JP3162979B2 - Dishwasher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a dishwasher.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a dishwasher in which hot water is supplied from an external hot water supply source such as a hot water heater. However, in this method, cold water remaining in the path from the external hot water supply source to the dishwasher (hereinafter referred to as dead water) may be supplied first, and the temperature of the supplied hot water decreases. There was a problem that the detergent was not activated and the cleaning efficiency was reduced.

On the other hand, when the supplied hot water is at a low temperature, a washing step using a detergent is not performed suddenly, but a pre-washing step without using a detergent is first performed using the low-temperature water. There is a dishwasher. For example, such a dishwasher is disclosed in Japanese Utility Model Laid-Open Publication No. Sho 59-162868 (A47L).
15/46).

[0004]

In the apparatus disclosed in the above-mentioned publication, a device for supplying a detergent by the operation of an electric component such as a solenoid is used as a detergent introduction device. In such a device, the structure is inevitably complicated and the cost is high.

[0005] Therefore, as a simple and inexpensive detergent charging structure, a detergent accommodating chamber is provided in the washing chamber, and an inflow / outflow port of water into the chamber is provided in the detergent accommodating chamber. Using the water injected from the injection device,
It is conceivable to adopt a structure in which the detergent flows out from the detergent storage chamber into the cleaning chamber. However, in this case, there is a problem that the jet water enters the detergent accommodating chamber at the time of pre-washing and the detergent flows out.

SUMMARY OF THE INVENTION The present invention relates to a dishwashing machine, which solves such a problem. In a dishwasher provided with a detergent supply device for supplying a detergent by using water jetted from a jetting device, the present invention relates to a dishwasher. When the temperature of the hot water is low and the pre-washing process is performed, the purpose is to ensure that the detergent is used at the next washing process without leaking the detergent during the pre-washing process. It is.

[0007]

According to a first aspect of the present invention, there is provided a dishwasher comprising: a washing chamber for accommodating dishes; a water supply device for supplying hot water from an external hot water supply source into the washing chamber;
A temperature sensor that detects the temperature of the hot water supplied into the cleaning chamber, an injection device that is disposed at the bottom of the cleaning chamber, and injects hot water stored in the room toward tableware above, and hot water in the cleaning chamber. A drainage device for discharging, disposed at an upper portion in the cleaning chamber, containing a detergent therein and having an inflow / outflow port of the injection water from the injection device, and allowing the internal detergent to flow into the cleaning chamber by the injection water. A control section for controlling the operation of the detergent accommodating chamber, the water supply device, the jetting device and the drainage device, and sequentially executing a washing process of washing dishes with washing water containing detergent, and a rinsing process of dropping detergent that has arrived at the dishes. With
When the hot water temperature detected by the temperature sensor is higher than a predetermined temperature, the control unit operates the spraying device at a spraying pressure at which the spraying water reaches the detergent accommodating chamber to execute a washing process, and the temperature sensor When the hot water temperature detected at is lower than the predetermined temperature, prior to the washing step, the spray device is operated at a spray pressure at which the spray water does not reach the detergent accommodating chamber,
A pre-washing step is performed.

[0008] The dishwasher according to claim 2 of the present invention comprises:
In the configuration of claim 1, the washing time in the washing step when the pre-washing step is not performed is longer than the washing time in the washing step when the pre-washing step is performed.

A dishwasher according to a third aspect of the present invention comprises:
In the configuration of claim 1 or 2, a plurality of the inflow ports are provided over different side walls of the detergent storage chamber.

[0010]

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a dishwasher according to an embodiment of the present invention, 2 denotes a metal machine frame, and 3 denotes a machine frame 2.
This is a washing room for resin molded products arranged in the inside.

Reference numeral 4 denotes a tableware insertion port provided at the front of the washing room 3. A tableware basket 18 containing the tableware is put into the washing room 3 from here. Reference numeral 5 denotes a door for opening and closing the input port 4, which is pivotally supported at the lower end, and opens forward with the lower end as a fulcrum.

Reference numeral 6 denotes an operation panel provided below the door 5. Reference numeral 7 denotes a control box mounted on the back surface of the operation panel 6, and contains electrical components such as a microcomputer (described later), which is the center of the control mechanism of the dishwasher 1.

Reference numeral 8 denotes a nozzle tower provided substantially at the center of the bottom of the washing chamber 3, and reference numeral 9 denotes a long nozzle body rotatably supported in a horizontal direction by the nozzle tower 8.
A plurality of injection ports 10 are formed on the upper surface of the nozzle body 9. In addition, propulsion injection ports (not shown) are provided on both sides of one end of the nozzle body 9, and the propulsion nozzle is provided inside the nozzle body 9 every time the rotation of the nozzle body 9 stops. A reversing mechanism (not shown) including a changing closing ball valve or the like for changing one of the injection ports is provided. The reversing mechanism causes the nozzle body 9 to perform reversing rotation.

Reference numeral 11 denotes a cleaning pump arranged at the outer bottom of the cleaning chamber 3. The cleaning water and hot water, which is stored at the bottom of the cleaning chamber 3, becomes the nozzle through the nozzle tower 8. Send to body 9.

In this way, at the time of washing and rinsing, the washing pump 11 is operated, and the washing water (rinsing water) is circulated, and the washing water is jetted from the nozzle body 9 toward the upper tableware. The nozzle tower 8, the nozzle body 9, and the cleaning pump 11 constitute an injection device of the present invention.

Reference numeral 12 denotes a drainage tank formed at the front of the bottom surface of the cleaning chamber 3 and connected to the cleaning pump 11. Reference numeral 13 denotes a filter provided above the drainage tank 12 for collecting debris such as garbage left from tableware.

Reference numeral 14 denotes a drainage pump connected to the drainage tank 12 for discharging water (hot water) in the washing chamber 3 through a drainage hose 15 to the outside of the machine. The drainage pump 14 and the drainage hose 15 constitute a drainage device of the present invention.

Reference numeral 16 denotes a loop-shaped sheathed heater provided from the vicinity of the center of the bottom of the cleaning chamber 3 to the rear thereof, and additionally heats hot water in the cleaning chamber according to the situation during cleaning, and cleans the inside of the cleaning chamber 3 during drying. It raises the temperature and enhances the washing and drying effects.

Reference numeral 17 denotes a water level detection chamber which is provided at a lower rear portion of the cleaning chamber 3 and communicates with the cleaning chamber 3 and has a float (not shown) disposed therein. Then, the water level in the cleaning chamber 3 is detected by the vertical movement of the float. A water supply pipe described later is connected to one end of the top surface of the water level detection chamber 17, and water (hot water) supplied from the water supply pipe flows into the cleaning chamber 3 through the water level detection chamber 17.

Reference numeral 19 denotes a water supply pipe connected to the water level detection chamber 17, and is connected to an external water supply source such as a water heater.
An electromagnetic water supply valve 20 is provided in the middle of the water supply pipe 19, and water supply (hot water supply) is controlled by opening and closing the water supply valve 20. The water supply pipe 19 and the electromagnetic water supply valve 20 constitute a water supply device of the present invention.

Reference numeral 21 denotes a temperature sensor attached to the outer bottom surface of the cleaning chamber 3. As the temperature sensor 21, for example, a thermistor is used.

Reference numeral 22 denotes a circulation air passage provided at the rear of the washing chamber 3, which takes in the air in the washing chamber 3 from an outlet 23 provided at the upper part of the rear wall, and introduces air into the lower part of the rear wall. The air is circulated by returning from the port 24. Reference numeral 25 denotes a cooling air passage provided behind the circulation air passage 22 to allow outside air to pass therethrough. Reference numeral 26 denotes a double-sided fan provided so as to separate the circulation air passage 22 from the cooling air passage 25. And the air in the cooling air passage 25 is simultaneously forcedly circulated,
The air in the circulation air passage 22 is subjected to heat exchange with the air in the cooling air passage 25 to remove moisture. 27 is a fan motor for driving the double-sided fan 26.

Reference numeral 28 denotes a detergent accommodating case which is attached to the top surface of the washing chamber 3 near the inlet 4 and serves as the detergent accommodating chamber of the present invention. This detergent storage case 28
In this case, the user puts in the detergent used in the washing process of the washing operation before the washing operation. As shown in FIG. 2, the detergent storage case 28 includes an inner case 29 for storing a detergent, and an outer case 30 surrounding the inner case 29.

The outer case 30 has an upper surface, a front surface, and a rear surface that are open. A flange 32 is integrally formed at the upper end of both side walls 31. The outer case 30 is cleaned by the flange 32. It is attached to the top surface of the chamber 3 with a screw or an adhesive. Each of the side walls 31 is provided with a side inflow / outlet 33 having six ports. The opening on the rear surface is a rear surface inflow / outflow port 34.
That is, the inflow / outflow ports are provided on the left, right, and rear three side walls. These inflow / outflow ports 33 and 34 are entrances / outlets through which the jet water jetted from the nozzle body 9 flows into and out of the detergent accommodating case 28.

The inner case 29 includes a lid 35 for closing the front of the outer case 30 when the case 29 is accommodated in the outer case 30, and a mounting plate provided on the back side of the lid 35, on which a detergent is placed. 36. The lid 35 has an inner case 29
A handle 37 is provided when the user takes in and out of the outer case 30. On both sides of the mounting plate 36, guard ribs 38 for guiding the detergent to the rear side are integrally formed.

FIG. 3 shows a control mechanism of the dishwasher 1 of the present embodiment. Reference numeral 39 denotes a microcomputer (hereinafter, referred to as a microcomputer), which comprises a storage unit 40, a control unit 41, a timer unit 42, and the like. .

The storage section 40 stores a control program indicating a control procedure in the cleaning operation. The washing operation is an operation in which a washing operation and a rinsing operation are sequentially performed. As will be described in detail later, when the temperature of the supplied hot water is low, a pre-washing step is performed prior to the washing step.

The control section 41 controls various loads on the output side in accordance with the control program based on various inputs.

An operation key group 43 includes setting keys for setting various operating conditions in the cleaning operation, a start key for starting the cleaning operation, and the like. The operation keys 43 are arranged on the operation panel 6. 4
Reference numeral 4 denotes a water level switch that is turned ON / OFF by the above-described float operation. The operation key group 43, the water level switch 44 and the temperature sensor 21 are connected to the microcomputer 39.
Is connected to the input side.

Reference numeral 45 denotes a cleaning motor for driving the cleaning pump 11, and reference numeral 46 denotes a drain motor for driving the drain pump 14. Reference numeral 47 denotes a buzzer device for notifying the end of the cleaning operation and the occurrence of an abnormality. Reference numeral 48 denotes a display device for indicating the progress of the cleaning operation and for notifying the occurrence of an abnormality.

Reference numeral 49 denotes a load drive circuit provided between the output side of the microcomputer 39 and the washing motor 45, the drain motor 46, the water supply valve 20, and the fan motor 27.
This load drive circuit 49 is composed of, for example, a triac. The load drive circuit 49 is provided with the microcomputer 3
In accordance with the control signal from 9, a commercial power supply (for example, 100 V AC power supply) is supplied to each load such as the washing motor 45, and these are operated.

Next, the operation of the present invention based on the above configuration will be described with reference to FIGS. First, in the main routine shown in FIG. 4, if it is determined in S1 that the start key has been pressed, the control unit 41 turns on the water supply valve 20 to supply hot water (S2). Then, when the hot water in the cleaning chamber 3 reaches a predetermined water level, the water supply valve 20 is turned off to terminate the hot water supply. In S3, the temperature of the hot water in the cleaning chamber 3 is detected by the temperature sensor 21,
It is determined whether this temperature T is equal to or higher than a predetermined temperature T0 (for example, 50 ° C.). When the temperature is equal to or higher than the predetermined temperature T0, it is considered that the detergent is sufficiently activated.

If it is determined in S3 that T ≧ T0, the control unit 41
Executes the washing process routine shown in FIG.

In the washing process, the control unit 41 drives the washing motor (washing pump) by turning on for 28.5 seconds and turning off for 1.5 seconds, and rotates the nozzle body 9 reversely at one-minute intervals (S4-
1). At this time, the injection pressure of the nozzle body 9 becomes full force (maximum), and the injection water reaches the detergent containing case 28. The jet water that has entered from the inflow / outflow ports 33 and 34 of the detergent accommodating case flushes out the detergent, and the flushed out detergent flows out into the cleaning chamber 3 mainly through the rear inflow / outflow port 34 and is mixed with the hot water in the cleaning chamber 3. . Note that the detergent is difficult to flow out from the side direction due to the obstruction of the guard ribs 38 of the inner case 29. Thus, in the washing process, the dishes are washed with hot water (wash water) containing a detergent component.

Next, when the control section 41 determines that a predetermined washing time (for example, 12 minutes) has elapsed (S4-2), it further determines whether or not a pre-washing step has been performed (S4-).
3). Since the pre-washing step has not been performed this time, the cleaning motor 45 is continuously driven until the additional time (for example, one minute) elapses (S4-4), and thereafter, the process proceeds to (S4-5) to switch the cleaning motor 45. Stop and end the washing process.

When the washing process is completed, the process returns to the main routine, in which the washing water in the washing chamber 3 is discharged in S5.
In steps 6 to S9, a rinsing step of dropping the detergent on the tableware and a drying step of drying the tableware are sequentially performed.

By the way, dead water exists in the path from the hot water supply source to the dishwasher 1, and when the dead water is supplied first, the temperature of the supplied hot water may decrease. In such a case, if it is determined that T <T0 in S3 of the main routine, the control unit 41 executes a pre-washing step routine shown in FIG.

In the pre-washing process, the control unit 41 sets the cleaning motor 45 (the cleaning pump 11) to ON for 0.1 second and OFF for 1 second.
Is driven (S10-1). This allows the cleaning motor 45
Operates in a state where the number of revolutions is considerably reduced, so that the discharge pressure of the cleaning pump 11 decreases, and as a result, the injection pressure of the nozzle body 9 decreases. In this way, the jet water reaches the tableware above it, but does not reach the detergent storage case 28 thereabove. As a result, no detergent is supplied from inside the detergent storage case 28, and the dishes are pre-washed with hot water containing no detergent.

When the pre-washing time (for example, 1 minute) has elapsed (S10-2), the controller 41 causes the cleaning motor 45 to operate.
Is stopped (S10-3), and the pre-washing process ends.

When the pre-washing step is completed, the control section 41 returns to the main routine, drains the water in S11 and supplies hot water in S12, and then executes the above-described washing step routine. However, this time, since the pre-washing process is being performed, no additional time washing is performed, and when the washing time elapses in (S4-2),
Immediately, the process proceeds to (S4-5), where the cleaning motor 45 is stopped and the cleaning process is completed.

As described above, in the dishwasher of the embodiment of the present invention, dead water is used for pre-washing, so that water is not wasted.

In addition, since the detergent supply device has a simple structure including only a detergent accommodating case having an inlet and an outlet for the injection water, the cost is reduced, and even with such a structure, the pre-washing is performed. Since the injection pressure of the nozzle body is sometimes controlled so that the injection water does not reach the case, the detergent can be reliably used at the next washing operation without leaking the detergent at the time of pre-washing.

Further, the washing time in the washing step when the pre-washing step is not performed is (washing time + additional time), which is longer than the washing time (washing time) in the washing step when the pre-washing step is performed. Therefore, when the pre-washing step is not performed, the cleaning ability for the pre-washing step can be sufficiently supplemented in the washing step.

If the inflow / outflow port of the detergent accommodating case is provided only on one side wall, there is a possibility that the incoming water and the outgoing water may interfere with each other and the detergent may not flow well. In this case, since a plurality of inflow / outflow ports of the detergent accommodating case are provided on different side walls of the side walls and the rear wall, unlike the case where the inflow / outflow port is provided on only one side wall, the jet water flowing into the case is different from that of the case. Comes out of the case smoothly. Therefore, the detergent can be smoothly poured out.

[0046]

In the dishwasher according to the first aspect of the present invention, since the prewashing is performed using dead water, water is not wasted.

In addition, since the detergent supply device has a simple structure including only the detergent accommodating chamber provided with the inlet and outlet of the injection water, the cost is reduced, and even with such a structure, the pre-washing is performed. Since the injection pressure of the nozzle body is sometimes controlled so that the injection water does not reach the detergent accommodating chamber, the detergent can be reliably used at the next washing operation without leaking the detergent at the time of pre-washing.

In the dishwasher according to the second aspect of the present invention, the washing time in the washing step when the pre-washing step is not performed is longer than the washing time in the washing step when the pre-washing step is performed. Therefore, when the pre-washing step is not performed, the cleaning ability for the pre-washing step can be sufficiently supplemented in the washing step.

In the dishwasher according to the third aspect of the present invention, since a plurality of inlets and outlets of the detergent accommodating chamber are provided on different side walls of the side walls and the rear wall, the inlet and outlet are provided only on one side wall. Unlike the case, the jet water flowing into the detergent accommodating chamber smoothly exits the room.
Therefore, the detergent can be smoothly poured out.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing a structure of a detergent accommodating case.

FIG. 3 is a block diagram showing a control mechanism.

FIG. 4 is a flowchart showing a main routine of a cleaning operation.

FIG. 5 is a flowchart showing a routine of a washing step.

FIG. 6 is a flowchart illustrating a routine of a pre-washing step.

[Explanation of symbols]

 3 Cleaning Room 8 Nozzle Tower (Injection Device) 9 Nozzle Body (Injection Device) 11 Cleaning Pump (Injection Device) 14 Drain Pump (Drainage Device) 15 Drain Hose (Drainage Device) 19 Water Supply Pipe (Water Supply Device) 20 Electromagnetic Water Supply Valve ( Water supply device) 21 Temperature sensor 28 Detergent storage case (detergent storage room) 29 Inner case 30 Outer case 41 Control unit

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kenji Yamane 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-5-277057 (JP, A) JP-A-8-24202 (JP, A) JP-A-9-135802 (JP, A) JP-A-9-140654 (JP, A) JP-A-9-168500 (JP, A) JP-A-5-211975 (JP JP-A-5-146391 (JP, A) JP-A-6-17663 (JP, U) JP-A 52-143270 (JP, U) JP-A 62-143470 (JP, U) JP-A 59-162868 (JP, U) JP-A 62-184856 (JP, U) Patent 2595690 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47L 15/44 A47L 15/46

Claims (3)

(57) [Claims] A washing chamber for accommodating tableware, a water supply device for supplying hot water from an external hot water supply source into the washing chamber; a temperature sensor for detecting a temperature of the hot water supplied into the washing chamber; An injection device that is disposed at the bottom of the cleaning room and injects hot water stored in the room toward the upper tableware, a drainage device that discharges hot water in the cleaning room, A detergent containing chamber for containing a detergent into the washing chamber and having an inflow / outlet port of the spray water from the spray device, and for discharging the internal detergent into the washing chamber by the spray water, and controlling operations of the water supply device, the spray device, and the drain device. And a control unit for sequentially executing a washing step of washing dishes with washing water containing a detergent and a rinsing step of dropping the detergent that has arrived at the dishes, wherein the control unit detects the hot water temperature detected by the temperature sensor. Is higher than the predetermined temperature Operating the injection device at an injection pressure at which the injection water reaches the detergent accommodating chamber to execute a washing step, and when the hot water temperature detected by the temperature sensor is lower than a predetermined temperature, prior to the washing step, Operating the injection device at an injection pressure at which the injection water does not reach the detergent storage chamber,
A dishwasher characterized by performing a pre-washing step. 2. The dishwasher according to claim 1, wherein a washing time in the washing step when the pre-washing step is not performed is longer than a washing time in the washing step when the pre-washing step is performed. 3. The dishwasher according to claim 1, wherein a plurality of the inlets and outlets are provided over different side walls of the detergent storage chamber.