JP3258870B2 - 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 for heating a liquid container containing alcohol, milk and the like to a predetermined temperature by a heater provided at a lower portion.

[0002]

2. Description of the Related Art In a conventional general electric heater, a liquid storage container is formed so as to be separable from a heating plate, and a temperature detecting device for detecting a temperature of the liquid in the liquid storage container is arranged near a lower portion of the heating plate in a main body. Configuration. However, in this device, the temperature of the liquid in the liquid container is indirectly detected via the heating plate, so that the temperature of the liquid is hardly transmitted to the temperature detecting device. In this case, the heater was not immediately energized and accurate temperature control could not be performed.

[0003] Therefore, a through-hole through which a temperature detecting device penetrates is provided in a heating plate, and the temperature detecting device is exposed upward and freely upward and downward from the through-hole so as to be urged upward, so that the temperature detecting device is connected to the liquid container. There has been proposed a device in which the temperature of the liquid is easily detected by contacting the bottom surface.

[0004]

However, in such an electric heater, when the liquid overflows into the through hole of the heating panel and the sliding portion of the temperature detecting device, the liquid flows from the sliding portion into the main body. There is a problem that the liquid may enter, and if the liquid that has entered enters the vicinity of the temperature detecting device, which is a charging section, insulation is deteriorated and electric shock may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is intended to reduce the insulation of a temperature detecting device due to water leaking from a sliding portion between a through hole of a heating panel and a heat sensitive body of the temperature detecting device. An object of the present invention is to provide an electric heater that prevents an accident such as electric shock.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a heating plate having an electric heater and a liquid container which is removably mounted on the heating plate and heated by the electric heater are provided. A container which is provided so as to be capable of swinging up and down with respect to the heating plate, detects a bottom temperature of the liquid storage container, and operates when the detected value reaches a set temperature to cut off the power supply to the electric heater. An electric heater provided with a sensing device, wherein the temperature sensing device is exposed from a through hole of the heating plate and is in contact with a bottom surface of the liquid storage container; A bimetal plate that controls energization of a heater, and a gutter disposed between the heat-sensitive body and the bimetal plate and formed to have a larger diameter than the through-hole and receiving water leaking from the through-hole, End of the gutter Wherein and is projected outwardly from a side portion of the temperature sensing device, and a configuration in which a drainage portion for discharging the leakage to the protruded portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sake brewer according to an embodiment of the present invention shown in FIGS. 1 to 4 will be described in detail below. FIG. 1 is a side view of the sake brewer of the present invention, FIG. 2 is a cross-sectional view of a main part taken along line AA of FIG. 1, and FIG. 4 is a bottom view. In the figure, reference numeral 1 denotes a drink container comprising a liquid storage container 2 for storing a liquid such as alcohol or milk, and a main body 3 on which the liquid storage container 2 is removably mounted. Is a temperature control knob that slides in the horizontal direction, 6 is a lamp that lights up when the heater is energized, and 7 is a power switch.

The liquid container 2 is made of pottery, porcelain or the like, and has a handle 8 provided integrally from the center to the lower part, a liquid inlet 9 and a liquid inlet 10 formed at the upper part.
And an opening 11 formed in the center of the bottom, and a round plate-shaped bottom plate 12 which is fixed so as to cover the opening 11 from below and forms a bottom surface of the container.

The bottom plate 12 is made of a substantially disc-shaped thin plate made of a good heat conducting metal such as aluminum, and has ribs 13 on its outer periphery.
Is formed in a substantially U-shaped cross section. Then, the rib 13 is inserted into an annular groove 14 formed in a concave shape from the outside at the periphery of the opening 11 of the liquid storage container 2, and the annular groove 14 is filled with an adhesive 15 such as silicon. The liquid container 2 is sealed so that the liquid inside the liquid container 2 does not leak outside.

The main body 3 is provided in a substantially cylindrical main body case 16 having an opening at the top and bottom, a bottom cover 17 for closing a lower opening of the main body case 16, and an upper opening of the main body case 16. A heating plate 18 for detachably mounting and heating the liquid storage container 2, an electric heater 19 such as a sheath heater embedded in the heating plate 18, and detecting the temperature of the liquid in the liquid storage container 2; A temperature detecting device 2 for controlling energization of the electric heater 19 so that the detected temperature becomes a set value.
0.

The heating plate 18 has a flange 21 on its outer periphery.
Are integrally formed, and the flange 21 is attached to the main body case 1.
The elastic member 22 is fixed to the peripheral edge of the upper opening 6 from below in such a manner that the elastic member 22 is brought into close contact therewith. In the center, a through hole 24 through which a heat sensitive body 23 to be described later is inserted is formed, and a water seal made of an elastic rubber such as silicon rubber is provided between an inner peripheral edge of the through hole 24 and the heat sensitive body 23. Packing 2
5 are provided.

The water seal packing 25 has a substantially cylindrical shape.
By setting the inner diameter of the upper part 25a to be slightly larger than the outer diameter of the heat sensitive body 23, the upper part 25a is formed so as to be freely slidably fitted with the heat sensitive body 23, and the center of the lower part 25b bulges outward. The hollow portion 26 is formed, and the inner diameter of the lower end portion 25c is formed so as to be fitted in a watertight manner with the outer diameter of the heat sensitive body 23.

Further, ribs 25d and 25e are integrally extended outwardly from the upper portion 25a.
d and e are formed in a substantially C-shaped cross section so as to sandwich the upper and lower surfaces of the through holes 24 of the heating plate 18.
Is configured to be fitted and fixed by sandwiching.

FIG. 3 is an enlarged view of the temperature detecting device 20 when the liquid container 2 is removed.

The temperature detecting device 20 has the following configuration. Reference numeral 23 denotes a thermosensitive element made of stainless steel or aluminum and has a substantially cylindrical top surface 23a, and 23b.
Is an annular groove formed in a side wall of the heat sensitive body 23, filled with grease or the like, and serves to keep a sliding portion between the packing 25 and the heat sensitive body 23 watertight. The heat sensitive body 23 is formed through the through hole 24 provided in the heating plate 18 through the top surface 2.
3a is protruded upward, and is slidably provided vertically through the water seal packing 25 fixed to the inner peripheral edge of the through hole 24.

Reference numeral 27 denotes one end fixed to the thermosensitive body 23,
A bimetal plate having the other end opposed to the lower surface of the heating plate 18 and provided with an insulating protrusion 28 protruding downward from the other end. The bimetal plate is heated mainly by heat conduction from the thermosensitive body 23 and has a set temperature. When it becomes, it is comprised so that it may bend below.

Reference numeral 29 denotes a contact fitting for opening and closing the contacts 29a and 29b by moving the projection 28 upward and downward due to the bending of the bimetal plate 27, and controls the energization of the electric heater 19; An adjusting shaft for adjustment, 31 is a lever fixed to the adjusting shaft 30, 32 is an operating lever for operating the lever 31 from outside the main body case 16 to change a set temperature, and 33 is a heating lever for heating the thermosensitive body 23. A coil spring that constantly urges the entire temperature detecting device 20 upward so as to protrude from the through hole 24 of the panel 18, one end of which is screwed to the heating panel 18,
A support plate for inserting the sliding shaft 35 of the temperature detecting device 20 into the other end and supporting the temperature detecting device 20 so as to be vertically movable, 3
Reference numeral 6 denotes a gutter disposed between the heat sensitive body 23 and the bimetal plate 27 to receive water leaking from a sliding portion between the through hole 24 and the heat sensitive body 23.

The gutter 36 is formed of a flat plate having a substantially rectangular shape, and one side and an opposing piece thereof are partitioned so as not to spill the received water, and are directed upward so as to guide the water leak toward a drain section described later. The rib 36a is integrally formed to have a substantially U-shaped cross section, and the other side is opened so as to be flush with the bottom surface of the gutter 36 so as to discharge the water leak guided by the rib 36a. A drainage section 36b is provided. The drainage portion 36b is provided so as to protrude outside the terminal portions 29c and 29d of the temperature detection device 20.

The temperature detection device 20
Is always urged upward by the urging force of the coil spring 33, and in a state where the liquid container 2 is removed from the heating plate 18, as shown in FIG. The device 33 is configured to move upward to the upper limit position.

At this time, when the temperature detecting device 20 moves to the upper limit position, the lower end 25c of the packing 25 fixed to the heat sensitive body 23 also moves upward integrally with the heat sensitive body 23. When the portion 26 is deformed and compressed, the moving amount of the thermosensitive body 23 is absorbed.

On the other hand, the liquid storage container 2 is
8, as shown in FIG. 2, the top surface 23 a of the heat sensitive body 23 contacts the bottom plate 12 of the liquid storage container 2, and the heat sensitive body 23 is moved to the lower limit position by the weight of the liquid storage container 2. , And the deformation of the hollow portion 26 is restored with the downward movement of the heat-sensitive body 23.

Next, the operation of the electric heater configured as described above will be described.

When the liquid container 2 is placed on the heating plate 18 of the main body 3, the bottom plate 12 of the liquid container 2 is attached to the heat sensitive body 23 of the temperature detecting device 20 as shown in FIG. It comes into contact with the surface 23a and compresses the coil spring 33 to move the temperature detecting device 20 downward. When the electric heater 19 is energized in this state, the heating plate 18 is heated, and the heat is transmitted to the liquid in the container 2 via the bottom plate 12 and the hot water is boiled. When the temperature of the hot water in the container 2 reaches a predetermined temperature set by the operation lever 32, the bimetal plate 27 senses the temperature by the heat conduction from the heat sensitive body 23, and activates the contact fitting 29. Then, the energization of the electric heater 19 is cut off. Then, container 2
When the temperature of the liquid in the inside becomes equal to or lower than the predetermined temperature, the bimetal plate 27 returns, and electricity is supplied to the electric heater 19 again, and the temperature is maintained at the set temperature by repeating this operation.

When liquid such as alcohol overflows onto the heating platen 18 when the liquid container 2 is attached or detached, the liquid enters the inside of the main body through a sliding portion between the heat sensitive body 23 and the through hole 24. The heat sensitive body 23 and the through hole 2
4, the water seal packing 25 provided between
The penetration of the liquid into the body is prevented.

However, it is conceivable that some trouble may occur in the water sealing action of the water sealing packing 25 and the liquid leaks over the water sealing packing 25 and leaks to the bimetal plate 27 side. The leaked liquid is received by the gutter 36 provided between the thermosensitive body 23 and the bimetal plate 27, and the liquid is prevented from entering the bimetal plate 27 any more.
Then, the liquid received on the gutter 36 is
It is guided to 6a and is discharged to the bottom plate 17 side from drainage portions 36b provided at both ends thereof.

At this time, since the drainage portion 36b protrudes outside the terminal portions 29c, d of the temperature detecting device 20, the liquid discharged from the drainage portion 36b causes the liquid discharged from the terminal portions 29c, d and the contact points. The discharged liquid does not flow into a charging part such as the metal fitting 29, and the discharged liquid is discharged to the outside of the main body from a drain port (not shown) provided in the bottom plate 17.

As described above, even if a liquid such as alcohol that the user has erroneously overflowed leaks into the main body through the gap between the heat sensitive body 23 and the through hole 24, the liquid is provided in the temperature detecting device 20. The leaked liquid is received and drained by the trough 36, so that the liquid is prevented from entering the charged portion of the temperature detecting device 20, and an accident such as electric shock can be prevented.

[0028]

According to the present invention, since water leaking from the through hole of the heating plate is received and discharged by the gutter provided in the temperature detecting device, an electric shock due to a decrease in insulation of the temperature detecting device due to the water leakage. Such accidents can be prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a side view of an electric heater according to the present invention.

FIG. 2 is a sectional view of the electric heater of FIG. 1;

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

FIG. 4 is a bottom view in a state where a bottom plate is removed.

[Explanation of symbols]

 2 Liquid Storage Container 18 Heating Board 19 Electric Heater 20 Temperature Detector 23 Heat Sensitive Element 24 Through Hole 27 Bimetal Plate 36 Gutter 36b Drainage Unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-96714 (JP, A) JP-A-2-264615 (JP, A) JP-A-61-151719 (JP, A) JP-A-4- 135518 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 27/00, 27/21

Claims (1)

(57) [Claims] 1. A heating plate having an electric heater, a liquid container removably mounted on the heating plate and heated by the electric heater, and provided to be vertically swingable with respect to the heating plate. A temperature detecting device for detecting the bottom temperature of the liquid storage container and operating when the detected value reaches the set temperature and interrupting the supply of power to the electric heater. A heat-sensitive body exposed from the through hole of the heating plate and in contact with the bottom surface of the liquid storage container; a bimetal plate provided below the heat-sensitive body to control the supply of electricity to the electric heater; A gutter arranged between the bimetal plate and having a larger diameter than the through-hole and receiving water leaking from the through-hole;
An electric heater, wherein an end of the gutter protrudes outward from a side of the temperature detecting device, and a drain portion for discharging the water leakage is provided at the protruding portion.