JP2573066B2 - Dishwasher - Google Patents

Description

The present invention relates to an improvement in a dishwasher.

(Prior art) Conventionally, in a dishwasher of this type, in a washing cycle corresponding to the first cycle, hot water is supplied as cleaning water by a hot water supply valve through a cleaning chamber through a cleaning water tank located at the bottom of the cleaning chamber. At the end of hot water supply, the cleaning water in the cleaning water tank is pumped up by the cleaning pump, injected and circulated from the cleaning nozzle into the cleaning chamber, and the circulating cleaning water is mixed with a detergent, and then the dishes are washed. Is discharged by a discharge pump, and in the subsequent several rinsing cycles, the same process as the above-described cleaning cycle is repeated without detergent to rinse the dishes, and the cleaning water used in the final rinsing cycle is used for cleaning in the next cleaning cycle. Some are used as they are (see, for example, JP-A-57-175338).

(Problems to be Solved by the Invention) However, in the above-mentioned conventional apparatus, when a new dish is to be washed after a long time has elapsed since the completion of the previous dish washing, the hot water in the washing hot water tank is not used. There was a problem that the temperature of the dish was too low and the dishes were hard to remove. Further, if the hot water used for the last rinse is left in the cleaning water tank for a long time, there is a problem that the residue precipitates and adheres to the bottom wall of the tank.

The present invention has been made to address the above problems,
It is an object of the present invention to provide a dishwasher in which the problems of the washing water temperature and residues are solved.

(Means for Solving the Problems) In order to achieve the above object, the structural features of the first invention described in claim 1 are, as shown in FIG. 1A, a washing room 1a for accommodating tableware. A washing nozzle 1b provided in the washing chamber 1a for injecting hot water toward tableware, a washing water tank 1c provided at the bottom of the washing chamber 1a for storing hot water, and a washing hot water tank
Filter member 1d assembled on top of 1c and cleaning water tank
Hot water supply valve 2a that controls hot water supply to 1c, and cleaning pump 2b that pumps hot water in cleaning water tank 1c and supplies it to cleaning nozzle 1b
And a discharge pump that discharges the hot water in the cleaning water tank 1c to the outside
2c and a washing start switch 3 for instructing to start washing the dishes
And the washing water tank in response to the operation of the washing start switch 3.
A series of controls for operating the washing pump 2b and the discharge pump 2c in this order for a predetermined period of time each time the hot water supply valve 2a is opened until the hot water is filled on condition that the hot water is not filled in 1c a predetermined number of times. In the dishwasher provided with the first control means 4 which repeats and at the end of the predetermined number of times only omit the operation of the discharge pump in the series of controls, the temperature for detecting the temperature of the hot water in the cleaning hot water tank 1c. When the temperature of the detected hot water becomes lower than a predetermined temperature after the series of controls is repeated a predetermined number of times by the sensor 5 and the first control means 4, the cleaning pump 2b and the discharge pump 2c
And a second control means 6 for operating the components in this order for a predetermined time.

Further, as shown in FIG. 1B, the structural feature of the second invention described in claim 2 is that the first control means 4 replaces the temperature sensor 5 and the second control means 6 of the first invention. The timer means 7 measures the time after the series of control is repeated a predetermined number of times, and the cleaning pump 2b and the discharge pump 2c are respectively controlled in this order when the time measured by the timer means 7 reaches a predetermined time. The second control means 8 which operates every time is provided.

(Operation and Effect of the Invention) In the first invention configured as described above, the cleaning chamber 1a
When the washing start switch 3 is operated by putting dirty dishes and detergent in the inside, the first control means 4 supplies hot water until the hot water is filled in the washing hot water tank 1c on condition that the hot water is not filled. After opening the valve 2a, a series of controls for operating the cleaning pump 2b and the discharge pump 2c in this order for a predetermined period of time are repeated a predetermined number of times. Therefore,
The hot water is supplied into the cleaning water tank 1c, the cleaning water is injected into the dishes by the cleaning nozzle 1b, and the cleaning water is discharged from the cleaning water tank 1c in this order, and the tableware contains the detergent by the first series of controls. After being washed with washing water, the dishes are rinsed with detergent-free washing water by a series of subsequent controls. Further, since the first control means 4 omits the operation of the discharge pump in the last series of controls, the hot water finally used for rinsing remains in the cleaning hot water tank 1c. After a short time has passed since the washing of the tableware, while the temperature of the hot water in the cleaning hot water tank 1c is still high, the second
Since the control means 4 does not operate the cleaning pump 2b and the discharge pump 2c, the hot water in the cleaning water tank 1c is stored as it is. Then, when the washing start switch 3 is operated again in such a state, the hot water supply valve 2a is not opened, and the hot water remaining in the tank 1c is used for washing new dishes. As described above, within a short time after the previous dishwashing, the temperature in the washing water tank 1c is maintained at a certain high level, and the hot water is used for the last rinse and is not dirty. Therefore, in this case, washing water can be saved.

On the other hand, when a long time elapses after washing the tableware, the temperature of the hot water in the cleaning hot water tank 1c decreases. Then, when the temperature of the hot water detected by the temperature sensor 5 becomes lower than the predetermined temperature, the second control means 6 operates the cleaning pump 2b and the discharge pump 2c in this order for a predetermined time. As a result, the hot water (or water) that has become lower than the predetermined temperature in the cleaning water tank 1c is discharged to the outside after refluxing the cleaning nozzle 1b, the cleaning chamber 1a, the filter member 1d, and the cleaning water tank 1c. Due to the reflux of the hot water (or water) in the cleaning hot water tank 1c, the residue precipitated in the cleaning hot water tank 1c remains in the filter member 1d or is discharged to the outside. As a result, only the residue remaining on the filter member 1d is removed, and the residue settled in the cleaning hot water tank 1c does not adhere to the bottom wall of the tank 1c, and the cleaning hot water tank 1c becomes dirty due to the accumulation of the residue. Will not go. Next, when the washing start switch 3 is operated to perform a new dishwashing operation, the first control means newly opens the hot water supply valve 2c to supply hot water to the washing hot water tank 1c. The dishes will be washed with hot water. As a result, the tableware can be satisfactorily cleaned with high-temperature hot water without requiring the user to perform a new hot water supply operation.

In the second aspect of the present invention, the timer unit 7 measures the time from the previous dishwashing completion instead of the hot water temperature. Then, when the measured time reaches a predetermined time, the second control means 8 operates the cleaning pump 2b and the discharge pump 2c for a predetermined time. Since the measurement of this time corresponds to measuring that the temperature of the hot water in the cleaning water tank 1c of the first invention has become low, in the second invention, the next dishwashing can be performed within a short time from the previous dishwashing. When washing is performed, the hot water in the washing water tank 1c is used for washing the next tableware, thereby saving washing water. Also, if a long time has passed since the last dishwashing, the hot water (or water) in the washing water tank 1c is recirculated, so that the washing water tank 1c
The residue settled inside does not adhere to the bottom wall of the tank 1c, and the washing water tank 1c does not become dirty due to the accumulation of the residue. In addition, when the dishes are washed next time, new hot water is supplied to the washing water tank 1c, so that the dishes are washed with high-temperature water containing a detergent, and the user is provided with a special hot water supply. The high temperature hot water cleans the dishes without any operation.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIGS. 2 and 3 show the entire configuration of a dishwasher according to the present invention. As shown in FIG. 2, a main body of the dishwasher (hereinafter, referred to as a main body B) is a washing chamber integrally formed in an upper portion of an inner wall of the housing 10 in the housing 10.
The cleaning chamber 20 has a hot water supply valve 30
Is installed. Hot water supply valve 30 has its solenoid Sv
(See FIG. 3) selectively opened, and hot water of 80 (° C.) or more from a hot water supply source (not shown) is passed through the cleaning chamber 20 and extends downward from the left side of the bottom wall of the cleaning chamber 20. It is supplied as washing water into the washing water tank 21 that is discharged. In FIG. 2, reference numeral 22 indicates a scourer (filter member).
Indicates a heat insulating material.

A cleaning pump 40 is attached to the center of the peripheral wall of the cleaning hot water tank 21 via a heat insulating material 23.
Driven by a cleaning motor Mp coaxially mounted on the cleaning pump 40, the cleaning water in the cleaning water tank 21 is pumped up, and the cleaning water is supplied from a cleaning nozzle 50 pivotally supported at the center of the bottom wall of the cleaning chamber 20. The tableware 70a, 70b, 70c placed on the washing shelf 60 is washed by jetting and circulating in the washing room 20. The discharge pump 80 is driven by a discharge motor Md coaxially mounted on the discharge pump, and extends along a pipe 21 extending from the bottom of the peripheral wall of the washing water tank 21.
The cleaning water in the cleaning water tank 21 is drawn out through a
And discharged from the discharge pipe 24. Note that the discharge pipe 24 is
It also plays a role in draining the overflow water of the washing water in 20.

Next, the electric circuit configuration of the present embodiment will be described with reference to FIG. 3. The operation circuit 90 has a normally-open type push button type cleaning start switch 91. One end is grounded, and the other end is connected via a resistor 92 to the positive terminal of a DC power supply (not shown). Thus, when the cleaning start switch 91 is closed, the operation circuit 90
A cleaning start signal is generated at a low level from a common terminal (hereinafter referred to as an output terminal 93) of the cleaning start switch 91 and the resistor 92. The cleaning start signal is supplied to the cleaning start switch 91.
Disappears with the opening of.

The hot water level detection circuit 100 has a normally-open type float switch 101, and the float switch 101 is operably interposed in the die 22 (see FIG. 2). Further, as shown in FIG. 3, the float switch 101 is grounded at one end, and the other end of the float switch 101 is
It is connected via a resistor 102 to the positive terminal of the DC power supply. When the washing water in the washing water tank 21 reaches a predetermined level La or more corresponding to a full state, the float switch 101 is closed by the operation of the float. Also,
When the cleaning water in the cleaning water tank 21 decreases below the predetermined level La, the float switch 101 is opened by returning the float to a non-operating state. Therefore, when the float switch 101 is closed, the hot water level detection circuit 100 generates a hot water level detection signal at a low level from a common terminal (hereinafter, referred to as an output terminal 103) of the float switch 101 and the resistor 102. Also, the hot water level detection signal is supplied to the float switch 10
It disappears with the opening of 1.

The hot water detection circuit 110 has a temperature sensor 111, which is directly fixed to the peripheral wall of the cleaning hot water tank 21, as shown in FIG. In addition, the temperature sensor 11
As shown in FIG. 3, 1 is grounded at one end, and the other end of the temperature sensor 111 is connected to the positive terminal of the DC power supply via a resistor 112. Thus, the temperature detection circuit 110 outputs the DC voltage (+ Vc) from the DC power supply according to the temperature detected by the temperature sensor 111 in the cleaning water tank 21.
The voltage is divided by the temperature sensor 111 and the resistor 112, and the result of the voltage division is used as a temperature detection signal of a level corresponding to the actual temperature of the cleaning water in the cleaning water tank 21, and the temperature sensor 111 and the resistance 1
It is generated from a common terminal with the terminal 12 (hereinafter referred to as an output terminal 113).

The microcomputer 120 includes an operation circuit 90 and a hot water level detection circuit 100 in accordance with the flowcharts shown in FIGS.
In cooperation with the temperature detection circuit 110, the computer program is executed, and during this execution, the drive circuits 130, 14 connected to the relay coils 130a, 140a, 150a, respectively.
The arithmetic processing necessary for the drive control of 0,150 is performed. However, the above-mentioned computer program is the microcomputer 120
Is stored in advance in the ROM. Each drive circuit 130,140,150
Selectively excites each of the relay coils 130a, 140a, 150a under the control of the microcomputer 120.

The normally open relay switch 130b constitutes a relay together with the relay coil 130a.
It is closed only under the excitation of the relay coil 130a, and a power supply voltage from the commercial power supply Ps is applied to the solenoid Sv to excite it.
The normally open relay switch 140b constitutes a relay together with the relay coil 140a.The relay switch 140b is closed only under the excitation of the relay coil 140a, and applies a supply voltage from the commercial power supply Ps to the control motor Mp. Drive this. Also, the normally open relay switch 150b constitutes a relay together with the relay coil 150a.
Is closed only under the excitation of the relay coil 150a and the commercial power supply Ps
Is supplied to the discharge motor Md to drive it.

In this embodiment configured as above, if the microcomputer 120 is operated and a cleaning start signal is generated from the operation circuit 90, the microcomputer 120 starts executing the computer program in step 200 according to the flowchart of FIG. Then, initialization is performed in step 210, a cleaning start signal from the operation circuit 90 is read in step 220, and based on the read content, “Y
ES ”, and advances the computer program to the cleaning control routine 240.

Then, the microcomputer 120 starts execution of the cleaning control routine 240 in step 240 (see FIG. 5), and in step 241 generates a solenoid excitation output signal necessary for exciting the solenoid Sv of the hot water supply valve 30. In response, the drive circuit 130 excites the relay coil 130a, the relay switch 130b is closed, the hot water supply valve 30 is opened by the excitation of the solenoid Sv, and the hot water from the hot water supply source is put into the cleaning hot water tank 21. Supply as washing water. Thus, during the repetition of the determination of “NO” in step 243, the hot water level detection circuit
When 100 generates a hot water level detection signal, the microcomputer 120 reads the hot water level detection signal in step 242, and determines “YES” in step 243 based on the read result,
At step 243a, the solenoid excitation output signal is extinguished. Therefore, the drive circuit 130 demagnetizes the relay coil 130a based on the disappearance, the relay switch 130b is opened, the hot water supply valve 30 is closed by the demagnetization of the solenoid Sv, and the hot water supply from the hot water supply source to the washing room 20 is stopped. I do. As a result, the cleaning water tank 21 is kept full of cleaning water. In addition,
The predetermined level La in step 243 is stored in the ROM of the microcomputer 120 in advance.

After the arithmetic processing in step 243a, the microcomputer 120 generates a washing output signal necessary for driving the washing motor Mp and starts a timer (built-in to the microcomputer 120) in step 243b. Then, the drive circuit 140 excites the relay coil 140a in response to the cleaning output signal from the microcomputer 120, the relay switch 140b is closed, and the cleaning pump 40 is driven by the cleaning motor Mp.
The cleaning water in the cleaning hot water tank 21 is pumped up and is circulated from the cleaning nozzle 50 into the cleaning chamber 20 by jetting. Thereby, each tableware 70a-70b is washed with the washing water mixed with the detergent. In addition, the timer starts counting by the reset start.

Thus, the counted value T of the timer is equal to the predetermined cleaning time Tp.
When the value reaches (prestored in the ROM of the microcomputer 120), the microcomputer 120 determines “YES” in step 244 based on the determination that the cleaning is completed, and outputs a cleaning output signal in step 244a. In response to this, the drive circuit 140 demagnetizes the relay coil 140a and the cleaning pump 4
0 stops the pumping of the cleaning water by stopping the cleaning motor Mp with the opening of the relay switch 140b.

Thereafter, the microcomputer 120 executes the step 244b.
, A discharge output signal necessary for driving the discharge motor Md is generated, and the timer is reset and started. Then, the drive circuit 150 excites the relay coil 150a in response to the discharge output signal from the microcomputer 120, the relay switch 150b is closed, the discharge pump 80 is driven by the discharge motor Md, and The cleaning water is drawn out and discharged from the pipe 81 and the discharge pipe 24. Further, the timer starts counting time by the start of the relay. Then, the count value T of this timer is equal to the predetermined discharge time Td (microcomputer).
(Prestored in the ROM 120), the microcomputer 120 proceeds to step 245,
In step 245a, the discharge output signal is extinguished, the drive circuit 150 demagnetizes the relay coil 150a, and the discharge pump 80 is cleaned by stopping the discharge motor Md when the relay switch 150b is opened. Stop discharging hot water.

When the execution of the cleaning control routine 240 is completed in this manner, the microcomputer 120 advances the computer program to the rinsing control routine 250 (see FIG. 4). Then, the microcomputer 120 starts the execution of the rinsing control routine 250 in step 250a according to the flowchart in FIG. 6, and in each of steps 251 to 254a, the arithmetic processing in each of steps 241 to 244a (see FIG. 5). A similar operation is performed. By this, hot water supply valve
After the supply of the cleaning water to the cleaning water tank 21 via the cleaning water tank 30 is performed, the cleaning water pumped from the cleaning water tank 21 by the cleaning pump 40 is supplied from the cleaning nozzle 50 to the cleaning chamber 20.
The tableware 70a to 70c is sprayed and circulated in the table, and rinses without detergent.

When the rinse control routine 250 proceeds to step 254b, the microcomputer 120 updates the number-of-times data N, which has been initialized to zero in step 210, to “1”, and in step 255, sets “NO” based on N = 1. Judgment, after that, each step 25
In 5a to 256a, the same arithmetic processing as the arithmetic processing in each of steps 244b to 245b is performed. Thus, the cleaning water in the cleaning water tank 21 is discharged by the discharge pump 80 in the same manner as described above.

When the discharge of hot water at the time of the first rinsing is completed in this way, the microcomputer 120 again performs the arithmetic processing in each of the steps 215 to 254b, and the tableware 70a to 70c
Is performed in the same manner as described above. Then
When the rinsing control routine 250 proceeds to step 254b, the microcomputer 120 updates N = 2 in step 254b, and determines “YES” based on N = 2 in step 255. In other words, the microcomputer 120 has N = 2
Assuming that the condition is satisfied, the rinsing control routine 250 prohibits the transition from step 255 to step 255a, and then proceeds to step 220 (see FIG. 4). For this reason, each tableware 70a
The cleaning water used for the second rinsing of 7070c remains stored in the cleaning water tank 21 except for the portion that has flowed out of the discharge pipe 24 during rinsing. Further, the temperature of the cleaning water in the cleaning water tank 21 gradually decreases during the rinsing of the dishes 70a to 70c, and drops to around 60 ° C. at the end of the rinsing.

At this stage, if the cleaning start signal from the operation circuit 90 is still generated, the microcomputer 120
However, in the same manner as described above, after determining “YES” in step 230, the processing shifts to execution of the cleaning control routine 240. In addition, at this time, instead of the above-described dishes 70a to 70c, another dish to which dirt that is difficult to remove at high temperature is attached is placed on the washing shelf 60. The microcomputer 120
However, in the same manner as described above, the arithmetic processing in steps 241 to 243a is performed according to the flowchart of FIG.
Replenish the shortage of washing water in 1. As a result, the cleaning water tank 21 is kept full of the cleaning water at about 60 ° C.

After that, the microcomputer 120 sets each step 243b.
And 244a in the same manner as above.
The cleaning pump 40 cleans the cleaning water in the cleaning water tank 21 with the cleaning nozzle.
Inject and circulate from 50 into the cleaning chamber 20. For this reason, the other tableware is washed with washing water at about 60 ° C. with detergent mixed therein. As a result, dirt that is difficult to remove at high temperatures attached to the other tableware can be easily and reliably removed. After the cleaning in this manner, the microcomputer 120 performs the arithmetic processing in each of the steps 244b to 245a and the arithmetic processing in the rinsing control routine 250, and achieves the same discharge of the washing water and rinsing as described above.

As can be understood from the above description, paying attention to the fact that the temperature of the cleaning water used for the second rinsing drops to about 60 ° C. at the end of the rinsing, the cleaning water tank 21 is discharged without discharging the cleaning water. To be used for washing the next dish with detergent mixed, so it is not only useful to save washing water, but also at the temperature (around 60 ° C) suitable for detergent mixed with detergent when washing dishes. Secure washing water, and
When rinsing tableware, temperature suitable for rinsing (around 80 ° C)
The washing water can be secured, and the dirt which is difficult to remove at high temperature of the tableware and the rinsing with sterilization can be surely realized.

If the determination in step 230 is “NO” after the determination of “YES” in step 255, the microcomputer 120 shifts to the execution of the temperature determination routine 260 (see FIG. 4). Then, the microcomputer 120 starts the execution of the hot water temperature determination routine 260 in step 260a according to the flowchart of FIG. 7, and reads the hot water amount detection signal from the hot water temperature detection circuit 100 in step 261. At this stage, if the hot water level detection signal has not been generated from the hot water level detection circuit 100, the microcomputer 120 determines “NO” in step 262 and proceeds to the arithmetic processing in step 220.

On the other hand, if the determination in step 262 is “YES”, the microcomputer 120 converts the value of the temperature digital signal from the temperature detection circuit 110 into a digital temperature D in step 262a, and this digital temperature D the comparing determines a reference temperature D ₀ and step 263. However, the reference temperature D ₀ is stored in advance in the ROM of the microcomputer 120 as a value around 60 ° C.. Thus, if D ≧ D ₀ holds, based on the determination that the temperature of the cleaning water in the cleaning water tank 21 maintains a value of about 60 ° C.,
The microcomputer 120 determines "NO" in step 263.

On the other hand, if D <D ₀ is satisfied, the microcomputer 120 determines that the temperature of the cleaning water in the cleaning water tank 21 has decreased to a value not suitable for cleaning, and the At 263, "YES" is determined, and at step 263a, a cleaning output signal is generated and the timer is reset and started. Then, the cleaning pump 40 is connected to the microcomputer
In response to the cleaning output signal from 120, the cleaning nozzle is driven in the same manner as described above to pump the cleaning water in the cleaning water tank 21 and clean the nozzle.
Inject and circulate from 50 into the cleaning chamber 20. At this time, the cleaning water in the cleaning water tank 21 flows toward the suction port of the cleaning pump 40 and floats sediments (residues, etc.) on the bottom wall in the cleaning water tank 21. Most of the residue in the cleaning water tank 21 will accompany the cleaning water injected into the cleaning water 20. Therefore, the jet circulating cleaning water in the cleaning chamber 20 returns to the cleaning water tank 21 while leaving the above-mentioned residue on the dice 22.

Thereafter, if the determination in step 264 is “YES” as in step 245, the microcomputer 120 eliminates the cleaning output signal in step 264a, stops the cleaning pump 40 in the same manner as described above, Step 26
In 4b to 265a, the same arithmetic processing as the arithmetic processing in each of steps 255a to 256a is performed. For this reason, the washing water stored in the washing water tank 21 after the second rinsing is automatically discharged by the discharge pump 80 in the same manner as described above. Therefore, the washing water in the washing water tank 21 whose temperature has been unnecessarily lowered can always be automatically prevented from being erroneously used for the subsequent dishwashing. Prior to the discharge of the washing water, the deposits and the like on the bottom wall in the washing water tank 21 are put in a floating state as described above and remain on the scoop 22 through the arithmetic processing in steps 263a to 264a. Therefore, the floating residue in the cleaning water tank 21 is discharged together with the cleaning water after the above-described discharge of the cleaning water as described above, and the residue on the veneer 22 is removed by removing and cleaning the veneer 22. Therefore, the sediment adhesion residue hardly remains in the cleaning water tank 21, and the dirt in the cleaning water tank 21 can be removed only by simple cleaning.

Next, a modification of the above embodiment will be described. In this modification, a part of the flowchart of FIG. 6 is changed as shown in FIG. 8, and the flowchart of FIG. 7 is changed as shown in FIG. The change has a structural feature. The other configuration is substantially the same as that of the above-described embodiment except that the temperature detection circuit 110 is omitted.

In this modified example configured as described above, similarly to the above-described embodiment, when the computer program proceeds to step 255 (see FIGS. 6 and 8) of the rinsing control routine 250, a determination of "YES" is made. Then, the microcomputer 120 determines in step 255b that another timer (hereinafter referred to as
The second timer is called a reset timer. As a result, the second timer starts measuring time. The second timer is built in the microcomputer 120.

Thereafter, similarly to the above-described embodiment, when the computer program proceeds to step 262 (see FIGS. 7 and 9) of the hot water temperature determination routine 260 and determines "YES", the microcomputer 120 Shifts to the determination in step 263A. Thus, the count value T of the second timer
If α is less than the predetermined time Tα ₀ (= 60 minutes), the microcomputer 120 determines that the temperature of the cleaning water in the cleaning water tank 21 has maintained a value of about 60 ° C. It is determined as “NO” in step 263A, and the process proceeds to an arithmetic process in step 220. On the other hand, if the T [alpha ≧ T [alpha ₀ is satisfied, based on the judgment that the temperature of the washing water in the washing water tank 21 is lowered to not suitable for washing temperature, the microcomputer 120, to step 263A To determine "YES",
The arithmetic processing in each of the steps 263a to 265a is performed in the same manner as in the above embodiment. Therefore, the washing water stored in the washing water tank 21 after the second rinsing is automatically discharged by the discharge pump 80 in the same manner as described above. Therefore, the washing water in the washing water tank 21 whose temperature has been unnecessarily lowered can always be automatically prevented from being erroneously used for the subsequent dishwashing. Further, prior to the discharge of the cleaning water as described above, through the arithmetic processing in each of the steps 263a to 264a, the sediment adhesion residue on the bottom wall in the cleaning water tank 21 is floated in the same manner as in the previous embodiment. Since the water is removed and remains on the scouring saw 22, the floating residue in the washing hot water tank 21 is discharged together with the above-described washing hot water when it is subsequently discharged, and the residue on the scouring saw 22 is removed. And eliminated by cleaning. Therefore, the sediment adhesion residue hardly remains in the cleaning water tank 21, and the dirt in the cleaning water tank 21 can be removed only by simple cleaning.

Here, the grounds for determining the above-mentioned predetermined time Tα ₀ will be described. When the temperature of the cleaning water in the cleaning water tank 21 after the second rinsing was completed was examined by experiments, the temperature of the cleaning water was reduced by the characteristic curve L shown in FIG.
It was confirmed that it was specified by. According to this, assuming that the second rinsing ends at a point La (corresponding to time zero) on the characteristic curve L, the temperature of the washing water thereafter decreases substantially linearly, and the temperature rises to 50 (° C.). It can be seen that 60 (minutes) elapse when the time reaches). Therefore, if the temperature of the washing water is 50
Considering that it is not suitable for cleaning when the temperature is below the range (° C.) (see the symbol A in FIG. 10), the predetermined time Tα ₀ is, for example, 60
It is understood that (minutes) may be defined.

Next, another embodiment of the present invention will be described. In this embodiment, a power switch 16 as shown in FIG.
0 is additionally employed in the cleaning machine main body B described in the above embodiment, and a driving circuit 170 for driving the electromagnet 166 of the power switch 160 is provided in the above embodiment as shown in FIG. The flowchart of FIG. 4 which is additionally connected to the microcomputer 120 and specifies a part of the computer program described in the above embodiment is partially modified as shown in the flowchart of FIG. In particular, there is a characteristic in its configuration.

The power switch 160 is located on the front panel 1 of the main unit B of the cleaning machine.
This power switch is attached to the bottom of 0a
As shown in FIG. 11, the push button 162 faces the inside of the cylindrical casing 161 fitted to the lower part of the front panel 10a.
In the casing 161 against the coil spring 164 that is locked to the stopper 161a, and the lever 163a of the lever 163 of the push button 162 is pivoted to the bottom wall of the lever in the casing 161. The movable contact 163a of the lever 163 is brought into contact with the fixed contacts 161b, 161b extending into the casing 161 while being engaged with the inner end claw portion 165a of the 165. Further, the power switch 160 attracts the iron piece 165b of the lever 165 by the electromagnet 166 to tilt the lever 165 and the lever 163 when the attracting force is generated by the power supply to the electromagnetic coil 166a of the electromagnet 166 fixed in place. The engagement is released, and the push button 162 is returned to the original position together with the lever 163 and the movable contact 163a by the coil spring 164. However, FIG. 11 shows the self-holding state of the power switch 160 being turned on. Thus, in the power switch 160 configured as described above,
In the self-holding state, both fixed contacts 16
Microcomputer through 1b, 161b and movable contact 163a
120, power supply to the solenoid Sv of the hot water supply valve 30, the discharge motor Md, the cleaning motor Mp, and the electromagnetic coil 165a of the electromagnet 165 is permitted. Other configurations are the same as those in the above embodiment.

In this embodiment configured as described above, if the determination in step 230 (see FIGS. 4 and 13) is "NO", as in the above-described embodiment, the microcomputer 120 transmits the computer program to the power switch control routine 27.
Proceed to 0 (see Fig. 13). Then, in step 271, the microcomputer 120 resets and starts the timer. As a result, the timer starts counting at the same time as the reset. Thus, while repeated determination of "NO" at steps 272 and 273, when the counted time T of the timer reaches a predetermined time T _1, the microcomputer
120 determines "YES" in step 272. However, the predetermined time T ₁ is previously stored in the ROM of the microcomputer 120 as the time required for the determination of the presence or absence of the operations of washing start switch 91.

After that, the microcomputer 120 executes each step 272.
In a to 274a, the same arithmetic processing as the arithmetic processing in each of the steps 263a to 265a is performed. Then each step 27
In steps 2a to 273a, the microcomputer 120 generates a cleaning output signal, resets and starts the timer, and outputs the cleaning output when the timer time T ≧ Td is satisfied, as in the case of each step 263a to 264a. Turn off the signal. Therefore, after the generation of the cleaning output signal, the cleaning pump 40 is driven in the same manner as described above until the cleaning output signal disappears due to the establishment of T ≧ Td, and the cleaning water in the cleaning water tank 21 is pumped to clean from the cleaning nozzle 50. Inject and circulate in the chamber 20. At this time, since the cleaning water in the cleaning water tank 21 flows toward the suction port of the cleaning pump 40, the sediment on the bottom wall in the cleaning water tank 21 is suspended, and the cleaning water is injected into the cleaning chamber 20. Most of the residue in the cleaning water tank 20 accompanies the cleaning water to be used. Therefore, the jet circulating cleaning water in the cleaning chamber 20 returns to the cleaning water tank 21 with the residue remaining on the dice 22 in the same manner as described above.

Thereafter, in each of the steps 273b to 274a, the microcomputer 120 generates the discharge output signal, starts the reset of the timer, and counts the time T ≧ Td of the timer as in the case of each of the steps 264b to 265a. When the condition is satisfied, the emission output signal is extinguished. Therefore, after the discharge output signal is generated, the discharge pump 80 is driven in the same manner as described above to discharge the cleaning water in the cleaning water tank 21 until the discharge output signal disappears due to the establishment of T ≧ Td.

After such ejection, when the microcomputer 120 generates an excitation output signal for exciting the electromagnetic coil 166a in step 274b, the drive circuit 170 excites the electromagnetic coil 166a to drive the electromagnet 166 to reduce the attractive force. generate. Then, the iron piece 165b is attracted by the electromagnet 166, the lever 165 tilts and its engagement is released from the lever 163, and the push button 162
Is pushed out by the coil spring 164 and returns to the original position to disengage the movable contact 163a from the fixed contacts 161b, 161b. This allows the microcomputer 12 to
0, power supply to the electromagnet 166 and other electric elements is cut off.

As can be easily understood from the above description, the washing water in the washing water tank 21 whose temperature has been unnecessarily lowered can always be automatically prevented from being erroneously used for washing dishes. Prior to the discharge of the washing water as described above, through the arithmetic processing in each of the steps 272a to 273a, the sediment attached residue on the bottom wall in the washing water tank 21 is placed in a floating state as described above, and Therefore, the floating residue in the cleaning water tank 21 is discharged together with the cleaning water after the above-described discharge of the cleaning water as described above, and the residue on the scouring saw 22 is removed by removing and cleaning the scouring saw 22. You. Therefore,
In the cleaning water tank 21, the sediment adhesion residue is
After the power supply is interrupted by the switch 160, almost no residue remains, and the dirt in the cleaning hot water tank 21 can be removed only by simple cleaning. Note that the microcomputer 120 stops executing the computer program in step 275.

[Brief description of the drawings]

FIG. 1A and FIG. 1B are correspondence diagrams for the configuration of the invention described in the claims, FIG. 2 and FIG. 3 are overall configuration diagrams showing one embodiment of the present invention, FIG. FIG. 7 is a flowchart showing the operation of the microcomputer shown in FIG.
Fig. 9 is a flowchart showing a main part of a modification of the flowchart of Fig. 6, Fig. 9 is a flowchart showing a modification of the flowchart of Fig. 7, and Fig. 10 is the second time of the temperature of the cleaning water in the cleaning water tank. Illustration of drop situation after rinsing, No.
FIG. 11 is a cross-sectional view of a power switch according to another embodiment of the present invention, FIG. 12 is a block diagram of the main part, and FIG. 13 is a flowchart of the main part. Description of symbols B: Cleaning machine body, Md: Discharge motor, Mp: Cleaning motor, Sv: Solenoid, 20: Cleaning chamber, 21: Cleaning water tank, 22: Slender, 30: Hot water supply valve , 40 ... washing pump, 50 ... washing nozzle, 70a ~ 70c ... tableware, 80 ... discharge pump, 120 ... microcomputer, 130,140.150,1
70 …… Drive circuit, 130a, 140a, 150a …… Relay coil, 13
0b, 140b, 150b: Relay switch, 160: Power switch, 166: Electromagnet.

Claims (2)

(57) [Claims] A washing chamber for accommodating tableware, a washing nozzle provided in the washing chamber for injecting hot water toward the tableware, a washing hot water tank provided at a bottom of the washing chamber for storing hot water; A filter member mounted on an upper surface of the cleaning water tank, a hot water supply valve for controlling hot water supply to the cleaning hot water tank, a cleaning pump for pumping hot water in the cleaning hot water tank and supplying the hot water to the cleaning nozzle, and the cleaning hot water tank A discharge pump for discharging the hot water from the inside to the outside, a cleaning start switch for instructing a start of washing of tableware, and a condition that the cleaning water tank is not filled with hot water in response to operation of the cleaning start switch. After the hot water supply valve is opened until the hot water is filled, a series of controls for operating the washing pump and the discharge pump in this order for a predetermined time each time are repeated a predetermined number of times, and the same number of times is repeated. Lastly, in a dishwasher provided with first control means for omitting only the operation of a discharge pump in a series of controls, a temperature sensor for detecting a temperature of hot water in the cleaning hot water tank; and the first control means. A second control means for operating the washing pump and the discharge pump for a predetermined time each in this order when the temperature of the detected hot water becomes lower than a predetermined temperature after the series of controls is repeated a predetermined number of times. Dishwasher characterized by that. 2. A washing chamber for accommodating tableware, a washing nozzle provided in the washing chamber for injecting hot water toward the tableware, a washing hot water tank provided at the bottom of the washing chamber for storing hot water, and A filter member mounted on an upper surface of the cleaning water tank, a hot water supply valve for controlling hot water supply to the cleaning hot water tank, a cleaning pump for pumping hot water in the cleaning hot water tank and supplying the hot water to the cleaning nozzle, and the cleaning hot water tank A discharge pump for discharging the hot water from the inside to the outside, a cleaning start switch for instructing a start of washing of tableware, and a condition that the cleaning water tank is not filled with hot water in response to operation of the cleaning start switch. After the hot water supply valve is opened until the hot water is filled, a series of controls for operating the washing pump and the discharge pump in this order for a predetermined time each time are repeated a predetermined number of times, and the same number of times is repeated. Lastly, in a dishwasher provided with first control means for omitting only the operation of the discharge pump in the series of controls, the time since the series of controls is repeated a predetermined number of times by the first control means is determined. Tableware comprising timer means for measuring, and second control means for operating the washing pump and the discharge pump for a predetermined time in this order when the time measured by the timer means reaches a predetermined time. washing machine.