 21 ... 2nd pump 22 ... 2nd check valve 23 ... 1st chemical liquid mixing tank 24 ... 2nd chemical liquid mixing tank 25 ... 3rd mixing tank 26 ... control part 27 ... input part 28 ... pH Display part 29 ... Alarm means 30 ... Valve casing 31 ... Internal chemical liquid passage 32 ... Check valve 33 ... Hollow extension part 34 ... Valve rod 35 ... Water passage 35a ... Inlet 35b ... Outlet 36 ... Hastelloy spring 37 ... Valve casing 38 ... Internal chemical passage 3 9: Spring 40: Main check valve 41: Spring 42: Auxiliary check valve 43, 44: Chamber

[Reference number] UMS001-003

Continued on the front page (51) Int.Cl. ⁷ Identification code FI C02F 1/66 522 C02F 1/66 522A 522F 530 530P

Claims (4)

[Utility model registration claims] 1. A water passage for branching a middle part of a pipe through which raw water flows into a first branch and a second branch, and discharging the water through a merging path where the two branches merge. An electric on-off valve provided in a passage; a flow meter provided in the water passage and detecting a flow rate of raw water flowing through the inside and outputting a signal; and a sodium hypochlorite or sodium chlorite as a main component. A first chemical liquid tank for storing one chemical liquid; and a first supply path connected to the first branch path with a first pump interposed. The chemical liquid in the first chemical liquid tank is supplied to the raw water in the first branch path. A first chemical liquid addition device to be added; a first check valve provided at a connection portion between the first supply passage and the first branch passage; and a first check valve provided at a first supply passage connection portion of the first branch passage or a downstream side thereof. (1) a chemical liquid mixing tank; a second chemical liquid tank containing a second chemical liquid containing hydrochloric acid or acetic acid as a main component; And a second supply passage communicates with the second branch passage and interposed, said chemical liquid second chemical liquid tank second
A second chemical liquid adding device for adding to the raw water of the branch; a second check valve provided at a connection between the second supply path and the second branch; a second supply path connection of the second branch or a downstream side thereof And a third mixing tank interposed in the merging flow path of the water flow path; and a pH value of the sterilizing water provided downstream of the third mixing tank in the merging flow path and flowing therethrough. To detect and output
An H meter; a control device that controls the first pump and the second pump based on a signal from the flow meter, and that closes the electric open / close valve based on a signal from the pH meter;
An apparatus for producing sterilized water, comprising: 2. A water passage system for branching the middle of a pipe through which raw water flows into a first branch passage and a second branch passage, and discharging the water through a merging passage where the two branch passages are joined. An electromagnetic opening / closing valve provided in the passage; a flow meter provided in the water passage and detecting a flow rate of the water passage and outputting a signal; and a first accommodating a first chemical solution containing hydrochloric acid or acetic acid as a main component. A chemical tank,
A first chemical liquid adding device, comprising: a first supply path interposed with a first branch path via a first pump, for adding a chemical liquid in a first chemical liquid tank to raw water in the first branch path; Supply channel and first
A first check valve provided at a connection of the branch; a first chemical liquid mixing tank interposed at the first supply path connection of the first branch or downstream thereof; sodium hypochlorite or sodium chlorite A second chemical liquid tank containing a second chemical liquid mainly composed of a second chemical liquid, and a second chemical liquid tank connected to the second branch passage through a second pump.
A second chemical liquid addition device that includes a supply path and adds a chemical liquid in a second chemical liquid tank to the raw water in the second branch path; and a second check valve provided at a connection between the second supply path and the second branch path. A second supply path connecting part of the second branch path or a second part interposed downstream thereof;
A chemical mixing tank; a third mixing tank interposed in the merged flow path of the water flow path; and a pH value of the sterilizing water which is provided downstream of the merged flow path in the third mixing tank and detects and outputs the pH value. a pH meter; and a control device that controls the first pump and the second pump based on a signal from the flow meter, and that closes the electric open / close valve based on a signal from the pH meter. The first check valve is provided with a hollow extension protruding into the first branch passage or the first chemical liquid mixing tank at a distal end portion of a valve casing provided with a check valve in the internal chemical liquid passage, and a valve of the check valve A rod is extended to the hollow extension, and a water passage for passing water of the first branch is formed on a side surface of the hollow extension. In the hollow extension, the non-return valve engages with the valve rod. Disinfection water production characterized in that a metal spring for biasing a valve is provided. Location. 3. The second check valve has a main check valve biased by a spring disposed at a rear portion of the internal chemical liquid passage in the casing, and a spring attached to a distal end of the chemical liquid passage facing the second branch passage. 3. The apparatus for producing sterilized water according to claim 1, wherein the apparatus is provided with an energized auxiliary check valve. 4. The first chemical liquid adding device and the first chemical liquid adding device,
The chambers are disposed in side-by-side chambers individually partitioned in a casing of the sterilizing water producing apparatus, and each chamber has a liquid leakage sensor for detecting a liquid leakage of each liquid addition apparatus and a detection signal of the liquid leakage sensor. The apparatus for producing sterilized water according to any one of claims 1 to 3, further comprising an alarm device that operates on the basis of: