JPH059456U - Dishwasher - Google Patents

Abstract

(57) [Summary] [Purpose] The risk of burns due to the heater for drying can be eliminated, and insulation deterioration and rusting around the heater due to the reverse flow of water vapor into the duct can be prevented. [Structure] A duct 21 is provided for communicating the outside of the main body 11 with the inside of the cleaning tank 12, and a fan device 24 is provided in this duct 21.
And a heater 31 for drying. When performing the drying process,
The fan device 24 and the drying heater 31 are operated to supply warm air into the cleaning tank 12. Further, even when the cleaning / rinsing process is executed, by operating the fan device 24,
An air flow is generated in the duct 21 toward the cleaning tank 12. This prevents water vapor from entering the duct 21 during the same process.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dishwasher for washing dishes by spraying warm water on the dishes in a washing tank.

[0002]

[Prior Art]

 As this kind of dishwasher, for example, the one having the configuration shown in FIG. 5 is provided. This has a cleaning tank 2 arranged in a main body 1 and tableware 3 can be stored therein, and a rotary cleaning nozzle 4 and a sheath heater 5 are arranged at the bottom of the cleaning tank 2. There is. On the other hand, a fan device 6 and a duct 7 are provided at the back of the main body 1, and the intake side of the duct 7 is opened at the back surface of the main body 1, and the discharge side is opened at the lower part of the cleaning tank 2.

In the above configuration, when the cleaning / rinsing process is executed, warm water up to the liquid level L is stored in the cleaning tank 2 and heated by the sheath heater 5. Then, this is sucked by the washing pump 8 and circulated while being sprayed from the washing nozzle 4 to the dishes. Further, when the drying process of drying the washed dishes is performed, after draining the inside of the cleaning tank 2, the fan device 6 is operated while energizing the sheath heater 5 to let outside air pass through the duct 7 into the cleaning tank 2. Blow in. As a result, the blown outside air is warmed to dry the dishes and is discharged out of the machine through the exhaust hole 9 formed in the ceiling of the cleaning tank 2.

[0004]

[Problems to be solved by the device]

 However, the dishwasher having the above structure has the following drawbacks.

Since the sheathed heater 5 also serves as a heater for drying and is energized during the drying process, the sheathed heater 5 has a considerably high temperature immediately after the completion of drying. Therefore, if the user inserts his or her hand to pick up a spoon or the like that has fallen to the inner bottom of the cleaning tank, there is a risk of touching the heater 5 and getting burned.

In order to solve such a problem, it is considered that a heater dedicated to drying is provided in the duct 7 and the heater is energized to blow warm air into the cleaning tank 2 during the drying operation. However, with this configuration, the following problems will occur this time.

When the cleaning / rinsing process is executed, warm water is sprayed from the cleaning nozzle 4, so that the cleaning tank 2 is filled with water vapor. For this reason, the water vapor enters the duct 7 through the discharge port 7b of the duct 7 and flows back, and dew is condensed inside the duct 7 and around the heater. If this happens, rust may be generated in the duct 7 or the electrical insulation around the heater may be deteriorated.

In order to deal with this, a configuration in which a damper is provided in the duct 7 and the damper is closed during the cleaning / rinsing process and opened during the drying process is also conceivable. However, when the damper is provided in this way, the opening / closing mechanism becomes complicated, and the opening / closing operation is not smoothly performed due to the adhesion of dirt to the damper.

The present invention has been made in view of the above circumstances, and therefore an object thereof is to eliminate the risk of burns due to a heater for drying, and yet to provide a heater around a heater due to reverse flow of water vapor into a duct. The purpose of the present invention is to provide a dishwasher that can prevent insulation deterioration and rusting and has a simple structure.

[0010]

[Means for Solving the Problems]

 The dishwasher of the present invention includes a washing tank provided in the main body for accommodating dishes, a washing mechanism for spraying hot water stored in the washing tank onto the dishes for washing, and an external portion of the main body. A duct for communicating the inside of the cleaning tank with the inside of the cleaning tank; a fan device for supplying outside air into the cleaning tank through this duct; and a heater installed in the middle of the duct to heat the air supplied into the cleaning tank. A control device for controlling the cleaning mechanism and the fan device to sequentially execute the cleaning / rinsing process and the drying process.The control device operates the fan device and the heater during the drying process. The feature is that hot air is supplied to the cleaning tank and the fan device is operated to generate an air flow toward the cleaning tank in the duct even during the cleaning / rinsing process.

[0011]

[Action]

 During the washing and rinsing process, hot water stored in the washing tank is sprayed onto the dishes by the washing mechanism. Further, in the drying process, the heater and the fan device are operated to supply hot air into the cleaning tank, so that the washed dishes are dried.

When the cleaning / rinsing process is executed, the cleaning tank is filled with water vapor, but the fan device is also activated at this time, so that an airflow toward the cleaning tank is generated in the duct. It This reliably prevents the water vapor in the cleaning tank from flowing back to the heater side in the duct.

[0013]

[Effect of the device]

 As described above, according to the dishwasher of the present invention, since the heater dedicated to drying is provided in the middle of the duct, unlike the configuration in which the sheathed heater at the inner bottom of the washing tank is energized for drying as well, burns Danger can be avoided. Moreover, even though the duct is equipped with a heater, the air flow to the cleaning tank is generated in the duct even during the cleaning / rinsing process, so that water vapor enters the duct and rusts in the duct. It is also possible to prevent the generation of heat and the deterioration of the insulation around the heater. Further, since the backflow of water vapor is prevented by using a drying fan device, the structure is simplified.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

A cleaning tank 12 is provided inside the main body 11, and a front opening of the cleaning tank 12 is opened and closed by a door 13. A liquid reservoir recess 12a is formed at the bottom of the cleaning tank 12, and the suction port of the cleaning pump 15 driven by the pump motor 14 is connected to this. The discharge port of the cleaning pump 15 communicates with a known rotary cleaning nozzle 16 provided on the inner bottom of the cleaning tank 12, whereby hot water sucked from the liquid reservoir recess 12 a is discharged from the cleaning nozzle 16. A cleaning mechanism 17 for spraying to wash the dishes in the cleaning tank 12 is configured.

Further, a duct 21 is provided from the upper front part of the main body 11 to the back part of the cleaning tank 12, whereby the outside of the main body 11 and the inside of the cleaning tank 12 are communicated with each other. A casing portion 21a is formed in an upper part of the back of the cleaning tank 12 in the duct 21, and a centrifugal fan 22 is provided in the inside thereof, and a fan motor 23 for driving the fan 22 is attached to the casing portion 21a. Thus, a fan device 24 for supplying outside air into the cleaning tank 12 through the duct 21 is configured. As shown in FIG. 2, the suction side end of the duct 21 is opened as an intake port 26 at the uppermost front surface of the main body 11, and the discharge side end is opened as a discharge port 25 in the lower portion of the cleaning tank 12. ing. The opening height position of the discharge port 25 is higher than the liquid level of the cleaning liquid (indicated by the symbol WL in FIG. 1) at the time of dishwashing.

A lower portion of the fan device 24 in the duct 21 is formed to have a large diameter, and a drying heater 31 is attached to the inside thereof. The drying heater 31 is a positive temperature coefficient thermistor made of a barium titanate-based ceramic semiconductor resistor in this embodiment. An exhaust port 32 is formed near the front surface of the ceiling of the cleaning tank 12, and an exhaust duct (not shown) is connected to the exhaust port 32, and its tip is connected to the exhaust grill 33 on the front surface of the main body 11.

On the other hand, the control device 40 for controlling the electrical components such as the pump motor 14 and the heater 31 for drying described above operates so as to sequentially execute the cleaning / rinsing process and the drying process, and is therefore shown in FIG. There is. Here, the door switch 41 detects opening of the door 13, and when the opening of the door 13 is detected by this, the control device 40 immediately stops the operation of the pump motor 14. The water supply valve 42 is connected to a water heater or a water tap (not shown) outside the machine to control the water supply to the cleaning tank 12. The water supply valve 42 is switched to rinsing at the beginning of the cleaning / rinsing process and during the process. It is opened at the beginning of the operation and hot water from the water heater or fresh water from the tap is supplied into the cleaning tank 12 until the water level switch 43 detects that the water level has reached a predetermined level. The drainage pump 44 is provided for discharging the dirty water in the cleaning tank 12 to the outside of the machine, and is operated by the control device 40 when the cleaning is completed during the cleaning / rinsing process and at the end of the cleaning process. To be rolled. The warm water heater 45 is provided, for example, at the outer bottom of the cleaning tank 12, and is energized when low-temperature fresh water is supplied into the cleaning tank 12, so that the fresh water stored in the cleaning tank 12 becomes warm. To be done.

Next, the operation of the dishwasher of this embodiment will be described.

The dishes are stored in the washing tank 12, the door 13 is closed, and the washing / rinsing process is started. Then, the water supply valve 42 is opened, and hot water is supplied from the water heater outside the machine to the predetermined liquid level WL in the cleaning tank 12, and mixed with the previously introduced detergent to form a warm cleaning liquid. Stored in the inner bottom. Then, since the pump motor 14 is energized next, the cleaning pump 15 sucks the cleaning liquid in the cleaning tank 12 and jets it from the cleaning nozzle 16 in a shower shape. The sprayed cleaning liquid removes the dirt adhering to the dishes and again accumulates at the bottom of the cleaning tank 12, so that this is sucked again by the cleaning pump 15, and the dishes are cleaned while the cleaning liquid is circulated. Then, when a predetermined time has elapsed from the start of the same process, the pump motor 14 is stopped, the drainage pump 44 is operated, and the dirty cleaning liquid in the cleaning tank 12 is discharged. After the drainage, hot water is again supplied into the washing tank 12, the washing pump 15 is energized to perform rinsing, and then the drainage pump 44 is operated to drain the washing tank 12.

During the cleaning / rinsing process, the fan motor 23 is also energized as shown in FIG. 4, and as a result, the outside air is sucked through the duct 21 and the inside of the cleaning tank 12 is sucked into the duct 21. An air flow directed to the cleaning tank 12 is generated, and the air is blown into the cleaning tank 12 from the outlet 25 as shown by the arrow in FIG.

When the cleaning / rinsing process is completed, the process proceeds to the drying process, and the heater 31 for drying and the fan motor 23 are energized. As a result, outside air is sucked into the duct 21, warmed by the drying heater 31 while passing through the duct 21, and blown into the washing tank 12 through the discharge port 25, so that the dishes in the washing tank 12 are quickly dried. Be done. The warm exhaust air containing moisture is exhausted to the outside from the exhaust port 32 located at the ceiling of the cleaning tank 12.

As described above, the dishwasher of this embodiment has the following advantages over the conventional configuration shown in FIG.

In the configuration of FIG. 5, since the sheathed heater 5 that is energized during the drying process is exposed, the user should pick up the spoon or the like that has fallen to the inner bottom of the cleaning tank 2 immediately after the completion of the drying process. However, since the drying heater 31 is not exposed in the cleaning tank 12, there is no danger of being burned.

With the configuration in which the drying heater 31 is provided in the middle of the duct 21 as in this embodiment, water vapor generated from hot water or the like may flow back into the duct 21 during the cleaning / rinsing process. If such a situation is repeated, dew condensation will occur on the inner wall of the duct 21 and around the drying heater 31, which will cause rust in the duct 21, and the insulation around the drying heater 31 will deteriorate, resulting in electrical depletion. It is expected that a mechanical failure will occur. In this respect, in the present embodiment, the fan device 24 is operated even during the cleaning / rinsing process, so that an airflow toward the cleaning tank 12 is generated in the duct 21 and the cleaning tank 12 is operated. Backflow of water vapor into the duct 21 is reliably prevented. As a result, the occurrence of defects due to rusting of the duct 21 and deterioration of insulation around the drying heater 31 can be prevented for a long period of time.

Moreover, the structure for preventing the backflow of water vapor is essentially simple in structure and reliable because the fan device 24 originally provided for drying only needs to be operated in the washing / rinsing process. The cost is high, and sufficient effects can be obtained without increasing costs.

The present invention is not limited to the embodiment described above and shown in the drawings. For example, when the cleaning / rinsing process is performed, the fan motor 23 is operated at a lower speed than the drying process, or the cleaning / rinsing process is performed. Even during the execution of the process, the drying heater 31 may be energized, and various changes may be made without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a block diagram showing an electrical configuration.

[Figure 4] Time chart

FIG. 5 is a vertical sectional side view showing a conventional dishwasher.

[Explanation of symbols]

 11 ... Main body 12 ... Washing tank 15 ... Washing pump 17 ... Washing mechanism 21 ... Duct 24 ... Fan device 31 ... Drying heater 40 ... Control device

Claims (1)

[Claims for utility model registration] [Claim 1] A washing tank provided in the main body for accommodating dishes, and a washing mechanism for injecting hot water stored in the washing tank onto the dishes for washing. A duct for communicating the outside of the main body with the inside of the cleaning tank, a fan device for supplying the outside air into the cleaning tank through the duct, and a duct provided at an intermediate portion of the duct and supplied into the cleaning tank. A heater that heats the air to be heated, and a control device that controls the cleaning mechanism, the fan device, and the like to sequentially execute a cleaning / rinsing process and a drying process, and the controller is configured to perform the fan when the drying process is performed. The device and the heater are operated to supply hot air into the cleaning tank, and the fan device is operated during the cleaning / rinsing process so that the air is blown into the cleaning tank. Dishwasher, characterized in that the arrangement for generating the flow.