JPS64802Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The present invention relates to an electric water heater that is equipped with a main temperature controller that controls the boiling temperature of liquid in a container and an auxiliary temperature controller that controls the heat retention temperature. be.

Structure of a conventional example and its problems As shown in FIG. The main temperature regulator 23 for controlling the boiling temperature of the liquid is located above the heating element 22 and disposed on the outer circumferential side of the container 21, or
Alternatively, it was arranged on the bottom of the container 21.

Further, the heat sensitive part 25 of the auxiliary temperature regulator 24 that controls the heat retention temperature is attached below the lowermost end surface 26 of the heating element 22 or on the bottom surface of the lowermost end of the container 21 to control the temperature of the liquid in the container 21.

In this case, water is poured into the container 21 and the heating element 2
2, the water temperature rises, and when it reaches a predetermined temperature, the main temperature regulator 23 opens, and the power supply to the heating element 22 is stopped, completing the boiling of water. After that, by controlling the water temperature with the auxiliary temperature regulator 24,
Although the heat retention temperature control is carried out, due to the positional relationship of the installation of the heating element 22 and the auxiliary temperature regulator 24, the water temperature is difficult to rise directly above the bottom of the container 21 due to the heating structure, and the central part of the container 21 is The water temperature is quite low compared to the air temperature.

Therefore, it is necessary to set the individual temperature setting value of the auxiliary temperature regulator 24 to a considerably lower temperature with respect to the water temperature in the center of the container 21 to establish a temperature correlation, and as a result, the range of variation for the predetermined temperature setting value is As the water heater becomes larger, it can cause boiling and cause deterioration of the various parts that make up the electric water heater, resulting in poor durability.

Further, a protector such as a temperature fuse is also provided at the same position as the auxiliary temperature regulator 24, and therefore, if the main and auxiliary temperature regulators 23, 24 are short-circuited, the operation of the temperature fuse becomes uncertain.
There were some deficiencies in terms of reuse.

Purpose of the invention The present invention aims to improve the above-mentioned conventional problems and provide an electric water heater that can perform highly accurate control by bringing the temperature of the liquid in the container closer to the operating temperature of the temperature controller, etc. The purpose is to

Structure of the Invention In order to achieve the above object, the electric water heater of the present invention has a heating element attached to the outer peripheral surface of the lower part of a cylindrical container with a bottom, and a main temperature controller for controlling the water boiling temperature in the container. In an electric water heater located near the upper end of the body and attached to the outer peripheral side of the container,
An auxiliary temperature regulator for controlling the heat retention temperature and a temperature fuse located on the side of the heating element are held together by a mounting plate made of a material with good thermal conductivity,
In addition, this mounting plate is brought into close contact with the outer bottom surface of the container located above the lower end surface of the heating element.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 4, 1 is the water heater body, and 2 is its base. 3 is a body mounted on this base 2, and 4 is a spout mounted on the body 3, which supports a bottomed cylindrical container 5 at its inner step.

6 is an inner lid unit, and 7 is an upper lid unit which, by pressing a push plate 8, forces air and discharges water or hot water stored in the container 5 from a discharge port 9. Reference numeral 10 denotes a heating element that includes a main heating element and an auxiliary heating element, and is wrapped around the outer periphery of the lower part of the container 5. Reference numeral 11 denotes a main temperature regulator that controls the boiling temperature of the liquid in the container 5. The main temperature regulator 11 is located near the upper end of the heating element 10 and attached to the outer circumferential side of the container 5.

A first mounting plate 12 is fixed to the bottom of the container 5, and a second mounting plate 13 is screwed thereto. Reference numeral 14 denotes an auxiliary temperature regulator, and the auxiliary temperature regulator 14 has a substantially convex outer surface located above the lowermost end surface 15 of the heating element 10 and the lowermost end surface 16 of the bottomed cylindrical container 5. It is arranged on the bottom surface 17. Reference numeral 18 denotes a temperature fuse, and this temperature fuse 18 is mounted on a mounting plate 18 made of a material with good thermal conductivity, such as an aluminum plate.
A is integrally held together with the auxiliary temperature regulator 14. This temperature fuse 18 is located close to the heating element 10 side, and the second mounting plate 1
The mounting plate 1 is secured by a presser spring 19 screwed onto the
8a is brought into close contact with the outer bottom surface 17 of the container 5.

The circuit configuration is as shown in FIG.
Main heating element 10a and main temperature controller 11 built in
are connected in series, the auxiliary heating element 10b and the auxiliary temperature regulator 14 are connected in series, and these are connected in parallel. This parallel connection is connected to the temperature fuse 18.
It is connected to the power supply 20 via.

Next, the operation in the above configuration will be explained.

Water is put into the container 5 and energized, and when the water temperature reaches a predetermined temperature, the main temperature regulator 11 is activated and opened.
Next, the auxiliary temperature regulator 14 operates as the water temperature rises and falls to maintain a warm state. In this case, since the auxiliary temperature regulator 14 is disposed above the lowest end surface 15 of the heating element 10, the operating temperature of the auxiliary temperature regulator 14 and the water temperature are brought closer to each other. As a result, it is possible to provide better temperature control for maintaining the heat retention temperature. In other words, there is less variation with respect to a predetermined temperature, the operating range of water temperature can be reduced, and the difference in water temperature in the center of the container 5 and the water temperature near the bottom surface is close to each other, so when pouring, a uniform and higher temperature can be achieved. in,
A stable water temperature can be obtained.

Also, the water temperature when boiling water and the main temperature controller 1
The temperature sensitivity characteristic of No. 1 is such that the main temperature regulator 11 is located near the upper end of the heating element 10 and attached to the outer peripheral side of the container 5, so that the heating element 10 is difficult to receive direct radiation heat from the heating element 10. If it is installed at the top of the joint of 10 or in a position that balances the distance with the heating element 10, the water temperature rises when boiling water and the main temperature controller 1
1 can be brought closer to the operating temperature of the single unit.

In the unlikely event that the main temperature controller 11 and the auxiliary temperature controller 14
Even if the heating element short-circuits and becomes dry, the circuit can be opened in an extremely short time because the temperature fuse 18 is placed close to the heating element 10 side.
Further, by replacing the temperature fuse 18, it is possible to reuse it.

Effects of the Invention As is clear from the description of the above embodiments, according to the present invention, a heating element is attached to the outer peripheral surface of the lower part of a cylindrical container with a bottom, and a main temperature regulator for controlling the boiling temperature in the container is attached to the outer peripheral surface of the bottom of the cylindrical container. In an electric water heater that is located near the upper end of the heating element and attached to the outer peripheral side of the container, an auxiliary temperature regulator that controls the heat retention temperature and a temperature fuse located close to the heating element are connected to a thermally conductive It is held together by a mounting plate made of a good material, and this mounting plate is brought into close contact with the outer bottom surface of the container located above the lower end surface of the heating element. By having such a structure,
In the heat-retaining state that is used for a long time, the variation in the heat-retaining temperature with respect to the predetermined temperature is reduced, and the operating range of the water temperature is also narrower. Furthermore, the difference in water temperature in the center of the container and near the bottom is close to each other, so when pouring Since it is possible to obtain a uniform and stable water temperature at a higher temperature and to minimize the possibility of boiling, it is possible to improve the durability of each part that makes up the electric water heater.

In addition, even if the main temperature controller and auxiliary temperature controller are short-circuited, resulting in a dry cooking condition, the temperature fuse is placed close to the heating element, so the circuit can be opened in an extremely short time. Moreover, it can be reused by replacing the temperature fuse.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of an electric water heater showing an embodiment of the present invention, Fig. 2 is a sectional view of the electric water heater, Fig. 3 is a sectional view of the main parts, and Fig. 4 is the electric circuit. FIG. 5 is a partially cutaway sectional view of a conventional electric water heater. 5... Container, 10... Heating element, 11... Main temperature controller, 14... Auxiliary temperature regulator, 17... Outer bottom surface of container, 18... Temperature fuse, 18a... Mounting plate.

Claims (1)

[Scope of utility model registration request] A heating element is attached to the lower outer circumferential surface of a bottomed cylindrical container, and a main temperature regulator for controlling the boiling temperature of the liquid in the container is attached to the outer circumferential side of the container, located near the upper end of the heating element. In an electric water heater, an auxiliary temperature regulator for controlling the heat retention temperature and a temperature fuse located close to the heating element are held together by a mounting plate made of a material with good thermal conductivity, and this mounting An electric water heater in which a plate is closely attached to the outer bottom surface of the container located above the lower end surface of the heating element.