Electrolytic ionized water producer of a continuous type

Abstract: The electrolytic ionized water producer is provided with a control circuit (30) which operates at least a polarity reversing relay (21) provided in a circuit for applying a DC voltage to a positive electrode (5) and a negative electrode (4), detects water supply and stop of water supply with a signal from a flow rate sensor (10) and applies a DC voltage to the respective electrodes at a normal connecting positon during water is supplied to produce ionized water, sets a scale removing period of time corresponding to a water supplying period of time in detecting the water supplying period of time with a signal from the flow rate sensor, and applies a DC voltage to the respective electrodes at a reverse connecting position only for the period of time of scale removing operation in every water supplying operation; thus it is made possible to remove scale properly.

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous type electrolytic ionized water producer which continuously produces alkaline ionized water and acid ionized water by electrolyzing city water, and so on, in particular, it relates to a rinse means which automatically removes scale which sticks on electrodes for electrolysis. 2. Description of the Prior Art The body fluid which accounts for 70% of a human body is close to the alkaline water and the alkaline water has a dissolving power for excreting ejecta in the intestines, and the acid water has a sterilizing power. An electrolytic ionized water producer, as a medical substance producer, is known to the public which has made it possible to produce alkaline ionized water and acid ionized water directly from drinking water such as city water, and so on by electrolyzing the water in applying a DC voltage to the positive and the negative electrodes, and the alkaline ionized water promotes the health of the people of the present day in improving their acid constitutions caused by their meat eating habits by drinking the alkaline water, and the acid ionized water is utilized for rinsing the surfaces of bodies as toilet lotion. In an electrolytic ionized water producer, it is necessary to electrolyze water successively in the process of the flow of water, and large sized electrodes are used accordingly, and the impurities of positive ions of calcium, magnesium, and so on contained in the water are deposited on a negative electrode to produce scale. The quantity of the scale increases with the increase in the quantity of water or the period of time, and when the quantity of scale reaches a certain level, the electrolyzing ability is extremely lowered and the electrode itself is to be corroded. In order to remove the scale stuck on the electrodes, the polarity of a negative electrode on which scale is stuck is switched to a positive electrode to dissolve the scale into the water for rinse. According to the above-mentioned phenomenon, an electrolytic ionized water producer of a continuous type is offered in which scale is automatically removed by periodical reversal of polarity and electrolytic operation can be operated continuously. As a conventional electrolytic ionized water producer of a continuous type, there is an example according to a prior art disclosed in Japanese Patent laid open No. 273096/87. The ionized water producer according to the prior art comprises an electrolytic bath with electrodes, a pressure switch which is operated by water pressure generated by supply of water into the electrolytic bath, and a control circuit having a voltage application means for applying a DC voltage with a specified polarity corresponding to the operation of the pressure switch. The control circuit reverses the polarity of the DC voltage to be applied to the electrodes when the integrated period of time of water supply reaches a value which corresponds to a specified quantity of water, and continues the application of the voltage till the pressure switch is made OFF, and after the switch is made OFF the polarity of the voltage is returned to an original polarity. In the case of a conventional apparatus, when scale is to be removed, if the energizing period of time in a reverse polarity is too short, sufficient rinse is not performed, and if the period of time is too long the scale can be stuck on the other electrode causing a reverse effect, so that a specified integrated quantity of water to be supplied is set, and when the quantity of water reaches the set value, even though water is being supplied, the polarity of the applied voltage is reversed for scale removing operation, and water supply is stopped in issuing an alarm to the user; therefore, even when a small quantity of water is needed, the user is requested to perform a complicated operation such as to stop supplying water once and after that to start supplying water again. Since the polarity is automatically reversed during water is being supplied, if the stop of operation is late, acid ionized water generated by the reversal of polarity is mixed into alkaline ionized water. The reverse energizing period of time by the reversal of polarity depends on the period of time till a user stops supplying water, so that it is difficult to secure a fixed period of time for reverse energizing operation; thereby, a trouble can occur caused by the uncertain period of time for reverse energizing operation. There can be another problem that since the ionized water producer is provided with a pressure switch as a means for integrating the quantity of water, and an alarm means, and so on the constitution can be a complicated one. SUMMARY OF THE INVENTION It Is therefore an object of the present invention to provide an ionized water producer in which a complicated operation is not needed, there is no fear of obtaining unnecessary ionized water at the reversal of polarity and the operability of obtaining ionized water is upgraded, and in every operation of supplying water, scale is properly removed to secure a high electrolyzing ability for a long period of time. In order to achieve the above-mentioned object, an ionized water producer according to the present invention comprises a water supply detection means provided along a pipeline for supplying water to an electrolytic bath having a positive electrode and a negative electrode, and a control circuit which operates at least a relay for reversing the DC voltage polarity to be applied to the negative electrode and the positive electrode. The control circuit comprises a means for detecting water supply or stop of water supply with a signal from the water supply detection means, and for applying a DC voltage to the positive electrode and the negative electrode at a normal connecting position during water is supplied, and a means for setting a scale removing period of time corresponding to a water supplying period of time in detecting the water supplying period of time with a signal from the water supply detection means, and also for applying a DC voltage to the positive electrode and the negative electrode at a reverse connecting position only for the period of time of scale removing operation in every water supplying operation. In the constitution as mentioned in the above, when water is supplied to the electrolytic bath, the water supply is detected in the control circuit with a signal from a flow rate sensor, and a DC voltage is applied to the positive electrode and the negative electrode at a normal connecting position, and ionized water is produced. At this time in the control circuit, a water supplying period of time is detected with a signal from the flow rate sensor and corresponding to the detected water supplying period of time, the period of time for removing scale is set; in every operation of supplying water, only for the set period of time for removing scale, a DC voltage is applied to the positive electrode and the negative electrode at a reverse connecting position; thus scale can be removed properly in every water supplying operation. BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawing wherein: Fig. 1 is a constitutional representation showing the outline of the whole system of an embodiment of a continuous type electrolytic ionized water producer according to the present invention; Fig. 2 is a block diagram showing a control system of an embodiment of a continuous type electrolytic ionized water producer according to the present invention; and Fig. 3 is a chart showing the time chart of the operation of ionized water production and the scale removing operation. DETAILED DESCRIPTION OF PREFERRED EMBODIMENT An embodiment according to the present invention will be explained based on the drawings in the following. The outline of the whole constitution of a continuous type electrolytic ionized water producer will be explained based on Fig. 1. In the figure, 1 is an inlet pipe for introducing drinking water being connected to a city water piping, and so on, and the inlet pipe 1 is connected to an electrolytic bath 2. The electrolytic bath 2 is of a closed type, and the outlet side inside the bath is partitioned into 2 rooms, 2a and 2b, with a partition 3, and in each room a negative electrode 4 or a positive electrode 5 is installed; a discharge pipe 6 for alkaline ionized water is provided in the room 2a having the negative electrode 4, and a discharge pipe 7 for acid ionized water is provided in the room 2b having the positive electrode 5. Each of these discharge tubes, 6 and 7, is provided with a faucet, 8 or 9, which makes it possible to take in alkaline ionized water or acid ionized water separately. The inlet pipe 1 is provided with a flow rate sensor 10 for detecting water supply or water supplying period of time of alkaline ionized water or acid ionized water. The flow rate sensor 10 has a constitution in which, for example, the rotation of impellers fixed with magnet pieces is detected with a hole element, and the pulse signal is processed electrically for detecting the water supply and the water supplying period of time. An electric control system for applying a voltage will be explained in the following. A symbol 15 is an AC power source, and it is connected to the primary side of a transformer 18 through a power switch 16, which is made ON or OFF with an output signal of a control circuit 30, and a fuse 17, and the secondary side of the transformer 18 is connected to a rectifier circuit 19. A positive electrode and a negative electrode on the DC voltage output side of the rectifier circuit 19 are connected to 2 movable contacts, 22a and 23a, of a relay 21 for reversing polarity through a smoothing capacitor 20. A fixed contact 22b out of 2 fixed contacts, 22b and 22c, of the movable contact 22a of the positive electrode is connected to the positive electrode 5, and the other fixed contact 22c is connected to the negative electrode 4; a fixed contact 23b out of 2 fixed contacts, 23b and 23c, of the movable contact 23a of the negative electrode is connected to the negative electrode 4 and the other fixed contact 23c is connected to the positive electrode 5. These 2 movable contacts, 22a and 23a, are, in normal time, in the normal connecting positions being abutted on the fixed contacts, 22b and 23b, on a side shown in a drawing, with a force of a spring, and they are switched to the reverse connecting positions being abutted on the other fixed contacts, 22c and 23c, by a reversing signal from the control circuit 30. The control system of the control circuit 30 will be explained based on Fig. 2. The control circuit 30 comprises a water supply detection means 31, a stop of water supply detection means 32 and an integration means for integrating water supplying period of time 34, to which a signal from the flow rate sensor 10 is to be input. The water supply detection means 31 detects water supply when a signal from the flow rate sensor 10 is input continuously for a fixed time, and the stop of water supply detection means 32 detects stop of water supply when a signal from the flow rate sensor 10 is stopped inputting continuously for a fixed time. These detection signals of water supply and stop of water supply are input to a power supply driving means 33 and it outputs a signal for making the power supply switch 16 ON during the water supply. An integration means for integrating water supplying period of time 34 sets the memory of water supply integrated quantity, only for the period of time from the input of a water supply detection signal till the input of a stop of water supply detection signal, and counts the number of pulses in the signal from the flow rate sensor 10, and a water supplying period of time, T, corresponding to the water supply quantity in every water supplying operation is integrated and stored. A signal of the water supplying period of time, T, is input to a setting means for setting a scale removing period of time 35 right after a stop of water supply, and a scale removing period of time, D, is set corresponding to the water supplying period of time, T. When the water supplying period of time, T, is long, much scale is produced, and the scale removing time, D, becomes long, so that the scale removing time, D, for every water supplying operation is set to be optimum beforehand, approximately in the form of a growth function, for the water supplying period of time, T, and the scale removing period of time, D, is set retrieving the setting map. A signal of the scale removing period of time, D, is input to a reverse driving means 36 and it outputs a reversing signal only for the period of time, D, to the polarity reversing relay 21 for switching the connection to a reverse connecting position. A signal of scale removing period of time, D, is also input to the power supply driving means 33, and only for the period of time, D, it outputs an ON signal to the power supply switch 16. The above-mentioned reversing signal is input to a judgment means for judging the finish of a scale removal operation 37, and when the reversing signal is stopped inputting continuously for a specified period of time, it judges the finish of scale removing operation, and a finishing signal is input to the water supplying period of time integration means 34 and the memory is reset. On the other hand, as a measure for the case where water is supplied during a scale removing operation, the control circuit 30 comprises a detection means for detecting water supply during a scale removing operation 38 to which a water supply detection signal from the water supply detection means 31 and a reversing signal from the judgment means for judging the finish of a scale removing operation 37 are input, and if a water supply detection signal is input during a period of time in which a reversing signal is being output, a signal of water supply during a scale removing operation is detected. A signal from the water supply detection means during a scale removing operation 38 is input to the reverse driving means 36 to stop the output of a reversing signal, and at the same time the signal is input to the water supplying period of time integration means 34 to reset the memory. Next, the operation of the embodiment will be explained using the time chart shown in Fig. 3. Drinking water is always introduced from the city water supply, and so on to the electrolytic bath 2 through an inlet pipe 1, and a signal from the flow rate sensor 10 is not input to the control circuit 30 in a state where the faucets, 8 and 9, fixed to the discharge pipes, 6 and 7, of alkaline ionized water and acid ionized water are closed, that is, in an unused state. Therefore, the polarity reversing relay 21 is at a normal connecting position, however, the power switch 16 is in a state of OFF, so that power is not supplied and electrolysis is not performed. When the faucet 8 of the discharge pipe 6 is opened, for example, water is supplied from the inlet pipe 1 to the electrolytic bath 2 and a pulse signal from the flow rate sensor 10 is input to the control circuit 30, and water supply is detected with the water supply detection means 31, and the power supply switch 16 is made ON by a power supply driving means 33. Then the output voltage of an AC power supply 15 is applied to the primary side of a transformer 18 and the secondary output voltage is rectified to a DC voltage by a rectifier circuit 19 and the DC voltage is smoothed with a smoothing capacitor 20, and the specified DC voltage, Vc, is in a ready state. At this time, since the polarity reversing relay 21 is at the normal connecting position, the positive electrode of the DC voltage, Vc, is connected to the positive electrode 5 and the negative electrode of the DC voltage, Vc, is connected to the negative electrode 4, that is, the voltage is applied in a normal way, and the drinking water in the electrolytic bath 2 is electrolyzed. On the side of the positive electrode 5 acid ionized water containing many negative ions is obtained and on the side of the negative electrode 4 alkaline ionized water containing many positive ions is obtained, and the alkaline ionized water is obtained at the faucet 8. After that, when the faucet 8 is closed, water supply is stopped and the signal from the flow rate sensor 10 is stopped accordingly, and the stop of water supply is detected by the stop of water supply detection means 32, and the power supply switch 16 is made OFF to stop the production of ionized water by electrolysis. When the electrolysis of water supplied at a time is performed, the water supply period of time, T₁, is integrated by the water supplying period of time integration means 34 as shown in Fig. 3, and an optimum scale removing time, D₁, is set corresponding to the water supplying period of time, T₁, by a scale removing period of time setting means 35. A reversing signal is output from a reverse driving means 36 to the polarity reversing relay 21 only for the scale removing period of time, D₁, to change the connection from a normal connecting position to a reverse connecting position, and at the same time, the power supply switch 16 is made ON again for supplying power. In this case, electrolysis is performed in a state of reverse power supply in which the negative electrode of the DC voltage, Vc, is connected to the positive electrode 5 and the positive electrode of the DC voltage, Vc, is connected to the negative electrode 4; thereby, the scale which sticks on the positive electrode 5 and the negative electrode 4 is dissolved into water and removed properly in the supply of water at a time. When the scale removing operation is judged to have finished by the judgment means for judging the finish of a scale removing operation 37, the integrating operation by the integration means for integrating water supplying period of time 34 is reset for the preparation of the next integrating operation. In this case, if the water supplying period of time, T, is so small as T₂ as shown in Fig. 3, the scale removing period of time, D, also becomes so small as D₂; in this way, scale is automatically removed corresponding to the adhesive condition of the scale, utilizing a vacant time right after every water supplying operation. In order to make scale removing operation possible during water is not being supplied, the constitution of a water supply path has a function to keep water inside the electrolytic bath 2 for more than a fixed period of time after the supply of water is stopped. In the scale removing period of time, D, the supply of water is detected by the detection means for detecting the water supply during a scale removing operation 38. When water is supplied in the way of scale removing period of time, D₁ as shown with a one-dot chain line in Fig. 3, the integration means for integrating water supply period of time 34 is reset and a new integration of water supplying period of time, T, is started, the output of a reversing signal is stopped and the polarity reversing relay 21 is returned to a normal connecting position, and electrolysis is performed normally to produce ionized water. The desired ionized water of a user can be obtained immediately without waiting. In this case, originally, the scale removing period of time, D, is decreased from D₁ to D₃ and the scale removing operation can be insufficient, however, there occurs no problem because the scale can be dissolved in the following scale removing operations. As described in the above, the explanation about the embodiment according to the present invention is given, however, the present invention is not limited to the embodiment. For example, the polarity reversing relay 21 can be arranged to perform ON/OFF operation besides the switching of normal/reverse connecting positions, or a switch besides the power switch 16 can be added. A constitution, for example, is also possible in which an alarm is given during a scale removing operation and water supply is allowed only after the removal of scale.

Claims: An electrolytic ionized water producer of a continuous type comprising: a water supply detection means provided along a water supply pipeline being connected to an electrolytic bath having a positive electrode and a negative electrode; and a control circuit for operating at least a polarity reversing relay provided in a circuit for applying a DC voltage to the positive electrode and the negative electrode; said control circuit comprising: a means for detecting water supply and stop of water supply and for applying a DC voltage to the positive electrode and the negative electrode during water is supplied; a means for setting a scale removing period of time corresponding to a water supplying period of time, in detecting the water supplying period of time by a signal from the water supply detection means, and for applying a DC voltage to the positive electrode and the negative electrode at a, reverse connecting position only for the scale removing period of time in each water supplying operation. An electrolytic ionized water producer of a continuous type as claimed in claim 1 comprising said control circuit having a means for releasing a scale removing operation at a detection of water supply during the scale removing operation and for resuming integrating operation of a water supplying period of time. An electrolytic ionized water producer of a continuous type as claimed in claim 1 wherein said control circuit outputs a signal for switching the connection of a polarity reversing relay from a normal connecting position to a reverse connecting position when a scale removing operation is started, and makes a power switch ON during a water supplying operation and a scale removing operation.

Inventors: ABE SHINJI JUNEPARESU-SAGAMIHA, ARAI KAZUYOSHI, MIYAMAE KAZUHIRO, ABE, SHINJI, JUNEPARESU-SAGAMIHARA ROOM NO. 101, ARAI, KAZUYOSHI, MIYAMAE, KAZUHIRO
Applicants: MIZ CO LTD, MIZ CO., LTD.
Application year: 1992
Main classification: C02F1
IPC codes: C02F1