JP4688742B2 - Dishwasher - Google Patents

Description

  The present invention relates to a dishwasher that includes a generator that generates positive ions, negative ions, or ozone, and that can be switched in a washing process, a rinsing process, or a drying process.

  FIG. 1 is a side sectional view schematically showing the structure of a conventional dishwasher. As shown in FIG. 1, in a conventional dishwasher / dryer, dishes 7 are accommodated in tableware bowls 5 and 6 in a washing tub 2.

  When cleaning the dishes 7, the detergent is put in, the door is closed, and the user starts the cleaning by pressing the start button. First, a water supply valve (not shown) is opened, tap water is supplied into the cleaning tank 2 and stored up to a water level where the heater 4 is immersed.

  After a water level sensor (not shown) detects a predetermined water level, a series of subsequent operations are automatically performed. When the predetermined water level is reached, water supply is stopped, and at the same time, the motor 15 starts to rotate, and the impeller 14 of the cleaning pump 13 connected to the motor shaft rotates.

  As the impeller 14 of the cleaning pump 13 rotates, the cleaning water stored at the bottom of the cleaning tank 2 is sucked into the cleaning pump 13 from the cleaning pump water supply port 12. And it is supplied to the rotary nozzle 17 from the discharge hose 16, is sprayed to the tableware 7 installed in the upper part from the nozzle opening part, and circulates. The heater 8 is energized as necessary, and the feed water is heated. In this way, due to the mechanical force of the washing water sprayed from the rotary nozzle 11, heat, and the action of the detergent, the dirt is separated from the tableware, dissolved and decomposed, and the tableware is washed.

  Thereafter, in the same manner, the rinsing process is repeated by repeating the injection and circulation of cleaning water from the water supply / drainage and the rotary nozzle 17, and the blower fan motor 21 is started with the final rinse process using hot water being completed. Start the drying process used. By the blower fan 20, the drying air is sucked from the bottom plate inlet 18, and is sent from the blower duct inlet 19 through the blower duct 22 into the cleaning tank 2 from the blower duct outlet 23. If necessary, it is heated by the heater 8 to be warm air. Air containing moisture by drying the interior of the tableware 7 and the washing tub 2 is exhausted from the exhaust port outlet 25 through the passage of the labyrinth structure from the exhaust port inlet 24 opened inside the upper door 4.

  Since it has been difficult for conventional dishwashers to wash, for example, starch stains, protein stains, etc., recently, many dishwashers using the starch decomposition action of ozone have been developed. For example, Patent Document 1 discloses a dishwasher in which ozone is mixed into cleaning water by an ejector for the purpose of sterilization.

  However, simply by mixing ozone into the cleaning water as in Patent Document 1, the cleaning water is not heated, and a cleaning effect on starch stains cannot be obtained. In addition, when detergent is used and the amount of detergent used is less than the specified amount, or when no detergent is used, the odor of the dirt itself spreads in the washing tank and There was a problem of sticking to tableware. Furthermore, even when the bacteria can be sterilized in the washing process or the rinsing process, airborne bacteria, fungi, etc. in the air are taken into the washing tank by taking air into the washing tank from the outside in the drying process. . Therefore, the problem of being unfavorable for hygiene was also left.

Thus, for example, Patent Document 2 discloses a dishwasher that eliminates floating bacteria, fungi, and the like in a washing tank by mixing ozone into the outside air taken in from the outside in the drying process. Patent Document 3 discloses a dishwasher that disinfects airborne bacteria floating in the air by generating positive ions and negative ions in the drying process.
JP-A-2-77223 JP-A-3-289924 JP 2004-351010 A

However, in the conventional dishwasher described above, ozone is mixed into the outside air taken in from the outside in the drying process, but the odor of ozone itself and the safety to the human body become a problem by using gaseous ozone. In addition, when ozone is mixed into the cleaning water, when the cleaning or rinsing is completed, if ozone remains inside the tube or the like that leads from the generator to the mixing point of the cleaning water, Since it may be corroded, it is not preferable.

  Further, Patent Document 2 sterilizes floating bacteria floating in the air by generating positive ions and negative ions in the drying process. However, the odor component cannot be decomposed after washing. There was a problem that bacteria attached to the inner surface of the tank or the dishes in the washing tank could not be sterilized.

This invention is made | formed in view of such a situation, and can prevent the corrosion by ozone, such as a tube which guide | induces ozone from a generator to the mixing location to washing water in a washing | cleaning process or a rinsing process. The object is to provide a dishwasher.

Dishwasher according to the present invention in order to achieve the above object, a cleaning step of cleaning the dishes with washing water supplied into the cleaning tank, a rinsing step rinsing dishes in the washing water, the dishes by hot air A dishwasher having a drying step , wherein a water supply duct for circulating the washing water, a generator for generating ozone in the washing step or the rinsing step , one end of the water supply duct and the other end of the generator A tube that is opened most recently and that guides the air in the vicinity of the generator to the water supply duct, and when the generator generates ozone in the cleaning step or the rinsing step, the cleaning step or the rinsing step Cleaning or rinsing is performed for a predetermined time before the generator is stopped, or the generator is stopped for a predetermined time after the cleaning step or rinsing step is completed. Characterized in that the are to washing or to perform rinsing while.

In the present invention, a generator for generating ozone is provided in a washing process for washing dishes with washing water or a rinsing process for dishes, and one end is opened to a water supply duct that circulates washing water, and the other end is close to the generator. Ozone generated by the opened tube is induced and mixed into the cleaning water. Therefore, in the washing step or the rinsing step, the oxidizing power of ozone can be utilized, and starch stains, protein stains and the like adhering to tableware can be washed.
Further, in the present invention, the cleaning or rinsing is performed for a predetermined time before the cleaning process or the rinsing process is completed, or the predetermined time after the cleaning process or the rinsing process is completed. Perform cleaning or rinsing with the vessel stopped. This stops the generation of ozone while washing or rinsing is performed for a predetermined time, and only air that does not contain ozone is induced in the tube, so that ozone gas can stay in the tube in advance. It is possible to prevent the tube from being corroded by ozone gas.

In the dishwasher according to the present invention, the generator generates positive ions and negative ions in the drying step, and the generator sends air into the washing tank in the drying step. disposed in the inside, from the top rear surface of the cleaning tank, an exhaust duct for exhausting the air in the cleaning tank into the upper surface of the cabinet for accommodating the cleaning tank, the bottom surface of the exhaust duct the exhaust from the exhaust outlet It has a downward slope towards the inlet, characterized by Tei Rukoto comprises a blowing means for pumping to the outside by sucking air in the cleaning tank into the exhaust duct.

In the present invention, the generator that generates positive ions and negative ions in the drying process is disposed inside the air duct that feeds air into the cleaning tank in the drying process , and the cleaning tank is accommodated from the upper rear surface of the cleaning tank. There is provided an air blowing means for sucking the air in the cleaning tank into the exhaust duct for exhausting the air in the cleaning tank to the upper surface of the cabinet to be pumped to the outside . As a result, in the drying process, positive ions and negative ions generated by the generator are sucked from the blow duct by the blowing means in the exhaust duct and supplied into the washing tank, so that the inside of the washing tank becomes negative pressure, and positive ions In addition, the inside of the cleaning tank can be effectively sterilized without negative ions flowing out from the gap.
Furthermore, since the bottom surface of the exhaust duct has a downward slope from the exhaust outlet to the exhaust inlet, even if moisture evaporated in the drying process is condensed, it is dropped downward along the bottom slope. Can be reliably returned to the cleaning tank.

In the dishwasher according to the present invention, the exhaust duct is characterized in that ribs protruding from the upper surface and the lower surface are arranged inside the labyrinth structure .

In the present invention, a rib protruding from the upper surface or the lower surface is provided in the exhaust duct, and the rib is arranged to have a labyrinth structure. Due to the labyrinth structure in the exhaust duct, the outflow of water vapor and heat inside can be suppressed by the draft effect even when the water temperature is relatively high in the cleaning process or the rinsing process, and the power consumption is increased. Can be minimized.

Moreover, the dishwasher according to the present invention comprises door opening detection means for detecting opening of a door for taking in and out of the tableware, and when the generator generates ozone in the washing step or the rinsing step, When the door opening detection means detects the opening of the door, the generator is stopped and the air blowing means is operated for a predetermined time .

In the present invention, it is provided with door opening detection means for detecting opening of a door for taking in and out of tableware, and when the generator generates ozone in the cleaning process or the rinsing process, it is detected that the door is opened. When this occurs, the generation of ozone is stopped and the air is blown for a predetermined time. As a result, when ozone dissolved in water partially evaporates and stays in the washing tank, even when the user opens the door during operation, ozone gas is sucked from the exhaust duct inlet and decomposed by ozone. It can be decomposed with a catalyst, activated carbon or the like. Therefore, the user is not directly exposed to ozone gas and is safe.

In the dishwasher according to the present invention, the generator generates positive ions and negative ions, or ozone by applying an AC voltage to discharge, and generates positive ions and negative ions. Ozone generation when generating positive ions and negative ions by setting the number of discharges per unit time to about the commercial frequency and the number of discharges per unit time when generating ozone to about nine times the commercial frequency The amount is reduced from the amount of ozone generated when ozone is generated .

In the present invention, the generator is a creeping discharge system that generates ozone, positive ions, and negative ions by applying an alternating voltage to discharge, and changes the number of discharges per unit time to generate ozone. Control whether positive ions and negative ions are generated. Thereby, it is possible to switch between generating positive ions and negative ions or generating ozone with one discharge electrode, and an inexpensive and simple structure can be obtained. Moreover, the generation amount of ozone when generating positive ions and negative ions can be reduced as much as possible.

According to the present invention, in the washing step or the rinsing step, the oxidizing power of ozone can be utilized, and starch stains, protein stains and the like adhering to tableware can be washed. In addition, since the generation of ozone is stopped before the cleaning or rinsing is completed, it is possible to prevent the ozone gas from staying in the tube and to prevent the tube from being corroded by the ozone gas. Become.

Further, according to the present invention, in the drying process, floating bacteria, fungi, etc. in the washing tank can be sterilized by the action of positive ions and negative ions, and an odor is generated as in the case of using ozone. It is also safe for the human body. In addition, positive ions and negative ions are sucked from the air duct by the air blowing means and supplied into the cleaning tank, so that the inside of the cleaning tank becomes negative pressure and the positive ions and negative ions do not flow out of the gap. Can be effectively sterilized. Further, even when moisture evaporated in the drying process is condensed, it can be dropped downward along the gradient of the bottom surface of the exhaust duct, and can be reliably returned to the cleaning tank.

Further, according to the present invention, since the inside of the exhaust duct has a labyrinth structure, even if the water temperature is relatively high in the cleaning process or the rinsing process, the outflow of water vapor and heat inside is suppressed by the draft effect. It is possible to minimize the increase in power consumption.

Further, according to the present invention, when ozone dissolved in water partially evaporates and stays in the washing tank, when the user opens the door during operation, the generation of ozone gas is stopped. The ozone gas in the cleaning tank can be sucked and exhausted to the outside. Therefore, the user is not directly exposed to ozone gas and is safe.

Further, according to the present invention, by changing the number of discharges per unit time for one of the discharge electrodes, or generate positive ions and negative ions, or it can be switched to generate ozone, low cost A simple structure can be obtained. In addition, the amount of ozone generated when generating positive ions and negative ions can be minimized.

  Hereinafter, a dishwasher according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 2 is a side sectional view schematically showing the configuration of the dishwasher according to the embodiment of the present invention. As shown in FIG. 2, in a conventional dishwasher, tableware 7 is accommodated in tableware bowls 5 and 6 in the washing tub 2.

  The user closes the door after supplying the detergent, selects, for example, “low temperature course”, and then presses the start button. When it is detected that the start button has been pressed, a water supply valve (not shown) is first opened, and water supply into the cleaning tank 2 is started. When the control device 26 that controls the operation of the dishwasher receives a signal indicating that water has been supplied up to a washable water level from a water level sensor (not shown), it closes the water supply valve and outputs a series of subsequent operation instructions. To do.

  FIG. 3 is a block diagram showing the configuration of the control device 26 of the dishwasher according to the embodiment of the present invention. As shown in FIG. 3, the control device 26 includes a CPU (Central Processing Unit) 261, a ROM 262, a RAM 263, a timer 264 for measuring time, an input / output port 265, and the like, which are connected to each other by an internal bus 266. ing. Connected to the input / output port 265 are a water level sensor, a motor for driving the injection nozzle, a heater for heating the cleaning water, a water supply valve for opening and closing the water supply port, and the like.

  The CPU 261 of the control device 26 uses the RAM 263 as a working area and executes a program stored in the ROM 262 to generate a generator 40 that generates water supply and drainage such as dishwashing, on / off of the heater 8, positive ions, negative ions, or ozone. Controls the level of voltage applied to the.

  In the generator 40 that generates positive ions, negative ions, or ozone, a pair of surface electrodes are formed integrally with a dielectric on both sides of a flat dielectric. A protective layer is formed on the surface of the surface-side electrode, and an electrode contact is formed on the dielectric for each surface electrode. A high-voltage alternating current can be applied to each electrode contact via a lead wire, and a high-voltage alternating current is applied to cause creeping discharge to generate positive ions, negative ions, or ozone.

Moreover, when generating ozone, a high voltage alternating current is applied as it is (for example, the number of discharges is 540 times / s), and when generating positive ions and negative ions, phase control of the high voltage alternating current is performed to reduce the number of discharges. (For example, the number of discharges is 60 times / s). By doing in this way, when generating ozone, the amount of ozone can be generated 10 times or more than when generating positive ions and negative ions. When generating positive ions and negative ions, In each case, 500,000 / cm ³ or more positive ions and negative ions could be generated.

  Hereinafter, the washing process of the dishwasher according to the embodiment of the present invention will be described. FIG. 4 is a flowchart showing a processing procedure in a cleaning process using a detergent of CPU 261 of control device 26 of the dishwasher according to the embodiment of the present invention.

  The CPU 261 of the control device 26 transmits a water supply valve closing signal to the water supply valve (step S401), and stops water supply. The CPU 261 transmits a normal rotation instruction signal to the motor 15 (step S402), and starts to rotate the impeller 14 of the cleaning pump 13 connected to the motor shaft. Thus, the water stored in the bottom of the cleaning tank 2 passes through the residual filter 9 and is connected to the cleaning tank water supply port 10 and the cleaning pump water supply port 12 at the bottom of the cleaning tank 2 to communicate with each other. It passes through the duct 11 and is sucked into the cleaning pump 13 from the cleaning pump water supply port 12. Further, water is supplied from the discharge hose 16 to the rotary nozzle 17 and is jetted and washed from the nozzle opening to the tableware 7 installed on the upper side.

  An intake chamber 44 is formed in the middle of the water supply duct 11, and one end of a tube 43 is connected to the intake chamber 44. The other end of the tube 43 is opened to a generator chamber 41 that is partitioned around the generator 40 disposed in the vicinity of the inlet 19 of the air duct 42. A part of the tube 43 is disposed at a position higher than the maximum water level that can be stored in the cleaning tank 2, so that water in the cleaning tank 2 does not leak from the tube 43 to the outside. In addition, you may arrange | position the generator 40 so that it may become a position higher than the maximum water level which can be stored in the washing tank 2. FIG. Between the intake chamber 44 and the water supply duct 11, bubble refining means 45 made of porous ceramic such as air stone is disposed.

  Due to the operation of the cleaning pump 13, the inside of the water supply duct 11 becomes negative pressure. Therefore, the tube 43 sucks only air from the generator chamber 41. The sucked air passes through the intake chamber 44 and becomes fine bubbles by the bubble refining means 45 and is supplied to the water supply duct 11.

  The fine bubbles are subjected to a large shearing force by the impeller 14 in the cleaning pump 13, and are further miniaturized and injected. Since the bubbles are miniaturized, air is not generated in the cleaning pump 13, and more air can be mixed. Accordingly, the tableware 7 is washed by separating, dissolving, and decomposing the dirt from the tableware by the mechanical force of the washing water sprayed from the rotating nozzle 11, the heating by the heater 8, and the action of the detergent.

  The CPU 261 determines whether or not the cleaning water has reached a set temperature, for example, 50 ° C. (step S403). When the CPU 261 determines that the set temperature has not been reached (step S403: NO), the CPU 261 determines whether the set time has elapsed (step S404). When the CPU 261 determines that the set time has not elapsed (step S404: NO), the CPU 261 returns the process to step S403 and repeats the above-described process.

  When the CPU 261 determines that the set temperature has been reached (step S403: YES) or when the set time has been determined (step S404: YES), the CPU 261 transmits a reverse rotation instruction signal to the motor 15. (Step S405), the cleaning pump 13 connected to the motor shaft is reversely rotated to drain the dirty cleaning water in the cleaning tank 2 from the drain port to the outside of the cleaning tank 2.

  The CPU 261 determines whether or not a predetermined time has elapsed since the motor 15 started reverse rotation (step S406). If the CPU 261 determines that the predetermined time has elapsed (step S406: YES), the CPU 261 A rotation stop instruction signal is transmitted to 15 (step S407), the cleaning pump 13 connected to the motor shaft is stopped, and the cleaning process is completed.

  Next, the CPU 121 executes a first rinsing process. FIG. 5 is a flowchart showing a processing procedure in the first rinsing step of the CPU 261 of the control device 26 of the dishwasher according to the embodiment of the present invention.

  The CPU 261 of the control device 26 transmits a water supply valve opening signal to the water supply valve (step S501), and starts supplying new tap water. The CPU 261 determines whether or not a signal indicating that the predetermined water level has been reached is received from the water level sensor (step S502), and if the CPU 261 determines that a signal indicating that the predetermined water level has been received is received (step S502). (S502: YES), the CPU 261 transmits a water supply valve closing signal to the water supply valve to stop water supply (step S503), transmits a forward rotation instruction signal to the motor 15 (step S504), and connects to the motor shaft. The rotation of the impeller 14 of the washing pump 13 thus started is started.

  Thus, the water stored in the bottom of the cleaning tank 2 passes through the residual filter 9 and is connected to the cleaning tank water supply port 10 and the cleaning pump water supply port 12 at the bottom of the cleaning tank 2 to communicate with each other. It passes through the duct 11 and is sucked into the cleaning pump 13 from the cleaning pump water supply port 12. Further, water is supplied from the discharge hose 16 to the rotary nozzle 17 and is jetted and washed from the nozzle opening to the tableware 7 installed on the upper side.

  Due to the operation of the cleaning pump 13, the inside of the water supply duct 11 becomes negative pressure. Therefore, the tube 43 sucks only air from the generator chamber 41. The sucked air passes through the intake chamber 44 and becomes fine bubbles by the bubble refining means 45 and is supplied to the water supply duct 11.

  The fine bubbles are subjected to a large shearing force by the impeller 14 in the cleaning pump 13, and are further miniaturized and injected. Since the bubbles are miniaturized, air is not generated in the cleaning pump 13, and more air can be mixed. Thereby, the stain | pollution | contamination isolate | separated from the tableware, melt | dissolved, and decomposed | disassembled and adhered to the surface of the tableware 7 by the mechanical force of the washing water injected from the rotating nozzle 11 and the heating by the heater 8 can be rinsed.

  The CPU 261 determines whether or not the set time has elapsed (step S505), and when the CPU 261 determines that the set time has elapsed (step S505: YES), the CPU 261 outputs a reverse rotation instruction signal to the motor 15. This is transmitted (step S506), and the cleaning pump 13 connected to the motor shaft is reversely rotated to drain the dirty cleaning water in the cleaning tank 2 from the drain port to the outside of the cleaning tank 2.

  The CPU 261 determines whether or not a predetermined time has elapsed since the motor 15 started reverse rotation (step S507). If the CPU 261 determines that the predetermined time has elapsed (step S507: YES), the CPU 261 determines that the motor 261 A rotation stop instruction signal is transmitted to 15 (step S508), the cleaning pump 13 connected to the motor shaft is stopped, and the first rinsing process is completed.

  Next, the CPU 121 executes a second rinsing process. FIG. 6 is a flowchart showing a processing procedure in the second rinsing step of the CPU 261 of the control device 26 of the dishwasher according to the embodiment of the present invention. In the second rinsing step, ozone is generated in the generator 40, the heater 8 is operated, and water is injected from the rotary nozzle 17 at a set temperature of about 50 ° C. for a predetermined time.

  The CPU 261 of the control device 26 transmits a water supply valve opening signal to the water supply valve (step S601), and starts supplying new tap water. The CPU 261 determines whether or not a signal indicating that the predetermined water level has been received from the water level sensor (step S602), and if the CPU 261 determines that a signal indicating that the predetermined water level has been received is received (step S602). (S602: YES), the CPU 261 transmits a water supply valve closing signal to the water supply valve to stop water supply (step S603), transmits a forward rotation instruction signal to the motor 15 (step S604), and is connected to the motor shaft. The rotation of the impeller 14 of the washing pump 13 thus started is started.

  In addition, the CPU 261 transmits an ozone generation instruction signal for generating ozone to the generator 40 (step S605). Specifically, a predetermined number of discharge instruction signals are transmitted so that the number of discharges in the generator chamber 41 increases. The generator 40 discharges a predetermined number of times or more when an alternating high voltage is applied to generate ozone in the generator chamber 41.

  Thus, the water stored in the bottom of the cleaning tank 2 passes through the residual filter 9 and is connected to the cleaning tank water supply port 10 and the cleaning pump water supply port 12 at the bottom of the cleaning tank 2 to communicate with each other. It passes through the duct 11 and is sucked into the cleaning pump 13 from the cleaning pump water supply port 12. Further, water is supplied from the discharge hose 16 to the rotary nozzle 17 and is jetted and washed from the nozzle opening to the tableware 7 installed on the upper side.

  Due to the operation of the cleaning pump 13, the inside of the water supply duct 11 becomes negative pressure. Therefore, the tube 43 sucks air containing ozone from the generator chamber 41. The sucked air containing ozone is supplied to the water supply duct 11 through the intake chamber 44 as fine bubbles by the bubble refining means 45.

  The fine bubbles are subjected to a large shearing force by the impeller 14 in the cleaning pump 13, and are further miniaturized and injected. Since the bubbles are miniaturized, air is not generated in the cleaning pump 13, and more ozone can be mixed. It has been experimentally verified that if the water temperature is a predetermined temperature, for example, 40 ° C. or higher, starch stains can be efficiently decomposed in the presence of ozone.

  Thereby, starch stains and low molecular weight fat stains are decomposed and washed by the mechanical force of the wash water sprayed from the rotary nozzle 11, heating by the heater 8, and the chemical force of ozone, and rinse water and Tableware can be sterilized.

  The CPU 261 determines whether or not the set time has elapsed (step S606), and if the CPU 261 determines that the set time has elapsed (step S606: YES), the CPU 261 generates ozone for the generator 40. An ozone generation stop signal to be stopped is transmitted (step S607). A reverse rotation instruction signal is transmitted to the motor 15 (step S608), and the cleaning pump 13 connected to the motor shaft is reversely rotated, so that the dirty cleaning water in the cleaning tank 2 is discharged from the drain port to the cleaning tank 2 Drain to the outside.

  The CPU 261 determines whether or not a predetermined time has elapsed since the motor 15 started reverse rotation (step S609). When the CPU 261 determines that the predetermined time has elapsed (step S609: YES), the CPU 261 determines that the motor 261 A rotation stop instruction signal is transmitted to 15 (step S610), the cleaning pump 13 connected to the motor shaft is stopped, and the second rinsing process is completed.

  In addition, when the generator 40 is generating ozone, when the CPU 261 receives a signal indicating that the door is opened from a door opening detection unit (not shown), control may be performed so that ozone gas does not leak to the outside. preferable. FIG. 7 is a flowchart showing the processing procedure of the CPU 261 of the control device 26 when the door is opened during ozone generation.

  When the generator 40 is generating ozone, the CPU 261 of the control device 26 determines whether or not to receive a signal indicating that the door is open (step S701). When the CPU 261 determines that a signal indicating the opening of the door has been received (step S701: YES), the CPU 261 transmits a stop signal to the cleaning pump 13, the heater 8, and the generator 40 (step S702), and counts time. Is started (step S703).

  The CPU 261 transmits a rotation signal to the blower fan 30 (step S704), and determines whether or not a set time has elapsed (step S705). By rotating the blower fan 30, ozone gas partially evaporated from the water used for rinsing and staying in the cleaning tank 2 can be sucked from the exhaust inlet 32 and guided to the ozone decomposition honeycomb body 35. The remaining ozone gas is decomposed by the ozone decomposition honeycomb body 35 and discharged from the exhaust outlet 36. Therefore, the user is safe without directly touching the ozone gas.

  When the CPU 261 determines that the set time has elapsed (step S705: YES), the CPU 261 transmits a rotation stop signal to the blower fan 30 (step S706). When the CPU 261 determines that the predetermined time has not elapsed (step S705: NO), the CPU 261 determines whether a signal indicating the closing of the door has been received (step S707). When the CPU 261 determines that the signal indicating the closing of the door has not been received (step S707: NO), the CPU 261 returns the process to step S705 and repeats the above-described process.

  When the CPU 261 determines that a signal indicating the closing of the door has been received (step S707: YES), the CPU 261 transmits a restart signal to the cleaning pump 13, the heater 8, and the generator 40 (step S708), and rinses. To resume.

  In addition, when the generator 40 generates ozone, it is also preferable to prevent the generated ozone from remaining in the tube 43. In order to reliably induce the generated ozone to the water supply duct 11, when the water temperature used for the washing process or the rinsing process, for example, the water temperature used for washing or rinsing reaches a set temperature of 50 ° C. or when the set time has elapsed In this case, a stop signal is transmitted to the generator 40, and in this state, only the cleaning pump 13 continues to rotate for a certain time, for example, 1 minute.

  By doing in this way, after stopping generation of ozone, only air is supplied from the tube 43 to the water supply duct 11 for a certain period of time, so even if the cleaning pump 13 is stopped after a certain period of time, Ozone does not stay in the tube 43, and corrosion of the tube 43 due to ozone can be prevented. Of course, the same effect can be expected even if an ozone generation stop signal is transmitted to the generator 40 a predetermined time before the cleaning process or the rinsing process is stopped.

  The CPU 121 repeats the second rinsing process the number of times corresponding to the cleaning mode selected by the user, and performs the same process as the first rinsing process, that is, the final rinsing without performing ozone generation by the generator 40. After the rinsing process, the process proceeds to the drying process.

  An exhaust inlet 32 is opened at the upper back of the cleaning tank 2, and an exhaust outlet 36 is opened at the upper part of the cabinet 1 that houses the cleaning tank 2. And the exhaust duct 34 which connects the exhaust inlet 32 and the exhaust outlet 36 is provided. The bottom surface 33 of the exhaust duct 34 has a downward gradient from the exhaust outlet 36 of the cabinet 1 toward the exhaust inlet 32 of the cleaning tank 2. Air blowing means 30 is provided for sucking air and pumping the air from the exhaust outlet 36 of the cabinet 1 to the outside.

  At least one or more ribs protruding in the vertical direction are provided in the exhaust duct 34 to form a labyrinth structure. A honeycomb-shaped ozone decomposition catalyst or activated carbon 35 is disposed immediately below the exhaust outlet 36 of the cabinet 1, so that air discharged from the exhaust outlet 36 can be vented substantially vertically. Moreover, it is preferable that the size of a single cell of the honeycomb-shaped ozone decomposition catalyst or activated carbon 35 is not clogged by moisture. This is because water droplets generated by cooling the steam containing moisture are surely dropped on the bottom surface of the exhaust duct 34.

  Hereinafter, the drying process of the dishwasher which concerns on embodiment of this invention is demonstrated. FIG. 8 is a flowchart showing a processing procedure in the drying process of the CPU 261 of the control device 26 of the dishwasher according to the embodiment of the present invention.

  CPU261 transmits a rotation instruction | indication signal with respect to the motor 31 which drives the ventilation fan 30 (step S801). The CPU 261 simultaneously transmits an operation signal to the heater 8 (step S802), and transmits a generation instruction signal of positive ions and negative ions to the generator 40 (step S803). As the blower fan 30 rotates, the drying air is supplied from the bottom plate inlet 18 through the blower duct inlet 19 and positive ions and negative ions generated by the generator 40 in the generator chamber 41. Drying air containing positive ions and negative ions passes through the air duct 42 and is fed into the cleaning tank 2 from the air duct outlet 23. Further, warm air heated by the heater 8 is also sent into the cleaning tank 2.

  At this time, mold bacteria, floating bacteria, and the like contained in the air taken in from the outside are sterilized by the action of positive ions and negative ions and supplied into the cleaning tank 2. Air containing moisture by drying the inside of the tableware and washing tub 2 passes through the honeycomb 35 through the passage of the labyrinth structure from the exhaust inlet 32 and is exhausted from the exhaust outlet 36.

  The CPU 261 determines whether or not a predetermined time has elapsed (step S804). If the CPU 261 determines that the predetermined time has elapsed (step S804: YES), the CPU 261 includes a motor 31 and a heater that drive the blower fan 30. 8 and a stop signal are transmitted to the generator 40 (step S805), and the drying process is terminated.

  In addition, when the user intends to reduce the odor in the tableware 7 and the washing tank 2 during the drying process, for example, by performing a key operation (not shown) before starting the washing process, the generator is generated in the drying process. For example, the generation of positive ions and negative ions and the generation of ozone may be alternately operated. By doing in this way, a trace amount ozone can be included in drying air with a positive ion and a negative ion in a drying process, and it becomes possible to reduce an odor.

  In the embodiment described above, the case where the “low-temperature course” is selected is described. However, for example, when a course that does not use a detergent is selected, ozone is generated in the generator 40 in an arbitrary process. By making the water temperature or the air temperature to 40 ° C. or higher by the heater 8, it becomes possible to reliably decompose the starch stain.

  For example, protein stains may be washed at 40 ° C. or higher by increasing the hardness of the feed water or washing with salt and dissolving ozone in the feed water whose hardness has been lowered in a later step. Moreover, when the low temperature sterilization key is selected in an arbitrary course, the water temperature setting temperature in the final heating rinsing step is set to 60 ° C. or less, and the sterilizing action due to the temperature cannot be obtained in the arbitrary rinsing step 60. You may make the generator 40 produce | generate ozone by the preset temperature of ℃ or less.

  In the above-described embodiment, the case where ozone is generated in the second and subsequent rinsing steps and positive ions and negative ions are generated in the drying step is described. However, the present invention is not particularly limited thereto. If it can be controlled not to generate ozone in the drying process, the same effect can be expected regardless of the process in which positive ions and negative ions are generated.

It is a sectional side view which shows typically the structure of the conventional dishwasher. It is a sectional side view which shows typically the structure of the dishwasher which concerns on embodiment of this invention. It is a block diagram which shows the structure of the control apparatus of the dishwasher which concerns on embodiment of this invention. It is a flowchart which shows the process sequence in the washing | cleaning process using the detergent of CPU of the control apparatus of the dishwasher which concerns on embodiment of this invention. It is a flowchart which shows the process sequence in the 1st rinse process of CPU of the control apparatus of the dishwasher which concerns on embodiment of this invention. It is a flowchart which shows the process sequence in the 2nd rinse process of CPU of the control apparatus of the dishwasher which concerns on embodiment of this invention. It is a flowchart which shows the process sequence of CPU of a control apparatus when a door is open | released at the time of ozone production | generation. It is a flowchart which shows the process sequence in the drying process of CPU of the control apparatus of the dishwasher which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cabinet 2 Cleaning tank 3 Lower door 4 Upper door 8 Heater 11 Water supply duct 13 Cleaning pump 17 Rotating nozzle 20, 30 Blower fan 22 Blower duct 26 Controller 34 Exhaust duct 35 Honeycomb body 40 Generator 41 Generator room 42 Blower duct 43 Tube 44 Air intake chamber 45 Bubble miniaturization means

Claims (5)

A cleaning step of cleaning the dishes with washing water supplied into the cleaning tank, the dishwasher having a rinsing step rinsing dishes in the washing water, and a drying step of drying the dishes by hot air,
A water supply duct that circulates the wash water, a generator that generates ozone in the cleaning or rinsing process , one end open to the water supply duct and the other end close to the generator, and air in the vicinity of the generator A tube for guiding the water to the water supply duct ,
When the generator generates ozone in the cleaning step or the rinsing step, the cleaning or rinsing is performed with the generator stopped for a predetermined time before the cleaning step or the rinsing step ends, or The dishwasher is characterized in that the washing or rinsing is performed with the generator stopped for a predetermined time after the washing step or the rinsing step is completed . The generator generates positive ions and negative ions in the drying step ,
The generator is arranged to air at the drying step in the interior of the air duct for feeding to said cleaning tank,
An exhaust duct for exhausting the air in the cleaning tank from the upper back surface of the cleaning tank to the upper surface of a cabinet containing the cleaning tank;
The bottom surface of the exhaust duct has a downward slope from the exhaust outlet toward the exhaust inlet, and is provided with air blowing means for sucking the air in the cleaning tank into the exhaust duct and feeding it to the outside. The dishwasher according to claim 1. 3. The dishwasher according to claim 2 , wherein the exhaust duct has ribs protruding from an upper surface and a lower surface in the inside so as to have a labyrinth structure . Equipped with door opening detection means for detecting the opening of the door to put in and out tableware,
In the cleaning step or the rinsing step, when the generator generates ozone, when the door opening detection means detects the opening of the door, the generator is stopped and the blowing means is operated for a predetermined time. 4. The dishwasher according to claim 3 , wherein the dishwasher is configured as described above. The generator generates positive ions and negative ions, or ozone by discharging by applying an alternating voltage, and the number of discharges per unit time when generating positive ions and negative ions is about the commercial frequency. By making the number of discharges per unit time when generating ozone about 9 times the commercial frequency, the amount of ozone generated when generating positive ions and negative ions is reduced to the amount of ozone generated when generating ozone. The dishwasher / dryer according to any one of claims 2 to 4, wherein the amount is less than the amount generated.

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