JPH03272726A - Dish washer - Google Patents

Abstract

PURPOSE:To sufficiently dry dishes, and thereby prevent the occurrence of getting the dishes wet due to dew condensation by ventilating air within a washing tank at the time of drying with remaining heat, in a dish washer where the dishes are rinsed with hot water and thereafter dried with remaining heat. CONSTITUTION:The third rinsing is similarly done after the first and the second rinsing have been done. Rinsing with hot water is then performed. During hot water rinsing, washing with jetted water is performed as usual while water is supplied and discharged before and after washing. At the time of washing with jetted water, however, water within a washing tank 2 is heated up with a heater 13 energized, so that hot water is thereby jetted. After that, if a drying process is selected, it is possible that air within the washing tank 2 is heated up with the heater 13 energized so as to be heated, and drying is performed in such a way that outside air is drawn in the washing tank 2 with a fan driving motor 19 energized so as to be driven.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Application Field) The present invention relates to a dishwasher capable of rinsing dishes with hot water.

(Prior Art) Conventionally, dishwashers have been provided that perform rinsing with hot water at the end of a washing course. In this case, if the washed dishes are not needed within a short time of 1 to 2 hours, for the purpose of saving electricity, avoid running the drying operation in which the dishes are dried using the heat of the heater, as described above. The residual heat from rinsing with boiling water may cause it to dry naturally.

(Problem to be Solved by the Invention) However, when drying dishes using residual heat from rinsing with boiling water as described above, moisture may accumulate in the washing tank and sufficient drying may not be possible. When the outside temperature drops significantly, such as during winter, condensation may form on the surface of dishes left in the washing tank even after they have dried, or condensation may form on the inner walls of the washing tank. However, there is a problem in that the dew falls onto the surface of the tableware, causing the tableware to become wet.

The present invention has been made in view of the above-mentioned circumstances, and its object is to sufficiently dry tableware when drying the tableware using residual heat from rinsing with boiling water, and to prevent the tableware from getting wet due to condensation. Our goal is to provide you with an excellent dishwasher that won't cause any problems.

[Structure of the Invention] (Means for Solving the Problems) The dishwasher of the present invention is capable of rinsing dishes with hot water in a washing tank, and then drying the dishes with residual heat. The washing tank is characterized in that it is equipped with a ventilation means for ventilating the inside of the washing tank during the residual heat drying.

In this case, the ventilation means includes a blower that takes in or exhausts air into the cleaning tank, an inside temperature detection means that detects the temperature inside the cleaning tank, an outside temperature detection means that detects the temperature outside the machine,
It is also conceivable to include a control means for controlling the operation of the blower according to the temperature detection result by these temperature detection means.

Further, the ventilation means may be a member or a mechanism that maintains a door for opening and closing the tableware entrance/exit of the washing tank in a half-open state.

(Function) When drying dishes using the residual heat from rinsing with boiling water, if the washing tank is ventilated, the moisture in the washing tank will be radiated outside the machine and will not remain trapped inside the washing tank. Furthermore, the temperature difference between the inside of the cleaning tank and the outside of the machine is reduced, and the occurrence of dew condensation is suppressed.

Therefore, the ventilation inside the cleaning tank can be achieved by using a blower to draw air into the cleaning tank or exhaust air from the inside of the cleaning tank. If the control is performed accordingly, more reliable effects can be obtained, especially in terms of suppressing dew condensation.

Ventilation within the cleaning tank can also be achieved by keeping the door partially open. In this case, ventilation is natural ventilation, which requires only a simple configuration, and requires less space than if the door is left fully open.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

First, the first embodiment shown in FIGS. 1 to 5 will be explained. In FIG. 2, an outer box 1 of the dishwasher shown as a whole has a washing tank 2 disposed therein. A door 4 for opening and closing a tableware entrance/exit 3 on the front of the washing tank 2 is pivotally installed in the front part. In the washing tank 2, dish baskets 6 and 7 for storing dishes 5 are arranged in the upper and lower parts of the interior so as to be able to be taken in and out, respectively, and a pump 8 and a supply water from the pump 8 are provided in the bottom part. Fountain arms 9 and 10 are provided to receive the water and spray it onto the tableware 5 storage portion of the tableware basket 6.7. In addition, pump 8
The pump 8 is also used for water drainage, and a motor 11 disposed outside the cleaning tank 2 rotates the pump 8 in the normal direction through a belt transmission mechanism 12 during washing and reversely during draining. In addition, a heater unit 3 is installed on the outer surface of the bottom of the cleaning tank 2, and a drain hose 1 is installed outside the cleaning tank 2.
4, and a water level detection device 15 for detecting the water level stored in the cleaning tank 2.

On the other hand, at the rear of the cleaning tank 2, a water supply valve 16 and a water supply hose 17 leading from the water supply valve 16 to the cleaning tank 2 are arranged, and a blower 20 consisting of a fan 18 and a motor 19 is installed inside. A casing 21 and an air supply hose 22 leading from the casing 21 to the cleaning tank 2 are provided, and as shown in FIG. A first temperature sensor 23 as a means is provided. On the other hand, a second temperature sensor 24 is disposed at the rear of the outer box 1 as an outside temperature detection means for detecting the temperature outside the machine.

An operation panel 25 is disposed at the front of the outer box 1 below the door 4, and a control device 26 serving as a control means is disposed inside the operation panel 25.

This control device 26 is, in detail, composed of a microcomputer, and as shown in FIG. Temperature detection signals are manually inputted from the two temperature sensors 24, and
A door opening/closing signal is input from a door switch 27 provided to respond to the opening/closing of the water supply valve 16. Based on these inputs and a control program stored in advance, the water supply valve 16. Pump drive motor 11. The energization signals are applied to a drive circuit 28 for energizing the fan drive motor 19 and the heater 13, respectively.

Therefore, the overall operation based on the operation of the control device 26 will be described below with reference to FIGS. 5 and 1.

I will explain while referring to it.

Figure 5 shows the most standard driving course (standard course), that is, in this course, first
Specifically, this "washing" involves supplying water into the cleaning tank 2 by opening the water supply valve 16, and then starting the pump drive motor 11 by energizing it. Fountain washing is carried out in the washing tank 2, and then water is drained from the washing tank 2 by energizing and starting the pump drive motor 11. Next, the "first rinse" is performed, and even in this "first rinse", the "washing"
Similar water supply, fountain washing and drainage are carried out. Then, the "second rinse" and the "third rinse" after that.
A "second rinse" is performed in the same manner, followed by a "boiling water rinse."

In this "boiling water rinse", water is supplied in the same way as in "washing".

During fountain washing and draining, the heater 13 is energized to generate heat to turn the water in the washing tank 2 into boiling water, and this boiling water is sprayed.After this, "drying" is performed. If selected, heater 1
heating the air in the cleaning tank 2 by energizing 3 and generating heat;
This "drying" is performed by energizing and starting the fan drive motor 19 and drawing air from outside the machine into the cleaning tank 2.

On the other hand, if you have not selected to perform "drying" after "boiling water rinsing", then tableware 5 is
"Residual heat drying" will be carried out to dry naturally using the residual heat of. During this "residual heat drying", as shown in FIG. 1, the control device 26 first looks at the temperature detection result outside the machine obtained from the second temperature sensor 24,
It is determined whether or not the temperature is lower (step Sl). Here, if it is determined that the temperature outside the machine is not lower than 15 degrees Celsius, then the operation is terminated with the fan drive motor 19 kept powered off (step S2), but if it is determined that the temperature is low, Next, based on the temperature outside the machine and the temperature detection result inside the cleaning tank 2 obtained from the first temperature sensor 23, it is determined whether the temperature inside the cleaning tank 2 is higher than the temperature outside the machine ( Step S3).

Here again, if it is determined that the temperature inside the cleaning tank 2 is not higher than the temperature outside the machine, the operation is terminated through step S2 as described above, but if it is determined that the temperature is higher than the temperature outside the machine, then the cleaning tank 2
It is determined whether the temperature inside the machine is equal to the temperature outside the machine plus 2°C (step S4). Further, if it is determined that the temperature inside the cleaning tank 2 is the temperature outside the machine plus 2℃, the operation is also terminated through step S2, but it is not the value plus 2℃. If it is determined that the fan drive motor 19 is energized, the fan 18 is rotated, and air from outside the machine is sucked into the cleaning tank 2 (step S5).
). As a result, the humid air inside the cleaning tank 2 is discharged to the outside of the machine in an amount commensurate with the amount of intake air, and the inside of the cleaning tank 2 is ventilated. Note that after this, the process returns to step S1 and repeats the same process as described above.

In this way, according to the above structure, the drying of the tableware 5 is performed as follows.
When performing a hot water rinse using the residual heat, air from outside the machine can be sucked into the cleaning tank 2 for ventilation, which allows moisture inside the cleaning tank 2 to be radiated outside the machine and The tableware 5 can be sufficiently dried because it does not remain trapped. Furthermore, since the temperature difference between the inside of the washing tank 2 and the outside of the machine is reduced, the occurrence of dew condensation is suppressed, and the problem of the tableware 5 getting wet due to the dew condensation can be prevented.

In addition, in this case, the operation control of the blower 21 is controlled by the cleaning tank 2.
Since this can be done depending on the temperature inside the machine as well as the temperature outside the machine, a more reliable effect can be obtained, especially in terms of suppressing dew condensation.

Note that the ventilation inside the cleaning tank 2 by the blower 21 is not done by sucking air outside the machine into the cleaning tank 2 as described above, but on the contrary, it is done by drawing the air inside the cleaning tank 2 outside the machine. This may also be done by discharging it.

Next, the second embodiment shown in FIGS. 6 to 9 will be explained.
The same parts as in FIG.
A holding piece 32 is pivotably mounted on one side of the free end side opposite to the hinge shaft 31 portion having a hinge lever 30 biased by a spring 29, and is movable up and down by a shaft 33. 32 is formed with a convex stepped portion 34 positioned directly below it and locking the portion 32 in a horizontal state.

In this case, when drying the tableware 5 using the residual heat from "boiling water rinsing", the holding piece 32 is rotated from the vertical position shown by the solid line in FIG. 7 to the horizontal position shown by the two-dot chain line. 34. Then, as shown in Figure 8,
The tip of this holding piece 32 hits the area around the tableware entrance 3 of the outer box 1, resists the biasing force of the spring 29, and presses the door 4.
will now be held in a half-open state. When this happens,
The exhaust of humid air from inside the cleaning tank 2 and the intake of air outside the machine into the cleaning tank 2 occur naturally through the space between the door 4 and the outer box 1. In short, natural ventilation takes place within the room. Therefore, even with this method, the tableware 5 can be sufficiently dried and the problem of the tableware 5 getting wet due to dew condensation can be prevented.
It suffices to have a simple structure in which the holding piece 32 is pivotally attached to the door 4, and since the door 4 is left in a half-open state,
Compared to the fully open state, the amount of forward protrusion can be kept to a minimum, reducing the amount of space required.

Figure 9 shows the results of an experiment conducted by the inventor at night at a temperature of 10[C] to show the change in dryness over time. Even after 12 hours, the dryness of the tableware 5 reached only a little over 20C%], whereas when the door 4 was kept partially open and the tableware 5 was dried with residual heat, the dryness of the tableware 5 reached only 20C% after 12 hours. Approximately 5
It reached 0%, and after 8 hours it reached about 90%, and 1
After two hours, it reached nearly 100 [%].
It can be seen that the tableware 5 was sufficiently dried.

Note that, in order to hold the door 4 in the half-open state, in addition to using the above-mentioned holding piece 32, for example, the hinge shaft 31 portion of the door 4 may be configured as a mechanism that holds the door 4 in the half-open state using frictional force or the like. Also good.

[Effects of the Invention] The dishwasher of the present invention is as described above, and has the following effects.

When dishes are dried using the residual heat from rinsing with boiling water in the washing tank, by providing a ventilation means to ventilate the washing tank, the dishes can be dried sufficiently and the dishes can be prevented from getting wet due to condensation. Problems can be avoided.

In addition, the ventilation means includes a blower that takes in or exhausts air into the cleaning tank, an inside temperature detection means that detects the temperature inside the cleaning tank, an outside temperature detection means that detects the temperature outside the machine, and these. By providing the control means for controlling the operation of the blower according to the temperature detection result by the temperature detection means, it is possible to obtain a more reliable effect in suppressing dew condensation.

Furthermore, by providing the above-mentioned ventilation means with a member or mechanism that holds the door for opening and closing the tableware entrance/exit of the washing tank in a half-open state, a simple configuration can be kept, and the door can be kept in a fully open state. The required space can be reduced.

[Brief explanation of drawings]

1 to 5 show a first embodiment of the present invention, in which FIG. 1 is a flowchart showing the action during residual heat drying, FIG. 2 is a longitudinal cross-sectional side view of the entire dishwasher, and FIG. The figure is a rear view of the entire machine with the back plate removed, Figure 4 is a schematic electrical configuration diagram, and Figure 5 is a standard course process diagram. 6 to 9 show a second embodiment of the present invention. FIG. 6 is a perspective view of the entire dishwasher, FIG. 7 is an enlarged perspective view of the main parts, and FIG. 8 is a perspective view of the main parts. FIG. 9, which is a side view of the entire dishwasher during residual heat drying, is a diagram showing the changes in dryness over time based on the inventor's experimental results. In the drawing, 2 is a washing tank, 3 is a tableware entrance, 4 is a door, 5 is a tableware, 20 is a blower, 23 is a first temperature sensor (temperature detection means inside the tank), and 24 is a second temperature sensor (outside the machine). 26 is a control device (control means), and 32 is a holding piece (a member that holds the door in a half-open state).

Claims (1)

[Claims] 1. Dishes are rinsed with boiling water in a washing tank, and then the dishes are dried using residual heat, and when drying with residual heat, ventilation is provided in the washing tank. A dishwasher characterized by being equipped with a ventilation means. 2. The ventilation means includes a blower that takes in or exhausts air into the cleaning tank, and tank temperature detection means that detects the temperature inside the cleaning tank.
The dishwasher according to claim 1, comprising external temperature detection means for detecting the temperature outside the machine, and control means for controlling the operation of the blower according to the temperature detection results by these temperature detection means. . 3. The dishwasher according to claim 1, wherein the ventilation means is a member or mechanism that maintains a door for opening and closing the dish entrance of the washing tank in a half-open state.