JP2005161142A - Apparatus for producing sterilizing water continuously - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To continuously produce slightly-acidic sodium hypochlorite-diluted water (sterilizing water) having desired sterilizing power over a long period of time without maintaining a sterilizing water producing apparatus. <P>SOLUTION: Sterilizing water is produced by arranging a mixing/reacting part for producing sterilizing water on the downstream side of a diluting/mixing part for producing a dilute acid aqueous solution, injecting a sodium hypochlorite aqueous solution (an undiluted liquid) into the dilute acid aqueous solution while making the dilute acid aqueous solution flow in the mixing/reacting part and mixing the sodium hypochlorite aqueous solution with the dilute acid aqueous solution. This apparatus can be provided with an air bubble removing unit for removing air bubbles suspended in the sodium hypochlorite aqueous solution or an agitation tank accumulator for homogenizing the sterilizing water produced in the mixing/reacting part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a continuous production apparatus for sterilizing water composed of diluted water of a sodium hypochlorite aqueous solution whose pH value is kept in a weakly acidic range by adding an aqueous acid solution such as hydrochloric acid or acetic acid.

  In medical facilities and the food industry, sodium hypochlorite diluted water formed by diluting a sodium hypochlorite aqueous solution (stock solution) to a certain concentration with tap water or the like is widely used as sterilizing water. And it is known that the disinfection power of this sodium hypochlorite-diluted water is greatly enhanced by maintaining the pH in a weakly acidic region.

  Diluted water of sodium hypochlorite that maintains such a pH in a weakly acidic region is generally diluted with hydrochloric acid and water to form dilute hydrochloric acid, and mixed with sodium hypochlorite aqueous solution (stock solution) and water. It is obtained by producing a sodium hypochlorite aqueous solution and mixing these dilute hydrochloric acid and diluted sodium hypochlorite aqueous solution.

And many sterilization water production | generation apparatuses for producing | generating such sodium hypochlorite dilution water are proposed by the patent document and the nonpatent literature.
JP 2002-241209 A JP 2001-321778 A JP-A-11-188083 Norihito Tanbo and Junichi Ogasawara "Water Purification Technology" (Gihodo Publishing)

  The problem to be solved by the present invention is that the tap water or the well water is injected with the sodium hypochlorite aqueous solution (stock solution) by the alkaline component contained in the sodium hypochlorite aqueous solution (stock solution). Calcium and magnesium components contained in the well water are deposited, which adheres to the backflow prevention valve of the injection section and makes the movement of the backflow prevention valve worse, or narrows the injection port of the injection section to obtain a desired amount of hypochlorous acid. The sodium acid aqueous solution (stock solution) is not injected, and the sterilizing power of the generated sterilizing water is reduced.

  The main feature of the present invention is that it includes a device for adding a sodium hypochlorite aqueous solution (stock solution) to a dilute acid aqueous solution produced by dilution and mixing in advance.

  In the continuous production apparatus for sterilizing water according to the present invention, the scale component such as calcium contained in the source water does not precipitate and adhere to the vicinity of the injection port for injecting the sodium hypochlorite aqueous solution (stock solution). An aqueous solution of sodium chlorite (stock solution) can always be injected, and the chlorine concentration in the produced sterilized water always becomes a desired value, so that there is an advantage that sterilized water having the desired sterilizing ability can be surely obtained.

  Moreover, the continuous production | generation apparatus of the sterilization water which concerns on this invention can respond even if it is a case where the sodium hypochlorite aqueous solution (raw solution) has deteriorated, when the said supply amount correction | amendment part is provided, and is produced | generated. There is an advantage that the chlorine concentration in the sterilized water becomes a desired value, and thus sterilized water having the desired sterilizing ability can be surely obtained.

  Moreover, when the continuous production | generation apparatus of the sterilization water which concerns on this invention is equipped with the said bubble removal apparatus, the idling of the pump of the sodium hypochlorite aqueous solution supply means is prevented, and desired amount of sodium hypochlorite aqueous solution ( The chlorine concentration in the produced sterilized water always becomes a desired value, and therefore, there is an advantage that sterilized water having the desired sterilizing ability can be surely obtained.

  Further, when the sterilizing water continuous generation apparatus according to the present invention includes a stirring tank accumulator that retains the sterilizing water generated in the mixing reaction section, the pressure of water supplied from the water source changes and the sterilization Even if the chlorine concentration or pH of the water changes somewhat, the chlorine concentration or pH of the sterilizing water is homogenized by the stirring tank accumulator, so that there is an advantage that sterilizing water having a stable chlorine concentration and pH can be supplied.

  Moreover, the continuous production | generation apparatus of the sterilizing water which concerns on this invention has the advantage that an apparatus can be reduced in size, when the said mixing dilution part and the said mixing reaction part are made into a common mixing container.

  The objective of continuously obtaining sterilized water having a desired sterilizing ability over a long period without maintenance of the apparatus was realized with a simple apparatus configuration.

  1 is an explanatory view of an embodiment of the apparatus of the present invention, FIG. 2 is an explanatory view of a dilution column of an embodiment of the apparatus of the present invention, FIG. 3 is an explanatory view of a bubble removing apparatus of an embodiment of the apparatus of the present invention, FIG. 4 is an explanatory view of a mixing column of an embodiment of the apparatus of the present invention, and FIG. 5 is a rear view of the diffusion portion of FIG.

  In FIG. 1, reference numeral 10 denotes a water source, and water (source water) is supplied from the water source 10 to the acid dilution column 14 via the source water pipe 12. A public water supply or well is used as the water source 10, but when the water source 10 is a well, the pumped water needs to be adapted as drinking water.

  The source water pipe 12 is provided with a cistern 16, a pressure reducing valve 18, a filter 20, a solenoid valve 22, a flow rate sensor 24, and a liquidity detection sensor 26 in this order from the side closer to the water source 10. Is provided with a check valve 28 and a check 30.

  Here, the cistern 16 is installed in order to compensate for the shortage of the amount of water supplied from the water source 10 and the pressure. The pressure reducing valve 18 is installed to lower the pressure of the water supplied from the water source 10, protect the filter 20 and the electromagnetic valve 22, and stabilize the discharge amount of pumps 38 and 58 described later.

  The filter 20 is installed to protect the source water pipe 12 and various pipes 44, 66, and 72 described later, stabilize the pH of water supplied from the water source, and remove dust in the water. ing. The electromagnetic valve 22 is installed in order to stop the supply of water from the water source in the event of an abnormality in the apparatus.

  The flow rate sensor 24 is installed to measure the flow rate of water flowing through the source water pipe 12 and send the obtained flow rate data to the control device 80 described later. The liquid property detection sensor 26 is installed to detect the electrolyte of water flowing in the source water pipe 12 and send the obtained data to the control device 80 described later.

  An acid aqueous solution storage tank 32 stores an acid aqueous solution (eg, hydrochloric acid, acetic acid). The acid aqueous solution (acid is added) from the acid aqueous solution storage tank 32 to the check 30 of the source water pipe 12 through the acid aqueous solution supply pipe 34. In the case of hydrochloric acid, the concentration is 8.5 to 9.0% w / v). A tube sensor 36 and an acid aqueous solution supply pump 38 are provided in this order from the side close to the acid aqueous solution storage tank 32 in the acid aqueous solution supply pipe 34.

  Here, the tube sensor 36 is provided for detecting liquid breakage such as hydrochloric acid and detecting bubbles. The acid aqueous solution supply pump 38 is a metering pump, and sends an acid aqueous solution such as hydrochloric acid at a constant flow rate. The acid aqueous solution supply pipe 34 and the acid aqueous solution supply pump 38 serve as the acid aqueous solution supply means in the present invention.

  The acid dilution column 14 includes a diffusion unit 40 that diffuses the aqueous acid solution supplied from the aqueous acid solution storage tank 32 into the water supplied from the water source 10, and a container unit 42 that surrounds the diffusion unit 40. As shown in FIG. 2, the diffusing portion 40 is composed of a pipe-shaped member having a distal end portion closed, a base portion opened, and a plurality of through holes in the periphery. The downstream end of the acid aqueous solution supply pipe 34 is connected to the base of the diffusion section 40.

  A mixing column 46 is connected to the downstream side of the acid dilution column 14 via a dilute acid aqueous solution pipe 44. The dilute acid aqueous solution pipe 44 is provided with a backflow prevention valve 48 immediately before the mixing column 46. And the acid dilution column 14 becomes a dilution mixing part in this invention.

  50 is a sodium hypochlorite aqueous solution storage tank for storing a sodium hypochlorite aqueous solution (stock solution). A sodium hypochlorite aqueous solution (stock solution) is supplied from the sodium hypochlorite aqueous solution storage tank 50 to the mixing column 46 via the sodium hypochlorite aqueous solution supply pipe 52. As for the sodium hypochlorite aqueous solution (stock solution), it is preferable to use a solution having an effective chlorine concentration of 5% or 12% or more according to the amount of weakly acidic water used.

  The sodium hypochlorite aqueous solution supply pipe 52 includes a bubble removing device 54, a tube sensor 56, a sodium hypochlorite aqueous solution supply pump 58, and a backflow prevention valve 60 from the side close to the sodium hypochlorite aqueous solution storage tank 50. They are provided in this order.

  Here, as shown in FIG. 3, the bubble removing device 54 includes a deaeration container 62, a return pipe 64 connected to the deaeration container 62, and a return pump 66 provided in contact with the return pipe 64. . The deaeration container 62 is a three-way pipe provided with a branch pipe on the side of the main pipe provided substantially vertically. The return pipe 64 is connected to the upper end part 62a of the deaeration container 62. It is connected to a sodium chlorite aqueous solution storage tank 50.

  The lower end 62b of the deaeration vessel 62 is connected to the sodium hypochlorite aqueous solution storage tank 50 via the sodium hypochlorite aqueous solution supply pipe 52, and the side end 62c of the deaeration vessel 62 is connected to the sodium hypochlorite aqueous solution. A sodium hypochlorite aqueous solution supply pump 58 is connected via a supply pipe 52.

  Moreover, the tube sensor 56 is for detecting the liquid shortage and air bubbles of the sodium hypochlorite aqueous solution (stock solution). The sodium hypochlorite aqueous solution supply pump 58 is a metering pump, and supplies the sodium hypochlorite aqueous solution (stock solution) in the sodium hypochlorite aqueous solution storage tank 50 to the mixing column 46 by a certain amount. . The sodium hypochlorite aqueous solution supply pipe 52 and the sodium hypochlorite aqueous solution supply pump 58 serve as the sodium hypochlorite aqueous solution supply means in the present invention.

  As shown in FIGS. 4 and 5, the mixing column 46 includes a diffusion portion 68 for diffusing a sodium hypochlorite aqueous solution (stock solution) into the dilute acid aqueous solution, and a container portion 70 surrounding the diffusion portion 68. The part 68 is connected to the downstream end of the sodium hypochlorite aqueous solution supply pipe 52. And the mixing column 46 becomes a mixing reaction part in this invention.

  A stirring tank accumulator 74 is provided on the downstream side of the mixing column 46 via a first sterilizing water pipe 72, and a liquid property detection sensor 76 is provided in the middle of the first sterilizing water pipe 72. A second sterilizing water pipe 78 is connected to the downstream side of the stirring tank accumulator 74, and the sodium hypochlorite diluted water (sterilizing water) generated in the mixing column 46 passes through the stirring tank accumulator 74 and the second sterilizing water pipe 78. Via the outside.

  Here, the liquid property detection sensor 76 separates and detects the electrolyte component and the amount of hydrogen ions of the sterilizing water generated in the mixing column 46, and sends the obtained data to the control device 80 described later. The agitation tank accumulator 74 is provided to homogenize the liquidity and prevent concentration change and water hammer due to a sudden stop of the water flowing in the apparatus.

  As shown in FIG. 6, the control device 80 includes an acid aqueous solution supply pump controller 82 that controls the acid aqueous solution supply pump 38 and a hypochlorite solution that controls the sodium hypochlorite aqueous solution supply pump 58. A sodium chlorate aqueous solution supply pump control unit 84 and a solenoid valve control unit 86 are provided.

  The acid aqueous solution supply pump control unit 82 calculates the supply amount of the required acid aqueous solution from the relationship between the flow rate data obtained by the flow sensor 24 and the predetermined amount of water and the acid aqueous solution supply amount, so that this value can be obtained. The acid aqueous solution supply pump 38 is controlled to supply a necessary amount of the acid aqueous solution to the acid dilution column 14.

  The sodium hypochlorite aqueous solution supply pump control unit 84 determines the necessary hypochlorite from the relationship between the flow rate data of the water obtained by the flow sensor 24 and the predetermined amount of water and the amount of sodium hypochlorite aqueous solution (stock solution) supplied. Calculate the amount of sodium chlorate aqueous solution (stock solution) supplied, control the sodium hypochlorite aqueous solution supply pump 58 to obtain this value, and mix the required amount of sodium hypochlorite aqueous solution (stock solution) 46 is supplied.

  Next, the function of this continuous sterilizing water generator will be described.

  When the switch of the control device 80 is turned on, the electromagnetic valve 22 is opened, and water is supplied from the water source 10 through the source water pipe 12 to the acid dilution column 14. At this time, the flow rate sensor 24 measures the flow rate of water passing through the source water pipe 12 and sends the flow rate data to the control device 80.

  The acid aqueous solution supply pump controller 82 of the control device 80 obtains the flow rate of the acid aqueous solution required to be sent to the acid dilution column 14 from the flow rate data of the water and the concentration of the acid aqueous solution inputted in advance, and controls the acid aqueous solution supply pump 38. Then, the acid aqueous solution at this flow rate is sent to the acid dilution column 14.

  The acid aqueous solution sent by the acid aqueous solution supply pump 38 is sent to the acid dilution column 14 and is diffused into water by the diffusion unit 40 of the acid dilution column 14 to generate a dilute acid aqueous solution. The produced dilute acid aqueous solution is sent to the mixing column 46 through the dilute acid aqueous solution pipe 44.

  Further, the sodium hypochlorite aqueous solution supply pump control unit 84 of the control device 80 requires hypochlorous acid to be sent to the mixing column 46 from the flow rate data of water and the concentration of the sodium hypochlorite aqueous solution (stock solution) inputted in advance. The flow rate of the aqueous sodium chlorite solution (stock solution) is obtained, and the sodium hypochlorite aqueous solution supply pump 58 is controlled to send the aqueous sodium hypochlorite solution (stock solution) at this flow rate to the mixing column 46.

  Here, the sodium hypochlorite aqueous solution (raw solution) that has entered the sodium hypochlorite aqueous solution supply pipe 52 from the sodium hypochlorite aqueous solution storage tank 50 is removed before it enters the sodium hypochlorite aqueous solution supply pump 58. Air bubbles that have passed through the device 54 and have been suspended in the aqueous sodium hypochlorite solution (stock solution) are removed. For this reason, when bubbles are accumulated in the sodium hypochlorite aqueous solution supply pump 58, the sodium hypochlorite aqueous solution supply pump 58 is idled, and the supply of the sodium hypochlorite aqueous solution (stock solution) to the mixing column 46 is stopped. Is prevented.

  The sodium hypochlorite aqueous solution (stock solution) sent by the sodium hypochlorite aqueous solution supply pump 58 is sent to the mixing column 46 and diffused into the dilute acid aqueous solution by the diffusion section 68 of the mixing column 46, where it is weakened. Acidic sodium hypochlorite dilution water, i.e. sterilizing water, is produced.

  In this manner, since the alkaline sodium hypochlorite aqueous solution (stock solution) is injected and diffused into the dilute acid aqueous solution by the mixing column 46, the water flowing in the apparatus does not have an opportunity to become alkaline, and the inside of the apparatus There is no situation where scale components such as calcium and magnesium are precipitated from the water flowing through and are deposited and fixed to any part of the flow path.

  For this reason, various troubles such as a decrease in the chlorine ion concentration caused by the adhesion of the scale component to any part of the flow path are eliminated, and therefore maintenance for correcting such troubles becomes unnecessary for a long time.

  In addition, the continuous production | generation apparatus of the sterilization water of this invention is not limited to above-described embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

  For example, it can be applied to sterilize pool and bathtub water, drain water from pools and bathtubs, add acid such as hydrochloric acid to the extracted water, and then make hypochlorous acid into the acidified water. A sodium aqueous solution (stock solution) may be injected to eliminate the situation where the injection port of the sodium hypochlorite aqueous solution is narrowed or clogged due to the precipitation of scale.

  The present invention not only generates and supplies sterilized water for sterilizing the hands of persons engaged in medical and food processing, but also generates a bactericidal mist that sterilizes bacteria and viruses floating in the air. It can also be used to produce and supply sterilized water.

It is explanatory drawing of one Example of this invention apparatus. It is explanatory drawing of the dilution column of one Example of this invention apparatus. It is explanatory drawing of the bubble removal apparatus of one Example of this invention apparatus. It is explanatory drawing of the mixing column of one Example of this invention apparatus. It is a reverse view of the spreading | diffusion part of FIG. It is explanatory drawing of a control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water source 12 Source water piping 14 Acid dilution column 16 Systurn 18 Pressure reducing valve 20 Filter 22 Solenoid valve 24 Flow rate sensor 26 Liquidity detection sensor 28 Backflow prevention valve 30 Check 32 Acid aqueous solution storage tank 34 Acid aqueous solution supply piping 36 Tube sensor 38 Acid aqueous solution Supply pump 40 Diffusion section 42 Container section 44 Dilute acid aqueous solution pipe 46 Mixing column 48 Backflow prevention valve 50 Sodium hypochlorite aqueous solution storage tank 52 Sodium hypochlorite aqueous solution supply pipe 54 Bubble removing device 56 Tube sensor 58 Hypochlorous acid Sodium aqueous solution supply pump 60 Backflow prevention valve 62 Deaeration container 62a Upper end part 62b Lower end part 62c Side end part 64 Return pipe 66 Return pump 68 Diffusion part 70 Container part 72 First sterilization water pipe 74 Stirring tank accumulator 76 Liquidity detection sensor 78 Second sterilization water piping 80 control equipment 82 acid solution supply pump control unit 84 Sodium hypochlorite solution supply pump control unit 86 solenoid valve control unit

Claims (7)

  An acid aqueous solution storage tank for storing an acid aqueous solution, an acid aqueous solution supply means for supplying an acid aqueous solution of the acid aqueous solution storage tank, an acid aqueous solution supplied by the acid aqueous solution supply means, and a water supply source from a water supply source A diluting and mixing section for mixing the water supplied in this manner, a sodium hypochlorite aqueous solution storage tank storing a sodium hypochlorite aqueous solution, and a sodium hypochlorite aqueous solution in the sodium hypochlorite aqueous solution storage tank Sodium hypochlorite aqueous solution supply means for supplying the diluted sodium hydroxide aqueous solution supplied by the sodium hypochlorite aqueous solution supply means to the diluted acid aqueous solution obtained in the dilution mixing unit A mixing reaction part for mixing the aqueous sodium hypochlorite solution, a pH sensor for measuring the pH value of the sterilized water produced in the mixing reaction part, and the p A sterilizing water comprising: a control device for controlling the acid aqueous solution supply means and the sodium hypochlorite aqueous solution supply means based on a pH value measured by the sensor and a flow rate obtained by the flow sensor. Continuous generation device.   The control device calculates a necessary amount of the acid aqueous solution to be supplied to the dilution mixing unit from the flow rate of water obtained by the flow sensor and the concentration of the acid aqueous solution in the acid aqueous solution storage tank, and based on the calculation result 2. The sterilization according to claim 1, further comprising an acid aqueous solution supply amount control unit that controls the acid aqueous solution supply unit to supply the acid aqueous solution supply unit with a necessary amount of acid aqueous solution to the dilution mixing unit. A continuous water generator.   The controller controls the flow rate of water obtained by the flow sensor and the concentration of the sodium hypochlorite aqueous solution in the sodium hypochlorite aqueous solution storage tank. The required amount is calculated, and based on the calculation result, the sodium hypochlorite aqueous solution supply means is controlled, and the sodium hypochlorite aqueous solution supply means supplies the sodium hypochlorite aqueous solution supply means to the mixing reaction section. The continuous production | generation apparatus of the sterilizing water of Claim 1 or 2 provided with the sodium hypochlorite aqueous solution supply amount control part to supply.   The control device obtains an increase amount of the sodium hypochlorite aqueous solution from the pH value obtained by the pH sensor, and hypochlorous acid by the sodium hypochlorite aqueous solution supply means based on the obtained increase amount. The supply amount of the aqueous sodium solution is increased, and then the increase amount of the diluted acid aqueous solution is obtained from the pH value of the generated sterilizing water, and the supply amount of the aqueous acid solution by the acid aqueous solution supply means is determined based on the obtained increase amount. The continuous production | generation apparatus of the sterilization water in any one of Claims 1-3 provided with the supply amount correction | amendment part to increase.   The sodium hypochlorite aqueous solution supply means includes a sodium hypochlorite aqueous solution supply pump for sending the sodium hypochlorite aqueous solution in the sodium hypochlorite aqueous solution storage tank to the mixing reaction section, and the sodium hypochlorite The continuous production | generation apparatus of the sterilization water in any one of Claims 1-4 provided with the bubble removal apparatus provided in the upstream of the aqueous solution supply pump.   The continuous production apparatus for sterilized water according to any one of claims 1 to 5, further comprising a stirring tank accumulator for retaining the sterilized water produced in the mixing reaction section.   The mixed dilution section and the mixing reaction section are composed of a common mixing container, and the upstream side of the mixing container is a mixing dilution section, and the downstream side of the mixing container is a mixing reaction section. The continuous production | generation apparatus of sterilization water in any one of.

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