JP2645960B2 - 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 dryer.

[0002]

2. Description of the Related Art Conventionally, a dishwasher of this type is disclosed in Japanese Patent Application Laid-Open No. Hei 3-222929. In this method, at the start of the washing operation, water is supplied to the cavity until the specified water level is detected by the water level detection device, and when the water reaches the specified water level, the water supply operation is terminated and the washing operation is started.

[0003]

Generally, in a dishwasher, when washing operation is completed, washing water remains in the cavity as residual water. This is because even if the drainage pump is driven to drain the cleaning water in the cavity, if the drainage pump is drained to some extent depending on the installation state, the air is clogged and the drainage cannot be performed.

[0004] Therefore, if the cleaning operation is not performed, for example, for one week, the residual water in the cavity remains for one week, and there is a risk that various bacteria in the residual water will proliferate, generate odor, and become rotten. is there.

At this time, when the washing operation is started as in the conventional example, the dishes are washed with washing water in which the remaining water in the cavity and newly supplied water are mixed.
It was very unsanitary.

When the tableware is placed in the tableware basket and the tableware basket is stored in the cavity, for example, the remaining miso soup is left in the bowl and the remainder is discarded in the cavity. It can be stored.

At this time, when the washing operation is started as in the conventional example, the remaining miso soup discarded in the cavity is mixed with the washing water for washing, and the washing water becomes dirty. Had a reduced cleaning ability.

[0008] The present invention is to solve such a problem.

[0009]

According to the present invention, there is provided a cavity for accommodating tableware, a water supply device for supplying cleaning water to the cavity, and a cleaning water in the cavity having a specified water level. , A water level detection device that outputs a detection signal when it reaches, a cleaning pump that injects the cleaning water in the cavity to the tableware, a drainage device that drains the cleaning water in the cavity, the drainage device, the cleaning pump, Controlling the water supply device to supply and drain water for a certain period of time
A control unit for supplying water for the washing step after the treatment operation and performing the washing step , wherein the control unit performs the residual water treatment operation
During the water supply of the specified water level was detected by the water level detection device
Stop supplying water and remove all of the cleaning water in the cavity.
After draining, the residual water treatment operation is performed again .

[0010]

[ Operation ] In other words, the residual water treatment operation performed before the washing process
It is first slightly watered wash water to the water supply device for a predetermined period of time driving to the cavity. Drainage device is driven after floating the residual water in the cavity by this water supply and the dirt such as the residual vegetables dropped from the tableware when the tableware is stored in the cavity,
Drain residual water in the cavity and dirt in the cavity together with the cleaning water . During the residual water treatment operation, the water level detection
When the specified water level is detected, the water supply is stopped and the
After draining all the washing water in the
Is executed again .

[0011]

1 to 4, reference numeral 1 denotes a cavity for accommodating tableware, and the cavity 1 is formed in a box shape having an opening for accommodating tableware on a front surface thereof. Reference numeral 2 denotes a door which is openably and closably mounted to close an opening on the front surface of the cavity 1, reference numeral 3 denotes a nozzle which is rotatably mounted at the center of the bottom surface of the cavity 1, and reference numeral 4 denotes a heater which is disposed on the bottom surface of the cavity 1 and heats washing water. Reference numeral 5 denotes a concave portion provided at the bottom of the front surface of the cavity 1, reference numeral 6 denotes a discharge port for discharging cleaning water accumulated in the concave portion 5, and reference numeral 7 denotes a cleaning and drainage pump (hereinafter referred to as a pump) which also serves as a drainage device mounted on the outer bottom surface of the cavity 1. That)
It is.

The pump 7 includes a pump casing 11 having a suction port 8, a discharge port 9 and an impeller 10, and a rubber pipe 12 connecting the suction port 8 and the discharge port 6 of the concave portion 5.
Connected with. When the pump 7 rotates forward, water is supplied to the nozzle 3 from the discharge port 9 of the pump casing 11 to inject washing water into the dishes in the cavity 1. When the pump 7 is rotated backward, the washing water is drained through the drain pipe 21. Is what is done. Although the pump 7 serves both as a washing pump and a drainage pump, a pump provided with a washing pump and a drainage pump separately may be used.

Reference numeral 13 denotes a filter on the concave portion 5 for removing residual vegetables in the washing water, 14 denotes an outer tank covering the cavity 1, 15 denotes a rear plate attached to the outer tank 14 at a predetermined distance from the rear surface of the cavity 1, 16 Is a two-sided fan that is driven to rotate by a motor 24, 17 is between the cavity 1 and the rear face plate 15,
A circulation air path divided by the double-sided fan 16 and a cooling air path 18 similarly divided by the double-sided fan 16. The circulation air passage 17 communicates with an exhaust port 19 provided on the upper rear surface of the cavity 1 and an intake port 20 on the lower rear surface, and the air in the cavity 1 is forcibly forced by the double-sided fan 16 from the exhaust port 19. The air is exhausted into the circulation air passage 17 and the air that has been dehumidified by heat exchange with the double-sided fan 16 is again supplied from the intake port 20 to the cavity 1.
Inspiring inside.

Reference numeral 22 is provided on the rear side of the cavity 1,
A water supply valve 23 serving as a water supply device for supplying cleaning water into the cavity 1 is connected to the water supply valve 22, a water supply port provided in the circulation air passage 17, and a microcontroller 25 controls a cleaning, rinsing, and drying sequence. This is a control box in which a computer and the like are stored.

Reference numeral 33 denotes a pipe 12 and a pump casing 11
Is provided at the connecting portion 26, and is a transmittance detection device for irradiating the cleaning water with light and detecting the transparency (hereinafter referred to as transmittance) of the cleaning water based on the amount of light passing therethrough. The transmission detecting device 33 is connected to the connecting portion 26 on the left side toward the suction port 8 of the pump casing 11.
A light-emitting / transmitting portion 27 formed of a light-transmitting member on the wall of the light-emitting device;
A light-emitting element mounting portion 29 screwed to the pump casing 11 to fix the light-transmitting portion 27 to a light-transmitting portion 30 provided on the right wall surface of the connecting portion 26 facing the light-emitting and transmitting portion 27. A light receiving element 31 such as a phototransistor that receives light from the light emitting element 28 via the light receiving / transmitting section 30 and a screw is fixed to the pump casing 11 to fix the light receiving element 31 to the light receiving / transmitting section 30. And a light receiving element mounting portion 32.

The pump 7 is mounted so that the position of the suction port 8 of the pump casing 11 is higher than the position of the discharge port 6 of the recess 5 by about 15 mm. This is because water is drained from the cavity 1 by the pump 7 and when the water level of B in FIG. 2 is reached,
The pump 7 causes air to enter the pump casing 11 through a gap between the discharge port 6 of the concave portion 5 and the water surface of the water level B, causing air trapping, so that washing water below the water level of B cannot be drained, and light emission is transmitted to the remaining water. If the part 27 and the light-receiving / transmitting part 30 are immersed for a long time, water scale adheres and acts to reduce the amount of transmitted light. This is because the device 33 had to be installed high.

Numeral 40 denotes a detergent dispensing device provided with a detergent storage section provided on the inner surface of the door 2, and when storing tableware in the cavity 1, detergent is stored in the detergent storage section. The lid is opened and the detergent is injected into the cavity 1.

In FIG. 4, reference numeral 35 denotes a water level detection box for detecting whether the water level in the cavity 1 has reached a specified level.
Scan (unillustrated) water level detection equipment that is provided inside the water supply solenoid for opening and closing the water supply valve 22 is 36, 37 key device of the start key or the like arranged on an operation panel provided on the door 2 (not shown), 38 Is a microcomputer (hereinafter referred to as a microcomputer) serving as a control unit housed in the control box 25, and the microcomputer 38 has a timer 39 for measuring time.

[0019] The water level detection boxes is communicated with the cavity 1, and the water level sensing apparatus 35 includes a float, a limit switch for outputting a detection signal in association with increase of the float when detecting normal level , Is composed of. Then, the water level also rises in the water level detection box with an increase of the water level of the washing water of the cavity 1, the float rises along with the rise of the water level, wash water defined water level is a water supply in the cavity 1 In this case, the limit switch is operated in conjunction with the rise of the float, and a detection signal is output.

The operation of the microcomputer 38 for supplying water at the start of the cleaning operation in such a configuration will be described with reference to FIG.

When the start key of the key device 37 is operated, first, at step S1, the water level detecting device 35 detects whether or not the specified water level has already been supplied into the cavity 1.

Normally, since water is not supplied, step S
5 to energize the water supply solenoid 36 to supply water to the water supply valve 22.
It is carried out an open water supply for 15 seconds. If it is determined in step S7 that the time measured by the timer 39 has elapsed 15 seconds, the process proceeds to step S7.
At 8, the power supply to the water supply solenoid 36 is stopped, and the water supply valve 22 is closed to stop water supply.

If it is determined in step S1 that the flush water of the specified water level has already been supplied to the cavity 1, the pump 7 is reset in step S2 until the reset water level of the water level detecting device 35, that is, the water level in the cavity 1 becomes zero. Is reversed to continue draining. If it is determined in step S3 that the water level has become zero, the pump 7 is stopped in step S4 to stop draining, and then the above-described operation is performed. Also, 15
The feedwater between seconds and detects whether detects the specified water level in the water level detection unit 35 in step S6, the aforementioned stop the water supply by closing the water supply valve 22 at step S9 if detecting a normal level if The operation is restarted from the operation of step S2.

When the water supply is stopped in step S8, the pump 7 is subsequently reversed in step S9 to start draining.
In step S10, the process is continued until the water level detection device 35 reaches the reset water level. If the reset water level is reached, step S1
In step 2, the water supply valve 22 is opened to start supplying cleaning water used in the cleaning process. If the specified water level is detected by the water level detecting device 35 in step S13, the water supply valve 22 is closed to stop water supply in step S14, and the process proceeds to the next washing step. In the washing step, the detergent is first supplied from the detergent input device 40 to the cavity 1.
After that, the pump 7 is rotated forward to start the washing operation. That is, steps S1 to S12 are:
This is a step of performing a residual water treatment operation.

If the above operation is repeated each time the washing operation is started, the washing process can be started from a state where the washing water is always clean, and in particular, the dishwashing and drying provided with the transmittance detecting device described in the above embodiment. In the machine, the reference value of the transmittance is usually detected before the washing step, so that the reference value is not determined with the turbid washing water, and the washing time is not prolonged accordingly.

[0026]

According to the present invention, when the residual water treatment operation is performed,
In both cases, the water level in the cavity is
When the water level becomes higher than the specified level, stop water supply and drain once.
Since so as to water, can start the washing process in the always clean washing water, without having to reduce the cleaning ability, also it is something that would be off-flavor caused by bacteria breeding in the wash water.

[Brief description of the drawings]

FIG. 1 is a sectional view of a dishwasher according to the present invention.

FIG. 2 is an enlarged view of the bottom of the cavity.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a control block diagram of the dishwasher of the present invention.

FIG. 5 is an operation flowchart of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cavity 7 Cleaning and drainage pump 22 Water supply valve 35 Water level detection device 38 Microcomputer

Claims (1)

(57) [Claims] 1. A cavity for accommodating tableware, a water supply device for supplying cleaning water to the cavity, a water level detection device for outputting a detection signal when the cleaning water in the cavity reaches a prescribed water level, A washing pump for injecting washing water into the tableware, a drainage device for draining washing water in the cavity, and a residual water treatment for supplying and draining water for a certain time by controlling the drainage device, the washing pump and the water supply device.
A control unit for supplying water for the washing step after the operation and performing the washing step , wherein the control unit supplies water for the residual water treatment operation;
Underwater, when the specified water level is detected by the water level detection device,
Stop supplying water and drain all washing water in the cavity
The dishwasher is characterized by re-executing the residual water treatment operation after the washing.