JP3019414B2 - Automatic control method of residual chlorine and pH of stored water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for automatically controlling the residual chlorine and pH in stored water such as pool water to an optimum state at all times.

[Conventional technology]

It has been proposed to automatically measure the concentration of residual chlorine in water and to control the amount of chlorine-based drug added based on the signal (see JP-A-62-141267 and JP-A-2-90994).

[Problems to be solved by the invention]

In the conventional automation method, the addition of a liquid chlorinating agent is relatively easy to automatically control, but the solid chlorinating agent is a solid, so that a quantitative supply method is difficult.

Usually, supply of solid chlorine agent by screw feeder, vibration feeder, table feeder, etc. can be considered, but these are not durable for the material to chlorine,
There was no one that could fit this system satisfactorily due to lack of quantitation, too high a price, too precise to use durable materials, and inability to prevent moisture absorption into the drug.

Therefore, there has been a demand for an apparatus having a high durability, which suppresses moisture absorption of the solid drug as much as possible, has a quantitative property of the solid drug, has a simple structure, has few failures, and has a high durability.

In addition, among the various chlorine agents, the isocyanuric acid-based chlorine agent has a smaller amount of active chlorine (residual chlorine) supplied to the water than the sodium hypochlorite solution or the highly bleached powder, so that the amount used is small. It is widely used because it is completely soluble and has strong bactericidal properties. However, when the isocyanuric acid-based chlorinating agent is supplied continuously or intermittently for a long time in a closed aqueous system, decomposed products of the isocyanuric acid-based chlorinating agent accumulate in water, and the pH may decrease. In particular, this phenomenon is remarkable in water having a low alkalinity or water which is circulated for a long time and relatively easily polluted. There has been a demand for an apparatus that can easily prevent the decrease in pH at the same time as the addition of the solid chlorine agent.

[Means for solving the problem]

The present invention relates to a water circulation line system for purifying water from a water tank and returning the water to the water tank again.
A method that combines a feeder with solid chlorine agent or pH adjuster, especially a durable and quantitative solid chlorine agent with a residual chlorine detector and a pH detector to optimize the residual chlorine and pH in water About.

That is, the present invention relates to a water circulation line system for purifying water from a water storage tank and returning the purified water to the water storage tank; the circulation line system has a detection unit for measuring the concentration of free residual chlorine and the concentration of hydrogen ions; A dissolving tank for dissolving each of the chlorine agent and the solid pH adjuster; and a solid chlorine agent and a solid pH at the top of the dissolving tank.
Having a respective feeder with a hopper for feeding a conditioning agent to each of the dissolution tanks; the feeder is provided at the bottom of the hopper for quantifying the solid chlorine agent or the solid pH adjuster; A reciprocating slide type plate or rod having a vertically penetrating hole, a peripheral portion of a hopper bottom for adhering to the plate or rod and closing the hole from above, and the plate or rod. A reciprocating slide type fixed quantity feeder comprising a pressing portion for supporting the container tightly from below and closing the hole from below; and a vertical cylinder between the feeder and the dissolving tank. And a drug receiver having a conical shape in which the upper part or lower part narrows downward and having a discharge port to the dissolution tank at the lowest part; and a discharge part for air to flow through the lower part of the fixed quantity feeder. Make sure that the air blower inlet is At the top of the wall of the drug receiver located at the bottom and below the metering feeder; furthermore, the pH adjustment of the solid chlorinating agent or the solid falling on the inclined wall of the drug receiver A circulation line system having a discharge section comprising a number of small holes arranged in an annular shape so that the circulating water falls so as to surround the drop point of the agent; control linked to the detection section The driving device for the fixed-quantity feeder is operated according to an instruction from the device, and the solid chlorine agent or the solid pH adjuster is dropped from the hole of each fixed-quantity feeder to the drug receiver and / or the dissolution tank. Dissolving in the dissolving tank with circulating water discharged from the discharge section of the circulating water to form a dissolved solution, and sending the dissolved solution to a circulation line. .

The feature of the present invention is that a device capable of automatically and quantitatively adding both the solid chlorine agent and the solid pH regulator separately and accurately and accurately is installed in the circulation system of the circulating water or the storage water. Reciprocating slide type plate-shaped or rod-shaped, plate-shaped or rod-shaped, in which a feeder for determining the amount of the agent and the solid pH adjuster has a vertically penetrated hole for quantifying the solid chlorine agent or the solid pH adjuster A reciprocating slide type comprising an edge portion of a lower portion of a hopper which is in close contact with an object and closes the hole from above, and a pressing portion for supporting the plate-shaped or rod-shaped object from below and sealing the hole from below. This is a quantitative feeder.

Thus, both the free chlorine concentration and the pH in the circulating water or the storage water can be simultaneously adjusted by adding a solid chlorine agent and / or a pH adjuster using a quantitative feeder unique to the present invention. The structure is simple, the operation is simple, there are few failures, and the plate-like or rod-like material which is a worn part, the edge portion of the lower part of the hopper which is in close contact with the plate-like or rod-like material and closes the hole. And the replacement of the holding portion can be easily performed.

Hereinafter, each part of the medicine and the device used in the method of the present invention will be described in more detail.

The optimal free chlorine concentration in circulating water or storage water is
0.3 to 1.2 ppm, preferably 0.4 to 1.0 ppm
Range.

The optimum pH in the circulating or stored water is in the range from 5 to 8, preferably in the range from 6 to 7.5.

The type of the solid chlorine agent used in the present invention may be any of an isocyanuric acid-based chlorine agent and bleached powder.

The chlorine isocyanurate is usually sodium dichloroisocyanurate or sodium dichloroisocyanurate.
Hydrates, potassium dichloroisocyanurate and trichloroisocyanuric acid. In addition, these chlorine agents further include a disintegration aid such as carboxymethylcellulose and a salt thereof.

The isocyanuric acid-based chlorine agent is usually in the form of powder or granules, but is preferably in the form of granules, and the particle size thereof is usually 0.1 to 5
mm, preferably 0.5 to 4 mm. The type of the pH adjuster is not particularly limited as long as it is solid, but sodium bicarbonate, sodium carbonate and the like are preferable, and the pH adjuster is preferably granular, and the particle size is usually 0.05 to 4 mm, preferably 0.1 to 2 mm.

The detection unit for measuring the concentration of free residual chlorine in water is a sensor, which is a working electrode of a noble metal, for example, platinum or gold, preferably platinum, a noble metal, for example, silver or gold, preferably a silver counter electrode, and an aqueous electrolyte solution. And an ion-selective diaphragm.

The detector that measures the hydrogen ion concentration of the circulating water
Consists of a pH meter.

The information captured by these detectors is converted into a signal by an ordinary method, and drives the drive device via the control device.

The main parts of the feeder for the solid chlorine agent and the solid pH adjuster are a hopper and a metering feeder provided at the bottom thereof.

The hopper may have a lid, part or all of its bottom being closed by the moving slide part of the metering feeder (see below), and the entire bottom being closed. The body part of the hopper is a hollow cylinder, a polygonal cylinder or a square cylinder, and a portion from the upper portion to the bottom portion of the hopper may have a funnel shape narrowing downward. The bottom edge has an inwardly or outwardly extending edge, particularly an outwardly extending edge, and is particularly shaped inwardly or outwardly to close the hole in the reciprocating slide section of the metering feeder described below from above. There are, in particular, outwardly extending edges. This edge portion usually extends in a plate shape.

Also, the outwardly extending, particularly horizontally extending, edge of this bottom may form a lid that covers the top of the drug receiver described below. In this case, an inward or outward, in particular outwardly extending edge portion, which is usually shaped to close the hole of the reciprocating slide portion of the metering feeder from above, forms a part thereof.

Then, the solid matter put in the hopper is discharged to the lower dissolving tank via the fixed amount feeder at the bottom and then through the medicine receiver.

The metering feeder is a reciprocating slide type plate or rod having a vertically penetrating hole for quantifying a solid chlorine agent or a solid pH adjuster, and is in close contact with the plate or rod and the hole is placed from above. This is a reciprocating slide type fixed quantity feeder comprising a peripheral portion of a bottom portion of a hopper to be closed and a holding portion for supporting the plate-like or rod-like material from below and sealing the hole from below.

The cross section of the hole is circular, polygonal to square, and preferably rectangular, the size of which is sufficient for the powdery or granular solid to fill the hole while its top is open. It must be large enough to handle Depending on the depth (length in the vertical direction) of the hole, the minor diameter direction or the shorter side is usually 0.5 cm or more, for example, preferably about 1 to 5 cm.

Since the reciprocating distance of sliding is preferably as short as possible, the side parallel to the moving direction of the rectangle is preferably shorter than the side in the vertical direction.

When the bottom of the hole is closed by the holding part, the hole is closed by the reciprocating slide, and when the upper end of the hole is hung below the peripheral edge extending horizontally from the bottom of the hopper, the hole is closed. All or part of the upper end of the hopper extends from the bottom of the hopper with a surface that is in close contact with the slide portion of the metering feeder and is closed by an edge, or the upper end of the hole is located at the bottom of the hopper. When it is in the open state, it is open for a time or for the whole, so that the above-mentioned solid medicine can be received in the hole.

Then, it is necessary that the hole be filled with the solid matter in the hopper while the upper end of the hole is open.

When the bottom of the hole is not closed by the holding part, most of the hole extends or protrudes in the horizontal direction with the surface in close contact with the slide part of the fixed amount feeder from the bottom of the hopper, and the upper end of the hole is formed by the peripheral edge. It is possible to change from a closed state to an unclosed state, during which the solids in the hole fall into the dissolving tank via the lower drug receiver during the unclosed lower part of the hole.

The holes are composed of one or two lines, and the number of holes in each line is one or more. When there are two rows of holes, one of the rows is in a state of falling from the solid hole, and the other row of holes is in a state capable of receiving the solid from the hopper. The number of holes in each series does not have to match each other. Considering the stress given to the structure by the sliding motion to the sliding portion, it is preferable that there are two systems in terms of fatigue resistance.

The position of this hole arrangement is divided into both left and right directions at the bottom of the hopper when seen through from the side of the hopper, and when one line of holes is in a state enough to drop solids, the other line is fixed. Are so far away that they can be in a state sufficient to accept

The peripheral portion of the bottom of the hopper and the surface of the holding portion, which are in close contact with the moving reciprocating slide portion, which is a plate-like or rod-shaped object, are shaped so as to be able to adhere to the moving reciprocating slide portion.

The moving reciprocating slide part, which is plate-shaped or rod-shaped,
It has a plate shape, a prism shape, or a column shape. The reciprocating slide part of this moving part is easy to process this part and the ease of processing the peripheral part of the bottom of the hopper installed to close the hole and the holding part located at the lower part of the slide part. Considering this, it is preferable that the plate-like material is used.

It is preferable that the peripheral portion of the bottom of the hopper for closing one of the moving reciprocating slide portion and the hole and the holding portion located at the lower portion of the slide portion are installed in a conventional manner so that they can be easily replaced.

The holding part is usually installed by a method of supporting from below, or connecting and hanging from above.

The material of the part in contact with the chemicals of this feeder may be any material such as vinyl chloride resin, acrylic resin, iron, stainless steel, etc. Resins or acrylic resins are preferred.

It is considered that this feeder can also be applied to a powdery or granular solid quantitative feeder that is corrosive and slightly hygroscopic like the solid chlorine agent.

There is usually a drug receiver between the feeder and the dissolution tank. When the circulating water is placed in the dissolution tank, the height from the water surface in the dissolution tank to the fixed-quantity feeder is sufficient, and water droplets generated by stirring of the circulating water and falling solids do not wet the upper fixed-quantity feeder. May not require a drug receiver, but it is preferable that a drug receiver be present in order to use the volume of the dissolving tank effectively.

In addition, when there is no medicine receiver, the intake of the following exhaust air blower and the intake of the outside air for the exhaust air blower are attached to the upper part of the dissolution tank.

The drug receiver has a conical shape in which the upper part or the lower part narrows downward, and the lower part has a flow port to the dissolving tank.

The upper part of the medicine receiver may surround the body of the hopper from the upper part of the periphery surrounding the bottom of the hopper.

In addition, the suction port of the exhaust air blower through which air flows through the lower portion of the fixed amount feeder is located at the uppermost portion of the wall portion of the medicine receiver located at the lower portion of the hopper and at the lower portion of the fixed amount feeder. Have.

Since the upper part of the medicine receiver is maintained at the same level of humidity as the outside air by the action of the exhaust air blower, there is no possibility that the solid matter adheres to the fixed quantity feeder due to the humidity of the dissolved water and the circulating water. Then, the offensive odor that may be generated due to the dissolution of the solid chlorine agent can be discharged in an arbitrary direction through a discharge blower without being discharged from the dissolution tank.

In addition, the inside of the medicine receiver and the dissolution tank has a negative pressure as a result of the intake of the exhaust air blower. The supply of outside air is sucked in from the gap between the portion where the reciprocating slide portion of the fixed-quantity feeder projects from the inside of the upper wall portion of the medicine receiver to the outside and the protruding wall portion. An outside air supply port may be provided on the upper wall of the medicine receiver.

Stir to homogenize the solution in the dissolution tank,
This stirring is carried out by installing a normal stirrer in the dissolving tank, or preferably, by installing a normal circulating pump outside the dissolving tank and mixing the solution by strong stirring by circulation.

In addition, a liquid feed pump is used to return the solution from the dissolution tank to the circulating water.

These dissolving tank circulation pumps or dissolving tank liquid sending pumps may be any of general vortex, diaphragm type, turbine type and the like.

The material of the medicine receiver and the dissolving tank is the same as the material of the above-described feeder, and is preferably a vinyl chloride resin or an acrylic resin.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to FIG. 1, FIG. 2, and FIG.

A pump (4) draws out stored water from a bottom of the water storage tank (3), sends the water to a heat exchanger and / or a filter (5), adjusts the water temperature and / or filters, and forms a circulation system returning to the water storage tank. In FIG. 1, a filter or a heat exchanger (5)
A solution of a solid chlorine agent and a pH adjuster is added to the circulating water returning from the respective dissolution tanks. Water is constantly extracted from the circulating water line (1) to the detection unit (6) to remove residual free chlorine.
The pH is measured, and the detected information is sensed by the controller (17), and the residual chlorine and pH are used as reference values (upper limit or lower limit of the optimum value, and the set value can be changed appropriately) Automatically determine if lower or higher. This determination is repeated at regular intervals (which can be changed appropriately).
If the value is lower than the reference value, the solid chlorinating agent and / or the solid pH adjuster is used for the chlorinating agent quantitative feeder (8).
And / or pH adjuster is supplied to each dissolving tank (12) and / or (11) from the feeder (7). At the same time, the water necessary for dissolving the solid is supplied to the water line (2) by automatically opening and closing the solenoid valve (10) or (9) by the controller.
From 2), it is supplied to the dissolving tank (12) and / or (11) to a certain level. At this time, the solid dropped into the medicine receiver is also dissolved.

In addition, the circulation pump (14) and / or (13) connected to the dissolving tank is operated at the same time as the supply of water to accelerate the dissolution of the drug. The amount to be dissolved at one time can be adjusted arbitrarily and appropriately.

After the homogeneous solution is obtained, the solution is sent to the circulation system by the solution sending pump (16) and / or (15). Normally,
It is preferable to dissolve the chlorine agent and send the solution, then dissolve the pH adjuster and send the solution. However, it is also possible to dissolve and send the solution in reverse or only one of them.

When stopping the automatic control, the stop operation described below is automatically performed by pressing a stop button attached to the control device (17).

This stop operation is performed by supplying the circulating water to the dissolving tanks (11) and (12) to a certain level by opening the solenoid valve (10) or (9), and at the same time, circulating pumps (13) and (14) of the dissolving tank. Also operates to circulate the water in the dissolving tank to dilute the concentrated solution remaining in the dissolving tank, and circulate the water in the dissolving tank by the feed pumps (16) and (15). This means that the liquid is sent to the water line (2).

By repeating this stop operation for a certain period of time (appropriate change is possible), the residual chlorine concentration and / or highly alkaline solution will not remain in the dissolution tank, and the entire system will be safe and automatic. It became.

The control device (17) incorporates a sequence for controlling the above operation.

Next, the operation of the solid medicine supply device will be described in detail.

A signal that requires the addition of a drug and the drive motor (19)
Is started, the rotary motion is converted into horizontal motion by the connecting rods (25) and (26), the reciprocating slide part (20) having the hole (27) is reciprocated, and the medicine falls from the hole (27). . At the same time, the supply water line valve (10) and / or (9) is opened to supply water. When the liquid level in the dissolving tank exceeds a certain level, the dissolving tank circulation pump (14) and / or (13) operates,
Stir the dissolution bath liquid to dissolve the solids.

When the liquid level in the dissolution tank reaches the upper limit, the supply water line valve (10) and / or (9) is closed. When the dissolution is completed, the dissolving tank liquid sending pump (16) and / or (15) operates to send the solution in the dissolving tank. The exhaust air blower (18) is operated at all times, thereby reducing the effect of moisture on the medicine in the metering feeder and eliminating the odor of the solid chlorine agent or its solution.

This feeder converts rotational motion into horizontal motion by connecting rods (25) and (26) connected to the drive motor (19),
Since the moving part in direct contact with the medicine is limited to only the sliding part, parts replacement becomes extremely easy.

As described above, this feeder is a simple (less trouble) device which suppresses moisture absorption, has a quantitative property, and can be applied to solid chemicals other than chlorine agents and pH adjusters.

(Effect of the present invention)

A detector for automatically measuring residual chlorine and pH is installed in the water circulation line of the water storage tank, and a solid chlorine agent and solid
A water feeder having a feeder having a quantitative feeder for a drug such as a pH adjuster, a receiver for the drug, a dissolving tank for rapidly dissolving the drug and sending the solution to a circulation line, and a water reservoir comprising a part for surely controlling each of the above parts. The method of automatically controlling the residual chlorine and the pH makes it possible to keep the water in the water storage tank in an optimum state, and to automatically and safely control the water in a stable state for a long period of time.

[Brief description of the drawings]

FIG. 1 is a schematic view of a system for automatically controlling residual chlorine and pH of stored water. FIG. 2 is an explanatory view showing the relationship between the feeder, the medicine receiver and the medicine dissolving tank, and the sectional view thereof is that of the central part of the apparatus. FIG. 3 shows the relationship between the bottom of the hopper of the feeder and the metering feeder. One of the holes (27-1) is at the bottom of the hopper to receive the medicine, and the lower part of the hole is closed by the pressing part (21). The other hole (27-2) is in a state where the medicine can be dropped because its lower part is not closed by the pressing part (21). (1) Circulating water line (out), (2) Circulating water line (return) (3) Reservoir, (4) Pump for supplying water in reservoir (5) Heat exchanger or filter (6) Free chlorine and pH (7) Location of the pH adjuster quantitative feeder (8) Location of the chlorine agent quantitative feeder (9) (10) Dissolution water line base valve (solenoid valve) (11) pH adjuster dissolution tank, (12) ) Chlorine dissolving tank (13) Circulating pump for pH adjusting agent dissolving tank (14) Circulating pump for chlorine dissolving tank (15) Liquid sending pump for pH adjusting agent dissolving tank (16) Liquid sending pump for chlorine dissolving tank ( 17) Control device, (18) Exhaust air blower (19) Drive motor, (20) Slide unit (21) Holder, (22) Supply water line (23) pH adjuster hopper, (24) Chlorine hopper (25 ), (26), (34) Connecting rod (25), (26), (34) Connecting rod (27) Hole (shown blank in slide) 27-1) Hole when medicine can be received (27-2) Hole when medicine can be dropped (28), (29) Drug receiver (30) Peripheral edge of hopper bottom, (31) Circulating water Discharge part (32) The part where the wall of the hopper connects to the wall of the medicine receiver,
(33) Small holes in the circulating water discharge section

Front page continued (51) Int.Cl. ⁷ identifications FI C02F 1/50 540 C02F 1/50 540C 550 550L 550C 560 560Z 1/66 510 1/66 510G 520 520 530 530Q 540 540G (72) inventor Takiue Takuki 4180 Nagasawa, Fuchu-cho, Geju-gun, Toyama Prefecture (56) References JP-A-3-238085 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C02F 1/76 C02F 1/50 C02F 1/66

Claims (4)

(57) [Claims] 1. A water circulation line system for purifying water from a water storage tank and returning the purified water to the water storage tank; the circulation line system having a detection unit for measuring the concentration of free residual chlorine and the concentration of hydrogen ions; Dissolving tanks for dissolving the chlorinating agent and the solid pH adjusting agent are provided; and the solid chlorine agent and the solid pH adjusting agent are supplied to the respective dissolving tanks above the dissolving tank. Reciprocating slide type having at the bottom of the hopper a vertically penetrating hole for quantifying the solid chlorine agent or the solid pH adjuster at the bottom of the hopper A peripheral portion of a hopper bottom for tightly contacting the plate or rod and closing the hole from above, and supporting and supporting the plate or rod from below, and Reciprocation consisting of holding parts for closing the door from below It has a slide type fixed quantity feeder; and, between the feeder and the dissolving tank, the upper part is a vertical cylinder and the upper part or the lower part is a conical shape narrowing downward, and the dissolving is at the lowermost part. A medicine receiver having an outlet to a tank; and a suction port of an exhaust blower for allowing air to flow through a lower part of the metering feeder, and a lower end of a wall part of the medicine receiver located at a lower part of the hopper. The circulating water is held at an upper portion and a portion below the fixed-quantity feeder; further, the circulating water falls so as to surround a falling point of the solid chlorine agent or the solid pH adjuster that falls on the inclined wall portion of the medicine receiver. A circulating line system having a discharge section comprising a plurality of small holes arranged in a ring so as to perform; a drive for the fixed-quantity feeder according to an instruction from a control device linked to the detection section; Activate the device and The chlorinated water or the solid pH adjuster is dropped from the hole of each quantitative feeder to the drug receiver and / or the dissolution tank, and the circulating water discharged from the circulating water is discharged from the dissolving tank. A method for automatically controlling residual chlorine and pH of stored water, comprising dissolving the solution into a solution and sending the solution to a circulation line. 2. A detector for measuring the concentration of free residual chlorine,
2. The automatic control method according to claim 1, wherein the sensor comprises a noble metal working electrode, a base metal counter electrode, an aqueous electrolyte solution, and an ion-selective diaphragm. 3. The automatic control method according to claim 1, wherein the solid chlorine agent is an isocyanuric acid chlorine agent. 4. The automatic control method according to claim 1, wherein a high-concentration chemical solution does not remain in the dissolution tank when the automatic control is stopped.