JPH06277171A - Dishwasher - Google Patents

Abstract

PURPOSE:To avoid exhausting of hot air contg. moisture to the outside of the machine by returning dried air prepd. by cooling and demoisturing by means of an outer frame heat exchanger into a washing tank after heating it. CONSTITUTION:A moistend hot air having absorbed water evaporated from the surface of dishes is cooled and demoistened on the outerside cooling face 19 of an outer frame heat exchanger 18 from an exhaust exit of the upper part of a washing tank 2 through an exhaust duct 21 by natural and convection heat transmission of the outer air. In addition, it is cooled and demoistured by the forcible convection heat transmission with the outer cooling wind sucked from a cooling fan 26 on the inner cooling face 20. The air in the washing tank 2 cooled and demoistened in the outer frame heat exchanger 18 is circulated again into an air feeding fan and a fan casing through a circulation duct 22 and after it is heated, it is returned to the washing tank 2. The heated cooled air is exhausted from an air exhausting hole 31 through the outer frame heat exchanger 18 but this exhausted air is shielded out of the air used for drying of dishes in the washing tank 2. It is therefore possible to prevent a person standing at front of a dish washer in the kitchen from feeling unpleasant by blowing a hot air with high humidity and to avoid danger of burn.

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 and the like, and more particularly to a dishwasher capable of drying washed dishes in a tank.

[0002]

2. Description of the Related Art Tableware is housed in a washing tank, the washing water is sprayed to wash the dishes, and then hot air heated by a heater is introduced into the washing tank to automatically wash the dishes. Drying dishwashers are already known, and
It is in practical use. The drying method in such a conventional dishwasher, for example, as described in JP-A-2-124125, sucks outside air into the heater section by a blower fan,
The inhaled outside air is heated by a heater to form hot air, and the hot air is blown to the dishes arranged in the washing tank to dry the dishes. The hot air containing moisture after being used in this drying process is discharged to the outside of the machine through an exhaust port provided in the upper part of the cleaning tank.

[0003]

However, in the above-mentioned prior art, since hot air containing moisture after the tableware drying process is exhausted from the exhaust port to the outside of the machine, the vicinity of the exhaust port of the dishwasher is solved. Hot air containing high humidity is blown to people in the area. In other words, in the conventional dishwasher, the steam of high humidity and high temperature is sprayed, which causes a discomfort to the surrounding people. Moreover, the dishwasher is installed in the system kitchen, and the position (height) of the exhaust port is high. When there is a housewife or a child in the position of hands or face, there is a problem that there is a risk of burns due to high humidity and high temperature steam from the exhaust port. In addition, there is a problem that dew adheres to the 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 the water drops flow down the front of the device. there were.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and eliminates exhaustion of high humidity and high temperature after drying the dishes of the dishwasher to the outside of the dishwasher. There is no risk of burns and no outflow of water droplets due to condensation of exhaust gas near the exhaust port of the dishwasher, that is, the environment An object of the present invention is to provide a dishwasher equipped with a new dish drying mechanism which is excellent in safety and safety.

Further, another object of the present invention is to provide a heat exchanger which cools high-humidity hot air exhausted from the washing tub of a dishwasher and evaporates water on the surface of the dish to separate the water. In the adopted new tableware drying method, the heat exchanger for cooling and dehumidifying, which is the most important component, is installed in the dishwasher, and the heat exchanger that maximizes its cooling and dehumidifying performance. It is to provide a concrete configuration.

[0006]

In order to achieve the above object, the dishwasher proposed by the present invention comprises an outer frame heat exchanger provided on the back surface of the outer frame body of the dishwasher.
Further, this outer frame heat exchanger is configured such that its outer cooling surface is cooled by natural convection heat transfer of outside air, and its inner cooling surface is cooled by forced convection heat transfer of outside air cooling air sucked by a cooling fan. By adopting the above, that is, by making both surfaces cooling surfaces, the cooling area is doubled and heat exchange is possible with high efficiency. Then, hot air containing a large amount of moisture is introduced into the outer frame heat exchanger by drying the tableware in the washing tank, and the high-humidity hot air is cooled by the outer frame heat exchanger to separate water and dehumidify. . The air cooled and dehumidified by the outer frame heat exchanger is heated by the heater, and then is blown into the washing tank containing the dishes again to evaporate and dry the water adhering to the surface of the dishes, and this is repeated. To dry the dishes.

Further, in the dishwasher proposed by the present invention, a structure is proposed in which the back side surface of the washing tank is brought close to the inner cooling surface of the outer frame heat exchanger and is used as a cooling duct. . A cooling fan for blowing the outside air cooling air is provided in the cooling air passage formed between the cooling duct and the inner cooling surface of the outer frame heat exchanger.

Further, in the dishwasher proposed by the present invention, the wall surface of the washing tank and the cooling air passage of the outer frame heat exchanger are thermally isolated from each other on the cooling air passage side on the inner side surface of the washing tank. Insulation is provided.

[0009]

That is, according to the dishwasher of the present invention, the dishes stored in the washing tank are dried by blowing hot air heated by the heater onto the surface of the dishes to evaporate the water content. . The moist hot air containing the water thus evaporated is discharged from the cleaning tank and guided to the outer frame heat exchanger. In this outer frame heat exchanger, by cooling the high-humidity hot air discharged from the cleaning tank, the moisture of the hot air is condensed and adheres to the inner wall surface of the exchanger to be separated and taken out as water. On the other hand, the air from which water has been separated and dried is heated again by the heater and returned to the cleaning tank. As a result, the hot air containing a large amount of moisture that has dried the dishes in the washing tub of the dishwasher is not discharged to the outside of the dishwasher, and the moisture adhering to the surface of the dishwasher is removed by the outer frame heat exchanger. Is separated and taken out. Thus, in the dishwasher of the present invention, tableware drying is performed by repeating evaporation of water from the surface of the tableware by contact between the tableware and hot air in the washing tank and cooling and dehumidification in the outer frame heat exchanger. .

As a result, hot air containing moisture, that is, hot steam, is not discharged from the exhaust port of the dishwasher to the outside of the dishwasher, and hot air is blown to a person in front of the dishwasher in the kitchen to feel uncomfortable. Can be prevented, and the risk of burns is eliminated. Further, in the vicinity of the exhaust port of the dishwasher, the exhaust gas is cooled by the outside air so that dew is not attached and water drops do not flow out on the front surface of the dishwasher or the like.

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 cools the outer air cooling air 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 significantly improved. The air dehumidified by the outer frame heat exchanger is guided to the fan and the fan casing that blow hot air into the cleaning tank, and after being heated by the heater again,
Circulation is sent to the cleaning tank. In this way, by increasing the cooling area by utilizing both the outer cooling surface and the inner cooling surface of the outer frame heat exchanger as cooling surfaces,

Further, in the dishwasher according to the present invention, the back side of the washing tank is brought close to the inner cooling surface of the outer frame heat exchanger, this space is used as a cooling air passage, and the cooling air passage has a cooling fan. Has proposed a configuration in which outside air cooling air is blown. According to this configuration, since the back side of the cleaning tank is used as the cooling air duct of the outer frame heat exchanger, there is no need for a component to attach the cooling air duct to the outer frame body, and the flow of the outside air cooling air is eliminated. Therefore, the cooling and dehumidifying performance of the outer frame heat exchanger can be improved. Further, since the back side of the cleaning tank is also used as the cooling air duct of the heat exchanger, the cost of the heat exchanger can be reduced. In addition, a cooling fan is provided by providing a heat insulating material on the cooling air passage side of the outer frame heat exchanger on the back side of the cleaning tank to thermally isolate the cleaning tank and the cooling air passage of the outer frame heat exchanger. When the outside air cooling air is blown with, the heat insulating material provided on the back side of the cleaning tank prevents the heat in the cleaning tank from being transferred to the outside air cooling air, so improve the cooling performance of the outer frame heat exchanger. You can Therefore,
The cooling performance of the outer frame heat exchanger can be improved, and the dishes can be dried in a short time.

[0013]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view showing the overall configuration of a dishwasher according to the first embodiment of the present invention. In FIG. 1, reference numeral 1 indicates an outer frame body of the dishwasher, and inside the outer frame body 1, a so-called washing tank 2 is provided. In the cleaning tank 2, tableware baskets 3 and 4 (upper and lower stages) are housed on shelf-like supports 201 and 202 so as to be pulled out to the outside by the action of casters attached to the lower surface. Then, in the dish baskets 3 and 4, various dishes 5 and 6 to be washed are stored as shown in the drawing.

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 cleaning tank 2, an injection nozzle 9 is arranged below the lower dish basket 4, and on the other hand, an injection nozzle 11 is arranged below the upper dish basket 5 in the approximate center of the cleaning bath 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 the center of the cleaning tank 2.

Further, a wash water receiver 13 for storing wash water is formed in the lower part of the wash tank 2. Below the wash water receiver 13 formed in the lower portion of the wash tank 2, a wash water heater 14 for heating the wash water is further provided, and a heater tank 15 arranged so as to surround the wash water heater 14. It is shown. Reference numeral 1 in the figure
Reference numeral 6 is a pump casing that is connected to the heater tank 15 and surrounds the cleaning pump 8.

On the other hand, a ventilation duct 17 for blowing hot air into the cleaning tank 2 is attached to the lower part of the rear surface (right side in the drawing) of the cleaning tank 2, and further on the rear surface of the outer frame body 1. Is attached with an outer frame heat exchanger 18 whose vertical surface is a cooling surface. That is, this 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 drawing is an exhaust duct for connecting the upper exhaust port of the cleaning tank 2 to the outer frame heat exchanger 18, and reference numeral 23 is provided in a lower portion of the outer frame heat exchanger 18. Dehumidified water receiver, and code 2
Reference numeral 4 denotes a drainage hose connected to the dehumidifying water receiver 23 and the heater tank 15.

A cooling duct 25 is further provided inside the inner cooling surface 20 of the outer frame heat exchanger 18 so as to face each other, and the inner cooling surface 20 and the cooling duct 25 are provided.
The space formed between and has a structure in which outside air flows. That is, a cooling fan 26 and a cooling fan casing 27 that surrounds the cooling fan 26 are arranged in the lower portion of the cleaning tank 2, and an intake duct 28 and an intake port 29 for sucking outside air into the cooling fan 26 are provided. Has been. Further, 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, a cooling air discharge port 31 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 the washing tank 2 of the dishwasher.
It is sectional drawing which shows the structure of the ventilation fan which blows | emits a hot air to, and a heater part, and is a sectional view in the location located in front of FIG. In FIG. 2, reference numerals 2 to 25 indicate the same constituent elements as those shown in FIG. 1, and specifically, reference numeral 2 indicates the cleaning tank, reference numeral 4 indicates a dish basket, reference numeral 6 indicates dish, Reference numeral 9 is an injection nozzle, reference numeral 17 is a ventilation duct, reference numeral 18
Is the outer frame heat exchanger, 19 is the outer cooling surface of the outer frame heat exchanger, 20 is the inner cooling surface of the outer frame heat exchanger, 22 is the circulation duct, and 23 is the dehumidified water receiver. Is 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 is 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 by a heat duct 36 to a hot air connecting duct 37 arranged on the right side of the drawing, and a drying heater 35 is arranged in the heat duct 36. The hot air connecting duct 37 is connected to the air blowing duct 17 shown in FIG.

FIG. 3 is a cross-sectional view showing the structure of the motor drive portion of the cooling fan 26 shown in FIG. 1 and the blower fan 33 shown in FIG. In FIG. 3, reference numeral 26 is a cooling fan, reference numeral 27 is a cooling fan casing, and reference numeral 28.
Shows the outside air intake duct. On the other hand, reference numeral 33 is a hot air blower fan, reference numeral 34 is a blower fan casing, and reference numeral 22 is the circulation duct. And reference numeral 3
Reference numeral 8 denotes a fan motor for driving the cooling fan 26 and the hot air blowing fan 33, and reference numerals 39 and 40 denote rotating shafts protruding from both ends of the fan motor 38. Further, reference numeral 41 in the drawing denotes the bottom plate surface of the outer frame body 1, and reference numeral 42
Reference numerals 43 and 43 denote mounting members for mounting the fan motor 38 on the bottom plate surface 41. That is, in this embodiment, the rotation shaft of one fan motor 38 (indicated by reference numerals 39 and 40).
Attach the cooling fan 26 and the blower fan 33 to both ends of
The structure is such that they are driven to rotate at the same time.

Next, the operation of the dishwasher according to the embodiment of the present invention, the structure of which has been described above, will be described. The dishwasher of this embodiment automatically cleans, rinses, and dries the dishes.

First, in washing the dishes, the dishes 5 and 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 toward you to open it, and the tableware baskets 3 and 4 are opened.
From the cleaning tank 2 to the outside. In this state, after placing the dishes 5 and 6 to be washed in the dish baskets 3 and 4 from which they have been drawn out, the casters work to push them into a predetermined position in the washing tank 2 again. close. Subsequently, washing water is poured into the heater tank 15, and at the same time, dishwashing detergent is added. And the heater 1 in the tank
4 is energized to heat the wash water stored in the heater tank 15. Thereafter, the cleaning motor 7 drives the cleaning pump 8 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 cleaning water is injected into the jet nozzle 9 and the jet nozzle 11.
Is sprayed from and is sprayed on the surfaces of the dishes 5 and 6 to wash the dishes.

Next, the rinsing operation is performed by draining the cleaning water used in the above cleaning operation from the drain hose 24, and then again.
Rinse water is poured into the heater tank 15 to wash the heater 1
Heat the rinse water to 4 to make it warm. 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 is completed, the dishwasher drains the rinsing water from the drain hose 24 to the outside, and subsequently the drying operation is performed.

The drying operation of the tableware after the cleaning will be described. First, when the drying heater 35 shown in FIG.
This is performed by rotating the blower fan 33 by driving the fan motor 38 shown 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 blowing duct 17,
The air is blown into the cleaning tank 2.

The hot air flows from the lower side to the upper side in the washing tank 2 as shown by the broken line arrow 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. , Evaporate the water on the surface of the tableware. The moist hot air that has absorbed the evaporated water is exhausted from the exhaust port at the upper part of the cleaning tank 2 to the exhaust duct 2
1 to be sent to the outer frame heat exchanger 18. Then, the moist 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 and is dehumidified thereby, so that the dehumidified water droplet a on the inner surface of the outer cooling surface 19 Occurs. Further, the moist hot air is also cooled on the inner cooling surface 20 of the outer frame heat exchanger 18 by the forced convection heat transfer by the outside air cooling air sucked by the cooling fan 26,
It is dehumidified, whereby 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 water content of the dishes 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 the 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 sucked into the intake duct 28 through the intake port 29 and blown to the cooling fan casing 27. It The outside air cooling air that has exited the cooling fan casing 27 passes through the air duct 30 and the inner cooling surface 20 of the outer frame heat exchanger 18 and the cooling duct 2.
It is blown to the air passage between 5 and. As described above, the outside air cooling air cools and dehumidifies the moist exhaust hot air inside the outer frame heat exchanger 18 by the inner cooling surface 20. After that, the outside air cooling air flows upward along the inner cooling surface 20 as shown by the solid arrow, and is discharged to the outside 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 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 grow larger, and the dehumidified water is collected in the dehumidified water receiver 23 and discharged from the drain hose 24 to the outside of the machine. . On the other hand, the air in the cleaning tank 2 that has been cooled and dehumidified by the outer frame heat exchanger 18 passes through the circulation duct 22 as shown in FIG. 2, and is circulated again to the blower fan 33 and the fan casing 34, and the drying heater 35.
After being heated at 1, the air is blown to the washing tank 2 and is reused as hot air for drying the dishes.

As described above, according to the above-described first embodiment of the present invention, the dishes after washing and rinsing are dried from the dish surface by the contact between the dishes 5 and 6 and the hot air in the washing tank 2. The evaporation is performed by evaporating the water. At this time, the high-humidity hot air containing the evaporating water is dehumidified by the outer frame heat exchanger 18 and discharged as water drops. 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, high-humidity hot air is cooled and dehumidified, and the hot air after dehumidification is sent to the washing tank 2 again and used for drying dishes. It becomes high-humidity hot air 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 as drops of water by the outer frame heat exchanger 18 in the dishwasher, and therefore, the moisture is contained in the dishwasher. Hot air is no longer discharged to the outside of the machine. In this dishwasher, the cooling air outlet 3
The cooling air that has been warmed through the outer frame heat exchanger 18 is discharged from 1, but this discharged air is blocked 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 water vapor. Therefore, it is possible to prevent a person in front of the dishwasher in the kitchen from being blown with high-humidity hot air to cause discomfort, and there is also no risk of burns. Further, in the vicinity of the exhaust port of the dishwasher, high-humidity exhaust is also cooled by the outside air to cause dew condensation, and the water droplets thereof are also prevented from flowing out.

Further, according to the above-mentioned 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 inner cooling of the outer frame heat exchanger 18 are performed. By the 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 cooling surfaces on the front and back 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 dishes in the cleaning tank 2 can be dried quickly. You can

FIG. 4 is a side sectional view of a dishwasher according to a second embodiment of the present invention. In this second embodiment, the back side surface 45 of the washing tub 2 of the dishwasher is used for cooling and dehumidifying. It is used as a cooling duct (see reference numeral 25 in FIG. 1) of the outer frame heat exchanger 18. In FIG. 4, reference numerals 2 to 31
1 shows the same constitutional requirements as in FIG. 1. Specifically, reference numeral 2 denotes the cleaning tank, reference numeral 18 denotes an outer frame heat exchanger, and reference numeral 19 denotes an outer cooling surface of the outer frame heat exchanger 18. , Reference numeral 20 indicates the inner cooling surface of the outer frame heat exchanger 18, reference numeral 21 indicates the exhaust duct, reference numeral 22 indicates the circulation duct, reference numeral 24 indicates the drain hose, reference numeral 26 indicates the cooling fan, and reference numeral 27 indicates 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 exhaust port.

In the second embodiment, the cleaning tank 2
As is clear from the figure, the inner side surface 45 of the inner side of the outer frame heat exchanger 18 is disposed close to and facing the inner side cooling surface 20 of the outer frame heat exchanger 18 to form an inner side cooling duct, and a space formed between them. The outside air cooling air introduced by the cooling fan 26 is blown to. Further, reference numeral 46 in the drawing denotes a cooling duct installed to connect between the cooling air blowing duct 30 and the inner cooling duct 45, and reference numeral 47 denotes the cooling air passing through the inner cooling duct 45 outside the machine. Is a cooling air exhaust duct for exhausting the cooling air, and reference numeral 31 is a cooling air exhaust port of the cooling air exhaust duct 47.

The operation of the second embodiment, the structure of which has been described above, will be described below. The operation in the washing and rinsing process of the dishes is the same as that of the embodiment of FIGS.
The description of the operation is omitted. When the washing and rinsing of the dishes are completed and the drying process is started, the drying heater (see reference numeral 35 in FIG. 2) is energized and at the same time the fan motor (see reference numeral 38 in FIG. 3) is driven. By driving this fan motor, the blower fan (see reference numeral 33 in FIG. 2) and the cooling fan 26 both rotate.

The air blown by the blower fan is heated by the drying heater (see reference numeral 35 in FIG. 2) to become high-temperature hot air, which is blown into the cleaning tank 2 in the first embodiment. Is the same as. The hot air evaporates the moisture adhering to the surface of the dishes while drying the dishes while contacting the dishes 5 and 6 arranged in the washing tank 2. The hot air, which has absorbed the evaporated water and has become damp, flows into the outer frame heat exchanger 18 from the exhaust port in the upper part of the cleaning tank 2 through the exhaust duct 21 and the outer cooling surface 19 of the outer frame heat exchanger 18. It flows through the space between the inner cooling surfaces 20. The flow of this hot air is indicated by the hollow arrow in the figure.

On the other hand, the outside air as the cooling air is shown by a solid arrow in FIG. First, the bottom plate surface 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 action of the cooling fan 26, and flows into the cooling fan casing 27. Further, this cooling air passes through the cooling air blowing duct 30 and enters the cooling air passage formed between the inner cooling duct 45 which is the inner side surface of the cleaning tank 2 and the inner cooling surface 20 of the outer frame heat exchanger 18. Inflow. At this time, the outside air cooling air cools while contacting the inner cooling surface 20 of the outer frame heat exchanger 18. This cools the moist hot air from the cleaning 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, so that the high-humidity hot air cools the inner surface. The surface 20 is cooled and dehumidified. Then, the outside air cooling air that has passed through the outer frame heat exchanger 18 is then discharged from the cooling air discharge port 31 to the outside of the machine through the discharge duct 47. At the same time, the outer cooling surface 19 of the outer frame heat exchanger 18 is cooled by natural convection heat transfer of the outside air on the back of the dishwasher, which cools the moist hot air from the cleaning tank 2. Dehumidification is performed in the same manner as in the first embodiment. After that, the air that has been cooled and dehumidified in the outer frame heat exchanger 18 is supplied to the circulation duct 2
It goes without saying that the air is returned to the blower fan (see reference numeral 33 in FIG. 2) again through 2 and is heated and then blown to the cleaning 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 it is used, the cleaning tank 2 is fixed to the outer frame body 1. Further, since the wall surface of the cleaning tank 2 has rigidity, a component for attaching the inner cooling duct 45 to the outer frame is unnecessary, and therefore, the protrusion is not formed in the flow path by the attachment component, and the inner cooling duct is not formed. Four
It is possible to make the flow of the outside air cooling air that passes between the inner cooling surface 20 and the inner cooling surface 20 uniform, and 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 shortened.

In the second embodiment, since the back side surface 45 of the cleaning tank 2 is also used as the cooling duct for the outer frame heat exchanger 18, the back side surface of the cleaning tank 2 is the back surface of the outer frame body. , It is possible to increase the volume of the washing tank 2 in the dishwasher of the same size, increase the amount of dishes to be stored in the washing tank 2 and wash more dishes at once. it can. Alternatively, if the washing tanks 2 have the same size, the outer dimensions of the dishwasher can be made thin and small. Furthermore, since the back side surface 45 of the cleaning tank 2 is also used as a cooling duct for the outer frame heat exchanger 18, it is possible to significantly reduce the cost of the heat exchanger component for cooling and dehumidifying. .

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

Further, in the third embodiment, as shown in FIG.
Similarly to the second embodiment shown in FIG.
Is used as an inner cooling duct by closely facing the outer cooling surface 19 of the outer frame heat exchanger 18, and further faces the inner cooling surface 20 of the outer frame heat exchanger 18 on the inner side surface 45. The cleaning tank heat insulating material 48 is provided on the entire mating surfaces.

The operation of the drying process according to the third embodiment of the present invention will be described below. First, similarly to the embodiment shown in FIGS. 1 and 2, the washing and rinsing steps of the dishes are completed, and the drying process is started, which is the same as the above-mentioned 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 the dishes 5 and 6 to evaporate the moisture. After that, the moist hot air that has absorbed the evaporated water flows into the outer frame heat exchanger 18 from the exhaust port in the upper part of the cleaning tank 2 through the exhaust duct 21, and the outer cooling surface 19 of the outer frame heat exchanger 18 It flows through the space between the inner cooling surfaces 20.

On the other hand, the outside air 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 is formed between the inner cooling duct 45 which is the inner side surface of the cleaning tank 2 and the inner cooling surface 20 of the outer frame heat exchanger 18. Flows upward in the air passage. This outside air cooling air cools the inside cooling surface 20 of the outer frame heat exchanger 18 while contacting it, thereby cooling the moist hot air from the cleaning tank 2. That is,
The high-humidity hot air after drying the tableware is cooled by the inner cooling surface 20 of the outer frame heat exchanger 18 and dehumidified.

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

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

[0044]

As is clear from the above detailed description of the embodiments of the present invention, according to the dishwasher of the present invention, in the process of drying dishes, water on the surface of the dishes is evaporated in the washing tank, The high-humidity hot air absorbing this is introduced into the outer frame heat exchanger, cooled to separate water as water droplets, heated again, and blown into the cleaning tank. By repeating this, the dishes are washed and the dishes are dried after the rinsing process. Therefore, the high-humidity hot 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, so that the hot air containing a large amount of moisture in the cleaning tank is discharged to the outside of the machine. It is possible to prevent a person in the vicinity of the dishwasher from feeling uncomfortable and eliminate the risk of burns or the like due to the hot and humid hot air being blown on the person's skin.

Further, according to the dishwasher of the present invention, what is discharged outside the machine is not the hot and humid hot air in the washing tank, but the outside air cooling air warmed by the outer frame heat exchanger 18. Therefore, its humidity has not been increased and therefore
Condensation does not occur even if the exhaust blows near the exhaust port of the dishwasher and is cooled. As a result, as in the conventional dishwasher, the hot and humid hot air discharged from the exhaust port adheres to the surrounding surface to cause dew condensation, which eliminates the problem that this flows out on the surface of the dishwasher, for example. .

Further, in the dishwasher according to the present invention described above, the outer frame heat exchanger has a structure for cooling and dehumidifying high-humidity and high-temperature hot air from the cleaning tank, and the cooling surface of the outer frame heat exchanger is referred to as an outer cooling surface. It can be used as an inner cooling surface.The outer cooling surface is cooled by natural convection heat transfer of the outside air, and the inner cooling surface is cooled by forced convection heat transfer of the outside air cooling air drawn by the 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 dishes can be shortened.

In addition, according to the present invention, the cooling duct is attached to the outer frame body by utilizing the back side surface of the cleaning tank as a cooling duct for the outside air cooling air for cooling the inner cooling surface of the outer frame heat exchanger. Since no parts are required and the flow of the outside air cooling air can be made uniform, the cooling performance on the inner cooling surface of the outer frame heat exchanger is improved, and therefore the dehumidification performance on the outer frame heat exchanger is improved. , The drying time of dishes can be shortened.
Also, by using the back side of the washing tank as the cooling duct of the outer frame heat exchanger, the back side of the washing tank can be brought close to the back of the outer frame of the outer frame body, and the washing tank can be used with the same external dimensions of the dishwasher. It is possible to increase the volume of the table, which makes it possible to increase the amount of dishes to be put in the washing tank and to wash many dishes at once. Furthermore, since the back side of the cleaning tank is shared as the cooling duct of the outer frame heat exchanger,
The cost of the heat exchanger component can also be reduced.

Further, according to the dishwasher of the present invention, the heat in the cleaning tank is cooled inside the outer frame heat exchanger by providing the cleaning tank heat insulating material in the inner cooling duct formed on the back side of the cleaning tank. Since it is prevented from being transmitted to the outside air cooling air sucked 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. Therefore, it is possible to further improve the cooling and dehumidifying performance in the outer frame heat exchanger and further reduce the drying time of the tableware.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an overall configuration of a dishwasher which is a first embodiment of the present invention.

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

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

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

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

[Explanation 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 Receptor 14 Cleaning Water Heater 15 Heater Dunk 16 Pump Casing 17 Blower Duct 18 Outer frame heat exchanger 19 Outer cooling surface 20 Inner cooling surface 21 Exhaust duct 22 Circulation duct 23 Dehumidifying water receiver 24 Drainage hose 25 Cooling duct plate 26 Cooling fan 27 Cooling fan casing 28 Outside air intake duct 29 Intake port 30 Cooling air blowing Duct 31 Cooling air discharge port 32 Opening / closing door 33 Hot air blowing fan 34 Fan casing 35 Drying heater 36 Heater duct 37 Hot air connecting duct 38 Fan motor 39, 40 Rotating shaft 41 Outer frame bottom plate surface 45 Inner cooling duct 46 Cooling air duct 47 Cooling Wind exhaust duct 48 cleaning Insulating material

Claims (15)

[Reference number] [Claims] 1. A washing tank for storing dishes therein, an injection unit disposed in the washing tank for injecting washing water toward the accommodated dishes, and a heater for heating air for drying the washed dishes. A dishwasher equipped with a heating means and a blowing means for blowing the air heated by the heater means into the cleaning tank as hot air, further comprising an air circulation path for drying the dishes. A heat exchanger for cooling and dehumidifying the moist hot air discharged from the washing tank during the dish drying process is disposed in a part of the table. 2. The dishwasher according to claim 1, wherein the heat exchanger is composed of a pair of cooling surfaces that are close to each other and face each other in parallel, and in a space formed between the pair of cooling surfaces. Is a dishwasher characterized by introducing moist hot air discharged from the washing tank. 3. The dishwasher according to claim 2, wherein the heat exchanger is arranged in a part of the outer frame body,
And, one of the cooling surfaces constituting the heat exchanger constitutes an outer cooling surface which is cooled by natural convection heat transfer of outside air on the outer frame surface of the dishwasher, and the other cooling surface of the heat exchanger. Is a dishwasher characterized in that it has an inner cooling surface that is cooled by forced convection heat transfer from outside air that is sucked in from outside the machine. 4. The dishwasher according to claim 3, wherein the heat exchanger is arranged such that an outer cooling surface thereof is located on a back surface of the dishwasher, and a cooling duct is provided in parallel with the inner cooling surface. A dishwasher, wherein outside air cooling air sucked from outside the machine is blown into a space formed between an inner cooling surface of the heat exchanger and the cooling duct. 5. The dishwasher according to claim 4, wherein the cooling duct is formed to extend to an upper surface of an outer frame body of the dishwasher. 6. The dishwasher according to claim 3, wherein a blower fan for blowing heated air for drying the dishes is further provided in a part of an air circulation path for drying the dishes. A dishwasher characterized by being provided. 7. The dishwasher according to claim 6, further comprising a cooling air fan for sucking outside air cooling air from the outside of the heat exchanger to cool the inside of the heat exchanger by forced convection heat transfer. A dishwasher characterized by being provided. 8. The dishwasher according to claim 7, wherein the blower fan and the cooling air fan are rotationally driven by a common rotary drive device. 9. The dishwasher according to claim 4, wherein at least a part of the cooling duct arranged to face an inner cooling surface of the heat exchanger shares a part of a wall surface of the cleaning tank. Dishwasher characterized by forming. 10. The dishwasher of claim 9, wherein
A dishwasher characterized in that a heat insulating material is attached to a surface of a wall surface of the washing tank forming a part of the cooling duct. 11. The dishwasher of claim 1, wherein:
The dishwasher according to claim 1, wherein a drain hose for draining the water cooled and separated in the heat exchanger is attached to a lower portion of the heat exchanger. 12. A washing tank for accommodating dishes therein, an injection unit arranged in the washing tank for injecting washing water toward the accommodated dishes, and a heater for heating air for drying the washed dishes. Means and a blower means for blowing the air heated by the heater means into the washing tank, wherein the heated air for drying the dishes is the washing tank and the heater via a heat exchanger. A dishwasher, characterized in that it is adapted to circulate between means. 13. The dishwasher according to claim 12, further comprising a cooling passage for sucking cooling outside air outside the machine and introducing the cooling outside air into the heat exchanger, and then discharging the cooling outside air outside the machine. Dishwasher characterized by being. 14. A washing tank for accommodating dishes therein, an injection unit arranged in the washing tank for injecting washing water toward the accommodated dishes, and a heater for heating air for drying the washed dishes. And a means for blowing air heated by the heater means into the cleaning tank, further comprising means for separating moisture contained in the air as a liquid, the separating means Thus, the dishwasher is characterized in that moisture is separated as water from the heated air after drying the dishes and discharged out of the machine. 15. A dishwasher having a washing tank for hermetically storing a plurality of dishes, wherein the washing tank is washed, rinsed, and dried in the washing tank, the air in the washing tank and the outside atmosphere are heated. A dishwasher with a heat exchanger inside.