JP2000350693A - Dish washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce electric power consumption by shortening the time of a hot water rinsing process, by rotatably driving a pump by an inverter control system motor, reducing a wash water quantity in the hot water rinsing process more than a washing process, reducing a rotating speed of the motor, and reversing the motor in a drain process. SOLUTION: In a dish washer 1, a tableware housing tank 4 is housed in an outer frame, and a cover 3 is arranged so as to open upward from this side. A pump 10 is arranged under the tableware housing tank 4 to be supported by a bottom plate 11. In this case, the pump 10 is driven by an inverter control system motor 12. A wash water quantity in a hot water rinsing process is reduced more than a washing process to shorten time for heating a water temperature up to a maximum temperature by a heater 15. Similarly, a rotating speed of the motor 12 is reduced more than the washing process to restrain a wash water delivery quantity of the pump 10 to reduce noise generated according to suction of air. The pump 10 is reversed in a drain process to drain residual water of a water storage part 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for washing with jetted washing water, and more particularly to the operation of a jetting pump.

[0002]

2. Description of the Related Art A series of steps in a dishwasher is generally performed in the order of "washing step", "water rinsing step", "hot water rinsing step", and "drying step". "Washing process"
The cleaning power depends on the temperature, the water pressure and the discharge amount of the cleaning water. The “hot water rinsing process” is also a preheating operation of the subsequent “drying process”, and has a maximum temperature of 65 ° C. to 80 ° C.
As it reaches a high temperature of about ℃, it also has an antibacterial effect.

[0003] In a washing water injection pump, when air is sucked in, the discharge amount of washing water is reduced and noise is increased.
Therefore, the supply amount of the cleaning water in each process is determined by the balance with the discharge amount of the cleaning water. Since the pump normally operates at the same rotational speed, the discharge amount of the washing water is constant in each stroke. In the “warm water rinsing process”, it takes time to further heat the same amount of cleaning water as in the “cleaning process” to a high temperature of 65 ° C. to 80 ° C., and the power consumption increases.

[0004] Further, in addition to the washing pump, it is necessary to provide a drainage pump for a drainage step performed after the "washing step", "water rinsing step", and "hot water rinsing step".

[0005]

DISCLOSURE OF THE INVENTION In view of the above problems, the present invention shortens the time of a "hot water rinsing step" to reduce power consumption and a dishwasher in which a washing pump also serves as a drain. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION The present invention provides a cleaning tank for cleaning tableware to be stored, a pump for pressurizing and discharging the cleaning water, a cleaning nozzle for jetting the pressurized cleaning water, and a cleaning nozzle for discharging the cleaning water. A heater for heating, water supply means for supplying cleaning water to the cleaning tank, a water level detector for detecting the amount of supplied cleaning water,
In a dishwasher provided with a control device for controlling operations of a washing step, a water rinsing step, a hot water rinsing step, and a drying step, an inverter-controlled motor is used as a rotary drive unit of the pump, and the pump is supplied in the hot water rinsing step. The amount of washing water is smaller than the washing step, and the number of revolutions of the motor is set lower than the washing step, the washing step,
The motor is rotated in a reverse direction in a draining step performed after the water rinsing step and the hot water rinsing step.

[0007]

Embodiments of the present invention will be described with reference to the drawings.

First, a description will be given with reference to FIGS. The appearance of the dishwasher 1 is formed by a box-shaped outer frame 2 and a lid 3. Inside the outer frame 2, a tableware storage tank 4 as a washing tank is arranged, and a lid 3 is provided so as to open upward from the front. A handle lever 5 is provided on the front side of the lid 3. The lid switch 6 is turned ON / O in conjunction with opening and closing of the lid 3.
The FF operation is performed, and a latch 7 for interlocking is provided. In the tableware storage tank 4, a lower basket 8 and an upper basket 9 for storing tableware are provided detachably.

A pump 10 is provided below the tableware storage tank 4, as shown in FIG. This pump 10 has a bottom plate 11
It is supported by. The pump 10 is driven by an inverter-controlled motor 12. The motor 12 is capable of linearly and freely changing the speed from a high speed to a low speed, and is capable of operating in a rotating direction freely. The operation of the pump 10 performs the operations of a washing process, a water rinsing process, a hot water rinsing process, and a drain process.

A blower unit having a fan 13 and a motor 14 and a heater 15 for increasing the water temperature and heating the blower are provided below the tableware storage tank 4.

[0013] Immediately below the lower basket 8, an arm nozzle 16 as a cleaning nozzle is provided. The arm nozzle 16 rotates around a central portion as a fulcrum. A plurality of small holes 17 are provided on the upper surface of the arm nozzle 16.

As shown in FIG. 4, a water supply solenoid valve 18 is arranged on the back of the tableware storage tank 4.

A front cover 19 is attached to the front of the tableware storage tank 4, and a controller 20 for controlling various electric components is arranged inside the front cover 19. The front cover 19 is provided with a lock release button 21 for releasing the closed state of the lid 3.

Here, the "washing step", "water rinsing step", "warm water rinsing step" and "drying step" of the dishwasher 1 having the above configuration will be described. First, in the “washing process”, the water supply electromagnetic valve 18 is opened to supply the tableware storage tank 4 with the wash water. The heater 15 is energized to warm the washing water and the pump 10 is operated. With the rotation of the pump runner 22, the washing water is sucked from the water reservoir 23 arranged at the bottom of the tableware storage tank 4, and the washing water is supplied into the arm nozzle 16 from the discharge port 24 of the pump 10. Then, the lower car 8, the car 9 through the small hole 17 of the arm nozzle 16.
By directly injecting washing water into the tableware inside, dirt attached to the tableware is peeled and dispersed. Arm nozzle 16
The washing water is sprayed over the entire area of the tableware storage tank 4, so that the dishes in the tableware storage tank 4 are washed.

After the above-described cleaning has been performed for a predetermined time, the power supply to the heater 15 is stopped, and the cleaning process is completed. Thereafter, the motor 12 is immediately rotated in the reverse direction. By the reverse rotation of the runner 22, the washing water in the tableware storage tank 4 is discharged outside the machine.

In the next water rinsing step, the pump 1 is normally turned off in the same manner as in the above-mentioned washing step, while the power supply to the heater 15 is stopped.
0 operation is performed. This operation of water rinsing is repeated several times of water supply / drainage. The hot water rinsing process is performed while heating the water temperature by the heater 15. In the operation of hot water rinsing, the temperature of the washing water reaches 65 ° C to 80 ° C.

In the last drying step, the blowing unit is operated while heating the air by the heater 15.
The dry air heated by the heater 15 is blown into the tableware storage tank 3 through the ventilation passage 25 to dry the tableware in the lower basket 8 and the upper basket 9 and the tableware storage tank 3, and through the exhaust port 26. To discharge outside the machine. In this drying step, the energization of the heater 15 is controlled so that ON / OFF is repeated so that the temperature in the tableware storage tank 3 does not exceed a predetermined temperature. Tableware is controlled to prevent deformation and breakage due to heat.

As described above, a series of operations including "washing step", "water rinsing step", "hot water rinsing step" and "drying step" are performed. In light of such driving,
The main part of the present invention will be described below.

First, the relationship between the amount of cleaning water and the rate of increase in water temperature will be described with reference to FIG. The relationship between the washing water and the water temperature rise rate is almost proportional when the heating capacity of the heater is the same, and the smaller the amount of water, the higher the water temperature rise rate.

Therefore, in the "hot water rinsing process", the time for heating the water temperature to the maximum temperature of 65 to 80 ° C. by the heater 15 can be shortened by reducing the amount of washing water from that in the "washing process". The time spent can be reduced.
Power consumption can be reduced.

In the "warm water rinsing process", the water level in the water reservoir 23 is reduced in order to reduce the amount of washing water, and the pump 10 sucks air to increase noise. Therefore, the motor 12
By lowering the rotation speed of the pump 10 from the "washing process" to suppress the discharge amount of the washing water from the pump 10, the air is not sucked into the pump 10, so that the noise rise of the pump 10 can be eliminated at the same time.

Incidentally, the washing water amount in the "warm water rinsing step" is 2.5 liters, and the rotation speed of the pump runner 22 is 2400 RPM. The washing water amount in the “washing process” is 3
In liter, the rotation speed of the pump runner 22 is 3100R
PM. The amount of washing water stored in the water reservoir 23 is detected by a water level sensor (not shown).
It is possible to supply an accurate amount of water, unlike the one that controls the opening and closing by time management.

The motor 12 for driving the pump 10 is
Since the variable speed motor is an inverter control type variable speed motor, the speed adjustment range is large, and even if the load of the pump runner 22 fluctuates, the motor can be operated while maintaining the specified speed.
Therefore, an increase in the operation noise can be suppressed by the operation at a stable speed.

In the draining process performed after the “washing process”, “water rinsing process” and “hot water rinsing process”, the pump 10 is turned in the opposite direction to remove the remaining water remaining in the water reservoir 23 after cleaning. It can be drained out. Pump 10
Is driven by an inverter-controlled variable speed motor that can rotate forward and reverse, and can be used as both a washing pump and a drainage pump by controlling the forward and reverse rotations of the pump runner 22. There is no need to separately prepare pumps and motors for drainage.

In addition, "washing process", "water rinsing process",
Rotational speed of pump runner 22 in “hot water rinsing stroke”
The various cleaning / rinsing configurations obtained by changing the value of 0 are extremely easy because the driving means is an inverter-controlled variable speed motor. At the beginning of the washing / rinsing, a variety of operation modes can be provided, such as fast rotation, slow rotation halfway, and fast rotation again at the end.

When the dishwasher is operated at night or early in the morning, it is convenient to perform a silent operation by lowering the rotation speed of the motor as a whole.

FIG. 5 is a sectional view showing the pump 10 from the viewpoints of cleaning and drainage.

A pump runner 22 is provided inside the pump 10.
Is provided. On the discharge port 24 side of the pump 10, a drain discharge port 5 is provided.
0 is formed by branching. A switching valve 52 is rotatably supported at the tip of the branch portion 51. Switching valve 5
When it is set to close the drain discharge port 50 by turning 2, it becomes a cleaning pump. Switching valve 52 is discharge port 2
When it is set to close 4, it becomes a pump for drainage. The switching operation of the switching valve 52 is performed prior to the operation of the pump. Switching valve 52 and pump runner 2
2 is provided with a separation guide plate.

As shown in the figure, when the switching valve 52 is set to the drain discharge port 50 side and the pump runner 22 is rotated in the direction of the arrow A, the cleaning water is discharged to the discharge port 24 and the pump for cleaning is operated. It becomes. Conversely, switching valve 52
When is set to the discharge port 24 side and is rotated in the direction of the arrow B, the washing water is discharged to the drain discharge port 50, and the drain pump is operated.

By changing the direction of rotation of the pump runner from one pump in this way, the pump can be used for washing and draining. Further, when the operation of the pump is started, the switching valves 52 in the respective set states are pushed by the pressure of the discharge water, so that the switching valves 52 do not malfunction during the operation.

[0031]

As described above, the present invention provides a washing tank for washing tableware to be stored, a pump for pressurizing and discharging washing water, a washing nozzle for jetting pressurized washing water,
A heater for heating the cleaning water, a water supply means for supplying the cleaning water to the cleaning tank, a water level detector for detecting an amount of the supplied cleaning water, and operation of the cleaning step, the water rinsing step, the hot water rinsing step and the drying step In a dishwasher provided with a control device for controlling the motor, an inverter-controlled motor is used as a rotary driving means of the pump, and in the hot water rinsing step, the amount of supplied washing water is smaller than that in the washing step, and A dishwasher, wherein the number of rotations is lower than the washing step, and a motor is rotated in a reverse direction in a draining step performed after the washing step, the water rinsing step, and the hot water rinsing step. .

As a result, the following advantages can be expected.

In the hot water rinsing step, the amount of washing water to be supplied is smaller than in the washing step, and the number of revolutions of the motor is lower than in the washing step. Therefore, the operation time of the hot water rinsing step is short, and power consumption can be reduced. In addition, noise rise due to air suction or the like can be suppressed. In addition, since the pump is used for drainage by rotating the motor in the reverse direction, a separate pump exclusively for drainage becomes unnecessary. Since the motor is an inverter-controlled variable speed motor, the pump can be operated at various speed modes as well as forward and reverse rotation.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is an external perspective view showing the entire appearance of a dishwasher.

FIG. 2, showing an embodiment of the present invention, is a longitudinal sectional view of a dishwasher.

FIG. 3 is a horizontal sectional view of a dishwasher according to an embodiment of the present invention.

FIG. 4 shows one embodiment of the present invention, and is a rear view of the dishwasher partially broken.

FIG. 5, showing an embodiment of the present invention, is a cross-sectional view of a pump.

FIG. 6 shows one embodiment of the present invention, and is a graph showing a cleaning water amount and a water temperature rise rate.

[Explanation of symbols]

3 ... Tableware storage tank (wash tank), 10 ... pump, 12 ... motor, 15 ... heater, 16 ... wash nozzle (arm nozzle), 22 ... pump runner.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tamotsu Kamori 1-1-1 Higashitagacho, Hitachi City, Ibaraki Prefecture Inside the Taga Headquarters, Electrical Equipment Division, Hitachi, Ltd. (72) Inventor Yasushi Shinko Hitachi, Ibaraki Prefecture 1-1-1, Higashitaga-cho, Hitachi, Ltd.Electrical Equipment Division, Hitachi, Ltd. Inside the Taga Headquarters Headquarters F term (reference) 3B082 BD01 BD02 BD04 BD05 BF02 BF05 DB02 DC02 DC04

Claims (3)

[Claims] 1. A cleaning tank for cleaning tableware to be stored, a pump for pressurizing and discharging cleaning water, a cleaning nozzle for spraying pressurized cleaning water, a heater for heating the cleaning water, and a cleaning tank. Water supply means for supplying cleaning water, a water level detector for detecting the amount of supplied cleaning water, a cleaning step, a water rinsing step,
In a dishwasher provided with a control device for controlling operations of a hot water rinsing step and a drying step, an inverter-controlled motor is used as a rotary drive unit of the pump, and in the hot water rinsing step, the amount of washing water to be supplied is larger than that of the washing step. And the rotation speed of the motor is set lower than that of the washing step, and the motor is rotated in the opposite direction in a draining step performed after the washing step, the water rinsing step and the hot water rinsing step. Dishwasher characterized by the following. 2. The dishwasher according to claim 1, wherein a discharge side of the pump is branched to the washing nozzle side and a drain port side, and a switching valve is provided. 3. The dishwasher according to claim 1, wherein in one of the washing step, the water rinsing step, and the hot water rinsing step, the number of revolutions of the motor is changed while the step is in progress. .