JP2017192576A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine capable of improving a washing performance more than a conventional one.SOLUTION: The washing machine includes a washing tub 2, an alkali metal hydroxide introduction device 3A for introducing an aqueous solution of sodium hydroxide to the washing tub 2, a pH sensor 4 for measuring liquidity of washing water in the washing tub 2, and a control device 5A for controlling the alkali metal hydroxide introduction device. The control device 5A controls an alkali metal hydroxide introduction device in such a manner that the liquidity of the washing water is shifted to a base direction on the basis of the liquidity measured by the pH sensor 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a washing machine.

  In recent years, from the viewpoint of reducing environmental impact and reducing costs during washing, development has progressed in a direction to reduce the amount of water used in washing machines, and at the same time, the amount of detergent used has also been reduced. For this reason, there is a case where dirt is not sufficiently removed by washing of heavily contaminated clothes, and further improvement in cleaning power is demanded.

  In patent document 1, in order to improve detergency, water is electrolyzed and basic water is used for washing, and rinse is performed using acidic water. In patent document 2, ion exchange resin is used to supply water. Technologies for removing magnesium ions and calcium ions have been proposed.

JP-A-5-84384 JP 2003-265890 A

  However, in the technique described in Patent Document 1, generally, tap water, remaining hot water of a bath, or the like is used as water supply, but when these contain a large amount of magnesium ions or calcium ions, they are generated by electrolysis. Magnesium hydroxide and calcium hydroxide may form a metal soap that is hardly soluble in detergent and water, and the cleaning power may be reduced.

  In addition, the technique described in Patent Document 2 is a technique that reduces the proportion of magnesium ions and calcium ions in the water used for washing, suppresses the detergent from being changed into metal soap, and effectively utilizes the cleaning power of the detergent. is there. However, the current trend is to further reduce the environmental burden and the cost of washing, and there is a need for technology to maintain and improve detergency even if the amount of water and detergent used for washing is reduced. ing.

  An object of this invention is to provide the washing machine which can improve a cleaning capability more than before.

  The present invention includes a washing tub, an alkali metal hydroxide introducing device for introducing an alkali metal hydroxide into the washing tub, a liquid property measuring device for measuring the liquidity of the washing water in the washing tub, A control device that controls the alkali metal hydroxide introduction device, the control device shifting the liquidity of the washing water in a basic direction based on the liquidity measured by the liquidity measuring device. The alkali metal hydroxide introducing device is controlled as described above.

  ADVANTAGE OF THE INVENTION According to this invention, the washing machine which can improve a cleaning capability more than before can be provided.

It is a lineblock diagram showing the washing machine of a 1st embodiment. It is a schematic diagram which shows the usage method of the container with which the sodium hydroxide aqueous solution used for the washing machine of 1st Embodiment was filled. It is a flowchart which shows operation | movement of the washing machine of 1st Embodiment. It is a schematic diagram which shows the change by base addition of dirt. It is a schematic diagram which shows the change by base addition of dirt. It is a schematic diagram which shows the change by base addition of dirt. It is a graph which shows the liquid property change of the wash water with and without sodium hydroxide replenishment. It is a graph which shows the relationship between the liquidity of washing water, and a washing | cleaning degree. It is a block diagram which shows the washing machine of 2nd Embodiment. It is a flowchart which shows operation | movement of the washing machine of 2nd Embodiment. It is a block diagram which shows the washing machine of 3rd Embodiment. It is a flowchart which shows operation | movement of the washing machine of 3rd Embodiment. It is a block diagram which shows the washing machine of 4th Embodiment. It is a block diagram which shows the tank washing | cleaning mechanism of the washing machine of 5th Embodiment. It is a block diagram which shows the other tank washing | cleaning mechanism of the washing machine of 5th Embodiment. It is a flowchart which shows operation | movement of the washing machine of 5th Embodiment.

  Hereinafter, washing machines 1A, 1B, 1C, 1D, 1E, and 1F according to embodiments of the present invention will be described with reference to the drawings. Note that the configurations of the washing machines 1A, 1B, 1C, 1D, 1E, and 1F of any of the embodiments are schematically illustrated.

(First embodiment)
FIG. 1 is a configuration diagram illustrating the washing machine according to the first embodiment.
As shown in FIG. 1, the washing machine 1A of the first embodiment includes a washing tub 2, an alkali metal hydroxide introduction device 3A (hereinafter abbreviated as introduction device 3A), and a pH sensor (liquidity measurement device). 4 and a control device 5A.

  The washing tub 2 includes an outer tub 21 and an inner tub 22 that is rotatably disposed in the outer tub 21. In the following description, a vertical fully automatic washing machine in which the washing tub 2 is constituted by the outer tub 21 and the inner tub 22 will be described as an example. However, as in a two-layer washing machine, You may apply to the tank (washing tank) used at the time of a rinse. In addition, the washing machine is not limited to a vertical type or a two-tank type, but is applied to a type that is inclined such that the center axis of the inner tub (drum) is horizontal or the front side is high, such as a drum type. May be.

  The outer tub 21 is made of a synthetic resin and formed into a bottomed cylindrical shape, and is supported by being elastically suspended from an upper end of an outer frame (housing) (not shown). A drain pipe 24 having a drain valve 23 is connected to the bottom 21t of the outer tub 21, and an end of the drain pipe 24 extends outside the machine.

  The inner tub 22 has a bottomed cylindrical shape, and is configured such that the center of the rotation axis faces the vertical direction (vertical direction). A plurality of dewatering holes (not shown) are formed on the peripheral wall surface of the inner tank 22, and a balance ring (not shown) is provided at the upper end of the inner tank 22.

  Further, a stirring blade (not shown) is provided at the bottom of the inner tub 22, and the stirring blade is driven to rotate in the forward and reverse directions by the driving device 25 in the washing process and the rinsing process, and the stirring blade is driven by the driving device 25 in dehydration. And the inner tub 22 are integrally rotated at high speed. Accordingly, when washing and rinsing, the washing water and rinsing water can be stirred together with the laundry by rotating the stirring blade, and at the time of dehydration, water contained in the laundry can be removed. .

  The introduction device 3A is a device that introduces an alkali metal hydroxide into the washing tub 2, and is fixed to the casing of the washing machine 1A. In addition, examples of the alkali metal include lithium, sodium, potassium, rubidium, cesium, and the like, and sodium and potassium that are present in large numbers in the world are preferable. In particular, sodium is the most abundant in the world and is suitable in terms of low cost. For this reason, sodium hydroxide is most preferable as the alkali metal hydroxide, and it is preferable to use an aqueous solution containing sodium hydroxide (hereinafter referred to as an NaOH aqueous solution) in terms of handling by consumers.

  The introduction device 3A also includes a container holder (bottle holder) 31 that holds a container (bottle) 50 filled with an aqueous NaOH solution, and an aqueous NaOH solution in the container 50A that is held by the container holder 31 in the washing tub 2. A charging pipe 32 (sodium hydroxide charging mechanism) to be charged therein and an on-off valve 33 (sodium hydroxide charging mechanism) provided in the charging pipe 32 are provided.

  The container holding part 31 has a bottomed cylindrical shape that holds the container 50A upside down, and an input pipe 32 is fixed through the bottom part 31a. The height of the container holding part 31 is configured such that the bottom of the container 50 </ b> A protrudes above the upper end opening 31 b of the container holding part 31. This facilitates the removal of the container 50A from the container holding part 31.

  The input pipe 32 extends in the vertical direction, and is arranged so that one end protrudes from the bottom 31 a of the container holding part 31 into the container holding part 31 and the other end faces into the washing tub 2. The other end (lower end) of the charging pipe 32 is set so as to be positioned above the surface of the washing water in the washing step. Further, the other end (lower end) of the charging pipe 32 may be positioned so as to face the inner tank 22 as shown in FIG. 1, and is positioned so as to face between the outer tank 21 and the inner tank 22. May be. By placing the input pipe 32 between the outer tub 21 and the inner tub 22, it is possible to prevent the aqueous NaOH solution from directly falling on the laundry such as clothes, and to suppress damage to the laundry.

  The on-off valve 33 is provided in the middle of the charging pipe 32 and can open the NaOH aqueous solution in the container 50 </ b> A into the washing tub 2 by opening the valve. The on-off valve 33 can be selected and applied as appropriate, such as a valve that operates to be fully opened and fully closed, and a valve that can be adjusted in opening.

  As described above, the container holding part 31 is provided above the washing tub 2, and the input pipe 32 extending downward from the bottom 31 a of the container holding part 31 in the vertical direction is provided. As a result, the NaOH aqueous solution Q1 can be introduced into the washing tub 2 by its own weight by simply opening the on-off valve 33, so that the NaOH aqueous solution Q1 can be introduced into the washing tub 2 with a simple mechanism.

  The introduction device 3A is not limited to the configuration in which the introduction device 3A is disposed above (or above) the washing tub 2. A container 50A filled with the NaOH aqueous solution Q1 is disposed below (or below) the washing tub 2. Alternatively, the charging pipe may be arranged so as to extend from the container 50 </ b> A to the upper part of the washing tub 2, and the NaOH aqueous solution Q <b> 1 may be sucked up and fed into the washing tub 2 through a pump (not shown).

  The pH sensor 4 measures the liquidity (pH) of the washing water in the washing process, and is provided at the bottom of the outer tub 21, for example. By measuring the liquidity of the washing water with this pH sensor 4, the liquidity of the washing water can be controlled within the range of the liquidity control region where the cleaning power can be improved. The liquidity control area will be described later.

  The washing machine 1 </ b> A includes a water supply pipe 41 for supplying water to the washing tub 2, a water supply electromagnetic valve 42 for opening and closing the flow path of the water supply pipe 41, a water level sensor 43 for detecting the water level of the washing tub 2, and the like. . A water amount sensor may be used instead of the water level sensor 43.

  The control device 5A is equipped with a CPU (Central Processing Unit), a ROM (Read Only Memory) storing a control program, a CPU board equipped with a RAM (Random Access Memory), an input / output interface board, etc., and a drain valve 23, The on-off valve 33 and the water supply electromagnetic valve 42 are controlled to open and close. The control device 5 </ b> A controls the rotational speed and direction of the motor of the driving device 25, and the liquidity (pH) measured by the pH sensor 4 and the water level (WL of the washing tub 2 measured by the water level sensor 43). ) To get.

Drawing 2 is a mimetic diagram showing the usage method of the container filled with the sodium hydroxide solution used for the washing machine of a 1st embodiment.
As shown in FIG. 2 (a), the container 50A is connected to a housing part 51 filled with an aqueous NaOH solution Q1 and an input pipe 32 that is a discharge port for the aqueous NaOH solution Q1 and protrudes into the container holding part 31. And a cylindrical connection portion 52.

  For example, a rubber packing 53 is provided in an annular shape on the inner wall surface of the connecting portion 52, and when the container 50 </ b> A is held by the container holding portion 31, the input pipe 32 and the packing 53 that protrude into the container holding portion 31 are provided. The space is sealed. Thereby, the NaOH aqueous solution Q1 in the container holding part 31 does not leak into the container holding part 31 from between the connection part 52 and the charging pipe 32.

  In addition, a resin thin film member (film) 54 is provided at a boundary portion between the accommodating portion 51 and the connection portion 52, and the flow path of the connection portion 52 is closed by the thin film member 54 before mounting. The thin film member 54 is formed of a material and strength that is not torn even when turned upside down and that can be broken at the tip (upper end) of the charging tube 32 when the container 50A is mounted on the container holding portion 31. Yes. As described above, by providing the thin film member 54 at the boundary portion, the thin film member 54 is broken by the charging pipe 32 after filling the gap between the charging pipe 32 and the connecting portion 52, so that liquid leakage from the container 50A is ensured. Can be prevented. The thin film member 54 is not limited to resin, and may be made of metal such as aluminum foil.

  The container 50A in the state of FIG. 2 (a) is turned upside down and is held and pushed into the container holding part 31 of FIG. 2 (b), so that the container 50A is turned upside down and in the state of FIG. 2 (c). Retained. At this time, the on-off valve 33 is in a closed state. As described above, since the thin film member 54 is provided at the connection portion 52 of the container 50A, the NaOH aqueous solution Q1 does not leak from the container 50A until the input pipe 32 reaches the thin film member 54.

  Further, as shown in FIG. 2 (c), in a state where the container 50A is mounted on the container holding part 31, the tip (upper end) of the charging pipe 32 is prevented from protruding greatly into the accommodating part 51 (thin film The amount of protrusion that can break the member 54 is necessary), and the amount of the aqueous NaOH solution Q1 in the container 50A can be reduced.

  Although sodium hydroxide is often sold as pellets, it is desirable to use it as an aqueous solution so that consumers can easily use it. In the case of an aqueous solution, the concentration is preferably about 1 mol / liter (about 4 wt%). In the first embodiment, as described above, by providing the introduction device 3A, a necessary amount of NaOH aqueous solution is supplied into the washing tub 2 under the control of the control device 5A, and contact of the NaOH aqueous solution with the bare skin can be avoided. .

FIG. 3 is a flowchart showing the operation of the washing machine according to the first embodiment. In FIG. 3, only the washing process is illustrated.
First, when executing the washing process, laundry such as clothes is put into the inner tub 22 and detergent is put into a detergent case (not shown). Then, the user turns on a power button (not shown), selects a desired washing course, and presses an operation start button (not shown) to start the washing process.

  As shown in FIG. 3, in step S1, the control device 5A opens the water supply electromagnetic valve 42 and starts water supply from the water supply pipe 41 to the washing tub 2 (the outer tub 21 or the inner tub 22). And 5A of control apparatuses monitor a water level with the water level sensor 43, and when it has reached | attained having reached the preset water level, the water supply electromagnetic valve 42 is closed and water supply is stopped.

  In step S <b> 2, the control device 5 </ b> A measures the pH of the supplied water (wash water) by the pH sensor 4 (measures the liquidity). Then, the control device 5A drives the drive device 25 and rotates the stirring blade (not shown) in both forward and reverse directions to start the washing operation. At this time, in many cases, the pH of the washing water decreases (for example, 6.5 or less). This is because the acidic dirt adhering to the clothes is dissolved in the washing water, and in such a state, the cleaning power of the added detergent cannot be sufficiently exerted. Therefore, in the first embodiment, NaOH is changed so that the liquidity (pH) of the washing water is shifted (shifted) in the basic direction, that is, the liquidity (pH) of the washing water is 6.8 or more. Add aqueous solution Q1. The basic direction means that the liquidity is not limited to basic, but the liquidity may be pH 6.8 or more and neutral.

  In step S3, the control device 5A determines whether or not the liquidity (pH) of the washing water is less than the liquidity control region, and if it is determined that it is less than the liquidity control region (Yes), Proceeding to the process of S4, if it is determined that it is not less than the liquidity control region (No), the process proceeds to the process of step S5. The liquidity control region is set to, for example, pH 6.8 or more and pH 9.5 or less, and is a range in which the washing power of the laundry can be sufficiently exhibited. In addition, if pH is less than 6.8, it will become impossible to fully demonstrate a detergency, and if pH exceeds 9.5, it will become easy to do the cloth pain of a laundry.

  In step S4, the control device 5A opens the on-off valve 33 and puts the NaOH aqueous solution Q1 into the washing tub 2 (the outer tub 21 or the inner tub 22). That is, when the on-off valve 33 is opened, the NaOH aqueous solution Q1 in the container 50A is introduced into the washing tub 2 through the introduction pipe 32. The valve opening time (amount of NaOH aqueous solution) of the on-off valve 33 is, for example, a map search in which the liquidity (pH) measured by the pH sensor 4 is related to the valve opening time (by a preliminary test). Determined). After the NaOH aqueous solution Q1 is added, the process returns to step S2.

  In step S5, the control device 5A determines whether or not the predetermined time has elapsed, and if it is determined that the predetermined time has elapsed (Yes), the control device 5A proceeds to the rinsing process and the predetermined time has not elapsed. When it determines (No), it returns to step S2. The predetermined time is a time required for the washing process, and is a time set in the operation course at the start of operation.

  In the rinsing process, after the washing water in the washing process is once discharged outside the apparatus, new water (rinse water) is supplied, and by driving the driving device 25, the stirring blade (not shown) is rotated in both forward and reverse directions. The And it dehydrates after completion | finish of a rinse, and a rinse process is complete | finished. In the dehydration, the laundry is centrifugally dehydrated by rotating both the inner tub 22 and the stirring blade (not shown) at a high speed.

  Thus, in 1st Embodiment, the mechanism in connection with electrolysis in embodiment mentioned later becomes unnecessary by using the container 50A filled with NaOH aqueous solution Q1. Thereby, the configuration of the washing machine 1A can be simplified and the manufacturing cost can be reduced.

Next, the principle (estimation) for improving the cleaning power will be described with reference to FIGS. FIG. 4 to FIG. 6 are schematic diagrams showing changes of soil due to addition of a base.
In the washing machine 1A of the first embodiment, how to improve the cleaning power by using sodium hydroxide (NaOH) at the time of washing, the principle is as follows: (a) Canceling the association of dirt; (b) This is divided into salt structure formation, and finally these principles are summarized in (c). In the present invention, the control of the liquidity of the washing water is important, and the reason is shown in the following (d).

(A) Cancellation of dirt association As shown in FIG. 4, the dirt 10 and the dirt 11 have a structure in which they are associated by the hydrogen bonds 12 of the heteroatoms they have. When the size of the dirt is large, it is difficult to make a structure in which the surfactant is included. When sodium hydroxide (NaOH) is added to this, the anion OH ⁻ (hydroxide ion) forms a hydrogen bond with the positively charged atom of the dirt 10, so By cutting, it is divided into dirt 10 and dirt 11, and as a result, dirt is reduced. Thereby, it is presumed that the inclusion of dirt by the surfactant is facilitated and the cleaning power is improved.

(B) Formation of Salt Structure As shown in FIG. 5, it is assumed that the dirt 13 is a dirt having a carboxyl group (COOH). Here, when sodium hydroxide (NaOH) is added, the carboxyl group adopts a sodium salt structure and water solubility is improved. For this reason, dirt that is hardly soluble in the washing water is easily dissolved in the washing water, and the cleaning power is improved.

(C) Summary As shown in FIG. 6, when sodium hydroxide (NaOH) is added to the soil aggregate 16 in which a plurality of soils 15 are associated by hydrogen bonds 14, the hydrogen bonds 14 are broken and the carboxyl groups Becomes a sodium salt structure, and the aggregate 7 is divided into a plurality of stains 15, whereby the cleaning power is improved.

(D) Reasons why liquidity control is necessary Usually, when laundry is washed, the liquidity shifts to acidity. This is thought to be due to the fact that the dirt on clothes in daily life is rich in acidic substances. Since human sebum is mainly derived from fatty acids, dirt becomes slightly acidic. In addition, dust derived from exhaust gas from automobiles, trucks, etc. is generated by the oxidation of organic matter, so that when they enter the water, the water becomes acidic. If the washing liquid becomes acidic, there is a possibility that reassociation may occur even if the hydrogen bonds of the soil aggregate are broken. Therefore, it is desirable that the washing water always maintain a weak basicity, for example.

  However, if the basicity is too strong, the colored clothing may be discolored or discolored, which may impair the design. This is because when the clothing colorant has acidic groups such as sulfonic acid groups, carboxyl groups, and phenolic hydroxyl groups, these acidic groups have a salt structure in a basic environment, improving water solubility, and dissolving the colorant in washing water. To do. This means that the colorant in the garment is detached, which eventually results in garment decolorization or discoloration. In order to prevent such decolorization and discoloration, it is desirable to control the liquidity of the washing liquid (washing water including a detergent) to prevent it from becoming extremely basic, and specifically to a pH of 9.5 or lower. It is desirable. Therefore, in the washing machine 1A of the first embodiment, it is desirable to control the liquidity of the washing liquid (washing water) from near neutral to weakly basic, specifically, pH 6.8 or more and 9.5 or less.

Embodiments of the present invention will be described below with reference to the drawings.
Example 1
The washing ability of the washing machine 1A of the present invention was examined in accordance with JIS C 9811.
In a drum type washing machine, 100 wet artificially contaminated cloths (manufactured by Laundry Science Association) and 20 g of a commercially available liquid detergent were placed, and washing (washing) was performed at a setting of 30 liters of water. The washing time was 10 minutes, and the liquidity (pH) of the washing water was measured in the middle (after 3 minutes and after 6 minutes) and after washing. The result is shown in FIG.

The experiment was performed by changing the liquid condition of the washing water in three ways. The three conditions are as follows.
(1) Process of washing without adding any sodium hydroxide (see reference numeral 51 in FIG. 7)
(2) Process of washing after adding 10 g of 4 wt% (mass%) NaOH aqueous solution before washing (the pH of washing water before washing is set to 9.4) (see reference numeral 52 in FIG. 7)
(3) 10 g of 4 wt% (mass%) NaOH aqueous solution before washing is added to the washing water (the washing water pH before washing is set to 9.4), washing is performed, and acidity (pH is 6.4) after 3 minutes from the start. The operation 53 (see FIG. 7) of adding 8 g of a 4 wt% (mass%) NaOH aqueous solution to the washing water was performed. As a result, the liquidity is adjusted to the vicinity of the value before washing (pH is 9.2), washing is resumed, and after 6 minutes, 4 wt% (mass by weight) in washing water that has become acidic (pH is 6.6). %) Was added 54 g of NaOH aqueous solution (see FIG. 7). As a result, the liquidity is adjusted to the vicinity of the value before washing (pH is 9.2), and washing is resumed (see reference numeral 55 in FIG. 7).
As a result of washing the wet artificial soiled cloth in each of the processes (1), (2) and (3), the degree of washing was as follows. The higher the value, the higher the cleaning degree.
Process cleanliness (1) 22
(2) 32
(3) 43
In the process (3), the liquidity of the washing water was kept basic, but the processes (1) and (2) were finally in an acidic state with a liquidity of less than 6.
From this result, it was shown that cleaning performance is improved by keeping the liquidity basic.

(Example 2)
In the washing machine 1A having the mechanism shown in FIG. 1, as in Example 1, 100 wet artificially contaminated cloths (made by the Laundry Science Association), 20 g of a commercially available liquid detergent, and a setting of 30 liters of water are set. Washed (washed). The washing time was also 10 minutes. However, liquid property was not examined on the way.
The washing machine 1A shown in FIG. 1 has a mechanism for measuring the liquidity of the washing water in real time and adding an aqueous NaOH solution when the liquidity is slightly shifted to acidity. For this reason, the pH maintained during washing can be controlled in advance. Note that the concentration of the NaOH aqueous solution used is 4 wt%. This time, the experiment was carried out with 9 types of washing water pH of 5.8 / 6.4 / 6.5 / 6.8 / 7.2 / 7.5 / 8.6 / 9.4 / 10.5. The relationship between liquidity and cleanliness was examined. The result is shown in FIG.

As a result, as shown in FIG. 8, when the pH was 6.8 or more, a remarkable improvement in the cleaning degree was confirmed. Further improvement was confirmed when the pH was 7.5 or higher.
From the above, it was shown that the washing degree can be remarkably improved by controlling the liquidity of the washing water to pH 6.8 or more.

  As explained above, in the washing machine 1A of the first embodiment, the washing tub 2, the alkali metal hydroxide introduction device 3A for introducing the alkali metal hydroxide (sodium hydroxide aqueous solution) into the washing tub 2, The pH sensor 4 for measuring the liquidity of the washing water in the washing tub 2 and the control device 5A for controlling the introduction of the alkali metal hydroxide in the alkali metal hydroxide introduction device 3A are provided. Based on the liquidity measured by the pH sensor 4, the alkali metal hydroxide introduction device 3A is controlled so that the liquidity of the washing water shifts to the basic direction. According to this, since the wash water liquidity can be shifted to a basic direction (for example, near neutral to weakly basic), it is possible to improve the cleaning ability more than before (see FIG. 7).

  Moreover, in 1st Embodiment, 5 A of control apparatuses are comprised so that the liquid property of wash water may be controlled to the liquid property control area | region of 6.8 or more and 9.5 or less. Thereby, it is possible to improve the cleaning power while suppressing the cloth damage of the laundry (see FIG. 8).

  In the first embodiment, when the control device 5A determines that the liquidity of the wash water has decreased below the liquidity control region (S3, Yes in FIG. 3), the alkali metal hydroxide introduction device 3A is controlled. By doing so, the NaOH aqueous solution Q1 (alkali metal hydroxide) is added to the wash water, and control is performed to return to the liquid control region (S4 in FIG. 3). Thus, the washing performance of the laundry can be improved by keeping the liquidity basic.

  In the first embodiment, the alkali metal hydroxide introduction device 3A is held by the container holding unit 31 and the container holding unit 31 that hold the container 50A filled with the NaOH aqueous solution Q1 as an alkali metal hydroxide. A feeding mechanism (feeding pipe 32 and opening / closing valve 33) for feeding the NaOH aqueous solution Q1 in the container 50A into the washing tub 2; Thereby, NaOH aqueous solution can be thrown into the washing tub 2 with a simple mechanism.

(Second Embodiment)
FIG. 9 is a configuration diagram illustrating the washing machine according to the second embodiment. Note that in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
As shown in FIG. 9, the washing machine 1B of the second embodiment includes a washing tub 2, an alkali metal hydroxide introduction device (hereinafter abbreviated as introduction device) 3B, a pH sensor (liquidity measurement device) 4, and a control. And a device 5B.

  The introduction device 3B throws into the washing tub 2 a container holding unit 31 that holds a container 50B filled with a sodium chloride aqueous solution (NaCl aqueous solution) S2, and a NaCl aqueous solution Q2 in the container 50B held by the container holding unit 31. Electrolyzing the introduction pipe 32 (sodium chloride introduction mechanism) and the on-off valve 33 (sodium chloride introduction mechanism) for opening and closing the flow path of the introduction pipe 32 and the sodium chloride aqueous solution Q2 introduced by the sodium chloride introduction mechanism, A sodium hydroxide aqueous solution generation unit 60 that generates an aqueous solution containing sodium hydroxide as an alkali metal hydroxide. The sodium chloride charging mechanism is configured similarly to the sodium hydroxide charging mechanism of the first embodiment. Further, the container 50B has the same configuration as the container 50A in the first embodiment, except that the contents are different. Thereby, the NaCl aqueous solution Q <b> 2 can be supplied into the washing tub 2 by mounting the container 50 </ b> B on the container holding portion 31.

  In addition, in 2nd Embodiment, it is not limited to the structure which provides the container 50B, the container holding | maintenance part 31, the injection pipe 32, and the on-off valve 33 above the washing tub 2, The container 50B is below the washing tub 2 (or It may be arranged in the lower part and sucked up by a pump. In FIG. 9, the NaCl aqueous solution Q <b> 2 is put into the inner tank 22, but may be put into the outer tank 21.

  The sodium hydroxide aqueous solution generator 60 includes a positive electrode plate 61, a negative electrode plate 62, and a power source 63.

  The positive electrode plate 61 and the negative electrode plate 62 are each made of platinum or the like, and are provided separately from the bottom of the outer tub 21.

  The power source 63 is composed of a primary battery or a secondary battery, and is connected to the positive electrode plate 61 via the electric wire 61a and connected to the negative electrode plate 62 via the electric wire 62a. The power source 63 is connected to the control device 5B and energizes between the positive electrode plate 61 and the negative electrode plate 62 by turning on a switch (not shown).

  The control device 5B controls opening / closing of the drain valve 23, the opening / closing valve 33, and the water supply electromagnetic valve 42. Further, the control device 5B controls the rotational speed and direction of the motor of the drive device 25, controls the power source 63 to energize the positive electrode plate 61 and the negative electrode plate 62, and is further measured by the pH sensor 4. The liquid property (pH) and the water level (WL) of the washing tub 2 measured by the water level sensor 43 are acquired.

  In the washing machine 1B, the end of the drain pipe 24 is connected to a drain port provided on the floor surface G (or waterproof pan). A drain trap 26 is provided under the floor, and a water seal 27 is formed on the drain trap 26.

FIG. 10 is a flowchart showing the operation of the washing machine of the second embodiment.
As shown in FIG. 10, after the laundry and the detergent are put into the washing tub 2, the control device 5 </ b> B opens the water supply electromagnetic valve 42 to supply water into the washing tub 2 from the water supply pipe 41 in step S <b> 1. .

  In step S1, the control device 5B detects the amount of water supplied by the water level sensor 43, and when the predetermined amount of water is reached, closes the water supply electromagnetic valve 42 to stop the water supply. The NaCl aqueous solution Q2 may be input at the same time as the water supply or after the water supply.

  In step S2, the control device 5B measures the wash water liquidity with the pH sensor 4, and then proceeds to step S3 to determine whether or not the wash water liquidity measured in step S2 is less than the liquidity control region. judge.

  In step S3, when it is determined that the liquid is less than the liquid control region (Yes), the control device 5B proceeds to the process of step S6 and determines that the liquid is not less than the liquid control region. If (No), the process proceeds to step S5.

  In step S6, the control device 5B opens the on-off valve 33, so that the NaCl aqueous solution is introduced into the washing tub 2 from the container 50B through the charging pipe 32, and the NaCl aqueous solution charged into the washing tub 2 is supplied. Electrolyze. For example, when the washing water containing the NaCl aqueous solution Q <b> 2 is supplied to a position covering the positive electrode plate 61 and the negative electrode plate 62, a current is passed from the power source 63 to the positive electrode plate 61 and the negative electrode plate 62. The voltage of the power supply 63 at this time is controlled to 6 V (volts), for example. This electrolysis produces NaOH (sodium hydroxide) in the wash water. As a result, the pH of the wash water increases and becomes basic (shifts in the basic direction).

  After adjusting the pH to 6.8 to 9.5 (6.8 or more and 9.5 or less) by electrolysis when the water supply has progressed to some extent, the driving device 25 is driven to drive the inner tank 22 and the stirring blade (not shown). The washing process in the washing process is started by rotating. When the washing operation is executed, the pH of the washing water is lowered. Therefore, the NaCl aqueous solution is introduced so as to enter the liquidity control region having a pH of 6.8 to 9.5 again, and the electrolysis is executed.

  In step S10, the control device 5B executes a rinsing process (including dehydration). That is, after the washing water in the washing process is discharged outside the machine, new water (rinse water) is supplied, and the driving device 25 is driven to rotate the inner tank 22 and the stirring blade (not shown) in both forward and reverse directions. Let After rinsing is completed, the rinsing water in the washing tub 2 is discharged out of the machine and dewatering is performed. In the dehydration, the laundry is centrifugally dehydrated by rotating both the inner tub 22 and the stirring blade (not shown) at a high speed. The rinsing process is not limited to one time, and may be performed a plurality of times.

  In step S13, the control device 5B executes a discharge process. That is, the control device 5B opens the on-off valve 33 and puts the NaCl aqueous solution Q2 into the washing tub 2. Further, the control device 5B opens the drain valve 23 so that the sodium chloride aqueous solution Q2 put into the washing tub 2 passes through the drain port 21s (see FIG. 9) of the outer tub 21 and the drain pipe 24. Supplied to water seal 27. At this time, the wall surface of the drain pipe 24 from the wall surface of the drain port 21 s is coated with the NaCl aqueous solution Q 2, and the NaCl aqueous solution is stored in the water seal 27.

  Since NaCl has an effect of suppressing the growth of bacteria such as fungi, the growth of bacteria is suppressed in the drain 21 s of the outer tub 21, the drain pipe 24, and the water seal 27 until the next washing. It is possible to suppress the generation of odors derived from bacteria.

  In the second embodiment configured as described above, the same effects as those of the first embodiment can be obtained. Moreover, in 2nd Embodiment, since the washing tub 2 serves as an electrolytic vessel, the member regarding an electrolytic vessel can be abbreviate | omitted.

(Third embodiment)
FIG. 11 is a configuration diagram illustrating the washing machine according to the third embodiment.
As shown in FIG. 11, the washing machine 1C of the third embodiment is provided with an electrolysis tank 71 separately from the washing tub 2, and can supply NaOH (sodium hydroxide) by electrolyzing the NaCl aqueous solution Q2. It is. Note that in the third embodiment, identical symbols are assigned to configurations similar to those in the second embodiment and redundant descriptions are omitted.

  The washing machine 1C includes a washing tub 2, an alkali metal hydroxide introduction device (hereinafter abbreviated as introduction device) 3C, a pH sensor (liquidity measurement device) 4, and a control device 5C.

  The introduction device 3C includes a container holding unit 31 that holds the container 50B filled with the NaCl aqueous solution Q2, a charging mechanism that puts the NaCl aqueous solution in the container 50B held by the container holding unit 31 into the washing tub 2, a container A sodium hydroxide aqueous solution generation input unit 70 for electrolyzing the NaCl aqueous solution Q2 in the container 50B held in the holding unit 31 to generate an aqueous solution containing NaOH as an alkali metal hydroxide and charging it into the washing tub 2; , And is configured. The sodium chloride charging mechanism is constituted by a charging pipe 32 and an on-off valve 33 as in the second embodiment.

  The sodium hydroxide aqueous solution generation charging unit 70 includes an electrolysis tank 71, a pH sensor 4a, a water level sensor 43a, a charging pipe 72, and an on-off valve 73.

  The electrolysis tank 71 is provided separately from the washing tub 2 (the outer tub 21 and the inner tub 22), and includes a positive electrode plate 64 and a negative electrode plate 65. In addition, an input pipe 32 extending from the container holding portion 31 is connected to the electrolysis tank 71 so as to be inserted into the electrolysis tank 71.

  In addition, the electrolysis tank 71 is formed with a partition plate 74 formed between the positive electrode plate 64 and the negative electrode plate 65 so as to hang downward in the vertical direction from the ceiling surface.

  The pH sensor 4a measures the liquidity (pH) of the aqueous solution in the electrolysis tank 71. The water level sensor 43a measures the water level of the aqueous solution in the electrolysis tank 71, and is configured such that the amount of the aqueous solution introduced into the electrolysis tank 71 is controlled by the control device 5C.

  The input pipe 72 is connected to the bottom surface of the electrolysis tank 71 and extends into the washing tub 2. The on-off valve 73 is provided in the input pipe 72 and is configured to allow the NaOH aqueous solution to be input into the washing tub 2 by opening the valve.

  The washing machine 1 </ b> C also includes a chlorine gas recovery input mechanism 80 and a hydrogen gas recovery input mechanism 90.

  The chlorine gas recovery and input mechanism 80 is a device that recovers chlorine (Cl) gas generated by electrolysis of the NaCl aqueous solution in the electrolysis tank 71 and inputs the recovered chlorine gas into the washing tub 2.

  The chlorine gas recovery and input mechanism 80 includes a cylinder 81 that stores chlorine gas, a piston 82 that is movably inserted into the cylinder 81, and a chlorine gas that recovers chlorine gas in the electrolysis tank 71 into the cylinder 81. The recovery pipe 83, the chlorine gas input pipe 84 that supplies the chlorine gas in the cylinder 81 to the washing tub 2, and the opening / closing valve 85 provided in the chlorine gas input pipe 84 are configured.

  The piston 82 is driven through an actuator (not shown). Further, the tip (lower end) of the chlorine gas input pipe 84 extends to the bottom of the washing tub 2 (between the outer tub 21 and the inner tub 22).

The hydrogen gas recovery and input mechanism 90 is a device that recovers hydrogen (H ₂ ) gas generated by electrolysis of the NaCl aqueous solution in the electrolysis tank 71 and inputs the recovered hydrogen gas into the washing tub 2.

  The hydrogen gas recovery and input mechanism 90 includes a cylinder 91 that stores hydrogen gas, a piston 92 that is inserted into the cylinder 91 so as to freely advance and retract, and a hydrogen gas that recovers the hydrogen gas in the electrolysis tank 71 into the cylinder 91. A recovery pipe 93, a hydrogen gas introduction pipe 94 for introducing hydrogen gas in the cylinder 91 into the washing tub 2, and an on-off valve 95 provided in the hydrogen gas introduction pipe 94 are configured.

  The piston 92 is driven through an actuator (not shown). Further, the tip (lower end) of the hydrogen gas input pipe 94 extends to the bottom of the washing tub 2 (between the outer tub 21 and the inner tub 22).

  The control device 5C controls the opening and closing of the drain valve 23, the on-off valve 33, the water supply electromagnetic valve 42, and the on-off valves 85 and 95. The control device 5 </ b> C controls the rotational speed and direction of the motor of the driving device 25, and controls energization of the positive electrode plate 64 and the negative electrode plate 65 via the power supply 66. In addition, the control device 5C includes the liquidity (pH) of the washing tub 2 measured by the pH sensor 4, the water level (WL) of the washing tub 2 measured by the water level sensor 43, and the electrolysis tank measured by the pH sensor 4a. The liquid level (pH) of 71 and the water level of the washing tub 2 measured by the water level sensor 43a are acquired.

  In the washing machine 1 </ b> C configured as described above, when the NaCl aqueous solution in the container 50 </ b> B is charged into the electrolysis tank 71, the positive electrode plate 64 and the negative electrode plate 65 are energized via the power supply 66 and electrolysis starts. Is done. In the positive electrode plate 64 (anode), chloride ions are decomposed and chlorine is generated by the oxidation reaction, and in the negative electrode plate 65 (cathode), water is decomposed and hydrogen is generated by the reduction reaction. NaOH is produced in the aqueous solution. Since the electrolysis tank 71 is provided with a partition plate 74 between the positive electrode plate 64 and the negative electrode plate 65, the chlorine gas generated by the positive electrode plate 64 is collected in the cylinder 81 and is then supplied to the negative electrode. The hydrogen gas generated by the plate 65 is collected in the cylinder 91.

  The liquidity (pH) of the aqueous solution in the electrolysis tank 71 is preferably controlled to 11 or less. When the pH exceeds 11, the generated chlorine gas reacts with NaOH (sodium hydroxide), and sodium hypochlorite is promoted and generated, so that the production rate of NaOH with respect to the current input amount decreases. Therefore, it is preferable to control the pH of electrolyzed water in electrolysis to 11 or less.

  The aqueous NaOH solution generated in the electrolysis tank 71 is introduced into the washing tub 2 by opening the on-off valve 73 in the washing process. As a result, the liquidity of the wash water shifts to the basic direction (for example, shifts to basic).

FIG. 12 is a flowchart showing the operation of the washing machine of the third embodiment.
As shown in FIG. 12, in the rinsing process of step S11, the control device 5C opens the on-off valve 85 for the chlorine gas recovered in the cylinder 81 by the electrolysis in step S7, and the piston 82 is not shown. Rinse into the water by driving through the actuator. Thus, the chlorine gas can be used for sterilization of rinse water.

  In addition, the control device 5C opens the on-off valve 95 and drives the piston 92 via an actuator (not shown) with the hydrogen gas recovered in the cylinder 91 by electrolysis in the washing process of step S7. Wash hydrogen gas and put it in water. Thus, foaming by a detergent can be assisted by hydrogen gas.

  In the third embodiment configured as described above, the same effect as in the first embodiment can be obtained. Moreover, in 3rd Embodiment, it becomes possible to collect | recover chlorine gas by providing the electrolysis tank 71, and it can use for the disinfection of rinse water by throwing this into rinse water. Moreover, when controlling the addition amount to the electrolysis tank 71, since it is a liquid if it is a solution, since the flow rate is detected and the addition amount can be finely controlled by opening and closing the valve, it is preferable compared to powder or solid.

(Fourth embodiment)
FIG. 13 is a configuration diagram illustrating a washing machine according to the fourth embodiment.
As shown in FIG. 13, the washing machine 1D of the fourth embodiment has a configuration using sodium chloride in powder or pellet form instead of the container 50B filled with the NaCl aqueous solution Q2 in the third embodiment.

  The washing machine 1D includes a washing tub 2, an alkali metal hydroxide introduction device (hereinafter abbreviated as introduction device) 3D, a pH sensor (liquidity measurement device) 4, and a control device 5D. .

  The introduction device 3D includes a sodium chloride (NaCl) addition unit for adding sodium chloride (NaCl), and a sodium chloride aqueous solution generation unit (NaCl aqueous solution generation unit) 100 that generates NaCl aqueous solution by dissolving NaCl in the NaCl addition unit in water. And an aqueous solution of sodium hydroxide aqueous solution 70 for generating an aqueous solution containing NaOH as an alkali metal hydroxide by electrolyzing the NaCl aqueous solution.

  The NaCl aqueous solution generation unit 100 includes a tray 34 (sodium chloride addition unit), an input pipe 35, a water supply branch pipe 41a, an introduction pipe 44, and an on-off valve 45.

  The saucer 34 has a substantially conical shape and is configured so that NaCl can be added. One end (upper end) of the input pipe 35 is connected to the lower end of the tray 34, and the other end (lower end) of the input pipe 35 extends into the electrolysis tank 71. The water supply branch pipe 41 a is branched from the water supply pipe 41 and connected thereto, and is connected to the introduction pipe 44 via the on-off valve 45. The introduction pipe 44 is configured such that water flows spirally on the inner wall surface of the tray 34. Thereby, CaCl can be dissolved little by little.

  In the fourth embodiment configured as described above, the same effect as in the first embodiment can be obtained. Further, in the fourth embodiment, sodium chloride can be used in bulk (powder, pellet) instead of an aqueous solution, so that salt stored in a kitchen or the like can be used as it is.

(Fifth embodiment)
FIG. 14 is a block diagram showing a tank cleaning mechanism in the washing machine of the fifth embodiment, FIG. 15 is a block diagram showing another tank cleaning mechanism of the washing machine of the fifth embodiment, and FIG. 16 is a fifth embodiment. It is a flowchart which shows operation | movement of this washing machine.
As shown in FIG. 14, in the washing machine 1 </ b> E of the fifth embodiment, an outer tub cover 29 is provided at the upper end of the outer tub 21, and a water channel member 110 (a tub cleaning member) is provided on the lower surface of the peripheral edge of the outer tub cover 29. Is provided. The water channel member 110 is formed in a ring shape and is arranged extending in the circumferential direction. Further, the water channel member 110 is disposed at a position facing the upper surface 28 a of the balance ring 28 provided at the upper end of the inner tank 22. In addition, the lower surface 110a of the water channel member 110 is formed with a water spray hole 110b through which cleaning water (fresh water) is sprinkled. The watering holes 110b are formed at a plurality of locations at intervals in the circumferential direction.

  In the washing machine 1E configured as described above, when cleaning water is supplied to the water channel member 110 through the cleaning water supply pipe 41b branched from the water supply pipe 41, the inner tub is formed from the upper surface 28a of the balance ring 28 through the water spray hole 110b. The outer peripheral wall surface 22a of the inner tub 22 is cleaned by flowing downward along the outer peripheral wall surface 22a of the inner tank 22. Further, when the inner tub 22 is rotated, water is sprayed from the sprinkling holes 110b to the upper surface 28a of the balance ring 28, so that the cleaning water is blown off by the centrifugal force to the inner peripheral wall surface 21a of the outer tub 21, and thereafter the inner peripheral wall surface 21a. The inner peripheral wall surface 21a of the outer tub 21 is cleaned by flowing down along the path.

  Further, as shown in the washing machine 1F of FIG. 15, a watering hole 110d may be provided on the outer surface 110c of the water channel member 110. Thereby, the wash water sprayed from the water sprinkling hole 110d hits the inner peripheral wall surface 21a of the outer tub 21 and flows down along the inner peripheral wall surface 21a, thereby cleaning the inner peripheral wall surface 21a. Moreover, the wash water that collided with the inner peripheral wall surface 21a from the water spray hole 110d is splashed to the outer peripheral wall surface 22a of the inner tank 22, and flows downward along the outer peripheral wall surface 22a, thereby cleaning the outer peripheral wall surface 22a.

  As shown in FIG. 16, the control device executes a step bath cleaning process after the rinsing process in step S11 is completed. In the tank washing step, as described above, washing of the washing tub 2 (the outer tub 21 and the inner tub 22) is executed, and adhesion of mold or the like to the washing tub 2 can be suppressed.

  The present invention is not limited to the embodiments described above, and includes various modifications. For example, the alkali metal hydroxide introduction device 3A, the container holding unit 31 that holds the container 50B filled with the NaCl aqueous solution, and the introduction device that includes the sodium chloride introduction mechanism that introduces the NaCl aqueous solution are separately provided, During washing, the control device is controlled to open the on-off valve and the NaOH aqueous solution is charged into the washing tub 2. After the rinsing process or after the tub washing step, the control device is controlled to open the on-off valve to open the NaCl aqueous solution. May be put into the washing tub 2 and discharged. This eliminates the need for an electrolysis mechanism, simplifies the configuration, suppresses the growth of bacteria, and suppresses the generation of malodor derived from bacteria.

1A, 1B, 1C, 1D, 1E, 1F Washing machine 2 Washing tub 3A, 3B, 3C, 3D Alkali metal hydroxide introduction device 4 pH sensor (liquidity measuring device)
5A, 5B, 5C, 5D Control device 10 Dirt 11 Dirt 12 Hydrogen bond 13 Dirt 14 Hydrogen bond 15 Dirt 16 Dirt assembly 21 Outer tank 22 Inner tank 25 Drive unit 31 Container holding unit 32 Input pipe (sodium hydroxide input mechanism) Sodium chloride input mechanism)
33 On-off valve (sodium hydroxide charging mechanism, sodium chloride charging mechanism)
34 saucer (sodium chloride addition part)
35 Input pipe 41 Water supply pipe 42 Water supply solenoid valve 43 Water level sensor S1 Sodium hydroxide aqueous solution S2 Sodium chloride aqueous solution 50A Sodium hydroxide aqueous solution container 50B Sodium chloride aqueous solution container 53 Packing 54 Thin film member 60 Sodium hydroxide aqueous solution generating part 61 Positive electrode (electrode)
62 Negative electrode (electrode)
63 Power Supply 64 Positive Electrode 65 Negative Electrode 66 Power Supply 70 Sodium Hydroxide Aqueous Solution Generation Input Unit 80 Chlorine Gas Recovery Input Mechanism 81 Cylinder (Chlorine Gas Recovery Unit)
82 Piston (Chlorine gas recovery part)
83 Chlorine gas recovery pipe (chlorine gas recovery section)
84 Input pipe (chlorine gas input mechanism)
85 On-off valve (chlorine gas input mechanism)
90 Hydrogen gas recovery and input mechanism 100 Sodium chloride aqueous solution generator 110 Water channel member (tank cleaning member)

Claims (14)

A washing tub,
An alkali metal hydroxide introducing device for introducing an alkali metal hydroxide into the washing tub;
A liquid property measuring device for measuring the liquid property of the washing water in the washing tub;
A control device for controlling the alkali metal hydroxide introduction device,
The control device controls the alkali metal hydroxide introduction device so that the wash water is shifted in a basic direction based on the liquid property measured by the liquid property measurement device. And a washing machine. The washing machine according to claim 1,
The said control apparatus controls the liquid property of the said washing water to the liquid property control area | region of 6.8 or more and 9.5 or less. The washing machine according to claim 2,
When it is determined that the liquidity of the washing water has decreased below the liquidity control region, the control device controls the alkali metal hydroxide introduction device to remove the alkali metal hydroxide from the washing water. The washing machine is characterized in that the control for returning to the liquid property control area is executed. In the washing machine according to claim 2 or claim 3,
The alkali metal hydroxide introducing device is:
A container holding unit for holding a container filled with an aqueous sodium hydroxide solution as the alkali metal hydroxide;
A sodium hydroxide charging mechanism for charging the sodium hydroxide aqueous solution in the container held in the container holding part into the washing tub;
A washing machine comprising: In the washing machine according to claim 2 or claim 3,
The alkali metal hydroxide introducing device is:
A container holder for holding a container filled with an aqueous sodium chloride solution;
A sodium chloride charging mechanism for charging the sodium chloride aqueous solution in the container held in the container holding part into the washing tub;
A sodium hydroxide aqueous solution generation unit that electrolyzes the sodium chloride aqueous solution introduced by the sodium chloride charging mechanism and generates an aqueous solution containing sodium hydroxide as the alkali metal hydroxide;
A washing machine comprising: The washing machine according to claim 5,
The washing tub includes an outer tub and an inner tub disposed rotatably in the outer tub.
The washing machine, wherein the outer tub is provided with an electrode for electrolyzing the aqueous sodium chloride solution. The washing machine according to claim 6,
When the controller determines that the wash water has fallen below the liquid control region, the controller generates sodium hydroxide by performing electrolysis by passing an electric current through the electrode, A washing machine that performs control to return to a control area. In the washing machine according to claim 2 or claim 3,
The alkali metal hydroxide introducing device is:
A container holder for holding a container filled with an aqueous sodium chloride solution;
The sodium chloride aqueous solution in the container held in the container holding part is electrolyzed to produce an aqueous solution containing sodium hydroxide as the alkali metal hydroxide and put into the washing tub. Generation input part;
A washing machine comprising: In the washing machine according to claim 2 or claim 3,
The alkali metal hydroxide introducing device is:
A sodium chloride addition part for adding sodium chloride,
A sodium chloride aqueous solution generation part for dissolving the sodium chloride of the sodium chloride addition part in water to generate a sodium chloride aqueous solution;
Electrolyzing the sodium chloride aqueous solution to produce an aqueous solution containing sodium hydroxide as the alkali metal hydroxide;
A washing machine comprising: The washing machine according to claim 8 or 9,
The washing tub includes an outer tub and an inner tub disposed rotatably in the outer tub.
Separately from the inner tub and the outer tub, a washing machine comprising an electrolysis tub for electrolyzing the sodium chloride aqueous solution. The washing machine according to claim 10,
The electrolysis tank includes a chlorine gas recovery unit that recovers chlorine gas generated by electrolysis,
A washing machine comprising: a chlorine gas charging mechanism for charging the recovered chlorine gas into rinse water in a rinsing step. The washing machine according to claim 10 or 11,
When the controller determines that the washing liquid has fallen below the liquidity control region, the controller performs electrolysis in the electrolysis tank and adds an aqueous solution containing sodium hydroxide to the washing water. Then, the washing machine is configured to execute control to return to the liquid property control region. The washing machine according to any one of claims 5 to 12,
The said control apparatus performs the discharge process which throws in and discharges | emits the said sodium chloride aqueous solution to the said washing tub after performing a rinse process. The washing machine according to any one of claims 5 to 12,
A tank cleaning member for cleaning the washing tank;
The control device performs a draining process of charging and discharging the sodium chloride aqueous solution into the washing tub after performing a tank cleaning process of cleaning the washing tub with the tank cleaning member. .

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