JP2009106487A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dishwasher capable of promptly generating a required amount of steam while preventing the overheat of a steam generator. <P>SOLUTION: The dishwasher includes the steam generator for supplying the steam to a washing tub housing dishes. In the dishwasher, the steam generator includes a main body part for storing water inside, a heater for heating the water stored inside the main body part, and a thermistor disposed at the bottom part of the main body part. In the dishwasher, the steam generator evaporates the water stored inside the main body part by the heating of the heater and generates the steam. In the dishwasher, the temperature detection part of the thermistor of the steam generator is disposed at a position higher than the inner side bottom surface of the main body part. In the dishwasher, the steam generator stops the heating of the heater when the detected temperature of the thermistor drops while heating is performed by the heater. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a dishwasher. In particular, it relates to a dishwasher equipped with a steam generator.

  Among dishwashers, those equipped with a steam generator are widespread. In this type of dishwasher, before washing of the dishes is started, the inside of the washing tank is filled with water vapor so that the dirt stuck to the dishes rises. By performing the subsequent cleaning, it is possible to remove dirt firmly adhered to the tableware.

  A steam generator used in a dishwasher is required to quickly generate a necessary amount of water vapor. Patent Document 1 discloses a technique for supplying water every time the water in the steam generator evaporates while energizing the heater of the steam generator to quickly generate a necessary amount of water vapor. In this technique, when the temperature detected by the thermistor provided at the bottom of the steam generator reaches a predetermined threshold value, it is determined that all the water in the steam generator has evaporated, and a predetermined amount of water is supplied. . The threshold value is not detected while the water in the steam generator is boiling, but is detected when all the water in the steam generator evaporates into a so-called empty state ( 110 ° C.).

JP 2007-130143 A

  In the technique of Patent Literature 1, when the temperature detected by the thermistor reaches a threshold value, it is determined that all the water in the steam generator has evaporated, and water is supplied to the steam generator. When such control is performed, the steam generator may be overheated due to overshoot due to control delay. That is, after all the water in the steam generator has evaporated, the controller detects the temperature of the thermistor, it is found that the detected temperature has reached the threshold value, and the controller outputs an instruction to open the water supply valve. Until the water supply valve is opened and water flows into the steam generator, the steam generator continues to be heated in an empty state. When a delay occurs in this series of operations due to a delay in control, even when the above threshold value is set to 110 ° C., the steam generator is 150 by the time water is actually supplied to the steam generator. There is a risk of overheating to about 200 ° C to 200 ° C. If the steam generator becomes so hot, it will damage the corrosion-resistant coating applied to the inside of the steam generator and the resin parts around the steam generator.

  In order to avoid overheating of the steam generator, if the above threshold value is set to a lower value (for example, 105 ° C.), the temperature detected by the thermistor becomes close to the threshold value while water is boiling. Therefore, false detection is likely to occur. In the worst case, when water starts to boil, there is a possibility that it is erroneously detected that all the water has evaporated. When such erroneous detection occurs, unnecessary water supply to the steam generator is performed, or energization to the heater is stopped, thereby delaying the generation of water vapor. The time required to generate the required amount of water vapor is prolonged.

  As described above, in a dishwasher equipped with a steam generator, it is difficult to quickly generate a necessary amount of water vapor and prevent overheating of the steam generator. There is a need for a technique that can quickly generate a necessary amount of water vapor while preventing the steam generator from overheating.

  The present invention was created to solve the above problems, and provides a dishwasher capable of quickly generating a necessary amount of water vapor while preventing overheating of a steam generator. With the goal.

  The present invention is embodied as a dishwasher equipped with a steam generator for supplying water vapor to a washing tank for storing tableware. In the dishwasher, the steam generator includes a main body that stores water therein, a heater that heats the water stored in the main body, and a thermistor disposed at the bottom of the main body. In the dishwasher, the steam generator generates water vapor by evaporating water stored in the main body by heating the heater. In the dishwasher, the temperature detection part of the thermistor of the steam generator is located higher than the inner bottom surface of the main body part. In the dishwasher, when the temperature detected by the thermistor decreases while the steam generator is heating with the heater, heating of the heater is stopped.

  In the dishwasher described above, water stored in the main body of the steam generator is evaporated by heating the heater to generate water vapor. And when the temperature detected by the thermistor decreases, heating by the heater is stopped.

  FIG. 5 shows an example of the thermistor detection temperature history when the water stored in the main body of the steam generator is heated by the heater in the dishwasher. When heating with the heater is started, the water stored in the main body is heated and the temperature detected by the thermistor rises. Thereafter, as shown by W1 in FIG. 5, when the water stored in the main body starts to boil, the detected temperature of the thermistor is stabilized and a constant temperature is detected. However, as indicated by W2 in FIG. 5, there is a period in which the temperature detected by the thermistor slightly decreases immediately before all the water in the main body has evaporated. This decrease in detection temperature is due to the fact that the temperature detection part of the thermistor is located higher than the inner bottom surface of the main body part, so that the water level in the main body part becomes lower than the temperature detection part and the heat of vaporization when water in the main body part evaporates This is thought to be due to a change in the heat balance in the vicinity of the temperature detection section including the above. Note that W3 in FIG. 5 indicates the detected temperature of the thermistor when the heater is continuously heated even after all the water in the main body has evaporated, and if it is not empty, W3 is indicated. The detected temperature history as shown is not shown.

  In the above-described dishwasher, when the temperature detected by the thermistor decreases while the steam generator is heating with the heater, heating of the heater is stopped. Such a decrease in the detected temperature is seen immediately before all the water in the main body of the steam generator has evaporated, and does not occur after all the water in the main body has evaporated. Therefore, even when the control is delayed, the heating of the heater can be stopped at an early stage, and the steam generator is not left empty for a long period of time. It is possible to prevent damage to the internal coating due to overheating of the steam generator. Further, it is possible to prevent the steam generator from being overheated and damaging the surrounding resin parts.

  Moreover, in said dishwasher, the heating by a heater is continued until just before all the water in the main-body part of a steam generator has evaporated. Therefore, a necessary amount of water vapor can be generated quickly.

  In the dishwasher described above, the temperature detected by the thermistor when heated by the heater is set as the reference temperature, and when the steam generator is heated by the heater, When the detected temperature falls below the reference temperature, it is preferable to stop the heating of the heater.

  In the steam generator, when the water stored in the main body begins to boil due to heating by the heater, the temperature detected by the thermistor is stabilized and a constant temperature is detected. The detected temperature of the thermistor when it is stable in this way may be stabilized at different temperatures depending on various factors such as the clogging state of the nozzle that feeds water vapor from the steam generator to the cleaning tank. According to the dishwasher described above, even when the temperature detected by the thermistor is stabilized at any temperature during heating by the heater, the decrease in the temperature detected by the thermistor is reliably detected, and the steam generating device is empty. Baking can be prevented.

  According to the dishwasher of the present invention, it is possible to quickly generate a necessary amount of water vapor while preventing overheating of the steam generator.

Hereinafter, preferred embodiments of the present invention will be described.
(Embodiment 1) The steam generator stops heating the heater when the temperature detected by the thermistor is lower than the reference temperature for a predetermined time during heating with the heater.

A dishwasher according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of the dishwasher 10. The dishwasher 10 is a drawer-type dishwasher. The dishwasher 10 includes a main body 12, a cleaning tank 14, and a door 15.
The cleaning tank 14 is accommodated in a space formed by the main body 12 and the door 15. The cleaning tank 14 is slidably supported by the main body 12. The cleaning tank 14 is slidable with respect to the main body 12 in the front-rear direction (left-right direction in FIG. 1). The cleaning tank 14 is connected to the door 15. When the door 15 is pulled forward (leftward in FIG. 1), the cleaning tank 14 is pulled out together with the door 15. The cleaning tank 14 is formed in a box shape with an open top. In the cleaning tank 14, a cleaning nozzle 21, a tableware basket 61, and the like are accommodated. The cleaning nozzle 21 has a plurality of injection ports 21a. The tableware basket 61 is formed in a shape corresponding to the tableware 19 in order to hold various tableware 19.

  A seal lid 56 is disposed above the cleaning tank 14. The seal lid 56 is connected to the main body 12 by a lifting mechanism (not shown). In a state in which the door 15 is closed (a state in which the cleaning tank 14 is accommodated in the main body 12), the seal lid 56 is lowered to cover the upper opening of the cleaning tank 14. When the cleaning tank 14 is pulled out from the main body 12, the seal lid 56 rises to open the upper opening of the cleaning tank 14.

  A suction recess 31 is formed on the bottom surface 39 of the cleaning tank 14. The upper opening of the suction recess 31 is covered with the leftover filter 17. The leftover filter 17 is formed in a mesh shape. The leftover filter 17 can be removed from the cleaning tank 14. A pump 27 is provided below the bottom surface 39. The pump 27 rotates the impeller 28 by a built-in electric motor. The pump 27 can rotate the impeller 28 in one direction (forward direction) or in the opposite direction (reverse direction). The space in which the impeller 28 is disposed and the suction recess 31 are communicated with each other by a suction flow path 32. An electric heater 30 is mounted above the bottom surface 39 where the pump 27 is disposed. A thermistor 55 is disposed below the heater 30. The thermistor 55 detects the temperature of the water when the cleaning water or the rinsing water is put in the cleaning tank 14, and detects the temperature of the air in the cleaning tank 14 when the cleaning water or the rinsing water is not put.

  The cleaning nozzle 21 is rotatably attached to the bottom surface 39 of the cleaning tank 14. The cleaning nozzle 21 communicates with the first discharge port 11 of the pump 27. When the pump 27 is driven and the impeller 28 rotates in the forward direction, the cleaning water in the cleaning tank 14 is sent to the cleaning nozzle 21. The cleaning water sent to the cleaning nozzle 21 is sprayed into the cleaning tank 14 from the plurality of spray ports 21a. Some of the plurality of injection ports 21a generate a rotational moment in the cleaning nozzle 21 when water is injected.

  An operation panel 16 and an exhaust path 18 are disposed on the door 15. The operation panel 16 is provided with various buttons and lamps. The exhaust path 18 communicates the inside and the outside of the cleaning tank 14.

  A drain hose 34 is connected to the rear wall 33 (the right wall in FIG. 1) of the main body 12. The drain hose 34 and the second discharge port 35 of the pump 27 are communicated with each other by a drain channel 36. A drain check valve 38 is attached to the end of the drain channel 36 on the side connected to the drain hose 34. The drainage check valve 38 prevents drainage from flowing backward from the drainage hose 34 to the drainage flow path 36. When the pump 27 is driven and the impeller 28 rotates in the reverse direction, the cleaning in the cleaning tank 14 is drained from the cleaning tank 14 via the drain channel 36.

  One end of a water supply hose 40 is connected to the rear wall 33 of the main body 12. The other end of the water supply hose 40 is connected to a water supply source (not shown). The water supply hose 40 may be directly supplied with tap water (cold water) or may be supplied with hot water heated by a water heater. One end of the water supply hose 40 is connected to the water supply valve 41 inside the main body 12 via the first water supply flow path 42. The water supply valve 41 is driven by a built-in solenoid to open and close. The water supply valve 41 communicates with the steam generator 65 via the second water supply channel 43.

  The steam generator 65 heats and evaporates the supplied water as necessary. The water supplied to the steam generator 65 may be evaporated and sent out as water vapor, or may simply pass through the steam generator 65 without being heated. The steam generator 65 communicates with a nozzle 67 provided in the cleaning tank 14 via the third water supply channel 66. The water vapor generated by the steam generator 65 is sprayed from the nozzle 67 into the cleaning tank 14 via the third water supply channel 66. Further, the water that simply passes through the steam generator 65 also flows into the cleaning tank 14 from the nozzle 67 via the third water supply channel 66.

A drying fan 52 is disposed between the rear wall 33 of the main body 12 and the rear wall 51 of the cleaning tank 14. The drying fan 52 rotates the fan 53 with a built-in motor. The cleaning tank 14 is connected to the drying fan 52 via the intake path 63.
A recess 58 is formed in the bottom surface 57 of the main body 12. Two electrodes of the water leak detection sensor 59 are inserted into the recess 58. When water leaks from the cleaning tank 14 to the outside and the leaked water flows into the recess 58, the electrodes are connected and the water leak detection sensor 59 is turned on.

  A water level detector 45 is disposed in front of the cleaning tank 14. The water level detector 45 includes a water level chamber 46, a float 47, a bar 48, and a water level switch 49. The water level chamber 46 communicates with the suction recess 31 by a water level path 50. The float 47 is disposed in the water level chamber 46. The bar 48 is fixed to the upper part of the float 47 and protrudes upward from the water level chamber 46. The water level switch 49 is disposed above the bar 48. When water is supplied into the cleaning tank 14, the water is also introduced into the water level chamber 46 via the water level path 50. The water level in the water level chamber 46 is the same as the water level in the cleaning tank 14. That is, when water is supplied into the cleaning tank 14 and the water level in the cleaning tank 14 rises, the water level in the water level chamber 46 also rises. The float 47 floats by the water introduced into the water level chamber 46. When the float 47 rises as the water level in the water level chamber 46 rises, the upper end of the bar 48 contacts the water level switch 49. As a result, the water level switch 49 is turned on.

  FIG. 2 schematically shows the configuration of the steam generator 65. The steam generator 65 includes a box-shaped container-like main body 70 that can store water therein, and a lid 72 that closes the upper opening of the main body 70. The main body portion 70 and the lid portion 72 are made of an aluminum alloy, and a fluorine coating for ensuring corrosion resistance is applied to each inner surface. The lid part 72 is detachably attached to the main body part 70. A seal packing 74 is attached to a portion of the main body portion 70 that contacts the lid portion 72, and the contact portion of the lid portion 72 and the main body portion 70 is hermetically sealed.

  A water supply port 76 communicating with the second water supply channel 43 of FIG. 1 is provided at the bottom of the main body 70. The water supply port 76 opens at the inner bottom surface of the main body 70, and the water supplied from the second water supply flow path 43 is stored in the main body 70.

  Inside the main body 70, a water discharge pipe 77 that extends upward from the inner bottom surface of the main body 70 and opens upward is provided. The opening 79 at the upper end of the water discharge pipe 77 is aligned with the same height as the specified water level inside the main body 70. This specified water level is set to a water level that can generate the amount of water vapor required in the steam process described later when all the water in the main body 70 is evaporated. The opening 79 communicates with the third water supply channel 66 of FIG. 1 through a water outlet 78 at the lower end of the water outlet 77. When water is supplied from the second water supply channel 43 to the steam generator 65, the water level inside the main body 70 rises. When the water level exceeds the specified water level, the water inside the main body 70 opens. It overflows from 79 to the water outlet 78. The water overflowing from the water outlet 78 flows into the third water supply channel 66 and is supplied to the cleaning tank 14 via the nozzle 67.

  A steam heater 80 is provided at the bottom of the main body 70. The steam heater 80 has a substantially U shape and heats the bottom of the main body 70. When the steam heater 80 is energized, the main body 70 is heated to a high temperature, and water inside the main body 70 is heated. By heating, the water in the main body 70 evaporates to become steam, and flows into the third water supply channel 66 from the opening 79 through the water outlet 78. The water vapor flowing into the third water supply channel 66 is sprayed into the cleaning tank 14 through the nozzle 67.

  A steam thermistor 82 is provided at the bottom of the main body 70. The steam thermistor 82 is disposed such that the temperature detection portion 83 is positioned higher than the inner bottom surface of the main body portion 70. The steam thermistor 82 detects the temperature in the temperature detector 83.

  A bimetal switch 84 is built in the bottom of the main body 70. The bimetal switch 84 is normally on, but is switched off when the bottom of the main body 70 becomes an abnormally high temperature.

  A controller 60 is mounted above the water level detector 45 in FIG. The controller 60 is connected to the operation panel 16, pump 27, heater 30, water supply valve 41, water level switch 49, drying fan 52, thermistor 55, water leak detection sensor 59, steam heater 80, steam thermistor 82, and bimetal switch 84. ing. The controller 60 controls the operation of each connected device by the built-in CPU 60a, memory 60b, and the like. The memory 60b stores information for controlling each device.

  FIG. 3 is a flowchart showing a processing procedure performed by the controller 60. As shown in FIG. 3, the dishwasher 10 of the present embodiment performs the steam process S2, the cleaning process S4, the rinsing process S6, and the drying process S8 in order after the tableware 19 is stored in the cleaning tank 14, The tableware 19 in the washing tank 14 is washed. The steam process S2 will be described in detail later. In the washing step S4, the washing water in the washing tank 14 is sucked by the pump 27, and the sucked washing water is sprayed from the washing nozzle 21 to the tableware 19 to wash the tableware 19. In the rinsing step S6, the water in the cleaning tank 14 is sucked by the pump 27 while repeating the drainage and water supply of the cleaning tank 14, and the sucked water is sprayed from the cleaning nozzle 21 to the tableware 19 to rinse the tableware 19. In the drying step S <b> 8, the heater 30 is heated while driving the drying fan 52, and warm air is sent into the cleaning tank 14 to dry the tableware 19.

  FIG. 4 is a flowchart showing details of the process of the controller 60 in the steam process S2.

  In step S12, the water supply valve 41 is opened and water supply from the water supply source is started. Water flows into the main body 70 of the steam generator 65 and the water level in the main body 70 rises. When the water level in the main body 70 exceeds the specified water level, the water overflows into the third water supply channel 66 and the water is also supplied to the cleaning tank 14. The water supplied to the cleaning tank 14 also flows into the water level chamber 46 of the water level detector 45.

  In step S14, the process waits until the water level switch 49 is turned on. When the water level rises together with the water level in the washing tank 14 due to the water supply and the water level switch 49 is turned on, the water supply valve 41 is closed in step S16. At the time when the water level switch 49 is switched on, the water level in the cleaning tank 14 has reached the water level corresponding to the water level switch 49, and the water level in the main body 70 of the steam generator 65 has reached the specified water level. Yes.

  In step S18, energization of the steam heater 80 is started. As a result, the water inside the main body 70 of the steam generator 65 is heated, and the water temperature inside the main body 70 rises.

  In step S20, it is determined whether or not the detected temperature of the steam thermistor 82 has reached 100 ° C. FIG. 5 shows a history of temperature detected by the steam thermistor 82 when the water stored up to the specified water level is heated by the steam heater 80 in the steam generator 65. In the steam generator 65 of the present embodiment, the water vapor generated in the main body 70 is introduced into the cleaning tank 14 through the small-diameter nozzle 67, so that the atmospheric pressure in the main body 70 increases due to the generation of high-temperature water vapor. And the boiling point of the water inside the main-body part 70 becomes higher than 100 degreeC. Therefore, the detected temperature of the steam thermistor 82 exceeds 100 ° C. earlier than the water in the main body 70 boils.

  If the detected temperature of the steam thermistor 82 is less than 100 ° C. in step S20 (NO), the process proceeds to step S22. In step S22, it is determined whether or not the elapsed time from the start of energization of the steam heater 80 has reached 5 minutes.

  If the elapsed time is less than 5 minutes in step S22 (in the case of NO), the process returns to step S20, and the detection temperature of the steam thermistor 82 is determined again.

  If the elapsed time exceeds 5 minutes in step S22 (in the case of YES), the user is informed of the abnormality through the operation panel 16 in step S26, the energization to the steam heater 80 is terminated in step S34, and the steam is The process ends.

  Since the steam generator 65 is designed to evaporate all the water stored up to the specified water level in the main body 70 within 5 minutes, if the steam generator 80 is originally energized, The detected temperature of the steam thermistor 82 does not reach 100 ° C., and 5 minutes does not elapse. However, due to the failure of the steam heater 80, the heating capability may be insufficient, and 5 minutes may elapse while the main body 70 and the water stored therein are not sufficiently heated. Further, although the steam heater 80 operates normally and the main body 70 and the water stored therein are sufficiently heated, the temperature is detected low due to the failure of the steam thermistor 82, and the detected temperature May not reach 100 ° C. In any case, in the dishwasher 10 of this embodiment, when 5 minutes have elapsed from the start of energization of the steam heater 80, the user is informed of the abnormality and forcibly proceeds to the cleaning step S4. To do. Thereafter, the washing step S4, the rinsing step S6, and the drying step S8 are sequentially performed, and the dishwasher 10 finishes the operation.

  If the detected temperature of the steam thermistor 82 exceeds 100 ° C. in step S20 (becomes YES), after waiting for 1 minute in step S24, the process proceeds to step S28. As shown in FIG. 5, when the temperature detected by the steam thermistor 82 reaches 100 ° C., the water inside the main body 70 starts to boil within 1 minute, and the temperature detected by the steam thermistor 82 is stabilized (in the figure). W1). Therefore, by waiting for 1 minute in step S24, the detected temperature of the subsequent steam thermistor 82 is stabilized.

  In step S28, the detected temperature of the steam thermistor 82 is stored in the memory 60b as a reference temperature.

  In step S30, it is determined whether or not the detected temperature of the steam thermistor 82 is lower than the reference temperature for 5 seconds. As indicated by W1 in FIG. 5, a sufficient amount of water still remains in the main body 70, and while the water continues to boil, the temperature detected by the steam thermistor 82 is stable without lowering. In this case, the temperature detected by the steam thermistor 82 does not continue below the reference temperature for 5 seconds. However, as indicated by W2 in FIG. 5, there is a period in which the temperature detected by the thermistor slightly decreases immediately before all the water in the main body 70 has evaporated. This period extends over a length of about 30 seconds, resulting in a decrease in detected temperature of up to about 5 ° C. This decrease in the detected temperature is caused by the fact that the temperature detection unit 83 of the steam thermistor 82 is at a position higher than the inner bottom surface of the main body 70, so that the water level in the main body 70 becomes lower than the temperature detection unit 83. This is probably because the heat balance in the vicinity of the temperature detector 83 including the heat of vaporization when the water of water evaporates changes. In this case, the detected temperature of the steam thermistor 82 continues to be lower than the reference temperature for 5 seconds. 5 indicates the detected temperature of the steam thermistor 82 when energization of the steam heater 80 is continued even after all of the water in the main body 70 has evaporated (so-called emptying). . In the dishwasher 10 of the present embodiment, since the energization to the steam heater 80 is not continued even after all the water in the main body 70 has evaporated, a history of detected temperatures as shown in W3 is actually obtained. There is no indication.

  If the detected temperature of the steam thermistor 82 continues below the reference temperature for 5 seconds in step S30 (in the case of YES), energization of the steam heater 80 is terminated in step S34, and the steam process S2 is terminated. When that is not right (in the case of NO), it progresses to step S32.

  In step S32, it is determined whether or not the elapsed time from the start of energization of the steam heater 80 has reached 5 minutes. If the elapsed time has not reached 5 minutes (in the case of NO), the process returns to step S30, and the detection temperature of the steam thermistor 82 is determined again. When the elapsed time reaches 5 minutes (in the case of YES), the energization to the steam heater 80 is finished in step S34, and the steam process S2 is finished.

  If the bimetal switch 84 of the steam generating device 65 is switched off during the above-described series of processes, the process performed by the controller 60 is forcibly shifted to step S26 by the interrupt process, and the user is transferred to the user in step S26. After the abnormality is notified and the energization to the steam heater 80 is finished in step S34, the steam process S2 is finished.

  When the steam process S <b> 2 is completed, the cleaning tank 14 has already been supplied with water at a water level corresponding to the water level switch 49. In the cleaning step S4 of FIG. 2, the tableware is cleaned using this water.

  In the dishwasher 10 of the present embodiment, the energization of the steam heater 80 is terminated when the detected temperature of the steam thermistor 82 falls below the reference temperature for 5 seconds. Such a decrease in the detected temperature is observed immediately before all of the water in the main body 70 has evaporated, and does not occur after all of the water in the main body 70 has evaporated. Therefore, even when there is a delay in the control by the controller 60, the energization to the steam heater 80 can be terminated at an early stage, and the main body 70 may be heated for a long time in an empty state. Absent. Damage to the fluorine coating due to overheating of the main body 70 and the lid 72 can be prevented. Further, it is possible to prevent damage to surrounding resin parts due to the steam generator 65 being overheated.

  Moreover, in the dishwasher 10 of a present Example, until the water in the main-body part 70 completely evaporates, the heating by the steam heater 80 is continued. Therefore, a necessary amount of water vapor can be generated quickly.

  In the dishwasher 10 of the present embodiment, when the steam heater 80 is energized, the detected temperature when the water in the main body 70 is boiling and the detected temperature of the steam thermistor 82 is stable is used. Is set as the reference temperature. The detection temperature of the steam thermistor 82 when the water in the main body 70 is boiling is stable at different temperatures depending on various factors such as the blocking state of the nozzle 67 that sends water vapor from the steam generator 65 to the cleaning tank 14. There is a case. According to the dishwasher 10 of the present embodiment, when the detected temperature of the steam thermistor 82 is stabilized at any temperature when the steam heater 80 is energized, the detected temperature of the steam thermistor 82 is decreased. Can be reliably detected, and the steam generator 65 can be prevented from emptying.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

The cross-sectional schematic diagram of the dishwasher of an Example. The cross-sectional schematic diagram of the steam generator of an Example. The flowchart which shows all the processes of the dishwasher of an Example. The flowchart which shows the steam process of an Example. The figure which shows the log | history of the detection temperature of the steam thermistor of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tableware washing machine 11 1st discharge port 12 Main body 14 Washing tank 15 Door 16 Operation panel 17 Vegetable filter 18 Exhaust path 19 Tableware 21 Washing nozzle 21a Injection port 27 Pump 28 Impeller 30 Heater 31 Suction recessed part 32 Suction channel 33 Back wall 34 Drain hose 35 Second discharge port 36 Drain flow path 38 Drain check valve 39 Bottom 40 Water supply hose 41 Water supply valve 42 First water supply path 43 Second water supply path 45 Water level detector 46 Water level chamber 47 Float 48 Bar 49 Water level Switch 50 Water level path 51 Rear wall 52 Drying fan 53 Fan 55 Thermistor 56 Seal lid 57 Bottom 58 Recess 59 Water leak detection sensor 60 Controller 60b Memory 61 Tableware basket 63 Intake path 65 Steam generator 66 Third water supply path 67 Nozzle 70 Main body Part 72 lid part 74 seal packing 76 water supply port 77 water discharge Pipe 78 Water outlet 79 Opening 80 Steam heater 82 Steam thermistor 83 Temperature detection part 84 Bimetal switch

Claims (2)

A dishwasher comprising a steam generator for supplying water vapor to a washing tank for storing tableware,
The steam generator
A main body for storing water inside,
A heater for heating the water stored in the main body,
It has a thermistor arranged at the bottom of the main body,
The steam generator generates water vapor by evaporating the water stored in the main body by heating the heater,
The temperature detection part of the thermistor is at a position higher than the inner bottom surface of the body part
A dishwasher that stops the heating of the heater when the temperature detected by the thermistor decreases while the steam generator is heating with the heater. The temperature detected by the thermistor when it is heated with the heater is set as the reference temperature.
The dishwasher of Claim 1 which stops heating of a heater, when the steam generator is heating with a heater and the detected temperature of a thermistor falls below a reference temperature.

Images