JP2006325699A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fully safe washing machine provided with a function of adding metal ions to water in a water supply route by electrolysis. <P>SOLUTION: The washing machine comprises: a lid 2 covering a laundry feeding port; a plurality of electrodes inside an ion elution unit 19 provided in the water supply route 8; and a voltage application circuit provided inside a controller 16 for applying voltage between the electrodes. The metal ions are eluted from the electrode which is an anode by applying the voltage between the electrodes in the state that water is interposed between the electrodes. When the lid 2 is open, the voltage application circuit does not apply the voltage between the electrodes. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a washing machine, and more particularly to a washing machine having a function of adding metal ions to water in a water supply path by electrolysis.

  There has been proposed a washing machine having a function of antibacterial treatment of laundry every time it is washed. For example, in Patent Document 1, a plurality of metal electrodes are provided in a water supply path, and a voltage is applied between the metal electrodes to elute antibacterial metal ions into water supplied into the washing tub, thereby washing the laundry. A washing machine for antibacterial treatment is disclosed.

  As a voltage application circuit for applying a voltage to a plurality of metal electrodes provided in a water supply path, for example, an AC voltage supplied from a commercial power supply (AC100V) is stepped down by a step-down transformer, and the stepped-down AC voltage is rectified. Generally, a circuit that smoothes a DC voltage and applies this DC voltage between metal electrodes by turning on a switching element such as a transistor is common.

When water is flowing through the water supply path, the metal electrode and the water supplied to the washing tub are electrically connected, so if the user touches the water in the water supply, the metal electrode It becomes the state equivalent to touching. Therefore, a configuration in which the primary side (commercial power supply side) and the secondary side (metal electrode side) of the step-down transformer are insulated, and a configuration in which the voltage applied between the metal electrodes by the step-down transformer is lower than the voltage of the commercial power supply. Etc. are employed to avoid the possibility of electric shock by the user.
JP 2004-173717 A

  However, in the conventional washing machine having the above-described general voltage application circuit, when the step-down transformer is damaged for some reason and the primary side and the secondary side of the step-down transformer are no longer insulated, the commercial power source is connected between the metal electrodes. There is a possibility that a voltage of 2 is applied. In addition, when a component in the voltage application circuit fails for some reason and the voltage applied between the metal electrodes cannot be normally controlled, a relatively high voltage may be applied between the metal electrodes. And in a state as mentioned above, when a user touches the water in water supply, a user will be electrocuted.

  An object of this invention is to provide the washing machine which has the function to add a metal ion to the water of a water supply path | route by electrolysis, and was rich in safety in view of said problem.

  In order to achieve the above object, a washing machine according to the present invention includes a lid that covers a laundry inlet, a plurality of electrodes provided in a water supply path, and a voltage application circuit that applies a voltage between the electrodes, A washing machine that elutes metal ions from an electrode serving as an anode by applying a voltage between the electrodes in a state where water is interposed between the electrodes, and when the lid is open, the voltage application circuit A voltage is not applied between the electrodes.

  According to such a structure, a metal ion can be added to the water of a water supply path | route by electrolysis. In addition, according to such a configuration, since no voltage is applied between the electrodes when the lid is opened, there is no possibility that the user may be electrocuted when the user touches the water in the water supply, and safety is ensured. Will improve.

  In the washing machine configured as described above, when the lid is opened in a state where the elution process of the metal ions has not been completed, water supply to the water supply path may be stopped. Thereby, in the state where the elution process of the metal ions is not completed, there is no possibility that the user touches the water that is electrically connected to the electrode, so that the safety is further improved. In addition, since it is possible to prevent water from being supplied when the elution of the metal ions is temporarily stopped as the lid is opened, the concentration of the metal ions in the washing tub can be reduced. It can be set as set value.

  Further, the washing machine having each of the above-described configurations further includes a lid locking unit that locks the lid when the lid is closed, and the lid is locked while the lid is closed by the lid locking unit during the elution process of the metal ions. You may make it do. Accordingly, the lid is not opened during the elution process of the metal ions, and the user cannot touch the water in the water supply, so that safety is further improved.

  Moreover, in the washing machine having each of the above configurations, a switching unit may be provided between the voltage application circuit and the electrode. Thereby, the voltage applying circuit can be prevented from applying a voltage between the electrodes by turning off the switching means.

  The switching means may be a switch that opens and closes a contact mechanically linked to the opening and closing of the lid. As a result, even if a failure occurs in the electrical system (for example, failure of the lid open / close detection device that outputs an electrical signal corresponding to the opening / closing of the lid), the voltage application circuit is connected between the electrodes when the lid is open. It is possible to prevent voltage from being applied to.

  According to the present invention, it is possible to realize a washing machine that has a function of adding metal ions to water in a water supply path by electrolysis and has high safety.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic vertical sectional view of a washing machine according to the present embodiment.

  The washing machine shown in FIG. 1 includes a washing machine body 1 that is a box having an upper surface opened. The lid 2 is coupled to the washing machine main body 1 by a hinge portion and rotates in a vertical plane. The lid 2 covers the upper surface opening of the washing machine body 1 in the closed state.

  Inside the washing machine body 1, a water tub 3 and a washing tub 5 also serving as a dewatering tub are disposed. Both the water tub 3 and the washing tub 5 have a cylindrical cup shape with an open top surface, and are arranged concentrically with the axis line vertical, the water tub 3 being the outside, and the washing tub 5 being the inside. The water tank 3 is elastically supported by a vibration isolation mechanism 4. The washing tub 5 has a plurality of drain holes 6 arranged in an annular shape at the top. A pulsator 7 for causing the washing water or the rinsing water to flow in the tub is disposed on the inner bottom surface of the washing tub 5.

  The lid opening / closing detection device that detects opening / closing of the lid 2 includes a magnet 17a attached to the lid 2 and a reed switch 17b that is operated by the magnetic force of the magnet 17a.

  The lid lock mechanism includes a recess 18b provided in the lid 2 and a projection 18a provided in the washing machine main body 1. The projection 18a is inserted into the recess 18b and controlled by a load drive circuit 25 described later. The lid 2 can be locked by holding the state where the convex portion 18a is inserted into the concave portion 18b so that the convex portion 18a does not slide in the horizontal direction.

  The water supply path 8 is arranged in the upper part in the washing machine body 1. The starting end of the water supply path 8 is connected to a water tap or the like (not shown) via a water supply hose (not shown), and the end of the water supply path 8 is provided at a position facing the inside of the washing tub 5. The water supply path 8 is provided with a water supply valve 9 and an ion elution unit 19 in order from the start end side. When the water supply valve 9 is in the open state, water passes through the water supply path 8 and washing water or rinsing water is supplied to the washing tub 5.

  A drain hose 10 for draining the water in the water tub 3 and the washing tub 5 to the outside of the washing machine body 1 is attached to the bottom of the water tub 3. Water flows into the drain hose 10 from drain pipes 12a and 12b. The drain pipe 12 a is connected to a location near the outer periphery of the bottom surface of the water tank 3, and the drain pipe 12 b is connected to a location from the center of the bottom surface of the water tank 3. A drain valve 11 is provided in the drain pipe 12b. In addition, an air trap is provided at a location on the upstream side of the drain valve 11 of the drain pipe 12b, and the pressure guiding pipe 13 extends from the air trap. A water level sensor 14 is connected to the upper end of the pressure guiding tube 13, and the water level in the washing tub 3 is transmitted as pressure to the water level sensor 14 via the pressure guiding pipe 13. The upper end of the drain pipe 12 b communicates with the inside of the washing tub 5 through a drainage space formed independently between the water tub 3 and the washing tub 5 and a drainage port formed at the bottom of the washing tub 5. Therefore, when the drain valve 11 is in the open state, the water in the washing tub 5 is drained through the drain channel 12b and the drain hose 10.

  A drive mechanism 20 that drives the pulsator 7 and the washing tub 5 is provided on the lower surface of the water tub 3. The drive mechanism 20 includes a clutch that switches whether the power of the washing motor 21 is transmitted only to the pulsator 7 or to both the pulsator 7 and the washing tub 5. The drive mechanism 20 rotates only the pulsator 7 in one direction or both directions mainly during the washing operation and the rinsing operation, and rotates the washing tub 5 and the pulsator 7 together in one direction during the dehydration operation.

  In addition, an operation display device 15 for displaying input of driving course selection, driving start / stop, etc., driving status, driving course selection contents, and the like is arranged on the upper surface of the washing machine body 1 and controls the overall equipment. A control device 16 having (hereinafter referred to as a microcomputer) is disposed inside the front side of the washing machine body 1.

  Next, a structural example of the ion elution unit 19 will be described. A horizontal sectional view of the ion elution unit is shown in FIG. 2, and a perspective view of the electrode is shown in FIG.

  The ion elution unit 19 has a case 19a. The case 19a includes a water inlet 19b at one end in the longitudinal direction and a water outlet 19c at the other end.

  The ion elution unit 19 has two electrodes 19d and 19e in a case 19a. Inside the case 19a, two plate-like electrodes 19d and 19e are arranged facing each other along the water flow from the inlet 19b to the outlet 19c.

  When a predetermined voltage is applied between the electrodes 19d and 19e in the presence of water in the case 19a, metal ions of the electrode constituent metal are eluted from the electrode serving as the anode. For example, the electrodes 19d and 19e may be silver plates having a size of about 20 mm × 50 mm and a thickness of about 1 mm, and may be arranged at a distance of about 5 mm by the electrode holding members 19f and 19g. The electrode 19d and the connection terminal 19h, and the electrode 19e and the connection terminal 19i are the same metal material and are integrally formed.

  Next, the electrical configuration of the washing machine according to the present embodiment will be described with reference to FIG. FIG. 4 is a diagram illustrating an electrical configuration example of the washing machine according to the present embodiment. In FIG. 4, the same parts as those in FIG.

  The control device 16 includes a microcomputer 22, a power supply circuit 24, a load drive circuit 25, an ion control circuit 26, a primary winding 27 a of a step-down transformer, and a drive circuit 38. It is driven by a voltage supplied from an AC power supply 23 which is a commercial power supply supplied from a power line.

  The microcomputer 22 starts its operation when a voltage is supplied from the power supply circuit 24, and performs various controls according to a stored program. The microcomputer 22 is connected to the operation display device 15, the lid open / close detection device 17, the water level sensor 14, the ion control circuit 26, and the load drive circuit 25, and the operation display device 15, the lid open / close detection device 17, and the water level sensor 14. Are input in accordance with a program stored in advance, and control signals are output to the load drive circuit 25, the operation display device 15, and the ion control circuit 26 based on the processing results. Then, a series of steps in the washing machine is executed. The power supply circuit 24 converts the AC voltage supplied from the AC power supply 23 into a DC voltage suitable for each of the microcomputer 22 and the load drive circuit 25 and supplies the DC voltage to each circuit. The load drive circuit 25 drives the washing motor 21, the drive mechanism 20, the drain valve 11, the water supply valve 9, the lid lock mechanism 18, and the like. The ion control circuit 26 controls a drive circuit 38 that applies a voltage between the electrodes 19d and 19e of the ion elution unit.

  The drive circuit 38 includes a secondary winding 27b of a step-down transformer, a rectifier circuit 28, a constant voltage circuit 29, a constant current circuit 30, a current detection circuit 31, a photocoupler 33, a photocoupler 34, and a photocoupler. 37, a transistor 35 having a resistance between the base and the base / emitter, and a transistor 36 having a resistance between the base and the base / emitter.

  The AC voltage output from the AC power source 23 is stepped down to a predetermined AC voltage by a step-down transformer composed of a primary winding 27a and a secondary winding 27b, rectified by a rectifier circuit 28, and converted to a constant voltage by a constant voltage circuit 29. Then, it is sent to the constant current circuit 30.

  The constant current circuit 30 operates so as to change the output voltage corresponding to the change in the resistance value between the electrodes 19d and 19e and to always supply a constant current between the electrodes 19d and 19e. The current detection circuit 31 detects the output current of the constant current circuit 30. If the detected current is less than the specified value, the current detection circuit 31 outputs a signal to the ion control circuit 26 via the photocoupler 37, and the ion control circuit 26 controls the drive circuit 38 so that no voltage is applied between the electrodes 19d and 19e when the signal is input.

  Photocouplers 33 and 34 and transistors 35 and 36 are provided between the current detection circuit 31 and the electrodes 19d and 19e.

  Under the control of the ion control circuit 26, when both the phototransistor of the photocoupler 33 and the phototransistor of the photocoupler 34 are OFF, no voltage is applied between the electrodes 19d and 19e.

  Under the control of the ion control circuit 26, when the phototransistor of the photocoupler 33 is ON and the phototransistor of the photocoupler 34 is OFF, a voltage is applied to the base of the transistor 36, and the transistor 36 is turned ON. In such a state, the electrode 19e becomes an anode, the electrode 19d becomes a cathode, a voltage is applied between the electrodes 19d and 19e, and water exists between the electrodes 19d and 19e. Current flows through the water present in between. Conversely, when the phototransistor of the photocoupler 33 is OFF and the phototransistor of the photocoupler 34 is ON under the control of the ion control circuit 26, a voltage is applied to the base of the transistor 35, and the transistor 35 is turned ON. In such a state, the electrode 19d becomes an anode, the electrode 19e becomes a cathode, a voltage is applied between the electrodes 19d and 19e, and water exists between the electrodes 19d and 19e. Current flows through the water present in between.

  When a unidirectional current is passed between the electrodes 19d and 19e for a long time, only one of the electrodes on the anode side is depleted, and impurities such as calcium in water are fixed as scale on the electrode on the cathode side. To do. Further, chlorides and sulfides of the component metals of the electrode are generated on the electrode surface. Since these phenomena cause a decrease in the elution performance of metal ions, the microcomputer 22 controls the drive circuit 38 via the ion control circuit 26 so as to periodically reverse the direction of current flow.

  Note that the primary winding 27a and the secondary winding 27b of the step-down transformer are electrically completely insulated, and the light-emitting diode side and the phototransistor side of the photocouplers 33, 34, and 37 are completely electrically connected. Is insulated. Therefore, the AC power source 23 which is a commercial power source supplied from the power line and the electrodes 19d and 19e are electrically insulated. In addition, since the electrodes 19d and 19e are electrically connected to the water in the water supply that may be touched by the person through the water in the water supply path 8, the voltage applied between the electrodes 19d and 19e is a constant voltage circuit. 29 limits its maximum value. As a result, as long as the control device 16 does not break down, only a low voltage of about 40 V or less, which is considered safe for the human body, is applied between the electrodes 19d and 19e.

  Next, an operation example of the washing machine according to the present embodiment will be described with reference to the flowchart of FIG. If the microcomputer 22 determines that the next process to be performed is a water supply process for eluting metal ions (ion water supply process) according to a program stored in advance, the microcomputer 22 starts the ion water supply process. The ion water supply step is a step of supplying water from which metal ions are eluted to the washing tub 5 to attach metal ions to the laundry and imparting an antibacterial action to the laundry.

  First, the microcomputer 22 opens the water supply valve 9 via the load drive circuit 25 (step # 10). Thereby, water supply to the washing tub 5 is started. Thereafter, the microcomputer 22 determines the opening / closing of the lid 2 based on the signal output from the lid opening / closing detection device 17 (step # 20). If the lid 2 is open (YES in step # 20), the process proceeds to step # 40, and voltage application to the electrode is not started. On the other hand, if the lid 2 is closed (NO in step # 20), the process proceeds to step # 50 through step # 30, so that voltage application between the electrodes 19d and 19e is started and metal ions are eluted into water. .

  In step # 80, the microcomputer 22 determines whether or not the set water level is detected based on the signal output from the water level sensor 14. If the set water level is detected (YES in step # 80), the ion water supply process is terminated. On the other hand, if the set water level is not detected (NO in step # 80), the process returns to step # 10.

  In step # 30, the microcomputer 22 determines whether or not the voltage application time between the electrodes 19d and 19e has exceeded a predetermined time (2 minutes in this embodiment). If the voltage application time between the electrodes 19d and 19e has passed 2 minutes or more (YES in Step # 30), the voltage application between the electrodes 19d and 19e is stopped (Step # 40), and the ion elution is completed. Thereafter, the process proceeds to step # 80. On the other hand, if the voltage application time to the electrode has not passed for 2 minutes or longer (NO in step # 30), the process proceeds to step # 50, and the voltage application between the electrodes 19d and 19e is not stopped.

  In step # 60 following step # 50, the microcomputer 22 determines whether or not the voltage applied between the electrodes 19d and 19e has the same polarity and has continued for a predetermined time (20 seconds in this embodiment) or more. . If it continues for 20 seconds or more with the same polarity (YES in Step # 60), the polarity of the voltage applied between the electrodes 19d and 19e is reversed (Step # 70), and then the process proceeds to Step # 80. On the other hand, if it has not continued for 20 seconds or more with the same polarity (NO in step # 60), the process proceeds directly to step # 80.

  By the flow operation shown in FIG. 5 described above, the microcomputer 22 constantly monitors the opening and closing of the lid 2 during the ion water supply process, and no voltage is applied between the electrodes 19d and 19e when the lid 2 is opened. Therefore, when the user touches the water in the water supply, there is no possibility that the user will get an electric shock, and safety is improved.

  Next, another operation example of the washing machine according to the present embodiment will be described with reference to the flowchart of FIG. In FIG. 6, the same steps as those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The flow shown in FIG. 6 is obtained by adding steps # 22, # 24, # 26, and # 42 to the flow shown in FIG.

  In the flow shown in FIG. 6, if the result of determination in step # 20 is that the lid 2 is open (YES in step # 20), the microcomputer 22 determines whether the end flag is 1 (step # 22). If the end flag is not 1 (NO in step # 22), that is, if the ion elution process is not ended, voltage application between the electrodes 19d and 19e is not performed (step # 24), and the microcomputer 22 The water supply valve 9 is closed via the drive circuit 25 (step # 26), and the process proceeds to step # 20. On the other hand, if the end flag is 1 (YES in step # 22), that is, if the ion elution process has ended, the process proceeds to step # 80.

  Further, in the flow shown in FIG. 6, after performing the process of step # 40, the process does not directly move to step # 80, but after the microcomputer 22 performs the process of setting the end flag to 1 in step # 42, Move to # 80.

  When the lid 2 is opened before the ion elution process is finished by the flow operation shown in FIG. 6, the water supply is stopped, and after the ion elution process is finished, the lid 2 is opened. Even if it becomes, water supply is continued. Accordingly, in a state where the ion elution process is not completed, there is no possibility that the user touches the water electrically connected to the electrodes 19d and 19e, so that the safety is further improved. Further, since the water supply is stopped if the lid 2 is opened before the ion elution process is completed, the ion concentration in the washing tub 5 can be set to the set value.

  Next, still another operation example of the washing machine according to the present embodiment will be described with reference to the flowchart of FIG. In FIG. 7, the same steps as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The flow shown in FIG. 7 is obtained by adding steps # 28, # 44, and # 52 to the flow shown in FIG.

  In the flow shown in FIG. 7, after the process of step # 50 is performed, the microcomputer 22 controls the lid lock mechanism 18 via the load drive circuit 25 in step # 52 instead of directly moving to step # 60. After locking with the lid 2 closed, the process proceeds to step # 60.

  In the flow shown in FIG. 7, after performing the process of step # 42, the microcomputer 22 controls the lid lock mechanism 18 via the load drive circuit 25 in step # 44, instead of directly moving to step # 80. Then, after unlocking the lid 2, the process proceeds to step # 80.

  If it is determined in step # 20 that the lid 2 is open even though the lid 2 is locked, some failure has occurred in the lid open / close detection device 17 or the lid lock mechanism 18. Since it should be, the normal flow ends and the process proceeds to error processing. That is, after performing the process of step # 26, an error process is performed (step # 28) instead of proceeding to step # 20. As an example of the error process, there is a process in which the microcomputer 22 causes the operation display device 15 to display an error.

  Next, another electrical configuration example of the washing machine according to the present embodiment is shown in FIG. 8 that are the same as those in FIG. 4 are given the same reference numerals, and detailed descriptions thereof are omitted.

  The electrical configuration shown in FIG. 8 is different from the electrical configuration shown in FIG. 4 in that a relay 39 is provided between the drive circuit 38 and the electrode 19d, and a relay 40 is provided between the drive circuit 38 and the electrode 19e. It is being done.

  One of the contacts of the relay 39 is connected to the electrode 19d, and the other contact of the relay 39 is connected to the emitter of the phototransistor of the photocoupler 34. One of the contacts of the relay 40 is connected to the electrode 19e, and the other contact of the relay 40 is connected to the emitter of the phototransistor of the photocoupler 33. Further, the coil side of the relay 39 and the coil side of the relay 40 are both connected to the ion control circuit 26. With such a configuration, the microcomputer 22 can control the opening and closing of the contacts of the relays 39 and 40 via the ion control circuit 26.

  Normally, the contacts of the relays 39 and 40 are in an open state, and the electrodes 19d and 19e and the drive circuit 38 are electrically separated from each other. The microcomputer 22 outputs a signal for closing the contact through the ion control circuit 26 to the coil side of the relays 39 and 40 only when a voltage is applied between the electrodes 19d and 19e. The electrodes 19d and 19e are electrically connected to the drive circuit 38. Therefore, the processing of steps # 24 and # 40 can be realized by opening the contacts of the relays 39 and 40 without turning off the photocouplers 33 and 34.

  Instead of the relays 39 and 40, a switch 41 that opens and closes contacts mechanically in conjunction with opening and closing of the lid 2 may be provided. The switch 41 has two sets of normally open contacts. One of the first normally open contacts is connected to the electrode 19d, and the other of the first normally open contacts is connected to the emitter of the phototransistor of the photocoupler 34. One of the second normally open contacts is connected to the electrode 19e, and the other of the second normally open contacts is connected to the emitter of the phototransistor of the photocoupler 33. As shown in FIG. 9, the switch 41 opens and closes its contact in conjunction with opening and closing of the lid 2. That is, when the lid 2 is closed, the switch lever 42 is pushed by the lid 2 so that the switch lever 42 pushes the operation button of the switch 41, and the first normal open contact and the second normal open contact are closed. It becomes a state. On the contrary, when the lid 2 is in an open state, the switch lever 42 is not pushed by the lid 2 and the switch lever 42 does not push the operation button of the switch 41. Therefore, the first normal open contact and the second normal open The contact is opened. Therefore, when the lid 2 is open, the electrodes 19d and 19e and the drive circuit 38 are completely separated from each other. When the lid 2 is closed, the electrodes 19d and 19e and the drive circuit 38 are separated from each other. It will be in the state where it is electrically connected. However, the process of step # 40 performed when the voltage application time between the electrodes 19d and 19e exceeds a predetermined time (2 minutes in the present embodiment) cannot be realized by the switch 41. Therefore, the photocoupler 33 And 34 are turned off.

  In the embodiment described above, the washing machine having a pulsator has been described. However, the present invention is not limited to this embodiment, and can be applied to a direct drive washing machine or a drum washing machine having a pulsator-less structure.

These are the vertical cross-sectional schematics of the washing machine which concerns on this embodiment. These are horizontal sectional views of an ion elution unit. FIG. 3 is a perspective view of an electrode. These are figures which show the electrical structural example of the washing machine which concerns on this embodiment. These are flowcharts which show the operation example of the washing machine which concerns on this embodiment. These are flowcharts which show the other operation example of the washing machine which concerns on this embodiment. These are flowcharts which show the further another operation example of the washing machine which concerns on this embodiment. These are figures which show the other electrical structural example of the washing machine which concerns on this embodiment. These are the partial vertical cross-sectional schematics of the washing machine which concerns on this embodiment.

Explanation of symbols

2 Lid 5 Washing basin 8 Water supply path 9 Water supply valve 14 Water level sensor 16 Control device 17a Magnet 17b Reed switch 18 Lid lock mechanism 18a Convex part 18b Concavity 19 Ion elution unit 19d, 19e Electrode 22 Microcomputer 25 Load drive circuit 26 Ion control circuit 38 Drive circuit 39, 40 Relay 41 Switch 42 Switch lever

Claims (5)

A lid that covers the laundry inlet; a plurality of electrodes provided in the water supply path; and a voltage application circuit that applies a voltage between the electrodes, and water is interposed between the electrodes. In a washing machine that elutes metal ions from an electrode that is an anode by applying a voltage,
The washing machine according to claim 1, wherein the voltage application circuit does not apply a voltage between the electrodes when the lid is open.   The washing machine according to claim 1, wherein water supply to the water supply path is stopped when the lid is opened in a state where the elution process of the metal ions is not completed.   3. The device according to claim 1, further comprising: a lid locking unit that locks the lid in a closed state, wherein the lid is locked by the lid locking unit during the elution process of the metal ions. Washing machine.   The washing machine according to any one of claims 1 to 3, further comprising a switching unit between the voltage application circuit and the electrode.   The washing machine according to claim 4, wherein the switching means is a switch whose contact is opened and closed mechanically in conjunction with opening and closing of the lid.

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