JPH01268532A - Dish washing machine - Google Patents

Abstract

PURPOSE:To obtain a similar dry state in the completion of drying irrespective of the atmospheric temperature by providing a recess for receiving cleaning water or the like in a cleaning tank, a temperature sensing means in the vicinity of the recess and a control means for determining a drying process time on the basis of a change in the sensing temperature. CONSTITUTION:A thermistor cover 11 having a recess 12 for storing cleaning water or the like on the upper surface is provided on a cleaning tank wall 13 to project into the cleaning tank 1. Operations of a dish washing machine are divided into three processes, i.e. cleaning, rinsing and drying and a control means 24 controls respective loads 6, 25 so that the respective processes proceed sequentially from cleaning. While water drops remaining in dishes are spread over the whole surface thereof, however, water drops remain still particularly on the edge 18 and the rim 19 of the bottom of a dish 17. Water amount accumulated in the recess 12 on the thermistor cover 11 is set to the average amount remaining in the rim 19 of the bottle or the like of the dish 17. A drying sensing thermistor 14 judges that the remaining water in the recess 12 is dried up and terminates the drying process. Thus, a constant drying state is always made available even if the ambient temperature is changed by season or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dishwasher having a drying function, and more particularly to a drying end detection means.

Conventional technology The basic configuration of a typical dishwasher is shown in FIG.

In the figure, 1 is a washing tank that stores tableware 3 supported by a basket 2, 4 is a washing nozzle that sprays washing water stored below the washing tank 1 onto the tableware 3 via a pump 6, and 6 is Washing 4 with a heater for heating washing water and tableware 3
+! It is located at the bottom of 1. 7 is a thermistor provided on the bottom back surface of the cleaning tank 1 to detect the temperature inside the cleaning tank 1;
Reference numeral 8 denotes a drying blower for sucking air from outside the machine through an intake duct 9 and sending out steam generated in the cleaning tank 1 through an exhaust duct 10.

The basic operation is divided into three steps: washing, rinsing, and drying.
In the cleaning process, cleaning water is circulated while being heated to a constant temperature by a heater 6 and is jetted from a cleaning nozzle 4.
In the rinsing step, the same operation as the washing step is performed, and the detergent from the previous step is washed away with water. Next, in the drying process, the heater 6 is energized intermittently while the drying blower 8 sends out the steam generated in the cleaning tank 1.In the cleaning/rinsing process, the liquid temperature of the cleaning water or water is determined based on the temperature detected by the thermistor. In the drying process, the heater 6 is controlled to keep the temperature constant, and in the drying process, the heater 6 is controlled to prevent an excessive rise in temperature of the oil parts and tableware in the washing f11.

Problems to be Solved by the Invention In conventional dishwashers, the only control is to stop energizing the heater 6 when the drying temperature exceeds a predetermined temperature, and the drying process time can be set arbitrarily.

However, even if the drying process time is the same, the drying state of the tableware differs depending on the atmospheric temperature in which the dishwasher is placed, so it has been difficult to set the time.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a dishwasher that can obtain the same dry state at the end of drying regardless of the ambient temperature.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a recess for receiving washing water etc. in the washing tank, a temperature detection means near the recess, and a drying system based on changes in the detected temperature. It is equipped with a control means for determining the process time.

Effects According to the above configuration, since water is ejected from the cleaning nozzle in the rinsing process before the drying process, water accumulates in the recess provided in the cleaning tank at the start of the drying process. The amount of residual water that accumulates in this recess is the standard amount of water droplets that remain at the bottom of a teacup, teacup, etc., and if the point at which this residual water evaporates is the end of drying, then ordinary tableware is in a dry state. Furthermore, the drying state remains constant regardless of the ambient temperature in which the dishwasher is placed. Note that the dry state of the remaining water in the recess is determined by examining a 1M degree change detected by a temperature detecting means provided nearby.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 to 6. In addition, since the basic structure of the dishwasher is the same as that of the conventional example, the same members are denoted by the same reference numerals.

In the figure, 11 is a thermistor cover provided on the cleaning tank wall 13 so as to protrude into the cleaning tank 1 and has a recess 12 on the upper surface for storing cleaning water, etc., and 14 is the thermistor cover 1
Dryness detection thermistor included in 1 (temperature detection means)
The thermistor cover 11 is fixed with a nut 16 via a packing 15. Reference numeral 24 denotes a control means for inputting the temperature of the thermistor 11 and controlling the cleaning bong motor 26 or the heater e.

As explained in the conventional example, the basic operation of a dishwasher is divided into three steps: washing, rinsing, and drying, and the control means 24 controls each load 6.25'jz so that each step sequentially proceeds from washing.
Control. The Susuki process is repeated several times, and the final Susuki process is called heating rinsing, in which water is heated to a certain temperature and jetted out from the washing nozzle 4 in order to remove residual oil and fat from the tableware and accelerate drying. After draining the water out of the machine, the drying blower 8 is operated and at the same time the heater 6 is energized intermittently to start the drying process.The water droplets remaining on the tableware are spread over the entire surface of the tableware, but especially on figure.

As shown in the fourth □□□, the rim 18 of the bowl 17 and the thread bottom 1
9. A large amount of water remains on the thread bottom 21 of the hot water cup 20, and drying of these remaining water is the final step.

In the above configuration, the amount of water accumulated in the four parts 12 of the thermistor cover 11 is equal to the thread 1 of the teacup 17 and teacup 20.
9 and 21, and the change in the detected temperature T of the dryness detection thermistor 14 is
It will look like the figure. T in the heating susuza process. After K is reached and the drying process is started, the water accumulated in the four parts 12 begins to evaporate, and as a result, heat is taken away as heat of vaporization, and as a result, the detected temperature decreases and becomes balanced with the amount of heat received from the heater 6. Evaporation progresses with temperature. Then, when the residual water dries, the detected temperature begins to rise suddenly because the amount of heat taken away as heat of vaporization is lost. Therefore, the control means 24, which periodically deposits this detected temperature T, determines that the residual water in the recess 12 has dried when the change T/Δt has increased by more than a certain amount, and starts the drying process. finish.

In this embodiment, the thermistor cover 11 has a recess 12.
However, the configuration can be made simpler by providing the entire recess 22 at the bottom of the cleaning tank 1 and attaching the thermistor 23 directly below the recess 22, as shown in FIG.

As is clear from the VA175A, the drying process time is automatically adjusted even if the ambient temperature changes depending on the season, etc., so a constant drying state can always be achieved, making it easier to use. This is extremely convenient since it does not require the person to separately set the drying time.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a dishwasher showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the same essential parts, Figs. 3 and 4 are partially cutaway side views of the tableware, and Fig. 6 is a detection FIG. 6 is a partially cutaway perspective view showing the vicinity of a thermistor according to another embodiment of the present invention, and FIG. 7 is a sectional view showing a conventional dishwasher. 1...Cleaning tank, 6...Heater, 11.
...Thermistor cover, 12 ... Concavity, 1
4...Thermistor for dryness detection, 24...
- Control means. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure (-encounter t1

Claims (1)

[Claims] A washing tank for storing dishes, etc., a heating means for warming the dishes, washing water, etc. in the washing tank, a recess provided in the washing tank for receiving the washing water, etc., and a temperature detection means near the recess, A dishwasher comprising a control means for controlling the heating means, wherein the control means determines a drying process time based on an amount of change in temperature detected by the temperature detection means.