JPH06205735A - Dish washer/drier - Google Patents

Abstract

PURPOSE:To provide a dish washer/drier preventing the dissolution of resin dishes and a burn and capable of cleaning and removing the scale of the washing water stuck in a water feed pipe with a simple structure. CONSTITUTION:This dish washer/drier is provided with a heating unit 32 cast with a heating element 33 together with a water feed pipe 34 and a heat radiator 35 on nearly the same plane. A washing water circulation passage 25 is connected to the water feed pipe 34, the heat radiator 35 is connected to a ventilation duct 31, the washing water 5 is heated via the water feed pipe 34 at the time of washing, and hot air is fed into a washing tank 20 via the heat radiator 35 at the time of drying. The scale cleaning process in which the temperature of the heating unit 32 is set higher than the drying temperature is provided in the drying process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher / dryer used in general households.

[0002]

2. Description of the Related Art A conventional dishwasher / dryer will be described below with reference to FIG. After the tableware basket 3 containing the tableware 1 and small items 2 such as a spoon knife is stored in a predetermined place, a detergent is added to start the operation. When the operation is started, first, the water supply valve 4 operates to supply a predetermined amount of cleaning water 5 to the cleaning tank 6. Subsequently, the cleaning pump 7 is operated, and the pressurized cleaning water 5 is sprayed from the cleaning nozzle 8 together with the detergent. Thus, the main washing step is performed. In this main washing step, the heating unit 9 provided in the washing tank 6 is energized and the washing water 5 is heated to a predetermined temperature.

After the main washing process for a predetermined time, the drainage pump 10 is activated to drain the wash water 5 containing the dirt washed off from the dishes 1 and the small articles 2. Subsequently, the washing water 5 is newly sprayed from the washing nozzle 8, and the rinsing step of rinsing the tableware 1 soiled with detergent or leftover dishes (food left on the dishes as soil) is performed. To be done. At the end of this rinsing step, a discharging step of discharging the cleaning water 5 to the outside of the machine is executed again. This rinsing / drainage process is repeated four times in succession to complete the rinsing process. At this time, the residual food is collected in the filter 11 provided in the cleaning tank 6. When the rinsing step is completed, the heating unit 9 is energized to heat the inside of the cleaning tank 6 to a predetermined temperature. Thus
A drying process of drying the tableware 1 is performed. After the drying process for this predetermined time is completed, the entire cleaning is completed.

[0004]

In this conventional dishwasher / dryer, since the heating unit 9 is in the washing tank 6, resin dishes or the like fall out of the dish basket 3 and the heating unit 9 is removed.
When a drying process is started in contact with the tableware, there is a problem that the tableware is melted by the heating of the heating unit 9 or the user comes into contact with the heating unit and burns when taking out the tableware.

In order to solve this problem, there is also a dishwasher / dryer in which a running water pipe brazed with a sheathed heater is used as a part of the wash water circulating water passage. However, in the case of this configuration, the drying process must be performed by another heating unit, resulting in an increase in cost. In addition, the scale in the wash water adheres to the inside of the running water pipe, and there are problems such as deterioration of thermal efficiency and disconnection of the temperature fuse due to abnormal heat generation of the heating unit.

The present invention is intended to solve the problems of the conventional structure as described above, and prevents the resin tableware from being melted or burned, and has a simple structure for the scale of the cleaning water attached to the running water pipe. The first purpose is to provide a dishwasher capable of cleaning and removing.

A second object of the present invention is to provide a dishwasher / dryer capable of more strongly cleaning and removing the scale in the running water pipe.

A third object of the present invention is to provide a dishwasher / dryer capable of detecting the amount of scale adhered in the running water pipe and automatically cleaning the scale if necessary.

[0009]

[Means for Solving the Problems] A first means of the present invention for achieving the first object is to provide a washing tank, a dish basket for storing dishes arranged in the washing tank, and a washing water. A cleaning pump for supplying the cleaning pump, a cleaning nozzle for supplying water into the cleaning tank by receiving water supply from the cleaning pump, a cleaning water circulating water channel for supplying cleaning water to the cleaning nozzle, and a ventilation duct for communicating the inside of the cleaning tank with the outside air, A heating unit composed of a heating element, a flowing water pipe through which wash water circulates, and a radiator provided in a ventilation duct;
The dishwasher / dryer is provided with a control device for controlling these, and provided with a scale cleaning step for setting the temperature of the heating unit higher than the normal drying temperature during the drying step.

A second means of the present invention for achieving the second object is a washing tank, a dish basket containing dishes placed in the washing tank, and a washing pump for supplying washing water. , The cleaning nozzle that receives the water supply from this cleaning pump and supplies it to the cleaning tank, the cleaning water circulation channel that sends the cleaning water to the cleaning nozzle, the ventilation duct that connects the inside of the cleaning tank and the outside air, the heating element, and the cleaning water. A scale provided with a heating unit including a radiator provided in a circulating water pipe and a ventilation duct, and a control device for controlling these, and a scale for operating a washing pump after the heating unit is baked to a predetermined temperature during a washing process. It is a dishwasher with a cleaning process.

A third means of the present invention for achieving the third object is a dishwasher / dryer which performs a scale cleaning step when the heating unit exceeds a predetermined temperature during the cleaning step.

[0012]

The first means of the present invention is that the heating unit is provided outside the cleaning tank in association with the water flow pipe and the ventilation duct.
By providing a scale cleaning process in which the temperature setting of the heating unit is higher than the normal drying temperature during the drying process, even if the heating unit is burnt in the drying process, the tableware will melt or burn when taking out the tableware. It is possible to prevent such problems as described above, and it is possible to prevent the scale from adhering to the inside of the running water pipe, resulting in a decrease in thermal efficiency and the disconnection of the thermal fuse.

In a second aspect of the present invention, in the scale cleaning step, by setting the temperature of the heating unit to a high temperature and operating the cleaning pump, heat shock due to cleaning water is applied to the inside of the running water pipe to further improve the scale. It works easily to drop.

Further, according to the third means of the present invention, when the scale adheres to the running water pipe of the heating unit to reduce the heat transfer coefficient between the running water pipe and the washing water, and the temperature of the heating unit rises during the washing process. The scale cleaning process is automatically executed, and the scale is automatically cleaned as needed.

[0015]

【Example】

(Embodiment 1) An embodiment of the first means of the present invention will be described below with reference to the accompanying drawings with reference to FIGS.
20 is a cleaning tank for storing dishes, 21 is a water supply valve for supplying the cleaning water 5 into the cleaning tank 20, 22 is a cleaning pump for supplying cleaning water, 23 is a cleaning nozzle, and a plurality of cleaning water 5 are sprayed. It has the injection port 24 of. Reference numeral 25 denotes a wash water circulating water channel for supplying wash water from the wash pump 22 to the wash nozzle 23. Further, 26 is a filter for collecting the leftover food, and a drain port 28 communicating with the suction port of the cleaning pump 22 and the suction port of the drainage pump 27 is provided in the lower part thereof. Reference numeral 29 is a tableware basket for storing items to be cleaned such as tableware in the cleaning tank 20, 30 is a ventilation fan for blowing air into the cleaning tank 20, and 31 is a ventilation duct for sending air from the ventilation fan 30 to the cleaning tank 20. A heating unit 32 includes a heating element 33 formed of a sheathed heater and a stainless steel running water pipe 3.
It is formed by being cast into aluminum, which is a good conductor of heat, together with No. 4. In this embodiment, the heating unit 32 is provided on the rear surface outside the cleaning tank 20. In addition, the running water pipe 34,
The wash water circulating water passage 25 is connected. Further, the heating unit 32 is also integrally provided with a radiator 35 that is connected to the ventilation duct 31 and is a part of the ventilation duct.
A temperature detecting element 36 detects the surface temperature of the heating unit 32 and is composed of a negative thermistor. A control device 37 controls the cleaning pump 22 and the heating unit 32. 38 is a tableware.

FIG. 3 shows a control program in the cleaning process / drying process which the controller 37 has, and 39 shows the temperature of the heating unit 32 during the process. Again 39
Reference numeral a denotes a scale cleaning process for removing scale adhering to the running water pipe 4, which is a process in which the temperature of the heating unit is set higher than the normal drying temperature during the drying process.

When a predetermined amount of detergent is added and the operation is started, the control device 37 operates to first energize the water supply valve 21 to supply the cleaning water 5 to the cleaning tank 20. When the cleaning water 5 reaches a predetermined amount, the cleaning pump 22 pressurizes the cleaning water 5 containing a detergent and supplies it to the cleaning nozzle 23. Thus the cleaning nozzle 2
The washing water is sprayed from 3 to start the main washing step of washing the dishes 38. During the main washing process, the heating element 33 forming the heating unit is energized to heat the washing water 5. That is, when the wash water 5 circulates through the running water pipe 34 and the wash water circulating water passage 25, heat exchange is performed and the wash water 5 is heated. Then, after the temperature of the washing water 5 reaches a predetermined level, the main washing process is completed.

When the main washing step is completed, the rinsing step and the drying step are performed. In the drying process, the ventilation fan 30 is energized to send outside air into the cleaning tank 20 through the ventilation duct 31. In the drying process, the heating element 33 is energized to heat the heating unit 32. At this time, the temperature of the heating unit 32 is adjusted to 140 ° C. by the temperature detecting element 36 and the controller 37. Therefore heating unit 3
The heat dissipating member 35 forming part 2 radiates heat to the air flowing in the ventilation duct 31 and heats the air. The heated air becomes hot air and is supplied to the washing tank 20 to dry the washed dishes 38.

In this embodiment, a scale cleaning step 39a is provided for temporarily raising the temperature of the heating unit 32 to 170 ° C during this drying step. In this scale cleaning process, the temperature of the heating unit 32 is temporarily raised to 170 ° C., and the stainless water pipe 34 is thermally expanded. That is, due to the difference in the coefficient of thermal expansion between the scale in the wash water, which has calcium carbonate, silica or the like as the main component attached to the inner wall of the running water pipe 34, and the running water pipe 34 made of stainless steel, the scale is separated. . Thus the running water pipe 3
No. 4 was cleaned and no scale adhered.
The operation of the dishwasher is finished after the drying process of the predetermined time.

As described above, according to the dishwasher of the first embodiment of the present invention, the washing water 5 is heated through the running water pipe 34 during washing, and the air is heated through the radiator 35 during drying. Then, the warm air is supplied into the washing tank 20 to dry the dishes 38, so that the washing / drying can be constituted by one heating unit 32. In addition, since the heating unit 32 is provided outside the cleaning tank 20, it is possible to prevent the tableware from melting or being burned, which has conventionally occurred. Further, since the scale cleaning step 39a for setting the temperature of the heating unit 32 higher than the normal drying temperature is provided during the drying step, it is possible to maintain the thermal efficiency and prevent the thermal fuse from breaking. is there.

(Embodiment 2) Next, an embodiment of the second means of the present invention will be described with reference to FIG. The overall structure of this embodiment is similar to that of the first embodiment and is as shown in FIGS. FIG. 4 shows a temperature control program included in the control device 37 of this embodiment. 40 indicates the temperature inside the cleaning tank 20, and 41 indicates the temperature of the heating unit 32.

As the control device 37 provided with the temperature control program as described above, the present embodiment operates so that the scale can be removed more reliably than the first embodiment. In other words, in the present embodiment, the heating element 33 is energized and the temperature of the heating unit 32 is reduced to about halfway during the cleaning process.
It has been raised to 170 ° C. Further, in this state, the cleaning pump 22 is operated to supply the cleaning water 5 to the running water pipe 3
It is what is poured into 4. Therefore, due to the effects of both the difference in thermal expansion between the stainless steel running water pipe 34 and the scale in the wash water and the heat shock received by the running water pipe 34, the attached scale can be more easily peeled off. Is.

As described above, the dishwasher / dryer of this embodiment is
During the cleaning process, the heating element 33 is energized to raise the temperature of the heating unit 32 to 170 ° C, and the cleaning pump 22
By providing a scale cleaning process to operate
The scale attached to the running water pipe 34 can be strongly cleaned and removed.

In the present embodiment, the scale cleaning step 42 is performed in the first half of the main washing step, but the same effect can be obtained even if the scale cleaning step 42 is provided in the rinsing step.

(Embodiment 3) Next, an embodiment of the third means of the present invention will be described with reference to FIG. The overall configuration of this embodiment is similar to that shown in FIGS. 1 and 2 described in the first embodiment. FIG. 5 shows the experimental results. Reference numeral 45 denotes the temperature inside the cleaning tank 20 during the cleaning and drying steps, and 4
6 shows the temperature of the heating unit 32 when there is no scale in the running water pipe 34, and 47 shows the temperature of the heating unit 32 when the scale adheres to the running water pipe 34. Reference numeral 48 indicates a detected temperature for executing the scale cleaning process.

According to the experiment, the surface density of the running water pipe 34 is 10
At the time of W / cm ² , the temperature difference between the temperature inside the tank indicated by 45 and the heating unit 32 indicated by 46 is about 50 deg. When the scale adheres to the inside of the running water pipe 34, the heating unit temperature rises as indicated by 47. Four
It is considered that the temperature of the heating unit 32 shown in FIG. 7 changes according to the amount of scale attached. This is because the scale component is mainly calcium carbonate and silica,
This is because the thermal conductivity is extremely lower than that of metals such as stainless steel.

Therefore, in the present embodiment, when the temperature of the heating unit 32 becomes higher than a predetermined temperature by utilizing the phenomenon described above, the temperature detecting element 36 detects this and automatically determines that the scale is attached. The scale cleaning process is executed. That is, in the present embodiment, the temperature difference between the heating unit 32 and the cleaning tank 20 is
When it becomes 80 degrees or more, in other words, when it becomes 150 ° C. or more, the scale cleaning process described in the first or second embodiment is executed.

As described above, according to the dishwasher / dryer of this embodiment, the scale cleaning process is executed when the temperature of the heating unit 32 exceeds a predetermined temperature, so that the scale of the running water pipe 34 can be automatically cleaned as needed. Is something that can be done on a regular basis.

[0029]

As described above, the first means of the present invention is that the heating unit is provided outside the cleaning tank in association with the flowing pipe and the ventilation duct, and the temperature of the heating unit is set to the normal drying temperature during the drying process. By providing a higher scale cleaning process, it is possible to prevent problems such as melting of dishes and burns when taking out dishes, even if the heating unit is burnt in the drying process. It is possible to prevent the scale from adhering to the thermal efficiency and the thermal fuse from breaking.

In the second means of the present invention, in the scale cleaning step, by setting the temperature of the heating unit to a high temperature and operating the cleaning pump, heat shock due to the cleaning water is applied to the inside of the water flow pipe to further increase the scale. It is easy to drop.

Further, according to the third means of the present invention, when the scale adheres to the running water pipe of the heating unit to reduce the heat transfer coefficient between the running water pipe and the washing water, and the temperature of the heating unit rises during the washing process. The scale cleaning process is automatically executed, and the scale is automatically cleaned when necessary.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a dishwasher and dryer according to an embodiment of the first means of the present invention.

[Figure 2] Rear view of the dishwasher

FIG. 3 is a diagram showing a temperature control program of a heating unit of the dishwasher.

FIG. 4 is a diagram showing a temperature control program in an embodiment of the second means of the present invention.

FIG. 5 is a diagram showing a temperature control program in an embodiment of the third means of the present invention.

FIG. 6 is a vertical sectional view of a conventional dishwasher / dryer.

[Explanation of symbols]

 20 Cleaning Tank 22 Cleaning Pump 23 Cleaning Nozzle 25 Cleaning Water Circulation Channel 29 Tableware Basket 30 Ventilation Fan 31 Ventilation Duct 32 Heating Unit 33 Heating Element 34 Flowing Water Pipe 35 Radiator 36 Temperature Detection Element 37 Control Device

Claims (3)

[Claims] 1. A washing tank, a dish basket containing dishes placed in the washing tank, a washing pump for supplying washing water, and water supplied from the washing pump to supply water to the washing tank. A heating unit consisting of a cleaning nozzle, a cleaning water circulation channel for supplying cleaning water to the cleaning nozzle, a ventilation duct for communicating the inside of the cleaning tank with the outside air, a heating element, a flow pipe through which the cleaning water circulates, and a radiator provided in the ventilation duct. And a control device for controlling these, and a dishwasher / dryer provided with a scale cleaning step for setting the temperature of the heating unit higher than the normal drying temperature during the drying step. 2. A washing tank, a dish basket containing dishes placed in the washing tank, a washing pump for supplying water for washing, and a water supply from the washing pump to supply water to the washing tank. A heating unit consisting of a cleaning nozzle, a cleaning water circulation channel for supplying cleaning water to the cleaning nozzle, a ventilation duct for communicating the inside of the cleaning tank with the outside air, a heating element, a flow pipe through which the cleaning water circulates, and a radiator provided in the ventilation duct. And a control device for controlling these, and a dishwasher / dryer provided with a scale cleaning step for operating the washing pump after the heating unit is air-baked to a predetermined temperature during the washing process. 3. The dishwasher / dryer according to claim 1, wherein the scale cleaning step is performed when the heating unit exceeds a predetermined temperature during the cleaning step.