JP2808207B2 - Dishwasher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher, and more particularly to a control device for controlling the temperature of washing water in a tank to an appropriate temperature.

[0002]

2. Description of the Related Art Conventionally, this type of dishwasher has been disclosed in Japanese Patent Application Laid-Open No. 3-131221, for example, after the supply of washing water into a tank by a water supply device is completed. The temperature of the stored washing water is detected by a temperature sensor, and when the detected temperature is lower than a predetermined temperature, all of the washing water is discharged out of the machine by a drain pump, and then the washing water is supplied again into the tank. Is controlled to be equal to or higher than a predetermined temperature.

[0003] In addition to the above-mentioned dishwasher,
Water is supplied while detecting the temperature of the washing water by the temperature sensor, and at the same time, the washing water is discharged outside the machine by the drain pump until the washing water reaches the predetermined temperature or more, so that the temperature of the washing water becomes the predetermined temperature or more. Is controlled.

[0004]

However, in the case of the former, since the temperature of the washing water supplied from the water supply device at the start of the water supply is low, when the temperature of the washing water becomes higher than the predetermined temperature during one supply. However, when the temperature of the washing water at the end of the water supply is below the predetermined temperature, all of the washing water supplied to the tank is discharged , so that a large amount of washing water is wasted.
That and say there is a problem.

In the latter case, since the washing water is supplied and discharged at the same time, the washing water is hardly stored in the tank. Therefore, the temperature of the washing water is detected by a temperature sensor attached to the outer wall of the tank. Is difficult to detect accurately. Furthermore, as in the latter case, if the drainage is performed simultaneously with the supply of the washing water, the drainage pump will run idle because the drainage pump discharges more than the supply from the water supply device. Also, there is a problem that the drain pump is damaged. An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a dishwasher for supplying washing water at an appropriate temperature into a tank without wasting washing water.

[0006]

According to a first aspect of the present invention, there is provided a cleaning tank provided with a cleaning water from an external water supply source via a water heater in a tank provided in the cleaning tank. A washing device for circulating and supplying washing water in the tank into the washing tank to wash or rinse tableware contained in the washing tank; and a washing device stored in the tank. A drainage device that discharges water, and an electric control device that controls operations of the water supply device, the washing device, and the drainage device to repeatedly perform a one-cycle process including a water supply process, a washing or rinsing process, and a drainage process. In the dishwasher, a temperature sensor for detecting a temperature of the washing water supplied into the tank is provided in the electric control device, and a reference water level at which the level of the washing water in the tank is required for washing. Higher A water level detecting means for detecting that the water supply has started, and in the water supply process, controlling the water supply device to start water supply, and the water level is set in advance so that the water level of the washing water does not reach the reference water level from the start of the water supply. was by entering the detected temperature from the temperature sensor upon elapse of the predetermined time, the same temperature
Determines whether the temperature detection result is below or above the specified temperature
The same result indicates that the temperature detection result is lower than the predetermined temperature.
Drained predetermined time washing water in the tank by controlling the drainage device when it is determined that, before after discharge of the washing water
The water level of the washing water is higher than the reference water level by the water level detecting means.
Controls the water supply device when it is detected that it has become high
To stop the water supply, and the temperature is detected by the determination.
When the result is determined to be equal to or higher than the predetermined temperature, the cleaning
Water discharge control means for controlling the water supply device to stop water supply when the water level detection means detects that the water level of the washing water has become higher than the reference water level without discharging the water . It is in.

According to a second aspect of the present invention, in the dishwasher according to the first aspect, the tank is formed by projecting a part of a bottom wall of the washing tank downward. And the temperature sensor is arranged at the protruding portion.

[0008]

According to the first aspect of the present invention, in the water supply process, the water supply control means detects the temperature by the temperature sensor when a predetermined time has elapsed from the start of water supply by the water supply device. It was by entering the detected temperature of wash water stored in the tank, the temperature detection result
It is determined whether the temperature is lower than the predetermined temperature or higher. This size
The temperature detection result is determined to be lower than the predetermined temperature
When the water is drained, the drainage device is activated to flush the washing water in the tank.
Drain it outside the machine for a certain period of time, and then wash the water
The water level must be higher than the standard water level required for
At the time of detection by the discharge means,
Stop water. On the other hand, the temperature detection result
When it is determined that the temperature is equal to or higher than a predetermined temperature, the drainage of the washing water is performed.
The flushing water level is higher than the reference water level
When the water level is detected by the water level detection means,
Control the water supply device to stop water supply. The predetermined time, since the water level of the wash water from the start of the water supply is predetermined in the reference does not reach the water level time, washing water amount et accumulated in the tank is within the predetermined time, tank by the supply end not small compared to the savings amount of water is found accumulated in full to. Also,
Wherein if a predetermined time is also suitably Sadamere, small and the amount of water discharged in the predetermined time is also compared to the water volume Kudekiru.

As a result, wasteful discharge of washing water is reduced.
Te, can store the Jo Tokoro temperature or more of the wash water in the tank. In addition , energy for heating the cleaning water
The lugi efficiency can be improved. Et al is, the discharge of the washing water less than the predetermined temperature by the drainage device, the drainage device since is performed after a predetermined amount of washing water was Tsu the tank is not able to idle operation, Therefore drainage device is damaged Never.

According to the second aspect of the present invention, the washing water is stored in a tank provided with a part of the bottom wall of the washing tank protruding downward. In this state, the temperature of the washing water can be detected by the temperature sensor disposed at the protruding portion, so that an accurate temperature detection result is obtained. As a result, the drainage control device accurately determines whether to drain.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows an entire dishwasher.
The dishwasher has a box-shaped housing 10 and a box-shaped washing tank 20 integrally mounted inside the housing 10. This washing tank 20
The inside is configured as a washing room R, and the bottom wall 20a
Is formed so as to protrude downward, and a tank 21 is provided in which the horizontal area of the protruding portion 21a is smaller than the horizontal area of the bottom wall 20a so that water is stored in the protruding portion 21a. Further, the front of the washing tank 20 is opened and closed by a door 22, and the opening and closing of the door 22 enables the tableware 24 placed on the rack 23 to be taken in and out of the washing room R. . A supply pipe Q ₆ provided with a water supply valve 27 is attached to the back wall 20 b of the washing tank 20.
Furthermore the feed tube Q ₇ on the upstream side of the water supply valve 27 water heater 28, such as a water heater instantaneous gas is interposed. Water supply valve 27
Is opened by the excitation of the electromagnetic solenoid 27a, and supplies high-temperature washing water supplied from a water supply source (not shown) and heated by the water heater 28 to the tank 21 through the washing chamber R.

A temperature sensor 21b for detecting the temperature of the washing water supplied into the tank is mounted on the outer wall of the tank 21. The temperature sensor 21b is turned on when the temperature of the washing water is 60 ° C. or higher, and is turned off when the temperature is lower than 60 ° C.

A supply pipe Q ₁ is provided at the bottom of the tank 21.
There are connected, the supply pipe Q ₁ is branched at the middle,
It is connected to the suction side of the cleaning pump 31 and to the suction side of the drainage pump 32. The supply pipe Q ₁ is connected to the sub tank 33 via the supply tube Q ₂ at an intermediate portion of the wash pump 31 and drain pump 32.

[0014] washing pump 31 is connected to the lower washing nozzle 25 attached to the bottom wall 20a of the cleaning tank 20 through the supply pipe Q ₃ which is connected to the discharge side, feed tube Q
_The supply pipe Q ₄ branched from ₃ and extended above the washing tank 20
Is connected to the upper cleaning nozzle 26 attached to the upper wall 20c of the cleaning tank 20 through the upper surface. Then, the cleaning pump 31 starts operating by driving the electric motor 31a shown in FIG. 2, sucks the cleaning water in the tank 21, and sends it to the lower cleaning nozzle 25 and the upper cleaning nozzle 26 under pressure. Drainage pump 32, the discharge side is connected to the supply pipe Q ₅ which is extended in position outside, it starts to operate by driving the electric motor 32a shown in FIG. 2, to suck the cleaning water in the tank 21 Discharge to the right place outside the aircraft.

The sub tank 33 has a tank 2 at its bottom.
1, and houses therein a reference water level switch 33a. The reference water level switch 33a detects that the level of the cleaning water supplied into the tank 21 by opening the water supply valve 27 has reached the reference water level x _o , which is the height required for cleaning and the like. If the height is higher than the reference water level x _o , it is turned on, and if the water level is lower than the reference water level x _o , it is turned off.

Next, an electric control device for electrically controlling the dishwasher constructed as described above will be described with reference to the drawings. FIG. 2 shows a schematic circuit configuration of the device. The electric control device 40 includes a microcomputer 41.
U, ROM, RAM, water supply timer, washing and rinsing timer,
3 includes a drain timer, an I / O, and the like. When a DC voltage is supplied from a power supply circuit (not shown) according to an ON state of a power switch (not shown),
Then, execution of a computer program (hereinafter, referred to as a program) corresponding to the flowchart of FIG. 4 is started.

On the input side of the microcomputer 41,
The above-mentioned temperature sensor 21b is connected via the A / D converter 42, and the reference water level switch 33a is connected. The A / D converter 42 converts the detected analog signal from the temperature sensor 21b into a digital signal and supplies the digital signal to the I / O of the microcomputer 41.

On the output side of the microcomputer 41,
The electromagnetic solenoid 27a of the water supply valve 27 and the electric motor 31 of the cleaning pump 31 are connected via the drive circuits 43 to 45.
a and the electric motor 32a of the drainage pump 32 are connected. Each of the drive circuits 43 to 45 receives an output signal from the microcomputer 41 and
a, the electric motor 31a and the electric motor 32a are respectively driven.

Next, the operation of the embodiment configured as described above will be described. When the power switch is turned on after the rack 23 on which the tableware 24 to be washed is placed in the washing room R, the microcomputer 41 executes step 1 in FIG.
At 00, the execution of the program is started. After starting the execution of this program, the microcomputer 41 executes step 1
At 01, an initial setting process for setting various variables to initial values is executed. After the initial setting process, the microcomputer 41 performs a water supply routine at step 102.

The microcomputer 41 starts the water supply routine shown in FIG.
At 21, the electromagnetic solenoid 27 a of the water supply valve 27 is energized to open the water supply valve 27, and a water heater 28 is supplied from an external water supply source.
At the same time as supplying high-temperature clean cleaning water to the tank 21 through the cleaning chamber R through
Start the water supply timer set to seconds. This 15
Seconds set time is a predetermined time as the water level of the wash water does not reach the reference level x ₀ by water supply to the tank 21. When a predetermined amount of washing water is supplied into the tank 21 and the water supply timer counts up for 15 seconds, the microcomputer shifts the program to step 124 based on the determination of “YES” in step 123, and the temperature sensor 21b A temperature detection signal indicating the temperature T of the washing water in the tank detected by the step
It is determined whether or not the detected temperature T is equal to or higher than the set temperature 60 ° C. At this time, the temperature sensor 21b detects the tank 2 formed by projecting a part of the bottom wall 20a of the cleaning tank 20 downward.
Since the temperature detection is performed on the outer wall of the first protruding portion 21a and the washing water is stored in the protruding portion 21a, an accurate temperature detection result can be obtained. As a result, the determination as to whether or not to perform the drainage for 10 seconds described later is appropriately performed.

If the detected temperature T is lower than the set temperature of 60 ° C., the microcomputer 41 executes a drainage routine in step 126 based on the determination of “NO” in step 125 and performs cleaning for 10 seconds or less. Allow the water to drain out of the machine. During this draining operation, the supply of the washing water is continued through the water supply valve 27, and the washing water having a set temperature of 60 ° C. or more is stored in the tank 21 by draining for 10 seconds. When the wash water reaches a predetermined reference level x ₀ necessary for cleaning and the like, on signal is emitted from the reference water level switch 33a, receives this microcomputer 41 at step 127 determines a "YES" In step 128, the power supply to the electromagnetic solenoid 27a is stopped in
Is closed, and in step 129, the execution of the water supply routine ends. On the other hand, the temperature sensor 2 in step 124
If the detected temperature T of the washing water in Step 1b is equal to or higher than the set temperature of 60 ° C., the microcomputer 41 shifts the program to Step 127 without executing the drainage routine based on the determination of “YES” in Step 125, Perform the following steps as described above.

[0022] As described above, in the water supply routine detects the temperature T of the cleaning water before the water level of the water supply after the start wash water reaches the reference water level x _0, the wash water at less than 60 ° C. 10 Since the water is drained for a second, the discharge amount of the washing water can be suppressed low, and waste of the washing water can be prevented. Further, by reducing the discharge of the cleaning water, the energy for heating the cleaning water in the water heater 28 can be efficiently used, and the cleaning water having a temperature of 60 ° C. or more and not unnecessarily too high can be obtained. It can be stored in the tank 21. In the water supply routine, the drainage pump 32 drains the washing water stored in the tank 21, so that the drainage pump 32 does not run idle and the pump is not damaged.

Thus, the set temperature of 60 ° C.
When is stored until the reference water level x ₀ wash water above, the microcomputer 41 carries out a process of cleaning routine at step 103. The microcomputer 41 starts counting the time of the washing and rinsing timer set at 2 minutes, and also starts energizing the electric motor 31a. Electric motor 31a
, The cleaning pump 31 sucks the cleaning water containing the detergent in the tank 21 through the supply pipe Q ₁ and sends it to the upper and lower cleaning nozzles 25 and 26 through the supply pipes Q ₃ and Q _4. Then, the washing of the dishes is started by the washing water injected from the washing nozzles 25 and 26. At this time, since the temperature of the washing water is an appropriate temperature of 60 ° C. or more, washing of tableware is effectively performed. After two minutes have elapsed, when the cleaning rinsing timer counts up, the microcomputer 41 stops supplying power to the electric motor 31a and ends the cleaning routine.

Next, the microcomputer 41 performs a drainage routine at step 104. The microcomputer 41 starts counting the time of the drain timer set to 30 seconds and starts energizing the electric motor 32a. With the start of rotation of the electric motor 32a, the drain pump 32 discharges the dirty washing water in the tank 21 to an appropriate place outside the machine through the supply pipes Q ₁ and Q ₅ . When the drain timer counts up after 30 seconds, the microcomputer 4
1 stops power supply to the electric motor 32a and ends the drainage routine.

Next, the microcomputer 41 executes the water supply routine shown in FIG. 4 as described above in step 105, and supplies clean water having a temperature equal to or higher than the set temperature into the tank 21. The rinsing routine is executed for 30 seconds in the same manner as the cleaning routine. At this time, since the temperature of the washing water is an appropriate temperature of 60 ° C. or more,
Tableware is effectively rinsed. After the end of the rinsing routine, the microcomputer 41 executes a drainage routine in step 107 in the same manner as in step 104 to discharge the washing water to an appropriate place outside the machine.

Further, the microcomputer 41 repeatedly executes the water supply, rinsing, and draining routines executed in steps 105 to 107 in steps 108 to 110 to sufficiently perform the rinsing of dishes. Then, after the drainage routine ends in step 110, the microcomputer 41 ends the execution of the program in step 111.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional side view of a dishwasher according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of an electric control device of the dishwasher.

FIG. 3 is a flowchart of a “computer program” executed by the control circuit of FIG. 2;

FIG. 4 is a flowchart showing a water supply routine of FIG. 3 in detail.

[Explanation of symbols]

Reference numeral 20: cleaning tank, 21: tank, 21a: projecting portion, 21
b: temperature sensor, 24: tableware, 27: water supply valve, 27a
... electromagnetic solenoid, 28 ... water heater, 31 ... washing pump,
31a: electric motor, 32: drain pump, 32a: electric motor, 41: microcomputer, R: washing room, Q
₁ ~Q ₇ ... supply pipe.

Claims (2)

(57) [Claims] 1. A water supply device for supplying cleaning water from an external water supply source to a tank provided in a cleaning tank via a water heater, and circulating and supplying the cleaning water in the tank to the cleaning tank. A washing device for washing or rinsing tableware stored in the, a drainage device for discharging washing water stored in the tank, and a water supply process by controlling the operation of the water supply device, the washing device and the drainage device, A dishwasher provided with an electric control device for repeatedly performing one cycle of a washing or rinsing process and a draining process, wherein the electric control device detects a temperature of washing water supplied to the tank. A temperature sensor to perform, a water level detecting means for detecting that the water level of the cleaning water in the tank has become higher than a reference water level required for cleaning, and controlling the water supply device in the water supply process. Water supply Is started and receives the temperature detection result from the temperature sensor upon elapse level of the washing water is the predetermined reference time determined in advance so as not to reach the water level from the start of the feed water, the temperature detection
It is determined whether the result is lower than the predetermined temperature or higher.
Determine said detected temperature is lower than a predetermined temperature by determination
The washing water in the tank by controlling the drainage device is discharged a predetermined time when the constant, the water level after the discharge of the washing water
The water level of the washing water is higher than the reference water level by the detecting means.
When the water supply is detected, the water supply device is controlled to supply water.
The water is stopped, and the temperature detection result is
When it is determined that the temperature is equal to or higher than a predetermined temperature, the drainage of the washing water is performed.
Without performing out, the water level of the wash water is higher than the reference water level is detected by the water level detecting unit time
And a water supply control means for controlling the water supply device to stop water supply. 2. The dishwasher according to claim 1, wherein the tank is provided with a part of a bottom wall of the washing tank protruding downward, and the temperature sensor is arranged at the protruding part. A dishwasher characterized by that: