JP2000296094A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a blowing out phenomenon of hot water from a discharge part, which occurs at the time of restarting operation after opening or closing a door after temporarily stopping operation. SOLUTION: Just after finishing water supply of each process of washing, rinsing and high-temperature rinsing (S31) and just after restarting operation after temporary stop, it is judged whether the difference between a water temperature Ta and a cabinet inside temperature Tb respectively detected by two temperature sensor is smaller than 25 deg.C, 25 to 35 deg.C or larger than 35 deg.C (S33, S34). In the case of being 25 to 35 deg.C or larger than 35 deg.C, the number P of the times of intermittently repeating are respectively decided (S35, S36) to repeat intermittent driving of the motor of a washing pump the number of times P (S20). In the period of this intermittent driving, since the quantity of water to be jetted from a nozzle is reduced, the temperature raising of air in a washing cabinet becomes slow and blowing out caused by the rapid expansion of a volume is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a dishwasher.

[0002]

2. Description of the Related Art In a dishwasher, tap water is introduced into a washing cabinet, stored at the bottom of the washing cabinet, a cleaning pump is operated to suck the stored water, and water is jetted vigorously from a nozzle. There is known a configuration in which tableware stored in a container is washed.

[0003] The cleaning performance greatly depends on the temperature of water used for cleaning, and the higher the temperature of water, the better the stain removal and the shorter the time. Therefore, at the time of the washing operation or a part of the rinsing operation (hereinafter, referred to as “high-temperature rinsing”), the water is heated to a predetermined temperature by using the heater disposed at the bottom of the washing chamber, and the hot water is heated. It is easy to wash and use. In recent years, with the spread of hot water supply equipment, it has been practiced to supply hot water directly to the inside of a washing cabinet and use it for easy washing.

[0004]

However, the conventional dishwasher has the following problems. For example, when the user presses the pause button during the washing operation, performs an action such as opening the door and checking the internal state, and then closing the door again to restart the operation, The temperature of the air has dropped to almost the same level as the ambient temperature due to the intake of outside air, whereas the temperature of the water has hardly dropped. Then, since the difference between the inside temperature and the water temperature is large, high-temperature water starts to be sprayed from the nozzle by restarting the operation, and when the air in the washing room is rapidly heated by the supply of heat from the water, the inside of the washing room is Air expands rapidly. The expanded air tries to escape to the outside at once from a gap communicating between the washing chamber and the outside of the chamber, for example, a narrow exhaust port provided above the front door, etc. It may blow out and wet the surroundings, or hot water may splash on people.

[0005] Such a hot water blowing phenomenon can occur when the difference between the temperature of the water in the cleaning chamber and the temperature of the air is large, even if the temperature of the water in the cleaning chamber is not high. Thus, it can occur in some cases other than the above example.
For example, when the inside of the washing cabinet is in a cold state, a similar phenomenon may occur when the hot water is supplied from the water heater into the washing cabinet to start the washing operation. Furthermore, since the water heater is not operating during the first rinsing operation, almost the same amount of cold water as the tap water is supplied. After the temperature of the air in the washing chamber is lowered by the rinsing operation, the second rinsing operation is performed. At the time of the stroke, when the hot water supply is operated and hot water is supplied into the washing chamber, a similar phenomenon is likely to occur immediately after the second rinsing operation is started because the difference between the inside temperature and the water temperature is large.

As described above, the water blown out from the exhaust port or the like is not always high-temperature water. However, in order to express such a phenomenon easily, this phenomenon is referred to as hot water in this specification. This is referred to as a blowing phenomenon.

To solve such a problem, see, for example,
In the dishwasher described in JP-A-80332, when the door is opened and closed during operation, the washing motor is intermittently driven for a certain period of time immediately after the operation is restarted, whereby the water jetted from the nozzle into the washing chamber. To avoid a rapid expansion of the air in the washing chamber.

However, in such a conventional dishwasher, when the door is opened and closed during operation, the washing motor is always intermittently driven, so that there is no possibility that the hot water blowing phenomenon may occur. Also, there is a possibility that the cleaning performance is reduced due to a decrease in the amount of water injected from the nozzle. Further, as described above, it is not possible to cope with the prevention of the hot water blowing phenomenon that occurs except when the door is opened and closed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a dishwasher capable of reliably preventing a hot water blowing phenomenon due to the above-mentioned causes. It is in.

[0010]

Means for Solving the Problems The above hot water blowing phenomenon is as follows.
It occurs only when the difference between the temperature of the air in the washing chamber and the temperature of the stored water is somewhat large. Therefore, the dishwasher according to the present invention estimates the possibility of occurrence of the hot water blowing phenomenon by actually measuring or estimating the temperature difference, and when the possibility of occurrence is high, the amount of water injected from the nozzle. , The rapid expansion of air is suppressed.

That is, a dishwasher according to a first aspect of the present invention for solving the above problem stores water or hot water at the bottom of the washing chamber, and sprays the water or hot water from a nozzle into the washing chamber. A) a dishwasher for washing the dishes stored in the dishwasher, a) a water supply means for pressure-feeding water or hot water stored in the washing chamber to the nozzle, and b) water or hot water stored in the washing chamber. Temperature detection means for detecting a temperature, c) at the start of water supply by the water supply means, operation control means for controlling the operation of the water supply means according to the temperature detected by the temperature detection means, characterized by comprising: I have.

[0012] In the dishwasher according to the first invention, the operation control means may be configured to control the water supply means so as to reduce the amount of water supply according to the temperature detected by the temperature detection means. Specifically, the operation control means performs control such that the higher the detected temperature, the lower the water supply amount. The water supply amount may be reduced in only one stage or may be reduced in a plurality of stages. Here, when the water supply amount is reduced in a plurality of stages, the water supply pressure may be changed to a plurality of stages with the reduced time being the same, or the time for reducing the water supply pressure at a constant may be changed to a plurality of stages. It may be.

[0013] In the dishwasher according to the first aspect of the present invention, the operation control means stops the water supply before and after the operation of the water supply means is completed during the washing process, or temporarily stops during operation. Is executed and operation is resumed,
When the temperature detected by the temperature detection means is equal to or higher than a predetermined value, the water supply means may be controlled to reduce the amount of water supply.

Further, in the dishwasher according to the first aspect of the invention, the operation control means may control the temperature at the time before and after the water supply ends and the operation of the water supply means is started during a rinsing stroke or a high-temperature rinsing stroke. If the temperature detected by the detection means before and after the end of the water supply one stroke before is equal to or lower than a predetermined value, and the detected temperature at that time is equal to or higher than the predetermined value, the water supply means is controlled to reduce the water supply amount. It can also be done.

According to a second aspect of the present invention, there is provided a dishwasher in which water or hot water is stored at the bottom of a washing chamber, and the water or hot water is sprayed from a nozzle to be stored in the washing chamber. A dishwasher for washing the washed dishes, a) a water supply means for pressure-feeding water or hot water stored in a washing chamber to the nozzle, and b) a temperature of water or hot water stored in the washing chamber. First temperature detecting means for detecting; c) second temperature detecting means for detecting an ambient temperature in the washing chamber; d) detection by the first and second temperature detecting means at the start of water supply by the water supply means. Operation control means for controlling the operation of the water supply means according to the temperature.

In the dishwasher according to the second aspect of the present invention, the operation control means controls the water supply means so as to reduce the amount of water supply according to the temperatures detected by the first and second temperature detection means. be able to. Specifically, the operation control means performs control such that the larger the difference between the temperatures detected by the first and second temperature detecting means is, the smaller the water supply amount is, and the water supply amount may be reduced in only one stage. The number may be reduced in a plurality of stages.

In the dishwasher according to the second aspect of the present invention, the operation control means may reduce the amount of water supplied when the difference between the temperatures detected by the first and second temperature detecting means is equal to or greater than a predetermined value. The water supply means may be controlled.

Further, as an embodiment thereof, the operation control means includes: before and after starting water supply and starting operation of the water supply means in each of the washing, rinsing, and high-temperature rinsing steps. Alternatively, it is possible to determine whether or not the water supply amount needs to be reduced at the time when the suspension is performed during the operation and the operation is restarted.

In the dishwasher according to the second aspect of the present invention, the first temperature detecting means also serves as the second temperature detecting means, detects an ambient temperature in the washing chamber before water supply, and supplies water or hot water after water supply. May be detected.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a typical use of this type of dishwasher, at the beginning of the first step, the washing step, the temperature inside the washing box is set to the ambient temperature (for example, when the dishwasher is installed). It can be estimated that the temperature is almost equal to the room temperature. At this time, when the hot water is supplied from the water heater into the cleaning chamber and the operation is started, the difference between the water temperature and the internal temperature is considerably large, and the hot water blowing phenomenon is likely to occur. Further, when the suspension is performed during the operation, the door may have been opened and closed by the user, and the temperature in the refrigerator may have dropped to near the ambient temperature. Therefore, in the dishwasher according to the first invention, in such a situation that the inside temperature of the refrigerator can be estimated to be relatively low, the operation control means detects the water temperature at that time by the temperature detection means, and Is greater than or equal to a predetermined value,
It is determined that there is a high possibility that the difference between the water temperature and the inside temperature is large, and the water supply means is controlled to reduce the amount of water supply.

In the water supply in each of the washing step, the rinsing step, and the high-temperature rinsing step, for example, when cold water is supplied during the rinsing step and hot water is supplied during the high-temperature rinsing step, the internal temperature of the refrigerator becomes It is low, and the difference with the water temperature may be large. Therefore, in the dishwasher according to the first aspect of the invention, the operation control unit estimates a current internal temperature based on a detection result of the water temperature at the time of water supply one stroke before, and the temperature is equal to or less than a predetermined value, If the water temperature detected at this time is equal to or higher than a predetermined value, it is determined that there is a high possibility that the difference between the water temperature and the internal temperature is large, and the water supply means is controlled to reduce the water supply amount. When the amount of water supplied is reduced, even if the hot water is injected from the nozzle, the amount of heat transferred from the hot water to the air in the washing chamber is reduced, so that rapid expansion of the air is suppressed.

Therefore, according to the dishwasher according to the first aspect of the present invention, the control is performed such that the force of the water jetted from the nozzle is weakened only when there is a high possibility that the hot water blowing phenomenon actually occurs. Even when the door is opened and closed during the washing operation, when the temperature of the water is relatively low, such as when there is no possibility or very low hot water blowing phenomenon occurs, the normal water injection amount is used. The washing operation is restarted. Therefore, the hot-water blowing phenomenon can be reliably prevented, and unnecessary reduction in the cleaning ability can be avoided. Further, according to the dishwasher according to the present invention, not only immediately after the door is opened and closed, but also when the supply of hot water into the washing chamber is started halfway,
When there is a possibility that the hot water blowing phenomenon may occur, it can be surely prevented.

In the dishwasher according to the second invention,
The temperature of the air in the cleaning chamber, that is, the temperature in the chamber, is directly detected using the second temperature detecting means. Then, the operation control means detects the water temperature and the inside temperature by the first and second temperature detecting means, respectively, in a situation where the hot water blowing phenomenon may occur as described above, and the temperature difference is determined by a predetermined value. Only when the above is the case, the water supply means is controlled so as to reduce the water supply amount.

Therefore, according to the dishwasher according to the second aspect of the present invention, since the internal temperature is actually measured, the possibility of occurrence of the hot water blowing phenomenon can be more accurately determined, and the amount of water supply can be determined. Can be prevented from being wasted when it is not necessary to reduce the number.

In the dishwasher according to the second invention,
It is preferable to provide the first and second temperature detecting means independently at appropriate positions, respectively. However, when judging the possibility of occurrence of the hot water blowing phenomenon before and after starting the operation of the water feeding means after the end of water supply, By using a first temperature detecting means provided at a position immersed in water, the first temperature detecting means detects an ambient temperature before immersion in water before water supply, and detects a water temperature after water supply. The number of means can be reduced.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a dishwasher according to an embodiment of the first invention (hereinafter referred to as "embodiment 1") will be described with reference to FIGS.

FIG. 1 is a side sectional view showing the entire structure of a dishwasher according to the present embodiment. A washing cabinet 2 also serving as a drying chamber is disposed inside the machine casing 1, and a door 3 whose lower end is pivotally supported is provided at the front opening of the washing cabinet 2 in the forward direction (the direction of arrow P in FIG. 1). ). A rotatable arm 4 having a plurality of nozzles 5 formed on the upper surface is provided at the center of the bottom of the washing chamber 2. In addition, a water tank 6 provided with a circulation port 7 and a drain port 8 at the side thereof is provided at the bottom of the washing chamber 2 so as to communicate with each other. A mesh filter 9 for collecting residual vegetables is provided.

A washing and drainage pump 10 is disposed below the bottom of the washing box 2. The washing and drainage pump 10 is configured such that the impeller rotates in both the left and right directions. At the time of washing, the impeller rotates in a predetermined direction to send out the water sucked from the circulation port 7 of the water storage tank 6 to the arm 4. When draining, the impeller rotates in the opposite direction,
The water sucked from the drain port 8 is discharged to the outside through the drain hose 11. Water supplied from the outside via the water supply valve 12 is poured into the cleaning chamber 2 from a water supply port 13 provided behind the cleaning chamber 2. A water level detection chamber 14 having a float (not shown) for detecting a water level in the cleaning chamber 2 is disposed behind the cleaning chamber 2, and the water in the cleaning chamber 2 is detected through a communication port (not shown). It also flows into the room 14. At the bottom of the washing chamber 2, there is provided a loop-shaped heater 15 for making a large orbit around the rotation axis of the arm 4 to warm the washing water and the rinsing water and to raise the temperature of the air in the washing chamber 2 during drying. Is provided.

Further, the fan motor 1
A blower fan 16 that is driven to rotate by the fan 7 is provided. When the blower fan 16 is rotated, outside air sucked from an intake port 18 formed on the back surface of the machine frame 1 is introduced into the cleaning chamber 2. You. In addition, the humid air in the cleaning chamber 2 is
The air is discharged to the outside through an exhaust port 19 provided at the upper part.

FIG. 2 is a plan view of the operation panel 20 provided below the door 3 of the dishwasher. The operation panel 20 includes a power switch 21, a start key 2
2, a plurality of indicator lamps 2 that are provided with a course selection key 23 and a hot water supply switching key 24 and that indicate the selected course.
5. An indicator 26 for displaying the remaining time as a numerical value, and an indicator light 27 for selecting hot water supply or water supply are provided.
The start key 22 also serves as a temporary stop key. When the start key 22 is pressed during the driving operation, the operation is temporarily stopped at that time, and the start key 22 is returned from the state.
When is pressed, the operation is resumed from the point where it was interrupted earlier.

FIG. 3 is an electrical configuration diagram of a main part of the dishwasher of this embodiment. The control unit 30 includes a CPU 31 and a ROM 3
2, a microcomputer including a RAM 33, a timer 34, and the like. The ROM 32 stores a control program for performing an operation described later. The functions described later are achieved by the CPU 31 executing various calculations and processes according to the control program.
The control unit 30 receives an operation signal from a power switch 21, a start key 22, a course selection key 23, and the like provided on the operation panel 20, and detects the temperature of water stored at the bottom of the cleaning chamber 2. A detection signal is input from the temperature sensor 35. The control unit 30
Causes the display 26 to perform a predetermined display, and sounds the buzzer 36 if necessary. Further, the control unit 30
The pump motor 101 and the fan motor 17 of the water supply valve 12, the washing / draining pump 10 are
Control the operation of.

FIG. 4 is a flowchart showing the flow of the entire process in the dishwasher, and FIG. 5 is a graph showing an example of a change in the temperature detected by the temperature sensor 35 when the standard course is operated. In the example shown in FIG. 5, it is assumed that water having a water temperature of about 20 ° C. is supplied at the time of water supply in each step.

The operation of the dishwasher will be schematically described with reference to FIGS. The user stores the tableware in a tableware basket (not shown), opens the door 3 and installs the tableware inside the washing cabinet 2. When operation start is instructed by a predetermined operation,
First, a washing step is performed (step S1). Specifically, the water supply valve 12 is opened in accordance with an instruction from the control unit 30, and a predetermined amount of water is stored at the bottom of the washing chamber 2. After the water supply is completed, when the washing and draining pump 10 is driven, the washing and draining pump 10 sucks water from the circulation port 7 of the water storage tank 6 and sends out the water to the arm 4. The water rushes out of the small-diameter nozzle 5 and the arm 4 rotates by the reaction of the jet of water. The jetted water hits the dishes and flows down to the bottom of the washing room 2,
The solid matter is removed by the filter 9 and circulated to the water storage tank 6. During the washing operation, the heater 15 is energized, and the stored water is heated by the heater 15, and its temperature rises almost linearly as shown in FIG.

When the water temperature reaches a predetermined temperature (58 ° C. in this example), the washing operation is terminated and the washing and drainage pump 10
Is driven to function as a drainage pump,
The water sucked from the drain port 8 is discharged to the drain hose 11.

Next, a rinsing step is performed (step S2). Specifically, the water supply valve 12 is opened in the same manner as in the washing process, and clean water for rinsing is newly added to the washing chamber 2.
Will be introduced. At this time, the heater 15 is not operated, but the water introduced into the cleaning chamber 2 by the residual heat becomes hot water. And the washing and drainage pump 1
0 is driven so as to function as a washing pump, a rinsing operation for about 1 minute is performed, and then water in the washing chamber 2 is discharged. In this example, such rinsing is repeated three times (steps S2a, 2b, 2c).

Thereafter, a high-temperature rinsing step is performed as a final rinsing (step S3). Specifically, the water supply valve 12 is opened as in the washing and rinsing steps, and clean water is newly introduced into the washing chamber 2. After the water supply is completed, the washing and draining pump 10 is driven to function as a washing pump. Further, the heater 15 is driven, and the temperature of the stored water rises as the operation is continued. When the water temperature reaches a predetermined temperature (in this example, 70 ° C.), the high-temperature rinsing operation is terminated. By performing the final rinsing step using hot water in this way, the dishes can be sterilized and the dishes can be warmed, so that quick drying can be performed in the next drying step. After the high-temperature rinsing, the water remaining at the bottom of the washing box 2 is discharged, the outside air is sent into the washing box 2 by rotating the blower fan 16, and the air is heated by the heater 15 to dry the dishes (step S4). ).

In this dishwasher, in order to prevent the above-mentioned hot water bleeding phenomenon, the temperature detected by the temperature sensor 35 between the start of the washing step in step S1 and the end of the high-temperature rinsing step in step S3. The drive control process of the pump motor 101 utilizing the above is repeatedly executed. FIG. 6 is a flowchart showing this processing. Hereinafter, a process for preventing the hot water blowing phenomenon will be described with reference to this flowchart.

First, in this dishwasher, the control unit 30 reads a detection signal from the temperature sensor 35 at the end of water supply in each of the washing step, the rinsing step, and the high-temperature rinsing step shown in FIG. It is temporarily stored in the RAM 33.

When the execution of the process shown in FIG. 6 is started, the control unit 30 determines whether or not the water supply has just been completed in any of the washing, rinsing, and high-temperature rinsing steps (step S10). ). If it is determined that it is not immediately after the end of water supply, it is determined whether or not it is immediately after the start key 22 has been pressed to resume the operation after the suspension has been performed next (step S11). If it is determined that it is not immediately after the restart of the operation, the process proceeds to step S19 described later. Normally, the suspension is performed during operation when the door 3 needs to be opened and closed. Therefore, when the operation is resumed after the suspension, the door 3 is opened and closed by the user, and the 2
It is possible that the temperature of the air inside has dropped to near ambient temperature (about 20 ° C.). Therefore, the process proceeds to step S14.

If it is determined in step S11 that the water supply has just finished, it is next determined whether or not the current stroke is a washing stroke (step S12). Skips step S13 and proceeds to step S14. This is because the washing step is the first of all the steps, so there is no preceding step described below, and the determination in step S13 is meaningless.
If it is not a washing step, that is, if it is a rinsing step or a high-temperature rinsing step, the water temperature data at the end of water supply in the preceding process stored in the RAM 33 is read out, and it is determined whether or not the water temperature is lower than 30 ° C. (Step S1
3). The preceding step refers to a step executed one time before in the flowchart shown in FIG. 4, such as a washing step in the case of the first rinsing step and a third rinsing step in the case of the high-temperature rinsing step. Say.

In particular, in the rinsing stroke, the water temperature data at the end of the water supply in the preceding stroke is used for estimating the current inside temperature. That is, during the rinsing process, the heater 1
Since the water stored in the cleaning chamber 2 is not heated, the temperature of the air in the cleaning chamber 2 and the temperature of the water are close to each other by spraying the water stored in the cleaning chamber 2 from the nozzle 5. For example, when hot water is supplied in the preceding process, the inside temperature of the refrigerator increases due to execution of the operation using the hot water. Since this high internal temperature does not decrease so much even when water is supplied in the next stroke, it can be assumed that the internal temperature is high at the start of operation of the pump in the next stroke. On the other hand, when tap water is supplied in the preceding step, the temperature in the refrigerator decreases due to the execution of the operation using the water. Even if hot water is supplied at the time of water supply in the next step, this low internal temperature does not suddenly rise, so that the internal temperature is kept low. Therefore, when the water temperature at the end of the water supply in the preceding step is 30 ° C. or higher, it can be estimated that the temperature in the refrigerator is relatively high. In other words, the difference between the water temperature and the temperature in the refrigerator is relatively small. You can judge. Therefore, in this case, the process proceeds from step S13 to S19.

When it is determined in step S11 that the operation has just been restarted, when it is determined in step S12 that the washing process is being performed, or when it is determined in step S13 that the water temperature in the preceding process is lower than 30 ° C. If
The controller 30 reads the water temperature T detected by the temperature sensor 35 at that time (step S14), and the water temperature T becomes 3
It is determined whether the temperature is lower than 0 ° C. (step S15).
If the water temperature T is lower than 30 ° C., even if the temperature in the refrigerator is low, it is determined that there is no possibility of occurrence of the hot water blowing phenomenon because the difference between the water temperature and the temperature in the refrigerator is small, and the process proceeds to step S19. move on.

If it is determined in step S15 that the water temperature T is equal to or higher than 30 ° C., it is determined whether the water temperature T is lower than 40 ° C. (step S16). Where water temperature T
Is determined to be less than 40 ° C., the water temperature T becomes 3
It should be in the range of 0 ° C or more and less than 40 ° C. in this case,
Although there is a possibility that the hot water blowing phenomenon may occur with the driving of the washing and drainage pump 10, the difference between the water temperature and the internal temperature is not so large, so that it can be determined that the phenomenon can be settled in a relatively short time. . Therefore, the intermittent operation request flag F is set to 1 and the number of intermittent repetitions P is set to 5 (step S17).

On the other hand, at the step S16, the water temperature T becomes 4
If it is determined that the temperature is 0 ° C. or more, it can be determined that the difference between the water temperature and the internal temperature is large, and that the hot water blowing phenomenon may continue for a relatively long time. Therefore, the intermittent operation request flag F is set to 1 and the number of intermittent repetitions P is set at step S
Set to 10 larger than 17 (step S1
8).

To summarize the above processing contents, if there is a possibility that the hot-water blowing phenomenon may occur immediately after the start of the washing process, steps S10 → S12 → S14 → S1
The process proceeds from 5 to S16 to S17 or S18, the intermittent operation request flag F is set to 1, and the number of intermittent repetitions P is set to 5 or 10. In addition, if there is a possibility that the hot water blowing phenomenon may occur immediately after the suspension is performed during the operation and the operation is resumed, step S
10 → S11 → S14 → S15 → S16 → S17 or S
The process proceeds to step 18, where the intermittent operation request flag F is set to 1 and the number of intermittent repetitions P is set to 5 or 10. Further, if cold water is supplied in the preceding process and hot water is supplied in the next process, there is a possibility that a hot water blowing phenomenon may occur.
0 → S12 → S13 → S14 → S15 → S16 → S17
Alternatively, the process proceeds to S18, where the intermittent operation request flag F is set to 1 and the number of intermittent repetitions P is set to 5 or 10.

Next, the controller 30 determines whether or not the intermittent operation request flag F is 1 (step S19). If the intermittent operation request flag F is not 1, that is, if it is 0, the pump motor 101 Is driven as usual (step S21). The driving at this time is performed, for example, by the motor 101.
Is a continuous operation.

In step S19, the intermittent operation request flag F
Is 1, one cycle is on for 0.2 seconds-1.
The pump motor 101 is intermittently driven with 0 second off (step S20). Then, it is determined whether or not such an intermittent drive has been performed for the number of repetitions P determined in step S17 or S18 (step S22).
If not, the process returns to the main loop. When the intermittent drive cycle is repeated the number of times P, the process proceeds from step S22 to S23, resets the intermittent operation request flag F to 0, and returns to the main loop.

By the above processing, step S17
If the number of intermittent repetitions P is set to 5 at 0, 0.
Intermittent driving for 2 seconds on-1.0 seconds off is repeated five times. During such an intermittent drive, the pressure of the water sent to the arm 4 decreases, the amount of water jetted from the nozzle 5 decreases, and the speed of the self-running rotation of the arm 4 also decreases. Therefore, the state of the momentum of the water jetted from the nozzle 5 continues for about 6 seconds, and then returns to the normal jet momentum. If the amount of injected water is small, the amount of heat transferred from the water to the air in the cleaning chamber 2 is small, so that the temperature of the air in the cleaning chamber 2 rises slowly, and as a result, hot water blowing from the exhaust port 19 is avoided. . When the number of intermittent repetitions P is set to 10 in step S18, the intermittent driving of 0.2 seconds on-1.0 seconds off is repeated 10 times, and
The state in which the momentum of the water injected from the nozzle 5 is weak continues for a second. Therefore, even when the difference between the water temperature and the internal temperature is extremely large, rapid expansion of the air is unlikely to occur, so that the hot water blowing phenomenon can be avoided.

Next, a dishwasher according to an embodiment of the second invention (hereinafter referred to as "Example 2") will be described. In the first embodiment, the inside temperature is estimated based on the temperature detected by only the temperature sensor 35. On the other hand, in the dishwasher according to the second embodiment, a water is not stored in the washing chamber 2 at a position where the water is stored. Preferably, another temperature sensor for detecting the temperature of the air in the washing chamber 2 at a position where the water injected from the nozzle 5 is not splashed (this is referred to as a "second temperature sensor" and detects the water temperature) Is referred to as a “first temperature sensor”). With the first and second temperature sensors, the water temperature and the inside temperature can be simultaneously measured.

FIG. 7 is a flow chart showing a process for preventing the hot water blowing-out phenomenon in the dishwasher of the second embodiment. The processing contents other than the part surrounded by the dotted line are the same as those of the first embodiment shown in FIG.

When the execution of this processing is started, the control unit 3
0 reads the water temperature Ta and the internal temperature Tb detected by the first temperature sensor and the second temperature sensor, respectively (step S30). Thereafter, it is determined whether or not the water supply in the washing step, the rinsing step or the high-temperature rinsing step has just finished (step S31). If it is determined that it is not immediately after the end of water supply,
Next, it is determined whether or not the operation has just been resumed after the suspension (step S32). If it is determined that the operation has not been immediately resumed, the process proceeds to step S19.

If it is determined in step S31 that the water supply has just finished, or if it is determined in step S32 that the operation has just restarted, the inside temperature Tb and the water temperature Ta are determined.
Is determined, and it is determined whether the difference is less than 25 ° C. (step S33). If the difference is less than 25 ° C., it is determined that there is no fear of the hot water blowing phenomenon, and the process proceeds to step S19. If it is determined that the temperature difference is equal to or higher than 25 ° C., it is next determined whether the temperature difference is lower than 35 ° C. (step S34). Here, when it is determined that the temperature difference is less than 35 ° C., the temperature difference should be in a range of 25 ° C. or more and less than 35 ° C. In this case, although there is a possibility that hot water is blown out with the driving of the washing and drainage pump 10, it can be determined that the blow-out will be completed in a relatively short time. Therefore, the intermittent operation request flag F is set to 1 and the number of intermittent repetitions P is set to 5 (step S35).

On the other hand, in step S34, the temperature difference is 35 ° C.
In the case described above, it can be determined that the hot-water bleeding phenomenon may continue for a relatively long time. Therefore, the intermittent operation request flag F is set to 1 and the number of intermittent repetitions P is set to 10 (step S36). When the number of intermittent repetitions P is determined in this manner, the process proceeds to step S19 and thereafter, and the pump motor 101 is intermittently driven as described above.

In the dishwasher according to the second embodiment,
Although it is necessary to additionally provide a temperature sensor for measuring the temperature inside the refrigerator, it is possible to more accurately grasp whether or not the condition is such that the hot water blowing phenomenon occurs, so that the hot water blowing phenomenon is reliably prevented. When the condition is such that the hot water blowing phenomenon does not occur, the operation of the washing and draining pump 10 is maintained in a normal state, so that there is no possibility that the washing capacity is unnecessarily reduced.

In the second embodiment, two temperature sensors are provided. However, as in the first embodiment, only the temperature sensor provided at a position immersed in water is used to detect the inside temperature and the water temperature. ,
The temperature difference between the inside temperature and the water temperature may be determined to perform the determination process as in the second embodiment. That is,
Immediately before the start of water supply in any of the processes, no water is stored at the bottom of the cleaning chamber 2, and the temperature sensor is exposed inside the cleaning chamber 2. Therefore, if the temperature is detected in that state, it can be considered that the inside temperature is measured.

The above embodiment is merely an example, and it is apparent that modifications and changes can be made as appropriate within the spirit of the present invention.

For example, the method of reducing the amount of water supply when starting the injection of water from the nozzle 5 is not limited to the methods of the first and second embodiments. That is, in the first and second embodiments, the pump motor 101 is intermittently driven for 0.2 second on-1.0 second off. The inertial rotation of 101 stops, and the injection of water from nozzle 5 temporarily stops. Therefore, not only the injection pressure of water from the nozzle 5 is weakened, but also the injection itself becomes intermittent. However, if the off-time is relatively short, the injection amount can be reduced without interrupting the water injection. If the pump motor can control the rotation speed by inverter driving or the like, the rotation speed may be reduced instead of intermittent driving. If the rotation speed of the pump motor can be controlled, the rotation speed is initially set to a very low speed to minimize the water injection amount, and the rotation speed is gradually increased to increase the water injection amount. May be increased.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing the entire configuration of a dishwasher according to an embodiment (Embodiment 1) of the first invention.

FIG. 2 is a plan view of an operation panel of the dishwasher according to the first embodiment.

FIG. 3 is an electric system configuration diagram of the dishwasher according to the first embodiment.

FIG. 4 is a flowchart showing the flow of the entire process in the dishwasher according to the first embodiment.

FIG. 5 is a graph showing an example of a change in a detected temperature when a standard course operation is performed.

FIG. 6 is a flowchart of hot water blowing prevention processing in the dishwasher according to the first embodiment.

FIG. 7 is a flowchart of hot water blowing prevention processing in a dishwasher according to an embodiment (Embodiment 2) of the second invention.

[Explanation of symbols]

 2 ... Washing cabinet 5 ... Nozzle 6 ... Water tank 10 ... Washing / draining pump 101 ... Pump motor 12 ... Water supply valve 22 ... Start key 30 ... Control unit 35 ... Temperature sensor 37 ... Load drive unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsunori Shinmura 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazutaka Nakanishi 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. F term (reference) 3B082 DA00 DB01 DC01 DC04

Claims (9)

[Claims] 1. A dishwasher for storing water or hot water at the bottom of a washing chamber and spraying the water or hot water from a nozzle to wash dishes stored in the cleaning chamber, a) storing in the washing chamber Water supply means for pressure-feeding the water or hot water being supplied to the nozzle; b) temperature detection means for detecting the temperature of the water or hot water stored in the washing chamber; c) at the start of water supply by the water supply means. A dishwasher, comprising: operation control means for controlling the operation of the water supply means according to the temperature detected by the temperature detection means. 2. The dishwasher according to claim 1, wherein the operation control means controls the water supply means to reduce a water supply amount in accordance with a temperature detected by the temperature detection means. 3. The operation control means, at the time before and after the water supply ends during the washing process and before and after the operation of the water supply means is started, or at the time when the operation is temporarily stopped and the operation is restarted. 3. The dishwasher according to claim 2, wherein when the temperature detected by the temperature detecting means is equal to or higher than a predetermined value, the water supplying means is controlled to reduce the amount of water supplied. 4. The method according to claim 1, wherein the operation control means determines whether the water supply is completed during the rinsing stroke or the high-temperature rinsing stroke and before or after the operation of the water feeding means is started. The method according to claim 2, wherein when the detected temperature is equal to or lower than a predetermined value and the detected temperature at that time is equal to or higher than a predetermined value, the water supply unit is controlled to reduce the water supply amount. Dishwasher as described. 5. A dishwasher for storing water or hot water at the bottom of a washing chamber and spraying the water or hot water from a nozzle to wash dishes stored in the washing chamber, wherein: a) storing in the washing chamber; Water supply means for pressure-feeding the water or hot water supplied to the nozzle; b) first temperature detecting means for detecting the temperature of the water or hot water stored in the cleaning chamber; and c) the ambient temperature in the cleaning chamber. A second temperature detecting means for detecting, and d) an operation control means for controlling an operation of the water feeding means in accordance with a temperature detected by the first and second temperature detecting means at a start of water feeding by the water feeding means. A dishwasher characterized by comprising: 6. The operation control means comprises: the first and second operation control means.
The dishwasher according to claim 5, wherein the water supply unit is controlled so as to reduce a water supply amount according to a temperature detected by the temperature detection unit. 7. The operation control means controls the water supply means to reduce the water supply amount when the difference between the temperatures detected by the first temperature detection means and the second temperature detection means is equal to or greater than a predetermined value. The dishwasher according to claim 6, characterized in that: 8. The operation control means may be configured to temporarily stop water supply during each of a washing step, a rinsing step, and a high-temperature rinsing step and to start operation of the water supply means, or temporarily during operation. When the stop is executed and the operation is resumed,
The dishwasher according to claim 7, wherein a determination is made as to whether or not the amount of water is required to be reduced. 9. The first temperature detecting means also serves as a second temperature detecting means, and detects an ambient temperature in a washing chamber before water supply,
The dishwasher according to any one of claims 5 to 8, wherein the temperature of water or hot water is detected after water is supplied.