JP2875707B2 - dishwasher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher used for automatically washing dishes at home or the like, and more particularly to a dishwasher capable of drying dishes after washing in a bath.

[0002]

2. Description of the Related Art Tableware is stored in a washing tank, washing water is sprayed to wash the tableware, and then hot air heated by a heater is introduced into the washing tank, thereby automatically washing the washed tableware. Dishwashers that dry are already known, and
Practical.

[0003] As a drying method in such a conventional dishwasher, for example, as described in JP-A-2-124125, outside air is sucked into a heater portion by a blower fan, and the sucked outside air is heated by a heater to generate hot air. The hot air was blown onto the dishes arranged in the washing tank to dry the dishes. Then, the hot air containing moisture after being used for the drying treatment is discharged to the outside of the apparatus from an exhaust port provided at an upper portion of the cleaning tank.

[0004]

However, in the above-mentioned prior art, the hot air containing moisture after the dish drying process is exhausted from the exhaust port to the outside of the machine. Hot air containing high humidity is blown to the people in the area.

[0005] That is, in the conventional dishwasher, high-humidity and high-temperature steam is sprayed, which causes discomfort to the surrounding people. In addition, the dishwasher is incorporated in the system kitchen, and the position of the exhaust port ( When the height is just at the hand or face of the housewife or child, there is a problem that there is a risk of burns due to high-humidity and high-temperature steam from the exhaust port.

Further, dew adheres to parts near the exhaust port of the dishwasher when the hot air containing moisture from the exhaust port is cooled by the outside air, and water droplets flow down the front of the equipment. There was also a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and eliminates the need for exhausting high-humidity and high-temperature exhaust air after drying of the dishwasher of the dishwasher. Without causing discomfort to the person who is cooking in the kitchen, etc., where there is no danger of burns and without water droplets flowing out due to the condensation of exhaust air near the exhaust port of the dishwasher, An object of the present invention is to provide a dishwasher equipped with a novel dish drying mechanism excellent in safety and safety.

Further, another object of the present invention is to provide a heat exchanger which separates moisture by cooling high-humidity hot air after evaporating moisture on the dish surface, which is exhausted from a washing tank of a dishwasher. In the adopted new tableware drying method, a heat exchanger for cooling and dehumidifying, which is the most important constituent requirement, especially when installed in a dishwasher, a heat exchanger that exhibits its cooling and dehumidifying performance most efficiently It is to provide a specific configuration.

[0009]

SUMMARY OF THE INVENTION The present invention is directed to a washing tank for accommodating tableware therein, an injection means disposed in the washing tank for injecting washing water toward the contained tableware, and a washed tableware. Heater means for heating the air for drying, air blowing means for blowing the air heated by the heater means as hot air into the washing tank, and a part of an air circulation path for drying the dishes. A heat exchanger for cooling and dehumidifying wet hot air discharged from the washing tank during the dish drying step, and the heat exchanger includes a dishwasher outer frame and a cooling duct provided inside the outer frame. Provided between, the inner surface of the outer frame as the outer cooling surface, the outer surface of the cooling duct as the inner cooling surface, the outer cooling surface by natural convection heat transfer, the inner cooling surface by forced convection heat transfer, To cool down, and From a substantially substantially upper end of the vessel washing machine outside to the downstream the cooling surfaces discloses dishwasher to those formed.

That is, according to the dishwasher according to the present invention, the tableware contained in the washing tank is dried by blowing hot air heated by a heater on the surface of the tableware to evaporate water. . As a result, the moist hot air containing the evaporated water is discharged from the washing tank and led to the outer frame heat exchanger. In this outer frame heat exchanger, by cooling the high-humidity hot air discharged from the washing tank, the moisture of the hot air is condensed and adheres to the inner wall surface of the exchanger, and is separated and taken out as water. On the other hand, the air from which the moisture has been separated and dried is heated again by the heater and returned to the cleaning tank. Accordingly, the hot air containing much moisture that has been dried in the washing tank of the dishwasher is not discharged to the outside of the dishwasher, and the moisture attached to the dish surface is removed by the outer frame heat exchanger. Is separated and taken out. As described above, in the dishwasher of the present invention, dish drying is performed by repeating moisture evaporation from the dish surface due to contact between the dish and hot air in the washing tank and cooling and dehumidification in the outer frame heat exchanger. .

As a result, the hot air containing moisture, that is, the high-temperature steam, is not discharged from the exhaust port of the dishwasher to the outside of the machine, and the person in front of the dishwasher in the kitchen is blown with the high-temperature hot air to discomfort. Can be prevented, and there is no danger of burns. In addition, in the vicinity of the exhaust port of the dishwasher, dew formed by cooling the exhaust air with outside air does not adhere, and water drops do not flow out of the front surface of the dishwasher or the like.

Further, according to the dishwasher of the present invention,
As described above, the outer frame heat exchanger cools the outer surface of the outer frame of the dishwasher that is in contact with the outer air by natural convection heat transfer of the outer air, and the outer air cooling air flows along the inner cooling surface. Cool by forced convection heat transfer. As described above, by utilizing both the outer cooling surface and the inner cooling surface of the outer frame heat exchanger as cooling surfaces, the cooling and dehumidifying performance of the outer frame heat exchanger is greatly improved. In addition, the air dehumidified by the outer frame heat exchanger is guided to a fan and a fan casing that blow hot air to the cleaning tank, and after being heated again by the heater,
It is circulated and blown to the cleaning tank. As described above, by using both the outer cooling surface and the inner cooling surface in the outer frame heat exchanger as cooling surfaces, the cooling area is increased, and the performance of the outer frame heat exchanger is improved. Furthermore, a reduction in thickness can be achieved.

[0013]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view showing the entire configuration of a dishwasher according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an outer frame main body of a dishwasher, and a so-called washing tank 2 is provided inside the outer frame main body 1. In the washing tank 2, tableware baskets 3, 4 (upper and lower) are stored on shelf-like supports 201, 202 so as to be able to be pulled out to the outside by the function of casters attached to the lower surface. Various tableware 5 and 6 to be washed are stored in the tableware baskets 3 and 4 as illustrated.

A cleaning motor 7 is provided below the cleaning tank 2, and the cleaning motor 7 drives a cleaning pump 8. On the other hand, in the washing tank 2, an injection nozzle 9 is arranged below the lower tableware basket 4, and on the other hand, an injection nozzle 11 is also arranged below the upper tableware basket 5 in substantially the center of the washing tank 2. A plurality of injection ports 10 are formed on the upper surfaces of the injection nozzles 9 and 11, respectively. Further, a water supply tower 12 for sending the cleaning water from the cleaning pump 8 to the injection nozzles 9 and 11 is provided at a central portion in the cleaning tank 2.

Further, a washing water receiver 13 for storing washing water is formed below the washing tank 2. A washing water heater 14 for further heating the washing water is provided below a washing water receiver 13 formed at a lower portion of the washing tank 2, and a heater tank 15 arranged so as to surround the washing water heater 14. It is shown. Also, reference numeral 1 in the figure
Reference numeral 6 denotes a pump casing connected to the heater tank 15 and surrounding the cleaning pump 8.

On the other hand, a blow duct 17 for blowing hot air into the washing tank 2 is attached to a lower portion of the back (the right side in the figure) of the washing tank 2. Is equipped with an outer frame heat exchanger 18 having a vertical surface as a cooling surface. That is, the outer frame heat exchanger 18
Is composed of an outer cooling surface 19 of the outer frame and an inner cooling surface 20 of the outer frame. Further, reference numeral 21 in the figure denotes an exhaust duct for connecting the upper exhaust port of the washing tank 2 to the outer frame heat exchanger 18, and reference numeral 23 denotes a lower portion of the outer frame heat exchanger 18. And the symbol 2
Reference numeral 4 denotes a drain hose connected to the dehumidified water receiver 23 and the heater tank 15.

Further, inside the inner cooling surface 20 of the outer frame heat exchanger 18, cooling ducts 25 are further provided to face each other, and these inner cooling surfaces 20 and cooling ducts 25 are provided.
Has a structure through which outside air flows. That is, a cooling fan 26, a cooling fan casing 27 surrounding the cooling fan 26 are arranged below the washing tank 2, and an intake duct 28 and an intake port 29 for sucking outside air into the cooling fan 26 are provided. Have been. In order to connect the cooling fan casing 27 to the lower end of the cooling duct 25, a cooling air blowing duct 30 is attached. At the upper end of the cooling duct 25, an outlet 31 for cooling air passing between the inner cooling surface 20 of the outer frame heat exchanger and the cooling duct 25 is provided.
Are formed. Reference numeral 32 in the drawing denotes an opening / closing door provided on the front surface of the cleaning tank 2.

Next, FIG. 2 shows a washing tank 2 of the dishwasher.
FIG. 2 is a cross-sectional view illustrating a configuration of a blower fan and a heater unit that blows hot air to the heater, and is a cross-sectional view of a portion located in front of FIG. In FIG. 2, reference numerals 2 to 25 indicate the same components as those shown in FIG. 1. Specifically, reference numeral 2 denotes the washing tank, reference numeral 4 denotes a tableware basket, reference numeral 6 denotes tableware, and reference numeral 9 is an injection nozzle, 17 is a ventilation duct, 18 is
Denotes the outer frame heat exchanger, 19 denotes an outer cooling surface of the outer frame heat exchanger, 20 denotes an inner cooling surface of the outer frame heat exchanger, 22 denotes a circulation duct, and 23 denotes a dehumidified water receiving surface. To code 2
Reference numeral 4 denotes a drain hose, and reference numeral 25 denotes a cooling duct provided inside the inner cooling surface 20 of the outer frame heat exchanger.

Further, in FIG. 2, reference numeral 33 denotes a blower fan for blowing hot air to the cleaning tank 2, and the blower fan 33 is surrounded by a blower fan casing 34. The blower fan casing 34 is connected to a hot air connection duct 37 arranged on the right side of the figure by a heat duct 36, and a drying heater 35 is arranged in the heat duct 36. The hot air connection duct 37 is connected to the air blow duct 17 shown in FIG.

FIG. 3 is a sectional view showing the configuration of the motor drive unit of the cooling fan 26 shown in FIG. 1 and the blower fan 33 shown in FIG. 3, reference numeral 26 denotes a cooling fan, reference numeral 27 denotes a cooling fan casing, and reference numeral 28 denotes a cooling fan casing.
Indicates an outside air intake duct. On the other hand, reference numeral 33 denotes a hot air blowing fan, reference numeral 34 denotes a blowing fan casing, and reference numeral 22 denotes the circulation duct. And code 3
Reference numeral 8 denotes a fan motor for driving the cooling fan 26 and the hot-air blowing fan 33. Reference numerals 39 and 40 denote rotating shafts protruding from both ends of the fan motor 38. Reference numeral 41 in the figure denotes a bottom plate surface of the outer frame body 1 and reference numeral 42 denotes
Reference numerals 43 designate mounting brackets for installing the fan motor 38 on the bottom plate surface 41. That is, in this embodiment, the rotation axis of one fan motor 38 (indicated by reference numerals 39 and 40)
A cooling fan 26 and a blowing fan 33 are attached to both ends of
At the same time, it is structured to rotate.

Next, the operation of the dishwasher according to the embodiment of the present invention whose structure has been described above will be described. The dishwasher of the present embodiment automatically performs washing, rinsing, and drying of the dish.

First, in washing the dishes, the dishes 5, 6 are prepared in advance.
Are arranged side by side in the tableware baskets 3 and 4. Specifically, the opening / closing door 32 is tilted forward and opened, and the tableware baskets 3 and 4 are opened.
From the washing tank 2 to the outside. In this state, the tablewares 5 and 6 to be washed are appropriately arranged in the tableware baskets 3 and 4 from which the tablewares 5 and 6 have been drawn out, and then pushed again into a predetermined position in the washing tank 2 by the action of a caster. close. Subsequently, washing water is poured into the heater tank 15, and at the same time, dishwashing detergent is supplied. And the heater 1 in the tank
4 to heat the washing water stored in the heater tank 15. Thereafter, the cleaning pump 8 is driven by the cleaning motor 7 to apply pressure to the cleaning water in the heater tank 15 to supply water to the spray nozzles 9 and 11. As a result, the hot and high-pressure washing water is supplied to the spray nozzle 9 and the spray nozzle 11.
And is sprayed on the surfaces of the dishes 5 and 6 to wash the dishes.

Next, the rinsing operation is such that the washing water used in the washing operation is drained from the drain hose 24 and then again.
Rinse water into the heater tank 15 and wash water 1
4. Heat the rinse water to warm water. Then, the heated hot water is sprayed from the spray nozzle 9 and the spray nozzle 11 onto the surfaces of the dishes 5 and 6 by the cleaning pump 8. After the rinsing operation, the dishwasher drains the rinsing water to the outside from the drain hose 24, and then performs a drying operation.

The drying operation of the dish after the washing will be described. First, energization of the drying heater 35 shown in FIG.
This is performed by rotating the blower fan 33 by driving the fan motor 38 in FIG. That is, in FIG. 2, when the blower fan 33 is rotated, the air is blown from the fan casing 34 to the heater duct 36, and is heated by the drying heater 35 to become high-temperature hot air. This hot air passes from the heater duct 36 through the connection duct 37 and the air duct 17,
The air is blown into the cleaning tank 2.

The hot air flows from the lower part to the upper part in the washing tank 2 as shown by the broken arrows in FIG. 1, and at this time, the hot air comes into contact with the surfaces of the dishes 5 and 6 arranged in the washing tank 2. , To evaporate the water on the tableware surface. The moist hot air that has absorbed the evaporated water flows from the exhaust port at the top of the cleaning tank 2 to the exhaust duct 2.
1 and is sent to the outer frame heat exchanger 18. Then, the wet hot air is cooled by the natural convection heat transfer of the outside air on the outer cooling surface 19 of the outer frame heat exchanger 18, thereby being dehumidified, and thereby the dehumidified water droplet a is formed on the inner surface of the outer cooling surface 19. Occurs. Further, the moist hot air is also cooled by the forced convection heat transfer by the outside air cooling air sucked by the cooling fan 26 on the inner cooling surface 20 of the outer frame heat exchanger 18,
As a result, dehumidified water droplets b are generated on the inner surface of the inner cooling surface 20. That is, the hot air that has absorbed the moisture of the tableware evaporated in the washing tank 2 is dehumidified and dried by the cooling effect of the outer frame heat exchanger 18.

Here, a method of sucking and discharging outside air cooling air by the cooling fan 26 will be described. In FIG.
When the cooling fan 26 is rotated by the fan motor 38 (see FIG. 3), the outside air below the bottom plate surface 41 of the dishwasher is drawn into the suction duct 28 from the suction port 29 and is blown to the cooling fan casing 27. You. The outside air cooling air that has exited the cooling fan casing 27 passes through the ventilation duct 30 and the inside cooling surface 20 of the outer frame heat exchanger 18 and the cooling duct 2.
5 is blown to the air path. As described above, this outside air cooling air cools and dehumidifies the wet exhaust hot air in the outer frame heat exchanger 18 at the inner cooling surface 20. Thereafter, the outside air cooling air flows upward along the inner cooling surface 20 as shown by the solid arrow, and is discharged out of the machine through the discharge port 31.

As described above, dehumidified water droplets a adhere to the inner surface of the outer cooling surface 19 of the outer frame heat exchanger 18, and dehumidified water droplets b adhere to the inner surface of the inner cooling surface 20 of the outer frame heat exchanger 18. Adheres. The dehumidified water droplets flow down along the vertical surfaces of the outer cooling surface 19 and the inner cooling surface 20 as the water droplets become larger, and the dehumidified water collects in the dehumidified water receiver 23 and is drained from the drain hose 24 to the outside of the machine. . On the other hand, the air in the washing tank 2 which has been cooled and dehumidified by the outer frame heat exchanger 18 passes through the circulation duct 22 and is again circulated to the blower fan 33 and the fan casing 34 as shown in FIG.
After the heating, the air is sent to the washing tank 2 and is again used as hot air for drying the dishes.

As described above, according to the first embodiment of the present invention described above, the drying of the dishes after washing and rinsing is performed by the contact between the dishes 5 and 6 and the hot air in the washing tank 2 from the dish surface. High-humidity hot air containing evaporated water is dehumidified by the outer frame heat exchanger 18 and discharged as water droplets. That is, natural convection cooling by the outside air on the outer cooling surface 19 of the outer frame heat exchanger 18 and the outer frame heat exchanger 1
By the forced convection cooling of the outside air cooling air by the cooling fan 26 on the inner cooling surface 20 of 8, cooling and dehumidification of high humidity hot air is performed, and the hot air after dehumidification is again sent into the washing tank 2 and used for dish drying. Then, high-humidity hot air is generated, and the tableware is dried by repeating this.

This means that the water adhering to the dishes in the washing tank 2 at the time of washing is treated by the outer frame heat exchanger 18 as water droplets in the dishwasher, and therefore, the moisture from the dishwasher is contained. Hot air is not discharged outside the machine. In this dishwasher, the cooling air outlet 3
Cooling air warmed through the outer frame heat exchanger 18 is discharged from 1, but this discharged air is cut off from the air used for drying the dishes in the washing tank 2 and adheres to the surface of the dishes. It does not contain any moisture vapors. Therefore, it is possible to prevent a person in front of the dishwasher in the kitchen from blowing hot humid air to give a feeling of discomfort, and to eliminate the danger of burns and the like. In addition, in the vicinity of the exhaust port of the dishwasher, the high-humidity exhaust air is cooled by the outside air to form dew, and the water droplets are prevented from flowing out.

Further, according to the first embodiment of the present invention, cooling by natural convection of the outside air using the outer cooling surface 19 of the outer frame heat exchanger 18 and cooling of the inner side of the outer frame heat exchanger 18 are performed. By cooling by forced convection of the outside air cooling air by the cooling fan 26 on the surface 20, cooling is performed while efficiently utilizing both the front and back cooling surfaces of the outer frame heat exchanger 18. Therefore, by utilizing the cooling area of the outer frame heat exchanger 18 twice, the cooling and dehumidifying performance of the outer frame heat exchanger 18 can be improved, and accordingly, the tableware can be dried quickly in the washing tank 2. Can be.

FIG. 4 is a side sectional view of a dishwasher according to a second embodiment of the present invention. In the second embodiment, the rear side 45 of the washing tank 2 of the dishwasher is used for cooling and dehumidification. This is used as a cooling duct for the outer frame heat exchanger 18 (see reference numeral 25 in FIG. 1). In FIG.
1 shows the same components as those in FIG. 1. Specifically, reference numeral 2 denotes the cleaning tank, reference numeral 18 denotes the outer frame heat exchanger, and reference numeral 19 denotes the outer cooling surface of the outer frame heat exchanger 18. Reference numeral 20 denotes the inside cooling surface of the outer frame heat exchanger 18, reference numeral 21 denotes the exhaust duct, reference numeral 22 denotes the circulation duct, reference numeral 24 denotes the drain hose, reference numeral 26 denotes the cooling fan, and reference numeral 27 denotes the cooling. Reference numeral 28 denotes an outside air intake duct, reference numeral 29 denotes an intake port of the outside air intake duct 28, reference numeral 30 denotes a cooling air blowing duct, and reference numeral 31 denotes a cooling air outlet.

In the second embodiment, the cleaning tank 2
As can be seen from the figure, the inner side surface 45 of the inner frame 45 is disposed so as to approach and face the inner cooling surface 20 of the outer frame heat exchanger 18 to form an inner cooling duct, and a space formed therebetween. , The outside air cooling air introduced by the cooling fan 26 is blown. Reference numeral 46 in the figure denotes a cooling duct installed for connecting the cooling air blowing duct 30 and the inside cooling duct 45, and reference numeral 47 denotes a cooling air passing through the inside cooling duct 45 to the outside of the machine. A cooling air discharge duct for discharging the cooling air to the cooling air discharge duct 47 is provided.

The operation of the second embodiment whose configuration has been described above will be described below. The operations in the washing and rinsing steps of the dishes are the same as those in the embodiment of FIGS.
The description of the operation is omitted. Then, when the washing and rinsing of the dishes is completed and the drying process starts, the heater for drying (see reference numeral 35 in FIG. 2) is energized and the fan motor (see reference numeral 38 in FIG. 3) is driven at the same time. By driving the fan motor, the blower fan (see reference numeral 33 in FIG. 2) and the cooling fan 26 rotate together.

The air blown by the blower fan is heated by a drying heater (see reference numeral 35 in FIG. 2) to become high-temperature hot air, which is blown into the cleaning tank 2 according to the first embodiment. Is the same as The hot air evaporates and adheres to the surface of the tableware while being in contact with the tableware 5 and 6 arranged in the washing tank 2, and is dried. The hot air moistened by absorbing the evaporated water flows into the outer frame heat exchanger 18 from the upper exhaust port of the cleaning tank 2 through the exhaust duct 21, and is cooled by the outer cooling surface 19 of the outer frame heat exchanger 18. It flows in the space between the inner cooling surfaces 20. The flow of the hot air is indicated by hollow arrows in the drawing.

On the other hand, the outside air as the cooling air is indicated by solid arrows in FIG. First, the bottom plate 4 of the dishwasher
The outside air below 1 is sucked into the machine from the intake port 29 and the intake duct 28 by the operation of the cooling fan 26, and flows into the cooling fan casing 27. Further, the cooling air passes through the cooling air blowing duct 30 and passes through a cooling air passage formed between the inner cooling duct 45 on the inner side of the washing tank 2 and the inner cooling surface 20 of the outer frame heat exchanger 18. Inflow. At this time, the outside air cooling air is cooled while contacting the inside cooling surface 20 of the outer frame heat exchanger 18. As a result, the moist hot air from the washing tank 2 flowing through the space formed between the outer cooling surface 19 and the inner cooling surface 20 of the outer frame heat exchanger 18 is cooled, so that the high-humidity hot air is cooled inside. Cooling and dehumidification are performed on the surface 20. Then, the outside air cooling air that has passed through the outer frame heat exchanger 18 is discharged to the outside from the cooling air discharge port 31 through the discharge duct 47. At the same time, cooling is performed on the outer cooling surface 19 of the outer frame heat exchanger 18 by natural convection heat transfer of the outside air at the back of the dishwasher, whereby the moist hot air from the washing tank 2 is cooled. The dehumidification is the same as in the first embodiment. Thereafter, the air cooled and dehumidified by the outer frame heat exchanger 18 is supplied to the circulation duct 2.
It is needless to say that the air is returned to the blower fan (see reference numeral 33 in FIG. 2) again after passing through the cleaning tank 2 and heated, and then sent to the washing tank 2 as hot air for drying.

As described in detail above, according to the second embodiment of the present invention, the inner cooling duct 45 constituted by the inner side surface of the cleaning tank 2 is used as the inner cooling duct surface of the outer frame heat exchanger 18. Since the cleaning tank 2 is used, the cleaning tank 2 is fixed to the outer frame body 1. Furthermore, the rigidity of the wall surface of the cleaning tank 2 eliminates the need for a component for attaching the inner cooling duct 45 to the outer frame, so that a protrusion is not formed in the flow path by the attaching component, and the inner cooling duct 45 is not formed. 4
It is possible to make the flow of outside air cooling air passing between the inner cooling surface 5 and the inner cooling surface 20 uniform, and to improve the cooling performance of the outer frame heat exchanger 18. Therefore, the dehumidifying performance of the outer frame heat exchanger 18 is improved, and the drying time of the tableware can be reduced.

In the second embodiment, since the rear side surface 45 of the cleaning tank 2 is shared as a cooling duct for the outer frame heat exchanger 18, the rear side surface of the cleaning tank 2 is , It is possible to increase the volume of the washing tub 2 in a dishwasher of the same size, increase the amount of tableware to be stored and washed in the washing tub 2, and wash more dishes at once. it can. Alternatively, in the case of the washing tank 2 having the same dimensions, the outer dimensions of the dishwasher can be made thinner and smaller. Further, since the rear side surface 45 of the cleaning tank 2 is commonly used as a cooling duct for the outer frame heat exchanger 18, it is possible to significantly reduce the cost of a heat exchanger component for cooling and dehumidifying. .

FIG. 5 shows a side sectional view of a dishwasher according to a third embodiment of the present invention. In FIG. 5, reference numerals 2 to 45 correspond to the components shown in FIG. 4, that is, reference numeral 1 denotes an outer frame body of the dishwasher,
Reference numeral 2 denotes the washing tank, reference numeral 4 denotes a table basket, reference numeral 6 denotes tableware, reference numeral 18 denotes an outer frame heat exchanger, reference numeral 19 denotes an outer cooling surface of the outer frame heat exchanger, and reference numeral 20 denotes an outer frame. Reference numeral 21 denotes an exhaust duct from the cleaning tank 2, reference numeral 22 denotes a circulation duct, reference numeral 26 denotes a cooling fan, reference numeral 27 denotes a cooling fan casing, and reference numeral 28 denotes an outside air intake duct. Reference numeral 30 indicates a cooling air blow duct.

In the third embodiment, FIG.
As in the second embodiment shown in FIG.
Is used as an inner cooling duct in the vicinity of and opposed to the outer cooling surface 19 of the outer frame heat exchanger 18. Further, the inner side cooling surface 20 of the rear side surface 45 faces the inner cooling surface 20 of the outer frame heat exchanger 18. The cleaning tank heat insulating material 48 is provided on the entire mating surface.

The operation of the drying process according to the third embodiment of the present invention will be described below. First, in the same manner as in the embodiment shown in FIGS. 1 and 2, the washing and rinsing steps of the dishes are completed, and the drying step is performed in the same manner as in the above-described embodiment. When the dishwasher enters the drying process, the drying heater 35 is energized to drive the fan motor 38 shown in FIG. 3 to rotate the blower fan 33 and the cooling fan 26. The air blown by the blower fan 33 is heated by a drying heater (see reference numeral 35 in FIG. 2) to become high-temperature hot air, which is blown into the cleaning tank 2, and the hot air is arranged in the cleaning tank 2. The dishes are dried by contacting with the dishes 5 and 6 to evaporate water. Thereafter, the moist hot air that has absorbed the evaporated water flows into the outer frame heat exchanger 18 from the upper exhaust port of the cleaning tank 2 through the exhaust duct 21, and flows into the outer cooling surface 19 of the outer frame heat exchanger 18. It flows in the space between the inner cooling surfaces 20.

On the other hand, the external cooling air sucked by the cooling fan 26 from the intake port 29 opened on the bottom plate surface 41 of the dishwasher flows into the cooling fan casing 27 through the intake duct 28. After that, the outside air cooling air further passes through the cooling air blowing duct 30, and the cooling air formed between the inner cooling duct 45, which is the back side of the washing tank 2, and the inner cooling surface 20 of the outer frame heat exchanger 18. It flows upward in the wind path. The outside air cooling air is cooled while contacting the inside cooling surface 20 of the outer frame heat exchanger 18, thereby cooling the moist hot air from the cleaning tank 2. That is,
The high-humidity hot air after the dishes are dried is cooled and dehumidified by the inner cooling surface 20 of the outer frame heat exchanger 18.

According to the structure of the dishwasher according to the third embodiment, the surface of the washing tub 2 facing the inner cooling surface 20 of the inner cooling duct 45, which is the inner side surface of the washing tub 2, is provided with the washing tub insulating material. 48 are provided. Therefore, heat from the cleaning tank 2 is passed through the inner cooling duct 45 to the inner cooling surface 2.
0 is prevented from being transmitted to the external cooling air flowing in the cooling air passage formed between the cooling air passages. Thereafter, the outside air cooling wind passes through the exhaust duct 47 and is discharged outside the machine from the cooling air outlet 31. At the same time, it goes without saying that the high-humidity hot air from the washing tank 2 is cooled and dehumidified on the outer cooling surface 19 of the outer frame heat exchanger 18 by natural convection of the outside air on the back surface of the dishwasher. After that, the outer frame heat exchanger 18
The air thus cooled and dehumidified passes through the circulation duct 22 and is returned to the blower fan (see reference numeral 33 in FIG. 2), and after being heated, is blown into the cleaning tank 2 as hot air for drying.

As described above, according to the third embodiment of the present invention, the cleaning tank heat insulating material is provided on the surface of the inner cooling duct 45 formed on the back side of the cleaning tank 2 facing the inner cooling surface 20. 48, heat in the cleaning tank 2 is sucked by the cooling fan 26 to cool the inner cooling surface 20 of the outer frame heat exchanger 18, and the inner cooling surface 20 of the outer frame heat exchanger 18 It is prevented from being transmitted to the outside air flowing through the passage between the cooling duct 45 and the cooling duct 45. Therefore, according to the third embodiment, since the cooling performance on the inner cooling surface 20 of the outer frame heat exchanger 18 can be further improved, the cooling and dehumidifying performance on the outer frame heat exchanger 18 can be further improved. And then
The drying time of the dishes can be further reduced.

[0044]

As is apparent from the above detailed description of the embodiment of the present invention, according to the dishwasher of the present invention, during the drying process of the dish, water on the surface of the dish is evaporated in the washing tank, The high-humidity hot air absorbing this is introduced into the outer frame heat exchanger, cooled to separate the water as water droplets, heated again, and sent into the cleaning tank. By repeating this, the dishes are washed and the dishes are dried after the rinsing process. Therefore, the hot humid air in the cleaning tank is not discharged to the outside of the machine, but is taken out as water droplets by the outer frame heat exchanger, and the hot air containing much moisture in the cleaning tank is discharged to the outside of the machine. It is possible to prevent a person near the dishwasher from feeling uncomfortable, and to eliminate the danger of burns or the like caused by blowing high-humidity and high-temperature hot air onto human skin.

Further, according to the dishwasher of the present invention, the outside air discharged from the washing machine is not the high-humidity high-temperature hot air in the washing tank but the outside air cooling air heated by the outer frame heat exchanger 18. Therefore, its humidity has not been increased, and
No condensation occurs even when the exhaust is blown near the exhaust port of the dishwasher and cooled. This eliminates the problem that, as in a conventional dishwasher, high-humidity and high-temperature hot air discharged from the exhaust port adheres to the surrounding surface and forms dew, which flows out of the dishwasher surface, for example. .

Further, in the dishwasher according to the present invention described above, the structure of the outer frame heat exchanger for cooling and dehumidifying the high-humidity and high-temperature hot air from the washing tank is different from that of the outer frame heat exchanger. The outer cooling surface is cooled by natural convection heat transfer of outside air, and the inner cooling surface is cooled by forced convection heat of outside air cooling air drawn in by a cooling fan. The cooling area of the frame heat exchanger can be doubled, so that the cooling and dehumidifying performance of the outer frame heat exchanger can be improved and the drying time of the tableware can be reduced.

In addition, according to the present invention, the cooling duct is attached to the outer frame main body by using the inner side surface of the washing tank as a cooling duct for the outside air cooling air for cooling the inner cooling surface of the outer frame heat exchanger. Since parts are not required, the flow of the outside air cooling air can be made uniform, so that the cooling performance on the inner cooling surface of the outer frame heat exchanger is improved, and thus the dehumidifying performance of the outer frame heat exchanger is improved. , Can shorten the drying time of the dishes.
Also, by using the back side of the washing tank as a cooling duct for the outer frame heat exchanger, the back side of the washing tank can be close to the back of the outer frame of the outer frame body. Can be increased in volume, whereby the amount of tableware put in the washing tank can be increased, and many dishes can be washed at once. Furthermore, since the back side of the washing tank is shared as the cooling duct of the outer frame heat exchanger,
The cost of the heat exchanger component can be reduced.

Further, according to the dishwasher according to the present invention, the heat in the washing tank is reduced by cooling the inside of the outer frame heat exchanger by providing the washing tank heat insulator in the inner cooling duct formed on the inner side of the washing tank. Since the heat is prevented from being transmitted to the outside air cooled by the cooling fan to cool the surface, the cooling performance on the inner cooling surface of the outer frame heat exchanger can be improved. For this reason, it is possible to further improve the cooling and dehumidifying performance of the outer frame heat exchanger and to further reduce the drying time of the tableware.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an entire configuration of a dishwasher according to a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a detailed configuration of a blowing fan and a drying heater of the dishwasher according to the first embodiment.

FIG. 3 is a partial side sectional view showing a fan drive unit of the dishwasher according to the first embodiment.

FIG. 4 is a side sectional view showing an internal configuration of a dishwasher according to a second embodiment of the present invention.

FIG. 5 is a side sectional view showing an internal configuration of a dishwasher according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer frame main body 2 Cleaning tank 3, 4 Tableware basket 5, 6 Tableware 7 Cleaning motor 8 Cleaning pump 9, 11 Injection nozzle 10 Injection port 12 Water supply tower 13 Cleaning water receiving 14 Cleaning water heater 15 Heater dunk 16 Pump casing 17 Air duct 18 Outer frame heat exchanger 19 Outer cooling surface 20 Inner cooling surface 21 Exhaust duct 22 Circulation duct 23 Dehumidified water receiver 24 Drain hose 25 Cooling duct plate 26 Cooling fan 27 Cooling fan casing 28 Outside air intake duct 29 Intake port 30 Cooling air blow Duct 31 Cooling air outlet 32 Opening / closing door 33 Hot air blowing fan 34 Fan casing 35 Drying heater 36 Heater duct 37 Hot air connection duct 38 Fan motor 39, 40 Rotating shaft 41 Bottom plate surface of outer frame 45 Inside cooling duct 46 Cooling air duct 47 Cooling Wind exhaust duct 48 Cleaning Insulating material

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-187138 (JP, A) JP-A-50-109554 (JP, A) JP-A-5-42094 (JP, A) 60457 (JP, U) Hikaru 2-119154 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47L 15/42

Claims (1)

(57) [Claims] 1. A washing tank for accommodating tableware therein, an injection means disposed in the washing tank for injecting washing water toward the accommodated tableware, and a heater for heating air for drying the washed tableware. Means, air blowing means for blowing air heated by the heater means as hot air into the washing tank, and a part of an air circulation path for drying the dishes, the washing in the dish drying step. A heat exchanger for cooling and dehumidifying wet hot air discharged from the tank, wherein the heat exchanger is provided between a dishwasher outer frame and a cooling duct provided inside the outer frame. The outer surface of the cooling duct is the inner cooling surface, the outer cooling surface is by natural convection heat transfer, and the inner cooling surface is by forced convection heat transfer.
A dishwasher which is adapted to cool, and wherein the cooling surface is formed substantially from the upper end to the downstream of the dishwasher.