JP3286502B2 - 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 entered liquid enters the vicinity of the temperature detecting device, which is a charged part, insulation is deteriorated and electric shock may be caused. Therefore, there is a method in which a water seal packing is provided on the sliding portion to seal a gap between the sliding portions. However, when the sealing performance is increased, the sliding resistance of the sliding portion increases, and the vertical movement of the temperature detecting device is increased. However, if the sliding resistance of the sliding part is reduced in consideration of the vertical movement of the temperature detecting device, the sealing performance of the sliding part will be reduced, and water leakage from the sliding part will occur. Had the problem of becoming easier.

The present invention has been made in view of the above problems, and prevents water from leaking at a sliding portion between a through hole of a heating panel and a heat sensitive body of a temperature detecting device. An object of the present invention is to provide an electric heater that prevents the accident of the above.

[0006]

SUMMARY OF THE INVENTION A heating plate having an electric heater, a liquid container removably mounted on the heating plate and heated by the electric heater, and an up-down swing with respect to the heating plate. A temperature detecting device is provided movably and detects the 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 that is exposed from the through hole of the heating plate and is in contact with the bottom surface of the liquid storage container, and is constantly urged upward by an urging means. the sliding portion between the susceptors is interposed an annular water seal packing, the packing, the inner periphery slidably Yu the fitting to and the thermosensitive body fitting state of the heating plate through-holes was the upper , Extending from the top and The and lower end provided and composed of a lower portion and attached to the susceptor.

Further, the central portion of the packing bottom is <br/> bulged outwardly to form the hollow portion of the annular between the susceptor outer wall.

[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, 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 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. That is, 23 is a substantially cylindrical heat-sensitive body made of stainless steel or aluminum, and the top surface 23a is a flat surface,
Reference numeral 26 denotes an annular groove formed on the side wall of the heat sensitive body 23, which is filled with grease or the like.
It works to keep the sliding part watertight. The heat sensitive body 23
The upper surface 23a protrudes upward from the through hole 24 provided in the heating plate 18 and is slidable up and down via the water seal 25 fixed to the inner peripheral edge of the through hole 24. It is provided in.

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 the vertical movement of the projection 28 due to the bending of the bimetal plate 27, and controls the energization of the electric heater 19; An adjusting shaft for adjusting, 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 cover which is arranged between the heat sensitive body 23 and the bimetal plate 27 and covers the temperature detecting device 20 from above to prevent water droplets from entering the temperature detecting 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.

The sliding portion between the upper part 25a of the water seal packing 25 and the thermosensitive body 23 is provided with a slight gap so that the sliding action of the thermosensitive body 23 is performed smoothly. If a liquid such as alcohol overflows onto the heating plate 18 by mistake, the liquid such as alcohol may enter the gap, but the liquid is removed by the grease filled in the annular groove 27 of the thermosensitive member 23. Above, it does not get inside the main body.

However, it is conceivable that the grease may impede the water seal, causing the liquid to pass through the grease. In this case, the gap between the heat sensitive body 23 and the upper portion 25a of the water seal packing 25 is removed. Is transmitted to the lower portion 25b of the packing 25, the lower end 25c of the packing 25 is attached to the heat sensitive body 23 in a water-tight manner. The liquid does not leak to the plate 27 side, and the entered liquid is stored in a hollow part formed in the lower part 25b.

On the other hand, when the liquid container 2 is removed from above the heating plate 18, the temperature detecting device 20 moves upward to the upper limit position by the elastic force of the coil spring 33 as shown in FIG.

As a result, the heat sensitive body 23 moves to the upper limit position, and the lower end 25c of the packing 25 also moves upward with the upward movement of the heat sensitive body 23. When the lower end portion 25c moves upward, the hollow portion 26 formed in the lower portion 25b is deformed and compressed, and the volume of the hollow portion 26 is reduced. The liquid contained in the hollow portion 26 is extruded by the compression of the hollow portion 26, and most of the liquid is discharged onto the heating plate 18 through a gap between the heat sensitive body 23 and the upper portion 25 a of the packing 25. Will be done.

As described above, even if the liquid such as alcohol that the user has erroneously overflowed flows into the hollow portion through the gap between the heat sensitive body and the packing, and the hollow portion is filled with the liquid, The liquid is automatically discharged from the hollow portion by the vertical movement of the temperature detecting device accompanying the attachment / detachment of the liquid storage container to / from the heating plate, and the liquid is prevented from remaining in the hollow portion.

[0029]

According to the present invention, the water seal packing is interposed between the heat sensitive body and the through hole, the upper part of the packing is loosely fitted, the lower part is provided to be extendable and the lower end part is connected to the heat sensitive body. Since it has been attached, it is possible to prevent water leakage at the sliding part between the through hole of the heating panel and the heat sensitive body of the temperature detection device, and to prevent accidents such as electric shock due to deterioration of insulation beforehand. Up and down movement can be performed smoothly.

Further, since the hollow portion is formed at the lower portion of the water seal packing, the liquid accumulated in the hollow portion is automatically discharged by the upward movement of the temperature detecting device, and the liquid may remain in the hollow portion for a long time. Is prevented.

[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.

[Explanation of symbols]

 2 Liquid Storage Container 18 Heating Board 19 Electric Heater 20 Temperature Detector 23 Heat Sensitive Element 24 Through Hole 25 Water Seal 25a Upper 25b Lower 25c Lower 26 Lower Hollow 33 Energizing Means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-96714 (JP, A) JP-A-3-139313 (JP, A) JP-A-5-49533 (JP, A) 28070 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47J 27/21, 27/00

Claims (2)

(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 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 supply to the electric heater. An electric heater which is exposed from the through hole and is in contact with the bottom surface of the liquid storage container, and is constantly urged upward by an urging means; an annular water sealing packing is interposed in a sliding portion, the packing, the upper part was fitted to and slidably Yu fitted state the heat sensing element with the inner periphery of the through-hole of the heating panel, the upper Extendable up and down and provided at the lower end Electric heater which is characterized by comprising a lower portion and attached to the susceptor. 2. The electric heater according to claim 1, wherein a center portion of the lower portion of the packing is bulged outward, and an annular hollow portion is formed between the packing and the outer wall of the heat-sensitive body.