JP3642409B2 - Water quality maintenance device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water quality maintenance device for maintaining the free residual chlorine concentration of tap water stored in a water storage tank such as a building or a condominium.
[0002]
[Prior art]
In general, in buildings and condominiums, tap water received in a water receiving tank on the ground is pumped up to a water storage tank (elevated water tank), and water is supplied from the water storage tank to each faucet. On the other hand, in the Water Supply Law, the free residual chlorine concentration at the tap is set to 0.1 mg / l or more, but in order to maintain safe water quality, a free residual chlorine concentration of 0.3 to 0.5 mg / l is required. It is said that.
[0003]
[Problems to be solved by the invention]
However, the elevated water tank is an open-type tank, and when the residence time of tap water becomes longer, chlorine is released and germs are likely to propagate. In particular, the concentration of free residual chlorine is significantly reduced when exposed to a lot of ultraviolet rays at high temperatures, such as in summer, or when the number of residents is reduced due to homecoming, etc. . This reduction in free residual chlorine concentration is an important problem that directly leads to deterioration of water quality.
Accordingly, an object of the present invention is to compensate for the decrease in the free residual chlorine concentration of tap water in the water tank and to maintain the effective free residual chlorine concentration within a certain range at all times.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention aims to maintain the water quality of the water storage tank by generating chlorine using chlorine ions contained in tap water. That is, the water quality maintenance device of the present invention includes an electrolytic tank that electrolyzes tap water containing chlorine ions to generate chlorine, a circulation pump that circulates the tap water stored in the water storage tank through the electrolytic tank, and a circulation line. When, and control means for activating the electrolytic cell and the circulation pump at a preset time or time interval, while maintaining free residual chlorine concentration of tap water stored in the water tank within a predetermined range
In that case, the said control means shall start the said electrolysis tank after progress for the preset time after starting the said circulation pump (Claim 1). Thereby, stable electrolysis can be started after the flow rate and water temperature of the circulating water are stabilized.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a system configuration diagram of a water quality maintenance device showing an embodiment of the present invention, and FIG. 2 is a control block diagram of the device of FIG. 3 shows the electrolytic cell in FIG. 1, (A) is a plan view with a part broken away, and (B) is a sectional view taken along the line BB. First, in FIG. 1, 1 is a water storage tank installed on the rooftop of a building, and tap water pushed up by a pump (not shown) from a water receiving tank (not shown) installed on the ground is stored. The tap water in the water tank 1 is supplied to each faucet from the water outlet 2, and when the water level drops to the lower limit level, the pump is activated by a signal from a water level sensor (not shown), and the tap water in the water receiving tank is supplied from the water inlet 3. Replenished to the upper limit level. Although the tap water in the water tank 1 is sterilized with chlorine, as described above, the chlorine gradually disappears with the passage of the residence time, and various germs easily propagate.
[0006]
On the other hand, a water quality maintenance device 4 is installed along with the water storage tank 1, and the tap water in the water storage tank 1 is circulated through the water quality maintenance device 4 to maintain the free residual chlorine concentration. The water quality maintenance device 4 circulates in the box-shaped main body through the electrolytic bath 5 through an electrolytic bath 5 that electrolyzes tap water containing chlorine ions to generate chlorine, and the tap water stored in the water reservoir 1. A pump 6 and a circulation line 7 and a control unit 8 that activates the electrolytic cell 5 and the circulation pump 6 at a preset time are installed. In the circulation line 7, a water leakage detection valve 9 is inserted in front of the circulation pump 6 to block the line when water leakage occurs. Further, in the main body, an anti-freeze heater 10, a circulation fan 11 for circulating air through the anti-freeze heater 10, an air temperature sensor 12 for detecting the air temperature in the machine, an exhaust fan 13 for discharging the air in the machine, A water leak detector 14 for detecting water leak from a water pool on the floor of the machine is installed. Four electrolytic tanks 5 are installed for adjusting the electrolytic capacity, two of them are connected in series, and further, they are connected in parallel.
[0007]
The structure of the electrolytic cell 5 will be described with reference to FIG. In addition, the fracture | rupture part of FIG. 3 (A) has shown the state except the case 15 and the anode 19 of the upper electrode 7 in FIG. 3 (B). In the electrolytic cell 5, two sets of electrodes 17 are arranged on both sides of the partition plate 18 in a container made of a mold resin divided into a case 15 and a cover 16. Each electrode 17 is composed of two positive and negative electrode plates 19 and 20, and these electrode plates 19 and 20 are arranged opposite to each other with a frame-like spacer 21 made of a thin resin film interposed therebetween. Each terminal 22 is joined. At the left end of the electrolytic cell container in FIG. 3, a single water inlet 23 having one end closed so as to straddle the two sets of electrodes 17 is provided. In addition, two drainage channels 24 for each electrode are provided at the right end, and one end thereof is closed on the side opposite to the inlet channel 23. As shown in FIG. 3A, a pipe joint 25 is attached to the opening end of the water inlet 23, and a pipe joint 26 straddling the two water outlets 24 is attached to the opening end of the water outlet 24. .
[0008]
In such an electrolytic cell 5, when a direct current voltage of the illustrated polarity is applied to each of the electrode plates 19 and 20 of the two sets of electrodes 17 via the terminals 22 and tap water is supplied from the water inlet 23, the tap water is Electrolysis is performed while passing through the electrode, and chlorine ions in tap water are converted into chlorine by a reaction of 2Cl ⁻ → Cl ₂ + 2e ^{− at} the anode. The tap water containing chlorine is collected in the water discharge channel 24 for each electrode as shown by the arrows in the drawing, and further mixed by the pipe joint 26 and guided to a hose (not shown) constituting the circulation pipeline 7.
[0009]
Here, the average residence time of tap water in the water tank 1 is estimated from the water storage capacity of the water tank 1 and the predicted amount of water used per unit time. Moreover, the decrease characteristic of the free residual chlorine concentration by the residence time of tap water is known from actual measurement. Therefore, the required amount of chlorine generated per day (mg / day) is estimated from these average residence time, reduction characteristics, free residual chlorine concentration of raw water, target chlorine concentration level, and the water storage capacity of the water tank 1. The On the other hand, the chlorine generation amount (mg / min) per unit time in the electrolytic cell 5 is estimated from the water quality inspection (average water temperature, chlorine ion concentration, electrical conductivity, etc.) of the raw water. Accordingly, the daily operation time (minute) is calculated from the necessary chlorine amount (mg / day) and the chlorine generation amount (mg / minute), and further, the number of daily operation (operation time) and 1 time. The driving time per minute (min) is determined.
[0010]
The operation time (for example, 6 times of 0:00, 4, 8:00, 12:00, 16:00, and 20:00) and the operation time (for example, 20 minutes) are set from the keyboard 27 to the control unit 8 (FIG. 2). Is preset and input. Therefore, in FIG. 2, the control unit 8 activates the circulation pump 6 at a predetermined time to circulate the tap water in the water storage tank 1 through the electrolysis tank 5, and then switches the polarity from the power source 28 after 75 seconds, for example. A DC voltage is applied to the electrolytic cell 5 via the relay 29. The operation of the electrolytic cell 5 and the circulation pump 6 can be performed at a constant time interval, for example, a 4-hour interval after the initial operation. As a result, chlorine ions in the tap water passing through the electrolytic cell 5 are converted to chlorine, and the chlorine-rich tap water is returned to the water tank 1 and lost in the water in the water tank 1 due to the retention. Is replenished. And when predetermined time passes, the operation of the electrolytic cell 5 and the circulation pump 6 is stopped. By repeating this, the free residual chlorine concentration of the tap water in the water tank 1 is maintained within an appropriate range, for example, around 0.5 mg / l.
[0011]
The control unit 8 also monitors the air temperature in the machine by the air temperature sensor 12, and when the air temperature falls to a certain value, the control unit 8 energizes the anti-freezing heater 10 and activates the circulation fan 11 to circulate the warm air. While preventing the freezing of each part, when the air temperature rises to a certain value, the exhaust fan 13 is activated to discharge the in-machine air and introduce the outside air to prevent condensation in the machine and to cool it. Further, when water leakage is detected by the water leakage detector 14, the water leakage detection valve 9 is closed to stop the leakage of water into the machine.
[0012]
【The invention's effect】
As described above, according to the present invention, it is possible to automatically maintain the free residual chlorine of the stored water in the water tank at a concentration necessary for the disinfection effect, and to provide water that can always be relieved by suppressing the generation of germs. . In addition, since chlorine ions contained in tap water are used and no chemicals are used, maintenance and management are easy.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of a water quality maintenance device showing an embodiment of the present invention.
FIG. 2 is a control block diagram of the apparatus of FIG.
3 shows the electrolytic cell in FIG. 1, (A) is a plan view, and (B) is a sectional view taken along the line BB. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water storage tank 4 Water quality maintenance apparatus 5 Electrolysis tank 6 Circulation pump 7 Circulation line 17 Electrode 18 Partition plate 19 Electrode plate 20 Electrode plate 21 Spacer 22 Terminal 23 Inlet channel 24 Outlet channel 28 Power supply

Claims (1)

An electrolyzer that electrolyzes tap water containing chlorine ions to generate chlorine, a circulation pump and a circulation line that circulates the tap water stored in the water tank through the electrolyzer, and a preset time or time interval And control means for starting up the electrolytic cell and the circulation pump, and maintaining the free residual chlorine concentration of tap water stored in the water storage tank within a certain range , at which time the control means starts up the circulation pump The water quality maintenance device is characterized in that the electrolytic cell is started after a preset time has elapsed .

Images