JP2007283122A - Dishwasher/dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dishwasher/dryer capable of lowering the temperature and humidity of heated air discharged from an exhaust port and improving drying efficiency without lowering the capability of a heating means and without reducing the air volume of a blowing means. <P>SOLUTION: The dishwasher/dryer comprises the exhaust port 13 for discharging the heated air inside a washing tub 11 to the outside of the washing tub 11, a circulation path 14 for circulating the heated air inside the washing tub 11, and a blowing means 7 for supplying outdoor air into the washing tub 11 through a blowing path 7a different from the circulation path 14. By supplying the outdoor air into the washing tub 11 through the blowing path 7a, the blowing means 7 pushes out the heated air inside the washing tub 11 to the exhaust port 13 and circulates it to the circulation path 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dishwasher having a function of drying dishes after washing.

  Conventionally, this type of dishwasher has been configured as shown in FIG. Hereinafter, the configuration will be described.

  As shown in FIG. 7, the washing tub 1 is provided in the dishwasher main body A, and a nozzle 2 for injecting washing water is provided rotatably at the substantially center of the bottom of the washing tub 1. Tableware basket 4 in which tableware 3 is arranged is provided. The cleaning pump 5 circulates the cleaning water in the cleaning tank 1, and the heater 6 is a heating means used when heating the cleaning water into hot water. The heater 6 is used to increase the temperature in the cleaning tank 1 and directly warm the dishes 3 in order to evaporate the cleaning water in the drying process after the completion of the cleaning process. The air blowing means 7 is provided at the outer bottom of the cleaning tank 1. In addition, 8 is a drainage pump.

  The operation in the above configuration will be described. First, when the tableware 3 is placed in the tableware basket 4 and accommodated in the washing tank 1 and the operation is started, a predetermined amount of water is supplied into the washing tank 1 from a water supply valve (not shown), and then the washing pump 5 is turned on. To drive. The cleaning water in the cleaning tank 1 is sucked from the drain port 9 by the cleaning pump 5, is pumped to the nozzle 2, and is jetted vigorously by the rotating nozzle 2.

  The tableware 3 arranged in the tableware basket 4 is washed with this washing water. Thereafter, the cleaning water is again sucked from the drain port 9 by the cleaning pump 5, and the above operation is repeated. When the cleaning water enters the cleaning tank 1 in the process of circulating the cleaning water, it is heated by the heater 6. The tableware 3 placed in the tableware basket 4 is washed by repeating the circulation of the washing water.

  After this washing process is completed, the drainage pump 8 is operated, the washing water is discharged from the drain port 9 to the outside of the tank, and after the rinsing process is performed, the drying process is started. After draining the washing water, the heater 6 is heated again to raise the temperature in the washing tank 1, and the tableware 3 is directly warmed, and the water droplets attached to the tableware 3 and the tableware basket 4 are washed. Water droplets remaining in the tank 1 are evaporated.

  The heated air containing a large amount of evaporated water is pushed out of the cleaning tank 1 from the exhaust port 10 by supplying the outside air into the cleaning tank 1 by the blowing means 7. The tableware 3 can be gradually dried by repeating this heating and blowing.

  In order to efficiently dry the washed dishes 3 with such a conventional dishwasher, the temperature in the washing tank 1 is increased by heating means such as the heater 6, and the dishes 3 Is heated directly to increase the evaporation rate of the water droplets attached to the tableware 3 and the tableware basket 4 and the water droplets remaining in the cleaning tank 1, and heated air containing a large amount of evaporated water is blown into the cleaning tank 1 by the blowing means 7. It is necessary to supply outside air to the outside and quickly push it out of the cleaning tank 1.

  However, the higher the capacity of the heater 6 and the greater the air volume of the blower 7, the higher the amount of high-temperature steam discharged from the exhaust port 10 to the outside of the cleaning tank 1 at a time. . The temperature of the steam is as high as about 70 ° C. to 80 ° C., the relative humidity is as high as about 100%, and high temperature and high humidity steam is produced. For this purpose, it is necessary to lower the temperature and humidity of the heated air containing a large amount of steam exiting from the exhaust port 10.

  However, if the capacity of the heater 6 is lowered to reduce the temperature and humidity of the exhaust, and if the air volume of the blowing means 7 is reduced, the drying efficiency is adversely affected.

  The present invention solves the above-mentioned conventional problems, and reduces the temperature and humidity of the heated air coming out from the exhaust port without reducing the capacity of the heating means or reducing the air volume of the blower means, and also the drying efficiency. The purpose is to raise.

  In order to achieve the above-mentioned object, the present invention raises the temperature in the washing tank containing the dishes by heating means to dry the dishes, and supplies the outside air to the washing tank through the air passage by the blowing means. Thus, the heated air in the cleaning tank is pushed out of the cleaning tank through the exhaust port, and the heated air in the cleaning tank is circulated through the circulation passage.

  Thus, the temperature and humidity of the heated air coming out from the exhaust port can be lowered and the drying efficiency can be increased without reducing the capacity of the heating means and reducing the air volume of the blowing means.

  The dishwasher of the present invention reduces the temperature and humidity of the heated air coming out from the exhaust port without increasing the capacity of the heating means or reducing the air volume of the blower means, and further increases the drying efficiency. A dishwasher that can be used can be realized.

  The invention according to claim 1 of the present invention is a cleaning tank containing tableware, heating means for raising the temperature in the cleaning tank to dry the tableware, and cleaning air in the cleaning tank. An exhaust port for discharging to the outside, a circulation path for circulating the heated air in the cleaning tank, and a blowing means for supplying outside air into the washing tank through a ventilation path different from the circulation path, the blowing means Is configured so that heated air in the cleaning tank is pushed out to the exhaust port and circulated in the circulation passage by supplying outside air into the cleaning tank through the air passage. Part of the heated air contained in the air flows into the elongated circulation passage, and while passing through the circulation passage, heat can be exchanged with the wall of the circulation passage to lower the temperature of the heated air, and the temperature of the heated air is lowered. Reduces the amount of saturated moisture Because part of the moisture in the heated air is condensed and remains in the circulation passage, heat exchange occurs between the condensed water and the heated air, further reducing the temperature of the heated air and lowering the absolute humidity. The temperature and humidity of the heated air coming out from the exhaust port can be lowered. In addition, if the circulation path is lengthened, the heat exchange capacity is increased, and even if the capacity of the heating means is increased or the air volume of the blower means is increased, the temperature and humidity of the heated air coming out from the exhaust port can be further lowered. it can. This increases the amount of heated air flowing through the circulation passage, and exhausts while lowering the humidity in the cleaning tank, thereby improving the drying efficiency.

  The invention according to claim 2 is the invention according to claim 1, wherein the circulation passage is separated from the washing tank and has a space between the outer wall of the dishwasher main body, Even if a special member such as a heat-resistant sheet that thermally insulates the circulation passage from the cleaning tank is not used for replacement, air isolation can be achieved by separating from the cleaning tank, and the effect of heat exchange can be obtained. .

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the outlet of the circulation passage to the washing tank is provided in the vicinity of the inlet of the washing passage to the washing tank. Since the temperature difference between the outside air taken in by the means and the heated air in the vicinity of the outlet of the circulation passage in the cleaning tank is large, a flow that draws the flow in the circulation passage can be further created.

  The invention according to claim 4 is the invention according to claims 1 to 3, wherein the inlet of the circulation passage from the cleaning tank and the outlet to the cleaning tank are provided so as to be located diagonally of the cleaning tank, The inlet of the circulation passage from the cleaning tank is provided at the upper part of the cleaning tank, and the heated air in the cleaning tank flows through the cleaning tank without a short pass, and the inlet through which the heated air circulates. Since the convection effect that warm air flows to the upper part can be obtained, the circulation efficiency of the heated air in the cleaning tank and the efficiency of heat exchange can be further improved. Therefore, the temperature and humidity of the heated air coming out from the exhaust port can be further reduced.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein a heat exchanger is provided in the middle of the circulation passage, and the heat exchange capability performed by the circulation passage and the heated air. In addition, since the effect of lowering the temperature and humidity of the heated air is added by the heat exchanger, the effect of lowering the temperature and humidity of the heated air is further enhanced. In addition, if the circulation passage is formed into a narrow and narrow passage, the amount of heat entering the heat exchanger can be reduced, so that the ability of the heat exchanger can be maintained high.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description.

(Embodiment 1)
As shown in FIG. 1, the washing tub 11 is provided in the dishwasher main body 12, and the tableware basket 4 in which the tableware 3 is arranged is provided in the washing tub 11. The heater 6 is a heating means used for heating the cleaning water to make hot water. The heater 6 elevates the temperature in the cleaning tank 11 in order to evaporate the cleaning water in the drying process after the cleaning process is completed. It is used for heating the tableware 3 directly.

  The air blowing means 7 is provided at the outer bottom of the cleaning tank 11 and supplies outside air into the cleaning tank 11 through the first air passage 7a. The exhaust port 13 discharges the heated air in the cleaning tank 11 to the outside of the tank. The cleaning tank 11 is provided with a circulation passage 14 for circulating the heated air in the cleaning tank 11, an inlet 14 a for circulating the heated air in the cleaning tank 11 is provided in the upper part of the cleaning tank 11, and an outlet 14 b is provided in the lower part of the cleaning tank 11. The circulation path 14 connects the inlet 14a and the outlet 14b. Here, as shown in FIG. 2, the inlet 14 a and the outlet 14 b are provided so as to be positioned diagonally to the cleaning tank 11. The circulation passage 14 is configured to be thermally insulated from the cleaning tank 11.

  The operation in the above configuration will be described. First, when the tableware 3 is placed in the tableware basket 4 and accommodated in the washing tank 11 and the operation is started, a predetermined amount of water is supplied into the washing tank 11 from a water supply valve (not shown), and then the washing pump 5 is driven. The cleaning water in the cleaning tank 11 is sucked from the drain port 9 by the cleaning pump 5, is pumped to the nozzle 2, and is jetted vigorously by the rotating nozzle 2.

  The tableware 3 arranged in the tableware basket 4 is washed with this washing water. Thereafter, the cleaning water is again sucked from the drain port 9 by the cleaning pump 5, and the above operation is repeated. In the process of circulating the washing water, when the washing water enters the washing tank 11, it is heated by heating means such as the heater 6, and the dishes 3 and the like placed in the tableware basket 4 by repeating the circulation of the washing water. Wash.

  After completion of this washing process, the drainage pump 8 is operated, and the washing water is discharged from the drain port 9 to the outside of the tank. After the rinsing process, the drying process is started. In the drying process, the heater 6 is heated again to raise the temperature in the washing tub 11, and the tableware 3 is directly warmed, so that water drops adhering to the tableware 3 and the tableware basket 4, The remaining water droplets are evaporated.

  A part of the heated air containing a large amount of evaporated water is supplied from the exhaust port 13 to the outside of the cleaning tank 11 by supplying the outside air through the first air passage 7 a into the cleaning tank 11 by the blowing means 7. Extruded. At this time, the outside air enters the cleaning tank 11 from the inlet 11a that supplies the outside air, and the heated air exits from the outlet 11b that discharges the heated air from the inside of the cleaning tank 11. With this heated air, the tableware 3 can be gradually dried.

  In this drying process, part of the heated air flows into the circulation passage 14. The flow in the circulation passage 14 causes natural convection from the lower part to the upper part of the washing tank 11 in the washing tank 11 due to a temperature difference between the inlet 14a and the outlet 14b of the circulation passage 14 in the washing tank 11. . Since the heating means 6 is provided in the lower part of the cleaning tank 11, the temperature of the heated air in the lower part of the cleaning tank 11 is high.

  At this time, a flow supplied into the cleaning tank 11 is simultaneously applied by the blowing means 7. Therefore, a flow that is pushed into the circulation passage 14 is generated by the dynamic pressure of the flow at the inlet 14a of the circulation passage 14, and a flow that is drawn into the cleaning tank 11 is generated at the outlet 14b. As a result, a flow is generated in the circulation passage 14. Arise. In the circulation passage 14, the heated air containing a large amount of steam exchanges heat with the wall surface of the circulation passage 14 while passing through the circulation passage 14, and the temperature of the heating air decreases.

  Moreover, the fact that the temperature is lowered in the circulation passage 14 also ensures that the temperature difference between the inlet 14a and the outlet 14b of the circulation passage 14 can be continuously maintained. At this time, the outside air taken in by the blowing means 7 is colder than the heated air in the cleaning tank 11, and this action also creates a flow that draws the flow in the circulation passage 14.

  Moreover, if the circulation passage 14 is thermally insulated from the cleaning tank 11 to form a long and narrow passage, the area of the wall surface of the circulation passage 14 in contact with the heated air for heat exchange is expressed by passage length × outer circumference. Largely secured. Even in the space-saving of the dishwasher main body 12, the passage length can be secured as compared with the case where the cross section is large. Therefore, the heat exchange capability can be increased. As a result, while the heated air containing a large amount of steam passes through the elongated circulation passage 14, heat exchange is performed with the wall surface of the circulation passage 14 to lower the temperature of the heating air.

  Furthermore, if the material of the circulation passage 14 has a high heat capacity, even if the temperature of the dishwasher main body 12 with the circulation passage 14 is high, the circulation passage 14 itself exchanges heat, serves as a condenser, and reduces the amount of heat. Will accumulate. Conversely, if the heat capacity is low, the amount of heat is stored immediately. When the difference between the temperature of the heated air and the temperature of the circulation passage 14 disappears, the stored amount of heat is dissipated from the wall of the circulation passage 14 by turning off the heater 6, thereby saving energy during drying. Become.

  In addition, the temperature drop in the circulation passage 14 means that a temperature difference between the inlet 14a and the outlet 14b of the circulation passage 14 in the washing tank 11 can be continuously secured, and is discharged from the outlet 14b of the circulation passage 14. The heated air thus heated is heated by the heater 6 and again causes natural convection.

  Thus, since the circulation passage 14 can store a large amount of heat, the effect is enhanced. This heat exchange is possible because the temperature of the heated air is as high as 70 ° C. to 80 ° C. and the circulation passage 14 is at room temperature, so that a large temperature difference can be made. Therefore, the circulation passage 14 needs to be thermally insulated from the cleaning tank 11.

  In addition, since the saturated moisture content decreases as the temperature of the heated air decreases, a portion of the moisture in the heated air is condensed and remains in the circulation passage 14. A new heat exchange occurs between the condensed water and the heated air, and the effect is further enhanced. As a result, condensation of the heated air occurs and the humidity can be lowered.

  Therefore, the temperature and humidity of the heated air that has returned to the cleaning tank 11 are lower than before entering the circulation passage 14. Therefore, the temperature and humidity of the heated air exiting from the exhaust port 13 can be lowered.

  Further, if the opening area of the exhaust port 13 is made smaller than the opening area of the circulation passage 14, the amount of heated air flowing through the circulation passage 14 increases due to the difference in resistance (pressure) at the inlet. Therefore, the amount of heated air that is directly discharged decreases, and the amount of heated air that decreases in temperature and humidity due to heat exchange increases. Therefore, the temperature and humidity of the heated air exiting from the exhaust port 13 can be further reduced.

  Further, if the circulation passage 14 is lengthened, the heat exchanging capacity is increased, and even if the capacity of the heating means such as the heater 6 is increased or the air volume of the air blowing means 7 is increased, the heated air flowing out from the exhaust port 13 is increased. The temperature and humidity can be further reduced, and the drying efficiency can be increased.

  Moreover, since the amount of steam discharged from the exhaust port 13 during drying is as large as about 100 ml even in a single operation, there is a problem of dampness in the house. However, in the present embodiment, the humidity of the heated air can be lowered, so that the problem of moisture is also improved.

  Further, by providing the inlet 14a and the outlet 14b of the circulation passage 14 for circulating the heated air so as to be located diagonally to the cleaning tank 11, the heating air in the cleaning tank 11 does not cause a short pass, and the cleaning tank 11 Since the inlet 14a for circulating the heated air from the end to the end is provided at the upper portion, the effect of convection that warm air flows to the upper portion can be obtained. Circulation efficiency and heat exchange efficiency can be improved. Therefore, the temperature and humidity of the heated air coming out from the exhaust port 13 can be further reduced.

  In addition, if the circulation passage 14 is provided separately from the washing tank 11 as in the present embodiment, a special heat-resistant sheet or the like that thermally insulates the circulation passage 14 from the washing tank 11 in order to exchange heat. Even if the member is not newly used, it is possible to insulate the air by separating it from the cleaning tank 11, and to obtain the effect of heat exchange.

  Further, as in the present embodiment, the outlet 14b for circulating the heated air is provided in the vicinity of the inlet 11a of the blowing means 7 for supplying outside air into the cleaning tank 11, so that the blowing means 7 is provided. The temperature difference between the outside air taken in by the air and the heated air near the outlet 14b of the circulation passage 14 in the cleaning tank 11 is also large. Therefore, a flow that draws the flow in the circulation passage 14 can be further created.

  FIG. 3 is a graph of experimental results showing the temperature change at the outlet of the exhaust port 13 of the present embodiment (dotted line) using the circulation passage 14 and the conventional example (solid line). As is clear from FIG. 2, the temperature of the exhaust gas is lower than that of the conventional example.

(Embodiment 2)
As shown in FIG. 4, the circulation passage 15 circulates heated air in a cleaning tank (not shown), and a second blower 16 is provided in the middle of the circulation passage 15. Other configurations are the same as those of the first embodiment.

  The operation in the above configuration will be described. By providing the second blower means 16 in the middle of the circulation passage 15, natural convection occurs in the washing tank due to a temperature difference between the inlet and the outlet of the circulation passage 14 in the washing tank, and at the same time, the washing tank causes the washing tank to Therefore, the flow supplied to the inside of the circulation passage 15 is added, so that the dynamic pressure of the flow at the inlet of the circulation passage 15 causes a flow further pushed out into the circulation passage 15 and the flow at the outlet is drawn into the washing tank. The flow generated in the circulation passage 15 can be forcibly created.

  The flow in the circulation passage 15 is a natural convection and a flow due to the effect of the dynamic pressure of the flow, and is very slow. However, the flow can be made faster by creating a flow with the second blowing means 16. Accordingly, the amount of heated air to be circulated increases, and the effect of lowering the temperature and humidity of the heated air is enhanced. Moreover, since the humidity in a washing tank falls quickly, the drying performance in tableware and a washing tank can be improved.

(Embodiment 3)
As shown in FIG. 5, the circulation passage 17 circulates heated air in a cleaning tank (not shown), and a heat exchanger 18 is provided in the middle of the circulation passage 17. Other configurations are the same as those of the first embodiment.

  The operation in the above configuration will be described. By providing the heat exchanger 18 in the middle of the circulation passage 17, in addition to the heat exchange capability that the circulation passage 17 and the heated air have performed, the heat exchanger 18 has the effect of lowering the temperature and humidity of the heating air. The effect of lowering the temperature and humidity of the heated air is further increased. In addition, if the circulation passage 17 has a narrow and narrow cross section, the amount once entering the heat exchanger 18 can be reduced, so that the ability of the heat exchanger 18 can be maintained high.

  Moreover, since the humidity of the heated air is greatly reduced by the heat exchanger 18 as compared with the circulation passage 17 alone, it is possible to improve the drying performance of tableware, tableware baskets and the like in the cleaning tank.

(Embodiment 4)
As shown in FIG. 6, the circulation passage 19 circulates the heated air in the cleaning tank 11. An inlet 19 a for circulating the heated air in the cleaning tank 11 is provided in the upper part of the cleaning tank 11, and the outlet 19 b is cleaned. Provided in the lower part of the tank 11, the inlet 19 a and the outlet 19 b are connected by a circulation passage 19. The circulation passage 19 is branched halfway and connected to the exhaust port 13. Other configurations are the same as those of the first embodiment, and the same reference numerals are given and description thereof is omitted.

  The operation in the above configuration will be described. The elongated circulation passage 19 is branched halfway and one is connected to the exhaust port 13, and the other is directly connected to the outlet 19 b of the circulation passage 19 provided in the cleaning tank 11. With this configuration, when heated air is discharged, it is always discharged through the circulation passage 19. Accordingly, it is possible to eliminate the heated air that is directly exhausted without being subjected to heat exchange in the circulation passage 19.

  Therefore, the heated air always passes through the circulation passage 19 once, and heat is exchanged to lower the temperature and humidity. Therefore, the temperature and humidity of the heated air exiting from the exhaust port 13 can be further reduced.

  Further, the temperature and humidity of the heated air can be further reduced by changing the area ratio between the cross section of the circulation passage 19 connected to the exhaust port 13 of the circulation passage 19 and the cross section of the outlet 19b of the circulation passage 19 of the cleaning tank 11. Can also improve the drying performance. When aiming at the former, the cross-section of the circulation passage 19 connected to the exhaust port 13 should be reduced, and when aiming at the latter, it should be increased.

  As described above, the dishwasher according to the present invention reduces the temperature and humidity of the heated air coming out from the exhaust port without reducing the capacity of the heating means and reducing the air volume of the blower means. Since it is possible to increase the drying efficiency, it is useful as a dishwasher having a drying function.

Sectional drawing of the dishwasher of Embodiment 1 of this invention Partial cutaway perspective view of the dishwasher Time chart showing temperature changes of the dishwasher and the conventional exhaust vent Side view of the main part of the dishwasher according to Embodiment 2 of the present invention Sectional drawing of the principal part of the dishwasher of Embodiment 3 of this invention Sectional drawing of the dishwasher of Embodiment 4 of this invention Cross-sectional view of a conventional dishwasher

Explanation of symbols

3 Tableware 6 Heater (heating means)
7 Air blowing means 7a First air passage (air passage)
11 Washing tank 13 Exhaust port 14 Circulation passage

Claims (5)

A washing tub containing tableware, heating means for raising the temperature in the washing tub to dry the tableware, an exhaust port for discharging heated air in the washing tub to the outside of the washing tub, and in the washing tub A circulation passage that circulates the heated air, and a blowing means that supplies outside air into the cleaning tank through a ventilation path that is different from the circulation path, and the blowing means passes outside air through the ventilation path in the cleaning tank. A dishwasher configured to push the heated air in the washing tank to the exhaust port and to circulate it through the circulation passage by supplying to the circulation passage. The dishwasher according to claim 1, wherein the circulation passage is separated from the washing tank and has a space between the outer wall of the dishwasher main body. The dishwasher according to claim 1 or 2, wherein an outlet of the circulation passage to the washing tank is provided in the vicinity of the inlet of the air passage to the washing tank. The inlet from the washing tank of the circulation passage and the outlet to the washing tank are provided so as to be located diagonally of the washing tank, and the inlet from the washing tank of the circulation passage is provided at the upper part of the washing tank. The dishwasher of any one of 1-3. The dishwasher according to any one of claims 1 to 4, wherein a heat exchanger is provided in the circulation path.

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