JP2009090214A - Sterile water production apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sterile water production apparatus which can correctly, efficiently and easily supply a hypochlorite solution to raw water without causing back flow, consequently can easily provide sterile water having a prescribed pH value and free from mixed spots, and further, can securely, safely and efficiently exhaust gaseous chlorine to be generated. <P>SOLUTION: Raw water is supplied to a first mixing-stirring machine 2, a hypochlorite solution having a prescribed concentration is supplied from a sodium hypochlorite solution vessel 9 to the raw water by tube pumps P1, P2, further, an acidic liquid having a prescribed concentration is supplied from an acidic solution vessel 12 to the aqueous solution of the hypochlorite, and they are mixed and stirred. At this time, the tube parts of the tube pumps 11 are pressed and adjusted by tube pressing machines T1, T2, so that the back flow of the solution is prevented. After the mixing and stirring by the first mixing-stirring machine 2, the solution is further mixed and stirred by a second mixing-stirring machine 36 to generate sterile water having a prescribed pH. Gaseous chlorine generated upon the mixing-stirring is exhausted from valve elements disposed at the upper parts of the mixing-stirring machines 2, 36. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for producing sterilized water having hypochlorous acid by mixing and stirring a hypochlorite solution and an acidic solution with raw water such as tap water, well water, and water.

  Sterilized water is used to sterilize dishes, foods, cooking utensils, containers, hands, etc. in restaurants, hospitals, hotels, department stores, superstores, restaurants, etc., cooking plants, restaurants, treatment rooms, toilets, Widely used in hand washing areas.

  As a method for producing this sterilized water, there are a method of administering chlorine, ozone, ultraviolet rays, chemicals, etc. to raw water, a method of electrolyzing salt water, and the like. It is known that sodium chlorite solution and hydrochloric acid solution are mixed to produce hypochlorous acid in raw water and sterilized by this hypochlorous acid (Patent Document 1). In this case, it is also known that when the pH value of the sterilizing water is in the range of 3 to 7, the sterilizing power of the hypochlorous acid acts strongly to obtain a large sterilizing effect.

  The device described in Patent Document 1 is a device for producing water by adding water added with sodium hypochlorite and water added with hydrochloric acid through an permeable membrane and mixing them with a valve mixer. However, when a large amount of sterilizing water is used to react sodium hypochlorite water and hydrochloric acid water through the permeable membrane in this way, the reaction by the permeable membrane is not in time, and the reaction is uneven and the spots are constant. In some cases, the sterilized water having the pH value cannot be produced, and it is necessary to provide a separate permeable diaphragm, which is troublesome and inefficient in work and costly. Furthermore, since sodium hypochlorite water and hydrochloric acid water after the reaction are mixed with a valve mixer, it is not possible to obtain sterilized water in an evenly mixed state according to changes in the amount of sterilized water used. Since sodium hypochlorite and hydrochloric acid circulate in the pipe, the pipe may be corroded by the sodium hypochlorite and hydrochloric acid. Further, since this device is not provided with a device for discharging chlorine gas generated when sodium hypochlorite and hydrochloric acid react with each other, the device using chlorine gas is damaged or the chlorine gas is unnecessary for sterilizing water. The pH value may be changed.

  As another device, sodium hypochlorite water and hydrochloric acid water are fed using a tube pump, and these sodium hypochlorite water and hydrochloric acid water are mixed in a mixing container. It is considered that the chlorine gas generated in the gas is discharged from a bubble discharge pipe provided in the upper part of the mixing container (Patent Document 2).

  In this patent document 2, sodium hypochlorite water and hydrochloric acid water are respectively fed using a tube pump, and this tube pump presses the tube portion sequentially with a plurality of rollers. Therefore, the pressing force cannot sufficiently correspond to the backflow pressure generated in accordance with the fluctuation of the supply amount of the sterilizing water, and the sodium hypochlorite water and the hydrochloric acid water are equal. In some cases, it is impossible to obtain an accurate pH value by backflowing in the inner tube portion. In addition, this tube pump is in a state where friction is generated between the tube portion and the roller during use, and thereby the tube portion is pulled in, and the tube portion is kept pressed after use. The tube part may be damaged. Furthermore, this apparatus is provided with a mixing container and discharges chlorine gas from a bubble discharge pipe provided at the top thereof. However, since this bubble discharge part is not provided with an appropriate discharge valve, the mixing container The liquid inside may flow out from the bubble discharge section.

As such a method for discharging bubbles, the inventor of the present application invented a bubble removing device that removes bubbles previously contained in a liquid, and this invention has been patented (Patent Document 3). The device according to this patent swirls a fluid in a main body to cause it to flow, collect bubbles in the fluid at a central shaft portion provided at the center of the main body, and a cylinder provided at the upper portion of the main body with the collected bubbles. It is made to discharge | emit through the valve body comprised from the cap-shaped float which covers a cylinder.
Japanese Patent No. 2852461 (column 2, line 10 to column 3, line 6, FIG. 2) Japanese Unexamined Patent Publication No. 2004-181275 (paragraphs 0028, 0053, 0059, 0062), FIGS. 2 to 4) Japanese Patent No. 3588771 (paragraphs 0009 to 0015, 0017 to 0019, FIGS. 1 and 3)

  The present invention solves the conventional problems, and can reliably and efficiently supply hypochlorite liquid and acidic liquid to raw water efficiently and simply with an accurate supply amount without backflow. A sterilized water production apparatus capable of easily obtaining sterilized water having a predetermined pH value without mixing and stirring and capable of reliably and safely discharging chlorine gas generated during mixing and stirring. It is something to be offered.

  The present invention uses a tube pump as means for supplying hypochlorite liquid and acidic liquid to raw water in a sterilizing water production apparatus, and the tube pump is provided with a means for pushing the tube part, and this means pushes the tube part. The amount of contact is adjusted to prevent backflow of the liquid and to prevent breakage of the tube portion.

  In addition, the present invention shares the drive shaft of a tube pump that supplies hypochlorite liquid and acidic liquid, and supplies hypochlorite liquid and acidic liquid with a single tube pump for economy. It is intended to be illustrated.

  Furthermore, the present invention provides a spring that urges the tube portion of the tube pump in a direction to return it to its original position, thereby preventing the tube portion from being pulled in by friction with a roller in contact with the spring and reducing the friction. It is what you do.

  The present invention also includes a first mixing and stirring device and a second mixing and stirring device as a mixing and stirring device for mixing and stirring the raw water, hypochlorite solution, and acidic solution. A chlorite solution and an acidic solution are mixed and stirred, and the mixed water is further mixed and stirred with a second mixing and stirring device so that sterilized water having a uniform sterilization concentration can be obtained. Further, the mixing and stirring device is provided with a valve body equipped with a float attached to a cylinder having an exhaust hole so as to be movable up and down in a cap shape so that chlorine gas is surely discharged.

  Further, the present invention provides the inlet of raw water, hypochlorite liquid and acidic liquid at positions separated sequentially from the upper part to the lower part of the mixing and stirring apparatus, and the raw water and hypochlorite are mixed in the mixing and stirring apparatus. The liquid is mixed and stirred, and then the acidic liquid is mixed with the mixed liquid and stirred.

  Further, the pipe for feeding the hypochlorite solution and the acid solution is formed of a chemical resistant material such as tetrafluoroethylene resin (“Teflon” registered trademark).

  The present invention stably and efficiently supplies sterilized water having a predetermined pH value by supplying an appropriate amount of hypochlorite solution and acid solution to the raw water without being affected by fluctuations in the amount of raw water used. In addition, the raw water, hypochlorite liquid, and acidic liquid can be mixed and stirred efficiently and accurately, and chlorine gas generated during mixing and stirring can be discharged reliably. A durable device can be obtained economically.

  FIG. 1 shows an outline of an apparatus for producing sterilizing water by mixing and stirring a hypochlorite solution and an acidic solution in raw water (tap water).

  The tap water flows into the first mixing agitator 2 from the inlet 41 through the pipe line 1. The pipe 1 is provided with a main valve 3, a pressure switch 4, an electromagnetic valve 5, and a flow rate sensor 6. When the main valve 3 is opened, the water pressure is detected by the pressure switch 4 to detect the presence or absence of flowing water. As a result, the electromagnetic valve 5 is opened and closed, and the amount of tap water flowing in the pipe 1 is detected by the flow sensor 6. The operations of the pressure switch 4, the electromagnetic valve 5, and the flow sensor 6 are controlled and controlled by the sequencer control unit 7 and the operation unit 8.

  The sodium hypochlorite solution sent by the tube pump 11 (P1) from the sodium hypochlorite solution container 9 through the pipe line 10A to the tap water flowing into the first mixing agitator 2 is supplied to the first mixing agitator 2. It is made to flow in from the inflow port 42 and is mixed with the tap water by the first mixing agitator 2 and stirred. A hydrochloric acid solution fed by the tube pump 11 (P2) from the hydrochloric acid solution container 12 through the pipe line 10B is introduced into the mixed and stirred water from the inlet 43 of the first mixing stirrer 2 so that the first mixing stirrer is mixed. 2. Mix with mixed water and stir. In this case, there is a method in which the sodium hypochlorite solution and the hydrochloric acid solution are simultaneously added to tap water and mixed and stirred, or the hydrochloric acid solution is first added to tap water and then the hydrochloric acid solution is added. In this way, tap water, sodium hypochlorite solution and hydrochloric acid solution inlets 41, 42 and 43 are formed at positions shifted sequentially from the upper part to the lower part of the first mixing stirrer 2, If sodium hypochlorite solution is mixed and stirred, and then mixed with hydrochloric acid solution and stirred, there will be no unevenness and the efficiency of mixing will reach the prescribed pH value early by mixing. Can do.

  In the examples, a sodium hypochlorite solution for food with a concentration of 12% is used, and a hydrochloric acid solution for food with a concentration of 8.5% is used. Sodium chlorate solution and hydrochloric acid solution can be used. In any case, the pH value of the sterilized water finally obtained when these chemical solutions are added to tap water, mixed and stirred to produce sterilized water is about 7 The concentration of sodium hypochlorite solution and hydrochloric acid solution is controlled so as to be about the same. In this case, when the sodium hypochlorite solution and the hydrochloric acid solution are consumed and the containers 9 and 12 are exchanged, the size of the container is changed so that the containers 9 and 12 are not misplaced. In the example, the sodium hypochlorite liquid container 9 is formed to be about half the size of the hydrochloric acid liquid container 12), and the container can be changed by changing its shape, changing the color of the container, etc. You may make it prevent misunderstanding. The tube pumps P1 and P2 are provided with a cover 68 as shown in the figure, so that even if the tube is broken, the sodium hypochlorite solution and the hydrochloric acid solution do not come into contact with each other. Occurrence is prevented.

  The sodium hypochlorite solution can be replaced with an alkali metal salt such as potassium hypochlorite, or other inorganic acid solution can be used instead of the hydrochloric acid solution. The sterilizing water may have a pH value of about 3 to 7 depending on use. The pipes 10A and 10B are made of a fluororesin such as tetrafluoroethylene resin ("Teflon" registered trademark) or other chemical-resistant material so that it can sufficiently withstand these alkali metal salts and inorganic acid solutions. ing.

  2 to 4, the tube pump 11 (P1 and P2) is pivotally attached to the base 13 so as to be swingable, and is held in a predetermined position by an actuating member 15 described later. The tube portions 10A and 10B have a rotating body 17 that is rotated by a motor M with a reduction gear 65 interposed therebetween, and a roller 18 provided on the rotating body is guided by the guide surface 19 of the pushing member 16. This is a liquid feed pump having a mode in which the liquid in the tube part is fed by pressing the liquid into the tube and sequentially feeding out the liquid in the tube. In this case, in the embodiment, the tube pump P1 and the tube pump P2 are of the same type, and these tube pumps are driven by the drive shaft 21 of one motor M. There is a big difference in changing the diameter of the tube part of the tube pump, changing the type and amount of sodium hypochlorite solution and hydrochloric acid solution, and the liquid feeding of sodium hypochlorite solution and hydrochloric acid solution. In some cases, each pump may be driven by a separate motor. In this case, by changing the diameter of the roller 18 of the tube pumps P1 and P2 to be larger or smaller, it is possible to reduce the damage and pull-in amount of the tube portion without causing a large rotational difference between the two drive shafts 27. When the drive shaft 21 is a single shaft, the drive shaft 27 is supported by the bearing 22. Further, when the tube pumps P1 and P2 are replaced, the pins 70 provided on the collar 69 attached to the drive shaft 27 are inserted / removed.

  The tube portion 20 of the tube pump 11 (P1 and P2) prevents the liquid from flowing backward from the portion by pressing the pressing member 16 against the roller 18 of the rotating body and sufficiently crushing it as described above. However, since the tube part is soft and has a certain thickness, when pressing it, the pressing force becomes weak depending on the pressure applied, and the liquid leaks from the pressing part and partially flows backward. In some cases, an accurate amount cannot be reliably delivered. In particular, when the liquid pressure increases due to changes in the water pressure of tap water, changes in the pressure of mixed water in the mixing stirrer, etc., the tendency is strong. The amount of pressing is very delicate. The number of the rollers 18 is four in the illustrated one, but this may be two or three or other plural ones according to the specification.

As described below, the pushing member 16 is swung by the actuating member 15 so as to prevent the liquid from flowing backward during the operation of the tube pump 11 (P1 and P2). Appropriate pressure is formed.
In the embodiment, the pushing member 16 of the tube pump 11 (P1 and P2) is oscillated by the movement of the operating member 15 that contacts the pressing member 16 via the cam surface 23, and the movement of the operating member 15 is reduced by the speed reducer. No. 66 is performed by motors M1 and M2. In the illustrated example, the screw hole member 25 is fixed to the support portion 24 of the actuating member 15, and the screw portion 28 of the drive shaft 27 of the motors M <b> 1 and M <b> 2 is screwed into the screw hole 26 of the screw hole member. The actuating member 15 is reciprocated by driving M2. When the generation of the sterilizing water is finished, the pushing member 16 can be swung outward by the movement of the operating member 15 to release the pressure on the tube portion 20, thereby the tube portion 20. Can reduce the damage.

  In the embodiment, the cam surface 23 with which the pressing member 16 and the operating member 15 abut is formed with a slope at the corner of the pressing member 16, and on the other hand, the operating member 15 is formed with a slope so as to engage with the slope. However, other forms, for example, the corners of the pressing member 16 may be curved, slightly rounded, or other cam surfaces may be used.

  As another method of swinging the push member 16, a pulley is provided on the drive shaft of the motor, and a string fixed to the distal end portion of the push member 16 is wound around the pulley, or the tip member of the push member 16 is unwound. An appropriate method such as a method of applying a member that moves up and down to the lower surface and swinging the pressing member 16 with this member can be used.

  The push member 16 is provided with a support member 29 for supporting the tube portion 20. A hole 30 larger than the tube diameter is formed in the support member, and the tube portion is inserted into the hole. In addition, a compression spring 32 is provided between the connection portion 31 on one end side of the tube portion and the support member 29, and the spring prevents the tube portion from being pulled by the roller 18 of the tube pump and is caused by friction with the roller. Abrasion is prevented.

  A leak receiver 33 is provided below the tube pump 11. A leak sensor 34 attached to the leak receiver 33 detects the leak of the liquid, and the sequencer control unit 7 controls the signal with the signal. Each of the sodium hypochlorite liquid container 9 and the hydrochloric acid liquid container 12 is provided with a liquid level sensor 35. The liquid level sensor detects the amount of liquid, and is controlled by the sequencer controller 7 based on the signal. is doing. From the detection result of the liquid amount, the containers 9 and 12 can be exchanged or switched to a spare container placed adjacently.

Next, the 1st mixing stirrer 2 and the 2nd mixing stirrer 36 which mix and stir tap water, sodium hypochlorite liquid, and hydrochloric acid liquid are demonstrated in detail using FIG.5 and FIG.6A-C.
The first mixing agitator 2 includes a cylindrical space 37 formed in an upper portion, a lower inverted conical space 38 formed continuously in the space, and a small cylindrical space 39 following the space. A main body 40 is provided. In the main body, a tap water inlet 41, a sodium hypochlorite liquid inlet 42, and a hydrochloric acid liquid inlet 43 are sequentially formed in a cylindrical space at positions shifted from the upper part toward the lower part. The mixed water outlet 44 is formed so as to open in the tangential direction with respect to the small cylindrical space 39. As a result, the tap water, sodium hypochlorite solution and hydrochloric acid solution flowing into the cylindrical space 37 are sequentially mixed and stirred in the cylindrical space 37 and the inverted conical space 38. It flows out from the inflow port 44.

  A central shaft 45 is provided at the central portion of the main body 40, and bubbles of chlorine gas generated during mixing and stirring are gathered on the central shaft. It is made to discharge from the valve body 46 provided in the.

  The main body 40 is provided with a lid body 48 that is fixed to the screw 47 via a packing. The lid body has a valve chamber 49 that accommodates the valve body 46, and the exhaust chamber is communicated with the valve chamber 49. An outlet 50 is formed. The valve body 46 is formed integrally with a substrate 51 supported between the main body 40 and the lid body 48 and has a cylinder 53 having a through hole 52 at the center thereof, a cylindrical portion 54 covering the outer peripheral surface of the cylinder, and an upper surface. A cap-like float 56 having a plate portion 55 covering the upper and lower portions is provided. In this example, a substrate 51 supported between the main body 40 and the lid 48 is provided. However, instead of the substrate 51, a base is provided at the lower portion of the cylinder 53, and a screw is formed around the base. The screw portion may be structured to be screwed into a screw hole formed in the lower portion of the valve chamber 49, or may have another structure.

  The slit 57 between the inner peripheral surface of the float 56 and the outer peripheral surface of the cylinder and the slit 58 between the outer peripheral surface of the float 56 and the inner peripheral surface of the valve chamber 49 are difficult to pass mixed water and only chlorine gas passes through. It is formed in such a narrow gap as possible, for example, about 0.05 to 0.3 mm, preferably about 0.1 to 0.2 mm.

  FIG. 6A shows a state where the internal pressure of the chlorine gas generated from the mixed water has not yet been increased to the extent that the float 56 is pushed up when the chlorine gas is collected at the upper part of the main body 40. When the internal pressure is sufficiently increased after the collection of the chlorine gas, the chlorine gas pushes up the float 56 as shown in FIG. 6B. Thus, the chlorine gas that has passed through the through hole 52 passes through the slit 57 between the inner peripheral surface of the float and the outer peripheral surface of the cylinder, and the slit 58 between the outer peripheral surface of the float and the inner peripheral surface of the valve chamber 49. 50 is discharged. Here, when the flow rate increases and the internal pressure becomes extremely large, and the fluid reaches the float 56 through the through-hole 52, the float 56 causes the inner surface of the valve chamber 49 to move by the pressure as shown in FIG. 6C. Ascending to a position in contact with the upper portion, the discharge port 50 is closed to prevent the mixed water from being discharged from the discharge port 50.

  The mixed water mixed and stirred by the first mixing stirrer 2 flows into the second mixing stirrer 36 through the pipe 59 through the inlet 60. This second mixing stirrer has substantially the same structure as that of the first mixing stirrer 2, but the point and size of the inlet port is only one-half that of the first mixing stirrer 2. However, the second mixing stirrer 36 increases the cycle speed of the second mixing stirrer to stabilize the mixing accuracy. However, the size of the second mixing stirrer 36 increases the amount of sterilizing water used. If necessary, the size can be made approximately the same as that of the first mixing agitator 2.

  The mixed water flowing into the second mixing stirrer 36 is further mixed and stirred in this mixing stirrer, and then sent from the outlet 67 to the use point such as a faucet through the pipe 61. At that time, the pH value is detected by the pH sensor 62 provided in the pipe 61 and controlled by the sequencer control unit 7 based on the signal to adjust the supply amount of the sodium hypochlorite solution and the hydrochloric acid solution. To obtain an appropriate pH value. In this way, the tap water, the sodium hypochlorite solution and the hydrochloric acid solution are reliably mixed and stirred by the first mixing stirrer 2 and the second mixing stirrer 36, and have a predetermined pH value with no spots. You can get water. The second mixing stirrer 36 may be omitted when the supply amount of sterilizing water is small.

  Even when the amount of sterilizing water used varies greatly, the above apparatus changes the pH value by measuring the flow rate sensor 6 or the pH sensor 62, rapidly supplying appropriate amounts of the sodium hypochlorite solution and the hydrochloric acid solution, etc. Can cope with this.

  Further, the chlorine gas generated by the mixing and stirring by the first mixing stirrer 2 and the second mixing stirrer 36 is discharged to the outside through the pipe line 63. When formed with a resin tube, if a pinch valve 64 is provided in the pipe line 63, when the tube part is pressed by the push member 16 of the tube pump 11 at the end of the generation of the sterilizing water, The backflow of the mixed water, the sodium hypochlorite solution, and the hydrochloric acid solution can be prevented by narrowing the tube portion of the pipe line 63 by the pinch valve 64 and stopping the circulation thereof.

It is the schematic of this invention apparatus. It is an enlarged top view which shows the tube pump and the pressing means of the tube part which abbreviate | omitted partially. It is a front view which shows the tube pump and the pressing means of the tube part. It is an enlarged schematic diagram showing a pressing member of the pressing means. It is an expanded sectional view of a 1st mixing stirrer. It is expansion explanatory drawing of the valve body part of a mixing stirrer.

Explanation of symbols

  2 First mixing stirrer 6 Flow rate sensor 7 Sequencer control unit 9 Sodium hypochlorite liquid container 11 Tube pump 12 Hydrochloric acid liquid container 15 Actuating member 16 Pushing member 18 Roller 36 Second mixing stirrer 46 Valve element 53 Cylinder 56 Float 62 pH sensor

Claims (8)

  The raw water is supplied to a mixing stirrer having a bubble outlet, and a hypochlorite liquid having a predetermined concentration is supplied to the raw water from a hypochlorite liquid container through a pipe line through a pipe pump. An acidic solution having a predetermined concentration is supplied from an acidic solution container, and when each of these solutions is supplied, it is mixed and stirred by the mixing stirrer to produce sterilized water having a predetermined pH value. The tube pump has a pressing means capable of adjusting the amount of pressing against the tube portion.   The pressing means is a swingable supported pressing member that presses the tube portion of the tube pump, and the pressing member is brought into contact with the pressing member via a slanted cam surface to swing the pressing member and the amount of pressing is reduced. The sterilizing water production apparatus according to claim 1, further comprising an operating member to be adjusted.   The sterilizing water production apparatus according to claim 1 or 2, wherein the drive shaft of the tube pump on the hypochlorite solution supply side and the tube pump on the acid solution supply side are shared and used as a single shaft.   The sterilizing water production apparatus according to any one of claims 1 to 3, wherein the tube pump is provided with a spring that can be urged in a direction to return to the original position so as to correspond to the pulling action of the tube portion at the time of driving.   The mixing stirrer further mixes and stirs the first mixed stirrer which supplies raw water, hypochlorite liquid and acidic liquid to this and mixes and stirs them, and the mixed water which is mixed and stirred by this first mixed stirrer. The sterilizing water production apparatus according to any one of claims 1 to 4, further comprising a second mixing stirrer.   6. The sterilizing water production according to any one of claims 1 to 5, wherein the mixing stirrer is provided at a position where each inlet of raw water, hypochlorite liquid and acidic liquid is sequentially shifted from the upper part toward the lower part. apparatus.   The mixing stirrer includes a main body having a cylindrical space in the upper portion and an inverted conical space continuous in the lower portion in the lower portion, and the inflow port so that the liquid flowing into the main body swirls and mixes and stirs. Is provided in the tangential direction of the cylindrical space, an outlet is provided at the lower part of the main body, a central axis for collecting bubbles at the central part in the main body, and a gas outlet at the upper part of the main body. A valve chamber partitioned by a substrate having a through hole is formed, and a cylinder having a through hole communicating with the through hole is provided on the substrate, and a cap-like float that can cover the outer peripheral surface and the upper surface of the cylinder is placed up and down. The sterilizing water production apparatus according to any one of claims 1 to 6, which is movably mounted.   The sterilizing water production apparatus according to any one of claims 1 to 7, wherein pipes for sending the hypochlorite liquid and the acidic liquid to the mixing stirrer are each formed of a chemical-resistant material such as tetrafluoroethylene resin.

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