JP3066240B2 - 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 more particularly to a dishwasher capable of receiving hot water from a water heater.

[0002]

2. Description of the Related Art Dishwashing / drying machines employ pre-washing with water, washing with warm water heated by a heater, rinsing with water or hot water, and heating the heater in the washing tank after draining the water in the washing tank. The dish is washed and dried by drying, and the heater is used not only for drying but also for heating water to enhance the washing effect and the rinsing effect.

[0003] However, when the water temperature is extremely low as in winter, heating with a heater is performed in order to shorten the time required for increasing the water temperature, especially the time required for drying by performing the heating prior to drying. Since the time required for warm water rinsing becomes extremely long, a dishwasher that can reduce the operation time by receiving hot water from a water heater has recently been provided. In this case, a pre-cleaning step, a main cleaning step, a plurality of rinsing steps, a warm water rinsing step, and a step of performing washing and drying in a drying step,
Normally, hot water is supplied from a water heater in the final washing step of the main washing step, the warm water rinsing step, and the multiple rinsing steps, and water is used in the other steps.

[0004] By the way, when receiving hot water from a water heater, there is a problem with cold water in a pipe from the water heater to the dishwasher. The presence of the cold water results in a decrease in the temperature in the cleaning tank and an increase in the heater load, despite receiving hot water from the water heater. For this reason, in the dishwasher connected to the water heater, when receiving the hot water from the water heater, the hot water valve is opened and the drainage pump is operated for a while to discharge the cold water in the pipe. However, if cold water purging in a conventional dishwasher is using water in the process before receiving hot water, the opening operation of the hot water supply valve and the discharge pump With the operation, hot water below a predetermined temperature is only discharged.

[0005]

In this case, the time required for the chilled water purge directly affects the total operation time, and the supplied water is discharged as it is, thus wasting water. Will be. Further, even if the temperature is higher than the temperature of water, the water is discharged if the temperature is equal to or lower than a predetermined temperature, which means that heat is wasted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to perform a cold water purge, and to reduce the total operation time and to effectively use heat in dishwashing and drying. To provide a machine.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention relates to a dishwasher / dryer having a cold water purge function for discharging low-temperature hot water from a pipe to a water heater when receiving hot water from the water heater. It is characterized in that it is provided with a control circuit which is a step preceding the step of receiving hot water from the water heater and supplying water equivalent to the cold water purge from the water heater at the time of water supply in the step of using water. ing.

[0008]

According to the present invention, the water supply in the step before receiving the hot water supply from the water heater and the drainage at the end of the step also serve as the cold water purge, so that no time is required for the cold water purge. At this time, the supply of water corresponding to the cold water purge can be controlled by the time required for the cold water purge.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. As shown in FIG. 2, this dishwasher / dryer has a washing tank 10, a washing pump 11, a drainage pump 12, a fixed nozzle 13, The spray nozzles 14 and 15 and the heater 16 are provided. The cleaning pump 11 sends the cleaning water stored in the lower part of the cleaning tank 10 to each of the nozzles 13, 14, 15. Of the nozzles 13, 14, and 15, the spray nozzles 14, 15 disposed above and below the cleaning tank 10 are rotated by the jet pressure of water. Further, a water supply pipe 30 having a water supply valve 31 and a water supply pipe 35 having a hot water supply valve 36 are provided.
Hot water supply pipe 35 is connected to the hot water supply device. In the figure, 3 is a temperature detecting element installed at the bottom of the cleaning tank 10, 19 is a normal water level detecting pressure switch, and 32 is a filter.

Now, the dishes are set in the washing tank 10 and the exclusive detergent and the dry finish are respectively supplied to the detergent introduction device 1.
After setting in 7 and the finishing agent input device 18, if the door is closed, the door switch is turned on and the operation preparation is completed.
In this state, when the power switch for the control circuit of the operation panel is turned on and the start switch is pressed, a control constituted by a microcomputer for controlling the cleaning pump 11, the drain pump 12, the heater 16, the water supply valve 31, the hot water supply valve 36, and the like. Under the control of the circuit (not shown), the washing and drying on the selected course is started.

As the course, a standard course, a powerful course, and a speedy course are prepared here.
In the washing and drying in the standard course, a preliminary water supply step in which a small amount of water is poured into the washing tank 10 and then the water is discharged. After the washing step, a predetermined amount of warm water and detergent are put into the washing tank 10, the washing pump 11 and the heater 16 are operated, and then the main washing step of draining is performed. After the water is put into the washing tank 10, the washing pump 11 is operated. A water rinsing step for draining (this is performed twice), a hot water rinsing step for putting hot water in place of water, and putting hot water into the washing tank 10 to operate the washing pump 11 and the heater 16 and then draining the water. At the same time, it is performed by a warm water rinsing step in which a dry finish is charged from the finish feeder 18 immediately before drainage, and a drying step by heating air in the cleaning tank 10 by the heater 16. Operation details of the cleaning and rinsing process will be described in detail with reference to the flowchart of FIGS. 3-8.

In the pre-cleaning step, as shown in FIG. 3, the water supply valve 31 is opened, water is supplied to a water level at which the normal water level detecting pressure switch 19 is turned on, the cleaning pump 11 is operated, and then the drain water is discharged. Is done. In the next main cleaning step, first, a cold water purge is performed, and the time required for the cold water purge is measured. That is, as shown in FIG. 4, when the hot water supply valve 36 is opened and hot water from the water heater is introduced into the washing tank 10 after the setting of the 60-second timer, the drain pump 12 is simultaneously operated and the hot water supply valve 36 is set. Temperature sensing element 37 installed near
When the temperature Th of the hot water detected by the above exceeds a predetermined temperature Ts (for example, 55 ° C.), the drain pump 12 is stopped. Until the temperature Th of the supplied hot water reaches the predetermined temperature Ts, the hot water supplied by the drain pump 12 is discharged. For this reason, the hot water that enters the cleaning tank 10 immediately after the start of hot water supply. Is cold dead water in the piping, or the water temperature is low due to the influence of the rise of the water heater, etc., this hot water is eliminated, and only the hot water having a temperature equal to or higher than the predetermined temperature Ts enters the washing tank 10. Since the water is stored, it is not necessary to heat the heater 16 in order to obtain the required temperature for the main cleaning or the hot water cleaning, and it is not necessary to increase the amount of heating by the heater 16.

The time required for the cold water purge is determined by a timer T
It is measured by 1. Further, even if the temperature Th of the hot water detected by the temperature detecting element 37 is equal to or lower than the predetermined temperature Ts,
The drain pump 12 is stopped 60 seconds after the hot water supply valve 36 is opened and the drain pump 12 is operated. In the case where the heated water is not supplied due to some abnormality in the water heater, low-temperature hot water (cold water) is received, and the heated water is heated to the required temperature by the heater 16 and used. Washing and drying can be performed without delay.

In the above embodiment, the temperature of the hot water supplied through the hot water supply pipe 35 is detected by the dedicated temperature detecting element 37 disposed near the hot water supply valve 36. The temperature detecting element 3 is disposed so that hot water flowing into the cleaning tank 10 from the hot water supply pipe 35 is applied to the temperature detecting element 3.
May be detected.

After the cold water purge is performed,
Hot water is supplied from the water heater to the water level at which the normal water level detection pressure switch 19 is turned on. After the time required for the hot water supply is measured by the timer T2, the supply of the detergent and the operation of the cleaning pump 11 are started. At the same time, the hot water is heated to a predetermined temperature by the heater 16, and after a lapse of a predetermined time, the cleaning operation is stopped and drainage is performed by operating the drainage pump 12.

In the next water rinsing step, as shown in FIG. 5, water supply by opening the water supply valve 31, operation of the washing pump 11, and operation of the drainage pump 12 are performed. Thereafter, the water rinsing step is performed again. However, since the next step is a hot water rinsing step in which hot water is supplied from the water heater, the water is supplied in the second water rinsing step, and the hot water is supplied from the water heater. The cooling water purge also serves as a cooling water purge. That is, as shown in FIG. 6, a value obtained by subtracting the time required for the cold water purging from the time required for the hot water supply in the main cleaning step (timer T2-timer T1) is set in the timer T3 and counted by the timer T3. The water supply valve 31 is opened for a period of time to supply water. Thereafter, the water supply valve 31 is closed and the hot water supply valve 36 is closed.
Is opened to receive the supply of hot water from the water heater to a water level at which the normal water level detection pressure switch 19 is turned on. Then, after the rinsing operation by operating the cleaning pump 11, drainage by the drainage pump 12 is performed.

In the hot water rinsing process which is the next process, hot water is supplied from the water heater. The cold hot water in the pipe between the machine and the machine is consumed as water for rinsing in the water rinsing step, and is also required from the end of water supply (hot water supply) in the water rinsing step to the start of the hot water rinsing step. Since the time is short, in the hot water rinsing step, as shown in FIG. 7, the hot water is immediately supplied from the water heater to the normal water level without performing the cold water purge, and the washing is performed by the operation of the cleaning pump 11, Rinsing by operation of the drainage pump 12 is performed.

Then, in the hot water rinsing step, as shown in FIG. 8, the hot water introduced by opening the hot water supply valve 36 is further heated by the heater 16 and a dry finishing agent is charged. When the temperature reaches a predetermined temperature, the cleaning pump 11 and the heater 16 are turned off,
Drainage is performed by the drainage pump 12 and then the heater 16
The drying process is performed by heating the air in the cleaning tank 10 by intermittently turning on and off the, and the entire process of dishwashing and drying is completed by the completion of the drying process. The heating by the heater 16 in the hot water rinsing step is performed not for rinsing but for shortening the time required for the next drying step by heating. The addition of the dry finish is for suppressing vitiligo due to minerals contained in the water.

The cold hot water in the pipe between the water heater and the dishwasher, which would otherwise be discarded by performing the cold water purge when entering the hot water rinsing step, is used in the water rinsing step, which is the preceding step. It is consumed as rinsing water, which not only results in efficient use of water, but also
As shown in the figure, the time t required for performing the cold water purge P
1 is no longer necessary, so that the total operation time can be shortened, and the hot water in the pipe between the hot water heater and the dishwasher / dryer can be cooled, but the main cleaning process can be performed. Because it is once high temperature,
Since the temperature is certainly higher than the water supplied through the water supply valve 31 and gradually increases as hot water is supplied, the temperature of the water used for rinsing in the second water rinsing step is determined by the water supply valve. Since it is certainly higher than when only water supplied through 31 is used, the temperature drop in the cleaning tank 10 is suppressed,
For this reason, the heating load by the heater 16 in the hot water rinsing step following the hot water rinsing step is reduced, and the time required for heating is shortened (t3-t2 is the time difference in the hot water rinsing step). The total operation time can be reduced. In FIG. 1, the solid line indicates the case according to the present embodiment, and the broken line indicates the case where the cold water purge P is performed at the beginning of the hot water rinsing step.

The amount of water to be supplied to the washing tank 10 or hot water may be detected by a flow meter or the like instead of detecting the water level in the above-described embodiment, or may be controlled by the time of a water supply timer. 9 to 14 show flowcharts of a pre-cleaning step, a main cleaning step, a first water rinsing step, a second water rinsing step, a hot water rinsing step, and a hot water rinsing step when a water supply timer is used. In the second water rinsing step, the hot water supply time is controlled using the water supply timer and the timer T1 for measuring the time required for the cold water purge.

[0021]

As described above, according to the present invention, at the time of supplying water in the step preceding the step of receiving hot water from the water heater and using water, the supply of water equivalent to the cold water purge is provided. Since the water supply in the process before receiving hot water from the water heater and the final drainage in the process also serve as a cold water purge, water that would be discarded with a normal cold water purge is effective. In addition to being available,
This eliminates the need for the time for purging the cold water, and the temperature of the water at this time is:
Since the temperature is definitely higher than when only water is used, the temperature drop in the cleaning tank is suppressed. Therefore, when the step of performing heating by the heater is to be postponed, the heating load by the heater is reduced. And the time required for heating is shortened, and the time for purging cold water is not required, so that the total operation time and the power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is an operation explanatory diagram in one embodiment.

FIG. 2 is a schematic sectional view of the same.

FIG. 3 is a flowchart of a pre-cleaning step according to the first embodiment.

FIG. 4 is a flowchart of a main cleaning step of the above.

FIG. 5 is a flowchart of a water rinsing step of the above.

FIG. 6 is a flowchart of a second water rinsing step of the above.

FIG. 7 is a flowchart of a hot water rinsing step of the above.

FIG. 8 is a flowchart of a hot water rinsing step of the above.

FIG. 9 is a flowchart of a pre-cleaning step in another embodiment.

FIG. 10 is a flowchart of a main cleaning step of the above.

FIG. 11 is a flowchart of a water rinsing step of the above.

FIG. 12 is a flowchart of a second water rinsing step of the above.

FIG. 13 is a flowchart of a hot water rinsing step of the above.

FIG. 14 is a flowchart of a warm water rinsing step of the above.

Continuation of the front page (56) References JP-A-59-144433 (JP, A) JP-A-3-131220 (JP, A) JP-A-52-109768 (JP, A) JP-A-60-168428 (JP, A) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47L 15/42-15/46

Claims (2)

(57) [Claims] 1. A dishwasher / dryer having a cold water purge function for discharging low-temperature hot water from a pipe to a hot water heater when receiving hot water from the hot water heater before a step of receiving hot water from the hot water heater. A dishwasher / dryer comprising a control circuit for supplying water equivalent to cold water purge from a water heater at the time of water supply in a step using water. 2. The dishwasher / dryer according to claim 1, wherein the supply of water corresponding to the cold water purge is controlled by the time required for the cold water purge.