JP6145637B2 - Dishwasher - Google Patents

Description

  The present invention relates to a dishwasher that is installed in a kitchen or the like and performs automatic washing and drying of an object to be washed such as tableware.

  Conventionally, a dishwasher that does not exhaust in the drying process is provided with a circulation air passage for circulating the air in the tank and a dehumidifying section in the circulation air path to dry the dishes stored in the washing tank. It has a configuration in which the humid air in the tank is sent to the air path, and after the dehumidifying unit dehumidifies, the dried air is again introduced into the tank (for example, see Patent Document 1).

  FIG. 6 is a side cross-sectional view of a conventional dishwasher described in Patent Document 1, and shows the air flow in the drying process. In FIG. 6, a housing 101 of the dishwasher is provided with a washing tub 103 that can be opened and closed by a door 102, and an object to be cleaned 104 such as tableware is set in a tableware basket 105 and accommodated in the washing tub 103. . The water supply valve 106 supplies cleaning water to the cleaning tank 103. The cleaning pump 107 pressurizes the cleaning water and supplies it to the cleaning nozzle 108 provided with a plurality of injection ports, and the cleaning water is sprayed from the cleaning nozzle 108 to clean the object 104 to be cleaned.

  In the operation of the dishwasher, the controller 124 performs a washing process, a rinsing process, and a drying process. In the drying process, the internal circulation fan 114 sends air from the dehumidification path 115 to the cleaning tank 103, passes through the cleaning tank 103, the moisture absorption unit 116, and the heat exchange means 117, and returns to the internal circulation means 114 again. The air in the cleaning tank 103 is circulated. In the condensation path 118 outside the cleaning tank 103, the condensation path circulation blower 119 circulates the air in the condensation path 118. From the condensation path circulation blower 119, the regeneration unit heater 120, the regeneration unit 121, and the heat exchange unit 117 are transferred. It is configured to pass through and return to the condensation path circulation blower 119 again.

  The moisture absorption part 116 on the cleaning tank 103 side and the regeneration part 121 on the condensation path 118 side are rotated by a rotating means (not shown), and the moisture absorption part 116 and the regeneration part 121 are gradually replaced. The water in the cleaning tank 103 adsorbed by the moisture absorption unit 116 is desorbed by the regenerating unit 121, and the water condensed by the heat exchanger 117 of the condensation path 118 is collected and passes through the condensed water drainage path 123, and the drainage path. 109 is drained. Thus, it can respond to a continuous drying operation by performing dehumidification and regeneration simultaneously.

  In addition, the drying mechanism using the circulation air passage as described above is an exhaust port for discharging humid air in the washing tank to the outside of the machine when used in a dishwasher installed in a system kitchen or the like. It is possible to have a configuration in which the front surface of the housing is not provided. Then, since the decorative plate of the system kitchen can be attached to the entire front door of the casing, the dishwasher / dryer is excellent in design with a sense of unity in the design of the system kitchen.

JP 2010-094247 A

However, in the conventional configuration, in the drying process, the drying mechanism can efficiently dehumidify in the early stage of drying in which the humidity of the air in the washing tank is high, but the effect of dehumidification is at a stage where the drying has progressed to some extent. It drops significantly. This is because most of the dehumidifying parts use the difference in temperature of the saturated water vapor amount of the air, and when the humidity of the air sent to the circulation air passage becomes 100% or less, condensation due to lowering the temperature is less likely to occur. And the dehumidifying effect is reduced.

  The present invention solves the above-mentioned conventional problems, and when the efficiency of a drying mechanism using dehumidification due to adsorption or condensation is reduced, the drying efficiency can be improved by using a supply / exhaust mechanism. It is. With this configuration, it is possible to provide a dishwasher with improved drying efficiency while having an excellent design that can eliminate the exhaust port on the front door and attach the decorative panel of the system kitchen to the entire door. Objective.

  In order to achieve the above object, the present invention provides a cleaning tank in which an object to be cleaned is accommodated in a housing, a cleaning nozzle for injecting cleaning water in the cleaning tank, and a pressurized water supply to the cleaning nozzle. A cleaning pump, a heating unit that heats the cleaning water, and a control unit that controls a series of operations of the cleaning process, the rinsing process, and the drying process. Air outside the cleaning tank is supplied to the cleaning tank. An air supply passage that introduces air, an exhaust air passage that discharges the air in the cleaning tank to the outside of the cleaning tank, and a communication air that communicates the air supply side connection portion of the air supply air passage and the exhaust side connection portion of the exhaust air passage. A dehumidifying part for dehumidifying the air passing through the communication air path in the communication air path, and a blower part in the air supply air path between the air supply side connection part and the cleaning tank A first damper in the communication air passage between the dehumidifying part and the exhaust side connection part, and the supply side connection A second damper is connected to the air supply air path outside the cleaning tank, and a third damper is connected to the exhaust air path outside the cleaning tank from the exhaust side connection portion where the exhaust air path and the communication air path are connected. And the exhaust outlet of the exhaust air passage is provided in the housing, and the control unit adjusts the three dampers during operation of the drying step to operate the air blowing unit, A dishwasher configured to switch between a circulation operation in which a circulation path is formed between the washing tank and the communication air passage so as not to supply and exhaust, and a supply and exhaust operation in which the circulation path is restricted to supply and exhaust air It is.

  With this configuration, when the dehumidification by the circulation operation is performed in the drying process, and the drying efficiency by the dehumidifying unit has been reduced, the drying efficiency is improved by switching to the air supply / exhaust operation and discharging the air in the cleaning tank. Can do. In addition, since the air in the cleaning tank to be discharged has a relative humidity of 100% or less, there is little adverse effect such as dew condensation even when exhausted into the housing, so there is no need to provide an exhaust port on the front door. It can have an excellent design that can attach the decorative panel of the system kitchen to the whole door.

  The dishwasher of the present invention can improve drying performance while maintaining excellent design.

Side surface sectional drawing of the circulation path state of the dishwasher in Embodiment 1 of this invention Side surface sectional drawing of the air-conditioning state of the dishwasher in Embodiment 1 of this invention (A) Side surface sectional view of the circulation path state of the dishwasher in Embodiment 2 of the present invention (b) Side surface sectional view of the dishwasher in the air supply / exhaust state (A) Side cross-sectional view of the circulation path state of the dishwasher in Embodiment 3 of the present invention (b) Side cross-sectional view of the dishwasher in the supply and exhaust state Side surface sectional drawing of the circulation path state of the dishwasher in Embodiment 4 of this invention Vertical section of a conventional dishwasher

The first invention includes a cleaning tank in which an object to be cleaned is housed in a housing, a cleaning nozzle for injecting cleaning water in the cleaning tank, a cleaning pump for supplying the cleaning water to the cleaning nozzle under pressure, A supply air passage that includes a heating unit that heats the cleaning water and a control unit that controls a series of operations of the cleaning process, the rinsing process, and the drying process, and introduces air outside the cleaning tank into the cleaning tank. And an exhaust air passage for discharging the air in the cleaning tank to the outside of the cleaning tank, and a communication air passage communicating the supply side connection portion of the supply air passage and the exhaust side connection portion of the exhaust air passage. The communication air passage has a dehumidifying portion for dehumidifying air passing through the communication air passage, and the air supply air passage between the air supply side connection portion and the cleaning tank has a blower portion, and the dehumidification portion A first damper in the communication air path between the exhaust portion and the exhaust side connection portion, and the front side of the cleaning tank outside the supply side connection portion A second damper in the supply air passage; and a third damper in the exhaust air passage outside the cleaning tank from an exhaust side connection portion to which the exhaust air passage and the communication air passage are connected. An exhaust outlet of a passage is provided in the casing, and the control unit adjusts the three dampers during operation of the drying process to operate the air blowing unit, thereby causing the cleaning tank, the communication air path, The dishwasher is configured to switch between a circulation operation in which a circulation path is formed and no air supply / exhaust is performed, and a supply / exhaust operation in which the circulation path is restricted to supply and exhaust air.

  With this configuration, when the dehumidification by circulation operation is performed in the drying process and the drying efficiency by the dehumidifying unit has been reduced, the efficiency of the drying is improved by switching to the air supply / exhaust operation and exhausting the air in the cleaning tank to the outside of the tank. Can be improved. In addition, since the air in the cleaning tank to be discharged has a relative humidity of 100% or less, there is little adverse effect such as dew condensation even when exhausted into the housing, so there is no need to provide an exhaust port on the front door. It can have an excellent design that can attach the decorative panel of the system kitchen to the whole door.

  According to a second invention, in the first invention, instead of the first damper and the third damper, a switching damper is provided in the exhaust side connection portion, and the switching damper closes the communication air passage. Then, the exhaust air passage is opened, and the communication air passage is opened when the exhaust air passage is closed. With this configuration, the damper and the drive source of the damper are reduced, and a simple and highly reliable damper configuration is possible.

  According to a third invention, in the first invention, instead of the first damper, the second damper, and the third damper, a composite damper is provided in the exhaust side connection portion, and the air supply air path A damper is disposed adjacent to the exhaust-side connection portion, and the composite damper is configured such that the valve body on the exhaust-side connection portion side and the valve body on the air supply air passage side are arranged at a predetermined angle around a rotation axis. When the exhaust air passage and the air supply air passage are closed, the combined damper opens the communication air passage, and when the communication air passage is closed, the composite damper forms the exhaust air passage and the air supply air passage. And is configured to open. With this configuration, the damper and the drive source of the damper are further reduced, and a simpler and more reliable damper configuration is possible.

  In a fourth aspect of the invention, a cleaning tank in which an object to be cleaned is housed in a housing, a cleaning nozzle that injects cleaning water in the cleaning tank, a cleaning pump that supplies pressurized cleaning water to the cleaning nozzle, A supply air passage that includes a heating unit that heats the cleaning water and a control unit that controls a series of operations of the cleaning process, the rinsing process, and the drying process, and introduces air outside the cleaning tank into the cleaning tank. And an exhaust air passage that discharges the air in the cleaning tank to the outside of the cleaning tank, a communication air passage that communicates the air supply side connection portion of the air supply air path and the cleaning tank, and the communication air path A dehumidifying part for dehumidifying the air passing through the communication air path; a ventilation part in the air supply air path between the air supply side connection part and the cleaning tank; and the dehumidification part and the exhaust side connection A first damper is provided in the communication air passage between the air supply portion and the second air supply air passage provided outside the cleaning tank from the air supply side connection portion. A damper and a third damper in the exhaust air passage; an exhaust outlet of the exhaust air passage is provided in the housing; and the control unit adjusts the three dampers during the operation of the drying process Then, by operating the air blowing unit, a circulation operation in which a circulation path is formed between the cleaning tank and the communication air passage and no supply / exhaust is performed, and a supply / exhaust operation in which the circulation path is restricted to supply and exhaust air A dishwasher configured to switch between.

  With this configuration, when the dehumidification by circulation operation is performed in the drying process and the drying efficiency by the dehumidifying unit has been reduced, the efficiency of the drying is improved by switching to the air supply / exhaust operation and exhausting the air in the cleaning tank to the outside of the tank. Can be improved. In addition, since the air in the cleaning tank to be discharged has a relative humidity of 100% or less, there is little adverse effect such as dew condensation even when exhausted into the housing, so there is no need to provide an exhaust port on the front door. It can have an excellent design that can attach the decorative panel of the system kitchen to the whole door. Furthermore, when the operation is switched from the circulation operation to the supply / exhaust operation, the flow of air in the cleaning tank changes, there is no deviation in the degree of progress of drying of the objects to be cleaned in the cleaning tank, and the objects to be cleaned can be dried throughout. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Further, the present invention is not limited by this embodiment.

(Embodiment 1)
1 and 2 are side sectional views of the dishwasher according to Embodiment 1 of the present invention, and show a drawer-type built-in type dishwasher housed in a system kitchen. FIG. 1 and FIG. 2 are different in the operation state of a damper described later, FIG. 1 shows a circulation path state, and FIG. 2 shows an external air supply / exhaust state.

  1 and 2, the dishwasher is provided with a washing tub 2 inside a housing 1 having an opening in the front. The cleaning tank 2 has rails (not shown) below the left and right lateral sides, and is supported by the housing 1 so as to be able to move in the front-rear direction. The washing tub 2 has a door 3 that covers the opening of the housing 1 in the front, the upper surface is opened, and a tableware basket 5 that accommodates an object to be cleaned 4 such as tableware is arranged therein. The water supply valve 6 opens and closes the branch from the water pipe and supplies the cleaning water to the cleaning tank 2.

  A cleaning nozzle 7 is rotatably provided below the tableware basket 5, and the cleaning water stored in the cleaning tank 2 is pressurized and fed by the cleaning pump 8 and sprayed from the cleaning nozzle 7, and the object to be cleaned 4 is discharged. Wash. A heating unit 9 such as a heater for heating the cleaning water is provided at the bottom of the cleaning tank 2, and a temperature sensor 10 for detecting the temperature of the cleaning water or air in the cleaning tank 2 through the cleaning tank 2 is disposed outside the bottom surface. It is installed. The front portion of the cleaning tank 2 is provided with a control unit 11 that controls a series of operations such as a cleaning process, a rinsing process, and a drying process.

  Between the washing tank 2 and the door 3, an air passage through which air flows in the drying process is provided. An air supply passage 12 is provided at the lower portion, and has an air supply port 14 and a blower port 15. A blower 13 such as a fan provided in the air supply air passage 12 sucks air outside the cleaning tank from the air supply port 14 and introduces it into the cleaning tank 2 from the air supply port 15 (state of FIG. 2). An exhaust air passage 16 is provided in the upper part, and has an in-tank exhaust port 17 and an out-tank exhaust port 18 as an exhaust outlet. The tank outside exhaust port 18 is provided in the housing 1 and is opened to the outside of the cleaning tank 2. By the operation of the air blowing section 13 provided in the air supply air passage 12, the air in the cleaning tank 2 is led out from the in-tank exhaust port 17 and discharged from the out-tank exhaust port 18 into the housing 1 (state of FIG. 2). ).

  The cleaning tank 2 has a communication air passage 19 that connects the air supply side connection portion 12 a of the air supply air passage 12 and the exhaust side connection portion 16 a of the exhaust air passage 16. The communication air passage 19 includes a dehumidifying unit 20 and a temperature / humidity sensor 21, and dehumidifies the passing air. The structure of the dehumidifying unit 20 includes an adsorption / desorption mechanism using a moisture adsorbent such as zeolite, a condensing mechanism using a cooler such as a Peltier element or a heat pump device, and cooling air introduced from the outside of the housing 1. It may be a condensing mechanism using heat exchange, and is not limited.

In addition, a first damper 22 that opens and closes the communication air passage 19 is provided in the communication air passage 19 between the dehumidifying unit 20 and the exhaust side connection portion 16a. In addition, a second damper 23 is provided in the air supply air passage 12 between the air supply side connecting portion 12a and the air supply port 14, and the exhaust air air passage 16 between the exhaust side connecting portion 16a and the outside air exhaust port 18 is provided. A third damper 24 is provided. These dampers are driven by an electric motor or the like. The air blowing unit 13 described above is provided between the air supply side connection unit 12a and the air blowing port 15 on the cleaning tank side. As shown in FIG. 1, when the second damper 23 and the third damper 24 are closed, the communication air passage 19 passes through the supply air passage 12, the air blowing unit 13, the cleaning tank 2, and the exhaust air passage 16. To form a circulation path.

  About the dishwasher comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. The user grasps the handle 3a formed on the door 3 and pulls the cleaning tank 2 forward from the housing 1, sets the object to be cleaned 4 such as tableware in the tableware basket 5, and accommodates it in the cleaning tank 2. Set the operation with the operation unit that does not, and start operation. When the operation is started, the control unit 11 adheres to the object to be cleaned 4 and the cleaning tank 2 based on the operation setting, a cleaning process for removing the dirt of the object 4 to be cleaned, a rinsing process for flowing the attached detergent and residue, and the like. It performs in order of the drying process which dries the water | moisture content.

  First, the control part 11 opens the water supply valve 6 with the start of a washing | cleaning process, and supplies water to the washing tank 2, and if water supply of a predetermined amount is performed, the water supply valve 6 will be closed and water supply will be stopped. Then, the cleaning pump 8 is operated while energizing the heating unit 9 such as a heater to heat the cleaning water, and hot water is sprayed from the cleaning nozzle 7 and sprayed onto the object to be cleaned 4. The cleaning nozzle 7 is rotated by the reaction force sprayed by the cleaning water, and the cleaning water spreads over the object 4 to be cleaned, thereby increasing the cleaning effect. The temperature sensor 10 stops energization to the heating unit 9 when detecting that the cleaning water has reached a predetermined temperature or higher. After performing a predetermined cleaning operation, the control unit 11 causes the cleaning water containing dirt to be discharged out of the housing through the drain pipe 25 by rotating the cleaning pump 8 in the reverse direction, thereby completing the cleaning process.

  Next, the control unit 11 starts a rinsing process and supplies new cleaning water to the cleaning tank 2. By operating the cleaning pump 8, the cleaning water is sprayed again from the cleaning nozzle 7, thereby rinsing the object 4 to be cleaned to which detergent, residue, etc. are attached. After performing the rinsing operation for a predetermined time, the operation of discharging the cleaning water and supplying the cleaning water again is repeated a predetermined number of times. Finally, the washing water is discharged and the rinsing process is completed.

  In addition, in order to dry the to-be-cleaned object 4 efficiently in a short time in the drying process performed after this rinse process, it is preferable that the to-be-cleaned object 4 is warmed at the start of a drying process. Therefore, the final rinsing operation is performed with high-temperature water at 60 ° C. to 70 ° C. and can be sterilized.

  Subsequently, the control unit 11 performs a drying process. At the start of the drying process, as shown in FIG. 1, the control unit 11 opens the first damper 22 to connect the communication air passage 19 and closes the second damper 23 and the third damper 24 to circulate. A path is formed, and dehumidification is performed by a circulation operation in which the cleaning tank 2 is not supplied and exhausted. That is, the air blowing unit 13 is operated, air is circulated along the circulation path, and moisture adhered to the object 4 to be cleaned and the surface of the cleaning tank 2 is evaporated and dried. The humid air that has dried the surface of the cleaning object 4 and the cleaning tank 2 flows into the communication air passage 19 from the cleaning tank 2 and passes through the dehumidifying unit 20 to be dehumidified. The dehumidified air becomes low-humidity air and is sent to the cleaning tank 2 in order to dry the cleaning object 4 again. At this time, by energizing the heating unit 9 and heating the circulating air, drying of moisture adhering to the surface of the cleaning object 4 and the cleaning tank 2 is promoted, and the drying efficiency is improved.

However, if the humidity of the circulating air decreases as the drying process proceeds, the efficiency of the dehumidifying unit 20 decreases. Therefore, when the humidity detected by the temperature / humidity sensor 21 provided in the communication air passage 19 falls below a predetermined value, the control unit 11 operates the first to third dampers, and the flow rate of the communication air passage 19 is increased. Is switched to the air supply / exhaust operation in which the air circulation in the cleaning tank 2 is changed to the air supply / exhaust state to supply the external air to the cleaning tank 2.
In FIG. 2, the three dampers are in a state where the first damper 22 is closed to close the communication air passage 19, the second damper 23 is opened to open the air supply air passage 12, and the third damper 24 is open. The exhaust air passage 16 is opened.

  The operation and action at this time will be described. When the control unit 11 operates the air blowing unit 13, air outside the cleaning tank 2 is sucked from the air supply port 14, passes through the air supply air passage 12 and the air blowing unit 13, and is introduced into the cleaning tank 2 from the air blowing port 15. The supplied air dries moisture adhering to the cleaning object 4 in the cleaning tank 2 and the surface of the cleaning tank 2. The air that has dried the surfaces of the cleaning object 4 and the cleaning tank 2 is led out from the in-tank exhaust port 17 to the exhaust air passage 16 and is discharged from the out-tank exhaust port 18 to the outside of the cleaning tank 2. At this time, the operation of the dehumidifying unit 20 is stopped, but since the humidity of the discharged air is lower than the humidity at the initial stage of the drying process, there is little risk of condensation in the housing. Depending on the degree of progress of drying, the control unit 11 may adjust the opening of the three dampers so that the communication air passage 19 is also communicated and the dehumidifying unit 20 is operated.

  Further, since the air in the cleaning tank 2 to be discharged has a relative humidity of 100% or less, even when the air is exhausted into the housing 1, there is little adverse effect such as condensation. Although not shown in the drawing, a vent hole through which air flows outside the housing 1 may be provided on any wall surface other than the front surface of the housing 1. If it does so, while the possibility of dew condensation inside the housing | casing 1 is further suppressed, there exists a possibility that the air supplied to the washing tank 2 can be made into low temperature low humidity.

  As described above, the dishwasher of the present invention is provided with the supply air passage 12, the exhaust air passage 16, and the communication air passage 19 communicating these air passages in the washing tub 2, and the exhaust air passage 16 outside the tank. The exhaust port 18 is provided in the housing 1, a dehumidifying unit 20 is provided in the communication air channel 19, a damper is provided in each air channel, and the control unit 11 is provided with each air channel during the operation of the drying process. By adjusting the three dampers provided in the circulator and operating the blower 13, a circulation operation in which the cleaning tank 2 and the communication air passage 19 form a circulation path and no supply / exhaust is performed, and the circulation path is limited. Thus, the air supply / exhaust operation for supplying and exhausting air is switched.

  With this configuration, when the dehumidification is performed by the circulation operation in the drying process and the efficiency of drying by the dehumidifying unit 20 has been reduced, the air in the cleaning tank 2 is discharged out of the tank by switching to the air supply / exhaust operation. Efficiency can be improved and drying time can be shortened. Further, since the air in the cleaning tank 2 to be discharged has a relative humidity of 100% or less, even when the air is exhausted into the housing 1, there is little adverse effect such as condensation. For this reason, it is not necessary to provide an exhaust port in the front door 3, and it has the outstanding design property which can attach the decorative board of a system kitchen to the whole door.

(Embodiment 2)
3A and 3B are side cross-sectional views of the dishwasher according to Embodiment 2 of the present invention, where FIG. 3A shows a circulation path state and FIG. 3B shows a supply / exhaust state. The difference from the first embodiment is that the first damper 22 and the third damper 24 are deleted, and a switching damper 26 having functions of these two dampers is provided in the exhaust side connection portion 16a instead. It is. That is, the switching damper 26 is provided in place of the two dampers in the first embodiment. Other configurations are the same as those described in the first embodiment.

In FIG. 3A, the switching damper 26 is provided in the exhaust side connection portion 16a. When the exhaust air passage 16 is closed, the communication air passage 19 is opened, and when the communication air passage 19 is closed, the exhaust air passage 16 is opened. It is configured. The control unit 11 closes the exhaust air passage 16 by the switching damper 26 to open the communication air passage 19, closes the second damper 23 and closes the air supply air passage 12, and does not supply or exhaust the cleaning tank 2. A circulation path is formed, and dehumidification can be performed by circulation operation.
In FIG. 3B, the control unit 11 closes the communication air passage 19 by the switching damper 26 to open the exhaust air passage 16, and opens the second damper 23 to open the air supply air passage 12. A supply / exhaust operation for supplying external air to the cleaning tank 2 can be performed.

  As described above, the switching damper 26 is configured so that the communication air passage 19 is opened when the exhaust air passage 16 is closed, and the exhaust air passage 16 is opened when the communication air passage 19 is closed. The air path can be switched by one damper, the number of dampers and the drive source of the damper is reduced, and a simple and highly reliable damper configuration is possible.

  With the above configuration, the dishwasher according to the present invention performs dehumidification by circulation operation in the drying process as in the first embodiment, and switches to the supply / exhaust operation when the drying efficiency by the dehumidifying unit 20 decreases. By discharging the air in the cleaning tank 2 to the outside of the tank, the drying efficiency can be improved and the drying time can be shortened. Further, since the air in the cleaning tank 2 to be discharged has a relative humidity of 100% or less, even if the air is exhausted into the housing 1, there is little adverse effect such as dew condensation. There is no need to provide it, and it is possible to have an excellent design that can attach the decorative panel of the system kitchen to the entire door.

(Embodiment 3)
4A and 4B are side cross-sectional views of the dishwasher according to Embodiment 3 of the present invention. FIG. 4A shows a circulation path state, and FIG. 4B shows a supply / exhaust state. The difference from the second embodiment is that the switching damper 26 and the second damper 23 are deleted, and a composite damper 27 having the functions of these two dampers is provided instead. That is, the composite damper 27 has the functions of the three dampers in the first embodiment, and is provided in place of these three dampers. Although the shapes of the supply air passage 28 and the exhaust air passage 29 are changed for the composite damper 27, other configurations are the same as those described in the second embodiment.

  In FIG. 4 (a), the exhaust air passage 29 is bent upward at the exhaust side connection portion 29a, and the air supply air passage 28 is adjacent to the exhaust side connection portion 29a at its damper installation location (here, the air supply port 30). Provided. The composite damper 27 is formed by integrating respective valve bodies corresponding to the switching damper 26 and the second damper 23 in the second embodiment with a predetermined angle around the rotation shaft 31. The predetermined angle between the valve bodies of the composite damper 27 corresponds to the angle between the closed surface of the supply air passage 28 and the closed surface of the exhaust air passage 29. The composite damper 27 closes the exhaust air passage 29 and simultaneously closes the air supply port 30 and closes the air supply air passage 28, thereby opening the communication air passage 19, and closing the communication air passage 19 closes the exhaust air passage 29. Is opened, and at the same time, the air supply port 30 is opened to open the air supply air passage 28. The air path in the vicinity of the composite damper 27 is formed so that the supply air path 28 is sufficiently opened when the composite damper 27 opens the exhaust air path 29 and closes the communication air path 19.

  In FIG. 4A, the control unit 11 closes the exhaust air passage 29 with the composite damper 27 and simultaneously closes the air supply port 30 to close the air supply air passage 28 and opens the communication air passage 19. Thus, a circulation path that does not supply and exhaust air is formed, and dehumidification can be performed by circulation operation. 4B, the control unit 11 closes the communication air passage 19 by the composite damper 27 to open the exhaust air passage 29, and simultaneously opens the air supply port 30 to open the air supply air passage 28. A supply / exhaust operation for supplying external air to the cleaning tank 2 can be performed.

  As described above, the composite damper 27 opens the communication air passage 19 when the supply air passage 28 and the exhaust air passage 29 are closed, and opens the supply air passage 28 and the exhaust air passage 29 when the communication air passage 19 is closed. The three air paths can be switched by one damper so as to be opened, and the damper and the drive source of the damper are further reduced, thereby enabling a simpler and more reliable damper configuration.

  With the above configuration, the dishwasher of the present invention performs the dehumidification by the circulation operation in the drying process as in the first and second embodiments, and when the drying efficiency by the dehumidifying unit 20 has decreased, the dishwasher / dryer is switched to the supply / exhaust operation By switching and exhausting the air in the cleaning tank 2 to the outside of the tank, the drying efficiency can be improved and the drying time can be shortened. Further, since the air in the cleaning tank 2 to be discharged has a relative humidity of 100% or less, even if the air is exhausted into the housing 1, there is little adverse effect such as dew condensation. There is no need to provide it, and excellent design can be maintained.

(Embodiment 4)
FIG. 5 is a side sectional view of the circulation path state of the dishwasher according to the fourth embodiment of the present invention. The difference from the first embodiment is that the exhaust air passage 34 is provided at the rear part of the cleaning tank 2 and is separated from the circulation path. An exhaust port 40 outside the tank of the exhaust air passage 34 is provided in the housing 1 and is opened to the outside of the cleaning tank 2. As for the circulation path, the communication air path 32 is directly connected to the outlet 38 of the cleaning tank 2 and is connected to the air supply side connection portion 33a, and the first damper 35 is provided. A second damper 36 is provided in the supply air passage 33, and a third damper 37 is provided in the exhaust air passage 34. Other configurations are the same as those described in the first embodiment.

  The functions of these three air passages and the three dampers are the same as those described in the first embodiment, and the control unit 11 is provided with the three air passages provided in the respective air passages during the operation of the drying process. By adjusting the damper and operating the blower 13, a circulation operation in which the cleaning tank 2 and the communication air passage 32 form a circulation path and no supply / exhaust is performed, and a supply / exhaust operation that restricts the circulation path and performs supply / exhaust It is configured to switch between exhaust operation. With this configuration, when the dehumidification is performed by the circulation operation in the drying process and the efficiency of drying by the dehumidifying unit 20 has been reduced, the air in the cleaning tank 2 is discharged out of the tank by switching to the air supply / exhaust operation. Efficiency can be improved and drying time can be shortened. Further, since the air in the cleaning tank 2 to be discharged has a relative humidity of 100% or less, there is little adverse effect such as dew condensation even when exhausted into the housing 1, so an exhaust port must be provided in the front door 3. There is no, and can maintain excellent design.

  Further, in the fourth embodiment, the exhaust air passage 34 and the tank exhaust port 39 are provided at a position separated from the air supply air passage 33 at the rear part of the cleaning tank 2. Accordingly, when the circulation operation is performed, the air convected in the cleaning tank 2 is led out from the outlet 38 at the front of the cleaning tank 2, but after switching to the air supply / exhaust operation, the tank exhaust 39 Is derived from With this configuration, when the circulation operation is switched to the supply / exhaust operation, the flow of air in the cleaning tank 2 changes, and there is no bias in the degree of progress of the drying of the cleaning object 4 in the cleaning tank 2, so that the cleaning object 4 is It can be dried throughout.

  As described above, the dishwasher according to the present invention includes the air supply passage 33 and the exhaust air passage 34 in the washing tub 2, and the communication air passage 32 that communicates the washing tub 2 and the air supply air passage 33. The outside air outlet 40 of the air passage 34 is provided in the housing 1, the dehumidifying unit 20 is provided in the communication air passage 32, a damper is provided in each air passage, and the control unit 11 operates in the drying process. A circulation operation in which a circulation path is formed between the cleaning tank 2 and the communication air path 32 and no air supply / exhaust is performed by adjusting the three dampers provided in the respective air paths and operating the blower 13. In addition, it is configured to perform switching between a supply / exhaust operation for supplying and exhausting air while restricting the circulation path.

With this configuration, when the dehumidification is performed by the circulation operation in the drying process and the efficiency of drying by the dehumidifying unit 20 has been reduced, the air in the cleaning tank 2 is discharged out of the tank by switching to the air supply / exhaust operation. Efficiency can be improved. Further, since the air in the cleaning tank 2 to be discharged has a relative humidity of 100% or less, even if the air is exhausted into the housing 1, there is little adverse effect such as dew condensation. There is no need to provide it, and excellent design can be maintained. Further, when the operation is switched from the circulation operation to the air supply / exhaust operation, the flow of air in the cleaning tank 2 changes, and there is no bias in the degree of progress of drying of the object 4 to be cleaned in the cleaning tank 2, so Can be dried.

  The dishwasher according to the present invention maintains high design by discharging the air in the tank to the outside of the tank by switching the air path when the efficiency of drying by the dehumidifying unit has decreased in the drying process. It is possible to improve the efficiency of drying in the tank as it is, and it can be applied not only to a dish dryer or a drawer type but also to a built-in type dishwasher and dryer of the front open type.

DESCRIPTION OF SYMBOLS 1 Case 2 Cleaning tank 3 Door 4 Object to be cleaned 5 Tableware basket 6 Water supply valve 7 Cleaning nozzle 8 Cleaning pump 9 Heating part 10 Temperature sensor 11 Control part 12 Supply air path 12a Supply side connection part 13 Blower part 14 Supply port DESCRIPTION OF SYMBOLS 15 Air outlet 16 Exhaust air path 16a Exhaust side connection part 17 In-tank exhaust port 18 Outer tank outlet 19 Communication air path 20 Dehumidification part 21 Temperature / humidity sensor 22 1st damper 23 2nd damper 24 3rd damper 25 Drainage Pipe 26 Switching damper 27 Composite damper 28 Air supply air passage 29 Exhaust air passage 29a Exhaust air side connection portion 30 Air supply port 31 Rotating shaft 32 Communication air passage 33 Supply air air passage 33a Air supply side connection portion 34 Exhaust air passage 35 First damper 36 2nd damper 37 3rd damper 38 Outlet 39 Outlet in tank 40 Outlet in tank

Claims (4)

A cleaning tank in which an object to be cleaned is accommodated in a housing, a cleaning nozzle for injecting cleaning water in the cleaning tank, a cleaning pump for supplying water to the cleaning nozzle under pressure, and heating for heating the cleaning water And a control unit that controls a series of operations of the cleaning process, the rinsing process, and the drying process, the air supply air passage that introduces air outside the cleaning tank into the cleaning tank, and the cleaning tank An exhaust air passage for discharging air out of the cleaning tank; a communication air passage communicating the supply air side connection portion of the supply air passage and the exhaust air side connection portion of the exhaust air passage; A dehumidifying part for dehumidifying the air passing through the communication air path; a ventilation part in the air supply air path between the air supply side connection part and the cleaning tank; and the dehumidification part and the exhaust side connection The first damper is connected to the communication air passage between the air supply portion and the air supply air passage outside the cleaning tank from the air supply side connection portion. And a third damper in the exhaust air passage outside the cleaning tank from the exhaust side connecting portion to which the exhaust air passage and the communication air passage are connected, and the exhaust outlet of the exhaust air passage is the The controller is provided in a housing, and the control unit adjusts the three dampers during operation of the drying process to operate the air blowing unit, thereby forming a circulation path between the cleaning tank and the communication air path. A dishwasher configured to switch between a circulation operation in which no air supply / exhaust is performed and a supply / exhaust operation in which the circulation path is limited to supply and exhaust air. Instead of the first damper and the third damper, a switching damper is provided in the exhaust-side connecting portion, and the switching damper opens the exhaust air path when the communication air path is closed, and the exhaust wind The dishwasher according to claim 1, wherein the communication air passage is opened when the road is closed. Instead of the first damper, the second damper, and the third damper, a composite damper is provided in the exhaust-side connection portion, and a damper installation location of the supply air path is adjacent to the exhaust-side connection portion. The composite damper is formed by integrating a valve body on the exhaust side connection portion side and a valve body on the air supply air passage side at a predetermined angle around a rotation axis, and the composite damper includes The exhaust air passage and the air supply air passage are closed when the communication air passage is opened, and the exhaust air passage and the air supply air passage are opened when the communication air passage is closed. Dishwasher as described in. A cleaning tank in which an object to be cleaned is accommodated in a housing, a cleaning nozzle for injecting cleaning water in the cleaning tank, a cleaning pump for supplying water to the cleaning nozzle under pressure, and heating for heating the cleaning water And a control unit that controls a series of operations of the cleaning process, the rinsing process, and the drying process, the air supply air passage that introduces air outside the cleaning tank into the cleaning tank, and the cleaning tank An exhaust air passage that discharges air to the outside of the cleaning tank, a communication air passage that communicates the supply side connection portion of the air supply air path and the cleaning tank, and dehumidifies the air that passes through the communication air path A dehumidifying part, a blower part in the air supply air path between the air supply side connection part and the cleaning tank, and a communication air path between the dehumidification part and the exhaust side connection part. 1 damper, a second damper in the air supply air passage outside the tank from the air supply side connection, and a third damper in the exhaust air passage. An exhaust outlet of the exhaust air passage is provided in the housing, and the control unit adjusts the three dampers during operation of the drying step to operate the air blowing unit, A dishwasher configured to perform a circulation operation that does not supply and exhaust air to the washing tank and a supply and exhaust operation that supplies and exhausts air.

Images