JP3146224B2 - dishwasher - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher provided with a reservation timer device capable of setting an operation end time.

2. Description of the Related Art In recent years, dishwashers equipped with a reservation timer device capable of setting an operation end time have become widespread.

Heretofore, this type of dishwasher has generally been configured as shown in FIGS. Hereinafter, the configuration will be described.

As shown in the figure, a dishwasher main body (hereinafter, referred to as main body) 1 has a washing tank 2 installed therein. Cleaning pump 3
Is for circulating the washing water in the washing tank 2, and is rotated by the washing motor 4. The temperature detecting means 5 is composed of a thermistor and is attached to the bottom outer wall of the cleaning tank 2 to detect the temperature of the water in the cleaning tank 2. The water level detecting means 6 is attached to the lower outer wall of the cleaning tank 2 and detects the water level in the cleaning tank 2. Heater 7
Heats the washing water in the washing tank 2 and intermittently conducts electricity in the drying step to dry the tableware 8. The spray nozzle 9 sprays the washing water sent from the washing pump 3 through the spray hole 10 to wash the tableware 8 set in the tableware basket 11. Fan motor
Numeral 12 rotates in a drying step, and takes in outside air into the cleaning tank 2 through the casing 13 and discharges steam in the cleaning tank 2 to the outside through the exhaust port 14. The control means 15 receives outputs from the temperature detection means 5, the water level detection means 6 and the like, and loads loads 18 such as the washing motor 4, the heater 7, the fan motor 12, the water supply valve 16 and the drainage pump motor 17 via the drive means 19. Control, and sequentially control each step of washing, rinsing, and drying. Reservation timer device 20
Can set the operation end time. Reference numeral 21 denotes a switch that turns on and off in conjunction with opening and closing of the door 22.

When the operation is described in the above configuration, when the operation start time is calculated backward from the operation end time set by the reservation timer device 20, the operation of the cleaning process is started, and the operation is performed through the garbage filter 23 disposed at the inner bottom of the cleaning tank 2. The cleaning water sucked into the cleaning pump 3 is heated by the heater 7,
It is sent from the discharge side of the cleaning pump 3 to the injection nozzle 9 and is injected from the injection hole 10. This jet stream hits the tableware 8 set in the tableware basket 11 and cleans the tableware 8. After the completion of the washing process, the process proceeds to a rinsing process. Similarly, the tableware 8 is rinsed, and then the process proceeds to a drying process. In the drying step, after the cleaning liquid is discharged out of the apparatus, the heater 7 is intermittently energized to be in a state of idling. Further, the fan motor 12 rotates to discharge the steam in the washing tank 2 from the exhaust port 14 to the outside of the machine, thereby drying the tableware 8.

Problems to be Solved by the Invention In such a conventional dishwasher, the sequence from washing to drying is fixed in the case of sticky soil that has been left for a long time, even if it can be sufficiently washed in the case of normal soil. May not be cleaned. In particular, starchy stains such as rice have a tendency to stick to tableware with time, and in particular, when left for a long time until the operation start time set by the reservation timer device 20, there is a problem that cleaning performance cannot be secured. .

The purpose of the present invention is to solve the above-mentioned problem, and an object of the present invention is to make it possible to reliably wash even sticky dirt left for a long time.

Means for Solving the Problems In order to achieve the above object, the present invention can control a load of a cleaning pump, a heater, and the like, and control each step of cleaning, rinsing, and drying, and can set an operation end time. A reservation timer device, wherein the control means extends the time of the cleaning step when the difference between the time when the reservation setting is made, the operation start time, and the operation start time exceeds a predetermined time. This is the first problem solving means. Further, the control means of the first problem solving means extends the cleaning process time substantially in proportion to the difference between the time when the reservation setting is made and the operation start time.
Means to solve the problem. Also, the control means of the first problem solving means may extend the time of the cleaning step in a stepwise manner in response to an increase in the difference between the time when the reservation setting is made and the operation start time. 3 means for solving the problem.

Effects According to the first aspect of the present invention, the cleaning performance can be ensured even if the dish is left for a long time and the dirt sticks to the tableware strongly after the reservation is set until the operation is actually started.

Further, according to the second and third means for solving the problem, the cleaning time can be extended according to the strength of the sticking of dirt, and the cleaning performance can be secured.

Embodiment An embodiment of the present invention will be described below with reference to FIG. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

As shown in the figure, the reservation timer device 24 includes a current time setting means and a reservation time (neither is shown), and sets an operation end time. The control means 25 receives the outputs of the temperature detecting means 5, the water level detecting means 6 and the like, controls the load 18 via the driving means 19, successively controls each of the washing, rinsing and drying steps, as well as a reservation timer device. If the difference between the time when the reservation setting is made by 24 and the operation start time exceeds a predetermined time (for example, 1 hour), the cleaning time is extended from 20 minutes to 30 minutes, for example, by 10 minutes.

The operation of the above configuration will be described with reference to FIG. 2 and FIG.

The reservation timer device 24, when the operation end time to the time T ₁ as in the second view is the reserved set to be T _3, to palliative until the operation start time T _2. Proceeds to a washing step at time T _2, and ends rinsing process, at the time T ₃ Following the drying step. In the washing step, as shown in FIG. 3, after water is supplied to a predetermined water level by a water supply valve 16, the washing pump 3 is operated for one minute to perform pre-washing. After that, drainage is performed by the drainage pump motor 17 and water is further supplied. Then, the main cleaning is performed by operating the cleaning pump 3 while heating the water with the heater 7. The time of this main washing is determined as follows.

At the time of the reservation setting (time T ₁ ), dirty dishes are set in the washing tank, but the dirt sticks more strongly while waiting until the operation start time T ₂ . It is in the starch room for rice grains and the like that the sticking to tableware becomes particularly strong as time passes. If the time from soiling the dishes to washing is less than a predetermined time (1 hour), a sufficient cleaning performance can be obtained by the normal sequence for the main cleaning time. Extend time. There Te, the time T ₁ of the case of performing the reservation setting, when the difference between the operation start time T _2, exceeds a predetermined time, the main washing time of the washing step was extended to 20 minutes to 30 minutes, 30 minutes When the temperature has passed and the temperature detecting means 5 detects 57 ° C., the main washing is completed and drainage is performed. If the time does not exceed the predetermined time, the main washing is completed and drainage is performed when 20 minutes have elapsed and the temperature detecting means 5 detects 57 ° C.

As described above, according to the dishwasher of the embodiment of the present invention, when the difference between the time when the reservation setting is made and the operation start time exceeds a predetermined time, the control means 25 extends the time of the washing step. Therefore, even if the apparatus is left for a long time until the actual operation starts after the reservation is set and the dirt sticks to the tableware, the cleaning performance can be ensured.

 Next, another embodiment of the present invention will be described.

First control means 25 in the figure the time T ₁ when performing reservation setting, approximately in proportion to the difference between the operation start time T _2, or stepwise in the main wash of the washing process so as to prolong the time T I have to. Other configurations are the same as those in the above embodiment.

The operation of the above configuration will be described with reference to FIGS. 4 to 6. When the reservation is set and the operation start time comes, the process proceeds to the cleaning step, and the temperature detection means 5 is used in the main cleaning shown in FIG.
Until 57 ° C. is detected and T minutes have elapsed.
The time T is a function of T ₂ -T _1, for example, is extended in proportion to T ₂ -T ₁ as represented by the 5 T = 20 + 3 as shown in FIG. (T ₂ -T ₁₎ minute. The sixth
As shown in the figure, if T ₂ −T ₁ is within 1 hour, T is 20
Minutes may be extended in stages, such as 40 minutes if more than 1 hour and less than 3 hours. By extending the time of the cleaning step in this way, the cleaning performance can be ensured according to the strength of dirt sticking.

According to the present invention, as is clear from the above embodiments, the control means for controlling each of the washing, rinsing and drying steps is configured such that the difference between the time at which the reservation is set and the operation start time is a predetermined value. If the time is exceeded, the cleaning process time is extended, so that it can be reliably washed even if it is left for a long time until the actual operation starts after setting the reservation even if the dirt sticks to the tableware strongly, Cleaning performance can be ensured.

Further, the control means determines the time when the reservation setting is performed,
Since the time of the cleaning step is extended substantially in proportion to the difference from the operation start time, the cleaning time can be controlled in accordance with the strength of dirt sticking, thereby ensuring cleaning performance. Further, the control means extends the time of the cleaning step in a stepwise manner in response to the increase in the difference between the time when the reservation setting is made and the operation start time. The cleaning performance can be secured by controlling the cleaning time.

[Brief description of the drawings]

FIG. 1 is a block diagram of a dishwasher according to one embodiment of the present invention,
FIG. 2 is a flowchart of the dishwasher, FIG. 3 is a flowchart of a washing process of the dishwasher, FIG. 4 is a flowchart of a dishwasher according to another embodiment of the present invention, and FIGS. FIG. 7 is a diagram showing a main washing time in a washing process of a dishwasher, FIG. 7 is a longitudinal sectional view of a general dishwasher,
FIG. 8 is a block diagram of a conventional dishwasher. 2 ... washing tank, 4 ... washing motor, 5 ... temperature detecting means, 6 ... water level detecting means, 7 ... heater, 8 ... load,
24 ... Reservation timer device, 25 ... Control means.

Claims (3)

(57) [Claims] 1. A water level detecting means for detecting a water level in a washing tank, a temperature detecting means for detecting a water temperature in the washing tank, and a load from a washing motor, a heater and the like by inputting signals from the two detecting means. Controlling and washing, rinsing, control means for controlling each step of drying, and a reservation timer device capable of setting the operation end time, the control means, the time when the reservation setting is made and the operation start time A dishwasher configured to extend the time of the washing process when the difference exceeds a predetermined time. 2. The dishwasher according to claim 1, wherein the control means extends the time of the washing step substantially in proportion to the difference between the time when the reservation is set and the operation start time. 3. The dishwasher according to claim 1, wherein the control means extends the time of the washing step by step in accordance with an increase in the difference between the time when the reservation setting is made and the operation start time.