JP2010115639A - Method and apparatus for adjusting ph - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce initial investment expense since it is well known that sterilization water consisting essentially of hypochlorous acid or chlorine dioxide has an immediate effect, a strong sterilizing property and low residual property but the sterilization water can be hardly produced and needs an expensive apparatus to require large investment expense. <P>SOLUTION: In the method and the apparatus, apparatus structure can be simplified to reduce cost by using a method for stably adjusting the pH of produced sterilization water by utilizing coherency of carbon dioxide. Further a conventional method and a conventional apparatus for injecting a fungicide can be used as it is by adjusting only the pH of raw water. Moreover, the structure of an apparatus, which can be installed even in an atmosphere getting a wetting and having corrosiveness, is also provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method and apparatus for adjusting pH (pH) to weak acidity by mixing carbon dioxide with well water, tap water or seawater. Moreover, it is related with the production | generation method and apparatus of the sterilization water which has hypochlorous acid or chlorous acid as a main component.

  The present invention relates to a method and apparatus for producing weakly acid diluted sterilized water by mixing water, tap water or seawater with carbon dioxide and sodium hypochlorite or sodium chlorite (hereinafter referred to as a bactericidal agent).

  The present invention relates to a method and a technique for generating raw water or diluted sterilized water having a substantially constant chlorine concentration and pH value even when there is a change in the discharge flow rate of the raw water or diluted water obtained by mixing the raw water with a sterilizing agent.

  At present, it is widely known that hypochlorous acid or sterilized water containing chlorous acid as a main component is almost harmless to the human body and has an excellent sterilizing effect. For example, hypochlorous acid is contained in a sodium hypochlorite aqueous solution in which sodium hypochlorite is diluted with water to have a free chlorine concentration of about 200 ppm and a pH value of about 8.6. It has been known for a long time that the ratio of hypochlorous acid increases by lowering the pH value to make it a weak acid and the pH value becomes almost 100% in the vicinity of 5.

  As an example of a method of producing sterilizing water mainly composed of hypochlorous acid or chlorous acid, a method of mixing an aqueous solution of sodium hypochlorite or an aqueous solution of sodium chlorite with an acidic aqueous solution such as hydrochloric acid is known. Yes.

  As another example of a method for producing sterilizing water containing hypochlorous acid as a main component, a method of directly electrolyzing a hydrochloric acid aqueous solution is known. Furthermore, a method of generating a hypochlorous acid aqueous solution on the positive electrode side by injecting a sodium chloride aqueous solution into a diaphragm electrolytic cell having a diaphragm between the positive electrode and the negative electrode and electrolyzing it, A method of directly electrolyzing a mixed aqueous solution of sodium chloride to produce it is also known.

  In addition, as a method of using the sterilizing water produced by the above method, it is produced by mixing a sodium hypochlorite aqueous solution and an acidic aqueous solution with a dedicated device, or producing sterilized water with a dedicated electrolyzer, In general, the sterilizing water discharged from the apparatus is taken out from a stop valve or a faucet and used.

Problems to be solved by the invention

  The method of producing sterilized water by mixing sodium hypochlorite aqueous solution or sodium chlorite aqueous solution with acidic aqueous solution has the advantage that sterilized water can be easily produced, but it is difficult to control the amount of acidic aqueous solution to be mixed. When the amount of the acidic aqueous solution is as large as possible, the pH value is suddenly lowered to enter the gasification region, and there is a problem that chlorine gas or chlorine dioxide gas which is poisonous gas is generated.

  Because of these problems, disinfectants and bleaching agents containing sodium hypochlorite that are generally available on the market are marked with a caution that prohibits their use with acids. Therefore, this method requires precise chemical solution addition control.

  In addition, a method of directly electrolyzing a hydrochloric acid aqueous solution or a sodium chloride aqueous solution injected into a diaphragm membrane electrolytic cell having a diaphragm between the positive electrode and the negative electrode and electrolyzing the solution, a hypochlorous acid aqueous solution on the positive electrode side In the method of generating water and the method of directly electrolyzing a mixed aqueous solution of hydrochloric acid and sodium chloride, and generating it at a pH value of about 5 where the content ratio of hypochlorous acid is the highest, subtle adjustments can be made. Actually, the actual condition is that the pH value is set to about 7 and the electrolysis conditions are controlled with a certain range.

  On the other hand, as a method of using the sterilized water generated by the above method, a sodium hypochlorite aqueous solution and an acidic aqueous solution are mixed by a dedicated device, or sterilized water is generated by a dedicated electrolyzer, In order to take out a desired amount of sterilized water discharged from the apparatus, it is common to take it out through a flow rate adjusting valve, a stop valve, or a faucet.

  In that case, the amount of sterilizing water discharged from the device may fluctuate constantly, become extremely small, or even be stopped. There is a problem that the concentration and pH value of the generated sterilizing water become unstable. Therefore, it is necessary to provide a water storage tank such as an accumulator for storing the generated sterilized water, which causes a problem in terms of cost and equipment.

  In addition, each method requires delicate adjustments that make full use of electric control, and is not suitable for environments where condensation occurs at high temperature and high humidity, or where water is splashed. Costs such as making the entire device a sealed structure.

Means for solving the problem

  Even if the amount of water discharged from the apparatus or the amount of sterilizing water changes, the present invention adjusts the pH value and chlorine concentration by automatically adjusting the addition amount of carbon dioxide gas and sterilizing agent according to the amount of water. Proposed method.

  Specifically, the pH value is adjusted by adjusting the amount of carbon dioxide injected according to the flow rate, and the chlorine concentration is adjusted by adjusting the amount of bactericidal agent added according to the flow rate. It is a thing to do by.

  Here, the carbon dioxide gas has interference at pH 5 to 6 which is highly effective as sterilizing water, and unlike the hydrochloric acid mixing described above, the pH does not fluctuate greatly due to a slight change in the mixing amount. Even if the flow rate of carbon dioxide gas is adjusted step by step and the flow rate of carbon dioxide gas is changed step by step by changing the combination of solenoid valves to open and close according to the flow rate change of raw water, the pH value fluctuation is extremely Less.

  That is, it is sufficient to change the flow rate of carbon dioxide gas stepwise instead of continuously changing the flow rate of carbon dioxide gas according to the flow rate of discharged water. Thereby, the objective can be sufficiently achieved by using a plurality of inexpensive electromagnetic switches and controlling the flow rate of the carbon dioxide gas mixed into the raw water by the combination without using an expensive variable flow rate regulator.

  More specifically, the amount of carbon dioxide gas to be injected is provided with a plurality of electromagnetic switches for opening and closing the carbon dioxide supply line, and the amount of carbon dioxide flowing when each electromagnetic switch is opened is set in advance at the electromagnetic switch outlet. It is set by a fixed flow rate adjuster provided, and the flow rate of the discharged water is detected by a flow rate sensor, and the electromagnetic switch is adjusted by opening and closing with a preset combination with respect to the flow rate.

  Similarly, since a predetermined amount of the sterilizing agent is mixed according to the water discharge flow rate detected by the sensor, the sterilizing water discharged from the faucet or the manual valve located downstream or upstream of the apparatus is discharged. Even if the amount of water is adjusted, sterilized water having a constant chlorine concentration and pH can always be obtained.

  The injected carbon dioxide gas or disinfectant has at least two plates with at least one hole in the static mixer or pipe, and the holes are opened at different positions on adjacent plates. The raw water into which gas, sodium hypochlorite or sodium chlorite has been injected flows through the hole and is mixed efficiently by a mixing line or the like in which a stirring action occurs.

  Furthermore, when the amount of discharged water is reduced to an extremely small value by a stop valve or the like, the sales expansion effect is difficult to occur, and the injected carbon dioxide gas and the sterilizing agent may not be sufficiently mixed with the raw water. For this purpose, a branch pipe is provided upstream of the flow sensor provided in the water discharge pipe. If the amount of water detected by the flow sensor is less than a preset value, the electromagnetic switch provided in the branch pipe is opened. Part of the acid water or sterilizing water generated through the branch pipe may be drained to the drain pipe, and the flow rate flowing through the mixing pipe may be kept above a certain flow rate. If the flow rate detected by the flow rate sensor is less than a certain value, the solenoid valve of the branch pipe may be opened to drain a certain amount of acidic water or sterilized water.

  At that time, if the flow rate drained from the branch pipe is increased too much, waste will increase, so the amount of water drained from the branch pipe should be adjusted to a level where the flow rate flowing through the mixing pipeline is kept to a minimum. Is desirable.

  In addition, using a device that mixes only carbon dioxide gas with raw water and adjusts the pH value of the raw water to weak acidity, sterilization of sodium hypochlorite and the like is performed on the weakly adjusted water using conventional methods. By introducing the agent, hypochlorous acid having a strong sterilizing power can be generated, and the capital investment cost can be kept low, and the conventionally used sterilizing agent injection method and apparatus can be used as they are.

  FIG. 1 shows an exemplary embodiment of the present invention. Carbon dioxide gas is contained in the carbon dioxide gas cylinder 1, and the carbon dioxide gas is depressurized to a pressure set by the pressure regulator 2 from the cylinder 1, passes through the three electromagnetic switches 4, 5, 6, and further, the flow rate regulator 7, 8 and 9 are sent to the carbon dioxide injection section 10.

  The raw water passes through the electromagnetic switch 11 provided in the water supply pipe 18, carbon dioxide is injected by the carbon dioxide injection section 10, is sent to the mixing pipe 12, and is further sent to the water discharge pipe 13. Then, the water is discharged through the faucet 16 through the flow rate sensor 14 provided in the water discharge line 13.

  Here, the flow rate regulators 7, 8, and 9 adjust the flow rate of carbon dioxide gas that flows when the electromagnetic switches 4, 5, and 6 are opened in advance, respectively. According to the flow rate detected in step 1, the combination is opened and closed in a preset manner.

  Next, the operation will be described. When an operation button (not shown) of the apparatus is pressed, the electromagnetic switch 11 is opened and raw water can be supplied. Therefore, when the faucet 16 at the tip of the water discharge pipe 13 is opened, the supplied raw water is discharged through the water supply pipe 18, the mixing pipe 12, the water discharge pipe 13, the flow sensor 14, and the faucet 16.

  As a result, the flow sensor 14 detects the flow rate, and opens and closes the electromagnetic switches 4, 5, 6 in a preset combination according to the flow rate. Of course, when the flow rate changes, the open / close pattern of the electromagnetic switches 4, 5, 6 changes according to the flow rate.

  Therefore, the amount of carbon dioxide gas suitable for the flow rate detected by the flow rate sensor 14 is injected into the raw water from the carbon dioxide injection unit 10, and is sufficiently mixed with the raw water in the mixing pipe 12 and dissolved in the raw water. Thereby, the pH value of raw | natural water is adjusted.

  Here, as described above, in the range of about 5 to 6, the carbon dioxide gas has an interference property that the pH value does not fluctuate greatly even if the ratio of the carbon dioxide gas mixed in the raw water is slightly different. Therefore, even if the number of electromagnetic switches for selecting the flow rate of carbon dioxide gas is not so large, the pH value can be kept substantially constant.

  Next, FIG. 2 shows an embodiment in which a drain pipe is provided. When the flow rate detected by the flow rate sensor 14 is smaller than the preset flow rate, the electromagnetic switch 15 provided in the drainage pipe 17 is opened and a part of the water flowing through the water discharge pipe 13 is from the drainage pipe 17. Drained. At that time, it is adjusted by a flow rate regulator or the like so that the amount of drainage flowing through the drainage pipe becomes substantially constant.

  As a result, even when the faucet is only slightly open, the flow rate flowing through the mixing pipe 12 flows by the sum of the flow rate flowing through the faucet and the flow rate drained from the drain pipe so that sufficient mixing performance can be exhibited. It has become.

  And in the state which the electromagnetic switch 15 provided in the drain pipe 17 opened, according to the flow volume which the flow sensor detected, the electromagnetic switches 4, 5, and 6 operate | move by another preset opening / closing pattern. It is made to do. That is, the electromagnetic switches 4, 5, and 6 operate in a pattern different from the case where the electromagnetic switch 15 is closed (a pattern that takes into account the flow rate flowing through the drain pipe).

  When the faucet 16 is completely closed, the flow rate detected by the flow rate sensor 14 becomes zero. When the flow rate detected by the flow sensor 14 becomes zero, all of the electromagnetic switches 4, 5 and 6 supplying the carbon dioxide gas are closed, the carbon dioxide gas supply is stopped, and the drainage pipe 17 is provided. The electromagnetic switch 15 is also closed to stop draining.

When the pressure switch 3 for detecting the pressure of carbon dioxide gas detects a pressure lower than a preset pressure, the electromagnetic switch 11 provided in the water supply line 18 is closed and all the electromagnetic switches are closed. A buzzer (not shown) warns of an abnormality.
As a result, raw water whose pH value is not adjusted in a state in which carbon dioxide is exhausted is prevented from being sent to the water discharge pipe 13.

  Further, FIG. 3 is an example in which a drain pipe 17 and an electromagnetic switch 15 are provided in another place of FIG. In this case, since the drain pipe is provided downstream of the flow rate sensor, the control pattern of the electromagnetic switches 4, 5, 6 is always controlled by the flow rate detected by the flow rate sensor. However, in this case, even if the faucet 16 is completely closed, a certain amount of water is discharged from the drain pipe, which is not economically preferable.

  Next, FIG. 4 shows another representative embodiment of the present invention. This is because a sodium hypochlorite addition part 19 is provided in front of the mixing pipe 12 and a backflow prevention valve 43 is provided between the carbon dioxide injection part 10 and the addition part 19. In this example, a bactericide (sodium hypochlorite) is also added. Here, the disinfectant may be sodium chlorite instead of sodium hypochlorite.

  If the faucet 16 is left closed for a long time, the sodium hypochlorite added in the sodium hypochlorite addition part 19 diffuses into the pipe and spreads upstream of the addition part 19. If high-concentration carbon dioxide and sodium hypochlorite aqueous solution are in contact with each other for a long time, sodium carbonate is generated and precipitates in the carbon dioxide injection part, causing clogging. The backflow prevention valve 43 is shut off so that the sodium chlorate aqueous solution does not come into contact.

  Therefore, it is important that the sodium hypochlorite addition part 19 is always installed downstream of the carbon dioxide injection part 10, and separating it with the backflow prevention valve 43 or the like is to prevent failure of the apparatus. It is important.

  The disinfectant stored in the tank 20 is sent from the tank 20 to the adding unit 19 by the electromagnetic metering pump 22. The amount to be sent is programmed to send a predetermined amount according to the flow rate detected by the flow sensor 14. However, when the electromagnetic switch 15 provided in the drain pipe 17 is open, the sterilizing agent is sent by the electromagnetic metering pump 22 to the flow rate obtained by adding a predetermined flow rate to the flow rate detected by the flow rate sensor. And added to raw water.

  The tank 20 is provided with a sensor 21 for detecting the liquid level of the bactericide. When this sensor 21 does not detect the liquid level of the bactericide, the electromagnetic switch 11 provided in the raw water supply pipe 18 is closed, all the electromagnetic switches are closed, and the electromagnetic metering pump is stopped and the buzzer ( (Not shown) is used to warn of abnormalities.

  Thereby, it is preventing that the water to which the disinfectant is not added is sent to the water discharge pipe. Instead of the sensor 21, a non-contact sensor for detecting the presence or absence of a sterilizing agent may be provided between the tank 20 and the pump 22.

  Similarly to FIGS. 2 and 3, the water discharge line 17 and the electromagnetic switch 15 may be provided in the water discharge line of FIG. 4. When the drain pipe is provided upstream of the flow sensor, when the electromagnetic switch 15 provided in the drain pipe 17 is open, as described in FIG. 2, the electromagnetic switch 15 is closed. The electromagnetic switches 4, 5 and 6 are operated in a different opening / closing pattern, and the amount of sterilizing agent fed by the electromagnetic metering pump 22 for sending the sterilizing agent is also added to the flow rate detected by the flow sensor 14 in advance. It is sent according to the flow rate.

Next, another embodiment of the present invention will be described with reference to FIG.
This is another example of the embodiment in which carbon dioxide gas and a bactericidal agent are injected into the raw water shown in FIG. 4, and a stirring tank 23 is provided downstream of the mixing pipe 12.

  The details of the stirring tank will be described with reference to FIG. The water passing through the mixing line 12 passes through the nozzle 24 inserted into the stirring tank 23 from approximately the center of the stirring tank 23, and enters the bottom of the stirring tank 23 from the opening 25 opened on the lower side of the nozzle 24. Water is sent towards. The fed water is discharged from an outlet provided in the upper part of the stirring tank and sent to the water discharge pipe.

  The water sent to the agitation tank 23 once flows downward in the agitation tank 23, then flows upward and exits from the upper outlet of the agitation tank 23. At this time, the fed water and the water flowing from the bottom of the stirring tank 23 toward the top collide with each other and are stirred.

  The mixing pipe 12 may be a static mixer, or may be one in which at least two baffle plates 27 and 28 having at least one hole are provided in the pipe 26 as shown in FIG. good. At that time, the holes formed in the baffle plates 27 and 28 are arranged so that the positions of the respective holes are farthest between the baffle plates adjacent to each other.

  As a result, the water flowing in the mixing pipe 12 flows while drawing complicated streamlines in the mixing pipe 12, as shown in FIG. 7, and efficiently mixes with the injected carbon dioxide and the sterilizing agent. Here, as shown in FIG. 8, the baffle plates 27 and 28 have a hole at a position off the center, one has a hole at the center, and the other has one or two at a position off the center. Use one with holes. Of course, the number of holes may be more than one.

  Next, FIG. 9 shows another embodiment of the present invention. In this embodiment, the agitation tank 29 is a simple tank and only enters from the bottom of the agitation tank 29 and exits from the top. Even with such a simple structure, if the capacity of the stirring tank is large, it can function sufficiently. Here, the flow direction may be not only from the bottom to the top but also from the top to the bottom.

  Next, FIG. 10 shows still another embodiment of the present invention. In this, the agitation tank 23 is provided between the sterilizing agent addition part 19 and the mixing pipe 12, and the sterilizing agent and carbon dioxide gas are premixed in the agitation tank 23. Here, the stirring tank 23 may be a stirring tank 29 which is a simple tank as shown in FIG.

  Further, the arrangement of all the agitation tanks 23 and 29 described above is not in the vertical direction, and the agitation tanks 23 and 29 may be laid sideways. However, in order to prevent undissolved carbon dioxide from accumulating in the agitation tank, The direction is desirable.

  Here, the detail of the addition part 19 of a disinfectant is shown in FIG. The disinfectant sent from the electromagnetic metering pump 22 pushes the ball 36 through the conduit 39 and enters the storage unit 37. When the sterilizing agent is sent by the electromagnetic pump 22 or the like, the sterilizing agent is intermittently sent. Therefore, after the sterilizing agent once pushes the ball 36 open and enters the storage portion, the ball 36 is pushed down by the spring 38 and the pipe line Block the 39 exit.

  On the other hand, the raw water passes through the pipe 42 and enters the pipe 41. At that time, a part of the raw water enters and leaves the storage portion 37 through the hole 40 and flows into the pipe 41 while being mixed with the disinfectant. Thereby, the disinfectant density | concentration of the storage part 37 becomes thin gradually. Then, when the sterilizing agent is sent next time, the thin sterilizing agent previously stored in the storage unit 37 is pushed out and flows.

  Thereby, even if supply of a disinfectant is intermittent, a disinfectant is mixed with raw water comparatively equally and flows. And it is averaged, so that the volume of the storage part 37 is large.

  Here, the ball 36 serves as a lid so that the stock solution of the bactericide accumulated in the pipe 39 of the adding unit 19 does not slowly mix with the water in the pipe. Without this lid, if the apparatus faucet 16 is closed for a long time, the concentration of the sterilizing agent in the conduit 39 will be thin. Next, when the faucet 16 is opened, sterilizing water having a low chlorine concentration is discharged for a while, and the concentration stability of the discharged sterilizing water cannot be ensured.

  In addition, although not shown in the drawings, a main backflow prevention valve is often installed upstream of the pipeline 39, and the portion may have an enlarged portion of the pipeline. And since sodium hypochlorite is easy to vaporize, when bubbles are generated by vaporizing in the pipe line sent from the pump 22 when water discharge is stopped for a long time, these bubbles are combined and become large.

  If the addition part 19 is installed vertically downward or sideways, bubbles that are combined and enlarged may accumulate in the pipe expansion part. Since the accumulated bubbles are gas and have compressibility, even if a fixed amount of liquid is sent out by the pump 22, the added amount is larger than the volume that is compressed by the back pressure of the pipes 41 and 42 and pushed out by the pump 22. May be slightly less. Thereby, the chlorine concentration of produced | generated sterilization water may become thin. Therefore, it is optimal to install the addition unit 19 vertically upward.

  In the above-described embodiment, the number of the flow sensors 14 is one, but the flow sensors 14 may be provided upstream and downstream of the branch portion of the drain pipe 17. In this case, the switching patterns of the electromagnetic switches 4, 5 and 6 and the control of the electromagnetic metering pump 22 are all performed according to the value detected by the flow sensor installed upstream from the branching section and downstream from the branching section. When the flow rate detected by the flow sensor at 0 is zero, all the electromagnetic switches 4, 5, 6 are closed and the electromagnetic metering pump 22 is also stopped.

  In the above-described embodiment, the faucet 16 may be a manual valve or an electromagnetic opening / closing valve. The electromagnetic metering pump 22 may be a tube pump that crushes the tube with a roller and sends a sterilizing agent.

  Three electromagnetic switches 4, 5, and 6 are used in the embodiment, but two or four or more electromagnetic switches may be used. The carbon dioxide gas is supplied from the cylinder 1, but a mini cartridge may be used. Further, the electromagnetic switch 11 provided in the water supply pipe 18 may not be provided.

  Next, FIGS. 11 and 12 show image diagrams of the embodiment of the present invention shown in FIG. The electrical part 30 and the pipe line part 31 are completely separated, a waterproof sheet 35 is attached to the side surface of the electrical part 30 and the back side of the top plate 32, and the electrical part is attached by attaching the top plate 32 and the side cover 34. The interior is completely isolated from the exterior. Further, the front plate 33 is a decorative cover for fixing the electrical component 30 and the conduit portion 31 integrally and improving the appearance.

  With this structure, it is possible to easily seal only the electrical component 30 that is not susceptible to water and condensation without making the entire device sealed, and furthermore, the electrical component can be opened simply by removing the top plate 32 and the cover 34. Is easy. In addition, it is possible to easily replace only the electrical unit 30.

  In FIG. 12, two mixing pipes 12 are provided, the pipe branches into two before the mixing pipe 12, and merges after the mixing pipe 12. This is because if the mixing pipe 12 is made too thick, the mixing efficiency deteriorates at a low flow rate, so that the mixing efficiency is improved while increasing the maximum flow rate. Of course, the number of the mixing conduits 12 may be one, or three or more.

  Moreover, the material used for the pipe line part 31 is stainless steel or resin. Thereby, it is also possible to install in a place where water is splashed or in a corrosive atmosphere.

The invention's effect

  By carrying out the present invention, alkaline sodium hypochlorite aqueous solution or sodium chlorite aqueous solution is used to adjust sterilized water or chlorine dioxide mainly composed of weakly acidic hypochlorous acid by adjusting the pH of carbon dioxide gas. It becomes sterilizing water having a main component, and the sterilizing effect can be dramatically increased without adding an acidic aqueous solution.

  Furthermore, since the electric control unit is isolated from the outside, it is possible to create a device that does not require any maintenance because it does not select the installation environment of the device, and there are few failures.

  And since the pH interference property of carbon dioxide gas is used, when the amount of water increases, the pH can be stabilized by simple control of increasing the injection amount of carbon dioxide gas stepwise (stepwise), An inexpensive and simple device can be realized.

  In addition, the chlorine concentration and pH can be kept constant without being affected by the amount of sterilizing water discharged, and by stopping the sterilizing water discharge, sodium hypochlorite and sodium chlorite The supply of carbon dioxide gas can be automatically stopped completely, and an easy-to-use and safe device can be realized.

  The method and apparatus proposed in the present invention does not require complicated control and has a simple structure, so that the price of the apparatus can be reduced. In addition, when measuring and putting a bactericidal agent into water with a measuring cup, or when having a diluting and mixing device that contains only a bactericidal agent, a conventional device that mixes only carbon dioxide with raw water is used. Without changing the method and apparatus, hypochlorous acid having strong sterilizing power or sterilizing water mainly composed of chlorous acid can be generated, and the cost burden is reduced.

Shown is a representative embodiment of the present invention. FIG. 1 shows an embodiment in which a drain pipe is provided. FIG. 1 shows another embodiment in which a drain pipe is provided. Figure 2 shows another exemplary embodiment of the present invention. Figure 3 shows another embodiment of the present invention. Show details of agitation tank Show details of mixing line Show details of baffle plates Figure 3 shows another embodiment of the present invention. Figure 3 shows another embodiment of the present invention. The image figure of the Example of this invention is shown The image figure of the Example of this invention is shown The detail of the fungicide addition part of this invention is shown.

DESCRIPTION OF SYMBOLS 1 Carbon dioxide gas cylinder, 2 Pressure regulator, 3 Pressure switch 4, 5, 6 Electromagnetic switch, 7, 8, 9 Flow regulator 10 Carbon dioxide injection part 11 Electromagnetic switch, 12 Mixing line 13 Water discharge line, 14 Flow rate Sensor 15 Electromagnetic switch 16 Faucet, 17 Drainage pipe, 18 Supply pipe 19 Addition part, 20 Tank, 21 Sensor 22 Electromagnetic metering pump, 23 Stirring tank, 24 Nozzle 25 Opening part, 26 Case, 27, 28 Baffle plate 29 Stirring tank, 30 electrical equipment section, 31 pipeline section, 32 top plate 33 front plate, 34 side cover, 35 waterproof sheet, 36 ball, 37 storage section, 38 spring, 39 pipeline 40 hole, 41, 42 pipeline, 43 reverse flow Prevention valve

Claims (18)

In a method of adjusting well water, tap water or seawater (hereinafter referred to as raw water) to weak acidity, at least two electromagnetic switches are used, and the amount of carbon dioxide flowing when each electromagnetic switch is opened is set in advance. The flow rate of carbon dioxide injected into the raw water is controlled by changing the combination of opening the electromagnetic switch according to the flow rate of the raw water, and the ratio of carbon dioxide gas mixed into the raw water is always changed even if the flow rate of the raw water changes. Raw water pH adjustment method, characterized by maintaining almost constant After injecting carbon dioxide into the raw water, there are a plurality of plates with at least one or more holes in the static mixer or pipe, and the holes are opened at different positions on adjacent plates. 2. The pH adjustment method according to claim 1, wherein the injected carbon dioxide gas is efficiently dissolved in the raw water by a mixing line or the like in which a stirring action occurs when the injected raw water flows through the hole. When discharging the raw water into which the carbon dioxide gas has been injected, the water discharge flow rate can be adjusted or stopped completely by a stop valve such as a faucet at the tip of the water discharge pipe, and the water discharge is completely stopped. 3. The pH adjustment method according to claim 1, wherein all of the electromagnetic switches for supplying carbon dioxide are closed to block carbon dioxide injection. When adjusting the water discharge amount of the raw water into which the carbon dioxide gas has been injected by a stop valve such as the faucet, when the water discharge amount is smaller than a preset flow rate, a branch pipe downstream of the mixing pipe such as the static mixer In addition to the water discharged from the faucet or the like, it has a bypass pipe for draining the raw water mixed with carbon dioxide gas, thereby maintaining the flow rate of the raw water flowing through the mixing pipe above a certain amount of water. The pH adjustment method according to claim 1 to 3 5. The pH adjustment method according to claim 1, wherein when the supply pressure of carbon dioxide gas becomes equal to or lower than a set pressure, the supply of raw water and carbon dioxide gas is cut off by an electromagnetic switch or the like. 7. The pH adjustment method according to claim 1, wherein sodium hypochlorite or sodium chlorite is added to the raw water after the carbon dioxide gas is injected. After adding the sodium hypochlorite or sodium chlorite, it further has a mixing part such as a tank separately from the mixing pipe, and efficiently adds the added sodium chlorite or sodium chlorite. The pH adjustment method according to claim 1, wherein the pH adjustment method is mixed with raw water. A sensor is provided in the pipe for supplying sodium hypochlorite or sodium chlorite, or in a tank for storing sodium hypochlorite or sodium chlorite, and sodium hypochlorite or sodium chlorite. 8. The pH adjustment method according to claim 1, wherein the supply of raw water and carbon dioxide gas is cut off by an electromagnetic switch or the like after detecting that there is no more water. Pressure that adjusts the supply pressure of carbon dioxide gas, including supply pipes that supply well water, tap water, or seawater, a flow sensor that detects the flow rate of raw water, and carbon dioxide supply means such as a carbon dioxide cylinder It has a regulator, has at least two electromagnetic switches that open and close the carbon dioxide supply line, has a carbon dioxide injection part that injects carbon dioxide into the raw water, and converts the injected carbon dioxide into the raw water There are a plurality of plates with at least one or more holes in the static mixer or pipe line to be mixed, and the holes are opened at different positions in the adjacent plates, and the raw water into which carbon dioxide gas has been injected passes through the holes. A pH adjusting device having a mixing line that causes a stirring action when flowing through and having a water discharge line that discharges raw water mixed with carbon dioxide gas The pH adjusting device according to claim 9, further comprising a manual valve such as a faucet or an electromagnetic switch at a tip of the water discharge pipe. The pH adjusting device according to claim 9 or 10, wherein the water discharge pipe has a branch pipe, and the branch pipe has an electromagnetic switch. The pH adjustment method according to claim 9, wherein the raw water supply pipe has an electromagnetic switch. It has a supply device such as a pump for supplying sodium hypochlorite or sodium chlorite, has a backflow prevention valve downstream of the carbon dioxide injection section, and is sent from the supply device downstream of the backflow prevention valve. 13. A pH adjusting device according to claim 9, further comprising an addition section for adding sodium hypochlorite or sodium chlorite. 14. A pH adjusting device according to claim 9, further comprising a tank between a downstream portion of the sodium hypochlorite or sodium chlorite addition section and the water discharge pipe. A water supply conduit to the tank is connected at a substantially central position in the longitudinal direction of the tank at a right angle to the longitudinal direction of the tank, and has an outlet from the tank at one end in the longitudinal direction of the tank. 15. The water pipe according to claim 9, further comprising a pipe projecting into the tank at a tip of the water pipe, and a hole in a side opposite to the outlet of the tank. PH adjustment method The sodium hypochlorite or sodium chlorite addition portion has a space where a small amount of sodium hypochlorite or sodium chlorite can be stored at the tip of the addition portion, and the supplied sodium hypochlorite or sodium chlorite. The pH adjusting device according to any one of claims 9 to 15, wherein the sodium chlorate has a structure in which not all sodium chlorate is added to raw water at once but gradually added. The pH adjusting device according to claim 9, wherein the sodium hypochlorite or sodium chlorite addition portion is installed vertically upward. The control section of the apparatus and the pipe section through which the raw water flows are incorporated in one apparatus, and the control section is structured to prevent water and the like from entering from the outside by a waterproof seal or the like. Item 18. The pH adjusting device according to item 10 to 17.

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