JPH05329089A - Dish washer and dryer - Google Patents

Abstract

PURPOSE:To provide a dish washer and dryer which can work with a clean washing water always when a washing cycle is started. CONSTITUTION:Before water is supplied to the specified level and the dish wash process is executed, a certain period of water supply takes place so that the remaining water and contamination in the cavity are put afloat, and thereafter they are exhausted together. Thereby a dish washer and dryer can always wash dishes with a clean washing water when a washing cycle is started.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a dishwasher.

[0002]

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

[0003]

Generally, in a dishwasher, when the washing operation is finished, the 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 it is drained to some extent depending on the installation state of the drainage pump, air will be caught and the drainage will not be possible.

Therefore, if the cleaning operation is not performed for, for example, one week, the residual water in the cavity is left for one week, and various bacteria in the residual water may propagate and generate an odor, resulting in a rotten state. is there.

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

When the tableware is placed on the tableware basket and the tableware basket is stored in the cavity, for example, there is a residue of miso soup in the bowl and the remainder is thrown into the cavity and then the tableware basket is placed in the cavity. Can be stored.

At this time, when the washing operation is started as in the conventional example, the rest of the miso soup thrown into the cavity is mixed with the washing water for washing, and the washing water is contaminated. Had a poor cleaning ability.

The present invention solves such a problem.

[0009]

Means for Solving the Problems The means of the present invention for solving the above-mentioned problems include a cavity for storing dishes, a water supply device for supplying cleaning water to the cavity, and the cleaning water in the cavity having a prescribed water level. Water level detection device that outputs a detection signal when reaching, a cleaning pump that sprays the cleaning water in the cavity onto the dishes, a drainage device that drains the cleaning water in the cavity, the drainage device, the cleaning pump, and A control unit that controls the water supply device to perform a cleaning operation is provided. The control unit drives the water supply device for a certain period of time at the start of the cleaning operation, and then drives the drainage unit to wash the cleaning water in the cavity. After the water is drained, the water supply device is driven until the detection signal is output from the water level detection device.

[0010]

That is, when the cleaning operation is started, the water supply device is first driven for a certain period of time to supply a small amount of cleaning water into the cavity. By this water supply, the residual water in the cavity and the dirt such as the residual food dropped from the tableware when the dishes are stored in the cavity are floated, and then the drainage device is driven to wash the residual water in the cavity and the dirt in the cavity. The water is drained together with the water, and then the water supply device is driven again to supply the wash water until the detection signal is output from the water level detection device.

[0011]

1 to 4, reference numeral 1 denotes a cavity for storing dishes, and the cavity 1 is formed in a box shape having an opening for storing dishes on the front surface. Reference numeral 2 is a door that is openably and closably attached to close the front opening of the cavity 1, 3 is a nozzle that is rotatably attached to the center of the bottom surface of the cavity 1, and 4 is a heater that is disposed on the bottom surface of the cavity 1 and heats cleaning water. Reference numeral 5 denotes a concave portion provided on the bottom of the front surface of the cavity 1, 6 denotes an outlet for discharging the cleaning water accumulated in the concave portion 7, and 7 denotes a cleaning / drainage pump (hereinafter referred to as a pump) that also functions as a drainage device mounted on the outer bottom surface of the cavity 1. Say)
Is.

The pump 7 comprises 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 recess 5.
Are connected with. Further, when the pump 7 rotates in the normal direction, water is sent from the discharge port 9 of the pump casing 11 to the nozzle 3 to inject the washing water to the dishes in the cavity 1, and when it is reversed, the washing water is drained through the drain pipe 21. Is done. The pump 7 is used as both a washing pump and a drainage pump, but it may be provided with a washing pump and a drainage pump separately.

Reference numeral 13 denotes a filter for removing the residual foods in the washing water on the recess 5, 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 double-sided fan rotatably driven by a motor 24, 17 is a space between the cavity 1 and the rear plate 15,
A circulating air passage partitioned by the double-sided fan 16 and a cooling air passage 18 similarly partitioned by the double-sided fan 16. The circulation air passage 17 connects an exhaust port 19 provided at an upper portion of the rear surface of the cavity 1 and an intake port 20 at a lower portion of the rear surface, and the air in the cavity 1 is forced from the exhaust port 19 by a double-sided fan 16. The air that has been exhausted into the circulation air passage 17 and that has been dehumidified by heat exchange with the double-sided fan 16 is reintroduced from the intake port 20 into the cavity 1 again.
It is inhaling inside.

22 is provided on the rear surface side of the cavity 1,
A water supply valve serving as a water supply device for supplying cleaning water into the cavity 1, 23 is connected to the water supply valve 22, a water supply port provided in the circulation air passage 17, and 25 is a micro controller for controlling the sequence of cleaning, rinsing and drying. A control box that houses a computer and the like.

33 is a pipe 12 and a pump casing 11
Is a transmissivity detecting device which is provided in the connecting portion 26 and detects the transparency of the wash water (hereinafter referred to as the “transmittance”) by irradiating the wash water with light. The permeability detection device 33 includes a connecting portion 26 on the left side of the suction port 8 of the pump casing 11.
The light emission transmitting portion 27 formed of a light transmitting member on the wall surface of the light emitting element, the light emitting element 28 such as a diode for irradiating the suction port 8 with light through the light emission transmitting portion 27, and the light emitting element 28 including the light emission transmitting portion 27.
A light emitting element mounting portion 29 that is screwed to the pump casing 11 for fixing to the pump casing 11, and a light receiving and transmitting portion 30 formed of a light transmitting member that is provided on the right wall surface of the connecting portion 26 that faces 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 portion 30, and a screw-fastened to the pump casing 11 to fix the light-receiving element 31 to the light-receiving / transmitting portion 30. It is composed of a light receiving element mounting portion 32.

The pump 7 is mounted such that the position of the suction port 8 of the pump casing 11 is higher than the discharge port 6 of the recess 5 by about 15 mm. It is drained from the cavity 1 by the pump 7 and reaches the water level of B in FIG.
Air enters the pump casing 11 from the gap between the discharge port 6 of the recess 5 and the water surface of the water level B to cause air bite, and the wash water below the water level of B cannot be drained, and the residual water emits light. If the portion 27 and the light receiving / transmitting portion 30 are soaked for a long period of time, water stains will adhere and act to reduce the amount of light transmission. Therefore, in order to avoid this, the degree of transmission is detected to the extent that the remaining water is not soaked. This is because the device 33 had to be installed high.

Reference numeral 40 denotes a detergent feeding device provided with a detergent accommodating portion provided on the inner surface of the door 2. When the dish is accommodated in the cavity 1, the detergent accommodating portion is accommodated in the detergent accommodating portion, and when the washing process is started, the detergent accommodating portion 40 The lid is opened and the detergent is put into the cavity 1.

In FIG. 4, reference numeral 34 denotes a water level detecting device 3 for detecting whether or not the water level in the cavity 1 has reached a specified water level.
5 is a water level detection box, 36 is a water supply solenoid that opens and closes the water supply valve 22, 37 is a key device such as a start key arranged on an operation panel (not shown) provided on the door 2, and 38 is a control box 25. A microcomputer (hereinafter referred to as a microcomputer) serving as a control unit housed therein, and the microcomputer 38 includes a timer 39 for measuring time.
Is equipped with.

The water level detection box 34 is a cavity 1
Further, the water level detection device 35 is composed of a float and a limit switch that outputs a detection signal in association with the rise of the float when detecting the specified water level. Then, the water level in the water level detection box 34 rises as the water level of the washing water in the cavity 1 rises, and the float rises as the water level rises.
When the cleaning water of the specified water level is supplied inside, the limit switch is operated in conjunction with the rise of the float, and the detection signal is output.

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

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

Normally, since water is not supplied, step S
5, the water supply solenoid 36 is energized to supply the water supply valve 22.
Open for 1 minute to supply water. Timer 3 in step S7
When it is determined that the time of 9 has elapsed for 1 minute, the energization of the water supply solenoid 36 is stopped in step S8, the water supply valve 22 is closed, and the water supply is stopped.

If it is determined in step S1 that the cleaning water having the specified water level has already been supplied to the cavity 1, the pump 7 is operated until the reset water level of the water level detecting device 35, that is, the water level in the cavity 1 becomes zero in step S2. When the water level is determined to be zero in step S3, the pump 7 is stopped in step S4 to stop the drainage before the above operation is performed. Further, during the water supply for one minute, it is detected in step S6 whether or not the specified water level is detected by the water level detection device 35. If the specified water level is detected, the water supply valve 22 is closed in step S9 to stop the water supply. The operation is restarted from the operation of step S2 described above.

When the water supply is stopped in step S8, the pump 7 is subsequently reversed in step S9 to start draining,
It continues until the water level detection device 35 reaches the reset water level in step S10. If the reset water level is reached, step S1
In step 2, the water supply valve 22 is opened to start supplying the cleaning water used in the washing process. When the water level detection device 35 detects the specified water level in step S13, the water supply valve 22 is closed to stop the water supply in step S14, and the process proceeds to the next washing step. In the washing step, first, the detergent is put into the cavity 1 from the detergent feeding device 40.
After being put into the inside, the pump 7 is rotated in the normal direction to start the washing operation.

If the above operation is repeated every time the washing operation is started, the washing process can always be started from a clean state of the washing water, and in particular, the dishwashing / drying equipped with the permeability detecting device described in the above-mentioned embodiment. Since the standard value of the permeability is usually detected in the machine before the washing step, the standard value is not determined by the cloudy cleaning water, and the cleaning time does not become longer by that amount.

[0026]

According to the present invention, since the washing operation can always be started with clean washing water, the washing ability is not deteriorated and the offensive odor caused by the propagation of various bacteria in the washing water is eliminated.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a dishwasher / dryer according to the present invention.

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

3 is a cross-sectional view taken along the line AA in FIG.

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]

 1 Cavity 7 Cleaning / Drainage Pump 22 Water Supply Valve 35 Water Level Detection Device 38 Microcomputer

Claims (1)

[Claims] 1. A cavity for storing dishes, 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, and A washing pump for injecting washing water to the dishes, a drainage device for draining the washing water in the cavity, and a control unit for controlling the drainage device, the washing pump and the water supply device to execute a washing operation,
At the start of the cleaning operation, the control unit drives the water supply device for a certain period of time, then drives the drainage means to drain the cleaning water in the cavity, and then outputs a detection signal from the water level detection device. The dishwasher / dryer is characterized in that the water supply device is driven until