JP2003047583A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dishwasher for properly cooling high temperature water which is used for washing and rinsing. SOLUTION: When high temperature rinsing is ended, a blow fan 21 is intermittently driven while continuing the washing operation of a washing and draining pump 17, blowing is performed into a washing chamber 2 and high temperature water is exposed to the outer air and high temperature steam from the washing chamber 2 is gradually discharged so that high temperature water is cooled. When a first cool-down is set, the blow fan 21 and the washing and draining pump 17 are stopped when five minutes passes after a blowing start. Then the temperature of hot water is reduced to be about 65 deg.C. When a second cool-down is set, the blow fan 21 and the washing and draining pump 17 are stopped when 14 minutes passes after the blowing start. The temperature of hot water is reduced to be about 60 deg.C.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a dishwasher.

[0002]

2. Description of the Related Art Conventionally, in a dishwasher, in the final rinsing in a plurality of rinses, hot water (for example, water of about 80 ° C.) generated by heating with a heater is sprayed onto the dishes to rinse the dishes, so-called high temperature rinsing (hot water). I try to do a rinse. This will disinfect the dishes,
Makes it easy to dry the dishes.

Conventionally, warm water of about 60 ° C. (warm water heated to about 60 ° C.) is conventionally used for washing, but in order to remove well the rice and oil stains stuck to the dishes, hotter water (for example, Washing with 80 ° C. water) is also conceivable.

By the way, in a dishwasher in which the drainage hose of the equipment is directly connected to the drainage pipe of the house (including the drainage pipe of the sink) like the so-called built-in type incorporated in the sink (system kitchen), When the high-temperature water as described above is drained, there is a risk that the drainage pipe, which does not have a high heat resistant temperature, may be thermally damaged. Therefore, in such a dishwasher, there is a dishwasher in which high-temperature water is cooled and then the high-temperature water is cooled and then drained to the outside of the machine. And
The applicant of the present invention has disclosed a dishwasher in which the cold water is cooled by supplying cold water into the washing tank after rinsing at high temperature.
Japanese Patent Laid-Open No. 6-327609 proposes a dishwasher in which cold air is supplied into the washing tank after high-temperature rinsing to cool high-temperature water.

[0005]

There are several types (materials) of drainage pipes of houses to which the drainage hoses of equipment are connected, and the heat resistant temperatures are different. In addition, the length of the drain hose of the equipment will change depending on the installation conditions. For this reason, the degree of cooling required to prevent the drain pipe from being thermally damaged varies depending on the installation state of the dishwasher.

[0006] As in the prior art, in the case where the same cooling operation is always performed, it is necessary to assume a bad condition and perform sufficient cooling so that there is no fear of thermal damage even in this case. Under favorable conditions such as a relatively high heat resistant temperature of the pipe, it will be cooled more than necessary, so there is a problem that water will be wasted when cooling with operating time, electricity bills, and water. It was

The present invention has been made to solve the above problems, and an object of the present invention is to provide a dishwasher for appropriately cooling high temperature water used for washing and rinsing.

[0008]

Means for Solving the Problems and Effects of the Invention The dishwasher according to the first invention of the present application for solving the above-mentioned problems uses high-temperature water for washing and rinsing dishes, and was used for this washing and rinsing. In a dishwasher that cools high-temperature water and then drains it out of the machine, it is possible to execute multiple cooling operations with different temperatures reached by cooling and to select a specific cooling operation from multiple cooling operations. It is characterized by including a selecting means, and cooling the high-temperature water by executing the cooling operation selected by the selecting means after the washing and rinsing.

For example, the cooling operation cools high-temperature water by blowing air, and the blowing time is changed to change the cooling capacity, and the temperature reached by cooling is changed. At this time, the longer the air blowing time, the higher the cooling capacity and the lower the temperature to reach. Further, the cooling operation is to cool high-temperature water by supplying water, and by changing the amount of supplied water, the cooling capacity is changed and the temperature reached by cooling is changed. At this time, the larger the amount of water supplied, the larger the cooling capacity, and the lower the temperature reached.

Due to the different cooling capacities, a plurality of cooling operations having different temperatures reached by cooling (cooling temperatures) can be selected. For example, when installing a dishwasher, the installer selects the cooling operation according to the installation conditions such as the heat resistant temperature of the drain pipe to which the drain hose is connected. That is, if it is not necessary to make the temperature too low due to the high heat resistance of the drain pipe, etc., a cooling operation in which the cooling temperature is not too low is selected, and the low temperature is set due to the low heat resistance of the drain pipe. If necessary, the cooling operation with the lower cooling temperature is selected.

Thus, in the washing operation, the dishes are easily washed (high temperature rinse) with high temperature water exceeding the heat resistant temperature of the drainage pipe. Upon completion of such washing and rinsing with high temperature water, the selected cooling operation is executed. As a result, the high temperature water is lowered to a temperature lower than the heat resistant temperature at least when it reaches the drainage pipe.

A cooling operation with a lower cooling temperature requires a higher cooling capacity and a larger amount of energy. Therefore, much time, power, water, etc. are spent on the cooling operation.
In the dishwasher according to the first aspect of the present invention, the cooling operation can be selected according to the heat-resistant temperature of the drainage pipe, so that it is possible to prevent the cooling operation from being performed more than necessary, and while reliably preventing heat damage to the drainage pipe, Unnecessary increase in operating time, electricity bill, and water volume can be prevented.

In the dishwasher according to the first invention,
Further, it is desirable that a specific cooling operation can be selected by using an operation key for performing the cleaning operation as the selecting means and performing a special operation different from the operation for the cleaning operation.

According to the above construction, since the operation keys for performing the cleaning operation are used, it is possible to prevent the operation section from becoming complicated without increasing the number of extra keys, and the special operation is required. It is unlikely that the user will accidentally change the settings.

A dishwasher according to a second invention of the present application which solves the above-mentioned problems performs washing and rinsing of dishes with high temperature water, and after this rinsing and washing, a cooling operation for lowering the temperature of the high temperature water is performed. In a dishwasher that cools high-temperature water and then drains it out of the machine, a setting means for setting whether or not to perform the cooling operation is provided, and when the setting not to perform the cooling operation is made by this setting means, After the washing and rinsing, the high temperature water is drained to the outside without cooling, and when the cooling operation is set by the setting means, after the rinsing and rinsing, the high temperature water is cooled and then out of the machine. It is characterized by draining to.

In this configuration, the cooling operation is set not to be performed when it is not necessary to cool the high-temperature water such as when the drain pipe has a sufficiently high heat resistance temperature. In this way, after washing and rinsing with high-temperature water is completed, the high-temperature water is discharged as it is to the outside of the machine, that is, to the drain pipe without performing the cooling operation.

According to the dishwasher of the second aspect of the present invention, the cooling operation can be omitted when the cooling of the high temperature water is not necessary, so that the drainage pipe can be reliably prevented from being damaged by heat, and the operating time and the electricity bill can be reduced. It is possible to prevent unnecessary increase of water volume.

[0018]

DETAILED DESCRIPTION OF THE INVENTION A dishwasher according to an embodiment of the present invention will be described below with reference to the drawings. First, the overall configuration of the dishwasher of the present embodiment will be described with reference to FIGS. FIG. 1 is a front view showing a state in which the present dishwasher is attached to a system kitchen, and FIG. 2 is a side view of the same.

This dishwasher is a built-in type,
It is placed on the table 81 and housed in the housing space of the system kitchen 80. The drain hose 30 discharged from the dishwasher main body is directly connected to a drain pipe 82 of a house arranged in the lower rear part of the system kitchen 80, for example, as shown in FIG. Such an installation form is found in apartment houses and other collective housing. In such an apartment, a drain pipe made of vinyl chloride (for example, a VP pipe of JIS standard) is generally used as the drain pipe 82, and the heat resistant temperature thereof is 60 ° C. Of course, the installation form is not limited to the above. For example, in a detached house, a drain hose may be connected in the middle of the drain pipe of a system kitchen using a branch pipe or the like.

3 and 4 are schematic vertical sectional views showing the overall construction of the dishwasher. FIG. 3 shows a state where the washing cabinet is completely housed in the housing, and FIG. 4 is a state where the washing cabinet is pulled out from the housing. Is the state of.

A washing cabinet 2 having an upper surface opening 3 is provided inside a casing 1 having an opening on the front side, and a dish basket 4 for arranging dishes in a line is provided inside the washing cabinet 2. .
An upper lid 5 for closing the upper opening 3 of the washing cabinet 2 is arranged in the upper space of the housing 1 so as to be vertically movable by a pair of left and right parallel link mechanisms including a pair of front and rear links 6, 6 '. There is. A front panel 7 that doubles as a door that closes the front opening of the casing 1 is detachably attached to the front wall 2a of the washing cabinet 2, and the front panel 7 and the washing cabinet 2 are integrated into the casing 1. It can be pulled out forward along the guide rails 8 which are installed substantially horizontally inside the both side walls.

The upper portion of the front panel 7 has a sloped portion 7a protruding like an eaves, and the sloped portion 7a is provided with an operation panel 9 equipped with various operation keys and a display. The lower side of the inclined surface portion 7a is formed into a grip portion 10 that is recessed inward, and the grip portion 10 is provided with an operation lever 11 that is rotatable in the left-right direction. The lateral movement of the operating lever 11 causes the front wall 2a of the washing cabinet 2 and the front panel 7 to rotate.
Interlocking with the latch bar 12 protruding upward between and, and interlocking with the operation of the operation lever 11 by the user to prevent (that is, latch) the pulling-out operation of the washing cabinet 2 or cancel the obstruction. You can do it.

In this dishwasher, in addition to the operation of the operating lever 11, the latch bar 12 and the upper lid 5 are moved up and down, that is, the upper opening 3 of the washing cabinet 2 is closed / opened. There is. That is, as shown in FIG. 3, when the operating lever 11 is rotated in the latching direction in a state where the cleaning cabinet 2 is completely stored in the housing 1, the latch bar 12 rotates and the cleaning cabinet 2 cannot be pulled out. While being locked in the state (locked state), the upper lid 5 descends and comes into close contact with the upper surface of the cleaning cabinet 2 to close the upper surface opening 3. On the other hand, when the user rotates the operation lever 11 in the latch release direction, the upper lid 5 rises and is not in contact with the upper surface opening 3 of the washing cabinet 2 as shown in FIG. 4, and the latch bar 12 is also locked. Since it is released, the washing cabinet 2 can be freely drawn out from the inside of the housing 1.

An extendable water supply hose 13 equipped with a water supply valve (not shown) is connected to the rear of the washing cabinet 2,
When the water supply valve is opened, water supplied from an external tap or the like is poured into the washing chamber 2 through the water supply hose 13. A large recessed water storage tank 14 is arranged in communication with the bottom surface of the front of the cleaning cabinet 2, and the water poured into the cleaning cabinet 2 is stored in the storage tank 1.
It flows into 4 and is stored. On the upper part of the water tank 14, a mesh-shaped filter 15 is detachably provided for collecting food residues that run off the dishes when washing the dishes. A rotatable nozzle arm 16 having a plurality of water ejection holes formed on the upper surface is provided at the center of the bottom of the cleaning cabinet 2, and a cleaning / drainage pump 17 is disposed below the bottom surface of the cleaning cabinet 2. The cleaning / drainage pump 17 includes a motor that can be driven to rotate in both rotation directions. When the motor rotates in the normal direction, the cleaning / drainage pump 17 functions as a cleaning pump, and when it rotates in the reverse direction, it functions as a drainage pump. To do. An air passage 20 is formed at the bottom of the washing cabinet 2 by the bottom surface of the washing cabinet 2 and the air duct cover 19.
The heater 18 is arranged in the zero position. The air passage cover 19 is appropriately provided with a water passage hole (not shown) having a shape that allows water to flow in and out but does not leak air blown from a blower unit described later.

As shown in FIG. 1, when the washing cabinet 2 is completely housed in the housing 1 and the washing operation and the rinsing operation are performed, the water supply valve (not shown) is opened to supply the water supply hose 1.
Water is supplied into the washing cabinet 2 through 3. The water supplied into the cleaning cabinet 2 collects at the bottom of the cleaning cabinet 2 including the water storage tank 14. The stored water is stored in the bottom of the washing chamber 2 by the heater 1
Heated moderately by 8. When the cleaning / drainage pump 17 is driven as a cleaning pump in this state, the hot water sucked from the water storage tank 14 is pressure-fed to the nozzle arm 16 and sprayed into the cleaning chamber 2 through the water ejection holes. The nozzle arm 16 rotates due to the momentum of this injection. As a result, the tableware stored in the tableware basket 4 is sprayed with water and the dirt is removed. The food residue attached to the tableware is collected by the filter 15, and the water flows into the water storage tank 14 and is circulated and used again. When the washing operation and the rinsing operation are finished and the washing pump 17 is driven as the drainage pump, the water at the bottom of the washing cabinet 2 passes through the drainage hose 30 to the outside of the machine, namely, the drainage pipe 8 of the house.
It is discharged to 2.

Between the front wall 2a of the washing cabinet 2 and the front panel 7, a blowing means 22 including a blowing fan 21 and an exhaust means 23.
And are provided. The air blower 22 is connected to the air blow passage 20, and outside air is supplied from the air blower 22 into the air blow passage 20 during the drying process, and the outside air is heated by the heater 18 and blown into the cleaning chamber 2 through the air blow port 20a. .
Then, when the tableware is hit, the air containing the steam generated from the tableware is discharged to the outside of the machine by the exhaust means 23.

As shown in FIG. 1, the operation panel 9 has a power switch 24, a start key 25, and an operation key as operation keys.
A koskey 26 and a reservation key 27 are provided. A course display unit 28 and a segment display unit 29 are provided as display devices. The Koskey 26 is "standard"
This is a key for selecting a desired course from five washing operation courses of "speedy", "high temperature 80 ° C", "steam", and "reservation". The reservation key 27 is a key for setting a reservation time. The course display unit 28 includes LEDs provided corresponding to each course, and turns on the LED of the course selected by the course key 26. Segment display 2
9 displays various information such as remaining time of cleaning operation and error information in numbers or alphabets. The start key 25 also serves as a temporary stop key. When the start key 25 is pressed during a driving operation, the operation is temporarily interrupted, and when the start key 25 is pressed again from that state, the operation is interrupted first. Resume operation from the point where it continued.

FIG. 5 is an electric system configuration diagram of a main portion of the present dishwasher. The control unit 31 is mainly composed of a microcomputer including a CPU, a ROM, a RAM, a timer, and the like, and the ROM stores a control program for performing an operation described later. The functions described below are achieved by the CPU executing various calculations and processes in accordance with this control program. The control unit 31 includes the power switch 24, the start key 25, the course key 26, and the reservation key 2.
7, a detection switch 32 for detecting the locked state of the washing cabinet 2 by the latch lever 12, a temperature sensor 33 for detecting the water temperature in the washing cabinet 2,
A detection signal is adapted to be input from a water level sensor 34 or the like that detects the cleaning water level for performing easy washing and rinsing. In addition, the control unit 31 includes a non-volatile memory E
The EPROM 35 is connected. The control unit 31 causes the segment display unit 29 to perform a predetermined display, and controls the LED of the course display unit 28 to light. Also,
The buzzer 36 is rung as needed. Furthermore, the control unit 3
1 controls the operations of the water supply valve 38, the cleaning / drainage pump 17, the heater 18, and the blower fan 21 via the load drive unit 37.

Now, the washing operation of the dishwasher based on the above construction will be described with reference to the flow chart of FIG.

When the power switch 24 is turned on and the power of the dishwasher main body is turned on, the operation control by the control unit 31 is started. First, it is determined whether or not an operation for entering a setting mode in which water / hot water setting and cool down setting are performed simultaneously, here, a special operation of pressing the reservation key 27 three times while pressing the course key 26 ( Step S1). The water supply / hot water supply setting is for setting whether the dishwasher is supplied with hot water from the water heater or water from a tap. The cool down setting is whether or not to perform cool down (cooling operation) to cool the high temperature water used for high temperature rinsing (heating rinsing) described below before draining,
If it does, it sets how much cooldown to do.

When the present dishwasher is installed in the system kitchen 80, the installer performs a special operation to set water / hot water and cool down according to the installation situation.

If it is determined in step S1 that the setting mode has been operated, the setting mode is entered. In the setting mode, first, the current setting value (initial setting value for the first time) is displayed on the segment display unit 29 (step S).
2). In this dishwasher, "hot water setting, cool down 6
5 ° C setting ”(Setting A),“ Hot water supply setting, Cooldown 60
℃ setting ”(setting B),“ hot water supply setting, no cool down ”
(Setting C), "Water supply setting, cooldown 65 ° C setting"
(Setting D), "Water supply setting, cool down 60 ° C setting"
There are six setting patterns (setting E), “water supply setting, no cool down” (setting F). here,
Cooldown 65 ℃ setting means that the water temperature in the washing cabinet 2 is 65 ℃.
It is set to cool down to about ℃ (hereinafter referred to as the first cool down), cool down 60 ℃
The setting is a setting for performing a cooldown (hereinafter referred to as a second cooldown) for lowering the water temperature in the cleaning cabinet 2 to about 60 ° C.

In step S2, for example, setting A is displayed as an initial setting value. Next, when the feeding operation is performed by pressing the course key 26, the next set value is displayed on the segment display section 29 (steps S3 and S).
4). For example, if the setting A is initially set, the setting B is displayed. Every time a feeding operation is performed, setting C → setting D → setting E
→ The setting F is displayed, and after the setting F, the process returns to the setting A. The specific display is as shown in FIG. The left segment represents hot water / water supply settings. "H" is displayed for hot water supply setting, and "C" is displayed for water supply setting. The segment on the right represents the cooldown setting. First
"-" Is displayed in the case of the cool down setting, "d" is displayed in the case of the second cool down setting, and it is not displayed in the case of the setting without the cool down.

When the confirmation operation is performed by pressing the start key 25, the set value currently displayed is confirmed and the set value is stored in the EEPROM 35 (steps S5 and S6). In this way, the water supply / hot water supply setting and the cool down setting are completed. This setting mode is released when the power is turned off and the power to the dishwasher main body is cut off. Of course, the set value remains stored even when the power is cut off.

After the dishwasher is installed, when the user turns on the power switch 24 and presses the start key 25, this is detected in step S7 and the washing operation is started. For example, when the “80 ° C. high temperature” course of performing high temperature rinsing with high temperature water of 80 ° C. is selected, this cleaning operation course is performed.

First, the washing step is executed. Water supply valve 3
8 is opened and water is supplied up to the cleaning water level (step S8). A user puts detergent into the cleaning cabinet 2 during operation, and the water (cleaning water) in which the detergent is dissolved is stored in the cleaning cabinet 2 by this water supply.

Next, the heater 18 is operated to heat the cleaning water in the cleaning cabinet 2 and the cleaning / drainage pump 17 is operated to spray the cleaning water from the nozzle arm 16 onto the dishes in the cleaning cabinet 2. , Wash the dishes (step S9). When the temperature of the washing water reaches 58 ° C., the washing / drainage pump 17 and the heater 18 are stopped, and the washing is finished. However, when the temperature reaches 58 ° C, if 9 minutes have not elapsed since the start of washing, the washing is continued until 9 minutes have elapsed. After washing, wash and drain pump 1
The drainage operation of 7 is performed, and the wash water in the wash cabinet 2 is discharged to the outside of the machine (step S10).

Next, the rinsing process is executed. After the water supply valve 38 is opened to supply water up to the cleaning water level, the cleaning / drainage pump 17 is operated for cleaning, and water is sprayed on the dishes to rinse the dishes (steps S11 and S12). When one minute has passed from the start of rinsing, the cleaning / drainage pump 17 is stopped and the rinsing is finished. When the rinsing is finished, the washing / drainage pump 17 is drained to drain the water in the washing cabinet 2 out of the machine (step S13). The rinsing using the water which is not heated in this way is performed two more times (three times in total) to complete the rinsing process.

Next, a high temperature rinsing step is performed. The water supply valve 38 is opened to supply water up to the cleaning water level (step S1).
4). Then, the heater 18 is operated to heat the water in the washing cabinet 2 and the washing / drainage pump 17 is also washed to spray water from the nozzle arm 16 on the dishes in the washing cabinet 2 to rinse the dishes (step S15). The water in the washing cabinet 2 is heated to about 80 ° C., and in the latter half of this high-temperature rinsing, the tableware is rinsed by the high-temperature water to disinfect the tableware. Also, warming the dishes makes them easier to dry. When the water temperature reaches 80 ° C, the heater 18
Stop and finish the hot rinse.

Next, the setting without cooling down is set, that is, the setting C or the setting F is set (EE
It is determined whether it is stored in the PROM 35) (step S16).

If the drainage pipe of a house has a very high heat resistance and the high temperature water used for high-temperature rinsing is discharged to the drainage pipe as it is, there is no risk of heat damage to the drainage pipe. The person makes the setting without the cool down (setting C or setting F). By this, step S
If it is determined that the cool-down is not set in 16, the cleaning operation of the cleaning / drainage pump 17 is stopped, the draining operation is performed next, and the high-temperature water in the cleaning cabinet 2 is directly outside the machine, that is, the drainage of the house. It is discharged to the pipe (step S18).

On the other hand, when the drain pipe of a house is not so high in heat resistance and the high temperature water used for high-temperature rinsing is discharged to the drain pipe as it is, there is a risk that the drain pipe will be damaged by heat. The installer sets the cool down (setting A, B, D or E). in this case,
A cool down process is performed (step S17). This cool down processing operation will be described with reference to the flowchart of FIG.

First, while continuing the cleaning operation of the cleaning / drainage pump 17, the blower fan 21 is intermittently driven (the blower fan is intermittently energized), and the inside of the washing cabinet 2 is blown to apply high temperature water to the outside air. The high temperature water is cooled by gradually discharging the high temperature steam from the inside of the washing chamber 2 (step U
1, U2). Next, it is determined whether the first cooldown is set (setting A or setting D) or the second cooldown is set (setting B or setting E) (step U3).

In a housing complex, when the drain hose 30 is directly connected to the drain pipe having a heat resistant temperature of 60 ° C., the high temperature water is discharged to the drain pipe with almost no temperature drop. Thus, the second cooldown is set. On the other hand, in a detached house, when the heat resistance temperature of the drainage pipe is relatively high or the drainage path to the drainage pipe is relatively long, it is not necessary to cool the high temperature water so much, The first cooldown is set.

Thus, when it is determined in step U3 that the first cooldown is set, the air blowing time is set to 5 minutes (step U4). The blowing time of 5 minutes is a time required to reduce the temperature of the high temperature water to about 65 ° C., and is determined in advance by an experiment or the like. Then, when 5 minutes have elapsed from the start of air blowing, the air blowing fan 21 is stopped, the cleaning / drainage pump 17 is stopped, and the cool down is ended (steps U6 to U8). Due to this cooldown, the temperature of the high temperature water is lowered to about 65 ° C.

On the other hand, when it is determined that the second cooldown is set, the blowing time is set to 14 minutes, which is longer than the first cooldown (step U5). This blast time 14
Minute is the time required to reduce the temperature of high-temperature water to about 60 ° C., and is determined in advance by experiments or the like. Then, when 14 minutes have elapsed from the start of air blowing, the air blowing fan 21 is stopped, the cleaning / drainage pump 17 is stopped, and the cool down is ended (steps U6 to U8). Due to this cooldown, the temperature of the high-temperature water drops to about 60 ° C.

In this cool down, the blower fan 2
1 is 0.6 seconds on from the start of blowing air to 5 minutes-2.4
Intermittent drive at off for 8 seconds, 0.8 second on for up to 5 to 10 minutes, intermittent drive for 2.2 seconds off, and intermittent drive for 1 to 2 seconds off after 10 minutes. . (However, for the 1st cooldown, since the blowing time is 5 minutes,
0.6 seconds on-2.4 seconds off only intermittent drive. )
That is, the larger the amount of air blown per unit time, the greater the cooling effect. However, when the amount of air blown is increased, high-temperature steam blows out all at once. Here, by increasing the ON ratio of intermittent energization as the blowing time elapses,
Since the amount of air blown per unit time increases as the temperature of the steam decreases as the air blow time elapses, the cooling effect can be maximized while preventing the high temperature steam from bursting out at once. Can be shortened.

In this cool down, the actual water temperature in the cleaning cabinet 2 is detected by the temperature sensor 33 and the blower fan 2 is detected.
You may make 1 stop. That is, when the first cooldown is set, the cooling temperature is set to 65 ° C., and the blower fan 21 is stopped when the detected water temperature reaches 65 ° C. On the other hand, when the second cooldown is set, the cooling temperature is set to 60 ° C. and the detected water temperature is 6
When the temperature reaches 0 ° C, the blower fan 21 is stopped. If there is no problem of high-temperature steam jetting as described above, in the first cooldown and the second cooldown, the cooling time is changed by changing the blowing amount per unit time with the same blowing time. May be. In this case, the amount of air blown per unit time of the second cooldown (ratio of ON time of intermittent energization) is made larger than that of the first cooldown.

Now, returning to the flow chart of FIG. 6, when the cool-down is performed and the temperature of the high-temperature water is lowered sufficiently in this way, the washing / drainage pump 17 is drained to operate outside the machine, that is, in the house. It is discharged to the drain pipe (step S18).

Thus, when the high temperature rinsing process is completed,
Finally, the drying process is executed. In this drying process, the heater 18 and the blower fan 21 are operated to apply the air heated by the heater 18 to the tableware to dry the tableware (step S19). When this drying process is completed, "high temperature 80 ℃"
Finish the course washing operation.

In this dishwasher, in the "steam" course, the washing water is heated to about 80 ° C during washing in order to remove rice and oil stains stuck to the dishes due to the effect of high temperature steam and washing water. I have to. Therefore, in this "steam" course, the above cooldown is performed even after washing to lower the temperature of the high-temperature water and then drain the water.

By the way, the cool-down performed after high-temperature rinsing is not limited to the one in which a blower fan is used as the cooling means and the cool-down is performed by the blowing of the outside air, and the water supply valve 38 is used as the cooling means to cool the water. It is also possible to do something down. Another embodiment of this cooldown process will be described with reference to FIG.

First, the water supply valve 38 is opened for 5 seconds to supply water into the cleaning cabinet 2 (step K1). Next, the cleaning / drainage pump 17 is intermittently energized to intermittently drive the cleaning / drainage pump 17 as a cleaning pump for 10 seconds. This allows
The water in the washing cabinet 2 is stirred (step K2). At this time, the cleaning / drainage pump 17 is intermittently driven at 0.08 second on-1 second off so that almost no water is jetted from the nozzle arm 6 and the dishes are not wet. Next, the cleaning / drainage pump 17 is driven as a drainage pump for 5 seconds to drive the cleaning cabinet 2
The water inside is discharged a little (step K3). When the first cooldown is set, the number of repetitions of this series of water supply-stirring-drainage operations is set to three times. Then, by repeating this series of operations of water supply-stirring-drainage, the water in the cleaning cabinet 2 is gradually cooled, and when the series of operations is performed three times, the cool down is finished (step K4, K5). Due to this cooldown, the temperature of the high temperature water is lowered to about 65 ° C. On the other hand, when the second cooldown is set, the number of repetitions of this series of operations of water supply-stirring-drainage is set to 6 times. And
When this series of operations is performed 6 times, the cool down is finished (steps K4 and K6). Due to this cooldown, the temperature of the high-temperature water drops to about 60 ° C.

Also in this cooldown, the temperature sensor 33 detects the actual water temperature in the washing cabinet 2, and in the first cooldown, when the temperature falls below 65 ° C., the series of operations of water supply-stirring-drainage are stopped. And second
In the cool down, a series of operations may be stopped when the temperature becomes 60 ° C. or lower.

As described above, in the dishwasher of this embodiment, water having a temperature higher than the heat-resistant temperature of the drain pipe used for washing and high-temperature rinsing is cooled and then drained. It is possible to prevent heat damage.

Further, it is possible to select a first cooldown having a cooling temperature of about 65 ° C. and a second cooldown having a cooling temperature of about 60 ° C., that is, a cooldown having a different cooling temperature can be selectively performed, and dishwashing is performed. Since it is possible to select the cooldown according to the installation situation of the machine, it is possible to prevent excessive cooling and prevent heat damage to the drain pipe, while ensuring operating time, electricity bill, and water volume. Unnecessary increase can be prevented.

Further, it is possible to set the presence / absence of cool down, and the cool down can be omitted when there is no problem even if the high temperature water is drained as it is, so that the heat damage of the drain pipe can be surely prevented, Unnecessary increase in operating time, electricity bill, and water volume can be prevented.

Further, the operation keys (course key, reservation key, start key) for performing the washing operation are used without separately providing a key for selecting the presence or absence of the cooldown and the type. The keys do not increase,
The layout of the operation panel does not become complicated and the cost does not increase. Moreover, since the setting mode is entered by a special operation different from the normal operation, the setting is not easily changed by the user's erroneous operation.

Although the configuration of the dishwasher according to the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, as shown below, for example.

The dishwasher of this embodiment is a so-called drawer type dishwasher in which the washing cabinet is pulled out from the housing, but the dishwasher of the present invention is not limited to such a dishwasher.

The cool-down (cooling operation) may be a combination of the above-mentioned blowing and water-supplying. In this case, the cooling temperature (the temperature reached by cooling) can be changed by changing the blowing time (blowing amount per unit time) and / or the water supply amount.

In the dishwasher of this embodiment, two cooldowns having different cooling temperatures are prepared, but the invention is not limited to this, and more cooldowns may be prepared.

In addition, various changes can be made within the scope of the matters described in the claims.

[Brief description of drawings]

FIG. 1 is a front view showing a state where a dishwasher according to an embodiment of the present invention is attached to a system kitchen.

FIG. 2 is likewise a side view showing a state in which the dishwasher is attached to the system kitchen.

FIG. 3 is a schematic side cross-sectional view showing a state where the washing cabinet is housed in the housing in the dishwasher of the present embodiment.

FIG. 4 is a schematic side sectional view showing a state where the washing cabinet is pulled out from the housing in the dishwasher of the present embodiment.

FIG. 5 is an electrical system configuration diagram of the dishwasher of the present embodiment.

FIG. 6 is a flowchart showing a washing operation operation of the dishwasher of this embodiment.

FIG. 7 is a flowchart showing a cooldown process in a cleaning operation operation.

FIG. 8 is a diagram showing a display example in a setting mode on a segment display unit.

FIG. 9 is a flowchart showing another embodiment of the cooldown process in the cleaning operation operation.

[Explanation of symbols]

5 washroom 17 Cleaning and drainage pump 18 heater 21 Blower fan 25 Start key (selection means, setting means) 26 Koskey (selection means, setting means) 27 Reservation key (selection means, setting means) 31 Control unit 38 Water supply valve

Continued front page    (72) Inventor Kagomune             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Kazutaka Nakanishi             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Hoyuki Murakami             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Yasunori Uchi             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. F-term (reference) 3B082 BD01 BD02

Claims (5)

[Claims] 1. A dishwasher in which hot water is used for washing and rinsing the dishes, and the hot water used for the washing and rinsing is drained to the outside of the machine. The cooling operation can be performed, and a selection unit for selecting a specific cooling operation from a plurality of cooling operations is provided, and after the washing and rinsing, the cooling operation selected by the selection unit is executed to perform the cooling operation. A dishwasher characterized by cooling hot water. 2. The dishwasher according to claim 1, wherein the cooling operation cools high-temperature water by blowing air, and the temperature reached by cooling is changed by changing blowing time. 3. The cooling operation is for cooling high temperature water by water supply, and the temperature reached by cooling is changed by changing the amount of water supply.
Dishwasher as described in. 4. The selection means is an operation key for performing a cleaning operation, and a specific cooling operation can be selected by performing a special operation different from the operation for the cleaning operation. The dishwasher according to any one of 3 above. 5. A dishwasher in which hot water is used to wash and rinse dishes, and after this washing and rinsing, a cooling operation for lowering the temperature of the hot water is performed to cool the hot water before draining it out of the machine. In the above, a setting means for setting whether or not to perform the cooling operation is provided, and when the setting is made such that the cooling operation is not performed, after the washing and rinsing, the hot water is not cooled and the machine is cooled. A dishwasher characterized by draining to the outside, and when the setting means is set to perform a cooling operation, the hot water is cooled after the washing and rinsing, and then drained to the outside of the machine.