JPH10127559A - Dishwasher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent burn suffered in taking out dishes, by making a washing water circulation passage constituted outside a dish storage tub into a pipe shape made of a metal and equipping a heat transferring body to surround the pipe and heating the heat transferring body by a heater. SOLUTION: A water supply pump 8 is placed under a storage tub 3 of this dish washer 1 and pressurized water from the water supply pump 8 is jetted to the whole area in the dish storage tub 3. A water pool 21 is place on the bottom part of the dish storage tub 3. A washing water circulation duct 24 is connected the water pool 21. A heater pipe 13 is connected to the other end of the duct 24 and a washing water circulation duct 19 connects between the heater pipe 13 and the water supply pump 8. A heat transferring body 23 to be in contact integrally with the heater is equipped around the heater pipe 13. On washing, the heater is energized to supply heat of the heated heat transferring body 23 to water to heat water. During a drying process, the heater is turned on and off for prescribed times to change cool wind to warm wind and dishes are dried by the warm wind.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a dishwasher.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a heater mounting portion of a dishwasher has a curved heater mounting portion 3b in a tableware storage tank 3, in which a heater 12 is mounted. A silicone filler is applied between the portions 3b in order to enhance heat conductivity and adhesion. Further, as another configuration, there is a configuration in which a heater 12 is attached to a bottom surface inside the tableware storage tank.

[0003]

According to the heater having the above structure, since the tableware storage tank is in contact with the heater, the heat of the heater is transmitted to the tableware storage tank, and the tank is heated. When opening the door and taking out the dishes, there was a problem that there was a risk of burns. The same applies to the case where the heater is inside the tableware storage tank, and there is a possibility that the heater may directly touch the heater. In the former case, the tableware storage tank needs to be made of metal such as stainless steel in order to improve the heat transfer, and there is a problem in that it is expensive in terms of cost. It was large and inefficient in terms of performance.

[0004] If the latter tableware storage tank has a heater,
Further, when the inside of the tank is cleaned after use, there is a problem that the heater is in the way and cannot be cleaned.

[0005] It is an object of the present invention to provide a dishwasher that prevents burns when taking out tableware and improves the thermal efficiency of a heater.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a washing water circulation path formed outside a tableware storage tank is formed in a metal pipe shape, and a heat transfer member covering the periphery of the pipe is provided. And a heater for heating the heat transfer body was integrally brought into contact with the heat transfer body.

Further, in order to reduce the thermal loss between the metal pipe and the heat transfer body, a filler having a good heat transfer coefficient is applied to these contact surfaces, or the metal pipe and the heat transfer body are integrally formed. Things.

[0008] According to the above structure, since the heater is provided outside the tableware storage tank and the heat is used to heat the washing water, the tableware storage tank does not become hot due to the heater and may be burned. There is no. Further, the tableware storage tank only needs to withstand the temperature of the heated washing water, a resin-made tank is sufficient, and the tableware storage tank can be an inexpensive tableware storage tank. Since there is no such thing, there is nothing in the way when cleaning the inside of the tank, and it can be cleaned neatly. Further, since the tableware storage tank can be made of resin, the heat of the heated washing water is less likely to be radiated than the metal tableware storage tank, and the thermal efficiency is good.

[0009]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS.

FIG. 1 is a perspective view showing the overall appearance of a dishwasher according to the present invention, FIG. 2 is a longitudinal sectional side view shown in FIG. 1, FIG. 3 is a configuration diagram of a conventional heater installation, and FIG. 5 to 7 are detailed views showing alternatives of the heater unit of the present invention.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a dishwasher, and the dishwasher 1 has a box-shaped outer frame 2. A tableware storage tank 3 is arranged in the outer frame 2, and a door 4 is provided at an opening on the front surface thereof. At the lower part of the side wall of the tableware storage tank 3, a step portion 3a is provided, and the tableware lower basket 5 is detachably disposed on the step portion 3a.

A front and rear movable rail 6 is attached to the upper part of the side wall of the tableware storage tank 3. By inserting the tableware upper basket 7 into the rail 6, the tableware storage upper basket 7 can be freely taken in and out. can do.

A water supply pump 8 is arranged below the tableware storage tank 3, and the water supply pump 8 has a pump motor 9. Immediately below the tableware storage basket 5, a lower arm nozzle 10 that rotates around a central portion as a fulcrum is arranged, and a plurality of small holes 10 are provided on the upper surface of the lower arm nozzle 10.
a is provided. The washing water supplied by the water supply pump 8 is supplied to the lower basket 5 for storing tableware.
Is disposed. An upper arm nozzle 11 that rotates about a central portion thereof is disposed directly below the tableware storage basket 7, and a plurality of small holes 11 are provided on the upper surface of the upper arm nozzle 11.
a is provided.

An exhaust duct 15 is provided above the tableware storage tank 3.
Are arranged, and the exhaust duct 15 is connected to the exhaust port 16. Above the door 4, the control panel 1
7 is disposed, and a water supply solenoid valve 14 is provided on the back of the tableware storage tank 3.
Is arranged.

A drain pump 18 shown in FIG. 2 is disposed below the tableware storage tank 3 in addition to the water supply pump 8.

A washing water circulation duct 19 is connected to the water reservoir 21 arranged at the bottom of the tableware storage tank, and a heater pipe 13 is connected to the other of the washing water circulation duct 24 and a washing water circulation duct from the heater pipe 13. 19 is connected to the water supply pump 8. Around the heater pipe 13, the heat transfer body 2 that is integrally contacted with the heater 12 is provided.
3 are provided.

The operation of washing, rinsing with water, rinsing with warm water and drying of the dishwasher 1 having the above configuration will now be described.

First, in the washing operation, the water supply solenoid valve 14 is energized, washing water is supplied to the tableware storage tank 3, and the heater 12 is energized to energize the pump motor 9 to rotate the cleaning runner 20. Then, water is sucked in from the water reservoir 21 disposed at the bottom of the tableware storage tank 3 and the washing water circulation duct 2
4, the heat of the heat transfer body 23 heated by the heater in the heater pipe 13 is supplied to the water, and the water is heated.
Wash water circulation duct 19, water supply pump 8, pump outlet 2
Inside the lower arm nozzle 10 and the bench ely tube 1
A pressure is supplied to the upper arm nozzle 11 from the bench Erie pipe 11b. And the lower arm nozzle 1
The pressure water is directly sprayed from the small hole 10a of the upper arm nozzle 11 into the tableware in the lower basket 5 for storing tableware.
By directly injecting pressurized water into the tableware in the tableware storage basket 7, dirt attached to the tableware is separated and dispersed. At this time, the pressurized water from the lower arm nozzle 10 and the upper arm nozzle 11 is sprayed over the entire area in the tableware storage tank 3. After washing for a certain time,
The energization of the pump motor 9 and the heater 12 is stopped to terminate the washing operation, and the drainage pump 18 is energized to discharge the washing water in the tableware storage tank 3 out of the machine.

Next, the rinsing operation is performed by repeating the same operation as the cleaning operation several times. At this time, the heater 1
The power supply to 2 is performed only in the warm water rinsing operation, and is not performed in other rinsing operations.

Finally, in the drying operation, a blower unit (not shown) is energized to rotate a blower fan, and the dishes are passed through a blower duct, a heater 12 and a blower passage 25 arranged below the tableware storage tank 3. The air is blown into the storage tank 3.

At this time, the heater 12 is turned on and off for a certain period of time to change the cold air into the hot air, and this hot air causes water droplets and residual water adhering in the tableware storage tank 3 to remain. In addition, water drops attached to the tableware stored in the tableware storage lower basket 5 and the tableware storage upper basket 7 are converted into steam,
The air is exhausted outside the machine via the exhaust duct 15 and the exhaust port 16.

When the drying operation has been performed for a certain period of time, the operation of the dishwasher 1 ends.

Next, details of the heater section of the present invention will be described with reference to FIG. The heater 12 is inserted in an L-shape into a heat transfer body 23 made of aluminum die-cast, and the heater pipe 13 is in contact with a semicircular groove in the heat transfer body 23. Fixed. The heat from the heater is transmitted to the heat transfer body 23 and supplied to the circulating water through the heater pipe 13. However, if there is an air layer on the contact surface between the heat transfer body 23 and the heater pipe 13, the heat transfer becomes poor, The heating performance of the circulating water deteriorates. Therefore, as an alternative to FIG. 4, as shown in FIG. 5, a heat transfer coefficient is good on the contact surface (heat transfer rate X = 1 w / mk), and a silicon-based filler is applied so as not to form an air layer. You can also. Further, FIG. 6 shows another alternative in which the heat transfer body 23 and the heater pipe fixing plate 26 having the above structure are integrally formed, and the heat transfer performance is further improved by insert molding the heater pipe 13 by aluminum die casting or the like. is there. in addition,
By further reducing the number of parts, the heater pipe 13 and the heat transfer body 2
FIG. 7 shows an example in which 3 is integrally formed.

In addition to the embodiment shown in FIGS.
Any other material may be used as long as the heating performance of the circulating water, such as the material of the heat transfer member, is satisfied, and the effect of the present invention is not affected at all.

[0025]

According to the present invention, there is a heater outside the tableware storage tank, and the heat of the heater is used to heat the washing water. It is possible to provide a highly safe dishwasher that is not likely to be damaged.

Further, the tableware storage tank only needs to withstand the temperature of the heated washing water, and a resin-made tank is sufficient, so that an inexpensive tableware storage tank can be obtained. Furthermore, since the heater is not inside the tableware storage tank, there is nothing obstructive when cleaning the inside of the tank, and it can be cleaned neatly. .

Further, by applying a filler having a high thermal conductivity between the heater pipe and the heat transfer member, the thermal efficiency for producing hot water can be increased.

Further, if the heater pipe is insert-molded with the heat transfer body, it is not necessary to apply a filler and a heater pipe fixing plate is not required, so that the number of parts can be reduced and the cost can be reduced. Furthermore, if the heater pipe and the heat transfer element are integrated, the structure of the heater can be further simplified, the cost can be reduced, and the heat loss can be reduced. Machine can be provided.

[Brief description of the drawings]

FIG. 1 is an external view of a dishwasher according to the present invention.

FIG. 2 is a vertical sectional side view of the dishwasher according to the present invention.

FIG. 3 is a vertical sectional side view of a conventional dishwasher.

FIG. 4 is a detailed view of a heater section according to the present invention.

FIG. 5 is a diagram showing another example of the heater section according to the present invention.

FIG. 6 is a view showing another example of the heater section according to the present invention.

FIG. 7 is a view showing another example of the heater section according to the present invention.

[Explanation of symbols]

12 ... heater, 13 ... heater pipe, 19 ... washing water circulation duct, 23 ... heat transfer body.

Continuing from the front page (72) Inventor Shoji Kawai 1-1-1 Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Taga Headquarters, Hitachi, Ltd.

Claims (4)

[Claims] 1. A tableware storage tank, a tableware storage tank is covered from the outside, a body constituting an outer shell, a cleaning pump as cleaning water supply means for cleaning the tableware, a heater for changing the cleaning water to hot water, and a cleaning water. A dishwasher having a drain pump that discharges outside the machine, wherein a heater is provided in a washing water circulation path from the dish storage tank to the washing pump and from the washing pump to the dish storage tank. 2. The heater according to claim 1, wherein a washing water circulation path of the heater is formed in a pipe shape, the heater has a heat transfer body covering the circumference of the pipe, and a heater for heating the heat transfer body is integrally brought into contact with the heat transfer body. Dishwasher characterized by having been made. 3. The dishwasher according to claim 2, wherein the pipe shape is formed integrally with the heat transfer body. 4. The dishwasher according to claim 2, wherein a filler having a heat transfer coefficient of 1 w / mk or more is provided on a contact surface between the pipe and the heat transfer body.