JPH0465682B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat insulator for general household use.

Prior Art A conventional heat insulator of this type had a structure as shown in FIG. That is, in this Figure 6,
1 is a cooking utensil main body, and 2 is a bottomed cylindrical inner frame disposed in the main body 1. This inner frame 2 is provided with a bottom heater 3 on the bottom surface and a side heater 4 on the side surface. 5
is a heat insulating material placed in the gap between the main body 1 and the inner frame 2,
Reference numeral 6 denotes a cylindrical container with a bottom that is detachably housed within the inner frame 2. 7 is a lid that can be opened and closed to cover the top opening of the main body 1; 8 is a control component that detects the temperature of the container 6 and controls the bottom heater 3 and the side heater 4; (about 70
℃). Reference numeral 9 denotes a display unit that displays the energization state.

Problems to be Solved by the Invention However, in such a structure, it is not possible to check the amount of heat insulating material from the outside, so the lid 7 must be opened in order to check the amount of heat insulating material. . In this case, when the lid 7 is opened, the hot air from the heat-insulating material will be released from the top opening of the container 6, causing the temperature of the heat-insulating material to drop rapidly, and in order to raise it to the heat-retaining temperature again,
This was also an economic problem because it required a large amount of heat, which meant a large amount of electricity.

The present invention solves these problems,
The purpose of the present invention is to provide a heat insulator that allows the amount of heat insulating material to be checked without opening the lid.

Means for Solving the Problems In order to solve the above problems, the present invention provides a heating means to which a constant electric power is supplied, a temperature sensor for detecting the temperature of the container or the vicinity of the container, and a temperature sensor for detecting the temperature of the container or the vicinity of the container. control means for controlling the heating means to maintain the heated temperature at a constant heat retention temperature, and when the temperature detector detects a temperature lower than the heat retention temperature, the temperature reaches a predetermined temperature higher than the heat retention temperature from a predetermined temperature lower than the heat retention temperature. The device is equipped with an integrator for accumulating the elapsed time, and an insulating amount display means for displaying the amount of insulating material in the container at an arbitrary position on the outer surface of the main body or the lid according to the integrated amount of the integrator. It is something.

Effects The effects of the above configuration are as follows:
As the amount of heat insulating material changes, its heat capacity changes, so if the container is heated with a constant electric power, the predetermined 2
The amount of heat-insulating material is automatically detected by taking advantage of the fact that the elapsed time between the temperature of the container at a certain point is proportional to the amount of heat-insulating material. When the heat-insulating material is removed, the temperature of the heat-insulating material drops significantly. Then the temperature detector detects it,
The control means is operated by the output, and the heating means heats the container with constant electric power in order to maintain the container at the insulating temperature.
At this time, the container temperature rises, an integrator adds up the elapsed time between two predetermined container temperatures, and the amount of heat insulating material in the container is added to the main body or outside of the lid according to the integrated amount of this integrator. This is displayed on a heat retention amount display means provided at an arbitrary position on the surface.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

1 to 5, 21 is a main body, 22 is a bottomed cylindrical inner frame provided in the main body 21, and this inner frame 22 has a bottom heater 23 on the bottom surface and a side heater 24 on the side surface. It is set up. 25 is main body 2
A heat insulating material 26 disposed in the gap between 1 and the inner frame 22
is a cylindrical container with a bottom that is detachably housed within the inner frame 22. Reference numeral 27 denotes a lid body that is provided to cover the upper opening of the main body 21 and to be openable and closable about the rotating shaft 28 as a fulcrum. Reference numeral 29 denotes an inner lid detachably attached to the lid body 27. 30 is a temperature detector that detects the temperature of the container 26, and 31 is a control means that operates to control the bottom heater 23 and side heater 24 as heating means 32 to maintain the container 26 at a heat retention temperature (approximately 72° C.). It is. 33 is an integrator that integrates the elapsed time ta for the temperature of the container to rise between two predetermined points, for example from the temperature θ ₁ to the temperature θ ₂ , based on the output of the temperature detector 30; The heat retention amount display means 34 is provided at any position on the outer surface of the main body 21 or the lid 27. 35 is a lamp that lights up when electricity is applied.

The operation of the above configuration will be explained next.

In the normal heat-retaining state, as shown in FIG. 23. A constant power is supplied to the side heater 24) to heat the container 26, and when the temperature becomes higher than the keeping temperature θa, the power supply to the heating means 32 is stopped to keep the rice warm.

When the user opens the lid 27 for serving, the heat of the rice is released from the upper opening, and the temperature of the container 26 drops rapidly as shown in B, and θ ₁
becomes lower. Due to this temperature drop, constant power is again supplied to the heating means 32. As a result, the temperature of the container 26 begins to rise, rising from θ ₁ to θ ₂ and further to the heat retention temperature θa, and then the power supply is stopped. An integrator 33 integrates the elapsed time ta during which the temperature increases from θ ₁ to θ ₂ . This integrated amount is proportional to the amount of rice being kept warm, as shown in FIG. Therefore, the heat retention amount display means 34 displays the amount of rice according to the integrated amount. As a result, the amount of heat-retaining material can be checked from the outside at any time.

In the above embodiment, the case of using rice as the heat-retaining material was explained, but similar results can be obtained with other materials such as water.

Effects of the Invention As described above, according to the present invention, the amount of heat insulating material is detected from the change in its heat capacity, and is displayed at any position on the outer surface of the main body or the lid. This allows the user to easily check the amount of heat-insulating material from the outside without having to open the lid, which not only allows the user to check the amount of heat-insulating material from a short distance, but also saves energy because the lid does not have to be opened. This makes it very economical. In addition, the amount of heat-retaining items is detected when the lid to take out the heat-retaining items is opened, that is, when the detected temperature falls below the heat-retaining temperature, so the amount of the heat-retaining items is reliably detected after taking out the heat-retaining items. The amount can be displayed, and the user can be informed of the amount of heat-retaining material with high accuracy.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a heat insulator showing an embodiment of the present invention, Fig. 2 is a front view showing the display section of the heat insulator, Fig. 3 is a longitudinal sectional view of the same heat insulator, and Fig. 4 is the same. Figure 5 is a diagram showing the change in temperature of the container of a warmer over time. Figure 5 is a diagram showing the relationship between the elapsed time required for heating between two arbitrary temperatures and the amount of heat retention. Figure 6 is a longitudinal cross-sectional view of a conventional warmer. It is. 21... Main body, 23... Bottom heater, 24... Side heater, 26... Container, 27... Lid, 30...
... Temperature detector, 31 ... Control means, 32 ... Heating means, 33 ... Integrator, 34 ... Heat retention amount display means.

Claims (1)

[Claims] 1. A heating means to which constant electric power is supplied, a temperature detector that detects the temperature of the container or the vicinity of the container, and a control means that controls the heating means to maintain the temperature detected by the temperature sensor at a constant heat retention temperature. When the temperature sensor detects a temperature lower than the heat retention temperature, an integrator is installed to add up the elapsed time from a predetermined temperature lower than the heat retention temperature to a predetermined temperature higher than the heat retention temperature, and an integrator is installed according to the cumulative amount of this integrator. and a heat retention amount display means for displaying the amount of heat retention material in the container at an arbitrary position on the outer surface of the main body or the lid.