JP2004012023A - Heat storing tool and container having heat storing function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat storing tool that has a high heat insulating performance and is suited for heat insulation for a long time. <P>SOLUTION: The heat storing tool comprises: a magnetic adjuster alloy 2 having a Curie point; a heat insulating material 4 for covering the periphery of the magnetic adjuster alloy 2; and a metal plate 5 for airtightly covering the outside of the heat insulating material 4 to form a heat insulated space 6. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a heat storage tool, a container having a heat storage function, and a heating device for heating these, which can keep warm food or the like for a long time without cooling.
[0002]
[Prior art]
As a conventional heat storage device, Japanese Patent Application Laid-Open No. 2000-333829 discloses a heat storage device comprising a ferromagnetic material (magnetic shunt alloy) and a good heat conductor. This heat retaining tool is provided inside the heat retaining container and is covered with a heat resistant sheet. However, in the heat retaining device, the heat stored by the heat retaining device is easily radiated, and is not suitable for long-time heat retention.
[0003]
Further, Japanese Patent Application Laid-Open No. 9-65587 discloses a heat insulating container such as a thermos provided with a plug that can store heat by irradiating microwaves. However, since the heat storage portion of the plug is made of a synthetic resin material, the amount of heat storage is small and it is dangerous to overheat. In addition, the number of parts increases, heat is easily radiated to the atmosphere side, and heat insulation performance is low.
[0004]
Therefore, an object of the present invention is to provide a heat storage device having high heat insulation performance and suitable for keeping heat for a long time.
[0005]
[Means for Solving the Problems]
The present invention, as means for solving the above problems,
A magnetic shunt alloy having a Curie point;
A heat insulating material covering the periphery of the magnetic shunt alloy,
And a metal plate that airtightly covers the outside of the heat insulating material to form a heat insulating space.
[0006]
In the above invention, when the magnetic shunt alloy is heated by electromagnetic induction, the added heat is stored by the magnetic shunt alloy. The heat of the magnetic shunt alloy is slowly radiated to the atmosphere through the heat insulating space because the heat insulating space is formed outside the magnetic shunt alloy.
[0007]
It is preferable that the magnetic shunt alloy includes a heat storage body for storing heat, and the heat storage body is made of a metal or a compound thereof that melts at a predetermined temperature. Thereby, a heat storage tool having a large amount of heat storage can be obtained. It is preferable that the metal or its compound melted at the predetermined temperature is tin, bismuth, or a solder alloy. Further, the heat storage body may be an organic or inorganic compound having a latent heat storage action or a mixture thereof.
[0008]
The heat insulating material located on one side of the magnetic shunt alloy has a first thickness, and the heat insulating material located on the other side of the magnetic shunt alloy has a second thickness greater than the first thickness. It is preferred to have. Thereby, it is possible to radiate heat from one side of the heat storage tool and to minimize the heat radiation from the other side.
[0009]
Further, the heat insulating material located on one side of the magnetic shunt alloy may have high thermal conductivity, and the heat insulating material located on the other side of the magnetic shunt alloy may have low thermal conductivity. .
[0010]
By providing a metal foil for preventing heat radiation on one side of the magnetic shunt alloy, heat radiation can be reduced.
[0011]
The heat insulating space is preferably in a vacuum state.
[0012]
By providing a thermochromic substance or a thermoelectric conversion element on the outer surface of the heat storage device, the current surface temperature of the heat storage device can be determined.
[0013]
The present invention provides, as another means for solving the above problems,
A metal part having electrical resistance;
Thermal insulation covering the periphery of the metal part,
A metal plate that airtightly covers the outside of the heat insulating material to form a heat insulating space,
Voltage heating means for applying a voltage to the metal portion to heat the metal portion.
[0014]
In the above invention, when a voltage is applied to the metal part by the voltage heating means, the metal part stores heat. The heat of the metal part is slowly radiated to the atmosphere through the heat insulating space because the heat insulating space is formed outside the metal part.
[0015]
The present invention provides, as another means for solving the above problems,
A magnetic shunt alloy having a Curie point, a heat insulating material covering the periphery of the magnetic shunt alloy, and a metal plate that airtightly covers the outside of the heat insulating material to form a heat insulating space, and is provided at a bottom portion. And a side wall protruding along the edge of the bottom portion, and a housing portion for housing a housed material inside the side wall.
[0016]
In the above invention, when the magnetic shunt alloy is heated by electromagnetic induction, the added heat is stored by the magnetic shunt alloy. The heat of the magnetic shunt alloy is slowly radiated to the atmosphere through the heat insulating space because the heat insulating space is formed outside the magnetic shunt alloy. Thereby, the stored thing in a storage part can be kept warm for a long time.
[0017]
It is preferable that the magnetic shunt alloy includes a heat storage body for storing heat. Further, the heat storage body is preferably made of ceramic or aluminum. Thereby, it is possible to keep the heat for a long time and to reduce the weight.
[0018]
It is preferable that the heat storage unit is arranged in a partial region of a bottom of the container having the heat storage function. In this way, in a container having a heat storage function such as a lunch box, the food is kept warm by storing warm food in the storage part corresponding to a part of the area, and the food that the user does not want to keep warm, such as salad or fruit, is stored in the remaining area. A container having a heat storage function in a state of being accommodated in the accommodating portion corresponding to (1) can be used.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0020]
FIG. 1 shows a heat storage device 1 according to the present invention. The heat storage tool 1 includes a magnetic shunt alloy 2, a heat storage body 3, a heat insulating material 4, and a metal plate 5.
[0021]
The magnetic shunt alloy 2 has a circular plate shape and is made of, for example, a ferromagnetic material having a Curie point at a relatively low temperature of 350 ° C. The Curie point is a magnetic transition temperature at which the magnetism of a ferromagnetic material rapidly decreases. The magnetic shunt alloy 2 is an Fe-Ni-based alloy containing 30 to 40% of nickel. The magnetic shunt alloy 2 is subjected to electromagnetic induction heating by an eddy current generated when a high-frequency current is supplied to an induction heating coil 8 of a heating device 7 described later. Further, the Curie point of the magnetic shunt alloy 2 may be a value of 350 ° C. or less. This Curie point can be changed by changing the composition of the magnetic shunt alloy 2.
[0022]
The heat storage body 3 is made of, for example, a metal or a compound thereof that melts at a relatively low temperature (predetermined temperature) of tin, bismuth, or a solder alloy, and is provided integrally with the magnetic shunt alloy 2. The outside is covered with an outer frame 3a made of a metal that does not melt at the predetermined temperature.
[0023]
The heat insulating material 4 is provided so as to cover the periphery of the magnetic shunt alloy 2 and the heat storage body 3. As shown in FIG. 1, the heat insulating material 4 has a first thickness T1 at a portion 4a adjacent to the magnetic shunt alloy 2 (a portion located on one side of the magnetic shunt alloy 2), and 4b (the portion located on the other side of the magnetic shunt alloy 2) has a second thickness T2. The second thickness T2 is larger than the first thickness T1. A metal foil 9 made of, for example, copper is provided between the heat insulating material 4 and the heat storage body 3. Thereby, heat radiation of the heat storage body 3 is prevented.
[0024]
The metal plate 5 is provided so as to hermetically cover the outside of the heat insulating material 4, and a heat insulating space 6 is formed inside the metal plate 5. Further, a getter 6a is arranged inside the metal plate 5, and the heat insulating space 6 is kept in a vacuum state. In addition, the outer surface of the metal plate 5 is hermetically covered with a resin plate 5a to prevent the metal plate 5 from being deteriorated due to corrosion.
[0025]
The heat storage device 1 having the above configuration is heated using a heating device 7 as shown in FIG. This heating device 7 has an induction heating coil 8 disposed inside a main body 7a. A recess 7b is formed on the upper surface of the main body 7a so that the heat storage tool 1 can be placed on the upper surface of the main body 7a. The induction heating coil 8 is provided at a position corresponding to the bottom surface of the recess 7b.
[0026]
Next, a case where the food is kept warm using the heat storage tool 1 will be described.
[0027]
First, the user sets the heat storage device 1 in the recess 7b of the heating device 7, and then starts energizing the induction heating coil 8 of the heating device 7. When energization is started, the magnetic shunt alloy 2 of the heat storage tool 1 is heated by electromagnetic induction due to generation of an eddy current. When the magnetic shunt alloy 2 of the heat storage tool 1 reaches the Curie point, the induction heating is stopped. Thereby, the magnetic shunt alloy 2 is not overheated.
[0028]
Then, the heat storage body 3 in contact with the magnetic shunt alloy 2 also absorbs heat, and both the magnetic shunt alloy 2 and the heat storage body 3 store heat throughout.
[0029]
After the heating of the heat storage device 1 is completed, the heat storage device 1 is placed in the lunch jar 20 such that the thin side 4a of the heat insulating material 4 is in contact with the hot food material 21a as shown in FIG. 21a can be kept warm. By arranging the thick side 4b of the heat insulating material 4 so as to be in contact with the cold food 21b, the cold food 21b is insulated from the outside, so that it can be kept at a low temperature for a long time. At this time, since the heat insulating material 4 and the heat insulating space 6 are formed outside the magnetic shunt alloy 2 and the heat storage body 3, the heat stored by the magnetic shunt alloy 2 and the heat storage body 3 passes through the heat insulating space to the atmosphere side. Dissipates slowly through. Thereby, the warm food 21a can be kept warm for a long time. The magnetic shunt alloy 2 and the heat storage element 3 are covered with a thick part 4b except for the thin part 4a of the heat insulating material 4, and a metal foil 9 is provided between the heat storage element 3 and the thick part 4b of the heat insulating material 4. Therefore, the heat radiated from the magnetic shunt alloy 2 and the heat storage body 3 is mainly radiated to the warm food 21a.
[0030]
As a modified example of the embodiment, only the magnetic shunt alloy 2 may be provided inside the heat insulating material 4 without providing both the magnetic shunt alloy 2 and the heat storage body 3.
[0031]
Further, the heat storage body 3 may be an organic or inorganic compound having a latent heat storage effect or a mixture thereof. Examples of the organic compound having a latent heat storage effect include paraffin (hydrocarbon). Examples of the inorganic compound having a latent heat storage effect include silica (SiO ₂ ) and alumina (Al ₂ O ₃ ).
[0032]
Also, instead of forming a thick portion and a thin portion on the heat insulating material 4, a heat insulating material 4 having a high thermal conductivity (high thermal conductivity) is provided in place of the thin portion, and a low thermal conductivity is provided instead of the thick portion. (Low thermal conductivity) may be provided.
[0033]
Further, it is preferable that a thermochromic substance or a thermoelectric conversion element is provided on the outer surface of the heat storage device 1 so that a user can determine the current temperature of the heat storage device 1. At this time, for example, it is preferable to apply a thermal ink or the like to the outer surface of the heat storage device 1 or to attach a thermosensitive color changing rubber or the like to the outer surface of the heat storage device 1.
[0034]
As shown in FIG. 3, the heating device 7 is provided with a notifying unit 31 such as an indicator lamp, a temperature detecting unit 32 for measuring the surface temperature of the magnetic shunt alloy 2, and a control unit 33. When the means 33 determines that the surface temperature of the magnetic shunt alloy 2 has reached the predetermined temperature based on the signal from the temperature detecting means 32, it turns on the notifying means 31 to notify the user that the electromagnetic induction heating is completed. The notification may be made.
[0035]
In addition, a power measuring means (not shown) for measuring the electromotive force generated in the magnetic shunt alloy 2 is provided in place of the temperature detecting means 32, and the electromotive force generated in the magnetic shunt alloy 2 of the heat storage tool 1 during electromagnetic induction heating is a predetermined value. It may be determined that the electromagnetic induction heating is completed when the power value is reached, or when the temperature of the magnetic shunt alloy 2 becomes equal to or higher than the Curie point and the electromagnetic induction is stopped.
[0036]
Further, as shown in FIGS. 4A and 4B, the heat storage tool 1 may have a rectangular box shape. A notifying means 31 is provided below the main body 7a of the heating device 7, and a notch 7c is formed in a side wall of the main body 7a. The heat storage tool 1 is held by grasping the side wall of the heat storage tool 1 with a finger. It is easy to take out. The induction heating coil 8 of the heating device 7 is provided inside the side wall of the heating device 7 as shown in FIG.
[0037]
As shown in FIG. 5, the heat storage tool 1 ′ includes a metal part 2 ′ having electric resistance instead of the magnetic shunt metal 2, and a power plug for applying a voltage to the metal part 2 ′ to heat the metal part 2 ′. 41 (voltage heating means) may be provided. The metal part 2 'of the heat storage tool 1' is heated by connecting the power plug 41 to an outlet and supplying electricity to the metal part 2 '. This makes the heating device 7 unnecessary.
[0038]
Next, a container 50 having a heat storage function according to the present invention will be described. Parts similar to those of the heat storage tool 1 are denoted by the same reference numerals, and detailed description is omitted.
[0039]
As shown in FIG. 6, the bottom of the container 50 having the heat storage function is composed of a heat storage unit 51 including the magnetic shunt alloy 2, the heat insulating material 4, and the metal plate 5, and the bottom of the container 50 having the heat storage function. The side wall 52 protrudes along the edge of the side wall 52, and a storage portion 53 for storing a storage object is formed inside the side wall 52. In addition, the magnetic shunt alloy 2 includes a heat storage body 3 for storing heat.
[0040]
The heat insulating material 4 is composed of a thin heat insulating material 4a located on the bottom side of the housing 53 and a thick heat insulating material 4b located on the bottom side of the container 50 having a heat storage function.
[0041]
As shown in FIG. 6, the container 50 having the heat storage function having the above-described configuration is heated using a heating device 7 ′. The heating device 7 'has an induction heating coil 8 disposed inside a main body 7a, similarly to the heating device 7. A recess 7b is formed on the upper surface of the main body 7a so that the container 50 having a heat storage function can be placed on the upper surface of the main body 7a. The induction heating coil 8 is provided at a position corresponding to the bottom surface of the recess 7b.
[0042]
After setting the container 50 having the heat storage function in the heating device 7, the induction heating coil 8 is energized to heat the magnetic shunt alloy 2 of the container 50 having the heat storage function by electromagnetic induction. After the heating of the container 50 having the heat storage function is completed, the warm food is stored for a long time by storing the warm food inside the storage portion 53 of the container 50 having the heat storage function.
[0043]
The heat storage body 3 may be made of ceramic or aluminum. Thereby, weight reduction can be achieved.
[0044]
A modified example of the container 50 having the heat storage function will be described. As shown in FIG. 7, the heat storage unit 51 of a tray-type container 50 ′ having a heat storage function such as a lunch box is arranged in a partial region of the bottom of the container 50 ′ having a heat storage function. Thus, the warm food 21a can be kept warm by storing the warm food 21a inside the housing portion 53a. In addition, by storing the cold food 21b inside the storage portion 53b, the cold food 21b can be kept in a low temperature state for a long time.
[0045]
【The invention's effect】
As is apparent from the above description, according to the present invention, a magnetic shunt alloy having a Curie point, a heat insulating material covering the periphery of the magnetic shunt alloy, and a metal that airtightly covers the outside of the heat insulating material to form a heat insulating space The magnetic shunt alloy is composed of a plate, and the magnetic shunt alloy is provided with a heat storage body for storing heat. Therefore, the heat of the magnetic shunt alloy and the heat storage body slowly radiates to the atmosphere via the heat insulating space. This makes it possible to provide a heat storage tool that can keep food and the like at a desired temperature for a long time.
[Brief description of the drawings]
FIG. 1 is a sectional view of a heat storage device and a heating device according to the present invention.
FIG. 2 is a cross-sectional view showing a state where the heat storage device of FIG. 1 is housed in a lunch jar.
FIG. 3 is a sectional view showing a modified example of the heat storage device of the present invention and the heating device of FIG. 1;
FIG. 4A is a perspective view showing a modification of the heat storage device and the heating device of FIG. 1; (B) is a sectional view of (a).
FIG. 5 is a sectional view showing a modification of the heat storage tool of the present invention.
FIG. 6 is a sectional view of a container having a heat storage function and a heating device according to the present invention.
7 is a cross-sectional view showing a modified example of the container having a heat storage function of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Heat storage tool 2 ... Magnetic shunt alloy 3 ... Heat storage body 4 ... Heat insulation material 5 ... Metal plate 6 ... Heat insulation space

Claims (12)

A magnetic shunt alloy having a Curie point;
A heat insulating material covering the periphery of the magnetic shunt alloy,
A heat storage tool comprising: a metal plate that airtightly covers the outside of the heat insulating material to form a heat insulating space. The heat storage device according to claim 1, wherein the magnetic shunt alloy includes a heat storage body for storing heat. The heat storage device according to claim 2, wherein the heat storage body is made of a metal or a compound thereof that melts at a predetermined temperature. The heat insulating material located on one side of the magnetic shunt alloy has a first thickness, and the heat insulating material located on the other side of the magnetic shunt alloy has a second thickness greater than the first thickness. The heat storage device according to any one of claims 1 to 3, wherein the heat storage device has: 2. The heat insulating material located on one side of the magnetic shunt alloy has a high thermal conductivity, and the heat insulating material located on the other side of the magnetic shunt alloy has a low thermal conductivity. 5. The heat storage device according to any one of items 1 to 4. The heat storage tool according to any one of claims 1 to 5, wherein a metal foil for preventing heat radiation is provided on one side of the magnetic shunt alloy. The heat storage tool according to any one of claims 1 to 6, wherein the heat insulating space is in a vacuum state. The heat storage device according to any one of claims 1 to 7, wherein a thermochromic substance or a thermoelectric conversion element is provided on an outer surface of the heat storage device. A metal part having electrical resistance;
Thermal insulation covering the periphery of the metal part,
A metal plate that airtightly covers the outside of the heat insulating material to form a heat insulating space,
A heat storage device comprising voltage heating means for applying a voltage to the metal portion to heat the metal portion. A magnetic shunt alloy having a Curie point, a heat insulating material covering the periphery of the magnetic shunt alloy, and a metal plate that air-tightly covers the outside of the heat insulating material to form a heat insulating space, and is provided at a bottom portion. And a side wall protruding along the edge of the bottom portion, and a storage portion for storing a storage object inside the side wall, the container having a heat storage function. The container having a heat storage function according to claim 10, wherein the magnetic shunt alloy includes a heat storage body for storing heat. The container having a heat storage function according to claim 10, wherein the heat storage portion is arranged in a partial region of a bottom portion of the container having the heat storage function.

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