JP4881909B2 - Dishwasher - Google Patents

Description

  The present invention relates to a dishwasher.

  In the cleaning process and the rinsing process, the spraying apparatus sprays cleaning water into the cleaning tank to clean the dishes in the cleaning tank. In the cleaning process and the rinsing process, the opening provided for taking in and out the tableware is closed by a lid. However, the opening of the cleaning tank may not be blocked by the lid. For example, in a so-called drawer type dishwasher in which the washing tub can be pulled out from the main body of the dishwasher, the tableware contained in the washing tub comes into contact with the lid, or a foreign object is placed between the washing tub and the lid. As a result, the opening of the cleaning tank may not be blocked by the lid. If the spray device sprays cleaning water in a state where the opening of the cleaning tank is not closed by the lid, the cleaning water leaks out of the cleaning tank. Therefore, for example, Patent Document 1 discloses a technique for confirming that the opening of the cleaning tank is closed by a lid.

  The tableware washing machine of patent document 1 is provided with a washing tub, a lid, a switching device, a control device, and a lid open / close detection device. The lid open / close detection device includes a magnet and a reed switch. The magnet is disposed on the lid. The reed switch is disposed at a position facing the magnet at the upper end of the cleaning tank. In a state where the lid closes the upper end opening of the cleaning tank, the magnet and the reed switch are close to each other. When the magnet and the reed switch are close to each other, the reed switch transmits a signal to the control device. The control device can detect that the opening of the cleaning tank is closed by the lid by receiving a signal from the lid open / close detection device.

JP 2000-139798 A

  In the dishwasher of Patent Document 1, a device for detecting the blockage of the opening of the washing tub, such as a lid opening / closing detection device, is arranged, the number of parts is greatly increased, and the structure of the dishwasher becomes complicated.

  The present invention was created to solve the above problems, and its purpose is to drive the injection device after the control device detects the clogging of the opening of the cleaning tank while suppressing an increase in the number of components. Is to provide technology that can be.

The dishwasher of this invention is equipped with the washing tank, the water supply apparatus, the intake path, the exhaust path, the fan, the injection apparatus, and the control apparatus.
Tableware is stored in the washing tank. The water supply device supplies cleaning water into the cleaning tank. The intake path reaches from the outside to the inside of the cleaning tank. The exhaust path reaches from the inside to the outside of the cleaning tank. The fan is disposed in one of the intake path and the exhaust path. The fan introduces air outside the cleaning tank into the cleaning tank via the intake path and exhausts air inside the cleaning tank outside the cleaning tank via the exhaust path. The injection device sucks the cleaning water supplied into the cleaning tank and injects it into the cleaning tank. The control device is in a state in which the opening on the side of the cleaning tank of the path where the fan is not arranged among the intake path and the exhaust path is blocked by the cleaning water supplied by the water supply device and the fan is driven Thus, when the index determined based on at least one of the rotational speed of the fan and the power consumption is within the reference index range, the injection device is driven.

For example, it is assumed that the fan is disposed in the intake path. When the fan is driven, air outside the cleaning tank is introduced into the cleaning tank through the intake path. If the opening on the cleaning tank side of the exhaust path is blocked by the cleaning water supplied by the water supply device, the air in the cleaning tank is not exhausted outside the cleaning tank from the exhaust path. For this reason, when the opening of the cleaning tank is closed by the lid (closed state), the air introduced into the cleaning tank by the fan is not exhausted outside the cleaning tank, and the fan runs idle. On the other hand, in the state where there is a gap between the cleaning tank and the lid (blockage failure state), air introduced into the cleaning tank by the fan is exhausted from the cleaning tank and the lid to the outside of the cleaning tank. The fan sends air without spinning.
Alternatively, for example, it is assumed that a fan is disposed in the exhaust path. When the fan is driven, the air in the cleaning tank is exhausted outside the cleaning tank through the exhaust path. If the opening on the washing tank side of the intake path is blocked by the cleaning water supplied by the water supply device, air outside the cleaning tank is not introduced into the cleaning tank from the intake path. For this reason, in the closed state, air outside the cleaning tank is not introduced into the cleaning tank by the fan, and the fan runs idle. On the other hand, in the poorly closed state, air outside the cleaning tank is introduced into the cleaning tank from the gap between the cleaning tank and the lid by the fan, so the fan sends out air without spinning.
There is a large difference in the number of revolutions and power consumption of the fan when the fan is idle and when the fan is sending air without idling. From this, it is possible to detect whether or not it is in a closed state using an index determined based on at least one of the rotational speed of the fan and power consumption.

For example, it is assumed that the number of rotations of a fan driven with constant power consumption is used as an index. In this case, the rotational speed of the fan in the closed state in which the fan is idle becomes larger than the rotational speed of the fan in the poorly closed state in which air is sent without being idle. Alternatively, for example, it is assumed that the power consumption of a fan driven at a constant rotational speed is used as an index. In this case, the power consumption of the fan in the closed state where the fan is idle is smaller than the power consumption of the fan in the blocked state where the fan is not idle and sends out air. When the fan is in a steady state, the index is a value within a certain range in the closed state. This is the reference index range.
In the dishwasher of the present invention, when the index determined by at least one of the rotational speed of the fan and the power consumption is within the reference index range, it is detected that it is in the closed state. Thus, the control device drives the injection device only when it is confirmed that it is in the closed state.

  The dishwasher preferably further includes a thermistor that measures the temperature of the air to obtain a measured temperature, and a storage device that stores a reference index range corresponding to each of the plurality of temperature ranges. At this time, the control device preferably drives the injection device when the index is within the reference index range corresponding to the temperature range including the measured temperature obtained by the thermistor.

  The power characteristic of the fan varies depending on the temperature of the fan drive unit (motor or the like). The temperature of the fan drive unit changes according to the temperature of the air around the fan. In the dishwasher, the reference range of the index can be changed according to the temperature of the air that affects the power characteristics of the fan. According to this configuration, the closed state can be detected even when the power characteristic of the fan changes depending on the temperature of the air.

The storage device preferably stores an index determination time corresponding to each temperature range in addition to the normal index range. At this time, the control device, when the index after the elapse of the index determination time corresponding to the temperature range including the measured temperature from the start of rotation of the fan is within the reference index range corresponding to the temperature range including the measured temperature, It is preferable to drive the injection device.
In order for the index to reach a steady state, a certain amount of time is required from the start of driving the fan. This is because a certain amount of time is required from the start of driving the fan until the rotation of the fan reaches a steady state. The time until the rotation of the fan reaches a steady state varies depending on the temperature of the air in the cleaning tank. The index determination time in each temperature range is set longer than the time from the start of driving the fan to the steady state. In this dishwasher, the control device enables the injection device to be driven by an index after an index determination time corresponding to the temperature of the air passing through the fan, that is, an index after the fan has reached a steady state. It can be determined whether or not.

  As described above, for the indicator, for example, the fan rotation speed when the fan is driven at a constant power consumption or the power consumption of the fan when the fan is driven at a constant rotation speed should be adopted. Can do. Normally, since the fan is driven at a steady voltage, the power consumption of the fan can be detected, for example, by measuring a current value energized to the fan. The number of rotations of the fan and the current value energized to the fan can be easily detected without providing a special sensor. Therefore, when these are indexed, a dishwasher using the index can be manufactured at low cost.

  According to the dishwasher of the present invention, it is possible to accurately detect whether or not the opening of the cleaning tank is closed by the lid based on an index determined by at least one of the rotational speed of the fan and the power consumption. Thereby, in the tableware washing machine of the present invention, the injection device can be driven after detecting the blockage of the opening of the washing tank while suppressing the number of parts.

Hereinafter, preferred embodiments of the present invention will be described.
(Embodiment 1) In the dishwasher of the present embodiment, a water level detection device that detects that an amount of cleaning water necessary for the cleaning process or the rinsing process is stored in the cleaning tank is disposed.
(Embodiment 2) In the dishwasher of the present embodiment, the water level of the washing water when detected by the water level detection device is the opening on the washing tank side of the path where the fan is not arranged among the intake path and the exhaust path. Is positioned above the upper end of the cleaning tank, and is positioned below the lower end of the opening on the cleaning tank side of the path on which the fan is disposed.

(First embodiment)
A dishwasher according to a first 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 door 15 is provided with an operation panel 16 and an exhaust path 18. The operation panel 16 is provided with various buttons such as a start button, a lamp, and the like. The exhaust path 18 reaches from the inside of the cleaning tank 14 to the outside. The outer end of the cleaning tank 14 of the exhaust path 18 is located on the front surface of the door 15 (left side in FIG. 1), and an exhaust port 18 b is provided on the front surface of the door 15. An opening 18 a is provided at the end of the exhaust path 18 on the cleaning tank 14 side.
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 has an opening 14a at its upper end. The cleaning tank 14 accommodates a cleaning nozzle 20a of the spray device 20, a table basket 61, and the like. Various tableware 19 is held in the tableware basket 61.

  A lid 56 is disposed above the cleaning tank 14. The lid | cover 56 is connected with the washing tank 14 by the raising / lowering mechanism which is not shown in figure. 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 lid 56 is lowered to closely contact the opening 14a of the cleaning tank 14 and cover it. When the cleaning tank 14 is pulled out from the main body 12, the lid 56 rises and opens the opening 14 a of the cleaning tank 14.

  A suction recess 31 is formed on the bottom surface 39 of the cleaning tank 14. Below the bottom surface 39, the cleaning pump 27 of the injection device 20 is provided. The cleaning pump 27 rotates the impeller 28 by a built-in electric motor. The cleaning pump 27 can rotate the impeller 28 in one direction or in the opposite 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. When the cleaning pump 27 rotates the impeller 28 in one direction, the cleaning water is supplied to the cleaning nozzle 20a. The cleaning nozzle 20 a sprays the sent cleaning water into the cleaning tank 14.

  An electric heater 30 is mounted above the bottom surface 39 where the cleaning 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 is put in the cleaning tank 14, and detects the temperature of the air in the cleaning tank when the cleaning water is not put.

  A water level detector 45 is provided at the lower portion outside the front portion of the cleaning tank 14. The water level detector 45 has a water level chamber 46, a float 47, a bar 48, and a switch 49. The water level chamber 46 communicates with the suction recess 31 by a water level path 44. The float 47 is disposed in the water level chamber 46. The bar 48 is fixed to the float 47 and protrudes upward from the water level chamber 46. The switch 49 is disposed above the bar 48. When the cleaning water is supplied to the cleaning tank 14, the cleaning water is introduced into the water level chamber 46 through the water level path 44. The level of the cleaning water in the water level chamber 46 rises as the water level in the cleaning tank 14 increases. The float 47 rises as the washing water level in the water level chamber 46 rises. When the float 47 rises and the upper end of the bar 48 comes into contact with the switch 49, a signal is transmitted from the switch 49 to the controller 60 described later.

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 communicates with the bottom of the cleaning tank 14 via the drain channel 36. The cleaning pump 27 sends the cleaning water in the cleaning tank 14 to the drain hose 34 by rotating the impeller 28 in the reverse direction.
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 the water supply pipe 88. 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. When the water supply valve 41 is opened, cleaning water is supplied into the cleaning tank 14, and when the water supply valve 41 is closed, water supply into the cleaning tank 14 is stopped. The water supply valve 41 and the cleaning tank 14 are communicated with each other by a second water supply channel 43.

  An intake passage 63 is formed between the rear wall 33 of the main body 12 and the rear wall 51 of the cleaning tank 14. The intake path 63 reaches from the outside to the inside of the cleaning tank 14. A drying fan 52 is disposed in the intake path 63. The drying fan 52 rotates the fan 53 with a built-in motor. A constant electric power is supplied to the motor of the drying fan 52. The drying fan 52 is connected to the cleaning tank 14 via the intake path 63. An opening 63 a is formed on the side of the cleaning tank 14 in the intake path 63. The drying fan 52 is provided with a rotation speed sensor 50 that detects the rotation speed of the fan 53.

  A controller 60 is mounted in front of the dishwasher 10. As shown in FIG. 2, the operation panel 16, the cleaning pump 27, the heater 30, the water supply valve 41, the switch 49, the rotation speed sensor 50, the drying fan 52, and the thermistor 55 are connected to the controller 60. 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. Further, the memory 60b stores a cleaning start rotation speed database 100.

  As shown in FIG. 3, in the cleaning start rotational speed database 100, the rotational speed determination time 104 and the reference fan rotational speed range are associated with each of a plurality of temperature ranges 102 corresponding to the measured temperatures measured by the thermistor 55. A lower limit 106 and a reference fan rotation speed range upper limit 108 are recorded. The temperature range 102 indicates a range that is greater than or equal to the minimum value shown in each temperature range and less than the maximum value. The reference fan rotation speed range is a range from the reference fan rotation speed range lower limit 106 to the reference fan rotation speed range upper limit 108. For example, when the temperature range 102 is 15 ° C. or higher and lower than 20 ° C., the reference fan rotation speed range is 3425 r / min to 3525 r / min. In the reference fan rotation speed range, the upper limit and the lower limit are specified, but only the lower limit may be specified. In this case, the reference fan rotation speed range is a range equal to or more than the specified lower limit.

Next, the operation of the dishwasher 10 will be described with reference to the drawings. As shown in FIG. 4, the dishwasher 10 operates in the order of a blockage detection process (step S10), a cleaning process (step S12), a rinsing process (step S14), and a drying process (step S16).
FIG. 5 is a flowchart showing a processing procedure of the controller 60 in the blockage detection step of Step S10.
First, the user turns on a start button provided on the operation panel 16. When the start button is turned on, a signal is transmitted from the operation panel 16 to the controller 60. When receiving the signal from the operation panel 16, the controller 60 receives the measured temperature information of the thermistor 55 (step S20). Based on the measured temperature information, the controller 60 specifies the determination time of the rotation speed of the fan 53 and the reference fan rotation speed range from the cleaning start rotation speed database 100 stored in the memory 60b (step S22). In this embodiment, it is assumed that the temperature of the thermistor 55 is 15 ° C. In this case, the rotational speed of the fan 53 is determined 60 seconds after the fan 53 is driven.

  The controller 60 opens the water supply valve 41 to supply cleaning water into the cleaning tank 14 (step S24). When receiving a signal from the switch 49 of the water level detector 45, the controller 60 closes the water supply valve and stops water supply (step S26). As shown in FIG. 1, the water level 58 of the cleaning water in the cleaning tank 14 is located above the upper end of the opening 18 a of the exhaust path 18 when the water supply is completed. That is, the opening 18a of the exhaust path 18 is blocked by the cleaning water. Further, the water surface 58 of the cleaning water in the cleaning tank 14 is located below the lower end of the opening 63 a of the intake passage 63. That is, the opening 63a of the intake passage 63 is not blocked by the cleaning water.

  When the water supply into the cleaning tank 14 is completed, the controller 60 drives the drying fan 52 (step S28) and rotates the fan 53. The controller 60 confirms whether 60 seconds, which is the rotation speed determination time, has elapsed since the drying fan 52 was driven (step S30). If it has not elapsed (NO in step S30), the controller 60 repeats step S30 until 60 seconds have elapsed. When the rotation speed determination time has elapsed (YES in step S30), the controller 60 activates the rotation speed sensor 50 (step S32) and detects the rotation speed of the fan 53.

  FIG. 6 is a graph showing changes in the rotational speed of the fan 53 over time. The graph of FIG. 6 gives an example in which the measurement temperature of the thermistor 55 is 15 ° C. The horizontal axis in FIG. 6 indicates the elapsed time (seconds) after the drying fan 52 is driven, and the vertical axis indicates the rotational speed (r / min) of the fan 53. Dashed lines 132 and 134 indicate the lower limit 106 and the upper limit 108 of the reference fan speed range, respectively. A solid line 140 indicates a change in the rotation speed of the fan 53 when the rotation speed of the fan 53 is equal to the reference fan rotation speed when the rotation speed determination time has elapsed. A solid line 142 indicates a change in the rotational speed of the fan 53 when the rotational speed of the fan 53 is smaller than the lower limit of the reference fan rotational speed range when the rotational speed determination time has elapsed.

  In the closed state, the air introduced into the cleaning tank 14 by the fan 53 is not exhausted outside the cleaning tank 14, and the fan 53 runs idle. On the other hand, in the blockage failure state, the air introduced into the cleaning tank 14 by the fan 53 is exhausted from the gap between the cleaning tank 14 and the lid 56, so that the fan 53 sends out air without spinning. Therefore, when constant power is supplied to the motor of the drying fan 52, the rotational speed of the fan 53 in the closed state becomes larger than the rotational speed of the fan 53 in the closed state. In the graph of FIG. 6, a solid line 140 indicates a change in the rotation speed of the fan 53 in the closed state, and a solid line 142 indicates a change in the rotation speed of the fan 53 in the blocked state.

  When the rotational speed of the fan 53 is detected, the controller 60 checks whether or not the detected rotational speed of the fan 53 is within the reference fan rotational speed range (step S34). When the rotational speed of the fan 53 is within the reference fan rotational speed range (YES in step S34), that is, when the rotational speed of the fan 53 is indicated by the solid line 140 in FIG. The sensor 50 is stopped (step S36), and the blockage detection process is terminated. When the blockage detection process is completed through step S <b> 36, the opening 14 a of the cleaning tank 14 is blocked by the lid 56. The controller 60 proceeds to the cleaning process shown in step S12 of FIG. In the cleaning process, the controller 60 drives the cleaning pump 27 of the injection device 20 to inject cleaning water into the cleaning tank 14.

  On the other hand, when the rotational speed of the fan 53 is outside the reference fan rotational speed range (NO in step S34), that is, when the rotational speed of the fan 53 is indicated by a solid line 142 in FIG. The rotation speed sensor 50 is stopped (step S38). In a state where the rotation speed of the fan 53 is indicated by a solid line 142, for example, the tableware 19 accommodated in the cleaning tank 14 comes into contact with the lid 56, or foreign matter enters between the lid 56 and the cleaning tank 14. The opening 14 a of the cleaning tank 14 is not closed by the lid 56. In this case, the controller 60 transmits a warning signal indicating that there is a gap between the cleaning tank 14 and the lid 56 to the operation panel 16 (step S40), and ends the process. The operation panel 16 turns on a warning lamp or displays a warning according to the transmitted warning signal. When the blockage detection process is completed through step S40, the controller 60 does not proceed to the cleaning process shown in step S12 of FIG.

In the dishwasher 10, blockage detection is performed in a state where the opening 18a of the exhaust path 18 is blocked. In this case, in the closed state where there is no gap between the opening 14a of the cleaning tank 14 and the lid 56, the air in the cleaning tank 14 is not exhausted outside the cleaning tank 14, and the fan 53 is idle. On the other hand, in a poorly closed state where there is a gap between the opening 14 a of the cleaning tank 14 and the lid 56, the air introduced into the cleaning tank 14 from the intake passage 63 is between the opening 14 a of the cleaning tank 14 and the lid 56. Since the air is exhausted outside the cleaning tank 14 through the gap, the fan 53 does not idle. As a result, the rotational speed of the fan 53 that rotates with constant power is smaller in the closed failure state than in the closed state.
In the dishwasher 10, blockage detection is performed by utilizing the fact that the rotation speed of the fan 53 is different between the blockage state and the blockage failure state. According to the dishwasher 10, the lid open / close detection device using a magnet and a reed switch is not necessary.

(Second embodiment)
In the above-described dishwasher 10 of the first embodiment, the drive of the injection device 20 is controlled based on the number of rotations of the fan 53 that is driven with constant power. Instead of this, the drive of the injection device 20 may be controlled based on the value of the current supplied to the motor of the drying fan 52 when the rotational speed of the fan 53 is kept constant.
Hereinafter, in a state where the motor of the drying fan 52 is driven at a steady voltage (for example, an AC voltage of 100 V), a current value for energizing the motor of the drying fan 52 so as to maintain the rotation speed of the fan 53 at 3500 r / min. The dishwasher of the second embodiment for controlling the opening and closing of the water supply valve 41 based on the current value energized to the motor when the control is performed will be described with reference to the drawings. FIG. 7 is a longitudinal sectional view of the dishwasher 200 of the second embodiment. Here, the same components as those in the dishwasher 10 are denoted by the same reference numerals as those in FIG.

  In addition to the fan 53, the rotation speed sensor 50, and the motor, the drying fan 52 is provided with an ammeter 254 that measures a current value energized to the motor. As shown in FIG. 8, the ammeter 254 is connected to the controller 260 of the dishwasher 200. Each device of the dishwasher 200 is connected to the controller 260 similarly to the controller 60 of the dishwasher 10. The controller 260 controls the operation of each connected device by the built-in CPU 260a, memory 260b, and the like. The memory 260b stores information for controlling each device. The memory 260b stores a cleaning start current value database 210.

  As shown in FIG. 9, in the cleaning start current value database 210, the current value determination time 214 and the reference current value range lower limit are associated with each of the plurality of temperature ranges 212 corresponding to the measured temperatures measured by the thermistor 55. 216 and a reference current value range upper limit 218 are recorded. The temperature range 212 indicates a range that is greater than or equal to the minimum value shown in each temperature range and less than the maximum value. The reference current value range is a range up to a reference current value range lower limit 216 and a reference current value range upper limit 218. For example, when the temperature range 212 is 15 ° C. or higher and lower than 20 ° C., the reference current value range is 0.2325A to 0.2425A. In the cleaning start current value database 210, the upper limit and the lower limit of the reference current value range are specified, but only the upper limit may be specified. In this case, the reference current value range is a range below the specified upper limit.

Next, the operation of the dishwasher 200 will be described with reference to the drawings. As shown in FIG. 4, the dishwasher 200 operates in the order of the blockage detection process, the cleaning process, the rinsing process, and the drying process, like the dishwasher 10. FIG. 10 is a flowchart showing a processing procedure of the controller 260 in the blockage detection step of step S10. 10, the same processes as those in FIG. 5 are denoted by the same reference numerals as those in FIG.
First, the user turns on a start button provided on the operation panel 16. When the start button is turned on, a signal is transmitted from the operation panel 16 to the controller 260. When the controller 260 receives a signal from the operation panel 16, the controller 260 determines the current value determination time and the reference current from the cleaning start current value database 210 stored in the memory 260b based on the measured temperature information received in step S20. A value range is specified (step S202). In this embodiment, it is assumed that the temperature of the thermistor 55 is 18 ° C. In this case, the value of the current supplied to the motor of the drying fan 52 is determined 60 seconds after the drying fan 52 is driven. The controller 260 performs the processing from step S24 to step S32.

  The controller 260 confirms whether or not the rotational speed of the fan 53 detected by the rotational speed sensor 50 has reached a predetermined value of 3500 r / min (step S204). If not reached (NO in step S204), the controller 260 adjusts the value of the current supplied to the motor of the drying fan 52 until the rotational speed of the fan 53 reaches 3500 r / min, and repeats step S204. When the rotational speed of fan 53 reaches 3500 r / min (YES in step S204), controller 260 measures the value of the current supplied to the motor of drying fan 52 by ammeter 254 (step S206).

When the current value energized by the motor of the drying fan 52 is measured, the controller 260 checks whether or not the current value measured by the ammeter 254 is within the reference current value range (step S208). When the current value measured by the ammeter 254 is within the reference current value range (YES in step S208), the controller 260 proceeds to the process of step S36 and ends the blockage detection process. Subsequently, the controller 260 proceeds to the cleaning step shown in step S12 of FIG. In the cleaning process, the controller 60 drives the cleaning pump 27 of the injection device 20 to inject cleaning water into the cleaning tank 14.
On the other hand, when the current value measured by the ammeter 254 is outside the reference current value range (NO in step S208), the opening 14a of the cleaning tank 14 is not closed by the lid 56. In this case, the controller 260 executes steps S38 and S40 and ends the blockage detection process.

In the dishwasher 200, the motor of the drying fan 52 in which the fan 53 rotates at a constant number of rotations is more in the blocked state where the fan 53 is not idle and the air is sent out without being idle. The current value energized to increases.
In the dishwasher 200, the blockage is detected by utilizing the fact that the current value supplied to the drying fan 52 is different between the closed state and the closed state. According to the dishwasher 200, a lid open / close detection device using a magnet and a reed switch is not necessary.

  Further, in each of the dishwashers 10 and 200 described above, the reference index range is changed depending on the temperature of the air in the cleaning tank 14. Thereby, even if the power characteristic of the drying fan 52 changes due to a change in temperature, the blockage can be detected. The dishwasher 10, 200 may be a thermistor that measures the temperature of the air outside the dishwasher 10 instead of the thermistor 55, and measures the temperature of the air near the fan 53 in the intake passage 63. It may be a thermistor. Further, before the temperature is measured by the thermistor 55, the fan 53 may be rotated in advance.

In the dishwasher 10 described above, the drying fan 52 is disposed in the intake path 63. However, a fan may be disposed in the exhaust path 18. In this case, the opening 63 a of the intake passage 63 is disposed below the water level 58 detected by the water level detector 45. On the other hand, the opening 18 a of the exhaust path 18 is disposed above the water level 58. Even with this configuration, the same effects as those of the first and second embodiments can be obtained.
Further, the drying fan 52 may be disposed in both the exhaust path 18 and the intake path 63. In this case, either the opening 18 a of the exhaust path 18 or the opening 63 a of the intake path 63 is disposed below the water level 58 detected by the water level detector 45. For example, when the opening 18a of the exhaust path 18 is disposed below the water level 58, at least the rotation speed and power consumption of the fan 53 are in a state where the drying fan 52 disposed in the intake path 63 is driven. Blockage detection is performed using an index determined based on one side. On the other hand, when the opening 63a of the intake path 63 is disposed below the water level 58, the rotational speed and power consumption of the fan 53 are driven while the drying fan 52 disposed in the exhaust path 18 is being driven. Blockage is detected using an index determined based on at least one of them.

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 tableware washing machine of 1st Example. The block diagram which shows the control system of the dishwasher of 1st Example. The figure which shows the washing | cleaning start rotation speed database of 1st Example. The flowchart which shows the driving | operation operation | movement of a dishwasher. The flowchart which shows the obstruction | occlusion detection process of 1st Example. The graph which shows the change of the rotation speed of the fan by the time of 1st Example. The cross-sectional schematic diagram of the tableware washing machine of 2nd Example. The block diagram which shows the control system of the dishwasher of 2nd Example. The figure which shows the washing | cleaning start electric current value database of 2nd Example. The flowchart which shows the obstruction | occlusion detection process of 2nd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 200: Dishwasher 12: Main body 14: Washing tank 14a: Opening 15: Door 18: Exhaust path 18a: Opening 20: Injection device 56: Lid 63: Intake path 63a: Opening 100: Washing start rotation speed database 210: Cleaning start current value database 254: Ammeter

Claims (4)

A washing tank for storing tableware;
A water supply device for supplying cleaning water into the cleaning tank;
An intake path reaching from the outside to the inside of the washing tank;
An exhaust path reaching from the inside to the outside of the washing tank;
A fan that is disposed on one of the intake path and the exhaust path, introduces air outside the cleaning tank into the cleaning tank via the intake path, and exhausts air inside the cleaning tank to the outside of the cleaning tank via the exhaust path;
An injection device that sucks the cleaning water supplied into the cleaning tank and injects it into the cleaning tank;
A control device for controlling the drive of the injection device;
With
The control device is in a state in which the opening on the side of the cleaning tank of the path where the fan is not arranged among the intake path and the exhaust path is blocked by the cleaning water supplied by the water supply device and the fan is driven Thus, the dishwasher is characterized in that when the index determined based on at least one of the rotational speed of the fan and the power consumption is within the reference index range, the spray device is driven. A thermistor that measures the temperature of the air to obtain the measured temperature; and
A storage device storing a reference index range corresponding to each of a plurality of temperature ranges;
Further comprising
2. The dishwasher according to claim 1, wherein the control device drives the spray device when the index is within a reference index range corresponding to a temperature range including the measured temperature obtained by the thermistor. The storage device stores the index determination time corresponding to each temperature range in addition to the reference index range,
When the index after the index determination time corresponding to the temperature range including the measured temperature from the time when the fan starts rotating is within the reference index range corresponding to the temperature range including the measured temperature, the control device The dishwasher according to claim 2, wherein the dishwasher is driven. The index is one of a fan rotation speed when the fan is driven at a constant power consumption and a power consumption of the fan when the fan is driven at a constant rotation speed. The dishwasher as described in any one of 1-3.

Images