JP2003052609A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dishwasher which has a compact electrolylic bath of a simple constitution, and can obtain a high tableware washing property without using a detergent. SOLUTION: This dishwasher comprises a washing tank, an electrolylic water generating device, and a washing water feeding means. In this case, the washing tank has a washing water storage section which can house tableware and store washing water. The electrolylic water generating device comprises at least one pair of electrodes. The washing water feeding means sucks in the washing water of the washing water storage section and drains the washing water. In such a tableware washing system, an adding mechanism which adds sodium bicarbonate or sodium carbonate is provided. By the adding mechanism, sodium bicarbonate or sodium carbonate is added to the washing water. Then, washing is performed using the washing water which is electrolyzed by the electrodes set in the water storage section of the washing tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwashing apparatus, and more particularly to a dishwashing method with a high washing effect.

[0002]

2. Description of the Related Art Normally, in a dishwashing apparatus, dishes are stored in a washing tank, tap water or hot water is introduced into the washing tank, and water at the bottom of the washing tank is pumped to a washing nozzle by a pump to wash the dishes. The dirt adhering to the tableware is removed by spraying the wash water vigorously. Dirty water is discharged to the outside. The cleaning process is performed several times to clean the tableware. Further, JP-A-5-137689 describes a method of washing dishes with wash water containing a large amount of hypochlorous acid by providing electrodes in the circulation path of a dishwasher and electrolyzing wash water containing salt. Are

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In 689, only a method of adding salt as an inorganic salt is described. However, when the dishwasher is usually used, since it is heated to a high temperature, hypochlorous acid is released as chlorine, so it is expected that hypochlorous acid has little effect. Further, in the above patent, only the method of applying electrolysis in the second and subsequent washings is shown, but actually, the electrolysis is most efficient even in the first washing, which has a large dirt load, and therefore high cleaning performance is desired. There wasn't. Further, it had a complicated salt addition mechanism for adding salt when electrolysis was performed for the second time. An object of the present invention is to solve the above problems and provide a sanitary dishwashing apparatus having an electrolytic cell that is compact and has a simple structure.

[0004]

In order to achieve the above object, the invention according to claim 1 has a cleaning tank having a cleaning water storage section for storing dishes and storing cleaning water, and at least a cleaning tank. An electrolyzed water generator comprising a pair of electrodes,
In a dishwashing apparatus comprising a wash water supply means for sucking and discharging the wash water in the wash water storage part, an addition mechanism for adding sodium bicarbonate or sodium carbonate is provided, and the sodium bicarbonate or sodium carbonate is added to the wash water by the addition mechanism. Then, the cleaning water is cleaned with the cleaning water electrolyzed by the electrodes installed in the cleaning tank water storage section.

According to the present invention, water obtained by electrolyzing sodium bicarbonate or sodium carbonate can obtain high dishwashing ability without using a detergent, which leads to a reduction in environmental load and a reduction in running cost. In addition, the fractional structure required for producing alkaline water or acidic water is not required, and waste water is also eliminated.

Further, according to the invention of claim 2, in a dishwashing apparatus having a plurality of washing steps, in the washing step in which sodium bicarbonate or sodium carbonate is added as an inorganic salt, the temperature of washing water at the time of washing dishes is 30. It is characterized in that the temperature is set in the range of ℃ to 50 ℃.

According to the present invention, since the effect of increasing the pH of sodium bicarbonate or sodium carbonate can be utilized efficiently to wash dishes, a high washing power can be realized. Further, it becomes possible to prevent the precipitation of the hardness component due to the temperature rising too high.

Further, the invention according to claim 3 is characterized in that in a dishwashing apparatus having a plurality of washing steps, electrolysis is applied during the first washing.

According to the present invention, electrolysis can be efficiently performed at a time when the concentration of added baking soda or sodium carbonate is high, so that high cleaning property can be realized.

Further, the invention according to claim 4 is characterized in that the electrode installed in the cleaning tank water storage part is installed in a removable filter / cover.

According to the present invention, there is no risk of touching the electrode during use, and the user can simply wash the filter after use by simply removing the filter and cover, so that the electrode can be held safely and cleanly. it can.

The invention according to claim 5 is characterized in that the electrode is removable.

According to the present invention, since the user can remove the electrode and wash it, the electrode can be kept cleaner. Further, when the electrode is deteriorated, it can be easily replaced.

Further, the invention of claim 6 is characterized in that the baking soda addition mechanism has a lid structure for opening a part of an upper opening thereof by a water flow.

According to the present invention, the amount of baking soda to be added to the washing water can be controlled with a simple structure, and the baking soda is eluted into the washing water even in the second washing step among the plural washing steps. . As a result, not only the first washing step,
Electrolysis can be performed even in the second and subsequent cleaning steps, and higher cleaning performance can be realized.

The invention according to claim 7 has a front-opening door that opens downward to the front side, and the baking soda addition mechanism is provided on the inside wall surface of the door. Cleaning equipment

According to the present invention, a user can easily supply baking soda.

The invention according to claim 8 is characterized in that a water supply pipe for supplying cleaning water is provided, and an ion exchange resin is provided in the middle of the water supply pipe.

Although the electrolyzed sodium bicarbonate water has good detergency, it has a drawback that the hardness component in the detersive water becomes calcium carbonate and is easily precipitated. Since the hardness component can be removed by the ion-exchange resin, it is possible to prevent deterioration of the cleaning property due to precipitation of the hardness component, and it is possible to sufficiently exert the cleaning effect of electrolyzed sodium bicarbonate water.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In FIG. 1, 1 is a washing tank, 2 is a water supply pipe for supplying washing water for washing dishes to the washing tank 1, 3 is a water supply valve for opening and closing water supply, 4 is a nozzle for injecting washing water for washing dishes And the injection port 5
Is provided. Further, 6 is a washing pump that is a washing water supply means for circulating the washing water, and 7 is a drainage pump that drains the washing water. Reference numeral 8 is a water storage section showing that the water in the cleaning tank is stored, and 9 is an electrode for producing acidic water and alkaline water by electrolyzing the water stored in the cleaning tank water storage section. Reference numeral 10 is a control unit that controls the electrodes, 11 is a harness that connects the electrode 9 and the electrolysis control unit 10, and the electrode 9, the harness 11, and the electrolysis control unit 10 constitute an electrolyzed water generation device 12. Reference numeral 13 is a filter / cover, 14 is a heater for heating washing water, 20 is a basket for storing dishes, and 30 is tableware.

In FIG. 2, reference numeral 22 is an operation start switch, 23 is a cleaning condition selection switch, and these switches are installed on the operation panel 21. 24 is
Reference numeral 25 is an addition mechanism for adding baking soda or sodium carbonate to the washing water, and 25 is a door for sealing the tableware washing device.

Here, the baking soda addition mechanism 24 will be described in detail with reference to FIG. FIG. 3 is an enlarged view of the door 25 of the dishwashing apparatus including the adding mechanism 24. In FIG. 3, 25 is a dishwasher door, 24 is an addition mechanism, 26 is baking soda or sodium carbonate, 27 is a holding plate, 28 is a pocket, and 29 is a support rod. The pocket 28 is fixed to the door 25 by a support rod 29. The user adds powder of baking soda or sodium carbonate from the upper part of the addition mechanism 24. The added powder is held by the holding plate 27 and partially held in the pocket 28. Since the holding plate 27 and the pocket 28 have an overlapping structure, they do not enter the cleaning tank 1 when powdered baking soda or sodium carbonate is added or the door 25 is closed. When washing is started in this state, washing water enters from the upper part of the addition mechanism 24 to dissolve the powder of baking soda or sodium carbonate and flow into the washing tank 1. In this way, the addition mechanism 2
By adding sodium bicarbonate or sodium carbonate according to 4,
The baking soda can be supplied to the cleaning tank 1 at the same time when the cleaning is started. In addition, the addition mechanism 24 may be configured so that a prescribed amount of inorganic salt can be automatically added. In that case, a method in which the user adds it to the addition mechanism every time, or several times baking soda or sodium carbonate are added at once. There is a method of automatically controlling the amount added to the mechanism and added to the cleaning tank.

The operation of this embodiment will be described in detail with reference to FIGS. The user places the dishes 30 on the dish basket 20 and sets them in the washing tank 1, and then sets baking soda or sodium carbonate in an appropriate amount in the addition mechanism 24. When the user presses the operation start switch 22, the water supply valve is opened and tap water or hot water obtained by heating the tap water is supplied from the spout 2 to the cleaning tank 1, and the cleaning water is stored in the water storage section 8. After a predetermined amount of washing water is stored in the washing tank, the washing pump 5 is driven and the washing water is jetted from the jet port 4 of the nozzle 3 to the dishes to wash the dishes.
The sprayed cleaning water not only cleans the dishes but also applies to the adding mechanism 22, so that baking soda or sodium carbonate is eluted into the cleaning water as described above. At this time, a voltage is applied between the electrodes 9 to perform electrolysis, and cleaning is performed while enhancing the cleaning property of the cleaning water. After washing the dishes for a certain period of time, the washing pump 5 is stopped, the drainage pump 6 is driven to drain the dirty washing water, and the first washing step is completed. In the second and subsequent cleaning steps, the same operation is performed without electrolyzing the cleaning water, the tableware cleaning sequence ends, and then the tableware drying sequence is performed to complete the cleaning cycle. By thus providing the electrodes in the cleaning tank water storage section 8 in the cleaning tank, electrolyzed water can be obtained in the process of circulating the cleaning water for cleaning the dishes, and the step of separating the cathode water and the anode water is required. Disappear.

First, the case of using baking soda as the inorganic salt will be described. Conventionally, sodium bicarbonate water to which sodium bicarbonate has been added has been used as a pipe cleaning agent, and is known to have a high cleaning property for organic substances such as slime. It is considered that the reason is that it is weakly alkaline and that it is foamable to generate carbon dioxide gas. However, simply adding sodium bicarbonate to water does not raise the pH so much, and the cleaning effect on tableware is not so high, but by further electrolyzing the water containing sodium bicarbonate to make the pH more alkaline, the cleaning power is further enhanced. Can be increased.

Next, the pH of the sodium bicarbonate solution is electrolyzed.
The reason why is increased will be described in detail using a chemical reaction formula. In the usual electrolysis of water, the reaction (1) occurs on the cathode side, the cathode water becomes alkaline, the reaction (2) occurs on the anode side, and the anode water becomes acidic. Therefore, in order to obtain alkaline cleaning water, it is necessary to separate the cathode water and the anode water, and in this system where the cleaning tank is only equipped with an electrode, the cathode water and the anode water are mixed, so the neutral water I could only get electrolyzed water. ^{_{2H 2 O + 2e - → H}} 2 + 2OH - ... (1) 2H 2 O → O 2 + 4H + + 4e - ... (2)

When the sodium bicarbonate water is electrolyzed, a reaction such as (1) occurs on the cathode side as in the electrolysis of water, and the cathode water becomes alkaline, but on the anode side, unlike the electrolysis of water (2). Since the reaction of (3) occurs simultaneously with the reaction of (3), the anode water is prevented from becoming acidic. Also in this system in which the cathode water and the anode water are mixed, alkaline cleaning water can be obtained. NaHCO ₃ + H ⁺ → Na ⁺ + H ₂ O + CO ₂ ↑ ... (3)

When the baking soda electrolyzed water is heated, the reaction (4) occurs and the pH rises. As a result, when the baking soda electrolyzed water is used in a dishwasher, the washing water is heated by the heater, and the synergistic effect with electrolysis makes it possible to obtain alkaline washing water having a higher pH. NaHCO ₃ → Na ⁺ + OH ⁻ + CO ₂ (4)

Further, when the alkaline water obtained by electrolysis of water is used, if the fouling load is large, the washing water immediately returns to neutral and the washing power is lowered.
However, the sodium bicarbonate solution has an equilibrium represented by the formula (5). When the acid is added, the equilibrium moves to the left, and when the alkali is added, the equilibrium moves to the right, and thus has a buffering effect. Therefore, even if the dirt load is somewhat large, the washing water does not become neutral or acidic immediately, and the washing power can be maintained to the end. H ₂ O + CO ₂ ⇔ H ⁺ + HCO ₃ ⁻ ⇔ 2H ⁺ + CO ₃ ² -... (5)

From the above results, when sodium bicarbonate is added to water, the pH is about 8.4 even if the maximum amount of solubility is added, but the pH can be increased to about 10 by electrolyzing this water. It is also possible to maintain the pH. Further, as shown in the formula (3), carbon dioxide is generated during the electrolysis of the sodium hydrogen carbonate solution, which has the effect of floating the dirt and peeling it off, so that the cleaning power can be further enhanced. It can be seen that such water cannot be obtained only by adding baking soda, but can be obtained only by electrolysis.

Next, FIGS. 4 and 5 show the results of evaluation of detergency when actually baking soda was added and electrolysis was performed in the deterging tank.
In the experiment method, a slide glass of 26 × 76 mm was used as a base material, an egg was used as a representative of protein stain, rice was a representative of starch stain, and lard was a representative of oil stain. Whole eggs were used and stirred with a mixer for about 15 seconds.
The total amount of 07 g was applied to one side of the slide glass. For the rice, use commercially available retort-type rice, heat it in a microwave oven, add water to the regular rice-shaped rice, and heat it in a microwave oven to make porridge. Create a paste-like stain by stirring and add 0.1
g was applied over one side of the slide glass. Lard uses commercially available lard and is heated in a microwave oven,
A liquid stain was prepared and 0.1 g was applied over one side of the slide glass. After applying the stain, it was dried by a dryer at 40 ° C. for about 2 hours and washed. For washing, a commercially available dishwasher (EUD300 manufactured by Totoki Co., Ltd.) was provided with electrodes, and a dishwasher basket fixed vertically with a pin was washed using an ordinary washing course. In addition, seven slides were used for each washing, and the error between slides was included in the examination. The evaluation was performed using the glossiness (%) that can be measured with a glossiness meter. The glossiness was measured at 5 points per slide glass, and the average was taken as the glossiness of the slide glass. The same 5 points were measured on all slide glasses.

As a result, it was found that eggs and rice have a higher cleaning effect than hot water cleaning. The results of the detergency test performed using egg stains are shown below. First, FIG. 4 shows the results when the above-described test was repeated 4 times by changing the conditions of the wash water. However, the value is an average value because seven slide glasses are used in one test. As a result, comparing tap water (normal temperature) and baking soda electrolyzed water (tap water, room temperature), the cleaning properties are improved due to the effect of sodium bicarbonate electrolysis water.
It was shown that the cleanability was improved. However, when the baking soda electrolyzed water (tap water, high temperature), which is the result of cleaning at high temperature using electrolyzed baking soda, the detergency is significantly reduced. Also, when comparing water (tap water, room temperature) and water (tap water, high temperature), the washability does not change much. Therefore, if the temperature is raised, a unique reaction occurs when using sodium bicarbonate electrolyzed water, and the washability is improved. It turned out to drop. However, the baking soda electrolyzed water (pure water, high temperature), which is the water generated by the water from which the hardness component has been removed, had the highest gloss level even though it was washed at high temperature. From these results, it was suggested that the washability is lowered when the temperature is too high when using the electrolyzed sodium hydrogen carbonate, and the reason is that the hardness component in the tap water is greatly involved. However, in this test, the high temperature means a cleaning temperature of about 55 ° C., and the normal temperature means water which is not temperature-controlled, and is about 20 ° C.

As described above, the description will be made within a range that can be estimated as a factor in which the hardness component exerts a greater influence when electrolysis water of sodium bicarbonate is used. Normally, when heat is applied to tap water, a reaction as shown in formula (6) occurs, and calcium carbonate, which is a cause of scale, is deposited, but in sodium bicarbonate water, HCO ₃ ⁻
There is more water than tap water, so the reaction of formula (6) is more likely to occur, and the pH of the wash water is higher due to electrolysis, so the It is expected that the effect of precipitation will appear more prominently. Therefore, it is considered that if the temperature is raised too high, the cleaning property deteriorates. Ca (HCO ₃ ) ₂ → CaCO ₃ ↓ + H ₂ O + CO ₂ ↑ ... (6)

Therefore, how much the temperature of the washing water should be raised
Does the reaction of formula (6) occur and adversely affects the cleanability?
In order to investigate, investigate the temperature dependence of the residual amount of hardness component,
It is shown in FIG. The test method is as follows:
, Heat with stirring, and after reaching the specified temperature,
The hardness after standing for 10 minutes was measured. As a result, in hardness component
Ca2 + concentration of syrup decreases sharply above 50 ℃
I understand, HCO _Three ⁻The concentration of Ca²⁺Same as the concentration of
As shown in the figure, when the temperature exceeds 50 ° C, Ca
²⁺Suggest that it will precipitate as calcium carbonate
Was done. Therefore, when using sodium bicarbonate electrolysis water for cleaning
Is desirably controlled to 50 ° C. or lower.

Further, FIG. 6 shows the results of examining the temperature dependence of the cleaning property when the electrolysis water of sodium bicarbonate was used, by using the BL cleaning test method. However, the BL cleaning test method is a cleaning test method made based on the BL standard indicated by Better Living. The types of stains include proteins, starches, and fats and oils comprehensively, and are specifically curry, ham eggs, pork cutlets, miso soup, rice, milk, tomato juice, and tea. For the evaluation, visually divide each tableware into three stages of A, B, and C,
The cleaning rate (%) was obtained by dividing the score when A was 2 points, B was 1 point, and C was 0 points by the tableware score multiplied by 2. In other words, 100% is given to all A evaluations, and 0% is given to all C evaluations. The base material is actual tableware, and B
The shape and size determined by the L standard were selected and used. As a result, it was found that the cleaning rate was extremely poor at the cleaning temperature of 20 ° C. (normal temperature), and the cleaning rate was high at the cleaning temperature of 30 ° C. or higher. This result is considered to be because when the temperature is lowered, the ability to elute the dirt in the wash water and the ability to clean up the dirt become extremely low. Also, 55 ℃
On the other hand, the cleaning rate decreases during cleaning, which is presumably due to the precipitation of hardness components. In fact, it was confirmed that a lot of white powdery stains, which are considered to have deposited hardness components, remained on the tableware washed at 55 ° C.

Based on the above results, from the viewpoints of both improving the cleaning property by increasing the temperature and preventing the precipitation of hardness components when using sodium hydrogen carbonate electrolyzed water, cleaning at a temperature of 30 ° C. or higher and 50 ° C. or lower is possible. desirable.

Therefore, the operation flow of the baking soda cleaning will be described in detail with reference to the flowchart of FIG. When the user presses the operation start switch (S1), the cleaning process starts (S
2). With the start of the cleaning process, the counter is started (S3) and the temperature sensor is turned on (S4). At this time, if it is a cleaning process using sodium bicarbonate electrolysis water (S5Ye
s), electrolysis is started (S7), and the sodium bicarbonate cleaning temperature is controlled (S8). If it is not the first cleaning step (No in S5), normal temperature control is performed (S6). Normal temperature control is equivalent to temperature control when a detergent is used. When the counter times up both when using sodium bicarbonate electrolysis water and during normal cleaning (S9), the cleaning process ends.

Next, the baking soda washing temperature control will be described in detail with reference to the flowchart of FIG. In a dishwasher using ordinary detergent, the temperature is controlled to be kept below 60 ° C in order to prevent the temperature from deteriorating the protein during the first washing, and in the final washing step, sterilization and oil stain It is heated above 60 degrees for removal. But,
In controlling the baking soda washing temperature, it is important to control the temperature to 50 ° C. or lower in order to prevent precipitation of hardness components as described above. First, when the cleaning temperature is lower than 50 ° C. (S50 Yes), the heater is turned on (S51), and when the cleaning temperature is 50 ° C. or higher (S50 No).
The heater is turned off (S53). Further, the heater is turned on (S51), and when the temperature reaches 50 ° C. or higher (S52 Yes), the heater is turned off (S53). By performing such temperature control in the washing step using sodium bicarbonate electrolyzed water, it is possible to prevent the washability from being deteriorated due to the temperature being too low, and to prevent the precipitation of the hardness component due to the temperature being too high. be able to.

Further, the larger the amount of baking soda added, the higher the cleaning property, but even if a certain amount or more is added, the effect of increasing the pH is small, so addition of 1 wt% is sufficient.
In order to add 1 wt%, the user adds about 30 g to the above-mentioned addition mechanism to obtain about 1 wt%, and it is desirable to change the added amount according to the amount of stains on the tableware.

Next, the case where sodium carbonate is added as an inorganic salt will be described. Sodium carbonate is more alkaline than sodium bicarbonate when dissolved in water. Further electrolysis causes a reaction similar to that of an aqueous solution of sodium bicarbonate, and can further raise the pH. As a result, a strong detergency is exhibited especially against organic contaminants.

Next, the electrode forming conditions such as the distance between electrodes and the electrode area and the electrolysis conditions will be described in detail. Conventionally, when alkaline water is generated by electrolysis of water and used for cleaning, it is necessary to separate the cathode water and the anode water, and when separating in an electrolytic cell without a membrane, the distance between electrodes is as short as 0.5 to 1 mm. Had to be in the distance. However, in this system, it is not necessary to separate the cathode water and the anode water, and if the distance between the electrodes is shortened too much, dirt easily clogs and it is difficult to remove the dirt once attached. There is a need. However, if the inter-electrode distance is too wide, it is necessary to increase the voltage in order to pass a certain amount of current, so it is desirable to set the inter-electrode distance to about 5 cm to 10 cm. Further, the larger the electrode area, the smaller the voltage at a constant current, but there is a problem that the electrode itself becomes large and becomes an obstacle. As a result, the electrode area is 40
It is desirable to set it to about 0 to 10000 mm ² .

In addition, when the cleaning is performed a plurality of times at the timing of applying electrolysis, the first cleaning has a large load of dirt, so that electrolysis has a great effect on the cleaning performance, and further the first cleaning is performed. Has the highest inorganic salt concentration, and a complicated inorganic salt addition mechanism is required to increase the concentration of the added inorganic salt in the second and subsequent washings. Therefore, electrolysis is performed during the first washing. Best to call. However, in a normal dishwasher, 100% of water is not replaced, and a small amount of residual water remains in the dishwasher. Therefore, baking soda remains in the second and subsequent washings. Therefore, it is possible to improve the cleaning property by electrolyzing not only the first cleaning step but also the second and subsequent cleaning steps.

However, during the second and subsequent washings, the amount of baking soda initially added will vary depending on the usage conditions.
There is a risk of unnecessary electrolysis even if baking soda does not remain. Where the electrolysis is most effective during the baking soda washing process will be described with reference to the flowchart of FIG. After starting the dishwasher operation, start electrolysis,
The resistance value calculated from the voltage value between electrodes and the current value is monitored. When the resistance value is equal to or higher than the specified value, it means that the inorganic salts necessary for electrolysis are gone, and when the resistance value is equal to or higher than the specified value, electrolysis is stopped. Further, in the final rinsing step, it is better not to perform cleaning with electrolytic water in order to prevent corrosion in the sink. Therefore, in the final rinsing step, it is desirable to stop electrolysis even if the resistance value is equal to or less than the specified value. As a result, wasteful electrolysis can be prevented and electrolyzed water can be efficiently generated.

Next, the position where the electrode is provided will be described.
In FIG. 1, 13 is a filter / cover. The electrode for electrolyzing the wash water is installed under the filter / cover 13 and the wash water is used as the dirty filter / cover 1.
Since it is sucked by the cleaning pump 5 through the cleaning pump 3, cleaning water from which large contaminants in food stains have been removed flows near the electrodes, and large contaminants do not adhere to the electrodes or large contaminants are not clogged between the electrodes. In addition, since it is stored under the dirt filter / combined cover 13, even in the unlikely event that the user cannot directly touch it during energization. Since it is installed at a position where it is easily exposed by removing the dirt filter / combined cover 13, the electrodes and the like can be easily cleaned by removing the dirt filter / combined cover 13.

Next, a second embodiment will be described in detail with reference to the accompanying drawings. In this embodiment, the electrodes can be removed so that the user can easily perform maintenance. In FIG. 10, reference numeral 80 denotes an electrolytic cell, which has a structure integrated with the water conduit 81. The electrolytic cell 80 will be described in detail with reference to FIG. 11 which is an enlarged view. In FIG. 11, reference numeral 202 is a lid, 203 is an electrode, and 20
Reference numeral 1 is a convex portion having a screw structure, 200 is a concave portion having a screw structure, and 204 is a power feeding portion. Since a part of the water conduit 81 is a lid 202 that can be opened and closed, and 200 and 201 have a pair of screw structures, a part of the water conduit can be removed by rotating. By providing an electrode on the lid, the electrode can be removed together with the lid of the water conduit. Further, when the power feeding unit is provided on the opposite side of the water conduit from which the lid is provided, and the lid 202 is closed with the electrode 203 provided, the electrode 203 comes into contact with the power feeding unit 204, and a structure capable of conducting electricity is obtained. ing.

The third embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Similar to FIG. 1, FIG. 12 is an example of a tableware washing device that performs washing with wash water obtained by electrolyzing water added with baking soda using an electrode provided in a water storage section. A lid 42 rotatable about the center is provided. FIG. 13 is an enlarged perspective view of the addition mechanism 40. By pushing the front side 42a of the lid, the back side 42b of the lid is raised, and the upper part is easily opened, so that the user can easily add sodium bicarbonate or sodium carbonate. Addition mechanism 40
It can be thrown in. Also, when cleaning starts,
The washing water hits the lid 42 and rotates around the support column 41, and a part of the washing water enters the inside of the addition mechanism 40, and baking soda or sodium carbonate added therein is eluted into the washing tank 1. As a result, it becomes possible to limit the amount of wash water entering the addition mechanism 40 as compared with the case where the lid 42 is not provided, and the baking soda is not completely eluted in the first washing step, and the baking soda is retained until the intended washing step. It is a thing. Since the amount of organic substances attached to the dishes is too large in the first washing step, it is difficult to remove all the organic substances only by the first washing.
Therefore, the baking soda is configured to remain until the second and subsequent times, and is also configured to be electrolyzed after the second and subsequent times when the amount of organic matter has decreased to some extent. As a result, the electrolyzed water can be applied to the surface of the tableware after the second washing step, where a very small amount of organic matter that is hard to be removed remains, and a high degree of cleanliness of the tableware can be realized. The lid 42 is configured to be rotatable up and down around the support column 41, so that when the lid 42 is raised, baking soda can be easily added. This makes it possible to add baking soda to the second and subsequent electrolysis with a simple mechanism. The lid 42 does not have to be particularly movable, but by making it movable, it is possible to improve workability and cleanability when adding baking soda.

A fourth embodiment of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 12, 250 is a door for sealing the cleaning tank, and 251 is a baking soda holder. The structure of the baking soda holder 251 is the same as that of the baking soda holder described above, but since the baking soda holder 251 is provided in the front opening door, when the user opens the door, the baking soda can be added more easily.

The fifth embodiment of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 13, 100 is a cation exchange resin and 101 is a three-way valve. The cleaning water supplied from the water supply valve 3 can be branched by the three-way valve 101 and directly supplied to the cleaning tank 1.
It is also possible to reach the cleaning tank 1 through 00. Usually, precipitation of hardness component is a problem because it is a washing step with sodium hydrogen carbonate electrolysis water, so considering the life of the cation exchange resin,
It is desirable to pass the cation exchange resin only during the baking soda washing process. Also, the type of cation exchange resin is hydrogen type,
There are two types of sodium type, but when it is hydrogen type, it becomes weakly acidic after passing through the cation exchange resin and the washing property is deteriorated. Therefore, it is desirable to use Na type which does not change the pH.

If 90% or more of the hardness component is removed,
Since it is sufficient to prevent the precipitation of hardness components, the time when 90% or more is not removed is considered to be the life, and the amount of tap water that can pass before reaching the life is examined. As a result, it was found that about 1000 times as much water as the capacity of the cation exchange resin can be passed through when the tap water is used before it reaches the end of its life. The size suitable for incorporation into the dishwasher is about 200cm ³ ~600cm ^3, 400cm ³
Then, it becomes possible to pass 4000 liters of water. As a result, assuming that the washing water from which hardness components have been removed is used only once in a washing process using sodium bicarbonate electrolysis water, it will be necessary to replace or regenerate the cation exchange resin in about 4 months. .

After the hardness component in the cleaning water is removed, it is supplied to the cleaning tank 1. After that, baking soda is added to the water from which the hardness component has been removed, and the dishes are washed with the washing water obtained by electrolysis. As a result, it becomes possible to prevent the deterioration of the cleaning property due to the precipitation of hardness components as described above.

FIG. 15 shows a sixth embodiment of the present invention.
Unlike the first embodiment, the electrode 9 is an example installed on the downstream side of the cleaning pump 12 in the cleaning water circulation path. By installing the washing pump 12 on the downstream side, the time from the electrolysis near the electrodes to the action on the surface of the dishes can be shortened, and more active electrolytic washing water can be applied. .

EFFECT OF THE INVENTION By adding a baking soda mechanism and an electrode,
The pH of the washing water can be increased without the complicated structure such as the separation process, which was required during the alkaline washing.
Not only that, we were able to realize a dishwasher with high washability due to the unique cleaning effect of sodium bicarbonate electrolysis water.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a first embodiment of the present invention.

FIG. 2 is an external oblique view showing the first embodiment of the present invention.

FIG. 3 is an enlarged view of the addition mechanism of the present invention.

FIG. 4 is a graph showing detergency with various kinds of washing water.

FIG. 5 is a graph showing the temperature dependence of the residual amount of hardness component of tap water.

FIG. 6 is a graph showing the temperature dependence of the detergency during the sodium bicarbonate electrolysis water cleaning of the present invention.

FIG. 7 is a flowchart showing an operation flow of the present invention.

FIG. 8 is a flow chart showing a control flow of temperature control during baking soda washing according to the present invention.

FIG. 9 is a flow chart showing a control flow of electrolysis in a cleaning process using sodium bicarbonate electrolysis water of the present invention.

FIG. 10 is a front sectional view showing a second embodiment of the present invention.

FIG. 11 is a schematic cross-sectional view of an electrolytic cell portion of the second embodiment of the present invention.

FIG. 12 is a front sectional view showing a third embodiment of the present invention.

FIG. 13 is an enlarged perspective view showing an addition mechanism of the present invention.

FIG. 14 is a front sectional view showing a fourth embodiment of the present invention.

FIG. 15 is a front sectional view showing a fifth embodiment of the present invention.

FIG. 16 is a front sectional view showing a sixth embodiment of the present invention.

[Explanation of symbols]

1 ... Cleaning tank 2 ... Water pipe 3 ... Water supply valve 4 ... Nozzle 5 ... Injection port 6 ... Washing pump 7 ... Drainage pump 8 ... Water storage 9 ... Electrode 10 ... Electrolysis control unit 11 ... Harness 13 ... Cover that also serves as a filter 14 ... Heater 20 ... basket 24 ... Addition mechanism 25 ... Door 26 ... baking soda or sodium carbonate 27 ... Holding plate 28 ... Pocket 29 ... Support rod 30 ... Tableware 40 ... Inorganic salt holder 41 ... Prop 42a ... in front of the lid 42b ... the back of the lid 80 ... Electrolyzer 81 ... Headrace 100 ... Ion exchange resin 101 ... Three-way valve 200 ... screw recess 201 ... screw protrusion 202 ... Lid 203 ... Electrode 204 ... Power supply unit 250 ... Door 251 ... Addition mechanism

Continued front page    (72) Inventor Aiko Mitsu             2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City, Fukuoka Prefecture             No. Totoki Equipment Co., Ltd. F-term (reference) 3B082 BD01 BG01 CC01 CC03                 4H003 DA19 EA16

Claims (8)

[Claims] 1. A cleaning tank having a cleaning water storage unit that stores dishes and can store cleaning water, an electrolyzed water generating device including at least one pair of electrodes, and suctioning the cleaning water in the cleaning water storage unit. In a dishwashing apparatus comprising wash water supply means for discharging water, an addition mechanism for adding sodium bicarbonate or sodium carbonate is provided, and sodium bicarbonate or sodium carbonate is added to the wash water by the addition mechanism, and the wash water is stored in the washing tank water storage section. A dishwasher, which is washed with wash water electrolyzed by the electrode installed in the. 2. In a dishwasher having a plurality of washing steps, the temperature of washing water at the time of washing dishes is 30 ° C. or more and 50 ° C. or less in the washing process in which sodium bicarbonate or sodium carbonate is added as an inorganic salt. The tableware washing device according to claim 1, wherein: 3. The dishwashing apparatus according to claim 1 or 2, wherein in the dishwashing apparatus having a plurality of washing steps, electrolysis is applied during the first washing. 4. The electrode installed in the water tank of the cleaning tank,
The dishware washing apparatus according to any one of claims 1 to 3, wherein the dishware washing apparatus is installed in a removable filter / cover. 5. The dishware washing apparatus according to claim 1, wherein the electrode is removable. 6. The tableware washing device according to claim 1, wherein the baking soda addition mechanism has a lid structure that opens a part of an upper opening of the baking soda mechanism by a water flow. 7. The tableware washing device according to claim 6, further comprising a front opening door that opens downward to the front side, and the baking soda addition mechanism is provided on the inner wall surface of the door. 8. The tableware cleaning device according to claim 1, further comprising a water supply pipe for supplying the cleaning water, and an ion exchange resin provided in the middle of the water supply pipe.