JP2000083887A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce operation sounds associated with the operation of a washing pump and improve heating efficiency, when washing water is heated with a heater. SOLUTION: In the washing process, until the temperature of washing water increases to 40 deg.C, the washing pump is operated at a weak discharge pressure by setting the number of revolutions of a pump motor at 150 rpm; after the temperature rises to 40 deg.C, by setting the number of revolutions of the pump motor at 3,000 rpm, the washing pump is operated at a strong discharge pressure, and when the temperature increases to 60 deg.C, the heater and the washing pump are brought to the halt. Eve in the heating and rinsing process, though the setting temperature is different, the same control as for the washing process is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher having a structure for washing dishes by operating a washing pump while heating washing water in a washing tank with a heater.

[0002]

Conventionally, in a dishwasher, for example, as shown in FIG.
There is a configuration in which the steps from washing to drying of tableware are automatically performed by sequentially executing a rinsing step, a heating rinsing step, and a drying step.

In this cleaning process, when the operation is started with tap water (water temperature is set to 20 ° C.), the cleaning water supplied to the cleaning tank is supplied by a heater provided at the bottom of the cleaning tank. This is performed by operating the cleaning pump while heating. When the cleaning pump operates, the cleaning water in the cleaning tank is sucked into the cleaning pump, and the suctioned cleaning water flows from the ejection port of the cleaning arm disposed in the cleaning tank to the tableware in the cleaning tank. The tableware is washed by the discharged washing water. In addition, by putting a detergent in a predetermined part before starting operation, the detergent is mixed with the washing water. Then, the temperature of the washing water is detected by a temperature sensor provided at the outer bottom of the washing tank. When the detected temperature rises to 60 ° C., the washing pump is stopped, the heating of the heater is stopped, and the wastewater is drained. After going,
Move to the rinsing process.

[0004] The rinsing step is performed by supplying cleaning water into the cleaning tank and then operating the cleaning pump for a predetermined time, for example, one minute. At this time, the dishes are rinsed by the washing water discharged from the ejection holes of the washing arm, and the detergent attached to the dishes is dropped. After performing this rinsing step twice, the process proceeds to the heating rinsing step. This heating rinsing step is for rinsing while increasing the temperature of the washing water supplied into the washing tank, and is performed by operating the washing pump while energizing the heater to heat the washing water.
When the temperature of the washing water detected by the temperature sensor is 70,
When the temperature has risen to ° C., the washing pump is stopped, the heating of the heater is stopped, the water is drained, and the process proceeds to the drying process.

[0005] The drying process is performed by driving the fan motor of the blower while intermittently operating the heater. At this time, with the driving of the fan motor, the air outside the washing tank is supplied into the washing tank, and the air containing moisture in the washing tank is exhausted to the outside of the washing tank. It will be dried.

However, the above-described conventional configuration has the following disadvantages. First, when the cleaning pump is operated in the cleaning step, the rinsing step, and the heating rinsing step, the pump motor for operating the cleaning pump is always driven at a constant rotation speed, for example, 3000 rpm. Therefore, during operation of the cleaning pump,
There is a problem that the operation noise of the cleaning pump is always loud because the operation is always performed at a strong discharge pressure.

Further, when the cleaning pump is operated, the water level in the cleaning tank is greatly reduced, so that the heater at the bottom of the cleaning tank is exposed from the surface of the cleaning water. For this reason, in the washing step and the heating and rinsing step, there is also a disadvantage that the heating efficiency when the washing water is heated by the heater is poor. In this case, if the water supply amount is increased and the water level in the cleaning tank is raised, the heater will be immersed in the cleaning water, but since the amount of the cleaning water increases, it takes a long time to raise the cleaning water to the set temperature. Will be taken.

The present invention has been made in view of the above circumstances, and has as its object to reduce the operating noise when operating a cleaning pump and to improve the heating efficiency when cleaning water is heated by a heater. To provide a dishwasher.

[0009]

In order to achieve the above object, the invention according to claim 1 comprises a washing tank for accommodating tableware,
A heater provided at the bottom of the washing tank for heating the washing water supplied to the washing tank, and sucking the washing water in the washing tank, and using the sucked washing water for the dishes in the washing tank. A washing pump that discharges the washing water, a temperature sensor that detects the temperature of the washing water, and a control unit that controls the washing pump, wherein the control unit is configured to control the temperature in accordance with the temperature detected by the temperature sensor. The discharge pressure of the cleaning pump is changed.

In the above-described apparatus, when the cleaning pump is operated while the cleaning water is heated by the heater, for example, when the temperature detected by the temperature sensor is lower than a preset temperature, the cleaning pump is set to a low discharge pressure. When the temperature detected by the temperature sensor rises to the set temperature, the cleaning pump is controlled to operate at a high discharge pressure. By changing the discharge pressure of the cleaning pump in accordance with the temperature detected by the temperature sensor in this manner, the operating noise can be reduced as compared with a case where the cleaning pump is always operated only at a strong discharge pressure.

When the cleaning pump is operated at a low discharge pressure, the amount of cleaning water sucked by the cleaning pump from the cleaning tank per unit time is reduced. As compared with the case where the cleaning tank is operated, a decrease in the water level in the cleaning tank is reduced, and the cleaning water can be heated while the heater at the bottom of the cleaning tank is immersed in the cleaning water.
Thereby, the heating efficiency of the heater with respect to the cleaning water can be improved.

In this case, it is preferable that the motor for operating the cleaning pump is constituted by a DC brushless motor and is controlled by an inverter (the invention of claim 2). According to this, the rotation speed of the motor can be easily controlled, so that the discharge pressure of the cleaning pump can be easily controlled.

According to a third aspect of the present invention, in the cleaning process of cleaning the dishes by operating the cleaning pump while heating the cleaning water by the heater, the control means may control the temperature detected by the temperature sensor to a preset temperature. The cleaning pump is operated at a low discharge pressure until the temperature rises, and the cleaning pump is operated at a high discharge pressure after the temperature rises to the set temperature. According to this, in the cleaning process, claim 1 is provided.
The same operation and effect as in the case of can be obtained.

According to a fourth aspect of the present invention, in the cleaning step, the control means operates the cleaning pump at a weak discharge pressure until the temperature detected by the temperature sensor rises to a first preset temperature. After the temperature rises to the first set temperature, the cleaning pump is operated at a strong discharge pressure for a predetermined time,
Until the temperature detected by the temperature sensor rises to the second set temperature higher than the first set temperature, the cleaning pump is operated at a weak discharge pressure and rises to the second set temperature. Thereafter, the cleaning pump is operated at a high discharge pressure for a predetermined time.

A fifth aspect of the present invention is characterized in that, in the fourth aspect of the present invention, the cleaning pump is operated at alternately high and low discharge pressures instead of operating the cleaning pump at high discharge pressure. And According to this, the cleaning can be performed more effectively.

According to a sixth aspect of the present invention, in the invention of the fourth or fifth aspect, the control means determines that the temperature detected by the temperature sensor is the first temperature.
The heater is controlled so that the set temperature is maintained for a predetermined time after the temperature has risen to the second set temperature and for a predetermined time after the temperature has risen to the second set temperature.

In this case, when the first set temperature is set to, for example, about 40 ° C., which is a temperature at which the protein does not solidify, the temperature at which the protein does not solidify is maintained for a relatively long time, and during this time the cleaning pump is set. By operating at a high or low alternating discharge pressure, it becomes possible to effectively clean proteins and the like. Further, when the second set temperature is set to, for example, about 60 ° C., which is a temperature at which oil stains and the like are easily melted, the temperature at which oil stains and the like are easily melted is maintained for a relatively long time, and during this time, By operating the cleaning pump at an alternating discharge pressure of high or low, oil stains and the like can be effectively cleaned.

According to a seventh aspect of the present invention, in the cleaning step, the control means operates the cleaning pump at a weak discharge pressure until the temperature detected by the temperature sensor rises to a first preset temperature. After the temperature rises to the first set temperature, the cleaning pump is operated at a strong discharge pressure until the temperature rises to a second set temperature higher than the first set temperature, and After the temperature has risen to the second set temperature, the cleaning pump is operated at a weak discharge pressure until the temperature rises to the third set temperature higher than the second set temperature, and the third set temperature is set. After rising to the fourth set temperature higher than the third set temperature, the cleaning pump is operated at a high discharge pressure until the fourth set temperature is set.

According to an eighth aspect of the present invention, in the seventh aspect of the present invention, the cleaning pump is operated at alternately high and low discharge pressures instead of operating the cleaning pump at high discharge pressure. And

According to a ninth aspect of the present invention, in the seventh and eighth aspects, the first set temperature is about 40 ° C., the second set temperature is about 50 ° C., the third set temperature is about 55 ° C., The fourth set temperature is about 60 ° C. According to this, it becomes possible to more effectively remove proteins and oil stains.

According to a tenth aspect of the present invention, there is provided a washing step of operating a washing pump while heating washing water by a heater to wash dishes, a plurality of rinsing steps, and a washing pump while heating washing water by a heater. In the heating rinsing step in which rinsing is performed and the heating rinsing step is performed in sequence, the control means operates the cleaning pump at a strong or weak alternate discharge pressure in the last one of the plurality of rinsing steps. The cleaning pump is operated at a low discharge pressure in at least one rinsing stroke prior to the rinsing stroke. According to this, the operating noise in the rinsing stroke can be reduced as compared with the case where the cleaning pump is operated at a strong discharge pressure in all of the plurality of rinsing strokes.

According to an eleventh aspect of the present invention, the control means operates the cleaning pump at a weak discharge pressure until the temperature detected by the temperature sensor rises to a first preset temperature in the heating rinsing step. , After rising to the first set temperature, a second set temperature higher than the first set temperature
The cleaning pump is operated at a high discharge pressure until the temperature rises to the set temperature. According to this, in the heating rinsing step, the same operation and effect as in the first aspect can be obtained.

Further, the invention of claim 12 provides the above-mentioned claim 1.
The invention according to the first aspect is characterized in that the cleaning pump is operated at alternately high and low discharge pressures instead of operating the cleaning pump at high discharge pressure.

The invention of claim 13 is the invention of claim 11 or 1
The invention of the second aspect is characterized in that the first set temperature is about 60 ° C. and the second set temperature is about 80 ° C. According to this, about 60 ° C. effective for killing E. coli and the like
Since the washing pump is rinsed between -80 ° C with alternately high or low discharge pressure, rinsing and sterilization can be performed effectively.

According to a fourteenth aspect of the present invention, in the heating and rinsing step, the control means operates the cleaning pump at a weak discharge pressure until the temperature detected by the temperature sensor rises to a preset temperature, and rises to the preset temperature. After that, the cleaning pump is operated at a high discharge pressure for a predetermined time. In this case, when the set temperature is set to, for example, about 80 ° C., rinsing and sterilization can be performed effectively.

According to a fifteenth aspect of the present invention, in the invention of the fourteenth aspect, the cleaning pump is operated at alternately high and low discharge pressures instead of operating the cleaning pump at high discharge pressure. I have.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In this case, the first embodiment is an embodiment corresponding to the inventions of claims 1, 2, 3, and 11.

First, in FIGS. 2 and 3, a washing tank 2 is provided inside a main body 1 of a dishwasher, and a door 3 whose lower part is pivotally supported by the main body 1 is provided at the front of the main body 1. It is movably provided, and the front surface of the cleaning tank 2 is opened and closed by its door 3. A heater 4 is provided at the bottom of the washing tank 2, and washing arms 5 and 6 are provided at a lower portion and an upper portion of the washing tank 2. Baskets 7 and 8 are housed so that they can be pulled out.

The deepest portion on the front side of the bottom of the washing tank 2 is a water storage portion 9, and a cleaning pump 10 and a drainage pump 11 are disposed behind the water storage portion 9. In this case, the cleaning pump 10 and the drainage pump 11 use a common pump motor 12 as a drive source. The pump motor 12 is constituted by a DC brushless motor capable of rotating forward and backward, and is controlled via an inverter circuit 13 (see FIG. 4). The pump motor 12 is configured to operate the cleaning pump 10 by rotating forward and operate the drainage pump 11 by rotating the pump motor 12 in reverse.

Here, the cleaning pump 10 is connected to the cleaning tank 2.
The washing water inside is sucked from the water storage unit 9 through the connection unit 14,
The suctioned cleaning water is supplied to the cleaning arms 5 and 6 through the water supply unit 15 and the water supply pipe 16 by the cleaning arms 5 and 6. The food is discharged from the holes into the tableware stored in the tableware baskets 7 and 8. The drain pump 11 sucks the washing water in the washing tank 2 from the water storage unit 9 through the connection pipe 17, and discharges the sucked washing water to the outside through the drain hose 18.

A temperature sensor 19 composed of a thermistor is provided on the lower surface of the bottom of the cleaning tank 2 at a position deviated from the water storage section 9. The temperature is detected. A water level switch 20 for detecting a water level in the cleaning tank 2 is provided at a rear side of a lower portion of the cleaning tank 2.

A water supply valve 21 is provided at a rear portion of the cleaning tank 2, and a water supply hose 22 is connected to the water supply valve 21, and tap water (not shown) is supplied to the cleaning tank via the water supply hose 22 and the water supply valve 21. 2 is supplied as washing water. Further, a blower 23 and a blower duct 24 are arranged on the back of the washing tank 2, and an intake duct 25 and an exhaust duct 26 are arranged above the washing tank 2. The blower 23 includes a fan motor 27 and a fan 28 that is rotated by the fan motor 27. By the blowing action of the fan 28, air outside the machine is sucked in through the intake duct 25 and the inside of the cleaning tank 2 is blown through the blow duct 24. And the air in the cleaning tank 2 is discharged to the outside through the exhaust duct 26.

As shown in FIG. 3, a door lock lever 29 and an operation panel 30 are provided on the upper front part of the door 3. Of these, the door lock lever 29 is for locking the closed door 3, and the illustrated position is the lock position, and the lock is released by rotating to the left from this position. I have. Operation panel 30
Has a switch input section 3 consisting of a start switch, etc.
1, a display unit 32 composed of LEDs and the like are provided.
Further, a control device 33 (see FIG. 4) constituting a control means is provided on the back of the operation panel 30.

The control device 33 controls the overall operation of the dishwasher, and is mainly composed of a microcomputer. As shown in FIG. 4, the control device 33 includes:
Switch input section 31 of operation panel 30, water level switch 2
0, signals from the door switch 34 responding to the opening and closing of the door 3 and the temperature sensor 19 are input. Then, the control device 33, based on those input signals and a preset control program, displays the display unit 32,
Buzzer 35, water supply valve 21, heater 4, fan motor 27
Are controlled via a drive circuit 36, and the pump motor 12 is controlled via an inverter circuit 13.

Next, the operation of the above configuration will be described. When washing dishes, the user first puts the dishes to be washed in the upper and lower dish baskets 7 and 8 with the door 3 opened, and stores them in the washing tank 2. The detergent is stored in a predetermined portion of the door 3. Then, when the door 3 is closed, the detergent is put into the cleaning tank 2. In this state, when the start switch of the switch input unit 31 on the operation panel 30 is operated, the control device 33 performs the operation based on a preset control program.

FIG. 1 shows a time chart in the standard course together with the temperature change of the washing water in the washing tank 2 and the rotation speed of the pump motor 12. In this FIG.
The hatched portions indicate the operating states of the respective devices. The rotation speed of the pump motor 12 is shown only when the cleaning pump 10 is operated.

When the operation is started, first, a cleaning step is executed. In the cleaning process, first, the water supply valve 21 is opened, and tap water is supplied into the cleaning tank 2 as cleaning water. When the washing water is supplied into the washing tank 2, the water is stored in the washing tank 2, and the water level in the washing tank 2 gradually rises. Then, when the water level in the washing tank 2 reaches a preset set water level H (see FIG. 1), this is detected by the water level switch 20, and based on this, the control device 33 closes the water supply valve 21 to operate the water supply valve 21. Stop supply.

Then, the heater 4 is energized to perform a heating operation, and the pump motor 12 is rotated forward to rotate the cleaning pump 1.
The cleaning operation is performed by operating 0. Of these, the heating operation of the heater 4 heats the washing water and raises the temperature (in this case, the initial temperature of the washing water (the temperature of tap water) is 20 ° C.), and the temperature of the washing water is The temperature is detected by a temperature sensor 19 on the outer bottom of the tank 2. Also,
When the cleaning pump 10 operates, the cleaning water in the cleaning tank 2 is sucked into the cleaning pump 10 from the water reservoir 9, and the sucked cleaning water is pumped to the cleaning arms 5 and 6 through the water supply unit 15 and the water supply pipe 16. The water is discharged from the ejection holes of the cleaning arms 5 and 6 to the tableware stored in the tableware baskets 7 and 8.

At this time, the pump motor 12 detects that the temperature detected by the temperature sensor 19 (the temperature of the washing water) is equal to the first set temperature (the set temperature in claim 3) in the previously set washing process. The cleaning pump 10 is operated at a relatively low rotation speed of 1500 rpm until the temperature rises to 40 ° C., which is a temperature at which the cleaning pump does not solidify. When the cleaning pump 10 operates at a low discharge pressure, the discharge pressure of the cleaning water discharged from the ejection holes of the cleaning arms 5 and 6 is low, and the cleaning water is applied to the dishes. In this case, since the discharge pressure of the washing water is weak, it is not enough to wash the dirt attached to the dishes, but the washing water is applied to the dishes, so that the dirt attached to the dishes swells, The dirt is in a state that is easy to remove.

The control device 33 controls the temperature sensor 19
Rises to the first set temperature (40 ° C.), the rotation speed of the pump motor 12 is increased from 1500 rpm to 3000 rpm. When the rotation speed of the pump motor 12 is increased to 3000 rpm, the cleaning pump 10 is operated at a high discharge pressure. Cleaning pump 10
Is operated at a high discharge pressure, the cleaning arm 5,
The discharge pressure of the cleaning water discharged from the ejection hole of No. 6 increases,
Dirt adhering to tableware is washed away by the flushing water that has been vigorously discharged.

When the temperature detected by the temperature sensor 19 rises to a second set temperature in the cleaning process, in this case, 60 ° C., the control device 31 turns off the heater 4 to stop the heating operation, The operation of the cleaning pump 10 is stopped by stopping the rotation of the motor 12. Thereafter, the pump motor 12 is rotated in the reverse direction to operate the drain pump 11, thereby draining the washing water in the washing tank 2 to the outside of the machine. Then, the water supply valve 21 is opened and the drain pump is opened. After the water supply / drainage is performed by performing the drainage operation of 11, the drainage is performed. Thus, the cleaning process is completed.

Next, a first rinsing step is performed.
In this rinsing step, first, water is supplied into the cleaning tank 2, and then the pump motor 12 is normally rotated at 3000 rpm to operate the cleaning pump 10 at a high discharge pressure, thereby performing a rinsing operation for one minute. . In this rinsing operation, the washing water is discharged from the ejection holes of the washing arms 5 and 6 to the tableware at a high discharge pressure, so that the detergent attached to the tableware is also dropped. Then, after the operation of the cleaning pump 10 is stopped, the drainage pump 11 is operated to perform drainage. Thus, the first rinsing process is completed.

Next, a second rinsing step is performed.
In this second rinsing stroke, in this case, exactly the same control as that of the above-mentioned first rinsing stroke is performed. When the second rinsing step is completed, a heating rinsing step is performed.

In the heating and rinsing step, first, the cleaning tank 2
After supplying water into the inside, the heating and rinsing operation is performed by turning on the pump motor 12 and operating the cleaning pump 10 while energizing the heater 4 to heat the cleaning water. In the heating and rinsing operation, the pump motor 12 raises the temperature detected by the temperature sensor 19 (the temperature of the washing water) to the first set temperature (the set temperature in claim 10) in the heating and rinsing step, in this case, 60 ° C. Until the cleaning pump 10 is driven at a relatively low rotational speed of 1500 rpm, the cleaning pump 10 is operated at a low discharge pressure.

The control device 33 controls the temperature sensor 19
Rises to the first set temperature (60 ° C.), the rotation speed of the pump motor 12 is increased from 1500 rpm to 3000 rpm, and the cleaning pump 10 is operated at a high discharge pressure. When the cleaning pump 10 operates at a high discharge pressure, the discharge pressure of the cleaning water discharged from the ejection holes of the cleaning arms 5 and 6 increases, and the dishes are rinsed by the cleaning water discharged vigorously. Become like

When the temperature detected by the temperature sensor 19 rises to the second set temperature in the cleaning process, that is, 80 ° C. in this case, the control device 33 turns off the heater 4 to stop the heating operation, The operation of the cleaning pump 10 is stopped by stopping the rotation of the motor 12. Thereafter, the pump motor 12 is rotated in the reverse direction to perform drainage by the drainage pump 11, then the water supply valve 21 is opened, and the drainage pump 11 is drained to supply and drain water. Thus, the heating and rinsing process is completed.

Next, a drying step for drying the dishes is performed. In this drying step, the heater 4 is operated intermittently, and the fan motor 27 of the blower 23 is continuously operated to send drying air into the washing tank 2 to dry the dishes.
At this time, the heater 4 repeats the control of, for example, energizing for 25 seconds and disconnecting for 35 seconds. This drying step is performed for about 20 minutes. When the drying process is completed, the display unit 32 and the buzzer 35 notify that the operation has been completed.

According to the first embodiment, the following effects can be obtained. First, in the cleaning process, until the temperature detected by the temperature sensor 19 (the temperature of the cleaning water) rises to the first set temperature (40 ° C.) in the cleaning process.
Since the number of revolutions of the pump motor 12 is set to be low (1500 rpm) and the cleaning pump 10 is operated at a low discharge pressure, the cleaning pump is always operated only at a high discharge pressure, compared to the conventional method. The operating noise can be reduced while the cleaning pump 10 is operated at a low discharge pressure. In addition, when the cleaning pump 10 is operated at a low discharge pressure, the amount of cleaning water sucked by the cleaning pump 10 from the cleaning tank 2 per unit time is reduced, so that the cleaning pump 10 operates at a high discharge pressure. The decrease in the water level in the cleaning tank 2 is smaller than in the case where the cleaning is performed, and the cleaning water can be heated while the heater 4 at the bottom of the cleaning tank 2 is immersed in the cleaning water. Thereby, the heating efficiency of the heater 4 with respect to the cleaning water can be improved, and the time for raising the temperature of the cleaning water can be reduced.

In this case, for example, the cleaning pump 10 may not be operated until the temperature detected by the temperature sensor 19 rises to the set temperature (40 ° C.). The dirt adhering to the surface sticks, and the dirt is difficult to remove. On the other hand, in the present embodiment, the cleaning pump 10 is operated at a low discharge pressure to raise the temperature while washing water is applied to the dishes, so that the dirt attached to the dishes is solidified. It is in a swollen state without wearing, and can be in a state in which dirt is easily removed.

When the temperature detected by the temperature sensor 19 ranges from the first set temperature (40.degree. C.) to the second set temperature (60.degree. C.) in the cleaning process, the rotation speed of the pump motor 12 is increased (3000 rpm). Set and wash pump 10
By operating at a high discharge pressure, tableware is washed with a high pressure water flow. Thereby, in a temperature zone where the protein is not hardened (about 40 to 50 ° C.) and a temperature zone where the oil or the like is melted (about 55 to 60 ° C.), the water is washed with a strong pressure water stream, so that effective washing is performed. It can be performed.

Similarly, in the heating and rinsing step, the number of revolutions of the pump motor 12 is set low until the temperature detected by the temperature sensor 19 rises to the first set temperature (60 ° C.) in the heating and rinsing step. Since the pump 10 is operated at a low discharge pressure, the operation noise can be reduced as compared with the conventional case where the cleaning pump is always operated only at a high discharge pressure. In addition, the water level in the cleaning tank 2 during the operation of the cleaning pump 10 is less likely to decrease, and the cleaning water can be heated while the heater 4 is immersed in the cleaning water. The efficiency can be improved, and the time for raising the temperature of the washing water can be reduced.

The temperature detected by the temperature sensor 19 is changed from the first set temperature (60 ° C.) in the heating and rinsing process to the second set temperature.
Up to the set temperature (80 ° C).
By setting the number of rotations of 2 high and operating the washing pump 10 at a strong discharge pressure, the dishes are rinsed with a water stream of a strong pressure, and the temperature at which the germs start to die is set at 60.
Since cleaning is performed with a water stream having a strong pressure from ℃, effective cleaning can be performed. In this case, since the temperature of the washing water is particularly increased by rinsing until the temperature detected by the temperature sensor 19 reaches 80 ° C., Escherichia coli and the like can be sufficiently killed, and sterilization can be surely performed.

Further, since the pump motor 12 for operating the cleaning pump 10 is constituted by a DC brushless motor and is controlled via the inverter circuit 13, the number of revolutions of the pump motor 12 can be easily controlled. ,
The discharge pressure of the cleaning pump 10 can be easily controlled.

FIG. 5 shows a second embodiment of the present invention. This second embodiment is an embodiment corresponding to the fourth and sixth aspects of the present invention and is characterized by the following points. Have. That is, in the cleaning process, the control device 33 operates the cleaning pump 10 at a weak discharge pressure until the temperature detected by the temperature sensor 19 rises to the first set temperature in the predetermined cleaning process, in this case, 40 ° C. (The number of revolutions of the pump motor 12 is 1500 rpm) and the first set temperature (40 ° C.)
After rising, the cleaning pump 10 is operated at a high discharge pressure for a predetermined time, in this case, 5 minutes (the rotation speed of the pump motor 12 is 3000 rpm). Until the temperature detected by the temperature sensor 19 rises to the second set temperature, in this case, 60 ° C., the cleaning pump 10 is again operated at the weak discharge pressure, and after the rise to the second set temperature (60 ° C.) In this case, the cleaning pump 10 is again operated at the strong discharge pressure for 5 minutes in this case, and the operation of the heater 4 and the cleaning pump 10 is stopped after 5 minutes.

At this time, the controller 33 controls the temperature sensor 1
A predetermined time (5 minutes) after the detected temperature of No. 9 rises to the first set temperature (40 ° C.) and the second set temperature (60 ° C.)
The heater 4 is controlled so that the set temperatures (40 ° C., 60 ° C.) are maintained for a predetermined time (5 minutes) after the temperature has risen to the maximum.

In the second embodiment, the same operation and effect as those of the first embodiment can be obtained in the cleaning process. In addition, in this case, the first set temperature is, for example, 40 ° C., which is a temperature at which the protein does not solidify.
By maintaining the temperature at which the protein does not solidify for a relatively long period of time, and by operating the cleaning pump 10 at a high discharge pressure during this time, it is possible to effectively clean the state in which the protein does not solidify. In addition, the second set temperature is set to a temperature at which, for example, oil stains are easily melted.
When the temperature is set to 0 ° C., the temperature at which oil stains and the like are easily melted is maintained for a relatively long time, and the cleaning pump 1
By operating 0 at a strong discharge pressure, oil stains and the like can be effectively cleaned.

FIG. 6 shows a third embodiment of the present invention. This third embodiment is an embodiment corresponding to the fifth and sixth aspects of the present invention, and the second embodiment described above. Is different from the following. That is, in the cleaning process, the cleaning is performed for 5 minutes after the temperature detected by the temperature sensor 19 rises to the first set temperature (40 ° C.) and for 5 minutes after the temperature is raised to the second set temperature (60 ° C.). Instead of operating the pump 10 at a high discharge pressure, the rotation speed of the pump motor 12 is alternately switched between 3000 rpm and 1500 rpm, so that the cleaning pump 10 is operated at an alternating high and low discharge pressure. .

In the third embodiment, the same operation and effect as those of the second embodiment can be obtained. In addition, in this case, by operating the cleaning pump 10 with alternately high and low discharge pressures, the cleaning water can be evenly applied to the tableware, thereby enabling more effective cleaning.

FIG. 7 shows a fourth embodiment of the present invention. This fourth embodiment is an embodiment corresponding to the seventh and ninth aspects of the present invention and has the following features. Have. That is, in the cleaning process, the cleaning pump 10 is operated at a weak discharge pressure until the temperature detected by the temperature sensor 19 rises to the first set temperature in the cleaning process, which is a predetermined temperature, in this case, 40 ° C. Rotation speed of 1500
rpm), and after rising to a first set temperature (40 ° C.)
The cleaning pump 10 is operated at a high discharge pressure until the temperature reaches a second set temperature higher than the first set temperature, in this case, 50 ° C. (the rotation speed of the pump motor 12 is 3000 rpm). ).

Then, the temperature detected by the temperature sensor 19 becomes the second temperature.
Of the third set temperature, which is higher than the second set temperature, in this case 5
Until the temperature rises to 5 ° C., the cleaning pump 10 is operated at a low discharge pressure, and after the temperature rises to the third set temperature (55 ° C.), the fourth pump set higher than the third set temperature is set. The cleaning pump 10 is operated at a high discharge pressure until the temperature reaches the set temperature, in this case 60 ° C., and the fourth set temperature (6
When the temperature reaches 0 ° C.), the operations of the heater 4 and the cleaning pump 10 are stopped.

In the fourth embodiment, the same operation and effect as those of the first embodiment can be obtained in the cleaning process. In the fourth embodiment, instead of operating the cleaning pump 10 at a high discharge pressure, the cleaning pump 10 may be operated at a high and low alternate discharge pressure. In this case, an embodiment corresponding to the eighth and ninth aspects of the present invention is provided.

FIG. 8 shows a fifth embodiment of the present invention. This fifth embodiment is an embodiment corresponding to the invention of claim 14, and has the following features. ing. That is, in the heating and rinsing process, the cleaning pump 10 is operated at a low discharge pressure until the temperature detected by the temperature sensor 19 rises to a preset temperature, in this case, 80 ° C. (the rotation speed of the pump motor 12 is 1500 rpm). ), After the temperature has risen to the set temperature (80 ° C),
The cleaning pump 10 is operated at a high discharge pressure for a minute (the rotation speed of the pump motor 12 is 3000 rpm), and after 5 minutes, the operations of the heater 4 and the cleaning pump 10 are stopped. At this time, the temperature detected by the temperature sensor 19 becomes the set temperature (80
5 minutes after the temperature rises to the set temperature (80 ° C.).
(° C.) is controlled.

In the fifth embodiment as well, almost the same operation and effect as in the first embodiment can be obtained in the heating and rinsing step. In this case, in particular, after the temperature detected by the temperature sensor 19 rises to the set temperature (80 ° C.), the temperature is maintained for 5 minutes, and the cleaning pump 10 is operated at a high discharge pressure. Etc. can be killed sufficiently, and sterilization can be performed more reliably.

FIG. 9 shows a sixth embodiment of the present invention. This sixth embodiment is an embodiment corresponding to the invention of claim 15, and differs from the fifth embodiment described above. The following points are different. That is, in the heating and rinsing process, for 5 minutes after the temperature detected by the temperature sensor 19 rises to the set temperature (80 ° C.), the cleaning pump 10 is operated at a high discharge pressure instead of operating the pump motor 12. Number 30
By alternately switching between 00 rpm and 1500 rpm, the cleaning pump 10 is operated at alternately high and low discharge pressures.

In the sixth embodiment, the same operation and effect as those of the fifth embodiment can be obtained. In addition, in this case, by operating the cleaning pump 10 with alternately high and low discharge pressures, the cleaning water can evenly hit the dishes, and the rinsing can be performed more effectively.

FIG. 10 shows a seventh embodiment of the present invention. This seventh embodiment is an embodiment corresponding to the invention of claim 10, and differs from the first embodiment described above. The following points are different. That is, in the first embodiment, in the two rinsing steps after the cleaning step, the cleaning pump 1 is used twice.
0 is operated at a strong discharge pressure (the rotational speed of the pump motor 12 is 3
However, in the seventh embodiment, the cleaning pump 10 is operated at a low discharge pressure in the first rinsing stroke of the two rinsing strokes (the rotation speed of the pump motor 12 is In the second rinsing stroke, the cleaning pump 10 is operated at a high discharge pressure.

In the seventh embodiment, the operating noise can be reduced by operating the cleaning pump 10 at a low discharge pressure in the first rinsing stroke of the two rinsing strokes. . In the seventh embodiment, in the second rinsing step, instead of operating the cleaning pump 10 at a strong discharge pressure, the cleaning pump 10 may be operated at a discharge pressure alternately strong and weak.

The present invention is not limited to the above embodiments, but can be modified or expanded as follows. In the heating and rinsing process of the first embodiment, the pump motor 12 is turned on until the temperature detected by the temperature sensor 19 rises to the first set temperature (60 ° C.) and then rises to the second set temperature (80 ° C.). May be alternately switched between 3000 rpm and 1500 rpm, and the cleaning pump 10 may be operated at alternately high and low discharge pressures. In this case, the present invention corresponds to the twelfth aspect of the present invention. The motor of the washing pump 10 and the motor of the drainage pump 11 may be different.

[0069]

As is clear from the above description, according to the present invention, the following effects can be obtained. Claim 1
According to the dishwasher, when the cleaning pump is operated while the cleaning water is heated by the heater, the discharge pressure of the cleaning pump is changed according to the temperature detected by the temperature sensor, so that the cleaning pump is always discharged strongly. Driving noise can be reduced as compared with the case of operating only with pressure. When the cleaning pump is operated at a low discharge pressure, the cleaning water can be heated while the heater at the bottom of the cleaning tank is immersed in the cleaning water. The efficiency can be improved.

According to the dishwasher of the second aspect, since the rotation speed of the motor can be easily controlled, the discharge pressure of the cleaning pump can be easily controlled. Claim 3,
According to the dishwashers 4 and 7, the same operation and effect as in claim 1 can be obtained in the washing step of operating the washing pump while heating the washing water with the heater to wash the dishes.

According to the dishwasher of the fifth and eighth aspects, the same operation and effect as those of the first aspect can be obtained in the cleaning step of cleaning the tableware by operating the cleaning pump while heating the cleaning water with the heater. In addition, the cleaning can be performed more effectively by operating the cleaning pump at alternately high and low discharge pressures.

In the dishwasher according to claim 6, for example, the first set temperature is set to about 40 ° C., which is a temperature at which the protein does not solidify, and this temperature is maintained for a relatively long time;
By operating the cleaning pump at an alternately high or low discharge pressure during this time, proteins and the like can be effectively cleaned. Further, the second set temperature is set to about 60 ° C., which is a temperature at which oil stains and the like are easily melted, and this temperature is maintained for a relatively long time. By operating, it becomes possible to effectively clean oil stains and the like.

According to the dishwasher of the ninth aspect, proteins and oil stains can be more effectively washed.
According to the dishwasher of the tenth aspect, the operation noise during the rinsing process can be reduced. According to the dishwasher according to the eleventh and fourteenth aspects, the same operation and effect as in the first aspect can be obtained in the heating and rinsing step in which the cleaning pump is operated and the rinsing is performed while the cleaning water is heated by the heater. .

According to the dishwasher of claims 12 and 15,
In the heating rinsing step of rinsing by operating the cleaning pump while heating the cleaning water with the heater, the same operation and effect as in claim 1 can be obtained. In addition, the cleaning pump can be operated with alternately strong and weak discharge pressures. By operating, cleaning can be performed more effectively. According to the dishwasher of the thirteenth aspect, sterilization can be performed more reliably in the heating and rinsing process.

[Brief description of the drawings]

FIG. 1 is a time chart showing a first embodiment of the present invention, showing a temperature change of cleaning water and a rotation speed of a pump motor.

FIG. 2 is a longitudinal sectional side view.

FIG. 3 is an external perspective view.

FIG. 4 is a block diagram showing an electrical configuration.

FIG. 5 shows a second embodiment of the present invention, and is a time chart of a washing process shown together with a change in temperature of washing water and the number of rotations of a pump motor.

FIG. 6 is a view corresponding to FIG. 5, showing a third embodiment of the present invention.

FIG. 7 is a view corresponding to FIG. 5, showing a fourth embodiment of the present invention.

FIG. 8 shows a fifth embodiment of the present invention, and is a time chart of a heating rinsing stroke shown together with a change in the temperature of washing water and the number of revolutions of a pump motor.

FIG. 9 is a view corresponding to FIG. 8, showing a sixth embodiment of the present invention.

FIG. 10 is a view corresponding to FIG. 1, showing a seventh embodiment of the present invention.

FIG. 11 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

2 is a cleaning tank, 4 is a heater, 5, 6 is a cleaning arm, 7, 8
Is a tableware basket, 10 is a washing pump, 11 is a drainage pump, 1
2 is a pump motor (motor), 13 is an inverter circuit,
19 is a temperature sensor, 21 is a water supply valve, 23 is a blower, 33
Indicates a control device.

Claims (15)

[Claims] 1. A washing tank for accommodating tableware, a heater provided at a bottom of the washing tank for heating washing water supplied to the washing tank, and sucking washing water in the washing tank. A cleaning pump for discharging the suctioned cleaning water to the dishes in the cleaning tank; a temperature sensor for detecting a temperature of the cleaning water; and a control unit for controlling the cleaning pump. A dishwasher, wherein a discharge pressure of the washing pump is changed according to a temperature detected by the temperature sensor. 2. The dishwasher according to claim 1, wherein the motor that operates the washing pump is a DC brushless motor, and is controlled by an inverter. 3. In a washing process of washing dishes by operating a washing pump while heating the washing water with a heater, the control means controls the temperature sensor until the temperature detected by the temperature sensor rises to a preset set temperature. 2. The dishwasher according to claim 1, wherein the cleaning pump is operated at a low discharge pressure, and after the temperature reaches the set temperature, the cleaning pump is operated at a high discharge pressure. 4. In a washing process of washing dishes by operating a washing pump while heating washing water by a heater, the control means increases a temperature detected by the temperature sensor to a first set temperature set in advance. Until the cleaning pump is operated at a low discharge pressure, after rising to the first set temperature, the cleaning pump is operated at a high discharge pressure for a predetermined time,
And operating the cleaning pump at a weak discharge pressure until the temperature detected by the temperature sensor rises to a second set temperature higher than the first set temperature,
2. The dishwasher according to claim 1, wherein the washing pump is operated at a high discharge pressure for a predetermined time after the temperature has risen to the set temperature. 5. In a washing process of washing dishes by operating a washing pump while heating washing water with a heater, the control means increases the temperature detected by the temperature sensor to a first preset temperature. Until the above, the washing pump is operated at a weak discharge pressure, and after rising to the first set temperature, the washing pump is operated at a strong and weak alternate discharge pressure for a predetermined time, and the temperature detected by the temperature sensor is lowered. The cleaning pump is operated at a low discharge pressure until the temperature reaches a second set temperature higher than the first set temperature, and after the temperature reaches the second set temperature, the cleaning is performed for a predetermined time. 2. The dishwasher according to claim 1, wherein the pump is operated at an alternating discharge pressure. 6. The control means maintains the set temperature for a predetermined time after the temperature detected by the temperature sensor has risen to the first set temperature and for a predetermined time after it has risen to the second set temperature. The dishwasher according to claim 4 or 5, wherein the heater is controlled so as to be controlled. 7. In a cleaning process of cleaning tableware by operating a cleaning pump while heating the cleaning water with a heater, the control unit increases the temperature detected by the temperature sensor to a first set temperature set in advance. Until the above, the cleaning pump is operated at a weak discharge pressure, after rising to the first set temperature, until the rise to a second set temperature higher than the first set temperature, The cleaning pump is operated at a high discharge pressure, and after rising to the second set temperature, the third set at a higher temperature than the second set temperature.
The cleaning pump is operated at a weak discharge pressure until the temperature rises to the third set temperature, and after rising to the third set temperature, the fourth set temperature set to be higher than the third set temperature 2. The dishwasher according to claim 1, wherein the cleaning pump is operated at a high discharge pressure until the pressure rises. 8. In the washing process of washing the dishes by operating the washing pump while heating the washing water with the heater, the control means raises the temperature detected by the temperature sensor to a first preset temperature. Until the above, the cleaning pump is operated at a weak discharge pressure, after rising to the first set temperature, until the rise to a second set temperature higher than the first set temperature, The cleaning pump is operated at alternately high and low discharge pressures, and after the temperature has risen to the second set temperature, the cleaning pump has the above-mentioned condition until it rises to a third set temperature higher than the second set temperature. The cleaning pump is operated at a low discharge pressure, and after the temperature has risen to the third set temperature, the cleaning pump is operated until the temperature rises to a fourth set temperature higher than the third set temperature. Alternating discharge pressure Dishwasher according to claim 1, wherein the operating. 9. The method according to claim 1, wherein the first set temperature is about 40 ° C., the second set temperature is about 50 ° C., the third set temperature is about 55 ° C., and the fourth set temperature is about 60 ° C. The dishwasher according to claim 7 or 8, wherein 10. A washing step for washing tableware by operating a washing pump while heating washing water by a heater, a plurality of rinsing steps, and rinsing by operating a washing pump while heating washing water by a heater. The heating rinsing step is performed in order, wherein the control means includes the last one of the plurality of rinsing steps.
The cleaning pump is operated at an alternately high or low discharge pressure during a single rinsing stroke, and the cleaning pump is operated at a low discharge pressure during at least one of the preceding rinsing strokes. The dishwasher according to 1. 11. A washing step for rinsing tableware by operating a washing pump while heating washing water by a heater, and a heating step for rinsing by operating a washing pump while heating washing water by a heater. In performing the rinsing step sequentially, the control means operates the cleaning pump at a weak discharge pressure until the temperature detected by the temperature sensor rises to a first preset temperature in the heating rinsing step, After the temperature rises to the first set temperature, the cleaning pump is operated at a strong discharge pressure until the temperature rises to a second set temperature higher than the first set temperature. The dishwasher according to claim 1. 12. A washing step for rinsing tableware by operating a washing pump while heating washing water by a heater, and a heating step for rinsing by operating a washing pump while heating washing water by a heater. In performing the rinsing step sequentially, the control means may control the temperature detected by the temperature sensor to a first preset value in the heating rinsing step.
The cleaning pump is operated at a low discharge pressure until the temperature rises to the first set temperature, and after the temperature rises to the first set temperature,
2. The dishwasher according to claim 1, wherein the washing pump is operated at alternately high and low discharge pressures until the temperature rises to a second set temperature higher than the first set temperature. 13. The dishwasher according to claim 11, wherein the first set temperature is about 60 ° C. and the second set temperature is about 80 ° C. 14. A washing step for rinsing tableware by operating a washing pump while heating the washing water with a heater, and a heating step for rinsing by operating a washing pump while heating the washing water with a heater. In performing the rinsing step sequentially, the control means operates the cleaning pump at a weak discharge pressure until the temperature detected by the temperature sensor rises to a preset temperature in the heating rinsing step, and 2. The dishwasher according to claim 1, wherein the cleaning pump is operated at a high discharge pressure for a predetermined time after the rise. 15. A washing step for rinsing tableware by operating a washing pump while heating washing water by a heater, and a heating step for rinsing by operating a washing pump while heating washing water by a heater. In performing the rinsing step sequentially, the control means operates the cleaning pump at a weak discharge pressure until the temperature detected by the temperature sensor rises to a preset temperature in the heating rinsing step, and 2. The dishwasher according to claim 1, wherein the washing pump is operated at an alternately high and low discharge pressure for a predetermined time after the rise.