JP3281765B2 - Electric heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heater in which a liquid storage container for storing sake, milk and the like is provided detachably with respect to a heating plate.

[0002]

2. Description of the Related Art A conventional general electric heater is provided with a detachable container on a heating plate having the heater as a heating heat source, and arranged so that the bottom surface of the container is in contact with the heating plate. The contents in the container are configured to be heated by heat conduction of the heater through the heating plate. When taking out the contents of the container, there is known an electric heater which is used by removing only the container from the heating plate.

[0003]

However, in such an electric heater, when the contents are taken out, the container is removed from the heating plate. In this state, the container is placed on the heating plate. If the heating plate is exposed to the outside and the heater is continuously energized, if the user accidentally touches the heating plate by mistake and accidentally touches the heating plate, There was a fear that it would be carried out. In addition, there is a possibility that a fire may occur due to overheating of the heating panel.

[0004] The present invention has been made in view of the above problems, and an electric heater that prevents overheating due to no container being placed and also prevents burns due to misuse by a user. The purpose is to provide.

[0005]

A heating plate having a heater, a liquid container removably mounted on the heating plate and heated by the heater, and swingable up and down with respect to the heating plate. A temperature detecting device that detects the bottom temperature of the liquid storage container and operates when the detected value reaches a set temperature to cut off the power to the heater, and constantly urges the temperature detecting device upward. And an urging means for moving the temperature detection device to an upper limit position when the liquid storage container is removed from the heating plate, wherein the temperature detection device is provided through a through hole of the heating plate. A heat-sensitive body that is exposed and contacts the bottom surface of the liquid storage container, one end of which is fixed to the heat-sensitive body and the other end is opposed to the lower surface of the heating plate with a predetermined interval, and by heat conduction from the heat-sensitive body With a bimetal plate that works It is al structure, the temperature sensing device
Was at the upper limit position, the other end of the bimetal plate was brought close to the lower surface of the heating plate, and the bimetal plate was operated mainly by radiant heat from the heating plate. Further, the other end of the bimetal plate was brought into contact with the lower surface of the heating plate, and the bimetal plate was operated mainly by heat conduction from the heating plate.

[0006]

According to the structure of the electric heater of the present invention, the bimetal plate is brought close to the lower surface of the heating plate when the temperature detecting device is at the upper limit position. When removed from the heating plate, the bimetal plate will detect the high ambient temperature near the bottom surface of the heating plate due to the proximity of the bimetal plate to the bottom surface of the heating plate due to the upward movement of the temperature detection device. As a result, the bimetal plate operates, and the power supply to the heater is cut off. On the other hand, when the liquid storage container is placed on the heating platen, the temperature detection device is moved down by the liquid storage container, whereby the bimetal plate is moved to a position not affected by the temperature of the lower surface of the heating platen. Since the distance is kept away, the bimetal plate detects the temperature of the bottom surface of the liquid container by heat conduction from the heat-sensitive body.

Further, by bringing the bimetal plate into contact with the lower surface of the heating plate, the heat of the heating plate is directly transmitted to the bimetal plate,
The bimetal plate operates to stop supplying power to the heater.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sake brewer according to an embodiment of the present invention shown in FIGS. FIG. 1 is a side view of the sake brewer of the present invention, and FIG. 2 is a cross-sectional view of an essential part taken along line AA of FIG. In the figure, 1 is a liquid storage container 2 for storing sake.
And a main body 12 on which the liquid container 2 is removably mounted.
Is a temperature control knob that slides in the horizontal direction, 5 is a lamp that lights up when the heater is energized, and 37 is a power switch.

The liquid container 2 is made of pottery such as porcelain or porcelain, and has a handle 6 integrally provided from the center to the lower part, a liquid inlet 23, and a liquid inlet 7 formed at the upper part.
And an opening 8 formed in the center of the bottom portion, and a round plate-shaped bottom plate 9 which is fixed so as to cover the opening 8 from below and forms a bottom surface of the container.

The bottom plate 9 is made of a substantially disk-shaped thin plate made of a good heat conductive metal such as aluminum, and has a substantially U-shaped cross section having a rib 10 on the outer periphery. Then, the rib 10 is inserted into an annular groove 11 formed in a concave shape from the outside at the periphery of the opening 8 of the liquid storage container 2, and the annular groove 11 is formed with an adhesive (C) such as silicon. It is filled and sealed so that the liquid inside the liquid container 2 does not leak out.

The main body 12 is provided in a substantially cylindrical main body case 13 having an opening at the top and bottom, a bottom cover 14 for closing a lower opening of the main body case 13, and an upper opening of the main body case 13. A heating platen 15 on which the liquid container 2 is detachably mounted and heated, a sheath heater 16 embedded in the heating platen 15, a temperature of the liquid in the liquid container 2 is detected, and the detected temperature is set. Heater 1
And a temperature detecting device 17 for controlling the power supply to the power supply 6.

The heating plate 15 has a flange 18 on its outer periphery.
Are integrally formed, and the flange 18 is attached to the main body case 1.
An elastic member 22 is interposed therebetween from below to be fixed to the periphery of the upper opening 3. A through-hole 20 through which a heat-sensitive element 19 described later is inserted is formed at the center, and an annular rib 21 that rises up one step is integrally provided on the periphery of the through-hole 20.

FIG. 3 is an enlarged view of the temperature detecting device 17 when the liquid container is removed.

The temperature detecting device 17 has the following configuration. That is, reference numeral 19 denotes a heat-sensitive element having a substantially cylindrical shape made of stainless steel or aluminum and having a flat top surface 36;
Reference numeral 4 denotes a sealing member 26 made of a ring of silicon rubber or the like fitted in an annular groove 25 formed in a side wall of the heat sensitive body 19. The heat sensitive body 19 is provided at the center of the heating plate 15. The top surface 36 protrudes upward from the hole 20 and is slidably provided up and down on the inner surface of the through hole 20 via the sealing member 26. The upper surface 26a of the member 26 is located above the upper end 21b of the rib.

Reference numeral 27 denotes one end fixed to the thermosensitive body 19,
A bimetal plate provided with the other end thereof opposed to the lower surface of the heating plate, and provided with an insulating projection 28 protruding below the other end;
It is mainly heated by the heat conduction from the heat-sensitive body 19,
It is configured to bend downward when the set temperature is reached.

Reference numeral 29 denotes a contact fitting for opening and closing the contacts 29a and 29b by the vertical movement of the projection 28 due to the bending of the bimetal plate 27, and controlling the energization of the heater 16.
Reference numeral 0 denotes an adjustment axis for adjusting the operating position of the contact fitting 29, 3
Numeral 1 denotes a lever fixed to the adjusting shaft 30, 32 denotes a temperature adjusting knob 4 provided at an end thereof,
An operation lever for operating the lever 31 by operating the temperature control knob 4 from the outside to change the set temperature, and the operation lever 33 is provided with the entirety of the temperature detecting device 17 so that the heat sensitive body projects from the through hole of the heating plate. A coil spring 34 that constantly biases the upper part is screwed at one end to the heating plate, and a slide shaft 35 of the temperature detecting device is inserted into the other end, and the temperature detecting device 17 is supported to be vertically movable. It is a board.

The temperature detection device 17
Is always urged upward by the urging force of the coil spring 33, and in a state where the liquid storage container 2 is detached from the heating platen 15, as shown in FIG. The means 33 is configured to move up to the upper limit position and to move the bimetal plate 27 to a position close to the lower surface of the heating platen 15.

On the other hand, the liquid storage container 2 is
5, the top surface 36 of the heat-sensitive body 19 comes into contact with the bottom plate 9 of the liquid storage container 2, and the temperature of the temperature detection device 17 moves down to the lower limit position by the weight of the liquid storage container 2. The bimetal plate 27 is configured to move from the lower surface of the heating board 15 to a position having a predetermined interval.

Next, the operation of the sake brewer configured as described above will be described. The liquid container 2
2 is placed on the heating platen 15 of the main body 12, FIG.
As shown in (2), the bottom plate 9 of the liquid container 2 comes into contact with the top surface 36 of the heat-sensitive body 19 of the temperature detecting device 17, compresses the coil spring 33, and moves the temperature detecting device 17 downward. When the heater is energized in this state, the heating plate 1
5 is heated, the heat is transferred to the liquid in the container via the bottom plate 9 and the hot water is boiled. When the temperature of the hot water in the container reaches a predetermined temperature set by the operation lever, the bimetal plate 27 senses the temperature by the heat conduction from the heat-sensitive body 19, and activates the contact fitting 29. The energization of the heater 16 is cut off. Thereafter, when the temperature of the liquid in the container becomes equal to or lower than the predetermined temperature, the bimetal plate 27 returns, and the heater 16 is energized again.

On the other hand, when the liquid container 2 is removed from above the heating platen 15, the temperature detecting device 17 moves upward to the upper limit position by the elastic force of the coil spring 33 as shown in FIG.

As a result, the bimetal plate 27 moves to a position close to the lower surface of the heating platen 15. At the vicinity of the lower surface of the heating platen, when the heater 16 is energized, the ambient temperature becomes extremely high due to heating by the heater. Since the temperature is high, when the temperature detecting device 17 moves upward, the high ambient temperature is directly detected by the bimetal plate 27, and the radiant heat from the heating plate 15 activates the bimetal plate 27, thereby causing the bimetal plate 27 to operate. Turn off the bracket 29,
Power supply to the heater 16 is stopped.

In this state, if the user touches the heating plate by mistake, the power supply to the heater is stopped, so that the heating plate is not at a high temperature, and the user may get burned. It can be prevented beforehand. In addition, there is no fear of fire due to overheating.

FIG. 4 is a sectional view of a temperature detecting device according to another embodiment. In this embodiment, the bimetal plate 27 is configured to come into contact with the lower surface of the heating platen 15 when the temperature detecting device 17 is moved upward by removing the liquid container 2. In this case, the heat of the heating panel 15 is directly transmitted to the bimetal plate 17 by heat conduction, and the power supply to the heater 16 is reliably stopped by removing the liquid container 2.

[0024]

According to the present invention, by moving the temperature detecting device to the upper limit position with the removal of the liquid storage container,
Since the bimetal plate was brought close to or in contact with the lower surface of the heating plate, the bimetal plate was activated by the radiant heat or heat conduction from the heating plate, and the power supply to the heater was stopped. Even so, it is possible to prevent burns and prevent a fire due to overheating.

[Brief description of the drawings]

FIG. 1 is a side view of a sake kettle of the present invention.

FIG. 2 is a sectional view of a main part of the sake brewer of FIG. 1;

FIG. 3 is an enlarged partial cross-sectional view of the temperature detection device.

FIG. 4 is a cross-sectional view illustrating a temperature detecting device according to another embodiment.

[Explanation of symbols]

 2 Liquid Storage Container 15 Heating Board 16 Heater 17 Temperature Detector 19 Heat Sensitive Element 27 Bimetal Plate 33 Energizing Means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 58-49636 (JP, U) Japanese Utility Model Hei 5-5029 (JP, U) Japanese Utility Model Hei 4-28827 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) A47J 27 / 21,27 / 00 A47J 37/00-37/07

Claims (2)

(57) [Claims] 1. A heating plate having a heater, a liquid container mounted removably on the heating plate and heated by the heater, and provided vertically swingably with respect to the heating plate. While detecting the bottom temperature of the liquid storage container,
A temperature detection device that operates when the detected value reaches a set temperature and cuts off the power to the heater, and constantly urges the temperature detection device upward, so that when the liquid container is removed from the heating plate, An urging means for moving the temperature detecting device to an upper limit position, wherein the temperature detecting device is exposed from a through hole of the heating plate and is in contact with a bottom surface of the liquid storage container; the other end is fixed at one end to the thermosensitive element is opposed with a predetermined gap on a lower surface of the heating plate, is composed of a bimetal plate actuated by thermal conduction from the susceptor, said temperature sensing device is an upper limit position In this case, the other end of the bimetal plate is brought close to the lower surface of the heating plate, and the bimetal plate is operated mainly by radiant heat from the heating plate. 2. A heating plate having a heater, a liquid storage container removably mounted on the heating plate and heated by the heater, and provided to be vertically swingable with respect to the heating plate. While detecting the bottom temperature of the liquid storage container,
A temperature detection device that operates when the detected value reaches a set temperature and cuts off the power to the heater, and constantly urges the temperature detection device upward, so that when the liquid container is removed from the heating plate, An urging means for moving the temperature detecting device to an upper limit position, wherein the temperature detecting device is exposed from a through hole of the heating plate and is in contact with a bottom surface of the liquid storage container; the other end is fixed at one end to the thermosensitive element is opposed with a predetermined gap on a lower surface of the heating plate, is composed of a bimetal plate actuated by thermal conduction from the susceptor, said temperature sensing device is an upper limit position In this case, the other end of the bimetal plate is brought into contact with the lower surface of the heating plate, and the bimetal plate is operated mainly by heat conduction from the heating plate.