JP2606874Y2 - Dishwasher heater - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater for a dishwasher.

[0002]

2. Description of the Related Art As one of heater devices used in a dishwasher, an electric heater for increasing the temperature in a refrigerator and a heater for detecting the temperature and supplying the electric heater to the electric heater so that the temperature is maintained at a set value. Some include temperature detecting means (thermostat) for outputting a signal for controlling the energization, and a temperature fuse for detecting overheating of the electric heater and interrupting energization to the electric heater. No. in the official gazette.

[0003]

In the heater device disclosed in the above-mentioned publication, an electric heater is mounted on the bottom of the cleaning tank using a support metal, and a thermostat and a temperature fuse are mounted on the cleaning tank using a holding metal. It is attached to the bottom lower surface. For this reason, the thermostat and the thermal fuse do not directly sense the temperature of the electric heater, but react with the water or air in the cleaning tank heated by the electric heater through the bottom wall of the cleaning tank, or the support bracket and the cleaning tank. Alternatively, the reaction occurs through the support bracket, the cleaning tank, and the holding bracket, and a large temperature difference occurs between the electric heater, the thermostat, and the temperature fuse, so that not only the overheating of the electric heater cannot be accurately detected, but also the electric heater is heated. The temperature of water or air in the cleaning tank cannot be controlled accurately. SUMMARY OF THE INVENTION The present invention has been made to address the above-described problem, and has as its object to provide a heater device for a dishwasher capable of accurately detecting overheating of an electric heater and accurately controlling the temperature in a refrigerator heated by the electric heater. Is to provide.

[0004]

In order to achieve the above object, in the present invention, outside air is introduced into the refrigerator.
A duct is arranged along the outside of the peripheral wall forming the storage body,
An electric heater for heating the introduced air is installed in the middle of the duct.
In only be made dishwasher, come into contact with the electric heater
Adjustable temperature plate on the inner wall of the duct
Attach a temperature hue to detect overheating of the electric heater.
An overheat detecting element such as a fuse is attached to the outer peripheral surface of the electric heater.
Or the part where the temperature sensing plate contacts the electric heater.
To the outer surface of the thermo-sensing plate while passing through the electric heater.
Temperature detection such as a thermostat that outputs a signal to control electricity
An output element on the outer surface of the temperature sensing plate downstream of the electric heater.
Mounted and configured .

[0005]

In the heater device of the dishwasher according to the present invention, the temperature of the electric heater is transmitted to the temperature fuse directly or via the temperature-sensitive plate and to the temperature detecting means via the temperature-sensitive plate. Therefore, the thermal fuse accurately detects overheating of the electric heater and appropriately shuts off the power supply to the electric heater, thereby properly protecting the electric heater. The temperature detecting means, the refrigerator, which is warmed by the electric heater the temperature of the electric heater via the temperature-sensitive plate to sense large temperature differences without
Control the internal temperature with high precision. In addition, the temperature plate
Because of the position adjustment, there is a manufacturing error of each member.
The temperature sensitive plate to the electric heater and temperature detecting means
And be Rukoto, target the temperature of the temperature heater to the temperature detection hand stage
Not only can it be transmitted reliably,
Make sure that unnecessary force does not act on the heater and temperature detection means.
Can be

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a dishwasher 10 having a heater device according to the present invention.
Represents three injection nozzles 12a, 12b, and 12c in the chamber 11.
The duct 13 is provided in an L shape along the upper part and the back part of the storage 11. Duct 13
Has an intake port 13a opened in the upper front part of the dishwasher 10, and an exhaust port 13b opened in the lower rear part of the refrigerator 11, and has a blower fan 14 and an electric heater 15 inside.
Is provided. In addition, a filter 13c is provided in the intake port 13a of the duct 13 to remove dust and the like outside the refrigerator, thereby preventing dust and the like from adhering to the blower fan 14 and the electric heater 15.

The blower fan 14 is driven by an electric motor (not shown) during the dish drying process. The blower fan 14 sucks outside air and blows air toward the electric heater 15 as shown by a white arrow in the drawing. It is supposed to. The air blown to the electric heater 15 is heated by the electric heater 15 and sent into the storage 11 through the exhaust port 13b.
After the tableware 16 is dried in the inside, the tableware 16 is released into the atmosphere from a gap between the storage 11 and the door 17 or the like. As shown in FIG. 3, the electric heater 15 is a well-known structure constituted by combining thin heating plates.
3 is assembled together with a temperature fuse 21, a thermostat (bimetal-type thermo) 22, a temperature-sensitive plate 23, and the like to a heater box (made of a heat insulating material) 13d which constitutes a part of the air conditioner 3. The heater device is constituted by the temperature fuse 21, the thermostat 22, the temperature sensing plate 23 and the like.

[0008] The thermal fuse 21 is a known fuse which detects overheating of the electric heater 15 and cuts off the power supply to the electric heater 15, and as shown in detail in FIG.
It is directly attached to the side surface of the electric heater 15 using heat conductive silicon 24 for transmitting heat well, and is held from the outside by a holding plate 25. The thermostat 22 is connected to the electric heater 15 transmitted through the temperature sensitive plate 23.
Its temperature is known per se temperature detecting means for outputting a signal for controlling the energization of the electric heater 15 to be maintained at the set value, the heater box located below the electric heater 15 to detect the temperature Attached to 13d ,
As shown, the inner end is exposed inside the duct 13. The temperature sensing plate 23 is an aluminum plate piece having the shape shown in FIG. 2 and FIG.
Is screwed so that the vertical position can be adjusted, contacts the thermostat 22 via the heat conductive silicon 27 at the intermediate portion, and contacts the lower surface of the electric heater 15 at the tip portion. Is transmitted to the thermostat 22.

In this embodiment constructed as described above, the temperature of the electric heater 15 is directly transmitted to the thermal fuse 21 and transmitted to the thermostat 22 through the temperature sensitive plate 23 in the duct 13 . Therefore, the thermal fuse 21 accurately detects overheating of the electric heater 15 and appropriately cuts off the power supply to the electric heater 15 to appropriately protect the electric heater 15. The temperature sensing plate 23 is made of an aluminum plate piece.
Therefore, the heat capacity of the temperature sensing plate 23 can be reduced.
The temperature of the electric heater 15 to the thermostat 22 quickly.
It can be transmitted quickly and accurately. Therefore, the thermostat 22 is connected to the electric heater 15 via the temperature sensitive plate 23.
And the temperature of the air heated by the electric heater 15 is accurately controlled.

In this embodiment, the temperature sensing plate 23 is mounted on the heater box 13d so that the vertical position can be adjusted.
Since the intermediate portion abuts against the thermostat 22 and the distal end portion abuts against the lower surface of the electric heater 15, even if there is a manufacturing error of each member, the temperature-sensitive plate 23 accurately contacts the electric heater 15 and the thermostat 22. The temperature of the electric heater 15 can be accurately transmitted to the thermostat 22, and the temperature-sensitive plate 23 can be screwed to the thermostat 22.
Can be provided as a fulcrum, and malfunction due to excessive pressing of the thermostat 22 can be prevented.

FIGS. 5 and 6 show another embodiment of the present invention. In this embodiment, a tin-plated copper plate piece is used as the temperature-sensitive plate 23, In addition to preventing the copper plate from being corroded by the water droplets 31 and the moisture 32, better heat conduction in terms of material than the aluminum plate piece of the above embodiment can be obtained. Further, in the present embodiment, the upper part of the temperature sensing plate 23 is sandwiched between the electric heater 15 and the heater box 13d so that the temperature sensing plate 23 is forcibly brought into close contact with the side surface of the electric heater 15 face by face. The thermal fuse 21 is attached to one side of the temperature sensitive plate 23 by using heat conductive silicon 24. The other configuration is substantially the same as the above embodiment.

In the embodiment shown in FIGS. 5 and 6, the heat of the electric heater 15 is transmitted to the temperature sensitive plate 23 more efficiently than in the above embodiment. Is transmitted to the thermal fuse 21 and the thermostat 22 through the temperature-sensitive plate 23 to the same extent without a temperature difference, so that the thermal fuse 21 is not accidentally blown at a temperature within the operating range of the thermostat 22. Also, the temperature sensing plate 23
Is sandwiched between the electric heater 15 and the heater box 13d so that the temperature sensing plate 23 is supported at both ends. Thus, the temperature sensing plate 23 and the thermostat 22 are prevented from malfunctioning due to excessive pressing of the thermostat 22.
And the upper part of the temperature sensing plate 23 does not hinder the flow of air, and a large amount of heated air is stored in the storage 1.
1 can be efficiently guided.

[Brief description of the drawings]

FIG. 1 is a vertical side view showing an embodiment of a dishwasher having a heater device according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a perspective view of the electric heater shown in FIGS. 1 and 2;

FIG. 4 is a perspective view of the temperature sensing plate shown in FIGS. 1 and 2;

FIG. 5 is an enlarged sectional view of a main part showing another embodiment of the heater device according to the present invention.

6 is a perspective view of the temperature sensing plate shown in FIG.

[Explanation of symbols]

10: dishwasher, 11: warehouse, 13: duct, 13b ...
Exhaust port, 15: electric heater, 21: thermal fuse, 22
... thermostat (temperature detecting means), 23 ... temperature sensitive plate.

Continuation of the front page (72) Inventor Shigeru Nishimura 16th Hoshizaki Electric Co., Ltd., 3rd of Sakaemachi South Building, Toyoake City, Aichi Prefecture (56) References JP-A-4-220228 (JP, A) JP-A-4-220227 ( JP, A) JP-A-55-126253 (JP, A) JP-A-3-111018 (JP, A) JP-A-60-126162 (JP, U) JP-A-3-65555 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A duct for introducing outside air into the compartment.
It is arranged along the outside of the surrounding wall forming the body and
Tableware with an electric heater for heating the introduced air in the space
In the washing machine, a temperature-sensitive plate assembled in contact with the electric heater the duct
Adjustably mounted on the inner wall of the
An overheat detecting element such as a thermal fuse for detecting heat
Either attached to the outer peripheral surface of the heater or the
Attach the heater to the outer surface of the
A signal for controlling the energization of the electric heater.
-A temperature detecting element such as a thermostat is placed downstream of the electric heater.
A heater device for a dishwasher, wherein the heater device is attached to an outer surface of the temperature-sensitive plate .