JPH0919368A - Electric heat insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a temperature detector from being stuck on a heating panel by the viscosity of liquid and to enable exact temperature control by integrally erecting an annular rib formed while being protruded upward at the peripheral edge part of a through hole on the heating panel, and positioning the upper surface part of the temperature detector higher than the upper end part of the annular rib. SOLUTION: When a liquid storage container 2 is placed on a heating panel 15, a bottom board 9 abuts on the top surface of a thermosensitive body 19 of a temperature detector 17, a coil spring 33 is compressed and the temperature detector moves down. When a heater 16 is electrified in such a state, the heating panel 15 is heated and water is boiled. When the water reaches a set temperature, it is sensed by the temperature detector 17 and the electrification is cut off. When the liquid is erroneously spilled on the heating panel 15 in this case, the liquid moues along the side surface of the thermosensitive body 19 and reaches a part in slidable contact with a through hole 20 on the heating panel 15 but the liquid flows down on the heating panel 15 by the annular rib and does not stay at the corner part between the thermosensitive body 19 and the heating panel 15. Therefore, the liquid is prevented from entering the sliding part of the thermosensitive body 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric warmer in which a liquid container is detachably attached to a heating plate.

[0002]

2. Description of the Related Art In a conventional general electric warmer, a liquid container is formed so as to be separable from a heating plate, and a temperature detecting device for detecting the temperature of the liquid in the liquid container is arranged near the lower part of the heating plate in the main body. It is configured to do. However, in this device, since the temperature of the liquid in the liquid storage container is indirectly detected via the heating plate, it is difficult for the temperature of the liquid to be transmitted to the temperature detection device. In particular, a new liquid is put in the liquid storage container. Then, the heater was not energized immediately and the temperature could not be controlled accurately.

Therefore, the heating plate is provided with a through hole through which the temperature detecting device penetrates, the temperature detecting device is exposed to the upper side of the through hole so as to be movable upward and downward, and is urged upward, so that the temperature detecting device of the liquid container is It has been proposed to make it easy to detect the temperature of the liquid by bringing it into contact with the bottom surface.

[0004]

However, in such an electric warmer, there is a possibility that the temperature detecting device does not surely contact the bottom surface of the liquid container.

That is, as described above, in the electric warmer in which the temperature detecting device moves up and down the through hole of the heating plate, the user mistakenly uses a liquid that becomes viscous when thirsty, such as liquor or milk. When the liquid overflows on the heating plate, the overflowed liquid permeates the sliding part between the temperature detection device and the heating plate, and when the permeated liquid is dried by the heat of the heater, its viscosity causes smooth sliding of the temperature detection device. The movement may be hindered, and the temperature detection device may be fixed to the through hole of the heating plate. Further, since the temperature detecting device does not slide upward due to sticking, the temperature detecting device does not surely contact the bottom surface of the liquid storage container, which causes a problem that the temperature of the sake is not accurately transmitted to the temperature detecting device.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an electric warmer capable of preventing the temperature detecting device from sticking to a heating platen due to the viscosity of a liquid and performing accurate temperature control. To aim.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a heating plate having a heater, a liquid storage container detachably mounted on the heating plate, and an upper surface portion exposed from a through hole of the heating plate. And 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 heater, and the temperature detecting device is provided in the through hole. In contrast to the electric warmer, which is provided so as to be slidable up and down, is constantly urged upward by the urging means, and the upper surface portion is in contact with the bottom surface of the liquid storage container,
An annular rib formed so as to project upward is integrally provided upright on the peripheral edge of the through hole of the heating plate, and the upper surface of the temperature detecting device is positioned above the upper end of the annular rib. Further, a sealing member is interposed between the through hole of the heating plate and the temperature detecting device. Further, the sealing member is fitted in an annular groove formed in the temperature detecting device.

[0008]

According to the structure of the electric warmer of the present invention, the liquid flowing from the upper side of the temperature detecting device is heated by the annular rib formed on the peripheral portion of the through hole penetrating the temperature detecting device. The liquid smoothly flows down to the upper surface, the liquid does not stay at the corner between the temperature detecting device and the heating plate, and the liquid is prevented from soaking into the sliding portion between the temperature detecting device and the through hole.

Further, the sealing member interposed between the through hole of the heating plate and the temperature detecting device prevents the liquid from entering and prevents the heat of the heating plate from being transferred to the temperature detecting device.

[0010]

Embodiments of the present invention shown in FIGS. 1 to 3 will be described in detail below. FIG. 1 is a side view of the electric warmer of the present invention,
2 is a sectional view taken along line AA of FIG. In the figure, reference numeral 1 denotes an electric warmer comprising a liquid storage container 2 for storing a liquid such as liquor or milk, and a main body 12 on which the liquid storage container 2 is detachably mounted, and 3 indicates a control panel, 4 Is a temperature control knob that slides laterally, and 5 is a lamp that lights up when the heater is energized.

The liquid container 2 is made of pottery or porcelain, and has a handle 6 integrally provided from the central portion to the lower portion, a water inlet 23, and a water inlet 7 formed at the upper portion.
And a through hole 8 formed in the center of the bottom portion, and a round plate-shaped bottom plate 9 that constitutes the bottom surface of the container by being fixed so as to cover the through hole 8 from below.

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

The body 12 is provided in a substantially cylindrical body case 13 having upper and lower openings, a bottom cover 14 that closes the lower opening of the body case 13, and an upper opening of the body case 13. A heating plate 15 on which the liquid storage container 2 is detachably mounted and heated, a sheath heater 16 embedded in the heating plate 15, and the temperature of the liquid in the liquid storage container 2 are detected, and the detected temperature is set. Heater 1 to the value
6 and a temperature detection device 17 for controlling energization to the device 6.

The heating plate 15 has a flange 18 on the outer peripheral portion.
Is integrally formed, and the flange 18 is connected to the main body case 1
The elastic member 22 is fixed to the periphery of the upper opening of the sheet 3 from below so as to be in close contact with the elastic member 22. A through hole 20 for inserting a heat sensitive body 19, which will be described later, is formed at the center, and an annular rib 21 which is raised upward by one step is integrally provided on the peripheral edge of the through hole 20. FIG. 3 is an enlarged view of the temperature detecting device 17.

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

One end of 27 is fixed to the heat sensitive body 19,
The other end is a bimetal plate provided with an insulating projection 28 protruding downward, and is heated mainly by heat conduction from the heat sensitive body 19 and bent downward at a set temperature.

Reference numeral 29 is a contact fitting for controlling the energization of the heater 16 by opening and closing the contacts 29a and 29b by the vertical movement of the projection 28 caused by the bending of the bimetal plate 28.
0 is an adjusting shaft for adjusting the operating position of the contact fitting 29, 3
Reference numeral 1 is a lever fixed to the adjustment shaft 30, 32 is an operating lever that operates the lever 31 from the outside of the main body case 13 to change the set temperature, and 33 is a protrusion of the heat sensitive body from a through hole of the heating plate. A coil spring 34 constantly urges the entire temperature detecting device 17 upward so that one end is screwed to the heating plate, and a sliding shaft 35 of the temperature detecting device is inserted into the other end to insert the temperature detecting device 17 into the temperature detecting device 17. Is a support plate that supports up and down movement.

The temperature detecting device 17 as described above is used.
Is always urged upward by the urging force of the coil spring 33, and when the liquid storage container 2 is placed on the heating plate 15, the top surface 36 of the heat sensitive body 19 is constantly fixed to the bottom plate of the liquid storage container 2. 9 is abutted.

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

When the liquid container 2 is placed on the heating plate 15 of the main body 12, the bottom plate 9 of the liquid container 2 is placed above the heat sensitive body 19 of the temperature detecting device 17, as shown in FIG. It comes into contact with the surface 36 and compresses the coil spring 33 to move the temperature detecting device 17 downward. When the heater is energized in this state, the heating plate 15 is heated and the heat is transferred to the liquid in the container via the bottom plate 9 to boil the hot water. When the hot water in the container reaches a predetermined temperature set by the operation lever, the temperature detecting device 17 detects it through the heat sensitive body 19 and shuts off the energization of the heater 16. After that, when the temperature of the liquid in the container becomes equal to or lower than the predetermined temperature, the temperature detecting device 17 energizes the heater 16 again.

On the other hand, when the liquid container 2 is not placed on the heating plate 15, the elastic force of the coil spring 33 moves the temperature detecting device 17 upward as shown in FIG.

In this state, if the user accidentally overflows the liquid onto the heating plate 15, the liquid is transferred to the heat sensitive body 19.
Although it reaches the sliding part of the heating plate 15 with the through hole 20 along the side surface of the heating plate, the liquid smoothly flows down onto the heating plate by the annular rib, and the liquid does not remain at the corner portion between the heat sensitive body and the heating plate. Therefore, it is possible to prevent the liquid from seeping into the sliding portion of the heat sensitive body.

By interposing a sealing member 26 between the through hole 20 of the heating plate 15 and the heat sensitive body 19 of the temperature detecting device 17, the sliding portion between the heat sensitive body 19 and the through hole 20 is sealed. The state is improved, and the heat transfer by the sealing member is blocked by the sealing member, so that the heat of the heating platen 15 is prevented from being transferred to the heat sensitive body 19. Therefore, the heat of the heating platen directly heated by the heater is transferred to the heat sensitive body, and the temperature detecting device is prevented from erroneously detecting the temperature of the liquid.

[0024]

According to the present invention, the annular rib formed on the peripheral portion of the through hole penetrating the temperature detecting device prevents the liquid from seeping into the sliding portion between the temperature detecting device and the through hole. Therefore, it is possible to solve the problem that the temperature detecting device is fixed to the sliding portion due to the viscosity of the liquid.

The sealing member interposed between the through hole of the heating plate and the temperature detecting device prevents the liquid from entering and prevents the heat of the heating plate from being transmitted to the temperature detecting device.
The temperature can be controlled surely.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the electric warmer of FIG.

FIG. 3 is an enlarged partial sectional view of a temperature detection device.

[Explanation of symbols]

 2 Liquid Storage Container 15 Heating Plate 16 Heater 17 Temperature Detection Device 20 Through Hole 21 Annular Rib 33 Biasing Means

Claims (3)

[Claims] 1. A heating plate having a heater, a liquid storage container detachably mounted on the heating plate, and an upper surface portion of the heating plate exposed through a through hole of the heating plate. And a temperature detection device that detects the bottom temperature of the device and operates when the detected value reaches a set temperature, and cuts off the power supply to the heater,
The temperature detecting device is provided so as to be slidable up and down with respect to the through hole, and is constantly urged upward by urging means so that the upper surface portion is brought into contact with the bottom surface of the liquid storage container. In the heat retaining device, an annular rib formed so as to project upward is integrally provided upright on the peripheral edge of the through hole of the heating plate, and the upper surface of the temperature detecting device is positioned above the upper end of the annular rib. Electric warmer characterized by 2. An electric warmer according to claim 1, wherein a sealing member is interposed between the through hole of the heating plate and the temperature detecting device. 3. The electric warmer according to claim 2, wherein the sealing member is fitted in an annular groove formed in the temperature detecting device.