JP3362461B2 - Dishwasher - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher used in ordinary households. [0002] A conventional dishwasher will be described below. As shown in FIG. 7, a conventional dishwasher dries a dish basket 21 in which a dish 20 or the like to be washed is stored in a predetermined place, and then starts operation by adding a detergent. . First, a predetermined amount of cleaning water 23 is supplied to a cleaning tank 24 by the operation of a water supply valve 22, and then a cleaning pump 25 is supplied.
The cleaning water 23 pressurized by the above is jetted from the cleaning nozzle 26 together with the detergent. Thus, the main washing step is performed. In the main washing step, the heater 27 provided in the washing tank 24 is energized to heat the washing water 23 to a predetermined washing temperature. After a main washing step for a predetermined time, the washing water 23 containing the dirt washed off from the article 20 to be washed such as tableware is drained by a drain pump 28. Subsequently, the cleaning water 23 is newly supplied, and the cleaning object 23 is jetted from the cleaning nozzle 26 to clean the object 20 to be cleaned, which is contaminated with detergent or garnish (the food adhered to the tableware as garbage is called garbage). After rinsing, the process of discharging the washing water 23 out of the machine is repeated four times continuously, and the rinsing process is completed. Note that the residual vegetables are collected in a filter 29 provided in the washing tank 24. [0006] Following the rinsing step, a drying step is performed. In this drying step, the ventilation fan 30 is operated, and air outside the apparatus is sent to the heater 27 via the air inlet filter 31 and the ventilation duct 32. The sent air is heater 2
7 and is supplied to the cleaning tank 24. Then, the object to be cleaned 20 is dried and discharged to the outside of the apparatus via the exhaust port filter 33. After a predetermined time, the drying step is completed, and the operation of the dishwasher is completed. [0007] However, in the conventional configuration, stopping the ventilation fan 30 during the drying process,
Since the abnormality such as clogging of the intake port filter 31 and the exhaust port filter 33 cannot be detected, when the above-mentioned abnormality occurs, the air in the cleaning tank 24 is not discharged out of the apparatus, and the air heated by the heater 27 is further discharged. Items to be washed 20 such as tableware
Therefore, there is a problem that poor drying occurs and thermal deformation of tableware is deteriorated due to a partial temperature rise. SUMMARY OF THE INVENTION In view of the above problems, the present invention notifies a user of abnormalities such as stoppage of a ventilation fan and clogging of an intake filter and an exhaust filter, thereby preventing defective drying in advance and ensuring stable operation. to provide a dishwasher to ensure drying performance and purpose. [0009] According to one aspect of the present onset bright in order to achieve this purpose, a cleaning tank, dishware basket for containing the dishes, and wash pump for circulating the cleaning water in the cleaning tank, a washing nozzle having an injection hole for injecting wash water to dishes, a heater for heating washing water and tableware, a temperature detecting element provided in the vicinity of the heater, a ventilation fan for ventilating the cleaning tank, communicating said ventilating fan and said cleaning tank, the air inlet Fi
A ventilation duct for supplying outside air taken in through the filter to the washing tank, and an exhaust port for discharging air from the washing tank.
Comprising a filter, a control device for controlling the energization of such the washing pump and the heater, the control device, the drying process smell
To detect the energizing time and non-energizing time of the heater
A state detection device, and an output of the conduction state detection device.
The average power of the heater is calculated and
Or an abnormality of the intake filter or exhaust filter
It is something to do . According to the present invention having the above-described structure, during the drying process, the control device turns on or off the heater so that the temperature of the heater obtained from the temperature detecting element becomes a predetermined drying temperature. At the same time, the control device calculates the energized state of the heater from the time when the heater is energized and the time when it is not energized. If the energized state does not satisfy the drying predetermined energized state, it is determined that air is not normally supplied to the heater, and a notification is made during the drying process that there is an abnormality in the ventilation fan, the intake port filter, and the exhaust port filter. Is what you can do . Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a washing tank, 2 is washing water 3
, A washing pump connected to the washing pump 4, and a plurality of spray ports 6 for spraying the washing water 3. 7 is a tableware basket for accommodating items to be washed 8 such as tableware in the washing tank 1, 9 is a drainage pump for discharging the washing water 3, 10 is a filter for collecting residual vegetables,
11 is a heater, 12 is a ventilation fan for supplying air to the heater 11, 13 is a ventilation duct connecting the cleaning tank 1 and the ventilation fan 12, and 14 is a temperature detecting element, which is provided near the heater 11 and detects the temperature of the heater 11. I do. Reference numeral 15 denotes a control device, in which an energization state detection device 16 for the heater 11 is provided. Reference numeral 17 denotes an intake port filter, and reference numeral 18 denotes an exhaust port filter. The operation of the above configuration will be described below. A predetermined amount of detergent is put into the washing tank 1 and the object 8 to be washed such as tableware is stored and the operation is started. Here, first, the cleaning water 3 is supplied by energizing the water supply valve 2. When the cleaning water 3 reaches a predetermined amount, the cleaning pump 4 pressurizes the cleaning water 3 containing the detergent and supplies the cleaning water 3 to the cleaning nozzle 5, whereby the cleaning water 3 is jetted from the injection port 6 provided in the cleaning nozzle 5. You. Thus, the main washing step is performed. In the main washing step, the heater 11 provided in the washing tank 1 is energized to supply the washing water 3.
Is heated to a predetermined temperature for washing. After the main washing step for a predetermined time, the washing water 3 containing the dirt washed off from the object to be washed 8 such as tableware is drained by the drain pump 9. Subsequently, the washing water 3 is newly supplied, and the washing water 3 is ejected from the washing nozzle 5 to rinse the object 8 to be washed, which is contaminated with the detergent and the residual vegetables, and then the washing water 3 is discharged outside the machine. This step is repeated four times in succession to complete the rinsing step. Residual vegetables are collected in a filter 10 provided in the washing tank 1. After the completion of the rinsing process, the process proceeds to the drying process. In the drying step, the ventilation fan 12 is operated,
The outside air is sent to the heater 11 through the air inlet filter 17 and the ventilation duct 13. Then, the heater 11 heats the sent air. At this time, as shown in FIG. 2, the control device 15 is controlled so that the temperature of the heater 11 becomes a predetermined drying temperature.
Turns on or off the heater 11. The heated air is supplied to the cleaning tank 1 to dry the cleaned object 8 for a predetermined time. The operation is ended after this drying step. According to the first embodiment of the present invention configured as described above, as shown in FIG. 2, in the drying step, the control unit 15 uses the power supply state detecting device 16 to supply the power supply time to the heater 11 and the power supply time to the non-power supply time. Heater 1
The average power can be calculated from the time when 1 is energized. Therefore, a case where the ventilation fan 12 stops will be described below. FIG. 2 shows the temperature and the energized state of the heater 11 when the ventilation fan 12 is operating normally. On the other hand, FIG. 3 shows the temperature of the heater 11 and the energized state when the ventilation fan 12 is stopped. When the ventilating fan 12 stops, the air outside the machine becomes the intake port filter 1.
7. The air is no longer fed into the heater 11 through the ventilation duct 13, so that high-temperature air always exists around the heater. For this reason, heat exchange between the heater 11 and the air is reduced, and the energizing time of the heater 11 is shortened and the non-energizing time is increased as compared with the case where the ventilation fan 12 is operating normally. Therefore, the average power of the heater 11 when the ventilation fan 12 is stopped is smaller than when the ventilation fan 12 is operating normally. From this, when the average power of the heater 11 calculated by the control device 15 is less than the predetermined dry power, it can be determined that there is an abnormality in the ventilation fan 12 and notified. If the air inlet filter 17 is blocked by clogging or the like, the outside air cannot be supplied to the heater 11 even if the ventilation fan 12 operates normally. Since the average power of 11 is less than the predetermined drying power, the control device 15 can determine that there is an abnormality in the intake port filter 17 and can report the abnormality. In addition, if the exhaust port filter 18 is blocked by clogging or the like, the air in the washing tank 1 cannot be sent out of the machine even if the ventilation fan 12 operates normally. Since the outside air cannot be supplied to the heater 11, the average power of the heater 11 becomes less than the predetermined drying power as described above, so that the control device 15 determines that there is an abnormality in the exhaust port filter 18 and gives a notification. Can be. Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. Since the entire configuration is the same as that of the first embodiment, the description is omitted. However, in FIG. 4, reference numeral 19 denotes a temperature change speed detecting device. FIG. 5 shows the heater 1 in the drying process.
1 shows the energized state of the heater 11 and the temperature of the temperature detecting element 14 when air is normally sent to the heater 1. FIG. 6 shows the energized state of the heater 11 and the temperature of the temperature detecting element 14 when air is not normally sent to the heater 11 in the drying process. 5 and 6, the temperature of the temperature detecting element 14 increases while the heater 11 is energized, and decreases while the heater 11 is not energized. According to the second embodiment of the present invention constructed as described above, the controller 15 turns on or off the heater 11 in the drying step. The temperature of 14 rises, and falls during non-energization. Then, the temperature change speed detecting device 19 reads the temperature change speed of the temperature detecting element 14. Therefore, a case where there is an abnormality such as stop of the ventilation fan 12 or clogging of the intake port filter 17 and the exhaust port filter 18 will be described below. Stopping of the ventilation fan 12 and the inlet filter 1
If there is an abnormality such as clogging of the filter 7 and the exhaust port filter 18, air outside the machine will not be sent to the heater 11,
There will always be hot air around the heater. For this reason, heat exchange between the heater 11 and the air is reduced, and as shown in FIGS.
Of the heater 11 is shorter and the non-energization time of the heater 11 is longer than in the case where is normally operating. Therefore, the temperature rising speed of the temperature detecting element 14 increases, and the temperature decreasing speed decreases. From this, when the temperature change speed of the temperature detecting element 14 detected by the temperature change speed detecting device 19 is higher than the temperature change speed in the normal state, or the temperature decrease speed is lower than the temperature change speed in the normal state. In such a case, the control device 15 can determine that there is an abnormality such as the stop of the ventilation fan 12 or the clogging of the intake port filter 17 and the exhaust port filter 18 and can be notified. Further, the controller 15 controls the heater 1 in the drying process.
Since the temperature rise rate and the temperature decrease rate of the temperature detecting element 14 during the drying process can be detected by simply energizing or de-energizing 1 once, the abnormality is notified in a short time after the start of the drying process. be able to. Although the present invention has been described with reference to the case where the heater 11 is exposed inside the cleaning tank 1, the same applies to the case where a heating device including the heater 11 is mounted outside the cleaning tank 1. As described above, the present invention provides a washing tank, tableware,
The washing water in the washing tank is circulated
Washing pump to spray washing water to tableware
Cleaning nozzle and heater for heating cleaning water and dishes
A temperature detection element provided in the vicinity of the heater;
A ventilation fan for ventilating the inside of the cleaning tank, the cleaning tank and the ventilation
Connect the fan and take in the air through the intake filter.
A ventilation duct for supplying air to the cleaning tank;
An exhaust port filter for discharging air, the heater and the
A control device for controlling the energization of the washing pump and the like is provided.
In the drying step, the control device controls the energization time of the heater and
It has an energization state detection device that detects the non-energization time.
The average power of the heater is calculated from the output of the
Outlet and ventilating fan or inlet filter or exhaust
Since the abnormality of the air filter is notified, the energized state of the heater is detected during the drying process, and if the energized state does not satisfy the predetermined drying state, the ventilation fan is stopped or the intake port filter and the exhaust port filter are stopped. It is determined that there is an abnormality such as clogging, and the abnormality can be notified to the user. As a result, it is possible to prevent poor drying in advance, can always be ensured a stable drying performance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional view of a dishwasher and dryer in a first embodiment of the present invention. FIG. 2 is a diagram showing a normal state of a heater temperature and energization of the heater in the first embodiment of the present invention. FIG. 3 is a view showing a state of a heater in an abnormal state and an energized state of the heater in the first embodiment of the present invention. FIG. 4 is a vertical section of a dishwasher in the second embodiment of the present invention. FIG. 5 is a diagram showing a temperature and a temperature change rate of a temperature detecting element in a normal state according to the second embodiment of the present invention. FIG. 6 is a diagram showing a temperature of the temperature detecting element in an abnormal state according to the second embodiment of the present invention. FIG. 7 is a longitudinal sectional view of a conventional dishwasher and dryer. [Description of References] 1 Washing tank 11 Heater 12 Ventilation fan 13 Ventilation duct 14 Temperature detecting element 15 Control device 16 Electric conduction state detecting device 19 Temperature Change speed detector

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-7721 (JP, A) JP-A-63-109834 (JP, A) JP-A-56-1137 (JP, A) (58) Investigation Field (Int.Cl. ⁷ , DB name) A47L 15/42

Claims (1)

(57) [Claims] [Claim 1] A washing tank, a tableware for storing tableware,
A wash pump for circulating the cleaning water in the cleaning tank, a cleaning nozzle having an injection hole for injecting wash water to dishes, a heater for heating washing water and tableware, temperature detection provided in the vicinity of the heater the element, a ventilation fan for ventilating the cleaning tank, communicating said ventilating fan and said cleaning tank, inlet off
A ventilation duct for supplying outside air taken in through the filter to the washing tank; and an exhaust port fan for discharging air in the washing tank.
Comprising a filter, a control device for controlling the energization of such the washing pump and the heater, the control device, the drying process smell
To detect the energizing time and non-energizing time of the heater
A state detection device, and an output of the conduction state detection device.
The average power of the heater is calculated and
Or an abnormality of the intake filter or exhaust filter
A dishwasher and dryer.