JP4241165B2 - Dishwasher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dishwasher using oxygen-enriched wash water.
[0002]
[Prior art]
Conventionally, this type of dishwasher has a washing course as shown in FIG. 9 (see, for example, Patent Document 1). Hereinafter, the cleaning will be described.
[0003]
As shown in FIG. 9, in a dishwasher that performs washing without introducing a dedicated detergent, the temperature of the main washing process is changed to two stages of 40 degrees and 55 degrees to heat the washing water. The dirt attached to the tableware and the like was removed by the cleaning power by mechanical power and heat energy.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-204676
[Problems to be solved by the invention]
However, as shown in FIG. 9, the conventional dishwasher-free course has a main washing process or a pre-washing process in which the washing time is increased and the washing temperature is changed to several stages. Although operations such as removing large stains in advance are performed, there is a problem that satisfactory cleaning performance cannot be obtained for protein stains, oil stains, protein-oil composite stains, etc., because no detergent is used. It was.
[0006]
The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a dishwasher / dryer capable of obtaining satisfactory cleaning performance against major tableware stains such as protein stains.
[0007]
[Means for Solving the Problems]
In order to solve the conventional problems, the dishwasher of the present invention includes a washing tank for storing washing water, a washing pump for pressurizing washing water, and an oxygen-enriched gas having an oxygen concentration higher than air in the washing water. An oxygen-enriched gas addition means for dissolving, a water level detection means for detecting a cleaning water level stored in the washing tank by a float, a water level detection side path communicating with the oxygen-enriched gas addition means and the water level detection means, and A second electromagnetic on-off valve is provided in the middle of the water level detection side path, and in the final rinsing step, the second electromagnetic on-off valve is opened and oxygen is added to the cleaning water in the water level detection means by the oxygen-enriched gas addition means. The enriched gas is dissolved.
[0008]
As a result, part of the oxygen dissolved in the wash water in the water level detection means becomes active oxygen with high oxidizing power and is dissolved in a high concentration in the wash water, and promotes oxidative decomposition of proteins, etc., which are major dish stains. In addition, it is possible to prevent dirt such as protein and starch from adhering to the inner wall of the water level detection means, and to dissolve the oxygen-enriched gas in the washing water in the water level detection means during the final rinsing process. At times, since there are few dirt components in the washing water, the generated active oxygen can be made to work to the maximum extent in removing dirt such as protein and starch adhering to the inner wall of the water level detection means. Therefore, high operational reliability of the water level detection means can be obtained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, there is provided a cleaning tank for storing cleaning water, a cleaning pump for pressurizing the cleaning water, and an oxygen-enriched gas addition for dissolving an oxygen-enriched gas having a higher oxygen concentration in the cleaning water. Means , a water level detecting means for detecting the cleaning water level stored in the cleaning tank by a float, a water level detecting side path communicating with the oxygen enriched gas adding means and the water level detecting means, and in the middle of the water level detecting side path A second electromagnetic opening / closing valve, and opening the second electromagnetic opening / closing valve during the final rinsing step so that the oxygen-enriched gas is dissolved in the wash water in the water level detecting means by the oxygen-enriched gas adding means. As a result, some of the oxygen dissolved in the wash water in the water level detection means becomes active oxygen with high oxidizing power and dissolves in the wash water at a high concentration, so that proteins that are the main dish stains, etc. Oxidative decomposition of Unlike the inside of the washing pump, etc., the washing water flow is gentle and dirt can be deposited. The enriched gas is dissolved in the washing water in the water level detection means, and since there are few dirt components in the washing water during the final rinsing process, the generated active oxygen is attached to the inner wall of the water level detection means such as protein and starch. It can be used to maximize the removal of dirt. Therefore, high operational reliability of the water level detection means can be obtained without causing dirt to accumulate between the inner wall of the water level detection means and the float and causing the float to adhere to cause malfunction.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
(Example 1)
As shown in FIG. 1, a main body 20 of the dishwasher is provided with a washing tub 22 that can be opened and closed by a door 21, and an object to be cleaned 23 such as tableware is set in a tableware basket 24 and accommodated in the washing tub 22. ing. A cleaning pump 26 pressurizes the cleaning water in the cleaning tank 22 supplied via the water supply valve 25. The cleaning water is supplied to a cleaning nozzle (cleaning means) 27 provided with a plurality of injection holes, and the cleaning nozzle 27 performs cleaning. Spray water. The cleaning nozzle 27 is installed below the tableware basket 24 and includes about 4 to 10 injection ports 28 for injecting cleaning water. The cleaning nozzle 27 rotates around the axis by the jet and then injects the cleaning water toward the tableware. .
[0012]
The bottom of the cleaning tank 22 has a drain port 29 communicating with the suction side of the cleaning pump 26. The drain port 29 is provided with a residue filter 30 for collecting residue and a heating element 10 for heating. A temperature sensor 31 for detecting the temperature of the tank 22 is provided. The drainage pump 32 discharges the cleaning water in the cleaning tank 22. The blower 33 sends air to the cleaning tank 22 through the blower path 34 and discharges the exhaust from the exhaust port 35. The water level detection means 36 is a float type and communicates with the drain port 29 and operates so that the water supply valve 25 is closed when a certain amount of cleaning water is accumulated in the cleaning tank 22.
[0013]
In the discharge path 37 of the cleaning pump 26, oxygen-enriched gas adding means 38 is installed to supply and dissolve high-concentration oxygen in the cleaning water. This oxygen-enriched gas adding means 38 is shown in FIG. It has the structure shown. The oxygen storage tank 41 storing the high oxygen concentration gas has a first path 40 (hereinafter referred to as “pump side”) between a dissolved portion 39 (hereinafter referred to as “spout port”) provided in the discharge path 37 of the cleaning pump 26. The first electromagnetic on-off valve 42 and a check valve 43 that prevents the cleaning water from entering from the cleaning pump 26 are provided in the middle.
[0014]
Similarly, the oxygen storage tank 41 communicates with the water level detection device 36 through a water level device side path 44, and a second electromagnetic switching valve 45 is provided in the middle thereof. The water level detection device 36 is open to the atmosphere, and since the washing water does not flow back to the oxygen storage tank 41 side, no check valve is provided. The oxygen-enriched gas adding means 38 includes an oxygen storage tank 41, a first electromagnetic on-off valve 42, and a check valve 43.
[0015]
FIG. 3 is a conceptual diagram of the operation of the dishwasher, in which the horizontal axis indicates the operation time, and the vertical axis indicates the washing water temperature of each process.
[0016]
In the above configuration, first, the basic operation of the dishwasher will be described. An object to be cleaned 23 such as tableware is set in the tableware basket 24 and stored in the cleaning tank 22, the opening of the main body 20 of the tableware washing machine is closed by the door 21, and the operation is started. A pre-washing process for removing large dirt on the object to be cleaned 23 in advance, a main washing process for removing dirt remaining on the tableware, a rinsing process for pouring the attached detergent and residual vegetables, and water adhering to the object to be cleaned 23 Perform in order of the drying process to dry the suitable. In FIG. 3, the prewashing process is indicated by a solid line and a wavy line, but the solid line is a case of prewashing by heating the wash water, and is a prewashing method effective for promoting the removal of oil stains.
[0017]
The wavy line indicates a case of pre-washing without a heater, and is an effective pre-washing method when dirt is removed only by mechanical force of washing water such as vegetable dirt and water-soluble dirt. In particular, in the case of a detergent-less course, the pre-washing process for removing dirt previously adhered to the tableware is an effective process for improving the dirt removing performance in the subsequent main washing process.
[0018]
After the pre-washing process is completed, the water supply valve 25 is operated to supply a predetermined amount of cleaning water to the cleaning tank 22, then the cleaning water is pressurized by the cleaning pump 26, and the cleaning water is jetted from the cleaning nozzle 27. At this time, a heating element 46 such as a sheathed heater provided in the cleaning tank 22 is energized, and the main washing process is performed while heating the cleaning water. The temperature sensor 31 detects the temperature of the cleaning tank 22 and stops energization of the heating element 46 when the temperature exceeds a predetermined temperature.
[0019]
The cleaning water passes through the residual filter 30 and is sucked into the cleaning pump 26, supplied from the cleaning pump 26 to the cleaning nozzle 27 provided in the cleaning tank 22, and sprayed into the cleaning tank 22, thereby cleaning the object 23 to be cleaned. After washing, it circulates along a route that returns to the drain 29 again. At this time, the residue or the like dropped from the object to be cleaned 23 flows into the residue filter 30 together with the cleaning water, and the residue having a size that cannot pass through the residue filter 30 is collected by the residue filter 30.
[0020]
When the main washing process for a predetermined time is finished, the washing water containing dirt is discharged out of the apparatus by the drain pump 32, and the washing water is newly supplied. The washing pump 26 is operated, and washing water is again sprayed from the washing nozzle 27 to rinse the article 23 to be washed, such as detergent and leftovers. After the operation for a predetermined time, the operation of discharging the cleaning water and supplying the cleaning water again is repeated, and this rinsing process is continuously performed about three times. And the final rinse performs the high temperature rinse which heated the wash water to about 70 degreeC, and finally discharges wash water outside the apparatus and the rinse process is complete | finished.
[0021]
Subsequently, by performing a drying process and operating the blower 33, the outside air is blown into the cleaning tank 22 through the blower path 34 and is discharged from the exhaust port 35. At this time, the heating element 46 is energized, and evaporation of water droplets adhering to the object to be cleaned 23 is promoted by the effects of both air blowing and temperature. These drying steps are performed for a predetermined time, and the operation is terminated.
[0022]
Next, the operation and action of the oxygen-enriched gas adding means 38, which is a characteristic configuration of the present embodiment, will be described. As shown in FIGS. 1 and 2, when the main washing process is started and the cleaning pump 26 is started, the on-off valve (not shown) of the oxygen storage tank 41 and the first electromagnetic on-off valve 42 are opened, and the high oxygen concentration gas Is ejected from the ejection port 39 to the discharge path 37. Since the generated active hydrogen decreases every time it reacts with dirt, the high oxygen concentration gas operates so as to be supplied intermittently and continuously from the oxygen storage tank 41. In addition, a check valve 43 is provided in the pump side path 40 to prevent water from entering the oxygen storage tank 41 side from the cleaning pump 26.
[0023]
The ejected oxygen becomes bubbles and dissolves in the cleaning water. A part of the dissolved oxygen is changed to active oxygen (oxygen radical) having high oxidizing power and high reactivity. And the intermolecular bonds of the molecules that make up the dirt, protein, starch, fats and oils of tableware are decomposed by the oxidation reaction by reacting with active oxygen, weakening the binding force and easy to be removed from the tableware. .
[0024]
Further, by providing the ejection port in the discharge path of the washing pump, as much of the generated active oxygen as possible can be reacted with the dirt adhering to the tableware. This is because active oxygen is rich in reactivity. For example, if a spout is brought near the residue filter, it reacts with dirt collected in the residue filter before reacting with dirt attached to the tableware. It is because it ends up.
[0025]
In addition, by providing a jet outlet in the discharge path of the cleaning pump, air stagnation due to bubbles in the cleaning pump is avoided, and the cleaning pump capacity is not reduced.
[0026]
Subsequently, a rinsing process is performed to remove dirt adhering to the tableware, the washing tank, and the like. At this time, a high oxygen concentration gas is dissolved in the washing water. The action of active oxygen has a function of weakening intermolecular binding force against dirt and facilitating peeling from dishes, but also has an effect of destroying bacterial cell membranes by oxidation. This effect can kill cells present in the soil. That is, a sterilization effect can also be obtained.
[0027]
For this reason, bacteria dissolved in tableware, a washing tank, washing water, etc. can be sterilized by dissolving high oxygen concentration gas in a rinse process.
[0028]
In addition, since the active oxygen disappears by reacting with the soil components, the high oxygen concentration gas is continuously supplied during the main washing or a large amount of high oxygen concentration gas is supplied once or several times. There is a need. That is, the cleaning performance can be obtained by supplying the absolute necessary amount of active oxygen with respect to the contamination amount in the main cleaning step.
[0029]
Further, in the examples of the present invention, it has been described that a sterilization effect can be obtained by adding a high oxygen concentration gas to the rinsing process, but the same effect can be obtained particularly when a sterilization course is provided. It is done. For example, if you want to sterilize a chopping board or kitchen knife that is not dirty, after pre-washing for a few minutes, replace the wash water and rinse again with wash water to which a high oxygen concentration gas has been added. Obtainable. Since the conventional sterilization course uses the oxidizing power of hypochlorous acid or chlorine, a rinsing process of hypochlorous acid is necessary, and there is a problem that the amount of water used increases. Moreover, there has been a problem of corrosion and odor with respect to components of the dishwasher such as metals and rubbers by chlorine.
[0030]
However, since the structure of the present invention utilizes the oxidizing power of active oxygen, it is a safe sterilization method that does not cause the above problems.
[0031]
In the dishwasher according to the present invention, the water level detection device 36 and the oxygen-enriched gas adding means 38 are communicated with each other through the water level detection side path 44, and the spout 39 is communicated with the water level detection device 36 or the water level detection device 36. It has the structure provided in the path | route which carries out. The water level detection device 36 is a float type, and dirt accumulates between the float 47 and the inner wall of the water level detection device 36, so that there is a problem that the float 47 is fixed and malfunctions. This is because, unlike the inside of the cleaning pump, the flow of the cleaning water is gentle in the water level detection device 36, and it is easy to accumulate dirt.
[0032]
However, according to the configuration of the present invention, it is possible to maintain the cleaning water in the water level detection device in a state having a high oxidizing power. Therefore, the inside of the water level detection device can always be kept clean, so that the float can be stably operated. In addition, during the operation, most of the active oxygen generated can be used to remove dirt in the water level detection device by performing the final rinsing process with the least amount of dirt components in the washing water, enabling more effective washing. It becomes.
[0033]
In addition, regarding the high oxygen concentration gas of the present invention, the oxygen concentration in the air is usually about 21%, and a gas having a higher oxygen concentration (for example, the oxygen concentration is about 30% and the rest is nitrogen or carbon dioxide, Alternatively, a cleaning water having an increased oxidizing power is obtained by using a gas of 100% oxygen, and the cleaning performance depends on the oxygen concentration. In addition, there is no necessity to carry out integrally with respect to the use in the cleaning path of the dissolved portion described in the present embodiment, the use in the water level detection means and the use in the final rinsing process, the main washing process, and the rinsing process. Each can be implemented independently. Moreover, in Example 1, although the example of the dishwasher which has a drying function was shown, the same effect is acquired also in the dishwasher which does not accompany a drying function.
[0034]
(Example 2)
In FIG. 4, 50 is oxygen generating means for generating oxygen by electrolysis of tap water as oxygen generating means (hereinafter referred to as “oxygen generating apparatus”), and 51 is a pressurizing means (hereinafter referred to as “oxygen generating apparatus”) provided in the pump side passage 40. (Referred to as “volumetric pressure pump”), the oxygen generated in the oxygen generator 50 is pressurized and ejected from the ejection port 39 to the discharge path 37. In addition, the nozzle 39 is provided with a bubble refining member 52 made of a porous material. By passing a high oxygen concentration gas pressurized by a positive displacement pressure pump 51 through the bubble refining member 52, bubbles are formed. The diameter is reduced to about several tens of microns.
[0035]
The pressure generated by the cleaning pump 26 is usually about 0.4 kgf / cm ² , and a positive pressure pump having a pressure of about 1.2 kgf / cm ² is used. With such a pressure, bubbles can be sufficiently miniaturized even if a porous material having a high pressure loss is used. The oxygen generating means 50 generates oxygen from the anode by partitioning a pair of electrodes 53 with a diaphragm 54 inside the electrolytic cell 70 and causing a direct current to flow through the electrodes 53. The oxygen generating means 50 includes an electrolytic cell 70, a pair of electrodes 53, and a diaphragm 54. In order to replenish the cleaning water from the water supply valve 25, the oxygen generator 50 is described in the present embodiment by a method of generating oxygen by means of electrolysis with a pair of electrodes partitioned by a diaphragm. The method of doing is also considered. Other basic configurations and operations are the same as those in the first embodiment, and are omitted.
[0036]
Although a large amount of high oxygen concentration gas is necessary to exert cleaning performance, the high oxygen concentration gas is periodically replenished from outside by incorporating the oxygen generator 50 in the main body 20 of the dishwasher. In addition, the predetermined cleaning performance can be maintained. In particular, in the case of electrolysis, only tap water is supplied, and the user can use the dishwasher without maintenance.
[0037]
In addition, by providing a bubble refining member made of a porous material at the spout, fine oxygen-enriched gas bubbles ejected during cleaning can be supplied to the cleaning water by increasing the surface area of the bubbles in contact with the cleaning water. By increasing the dissolution rate and increasing the amount of active oxygen generated per unit time, the oxidizing power of the cleaning water increases, and the cleaning performance can be improved.
[0038]
Further, by providing a pressurizing means for pressurizing the generated oxygen-enriched gas to a pressure higher than the pressurizing force by the cleaning pump, the passage pressure loss becomes large for the bubble refining member composed of the porous material provided at the ejection port. However, since it is possible to use a pore having a smaller gap, the generated bubbles can be generated with a smaller bubble diameter and in a large amount.
[0039]
Therefore, it is possible to enhance the cleaning power by dramatically improving the dissolution rate of the oxygen-enriched gas. Moreover, the effect which removes dirt can be heightened by the shock wave which generate | occur | produces from the oxygen-enriched gas which bursts in the dirt vicinity adhering to the tableware surface by mixing an excessive bubble.
[0040]
In addition, when an alkaline detergent is added in the main washing step, the activity of active oxygen in the wash water is increased by making the pH of the wash water alkaline, so that the oxidizing power can be further improved. Therefore, it is possible to improve the cleaning performance more than simply adding a detergent.
[0041]
It should be noted that the installation of the oxygen generator, the addition of the gas refining member, the installation of the pressurizing means, and the use of the alkaline detergent described in the present embodiment are not necessarily carried out as a single unit, but can be carried out independently. Is possible.
[0042]
(Example 3)
In FIG. 5, oxygen enrichment means 60 (hereinafter referred to as “oxygen enriched membrane device”) has an increased oxygen concentration and generates so-called oxygen enriched air, such as an oxygen enriched membrane unit. 61 is provided. The oxygen-enriched membrane unit 61 is composed of a flat membrane of an organic polymer and utilizes the difference in the speed of molecules passing through the membrane. It passes oxygen better than nitrogen in the air, so it has a relatively high oxygen concentration. So-called oxygen-enriched air is obtained. The proportion of oxygen in normal air is about 21% (nitrogen is about 79%), but in the oxygen-enriched air after passing through the oxygen-enriched membrane unit 61 of this embodiment, the proportion of oxygen is about 30. % (Nitrogen 70%).
[0043]
In addition, as shown in FIGS. 7 and 8, the oxygen-enriched membrane unit 61 is formed by laminating a plurality of modules 64 each having a substantially rectangular oxygen-enriched membrane 63 pasted on both sides of a mesh structure frame 62 and having a passage between both membranes. It has a substantially rectangular parallelepiped unit structure, and by sucking the inside of the passage of the frame 62, a part of the air flowing around the oxygen-enriched film 63 passes through the oxygen-enriched film 63 into the passage of the frame 62. The oxygen-enriched air enters, and the obtained oxygen-enriched air is concentrated and exhausted from the unit outlet 67 which is the only outlet of the oxygen-enriched membrane unit 61.
[0044]
In addition, the substantially rectangular oxygen-enriched film 63 has a short side substantially parallel to the air traveling direction (in the present invention, the front-rear direction of the oxygen-enriched film device 60) and a long side substantially perpendicular to the air traveling direction. Thus, the oxygen enriched film device 60 is provided.
[0045]
In addition, outside air is sucked into the oxygen-enriched membrane device 60 from an air inlet (not shown) provided in the main body 20 of the dishwasher inside the oxygen-enriched membrane device 60 and sent to the oxygen-enriched membrane unit 61. Then, the motor passes through the oxygen-enriched film 63 and is sucked into the passage of the frame 62 to remove the outside air from the exhaust port (not shown) provided in the main body 20 of the dishwasher. It has a blower section (hereinafter referred to as “fan”) 65 such as a fan.
[0046]
The fan 65 is provided in the vicinity of the exhaust port on the downstream side of the oxygen-enriched membrane unit 61. Reference numeral 66 denotes suction means such as a pump (hereinafter referred to as “pump”), which is provided above the oxygen-enriched membrane unit 61 in the oxygen-enriched membrane device 60 and sucks it into the oxygen passage and sends it upstream. Further, the pump 66 sends the oxygen-enriched air after passing through the oxygen-enriched film 63 to the upstream outlet 39 and is discharged into the wash water.
[0047]
The pump 66 is a bellows pump having a high operating pressure in order to increase the flow rate of oxygen-enriched air against the passage pressure loss of the oxygen-enriched membrane 63. The oxygen enrichment means 60 includes an oxygen enrichment membrane unit 61, a unit discharge port 67, a fan 65 and a pump 66.
[0048]
Moreover, regarding the ultimate temperature of the wash water in the main washing step, the ultimate temperature when using high-concentration additional air is set lower than the ultimate temperature of the standard operation course in which the main washing step is performed using a detergent. For example, as shown in FIG. 6, in the standard operation course using a detergent, the temperature reached in the main washing process is about 55 ° C. On the other hand, the ultimate temperature when using high-concentration additional air is set to about 45 ° C. This is because the amount of oxygen that can be dissolved increases as the washing water temperature decreases. Therefore, by dissolving more active hydrogen in the cleaning water, the oxidizing power of the cleaning water can be improved and the cleaning performance can be enhanced.
[0049]
Other basic configurations and operations are the same as those in the first embodiment, and are omitted.
[0050]
As described above, according to the present invention, by installing the oxygen-enriched membrane device in the dishwasher main body, it is possible to produce oxygen-enriched gas without requiring any additional consumption material. And the dishwasher which implement | achieves high washing | cleaning performance can be implement | achieved even if it does not use a detergent by making oxygen in air high concentration and raising the oxidizing power of washing water.
[0051]
In addition, by setting the temperature at which the cleaning water reaches during the main washing process to be lower than the standard operation course when the detergent is added, the amount of dissolved oxygen in the cleaning water also increases, so the amount of active oxygen in the cleaning water also increases. , Oxidation power is also improved. Therefore, the cleaning performance can be improved by increasing the oxidative decomposition power against dirt. In addition, by washing at a lower temperature, it is possible to reduce the amount of power consumption required for warming the washing water, so that more energy-saving operation can be realized.
[0052]
It should be noted that the installation of the oxygen-enriched membrane device described in the present embodiment and the lowering of the main washing temperature are not necessarily carried out integrally and can be carried out independently.
[0053]
【The invention's effect】
According to the present invention as described above, it is possible to improve the detergency of the washing water by increasing the amount of active oxygen in the wash water, without the use of detergents dirt in dirt and water level detecting means tableware A dishwasher that can be sufficiently washed can be provided.
[Brief description of the drawings]
1 is a cross-sectional view of a dishwasher according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part of the dishwasher. FIG. 3 is a diagram showing a washing process and a washing temperature of the dishwasher. 4] Cross-sectional view of the main part of the dishwasher according to the second embodiment of the present invention. [FIG. 5] Cross-sectional view of the main part of the dishwasher according to the third embodiment of the present invention. Figure showing temperature [Fig. 7] Perspective view of the oxygen enrichment unit of the dishwasher [Fig. 8] (a) Detailed view of the oxygen enrichment unit (before assembly)
(B) Detailed view of the oxygen enrichment unit (after assembly)
[Figure 9] Diagram showing the operation course of a conventional dishwasher [Explanation of symbols]
22 Cleaning tank 26 Cleaning pump 27 Cleaning nozzle (cleaning means)
36 Water level detection device (water level detection means)
37 Discharge path 38 Oxygen-enriched gas addition means 39 Ejection part (dissolved part)
40 Pump side route (first route)
41 Oxygen storage tank ( oxygen-enriched gas addition means )
42 1st electromagnetic on-off valve ( oxygen-enriched gas addition means )
43 Check valve ( oxygen-enriched gas addition means )
50 Oxygen generator (oxygen generator)
51 Pressurizing pump (pressurizing means)
52 Bubble miniaturization member 53 Electrode (oxygen generating means)
54 Diaphragm (oxygen generating means)
60 Oxygen-enriched membrane device (oxygen-enriching means)
61 Oxygen-enriched membrane unit (oxygen-enriching means)
65 fans (oxygen enrichment means)
66 Pump (oxygen enrichment means)
67 Unit outlet (oxygen enrichment means)
70 Electrolysis tank (oxygen generating means)

Claims (1)

A cleaning tank for storing cleaning water, a cleaning pump for pressurizing the cleaning water, an oxygen-enriched gas addition means for dissolving an oxygen-enriched gas having an oxygen concentration higher than air in the cleaning water, and a cleaning water level stored in the cleaning tank A water level detection means for detecting a water level, a water level detection side path communicating the oxygen enriched gas addition means and the water level detection means, and a second electromagnetic on-off valve in the middle of the water level detection side path, In the final rinsing step, the second electromagnetic on-off valve is opened and the oxygen-enriched gas is dissolved by the oxygen-enriched gas adding means in the wash water in the water level detecting means.

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