JPH0669433B2 - Dishwasher - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a dishwasher.

[Prior Art] Conventionally, in this type of dishwasher, in a washing cycle corresponding to the first cycle, the washing chamber is passed through a washing tank located at the bottom of the washing chamber, and washing water is supplied by a water supply valve. At the end of the procedure, the cleaning water in the cleaning tank is pumped up by the cleaning pump, jetted and circulated from the cleaning nozzle into the cleaning chamber, and the circulating cleaning water is mixed with a detergent to wash the dishes and then the circulating cleaning water is drained. After draining with a pump, in the subsequent several rinsing cycles, the same steps as the above washing cycle are repeated without detergent, and the washing water used in the final rinsing cycle is used as it is for washing in the next rinsing cycle. There are things I tried to do. (See, for example, JP-A-57-175338).

[Problems to be Solved by the Invention]

In general, when washing dishes, it is not necessary to wash the dishes with washing water containing detergent, and in some cases, the dishes may be rinsed only with water containing no detergent. However, in the above-mentioned conventional dishwasher, it is premised that after washing the dishes with wash water containing a detergent, rinsing is performed with water containing no detergent, and rinsing ends when only rinsing is performed. No consideration is given to the subsequent treatment of water. Further, in the case of only rinsing the tableware, if the water used for the previous rinsing of the tableware is used as it is, the tableware will be rinsed with the slightly soiled water, which is not preferable for hygiene.

The present invention has been made to solve the above problems, and when the dishes are only rinsed, the water used for the rinse is effectively used, and the dishes are rinsed hygienically when the rinse is performed. The present invention provides a dishwasher that is properly performed.

[Means for Solving the Problems]

In order to achieve the above object, the structural features of the present invention are
As shown in FIG. 1, a washing chamber 1a for storing dishes, a jet nozzle 1b provided in the washing chamber 1a for jetting water toward the dishes, and a washing nozzle provided at the bottom of the washing chamber 1a for washing water Wash tank 1c to store and water supply valve 1d for controlling water supply to wash tank 1c
In the dishwasher equipped with a washing pump 1e for pumping the water in the washing tank 1c and supplying it to the jet nozzle 1b, and a drainage pump 1f for discharging the water in the washing tank 1c to the outside, washing the dishes and thereafter. A first selection switch 2 for selecting the rinsing and a second selection switch for selecting the rinsing of the dishes only.
When the selection switch 3 and the first selection switch 2 are operated, in response to the operation of the switch 2, the water supply valve 1d is opened until the cleaning tank 1c is not filled with water until the water is filled. After that, the washing pump 1e and the drainage pump 1f are automatically operated only a predetermined number of times in this order for a predetermined time each, and only the operation of the drainage pump 1f of the final series of controls is omitted. In addition, when the second selection switch 3 is operated, in response to the operation of the second selection switch 3, the series of controls is automatically performed a number of times less than the predetermined plurality of times, and the final series of controls is performed. The washing and rinsing control means 4 omitting only the operation of the drainage pump 1f, and the drainage control means 5 for operating the drainage pump 1f for a predetermined time before the series of controls when the second selection switch 3 is operated. Lies in the fact digits.

[Action / effect]

In the present invention configured as described above, when the first selection switch 2 is operated after the detergent is put in the cleaning chamber 1a together with the dishes, the cleaning rinse control for the water supply valve 1d, the cleaning pump 1e, and the drainage pump 1f is performed. By the series of control of the means 4, the dishes are rinsed with detergent-containing water and then rinsed with detergent-free water, and the water used for the final rinse is stored in the cleaning tank 1c for the next cleaning. Stored in. Washing room
When the second selection switch is operated after the tableware is put in 1a, first, the water used for the previous rinsing stored in the washing tank 1c is controlled by the drainage control means 5 to the drainage pump 1f. Is discharged. Next, the cleaning rinsing control means 4 for the water supply valve 1d, the cleaning pump 1e, and the drainage pump 1f
With the above series of control, the dishes are only rinsed with detergent-free water, and the water used for the last rinse is stored for the next cleaning.

As a result, according to the present invention, even when the second selection switch 3 is operated to select only rinsing of dishes, water is effectively used for the next dish washing. In addition, even after washing and rinsing the dishes or just rinsing the dishes, if only rinsing the dishes is selected next time,
Since the water used for the previous rinsing and stored in the washing tank 1c is discharged and the dishes are rinsed with the newly supplied water, the rinsing of the dishes is always hygienic and good.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
Drawing and Drawing 3 show the whole dishwasher composition concerning the present invention. The body of this dishwasher (hereinafter, the washing machine body B
2), as shown in FIG. 2, is a cleaning chamber 20 integrally formed inside the housing 10 above the inner wall of the housing 10.
A water supply valve 30 is attached to the upper part of the peripheral wall of the cleaning chamber 20. The water supply valve 30 is opened by selective excitation of its solenoid Sv (see FIG. 3), and wash water of 80 (° C.) or more from a hot water supply source (not shown) is passed through the wash chamber 20 and this wash chamber 20 It is supplied into the cleaning tank 21 extending downward from the left side portion of the bottom wall of the. In FIG. 2, reference numeral 22 indicates a sludge, and reference numeral 23 indicates a heat insulating heat insulating material.

A cleaning pump 40 is attached to the central part of the peripheral wall of the cleaning tank 21 via a heat insulating material 23, and the cleaning pump 40 is driven by a cleaning electric motor Mp coaxially assembled to the cleaning pump 40, The washing water in the washing tank 21 is pumped up and the washing room
The washing water is sprayed and circulated in the washing chamber 20 from the washing nozzle 50 axially supported at the center of the bottom wall of the table 20 to wash the dishes 70a, 70b, 70c placed on the washing rack 60. The drainage pump 80 is driven by a drainage electric motor Md coaxially assembled to the drainage pump, and pumps out the wash water in the wash tank 21 through a pipe line 21a extending from the bottom of the peripheral wall of the wash tank 21. Discharge from the passage 81 and the drainage pipe 24. The heater H extends from the bottom of the peripheral wall into the cleaning tank 21, and the heater H is arranged in the cleaning tank 21 according to the heat generation energy of the built-in heating coil Ch (see FIG. 3). Heat the wash water. The discharge pipe 24 also plays a role of discharging overflow water of the cleaning water in the cleaning chamber 20.

Next, the electric circuit configuration of this embodiment will be described with reference to FIG. 3. The cleaning operation circuit 90a has a normally open push button type cleaning start switch 91.
Is grounded at one end and connected to the positive terminal of a DC power supply (not shown) through a resistor 92 at the other end.
Then, when the cleaning start switch 91 is closed, the cleaning operation circuit 90a generates a cleaning start signal at a low level from the common terminal of the cleaning start switch 91 and the resistor 92 (hereinafter referred to as the output terminal 93). The cleaning start signal disappears when the cleaning start switch 91 is opened. The single rinsing operation circuit 90b has a normally open type push button type rinsing start switch 94, which is grounded at one end and is connected to the positive side of the DC power source through the resistor 95 at the other end. It is connected to the side terminal. Therefore, when the rinse start switch 94 is closed, the independent rinse operation circuit 90b operates so that the common terminal (hereinafter referred to as the output terminal) of the rinse start switch 94 and the resistor 95.
96) and a single rinse start signal is generated at a low level. Further, the single rinse start signal disappears when the rinse start switch 94 is opened.

The water amount detection circuit 100 has a normally open type float switch 101, and the float switch 101 is operably interposed in the drainboard 22 (see FIG. 2). Further, as shown in FIG. 3, the float switch 101 is grounded at one end thereof, and the other end of the float switch 101 is connected through a resistor 102 to the positive terminal of the DC power supply. Then, when the wash water in the wash tank 21 reaches a predetermined level La or more corresponding to the full state, the float switch 101 is closed by the operation of the float. Further, when the wash water in the wash tank 21 decreases below a predetermined level La, the float 101 is opened by returning the float to the non-operating state. Therefore, the water amount detection circuit 100 generates a water amount 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 by opening the float switch 101. Further, this water amount detection signal disappears when the float switch 101 is opened.

The temperature detection circuit 110 has a temperature sensor 111, and this temperature sensor 111 is, as shown in FIG.
Is directly fixed to the peripheral wall of the. Further, the temperature sensor 11 is
As shown in FIG. 3, one end of the temperature sensor 111 is grounded, and the other end of the temperature sensor 111 is connected to the positive terminal of the DC power source via a resistor 112. Then, the temperature detection circuit 11
0 indicates that the DC voltage (+ Vc) from the DC power source is divided by the temperature sensor 111 and the resistor 112 according to the temperature detected by the temperature sensor 111 in the cleaning tank 21, and the result of the voltage division is used for cleaning the cleaning tank 21. A temperature detection signal of a level corresponding to the actual temperature of water is generated from a common terminal of the temperature sensor 111 and the resistor 112 (hereinafter referred to as the output terminal 113).

The microcomputer 120 executes a computer program in cooperation with the cleaning operation circuit 90a, the single rinse operation circuit 90b, the water amount detection circuit 100, and the temperature detection circuit 110 in accordance with the flowcharts shown in FIGS. During execution, arithmetic processing necessary for drive control of each drive circuit 130, 140, 150, 160 connected to each relay coil 130a, 140a, 150a, 160a is performed. However, the above computer program is stored in advance in the ROM of the microcomputer 120. Each drive circuit 130, 140, 150, 160, under the control of the microcomputer 120, each relay coil 130a,
140a, 150a and 160a are selectively excited.

The normally open type relay switch 130b constitutes a relay together with the relay coil 130a, and this relay switch 130b is closed only under the excitation of the relay coil 130a to apply the power supply voltage from the commercial power source Ps to the solenoid Sv. To excite. The normally-open relay switch 140b constitutes a relay together with the relay coil 140a, and this relay switch 140b is closed only under the excitation of the relay coil 140a to apply the power supply voltage from the commercial power source Ps to the washing electric motor Mp. Drive this. The normally open relay switch 150b constitutes a relay together with the relay coil 150a.
Is closed only when the relay coil 150a is excited, and commercial power Ps
The drainage electric motor Md is supplied with the power supply voltage from to drive it. The normally open relay switch 160b is a relay coil.
It is closed only under the excitation of 160a, and the power supply voltage from the commercial power source Ps is applied to the heating coil Ch to cause the heating coil Ch to generate heat. The relay switch 160b constitutes a relay together with the relay coil 160a.

In the present embodiment configured as described above, if the microcomputer 120 is operated and a cleaning start signal is generated from the operation circuit 90a, the microcomputer 120
According to the flowchart of FIG. 4, the computer program starts to be executed in step 200, is initialized in step 210, the cleaning start signal is read from the cleaning operation circuit 90a in step 220, and based on the read contents, in step 230a. After the determination of "NO", it is determined to be "YES" in step 230b, the heating output signal for heating the heating coil Ch is extinguished in step 230c, and the computer program is advanced to the cleaning control routine 240 (No. (See Figures 4 and 5).

Then, the microcomputer 120 starts the execution of the cleaning control routine 240 at step 240a, and then the step 2
At 41, a solenoid excitation output signal required to excite the solenoid Sv of the water supply valve 30 is generated, and in response thereto, the drive circuit 13
0 excites the relay coil 130a, the relay switch 130b is closed, and the water supply valve 30 is opened by the excitation of the solenoid Sv to supply the cleaning water from the hot water supply source into the cleaning tank 21. Then, when the water amount detection circuit 100 generates a water amount detection signal during the repetition of the determination of “NO” in step 243, the microcomputer 120 reads the same water amount detection signal in step 242, and based on the read result. Step two
It is determined to be "YES" at 43, and the solenoid excitation output signal is extinguished at step 243a. Therefore, the drive circuit 13
Based on the disappearance of 0, the relay coil 130a is demagnetized, the relay switch 130b is opened, the water supply valve 30 is closed by the demagnetization of the solenoid Sv, and the water supply from the hot water supply source to the cleaning chamber 20 is stopped. As a result, the cleaning water is maintained in the cleaning tank 21 in a full state. The predetermined level La in step 243 is stored in advance in the ROM of the microcomputer 120.

After the calculation in step 243a, the microcomputer 12
In step 243b, 0 generates a cleaning output signal necessary for driving the cleaning motor Mp and resets and starts a timer (built in the microcomputer 120). 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 to clean the cleaning tank 21. Water is pumped up and jetted and circulated from the washing nozzle 50 into the washing chamber 20. As a result, the dishes 70a-70b are washed with washing water mixed with detergent. Further, the timer starts counting time when it is reset and started.

Then, when the measured value T of the timer reaches a predetermined cleaning time Tp (previously stored in the ROM of the microcomputer 120), the microcomputer is judged based on the judgment that the cleaning is completed.
120 determines “YES” in step 244, and proceeds to step 244
At a, the cleaning output signal is extinguished, and in response to this, the drive circuit 140 demagnetizes the relay coil 140a, and the cleaning pump 40
However, the pumping of the washing water is stopped by stopping the washing motor Mp accompanying the opening of the relay switch 140b.

After that, the microcomputer 120 generates the drainage output signal necessary for driving the drainage motor Md and resets and starts the timer in step 244b. Then, the drive circuit 150 excites the relay coil 150a in response to the drainage output signal from the microcomputer 120, the relay switch 150b is closed, and the drainage pump 80 is driven by the drainage electric motor Md to wash the inside of the washing tank 21. Pumping out water and pipeline
81 and the discharge pipe 24. Also, the timer starts to count by the reset start. Then, the measured value T of this timer is the predetermined drainage time Td (microcomputer
120), the microcomputer 120 judges that the drainage is completed, and the microcomputer 120 proceeds to step 245.
Is determined as YES in step 245a, the drain output signal is extinguished in step 245a, the drive circuit 150 demagnetizes the relay timer 150a, and the drain pump 80 is washed by stopping the drain motor Md accompanying the opening of the relay switch 150b. Stop draining water.

Upon completion of the cleaning control routine 240, the microcomputer 120 advances the computer program to the rinse control routine 250 (see FIG. 4). Then, the microcomputer 120 starts the execution of the rinsing control routine 250 at step 250a according to the flowchart of FIG. 6, and at each step 251-254a, performs the arithmetic processing in each step 241-244a (see FIG. 5). Similar calculation processing is performed. This allows the water valve
After the washing water is supplied to the washing tank 21 via 30 until the washing water is full, the washing tank is washed by the washing pump 40.
The washing water drawn from 21 is jetted and circulated from the washing nozzle 50 into the washing chamber 20 to rinse the dishes 70a to 70c without detergent.

When the rinsing control routine 250 proceeds to step 254b, the microcomputer 120 updates zero and the initialized number data N in step 210 to "1" in step 254b, and sets N = 1 in step 255. Based on "NO",
After that, in each step 255a to 256a, each step 24
The same arithmetic processing as that in 4b to 245a is performed. As a result, the cleaning water in the cleaning tank 21 is discharged by the drainage pump 80 in the same manner as described above.

When the first rinse drainage is completed in this way, the microcomputer 120 restarts the steps 251-254b.
And the second rinsing of the dishes 70a to 70c is performed in the same manner as described above. Next, when the rinse control routine 250 proceeds to step 254b, the microcomputer 120 updates N = 2 in step 254b, and in step 255, determines "YES" based on N = 2. In other words, the microcomputer 120 prohibits the rinsing control routine 250 from shifting from step 255 to step 255a on the premise that N = 2 is satisfied, and then proceeds to step 220 (fourth step).
(See figure). Therefore, the cleaning water used for the second rinsing of the dishes 70a to 70c remains stored in the cleaning tank 21 except for the portion flowing out from the discharge pipe 24 during the rinsing. . Further, the temperature of the washing water in the washing tank 21 gradually decreases during the rinsing of the dishes 70a to 70c, and after the rinsing ends, drops to around 60 ° C.

At this stage, if the cleaning start signal from the cleaning operation circuit 90 is still generated, the microcomputer 120
However, similarly to the above, after the determination of “YES” in step 230b, the routine proceeds to the execution of the cleaning control routine 240. Further, at this time, instead of the above-mentioned tableware 70a to 70c, another tableware having stains that are hard to remove at high temperature is placed on the washing rack 60. Then, the microcomputer 120
However, the calculation processing in each of the steps 241-243a similar to the above is performed according to the flowchart of FIG.
Replenish the shortage of washing water inside. As a result, the cleaning water at around 60 ° C. is maintained in the cleaning tank 21 in a full state.

After that, the microcomputer 120 executes the steps 243b-2.
The calculation processing in 44a is performed in the same manner as described above, and the cleaning pump 40 jets and circulates the cleaning water in the cleaning tank 21 from the cleaning nozzle 50 into the cleaning chamber 20. For this reason, the other dishes are washed with detergent water around 60 ° C. while being mixed with detergent. As a result, stains attached to the other dishes that are hard to remove at high temperatures can be easily and surely removed. After cleaning in this way, the microcomputer 120
However, the arithmetic processing in each of the steps 244b to 245a and the arithmetic processing in the rinse control routine 250 are performed to achieve the same drainage, rinsing, and the like as described above.

As can be understood from the above explanation, paying attention to the fact that the temperature of the wash water used for the second rinse drops to around 60 ° C at the end of the rinse, and store the wash water in the wash tank 21 without draining it. Since it is used for cleaning the next dish with detergent, it not only helps to save water, but also ensures that when washing dishes, wash water at a temperature (around 60 ° C) suitable for washing with detergent is secured. Moreover, at the time of rinsing tableware, it is possible to secure cleaning water at a temperature suitable for rinsing (about 80 ° C.), and surely realize rinsing with removal and sterilization of stains that are difficult to remove at high temperatures of tableware.

If the determination in step 230b is "NO" after the determination in step 255 is "YES", the microcomputer 120 proceeds to execute the heat retention determination routine 260 (see FIG. 4). Then, the microcomputer
120 starts execution of the heat retention determination routine 260 at step 260a according to the flowchart of FIG.
At 61, the water amount detection signal from the water amount detection circuit 100 is read.
If the water amount detection signal is not generated from the water amount detection circuit 100 at this stage, the microcomputer 120 determines “NO” in step 262.

On the other hand, when the determination in step 262 is “YES”, the microcomputer 120 determines in step 262a that
The value of the temperature digital signal from the temperature detection circuit 110 is digitally converted into a digital temperature D, and this digital temperature D is compared with the reference temperature Do in step 263 for determination.
However, the reference temperature Do is stored in advance in the ROM of the microcomputer 120 as a value around 60 ° C. Then D
If ≧ Do is satisfied, the temperature of the cleaning water in the cleaning tank 21 is 60
Based on the determination that the value around 0 ° C. is maintained, the microcomputer 120 determines “YES” in step 263. On the other hand, if D <Do is satisfied, the microcomputer 120 determines that the temperature of the cleaning water in the cleaning tank 21 has dropped to a value not suitable for cleaning, and the microcomputer 120 executes step 263. Discriminates "NO".

After the determination of “NO” in step 262 as described above,
Alternatively, after determining “YES” in step 263, the microcomputer 120 sets the heating output signal to the extinguished state in step 263a, and the computer program executes step 220.
Proceed to. In this case, step 262 to step 263a
The shift to (6) corresponds to the lack of the amount of wash water in the wash tank 21, while the shift to step 263a from step 263 corresponds to the proper temperature of the wash water in the wash tank 21. When the determination in step 263 is “NO” as described above, the microcomputer 120
Generates a heating output signal in step 263b, and in response thereto, drive circuit 160 excites relay coil 160a, relay switch 160b is closed, and the power supply voltage from commercial power supply Ps is applied to heating coil Ch. For this reason, the heater H
The cleaning water in the cleaning tank 21 is heated according to the heat generation of Ch.

As described above, even if the temperature of the cleaning water remaining in the cleaning tank 21 after the second rinse is finished unnecessarily decreases, the residual cleaning water is automatically and immediately heated by the heater H. Since the temperature is maintained at the proper cleaning temperature, the temperature of the residual cleaning water in the cleaning tank 1b can be automatically maintained at the proper cleaning temperature and used for the next dish cleaning without any extra operation. Therefore, a cleaning tank whose temperature has dropped unnecessarily
There is no possibility that the residual cleaning water in 21 will be mistakenly used for subsequent food cleaning.

By the way, in the above description, the case where each dish 70a to 70c is rinsed after being washed has been described.
When there is little dirt on 70 c and only rinsing is required, the rinsing start signal is generated from the single rinsing operation circuit 90 b instead of the cleaning start signal from the cleaning operation circuit 90 a. Then, the microcomputer 120 inputs the rinsing start signal in step 220, determines “YES” based on the rinsing start signal in step 230a, and extinguishes the heating output signal in step 230d. Program Rinse Control Routine 270 (See Figures 4 and 8)
Proceed to.

Then, the microcomputer 120 executes the single rinse control routine 270 in step 270a (see FIG. 8).
At step 271, 272 and 272a, the same arithmetic processing as that at each of steps 244b to 245a (see FIG. 5) is performed. As a result, the cleaning water in the cleaning tank 21 is discharged by the drainage pump 80 in the same manner as described above. Then, the microcomputer 120 executes each step 273, 27.
At 4,275 and 275a, the same arithmetic processing as that in steps 241-243a (see FIG. 5) is performed. As a result, the cleaning water from the hot water source is supplied to the cleaning chamber by the water supply valve 30.
It is supplied to the washing tank 21 through 20 until it becomes full.

After that, the microcomputer 120 executes each step 276,2.
At 77 and 277a, the same arithmetic processing as the arithmetic processing in each step 243b to 244a (see FIG. 5) is performed. This allows
The washing water in the washing tank 21 is the same as the above-mentioned washing pump.
It is pumped out by 40 and is sprayed and circulated in the washing chamber 20 through the washing nozzle 50 to rinse each dish in the washing chamber 20. In such a case, in executing the single rinse control routine 270,
After always draining the wash water in the wash tank 21 in advance, new wash water is supplied to the wash tank 21 from the hot water source and each dish is rinsed with the wash water, so that each dish is always freshly washed. You will always be able to rinse with water. Therefore, it is possible to surely rinse and sterilize each dish.

After the calculation processing in step 277a, the microcomputer 120 executes the computer program in step 220.
(See FIG. 4). Therefore, the washing water used for rinsing each dish alone is not drained, and is substantially the same as that after the determination of “YES” in step 255 (see FIG. 6). It remains stored inside.

In this case, the temperature of the washing water in the washing tank 21 gradually decreases during the rinsing of each dish, and after the single rinsing is completed,
Fall back and forth. For this reason, if such washing water is used for the next detergent mixed with the detergent of the tableware as described above, it is of course useful for saving water, and is suitable for rinsing when the dish is rinsed alone. Secure fresh wash water at a temperature (around 80 ° C), and at the time of washing the dishes after that, secure a wash water at a temperature (around 60 ° C) suitable for washing with detergent to rinse the dishes individually and then It is possible to surely remove the dirt that is hard to remove from the tableware. If the determination in step 230b is "NO" after the execution of the single rinse control routine 270, the heat retention determination routine 260 is executed in the same manner as described above, and the cleaning water in the cleaning tank 21 by the heater H is executed. Is maintained to maintain the proper cleaning temperature.

In implementing the present invention, step 263a may be omitted, and in the calculation of step 263b, instead of generating the heating output signal, the calculation in steps 244b to 245a may be performed to discharge the wash water. For example, it is possible to prevent the inconvenience of performing the subsequent cleaning with the cleaning water having an unnecessarily lowered temperature.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to the configuration of the invention described in the claims, FIGS. 2 and 3 are overall configuration diagrams showing an embodiment of the present invention, and FIGS. 4 to 8 are FIG. 3 is a flowchart showing the operation of the microcomputer of FIG. Explanation of code B …… washer body, Ch …… heating coil, H …… heater,
Md …… Drainage motor, Mp …… Washing motor, Sv …… Solenoid, 20 …… Washing room, 21 …… Washing tank, 30 …… Water supply valve,
40 ... Washing pump, 50 ... Injection nozzle, 70a to 70c ... Tableware, 80 ... Drainage pump, 120 ... Microcomputer, 130, 140, 150, 160 ... Driving circuit, 130a, 140a, 150a,
160a …… Relay coil, 130b, 140b, 150b, 160b …… Relay switch.

Claims (1)

[Claims] 1. A washing chamber for accommodating dishes, an injection nozzle provided in the washing chamber for injecting water toward the dishes, a washing tank provided at the bottom of the washing chamber for storing water, and the washing. A dishwasher provided with a water supply valve for controlling water supply to the tank, a cleaning pump for pumping water in the cleaning tank and supplying the water to the injection nozzle, and a drainage pump for discharging water in the cleaning tank to the outside. In, the first selection switch for selecting the washing and subsequent rinsing of the dishes, the second selection switch for selecting only the rinsing of the dishes, and the operation of the switch when the first selection switch is operated. In response, after opening the water supply valve until the water is filled in the washing tank on condition that the water is not filled, the washing pump and the drainage pump are sequentially turned off in this order for a predetermined time. The series of controls to be operated is automatically performed only a predetermined number of times, and only the operation of the drainage pump in the series of controls of the final cycle is omitted, and when the second selection switch is operated, the switch is operated. In response to the cleaning and rinsing control means for automatically performing the series of control a number of times less than the predetermined plurality of times and omitting only the operation of the drainage pump in the series of the control of the final cycle. And a drainage control means for operating the drainage pump for a predetermined time when the selection switch is operated, the dishwasher.